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Commit f2e1fc9d authored by Andrew Kephart's avatar Andrew Kephart Committed by Florian Tobias Schandinat
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udlfb: Search config descriptor if not at device level



For at least one DisplayLink device, the vendor-specific information can
be found in the config descriptor instead of as a separate, device-level
descriptor.  This patch searches the current interface (of the current
config descriptor) for the DL vendor-specific descriptor.

Signed-off-by: default avatarAndrew Kephart <akephart@akephart.org>
Signed-off-by: default avatarBernie Thompson <bernie@plugable.com>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent 58e7c3b0
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+16 −5
Original line number Diff line number Diff line
@@ -1479,21 +1479,30 @@ static int dlfb_select_std_channel(struct dlfb_data *dev)
}

static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev,
					struct usb_device *usbdev)
					struct usb_interface *interface)
{
	char *desc;
	char *buf;
	char *desc_end;

	u8 total_len = 0;
	int total_len = 0;

	buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
	if (!buf)
		return false;
	desc = buf;

	total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
	total_len = usb_get_descriptor(interface_to_usbdev(interface),
					0x5f, /* vendor specific */
					0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);

	/* if not found, look in configuration descriptor */
	if (total_len < 0) {
		if (0 == usb_get_extra_descriptor(interface->cur_altsetting,
			0x5f, &desc))
			total_len = (int) desc[0];
	}

	if (total_len > 5) {
		pr_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \
			"%02x %02x %02x %02x %02x %02x %02x\n",
@@ -1534,6 +1543,8 @@ static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev,
			}
			desc += length;
		}
	} else {
		pr_info("vendor descriptor not available (%d)\n", total_len);
	}

	goto success;
@@ -1583,7 +1594,7 @@ static int dlfb_usb_probe(struct usb_interface *interface,

	dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */

	if (!dlfb_parse_vendor_descriptor(dev, usbdev)) {
	if (!dlfb_parse_vendor_descriptor(dev, interface)) {
		pr_err("firmware not recognized. Assume incompatible device\n");
		goto error;
	}