Merge tag 'for-linus-6.1-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/kernel/linux-starfive.git] / drivers / gpio / gpio-max7300.c
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
16 static 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
24 static 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
31 static 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
51 static void max7300_remove(struct i2c_client *client)
52 {
53         __max730x_remove(&client->dev);
54 }
55
56 static const struct i2c_device_id max7300_id[] = {
57         { "max7300", 0 },
58         { }
59 };
60 MODULE_DEVICE_TABLE(i2c, max7300_id);
61
62 static 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
71 static int __init max7300_init(void)
72 {
73         return i2c_add_driver(&max7300_driver);
74 }
75 subsys_initcall(max7300_init);
76
77 static void __exit max7300_exit(void)
78 {
79         i2c_del_driver(&max7300_driver);
80 }
81 module_exit(max7300_exit);
82
83 MODULE_AUTHOR("Wolfram Sang");
84 MODULE_LICENSE("GPL v2");
85 MODULE_DESCRIPTION("MAX7300 GPIO-Expander");