The AllWinner H6 and later SoCs that sport a DMIC block contain a set of registers to control
the gain (left + right) of each of the four supported channels.
Add ASoC controls for changing each of the stereo channel gains using alsamixer and alike
---
sound/soc/sunxi/sun50i-dmic.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/sound/soc/sunxi/sun50i-dmic.c b/sound/soc/sunxi/sun50i-dmic.c
index c76628bc86c6..f8613d8c3462 100644
--- a/sound/soc/sunxi/sun50i-dmic.c
+++ b/sound/soc/sunxi/sun50i-dmic.c
@@ -14,6 +14,7 @@
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
+#include <sound/tlv.h>
#define SUN50I_DMIC_EN_CTL (0x00)
#define SUN50I_DMIC_EN_CTL_GLOBE BIT(8)
@@ -43,6 +44,17 @@
#define SUN50I_DMIC_CH_NUM_N_MASK GENMASK(2, 0)
#define SUN50I_DMIC_CNT (0x2c)
#define SUN50I_DMIC_CNT_N (1 << 0)
+#define SUN50I_DMIC_D0D1_VOL_CTR (0x30)
+ #define SUN50I_DMIC_D0D1_VOL_CTR_0R (0)
+ #define SUN50I_DMIC_D0D1_VOL_CTR_0L (8)
+ #define SUN50I_DMIC_D0D1_VOL_CTR_1R (16)
+ #define SUN50I_DMIC_D0D1_VOL_CTR_1L (24)
+#define SUN50I_DMIC_D2D3_VOL_CTR (0x34)
+ #define SUN50I_DMIC_D2D3_VOL_CTR_2R (0)
+ #define SUN50I_DMIC_D2D3_VOL_CTR_2L (8)
+ #define SUN50I_DMIC_D2D3_VOL_CTR_3R (16)
+ #define SUN50I_DMIC_D2D3_VOL_CTR_3L (24)
+
#define SUN50I_DMIC_HPF_CTRL (0x38)
#define SUN50I_DMIC_VERSION (0x50)
@@ -273,8 +285,30 @@ static const struct of_device_id sun50i_dmic_of_match[] = {
};
MODULE_DEVICE_TABLE(of, sun50i_dmic_of_match);
+static const DECLARE_TLV_DB_SCALE(sun50i_dmic_vol_scale, -12000, 75, 1);
+
+static const struct snd_kcontrol_new sun50i_dmic_controls[] = {
+
+ SOC_DOUBLE_TLV("DMIC Channel 0 Capture Volume", SUN50I_DMIC_D0D1_VOL_CTR,
+ SUN50I_DMIC_D0D1_VOL_CTR_0L, SUN50I_DMIC_D0D1_VOL_CTR_0R,
+ 0xFF, 0, sun50i_dmic_vol_scale),
+ SOC_DOUBLE_TLV("DMIC Channel 1 Capture Volume", SUN50I_DMIC_D0D1_VOL_CTR,
+ SUN50I_DMIC_D0D1_VOL_CTR_1L, SUN50I_DMIC_D0D1_VOL_CTR_1R,
+ 0xFF, 0, sun50i_dmic_vol_scale),
+ SOC_DOUBLE_TLV("DMIC Channel 2 Capture Volume", SUN50I_DMIC_D2D3_VOL_CTR,
+ SUN50I_DMIC_D2D3_VOL_CTR_2L, SUN50I_DMIC_D2D3_VOL_CTR_2R,
+ 0xFF, 0, sun50i_dmic_vol_scale),
+ SOC_DOUBLE_TLV("DMIC Channel 3 Capture Volume", SUN50I_DMIC_D2D3_VOL_CTR,
+ SUN50I_DMIC_D2D3_VOL_CTR_3L, SUN50I_DMIC_D2D3_VOL_CTR_3R,
+ 0xFF, 0, sun50i_dmic_vol_scale),
+
+
+};
+
static const struct snd_soc_component_driver sun50i_dmic_component = {
.name = "sun50i-dmic",
+ .controls = sun50i_dmic_controls,
+ .num_controls = ARRAY_SIZE(sun50i_dmic_controls),
};
static int sun50i_dmic_runtime_suspend(struct device *dev)
--
2.25.1
