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ALSA: usb-audio: fix UAC2 control value queries 

For RANGE requests, we should only query as much bytes as we're in fact
interested in.

For CUR requests, we shouldn't confuse the firmware with an overlong
request but just ask for 2 bytes.

This might need fixing in the future as it's not entirely clear when to
dispatch 1-byte, 2-byte and 4-byte request blocks. For now, we assume
everything is coded in 16bit - this works for all firmware
implementations I've seen.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Reported-by: Alex Lee <alexlee188@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack 2010-06-11 17:34:22 +02:00 committed by Takashi Iwai
parent 67c103664a
commit e8bdb6bbab
1 changed files with 14 additions and 5 deletions
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19
sound/usb/mixer.c
View File

@ -297,20 +297,27 @@ static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int v
static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
{
unsigned char buf[14]; /* enough space for one range of 4 bytes */
unsigned char buf[2 + 3*sizeof(__u16)]; /* enough space for one range */
unsigned char *val;
int ret;
int ret, size;
__u8 bRequest;
bRequest = (request == UAC_GET_CUR) ?
UAC2_CS_CUR : UAC2_CS_RANGE;
if (request == UAC_GET_CUR) {
bRequest = UAC2_CS_CUR;
size = sizeof(__u16);
} else {
bRequest = UAC2_CS_RANGE;
size = sizeof(buf);
}
memset(buf, 0, sizeof(buf));
ret = snd_usb_ctl_msg(cval->mixer->chip->dev,
usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
bRequest,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
validx, cval->mixer->ctrlif | (cval->id << 8),
buf, sizeof(buf), 1000);
buf, size, 1000);
if (ret < 0) {
snd_printk(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
@ -318,6 +325,8 @@ static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int v
return ret;
}
/* FIXME: how should we handle multiple triplets here? */
switch (request) {
case UAC_GET_CUR:
val = buf;