ASoC: qcom: sc8280xp: Limit speaker digital volumes

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@linaro.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20231204124736.132185-3-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/qcom/sc8280xp.c b/sound/soc/qcom/sc8280xp.c
index d93b18f07be59a9218281c3f370983e6104d7970..39cb0b889aff91326fccf4e0aea681707f89b17a 100644 (file)
--- a/sound/soc/qcom/sc8280xp.c
+++ b/sound/soc/qcom/sc8280xp.c
@@ -27,6 +27,23 @@ 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);
 }