path: root/drivers/hwmon/adt7475.c

/*
 * adt7475 - Thermal sensor driver for the ADT7475 chip and derivatives
 * Copyright (C) 2007-2008, Advanced Micro Devices, Inc.
 * Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
 * Copyright (C) 2008 Hans de Goede <hdegoede@redhat.com>

 * Derived from the lm83 driver by Jean Delvare
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>

/* Indexes for the sysfs hooks */

#define INPUT		0
#define MIN		1
#define MAX		2
#define CONTROL		3
#define OFFSET		3
#define AUTOMIN		4
#define THERM		5
#define HYSTERSIS	6

/* These are unique identifiers for the sysfs functions - unlike the
   numbers above, these are not also indexes into an array
*/

#define ALARM		9
#define FAULT		10

/* 7475 Common Registers */

#define REG_VOLTAGE_BASE	0x21
#define REG_TEMP_BASE		0x25
#define REG_TACH_BASE		0x28
#define REG_PWM_BASE		0x30
#define REG_PWM_MAX_BASE	0x38

#define REG_DEVID		0x3D
#define REG_VENDID		0x3E

#define REG_STATUS1		0x41
#define REG_STATUS2		0x42

#define REG_VOLTAGE_MIN_BASE	0x46
#define REG_VOLTAGE_MAX_BASE	0x47

#define REG_TEMP_MIN_BASE	0x4E
#define REG_TEMP_MAX_BASE	0x4F

#define REG_TACH_MIN_BASE	0x54

#define REG_PWM_CONFIG_BASE	0x5C

#define REG_TEMP_TRANGE_BASE	0x5F

#define REG_PWM_MIN_BASE	0x64

#define REG_TEMP_TMIN_BASE	0x67
#define REG_TEMP_THERM_BASE	0x6A

#define REG_REMOTE1_HYSTERSIS	0x6D
#define REG_REMOTE2_HYSTERSIS	0x6E

#define REG_TEMP_OFFSET_BASE	0x70

#define REG_EXTEND1		0x76
#define REG_EXTEND2		0x77
#define REG_CONFIG5		0x7C

#define CONFIG5_TWOSCOMP	0x01
#define CONFIG5_TEMPOFFSET	0x02

/* ADT7475 Settings */

#define ADT7475_VOLTAGE_COUNT	2
#define ADT7475_TEMP_COUNT	3
#define ADT7475_TACH_COUNT	4
#define ADT7475_PWM_COUNT	3

/* Macro to read the registers */

#define adt7475_read(reg) i2c_smbus_read_byte_data(client, (reg))

/* Macros to easily index the registers */

#define TACH_REG(idx) (REG_TACH_BASE + ((idx) * 2))
#define TACH_MIN_REG(idx) (REG_TACH_MIN_BASE + ((idx) * 2))

#define PWM_REG(idx) (REG_PWM_BASE + (idx))
#define PWM_MAX_REG(idx) (REG_PWM_MAX_BASE + (idx))
#define PWM_MIN_REG(idx) (REG_PWM_MIN_BASE + (idx))
#define PWM_CONFIG_REG(idx) (REG_PWM_CONFIG_BASE + (idx))

#define VOLTAGE_REG(idx) (REG_VOLTAGE_BASE + (idx))
#define VOLTAGE_MIN_REG(idx) (REG_VOLTAGE_MIN_BASE + ((idx) * 2))
#define VOLTAGE_MAX_REG(idx) (REG_VOLTAGE_MAX_BASE + ((idx) * 2))

#define TEMP_REG(idx) (REG_TEMP_BASE + (idx))
#define TEMP_MIN_REG(idx) (REG_TEMP_MIN_BASE + ((idx) * 2))
#define TEMP_MAX_REG(idx) (REG_TEMP_MAX_BASE + ((idx) * 2))
#define TEMP_TMIN_REG(idx) (REG_TEMP_TMIN_BASE + (idx))
#define TEMP_THERM_REG(idx) (REG_TEMP_THERM_BASE + (idx))
#define TEMP_OFFSET_REG(idx) (REG_TEMP_OFFSET_BASE + (idx))
#define TEMP_TRANGE_REG(idx) (REG_TEMP_TRANGE_BASE + (idx))

static unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };

I2C_CLIENT_INSMOD_1(adt7475);

static const struct i2c_device_id adt7475_id[] = {
	{ "adt7475", adt7475 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adt7475_id);

struct adt7475_data {
	struct device *hwmon_dev;
	struct mutex lock;

	unsigned long measure_updated;
	unsigned long limits_updated;
	char valid;

	u8 config5;
	u16 alarms;
	u16 voltage[3][3];
	u16 temp[7][3];
	u16 tach[2][4];
	u8 pwm[4][3];
	u8 range[3];
	u8 pwmctl[3];
	u8 pwmchan[3];
};

static struct i2c_driver adt7475_driver;
static struct adt7475_data *adt7475_update_device(struct device *dev);
static void adt7475_read_hystersis(struct i2c_client *client);
static void adt7475_read_pwm(struct i2c_client *client, int index);

/* Given a temp value, convert it to register value */

static inline u16 temp2reg(struct adt7475_data *data, long val)
{
	u16 ret;

	if (!(data->config5 & CONFIG5_TWOSCOMP)) {
		val = SENSORS_LIMIT(val, -64000, 191000);
		ret = (val + 64500) / 1000;
	} else {
		val = SENSORS_LIMIT(val, -128000, 127000);
		if (val < -500)
			ret = (256500 + val) / 1000;
		else
			ret = (val + 500) / 1000;
	}