1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /* MCP23S08 I2C GPIO driver */
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #include <linux/i2c.h>
5*4882a593Smuzhiyun #include <linux/mod_devicetable.h>
6*4882a593Smuzhiyun #include <linux/module.h>
7*4882a593Smuzhiyun #include <linux/regmap.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include "pinctrl-mcp23s08.h"
10*4882a593Smuzhiyun
mcp230xx_probe(struct i2c_client * client,const struct i2c_device_id * id)11*4882a593Smuzhiyun static int mcp230xx_probe(struct i2c_client *client, const struct i2c_device_id *id)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun struct device *dev = &client->dev;
14*4882a593Smuzhiyun unsigned int type = id->driver_data;
15*4882a593Smuzhiyun struct mcp23s08 *mcp;
16*4882a593Smuzhiyun int ret;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
19*4882a593Smuzhiyun if (!mcp)
20*4882a593Smuzhiyun return -ENOMEM;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun switch (type) {
23*4882a593Smuzhiyun case MCP_TYPE_008:
24*4882a593Smuzhiyun mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap);
25*4882a593Smuzhiyun mcp->reg_shift = 0;
26*4882a593Smuzhiyun mcp->chip.ngpio = 8;
27*4882a593Smuzhiyun mcp->chip.label = "mcp23008";
28*4882a593Smuzhiyun break;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun case MCP_TYPE_017:
31*4882a593Smuzhiyun mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
32*4882a593Smuzhiyun mcp->reg_shift = 1;
33*4882a593Smuzhiyun mcp->chip.ngpio = 16;
34*4882a593Smuzhiyun mcp->chip.label = "mcp23017";
35*4882a593Smuzhiyun break;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun case MCP_TYPE_018:
38*4882a593Smuzhiyun mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
39*4882a593Smuzhiyun mcp->reg_shift = 1;
40*4882a593Smuzhiyun mcp->chip.ngpio = 16;
41*4882a593Smuzhiyun mcp->chip.label = "mcp23018";
42*4882a593Smuzhiyun break;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun default:
45*4882a593Smuzhiyun dev_err(dev, "invalid device type (%d)\n", type);
46*4882a593Smuzhiyun return -EINVAL;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun if (IS_ERR(mcp->regmap))
50*4882a593Smuzhiyun return PTR_ERR(mcp->regmap);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun mcp->irq = client->irq;
53*4882a593Smuzhiyun mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1);
56*4882a593Smuzhiyun if (ret)
57*4882a593Smuzhiyun return ret;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun i2c_set_clientdata(client, mcp);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun return 0;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun static const struct i2c_device_id mcp230xx_id[] = {
65*4882a593Smuzhiyun { "mcp23008", MCP_TYPE_008 },
66*4882a593Smuzhiyun { "mcp23017", MCP_TYPE_017 },
67*4882a593Smuzhiyun { "mcp23018", MCP_TYPE_018 },
68*4882a593Smuzhiyun { }
69*4882a593Smuzhiyun };
70*4882a593Smuzhiyun MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun static const struct of_device_id mcp23s08_i2c_of_match[] = {
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun .compatible = "microchip,mcp23008",
75*4882a593Smuzhiyun .data = (void *) MCP_TYPE_008,
76*4882a593Smuzhiyun },
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun .compatible = "microchip,mcp23017",
79*4882a593Smuzhiyun .data = (void *) MCP_TYPE_017,
80*4882a593Smuzhiyun },
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun .compatible = "microchip,mcp23018",
83*4882a593Smuzhiyun .data = (void *) MCP_TYPE_018,
84*4882a593Smuzhiyun },
85*4882a593Smuzhiyun /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun .compatible = "mcp,mcp23008",
88*4882a593Smuzhiyun .data = (void *) MCP_TYPE_008,
89*4882a593Smuzhiyun },
90*4882a593Smuzhiyun {
91*4882a593Smuzhiyun .compatible = "mcp,mcp23017",
92*4882a593Smuzhiyun .data = (void *) MCP_TYPE_017,
93*4882a593Smuzhiyun },
94*4882a593Smuzhiyun { }
95*4882a593Smuzhiyun };
96*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun static struct i2c_driver mcp230xx_driver = {
99*4882a593Smuzhiyun .driver = {
100*4882a593Smuzhiyun .name = "mcp230xx",
101*4882a593Smuzhiyun .of_match_table = mcp23s08_i2c_of_match,
102*4882a593Smuzhiyun },
103*4882a593Smuzhiyun .probe = mcp230xx_probe,
104*4882a593Smuzhiyun .id_table = mcp230xx_id,
105*4882a593Smuzhiyun };
106*4882a593Smuzhiyun
mcp23s08_i2c_init(void)107*4882a593Smuzhiyun static int __init mcp23s08_i2c_init(void)
108*4882a593Smuzhiyun {
109*4882a593Smuzhiyun return i2c_add_driver(&mcp230xx_driver);
110*4882a593Smuzhiyun }
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun /*
113*4882a593Smuzhiyun * Register after I²C postcore initcall and before
114*4882a593Smuzhiyun * subsys initcalls that may rely on these GPIOs.
115*4882a593Smuzhiyun */
116*4882a593Smuzhiyun subsys_initcall(mcp23s08_i2c_init);
117*4882a593Smuzhiyun
mcp23s08_i2c_exit(void)118*4882a593Smuzhiyun static void mcp23s08_i2c_exit(void)
119*4882a593Smuzhiyun {
120*4882a593Smuzhiyun i2c_del_driver(&mcp230xx_driver);
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun module_exit(mcp23s08_i2c_exit);
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun MODULE_LICENSE("GPL");
125