linux-kernel - [PATCH 1/4] ASoC: wm5102: Fix event generation for output compensation

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Date:   Tue, 28 Jun 2022 16:34:06 +0100
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     <broonie@...nel.org>
CC:     <lgirdwood@...il.com>, <alsa-devel@...a-project.org>,
        <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] ASoC: wm5102: Fix event generation for output compensation

The output compensation controls always returns zero regardless of if
the control value was updated. This results in missing notifications
to user-space of the control change. Update the handling to return 1
when the value is changed.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---
 sound/soc/codecs/wm5102.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/sound/soc/codecs/wm5102.c b/sound/soc/codecs/wm5102.c
index da2f8998df87a..b034df47a5ef1 100644
--- a/sound/soc/codecs/wm5102.c
+++ b/sound/soc/codecs/wm5102.c
@@ -680,12 +680,17 @@ static int wm5102_out_comp_coeff_put(struct snd_kcontrol *kcontrol,
 {
 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 	struct arizona *arizona = dev_get_drvdata(component->dev->parent);
+	uint16_t dac_comp_coeff = get_unaligned_be16(ucontrol->value.bytes.data);
+	int ret = 0;
 
 	mutex_lock(&arizona->dac_comp_lock);
-	arizona->dac_comp_coeff = get_unaligned_be16(ucontrol->value.bytes.data);
+	if (arizona->dac_comp_coeff != dac_comp_coeff) {
+		arizona->dac_comp_coeff = dac_comp_coeff;
+		ret = 1;
+	}
 	mutex_unlock(&arizona->dac_comp_lock);
 
-	return 0;
+	return ret;
 }
 
 static int wm5102_out_comp_switch_get(struct snd_kcontrol *kcontrol,
@@ -706,12 +711,20 @@ static int wm5102_out_comp_switch_put(struct snd_kcontrol *kcontrol,
 {
 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 	struct arizona *arizona = dev_get_drvdata(component->dev->parent);
+	struct soc_mixer_control *mc = (struct soc_mixer_control *)kcontrol->private_value;
+	int ret = 0;
+
+	if (ucontrol->value.integer.value[0] > mc->max)
+		return -EINVAL;
 
 	mutex_lock(&arizona->dac_comp_lock);
-	arizona->dac_comp_enabled = ucontrol->value.integer.value[0];
+	if (arizona->dac_comp_enabled != ucontrol->value.integer.value[0]) {
+		arizona->dac_comp_enabled = ucontrol->value.integer.value[0];
+		ret = 1;
+	}
 	mutex_unlock(&arizona->dac_comp_lock);
 
-	return 0;
+	return ret;
 }
 
 static const char * const wm5102_osr_text[] = {
-- 
2.30.2