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 
mcp230xx_probe(struct i2c_client * client,const struct i2c_device_id * id)11 static 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 
64 static const struct i2c_device_id mcp230xx_id[] = {
65 	{ "mcp23008", MCP_TYPE_008 },
66 	{ "mcp23017", MCP_TYPE_017 },
67 	{ "mcp23018", MCP_TYPE_018 },
68 	{ }
69 };
70 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
71 
72 static 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 };
96 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
97 
98 static 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 
mcp23s08_i2c_init(void)107 static 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  */
116 subsys_initcall(mcp23s08_i2c_init);
117 
mcp23s08_i2c_exit(void)118 static void mcp23s08_i2c_exit(void)
119 {
120 	i2c_del_driver(&mcp230xx_driver);
121 }
122 module_exit(mcp23s08_i2c_exit);
123 
124 MODULE_LICENSE("GPL");
125