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linux/sound/soc/soc-pcm.c
Takashi Iwai 9f620684c1
ASoC: soc-pcm: Move debugfs removal out of spinlock 
The recent fix for DPCM locking also covered the loop in
dpcm_be_disconnect() with the FE stream lock.  This caused an
unexpected side effect, thought: calling debugfs_remove_recursive() in
the spinlock may lead to lockdep splats as the code there assumes the
SOFTIRQ-safe context.

For avoiding the problem, this patch changes the disconnection
procedure to two phases: at first, the matching entries are removed
from the linked list, then the resources are freed outside the lock.

Fixes: b7898396f4 ("ASoC: soc-pcm: Fix and cleanup DPCM locking")
Reported-and-tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220119155249.26754-3-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-01-28 15:59:18 +00:00

3032 lines
79 KiB
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// SPDX-License-Identifier: GPL-2.0+
//
// soc-pcm.c -- ALSA SoC PCM
//
// Copyright 2005 Wolfson Microelectronics PLC.
// Copyright 2005 Openedhand Ltd.
// Copyright (C) 2010 Slimlogic Ltd.
// Copyright (C) 2010 Texas Instruments Inc.
//
// Authors: Liam Girdwood <lrg@ti.com>
// Mark Brown <broonie@opensource.wolfsonmicro.com>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/export.h>
#include <linux/debugfs.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dpcm.h>
#include <sound/soc-link.h>
#include <sound/initval.h>
static inline void snd_soc_dpcm_mutex_lock(struct snd_soc_pcm_runtime *rtd)
{
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
}
static inline void snd_soc_dpcm_mutex_unlock(struct snd_soc_pcm_runtime *rtd)
{
mutex_unlock(&rtd->card->pcm_mutex);
}
#define snd_soc_dpcm_mutex_assert_held(rtd) \
lockdep_assert_held(&(rtd)->card->pcm_mutex)
static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
int stream)
{
snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
}
#define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
int stream)
{
snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
}
#define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
#define DPCM_MAX_BE_USERS 8
static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
{
return (rtd)->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
}
static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
{
return (rtd)->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
}
#ifdef CONFIG_DEBUG_FS
static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
{
switch (state) {
case SND_SOC_DPCM_STATE_NEW:
return "new";
case SND_SOC_DPCM_STATE_OPEN:
return "open";
case SND_SOC_DPCM_STATE_HW_PARAMS:
return "hw_params";
case SND_SOC_DPCM_STATE_PREPARE:
return "prepare";
case SND_SOC_DPCM_STATE_START:
return "start";
case SND_SOC_DPCM_STATE_STOP:
return "stop";
case SND_SOC_DPCM_STATE_SUSPEND:
return "suspend";
case SND_SOC_DPCM_STATE_PAUSED:
return "paused";
case SND_SOC_DPCM_STATE_HW_FREE:
return "hw_free";
case SND_SOC_DPCM_STATE_CLOSE:
return "close";
}
return "unknown";
}
static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
int stream, char *buf, size_t size)
{
struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
struct snd_soc_dpcm *dpcm;
ssize_t offset = 0;
/* FE state */
offset += scnprintf(buf + offset, size - offset,
"[%s - %s]\n", fe->dai_link->name,
stream ? "Capture" : "Playback");
offset += scnprintf(buf + offset, size - offset, "State: %s\n",
dpcm_state_string(fe->dpcm[stream].state));
if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
(fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
offset += scnprintf(buf + offset, size - offset,
"Hardware Params: "
"Format = %s, Channels = %d, Rate = %d\n",
snd_pcm_format_name(params_format(params)),
params_channels(params),
params_rate(params));
/* BEs state */
offset += scnprintf(buf + offset, size - offset, "Backends:\n");
if (list_empty(&fe->dpcm[stream].be_clients)) {
offset += scnprintf(buf + offset, size - offset,
" No active DSP links\n");
goto out;
}
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
params = &dpcm->hw_params;
offset += scnprintf(buf + offset, size - offset,
"- %s\n", be->dai_link->name);
offset += scnprintf(buf + offset, size - offset,
" State: %s\n",
dpcm_state_string(be->dpcm[stream].state));
if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
(be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
offset += scnprintf(buf + offset, size - offset,
" Hardware Params: "
"Format = %s, Channels = %d, Rate = %d\n",
snd_pcm_format_name(params_format(params)),
params_channels(params),
params_rate(params));
}
out:
return offset;
}
static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct snd_soc_pcm_runtime *fe = file->private_data;
ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
int stream;
char *buf;
if (fe->num_cpus > 1) {
dev_err(fe->dev,
"%s doesn't support Multi CPU yet\n", __func__);
return -EINVAL;
}
buf = kmalloc(out_count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
snd_soc_dpcm_mutex_lock(fe);
for_each_pcm_streams(stream)
if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
offset += dpcm_show_state(fe, stream,
buf + offset,
out_count - offset);
snd_soc_dpcm_mutex_unlock(fe);
ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
kfree(buf);
return ret;
}
static const struct file_operations dpcm_state_fops = {
.open = simple_open,
.read = dpcm_state_read_file,
.llseek = default_llseek,
};
void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
{
if (!rtd->dai_link->dynamic)
return;
if (!rtd->card->debugfs_card_root)
return;
rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
rtd->card->debugfs_card_root);
debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
rtd, &dpcm_state_fops);
}
static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
{
char *name;
name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
stream ? "capture" : "playback");
if (name) {
dpcm->debugfs_state = debugfs_create_dir(
name, dpcm->fe->debugfs_dpcm_root);
debugfs_create_u32("state", 0644, dpcm->debugfs_state,
&dpcm->state);
kfree(name);
}
}
static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
{
debugfs_remove_recursive(dpcm->debugfs_state);
}
#else
static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
int stream)
{
}
static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
{
}
#endif
/* Set FE's runtime_update state; the state is protected via PCM stream lock
* for avoiding the race with trigger callback.
* If the state is unset and a trigger is pending while the previous operation,
* process the pending trigger action here.
*/
static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
int stream, enum snd_soc_dpcm_update state)
{
struct snd_pcm_substream *substream =
snd_soc_dpcm_get_substream(fe, stream);
snd_soc_dpcm_stream_lock_irq(fe, stream);
if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
dpcm_fe_dai_do_trigger(substream,
fe->dpcm[stream].trigger_pending - 1);
fe->dpcm[stream].trigger_pending = 0;
}
fe->dpcm[stream].runtime_update = state;
snd_soc_dpcm_stream_unlock_irq(fe, stream);
}
static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
int stream, enum snd_soc_dpcm_update state)
{
be->dpcm[stream].runtime_update = state;
}
/**
* snd_soc_runtime_action() - Increment/Decrement active count for
* PCM runtime components
* @rtd: ASoC PCM runtime that is activated
* @stream: Direction of the PCM stream
* @action: Activate stream if 1. Deactivate if -1.
*
* Increments/Decrements the active count for all the DAIs and components
* attached to a PCM runtime.
* Should typically be called when a stream is opened.
*
* Must be called with the rtd->card->pcm_mutex being held
*/
void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
int stream, int action)
{
struct snd_soc_dai *dai;
int i;
snd_soc_dpcm_mutex_assert_held(rtd);
for_each_rtd_dais(rtd, i, dai)
snd_soc_dai_action(dai, stream, action);
}
EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
/**
* snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
* @rtd: The ASoC PCM runtime that should be checked.
*
* This function checks whether the power down delay should be ignored for a
* specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
* been configured to ignore the delay, or if none of the components benefits
* from having the delay.
*/
bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
{
struct snd_soc_component *component;
bool ignore = true;
int i;
if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
return true;
for_each_rtd_components(rtd, i, component)
ignore &= !component->driver->use_pmdown_time;
return ignore;
}
/**
* snd_soc_set_runtime_hwparams - set the runtime hardware parameters
* @substream: the pcm substream
* @hw: the hardware parameters
*
* Sets the substream runtime hardware parameters.
*/
int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
const struct snd_pcm_hardware *hw)
{
substream->runtime->hw = *hw;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
/* DPCM stream event, send event to FE and all active BEs. */
int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
int event)
{
struct snd_soc_dpcm *dpcm;
snd_soc_dpcm_mutex_assert_held(fe);
for_each_dpcm_be(fe, dir, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
be->dai_link->name, event, dir);
if ((event == SND_SOC_DAPM_STREAM_STOP) &&
(be->dpcm[dir].users >= 1))
continue;
snd_soc_dapm_stream_event(be, dir, event);
}
snd_soc_dapm_stream_event(fe, dir, event);
return 0;
}
static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
struct snd_pcm_hw_params *params)
{
if (params) {
dai->rate = params_rate(params);
dai->channels = params_channels(params);
dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
} else {
dai->rate = 0;
dai->channels = 0;
dai->sample_bits = 0;
}
}
static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
struct snd_soc_dai *soc_dai)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
int ret;
if (!snd_soc_dai_active(soc_dai))
return 0;
#define __soc_pcm_apply_symmetry(name, NAME) \
if (soc_dai->name && (soc_dai->driver->symmetric_##name || \
rtd->dai_link->symmetric_##name)) { \
dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
#name, soc_dai->name); \
\
ret = snd_pcm_hw_constraint_single(substream->runtime, \
SNDRV_PCM_HW_PARAM_##NAME,\
soc_dai->name); \
if (ret < 0) { \
dev_err(soc_dai->dev, \
"ASoC: Unable to apply %s constraint: %d\n",\
#name, ret); \
return ret; \
} \
}
__soc_pcm_apply_symmetry(rate, RATE);
__soc_pcm_apply_symmetry(channels, CHANNELS);
__soc_pcm_apply_symmetry(sample_bits, SAMPLE_BITS);
return 0;
}
static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_dai d;
struct snd_soc_dai *dai;
struct snd_soc_dai *cpu_dai;
unsigned int symmetry, i;
d.name = __func__;
soc_pcm_set_dai_params(&d, params);
#define __soc_pcm_params_symmetry(xxx) \
symmetry = rtd->dai_link->symmetric_##xxx; \
for_each_rtd_dais(rtd, i, dai) \
symmetry |= dai->driver->symmetric_##xxx; \
\
if (symmetry) \
for_each_rtd_cpu_dais(rtd, i, cpu_dai) \
if (!snd_soc_dai_is_dummy(cpu_dai) && \
cpu_dai->xxx && cpu_dai->xxx != d.xxx) { \
dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
#xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
return -EINVAL; \
}
/* reject unmatched parameters when applying symmetry */
__soc_pcm_params_symmetry(rate);
__soc_pcm_params_symmetry(channels);
__soc_pcm_params_symmetry(sample_bits);
return 0;
}
static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_dai_link *link = rtd->dai_link;
struct snd_soc_dai *dai;
unsigned int symmetry, i;
symmetry = link->symmetric_rate ||
link->symmetric_channels ||
link->symmetric_sample_bits;
for_each_rtd_dais(rtd, i, dai)
symmetry = symmetry ||
dai->driver->symmetric_rate ||
dai->driver->symmetric_channels ||
dai->driver->symmetric_sample_bits;
if (symmetry)
substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
}
static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
int ret;
if (!bits)
return;
ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
if (ret != 0)
dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
bits, ret);
}
static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_dai *cpu_dai;
struct snd_soc_dai *codec_dai;
int stream = substream->stream;
int i;
unsigned int bits = 0, cpu_bits = 0;
for_each_rtd_codec_dais(rtd, i, codec_dai) {
struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
if (pcm_codec->sig_bits == 0) {
bits = 0;
break;
}
bits = max(pcm_codec->sig_bits, bits);
}
for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
if (pcm_cpu->sig_bits == 0) {
cpu_bits = 0;
break;
}
cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
}
soc_pcm_set_msb(substream, bits);
soc_pcm_set_msb(substream, cpu_bits);
}
static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
{
hw->rates = UINT_MAX;
hw->rate_min = 0;
hw->rate_max = UINT_MAX;
hw->channels_min = 0;
hw->channels_max = UINT_MAX;
hw->formats = ULLONG_MAX;
}
static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
struct snd_soc_pcm_stream *p)
{
hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
/* setup hw->rate_min/max via hw->rates first */
snd_pcm_hw_limit_rates(hw);
/* update hw->rate_min/max by snd_soc_pcm_stream */
hw->rate_min = max(hw->rate_min, p->rate_min);
hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
}
static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
struct snd_soc_pcm_stream *p)
{
hw->channels_min = max(hw->channels_min, p->channels_min);
hw->channels_max = min(hw->channels_max, p->channels_max);
}
static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
struct snd_soc_pcm_stream *p)
{
hw->formats &= p->formats;
}
/**
* snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
* @rtd: ASoC PCM runtime
* @hw: PCM hardware parameters (output)
* @stream: Direction of the PCM stream
*
* Calculates the subset of stream parameters supported by all DAIs
* associated with the PCM stream.
*/
int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_hardware *hw, int stream)
{
struct snd_soc_dai *codec_dai;
struct snd_soc_dai *cpu_dai;
struct snd_soc_pcm_stream *codec_stream;
struct snd_soc_pcm_stream *cpu_stream;
unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
int i;
soc_pcm_hw_init(hw);
/* first calculate min/max only for CPUs in the DAI link */
for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
/*
* Skip CPUs which don't support the current stream type.
* Otherwise, since the rate, channel, and format values will
* zero in that case, we would have no usable settings left,
* causing the resulting setup to fail.
*/
if (!snd_soc_dai_stream_valid(cpu_dai, stream))
continue;
cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
soc_pcm_hw_update_chan(hw, cpu_stream);
soc_pcm_hw_update_rate(hw, cpu_stream);
soc_pcm_hw_update_format(hw, cpu_stream);
}
cpu_chan_min = hw->channels_min;
cpu_chan_max = hw->channels_max;
/* second calculate min/max only for CODECs in the DAI link */
for_each_rtd_codec_dais(rtd, i, codec_dai) {
/*
* Skip CODECs which don't support the current stream type.
* Otherwise, since the rate, channel, and format values will
* zero in that case, we would have no usable settings left,
* causing the resulting setup to fail.
*/
if (!snd_soc_dai_stream_valid(codec_dai, stream))
continue;
codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
soc_pcm_hw_update_chan(hw, codec_stream);
soc_pcm_hw_update_rate(hw, codec_stream);
soc_pcm_hw_update_format(hw, codec_stream);
}
/* Verify both a valid CPU DAI and a valid CODEC DAI were found */
if (!hw->channels_min)
return -EINVAL;
/*
* chan min/max cannot be enforced if there are multiple CODEC DAIs
* connected to CPU DAI(s), use CPU DAI's directly and let
* channel allocation be fixed up later
*/
if (rtd->num_codecs > 1) {
hw->channels_min = cpu_chan_min;
hw->channels_max = cpu_chan_max;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
{
struct snd_pcm_hardware *hw = &substream->runtime->hw;
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
u64 formats = hw->formats;
/*
* At least one CPU and one CODEC should match. Otherwise, we should
* have bailed out on a higher level, since there would be no CPU or
* CODEC to support the transfer direction in that case.
*/
snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
if (formats)
hw->formats &= formats;
}
static int soc_pcm_components_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_component *component;
int i, ret = 0;
for_each_rtd_components(rtd, i, component) {
ret = snd_soc_component_module_get_when_open(component, substream);
if (ret < 0)
break;
ret = snd_soc_component_open(component, substream);
if (ret < 0)
break;
}
return ret;
}
static int soc_pcm_components_close(struct snd_pcm_substream *substream,
int rollback)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_component *component;
int i, ret = 0;
for_each_rtd_components(rtd, i, component) {
int r = snd_soc_component_close(component, substream, rollback);
if (r < 0)
ret = r; /* use last ret */
snd_soc_component_module_put_when_close(component, substream, rollback);
}
return ret;
}
static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream, int rollback)
{
struct snd_soc_component *component;
struct snd_soc_dai *dai;
int i;
snd_soc_dpcm_mutex_assert_held(rtd);
if (!rollback)
snd_soc_runtime_deactivate(rtd, substream->stream);
for_each_rtd_dais(rtd, i, dai)
snd_soc_dai_shutdown(dai, substream, rollback);
snd_soc_link_shutdown(substream, rollback);
soc_pcm_components_close(substream, rollback);
snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
for_each_rtd_components(rtd, i, component)
if (!snd_soc_component_active(component))
pinctrl_pm_select_sleep_state(component->dev);
return 0;
}
/*
* Called by ALSA when a PCM substream is closed. Private data can be
* freed here. The cpu DAI, codec DAI, machine and components are also
* shutdown.
*/
static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream)
{
return soc_pcm_clean(rtd, substream, 0);
}
/* PCM close ops for non-DPCM streams */
static int soc_pcm_close(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
snd_soc_dpcm_mutex_lock(rtd);
soc_pcm_clean(rtd, substream, 0);
snd_soc_dpcm_mutex_unlock(rtd);
return 0;
}
static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_pcm_hardware *hw = &substream->runtime->hw;
const char *name_cpu = soc_cpu_dai_name(rtd);
const char *name_codec = soc_codec_dai_name(rtd);
const char *err_msg;
struct device *dev = rtd->dev;
err_msg = "rates";
if (!hw->rates)
goto config_err;
err_msg = "formats";
if (!hw->formats)
goto config_err;
err_msg = "channels";
if (!hw->channels_min || !hw->channels_max ||
hw->channels_min > hw->channels_max)
goto config_err;
dev_dbg(dev, "ASoC: %s <-> %s info:\n", name_codec,
name_cpu);
dev_dbg(dev, "ASoC: rate mask 0x%x\n", hw->rates);
dev_dbg(dev, "ASoC: ch min %d max %d\n", hw->channels_min,
hw->channels_max);
dev_dbg(dev, "ASoC: rate min %d max %d\n", hw->rate_min,
hw->rate_max);
return 0;
config_err:
dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
name_codec, name_cpu, err_msg);
return -EINVAL;
}
/*
* Called by ALSA when a PCM substream is opened, the runtime->hw record is
* then initialized and any private data can be allocated. This also calls
* startup for the cpu DAI, component, machine and codec DAI.
*/
static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream)
{
struct snd_soc_component *component;
struct snd_soc_dai *dai;
int i, ret = 0;
snd_soc_dpcm_mutex_assert_held(rtd);
for_each_rtd_components(rtd, i, component)
pinctrl_pm_select_default_state(component->dev);
ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
if (ret < 0)
goto err;
ret = soc_pcm_components_open(substream);
if (ret < 0)
goto err;
ret = snd_soc_link_startup(substream);
if (ret < 0)
goto err;
/* startup the audio subsystem */
for_each_rtd_dais(rtd, i, dai) {
ret = snd_soc_dai_startup(dai, substream);
if (ret < 0)
goto err;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dai->tx_mask = 0;
else
dai->rx_mask = 0;
}
/* Dynamic PCM DAI links compat checks use dynamic capabilities */
if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
goto dynamic;
/* Check that the codec and cpu DAIs are compatible */
soc_pcm_init_runtime_hw(substream);
soc_pcm_update_symmetry(substream);
ret = soc_hw_sanity_check(substream);
if (ret < 0)
goto err;
soc_pcm_apply_msb(substream);
/* Symmetry only applies if we've already got an active stream. */
for_each_rtd_dais(rtd, i, dai) {
ret = soc_pcm_apply_symmetry(substream, dai);
if (ret != 0)
goto err;
}
dynamic:
snd_soc_runtime_activate(rtd, substream->stream);
ret = 0;
err:
if (ret < 0) {
soc_pcm_clean(rtd, substream, 1);
dev_err(rtd->dev, "%s() failed (%d)", __func__, ret);
}
return ret;
}
/* PCM open ops for non-DPCM streams */
static int soc_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
int ret;
snd_soc_dpcm_mutex_lock(rtd);
ret = __soc_pcm_open(rtd, substream);
snd_soc_dpcm_mutex_unlock(rtd);
return ret;
}
static void codec2codec_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
{
/*
* Currently nothing to do for c2c links
* Since c2c links are internal nodes in the DAPM graph and
* don't interface with the outside world or application layer
* we don't have to do any special handling on close.
*/
}
/*
* Called by ALSA when the PCM substream is prepared, can set format, sample
* rate, etc. This function is non atomic and can be called multiple times,
* it can refer to the runtime info.
*/
static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream)
{
struct snd_soc_dai *dai;
int i, ret = 0;
snd_soc_dpcm_mutex_assert_held(rtd);
ret = snd_soc_link_prepare(substream);
if (ret < 0)
goto out;
ret = snd_soc_pcm_component_prepare(substream);
if (ret < 0)
goto out;
ret = snd_soc_pcm_dai_prepare(substream);
if (ret < 0)
goto out;
/* cancel any delayed stream shutdown that is pending */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
rtd->pop_wait) {
rtd->pop_wait = 0;
cancel_delayed_work(&rtd->delayed_work);
}
snd_soc_dapm_stream_event(rtd, substream->stream,
SND_SOC_DAPM_STREAM_START);
for_each_rtd_dais(rtd, i, dai)
snd_soc_dai_digital_mute(dai, 0, substream->stream);
out:
if (ret < 0)
dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
return ret;
}
/* PCM prepare ops for non-DPCM streams */
static int soc_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
int ret;
snd_soc_dpcm_mutex_lock(rtd);
ret = __soc_pcm_prepare(rtd, substream);
snd_soc_dpcm_mutex_unlock(rtd);
return ret;
}
static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
unsigned int mask)
{
struct snd_interval *interval;
int channels = hweight_long(mask);
interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
interval->min = channels;
interval->max = channels;
}
static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream, int rollback)
{
struct snd_soc_dai *dai;
int i;
snd_soc_dpcm_mutex_assert_held(rtd);
/* clear the corresponding DAIs parameters when going to be inactive */
for_each_rtd_dais(rtd, i, dai) {
if (snd_soc_dai_active(dai) == 1)
soc_pcm_set_dai_params(dai, NULL);
if (snd_soc_dai_stream_active(dai, substream->stream) == 1)
snd_soc_dai_digital_mute(dai, 1, substream->stream);
}
/* run the stream event */
snd_soc_dapm_stream_stop(rtd, substream->stream);
/* free any machine hw params */
snd_soc_link_hw_free(substream, rollback);
/* free any component resources */
snd_soc_pcm_component_hw_free(substream, rollback);
/* now free hw params for the DAIs */
for_each_rtd_dais(rtd, i, dai)
if (snd_soc_dai_stream_valid(dai, substream->stream))
snd_soc_dai_hw_free(dai, substream, rollback);
return 0;
}
/*
* Frees resources allocated by hw_params, can be called multiple times
*/
static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream)
{
return soc_pcm_hw_clean(rtd, substream, 0);
}
/* hw_free PCM ops for non-DPCM streams */
static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
int ret;
snd_soc_dpcm_mutex_lock(rtd);
ret = __soc_pcm_hw_free(rtd, substream);
snd_soc_dpcm_mutex_unlock(rtd);
return ret;
}
/*
* Called by ALSA when the hardware params are set by application. This
* function can also be called multiple times and can allocate buffers
* (using snd_pcm_lib_* ). It's non-atomic.
*/
static int __soc_pcm_hw_params(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_dai *cpu_dai;
struct snd_soc_dai *codec_dai;
int i, ret = 0;
snd_soc_dpcm_mutex_assert_held(rtd);
ret = soc_pcm_params_symmetry(substream, params);
if (ret)
goto out;
ret = snd_soc_link_hw_params(substream, params);
if (ret < 0)
goto out;
for_each_rtd_codec_dais(rtd, i, codec_dai) {
struct snd_pcm_hw_params codec_params;
/*
* Skip CODECs which don't support the current stream type,
* the idea being that if a CODEC is not used for the currently
* set up transfer direction, it should not need to be
* configured, especially since the configuration used might
* not even be supported by that CODEC. There may be cases
* however where a CODEC needs to be set up although it is
* actually not being used for the transfer, e.g. if a
* capture-only CODEC is acting as an LRCLK and/or BCLK master
* for the DAI link including a playback-only CODEC.
* If this becomes necessary, we will have to augment the
* machine driver setup with information on how to act, so
* we can do the right thing here.
*/
if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
continue;
/* copy params for each codec */
codec_params = *params;
/* fixup params based on TDM slot masks */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
codec_dai->tx_mask)
soc_pcm_codec_params_fixup(&codec_params,
codec_dai->tx_mask);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
codec_dai->rx_mask)
soc_pcm_codec_params_fixup(&codec_params,
codec_dai->rx_mask);
ret = snd_soc_dai_hw_params(codec_dai, substream,
&codec_params);
if(ret < 0)
goto out;
soc_pcm_set_dai_params(codec_dai, &codec_params);
snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
}
for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
/*
* Skip CPUs which don't support the current stream
* type. See soc_pcm_init_runtime_hw() for more details
*/
if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
continue;
ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
if (ret < 0)
goto out;
/* store the parameters for each DAI */
soc_pcm_set_dai_params(cpu_dai, params);
snd_soc_dapm_update_dai(substream, params, cpu_dai);
}
ret = snd_soc_pcm_component_hw_params(substream, params);
out:
if (ret < 0) {
soc_pcm_hw_clean(rtd, substream, 1);
dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
}
return ret;
}
/* hw_params PCM ops for non-DPCM streams */
static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
int ret;
snd_soc_dpcm_mutex_lock(rtd);
ret = __soc_pcm_hw_params(rtd, substream, params);
snd_soc_dpcm_mutex_unlock(rtd);
return ret;
}
static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
int ret = -EINVAL, _ret = 0;
int rollback = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
ret = snd_soc_link_trigger(substream, cmd, 0);
if (ret < 0)
goto start_err;
ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
if (ret < 0)
goto start_err;
ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
start_err:
if (ret < 0)
rollback = 1;
}
if (rollback) {
_ret = ret;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
cmd = SNDRV_PCM_TRIGGER_STOP;
break;
case SNDRV_PCM_TRIGGER_RESUME:
cmd = SNDRV_PCM_TRIGGER_SUSPEND;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
break;
}
}
switch (cmd) {
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (rtd->dai_link->stop_dma_first) {
ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
if (ret < 0)
break;
ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
if (ret < 0)
break;
} else {
ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
if (ret < 0)
break;
ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
if (ret < 0)
break;
}
ret = snd_soc_link_trigger(substream, cmd, rollback);
break;
}
if (_ret)
ret = _ret;
return ret;
}
/*
* soc level wrapper for pointer callback
* If cpu_dai, codec_dai, component driver has the delay callback, then
* the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
*/
static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t offset = 0;
snd_pcm_sframes_t codec_delay = 0;
snd_pcm_sframes_t cpu_delay = 0;
offset = snd_soc_pcm_component_pointer(substream);
/* should be called *after* snd_soc_pcm_component_pointer() */
snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
runtime->delay = cpu_delay + codec_delay;
return offset;
}
/* connect a FE and BE */
static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
struct snd_pcm_substream *fe_substream;
struct snd_pcm_substream *be_substream;
struct snd_soc_dpcm *dpcm;
snd_soc_dpcm_mutex_assert_held(fe);
/* only add new dpcms */
for_each_dpcm_be(fe, stream, dpcm) {
if (dpcm->be == be && dpcm->fe == fe)
return 0;
}
fe_substream = snd_soc_dpcm_get_substream(fe, stream);
be_substream = snd_soc_dpcm_get_substream(be, stream);
if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
__func__);
return -EINVAL;
}
if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
dev_warn(be->dev, "%s: FE is nonatomic but BE is not, forcing BE as nonatomic\n",
__func__);
be_substream->pcm->nonatomic = 1;
}
dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_ATOMIC);
if (!dpcm)
return -ENOMEM;
dpcm->be = be;
dpcm->fe = fe;
be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
snd_soc_dpcm_stream_lock_irq(fe, stream);
list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
snd_soc_dpcm_stream_unlock_irq(fe, stream);
dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
stream ? "capture" : "playback", fe->dai_link->name,
stream ? "<-" : "->", be->dai_link->name);
dpcm_create_debugfs_state(dpcm, stream);
return 1;
}
/* reparent a BE onto another FE */
static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
struct snd_soc_dpcm *dpcm;
struct snd_pcm_substream *fe_substream, *be_substream;
/* reparent if BE is connected to other FEs */
if (!be->dpcm[stream].users)
return;
be_substream = snd_soc_dpcm_get_substream(be, stream);
for_each_dpcm_fe(be, stream, dpcm) {
if (dpcm->fe == fe)
continue;
dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
stream ? "capture" : "playback",
dpcm->fe->dai_link->name,
stream ? "<-" : "->", dpcm->be->dai_link->name);
fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
be_substream->runtime = fe_substream->runtime;
break;
}
}
/* disconnect a BE and FE */
void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm, *d;
LIST_HEAD(deleted_dpcms);
snd_soc_dpcm_mutex_assert_held(fe);
snd_soc_dpcm_stream_lock_irq(fe, stream);
for_each_dpcm_be_safe(fe, stream, dpcm, d) {
dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
stream ? "capture" : "playback",
dpcm->be->dai_link->name);
if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
continue;
dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
stream ? "capture" : "playback", fe->dai_link->name,
stream ? "<-" : "->", dpcm->be->dai_link->name);
/* BEs still alive need new FE */
dpcm_be_reparent(fe, dpcm->be, stream);
list_del(&dpcm->list_be);
list_move(&dpcm->list_fe, &deleted_dpcms);
}
snd_soc_dpcm_stream_unlock_irq(fe, stream);
while (!list_empty(&deleted_dpcms)) {
dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
list_fe);
list_del(&dpcm->list_fe);
dpcm_remove_debugfs_state(dpcm);
kfree(dpcm);
}
}
/* get BE for DAI widget and stream */
static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
struct snd_soc_dapm_widget *widget, int stream)
{
struct snd_soc_pcm_runtime *be;
struct snd_soc_dapm_widget *w;
struct snd_soc_dai *dai;
int i;
dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
for_each_card_rtds(card, be) {
if (!be->dai_link->no_pcm)
continue;
for_each_rtd_dais(be, i, dai) {
w = snd_soc_dai_get_widget(dai, stream);
dev_dbg(card->dev, "ASoC: try BE : %s\n",
w ? w->name : "(not set)");
if (w == widget)
return be;
}
}
/* Widget provided is not a BE */
return NULL;
}
static int widget_in_list(struct snd_soc_dapm_widget_list *list,
struct snd_soc_dapm_widget *widget)
{
struct snd_soc_dapm_widget *w;
int i;
for_each_dapm_widgets(list, i, w)
if (widget == w)
return 1;
return 0;
}
bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
{
struct snd_soc_card *card = widget->dapm->card;
struct snd_soc_pcm_runtime *rtd;
int stream;
/* adjust dir to stream */
if (dir == SND_SOC_DAPM_DIR_OUT)
stream = SNDRV_PCM_STREAM_PLAYBACK;
else
stream = SNDRV_PCM_STREAM_CAPTURE;
rtd = dpcm_get_be(card, widget, stream);
if (rtd)
return true;
return false;
}
EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
int stream, struct snd_soc_dapm_widget_list **list)
{
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
int paths;
if (fe->num_cpus > 1) {
dev_err(fe->dev,
"%s doesn't support Multi CPU yet\n", __func__);
return -EINVAL;
}
/* get number of valid DAI paths and their widgets */
paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
fe->card->component_chaining ?
NULL : dpcm_end_walk_at_be);
if (paths > 0)
dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
stream ? "capture" : "playback");
else if (paths == 0)
dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
stream ? "capture" : "playback");
return paths;
}
void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
{
snd_soc_dapm_dai_free_widgets(list);
}
static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
struct snd_soc_dapm_widget_list *list)
{
struct snd_soc_dai *dai;
unsigned int i;
/* is there a valid DAI widget for this BE */
for_each_rtd_dais(dpcm->be, i, dai) {
struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
/*
* The BE is pruned only if none of the dai
* widgets are in the active list.
*/
if (widget && widget_in_list(list, widget))
return true;
}
return false;
}
static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
struct snd_soc_dapm_widget_list **list_)
{
struct snd_soc_dpcm *dpcm;
int prune = 0;
/* Destroy any old FE <--> BE connections */
for_each_dpcm_be(fe, stream, dpcm) {
if (dpcm_be_is_active(dpcm, stream, *list_))
continue;
dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
stream ? "capture" : "playback",
dpcm->be->dai_link->name, fe->dai_link->name);
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
prune++;
}
dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
return prune;
}
static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
struct snd_soc_dapm_widget_list **list_)
{
struct snd_soc_card *card = fe->card;
struct snd_soc_dapm_widget_list *list = *list_;
struct snd_soc_pcm_runtime *be;
struct snd_soc_dapm_widget *widget;
int i, new = 0, err;
/* Create any new FE <--> BE connections */
for_each_dapm_widgets(list, i, widget) {
switch (widget->id) {
case snd_soc_dapm_dai_in:
if (stream != SNDRV_PCM_STREAM_PLAYBACK)
continue;
break;
case snd_soc_dapm_dai_out:
if (stream != SNDRV_PCM_STREAM_CAPTURE)
continue;
break;
default:
continue;
}
/* is there a valid BE rtd for this widget */
be = dpcm_get_be(card, widget, stream);
if (!be) {
dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
widget->name);
continue;
}
/* don't connect if FE is not running */
if (!fe->dpcm[stream].runtime && !fe->fe_compr)
continue;
/*
* Filter for systems with 'component_chaining' enabled.
* This helps to avoid unnecessary re-configuration of an
* already active BE on such systems.
*/
if (fe->card->component_chaining &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
continue;
/* newly connected FE and BE */
err = dpcm_be_connect(fe, be, stream);
if (err < 0) {
dev_err(fe->dev, "ASoC: can't connect %s\n",
widget->name);
break;
} else if (err == 0) /* already connected */
continue;
/* new */
dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
new++;
}
dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
return new;
}
/*
* Find the corresponding BE DAIs that source or sink audio to this
* FE substream.
*/
int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
int stream, struct snd_soc_dapm_widget_list **list, int new)
{
if (new)
return dpcm_add_paths(fe, stream, list);
else
return dpcm_prune_paths(fe, stream, list);
}
void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
for_each_dpcm_be(fe, stream, dpcm)
dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
}
void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
int do_hw_free, struct snd_soc_dpcm *last)
{
struct snd_soc_dpcm *dpcm;
/* disable any enabled and non active backends */
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *be_substream =
snd_soc_dpcm_get_substream(be, stream);
if (dpcm == last)
return;
/* is this op for this BE ? */
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
if (be->dpcm[stream].users == 0) {
dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
continue;
}
if (--be->dpcm[stream].users != 0)
continue;
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
if (!do_hw_free)
continue;
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
__soc_pcm_hw_free(be, be_substream);
be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
}
}
__soc_pcm_close(be, be_substream);
be_substream->runtime = NULL;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
}
}
int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_pcm_runtime *be;
struct snd_soc_dpcm *dpcm;
int err, count = 0;
/* only startup BE DAIs that are either sinks or sources to this FE DAI */
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_pcm_substream *be_substream;
be = dpcm->be;
be_substream = snd_soc_dpcm_get_substream(be, stream);
if (!be_substream) {
dev_err(be->dev, "ASoC: no backend %s stream\n",
stream ? "capture" : "playback");
continue;
}
/* is this op for this BE ? */
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
/* first time the dpcm is open ? */
if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
dev_err(be->dev, "ASoC: too many users %s at open %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
continue;
}
if (be->dpcm[stream].users++ != 0)
continue;
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
continue;
dev_dbg(be->dev, "ASoC: open %s BE %s\n",
stream ? "capture" : "playback", be->dai_link->name);
be_substream->runtime = be->dpcm[stream].runtime;
err = __soc_pcm_open(be, be_substream);
if (err < 0) {
be->dpcm[stream].users--;
if (be->dpcm[stream].users < 0)
dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
goto unwind;
}
be->dpcm[stream].be_start = 0;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
count++;
}
return count;
unwind:
dpcm_be_dai_startup_rollback(fe, stream, dpcm);
dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
__func__, be->dai_link->name, err);
return err;
}
static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hardware *hw = &runtime->hw;
struct snd_soc_dai *dai;
int stream = substream->stream;
int i;
soc_pcm_hw_init(hw);
for_each_rtd_cpu_dais(fe, i, dai) {
struct snd_soc_pcm_stream *cpu_stream;
/*
* Skip CPUs which don't support the current stream
* type. See soc_pcm_init_runtime_hw() for more details
*/
if (!snd_soc_dai_stream_valid(dai, stream))
continue;
cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
soc_pcm_hw_update_rate(hw, cpu_stream);
soc_pcm_hw_update_chan(hw, cpu_stream);
soc_pcm_hw_update_format(hw, cpu_stream);
}
}
static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hardware *hw = &runtime->hw;
struct snd_soc_dpcm *dpcm;
struct snd_soc_dai *dai;
int stream = substream->stream;
if (!fe->dai_link->dpcm_merged_format)
return;
/*
* It returns merged BE codec format
* if FE want to use it (= dpcm_merged_format)
*/
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_soc_pcm_stream *codec_stream;
int i;
for_each_rtd_codec_dais(be, i, dai) {
/*
* Skip CODECs which don't support the current stream
* type. See soc_pcm_init_runtime_hw() for more details
*/
if (!snd_soc_dai_stream_valid(dai, stream))
continue;
codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
soc_pcm_hw_update_format(hw, codec_stream);
}
}
}
static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hardware *hw = &runtime->hw;
struct snd_soc_dpcm *dpcm;
int stream = substream->stream;
if (!fe->dai_link->dpcm_merged_chan)
return;
/*
* It returns merged BE codec channel;
* if FE want to use it (= dpcm_merged_chan)
*/
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_soc_pcm_stream *cpu_stream;
struct snd_soc_dai *dai;
int i;
for_each_rtd_cpu_dais(be, i, dai) {
/*
* Skip CPUs which don't support the current stream
* type. See soc_pcm_init_runtime_hw() for more details
*/
if (!snd_soc_dai_stream_valid(dai, stream))
continue;
cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
soc_pcm_hw_update_chan(hw, cpu_stream);
}
/*
* chan min/max cannot be enforced if there are multiple CODEC
* DAIs connected to a single CPU DAI, use CPU DAI's directly
*/
if (be->num_codecs == 1) {
struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
asoc_rtd_to_codec(be, 0), stream);
soc_pcm_hw_update_chan(hw, codec_stream);
}
}
}
static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hardware *hw = &runtime->hw;
struct snd_soc_dpcm *dpcm;
int stream = substream->stream;
if (!fe->dai_link->dpcm_merged_rate)
return;
/*
* It returns merged BE codec channel;
* if FE want to use it (= dpcm_merged_chan)
*/
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_soc_pcm_stream *pcm;
struct snd_soc_dai *dai;
int i;
for_each_rtd_dais(be, i, dai) {
/*
* Skip DAIs which don't support the current stream
* type. See soc_pcm_init_runtime_hw() for more details
*/
if (!snd_soc_dai_stream_valid(dai, stream))
continue;
pcm = snd_soc_dai_get_pcm_stream(dai, stream);
soc_pcm_hw_update_rate(hw, pcm);
}
}
}
static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
int stream)
{
struct snd_soc_dpcm *dpcm;
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
struct snd_soc_dai *fe_cpu_dai;
int err = 0;
int i;
/* apply symmetry for FE */
soc_pcm_update_symmetry(fe_substream);
for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
/* Symmetry only applies if we've got an active stream. */
err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
if (err < 0)
goto error;
}
/* apply symmetry for BE */
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *be_substream =
snd_soc_dpcm_get_substream(be, stream);
struct snd_soc_pcm_runtime *rtd;
struct snd_soc_dai *dai;
/* A backend may not have the requested substream */
if (!be_substream)
continue;
rtd = asoc_substream_to_rtd(be_substream);
if (rtd->dai_link->be_hw_params_fixup)
continue;
soc_pcm_update_symmetry(be_substream);
/* Symmetry only applies if we've got an active stream. */
for_each_rtd_dais(rtd, i, dai) {
err = soc_pcm_apply_symmetry(fe_substream, dai);
if (err < 0)
goto error;
}
}
error:
if (err < 0)
dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, err);
return err;
}
static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
int stream = fe_substream->stream, ret = 0;
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
ret = dpcm_be_dai_startup(fe, stream);
if (ret < 0)
goto be_err;
dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
/* start the DAI frontend */
ret = __soc_pcm_open(fe, fe_substream);
if (ret < 0)
goto unwind;
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
dpcm_runtime_setup_fe(fe_substream);
dpcm_runtime_setup_be_format(fe_substream);
dpcm_runtime_setup_be_chan(fe_substream);
dpcm_runtime_setup_be_rate(fe_substream);
ret = dpcm_apply_symmetry(fe_substream, stream);
unwind:
if (ret < 0)
dpcm_be_dai_startup_unwind(fe, stream);
be_err:
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
if (ret < 0)
dev_err(fe->dev, "%s() failed (%d)\n", __func__, ret);
return ret;
}
static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
int stream = substream->stream;
snd_soc_dpcm_mutex_assert_held(fe);
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
/* shutdown the BEs */
dpcm_be_dai_shutdown(fe, stream);
dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
/* now shutdown the frontend */
__soc_pcm_close(fe, substream);
/* run the stream stop event */
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
return 0;
}
void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
/* only hw_params backends that are either sinks or sources
* to this frontend DAI */
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *be_substream =
snd_soc_dpcm_get_substream(be, stream);
/* is this op for this BE ? */
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
/* only free hw when no longer used - check all FEs */
if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
continue;
/* do not free hw if this BE is used by other FE */
if (be->dpcm[stream].users > 1)
continue;
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
continue;
dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
be->dai_link->name);
__soc_pcm_hw_free(be, be_substream);
be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
}
}
static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
int stream = substream->stream;
snd_soc_dpcm_mutex_lock(fe);
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
/* call hw_free on the frontend */
soc_pcm_hw_clean(fe, substream, 0);
/* only hw_params backends that are either sinks or sources
* to this frontend DAI */
dpcm_be_dai_hw_free(fe, stream);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
snd_soc_dpcm_mutex_unlock(fe);
return 0;
}
int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_pcm_runtime *be;
struct snd_pcm_substream *be_substream;
struct snd_soc_dpcm *dpcm;
int ret;
for_each_dpcm_be(fe, stream, dpcm) {
be = dpcm->be;
be_substream = snd_soc_dpcm_get_substream(be, stream);
/* is this op for this BE ? */
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
/* copy params for each dpcm */
memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
sizeof(struct snd_pcm_hw_params));
/* perform any hw_params fixups */
ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
if (ret < 0)
goto unwind;
/* copy the fixed-up hw params for BE dai */
memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
sizeof(struct snd_pcm_hw_params));
/* only allow hw_params() if no connected FEs are running */
if (!snd_soc_dpcm_can_be_params(fe, be, stream))
continue;
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
continue;
dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
be->dai_link->name);
ret = __soc_pcm_hw_params(be, be_substream, &dpcm->hw_params);
if (ret < 0)
goto unwind;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
}
return 0;
unwind:
dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
__func__, be->dai_link->name, ret);
/* disable any enabled and non active backends */
for_each_dpcm_be_rollback(fe, stream, dpcm) {
be = dpcm->be;
be_substream = snd_soc_dpcm_get_substream(be, stream);
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
/* only allow hw_free() if no connected FEs are running */
if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
continue;
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
continue;
__soc_pcm_hw_free(be, be_substream);
}
return ret;
}
static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
int ret, stream = substream->stream;
snd_soc_dpcm_mutex_lock(fe);
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
memcpy(&fe->dpcm[stream].hw_params, params,
sizeof(struct snd_pcm_hw_params));
ret = dpcm_be_dai_hw_params(fe, stream);
if (ret < 0)
goto out;
dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
fe->dai_link->name, params_rate(params),
params_channels(params), params_format(params));
/* call hw_params on the frontend */
ret = __soc_pcm_hw_params(fe, substream, params);
if (ret < 0)
dpcm_be_dai_hw_free(fe, stream);
else
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
out:
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
snd_soc_dpcm_mutex_unlock(fe);
if (ret < 0)
dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, ret);
return ret;
}
int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
int cmd)
{
struct snd_soc_pcm_runtime *be;
struct snd_soc_dpcm *dpcm;
unsigned long flags;
int ret = 0;
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_pcm_substream *be_substream;
be = dpcm->be;
be_substream = snd_soc_dpcm_get_substream(be, stream);
snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
/* is this op for this BE ? */
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
goto next;
dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
be->dai_link->name, cmd);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
if (!be->dpcm[stream].be_start &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
goto next;
be->dpcm[stream].be_start++;
if (be->dpcm[stream].be_start != 1)
goto next;
ret = soc_pcm_trigger(be_substream, cmd);
if (ret) {
be->dpcm[stream].be_start--;
goto next;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
case SNDRV_PCM_TRIGGER_RESUME:
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
goto next;
be->dpcm[stream].be_start++;
if (be->dpcm[stream].be_start != 1)
goto next;
ret = soc_pcm_trigger(be_substream, cmd);
if (ret) {
be->dpcm[stream].be_start--;
goto next;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (!be->dpcm[stream].be_start &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
goto next;
be->dpcm[stream].be_start++;
if (be->dpcm[stream].be_start != 1)
goto next;
ret = soc_pcm_trigger(be_substream, cmd);
if (ret) {
be->dpcm[stream].be_start--;
goto next;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
case SNDRV_PCM_TRIGGER_STOP:
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
goto next;
if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
be->dpcm[stream].be_start--;
if (be->dpcm[stream].be_start != 0)
goto next;
ret = soc_pcm_trigger(be_substream, cmd);
if (ret) {
if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
be->dpcm[stream].be_start++;
goto next;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
goto next;
be->dpcm[stream].be_start--;
if (be->dpcm[stream].be_start != 0)
goto next;
ret = soc_pcm_trigger(be_substream, cmd);
if (ret) {
be->dpcm[stream].be_start++;
goto next;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
goto next;
be->dpcm[stream].be_start--;
if (be->dpcm[stream].be_start != 0)
goto next;
ret = soc_pcm_trigger(be_substream, cmd);
if (ret) {
be->dpcm[stream].be_start++;
goto next;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
break;
}
next:
snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
if (ret)
break;
}
if (ret < 0)
dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
__func__, be->dai_link->name, ret);
return ret;
}
EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
int cmd, bool fe_first)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
int ret;
/* call trigger on the frontend before the backend. */
if (fe_first) {
dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
fe->dai_link->name, cmd);
ret = soc_pcm_trigger(substream, cmd);
if (ret < 0)
return ret;
ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
return ret;
}
/* call trigger on the frontend after the backend. */
ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
if (ret < 0)
return ret;
dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
fe->dai_link->name, cmd);
ret = soc_pcm_trigger(substream, cmd);
return ret;
}
static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
int stream = substream->stream;
int ret = 0;
enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
switch (trigger) {
case SND_SOC_DPCM_TRIGGER_PRE:
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_DRAIN:
ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
break;
default:
ret = -EINVAL;
break;
}
break;
case SND_SOC_DPCM_TRIGGER_POST:
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_DRAIN:
ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
break;
default:
ret = -EINVAL;
break;
}
break;
case SND_SOC_DPCM_TRIGGER_BESPOKE:
/* bespoke trigger() - handles both FE and BEs */
dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
fe->dai_link->name, cmd);
ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
break;
default:
dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
fe->dai_link->name);
ret = -EINVAL;
goto out;
}
if (ret < 0) {
dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
cmd, ret);
goto out;
}
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
break;
}
out:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
return ret;
}
static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
int stream = substream->stream;
/* if FE's runtime_update is already set, we're in race;
* process this trigger later at exit
*/
if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
fe->dpcm[stream].trigger_pending = cmd + 1;
return 0; /* delayed, assuming it's successful */
}
/* we're alone, let's trigger */
return dpcm_fe_dai_do_trigger(substream, cmd);
}
int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
int ret = 0;
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *be_substream =
snd_soc_dpcm_get_substream(be, stream);
/* is this op for this BE ? */
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
continue;
dev_dbg(be->dev, "ASoC: prepare BE %s\n",
be->dai_link->name);
ret = __soc_pcm_prepare(be, be_substream);
if (ret < 0)
break;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
}
if (ret < 0)
dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
return ret;
}
static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
int stream = substream->stream, ret = 0;
snd_soc_dpcm_mutex_lock(fe);
dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
/* there is no point preparing this FE if there are no BEs */
if (list_empty(&fe->dpcm[stream].be_clients)) {
dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
fe->dai_link->name);
ret = -EINVAL;
goto out;
}
ret = dpcm_be_dai_prepare(fe, stream);
if (ret < 0)
goto out;
/* call prepare on the frontend */
ret = __soc_pcm_prepare(fe, substream);
if (ret < 0)
goto out;
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
out:
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
snd_soc_dpcm_mutex_unlock(fe);
if (ret < 0)
dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
return ret;
}
static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_pcm_substream *substream =
snd_soc_dpcm_get_substream(fe, stream);
enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
int err;
dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
stream ? "capture" : "playback", fe->dai_link->name);
if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
/* call bespoke trigger - FE takes care of all BE triggers */
dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
fe->dai_link->name);
err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
} else {
dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
fe->dai_link->name);
err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
}
dpcm_be_dai_hw_free(fe, stream);
dpcm_be_dai_shutdown(fe, stream);
/* run the stream event for each BE */
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
if (err < 0)
dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, err);
return err;
}
static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_pcm_substream *substream =
snd_soc_dpcm_get_substream(fe, stream);
struct snd_soc_dpcm *dpcm;
enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
int ret = 0;
dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
stream ? "capture" : "playback", fe->dai_link->name);
/* Only start the BE if the FE is ready */
if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
fe->dai_link->name, fe->dpcm[stream].state);
ret = -EINVAL;
goto disconnect;
}
/* startup must always be called for new BEs */
ret = dpcm_be_dai_startup(fe, stream);
if (ret < 0)
goto disconnect;
/* keep going if FE state is > open */
if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
return 0;
ret = dpcm_be_dai_hw_params(fe, stream);
if (ret < 0)
goto close;
/* keep going if FE state is > hw_params */
if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
return 0;
ret = dpcm_be_dai_prepare(fe, stream);
if (ret < 0)
goto hw_free;
/* run the stream event for each BE */
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
/* keep going if FE state is > prepare */
if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
return 0;
if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
/* call trigger on the frontend - FE takes care of all BE triggers */
dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
fe->dai_link->name);
ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
if (ret < 0)
goto hw_free;
} else {
dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
fe->dai_link->name);
ret = dpcm_be_dai_trigger(fe, stream,
SNDRV_PCM_TRIGGER_START);
if (ret < 0)
goto hw_free;
}
return 0;
hw_free:
dpcm_be_dai_hw_free(fe, stream);
close:
dpcm_be_dai_shutdown(fe, stream);
disconnect:
/* disconnect any pending BEs */
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
/* is this op for this BE ? */
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
}
if (ret < 0)
dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
return ret;
}
static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
{
struct snd_soc_dapm_widget_list *list;
int stream;
int count, paths;
if (!fe->dai_link->dynamic)
return 0;
if (fe->num_cpus > 1) {
dev_err(fe->dev,
"%s doesn't support Multi CPU yet\n", __func__);
return -EINVAL;
}
/* only check active links */
if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
return 0;
/* DAPM sync will call this to update DSP paths */
dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
new ? "new" : "old", fe->dai_link->name);
for_each_pcm_streams(stream) {
/* skip if FE doesn't have playback/capture capability */
if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream) ||
!snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
continue;
/* skip if FE isn't currently playing/capturing */
if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
!snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
continue;
paths = dpcm_path_get(fe, stream, &list);
if (paths < 0)
return paths;
/* update any playback/capture paths */
count = dpcm_process_paths(fe, stream, &list, new);
if (count) {
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
if (new)
dpcm_run_update_startup(fe, stream);
else
dpcm_run_update_shutdown(fe, stream);
dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
dpcm_clear_pending_state(fe, stream);
dpcm_be_disconnect(fe, stream);
}
dpcm_path_put(&list);
}
return 0;
}
/* Called by DAPM mixer/mux changes to update audio routing between PCMs and
* any DAI links.
*/
int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
{
struct snd_soc_pcm_runtime *fe;
int ret = 0;
mutex_lock_nested(&card->pcm_mutex, card->pcm_subclass);
/* shutdown all old paths first */
for_each_card_rtds(card, fe) {
ret = soc_dpcm_fe_runtime_update(fe, 0);
if (ret)
goto out;
}
/* bring new paths up */
for_each_card_rtds(card, fe) {
ret = soc_dpcm_fe_runtime_update(fe, 1);
if (ret)
goto out;
}
out:
mutex_unlock(&card->pcm_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
struct snd_soc_dpcm *dpcm;
int stream = fe_substream->stream;
snd_soc_dpcm_mutex_assert_held(fe);
/* mark FE's links ready to prune */
for_each_dpcm_be(fe, stream, dpcm)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
dpcm_be_disconnect(fe, stream);
fe->dpcm[stream].runtime = NULL;
}
static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
int ret;
snd_soc_dpcm_mutex_lock(fe);
ret = dpcm_fe_dai_shutdown(fe_substream);
dpcm_fe_dai_cleanup(fe_substream);
snd_soc_dpcm_mutex_unlock(fe);
return ret;
}
static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
struct snd_soc_dapm_widget_list *list;
int ret;
int stream = fe_substream->stream;
snd_soc_dpcm_mutex_lock(fe);
fe->dpcm[stream].runtime = fe_substream->runtime;
ret = dpcm_path_get(fe, stream, &list);
if (ret < 0)
goto open_end;
/* calculate valid and active FE <-> BE dpcms */
dpcm_process_paths(fe, stream, &list, 1);
ret = dpcm_fe_dai_startup(fe_substream);
if (ret < 0)
dpcm_fe_dai_cleanup(fe_substream);
dpcm_clear_pending_state(fe, stream);
dpcm_path_put(&list);
open_end:
snd_soc_dpcm_mutex_unlock(fe);
return ret;
}
static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
int *playback, int *capture)
{
struct snd_soc_dai *cpu_dai;
int i;
if (rtd->dai_link->dynamic && rtd->num_cpus > 1) {
dev_err(rtd->dev,
"DPCM doesn't support Multi CPU for Front-Ends yet\n");
return -EINVAL;
}
if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
int stream;
if (rtd->dai_link->dpcm_playback) {
stream = SNDRV_PCM_STREAM_PLAYBACK;
for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
*playback = 1;
break;
}
}
if (!*playback) {
dev_err(rtd->card->dev,
"No CPU DAIs support playback for stream %s\n",
rtd->dai_link->stream_name);
return -EINVAL;
}
}
if (rtd->dai_link->dpcm_capture) {
stream = SNDRV_PCM_STREAM_CAPTURE;
for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
*capture = 1;
break;
}
}
if (!*capture) {
dev_err(rtd->card->dev,
"No CPU DAIs support capture for stream %s\n",
rtd->dai_link->stream_name);
return -EINVAL;
}
}
} else {
struct snd_soc_dai *codec_dai;
/* Adapt stream for codec2codec links */
int cpu_capture = rtd->dai_link->params ?
SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
int cpu_playback = rtd->dai_link->params ?
SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
for_each_rtd_codec_dais(rtd, i, codec_dai) {
if (rtd->num_cpus == 1) {
cpu_dai = asoc_rtd_to_cpu(rtd, 0);
} else if (rtd->num_cpus == rtd->num_codecs) {
cpu_dai = asoc_rtd_to_cpu(rtd, i);
} else {
dev_err(rtd->card->dev,
"N cpus to M codecs link is not supported yet\n");
return -EINVAL;
}
if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
snd_soc_dai_stream_valid(cpu_dai, cpu_playback))
*playback = 1;
if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
snd_soc_dai_stream_valid(cpu_dai, cpu_capture))
*capture = 1;
}
}
if (rtd->dai_link->playback_only) {
*playback = 1;
*capture = 0;
}
if (rtd->dai_link->capture_only) {
*playback = 0;
*capture = 1;
}
return 0;
}
static int soc_create_pcm(struct snd_pcm **pcm,
struct snd_soc_pcm_runtime *rtd,
int playback, int capture, int num)
{
char new_name[64];
int ret;
/* create the PCM */
if (rtd->dai_link->params) {
snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
rtd->dai_link->stream_name);
ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
playback, capture, pcm);
} else if (rtd->dai_link->no_pcm) {
snprintf(new_name, sizeof(new_name), "(%s)",
rtd->dai_link->stream_name);
ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
playback, capture, pcm);
} else {
if (rtd->dai_link->dynamic)
snprintf(new_name, sizeof(new_name), "%s (*)",
rtd->dai_link->stream_name);
else
snprintf(new_name, sizeof(new_name), "%s %s-%d",
rtd->dai_link->stream_name,
soc_codec_dai_name(rtd), num);
ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
capture, pcm);
}
if (ret < 0) {
dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
new_name, rtd->dai_link->name, ret);
return ret;
}
dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
return 0;
}
/* create a new pcm */
int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
{
struct snd_soc_component *component;
struct snd_pcm *pcm;
int ret = 0, playback = 0, capture = 0;
int i;
ret = soc_get_playback_capture(rtd, &playback, &capture);
if (ret < 0)
return ret;
ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
if (ret < 0)
return ret;
/* DAPM dai link stream work */
if (rtd->dai_link->params)
rtd->close_delayed_work_func = codec2codec_close_delayed_work;
else
rtd->close_delayed_work_func = snd_soc_close_delayed_work;
rtd->pcm = pcm;
pcm->nonatomic = rtd->dai_link->nonatomic;
pcm->private_data = rtd;
if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
if (playback)
pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
if (capture)
pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
goto out;
}
/* ASoC PCM operations */
if (rtd->dai_link->dynamic) {
rtd->ops.open = dpcm_fe_dai_open;
rtd->ops.hw_params = dpcm_fe_dai_hw_params;
rtd->ops.prepare = dpcm_fe_dai_prepare;
rtd->ops.trigger = dpcm_fe_dai_trigger;
rtd->ops.hw_free = dpcm_fe_dai_hw_free;
rtd->ops.close = dpcm_fe_dai_close;
rtd->ops.pointer = soc_pcm_pointer;
} else {
rtd->ops.open = soc_pcm_open;
rtd->ops.hw_params = soc_pcm_hw_params;
rtd->ops.prepare = soc_pcm_prepare;
rtd->ops.trigger = soc_pcm_trigger;
rtd->ops.hw_free = soc_pcm_hw_free;
rtd->ops.close = soc_pcm_close;
rtd->ops.pointer = soc_pcm_pointer;
}
for_each_rtd_components(rtd, i, component) {
const struct snd_soc_component_driver *drv = component->driver;
if (drv->ioctl)
rtd->ops.ioctl = snd_soc_pcm_component_ioctl;
if (drv->sync_stop)
rtd->ops.sync_stop = snd_soc_pcm_component_sync_stop;
if (drv->copy_user)
rtd->ops.copy_user = snd_soc_pcm_component_copy_user;
if (drv->page)
rtd->ops.page = snd_soc_pcm_component_page;
if (drv->mmap)
rtd->ops.mmap = snd_soc_pcm_component_mmap;
if (drv->ack)
rtd->ops.ack = snd_soc_pcm_component_ack;
}
if (playback)
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
if (capture)
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
ret = snd_soc_pcm_component_new(rtd);
if (ret < 0)
return ret;
pcm->no_device_suspend = true;
out:
dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
return ret;
}
/* is the current PCM operation for this FE ? */
int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
{
if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
return 1;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
/* is the current PCM operation for this BE ? */
int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
be->dpcm[stream].runtime_update))
return 1;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
/* get the substream for this BE */
struct snd_pcm_substream *
snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
{
return be->pcm->streams[stream].substream;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be,
int stream,
const enum snd_soc_dpcm_state *states,
int num_states)
{
struct snd_soc_dpcm *dpcm;
int state;
int ret = 1;
int i;
for_each_dpcm_fe(be, stream, dpcm) {
if (dpcm->fe == fe)
continue;
state = dpcm->fe->dpcm[stream].state;
for (i = 0; i < num_states; i++) {
if (state == states[i]) {
ret = 0;
break;
}
}
}
/* it's safe to do this BE DAI */
return ret;
}
/*
* We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
* are not running, paused or suspended for the specified stream direction.
*/
int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
const enum snd_soc_dpcm_state state[] = {
SND_SOC_DPCM_STATE_START,
SND_SOC_DPCM_STATE_PAUSED,
SND_SOC_DPCM_STATE_SUSPEND,
};
return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
/*
* We can only change hw params a BE DAI if any of it's FE are not prepared,
* running, paused or suspended for the specified stream direction.
*/
int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
const enum snd_soc_dpcm_state state[] = {
SND_SOC_DPCM_STATE_START,
SND_SOC_DPCM_STATE_PAUSED,
SND_SOC_DPCM_STATE_SUSPEND,
SND_SOC_DPCM_STATE_PREPARE,
};
return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
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