xref: /openbmc/linux/drivers/mfd/wm831x-i2c.c (revision 4e57d142)
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