linux-imx

/*

 * ADT7310/ADT7310 digital temperature sensor driver

 *

 * Copyright 2012-2013 Analog Devices Inc.

 *   Author: Lars-Peter Clausen <lars@metafoo.de>

 *

 * Licensed under the GPL-2 or later.

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/spi/spi.h>

#include <asm/unaligned.h>

​

#include "adt7x10.h"

​

#define ADT7310_STATUS          0

#define ADT7310_CONFIG          1

#define ADT7310_TEMPERATURE     2

#define ADT7310_ID          3

#define ADT7310_T_CRIT          4

#define ADT7310_T_HYST          5

#define ADT7310_T_ALARM_HIGH        6

#define ADT7310_T_ALARM_LOW     7

​

static const u8 adt7310_reg_table[] = {

    [ADT7X10_TEMPERATURE]   = ADT7310_TEMPERATURE,

    [ADT7X10_STATUS]    = ADT7310_STATUS,

    [ADT7X10_CONFIG]    = ADT7310_CONFIG,

    [ADT7X10_T_ALARM_HIGH]  = ADT7310_T_ALARM_HIGH,

    [ADT7X10_T_ALARM_LOW]   = ADT7310_T_ALARM_LOW,

    [ADT7X10_T_CRIT]    = ADT7310_T_CRIT,

    [ADT7X10_T_HYST]    = ADT7310_T_HYST,

    [ADT7X10_ID]        = ADT7310_ID,

};

​

#define ADT7310_CMD_REG_OFFSET  3

#define ADT7310_CMD_READ    0x40

​

#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)

​

static int adt7310_spi_read_word(struct device *dev, u8 reg)

{

    struct spi_device *spi = to_spi_device(dev);

​

    return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);

}

​

static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)

{

    struct spi_device *spi = to_spi_device(dev);

    u8 buf[3];

​

    buf[0] = AD7310_COMMAND(reg);

    put_unaligned_be16(data, &buf[1]);

​

    return spi_write(spi, buf, sizeof(buf));

}

​

static int adt7310_spi_read_byte(struct device *dev, u8 reg)

{

    struct spi_device *spi = to_spi_device(dev);

​