cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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adt7410.c (2481B)

      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
     16static 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
     27static 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
     49static 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
     68static const struct regmap_config adt7410_regmap_config = {
     69	.reg_bits = 8,
     70	.val_bits = 16,
     71	.max_register = ADT7X10_ID,
     72	.cache_type = REGCACHE_RBTREE,
     73	.volatile_reg = adt7410_regmap_is_volatile,
     74	.reg_read = adt7410_reg_read,
     75	.reg_write = adt7410_reg_write,
     76};
     77
     78static 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
     90static const struct i2c_device_id adt7410_ids[] = {
     91	{ "adt7410", 0 },
     92	{ "adt7420", 0 },
     93	{}
     94};
     95MODULE_DEVICE_TABLE(i2c, adt7410_ids);
     96
     97static struct i2c_driver adt7410_driver = {
     98	.class		= I2C_CLASS_HWMON,
     99	.driver = {
    100		.name	= "adt7410",
    101		.pm	= ADT7X10_DEV_PM_OPS,
    102	},
    103	.probe_new	= adt7410_i2c_probe,
    104	.id_table	= adt7410_ids,
    105	.address_list	= I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b),
    106};
    107module_i2c_driver(adt7410_driver);
    108
    109MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
    110MODULE_DESCRIPTION("ADT7410/AD7420 driver");
    111MODULE_LICENSE("GPL");