galago/os/linux/input_linux.go

package linux

import "unsafe"


// This file is a Go version of <linux/input.h>
// The naming doesn't follow normal Go naming conventions,
// but maps to the C API, with the first word completely upper cased
// so it is exported. 

type INPUT_event struct {
	Timeval    Timeval
	Type        uint16
	Code        uint16
	Value       int32
}

/*
 * Protocol version.
 */

const EV_VERSION=0x010001

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

type INPUT_id struct {
	Bustype uint16
	Vendor uint16
	Product uint16
    Version uint16
}

/**
 * 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.
 *
 * 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.
 */
type INPUT_absinfo struct {
	Value int32;
	Minimum int32;
	Maximum int32;
	Fuzz int32;
	Flat int32;
	Resolution int32;
}

const INPUT_KEYMAP_BYINDEX	= (1 << 0)


/**
 * 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_BYINDEX 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).
 */
type INPUT_keymap_entry struct {
	Flags uint8;
	Len uint8;
	Index uint16;
	Keycode uint32;
	Scancode [32]uint8;
};

type INPUT_mask struct {
	Type uint32;
	Codes_size uint32;
	Codes_ptr uint32;
};


type uint32p = [2]uint32
const sizeof_uint32p = unsafe.Sizeof(*((*uint32p)(nil)))
const sizeof_int32 = unsafe.Sizeof(*((*int32)(nil)))
const sizeof_uint32 = unsafe.Sizeof(*((*uint32)(nil)))
const sizeof_INPUT_id = unsafe.Sizeof(*((*INPUT_id)(nil)))
const sizeof_INPUT_keymap_entry = unsafe.Sizeof(*((*INPUT_keymap_entry)(nil)))
const sizeof_INPUT_absinfo = unsafe.Sizeof(*((*INPUT_absinfo)(nil)))
const sizeof_INPUT_mask = unsafe.Sizeof(*((*INPUT_mask)(nil)))
const sizeof_FF_effect = unsafe.Sizeof(*((*FF_effect)(nil)))



var EVIOCGVERSION =	IOR('E', 0x01, sizeof_int32)		/* get driver version */
var EVIOCGID	  = IOR('E', 0x02, sizeof_INPUT_id)	/* get device ID */
var EVIOCGREP	  = IOR('E', 0x03, sizeof_uint32p)	/* get repeat settings */
var EVIOCSREP	  = IOW('E', 0x03, sizeof_uint32p)	/* set repeat settings */

var EVIOCGKEYCODE	= IOR('E', 0x04, sizeof_uint32)        /* get keycode */
var EVIOCGKEYCODE_V2= IOR('E', 0x04, sizeof_INPUT_keymap_entry)
var EVIOCSKEYCODE	= IOW('E', 0x04, sizeof_uint32p)        /* set keycode */
var EVIOCSKEYCODE_V2= IOW('E', 0x04, sizeof_INPUT_keymap_entry)

func EVIOCGNAME(len uintptr) uint32{	
    return IOC(IOC_READ, 'E', 0x06, len)		/* get device name */
}

func EVIOCGPHYS(len uintptr) uint32	{
    return IOC(IOC_READ, 'E', 0x07, len)		/* get physical location */
}

func EVIOCGUNIQ(len uintptr) uint32	{	
    return IOC(IOC_READ, 'E', 0x08, len)		/* get unique identifier */
}

func EVIOCGPROP(len uintptr) uint32 { 
    return IOC(IOC_READ, 'E', 0x09, len)		/* get device properties */
}

/**
 * EVIOCGMTSLOTS(len uintptr) uint32 { - get MT slot values
 * @len: size of the data buffer in bytes
 *
 * The ioctl buffer argument should be binary equivalent to
 *
 * type INPUT_mt_request_layout struct {
 *	__u32 code;
 *	__s32 values[num_slots];
 * };
 *
 * where num_slots is the (arbitrary) number of MT slots to extract.
 *
 * The ioctl size argument (len uintptr) uint32 { is the size of the buffer, which
 * should satisfy len = (num_slots + 1) * sizeof(__s32).  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.
 */
func EVIOCGMTSLOTS(len uintptr) uint32 {
    return IOC(IOC_READ, 'E', 0x0a, len)
}

func EVIOCGKEY(len uintptr) uint32 {		
    return IOC(IOC_READ, 'E', 0x18, len)		/* get global key state */
}

func EVIOCGLED(len uintptr) uint32 {		
    return IOC(IOC_READ, 'E', 0x19, len)		/* get all LEDs */
}

func EVIOCGSND(len uintptr) uint32 {		
    return IOC(IOC_READ, 'E', 0x1a, len)		/* get all sounds status */
}

func EVIOCGSW(len uintptr) uint32 {		
    return IOC(IOC_READ, 'E', 0x1b, len)		/* get all switch states */
}

func EVIOCGBIT(ev uint32, len uintptr) uint32 {	
    return IOC(IOC_READ, 'E', 0x20 + (ev), len)	/* get event bits */
}

func EVIOCGABS(abs uint32) uint32 { 
    return IOR('E', 0x40 + (abs), sizeof_INPUT_absinfo)	/* get abs value/limits */
}

func EVIOCSABS(abs uint32) uint32 {	
    return IOW('E', 0xc0 + (abs), sizeof_INPUT_absinfo)	/* set abs value/limits */
}

var EVIOCSFF = IOW('E', 0x80, sizeof_FF_effect)	/* send a force effect to a force feedback device */
var EVIOCRMFF = IOW('E', 0x81, sizeof_int32)			/* Erase a force effect */
var EVIOCGEFFECTS = IOR('E', 0x84, sizeof_int32)		/* Report number of effects playable at the same time */

var EVIOCGRAB = IOW('E', 0x90, sizeof_int32)			/* Grab/Release device */
var EVIOCREVOKE = IOW('E', 0x91, sizeof_int32)			/* 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.
 */
var EVIOCGMASK = IOR('E', 0x92, sizeof_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.
 */
var EVIOCSMASK = IOW('E', 0x93, sizeof_INPUT_mask)	/* Set event-masks */

var EVIOCSCLOCKID = IOW('E', 0xa0, sizeof_int32) /* Set clockid to be used for timestamps */

/*
 * IDs.
 */

const ID_BUS = 0
const ID_VENDOR = 1
const ID_PRODUCT = 2
const ID_VERSION = 3

const BUS_PCI = 0x01
const BUSISAPNP = 0x02
const BUS_USB = 0x03
const BUS_HIL = 0x04
const BUS_BLUETOOTH = 0x05
const BUS_VIRTUAL = 0x06

const BUSISA = 0x10
const BUSI8042 = 0x11
const BUS_XTKBD = 0x12
const BUS_RS232 = 0x13
const BUS_GAMEPORT = 0x14
const BUS_PARPORT = 0x15
const BUS_AMIGA = 0x16
const BUS_ADB = 0x17
const BUSI2C = 0x18
const BUS_HOST = 0x19
const BUS_GSC = 0x1A
const BUS_ATARI = 0x1B
const BUS_SPI = 0x1C

/*
 * MT_TOOL types
 */
const MT_TOOL_FINGER = 0
const MT_TOOL_PEN = 1
const MT_TOOL_PALM = 2
const MT_TOOL_MAX = 2

/*
 * Values describing the status of a force-feedback effect
 */
const FF_STATUS_STOPPED = 0x00
const FF_STATUS_PLAYING = 0x01
const 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
 */
type FF_replay struct {
	Length uint16
	Delay uint16
};

/**
 * 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
 */
type FF_trigger struct {
	Button uint16
	Interval uint16
};

/**
 * 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
 */
type FF_envelope struct {
	Attack_length uint16
	Attack_level uint16
	Fade_length uint16
	Fade_level uint16
};

/**
 * struct FF_constant_effect - defines parameters of a constant force-feedback effect
 * @level: strength of the effect; may be negative
 * @envelope: envelope data
 */
type FF_constant_effect struct {
	Level int16
	Envelope FF_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
 */
type FF_ramp_effect struct {
	Start_level int16
	End_level int16
	Envelope FF_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
 */
type FF_condition_effect struct {
	Right_saturation uint16
	Left_saturation uint16

	Right_coeff int16
	Left_coeff int16

	Deadband uint16
	Center int16
};

/**
 * 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.
 */
type FF_periodic_effect struct {
	Waveform uint16
	Period uint16
	Magnitude int16
	Offset int16
	Phase uint16

	Envelope FF_envelope

	Custom_len uint32
	Custom_data *int16;
};

/**
 * 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.
 */
type FF_rumble_effect struct {
	Strong_magnitude uint16
	Weak_magnitude uint16
};

const FF_effect_union_size = unsafe.Sizeof(*((*FF_periodic_effect)(nil)))

/**
 * 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, FFINERTIA, 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)
 */
type FF_effect struct {
	Type_ uint16
	Id int16
	Direction uint16
	Trigger FF_trigger
	Replay FF_replay
    // This was a union in C, somulate with a byte buffer with size of largest element
    U [FF_effect_union_size]byte
};

type FF_effect_u_constant struct {
	Type_ uint16
	Id int16
	Direction uint16
	Trigger FF_trigger
	Replay FF_replay
    Constant FF_constant_effect
};


type FF_effect_u_ramp struct {
	Type_ uint16
	Id int16
	Direction uint16
	Trigger FF_trigger
	Replay FF_replay
	Ramp FF_ramp_effect
};


type FF_effect_u_periodic struct {
	Type_ uint16
	Id int16
	Direction uint16
	Trigger FF_trigger
	Replay FF_replay
    Periodic FF_periodic_effect
};

type FF_effect_u_condition struct {
	Type_ uint16
	Id int16
	Direction uint16
	Trigger FF_trigger
	Replay FF_replay
    Condition [2]FF_condition_effect; /* One for each axis */
};

type FF_effect_u_rumble struct {
	Type_ uint16
	Id int16
	Direction uint16
	Trigger FF_trigger
	Replay FF_replay
    Rumble FF_rumble_effect
};


/*
 * Force feedback effect types
 */

const FF_RUMBLE = 0x50
const FF_PERIODIC = 0x51
const FF_CONSTANT = 0x52
const FF_SPRING = 0x53
const FF_FRICTION = 0x54
const FF_DAMPER = 0x55
const FFINERTIA = 0x56
const FF_RAMP = 0x57

const FF_EFFECT_MIN = FF_RUMBLE
const FF_EFFECT_MAX = FF_RAMP

/*
 * Force feedback periodic effect types
 */

const FF_SQUARE = 0x58
const FF_TRIANGLE = 0x59
const FF_SINE = 0x5a
const FF_SAW_UP = 0x5b
const FF_SAW_DOWN = 0x5c
const FF_CUSTOM = 0x5d

const FF_WAVEFORM_MIN = FF_SQUARE
const FF_WAVEFORM_MAX = FF_CUSTOM

/*
 * Set ff device properties
 */

const FF_GAIN = 0x60
const 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.
 */
const FF_MAX_EFFECTS = FF_GAIN

const FF_MAX = 0x7f
const FF_CNT = (FF_MAX+1)