LXR linux/drivers/hwmon/adt7310.c

   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
  46        return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  47}
  48
  49static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
  50{
  51        struct spi_device *spi = to_spi_device(dev);
  52        u8 buf[3];
  53
  54        buf[0] = AD7310_COMMAND(reg);
  55        put_unaligned_be16(data, &buf[1]);
  56
  57        return spi_write(spi, buf, sizeof(buf));
  58}
  59
  60static int adt7310_spi_read_byte(struct device *dev, u8 reg)
  61{
  62        struct spi_device *spi = to_spi_device(dev);
  63
  64        return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  65}
  66
  67static int adt7310_spi_write_byte(struct device *dev, u8 reg,
  68        u8 data)
  69{
  70        struct spi_device *spi = to_spi_device(dev);
  71        u8 buf[2];
  72
  73        buf[0] = AD7310_COMMAND(reg);
  74        buf[1] = data;
  75
  76        return spi_write(spi, buf, sizeof(buf));
  77}
  78
  79static const struct adt7x10_ops adt7310_spi_ops = {
  80        .read_word = adt7310_spi_read_word,
  81        .write_word = adt7310_spi_write_word,
  82        .read_byte = adt7310_spi_read_byte,
  83        .write_byte = adt7310_spi_write_byte,
  84};
  85
  86static int adt7310_spi_probe(struct spi_device *spi)
  87{
  88        return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
  89                        &adt7310_spi_ops);
  90}
  91
  92static int adt7310_spi_remove(struct spi_device *spi)
  93{
  94        return adt7x10_remove(&spi->dev, spi->irq);
  95}
  96
  97static const struct spi_device_id adt7310_id[] = {
  98        { "adt7310", 0 },
  99        { "adt7320", 0 },
 100        {}
 101};
 102MODULE_DEVICE_TABLE(spi, adt7310_id);
 103
 104static struct spi_driver adt7310_driver = {
 105        .driver = {
 106                .name   = "adt7310",
 107                .pm     = ADT7X10_DEV_PM_OPS,
 108        },
 109        .probe          = adt7310_spi_probe,
 110        .remove         = adt7310_spi_remove,
 111        .id_table       = adt7310_id,
 112};
 113module_spi_driver(adt7310_driver);
 114
 115MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 116MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
 117MODULE_LICENSE("GPL");
 118