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From a09a8ebce7251e2a42668bd5ae57c12ed24fdca8 Mon Sep 17 00:00:00 2001
From: Daniel Matuschek <daniel@hifiberry.com>
Date: Sat, 31 Jan 2015 16:07:56 +0100
Subject: [PATCH 084/114] Add a parameter to turn off SPDIF output if no audio
is playing
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.
---
sound/soc/bcm/hifiberry_digi.c | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/sound/soc/bcm/hifiberry_digi.c b/sound/soc/bcm/hifiberry_digi.c
index 76af8a6..b0e3d28 100644
--- a/sound/soc/bcm/hifiberry_digi.c
+++ b/sound/soc/bcm/hifiberry_digi.c
@@ -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(substream->pcm->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[] = {
--
1.8.3.2
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