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Fix USB audio specification compliance by filtering which descriptors can

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appear on which interface. This fixes detection of some USB audio adapters.
Also increase the channel limit for FULL speed devices to 4 channels.

Tested by:	gavin
MFC after:	1 week
This commit is contained in:
Hans Petter Selasky 2012-10-24 08:00:01 +00:00
parent 3750641271
commit 1234097efb
1 changed files with 17 additions and 11 deletions
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16
sys/dev/sound/usb/uaudio.c
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@ -1054,15 +1054,22 @@ uaudio_chan_fill_info_sub(struct uaudio_softc *sc, struct usb_device *udev,
sed.v1 = NULL;
}
if (audio_if == 0) {
if ((acdp == NULL) &&
(desc->bDescriptorType == UDESC_CS_INTERFACE) &&
(desc->bDescriptorSubtype == AS_GENERAL) &&
(desc->bDescriptorSubtype == UDESCSUB_AC_HEADER) &&
(desc->bLength >= sizeof(*acdp))) {
acdp = (void *)desc;
audio_rev = UGETW(acdp->bcdADC);
}
/*
* Don't collect any USB audio descriptors if
* this is not an USB audio stream interface.
*/
continue;
}
if ((acdp != NULL) &&
(desc->bDescriptorType == UDESC_CS_INTERFACE) &&
(desc->bDescriptorSubtype == AS_GENERAL) &&
@ -1132,9 +1139,8 @@ uaudio_chan_fill_info_sub(struct uaudio_softc *sc, struct usb_device *udev,
sed.v1 = (void *)desc;
}
}
if (audio_if == 0 || asid.v1 == NULL ||
asf1d.v1 == NULL || ed1 == NULL ||
sed.v1 == NULL) {
if (asid.v1 == NULL || asf1d.v1 == NULL ||
ed1 == NULL || sed.v1 == NULL) {
/* need more descriptors */
continue;
}
@ -1349,7 +1355,7 @@ uaudio_chan_fill_info(struct uaudio_softc *sc, struct usb_device *udev)
* disable surround setups on FULL-speed USB
* by default
*/
channels = 2;
channels = 4;
break;
default:
channels = 16;