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07bf84aaf7
linux/sound/soc/soc-pcm.c
Liam Girdwood 07bf84aaf7 ASoC: dpcm: Add bespoke trigger() 
Some on SoC DSP HW is very tightly coupled with DMA and DAI drivers. It's
necessary to allow some flexability wrt to PCM operations here so that we
can define a bespoke DPCM trigger() PCM operation for such HW.

A bespoke DPCM trigger() allows exact ordering and timing of component
triggering by allowing a component driver to manage the final enable
and disable configurations without adding extra complexity to other
component drivers. e.g. The McPDM DAI and ABE are tightly coupled on
OMAP4 so we have a bespoke trigger to manage the trigger to improve
performance and reduce complexity when triggering new McPDM BEs.

Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-04-26 17:48:42 +01:00

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/*
* 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>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.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/initval.h>
#define DPCM_MAX_BE_USERS 8
/* DPCM stream event, send event to FE and all active BEs. */
static int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
int event)
{
struct snd_soc_dpcm *dpcm;
list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
dev_dbg(be->dev, "pm: BE %s event %d dir %d\n",
be->dai_link->name, event, dir);
snd_soc_dapm_stream_event(be, dir, event);
}
snd_soc_dapm_stream_event(fe, dir, event);
return 0;
}
static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
struct snd_soc_dai *soc_dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
int ret;
if (!soc_dai->driver->symmetric_rates &&
!rtd->dai_link->symmetric_rates)
return 0;
/* This can happen if multiple streams are starting simultaneously -
* the second can need to get its constraints before the first has
* picked a rate. Complain and allow the application to carry on.
*/
if (!soc_dai->rate) {
dev_warn(soc_dai->dev,
"Not enforcing symmetric_rates due to race\n");
return 0;
}
dev_dbg(soc_dai->dev, "Symmetry forces %dHz rate\n", soc_dai->rate);
ret = snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_RATE,
soc_dai->rate, soc_dai->rate);
if (ret < 0) {
dev_err(soc_dai->dev,
"Unable to apply rate symmetry constraint: %d\n", ret);
return ret;
}
return 0;
}
/*
* List of sample sizes that might go over the bus for parameter
* application. There ought to be a wildcard sample size for things
* like the DAC/ADC resolution to use but there isn't right now.
*/
static int sample_sizes[] = {
24, 32,
};
static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
int ret, i, bits;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
bits = dai->driver->playback.sig_bits;
else
bits = dai->driver->capture.sig_bits;
if (!bits)
return;
for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
if (bits >= sample_sizes[i])
continue;
ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
sample_sizes[i], bits);
if (ret != 0)
dev_warn(dai->dev,
"Failed to set MSB %d/%d: %d\n",
bits, sample_sizes[i], ret);
}
}
/*
* 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, platform, machine and codec DAI.
*/
static int soc_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
int ret = 0;
pm_runtime_get_sync(cpu_dai->dev);
pm_runtime_get_sync(codec_dai->dev);
pm_runtime_get_sync(platform->dev);
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
/* startup the audio subsystem */
if (cpu_dai->driver->ops->startup) {
ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
if (ret < 0) {
dev_err(cpu_dai->dev, "can't open interface %s: %d\n",
cpu_dai->name, ret);
goto out;
}
}
if (platform->driver->ops && platform->driver->ops->open) {
ret = platform->driver->ops->open(substream);
if (ret < 0) {
dev_err(platform->dev, "can't open platform %s: %d\n",
platform->name, ret);
goto platform_err;
}
}
if (codec_dai->driver->ops->startup) {
ret = codec_dai->driver->ops->startup(substream, codec_dai);
if (ret < 0) {
dev_err(codec_dai->dev, "can't open codec %s: %d\n",
codec_dai->name, ret);
goto codec_dai_err;
}
}
if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
ret = rtd->dai_link->ops->startup(substream);
if (ret < 0) {
pr_err("asoc: %s startup failed: %d\n",
rtd->dai_link->name, ret);
goto machine_err;
}
}
/* 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 */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
runtime->hw.rate_min =
max(codec_dai_drv->playback.rate_min,
cpu_dai_drv->playback.rate_min);
runtime->hw.rate_max =
min(codec_dai_drv->playback.rate_max,
cpu_dai_drv->playback.rate_max);
runtime->hw.channels_min =
max(codec_dai_drv->playback.channels_min,
cpu_dai_drv->playback.channels_min);
runtime->hw.channels_max =
min(codec_dai_drv->playback.channels_max,
cpu_dai_drv->playback.channels_max);
runtime->hw.formats =
codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
runtime->hw.rates =
codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
if (codec_dai_drv->playback.rates
& (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
runtime->hw.rates |= cpu_dai_drv->playback.rates;
if (cpu_dai_drv->playback.rates
& (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
runtime->hw.rates |= codec_dai_drv->playback.rates;
} else {
runtime->hw.rate_min =
max(codec_dai_drv->capture.rate_min,
cpu_dai_drv->capture.rate_min);
runtime->hw.rate_max =
min(codec_dai_drv->capture.rate_max,
cpu_dai_drv->capture.rate_max);
runtime->hw.channels_min =
max(codec_dai_drv->capture.channels_min,
cpu_dai_drv->capture.channels_min);
runtime->hw.channels_max =
min(codec_dai_drv->capture.channels_max,
cpu_dai_drv->capture.channels_max);
runtime->hw.formats =
codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
runtime->hw.rates =
codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
if (codec_dai_drv->capture.rates
& (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
runtime->hw.rates |= cpu_dai_drv->capture.rates;
if (cpu_dai_drv->capture.rates
& (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
runtime->hw.rates |= codec_dai_drv->capture.rates;
}
ret = -EINVAL;
snd_pcm_limit_hw_rates(runtime);
if (!runtime->hw.rates) {
printk(KERN_ERR "asoc: %s <-> %s No matching rates\n",
codec_dai->name, cpu_dai->name);
goto config_err;
}
if (!runtime->hw.formats) {
printk(KERN_ERR "asoc: %s <-> %s No matching formats\n",
codec_dai->name, cpu_dai->name);
goto config_err;
}
if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
runtime->hw.channels_min > runtime->hw.channels_max) {
printk(KERN_ERR "asoc: %s <-> %s No matching channels\n",
codec_dai->name, cpu_dai->name);
goto config_err;
}
soc_pcm_apply_msb(substream, codec_dai);
soc_pcm_apply_msb(substream, cpu_dai);
/* Symmetry only applies if we've already got an active stream. */
if (cpu_dai->active) {
ret = soc_pcm_apply_symmetry(substream, cpu_dai);
if (ret != 0)
goto config_err;
}
if (codec_dai->active) {
ret = soc_pcm_apply_symmetry(substream, codec_dai);
if (ret != 0)
goto config_err;
}
pr_debug("asoc: %s <-> %s info:\n",
codec_dai->name, cpu_dai->name);
pr_debug("asoc: rate mask 0x%x\n", runtime->hw.rates);
pr_debug("asoc: min ch %d max ch %d\n", runtime->hw.channels_min,
runtime->hw.channels_max);
pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
runtime->hw.rate_max);
dynamic:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
cpu_dai->playback_active++;
codec_dai->playback_active++;
} else {
cpu_dai->capture_active++;
codec_dai->capture_active++;
}
cpu_dai->active++;
codec_dai->active++;
rtd->codec->active++;
mutex_unlock(&rtd->pcm_mutex);
return 0;
config_err:
if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
rtd->dai_link->ops->shutdown(substream);
machine_err:
if (codec_dai->driver->ops->shutdown)
codec_dai->driver->ops->shutdown(substream, codec_dai);
codec_dai_err:
if (platform->driver->ops && platform->driver->ops->close)
platform->driver->ops->close(substream);
platform_err:
if (cpu_dai->driver->ops->shutdown)
cpu_dai->driver->ops->shutdown(substream, cpu_dai);
out:
mutex_unlock(&rtd->pcm_mutex);
pm_runtime_put(platform->dev);
pm_runtime_put(codec_dai->dev);
pm_runtime_put(cpu_dai->dev);
return ret;
}
/*
* Power down the audio subsystem pmdown_time msecs after close is called.
* This is to ensure there are no pops or clicks in between any music tracks
* due to DAPM power cycling.
*/
static void close_delayed_work(struct work_struct *work)
{
struct snd_soc_pcm_runtime *rtd =
container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
struct snd_soc_dai *codec_dai = rtd->codec_dai;
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
pr_debug("pop wq checking: %s status: %s waiting: %s\n",
codec_dai->driver->playback.stream_name,
codec_dai->playback_active ? "active" : "inactive",
codec_dai->pop_wait ? "yes" : "no");
/* are we waiting on this codec DAI stream */
if (codec_dai->pop_wait == 1) {
codec_dai->pop_wait = 0;
snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK,
SND_SOC_DAPM_STREAM_STOP);
}
mutex_unlock(&rtd->pcm_mutex);
}
/*
* Called by ALSA when a PCM substream is closed. Private data can be
* freed here. The cpu DAI, codec DAI, machine and platform are also
* shutdown.
*/
static int soc_pcm_close(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_codec *codec = rtd->codec;
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
cpu_dai->playback_active--;
codec_dai->playback_active--;
} else {
cpu_dai->capture_active--;
codec_dai->capture_active--;
}
cpu_dai->active--;
codec_dai->active--;
codec->active--;
/* clear the corresponding DAIs rate when inactive */
if (!cpu_dai->active)
cpu_dai->rate = 0;
if (!codec_dai->active)
codec_dai->rate = 0;
/* Muting the DAC suppresses artifacts caused during digital
* shutdown, for example from stopping clocks.
*/
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
snd_soc_dai_digital_mute(codec_dai, 1);
if (cpu_dai->driver->ops->shutdown)
cpu_dai->driver->ops->shutdown(substream, cpu_dai);
if (codec_dai->driver->ops->shutdown)
codec_dai->driver->ops->shutdown(substream, codec_dai);
if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
rtd->dai_link->ops->shutdown(substream);
if (platform->driver->ops && platform->driver->ops->close)
platform->driver->ops->close(substream);
cpu_dai->runtime = NULL;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (!rtd->pmdown_time || codec->ignore_pmdown_time ||
rtd->dai_link->ignore_pmdown_time) {
/* powered down playback stream now */
snd_soc_dapm_stream_event(rtd,
SNDRV_PCM_STREAM_PLAYBACK,
SND_SOC_DAPM_STREAM_STOP);
} else {
/* start delayed pop wq here for playback streams */
codec_dai->pop_wait = 1;
schedule_delayed_work(&rtd->delayed_work,
msecs_to_jiffies(rtd->pmdown_time));
}
} else {
/* capture streams can be powered down now */
snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
SND_SOC_DAPM_STREAM_STOP);
}
mutex_unlock(&rtd->pcm_mutex);
pm_runtime_put(platform->dev);
pm_runtime_put(codec_dai->dev);
pm_runtime_put(cpu_dai->dev);
return 0;
}
/*
* 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_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
int ret = 0;
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
ret = rtd->dai_link->ops->prepare(substream);
if (ret < 0) {
pr_err("asoc: machine prepare error: %d\n", ret);
goto out;
}
}
if (platform->driver->ops && platform->driver->ops->prepare) {
ret = platform->driver->ops->prepare(substream);
if (ret < 0) {
dev_err(platform->dev, "platform prepare error: %d\n",
ret);
goto out;
}
}
if (codec_dai->driver->ops->prepare) {
ret = codec_dai->driver->ops->prepare(substream, codec_dai);
if (ret < 0) {
dev_err(codec_dai->dev, "DAI prepare error: %d\n",
ret);
goto out;
}
}
if (cpu_dai->driver->ops->prepare) {
ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
if (ret < 0) {
dev_err(cpu_dai->dev, "DAI prepare error: %d\n",
ret);
goto out;
}
}
/* cancel any delayed stream shutdown that is pending */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
codec_dai->pop_wait) {
codec_dai->pop_wait = 0;
cancel_delayed_work(&rtd->delayed_work);
}
snd_soc_dapm_stream_event(rtd, substream->stream,
SND_SOC_DAPM_STREAM_START);
snd_soc_dai_digital_mute(codec_dai, 0);
out:
mutex_unlock(&rtd->pcm_mutex);
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_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
int ret = 0;
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
ret = rtd->dai_link->ops->hw_params(substream, params);
if (ret < 0) {
pr_err("asoc: machine hw_params failed: %d\n", ret);
goto out;
}
}
if (codec_dai->driver->ops->hw_params) {
ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
if (ret < 0) {
dev_err(codec_dai->dev, "can't set %s hw params: %d\n",
codec_dai->name, ret);
goto codec_err;
}
}
if (cpu_dai->driver->ops->hw_params) {
ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
if (ret < 0) {
dev_err(cpu_dai->dev, "%s hw params failed: %d\n",
cpu_dai->name, ret);
goto interface_err;
}
}
if (platform->driver->ops && platform->driver->ops->hw_params) {
ret = platform->driver->ops->hw_params(substream, params);
if (ret < 0) {
dev_err(platform->dev, "%s hw params failed: %d\n",
platform->name, ret);
goto platform_err;
}
}
/* store the rate for each DAIs */
cpu_dai->rate = params_rate(params);
codec_dai->rate = params_rate(params);
out:
mutex_unlock(&rtd->pcm_mutex);
return ret;
platform_err:
if (cpu_dai->driver->ops->hw_free)
cpu_dai->driver->ops->hw_free(substream, cpu_dai);
interface_err:
if (codec_dai->driver->ops->hw_free)
codec_dai->driver->ops->hw_free(substream, codec_dai);
codec_err:
if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
rtd->dai_link->ops->hw_free(substream);
mutex_unlock(&rtd->pcm_mutex);
return ret;
}
/*
* Frees resources allocated by hw_params, can be called multiple times
*/
static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_codec *codec = rtd->codec;
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
/* apply codec digital mute */
if (!codec->active)
snd_soc_dai_digital_mute(codec_dai, 1);
/* free any machine hw params */
if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
rtd->dai_link->ops->hw_free(substream);
/* free any DMA resources */
if (platform->driver->ops && platform->driver->ops->hw_free)
platform->driver->ops->hw_free(substream);
/* now free hw params for the DAIs */
if (codec_dai->driver->ops->hw_free)
codec_dai->driver->ops->hw_free(substream, codec_dai);
if (cpu_dai->driver->ops->hw_free)
cpu_dai->driver->ops->hw_free(substream, cpu_dai);
mutex_unlock(&rtd->pcm_mutex);
return 0;
}
static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
int ret;
if (codec_dai->driver->ops->trigger) {
ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
if (ret < 0)
return ret;
}
if (platform->driver->ops && platform->driver->ops->trigger) {
ret = platform->driver->ops->trigger(substream, cmd);
if (ret < 0)
return ret;
}
if (cpu_dai->driver->ops->trigger) {
ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
if (ret < 0)
return ret;
}
return 0;
}
int soc_pcm_bespoke_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
int ret;
if (codec_dai->driver->ops->bespoke_trigger) {
ret = codec_dai->driver->ops->bespoke_trigger(substream, cmd, codec_dai);
if (ret < 0)
return ret;
}
if (platform->driver->bespoke_trigger) {
ret = platform->driver->bespoke_trigger(substream, cmd);
if (ret < 0)
return ret;
}
if (cpu_dai->driver->ops->bespoke_trigger) {
ret = cpu_dai->driver->ops->bespoke_trigger(substream, cmd, cpu_dai);
if (ret < 0)
return ret;
}
return 0;
}
/*
* soc level wrapper for pointer callback
* If cpu_dai, codec_dai, platform driver has the delay callback, than
* the runtime->delay will be updated accordingly.
*/
static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t offset = 0;
snd_pcm_sframes_t delay = 0;
if (platform->driver->ops && platform->driver->ops->pointer)
offset = platform->driver->ops->pointer(substream);
if (cpu_dai->driver->ops->delay)
delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
if (codec_dai->driver->ops->delay)
delay += codec_dai->driver->ops->delay(substream, codec_dai);
if (platform->driver->delay)
delay += platform->driver->delay(substream, codec_dai);
runtime->delay = 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_soc_dpcm *dpcm;
/* only add new dpcms */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
if (dpcm->be == be && dpcm->fe == fe)
return 0;
}
dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
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;
list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
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);
#ifdef CONFIG_DEBUG_FS
dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
fe->debugfs_dpcm_root, &dpcm->state);
#endif
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);
list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
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 */
static void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm, *d;
list_for_each_entry_safe(dpcm, d, &fe->dpcm[stream].be_clients, list_be) {
dev_dbg(fe->dev, "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);
#ifdef CONFIG_DEBUG_FS
debugfs_remove(dpcm->debugfs_state);
#endif
list_del(&dpcm->list_be);
list_del(&dpcm->list_fe);
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;
int i;
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
for (i = 0; i < card->num_links; i++) {
be = &card->rtd[i];
if (be->cpu_dai->playback_widget == widget ||
be->codec_dai->playback_widget == widget)
return be;
}
} else {
for (i = 0; i < card->num_links; i++) {
be = &card->rtd[i];
if (be->cpu_dai->capture_widget == widget ||
be->codec_dai->capture_widget == widget)
return be;
}
}
dev_err(card->dev, "can't get %s BE for %s\n",
stream ? "capture" : "playback", widget->name);
return NULL;
}
static inline struct snd_soc_dapm_widget *
rtd_get_cpu_widget(struct snd_soc_pcm_runtime *rtd, int stream)
{
if (stream == SNDRV_PCM_STREAM_PLAYBACK)
return rtd->cpu_dai->playback_widget;
else
return rtd->cpu_dai->capture_widget;
}
static inline struct snd_soc_dapm_widget *
rtd_get_codec_widget(struct snd_soc_pcm_runtime *rtd, int stream)
{
if (stream == SNDRV_PCM_STREAM_PLAYBACK)
return rtd->codec_dai->playback_widget;
else
return rtd->codec_dai->capture_widget;
}
static int widget_in_list(struct snd_soc_dapm_widget_list *list,
struct snd_soc_dapm_widget *widget)
{
int i;
for (i = 0; i < list->num_widgets; i++) {
if (widget == list->widgets[i])
return 1;
}
return 0;
}
static 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 = fe->cpu_dai;
struct snd_soc_dapm_widget_list *list;
int paths;
list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
if (list == NULL)
return -ENOMEM;
/* get number of valid DAI paths and their widgets */
paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
dev_dbg(fe->dev, "found %d audio %s paths\n", paths,
stream ? "capture" : "playback");
*list_ = list;
return paths;
}
static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
{
kfree(*list);
}
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;
struct snd_soc_dapm_widget_list *list = *list_;
struct snd_soc_dapm_widget *widget;
int prune = 0;
/* Destroy any old FE <--> BE connections */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
/* is there a valid CPU DAI widget for this BE */
widget = rtd_get_cpu_widget(dpcm->be, stream);
/* prune the BE if it's no longer in our active list */
if (widget && widget_in_list(list, widget))
continue;
/* is there a valid CODEC DAI widget for this BE */
widget = rtd_get_codec_widget(dpcm->be, stream);
/* prune the BE if it's no longer in our active list */
if (widget && widget_in_list(list, widget))
continue;
dev_dbg(fe->dev, "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->be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
prune++;
}
dev_dbg(fe->dev, "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;
int i, new = 0, err;
/* Create any new FE <--> BE connections */
for (i = 0; i < list->num_widgets; i++) {
if (list->widgets[i]->id != snd_soc_dapm_dai)
continue;
/* is there a valid BE rtd for this widget */
be = dpcm_get_be(card, list->widgets[i], stream);
if (!be) {
dev_err(fe->dev, "no BE found for %s\n",
list->widgets[i]->name);
continue;
}
/* make sure BE is a real BE */
if (!be->dai_link->no_pcm)
continue;
/* don't connect if FE is not running */
if (!fe->dpcm[stream].runtime)
continue;
/* newly connected FE and BE */
err = dpcm_be_connect(fe, be, stream);
if (err < 0) {
dev_err(fe->dev, "can't connect %s\n",
list->widgets[i]->name);
break;
} else if (err == 0) /* already connected */
continue;
/* new */
be->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
new++;
}
dev_dbg(fe->dev, "found %d new BE paths\n", new);
return new;
}
/*
* Find the corresponding BE DAIs that source or sink audio to this
* FE substream.
*/
static 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);
}
static void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
dpcm->be->dpcm[stream].runtime_update =
SND_SOC_DPCM_UPDATE_NO;
}
static void dpcm_be_dai_startup_unwind(struct snd_soc_pcm_runtime *fe,
int stream)
{
struct snd_soc_dpcm *dpcm;
/* disable any enabled and non active backends */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *be_substream =
snd_soc_dpcm_get_substream(be, stream);
if (be->dpcm[stream].users == 0)
dev_err(be->dev, "no users %s at close - state %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
if (--be->dpcm[stream].users != 0)
continue;
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
continue;
soc_pcm_close(be_substream);
be_substream->runtime = NULL;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
}
}
static int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
int err, count = 0;
/* only startup BE DAIs that are either sinks or sources to this FE DAI */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
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;
/* first time the dpcm is open ? */
if (be->dpcm[stream].users == DPCM_MAX_BE_USERS)
dev_err(be->dev, "too many users %s at open %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
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, "dpcm: open BE %s\n", be->dai_link->name);
be_substream->runtime = be->dpcm[stream].runtime;
err = soc_pcm_open(be_substream);
if (err < 0) {
dev_err(be->dev, "BE open failed %d\n", err);
be->dpcm[stream].users--;
if (be->dpcm[stream].users < 0)
dev_err(be->dev, "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].state = SND_SOC_DPCM_STATE_OPEN;
count++;
}
return count;
unwind:
/* disable any enabled and non active backends */
list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *be_substream =
snd_soc_dpcm_get_substream(be, stream);
if (!snd_soc_dpcm_be_can_update(fe, be, stream))
continue;
if (be->dpcm[stream].users == 0)
dev_err(be->dev, "no users %s at close %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
if (--be->dpcm[stream].users != 0)
continue;
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN)
continue;
soc_pcm_close(be_substream);
be_substream->runtime = NULL;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
}
return err;
}
void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
runtime->hw.rate_min = cpu_dai_drv->playback.rate_min;
runtime->hw.rate_max = cpu_dai_drv->playback.rate_max;
runtime->hw.channels_min = cpu_dai_drv->playback.channels_min;
runtime->hw.channels_max = cpu_dai_drv->playback.channels_max;
runtime->hw.formats &= cpu_dai_drv->playback.formats;
runtime->hw.rates = cpu_dai_drv->playback.rates;
} else {
runtime->hw.rate_min = cpu_dai_drv->capture.rate_min;
runtime->hw.rate_max = cpu_dai_drv->capture.rate_max;
runtime->hw.channels_min = cpu_dai_drv->capture.channels_min;
runtime->hw.channels_max = cpu_dai_drv->capture.channels_max;
runtime->hw.formats &= cpu_dai_drv->capture.formats;
runtime->hw.rates = cpu_dai_drv->capture.rates;
}
}
static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
struct snd_pcm_runtime *runtime = fe_substream->runtime;
int stream = fe_substream->stream, ret = 0;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
ret = dpcm_be_dai_startup(fe, fe_substream->stream);
if (ret < 0) {
dev_err(fe->dev,"dpcm: failed to start some BEs %d\n", ret);
goto be_err;
}
dev_dbg(fe->dev, "dpcm: open FE %s\n", fe->dai_link->name);
/* start the DAI frontend */
ret = soc_pcm_open(fe_substream);
if (ret < 0) {
dev_err(fe->dev,"dpcm: failed to start FE %d\n", ret);
goto unwind;
}
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
dpcm_set_fe_runtime(fe_substream);
snd_pcm_limit_hw_rates(runtime);
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
return 0;
unwind:
dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
be_err:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
return ret;
}
static int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
/* only shutdown BEs that are either sinks or sources to this FE DAI */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
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].users == 0)
dev_err(be->dev, "no users %s at close - state %d\n",
stream ? "capture" : "playback",
be->dpcm[stream].state);
if (--be->dpcm[stream].users != 0)
continue;
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN))
continue;
dev_dbg(be->dev, "dpcm: close BE %s\n",
dpcm->fe->dai_link->name);
soc_pcm_close(be_substream);
be_substream->runtime = NULL;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
}
return 0;
}
static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = substream->private_data;
int stream = substream->stream;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
/* shutdown the BEs */
dpcm_be_dai_shutdown(fe, substream->stream);
dev_dbg(fe->dev, "dpcm: close FE %s\n", fe->dai_link->name);
/* now shutdown the frontend */
soc_pcm_close(substream);
/* run the stream event for each BE */
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
return 0;
}
static int 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 */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
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;
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_STOP))
continue;
dev_dbg(be->dev, "dpcm: hw_free BE %s\n",
dpcm->fe->dai_link->name);
soc_pcm_hw_free(be_substream);
be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
}
return 0;
}
int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = substream->private_data;
int err, stream = substream->stream;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
dev_dbg(fe->dev, "dpcm: hw_free FE %s\n", fe->dai_link->name);
/* call hw_free on the frontend */
err = soc_pcm_hw_free(substream);
if (err < 0)
dev_err(fe->dev,"dpcm: hw_free FE %s failed\n",
fe->dai_link->name);
/* only hw_params backends that are either sinks or sources
* to this frontend DAI */
err = dpcm_be_dai_hw_free(fe, stream);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_unlock(&fe->card->mutex);
return 0;
}
static int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
int ret;
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
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 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, "dpcm: hw_params BE %s\n",
dpcm->fe->dai_link->name);
/* 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 */
if (be->dai_link->be_hw_params_fixup) {
ret = be->dai_link->be_hw_params_fixup(be,
&dpcm->hw_params);
if (ret < 0) {
dev_err(be->dev,
"dpcm: hw_params BE fixup failed %d\n",
ret);
goto unwind;
}
}
ret = soc_pcm_hw_params(be_substream, &dpcm->hw_params);
if (ret < 0) {
dev_err(dpcm->be->dev,
"dpcm: hw_params BE failed %d\n", ret);
goto unwind;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
}
return 0;
unwind:
/* disable any enabled and non active backends */
list_for_each_entry_continue_reverse(dpcm, &fe->dpcm[stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *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_substream);
}
return ret;
}
int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *fe = substream->private_data;
int ret, stream = substream->stream;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
memcpy(&fe->dpcm[substream->stream].hw_params, params,
sizeof(struct snd_pcm_hw_params));
ret = dpcm_be_dai_hw_params(fe, substream->stream);
if (ret < 0) {
dev_err(fe->dev,"dpcm: hw_params BE failed %d\n", ret);
goto out;
}
dev_dbg(fe->dev, "dpcm: 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(substream, params);
if (ret < 0) {
dev_err(fe->dev,"dpcm: hw_params FE failed %d\n", ret);
dpcm_be_dai_hw_free(fe, stream);
} else
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
out:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_unlock(&fe->card->mutex);
return ret;
}
static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
struct snd_pcm_substream *substream, int cmd)
{
int ret;
dev_dbg(dpcm->be->dev, "dpcm: trigger BE %s cmd %d\n",
dpcm->fe->dai_link->name, cmd);
ret = soc_pcm_trigger(substream, cmd);
if (ret < 0)
dev_err(dpcm->be->dev,"dpcm: trigger BE failed %d\n", ret);
return ret;
}
int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, int cmd)
{
struct snd_soc_dpcm *dpcm;
int ret = 0;
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
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;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
return ret;
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))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
return ret;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
return ret;
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)
continue;
if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
return ret;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)
continue;
if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
return ret;
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)
continue;
if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
return ret;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
break;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *fe = substream->private_data;
int stream = substream->stream, ret;
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:
/* call trigger on the frontend before the backend. */
dev_dbg(fe->dev, "dpcm: pre trigger FE %s cmd %d\n",
fe->dai_link->name, cmd);
ret = soc_pcm_trigger(substream, cmd);
if (ret < 0) {
dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
goto out;
}
ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
break;
case SND_SOC_DPCM_TRIGGER_POST:
/* call trigger on the frontend after the backend. */
ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
if (ret < 0) {
dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
goto out;
}
dev_dbg(fe->dev, "dpcm: post trigger FE %s cmd %d\n",
fe->dai_link->name, cmd);
ret = soc_pcm_trigger(substream, cmd);
break;
case SND_SOC_DPCM_TRIGGER_BESPOKE:
/* bespoke trigger() - handles both FE and BEs */
dev_dbg(fe->dev, "dpcm: bespoke trigger FE %s cmd %d\n",
fe->dai_link->name, cmd);
ret = soc_pcm_bespoke_trigger(substream, cmd);
if (ret < 0) {
dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
goto out;
}
break;
default:
dev_err(fe->dev, "dpcm: invalid trigger cmd %d for %s\n", cmd,
fe->dai_link->name);
ret = -EINVAL;
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:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
}
out:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
return ret;
}
static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
int ret = 0;
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
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))
continue;
dev_dbg(be->dev, "dpcm: prepare BE %s\n",
dpcm->fe->dai_link->name);
ret = soc_pcm_prepare(be_substream);
if (ret < 0) {
dev_err(be->dev, "dpcm: backend prepare failed %d\n",
ret);
break;
}
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
}
return ret;
}
int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *fe = substream->private_data;
int stream = substream->stream, ret = 0;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
dev_dbg(fe->dev, "dpcm: prepare FE %s\n", fe->dai_link->name);
fe->dpcm[stream].runtime_update = 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, "dpcm: no backend DAIs enabled for %s\n",
fe->dai_link->name);
ret = -EINVAL;
goto out;
}
ret = dpcm_be_dai_prepare(fe, substream->stream);
if (ret < 0)
goto out;
/* call prepare on the frontend */
ret = soc_pcm_prepare(substream);
if (ret < 0) {
dev_err(fe->dev,"dpcm: prepare FE %s failed\n",
fe->dai_link->name);
goto out;
}
/* run the stream event for each BE */
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
out:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_unlock(&fe->card->mutex);
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, "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, "dpcm: bespoke trigger FE %s cmd stop\n",
fe->dai_link->name);
err = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
if (err < 0)
dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
} else {
dev_dbg(fe->dev, "dpcm: trigger FE %s cmd stop\n",
fe->dai_link->name);
err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
if (err < 0)
dev_err(fe->dev,"dpcm: trigger FE failed %d\n", err);
}
err = dpcm_be_dai_hw_free(fe, stream);
if (err < 0)
dev_err(fe->dev,"dpcm: hw_free FE failed %d\n", err);
err = dpcm_be_dai_shutdown(fe, stream);
if (err < 0)
dev_err(fe->dev,"dpcm: shutdown FE failed %d\n", err);
/* run the stream event for each BE */
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
return 0;
}
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;
dev_dbg(fe->dev, "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)
return -EINVAL;
/* startup must always be called for new BEs */
ret = dpcm_be_dai_startup(fe, stream);
if (ret < 0) {
goto disconnect;
return ret;
}
/* 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;
return ret;
}
/* 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;
return ret;
}
/* 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, "dpcm: bespoke trigger FE %s cmd start\n",
fe->dai_link->name);
ret = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
if (ret < 0) {
dev_err(fe->dev,"dpcm: bespoke trigger FE failed %d\n", ret);
goto hw_free;
}
} else {
dev_dbg(fe->dev, "dpcm: trigger FE %s cmd start\n",
fe->dai_link->name);
ret = dpcm_be_dai_trigger(fe, stream,
SNDRV_PCM_TRIGGER_START);
if (ret < 0) {
dev_err(fe->dev,"dpcm: trigger FE failed %d\n", ret);
goto hw_free;
}
}
return 0;
hw_free:
dpcm_be_dai_hw_free(fe, stream);
close:
dpcm_be_dai_shutdown(fe, stream);
disconnect:
/* disconnect any non started BEs */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
}
return ret;
}
static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
{
int ret;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
ret = dpcm_run_update_startup(fe, stream);
if (ret < 0)
dev_err(fe->dev, "failed to startup some BEs\n");
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
return ret;
}
static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
{
int ret;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
ret = dpcm_run_update_shutdown(fe, stream);
if (ret < 0)
dev_err(fe->dev, "failed to shutdown some BEs\n");
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
return ret;
}
/* Called by DAPM mixer/mux changes to update audio routing between PCMs and
* any DAI links.
*/
int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *widget)
{
struct snd_soc_card *card;
int i, old, new, paths;
if (widget->codec)
card = widget->codec->card;
else if (widget->platform)
card = widget->platform->card;
else
return -EINVAL;
mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
for (i = 0; i < card->num_rtd; i++) {
struct snd_soc_dapm_widget_list *list;
struct snd_soc_pcm_runtime *fe = &card->rtd[i];
/* make sure link is FE */
if (!fe->dai_link->dynamic)
continue;
/* only check active links */
if (!fe->cpu_dai->active)
continue;
/* DAPM sync will call this to update DSP paths */
dev_dbg(fe->dev, "DPCM runtime update for FE %s\n",
fe->dai_link->name);
/* skip if FE doesn't have playback capability */
if (!fe->cpu_dai->driver->playback.channels_min)
goto capture;
paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list);
if (paths < 0) {
dev_warn(fe->dev, "%s no valid %s path\n",
fe->dai_link->name, "playback");
mutex_unlock(&card->mutex);
return paths;
}
/* update any new playback paths */
new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 1);
if (new) {
dpcm_run_new_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
}
/* update any old playback paths */
old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_PLAYBACK, &list, 0);
if (old) {
dpcm_run_old_update(fe, SNDRV_PCM_STREAM_PLAYBACK);
dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_PLAYBACK);
dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_PLAYBACK);
}
capture:
/* skip if FE doesn't have capture capability */
if (!fe->cpu_dai->driver->capture.channels_min)
continue;
paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list);
if (paths < 0) {
dev_warn(fe->dev, "%s no valid %s path\n",
fe->dai_link->name, "capture");
mutex_unlock(&card->mutex);
return paths;
}
/* update any new capture paths */
new = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 1);
if (new) {
dpcm_run_new_update(fe, SNDRV_PCM_STREAM_CAPTURE);
dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
}
/* update any old capture paths */
old = dpcm_process_paths(fe, SNDRV_PCM_STREAM_CAPTURE, &list, 0);
if (old) {
dpcm_run_old_update(fe, SNDRV_PCM_STREAM_CAPTURE);
dpcm_clear_pending_state(fe, SNDRV_PCM_STREAM_CAPTURE);
dpcm_be_disconnect(fe, SNDRV_PCM_STREAM_CAPTURE);
}
dpcm_path_put(&list);
}
mutex_unlock(&card->mutex);
return 0;
}
int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute)
{
struct snd_soc_dpcm *dpcm;
struct list_head *clients =
&fe->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients;
list_for_each_entry(dpcm, clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_soc_dai *dai = be->codec_dai;
struct snd_soc_dai_driver *drv = dai->driver;
if (be->dai_link->ignore_suspend)
continue;
dev_dbg(be->dev, "BE digital mute %s\n", be->dai_link->name);
if (drv->ops->digital_mute && dai->playback_active)
drv->ops->digital_mute(dai, mute);
}
return 0;
}
int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
struct snd_soc_dpcm *dpcm;
struct snd_soc_dapm_widget_list *list;
int ret;
int stream = fe_substream->stream;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
fe->dpcm[stream].runtime = fe_substream->runtime;
if (dpcm_path_get(fe, stream, &list) <= 0) {
dev_warn(fe->dev, "asoc: %s no valid %s route\n",
fe->dai_link->name, stream ? "capture" : "playback");
mutex_unlock(&fe->card->mutex);
return -EINVAL;
}
/* calculate valid and active FE <-> BE dpcms */
dpcm_process_paths(fe, stream, &list, 1);
ret = dpcm_fe_dai_startup(fe_substream);
if (ret < 0) {
/* clean up all links */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
dpcm_be_disconnect(fe, stream);
fe->dpcm[stream].runtime = NULL;
}
dpcm_clear_pending_state(fe, stream);
dpcm_path_put(&list);
mutex_unlock(&fe->card->mutex);
return ret;
}
int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
struct snd_soc_dpcm *dpcm;
int stream = fe_substream->stream, ret;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
ret = dpcm_fe_dai_shutdown(fe_substream);
/* mark FE's links ready to prune */
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
dpcm_be_disconnect(fe, stream);
fe->dpcm[stream].runtime = NULL;
mutex_unlock(&fe->card->mutex);
return ret;
}
/* create a new pcm */
int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
{
struct snd_soc_codec *codec = rtd->codec;
struct snd_soc_platform *platform = rtd->platform;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_pcm *pcm;
char new_name[64];
int ret = 0, playback = 0, capture = 0;
if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
if (cpu_dai->driver->playback.channels_min)
playback = 1;
if (cpu_dai->driver->capture.channels_min)
capture = 1;
} else {
if (codec_dai->driver->playback.channels_min)
playback = 1;
if (codec_dai->driver->capture.channels_min)
capture = 1;
}
/* create the PCM */
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, codec_dai->name, num);
ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
capture, &pcm);
}
if (ret < 0) {
printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
return ret;
}
dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num, new_name);
/* DAPM dai link stream work */
INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
rtd->pcm = pcm;
pcm->private_data = rtd;
if (rtd->dai_link->no_pcm) {
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;
}
if (platform->driver->ops) {
rtd->ops.ack = platform->driver->ops->ack;
rtd->ops.copy = platform->driver->ops->copy;
rtd->ops.silence = platform->driver->ops->silence;
rtd->ops.page = platform->driver->ops->page;
rtd->ops.mmap = platform->driver->ops->mmap;
}
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);
if (platform->driver->pcm_new) {
ret = platform->driver->pcm_new(rtd);
if (ret < 0) {
pr_err("asoc: platform pcm constructor failed\n");
return ret;
}
}
pcm->private_free = platform->driver->pcm_free;
out:
printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
cpu_dai->name);
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);
/* get the BE runtime state */
enum snd_soc_dpcm_state
snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
{
return be->dpcm[stream].state;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_get_state);
/* set the BE runtime state */
void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
int stream, enum snd_soc_dpcm_state state)
{
be->dpcm[stream].state = state;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_set_state);
/*
* 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)
{
struct snd_soc_dpcm *dpcm;
int state;
list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
if (dpcm->fe == fe)
continue;
state = dpcm->fe->dpcm[stream].state;
if (state == SND_SOC_DPCM_STATE_START ||
state == SND_SOC_DPCM_STATE_PAUSED ||
state == SND_SOC_DPCM_STATE_SUSPEND)
return 0;
}
/* it's safe to free/stop this BE DAI */
return 1;
}
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)
{
struct snd_soc_dpcm *dpcm;
int state;
list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
if (dpcm->fe == fe)
continue;
state = dpcm->fe->dpcm[stream].state;
if (state == SND_SOC_DPCM_STATE_START ||
state == SND_SOC_DPCM_STATE_PAUSED ||
state == SND_SOC_DPCM_STATE_SUSPEND ||
state == SND_SOC_DPCM_STATE_PREPARE)
return 0;
}
/* it's safe to change hw_params */
return 1;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
int snd_soc_platform_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_platform *platform)
{
if (platform->driver->ops->trigger)
return platform->driver->ops->trigger(substream, cmd);
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_platform_trigger);
#ifdef CONFIG_DEBUG_FS
static 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 int dpcm_state_open_file(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
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 += snprintf(buf + offset, size - offset,
"[%s - %s]\n", fe->dai_link->name,
stream ? "Capture" : "Playback");
offset += snprintf(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 += snprintf(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 += snprintf(buf + offset, size - offset, "Backends:\n");
if (list_empty(&fe->dpcm[stream].be_clients)) {
offset += snprintf(buf + offset, size - offset,
" No active DSP links\n");
goto out;
}
list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
params = &dpcm->hw_params;
offset += snprintf(buf + offset, size - offset,
"- %s\n", be->dai_link->name);
offset += snprintf(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 += snprintf(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;
char *buf;
buf = kmalloc(out_count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (fe->cpu_dai->driver->playback.channels_min)
offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
buf + offset, out_count - offset);
if (fe->cpu_dai->driver->capture.channels_min)
offset += dpcm_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
buf + offset, out_count - offset);
ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
kfree(buf);
return ret;
}
static const struct file_operations dpcm_state_fops = {
.open = dpcm_state_open_file,
.read = dpcm_state_read_file,
.llseek = default_llseek,
};
int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
{
rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
rtd->card->debugfs_card_root);
if (!rtd->debugfs_dpcm_root) {
dev_dbg(rtd->dev,
"ASoC: Failed to create dpcm debugfs directory %s\n",
rtd->dai_link->name);
return -EINVAL;
}
rtd->debugfs_dpcm_state = debugfs_create_file("state", 0644,
rtd->debugfs_dpcm_root,
rtd, &dpcm_state_fops);
return 0;
}
#endif
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