// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
 *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
 *
 *  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)
{
        unsigned char data[3];

        if (!no_alloc) {
                guard(mutex)(&iforce->mem_mutex);

                if (allocate_resource(&iforce->device_memory, mod_chunk, 2,
                                      iforce->device_memory.start,
                                      iforce->device_memory.end,
                                      2L, NULL, NULL))
                        return -ENOSPC;
        }

        data[0] = LO(mod_chunk->start);
        data[1] = HI(mod_chunk->start);
        data[2] = HIFIX80(level);

        iforce_send_packet(iforce, FF_CMD_MAGNITUDE, data);

        iforce_dump_packet(iforce, "magnitude", FF_CMD_MAGNITUDE, data);
        return 0;
}

/*
 * 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)
{
        unsigned char data[7];

        period = TIME_SCALE(period);

        if (!no_alloc) {
                guard(mutex)(&iforce->mem_mutex);

                if (allocate_resource(&iforce->device_memory, mod_chunk, 0x0c,
                                      iforce->device_memory.start,
                                      iforce->device_memory.end,
                                      2L, NULL, NULL))
                        return -ENOSPC;
        }

        data[0] = LO(mod_chunk->start);
        data[1] = HI(mod_chunk->start);

        data[2] = HIFIX80(magnitude);
        data[3] = HIFIX80(offset);
        data[4] = HI(phase);

        data[5] = LO(period);
        data[6] = HI(period);

        iforce_send_packet(iforce, FF_CMD_PERIOD, data);

        return 0;
}

/*
 * 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)
{
        unsigned char data[8];

        attack_duration = TIME_SCALE(attack_duration);
        fade_duration = TIME_SCALE(fade_duration);

        if (!no_alloc) {
                guard(mutex)(&iforce->mem_mutex);

                if (allocate_resource(&(iforce->device_memory), mod_chunk, 0x0e,
                                      iforce->device_memory.start,
                                      iforce->device_memory.end,
                                      2L, NULL, NULL))
                        return -ENOSPC;
        }

        data[0] = LO(mod_chunk->start);
        data[1] = HI(mod_chunk->start);

        data[2] = LO(attack_duration);
        data[3] = HI(attack_duration);
        data[4] = HI(initial_level);

        data[5] = LO(fade_duration);
        data[6] = HI(fade_duration);
        data[7] = HI(final_level);

        iforce_send_packet(iforce, FF_CMD_ENVELOPE, data);

        return 0;
}

/*
 * 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)
{
        unsigned char data[10];

        if (!no_alloc) {
                guard(mutex)(&iforce->mem_mutex);

                if (allocate_resource(&(iforce->device_memory), mod_chunk, 8,
                                      iforce->device_memory.start,
                                      iforce->device_memory.end,
                                      2L, NULL, NULL))
                        return -ENOSPC;
        }

        data[0] = LO(mod_chunk->start);
        data[1] = HI(mod_chunk->start);

        data[2] = (100 * rk) >> 15;     /* Dangerous: the sign is extended by gcc on plateforms providing an arith shift */
        data[3] = (100 * lk) >> 15; /* This code is incorrect on cpus lacking arith shift */

        center = (500 * center) >> 15;
        data[4] = LO(center);
        data[5] = HI(center);

        db = (1000 * db) >> 16;
        data[6] = LO(db);
        data[7] = HI(db);

        data[8] = (100 * rsat) >> 16;
        data[9] = (100 * lsat) >> 16;

        iforce_send_packet(iforce, FF_CMD_CONDITION, data);
        iforce_dump_packet(iforce, "condition", FF_CMD_CONDITION, data);

        return 0;
}

static unsigned char find_button(struct iforce *iforce, signed short button)
{
        int i;

        for (i = 1; iforce->type->btn[i] >= 0; i++)
                if (iforce->type->btn[i] == button)
                        return i + 1;
        return 0;
}

/*
 * 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)
{
        int ret = 0;
        int i;

        if (new->type != FF_SPRING && new->type != FF_FRICTION) {
                dev_warn(&iforce->dev->dev, "bad effect type in %s\n",
                         __func__);
                return 0;
        }

        for (i = 0; i < 2; i++) {
                ret |= old->u.condition[i].right_saturation != new->u.condition[i].right_saturation
                        || old->u.condition[i].left_saturation != new->u.condition[i].left_saturation
                        || old->u.condition[i].right_coeff != new->u.condition[i].right_coeff
                        || old->u.condition[i].left_coeff != new->u.condition[i].left_coeff
                        || old->u.condition[i].deadband != new->u.condition[i].deadband
                        || old->u.condition[i].center != new->u.condition[i].center;
        }
        return ret;
}

/*
 * 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)
{
        if (effect->type != FF_CONSTANT) {
                dev_warn(&iforce->dev->dev, "bad effect type in %s\n",
                         __func__);
                return 0;
        }

        return old->u.constant.level != effect->u.constant.level;
}

/*
 * 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)
{
        switch (effect->type) {
        case FF_CONSTANT:
                if (old->u.constant.envelope.attack_length != effect->u.constant.envelope.attack_length
                || old->u.constant.envelope.attack_level != effect->u.constant.envelope.attack_level
                || old->u.constant.envelope.fade_length != effect->u.constant.envelope.fade_length
                || old->u.constant.envelope.fade_level != effect->u.constant.envelope.fade_level)
                        return 1;
                break;

        case FF_PERIODIC:
                if (old->u.periodic.envelope.attack_length != effect->u.periodic.envelope.attack_length
                || old->u.periodic.envelope.attack_level != effect->u.periodic.envelope.attack_level
                || old->u.periodic.envelope.fade_length != effect->u.periodic.envelope.fade_length
                || old->u.periodic.envelope.fade_level != effect->u.periodic.envelope.fade_level)
                        return 1;
                break;

        default:
                dev_warn(&iforce->dev->dev, "bad effect type in %s\n",
                         __func__);
        }

        return 0;
}

/*
 * 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)
{
        if (new->type != FF_PERIODIC) {
                dev_warn(&iforce->dev->dev, "bad effect type in %s\n",
                         __func__);
                return 0;
        }
        return (old->u.periodic.period != new->u.periodic.period
                || old->u.periodic.magnitude != new->u.periodic.magnitude
                || old->u.periodic.offset != new->u.periodic.offset
                || old->u.periodic.phase != new->u.periodic.phase);
}

/*
 * 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)
{
        if (old->direction != new->direction
                || old->trigger.button != new->trigger.button
                || old->trigger.interval != new->trigger.interval
                || old->replay.length != new->replay.length
                || old->replay.delay != new->replay.delay)
                return 1;

        return 0;
}
/*
 * 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)
{
        unsigned char data[14];

        duration = TIME_SCALE(duration);
        delay    = TIME_SCALE(delay);
        interval = TIME_SCALE(interval);

        data[0]  = LO(id);
        data[1]  = effect_type;
        data[2]  = LO(axes) | find_button(iforce, button);

        data[3]  = LO(duration);
        data[4]  = HI(duration);

        data[5]  = HI(direction);

        data[6]  = LO(interval);
        data[7]  = HI(interval);

        data[8]  = LO(mod_id1);
        data[9]  = HI(mod_id1);
        data[10] = LO(mod_id2);
        data[11] = HI(mod_id2);

        data[12] = LO(delay);
        data[13] = HI(delay);

        /* Stop effect */
/*      iforce_control_playback(iforce, id, 0);*/

        iforce_send_packet(iforce, FF_CMD_EFFECT, data);

        /* If needed, restart effect */
        if (test_bit(FF_CORE_SHOULD_PLAY, iforce->core_effects[id].flags)) {
                /* BUG: perhaps we should replay n times, instead of 1. But we do not know n */
                iforce_control_playback(iforce, id, 1);
        }

        return 0;
}

/*
 * 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)
{
        u8 wave_code;
        int core_id = effect->id;
        struct iforce_core_effect* core_effect = iforce->core_effects + core_id;
        struct resource* mod1_chunk = &(iforce->core_effects[core_id].mod1_chunk);
        struct resource* mod2_chunk = &(iforce->core_effects[core_id].mod2_chunk);
        int param1_err = 1;
        int param2_err = 1;
        int core_err = 0;

        if (!old || need_period_modifier(iforce, old, effect)) {
                param1_err = make_period_modifier(iforce, mod1_chunk,
                        old != NULL,
                        effect->u.periodic.magnitude, effect->u.periodic.offset,
                        effect->u.periodic.period, effect->u.periodic.phase);
                if (param1_err)
                        return param1_err;
                set_bit(FF_MOD1_IS_USED, core_effect->flags);
        }

        if (!old || need_envelope_modifier(iforce, old, effect)) {
                param2_err = make_envelope_modifier(iforce, mod2_chunk,
                        old !=NULL,
                        effect->u.periodic.envelope.attack_length,
                        effect->u.periodic.envelope.attack_level,
                        effect->u.periodic.envelope.fade_length,
                        effect->u.periodic.envelope.fade_level);
                if (param2_err)
                        return param2_err;
                set_bit(FF_MOD2_IS_USED, core_effect->flags);
        }

        switch (effect->u.periodic.waveform) {
        case FF_SQUARE:         wave_code = 0x20; break;
        case FF_TRIANGLE:       wave_code = 0x21; break;
        case FF_SINE:           wave_code = 0x22; break;
        case FF_SAW_UP:         wave_code = 0x23; break;
        case FF_SAW_DOWN:       wave_code = 0x24; break;
        default:                wave_code = 0x20; break;
        }

        if (!old || need_core(old, effect)) {
                core_err = make_core(iforce, effect->id,
                        mod1_chunk->start,
                        mod2_chunk->start,
                        wave_code,
                        0x20,
                        effect->replay.length,
                        effect->replay.delay,
                        effect->trigger.button,
                        effect->trigger.interval,
                        effect->direction);
        }

        /* If one of the parameter creation failed, we already returned an
         * error code.
         * If the core creation failed, we return its error code.
         * Else: if one parameter at least was created, we return 0
         *       else we return 1;
         */
        return core_err < 0 ? core_err : (param1_err && param2_err);
}

/*
 * 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)
{
        int core_id = effect->id;
        struct iforce_core_effect* core_effect = iforce->core_effects + core_id;
        struct resource* mod1_chunk = &(iforce->core_effects[core_id].mod1_chunk);
        struct resource* mod2_chunk = &(iforce->core_effects[core_id].mod2_chunk);
        int param1_err = 1;
        int param2_err = 1;
        int core_err = 0;

        if (!old || need_magnitude_modifier(iforce, old, effect)) {
                param1_err = make_magnitude_modifier(iforce, mod1_chunk,
                        old != NULL,
                        effect->u.constant.level);
                if (param1_err)
                        return param1_err;
                set_bit(FF_MOD1_IS_USED, core_effect->flags);
        }

        if (!old || need_envelope_modifier(iforce, old, effect)) {
                param2_err = make_envelope_modifier(iforce, mod2_chunk,
                        old != NULL,
                        effect->u.constant.envelope.attack_length,
                        effect->u.constant.envelope.attack_level,
                        effect->u.constant.envelope.fade_length,
                        effect->u.constant.envelope.fade_level);
                if (param2_err)
                        return param2_err;
                set_bit(FF_MOD2_IS_USED, core_effect->flags);
        }

        if (!old || need_core(old, effect)) {
                core_err = make_core(iforce, effect->id,
                        mod1_chunk->start,
                        mod2_chunk->start,
                        0x00,
                        0x20,
                        effect->replay.length,
                        effect->replay.delay,
                        effect->trigger.button,
                        effect->trigger.interval,
                        effect->direction);
        }

        /* If one of the parameter creation failed, we already returned an
         * error code.
         * If the core creation failed, we return its error code.
         * Else: if one parameter at least was created, we return 0
         *       else we return 1;
         */
        return core_err < 0 ? core_err : (param1_err && param2_err);
}

/*
 * 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)
{
        int core_id = effect->id;
        struct iforce_core_effect* core_effect = iforce->core_effects + core_id;
        struct resource* mod1_chunk = &(core_effect->mod1_chunk);
        struct resource* mod2_chunk = &(core_effect->mod2_chunk);
        u8 type;
        int param_err = 1;
        int core_err = 0;

        switch (effect->type) {
        case FF_SPRING: type = 0x40; break;
        case FF_DAMPER: type = 0x41; break;
        default: return -1;
        }

        if (!old || need_condition_modifier(iforce, old, effect)) {
                param_err = make_condition_modifier(iforce, mod1_chunk,
                        old != NULL,
                        effect->u.condition[0].right_saturation,
                        effect->u.condition[0].left_saturation,
                        effect->u.condition[0].right_coeff,
                        effect->u.condition[0].left_coeff,
                        effect->u.condition[0].deadband,
                        effect->u.condition[0].center);
                if (param_err)
                        return param_err;
                set_bit(FF_MOD1_IS_USED, core_effect->flags);

                param_err = make_condition_modifier(iforce, mod2_chunk,
                        old != NULL,
                        effect->u.condition[1].right_saturation,
                        effect->u.condition[1].left_saturation,
                        effect->u.condition[1].right_coeff,
                        effect->u.condition[1].left_coeff,
                        effect->u.condition[1].deadband,
                        effect->u.condition[1].center);
                if (param_err)
                        return param_err;
                set_bit(FF_MOD2_IS_USED, core_effect->flags);

        }

        if (!old || need_core(old, effect)) {
                core_err = make_core(iforce, effect->id,
                        mod1_chunk->start, mod2_chunk->start,
                        type, 0xc0,
                        effect->replay.length, effect->replay.delay,
                        effect->trigger.button, effect->trigger.interval,
                        effect->direction);
        }

        /* If the parameter creation failed, we already returned an
         * error code.
         * If the core creation failed, we return its error code.
         * Else: if a parameter  was created, we return 0
         *       else we return 1;
         */
        return core_err < 0 ? core_err : param_err;
}