usb: gadget: f_fs: add ioctl returning ep descriptor

This patch introduces ioctl named FUNCTIONFS_ENDPOINT_DESC, which
returns endpoint descriptor to userspace. It works only if function
is active.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h
index 6d2a16b834bf..7c7a2feb0e6e 100644
--- a/include/uapi/linux/usb/functionfs.h
+++ b/include/uapi/linux/usb/functionfs.h
@@ -275,6 +275,12 @@ struct usb_functionfs_event {
  */
 #define FUNCTIONFS_ENDPOINT_REVMAP      _IO('g', 129)
 
+/*
+ * Returns endpoint descriptor. If function is not active returns -ENODEV.
+ */
+#define FUNCTIONFS_ENDPOINT_DESC        _IOR('g', 130, \
+                                             struct usb_endpoint_descriptor)
+
 
 
 #endif /* _UAPI__LINUX_FUNCTIONFS_H__ */