[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / soc / soc-generic-dmaengine-pcm.c

/*
 *  Copyright (C) 2013, Analog Devices Inc.
 *	Author: Lars-Peter Clausen <lars@metafoo.de>
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>

#include <sound/dmaengine_pcm.h>

struct dmaengine_pcm {
	struct dma_chan *chan[SNDRV_PCM_STREAM_CAPTURE + 1];
	const struct snd_dmaengine_pcm_config *config;
	struct snd_soc_platform platform;
	unsigned int flags;
};

static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
{
	return container_of(p, struct dmaengine_pcm, platform);
}

/**
 * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
 * @substream: PCM substream
 * @params: hw_params
 * @slave_config: DMA slave config to prepare
 *
 * This function can be used as a generic prepare_slave_config callback for
 * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
 * DAI DMA data. Internally the function will first call
 * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
 * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
 * remaining fields based on the DAI DMA data.
 */
int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_dmaengine_dai_dma_data *dma_data;
	int ret;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
	if (ret)
		return ret;

	snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
		slave_config);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);

static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
	struct dma_slave_config slave_config;
	int ret;

	if (pcm->config->prepare_slave_config) {
		ret = pcm->config->prepare_slave_config(substream, params,
				&slave_config);
		if (ret)
			return ret;

		ret = dmaengine_slave_config(chan, &slave_config);
		if (ret)
			return ret;
	}

	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
}

static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct dma_chan *chan = pcm->chan[substream->stream];
	int ret;

	ret = snd_soc_set_runtime_hwparams(substream,
				pcm->config->pcm_hardware);
	if (ret)
		return ret;

	return snd_dmaengine_pcm_open(substream, chan);
}

static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
	struct snd_pcm_substream *substream)
{
	if (!pcm->chan[substream->stream])
		return NULL;

	return pcm->chan[substream->stream]->device->dev;
}

static void dmaengine_pcm_free(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static struct dma_chan *dmaengine_pcm_compat_request_channel(
	struct snd_soc_pcm_runtime *rtd,
	struct snd_pcm_substream *substream)
{
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);

	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
		return pcm->chan[0];

	if (pcm->config->compat_request_channel)
		return pcm->config->compat_request_channel(rtd, substream);

	return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
		snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
}

static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	const struct snd_dmaengine_pcm_config *config = pcm->config;
	struct snd_pcm_substream *substream;
	unsigned int i;
	int ret;

	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
		substream = rtd->pcm->streams[i].substream;
		if (!substream)
			continue;

		if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
			pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
				substream);
		}

		if (!pcm->chan[i]) {
			dev_err(rtd->platform->dev,
				"Missing dma channel for stream: %d\n", i);
			ret = -EINVAL;
			goto err_free;
		}

		ret = snd_pcm_lib_preallocate_pages(substream,
				SNDRV_DMA_TYPE_DEV,
				dmaengine_dma_dev(pcm, substream),
				config->prealloc_buffer_size,
				config->pcm_hardware->buffer_bytes_max);
		if (ret)
			goto err_free;
	}

	return 0;

err_free:
	dmaengine_pcm_free(rtd->pcm);
	return ret;
}

static const struct snd_pcm_ops dmaengine_pcm_ops = {
	.open		= dmaengine_pcm_open,
	.close		= snd_dmaengine_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= dmaengine_pcm_hw_params,
	.hw_free	= snd_pcm_lib_free_pages,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= snd_dmaengine_pcm_pointer,
};

static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
	.ops		= &dmaengine_pcm_ops,
	.pcm_new	= dmaengine_pcm_new,
	.pcm_free	= dmaengine_pcm_free,
	.probe_order	= SND_SOC_COMP_ORDER_LATE,
};

static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
	.open		= dmaengine_pcm_open,
	.close		= snd_dmaengine_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= dmaengine_pcm_hw_params,
	.hw_free	= snd_pcm_lib_free_pages,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= snd_dmaengine_pcm_pointer_no_residue,
};

static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
	.ops		= &dmaengine_no_residue_pcm_ops,
	.pcm_new	= dmaengine_pcm_new,
	.pcm_free	= dmaengine_pcm_free,
	.probe_order	= SND_SOC_COMP_ORDER_LATE,
};

static const char * const dmaengine_pcm_dma_channel_names[] = {
	[SNDRV_PCM_STREAM_PLAYBACK] = "tx",
	[SNDRV_PCM_STREAM_CAPTURE] = "rx",
};

static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
	struct device *dev)
{
	unsigned int i;

	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node)
		return;

	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
		pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
		pcm->chan[1] = pcm->chan[0];
	} else {
		for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
			pcm->chan[i] = dma_request_slave_channel(dev,
					dmaengine_pcm_dma_channel_names[i]);
		}
	}
}

/**
 * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
 * @dev: The parent device for the PCM device
 * @config: Platform specific PCM configuration
 * @flags: Platform specific quirks
 */
int snd_dmaengine_pcm_register(struct device *dev,
	const struct snd_dmaengine_pcm_config *config, unsigned int flags)
{
	struct dmaengine_pcm *pcm;

	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
	if (!pcm)
		return -ENOMEM;

	pcm->config = config;
	pcm->flags = flags;

	dmaengine_pcm_request_chan_of(pcm, dev);

	if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
		return snd_soc_add_platform(dev, &pcm->platform,
				&dmaengine_no_residue_pcm_platform);
	else
		return snd_soc_add_platform(dev, &pcm->platform,
				&dmaengine_pcm_platform);
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);

/**
 * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
 * @dev: Parent device the PCM was register with
 *
 * Removes a dmaengine based PCM device previously registered with
 * snd_dmaengine_pcm_register.
 */
void snd_dmaengine_pcm_unregister(struct device *dev)
{
	struct snd_soc_platform *platform;
	struct dmaengine_pcm *pcm;
	unsigned int i;

	platform = snd_soc_lookup_platform(dev);
	if (!platform)
		return;

	pcm = soc_platform_to_pcm(platform);

	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
		if (pcm->chan[i]) {
			dma_release_channel(pcm->chan[i]);
			if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
				break;
		}
	}

	snd_soc_remove_platform(platform);
	kfree(pcm);
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);

MODULE_LICENSE("GPL");
Commit	Line	Data
28c4468b LPC	1	/*
	2	* Copyright (C) 2013, Analog Devices Inc.
	3	* Author: Lars-Peter Clausen <lars@metafoo.de>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version.
	9	*
	10	* You should have received a copy of the GNU General Public License along
	11	* with this program; if not, write to the Free Software Foundation, Inc.,
	12	* 675 Mass Ave, Cambridge, MA 02139, USA.
	13	*
	14	*/
	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/dmaengine.h>
	18	#include <linux/slab.h>
	19	#include <sound/pcm.h>
	20	#include <sound/pcm_params.h>
	21	#include <sound/soc.h>
	22	#include <linux/dma-mapping.h>
	23	#include <linux/of.h>
28c4468b LPC	24
	25	#include <sound/dmaengine_pcm.h>
	26
	27	struct dmaengine_pcm {
	28	struct dma_chan *chan[SNDRV_PCM_STREAM_CAPTURE + 1];
	29	const struct snd_dmaengine_pcm_config *config;
	30	struct snd_soc_platform platform;
d1e1406c	31	unsigned int flags;
28c4468b LPC	32	};
	33
	34	static struct dmaengine_pcm soc_platform_to_pcm(struct snd_soc_platform p)
	35	{
	36	return container_of(p, struct dmaengine_pcm, platform);
	37	}
	38
	39	/**
	40	* snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
	41	* @substream: PCM substream
	42	* @params: hw_params
	43	* @slave_config: DMA slave config to prepare
	44	*
	45	* This function can be used as a generic prepare_slave_config callback for
	46	* platforms which make use of the snd_dmaengine_dai_dma_data struct for their
	47	* DAI DMA data. Internally the function will first call
	48	* snd_hwparams_to_dma_slave_config to fill in the slave config based on the
	49	* hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
	50	* remaining fields based on the DAI DMA data.
	51	*/
	52	int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
	53	struct snd_pcm_hw_params params, struct dma_slave_config slave_config)
	54	{
	55	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	56	struct snd_dmaengine_dai_dma_data *dma_data;
	57	int ret;
	58
	59	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	60
	61	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
	62	if (ret)
	63	return ret;
	64
	65	snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
	66	slave_config);
	67
	68	return 0;
	69	}
	70	EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
	71
	72	static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
	73	struct snd_pcm_hw_params *params)
	74	{
	75	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	76	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	77	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
	78	struct dma_slave_config slave_config;
	79	int ret;
	80
	81	if (pcm->config->prepare_slave_config) {
	82	ret = pcm->config->prepare_slave_config(substream, params,
	83	&slave_config);
	84	if (ret)
	85	return ret;
	86
	87	ret = dmaengine_slave_config(chan, &slave_config);
	88	if (ret)
	89	return ret;
	90	}
	91
	92	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	93	}
	94
	95	static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
96	{
97	struct snd_soc_pcm_runtime *rtd = substream->private_data;
98	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
99	struct dma_chan *chan = pcm->chan[substream->stream];
100	int ret;
101
102	ret = snd_soc_set_runtime_hwparams(substream,
103	pcm->config->pcm_hardware);
104	if (ret)
105	return ret;
106
107	return snd_dmaengine_pcm_open(substream, chan);
108	}
109
110	static struct device dmaengine_dma_dev(struct dmaengine_pcm pcm,
111	struct snd_pcm_substream *substream)
112	{
113	if (!pcm->chan[substream->stream])
114	return NULL;
115
116	return pcm->chan[substream->stream]->device->dev;
117	}
118
119	static void dmaengine_pcm_free(struct snd_pcm *pcm)
120	{
121	snd_pcm_lib_preallocate_free_for_all(pcm);
122	}
123
c999836d LPC	124	static struct dma_chan *dmaengine_pcm_compat_request_channel(
	125	struct snd_soc_pcm_runtime *rtd,
	126	struct snd_pcm_substream *substream)
	127	{
	128	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	129
d1e1406c LPC	130	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
	131	return pcm->chan[0];
	132
c999836d LPC	133	if (pcm->config->compat_request_channel)
	134	return pcm->config->compat_request_channel(rtd, substream);
	135
	136	return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
	137	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
	138	}
	139
28c4468b LPC	140	static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
	141	{
	142	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	143	const struct snd_dmaengine_pcm_config *config = pcm->config;
	144	struct snd_pcm_substream *substream;
	145	unsigned int i;
	146	int ret;
	147
	148	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
	149	substream = rtd->pcm->streams[i].substream;
	150	if (!substream)
	151	continue;
	152
d1e1406c	153	if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
c999836d LPC	154	pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
	155	substream);
	156	}
	157
28c4468b LPC	158	if (!pcm->chan[i]) {
	159	dev_err(rtd->platform->dev,
	160	"Missing dma channel for stream: %d\n", i);
	161	ret = -EINVAL;
	162	goto err_free;
	163	}
	164
	165	ret = snd_pcm_lib_preallocate_pages(substream,
	166	SNDRV_DMA_TYPE_DEV,
	167	dmaengine_dma_dev(pcm, substream),
	168	config->prealloc_buffer_size,
	169	config->pcm_hardware->buffer_bytes_max);
	170	if (ret)
	171	goto err_free;
	172	}
	173
	174	return 0;
	175
	176	err_free:
	177	dmaengine_pcm_free(rtd->pcm);
	178	return ret;
	179	}
	180
	181	static const struct snd_pcm_ops dmaengine_pcm_ops = {
	182	.open = dmaengine_pcm_open,
	183	.close = snd_dmaengine_pcm_close,
	184	.ioctl = snd_pcm_lib_ioctl,
	185	.hw_params = dmaengine_pcm_hw_params,
	186	.hw_free = snd_pcm_lib_free_pages,
	187	.trigger = snd_dmaengine_pcm_trigger,
	188	.pointer = snd_dmaengine_pcm_pointer,
	189	};
	190
	191	static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
	192	.ops = &dmaengine_pcm_ops,
	193	.pcm_new = dmaengine_pcm_new,
	194	.pcm_free = dmaengine_pcm_free,
c999836d	195	.probe_order = SND_SOC_COMP_ORDER_LATE,
28c4468b LPC	196	};
28c4468b LPC	197
610f7800 LPC	198	static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
	199	.open = dmaengine_pcm_open,
	200	.close = snd_dmaengine_pcm_close,
	201	.ioctl = snd_pcm_lib_ioctl,
	202	.hw_params = dmaengine_pcm_hw_params,
	203	.hw_free = snd_pcm_lib_free_pages,
	204	.trigger = snd_dmaengine_pcm_trigger,
	205	.pointer = snd_dmaengine_pcm_pointer_no_residue,
	206	};
	207
	208	static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
	209	.ops = &dmaengine_no_residue_pcm_ops,
	210	.pcm_new = dmaengine_pcm_new,
	211	.pcm_free = dmaengine_pcm_free,
	212	.probe_order = SND_SOC_COMP_ORDER_LATE,
	213	};
	214
28c4468b LPC	215	static const char * const dmaengine_pcm_dma_channel_names[] = {
	216	[SNDRV_PCM_STREAM_PLAYBACK] = "tx",
	217	[SNDRV_PCM_STREAM_CAPTURE] = "rx",
	218	};
	219
d1e1406c	220	static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
6f1fd93e	221	struct device *dev)
d1e1406c LPC	222	{
	223	unsigned int i;
	224
6f1fd93e	225	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) \|\| !dev->of_node)
d1e1406c LPC	226	return;
	227
	228	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
6f1fd93e	229	pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
d1e1406c LPC	230	pcm->chan[1] = pcm->chan[0];
	231	} else {
	232	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
6f1fd93e	233	pcm->chan[i] = dma_request_slave_channel(dev,
d1e1406c LPC	234	dmaengine_pcm_dma_channel_names[i]);
	235	}
	236	}
	237	}
	238
28c4468b LPC	239	/**
	240	* snd_dmaengine_pcm_register - Register a dmaengine based PCM device
	241	* @dev: The parent device for the PCM device
	242	* @config: Platform specific PCM configuration
	243	* @flags: Platform specific quirks
	244	*/
	245	int snd_dmaengine_pcm_register(struct device *dev,
	246	const struct snd_dmaengine_pcm_config *config, unsigned int flags)
	247	{
	248	struct dmaengine_pcm *pcm;
28c4468b	249
28c4468b LPC	250	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
	251	if (!pcm)
	252	return -ENOMEM;
	253
	254	pcm->config = config;
d1e1406c	255	pcm->flags = flags;
28c4468b	256
6f1fd93e	257	dmaengine_pcm_request_chan_of(pcm, dev);
28c4468b	258
610f7800 LPC	259	if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
	260	return snd_soc_add_platform(dev, &pcm->platform,
	261	&dmaengine_no_residue_pcm_platform);
	262	else
	263	return snd_soc_add_platform(dev, &pcm->platform,
28c4468b LPC	264	&dmaengine_pcm_platform);
	265	}
	266	EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
	267
	268	/**
	269	* snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
	270	* @dev: Parent device the PCM was register with
	271	*
	272	* Removes a dmaengine based PCM device previously registered with
	273	* snd_dmaengine_pcm_register.
	274	*/
	275	void snd_dmaengine_pcm_unregister(struct device *dev)
	276	{
	277	struct snd_soc_platform *platform;
	278	struct dmaengine_pcm *pcm;
	279	unsigned int i;
	280
	281	platform = snd_soc_lookup_platform(dev);
	282	if (!platform)
	283	return;
	284
	285	pcm = soc_platform_to_pcm(platform);
	286
	287	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
d1e1406c	288	if (pcm->chan[i]) {
28c4468b	289	dma_release_channel(pcm->chan[i]);
d1e1406c LPC	290	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
	291	break;
	292	}
28c4468b LPC	293	}
	294
	295	snd_soc_remove_platform(platform);
	296	kfree(pcm);
	297	}
	298	EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
	299
	300	MODULE_LICENSE("GPL");