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authorLukasz Majewski <l.majewski@samsung.com>2013-03-01 15:30:18 +0100
committerMarek Vasut <marex@denx.de>2013-03-18 18:58:52 +0100
commitf7b4162eb1bddfa3008e65d4d3ed29d117dc1eb8 (patch)
tree1fc8603e8afbe394484d5f741e356bc2d50c9cc2
parentb2caefbb3344ff5eece7d4b1f3d8e583951d2a20 (diff)
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usb:composite:fix Provide function data when addressing device with only one interface
This commit fixes problems with some non-standard requests send with device address instead of interface address (bmRequestType.Receipent field). This happens with dfu-util (debian version: 0.5), which address non standard requests (like w_value=0x21 and bRequest=GET_DESCRIPTOR) to device. Without this fix, the above request is STALLED, and hence causes dfu-util to assume some standard configuration (packet size = 1024B instead of 4096B) In turn it displays following errors: Error obtaining DFU functional descriptor Warning: Assuming DFU version 1.0 Warning: Transfer size can not be detected ... Warning: Trying default transfer size 1024 This fix allows passing non-standard request to function setup code, where it shall be handled. Tested at: Trats (exynos4210) Tested with:DFU and UMS gadgets Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
-rw-r--r--drivers/usb/gadget/composite.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index ebb5131..2c5600e 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -859,6 +859,25 @@ unknown:
if (&f->list == &cdev->config->functions)
f = NULL;
break;
+ /*
+ * dfu-util (version 0.5) sets bmRequestType.Receipent = Device
+ * for non-standard request (w_value = 0x21,
+ * bRequest = GET_DESCRIPTOR in this case).
+ * When only one interface is registered (as it is done now),
+ * then this request shall be handled as it was requested for
+ * interface.
+ *
+ * In the below code it is checked if only one interface is
+ * present and proper function for it is extracted. Due to that
+ * function's setup (f->setup) is called to handle this
+ * special non-standard request.
+ */
+ case USB_RECIP_DEVICE:
+ debug("cdev->config->next_interface_id: %d intf: %d\n",
+ cdev->config->next_interface_id, intf);
+ if (cdev->config->next_interface_id == 1)
+ f = cdev->config->interface[intf];
+ break;
}
if (f && f->setup)