diff options
Diffstat (limited to 'sound/soc/soc-pcm.c')
| -rw-r--r-- | sound/soc/soc-pcm.c | 2828 |
1 files changed, 2828 insertions, 0 deletions
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c new file mode 100644 index 000000000..35fe58f4f --- /dev/null +++ b/sound/soc/soc-pcm.c @@ -0,0 +1,2828 @@ +/* + * 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/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/initval.h> + +#define DPCM_MAX_BE_USERS 8 + +/** + * snd_soc_runtime_activate() - Increment active count for PCM runtime components + * @rtd: ASoC PCM runtime that is activated + * @stream: Direction of the PCM stream + * + * Increments 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->pcm_mutex being held + */ +void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream) +{ + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + int i; + + lockdep_assert_held(&rtd->pcm_mutex); + + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + cpu_dai->playback_active++; + for (i = 0; i < rtd->num_codecs; i++) + rtd->codec_dais[i]->playback_active++; + } else { + cpu_dai->capture_active++; + for (i = 0; i < rtd->num_codecs; i++) + rtd->codec_dais[i]->capture_active++; + } + + cpu_dai->active++; + cpu_dai->component->active++; + for (i = 0; i < rtd->num_codecs; i++) { + rtd->codec_dais[i]->active++; + rtd->codec_dais[i]->component->active++; + } +} + +/** + * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components + * @rtd: ASoC PCM runtime that is deactivated + * @stream: Direction of the PCM stream + * + * Decrements the active count for all the DAIs and components attached to a PCM + * runtime. Should typically be called when a stream is closed. + * + * Must be called with the rtd->pcm_mutex being held + */ +void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream) +{ + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + int i; + + lockdep_assert_held(&rtd->pcm_mutex); + + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + cpu_dai->playback_active--; + for (i = 0; i < rtd->num_codecs; i++) + rtd->codec_dais[i]->playback_active--; + } else { + cpu_dai->capture_active--; + for (i = 0; i < rtd->num_codecs; i++) + rtd->codec_dais[i]->capture_active--; + } + + cpu_dai->active--; + cpu_dai->component->active--; + for (i = 0; i < rtd->num_codecs; i++) { + rtd->codec_dais[i]->component->active--; + rtd->codec_dais[i]->active--; + } +} + +/** + * 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) +{ + int i; + bool ignore = true; + + if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time) + return true; + + for (i = 0; i < rtd->num_codecs; i++) + ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time; + + return rtd->cpu_dai->component->ignore_pmdown_time && 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) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + runtime->hw.info = hw->info; + runtime->hw.formats = hw->formats; + runtime->hw.period_bytes_min = hw->period_bytes_min; + runtime->hw.period_bytes_max = hw->period_bytes_max; + runtime->hw.periods_min = hw->periods_min; + runtime->hw.periods_max = hw->periods_max; + runtime->hw.buffer_bytes_max = hw->buffer_bytes_max; + runtime->hw.fifo_size = hw->fifo_size; + 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; + + list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) { + + 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); + + 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->rate && (soc_dai->driver->symmetric_rates || + rtd->dai_link->symmetric_rates)) { + dev_dbg(soc_dai->dev, "ASoC: 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, + "ASoC: Unable to apply rate constraint: %d\n", + ret); + return ret; + } + } + + if (soc_dai->channels && (soc_dai->driver->symmetric_channels || + rtd->dai_link->symmetric_channels)) { + dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n", + soc_dai->channels); + + ret = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_CHANNELS, + soc_dai->channels, + soc_dai->channels); + if (ret < 0) { + dev_err(soc_dai->dev, + "ASoC: Unable to apply channel symmetry constraint: %d\n", + ret); + return ret; + } + } + + if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits || + rtd->dai_link->symmetric_samplebits)) { + dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n", + soc_dai->sample_bits); + + ret = snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_SAMPLE_BITS, + soc_dai->sample_bits, + soc_dai->sample_bits); + if (ret < 0) { + dev_err(soc_dai->dev, + "ASoC: Unable to apply sample bits symmetry constraint: %d\n", + ret); + return ret; + } + } + + 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 = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + unsigned int rate, channels, sample_bits, symmetry, i; + + rate = params_rate(params); + channels = params_channels(params); + sample_bits = snd_pcm_format_physical_width(params_format(params)); + + /* reject unmatched parameters when applying symmetry */ + symmetry = cpu_dai->driver->symmetric_rates || + rtd->dai_link->symmetric_rates; + + for (i = 0; i < rtd->num_codecs; i++) + symmetry |= rtd->codec_dais[i]->driver->symmetric_rates; + + if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) { + dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n", + cpu_dai->rate, rate); + return -EINVAL; + } + + symmetry = cpu_dai->driver->symmetric_channels || + rtd->dai_link->symmetric_channels; + + for (i = 0; i < rtd->num_codecs; i++) + symmetry |= rtd->codec_dais[i]->driver->symmetric_channels; + + if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) { + dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n", + cpu_dai->channels, channels); + return -EINVAL; + } + + symmetry = cpu_dai->driver->symmetric_samplebits || + rtd->dai_link->symmetric_samplebits; + + for (i = 0; i < rtd->num_codecs; i++) + symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits; + + if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) { + dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n", + cpu_dai->sample_bits, sample_bits); + return -EINVAL; + } + + return 0; +} + +static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver; + struct snd_soc_dai_link *link = rtd->dai_link; + unsigned int symmetry, i; + + symmetry = cpu_driver->symmetric_rates || link->symmetric_rates || + cpu_driver->symmetric_channels || link->symmetric_channels || + cpu_driver->symmetric_samplebits || link->symmetric_samplebits; + + for (i = 0; i < rtd->num_codecs; i++) + symmetry = symmetry || + rtd->codec_dais[i]->driver->symmetric_rates || + rtd->codec_dais[i]->driver->symmetric_channels || + rtd->codec_dais[i]->driver->symmetric_samplebits; + + return symmetry; +} + +static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + 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 = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + struct snd_soc_dai *codec_dai; + int i; + unsigned int bits = 0, cpu_bits; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->playback.sig_bits == 0) { + bits = 0; + break; + } + bits = max(codec_dai->driver->playback.sig_bits, bits); + } + cpu_bits = cpu_dai->driver->playback.sig_bits; + } else { + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->capture.sig_bits == 0) { + bits = 0; + break; + } + bits = max(codec_dai->driver->capture.sig_bits, bits); + } + cpu_bits = cpu_dai->driver->capture.sig_bits; + } + + soc_pcm_set_msb(substream, bits); + soc_pcm_set_msb(substream, cpu_bits); +} + +static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_pcm_hardware *hw = &runtime->hw; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver; + struct snd_soc_dai_driver *codec_dai_drv; + struct snd_soc_pcm_stream *codec_stream; + struct snd_soc_pcm_stream *cpu_stream; + unsigned int chan_min = 0, chan_max = UINT_MAX; + unsigned int rate_min = 0, rate_max = UINT_MAX; + unsigned int rates = UINT_MAX; + u64 formats = ULLONG_MAX; + int i; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + cpu_stream = &cpu_dai_drv->playback; + else + cpu_stream = &cpu_dai_drv->capture; + + /* first calculate min/max only for CODECs in the DAI link */ + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai_drv = rtd->codec_dais[i]->driver; + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + codec_stream = &codec_dai_drv->playback; + else + codec_stream = &codec_dai_drv->capture; + chan_min = max(chan_min, codec_stream->channels_min); + chan_max = min(chan_max, codec_stream->channels_max); + rate_min = max(rate_min, codec_stream->rate_min); + rate_max = min_not_zero(rate_max, codec_stream->rate_max); + formats &= codec_stream->formats; + rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates); + } + + /* + * chan min/max cannot be enforced if there are multiple CODEC DAIs + * connected to a single CPU DAI, use CPU DAI's directly and let + * channel allocation be fixed up later + */ + if (rtd->num_codecs > 1) { + chan_min = cpu_stream->channels_min; + chan_max = cpu_stream->channels_max; + } + + hw->channels_min = max(chan_min, cpu_stream->channels_min); + hw->channels_max = min(chan_max, cpu_stream->channels_max); + if (hw->formats) + hw->formats &= formats & cpu_stream->formats; + else + hw->formats = formats & cpu_stream->formats; + hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates); + + snd_pcm_limit_hw_rates(runtime); + + hw->rate_min = max(hw->rate_min, cpu_stream->rate_min); + hw->rate_min = max(hw->rate_min, rate_min); + hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max); + hw->rate_max = min_not_zero(hw->rate_max, rate_max); +} + +/* + * 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; + const char *codec_dai_name = "multicodec"; + int i, ret = 0; + + pinctrl_pm_select_default_state(cpu_dai->dev); + for (i = 0; i < rtd->num_codecs; i++) + pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev); + pm_runtime_get_sync(cpu_dai->dev); + for (i = 0; i < rtd->num_codecs; i++) + pm_runtime_get_sync(rtd->codec_dais[i]->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 && cpu_dai->driver->ops->startup) { + ret = cpu_dai->driver->ops->startup(substream, cpu_dai); + if (ret < 0) { + dev_err(cpu_dai->dev, "ASoC: 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, "ASoC: can't open platform" + " %s: %d\n", platform->component.name, ret); + goto platform_err; + } + } + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops && codec_dai->driver->ops->startup) { + ret = codec_dai->driver->ops->startup(substream, + codec_dai); + if (ret < 0) { + dev_err(codec_dai->dev, + "ASoC: can't open codec %s: %d\n", + codec_dai->name, ret); + goto codec_dai_err; + } + } + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + codec_dai->tx_mask = 0; + else + codec_dai->rx_mask = 0; + } + + 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 */ + soc_pcm_init_runtime_hw(substream); + + if (rtd->num_codecs == 1) + codec_dai_name = rtd->codec_dai->name; + + if (soc_pcm_has_symmetry(substream)) + runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX; + + ret = -EINVAL; + 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); + + /* 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; + } + + for (i = 0; i < rtd->num_codecs; i++) { + if (rtd->codec_dais[i]->active) { + ret = soc_pcm_apply_symmetry(substream, + rtd->codec_dais[i]); + 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: + + snd_soc_runtime_activate(rtd, substream->stream); + + 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: + i = rtd->num_codecs; + +codec_dai_err: + while (--i >= 0) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops->shutdown) + codec_dai->driver->ops->shutdown(substream, codec_dai); + } + + 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); + for (i = 0; i < rtd->num_codecs; i++) + pm_runtime_put(rtd->codec_dais[i]->dev); + pm_runtime_put(cpu_dai->dev); + for (i = 0; i < rtd->num_codecs; i++) { + if (!rtd->codec_dais[i]->active) + pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev); + } + if (!cpu_dai->active) + pinctrl_pm_select_sleep_state(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_dais[0]; + + mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + + dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n", + codec_dai->driver->playback.stream_name, + codec_dai->playback_active ? "active" : "inactive", + rtd->pop_wait ? "yes" : "no"); + + /* are we waiting on this codec DAI stream */ + if (rtd->pop_wait == 1) { + rtd->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; + int i; + + mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + + snd_soc_runtime_deactivate(rtd, substream->stream); + + /* clear the corresponding DAIs rate when inactive */ + if (!cpu_dai->active) + cpu_dai->rate = 0; + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (!codec_dai->active) + codec_dai->rate = 0; + } + + snd_soc_dai_digital_mute(cpu_dai, 1, substream->stream); + + if (cpu_dai->driver->ops->shutdown) + cpu_dai->driver->ops->shutdown(substream, cpu_dai); + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + 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); + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + if (snd_soc_runtime_ignore_pmdown_time(rtd)) { + /* 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 */ + rtd->pop_wait = 1; + queue_delayed_work(system_power_efficient_wq, + &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); + for (i = 0; i < rtd->num_codecs; i++) + pm_runtime_put(rtd->codec_dais[i]->dev); + pm_runtime_put(cpu_dai->dev); + for (i = 0; i < rtd->num_codecs; i++) { + if (!rtd->codec_dais[i]->active) + pinctrl_pm_select_sleep_state(rtd->codec_dais[i]->dev); + } + if (!cpu_dai->active) + pinctrl_pm_select_sleep_state(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; + int i, 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) { + dev_err(rtd->card->dev, "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, "ASoC: platform prepare error:" + " %d\n", ret); + goto out; + } + } + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops && codec_dai->driver->ops->prepare) { + ret = codec_dai->driver->ops->prepare(substream, + codec_dai); + if (ret < 0) { + dev_err(codec_dai->dev, + "ASoC: codec DAI prepare error: %d\n", + ret); + goto out; + } + } + } + + if (cpu_dai->driver->ops && cpu_dai->driver->ops->prepare) { + ret = cpu_dai->driver->ops->prepare(substream, cpu_dai); + if (ret < 0) { + dev_err(cpu_dai->dev, + "ASoC: cpu DAI prepare error: %d\n", ret); + 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 (i = 0; i < rtd->num_codecs; i++) + snd_soc_dai_digital_mute(rtd->codec_dais[i], 0, + substream->stream); + snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream); + +out: + mutex_unlock(&rtd->pcm_mutex); + 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; +} + +int soc_dai_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + int ret; + + if (dai->driver->ops && dai->driver->ops->hw_params) { + ret = dai->driver->ops->hw_params(substream, params, dai); + if (ret < 0) { + dev_err(dai->dev, "ASoC: can't set %s hw params: %d\n", + dai->name, ret); + return ret; + } + } + + return 0; +} + +/* + * 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; + int i, ret = 0; + + mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + + ret = soc_pcm_params_symmetry(substream, params); + if (ret) + goto out; + + if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) { + ret = rtd->dai_link->ops->hw_params(substream, params); + if (ret < 0) { + dev_err(rtd->card->dev, "ASoC: machine hw_params" + " failed: %d\n", ret); + goto out; + } + } + + for (i = 0; i < rtd->num_codecs; i++) { + struct snd_soc_dai *codec_dai = rtd->codec_dais[i]; + struct snd_pcm_hw_params codec_params; + + /* copy params for each codec */ + codec_params = *params; + + /* fixup params based on TDM slot masks */ + if (codec_dai->tx_mask) + soc_pcm_codec_params_fixup(&codec_params, + codec_dai->tx_mask); + if (codec_dai->rx_mask) + soc_pcm_codec_params_fixup(&codec_params, + codec_dai->rx_mask); + + ret = soc_dai_hw_params(substream, &codec_params, codec_dai); + if(ret < 0) + goto codec_err; + + codec_dai->rate = params_rate(&codec_params); + codec_dai->channels = params_channels(&codec_params); + codec_dai->sample_bits = snd_pcm_format_physical_width( + params_format(&codec_params)); + } + + ret = soc_dai_hw_params(substream, params, cpu_dai); + if (ret < 0) + 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, "ASoC: %s hw params failed: %d\n", + platform->component.name, ret); + goto platform_err; + } + } + + /* store the parameters for each DAIs */ + cpu_dai->rate = params_rate(params); + cpu_dai->channels = params_channels(params); + cpu_dai->sample_bits = + snd_pcm_format_physical_width(params_format(params)); + +out: + mutex_unlock(&rtd->pcm_mutex); + return ret; + +platform_err: + if (cpu_dai->driver->ops && cpu_dai->driver->ops->hw_free) + cpu_dai->driver->ops->hw_free(substream, cpu_dai); + +interface_err: + i = rtd->num_codecs; + +codec_err: + while (--i >= 0) { + struct snd_soc_dai *codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free) + codec_dai->driver->ops->hw_free(substream, codec_dai); + codec_dai->rate = 0; + } + + 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; + bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; + int i; + + mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + + /* clear the corresponding DAIs parameters when going to be inactive */ + if (cpu_dai->active == 1) { + cpu_dai->rate = 0; + cpu_dai->channels = 0; + cpu_dai->sample_bits = 0; + } + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->active == 1) { + codec_dai->rate = 0; + codec_dai->channels = 0; + codec_dai->sample_bits = 0; + } + } + + /* apply codec digital mute */ + for (i = 0; i < rtd->num_codecs; i++) { + if ((playback && rtd->codec_dais[i]->playback_active == 1) || + (!playback && rtd->codec_dais[i]->capture_active == 1)) + snd_soc_dai_digital_mute(rtd->codec_dais[i], 1, + substream->stream); + } + + /* 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 */ + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops && codec_dai->driver->ops->hw_free) + codec_dai->driver->ops->hw_free(substream, codec_dai); + } + + if (cpu_dai->driver->ops && 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; + int i, ret; + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops && 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 && cpu_dai->driver->ops->trigger) { + ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai); + if (ret < 0) + return ret; + } + + if (rtd->dai_link->ops && rtd->dai_link->ops->trigger) { + ret = rtd->dai_link->ops->trigger(substream, cmd); + if (ret < 0) + return ret; + } + + return 0; +} + +static 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; + int i, ret; + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops && + 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 && 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; + struct snd_pcm_runtime *runtime = substream->runtime; + snd_pcm_uframes_t offset = 0; + snd_pcm_sframes_t delay = 0; + snd_pcm_sframes_t codec_delay = 0; + int i; + + if (platform->driver->ops && platform->driver->ops->pointer) + offset = platform->driver->ops->pointer(substream); + + if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay) + delay += cpu_dai->driver->ops->delay(substream, cpu_dai); + + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->ops && codec_dai->driver->ops->delay) + codec_delay = max(codec_delay, + codec_dai->driver->ops->delay(substream, + codec_dai)); + } + delay += codec_delay; + + /* + * None of the existing platform drivers implement delay(), so + * for now the codec_dai of first multicodec entry is used + */ + if (platform->driver->delay) + delay += platform->driver->delay(substream, rtd->codec_dais[0]); + + 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 + if (fe->debugfs_dpcm_root) + 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 */ +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, "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); + +#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, j; + + if (stream == SNDRV_PCM_STREAM_PLAYBACK) { + for (i = 0; i < card->num_links; i++) { + be = &card->rtd[i]; + + if (!be->dai_link->no_pcm) + continue; + + if (be->cpu_dai->playback_widget == widget) + return be; + + for (j = 0; j < be->num_codecs; j++) { + struct snd_soc_dai *dai = be->codec_dais[j]; + if (dai->playback_widget == widget) + return be; + } + } + } else { + + for (i = 0; i < card->num_links; i++) { + be = &card->rtd[i]; + + if (!be->dai_link->no_pcm) + continue; + + if (be->cpu_dai->capture_widget == widget) + return be; + + for (j = 0; j < be->num_codecs; j++) { + struct snd_soc_dai *dai = be->codec_dais[j]; + if (dai->capture_widget == widget) + return be; + } + } + } + + dev_err(card->dev, "ASoC: can't get %s BE for %s\n", + stream ? "capture" : "playback", widget->name); + return NULL; +} + +static inline struct snd_soc_dapm_widget * + dai_get_widget(struct snd_soc_dai *dai, int stream) +{ + if (stream == SNDRV_PCM_STREAM_PLAYBACK) + return dai->playback_widget; + else + return 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; +} + +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, "ASoC: found %d audio %s paths\n", paths, + stream ? "capture" : "playback"); + + *list_ = list; + return paths; +} + +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) { + unsigned int i; + + /* is there a valid CPU DAI widget for this BE */ + widget = dai_get_widget(dpcm->be->cpu_dai, 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 */ + for (i = 0; i < dpcm->be->num_codecs; i++) { + struct snd_soc_dai *dai = dpcm->be->codec_dais[i]; + widget = dai_get_widget(dai, 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, "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->be->dpcm[stream].runtime_update = 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; + int i, new = 0, err; + + /* Create any new FE <--> BE connections */ + for (i = 0; i < list->num_widgets; i++) { + + switch (list->widgets[i]->id) { + case snd_soc_dapm_dai_in: + case snd_soc_dapm_dai_out: + break; + default: + 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, "ASoC: 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 && !fe->fe_compr) + 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", + 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, "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; + + 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, "ASoC: 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; + } +} + +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); + + 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); + + 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_substream); + if (err < 0) { + dev_err(be->dev, "ASoC: BE open failed %d\n", err); + 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].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, "ASoC: 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; +} + +static void dpcm_init_runtime_hw(struct snd_pcm_runtime *runtime, + struct snd_soc_pcm_stream *stream) +{ + runtime->hw.rate_min = stream->rate_min; + runtime->hw.rate_max = stream->rate_max; + runtime->hw.channels_min = stream->channels_min; + runtime->hw.channels_max = stream->channels_max; + if (runtime->hw.formats) + runtime->hw.formats &= stream->formats; + else + runtime->hw.formats = stream->formats; + runtime->hw.rates = stream->rates; +} + +static 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) + dpcm_init_runtime_hw(runtime, &cpu_dai_drv->playback); + else + dpcm_init_runtime_hw(runtime, &cpu_dai_drv->capture); +} + +static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd); + +/* 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 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_pcm_stream_lock_irq(substream); + 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_pcm_stream_unlock_irq(substream); +} + +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; + + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); + + ret = dpcm_be_dai_startup(fe, fe_substream->stream); + if (ret < 0) { + dev_err(fe->dev,"ASoC: failed to start some BEs %d\n", ret); + 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_substream); + if (ret < 0) { + dev_err(fe->dev,"ASoC: 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); + + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); + return 0; + +unwind: + dpcm_be_dai_startup_unwind(fe, fe_substream->stream); +be_err: + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); + return ret; +} + +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, "ASoC: 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, "ASoC: 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; + + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE); + + /* shutdown the BEs */ + dpcm_be_dai_shutdown(fe, substream->stream); + + dev_dbg(fe->dev, "ASoC: 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; + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); + return 0; +} + +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; + + /* 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)) + continue; + + dev_dbg(be->dev, "ASoC: 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; +} + +static 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); + 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 */ + err = soc_pcm_hw_free(substream); + if (err < 0) + dev_err(fe->dev,"ASoC: 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; + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); + + mutex_unlock(&fe->card->mutex); + return 0; +} + +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, "ASoC: 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, + "ASoC: 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, + "ASoC: 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; +} + +static 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); + dpcm_set_fe_update_state(fe, stream, 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,"ASoC: hw_params BE failed %d\n", ret); + 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(substream, params); + if (ret < 0) { + dev_err(fe->dev,"ASoC: 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: + dpcm_set_fe_update_state(fe, stream, 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, "ASoC: 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,"ASoC: 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_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_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); + +static int dpcm_fe_dai_do_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, "ASoC: 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,"ASoC: 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,"ASoC: trigger FE failed %d\n", ret); + goto out; + } + + dev_dbg(fe->dev, "ASoC: 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, "ASoC: 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,"ASoC: trigger FE failed %d\n", ret); + goto out; + } + break; + default: + dev_err(fe->dev, "ASoC: 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_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_soc_pcm_runtime *fe = substream->private_data; + 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; + + 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, "ASoC: prepare BE %s\n", + dpcm->fe->dai_link->name); + + ret = soc_pcm_prepare(be_substream); + if (ret < 0) { + dev_err(be->dev, "ASoC: backend prepare failed %d\n", + ret); + break; + } + + be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE; + } + return ret; +} + +static 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, "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, substream->stream); + if (ret < 0) + goto out; + + /* call prepare on the frontend */ + ret = soc_pcm_prepare(substream); + if (ret < 0) { + dev_err(fe->dev,"ASoC: 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: + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); + mutex_unlock(&fe->card->mutex); + + return ret; +} + +static int soc_pcm_ioctl(struct snd_pcm_substream *substream, + unsigned int cmd, void *arg) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_platform *platform = rtd->platform; + + if (platform->driver->ops && platform->driver->ops->ioctl) + return platform->driver->ops->ioctl(substream, cmd, arg); + return snd_pcm_lib_ioctl(substream, cmd, arg); +} + +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 = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP); + if (err < 0) + dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err); + } 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); + if (err < 0) + dev_err(fe->dev,"ASoC: trigger FE failed %d\n", err); + } + + err = dpcm_be_dai_hw_free(fe, stream); + if (err < 0) + dev_err(fe->dev,"ASoC: hw_free FE failed %d\n", err); + + err = dpcm_be_dai_shutdown(fe, stream); + if (err < 0) + dev_err(fe->dev,"ASoC: 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, "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) + return -EINVAL; + + /* 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 = soc_pcm_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START); + if (ret < 0) { + dev_err(fe->dev,"ASoC: bespoke trigger FE failed %d\n", ret); + 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) { + dev_err(fe->dev,"ASoC: 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; + + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE); + ret = dpcm_run_update_startup(fe, stream); + if (ret < 0) + dev_err(fe->dev, "ASoC: failed to startup some BEs\n"); + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO); + + return ret; +} + +static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream) +{ + int ret; + + dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE); + ret = dpcm_run_update_shutdown(fe, stream); + if (ret < 0) + dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n"); + dpcm_set_fe_update_state(fe, stream, 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_card *card) +{ + int i, old, new, paths; + + 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, "ASoC: 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 + || !fe->codec_dai->driver->playback.channels_min) + goto capture; + + /* skip if FE isn't currently playing */ + if (!fe->cpu_dai->playback_active + || !fe->codec_dai->playback_active) + goto capture; + + paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_PLAYBACK, &list); + if (paths < 0) { + dev_warn(fe->dev, "ASoC: %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); + } + + dpcm_path_put(&list); +capture: + /* skip if FE doesn't have capture capability */ + if (!fe->cpu_dai->driver->capture.channels_min + || !fe->codec_dai->driver->capture.channels_min) + continue; + + /* skip if FE isn't currently capturing */ + if (!fe->cpu_dai->capture_active + || !fe->codec_dai->capture_active) + continue; + + paths = dpcm_path_get(fe, SNDRV_PCM_STREAM_CAPTURE, &list); + if (paths < 0) { + dev_warn(fe->dev, "ASoC: %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; + int i; + + if (be->dai_link->ignore_suspend) + continue; + + for (i = 0; i < be->num_codecs; i++) { + struct snd_soc_dai *dai = be->codec_dais[i]; + struct snd_soc_dai_driver *drv = dai->driver; + + dev_dbg(be->dev, "ASoC: BE digital mute %s\n", + be->dai_link->name); + + if (drv->ops && drv->ops->digital_mute && + dai->playback_active) + drv->ops->digital_mute(dai, mute); + } + } + + return 0; +} + +static 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; + + ret = dpcm_path_get(fe, stream, &list); + if (ret < 0) { + mutex_unlock(&fe->card->mutex); + return ret; + } else if (ret == 0) { + dev_dbg(fe->dev, "ASoC: %s no valid %s route\n", + fe->dai_link->name, stream ? "capture" : "playback"); + } + + /* 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; +} + +static 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_platform *platform = rtd->platform; + struct snd_soc_dai *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; + int i; + + if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) { + playback = rtd->dai_link->dpcm_playback; + capture = rtd->dai_link->dpcm_capture; + } else { + for (i = 0; i < rtd->num_codecs; i++) { + codec_dai = rtd->codec_dais[i]; + if (codec_dai->driver->playback.channels_min) + playback = 1; + if (codec_dai->driver->capture.channels_min) + capture = 1; + } + + capture = capture && cpu_dai->driver->capture.channels_min; + playback = playback && cpu_dai->driver->playback.channels_min; + } + + if (rtd->dai_link->playback_only) { + playback = 1; + capture = 0; + } + + if (rtd->dai_link->capture_only) { + playback = 0; + 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, + (rtd->num_codecs > 1) ? + "multicodec" : rtd->codec_dai->name, 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 for %s\n", + rtd->dai_link->name); + return ret; + } + dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name); + + /* DAPM dai link stream work */ + INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work); + + pcm->nonatomic = rtd->dai_link->nonatomic; + 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; + rtd->ops.ioctl = soc_pcm_ioctl; + } 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; + rtd->ops.ioctl = soc_pcm_ioctl; + } + + 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) { + dev_err(platform->dev, + "ASoC: pcm constructor failed: %d\n", + ret); + return ret; + } + } + + pcm->private_free = platform->driver->pcm_free; +out: + dev_info(rtd->card->dev, "%s <-> %s mapping ok\n", + (rtd->num_codecs > 1) ? "multicodec" : rtd->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 && 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 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 = 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) + return; + + if (!rtd->card->debugfs_card_root) + return; + + 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; + } + + rtd->debugfs_dpcm_state = debugfs_create_file("state", 0444, + rtd->debugfs_dpcm_root, + rtd, &dpcm_state_fops); +} +#endif |