git.oblomov.eu Git - linux-2.6/blob - 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/driver.h>
  39 #include <sound/core.h>
  40 #include <sound/pcm.h>
  41 #include <sound/pcm_params.h>
  42 #include <sound/info.h>
  43 #include <sound/initval.h>
  44 #include <sound/control.h>
  45 #include <media/v4l2-common.h>
  46 #include "em28xx.h"
  47
  48 static int debug;
  49 module_param(debug, int, 0644);
  50 MODULE_PARM_DESC(debug, "activates debug info");
  51
  52 #define dprintk(fmt, arg...) do {                                       \
  53             if (debug)                                                  \
  54                 printk(KERN_INFO "em28xx-audio %s: " fmt,               \
  55                                   __FUNCTION__, ##arg);                 \
  56         } while (0)
  57
  58 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  59
  60 static int em28xx_isoc_audio_deinit(struct em28xx *dev)
  61 {
  62         int i;
  63
  64         dprintk("Stopping isoc\n");
  65         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
  66                 usb_kill_urb(dev->adev->urb[i]);
  67                 usb_free_urb(dev->adev->urb[i]);
  68                 dev->adev->urb[i] = NULL;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static void em28xx_audio_isocirq(struct urb *urb)
  75 {
  76         struct em28xx            *dev = urb->context;
  77         int                      i;
  78         unsigned int             oldptr;
  79         unsigned long            flags;
  80         int                      period_elapsed = 0;
  81         int                      status;
  82         unsigned char            *cp;
  83         unsigned int             stride;
  84         struct snd_pcm_substream *substream;
  85         struct snd_pcm_runtime   *runtime;
  86         if (dev->adev->capture_pcm_substream) {
  87                 substream = dev->adev->capture_pcm_substream;
  88                 runtime = substream->runtime;
  89                 stride = runtime->frame_bits >> 3;
  90
  91                 for (i = 0; i < urb->number_of_packets; i++) {
  92                         int length =
  93                             urb->iso_frame_desc[i].actual_length / stride;
  94                         cp = (unsigned char *)urb->transfer_buffer +
  95                             urb->iso_frame_desc[i].offset;
  96
  97                         if (!length)
  98                                 continue;
  99
 100                         spin_lock_irqsave(&dev->adev->slock, flags);
 101
 102                         oldptr = dev->adev->hwptr_done_capture;
 103                         dev->adev->hwptr_done_capture += length;
 104                         if (dev->adev->hwptr_done_capture >=
 105                             runtime->buffer_size)
 106                                 dev->adev->hwptr_done_capture -=
 107                                     runtime->buffer_size;
 108
 109                         dev->adev->capture_transfer_done += length;
 110                         if (dev->adev->capture_transfer_done >=
 111                             runtime->period_size) {
 112                                 dev->adev->capture_transfer_done -=
 113                                     runtime->period_size;
 114                                 period_elapsed = 1;
 115                         }
 116
 117                         spin_unlock_irqrestore(&dev->adev->slock, flags);
 118
 119                         if (oldptr + length >= runtime->buffer_size) {
 120                                 unsigned int cnt =
 121                                     runtime->buffer_size - oldptr - 1;
 122                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 123                                        cnt * stride);
 124                                 memcpy(runtime->dma_area, cp + cnt,
 125                                        length * stride - cnt * stride);
 126                         } else {
 127                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 128                                        length * stride);
 129                         }
 130                 }
 131                 if (period_elapsed)
 132                         snd_pcm_period_elapsed(substream);
 133         }
 134         urb->status = 0;
 135
 136         if (dev->adev->shutdown)
 137                 return;
 138
 139         status = usb_submit_urb(urb, GFP_ATOMIC);
 140         if (status < 0) {
 141                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 142                               status);
 143         }
 144         return;
 145 }
 146
 147 static int em28xx_init_audio_isoc(struct em28xx *dev)
 148 {
 149         int       i, errCode;
 150         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
 151                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 152
 153         dprintk("Starting isoc transfers\n");
 154
 155         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 156                 struct urb *urb;
 157                 int j, k;
 158
 159                 dev->adev->transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 160                 if (!dev->adev->transfer_buffer[i])
 161                         return -ENOMEM;
 162
 163                 memset(dev->adev->transfer_buffer[i], 0x80, sb_size);
 164                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 165                 if (!urb)
 166                         return -ENOMEM;
 167
 168                 urb->dev = dev->udev;
 169                 urb->context = dev;
 170                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
 171                 urb->transfer_flags = URB_ISO_ASAP;
 172                 urb->transfer_buffer = dev->adev->transfer_buffer[i];
 173                 urb->interval = 1;
 174                 urb->complete = em28xx_audio_isocirq;
 175                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 176                 urb->transfer_buffer_length = sb_size;
 177
 178                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
 179                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 180                         urb->iso_frame_desc[j].offset = k;
 181                         urb->iso_frame_desc[j].length =
 182                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 183                 }
 184                 dev->adev->urb[i] = urb;
 185         }
 186
 187         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 188                 errCode = usb_submit_urb(dev->adev->urb[i], GFP_ATOMIC);
 189                 if (errCode) {
 190                         em28xx_isoc_audio_deinit(dev);
 191
 192                         return errCode;
 193                 }
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
 200 {
 201         dprintk("%s transfer\n", (dev->adev->capture_stream == STREAM_ON)?
 202                                  "stop" : "start");
 203
 204         switch (cmd) {
 205         case EM28XX_CAPTURE_STREAM_EN:
 206                 if (dev->adev->capture_stream == STREAM_OFF && arg == 1) {
 207                         dev->adev->capture_stream = STREAM_ON;
 208                         em28xx_init_audio_isoc(dev);
 209                 } else if (dev->adev->capture_stream == STREAM_ON && arg == 0) {
 210                         dev->adev->capture_stream = STREAM_OFF;
 211                         em28xx_isoc_audio_deinit(dev);
 212                 } else {
 213                         printk(KERN_ERR "An underrun very likely occurred. "
 214                                         "Ignoring it.\n");
 215                 }
 216                 return 0;
 217         default:
 218                 return -EINVAL;
 219         }
 220 }
 221
 222 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 223                                         size_t size)
 224 {
 225         struct snd_pcm_runtime *runtime = subs->runtime;
 226
 227         dprintk("Alocating vbuffer\n");
 228         if (runtime->dma_area) {
 229                 if (runtime->dma_bytes > size)
 230                         return 0;
 231
 232                 vfree(runtime->dma_area);
 233         }
 234         runtime->dma_area = vmalloc(size);
 235         if (!runtime->dma_area)
 236                 return -ENOMEM;
 237
 238         runtime->dma_bytes = size;
 239
 240         return 0;
 241 }
 242
 243 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 244         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 245                 SNDRV_PCM_INFO_MMAP           |
 246                 SNDRV_PCM_INFO_INTERLEAVED    |
 247                 SNDRV_PCM_INFO_MMAP_VALID,
 248
 249         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 250
 251         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 252
 253         .rate_min = 48000,
 254         .rate_max = 48000,
 255         .channels_min = 2,
 256         .channels_max = 2,
 257         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 258         .period_bytes_min = 64,         /* 12544/2, */
 259         .period_bytes_max = 12544,
 260         .periods_min = 2,
 261         .periods_max = 98,              /* 12544, */
 262 };
 263
 264 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 265 {
 266         struct em28xx *dev = snd_pcm_substream_chip(substream);
 267         struct snd_pcm_runtime *runtime = substream->runtime;
 268         int ret = 0;
 269
 270         dprintk("opening device and trying to acquire exclusive lock\n");
 271
 272         /* Sets volume, mute, etc */
 273         dev->mute = 0;
 274         ret = em28xx_audio_analog_set(dev);
 275         if (ret < 0)
 276                 goto err;
 277
 278         runtime->hw = snd_em28xx_hw_capture;
 279         if (dev->alt == 0 && dev->adev->users == 0) {
 280                 int errCode;
 281                 dev->alt = 7;
 282                 errCode = usb_set_interface(dev->udev, 0, 7);
 283                 dprintk("changing alternate number to 7\n");
 284         }
 285
 286         dev->adev->users++;
 287
 288         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 289         dev->adev->capture_pcm_substream = substream;
 290         runtime->private_data = dev;
 291
 292         return 0;
 293 err:
 294         printk(KERN_ERR "Error while configuring em28xx mixer\n");
 295         return ret;
 296 }
 297
 298 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 299 {
 300         struct em28xx *dev = snd_pcm_substream_chip(substream);
 301         dev->adev->users--;
 302
 303         dprintk("closing device\n");
 304
 305         dev->mute = 1;
 306         em28xx_audio_analog_set(dev);
 307
 308         if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
 309                 dprintk("audio users: %d\n", dev->adev->users);
 310                 dprintk("disabling audio stream!\n");
 311                 dev->adev->shutdown = 0;
 312                 dprintk("released lock\n");
 313                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 314         }
 315         return 0;
 316 }
 317
 318 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 319                                         struct snd_pcm_hw_params *hw_params)
 320 {
 321         unsigned int channels, rate, format;
 322         int ret;
 323
 324         dprintk("Setting capture parameters\n");
 325
 326         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 327                                 params_buffer_bytes(hw_params));
 328         format = params_format(hw_params);
 329         rate = params_rate(hw_params);
 330         channels = params_channels(hw_params);
 331
 332         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 333            current default is 48000hz multiplexed => 96000hz mono
 334            which shouldn't matter since analogue TV only supports mono */
 335         return 0;
 336 }
 337
 338 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 339 {
 340         struct em28xx *dev = snd_pcm_substream_chip(substream);
 341
 342         dprintk("Stop capture, if needed\n");
 343
 344         if (dev->adev->capture_stream == STREAM_ON)
 345                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 346
 347         return 0;
 348 }
 349
 350 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 351 {
 352         return 0;
 353 }
 354
 355 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 356                                       int cmd)
 357 {
 358         struct em28xx *dev = snd_pcm_substream_chip(substream);
 359
 360         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
 361                                        "start": "stop");
 362         switch (cmd) {
 363         case SNDRV_PCM_TRIGGER_START:
 364                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
 365                 return 0;
 366         case SNDRV_PCM_TRIGGER_STOP:
 367                 dev->adev->shutdown = 1;
 368                 return 0;
 369         default:
 370                 return -EINVAL;
 371         }
 372 }
 373
 374 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 375                                                     *substream)
 376 {
 377         struct em28xx *dev;
 378
 379         snd_pcm_uframes_t hwptr_done;
 380         dev = snd_pcm_substream_chip(substream);
 381         hwptr_done = dev->adev->hwptr_done_capture;
 382
 383         return hwptr_done;
 384 }
 385
 386 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 387                                              unsigned long offset)
 388 {
 389         void *pageptr = subs->runtime->dma_area + offset;
 390
 391         return vmalloc_to_page(pageptr);
 392 }
 393
 394 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 395         .open      = snd_em28xx_capture_open,
 396         .close     = snd_em28xx_pcm_close,
 397         .ioctl     = snd_pcm_lib_ioctl,
 398         .hw_params = snd_em28xx_hw_capture_params,
 399         .hw_free   = snd_em28xx_hw_capture_free,
 400         .prepare   = snd_em28xx_prepare,
 401         .trigger   = snd_em28xx_capture_trigger,
 402         .pointer   = snd_em28xx_capture_pointer,
 403         .page      = snd_pcm_get_vmalloc_page,
 404 };
 405
 406 static int em28xx_audio_init(struct em28xx *dev)
 407 {
 408         struct em28xx_audio *adev;
 409         struct snd_pcm      *pcm;
 410         struct snd_card     *card;
 411         static int          devnr;
 412         int                 ret, err;
 413
 414         printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
 415                          "non standard usbaudio\n");
 416         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 417                          "Rechberger\n");
 418
 419         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
 420         if (!adev) {
 421                 printk(KERN_ERR "em28xx-audio.c: out of memory\n");
 422                 return -1;
 423         }
 424         card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
 425         if (card == NULL) {
 426                 kfree(adev);
 427                 return -ENOMEM;
 428         }
 429
 430         spin_lock_init(&adev->slock);
 431         ret = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 432         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 433         pcm->info_flags = 0;
 434         pcm->private_data = dev;
 435         strcpy(pcm->name, "Empia 28xx Capture");
 436         strcpy(card->driver, "Empia Em28xx Audio");
 437         strcpy(card->shortname, "Em28xx Audio");
 438         strcpy(card->longname, "Empia Em28xx Audio");
 439
 440         err = snd_card_register(card);
 441         if (err < 0) {
 442                 snd_card_free(card);
 443                 return -ENOMEM;
 444         }
 445         adev->sndcard = card;
 446         adev->udev = dev->udev;
 447         dev->adev = adev;
 448
 449         return 0;
 450 }
 451
 452 static int em28xx_audio_fini(struct em28xx *dev)
 453 {
 454         if (dev == NULL)
 455                 return 0;
 456
 457         if (dev->adev) {
 458                 snd_card_free(dev->adev->sndcard);
 459                 kfree(dev->adev);
 460                 dev->adev = NULL;
 461         }
 462
 463         return 0;
 464 }
 465
 466 static struct em28xx_ops audio_ops = {
 467         .id   = EM28XX_AUDIO,
 468         .name = "Em28xx Audio Extension",
 469         .init = em28xx_audio_init,
 470         .fini = em28xx_audio_fini,
 471 };
 472
 473 static int __init em28xx_alsa_register(void)
 474 {
 475         request_module("em28xx");
 476         return em28xx_register_extension(&audio_ops);
 477 }
 478
 479 static void __exit em28xx_alsa_unregister(void)
 480 {
 481         em28xx_unregister_extension(&audio_ops);
 482 }
 483
 484 MODULE_LICENSE("GPL");
 485 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 486 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 487 MODULE_DESCRIPTION("Em28xx Audio driver");
 488
 489 module_init(em28xx_alsa_register);
 490 module_exit(em28xx_alsa_unregister);