sound/core/oss/pcm_oss.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Digital Audio (PCM) abstract layer / OSS compatible
   4  *  Copyright (c) by Jaroslav Kysela <[email protected]>
   5  */
   6
   7 #if 0
   8 #define PLUGIN_DEBUG
   9 #endif
  10 #if 0
  11 #define OSS_DEBUG
  12 #endif
  13
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched/signal.h>
  17 #include <linux/time.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/module.h>
  20 #include <linux/math64.h>
  21 #include <linux/string.h>
  22 #include <linux/compat.h>
  23 #include <sound/core.h>
  24 #include <sound/minors.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include "pcm_plugin.h"
  28 #include <sound/info.h>
  29 #include <linux/soundcard.h>
  30 #include <sound/initval.h>
  31 #include <sound/mixer_oss.h>
  32
  33 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
  34
  35 static int dsp_map[SNDRV_CARDS];
  36 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  37 static bool nonblock_open = 1;
  38
  39 MODULE_AUTHOR("Jaroslav Kysela <[email protected]>, Abramo Bagnara <[email protected]>");
  40 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
  41 MODULE_LICENSE("GPL");
  42 module_param_array(dsp_map, int, NULL, 0444);
  43 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
  44 module_param_array(adsp_map, int, NULL, 0444);
  45 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
  46 module_param(nonblock_open, bool, 0644);
  47 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
  48 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
  49 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
  50
  51 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
  52 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
  53 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
  54
  55 /*
  56  * helper functions to process hw_params
  57  */
  58 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
  59 {
  60         int changed = 0;
  61         if (i->min < min) {
  62                 i->min = min;
  63                 i->openmin = openmin;
  64                 changed = 1;
  65         } else if (i->min == min && !i->openmin && openmin) {
  66                 i->openmin = 1;
  67                 changed = 1;
  68         }
  69         if (i->integer) {
  70                 if (i->openmin) {
  71                         i->min++;
  72                         i->openmin = 0;
  73                 }
  74         }
  75         if (snd_interval_checkempty(i)) {
  76                 snd_interval_none(i);
  77                 return -EINVAL;
  78         }
  79         return changed;
  80 }
  81
  82 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
  83 {
  84         int changed = 0;
  85         if (i->max > max) {
  86                 i->max = max;
  87                 i->openmax = openmax;
  88                 changed = 1;
  89         } else if (i->max == max && !i->openmax && openmax) {
  90                 i->openmax = 1;
  91                 changed = 1;
  92         }
  93         if (i->integer) {
  94                 if (i->openmax) {
  95                         i->max--;
  96                         i->openmax = 0;
  97                 }
  98         }
  99         if (snd_interval_checkempty(i)) {
 100                 snd_interval_none(i);
 101                 return -EINVAL;
 102         }
 103         return changed;
 104 }
 105
 106 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
 107 {
 108         struct snd_interval t;
 109         t.empty = 0;
 110         t.min = t.max = val;
 111         t.openmin = t.openmax = 0;
 112         t.integer = 1;
 113         return snd_interval_refine(i, &t);
 114 }
 115
 116 /**
 117  * snd_pcm_hw_param_value_min
 118  * @params: the hw_params instance
 119  * @var: parameter to retrieve
 120  * @dir: pointer to the direction (-1,0,1) or NULL
 121  *
 122  * Return the minimum value for field PAR.
 123  */
 124 static unsigned int
 125 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
 126                            snd_pcm_hw_param_t var, int *dir)
 127 {
 128         if (hw_is_mask(var)) {
 129                 if (dir)
 130                         *dir = 0;
 131                 return snd_mask_min(hw_param_mask_c(params, var));
 132         }
 133         if (hw_is_interval(var)) {
 134                 const struct snd_interval *i = hw_param_interval_c(params, var);
 135                 if (dir)
 136                         *dir = i->openmin;
 137                 return snd_interval_min(i);
 138         }
 139         return -EINVAL;
 140 }
 141
 142 /**
 143  * snd_pcm_hw_param_value_max
 144  * @params: the hw_params instance
 145  * @var: parameter to retrieve
 146  * @dir: pointer to the direction (-1,0,1) or NULL
 147  *
 148  * Return the maximum value for field PAR.
 149  */
 150 static unsigned int
 151 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
 152                            snd_pcm_hw_param_t var, int *dir)
 153 {
 154         if (hw_is_mask(var)) {
 155                 if (dir)
 156                         *dir = 0;
 157                 return snd_mask_max(hw_param_mask_c(params, var));
 158         }
 159         if (hw_is_interval(var)) {
 160                 const struct snd_interval *i = hw_param_interval_c(params, var);
 161                 if (dir)
 162                         *dir = - (int) i->openmax;
 163                 return snd_interval_max(i);
 164         }
 165         return -EINVAL;
 166 }
 167
 168 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
 169                                   snd_pcm_hw_param_t var,
 170                                   const struct snd_mask *val)
 171 {
 172         int changed;
 173         changed = snd_mask_refine(hw_param_mask(params, var), val);
 174         if (changed > 0) {
 175                 params->cmask |= 1 << var;
 176                 params->rmask |= 1 << var;
 177         }
 178         return changed;
 179 }
 180
 181 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
 182                                  struct snd_pcm_hw_params *params,
 183                                  snd_pcm_hw_param_t var,
 184                                  const struct snd_mask *val)
 185 {
 186         int changed = _snd_pcm_hw_param_mask(params, var, val);
 187         if (changed < 0)
 188                 return changed;
 189         if (params->rmask) {
 190                 int err = snd_pcm_hw_refine(pcm, params);
 191                 if (err < 0)
 192                         return err;
 193         }
 194         return 0;
 195 }
 196
 197 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
 198                                  snd_pcm_hw_param_t var, unsigned int val,
 199                                  int dir)
 200 {
 201         int changed;
 202         int open = 0;
 203         if (dir) {
 204                 if (dir > 0) {
 205                         open = 1;
 206                 } else if (dir < 0) {
 207                         if (val > 0) {
 208                                 open = 1;
 209                                 val--;
 210                         }
 211                 }
 212         }
 213         if (hw_is_mask(var))
 214                 changed = snd_mask_refine_min(hw_param_mask(params, var),
 215                                               val + !!open);
 216         else if (hw_is_interval(var))
 217                 changed = snd_interval_refine_min(hw_param_interval(params, var),
 218                                                   val, open);
 219         else
 220                 return -EINVAL;
 221         if (changed > 0) {
 222                 params->cmask |= 1 << var;
 223                 params->rmask |= 1 << var;
 224         }
 225         return changed;
 226 }
 227
 228 /**
 229  * snd_pcm_hw_param_min
 230  * @pcm: PCM instance
 231  * @params: the hw_params instance
 232  * @var: parameter to retrieve
 233  * @val: minimal value
 234  * @dir: pointer to the direction (-1,0,1) or NULL
 235  *
 236  * Inside configuration space defined by PARAMS remove from PAR all
 237  * values < VAL. Reduce configuration space accordingly.
 238  * Return new minimum or -EINVAL if the configuration space is empty
 239  */
 240 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
 241                                 struct snd_pcm_hw_params *params,
 242                                 snd_pcm_hw_param_t var, unsigned int val,
 243                                 int *dir)
 244 {
 245         int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
 246         if (changed < 0)
 247                 return changed;
 248         if (params->rmask) {
 249                 int err = snd_pcm_hw_refine(pcm, params);
 250                 if (err < 0)
 251                         return err;
 252         }
 253         return snd_pcm_hw_param_value_min(params, var, dir);
 254 }
 255
 256 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
 257                                  snd_pcm_hw_param_t var, unsigned int val,
 258                                  int dir)
 259 {
 260         int changed;
 261         int open = 0;
 262         if (dir) {
 263                 if (dir < 0) {
 264                         open = 1;
 265                 } else if (dir > 0) {
 266                         open = 1;
 267                         val++;
 268                 }
 269         }
 270         if (hw_is_mask(var)) {
 271                 if (val == 0 && open) {
 272                         snd_mask_none(hw_param_mask(params, var));
 273                         changed = -EINVAL;
 274                 } else
 275                         changed = snd_mask_refine_max(hw_param_mask(params, var),
 276                                                       val - !!open);
 277         } else if (hw_is_interval(var))
 278                 changed = snd_interval_refine_max(hw_param_interval(params, var),
 279                                                   val, open);
 280         else
 281                 return -EINVAL;
 282         if (changed > 0) {
 283                 params->cmask |= 1 << var;
 284                 params->rmask |= 1 << var;
 285         }
 286         return changed;
 287 }
 288
 289 /**
 290  * snd_pcm_hw_param_max
 291  * @pcm: PCM instance
 292  * @params: the hw_params instance
 293  * @var: parameter to retrieve
 294  * @val: maximal value
 295  * @dir: pointer to the direction (-1,0,1) or NULL
 296  *
 297  * Inside configuration space defined by PARAMS remove from PAR all
 298  *  values >= VAL + 1. Reduce configuration space accordingly.
 299  *  Return new maximum or -EINVAL if the configuration space is empty
 300  */
 301 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
 302                                 struct snd_pcm_hw_params *params,
 303                                 snd_pcm_hw_param_t var, unsigned int val,
 304                                 int *dir)
 305 {
 306         int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
 307         if (changed < 0)
 308                 return changed;
 309         if (params->rmask) {
 310                 int err = snd_pcm_hw_refine(pcm, params);
 311                 if (err < 0)
 312                         return err;
 313         }
 314         return snd_pcm_hw_param_value_max(params, var, dir);
 315 }
 316
 317 static int boundary_sub(int a, int adir,
 318                         int b, int bdir,
 319                         int *c, int *cdir)
 320 {
 321         adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
 322         bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
 323         *c = a - b;
 324         *cdir = adir - bdir;
 325         if (*cdir == -2) {
 326                 (*c)--;
 327         } else if (*cdir == 2) {
 328                 (*c)++;
 329         }
 330         return 0;
 331 }
 332
 333 static int boundary_lt(unsigned int a, int adir,
 334                        unsigned int b, int bdir)
 335 {
 336         if (adir < 0) {
 337                 a--;
 338                 adir = 1;
 339         } else if (adir > 0)
 340                 adir = 1;
 341         if (bdir < 0) {
 342                 b--;
 343                 bdir = 1;
 344         } else if (bdir > 0)
 345                 bdir = 1;
 346         return a < b || (a == b && adir < bdir);
 347 }
 348
 349 /* Return 1 if min is nearer to best than max */
 350 static int boundary_nearer(int min, int mindir,
 351                            int best, int bestdir,
 352                            int max, int maxdir)
 353 {
 354         int dmin, dmindir;
 355         int dmax, dmaxdir;
 356         boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
 357         boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
 358         return boundary_lt(dmin, dmindir, dmax, dmaxdir);
 359 }
 360
 361 /**
 362  * snd_pcm_hw_param_near
 363  * @pcm: PCM instance
 364  * @params: the hw_params instance
 365  * @var: parameter to retrieve
 366  * @best: value to set
 367  * @dir: pointer to the direction (-1,0,1) or NULL
 368  *
 369  * Inside configuration space defined by PARAMS set PAR to the available value
 370  * nearest to VAL. Reduce configuration space accordingly.
 371  * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
 372  * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
 373  * Return the value found.
 374   */
 375 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
 376                                  struct snd_pcm_hw_params *params,
 377                                  snd_pcm_hw_param_t var, unsigned int best,
 378                                  int *dir)
 379 {
 380         struct snd_pcm_hw_params *save = NULL;
 381         int v;
 382         unsigned int saved_min;
 383         int last = 0;
 384         int min, max;
 385         int mindir, maxdir;
 386         int valdir = dir ? *dir : 0;
 387         /* FIXME */
 388         if (best > INT_MAX)
 389                 best = INT_MAX;
 390         min = max = best;
 391         mindir = maxdir = valdir;
 392         if (maxdir > 0)
 393                 maxdir = 0;
 394         else if (maxdir == 0)
 395                 maxdir = -1;
 396         else {
 397                 maxdir = 1;
 398                 max--;
 399         }
 400         save = kmalloc(sizeof(*save), GFP_KERNEL);
 401         if (save == NULL)
 402                 return -ENOMEM;
 403         *save = *params;
 404         saved_min = min;
 405         min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
 406         if (min >= 0) {
 407                 struct snd_pcm_hw_params *params1;
 408                 if (max < 0)
 409                         goto _end;
 410                 if ((unsigned int)min == saved_min && mindir == valdir)
 411                         goto _end;
 412                 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
 413                 if (params1 == NULL) {
 414                         kfree(save);
 415                         return -ENOMEM;
 416                 }
 417                 *params1 = *save;
 418                 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
 419                 if (max < 0) {
 420                         kfree(params1);
 421                         goto _end;
 422                 }
 423                 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
 424                         *params = *params1;
 425                         last = 1;
 426                 }
 427                 kfree(params1);
 428         } else {
 429                 *params = *save;
 430                 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
 431                 if (max < 0) {
 432                         kfree(save);
 433                         return max;
 434                 }
 435                 last = 1;
 436         }
 437  _end:
 438         kfree(save);
 439         if (last)
 440                 v = snd_pcm_hw_param_last(pcm, params, var, dir);
 441         else
 442                 v = snd_pcm_hw_param_first(pcm, params, var, dir);
 443         return v;
 444 }
 445
 446 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
 447                                  snd_pcm_hw_param_t var, unsigned int val,
 448                                  int dir)
 449 {
 450         int changed;
 451         if (hw_is_mask(var)) {
 452                 struct snd_mask *m = hw_param_mask(params, var);
 453                 if (val == 0 && dir < 0) {
 454                         changed = -EINVAL;
 455                         snd_mask_none(m);
 456                 } else {
 457                         if (dir > 0)
 458                                 val++;
 459                         else if (dir < 0)
 460                                 val--;
 461                         changed = snd_mask_refine_set(hw_param_mask(params, var), val);
 462                 }
 463         } else if (hw_is_interval(var)) {
 464                 struct snd_interval *i = hw_param_interval(params, var);
 465                 if (val == 0 && dir < 0) {
 466                         changed = -EINVAL;
 467                         snd_interval_none(i);
 468                 } else if (dir == 0)
 469                         changed = snd_interval_refine_set(i, val);
 470                 else {
 471                         struct snd_interval t;
 472                         t.openmin = 1;
 473                         t.openmax = 1;
 474                         t.empty = 0;
 475                         t.integer = 0;
 476                         if (dir < 0) {
 477                                 t.min = val - 1;
 478                                 t.max = val;
 479                         } else {
 480                                 t.min = val;
 481                                 t.max = val+1;
 482                         }
 483                         changed = snd_interval_refine(i, &t);
 484                 }
 485         } else
 486                 return -EINVAL;
 487         if (changed > 0) {
 488                 params->cmask |= 1 << var;
 489                 params->rmask |= 1 << var;
 490         }
 491         return changed;
 492 }
 493
 494 /**
 495  * snd_pcm_hw_param_set
 496  * @pcm: PCM instance
 497  * @params: the hw_params instance
 498  * @var: parameter to retrieve
 499  * @val: value to set
 500  * @dir: pointer to the direction (-1,0,1) or NULL
 501  *
 502  * Inside configuration space defined by PARAMS remove from PAR all
 503  * values != VAL. Reduce configuration space accordingly.
 504  *  Return VAL or -EINVAL if the configuration space is empty
 505  */
 506 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
 507                                 struct snd_pcm_hw_params *params,
 508                                 snd_pcm_hw_param_t var, unsigned int val,
 509                                 int dir)
 510 {
 511         int changed = _snd_pcm_hw_param_set(params, var, val, dir);
 512         if (changed < 0)
 513                 return changed;
 514         if (params->rmask) {
 515                 int err = snd_pcm_hw_refine(pcm, params);
 516                 if (err < 0)
 517                         return err;
 518         }
 519         return snd_pcm_hw_param_value(params, var, NULL);
 520 }
 521
 522 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
 523                                         snd_pcm_hw_param_t var)
 524 {
 525         int changed;
 526         changed = snd_interval_setinteger(hw_param_interval(params, var));
 527         if (changed > 0) {
 528                 params->cmask |= 1 << var;
 529                 params->rmask |= 1 << var;
 530         }
 531         return changed;
 532 }
 533
 534 /*
 535  * plugin
 536  */
 537
 538 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 539 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
 540 {
 541         struct snd_pcm_runtime *runtime = substream->runtime;
 542         struct snd_pcm_plugin *plugin, *next;
 543
 544         plugin = runtime->oss.plugin_first;
 545         while (plugin) {
 546                 next = plugin->next;
 547                 snd_pcm_plugin_free(plugin);
 548                 plugin = next;
 549         }
 550         runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
 551         return 0;
 552 }
 553
 554 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
 555 {
 556         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 557         plugin->next = runtime->oss.plugin_first;
 558         plugin->prev = NULL;
 559         if (runtime->oss.plugin_first) {
 560                 runtime->oss.plugin_first->prev = plugin;
 561                 runtime->oss.plugin_first = plugin;
 562         } else {
 563                 runtime->oss.plugin_last =
 564                 runtime->oss.plugin_first = plugin;
 565         }
 566         return 0;
 567 }
 568
 569 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
 570 {
 571         struct snd_pcm_runtime *runtime = plugin->plug->runtime;
 572         plugin->next = NULL;
 573         plugin->prev = runtime->oss.plugin_last;
 574         if (runtime->oss.plugin_last) {
 575                 runtime->oss.plugin_last->next = plugin;
 576                 runtime->oss.plugin_last = plugin;
 577         } else {
 578                 runtime->oss.plugin_last =
 579                 runtime->oss.plugin_first = plugin;
 580         }
 581         return 0;
 582 }
 583 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
 584
 585 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
 586 {
 587         struct snd_pcm_runtime *runtime = substream->runtime;
 588         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 589         long bytes = frames_to_bytes(runtime, frames);
 590         if (buffer_size == runtime->oss.buffer_bytes)
 591                 return bytes;
 592 #if BITS_PER_LONG >= 64
 593         return runtime->oss.buffer_bytes * bytes / buffer_size;
 594 #else
 595         {
 596                 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
 597                 return div_u64(bsize, buffer_size);
 598         }
 599 #endif
 600 }
 601
 602 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 603 {
 604         struct snd_pcm_runtime *runtime = substream->runtime;
 605         long buffer_size = snd_pcm_lib_buffer_bytes(substream);
 606         if (buffer_size == runtime->oss.buffer_bytes)
 607                 return bytes_to_frames(runtime, bytes);
 608         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
 609 }
 610
 611 static inline
 612 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
 613 {
 614         return runtime->hw_ptr_interrupt;
 615 }
 616
 617 /* define extended formats in the recent OSS versions (if any) */
 618 /* linear formats */
 619 #define AFMT_S32_LE      0x00001000
 620 #define AFMT_S32_BE      0x00002000
 621 #define AFMT_S24_LE      0x00008000
 622 #define AFMT_S24_BE      0x00010000
 623 #define AFMT_S24_PACKED  0x00040000
 624
 625 /* other supported formats */
 626 #define AFMT_FLOAT       0x00004000
 627 #define AFMT_SPDIF_RAW   0x00020000
 628
 629 /* unsupported formats */
 630 #define AFMT_AC3         0x00000400
 631 #define AFMT_VORBIS      0x00000800
 632
 633 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
 634 {
 635         switch (format) {
 636         case AFMT_MU_LAW:       return SNDRV_PCM_FORMAT_MU_LAW;
 637         case AFMT_A_LAW:        return SNDRV_PCM_FORMAT_A_LAW;
 638         case AFMT_IMA_ADPCM:    return SNDRV_PCM_FORMAT_IMA_ADPCM;
 639         case AFMT_U8:           return SNDRV_PCM_FORMAT_U8;
 640         case AFMT_S16_LE:       return SNDRV_PCM_FORMAT_S16_LE;
 641         case AFMT_S16_BE:       return SNDRV_PCM_FORMAT_S16_BE;
 642         case AFMT_S8:           return SNDRV_PCM_FORMAT_S8;
 643         case AFMT_U16_LE:       return SNDRV_PCM_FORMAT_U16_LE;
 644         case AFMT_U16_BE:       return SNDRV_PCM_FORMAT_U16_BE;
 645         case AFMT_MPEG:         return SNDRV_PCM_FORMAT_MPEG;
 646         case AFMT_S32_LE:       return SNDRV_PCM_FORMAT_S32_LE;
 647         case AFMT_S32_BE:       return SNDRV_PCM_FORMAT_S32_BE;
 648         case AFMT_S24_LE:       return SNDRV_PCM_FORMAT_S24_LE;
 649         case AFMT_S24_BE:       return SNDRV_PCM_FORMAT_S24_BE;
 650         case AFMT_S24_PACKED:   return SNDRV_PCM_FORMAT_S24_3LE;
 651         case AFMT_FLOAT:        return SNDRV_PCM_FORMAT_FLOAT;
 652         case AFMT_SPDIF_RAW:    return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
 653         default:                return SNDRV_PCM_FORMAT_U8;
 654         }
 655 }
 656
 657 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
 658 {
 659         switch (format) {
 660         case SNDRV_PCM_FORMAT_MU_LAW:   return AFMT_MU_LAW;
 661         case SNDRV_PCM_FORMAT_A_LAW:    return AFMT_A_LAW;
 662         case SNDRV_PCM_FORMAT_IMA_ADPCM:        return AFMT_IMA_ADPCM;
 663         case SNDRV_PCM_FORMAT_U8:               return AFMT_U8;
 664         case SNDRV_PCM_FORMAT_S16_LE:   return AFMT_S16_LE;
 665         case SNDRV_PCM_FORMAT_S16_BE:   return AFMT_S16_BE;
 666         case SNDRV_PCM_FORMAT_S8:               return AFMT_S8;
 667         case SNDRV_PCM_FORMAT_U16_LE:   return AFMT_U16_LE;
 668         case SNDRV_PCM_FORMAT_U16_BE:   return AFMT_U16_BE;
 669         case SNDRV_PCM_FORMAT_MPEG:             return AFMT_MPEG;
 670         case SNDRV_PCM_FORMAT_S32_LE:   return AFMT_S32_LE;
 671         case SNDRV_PCM_FORMAT_S32_BE:   return AFMT_S32_BE;
 672         case SNDRV_PCM_FORMAT_S24_LE:   return AFMT_S24_LE;
 673         case SNDRV_PCM_FORMAT_S24_BE:   return AFMT_S24_BE;
 674         case SNDRV_PCM_FORMAT_S24_3LE:  return AFMT_S24_PACKED;
 675         case SNDRV_PCM_FORMAT_FLOAT:    return AFMT_FLOAT;
 676         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
 677         default:                        return -EINVAL;
 678         }
 679 }
 680
 681 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
 682                                    struct snd_pcm_hw_params *oss_params,
 683                                    struct snd_pcm_hw_params *slave_params)
 684 {
 685         size_t s;
 686         size_t oss_buffer_size, oss_period_size, oss_periods;
 687         size_t min_period_size, max_period_size;
 688         struct snd_pcm_runtime *runtime = substream->runtime;
 689         size_t oss_frame_size;
 690
 691         oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
 692                          params_channels(oss_params) / 8;
 693
 694         oss_buffer_size = snd_pcm_plug_client_size(substream,
 695                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
 696         if (!oss_buffer_size)
 697                 return -EINVAL;
 698         oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
 699         if (atomic_read(&substream->mmap_count)) {
 700                 if (oss_buffer_size > runtime->oss.mmap_bytes)
 701                         oss_buffer_size = runtime->oss.mmap_bytes;
 702         }
 703
 704         if (substream->oss.setup.period_size > 16)
 705                 oss_period_size = substream->oss.setup.period_size;
 706         else if (runtime->oss.fragshift) {
 707                 oss_period_size = 1 << runtime->oss.fragshift;
 708                 if (oss_period_size > oss_buffer_size / 2)
 709                         oss_period_size = oss_buffer_size / 2;
 710         } else {
 711                 int sd;
 712                 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
 713
 714                 oss_period_size = oss_buffer_size;
 715                 do {
 716                         oss_period_size /= 2;
 717                 } while (oss_period_size > bytes_per_sec);
 718                 if (runtime->oss.subdivision == 0) {
 719                         sd = 4;
 720                         if (oss_period_size / sd > 4096)
 721                                 sd *= 2;
 722                         if (oss_period_size / sd < 4096)
 723                                 sd = 1;
 724                 } else
 725                         sd = runtime->oss.subdivision;
 726                 oss_period_size /= sd;
 727                 if (oss_period_size < 16)
 728                         oss_period_size = 16;
 729         }
 730
 731         min_period_size = snd_pcm_plug_client_size(substream,
 732                                                    snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 733         if (min_period_size) {
 734                 min_period_size *= oss_frame_size;
 735                 min_period_size = roundup_pow_of_two(min_period_size);
 736                 if (oss_period_size < min_period_size)
 737                         oss_period_size = min_period_size;
 738         }
 739
 740         max_period_size = snd_pcm_plug_client_size(substream,
 741                                                    snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
 742         if (max_period_size) {
 743                 max_period_size *= oss_frame_size;
 744                 max_period_size = rounddown_pow_of_two(max_period_size);
 745                 if (oss_period_size > max_period_size)
 746                         oss_period_size = max_period_size;
 747         }
 748
 749         oss_periods = oss_buffer_size / oss_period_size;
 750
 751         if (substream->oss.setup.periods > 1)
 752                 oss_periods = substream->oss.setup.periods;
 753
 754         s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 755         if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
 756                 s = runtime->oss.maxfrags;
 757         if (oss_periods > s)
 758                 oss_periods = s;
 759
 760         s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
 761         if (s < 2)
 762                 s = 2;
 763         if (oss_periods < s)
 764                 oss_periods = s;
 765
 766         while (oss_period_size * oss_periods > oss_buffer_size)
 767                 oss_period_size /= 2;
 768
 769         if (oss_period_size < 16)
 770                 return -EINVAL;
 771         runtime->oss.period_bytes = oss_period_size;
 772         runtime->oss.period_frames = 1;
 773         runtime->oss.periods = oss_periods;
 774         return 0;
 775 }
 776
 777 static int choose_rate(struct snd_pcm_substream *substream,
 778                        struct snd_pcm_hw_params *params, unsigned int best_rate)
 779 {
 780         const struct snd_interval *it;
 781         struct snd_pcm_hw_params *save;
 782         unsigned int rate, prev;
 783
 784         save = kmalloc(sizeof(*save), GFP_KERNEL);
 785         if (save == NULL)
 786                 return -ENOMEM;
 787         *save = *params;
 788         it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
 789
 790         /* try multiples of the best rate */
 791         rate = best_rate;
 792         for (;;) {
 793                 if (it->max < rate || (it->max == rate && it->openmax))
 794                         break;
 795                 if (it->min < rate || (it->min == rate && !it->openmin)) {
 796                         int ret;
 797                         ret = snd_pcm_hw_param_set(substream, params,
 798                                                    SNDRV_PCM_HW_PARAM_RATE,
 799                                                    rate, 0);
 800                         if (ret == (int)rate) {
 801                                 kfree(save);
 802                                 return rate;
 803                         }
 804                         *params = *save;
 805                 }
 806                 prev = rate;
 807                 rate += best_rate;
 808                 if (rate <= prev)
 809                         break;
 810         }
 811
 812         /* not found, use the nearest rate */
 813         kfree(save);
 814         return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
 815 }
 816
 817 /* parameter locking: returns immediately if tried during streaming */
 818 static int lock_params(struct snd_pcm_runtime *runtime)
 819 {
 820         if (mutex_lock_interruptible(&runtime->oss.params_lock))
 821                 return -ERESTARTSYS;
 822         if (atomic_read(&runtime->oss.rw_ref)) {
 823                 mutex_unlock(&runtime->oss.params_lock);
 824                 return -EBUSY;
 825         }
 826         return 0;
 827 }
 828
 829 static void unlock_params(struct snd_pcm_runtime *runtime)
 830 {
 831         mutex_unlock(&runtime->oss.params_lock);
 832 }
 833
 834 /* call with params_lock held */
 835 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
 836 {
 837         struct snd_pcm_runtime *runtime = substream->runtime;
 838         struct snd_pcm_hw_params *params, *sparams;
 839         struct snd_pcm_sw_params *sw_params;
 840         ssize_t oss_buffer_size, oss_period_size;
 841         size_t oss_frame_size;
 842         int err;
 843         int direct;
 844         snd_pcm_format_t format, sformat;
 845         int n;
 846         const struct snd_mask *sformat_mask;
 847         struct snd_mask mask;
 848
 849         if (!runtime->oss.params)
 850                 return 0;
 851         sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
 852         params = kmalloc(sizeof(*params), GFP_KERNEL);
 853         sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
 854         if (!sw_params || !params || !sparams) {
 855                 err = -ENOMEM;
 856                 goto failure;
 857         }
 858
 859         if (atomic_read(&substream->mmap_count))
 860                 direct = 1;
 861         else
 862                 direct = substream->oss.setup.direct;
 863
 864         _snd_pcm_hw_params_any(sparams);
 865         _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
 866         _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
 867         snd_mask_none(&mask);
 868         if (atomic_read(&substream->mmap_count))
 869                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
 870         else {
 871                 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
 872                 if (!direct)
 873                         snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
 874         }
 875         err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
 876         if (err < 0) {
 877                 pcm_dbg(substream->pcm, "No usable accesses\n");
 878                 err = -EINVAL;
 879                 goto failure;
 880         }
 881         choose_rate(substream, sparams, runtime->oss.rate);
 882         snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
 883
 884         format = snd_pcm_oss_format_from(runtime->oss.format);
 885
 886         sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
 887         if (direct)
 888                 sformat = format;
 889         else
 890                 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
 891
 892         if ((__force int)sformat < 0 ||
 893             !snd_mask_test_format(sformat_mask, sformat)) {
 894                 pcm_for_each_format(sformat) {
 895                         if (snd_mask_test_format(sformat_mask, sformat) &&
 896                             snd_pcm_oss_format_to(sformat) >= 0)
 897                                 goto format_found;
 898                 }
 899                 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
 900                 err = -EINVAL;
 901                 goto failure;
 902         }
 903  format_found:
 904         err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
 905         if (err < 0)
 906                 goto failure;
 907
 908         if (direct) {
 909                 memcpy(params, sparams, sizeof(*params));
 910         } else {
 911                 _snd_pcm_hw_params_any(params);
 912                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
 913                                       (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
 914                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
 915                                       (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
 916                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
 917                                       runtime->oss.channels, 0);
 918                 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
 919                                       runtime->oss.rate, 0);
 920                 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
 921                          params_access(params), params_format(params),
 922                          params_channels(params), params_rate(params));
 923         }
 924         pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
 925                  params_access(sparams), params_format(sparams),
 926                  params_channels(sparams), params_rate(sparams));
 927
 928         oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
 929                          params_channels(params) / 8;
 930
 931         err = snd_pcm_oss_period_size(substream, params, sparams);
 932         if (err < 0)
 933                 goto failure;
 934
 935         n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
 936         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
 937         if (err < 0)
 938                 goto failure;
 939
 940         err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
 941                                      runtime->oss.periods, NULL);
 942         if (err < 0)
 943                 goto failure;
 944
 945         snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
 946
 947         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
 948         if (err < 0) {
 949                 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
 950                 goto failure;
 951         }
 952
 953 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
 954         snd_pcm_oss_plugin_clear(substream);
 955         if (!direct) {
 956                 /* add necessary plugins */
 957                 snd_pcm_oss_plugin_clear(substream);
 958                 err = snd_pcm_plug_format_plugins(substream, params, sparams);
 959                 if (err < 0) {
 960                         pcm_dbg(substream->pcm,
 961                                 "snd_pcm_plug_format_plugins failed: %i\n", err);
 962                         snd_pcm_oss_plugin_clear(substream);
 963                         goto failure;
 964                 }
 965                 if (runtime->oss.plugin_first) {
 966                         struct snd_pcm_plugin *plugin;
 967                         err = snd_pcm_plugin_build_io(substream, sparams, &plugin);
 968                         if (err < 0) {
 969                                 pcm_dbg(substream->pcm,
 970                                         "snd_pcm_plugin_build_io failed: %i\n", err);
 971                                 snd_pcm_oss_plugin_clear(substream);
 972                                 goto failure;
 973                         }
 974                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 975                                 err = snd_pcm_plugin_append(plugin);
 976                         } else {
 977                                 err = snd_pcm_plugin_insert(plugin);
 978                         }
 979                         if (err < 0) {
 980                                 snd_pcm_oss_plugin_clear(substream);
 981                                 goto failure;
 982                         }
 983                 }
 984         }
 985 #endif
 986
 987         if (runtime->oss.trigger) {
 988                 sw_params->start_threshold = 1;
 989         } else {
 990                 sw_params->start_threshold = runtime->boundary;
 991         }
 992         if (atomic_read(&substream->mmap_count) ||
 993             substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 994                 sw_params->stop_threshold = runtime->boundary;
 995         else
 996                 sw_params->stop_threshold = runtime->buffer_size;
 997         sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 998         sw_params->period_step = 1;
 999         sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1000                 1 : runtime->period_size;
1001         if (atomic_read(&substream->mmap_count) ||
1002             substream->oss.setup.nosilence) {
1003                 sw_params->silence_threshold = 0;
1004                 sw_params->silence_size = 0;
1005         } else {
1006                 snd_pcm_uframes_t frames;
1007                 frames = runtime->period_size + 16;
1008                 if (frames > runtime->buffer_size)
1009                         frames = runtime->buffer_size;
1010                 sw_params->silence_threshold = frames;
1011                 sw_params->silence_size = frames;
1012         }
1013
1014         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params);
1015         if (err < 0) {
1016                 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1017                 goto failure;
1018         }
1019
1020         runtime->oss.periods = params_periods(sparams);
1021         oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1022         if (oss_period_size < 0) {
1023                 err = -EINVAL;
1024                 goto failure;
1025         }
1026 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1027         if (runtime->oss.plugin_first) {
1028                 err = snd_pcm_plug_alloc(substream, oss_period_size);
1029                 if (err < 0)
1030                         goto failure;
1031         }
1032 #endif
1033         oss_period_size *= oss_frame_size;
1034
1035         oss_buffer_size = oss_period_size * runtime->oss.periods;
1036         if (oss_buffer_size < 0) {
1037                 err = -EINVAL;
1038                 goto failure;
1039         }
1040
1041         runtime->oss.period_bytes = oss_period_size;
1042         runtime->oss.buffer_bytes = oss_buffer_size;
1043
1044         pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1045                  runtime->oss.period_bytes,
1046                  runtime->oss.buffer_bytes);
1047         pdprintf("slave: period_size = %i, buffer_size = %i\n",
1048                  params_period_size(sparams),
1049                  params_buffer_size(sparams));
1050
1051         runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1052         runtime->oss.channels = params_channels(params);
1053         runtime->oss.rate = params_rate(params);
1054
1055         kvfree(runtime->oss.buffer);
1056         runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1057         if (!runtime->oss.buffer) {
1058                 err = -ENOMEM;
1059                 goto failure;
1060         }
1061
1062         runtime->oss.params = 0;
1063         runtime->oss.prepare = 1;
1064         runtime->oss.buffer_used = 0;
1065         if (runtime->dma_area)
1066                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1067
1068         runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1069
1070         err = 0;
1071 failure:
1072         kfree(sw_params);
1073         kfree(params);
1074         kfree(sparams);
1075         return err;
1076 }
1077
1078 /* this one takes the lock by itself */
1079 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1080                                      bool trylock)
1081 {
1082         struct snd_pcm_runtime *runtime = substream->runtime;
1083         int err;
1084
1085         if (trylock) {
1086                 if (!(mutex_trylock(&runtime->oss.params_lock)))
1087                         return -EAGAIN;
1088         } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1089                 return -ERESTARTSYS;
1090
1091         err = snd_pcm_oss_change_params_locked(substream);
1092         mutex_unlock(&runtime->oss.params_lock);
1093         return err;
1094 }
1095
1096 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1097 {
1098         int idx, err;
1099         struct snd_pcm_substream *asubstream = NULL, *substream;
1100
1101         for (idx = 0; idx < 2; idx++) {
1102                 substream = pcm_oss_file->streams[idx];
1103                 if (substream == NULL)
1104                         continue;
1105                 if (asubstream == NULL)
1106                         asubstream = substream;
1107                 if (substream->runtime->oss.params) {
1108                         err = snd_pcm_oss_change_params(substream, false);
1109                         if (err < 0)
1110                                 return err;
1111                 }
1112         }
1113         if (!asubstream)
1114                 return -EIO;
1115         if (r_substream)
1116                 *r_substream = asubstream;
1117         return 0;
1118 }
1119
1120 /* call with params_lock held */
1121 /* NOTE: this always call PREPARE unconditionally no matter whether
1122  * runtime->oss.prepare is set or not
1123  */
1124 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1125 {
1126         int err;
1127         struct snd_pcm_runtime *runtime = substream->runtime;
1128
1129         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1130         if (err < 0) {
1131                 pcm_dbg(substream->pcm,
1132                         "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1133                 return err;
1134         }
1135         runtime->oss.prepare = 0;
1136         runtime->oss.prev_hw_ptr_period = 0;
1137         runtime->oss.period_ptr = 0;
1138         runtime->oss.buffer_used = 0;
1139
1140         return 0;
1141 }
1142
1143 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1144 {
1145         struct snd_pcm_runtime *runtime;
1146         int err;
1147
1148         runtime = substream->runtime;
1149         if (runtime->oss.params) {
1150                 err = snd_pcm_oss_change_params(substream, false);
1151                 if (err < 0)
1152                         return err;
1153         }
1154         if (runtime->oss.prepare) {
1155                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1156                         return -ERESTARTSYS;
1157                 err = snd_pcm_oss_prepare(substream);
1158                 mutex_unlock(&runtime->oss.params_lock);
1159                 if (err < 0)
1160                         return err;
1161         }
1162         return 0;
1163 }
1164
1165 /* call with params_lock held */
1166 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1167 {
1168         struct snd_pcm_runtime *runtime;
1169         int err;
1170
1171         runtime = substream->runtime;
1172         if (runtime->oss.params) {
1173                 err = snd_pcm_oss_change_params_locked(substream);
1174                 if (err < 0)
1175                         return err;
1176         }
1177         if (runtime->oss.prepare) {
1178                 err = snd_pcm_oss_prepare(substream);
1179                 if (err < 0)
1180                         return err;
1181         }
1182         return 0;
1183 }
1184
1185 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1186 {
1187         struct snd_pcm_runtime *runtime;
1188         snd_pcm_uframes_t frames;
1189         int err = 0;
1190
1191         while (1) {
1192                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1193                 if (err < 0)
1194                         break;
1195                 runtime = substream->runtime;
1196                 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1197                         break;
1198                 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1199                 /* until avail(delay) <= buffer_size */
1200                 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1201                 frames /= runtime->period_size;
1202                 frames *= runtime->period_size;
1203                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1204                 if (err < 0)
1205                         break;
1206         }
1207         return err;
1208 }
1209
1210 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1211 {
1212         struct snd_pcm_runtime *runtime = substream->runtime;
1213         int ret;
1214         while (1) {
1215                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1216                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1217 #ifdef OSS_DEBUG
1218                         pcm_dbg(substream->pcm,
1219                                 "pcm_oss: write: recovering from %s\n",
1220                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1221                                 "XRUN" : "SUSPEND");
1222 #endif
1223                         ret = snd_pcm_oss_prepare(substream);
1224                         if (ret < 0)
1225                                 break;
1226                 }
1227                 mutex_unlock(&runtime->oss.params_lock);
1228                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1229                                          frames, in_kernel);
1230                 mutex_lock(&runtime->oss.params_lock);
1231                 if (ret != -EPIPE && ret != -ESTRPIPE)
1232                         break;
1233                 /* test, if we can't store new data, because the stream */
1234                 /* has not been started */
1235                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1236                         return -EAGAIN;
1237         }
1238         return ret;
1239 }
1240
1241 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1242 {
1243         struct snd_pcm_runtime *runtime = substream->runtime;
1244         snd_pcm_sframes_t delay;
1245         int ret;
1246         while (1) {
1247                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1248                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1249 #ifdef OSS_DEBUG
1250                         pcm_dbg(substream->pcm,
1251                                 "pcm_oss: read: recovering from %s\n",
1252                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1253                                 "XRUN" : "SUSPEND");
1254 #endif
1255                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1256                         if (ret < 0)
1257                                 break;
1258                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1259                         ret = snd_pcm_oss_prepare(substream);
1260                         if (ret < 0)
1261                                 break;
1262                 }
1263                 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1264                 if (ret < 0)
1265                         break;
1266                 mutex_unlock(&runtime->oss.params_lock);
1267                 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1268                                          frames, in_kernel);
1269                 mutex_lock(&runtime->oss.params_lock);
1270                 if (ret == -EPIPE) {
1271                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1272                                 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1273                                 if (ret < 0)
1274                                         break;
1275                         }
1276                         continue;
1277                 }
1278                 if (ret != -ESTRPIPE)
1279                         break;
1280         }
1281         return ret;
1282 }
1283
1284 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1285 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1286 {
1287         struct snd_pcm_runtime *runtime = substream->runtime;
1288         int ret;
1289         while (1) {
1290                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1291                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1292 #ifdef OSS_DEBUG
1293                         pcm_dbg(substream->pcm,
1294                                 "pcm_oss: writev: recovering from %s\n",
1295                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1296                                 "XRUN" : "SUSPEND");
1297 #endif
1298                         ret = snd_pcm_oss_prepare(substream);
1299                         if (ret < 0)
1300                                 break;
1301                 }
1302                 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1303                 if (ret != -EPIPE && ret != -ESTRPIPE)
1304                         break;
1305
1306                 /* test, if we can't store new data, because the stream */
1307                 /* has not been started */
1308                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1309                         return -EAGAIN;
1310         }
1311         return ret;
1312 }
1313
1314 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1315 {
1316         struct snd_pcm_runtime *runtime = substream->runtime;
1317         int ret;
1318         while (1) {
1319                 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1320                     runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1321 #ifdef OSS_DEBUG
1322                         pcm_dbg(substream->pcm,
1323                                 "pcm_oss: readv: recovering from %s\n",
1324                                 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1325                                 "XRUN" : "SUSPEND");
1326 #endif
1327                         ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1328                         if (ret < 0)
1329                                 break;
1330                 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1331                         ret = snd_pcm_oss_prepare(substream);
1332                         if (ret < 0)
1333                                 break;
1334                 }
1335                 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1336                 if (ret != -EPIPE && ret != -ESTRPIPE)
1337                         break;
1338         }
1339         return ret;
1340 }
1341 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1342
1343 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1344 {
1345         struct snd_pcm_runtime *runtime = substream->runtime;
1346         snd_pcm_sframes_t frames, frames1;
1347 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1348         if (runtime->oss.plugin_first) {
1349                 struct snd_pcm_plugin_channel *channels;
1350                 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1351                 if (!in_kernel) {
1352                         if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1353                                 return -EFAULT;
1354                         buf = runtime->oss.buffer;
1355                 }
1356                 frames = bytes / oss_frame_bytes;
1357                 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1358                 if (frames1 < 0)
1359                         return frames1;
1360                 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1361                 if (frames1 <= 0)
1362                         return frames1;
1363                 bytes = frames1 * oss_frame_bytes;
1364         } else
1365 #endif
1366         {
1367                 frames = bytes_to_frames(runtime, bytes);
1368                 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1369                 if (frames1 <= 0)
1370                         return frames1;
1371                 bytes = frames_to_bytes(runtime, frames1);
1372         }
1373         return bytes;
1374 }
1375
1376 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1377 {
1378         size_t xfer = 0;
1379         ssize_t tmp = 0;
1380         struct snd_pcm_runtime *runtime = substream->runtime;
1381
1382         if (atomic_read(&substream->mmap_count))
1383                 return -ENXIO;
1384
1385         atomic_inc(&runtime->oss.rw_ref);
1386         while (bytes > 0) {
1387                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1388                         tmp = -ERESTARTSYS;
1389                         break;
1390                 }
1391                 tmp = snd_pcm_oss_make_ready_locked(substream);
1392                 if (tmp < 0)
1393                         goto err;
1394                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1395                         tmp = bytes;
1396                         if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1397                                 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1398                         if (tmp > 0) {
1399                                 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1400                                         tmp = -EFAULT;
1401                                         goto err;
1402                                 }
1403                         }
1404                         runtime->oss.buffer_used += tmp;
1405                         buf += tmp;
1406                         bytes -= tmp;
1407                         xfer += tmp;
1408                         if (substream->oss.setup.partialfrag ||
1409                             runtime->oss.buffer_used == runtime->oss.period_bytes) {
1410                                 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1411                                                          runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1412                                 if (tmp <= 0)
1413                                         goto err;
1414                                 runtime->oss.bytes += tmp;
1415                                 runtime->oss.period_ptr += tmp;
1416                                 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1417                                 if (runtime->oss.period_ptr == 0 ||
1418                                     runtime->oss.period_ptr == runtime->oss.buffer_used)
1419                                         runtime->oss.buffer_used = 0;
1420                                 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1421                                         tmp = -EAGAIN;
1422                                         goto err;
1423                                 }
1424                         }
1425                 } else {
1426                         tmp = snd_pcm_oss_write2(substream,
1427                                                  (const char __force *)buf,
1428                                                  runtime->oss.period_bytes, 0);
1429                         if (tmp <= 0)
1430                                 goto err;
1431                         runtime->oss.bytes += tmp;
1432                         buf += tmp;
1433                         bytes -= tmp;
1434                         xfer += tmp;
1435                         if ((substream->f_flags & O_NONBLOCK) != 0 &&
1436                             tmp != runtime->oss.period_bytes)
1437                                 tmp = -EAGAIN;
1438                 }
1439  err:
1440                 mutex_unlock(&runtime->oss.params_lock);
1441                 if (tmp < 0)
1442                         break;
1443                 if (signal_pending(current)) {
1444                         tmp = -ERESTARTSYS;
1445                         break;
1446                 }
1447                 tmp = 0;
1448         }
1449         atomic_dec(&runtime->oss.rw_ref);
1450         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1451 }
1452
1453 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1454 {
1455         struct snd_pcm_runtime *runtime = substream->runtime;
1456         snd_pcm_sframes_t frames, frames1;
1457 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1458         char __user *final_dst = (char __force __user *)buf;
1459         if (runtime->oss.plugin_first) {
1460                 struct snd_pcm_plugin_channel *channels;
1461                 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1462                 if (!in_kernel)
1463                         buf = runtime->oss.buffer;
1464                 frames = bytes / oss_frame_bytes;
1465                 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1466                 if (frames1 < 0)
1467                         return frames1;
1468                 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1469                 if (frames1 <= 0)
1470                         return frames1;
1471                 bytes = frames1 * oss_frame_bytes;
1472                 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1473                         return -EFAULT;
1474         } else
1475 #endif
1476         {
1477                 frames = bytes_to_frames(runtime, bytes);
1478                 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1479                 if (frames1 <= 0)
1480                         return frames1;
1481                 bytes = frames_to_bytes(runtime, frames1);
1482         }
1483         return bytes;
1484 }
1485
1486 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1487 {
1488         size_t xfer = 0;
1489         ssize_t tmp = 0;
1490         struct snd_pcm_runtime *runtime = substream->runtime;
1491
1492         if (atomic_read(&substream->mmap_count))
1493                 return -ENXIO;
1494
1495         atomic_inc(&runtime->oss.rw_ref);
1496         while (bytes > 0) {
1497                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1498                         tmp = -ERESTARTSYS;
1499                         break;
1500                 }
1501                 tmp = snd_pcm_oss_make_ready_locked(substream);
1502                 if (tmp < 0)
1503                         goto err;
1504                 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1505                         if (runtime->oss.buffer_used == 0) {
1506                                 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1507                                 if (tmp <= 0)
1508                                         goto err;
1509                                 runtime->oss.bytes += tmp;
1510                                 runtime->oss.period_ptr = tmp;
1511                                 runtime->oss.buffer_used = tmp;
1512                         }
1513                         tmp = bytes;
1514                         if ((size_t) tmp > runtime->oss.buffer_used)
1515                                 tmp = runtime->oss.buffer_used;
1516                         if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1517                                 tmp = -EFAULT;
1518                                 goto err;
1519                         }
1520                         buf += tmp;
1521                         bytes -= tmp;
1522                         xfer += tmp;
1523                         runtime->oss.buffer_used -= tmp;
1524                 } else {
1525                         tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1526                                                 runtime->oss.period_bytes, 0);
1527                         if (tmp <= 0)
1528                                 goto err;
1529                         runtime->oss.bytes += tmp;
1530                         buf += tmp;
1531                         bytes -= tmp;
1532                         xfer += tmp;
1533                 }
1534  err:
1535                 mutex_unlock(&runtime->oss.params_lock);
1536                 if (tmp < 0)
1537                         break;
1538                 if (signal_pending(current)) {
1539                         tmp = -ERESTARTSYS;
1540                         break;
1541                 }
1542                 tmp = 0;
1543         }
1544         atomic_dec(&runtime->oss.rw_ref);
1545         return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1546 }
1547
1548 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1549 {
1550         struct snd_pcm_substream *substream;
1551         struct snd_pcm_runtime *runtime;
1552         int i;
1553
1554         for (i = 0; i < 2; i++) {
1555                 substream = pcm_oss_file->streams[i];
1556                 if (!substream)
1557                         continue;
1558                 runtime = substream->runtime;
1559                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1560                 mutex_lock(&runtime->oss.params_lock);
1561                 runtime->oss.prepare = 1;
1562                 runtime->oss.buffer_used = 0;
1563                 runtime->oss.prev_hw_ptr_period = 0;
1564                 runtime->oss.period_ptr = 0;
1565                 mutex_unlock(&runtime->oss.params_lock);
1566         }
1567         return 0;
1568 }
1569
1570 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1571 {
1572         struct snd_pcm_substream *substream;
1573         int err;
1574
1575         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1576         if (substream != NULL) {
1577                 err = snd_pcm_oss_make_ready(substream);
1578                 if (err < 0)
1579                         return err;
1580                 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1581         }
1582         /* note: all errors from the start action are ignored */
1583         /* OSS apps do not know, how to handle them */
1584         return 0;
1585 }
1586
1587 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1588 {
1589         struct snd_pcm_runtime *runtime;
1590         ssize_t result = 0;
1591         snd_pcm_state_t state;
1592         long res;
1593         wait_queue_entry_t wait;
1594
1595         runtime = substream->runtime;
1596         init_waitqueue_entry(&wait, current);
1597         add_wait_queue(&runtime->sleep, &wait);
1598 #ifdef OSS_DEBUG
1599         pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1600 #endif
1601         while (1) {
1602                 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1603                 if (result > 0) {
1604                         runtime->oss.buffer_used = 0;
1605                         result = 0;
1606                         break;
1607                 }
1608                 if (result != 0 && result != -EAGAIN)
1609                         break;
1610                 result = 0;
1611                 set_current_state(TASK_INTERRUPTIBLE);
1612                 snd_pcm_stream_lock_irq(substream);
1613                 state = runtime->status->state;
1614                 snd_pcm_stream_unlock_irq(substream);
1615                 if (state != SNDRV_PCM_STATE_RUNNING) {
1616                         set_current_state(TASK_RUNNING);
1617                         break;
1618                 }
1619                 res = schedule_timeout(10 * HZ);
1620                 if (signal_pending(current)) {
1621                         result = -ERESTARTSYS;
1622                         break;
1623                 }
1624                 if (res == 0) {
1625                         pcm_err(substream->pcm,
1626                                 "OSS sync error - DMA timeout\n");
1627                         result = -EIO;
1628                         break;
1629                 }
1630         }
1631         remove_wait_queue(&runtime->sleep, &wait);
1632         return result;
1633 }
1634
1635 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1636 {
1637         int err = 0;
1638         unsigned int saved_f_flags;
1639         struct snd_pcm_substream *substream;
1640         struct snd_pcm_runtime *runtime;
1641         snd_pcm_format_t format;
1642         unsigned long width;
1643         size_t size;
1644
1645         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1646         if (substream != NULL) {
1647                 runtime = substream->runtime;
1648                 if (atomic_read(&substream->mmap_count))
1649                         goto __direct;
1650                 err = snd_pcm_oss_make_ready(substream);
1651                 if (err < 0)
1652                         return err;
1653                 atomic_inc(&runtime->oss.rw_ref);
1654                 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1655                         atomic_dec(&runtime->oss.rw_ref);
1656                         return -ERESTARTSYS;
1657                 }
1658                 format = snd_pcm_oss_format_from(runtime->oss.format);
1659                 width = snd_pcm_format_physical_width(format);
1660                 if (runtime->oss.buffer_used > 0) {
1661 #ifdef OSS_DEBUG
1662                         pcm_dbg(substream->pcm, "sync: buffer_used\n");
1663 #endif
1664                         size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1665                         snd_pcm_format_set_silence(format,
1666                                                    runtime->oss.buffer + runtime->oss.buffer_used,
1667                                                    size);
1668                         err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1669                         if (err < 0)
1670                                 goto unlock;
1671                 } else if (runtime->oss.period_ptr > 0) {
1672 #ifdef OSS_DEBUG
1673                         pcm_dbg(substream->pcm, "sync: period_ptr\n");
1674 #endif
1675                         size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1676                         snd_pcm_format_set_silence(format,
1677                                                    runtime->oss.buffer,
1678                                                    size * 8 / width);
1679                         err = snd_pcm_oss_sync1(substream, size);
1680                         if (err < 0)
1681                                 goto unlock;
1682                 }
1683                 /*
1684                  * The ALSA's period might be a bit large than OSS one.
1685                  * Fill the remain portion of ALSA period with zeros.
1686                  */
1687                 size = runtime->control->appl_ptr % runtime->period_size;
1688                 if (size > 0) {
1689                         size = runtime->period_size - size;
1690                         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1691                                 snd_pcm_lib_write(substream, NULL, size);
1692                         else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1693                                 snd_pcm_lib_writev(substream, NULL, size);
1694                 }
1695 unlock:
1696                 mutex_unlock(&runtime->oss.params_lock);
1697                 atomic_dec(&runtime->oss.rw_ref);
1698                 if (err < 0)
1699                         return err;
1700                 /*
1701                  * finish sync: drain the buffer
1702                  */
1703               __direct:
1704                 saved_f_flags = substream->f_flags;
1705                 substream->f_flags &= ~O_NONBLOCK;
1706                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1707                 substream->f_flags = saved_f_flags;
1708                 if (err < 0)
1709                         return err;
1710                 mutex_lock(&runtime->oss.params_lock);
1711                 runtime->oss.prepare = 1;
1712                 mutex_unlock(&runtime->oss.params_lock);
1713         }
1714
1715         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1716         if (substream != NULL) {
1717                 err = snd_pcm_oss_make_ready(substream);
1718                 if (err < 0)
1719                         return err;
1720                 runtime = substream->runtime;
1721                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1722                 if (err < 0)
1723                         return err;
1724                 mutex_lock(&runtime->oss.params_lock);
1725                 runtime->oss.buffer_used = 0;
1726                 runtime->oss.prepare = 1;
1727                 mutex_unlock(&runtime->oss.params_lock);
1728         }
1729         return 0;
1730 }
1731
1732 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1733 {
1734         int idx;
1735
1736         for (idx = 1; idx >= 0; --idx) {
1737                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1738                 struct snd_pcm_runtime *runtime;
1739                 int err;
1740
1741                 if (substream == NULL)
1742                         continue;
1743                 runtime = substream->runtime;
1744                 if (rate < 1000)
1745                         rate = 1000;
1746                 else if (rate > 192000)
1747                         rate = 192000;
1748                 err = lock_params(runtime);
1749                 if (err < 0)
1750                         return err;
1751                 if (runtime->oss.rate != rate) {
1752                         runtime->oss.params = 1;
1753                         runtime->oss.rate = rate;
1754                 }
1755                 unlock_params(runtime);
1756         }
1757         return snd_pcm_oss_get_rate(pcm_oss_file);
1758 }
1759
1760 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1761 {
1762         struct snd_pcm_substream *substream;
1763         int err;
1764
1765         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1766         if (err < 0)
1767                 return err;
1768         return substream->runtime->oss.rate;
1769 }
1770
1771 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1772 {
1773         int idx;
1774         if (channels < 1)
1775                 channels = 1;
1776         if (channels > 128)
1777                 return -EINVAL;
1778         for (idx = 1; idx >= 0; --idx) {
1779                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1780                 struct snd_pcm_runtime *runtime;
1781                 int err;
1782
1783                 if (substream == NULL)
1784                         continue;
1785                 runtime = substream->runtime;
1786                 err = lock_params(runtime);
1787                 if (err < 0)
1788                         return err;
1789                 if (runtime->oss.channels != channels) {
1790                         runtime->oss.params = 1;
1791                         runtime->oss.channels = channels;
1792                 }
1793                 unlock_params(runtime);
1794         }
1795         return snd_pcm_oss_get_channels(pcm_oss_file);
1796 }
1797
1798 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1799 {
1800         struct snd_pcm_substream *substream;
1801         int err;
1802
1803         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1804         if (err < 0)
1805                 return err;
1806         return substream->runtime->oss.channels;
1807 }
1808
1809 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1810 {
1811         struct snd_pcm_substream *substream;
1812         int err;
1813
1814         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1815         if (err < 0)
1816                 return err;
1817         return substream->runtime->oss.period_bytes;
1818 }
1819
1820 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1821 {
1822         struct snd_pcm_substream *substream;
1823         int err;
1824         int direct;
1825         struct snd_pcm_hw_params *params;
1826         unsigned int formats = 0;
1827         const struct snd_mask *format_mask;
1828         int fmt;
1829
1830         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1831         if (err < 0)
1832                 return err;
1833         if (atomic_read(&substream->mmap_count))
1834                 direct = 1;
1835         else
1836                 direct = substream->oss.setup.direct;
1837         if (!direct)
1838                 return AFMT_MU_LAW | AFMT_U8 |
1839                        AFMT_S16_LE | AFMT_S16_BE |
1840                        AFMT_S8 | AFMT_U16_LE |
1841                        AFMT_U16_BE |
1842                         AFMT_S32_LE | AFMT_S32_BE |
1843                         AFMT_S24_LE | AFMT_S24_BE |
1844                         AFMT_S24_PACKED;
1845         params = kmalloc(sizeof(*params), GFP_KERNEL);
1846         if (!params)
1847                 return -ENOMEM;
1848         _snd_pcm_hw_params_any(params);
1849         err = snd_pcm_hw_refine(substream, params);
1850         if (err < 0)
1851                 goto error;
1852         format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1853         for (fmt = 0; fmt < 32; ++fmt) {
1854                 if (snd_mask_test(format_mask, fmt)) {
1855                         int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1856                         if (f >= 0)
1857                                 formats |= f;
1858                 }
1859         }
1860
1861  error:
1862         kfree(params);
1863         return err < 0 ? err : formats;
1864 }
1865
1866 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1867 {
1868         int formats, idx;
1869         int err;
1870
1871         if (format != AFMT_QUERY) {
1872                 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1873                 if (formats < 0)
1874                         return formats;
1875                 if (!(formats & format))
1876                         format = AFMT_U8;
1877                 for (idx = 1; idx >= 0; --idx) {
1878                         struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1879                         struct snd_pcm_runtime *runtime;
1880                         if (substream == NULL)
1881                                 continue;
1882                         runtime = substream->runtime;
1883                         err = lock_params(runtime);
1884                         if (err < 0)
1885                                 return err;
1886                         if (runtime->oss.format != format) {
1887                                 runtime->oss.params = 1;
1888                                 runtime->oss.format = format;
1889                         }
1890                         unlock_params(runtime);
1891                 }
1892         }
1893         return snd_pcm_oss_get_format(pcm_oss_file);
1894 }
1895
1896 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1897 {
1898         struct snd_pcm_substream *substream;
1899         int err;
1900
1901         err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1902         if (err < 0)
1903                 return err;
1904         return substream->runtime->oss.format;
1905 }
1906
1907 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1908 {
1909         struct snd_pcm_runtime *runtime;
1910
1911         runtime = substream->runtime;
1912         if (subdivide == 0) {
1913                 subdivide = runtime->oss.subdivision;
1914                 if (subdivide == 0)
1915                         subdivide = 1;
1916                 return subdivide;
1917         }
1918         if (runtime->oss.subdivision || runtime->oss.fragshift)
1919                 return -EINVAL;
1920         if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1921             subdivide != 8 && subdivide != 16)
1922                 return -EINVAL;
1923         runtime->oss.subdivision = subdivide;
1924         runtime->oss.params = 1;
1925         return subdivide;
1926 }
1927
1928 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1929 {
1930         int err = -EINVAL, idx;
1931
1932         for (idx = 1; idx >= 0; --idx) {
1933                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1934                 struct snd_pcm_runtime *runtime;
1935
1936                 if (substream == NULL)
1937                         continue;
1938                 runtime = substream->runtime;
1939                 err = lock_params(runtime);
1940                 if (err < 0)
1941                         return err;
1942                 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1943                 unlock_params(runtime);
1944                 if (err < 0)
1945                         return err;
1946         }
1947         return err;
1948 }
1949
1950 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1951 {
1952         struct snd_pcm_runtime *runtime;
1953         int fragshift;
1954
1955         runtime = substream->runtime;
1956         if (runtime->oss.subdivision || runtime->oss.fragshift)
1957                 return -EINVAL;
1958         fragshift = val & 0xffff;
1959         if (fragshift >= 31)
1960                 return -EINVAL;
1961         runtime->oss.fragshift = fragshift;
1962         runtime->oss.maxfrags = (val >> 16) & 0xffff;
1963         if (runtime->oss.fragshift < 4)         /* < 16 */
1964                 runtime->oss.fragshift = 4;
1965         if (runtime->oss.maxfrags < 2)
1966                 runtime->oss.maxfrags = 2;
1967         runtime->oss.params = 1;
1968         return 0;
1969 }
1970
1971 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1972 {
1973         int err = -EINVAL, idx;
1974
1975         for (idx = 1; idx >= 0; --idx) {
1976                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1977                 struct snd_pcm_runtime *runtime;
1978
1979                 if (substream == NULL)
1980                         continue;
1981                 runtime = substream->runtime;
1982                 err = lock_params(runtime);
1983                 if (err < 0)
1984                         return err;
1985                 err = snd_pcm_oss_set_fragment1(substream, val);
1986                 unlock_params(runtime);
1987                 if (err < 0)
1988                         return err;
1989         }
1990         return err;
1991 }
1992
1993 static int snd_pcm_oss_nonblock(struct file * file)
1994 {
1995         spin_lock(&file->f_lock);
1996         file->f_flags |= O_NONBLOCK;
1997         spin_unlock(&file->f_lock);
1998         return 0;
1999 }
2000
2001 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2002 {
2003
2004         if (substream == NULL) {
2005                 res &= ~DSP_CAP_DUPLEX;
2006                 return res;
2007         }
2008 #ifdef DSP_CAP_MULTI
2009         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2010                 if (substream->pstr->substream_count > 1)
2011                         res |= DSP_CAP_MULTI;
2012 #endif
2013         /* DSP_CAP_REALTIME is set all times: */
2014         /* all ALSA drivers can return actual pointer in ring buffer */
2015 #if defined(DSP_CAP_REALTIME) && 0
2016         {
2017                 struct snd_pcm_runtime *runtime = substream->runtime;
2018                 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2019                         res &= ~DSP_CAP_REALTIME;
2020         }
2021 #endif
2022         return res;
2023 }
2024
2025 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2026 {
2027         int result, idx;
2028
2029         result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2030         for (idx = 0; idx < 2; idx++) {
2031                 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2032                 result = snd_pcm_oss_get_caps1(substream, result);
2033         }
2034         result |= 0x0001;       /* revision - same as SB AWE 64 */
2035         return result;
2036 }
2037
2038 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2039                                       snd_pcm_uframes_t hw_ptr)
2040 {
2041         struct snd_pcm_runtime *runtime = substream->runtime;
2042         snd_pcm_uframes_t appl_ptr;
2043         appl_ptr = hw_ptr + runtime->buffer_size;
2044         appl_ptr %= runtime->boundary;
2045         runtime->control->appl_ptr = appl_ptr;
2046 }
2047
2048 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2049 {
2050         struct snd_pcm_runtime *runtime;
2051         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2052         int err, cmd;
2053
2054 #ifdef OSS_DEBUG
2055         pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2056 #endif
2057
2058         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2059         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2060
2061         if (psubstream) {
2062                 err = snd_pcm_oss_make_ready(psubstream);
2063                 if (err < 0)
2064                         return err;
2065         }
2066         if (csubstream) {
2067                 err = snd_pcm_oss_make_ready(csubstream);
2068                 if (err < 0)
2069                         return err;
2070         }
2071         if (psubstream) {
2072                 runtime = psubstream->runtime;
2073                 cmd = 0;
2074                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2075                         return -ERESTARTSYS;
2076                 if (trigger & PCM_ENABLE_OUTPUT) {
2077                         if (runtime->oss.trigger)
2078                                 goto _skip1;
2079                         if (atomic_read(&psubstream->mmap_count))
2080                                 snd_pcm_oss_simulate_fill(psubstream,
2081                                                 get_hw_ptr_period(runtime));
2082                         runtime->oss.trigger = 1;
2083                         runtime->start_threshold = 1;
2084                         cmd = SNDRV_PCM_IOCTL_START;
2085                 } else {
2086                         if (!runtime->oss.trigger)
2087                                 goto _skip1;
2088                         runtime->oss.trigger = 0;
2089                         runtime->start_threshold = runtime->boundary;
2090                         cmd = SNDRV_PCM_IOCTL_DROP;
2091                         runtime->oss.prepare = 1;
2092                 }
2093  _skip1:
2094                 mutex_unlock(&runtime->oss.params_lock);
2095                 if (cmd) {
2096                         err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2097                         if (err < 0)
2098                                 return err;
2099                 }
2100         }
2101         if (csubstream) {
2102                 runtime = csubstream->runtime;
2103                 cmd = 0;
2104                 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2105                         return -ERESTARTSYS;
2106                 if (trigger & PCM_ENABLE_INPUT) {
2107                         if (runtime->oss.trigger)
2108                                 goto _skip2;
2109                         runtime->oss.trigger = 1;
2110                         runtime->start_threshold = 1;
2111                         cmd = SNDRV_PCM_IOCTL_START;
2112                 } else {
2113                         if (!runtime->oss.trigger)
2114                                 goto _skip2;
2115                         runtime->oss.trigger = 0;
2116                         runtime->start_threshold = runtime->boundary;
2117                         cmd = SNDRV_PCM_IOCTL_DROP;
2118                         runtime->oss.prepare = 1;
2119                 }
2120  _skip2:
2121                 mutex_unlock(&runtime->oss.params_lock);
2122                 if (cmd) {
2123                         err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2124                         if (err < 0)
2125                                 return err;
2126                 }
2127         }
2128         return 0;
2129 }
2130
2131 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2132 {
2133         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2134         int result = 0;
2135
2136         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2137         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2138         if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2139                 result |= PCM_ENABLE_OUTPUT;
2140         if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2141                 result |= PCM_ENABLE_INPUT;
2142         return result;
2143 }
2144
2145 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2146 {
2147         struct snd_pcm_substream *substream;
2148         struct snd_pcm_runtime *runtime;
2149         snd_pcm_sframes_t delay;
2150         int err;
2151
2152         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2153         if (substream == NULL)
2154                 return -EINVAL;
2155         err = snd_pcm_oss_make_ready(substream);
2156         if (err < 0)
2157                 return err;
2158         runtime = substream->runtime;
2159         if (runtime->oss.params || runtime->oss.prepare)
2160                 return 0;
2161         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2162         if (err == -EPIPE)
2163                 delay = 0;      /* hack for broken OSS applications */
2164         else if (err < 0)
2165                 return err;
2166         return snd_pcm_oss_bytes(substream, delay);
2167 }
2168
2169 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2170 {
2171         struct snd_pcm_substream *substream;
2172         struct snd_pcm_runtime *runtime;
2173         snd_pcm_sframes_t delay;
2174         int fixup;
2175         struct count_info info;
2176         int err;
2177
2178         if (_info == NULL)
2179                 return -EFAULT;
2180         substream = pcm_oss_file->streams[stream];
2181         if (substream == NULL)
2182                 return -EINVAL;
2183         err = snd_pcm_oss_make_ready(substream);
2184         if (err < 0)
2185                 return err;
2186         runtime = substream->runtime;
2187         if (runtime->oss.params || runtime->oss.prepare) {
2188                 memset(&info, 0, sizeof(info));
2189                 if (copy_to_user(_info, &info, sizeof(info)))
2190                         return -EFAULT;
2191                 return 0;
2192         }
2193         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2194                 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2195                 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2196                         err = 0;
2197                         delay = 0;
2198                         fixup = 0;
2199                 } else {
2200                         fixup = runtime->oss.buffer_used;
2201                 }
2202         } else {
2203                 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2204                 fixup = -runtime->oss.buffer_used;
2205         }
2206         if (err < 0)
2207                 return err;
2208         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2209         if (atomic_read(&substream->mmap_count)) {
2210                 snd_pcm_sframes_t n;
2211                 delay = get_hw_ptr_period(runtime);
2212                 n = delay - runtime->oss.prev_hw_ptr_period;
2213                 if (n < 0)
2214                         n += runtime->boundary;
2215                 info.blocks = n / runtime->period_size;
2216                 runtime->oss.prev_hw_ptr_period = delay;
2217                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2218                         snd_pcm_oss_simulate_fill(substream, delay);
2219                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2220         } else {
2221                 delay = snd_pcm_oss_bytes(substream, delay);
2222                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2223                         if (substream->oss.setup.buggyptr)
2224                                 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2225                         else
2226                                 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2227                         info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2228                 } else {
2229                         delay += fixup;
2230                         info.blocks = delay / runtime->oss.period_bytes;
2231                         info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2232                 }
2233         }
2234         if (copy_to_user(_info, &info, sizeof(info)))
2235                 return -EFAULT;
2236         return 0;
2237 }
2238
2239 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2240 {
2241         struct snd_pcm_substream *substream;
2242         struct snd_pcm_runtime *runtime;
2243         snd_pcm_sframes_t avail;
2244         int fixup;
2245         struct audio_buf_info info;
2246         int err;
2247
2248         if (_info == NULL)
2249                 return -EFAULT;
2250         substream = pcm_oss_file->streams[stream];
2251         if (substream == NULL)
2252                 return -EINVAL;
2253         runtime = substream->runtime;
2254
2255         if (runtime->oss.params) {
2256                 err = snd_pcm_oss_change_params(substream, false);
2257                 if (err < 0)
2258                         return err;
2259         }
2260
2261         info.fragsize = runtime->oss.period_bytes;
2262         info.fragstotal = runtime->periods;
2263         if (runtime->oss.prepare) {
2264                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2265                         info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2266                         info.fragments = runtime->oss.periods;
2267                 } else {
2268                         info.bytes = 0;
2269                         info.fragments = 0;
2270                 }
2271         } else {
2272                 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2273                         err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2274                         if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2275                                 avail = runtime->buffer_size;
2276                                 err = 0;
2277                                 fixup = 0;
2278                         } else {
2279                                 avail = runtime->buffer_size - avail;
2280                                 fixup = -runtime->oss.buffer_used;
2281                         }
2282                 } else {
2283                         err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2284                         fixup = runtime->oss.buffer_used;
2285                 }
2286                 if (err < 0)
2287                         return err;
2288                 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2289                 info.fragments = info.bytes / runtime->oss.period_bytes;
2290         }
2291
2292 #ifdef OSS_DEBUG
2293         pcm_dbg(substream->pcm,
2294                 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2295                 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2296 #endif
2297         if (copy_to_user(_info, &info, sizeof(info)))
2298                 return -EFAULT;
2299         return 0;
2300 }
2301
2302 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2303 {
2304         // it won't be probably implemented
2305         // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2306         return -EINVAL;
2307 }
2308
2309 static const char *strip_task_path(const char *path)
2310 {
2311         const char *ptr, *ptrl = NULL;
2312         for (ptr = path; *ptr; ptr++) {
2313                 if (*ptr == '/')
2314                         ptrl = ptr + 1;
2315         }
2316         return ptrl;
2317 }
2318
2319 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2320                                       const char *task_name,
2321                                       struct snd_pcm_oss_setup *rsetup)
2322 {
2323         struct snd_pcm_oss_setup *setup;
2324
2325         mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2326         do {
2327                 for (setup = pcm->streams[stream].oss.setup_list; setup;
2328                      setup = setup->next) {
2329                         if (!strcmp(setup->task_name, task_name))
2330                                 goto out;
2331                 }
2332         } while ((task_name = strip_task_path(task_name)) != NULL);
2333  out:
2334         if (setup)
2335                 *rsetup = *setup;
2336         mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2337 }
2338
2339 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2340 {
2341         struct snd_pcm_runtime *runtime;
2342         runtime = substream->runtime;
2343         kvfree(runtime->oss.buffer);
2344         runtime->oss.buffer = NULL;
2345 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2346         snd_pcm_oss_plugin_clear(substream);
2347 #endif
2348         substream->oss.oss = 0;
2349 }
2350
2351 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2352                                        struct snd_pcm_oss_setup *setup,
2353                                        int minor)
2354 {
2355         struct snd_pcm_runtime *runtime;
2356
2357         substream->oss.oss = 1;
2358         substream->oss.setup = *setup;
2359         if (setup->nonblock)
2360                 substream->f_flags |= O_NONBLOCK;
2361         else if (setup->block)
2362                 substream->f_flags &= ~O_NONBLOCK;
2363         runtime = substream->runtime;
2364         runtime->oss.params = 1;
2365         runtime->oss.trigger = 1;
2366         runtime->oss.rate = 8000;
2367         mutex_init(&runtime->oss.params_lock);
2368         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2369         case SNDRV_MINOR_OSS_PCM_8:
2370                 runtime->oss.format = AFMT_U8;
2371                 break;
2372         case SNDRV_MINOR_OSS_PCM_16:
2373                 runtime->oss.format = AFMT_S16_LE;
2374                 break;
2375         default:
2376                 runtime->oss.format = AFMT_MU_LAW;
2377         }
2378         runtime->oss.channels = 1;
2379         runtime->oss.fragshift = 0;
2380         runtime->oss.maxfrags = 0;
2381         runtime->oss.subdivision = 0;
2382         substream->pcm_release = snd_pcm_oss_release_substream;
2383         atomic_set(&runtime->oss.rw_ref, 0);
2384 }
2385
2386 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2387 {
2388         int cidx;
2389         if (!pcm_oss_file)
2390                 return 0;
2391         for (cidx = 0; cidx < 2; ++cidx) {
2392                 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2393                 if (substream)
2394                         snd_pcm_release_substream(substream);
2395         }
2396         kfree(pcm_oss_file);
2397         return 0;
2398 }
2399
2400 static int snd_pcm_oss_open_file(struct file *file,
2401                                  struct snd_pcm *pcm,
2402                                  struct snd_pcm_oss_file **rpcm_oss_file,
2403                                  int minor,
2404                                  struct snd_pcm_oss_setup *setup)
2405 {
2406         int idx, err;
2407         struct snd_pcm_oss_file *pcm_oss_file;
2408         struct snd_pcm_substream *substream;
2409         fmode_t f_mode = file->f_mode;
2410
2411         if (rpcm_oss_file)
2412                 *rpcm_oss_file = NULL;
2413
2414         pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2415         if (pcm_oss_file == NULL)
2416                 return -ENOMEM;
2417
2418         if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2419             (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2420                 f_mode = FMODE_WRITE;
2421
2422         file->f_flags &= ~O_APPEND;
2423         for (idx = 0; idx < 2; idx++) {
2424                 if (setup[idx].disable)
2425                         continue;
2426                 if (! pcm->streams[idx].substream_count)
2427                         continue; /* no matching substream */
2428                 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2429                         if (! (f_mode & FMODE_WRITE))
2430                                 continue;
2431                 } else {
2432                         if (! (f_mode & FMODE_READ))
2433                                 continue;
2434                 }
2435                 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2436                 if (err < 0) {
2437                         snd_pcm_oss_release_file(pcm_oss_file);
2438                         return err;
2439                 }
2440
2441                 pcm_oss_file->streams[idx] = substream;
2442                 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2443         }
2444
2445         if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2446                 snd_pcm_oss_release_file(pcm_oss_file);
2447                 return -EINVAL;
2448         }
2449
2450         file->private_data = pcm_oss_file;
2451         if (rpcm_oss_file)
2452                 *rpcm_oss_file = pcm_oss_file;
2453         return 0;
2454 }
2455
2456
2457 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2458 {
2459         unsigned int idx;
2460
2461         if (snd_BUG_ON(!task || !name || size < 2))
2462                 return -EINVAL;
2463         for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2464                 name[idx] = task->comm[idx];
2465         name[idx] = '\0';
2466         return 0;
2467 }
2468
2469 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2470 {
2471         int err;
2472         char task_name[32];
2473         struct snd_pcm *pcm;
2474         struct snd_pcm_oss_file *pcm_oss_file;
2475         struct snd_pcm_oss_setup setup[2];
2476         int nonblock;
2477         wait_queue_entry_t wait;
2478
2479         err = nonseekable_open(inode, file);
2480         if (err < 0)
2481                 return err;
2482
2483         pcm = snd_lookup_oss_minor_data(iminor(inode),
2484                                         SNDRV_OSS_DEVICE_TYPE_PCM);
2485         if (pcm == NULL) {
2486                 err = -ENODEV;
2487                 goto __error1;
2488         }
2489         err = snd_card_file_add(pcm->card, file);
2490         if (err < 0)
2491                 goto __error1;
2492         if (!try_module_get(pcm->card->module)) {
2493                 err = -EFAULT;
2494                 goto __error2;
2495         }
2496         if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2497                 err = -EFAULT;
2498                 goto __error;
2499         }
2500         memset(setup, 0, sizeof(setup));
2501         if (file->f_mode & FMODE_WRITE)
2502                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2503                                            task_name, &setup[0]);
2504         if (file->f_mode & FMODE_READ)
2505                 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2506                                            task_name, &setup[1]);
2507
2508         nonblock = !!(file->f_flags & O_NONBLOCK);
2509         if (!nonblock)
2510                 nonblock = nonblock_open;
2511
2512         init_waitqueue_entry(&wait, current);
2513         add_wait_queue(&pcm->open_wait, &wait);
2514         mutex_lock(&pcm->open_mutex);
2515         while (1) {
2516                 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2517                                             iminor(inode), setup);
2518                 if (err >= 0)
2519                         break;
2520                 if (err == -EAGAIN) {
2521                         if (nonblock) {
2522                                 err = -EBUSY;
2523                                 break;
2524                         }
2525                 } else
2526                         break;
2527                 set_current_state(TASK_INTERRUPTIBLE);
2528                 mutex_unlock(&pcm->open_mutex);
2529                 schedule();
2530                 mutex_lock(&pcm->open_mutex);
2531                 if (pcm->card->shutdown) {
2532                         err = -ENODEV;
2533                         break;
2534                 }
2535                 if (signal_pending(current)) {
2536                         err = -ERESTARTSYS;
2537                         break;
2538                 }
2539         }
2540         remove_wait_queue(&pcm->open_wait, &wait);
2541         mutex_unlock(&pcm->open_mutex);
2542         if (err < 0)
2543                 goto __error;
2544         snd_card_unref(pcm->card);
2545         return err;
2546
2547       __error:
2548         module_put(pcm->card->module);
2549       __error2:
2550         snd_card_file_remove(pcm->card, file);
2551       __error1:
2552         if (pcm)
2553                 snd_card_unref(pcm->card);
2554         return err;
2555 }
2556
2557 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2558 {
2559         struct snd_pcm *pcm;
2560         struct snd_pcm_substream *substream;
2561         struct snd_pcm_oss_file *pcm_oss_file;
2562
2563         pcm_oss_file = file->private_data;
2564         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2565         if (substream == NULL)
2566                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2567         if (snd_BUG_ON(!substream))
2568                 return -ENXIO;
2569         pcm = substream->pcm;
2570         if (!pcm->card->shutdown)
2571                 snd_pcm_oss_sync(pcm_oss_file);
2572         mutex_lock(&pcm->open_mutex);
2573         snd_pcm_oss_release_file(pcm_oss_file);
2574         mutex_unlock(&pcm->open_mutex);
2575         wake_up(&pcm->open_wait);
2576         module_put(pcm->card->module);
2577         snd_card_file_remove(pcm->card, file);
2578         return 0;
2579 }
2580
2581 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2582 {
2583         struct snd_pcm_oss_file *pcm_oss_file;
2584         int __user *p = (int __user *)arg;
2585         int res;
2586
2587         pcm_oss_file = file->private_data;
2588         if (cmd == OSS_GETVERSION)
2589                 return put_user(SNDRV_OSS_VERSION, p);
2590         if (cmd == OSS_ALSAEMULVER)
2591                 return put_user(1, p);
2592 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2593         if (((cmd >> 8) & 0xff) == 'M') {       /* mixer ioctl - for OSS compatibility */
2594                 struct snd_pcm_substream *substream;
2595                 int idx;
2596                 for (idx = 0; idx < 2; ++idx) {
2597                         substream = pcm_oss_file->streams[idx];
2598                         if (substream != NULL)
2599                                 break;
2600                 }
2601                 if (snd_BUG_ON(idx >= 2))
2602                         return -ENXIO;
2603                 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2604         }
2605 #endif
2606         if (((cmd >> 8) & 0xff) != 'P')
2607                 return -EINVAL;
2608 #ifdef OSS_DEBUG
2609         pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2610 #endif
2611         switch (cmd) {
2612         case SNDCTL_DSP_RESET:
2613                 return snd_pcm_oss_reset(pcm_oss_file);
2614         case SNDCTL_DSP_SYNC:
2615                 return snd_pcm_oss_sync(pcm_oss_file);
2616         case SNDCTL_DSP_SPEED:
2617                 if (get_user(res, p))
2618                         return -EFAULT;
2619                 res = snd_pcm_oss_set_rate(pcm_oss_file, res);
2620                 if (res < 0)
2621                         return res;
2622                 return put_user(res, p);
2623         case SOUND_PCM_READ_RATE:
2624                 res = snd_pcm_oss_get_rate(pcm_oss_file);
2625                 if (res < 0)
2626                         return res;
2627                 return put_user(res, p);
2628         case SNDCTL_DSP_STEREO:
2629                 if (get_user(res, p))
2630                         return -EFAULT;
2631                 res = res > 0 ? 2 : 1;
2632                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2633                 if (res < 0)
2634                         return res;
2635                 return put_user(--res, p);
2636         case SNDCTL_DSP_GETBLKSIZE:
2637                 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2638                 if (res < 0)
2639                         return res;
2640                 return put_user(res, p);
2641         case SNDCTL_DSP_SETFMT:
2642                 if (get_user(res, p))
2643                         return -EFAULT;
2644                 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2645                 if (res < 0)
2646                         return res;
2647                 return put_user(res, p);
2648         case SOUND_PCM_READ_BITS:
2649                 res = snd_pcm_oss_get_format(pcm_oss_file);
2650                 if (res < 0)
2651                         return res;
2652                 return put_user(res, p);
2653         case SNDCTL_DSP_CHANNELS:
2654                 if (get_user(res, p))
2655                         return -EFAULT;
2656                 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2657                 if (res < 0)
2658                         return res;
2659                 return put_user(res, p);
2660         case SOUND_PCM_READ_CHANNELS:
2661                 res = snd_pcm_oss_get_channels(pcm_oss_file);
2662                 if (res < 0)
2663                         return res;
2664                 return put_user(res, p);
2665         case SOUND_PCM_WRITE_FILTER:
2666         case SOUND_PCM_READ_FILTER:
2667                 return -EIO;
2668         case SNDCTL_DSP_POST:
2669                 return snd_pcm_oss_post(pcm_oss_file);
2670         case SNDCTL_DSP_SUBDIVIDE:
2671                 if (get_user(res, p))
2672                         return -EFAULT;
2673                 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2674                 if (res < 0)
2675                         return res;
2676                 return put_user(res, p);
2677         case SNDCTL_DSP_SETFRAGMENT:
2678                 if (get_user(res, p))
2679                         return -EFAULT;
2680                 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2681         case SNDCTL_DSP_GETFMTS:
2682                 res = snd_pcm_oss_get_formats(pcm_oss_file);
2683                 if (res < 0)
2684                         return res;
2685                 return put_user(res, p);
2686         case SNDCTL_DSP_GETOSPACE:
2687         case SNDCTL_DSP_GETISPACE:
2688                 return snd_pcm_oss_get_space(pcm_oss_file,
2689                         cmd == SNDCTL_DSP_GETISPACE ?
2690                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2691                         (struct audio_buf_info __user *) arg);
2692         case SNDCTL_DSP_NONBLOCK:
2693                 return snd_pcm_oss_nonblock(file);
2694         case SNDCTL_DSP_GETCAPS:
2695                 res = snd_pcm_oss_get_caps(pcm_oss_file);
2696                 if (res < 0)
2697                         return res;
2698                 return put_user(res, p);
2699         case SNDCTL_DSP_GETTRIGGER:
2700                 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2701                 if (res < 0)
2702                         return res;
2703                 return put_user(res, p);
2704         case SNDCTL_DSP_SETTRIGGER:
2705                 if (get_user(res, p))
2706                         return -EFAULT;
2707                 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2708         case SNDCTL_DSP_GETIPTR:
2709         case SNDCTL_DSP_GETOPTR:
2710                 return snd_pcm_oss_get_ptr(pcm_oss_file,
2711                         cmd == SNDCTL_DSP_GETIPTR ?
2712                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2713                         (struct count_info __user *) arg);
2714         case SNDCTL_DSP_MAPINBUF:
2715         case SNDCTL_DSP_MAPOUTBUF:
2716                 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2717                         cmd == SNDCTL_DSP_MAPINBUF ?
2718                                 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2719                         (struct buffmem_desc __user *) arg);
2720         case SNDCTL_DSP_SETSYNCRO:
2721                 /* stop DMA now.. */
2722                 return 0;
2723         case SNDCTL_DSP_SETDUPLEX:
2724                 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2725                         return 0;
2726                 return -EIO;
2727         case SNDCTL_DSP_GETODELAY:
2728                 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2729                 if (res < 0) {
2730                         /* it's for sure, some broken apps don't check for error codes */
2731                         put_user(0, p);
2732                         return res;
2733                 }
2734                 return put_user(res, p);
2735         case SNDCTL_DSP_PROFILE:
2736                 return 0;       /* silently ignore */
2737         default:
2738                 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2739         }
2740         return -EINVAL;
2741 }
2742
2743 #ifdef CONFIG_COMPAT
2744 /* all compatible */
2745 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2746                                      unsigned long arg)
2747 {
2748         /*
2749          * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2750          * which are not implemented for the native case either
2751          */
2752         return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2753 }
2754 #else
2755 #define snd_pcm_oss_ioctl_compat        NULL
2756 #endif
2757
2758 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2759 {
2760         struct snd_pcm_oss_file *pcm_oss_file;
2761         struct snd_pcm_substream *substream;
2762
2763         pcm_oss_file = file->private_data;
2764         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2765         if (substream == NULL)
2766                 return -ENXIO;
2767         substream->f_flags = file->f_flags & O_NONBLOCK;
2768 #ifndef OSS_DEBUG
2769         return snd_pcm_oss_read1(substream, buf, count);
2770 #else
2771         {
2772                 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2773                 pcm_dbg(substream->pcm,
2774                         "pcm_oss: read %li bytes (returned %li bytes)\n",
2775                         (long)count, (long)res);
2776                 return res;
2777         }
2778 #endif
2779 }
2780
2781 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2782 {
2783         struct snd_pcm_oss_file *pcm_oss_file;
2784         struct snd_pcm_substream *substream;
2785         long result;
2786
2787         pcm_oss_file = file->private_data;
2788         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2789         if (substream == NULL)
2790                 return -ENXIO;
2791         substream->f_flags = file->f_flags & O_NONBLOCK;
2792         result = snd_pcm_oss_write1(substream, buf, count);
2793 #ifdef OSS_DEBUG
2794         pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2795                (long)count, (long)result);
2796 #endif
2797         return result;
2798 }
2799
2800 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2801 {
2802         struct snd_pcm_runtime *runtime = substream->runtime;
2803         if (atomic_read(&substream->mmap_count))
2804                 return runtime->oss.prev_hw_ptr_period !=
2805                                                 get_hw_ptr_period(runtime);
2806         else
2807                 return snd_pcm_playback_avail(runtime) >=
2808                                                 runtime->oss.period_frames;
2809 }
2810
2811 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2812 {
2813         struct snd_pcm_runtime *runtime = substream->runtime;
2814         if (atomic_read(&substream->mmap_count))
2815                 return runtime->oss.prev_hw_ptr_period !=
2816                                                 get_hw_ptr_period(runtime);
2817         else
2818                 return snd_pcm_capture_avail(runtime) >=
2819                                                 runtime->oss.period_frames;
2820 }
2821
2822 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2823 {
2824         struct snd_pcm_oss_file *pcm_oss_file;
2825         __poll_t mask;
2826         struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2827
2828         pcm_oss_file = file->private_data;
2829
2830         psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2831         csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2832
2833         mask = 0;
2834         if (psubstream != NULL) {
2835                 struct snd_pcm_runtime *runtime = psubstream->runtime;
2836                 poll_wait(file, &runtime->sleep, wait);
2837                 snd_pcm_stream_lock_irq(psubstream);
2838                 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2839                     (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2840                      snd_pcm_oss_playback_ready(psubstream)))
2841                         mask |= EPOLLOUT | EPOLLWRNORM;
2842                 snd_pcm_stream_unlock_irq(psubstream);
2843         }
2844         if (csubstream != NULL) {
2845                 struct snd_pcm_runtime *runtime = csubstream->runtime;
2846                 snd_pcm_state_t ostate;
2847                 poll_wait(file, &runtime->sleep, wait);
2848                 snd_pcm_stream_lock_irq(csubstream);
2849                 ostate = runtime->status->state;
2850                 if (ostate != SNDRV_PCM_STATE_RUNNING ||
2851                     snd_pcm_oss_capture_ready(csubstream))
2852                         mask |= EPOLLIN | EPOLLRDNORM;
2853                 snd_pcm_stream_unlock_irq(csubstream);
2854                 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2855                         struct snd_pcm_oss_file ofile;
2856                         memset(&ofile, 0, sizeof(ofile));
2857                         ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2858                         runtime->oss.trigger = 0;
2859                         snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2860                 }
2861         }
2862
2863         return mask;
2864 }
2865
2866 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2867 {
2868         struct snd_pcm_oss_file *pcm_oss_file;
2869         struct snd_pcm_substream *substream = NULL;
2870         struct snd_pcm_runtime *runtime;
2871         int err;
2872
2873 #ifdef OSS_DEBUG
2874         pr_debug("pcm_oss: mmap begin\n");
2875 #endif
2876         pcm_oss_file = file->private_data;
2877         switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2878         case VM_READ | VM_WRITE:
2879                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2880                 if (substream)
2881                         break;
2882                 fallthrough;
2883         case VM_READ:
2884                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2885                 break;
2886         case VM_WRITE:
2887                 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2888                 break;
2889         default:
2890                 return -EINVAL;
2891         }
2892         /* set VM_READ access as well to fix memset() routines that do
2893            reads before writes (to improve performance) */
2894         area->vm_flags |= VM_READ;
2895         if (substream == NULL)
2896                 return -ENXIO;
2897         runtime = substream->runtime;
2898         if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2899                 return -EIO;
2900         if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2901                 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2902         else
2903                 return -EIO;
2904
2905         if (runtime->oss.params) {
2906                 /* use mutex_trylock() for params_lock for avoiding a deadlock
2907                  * between mmap_lock and params_lock taken by
2908                  * copy_from/to_user() in snd_pcm_oss_write/read()
2909                  */
2910                 err = snd_pcm_oss_change_params(substream, true);
2911                 if (err < 0)
2912                         return err;
2913         }
2914 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2915         if (runtime->oss.plugin_first != NULL)
2916                 return -EIO;
2917 #endif
2918
2919         if (area->vm_pgoff != 0)
2920                 return -EINVAL;
2921
2922         err = snd_pcm_mmap_data(substream, file, area);
2923         if (err < 0)
2924                 return err;
2925         runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2926         runtime->silence_threshold = 0;
2927         runtime->silence_size = 0;
2928 #ifdef OSS_DEBUG
2929         pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2930                runtime->oss.mmap_bytes);
2931 #endif
2932         /* In mmap mode we never stop */
2933         runtime->stop_threshold = runtime->boundary;
2934
2935         return 0;
2936 }
2937
2938 #ifdef CONFIG_SND_VERBOSE_PROCFS
2939 /*
2940  *  /proc interface
2941  */
2942
2943 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2944                                   struct snd_info_buffer *buffer)
2945 {
2946         struct snd_pcm_str *pstr = entry->private_data;
2947         struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2948         mutex_lock(&pstr->oss.setup_mutex);
2949         while (setup) {
2950                 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2951                             setup->task_name,
2952                             setup->periods,
2953                             setup->period_size,
2954                             setup->disable ? " disable" : "",
2955                             setup->direct ? " direct" : "",
2956                             setup->block ? " block" : "",
2957                             setup->nonblock ? " non-block" : "",
2958                             setup->partialfrag ? " partial-frag" : "",
2959                             setup->nosilence ? " no-silence" : "");
2960                 setup = setup->next;
2961         }
2962         mutex_unlock(&pstr->oss.setup_mutex);
2963 }
2964
2965 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2966 {
2967         struct snd_pcm_oss_setup *setup, *setupn;
2968
2969         for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2970              setup; setup = setupn) {
2971                 setupn = setup->next;
2972                 kfree(setup->task_name);
2973                 kfree(setup);
2974         }
2975         pstr->oss.setup_list = NULL;
2976 }
2977
2978 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2979                                    struct snd_info_buffer *buffer)
2980 {
2981         struct snd_pcm_str *pstr = entry->private_data;
2982         char line[128], str[32], task_name[32];
2983         const char *ptr;
2984         int idx1;
2985         struct snd_pcm_oss_setup *setup, *setup1, template;
2986
2987         while (!snd_info_get_line(buffer, line, sizeof(line))) {
2988                 mutex_lock(&pstr->oss.setup_mutex);
2989                 memset(&template, 0, sizeof(template));
2990                 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2991                 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2992                         snd_pcm_oss_proc_free_setup_list(pstr);
2993                         mutex_unlock(&pstr->oss.setup_mutex);
2994                         continue;
2995                 }
2996                 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2997                         if (!strcmp(setup->task_name, task_name)) {
2998                                 template = *setup;
2999                                 break;
3000                         }
3001                 }
3002                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3003                 template.periods = simple_strtoul(str, NULL, 10);
3004                 ptr = snd_info_get_str(str, ptr, sizeof(str));
3005                 template.period_size = simple_strtoul(str, NULL, 10);
3006                 for (idx1 = 31; idx1 >= 0; idx1--)
3007                         if (template.period_size & (1 << idx1))
3008                                 break;
3009                 for (idx1--; idx1 >= 0; idx1--)
3010                         template.period_size &= ~(1 << idx1);
3011                 do {
3012                         ptr = snd_info_get_str(str, ptr, sizeof(str));
3013                         if (!strcmp(str, "disable")) {
3014                                 template.disable = 1;
3015                         } else if (!strcmp(str, "direct")) {
3016                                 template.direct = 1;
3017                         } else if (!strcmp(str, "block")) {
3018                                 template.block = 1;
3019                         } else if (!strcmp(str, "non-block")) {
3020                                 template.nonblock = 1;
3021                         } else if (!strcmp(str, "partial-frag")) {
3022                                 template.partialfrag = 1;
3023                         } else if (!strcmp(str, "no-silence")) {
3024                                 template.nosilence = 1;
3025                         } else if (!strcmp(str, "buggy-ptr")) {
3026                                 template.buggyptr = 1;
3027                         }
3028                 } while (*str);
3029                 if (setup == NULL) {
3030                         setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3031                         if (! setup) {
3032                                 buffer->error = -ENOMEM;
3033                                 mutex_unlock(&pstr->oss.setup_mutex);
3034                                 return;
3035                         }
3036                         if (pstr->oss.setup_list == NULL)
3037                                 pstr->oss.setup_list = setup;
3038                         else {
3039                                 for (setup1 = pstr->oss.setup_list;
3040                                      setup1->next; setup1 = setup1->next);
3041                                 setup1->next = setup;
3042                         }
3043                         template.task_name = kstrdup(task_name, GFP_KERNEL);
3044                         if (! template.task_name) {
3045                                 kfree(setup);
3046                                 buffer->error = -ENOMEM;
3047                                 mutex_unlock(&pstr->oss.setup_mutex);
3048                                 return;
3049                         }
3050                 }
3051                 *setup = template;
3052                 mutex_unlock(&pstr->oss.setup_mutex);
3053         }
3054 }
3055
3056 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3057 {
3058         int stream;
3059         for (stream = 0; stream < 2; ++stream) {
3060                 struct snd_info_entry *entry;
3061                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3062                 if (pstr->substream_count == 0)
3063                         continue;
3064                 entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root);
3065                 if (entry) {
3066                         entry->content = SNDRV_INFO_CONTENT_TEXT;
3067                         entry->mode = S_IFREG | 0644;
3068                         entry->c.text.read = snd_pcm_oss_proc_read;
3069                         entry->c.text.write = snd_pcm_oss_proc_write;
3070                         entry->private_data = pstr;
3071                         if (snd_info_register(entry) < 0) {
3072                                 snd_info_free_entry(entry);
3073                                 entry = NULL;
3074                         }
3075                 }
3076                 pstr->oss.proc_entry = entry;
3077         }
3078 }
3079
3080 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3081 {
3082         int stream;
3083         for (stream = 0; stream < 2; ++stream) {
3084                 struct snd_pcm_str *pstr = &pcm->streams[stream];
3085                 snd_info_free_entry(pstr->oss.proc_entry);
3086                 pstr->oss.proc_entry = NULL;
3087                 snd_pcm_oss_proc_free_setup_list(pstr);
3088         }
3089 }
3090 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3091 static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3092 {
3093 }
3094 static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3095 {
3096 }
3097 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3098
3099 /*
3100  *  ENTRY functions
3101  */
3102
3103 static const struct file_operations snd_pcm_oss_f_reg =
3104 {
3105         .owner =        THIS_MODULE,
3106         .read =         snd_pcm_oss_read,
3107         .write =        snd_pcm_oss_write,
3108         .open =         snd_pcm_oss_open,
3109         .release =      snd_pcm_oss_release,
3110         .llseek =       no_llseek,
3111         .poll =         snd_pcm_oss_poll,
3112         .unlocked_ioctl =       snd_pcm_oss_ioctl,
3113         .compat_ioctl = snd_pcm_oss_ioctl_compat,
3114         .mmap =         snd_pcm_oss_mmap,
3115 };
3116
3117 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3118 {
3119         if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3120                                     pcm->card, index, &snd_pcm_oss_f_reg,
3121                                     pcm) < 0) {
3122                 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3123                            pcm->card->number, pcm->device);
3124         }
3125 }
3126
3127 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3128 {
3129         pcm->oss.reg = 0;
3130         if (dsp_map[pcm->card->number] == (int)pcm->device) {
3131                 char name[128];
3132                 int duplex;
3133                 register_oss_dsp(pcm, 0);
3134                 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3135                               pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3136                               !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3137                 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3138 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3139                 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3140                                       pcm->card->number,
3141                                       name);
3142 #endif
3143                 pcm->oss.reg++;
3144                 pcm->oss.reg_mask |= 1;
3145         }
3146         if (adsp_map[pcm->card->number] == (int)pcm->device) {
3147                 register_oss_dsp(pcm, 1);
3148                 pcm->oss.reg++;
3149                 pcm->oss.reg_mask |= 2;
3150         }
3151
3152         if (pcm->oss.reg)
3153                 snd_pcm_oss_proc_init(pcm);
3154
3155         return 0;
3156 }
3157
3158 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3159 {
3160         if (pcm->oss.reg) {
3161                 if (pcm->oss.reg_mask & 1) {
3162                         pcm->oss.reg_mask &= ~1;
3163                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3164                                                   pcm->card, 0);
3165                 }
3166                 if (pcm->oss.reg_mask & 2) {
3167                         pcm->oss.reg_mask &= ~2;
3168                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3169                                                   pcm->card, 1);
3170                 }
3171                 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3172 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3173                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3174 #endif
3175                 }
3176                 pcm->oss.reg = 0;
3177         }
3178         return 0;
3179 }
3180
3181 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3182 {
3183         snd_pcm_oss_disconnect_minor(pcm);
3184         snd_pcm_oss_proc_done(pcm);
3185         return 0;
3186 }
3187
3188 static struct snd_pcm_notify snd_pcm_oss_notify =
3189 {
3190         .n_register =   snd_pcm_oss_register_minor,
3191         .n_disconnect = snd_pcm_oss_disconnect_minor,
3192         .n_unregister = snd_pcm_oss_unregister_minor,
3193 };
3194
3195 static int __init alsa_pcm_oss_init(void)
3196 {
3197         int i;
3198         int err;
3199
3200         /* check device map table */
3201         for (i = 0; i < SNDRV_CARDS; i++) {
3202                 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3203                         pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3204                                    i, dsp_map[i]);
3205                         dsp_map[i] = 0;
3206                 }
3207                 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3208                         pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3209                                    i, adsp_map[i]);
3210                         adsp_map[i] = 1;
3211                 }
3212         }
3213         err = snd_pcm_notify(&snd_pcm_oss_notify, 0);
3214         if (err < 0)
3215                 return err;
3216         return 0;
3217 }
3218
3219 static void __exit alsa_pcm_oss_exit(void)
3220 {
3221         snd_pcm_notify(&snd_pcm_oss_notify, 1);
3222 }
3223
3224 module_init(alsa_pcm_oss_init)
3225 module_exit(alsa_pcm_oss_exit)