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73 lines
2.5 KiB
Diff
73 lines
2.5 KiB
Diff
From a09a8ebce7251e2a42668bd5ae57c12ed24fdca8 Mon Sep 17 00:00:00 2001
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From: Daniel Matuschek <daniel@hifiberry.com>
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Date: Sat, 31 Jan 2015 16:07:56 +0100
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Subject: [PATCH 084/114] Add a parameter to turn off SPDIF output if no audio
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is playing
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This patch adds the paramater auto_shutdown_output to the kernel module.
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Default behaviour of the module is the same, but when auto_shutdown_output
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is set to 1, the SPDIF oputput will shutdown if no stream is playing.
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---
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sound/soc/bcm/hifiberry_digi.c | 29 ++++++++++++++++++++++++++++-
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1 file changed, 28 insertions(+), 1 deletion(-)
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--- a/sound/soc/bcm/hifiberry_digi.c
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+++ b/sound/soc/bcm/hifiberry_digi.c
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@@ -26,6 +26,11 @@
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#include "../codecs/wm8804.h"
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+static short int auto_shutdown_output = 0;
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+module_param(auto_shutdown_output, short, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
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+MODULE_PARM_DESC(auto_shutdown_output, "Shutdown SP/DIF output if playback is stopped");
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+
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+
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static int samplerate=44100;
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static int snd_rpi_hifiberry_digi_init(struct snd_soc_pcm_runtime *rtd)
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@@ -38,6 +43,25 @@ static int snd_rpi_hifiberry_digi_init(s
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return 0;
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}
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+static int snd_rpi_hifiberry_digi_startup(struct snd_pcm_substream *substream) {
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+ /* turn on digital output */
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+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+ struct snd_soc_codec *codec = rtd->codec;
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+ snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00);
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+ return 0;
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+}
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+
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+static void snd_rpi_hifiberry_digi_shutdown(struct snd_pcm_substream *substream) {
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+ /* turn off output */
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+ if (auto_shutdown_output) {
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+ /* turn off output */
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+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+ struct snd_soc_codec *codec = rtd->codec;
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+ snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c);
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+ }
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+}
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+
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+
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static int snd_rpi_hifiberry_digi_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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@@ -70,7 +94,8 @@ static int snd_rpi_hifiberry_digi_hw_par
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break;
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default:
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dev_err(substream->pcm->dev,
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- "Failed to set WM8804 SYSCLK, unsupported samplerate\n");
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+ "Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
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+ samplerate);
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}
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snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
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@@ -96,6 +121,8 @@ static int snd_rpi_hifiberry_digi_hw_par
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/* machine stream operations */
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static struct snd_soc_ops snd_rpi_hifiberry_digi_ops = {
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.hw_params = snd_rpi_hifiberry_digi_hw_params,
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+ .startup = snd_rpi_hifiberry_digi_startup,
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+ .shutdown = snd_rpi_hifiberry_digi_shutdown,
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};
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static struct snd_soc_dai_link snd_rpi_hifiberry_digi_dai[] = {
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