[PATCH v4 10/10] ASoC: tlv320adcx140: add channel sum control
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: 2026-01-13 11:01:47
Also in:
linux-rt-devel, linux-sound, lkml
Subsystem:
sound, sound - soc layer / dynamic audio power management (asoc), texas instruments audio (asoc/hda) drivers, the rest · Maintainers:
Jaroslav Kysela, Takashi Iwai, Liam Girdwood, Mark Brown, Shenghao Ding, Kevin Lu, Baojun Xu, Sen Wang, Linus Torvalds
From: Emil Svendsen <redacted> Add control for channel summation. 3 modes are supported: 1. "Disabled": Normal operation 2. "2 Channel": Every two channels are summed and divided by 2 Out 1 <- (CH1 + CH2) / 2 Out 2 <- (CH1 + CH2) / 2 Out 3 <- (CH3 + CH4) / 2 Out 4 <- (CH3 + CH4) / 2 3. "4 Channel": Every four channels are summed and divided by 4 Out 1 <- (CH1 + CH2 + CH3 + CH4) / 4 Out 2 <- (CH1 + CH2 + CH3 + CH4) / 4 Out 3 <- (CH1 + CH2 + CH3 + CH4) / 4 Out 4 <- (CH1 + CH2 + CH3 + CH4) / 4 Signed-off-by: Emil Svendsen <redacted> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> --- sound/soc/codecs/tlv320adcx140.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index e7c607af642f43b2b783597f3cba3a8cbb31de4a..ac6aab8d722409b2c47b4e1df2a23760bebe795b 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c@@ -222,6 +222,13 @@ static const struct snd_kcontrol_new decimation_filter_controls[] = { SOC_DAPM_ENUM("Decimation Filter", decimation_filter_enum), }; +static const char * const channel_summation_text[] = { + "Disabled", "2 Channel", "4 Channel" +}; + +static SOC_ENUM_SINGLE_DECL(channel_summation_enum, ADCX140_DSP_CFG0, 2, + channel_summation_text); + static const char * const pdmclk_text[] = { "2.8224 MHz", "1.4112 MHz", "705.6 kHz", "5.6448 MHz" };
@@ -711,6 +718,8 @@ static const struct snd_kcontrol_new adcx140_snd_controls[] = { ADCX140_PHASE_CALIB_SWITCH("Phase Calibration Switch"), SOC_SINGLE("Biquads Per Channel", ADCX140_DSP_CFG1, 5, 3, 0), + + SOC_ENUM("Channel Summation", channel_summation_enum), }; static int adcx140_reset(struct adcx140_priv *adcx140)
--
2.47.3