linux-stable/sound/usb/pcm.c
Craig McLure 0e85a22d01 ALSA: usb-audio: Configure sync endpoints before data
Devices such as the TC-Helicon GoXLR require the sync endpoint to be
configured in advance of the data endpoint in order for sound output
to work.

This patch simply changes the ordering of EP configuration to resolve
this.

Fixes: bf6313a0ff ("ALSA: usb-audio: Refactor endpoint management")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=215079
Signed-off-by: Craig McLure <craig@mclure.net>
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220524062115.25968-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-05-24 09:08:39 +02:00

1701 lines
46 KiB
C

// 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);
}
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;
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 (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;
}
}
static int configure_endpoints(struct snd_usb_audio *chip,
struct snd_usb_substream *subs)
{
int err;
if (subs->data_endpoint->need_setup) {
/* stop any running stream beforehand */
if (stop_endpoints(subs, false))
sync_pending_stops(subs);
if (subs->sync_endpoint) {
err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
if (err < 0)
return err;
}
err = snd_usb_endpoint_configure(chip, subs->data_endpoint);
if (err < 0)
return err;
snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
} else {
if (subs->sync_endpoint) {
err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
if (err < 0)
return err;
}
}
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 snd_usb_audio *chip = subs->stream->chip;
const struct audioformat *fmt;
const struct audioformat *sync_fmt;
int ret;
ret = snd_media_start_pipeline(subs);
if (ret)
return ret;
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);
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;
}
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;
close_endpoints(chip, subs);
}
subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false);
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);
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);
ret = configure_endpoints(chip, subs);
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 ret;
ret = snd_usb_lock_shutdown(chip);
if (ret < 0)
return ret;
if (snd_BUG_ON(!subs->data_endpoint)) {
ret = -EIO;
goto unlock;
}
ret = configure_endpoints(chip, subs);
if (ret < 0)
goto unlock;
/* 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);
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;
}
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 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;
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;
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;
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);
}
/* get the EP or the sync EP for implicit fb when it's already set up */
static const struct snd_usb_endpoint *
get_sync_ep_from_substream(struct snd_usb_substream *subs)
{
struct snd_usb_audio *chip = subs->stream->chip;
const struct audioformat *fp;
const struct snd_usb_endpoint *ep;
list_for_each_entry(fp, &subs->fmt_list, list) {
ep = snd_usb_get_endpoint(chip, fp->endpoint);
if (ep && ep->cur_audiofmt) {
/* if EP is already opened solely for this substream,
* we still allow us to change the parameter; otherwise
* this substream has to follow the existing parameter
*/
if (ep->cur_audiofmt != subs->cur_audiofmt || ep->opened > 1)
return ep;
}
if (!fp->implicit_fb)
continue;
/* for the implicit fb, check the sync ep as well */
ep = snd_usb_get_endpoint(chip, fp->sync_ep);
if (ep && ep->cur_audiofmt)
return ep;
}
return NULL;
}
/* additional hw constraints for implicit feedback mode */
static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
const struct snd_usb_endpoint *ep;
struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
ep = get_sync_ep_from_substream(subs);
if (!ep)
return 0;
hwc_debug("applying %s\n", __func__);
return apply_hw_params_format_bits(fmt, pcm_format_to_bits(ep->cur_format));
}
static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
const struct snd_usb_endpoint *ep;
struct snd_interval *it;
ep = get_sync_ep_from_substream(subs);
if (!ep)
return 0;
hwc_debug("applying %s\n", __func__);
it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
return apply_hw_params_minmax(it, ep->cur_rate, ep->cur_rate);
}
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;
const struct snd_usb_endpoint *ep;
struct snd_interval *it;
ep = get_sync_ep_from_substream(subs);
if (!ep)
return 0;
hwc_debug("applying %s\n", __func__);
it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
return apply_hw_params_minmax(it, ep->cur_period_frames,
ep->cur_period_frames);
}
static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
const struct snd_usb_endpoint *ep;
struct snd_interval *it;
ep = get_sync_ep_from_substream(subs);
if (!ep)
return 0;
hwc_debug("applying %s\n", __func__);
it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS);
return apply_hw_params_minmax(it, ep->cur_buffer_periods,
ep->cur_buffer_periods);
}
/*
* set up the runtime hardware information.
*/
static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
{
const struct audioformat *fp;
unsigned int pt, ptmin;
int param_period_time_if_needed = -1;
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_entry(fp, &subs->fmt_list, 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 (subs->speed == 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;
err = snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
ptmin, UINT_MAX);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
hw_rule_rate, subs,
SNDRV_PCM_HW_PARAM_RATE,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_CHANNELS,
param_period_time_if_needed,
-1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
hw_rule_channels, subs,
SNDRV_PCM_HW_PARAM_CHANNELS,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_RATE,
param_period_time_if_needed,
-1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
hw_rule_format, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_RATE,
SNDRV_PCM_HW_PARAM_CHANNELS,
param_period_time_if_needed,
-1);
if (err < 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;
}
/* set max period and buffer sizes for 1 and 2 seconds, respectively */
err = snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
0, 1000000);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_BUFFER_TIME,
0, 2000000);
if (err < 0)
return err;
/* additional hw constraints for implicit fb */
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
hw_rule_format_implicit_fb, subs,
SNDRV_PCM_HW_PARAM_FORMAT, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
hw_rule_rate_implicit_fb, subs,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
hw_rule_period_size_implicit_fb, subs,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
hw_rule_periods_implicit_fb, subs,
SNDRV_PCM_HW_PARAM_PERIODS, -1);
if (err < 0)
return err;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (fp->implicit_fb) {
runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
break;
}
}
return 0;
}
static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
{
int direction = substream->stream;
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];
int ret;
runtime->hw = snd_usb_hardware;
/* need an explicit sync to catch applptr update in low-latency mode */
if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
as->chip->lowlatency)
runtime->hw.info |= SNDRV_PCM_INFO_SYNC_APPLPTR;
runtime->private_data = subs;
subs->pcm_substream = substream;
/* runtime PM is also done there */
/* initialize DSD/DOP context */
subs->dsd_dop.byte_idx = 0;
subs->dsd_dop.channel = 0;
subs->dsd_dop.marker = 1;
ret = setup_hw_info(runtime, subs);
if (ret < 0)
return ret;
ret = snd_usb_autoresume(subs->stream->chip);
if (ret < 0)
return ret;
ret = snd_media_stream_init(subs, as->pcm, direction);
if (ret < 0)
snd_usb_autosuspend(subs->stream->chip);
return ret;
}
static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
{
int direction = substream->stream;
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
struct snd_usb_substream *subs = &as->substream[direction];
int ret;
snd_media_stop_pipeline(subs);
if (!snd_usb_lock_shutdown(subs->stream->chip)) {
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
snd_usb_unlock_shutdown(subs->stream->chip);
if (ret < 0)
return ret;
}
subs->pcm_substream = NULL;
snd_usb_autosuspend(subs->stream->chip);
return 0;
}
/* Since a URB can handle only a single linear buffer, we must use double
* buffering when the data to be transferred overflows the buffer boundary.
* To avoid inconsistencies when updating hwptr_done, we use double buffering
* for all URBs.
*/
static void retire_capture_urb(struct snd_usb_substream *subs,
struct urb *urb)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
unsigned int stride, frames, bytes, oldptr;
int i, period_elapsed = 0;
unsigned long flags;
unsigned char *cp;
int current_frame_number;
/* read frame number here, update pointer in critical section */
current_frame_number = usb_get_current_frame_number(subs->dev);
stride = runtime->frame_bits >> 3;
for (i = 0; i < urb->number_of_packets; i++) {
cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
i, urb->iso_frame_desc[i].status);
// continue;
}
bytes = urb->iso_frame_desc[i].actual_length;
if (subs->stream_offset_adj > 0) {
unsigned int adj = min(subs->stream_offset_adj, bytes);
cp += adj;
bytes -= adj;
subs->stream_offset_adj -= adj;
}
frames = bytes / stride;
if (!subs->txfr_quirk)
bytes = frames * stride;
if (bytes % (runtime->sample_bits >> 3) != 0) {
int oldbytes = bytes;
bytes = frames * stride;
dev_warn_ratelimited(&subs->dev->dev,
"Corrected urb data len. %d->%d\n",
oldbytes, bytes);
}
/* update the current pointer */
spin_lock_irqsave(&subs->lock, flags);
oldptr = subs->hwptr_done;
subs->hwptr_done += bytes;
if (subs->hwptr_done >= subs->buffer_bytes)
subs->hwptr_done -= subs->buffer_bytes;
frames = (bytes + (oldptr % stride)) / stride;
subs->transfer_done += frames;
if (subs->transfer_done >= runtime->period_size) {
subs->transfer_done -= runtime->period_size;
period_elapsed = 1;
}
/* realign last_frame_number */
subs->last_frame_number = current_frame_number;
spin_unlock_irqrestore(&subs->lock, flags);
/* copy a data chunk */
if (oldptr + bytes > subs->buffer_bytes) {
unsigned int bytes1 = subs->buffer_bytes - oldptr;
memcpy(runtime->dma_area + oldptr, cp, bytes1);
memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
} else {
memcpy(runtime->dma_area + oldptr, cp, bytes);
}
}
if (period_elapsed)
snd_pcm_period_elapsed(subs->pcm_substream);
}
static void urb_ctx_queue_advance(struct snd_usb_substream *subs,
struct urb *urb, unsigned int bytes)
{
struct snd_urb_ctx *ctx = urb->context;
ctx->queued += bytes;
subs->inflight_bytes += bytes;
subs->hwptr_done += bytes;
if (subs->hwptr_done >= subs->buffer_bytes)
subs->hwptr_done -= subs->buffer_bytes;
}
static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
struct urb *urb, unsigned int bytes)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
unsigned int dst_idx = 0;
unsigned int src_idx = subs->hwptr_done;
unsigned int wrap = subs->buffer_bytes;
u8 *dst = urb->transfer_buffer;
u8 *src = runtime->dma_area;
u8 marker[] = { 0x05, 0xfa };
unsigned int queued = 0;
/*
* The DSP DOP format defines a way to transport DSD samples over
* normal PCM data endpoints. It requires stuffing of marker bytes
* (0x05 and 0xfa, alternating per sample frame), and then expects
* 2 additional bytes of actual payload. The whole frame is stored
* LSB.
*
* Hence, for a stereo transport, the buffer layout looks like this,
* where L refers to left channel samples and R to right.
*
* L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
* L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
* .....
*
*/
while (bytes--) {
if (++subs->dsd_dop.byte_idx == 3) {
/* frame boundary? */
dst[dst_idx++] = marker[subs->dsd_dop.marker];
src_idx += 2;
subs->dsd_dop.byte_idx = 0;
if (++subs->dsd_dop.channel % runtime->channels == 0) {
/* alternate the marker */
subs->dsd_dop.marker++;
subs->dsd_dop.marker %= ARRAY_SIZE(marker);
subs->dsd_dop.channel = 0;
}
} else {
/* stuff the DSD payload */
int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
if (subs->cur_audiofmt->dsd_bitrev)
dst[dst_idx++] = bitrev8(src[idx]);
else
dst[dst_idx++] = src[idx];
queued++;
}
}
urb_ctx_queue_advance(subs, urb, queued);
}
/* copy bit-reversed bytes onto transfer buffer */
static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs,
struct urb *urb, unsigned int bytes)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
const u8 *src = runtime->dma_area;
u8 *buf = urb->transfer_buffer;
int i, ofs = subs->hwptr_done;
for (i = 0; i < bytes; i++) {
*buf++ = bitrev8(src[ofs]);
if (++ofs >= subs->buffer_bytes)
ofs = 0;
}
urb_ctx_queue_advance(subs, urb, bytes);
}
static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
int offset, int stride, unsigned int bytes)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
if (subs->hwptr_done + bytes > subs->buffer_bytes) {
/* err, the transferred area goes over buffer boundary. */
unsigned int bytes1 = subs->buffer_bytes - subs->hwptr_done;
memcpy(urb->transfer_buffer + offset,
runtime->dma_area + subs->hwptr_done, bytes1);
memcpy(urb->transfer_buffer + offset + bytes1,
runtime->dma_area, bytes - bytes1);
} else {
memcpy(urb->transfer_buffer + offset,
runtime->dma_area + subs->hwptr_done, bytes);
}
urb_ctx_queue_advance(subs, urb, bytes);
}
static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
struct urb *urb, int stride,
unsigned int bytes)
{
__le32 packet_length;
int i;
/* Put __le32 length descriptor at start of each packet. */
for (i = 0; i < urb->number_of_packets; i++) {
unsigned int length = urb->iso_frame_desc[i].length;
unsigned int offset = urb->iso_frame_desc[i].offset;
packet_length = cpu_to_le32(length);
offset += i * sizeof(packet_length);
urb->iso_frame_desc[i].offset = offset;
urb->iso_frame_desc[i].length += sizeof(packet_length);
memcpy(urb->transfer_buffer + offset,
&packet_length, sizeof(packet_length));
copy_to_urb(subs, urb, offset + sizeof(packet_length),
stride, length);
}
/* Adjust transfer size accordingly. */
bytes += urb->number_of_packets * sizeof(packet_length);
return bytes;
}
static int prepare_playback_urb(struct snd_usb_substream *subs,
struct urb *urb,
bool in_stream_lock)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
struct snd_usb_endpoint *ep = subs->data_endpoint;
struct snd_urb_ctx *ctx = urb->context;
unsigned int frames, bytes;
int counts;
unsigned int transfer_done, frame_limit, avail = 0;
int i, stride, period_elapsed = 0;
unsigned long flags;
int err = 0;
stride = ep->stride;
frames = 0;
ctx->queued = 0;
urb->number_of_packets = 0;
spin_lock_irqsave(&subs->lock, flags);
frame_limit = subs->frame_limit + ep->max_urb_frames;
transfer_done = subs->transfer_done;
if (subs->lowlatency_playback &&
runtime->status->state != SNDRV_PCM_STATE_DRAINING) {
unsigned int hwptr = subs->hwptr_done / stride;
/* calculate the byte offset-in-buffer of the appl_ptr */
avail = (runtime->control->appl_ptr - runtime->hw_ptr_base)
% runtime->buffer_size;
if (avail <= hwptr)
avail += runtime->buffer_size;
avail -= hwptr;
}
for (i = 0; i < ctx->packets; i++) {
counts = snd_usb_endpoint_next_packet_size(ep, ctx, i, avail);
if (counts < 0)
break;
/* set up descriptor */
urb->iso_frame_desc[i].offset = frames * stride;
urb->iso_frame_desc[i].length = counts * stride;
frames += counts;
avail -= counts;
urb->number_of_packets++;
transfer_done += counts;
if (transfer_done >= runtime->period_size) {
transfer_done -= runtime->period_size;
frame_limit = 0;
period_elapsed = 1;
if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
if (transfer_done > 0) {
/* FIXME: fill-max mode is not
* supported yet */
frames -= transfer_done;
counts -= transfer_done;
urb->iso_frame_desc[i].length =
counts * stride;
transfer_done = 0;
}
i++;
if (i < ctx->packets) {
/* add a transfer delimiter */
urb->iso_frame_desc[i].offset =
frames * stride;
urb->iso_frame_desc[i].length = 0;
urb->number_of_packets++;
}
break;
}
}
/* finish at the period boundary or after enough frames */
if ((period_elapsed || transfer_done >= frame_limit) &&
!snd_usb_endpoint_implicit_feedback_sink(ep))
break;
}
if (!frames) {
err = -EAGAIN;
goto unlock;
}
bytes = frames * stride;
subs->transfer_done = transfer_done;
subs->frame_limit = frame_limit;
if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
subs->cur_audiofmt->dsd_dop)) {
fill_playback_urb_dsd_dop(subs, urb, bytes);
} else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
subs->cur_audiofmt->dsd_bitrev)) {
fill_playback_urb_dsd_bitrev(subs, urb, bytes);
} else {
/* usual PCM */
if (!subs->tx_length_quirk)
copy_to_urb(subs, urb, 0, stride, bytes);
else
bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
/* bytes is now amount of outgoing data */
}
subs->last_frame_number = usb_get_current_frame_number(subs->dev);
if (subs->trigger_tstamp_pending_update) {
/* this is the first actual URB submitted,
* update trigger timestamp to reflect actual start time
*/
snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
subs->trigger_tstamp_pending_update = false;
}
if (period_elapsed && !subs->running && subs->lowlatency_playback) {
subs->period_elapsed_pending = 1;
period_elapsed = 0;
}
unlock:
spin_unlock_irqrestore(&subs->lock, flags);
if (err < 0)
return err;
urb->transfer_buffer_length = bytes;
if (period_elapsed) {
if (in_stream_lock)
snd_pcm_period_elapsed_under_stream_lock(subs->pcm_substream);
else
snd_pcm_period_elapsed(subs->pcm_substream);
}
return 0;
}
/*
* process after playback data complete
* - decrease the delay count again
*/
static void retire_playback_urb(struct snd_usb_substream *subs,
struct urb *urb)
{
unsigned long flags;
struct snd_urb_ctx *ctx = urb->context;
bool period_elapsed = false;
spin_lock_irqsave(&subs->lock, flags);
if (ctx->queued) {
if (subs->inflight_bytes >= ctx->queued)
subs->inflight_bytes -= ctx->queued;
else
subs->inflight_bytes = 0;
}
subs->last_frame_number = usb_get_current_frame_number(subs->dev);
if (subs->running) {
period_elapsed = subs->period_elapsed_pending;
subs->period_elapsed_pending = 0;
}
spin_unlock_irqrestore(&subs->lock, flags);
if (period_elapsed)
snd_pcm_period_elapsed(subs->pcm_substream);
}
/* PCM ack callback for the playback stream;
* this plays a role only when the stream is running in low-latency mode.
*/
static int snd_usb_pcm_playback_ack(struct snd_pcm_substream *substream)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
struct snd_usb_endpoint *ep;
if (!subs->lowlatency_playback || !subs->running)
return 0;
ep = subs->data_endpoint;
if (!ep)
return 0;
/* When no more in-flight URBs available, try to process the pending
* outputs here
*/
if (!ep->active_mask)
snd_usb_queue_pending_output_urbs(ep, true);
return 0;
}
static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
int cmd)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
int err;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
subs->trigger_tstamp_pending_update = true;
fallthrough;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
snd_usb_endpoint_set_callback(subs->data_endpoint,
prepare_playback_urb,
retire_playback_urb,
subs);
if (subs->lowlatency_playback &&
cmd == SNDRV_PCM_TRIGGER_START) {
if (in_free_wheeling_mode(substream->runtime))
subs->lowlatency_playback = false;
err = start_endpoints(subs);
if (err < 0) {
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL, NULL, NULL);
return err;
}
}
subs->running = 1;
dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
subs->cur_audiofmt->iface,
subs->cur_audiofmt->altsetting);
return 0;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
stop_endpoints(subs, substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING);
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL, NULL, NULL);
subs->running = 0;
dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
subs->cur_audiofmt->iface,
subs->cur_audiofmt->altsetting);
return 0;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
/* keep retire_data_urb for delay calculation */
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL,
retire_playback_urb,
subs);
subs->running = 0;
dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
subs->cur_audiofmt->iface,
subs->cur_audiofmt->altsetting);
return 0;
}
return -EINVAL;
}
static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
int cmd)
{
int err;
struct snd_usb_substream *subs = substream->runtime->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
err = start_endpoints(subs);
if (err < 0)
return err;
fallthrough;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL, retire_capture_urb,
subs);
subs->last_frame_number = usb_get_current_frame_number(subs->dev);
subs->running = 1;
dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
subs->cur_audiofmt->iface,
subs->cur_audiofmt->altsetting);
return 0;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
stop_endpoints(subs, false);
fallthrough;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL, NULL, NULL);
subs->running = 0;
dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
subs->cur_audiofmt->iface,
subs->cur_audiofmt->altsetting);
return 0;
}
return -EINVAL;
}
static const struct snd_pcm_ops snd_usb_playback_ops = {
.open = snd_usb_pcm_open,
.close = snd_usb_pcm_close,
.hw_params = snd_usb_hw_params,
.hw_free = snd_usb_hw_free,
.prepare = snd_usb_pcm_prepare,
.trigger = snd_usb_substream_playback_trigger,
.sync_stop = snd_usb_pcm_sync_stop,
.pointer = snd_usb_pcm_pointer,
.ack = snd_usb_pcm_playback_ack,
};
static const struct snd_pcm_ops snd_usb_capture_ops = {
.open = snd_usb_pcm_open,
.close = snd_usb_pcm_close,
.hw_params = snd_usb_hw_params,
.hw_free = snd_usb_hw_free,
.prepare = snd_usb_pcm_prepare,
.trigger = snd_usb_substream_capture_trigger,
.sync_stop = snd_usb_pcm_sync_stop,
.pointer = snd_usb_pcm_pointer,
};
void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
{
const struct snd_pcm_ops *ops;
ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
&snd_usb_playback_ops : &snd_usb_capture_ops;
snd_pcm_set_ops(pcm, stream, ops);
}
void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
{
struct snd_pcm *pcm = subs->stream->pcm;
struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
struct device *dev = subs->dev->bus->sysdev;
if (snd_usb_use_vmalloc)
snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
NULL, 0, 0);
else
snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
dev, 64*1024, 512*1024);
}