diff options
| author | Jason Gerecke <killertofu@gmail.com> | 2017-07-24 09:46:18 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-14 10:04:46 +0100 |
| commit | e1e84bd83f1d2eb4d37ad1b62aa67c29665e1184 (patch) | |
| tree | b94b417765edf1acd5c8f92d8f6c863bf053ba4e /include | |
| parent | 575a0d95491df8cb6d0f566562c8edda4fcc5bb1 (diff) | |
HID: introduce hid_is_using_ll_driver
commit fc2237a724a9e448599076d7d23497f51e2f7441 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hid.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/hid.h b/include/linux/hid.h index 2ed6850356ea..c014f095dcac 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -762,6 +762,17 @@ struct hid_ll_driver { int (*idle)(struct hid_device *hdev, int report, int idle, int reqtype); }; +extern struct hid_ll_driver i2c_hid_ll_driver; +extern struct hid_ll_driver hidp_hid_driver; +extern struct hid_ll_driver uhid_hid_driver; +extern struct hid_ll_driver usb_hid_driver; + +static inline bool hid_is_using_ll_driver(struct hid_device *hdev, + struct hid_ll_driver *driver) +{ + return hdev->ll_driver == driver; +} + #define PM_HINT_FULLON 1<<5 #define PM_HINT_NORMAL 1<<1 |