Commit faf8d117 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Jaroslav Kysela
Browse files

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



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: default avatarClemens Ladisch <clemens@ladisch.de>
parent 474167d6

sound/usb/usbaudio.c

+4 −3
Original line number Diff line number Diff line
@@ -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 */

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