diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2011-09-22 11:05:48 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-09-22 17:20:21 +0100 |
| commit | d17bf31832d30b91225a84b53fae380dbdd07d3d (patch) | |
| tree | 4f048ca6c78aab7efec4210c34cedf01ae8c0355 /sound/soc/codecs/twl6040.c | |
| parent | 5bf692d97225a1e714cfd40a9a67401ebd630a7b (diff) | |
ASoC: twl6040: Introduce SW only shadow register
Software only shadow register to be used by the driver.
For example Earpiece path will need this shadow register.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/codecs/twl6040.c')
| -rw-r--r-- | sound/soc/codecs/twl6040.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/sound/soc/codecs/twl6040.c b/sound/soc/codecs/twl6040.c index 9fbfe0ee90f..96354660c34 100644 --- a/sound/soc/codecs/twl6040.c +++ b/sound/soc/codecs/twl6040.c @@ -57,6 +57,10 @@ #define TWL6040_HF_VOL_MASK 0x1F #define TWL6040_HF_VOL_SHIFT 0 +/* Shadow register used by the driver */ +#define TWL6040_REG_SW_SHADOW 0x2F +#define TWL6040_CACHEREGNUM (TWL6040_REG_SW_SHADOW + 1) + struct twl6040_output { u16 active; u16 left_vol; @@ -153,6 +157,8 @@ static const u8 twl6040_reg[TWL6040_CACHEREGNUM] = { 0x00, /* REG_HFOTRIM 0x2C */ 0x09, /* REG_ACCCTL 0x2D */ 0x00, /* REG_STATUS 0x2E (ro) */ + + 0x00, /* REG_SW_SHADOW 0x2F - Shadow, non HW register */ }; /* List of registers to be restored after power up */ @@ -236,8 +242,12 @@ static int twl6040_read_reg_volatile(struct snd_soc_codec *codec, if (reg >= TWL6040_CACHEREGNUM) return -EIO; - value = twl6040_reg_read(twl6040, reg); - twl6040_write_reg_cache(codec, reg, value); + if (likely(reg < TWL6040_REG_SW_SHADOW)) { + value = twl6040_reg_read(twl6040, reg); + twl6040_write_reg_cache(codec, reg, value); + } else { + value = twl6040_read_reg_cache(codec, reg); + } return value; } @@ -254,7 +264,10 @@ static int twl6040_write(struct snd_soc_codec *codec, return -EIO; twl6040_write_reg_cache(codec, reg, value); - return twl6040_reg_write(twl6040, reg, value); + if (likely(reg < TWL6040_REG_SW_SHADOW)) + return twl6040_reg_write(twl6040, reg, value); + else + return 0; } static void twl6040_init_chip(struct snd_soc_codec *codec) |