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