1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2009 Wolfram Sang, Pengutronix
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Check max730x.c for further details.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/init.h>
10*4882a593Smuzhiyun #include <linux/platform_device.h>
11*4882a593Smuzhiyun #include <linux/mutex.h>
12*4882a593Smuzhiyun #include <linux/i2c.h>
13*4882a593Smuzhiyun #include <linux/spi/max7301.h>
14*4882a593Smuzhiyun #include <linux/slab.h>
15*4882a593Smuzhiyun
max7300_i2c_write(struct device * dev,unsigned int reg,unsigned int val)16*4882a593Smuzhiyun static int max7300_i2c_write(struct device *dev, unsigned int reg,
17*4882a593Smuzhiyun unsigned int val)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun struct i2c_client *client = to_i2c_client(dev);
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun return i2c_smbus_write_byte_data(client, reg, val);
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
max7300_i2c_read(struct device * dev,unsigned int reg)24*4882a593Smuzhiyun static int max7300_i2c_read(struct device *dev, unsigned int reg)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun struct i2c_client *client = to_i2c_client(dev);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun return i2c_smbus_read_byte_data(client, reg);
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
max7300_probe(struct i2c_client * client,const struct i2c_device_id * id)31*4882a593Smuzhiyun static int max7300_probe(struct i2c_client *client,
32*4882a593Smuzhiyun const struct i2c_device_id *id)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun struct max7301 *ts;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun if (!i2c_check_functionality(client->adapter,
37*4882a593Smuzhiyun I2C_FUNC_SMBUS_BYTE_DATA))
38*4882a593Smuzhiyun return -EIO;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
41*4882a593Smuzhiyun if (!ts)
42*4882a593Smuzhiyun return -ENOMEM;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun ts->read = max7300_i2c_read;
45*4882a593Smuzhiyun ts->write = max7300_i2c_write;
46*4882a593Smuzhiyun ts->dev = &client->dev;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return __max730x_probe(ts);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
max7300_remove(struct i2c_client * client)51*4882a593Smuzhiyun static int max7300_remove(struct i2c_client *client)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun return __max730x_remove(&client->dev);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun static const struct i2c_device_id max7300_id[] = {
57*4882a593Smuzhiyun { "max7300", 0 },
58*4882a593Smuzhiyun { }
59*4882a593Smuzhiyun };
60*4882a593Smuzhiyun MODULE_DEVICE_TABLE(i2c, max7300_id);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun static struct i2c_driver max7300_driver = {
63*4882a593Smuzhiyun .driver = {
64*4882a593Smuzhiyun .name = "max7300",
65*4882a593Smuzhiyun },
66*4882a593Smuzhiyun .probe = max7300_probe,
67*4882a593Smuzhiyun .remove = max7300_remove,
68*4882a593Smuzhiyun .id_table = max7300_id,
69*4882a593Smuzhiyun };
70*4882a593Smuzhiyun
max7300_init(void)71*4882a593Smuzhiyun static int __init max7300_init(void)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun return i2c_add_driver(&max7300_driver);
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun subsys_initcall(max7300_init);
76*4882a593Smuzhiyun
max7300_exit(void)77*4882a593Smuzhiyun static void __exit max7300_exit(void)
78*4882a593Smuzhiyun {
79*4882a593Smuzhiyun i2c_del_driver(&max7300_driver);
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun module_exit(max7300_exit);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun MODULE_AUTHOR("Wolfram Sang");
84*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
85*4882a593Smuzhiyun MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
86