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
max7300_i2c_write(struct device * dev,unsigned int reg,unsigned int val)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
max7300_i2c_read(struct device * dev,unsigned int reg)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
max7300_probe(struct i2c_client * client,const struct i2c_device_id * id)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
max7300_remove(struct i2c_client * client)51 static int max7300_remove(struct i2c_client *client)
52 {
53 return __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
max7300_init(void)71 static int __init max7300_init(void)
72 {
73 return i2c_add_driver(&max7300_driver);
74 }
75 subsys_initcall(max7300_init);
76
max7300_exit(void)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");
86