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ASoC: twl6040: Introduce SW only shadow register

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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>
This commit is contained in:
Peter Ujfalusi 2011-09-22 11:05:48 +03:00 committed by Mark Brown
parent 5bf692d972
commit d17bf31832
2 changed files with 16 additions and 5 deletions
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2
include/linux/mfd/twl6040.h
View File

@ -68,8 +68,6 @@
#define TWL6040_REG_ACCCTL 0x2D
#define TWL6040_REG_STATUS 0x2E
#define TWL6040_CACHEREGNUM (TWL6040_REG_STATUS + 1)
/* INTID (0x03) fields */
#define TWL6040_THINT 0x01

19
sound/soc/codecs/twl6040.c
View File

@ -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)