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ALSA: usb - Don't create "Speaker" mixer controls on headphones and headsets 

A lot of headsets/headphones have a "Speaker" mixer control. This confuses
PulseAudio to think it is a speaker instead of a headphone/headset.
Therfore, we rename it to "Headphone".

We determine if something is a headphone similar to how udev determines
form factor (see 78-sound-card.rules).

BugLink: https://bugs.launchpad.net/bugs/1082357
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Henningsson 2012-11-23 13:48:55 +01:00 committed by Takashi Iwai
parent ca10a7ebdf
commit 9b4ef97757
1 changed files with 30 additions and 0 deletions
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30
sound/usb/mixer.c
View File

@ -1136,6 +1136,32 @@ static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
}
/* A lot of headsets/headphones have a "Speaker" mixer. Make sure we
rename it to "Headphone". We determine if something is a headphone
similar to how udev determines form factor. */
static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
struct snd_card *card)
{
const char *names_to_check[] = {
"Headset", "headset", "Headphone", "headphone", NULL};
const char **s;
bool found = 0;
if (strcmp("Speaker", kctl->id.name))
return;
for (s = names_to_check; *s; s++)
if (strstr(card->shortname, *s)) {
found = 1;
break;
}
if (!found)
return;
strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
}
static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
unsigned int ctl_mask, int control,
struct usb_audio_term *iterm, int unitid,
@ -1222,6 +1248,10 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
len = snprintf(kctl->id.name, sizeof(kctl->id.name),
"Feature %d", unitid);
}
if (!mapped_name)
check_no_speaker_on_headset(kctl, state->mixer->chip->card);
/* determine the stream direction:
* if the connected output is USB stream, then it's likely a
* capture stream. otherwise it should be playback (hopefully :)