soc-core.c

linux 内核源代码

	return ret;

platform_err:
	if (cpu_dai->ops.hw_free)
		cpu_dai->ops.hw_free(substream);

interface_err:
	if (codec_dai->ops.hw_free)
		codec_dai->ops.hw_free(substream);

codec_err:
	if(machine->ops && machine->ops->hw_free)
		machine->ops->hw_free(substream);

	mutex_unlock(&pcm_mutex);
	return ret;
}

/*
 * Free's 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_device *socdev = rtd->socdev;
	struct snd_soc_dai_link *machine = rtd->dai;
	struct snd_soc_platform *platform = socdev->platform;
	struct snd_soc_cpu_dai *cpu_dai = machine->cpu_dai;
	struct snd_soc_codec_dai *codec_dai = machine->codec_dai;
	struct snd_soc_codec *codec = socdev->codec;

	mutex_lock(&pcm_mutex);

	/* apply codec digital mute */
	if (!codec->active && codec_dai->dai_ops.digital_mute)
		codec_dai->dai_ops.digital_mute(codec_dai, 1);

	/* free any machine hw params */
	if (machine->ops && machine->ops->hw_free)
		machine->ops->hw_free(substream);

	/* free any DMA resources */
	if (platform->pcm_ops->hw_free)
		platform->pcm_ops->hw_free(substream);

	/* now free hw params for the DAI's  */
	if (codec_dai->ops.hw_free)
		codec_dai->ops.hw_free(substream);

	if (cpu_dai->ops.hw_free)
		cpu_dai->ops.hw_free(substream);

	mutex_unlock(&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_device *socdev = rtd->socdev;
	struct snd_soc_dai_link *machine = rtd->dai;
	struct snd_soc_platform *platform = socdev->platform;
	struct snd_soc_cpu_dai *cpu_dai = machine->cpu_dai;
	struct snd_soc_codec_dai *codec_dai = machine->codec_dai;
	int ret;

	if (codec_dai->ops.trigger) {
		ret = codec_dai->ops.trigger(substream, cmd);
		if (ret < 0)
			return ret;
	}

	if (platform->pcm_ops->trigger) {
		ret = platform->pcm_ops->trigger(substream, cmd);
		if (ret < 0)
			return ret;
	}

	if (cpu_dai->ops.trigger) {
		ret = cpu_dai->ops.trigger(substream, cmd);
		if (ret < 0)
			return ret;
	}
	return 0;
}

/* ASoC PCM operations */
static struct snd_pcm_ops soc_pcm_ops = {
	.open		= soc_pcm_open,
	.close		= soc_codec_close,
	.hw_params	= soc_pcm_hw_params,
	.hw_free	= soc_pcm_hw_free,
	.prepare	= soc_pcm_prepare,
	.trigger	= soc_pcm_trigger,
};

#ifdef CONFIG_PM
/* powers down audio subsystem for suspend */
static int soc_suspend(struct platform_device *pdev, pm_message_t state)
{
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_machine *machine = socdev->machine;
 	struct snd_soc_platform *platform = socdev->platform;
 	struct snd_soc_codec_device *codec_dev = socdev->codec_dev;
	struct snd_soc_codec *codec = socdev->codec;
	int i;

	/* mute any active DAC's */
	for(i = 0; i < machine->num_links; i++) {
		struct snd_soc_codec_dai *dai = machine->dai_link[i].codec_dai;
		if (dai->dai_ops.digital_mute && dai->playback.active)
			dai->dai_ops.digital_mute(dai, 1);
	}

	if (machine->suspend_pre)
		machine->suspend_pre(pdev, state);

	for(i = 0; i < machine->num_links; i++) {
		struct snd_soc_cpu_dai  *cpu_dai = machine->dai_link[i].cpu_dai;
		if (cpu_dai->suspend && cpu_dai->type != SND_SOC_DAI_AC97)
			cpu_dai->suspend(pdev, cpu_dai);
		if (platform->suspend)
			platform->suspend(pdev, cpu_dai);
	}

	/* close any waiting streams and save state */
	run_delayed_work(&socdev->delayed_work);
	codec->suspend_dapm_state = codec->dapm_state;

	for(i = 0; i < codec->num_dai; i++) {
		char *stream = codec->dai[i].playback.stream_name;
		if (stream != NULL)
			snd_soc_dapm_stream_event(codec, stream,
				SND_SOC_DAPM_STREAM_SUSPEND);
		stream = codec->dai[i].capture.stream_name;
		if (stream != NULL)
			snd_soc_dapm_stream_event(codec, stream,
				SND_SOC_DAPM_STREAM_SUSPEND);
	}

	if (codec_dev->suspend)
		codec_dev->suspend(pdev, state);

	for(i = 0; i < machine->num_links; i++) {
		struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[i].cpu_dai;
		if (cpu_dai->suspend && cpu_dai->type == SND_SOC_DAI_AC97)
			cpu_dai->suspend(pdev, cpu_dai);
	}

	if (machine->suspend_post)
		machine->suspend_post(pdev, state);

	return 0;
}

/* powers up audio subsystem after a suspend */
static int soc_resume(struct platform_device *pdev)
{
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_machine *machine = socdev->machine;
 	struct snd_soc_platform *platform = socdev->platform;
 	struct snd_soc_codec_device *codec_dev = socdev->codec_dev;
	struct snd_soc_codec *codec = socdev->codec;
	int i;

	if (machine->resume_pre)
		machine->resume_pre(pdev);

	for(i = 0; i < machine->num_links; i++) {
		struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[i].cpu_dai;
		if (cpu_dai->resume && cpu_dai->type == SND_SOC_DAI_AC97)
			cpu_dai->resume(pdev, cpu_dai);
	}

	if (codec_dev->resume)
		codec_dev->resume(pdev);

	for(i = 0; i < codec->num_dai; i++) {
		char* stream = codec->dai[i].playback.stream_name;
		if (stream != NULL)
			snd_soc_dapm_stream_event(codec, stream,
				SND_SOC_DAPM_STREAM_RESUME);
		stream = codec->dai[i].capture.stream_name;
		if (stream != NULL)
			snd_soc_dapm_stream_event(codec, stream,
				SND_SOC_DAPM_STREAM_RESUME);
	}

	/* unmute any active DAC's */
	for(i = 0; i < machine->num_links; i++) {
		struct snd_soc_codec_dai *dai = machine->dai_link[i].codec_dai;
		if (dai->dai_ops.digital_mute && dai->playback.active)
			dai->dai_ops.digital_mute(dai, 0);
	}

	for(i = 0; i < machine->num_links; i++) {
		struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[i].cpu_dai;
		if (cpu_dai->resume && cpu_dai->type != SND_SOC_DAI_AC97)
			cpu_dai->resume(pdev, cpu_dai);
		if (platform->resume)
			platform->resume(pdev, cpu_dai);
	}

	if (machine->resume_post)
		machine->resume_post(pdev);

	return 0;
}

#else
#define soc_suspend	NULL
#define soc_resume	NULL
#endif

/* probes a new socdev */
static int soc_probe(struct platform_device *pdev)
{
	int ret = 0, i;
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_machine *machine = socdev->machine;
	struct snd_soc_platform *platform = socdev->platform;
	struct snd_soc_codec_device *codec_dev = socdev->codec_dev;

	if (machine->probe) {
		ret = machine->probe(pdev);
		if(ret < 0)
			return ret;
	}

	for (i = 0; i < machine->num_links; i++) {
		struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[i].cpu_dai;
		if (cpu_dai->probe) {
			ret = cpu_dai->probe(pdev);
			if(ret < 0)
				goto cpu_dai_err;
		}
	}

	if (codec_dev->probe) {
		ret = codec_dev->probe(pdev);
		if(ret < 0)
			goto cpu_dai_err;
	}

	if (platform->probe) {
		ret = platform->probe(pdev);
		if(ret < 0)
			goto platform_err;
	}

	/* DAPM stream work */
	INIT_DELAYED_WORK(&socdev->delayed_work, close_delayed_work);
	return 0;

platform_err:
	if (codec_dev->remove)
		codec_dev->remove(pdev);

cpu_dai_err:
	for (i--; i >= 0; i--) {
		struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[i].cpu_dai;
		if (cpu_dai->remove)
			cpu_dai->remove(pdev);
	}

	if (machine->remove)
		machine->remove(pdev);

	return ret;
}

/* removes a socdev */
static int soc_remove(struct platform_device *pdev)
{
	int i;
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_machine *machine = socdev->machine;
	struct snd_soc_platform *platform = socdev->platform;
	struct snd_soc_codec_device *codec_dev = socdev->codec_dev;

	run_delayed_work(&socdev->delayed_work);

	if (platform->remove)
		platform->remove(pdev);

	if (codec_dev->remove)
		codec_dev->remove(pdev);

	for (i = 0; i < machine->num_links; i++) {
		struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[i].cpu_dai;
		if (cpu_dai->remove)
			cpu_dai->remove(pdev);
	}

	if (machine->remove)
		machine->remove(pdev);

	return 0;
}

/* ASoC platform driver */
static struct platform_driver soc_driver = {
	.driver		= {
		.name		= "soc-audio",
	},
	.probe		= soc_probe,
	.remove		= soc_remove,
	.suspend	= soc_suspend,
	.resume		= soc_resume,
};

/* create a new pcm */
static int soc_new_pcm(struct snd_soc_device *socdev,
	struct snd_soc_dai_link *dai_link, int num)
{
	struct snd_soc_codec *codec = socdev->codec;
	struct snd_soc_codec_dai *codec_dai = dai_link->codec_dai;
	struct snd_soc_cpu_dai *cpu_dai = dai_link->cpu_dai;
	struct snd_soc_pcm_runtime *rtd;
	struct snd_pcm *pcm;
	char new_name[64];
	int ret = 0, playback = 0, capture = 0;

	rtd = kzalloc(sizeof(struct snd_soc_pcm_runtime), GFP_KERNEL);
	if (rtd == NULL)
		return -ENOMEM;

	rtd->dai = dai_link;
	rtd->socdev = socdev;
	codec_dai->codec = socdev->codec;

	/* check client and interface hw capabilities */
	sprintf(new_name, "%s %s-%s-%d",dai_link->stream_name, codec_dai->name,
		get_dai_name(cpu_dai->type), num);

	if (codec_dai->playback.channels_min)
		playback = 1;
	if (codec_dai->capture.channels_min)
		capture = 1;

	ret = snd_pcm_new(codec->card, new_name, codec->pcm_devs++, playback,
		capture, &pcm);
	if (ret < 0) {
		printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
		kfree(rtd);
		return ret;
	}

	pcm->private_data = rtd;
	soc_pcm_ops.mmap = socdev->platform->pcm_ops->mmap;
	soc_pcm_ops.pointer = socdev->platform->pcm_ops->pointer;
	soc_pcm_ops.ioctl = socdev->platform->pcm_ops->ioctl;
	soc_pcm_ops.copy = socdev->platform->pcm_ops->copy;
	soc_pcm_ops.silence = socdev->platform->pcm_ops->silence;
	soc_pcm_ops.ack = socdev->platform->pcm_ops->ack;
	soc_pcm_ops.page = socdev->platform->pcm_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);

	ret = socdev->platform->pcm_new(codec->card, codec_dai, pcm);
	if (ret < 0) {
		printk(KERN_ERR "asoc: platform pcm constructor failed\n");
		kfree(rtd);
		return ret;
	}

	pcm->private_free = socdev->platform->pcm_free;
	printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
		cpu_dai->name);
	return ret;
}

/* codec register dump */
static ssize_t codec_reg_show(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct snd_soc_device *devdata = dev_get_drvdata(dev);
	struct snd_soc_codec *codec = devdata->codec;
	int i, step = 1, count = 0;

	if (!codec->reg_cache_size)
		return 0;

	if (codec->reg_cache_step)
		step = codec->reg_cache_step;

	count += sprintf(buf, "%s registers\n", codec->name);
	for(i = 0; i < codec->reg_cache_size; i += step)
		count += sprintf(buf + count, "%2x: %4x\n", i, codec->read(codec, i));

	return count;
}
static DEVICE_ATTR(codec_reg, 0444, codec_reg_show, NULL);

/**
 * snd_soc_new_ac97_codec - initailise AC97 device
 * @codec: audio codec
 * @ops: AC97 bus operations
 * @num: AC97 codec number
 *
 * Initialises AC97 codec resources for use by ad-hoc devices only.
 */
int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
	struct snd_ac97_bus_ops *ops, int num)
{
	mutex_lock(&codec->mutex);

	codec->ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
	if (codec->ac97 == NULL) {
		mutex_unlock(&codec->mutex);
		return -ENOMEM;
	}

	codec->ac97->bus = kzalloc(sizeof(struct snd_ac97_bus), GFP_KERNEL);
	if (codec->ac97->bus == NULL) {
		kfree(codec->ac97);
		codec->ac97 = NULL;
		mutex_unlock(&codec->mutex);
		return -ENOMEM;
	}

	codec->ac97->bus->ops = ops;
	codec->ac97->num = num;
	mutex_unlock(&codec->mutex);
	return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);

/**
 * snd_soc_free_ac97_codec - free AC97 codec device
 * @codec: audio codec
 *
 * Frees AC97 codec device resources.
 */
void snd_soc_free_ac97_codec(struct snd_soc_codec *codec)
{
	mutex_lock(&codec->mutex);
	kfree(codec->ac97->bus);
	kfree(codec->ac97);
	codec->ac97 = NULL;
	mutex_unlock(&codec->mutex);
}
EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec);

/**
 * snd_soc_update_bits - update codec register bits
 * @codec: audio codec
 * @reg: codec register
 * @mask: register mask
 * @value: new value
 *
 * Writes new register value.
 *
 * Returns 1 for change else 0.
 */
int snd_soc_update_bits(struct snd_soc_codec *codec, unsigned short reg,
				unsigned short mask, unsigned short value)
{
	int change;
	unsigned short old, new;

	mutex_lock(&io_mutex);
	old = snd_soc_read(codec, reg);
	new = (old & ~mask) | value;
	change = old != new;
	if (change)
		snd_soc_write(codec, reg, new);

	mutex_unlock(&io_mutex);
	return change;
}
EXPORT_SYMBOL_GPL(snd_soc_update_bits);

/**
 * snd_soc_test_bits - test register for change
 * @codec: audio codec
 * @reg: codec register
 * @mask: register mask
 * @value: new value
 *
 * Tests a register with a new value and checks if the new value is
 * different from the old value.
 *
 * Returns 1 for change else 0.
 */
int snd_soc_test_bits(struct snd_soc_codec *codec, unsigned short reg,
				unsigned short mask, unsigned short value)
{
	int change;
	unsigned short old, new;

	mutex_lock(&io_mutex);
	old = snd_soc_read(codec, reg);
	new = (old & ~mask) | value;
	change = old != new;
	mutex_unlock(&io_mutex);

	return change;
}
EXPORT_SYMBOL_GPL(snd_soc_test_bits);

/**
 * snd_soc_new_pcms - create new sound card and pcms
 * @socdev: the SoC audio device
 *
 * Create a new sound card based upon the codec and interface pcms.
 *
 * Returns 0 for success, else error.
 */
int snd_soc_new_pcms(struct snd_soc_device *socdev, int idx, const char *xid)
{
	struct snd_soc_codec *codec = socdev->codec;
	struct snd_soc_machine *machine = socdev->machine;
	int ret = 0, i;

	mutex_lock(&codec->mutex);

	/* register a sound card */
	codec->card = snd_card_new(idx, xid, codec->owner, 0);
	if (!codec->card) {
		printk(KERN_ERR "asoc: can't create sound card for codec %s\n",
			codec->name);
		mutex_unlock(&codec->mutex);