linux/drivers/hwmon/adt7310.c
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   1/*
   2 * ADT7310/ADT7310 digital temperature sensor driver
   3 *
   4 * Copyright 2012-2013 Analog Devices Inc.
   5 *   Author: Lars-Peter Clausen <lars@metafoo.de>
   6 *
   7 * Licensed under the GPL-2 or later.
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/init.h>
  12#include <linux/spi/spi.h>
  13#include <asm/unaligned.h>
  14
  15#include "adt7x10.h"
  16
  17#define ADT7310_STATUS                  0
  18#define ADT7310_CONFIG                  1
  19#define ADT7310_TEMPERATURE             2
  20#define ADT7310_ID                      3
  21#define ADT7310_T_CRIT                  4
  22#define ADT7310_T_HYST                  5
  23#define ADT7310_T_ALARM_HIGH            6
  24#define ADT7310_T_ALARM_LOW             7
  25
  26static const u8 adt7310_reg_table[] = {
  27        [ADT7X10_TEMPERATURE]   = ADT7310_TEMPERATURE,
  28        [ADT7X10_STATUS]        = ADT7310_STATUS,
  29        [ADT7X10_CONFIG]        = ADT7310_CONFIG,
  30        [ADT7X10_T_ALARM_HIGH]  = ADT7310_T_ALARM_HIGH,
  31        [ADT7X10_T_ALARM_LOW]   = ADT7310_T_ALARM_LOW,
  32        [ADT7X10_T_CRIT]        = ADT7310_T_CRIT,
  33        [ADT7X10_T_HYST]        = ADT7310_T_HYST,
  34        [ADT7X10_ID]            = ADT7310_ID,
  35};
  36
  37#define ADT7310_CMD_REG_OFFSET  3
  38#define ADT7310_CMD_READ        0x40
  39
  40#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
  41
  42static int adt7310_spi_read_word(struct device *dev, u8 reg)
  43{
  44        struct spi_device *spi = to_spi_device(dev);
  45        int ret;
  46
  47        ret = spi_w8r16(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  48        if (ret < 0)
  49                return ret;
  50
  51        return be16_to_cpu((__force __be16)ret);
  52}
  53
  54static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
  55{
  56        struct spi_device *spi = to_spi_device(dev);
  57        u8 buf[3];
  58
  59        buf[0] = AD7310_COMMAND(reg);
  60        put_unaligned_be16(data, &buf[1]);
  61
  62        return spi_write(spi, buf, sizeof(buf));
  63}
  64
  65static int adt7310_spi_read_byte(struct device *dev, u8 reg)
  66{
  67        struct spi_device *spi = to_spi_device(dev);
  68
  69        return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  70}
  71
  72static int adt7310_spi_write_byte(struct device *dev, u8 reg,
  73        u8 data)
  74{
  75        struct spi_device *spi = to_spi_device(dev);
  76        u8 buf[2];
  77
  78        buf[0] = AD7310_COMMAND(reg);
  79        buf[1] = data;
  80
  81        return spi_write(spi, buf, sizeof(buf));
  82}
  83
  84static const struct adt7x10_ops adt7310_spi_ops = {
  85        .read_word = adt7310_spi_read_word,
  86        .write_word = adt7310_spi_write_word,
  87        .read_byte = adt7310_spi_read_byte,
  88        .write_byte = adt7310_spi_write_byte,
  89};
  90
  91static int adt7310_spi_probe(struct spi_device *spi)
  92{
  93        return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
  94                        &adt7310_spi_ops);
  95}
  96
  97static int adt7310_spi_remove(struct spi_device *spi)
  98{
  99        return adt7x10_remove(&spi->dev, spi->irq);
 100}
 101
 102static const struct spi_device_id adt7310_id[] = {
 103        { "adt7310", 0 },
 104        { "adt7320", 0 },
 105        {}
 106};
 107MODULE_DEVICE_TABLE(spi, adt7310_id);
 108
 109static struct spi_driver adt7310_driver = {
 110        .driver = {
 111                .name   = "adt7310",
 112                .owner  = THIS_MODULE,
 113                .pm     = ADT7X10_DEV_PM_OPS,
 114        },
 115        .probe          = adt7310_spi_probe,
 116        .remove         = adt7310_spi_remove,
 117        .id_table       = adt7310_id,
 118};
 119module_spi_driver(adt7310_driver);
 120
 121MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 122MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
 123MODULE_LICENSE("GPL");
 124
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