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authorJussi Laako <jussi@sonarnerd.net>2019-02-18 01:17:21 +0300
committerTakashi Iwai <tiwai@suse.de>2019-02-18 11:36:09 +0300
commitc7a13264918b9796f80c634f20fea56e1612572d (patch)
treed0d8757c02033712f513904f827962e0b0c3fded /sound/usb/card.h
parenta06702ca023feccb7c1a5171987f5cac959427ed (diff)
downloadlinux-c7a13264918b9796f80c634f20fea56e1612572d.tar.xz
ALSA: usb-audio: Expose sample resolution through proc interface
At least some USB devices use (MSB-aligned) audio format larger than the actual resolution of the device. In order to expose the actual device resolution (bBitResolution), add extra field to the procfs stream info interface. Signed-off-by: Jussi Laako <jussi@sonarnerd.net> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/card.h')
-rw-r--r--sound/usb/card.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h
index ac785d15ced4..79fa2a19fb7b 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -14,6 +14,7 @@ struct audioformat {
u64 formats; /* ALSA format bits */
unsigned int channels; /* # channels */
unsigned int fmt_type; /* USB audio format type (1-3) */
+ unsigned int fmt_bits; /* number of significant bits */
unsigned int frame_size; /* samples per frame for non-audio */
int iface; /* interface number */
unsigned char altsetting; /* corresponding alternate setting */