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