diff options
| -rw-r--r-- | sound/usb/mixer.c | 49 |
1 files changed, 35 insertions, 14 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 409fc1164694..81256ab56835 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1652,6 +1652,34 @@ static const struct usb_feature_control_info *get_feature_control_info(int contr return NULL; } +static int feature_unit_mutevol_ctl_name(struct usb_mixer_interface *mixer, + struct snd_kcontrol *kctl, + struct usb_audio_term *iterm, + struct usb_audio_term *oterm) +{ + struct usb_audio_term *aterm, *bterm; + bool output_first; + int len = 0; + + /* + * If the input terminal is USB Streaming, we try getting the name of + * the output terminal first in hopes of getting something more + * descriptive than "PCM". + */ + output_first = iterm && !(iterm->type >> 16) && (iterm->type & 0xff00) == 0x0100; + + aterm = output_first ? oterm : iterm; + bterm = output_first ? iterm : oterm; + + if (aterm) + len = get_term_name(mixer->chip, aterm, kctl->id.name, + sizeof(kctl->id.name), 1); + if (!len && bterm) + len = get_term_name(mixer->chip, bterm, kctl->id.name, + sizeof(kctl->id.name), 1); + return len; +} + static void __build_feature_ctl(struct usb_mixer_interface *mixer, const struct usbmix_name_map *imap, unsigned int ctl_mask, int control, @@ -1733,22 +1761,15 @@ static void __build_feature_ctl(struct usb_mixer_interface *mixer, case UAC_FU_MUTE: case UAC_FU_VOLUME: /* - * determine the control name. the rule is: - * - if a name id is given in descriptor, use it. - * - if the connected input can be determined, then use the name - * of terminal type. - * - if the connected output can be determined, use it. - * - otherwise, anonymous name. + * Determine the control name: + * - If a name id is given in descriptor, use it. + * - If input and output terminals are present, try to derive + * the name from either of these. + * - Otherwise, make up a name using the feature unit ID. */ if (!len) { - if (iterm) - len = get_term_name(mixer->chip, iterm, - kctl->id.name, - sizeof(kctl->id.name), 1); - if (!len && oterm) - len = get_term_name(mixer->chip, oterm, - kctl->id.name, - sizeof(kctl->id.name), 1); + len = feature_unit_mutevol_ctl_name(mixer, kctl, iterm, + oterm); if (!len) snprintf(kctl->id.name, sizeof(kctl->id.name), "Feature %d", unitid); |