1// SPDX-License-Identifier: GPL-2.0-only
2/* MCP23S08 I2C GPIO driver */
3
4#include <linux/i2c.h>
5#include <linux/mod_devicetable.h>
6#include <linux/module.h>
7#include <linux/regmap.h>
8
9#include "pinctrl-mcp23s08.h"
10
11static int mcp230xx_probe(struct i2c_client *client)
12{
13	const struct mcp23s08_info *info;
14	struct device *dev = &client->dev;
15	struct mcp23s08 *mcp;
16	int ret;
17
18	mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
19	if (!mcp)
20		return -ENOMEM;
21
22	info = i2c_get_match_data(client);
23	if (!info)
24		return dev_err_probe(dev, -EINVAL, "invalid device type\n");
25
26	mcp->reg_shift = info->reg_shift;
27	mcp->chip.ngpio = info->ngpio;
28	mcp->chip.label = info->label;
29	mcp->regmap = devm_regmap_init_i2c(client, info->regmap);
30	if (IS_ERR(mcp->regmap))
31		return PTR_ERR(mcp->regmap);
32
33	mcp->irq = client->irq;
34	mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
35
36	ret = mcp23s08_probe_one(mcp, dev, client->addr, info->type, -1);
37	if (ret)
38		return ret;
39
40	i2c_set_clientdata(client, mcp);
41
42	return 0;
43}
44
45static const struct mcp23s08_info mcp23008_i2c = {
46	.regmap = &mcp23x08_regmap,
47	.label = "mcp23008",
48	.type = MCP_TYPE_008,
49	.ngpio = 8,
50	.reg_shift = 0,
51};
52
53static const struct mcp23s08_info mcp23017_i2c = {
54	.regmap = &mcp23x17_regmap,
55	.label = "mcp23017",
56	.type = MCP_TYPE_017,
57	.ngpio = 16,
58	.reg_shift = 1,
59};
60
61static const struct mcp23s08_info  mcp23018_i2c = {
62	.regmap = &mcp23x17_regmap,
63	.label = "mcp23018",
64	.type = MCP_TYPE_018,
65	.ngpio = 16,
66	.reg_shift = 1,
67};
68
69static const struct i2c_device_id mcp230xx_id[] = {
70	{ "mcp23008", (kernel_ulong_t)&mcp23008_i2c },
71	{ "mcp23017", (kernel_ulong_t)&mcp23017_i2c },
72	{ "mcp23018", (kernel_ulong_t)&mcp23018_i2c },
73	{ }
74};
75MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
76
77static const struct of_device_id mcp23s08_i2c_of_match[] = {
78	{ .compatible = "microchip,mcp23008", .data = &mcp23008_i2c },
79	{ .compatible = "microchip,mcp23017", .data = &mcp23017_i2c },
80	{ .compatible = "microchip,mcp23018", .data = &mcp23018_i2c },
81/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
82	{ .compatible = "mcp,mcp23008", .data = &mcp23008_i2c },
83	{ .compatible = "mcp,mcp23017", .data = &mcp23017_i2c },
84	{ }
85};
86MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
87
88static struct i2c_driver mcp230xx_driver = {
89	.driver = {
90		.name	= "mcp230xx",
91		.of_match_table = mcp23s08_i2c_of_match,
92	},
93	.probe		= mcp230xx_probe,
94	.id_table	= mcp230xx_id,
95};
96
97static int __init mcp23s08_i2c_init(void)
98{
99	return i2c_add_driver(&mcp230xx_driver);
100}
101
102/*
103 * Register after I��C postcore initcall and before
104 * subsys initcalls that may rely on these GPIOs.
105 */
106subsys_initcall(mcp23s08_i2c_init);
107
108static void mcp23s08_i2c_exit(void)
109{
110	i2c_del_driver(&mcp230xx_driver);
111}
112module_exit(mcp23s08_i2c_exit);
113
114MODULE_LICENSE("GPL");
115