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pcm.c
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/*
* 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/ratelimit.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 "endpoint.h"
#include "helper.h"
#include "pcm.h"
#include "clock.h"
#include "power.h"
#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
/* return the estimated delay based on USB frame counters */
snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
unsigned int rate)
{
int current_frame_number;
int frame_diff;
int est_delay;
if (!subs->last_delay)
return 0; /* short path */
current_frame_number = usb_get_current_frame_number(subs->dev);
/*
* HCD implementations use different widths, use lower 8 bits.
* The delay will be managed up to 256ms, which is more than
* enough
*/
frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
/* Approximation based on number of samples per USB frame (ms),
some truncation for 44.1 but the estimate is good enough */
est_delay = subs->last_delay - (frame_diff * rate / 1000);
if (est_delay < 0)
est_delay = 0;
return est_delay;
}
/*
* 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;
if (subs->stream->chip->shutdown)
return SNDRV_PCM_POS_XRUN;
spin_lock(&subs->lock);
hwptr_done = subs->hwptr_done;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
substream->runtime->delay = snd_usb_pcm_delay(subs,
substream->runtime->rate);
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)
{
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 << subs->pcm_format)))
continue;
if (fp->channels != subs->channels)
continue;
if (subs->cur_rate < fp->rate_min ||
subs->cur_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] == subs->cur_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))) < 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];
int err;
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))) < 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);
}
}
static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
{
int err;
if (!subs->data_endpoint)
return -EINVAL;
if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
struct snd_usb_endpoint *ep = subs->data_endpoint;
snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
ep->data_subs = subs;
err = snd_usb_endpoint_start(ep, can_sleep);
if (err < 0) {
clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
return err;
}
}
if (subs->sync_endpoint &&
!test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
struct snd_usb_endpoint *ep = subs->sync_endpoint;
if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
err = usb_set_interface(subs->dev,
subs->sync_endpoint->iface,
subs->sync_endpoint->alt_idx);
if (err < 0) {
snd_printk(KERN_ERR
"%d:%d:%d: cannot set interface (%d)\n",
subs->dev->devnum,
subs->sync_endpoint->iface,
subs->sync_endpoint->alt_idx, err);
return -EIO;
}
}
snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
ep->sync_slave = subs->data_endpoint;
err = snd_usb_endpoint_start(ep, can_sleep);
if (err < 0) {
clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
return err;
}
}
return 0;
}
static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
{
if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
snd_usb_endpoint_stop(subs->sync_endpoint);
if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
snd_usb_endpoint_stop(subs->data_endpoint);
if (wait) {
snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
}
}
static int deactivate_endpoints(struct snd_usb_substream *subs)
{
int reta, retb;
reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
if (reta < 0)
return reta;
if (retb < 0)
return retb;
return 0;
}
/*
* 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, implicit_fb = 0;
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) {
err = usb_set_interface(subs->dev, subs->interface, 0);
if (err < 0) {
snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
dev->devnum, fmt->iface, fmt->altsetting, err);
return -EIO;
}
subs->interface = -1;
subs->altset_idx = 0;
}
/* set interface */
if (subs->interface != fmt->iface ||
subs->altset_idx != fmt->altset_idx) {
err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
if (err < 0) {
snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
dev->devnum, fmt->iface, fmt->altsetting, err);
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;
}
subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
alts, fmt->endpoint, subs->direction,
SND_USB_ENDPOINT_TYPE_DATA);
if (!subs->data_endpoint)
return -EINVAL;
/* 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;
switch (subs->stream->chip->usb_id) {
case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
if (is_playback) {
implicit_fb = 1;
ep = 0x81;
iface = usb_ifnum_to_if(dev, 3);
if (!iface || iface->num_altsetting == 0)
return -EINVAL;
alts = &iface->altsetting[1];
goto add_sync_ep;
}
break;
case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
case USB_ID(0x0763, 0x2081):
if (is_playback) {
implicit_fb = 1;
ep = 0x81;
iface = usb_ifnum_to_if(dev, 2);
if (!iface || iface->num_altsetting == 0)
return -EINVAL;
alts = &iface->altsetting[1];
goto add_sync_ep;
}
}
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) != USB_ENDPOINT_XFER_ISOC ||
(get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
get_endpoint(alts, 1)->bSynchAddress != 0 &&
!implicit_fb)) {
snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
dev->devnum, fmt->iface, fmt->altsetting,
get_endpoint(alts, 1)->bmAttributes,
get_endpoint(alts, 1)->bLength,
get_endpoint(alts, 1)->bSynchAddress);
return -EINVAL;
}
ep = get_endpoint(alts, 1)->bEndpointAddress;
if (!implicit_fb &&
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 sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
dev->devnum, fmt->iface, fmt->altsetting,
is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
return -EINVAL;
}
implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
== USB_ENDPOINT_USAGE_IMPLICIT_FB;
add_sync_ep:
subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
alts, ep, !subs->direction,
implicit_fb ?
SND_USB_ENDPOINT_TYPE_DATA :
SND_USB_ENDPOINT_TYPE_SYNC);
if (!subs->sync_endpoint)
return -EINVAL;
subs->data_endpoint->sync_master = subs->sync_endpoint;
}
if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, 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;
}
/*
* Return the score of matching two audioformats.
* Veto the audioformat if:
* - It has no channels for some reason.
* - Requested PCM format is not supported.
* - Requested sample rate is not supported.
*/
static int match_endpoint_audioformats(struct audioformat *fp,
struct audioformat *match, int rate,
snd_pcm_format_t pcm_format)
{
int i;
int score = 0;
if (fp->channels < 1) {
snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp);
return 0;
}
if (!(fp->formats & (1ULL << pcm_format))) {
snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__,
fp, pcm_format);
return 0;
}
for (i = 0; i < fp->nr_rates; i++) {
if (fp->rate_table[i] == rate) {
score++;
break;
}
}
if (!score) {
snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__,
fp, rate);
return 0;
}
if (fp->channels == match->channels)
score++;
snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score);
return score;
}
/*
* Configure the sync ep using the rate and pcm format of the data ep.
*/
static int configure_sync_endpoint(struct snd_usb_substream *subs)
{
int ret;
struct audioformat *fp;
struct audioformat *sync_fp = NULL;
int cur_score = 0;
int sync_period_bytes = subs->period_bytes;
struct snd_usb_substream *sync_subs =
&subs->stream->substream[subs->direction ^ 1];
/* Try to find the best matching audioformat. */
list_for_each_entry(fp, &sync_subs->fmt_list, list) {
int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
subs->cur_rate, subs->pcm_format);
if (score > cur_score) {
sync_fp = fp;
cur_score = score;
}
}
if (unlikely(sync_fp == NULL)) {
snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
__func__, sync_subs->ep_num);
return -EINVAL;
}
/*
* Recalculate the period bytes if channel number differ between
* data and sync ep audioformat.
*/
if (sync_fp->channels != subs->channels) {
sync_period_bytes = (subs->period_bytes / subs->channels) *
sync_fp->channels;
snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
__func__, subs->period_bytes, sync_period_bytes);
}
ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
subs->pcm_format,
sync_fp->channels,
sync_period_bytes,
subs->cur_rate,
sync_fp,
NULL);
return ret;
}
/*
* configure endpoint params
*
* called during initial setup and upon resume
*/
static int configure_endpoint(struct snd_usb_substream *subs)
{
int ret;
/* format changed */
stop_endpoints(subs, true);
ret = snd_usb_endpoint_set_params(subs->data_endpoint,
subs->pcm_format,
subs->channels,
subs->period_bytes,
subs->cur_rate,
subs->cur_audiofmt,
subs->sync_endpoint);
if (ret < 0)
return ret;
if (subs->sync_endpoint)
ret = configure_sync_endpoint(subs);
return ret;
}
/*
* 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;
int ret;
ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
if (ret < 0)
return ret;
subs->pcm_format = params_format(hw_params);
subs->period_bytes = params_period_bytes(hw_params);
subs->channels = params_channels(hw_params);
subs->cur_rate = params_rate(hw_params);
fmt = find_format(subs);
if (!fmt) {
snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
subs->pcm_format, subs->cur_rate, subs->channels);
return -EINVAL;
}
down_read(&subs->stream->chip->shutdown_rwsem);
if (subs->stream->chip->shutdown)
ret = -ENODEV;
else
ret = set_format(subs, fmt);
up_read(&subs->stream->chip->shutdown_rwsem);
if (ret < 0)
return ret;
subs->interface = fmt->iface;
subs->altset_idx = fmt->altset_idx;
subs->need_setup_ep = true;
return 0;
}
/*
* 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;
down_read(&subs->stream->chip->shutdown_rwsem);
if (!subs->stream->chip->shutdown) {
stop_endpoints(subs, true);
deactivate_endpoints(subs);
}
up_read(&subs->stream->chip->shutdown_rwsem);
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;
struct usb_host_interface *alts;
struct usb_interface *iface;
int ret;
if (! subs->cur_audiofmt) {
snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
return -ENXIO;
}
down_read(&subs->stream->chip->shutdown_rwsem);
if (subs->stream->chip->shutdown) {
ret = -ENODEV;
goto unlock;
}
if (snd_BUG_ON(!subs->data_endpoint)) {
ret = -EIO;
goto unlock;
}
snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
ret = set_format(subs, subs->cur_audiofmt);
if (ret < 0)
goto unlock;
iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
ret = snd_usb_init_sample_rate(subs->stream->chip,
subs->cur_audiofmt->iface,
alts,
subs->cur_audiofmt,
subs->cur_rate);
if (ret < 0)
goto unlock;
if (subs->need_setup_ep) {
ret = configure_endpoint(subs);
if (ret < 0)
goto unlock;
subs->need_setup_ep = false;
}
/* some unit conversions in runtime */
subs->data_endpoint->maxframesize =
bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
subs->data_endpoint->curframesize =
bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
/* reset the pointer */
subs->hwptr_done = 0;
subs->transfer_done = 0;
subs->last_delay = 0;
subs->last_frame_number = 0;
runtime->delay = 0;
/* for playback, submit the URBs now; otherwise, the first hwptr_done
* updates for all URBs would happen at the same time when starting */
if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
ret = start_endpoints(subs, true);
unlock:
up_read(&subs->stream->chip->shutdown_rwsem);
return ret;
}
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 (subs->speed != 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 *rate_list;
int count = 0, needs_knot = 0;
int err;
kfree(subs->rate_list.list);
subs->rate_list.list = NULL;
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 = rate_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++)
rate_list[count++] = fp->rate_table[i];
}
err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,