drivers/media/usb/em28xx/em28xx-core.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   4 //
   5 // Copyright (C) 2005 Ludovico Cavedon <[email protected]>
   6 //                    Markus Rechberger <[email protected]>
   7 //                    Mauro Carvalho Chehab <[email protected]>
   8 //                    Sascha Sommer <[email protected]>
   9 // Copyright (C) 2012 Frank Schäfer <[email protected]>
  10
  11 #include "em28xx.h"
  12
  13 #include <linux/init.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/list.h>
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/usb.h>
  19 #include <linux/vmalloc.h>
  20 #include <sound/ac97_codec.h>
  21 #include <media/v4l2-common.h>
  22
  23 #define DRIVER_AUTHOR "Ludovico Cavedon <[email protected]>, " \
  24                       "Markus Rechberger <[email protected]>, " \
  25                       "Mauro Carvalho Chehab <[email protected]>, " \
  26                       "Sascha Sommer <[email protected]>"
  27
  28 MODULE_AUTHOR(DRIVER_AUTHOR);
  29 MODULE_DESCRIPTION(DRIVER_DESC);
  30 MODULE_LICENSE("GPL v2");
  31 MODULE_VERSION(EM28XX_VERSION);
  32
  33 /* #define ENABLE_DEBUG_ISOC_FRAMES */
  34
  35 static unsigned int core_debug;
  36 module_param(core_debug, int, 0644);
  37 MODULE_PARM_DESC(core_debug, "enable debug messages [core and isoc]");
  38
  39 #define em28xx_coredbg(fmt, arg...) do {                                \
  40         if (core_debug)                                                 \
  41                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  42                            "core: %s: " fmt, __func__, ## arg);         \
  43 } while (0)
  44
  45 static unsigned int reg_debug;
  46 module_param(reg_debug, int, 0644);
  47 MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
  48
  49 #define em28xx_regdbg(fmt, arg...) do {                         \
  50         if (reg_debug)                                                  \
  51                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  52                            "reg: %s: " fmt, __func__, ## arg);          \
  53 } while (0)
  54
  55 /* FIXME: don't abuse core_debug */
  56 #define em28xx_isocdbg(fmt, arg...) do {                                \
  57         if (core_debug)                                                 \
  58                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  59                            "core: %s: " fmt, __func__, ## arg);         \
  60 } while (0)
  61
  62 /*
  63  * em28xx_read_reg_req()
  64  * reads data from the usb device specifying bRequest
  65  */
  66 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
  67                             char *buf, int len)
  68 {
  69         int ret;
  70         struct usb_device *udev = interface_to_usbdev(dev->intf);
  71         int pipe = usb_rcvctrlpipe(udev, 0);
  72
  73         if (dev->disconnected)
  74                 return -ENODEV;
  75
  76         if (len > URB_MAX_CTRL_SIZE)
  77                 return -EINVAL;
  78
  79         mutex_lock(&dev->ctrl_urb_lock);
  80         ret = usb_control_msg(udev, pipe, req,
  81                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  82                               0x0000, reg, dev->urb_buf, len, 1000);
  83         if (ret < 0) {
  84                 em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x  failed with error %i\n",
  85                               pipe,
  86                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  87                               req, 0, 0,
  88                               reg & 0xff, reg >> 8,
  89                               len & 0xff, len >> 8, ret);
  90                 mutex_unlock(&dev->ctrl_urb_lock);
  91                 return usb_translate_errors(ret);
  92         }
  93
  94         if (len)
  95                 memcpy(buf, dev->urb_buf, len);
  96
  97         mutex_unlock(&dev->ctrl_urb_lock);
  98
  99         em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x <<< %*ph\n",
 100                       pipe, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 101                       req, 0, 0,
 102                       reg & 0xff, reg >> 8,
 103                       len & 0xff, len >> 8, len, buf);
 104
 105         return ret;
 106 }
 107
 108 /*
 109  * em28xx_read_reg_req()
 110  * reads data from the usb device specifying bRequest
 111  */
 112 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
 113 {
 114         int ret;
 115         u8 val;
 116
 117         ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
 118         if (ret < 0)
 119                 return ret;
 120
 121         return val;
 122 }
 123
 124 int em28xx_read_reg(struct em28xx *dev, u16 reg)
 125 {
 126         return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
 127 }
 128 EXPORT_SYMBOL_GPL(em28xx_read_reg);
 129
 130 /*
 131  * em28xx_write_regs_req()
 132  * sends data to the usb device, specifying bRequest
 133  */
 134 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
 135                           int len)
 136 {
 137         int ret;
 138         struct usb_device *udev = interface_to_usbdev(dev->intf);
 139         int pipe = usb_sndctrlpipe(udev, 0);
 140
 141         if (dev->disconnected)
 142                 return -ENODEV;
 143
 144         if (len < 1 || len > URB_MAX_CTRL_SIZE)
 145                 return -EINVAL;
 146
 147         mutex_lock(&dev->ctrl_urb_lock);
 148         memcpy(dev->urb_buf, buf, len);
 149         ret = usb_control_msg(udev, pipe, req,
 150                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 151                               0x0000, reg, dev->urb_buf, len, 1000);
 152         mutex_unlock(&dev->ctrl_urb_lock);
 153
 154         if (ret < 0) {
 155                 em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph  failed with error %i\n",
 156                               pipe,
 157                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 158                               req, 0, 0,
 159                               reg & 0xff, reg >> 8,
 160                               len & 0xff, len >> 8, len, buf, ret);
 161                 return usb_translate_errors(ret);
 162         }
 163
 164         em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph\n",
 165                       pipe,
 166                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 167                       req, 0, 0,
 168                       reg & 0xff, reg >> 8,
 169                       len & 0xff, len >> 8, len, buf);
 170
 171         if (dev->wait_after_write)
 172                 msleep(dev->wait_after_write);
 173
 174         return ret;
 175 }
 176
 177 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
 178 {
 179         return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
 180 }
 181 EXPORT_SYMBOL_GPL(em28xx_write_regs);
 182
 183 /* Write a single register */
 184 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
 185 {
 186         return em28xx_write_regs(dev, reg, &val, 1);
 187 }
 188 EXPORT_SYMBOL_GPL(em28xx_write_reg);
 189
 190 /*
 191  * em28xx_write_reg_bits()
 192  * sets only some bits (specified by bitmask) of a register, by first reading
 193  * the actual value
 194  */
 195 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
 196                           u8 bitmask)
 197 {
 198         int oldval;
 199         u8 newval;
 200
 201         oldval = em28xx_read_reg(dev, reg);
 202         if (oldval < 0)
 203                 return oldval;
 204
 205         newval = (((u8)oldval) & ~bitmask) | (val & bitmask);
 206
 207         return em28xx_write_regs(dev, reg, &newval, 1);
 208 }
 209 EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
 210
 211 /*
 212  * em28xx_toggle_reg_bits()
 213  * toggles/inverts the bits (specified by bitmask) of a register
 214  */
 215 int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask)
 216 {
 217         int oldval;
 218         u8 newval;
 219
 220         oldval = em28xx_read_reg(dev, reg);
 221         if (oldval < 0)
 222                 return oldval;
 223
 224         newval = (~oldval & bitmask) | (oldval & ~bitmask);
 225
 226         return em28xx_write_reg(dev, reg, newval);
 227 }
 228 EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits);
 229
 230 /*
 231  * em28xx_is_ac97_ready()
 232  * Checks if ac97 is ready
 233  */
 234 static int em28xx_is_ac97_ready(struct em28xx *dev)
 235 {
 236         unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_AC97_XFER_TIMEOUT);
 237         int ret;
 238
 239         /* Wait up to 50 ms for AC97 command to complete */
 240         while (time_is_after_jiffies(timeout)) {
 241                 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
 242                 if (ret < 0)
 243                         return ret;
 244
 245                 if (!(ret & 0x01))
 246                         return 0;
 247                 msleep(5);
 248         }
 249
 250         dev_warn(&dev->intf->dev,
 251                  "AC97 command still being executed: not handled properly!\n");
 252         return -EBUSY;
 253 }
 254
 255 /*
 256  * em28xx_read_ac97()
 257  * write a 16 bit value to the specified AC97 address (LSB first!)
 258  */
 259 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
 260 {
 261         int ret;
 262         u8 addr = (reg & 0x7f) | 0x80;
 263         __le16 val;
 264
 265         ret = em28xx_is_ac97_ready(dev);
 266         if (ret < 0)
 267                 return ret;
 268
 269         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 270         if (ret < 0)
 271                 return ret;
 272
 273         ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
 274                                            (u8 *)&val, sizeof(val));
 275
 276         if (ret < 0)
 277                 return ret;
 278         return le16_to_cpu(val);
 279 }
 280 EXPORT_SYMBOL_GPL(em28xx_read_ac97);
 281
 282 /*
 283  * em28xx_write_ac97()
 284  * write a 16 bit value to the specified AC97 address (LSB first!)
 285  */
 286 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
 287 {
 288         int ret;
 289         u8 addr = reg & 0x7f;
 290         __le16 value;
 291
 292         value = cpu_to_le16(val);
 293
 294         ret = em28xx_is_ac97_ready(dev);
 295         if (ret < 0)
 296                 return ret;
 297
 298         ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *)&value, 2);
 299         if (ret < 0)
 300                 return ret;
 301
 302         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 303         if (ret < 0)
 304                 return ret;
 305
 306         return 0;
 307 }
 308 EXPORT_SYMBOL_GPL(em28xx_write_ac97);
 309
 310 struct em28xx_vol_itable {
 311         enum em28xx_amux mux;
 312         u8               reg;
 313 };
 314
 315 static struct em28xx_vol_itable inputs[] = {
 316         { EM28XX_AMUX_VIDEO,    AC97_VIDEO      },
 317         { EM28XX_AMUX_LINE_IN,  AC97_LINE       },
 318         { EM28XX_AMUX_PHONE,    AC97_PHONE      },
 319         { EM28XX_AMUX_MIC,      AC97_MIC        },
 320         { EM28XX_AMUX_CD,       AC97_CD         },
 321         { EM28XX_AMUX_AUX,      AC97_AUX        },
 322         { EM28XX_AMUX_PCM_OUT,  AC97_PCM        },
 323 };
 324
 325 static int set_ac97_input(struct em28xx *dev)
 326 {
 327         int ret, i;
 328         enum em28xx_amux amux = dev->ctl_ainput;
 329
 330         /*
 331          * EM28XX_AMUX_VIDEO2 is a special case used to indicate that
 332          * em28xx should point to LINE IN, while AC97 should use VIDEO
 333          */
 334         if (amux == EM28XX_AMUX_VIDEO2)
 335                 amux = EM28XX_AMUX_VIDEO;
 336
 337         /* Mute all entres but the one that were selected */
 338         for (i = 0; i < ARRAY_SIZE(inputs); i++) {
 339                 if (amux == inputs[i].mux)
 340                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
 341                 else
 342                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
 343
 344                 if (ret < 0)
 345                         dev_warn(&dev->intf->dev,
 346                                  "couldn't setup AC97 register %d\n",
 347                                  inputs[i].reg);
 348         }
 349         return 0;
 350 }
 351
 352 static int em28xx_set_audio_source(struct em28xx *dev)
 353 {
 354         int ret;
 355         u8 input;
 356
 357         if (dev->board.is_em2800) {
 358                 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
 359                         input = EM2800_AUDIO_SRC_TUNER;
 360                 else
 361                         input = EM2800_AUDIO_SRC_LINE;
 362
 363                 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
 364                 if (ret < 0)
 365                         return ret;
 366         }
 367
 368         if (dev->has_msp34xx) {
 369                 input = EM28XX_AUDIO_SRC_TUNER;
 370         } else {
 371                 switch (dev->ctl_ainput) {
 372                 case EM28XX_AMUX_VIDEO:
 373                         input = EM28XX_AUDIO_SRC_TUNER;
 374                         break;
 375                 default:
 376                         input = EM28XX_AUDIO_SRC_LINE;
 377                         break;
 378                 }
 379         }
 380
 381         if (dev->board.mute_gpio && dev->mute)
 382                 em28xx_gpio_set(dev, dev->board.mute_gpio);
 383         else
 384                 em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 385
 386         ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
 387         if (ret < 0)
 388                 return ret;
 389         usleep_range(10000, 11000);
 390
 391         switch (dev->audio_mode.ac97) {
 392         case EM28XX_NO_AC97:
 393                 break;
 394         default:
 395                 ret = set_ac97_input(dev);
 396         }
 397
 398         return ret;
 399 }
 400
 401 struct em28xx_vol_otable {
 402         enum em28xx_aout mux;
 403         u8               reg;
 404 };
 405
 406 static const struct em28xx_vol_otable outputs[] = {
 407         { EM28XX_AOUT_MASTER, AC97_MASTER               },
 408         { EM28XX_AOUT_LINE,   AC97_HEADPHONE            },
 409         { EM28XX_AOUT_MONO,   AC97_MASTER_MONO          },
 410         { EM28XX_AOUT_LFE,    AC97_CENTER_LFE_MASTER    },
 411         { EM28XX_AOUT_SURR,   AC97_SURROUND_MASTER      },
 412 };
 413
 414 int em28xx_audio_analog_set(struct em28xx *dev)
 415 {
 416         int ret, i;
 417         u8 xclk;
 418
 419         /* Set GPIOs here for boards without audio */
 420         if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE)
 421                 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 422
 423         /*
 424          * It is assumed that all devices use master volume for output.
 425          * It would be possible to use also line output.
 426          */
 427         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 428                 /* Mute all outputs */
 429                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 430                         ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
 431                         if (ret < 0)
 432                                 dev_warn(&dev->intf->dev,
 433                                          "couldn't setup AC97 register %d\n",
 434                                          outputs[i].reg);
 435                 }
 436         }
 437
 438         xclk = dev->board.xclk & 0x7f;
 439         if (!dev->mute)
 440                 xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
 441
 442         ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
 443         if (ret < 0)
 444                 return ret;
 445         usleep_range(10000, 11000);
 446
 447         /* Selects the proper audio input */
 448         ret = em28xx_set_audio_source(dev);
 449
 450         /* Sets volume */
 451         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 452                 int vol;
 453
 454                 em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
 455                 em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
 456                 em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
 457
 458                 /* LSB: left channel - both channels with the same level */
 459                 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
 460
 461                 /* Mute device, if needed */
 462                 if (dev->mute)
 463                         vol |= 0x8000;
 464
 465                 /* Sets volume */
 466                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 467                         if (dev->ctl_aoutput & outputs[i].mux)
 468                                 ret = em28xx_write_ac97(dev, outputs[i].reg,
 469                                                         vol);
 470                         if (ret < 0)
 471                                 dev_warn(&dev->intf->dev,
 472                                          "couldn't setup AC97 register %d\n",
 473                                          outputs[i].reg);
 474                 }
 475
 476                 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
 477                         int sel = ac97_return_record_select(dev->ctl_aoutput);
 478
 479                         /*
 480                          * Use the same input for both left and right
 481                          * channels
 482                          */
 483                         sel |= (sel << 8);
 484
 485                         em28xx_write_ac97(dev, AC97_REC_SEL, sel);
 486                 }
 487         }
 488
 489         return ret;
 490 }
 491 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
 492
 493 int em28xx_audio_setup(struct em28xx *dev)
 494 {
 495         int vid1, vid2, feat, cfg;
 496         u32 vid = 0;
 497         u8 i2s_samplerates;
 498
 499         if (dev->chip_id == CHIP_ID_EM2870 ||
 500             dev->chip_id == CHIP_ID_EM2874 ||
 501             dev->chip_id == CHIP_ID_EM28174 ||
 502             dev->chip_id == CHIP_ID_EM28178) {
 503                 /* Digital only device - don't load any alsa module */
 504                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 505                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 506                 return 0;
 507         }
 508
 509         /* See how this device is configured */
 510         cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
 511         dev_info(&dev->intf->dev, "Config register raw data: 0x%02x\n", cfg);
 512         if (cfg < 0) { /* Register read error */
 513                 /* Be conservative */
 514                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 515         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
 516                 /* The device doesn't have vendor audio at all */
 517                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 518                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 519                 return 0;
 520         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
 521                 dev->int_audio_type = EM28XX_INT_AUDIO_I2S;
 522                 if (dev->chip_id < CHIP_ID_EM2860 &&
 523                     (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 524                     EM2820_CHIPCFG_I2S_1_SAMPRATE)
 525                         i2s_samplerates = 1;
 526                 else if (dev->chip_id >= CHIP_ID_EM2860 &&
 527                          (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 528                          EM2860_CHIPCFG_I2S_5_SAMPRATES)
 529                         i2s_samplerates = 5;
 530                 else
 531                         i2s_samplerates = 3;
 532                 dev_info(&dev->intf->dev, "I2S Audio (%d sample rate(s))\n",
 533                          i2s_samplerates);
 534                 /* Skip the code that does AC97 vendor detection */
 535                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 536                 goto init_audio;
 537         } else {
 538                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 539         }
 540
 541         dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
 542
 543         vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
 544         if (vid1 < 0) {
 545                 /*
 546                  * Device likely doesn't support AC97
 547                  * Note: (some) em2800 devices without eeprom reports 0x91 on
 548                  *       CHIPCFG register, even not having an AC97 chip
 549                  */
 550                 dev_warn(&dev->intf->dev,
 551                          "AC97 chip type couldn't be determined\n");
 552                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 553                 if (dev->usb_audio_type == EM28XX_USB_AUDIO_VENDOR)
 554                         dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 555                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 556                 goto init_audio;
 557         }
 558
 559         vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
 560         if (vid2 < 0)
 561                 goto init_audio;
 562
 563         vid = vid1 << 16 | vid2;
 564         dev_warn(&dev->intf->dev, "AC97 vendor ID = 0x%08x\n", vid);
 565
 566         feat = em28xx_read_ac97(dev, AC97_RESET);
 567         if (feat < 0)
 568                 goto init_audio;
 569
 570         dev_warn(&dev->intf->dev, "AC97 features = 0x%04x\n", feat);
 571
 572         /* Try to identify what audio processor we have */
 573         if ((vid == 0xffffffff || vid == 0x83847650) && feat == 0x6a90)
 574                 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
 575         else if ((vid >> 8) == 0x838476)
 576                 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
 577
 578 init_audio:
 579         /* Reports detected AC97 processor */
 580         switch (dev->audio_mode.ac97) {
 581         case EM28XX_NO_AC97:
 582                 dev_info(&dev->intf->dev, "No AC97 audio processor\n");
 583                 break;
 584         case EM28XX_AC97_EM202:
 585                 dev_info(&dev->intf->dev,
 586                          "Empia 202 AC97 audio processor detected\n");
 587                 break;
 588         case EM28XX_AC97_SIGMATEL:
 589                 dev_info(&dev->intf->dev,
 590                          "Sigmatel audio processor detected (stac 97%02x)\n",
 591                          vid & 0xff);
 592                 break;
 593         case EM28XX_AC97_OTHER:
 594                 dev_warn(&dev->intf->dev,
 595                          "Unknown AC97 audio processor detected!\n");
 596                 break;
 597         default:
 598                 break;
 599         }
 600
 601         return em28xx_audio_analog_set(dev);
 602 }
 603 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
 604
 605 const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
 606                                          enum em28xx_led_role role)
 607 {
 608         if (dev->board.leds) {
 609                 u8 k = 0;
 610
 611                 while (dev->board.leds[k].role >= 0 &&
 612                        dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
 613                         if (dev->board.leds[k].role == role)
 614                                 return &dev->board.leds[k];
 615                         k++;
 616                 }
 617         }
 618         return NULL;
 619 }
 620 EXPORT_SYMBOL_GPL(em28xx_find_led);
 621
 622 int em28xx_capture_start(struct em28xx *dev, int start)
 623 {
 624         int rc;
 625         const struct em28xx_led *led = NULL;
 626
 627         if (dev->chip_id == CHIP_ID_EM2874 ||
 628             dev->chip_id == CHIP_ID_EM2884 ||
 629             dev->chip_id == CHIP_ID_EM28174 ||
 630             dev->chip_id == CHIP_ID_EM28178) {
 631                 /* The Transport Stream Enable Register moved in em2874 */
 632                 if (dev->dvb_xfer_bulk) {
 633                         /* Max Tx Size = 188 * 256 = 48128 - LCM(188,512) * 2 */
 634                         em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
 635                                          EM2874_R5D_TS1_PKT_SIZE :
 636                                          EM2874_R5E_TS2_PKT_SIZE,
 637                                          0xff);
 638                 } else {
 639                         /* ISOC Maximum Transfer Size = 188 * 5 */
 640                         em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
 641                                          EM2874_R5D_TS1_PKT_SIZE :
 642                                          EM2874_R5E_TS2_PKT_SIZE,
 643                                          dev->dvb_max_pkt_size_isoc / 188);
 644                 }
 645                 if (dev->ts == PRIMARY_TS)
 646                         rc = em28xx_write_reg_bits(dev,
 647                                                    EM2874_R5F_TS_ENABLE,
 648                                                    start ? EM2874_TS1_CAPTURE_ENABLE : 0x00,
 649                                                    EM2874_TS1_CAPTURE_ENABLE | EM2874_TS1_FILTER_ENABLE | EM2874_TS1_NULL_DISCARD);
 650                 else
 651                         rc = em28xx_write_reg_bits(dev,
 652                                                    EM2874_R5F_TS_ENABLE,
 653                                                    start ? EM2874_TS2_CAPTURE_ENABLE : 0x00,
 654                                                    EM2874_TS2_CAPTURE_ENABLE | EM2874_TS2_FILTER_ENABLE | EM2874_TS2_NULL_DISCARD);
 655         } else {
 656                 /* FIXME: which is the best order? */
 657                 /* video registers are sampled by VREF */
 658                 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
 659                                            start ? 0x10 : 0x00, 0x10);
 660                 if (rc < 0)
 661                         return rc;
 662
 663                 if (start) {
 664                         if (dev->is_webcam)
 665                                 rc = em28xx_write_reg(dev, 0x13, 0x0c);
 666
 667                         /* Enable video capture */
 668                         rc = em28xx_write_reg(dev, 0x48, 0x00);
 669                         if (rc < 0)
 670                                 return rc;
 671
 672                         if (dev->mode == EM28XX_ANALOG_MODE)
 673                                 rc = em28xx_write_reg(dev,
 674                                                       EM28XX_R12_VINENABLE,
 675                                                       0x67);
 676                         else
 677                                 rc = em28xx_write_reg(dev,
 678                                                       EM28XX_R12_VINENABLE,
 679                                                       0x37);
 680                         if (rc < 0)
 681                                 return rc;
 682
 683                         usleep_range(10000, 11000);
 684                 } else {
 685                         /* disable video capture */
 686                         rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
 687                 }
 688         }
 689
 690         if (dev->mode == EM28XX_ANALOG_MODE)
 691                 led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
 692         else if (dev->ts == PRIMARY_TS)
 693                 led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING);
 694         else
 695                 led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING_TS2);
 696
 697         if (led)
 698                 em28xx_write_reg_bits(dev, led->gpio_reg,
 699                                       (!start ^ led->inverted) ?
 700                                       ~led->gpio_mask : led->gpio_mask,
 701                                       led->gpio_mask);
 702
 703         return rc;
 704 }
 705
 706 int em28xx_gpio_set(struct em28xx *dev, const struct em28xx_reg_seq *gpio)
 707 {
 708         int rc = 0;
 709
 710         if (!gpio)
 711                 return rc;
 712
 713         if (dev->mode != EM28XX_SUSPEND) {
 714                 em28xx_write_reg(dev, 0x48, 0x00);
 715                 if (dev->mode == EM28XX_ANALOG_MODE)
 716                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
 717                 else
 718                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
 719                 usleep_range(10000, 11000);
 720         }
 721
 722         /* Send GPIO reset sequences specified at board entry */
 723         while (gpio->sleep >= 0) {
 724                 if (gpio->reg >= 0) {
 725                         rc = em28xx_write_reg_bits(dev,
 726                                                    gpio->reg,
 727                                                    gpio->val,
 728                                                    gpio->mask);
 729                         if (rc < 0)
 730                                 return rc;
 731                 }
 732                 if (gpio->sleep > 0)
 733                         msleep(gpio->sleep);
 734
 735                 gpio++;
 736         }
 737         return rc;
 738 }
 739 EXPORT_SYMBOL_GPL(em28xx_gpio_set);
 740
 741 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
 742 {
 743         if (dev->mode == set_mode)
 744                 return 0;
 745
 746         if (set_mode == EM28XX_SUSPEND) {
 747                 dev->mode = set_mode;
 748
 749                 /* FIXME: add suspend support for ac97 */
 750
 751                 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
 752         }
 753
 754         dev->mode = set_mode;
 755
 756         if (dev->mode == EM28XX_DIGITAL_MODE)
 757                 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
 758         else
 759                 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 760 }
 761 EXPORT_SYMBOL_GPL(em28xx_set_mode);
 762
 763 /*
 764  *URB control
 765  */
 766
 767 /*
 768  * URB completion handler for isoc/bulk transfers
 769  */
 770 static void em28xx_irq_callback(struct urb *urb)
 771 {
 772         struct em28xx *dev = urb->context;
 773         unsigned long flags;
 774         int i;
 775
 776         switch (urb->status) {
 777         case 0:             /* success */
 778         case -ETIMEDOUT:    /* NAK */
 779                 break;
 780         case -ECONNRESET:   /* kill */
 781         case -ENOENT:
 782         case -ESHUTDOWN:
 783                 return;
 784         default:            /* error */
 785                 em28xx_isocdbg("urb completion error %d.\n", urb->status);
 786                 break;
 787         }
 788
 789         /* Copy data from URB */
 790         spin_lock_irqsave(&dev->slock, flags);
 791         dev->usb_ctl.urb_data_copy(dev, urb);
 792         spin_unlock_irqrestore(&dev->slock, flags);
 793
 794         /* Reset urb buffers */
 795         for (i = 0; i < urb->number_of_packets; i++) {
 796                 /* isoc only (bulk: number_of_packets = 0) */
 797                 urb->iso_frame_desc[i].status = 0;
 798                 urb->iso_frame_desc[i].actual_length = 0;
 799         }
 800         urb->status = 0;
 801
 802         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 803         if (urb->status) {
 804                 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
 805                                urb->status);
 806         }
 807 }
 808
 809 /*
 810  * Stop and Deallocate URBs
 811  */
 812 void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
 813 {
 814         struct urb *urb;
 815         struct em28xx_usb_bufs *usb_bufs;
 816         int i;
 817
 818         em28xx_isocdbg("called %s in mode %d\n", __func__, mode);
 819
 820         if (mode == EM28XX_DIGITAL_MODE)
 821                 usb_bufs = &dev->usb_ctl.digital_bufs;
 822         else
 823                 usb_bufs = &dev->usb_ctl.analog_bufs;
 824
 825         for (i = 0; i < usb_bufs->num_bufs; i++) {
 826                 urb = usb_bufs->urb[i];
 827                 if (urb) {
 828                         if (!irqs_disabled())
 829                                 usb_kill_urb(urb);
 830                         else
 831                                 usb_unlink_urb(urb);
 832
 833                         usb_free_urb(urb);
 834                         usb_bufs->urb[i] = NULL;
 835                 }
 836         }
 837
 838         kfree(usb_bufs->urb);
 839         kfree(usb_bufs->buf);
 840
 841         usb_bufs->urb = NULL;
 842         usb_bufs->buf = NULL;
 843         usb_bufs->num_bufs = 0;
 844
 845         em28xx_capture_start(dev, 0);
 846 }
 847 EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
 848
 849 /*
 850  * Stop URBs
 851  */
 852 void em28xx_stop_urbs(struct em28xx *dev)
 853 {
 854         int i;
 855         struct urb *urb;
 856         struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
 857
 858         em28xx_isocdbg("called %s\n", __func__);
 859
 860         for (i = 0; i < isoc_bufs->num_bufs; i++) {
 861                 urb = isoc_bufs->urb[i];
 862                 if (urb) {
 863                         if (!irqs_disabled())
 864                                 usb_kill_urb(urb);
 865                         else
 866                                 usb_unlink_urb(urb);
 867                 }
 868         }
 869
 870         em28xx_capture_start(dev, 0);
 871 }
 872 EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
 873
 874 /*
 875  * Allocate URBs
 876  */
 877 int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
 878                       int num_bufs, int max_pkt_size, int packet_multiplier)
 879 {
 880         struct em28xx_usb_bufs *usb_bufs;
 881         struct urb *urb;
 882         struct usb_device *udev = interface_to_usbdev(dev->intf);
 883         int i;
 884         int sb_size, pipe;
 885         int j, k;
 886
 887         em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
 888
 889         /*
 890          * Check mode and if we have an endpoint for the selected
 891          * transfer type, select buffer
 892          */
 893         if (mode == EM28XX_DIGITAL_MODE) {
 894                 if ((xfer_bulk && !dev->dvb_ep_bulk) ||
 895                     (!xfer_bulk && !dev->dvb_ep_isoc)) {
 896                         dev_err(&dev->intf->dev,
 897                                 "no endpoint for DVB mode and transfer type %d\n",
 898                                 xfer_bulk > 0);
 899                         return -EINVAL;
 900                 }
 901                 usb_bufs = &dev->usb_ctl.digital_bufs;
 902         } else if (mode == EM28XX_ANALOG_MODE) {
 903                 if ((xfer_bulk && !dev->analog_ep_bulk) ||
 904                     (!xfer_bulk && !dev->analog_ep_isoc)) {
 905                         dev_err(&dev->intf->dev,
 906                                 "no endpoint for analog mode and transfer type %d\n",
 907                                 xfer_bulk > 0);
 908                         return -EINVAL;
 909                 }
 910                 usb_bufs = &dev->usb_ctl.analog_bufs;
 911         } else {
 912                 dev_err(&dev->intf->dev, "invalid mode selected\n");
 913                 return -EINVAL;
 914         }
 915
 916         /* De-allocates all pending stuff */
 917         em28xx_uninit_usb_xfer(dev, mode);
 918
 919         usb_bufs->num_bufs = num_bufs;
 920
 921         usb_bufs->urb = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
 922         if (!usb_bufs->urb)
 923                 return -ENOMEM;
 924
 925         usb_bufs->buf = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
 926         if (!usb_bufs->buf) {
 927                 kfree(usb_bufs->urb);
 928                 return -ENOMEM;
 929         }
 930
 931         usb_bufs->max_pkt_size = max_pkt_size;
 932         if (xfer_bulk)
 933                 usb_bufs->num_packets = 0;
 934         else
 935                 usb_bufs->num_packets = packet_multiplier;
 936         dev->usb_ctl.vid_buf = NULL;
 937         dev->usb_ctl.vbi_buf = NULL;
 938
 939         sb_size = packet_multiplier * usb_bufs->max_pkt_size;
 940
 941         /* allocate urbs and transfer buffers */
 942         for (i = 0; i < usb_bufs->num_bufs; i++) {
 943                 urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
 944                 if (!urb) {
 945                         em28xx_uninit_usb_xfer(dev, mode);
 946                         return -ENOMEM;
 947                 }
 948                 usb_bufs->urb[i] = urb;
 949
 950                 usb_bufs->buf[i] = kzalloc(sb_size, GFP_KERNEL);
 951                 if (!usb_bufs->buf[i]) {
 952                         for (i--; i >= 0; i--)
 953                                 kfree(usb_bufs->buf[i]);
 954
 955                         em28xx_uninit_usb_xfer(dev, mode);
 956                         return -ENOMEM;
 957                 }
 958
 959                 urb->transfer_flags = URB_FREE_BUFFER;
 960
 961                 if (xfer_bulk) { /* bulk */
 962                         pipe = usb_rcvbulkpipe(udev,
 963                                                mode == EM28XX_ANALOG_MODE ?
 964                                                dev->analog_ep_bulk :
 965                                                dev->dvb_ep_bulk);
 966                         usb_fill_bulk_urb(urb, udev, pipe, usb_bufs->buf[i],
 967                                           sb_size, em28xx_irq_callback, dev);
 968                 } else { /* isoc */
 969                         pipe = usb_rcvisocpipe(udev,
 970                                                mode == EM28XX_ANALOG_MODE ?
 971                                                dev->analog_ep_isoc :
 972                                                dev->dvb_ep_isoc);
 973                         usb_fill_int_urb(urb, udev, pipe, usb_bufs->buf[i],
 974                                          sb_size, em28xx_irq_callback, dev, 1);
 975                         urb->transfer_flags |= URB_ISO_ASAP;
 976                         k = 0;
 977                         for (j = 0; j < usb_bufs->num_packets; j++) {
 978                                 urb->iso_frame_desc[j].offset = k;
 979                                 urb->iso_frame_desc[j].length =
 980                                                         usb_bufs->max_pkt_size;
 981                                 k += usb_bufs->max_pkt_size;
 982                         }
 983                 }
 984
 985                 urb->number_of_packets = usb_bufs->num_packets;
 986         }
 987
 988         return 0;
 989 }
 990 EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
 991
 992 /*
 993  * Allocate URBs and start IRQ
 994  */
 995 int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
 996                          int xfer_bulk, int num_bufs, int max_pkt_size,
 997                     int packet_multiplier,
 998                     int (*urb_data_copy)(struct em28xx *dev, struct urb *urb))
 999 {
1000         struct em28xx_dmaqueue *dma_q = &dev->vidq;
1001         struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
1002         struct em28xx_usb_bufs *usb_bufs;
1003         struct usb_device *udev = interface_to_usbdev(dev->intf);
1004         int i;
1005         int rc;
1006         int alloc;
1007
1008         em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
1009
1010         dev->usb_ctl.urb_data_copy = urb_data_copy;
1011
1012         if (mode == EM28XX_DIGITAL_MODE) {
1013                 usb_bufs = &dev->usb_ctl.digital_bufs;
1014                 /* no need to free/alloc usb buffers in digital mode */
1015                 alloc = 0;
1016         } else {
1017                 usb_bufs = &dev->usb_ctl.analog_bufs;
1018                 alloc = 1;
1019         }
1020
1021         if (alloc) {
1022                 rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
1023                                        max_pkt_size, packet_multiplier);
1024                 if (rc)
1025                         return rc;
1026         }
1027
1028         if (xfer_bulk) {
1029                 rc = usb_clear_halt(udev, usb_bufs->urb[0]->pipe);
1030                 if (rc < 0) {
1031                         dev_err(&dev->intf->dev,
1032                                 "failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
1033                                rc);
1034                         em28xx_uninit_usb_xfer(dev, mode);
1035                         return rc;
1036                 }
1037         }
1038
1039         init_waitqueue_head(&dma_q->wq);
1040         init_waitqueue_head(&vbi_dma_q->wq);
1041
1042         em28xx_capture_start(dev, 1);
1043
1044         /* submit urbs and enables IRQ */
1045         for (i = 0; i < usb_bufs->num_bufs; i++) {
1046                 rc = usb_submit_urb(usb_bufs->urb[i], GFP_KERNEL);
1047                 if (rc) {
1048                         dev_err(&dev->intf->dev,
1049                                 "submit of urb %i failed (error=%i)\n", i, rc);
1050                         em28xx_uninit_usb_xfer(dev, mode);
1051                         return rc;
1052                 }
1053         }
1054
1055         return 0;
1056 }
1057 EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
1058
1059 /*
1060  * Device control list
1061  */
1062
1063 static LIST_HEAD(em28xx_devlist);
1064 static DEFINE_MUTEX(em28xx_devlist_mutex);
1065
1066 /*
1067  * Extension interface
1068  */
1069
1070 static LIST_HEAD(em28xx_extension_devlist);
1071
1072 int em28xx_register_extension(struct em28xx_ops *ops)
1073 {
1074         struct em28xx *dev = NULL;
1075
1076         mutex_lock(&em28xx_devlist_mutex);
1077         list_add_tail(&ops->next, &em28xx_extension_devlist);
1078         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1079                 if (ops->init) {
1080                         ops->init(dev);
1081                         if (dev->dev_next)
1082                                 ops->init(dev->dev_next);
1083                 }
1084         }
1085         mutex_unlock(&em28xx_devlist_mutex);
1086         pr_info("em28xx: Registered (%s) extension\n", ops->name);
1087         return 0;
1088 }
1089 EXPORT_SYMBOL(em28xx_register_extension);
1090
1091 void em28xx_unregister_extension(struct em28xx_ops *ops)
1092 {
1093         struct em28xx *dev = NULL;
1094
1095         mutex_lock(&em28xx_devlist_mutex);
1096         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1097                 if (ops->fini) {
1098                         if (dev->dev_next)
1099                                 ops->fini(dev->dev_next);
1100                         ops->fini(dev);
1101                 }
1102         }
1103         list_del(&ops->next);
1104         mutex_unlock(&em28xx_devlist_mutex);
1105         pr_info("em28xx: Removed (%s) extension\n", ops->name);
1106 }
1107 EXPORT_SYMBOL(em28xx_unregister_extension);
1108
1109 void em28xx_init_extension(struct em28xx *dev)
1110 {
1111         const struct em28xx_ops *ops = NULL;
1112
1113         mutex_lock(&em28xx_devlist_mutex);
1114         list_add_tail(&dev->devlist, &em28xx_devlist);
1115         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1116                 if (ops->init) {
1117                         ops->init(dev);
1118                         if (dev->dev_next)
1119                                 ops->init(dev->dev_next);
1120                 }
1121         }
1122         mutex_unlock(&em28xx_devlist_mutex);
1123 }
1124
1125 void em28xx_close_extension(struct em28xx *dev)
1126 {
1127         const struct em28xx_ops *ops = NULL;
1128
1129         mutex_lock(&em28xx_devlist_mutex);
1130         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1131                 if (ops->fini) {
1132                         if (dev->dev_next)
1133                                 ops->fini(dev->dev_next);
1134                         ops->fini(dev);
1135                 }
1136         }
1137         list_del(&dev->devlist);
1138         mutex_unlock(&em28xx_devlist_mutex);
1139 }
1140
1141 int em28xx_suspend_extension(struct em28xx *dev)
1142 {
1143         const struct em28xx_ops *ops = NULL;
1144
1145         dev_info(&dev->intf->dev, "Suspending extensions\n");
1146         mutex_lock(&em28xx_devlist_mutex);
1147         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1148                 if (!ops->suspend)
1149                         continue;
1150                 ops->suspend(dev);
1151                 if (dev->dev_next)
1152                         ops->suspend(dev->dev_next);
1153         }
1154         mutex_unlock(&em28xx_devlist_mutex);
1155         return 0;
1156 }
1157
1158 int em28xx_resume_extension(struct em28xx *dev)
1159 {
1160         const struct em28xx_ops *ops = NULL;
1161
1162         dev_info(&dev->intf->dev, "Resuming extensions\n");
1163         mutex_lock(&em28xx_devlist_mutex);
1164         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1165                 if (!ops->resume)
1166                         continue;
1167                 ops->resume(dev);
1168                 if (dev->dev_next)
1169                         ops->resume(dev->dev_next);
1170         }
1171         mutex_unlock(&em28xx_devlist_mutex);
1172         return 0;
1173 }