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