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"); 110