staging: greybus: audio: Cleanup junk codec registers

Dummy codec register were initially added while populating dummy codec
mixer controls until module topology parser was available. Now, these
dummy registers are nowhere used and thus can be safely removed.

Since ASoC framework requires a valid callback for both read & write
register APIS, currently empty placeholders are kept to avoid panic.

Later, register mapping logic can be defined:
1. Assuming fixed number of maximum modules connected and register bits
corresponds to basic info of each module OR
2. With a logic to dynamically grow register_cache_size based on codec
modules added/removed.
Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
Acked-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/audio_codec.c

@@ -1026,47 +1026,16 @@ static int gbcodec_remove(struct snd_soc_codec *codec)
 	return 0;
 }
 
-static u8 gbcodec_reg[GBCODEC_REG_COUNT] = {
-	[GBCODEC_CTL_REG] = GBCODEC_CTL_REG_DEFAULT,
-	[GBCODEC_MUTE_REG] = GBCODEC_MUTE_REG_DEFAULT,
-	[GBCODEC_PB_LVOL_REG] = GBCODEC_PB_VOL_REG_DEFAULT,
-	[GBCODEC_PB_RVOL_REG] = GBCODEC_PB_VOL_REG_DEFAULT,
-	[GBCODEC_CAP_LVOL_REG] = GBCODEC_CAP_VOL_REG_DEFAULT,
-	[GBCODEC_CAP_RVOL_REG] = GBCODEC_CAP_VOL_REG_DEFAULT,
-	[GBCODEC_APB1_MUX_REG] = GBCODEC_APB1_MUX_REG_DEFAULT,
-	[GBCODEC_APB2_MUX_REG] = GBCODEC_APB2_MUX_REG_DEFAULT,
-};
-
 static int gbcodec_write(struct snd_soc_codec *codec, unsigned int reg,
 			 unsigned int value)
 {
-	int ret = 0;
-
-	if (reg == SND_SOC_NOPM)
-		return 0;
-
-	BUG_ON(reg >= GBCODEC_REG_COUNT);
-
-	gbcodec_reg[reg] = value;
-	dev_dbg(codec->dev, "reg[%d] = 0x%x\n", reg, value);
-
-	return ret;
+	return 0;
 }
 
 static unsigned int gbcodec_read(struct snd_soc_codec *codec,
 				 unsigned int reg)
 {
-	unsigned int val = 0;
-
-	if (reg == SND_SOC_NOPM)
-		return 0;
-
-	BUG_ON(reg >= GBCODEC_REG_COUNT);
-
-	val = gbcodec_reg[reg];
-	dev_dbg(codec->dev, "reg[%d] = 0x%x\n", reg, val);
-
-	return val;
+	return 0;
 }
 
 static struct snd_soc_codec_driver soc_codec_dev_gbaudio = {
@@ -1076,10 +1045,6 @@ static struct snd_soc_codec_driver soc_codec_dev_gbaudio = {
 	.read = gbcodec_read,
 	.write = gbcodec_write,
 
-	.reg_cache_size = GBCODEC_REG_COUNT,
-	.reg_cache_default = gbcodec_reg_defaults,
-	.reg_word_size = 1,
-
 	.idle_bias_off = true,
 	.ignore_pmdown_time = 1,
 };

drivers/staging/greybus/audio_codec.h

@@ -24,18 +24,6 @@ enum {
 	NUM_CODEC_DAIS,
 };
 
-enum gbcodec_reg_index {
-	GBCODEC_CTL_REG,
-	GBCODEC_MUTE_REG,
-	GBCODEC_PB_LVOL_REG,
-	GBCODEC_PB_RVOL_REG,
-	GBCODEC_CAP_LVOL_REG,
-	GBCODEC_CAP_RVOL_REG,
-	GBCODEC_APB1_MUX_REG,
-	GBCODEC_APB2_MUX_REG,
-	GBCODEC_REG_COUNT
-};
-
 /* device_type should be same as defined in audio.h (Android media layer) */
 enum {
 	GBAUDIO_DEVICE_NONE                     = 0x0,
@@ -51,42 +39,9 @@ enum {
 	GBAUDIO_DEVICE_IN_WIRED_HEADSET         = GBAUDIO_DEVICE_BIT_IN | 0x10,
 };
 
-/* bit 0-SPK, 1-HP, 2-DAC,
- * 4-MIC, 5-HSMIC, 6-MIC2
- */
-#define GBCODEC_CTL_REG_DEFAULT		0x00
-
-/* bit 0,1 - APB1-PB-L/R
- * bit 2,3 - APB2-PB-L/R
- * bit 4,5 - APB1-Cap-L/R
- * bit 6,7 - APB2-Cap-L/R
- */
-#define	GBCODEC_MUTE_REG_DEFAULT	0x00
-
-/* 0-127 steps */
-#define	GBCODEC_PB_VOL_REG_DEFAULT	0x00
-#define	GBCODEC_CAP_VOL_REG_DEFAULT	0x00
-
-/* bit 0,1,2 - PB stereo, left, right
- * bit 8,9,10 - Cap stereo, left, right
- */
-#define GBCODEC_APB1_MUX_REG_DEFAULT	0x00
-#define GBCODEC_APB2_MUX_REG_DEFAULT	0x00
-
 #define GBCODEC_JACK_MASK		0x0000FFFF
 #define GBCODEC_JACK_BUTTON_MASK	0xFFFF0000
 
-static const u8 gbcodec_reg_defaults[GBCODEC_REG_COUNT] = {
-	GBCODEC_CTL_REG_DEFAULT,
-	GBCODEC_MUTE_REG_DEFAULT,
-	GBCODEC_PB_VOL_REG_DEFAULT,
-	GBCODEC_PB_VOL_REG_DEFAULT,
-	GBCODEC_CAP_VOL_REG_DEFAULT,
-	GBCODEC_CAP_VOL_REG_DEFAULT,
-	GBCODEC_APB1_MUX_REG_DEFAULT,
-	GBCODEC_APB2_MUX_REG_DEFAULT,
-};
-
 enum gbaudio_codec_state {
 	GBAUDIO_CODEC_SHUTDOWN = 0,
 	GBAUDIO_CODEC_STARTUP,
@@ -116,7 +71,6 @@ struct gbaudio_codec_info {
 	/* to maintain runtime stream params for each DAI */
 	struct list_head dai_list;
 	struct mutex lock;
-	u8 reg[GBCODEC_REG_COUNT];
 };
 
 struct gbaudio_widget {