drivers/media/video/em28xx/em28xx-audio.c

   1 /*
   2  *  Empiatech em28x1 audio extension
   3  *
   4  *  Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
   5  *
   6  *  Copyright (C) 2007 Mauro Carvalho Chehab <mchehab@infradead.org>
   7  *      - Port to work with the in-kernel driver
   8  *      - Several cleanups
   9  *
  10  *  This driver is based on my previous au600 usb pstn audio driver
  11  *  and inherits all the copyrights
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software
  25  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/usb.h>
  30 #include <linux/init.h>
  31 #include <linux/sound.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/soundcard.h>
  34 #include <linux/slab.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/module.h>
  38 #include <sound/core.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include <sound/info.h>
  42 #include <sound/initval.h>
  43 #include <sound/control.h>
  44 #include <media/v4l2-common.h>
  45 #include "em28xx.h"
  46
  47 static int debug;
  48 module_param(debug, int, 0644);
  49 MODULE_PARM_DESC(debug, "activates debug info");
  50
  51 #define dprintk(fmt, arg...) do {                                       \
  52             if (debug)                                                  \
  53                 printk(KERN_INFO "em28xx-audio %s: " fmt,               \
  54                                   __func__, ##arg);             \
  55         } while (0)
  56
  57 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  58
  59 static int em28xx_isoc_audio_deinit(struct em28xx *dev)
  60 {
  61         int i;
  62
  63         dprintk("Stopping isoc\n");
  64         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
  65                 usb_kill_urb(dev->adev->urb[i]);
  66                 usb_free_urb(dev->adev->urb[i]);
  67                 dev->adev->urb[i] = NULL;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static void em28xx_audio_isocirq(struct urb *urb)
  74 {
  75         struct em28xx            *dev = urb->context;
  76         int                      i;
  77         unsigned int             oldptr;
  78 #ifdef NO_PCM_LOCK
  79         unsigned long            flags;
  80 #endif
  81         int                      period_elapsed = 0;
  82         int                      status;
  83         unsigned char            *cp;
  84         unsigned int             stride;
  85         struct snd_pcm_substream *substream;
  86         struct snd_pcm_runtime   *runtime;
  87         if (dev->adev->capture_pcm_substream) {
  88                 substream = dev->adev->capture_pcm_substream;
  89                 runtime = substream->runtime;
  90                 stride = runtime->frame_bits >> 3;
  91
  92                 for (i = 0; i < urb->number_of_packets; i++) {
  93                         int length =
  94                             urb->iso_frame_desc[i].actual_length / stride;
  95                         cp = (unsigned char *)urb->transfer_buffer +
  96                             urb->iso_frame_desc[i].offset;
  97
  98                         if (!length)
  99                                 continue;
 100
 101 #ifdef NO_PCM_LOCK
 102                         spin_lock_irqsave(&dev->adev->slock, flags);
 103 #endif
 104                         oldptr = dev->adev->hwptr_done_capture;
 105                         if (oldptr + length >= runtime->buffer_size) {
 106                                 unsigned int cnt =
 107                                     runtime->buffer_size - oldptr;
 108                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 109                                        cnt * stride);
 110                                 memcpy(runtime->dma_area, cp + cnt * stride,
 111                                        length * stride - cnt * stride);
 112                         } else {
 113                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 114                                        length * stride);
 115                         }
 116
 117 #ifndef NO_PCM_LOCK
 118                         snd_pcm_stream_lock(substream);
 119 #endif
 120
 121                         dev->adev->hwptr_done_capture += length;
 122                         if (dev->adev->hwptr_done_capture >=
 123                             runtime->buffer_size)
 124                                 dev->adev->hwptr_done_capture -=
 125                                     runtime->buffer_size;
 126
 127                         dev->adev->capture_transfer_done += length;
 128                         if (dev->adev->capture_transfer_done >=
 129                             runtime->period_size) {
 130                                 dev->adev->capture_transfer_done -=
 131                                     runtime->period_size;
 132                                 period_elapsed = 1;
 133                         }
 134
 135 #ifdef NO_PCM_LOCK
 136                         spin_unlock_irqrestore(&dev->adev->slock, flags);
 137 #else
 138                         snd_pcm_stream_unlock(substream);
 139 #endif
 140                 }
 141                 if (period_elapsed)
 142                         snd_pcm_period_elapsed(substream);
 143         }
 144         urb->status = 0;
 145
 146         if (dev->adev->shutdown)
 147                 return;
 148
 149         status = usb_submit_urb(urb, GFP_ATOMIC);
 150         if (status < 0) {
 151                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 152                               status);
 153         }
 154         return;
 155 }
 156
 157 static int em28xx_init_audio_isoc(struct em28xx *dev)
 158 {
 159         int       i, errCode;
 160         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
 161                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 162
 163         dprintk("Starting isoc transfers\n");
 164
 165         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 166                 struct urb *urb;
 167                 int j, k;
 168
 169                 dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 170                 if (!dev->adev->transfer_buffer[i])
 171                         return -ENOMEM;
 172
 173                 memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
 174                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 175                 if (!urb) {
 176                         em28xx_errdev("usb_alloc_urb failed!\n");
 177                         for (j = 0; j < i; j++) {
 178                                 usb_free_urb(dev->adev->urb[j]);
 179                                 kfree(dev->adev->transfer_buffer[j]);
 180                         }
 181                         return -ENOMEM;
 182                 }
 183
 184                 urb->dev = dev->udev;
 185                 urb->context = dev;
 186                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
 187                 urb->transfer_flags = URB_ISO_ASAP;
 188                 urb->transfer_buffer = dev->adev->transfer_buffer[i];
 189                 urb->interval = 1;
 190                 urb->complete = em28xx_audio_isocirq;
 191                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 192                 urb->transfer_buffer_length = sb_size;
 193
 194                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
 195                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 196                         urb->iso_frame_desc[j].offset = k;
 197                         urb->iso_frame_desc[j].length =
 198                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 199                 }
 200                 dev->adev->urb[i] = urb;
 201         }
 202
 203         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 204                 errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
 205                 if (errCode) {
 206                         em28xx_isoc_audio_deinit(dev);
 207
 208                         return errCode;
 209                 }
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
 216 {
 217         dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
 218                                  "stop" : "start");
 219
 220         switch (cmd) {
 221         case EM28XX_CAPTURE_STREAM_EN:
 222                 if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
 223                         dev->adev->capture_stream = STREAM_ON;
 224                         em28xx_init_audio_isoc(dev);
 225                 } else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
 226                         dev->adev->capture_stream = STREAM_OFF;
 227                         em28xx_isoc_audio_deinit(dev);
 228                 } else {
 229                         printk(KERN_ERR "An underrun very likely occurred. "
 230                                         "Ignoring it.\n");
 231                 }
 232                 return 0;
 233         default:
 234                 return -EINVAL;
 235         }
 236 }
 237
 238 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 239                                         size_t size)
 240 {
 241         struct snd_pcm_runtime *runtime = subs->runtime;
 242
 243         dprintk("Alocating vbuffer\n");
 244         if (runtime->dma_area) {
 245                 if (runtime->dma_bytes > size)
 246                         return 0;
 247
 248                 vfree(runtime->dma_area);
 249         }
 250         runtime->dma_area = vmalloc(size);
 251         if (!runtime->dma_area)
 252                 return -ENOMEM;
 253
 254         runtime->dma_bytes = size;
 255
 256         return 0;
 257 }
 258
 259 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 260         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 261                 SNDRV_PCM_INFO_MMAP           |
 262                 SNDRV_PCM_INFO_INTERLEAVED    |
 263                 SNDRV_PCM_INFO_MMAP_VALID,
 264
 265         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 266
 267         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 268
 269         .rate_min = 48000,
 270         .rate_max = 48000,
 271         .channels_min = 2,
 272         .channels_max = 2,
 273         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 274         .period_bytes_min = 64,         /* 12544/2, */
 275         .period_bytes_max = 12544,
 276         .periods_min = 2,
 277         .periods_max = 98,              /* 12544, */
 278 };
 279
 280 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 281 {
 282         struct em28xx *dev = snd_pcm_substream_chip(substream);
 283         struct snd_pcm_runtime *runtime = substream->runtime;
 284         int ret = 0;
 285
 286         dprintk("opening device and trying to acquire exclusive lock\n");
 287
 288         if (!dev) {
 289                 printk(KERN_ERR "BUG: em28xx can't find device struct."
 290                                 " Can't proceed with open\n");
 291                 return -ENODEV;
 292         }
 293
 294         /* Sets volume, mute, etc */
 295
 296         dev->mute = 0;
 297         mutex_lock(&dev->lock);
 298         ret = em28xx_audio_analog_set(dev);
 299         mutex_unlock(&dev->lock);
 300         if (ret < 0)
 301                 goto err;
 302
 303         runtime->hw = snd_em28xx_hw_capture;
 304         if (dev->alt == 0 && dev->adev->users == 0) {
 305                 int errCode;
 306                 dev->alt = 7;
 307                 errCode = usb_set_interface(dev->udev, 0, 7);
 308                 dprintk("changing alternate number to 7\n");
 309         }
 310
 311         dev->adev->users++;
 312
 313         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 314         dev->adev->capture_pcm_substream = substream;
 315         runtime->private_data = dev;
 316
 317         return 0;
 318 err:
 319         printk(KERN_ERR "Error while configuring em28xx mixer\n");
 320         return ret;
 321 }
 322
 323 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 324 {
 325         struct em28xx *dev = snd_pcm_substream_chip(substream);
 326         dev->adev->users--;
 327
 328         dprintk("closing device\n");
 329
 330         dev->mute = 1;
 331         mutex_lock(&dev->lock);
 332         em28xx_audio_analog_set(dev);
 333         mutex_unlock(&dev->lock);
 334
 335         if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
 336                 dprintk("audio users: %d\n", dev->adev->users);
 337                 dprintk("disabling audio stream!\n");
 338                 dev->adev->shutdown = 0;
 339                 dprintk("released lock\n");
 340                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 341         }
 342         return 0;
 343 }
 344
 345 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 346                                         struct snd_pcm_hw_params *hw_params)
 347 {
 348         unsigned int channels, rate, format;
 349         int ret;
 350
 351         dprintk("Setting capture parameters\n");
 352
 353         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 354                                 params_buffer_bytes(hw_params));
 355         format = params_format(hw_params);
 356         rate = params_rate(hw_params);
 357         channels = params_channels(hw_params);
 358
 359         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 360            current default is 48000hz multiplexed => 96000hz mono
 361            which shouldn't matter since analogue TV only supports mono */
 362         return 0;
 363 }
 364
 365 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 366 {
 367         struct em28xx *dev = snd_pcm_substream_chip(substream);
 368
 369         dprintk("Stop capture, if needed\n");
 370
 371         if (dev->adev->capture_stream == STREAM_ON)
 372                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 373
 374         return 0;
 375 }
 376
 377 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 378 {
 379         return 0;
 380 }
 381
 382 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 383                                       int cmd)
 384 {
 385         struct em28xx *dev = snd_pcm_substream_chip(substream);
 386
 387         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
 388                                        "start": "stop");
 389         switch (cmd) {
 390         case SNDRV_PCM_TRIGGER_START:
 391                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
 392                 return 0;
 393         case SNDRV_PCM_TRIGGER_STOP:
 394                 dev->adev->shutdown = 1;
 395                 return 0;
 396         default:
 397                 return -EINVAL;
 398         }
 399 }
 400
 401 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 402                                                     *substream)
 403 {
 404         struct em28xx *dev;
 405
 406         snd_pcm_uframes_t hwptr_done;
 407         dev = snd_pcm_substream_chip(substream);
 408         hwptr_done = dev->adev->hwptr_done_capture;
 409
 410         return hwptr_done;
 411 }
 412
 413 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 414                                              unsigned long offset)
 415 {
 416         void *pageptr = subs->runtime->dma_area + offset;
 417
 418         return vmalloc_to_page(pageptr);
 419 }
 420
 421 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 422         .open      = snd_em28xx_capture_open,
 423         .close     = snd_em28xx_pcm_close,
 424         .ioctl     = snd_pcm_lib_ioctl,
 425         .hw_params = snd_em28xx_hw_capture_params,
 426         .hw_free   = snd_em28xx_hw_capture_free,
 427         .prepare   = snd_em28xx_prepare,
 428         .trigger   = snd_em28xx_capture_trigger,
 429         .pointer   = snd_em28xx_capture_pointer,
 430         .page      = snd_pcm_get_vmalloc_page,
 431 };
 432
 433 static int em28xx_audio_init(struct em28xx *dev)
 434 {
 435         struct em28xx_audio *adev;
 436         struct snd_pcm      *pcm;
 437         struct snd_card     *card;
 438         static int          devnr;
 439         int                 ret, err;
 440
 441         if (dev->has_audio_class) {
 442                 /* This device does not support the extension (in this case
 443                    the device is expecting the snd-usb-audio module */
 444                 return 0;
 445         }
 446
 447         printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
 448                          "non standard usbaudio\n");
 449         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 450                          "Rechberger\n");
 451
 452         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
 453         if (!adev) {
 454                 printk(KERN_ERR "em28xx-audio.c: out of memory\n");
 455                 return -1;
 456         }
 457         card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
 458         if (card == NULL) {
 459                 kfree(adev);
 460                 return -ENOMEM;
 461         }
 462
 463         spin_lock_init(&adev->slock);
 464         ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 465         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 466         pcm->info_flags = 0;
 467         pcm->private_data = dev;
 468         strcpy(pcm->name, "Empia 28xx Capture");
 469         strcpy(card->driver, "Empia Em28xx Audio");
 470         strcpy(card->shortname, "Em28xx Audio");
 471         strcpy(card->longname, "Empia Em28xx Audio");
 472
 473         err = snd_card_register(card);
 474         if (err < 0) {
 475                 snd_card_free(card);
 476                 return -ENOMEM;
 477         }
 478         adev->sndcard = card;
 479         adev->udev = dev->udev;
 480         dev->adev = adev;
 481
 482         return 0;
 483 }
 484
 485 static int em28xx_audio_fini(struct em28xx *dev)
 486 {
 487         if (dev == NULL)
 488                 return 0;
 489
 490         if (dev->has_audio_class) {
 491                 /* This device does not support the extension (in this case
 492                    the device is expecting the snd-usb-audio module */
 493                 return 0;
 494         }
 495
 496         if (dev->adev) {
 497                 snd_card_free(dev->adev->sndcard);
 498                 kfree(dev->adev);
 499                 dev->adev = NULL;
 500         }
 501
 502         return 0;
 503 }
 504
 505 static struct em28xx_ops audio_ops = {
 506         .id   = EM28XX_AUDIO,
 507         .name = "Em28xx Audio Extension",
 508         .init = em28xx_audio_init,
 509         .fini = em28xx_audio_fini,
 510 };
 511
 512 static int __init em28xx_alsa_register(void)
 513 {
 514         return em28xx_register_extension(&audio_ops);
 515 }
 516
 517 static void __exit em28xx_alsa_unregister(void)
 518 {
 519         em28xx_unregister_extension(&audio_ops);
 520 }
 521
 522 MODULE_LICENSE("GPL");
 523 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 524 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 525 MODULE_DESCRIPTION("Em28xx Audio driver");
 526
 527 module_init(em28xx_alsa_register);
 528 module_exit(em28xx_alsa_unregister);