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
  42 static int debug;
  43 module_param(debug, int, 0644);
  44 MODULE_PARM_DESC(debug, "activates debug info");
  45
  46 #define dprintk(fmt, arg...) do {                                       \
  47                 if (debug)                                              \
  48                         printk(KERN_INFO "cx231xx-audio %s: " fmt,      \
  49                                 __func__, ##arg);                       \
  50         } while (0)
  51
  52 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  53
  54 static int cx231xx_isoc_audio_deinit(struct cx231xx *dev)
  55 {
  56         int i;
  57
  58         dprintk("Stopping isoc\n");
  59
  60         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
  61                 if (dev->adev.urb[i]) {
  62                         if (!irqs_disabled())
  63                                 usb_kill_urb(dev->adev.urb[i]);
  64                         else
  65                                 usb_unlink_urb(dev->adev.urb[i]);
  66
  67                         usb_free_urb(dev->adev.urb[i]);
  68                         dev->adev.urb[i] = NULL;
  69
  70                         kfree(dev->adev.transfer_buffer[i]);
  71                         dev->adev.transfer_buffer[i] = NULL;
  72                 }
  73         }
  74
  75         return 0;
  76 }
  77
  78 static void cx231xx_audio_isocirq(struct urb *urb)
  79 {
  80         struct cx231xx *dev = urb->context;
  81         int i;
  82         unsigned int oldptr;
  83         int period_elapsed = 0;
  84         int status;
  85         unsigned char *cp;
  86         unsigned int stride;
  87         struct snd_pcm_substream *substream;
  88         struct snd_pcm_runtime *runtime;
  89
  90         switch (urb->status) {
  91         case 0:         /* success */
  92         case -ETIMEDOUT:        /* NAK */
  93                 break;
  94         case -ECONNRESET:       /* kill */
  95         case -ENOENT:
  96         case -ESHUTDOWN:
  97                 return;
  98         default:                /* error */
  99                 dprintk("urb completition error %d.\n", urb->status);
 100                 break;
 101         }
 102
 103         if (dev->adev.capture_pcm_substream) {
 104                 substream = dev->adev.capture_pcm_substream;
 105                 runtime = substream->runtime;
 106                 stride = runtime->frame_bits >> 3;
 107
 108                 for (i = 0; i < urb->number_of_packets; i++) {
 109                         int length = urb->iso_frame_desc[i].actual_length /
 110                                      stride;
 111                         cp = (unsigned char *)urb->transfer_buffer +
 112                                               urb->iso_frame_desc[i].offset;
 113
 114                         if (!length)
 115                                 continue;
 116
 117                         oldptr = dev->adev.hwptr_done_capture;
 118                         if (oldptr + length >= runtime->buffer_size) {
 119                                 unsigned int cnt;
 120
 121                                 cnt = runtime->buffer_size - oldptr;
 122                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 123                                        cnt * stride);
 124                                 memcpy(runtime->dma_area, cp + cnt * stride,
 125                                        length * stride - cnt * stride);
 126                         } else {
 127                                 memcpy(runtime->dma_area + oldptr * stride, cp,
 128                                        length * stride);
 129                         }
 130
 131                         snd_pcm_stream_lock(substream);
 132
 133                         dev->adev.hwptr_done_capture += length;
 134                         if (dev->adev.hwptr_done_capture >=
 135                                                 runtime->buffer_size)
 136                                 dev->adev.hwptr_done_capture -=
 137                                                 runtime->buffer_size;
 138
 139                         dev->adev.capture_transfer_done += length;
 140                         if (dev->adev.capture_transfer_done >=
 141                                 runtime->period_size) {
 142                                 dev->adev.capture_transfer_done -=
 143                                                 runtime->period_size;
 144                                 period_elapsed = 1;
 145                         }
 146                         snd_pcm_stream_unlock(substream);
 147                 }
 148                 if (period_elapsed)
 149                         snd_pcm_period_elapsed(substream);
 150         }
 151         urb->status = 0;
 152
 153         status = usb_submit_urb(urb, GFP_ATOMIC);
 154         if (status < 0) {
 155                 cx231xx_errdev("resubmit of audio urb failed (error=%i)\n",
 156                                status);
 157         }
 158         return;
 159 }
 160
 161 static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 162 {
 163         int i, errCode;
 164         int sb_size;
 165
 166         cx231xx_info("%s: Starting AUDIO transfers\n", __func__);
 167
 168         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 169
 170         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 171                 struct urb *urb;
 172                 int j, k;
 173
 174                 dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC);
 175                 if (!dev->adev.transfer_buffer[i])
 176                         return -ENOMEM;
 177
 178                 memset(dev->adev.transfer_buffer[i], 0x80, sb_size);
 179                 urb = usb_alloc_urb(CX231XX_NUM_AUDIO_PACKETS, GFP_ATOMIC);
 180                 if (!urb) {
 181                         cx231xx_errdev("usb_alloc_urb failed!\n");
 182                         for (j = 0; j < i; j++) {
 183                                 usb_free_urb(dev->adev.urb[j]);
 184                                 kfree(dev->adev.transfer_buffer[j]);
 185                         }
 186                         return -ENOMEM;
 187                 }
 188
 189                 urb->dev = dev->udev;
 190                 urb->context = dev;
 191                 urb->pipe = usb_rcvisocpipe(dev->udev,
 192                                                 dev->adev.end_point_addr);
 193                 urb->transfer_flags = URB_ISO_ASAP;
 194                 urb->transfer_buffer = dev->adev.transfer_buffer[i];
 195                 urb->interval = 1;
 196                 urb->complete = cx231xx_audio_isocirq;
 197                 urb->number_of_packets = CX231XX_NUM_AUDIO_PACKETS;
 198                 urb->transfer_buffer_length = sb_size;
 199
 200                 for (j = k = 0; j < CX231XX_NUM_AUDIO_PACKETS;
 201                         j++, k += dev->adev.max_pkt_size) {
 202                         urb->iso_frame_desc[j].offset = k;
 203                         urb->iso_frame_desc[j].length = dev->adev.max_pkt_size;
 204                 }
 205                 dev->adev.urb[i] = urb;
 206         }
 207
 208         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
 209                 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 210                 if (errCode < 0) {
 211                         cx231xx_isoc_audio_deinit(dev);
 212                         return errCode;
 213                 }
 214         }
 215
 216         return errCode;
 217 }
 218
 219 static int cx231xx_cmd(struct cx231xx *dev, int cmd, int arg)
 220 {
 221         dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ?
 222                 "stop" : "start");
 223
 224         switch (cmd) {
 225         case CX231XX_CAPTURE_STREAM_EN:
 226                 if (dev->adev.capture_stream == STREAM_OFF && arg == 1) {
 227                         dev->adev.capture_stream = STREAM_ON;
 228                         cx231xx_init_audio_isoc(dev);
 229                 } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) {
 230                         dev->adev.capture_stream = STREAM_OFF;
 231                         cx231xx_isoc_audio_deinit(dev);
 232                 } else {
 233                         cx231xx_errdev("An underrun very likely occurred. "
 234                                        "Ignoring it.\n");
 235                 }
 236                 return 0;
 237         default:
 238                 return -EINVAL;
 239         }
 240 }
 241
 242 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 243                                         size_t size)
 244 {
 245         struct snd_pcm_runtime *runtime = subs->runtime;
 246
 247         dprintk("Allocating vbuffer\n");
 248         if (runtime->dma_area) {
 249                 if (runtime->dma_bytes > size)
 250                         return 0;
 251
 252                 vfree(runtime->dma_area);
 253         }
 254         runtime->dma_area = vmalloc(size);
 255         if (!runtime->dma_area)
 256                 return -ENOMEM;
 257
 258         runtime->dma_bytes = size;
 259
 260         return 0;
 261 }
 262
 263 static struct snd_pcm_hardware snd_cx231xx_hw_capture = {
 264         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER   |
 265             SNDRV_PCM_INFO_MMAP                 |
 266             SNDRV_PCM_INFO_INTERLEAVED          |
 267             SNDRV_PCM_INFO_MMAP_VALID,
 268
 269         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 270
 271         .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT,
 272
 273         .rate_min = 48000,
 274         .rate_max = 48000,
 275         .channels_min = 2,
 276         .channels_max = 2,
 277         .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 278         .period_bytes_min = 64,         /* 12544/2, */
 279         .period_bytes_max = 12544,
 280         .periods_min = 2,
 281         .periods_max = 98,              /* 12544, */
 282 };
 283
 284 static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
 285 {
 286         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 287         struct snd_pcm_runtime *runtime = substream->runtime;
 288         int ret = 0;
 289
 290         dprintk("opening device and trying to acquire exclusive lock\n");
 291
 292         if (!dev) {
 293                 cx231xx_errdev("BUG: cx231xx can't find device struct."
 294                                " Can't proceed with open\n");
 295                 return -ENODEV;
 296         }
 297
 298         /* Sets volume, mute, etc */
 299         dev->mute = 0;
 300
 301         /* set alternate setting for audio interface */
 302         /* 1 - 48000 samples per sec */
 303         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 1);
 304         if (ret < 0) {
 305                 cx231xx_errdev("failed to set alternate setting !\n");
 306
 307                 return ret;
 308         }
 309
 310         /* inform hardware to start streaming */
 311         ret = cx231xx_capture_start(dev, 1, Audio);
 312
 313         runtime->hw = snd_cx231xx_hw_capture;
 314
 315         mutex_lock(&dev->lock);
 316         dev->adev.users++;
 317         mutex_unlock(&dev->lock);
 318
 319         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 320         dev->adev.capture_pcm_substream = substream;
 321         runtime->private_data = dev;
 322
 323         return 0;
 324 }
 325
 326 static int snd_cx231xx_pcm_close(struct snd_pcm_substream *substream)
 327 {
 328         int ret;
 329         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 330
 331         dprintk("closing device\n");
 332
 333         /* set alternate setting for audio interface */
 334         /* 1 - 48000 samples per sec */
 335         ret = cx231xx_set_alt_setting(dev, INDEX_AUDIO, 0);
 336         if (ret < 0) {
 337                 cx231xx_errdev("failed to set alternate setting !\n");
 338
 339                 return ret;
 340         }
 341
 342         /* inform hardware to start streaming */
 343         ret = cx231xx_capture_start(dev, 0, Audio);
 344
 345         dev->mute = 1;
 346         mutex_lock(&dev->lock);
 347         dev->adev.users--;
 348         mutex_unlock(&dev->lock);
 349
 350         if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
 351                 dprintk("audio users: %d\n", dev->adev.users);
 352                 dprintk("disabling audio stream!\n");
 353                 dev->adev.shutdown = 0;
 354                 dprintk("released lock\n");
 355                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, 0);
 356         }
 357         return 0;
 358 }
 359
 360 static int snd_cx231xx_hw_capture_params(struct snd_pcm_substream *substream,
 361                                          struct snd_pcm_hw_params *hw_params)
 362 {
 363         unsigned int channels, rate, format;
 364         int ret;
 365
 366         dprintk("Setting capture parameters\n");
 367
 368         ret = snd_pcm_alloc_vmalloc_buffer(substream,
 369                                            params_buffer_bytes(hw_params));
 370         format = params_format(hw_params);
 371         rate = params_rate(hw_params);
 372         channels = params_channels(hw_params);
 373
 374         /* TODO: set up cx231xx audio chip to deliver the correct audio format,
 375            current default is 48000hz multiplexed => 96000hz mono
 376            which shouldn't matter since analogue TV only supports mono */
 377         return 0;
 378 }
 379
 380 static int snd_cx231xx_hw_capture_free(struct snd_pcm_substream *substream)
 381 {
 382         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 383
 384         dprintk("Stop capture, if needed\n");
 385
 386         if (dev->adev.capture_stream == STREAM_ON)
 387                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
 388
 389         return 0;
 390 }
 391
 392 static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 393 {
 394         return 0;
 395 }
 396
 397 static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
 398                                        int cmd)
 399 {
 400         struct cx231xx *dev = snd_pcm_substream_chip(substream);
 401         int retval;
 402
 403         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START) ?
 404                 "start" : "stop");
 405
 406         spin_lock(&dev->adev.slock);
 407         switch (cmd) {
 408         case SNDRV_PCM_TRIGGER_START:
 409                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN,
 410                             CX231XX_START_AUDIO);
 411                 retval = 0;
 412                 break;
 413         case SNDRV_PCM_TRIGGER_STOP:
 414                 cx231xx_cmd(dev, CX231XX_CAPTURE_STREAM_EN, CX231XX_STOP_AUDIO);
 415                 retval = 0;
 416                 break;
 417         default:
 418                 retval = -EINVAL;
 419         }
 420
 421         spin_unlock(&dev->adev.slock);
 422         return retval;
 423 }
 424
 425 static snd_pcm_uframes_t snd_cx231xx_capture_pointer(struct snd_pcm_substream
 426                                                      *substream)
 427 {
 428         struct cx231xx *dev;
 429         unsigned long flags;
 430         snd_pcm_uframes_t hwptr_done;
 431
 432         dev = snd_pcm_substream_chip(substream);
 433
 434         spin_lock_irqsave(&dev->adev.slock, flags);
 435         hwptr_done = dev->adev.hwptr_done_capture;
 436         spin_unlock_irqrestore(&dev->adev.slock, flags);
 437
 438         return hwptr_done;
 439 }
 440
 441 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 442                                              unsigned long offset)
 443 {
 444         void *pageptr = subs->runtime->dma_area + offset;
 445
 446         return vmalloc_to_page(pageptr);
 447 }
 448
 449 static struct snd_pcm_ops snd_cx231xx_pcm_capture = {
 450         .open = snd_cx231xx_capture_open,
 451         .close = snd_cx231xx_pcm_close,
 452         .ioctl = snd_pcm_lib_ioctl,
 453         .hw_params = snd_cx231xx_hw_capture_params,
 454         .hw_free = snd_cx231xx_hw_capture_free,
 455         .prepare = snd_cx231xx_prepare,
 456         .trigger = snd_cx231xx_capture_trigger,
 457         .pointer = snd_cx231xx_capture_pointer,
 458         .page = snd_pcm_get_vmalloc_page,
 459 };
 460
 461 static int cx231xx_audio_init(struct cx231xx *dev)
 462 {
 463         struct cx231xx_audio *adev = &dev->adev;
 464         struct snd_pcm *pcm;
 465         struct snd_card *card;
 466         static int devnr;
 467         int err;
 468         struct usb_interface *uif;
 469         int i, isoc_pipe = 0;
 470
 471         if (dev->has_alsa_audio != 1) {
 472                 /* This device does not support the extension (in this case
 473                    the device is expecting the snd-usb-audio module or
 474                    doesn't have analog audio support at all) */
 475                 return 0;
 476         }
 477
 478         cx231xx_info("cx231xx-audio.c: probing for cx231xx "
 479                      "non standard usbaudio\n");
 480
 481         err = snd_card_create(index[devnr], "Cx231xx Audio", THIS_MODULE,
 482                               0, &card);
 483         if (err < 0)
 484                 return err;
 485
 486         spin_lock_init(&adev->slock);
 487         err = snd_pcm_new(card, "Cx231xx Audio", 0, 0, 1, &pcm);
 488         if (err < 0) {
 489                 snd_card_free(card);
 490                 return err;
 491         }
 492
 493         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 494                         &snd_cx231xx_pcm_capture);
 495         pcm->info_flags = 0;
 496         pcm->private_data = dev;
 497         strcpy(pcm->name, "Conexant cx231xx Capture");
 498         strcpy(card->driver, "Conexant cx231xx Audio");
 499         strcpy(card->shortname, "Cx231xx Audio");
 500         strcpy(card->longname, "Conexant cx231xx Audio");
 501
 502         err = snd_card_register(card);
 503         if (err < 0) {
 504                 snd_card_free(card);
 505                 return err;
 506         }
 507         adev->sndcard = card;
 508         adev->udev = dev->udev;
 509
 510         /* compute alternate max packet sizes for Audio */
 511         uif =
 512             dev->udev->actconfig->interface[dev->current_pcb_config.
 513                                             hs_config_info[0].interface_info.
 514                                             audio_index + 1];
 515
 516         adev->end_point_addr =
 517             le16_to_cpu(uif->altsetting[0].endpoint[isoc_pipe].desc.
 518                         bEndpointAddress);
 519
 520         adev->num_alt = uif->num_altsetting;
 521         cx231xx_info("EndPoint Addr 0x%x, Alternate settings: %i\n",
 522                      adev->end_point_addr, adev->num_alt);
 523         adev->alt_max_pkt_size = kmalloc(32 * adev->num_alt, GFP_KERNEL);
 524
 525         if (adev->alt_max_pkt_size == NULL) {
 526                 cx231xx_errdev("out of memory!\n");
 527                 return -ENOMEM;
 528         }
 529
 530         for (i = 0; i < adev->num_alt; i++) {
 531                 u16 tmp =
 532                     le16_to_cpu(uif->altsetting[i].endpoint[isoc_pipe].desc.
 533                                 wMaxPacketSize);
 534                 adev->alt_max_pkt_size[i] =
 535                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
 536                 cx231xx_info("Alternate setting %i, max size= %i\n", i,
 537                              adev->alt_max_pkt_size[i]);
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int cx231xx_audio_fini(struct cx231xx *dev)
 544 {
 545         if (dev == NULL)
 546                 return 0;
 547
 548         if (dev->has_alsa_audio != 1) {
 549                 /* This device does not support the extension (in this case
 550                    the device is expecting the snd-usb-audio module or
 551                    doesn't have analog audio support at all) */
 552                 return 0;
 553         }
 554
 555         if (dev->adev.sndcard) {
 556                 snd_card_free(dev->adev.sndcard);
 557                 kfree(dev->adev.alt_max_pkt_size);
 558                 dev->adev.sndcard = NULL;
 559         }
 560
 561         return 0;
 562 }
 563
 564 static struct cx231xx_ops audio_ops = {
 565         .id = CX231XX_AUDIO,
 566         .name = "Cx231xx Audio Extension",
 567         .init = cx231xx_audio_init,
 568         .fini = cx231xx_audio_fini,
 569 };
 570
 571 static int __init cx231xx_alsa_register(void)
 572 {
 573         return cx231xx_register_extension(&audio_ops);
 574 }
 575
 576 static void __exit cx231xx_alsa_unregister(void)
 577 {
 578         cx231xx_unregister_extension(&audio_ops);
 579 }
 580
 581 MODULE_LICENSE("GPL");
 582 MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 583 MODULE_DESCRIPTION("Cx231xx Audio driver");
 584
 585 module_init(cx231xx_alsa_register);
 586 module_exit(cx231xx_alsa_unregister);