Commit 85b741c1 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

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

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: default avatarTakashi Iwai <tiwai@suse.de>
parent fd23116d

sound/usb/mixer.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

	}

}

sound/usb/mixer_maps.c

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
struct usbmix_dB_map {

	int min;

	int max;

	bool min_mute;

};



struct usbmix_name_map {