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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/sound/soc/soc-dmaengine-pcm.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/sound/soc/soc-dmaengine-pcm.c')
-rw-r--r--ANDROID_3.4.5/sound/soc/soc-dmaengine-pcm.c288
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diff --git a/ANDROID_3.4.5/sound/soc/soc-dmaengine-pcm.c b/ANDROID_3.4.5/sound/soc/soc-dmaengine-pcm.c
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--- a/ANDROID_3.4.5/sound/soc/soc-dmaengine-pcm.c
+++ /dev/null
@@ -1,288 +0,0 @@
-/*
- * Copyright (C) 2012, Analog Devices Inc.
- * Author: Lars-Peter Clausen <lars@metafoo.de>
- *
- * Based on:
- * imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
- * mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc.
- * ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
- * Copyright (C) 2006 Applied Data Systems
- *
- * 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 <sound/dmaengine_pcm.h>
-
-struct dmaengine_pcm_runtime_data {
- struct dma_chan *dma_chan;
-
- unsigned int pos;
-
- void *data;
-};
-
-static inline struct dmaengine_pcm_runtime_data *substream_to_prtd(
- const struct snd_pcm_substream *substream)
-{
- return substream->runtime->private_data;
-}
-
-/**
- * snd_dmaengine_pcm_set_data - Set dmaengine substream private data
- * @substream: PCM substream
- * @data: Data to set
- */
-void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data)
-{
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
-
- prtd->data = data;
-}
-EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_data);
-
-/**
- * snd_dmaengine_pcm_get_data - Get dmaeinge substream private data
- * @substream: PCM substream
- *
- * Returns the data previously set with snd_dmaengine_pcm_set_data
- */
-void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream)
-{
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
-
- return prtd->data;
-}
-EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_data);
-
-struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
-{
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
-
- return prtd->dma_chan;
-}
-EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_chan);
-
-/**
- * snd_hwparams_to_dma_slave_config - Convert hw_params to dma_slave_config
- * @substream: PCM substream
- * @params: hw_params
- * @slave_config: DMA slave config
- *
- * This function can be used to initialize a dma_slave_config from a substream
- * and hw_params in a dmaengine based PCM driver implementation.
- */
-int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
- const struct snd_pcm_hw_params *params,
- struct dma_slave_config *slave_config)
-{
- enum dma_slave_buswidth buswidth;
-
- switch (params_format(params)) {
- case SNDRV_PCM_FORMAT_S8:
- buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
- break;
- case SNDRV_PCM_FORMAT_S16_LE:
- buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
- break;
- case SNDRV_PCM_FORMAT_S18_3LE:
- case SNDRV_PCM_FORMAT_S20_3LE:
- case SNDRV_PCM_FORMAT_S24_LE:
- case SNDRV_PCM_FORMAT_S32_LE:
- buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
- break;
- default:
- return -EINVAL;
- }
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- slave_config->direction = DMA_MEM_TO_DEV;
- slave_config->dst_addr_width = buswidth;
- } else {
- slave_config->direction = DMA_DEV_TO_MEM;
- slave_config->src_addr_width = buswidth;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config);
-
-static void dmaengine_pcm_dma_complete(void *arg)
-{
- struct snd_pcm_substream *substream = arg;
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
-
- prtd->pos += snd_pcm_lib_period_bytes(substream);
- if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
- prtd->pos = 0;
-
- snd_pcm_period_elapsed(substream);
-}
-
-static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
-{
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
- struct dma_chan *chan = prtd->dma_chan;
- struct dma_async_tx_descriptor *desc;
- enum dma_transfer_direction direction;
-
- direction = snd_pcm_substream_to_dma_direction(substream);
-
- prtd->pos = 0;
- desc = dmaengine_prep_dma_cyclic(chan,
- substream->runtime->dma_addr,
- snd_pcm_lib_buffer_bytes(substream),
- snd_pcm_lib_period_bytes(substream), direction);
-
- if (!desc)
- return -ENOMEM;
-
- desc->callback = dmaengine_pcm_dma_complete;
- desc->callback_param = substream;
- dmaengine_submit(desc);
-
- return 0;
-}
-
-/**
- * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
- * @substream: PCM substream
- * @cmd: Trigger command
- *
- * Returns 0 on success, a negative error code otherwise.
- *
- * This function can be used as the PCM trigger callback for dmaengine based PCM
- * driver implementations.
- */
-int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
-{
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
- int ret;
-
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- ret = dmaengine_pcm_prepare_and_submit(substream);
- if (ret)
- return ret;
- dma_async_issue_pending(prtd->dma_chan);
- break;
- case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- dmaengine_resume(prtd->dma_chan);
- break;
- case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- dmaengine_pause(prtd->dma_chan);
- break;
- case SNDRV_PCM_TRIGGER_STOP:
- dmaengine_terminate_all(prtd->dma_chan);
- break;
- default:
- return -EINVAL;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger);
-
-/**
- * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
- * @substream: PCM substream
- *
- * This function can be used as the PCM pointer callback for dmaengine based PCM
- * driver implementations.
- */
-snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
-{
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
- return bytes_to_frames(substream->runtime, prtd->pos);
-}
-EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
-
-static int dmaengine_pcm_request_channel(struct dmaengine_pcm_runtime_data *prtd,
- dma_filter_fn filter_fn, void *filter_data)
-{
- dma_cap_mask_t mask;
-
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- dma_cap_set(DMA_CYCLIC, mask);
- prtd->dma_chan = dma_request_channel(mask, filter_fn, filter_data);
-
- if (!prtd->dma_chan)
- return -ENXIO;
-
- return 0;
-}
-
-/**
- * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
- * @substream: PCM substream
- * @filter_fn: Filter function used to request the DMA channel
- * @filter_data: Data passed to the DMA filter function
- *
- * Returns 0 on success, a negative error code otherwise.
- *
- * This function will request a DMA channel using the passed filter function and
- * data. The function should usually be called from the pcm open callback.
- *
- * Note that this function will use private_data field of the substream's
- * runtime. So it is not availabe to your pcm driver implementation. If you need
- * to keep additional data attached to a substream use
- * snd_dmaeinge_pcm_{set,get}_data.
- */
-int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
- dma_filter_fn filter_fn, void *filter_data)
-{
- struct dmaengine_pcm_runtime_data *prtd;
- int ret;
-
- ret = snd_pcm_hw_constraint_integer(substream->runtime,
- SNDRV_PCM_HW_PARAM_PERIODS);
- if (ret < 0)
- return ret;
-
- prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
- if (!prtd)
- return -ENOMEM;
-
- ret = dmaengine_pcm_request_channel(prtd, filter_fn, filter_data);
- if (ret < 0) {
- kfree(prtd);
- return ret;
- }
-
- substream->runtime->private_data = prtd;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
-
-/**
- * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
- * @substream: PCM substream
- */
-int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
-{
- struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
-
- dma_release_channel(prtd->dma_chan);
- kfree(prtd);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);