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, const struct i2c_device_id *id)
12{
13	struct device *dev = &client->dev;
14	unsigned int type = id->driver_data;
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	switch (type) {
23	case MCP_TYPE_008:
24		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap);
25		mcp->reg_shift = 0;
26		mcp->chip.ngpio = 8;
27		mcp->chip.label = "mcp23008";
28		break;
29
30	case MCP_TYPE_017:
31		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
32		mcp->reg_shift = 1;
33		mcp->chip.ngpio = 16;
34		mcp->chip.label = "mcp23017";
35		break;
36
37	case MCP_TYPE_018:
38		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
39		mcp->reg_shift = 1;
40		mcp->chip.ngpio = 16;
41		mcp->chip.label = "mcp23018";
42		break;
43
44	default:
45		dev_err(dev, "invalid device type (%d)\n", type);
46		return -EINVAL;
47	}
48
49	if (IS_ERR(mcp->regmap))
50		return PTR_ERR(mcp->regmap);
51
52	mcp->irq = client->irq;
53	mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
54
55	ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1);
56	if (ret)
57		return ret;
58
59	i2c_set_clientdata(client, mcp);
60
61	return 0;
62}
63
64static const struct i2c_device_id mcp230xx_id[] = {
65	{ "mcp23008", MCP_TYPE_008 },
66	{ "mcp23017", MCP_TYPE_017 },
67	{ "mcp23018", MCP_TYPE_018 },
68	{ }
69};
70MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
71
72static const struct of_device_id mcp23s08_i2c_of_match[] = {
73	{
74		.compatible = "microchip,mcp23008",
75		.data = (void *) MCP_TYPE_008,
76	},
77	{
78		.compatible = "microchip,mcp23017",
79		.data = (void *) MCP_TYPE_017,
80	},
81	{
82		.compatible = "microchip,mcp23018",
83		.data = (void *) MCP_TYPE_018,
84	},
85/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
86	{
87		.compatible = "mcp,mcp23008",
88		.data = (void *) MCP_TYPE_008,
89	},
90	{
91		.compatible = "mcp,mcp23017",
92		.data = (void *) MCP_TYPE_017,
93	},
94	{ }
95};
96MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
97
98static struct i2c_driver mcp230xx_driver = {
99	.driver = {
100		.name	= "mcp230xx",
101		.of_match_table = mcp23s08_i2c_of_match,
102	},
103	.probe		= mcp230xx_probe,
104	.id_table	= mcp230xx_id,
105};
106
107static int __init mcp23s08_i2c_init(void)
108{
109	return i2c_add_driver(&mcp230xx_driver);
110}
111
112/*
113 * Register after I²C postcore initcall and before
114 * subsys initcalls that may rely on these GPIOs.
115 */
116subsys_initcall(mcp23s08_i2c_init);
117
118static void mcp23s08_i2c_exit(void)
119{
120	i2c_del_driver(&mcp230xx_driver);
121}
122module_exit(mcp23s08_i2c_exit);
123
124MODULE_LICENSE("GPL");
125