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ALSA: usb-audio: Add minimal-mute notion in dB mapping table

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Some devices do mute the volume at the minimal volume, and for such
devices, we need to set SNDRV_CTL_TLVT_DB_MINMAX_MUTE to the TLV
information.  It corresponds to setting usb_mixer_elem_info.min_mute
flag in the USB-audio driver.

This patch adds a new field min_mute in usbmix_dB_map so that the
mixer map entry can pass the flag.

Link: https://lore.kernel.org/r/20211116065415.11159-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-11-16 07:54:14 +01:00
parent fd23116d7b
commit 85b741c1cb
2 changed files with 2 additions and 0 deletions
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1
sound/usb/mixer.c
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@ -145,6 +145,7 @@ static inline void check_mapped_dB(const struct usbmix_name_map *p,
if (p && p->dB) {
cval->dBmin = p->dB->min;
cval->dBmax = p->dB->max;
cval->min_mute = p->dB->min_mute;
cval->initialized = 1;
}
}

1
sound/usb/mixer_maps.c
View file

@ -8,6 +8,7 @@
struct usbmix_dB_map {
int min;
int max;
bool min_mute;
};
struct usbmix_name_map {