summaryrefslogtreecommitdiffstats
path: root/include/linux/uinput.h
blob: 1fd61eeed664c6958e4595aa455f4c3228807712 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
#ifndef __UINPUT_H_
#define __UINPUT_H_
/*
 *  User level driver support for input subsystem
 *
 * Heavily based on evdev.c by Vojtech Pavlik
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
 *
 * Changes/Revisions:
 *	0.3	24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>)
 *		- update ff support for the changes in kernel interface
 *		- add UINPUT_VERSION
 *	0.2	16/10/2004 (Micah Dowty <micah@navi.cx>)
 *		- added force feedback support
 *             - added UI_SET_PHYS
 *	0.1	20/06/2002
 *		- first public version
 */

#define UINPUT_VERSION		3

#ifdef __KERNEL__
#define UINPUT_MINOR		223
#define UINPUT_NAME		"uinput"
#define UINPUT_BUFFER_SIZE	16
#define UINPUT_NUM_REQUESTS	16

enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };

struct uinput_request {
	int			id;
	int			code;	/* UI_FF_UPLOAD, UI_FF_ERASE */

	int			retval;
	struct completion	done;

	union {
		int		effect_id;
		struct {
			struct ff_effect *effect;
			struct ff_effect *old;
		} upload;
	} u;
};

struct uinput_device {
	struct input_dev	*dev;
	struct mutex		mutex;
	enum uinput_state	state;
	wait_queue_head_t	waitq;
	unsigned char		ready;
	unsigned char		head;
	unsigned char		tail;
	struct input_event	buff[UINPUT_BUFFER_SIZE];
	int			ff_effects_max;

	struct uinput_request	*requests[UINPUT_NUM_REQUESTS];
	wait_queue_head_t	requests_waitq;
	spinlock_t		requests_lock;
};
#endif	/* __KERNEL__ */

struct uinput_ff_upload {
	int			request_id;
	int			retval;
	struct ff_effect	effect;
	struct ff_effect	old;
};

struct uinput_ff_erase {
	int			request_id;
	int			retval;
	int			effect_id;
};

/* ioctl */
#define UINPUT_IOCTL_BASE	'U'
#define UI_DEV_CREATE		_IO(UINPUT_IOCTL_BASE, 1)
#define UI_DEV_DESTROY		_IO(UINPUT_IOCTL_BASE, 2)

#define UI_SET_EVBIT		_IOW(UINPUT_IOCTL_BASE, 100, int)
#define UI_SET_KEYBIT		_IOW(UINPUT_IOCTL_BASE, 101, int)
#define UI_SET_RELBIT		_IOW(UINPUT_IOCTL_BASE, 102, int)
#define UI_SET_ABSBIT		_IOW(UINPUT_IOCTL_BASE, 103, int)
#define UI_SET_MSCBIT		_IOW(UINPUT_IOCTL_BASE, 104, int)
#define UI_SET_LEDBIT		_IOW(UINPUT_IOCTL_BASE, 105, int)
#define UI_SET_SNDBIT		_IOW(UINPUT_IOCTL_BASE, 106, int)
#define UI_SET_FFBIT		_IOW(UINPUT_IOCTL_BASE, 107, int)
#define UI_SET_PHYS		_IOW(UINPUT_IOCTL_BASE, 108, char*)
#define UI_SET_SWBIT		_IOW(UINPUT_IOCTL_BASE, 109, int)

#define UI_BEGIN_FF_UPLOAD	_IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload)
#define UI_END_FF_UPLOAD	_IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload)
#define UI_BEGIN_FF_ERASE	_IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase)
#define UI_END_FF_ERASE		_IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase)

/*
 * To write a force-feedback-capable driver, the upload_effect
 * and erase_effect callbacks in input_dev must be implemented.
 * The uinput driver will generate a fake input event when one of
 * these callbacks are invoked. The userspace code then uses
 * ioctls to retrieve additional parameters and send the return code.
 * The callback blocks until this return code is sent.
 *
 * The described callback mechanism is only used if ff_effects_max
 * is set.
 *
 * To implement upload_effect():
 *   1. Wait for an event with type == EV_UINPUT and code == UI_FF_UPLOAD.
 *      A request ID will be given in 'value'.
 *   2. Allocate a uinput_ff_upload struct, fill in request_id with
 *      the 'value' from the EV_UINPUT event.
 *   3. Issue a UI_BEGIN_FF_UPLOAD ioctl, giving it the
 *      uinput_ff_upload struct. It will be filled in with the
 *      ff_effects passed to upload_effect().
 *   4. Perform the effect upload, and place a return code back into
        the uinput_ff_upload struct.
 *   5. Issue a UI_END_FF_UPLOAD ioctl, also giving it the
 *      uinput_ff_upload_effect struct. This will complete execution
 *      of our upload_effect() handler.
 *
 * To implement erase_effect():
 *   1. Wait for an event with type == EV_UINPUT and code == UI_FF_ERASE.
 *      A request ID will be given in 'value'.
 *   2. Allocate a uinput_ff_erase struct, fill in request_id with
 *      the 'value' from the EV_UINPUT event.
 *   3. Issue a UI_BEGIN_FF_ERASE ioctl, giving it the
 *      uinput_ff_erase struct. It will be filled in with the
 *      effect ID passed to erase_effect().
 *   4. Perform the effect erasure, and place a return code back
 *      into the uinput_ff_erase struct.
 *   5. Issue a UI_END_FF_ERASE ioctl, also giving it the
 *      uinput_ff_erase_effect struct. This will complete execution
 *      of our erase_effect() handler.
 */

/*
 * This is the new event type, used only by uinput.
 * 'code' is UI_FF_UPLOAD or UI_FF_ERASE, and 'value'
 * is the unique request ID. This number was picked
 * arbitrarily, above EV_MAX (since the input system
 * never sees it) but in the range of a 16-bit int.
 */
#define EV_UINPUT		0x0101
#define UI_FF_UPLOAD		1
#define UI_FF_ERASE		2

#ifndef NBITS
#define NBITS(x) ((((x)-1)/(sizeof(long)*8))+1)
#endif	/* NBITS */

#define UINPUT_MAX_NAME_SIZE	80
struct uinput_user_dev {
	char name[UINPUT_MAX_NAME_SIZE];
	struct input_id id;
        int ff_effects_max;
        int absmax[ABS_MAX + 1];
        int absmin[ABS_MAX + 1];
        int absfuzz[ABS_MAX + 1];
        int absflat[ABS_MAX + 1];
};
#endif	/* __UINPUT_H_ */

OpenPOWER on IntegriCloud