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_unlink_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         int                      period_elapsed = 0;
  79         int                      status;
  80         unsigned char            *cp;
  81         unsigned int             stride;
  82         struct snd_pcm_substream *substream;
  83         struct snd_pcm_runtime   *runtime;
  84         if (dev->adev.capture_pcm_substream) {
  85                 substream = dev->adev.capture_pcm_substream;
  86                 runtime = substream->runtime;
  87                 stride = runtime->frame_bits >> 3;
  88
  89                 for (i = 0; i < urb->number_of_packets; i++) {
  90                         int length =
  91                             urb->iso_frame_desc[i].actual_length / stride;
  92                         cp = (unsigned char *)urb->transfer_buffer +
  93                             urb->iso_frame_desc[i].offset;
  94
  95                         if (!length)
  96                                 continue;
  97
  98                         oldptr = dev->adev.hwptr_done_capture;
  99                         if (oldptr + length >= runtime->buffer_size) {
 100                                 unsigned int cnt =
 101                                     runtime->buffer_size - oldptr;
 102                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 103                                        cnt * stride);
 104                                 memcpy(runtime->dma_area, cp + cnt * stride,
 105                                        length * stride - cnt * stride);
 106                         } else {
 107                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 108                                        length * stride);
 109                         }
 110
 111                         snd_pcm_stream_lock(substream);
 112
 113                         dev->adev.hwptr_done_capture += length;
 114                         if (dev->adev.hwptr_done_capture >=
 115                             runtime->buffer_size)
 116                                 dev->adev.hwptr_done_capture -=
 117                                     runtime->buffer_size;
 118
 119                         dev->adev.capture_transfer_done += length;
 120                         if (dev->adev.capture_transfer_done >=
 121                             runtime->period_size) {
 122                                 dev->adev.capture_transfer_done -=
 123                                     runtime->period_size;
 124                                 period_elapsed = 1;
 125                         }
 126
 127                         snd_pcm_stream_unlock(substream);
 128                 }
 129                 if (period_elapsed)
 130                         snd_pcm_period_elapsed(substream);
 131         }
 132         urb->status = 0;
 133
 134         if (dev->adev.shutdown)
 135                 return;
 136
 137         status = usb_submit_urb(urb, GFP_ATOMIC);
 138         if (status < 0) {
 139                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 140                               status);
 141         }
 142         return;
 143 }
 144
 145 static int em28xx_init_audio_isoc(struct em28xx *dev)
 146 {
 147         int       i, errCode;
 148         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
 149                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 150
 151         dprintk("Starting isoc transfers\n");
 152
 153         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 154                 struct urb *urb;
 155                 int j, k;
 156
 157                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 158                 if (!dev->adev.transfer_buffer[i])
 159                         return -ENOMEM;
 160
 161                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 162                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 163                 if (!urb) {
 164                         em28xx_errdev("usb_alloc_urb failed!\n");
 165                         for (j = 0; j < i; j++) {
 166                                 usb_free_urb(dev->adev.urb[j]);
 167                                 kfree(dev->adev.transfer_buffer[j]);
 168                         }
 169                         return -ENOMEM;
 170                 }
 171
 172                 urb->dev = dev->udev;
 173                 urb->context = dev;
 174                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
 175                 urb->transfer_flags = URB_ISO_ASAP;
 176                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 177                 urb->interval = 1;
 178                 urb->complete = em28xx_audio_isocirq;
 179                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 180                 urb->transfer_buffer_length = sb_size;
 181
 182                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
 183                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 184                         urb->iso_frame_desc[j].offset = k;
 185                         urb->iso_frame_desc[j].length =
 186                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 187                 }
 188                 dev->adev.urb[i] = urb;
 189         }
 190
 191         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 192                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 193                 if (errCode) {
 194                         em28xx_isoc_audio_deinit(dev);
 195
 196                         return errCode;
 197                 }
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
 204 {
 205         dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
 206                                  "stop" : "start");
 207
 208         switch (cmd) {
 209         case EM28XX_CAPTURE_STREAM_EN:
 210                 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
 211                         dev->adev.capture_stream = STREAM_ON;
 212                         em28xx_init_audio_isoc(dev);
 213                 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
 214                         dev->adev.capture_stream = STREAM_OFF;
 215                         em28xx_isoc_audio_deinit(dev);
 216                 } else {
 217                         printk(KERN_ERR "An underrun very likely occurred. "
 218                                         "Ignoring it.\n");
 219                 }
 220                 return 0;
 221         default:
 222                 return -EINVAL;
 223         }
 224 }
 225
 226 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 227                                         size_t size)
 228 {
 229         struct snd_pcm_runtime *runtime = subs->runtime;
 230
 231         dprintk("Alocating vbuffer\n");
 232         if (runtime->dma_area) {
 233                 if (runtime->dma_bytes > size)
 234                         return 0;
 235
 236                 vfree(runtime->dma_area);
 237         }
 238         runtime->dma_area = vmalloc(size);
 239         if (!runtime->dma_area)
 240                 return -ENOMEM;
 241
 242         runtime->dma_bytes = size;
 243
 244         return 0;
 245 }
 246
 247 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 248         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 249                 SNDRV_PCM_INFO_MMAP           |
 250                 SNDRV_PCM_INFO_INTERLEAVED    |
 251                 SNDRV_PCM_INFO_MMAP_VALID,
 252
 253         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 254
 255         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 256
 257         .rate_min = 48000,
 258         .rate_max = 48000,
 259         .channels_min = 2,
 260         .channels_max = 2,
 261         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 262         .period_bytes_min = 64,         /* 12544/2, */
 263         .period_bytes_max = 12544,
 264         .periods_min = 2,
 265         .periods_max = 98,              /* 12544, */
 266 };
 267
 268 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 269 {
 270         struct em28xx *dev = snd_pcm_substream_chip(substream);
 271         struct snd_pcm_runtime *runtime = substream->runtime;
 272         int ret = 0;
 273
 274         dprintk("opening device and trying to acquire exclusive lock\n");
 275
 276         if (!dev) {
 277                 printk(KERN_ERR "BUG: em28xx can't find device struct."
 278                                 " Can't proceed with open\n");
 279                 return -ENODEV;
 280         }
 281
 282         /* Sets volume, mute, etc */
 283
 284         dev->mute = 0;
 285         mutex_lock(&dev->lock);
 286         ret = em28xx_audio_analog_set(dev);
 287         mutex_unlock(&dev->lock);
 288         if (ret < 0)
 289                 goto err;
 290
 291         runtime->hw = snd_em28xx_hw_capture;
 292         if (dev->alt == 0 && dev->adev.users == 0) {
 293                 int errCode;
 294                 dev->alt = 7;
 295                 errCode = usb_set_interface(dev->udev, 0, 7);
 296                 dprintk("changing alternate number to 7\n");
 297         }
 298
 299         dev->adev.users++;
 300
 301         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 302         dev->adev.capture_pcm_substream = substream;
 303         runtime->private_data = dev;
 304
 305         return 0;
 306 err:
 307         printk(KERN_ERR "Error while configuring em28xx mixer\n");
 308         return ret;
 309 }
 310
 311 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 312 {
 313         struct em28xx *dev = snd_pcm_substream_chip(substream);
 314         dev->adev.users--;
 315
 316         dprintk("closing device\n");
 317
 318         dev->mute = 1;
 319         mutex_lock(&dev->lock);
 320         em28xx_audio_analog_set(dev);
 321         mutex_unlock(&dev->lock);
 322
 323         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 324                 dprintk("audio users: %d\n", dev->adev.users);
 325                 dprintk("disabling audio stream!\n");
 326                 dev->adev.shutdown = 0;
 327                 dprintk("released lock\n");
 328                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 329         }
 330         return 0;
 331 }
 332
 333 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 334                                         struct snd_pcm_hw_params *hw_params)
 335 {
 336         unsigned int channels, rate, format;
 337         int ret;
 338
 339         dprintk("Setting capture parameters\n");
 340
 341         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 342                                 params_buffer_bytes(hw_params));
 343         format = params_format(hw_params);
 344         rate = params_rate(hw_params);
 345         channels = params_channels(hw_params);
 346
 347         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 348            current default is 48000hz multiplexed => 96000hz mono
 349            which shouldn't matter since analogue TV only supports mono */
 350         return 0;
 351 }
 352
 353 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 354 {
 355         struct em28xx *dev = snd_pcm_substream_chip(substream);
 356
 357         dprintk("Stop capture, if needed\n");
 358
 359         if (dev->adev.capture_stream == STREAM_ON)
 360                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 361
 362         return 0;
 363 }
 364
 365 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 366 {
 367         return 0;
 368 }
 369
 370 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 371                                       int cmd)
 372 {
 373         struct em28xx *dev = snd_pcm_substream_chip(substream);
 374
 375         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
 376                                        "start": "stop");
 377         switch (cmd) {
 378         case SNDRV_PCM_TRIGGER_START:
 379                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
 380                 return 0;
 381         case SNDRV_PCM_TRIGGER_STOP:
 382                 dev->adev.shutdown = 1;
 383                 return 0;
 384         default:
 385                 return -EINVAL;
 386         }
 387 }
 388
 389 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 390                                                     *substream)
 391 {
 392         struct em28xx *dev;
 393
 394         snd_pcm_uframes_t hwptr_done;
 395         dev = snd_pcm_substream_chip(substream);
 396         hwptr_done = dev->adev.hwptr_done_capture;
 397
 398         return hwptr_done;
 399 }
 400
 401 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 402                                              unsigned long offset)
 403 {
 404         void *pageptr = subs->runtime->dma_area + offset;
 405
 406         return vmalloc_to_page(pageptr);
 407 }
 408
 409 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 410         .open      = snd_em28xx_capture_open,
 411         .close     = snd_em28xx_pcm_close,
 412         .ioctl     = snd_pcm_lib_ioctl,
 413         .hw_params = snd_em28xx_hw_capture_params,
 414         .hw_free   = snd_em28xx_hw_capture_free,
 415         .prepare   = snd_em28xx_prepare,
 416         .trigger   = snd_em28xx_capture_trigger,
 417         .pointer   = snd_em28xx_capture_pointer,
 418         .page      = snd_pcm_get_vmalloc_page,
 419 };
 420
 421 static int em28xx_audio_init(struct em28xx *dev)
 422 {
 423         struct em28xx_audio *adev = &dev->adev;
 424         struct snd_pcm      *pcm;
 425         struct snd_card     *card;
 426         static int          devnr;
 427         int                 err;
 428
 429         if (dev->has_alsa_audio != 1) {
 430                 /* This device does not support the extension (in this case
 431                    the device is expecting the snd-usb-audio module or
 432                    doesn't have analog audio support at all) */
 433                 return 0;
 434         }
 435
 436         printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
 437                          "non standard usbaudio\n");
 438         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 439                          "Rechberger\n");
 440
 441         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
 442                               &card);
 443         if (err < 0)
 444                 return err;
 445
 446         spin_lock_init(&adev->slock);
 447         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 448         if (err < 0) {
 449                 snd_card_free(card);
 450                 return err;
 451         }
 452
 453         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 454         pcm->info_flags = 0;
 455         pcm->private_data = dev;
 456         strcpy(pcm->name, "Empia 28xx Capture");
 457         strcpy(card->driver, "Empia Em28xx Audio");
 458         strcpy(card->shortname, "Em28xx Audio");
 459         strcpy(card->longname, "Empia Em28xx Audio");
 460
 461         err = snd_card_register(card);
 462         if (err < 0) {
 463                 snd_card_free(card);
 464                 return err;
 465         }
 466         adev->sndcard = card;
 467         adev->udev = dev->udev;
 468
 469         return 0;
 470 }
 471
 472 static int em28xx_audio_fini(struct em28xx *dev)
 473 {
 474         if (dev == NULL)
 475                 return 0;
 476
 477         if (dev->has_alsa_audio != 1) {
 478                 /* This device does not support the extension (in this case
 479                    the device is expecting the snd-usb-audio module or
 480                    doesn't have analog audio support at all) */
 481                 return 0;
 482         }
 483
 484         if (dev->adev.sndcard) {
 485                 snd_card_free(dev->adev.sndcard);
 486                 dev->adev.sndcard = NULL;
 487         }
 488
 489         return 0;
 490 }
 491
 492 static struct em28xx_ops audio_ops = {
 493         .id   = EM28XX_AUDIO,
 494         .name = "Em28xx Audio Extension",
 495         .init = em28xx_audio_init,
 496         .fini = em28xx_audio_fini,
 497 };
 498
 499 static int __init em28xx_alsa_register(void)
 500 {
 501         return em28xx_register_extension(&audio_ops);
 502 }
 503
 504 static void __exit em28xx_alsa_unregister(void)
 505 {
 506         em28xx_unregister_extension(&audio_ops);
 507 }
 508
 509 MODULE_LICENSE("GPL");
 510 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 511 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 512 MODULE_DESCRIPTION("Em28xx Audio driver");
 513
 514 module_init(em28xx_alsa_register);
 515 module_exit(em28xx_alsa_unregister);