ASoC: nau8825: add programmable biquad filter control
Add programmable biquad filter configuration control for user space.
The filter is configurable for low pass filters, high pass filters,
Notch filter, etc in the ADC and DAC path.
Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/nau8825.h b/sound/soc/codecs/nau8825.h
index 9e6cb62..1293d1b 100644
--- a/sound/soc/codecs/nau8825.h
+++ b/sound/soc/codecs/nau8825.h
@@ -231,6 +231,14 @@
#define NAU8825_I2S_MS_MASTER (1 << NAU8825_I2S_MS_SFT)
#define NAU8825_I2S_MS_SLAVE (0 << NAU8825_I2S_MS_SFT)
+/* BIQ_CTRL (0x20) */
+#define NAU8825_BIQ_WRT_SFT 4
+#define NAU8825_BIQ_WRT_EN (1 << NAU8825_BIQ_WRT_SFT)
+#define NAU8825_BIQ_PATH_SFT 0
+#define NAU8825_BIQ_PATH_MASK (1 << NAU8825_BIQ_PATH_SFT)
+#define NAU8825_BIQ_PATH_ADC (0 << NAU8825_BIQ_PATH_SFT)
+#define NAU8825_BIQ_PATH_DAC (1 << NAU8825_BIQ_PATH_SFT)
+
/* ADC_RATE (0x2b) */
#define NAU8825_ADC_SYNC_DOWN_SFT 0
#define NAU8825_ADC_SYNC_DOWN_MASK 0x3