path: root/drivers/hwmon/lm85.c

/*
    lm85.c - Part of lm_sensors, Linux kernel modules for hardware
             monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
    Copyright (c) 2002, 2003  Philip Pokorny <ppokorny@penguincomputing.com>
    Copyright (c) 2003        Margit Schubert-While <margitsw@t-online.de>
    Copyright (c) 2004        Justin Thiessen <jthiessen@penguincomputing.com>
    Copyright (C) 2007, 2008  Jean Delvare <khali@linux-fr.org>

    Chip details at	      <http://www.national.com/ds/LM/LM85.pdf>

    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.
*/

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

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_7(lm85b, lm85c, adm1027, adt7463, adt7468, emc6d100,
		    emc6d102);

/* The LM85 registers */

#define	LM85_REG_IN(nr)			(0x20 + (nr))
#define	LM85_REG_IN_MIN(nr)		(0x44 + (nr) * 2)
#define	LM85_REG_IN_MAX(nr)		(0x45 + (nr) * 2)

#define	LM85_REG_TEMP(nr)		(0x25 + (nr))
#define	LM85_REG_TEMP_MIN(nr)		(0x4e + (nr) * 2)
#define	LM85_REG_TEMP_MAX(nr)		(0x4f + (nr) * 2)

/* Fan speeds are LSB, MSB (2 bytes) */
#define	LM85_REG_FAN(nr)		(0x28 + (nr) * 2)
#define	LM85_REG_FAN_MIN(nr)		(0x54 + (nr) * 2)

#define	LM85_REG_PWM(nr)		(0x30 + (nr))

#define	LM85_REG_COMPANY		0x3e
#define	LM85_REG_VERSTEP		0x3f

#define	ADT7468_REG_CFG5		0x7c
#define		ADT7468_OFF64		0x01
#define	IS_ADT7468_OFF64(data)		\
	((data)->type == adt7468 && !((data)->cfg5 & ADT7468_OFF64))

/* These are the recognized values for the above regs */
#define	LM85_COMPANY_NATIONAL		0x01
#define	LM85_COMPANY_ANALOG_DEV		0x41
#define	LM85_COMPANY_SMSC		0x5c
#define	LM85_VERSTEP_VMASK              0xf0
#define	LM85_VERSTEP_GENERIC		0x60
#define	LM85_VERSTEP_GENERIC2		0x70
#define	LM85_VERSTEP_LM85C		0x60
#define	LM85_VERSTEP_LM85B		0x62
#define	LM85_VERSTEP_LM96000_1		0x68
#define	LM85_VERSTEP_LM96000_2		0x69
#define	LM85_VERSTEP_ADM1027		0x60
#define	LM85_VERSTEP_ADT7463		0x62
#define	LM85_VERSTEP_ADT7463C		0x6A
#define	LM85_VERSTEP_ADT7468_1		0x71
#define	LM85_VERSTEP_ADT7468_2		0x72
#define	LM85_VERSTEP_EMC6D100_A0        0x60
#define	LM85_VERSTEP_EMC6D100_A1        0x61
#define	LM85_VERSTEP_EMC6D102		0x65

#define	LM85_REG_CONFIG			0x40

#define	LM85_REG_ALARM1			0x41
#define	LM85_REG_ALARM2			0x42

#define	LM85_REG_VID			0x43

/* Automated FAN control */
#define	LM85_REG_AFAN_CONFIG(nr)	(0x5c + (nr))
#define	LM85_REG_AFAN_RANGE(nr)		(0x5f + (nr))
#define	LM85_REG_AFAN_SPIKE1		0x62
#define	LM85_REG_AFAN_MINPWM(nr)	(0x64 + (nr))
#define	LM85_REG_AFAN_LIMIT(nr)		(0x67 + (nr))
#define	LM85_REG_AFAN_CRITICAL(nr)	(0x6a + (nr))
#define	LM85_REG_AFAN_HYST1		0x6d
#define	LM85_REG_AFAN_HYST2		0x6e

#define	ADM1027_REG_EXTEND_ADC1		0x76
#define	ADM1027_REG_EXTEND_ADC2		0x77

#define EMC6D100_REG_ALARM3             0x7d
/* IN5, IN6 and IN7 */
#define	EMC6D100_REG_IN(nr)             (0x70 + ((nr) - 5))
#define	EMC6D100_REG_IN_MIN(nr)         (0x73 + ((nr) - 5) * 2)
#define	EMC6D100_REG_IN_MAX(nr)         (0x74 + ((nr) - 5) * 2)
#define	EMC6D102_REG_EXTEND_ADC1	0x85
#define	EMC6D102_REG_EXTEND_ADC2	0x86
#define	EMC6D102_REG_EXTEND_ADC3	0x87
#define	EMC6D102_REG_EXTEND_ADC4	0x88


/* Conversions. Rounding and limit checking is only done on the TO_REG
   variants. Note that you should be a bit careful with which arguments
   these macros are called: arguments may be evaluated more than once.
 */

/* IN are scaled acording to built-in resistors */
static const int lm85_scaling[] = {  /* .001 Volts */
	2500, 2250, 3300, 5000, 12000,
	3300, 1500, 1800 /*EMC6D100*/
};
#define SCALE(val, from, to)	(((val) * (to) + ((from) / 2)) / (from))

#define INS_TO_REG(n, val)	\
		SENSORS_LIMIT(SCALE(val, lm85_scaling[n], 192), 0, 255)

#define INSEXT_FROM_REG(n, val, ext)	\
		SCALE(((val) << 4) + (ext), 192 << 4, lm85_scaling[n])

#define INS_FROM_REG(n, val)	SCALE((val), 192, lm85_scaling[n])

/* FAN speed is measured using 90kHz clock */
static