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| -rw-r--r-- | include/uapi/linux/uinput.h | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/include/uapi/linux/uinput.h b/include/uapi/linux/uinput.h new file mode 100644 index 000000000..c9e677e3a --- /dev/null +++ b/include/uapi/linux/uinput.h @@ -0,0 +1,232 @@ +/* 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 _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_ */ |