1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2009,2010 Wolfson Microelectronics PLC.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <linux/i2c.h>
13*4882a593Smuzhiyun #include <linux/delay.h>
14*4882a593Smuzhiyun #include <linux/mfd/core.h>
15*4882a593Smuzhiyun #include <linux/slab.h>
16*4882a593Smuzhiyun #include <linux/err.h>
17*4882a593Smuzhiyun #include <linux/of.h>
18*4882a593Smuzhiyun #include <linux/of_device.h>
19*4882a593Smuzhiyun #include <linux/regmap.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include <linux/mfd/wm831x/core.h>
22*4882a593Smuzhiyun #include <linux/mfd/wm831x/pdata.h>
23*4882a593Smuzhiyun
wm831x_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)24*4882a593Smuzhiyun static int wm831x_i2c_probe(struct i2c_client *i2c,
25*4882a593Smuzhiyun const struct i2c_device_id *id)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
28*4882a593Smuzhiyun const struct of_device_id *of_id;
29*4882a593Smuzhiyun struct wm831x *wm831x;
30*4882a593Smuzhiyun enum wm831x_parent type;
31*4882a593Smuzhiyun int ret;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun if (i2c->dev.of_node) {
34*4882a593Smuzhiyun of_id = of_match_device(wm831x_of_match, &i2c->dev);
35*4882a593Smuzhiyun if (!of_id) {
36*4882a593Smuzhiyun dev_err(&i2c->dev, "Failed to match device\n");
37*4882a593Smuzhiyun return -ENODEV;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun type = (enum wm831x_parent)of_id->data;
40*4882a593Smuzhiyun } else {
41*4882a593Smuzhiyun type = (enum wm831x_parent)id->driver_data;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
45*4882a593Smuzhiyun if (wm831x == NULL)
46*4882a593Smuzhiyun return -ENOMEM;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun i2c_set_clientdata(i2c, wm831x);
49*4882a593Smuzhiyun wm831x->dev = &i2c->dev;
50*4882a593Smuzhiyun wm831x->type = type;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
53*4882a593Smuzhiyun if (IS_ERR(wm831x->regmap)) {
54*4882a593Smuzhiyun ret = PTR_ERR(wm831x->regmap);
55*4882a593Smuzhiyun dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
56*4882a593Smuzhiyun ret);
57*4882a593Smuzhiyun return ret;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (pdata)
61*4882a593Smuzhiyun memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun return wm831x_device_init(wm831x, i2c->irq);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
wm831x_i2c_suspend(struct device * dev)66*4882a593Smuzhiyun static int wm831x_i2c_suspend(struct device *dev)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun struct wm831x *wm831x = dev_get_drvdata(dev);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun return wm831x_device_suspend(wm831x);
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
wm831x_i2c_poweroff(struct device * dev)73*4882a593Smuzhiyun static int wm831x_i2c_poweroff(struct device *dev)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun struct wm831x *wm831x = dev_get_drvdata(dev);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun wm831x_device_shutdown(wm831x);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun return 0;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun static const struct i2c_device_id wm831x_i2c_id[] = {
83*4882a593Smuzhiyun { "wm8310", WM8310 },
84*4882a593Smuzhiyun { "wm8311", WM8311 },
85*4882a593Smuzhiyun { "wm8312", WM8312 },
86*4882a593Smuzhiyun { "wm8320", WM8320 },
87*4882a593Smuzhiyun { "wm8321", WM8321 },
88*4882a593Smuzhiyun { "wm8325", WM8325 },
89*4882a593Smuzhiyun { "wm8326", WM8326 },
90*4882a593Smuzhiyun { }
91*4882a593Smuzhiyun };
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun static const struct dev_pm_ops wm831x_pm_ops = {
94*4882a593Smuzhiyun .suspend = wm831x_i2c_suspend,
95*4882a593Smuzhiyun .poweroff = wm831x_i2c_poweroff,
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun static struct i2c_driver wm831x_i2c_driver = {
99*4882a593Smuzhiyun .driver = {
100*4882a593Smuzhiyun .name = "wm831x",
101*4882a593Smuzhiyun .pm = &wm831x_pm_ops,
102*4882a593Smuzhiyun .of_match_table = of_match_ptr(wm831x_of_match),
103*4882a593Smuzhiyun .suppress_bind_attrs = true,
104*4882a593Smuzhiyun },
105*4882a593Smuzhiyun .probe = wm831x_i2c_probe,
106*4882a593Smuzhiyun .id_table = wm831x_i2c_id,
107*4882a593Smuzhiyun };
108*4882a593Smuzhiyun
wm831x_i2c_init(void)109*4882a593Smuzhiyun static int __init wm831x_i2c_init(void)
110*4882a593Smuzhiyun {
111*4882a593Smuzhiyun int ret;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun ret = i2c_add_driver(&wm831x_i2c_driver);
114*4882a593Smuzhiyun if (ret != 0)
115*4882a593Smuzhiyun pr_err("Failed to register wm831x I2C driver: %d\n", ret);
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun return ret;
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun subsys_initcall(wm831x_i2c_init);
120