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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gpio-max7300.c (1821B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2009 Wolfram Sang, Pengutronix
      4 *
      5 * Check max730x.c for further details.
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/init.h>
     10#include <linux/platform_device.h>
     11#include <linux/mutex.h>
     12#include <linux/i2c.h>
     13#include <linux/spi/max7301.h>
     14#include <linux/slab.h>
     15
     16static int max7300_i2c_write(struct device *dev, unsigned int reg,
     17				unsigned int val)
     18{
     19	struct i2c_client *client = to_i2c_client(dev);
     20
     21	return i2c_smbus_write_byte_data(client, reg, val);
     22}
     23
     24static int max7300_i2c_read(struct device *dev, unsigned int reg)
     25{
     26	struct i2c_client *client = to_i2c_client(dev);
     27
     28	return i2c_smbus_read_byte_data(client, reg);
     29}
     30
     31static int max7300_probe(struct i2c_client *client,
     32			 const struct i2c_device_id *id)
     33{
     34	struct max7301 *ts;
     35
     36	if (!i2c_check_functionality(client->adapter,
     37			I2C_FUNC_SMBUS_BYTE_DATA))
     38		return -EIO;
     39
     40	ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
     41	if (!ts)
     42		return -ENOMEM;
     43
     44	ts->read = max7300_i2c_read;
     45	ts->write = max7300_i2c_write;
     46	ts->dev = &client->dev;
     47
     48	return __max730x_probe(ts);
     49}
     50
     51static int max7300_remove(struct i2c_client *client)
     52{
     53	__max730x_remove(&client->dev);
     54
     55	return 0;
     56}
     57
     58static const struct i2c_device_id max7300_id[] = {
     59	{ "max7300", 0 },
     60	{ }
     61};
     62MODULE_DEVICE_TABLE(i2c, max7300_id);
     63
     64static struct i2c_driver max7300_driver = {
     65	.driver = {
     66		.name = "max7300",
     67	},
     68	.probe = max7300_probe,
     69	.remove = max7300_remove,
     70	.id_table = max7300_id,
     71};
     72
     73static int __init max7300_init(void)
     74{
     75	return i2c_add_driver(&max7300_driver);
     76}
     77subsys_initcall(max7300_init);
     78
     79static void __exit max7300_exit(void)
     80{
     81	i2c_del_driver(&max7300_driver);
     82}
     83module_exit(max7300_exit);
     84
     85MODULE_AUTHOR("Wolfram Sang");
     86MODULE_LICENSE("GPL v2");
     87MODULE_DESCRIPTION("MAX7300 GPIO-Expander");