linux/drivers/media/video/cx231xx/cx231xx-audio.c
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   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
  42static int debug;
  43module_param(debug, int, 0644);
  44MODULE_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
  52static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  53
  54static 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
  78static 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
 161static 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
 219static 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
 242static 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
 263static 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
 284static 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
 326static 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
 360static 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
 380static 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
 392static int snd_cx231xx_prepare(struct snd_pcm_substream *substream)
 393{
 394        return 0;
 395}
 396
 397static 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
 425static 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
 441static 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
 449static 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
 461static 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, "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
 543static 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
 564static 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
 571static int __init cx231xx_alsa_register(void)
 572{
 573        return cx231xx_register_extension(&audio_ops);
 574}
 575
 576static void __exit cx231xx_alsa_unregister(void)
 577{
 578        cx231xx_unregister_extension(&audio_ops);
 579}
 580
 581MODULE_LICENSE("GPL");
 582MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
 583MODULE_DESCRIPTION("Cx231xx Audio driver");
 584
 585module_init(cx231xx_alsa_register);
 586module_exit(cx231xx_alsa_unregister);
 587