usb: gadget: f_ecm: Add get_status callback

commit 8e38202 upstream.

When host sends GET_STATUS to ECM interface, handle the request
from the function driver. Since the interface is wakeup capable,
set the corresponding bit, and set RW bit if the function is
already armed for wakeup by the host.

Cc: stable <[email protected]>
Fixes: 481c225 ("usb: gadget: Handle function suspend feature selector")
Signed-off-by: Prashanth K <[email protected]>
Reviewed-by: Thinh Nguyen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit 75f23e49add86a2ede5214dd03f3e3976197a880)
Signed-off-by: Jack Vogel <[email protected]>

Author: Prashanth K

drivers/usb/gadget/function/f_ecm.c

@@ -892,6 +892,12 @@ static void ecm_resume(struct usb_function *f)
 	gether_resume(&ecm->port);
 }
 
+static int ecm_get_status(struct usb_function *f)
+{
+	return (f->func_wakeup_armed ? USB_INTRF_STAT_FUNC_RW : 0) |
+		USB_INTRF_STAT_FUNC_RW_CAP;
+}
+
 static void ecm_free(struct usb_function *f)
 {
 	struct f_ecm *ecm;
@@ -960,6 +966,7 @@ static struct usb_function *ecm_alloc(struct usb_function_instance *fi)
 	ecm->port.func.disable = ecm_disable;
 	ecm->port.func.free_func = ecm_free;
 	ecm->port.func.suspend = ecm_suspend;
+	ecm->port.func.get_status = ecm_get_status;
 	ecm->port.func.resume = ecm_resume;
 
 	return &ecm->port.func;