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[ALSA] usb-audio: add workaround for CSR Bluetooth Headphones (Saitek A-250)

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Some devices don't have the required class-specific endpoint descriptors.
Instead of making this case an error, this patch makes the driver guess the
endpoint attributes.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2006-05-18 09:35:15 +02:00 committed by Jaroslav Kysela
parent 474167d646
commit faf8d11743
1 changed files with 4 additions and 3 deletions
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7
sound/usb/usbaudio.c
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@ -2627,9 +2627,10 @@ static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
if (!csep && altsd->bNumEndpoints >= 2)
csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
if (!csep || csep[0] < 7 || csep[2] != EP_GENERAL) {
snd_printk(KERN_ERR "%d:%u:%d : no or invalid class specific endpoint descriptor\n",
snd_printk(KERN_WARN "%d:%u:%d : no or invalid"
" class specific endpoint descriptor\n",
dev->devnum, iface_no, altno);
continue;
csep = NULL;
}
fp = kmalloc(sizeof(*fp), GFP_KERNEL);
@ -2648,7 +2649,7 @@ static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
* (fp->maxpacksize & 0x7ff);
fp->attributes = csep[3];
fp->attributes = csep ? csep[3] : 0;
/* some quirks for attributes here */