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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/slab.h>
#include <linux/workqueue.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
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;
}
/*
* 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;
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) {
printk(KERN_ERR "asoc: can't open interface %s\n",
cpu_dai->name);
goto out;
}
}
if (platform->driver->ops && platform->driver->ops->open) {
ret = platform->driver->ops->open(substream);
if (ret < 0) {
printk(KERN_ERR "asoc: can't open platform %s\n", platform->name);
goto platform_err;
}
}
if (codec_dai->driver->ops->startup) {
ret = codec_dai->driver->ops->startup(substream, codec_dai);
if (ret < 0) {
printk(KERN_ERR "asoc: can't open codec %s\n",
codec_dai->name);
goto codec_dai_err;
}
}
if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
ret = rtd->dai_link->ops->startup(substream);
if (ret < 0) {
printk(KERN_ERR "asoc: %s startup failed\n", rtd->dai_link->name);
goto machine_err;
}
}
/* 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;
}
/* 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);
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);
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,
codec_dai->driver->playback.stream_name,
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 (unlikely(codec->ignore_pmdown_time)) {
/* powered down playback stream now */
snd_soc_dapm_stream_event(rtd,
codec_dai->driver->playback.stream_name,
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,
codec_dai->driver->capture.stream_name,
SND_SOC_DAPM_STREAM_STOP);
}
mutex_unlock(&rtd->pcm_mutex);
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) {
printk(KERN_ERR "asoc: machine prepare error\n");
goto out;
}
}
if (platform->driver->ops && platform->driver->ops->prepare) {
ret = platform->driver->ops->prepare(substream);
if (ret < 0) {
printk(KERN_ERR "asoc: platform prepare error\n");
goto out;
}
}
if (codec_dai->driver->ops->prepare) {
ret = codec_dai->driver->ops->prepare(substream, codec_dai);
if (ret < 0) {
printk(KERN_ERR "asoc: codec DAI prepare error\n");
goto out;
}
}
if (cpu_dai->driver->ops->prepare) {
ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
if (ret < 0) {
printk(KERN_ERR "asoc: cpu DAI prepare error\n");
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);
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
snd_soc_dapm_stream_event(rtd,
codec_dai->driver->playback.stream_name,
SND_SOC_DAPM_STREAM_START);
else
snd_soc_dapm_stream_event(rtd,
codec_dai->driver->capture.stream_name,
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) {
printk(KERN_ERR "asoc: machine hw_params failed\n");
goto out;
}
}
if (codec_dai->driver->ops->hw_params) {
ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
if (ret < 0) {
printk(KERN_ERR "asoc: can't set codec %s hw params\n",
codec_dai->name);
goto codec_err;
}
}
if (cpu_dai->driver->ops->hw_params) {
ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
if (ret < 0) {
printk(KERN_ERR "asoc: interface %s hw params failed\n",
cpu_dai->name);
goto interface_err;
}
}
if (platform->driver->ops && platform->driver->ops->hw_params) {
ret = platform->driver->ops->hw_params(substream, params);
if (ret < 0) {
printk(KERN_ERR "asoc: platform %s hw params failed\n",
platform->name);
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;
}
/*
* 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;
}
/* ASoC PCM operations */
static struct snd_pcm_ops soc_pcm_ops = {
.open = soc_pcm_open,
.close = soc_pcm_close,
.hw_params = soc_pcm_hw_params,
.hw_free = soc_pcm_hw_free,
.prepare = soc_pcm_prepare,
.trigger = soc_pcm_trigger,
.pointer = soc_pcm_pointer,
};
/* 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;
/* check client and interface hw capabilities */
snprintf(new_name, sizeof(new_name), "%s %s-%d",
rtd->dai_link->stream_name, codec_dai->name, num);
if (codec_dai->driver->playback.channels_min)
playback = 1;
if (codec_dai->driver->capture.channels_min)
capture = 1;
dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num,new_name);
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;
}
/* DAPM dai link stream work */
INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
rtd->pcm = pcm;
pcm->private_data = rtd;
if (platform->driver->ops) {
soc_pcm_ops.mmap = platform->driver->ops->mmap;
soc_pcm_ops.pointer = platform->driver->ops->pointer;
soc_pcm_ops.ioctl = platform->driver->ops->ioctl;
soc_pcm_ops.copy = platform->driver->ops->copy;
soc_pcm_ops.silence = platform->driver->ops->silence;
soc_pcm_ops.ack = platform->driver->ops->ack;
soc_pcm_ops.page = platform->driver->ops->page;
}
if (playback)
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &soc_pcm_ops);
if (capture)
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &soc_pcm_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;
printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
cpu_dai->name);
return ret;
}
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