drivers/hwmon/adt7310.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ADT7310/ADT7310 digital temperature sensor driver
   4  *
   5  * Copyright 2012-2013 Analog Devices Inc.
   6  *   Author: Lars-Peter Clausen <lars@metafoo.de>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/spi/spi.h>
  12 #include <asm/unaligned.h>
  13
  14 #include "adt7x10.h"
  15
  16 #define ADT7310_STATUS                  0
  17 #define ADT7310_CONFIG                  1
  18 #define ADT7310_TEMPERATURE             2
  19 #define ADT7310_ID                      3
  20 #define ADT7310_T_CRIT                  4
  21 #define ADT7310_T_HYST                  5
  22 #define ADT7310_T_ALARM_HIGH            6
  23 #define ADT7310_T_ALARM_LOW             7
  24
  25 static const u8 adt7310_reg_table[] = {
  26         [ADT7X10_TEMPERATURE]   = ADT7310_TEMPERATURE,
  27         [ADT7X10_STATUS]        = ADT7310_STATUS,
  28         [ADT7X10_CONFIG]        = ADT7310_CONFIG,
  29         [ADT7X10_T_ALARM_HIGH]  = ADT7310_T_ALARM_HIGH,
  30         [ADT7X10_T_ALARM_LOW]   = ADT7310_T_ALARM_LOW,
  31         [ADT7X10_T_CRIT]        = ADT7310_T_CRIT,
  32         [ADT7X10_T_HYST]        = ADT7310_T_HYST,
  33         [ADT7X10_ID]            = ADT7310_ID,
  34 };
  35
  36 #define ADT7310_CMD_REG_OFFSET  3
  37 #define ADT7310_CMD_READ        0x40
  38
  39 #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
  40
  41 static int adt7310_spi_read_word(struct device *dev, u8 reg)
  42 {
  43         struct spi_device *spi = to_spi_device(dev);
  44
  45         return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  46 }
  47
  48 static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
  49 {
  50         struct spi_device *spi = to_spi_device(dev);
  51         u8 buf[3];
  52
  53         buf[0] = AD7310_COMMAND(reg);
  54         put_unaligned_be16(data, &buf[1]);
  55
  56         return spi_write(spi, buf, sizeof(buf));
  57 }
  58
  59 static int adt7310_spi_read_byte(struct device *dev, u8 reg)
  60 {
  61         struct spi_device *spi = to_spi_device(dev);
  62
  63         return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  64 }
  65
  66 static int adt7310_spi_write_byte(struct device *dev, u8 reg,
  67         u8 data)
  68 {
  69         struct spi_device *spi = to_spi_device(dev);
  70         u8 buf[2];
  71
  72         buf[0] = AD7310_COMMAND(reg);
  73         buf[1] = data;
  74
  75         return spi_write(spi, buf, sizeof(buf));
  76 }
  77
  78 static const struct adt7x10_ops adt7310_spi_ops = {
  79         .read_word = adt7310_spi_read_word,
  80         .write_word = adt7310_spi_write_word,
  81         .read_byte = adt7310_spi_read_byte,
  82         .write_byte = adt7310_spi_write_byte,
  83 };
  84
  85 static int adt7310_spi_probe(struct spi_device *spi)
  86 {
  87         return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
  88                         &adt7310_spi_ops);
  89 }
  90
  91 static int adt7310_spi_remove(struct spi_device *spi)
  92 {
  93         return adt7x10_remove(&spi->dev, spi->irq);
  94 }
  95
  96 static const struct spi_device_id adt7310_id[] = {
  97         { "adt7310", 0 },
  98         { "adt7320", 0 },
  99         {}
 100 };
 101 MODULE_DEVICE_TABLE(spi, adt7310_id);
 102
 103 static struct spi_driver adt7310_driver = {
 104         .driver = {
 105                 .name   = "adt7310",
 106                 .pm     = ADT7X10_DEV_PM_OPS,
 107         },
 108         .probe          = adt7310_spi_probe,
 109         .remove         = adt7310_spi_remove,
 110         .id_table       = adt7310_id,
 111 };
 112 module_spi_driver(adt7310_driver);
 113
 114 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 115 MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
 116 MODULE_LICENSE("GPL");