tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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");