linux-imx

/*

 * adm9240.c    Part of lm_sensors, Linux kernel modules for hardware

 *      monitoring

 *

 * Copyright (C) 1999   Frodo Looijaard <frodol@dds.nl>

 *          Philip Edelbrock <phil@netroedge.com>

 * Copyright (C) 2003   Michiel Rook <michiel@grendelproject.nl>

 * Copyright (C) 2005   Grant Coady <gcoady.lk@gmail.com> with valuable

 *              guidance from Jean Delvare

 *

 * Driver supports  Analog Devices      ADM9240

 *          Dallas Semiconductor    DS1780

 *          National Semiconductor  LM81

 *

 * ADM9240 is the reference, DS1780 and LM81 are register compatibles

 *

 * Voltage  Six inputs are scaled by chip, VID also reported

 * Temperature  Chip temperature to 0.5'C, maximum and max_hysteris

 * Fans     2 fans, low speed alarm, automatic fan clock divider

 * Alarms   16-bit map of active alarms

 * Analog Out   0..1250 mV output

 *

 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'

 *

 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant

 *

 * LM81 extended temp reading not implemented

 *

 * 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/init.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/hwmon-sysfs.h>

#include <linux/hwmon.h>

#include <linux/hwmon-vid.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/jiffies.h>

​

/* Addresses to scan */

static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,

                    I2C_CLIENT_END };

​

enum chips { adm9240, ds1780, lm81 };

​

/* ADM9240 registers */

#define ADM9240_REG_MAN_ID      0x3e

#define ADM9240_REG_DIE_REV     0x3f

#define ADM9240_REG_CONFIG      0x40

​

#define ADM9240_REG_IN(nr)      (0x20 + (nr))   /* 0..5 */

#define ADM9240_REG_IN_MAX(nr)      (0x2b + (nr) * 2)

#define ADM9240_REG_IN_MIN(nr)      (0x2c + (nr) * 2)

#define ADM9240_REG_FAN(nr)     (0x28 + (nr))   /* 0..1 */

#define ADM9240_REG_FAN_MIN(nr)     (0x3b + (nr))

#define ADM9240_REG_INT(nr)     (0x41 + (nr))

#define ADM9240_REG_INT_MASK(nr)    (0x43 + (nr))

#define ADM9240_REG_TEMP        0x27

#define ADM9240_REG_TEMP_MAX(nr)    (0x39 + (nr)) /* 0, 1 = high, hyst */

#define ADM9240_REG_ANALOG_OUT      0x19

#define ADM9240_REG_CHASSIS_CLEAR   0x46

#define ADM9240_REG_VID_FAN_DIV     0x47

#define ADM9240_REG_I2C_ADDR        0x48

#define ADM9240_REG_VID4        0x49

#define ADM9240_REG_TEMP_CONF       0x4b

​

/* generalised scaling with integer rounding */

static inline int SCALE(long val, int mul, int div)

{

    if (val < 0)

        return (val * mul - div / 2) / div;

    else

        return (val * mul + div / 2) / div;

}

​

/* adm9240 internally scales voltage measurements */

static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };