linux-imx

/*

 * lm75.c - Part of lm_sensors, Linux kernel modules for hardware

 *   monitoring

 * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>

 *

 * 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/of_device.h>

#include <linux/of.h>

#include <linux/regmap.h>

#include "lm75.h"

​

​

/*

 * This driver handles the LM75 and compatible digital temperature sensors.

 */

​

enum lm75_type {        /* keep sorted in alphabetical order */

    adt75,

    ds1775,

    ds75,

    ds7505,

    g751,

    lm75,

    lm75a,

    lm75b,

    max6625,

    max6626,

    max31725,

    mcp980x,

    stds75,

    stlm75,

    tcn75,

    tmp100,

    tmp101,

    tmp105,

    tmp112,

    tmp175,

    tmp275,

    tmp75,

    tmp75c,

};

​

/* Addresses scanned */

static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,

                    0x4d, 0x4e, 0x4f, I2C_CLIENT_END };

​

/* The LM75 registers */

#define LM75_REG_TEMP       0x00

#define LM75_REG_CONF       0x01

#define LM75_REG_HYST       0x02

#define LM75_REG_MAX        0x03

​

/* Each client has this additional data */

struct lm75_data {

    struct i2c_client   *client;

    struct regmap       *regmap;

    u8          orig_conf;

    u8          resolution; /* In bits, between 9 and 16 */

    u8          resolution_limits;

    unsigned int        sample_time;    /* In ms */

};

​

/*-----------------------------------------------------------------------*/

​

static inline long lm75_reg_to_mc(s16 temp, u8 resolution)

{

    return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);

}

​

static int lm75_read(struct device *dev, enum hwmon_sensor_types type,