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staging: most: add multi channel support to sound AIM 

This patch adds 5.1 surround configuration with subbuffer cross-check,
when establishing a link to the core. For the sake of simplicity, only
one specific channel configuration is allowed.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2015-09-28 17:18:47 +02:00 коммит произвёл Greg Kroah-Hartman
Родитель ccfbaee033
Коммит 8e4a0ef17f
1 изменённых файлов: 25 добавлений и 2 удалений
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27
drivers/staging/most/aim-sound/sound.c
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@ -19,6 +19,7 @@
#include <linux/init.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <mostcore.h>
@ -75,7 +76,7 @@ static struct snd_pcm_hardware pcm_hardware_template = {
.rate_min = 48000,
.rate_max = 48000,
.channels_min = 1,
.channels_max = 8,
.channels_max = 1,
};
#define swap16(val) ( \
@ -355,10 +356,18 @@ static int pcm_close(struct snd_pcm_substream *substream)
static int pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
int ret;
pr_info("pcm_hw_params()\n");
return snd_pcm_lib_alloc_vmalloc_buffer(substream,
if ((params_channels(hw_params) > pcm_hardware_template.channels_max) ||
(params_channels(hw_params) < pcm_hardware_template.channels_min) ||
!(params_format(hw_params) != pcm_hardware_template.formats))
return -EINVAL;
ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
return ret;
}
/**
@ -511,20 +520,34 @@ static int audio_set_pcm_format(char *pcm_format,
if (cfg->subbuffer_size != 4)
goto error;
pr_info("PCM format is 16-bit stereo\n");
pcm_hardware_template.channels_min = 2;
pcm_hardware_template.channels_max = 2;
pcm_hardware_template.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S16_BE;
} else if (!strcmp(pcm_format, "2x24")) {
if (cfg->subbuffer_size != 6)
goto error;
pr_info("PCM format is 24-bit stereo\n");
pcm_hardware_template.channels_min = 2;
pcm_hardware_template.channels_max = 2;
pcm_hardware_template.formats = SNDRV_PCM_FMTBIT_S24_3LE |
SNDRV_PCM_FMTBIT_S24_3BE;
} else if (!strcmp(pcm_format, "2x32")) {
if (cfg->subbuffer_size != 8)
goto error;
pr_info("PCM format is 32-bit stereo\n");
pcm_hardware_template.channels_min = 2;
pcm_hardware_template.channels_max = 2;
pcm_hardware_template.formats = SNDRV_PCM_FMTBIT_S32_LE |
SNDRV_PCM_FMTBIT_S32_BE;
} else if (!strcmp(pcm_format, "6x16")) {
if (cfg->subbuffer_size != 12)
goto error;
pr_info("PCM format is 16-bit 5.1 multi channel\n");
pcm_hardware_template.channels_min = 6;
pcm_hardware_template.channels_max = 6;
pcm_hardware_template.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S16_BE;
} else {
pr_err("PCM format %s not supported\n", pcm_format);
return -EIO;