ASoC: sprd: Add Spreadtrum audio compress offload support (cce13969) · Commits · 戴 / test

sound/soc/sprd/Kconfig

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		config SND_SOC_SPRD
		tristate "SoC Audio for the Spreadtrum SoC chips"
		depends on ARCH_SPRD \|\| COMPILE_TEST
		select SND_SOC_COMPRESS
		help
		Say Y or M if you want to add support for codecs attached to
		the Spreadtrum SoCs' Audio interfaces.

sound/soc/sprd/Makefile

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		# SPDX-License-Identifier: GPL-2.0
		# Spreadtrum Audio Support

		obj-$(CONFIG_SND_SOC_SPRD) += sprd-pcm-dma.o
		obj-$(CONFIG_SND_SOC_SPRD) += sprd-pcm-dma.o sprd-pcm-compress.o

sound/soc/sprd/sprd-pcm-compress.c

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		// SPDX-License-Identifier: GPL-2.0
		// Copyright (C) 2019 Spreadtrum Communications Inc.

		#include <linux/dma-mapping.h>
		#include <linux/dmaengine.h>
		#include <linux/dma/sprd-dma.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <sound/pcm.h>
		#include <sound/pcm_params.h>
		#include <sound/soc.h>
		#include <sound/compress_driver.h>

		#include "sprd-pcm-dma.h"

		#define SPRD_COMPR_DMA_CHANS 2

		/* Default values if userspace does not set */
		#define SPRD_COMPR_MIN_FRAGMENT_SIZE SZ_8K
		#define SPRD_COMPR_MAX_FRAGMENT_SIZE SZ_128K
		#define SPRD_COMPR_MIN_NUM_FRAGMENTS 4
		#define SPRD_COMPR_MAX_NUM_FRAGMENTS 64

		/* DSP FIFO size */
		#define SPRD_COMPR_MCDT_EMPTY_WMK 0
		#define SPRD_COMPR_MCDT_FIFO_SIZE 512

		/* Stage 0 IRAM buffer size definition */
		#define SPRD_COMPR_IRAM_BUF_SIZE SZ_32K
		#define SPRD_COMPR_IRAM_INFO_SIZE (sizeof(struct sprd_compr_playinfo))
		#define SPRD_COMPR_IRAM_LINKLIST_SIZE (1024 - SPRD_COMPR_IRAM_INFO_SIZE)
		#define SPRD_COMPR_IRAM_SIZE (SPRD_COMPR_IRAM_BUF_SIZE + \
		SPRD_COMPR_IRAM_INFO_SIZE + \
		SPRD_COMPR_IRAM_LINKLIST_SIZE)

		/* Stage 1 DDR buffer size definition */
		#define SPRD_COMPR_AREA_BUF_SIZE SZ_2M
		#define SPRD_COMPR_AREA_LINKLIST_SIZE 1024
		#define SPRD_COMPR_AREA_SIZE (SPRD_COMPR_AREA_BUF_SIZE + \
		SPRD_COMPR_AREA_LINKLIST_SIZE)

		struct sprd_compr_dma {
		struct dma_chan *chan;
		struct dma_async_tx_descriptor *desc;
		dma_cookie_t cookie;
		dma_addr_t phys;
		void *virt;
		int trans_len;
		};

		/*
		* The Spreadtrum Audio compress offload mode will use 2-stage DMA transfer to
		* save power. That means we can request 2 dma channels, one for source channel,
		* and another one for destination channel. Once the source channel's transaction
		* is done, it will trigger the destination channel's transaction automatically
		* by hardware signal.
		*
		* For 2-stage DMA transfer, we can allocate 2 buffers: IRAM buffer (always
		* power-on) and DDR buffer. The source channel will transfer data from IRAM
		* buffer to the DSP fifo to decoding/encoding, once IRAM buffer is empty by
		* transferring done, the destination channel will start to transfer data from
		* DDR buffer to IRAM buffer.
		*
		* Since the DSP fifo is only 512B, IRAM buffer is allocated by 32K, and DDR
		* buffer is larger to 2M. That means only the IRAM 32k data is transferred
		* done, we can wake up the AP system to transfer data from DDR to IRAM, and
		* other time the AP system can be suspended to save power.
		*/
		struct sprd_compr_stream {
		struct snd_compr_stream *cstream;
		struct sprd_compr_ops *compr_ops;
		struct sprd_compr_dma dma[SPRD_COMPR_DMA_CHANS];

		/* DMA engine channel number */
		int num_channels;

		/* Stage 0 IRAM buffer */
		struct snd_dma_buffer iram_buffer;
		/* Stage 1 DDR buffer */
		struct snd_dma_buffer compr_buffer;

		/* DSP play information IRAM buffer */
		dma_addr_t info_phys;
		void *info_area;
		int info_size;

		/* Data size copied to IRAM buffer */
		int copied_total;
		/* Total received data size from userspace */
		int received_total;
		/* Stage 0 IRAM buffer received data size */
		int received_stage0;
		/* Stage 1 DDR buffer received data size */
		int received_stage1;
		/* Stage 1 DDR buffer pointer */
		int stage1_pointer;
		};

		static int sprd_platform_compr_trigger(struct snd_compr_stream *cstream,
		int cmd);

		static void sprd_platform_compr_drain_notify(void *arg)
		{
		struct snd_compr_stream *cstream = arg;
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;

		memset(stream->info_area, 0, sizeof(struct sprd_compr_playinfo));

		if (cstream)
		snd_compr_drain_notify(cstream);
		}

		static void sprd_platform_compr_dma_complete(void *data)
		{
		struct snd_compr_stream *cstream = data;
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;
		struct sprd_compr_dma *dma = &stream->dma[1];

		/* Update data size copied to IRAM buffer */
		stream->copied_total += dma->trans_len;
		if (stream->copied_total > stream->received_total)
		stream->copied_total = stream->received_total;

		snd_compr_fragment_elapsed(cstream);
		}

		static int sprd_platform_compr_dma_config(struct snd_compr_stream *cstream,
		struct snd_compr_params *params,
		int channel)
		{
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;
		struct snd_soc_pcm_runtime *rtd = cstream->private_data;
		struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
		struct device *dev = component->dev;
		struct sprd_compr_data *data = snd_soc_dai_get_drvdata(rtd->cpu_dai);
		struct sprd_pcm_dma_params *dma_params = data->dma_params;
		struct sprd_compr_dma *dma = &stream->dma[channel];
		struct dma_slave_config config = { };
		struct sprd_dma_linklist link = { };
		enum dma_transfer_direction dir;
		struct scatterlist sg, sgt;
		enum dma_slave_buswidth bus_width;
		int period, period_cnt, sg_num = 2;
		dma_addr_t src_addr, dst_addr;
		unsigned long flags;
		int ret, j;

		if (!dma_params) {
		dev_err(dev, "no dma parameters setting\n");
		return -EINVAL;
		}

		dma->chan = dma_request_slave_channel(dev,
		dma_params->chan_name[channel]);
		if (!dma->chan) {
		dev_err(dev, "failed to request dma channel\n");
		return -ENODEV;
		}

		sgt = sg = devm_kcalloc(dev, sg_num, sizeof(*sg), GFP_KERNEL);
		if (!sg) {
		ret = -ENOMEM;
		goto sg_err;
		}

		switch (channel) {
		case 0:
		bus_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
		period = (SPRD_COMPR_MCDT_FIFO_SIZE - SPRD_COMPR_MCDT_EMPTY_WMK) * 4;
		period_cnt = params->buffer.fragment_size / period;
		src_addr = stream->iram_buffer.addr;
		dst_addr = dma_params->dev_phys[channel];
		flags = SPRD_DMA_FLAGS(SPRD_DMA_SRC_CHN1,
		SPRD_DMA_TRANS_DONE_TRG,
		SPRD_DMA_FRAG_REQ,
		SPRD_DMA_TRANS_INT);
		break;

		case 1:
		bus_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
		period = params->buffer.fragment_size;
		period_cnt = params->buffer.fragments;
		src_addr = stream->compr_buffer.addr;
		dst_addr = stream->iram_buffer.addr;
		flags = SPRD_DMA_FLAGS(SPRD_DMA_DST_CHN1,
		SPRD_DMA_TRANS_DONE_TRG,
		SPRD_DMA_FRAG_REQ,
		SPRD_DMA_TRANS_INT);
		break;

		default:
		ret = -EINVAL;
		goto config_err;
		}

		dma->trans_len = period * period_cnt;

		config.src_maxburst = period;
		config.src_addr_width = bus_width;
		config.dst_addr_width = bus_width;
		if (cstream->direction == SND_COMPRESS_PLAYBACK) {
		config.src_addr = src_addr;
		config.dst_addr = dst_addr;
		dir = DMA_MEM_TO_DEV;
		} else {
		config.src_addr = dst_addr;
		config.dst_addr = src_addr;
		dir = DMA_DEV_TO_MEM;
		}

		sg_init_table(sgt, sg_num);
		for (j = 0; j < sg_num; j++, sgt++) {
		sg_dma_len(sgt) = dma->trans_len;
		sg_dma_address(sgt) = dst_addr;
		}

		/*
		* Configure the link-list address for the DMA engine link-list
		* mode.
		*/
		link.virt_addr = (unsigned long)dma->virt;
		link.phy_addr = dma->phys;

		ret = dmaengine_slave_config(dma->chan, &config);
		if (ret) {
		dev_err(dev,
		"failed to set slave configuration: %d\n", ret);
		goto config_err;
		}

		/*
		* We configure the DMA request mode, interrupt mode, channel
		* mode and channel trigger mode by the flags.
		*/
		dma->desc = dma->chan->device->device_prep_slave_sg(dma->chan, sg,
		sg_num, dir,
		flags, &link);
		if (!dma->desc) {
		dev_err(dev, "failed to prepare slave sg\n");
		ret = -ENOMEM;
		goto config_err;
		}

		/* Only channel 1 transfer can wake up the AP system. */
		if (!params->no_wake_mode && channel == 1) {
		dma->desc->callback = sprd_platform_compr_dma_complete;
		dma->desc->callback_param = cstream;
		}

		devm_kfree(dev, sg);

		return 0;

		config_err:
		devm_kfree(dev, sg);
		sg_err:
		dma_release_channel(dma->chan);
		return ret;
		}

		static int sprd_platform_compr_set_params(struct snd_compr_stream *cstream,
		struct snd_compr_params *params)
		{
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;
		struct snd_soc_pcm_runtime *rtd = cstream->private_data;
		struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
		struct device *dev = component->dev;
		struct sprd_compr_params compr_params = { };
		int ret;

		/*
		* Configure the DMA engine 2-stage transfer mode. Channel 1 set as the
		* destination channel, and channel 0 set as the source channel, that
		* means once the source channel's transaction is done, it will trigger
		* the destination channel's transaction automatically.
		*/
		ret = sprd_platform_compr_dma_config(cstream, params, 1);
		if (ret) {
		dev_err(dev, "faied to config stage 1 DMA: %d\n", ret);
		return ret;
		}

		ret = sprd_platform_compr_dma_config(cstream, params, 0);
		if (ret) {
		dev_err(dev, "faied to config stage 0 DMA: %d\n", ret);
		goto config_err;
		}

		compr_params.direction = cstream->direction;
		compr_params.sample_rate = params->codec.sample_rate;
		compr_params.channels = stream->num_channels;
		compr_params.info_phys = stream->info_phys;
		compr_params.info_size = stream->info_size;
		compr_params.rate = params->codec.bit_rate;
		compr_params.format = params->codec.id;

		ret = stream->compr_ops->set_params(cstream->direction, &compr_params);
		if (ret) {
		dev_err(dev, "failed to set parameters: %d\n", ret);
		goto params_err;
		}

		return 0;

		params_err:
		dma_release_channel(stream->dma[0].chan);
		config_err:
		dma_release_channel(stream->dma[1].chan);
		return ret;
		}

		static int sprd_platform_compr_open(struct snd_compr_stream *cstream)
		{
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct snd_soc_pcm_runtime *rtd = cstream->private_data;
		struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
		struct device *dev = component->dev;
		struct sprd_compr_data *data = snd_soc_dai_get_drvdata(rtd->cpu_dai);
		struct sprd_compr_stream *stream;
		struct sprd_compr_callback cb;
		int stream_id = cstream->direction, ret;

		ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
		if (ret)
		return ret;

		stream = devm_kzalloc(dev, sizeof(*stream), GFP_KERNEL);
		if (!stream)
		return -ENOMEM;

		stream->cstream = cstream;
		stream->num_channels = 2;
		stream->compr_ops = data->ops;

		/*
		* Allocate the stage 0 IRAM buffer size, including the DMA 0
		* link-list size and play information of DSP address size.
		*/
		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_IRAM, dev,
		SPRD_COMPR_IRAM_SIZE, &stream->iram_buffer);
		if (ret < 0)
		goto err_iram;

		/* Use to save link-list configuration for DMA 0. */
		stream->dma[0].virt = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE;
		stream->dma[0].phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE;

		/* Use to update the current data offset of DSP. */
		stream->info_phys = stream->iram_buffer.addr + SPRD_COMPR_IRAM_SIZE +
		SPRD_COMPR_IRAM_LINKLIST_SIZE;
		stream->info_area = stream->iram_buffer.area + SPRD_COMPR_IRAM_SIZE +
		SPRD_COMPR_IRAM_LINKLIST_SIZE;
		stream->info_size = SPRD_COMPR_IRAM_INFO_SIZE;

		/*
		* Allocate the stage 1 DDR buffer size, including the DMA 1 link-list
		* size.
		*/
		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev,
		SPRD_COMPR_AREA_SIZE, &stream->compr_buffer);
		if (ret < 0)
		goto err_compr;

		/* Use to save link-list configuration for DMA 1. */
		stream->dma[1].virt = stream->compr_buffer.area + SPRD_COMPR_AREA_SIZE;
		stream->dma[1].phys = stream->compr_buffer.addr + SPRD_COMPR_AREA_SIZE;

		cb.drain_notify = sprd_platform_compr_drain_notify;
		cb.drain_data = cstream;
		ret = stream->compr_ops->open(stream_id, &cb);
		if (ret) {
		dev_err(dev, "failed to open compress platform: %d\n", ret);
		goto err_open;
		}

		runtime->private_data = stream;
		return 0;

		err_open:
		snd_dma_free_pages(&stream->compr_buffer);
		err_compr:
		snd_dma_free_pages(&stream->iram_buffer);
		err_iram:
		devm_kfree(dev, stream);

		return ret;
		}

		static int sprd_platform_compr_free(struct snd_compr_stream *cstream)
		{
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;
		struct snd_soc_pcm_runtime *rtd = cstream->private_data;
		struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
		struct device *dev = component->dev;
		int stream_id = cstream->direction, i;

		for (i = 0; i < stream->num_channels; i++) {
		struct sprd_compr_dma *dma = &stream->dma[i];

		if (dma->chan) {
		dma_release_channel(dma->chan);
		dma->chan = NULL;
		}
		}

		snd_dma_free_pages(&stream->compr_buffer);
		snd_dma_free_pages(&stream->iram_buffer);

		stream->compr_ops->close(stream_id);

		devm_kfree(dev, stream);
		return 0;
		}

		static int sprd_platform_compr_trigger(struct snd_compr_stream *cstream,
		int cmd)
		{
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;
		struct snd_soc_pcm_runtime *rtd = cstream->private_data;
		struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
		struct device *dev = component->dev;
		int channels = stream->num_channels, ret = 0, i;
		int stream_id = cstream->direction;

		if (cstream->direction != SND_COMPRESS_PLAYBACK) {
		dev_err(dev, "unsupported compress direction\n");
		return -EINVAL;
		}

		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
		for (i = channels - 1; i >= 0; i--) {
		struct sprd_compr_dma *dma = &stream->dma[i];

		if (!dma->desc)
		continue;

		dma->cookie = dmaengine_submit(dma->desc);
		ret = dma_submit_error(dma->cookie);
		if (ret) {
		dev_err(dev, "failed to submit request: %d\n",
		ret);
		return ret;
		}
		}

		for (i = channels - 1; i >= 0; i--) {
		struct sprd_compr_dma *dma = &stream->dma[i];

		if (dma->chan)
		dma_async_issue_pending(dma->chan);
		}

		ret = stream->compr_ops->start(stream_id);
		break;

		case SNDRV_PCM_TRIGGER_STOP:
		for (i = channels - 1; i >= 0; i--) {
		struct sprd_compr_dma *dma = &stream->dma[i];

		if (dma->chan)
		dmaengine_terminate_async(dma->chan);
		}

		stream->copied_total = 0;
		stream->stage1_pointer = 0;
		stream->received_total = 0;
		stream->received_stage0 = 0;
		stream->received_stage1 = 0;

		ret = stream->compr_ops->stop(stream_id);
		break;

		case SNDRV_PCM_TRIGGER_SUSPEND:
		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		for (i = channels - 1; i >= 0; i--) {
		struct sprd_compr_dma *dma = &stream->dma[i];

		if (dma->chan)
		dmaengine_pause(dma->chan);
		}

		ret = stream->compr_ops->pause(stream_id);
		break;

		case SNDRV_PCM_TRIGGER_RESUME:
		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		for (i = channels - 1; i >= 0; i--) {
		struct sprd_compr_dma *dma = &stream->dma[i];

		if (dma->chan)
		dmaengine_resume(dma->chan);
		}

		ret = stream->compr_ops->pause_release(stream_id);
		break;

		case SND_COMPR_TRIGGER_PARTIAL_DRAIN:
		case SND_COMPR_TRIGGER_DRAIN:
		ret = stream->compr_ops->drain(stream->received_total);
		break;

		default:
		ret = -EINVAL;
		break;
		}

		return ret;
		}

		static int sprd_platform_compr_pointer(struct snd_compr_stream *cstream,
		struct snd_compr_tstamp *tstamp)
		{
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;
		struct sprd_compr_playinfo *info =
		(struct sprd_compr_playinfo *)stream->info_area;

		tstamp->copied_total = stream->copied_total;
		tstamp->pcm_io_frames = info->current_data_offset;

		return 0;
		}

		static int sprd_platform_compr_copy(struct snd_compr_stream *cstream,
		char __user *buf, size_t count)
		{
		struct snd_compr_runtime *runtime = cstream->runtime;
		struct sprd_compr_stream *stream = runtime->private_data;
		int avail_bytes, data_count = count;
		void *dst;

		/*
		* We usually set fragment size as 32K, and the stage 0 IRAM buffer
		* size is 32K too. So if now the received data size of the stage 0
		* IRAM buffer is less than 32K, that means we have some available
		* spaces for the stage 0 IRAM buffer.
		*/
		if (stream->received_stage0 < runtime->fragment_size) {
		avail_bytes = runtime->fragment_size - stream->received_stage0;
		dst = stream->iram_buffer.area + stream->received_stage0;

		if (avail_bytes >= data_count) {
		/*
		* Copy data to the stage 0 IRAM buffer directly if
		* spaces are enough.
		*/
		if (copy_from_user(dst, buf, data_count))
		return -EFAULT;

		stream->received_stage0 += data_count;
		stream->copied_total += data_count;
		goto copy_done;
		} else {
		/*
		* If the data count is larger than the available spaces
		* of the the stage 0 IRAM buffer, we should copy one
		* partial data to the stage 0 IRAM buffer, and copy
		* the left to the stage 1 DDR buffer.
		*/
		if (copy_from_user(dst, buf, avail_bytes))
		return -EFAULT;

		data_count -= avail_bytes;
		stream->received_stage0 += avail_bytes;
		stream->copied_total += avail_bytes;
		buf += avail_bytes;
		}
		}

		/*
		* Copy data to the stage 1 DDR buffer if no spaces for the stage 0 IRAM
		* buffer.
		*/
		dst = stream->compr_buffer.area + stream->stage1_pointer;
		if (data_count < stream->compr_buffer.bytes - stream->stage1_pointer) {
		if (copy_from_user(dst, buf, data_count))
		return -EFAULT;

		stream->stage1_pointer += data_count;
		} else {
		avail_bytes = stream->compr_buffer.bytes - stream->stage1_pointer;

		if (copy_from_user(dst, buf, avail_bytes))
		return -EFAULT;

		if (copy_from_user(stream->compr_buffer.area, buf + avail_bytes,
		data_count - avail_bytes))
		return -EFAULT;

		stream->stage1_pointer = data_count - avail_bytes;
		}

		stream->received_stage1 += data_count;

		copy_done:
		/* Update the copied data size. */
		stream->received_total += count;
		return count;
		}

		static int sprd_platform_compr_get_caps(struct snd_compr_stream *cstream,
		struct snd_compr_caps *caps)
		{
		caps->direction = cstream->direction;
		caps->min_fragment_size = SPRD_COMPR_MIN_FRAGMENT_SIZE;
		caps->max_fragment_size = SPRD_COMPR_MAX_FRAGMENT_SIZE;
		caps->min_fragments = SPRD_COMPR_MIN_NUM_FRAGMENTS;
		caps->max_fragments = SPRD_COMPR_MAX_NUM_FRAGMENTS;
		caps->num_codecs = 2;
		caps->codecs[0] = SND_AUDIOCODEC_MP3;
		caps->codecs[1] = SND_AUDIOCODEC_AAC;

		return 0;
		}

		static int
		sprd_platform_compr_get_codec_caps(struct snd_compr_stream *cstream,
		struct snd_compr_codec_caps *codec)
		{
		switch (codec->codec) {
		case SND_AUDIOCODEC_MP3:
		codec->num_descriptors = 2;
		codec->descriptor[0].max_ch = 2;
		codec->descriptor[0].bit_rate[0] = 320;
		codec->descriptor[0].bit_rate[1] = 128;
		codec->descriptor[0].num_bitrates = 2;
		codec->descriptor[0].profiles = 0;
		codec->descriptor[0].modes = SND_AUDIOCHANMODE_MP3_STEREO;
		codec->descriptor[0].formats = 0;
		break;

		case SND_AUDIOCODEC_AAC:
		codec->num_descriptors = 2;
		codec->descriptor[1].max_ch = 2;
		codec->descriptor[1].bit_rate[0] = 320;
		codec->descriptor[1].bit_rate[1] = 128;
		codec->descriptor[1].num_bitrates = 2;
		codec->descriptor[1].profiles = 0;
		codec->descriptor[1].modes = 0;
		codec->descriptor[1].formats = 0;
		break;

		default:
		return -EINVAL;
		}

		return 0;
		}

		const struct snd_compr_ops sprd_platform_compr_ops = {
		.open = sprd_platform_compr_open,
		.free = sprd_platform_compr_free,
		.set_params = sprd_platform_compr_set_params,
		.trigger = sprd_platform_compr_trigger,
		.pointer = sprd_platform_compr_pointer,
		.copy = sprd_platform_compr_copy,
		.get_caps = sprd_platform_compr_get_caps,
		.get_codec_caps = sprd_platform_compr_get_codec_caps,
		};

		MODULE_DESCRIPTION("Spreadtrum ASoC Compress Platform Driver");
		MODULE_LICENSE("GPL v2");
		MODULE_ALIAS("platform:compress-platform");

sound/soc/sprd/sprd-pcm-dma.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -13,7 +13,6 @@

		#include "sprd-pcm-dma.h"

		#define DRV_NAME "sprd_pcm_dma"
		#define SPRD_PCM_DMA_LINKLIST_SIZE 64
		#define SPRD_PCM_DMA_BRUST_LEN 640

		@@ -524,6 +523,7 @@ static void sprd_pcm_free(struct snd_pcm *pcm)
		static const struct snd_soc_component_driver sprd_soc_component = {
		.name = DRV_NAME,
		.ops = &sprd_pcm_ops,
		.compr_ops = &sprd_platform_compr_ops,
		.pcm_new = sprd_pcm_new,
		.pcm_free = sprd_pcm_free,
		};

sound/soc/sprd/sprd-pcm-dma.h

+43 −0

Original line number	Diff line number	Diff line
		@@ -3,8 +3,11 @@
		#ifndef __SPRD_PCM_DMA_H
		#define __SPRD_PCM_DMA_H

		#define DRV_NAME "sprd_pcm_dma"
		#define SPRD_PCM_CHANNEL_MAX 2

		extern const struct snd_compr_ops sprd_platform_compr_ops;

		struct sprd_pcm_dma_params {
		dma_addr_t dev_phys[SPRD_PCM_CHANNEL_MAX];
		u32 datawidth[SPRD_PCM_CHANNEL_MAX];
		@@ -12,4 +15,44 @@ struct sprd_pcm_dma_params {
		const char *chan_name[SPRD_PCM_CHANNEL_MAX];
		};

		struct sprd_compr_playinfo {
		int total_time;
		int current_time;
		int total_data_length;
		int current_data_offset;
		};

		struct sprd_compr_params {
		u32 direction;
		u32 rate;
		u32 sample_rate;
		u32 channels;
		u32 format;
		u32 period;
		u32 periods;
		u32 info_phys;
		u32 info_size;
		};

		struct sprd_compr_callback {
		void (drain_notify)(void data);
		void *drain_data;
		};

		struct sprd_compr_ops {
		int (open)(int str_id, struct sprd_compr_callback cb);
		int (*close)(int str_id);
		int (*start)(int str_id);
		int (*stop)(int str_id);
		int (*pause)(int str_id);
		int (*pause_release)(int str_id);
		int (*drain)(int received_total);
		int (set_params)(int str_id, struct sprd_compr_params params);
		};

		struct sprd_compr_data {
		struct sprd_compr_ops *ops;
		struct sprd_pcm_dma_params *dma_params;
		};

		#endif /* __SPRD_PCM_DMA_H */

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