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
24static 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
66static 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
73static 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
82static 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
93static const struct dev_pm_ops wm831x_pm_ops = {
94	.suspend = wm831x_i2c_suspend,
95	.poweroff = wm831x_i2c_poweroff,
96};
97
98static 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
109static 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}
119subsys_initcall(wm831x_i2c_init);
120