linux/drivers/media/usb/em28xx/em28xx-audio.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2//
   3// Empiatech em28x1 audio extension
   4//
   5// Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
   6//
   7// Copyright (C) 2007-2016 Mauro Carvalho Chehab
   8//      - Port to work with the in-kernel driver
   9//      - Cleanups, fixes, alsa-controls, etc.
  10//
  11// This driver is based on my previous au600 usb pstn audio driver
  12// and inherits all the copyrights
  13//
  14// This program is free software; you can redistribute it and/or modify
  15// it under the terms of the GNU General Public License as published by
  16// the Free Software Foundation; either version 2 of the License, or
  17// (at your option) any later version.
  18//
  19// This program is distributed in the hope that it will be useful,
  20// but WITHOUT ANY WARRANTY; without even the implied warranty of
  21// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22// GNU General Public License for more details.
  23
  24#include "em28xx.h"
  25
  26#include <linux/kernel.h>
  27#include <linux/usb.h>
  28#include <linux/init.h>
  29#include <linux/sound.h>
  30#include <linux/spinlock.h>
  31#include <linux/soundcard.h>
  32#include <linux/slab.h>
  33#include <linux/vmalloc.h>
  34#include <linux/proc_fs.h>
  35#include <linux/module.h>
  36#include <sound/core.h>
  37#include <sound/pcm.h>
  38#include <sound/pcm_params.h>
  39#include <sound/info.h>
  40#include <sound/initval.h>
  41#include <sound/control.h>
  42#include <sound/tlv.h>
  43#include <sound/ac97_codec.h>
  44#include <media/v4l2-common.h>
  45
  46static int debug;
  47module_param(debug, int, 0644);
  48MODULE_PARM_DESC(debug, "activates debug info");
  49
  50#define EM28XX_MAX_AUDIO_BUFS           5
  51#define EM28XX_MIN_AUDIO_PACKETS        64
  52
  53#define dprintk(fmt, arg...) do {                                       \
  54        if (debug)                                              \
  55                dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
  56                           "video: %s: " fmt, __func__, ## arg);        \
  57} while (0)
  58
  59static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  60
  61static int em28xx_deinit_isoc_audio(struct em28xx *dev)
  62{
  63        int i;
  64
  65        dprintk("Stopping isoc\n");
  66        for (i = 0; i < dev->adev.num_urb; i++) {
  67                struct urb *urb = dev->adev.urb[i];
  68
  69                if (!irqs_disabled())
  70                        usb_kill_urb(urb);
  71                else
  72                        usb_unlink_urb(urb);
  73        }
  74
  75        return 0;
  76}
  77
  78static void em28xx_audio_isocirq(struct urb *urb)
  79{
  80        struct em28xx            *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        if (dev->disconnected) {
  91                dprintk("device disconnected while streaming. URB status=%d.\n",
  92                        urb->status);
  93                atomic_set(&dev->adev.stream_started, 0);
  94                return;
  95        }
  96
  97        switch (urb->status) {
  98        case 0:             /* success */
  99        case -ETIMEDOUT:    /* NAK */
 100                break;
 101        case -ECONNRESET:   /* kill */
 102        case -ENOENT:
 103        case -ESHUTDOWN:
 104                return;
 105        default:            /* error */
 106                dprintk("urb completion error %d.\n", urb->status);
 107                break;
 108        }
 109
 110        if (atomic_read(&dev->adev.stream_started) == 0)
 111                return;
 112
 113        if (dev->adev.capture_pcm_substream) {
 114                substream = dev->adev.capture_pcm_substream;
 115                runtime = substream->runtime;
 116                stride = runtime->frame_bits >> 3;
 117
 118                for (i = 0; i < urb->number_of_packets; i++) {
 119                        unsigned long flags;
 120                        int length =
 121                            urb->iso_frame_desc[i].actual_length / stride;
 122                        cp = (unsigned char *)urb->transfer_buffer +
 123                            urb->iso_frame_desc[i].offset;
 124
 125                        if (!length)
 126                                continue;
 127
 128                        oldptr = dev->adev.hwptr_done_capture;
 129                        if (oldptr + length >= runtime->buffer_size) {
 130                                unsigned int cnt =
 131                                    runtime->buffer_size - oldptr;
 132                                memcpy(runtime->dma_area + oldptr * stride, cp,
 133                                       cnt * stride);
 134                                memcpy(runtime->dma_area, cp + cnt * stride,
 135                                       length * stride - cnt * stride);
 136                        } else {
 137                                memcpy(runtime->dma_area + oldptr * stride, cp,
 138                                       length * stride);
 139                        }
 140
 141                        snd_pcm_stream_lock_irqsave(substream, flags);
 142
 143                        dev->adev.hwptr_done_capture += length;
 144                        if (dev->adev.hwptr_done_capture >=
 145                            runtime->buffer_size)
 146                                dev->adev.hwptr_done_capture -=
 147                                    runtime->buffer_size;
 148
 149                        dev->adev.capture_transfer_done += length;
 150                        if (dev->adev.capture_transfer_done >=
 151                            runtime->period_size) {
 152                                dev->adev.capture_transfer_done -=
 153                                    runtime->period_size;
 154                                period_elapsed = 1;
 155                        }
 156
 157                        snd_pcm_stream_unlock_irqrestore(substream, flags);
 158                }
 159                if (period_elapsed)
 160                        snd_pcm_period_elapsed(substream);
 161        }
 162        urb->status = 0;
 163
 164        status = usb_submit_urb(urb, GFP_ATOMIC);
 165        if (status < 0)
 166                dev_err(&dev->intf->dev,
 167                        "resubmit of audio urb failed (error=%i)\n",
 168                        status);
 169}
 170
 171static int em28xx_init_audio_isoc(struct em28xx *dev)
 172{
 173        int       i, err;
 174
 175        dprintk("Starting isoc transfers\n");
 176
 177        /* Start streaming */
 178        for (i = 0; i < dev->adev.num_urb; i++) {
 179                memset(dev->adev.transfer_buffer[i], 0x80,
 180                       dev->adev.urb[i]->transfer_buffer_length);
 181
 182                err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
 183                if (err) {
 184                        dev_err(&dev->intf->dev,
 185                                "submit of audio urb failed (error=%i)\n",
 186                                err);
 187                        em28xx_deinit_isoc_audio(dev);
 188                        atomic_set(&dev->adev.stream_started, 0);
 189                        return err;
 190                }
 191        }
 192
 193        return 0;
 194}
 195
 196static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
 197                                        size_t size)
 198{
 199        struct em28xx *dev = snd_pcm_substream_chip(subs);
 200        struct snd_pcm_runtime *runtime = subs->runtime;
 201
 202        dprintk("Allocating vbuffer\n");
 203        if (runtime->dma_area) {
 204                if (runtime->dma_bytes > size)
 205                        return 0;
 206
 207                vfree(runtime->dma_area);
 208        }
 209        runtime->dma_area = vmalloc(size);
 210        if (!runtime->dma_area)
 211                return -ENOMEM;
 212
 213        runtime->dma_bytes = size;
 214
 215        return 0;
 216}
 217
 218static const struct snd_pcm_hardware snd_em28xx_hw_capture = {
 219        .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 220                SNDRV_PCM_INFO_MMAP           |
 221                SNDRV_PCM_INFO_INTERLEAVED    |
 222                SNDRV_PCM_INFO_BATCH          |
 223                SNDRV_PCM_INFO_MMAP_VALID,
 224
 225        .formats = SNDRV_PCM_FMTBIT_S16_LE,
 226
 227        .rates = SNDRV_PCM_RATE_48000,
 228
 229        .rate_min = 48000,
 230        .rate_max = 48000,
 231        .channels_min = 2,
 232        .channels_max = 2,
 233        .buffer_bytes_max = 62720 * 8,  /* just about the value in usbaudio.c */
 234
 235        /*
 236         * The period is 12.288 bytes. Allow a 10% of variation along its
 237         * value, in order to avoid overruns/underruns due to some clock
 238         * drift.
 239         *
 240         * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
 241         * Calculate it dynamically.
 242         */
 243        .period_bytes_min = 11059,
 244        .period_bytes_max = 13516,
 245
 246        .periods_min = 2,
 247        .periods_max = 98,              /* 12544, */
 248};
 249
 250static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 251{
 252        struct em28xx *dev = snd_pcm_substream_chip(substream);
 253        struct snd_pcm_runtime *runtime = substream->runtime;
 254        int nonblock, ret = 0;
 255
 256        if (!dev) {
 257                pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
 258                return -ENODEV;
 259        }
 260
 261        if (dev->disconnected)
 262                return -ENODEV;
 263
 264        dprintk("opening device and trying to acquire exclusive lock\n");
 265
 266        nonblock = !!(substream->f_flags & O_NONBLOCK);
 267        if (nonblock) {
 268                if (!mutex_trylock(&dev->lock))
 269                        return -EAGAIN;
 270        } else {
 271                mutex_lock(&dev->lock);
 272        }
 273
 274        runtime->hw = snd_em28xx_hw_capture;
 275
 276        if (dev->adev.users == 0) {
 277                if (!dev->alt || dev->is_audio_only) {
 278                        struct usb_device *udev;
 279
 280                        udev = interface_to_usbdev(dev->intf);
 281
 282                        if (dev->is_audio_only)
 283                                /* audio is on a separate interface */
 284                                dev->alt = 1;
 285                        else
 286                                /* audio is on the same interface as video */
 287                                dev->alt = 7;
 288                                /*
 289                                 * FIXME: The intention seems to be to select
 290                                 * the alt setting with the largest
 291                                 * wMaxPacketSize for the video endpoint.
 292                                 * At least dev->alt should be used instead, but
 293                                 * we should probably not touch it at all if it
 294                                 * is already >0, because wMaxPacketSize of the
 295                                 * audio endpoints seems to be the same for all.
 296                                 */
 297                        dprintk("changing alternate number on interface %d to %d\n",
 298                                dev->ifnum, dev->alt);
 299                        usb_set_interface(udev, dev->ifnum, dev->alt);
 300                }
 301
 302                /* Sets volume, mute, etc */
 303                dev->mute = 0;
 304                ret = em28xx_audio_analog_set(dev);
 305                if (ret < 0)
 306                        goto err;
 307        }
 308
 309        kref_get(&dev->ref);
 310        dev->adev.users++;
 311        mutex_unlock(&dev->lock);
 312
 313        /* Dynamically adjust the period size */
 314        snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 315        snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 316                                     dev->adev.period * 95 / 100,
 317                                     dev->adev.period * 105 / 100);
 318
 319        dev->adev.capture_pcm_substream = substream;
 320
 321        return 0;
 322err:
 323        mutex_unlock(&dev->lock);
 324
 325        dev_err(&dev->intf->dev,
 326                "Error while configuring em28xx mixer\n");
 327        return ret;
 328}
 329
 330static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 331{
 332        struct em28xx *dev = snd_pcm_substream_chip(substream);
 333
 334        dprintk("closing device\n");
 335
 336        dev->mute = 1;
 337        mutex_lock(&dev->lock);
 338        dev->adev.users--;
 339        if (atomic_read(&dev->adev.stream_started) > 0) {
 340                atomic_set(&dev->adev.stream_started, 0);
 341                schedule_work(&dev->adev.wq_trigger);
 342        }
 343
 344        em28xx_audio_analog_set(dev);
 345        if (substream->runtime->dma_area) {
 346                dprintk("freeing\n");
 347                vfree(substream->runtime->dma_area);
 348                substream->runtime->dma_area = NULL;
 349        }
 350        mutex_unlock(&dev->lock);
 351        kref_put(&dev->ref, em28xx_free_device);
 352
 353        return 0;
 354}
 355
 356static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
 357                                        struct snd_pcm_hw_params *hw_params)
 358{
 359        int ret;
 360        struct em28xx *dev = snd_pcm_substream_chip(substream);
 361
 362        if (dev->disconnected)
 363                return -ENODEV;
 364
 365        dprintk("Setting capture parameters\n");
 366
 367        ret = snd_pcm_alloc_vmalloc_buffer(substream,
 368                                           params_buffer_bytes(hw_params));
 369        if (ret < 0)
 370                return ret;
 371#if 0
 372        /*
 373         * TODO: set up em28xx audio chip to deliver the correct audio format,
 374         * current default is 48000hz multiplexed => 96000hz mono
 375         * which shouldn't matter since analogue TV only supports mono
 376         */
 377        unsigned int channels, rate, format;
 378
 379        format = params_format(hw_params);
 380        rate = params_rate(hw_params);
 381        channels = params_channels(hw_params);
 382#endif
 383
 384        return 0;
 385}
 386
 387static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
 388{
 389        struct em28xx *dev = snd_pcm_substream_chip(substream);
 390        struct em28xx_audio *adev = &dev->adev;
 391
 392        dprintk("Stop capture, if needed\n");
 393
 394        if (atomic_read(&adev->stream_started) > 0) {
 395                atomic_set(&adev->stream_started, 0);
 396                schedule_work(&adev->wq_trigger);
 397        }
 398
 399        return 0;
 400}
 401
 402static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
 403{
 404        struct em28xx *dev = snd_pcm_substream_chip(substream);
 405
 406        if (dev->disconnected)
 407                return -ENODEV;
 408
 409        dev->adev.hwptr_done_capture = 0;
 410        dev->adev.capture_transfer_done = 0;
 411
 412        return 0;
 413}
 414
 415static void audio_trigger(struct work_struct *work)
 416{
 417        struct em28xx_audio *adev =
 418                            container_of(work, struct em28xx_audio, wq_trigger);
 419        struct em28xx *dev = container_of(adev, struct em28xx, adev);
 420
 421        if (atomic_read(&adev->stream_started)) {
 422                dprintk("starting capture");
 423                em28xx_init_audio_isoc(dev);
 424        } else {
 425                dprintk("stopping capture");
 426                em28xx_deinit_isoc_audio(dev);
 427        }
 428}
 429
 430static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 431                                      int cmd)
 432{
 433        struct em28xx *dev = snd_pcm_substream_chip(substream);
 434        int retval = 0;
 435
 436        if (dev->disconnected)
 437                return -ENODEV;
 438
 439        switch (cmd) {
 440        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 441        case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 442        case SNDRV_PCM_TRIGGER_START:
 443                atomic_set(&dev->adev.stream_started, 1);
 444                break;
 445        case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 446        case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 447        case SNDRV_PCM_TRIGGER_STOP:
 448                atomic_set(&dev->adev.stream_started, 0);
 449                break;
 450        default:
 451                retval = -EINVAL;
 452        }
 453        schedule_work(&dev->adev.wq_trigger);
 454        return retval;
 455}
 456
 457static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
 458                                                    *substream)
 459{
 460        unsigned long flags;
 461        struct em28xx *dev;
 462        snd_pcm_uframes_t hwptr_done;
 463
 464        dev = snd_pcm_substream_chip(substream);
 465        if (dev->disconnected)
 466                return SNDRV_PCM_POS_XRUN;
 467
 468        spin_lock_irqsave(&dev->adev.slock, flags);
 469        hwptr_done = dev->adev.hwptr_done_capture;
 470        spin_unlock_irqrestore(&dev->adev.slock, flags);
 471
 472        return hwptr_done;
 473}
 474
 475static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 476                                             unsigned long offset)
 477{
 478        void *pageptr = subs->runtime->dma_area + offset;
 479
 480        return vmalloc_to_page(pageptr);
 481}
 482
 483/*
 484 * AC97 volume control support
 485 */
 486static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
 487                           struct snd_ctl_elem_info *info)
 488{
 489        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 490
 491        if (dev->disconnected)
 492                return -ENODEV;
 493
 494        info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 495        info->count = 2;
 496        info->value.integer.min = 0;
 497        info->value.integer.max = 0x1f;
 498
 499        return 0;
 500}
 501
 502static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
 503                          struct snd_ctl_elem_value *value)
 504{
 505        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 506        struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 507        u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
 508                  (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
 509        int nonblock = 0;
 510        int rc;
 511
 512        if (dev->disconnected)
 513                return -ENODEV;
 514
 515        if (substream)
 516                nonblock = !!(substream->f_flags & O_NONBLOCK);
 517        if (nonblock) {
 518                if (!mutex_trylock(&dev->lock))
 519                        return -EAGAIN;
 520        } else {
 521                mutex_lock(&dev->lock);
 522        }
 523        rc = em28xx_read_ac97(dev, kcontrol->private_value);
 524        if (rc < 0)
 525                goto err;
 526
 527        val |= rc & 0x8000;     /* Preserve the mute flag */
 528
 529        rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
 530        if (rc < 0)
 531                goto err;
 532
 533        dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 534                (val & 0x8000) ? "muted " : "",
 535                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 536                val, (int)kcontrol->private_value);
 537
 538err:
 539        mutex_unlock(&dev->lock);
 540        return rc;
 541}
 542
 543static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
 544                          struct snd_ctl_elem_value *value)
 545{
 546        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 547        struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 548        int nonblock = 0;
 549        int val;
 550
 551        if (dev->disconnected)
 552                return -ENODEV;
 553
 554        if (substream)
 555                nonblock = !!(substream->f_flags & O_NONBLOCK);
 556        if (nonblock) {
 557                if (!mutex_trylock(&dev->lock))
 558                        return -EAGAIN;
 559        } else {
 560                mutex_lock(&dev->lock);
 561        }
 562        val = em28xx_read_ac97(dev, kcontrol->private_value);
 563        mutex_unlock(&dev->lock);
 564        if (val < 0)
 565                return val;
 566
 567        dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 568                (val & 0x8000) ? "muted " : "",
 569                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 570                val, (int)kcontrol->private_value);
 571
 572        value->value.integer.value[0] = 0x1f - (val & 0x1f);
 573        value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
 574
 575        return 0;
 576}
 577
 578static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
 579                               struct snd_ctl_elem_value *value)
 580{
 581        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 582        u16 val = value->value.integer.value[0];
 583        struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 584        int nonblock = 0;
 585        int rc;
 586
 587        if (dev->disconnected)
 588                return -ENODEV;
 589
 590        if (substream)
 591                nonblock = !!(substream->f_flags & O_NONBLOCK);
 592        if (nonblock) {
 593                if (!mutex_trylock(&dev->lock))
 594                        return -EAGAIN;
 595        } else {
 596                mutex_lock(&dev->lock);
 597        }
 598        rc = em28xx_read_ac97(dev, kcontrol->private_value);
 599        if (rc < 0)
 600                goto err;
 601
 602        if (val)
 603                rc &= 0x1f1f;
 604        else
 605                rc |= 0x8000;
 606
 607        rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
 608        if (rc < 0)
 609                goto err;
 610
 611        dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
 612                (val & 0x8000) ? "muted " : "",
 613                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 614                val, (int)kcontrol->private_value);
 615
 616err:
 617        mutex_unlock(&dev->lock);
 618        return rc;
 619}
 620
 621static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
 622                               struct snd_ctl_elem_value *value)
 623{
 624        struct em28xx *dev = snd_kcontrol_chip(kcontrol);
 625        struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
 626        int nonblock = 0;
 627        int val;
 628
 629        if (dev->disconnected)
 630                return -ENODEV;
 631
 632        if (substream)
 633                nonblock = !!(substream->f_flags & O_NONBLOCK);
 634        if (nonblock) {
 635                if (!mutex_trylock(&dev->lock))
 636                        return -EAGAIN;
 637        } else {
 638                mutex_lock(&dev->lock);
 639        }
 640        val = em28xx_read_ac97(dev, kcontrol->private_value);
 641        mutex_unlock(&dev->lock);
 642        if (val < 0)
 643                return val;
 644
 645        if (val & 0x8000)
 646                value->value.integer.value[0] = 0;
 647        else
 648                value->value.integer.value[0] = 1;
 649
 650        dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
 651                (val & 0x8000) ? "muted " : "",
 652                0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
 653                val, (int)kcontrol->private_value);
 654
 655        return 0;
 656}
 657
 658static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
 659
 660static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
 661                           char *name, int id)
 662{
 663        int err;
 664        char ctl_name[44];
 665        struct snd_kcontrol *kctl;
 666        struct snd_kcontrol_new tmp;
 667
 668        memset(&tmp, 0, sizeof(tmp));
 669        tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 670        tmp.private_value = id,
 671        tmp.name  = ctl_name,
 672
 673        /* Add Mute Control */
 674        sprintf(ctl_name, "%s Switch", name);
 675        tmp.get  = em28xx_vol_get_mute;
 676        tmp.put  = em28xx_vol_put_mute;
 677        tmp.info = snd_ctl_boolean_mono_info;
 678        kctl = snd_ctl_new1(&tmp, dev);
 679        err = snd_ctl_add(card, kctl);
 680        if (err < 0)
 681                return err;
 682        dprintk("Added control %s for ac97 volume control 0x%04x\n",
 683                ctl_name, id);
 684
 685        memset(&tmp, 0, sizeof(tmp));
 686        tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 687        tmp.private_value = id,
 688        tmp.name  = ctl_name,
 689
 690        /* Add Volume Control */
 691        sprintf(ctl_name, "%s Volume", name);
 692        tmp.get   = em28xx_vol_get;
 693        tmp.put   = em28xx_vol_put;
 694        tmp.info  = em28xx_vol_info;
 695        tmp.tlv.p = em28xx_db_scale,
 696        kctl = snd_ctl_new1(&tmp, dev);
 697        err = snd_ctl_add(card, kctl);
 698        if (err < 0)
 699                return err;
 700        dprintk("Added control %s for ac97 volume control 0x%04x\n",
 701                ctl_name, id);
 702
 703        return 0;
 704}
 705
 706/*
 707 * register/unregister code and data
 708 */
 709static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
 710        .open      = snd_em28xx_capture_open,
 711        .close     = snd_em28xx_pcm_close,
 712        .ioctl     = snd_pcm_lib_ioctl,
 713        .hw_params = snd_em28xx_hw_capture_params,
 714        .hw_free   = snd_em28xx_hw_capture_free,
 715        .prepare   = snd_em28xx_prepare,
 716        .trigger   = snd_em28xx_capture_trigger,
 717        .pointer   = snd_em28xx_capture_pointer,
 718        .page      = snd_pcm_get_vmalloc_page,
 719};
 720
 721static void em28xx_audio_free_urb(struct em28xx *dev)
 722{
 723        struct usb_device *udev = interface_to_usbdev(dev->intf);
 724        int i;
 725
 726        for (i = 0; i < dev->adev.num_urb; i++) {
 727                struct urb *urb = dev->adev.urb[i];
 728
 729                if (!urb)
 730                        continue;
 731
 732                usb_free_coherent(udev, urb->transfer_buffer_length,
 733                                  dev->adev.transfer_buffer[i],
 734                                  urb->transfer_dma);
 735
 736                usb_free_urb(urb);
 737        }
 738        kfree(dev->adev.urb);
 739        kfree(dev->adev.transfer_buffer);
 740        dev->adev.num_urb = 0;
 741}
 742
 743/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 744static int em28xx_audio_ep_packet_size(struct usb_device *udev,
 745                                       struct usb_endpoint_descriptor *e)
 746{
 747        int size = le16_to_cpu(e->wMaxPacketSize);
 748
 749        if (udev->speed == USB_SPEED_HIGH)
 750                return (size & 0x7ff) *  (1 + (((size) >> 11) & 0x03));
 751
 752        return size & 0x7ff;
 753}
 754
 755static int em28xx_audio_urb_init(struct em28xx *dev)
 756{
 757        struct usb_interface *intf;
 758        struct usb_endpoint_descriptor *e, *ep = NULL;
 759        struct usb_device *udev = interface_to_usbdev(dev->intf);
 760        int                 i, ep_size, interval, num_urb, npackets;
 761        int                 urb_size, bytes_per_transfer;
 762        u8 alt;
 763
 764        if (dev->ifnum)
 765                alt = 1;
 766        else
 767                alt = 7;
 768
 769        intf = usb_ifnum_to_if(udev, dev->ifnum);
 770
 771        if (intf->num_altsetting <= alt) {
 772                dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
 773                        dev->ifnum, alt);
 774                return -ENODEV;
 775        }
 776
 777        for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
 778                e = &intf->altsetting[alt].endpoint[i].desc;
 779                if (!usb_endpoint_dir_in(e))
 780                        continue;
 781                if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
 782                        ep = e;
 783                        break;
 784                }
 785        }
 786
 787        if (!ep) {
 788                dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
 789                return -ENODEV;
 790        }
 791
 792        ep_size = em28xx_audio_ep_packet_size(udev, ep);
 793        interval = 1 << (ep->bInterval - 1);
 794
 795        dev_info(&dev->intf->dev,
 796                 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
 797                 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
 798                 dev->ifnum, alt, interval, ep_size);
 799
 800        /* Calculate the number and size of URBs to better fit the audio samples */
 801
 802        /*
 803         * Estimate the number of bytes per DMA transfer.
 804         *
 805         * This is given by the bit rate (for now, only 48000 Hz) multiplied
 806         * by 2 channels and 2 bytes/sample divided by the number of microframe
 807         * intervals and by the microframe rate (125 us)
 808         */
 809        bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
 810
 811        /*
 812         * Estimate the number of transfer URBs. Don't let it go past the
 813         * maximum number of URBs that is known to be supported by the device.
 814         */
 815        num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
 816        if (num_urb > EM28XX_MAX_AUDIO_BUFS)
 817                num_urb = EM28XX_MAX_AUDIO_BUFS;
 818
 819        /*
 820         * Now that we know the number of bytes per transfer and the number of
 821         * URBs, estimate the typical size of an URB, in order to adjust the
 822         * minimal number of packets.
 823         */
 824        urb_size = bytes_per_transfer / num_urb;
 825
 826        /*
 827         * Now, calculate the amount of audio packets to be filled on each
 828         * URB. In order to preserve the old behaviour, use a minimal
 829         * threshold for this value.
 830         */
 831        npackets = EM28XX_MIN_AUDIO_PACKETS;
 832        if (urb_size > ep_size * npackets)
 833                npackets = DIV_ROUND_UP(urb_size, ep_size);
 834
 835        dev_info(&dev->intf->dev,
 836                 "Number of URBs: %d, with %d packets and %d size\n",
 837                 num_urb, npackets, urb_size);
 838
 839        /* Estimate the bytes per period */
 840        dev->adev.period = urb_size * npackets;
 841
 842        /* Allocate space to store the number of URBs to be used */
 843
 844        dev->adev.transfer_buffer = kcalloc(num_urb,
 845                                            sizeof(*dev->adev.transfer_buffer),
 846                                            GFP_KERNEL);
 847        if (!dev->adev.transfer_buffer)
 848                return -ENOMEM;
 849
 850        dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_KERNEL);
 851        if (!dev->adev.urb) {
 852                kfree(dev->adev.transfer_buffer);
 853                return -ENOMEM;
 854        }
 855
 856        /* Alloc memory for each URB and for each transfer buffer */
 857        dev->adev.num_urb = num_urb;
 858        for (i = 0; i < num_urb; i++) {
 859                struct urb *urb;
 860                int j, k;
 861                void *buf;
 862
 863                urb = usb_alloc_urb(npackets, GFP_KERNEL);
 864                if (!urb) {
 865                        em28xx_audio_free_urb(dev);
 866                        return -ENOMEM;
 867                }
 868                dev->adev.urb[i] = urb;
 869
 870                buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_KERNEL,
 871                                         &urb->transfer_dma);
 872                if (!buf) {
 873                        dev_err(&dev->intf->dev,
 874                                "usb_alloc_coherent failed!\n");
 875                        em28xx_audio_free_urb(dev);
 876                        return -ENOMEM;
 877                }
 878                dev->adev.transfer_buffer[i] = buf;
 879
 880                urb->dev = udev;
 881                urb->context = dev;
 882                urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
 883                urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 884                urb->transfer_buffer = buf;
 885                urb->interval = interval;
 886                urb->complete = em28xx_audio_isocirq;
 887                urb->number_of_packets = npackets;
 888                urb->transfer_buffer_length = ep_size * npackets;
 889
 890                for (j = k = 0; j < npackets; j++, k += ep_size) {
 891                        urb->iso_frame_desc[j].offset = k;
 892                        urb->iso_frame_desc[j].length = ep_size;
 893                }
 894        }
 895
 896        return 0;
 897}
 898
 899static int em28xx_audio_init(struct em28xx *dev)
 900{
 901        struct em28xx_audio *adev = &dev->adev;
 902        struct usb_device *udev = interface_to_usbdev(dev->intf);
 903        struct snd_pcm      *pcm;
 904        struct snd_card     *card;
 905        static int          devnr;
 906        int                 err;
 907
 908        if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 909                /*
 910                 * This device does not support the extension (in this case
 911                 * the device is expecting the snd-usb-audio module or
 912                 * doesn't have analog audio support at all)
 913                 */
 914                return 0;
 915        }
 916
 917        dev_info(&dev->intf->dev, "Binding audio extension\n");
 918
 919        kref_get(&dev->ref);
 920
 921        dev_info(&dev->intf->dev,
 922                 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
 923        dev_info(&dev->intf->dev,
 924                 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
 925
 926        err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
 927                           THIS_MODULE, 0, &card);
 928        if (err < 0)
 929                return err;
 930
 931        spin_lock_init(&adev->slock);
 932        adev->sndcard = card;
 933        adev->udev = udev;
 934
 935        err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
 936        if (err < 0)
 937                goto card_free;
 938
 939        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
 940        pcm->info_flags = 0;
 941        pcm->private_data = dev;
 942        strscpy(pcm->name, "Empia 28xx Capture", sizeof(pcm->name));
 943
 944        strscpy(card->driver, "Em28xx-Audio", sizeof(card->driver));
 945        strscpy(card->shortname, "Em28xx Audio", sizeof(card->shortname));
 946        strscpy(card->longname, "Empia Em28xx Audio", sizeof(card->longname));
 947
 948        INIT_WORK(&adev->wq_trigger, audio_trigger);
 949
 950        if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
 951                em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
 952                em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
 953                em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
 954                em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
 955                em28xx_cvol_new(card, dev, "CD", AC97_CD);
 956                em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
 957                em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
 958
 959                em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
 960                em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
 961                em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
 962                em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
 963                em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
 964        }
 965
 966        err = em28xx_audio_urb_init(dev);
 967        if (err)
 968                goto card_free;
 969
 970        err = snd_card_register(card);
 971        if (err < 0)
 972                goto urb_free;
 973
 974        dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
 975        return 0;
 976
 977urb_free:
 978        em28xx_audio_free_urb(dev);
 979
 980card_free:
 981        snd_card_free(card);
 982        adev->sndcard = NULL;
 983
 984        return err;
 985}
 986
 987static int em28xx_audio_fini(struct em28xx *dev)
 988{
 989        if (!dev)
 990                return 0;
 991
 992        if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
 993                /*
 994                 * This device does not support the extension (in this case
 995                 * the device is expecting the snd-usb-audio module or
 996                 * doesn't have analog audio support at all)
 997                 */
 998                return 0;
 999        }
1000
1001        dev_info(&dev->intf->dev, "Closing audio extension\n");
1002
1003        if (dev->adev.sndcard) {
1004                snd_card_disconnect(dev->adev.sndcard);
1005                flush_work(&dev->adev.wq_trigger);
1006
1007                em28xx_audio_free_urb(dev);
1008
1009                snd_card_free(dev->adev.sndcard);
1010                dev->adev.sndcard = NULL;
1011        }
1012
1013        kref_put(&dev->ref, em28xx_free_device);
1014        return 0;
1015}
1016
1017static int em28xx_audio_suspend(struct em28xx *dev)
1018{
1019        if (!dev)
1020                return 0;
1021
1022        if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1023                return 0;
1024
1025        dev_info(&dev->intf->dev, "Suspending audio extension\n");
1026        em28xx_deinit_isoc_audio(dev);
1027        atomic_set(&dev->adev.stream_started, 0);
1028        return 0;
1029}
1030
1031static int em28xx_audio_resume(struct em28xx *dev)
1032{
1033        if (!dev)
1034                return 0;
1035
1036        if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1037                return 0;
1038
1039        dev_info(&dev->intf->dev, "Resuming audio extension\n");
1040        /* Nothing to do other than schedule_work() ?? */
1041        schedule_work(&dev->adev.wq_trigger);
1042        return 0;
1043}
1044
1045static struct em28xx_ops audio_ops = {
1046        .id   = EM28XX_AUDIO,
1047        .name = "Em28xx Audio Extension",
1048        .init = em28xx_audio_init,
1049        .fini = em28xx_audio_fini,
1050        .suspend = em28xx_audio_suspend,
1051        .resume = em28xx_audio_resume,
1052};
1053
1054static int __init em28xx_alsa_register(void)
1055{
1056        return em28xx_register_extension(&audio_ops);
1057}
1058
1059static void __exit em28xx_alsa_unregister(void)
1060{
1061        em28xx_unregister_extension(&audio_ops);
1062}
1063
1064MODULE_LICENSE("GPL v2");
1065MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1066MODULE_AUTHOR("Mauro Carvalho Chehab");
1067MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1068MODULE_VERSION(EM28XX_VERSION);
1069
1070module_init(em28xx_alsa_register);
1071module_exit(em28xx_alsa_unregister);
1072