Merge tag 'drm-msm-next-2023-08-20' of https://gitlab.freedesktop.org/drm/msm into...
[platform/kernel/linux-rpi.git] / drivers / pinctrl / pinctrl-mcp23s08_i2c.c
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
11 static 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
65 static const struct i2c_device_id mcp230xx_id[] = {
66         { "mcp23008", MCP_TYPE_008 },
67         { "mcp23017", MCP_TYPE_017 },
68         { "mcp23018", MCP_TYPE_018 },
69         { }
70 };
71 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
72
73 static 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 };
97 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
98
99 static 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
108 static 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  */
117 subsys_initcall(mcp23s08_i2c_init);
118
119 static void mcp23s08_i2c_exit(void)
120 {
121         i2c_del_driver(&mcp230xx_driver);
122 }
123 module_exit(mcp23s08_i2c_exit);
124
125 MODULE_LICENSE("GPL");