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pcm.c
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pcm.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/bitrev.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 "endpoint.h"
#include "helper.h"
#include "pcm.h"
#include "clock.h"
#include "power.h"
#include "media.h"
#include "implicit.h"
#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
/* return the estimated delay based on USB frame counters */
static snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
struct snd_pcm_runtime *runtime)
{
unsigned int current_frame_number;
unsigned int frame_diff;
int est_delay;
int queued;
if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
queued = bytes_to_frames(runtime, subs->inflight_bytes);
if (!queued)
return 0;
} else if (!subs->running) {
return 0;
}
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 = frame_diff * runtime->rate / 1000;
if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
est_delay = queued - est_delay;
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_pcm_runtime *runtime = substream->runtime;
struct snd_usb_substream *subs = runtime->private_data;
unsigned int hwptr_done;
if (atomic_read(&subs->stream->chip->shutdown))
return SNDRV_PCM_POS_XRUN;
spin_lock(&subs->lock);
hwptr_done = subs->hwptr_done;
runtime->delay = snd_usb_pcm_delay(subs, runtime);
spin_unlock(&subs->lock);
return bytes_to_frames(runtime, hwptr_done);
}
/*
* find a matching audio format
*/
static const struct audioformat *
find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
unsigned int rate, unsigned int channels, bool strict_match,
struct snd_usb_substream *subs)
{
const struct audioformat *fp;
const struct audioformat *found = NULL;
int cur_attr = 0, attr;
list_for_each_entry(fp, fmt_list_head, list) {
if (strict_match) {
if (!(fp->formats & pcm_format_to_bits(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 (subs && 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 const struct audioformat *
find_substream_format(struct snd_usb_substream *subs,
const struct snd_pcm_hw_params *params)
{
return find_format(&subs->fmt_list, params_format(params),
params_rate(params), params_channels(params),
true, subs);
}
bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *subs)
{
const struct audioformat *fp;
struct snd_usb_audio *chip;
int rate = -1;
if (!subs)
return false;
chip = subs->stream->chip;
if (!(chip->quirk_flags & QUIRK_FLAG_FIXED_RATE))
return false;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
return false;
if (fp->nr_rates < 1)
continue;
if (fp->nr_rates > 1)
return false;
if (rate < 0) {
rate = fp->rate_table[0];
continue;
}
if (rate != fp->rate_table[0])
return false;
}
return true;
}
static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
{
struct usb_device *dev = chip->dev;
unsigned char data[1];
int err;
data[0] = 1;
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));
return err;
}
static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
{
struct usb_device *dev = chip->dev;
unsigned char data[1];
int err;
data[0] = 1;
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));
return err;
}
/*
* initialize the pitch control and sample rate
*/
int snd_usb_init_pitch(struct snd_usb_audio *chip,
const struct audioformat *fmt)
{
int err;
/* if endpoint doesn't have pitch control, bail out */
if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
return 0;
usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
switch (fmt->protocol) {
case UAC_VERSION_1:
err = init_pitch_v1(chip, fmt->endpoint);
break;
case UAC_VERSION_2:
err = init_pitch_v2(chip, fmt->endpoint);
break;
default:
return 0;
}
if (err < 0) {
usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
fmt->endpoint);
return err;
}
return 0;
}
static bool stop_endpoints(struct snd_usb_substream *subs, bool keep_pending)
{
bool stopped = 0;
if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
snd_usb_endpoint_stop(subs->sync_endpoint, keep_pending);
stopped = true;
}
if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
snd_usb_endpoint_stop(subs->data_endpoint, keep_pending);
stopped = true;
}
return stopped;
}
static int start_endpoints(struct snd_usb_substream *subs)
{
int err;
if (!subs->data_endpoint)
return -EINVAL;
if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
err = snd_usb_endpoint_start(subs->data_endpoint);
if (err < 0) {
clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
goto error;
}
}
if (subs->sync_endpoint &&
!test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
err = snd_usb_endpoint_start(subs->sync_endpoint);
if (err < 0) {
clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
goto error;
}
}
return 0;
error:
stop_endpoints(subs, false);
return err;
}
static void sync_pending_stops(struct snd_usb_substream *subs)
{
snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
}
/* PCM sync_stop callback */
static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
sync_pending_stops(subs);
return 0;
}
/* Set up sync endpoint */
int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
struct audioformat *fmt)
{
struct usb_device *dev = chip->dev;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
unsigned int ep, attr, sync_attr;
bool is_playback;
int err;
if (fmt->sync_ep)
return 0; /* already set up */
alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
if (!alts)
return 0;
altsd = get_iface_desc(alts);
err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
if (err > 0)
return 0; /* matched */
/*
* Generic sync EP handling
*/
if (fmt->ep_idx > 0 || altsd->bNumEndpoints < 2)
return 0;
is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
(!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
return 0;
sync_attr = get_endpoint(alts, 1)->bmAttributes;
/*
* In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
* if we don't find a sync endpoint, as on M-Audio Transit. In case of
* error fall back to SYNC mode and don't create sync endpoint
*/
/* 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 ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
(get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
get_endpoint(alts, 1)->bSynchAddress != 0)) {
dev_err(&dev->dev,
"%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
fmt->iface, fmt->altsetting,
get_endpoint(alts, 1)->bmAttributes,
get_endpoint(alts, 1)->bLength,
get_endpoint(alts, 1)->bSynchAddress);
if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
return 0;
return -EINVAL;
}
ep = get_endpoint(alts, 1)->bEndpointAddress;
if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
get_endpoint(alts, 0)->bSynchAddress != 0 &&
((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)))) {
dev_err(&dev->dev,
"%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
fmt->iface, fmt->altsetting,
is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
return 0;
return -EINVAL;
}
fmt->sync_ep = ep;
fmt->sync_iface = altsd->bInterfaceNumber;
fmt->sync_altsetting = altsd->bAlternateSetting;
fmt->sync_ep_idx = 1;
if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
fmt->implicit_fb = 1;
dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
fmt->sync_altsetting, fmt->implicit_fb);
return 0;
}
static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
{
int ret;
if (!subs->str_pd)
return 0;
ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
if (ret < 0) {
dev_err(&subs->dev->dev,
"Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
subs->str_pd->pd_id, state, ret);
return ret;
}
return 0;
}
int snd_usb_pcm_suspend(struct snd_usb_stream *as)
{
int ret;
ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
if (ret < 0)
return ret;
ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
if (ret < 0)
return ret;
return 0;
}
int snd_usb_pcm_resume(struct snd_usb_stream *as)
{
int ret;
ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
if (ret < 0)
return ret;
ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
if (ret < 0)
return ret;
return 0;
}
static void close_endpoints(struct snd_usb_audio *chip,
struct snd_usb_substream *subs)
{
if (subs->data_endpoint) {
snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
snd_usb_endpoint_close(chip, subs->data_endpoint);
subs->data_endpoint = NULL;
}
if (subs->sync_endpoint) {
snd_usb_endpoint_close(chip, subs->sync_endpoint);
subs->sync_endpoint = NULL;
}
}
/*
* 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 snd_usb_audio *chip = subs->stream->chip;
const struct audioformat *fmt;
const struct audioformat *sync_fmt;
bool fixed_rate, sync_fixed_rate;
int ret;
ret = snd_media_start_pipeline(subs);
if (ret)
return ret;
fixed_rate = snd_usb_pcm_has_fixed_rate(subs);
fmt = find_substream_format(subs, hw_params);
if (!fmt) {
usb_audio_dbg(chip,
"cannot find format: format=%s, rate=%d, channels=%d\n",
snd_pcm_format_name(params_format(hw_params)),
params_rate(hw_params), params_channels(hw_params));
ret = -EINVAL;
goto stop_pipeline;
}
if (fmt->implicit_fb) {
sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
hw_params,
!substream->stream,
&sync_fixed_rate);
if (!sync_fmt) {
usb_audio_dbg(chip,
"cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
fmt->sync_ep, fmt->sync_iface,
fmt->sync_altsetting,
snd_pcm_format_name(params_format(hw_params)),
params_rate(hw_params), params_channels(hw_params));
ret = -EINVAL;
goto stop_pipeline;
}
} else {
sync_fmt = fmt;
sync_fixed_rate = fixed_rate;
}
ret = snd_usb_lock_shutdown(chip);
if (ret < 0)
goto stop_pipeline;
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
if (ret < 0)
goto unlock;
if (subs->data_endpoint) {
if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
fmt, hw_params))
goto unlock;
if (stop_endpoints(subs, false))
sync_pending_stops(subs);
close_endpoints(chip, subs);
}
subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false, fixed_rate);
if (!subs->data_endpoint) {
ret = -EINVAL;
goto unlock;
}
if (fmt->sync_ep) {
subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
hw_params,
fmt == sync_fmt,
sync_fixed_rate);
if (!subs->sync_endpoint) {
ret = -EINVAL;
goto unlock;
}
snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
subs->sync_endpoint);
}
mutex_lock(&chip->mutex);
subs->cur_audiofmt = fmt;
mutex_unlock(&chip->mutex);
if (!subs->data_endpoint->need_setup)
goto unlock;
if (subs->sync_endpoint) {
ret = snd_usb_endpoint_set_params(chip, subs->sync_endpoint);
if (ret < 0)
goto unlock;
}
ret = snd_usb_endpoint_set_params(chip, subs->data_endpoint);
unlock:
if (ret < 0)
close_endpoints(chip, subs);
snd_usb_unlock_shutdown(chip);
stop_pipeline:
if (ret < 0)
snd_media_stop_pipeline(subs);
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;
struct snd_usb_audio *chip = subs->stream->chip;
snd_media_stop_pipeline(subs);
mutex_lock(&chip->mutex);
subs->cur_audiofmt = NULL;
mutex_unlock(&chip->mutex);
if (!snd_usb_lock_shutdown(chip)) {
if (stop_endpoints(subs, false))
sync_pending_stops(subs);
close_endpoints(chip, subs);
snd_usb_unlock_shutdown(chip);
}
return 0;
}
/* free-wheeling mode? (e.g. dmix) */
static int in_free_wheeling_mode(struct snd_pcm_runtime *runtime)
{
return runtime->stop_threshold > runtime->buffer_size;
}
/* check whether early start is needed for playback stream */
static int lowlatency_playback_available(struct snd_pcm_runtime *runtime,
struct snd_usb_substream *subs)
{
struct snd_usb_audio *chip = subs->stream->chip;
if (subs->direction == SNDRV_PCM_STREAM_CAPTURE)
return false;
/* disabled via module option? */
if (!chip->lowlatency)
return false;
if (in_free_wheeling_mode(runtime))
return false;
/* implicit feedback mode has own operation mode */
if (snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint))
return false;
return true;
}
/*
* 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 snd_usb_audio *chip = subs->stream->chip;
int retry = 0;
int ret;
ret = snd_usb_lock_shutdown(chip);
if (ret < 0)
return ret;
if (snd_BUG_ON(!subs->data_endpoint)) {
ret = -EIO;
goto unlock;
}
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
if (ret < 0)
goto unlock;
again:
if (subs->sync_endpoint) {
ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
if (ret < 0)
goto unlock;
}
ret = snd_usb_endpoint_prepare(chip, subs->data_endpoint);
if (ret < 0)
goto unlock;
else if (ret > 0)
snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
ret = 0;
/* reset the pointer */
subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
subs->inflight_bytes = 0;
subs->hwptr_done = 0;
subs->transfer_done = 0;
subs->last_frame_number = 0;
subs->period_elapsed_pending = 0;
runtime->delay = 0;
subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
!subs->lowlatency_playback) {
ret = start_endpoints(subs);
/* if XRUN happens at starting streams (possibly with implicit
* fb case), restart again, but only try once.
*/
if (ret == -EPIPE && !retry++) {
sync_pending_stops(subs);
goto again;
}
}
unlock:
snd_usb_unlock_shutdown(chip);
return ret;
}
/*
* h/w constraints
*/
#ifdef HW_CONST_DEBUG
#define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
#else
#define hwc_debug(fmt, args...) do { } while(0)
#endif
static const 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,
.channels_min = 1,
.channels_max = 256,
.buffer_bytes_max = INT_MAX, /* limited by BUFFER_TIME later */
.period_bytes_min = 64,
.period_bytes_max = INT_MAX, /* limited by PERIOD_TIME later */
.periods_min = 2,
.periods_max = 1024,
};
static int hw_check_valid_format(struct snd_usb_substream *subs,
struct snd_pcm_hw_params *params,
const 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 0x%llx\n", fp->formats);
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 apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
unsigned int rmax)
{
int changed;
if (rmin > rmax) {
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;
}
/* get the specified endpoint object that is being used by other streams
* (i.e. the parameter is locked)
*/
static const struct snd_usb_endpoint *
get_endpoint_in_use(struct snd_usb_audio *chip, int endpoint,
const struct snd_usb_endpoint *ref_ep)
{
const struct snd_usb_endpoint *ep;
ep = snd_usb_get_endpoint(chip, endpoint);
if (ep && ep->cur_audiofmt && (ep != ref_ep || ep->opened > 1))
return ep;
return NULL;
}
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 snd_usb_audio *chip = subs->stream->chip;
const struct snd_usb_endpoint *ep;
const struct audioformat *fp;
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
unsigned int rmin, rmax, r;
int i;
hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
rmin = UINT_MAX;
rmax = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (!hw_check_valid_format(subs, params, fp))
continue;
ep = get_endpoint_in_use(chip, fp->endpoint,
subs->data_endpoint);
if (ep) {
hwc_debug("rate limit %d for ep#%x\n",
ep->cur_rate, fp->endpoint);
rmin = min(rmin, ep->cur_rate);
rmax = max(rmax, ep->cur_rate);
continue;
}
if (fp->implicit_fb) {
ep = get_endpoint_in_use(chip, fp->sync_ep,
subs->sync_endpoint);
if (ep) {
hwc_debug("rate limit %d for sync_ep#%x\n",
ep->cur_rate, fp->sync_ep);
rmin = min(rmin, ep->cur_rate);
rmax = max(rmax, ep->cur_rate);
continue;
}
}
r = snd_usb_endpoint_get_clock_rate(chip, fp->clock);
if (r > 0) {
if (!snd_interval_test(it, r))
continue;
rmin = min(rmin, r);
rmax = max(rmax, r);
continue;
}
if (fp->rate_table && fp->nr_rates) {
for (i = 0; i < fp->nr_rates; i++) {
r = fp->rate_table[i];
if (!snd_interval_test(it, r))
continue;
rmin = min(rmin, r);
rmax = max(rmax, r);
}
} else {
rmin = min(rmin, fp->rate_min);
rmax = max(rmax, fp->rate_max);
}
}
return apply_hw_params_minmax(it, rmin, rmax);
}
static int hw_rule_channels(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
const struct audioformat *fp;
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
unsigned int rmin, rmax;
hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
rmin = UINT_MAX;
rmax = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (!hw_check_valid_format(subs, params, fp))
continue;
rmin = min(rmin, fp->channels);
rmax = max(rmax, fp->channels);
}
return apply_hw_params_minmax(it, rmin, rmax);
}
static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits)
{
u32 oldbits[2];
int changed;
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_format(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
struct snd_usb_audio *chip = subs->stream->chip;
const struct snd_usb_endpoint *ep;
const struct audioformat *fp;
struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
u64 fbits;
hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
fbits = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (!hw_check_valid_format(subs, params, fp))
continue;
ep = get_endpoint_in_use(chip, fp->endpoint,
subs->data_endpoint);
if (ep) {
hwc_debug("format limit %d for ep#%x\n",
ep->cur_format, fp->endpoint);
fbits |= pcm_format_to_bits(ep->cur_format);
continue;
}
if (fp->implicit_fb) {
ep = get_endpoint_in_use(chip, fp->sync_ep,
subs->sync_endpoint);
if (ep) {
hwc_debug("format limit %d for sync_ep#%x\n",
ep->cur_format, fp->sync_ep);
fbits |= pcm_format_to_bits(ep->cur_format);
continue;
}
}
fbits |= fp->formats;
}
return apply_hw_params_format_bits(fmt, fbits);
}
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;
const struct audioformat *fp;
struct snd_interval *it;
unsigned char min_datainterval;
unsigned int pmin;
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);
return apply_hw_params_minmax(it, pmin, UINT_MAX);
}
/* additional hw constraints for implicit feedback mode */
static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
struct snd_usb_audio *chip = subs->stream->chip;
const struct audioformat *fp;
const struct snd_usb_endpoint *ep;
struct snd_interval *it;
unsigned int rmin, rmax;
it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
hwc_debug("hw_rule_period_size: (%u,%u)\n", it->min, it->max);
rmin = UINT_MAX;