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

   1 /*
   2    em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8    Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include "em28xx.h"
  26
  27 #include <linux/init.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/list.h>
  30 #include <linux/module.h>
  31 #include <linux/slab.h>
  32 #include <linux/usb.h>
  33 #include <linux/vmalloc.h>
  34 #include <sound/ac97_codec.h>
  35 #include <media/v4l2-common.h>
  36
  37 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
  38                       "Markus Rechberger <mrechberger@gmail.com>, " \
  39                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
  40                       "Sascha Sommer <saschasommer@freenet.de>"
  41
  42 MODULE_AUTHOR(DRIVER_AUTHOR);
  43 MODULE_DESCRIPTION(DRIVER_DESC);
  44 MODULE_LICENSE("GPL");
  45 MODULE_VERSION(EM28XX_VERSION);
  46
  47 /* #define ENABLE_DEBUG_ISOC_FRAMES */
  48
  49 static unsigned int core_debug;
  50 module_param(core_debug, int, 0644);
  51 MODULE_PARM_DESC(core_debug, "enable debug messages [core and isoc]");
  52
  53 #define em28xx_coredbg(fmt, arg...) do {                                \
  54         if (core_debug)                                                 \
  55                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  56                            "core: %s: " fmt, __func__, ## arg);         \
  57 } while (0)
  58
  59 static unsigned int reg_debug;
  60 module_param(reg_debug, int, 0644);
  61 MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
  62
  63
  64 #define em28xx_regdbg(fmt, arg...) do {                         \
  65         if (reg_debug)                                                  \
  66                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  67                            "reg: %s: " fmt, __func__, ## arg);          \
  68 } while (0)
  69
  70 /* FIXME: don't abuse core_debug */
  71 #define em28xx_isocdbg(fmt, arg...) do {                                \
  72         if (core_debug)                                                 \
  73                 dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  74                            "core: %s: " fmt, __func__, ## arg);         \
  75 } while (0)
  76
  77 /*
  78  * em28xx_read_reg_req()
  79  * reads data from the usb device specifying bRequest
  80  */
  81 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
  82                             char *buf, int len)
  83 {
  84         int ret;
  85         struct usb_device *udev = interface_to_usbdev(dev->intf);
  86         int pipe = usb_rcvctrlpipe(udev, 0);
  87
  88         if (dev->disconnected)
  89                 return -ENODEV;
  90
  91         if (len > URB_MAX_CTRL_SIZE)
  92                 return -EINVAL;
  93
  94         mutex_lock(&dev->ctrl_urb_lock);
  95         ret = usb_control_msg(udev, pipe, req,
  96                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  97                               0x0000, reg, dev->urb_buf, len, 1000);
  98         if (ret < 0) {
  99                 em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x  failed with error %i\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, ret);
 104                 mutex_unlock(&dev->ctrl_urb_lock);
 105                 return usb_translate_errors(ret);
 106         }
 107
 108         if (len)
 109                 memcpy(buf, dev->urb_buf, len);
 110
 111         mutex_unlock(&dev->ctrl_urb_lock);
 112
 113         em28xx_regdbg("(pipe 0x%08x): IN:  %02x %02x %02x %02x %02x %02x %02x %02x <<< %*ph\n",
 114                      pipe, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 115                      req, 0, 0,
 116                      reg & 0xff, reg >> 8,
 117                      len & 0xff, len >> 8, len, buf);
 118
 119         return ret;
 120 }
 121
 122 /*
 123  * em28xx_read_reg_req()
 124  * reads data from the usb device specifying bRequest
 125  */
 126 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
 127 {
 128         int ret;
 129         u8 val;
 130
 131         ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
 132         if (ret < 0)
 133                 return ret;
 134
 135         return val;
 136 }
 137
 138 int em28xx_read_reg(struct em28xx *dev, u16 reg)
 139 {
 140         return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
 141 }
 142 EXPORT_SYMBOL_GPL(em28xx_read_reg);
 143
 144 /*
 145  * em28xx_write_regs_req()
 146  * sends data to the usb device, specifying bRequest
 147  */
 148 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
 149                           int len)
 150 {
 151         int ret;
 152         struct usb_device *udev = interface_to_usbdev(dev->intf);
 153         int pipe = usb_sndctrlpipe(udev, 0);
 154
 155         if (dev->disconnected)
 156                 return -ENODEV;
 157
 158         if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
 159                 return -EINVAL;
 160
 161         mutex_lock(&dev->ctrl_urb_lock);
 162         memcpy(dev->urb_buf, buf, len);
 163         ret = usb_control_msg(udev, pipe, req,
 164                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 165                               0x0000, reg, dev->urb_buf, len, 1000);
 166         mutex_unlock(&dev->ctrl_urb_lock);
 167
 168         if (ret < 0) {
 169                 em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph  failed with error %i\n",
 170                               pipe,
 171                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 172                               req, 0, 0,
 173                               reg & 0xff, reg >> 8,
 174                               len & 0xff, len >> 8, len, buf, ret);
 175                 return usb_translate_errors(ret);
 176         }
 177
 178         em28xx_regdbg("(pipe 0x%08x): OUT:  %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph\n",
 179                       pipe,
 180                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 181                       req, 0, 0,
 182                       reg & 0xff, reg >> 8,
 183                       len & 0xff, len >> 8, len, buf);
 184
 185         if (dev->wait_after_write)
 186                 msleep(dev->wait_after_write);
 187
 188         return ret;
 189 }
 190
 191 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
 192 {
 193         return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
 194 }
 195 EXPORT_SYMBOL_GPL(em28xx_write_regs);
 196
 197 /* Write a single register */
 198 int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
 199 {
 200         return em28xx_write_regs(dev, reg, &val, 1);
 201 }
 202 EXPORT_SYMBOL_GPL(em28xx_write_reg);
 203
 204 /*
 205  * em28xx_write_reg_bits()
 206  * sets only some bits (specified by bitmask) of a register, by first reading
 207  * the actual value
 208  */
 209 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
 210                           u8 bitmask)
 211 {
 212         int oldval;
 213         u8 newval;
 214
 215         oldval = em28xx_read_reg(dev, reg);
 216         if (oldval < 0)
 217                 return oldval;
 218
 219         newval = (((u8)oldval) & ~bitmask) | (val & bitmask);
 220
 221         return em28xx_write_regs(dev, reg, &newval, 1);
 222 }
 223 EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
 224
 225 /*
 226  * em28xx_toggle_reg_bits()
 227  * toggles/inverts the bits (specified by bitmask) of a register
 228  */
 229 int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask)
 230 {
 231         int oldval;
 232         u8 newval;
 233
 234         oldval = em28xx_read_reg(dev, reg);
 235         if (oldval < 0)
 236                 return oldval;
 237
 238         newval = (~oldval & bitmask) | (oldval & ~bitmask);
 239
 240         return em28xx_write_reg(dev, reg, newval);
 241 }
 242 EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits);
 243
 244 /*
 245  * em28xx_is_ac97_ready()
 246  * Checks if ac97 is ready
 247  */
 248 static int em28xx_is_ac97_ready(struct em28xx *dev)
 249 {
 250         unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_AC97_XFER_TIMEOUT);
 251         int ret;
 252
 253         /* Wait up to 50 ms for AC97 command to complete */
 254         while (time_is_after_jiffies(timeout)) {
 255                 ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
 256                 if (ret < 0)
 257                         return ret;
 258
 259                 if (!(ret & 0x01))
 260                         return 0;
 261                 msleep(5);
 262         }
 263
 264         dev_warn(&dev->intf->dev,
 265                  "AC97 command still being executed: not handled properly!\n");
 266         return -EBUSY;
 267 }
 268
 269 /*
 270  * em28xx_read_ac97()
 271  * write a 16 bit value to the specified AC97 address (LSB first!)
 272  */
 273 int em28xx_read_ac97(struct em28xx *dev, u8 reg)
 274 {
 275         int ret;
 276         u8 addr = (reg & 0x7f) | 0x80;
 277         __le16 val;
 278
 279         ret = em28xx_is_ac97_ready(dev);
 280         if (ret < 0)
 281                 return ret;
 282
 283         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 284         if (ret < 0)
 285                 return ret;
 286
 287         ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
 288                                            (u8 *)&val, sizeof(val));
 289
 290         if (ret < 0)
 291                 return ret;
 292         return le16_to_cpu(val);
 293 }
 294 EXPORT_SYMBOL_GPL(em28xx_read_ac97);
 295
 296 /*
 297  * em28xx_write_ac97()
 298  * write a 16 bit value to the specified AC97 address (LSB first!)
 299  */
 300 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
 301 {
 302         int ret;
 303         u8 addr = reg & 0x7f;
 304         __le16 value;
 305
 306         value = cpu_to_le16(val);
 307
 308         ret = em28xx_is_ac97_ready(dev);
 309         if (ret < 0)
 310                 return ret;
 311
 312         ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *)&value, 2);
 313         if (ret < 0)
 314                 return ret;
 315
 316         ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
 317         if (ret < 0)
 318                 return ret;
 319
 320         return 0;
 321 }
 322 EXPORT_SYMBOL_GPL(em28xx_write_ac97);
 323
 324 struct em28xx_vol_itable {
 325         enum em28xx_amux mux;
 326         u8               reg;
 327 };
 328
 329 static struct em28xx_vol_itable inputs[] = {
 330         { EM28XX_AMUX_VIDEO,    AC97_VIDEO      },
 331         { EM28XX_AMUX_LINE_IN,  AC97_LINE       },
 332         { EM28XX_AMUX_PHONE,    AC97_PHONE      },
 333         { EM28XX_AMUX_MIC,      AC97_MIC        },
 334         { EM28XX_AMUX_CD,       AC97_CD         },
 335         { EM28XX_AMUX_AUX,      AC97_AUX        },
 336         { EM28XX_AMUX_PCM_OUT,  AC97_PCM        },
 337 };
 338
 339 static int set_ac97_input(struct em28xx *dev)
 340 {
 341         int ret, i;
 342         enum em28xx_amux amux = dev->ctl_ainput;
 343
 344         /* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
 345            em28xx should point to LINE IN, while AC97 should use VIDEO
 346          */
 347         if (amux == EM28XX_AMUX_VIDEO2)
 348                 amux = EM28XX_AMUX_VIDEO;
 349
 350         /* Mute all entres but the one that were selected */
 351         for (i = 0; i < ARRAY_SIZE(inputs); i++) {
 352                 if (amux == inputs[i].mux)
 353                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
 354                 else
 355                         ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
 356
 357                 if (ret < 0)
 358                         dev_warn(&dev->intf->dev,
 359                                  "couldn't setup AC97 register %d\n",
 360                                  inputs[i].reg);
 361         }
 362         return 0;
 363 }
 364
 365 static int em28xx_set_audio_source(struct em28xx *dev)
 366 {
 367         int ret;
 368         u8 input;
 369
 370         if (dev->board.is_em2800) {
 371                 if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
 372                         input = EM2800_AUDIO_SRC_TUNER;
 373                 else
 374                         input = EM2800_AUDIO_SRC_LINE;
 375
 376                 ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
 377                 if (ret < 0)
 378                         return ret;
 379         }
 380
 381         if (dev->board.has_msp34xx)
 382                 input = EM28XX_AUDIO_SRC_TUNER;
 383         else {
 384                 switch (dev->ctl_ainput) {
 385                 case EM28XX_AMUX_VIDEO:
 386                         input = EM28XX_AUDIO_SRC_TUNER;
 387                         break;
 388                 default:
 389                         input = EM28XX_AUDIO_SRC_LINE;
 390                         break;
 391                 }
 392         }
 393
 394         if (dev->board.mute_gpio && dev->mute)
 395                 em28xx_gpio_set(dev, dev->board.mute_gpio);
 396         else
 397                 em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 398
 399         ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
 400         if (ret < 0)
 401                 return ret;
 402         msleep(5);
 403
 404         switch (dev->audio_mode.ac97) {
 405         case EM28XX_NO_AC97:
 406                 break;
 407         default:
 408                 ret = set_ac97_input(dev);
 409         }
 410
 411         return ret;
 412 }
 413
 414 struct em28xx_vol_otable {
 415         enum em28xx_aout mux;
 416         u8               reg;
 417 };
 418
 419 static const struct em28xx_vol_otable outputs[] = {
 420         { EM28XX_AOUT_MASTER, AC97_MASTER               },
 421         { EM28XX_AOUT_LINE,   AC97_HEADPHONE            },
 422         { EM28XX_AOUT_MONO,   AC97_MASTER_MONO          },
 423         { EM28XX_AOUT_LFE,    AC97_CENTER_LFE_MASTER    },
 424         { EM28XX_AOUT_SURR,   AC97_SURROUND_MASTER      },
 425 };
 426
 427 int em28xx_audio_analog_set(struct em28xx *dev)
 428 {
 429         int ret, i;
 430         u8 xclk;
 431
 432         if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE)
 433                 return 0;
 434
 435         /* It is assumed that all devices use master volume for output.
 436            It would be possible to use also line output.
 437          */
 438         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 439                 /* Mute all outputs */
 440                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 441                         ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
 442                         if (ret < 0)
 443                                 dev_warn(&dev->intf->dev,
 444                                          "couldn't setup AC97 register %d\n",
 445                                          outputs[i].reg);
 446                 }
 447         }
 448
 449         xclk = dev->board.xclk & 0x7f;
 450         if (!dev->mute)
 451                 xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
 452
 453         ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
 454         if (ret < 0)
 455                 return ret;
 456         msleep(10);
 457
 458         /* Selects the proper audio input */
 459         ret = em28xx_set_audio_source(dev);
 460
 461         /* Sets volume */
 462         if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 463                 int vol;
 464
 465                 em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
 466                 em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
 467                 em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
 468
 469                 /* LSB: left channel - both channels with the same level */
 470                 vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
 471
 472                 /* Mute device, if needed */
 473                 if (dev->mute)
 474                         vol |= 0x8000;
 475
 476                 /* Sets volume */
 477                 for (i = 0; i < ARRAY_SIZE(outputs); i++) {
 478                         if (dev->ctl_aoutput & outputs[i].mux)
 479                                 ret = em28xx_write_ac97(dev, outputs[i].reg,
 480                                                         vol);
 481                         if (ret < 0)
 482                                 dev_warn(&dev->intf->dev,
 483                                          "couldn't setup AC97 register %d\n",
 484                                          outputs[i].reg);
 485                 }
 486
 487                 if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
 488                         int sel = ac97_return_record_select(dev->ctl_aoutput);
 489
 490                         /* Use the same input for both left and right
 491                            channels */
 492                         sel |= (sel << 8);
 493
 494                         em28xx_write_ac97(dev, AC97_REC_SEL, sel);
 495                 }
 496         }
 497
 498         return ret;
 499 }
 500 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
 501
 502 int em28xx_audio_setup(struct em28xx *dev)
 503 {
 504         int vid1, vid2, feat, cfg;
 505         u32 vid = 0;
 506         u8 i2s_samplerates;
 507
 508         if (dev->chip_id == CHIP_ID_EM2870 ||
 509             dev->chip_id == CHIP_ID_EM2874 ||
 510             dev->chip_id == CHIP_ID_EM28174 ||
 511             dev->chip_id == CHIP_ID_EM28178) {
 512                 /* Digital only device - don't load any alsa module */
 513                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 514                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 515                 return 0;
 516         }
 517
 518         /* See how this device is configured */
 519         cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
 520         dev_info(&dev->intf->dev, "Config register raw data: 0x%02x\n", cfg);
 521         if (cfg < 0) { /* Register read error */
 522                 /* Be conservative */
 523                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 524         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
 525                 /* The device doesn't have vendor audio at all */
 526                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 527                 dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 528                 return 0;
 529         } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
 530                 dev->int_audio_type = EM28XX_INT_AUDIO_I2S;
 531                 if (dev->chip_id < CHIP_ID_EM2860 &&
 532                     (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 533                     EM2820_CHIPCFG_I2S_1_SAMPRATE)
 534                         i2s_samplerates = 1;
 535                 else if (dev->chip_id >= CHIP_ID_EM2860 &&
 536                          (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
 537                          EM2860_CHIPCFG_I2S_5_SAMPRATES)
 538                         i2s_samplerates = 5;
 539                 else
 540                         i2s_samplerates = 3;
 541                 dev_info(&dev->intf->dev, "I2S Audio (%d sample rate(s))\n",
 542                         i2s_samplerates);
 543                 /* Skip the code that does AC97 vendor detection */
 544                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 545                 goto init_audio;
 546         } else {
 547                 dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
 548         }
 549
 550         dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
 551
 552         vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
 553         if (vid1 < 0) {
 554                 /*
 555                  * Device likely doesn't support AC97
 556                  * Note: (some) em2800 devices without eeprom reports 0x91 on
 557                  *       CHIPCFG register, even not having an AC97 chip
 558                  */
 559                 dev_warn(&dev->intf->dev,
 560                          "AC97 chip type couldn't be determined\n");
 561                 dev->audio_mode.ac97 = EM28XX_NO_AC97;
 562                 if (dev->usb_audio_type == EM28XX_USB_AUDIO_VENDOR)
 563                         dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
 564                 dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
 565                 goto init_audio;
 566         }
 567
 568         vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
 569         if (vid2 < 0)
 570                 goto init_audio;
 571
 572         vid = vid1 << 16 | vid2;
 573         dev_warn(&dev->intf->dev, "AC97 vendor ID = 0x%08x\n", vid);
 574
 575         feat = em28xx_read_ac97(dev, AC97_RESET);
 576         if (feat < 0)
 577                 goto init_audio;
 578
 579         dev_warn(&dev->intf->dev, "AC97 features = 0x%04x\n", feat);
 580
 581         /* Try to identify what audio processor we have */
 582         if (((vid == 0xffffffff) || (vid == 0x83847650)) && (feat == 0x6a90))
 583                 dev->audio_mode.ac97 = EM28XX_AC97_EM202;
 584         else if ((vid >> 8) == 0x838476)
 585                 dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
 586
 587 init_audio:
 588         /* Reports detected AC97 processor */
 589         switch (dev->audio_mode.ac97) {
 590         case EM28XX_NO_AC97:
 591                 dev_info(&dev->intf->dev, "No AC97 audio processor\n");
 592                 break;
 593         case EM28XX_AC97_EM202:
 594                 dev_info(&dev->intf->dev,
 595                          "Empia 202 AC97 audio processor detected\n");
 596                 break;
 597         case EM28XX_AC97_SIGMATEL:
 598                 dev_info(&dev->intf->dev,
 599                          "Sigmatel audio processor detected (stac 97%02x)\n",
 600                          vid & 0xff);
 601                 break;
 602         case EM28XX_AC97_OTHER:
 603                 dev_warn(&dev->intf->dev,
 604                          "Unknown AC97 audio processor detected!\n");
 605                 break;
 606         default:
 607                 break;
 608         }
 609
 610         return em28xx_audio_analog_set(dev);
 611 }
 612 EXPORT_SYMBOL_GPL(em28xx_audio_setup);
 613
 614 const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
 615                                          enum em28xx_led_role role)
 616 {
 617         if (dev->board.leds) {
 618                 u8 k = 0;
 619
 620                 while (dev->board.leds[k].role >= 0 &&
 621                        dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
 622                         if (dev->board.leds[k].role == role)
 623                                 return &dev->board.leds[k];
 624                         k++;
 625                 }
 626         }
 627         return NULL;
 628 }
 629 EXPORT_SYMBOL_GPL(em28xx_find_led);
 630
 631 int em28xx_capture_start(struct em28xx *dev, int start)
 632 {
 633         int rc;
 634         const struct em28xx_led *led = NULL;
 635
 636         if (dev->chip_id == CHIP_ID_EM2874 ||
 637             dev->chip_id == CHIP_ID_EM2884 ||
 638             dev->chip_id == CHIP_ID_EM28174 ||
 639             dev->chip_id == CHIP_ID_EM28178) {
 640                 /* The Transport Stream Enable Register moved in em2874 */
 641                 rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
 642                                            start ?
 643                                                EM2874_TS1_CAPTURE_ENABLE : 0x00,
 644                                            EM2874_TS1_CAPTURE_ENABLE);
 645         } else {
 646                 /* FIXME: which is the best order? */
 647                 /* video registers are sampled by VREF */
 648                 rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
 649                                            start ? 0x10 : 0x00, 0x10);
 650                 if (rc < 0)
 651                         return rc;
 652
 653                 if (start) {
 654                         if (dev->board.is_webcam)
 655                                 rc = em28xx_write_reg(dev, 0x13, 0x0c);
 656
 657                         /* Enable video capture */
 658                         rc = em28xx_write_reg(dev, 0x48, 0x00);
 659                         if (rc < 0)
 660                                 return rc;
 661
 662                         if (dev->mode == EM28XX_ANALOG_MODE)
 663                                 rc = em28xx_write_reg(dev,
 664                                                       EM28XX_R12_VINENABLE,
 665                                                       0x67);
 666                         else
 667                                 rc = em28xx_write_reg(dev,
 668                                                       EM28XX_R12_VINENABLE,
 669                                                       0x37);
 670                         if (rc < 0)
 671                                 return rc;
 672
 673                         msleep(6);
 674                 } else {
 675                         /* disable video capture */
 676                         rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
 677                 }
 678         }
 679
 680         if (dev->mode == EM28XX_ANALOG_MODE)
 681                 led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
 682         else
 683                 led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING);
 684
 685         if (led)
 686                 em28xx_write_reg_bits(dev, led->gpio_reg,
 687                                       (!start ^ led->inverted) ?
 688                                       ~led->gpio_mask : led->gpio_mask,
 689                                       led->gpio_mask);
 690
 691         return rc;
 692 }
 693
 694 int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
 695 {
 696         int rc = 0;
 697
 698         if (!gpio)
 699                 return rc;
 700
 701         if (dev->mode != EM28XX_SUSPEND) {
 702                 em28xx_write_reg(dev, 0x48, 0x00);
 703                 if (dev->mode == EM28XX_ANALOG_MODE)
 704                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
 705                 else
 706                         em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
 707                 msleep(6);
 708         }
 709
 710         /* Send GPIO reset sequences specified at board entry */
 711         while (gpio->sleep >= 0) {
 712                 if (gpio->reg >= 0) {
 713                         rc = em28xx_write_reg_bits(dev,
 714                                                    gpio->reg,
 715                                                    gpio->val,
 716                                                    gpio->mask);
 717                         if (rc < 0)
 718                                 return rc;
 719                 }
 720                 if (gpio->sleep > 0)
 721                         msleep(gpio->sleep);
 722
 723                 gpio++;
 724         }
 725         return rc;
 726 }
 727 EXPORT_SYMBOL_GPL(em28xx_gpio_set);
 728
 729 int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
 730 {
 731         if (dev->mode == set_mode)
 732                 return 0;
 733
 734         if (set_mode == EM28XX_SUSPEND) {
 735                 dev->mode = set_mode;
 736
 737                 /* FIXME: add suspend support for ac97 */
 738
 739                 return em28xx_gpio_set(dev, dev->board.suspend_gpio);
 740         }
 741
 742         dev->mode = set_mode;
 743
 744         if (dev->mode == EM28XX_DIGITAL_MODE)
 745                 return em28xx_gpio_set(dev, dev->board.dvb_gpio);
 746         else
 747                 return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
 748 }
 749 EXPORT_SYMBOL_GPL(em28xx_set_mode);
 750
 751 /* ------------------------------------------------------------------
 752         URB control
 753    ------------------------------------------------------------------*/
 754
 755 /*
 756  * URB completion handler for isoc/bulk transfers
 757  */
 758 static void em28xx_irq_callback(struct urb *urb)
 759 {
 760         struct em28xx *dev = urb->context;
 761         int i;
 762
 763         switch (urb->status) {
 764         case 0:             /* success */
 765         case -ETIMEDOUT:    /* NAK */
 766                 break;
 767         case -ECONNRESET:   /* kill */
 768         case -ENOENT:
 769         case -ESHUTDOWN:
 770                 return;
 771         default:            /* error */
 772                 em28xx_isocdbg("urb completition error %d.\n", urb->status);
 773                 break;
 774         }
 775
 776         /* Copy data from URB */
 777         spin_lock(&dev->slock);
 778         dev->usb_ctl.urb_data_copy(dev, urb);
 779         spin_unlock(&dev->slock);
 780
 781         /* Reset urb buffers */
 782         for (i = 0; i < urb->number_of_packets; i++) {
 783                 /* isoc only (bulk: number_of_packets = 0) */
 784                 urb->iso_frame_desc[i].status = 0;
 785                 urb->iso_frame_desc[i].actual_length = 0;
 786         }
 787         urb->status = 0;
 788
 789         urb->status = usb_submit_urb(urb, GFP_ATOMIC);
 790         if (urb->status) {
 791                 em28xx_isocdbg("urb resubmit failed (error=%i)\n",
 792                                urb->status);
 793         }
 794 }
 795
 796 /*
 797  * Stop and Deallocate URBs
 798  */
 799 void em28xx_uninit_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
 800 {
 801         struct urb *urb;
 802         struct em28xx_usb_bufs *usb_bufs;
 803         struct usb_device *udev = interface_to_usbdev(dev->intf);
 804         int i;
 805
 806         em28xx_isocdbg("em28xx: called em28xx_uninit_usb_xfer in mode %d\n",
 807                        mode);
 808
 809         if (mode == EM28XX_DIGITAL_MODE)
 810                 usb_bufs = &dev->usb_ctl.digital_bufs;
 811         else
 812                 usb_bufs = &dev->usb_ctl.analog_bufs;
 813
 814         for (i = 0; i < usb_bufs->num_bufs; i++) {
 815                 urb = usb_bufs->urb[i];
 816                 if (urb) {
 817                         if (!irqs_disabled())
 818                                 usb_kill_urb(urb);
 819                         else
 820                                 usb_unlink_urb(urb);
 821
 822                         if (usb_bufs->transfer_buffer[i]) {
 823                                 usb_free_coherent(udev,
 824                                                   urb->transfer_buffer_length,
 825                                                   usb_bufs->transfer_buffer[i],
 826                                                   urb->transfer_dma);
 827                         }
 828                         usb_free_urb(urb);
 829                         usb_bufs->urb[i] = NULL;
 830                 }
 831                 usb_bufs->transfer_buffer[i] = NULL;
 832         }
 833
 834         kfree(usb_bufs->urb);
 835         kfree(usb_bufs->transfer_buffer);
 836
 837         usb_bufs->urb = NULL;
 838         usb_bufs->transfer_buffer = NULL;
 839         usb_bufs->num_bufs = 0;
 840
 841         em28xx_capture_start(dev, 0);
 842 }
 843 EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
 844
 845 /*
 846  * Stop URBs
 847  */
 848 void em28xx_stop_urbs(struct em28xx *dev)
 849 {
 850         int i;
 851         struct urb *urb;
 852         struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
 853
 854         em28xx_isocdbg("em28xx: called em28xx_stop_urbs\n");
 855
 856         for (i = 0; i < isoc_bufs->num_bufs; i++) {
 857                 urb = isoc_bufs->urb[i];
 858                 if (urb) {
 859                         if (!irqs_disabled())
 860                                 usb_kill_urb(urb);
 861                         else
 862                                 usb_unlink_urb(urb);
 863                 }
 864         }
 865
 866         em28xx_capture_start(dev, 0);
 867 }
 868 EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
 869
 870 /*
 871  * Allocate URBs
 872  */
 873 int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
 874                       int num_bufs, int max_pkt_size, int packet_multiplier)
 875 {
 876         struct em28xx_usb_bufs *usb_bufs;
 877         struct urb *urb;
 878         struct usb_device *udev = interface_to_usbdev(dev->intf);
 879         int i;
 880         int sb_size, pipe;
 881         int j, k;
 882
 883         em28xx_isocdbg("em28xx: called em28xx_alloc_isoc in mode %d\n", mode);
 884
 885         /* Check mode and if we have an endpoint for the selected
 886            transfer type, select buffer                          */
 887         if (mode == EM28XX_DIGITAL_MODE) {
 888                 if ((xfer_bulk && !dev->dvb_ep_bulk) ||
 889                     (!xfer_bulk && !dev->dvb_ep_isoc)) {
 890                         dev_err(&dev->intf->dev,
 891                                 "no endpoint for DVB mode and transfer type %d\n",
 892                                 xfer_bulk > 0);
 893                         return -EINVAL;
 894                 }
 895                 usb_bufs = &dev->usb_ctl.digital_bufs;
 896         } else if (mode == EM28XX_ANALOG_MODE) {
 897                 if ((xfer_bulk && !dev->analog_ep_bulk) ||
 898                     (!xfer_bulk && !dev->analog_ep_isoc)) {
 899                         dev_err(&dev->intf->dev,
 900                                 "no endpoint for analog mode and transfer type %d\n",
 901                                 xfer_bulk > 0);
 902                         return -EINVAL;
 903                 }
 904                 usb_bufs = &dev->usb_ctl.analog_bufs;
 905         } else {
 906                 dev_err(&dev->intf->dev, "invalid mode selected\n");
 907                 return -EINVAL;
 908         }
 909
 910         /* De-allocates all pending stuff */
 911         em28xx_uninit_usb_xfer(dev, mode);
 912
 913         usb_bufs->num_bufs = num_bufs;
 914
 915         usb_bufs->urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
 916         if (!usb_bufs->urb)
 917                 return -ENOMEM;
 918
 919         usb_bufs->transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
 920                                              GFP_KERNEL);
 921         if (!usb_bufs->transfer_buffer) {
 922                 kfree(usb_bufs->urb);
 923                 return -ENOMEM;
 924         }
 925
 926         usb_bufs->max_pkt_size = max_pkt_size;
 927         if (xfer_bulk)
 928                 usb_bufs->num_packets = 0;
 929         else
 930                 usb_bufs->num_packets = packet_multiplier;
 931         dev->usb_ctl.vid_buf = NULL;
 932         dev->usb_ctl.vbi_buf = NULL;
 933
 934         sb_size = packet_multiplier * usb_bufs->max_pkt_size;
 935
 936         /* allocate urbs and transfer buffers */
 937         for (i = 0; i < usb_bufs->num_bufs; i++) {
 938                 urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
 939                 if (!urb) {
 940                         em28xx_uninit_usb_xfer(dev, mode);
 941                         return -ENOMEM;
 942                 }
 943                 usb_bufs->urb[i] = urb;
 944
 945                 usb_bufs->transfer_buffer[i] = usb_alloc_coherent(udev,
 946                         sb_size, GFP_KERNEL, &urb->transfer_dma);
 947                 if (!usb_bufs->transfer_buffer[i]) {
 948                         dev_err(&dev->intf->dev,
 949                                 "unable to allocate %i bytes for transfer buffer %i%s\n",
 950                                sb_size, i,
 951                                in_interrupt() ? " while in int" : "");
 952                         em28xx_uninit_usb_xfer(dev, mode);
 953                         return -ENOMEM;
 954                 }
 955                 memset(usb_bufs->transfer_buffer[i], 0, sb_size);
 956
 957                 if (xfer_bulk) { /* bulk */
 958                         pipe = usb_rcvbulkpipe(udev,
 959                                                mode == EM28XX_ANALOG_MODE ?
 960                                                dev->analog_ep_bulk :
 961                                                dev->dvb_ep_bulk);
 962                         usb_fill_bulk_urb(urb, udev, pipe,
 963                                           usb_bufs->transfer_buffer[i], sb_size,
 964                                           em28xx_irq_callback, dev);
 965                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 966                 } else { /* isoc */
 967                         pipe = usb_rcvisocpipe(udev,
 968                                                mode == EM28XX_ANALOG_MODE ?
 969                                                dev->analog_ep_isoc :
 970                                                dev->dvb_ep_isoc);
 971                         usb_fill_int_urb(urb, udev, pipe,
 972                                          usb_bufs->transfer_buffer[i], sb_size,
 973                                          em28xx_irq_callback, dev, 1);
 974                         urb->transfer_flags = URB_ISO_ASAP |
 975                                               URB_NO_TRANSFER_DMA_MAP;
 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 em28xx_init_usb_xfer in mode %d\n",
1009                        mode);
1010
1011         dev->usb_ctl.urb_data_copy = urb_data_copy;
1012
1013         if (mode == EM28XX_DIGITAL_MODE) {
1014                 usb_bufs = &dev->usb_ctl.digital_bufs;
1015                 /* no need to free/alloc usb buffers in digital mode */
1016                 alloc = 0;
1017         } else {
1018                 usb_bufs = &dev->usb_ctl.analog_bufs;
1019                 alloc = 1;
1020         }
1021
1022         if (alloc) {
1023                 rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
1024                                        max_pkt_size, packet_multiplier);
1025                 if (rc)
1026                         return rc;
1027         }
1028
1029         if (xfer_bulk) {
1030                 rc = usb_clear_halt(udev, usb_bufs->urb[0]->pipe);
1031                 if (rc < 0) {
1032                         dev_err(&dev->intf->dev,
1033                                 "failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
1034                                rc);
1035                         em28xx_uninit_usb_xfer(dev, mode);
1036                         return rc;
1037                 }
1038         }
1039
1040         init_waitqueue_head(&dma_q->wq);
1041         init_waitqueue_head(&vbi_dma_q->wq);
1042
1043         em28xx_capture_start(dev, 1);
1044
1045         /* submit urbs and enables IRQ */
1046         for (i = 0; i < usb_bufs->num_bufs; i++) {
1047                 rc = usb_submit_urb(usb_bufs->urb[i], GFP_ATOMIC);
1048                 if (rc) {
1049                         dev_err(&dev->intf->dev,
1050                                 "submit of urb %i failed (error=%i)\n", i, rc);
1051                         em28xx_uninit_usb_xfer(dev, mode);
1052                         return rc;
1053                 }
1054         }
1055
1056         return 0;
1057 }
1058 EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
1059
1060 /*
1061  * Device control list
1062  */
1063
1064 static LIST_HEAD(em28xx_devlist);
1065 static DEFINE_MUTEX(em28xx_devlist_mutex);
1066
1067 /*
1068  * Extension interface
1069  */
1070
1071 static LIST_HEAD(em28xx_extension_devlist);
1072
1073 int em28xx_register_extension(struct em28xx_ops *ops)
1074 {
1075         struct em28xx *dev = NULL;
1076
1077         mutex_lock(&em28xx_devlist_mutex);
1078         list_add_tail(&ops->next, &em28xx_extension_devlist);
1079         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1080                 ops->init(dev);
1081         }
1082         mutex_unlock(&em28xx_devlist_mutex);
1083         pr_info("em28xx: Registered (%s) extension\n", ops->name);
1084         return 0;
1085 }
1086 EXPORT_SYMBOL(em28xx_register_extension);
1087
1088 void em28xx_unregister_extension(struct em28xx_ops *ops)
1089 {
1090         struct em28xx *dev = NULL;
1091
1092         mutex_lock(&em28xx_devlist_mutex);
1093         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1094                 ops->fini(dev);
1095         }
1096         list_del(&ops->next);
1097         mutex_unlock(&em28xx_devlist_mutex);
1098         pr_info("em28xx: Removed (%s) extension\n", ops->name);
1099 }
1100 EXPORT_SYMBOL(em28xx_unregister_extension);
1101
1102 void em28xx_init_extension(struct em28xx *dev)
1103 {
1104         const struct em28xx_ops *ops = NULL;
1105
1106         mutex_lock(&em28xx_devlist_mutex);
1107         list_add_tail(&dev->devlist, &em28xx_devlist);
1108         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1109                 if (ops->init)
1110                         ops->init(dev);
1111         }
1112         mutex_unlock(&em28xx_devlist_mutex);
1113 }
1114
1115 void em28xx_close_extension(struct em28xx *dev)
1116 {
1117         const struct em28xx_ops *ops = NULL;
1118
1119         mutex_lock(&em28xx_devlist_mutex);
1120         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1121                 if (ops->fini)
1122                         ops->fini(dev);
1123         }
1124         list_del(&dev->devlist);
1125         mutex_unlock(&em28xx_devlist_mutex);
1126 }
1127
1128 int em28xx_suspend_extension(struct em28xx *dev)
1129 {
1130         const struct em28xx_ops *ops = NULL;
1131
1132         dev_info(&dev->intf->dev, "Suspending extensions\n");
1133         mutex_lock(&em28xx_devlist_mutex);
1134         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1135                 if (ops->suspend)
1136                         ops->suspend(dev);
1137         }
1138         mutex_unlock(&em28xx_devlist_mutex);
1139         return 0;
1140 }
1141
1142 int em28xx_resume_extension(struct em28xx *dev)
1143 {
1144         const struct em28xx_ops *ops = NULL;
1145
1146         dev_info(&dev->intf->dev, "Resuming extensions\n");
1147         mutex_lock(&em28xx_devlist_mutex);
1148         list_for_each_entry(ops, &em28xx_extension_devlist, next) {
1149                 if (ops->resume)
1150                         ops->resume(dev);
1151         }
1152         mutex_unlock(&em28xx_devlist_mutex);
1153         return 0;
1154 }