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_deinit_isoc_audio(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
  70                 usb_free_urb(dev->adev.urb[i]);
  71                 dev->adev.urb[i] = NULL;
  72
  73                 kfree(dev->adev.transfer_buffer[i]);
  74                 dev->adev.transfer_buffer[i] = NULL;
  75         }
  76
  77         return 0;
  78 }
  79
  80 static void em28xx_audio_isocirq(struct urb *urb)
  81 {
  82         struct em28xx            *dev = urb->context;
  83         int                      i;
  84         unsigned int             oldptr;
  85         int                      period_elapsed = 0;
  86         int                      status;
  87         unsigned char            *cp;
  88         unsigned int             stride;
  89         struct snd_pcm_substream *substream;
  90         struct snd_pcm_runtime   *runtime;
  91
  92         switch (urb->status) {
  93         case 0:             /* success */
  94         case -ETIMEDOUT:    /* NAK */
  95                 break;
  96         case -ECONNRESET:   /* kill */
  97         case -ENOENT:
  98         case -ESHUTDOWN:
  99                 return;
 100         default:            /* error */
 101                 dprintk("urb completition error %d.\n", urb->status);
 102                 break;
 103         }
 104
 105         if (atomic_read(&dev->stream_started) == 0)
 106                 return;
 107
 108         if (dev->adev.capture_pcm_substream) {
 109                 substream = dev->adev.capture_pcm_substream;
 110                 runtime = substream->runtime;
 111                 stride = runtime->frame_bits >> 3;
 112
 113                 for (i = 0; i < urb->number_of_packets; i++) {
 114                         int length =
 115                             urb->iso_frame_desc[i].actual_length / stride;
 116                         cp = (unsigned char *)urb->transfer_buffer +
 117                             urb->iso_frame_desc[i].offset;
 118
 119                         if (!length)
 120                                 continue;
 121
 122                         oldptr = dev->adev.hwptr_done_capture;
 123                         if (oldptr + length >= runtime->buffer_size) {
 124                                 unsigned int cnt =
 125                                     runtime->buffer_size - oldptr;
 126                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 127                                        cnt * stride);
 128                                 memcpy(runtime->dma_area, cp + cnt * stride,
 129                                        length * stride - cnt * stride);
 130                         } else {
 131                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 132                                        length * stride);
 133                         }
 134
 135                         snd_pcm_stream_lock(substream);
 136
 137                         dev->adev.hwptr_done_capture += length;
 138                         if (dev->adev.hwptr_done_capture >=
 139                             runtime->buffer_size)
 140                                 dev->adev.hwptr_done_capture -=
 141                                     runtime->buffer_size;
 142
 143                         dev->adev.capture_transfer_done += length;
 144                         if (dev->adev.capture_transfer_done >=
 145                             runtime->period_size) {
 146                                 dev->adev.capture_transfer_done -=
 147                                     runtime->period_size;
 148                                 period_elapsed = 1;
 149                         }
 150
 151                         snd_pcm_stream_unlock(substream);
 152                 }
 153                 if (period_elapsed)
 154                         snd_pcm_period_elapsed(substream);
 155         }
 156         urb->status = 0;
 157
 158         status = usb_submit_urb(urb, GFP_ATOMIC);
 159         if (status < 0) {
 160                 em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
 161                               status);
 162         }
 163         return;
 164 }
 165
 166 static int em28xx_init_audio_isoc(struct em28xx *dev)
 167 {
 168         int       i, errCode;
 169         const int sb_size = EM28XX_NUM_AUDIO_PACKETS *
 170                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 171
 172         dprintk("Starting isoc transfers\n");
 173
 174         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 175                 struct urb *urb;
 176                 int j, k;
 177
 178                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 179                 if (!dev->adev.transfer_buffer[i])
 180                         return -ENOMEM;
 181
 182                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 183                 urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 184                 if (!urb) {
 185                         em28xx_errdev("usb_alloc_urb failed!\n");
 186                         for (j = 0; j < i; j++) {
 187                                 usb_free_urb(dev->adev.urb[j]);
 188                                 kfree(dev->adev.transfer_buffer[j]);
 189                         }
 190                         return -ENOMEM;
 191                 }
 192
 193                 urb->dev = dev->udev;
 194                 urb->context = dev;
 195                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x83);
 196                 urb->transfer_flags = URB_ISO_ASAP;
 197                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 198                 urb->interval = 1;
 199                 urb->complete = em28xx_audio_isocirq;
 200                 urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS;
 201                 urb->transfer_buffer_length = sb_size;
 202
 203                 for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS;
 204                              j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) {
 205                         urb->iso_frame_desc[j].offset = k;
 206                         urb->iso_frame_desc[j].length =
 207                             EM28XX_AUDIO_MAX_PACKET_SIZE;
 208                 }
 209                 dev->adev.urb[i] = urb;
 210         }
 211
 212         for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 213                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 214                 if (errCode) {
 215                         em28xx_deinit_isoc_audio(dev);
 216                         return errCode;
 217                 }
 218         }
 219
 220         return 0;
 221 }
 222
 223 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 224                                         size_t size)
 225 {
 226         struct snd_pcm_runtime *runtime = subs->runtime;
 227
 228         dprintk("Allocating vbuffer\n");
 229         if (runtime->dma_area) {
 230                 if (runtime->dma_bytes > size)
 231                         return 0;
 232
 233                 vfree(runtime->dma_area);
 234         }
 235         runtime->dma_area = vmalloc(size);
 236         if (!runtime->dma_area)
 237                 return -ENOMEM;
 238
 239         runtime->dma_bytes = size;
 240
 241         return 0;
 242 }
 243
 244 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 245         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 246                 SNDRV_PCM_INFO_MMAP           |
 247                 SNDRV_PCM_INFO_INTERLEAVED    |
 248                 SNDRV_PCM_INFO_MMAP_VALID,
 249
 250         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 251
 252         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 253
 254         .rate_min = 48000,
 255         .rate_max = 48000,
 256         .channels_min = 2,
 257         .channels_max = 2,
 258         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 259         .period_bytes_min = 64,         /* 12544/2, */
 260         .period_bytes_max = 12544,
 261         .periods_min = 2,
 262         .periods_max = 98,              /* 12544, */
 263 };
 264
 265 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 266 {
 267         struct em28xx *dev = snd_pcm_substream_chip(substream);
 268         struct snd_pcm_runtime *runtime = substream->runtime;
 269         int ret = 0;
 270
 271         dprintk("opening device and trying to acquire exclusive lock\n");
 272
 273         if (!dev) {
 274                 em28xx_err("BUG: em28xx can't find device struct."
 275                                 " Can't proceed with open\n");
 276                 return -ENODEV;
 277         }
 278
 279         /* Sets volume, mute, etc */
 280
 281         dev->mute = 0;
 282         mutex_lock(&dev->lock);
 283         ret = em28xx_audio_analog_set(dev);
 284         if (ret < 0)
 285                 goto err;
 286
 287         runtime->hw = snd_em28xx_hw_capture;
 288         if (dev->alt == 0 && dev->adev.users == 0) {
 289                 int errCode;
 290                 dev->alt = 7;
 291                 dprintk("changing alternate number to 7\n");
 292                 errCode = usb_set_interface(dev->udev, 0, 7);
 293         }
 294
 295         dev->adev.users++;
 296         mutex_unlock(&dev->lock);
 297
 298         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 299         dev->adev.capture_pcm_substream = substream;
 300         runtime->private_data = dev;
 301
 302         return 0;
 303 err:
 304         mutex_unlock(&dev->lock);
 305
 306         em28xx_err("Error while configuring em28xx mixer\n");
 307         return ret;
 308 }
 309
 310 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 311 {
 312         struct em28xx *dev = snd_pcm_substream_chip(substream);
 313
 314         dprintk("closing device\n");
 315
 316         dev->mute = 1;
 317         mutex_lock(&dev->lock);
 318         dev->adev.users--;
 319         if (atomic_read(&dev->stream_started) > 0) {
 320                 atomic_set(&dev->stream_started, 0);
 321                 schedule_work(&dev->wq_trigger);
 322         }
 323
 324         em28xx_audio_analog_set(dev);
 325         if (substream->runtime->dma_area) {
 326                 dprintk("freeing\n");
 327                 vfree(substream->runtime->dma_area);
 328                 substream->runtime->dma_area = NULL;
 329         }
 330         mutex_unlock(&dev->lock);
 331
 332         return 0;
 333 }
 334
 335 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 336                                         struct snd_pcm_hw_params *hw_params)
 337 {
 338         unsigned int channels, rate, format;
 339         int ret;
 340
 341         dprintk("Setting capture parameters\n");
 342
 343         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 344                                 params_buffer_bytes(hw_params));
 345         format = params_format(hw_params);
 346         rate = params_rate(hw_params);
 347         channels = params_channels(hw_params);
 348
 349         /* TODO: set up em28xx audio chip to deliver the correct audio format,
 350            current default is 48000hz multiplexed => 96000hz mono
 351            which shouldn't matter since analogue TV only supports mono */
 352         return 0;
 353 }
 354
 355 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 356 {
 357         struct em28xx *dev = snd_pcm_substream_chip(substream);
 358
 359         dprintk("Stop capture, if needed\n");
 360
 361         if (atomic_read(&dev->stream_started) > 0) {
 362                 atomic_set(&dev->stream_started, 0);
 363                 schedule_work(&dev->wq_trigger);
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 370 {
 371         struct em28xx *dev = snd_pcm_substream_chip(substream);
 372
 373         dev->adev.hwptr_done_capture = 0;
 374         dev->adev.capture_transfer_done = 0;
 375
 376         return 0;
 377 }
 378
 379 static void audio_trigger(struct work_struct *work)
 380 {
 381         struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
 382
 383         if (atomic_read(&dev->stream_started)) {
 384                 dprintk("starting capture");
 385                 em28xx_init_audio_isoc(dev);
 386         } else {
 387                 dprintk("stopping capture");
 388                 em28xx_deinit_isoc_audio(dev);
 389         }
 390 }
 391
 392 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 393                                       int cmd)
 394 {
 395         struct em28xx *dev = snd_pcm_substream_chip(substream);
 396         int retval;
 397
 398         switch (cmd) {
 399         case SNDRV_PCM_TRIGGER_START:
 400                 atomic_set(&dev->stream_started, 1);
 401                 break;
 402         case SNDRV_PCM_TRIGGER_STOP:
 403                 atomic_set(&dev->stream_started, 1);
 404                 break;
 405         default:
 406                 retval = -EINVAL;
 407         }
 408         schedule_work(&dev->wq_trigger);
 409         return 0;
 410 }
 411
 412 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 413                                                     *substream)
 414 {
 415         unsigned long flags;
 416         struct em28xx *dev;
 417         snd_pcm_uframes_t hwptr_done;
 418
 419         dev = snd_pcm_substream_chip(substream);
 420         spin_lock_irqsave(&dev->adev.slock, flags);
 421         hwptr_done = dev->adev.hwptr_done_capture;
 422         spin_unlock_irqrestore(&dev->adev.slock, flags);
 423
 424         return hwptr_done;
 425 }
 426
 427 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 428                                              unsigned long offset)
 429 {
 430         void *pageptr = subs->runtime->dma_area + offset;
 431
 432         return vmalloc_to_page(pageptr);
 433 }
 434
 435 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
 436         .open      = snd_em28xx_capture_open,
 437         .close     = snd_em28xx_pcm_close,
 438         .ioctl     = snd_pcm_lib_ioctl,
 439         .hw_params = snd_em28xx_hw_capture_params,
 440         .hw_free   = snd_em28xx_hw_capture_free,
 441         .prepare   = snd_em28xx_prepare,
 442         .trigger   = snd_em28xx_capture_trigger,
 443         .pointer   = snd_em28xx_capture_pointer,
 444         .page      = snd_pcm_get_vmalloc_page,
 445 };
 446
 447 static int em28xx_audio_init(struct em28xx *dev)
 448 {
 449         struct em28xx_audio *adev = &dev->adev;
 450         struct snd_pcm      *pcm;
 451         struct snd_card     *card;
 452         static int          devnr;
 453         int                 err;
 454
 455         if (dev->has_alsa_audio != 1) {
 456                 /* This device does not support the extension (in this case
 457                    the device is expecting the snd-usb-audio module or
 458                    doesn't have analog audio support at all) */
 459                 return 0;
 460         }
 461
 462         printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
 463                          "non standard usbaudio\n");
 464         printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
 465                          "Rechberger\n");
 466
 467         err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
 468                               &card);
 469         if (err < 0)
 470                 return err;
 471
 472         spin_lock_init(&adev->slock);
 473         err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 474         if (err < 0) {
 475                 snd_card_free(card);
 476                 return err;
 477         }
 478
 479         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 480         pcm->info_flags = 0;
 481         pcm->private_data = dev;
 482         strcpy(pcm->name, "Empia 28xx Capture");
 483
 484         snd_card_set_dev(card, &dev->udev->dev);
 485         strcpy(card->driver, "Em28xx-Audio");
 486         strcpy(card->shortname, "Em28xx Audio");
 487         strcpy(card->longname, "Empia Em28xx Audio");
 488
 489         INIT_WORK(&dev->wq_trigger, audio_trigger);
 490
 491         err = snd_card_register(card);
 492         if (err < 0) {
 493                 snd_card_free(card);
 494                 return err;
 495         }
 496         adev->sndcard = card;
 497         adev->udev = dev->udev;
 498
 499         return 0;
 500 }
 501
 502 static int em28xx_audio_fini(struct em28xx *dev)
 503 {
 504         if (dev == NULL)
 505                 return 0;
 506
 507         if (dev->has_alsa_audio != 1) {
 508                 /* This device does not support the extension (in this case
 509                    the device is expecting the snd-usb-audio module or
 510                    doesn't have analog audio support at all) */
 511                 return 0;
 512         }
 513
 514         if (dev->adev.sndcard) {
 515                 snd_card_free(dev->adev.sndcard);
 516                 dev->adev.sndcard = NULL;
 517         }
 518
 519         return 0;
 520 }
 521
 522 static struct em28xx_ops audio_ops = {
 523         .id   = EM28XX_AUDIO,
 524         .name = "Em28xx Audio Extension",
 525         .init = em28xx_audio_init,
 526         .fini = em28xx_audio_fini,
 527 };
 528
 529 static int __init em28xx_alsa_register(void)
 530 {
 531         return em28xx_register_extension(&audio_ops);
 532 }
 533
 534 static void __exit em28xx_alsa_unregister(void)
 535 {
 536         em28xx_unregister_extension(&audio_ops);
 537 }
 538
 539 MODULE_LICENSE("GPL");
 540 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
 541 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 542 MODULE_DESCRIPTION("Em28xx Audio driver");
 543
 544 module_init(em28xx_alsa_register);
 545 module_exit(em28xx_alsa_unregister);