diff options
| author | Eldad Zack <eldad@fogrefinery.com> | 2012-11-29 02:55:35 +0400 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-11-29 11:43:12 +0400 |
| commit | 9f814105926cbeb003b1684cd5564612bccfe45c (patch) | |
| tree | 3a80076a31997d21dcfa20a21a58747bf6675173 /sound/usb/mixer_quirks.c | |
| parent | 28acb12014fb0c3e1edfdab1b1e3e266cf651550 (diff) | |
| download | linux-9f814105926cbeb003b1684cd5564612bccfe45c.tar.xz | |
ALSA: usb-audio: add control index offset
Currently, channel IDs exceeding 31 (0x1f) cannot be used.
The channel ID is derived from the cmask. Extending cmask
to a 64-bit type would only allow it to go up to 63 (0x3f).
Some devices have channel IDs exceeding that as well.
To address that, add an offset to the mixer element which
is then accounted for in the UAC set/get functions.
Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/mixer_quirks.c')
| -rw-r--r-- | sound/usb/mixer_quirks.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c index ae2b71435220..4199b97e76a1 100644 --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -63,11 +63,12 @@ static void usb_mixer_elem_free(struct snd_kcontrol *kctl) * Since there doesn't seem to be a devices that needs a multichannel * version, we keep it mono for simplicity. */ -static int snd_create_std_mono_ctl(struct usb_mixer_interface *mixer, +static int snd_create_std_mono_ctl_offset(struct usb_mixer_interface *mixer, unsigned int unitid, unsigned int control, unsigned int cmask, int val_type, + unsigned int idx_off, const char *name, snd_kcontrol_tlv_rw_t *tlv_callback) { @@ -85,6 +86,7 @@ static int snd_create_std_mono_ctl(struct usb_mixer_interface *mixer, cval->channels = 1; cval->control = control; cval->cmask = cmask; + cval->idx_off = idx_off; /* get_min_max() is called only for integer volumes later, * so provide a short-cut for booleans */ @@ -120,6 +122,18 @@ static int snd_create_std_mono_ctl(struct usb_mixer_interface *mixer, return 0; } +static int snd_create_std_mono_ctl(struct usb_mixer_interface *mixer, + unsigned int unitid, + unsigned int control, + unsigned int cmask, + int val_type, + const char *name, + snd_kcontrol_tlv_rw_t *tlv_callback) +{ + return snd_create_std_mono_ctl_offset(mixer, unitid, control, cmask, + val_type, 0 /* Offset */, name, tlv_callback); +} + /* * Create a set of standard UAC controls from a table */ |