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                kfree(dev->adev.transfer_buffer[i]);
  70                dev->adev.transfer_buffer[i] = NULL;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static void em28xx_audio_isocirq(struct urb *urb)
  77 {
  78         struct em28xx            *dev = urb->context;
  79         int                      i;
  80         unsigned int             oldptr;
  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                         oldptr = dev->adev.hwptr_done_capture;
 102                         if (oldptr + length >= runtime->buffer_size) {
 103                                 unsigned int cnt =
 104                                     runtime->buffer_size - oldptr;
 105                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 106                                        cnt * stride);
 107                                 memcpy(runtime->dma_area, cp + cnt * stride,
 108                                        length * stride - cnt * stride);
 109                         } else {
 110                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 111                                        length * stride);
 112                         }
 113
 114                         snd_pcm_stream_lock(substream);
 115
 116                         dev->adev.hwptr_done_capture += length;
 117                         if (dev->adev.hwptr_done_capture >=
 118                             runtime->buffer_size)
 119                                 dev->adev.hwptr_done_capture -=
 120                                     runtime->buffer_size;
 121
 122                         dev->adev.capture_transfer_done += length;
 123                         if (dev->adev.capture_transfer_done >=
 124                             runtime->period_size) {
 125                                 dev->adev.capture_transfer_done -=
 126                                     runtime->period_size;
 127                                 period_elapsed = 1;
 128                         }
 129
 130                         snd_pcm_stream_unlock(substream);
 131                 }
 132                 if (period_elapsed)
 133                         snd_pcm_period_elapsed(substream);
 134         }
 135         urb->status = 0;
 136
 137         if (dev->adev.shutdown)
 138                 return;
 139
 140         status = usb_submit_urb(urb, GFP_ATOMIC);
 141         if (status < 0) {
 142                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 143                               status);
 144         }
 145         return;
 146 }
 147
 148 static int em28xx_init_audio_isoc(struct em28xx *dev)
 149 {
 150         int       i, errCode;
 151         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
 152                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 153
 154         dprintk("Starting isoc transfers\n");
 155
 156         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 157                 struct urb *urb;
 158                 int j, k;
 159
 160                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 161                 if (!dev->adev.transfer_buffer[i])
 162                         return -ENOMEM;
 163
 164                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 165                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 166                 if (!urb) {
 167                         em28xx_errdev("usb_alloc_urb failed!\n");
 168                         for (j = 0; j < i; j++) {
 169                                 usb_free_urb(dev->adev.urb[j]);
 170                                 kfree(dev->adev.transfer_buffer[j]);
 171                         }
 172                         return -ENOMEM;
 173                 }
 174
 175                 urb->dev = dev->udev;
 176                 urb->context = dev;
 177                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
 178                 urb->transfer_flags = URB_ISO_ASAP;
 179                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 180                 urb->interval = 1;
 181                 urb->complete = em28xx_audio_isocirq;
 182                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 183                 urb->transfer_buffer_length = sb_size;
 184
 185                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
 186                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 187                         urb->iso_frame_desc[j].offset = k;
 188                         urb->iso_frame_desc[j].length =
 189                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 190                 }
 191                 dev->adev.urb[i] = urb;
 192         }
 193
 194         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 195                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 196                 if (errCode) {
 197                         em28xx_isoc_audio_deinit(dev);
 198
 199                         return errCode;
 200                 }
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int em28xx_cmd(struct em28xx *dev, int cmd, int arg)
 207 {
 208         dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
 209                                  "stop" : "start");
 210
 211         switch (cmd) {
 212         case EM28XX_CAPTURE_STREAM_EN:
 213                 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
 214                         dev->adev.capture_stream = STREAM_ON;
 215                         em28xx_init_audio_isoc(dev);
 216                 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
 217                         dev->adev.capture_stream = STREAM_OFF;
 218                         em28xx_isoc_audio_deinit(dev);
 219                 } else {
 220                         printk(KERN_ERR "An underrun very likely occurred. "
 221                                         "Ignoring it.\n");
 222                 }
 223                 return 0;
 224         default:
 225                 return -EINVAL;
 226         }
 227 }
 228
 229 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 230                                         size_t size)
 231 {
 232         struct snd_pcm_runtime *runtime = subs->runtime;
 233
 234         dprintk("Alocating vbuffer\n");
 235         if (runtime->dma_area) {
 236                 if (runtime->dma_bytes > size)
 237                         return 0;
 238
 239                 vfree(runtime->dma_area);
 240         }
 241         runtime->dma_area = vmalloc(size);
 242         if (!runtime->dma_area)
 243                 return -ENOMEM;
 244
 245         runtime->dma_bytes = size;
 246
 247         return 0;
 248 }
 249
 250 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 251         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 252                 SNDRV_PCM_INFO_MMAP           |
 253                 SNDRV_PCM_INFO_INTERLEAVED    |
 254                 SNDRV_PCM_INFO_MMAP_VALID,
 255
 256         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 257
 258         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 259
 260         .rate_min = 48000,
 261         .rate_max = 48000,
 262         .channels_min = 2,
 263         .channels_max = 2,
 264         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 265         .period_bytes_min = 64,         /* 12544/2, */
 266         .period_bytes_max = 12544,
 267         .periods_min = 2,
 268         .periods_max = 98,              /* 12544, */
 269 };
 270
 271 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 272 {
 273         struct em28xx *dev = snd_pcm_substream_chip(substream);
 274         struct snd_pcm_runtime *runtime = substream->runtime;
 275         int ret = 0;
 276
 277         dprintk("opening device and trying to acquire exclusive lock\n");
 278
 279         if (!dev) {
 280                 printk(KERN_ERR "BUG: em28xx can't find device struct."
 281                                 " Can't proceed with open\n");
 282                 return -ENODEV;
 283         }
 284
 285         /* Sets volume, mute, etc */
 286
 287         dev->mute = 0;
 288         mutex_lock(&dev->lock);
 289         ret = em28xx_audio_analog_set(dev);
 290         mutex_unlock(&dev->lock);
 291         if (ret < 0)
 292                 goto err;
 293
 294         runtime->hw = snd_em28xx_hw_capture;
 295         if (dev->alt == 0 && dev->adev.users == 0) {
 296                 int errCode;
 297                 dev->alt = 7;
 298                 errCode = usb_set_interface(dev->udev, 0, 7);
 299                 dprintk("changing alternate number to 7\n");
 300         }
 301
 302         dev->adev.users++;
 303
 304         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 305         dev->adev.capture_pcm_substream = substream;
 306         runtime->private_data = dev;
 307
 308         return 0;
 309 err:
 310         printk(KERN_ERR "Error while configuring em28xx mixer\n");
 311         return ret;
 312 }
 313
 314 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 315 {
 316         struct em28xx *dev = snd_pcm_substream_chip(substream);
 317         dev->adev.users--;
 318
 319         dprintk("closing device\n");
 320
 321         dev->mute = 1;
 322         mutex_lock(&dev->lock);
 323         em28xx_audio_analog_set(dev);
 324         mutex_unlock(&dev->lock);
 325
 326         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 327                 dprintk("audio users: %d\n", dev->adev.users);
 328                 dprintk("disabling audio stream!\n");
 329                 dev->adev.shutdown = 0;
 330                 dprintk("released lock\n");
 331                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 332         }
 333         return 0;
 334 }
 335
 336 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 337                                         struct snd_pcm_hw_params *hw_params)
 338 {
 339         unsigned int channels, rate, format;
 340         int ret;
 341
 342         dprintk("Setting capture parameters\n");
 343
 344         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 345                                 params_buffer_bytes(hw_params));
 346         format = params_format(hw_params);
 347         rate = params_rate(hw_params);
 348         channels = params_channels(hw_params);
 349
 350         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 351            current default is 48000hz multiplexed => 96000hz mono
 352            which shouldn't matter since analogue TV only supports mono */
 353         return 0;
 354 }
 355
 356 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 357 {
 358         struct em28xx *dev = snd_pcm_substream_chip(substream);
 359
 360         dprintk("Stop capture, if needed\n");
 361
 362         if (dev->adev.capture_stream == STREAM_ON)
 363                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 364
 365         return 0;
 366 }
 367
 368 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 369 {
 370         return 0;
 371 }
 372
 373 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 374                                       int cmd)
 375 {
 376         struct em28xx *dev = snd_pcm_substream_chip(substream);
 377
 378         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
 379                                        "start": "stop");
 380         switch (cmd) {
 381         case SNDRV_PCM_TRIGGER_START:
 382                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
 383                 return 0;
 384         case SNDRV_PCM_TRIGGER_STOP:
 385                 dev->adev.shutdown = 1;
 386                 return 0;
 387         default:
 388                 return -EINVAL;
 389         }
 390 }
 391
 392 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 393                                                     *substream)
 394 {
 395        unsigned long flags;
 396
 397         struct em28xx *dev;
 398         snd_pcm_uframes_t hwptr_done;
 399
 400         dev = snd_pcm_substream_chip(substream);
 401        spin_lock_irqsave(&dev->adev.slock, flags);
 402         hwptr_done = dev->adev.hwptr_done_capture;
 403        spin_unlock_irqrestore(&dev->adev.slock, flags);
 404
 405         return hwptr_done;
 406 }
 407
 408 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 409                                              unsigned long offset)
 410 {
 411         void *pageptr = subs->runtime->dma_area + offset;
 412
 413         return vmalloc_to_page(pageptr);
 414 }
 415
 416 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 417         .open      = snd_em28xx_capture_open,
 418         .close     = snd_em28xx_pcm_close,
 419         .ioctl     = snd_pcm_lib_ioctl,
 420         .hw_params = snd_em28xx_hw_capture_params,
 421         .hw_free   = snd_em28xx_hw_capture_free,
 422         .prepare   = snd_em28xx_prepare,
 423         .trigger   = snd_em28xx_capture_trigger,
 424         .pointer   = snd_em28xx_capture_pointer,
 425         .page      = snd_pcm_get_vmalloc_page,
 426 };
 427
 428 static int em28xx_audio_init(struct em28xx *dev)
 429 {
 430         struct em28xx_audio *adev = &dev->adev;
 431         struct snd_pcm      *pcm;
 432         struct snd_card     *card;
 433         static int          devnr;
 434         int                 err;
 435
 436         if (dev->has_alsa_audio != 1) {
 437                 /* This device does not support the extension (in this case
 438                    the device is expecting the snd-usb-audio module or
 439                    doesn't have analog audio support at all) */
 440                 return 0;
 441         }
 442
 443         printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
 444                          "non standard usbaudio\n");
 445         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 446                          "Rechberger\n");
 447
 448         card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE, 0);
 449         if (card == NULL)
 450                 return -ENOMEM;
 451
 452         spin_lock_init(&adev->slock);
 453         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 454         if (err < 0) {
 455                 snd_card_free(card);
 456                 return err;
 457         }
 458
 459         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 460         pcm->info_flags = 0;
 461         pcm->private_data = dev;
 462         strcpy(pcm->name, "Empia 28xx Capture");
 463         strcpy(card->driver, "Empia Em28xx Audio");
 464         strcpy(card->shortname, "Em28xx Audio");
 465         strcpy(card->longname, "Empia Em28xx Audio");
 466
 467         err = snd_card_register(card);
 468         if (err < 0) {
 469                 snd_card_free(card);
 470                 return err;
 471         }
 472         adev->sndcard = card;
 473         adev->udev = dev->udev;
 474
 475         return 0;
 476 }
 477
 478 static int em28xx_audio_fini(struct em28xx *dev)
 479 {
 480         if (dev == NULL)
 481                 return 0;
 482
 483         if (dev->has_alsa_audio != 1) {
 484                 /* This device does not support the extension (in this case
 485                    the device is expecting the snd-usb-audio module or
 486                    doesn't have analog audio support at all) */
 487                 return 0;
 488         }
 489
 490         if (dev->adev.sndcard) {
 491                 snd_card_free(dev->adev.sndcard);
 492                 dev->adev.sndcard = NULL;
 493         }
 494
 495         return 0;
 496 }
 497
 498 static struct em28xx_ops audio_ops = {
 499         .id   = EM28XX_AUDIO,
 500         .name = "Em28xx Audio Extension",
 501         .init = em28xx_audio_init,
 502         .fini = em28xx_audio_fini,
 503 };
 504
 505 static int __init em28xx_alsa_register(void)
 506 {
 507         return em28xx_register_extension(&audio_ops);
 508 }
 509
 510 static void __exit em28xx_alsa_unregister(void)
 511 {
 512         em28xx_unregister_extension(&audio_ops);
 513 }
 514
 515 MODULE_LICENSE("GPL");
 516 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 517 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 518 MODULE_DESCRIPTION("Em28xx Audio driver");
 519
 520 module_init(em28xx_alsa_register);
 521 module_exit(em28xx_alsa_unregister);