/*
 *  it87.c - Part of lm_sensors, Linux kernel modules for hardware
 *           monitoring.
 *
 *  The IT8705F is an LPC-based Super I/O part that contains UARTs, a
 *  parallel port, an IR port, a MIDI port, a floppy controller, etc., in
 *  addition to an Environment Controller (Enhanced Hardware Monitor and
 *  Fan Controller)
 *
 *  This driver supports only the Environment Controller in the IT8705F and
 *  similar parts.  The other devices are supported by different drivers.
 *
 *  Supports: IT8705F  Super I/O chip w/LPC interface
 *            IT8712F  Super I/O chip w/LPC interface
 *            IT8716F  Super I/O chip w/LPC interface
 *            IT8718F  Super I/O chip w/LPC interface
 *            IT8720F  Super I/O chip w/LPC interface
 *            IT8721F  Super I/O chip w/LPC interface
 *            IT8726F  Super I/O chip w/LPC interface
 *            IT8758E  Super I/O chip w/LPC interface
 *            Sis950   A clone of the IT8705F
 *
 *  Copyright (C) 2001 Chris Gauthron
 *  Copyright (C) 2005-2010 Jean Delvare <khali@linux-fr.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/string.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/io.h>

#define DRVNAME "it87"

enum chips { it87, it8712, it8716, it8718, it8720, it8721 };

static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

static struct platform_device *pdev;

#define	REG	0x2e	/* The register to read/write */
#define	DEV	0x07	/* Register: Logical device select */
#define	VAL	0x2f	/* The value to read/write */
#define PME	0x04	/* The device with the fan registers in it */

/* The device with the IT8718F/IT8720F VID value in it */
#define GPIO	0x07

#define	DEVID	0x20	/* Register: Device ID */
#define	DEVREV	0x22	/* Register: Device Revision */

static inline int superio_inb(int reg)
{
	outb(reg, REG);
	return inb(VAL);
}

static inline void superio_outb(int reg, int val)
{
	outb(reg, REG);
	outb(val, VAL);
}

static int superio_inw(int reg)
{
	int val;
	outb(reg++, REG);
	val = inb(VAL) << 8;
	outb(reg, REG);
	val |= inb(VAL);
	return val;
}

static inline void superio_select(int ldn)
{
	outb(DEV, REG);
	outb(ldn, VAL);
}

static inline int superio_enter(void)
{
	/*
	 * Try to reserve REG and REG + 1 for exclusive access.
	 */
	if (!request_muxed_region(REG, 2, DRVNAME))
		return -EBUSY;

	outb(0x87, REG);
	outb(0x01, REG);
	outb(0x55, REG);
	outb(0x55, REG);
	return 0;
}

static inline void superio_exit(void)
{
	outb(0x02, REG);
	outb(0x02, VAL);
	release_region(REG, 2);
}

/* Logical device 4 registers */
#define IT8712F_DEVID 0x8712
#define IT8705F_DEVID 0x8705
#define IT8716F_DEVID 0x8716
#define IT8718F_DEVID 0x8718
#define IT8720F_DEVID 0x8720
#define IT8721F_DEVID 0x8721
#define IT8726F_DEVID 0x8726
#define IT87_ACT_REG  0x30
#define IT87_BASE_REG 0x60

/* Logical device 7 registers (IT8712F and later) */
#define IT87_SIO_GPIO3_REG	0x27
#define IT87_SIO_GPIO5_REG	0x29
#define IT87_SIO_PINX2_REG	0x2c	/* Pin selection */
#define IT87_SIO_VID_REG	0xfc	/* VID value */
#define IT87_SIO_BEEP_PIN_REG	0xf6	/* Beep pin mapping */

/* Update battery voltage after every reading if true */
static int update_vbat;

/* Not all BIOSes properly configure the PWM registers */
static int fix_pwm_polarity;

/* Many IT87 constants specified below */

/* Length of ISA address segment */
#define IT87_EXTENT 8

/* Length of ISA address segment for Environmental Controller */
#define IT87_EC_EXTENT 2

/* Offset of EC registers from ISA base address */
#define IT87_EC_OFFSET 5

/* Where are the ISA address/data registers relative to the EC base address */
#define IT87_ADDR_REG_OFFSET 0
#define IT87_DATA_REG_OFFSET 1

/*----- The IT87 registers -----*/

#define IT87_REG_CONFIG        0x00

#define IT87_REG_ALARM1        0x01
#define IT87_REG_ALARM2        0x02
#define IT87_REG_ALARM3        0x03

/* The IT8718F and IT8720F have the VID value in a different register, in
   Super-I/O configuration space. */
#define IT87_REG_VID           0x0a
/* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b
   for fan divisors. Later IT8712F revisions must use 16-bit tachometer
   mode. */
#define IT87_REG_FAN_DIV       0x0b
#define IT87_REG_FAN_16BIT     0x0c

/* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */

static const u8 IT87_REG_FAN[]		= { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
static const u8 IT87_REG_FAN_MIN[]	= { 0x10, 0x11, 0x12, 0x84, 0x86 };
static const u8 IT87_REG_FANX[]		= { 0x18, 0x19, 0x1a, 0x81, 0x83 };
static const u8 IT87_REG_FANX_MIN[]	= { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
#define IT87_REG_FAN_MAIN_CTRL 0x13
#define IT87_REG_FAN_CTL       0x14
#define IT87_REG_PWM(nr)       (0x15 + (nr))
#define IT87_REG_PWM_DUTY(nr)  (0x63 + (nr) * 8)

#define IT87_REG_VIN(nr)       (0x20 + (nr))
#define IT87_REG_TEMP(nr)      (0x29 + (nr))

#define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
#define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
#define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
#define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)

#define IT87_REG_VIN_ENABLE    0x50
#define IT87_REG_TEMP_ENABLE   0x51
#define IT87_REG_BEEP_ENABLE   0x5c

#define IT87_REG_CHIPID        0x58

#define IT87_REG_AUTO_TEMP(nr, i) (0x60 + (nr) * 8 + (i))
#define IT87_REG_AUTO_PWM(nr, i)  (0x65 + (nr) * 8 + (i))


struct it87_sio_data {
	enum chips type;
	/* Values read from Super-I/O config space */
	u8 revision;
	u8 vid_value;
	u8 beep_pin;
	u8 internal;	/* Internal sensors can be labeled */
	/* Features skipped based on config or DMI */
	u8 skip_vid;
	u8 skip_fan;
	u8 skip_pwm;
};

/* For each registered chip, we need to keep some data in memory.
   The structure is dynamically allocated. */
struct it87_data {
	struct device *hwmon_dev;
	enum chips type;
	u8 revision;

	unsigned short addr;
	const char *name;
	struct mutex update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	u16 in_scaled;		/* Internal voltage sensors are scaled */
	u8 in[9];		/* Register value */
	u8 in_max[8];		/* Register value */
	u8 in_min[8];		/* Register value */
	u8 has_fan;		/* Bitfield, fans enabled */
	u16 fan[5];		/* Register values, possibly combined */
	u16 fan_min[5];		/* Register values, possibly combined */
	s8 temp[3];		/* Register value */
	s8 temp_high[3];	/* Register value */
	s8 temp_low[3];		/* Register value */
	u8 sensor;		/* Register value */
	u8 fan_div[3];		/* Register encoding, shifted right */
	u8 vid;			/* Register encoding, combined */
	u8 vrm;
	u32 alarms;		/* Register encoding, combined */
	u8 beeps;		/* Register encoding */
	u8 fan_main_ctrl;	/* Register value */
	u8 fan_ctl;		/* Register value */

	/* The following 3 arrays correspond to the same registers up to
	 * the IT8720F. The meaning of bits 6-0 depends on the value of bit
	 * 7, and we want to preserve settings on mode changes, so we have
	 * to track all values separately.
	 * Starting with the IT8721F, the manual PWM duty cycles are stored
	 * in separate registers (8-bit values), so the separate tracking
	 * is no longer needed, but it is still done to keep the driver
	 * simple. */
	u8 pwm_ctrl[3];		/* Register value */
	u8 pwm_duty[3];		/* Manual PWM value set by user */
	u8 pwm_temp_map[3];	/* PWM to temp. chan. mapping (bits 1-0) */

	/* Automatic fan speed control registers */
	u8 auto_pwm[3][4];	/* [nr][3] is hard-coded */
	s8 auto_temp[3][5];	/* [nr][0] is point1_temp_hyst */
};

static u8 in_to_reg(const struct it87_data *data, int nr, long val)
{
	long lsb;

	if (data->type == it8721) {
		if (data->in_scaled & (1 << nr))
			lsb = 24;
		else
			lsb = 12;
	} else
		lsb = 16;

	val = DIV_ROUND_CLOSEST(val, lsb);
	return SENSORS_LIMIT(val, 0, 255);
}

static int in_from_reg(const struct it87_data *data, int nr, int val)
{
	if (data->type == it8721) {
		if (data->in_scaled & (1 << nr))
			return val * 24;
		else
			return val * 12;
	} else
		return val * 16;
}

static inline u8 FAN_TO_REG(long rpm, int div)
{
	if (rpm == 0)
		return 255;
	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
			     254);
}

static inline u16 FAN16_TO_REG(long rpm)
{
	if (rpm == 0)
		return 0xffff;
	return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
}

#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : (val) == 255 ? 0 : \
				1350000 / ((val) * (div)))
/* The divider is fixed to 2 in 16-bit mode */
#define FAN16_FROM_REG(val) ((val) == 0 ? -1 : (val) == 0xffff ? 0 : \
			     1350000 / ((val) * 2))

#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val) < 0 ? (((val) - 500) / 1000) : \
					((val) + 500) / 1000), -128, 127))
#define TEMP_FROM_REG(val) ((val) * 1000)

static u8 pwm_to_reg(const struct it87_data *data, long val)
{
	if (data->type == it8721)
		return val;
	else
		return val >> 1;
}

static int pwm_from_reg(const struct it87_data *data, u8 reg)
{
	if (data->type == it8721)
		return reg;
	else
		return (reg & 0x7f) << 1;
}


static int DIV_TO_REG(int val)
{
	int answer = 0;
	while (answer < 7 && (val >>= 1))
		answer++;
	return answer;
}
#define DIV_FROM_REG(val) (1 << (val))

static const unsigned int pwm_freq[8] = {
	48000000 / 128,
	24000000 / 128,
	12000000 / 128,
	8000000 / 128,
	6000000 / 128,
	3000000 / 128,
	1500000 / 128,
	750000 / 128,
};

static inline int has_16bit_fans(const struct it87_data *data)
{
	/* IT8705F Datasheet 0.4.1, 3h == Version G.
	   IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.
	   These are the first revisions with 16bit tachometer support. */
	return (data->type == it87 && data->revision >= 0x03)
	    || (data->type == it8712 && data->revision >= 0x08)
	    || data->type == it8716
	    || data->type == it8718
	    || data->type == it8720
	    || data->type == it8721;
}

static inline int has_old_autopwm(const struct it87_data *data)
{
	/* The old automatic fan speed control interface is implemented
	   by IT8705F chips up to revision F and IT8712F chips up to
	   revision G. */
	return (data->type == it87 && data->revision < 0x03)
	    || (data->type == it8712 && data->revision < 0x08);
}

static int it87_probe(struct platform_device *pdev);
static int __devexit it87_remove(struct platform_device *pdev);

static int it87_read_value(struct it87_data *data, u8 reg);
static void it87_write_value(struct it87_data *data, u8 reg, u8 value);
static struct it87_data *it87_update_device(struct device *dev);
static int it87_check_pwm(struct device *dev);
static void it87_init_device(struct platform_device *pdev);


static struct platform_driver it87_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= DRVNAME,
	},
	.probe	= it87_probe,
	.remove	= __devexit_p(it87_remove),
};

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", in_from_reg(data, nr, data->in[nr]));
}

static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", in_from_reg(data, nr, data->in_min[nr]));
}

static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", in_from_reg(data, nr, data->in_max[nr]));
}

static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	unsigned long val;

	if (strict_strtoul(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->in_min[nr] = in_to_reg(data, nr, val);
	it87_write_value(data, IT87_REG_VIN_MIN(nr),
			data->in_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}
static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	unsigned long val;

	if (strict_strtoul(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->in_max[nr] = in_to_reg(data, nr, val);
	it87_write_value(data, IT87_REG_VIN_MAX(nr),
			data->in_max[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

#define show_in_offset(offset)					\
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,		\
		show_in, NULL, offset);

#define limit_in_offset(offset)					\
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,	\
		show_in_min, set_in_min, offset);		\
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,	\
		show_in_max, set_in_max, offset);

show_in_offset(0);
limit_in_offset(0);
show_in_offset(1);
limit_in_offset(1);
show_in_offset(2);
limit_in_offset(2);
show_in_offset(3);
limit_in_offset(3);
show_in_offset(4);
limit_in_offset(4);
show_in_offset(5);
limit_in_offset(5);
show_in_offset(6);
limit_in_offset(6);
show_in_offset(7);
limit_in_offset(7);
show_in_offset(8);

/* 3 temperatures */
static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
}
static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
}
static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
}
static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->temp_high[nr] = TEMP_TO_REG(val);
	it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}
static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->temp_low[nr] = TEMP_TO_REG(val);
	it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}
#define show_temp_offset(offset)					\
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,		\
		show_temp, NULL, offset - 1);				\
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,	\
		show_temp_max, set_temp_max, offset - 1);		\
static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,	\
		show_temp_min, set_temp_min, offset - 1);

show_temp_offset(1);
show_temp_offset(2);
show_temp_offset(3);

static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	u8 reg = data->sensor;		/* In case the value is updated while
					   we use it */

	if (reg & (1 << nr))
		return sprintf(buf, "3\n");  /* thermal diode */
	if (reg & (8 << nr))
		return sprintf(buf, "4\n");  /* thermistor */
	return sprintf(buf, "0\n");      /* disabled */
}
static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	long val;
	u8 reg;

	if (strict_strtol(buf, 10, &val) < 0)
		return -EINVAL;

	reg = it87_read_value(data, IT87_REG_TEMP_ENABLE);
	reg &= ~(1 << nr);
	reg &= ~(8 << nr);
	if (val == 2) {	/* backwards compatibility */
		dev_warn(dev, "Sensor type 2 is deprecated, please use 4 "
			 "instead\n");
		val = 4;
	}
	/* 3 = thermal diode; 4 = thermistor; 0 = disabled */
	if (val == 3)
		reg |= 1 << nr;
	else if (val == 4)
		reg |= 8 << nr;
	else if (val != 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->sensor = reg;
	it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
	data->valid = 0;	/* Force cache refresh */
	mutex_unlock(&data->update_lock);
	return count;
}
#define show_sensor_offset(offset)					\
static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,	\
		show_sensor, set_sensor, offset - 1);

show_sensor_offset(1);
show_sensor_offset(2);
show_sensor_offset(3);

/* 3 Fans */

static int pwm_mode(const struct it87_data *data, int nr)
{
	int ctrl = data->fan_main_ctrl & (1 << nr);

	if (ctrl == 0)					/* Full speed */
		return 0;
	if (data->pwm_ctrl[nr] & 0x80)			/* Automatic mode */
		return 2;
	else						/* Manual mode */
		return 1;
}

static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
				DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
				DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
}
static ssize_t show_pwm_enable(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", pwm_mode(data, nr));
}
static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n",
		       pwm_from_reg(data, data->pwm_duty[nr]));
}
static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct it87_data *data = it87_update_device(dev);
	int index = (data->fan_ctl >> 4) & 0x07;

	return sprintf(buf, "%u\n", pwm_freq[index]);
}
static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	long val;
	u8 reg;

	if (strict_strtol(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	reg = it87_read_value(data, IT87_REG_FAN_DIV);
	switch (nr) {
	case 0:
		data->fan_div[nr] = reg & 0x07;
		break;
	case 1:
		data->fan_div[nr] = (reg >> 3) & 0x07;
		break;
	case 2:
		data->fan_div[nr] = (reg & 0x40) ? 3 : 1;
		break;
	}

	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}
static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int min;
	u8 old;

	if (strict_strtoul(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	old = it87_read_value(data, IT87_REG_FAN_DIV);

	/* Save fan min limit */
	min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));

	switch (nr) {
	case 0:
	case 1:
		data->fan_div[nr] = DIV_TO_REG(val);
		break;
	case 2:
		if (val < 8)
			data->fan_div[nr] = 1;
		else
			data->fan_div[nr] = 3;
	}
	val = old & 0x80;
	val |= (data->fan_div[0] & 0x07);
	val |= (data->fan_div[1] & 0x07) << 3;
	if (data->fan_div[2] == 3)
		val |= 0x1 << 6;
	it87_write_value(data, IT87_REG_FAN_DIV, val);

	/* Restore fan min limit */
	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);

	mutex_unlock(&data->update_lock);
	return count;
}

/* Returns 0 if OK, -EINVAL otherwise */
static int check_trip_points(struct device *dev, int nr)
{
	const struct it87_data *data = dev_get_drvdata(dev);
	int i, err = 0;

	if (has_old_autopwm(data)) {
		for (i = 0; i < 3; i++) {
			if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1])
				err = -EINVAL;
		}
		for (i = 0; i < 2; i++) {
			if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1])
				err = -EINVAL;
		}
	}

	if (err) {
		dev_err(dev, "Inconsistent trip points, not switching to "
			"automatic mode\n");
		dev_err(dev, "Adjust the trip points and try again\n");
	}
	return err;
}

static ssize_t set_pwm_enable(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 2)
		return -EINVAL;

	/* Check trip points before switching to automatic mode */
	if (val == 2) {
		if (check_trip_points(dev, nr) < 0)
			return -EINVAL;
	}

	mutex_lock(&data->update_lock);

	if (val == 0) {
		int tmp;
		/* make sure the fan is on when in on/off mode */
		tmp = it87_read_value(data, IT87_REG_FAN_CTL);
		it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr));
		/* set on/off mode */
		data->fan_main_ctrl &= ~(1 << nr);
		it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
				 data->fan_main_ctrl);
	} else {
		if (val == 1)				/* Manual mode */
			data->pwm_ctrl[nr] = data->type == it8721 ?
					     data->pwm_temp_map[nr] :
					     data->pwm_duty[nr];
		else					/* Automatic mode */
			data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr];
		it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]);
		/* set SmartGuardian mode */
		data->fan_main_ctrl |= (1 << nr);
		it87_write_value(data, IT87_REG_FAN_MAIN_CTRL,
				 data->fan_main_ctrl);
	}

	mutex_unlock(&data->update_lock);
	return count;
}
static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 255)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	if (data->type == it8721) {
		/* If we are in automatic mode, the PWM duty cycle register
		 * is read-only so we can't write the value */
		if (data->pwm_ctrl[nr] & 0x80) {
			mutex_unlock(&data->update_lock);
			return -EBUSY;
		}
		data->pwm_duty[nr] = pwm_to_reg(data, val);
		it87_write_value(data, IT87_REG_PWM_DUTY(nr),
				 data->pwm_duty[nr]);
	} else {
		data->pwm_duty[nr] = pwm_to_reg(data, val);
		/* If we are in manual mode, write the duty cycle immediately;
		 * otherwise, just store it for later use. */
		if (!(data->pwm_ctrl[nr] & 0x80)) {
			data->pwm_ctrl[nr] = data->pwm_duty[nr];
			it87_write_value(data, IT87_REG_PWM(nr),
					 data->pwm_ctrl[nr]);
		}
	}
	mutex_unlock(&data->update_lock);
	return count;
}
static ssize_t set_pwm_freq(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct it87_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int i;

	if (strict_strtoul(buf, 10, &val) < 0)
		return -EINVAL;

	/* Search for the nearest available frequency */
	for (i = 0; i < 7; i++) {
		if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
			break;
	}

	mutex_lock(&data->update_lock);
	data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
	data->fan_ctl |= i << 4;
	it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
	mutex_unlock(&data->update_lock);

	return count;
}
static ssize_t show_pwm_temp_map(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = it87_update_device(dev);
	int map;

	if (data->pwm_temp_map[nr] < 3)
		map = 1 << data->pwm_temp_map[nr];
	else
		map = 0;			/* Should never happen */
	return sprintf(buf, "%d\n", map);
}
static ssize_t set_pwm_temp_map(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;

	struct it87_data *data = dev_get_drvdata(dev);
	long val;
	u8 reg;

	/* This check can go away if we ever support automatic fan speed
	   control on newer chips. */
	if (!has_old_autopwm(data)) {
		dev_notice(dev, "Mapping change disabled for safety reasons\n");
		return -EINVAL;
	}

	if (strict_strtol(buf, 10, &val) < 0)
		return -EINVAL;

	switch (val) {
	case (1 << 0):
		reg = 0x00;
		break;
	case (1 << 1):
		reg = 0x01;
		break;
	case (1 << 2):
		reg = 0x02;
		break;
	default:
		return -EINVAL;
	}

	mutex_lock(&data->update_lock);
	data->pwm_temp_map[nr] = reg;
	/* If we are in automatic mode, write the temp mapping immediately;
	 * otherwise, just store it for later use. */
	if (data->pwm_ctrl[nr] & 0x80) {
		data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr];
		it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]);
	}
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_auto_pwm(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct it87_data *data = it87_update_device(dev);
	struct sensor_device_attribute_2 *sensor_attr =
			to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int point = sensor_attr->index;

	return sprintf(buf, "%d\n",
		       pwm_from_reg(data, data->auto_pwm[nr][point]));
}

static ssize_t set_auto_pwm(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct it87_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sensor_attr =
			to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int point = sensor_attr->index;
	long val;

	if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 255)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->auto_pwm[nr][point] = pwm_to_reg(data, val);
	it87_write_value(data, IT87_REG_AUTO_PWM(nr, point),
			 data->auto_pwm[nr][point]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_auto_temp(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct it87_data *data = it87_update_device(dev);
	struct sensor_device_attribute_2 *sensor_attr =
			to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int point = sensor_attr->index;

	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->auto_temp[nr][point]));
}

static ssize_t set_auto_temp(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct it87_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sensor_attr =
			to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int point = sensor_attr->index;
	long val;

	if (strict_strtol(buf, 10, &val) < 0 || val < -128000 || val > 127000)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->auto_temp[nr][point] = TEMP_TO_REG(val);
	it87_write_value(data, IT87_REG_AUTO_TEMP(nr, point),
			 data->auto_temp[nr][point]);
	mutex_unlock(&data->update_lock);
	return count;
}

#define show_fan_offset(offset)					\
static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,		\
		show_fan, NULL, offset - 1);			\
static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
		show_fan_min, set_fan_min, offset - 1);		\
static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
		show_fan_div, set_fan_div, offset - 1);

show_fan_offset(1);
show_fan_offset(2);
show_fan_offset(3);

#define show_pwm_offset(offset)						\
static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,	\
		show_pwm_enable, set_pwm_enable, offset - 1);		\
static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,		\
		show_pwm, set_pwm, offset - 1);				\
static DEVICE_ATTR(pwm##offset##_freq,					\
		(offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),		\
		show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));	\
static SENSOR_DEVICE_ATTR(pwm##offset##_auto_channels_temp,		\
		S_IRUGO | S_IWUSR, show_pwm_temp_map, set_pwm_temp_map,	\
		offset - 1);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_pwm,		\
		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
		offset - 1, 0);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_pwm,		\
		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
		offset - 1, 1);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_pwm,		\
		S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm,		\
		offset - 1, 2);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_pwm,		\
		S_IRUGO, show_auto_pwm, NULL, offset - 1, 3);		\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp,		\
		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
		offset - 1, 1);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp_hyst,	\
		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
		offset - 1, 0);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_temp,		\
		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
		offset - 1, 2);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_temp,		\
		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
		offset - 1, 3);						\
static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_temp,		\
		S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp,	\
		offset - 1, 4);

show_pwm_offset(1);
show_pwm_offset(2);
show_pwm_offset(3);

/* A different set of callbacks for 16-bit fans */
static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
}

static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
}

static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct it87_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->fan_min[nr] = FAN16_TO_REG(val);
	it87_write_value(data, IT87_REG_FAN_MIN[nr],
			 data->fan_min[nr] & 0xff);
	it87_write_value(data, IT87_REG_FANX_MIN[nr],
			 data->fan_min[nr] >> 8);
	mutex_unlock(&data->update_lock);
	return count;
}

/* We want to use the same sysfs file names as 8-bit fans, but we need
   different variable names, so we have to use SENSOR_ATTR instead of
   SENSOR_DEVICE_ATTR. */
#define show_fan16_offset(offset) \
static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
	= SENSOR_ATTR(fan##offset##_input, S_IRUGO,		\
		show_fan16, NULL, offset - 1);			\
static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
	= SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,	\
		show_fan16_min, set_fan16_min, offset - 1)

show_fan16_offset(1);
show_fan16_offset(2);
show_fan16_offset(3);
show_fan16_offset(4);
show_fan16_offset(5);

/* Alarms */
static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%u\n", data->alarms);
}
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}
static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14);
static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15);
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);

static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%u\n", (data->beeps >> bitnr) & 1);
}
static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int bitnr = to_sensor_dev_attr(attr)->index;
	struct it87_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) < 0
	 || (val != 0 && val != 1))
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->beeps = it87_read_value(data, IT87_REG_BEEP_ENABLE);
	if (val)
		data->beeps |= (1 << bitnr);
	else
		data->beeps &= ~(1 << bitnr);
	it87_write_value(data, IT87_REG_BEEP_ENABLE, data->beeps);
	mutex_unlock(&data->update_lock);
	return count;
}

static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR,
			  show_beep, set_beep, 1);
static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in5_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in6_beep, S_IRUGO, show_beep, NULL, 1);
static SENSOR_DEVICE_ATTR(in7_beep, S_IRUGO, show_beep, NULL, 1);
/* fanX_beep writability is set later */
static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan3_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan4_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(fan5_beep, S_IRUGO, show_beep, set_beep, 0);
static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR,
			  show_beep, set_beep, 2);
static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO, show_beep, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_beep, S_IRUGO, show_beep, NULL, 2);

static ssize_t show_vrm_reg(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct it87_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%u\n", data->vrm);
}
static ssize_t store_vrm_reg(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct it87_data *data = dev_get_drvdata(dev);
	unsigned long val;

	if (strict_strtoul(buf, 10, &val) < 0)
		return -EINVAL;

	data->vrm = val;

	return count;
}
static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

static ssize_t show_vid_reg(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct it87_data *data = it87_update_device(dev);
	return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);

static ssize_t show_label(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	static const char *labels[] = {
		"+5V",
		"5VSB",
		"Vbat",
	};
	static const char *labels_it8721[] = {
		"+3.3V",
		"3VSB",
		"Vbat",
	};
	struct it87_data *data = dev_get_drvdata(dev);
	int nr = to_sensor_dev_attr(attr)->index;

	return sprintf(buf, "%s\n", data->type == it8721 ? labels_it8721[nr]
							 : labels[nr]);
}
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, 0);
static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, show_label, NULL, 1);
static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, show_label, NULL, 2);

static ssize_t show_name(struct device *dev, struct device_attribute
			 *devattr, char *buf)
{
	struct it87_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct attribute *it87_attributes[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in7_input.dev_attr.attr,
	&sensor_dev_attr_in8_input.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in6_min.dev_attr.attr,
	&sensor_dev_attr_in7_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in6_max.dev_attr.attr,
	&sensor_dev_attr_in7_max.dev_attr.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,
	&sensor_dev_attr_in6_alarm.dev_attr.attr,
	&sensor_dev_attr_in7_alarm.dev_attr.attr,

	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp1_type.dev_attr.attr,
	&sensor_dev_attr_temp2_type.dev_attr.attr,
	&sensor_dev_attr_temp3_type.dev_attr.attr,
	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_alarm.dev_attr.attr,

	&dev_attr_alarms.attr,
	&dev_attr_name.attr,
	NULL
};

static const struct attribute_group it87_group = {
	.attrs = it87_attributes,
};

static struct attribute *it87_attributes_beep[] = {
	&sensor_dev_attr_in0_beep.dev_attr.attr,
	&sensor_dev_attr_in1_beep.dev_attr.attr,
	&sensor_dev_attr_in2_beep.dev_attr.attr,
	&sensor_dev_attr_in3_beep.dev_attr.attr,
	&sensor_dev_attr_in4_beep.dev_attr.attr,
	&sensor_dev_attr_in5_beep.dev_attr.attr,
	&sensor_dev_attr_in6_beep.dev_attr.attr,
	&sensor_dev_attr_in7_beep.dev_attr.attr,

	&sensor_dev_attr_temp1_beep.dev_attr.attr,
	&sensor_dev_attr_temp2_beep.dev_attr.attr,
	&sensor_dev_attr_temp3_beep.dev_attr.attr,
	NULL
};

static const struct attribute_group it87_group_beep = {
	.attrs = it87_attributes_beep,
};

static struct attribute *it87_attributes_fan16[5][3+1] = { {
	&sensor_dev_attr_fan1_input16.dev_attr.attr,
	&sensor_dev_attr_fan1_min16.dev_attr.attr,
	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_fan2_input16.dev_attr.attr,
	&sensor_dev_attr_fan2_min16.dev_attr.attr,
	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_fan3_input16.dev_attr.attr,
	&sensor_dev_attr_fan3_min16.dev_attr.attr,
	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_fan4_input16.dev_attr.attr,
	&sensor_dev_attr_fan4_min16.dev_attr.attr,
	&sensor_dev_attr_fan4_alarm.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_fan5_input16.dev_attr.attr,
	&sensor_dev_attr_fan5_min16.dev_attr.attr,
	&sensor_dev_attr_fan5_alarm.dev_attr.attr,
	NULL
} };

static const struct attribute_group it87_group_fan16[5] = {
	{ .attrs = it87_attributes_fan16[0] },
	{ .attrs = it87_attributes_fan16[1] },
	{ .attrs = it87_attributes_fan16[2] },
	{ .attrs = it87_attributes_fan16[3] },
	{ .attrs = it87_attributes_fan16[4] },
};

static struct attribute *it87_attributes_fan[3][4+1] = { {
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan1_div.dev_attr.attr,
	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan2_div.dev_attr.attr,
	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_fan3_input.dev_attr.attr,
	&sensor_dev_attr_fan3_min.dev_attr.attr,
	&sensor_dev_attr_fan3_div.dev_attr.attr,
	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
	NULL
} };

static const struct attribute_group it87_group_fan[3] = {
	{ .attrs = it87_attributes_fan[0] },
	{ .attrs = it87_attributes_fan[1] },
	{ .attrs = it87_attributes_fan[2] },
};

static const struct attribute_group *
it87_get_fan_group(const struct it87_data *data)
{
	return has_16bit_fans(data) ? it87_group_fan16 : it87_group_fan;
}

static struct attribute *it87_attributes_pwm[3][4+1] = { {
	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&dev_attr_pwm1_freq.attr,
	&sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
	&sensor_dev_attr_pwm2.dev_attr.attr,
	&dev_attr_pwm2_freq.attr,
	&sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
	&sensor_dev_attr_pwm3.dev_attr.attr,
	&dev_attr_pwm3_freq.attr,
	&sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
	NULL
} };

static const struct attribute_group it87_group_pwm[3] = {
	{ .attrs = it87_attributes_pwm[0] },
	{ .attrs = it87_attributes_pwm[1] },
	{ .attrs = it87_attributes_pwm[2] },
};

static struct attribute *it87_attributes_autopwm[3][9+1] = { {
	&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
	&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point1_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr,
	&sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr,
	NULL
}, {
	&sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point1_temp_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr,
	&sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr,
	NULL
} };

static const struct attribute_group it87_group_autopwm[3] = {
	{ .attrs = it87_attributes_autopwm[0] },
	{ .attrs = it87_attributes_autopwm[1] },
	{ .attrs = it87_attributes_autopwm[2] },
};

static struct attribute *it87_attributes_fan_beep[] = {
	&sensor_dev_attr_fan1_beep.dev_attr.attr,
	&sensor_dev_attr_fan2_beep.dev_attr.attr,
	&sensor_dev_attr_fan3_beep.dev_attr.attr,
	&sensor_dev_attr_fan4_beep.dev_attr.attr,
	&sensor_dev_attr_fan5_beep.dev_attr.attr,
};

static struct attribute *it87_attributes_vid[] = {
	&dev_attr_vrm.attr,
	&dev_attr_cpu0_vid.attr,
	NULL
};

static const struct attribute_group it87_group_vid = {
	.attrs = it87_attributes_vid,
};

static struct attribute *it87_attributes_label[] = {
	&sensor_dev_attr_in3_label.dev_attr.attr,
	&sensor_dev_attr_in7_label.dev_attr.attr,
	&sensor_dev_attr_in8_label.dev_attr.attr,
	NULL
};

static const struct attribute_group it87_group_label = {
	.attrs = it87_attributes_label,
};

/* SuperIO detection - will change isa_address if a chip is found */
static int __init it87_find(unsigned short *address,
	struct it87_sio_data *sio_data)
{
	int err;
	u16 chip_type;
	const char *board_vendor, *board_name;

	err = superio_enter();
	if (err)
		return err;

	err = -ENODEV;
	chip_type = force_id ? force_id : superio_inw(DEVID);

	switch (chip_type) {
	case IT8705F_DEVID:
		sio_data->type = it87;
		break;
	case IT8712F_DEVID:
		sio_data->type = it8712;
		break;
	case IT8716F_DEVID:
	case IT8726F_DEVID:
		sio_data->type = it8716;
		break;
	case IT8718F_DEVID:
		sio_data->type = it8718;
		break;
	case IT8720F_DEVID:
		sio_data->type = it8720;
		break;
	case IT8721F_DEVID:
		sio_data->type = it8721;
		break;
	case 0xffff:	/* No device at all */
		goto exit;
	default:
		pr_debug("Unsupported chip (DEVID=0x%x)\n", chip_type);
		goto exit;
	}

	superio_select(PME);
	if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
		pr_info("Device not activated, skipping\n");
		goto exit;
	}

	*address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
	if (*address == 0) {
		pr_info("Base address not set, skipping\n");
		goto exit;
	}

	err = 0;
	sio_data->revision = superio_inb(DEVREV) & 0x0f;
	pr_info("Found IT%04xF chip at 0x%x, revision %d\n",
		chip_type, *address, sio_data->revision);

	/* in8 (Vbat) is always internal */
	sio_data->internal = (1 << 2);

	/* Read GPIO config and VID value from LDN 7 (GPIO) */
	if (sio_data->type == it87) {
		/* The IT8705F doesn't have VID pins at all */
		sio_data->skip_vid = 1;

		/* The IT8705F has a different LD number for GPIO */
		superio_select(5);
		sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;
	} else {
		int reg;

		superio_select(GPIO);

		reg = superio_inb(IT87_SIO_GPIO3_REG);
		if (sio_data->type == it8721) {
			/* The IT8721F/IT8758E doesn't have VID pins at all */
			sio_data->skip_vid = 1;
		} else {
			/* We need at least 4 VID pins */
			if (reg & 0x0f) {
				pr_info("VID is disabled (pins used for GPIO)\n");
				sio_data->skip_vid = 1;
			}
		}

		/* Check if fan3 is there or not */
		if (reg & (1 << 6))
			sio_data->skip_pwm |= (1 << 2);
		if (reg & (1 << 7))
			sio_data->skip_fan |= (1 << 2);

		/* Check if fan2 is there or not */
		reg = superio_inb(IT87_SIO_GPIO5_REG);
		if (reg & (1 << 1))
			sio_data->skip_…