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/regmap.h>
19
20 #include <linux/mfd/wm831x/core.h>
21 #include <linux/mfd/wm831x/pdata.h>
22
wm831x_i2c_probe(struct i2c_client * i2c)23 static int wm831x_i2c_probe(struct i2c_client *i2c)
24 {
25 struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
26 struct wm831x *wm831x;
27 enum wm831x_parent type;
28 int ret;
29
30 type = (uintptr_t)i2c_get_match_data(i2c);
31 if (!type) {
32 dev_err(&i2c->dev, "Failed to match device\n");
33 return -ENODEV;
34 }
35
36 wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
37 if (wm831x == NULL)
38 return -ENOMEM;
39
40 i2c_set_clientdata(i2c, wm831x);
41 wm831x->dev = &i2c->dev;
42 wm831x->type = type;
43
44 wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
45 if (IS_ERR(wm831x->regmap)) {
46 ret = PTR_ERR(wm831x->regmap);
47 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
48 ret);
49 return ret;
50 }
51
52 if (pdata)
53 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
54
55 return wm831x_device_init(wm831x, i2c->irq);
56 }
57
wm831x_i2c_suspend(struct device * dev)58 static int wm831x_i2c_suspend(struct device *dev)
59 {
60 struct wm831x *wm831x = dev_get_drvdata(dev);
61
62 return wm831x_device_suspend(wm831x);
63 }
64
wm831x_i2c_poweroff(struct device * dev)65 static int wm831x_i2c_poweroff(struct device *dev)
66 {
67 struct wm831x *wm831x = dev_get_drvdata(dev);
68
69 wm831x_device_shutdown(wm831x);
70
71 return 0;
72 }
73
74 static const struct i2c_device_id wm831x_i2c_id[] = {
75 { "wm8310", WM8310 },
76 { "wm8311", WM8311 },
77 { "wm8312", WM8312 },
78 { "wm8320", WM8320 },
79 { "wm8321", WM8321 },
80 { "wm8325", WM8325 },
81 { "wm8326", WM8326 },
82 { }
83 };
84
85 static const struct dev_pm_ops wm831x_pm_ops = {
86 .suspend = wm831x_i2c_suspend,
87 .poweroff = wm831x_i2c_poweroff,
88 };
89
90 static struct i2c_driver wm831x_i2c_driver = {
91 .driver = {
92 .name = "wm831x",
93 .pm = &wm831x_pm_ops,
94 .of_match_table = of_match_ptr(wm831x_of_match),
95 .suppress_bind_attrs = true,
96 },
97 .probe = wm831x_i2c_probe,
98 .id_table = wm831x_i2c_id,
99 };
100
wm831x_i2c_init(void)101 static int __init wm831x_i2c_init(void)
102 {
103 int ret;
104
105 ret = i2c_add_driver(&wm831x_i2c_driver);
106 if (ret != 0)
107 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
108
109 return ret;
110 }
111 subsys_initcall(wm831x_i2c_init);
112