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Add a parameter to turn off SPDIF output if no audio is playing

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This patch adds the paramater auto_shutdown_output to the kernel module.
Default behaviour of the module is the same, but when auto_shutdown_output
is set to 1, the SPDIF oputput will shutdown if no stream is playing.
This commit is contained in:
Daniel Matuschek
2015-01-31 16:07:56 +01:00
committed by popcornmix
parent 32bee38e1f
commit 7358633426
1 changed files with 28 additions and 1 deletions
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29
sound/soc/bcm/hifiberry_digi.c
View File

@@ -26,6 +26,11 @@
#include "../codecs/wm8804.h"
static short int auto_shutdown_output = 0;
module_param(auto_shutdown_output, short, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
MODULE_PARM_DESC(auto_shutdown_output, "Shutdown SP/DIF output if playback is stopped");
static int samplerate=44100;
static int snd_rpi_hifiberry_digi_init(struct snd_soc_pcm_runtime *rtd)
@@ -38,6 +43,25 @@ static int snd_rpi_hifiberry_digi_init(struct snd_soc_pcm_runtime *rtd)
return 0;
}
static int snd_rpi_hifiberry_digi_startup(struct snd_pcm_substream *substream) {
/* turn on digital output */
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_codec *codec = rtd->codec;
snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00);
return 0;
}
static void snd_rpi_hifiberry_digi_shutdown(struct snd_pcm_substream *substream) {
/* turn off output */
if (auto_shutdown_output) {
/* turn off output */
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_codec *codec = rtd->codec;
snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c);
}
}
static int snd_rpi_hifiberry_digi_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
@@ -70,7 +94,8 @@ static int snd_rpi_hifiberry_digi_hw_params(struct snd_pcm_substream *substream,
break;
default:
dev_err(codec->dev,
"Failed to set WM8804 SYSCLK, unsupported samplerate\n");
"Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
samplerate);
}
snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
@@ -96,6 +121,8 @@ static int snd_rpi_hifiberry_digi_hw_params(struct snd_pcm_substream *substream,
/* machine stream operations */
static struct snd_soc_ops snd_rpi_hifiberry_digi_ops = {
.hw_params = snd_rpi_hifiberry_digi_hw_params,
.startup = snd_rpi_hifiberry_digi_startup,
.shutdown = snd_rpi_hifiberry_digi_shutdown,
};
static struct snd_soc_dai_link snd_rpi_hifiberry_digi_dai[] = {