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
  26 static 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
  42 static 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
  49 static 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
  60 static 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
  67 static 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
  79 static 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
  86 static 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
  92 static int adt7310_spi_remove(struct spi_device *spi)
  93 {
  94         return adt7x10_remove(&spi->dev, spi->irq);
  95 }
  96
  97 static const struct spi_device_id adt7310_id[] = {
  98         { "adt7310", 0 },
  99         { "adt7320", 0 },
 100         {}
 101 };
 102 MODULE_DEVICE_TABLE(spi, adt7310_id);
 103
 104 static 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 };
 113 module_spi_driver(adt7310_driver);
 114
 115 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 116 MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
 117 MODULE_LICENSE("GPL");