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0f04a817 AS |
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 | ||
8bb58111 | 11 | static int mcp230xx_probe(struct i2c_client *client) |
0f04a817 | 12 | { |
8bb58111 | 13 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
0f04a817 AS |
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 | }, | |
d8572531 | 104 | .probe = mcp230xx_probe, |
0f04a817 AS |
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"); |