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