From: Shuming Fan <shumingf@realtek.com> This patch adds the return value when the volume settings were changed. The userspace application might monitor the kcontrols to check which control changed. Signed-off-by: Shuming Fan <shumingf@realtek.com> --- sound/soc/codecs/rt711-sdca.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/sound/soc/codecs/rt711-sdca.c b/sound/soc/codecs/rt711-sdca.c index 3ab9048b4ea3..98b26bd69e19 100644 --- a/sound/soc/codecs/rt711-sdca.c +++ b/sound/soc/codecs/rt711-sdca.c @@ -509,12 +509,16 @@ static int rt711_sdca_set_gain_put(struct snd_kcontrol *kcontrol, (struct soc_mixer_control *)kcontrol->private_value; struct rt711_sdca_priv *rt711 = snd_soc_component_get_drvdata(component); unsigned int read_l, read_r, gain_l_val, gain_r_val; - unsigned int i, adc_vol_flag = 0; + unsigned int i, adc_vol_flag = 0, changed = 0; + unsigned int lvalue, rvalue; if (strstr(ucontrol->id.name, "FU1E Capture Volume") || strstr(ucontrol->id.name, "FU0F Capture Volume")) adc_vol_flag = 1; + regmap_read(rt711->mbq_regmap, mc->reg, &lvalue); + regmap_read(rt711->mbq_regmap, mc->rreg, &rvalue); + /* control value to 2's complement value */ /* L Channel */ gain_l_val = ucontrol->value.integer.value[0]; @@ -560,6 +564,9 @@ static int rt711_sdca_set_gain_put(struct snd_kcontrol *kcontrol, gain_r_val &= 0xffff; } + if (lvalue != gain_l_val || rvalue != gain_r_val) + changed = 1; + for (i = 0; i < 3; i++) { /* retry 3 times at most */ /* Lch*/ regmap_write(rt711->mbq_regmap, mc->reg, gain_l_val); @@ -573,7 +580,7 @@ static int rt711_sdca_set_gain_put(struct snd_kcontrol *kcontrol, break; } - return i == 3 ? -EIO : 0; + return i == 3 ? -EIO : changed; } static int rt711_sdca_set_gain_get(struct snd_kcontrol *kcontrol, -- 2.29.0