1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs
4 *
5 * Copyright 2009,2010 Wolfson Microelectronics PLC.
6 *
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/i2c.h>
13 #include <linux/delay.h>
14 #include <linux/mfd/core.h>
15 #include <linux/slab.h>
16 #include <linux/err.h>
17 #include <linux/of.h>
18 #include <linux/of_device.h>
19 #include <linux/regmap.h>
20
21 #include <linux/mfd/wm831x/core.h>
22 #include <linux/mfd/wm831x/pdata.h>
23
wm831x_i2c_probe(struct i2c_client * i2c)24 static int wm831x_i2c_probe(struct i2c_client *i2c)
25 {
26 const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
27 struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
28 const struct of_device_id *of_id;
29 struct wm831x *wm831x;
30 enum wm831x_parent type;
31 int ret;
32
33 if (i2c->dev.of_node) {
34 of_id = of_match_device(wm831x_of_match, &i2c->dev);
35 if (!of_id) {
36 dev_err(&i2c->dev, "Failed to match device\n");
37 return -ENODEV;
38 }
39 type = (uintptr_t)of_id->data;
40 } else {
41 type = (enum wm831x_parent)id->driver_data;
42 }
43
44 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
45 if (wm831x == NULL)
46 return -ENOMEM;
47
48 i2c_set_clientdata(i2c, wm831x);
49 wm831x->dev = &i2c->dev;
50 wm831x->type = type;
51
52 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
53 if (IS_ERR(wm831x->regmap)) {
54 ret = PTR_ERR(wm831x->regmap);
55 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
56 ret);
57 return ret;
58 }
59
60 if (pdata)
61 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
62
63 return wm831x_device_init(wm831x, i2c->irq);
64 }
65
wm831x_i2c_suspend(struct device * dev)66 static int wm831x_i2c_suspend(struct device *dev)
67 {
68 struct wm831x *wm831x = dev_get_drvdata(dev);
69
70 return wm831x_device_suspend(wm831x);
71 }
72
wm831x_i2c_poweroff(struct device * dev)73 static int wm831x_i2c_poweroff(struct device *dev)
74 {
75 struct wm831x *wm831x = dev_get_drvdata(dev);
76
77 wm831x_device_shutdown(wm831x);
78
79 return 0;
80 }
81
82 static const struct i2c_device_id wm831x_i2c_id[] = {
83 { "wm8310", WM8310 },
84 { "wm8311", WM8311 },
85 { "wm8312", WM8312 },
86 { "wm8320", WM8320 },
87 { "wm8321", WM8321 },
88 { "wm8325", WM8325 },
89 { "wm8326", WM8326 },
90 { }
91 };
92
93 static const struct dev_pm_ops wm831x_pm_ops = {
94 .suspend = wm831x_i2c_suspend,
95 .poweroff = wm831x_i2c_poweroff,
96 };
97
98 static struct i2c_driver wm831x_i2c_driver = {
99 .driver = {
100 .name = "wm831x",
101 .pm = &wm831x_pm_ops,
102 .of_match_table = of_match_ptr(wm831x_of_match),
103 .suppress_bind_attrs = true,
104 },
105 .probe = wm831x_i2c_probe,
106 .id_table = wm831x_i2c_id,
107 };
108
wm831x_i2c_init(void)109 static int __init wm831x_i2c_init(void)
110 {
111 int ret;
112
113 ret = i2c_add_driver(&wm831x_i2c_driver);
114 if (ret != 0)
115 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
116
117 return ret;
118 }
119 subsys_initcall(wm831x_i2c_init);
120