cregit-Linux how code gets into the kernel

Release 4.7 sound/soc/soc-generic-dmaengine-pcm.c

Directory: sound/soc
 *  Copyright (C) 2013, Analog Devices Inc.
 *      Author: Lars-Peter Clausen <>
 *  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>

 * The platforms dmaengine driver does not support reporting the amount of
 * bytes that are still left to transfer.


struct dmaengine_pcm {
struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 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); }


lars-peter clausenlars-peter clausen24100.00%1100.00%

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; }


lars-peter clausenlars-peter clausen47100.00%1100.00%

/** * 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; }


lars-peter clausenlars-peter clausen78100.00%1100.00%

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); int (*prepare_slave_config)(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); struct dma_slave_config slave_config; int ret; memset(&slave_config, 0, sizeof(slave_config)); if (!pcm->config) prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config; else prepare_slave_config = pcm->config->prepare_slave_config; if (prepare_slave_config) { ret = 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)); }


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lee joneslee jones138.02%133.33%

static int dmaengine_pcm_set_runtime_hwparams(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 device *dma_dev = dmaengine_dma_dev(pcm, substream); struct dma_chan *chan = pcm->chan[substream->stream]; struct snd_dmaengine_dai_dma_data *dma_data; struct dma_slave_caps dma_caps; struct snd_pcm_hardware hw; u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); int i, ret; if (pcm->config && pcm->config->pcm_hardware) return snd_soc_set_runtime_hwparams(substream, pcm->config->pcm_hardware); dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); memset(&hw, 0, sizeof(hw)); = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED; hw.periods_min = 2; hw.periods_max = UINT_MAX; hw.period_bytes_min = 256; hw.period_bytes_max = dma_get_max_seg_size(dma_dev); hw.buffer_bytes_max = SIZE_MAX; hw.fifo_size = dma_data->fifo_size; if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE) |= SNDRV_PCM_INFO_BATCH; ret = dma_get_slave_caps(chan, &dma_caps); if (ret == 0) { if (dma_caps.cmd_pause) |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME; if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT) |= SNDRV_PCM_INFO_BATCH; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) addr_widths = dma_caps.dst_addr_widths; else addr_widths = dma_caps.src_addr_widths; } /* * If SND_DMAENGINE_PCM_DAI_FLAG_PACK is set keep * hw.formats set to 0, meaning no restrictions are in place. * In this case it's the responsibility of the DAI driver to * provide the supported format information. */ if (!(dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK)) /* * Prepare formats mask for valid/allowed sample types. If the * dma does not have support for the given physical word size, * it needs to be masked out so user space can not use the * format which produces corrupted audio. * In case the dma driver does not implement the slave_caps the * default assumption is that it supports 1, 2 and 4 bytes * widths. */ for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) { int bits = snd_pcm_format_physical_width(i); /* * Enable only samples with DMA supported physical * widths */ switch (bits) { case 8: case 16: case 24: case 32: case 64: if (addr_widths & (1 << (bits / 8))) hw.formats |= (1LL << i); break; default: /* Unsupported types */ break; } } return snd_soc_set_runtime_hwparams(substream, &hw); }


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peter ujfalusipeter ujfalusi11230.35%112.50%
matthias reichlmatthias reichl143.79%112.50%
maxime ripardmaxime ripard10.27%112.50%

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 = dmaengine_pcm_set_runtime_hwparams(substream); if (ret) return ret; return snd_dmaengine_pcm_open(substream, chan); }


lars-peter clausenlars-peter clausen71100.00%2100.00%

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); struct snd_dmaengine_dai_dma_data *dma_data; dma_filter_fn fn = NULL; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0]) return pcm->chan[0]; if (pcm->config && pcm->config->compat_request_channel) return pcm->config->compat_request_channel(rtd, substream); if (pcm->config) fn = pcm->config->compat_filter_fn; return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data); }


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xiubo lixiubo li2217.74%125.00%
mark brownmark brown1814.52%125.00%

static bool dmaengine_pcm_can_report_residue(struct device *dev, struct dma_chan *chan) { struct dma_slave_caps dma_caps; int ret; ret = dma_get_slave_caps(chan, &dma_caps); if (ret != 0) { dev_warn(dev, "Failed to get DMA channel capabilities, falling back to period counting: %d\n", ret); return false; } if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR) return false; return true; }


lars-peter clausenlars-peter clausen67100.00%2100.00%

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 device *dev = rtd->platform->dev; struct snd_dmaengine_dai_dma_data *dma_data; struct snd_pcm_substream *substream; size_t prealloc_buffer_size; size_t max_buffer_size; unsigned int i; int ret; if (config && config->prealloc_buffer_size) { prealloc_buffer_size = config->prealloc_buffer_size; max_buffer_size = config->pcm_hardware->buffer_bytes_max; } else { prealloc_buffer_size = 512 * 1024; max_buffer_size = SIZE_MAX; } for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { substream = rtd->pcm->streams[i].substream; if (!substream) continue; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) pcm->chan[i] = dma_request_slave_channel(dev, dma_data->chan_name); 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); return -EINVAL; } ret = snd_pcm_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV_IRAM, dmaengine_dma_dev(pcm, substream), prealloc_buffer_size, max_buffer_size); if (ret) return ret; if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i])) pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE; } return 0; }


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mark brownmark brown6120.54%111.11%
nicolin chennicolin chen10.34%111.11%

static snd_pcm_uframes_t dmaengine_pcm_pointer( struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE) return snd_dmaengine_pcm_pointer_no_residue(substream); else return snd_dmaengine_pcm_pointer(substream); }


lars-peter clausenlars-peter clausen53100.00%2100.00%

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 = dmaengine_pcm_pointer, }; static const struct snd_soc_platform_driver dmaengine_pcm_platform = { .component_driver = { .probe_order = SND_SOC_COMP_ORDER_LATE, }, .ops = &dmaengine_pcm_ops, .pcm_new = dmaengine_pcm_new, }; static const char * const dmaengine_pcm_dma_channel_names[] = { [SNDRV_PCM_STREAM_PLAYBACK] = "tx", [SNDRV_PCM_STREAM_CAPTURE] = "rx", };
static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm, struct device *dev, const struct snd_dmaengine_pcm_config *config) { unsigned int i; const char *name; struct dma_chan *chan; if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT | SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) || !dev->of_node) return 0; if (config && config->dma_dev) { /* * If this warning is seen, it probably means that your Linux * device structure does not match your HW device structure. * It would be best to refactor the Linux device structure to * correctly match the HW structure. */ dev_warn(dev, "DMA channels sourced from device %s", dev_name(config->dma_dev)); dev = config->dma_dev; } for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) name = "rx-tx"; else name = dmaengine_pcm_dma_channel_names[i]; if (config && config->chan_names[i]) name = config->chan_names[i]; chan = dma_request_slave_channel_reason(dev, name); if (IS_ERR(chan)) { if (PTR_ERR(chan) == -EPROBE_DEFER) return -EPROBE_DEFER; pcm->chan[i] = NULL; } else { pcm->chan[i] = chan; } if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) break; } if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) pcm->chan[1] = pcm->chan[0]; return 0; }


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lars-peter clausenlars-peter clausen5825.11%114.29%
shawn guoshawn guo52.16%114.29%
mark brownmark brown41.73%114.29%
xiubo lixiubo li41.73%114.29%

static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm) { unsigned int i; for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { if (!pcm->chan[i]) continue; dma_release_channel(pcm->chan[i]); if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) break; } }


stephen warrenstephen warren60100.00%1100.00%

/** * 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; int ret; pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); if (!pcm) return -ENOMEM; pcm->config = config; pcm->flags = flags; ret = dmaengine_pcm_request_chan_of(pcm, dev, config); if (ret) goto err_free_dma; ret = snd_soc_add_platform(dev, &pcm->platform, &dmaengine_pcm_platform); if (ret) goto err_free_dma; return 0; err_free_dma: dmaengine_pcm_release_chan(pcm); kfree(pcm); return ret; }


lars-peter clausenlars-peter clausen8167.50%457.14%
stephen warrenstephen warren3932.50%342.86%

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; platform = snd_soc_lookup_platform(dev); if (!platform) return; pcm = soc_platform_to_pcm(platform); snd_soc_remove_platform(platform); dmaengine_pcm_release_chan(pcm); kfree(pcm); }


lars-peter clausenlars-peter clausen5192.73%150.00%
stephen warrenstephen warren47.27%150.00%

EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister); MODULE_LICENSE("GPL");

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stephen warrenstephen warren26313.56%414.81%
peter ujfalusipeter ujfalusi1125.77%13.70%
mark brownmark brown834.28%27.41%
xiubo lixiubo li261.34%27.41%
matthias reichlmatthias reichl140.72%13.70%
lee joneslee jones130.67%13.70%
shawn guoshawn guo50.26%13.70%
maxime ripardmaxime ripard10.05%13.70%
nicolin chennicolin chen10.05%13.70%
takashi iwaitakashi iwai10.05%13.70%
Directory: sound/soc
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