linux-imx

/* tmp421.c

 *

 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>

 * Preliminary support by:

 * Melvin Rook, Raymond Ng

 *

 * 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.

 */

​

/*

 * Driver for the Texas Instruments TMP421 SMBus temperature sensor IC.

 * Supported models: TMP421, TMP422, TMP423, TMP441, TMP442

 */

​

#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/of_device.h>

#include <linux/sysfs.h>

​

/* Addresses to scan */

static const unsigned short normal_i2c[] = { 0x2a, 0x4c, 0x4d, 0x4e, 0x4f,

                         I2C_CLIENT_END };

​

enum chips { tmp421, tmp422, tmp423, tmp441, tmp442 };

​

/* The TMP421 registers */

#define TMP421_STATUS_REG           0x08

#define TMP421_CONFIG_REG_1         0x09

#define TMP421_CONVERSION_RATE_REG      0x0B

#define TMP421_MANUFACTURER_ID_REG      0xFE

#define TMP421_DEVICE_ID_REG            0xFF

​

static const u8 TMP421_TEMP_MSB[4]      = { 0x00, 0x01, 0x02, 0x03 };

static const u8 TMP421_TEMP_LSB[4]      = { 0x10, 0x11, 0x12, 0x13 };

​

/* Flags */

#define TMP421_CONFIG_SHUTDOWN          0x40

#define TMP421_CONFIG_RANGE         0x04

​

/* Manufacturer / Device ID's */

#define TMP421_MANUFACTURER_ID          0x55

#define TMP421_DEVICE_ID            0x21

#define TMP422_DEVICE_ID            0x22

#define TMP423_DEVICE_ID            0x23

#define TMP441_DEVICE_ID            0x41

#define TMP442_DEVICE_ID            0x42

​

static const struct i2c_device_id tmp421_id[] = {

    { "tmp421", 2 },

    { "tmp422", 3 },

    { "tmp423", 4 },

    { "tmp441", 2 },

    { "tmp442", 3 },

    { }

};

MODULE_DEVICE_TABLE(i2c, tmp421_id);

​

static const struct of_device_id tmp421_of_match[] = {

    {

        .compatible = "ti,tmp421",

        .data = (void *)2

    },

    {

        .compatible = "ti,tmp422",

        .data = (void *)3

    },

    {

        .compatible = "ti,tmp423",

        .data = (void *)4

    },

    {

        .compatible = "ti,tmp441",

        .data = (void *)2

    },

    {

        .compatible = "ti,tmp442",

        .data = (void *)3