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496 lines
14 KiB
496 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// Copyright (C) 2013, Analog Devices Inc. |
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// Author: Lars-Peter Clausen <[email protected]> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/dmaengine.h> |
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#include <linux/slab.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/of.h> |
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#include <sound/dmaengine_pcm.h> |
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/* |
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* The platforms dmaengine driver does not support reporting the amount of |
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* bytes that are still left to transfer. |
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*/ |
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#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(31) |
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static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm, |
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struct snd_pcm_substream *substream) |
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{ |
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if (!pcm->chan[substream->stream]) |
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return NULL; |
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return pcm->chan[substream->stream]->device->dev; |
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} |
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/** |
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* snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback |
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* @substream: PCM substream |
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* @params: hw_params |
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* @slave_config: DMA slave config to prepare |
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* |
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* This function can be used as a generic prepare_slave_config callback for |
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* platforms which make use of the snd_dmaengine_dai_dma_data struct for their |
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* DAI DMA data. Internally the function will first call |
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* snd_hwparams_to_dma_slave_config to fill in the slave config based on the |
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* hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the |
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* remaining fields based on the DAI DMA data. |
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*/ |
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int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct snd_dmaengine_dai_dma_data *dma_data; |
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int ret; |
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if (rtd->num_cpus > 1) { |
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dev_err(rtd->dev, |
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"%s doesn't support Multi CPU yet\n", __func__); |
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return -EINVAL; |
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} |
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dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); |
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ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); |
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if (ret) |
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return ret; |
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snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data, |
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slave_config); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config); |
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static int dmaengine_pcm_hw_params(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params) |
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{ |
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component); |
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struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); |
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int (*prepare_slave_config)(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct dma_slave_config *slave_config); |
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struct dma_slave_config slave_config; |
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int ret; |
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memset(&slave_config, 0, sizeof(slave_config)); |
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if (!pcm->config) |
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prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config; |
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else |
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prepare_slave_config = pcm->config->prepare_slave_config; |
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if (prepare_slave_config) { |
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ret = prepare_slave_config(substream, params, &slave_config); |
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if (ret) |
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return ret; |
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ret = dmaengine_slave_config(chan, &slave_config); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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static int |
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dmaengine_pcm_set_runtime_hwparams(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component); |
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struct device *dma_dev = dmaengine_dma_dev(pcm, substream); |
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struct dma_chan *chan = pcm->chan[substream->stream]; |
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struct snd_dmaengine_dai_dma_data *dma_data; |
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struct snd_pcm_hardware hw; |
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if (rtd->num_cpus > 1) { |
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dev_err(rtd->dev, |
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"%s doesn't support Multi CPU yet\n", __func__); |
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return -EINVAL; |
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} |
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if (pcm->config && pcm->config->pcm_hardware) |
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return snd_soc_set_runtime_hwparams(substream, |
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pcm->config->pcm_hardware); |
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dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); |
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memset(&hw, 0, sizeof(hw)); |
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hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
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SNDRV_PCM_INFO_INTERLEAVED; |
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hw.periods_min = 2; |
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hw.periods_max = UINT_MAX; |
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hw.period_bytes_min = 256; |
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hw.period_bytes_max = dma_get_max_seg_size(dma_dev); |
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hw.buffer_bytes_max = SIZE_MAX; |
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hw.fifo_size = dma_data->fifo_size; |
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE) |
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hw.info |= SNDRV_PCM_INFO_BATCH; |
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/** |
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* FIXME: Remove the return value check to align with the code |
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* before adding snd_dmaengine_pcm_refine_runtime_hwparams |
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* function. |
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*/ |
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snd_dmaengine_pcm_refine_runtime_hwparams(substream, |
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dma_data, |
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&hw, |
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chan); |
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return snd_soc_set_runtime_hwparams(substream, &hw); |
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} |
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static int dmaengine_pcm_open(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component); |
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struct dma_chan *chan = pcm->chan[substream->stream]; |
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int ret; |
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ret = dmaengine_pcm_set_runtime_hwparams(component, substream); |
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if (ret) |
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return ret; |
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return snd_dmaengine_pcm_open(substream, chan); |
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} |
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static int dmaengine_pcm_close(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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return snd_dmaengine_pcm_close(substream); |
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} |
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static int dmaengine_pcm_trigger(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, int cmd) |
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{ |
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return snd_dmaengine_pcm_trigger(substream, cmd); |
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} |
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static struct dma_chan *dmaengine_pcm_compat_request_channel( |
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struct snd_soc_component *component, |
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struct snd_soc_pcm_runtime *rtd, |
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struct snd_pcm_substream *substream) |
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{ |
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component); |
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struct snd_dmaengine_dai_dma_data *dma_data; |
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dma_filter_fn fn = NULL; |
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if (rtd->num_cpus > 1) { |
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dev_err(rtd->dev, |
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"%s doesn't support Multi CPU yet\n", __func__); |
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return NULL; |
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} |
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dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); |
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if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0]) |
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return pcm->chan[0]; |
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if (pcm->config && pcm->config->compat_request_channel) |
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return pcm->config->compat_request_channel(rtd, substream); |
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if (pcm->config) |
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fn = pcm->config->compat_filter_fn; |
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return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data); |
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} |
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static bool dmaengine_pcm_can_report_residue(struct device *dev, |
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struct dma_chan *chan) |
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{ |
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struct dma_slave_caps dma_caps; |
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int ret; |
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ret = dma_get_slave_caps(chan, &dma_caps); |
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if (ret != 0) { |
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dev_warn(dev, "Failed to get DMA channel capabilities, falling back to period counting: %d\n", |
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ret); |
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return false; |
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} |
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if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR) |
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return false; |
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return true; |
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} |
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static int dmaengine_pcm_new(struct snd_soc_component *component, |
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struct snd_soc_pcm_runtime *rtd) |
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{ |
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component); |
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const struct snd_dmaengine_pcm_config *config = pcm->config; |
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struct device *dev = component->dev; |
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struct snd_pcm_substream *substream; |
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size_t prealloc_buffer_size; |
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size_t max_buffer_size; |
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unsigned int i; |
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if (config && config->prealloc_buffer_size) { |
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prealloc_buffer_size = config->prealloc_buffer_size; |
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max_buffer_size = config->pcm_hardware->buffer_bytes_max; |
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} else { |
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prealloc_buffer_size = 512 * 1024; |
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max_buffer_size = SIZE_MAX; |
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} |
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for_each_pcm_streams(i) { |
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substream = rtd->pcm->streams[i].substream; |
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if (!substream) |
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continue; |
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if (!pcm->chan[i] && config && config->chan_names[i]) |
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pcm->chan[i] = dma_request_slave_channel(dev, |
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config->chan_names[i]); |
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if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) { |
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pcm->chan[i] = dmaengine_pcm_compat_request_channel( |
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component, rtd, substream); |
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} |
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if (!pcm->chan[i]) { |
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dev_err(component->dev, |
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"Missing dma channel for stream: %d\n", i); |
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return -EINVAL; |
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} |
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snd_pcm_set_managed_buffer(substream, |
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SNDRV_DMA_TYPE_DEV_IRAM, |
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dmaengine_dma_dev(pcm, substream), |
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prealloc_buffer_size, |
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max_buffer_size); |
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if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i])) |
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pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE; |
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if (rtd->pcm->streams[i].pcm->name[0] == '\0') { |
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strscpy_pad(rtd->pcm->streams[i].pcm->name, |
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rtd->pcm->streams[i].pcm->id, |
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sizeof(rtd->pcm->streams[i].pcm->name)); |
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} |
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} |
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return 0; |
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} |
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static snd_pcm_uframes_t dmaengine_pcm_pointer( |
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struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component); |
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE) |
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return snd_dmaengine_pcm_pointer_no_residue(substream); |
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else |
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return snd_dmaengine_pcm_pointer(substream); |
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} |
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static int dmaengine_copy_user(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, |
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int channel, unsigned long hwoff, |
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void __user *buf, unsigned long bytes) |
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{ |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component); |
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int (*process)(struct snd_pcm_substream *substream, |
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int channel, unsigned long hwoff, |
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void *buf, unsigned long bytes) = pcm->config->process; |
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bool is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; |
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void *dma_ptr = runtime->dma_area + hwoff + |
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channel * (runtime->dma_bytes / runtime->channels); |
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int ret; |
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if (is_playback) |
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if (copy_from_user(dma_ptr, buf, bytes)) |
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return -EFAULT; |
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if (process) { |
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ret = process(substream, channel, hwoff, (__force void *)buf, bytes); |
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if (ret < 0) |
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return ret; |
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} |
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if (!is_playback) |
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if (copy_to_user(buf, dma_ptr, bytes)) |
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return -EFAULT; |
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return 0; |
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} |
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static const struct snd_soc_component_driver dmaengine_pcm_component = { |
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.name = SND_DMAENGINE_PCM_DRV_NAME, |
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.probe_order = SND_SOC_COMP_ORDER_LATE, |
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.open = dmaengine_pcm_open, |
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.close = dmaengine_pcm_close, |
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.hw_params = dmaengine_pcm_hw_params, |
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.trigger = dmaengine_pcm_trigger, |
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.pointer = dmaengine_pcm_pointer, |
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.pcm_construct = dmaengine_pcm_new, |
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}; |
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static const struct snd_soc_component_driver dmaengine_pcm_component_process = { |
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.name = SND_DMAENGINE_PCM_DRV_NAME, |
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.probe_order = SND_SOC_COMP_ORDER_LATE, |
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.open = dmaengine_pcm_open, |
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.close = dmaengine_pcm_close, |
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.hw_params = dmaengine_pcm_hw_params, |
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.trigger = dmaengine_pcm_trigger, |
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.pointer = dmaengine_pcm_pointer, |
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.copy_user = dmaengine_copy_user, |
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.pcm_construct = dmaengine_pcm_new, |
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}; |
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static const char * const dmaengine_pcm_dma_channel_names[] = { |
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[SNDRV_PCM_STREAM_PLAYBACK] = "tx", |
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[SNDRV_PCM_STREAM_CAPTURE] = "rx", |
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}; |
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static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm, |
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struct device *dev, const struct snd_dmaengine_pcm_config *config) |
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{ |
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unsigned int i; |
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const char *name; |
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struct dma_chan *chan; |
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if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || (!dev->of_node && |
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!(config && config->dma_dev && config->dma_dev->of_node))) |
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return 0; |
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if (config && config->dma_dev) { |
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/* |
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* If this warning is seen, it probably means that your Linux |
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* device structure does not match your HW device structure. |
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* It would be best to refactor the Linux device structure to |
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* correctly match the HW structure. |
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*/ |
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dev_warn(dev, "DMA channels sourced from device %s", |
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dev_name(config->dma_dev)); |
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dev = config->dma_dev; |
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} |
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for_each_pcm_streams(i) { |
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) |
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name = "rx-tx"; |
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else |
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name = dmaengine_pcm_dma_channel_names[i]; |
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if (config && config->chan_names[i]) |
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name = config->chan_names[i]; |
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chan = dma_request_chan(dev, name); |
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if (IS_ERR(chan)) { |
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/* |
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* Only report probe deferral errors, channels |
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* might not be present for devices that |
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* support only TX or only RX. |
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*/ |
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if (PTR_ERR(chan) == -EPROBE_DEFER) |
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return -EPROBE_DEFER; |
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pcm->chan[i] = NULL; |
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} else { |
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pcm->chan[i] = chan; |
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} |
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) |
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break; |
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} |
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) |
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pcm->chan[1] = pcm->chan[0]; |
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return 0; |
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} |
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static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm) |
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{ |
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unsigned int i; |
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for_each_pcm_streams(i) { |
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if (!pcm->chan[i]) |
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continue; |
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dma_release_channel(pcm->chan[i]); |
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) |
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break; |
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} |
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} |
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/** |
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* snd_dmaengine_pcm_register - Register a dmaengine based PCM device |
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* @dev: The parent device for the PCM device |
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* @config: Platform specific PCM configuration |
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* @flags: Platform specific quirks |
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*/ |
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int snd_dmaengine_pcm_register(struct device *dev, |
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const struct snd_dmaengine_pcm_config *config, unsigned int flags) |
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{ |
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const struct snd_soc_component_driver *driver; |
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struct dmaengine_pcm *pcm; |
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int ret; |
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pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
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if (!pcm) |
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return -ENOMEM; |
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#ifdef CONFIG_DEBUG_FS |
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pcm->component.debugfs_prefix = "dma"; |
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#endif |
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pcm->config = config; |
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pcm->flags = flags; |
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ret = dmaengine_pcm_request_chan_of(pcm, dev, config); |
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if (ret) |
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goto err_free_dma; |
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if (config && config->process) |
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driver = &dmaengine_pcm_component_process; |
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else |
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driver = &dmaengine_pcm_component; |
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ret = snd_soc_component_initialize(&pcm->component, driver, dev); |
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if (ret) |
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goto err_free_dma; |
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ret = snd_soc_add_component(&pcm->component, NULL, 0); |
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if (ret) |
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goto err_free_dma; |
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return 0; |
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err_free_dma: |
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dmaengine_pcm_release_chan(pcm); |
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kfree(pcm); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register); |
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/** |
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* snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device |
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* @dev: Parent device the PCM was register with |
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* |
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* Removes a dmaengine based PCM device previously registered with |
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* snd_dmaengine_pcm_register. |
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*/ |
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void snd_dmaengine_pcm_unregister(struct device *dev) |
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{ |
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struct snd_soc_component *component; |
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struct dmaengine_pcm *pcm; |
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component = snd_soc_lookup_component(dev, SND_DMAENGINE_PCM_DRV_NAME); |
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if (!component) |
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return; |
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pcm = soc_component_to_pcm(component); |
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snd_soc_unregister_component_by_driver(dev, component->driver); |
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dmaengine_pcm_release_chan(pcm); |
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kfree(pcm); |
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} |
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister); |
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MODULE_LICENSE("GPL");
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