Some drivers send the idle command directly to underlying device,
creating an unwanted dependency on the underlying transport layer.
This patch adds hid_hw_idle() to the interface, thereby removing
usbhid from the lion share of the drivers.

Signed-off-by: Benjamin Tissoires <redacted>
---
 drivers/hid/usbhid/hid-core.c | 15 +++++++++++++++
 include/linux/hid.h           | 19 +++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 420466b..effcd3d 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c

@@ -1253,6 +1253,20 @@ static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int r
 	}
 }
 
+static int usbhid_idle(struct hid_device *hid, int report, int idle,
+		int reqtype)