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>
diff --git a/sound/soc/codecs/twl6040.c b/sound/soc/codecs/twl6040.c
index 9fbfe0e..9635466 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 @@
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 @@
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 @@
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)