linux/drivers/input/joystick/iforce/iforce-ff.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 2000-2002 Vojtech Pavlik <[email protected]>
 *  Copyright (c) 2001-2002, 2007 Johann Deneux <[email protected]>
 *
 *  USB/RS232 I-Force joysticks and wheels.
 */

#include "iforce.h"

/*
 * Set the magnitude of a constant force effect
 * Return error code
 *
 * Note: caller must ensure exclusive access to device
 */

static int make_magnitude_modifier(struct iforce* iforce,
	struct resource* mod_chunk, int no_alloc, __s16 level)
{ … }

/*
 * Upload the component of an effect dealing with the period, phase and magnitude
 */

static int make_period_modifier(struct iforce* iforce,
	struct resource* mod_chunk, int no_alloc,
	__s16 magnitude, __s16 offset, u16 period, u16 phase)
{ … }

/*
 * Uploads the part of an effect setting the envelope of the force
 */

static int make_envelope_modifier(struct iforce* iforce,
	struct resource* mod_chunk, int no_alloc,
	u16 attack_duration, __s16 initial_level,
	u16 fade_duration, __s16 final_level)
{ … }

/*
 * Component of spring, friction, inertia... effects
 */

static int make_condition_modifier(struct iforce* iforce,
	struct resource* mod_chunk, int no_alloc,
	__u16 rsat, __u16 lsat, __s16 rk, __s16 lk, u16 db, __s16 center)
{ … }

static unsigned char find_button(struct iforce *iforce, signed short button)
{ … }

/*
 * Analyse the changes in an effect, and tell if we need to send an condition
 * parameter packet
 */
static int need_condition_modifier(struct iforce *iforce,
				   struct ff_effect *old,
				   struct ff_effect *new)
{ … }

/*
 * Analyse the changes in an effect, and tell if we need to send a magnitude
 * parameter packet
 */
static int need_magnitude_modifier(struct iforce *iforce,
				   struct ff_effect *old,
				   struct ff_effect *effect)
{ … }

/*
 * Analyse the changes in an effect, and tell if we need to send an envelope
 * parameter packet
 */
static int need_envelope_modifier(struct iforce *iforce, struct ff_effect *old,
				  struct ff_effect *effect)
{ … }

/*
 * Analyse the changes in an effect, and tell if we need to send a periodic
 * parameter effect
 */
static int need_period_modifier(struct iforce *iforce, struct ff_effect *old,
				struct ff_effect *new)
{ … }

/*
 * Analyse the changes in an effect, and tell if we need to send an effect
 * packet
 */
static int need_core(struct ff_effect *old, struct ff_effect *new)
{ … }
/*
 * Send the part common to all effects to the device
 */
static int make_core(struct iforce* iforce, u16 id, u16 mod_id1, u16 mod_id2,
	u8 effect_type, u8 axes, u16 duration, u16 delay, u16 button,
	u16 interval, u16 direction)
{ … }

/*
 * Upload a periodic effect to the device
 * See also iforce_upload_constant.
 */
int iforce_upload_periodic(struct iforce *iforce, struct ff_effect *effect, struct ff_effect *old)
{ … }

/*
 * Upload a constant force effect
 * Return value:
 *  <0 Error code
 *  0 Ok, effect created or updated
 *  1 effect did not change since last upload, and no packet was therefore sent
 */
int iforce_upload_constant(struct iforce *iforce, struct ff_effect *effect, struct ff_effect *old)
{ … }

/*
 * Upload an condition effect. Those are for example friction, inertia, springs...
 */
int iforce_upload_condition(struct iforce *iforce, struct ff_effect *effect, struct ff_effect *old)
{ … }