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>
 * Copyright (C) 2009 Jean Delvare <jdelvare@suse.de>
 *
 * 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/hwmon-vid.h>
#include <linux/err.h>
#include <linux/jiffies.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_DEVREV2		0x12	/* ADT7490 only */

#define REG_VTT			0x1E	/* ADT7490 only */
#define REG_EXTEND3		0x1F	/* ADT7490 only */

#define REG_VOLTAGE_BASE	0x20
#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_DEVID2		0x3F

#define REG_STATUS1		0x41
#define REG_STATUS2		0x42

#define REG_VID			0x43	/* ADT7476 only */

#define REG_VOLTAGE_MIN_BASE	0x44
#define REG_VOLTAGE_MAX_BASE	0x45

#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_CONFIG2		0x73

#define REG_EXTEND1		0x76
#define REG_EXTEND2		0x77

#define REG_CONFIG3		0x78
#define REG_CONFIG5		0x7C
#define REG_CONFIG4		0x7D

#define REG_STATUS4		0x81	/* ADT7490 only */

#define REG_VTT_MIN		0x84	/* ADT7490 only */
#define REG_VTT_MAX		0x86	/* ADT7490 only */

#define VID_VIDSEL		0x80	/* ADT7476 only */

#define CONFIG2_ATTN		0x20

#define CONFIG3_SMBALERT	0x01
#define CONFIG3_THERM		0x02

#define CONFIG4_PINFUNC		0x03
#define CONFIG4_MAXDUTY		0x08
#define CONFIG4_ATTN_IN10	0x30
#define CONFIG4_ATTN_IN43	0xC0

#define CONFIG5_TWOSCOMP	0x01
#define CONFIG5_TEMPOFFSET	0x02
#define CONFIG5_VIDGPIO		0x10	/* ADT7476 only */

/* ADT7475 Settings */

#define ADT7475_VOLTAGE_COUNT	5	/* Not counting Vtt */
#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 const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

enum chips { adt7473, adt7475, adt7476, adt7490 };

static const struct i2c_device_id adt7475_id[]