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authorJerry Zhang <zhangjerry@google.com>2017-04-19 18:23:38 -0700
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-06-02 11:22:31 +0300
commit222155de45573e978cda988b7efc7d4e7b9a8ff9 (patch)
treeadcb3c45cb941485794fa7be6a40155a3b7e7d7f /include/uapi/linux/usb
parent8a8b161df5ce06ef5a315899f83978e765be09e8 (diff)
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usb: gadget: function: f_fs: Let ffs_epfile_ioctl wait for enable.
This allows users to make an ioctl call as the first action on a connection. Ex, some functions might want to get endpoint size before making any i/os. Previously, calling ioctls before read/write would depending on the timing of endpoints being enabled. ESHUTDOWN is now a possible return value and ENODEV is not, so change docs accordingly. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Jerry Zhang <zhangjerry@google.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'include/uapi/linux/usb')
-rw-r--r--include/uapi/linux/usb/functionfs.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h
index 062606f02309..f913d08ab7bb 100644
--- a/include/uapi/linux/usb/functionfs.h
+++ b/include/uapi/linux/usb/functionfs.h
@@ -275,13 +275,14 @@ struct usb_functionfs_event {
#define FUNCTIONFS_INTERFACE_REVMAP _IO('g', 128)
/*
- * Returns real bEndpointAddress of an endpoint. If function is not
- * active returns -ENODEV.
+ * Returns real bEndpointAddress of an endpoint. If endpoint shuts down
+ * during the call, returns -ESHUTDOWN.
*/
#define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129)
/*
- * Returns endpoint descriptor. If function is not active returns -ENODEV.
+ * Returns endpoint descriptor. If endpoint shuts down during the call,
+ * returns -ESHUTDOWN.
*/
#define FUNCTIONFS_ENDPOINT_DESC _IOR('g', 130, \
struct usb_endpoint_descriptor)