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| author | Andrew Kephart <akephart@akephart.org> | 2011-08-21 13:34:13 -0700 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2011-08-24 10:08:49 +0000 |
| commit | f2e1fc9d5d12fbc06590ac4987dce6f79d86f1c7 (patch) | |
| tree | 07182ddaa42e9daaa3dacb5b7c19728c74768e5f /drivers/video/udlfb.c | |
| parent | 58e7c3b00114c48e0879e9fbafd37e0e0c2402cb (diff) | |
| download | op-kernel-dev-f2e1fc9d5d12fbc06590ac4987dce6f79d86f1c7.zip op-kernel-dev-f2e1fc9d5d12fbc06590ac4987dce6f79d86f1c7.tar.gz | |
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>
Diffstat (limited to 'drivers/video/udlfb.c')
| -rw-r--r-- | drivers/video/udlfb.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c index fecd2d3..0b77af7 100644 --- a/drivers/video/udlfb.c +++ b/drivers/video/udlfb.c @@ -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 */ - 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); + 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; } |
