drivers/media/video/cx231xx/cx231xx-audio.c

   1 /*
   2  *  Conexant Cx231xx audio extension
   3  *
   4  *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
   5  *       Based on em28xx driver
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/usb.h>
  25 #include <linux/init.h>
  26 #include <linux/sound.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/soundcard.h>
  29 #include <linux/slab.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/module.h>
  33 #include <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/info.h>
  37 #include <sound/initval.h>
  38 #include <sound/control.h>
  39 #include <media/v4l2-common.h>
  40 #include "cx231xx.h"
  41 #include "cx231xx-pcb-config.h"
  42
  43 static int debug;
  44 module_param(debug, int, 0644);
  45 MODULE_PARM_DESC(debug, "activates debug info");
  46
  47 #define dprintk(fmt, arg...) do {                                       \
  48             if (debug)                                                  \
  49                 printk(KERN_INFO "cx231xx-audio %s: " fmt,              \
  50                                   __func__, ##arg);             \
  51         } while (0)
  52
  53 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  54
  55 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
  56 {
  57         int i;
  58
  59         dprintk("Stopping isoc\n");
  60
  61
  62         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  63         if(dev->adev.urb[i]) {
  64             if (!irqs_disabled())
  65                             usb_kill_urb(dev->adev.urb[i]);
  66                     else
  67                         usb_unlink_urb(dev->adev.urb[i]);
  68
  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         }
  77
  78         return 0;
  79 }
  80
  81 static void cx231xx_audio_isocirq(struct urb *urb)
  82 {
  83         struct cx231xx            *dev = urb->context;
  84         int                      i;
  85         unsigned int             oldptr;
  86         int                      period_elapsed = 0;
  87         int                      status;
  88         unsigned char            *cp;
  89         unsigned int             stride;
  90         struct snd_pcm_substream *substream;
  91         struct snd_pcm_runtime   *runtime;
  92
  93     switch (urb->status) {
  94             case 0:             /* success */
  95             case -ETIMEDOUT:    /* NAK */
  96                     break;
  97             case -ECONNRESET:   /* kill */
  98             case -ENOENT:
  99             case -ESHUTDOWN:
 100                     return;
 101             default:            /* error */
 102                     dprintk("urb completition error %d.\n", urb->status);
 103                     break;
 104         }
 105
 106         if (dev->adev.capture_pcm_substream) {
 107                 substream = dev->adev.capture_pcm_substream;
 108                 runtime = substream->runtime;
 109                 stride = runtime->frame_bits >> 3;
 110
 111                 for (i = 0; i < urb->number_of_packets; i++) {
 112                         int length =
 113                             urb->iso_frame_desc[i].actual_length / stride;
 114                         cp = (unsigned char *)urb->transfer_buffer +
 115                             urb->iso_frame_desc[i].offset;
 116
 117                         if (!length)
 118                                 continue;
 119
 120                         oldptr = dev->adev.hwptr_done_capture;
 121                         if (oldptr + length >= runtime->buffer_size) {
 122                                 unsigned int cnt =
 123                                     runtime->buffer_size - oldptr;
 124                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 125                                        cnt * stride);
 126                                 memcpy(runtime->dma_area, cp + cnt * stride,
 127                                        length * stride - cnt * stride);
 128                         } else {
 129                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 130                                        length * stride);
 131                         }
 132
 133                         snd_pcm_stream_lock(substream);
 134
 135                         dev->adev.hwptr_done_capture += length;
 136                         if (dev->adev.hwptr_done_capture >=
 137                             runtime->buffer_size)
 138                                 dev->adev.hwptr_done_capture -=
 139                                     runtime->buffer_size;
 140
 141                         dev->adev.capture_transfer_done += length;
 142                         if (dev->adev.capture_transfer_done >=
 143                             runtime->period_size) {
 144                                 dev->adev.capture_transfer_done -=
 145                                     runtime->period_size;
 146                                 period_elapsed = 1;
 147                         }
 148
 149                         snd_pcm_stream_unlock(substream);
 150                 }
 151                 if (period_elapsed)
 152                         snd_pcm_period_elapsed(substream);
 153         }
 154         urb->status = 0;
 155
 156         status = usb_submit_urb(urb, GFP_ATOMIC);
 157         if (status < 0) {
 158                 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
 159                               status);
 160         }
 161         return;
 162 }
 163
 164 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 165 {
 166         int       i, errCode;
 167         int       sb_size;
 168
 169     cx231xx_info("%s: Starting AUDIO transfers\n",__func__);
 170
 171     sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 172
 173         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 174                 struct urb *urb;
 175                 int j, k;
 176
 177                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 178                 if (!dev->adev.transfer_buffer[i])
 179                         return -ENOMEM;
 180
 181                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 182                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 183                 if (!urb) {
 184                         cx231xx_errdev("usb_alloc_urb failed!\n");
 185                         for (j = 0; j < i; j++) {
 186                                 usb_free_urb(dev->adev.urb[j]);
 187                                 kfree(dev->adev.transfer_buffer[j]);
 188                         }
 189                         return -ENOMEM;
 190                 }
 191
 192                 urb->dev = dev->udev;
 193                 urb->context = dev;
 194                 urb->pipe = usb_rcvisocpipe(dev->udev, dev->adev.end_point_addr);
 195                 urb->transfer_flags = URB_ISO_ASAP;
 196                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 197                 urb->interval = 1;
 198                 urb->complete = cx231xx_audio_isocirq;
 199                 urb->number_of_packets = CX231XX_NUM_AUDIO_PACKETS;
 200                 urb->transfer_buffer_length = sb_size;
 201
 202                 for (j = k = 0; j < CX231XX_NUM_AUDIO_PACKETS;
 203                              j++, k += dev->adev.max_pkt_size) {
 204                         urb->iso_frame_desc[j].offset = k;
 205                         urb->iso_frame_desc[j].length =
 206                             dev->adev.max_pkt_size;
 207                 }
 208                 dev->adev.urb[i] = urb;
 209         }
 210
 211         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 212                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 213                 if (errCode < 0) {
 214                         cx231xx_isoc_audio_deinit(dev);
 215                         return errCode;
 216                 }
 217         }
 218
 219         return errCode;
 220 }
 221
 222 static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
 223 {
 224         dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON)?
 225                                  "stop" : "start");
 226
 227         switch (cmd) {
 228     case CX231XX_CAPTURE_STREAM_EN:
 229                 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
 230                         dev->adev.capture_stream = STREAM_ON;
 231                         cx231xx_init_audio_isoc(dev);
 232                 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
 233                         dev->adev.capture_stream = STREAM_OFF;
 234                         cx231xx_isoc_audio_deinit(dev);
 235                 } else {
 236                         cx231xx_errdev( "An underrun very likely occurred. "
 237                                         "Ignoring it.\n");
 238                 }
 239                 return 0;
 240         default:
 241                 return -EINVAL;
 242         }
 243 }
 244
 245 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 246                                         size_t size)
 247 {
 248         struct snd_pcm_runtime *runtime = subs->runtime;
 249
 250         dprintk("Allocating vbuffer\n");
 251         if (runtime->dma_area) {
 252                 if (runtime->dma_bytes > size)
 253                         return 0;
 254
 255                 vfree(runtime->dma_area);
 256         }
 257         runtime->dma_area = vmalloc(size);
 258         if (!runtime->dma_area)
 259                 return -ENOMEM;
 260
 261         runtime->dma_bytes = size;
 262
 263         return 0;
 264 }
 265
 266 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
 267         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 268                 SNDRV_PCM_INFO_MMAP           |
 269                 SNDRV_PCM_INFO_INTERLEAVED    |
 270                 SNDRV_PCM_INFO_MMAP_VALID,
 271
 272         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 273
 274         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 275
 276         .rate_min = 48000,
 277         .rate_max = 48000,
 278         .channels_min = 2,
 279         .channels_max = 2,
 280         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 281         .period_bytes_min = 64,             /* 12544/2, */
 282         .period_bytes_max = 12544,
 283         .periods_min = 2,
 284         .periods_max = 98,                      /* 12544, */
 285 };
 286
 287 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
 288 {
 289         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 290         struct snd_pcm_runtime *runtime = substream->runtime;
 291         int ret = 0;
 292
 293         dprintk("opening device and trying to acquire exclusive lock\n");
 294
 295         if (!dev) {
 296                 cx231xx_errdev("BUG: cx231xx can't find device struct."
 297                                 " Can't proceed with open\n");
 298                 return -ENODEV;
 299         }
 300
 301         /* Sets volume, mute, etc */
 302         dev->mute = 0;
 303
 304     /* set alternate setting for audio interface */
 305     ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1); /* 1 - 48000 samples per sec */
 306     if (ret < 0) {
 307         cx231xx_errdev("failed to set alternate setting !\n");
 308
 309         return ret;
 310     }
 311
 312     /* inform hardware to start streaming */
 313     ret = cx231xx_capture_start(dev, 1, Audio);
 314
 315         runtime->hw = snd_cx231xx_hw_capture;
 316
 317     mutex_lock(&dev->lock);
 318         dev->adev.users++;
 319     mutex_unlock(&dev->lock);
 320
 321         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 322         dev->adev.capture_pcm_substream = substream;
 323         runtime->private_data = dev;
 324
 325         return 0;
 326 }
 327
 328 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 329 {
 330     int ret;
 331         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 332
 333
 334         dprintk("closing device\n");
 335
 336     /* set alternate setting for audio interface */
 337     ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0); /* 1 - 48000 samples per sec */
 338     if (ret < 0) {
 339         cx231xx_errdev("failed to set alternate setting !\n");
 340
 341         return ret;
 342     }
 343
 344     /* inform hardware to start streaming */
 345     ret = cx231xx_capture_start(dev, 0, Audio);
 346
 347         dev->mute = 1;
 348         mutex_lock(&dev->lock);
 349     dev->adev.users--;
 350         mutex_unlock(&dev->lock);
 351
 352         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 353                 dprintk("audio users: %d\n", dev->adev.users);
 354                 dprintk("disabling audio stream!\n");
 355                 dev->adev.shutdown = 0;
 356                 dprintk("released lock\n");
 357                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
 358         }
 359         return 0;
 360 }
 361
 362 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
 363                                         struct snd_pcm_hw_params *hw_params)
 364 {
 365         unsigned int channels, rate, format;
 366         int ret;
 367
 368         dprintk("Setting capture parameters\n");
 369
 370         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 371                                 params_buffer_bytes(hw_params));
 372         format = params_format(hw_params);
 373         rate = params_rate(hw_params);
 374         channels = params_channels(hw_params);
 375
 376         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
 377            current default is 48000hz multiplexed => 96000hz mono
 378            which shouldn't matter since analogue TV only supports mono */
 379         return 0;
 380 }
 381
 382 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
 383 {
 384         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 385
 386         dprintk("Stop capture, if needed\n");
 387
 388         if (dev->adev.capture_stream == STREAM_ON)
 389                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
 390
 391         return 0;
 392 }
 393
 394 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 395 {
 396         return 0;
 397 }
 398
 399 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 400                                       int cmd)
 401 {
 402         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 403     int retval;
 404
 405
 406         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
 407                                        "start": "stop");
 408
 409     spin_lock(&dev->adev.slock);
 410         switch (cmd) {
 411         case SNDRV_PCM_TRIGGER_START:
 412                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_START_AUDIO);
 413                 retval = 0;
 414                 break;
 415         case SNDRV_PCM_TRIGGER_STOP:
 416         cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
 417                 retval = 0;
 418         break;
 419         default:
 420                 retval = -EINVAL;
 421         }
 422
 423     spin_unlock(&dev->adev.slock);
 424         return retval;
 425 }
 426
 427 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
 428                                                     *substream)
 429 {
 430         struct cx231xx *dev;
 431     unsigned long flags;
 432         snd_pcm_uframes_t hwptr_done;
 433
 434         dev = snd_pcm_substream_chip(substream);
 435
 436     spin_lock_irqsave(&dev->adev.slock, flags);
 437         hwptr_done = dev->adev.hwptr_done_capture;
 438     spin_unlock_irqrestore(&dev->adev.slock, flags);
 439
 440         return hwptr_done;
 441 }
 442
 443 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 444                                              unsigned long offset)
 445 {
 446         void *pageptr = subs->runtime->dma_area + offset;
 447
 448         return vmalloc_to_page(pageptr);
 449 }
 450
 451 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
 452         .open      = snd_cx231xx_capture_open,
 453         .close     = snd_cx231xx_pcm_close,
 454         .ioctl     = snd_pcm_lib_ioctl,
 455         .hw_params = snd_cx231xx_hw_capture_params,
 456         .hw_free   = snd_cx231xx_hw_capture_free,
 457         .prepare   = snd_cx231xx_prepare,
 458         .trigger   = snd_cx231xx_capture_trigger,
 459         .pointer   = snd_cx231xx_capture_pointer,
 460         .page      = snd_pcm_get_vmalloc_page,
 461 };
 462
 463 static int cx231xx_audio_init(struct cx231xx *dev)
 464 {
 465         struct cx231xx_audio *adev = &dev->adev;
 466         struct snd_pcm      *pcm;
 467         struct snd_card     *card;
 468         static int          devnr;
 469         int                 err;
 470     struct usb_interface *uif;
 471     int i, isoc_pipe = 0;
 472
 473         if (dev->has_alsa_audio != 1) {
 474                 /* This device does not support the extension (in this case
 475                    the device is expecting the snd-usb-audio module or
 476                    doesn't have analog audio support at all) */
 477                 return 0;
 478         }
 479
 480         cx231xx_info("cx231xx-audio.c: probing for cx231xx "
 481                          "non standard usbaudio\n");
 482
 483         card = snd_card_new(index[devnr], "Cx231xx Audio", THIS_MODULE, 0);
 484         if (card == NULL) {
 485                 return -ENOMEM;
 486         }
 487
 488         spin_lock_init(&adev->slock);
 489         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
 490         if (err < 0) {
 491                 snd_card_free(card);
 492                 return err;
 493         }
 494
 495         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx231xx_pcm_capture);
 496         pcm->info_flags = 0;
 497         pcm->private_data = dev;
 498         strcpy(pcm->name, "Conexant cx231xx Capture");
 499         strcpy(card->driver, "Conexant cx231xx Audio");
 500         strcpy(card->shortname, "Cx231xx Audio");
 501         strcpy(card->longname, "Conexant cx231xx Audio");
 502
 503         err = snd_card_register(card);
 504         if (err < 0) {
 505                 snd_card_free(card);
 506                 return err;
 507         }
 508         adev->sndcard = card;
 509         adev->udev = dev->udev;
 510
 511     /* compute alternate max packet sizes for Audio */
 512     uif = dev->udev->actconfig->interface[dev->current_pcb_config.hs_config_info[0].interface_info.audio_index+1];
 513
 514     adev->end_point_addr = le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.bEndpointAddress);
 515
 516     adev->num_alt = uif->num_altsetting;
 517     cx231xx_info(": EndPoint Addr 0x%x, Alternate settings: %i\n", adev->end_point_addr,
 518                                     adev->num_alt);
 519     adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
 520
 521     if (adev->alt_max_pkt_size == NULL) {
 522         cx231xx_errdev("out of memory!\n");
 523         return -ENOMEM;
 524     }
 525
 526     for (i = 0; i < adev->num_alt ; i++) {
 527         u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
 528                                                 wMaxPacketSize);
 529         adev->alt_max_pkt_size[i] =
 530             (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
 531         cx231xx_info("Alternate setting %i, max size= %i\n", i,
 532                                         adev->alt_max_pkt_size[i]);
 533     }
 534
 535         return 0;
 536 }
 537
 538 static int cx231xx_audio_fini(struct cx231xx *dev)
 539 {
 540         if (dev == NULL)
 541                 return 0;
 542
 543         if (dev->has_alsa_audio != 1) {
 544                 /* This device does not support the extension (in this case
 545                    the device is expecting the snd-usb-audio module or
 546                    doesn't have analog audio support at all) */
 547                 return 0;
 548         }
 549
 550         if (dev->adev.sndcard) {
 551                 snd_card_free(dev->adev.sndcard);
 552         kfree(dev->adev.alt_max_pkt_size);
 553                 dev->adev.sndcard = NULL;
 554         }
 555
 556         return 0;
 557 }
 558
 559 static struct cx231xx_ops audio_ops = {
 560     .id   = CX231XX_AUDIO,
 561         .name = "Cx231xx Audio Extension",
 562         .init = cx231xx_audio_init,
 563         .fini = cx231xx_audio_fini,
 564 };
 565
 566 static int __init cx231xx_alsa_register(void)
 567 {
 568         return cx231xx_register_extension(&audio_ops);
 569 }
 570
 571 static void __exit cx231xx_alsa_unregister(void)
 572 {
 573         cx231xx_unregister_extension(&audio_ops);
 574 }
 575
 576 MODULE_LICENSE("GPL");
 577 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 578 MODULE_DESCRIPTION("Cx231xx Audio driver");
 579
 580 module_init(cx231xx_alsa_register);
 581 module_exit(cx231xx_alsa_unregister);