drivers/hwmon/adt7410.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ADT7410/ADT7420 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/i2c.h>
  12 #include <linux/regmap.h>
  13
  14 #include "adt7x10.h"
  15
  16 static bool adt7410_regmap_is_volatile(struct device *dev, unsigned int reg)
  17 {
  18         switch (reg) {
  19         case ADT7X10_TEMPERATURE:
  20         case ADT7X10_STATUS:
  21                 return true;
  22         default:
  23                 return false;
  24         }
  25 }
  26
  27 static int adt7410_reg_read(void *context, unsigned int reg, unsigned int *val)
  28 {
  29         struct i2c_client *client = context;
  30         int regval;
  31
  32         switch (reg) {
  33         case ADT7X10_TEMPERATURE:
  34         case ADT7X10_T_ALARM_HIGH:
  35         case ADT7X10_T_ALARM_LOW:
  36         case ADT7X10_T_CRIT:
  37                 regval = i2c_smbus_read_word_swapped(client, reg);
  38                 break;
  39         default:
  40                 regval = i2c_smbus_read_byte_data(client, reg);
  41                 break;
  42         }
  43         if (regval < 0)
  44                 return regval;
  45         *val = regval;
  46         return 0;
  47 }
  48
  49 static int adt7410_reg_write(void *context, unsigned int reg, unsigned int val)
  50 {
  51         struct i2c_client *client = context;
  52         int ret;
  53
  54         switch (reg) {
  55         case ADT7X10_TEMPERATURE:
  56         case ADT7X10_T_ALARM_HIGH:
  57         case ADT7X10_T_ALARM_LOW:
  58         case ADT7X10_T_CRIT:
  59                 ret = i2c_smbus_write_word_swapped(client, reg, val);
  60                 break;
  61         default:
  62                 ret = i2c_smbus_write_byte_data(client, reg, val);
  63                 break;
  64         }
  65         return ret;
  66 }
  67
  68 static const struct regmap_config adt7410_regmap_config = {
  69         .reg_bits = 8,
  70         .val_bits = 16,
  71         .max_register = ADT7X10_ID,
  72         .cache_type = REGCACHE_MAPLE,
  73         .volatile_reg = adt7410_regmap_is_volatile,
  74         .reg_read = adt7410_reg_read,
  75         .reg_write = adt7410_reg_write,
  76 };
  77
  78 static int adt7410_i2c_probe(struct i2c_client *client)
  79 {
  80         struct regmap *regmap;
  81
  82         regmap = devm_regmap_init(&client->dev, NULL, client,
  83                                   &adt7410_regmap_config);
  84         if (IS_ERR(regmap))
  85                 return PTR_ERR(regmap);
  86
  87         return adt7x10_probe(&client->dev, client->name, client->irq, regmap);
  88 }
  89
  90 static const struct i2c_device_id adt7410_ids[] = {
  91         { "adt7410" },
  92         { "adt7420" },
  93         {}
  94 };
  95 MODULE_DEVICE_TABLE(i2c, adt7410_ids);
  96
  97 static struct i2c_driver adt7410_driver = {
  98         .driver = {
  99                 .name   = "adt7410",
 100                 .pm     = pm_sleep_ptr(&adt7x10_dev_pm_ops),
 101         },
 102         .probe          = adt7410_i2c_probe,
 103         .id_table       = adt7410_ids,
 104 };
 105 module_i2c_driver(adt7410_driver);
 106
 107 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 108 MODULE_DESCRIPTION("ADT7410/AD7420 driver");
 109 MODULE_LICENSE("GPL");