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authorDaniel Mack <zonque@gmail.com>2013-04-24 19:38:42 +0200
committerTakashi Iwai <tiwai@suse.de>2013-04-25 07:33:20 +0200
commitebfc594c02148b6a85c2f178cf167a44a3c3ce10 (patch)
treef4677ef75daa1130ecfd3db9b0c5b49d36fb5198 /sound/usb/stream.c
parent13627549f39a570db01d7152cd9bf57b564d53c5 (diff)
ALSA: snd-usb: try harder to find USB_DT_CS_ENDPOINT
The USB_DT_CS_ENDPOINT class-specific endpoint descriptor is usually stuffed directly after the standard USB endpoint descriptor, and this is where the driver currently expects it to be. There are, however, devices in the wild that have it the other way around in their descriptor sets, so the USB_DT_CS_ENDPOINT comes *before* the standard enpoint. Devices known to implement it that way are "Sennheiser BTD-500" and Plantronics USB headsets. When the driver can't find the USB_DT_CS_ENDPOINT, it won't be able to change sample rates, as the bitmask for the validity of this command is storen in bmAttributes of that descriptor. Fix this by searching the entire interface instead of just the extra bytes of the first endpoint, in case the latter fails. Signed-off-by: Daniel Mack <zonque@gmail.com> Reported-and-tested-by: Torstein Hegge <hegge@resisty.net> Reported-and-tested-by: Yves G <alsa-user@vivigatt.com> Cc: stable@kernel.org Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/stream.c')
-rw-r--r--sound/usb/stream.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 8951f77a7201..7db2f8958e79 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -393,6 +393,14 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
if (!csep && altsd->bNumEndpoints >= 2)
csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
+ /*
+ * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
+ * bytes after the first endpoint, go search the entire interface.
+ * Some devices have it directly *before* the standard endpoint.
+ */
+ if (!csep)
+ csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
+
if (!csep || csep->bLength < 7 ||
csep->bDescriptorSubtype != UAC_EP_GENERAL) {
snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"