/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Copyright (c) 1999-2002 Vojtech Pavlik
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#ifndef _INPUT_H
#define _INPUT_H


#include <sys/time.h>
#include <sys/types.h>
#include "standard-headers/linux/types.h"

#include "standard-headers/linux/input-event-codes.h"

/*
 * The event structure itself
 */

struct input_event {
        struct timeval time;
        uint16_t type;
        uint16_t code;
        int32_t value;
};

/*
 * Protocol version.
 */

#define EV_VERSION              0x010001

/*
 * IOCTLs (0x00 - 0x7f)
 */

struct input_id {
        uint16_t bustype;
        uint16_t vendor;
        uint16_t product;
        uint16_t version;
};

/**
 * struct input_absinfo - used by EVIOCGABS/EVIOCSABS ioctls
 * @value: latest reported value for the axis.
 * @minimum: specifies minimum value for the axis.
 * @maximum: specifies maximum value for the axis.
 * @fuzz: specifies fuzz value that is used to filter noise from
 *      the event stream.
 * @flat: values that are within this value will be discarded by
 *      joydev interface and reported as 0 instead.
 * @resolution: specifies resolution for the values reported for
 *      the axis.
 *
 * Note that input core does not clamp reported values to the
 * [minimum, maximum] limits, such task is left to userspace.
 *
 * The default resolution for main axes (ABS_X, ABS_Y, ABS_Z)
 * is reported in units per millimeter (units/mm), resolution
 * for rotational axes (ABS_RX, ABS_RY, ABS_RZ) is reported
 * in units per radian.
 * When INPUT_PROP_ACCELEROMETER is set the resolution changes.
 * The main axes (ABS_X, ABS_Y, ABS_Z) are then reported in
 * in units per g (units/g) and in units per degree per second
 * (units/deg/s) for rotational axes (ABS_RX, ABS_RY, ABS_RZ).
 */
struct input_absinfo {
        int32_t value;
        int32_t minimum;
        int32_t maximum;
        int32_t fuzz;
        int32_t flat;
        int32_t resolution;
};

/**
 * struct input_keymap_entry - used by EVIOCGKEYCODE/EVIOCSKEYCODE ioctls
 * @scancode: scancode represented in machine-endian form.
 * @len: length of the scancode that resides in @scancode buffer.
 * @index: index in the keymap, may be used instead of scancode
 * @flags: allows to specify how kernel should handle the request. For
 *      example, setting INPUT_KEYMAP_BY_INDEX flag indicates that kernel
 *      should perform lookup in keymap by @index instead of @scancode
 * @keycode: key code assigned to this scancode
 *
 * The structure is used to retrieve and modify keymap data. Users have
 * option of performing lookup either by @scancode itself or by @index
 * in keymap entry. EVIOCGKEYCODE will also return scancode or index
 * (depending on which element was used to perform lookup).
 */
struct input_keymap_entry {
#define INPUT_KEYMAP_BY_INDEX   (1 << 0)
        uint8_t  flags;
        uint8_t  len;
        uint16_t index;
        uint32_t keycode;
        uint8_t  scancode[32];
};

struct input_mask {
        uint32_t type;
        uint32_t codes_size;
        uint64_t codes_ptr;
};

#define EVIOCGVERSION           _IOR('E', 0x01, int)                    /* get driver version */
#define EVIOCGID                _IOR('E', 0x02, struct input_id)        /* get device ID */
#define EVIOCGREP               _IOR('E', 0x03, unsigned int[2])        /* get repeat settings */
#define EVIOCSREP               _IOW('E', 0x03, unsigned int[2])        /* set repeat settings */

#define EVIOCGKEYCODE           _IOR('E', 0x04, unsigned int[2])        /* get keycode */
#define EVIOCGKEYCODE_V2        _IOR('E', 0x04, struct input_keymap_entry)
#define EVIOCSKEYCODE           _IOW('E', 0x04, unsigned int[2])        /* set keycode */
#define EVIOCSKEYCODE_V2        _IOW('E', 0x04, struct input_keymap_entry)

#define EVIOCGNAME(len)         _IOC(_IOC_READ, 'E', 0x06, len)         /* get device name */
#define EVIOCGPHYS(len)         _IOC(_IOC_READ, 'E', 0x07, len)         /* get physical location */
#define EVIOCGUNIQ(len)         _IOC(_IOC_READ, 'E', 0x08, len)         /* get unique identifier */
#define EVIOCGPROP(len)         _IOC(_IOC_READ, 'E', 0x09, len)         /* get device properties */

/**
 * EVIOCGMTSLOTS(len) - get MT slot values
 * @len: size of the data buffer in bytes
 *
 * The ioctl buffer argument should be binary equivalent to
 *
 * struct input_mt_request_layout {
 *      uint32_t code;
 *      int32_t values[num_slots];
 * };
 *
 * where num_slots is the (arbitrary) number of MT slots to extract.
 *
 * The ioctl size argument (len) is the size of the buffer, which
 * should satisfy len = (num_slots + 1) * sizeof(int32_t).  If len is
 * too small to fit all available slots, the first num_slots are
 * returned.
 *
 * Before the call, code is set to the wanted ABS_MT event type. On
 * return, values[] is filled with the slot values for the specified
 * ABS_MT code.
 *
 * If the request code is not an ABS_MT value, -EINVAL is returned.
 */
#define EVIOCGMTSLOTS(len)      _IOC(_IOC_READ, 'E', 0x0a, len)

#define EVIOCGKEY(len)          _IOC(_IOC_READ, 'E', 0x18, len)         /* get global key state */
#define EVIOCGLED(len)          _IOC(_IOC_READ, 'E', 0x19, len)         /* get all LEDs */
#define EVIOCGSND(len)          _IOC(_IOC_READ, 'E', 0x1a, len)         /* get all sounds status */
#define EVIOCGSW(len)           _IOC(_IOC_READ, 'E', 0x1b, len)         /* get all switch states */

#define EVIOCGBIT(ev,len)       _IOC(_IOC_READ, 'E', 0x20 + (ev), len)  /* get event bits */
#define EVIOCGABS(abs)          _IOR('E', 0x40 + (abs), struct input_absinfo)   /* get abs value/limits */
#define EVIOCSABS(abs)          _IOW('E', 0xc0 + (abs), struct input_absinfo)   /* set abs value/limits */

#define EVIOCSFF                _IOW('E', 0x80, struct ff_effect)       /* send a force effect to a force feedback device */
#define EVIOCRMFF               _IOW('E', 0x81, int)                    /* Erase a force effect */
#define EVIOCGEFFECTS           _IOR('E', 0x84, int)                    /* Report number of effects playable at the same time */

#define EVIOCGRAB               _IOW('E', 0x90, int)                    /* Grab/Release device */
#define EVIOCREVOKE             _IOW('E', 0x91, int)                    /* Revoke device access */

/**
 * EVIOCGMASK - Retrieve current event mask
 *
 * This ioctl allows user to retrieve the current event mask for specific
 * event type. The argument must be of type "struct input_mask" and
 * specifies the event type to query, the address of the receive buffer and
 * the size of the receive buffer.
 *
 * The event mask is a per-client mask that specifies which events are
 * forwarded to the client. Each event code is represented by a single bit
 * in the event mask. If the bit is set, the event is passed to the client
 * normally. Otherwise, the event is filtered and will never be queued on
 * the client's receive buffer.
 *
 * Event masks do not affect global state of the input device. They only
 * affect the file descriptor they are applied to.
 *
 * The default event mask for a client has all bits set, i.e. all events
 * are forwarded to the client. If the kernel is queried for an unknown
 * event type or if the receive buffer is larger than the number of
 * event codes known to the kernel, the kernel returns all zeroes for those
 * codes.
 *
 * At maximum, codes_size bytes are copied.
 *
 * This ioctl may fail with ENODEV in case the file is revoked, EFAULT
 * if the receive-buffer points to invalid memory, or EINVAL if the kernel
 * does not implement the ioctl.
 */
#define EVIOCGMASK              _IOR('E', 0x92, struct input_mask)      /* Get event-masks */

/**
 * EVIOCSMASK - Set event mask
 *
 * This ioctl is the counterpart to EVIOCGMASK. Instead of receiving the
 * current event mask, this changes the client's event mask for a specific
 * type.  See EVIOCGMASK for a description of event-masks and the
 * argument-type.
 *
 * This ioctl provides full forward compatibility. If the passed event type
 * is unknown to the kernel, or if the number of event codes specified in
 * the mask is bigger than what is known to the kernel, the ioctl is still
 * accepted and applied. However, any unknown codes are left untouched and
 * stay cleared. That means, the kernel always filters unknown codes
 * regardless of what the client requests.  If the new mask doesn't cover
 * all known event-codes, all remaining codes are automatically cleared and
 * thus filtered.
 *
 * This ioctl may fail with ENODEV in case the file is revoked. EFAULT is
 * returned if the receive-buffer points to invalid memory. EINVAL is returned
 * if the kernel does not implement the ioctl.
 */
#define EVIOCSMASK              _IOW('E', 0x93, struct input_mask)      /* Set event-masks */

#define EVIOCSCLOCKID           _IOW('E', 0xa0, int)                    /* Set clockid to be used for timestamps */

/*
 * IDs.
 */

#define ID_BUS                  0
#define ID_VENDOR               1
#define ID_PRODUCT              2
#define ID_VERSION              3

#define BUS_PCI                 0x01
#define BUS_ISAPNP              0x02
#define BUS_USB                 0x03
#define BUS_HIL                 0x04
#define BUS_BLUETOOTH           0x05
#define BUS_VIRTUAL             0x06

#define BUS_ISA                 0x10
#define BUS_I8042               0x11
#define BUS_XTKBD               0x12
#define BUS_RS232               0x13
#define BUS_GAMEPORT            0x14
#define BUS_PARPORT             0x15
#define BUS_AMIGA               0x16
#define BUS_ADB                 0x17
#define BUS_I2C                 0x18
#define BUS_HOST                0x19
#define BUS_GSC                 0x1A
#define BUS_ATARI               0x1B
#define BUS_SPI                 0x1C
#define BUS_RMI                 0x1D
#define BUS_CEC                 0x1E
#define BUS_INTEL_ISHTP         0x1F

/*
 * MT_TOOL types
 */
#define MT_TOOL_FINGER          0
#define MT_TOOL_PEN             1
#define MT_TOOL_PALM            2
#define MT_TOOL_MAX             2

/*
 * Values describing the status of a force-feedback effect
 */
#define FF_STATUS_STOPPED       0x00
#define FF_STATUS_PLAYING       0x01
#define FF_STATUS_MAX           0x01

/*
 * Structures used in ioctls to upload effects to a device
 * They are pieces of a bigger structure (called ff_effect)
 */

/*
 * All duration values are expressed in ms. Values above 32767 ms (0x7fff)
 * should not be used and have unspecified results.
 */

/**
 * struct ff_replay - defines scheduling of the force-feedback effect
 * @length: duration of the effect
 * @delay: delay before effect should start playing
 */
struct ff_replay {
        uint16_t length;
        uint16_t delay;
};

/**
 * struct ff_trigger - defines what triggers the force-feedback effect
 * @button: number of the button triggering the effect
 * @interval: controls how soon the effect can be re-triggered
 */
struct ff_trigger {
        uint16_t button;
        uint16_t interval;
};

/**
 * struct ff_envelope - generic force-feedback effect envelope
 * @attack_length: duration of the attack (ms)
 * @attack_level: level at the beginning of the attack
 * @fade_length: duration of fade (ms)
 * @fade_level: level at the end of fade
 *
 * The @attack_level and @fade_level are absolute values; when applying
 * envelope force-feedback core will convert to positive/negative
 * value based on polarity of the default level of the effect.
 * Valid range for the attack and fade levels is 0x0000 - 0x7fff
 */
struct ff_envelope {
        uint16_t attack_length;
        uint16_t attack_level;
        uint16_t fade_length;
        uint16_t fade_level;
};

/**
 * struct ff_constant_effect - defines parameters of a constant force-feedback effect
 * @level: strength of the effect; may be negative
 * @envelope: envelope data
 */
struct ff_constant_effect {
        int16_t level;
        struct ff_envelope envelope;
};

/**
 * struct ff_ramp_effect - defines parameters of a ramp force-feedback effect
 * @start_level: beginning strength of the effect; may be negative
 * @end_level: final strength of the effect; may be negative
 * @envelope: envelope data
 */
struct ff_ramp_effect {
        int16_t start_level;
        int16_t end_level;
        struct ff_envelope envelope;
};

/**
 * struct ff_condition_effect - defines a spring or friction force-feedback effect
 * @right_saturation: maximum level when joystick moved all way to the right
 * @left_saturation: same for the left side
 * @right_coeff: controls how fast the force grows when the joystick moves
 *      to the right
 * @left_coeff: same for the left side
 * @deadband: size of the dead zone, where no force is produced
 * @center: position of the dead zone
 */
struct ff_condition_effect {
        uint16_t right_saturation;
        uint16_t left_saturation;

        int16_t right_coeff;
        int16_t left_coeff;

        uint16_t deadband;
        int16_t center;
};

/**
 * struct ff_periodic_effect - defines parameters of a periodic force-feedback effect
 * @waveform: kind of the effect (wave)
 * @period: period of the wave (ms)
 * @magnitude: peak value
 * @offset: mean value of the wave (roughly)
 * @phase: 'horizontal' shift
 * @envelope: envelope data
 * @custom_len: number of samples (FF_CUSTOM only)
 * @custom_data: buffer of samples (FF_CUSTOM only)
 *
 * Known waveforms - FF_SQUARE, FF_TRIANGLE, FF_SINE, FF_SAW_UP,
 * FF_SAW_DOWN, FF_CUSTOM. The exact syntax FF_CUSTOM is undefined
 * for the time being as no driver supports it yet.
 *
 * Note: the data pointed by custom_data is copied by the driver.
 * You can therefore dispose of the memory after the upload/update.
 */
struct ff_periodic_effect {
        uint16_t waveform;
        uint16_t period;
        int16_t magnitude;
        int16_t offset;
        uint16_t phase;

        struct ff_envelope envelope;

        uint32_t custom_len;
        int16_t *custom_data;
};

/**
 * struct ff_rumble_effect - defines parameters of a periodic force-feedback effect
 * @strong_magnitude: magnitude of the heavy motor
 * @weak_magnitude: magnitude of the light one
 *
 * Some rumble pads have two motors of different weight. Strong_magnitude
 * represents the magnitude of the vibration generated by the heavy one.
 */
struct ff_rumble_effect {
        uint16_t strong_magnitude;
        uint16_t weak_magnitude;
};

/**
 * struct ff_effect - defines force feedback effect
 * @type: type of the effect (FF_CONSTANT, FF_PERIODIC, FF_RAMP, FF_SPRING,
 *      FF_FRICTION, FF_DAMPER, FF_RUMBLE, FF_INERTIA, or FF_CUSTOM)
 * @id: an unique id assigned to an effect
 * @direction: direction of the effect
 * @trigger: trigger conditions (struct ff_trigger)
 * @replay: scheduling of the effect (struct ff_replay)
 * @u: effect-specific structure (one of ff_constant_effect, ff_ramp_effect,
 *      ff_periodic_effect, ff_condition_effect, ff_rumble_effect) further
 *      defining effect parameters
 *
 * This structure is sent through ioctl from the application to the driver.
 * To create a new effect application should set its @id to -1; the kernel
 * will return assigned @id which can later be used to update or delete
 * this effect.
 *
 * Direction of the effect is encoded as follows:
 *      0 deg -> 0x0000 (down)
 *      90 deg -> 0x4000 (left)
 *      180 deg -> 0x8000 (up)
 *      270 deg -> 0xC000 (right)
 */
struct ff_effect {
        uint16_t type;
        int16_t id;
        uint16_t direction;
        struct ff_trigger trigger;
        struct ff_replay replay;

        union {
                struct ff_constant_effect constant;
                struct ff_ramp_effect ramp;
                struct ff_periodic_effect periodic;
                struct ff_condition_effect condition[2]; /* One for each axis */
                struct ff_rumble_effect rumble;
        } u;
};

/*
 * Force feedback effect types
 */

#define FF_RUMBLE       0x50
#define FF_PERIODIC     0x51
#define FF_CONSTANT     0x52
#define FF_SPRING       0x53
#define FF_FRICTION     0x54
#define FF_DAMPER       0x55
#define FF_INERTIA      0x56
#define FF_RAMP         0x57

#define FF_EFFECT_MIN   FF_RUMBLE
#define FF_EFFECT_MAX   FF_RAMP

/*
 * Force feedback periodic effect types
 */

#define FF_SQUARE       0x58
#define FF_TRIANGLE     0x59
#define FF_SINE         0x5a
#define FF_SAW_UP       0x5b
#define FF_SAW_DOWN     0x5c
#define FF_CUSTOM       0x5d

#define FF_WAVEFORM_MIN FF_SQUARE
#define FF_WAVEFORM_MAX FF_CUSTOM

/*
 * Set ff device properties
 */

#define FF_GAIN         0x60
#define FF_AUTOCENTER   0x61

/*
 * ff->playback(effect_id = FF_GAIN) is the first effect_id to
 * cause a collision with another ff method, in this case ff->set_gain().
 * Therefore the greatest safe value for effect_id is FF_GAIN - 1,
 * and thus the total number of effects should never exceed FF_GAIN.
 */
#define FF_MAX_EFFECTS  FF_GAIN

#define FF_MAX          0x7f
#define FF_CNT          (FF_MAX+1)

#endif /* _INPUT_H */