HID: introduce hid_is_using_ll_driver
authorJason Gerecke <killertofu@gmail.com>
Mon, 24 Jul 2017 16:46:18 +0000 (09:46 -0700)
committerJiri Kosina <jkosina@suse.cz>
Thu, 27 Jul 2017 13:14:28 +0000 (15:14 +0200)
commitfc2237a724a9e448599076d7d23497f51e2f7441
tree0f6fc077d1452bba1d2e690d08f6bef622f20919
parentbc35f73aa62f51b80f769d3a6617f4a4ba11d81e
HID: introduce hid_is_using_ll_driver

Although HID itself is transport-agnostic, occasionally a driver may
want to interact with the low-level transport that a device is connected
through. To do this, we need to know what kind of bus is in use. The
first guess may be to look at the 'bus' field of the 'struct hid_device',
but this field may be emulated in some cases (e.g. uhid).

More ideally, we can check which ll_driver a device is using. This
function introduces a 'hid_is_using_ll_driver' function and makes the
'struct hid_ll_driver' of the four most common transports accessible
through hid.h.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Acked-By: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
drivers/hid/i2c-hid/i2c-hid.c
drivers/hid/uhid.c
drivers/hid/usbhid/hid-core.c
include/linux/hid.h
net/bluetooth/hidp/core.c