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 i2c_device_id *id = i2c_client_get_device_id(client);
14	struct device *dev = &client->dev;
15	unsigned int type = id->driver_data;
16	struct mcp23s08 *mcp;
17	int ret;
18
19	mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
20	if (!mcp)
21		return -ENOMEM;
22
23	switch (type) {
24	case MCP_TYPE_008:
25		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap);
26		mcp->reg_shift = 0;
27		mcp->chip.ngpio = 8;
28		mcp->chip.label = "mcp23008";
29		break;
30
31	case MCP_TYPE_017:
32		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
33		mcp->reg_shift = 1;
34		mcp->chip.ngpio = 16;
35		mcp->chip.label = "mcp23017";
36		break;
37
38	case MCP_TYPE_018:
39		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
40		mcp->reg_shift = 1;
41		mcp->chip.ngpio = 16;
42		mcp->chip.label = "mcp23018";
43		break;
44
45	default:
46		dev_err(dev, "invalid device type (%d)\n", type);
47		return -EINVAL;
48	}
49
50	if (IS_ERR(mcp->regmap))
51		return PTR_ERR(mcp->regmap);
52
53	mcp->irq = client->irq;
54	mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
55
56	ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1);
57	if (ret)
58		return ret;
59
60	i2c_set_clientdata(client, mcp);
61
62	return 0;
63}
64
65static const struct i2c_device_id mcp230xx_id[] = {
66	{ "mcp23008", MCP_TYPE_008 },
67	{ "mcp23017", MCP_TYPE_017 },
68	{ "mcp23018", MCP_TYPE_018 },
69	{ }
70};
71MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
72
73static const struct of_device_id mcp23s08_i2c_of_match[] = {
74	{
75		.compatible = "microchip,mcp23008",
76		.data = (void *) MCP_TYPE_008,
77	},
78	{
79		.compatible = "microchip,mcp23017",
80		.data = (void *) MCP_TYPE_017,
81	},
82	{
83		.compatible = "microchip,mcp23018",
84		.data = (void *) MCP_TYPE_018,
85	},
86/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
87	{
88		.compatible = "mcp,mcp23008",
89		.data = (void *) MCP_TYPE_008,
90	},
91	{
92		.compatible = "mcp,mcp23017",
93		.data = (void *) MCP_TYPE_017,
94	},
95	{ }
96};
97MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
98
99static struct i2c_driver mcp230xx_driver = {
100	.driver = {
101		.name	= "mcp230xx",
102		.of_match_table = mcp23s08_i2c_of_match,
103	},
104	.probe		= mcp230xx_probe,
105	.id_table	= mcp230xx_id,
106};
107
108static int __init mcp23s08_i2c_init(void)
109{
110	return i2c_add_driver(&mcp230xx_driver);
111}
112
113/*
114 * Register after I²C postcore initcall and before
115 * subsys initcalls that may rely on these GPIOs.
116 */
117subsys_initcall(mcp23s08_i2c_init);
118
119static void mcp23s08_i2c_exit(void)
120{
121	i2c_del_driver(&mcp230xx_driver);
122}
123module_exit(mcp23s08_i2c_exit);
124
125MODULE_LICENSE("GPL");
126