Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[platform/kernel/linux-starfive.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, 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
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
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");