windfarm_pm91.c

来自「linux 内核源代码」· C语言 代码 · 共 745 行 · 第 1/2 页

static void wf_smu_create_slots_fans(void)
{
	struct wf_pid_param param = {
		.interval	= 1,
		.history_len	= 8,
		.gd		= 0x00000000,
		.gp		= 0x00000000,
		.gr		= 0x00020000,
		.itarget	= 0x00000000
	};

	/* Alloc & initialize state */
	wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
					GFP_KERNEL);
	if (wf_smu_slots_fans == NULL) {
		printk(KERN_WARNING "windfarm: Memory allocation error"
		       " max fan speed\n");
		goto fail;
	}
       	wf_smu_slots_fans->ticks = 1;

	/* Fill PID params */
	param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
	param.min = fan_slots->ops->get_min(fan_slots);
	param.max = fan_slots->ops->get_max(fan_slots);
	wf_pid_init(&wf_smu_slots_fans->pid, &param);

	DBG("wf: Slots Fan control initialized.\n");
	DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
	    FIX32TOPRINT(param.itarget), param.min, param.max);
	return;

 fail:
	if (fan_slots)
		wf_control_set_max(fan_slots);
}

static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
{
	s32 new_setpoint, power;
	int rc;

	if (--st->ticks != 0) {
		if (wf_smu_readjust)
			goto readjust;
		return;
	}
	st->ticks = st->pid.param.interval;

	rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power);
	if (rc) {
		printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
		       rc);
		wf_smu_failure_state |= FAILURE_SENSOR;
		return;
	}

	DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
	    FIX32TOPRINT(power));

#if 0 /* Check what makes a good overtemp condition */
	if (power > (st->pid.param.itarget + 0x50000))
		wf_smu_failure_state |= FAILURE_OVERTEMP;
#endif

	new_setpoint = wf_pid_run(&st->pid, power);

	DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);

	if (st->setpoint == new_setpoint)
		return;
	st->setpoint = new_setpoint;
 readjust:
	if (fan_slots && wf_smu_failure_state == 0) {
		rc = fan_slots->ops->set_value(fan_slots, st->setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: Slots fan error %d\n",
			       rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
}


/*
 * ****** Setup / Init / Misc ... ******
 *
 */

static void wf_smu_tick(void)
{
	unsigned int last_failure = wf_smu_failure_state;
	unsigned int new_failure;

	if (!wf_smu_started) {
		DBG("wf: creating control loops !\n");
		wf_smu_create_drive_fans();
		wf_smu_create_slots_fans();
		wf_smu_create_cpu_fans();
		wf_smu_started = 1;
	}

	/* Skipping ticks */
	if (wf_smu_skipping && --wf_smu_skipping)
		return;

	wf_smu_failure_state = 0;
	if (wf_smu_drive_fans)
		wf_smu_drive_fans_tick(wf_smu_drive_fans);
	if (wf_smu_slots_fans)
		wf_smu_slots_fans_tick(wf_smu_slots_fans);
	if (wf_smu_cpu_fans)
		wf_smu_cpu_fans_tick(wf_smu_cpu_fans);

	wf_smu_readjust = 0;
	new_failure = wf_smu_failure_state & ~last_failure;

	/* If entering failure mode, clamp cpufreq and ramp all
	 * fans to full speed.
	 */
	if (wf_smu_failure_state && !last_failure) {
		if (cpufreq_clamp)
			wf_control_set_max(cpufreq_clamp);
		if (fan_cpu_main)
			wf_control_set_max(fan_cpu_main);
		if (fan_cpu_second)
			wf_control_set_max(fan_cpu_second);
		if (fan_cpu_third)
			wf_control_set_max(fan_cpu_third);
		if (fan_hd)
			wf_control_set_max(fan_hd);
		if (fan_slots)
			wf_control_set_max(fan_slots);
	}

	/* If leaving failure mode, unclamp cpufreq and readjust
	 * all fans on next iteration
	 */
	if (!wf_smu_failure_state && last_failure) {
		if (cpufreq_clamp)
			wf_control_set_min(cpufreq_clamp);
		wf_smu_readjust = 1;
	}

	/* Overtemp condition detected, notify and start skipping a couple
	 * ticks to let the temperature go down
	 */
	if (new_failure & FAILURE_OVERTEMP) {
		wf_set_overtemp();
		wf_smu_skipping = 2;
	}

	/* We only clear the overtemp condition if overtemp is cleared
	 * _and_ no other failure is present. Since a sensor error will
	 * clear the overtemp condition (can't measure temperature) at
	 * the control loop levels, but we don't want to keep it clear
	 * here in this case
	 */
	if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
		wf_clear_overtemp();
}


static void wf_smu_new_control(struct wf_control *ct)
{
	if (wf_smu_all_controls_ok)
		return;

	if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
		if (wf_get_control(ct) == 0)
			fan_cpu_main = ct;
	}

	if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
		if (wf_get_control(ct) == 0)
			fan_cpu_second = ct;
	}

	if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
		if (wf_get_control(ct) == 0)
			fan_cpu_third = ct;
	}

	if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
		if (wf_get_control(ct) == 0)
			cpufreq_clamp = ct;
	}

	if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
		if (wf_get_control(ct) == 0)
			fan_hd = ct;
	}

	if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
		if (wf_get_control(ct) == 0)
			fan_slots = ct;
	}

	if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
	    fan_slots && cpufreq_clamp)
		wf_smu_all_controls_ok = 1;
}

static void wf_smu_new_sensor(struct wf_sensor *sr)
{
	if (wf_smu_all_sensors_ok)
		return;

	if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
		if (wf_get_sensor(sr) == 0)
			sensor_cpu_power = sr;
	}

	if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
		if (wf_get_sensor(sr) == 0)
			sensor_cpu_temp = sr;
	}

	if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
		if (wf_get_sensor(sr) == 0)
			sensor_hd_temp = sr;
	}

	if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
		if (wf_get_sensor(sr) == 0)
			sensor_slots_power = sr;
	}

	if (sensor_cpu_power && sensor_cpu_temp &&
	    sensor_hd_temp && sensor_slots_power)
		wf_smu_all_sensors_ok = 1;
}


static int wf_smu_notify(struct notifier_block *self,
			       unsigned long event, void *data)
{
	switch(event) {
	case WF_EVENT_NEW_CONTROL:
		DBG("wf: new control %s detected\n",
		    ((struct wf_control *)data)->name);
		wf_smu_new_control(data);
		wf_smu_readjust = 1;
		break;
	case WF_EVENT_NEW_SENSOR:
		DBG("wf: new sensor %s detected\n",
		    ((struct wf_sensor *)data)->name);
		wf_smu_new_sensor(data);
		break;
	case WF_EVENT_TICK:
		if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
			wf_smu_tick();
	}

	return 0;
}

static struct notifier_block wf_smu_events = {
	.notifier_call	= wf_smu_notify,
};

static int wf_init_pm(void)
{
	printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");

	return 0;
}

static int wf_smu_probe(struct platform_device *ddev)
{
	wf_register_client(&wf_smu_events);

	return 0;
}

static int __devexit wf_smu_remove(struct platform_device *ddev)
{
	wf_unregister_client(&wf_smu_events);

	/* XXX We don't have yet a guarantee that our callback isn't
	 * in progress when returning from wf_unregister_client, so
	 * we add an arbitrary delay. I'll have to fix that in the core
	 */
	msleep(1000);

	/* Release all sensors */
	/* One more crappy race: I don't think we have any guarantee here
	 * that the attribute callback won't race with the sensor beeing
	 * disposed of, and I'm not 100% certain what best way to deal
	 * with that except by adding locks all over... I'll do that
	 * eventually but heh, who ever rmmod this module anyway ?
	 */
	if (sensor_cpu_power)
		wf_put_sensor(sensor_cpu_power);
	if (sensor_cpu_temp)
		wf_put_sensor(sensor_cpu_temp);
	if (sensor_hd_temp)
		wf_put_sensor(sensor_hd_temp);
	if (sensor_slots_power)
		wf_put_sensor(sensor_slots_power);

	/* Release all controls */
	if (fan_cpu_main)
		wf_put_control(fan_cpu_main);
	if (fan_cpu_second)
		wf_put_control(fan_cpu_second);
	if (fan_cpu_third)
		wf_put_control(fan_cpu_third);
	if (fan_hd)
		wf_put_control(fan_hd);
	if (fan_slots)
		wf_put_control(fan_slots);
	if (cpufreq_clamp)
		wf_put_control(cpufreq_clamp);

	/* Destroy control loops state structures */
	if (wf_smu_slots_fans)
		kfree(wf_smu_cpu_fans);
	if (wf_smu_drive_fans)
		kfree(wf_smu_cpu_fans);
	if (wf_smu_cpu_fans)
		kfree(wf_smu_cpu_fans);

	return 0;
}

static struct platform_driver wf_smu_driver = {
        .probe = wf_smu_probe,
        .remove = __devexit_p(wf_smu_remove),
	.driver = {
		.name = "windfarm",
		.bus = &platform_bus_type,
	},
};


static int __init wf_smu_init(void)
{
	int rc = -ENODEV;

	if (machine_is_compatible("PowerMac9,1"))
		rc = wf_init_pm();

	if (rc == 0) {
#ifdef MODULE
		request_module("windfarm_smu_controls");
		request_module("windfarm_smu_sensors");
		request_module("windfarm_lm75_sensor");
		request_module("windfarm_cpufreq_clamp");

#endif /* MODULE */
		platform_driver_register(&wf_smu_driver);
	}

	return rc;
}

static void __exit wf_smu_exit(void)
{

	platform_driver_unregister(&wf_smu_driver);
}


module_init(wf_smu_init);
module_exit(wf_smu_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt <[e-mail]>");
MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
MODULE_LICENSE("GPL");