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, command: reg, value: 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, command: reg); |
29 | } |
30 | |
31 | static int max7300_probe(struct i2c_client *client) |
32 | { |
33 | struct max7301 *ts; |
34 | |
35 | if (!i2c_check_functionality(adap: client->adapter, |
36 | I2C_FUNC_SMBUS_BYTE_DATA)) |
37 | return -EIO; |
38 | |
39 | ts = devm_kzalloc(dev: &client->dev, size: sizeof(struct max7301), GFP_KERNEL); |
40 | if (!ts) |
41 | return -ENOMEM; |
42 | |
43 | ts->read = max7300_i2c_read; |
44 | ts->write = max7300_i2c_write; |
45 | ts->dev = &client->dev; |
46 | |
47 | return __max730x_probe(ts); |
48 | } |
49 | |
50 | static void max7300_remove(struct i2c_client *client) |
51 | { |
52 | __max730x_remove(dev: &client->dev); |
53 | } |
54 | |
55 | static const struct i2c_device_id max7300_id[] = { |
56 | { "max7300" , 0 }, |
57 | { } |
58 | }; |
59 | MODULE_DEVICE_TABLE(i2c, max7300_id); |
60 | |
61 | static struct i2c_driver max7300_driver = { |
62 | .driver = { |
63 | .name = "max7300" , |
64 | }, |
65 | .probe = max7300_probe, |
66 | .remove = max7300_remove, |
67 | .id_table = max7300_id, |
68 | }; |
69 | |
70 | static int __init max7300_init(void) |
71 | { |
72 | return i2c_add_driver(&max7300_driver); |
73 | } |
74 | subsys_initcall(max7300_init); |
75 | |
76 | static void __exit max7300_exit(void) |
77 | { |
78 | i2c_del_driver(driver: &max7300_driver); |
79 | } |
80 | module_exit(max7300_exit); |
81 | |
82 | MODULE_AUTHOR("Wolfram Sang" ); |
83 | MODULE_LICENSE("GPL v2" ); |
84 | MODULE_DESCRIPTION("MAX7300 GPIO-Expander" ); |
85 | |