[GitHub/mt8127/android_kernel_alcatel_ttab.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 115254175ADT7467_pra.pdf and 3686221171167ADT7460_b.pdf
 * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7467
 * http://www.onsemi.com/PowerSolutions/product.do?id=ADT7460
 *
 */

#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 <linux/of_platform.h>

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

#undef DEBUG

#define CONFIG_REG   0x40
#define MANUAL_MASK  0xe0
#define AUTO_MASK    0x20
#define INVERT_MASK  0x10

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 bool 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];
	int			pwm_inv[2];
	struct task_struct	*thread;
	struct platform_device	*pdev;
	enum {
		ADT7460,
		ADT7467
	}			type;
};

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 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 (th->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 (th->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]);
		manual &= ~INVERT_MASK;
		write_reg(th, MANUAL_MODE[fan],
			manual | MANUAL_MASK | th->pwm_inv[fan]);
		write_reg(th, FAN_SPD_SET[fan], speed);
	} else {
		/* back to automatic */
		if(th->type == ADT7460) {
			manual = read_reg(th,
				MANUAL_MODE[fan]) & (~MANUAL_MASK);
			manual &= ~INVERT_MASK;
			manual |= th->pwm_inv[fan];
			write_reg(th,
				MANUAL_MODE[fan], manual|REM_CONTROL[fan]);
		} else {
			manual = read_reg(th, MANUAL_MODE[fan]);
			manual &= ~INVERT_MASK;
			manual |= th->pwm_inv[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 = (th->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;
}

#define BUILD_SHOW_FUNC_INT(name, data)				\
static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf)	\
{								\
	struct thermostat *th = dev_get_drvdata(dev);		\
	return sprintf(buf, "%d\n", data);			\
}

#define BUILD_SHOW_FUNC_INT_LITE(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)       \
{								\
	struct thermostat *th = dev_get_drvdata(dev);		\
	return sprintf(buf, "%d (%d rpm)\n", 			\
		th->last_speed[data],				\
		read_fan_speed(th, 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) \
{								\
	struct thermostat *th = dev_get_drvdata(dev);		\
	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(th, 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) \
{								\
	int val;						\
	val = simple_strtol(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(th, TEMP_REG[1])))
BUILD_SHOW_FUNC_INT(sensor2_temperature,	 (read_reg(th, TEMP_REG[2])))
BUILD_SHOW_FUNC_INT(sensor1_limit,		 th->limits[1])
BUILD_SHOW_FUNC_INT(sensor2_limit,		 th->limits[2])
BUILD_SHOW_FUNC_STR(sensor1_location,		 sensor_location[1])
BUILD_SHOW_FUNC_STR(sensor2_location,		 sensor_location[2])

BUILD_SHOW_FUNC_INT_LITE(specified_fan_speed, fan_speed)
BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)

BUILD_SHOW_FUNC_FAN(sensor1_fan_speed,	 0)
BUILD_SHOW_FUNC_FAN(sensor2_fan_speed,	 1)

BUILD_SHOW_FUNC_INT_LITE(limit_adjust,	 limit_adjust)
BUILD_STORE_FUNC_DEG(limit_adjust,	 th)
		
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 void thermostat_create_files(struct thermostat *th)
{
	struct device_node *np = th->clt->dev.of_node;
	struct device *dev;
	int err;

	/* To maintain ABI compatibility with userspace, create
	 * the old style platform driver and attach the attributes
	 * to it here
	 */
	th->pdev = of_platform_device_create(np, "temperatures", NULL);
	if (!th->pdev)
		return;
	dev = &th->pdev->dev;
	dev_set_drvdata(dev, th);
	err = device_create_file(dev, &dev_attr_sensor1_temperature);
	err |= device_create_file(dev, &dev_attr_sensor2_temperature);
	err |= device_create_file(dev, &dev_attr_sensor1_limit);
	err |= device_create_file(dev, &dev_attr_sensor2_limit);
	err |= device_create_file(dev, &dev_attr_sensor1_location);
	err |= device_create_file(dev, &dev_attr_sensor2_location);
	err |= device_create_file(dev, &dev_attr_limit_adjust);
	err |= device_create_file(dev, &dev_attr_specified_fan_speed);
	err |= device_create_file(dev, &dev_attr_sensor1_fan_speed);
	if(th->type == ADT7460)
		err |= device_create_file(dev, &dev_attr_sensor2_fan_speed);
	if (err)
		printk(KERN_WARNING
			"Failed to create temperature attribute file(s).\n");
}

static void thermostat_remove_files(struct thermostat *th)
{
	struct device *dev;

	if (!th->pdev)
		return;
	dev = &th->pdev->dev;
	device_remove_file(dev, &dev_attr_sensor1_temperature);
	device_remove_file(dev, &dev_attr_sensor2_temperature);
	device_remove_file(dev, &dev_attr_sensor1_limit);
	device_remove_file(dev, &dev_attr_sensor2_limit);
	device_remove_file(dev, &dev_attr_sensor1_location);
	device_remove_file(dev, &dev_attr_sensor2_location);
	device_remove_file(dev, &dev_attr_limit_adjust);
	device_remove_file(dev, &dev_attr_specified_fan_speed);
	device_remove_file(dev, &dev_attr_sensor1_fan_speed);	
	if (th->type == ADT7460)
		device_remove_file(dev, &dev_attr_sensor2_fan_speed);
	of_device_unregister(th->pdev);

}

static int probe_thermostat(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct device_node *np = client->dev.of_node;
	struct thermostat* th;
	const __be32 *prop;
	int i, rc, vers, offset = 0;

	if (!np)
		return -ENXIO;
	prop = of_get_property(np, "hwsensor-params-version", NULL);
	if (!prop)
		return -ENXIO;
	vers = be32_to_cpup(prop);
	printk(KERN_INFO "adt746x: version %d (%ssupported)\n",
	       vers, vers == 1 ? "" : "un");
	if (vers != 1)
		return -ENXIO;

	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;
		}
	}

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

	i2c_set_clientdata(client, th);
	th->clt = client;
	th->type = id->driver_data;

	rc = read_reg(th, CONFIG_REG);
	if (rc < 0) {
		dev_err(&client->dev, "Thermostat failed to read config!\n");
		kfree(th);
		return -ENODEV;
	}

	/* force manual control to start the fan quieter */
	if (fan_speed == -1)
		fan_speed = 64;
	
	if (th->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]);

	/* record invert bit status because fw can corrupt it after suspend */
	th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
	th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;

	/* 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);
	}
	
	th->thread = kthread_run(monitor_task, th, "kfand");
	if (th->thread == ERR_PTR(-ENOMEM)) {
		printk(KERN_INFO "adt746x: Kthread creation failed\n");
		th->thread = NULL;
		return -ENOMEM;
	}

	thermostat_create_files(th);

	return 0;
}

static int remove_thermostat(struct i2c_client *client)
{
	struct thermostat *th = i2c_get_clientdata(client);
	int i;
	
	thermostat_remove_files(th);

	if (th->thread != NULL)
		kthread_stop(th->thread);

	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);

	kfree(th);

	return 0;
}

static const struct i2c_device_id therm_adt746x_id[] = {
	{ "MAC,adt7460", ADT7460 },
	{ "MAC,adt7467", ADT7467 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, therm_adt746x_id);

static struct i2c_driver thermostat_driver = {
	.driver = {
		.name	= "therm_adt746x",
	},
	.probe = probe_thermostat,
	.remove = remove_thermostat,
	.id_table = therm_adt746x_id,
};

static int __init thermostat_init(void)
{
#ifndef CONFIG_I2C_POWERMAC
	request_module("i2c-powermac");
#endif

	return i2c_add_driver(&thermostat_driver);
}

static void __exit thermostat_exit(void)
{
	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	*
631dd1a8 JM	6	* Documentation from 115254175ADT7467_pra.pdf and 3686221171167ADT7460_b.pdf
	7	* http://www.onsemi.com/PowerSolutions/product.do?id=ADT7467
	8	* http://www.onsemi.com/PowerSolutions/product.do?id=ADT7460
1da177e4 LT	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>
ad9e05ae	27	#include <linux/of_platform.h>
1da177e4 LT	28
	29	#include <asm/prom.h>
	30	#include <asm/machdep.h>
	31	#include <asm/io.h>
1da177e4	32	#include <asm/sections.h>
1da177e4 LT	33
	34	#undef DEBUG
	35
	36	#define CONFIG_REG 0x40
	37	#define MANUAL_MASK 0xe0
	38	#define AUTO_MASK 0x20
0512a9a8	39	#define INVERT_MASK 0x10
1da177e4	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 */
7a4b15cd	50	static const char *sensor_location[3] = { "?", "?", "?" };
1da177e4	51
87275856	52	static int limit_adjust;
1da177e4	53	static int fan_speed = -1;
90ab5ee9	54	static bool 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	73	struct thermostat {
2e613e7f	74	struct i2c_client *clt;
1da177e4 LT	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];
1496e89a	81	int pwm_inv[2];
7a4b15cd BH	82	struct task_struct *thread;
	83	struct platform_device *pdev;
	84	enum {
	85	ADT7460,
	86	ADT7467
	87	} type;
1da177e4 LT	88	};
1da177e4 LT	89
1da177e4 LT	90	static void write_both_fan_speed(struct thermostat *th, int speed);
	91	static void write_fan_speed(struct thermostat *th, int speed, int fan);
	92
	93	static int
	94	write_reg(struct thermostat* th, int reg, u8 data)
	95	{
	96	u8 tmp[2];
	97	int rc;
	98
	99	tmp[0] = reg;
	100	tmp[1] = data;
2e613e7f	101	rc = i2c_master_send(th->clt, (const char *)tmp, 2);
1da177e4 LT	102	if (rc < 0)
	103	return rc;
	104	if (rc != 2)
	105	return -ENODEV;
	106	return 0;
	107	}
	108
	109	static int
	110	read_reg(struct thermostat* th, int reg)
	111	{
	112	u8 reg_addr, data;
	113	int rc;
	114
	115	reg_addr = (u8)reg;
2e613e7f	116	rc = i2c_master_send(th->clt, &reg_addr, 1);
1da177e4 LT	117	if (rc < 0)
	118	return rc;
	119	if (rc != 1)
	120	return -ENODEV;
2e613e7f	121	rc = i2c_master_recv(th->clt, (char *)&data, 1);
1da177e4 LT	122	if (rc < 0)
	123	return rc;
	124	return data;
	125	}
	126
1da177e4 LT	127	static int read_fan_speed(struct thermostat *th, u8 addr)
	128	{
	129	u8 tmp[2];
	130	u16 res;
	131
	132	/* should start with low byte */
	133	tmp[1] = read_reg(th, addr);
	134	tmp[0] = read_reg(th, addr + 1);
	135
	136	res = tmp[1] + (tmp[0] << 8);
	137	/* "a value of 0xffff means that the fan has stopped" */
	138	return (res == 0xffff ? 0 : (90000*60)/res);
	139	}
	140
	141	static void write_both_fan_speed(struct thermostat *th, int speed)
	142	{
	143	write_fan_speed(th, speed, 0);
7a4b15cd	144	if (th->type == ADT7460)
1da177e4 LT	145	write_fan_speed(th, speed, 1);
	146	}
	147
	148	static void write_fan_speed(struct thermostat *th, int speed, int fan)
	149	{
	150	u8 manual;
	151
	152	if (speed > 0xff)
	153	speed = 0xff;
	154	else if (speed < -1)
	155	speed = 0;
	156
7a4b15cd	157	if (th->type == ADT7467 && fan == 1)
1da177e4 LT	158	return;
	159
	160	if (th->last_speed[fan] != speed) {
9f6d4b0c BC	161	if (verbose) {
	162	if (speed == -1)
	163	printk(KERN_DEBUG "adt746x: Setting speed to automatic "
	164	"for %s fan.\n", sensor_location[fan+1]);
	165	else
	166	printk(KERN_DEBUG "adt746x: Setting speed to %d "
	167	"for %s fan.\n", speed, sensor_location[fan+1]);
	168	}
1da177e4 LT	169	} else
	170	return;
	171
	172	if (speed >= 0) {
	173	manual = read_reg(th, MANUAL_MODE[fan]);
1496e89a	174	manual &= ~INVERT_MASK;
0512a9a8	175	write_reg(th, MANUAL_MODE[fan],
1496e89a	176	manual \| MANUAL_MASK \| th->pwm_inv[fan]);
1da177e4 LT	177	write_reg(th, FAN_SPD_SET[fan], speed);
	178	} else {
	179	/* back to automatic */
7a4b15cd	180	if(th->type == ADT7460) {
1da177e4 LT	181	manual = read_reg(th,
1da177e4 LT	182	MANUAL_MODE[fan]) & (~MANUAL_MASK);
1496e89a DW	183	manual &= ~INVERT_MASK;
1496e89a DW	184	manual \|= th->pwm_inv[fan];
1da177e4 LT	185	write_reg(th,
	186	MANUAL_MODE[fan], manual\|REM_CONTROL[fan]);
	187	} else {
	188	manual = read_reg(th, MANUAL_MODE[fan]);
1496e89a DW	189	manual &= ~INVERT_MASK;
1496e89a DW	190	manual \|= th->pwm_inv[fan];
1da177e4 LT	191	write_reg(th, MANUAL_MODE[fan], manual&(~AUTO_MASK));
	192	}
	193	}
	194
	195	th->last_speed[fan] = speed;
	196	}
	197
	198	static void read_sensors(struct thermostat *th)
	199	{
	200	int i = 0;
	201
	202	for (i = 0; i < 3; i++)
	203	th->temps[i] = read_reg(th, TEMP_REG[i]);
	204	}
	205
	206	#ifdef DEBUG
	207	static void display_stats(struct thermostat *th)
	208	{
	209	if (th->temps[0] != th->cached_temp[0]
	210	\|\| th->temps[1] != th->cached_temp[1]
	211	\|\| th->temps[2] != th->cached_temp[2]) {
	212	printk(KERN_INFO "adt746x: Temperature infos:"
	213	" thermostats: %d,%d,%d;"
	214	" limits: %d,%d,%d;"
	215	" fan speed: %d RPM\n",
	216	th->temps[0], th->temps[1], th->temps[2],
	217	th->limits[0], th->limits[1], th->limits[2],
	218	read_fan_speed(th, FAN_SPEED[0]));
	219	}
	220	th->cached_temp[0] = th->temps[0];
	221	th->cached_temp[1] = th->temps[1];
	222	th->cached_temp[2] = th->temps[2];
	223	}
	224	#endif
	225
	226	static void update_fans_speed (struct thermostat *th)
	227	{
	228	int lastvar = 0; /* last variation, for iBook */
	229	int i = 0;
	230
	231	/* we don't care about local sensor, so we start at sensor 1 */
	232	for (i = 1; i < 3; i++) {
	233	int started = 0;
7a4b15cd	234	int fan_number = (th->type == ADT7460 && i == 2);
1da177e4 LT	235	int var = th->temps[i] - th->limits[i];
	236
	237	if (var > -1) {
	238	int step = (255 - fan_speed) / 7;
	239	int new_speed = 0;
	240
	241	/* hysteresis : change fan speed only if variation is
	242	* more than two degrees */
	243	if (abs(var - th->last_var[fan_number]) < 2)
	244	continue;
	245
	246	started = 1;
	247	new_speed = fan_speed + ((var-1)*step);
	248
	249	if (new_speed < fan_speed)
	250	new_speed = fan_speed;
	251	if (new_speed > 255)
	252	new_speed = 255;
	253
9f6d4b0c BC	254	if (verbose)
9f6d4b0c BC	255	printk(KERN_DEBUG "adt746x: Setting fans speed to %d "
8354be9c	256	"(limit exceeded by %d on %s)\n",
9f6d4b0c BC	257	new_speed, var,
9f6d4b0c BC	258	sensor_location[fan_number+1]);
1da177e4 LT	259	write_both_fan_speed(th, new_speed);
	260	th->last_var[fan_number] = var;
	261	} else if (var < -2) {
d20c507f	262	/* don't stop fan if sensor2 is cold and sensor1 is not
1da177e4 LT	263	* so cold (lastvar >= -1) */
	264	if (i == 2 && lastvar < -1) {
	265	if (th->last_speed[fan_number] != 0)
9f6d4b0c BC	266	if (verbose)
	267	printk(KERN_DEBUG "adt746x: Stopping "
	268	"fans.\n");
1da177e4 LT	269	write_both_fan_speed(th, 0);
	270	}
	271	}
	272
	273	lastvar = var;
	274
	275	if (started)
	276	return; /* we don't want to re-stop the fan
d20c507f	277	* if sensor1 is heating and sensor2 is not */
1da177e4 LT	278	}
	279	}
	280
	281	static int monitor_task(void *arg)
	282	{
	283	struct thermostat* th = arg;
	284
83144186	285	set_freezable();
1da177e4	286	while(!kthread_should_stop()) {
3e1d1d28	287	try_to_freeze();
1da177e4 LT	288	msleep_interruptible(2000);
	289
	290	#ifndef DEBUG
	291	if (fan_speed != -1)
	292	read_sensors(th);
	293	#else
	294	read_sensors(th);
	295	#endif
	296
	297	if (fan_speed != -1)
	298	update_fans_speed(th);
	299
	300	#ifdef DEBUG
	301	display_stats(th);
	302	#endif
	303
	304	}
	305
	306	return 0;
	307	}
	308
	309	static void set_limit(struct thermostat *th, int i)
	310	{
7a4b15cd BH	311	/* Set sensor1 limit higher to avoid powerdowns */
	312	th->limits[i] = default_limits_chip[i] + limit_adjust;
	313	write_reg(th, LIMIT_REG[i], th->limits[i]);
1da177e4	314
7a4b15cd BH	315	/* set our limits to normal */
7a4b15cd BH	316	th->limits[i] = default_limits_local[i] + limit_adjust;
1da177e4 LT	317	}
1da177e4 LT	318
7a4b15cd BH	319	#define BUILD_SHOW_FUNC_INT(name, data) \
	320	static ssize_t show_##name(struct device dev, struct device_attribute attr, char *buf) \
	321	{ \
	322	struct thermostat *th = dev_get_drvdata(dev); \
	323	return sprintf(buf, "%d\n", data); \
1da177e4 LT	324	}
1da177e4 LT	325
7a4b15cd	326	#define BUILD_SHOW_FUNC_INT_LITE(name, data) \
e404e274	327	static ssize_t show_##name(struct device dev, struct device_attribute attr, char *buf) \
1da177e4 LT	328	{ \
	329	return sprintf(buf, "%d\n", data); \
	330	}
	331
d20c507f	332	#define BUILD_SHOW_FUNC_STR(name, data) \
e404e274	333	static ssize_t show_##name(struct device dev, struct device_attribute attr, char *buf) \
d20c507f CL	334	{ \
	335	return sprintf(buf, "%s\n", data); \
	336	}
	337
1da177e4	338	#define BUILD_SHOW_FUNC_FAN(name, data) \
e404e274	339	static ssize_t show_##name(struct device dev, struct device_attribute attr, char *buf) \
1da177e4	340	{ \
7a4b15cd	341	struct thermostat *th = dev_get_drvdata(dev); \
1da177e4	342	return sprintf(buf, "%d (%d rpm)\n", \
7a4b15cd BH	343	th->last_speed[data], \
7a4b15cd BH	344	read_fan_speed(th, FAN_SPEED[data]) \
1da177e4 LT	345	); \
	346	}
	347
	348	#define BUILD_STORE_FUNC_DEG(name, data) \
e404e274	349	static ssize_t store_##name(struct device dev, struct device_attribute attr, const char *buf, size_t n) \
1da177e4	350	{ \
7a4b15cd	351	struct thermostat *th = dev_get_drvdata(dev); \
1da177e4 LT	352	int val; \
	353	int i; \
	354	val = simple_strtol(buf, NULL, 10); \
d20c507f	355	printk(KERN_INFO "Adjusting limits by %d degrees\n", val); \
1da177e4 LT	356	limit_adjust = val; \
1da177e4 LT	357	for (i=0; i < 3; i++) \
7a4b15cd	358	set_limit(th, i); \
1da177e4 LT	359	return n; \
	360	}
	361
	362	#define BUILD_STORE_FUNC_INT(name, data) \
e404e274	363	static ssize_t store_##name(struct device dev, struct device_attribute attr, const char *buf, size_t n) \
1da177e4	364	{ \
2e74778c	365	int val; \
2e74778c	366	val = simple_strtol(buf, NULL, 10); \
1da177e4 LT	367	if (val < 0 \|\| val > 255) \
	368	return -EINVAL; \
	369	printk(KERN_INFO "Setting specified fan speed to %d\n", val); \
	370	data = val; \
	371	return n; \
	372	}
	373
7a4b15cd BH	374	BUILD_SHOW_FUNC_INT(sensor1_temperature, (read_reg(th, TEMP_REG[1])))
	375	BUILD_SHOW_FUNC_INT(sensor2_temperature, (read_reg(th, TEMP_REG[2])))
	376	BUILD_SHOW_FUNC_INT(sensor1_limit, th->limits[1])
	377	BUILD_SHOW_FUNC_INT(sensor2_limit, th->limits[2])
d20c507f CL	378	BUILD_SHOW_FUNC_STR(sensor1_location, sensor_location[1])
d20c507f CL	379	BUILD_SHOW_FUNC_STR(sensor2_location, sensor_location[2])
1da177e4	380
7a4b15cd BH	381	BUILD_SHOW_FUNC_INT_LITE(specified_fan_speed, fan_speed)
	382	BUILD_STORE_FUNC_INT(specified_fan_speed,fan_speed)
	383
d20c507f CL	384	BUILD_SHOW_FUNC_FAN(sensor1_fan_speed, 0)
d20c507f CL	385	BUILD_SHOW_FUNC_FAN(sensor2_fan_speed, 1)
1da177e4	386
7a4b15cd BH	387	BUILD_SHOW_FUNC_INT_LITE(limit_adjust, limit_adjust)
7a4b15cd BH	388	BUILD_STORE_FUNC_DEG(limit_adjust, th)
1da177e4	389
d20c507f CL	390	static DEVICE_ATTR(sensor1_temperature, S_IRUGO,
	391	show_sensor1_temperature,NULL);
	392	static DEVICE_ATTR(sensor2_temperature, S_IRUGO,
	393	show_sensor2_temperature,NULL);
	394	static DEVICE_ATTR(sensor1_limit, S_IRUGO,
	395	show_sensor1_limit, NULL);
	396	static DEVICE_ATTR(sensor2_limit, S_IRUGO,
	397	show_sensor2_limit, NULL);
	398	static DEVICE_ATTR(sensor1_location, S_IRUGO,
	399	show_sensor1_location, NULL);
	400	static DEVICE_ATTR(sensor2_location, S_IRUGO,
	401	show_sensor2_location, NULL);
1da177e4 LT	402
	403	static DEVICE_ATTR(specified_fan_speed, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IROTH,
	404	show_specified_fan_speed,store_specified_fan_speed);
	405
d20c507f CL	406	static DEVICE_ATTR(sensor1_fan_speed, S_IRUGO,
	407	show_sensor1_fan_speed, NULL);
	408	static DEVICE_ATTR(sensor2_fan_speed, S_IRUGO,
	409	show_sensor2_fan_speed, NULL);
1da177e4 LT	410
	411	static DEVICE_ATTR(limit_adjust, S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IROTH,
	412	show_limit_adjust, store_limit_adjust);
	413
7a4b15cd	414	static void thermostat_create_files(struct thermostat *th)
1da177e4	415	{
7a4b15cd BH	416	struct device_node *np = th->clt->dev.of_node;
	417	struct device *dev;
	418	int err;
44ea9c80	419
7a4b15cd BH	420	/* To maintain ABI compatibility with userspace, create
	421	* the old style platform driver and attach the attributes
	422	* to it here
	423	*/
	424	th->pdev = of_platform_device_create(np, "temperatures", NULL);
	425	if (!th->pdev)
	426	return;
	427	dev = &th->pdev->dev;
	428	dev_set_drvdata(dev, th);
	429	err = device_create_file(dev, &dev_attr_sensor1_temperature);
	430	err \|= device_create_file(dev, &dev_attr_sensor2_temperature);
	431	err \|= device_create_file(dev, &dev_attr_sensor1_limit);
	432	err \|= device_create_file(dev, &dev_attr_sensor2_limit);
	433	err \|= device_create_file(dev, &dev_attr_sensor1_location);
	434	err \|= device_create_file(dev, &dev_attr_sensor2_location);
	435	err \|= device_create_file(dev, &dev_attr_limit_adjust);
	436	err \|= device_create_file(dev, &dev_attr_specified_fan_speed);
	437	err \|= device_create_file(dev, &dev_attr_sensor1_fan_speed);
	438	if(th->type == ADT7460)
	439	err \|= device_create_file(dev, &dev_attr_sensor2_fan_speed);
	440	if (err)
	441	printk(KERN_WARNING
	442	"Failed to create temperature attribute file(s).\n");
	443	}
a8bacec0	444
7a4b15cd BH	445	static void thermostat_remove_files(struct thermostat *th)
	446	{
	447	struct device *dev;
1da177e4	448
7a4b15cd BH	449	if (!th->pdev)
	450	return;
	451	dev = &th->pdev->dev;
	452	device_remove_file(dev, &dev_attr_sensor1_temperature);
	453	device_remove_file(dev, &dev_attr_sensor2_temperature);
	454	device_remove_file(dev, &dev_attr_sensor1_limit);
	455	device_remove_file(dev, &dev_attr_sensor2_limit);
	456	device_remove_file(dev, &dev_attr_sensor1_location);
	457	device_remove_file(dev, &dev_attr_sensor2_location);
	458	device_remove_file(dev, &dev_attr_limit_adjust);
	459	device_remove_file(dev, &dev_attr_specified_fan_speed);
	460	device_remove_file(dev, &dev_attr_sensor1_fan_speed);
	461	if (th->type == ADT7460)
	462	device_remove_file(dev, &dev_attr_sensor2_fan_speed);
	463	of_device_unregister(th->pdev);
1da177e4	464
7a4b15cd	465	}
1da177e4	466
7a4b15cd BH	467	static int probe_thermostat(struct i2c_client *client,
	468	const struct i2c_device_id *id)
	469	{
	470	struct device_node *np = client->dev.of_node;
	471	struct thermostat* th;
	472	const __be32 *prop;
	473	int i, rc, vers, offset = 0;
1da177e4	474
7a4b15cd BH	475	if (!np)
	476	return -ENXIO;
	477	prop = of_get_property(np, "hwsensor-params-version", NULL);
	478	if (!prop)
	479	return -ENXIO;
	480	vers = be32_to_cpup(prop);
	481	printk(KERN_INFO "adt746x: version %d (%ssupported)\n",
	482	vers, vers == 1 ? "" : "un");
	483	if (vers != 1)
	484	return -ENXIO;
1da177e4	485
01b2726d	486	if (of_get_property(np, "hwsensor-location", NULL)) {
d20c507f	487	for (i = 0; i < 3; i++) {
01b2726d	488	sensor_location[i] = of_get_property(np,
d20c507f CL	489	"hwsensor-location", NULL) + offset;
	490
	491	if (sensor_location[i] == NULL)
	492	sensor_location[i] = "";
	493
	494	printk(KERN_INFO "sensor %d: %s\n", i, sensor_location[i]);
	495	offset += strlen(sensor_location[i]) + 1;
	496	}
d20c507f CL	497	}
d20c507f CL	498
7a4b15cd BH	499	th = kzalloc(sizeof(struct thermostat), GFP_KERNEL);
	500	if (!th)
	501	return -ENOMEM;
	502
	503	i2c_set_clientdata(client, th);
	504	th->clt = client;
	505	th->type = id->driver_data;
44ea9c80	506
7a4b15cd BH	507	rc = read_reg(th, CONFIG_REG);
	508	if (rc < 0) {
	509	dev_err(&client->dev, "Thermostat failed to read config!\n");
	510	kfree(th);
1da177e4 LT	511	return -ENODEV;
1da177e4 LT	512	}
44ea9c80	513
7a4b15cd BH	514	/* force manual control to start the fan quieter */
	515	if (fan_speed == -1)
	516	fan_speed = 64;
	517
	518	if (th->type == ADT7460) {
	519	printk(KERN_INFO "adt746x: ADT7460 initializing\n");
	520	/* The 7460 needs to be started explicitly */
	521	write_reg(th, CONFIG_REG, 1);
	522	} else
	523	printk(KERN_INFO "adt746x: ADT7467 initializing\n");
33a470f6	524
7a4b15cd BH	525	for (i = 0; i < 3; i++) {
	526	th->initial_limits[i] = read_reg(th, LIMIT_REG[i]);
	527	set_limit(th, i);
	528	}
	529
	530	printk(KERN_INFO "adt746x: Lowering max temperatures from %d, %d, %d"
	531	" to %d, %d, %d\n",
	532	th->initial_limits[0], th->initial_limits[1],
	533	th->initial_limits[2], th->limits[0], th->limits[1],
	534	th->limits[2]);
	535
	536	/* record invert bit status because fw can corrupt it after suspend */
	537	th->pwm_inv[0] = read_reg(th, MANUAL_MODE[0]) & INVERT_MASK;
	538	th->pwm_inv[1] = read_reg(th, MANUAL_MODE[1]) & INVERT_MASK;
	539
	540	/* be sure to really write fan speed the first time */
	541	th->last_speed[0] = -2;
	542	th->last_speed[1] = -2;
	543	th->last_var[0] = -80;
	544	th->last_var[1] = -80;
	545
	546	if (fan_speed != -1) {
	547	/* manual mode, stop fans */
	548	write_both_fan_speed(th, 0);
	549	} else {
	550	/* automatic mode */
	551	write_both_fan_speed(th, -1);
	552	}
	553
	554	th->thread = kthread_run(monitor_task, th, "kfand");
	555	if (th->thread == ERR_PTR(-ENOMEM)) {
	556	printk(KERN_INFO "adt746x: Kthread creation failed\n");
	557	th->thread = NULL;
	558	return -ENOMEM;
	559	}
	560
	561	thermostat_create_files(th);
	562
	563	return 0;
33a470f6 JD	564	}
33a470f6 JD	565
7a4b15cd	566	static int remove_thermostat(struct i2c_client *client)
33a470f6	567	{
7a4b15cd BH	568	struct thermostat *th = i2c_get_clientdata(client);
	569	int i;
	570
	571	thermostat_remove_files(th);
33a470f6	572
7a4b15cd BH	573	if (th->thread != NULL)
	574	kthread_stop(th->thread);
	575
	576	printk(KERN_INFO "adt746x: Putting max temperatures back from "
	577	"%d, %d, %d to %d, %d, %d\n",
	578	th->limits[0], th->limits[1], th->limits[2],
	579	th->initial_limits[0], th->initial_limits[1],
	580	th->initial_limits[2]);
	581
	582	for (i = 0; i < 3; i++)
	583	write_reg(th, LIMIT_REG[i], th->initial_limits[i]);
	584
	585	write_both_fan_speed(th, -1);
	586
	587	kfree(th);
	588
	589	return 0;
1da177e4 LT	590	}
1da177e4 LT	591
7a4b15cd BH	592	static const struct i2c_device_id therm_adt746x_id[] = {
	593	{ "MAC,adt7460", ADT7460 },
	594	{ "MAC,adt7467", ADT7467 },
	595	{ }
	596	};
	597	MODULE_DEVICE_TABLE(i2c, therm_adt746x_id);
	598
	599	static struct i2c_driver thermostat_driver = {
	600	.driver = {
	601	.name = "therm_adt746x",
	602	},
	603	.probe = probe_thermostat,
	604	.remove = remove_thermostat,
	605	.id_table = therm_adt746x_id,
	606	};
	607
	608	static int __init thermostat_init(void)
1da177e4	609	{
7a4b15cd BH	610	#ifndef CONFIG_I2C_POWERMAC
	611	request_module("i2c-powermac");
	612	#endif
1da177e4	613
7a4b15cd	614	return i2c_add_driver(&thermostat_driver);
33a470f6 JD	615	}
33a470f6 JD	616
7a4b15cd	617	static void __exit thermostat_exit(void)
33a470f6	618	{
1da177e4 LT	619	i2c_del_driver(&thermostat_driver);
	620	}
	621
	622	module_init(thermostat_init);
	623	module_exit(thermostat_exit);