[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / macintosh / windfarm_pm91.c

/*
 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 *
 * Released under the term of the GNU GPL v2.
 *
 * The algorithm used is the PID control algorithm, used the same
 * way the published Darwin code does, using the same values that
 * are present in the Darwin 8.2 snapshot property lists (note however
 * that none of the code has been re-used, it's a complete re-implementation
 *
 * The various control loops found in Darwin config file are:
 *
 * PowerMac9,1
 * ===========
 *
 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
 * try to play with other control loops fans). Drive bay is rather basic PID
 * with one sensor and one fan. Slots area is a bit different as the Darwin
 * driver is supposed to be capable of working in a special "AGP" mode which
 * involves the presence of an AGP sensor and an AGP fan (possibly on the
 * AGP card itself). I can't deal with that special mode as I don't have
 * access to those additional sensor/fans for now (though ultimately, it would
 * be possible to add sensor objects for them) so I'm only implementing the
 * basic PCI slot control loop
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/kmod.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/smu.h>

#include "windfarm.h"
#include "windfarm_pid.h"

#define VERSION "0.4"

#undef DEBUG

#ifdef DEBUG
#define DBG(args...)	printk(args)
#else
#define DBG(args...)	do { } while(0)
#endif

/* define this to force CPU overtemp to 74 degree, useful for testing
 * the overtemp code
 */
#undef HACKED_OVERTEMP

/* Controls & sensors */
static struct wf_sensor	*sensor_cpu_power;
static struct wf_sensor	*sensor_cpu_temp;
static struct wf_sensor	*sensor_hd_temp;
static struct wf_sensor	*sensor_slots_power;
static struct wf_control *fan_cpu_main;
static struct wf_control *fan_cpu_second;
static struct wf_control *fan_cpu_third;
static struct wf_control *fan_hd;
static struct wf_control *fan_slots;
static struct wf_control *cpufreq_clamp;

/* Set to kick the control loop into life */
static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;

/* Failure handling.. could be nicer */
#define FAILURE_FAN		0x01
#define FAILURE_SENSOR		0x02
#define FAILURE_OVERTEMP	0x04

static unsigned int wf_smu_failure_state;
static int wf_smu_readjust, wf_smu_skipping;

/*
 * ****** CPU Fans Control Loop ******
 *
 */


#define WF_SMU_CPU_FANS_INTERVAL	1
#define WF_SMU_CPU_FANS_MAX_HISTORY	16

/* State data used by the cpu fans control loop
 */
struct wf_smu_cpu_fans_state {
	int			ticks;
	s32			cpu_setpoint;
	struct wf_cpu_pid_state	pid;
};

static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;


/*
 * ****** Drive Fan Control Loop ******
 *
 */

struct wf_smu_drive_fans_state {
	int			ticks;
	s32			setpoint;
	struct wf_pid_state	pid;
};

static struct wf_smu_drive_fans_state *wf_smu_drive_fans;

/*
 * ****** Slots Fan Control Loop ******
 *
 */

struct wf_smu_slots_fans_state {
	int			ticks;
	s32			setpoint;
	struct wf_pid_state	pid;
};

static struct wf_smu_slots_fans_state *wf_smu_slots_fans;

/*
 * ***** Implementation *****
 *
 */


static void wf_smu_create_cpu_fans(void)
{
	struct wf_cpu_pid_param pid_param;
	const struct smu_sdbp_header *hdr;
	struct smu_sdbp_cpupiddata *piddata;
	struct smu_sdbp_fvt *fvt;
	s32 tmax, tdelta, maxpow, powadj;

	/* First, locate the PID params in SMU SBD */
	hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
	if (hdr == 0) {
		printk(KERN_WARNING "windfarm: CPU PID fan config not found "
		       "max fan speed\n");
		goto fail;
	}
	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;

	/* 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 = wf_control_get_min(fan_cpu_main);
	pid_param.max = wf_control_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;
	int rc;

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

	rc = wf_sensor_get(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 = wf_sensor_get(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);

	if (st->cpu_setpoint == new_setpoint)
		return;
	st->cpu_setpoint = new_setpoint;
 readjust:
	if (fan_cpu_main && wf_smu_failure_state == 0) {
		rc = wf_control_set(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;
		}
	}
	if (fan_cpu_second && wf_smu_failure_state == 0) {
		rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: CPU second fan"
			       " error %d\n", rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
	if (fan_cpu_third && wf_smu_failure_state == 0) {
		rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
		if (rc) {
			printk(KERN_WARNING "windfarm: CPU third fan"
			       " error %d\n", rc);
			wf_smu_failure_state |= FAILURE_FAN;
		}
	}
}

static void wf_smu_create_drive_fans(void)
{
	struct wf_pid_param param = {
		.interval	= 5,
		.history_len	= 2,
		.gd		= 0x01e00000,
		.gp		= 0x00500000,
		.gr		= 0x00000000,
		.itarget	= 0x00200000,
	};

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

	/* Fill PID params */
	param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
	param.min = wf_control_get_min(fan_hd);
	param.max = wf_control_get_max(fan_hd);
	wf_pid_init(&wf_smu_drive_fans->pid, &param);

	DBG("wf: Drive 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_hd)
		wf_control_set_max(fan_hd);
}

static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
{
	s32 new_setpoint, temp;
	int rc;

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

	rc = wf_sensor_get(sensor_hd_temp, &temp);
	if (rc) {
		printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
		       rc);
		wf_smu_failure_state |= FAILURE_SENSOR;
		return;
	}

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

	if (temp > (st->pid.param.itarget + 0x50000))
		wf_smu_failure_state |= FAILURE_OVERTEMP;

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

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

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

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 = wf_control_get_min(fan_slots);
	param.max = wf_control_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 = wf_sensor_get(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 = wf_control_set(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 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 */
	kfree(wf_smu_slots_fans);
	kfree(wf_smu_drive_fans);
	kfree(wf_smu_cpu_fans);

	return 0;
}

static struct platform_driver wf_smu_driver = {
        .probe = wf_smu_probe,
        .remove = wf_smu_remove,
	.driver = {
		.name = "windfarm",
		.owner	= THIS_MODULE,
	},
};


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

	if (of_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 <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:windfarm");
Commit	Line	Data
75722d39 BH	1	/*
	2	* Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
	3	*
	4	* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
	5	* <benh@kernel.crashing.org>
	6	*
	7	* Released under the term of the GNU GPL v2.
	8	*
	9	* The algorithm used is the PID control algorithm, used the same
	10	* way the published Darwin code does, using the same values that
	11	* are present in the Darwin 8.2 snapshot property lists (note however
	12	* that none of the code has been re-used, it's a complete re-implementation
	13	*
	14	* The various control loops found in Darwin config file are:
	15	*
	16	* PowerMac9,1
	17	* ===========
	18	*
	19	* Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
	20	* try to play with other control loops fans). Drive bay is rather basic PID
	21	* with one sensor and one fan. Slots area is a bit different as the Darwin
	22	* driver is supposed to be capable of working in a special "AGP" mode which
	23	* involves the presence of an AGP sensor and an AGP fan (possibly on the
	24	* AGP card itself). I can't deal with that special mode as I don't have
	25	* access to those additional sensor/fans for now (though ultimately, it would
	26	* be possible to add sensor objects for them) so I'm only implementing the
	27	* basic PCI slot control loop
	28	*/
	29
	30	#include <linux/types.h>
	31	#include <linux/errno.h>
	32	#include <linux/kernel.h>
	33	#include <linux/delay.h>
	34	#include <linux/slab.h>
	35	#include <linux/init.h>
	36	#include <linux/spinlock.h>
	37	#include <linux/wait.h>
	38	#include <linux/kmod.h>
	39	#include <linux/device.h>
	40	#include <linux/platform_device.h>
	41	#include <asm/prom.h>
	42	#include <asm/machdep.h>
	43	#include <asm/io.h>
75722d39 BH	44	#include <asm/sections.h>
	45	#include <asm/smu.h>
	46
	47	#include "windfarm.h"
	48	#include "windfarm_pid.h"
	49
	50	#define VERSION "0.4"
	51
	52	#undef DEBUG
	53
	54	#ifdef DEBUG
	55	#define DBG(args...) printk(args)
	56	#else
	57	#define DBG(args...) do { } while(0)
	58	#endif
	59
	60	/* define this to force CPU overtemp to 74 degree, useful for testing
	61	* the overtemp code
	62	*/
	63	#undef HACKED_OVERTEMP
	64
75722d39 BH	65	/* Controls & sensors */
	66	static struct wf_sensor *sensor_cpu_power;
	67	static struct wf_sensor *sensor_cpu_temp;
	68	static struct wf_sensor *sensor_hd_temp;
	69	static struct wf_sensor *sensor_slots_power;
	70	static struct wf_control *fan_cpu_main;
	71	static struct wf_control *fan_cpu_second;
	72	static struct wf_control *fan_cpu_third;
	73	static struct wf_control *fan_hd;
	74	static struct wf_control *fan_slots;
	75	static struct wf_control *cpufreq_clamp;
	76
	77	/* Set to kick the control loop into life */
	78	static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
	79
	80	/* Failure handling.. could be nicer */
	81	#define FAILURE_FAN 0x01
	82	#define FAILURE_SENSOR 0x02
	83	#define FAILURE_OVERTEMP 0x04
	84
	85	static unsigned int wf_smu_failure_state;
	86	static int wf_smu_readjust, wf_smu_skipping;
	87
	88	/*
	89	* **** CPU Fans Control Loop ****
	90	*
	91	*/
	92
	93
	94	#define WF_SMU_CPU_FANS_INTERVAL 1
	95	#define WF_SMU_CPU_FANS_MAX_HISTORY 16
	96
	97	/* State data used by the cpu fans control loop
	98	*/
	99	struct wf_smu_cpu_fans_state {
	100	int ticks;
	101	s32 cpu_setpoint;
	102	struct wf_cpu_pid_state pid;
	103	};
	104
	105	static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
	106
	107
	108
	109	/*
	110	* **** Drive Fan Control Loop ****
	111	*
	112	*/
	113
	114	struct wf_smu_drive_fans_state {
	115	int ticks;
	116	s32 setpoint;
	117	struct wf_pid_state pid;
	118	};
	119
	120	static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
	121
	122	/*
	123	* **** Slots Fan Control Loop ****
	124	*
	125	*/
	126
	127	struct wf_smu_slots_fans_state {
	128	int ticks;
129	s32 setpoint;
130	struct wf_pid_state pid;
131	};
132
133	static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
134
135	/*
136	* *** Implementation ***
137	*
138	*/
139
140
141	static void wf_smu_create_cpu_fans(void)
142	{
143	struct wf_cpu_pid_param pid_param;
018a3d1d	144	const struct smu_sdbp_header *hdr;
75722d39 BH	145	struct smu_sdbp_cpupiddata *piddata;
	146	struct smu_sdbp_fvt *fvt;
	147	s32 tmax, tdelta, maxpow, powadj;
	148
	149	/* First, locate the PID params in SMU SBD */
	150	hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
	151	if (hdr == 0) {
	152	printk(KERN_WARNING "windfarm: CPU PID fan config not found "
	153	"max fan speed\n");
	154	goto fail;
	155	}
	156	piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
	157
	158	/* Get the FVT params for operating point 0 (the only supported one
	159	* for now) in order to get tmax
	160	*/
	161	hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
	162	if (hdr) {
	163	fvt = (struct smu_sdbp_fvt *)&hdr[1];
	164	tmax = ((s32)fvt->maxtemp) << 16;
	165	} else
	166	tmax = 0x5e0000; /* 94 degree default */
	167
	168	/* Alloc & initialize state */
	169	wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
	170	GFP_KERNEL);
	171	if (wf_smu_cpu_fans == NULL)
	172	goto fail;
	173	wf_smu_cpu_fans->ticks = 1;
	174
	175	/* Fill PID params */
	176	pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
	177	pid_param.history_len = piddata->history_len;
	178	if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
	179	printk(KERN_WARNING "windfarm: History size overflow on "
	180	"CPU control loop (%d)\n", piddata->history_len);
	181	pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
	182	}
	183	pid_param.gd = piddata->gd;
	184	pid_param.gp = piddata->gp;
	185	pid_param.gr = piddata->gr / pid_param.history_len;
	186
	187	tdelta = ((s32)piddata->target_temp_delta) << 16;
	188	maxpow = ((s32)piddata->max_power) << 16;
	189	powadj = ((s32)piddata->power_adj) << 16;
	190
	191	pid_param.tmax = tmax;
	192	pid_param.ttarget = tmax - tdelta;
	193	pid_param.pmaxadj = maxpow - powadj;
	194
33e6820b BH	195	pid_param.min = wf_control_get_min(fan_cpu_main);
33e6820b BH	196	pid_param.max = wf_control_get_max(fan_cpu_main);
75722d39 BH	197
	198	wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
	199
	200	DBG("wf: CPU Fan control initialized.\n");
	201	DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
	202	FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
	203	pid_param.min, pid_param.max);
	204
	205	return;
	206
	207	fail:
	208	printk(KERN_WARNING "windfarm: CPU fan config not found\n"
	209	"for this machine model, max fan speed\n");
	210
	211	if (cpufreq_clamp)
	212	wf_control_set_max(cpufreq_clamp);
	213	if (fan_cpu_main)
	214	wf_control_set_max(fan_cpu_main);
	215	}
	216
	217	static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
	218	{
	219	s32 new_setpoint, temp, power;
	220	int rc;
	221
	222	if (--st->ticks != 0) {
	223	if (wf_smu_readjust)
	224	goto readjust;
	225	return;
	226	}
	227	st->ticks = WF_SMU_CPU_FANS_INTERVAL;
	228
33e6820b	229	rc = wf_sensor_get(sensor_cpu_temp, &temp);
75722d39 BH	230	if (rc) {
	231	printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
	232	rc);
	233	wf_smu_failure_state \|= FAILURE_SENSOR;
	234	return;
	235	}
	236
ca7d593e	237	rc = wf_sensor_get(sensor_cpu_power, &power);
75722d39 BH	238	if (rc) {
	239	printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
	240	rc);
	241	wf_smu_failure_state \|= FAILURE_SENSOR;
	242	return;
	243	}
	244
	245	DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
	246	FIX32TOPRINT(temp), FIX32TOPRINT(power));
	247
	248	#ifdef HACKED_OVERTEMP
	249	if (temp > 0x4a0000)
	250	wf_smu_failure_state \|= FAILURE_OVERTEMP;
	251	#else
	252	if (temp > st->pid.param.tmax)
	253	wf_smu_failure_state \|= FAILURE_OVERTEMP;
	254	#endif
	255	new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
	256
	257	DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
	258
	259	if (st->cpu_setpoint == new_setpoint)
	260	return;
	261	st->cpu_setpoint = new_setpoint;
	262	readjust:
	263	if (fan_cpu_main && wf_smu_failure_state == 0) {
33e6820b	264	rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
75722d39 BH	265	if (rc) {
	266	printk(KERN_WARNING "windfarm: CPU main fan"
	267	" error %d\n", rc);
	268	wf_smu_failure_state \|= FAILURE_FAN;
	269	}
	270	}
	271	if (fan_cpu_second && wf_smu_failure_state == 0) {
33e6820b	272	rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
75722d39 BH	273	if (rc) {
	274	printk(KERN_WARNING "windfarm: CPU second fan"
	275	" error %d\n", rc);
	276	wf_smu_failure_state \|= FAILURE_FAN;
	277	}
	278	}
	279	if (fan_cpu_third && wf_smu_failure_state == 0) {
33e6820b	280	rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
75722d39 BH	281	if (rc) {
	282	printk(KERN_WARNING "windfarm: CPU third fan"
	283	" error %d\n", rc);
	284	wf_smu_failure_state \|= FAILURE_FAN;
	285	}
	286	}
	287	}
	288
	289	static void wf_smu_create_drive_fans(void)
	290	{
	291	struct wf_pid_param param = {
	292	.interval = 5,
	293	.history_len = 2,
	294	.gd = 0x01e00000,
	295	.gp = 0x00500000,
	296	.gr = 0x00000000,
	297	.itarget = 0x00200000,
	298	};
	299
	300	/* Alloc & initialize state */
	301	wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
	302	GFP_KERNEL);
	303	if (wf_smu_drive_fans == NULL) {
	304	printk(KERN_WARNING "windfarm: Memory allocation error"
	305	" max fan speed\n");
	306	goto fail;
	307	}
	308	wf_smu_drive_fans->ticks = 1;
	309
	310	/* Fill PID params */
	311	param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
33e6820b BH	312	param.min = wf_control_get_min(fan_hd);
33e6820b BH	313	param.max = wf_control_get_max(fan_hd);
75722d39 BH	314	wf_pid_init(&wf_smu_drive_fans->pid, &param);
	315
	316	DBG("wf: Drive Fan control initialized.\n");
	317	DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
	318	FIX32TOPRINT(param.itarget), param.min, param.max);
	319	return;
	320
	321	fail:
	322	if (fan_hd)
	323	wf_control_set_max(fan_hd);
	324	}
	325
	326	static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
	327	{
	328	s32 new_setpoint, temp;
	329	int rc;
	330
	331	if (--st->ticks != 0) {
	332	if (wf_smu_readjust)
	333	goto readjust;
	334	return;
	335	}
	336	st->ticks = st->pid.param.interval;
	337
33e6820b	338	rc = wf_sensor_get(sensor_hd_temp, &temp);
75722d39 BH	339	if (rc) {
	340	printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
	341	rc);
	342	wf_smu_failure_state \|= FAILURE_SENSOR;
	343	return;
	344	}
	345
	346	DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
	347	FIX32TOPRINT(temp));
	348
	349	if (temp > (st->pid.param.itarget + 0x50000))
	350	wf_smu_failure_state \|= FAILURE_OVERTEMP;
	351
	352	new_setpoint = wf_pid_run(&st->pid, temp);
	353
	354	DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
	355
	356	if (st->setpoint == new_setpoint)
	357	return;
	358	st->setpoint = new_setpoint;
	359	readjust:
	360	if (fan_hd && wf_smu_failure_state == 0) {
33e6820b	361	rc = wf_control_set(fan_hd, st->setpoint);
75722d39 BH	362	if (rc) {
	363	printk(KERN_WARNING "windfarm: HD fan error %d\n",
	364	rc);
	365	wf_smu_failure_state \|= FAILURE_FAN;
	366	}
	367	}
	368	}
	369
	370	static void wf_smu_create_slots_fans(void)
	371	{
	372	struct wf_pid_param param = {
	373	.interval = 1,
	374	.history_len = 8,
	375	.gd = 0x00000000,
	376	.gp = 0x00000000,
	377	.gr = 0x00020000,
	378	.itarget = 0x00000000
	379	};
	380
	381	/* Alloc & initialize state */
	382	wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
	383	GFP_KERNEL);
	384	if (wf_smu_slots_fans == NULL) {
	385	printk(KERN_WARNING "windfarm: Memory allocation error"
	386	" max fan speed\n");
	387	goto fail;
	388	}
	389	wf_smu_slots_fans->ticks = 1;
	390
	391	/* Fill PID params */
	392	param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
33e6820b BH	393	param.min = wf_control_get_min(fan_slots);
33e6820b BH	394	param.max = wf_control_get_max(fan_slots);
75722d39 BH	395	wf_pid_init(&wf_smu_slots_fans->pid, &param);
	396
	397	DBG("wf: Slots Fan control initialized.\n");
	398	DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
	399	FIX32TOPRINT(param.itarget), param.min, param.max);
	400	return;
	401
	402	fail:
	403	if (fan_slots)
	404	wf_control_set_max(fan_slots);
	405	}
	406
	407	static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
	408	{
	409	s32 new_setpoint, power;
	410	int rc;
	411
	412	if (--st->ticks != 0) {
	413	if (wf_smu_readjust)
	414	goto readjust;
	415	return;
	416	}
	417	st->ticks = st->pid.param.interval;
	418
33e6820b	419	rc = wf_sensor_get(sensor_slots_power, &power);
75722d39 BH	420	if (rc) {
	421	printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
	422	rc);
	423	wf_smu_failure_state \|= FAILURE_SENSOR;
	424	return;
	425	}
	426
	427	DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
	428	FIX32TOPRINT(power));
	429
	430	#if 0 /* Check what makes a good overtemp condition */
	431	if (power > (st->pid.param.itarget + 0x50000))
	432	wf_smu_failure_state \|= FAILURE_OVERTEMP;
	433	#endif
	434
	435	new_setpoint = wf_pid_run(&st->pid, power);
	436
	437	DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
	438
	439	if (st->setpoint == new_setpoint)
	440	return;
	441	st->setpoint = new_setpoint;
	442	readjust:
	443	if (fan_slots && wf_smu_failure_state == 0) {
33e6820b	444	rc = wf_control_set(fan_slots, st->setpoint);
75722d39 BH	445	if (rc) {
	446	printk(KERN_WARNING "windfarm: Slots fan error %d\n",
	447	rc);
	448	wf_smu_failure_state \|= FAILURE_FAN;
	449	}
	450	}
	451	}
	452
	453
75722d39 BH	454	/*
	455	* **** Setup / Init / Misc ... ****
	456	*
	457	*/
	458
	459	static void wf_smu_tick(void)
	460	{
	461	unsigned int last_failure = wf_smu_failure_state;
	462	unsigned int new_failure;
	463
	464	if (!wf_smu_started) {
	465	DBG("wf: creating control loops !\n");
	466	wf_smu_create_drive_fans();
	467	wf_smu_create_slots_fans();
	468	wf_smu_create_cpu_fans();
	469	wf_smu_started = 1;
	470	}
	471
	472	/* Skipping ticks */
	473	if (wf_smu_skipping && --wf_smu_skipping)
	474	return;
	475
	476	wf_smu_failure_state = 0;
	477	if (wf_smu_drive_fans)
	478	wf_smu_drive_fans_tick(wf_smu_drive_fans);
	479	if (wf_smu_slots_fans)
	480	wf_smu_slots_fans_tick(wf_smu_slots_fans);
	481	if (wf_smu_cpu_fans)
	482	wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
	483
	484	wf_smu_readjust = 0;
	485	new_failure = wf_smu_failure_state & ~last_failure;
	486
	487	/* If entering failure mode, clamp cpufreq and ramp all
	488	* fans to full speed.
	489	*/
	490	if (wf_smu_failure_state && !last_failure) {
	491	if (cpufreq_clamp)
	492	wf_control_set_max(cpufreq_clamp);
	493	if (fan_cpu_main)
	494	wf_control_set_max(fan_cpu_main);
	495	if (fan_cpu_second)
	496	wf_control_set_max(fan_cpu_second);
	497	if (fan_cpu_third)
	498	wf_control_set_max(fan_cpu_third);
	499	if (fan_hd)
	500	wf_control_set_max(fan_hd);
	501	if (fan_slots)
	502	wf_control_set_max(fan_slots);
	503	}
	504
	505	/* If leaving failure mode, unclamp cpufreq and readjust
	506	* all fans on next iteration
	507	*/
	508	if (!wf_smu_failure_state && last_failure) {
	509	if (cpufreq_clamp)
	510	wf_control_set_min(cpufreq_clamp);
	511	wf_smu_readjust = 1;
	512	}
	513
	514	/* Overtemp condition detected, notify and start skipping a couple
	515	* ticks to let the temperature go down
	516	*/
	517	if (new_failure & FAILURE_OVERTEMP) {
518	wf_set_overtemp();
519	wf_smu_skipping = 2;
520	}
521
522	/* We only clear the overtemp condition if overtemp is cleared
523	* _and_ no other failure is present. Since a sensor error will
524	* clear the overtemp condition (can't measure temperature) at
525	* the control loop levels, but we don't want to keep it clear
526	* here in this case
527	*/
528	if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
529	wf_clear_overtemp();
530	}
531
532
533	static void wf_smu_new_control(struct wf_control *ct)
534	{
535	if (wf_smu_all_controls_ok)
536	return;
537
538	if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
ac171c46	539	if (wf_get_control(ct) == 0)
75722d39	540	fan_cpu_main = ct;
75722d39 BH	541	}
	542
	543	if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
	544	if (wf_get_control(ct) == 0)
	545	fan_cpu_second = ct;
	546	}
	547
	548	if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
	549	if (wf_get_control(ct) == 0)
	550	fan_cpu_third = ct;
	551	}
	552
	553	if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
	554	if (wf_get_control(ct) == 0)
	555	cpufreq_clamp = ct;
	556	}
	557
	558	if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
ac171c46	559	if (wf_get_control(ct) == 0)
75722d39	560	fan_hd = ct;
75722d39 BH	561	}
	562
	563	if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
ac171c46	564	if (wf_get_control(ct) == 0)
75722d39	565	fan_slots = ct;
75722d39 BH	566	}
	567
	568	if (fan_cpu_main && (fan_cpu_second \|\| fan_cpu_third) && fan_hd &&
	569	fan_slots && cpufreq_clamp)
	570	wf_smu_all_controls_ok = 1;
	571	}
	572
	573	static void wf_smu_new_sensor(struct wf_sensor *sr)
	574	{
	575	if (wf_smu_all_sensors_ok)
	576	return;
	577
	578	if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
ac171c46	579	if (wf_get_sensor(sr) == 0)
75722d39	580	sensor_cpu_power = sr;
75722d39 BH	581	}
	582
	583	if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
ac171c46	584	if (wf_get_sensor(sr) == 0)
75722d39	585	sensor_cpu_temp = sr;
75722d39 BH	586	}
	587
	588	if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
ac171c46	589	if (wf_get_sensor(sr) == 0)
75722d39	590	sensor_hd_temp = sr;
75722d39 BH	591	}
	592
	593	if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
ac171c46	594	if (wf_get_sensor(sr) == 0)
75722d39	595	sensor_slots_power = sr;
75722d39 BH	596	}
	597
	598	if (sensor_cpu_power && sensor_cpu_temp &&
	599	sensor_hd_temp && sensor_slots_power)
	600	wf_smu_all_sensors_ok = 1;
	601	}
	602
	603
	604	static int wf_smu_notify(struct notifier_block *self,
	605	unsigned long event, void *data)
	606	{
	607	switch(event) {
	608	case WF_EVENT_NEW_CONTROL:
	609	DBG("wf: new control %s detected\n",
	610	((struct wf_control *)data)->name);
	611	wf_smu_new_control(data);
	612	wf_smu_readjust = 1;
	613	break;
	614	case WF_EVENT_NEW_SENSOR:
	615	DBG("wf: new sensor %s detected\n",
	616	((struct wf_sensor *)data)->name);
	617	wf_smu_new_sensor(data);
	618	break;
	619	case WF_EVENT_TICK:
	620	if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
	621	wf_smu_tick();
	622	}
	623
	624	return 0;
	625	}
	626
	627	static struct notifier_block wf_smu_events = {
	628	.notifier_call = wf_smu_notify,
	629	};
	630
	631	static int wf_init_pm(void)
	632	{
	633	printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
	634
	635	return 0;
	636	}
	637
10270613	638	static int wf_smu_probe(struct platform_device *ddev)
75722d39	639	{
75722d39 BH	640	wf_register_client(&wf_smu_events);
	641
	642	return 0;
	643	}
	644
1da42fb6	645	static int wf_smu_remove(struct platform_device *ddev)
75722d39 BH	646	{
	647	wf_unregister_client(&wf_smu_events);
	648
	649	/* XXX We don't have yet a guarantee that our callback isn't
	650	* in progress when returning from wf_unregister_client, so
	651	* we add an arbitrary delay. I'll have to fix that in the core
	652	*/
	653	msleep(1000);
	654
	655	/* Release all sensors */
	656	/* One more crappy race: I don't think we have any guarantee here
	657	* that the attribute callback won't race with the sensor beeing
	658	* disposed of, and I'm not 100% certain what best way to deal
	659	* with that except by adding locks all over... I'll do that
	660	* eventually but heh, who ever rmmod this module anyway ?
	661	*/
ac171c46	662	if (sensor_cpu_power)
75722d39	663	wf_put_sensor(sensor_cpu_power);
ac171c46	664	if (sensor_cpu_temp)
75722d39	665	wf_put_sensor(sensor_cpu_temp);
ac171c46	666	if (sensor_hd_temp)
75722d39	667	wf_put_sensor(sensor_hd_temp);
ac171c46	668	if (sensor_slots_power)
75722d39	669	wf_put_sensor(sensor_slots_power);
75722d39 BH	670
75722d39 BH	671	/* Release all controls */
ac171c46	672	if (fan_cpu_main)
75722d39	673	wf_put_control(fan_cpu_main);
75722d39 BH	674	if (fan_cpu_second)
	675	wf_put_control(fan_cpu_second);
	676	if (fan_cpu_third)
	677	wf_put_control(fan_cpu_third);
ac171c46	678	if (fan_hd)
75722d39	679	wf_put_control(fan_hd);
ac171c46	680	if (fan_slots)
75722d39	681	wf_put_control(fan_slots);
75722d39 BH	682	if (cpufreq_clamp)
	683	wf_put_control(cpufreq_clamp);
	684
	685	/* Destroy control loops state structures */
ab30f78c JL	686	kfree(wf_smu_slots_fans);
	687	kfree(wf_smu_drive_fans);
	688	kfree(wf_smu_cpu_fans);
75722d39	689
75722d39 BH	690	return 0;
	691	}
	692
10270613	693	static struct platform_driver wf_smu_driver = {
75722d39	694	.probe = wf_smu_probe,
1da42fb6	695	.remove = wf_smu_remove,
10270613 BH	696	.driver = {
10270613 BH	697	.name = "windfarm",
23386fe5	698	.owner = THIS_MODULE,
10270613	699	},
75722d39 BH	700	};
	701
	702
	703	static int __init wf_smu_init(void)
	704	{
	705	int rc = -ENODEV;
	706
71a157e8	707	if (of_machine_is_compatible("PowerMac9,1"))
75722d39 BH	708	rc = wf_init_pm();
	709
	710	if (rc == 0) {
	711	#ifdef MODULE
	712	request_module("windfarm_smu_controls");
	713	request_module("windfarm_smu_sensors");
	714	request_module("windfarm_lm75_sensor");
d31e8171	715	request_module("windfarm_cpufreq_clamp");
75722d39 BH	716
75722d39 BH	717	#endif /* MODULE */
10270613	718	platform_driver_register(&wf_smu_driver);
75722d39 BH	719	}
	720
	721	return rc;
	722	}
	723
	724	static void __exit wf_smu_exit(void)
	725	{
	726
10270613	727	platform_driver_unregister(&wf_smu_driver);
75722d39 BH	728	}
	729
	730
	731	module_init(wf_smu_init);
	732	module_exit(wf_smu_exit);
	733
	734	MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
	735	MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
	736	MODULE_LICENSE("GPL");
	737
23386fe5	738	MODULE_ALIAS("platform:windfarm");