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authorMark Brown <broonie@opensource.wolfsonmicro.com>2010-02-01 18:46:10 +0000
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-02-03 18:03:37 +0000
commit8c961bcca1d10be4f2c06375eb561679167653a0 (patch)
tree568e0371807f25bf09d5948db1b798eb1ec49e01 /sound/soc/soc-cache.c
parent0f69d9782c6e6a7b0e60113a850845bc642c3f4e (diff)
downloadop-kernel-dev-8c961bcca1d10be4f2c06375eb561679167653a0.zip
op-kernel-dev-8c961bcca1d10be4f2c06375eb561679167653a0.tar.gz
ASoC: Allow CODECs to ask soc-cache to suppress physical writes
Currently the soc-cache code will always write to the device, meaning that we need the device to be powered and active at pretty much all times the system is active. Allowing cache only writes lays some groundwork for future enhancements to allow devices to be put into a full off state when the audio subsystem is idle. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'sound/soc/soc-cache.c')
-rw-r--r--sound/soc/soc-cache.c26
1 files changed, 24 insertions, 2 deletions
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 097e335..84b6916 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -38,6 +38,10 @@ static int snd_soc_4_12_write(struct snd_soc_codec *codec, unsigned int reg,
if (reg < codec->reg_cache_size)
cache[reg] = value;
+
+ if (codec->cache_only)
+ return 0;
+
ret = codec->hw_write(codec->control_data, data, 2);
if (ret == 2)
return 0;
@@ -100,6 +104,10 @@ static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg,
if (reg < codec->reg_cache_size)
cache[reg] = value;
+
+ if (codec->cache_only)
+ return 0;
+
ret = codec->hw_write(codec->control_data, data, 2);
if (ret == 2)
return 0;
@@ -153,6 +161,9 @@ static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
if (reg < codec->reg_cache_size)
cache[reg] = value;
+ if (codec->cache_only)
+ return 0;
+
if (codec->hw_write(codec->control_data, data, 2) == 2)
return 0;
else
@@ -181,6 +192,9 @@ static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
if (!snd_soc_codec_volatile_register(codec, reg))
reg_cache[reg] = value;
+ if (codec->cache_only)
+ return 0;
+
if (codec->hw_write(codec->control_data, data, 3) == 3)
return 0;
else
@@ -193,10 +207,14 @@ static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec,
u16 *cache = codec->reg_cache;
if (reg >= codec->reg_cache_size ||
- snd_soc_codec_volatile_register(codec, reg))
+ snd_soc_codec_volatile_register(codec, reg)) {
+ if (codec->cache_only)
+ return -EINVAL;
+
return codec->hw_read(codec, reg);
- else
+ } else {
return cache[reg];
+ }
}
#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
@@ -294,6 +312,10 @@ static int snd_soc_16_8_write(struct snd_soc_codec *codec, unsigned int reg,
reg &= 0xff;
if (reg < codec->reg_cache_size)
cache[reg] = value;
+
+ if (codec->cache_only)
+ return 0;
+
ret = codec->hw_write(codec->control_data, data, 3);
if (ret == 3)
return 0;
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