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>

include/sound/soc.h

@@ -423,6 +423,7 @@ struct snd_soc_codec {
 	short reg_cache_step;
 
 	unsigned int idle_bias_off:1; /* Use BIAS_OFF instead of STANDBY */
+	unsigned int cache_only:1;  /* Suppress writes to hardware */
 
 	/* dapm */
 	u32 pop_time;

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;