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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ad525x_dpot-i2c.c (2653B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Driver for the Analog Devices digital potentiometers (I2C bus)
      4 *
      5 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
      6 */
      7
      8#include <linux/i2c.h>
      9#include <linux/module.h>
     10
     11#include "ad525x_dpot.h"
     12
     13/* I2C bus functions */
     14static int write_d8(void *client, u8 val)
     15{
     16	return i2c_smbus_write_byte(client, val);
     17}
     18
     19static int write_r8d8(void *client, u8 reg, u8 val)
     20{
     21	return i2c_smbus_write_byte_data(client, reg, val);
     22}
     23
     24static int write_r8d16(void *client, u8 reg, u16 val)
     25{
     26	return i2c_smbus_write_word_data(client, reg, val);
     27}
     28
     29static int read_d8(void *client)
     30{
     31	return i2c_smbus_read_byte(client);
     32}
     33
     34static int read_r8d8(void *client, u8 reg)
     35{
     36	return i2c_smbus_read_byte_data(client, reg);
     37}
     38
     39static int read_r8d16(void *client, u8 reg)
     40{
     41	return i2c_smbus_read_word_data(client, reg);
     42}
     43
     44static const struct ad_dpot_bus_ops bops = {
     45	.read_d8	= read_d8,
     46	.read_r8d8	= read_r8d8,
     47	.read_r8d16	= read_r8d16,
     48	.write_d8	= write_d8,
     49	.write_r8d8	= write_r8d8,
     50	.write_r8d16	= write_r8d16,
     51};
     52
     53static int ad_dpot_i2c_probe(struct i2c_client *client,
     54				      const struct i2c_device_id *id)
     55{
     56	struct ad_dpot_bus_data bdata = {
     57		.client = client,
     58		.bops = &bops,
     59	};
     60
     61	if (!i2c_check_functionality(client->adapter,
     62				     I2C_FUNC_SMBUS_WORD_DATA)) {
     63		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
     64		return -EIO;
     65	}
     66
     67	return ad_dpot_probe(&client->dev, &bdata, id->driver_data, id->name);
     68}
     69
     70static int ad_dpot_i2c_remove(struct i2c_client *client)
     71{
     72	ad_dpot_remove(&client->dev);
     73	return 0;
     74}
     75
     76static const struct i2c_device_id ad_dpot_id[] = {
     77	{"ad5258", AD5258_ID},
     78	{"ad5259", AD5259_ID},
     79	{"ad5251", AD5251_ID},
     80	{"ad5252", AD5252_ID},
     81	{"ad5253", AD5253_ID},
     82	{"ad5254", AD5254_ID},
     83	{"ad5255", AD5255_ID},
     84	{"ad5241", AD5241_ID},
     85	{"ad5242", AD5242_ID},
     86	{"ad5243", AD5243_ID},
     87	{"ad5245", AD5245_ID},
     88	{"ad5246", AD5246_ID},
     89	{"ad5247", AD5247_ID},
     90	{"ad5248", AD5248_ID},
     91	{"ad5280", AD5280_ID},
     92	{"ad5282", AD5282_ID},
     93	{"adn2860", ADN2860_ID},
     94	{"ad5273", AD5273_ID},
     95	{"ad5161", AD5161_ID},
     96	{"ad5171", AD5171_ID},
     97	{"ad5170", AD5170_ID},
     98	{"ad5172", AD5172_ID},
     99	{"ad5173", AD5173_ID},
    100	{"ad5272", AD5272_ID},
    101	{"ad5274", AD5274_ID},
    102	{}
    103};
    104MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
    105
    106static struct i2c_driver ad_dpot_i2c_driver = {
    107	.driver = {
    108		.name	= "ad_dpot",
    109	},
    110	.probe		= ad_dpot_i2c_probe,
    111	.remove		= ad_dpot_i2c_remove,
    112	.id_table	= ad_dpot_id,
    113};
    114
    115module_i2c_driver(ad_dpot_i2c_driver);
    116
    117MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
    118MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
    119MODULE_LICENSE("GPL");