usb: gadget: hid: don't STALL when processing a HID Descriptor request
authorSebastian Bauer <mail@sebastianbauer.info>
Thu, 21 Jul 2011 13:40:07 +0000 (15:40 +0200)
committerFelipe Balbi <balbi@ti.com>
Mon, 1 Aug 2011 19:06:47 +0000 (22:06 +0300)
This is a patch to fix an issue with the HID gadget which, at the moment,
returns STALL on a HID descriptor request. Essentially, the patch changes
the hid gadget such that a request for the HID descriptor is handled by
copying the descriptor into the response buffer, rather than falling
through the default case, in which the request is answered by a STALL.

Signed-off-by: Sebastian Bauer <mail@sebastianbauer.info>
Acked-by: Peter Korsgaard <peter.korsgaard@barco.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
drivers/usb/gadget/f_hid.c

index 403a48b..83a266b 100644 (file)
@@ -367,6 +367,13 @@ static int hidg_setup(struct usb_function *f,
        case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
                  | USB_REQ_GET_DESCRIPTOR):
                switch (value >> 8) {
+               case HID_DT_HID:
+                       VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n");
+                       length = min_t(unsigned short, length,
+                                                  hidg_desc.bLength);
+                       memcpy(req->buf, &hidg_desc, length);
+                       goto respond;
+                       break;
                case HID_DT_REPORT:
                        VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
                        length = min_t(unsigned short, length,