linux-kernel - [PATCH 2/2] ASoC: qcom: sc8280xp: Limit speaker digital volumes

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Message-Id: <20231204124736.132185-3-srinivas.kandagatla@linaro.org>
Date:   Mon,  4 Dec 2023 12:47:36 +0000
From:   srinivas.kandagatla@...aro.org
To:     broonie@...nel.org, alsa-devel@...a-project.org
Cc:     perex@...ex.cz, tiwai@...e.com, linux-sound@...r.kernel.org,
        linux-kernel@...r.kernel.org, johan+linaro@...nel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 2/2] ASoC: qcom: sc8280xp: Limit speaker digital volumes

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

Limit the speaker digital gains to 0dB so that the users will not damage them.
Currently there is a limit in UCM, but this does not stop the user form
changing the digital gains from command line. So limit this in driver
which makes the speakers more safer without active speaker protection in
place.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 sound/soc/qcom/sc8280xp.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/sound/soc/qcom/sc8280xp.c b/sound/soc/qcom/sc8280xp.c
index 249a43e1dee3..1e8f9452cd28 100644
--- a/sound/soc/qcom/sc8280xp.c
+++ b/sound/soc/qcom/sc8280xp.c
@@ -25,6 +25,23 @@ struct sc8280xp_snd_data {
 static int sc8280xp_snd_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct sc8280xp_snd_data *data = snd_soc_card_get_drvdata(rtd->card);
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_card *card = rtd->card;
+
+	switch (cpu_dai->id) {
+	case WSA_CODEC_DMA_RX_0:
+	case WSA_CODEC_DMA_RX_1:
+		/*
+		 * set limit of 0dB on Digital Volume for Speakers,
+		 * this can prevent damage of speakers to some extent without
+		 * active speaker protection
+		 */
+		snd_soc_limit_volume(card, "WSA_RX0 Digital Volume", 84);
+		snd_soc_limit_volume(card, "WSA_RX1 Digital Volume", 84);
+		break;
+	default:
+		break;
+	}
 
 	return qcom_snd_wcd_jack_setup(rtd, &data->jack, &data->jack_setup);
 }
-- 
2.25.1