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| author | Eldad Zack <eldad@fogrefinery.com> | 2012-11-28 23:55:35 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-11-29 08:43:12 +0100 |
| commit | 9f814105926cbeb003b1684cd5564612bccfe45c (patch) | |
| tree | 3a80076a31997d21dcfa20a21a58747bf6675173 /sound/usb/mixer.c | |
| parent | 28acb12014fb0c3e1edfdab1b1e3e266cf651550 (diff) | |
| download | linux-9f814105926cbeb003b1684cd5564612bccfe45c.tar.gz linux-9f814105926cbeb003b1684cd5564612bccfe45c.tar.bz2 linux-9f814105926cbeb003b1684cd5564612bccfe45c.zip | |
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.c')
| -rw-r--r-- | sound/usb/mixer.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 298070e8f2d4..b0fc6ae037a2 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -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 */ |