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         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
  54 static 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
  65 static 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
  72 static 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
  84 static 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
  91 static 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
  97 static int adt7310_spi_remove(struct spi_device *spi)
  98 {
  99         return adt7x10_remove(&spi->dev, spi->irq);
 100 }
 101
 102 static const struct spi_device_id adt7310_id[] = {
 103         { "adt7310", 0 },
 104         { "adt7320", 0 },
 105         {}
 106 };
 107 MODULE_DEVICE_TABLE(spi, adt7310_id);
 108
 109 static 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 };
 119 module_spi_driver(adt7310_driver);
 120
 121 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 122 MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
 123 MODULE_LICENSE("GPL");