dlan17/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

HID: hidraw: add HIDIOCREVOKE ioctl

Browse Source 
There is a need for userspace applications to open HID devices directly.
Use-cases include configuration of gaming mice or direct access to
joystick devices. The latter is currently handled by the uaccess tag in
systemd, other devices include more custom/local configurations or just
sudo.

A better approach is what we already have for evdev devices: give the
application a file descriptor and revoke it when it may no longer access
that device.

This patch is the hidraw equivalent to the EVIOCREVOKE ioctl, see
commit c7dc65737c ("Input: evdev - add EVIOCREVOKE ioctl") for full
details.

An MR for systemd-logind has been filed here:
https://github.com/systemd/systemd/pull/33970

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Link: https://patch.msgid.link/20240827-hidraw-revoke-v5-1-d004a7451aea@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Peter Hutterer
2024-08-29 10:39:37 +02:00
committed by Benjamin Tissoires
parent 6e4436539a
commit b31c9d9dc3
3 changed files with 37 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/uapi/linux/hidraw.h
+1
View File
@@ -46,6 +46,7 @@ struct hidraw_devinfo {
/* The first byte of SOUTPUT and GOUTPUT is the report number */
#define HIDIOCSOUTPUT(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x0B, len)
#define HIDIOCGOUTPUT(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x0C, len)
#define HIDIOCREVOKE _IOW('H', 0x0D, int) /* Revoke device access */
#define HIDRAW_FIRST_MINOR 0
#define HIDRAW_MAX_DEVICES 64