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	return __max730x_remove(&client->dev);
54}
55
56static const struct i2c_device_id max7300_id[] = {
57	{ "max7300", 0 },
58	{ }
59};
60MODULE_DEVICE_TABLE(i2c, max7300_id);
61
62static struct i2c_driver max7300_driver = {
63	.driver = {
64		.name = "max7300",
65	},
66	.probe = max7300_probe,
67	.remove = max7300_remove,
68	.id_table = max7300_id,
69};
70
71static int __init max7300_init(void)
72{
73	return i2c_add_driver(&max7300_driver);
74}
75subsys_initcall(max7300_init);
76
77static void __exit max7300_exit(void)
78{
79	i2c_del_driver(&max7300_driver);
80}
81module_exit(max7300_exit);
82
83MODULE_AUTHOR("Wolfram Sang");
84MODULE_LICENSE("GPL v2");
85MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
86