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ALSA: usb-audio: add control index offset

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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>
This commit is contained in:
Eldad Zack
2012-11-28 23:55:35 +01:00
committed by Takashi Iwai
parent 28acb12014
commit 9f81410592
3 changed files with 20 additions and 1 deletions
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4
sound/usb/mixer.c
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@@ -382,6 +382,8 @@ error:
static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
{
validx += cval->idx_off;
return (cval->mixer->protocol == UAC_VERSION_1) ?
get_ctl_value_v1(cval, request, validx, value_ret) :
get_ctl_value_v2(cval, request, validx, value_ret);
@@ -432,6 +434,8 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
unsigned char buf[2];
int idx = 0, val_len, err, timeout = 10;
validx += cval->idx_off;
if (cval->mixer->protocol == UAC_VERSION_1) {
val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
} else { /* UAC_VERSION_2 */