linux-imx

/*

 * Copyright (c) 2011 David George <david.george@ska.ac.za>

 *

 * based on adm1021.c

 * some credit to Christoph Scheurer, but largely a rewrite

 *

 * 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-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

​

/* Addresses to scan */

static const unsigned short max1668_addr_list[] = {

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

​

/* max1668 registers */

​

#define MAX1668_REG_TEMP(nr)    (nr)

#define MAX1668_REG_STAT1   0x05

#define MAX1668_REG_STAT2   0x06

#define MAX1668_REG_MAN_ID  0xfe

#define MAX1668_REG_DEV_ID  0xff

​

/* limits */

​

/* write high limits */

#define MAX1668_REG_LIMH_WR(nr) (0x13 + 2 * (nr))

/* write low limits */

#define MAX1668_REG_LIML_WR(nr) (0x14 + 2 * (nr))

/* read high limits */

#define MAX1668_REG_LIMH_RD(nr) (0x08 + 2 * (nr))

/* read low limits */

#define MAX1668_REG_LIML_RD(nr) (0x09 + 2 * (nr))

​

/* manufacturer and device ID Constants */

#define MAN_ID_MAXIM        0x4d

#define DEV_ID_MAX1668      0x3

#define DEV_ID_MAX1805      0x5

#define DEV_ID_MAX1989      0xb

​

/* read only mode module parameter */

static bool read_only;

module_param(read_only, bool, 0);

MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");

​

enum chips { max1668, max1805, max1989 };

​

struct max1668_data {

    struct i2c_client *client;

    const struct attribute_group *groups[3];

    enum chips type;

​

    struct mutex update_lock;

    char valid;     /* !=0 if following fields are valid */

    unsigned long last_updated; /* In jiffies */

​

    /* 1x local and 4x remote */

    s8 temp_max[5];

    s8 temp_min[5];

    s8 temp[5];

    u16 alarms;

};

​

static struct max1668_data *max1668_update_device(struct device *dev)

{

    struct max1668_data *data = dev_get_drvdata(dev);

    struct i2c_client *client = data->client;

    struct max1668_data *ret = data;

    s32 val;

    int i;

​

    mutex_lock(&data->update_lock);