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: Andrew Kephart <akephart@akephart.org> Signed-off-by: Bernie Thompson <bernie@plugable.com> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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1 changed files with 16 additions and 5 deletions
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@ -1479,21 +1479,30 @@ static int dlfb_select_std_channel(struct dlfb_data *dev)
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}
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static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev,
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struct usb_device *usbdev)
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struct usb_interface *interface)
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{
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char *desc;
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char *buf;
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char *desc_end;
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u8 total_len = 0;
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int total_len = 0;
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buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
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if (!buf)
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return false;
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desc = buf;
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total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
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total_len = usb_get_descriptor(interface_to_usbdev(interface),
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0x5f, /* vendor specific */
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0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
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/* if not found, look in configuration descriptor */
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if (total_len < 0) {
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if (0 == usb_get_extra_descriptor(interface->cur_altsetting,
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0x5f, &desc))
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total_len = (int) desc[0];
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}
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if (total_len > 5) {
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pr_info("vendor descriptor length:%x data:%02x %02x %02x %02x" \
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"%02x %02x %02x %02x %02x %02x %02x\n",
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@ -1534,6 +1543,8 @@ static int dlfb_parse_vendor_descriptor(struct dlfb_data *dev,
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}
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desc += length;
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}
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} else {
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pr_info("vendor descriptor not available (%d)\n", total_len);
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}
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goto success;
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@ -1583,7 +1594,7 @@ static int dlfb_usb_probe(struct usb_interface *interface,
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dev->sku_pixel_limit = 2048 * 1152; /* default to maximum */
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if (!dlfb_parse_vendor_descriptor(dev, usbdev)) {
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if (!dlfb_parse_vendor_descriptor(dev, interface)) {
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pr_err("firmware not recognized. Assume incompatible device\n");
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goto error;
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}
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