233 lines
9.1 KiB
C
233 lines
9.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* User level driver support for input subsystem
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*
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* Heavily based on evdev.c by Vojtech Pavlik
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
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*
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* Changes/Revisions:
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* 0.5 08/13/2015 (David Herrmann <dh.herrmann@gmail.com> &
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* Benjamin Tissoires <benjamin.tissoires@redhat.com>)
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* - add UI_DEV_SETUP ioctl
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* - add UI_ABS_SETUP ioctl
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* - add UI_GET_VERSION ioctl
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* 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
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* - add UI_GET_SYSNAME ioctl
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* 0.3 24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>)
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* - update ff support for the changes in kernel interface
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* - add UINPUT_VERSION
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* 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
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* - added force feedback support
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* - added UI_SET_PHYS
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* 0.1 20/06/2002
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* - first public version
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*/
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#ifndef _UAPI__UINPUT_H_
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#define _UAPI__UINPUT_H_
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#include <linux/types.h>
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#include <linux/input.h>
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#define UINPUT_VERSION 5
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#define UINPUT_MAX_NAME_SIZE 80
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struct uinput_ff_upload {
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__u32 request_id;
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__s32 retval;
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struct ff_effect effect;
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struct ff_effect old;
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};
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struct uinput_ff_erase {
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__u32 request_id;
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__s32 retval;
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__u32 effect_id;
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};
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/* ioctl */
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#define UINPUT_IOCTL_BASE 'U'
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#define UI_DEV_CREATE _IO(UINPUT_IOCTL_BASE, 1)
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#define UI_DEV_DESTROY _IO(UINPUT_IOCTL_BASE, 2)
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struct uinput_setup {
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struct input_id id;
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char name[UINPUT_MAX_NAME_SIZE];
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__u32 ff_effects_max;
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};
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/**
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* UI_DEV_SETUP - Set device parameters for setup
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*
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* This ioctl sets parameters for the input device to be created. It
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* supersedes the old "struct uinput_user_dev" method, which wrote this data
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* via write(). To actually set the absolute axes UI_ABS_SETUP should be
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* used.
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*
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* The ioctl takes a "struct uinput_setup" object as argument. The fields of
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* this object are as follows:
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* id: See the description of "struct input_id". This field is
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* copied unchanged into the new device.
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* name: This is used unchanged as name for the new device.
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* ff_effects_max: This limits the maximum numbers of force-feedback effects.
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* See below for a description of FF with uinput.
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*
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* This ioctl can be called multiple times and will overwrite previous values.
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* If this ioctl fails with -EINVAL, it is recommended to use the old
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* "uinput_user_dev" method via write() as a fallback, in case you run on an
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* old kernel that does not support this ioctl.
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*
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* This ioctl may fail with -EINVAL if it is not supported or if you passed
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* incorrect values, -ENOMEM if the kernel runs out of memory or -EFAULT if the
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* passed uinput_setup object cannot be read/written.
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* If this call fails, partial data may have already been applied to the
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* internal device.
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*/
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#define UI_DEV_SETUP _IOW(UINPUT_IOCTL_BASE, 3, struct uinput_setup)
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struct uinput_abs_setup {
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__u16 code; /* axis code */
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/* __u16 filler; */
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struct input_absinfo absinfo;
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};
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/**
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* UI_ABS_SETUP - Set absolute axis information for the device to setup
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*
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* This ioctl sets one absolute axis information for the input device to be
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* created. It supersedes the old "struct uinput_user_dev" method, which wrote
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* part of this data and the content of UI_DEV_SETUP via write().
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*
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* The ioctl takes a "struct uinput_abs_setup" object as argument. The fields
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* of this object are as follows:
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* code: The corresponding input code associated with this axis
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* (ABS_X, ABS_Y, etc...)
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* absinfo: See "struct input_absinfo" for a description of this field.
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* This field is copied unchanged into the kernel for the
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* specified axis. If the axis is not enabled via
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* UI_SET_ABSBIT, this ioctl will enable it.
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*
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* This ioctl can be called multiple times and will overwrite previous values.
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* If this ioctl fails with -EINVAL, it is recommended to use the old
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* "uinput_user_dev" method via write() as a fallback, in case you run on an
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* old kernel that does not support this ioctl.
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*
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* This ioctl may fail with -EINVAL if it is not supported or if you passed
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* incorrect values, -ENOMEM if the kernel runs out of memory or -EFAULT if the
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* passed uinput_setup object cannot be read/written.
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* If this call fails, partial data may have already been applied to the
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* internal device.
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*/
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#define UI_ABS_SETUP _IOW(UINPUT_IOCTL_BASE, 4, struct uinput_abs_setup)
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#define UI_SET_EVBIT _IOW(UINPUT_IOCTL_BASE, 100, int)
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#define UI_SET_KEYBIT _IOW(UINPUT_IOCTL_BASE, 101, int)
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#define UI_SET_RELBIT _IOW(UINPUT_IOCTL_BASE, 102, int)
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#define UI_SET_ABSBIT _IOW(UINPUT_IOCTL_BASE, 103, int)
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#define UI_SET_MSCBIT _IOW(UINPUT_IOCTL_BASE, 104, int)
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#define UI_SET_LEDBIT _IOW(UINPUT_IOCTL_BASE, 105, int)
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#define UI_SET_SNDBIT _IOW(UINPUT_IOCTL_BASE, 106, int)
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#define UI_SET_FFBIT _IOW(UINPUT_IOCTL_BASE, 107, int)
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#define UI_SET_PHYS _IOW(UINPUT_IOCTL_BASE, 108, char*)
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#define UI_SET_SWBIT _IOW(UINPUT_IOCTL_BASE, 109, int)
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#define UI_SET_PROPBIT _IOW(UINPUT_IOCTL_BASE, 110, int)
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#define UI_BEGIN_FF_UPLOAD _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload)
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#define UI_END_FF_UPLOAD _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload)
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#define UI_BEGIN_FF_ERASE _IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase)
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#define UI_END_FF_ERASE _IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase)
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/**
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* UI_GET_SYSNAME - get the sysfs name of the created uinput device
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*
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* @return the sysfs name of the created virtual input device.
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* The complete sysfs path is then /sys/devices/virtual/input/--NAME--
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* Usually, it is in the form "inputN"
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*/
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#define UI_GET_SYSNAME(len) _IOC(_IOC_READ, UINPUT_IOCTL_BASE, 44, len)
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/**
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* UI_GET_VERSION - Return version of uinput protocol
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*
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* This writes uinput protocol version implemented by the kernel into
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* the integer pointed to by the ioctl argument. The protocol version
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* is hard-coded in the kernel and is independent of the uinput device.
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*/
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#define UI_GET_VERSION _IOR(UINPUT_IOCTL_BASE, 45, unsigned int)
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/*
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* To write a force-feedback-capable driver, the upload_effect
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* and erase_effect callbacks in input_dev must be implemented.
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* The uinput driver will generate a fake input event when one of
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* these callbacks are invoked. The userspace code then uses
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* ioctls to retrieve additional parameters and send the return code.
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* The callback blocks until this return code is sent.
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*
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* The described callback mechanism is only used if ff_effects_max
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* is set.
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*
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* To implement upload_effect():
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* 1. Wait for an event with type == EV_UINPUT and code == UI_FF_UPLOAD.
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* A request ID will be given in 'value'.
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* 2. Allocate a uinput_ff_upload struct, fill in request_id with
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* the 'value' from the EV_UINPUT event.
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* 3. Issue a UI_BEGIN_FF_UPLOAD ioctl, giving it the
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* uinput_ff_upload struct. It will be filled in with the
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* ff_effects passed to upload_effect().
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* 4. Perform the effect upload, and place a return code back into
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the uinput_ff_upload struct.
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* 5. Issue a UI_END_FF_UPLOAD ioctl, also giving it the
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* uinput_ff_upload_effect struct. This will complete execution
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* of our upload_effect() handler.
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*
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* To implement erase_effect():
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* 1. Wait for an event with type == EV_UINPUT and code == UI_FF_ERASE.
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* A request ID will be given in 'value'.
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* 2. Allocate a uinput_ff_erase struct, fill in request_id with
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* the 'value' from the EV_UINPUT event.
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* 3. Issue a UI_BEGIN_FF_ERASE ioctl, giving it the
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* uinput_ff_erase struct. It will be filled in with the
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* effect ID passed to erase_effect().
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* 4. Perform the effect erasure, and place a return code back
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* into the uinput_ff_erase struct.
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* 5. Issue a UI_END_FF_ERASE ioctl, also giving it the
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* uinput_ff_erase_effect struct. This will complete execution
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* of our erase_effect() handler.
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*/
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/*
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* This is the new event type, used only by uinput.
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* 'code' is UI_FF_UPLOAD or UI_FF_ERASE, and 'value'
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* is the unique request ID. This number was picked
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* arbitrarily, above EV_MAX (since the input system
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* never sees it) but in the range of a 16-bit int.
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*/
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#define EV_UINPUT 0x0101
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#define UI_FF_UPLOAD 1
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#define UI_FF_ERASE 2
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struct uinput_user_dev {
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char name[UINPUT_MAX_NAME_SIZE];
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struct input_id id;
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__u32 ff_effects_max;
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__s32 absmax[ABS_CNT];
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__s32 absmin[ABS_CNT];
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__s32 absfuzz[ABS_CNT];
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__s32 absflat[ABS_CNT];
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};
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#endif /* _UAPI__UINPUT_H_ */
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