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uinput_linux.h
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uinput_linux.h
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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* 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 <[email protected]>
*
* Changes/Revisions:
* 0.5 08/13/2015 (David Herrmann <[email protected]> &
* Benjamin Tissoires <[email protected]>)
* - add UI_DEV_SETUP ioctl
* - add UI_ABS_SETUP ioctl
* - add UI_GET_VERSION ioctl
* 0.4 01/09/2014 (Benjamin Tissoires <[email protected]>)
* - add UI_GET_SYSNAME ioctl
* 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 <[email protected]>)
* - added force feedback support
* - added UI_SET_PHYS
* 0.1 20/06/2002
* - first public version
*/
#ifndef _UAPI__UINPUT_H_
#define _UAPI__UINPUT_H_
#include <linux/types.h>
#include <linux/input.h>
#define UINPUT_VERSION 5
#define UINPUT_MAX_NAME_SIZE 80
struct uinput_ff_upload {
__u32 request_id;
__s32 retval;
struct ff_effect effect;
struct ff_effect old;
};
struct uinput_ff_erase {
__u32 request_id;
__s32 retval;
__u32 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)
struct uinput_setup {
struct input_id id;
char name[UINPUT_MAX_NAME_SIZE];
__u32 ff_effects_max;
};
/**
* UI_DEV_SETUP - Set device parameters for setup
*
* This ioctl sets parameters for the input device to be created. It
* supersedes the old "struct uinput_user_dev" method, which wrote this data
* via write(). To actually set the absolute axes UI_ABS_SETUP should be
* used.
*
* The ioctl takes a "struct uinput_setup" object as argument. The fields of
* this object are as follows:
* id: See the description of "struct input_id". This field is
* copied unchanged into the new device.
* name: This is used unchanged as name for the new device.
* ff_effects_max: This limits the maximum numbers of force-feedback effects.
* See below for a description of FF with uinput.
*
* This ioctl can be called multiple times and will overwrite previous values.
* If this ioctl fails with -EINVAL, it is recommended to use the old
* "uinput_user_dev" method via write() as a fallback, in case you run on an
* old kernel that does not support this ioctl.
*
* This ioctl may fail with -EINVAL if it is not supported or if you passed
* incorrect values, -ENOMEM if the kernel runs out of memory or -EFAULT if the
* passed uinput_setup object cannot be read/written.
* If this call fails, partial data may have already been applied to the
* internal device.
*/
#define UI_DEV_SETUP _IOW(UINPUT_IOCTL_BASE, 3, struct uinput_setup)
struct uinput_abs_setup {
__u16 code; /* axis code */
/* __u16 filler; */
struct input_absinfo absinfo;
};
/**
* UI_ABS_SETUP - Set absolute axis information for the device to setup
*
* This ioctl sets one absolute axis information for the input device to be
* created. It supersedes the old "struct uinput_user_dev" method, which wrote
* part of this data and the content of UI_DEV_SETUP via write().
*
* The ioctl takes a "struct uinput_abs_setup" object as argument. The fields
* of this object are as follows:
* code: The corresponding input code associated with this axis
* (ABS_X, ABS_Y, etc...)
* absinfo: See "struct input_absinfo" for a description of this field.
* This field is copied unchanged into the kernel for the
* specified axis. If the axis is not enabled via
* UI_SET_ABSBIT, this ioctl will enable it.
*
* This ioctl can be called multiple times and will overwrite previous values.
* If this ioctl fails with -EINVAL, it is recommended to use the old
* "uinput_user_dev" method via write() as a fallback, in case you run on an
* old kernel that does not support this ioctl.
*
* This ioctl may fail with -EINVAL if it is not supported or if you passed
* incorrect values, -ENOMEM if the kernel runs out of memory or -EFAULT if the
* passed uinput_setup object cannot be read/written.
* If this call fails, partial data may have already been applied to the
* internal device.
*/
#define UI_ABS_SETUP _IOW(UINPUT_IOCTL_BASE, 4, struct uinput_abs_setup)
#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_SET_PROPBIT _IOW(UINPUT_IOCTL_BASE, 110, 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)
/**
* UI_GET_SYSNAME - get the sysfs name of the created uinput device
*
* @return the sysfs name of the created virtual input device.
* The complete sysfs path is then /sys/devices/virtual/input/--NAME--
* Usually, it is in the form "inputN"
*/
#define UI_GET_SYSNAME(len) _IOC(_IOC_READ, UINPUT_IOCTL_BASE, 44, len)
/**
* UI_GET_VERSION - Return version of uinput protocol
*
* This writes uinput protocol version implemented by the kernel into
* the integer pointed to by the ioctl argument. The protocol version
* is hard-coded in the kernel and is independent of the uinput device.
*/
#define UI_GET_VERSION _IOR(UINPUT_IOCTL_BASE, 45, unsigned int)
/*
* 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
struct uinput_user_dev {
char name[UINPUT_MAX_NAME_SIZE];
struct input_id id;
__u32 ff_effects_max;
__s32 absmax[ABS_CNT];
__s32 absmin[ABS_CNT];
__s32 absfuzz[ABS_CNT];
__s32 absflat[ABS_CNT];
};
#endif /* _UAPI__UINPUT_H_ */