[PATCH alsa-lib 3/3] mixer: Add exception for some capture-vol-ctls which have a " Volume" suffix

[Hans de Goede]

The following ASoC codec drivers:

sound/soc/codecs/rt5659.c
sound/soc/codecs/rt5660.c
sound/soc/codecs/rt5665.c
sound/soc/codecs/rt5668.c
sound/soc/codecs/rt5670.c
sound/soc/codecs/rt5682.c

Use the following troublesome capture-volume-control names:
"IN1 Boost Volume"
"IN2 Boost Volume"
"IN3 Boost Volume"
"STO1 ADC Boost Gain Volume"
"STO2 ADC Boost Gain Volume"
"Mono ADC Boost Gain Volume"

Note how these are suffixed with just " Volume" instead of
"Capture Volume" add some special handling for this to the base_len()
function, which is responsbile for getting the control-type,
so that the type correctly gets set to CTL_CAPTURE_VOLUME instead of
CTL_GLOBAL_VOLUME.

This correctly makes snd_mixer_selem_has_capture_volume() return true for
these (and makes snd_mixer_selem_has_common_volume() return false).

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 src/mixer/simple_none.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/mixer/simple_none.c b/src/mixer/simple_none.c
index 262e3516..a20b4315 100644
--- a/src/mixer/simple_none.c
+++ b/src/mixer/simple_none.c
@@ -917,6 +917,9 @@ const char * const capture_volume_names[] = {
 	"IN1 Boost",
 	"IN2 Boost",
 	"IN3 Boost",
+	"Mono ADC Boost Gain",
+	"STO1 ADC Boost Gain",
+	"STO2 ADC Boost Gain",
 	NULL
 };
 #endif
@@ -944,6 +947,17 @@ static int base_len(const char *name, selem_ctl_type_t *type)
 			*type = CTL_CAPTURE_VOLUME;
 			return nlen;
 		}
+
+		/*
+		 * Sometimes these have a " Volume" suffix instead of a
+		 * " Capture Volume" suffix. Check for this so that we set
+		 * type to CTL_CAPTURE_VOLUME instead of CTL_GLOBAL_VOLUME.
+		 */
+		snprintf(buf, sizeof(buf), "%s Volume", capture_volume_names[i]);
+		if (!strcmp(name, buf)) {
+			*type = CTL_CAPTURE_VOLUME;
+			return nlen - strlen(" Volume");
+		}
 	}
 
 	p = suffixes;
-- 
2.30.1