usb_hid: add support for Battery Strength

This allows rockbox to report its battery status through the
HID Battery Strength method that is available through the
Device Controls usage page.

Change-Id: Ia7a7dd9b9d476dd9df5a5f5becabc5ae823e9a89

1 files changed, 3 insertions, 0 deletions

diff --git a/firmware/export/powermgmt.h b/firmware/export/powermgmt.h
index 235f5302f9..b7ca6772f3 100644
--- a/firmware/export/powermgmt.h
+++ b/firmware/export/powermgmt.h
@@ -166,6 +166,9 @@ void set_poweroff_timeout(int timeout);
 void set_battery_capacity(int capacity); /* set local battery capacity value */
 int  get_battery_capacity(void); /* get local battery capacity value */
 void set_battery_type(int type); /* set local battery type */
+#ifdef USB_ENABLE_HID
+void set_battery_reporting(bool enable);
+#endif
 
 void set_sleeptimer_duration(int minutes);
 int get_sleep_timer(void);