linux-imx

/*

 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware

 *             monitoring

 * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>

 *                         Jean Delvare <jdelvare@suse.de>

 *

 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.

 * It reports up to two temperatures (its own plus up to

 * one external one). Complete datasheet can be

 * obtained from Maxim's website at:

 *   http://pdfserv.maxim-ic.com/en/ds/MAX1619.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.

 */

​

#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-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/sysfs.h>

​

static const unsigned short normal_i2c[] = {

    0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };

​

/*

 * The MAX1619 registers

 */

​

#define MAX1619_REG_R_MAN_ID        0xFE

#define MAX1619_REG_R_CHIP_ID       0xFF

#define MAX1619_REG_R_CONFIG        0x03

#define MAX1619_REG_W_CONFIG        0x09

#define MAX1619_REG_R_CONVRATE      0x04

#define MAX1619_REG_W_CONVRATE      0x0A

#define MAX1619_REG_R_STATUS        0x02

#define MAX1619_REG_R_LOCAL_TEMP    0x00

#define MAX1619_REG_R_REMOTE_TEMP   0x01

#define MAX1619_REG_R_REMOTE_HIGH   0x07

#define MAX1619_REG_W_REMOTE_HIGH   0x0D

#define MAX1619_REG_R_REMOTE_LOW    0x08

#define MAX1619_REG_W_REMOTE_LOW    0x0E

#define MAX1619_REG_R_REMOTE_CRIT   0x10

#define MAX1619_REG_W_REMOTE_CRIT   0x12

#define MAX1619_REG_R_TCRIT_HYST    0x11

#define MAX1619_REG_W_TCRIT_HYST    0x13

​

/*

 * Conversions

 */

​

static int temp_from_reg(int val)

{

    return (val & 0x80 ? val-0x100 : val) * 1000;

}

​

static int temp_to_reg(int val)

{

    return (val < 0 ? val+0x100*1000 : val) / 1000;

}

​

enum temp_index {

    t_input1 = 0,

    t_input2,

    t_low2,

    t_high2,

    t_crit2,

    t_hyst2,

    t_num_regs

};

​

/*

 * Client data (each client gets its own)

 */

​

struct max1619_data {

    struct i2c_client *client;

    struct mutex update_lock;

    char valid; /* zero until following fields are valid */

    unsigned long last_updated; /* in jiffies */