[PATCH 2/2] ASoC: sta32x: Convert to regmap

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

Long term all drivers should be using regmap directly. This is more
idiomatic and moves us towards the removal of the ASoC level cache
code.

The initialiasation of reserved register bits in probe() is slightly odd
as the defaults being written don't appear to match the silicon defaults
but the new code should have the same effect as the old code.

The watchdog code will now unconditionally do a mute and unmute when
resyncing but since we only sync when we are very sure there is something
to sync this should have no impact.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 sound/soc/codecs/sta32x.c |  106 +++++++++++++++++++++++++++++++++------------
 1 file changed, 79 insertions(+), 27 deletions(-)

diff --git a/sound/soc/codecs/sta32x.c b/sound/soc/codecs/sta32x.c
index 039597e..744ec7a 100644
--- a/sound/soc/codecs/sta32x.c
+++ b/sound/soc/codecs/sta32x.c
@@ -24,6 +24,7 @@
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
+#include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
@@ -55,12 +56,50 @@
 	 SNDRV_PCM_FMTBIT_S32_LE  | SNDRV_PCM_FMTBIT_S32_BE)
 
 /* Power-up register defaults */
-static const u8 sta32x_regs[STA32X_REGISTER_COUNT] = {
-	0x63, 0x80, 0xc2, 0x40, 0xc2, 0x5c, 0x10, 0xff, 0x60, 0x60,
-	0x60, 0x80, 0x00, 0x00, 0x00, 0x40, 0x80, 0x77, 0x6a, 0x69,
-	0x6a, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2d,
-	0xc0, 0xf3, 0x33, 0x00, 0x0c,
+static const struct reg_default sta32x_regs[] = {
+	{  0x0, 0x63 },
+	{  0x1, 0x80 },
+	{  0x2, 0xc2 },
+	{  0x3, 0x40 },
+	{  0x4, 0xc2 },
+	{  0x5, 0x5c },
+	{  0x6, 0x10 },
+	{  0x7, 0xff },
+	{  0x8, 0x60 },
+	{  0x9, 0x60 },
+	{  0xa, 0x60 },
+	{  0xb, 0x80 },
+	{  0xc, 0x00 },
+	{  0xd, 0x00 },
+	{  0xe, 0x00 },
+	{  0xf, 0x40 },
+	{ 0x10, 0x80 },
+	{ 0x11, 0x77 },
+	{ 0x12, 0x6a },
+	{ 0x13, 0x69 },
+	{ 0x14, 0x6a },
+	{ 0x15, 0x69 },
+	{ 0x16, 0x00 },
+	{ 0x17, 0x00 },
+	{ 0x18, 0x00 },
+	{ 0x19, 0x00 },
+	{ 0x1a, 0x00 },
+	{ 0x1b, 0x00 },
+	{ 0x1c, 0x00 },
+	{ 0x1d, 0x00 },
+	{ 0x1e, 0x00 },
+	{ 0x1f, 0x00 },
+	{ 0x20, 0x00 },
+	{ 0x21, 0x00 },
+	{ 0x22, 0x00 },
+	{ 0x23, 0x00 },
+	{ 0x24, 0x00 },
+	{ 0x25, 0x00 },
+	{ 0x26, 0x00 },
+	{ 0x27, 0x2d },
+	{ 0x28, 0xc0 },
+	{ 0x2b, 0x00 },
+	{ 0x2c, 0x0c },
 };
 
 /* regulator power supply names */
@@ -72,6 +111,7 @@ static const char *sta32x_supply_names[] = {
 
 /* codec private data */
 struct sta32x_priv {
+	struct regmap *regmap;
 	struct regulator_bulk_data supplies[ARRAY_SIZE(sta32x_supply_names)];
 	struct snd_soc_codec *codec;
 	struct sta32x_platform_data *pdata;
@@ -291,17 +331,15 @@ static int sta32x_sync_coef_shadow(struct snd_soc_codec *codec)
 
 static int sta32x_cache_sync(struct snd_soc_codec *codec)
 {
+	struct sta32x_priv *sta32x = codec->control_data;
 	unsigned int mute;
 	int rc;
 
-	if (!codec->cache_sync)
-		return 0;
-
 	/* mute during register sync */
 	mute = snd_soc_read(codec, STA32X_MMUTE);
 	snd_soc_write(codec, STA32X_MMUTE, mute | STA32X_MMUTE_MMUTE);
 	sta32x_sync_coef_shadow(codec);
-	rc = snd_soc_cache_sync(codec);
+	rc = regcache_sync(sta32x->regmap);
 	snd_soc_write(codec, STA32X_MMUTE, mute);
 	return rc;
 }
@@ -316,11 +354,11 @@ static void sta32x_watchdog(struct work_struct *work)
 
 	/* check if sta32x has reset itself */
 	confa_cached = snd_soc_read(codec, STA32X_CONFA);
-	codec->cache_bypass = 1;
+	regcache_cache_bypass(sta32x->regmap, true);
 	confa = snd_soc_read(codec, STA32X_CONFA);
-	codec->cache_bypass = 0;
+	regcache_cache_bypass(sta32x->regmap, false);
 	if (confa != confa_cached) {
-		codec->cache_sync = 1;
+		regcache_mark_dirty(sta32x->regmap);
 		sta32x_cache_sync(codec);
 	}
 
@@ -835,7 +873,8 @@ static int sta32x_probe(struct snd_soc_codec *codec)
 	/* Tell ASoC what kind of I/O to use to read the registers.  ASoC will
 	 * then do the I2C transactions itself.
 	 */
-	ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_I2C);
+	codec->control_data = sta32x->regmap;
+	ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
 	if (ret < 0) {
 		dev_err(codec->dev, "failed to set cache I/O (ret=%i)\n", ret);
 		goto err;
@@ -847,13 +886,15 @@ static int sta32x_probe(struct snd_soc_codec *codec)
 	 * so the write to the these registers are suppressed by the cache
 	 * restore code when it skips writes of default registers.
 	 */
-	snd_soc_cache_write(codec, STA32X_CONFC, 0xc2);
-	snd_soc_cache_write(codec, STA32X_CONFE, 0xc2);
-	snd_soc_cache_write(codec, STA32X_CONFF, 0x5c);
-	snd_soc_cache_write(codec, STA32X_MMUTE, 0x10);
-	snd_soc_cache_write(codec, STA32X_AUTO1, 0x60);
-	snd_soc_cache_write(codec, STA32X_AUTO3, 0x00);
-	snd_soc_cache_write(codec, STA32X_C3CFG, 0x40);
+	regcache_cache_only(sta32x->regmap, true);
+	snd_soc_write(codec, STA32X_CONFC, 0xc2);
+	snd_soc_write(codec, STA32X_CONFE, 0xc2);
+	snd_soc_write(codec, STA32X_CONFF, 0x5c);
+	snd_soc_write(codec, STA32X_MMUTE, 0x10);
+	snd_soc_write(codec, STA32X_AUTO1, 0x60);
+	snd_soc_write(codec, STA32X_AUTO3, 0x00);
+	snd_soc_write(codec, STA32X_C3CFG, 0x40);
+	regcache_cache_only(sta32x->regmap, false);
 
 	/* set thermal warning adjustment and recovery */
 	if (!(sta32x->pdata->thermal_conf & STA32X_THERMAL_ADJUSTMENT_ENABLE))
@@ -920,8 +961,7 @@ static int sta32x_remove(struct snd_soc_codec *codec)
 	return 0;
 }
 
-static int sta32x_reg_is_volatile(struct snd_soc_codec *codec,
-				  unsigned int reg)
+static bool sta32x_reg_is_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case STA32X_CONFA ... STA32X_L2ATRT:
@@ -936,10 +976,6 @@ static const struct snd_soc_codec_driver sta32x_codec = {
 	.remove =		sta32x_remove,
 	.suspend =		sta32x_suspend,
 	.resume =		sta32x_resume,
-	.reg_cache_size =	STA32X_REGISTER_COUNT,
-	.reg_word_size =	sizeof(u8),
-	.reg_cache_default =	sta32x_regs,
-	.volatile_register =	sta32x_reg_is_volatile,
 	.set_bias_level =	sta32x_set_bias_level,
 	.controls =		sta32x_snd_controls,
 	.num_controls =		ARRAY_SIZE(sta32x_snd_controls),
@@ -949,6 +985,15 @@ static const struct snd_soc_codec_driver sta32x_codec = {
 	.num_dapm_routes =	ARRAY_SIZE(sta32x_dapm_routes),
 };
 
+static const struct regmap_config sta32x_regmap = {
+	.reg_bits =		8,
+	.val_bits =		8,
+	.max_register =		STA32X_FDRC2,
+	.reg_defaults =		sta32x_regs,
+	.num_reg_defaults =	ARRAY_SIZE(sta32x_regs),
+	.volatile_reg =		sta32x_reg_is_volatile,
+};
+
 static __devinit int sta32x_i2c_probe(struct i2c_client *i2c,
 				      const struct i2c_device_id *id)
 {
@@ -971,6 +1016,13 @@ static __devinit int sta32x_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	sta32x->regmap = devm_regmap_init_i2c(i2c, &sta32x_regmap);
+	if (IS_ERR(sta32x->regmap)) {
+		ret = PTR_ERR(sta32x->regmap);
+		dev_err(&i2c->dev, "Failed to init regmap: %d\n", ret);
+		return ret;
+	}
+
 	i2c_set_clientdata(i2c, sta32x);
 
 	ret = snd_soc_register_codec(&i2c->dev, &sta32x_codec, &sta32x_dai, 1);
-- 
1.7.10.4