windfarm_pm81.c

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	}
	piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];

	/* Get the FVT params for operating point 0 (the only supported one
	 * for now) in order to get tmax
	 */
	hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
	if (hdr) {
		fvt = (struct smu_sdbp_fvt *)&hdr[1];
		tmax = ((s32)fvt->maxtemp) << 16;
	} else
		tmax = 0x5e0000; /* 94 degree default */

	/* Alloc & initialize state */
	wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
				  GFP_KERNEL);
	if (wf_smu_cpu_fans == NULL)
		goto fail;
       	wf_smu_cpu_fans->ticks = 1;

	wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
	wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;

	/* Fill PID params */
	pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
	pid_param.history_len = piddata->history_len;
	if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
		printk(KERN_WARNING "windfarm: History size overflow on "
		       "CPU control loop (%d)\n", piddata->history_len);
		pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
	}
	pid_param.gd = piddata->gd;
	pid_param.gp = piddata->gp;
	pid_param.gr = piddata->gr / pid_param.history_len;

	tdelta = ((s32)piddata->target_temp_delta) << 16;
	maxpow = ((s32)piddata->max_power) << 16;
	powadj = ((s32)piddata->power_adj) << 16;

	pid_param.tmax = tmax;
	pid_param.ttarget = tmax - tdelta;
	pid_param.pmaxadj = maxpow - powadj;

	pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
	pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);

	wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);

	DBG("wf: CPU Fan control initialized.\n");
	DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
	    FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
	    pid_param.min, pid_param.max);

	return;

 fail:
	printk(KERN_WARNING "windfarm: CPU fan config not found\n"
	       "for this machine model, max fan speed\n");

	if (cpufreq_clamp)
		wf_control_set_max(cpufreq_clamp);
	if (fan_cpu_main)
		wf_control_set_max(fan_cpu_main);
}

static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
{
	s32 new_setpoint, temp, power, systarget;
	int rc;

	if (--st->ticks != 0) {
		if (wf_smu_readjust)
			goto readjust;
		return;
	}
	st->ticks = WF_SMU_CPU_FANS_INTERVAL;

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

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

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

#ifdef HACKED_OVERTEMP
	if (temp > 0x4a0000)
		wf_smu_failure_state |= FAILURE_OVERTEMP;
#else
	if (temp > st->pid.param.tmax)
		wf_smu_failure_state |= FAILURE_OVERTEMP;
#endif
	new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);

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

	systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
	systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
		+ st->offset;
	new_setpoint = max(new_setpoint, systarget);
	new_setpoint = max(new_setpoint, st->pid.param.min);
	new_setpoint = min(new_setpoint, st->pid.param.max);

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

	if (st->cpu_setpoint == new_setpoint)
		return;
	st->cpu_setpoint = new_setpoint;
 readjust:
	if (fan_cpu_main && wf_smu_failure_state == 0) {
		rc = fan_cpu_main->ops->set_value(fan_cpu_main,
						  st->cpu_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: CPU main 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_sys_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_sys_fans)
		wf_smu_sys_fans_tick(wf_smu_sys_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_system)
			wf_control_set_max(fan_system);
		if (fan_cpu_main)
			wf_control_set_max(fan_cpu_main);
		if (fan_hd)
			wf_control_set_max(fan_hd);
	}

	/* 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-fan")) {
		if (wf_get_control(ct) == 0)
			fan_cpu_main = ct;
	}

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

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

	/* Darwin property list says the HD fan is only for model ID
	 * 0, 1, 2 and 3
	 */

	if (wf_smu_mach_model > 3) {
		if (fan_system && fan_cpu_main && cpufreq_clamp)
			wf_smu_all_controls_ok = 1;
		return;
	}

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

	if (fan_system && fan_hd && fan_cpu_main && 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_cpu_power && sensor_cpu_temp && sensor_hd_temp)
		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)
{
	const struct smu_sdbp_header *hdr;

	hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
	if (hdr != 0) {
		struct smu_sdbp_sensortree *st =
			(struct smu_sdbp_sensortree *)&hdr[1];
		wf_smu_mach_model = st->model_id;
	}

	printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
	       wf_smu_mach_model);

	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);

	/* Release all controls */
	if (fan_cpu_main)
		wf_put_control(fan_cpu_main);
	if (fan_hd)
		wf_put_control(fan_hd);
	if (fan_system)
		wf_put_control(fan_system);
	if (cpufreq_clamp)
		wf_put_control(cpufreq_clamp);

	/* Destroy control loops state structures */
	if (wf_smu_sys_fans)
		kfree(wf_smu_sys_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("PowerMac8,1") ||
	    machine_is_compatible("PowerMac8,2"))
		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 iMac G5");
MODULE_LICENSE("GPL");