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b31c9d9dc3
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>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2007 Jiri Kosina
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*/
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#ifndef _HIDRAW_H
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#define _HIDRAW_H
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#include <uapi/linux/hidraw.h>
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struct hidraw {
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unsigned int minor;
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int exist;
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int open;
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wait_queue_head_t wait;
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struct hid_device *hid;
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struct device *dev;
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spinlock_t list_lock;
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struct list_head list;
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};
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struct hidraw_report {
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__u8 *value;
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int len;
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};
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struct hidraw_list {
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struct hidraw_report buffer[HIDRAW_BUFFER_SIZE];
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int head;
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int tail;
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struct fasync_struct *fasync;
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struct hidraw *hidraw;
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struct list_head node;
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struct mutex read_mutex;
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bool revoked;
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};
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#ifdef CONFIG_HIDRAW
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int hidraw_init(void);
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void hidraw_exit(void);
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int hidraw_report_event(struct hid_device *, u8 *, int);
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int hidraw_connect(struct hid_device *);
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void hidraw_disconnect(struct hid_device *);
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#else
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static inline int hidraw_init(void) { return 0; }
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static inline void hidraw_exit(void) { }
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static inline int hidraw_report_event(struct hid_device *hid, u8 *data, int len) { return 0; }
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static inline int hidraw_connect(struct hid_device *hid) { return -1; }
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static inline void hidraw_disconnect(struct hid_device *hid) { }
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#endif
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#endif
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