From: Martin Povišer <povik+lin@cutebit.org>
Date: Sat, 8 Feb 2025 00:57:22 +0000 (+0000)
Subject: ASoC: ops: Enforce platform maximum on initial value
X-Git-Tag: v6.15-rc1~173^2~4^2~115
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=783db6851c1821d8b983ffb12b99c279ff64f2ee;p=thirdparty%2Fkernel%2Flinux.git

ASoC: ops: Enforce platform maximum on initial value

Lower the volume if it is violating the platform maximum at its initial
value (i.e. at the time of the 'snd_soc_limit_volume' call).

Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
[Cherry picked from the Asahi kernel with fixups -- broonie]
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20250208-asoc-volume-limit-v1-1-b98fcf4cdbad@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index c6601ef16f843..a7d0d4035d65e 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -639,6 +639,33 @@ int snd_soc_get_volsw_range(struct snd_kcontrol *kcontrol,
 }
 EXPORT_SYMBOL_GPL(snd_soc_get_volsw_range);
 
+static int snd_soc_clip_to_platform_max(struct snd_kcontrol *kctl)
+{
+	struct soc_mixer_control *mc = (struct soc_mixer_control *)kctl->private_value;
+	struct snd_ctl_elem_value uctl;
+	int ret;
+
+	if (!mc->platform_max)
+		return 0;
+
+	ret = kctl->get(kctl, &uctl);
+	if (ret < 0)
+		return ret;
+
+	if (uctl.value.integer.value[0] > mc->platform_max)
+		uctl.value.integer.value[0] = mc->platform_max;
+
+	if (snd_soc_volsw_is_stereo(mc) &&
+	    uctl.value.integer.value[1] > mc->platform_max)
+		uctl.value.integer.value[1] = mc->platform_max;
+
+	ret = kctl->put(kctl, &uctl);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 /**
  * snd_soc_limit_volume - Set new limit to an existing volume control.
  *
@@ -663,7 +690,7 @@ int snd_soc_limit_volume(struct snd_soc_card *card,
 		struct soc_mixer_control *mc = (struct soc_mixer_control *)kctl->private_value;
 		if (max <= mc->max - mc->min) {
 			mc->platform_max = max;
-			ret = 0;
+			ret = snd_soc_clip_to_platform_max(kctl);
 		}
 	}
 	return ret;