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pcm.c

/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "usbaudio.h"
#include "card.h"
#include "quirks.h"
#include "debug.h"
#include "urb.h"
#include "helper.h"
#include "pcm.h"
#include "clock.h"

/*
 * return the current pcm pointer.  just based on the hwptr_done value.
 */
static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct snd_usb_substream *subs;
      unsigned int hwptr_done;

      subs = (struct snd_usb_substream *)substream->runtime->private_data;
      spin_lock(&subs->lock);
      hwptr_done = subs->hwptr_done;
      spin_unlock(&subs->lock);
      return hwptr_done / (substream->runtime->frame_bits >> 3);
}

/*
 * find a matching audio format
 */
static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
                               unsigned int rate, unsigned int channels)
{
      struct list_head *p;
      struct audioformat *found = NULL;
      int cur_attr = 0, attr;

      list_for_each(p, &subs->fmt_list) {
            struct audioformat *fp;
            fp = list_entry(p, struct audioformat, list);
            if (!(fp->formats & (1uLL << format)))
                  continue;
            if (fp->channels != channels)
                  continue;
            if (rate < fp->rate_min || rate > fp->rate_max)
                  continue;
            if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
                  unsigned int i;
                  for (i = 0; i < fp->nr_rates; i++)
                        if (fp->rate_table[i] == rate)
                              break;
                  if (i >= fp->nr_rates)
                        continue;
            }
            attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
            if (! found) {
                  found = fp;
                  cur_attr = attr;
                  continue;
            }
            /* avoid async out and adaptive in if the other method
             * supports the same format.
             * this is a workaround for the case like
             * M-audio audiophile USB.
             */
            if (attr != cur_attr) {
                  if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
                       subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
                      (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
                       subs->direction == SNDRV_PCM_STREAM_CAPTURE))
                        continue;
                  if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
                       subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
                      (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
                       subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
                        found = fp;
                        cur_attr = attr;
                        continue;
                  }
            }
            /* find the format with the largest max. packet size */
            if (fp->maxpacksize > found->maxpacksize) {
                  found = fp;
                  cur_attr = attr;
            }
      }
      return found;
}

static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
                   struct usb_host_interface *alts,
                   struct audioformat *fmt)
{
      struct usb_device *dev = chip->dev;
      unsigned int ep;
      unsigned char data[1];
      int err;

      ep = get_endpoint(alts, 0)->bEndpointAddress;

      data[0] = 1;
      if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
                           USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
                           UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
                           data, sizeof(data), 1000)) < 0) {
            snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
                     dev->devnum, iface, ep);
            return err;
      }

      return 0;
}

static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
                   struct usb_host_interface *alts,
                   struct audioformat *fmt)
{
      struct usb_device *dev = chip->dev;
      unsigned char data[1];
      unsigned int ep;
      int err;

      ep = get_endpoint(alts, 0)->bEndpointAddress;

      data[0] = 1;
      if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
                           USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
                           UAC2_EP_CS_PITCH << 8, 0,
                           data, sizeof(data), 1000)) < 0) {
            snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
                     dev->devnum, iface, fmt->altsetting);
            return err;
      }

      return 0;
}

/*
 * initialize the pitch control and sample rate
 */
int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
                   struct usb_host_interface *alts,
                   struct audioformat *fmt)
{
      struct usb_interface_descriptor *altsd = get_iface_desc(alts);

      /* if endpoint doesn't have pitch control, bail out */
      if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
            return 0;

      switch (altsd->bInterfaceProtocol) {
      case UAC_VERSION_1:
      default:
            return init_pitch_v1(chip, iface, alts, fmt);

      case UAC_VERSION_2:
            return init_pitch_v2(chip, iface, alts, fmt);
      }
}

/*
 * find a matching format and set up the interface
 */
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
{
      struct usb_device *dev = subs->dev;
      struct usb_host_interface *alts;
      struct usb_interface_descriptor *altsd;
      struct usb_interface *iface;
      unsigned int ep, attr;
      int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
      int err;

      iface = usb_ifnum_to_if(dev, fmt->iface);
      if (WARN_ON(!iface))
            return -EINVAL;
      alts = &iface->altsetting[fmt->altset_idx];
      altsd = get_iface_desc(alts);
      if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
            return -EINVAL;

      if (fmt == subs->cur_audiofmt)
            return 0;

      /* close the old interface */
      if (subs->interface >= 0 && subs->interface != fmt->iface) {
            if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
                  snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
                        dev->devnum, fmt->iface, fmt->altsetting);
                  return -EIO;
            }
            subs->interface = -1;
            subs->altset_idx = 0;
      }

      /* set interface */
      if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
            if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
                  snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
                           dev->devnum, fmt->iface, fmt->altsetting);
                  return -EIO;
            }
            snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
            subs->interface = fmt->iface;
            subs->altset_idx = fmt->altset_idx;
      }

      /* create a data pipe */
      ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
      if (is_playback)
            subs->datapipe = usb_sndisocpipe(dev, ep);
      else
            subs->datapipe = usb_rcvisocpipe(dev, ep);
      subs->datainterval = fmt->datainterval;
      subs->syncpipe = subs->syncinterval = 0;
      subs->maxpacksize = fmt->maxpacksize;
      subs->syncmaxsize = 0;
      subs->fill_max = 0;

      /* we need a sync pipe in async OUT or adaptive IN mode */
      /* check the number of EP, since some devices have broken
       * descriptors which fool us.  if it has only one EP,
       * assume it as adaptive-out or sync-in.
       */
      attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
      if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
           (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
          altsd->bNumEndpoints >= 2) {
            /* check sync-pipe endpoint */
            /* ... and check descriptor size before accessing bSynchAddress
               because there is a version of the SB Audigy 2 NX firmware lacking
               the audio fields in the endpoint descriptors */
            if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
                (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
                 get_endpoint(alts, 1)->bSynchAddress != 0)) {
                  snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
                           dev->devnum, fmt->iface, fmt->altsetting);
                  return -EINVAL;
            }
            ep = get_endpoint(alts, 1)->bEndpointAddress;
            if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
                (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
                 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
                  snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
                           dev->devnum, fmt->iface, fmt->altsetting);
                  return -EINVAL;
            }
            ep &= USB_ENDPOINT_NUMBER_MASK;
            if (is_playback)
                  subs->syncpipe = usb_rcvisocpipe(dev, ep);
            else
                  subs->syncpipe = usb_sndisocpipe(dev, ep);
            if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
                get_endpoint(alts, 1)->bRefresh >= 1 &&
                get_endpoint(alts, 1)->bRefresh <= 9)
                  subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
            else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
                  subs->syncinterval = 1;
            else if (get_endpoint(alts, 1)->bInterval >= 1 &&
                   get_endpoint(alts, 1)->bInterval <= 16)
                  subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
            else
                  subs->syncinterval = 3;
            subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
      }

      /* always fill max packet size */
      if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
            subs->fill_max = 1;

      if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
            return err;

      subs->cur_audiofmt = fmt;

      snd_usb_set_format_quirk(subs, fmt);

#if 0
      printk(KERN_DEBUG
             "setting done: format = %d, rate = %d..%d, channels = %d\n",
             fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
      printk(KERN_DEBUG
             "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
             subs->datapipe, subs->syncpipe);
#endif

      return 0;
}

/*
 * hw_params callback
 *
 * allocate a buffer and set the given audio format.
 *
 * so far we use a physically linear buffer although packetize transfer
 * doesn't need a continuous area.
 * if sg buffer is supported on the later version of alsa, we'll follow
 * that.
 */
static int snd_usb_hw_params(struct snd_pcm_substream *substream,
                       struct snd_pcm_hw_params *hw_params)
{
      struct snd_usb_substream *subs = substream->runtime->private_data;
      struct audioformat *fmt;
      unsigned int channels, rate, format;
      int ret, changed;

      ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
                                     params_buffer_bytes(hw_params));
      if (ret < 0)
            return ret;

      format = params_format(hw_params);
      rate = params_rate(hw_params);
      channels = params_channels(hw_params);
      fmt = find_format(subs, format, rate, channels);
      if (!fmt) {
            snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
                     format, rate, channels);
            return -EINVAL;
      }

      changed = subs->cur_audiofmt != fmt ||
            subs->period_bytes != params_period_bytes(hw_params) ||
            subs->cur_rate != rate;
      if ((ret = set_format(subs, fmt)) < 0)
            return ret;

      if (subs->cur_rate != rate) {
            struct usb_host_interface *alts;
            struct usb_interface *iface;
            iface = usb_ifnum_to_if(subs->dev, fmt->iface);
            alts = &iface->altsetting[fmt->altset_idx];
            ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
            if (ret < 0)
                  return ret;
            subs->cur_rate = rate;
      }

      if (changed) {
            /* format changed */
            snd_usb_release_substream_urbs(subs, 0);
            /* influenced: period_bytes, channels, rate, format, */
            ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
                                      params_rate(hw_params),
                                      snd_pcm_format_physical_width(params_format(hw_params)) *
                                          params_channels(hw_params));
      }

      return ret;
}

/*
 * hw_free callback
 *
 * reset the audio format and release the buffer
 */
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
{
      struct snd_usb_substream *subs = substream->runtime->private_data;

      subs->cur_audiofmt = NULL;
      subs->cur_rate = 0;
      subs->period_bytes = 0;
      if (!subs->stream->chip->shutdown)
            snd_usb_release_substream_urbs(subs, 0);
      return snd_pcm_lib_free_vmalloc_buffer(substream);
}

/*
 * prepare callback
 *
 * only a few subtle things...
 */
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_usb_substream *subs = runtime->private_data;

      if (! subs->cur_audiofmt) {
            snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
            return -ENXIO;
      }

      /* some unit conversions in runtime */
      subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
      subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);

      /* reset the pointer */
      subs->hwptr_done = 0;
      subs->transfer_done = 0;
      subs->phase = 0;
      runtime->delay = 0;

      return snd_usb_substream_prepare(subs, runtime);
}

static struct snd_pcm_hardware snd_usb_hardware =
{
      .info =                 SNDRV_PCM_INFO_MMAP |
                        SNDRV_PCM_INFO_MMAP_VALID |
                        SNDRV_PCM_INFO_BATCH |
                        SNDRV_PCM_INFO_INTERLEAVED |
                        SNDRV_PCM_INFO_BLOCK_TRANSFER |
                        SNDRV_PCM_INFO_PAUSE,
      .buffer_bytes_max =     1024 * 1024,
      .period_bytes_min =     64,
      .period_bytes_max =     512 * 1024,
      .periods_min =          2,
      .periods_max =          1024,
};

static int hw_check_valid_format(struct snd_usb_substream *subs,
                         struct snd_pcm_hw_params *params,
                         struct audioformat *fp)
{
      struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
      struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
      struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
      struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
      struct snd_mask check_fmts;
      unsigned int ptime;

      /* check the format */
      snd_mask_none(&check_fmts);
      check_fmts.bits[0] = (u32)fp->formats;
      check_fmts.bits[1] = (u32)(fp->formats >> 32);
      snd_mask_intersect(&check_fmts, fmts);
      if (snd_mask_empty(&check_fmts)) {
            hwc_debug("   > check: no supported format %d\n", fp->format);
            return 0;
      }
      /* check the channels */
      if (fp->channels < ct->min || fp->channels > ct->max) {
            hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
            return 0;
      }
      /* check the rate is within the range */
      if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
            hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
            return 0;
      }
      if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
            hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
            return 0;
      }
      /* check whether the period time is >= the data packet interval */
      if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
            ptime = 125 * (1 << fp->datainterval);
            if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
                  hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
                  return 0;
            }
      }
      return 1;
}

static int hw_rule_rate(struct snd_pcm_hw_params *params,
                  struct snd_pcm_hw_rule *rule)
{
      struct snd_usb_substream *subs = rule->private;
      struct list_head *p;
      struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
      unsigned int rmin, rmax;
      int changed;

      hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
      changed = 0;
      rmin = rmax = 0;
      list_for_each(p, &subs->fmt_list) {
            struct audioformat *fp;
            fp = list_entry(p, struct audioformat, list);
            if (!hw_check_valid_format(subs, params, fp))
                  continue;
            if (changed++) {
                  if (rmin > fp->rate_min)
                        rmin = fp->rate_min;
                  if (rmax < fp->rate_max)
                        rmax = fp->rate_max;
            } else {
                  rmin = fp->rate_min;
                  rmax = fp->rate_max;
            }
      }

      if (!changed) {
            hwc_debug("  --> get empty\n");
            it->empty = 1;
            return -EINVAL;
      }

      changed = 0;
      if (it->min < rmin) {
            it->min = rmin;
            it->openmin = 0;
            changed = 1;
      }
      if (it->max > rmax) {
            it->max = rmax;
            it->openmax = 0;
            changed = 1;
      }
      if (snd_interval_checkempty(it)) {
            it->empty = 1;
            return -EINVAL;
      }
      hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
      return changed;
}


static int hw_rule_channels(struct snd_pcm_hw_params *params,
                      struct snd_pcm_hw_rule *rule)
{
      struct snd_usb_substream *subs = rule->private;
      struct list_head *p;
      struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
      unsigned int rmin, rmax;
      int changed;

      hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
      changed = 0;
      rmin = rmax = 0;
      list_for_each(p, &subs->fmt_list) {
            struct audioformat *fp;
            fp = list_entry(p, struct audioformat, list);
            if (!hw_check_valid_format(subs, params, fp))
                  continue;
            if (changed++) {
                  if (rmin > fp->channels)
                        rmin = fp->channels;
                  if (rmax < fp->channels)
                        rmax = fp->channels;
            } else {
                  rmin = fp->channels;
                  rmax = fp->channels;
            }
      }

      if (!changed) {
            hwc_debug("  --> get empty\n");
            it->empty = 1;
            return -EINVAL;
      }

      changed = 0;
      if (it->min < rmin) {
            it->min = rmin;
            it->openmin = 0;
            changed = 1;
      }
      if (it->max > rmax) {
            it->max = rmax;
            it->openmax = 0;
            changed = 1;
      }
      if (snd_interval_checkempty(it)) {
            it->empty = 1;
            return -EINVAL;
      }
      hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
      return changed;
}

static int hw_rule_format(struct snd_pcm_hw_params *params,
                    struct snd_pcm_hw_rule *rule)
{
      struct snd_usb_substream *subs = rule->private;
      struct list_head *p;
      struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
      u64 fbits;
      u32 oldbits[2];
      int changed;

      hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
      fbits = 0;
      list_for_each(p, &subs->fmt_list) {
            struct audioformat *fp;
            fp = list_entry(p, struct audioformat, list);
            if (!hw_check_valid_format(subs, params, fp))
                  continue;
            fbits |= fp->formats;
      }

      oldbits[0] = fmt->bits[0];
      oldbits[1] = fmt->bits[1];
      fmt->bits[0] &= (u32)fbits;
      fmt->bits[1] &= (u32)(fbits >> 32);
      if (!fmt->bits[0] && !fmt->bits[1]) {
            hwc_debug("  --> get empty\n");
            return -EINVAL;
      }
      changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
      hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
      return changed;
}

static int hw_rule_period_time(struct snd_pcm_hw_params *params,
                         struct snd_pcm_hw_rule *rule)
{
      struct snd_usb_substream *subs = rule->private;
      struct audioformat *fp;
      struct snd_interval *it;
      unsigned char min_datainterval;
      unsigned int pmin;
      int changed;

      it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
      hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
      min_datainterval = 0xff;
      list_for_each_entry(fp, &subs->fmt_list, list) {
            if (!hw_check_valid_format(subs, params, fp))
                  continue;
            min_datainterval = min(min_datainterval, fp->datainterval);
      }
      if (min_datainterval == 0xff) {
            hwc_debug("  --> get empty\n");
            it->empty = 1;
            return -EINVAL;
      }
      pmin = 125 * (1 << min_datainterval);
      changed = 0;
      if (it->min < pmin) {
            it->min = pmin;
            it->openmin = 0;
            changed = 1;
      }
      if (snd_interval_checkempty(it)) {
            it->empty = 1;
            return -EINVAL;
      }
      hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
      return changed;
}

/*
 *  If the device supports unusual bit rates, does the request meet these?
 */
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
                          struct snd_usb_substream *subs)
{
      struct audioformat *fp;
      int count = 0, needs_knot = 0;
      int err;

      list_for_each_entry(fp, &subs->fmt_list, list) {
            if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
                  return 0;
            count += fp->nr_rates;
            if (fp->rates & SNDRV_PCM_RATE_KNOT)
                  needs_knot = 1;
      }
      if (!needs_knot)
            return 0;

      subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
      if (!subs->rate_list.list)
            return -ENOMEM;
      subs->rate_list.count = count;
      subs->rate_list.mask = 0;
      count = 0;
      list_for_each_entry(fp, &subs->fmt_list, list) {
            int i;
            for (i = 0; i < fp->nr_rates; i++)
                  subs->rate_list.list[count++] = fp->rate_table[i];
      }
      err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                               &subs->rate_list);
      if (err < 0)
            return err;

      return 0;
}


/*
 * set up the runtime hardware information.
 */

static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
{
      struct list_head *p;
      unsigned int pt, ptmin;
      int param_period_time_if_needed;
      int err;

      runtime->hw.formats = subs->formats;

      runtime->hw.rate_min = 0x7fffffff;
      runtime->hw.rate_max = 0;
      runtime->hw.channels_min = 256;
      runtime->hw.channels_max = 0;
      runtime->hw.rates = 0;
      ptmin = UINT_MAX;
      /* check min/max rates and channels */
      list_for_each(p, &subs->fmt_list) {
            struct audioformat *fp;
            fp = list_entry(p, struct audioformat, list);
            runtime->hw.rates |= fp->rates;
            if (runtime->hw.rate_min > fp->rate_min)
                  runtime->hw.rate_min = fp->rate_min;
            if (runtime->hw.rate_max < fp->rate_max)
                  runtime->hw.rate_max = fp->rate_max;
            if (runtime->hw.channels_min > fp->channels)
                  runtime->hw.channels_min = fp->channels;
            if (runtime->hw.channels_max < fp->channels)
                  runtime->hw.channels_max = fp->channels;
            if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
                  /* FIXME: there might be more than one audio formats... */
                  runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
                        fp->frame_size;
            }
            pt = 125 * (1 << fp->datainterval);
            ptmin = min(ptmin, pt);
      }

      param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
      if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
            /* full speed devices have fixed data packet interval */
            ptmin = 1000;
      if (ptmin == 1000)
            /* if period time doesn't go below 1 ms, no rules needed */
            param_period_time_if_needed = -1;
      snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
                             ptmin, UINT_MAX);

      if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                               hw_rule_rate, subs,
                               SNDRV_PCM_HW_PARAM_FORMAT,
                               SNDRV_PCM_HW_PARAM_CHANNELS,
                               param_period_time_if_needed,
                               -1)) < 0)
            return err;
      if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
                               hw_rule_channels, subs,
                               SNDRV_PCM_HW_PARAM_FORMAT,
                               SNDRV_PCM_HW_PARAM_RATE,
                               param_period_time_if_needed,
                               -1)) < 0)
            return err;
      if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
                               hw_rule_format, subs,
                               SNDRV_PCM_HW_PARAM_RATE,
                               SNDRV_PCM_HW_PARAM_CHANNELS,
                               param_period_time_if_needed,
                               -1)) < 0)
            return err;
      if (param_period_time_if_needed >= 0) {
            err = snd_pcm_hw_rule_add(runtime, 0,
                                SNDRV_PCM_HW_PARAM_PERIOD_TIME,
                                hw_rule_period_time, subs,
                                SNDRV_PCM_HW_PARAM_FORMAT,
                                SNDRV_PCM_HW_PARAM_CHANNELS,
                                SNDRV_PCM_HW_PARAM_RATE,
                                -1);
            if (err < 0)
                  return err;
      }
      if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
            return err;
      return 0;
}

static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
{
      struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_usb_substream *subs = &as->substream[direction];

      subs->interface = -1;
      subs->altset_idx = 0;
      runtime->hw = snd_usb_hardware;
      runtime->private_data = subs;
      subs->pcm_substream = substream;
      return setup_hw_info(runtime, subs);
}

static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
{
      struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
      struct snd_usb_substream *subs = &as->substream[direction];

      if (!as->chip->shutdown && subs->interface >= 0) {
            usb_set_interface(subs->dev, subs->interface, 0);
            subs->interface = -1;
      }
      subs->pcm_substream = NULL;
      return 0;
}

static int snd_usb_playback_open(struct snd_pcm_substream *substream)
{
      return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_playback_close(struct snd_pcm_substream *substream)
{
      return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_capture_open(struct snd_pcm_substream *substream)
{
      return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
}

static int snd_usb_capture_close(struct snd_pcm_substream *substream)
{
      return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
}

static struct snd_pcm_ops snd_usb_playback_ops = {
      .open =           snd_usb_playback_open,
      .close =    snd_usb_playback_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_usb_hw_params,
      .hw_free =  snd_usb_hw_free,
      .prepare =  snd_usb_pcm_prepare,
      .trigger =  snd_usb_substream_playback_trigger,
      .pointer =  snd_usb_pcm_pointer,
      .page =           snd_pcm_lib_get_vmalloc_page,
      .mmap =           snd_pcm_lib_mmap_vmalloc,
};

static struct snd_pcm_ops snd_usb_capture_ops = {
      .open =           snd_usb_capture_open,
      .close =    snd_usb_capture_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_usb_hw_params,
      .hw_free =  snd_usb_hw_free,
      .prepare =  snd_usb_pcm_prepare,
      .trigger =  snd_usb_substream_capture_trigger,
      .pointer =  snd_usb_pcm_pointer,
      .page =           snd_pcm_lib_get_vmalloc_page,
      .mmap =           snd_pcm_lib_mmap_vmalloc,
};

void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
{
      snd_pcm_set_ops(pcm, stream,
                  stream == SNDRV_PCM_STREAM_PLAYBACK ?
                  &snd_usb_playback_ops : &snd_usb_capture_ops);
}

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