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uinput.h
/* 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 <aris@cathedrallabs.org> * * Changes/Revisions: * 0.5 08/13/2015 (David Herrmann <dh.herrmann@gmail.com> & * Benjamin Tissoires <benjamin.tissoires@redhat.com>) * - add UI_DEV_SETUP ioctl * - add UI_ABS_SETUP ioctl * - add UI_GET_VERSION ioctl * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>) * - 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 <micah@navi.cx>) * - added force feedback support * - added UI_SET_PHYS * 0.1 20/06/2002 * - first public version */ #ifndef __UINPUT_H_ #define __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 /* __UINPUT_H_ */
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