include/linux/uinput.h

   1 #ifndef __UINPUT_H_
   2 #define __UINPUT_H_
   3 /*
   4  *  User level driver support for input subsystem
   5  *
   6  * Heavily based on evdev.c by Vojtech Pavlik
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
  23  *
  24  * Changes/Revisions:
  25  *      0.2     16/10/2004 (Micah Dowty <micah@navi.cx>)
  26  *              - added force feedback support
  27  *             - added UI_SET_PHYS
  28  *      0.1     20/06/2002
  29  *              - first public version
  30  */
  31 #ifdef __KERNEL__
  32 #define UINPUT_MINOR            223
  33 #define UINPUT_NAME             "uinput"
  34 #define UINPUT_BUFFER_SIZE      16
  35 #define UINPUT_NUM_REQUESTS     16
  36
  37 /* state flags => bit index for {set|clear|test}_bit ops */
  38 #define UIST_CREATED            0
  39
  40 struct uinput_request {
  41         int                     id;
  42         int                     code;   /* UI_FF_UPLOAD, UI_FF_ERASE */
  43
  44         int                     retval;
  45         wait_queue_head_t       waitq;
  46         int                     completed;
  47
  48         union {
  49                 int             effect_id;
  50                 struct ff_effect* effect;
  51         } u;
  52 };
  53
  54 struct uinput_device {
  55         struct input_dev        *dev;
  56         unsigned long           state;
  57         wait_queue_head_t       waitq;
  58         unsigned char           ready,
  59                                 head,
  60                                 tail;
  61         struct input_event      buff[UINPUT_BUFFER_SIZE];
  62
  63         struct uinput_request   *requests[UINPUT_NUM_REQUESTS];
  64         wait_queue_head_t       requests_waitq;
  65         struct semaphore        requests_sem;
  66 };
  67 #endif  /* __KERNEL__ */
  68
  69 struct uinput_ff_upload {
  70         int                     request_id;
  71         int                     retval;
  72         struct ff_effect        effect;
  73 };
  74
  75 struct uinput_ff_erase {
  76         int                     request_id;
  77         int                     retval;
  78         int                     effect_id;
  79 };
  80
  81 /* ioctl */
  82 #define UINPUT_IOCTL_BASE       'U'
  83 #define UI_DEV_CREATE           _IO(UINPUT_IOCTL_BASE, 1)
  84 #define UI_DEV_DESTROY          _IO(UINPUT_IOCTL_BASE, 2)
  85
  86 #define UI_SET_EVBIT            _IOW(UINPUT_IOCTL_BASE, 100, int)
  87 #define UI_SET_KEYBIT           _IOW(UINPUT_IOCTL_BASE, 101, int)
  88 #define UI_SET_RELBIT           _IOW(UINPUT_IOCTL_BASE, 102, int)
  89 #define UI_SET_ABSBIT           _IOW(UINPUT_IOCTL_BASE, 103, int)
  90 #define UI_SET_MSCBIT           _IOW(UINPUT_IOCTL_BASE, 104, int)
  91 #define UI_SET_LEDBIT           _IOW(UINPUT_IOCTL_BASE, 105, int)
  92 #define UI_SET_SNDBIT           _IOW(UINPUT_IOCTL_BASE, 106, int)
  93 #define UI_SET_FFBIT            _IOW(UINPUT_IOCTL_BASE, 107, int)
  94 #define UI_SET_PHYS             _IOW(UINPUT_IOCTL_BASE, 108, char*)
  95
  96 #define UI_BEGIN_FF_UPLOAD      _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload)
  97 #define UI_END_FF_UPLOAD        _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload)
  98 #define UI_BEGIN_FF_ERASE       _IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase)
  99 #define UI_END_FF_ERASE         _IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase)
 100
 101 /* To write a force-feedback-capable driver, the upload_effect
 102  * and erase_effect callbacks in input_dev must be implemented.
 103  * The uinput driver will generate a fake input event when one of
 104  * these callbacks are invoked. The userspace code then uses
 105  * ioctls to retrieve additional parameters and send the return code.
 106  * The callback blocks until this return code is sent.
 107  *
 108  * The described callback mechanism is only used if EV_FF is set.
 109  * Otherwise, default implementations of upload_effect and erase_effect
 110  * are used.
 111  *
 112  * To implement upload_effect():
 113  *   1. Wait for an event with type==EV_UINPUT and code==UI_FF_UPLOAD.
 114  *      A request ID will be given in 'value'.
 115  *   2. Allocate a uinput_ff_upload struct, fill in request_id with
 116  *      the 'value' from the EV_UINPUT event.
 117  *   3. Issue a UI_BEGIN_FF_UPLOAD ioctl, giving it the
 118  *      uinput_ff_upload struct. It will be filled in with the
 119  *      ff_effect passed to upload_effect().
 120  *   4. Perform the effect upload, and place the modified ff_effect
 121  *      and a return code back into the uinput_ff_upload struct.
 122  *   5. Issue a UI_END_FF_UPLOAD ioctl, also giving it the
 123  *      uinput_ff_upload_effect struct. This will complete execution
 124  *      of our upload_effect() handler.
 125  *
 126  * To implement erase_effect():
 127  *   1. Wait for an event with type==EV_UINPUT and code==UI_FF_ERASE.
 128  *      A request ID will be given in 'value'.
 129  *   2. Allocate a uinput_ff_erase struct, fill in request_id with
 130  *      the 'value' from the EV_UINPUT event.
 131  *   3. Issue a UI_BEGIN_FF_ERASE ioctl, giving it the
 132  *      uinput_ff_erase struct. It will be filled in with the
 133  *      effect ID passed to erase_effect().
 134  *   4. Perform the effect erasure, and place a return code back
 135  *      into the uinput_ff_erase struct.
 136  *      and a return code back into the uinput_ff_erase struct.
 137  *   5. Issue a UI_END_FF_ERASE ioctl, also giving it the
 138  *      uinput_ff_erase_effect struct. This will complete execution
 139  *      of our erase_effect() handler.
 140  */
 141
 142 /* This is the new event type, used only by uinput.
 143  * 'code' is UI_FF_UPLOAD or UI_FF_ERASE, and 'value'
 144  * is the unique request ID. This number was picked
 145  * arbitrarily, above EV_MAX (since the input system
 146  * never sees it) but in the range of a 16-bit int.
 147  */
 148 #define EV_UINPUT               0x0101
 149 #define UI_FF_UPLOAD            1
 150 #define UI_FF_ERASE             2
 151
 152 #ifndef NBITS
 153 #define NBITS(x) ((((x)-1)/(sizeof(long)*8))+1)
 154 #endif  /* NBITS */
 155
 156 #define UINPUT_MAX_NAME_SIZE    80
 157 struct uinput_user_dev {
 158         char name[UINPUT_MAX_NAME_SIZE];
 159         struct input_id id;
 160         int ff_effects_max;
 161         int absmax[ABS_MAX + 1];
 162         int absmin[ABS_MAX + 1];
 163         int absfuzz[ABS_MAX + 1];
 164         int absflat[ABS_MAX + 1];
 165 };
 166 #endif  /* __UINPUT_H_ */
 167