iforce-ff.c

优龙2410linux2.6.8内核源代码

/*
 * 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* new)
{
	int id = new->id;
	struct ff_effect* old = &iforce->core_effects[id].effect;

	if (new->type != FF_PERIODIC) {
		printk(KERN_WARNING "iforce.c: bad effect type in need_periodic_modifier\n");
		return FALSE;
	}

	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 iforce* iforce, struct ff_effect* new)
{
	int id = new->id;
	struct ff_effect* old = &iforce->core_effects[id].effect;

	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 TRUE;

	return FALSE;
}
/*
 * 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, int is_update)
{
	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 (!is_update || need_period_modifier(iforce, effect)) {
		param1_err = make_period_modifier(iforce, mod1_chunk,
			is_update,
			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 (!is_update || need_envelope_modifier(iforce, effect)) {
		param2_err = make_envelope_modifier(iforce, mod2_chunk,
			is_update,
			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 (!is_update || need_core(iforce, 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, int is_update)
{
	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 (!is_update || need_magnitude_modifier(iforce, effect)) {
		param1_err = make_magnitude_modifier(iforce, mod1_chunk,
			is_update,
			effect->u.constant.level);
		if (param1_err) return param1_err;
		set_bit(FF_MOD1_IS_USED, core_effect->flags);
	}

	if (!is_update || need_envelope_modifier(iforce, effect)) {
		param2_err = make_envelope_modifier(iforce, mod2_chunk,
			is_update,
			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 (!is_update || need_core(iforce, 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, int is_update)
{
	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 (!is_update || need_condition_modifier(iforce, effect)) {
		param_err = make_condition_modifier(iforce, mod1_chunk,
			is_update,
			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,
			is_update,
			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 (!is_update || need_core(iforce, 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;
}