[linux-2.6-block.git] / drivers / macintosh / therm_adt746x.c

/*
 * Device driver for the i2c thermostat found on the iBook G4, Albook G4
 *
 * Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt
 *
 * Documentation from
 * http://www.analog.com/UploadedFiles/Data_Sheets/115254175ADT7467_pra.pdf
 * http://www.analog.com/UploadedFiles/Data_Sheets/3686221171167ADT7460_b.pdf
 *
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/suspend.h>
#include <linux/kthread.h>
#include <linux/moduleparam.h>
#include <linux/freezer.h>

#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/of_platform.h>

#undef DEBUG

#define CONFIG_REG   0x40
#define MANUAL_MASK  0xe0
#define AUTO_MASK    0x20

static u8 TEMP_REG[3]    = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
static u8 LIMIT_REG[3]   = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
static u8 MANUAL_MODE[2] = {0x5c, 0x5d};       
static u8 REM_CONTROL[2] = {0x00, 0x40};
static u8 FAN_SPEED[2]   = {0x28, 0x2a};
static u8 FAN_SPD_SET[2] = {0x30, 0x31};

static u8 default_limits_local[3] = {70, 50, 70};    /* local, sensor1, sensor2 */
static u8 default_limits_chip[3] = {80, 65, 80};    /* local, sensor1, sensor2 */
static const char *sensor_location[3];

static int limit_adjust;
static int fan_speed = -1;
static int verbose;

MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and "
		   "Powerbook G4 Alu");
MODULE_LICENSE("GPL");

module_param(limit_adjust, int, 0644);
MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) "
		 "by N degrees.");

module_param(fan_speed, int, 0644);
MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
		 "(default 64)");

module_param(verbose, bool, 0);
MODULE_PARM_DESC(verbose,"Verbose log operations "
		 "(default 0)");

struct thermostat {
	struct i2c_client	clt;
	u8			temps[3];
	u8			cached_temp[3];
	u8			initial_limits[3];
	u8			limits[3];
	int			last_speed[2];
	int			last_var[2];
};

static enum {ADT7460, ADT7467} therm_type;
static int therm_bus, therm_address;
static struct of_device * of_dev;
static struct thermostat* thermostat;
static struct task_struct *thread_therm = NULL;

static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
				 int busno);

static void write_both_fan_speed(struct thermostat *th, int speed);
static void write_fan_speed(struct thermostat *th, int speed, int fan);

static int
write_reg(struct thermostat* th, int reg, u8 data)
{
	u8 tmp[2];
	int rc;
	
	tmp[0] = reg;
	tmp[1] = data;
	rc = i2c_master_send(&th->clt, (const char *)tmp, 2);
	if (rc < 0)
		return rc;
	if (rc != 2)
		return -ENODEV;
	return 0;
}

static int
read_reg(struct thermostat* th, int reg)
{
	u8 reg_addr, data;
	int rc;

	reg_addr = (u8)reg;
	rc = i2c_master_send(&th->clt, &reg_addr, 1);
	if (rc < 0)
		return rc;
	if (rc != 1)
		return -ENODEV;
	rc = i2c_master_recv(&th->clt, (char *)&data, 1);
	if (rc < 0)
		return rc;
	return data;
}

static int
attach_thermostat(struct i2c_adapter *adapter)
{
	unsigned long bus_no;

	if (strncmp(adapter->name, "uni-n", 5))
		return -ENODEV;
	bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
	if (bus_no != therm_bus)
		return -ENODEV;
	return attach_one_thermostat(adapter, therm_address, bus_no);
}

static int
detach_thermostat(struct i2c_adapter *adapter)
{
	struct thermostat* th;
	int i;
	
	if (thermostat == NULL)
		return 0;

	th = thermostat;

	if (thread_therm != NULL) {
		kthread_stop(thread_therm);
	}

	printk(KERN_INFO "adt746x: Putting max temperatures back from "
			 "%d, %d, %d to %d, %d, %d\n",
		th->limits[0], th->limits[1], th->limits[2],
		th->initial_limits[0], th->initial_limits[1],
		th->initial_limits[2]);

	for (i = 0; i < 3; i++)
		write_reg(th, LIMIT_REG[i], th->initial_limits[i]);

	write_both_fan_speed(th, -1);

	i2c_detach_client(&th->clt);

	thermostat = NULL;

	kfree(th);

	return 0;
}

static struct i2c_driver thermostat_driver = {  
	.driver = {
		.name	= "therm_adt746x",
	},
	.attach_adapter	= attach_thermostat,
	.detach_adapter	= detach_thermostat,
};

static int read_fan_speed(struct thermostat *th, u8 addr)
{
	u8 tmp[2];
	u16 res;
	
	/* should start with low byte */
	tmp[1] = read_reg(th, addr);
	tmp[0] = read_reg(th, addr + 1);
	
	res = tmp[1] + (tmp[0] << 8);
	/* "a value of 0xffff means that the fan has stopped" */
	return (res == 0xffff ? 0 : (90000*60)/res);
}

static void write_both_fan_speed(struct thermostat *th, int speed)
{
	write_fan_speed(th, speed, 0);
	if (therm_type == ADT7460)
		write_fan_speed(th, speed, 1);
}

static void write_fan_speed(struct thermostat *th, int speed, int fan)
{
	u8 manual;
	
	if (speed > 0xff) 
		speed = 0xff;
	else if (speed < -1) 
		speed = 0;
	
	if (therm_type == ADT7467 && fan == 1)
		return;
	
	if (th->last_speed[fan] != speed) {
		if (verbose) {
			if (speed == -1)
				printk(KERN_DEBUG "adt746x: Setting speed to automatic "
					"for %s fan.\n", sensor_location[fan+1]);
			else
				printk(KERN_DEBUG "adt746x: Setting speed to %d "
					"for %s fan.\n", speed, sensor_location[fan+1]);
		}
	} else
		return;
	
	if (speed >= 0) {
		manual = read_reg(th, MANUAL_MODE[fan]);
		write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
		write_reg(th, FAN_SPD_SET[fan], speed);
	} else {
		/* back to automatic */
		if(therm_type == ADT7460) {
			manual = read_reg(th,
				MANUAL_MODE[fan]) & (~MANUAL_MASK);

			write_reg(th,
				MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
		} else {
			manual = read_reg(th, MANUAL_MODE[fan]);
			write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
		}
	}
	
	th->last_speed[fan] = speed;			
}

static void read_sensors(struct thermostat *th)
{
	int i = 0;

	for (i = 0; i < 3; i++)
		th->temps[i]  = read_reg(th, TEMP_REG[i]);
}

#ifdef DEBUG
static void display_stats(struct thermostat *th)
{
	if (th->temps[0] != th->cached_temp[0]
	||  th->temps[1] != th->cached_temp[1]
	||  th->temps[2] != th->cached_temp[2]) {
		printk(KERN_INFO "adt746x: Temperature infos:"
				 " thermostats: %d,%d,%d;"
				 " limits: %d,%d,%d;"
				 " fan speed: %d RPM\n",
				 th->temps[0], th->temps[1], th->temps[2],
				 th->limits[0],  th->limits[1],  th->limits[2],
				 read_fan_speed(th, FAN_SPEED[0]));
	}
	th->cached_temp[0] = th->temps[0];
	th->cached_temp[1] = th->temps[1];
	th->cached_temp[2] = th->temps[2];
}
#endif

static void update_fans_speed (struct thermostat *th)
{
	int lastvar = 0; /* last variation, for iBook */
	int i = 0;

	/* we don't care about local sensor, so we start at sensor 1 */
	for (i = 1; i < 3; i++) {
		int started = 0;
		int fan_number = (therm_type == ADT7460 && i == 2);
		int var = th->temps[i] - th->limits[i];

		if (var > -1) {
			int step = (255 - fan_speed) / 7;
			int new_speed = 0;

			/* hysteresis : change fan speed only if variation is
			 * more than two degrees */
			if (abs(var - th->last_var[fan_number]) < 2)
				continue;

			started = 1;
			new_speed = fan_speed + ((var-1)*step);

			if (new_speed < fan_speed)
				new_speed = fan_speed;
			if (new_speed > 255)
				new_speed = 255;

			if (verbose)
				printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
						 "(limit exceeded by %d on %s) \n",
						new_speed, var,
						sensor_location[fan_number+1]);
			write_both_fan_speed(th, new_speed);
			th->last_var[fan_number] = var;
		} else if (var < -2) {
			/* don't stop fan if sensor2 is cold and sensor1 is not
			 * so cold (lastvar >= -1) */
			if (i == 2 && lastvar < -1) {
				if (th->last_speed[fan_number] != 0)
					if (verbose)
						printk(KERN_DEBUG "adt746x: Stopping "
							"fans.\n");
				write_both_fan_speed(th, 0);
			}
		}

		lastvar = var;

		if (started)
			return; /* we don't want to re-stop the fan
				* if sensor1 is heating and sensor2 is not */
	}
}

static int monitor_task(void *arg)
{
	struct thermostat* th = arg;

	set_freezable();
	while(!kthread_should_stop()) {
		try_to_freeze();
		msleep_interruptible(2000);

#ifndef DEBUG
		if (fan_speed != -1)
			read_sensors(th);
#else
		read_sensors(th);
#endif		

		if (fan_speed != -1)
			update_fans_speed(th);

#ifdef DEBUG
		display_stats(th);
#endif

	}

	return 0;
}

static void set_limit(struct thermostat *th, int i)
{
		/* Set sensor1 limit higher to avoid powerdowns */
		th->limits[i] = default_limits_chip[i] + limit_adjust;
		write_reg(th, LIMIT_REG[i], th->limits[i]);
		
		/* set our limits to normal */
		th->limits[i] = default_limits_local[i] + limit_adjust;
}

static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
				 int busno)
{
	struct thermostat* th;
	int rc;
	int i;

	if (thermostat)
		return 0;

	th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
	if (!th)
		return -ENOMEM;

	th->clt.addr = addr;
	th->clt.adapter = adapter;
	th->clt.driver = &thermostat_driver;
	strcpy(th->clt.name, "thermostat");

	rc = read_reg(th, 0);
	if (rc < 0) {
		printk(KERN_ERR "adt746x: Thermostat failed to read config "
				"from bus %d !\n",
				busno);
		kfree(th);
		return -ENODEV;
	}

	/* force manual control to start the fan quieter */
	if (fan_speed == -1)
		fan_speed = 64;
	
	if(therm_type == ADT7460) {
		printk(KERN_INFO "adt746x: ADT7460 initializing\n");
		/* The 7460 needs to be started explicitly */
		write_reg(th, CONFIG_REG, 1);
	} else
		printk(KERN_INFO "adt746x: ADT7467 initializing\n");

	for (i = 0; i < 3; i++) {
		th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
		set_limit(th, i);
	}

	printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
			 " to %d, %d, %d\n",
			 th->initial_limits[0], th->initial_limits[1],
			 th->initial_limits[2], th->limits[0], th->limits[1],
			 th->limits[2]);

	thermostat = th;

	if (i2c_attach_client(&th->clt)) {
		printk(KERN_INFO "adt746x: Thermostat failed to attach "
				 "client !\n");
		thermostat = NULL;
		kfree(th);
		return -ENODEV;
	}

	/* be sure to really write fan speed the first time */
	th->last_speed[0] = -2;
	th->last_speed[1] = -2;
	th->last_var[0] = -80;
	th->last_var[1] = -80;

	if (fan_speed != -1) {
		/* manual mode, stop fans */
		write_both_fan_speed(th, 0);
	} else {
		/* automatic mode */
		write_both_fan_speed(th, -1);
	}
	
	thread_therm = kthread_run(monitor_task, th, "kfand");

	if (thread_therm == ERR_PTR(-ENOMEM)) {
		printk(KERN_INFO "adt746x: Kthread creation failed\n");
		thread_therm = NULL;
		return -ENOMEM;
	}

	return 0;
}

/* 
 * Now, unfortunately, sysfs doesn't give us a nice void * we could
 * pass around to the attribute functions, so we don't really have
 * choice but implement a bunch of them...
 *
 * FIXME, it does now...
 */
#define BUILD_SHOW_FUNC_INT(name, data)				\
static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)	\
{								\
	return sprintf(buf, "%d\n", data);			\
}

#define BUILD_SHOW_FUNC_STR(name, data)				\
static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
{								\
	return sprintf(buf, "%s\n", data);			\
}

#define BUILD_SHOW_FUNC_FAN(name, data)				\
static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)       \
{								\
	return sprintf(buf, "%d (%d rpm)\n", 			\
		thermostat->last_speed[data],			\
		read_fan_speed(thermostat, FAN_SPEED[data])	\
		);						\
}

#define BUILD_STORE_FUNC_DEG(name, data)			\
static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
{								\
	int val;						\
	int i;							\
	val = simple_strtol(buf, NULL, 10);			\
	printk(KERN_INFO "Adjusting limits by %d degrees\n", val);	\
	limit_adjust = val;					\
	for (i=0; i < 3; i++)					\
		set_limit(thermostat, i);			\
	return n;						\
}

#define BUILD_STORE_FUNC_INT(name, data)			\
static ssize_t store_##name(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) \
{								\
	u32 val;						\
	val = simple_strtoul(buf, NULL, 10);			\
	if (val < 0 || val > 255)				\
		return -EINVAL;					\
	printk(KERN_INFO "Setting specified fan speed to %d\n", val);	\
	data = val;						\
	return n;						\
}

BUILD_SHOW_FUNC_INT(sensor1_temperature,	 (read_reg(thermostat, TEMP_REG[1])))
BUILD_SHOW_FUNC_INT(sensor2_temperature,	 (read_reg(thermostat, TEMP_REG[2])))
BUILD_SHOW_FUNC_INT(sensor1_limit,		 thermostat->limits[1])
BUILD_SHOW_FUNC_INT(sensor2_limit,		 thermostat->limits[2])
BUILD_SHOW_FUNC_STR(sensor1_location,		 sensor_location[1])
BUILD_SHOW_FUNC_STR(sensor2_location,		 sensor_location[2])

BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,	 0)
BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,	 1)

BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
BUILD_SHOW_FUNC_INT(limit_adjust,	 limit_adjust)
BUILD_STORE_FUNC_DEG(limit_adjust,	 thermostat)
		
static DEVICE_ATTR(sensor1_temperature,	S_IRUGO,
		   show_sensor1_temperature,NULL);
static DEVICE_ATTR(sensor2_temperature,	S_IRUGO,
		   show_sensor2_temperature,NULL);
static DEVICE_ATTR(sensor1_limit, S_IRUGO,
		   show_sensor1_limit,	NULL);
static DEVICE_ATTR(sensor2_limit, S_IRUGO,
		   show_sensor2_limit,	NULL);
static DEVICE_ATTR(sensor1_location, S_IRUGO,
		   show_sensor1_location, NULL);
static DEVICE_ATTR(sensor2_location, S_IRUGO,
		   show_sensor2_location, NULL);

static DEVICE_ATTR(specified_fan_speed,	S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
		   show_specified_fan_speed,store_specified_fan_speed);

static DEVICE_ATTR(sensor1_fan_speed,	S_IRUGO,
		   show_sensor1_fan_speed,	NULL);
static DEVICE_ATTR(sensor2_fan_speed,	S_IRUGO,
		   show_sensor2_fan_speed,	NULL);

static DEVICE_ATTR(limit_adjust,	S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH,
		   show_limit_adjust,	store_limit_adjust);


static int __init
thermostat_init(void)
{
	struct device_node* np;
	const u32 *prop;
	int i = 0, offset = 0;
	int err;
	
	np = of_find_node_by_name(NULL, "fan");
	if (!np)
		return -ENODEV;
	if (of_device_is_compatible(np, "adt7460"))
		therm_type = ADT7460;
	else if (of_device_is_compatible(np, "adt7467"))
		therm_type = ADT7467;
	else {
		of_node_put(np);
		return -ENODEV;
	}

	prop = of_get_property(np, "hwsensor-params-version", NULL);
	printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
			 (*prop == 1)?"":"un");
	if (*prop != 1) {
		of_node_put(np);
		return -ENODEV;
	}

	prop = of_get_property(np, "reg", NULL);
	if (!prop) {
		of_node_put(np);
		return -ENODEV;
	}

	/* look for bus either by path or using "reg" */
	if (strstr(np->full_name, "/i2c-bus@") != NULL) {
		const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
		therm_bus = tmp_bus[0]-'0';
	} else {
		therm_bus = ((*prop) >> 8) & 0x0f;
	}

	therm_address = ((*prop) & 0xff) >> 1;

	printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
			 "limit_adjust: %d, fan_speed: %d\n",
			 therm_bus, therm_address, limit_adjust, fan_speed);

	if (of_get_property(np, "hwsensor-location", NULL)) {
		for (i = 0; i < 3; i++) {
			sensor_location[i] = of_get_property(np,
					"hwsensor-location", NULL) + offset;

			if (sensor_location[i] == NULL)
				sensor_location[i] = "";

			printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
			offset += strlen(sensor_location[i]) + 1;
		}
	} else {
		sensor_location[0] = "?";
		sensor_location[1] = "?";
		sensor_location[2] = "?";
	}

	of_dev = of_platform_device_create(np, "temperatures", NULL);
	
	if (of_dev == NULL) {
		printk(KERN_ERR "Can't register temperatures device !\n");
		of_node_put(np);
		return -ENODEV;
	}
	
	err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
	err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
	err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
	err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
	err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
	err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
	err |= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
	err |= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
	err |= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
	if(therm_type == ADT7460)
		err |= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
	if (err)
		printk(KERN_WARNING
			"Failed to create tempertaure attribute file(s).\n");

#ifndef CONFIG_I2C_POWERMAC
	request_module("i2c-powermac");
#endif

	return i2c_add_driver(&thermostat_driver);
}

static void __exit
thermostat_exit(void)
{
	if (of_dev) {
		device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
		device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
		device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
		device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
		device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
		device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
		device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
		device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
		device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);

		if(therm_type == ADT7460)
			device_remove_file(&of_dev->dev,
					   &dev_attr_sensor2_fan_speed);

		of_device_unregister(of_dev);
	}
	i2c_del_driver(&thermostat_driver);
}

module_init(thermostat_init);
module_exit(thermostat_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Device driver for the i2c thermostat found on the iBook G4, Albook G4
	3	*
	4	* Copyright (C) 2003, 2004 Colin Leroy, Rasmus Rohde, Benjamin Herrenschmidt
	5	*
	6	* Documentation from
	7	* http://www.analog.com/UploadedFiles/Data_Sheets/115254175ADT7467_pra.pdf
	8	* http://www.analog.com/UploadedFiles/Data_Sheets/3686221171167ADT7460_b.pdf
	9	*
	10	*/
	11
1da177e4 LT	12	#include <linux/types.h>
	13	#include <linux/module.h>
	14	#include <linux/errno.h>
	15	#include <linux/kernel.h>
	16	#include <linux/delay.h>
	17	#include <linux/sched.h>
	18	#include <linux/i2c.h>
	19	#include <linux/slab.h>
	20	#include <linux/init.h>
	21	#include <linux/spinlock.h>
1da177e4 LT	22	#include <linux/wait.h>
	23	#include <linux/suspend.h>
	24	#include <linux/kthread.h>
	25	#include <linux/moduleparam.h>
7dfb7103	26	#include <linux/freezer.h>
1da177e4 LT	27
	28	#include <asm/prom.h>
	29	#include <asm/machdep.h>
	30	#include <asm/io.h>
	31	#include <asm/system.h>
	32	#include <asm/sections.h>
7eebde70	33	#include <asm/of_platform.h>
1da177e4 LT	34
	35	#undef DEBUG
	36
	37	#define CONFIG_REG 0x40
	38	#define MANUAL_MASK 0xe0
	39	#define AUTO_MASK 0x20
	40
d20c507f CL	41	static u8 TEMP_REG[3] = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
d20c507f CL	42	static u8 LIMIT_REG[3] = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
1da177e4 LT	43	static u8 MANUAL_MODE[2] = {0x5c, 0x5d};
	44	static u8 REM_CONTROL[2] = {0x00, 0x40};
	45	static u8 FAN_SPEED[2] = {0x28, 0x2a};
	46	static u8 FAN_SPD_SET[2] = {0x30, 0x31};
	47
d20c507f CL	48	static u8 default_limits_local[3] = {70, 50, 70}; /* local, sensor1, sensor2 */
d20c507f CL	49	static u8 default_limits_chip[3] = {80, 65, 80}; /* local, sensor1, sensor2 */
87275856	50	static const char *sensor_location[3];
1da177e4	51
87275856	52	static int limit_adjust;
1da177e4	53	static int fan_speed = -1;
87275856	54	static int verbose;
1da177e4 LT	55
	56	MODULE_AUTHOR("Colin Leroy <colin@colino.net>");
	57	MODULE_DESCRIPTION("Driver for ADT746x thermostat in iBook G4 and "
	58	"Powerbook G4 Alu");
	59	MODULE_LICENSE("GPL");
	60
	61	module_param(limit_adjust, int, 0644);
d20c507f	62	MODULE_PARM_DESC(limit_adjust,"Adjust maximum temperatures (50 sensor1, 70 sensor2) "
1da177e4 LT	63	"by N degrees.");
	64
	65	module_param(fan_speed, int, 0644);
	66	MODULE_PARM_DESC(fan_speed,"Specify starting fan speed (0-255) "
	67	"(default 64)");
	68
9f6d4b0c BC	69	module_param(verbose, bool, 0);
	70	MODULE_PARM_DESC(verbose,"Verbose log operations "
	71	"(default 0)");
	72
1da177e4 LT	73	struct thermostat {
	74	struct i2c_client clt;
	75	u8 temps[3];
	76	u8 cached_temp[3];
	77	u8 initial_limits[3];
	78	u8 limits[3];
	79	int last_speed[2];
	80	int last_var[2];
	81	};
	82
	83	static enum {ADT7460, ADT7467} therm_type;
	84	static int therm_bus, therm_address;
	85	static struct of_device * of_dev;
	86	static struct thermostat* thermostat;
	87	static struct task_struct *thread_therm = NULL;
	88
	89	static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
	90	int busno);
	91
	92	static void write_both_fan_speed(struct thermostat *th, int speed);
	93	static void write_fan_speed(struct thermostat *th, int speed, int fan);
	94
	95	static int
	96	write_reg(struct thermostat* th, int reg, u8 data)
	97	{
	98	u8 tmp[2];
	99	int rc;
	100
	101	tmp[0] = reg;
	102	tmp[1] = data;
	103	rc = i2c_master_send(&th->clt, (const char *)tmp, 2);
	104	if (rc < 0)
	105	return rc;
	106	if (rc != 2)
	107	return -ENODEV;
	108	return 0;
	109	}
	110
	111	static int
	112	read_reg(struct thermostat* th, int reg)
	113	{
	114	u8 reg_addr, data;
	115	int rc;
	116
	117	reg_addr = (u8)reg;
	118	rc = i2c_master_send(&th->clt, &reg_addr, 1);
	119	if (rc < 0)
	120	return rc;
	121	if (rc != 1)
	122	return -ENODEV;
	123	rc = i2c_master_recv(&th->clt, (char *)&data, 1);
	124	if (rc < 0)
	125	return rc;
	126	return data;
	127	}
	128
	129	static int
	130	attach_thermostat(struct i2c_adapter *adapter)
	131	{
	132	unsigned long bus_no;
	133
	134	if (strncmp(adapter->name, "uni-n", 5))
	135	return -ENODEV;
	136	bus_no = simple_strtoul(adapter->name + 6, NULL, 10);
137	if (bus_no != therm_bus)
138	return -ENODEV;
139	return attach_one_thermostat(adapter, therm_address, bus_no);
140	}
141
142	static int
143	detach_thermostat(struct i2c_adapter *adapter)
144	{
145	struct thermostat* th;
146	int i;
147
148	if (thermostat == NULL)
149	return 0;
150
151	th = thermostat;
152
153	if (thread_therm != NULL) {
154	kthread_stop(thread_therm);
155	}
9f6d4b0c	156
1da177e4 LT	157	printk(KERN_INFO "adt746x: Putting max temperatures back from "
	158	"%d, %d, %d to %d, %d, %d\n",
	159	th->limits[0], th->limits[1], th->limits[2],
	160	th->initial_limits[0], th->initial_limits[1],
	161	th->initial_limits[2]);
9f6d4b0c	162
1da177e4 LT	163	for (i = 0; i < 3; i++)
	164	write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
	165
	166	write_both_fan_speed(th, -1);
	167
	168	i2c_detach_client(&th->clt);
	169
	170	thermostat = NULL;
	171
	172	kfree(th);
	173
	174	return 0;
	175	}
	176
	177	static struct i2c_driver thermostat_driver = {
a33ca232	178	.driver = {
a33ca232 LR	179	.name = "therm_adt746x",
a33ca232 LR	180	},
1da177e4 LT	181	.attach_adapter = attach_thermostat,
	182	.detach_adapter = detach_thermostat,
	183	};
	184
	185	static int read_fan_speed(struct thermostat *th, u8 addr)
	186	{
	187	u8 tmp[2];
	188	u16 res;
	189
	190	/* should start with low byte */
	191	tmp[1] = read_reg(th, addr);
	192	tmp[0] = read_reg(th, addr + 1);
	193
	194	res = tmp[1] + (tmp[0] << 8);
	195	/* "a value of 0xffff means that the fan has stopped" */
	196	return (res == 0xffff ? 0 : (90000*60)/res);
	197	}
	198
	199	static void write_both_fan_speed(struct thermostat *th, int speed)
	200	{
	201	write_fan_speed(th, speed, 0);
	202	if (therm_type == ADT7460)
	203	write_fan_speed(th, speed, 1);
	204	}
	205
	206	static void write_fan_speed(struct thermostat *th, int speed, int fan)
	207	{
	208	u8 manual;
	209
	210	if (speed > 0xff)
	211	speed = 0xff;
	212	else if (speed < -1)
	213	speed = 0;
	214
	215	if (therm_type == ADT7467 && fan == 1)
	216	return;
	217
	218	if (th->last_speed[fan] != speed) {
9f6d4b0c BC	219	if (verbose) {
	220	if (speed == -1)
	221	printk(KERN_DEBUG "adt746x: Setting speed to automatic "
	222	"for %s fan.\n", sensor_location[fan+1]);
	223	else
	224	printk(KERN_DEBUG "adt746x: Setting speed to %d "
	225	"for %s fan.\n", speed, sensor_location[fan+1]);
	226	}
1da177e4 LT	227	} else
	228	return;
	229
	230	if (speed >= 0) {
	231	manual = read_reg(th, MANUAL_MODE[fan]);
	232	write_reg(th, MANUAL_MODE[fan], manual\|MANUAL_MASK);
	233	write_reg(th, FAN_SPD_SET[fan], speed);
	234	} else {
	235	/* back to automatic */
	236	if(therm_type == ADT7460) {
	237	manual = read_reg(th,
	238	MANUAL_MODE[fan]) & (~MANUAL_MASK);
	239
	240	write_reg(th,
	241	MANUAL_MODE[fan], manual\|REM_CONTROL[fan]);
	242	} else {
	243	manual = read_reg(th, MANUAL_MODE[fan]);
	244	write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
	245	}
	246	}
	247
	248	th->last_speed[fan] = speed;
	249	}
	250
	251	static void read_sensors(struct thermostat *th)
	252	{
	253	int i = 0;
	254
	255	for (i = 0; i < 3; i++)
	256	th->temps[i] = read_reg(th, TEMP_REG[i]);
	257	}
	258
	259	#ifdef DEBUG
	260	static void display_stats(struct thermostat *th)
	261	{
	262	if (th->temps[0] != th->cached_temp[0]
	263	\|\| th->temps[1] != th->cached_temp[1]
	264	\|\| th->temps[2] != th->cached_temp[2]) {
	265	printk(KERN_INFO "adt746x: Temperature infos:"
	266	" thermostats: %d,%d,%d;"
	267	" limits: %d,%d,%d;"
	268	" fan speed: %d RPM\n",
	269	th->temps[0], th->temps[1], th->temps[2],
	270	th->limits[0], th->limits[1], th->limits[2],
	271	read_fan_speed(th, FAN_SPEED[0]));
	272	}
	273	th->cached_temp[0] = th->temps[0];
	274	th->cached_temp[1] = th->temps[1];
	275	th->cached_temp[2] = th->temps[2];
	276	}
	277	#endif
	278
	279	static void update_fans_speed (struct thermostat *th)
	280	{
	281	int lastvar = 0; /* last variation, for iBook */
	282	int i = 0;
	283
	284	/* we don't care about local sensor, so we start at sensor 1 */
	285	for (i = 1; i < 3; i++) {
	286	int started = 0;
	287	int fan_number = (therm_type == ADT7460 && i == 2);
	288	int var = th->temps[i] - th->limits[i];
	289
	290	if (var > -1) {
291	int step = (255 - fan_speed) / 7;
292	int new_speed = 0;
293
294	/* hysteresis : change fan speed only if variation is
295	* more than two degrees */
296	if (abs(var - th->last_var[fan_number]) < 2)
297	continue;
298
299	started = 1;
300	new_speed = fan_speed + ((var-1)*step);
301
302	if (new_speed < fan_speed)
303	new_speed = fan_speed;
304	if (new_speed > 255)
305	new_speed = 255;
306
9f6d4b0c BC	307	if (verbose)
	308	printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
	309	"(limit exceeded by %d on %s) \n",
	310	new_speed, var,
	311	sensor_location[fan_number+1]);
1da177e4 LT	312	write_both_fan_speed(th, new_speed);
	313	th->last_var[fan_number] = var;
	314	} else if (var < -2) {
d20c507f	315	/* don't stop fan if sensor2 is cold and sensor1 is not
1da177e4 LT	316	* so cold (lastvar >= -1) */
	317	if (i == 2 && lastvar < -1) {
	318	if (th->last_speed[fan_number] != 0)
9f6d4b0c BC	319	if (verbose)
	320	printk(KERN_DEBUG "adt746x: Stopping "
	321	"fans.\n");
1da177e4 LT	322	write_both_fan_speed(th, 0);
	323	}
	324	}
	325
	326	lastvar = var;
	327
	328	if (started)
	329	return; /* we don't want to re-stop the fan
d20c507f	330	* if sensor1 is heating and sensor2 is not */
1da177e4 LT	331	}
	332	}
	333
	334	static int monitor_task(void *arg)
	335	{
	336	struct thermostat* th = arg;
	337
83144186	338	set_freezable();
1da177e4	339	while(!kthread_should_stop()) {
3e1d1d28	340	try_to_freeze();
1da177e4 LT	341	msleep_interruptible(2000);
	342
	343	#ifndef DEBUG
	344	if (fan_speed != -1)
	345	read_sensors(th);
	346	#else
	347	read_sensors(th);
	348	#endif
	349
	350	if (fan_speed != -1)
	351	update_fans_speed(th);
	352
	353	#ifdef DEBUG
	354	display_stats(th);
	355	#endif
	356
	357	}
	358
	359	return 0;
	360	}
	361
	362	static void set_limit(struct thermostat *th, int i)
	363	{
d20c507f	364	/* Set sensor1 limit higher to avoid powerdowns */
1da177e4 LT	365	th->limits[i] = default_limits_chip[i] + limit_adjust;
	366	write_reg(th, LIMIT_REG[i], th->limits[i]);
	367
	368	/* set our limits to normal */
	369	th->limits[i] = default_limits_local[i] + limit_adjust;
	370	}
	371
	372	static int attach_one_thermostat(struct i2c_adapter *adapter, int addr,
	373	int busno)
	374	{
	375	struct thermostat* th;
	376	int rc;
	377	int i;
	378
	379	if (thermostat)
	380	return 0;
	381
cc61f957	382	th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
1da177e4 LT	383	if (!th)
	384	return -ENOMEM;
	385
1da177e4 LT	386	th->clt.addr = addr;
	387	th->clt.adapter = adapter;
	388	th->clt.driver = &thermostat_driver;
	389	strcpy(th->clt.name, "thermostat");
	390
	391	rc = read_reg(th, 0);
	392	if (rc < 0) {
	393	printk(KERN_ERR "adt746x: Thermostat failed to read config "
	394	"from bus %d !\n",
	395	busno);
	396	kfree(th);
	397	return -ENODEV;
	398	}
	399
	400	/* force manual control to start the fan quieter */
	401	if (fan_speed == -1)
	402	fan_speed = 64;
	403
	404	if(therm_type == ADT7460) {
	405	printk(KERN_INFO "adt746x: ADT7460 initializing\n");
	406	/* The 7460 needs to be started explicitly */
	407	write_reg(th, CONFIG_REG, 1);
	408	} else
	409	printk(KERN_INFO "adt746x: ADT7467 initializing\n");
	410
	411	for (i = 0; i < 3; i++) {
	412	th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
	413	set_limit(th, i);
	414	}
9f6d4b0c	415
1da177e4 LT	416	printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
	417	" to %d, %d, %d\n",
	418	th->initial_limits[0], th->initial_limits[1],
	419	th->initial_limits[2], th->limits[0], th->limits[1],
	420	th->limits[2]);
	421
	422	thermostat = th;
	423
	424	if (i2c_attach_client(&th->clt)) {
	425	printk(KERN_INFO "adt746x: Thermostat failed to attach "
	426	"client !\n");
	427	thermostat = NULL;
	428	kfree(th);
	429	return -ENODEV;
	430	}
	431
	432	/* be sure to really write fan speed the first time */
	433	th->last_speed[0] = -2;
	434	th->last_speed[1] = -2;
	435	th->last_var[0] = -80;
	436	th->last_var[1] = -80;
	437
	438	if (fan_speed != -1) {
	439	/* manual mode, stop fans */
	440	write_both_fan_speed(th, 0);
	441	} else {
	442	/* automatic mode */
	443	write_both_fan_speed(th, -1);
	444	}
	445
	446	thread_therm = kthread_run(monitor_task, th, "kfand");
	447
	448	if (thread_therm == ERR_PTR(-ENOMEM)) {
	449	printk(KERN_INFO "adt746x: Kthread creation failed\n");
	450	thread_therm = NULL;
	451	return -ENOMEM;
	452	}
	453
	454	return 0;
	455	}
	456
	457	/*
	458	* Now, unfortunately, sysfs doesn't give us a nice void * we could
	459	* pass around to the attribute functions, so we don't really have
	460	* choice but implement a bunch of them...
	461	*
e404e274	462	* FIXME, it does now...
1da177e4 LT	463	*/
1da177e4 LT	464	#define BUILD_SHOW_FUNC_INT(name, data) \
e404e274	465	static ssize_t show_##name(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	466	{ \
	467	return sprintf(buf, "%d\n", data); \
	468	}
	469
d20c507f	470	#define BUILD_SHOW_FUNC_STR(name, data) \
e404e274	471	static ssize_t show_##name(struct device dev, struct device_attribute attr, char *buf) \
d20c507f CL	472	{ \
	473	return sprintf(buf, "%s\n", data); \
	474	}
	475
1da177e4	476	#define BUILD_SHOW_FUNC_FAN(name, data) \
e404e274	477	static ssize_t show_##name(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	478	{ \
	479	return sprintf(buf, "%d (%d rpm)\n", \
	480	thermostat->last_speed[data], \
	481	read_fan_speed(thermostat, FAN_SPEED[data]) \
	482	); \
	483	}
	484
	485	#define BUILD_STORE_FUNC_DEG(name, data) \
e404e274	486	static ssize_t store_##name(struct device dev, struct device_attribute attr, const char *buf, size_t n) \
1da177e4 LT	487	{ \
	488	int val; \
	489	int i; \
	490	val = simple_strtol(buf, NULL, 10); \
d20c507f	491	printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \
1da177e4 LT	492	limit_adjust = val; \
	493	for (i=0; i < 3; i++) \
	494	set_limit(thermostat, i); \
	495	return n; \
	496	}
	497
	498	#define BUILD_STORE_FUNC_INT(name, data) \
e404e274	499	static ssize_t store_##name(struct device dev, struct device_attribute attr, const char *buf, size_t n) \
1da177e4 LT	500	{ \
	501	u32 val; \
	502	val = simple_strtoul(buf, NULL, 10); \
	503	if (val < 0 \|\| val > 255) \
	504	return -EINVAL; \
	505	printk(KERN_INFO "Setting specified fan speed to %d\n", val); \
	506	data = val; \
	507	return n; \
	508	}
	509
d20c507f CL	510	BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(thermostat, TEMP_REG[1])))
	511	BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(thermostat, TEMP_REG[2])))
	512	BUILD_SHOW_FUNC_INT(sensor1_limit, thermostat->limits[1])
	513	BUILD_SHOW_FUNC_INT(sensor2_limit, thermostat->limits[2])
	514	BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1])
	515	BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2])
1da177e4 LT	516
1da177e4 LT	517	BUILD_SHOW_FUNC_INT(specified_fan_speed, fan_speed)
d20c507f CL	518	BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0)
d20c507f CL	519	BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1)
1da177e4 LT	520
	521	BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
	522	BUILD_SHOW_FUNC_INT(limit_adjust, limit_adjust)
	523	BUILD_STORE_FUNC_DEG(limit_adjust, thermostat)
	524
d20c507f CL	525	static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
	526	show_sensor1_temperature,NULL);
	527	static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
	528	show_sensor2_temperature,NULL);
	529	static DEVICE_ATTR(sensor1_limit, S_IRUGO,
	530	show_sensor1_limit, NULL);
	531	static DEVICE_ATTR(sensor2_limit, S_IRUGO,
	532	show_sensor2_limit, NULL);
	533	static DEVICE_ATTR(sensor1_location, S_IRUGO,
	534	show_sensor1_location, NULL);
	535	static DEVICE_ATTR(sensor2_location, S_IRUGO,
	536	show_sensor2_location, NULL);
1da177e4 LT	537
	538	static DEVICE_ATTR(specified_fan_speed, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IROTH,
	539	show_specified_fan_speed,store_specified_fan_speed);
	540
d20c507f CL	541	static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO,
	542	show_sensor1_fan_speed, NULL);
	543	static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO,
	544	show_sensor2_fan_speed, NULL);
1da177e4 LT	545
	546	static DEVICE_ATTR(limit_adjust, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IROTH,
	547	show_limit_adjust, store_limit_adjust);
	548
	549
	550	static int __init
	551	thermostat_init(void)
	552	{
	553	struct device_node* np;
018a3d1d	554	const u32 *prop;
d20c507f	555	int i = 0, offset = 0;
10804f0f	556	int err;
1da177e4 LT	557
	558	np = of_find_node_by_name(NULL, "fan");
	559	if (!np)
	560	return -ENODEV;
55b61fec	561	if (of_device_is_compatible(np, "adt7460"))
1da177e4	562	therm_type = ADT7460;
55b61fec	563	else if (of_device_is_compatible(np, "adt7467"))
1da177e4	564	therm_type = ADT7467;
958a65f2 JL	565	else {
958a65f2 JL	566	of_node_put(np);
1da177e4	567	return -ENODEV;
958a65f2	568	}
a8bacec0	569
01b2726d	570	prop = of_get_property(np, "hwsensor-params-version", NULL);
a8bacec0 CL	571	printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
a8bacec0 CL	572	(*prop == 1)?"":"un");
958a65f2 JL	573	if (*prop != 1) {
958a65f2 JL	574	of_node_put(np);
a8bacec0	575	return -ENODEV;
958a65f2	576	}
1da177e4	577
01b2726d	578	prop = of_get_property(np, "reg", NULL);
958a65f2 JL	579	if (!prop) {
958a65f2 JL	580	of_node_put(np);
1da177e4	581	return -ENODEV;
958a65f2	582	}
1da177e4 LT	583
	584	/* look for bus either by path or using "reg" */
	585	if (strstr(np->full_name, "/i2c-bus@") != NULL) {
	586	const char *tmp_bus = (strstr(np->full_name, "/i2c-bus@") + 9);
	587	therm_bus = tmp_bus[0]-'0';
	588	} else {
	589	therm_bus = ((*prop) >> 8) & 0x0f;
	590	}
	591
	592	therm_address = ((*prop) & 0xff) >> 1;
	593
	594	printk(KERN_INFO "adt746x: Thermostat bus: %d, address: 0x%02x, "
	595	"limit_adjust: %d, fan_speed: %d\n",
	596	therm_bus, therm_address, limit_adjust, fan_speed);
	597
01b2726d	598	if (of_get_property(np, "hwsensor-location", NULL)) {
d20c507f	599	for (i = 0; i < 3; i++) {
01b2726d	600	sensor_location[i] = of_get_property(np,
d20c507f CL	601	"hwsensor-location", NULL) + offset;
	602
	603	if (sensor_location[i] == NULL)
	604	sensor_location[i] = "";
	605
	606	printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
	607	offset += strlen(sensor_location[i]) + 1;
	608	}
	609	} else {
	610	sensor_location[0] = "?";
	611	sensor_location[1] = "?";
	612	sensor_location[2] = "?";
	613	}
	614
0365ba7f	615	of_dev = of_platform_device_create(np, "temperatures", NULL);
1da177e4 LT	616
	617	if (of_dev == NULL) {
	618	printk(KERN_ERR "Can't register temperatures device !\n");
958a65f2	619	of_node_put(np);
1da177e4 LT	620	return -ENODEV;
	621	}
	622
10804f0f SR	623	err = device_create_file(&of_dev->dev, &dev_attr_sensor1_temperature);
	624	err \|= device_create_file(&of_dev->dev, &dev_attr_sensor2_temperature);
	625	err \|= device_create_file(&of_dev->dev, &dev_attr_sensor1_limit);
	626	err \|= device_create_file(&of_dev->dev, &dev_attr_sensor2_limit);
	627	err \|= device_create_file(&of_dev->dev, &dev_attr_sensor1_location);
	628	err \|= device_create_file(&of_dev->dev, &dev_attr_sensor2_location);
	629	err \|= device_create_file(&of_dev->dev, &dev_attr_limit_adjust);
	630	err \|= device_create_file(&of_dev->dev, &dev_attr_specified_fan_speed);
	631	err \|= device_create_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
1da177e4	632	if(therm_type == ADT7460)
10804f0f SR	633	err \|= device_create_file(&of_dev->dev, &dev_attr_sensor2_fan_speed);
	634	if (err)
	635	printk(KERN_WARNING
	636	"Failed to create tempertaure attribute file(s).\n");
1da177e4	637
4d6c5889 BH	638	#ifndef CONFIG_I2C_POWERMAC
4d6c5889 BH	639	request_module("i2c-powermac");
1da177e4 LT	640	#endif
	641
	642	return i2c_add_driver(&thermostat_driver);
	643	}
	644
	645	static void __exit
	646	thermostat_exit(void)
	647	{
	648	if (of_dev) {
d20c507f CL	649	device_remove_file(&of_dev->dev, &dev_attr_sensor1_temperature);
	650	device_remove_file(&of_dev->dev, &dev_attr_sensor2_temperature);
	651	device_remove_file(&of_dev->dev, &dev_attr_sensor1_limit);
	652	device_remove_file(&of_dev->dev, &dev_attr_sensor2_limit);
	653	device_remove_file(&of_dev->dev, &dev_attr_sensor1_location);
	654	device_remove_file(&of_dev->dev, &dev_attr_sensor2_location);
1da177e4 LT	655	device_remove_file(&of_dev->dev, &dev_attr_limit_adjust);
1da177e4 LT	656	device_remove_file(&of_dev->dev, &dev_attr_specified_fan_speed);
d20c507f	657	device_remove_file(&of_dev->dev, &dev_attr_sensor1_fan_speed);
1da177e4 LT	658
	659	if(therm_type == ADT7460)
	660	device_remove_file(&of_dev->dev,
d20c507f	661	&dev_attr_sensor2_fan_speed);
1da177e4 LT	662
	663	of_device_unregister(of_dev);
	664	}
	665	i2c_del_driver(&thermostat_driver);
	666	}
	667
	668	module_init(thermostat_init);
	669	module_exit(thermostat_exit);