1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * wm831x-spi.c -- SPI 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/of.h>
13*4882a593Smuzhiyun #include <linux/of_device.h>
14*4882a593Smuzhiyun #include <linux/pm.h>
15*4882a593Smuzhiyun #include <linux/spi/spi.h>
16*4882a593Smuzhiyun #include <linux/regmap.h>
17*4882a593Smuzhiyun #include <linux/err.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <linux/mfd/wm831x/core.h>
20*4882a593Smuzhiyun
wm831x_spi_probe(struct spi_device * spi)21*4882a593Smuzhiyun static int wm831x_spi_probe(struct spi_device *spi)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
24*4882a593Smuzhiyun const struct spi_device_id *id = spi_get_device_id(spi);
25*4882a593Smuzhiyun const struct of_device_id *of_id;
26*4882a593Smuzhiyun struct wm831x *wm831x;
27*4882a593Smuzhiyun enum wm831x_parent type;
28*4882a593Smuzhiyun int ret;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun if (spi->dev.of_node) {
31*4882a593Smuzhiyun of_id = of_match_device(wm831x_of_match, &spi->dev);
32*4882a593Smuzhiyun if (!of_id) {
33*4882a593Smuzhiyun dev_err(&spi->dev, "Failed to match device\n");
34*4882a593Smuzhiyun return -ENODEV;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun type = (enum wm831x_parent)of_id->data;
37*4882a593Smuzhiyun } else {
38*4882a593Smuzhiyun type = (enum wm831x_parent)id->driver_data;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
42*4882a593Smuzhiyun if (wm831x == NULL)
43*4882a593Smuzhiyun return -ENOMEM;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun spi->mode = SPI_MODE_0;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun spi_set_drvdata(spi, wm831x);
48*4882a593Smuzhiyun wm831x->dev = &spi->dev;
49*4882a593Smuzhiyun wm831x->type = type;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
52*4882a593Smuzhiyun if (IS_ERR(wm831x->regmap)) {
53*4882a593Smuzhiyun ret = PTR_ERR(wm831x->regmap);
54*4882a593Smuzhiyun dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
55*4882a593Smuzhiyun ret);
56*4882a593Smuzhiyun return ret;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun if (pdata)
60*4882a593Smuzhiyun memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun return wm831x_device_init(wm831x, spi->irq);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
wm831x_spi_suspend(struct device * dev)65*4882a593Smuzhiyun static int wm831x_spi_suspend(struct device *dev)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun struct wm831x *wm831x = dev_get_drvdata(dev);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun return wm831x_device_suspend(wm831x);
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
wm831x_spi_poweroff(struct device * dev)72*4882a593Smuzhiyun static int wm831x_spi_poweroff(struct device *dev)
73*4882a593Smuzhiyun {
74*4882a593Smuzhiyun struct wm831x *wm831x = dev_get_drvdata(dev);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun wm831x_device_shutdown(wm831x);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun return 0;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static const struct dev_pm_ops wm831x_spi_pm = {
82*4882a593Smuzhiyun .freeze = wm831x_spi_suspend,
83*4882a593Smuzhiyun .suspend = wm831x_spi_suspend,
84*4882a593Smuzhiyun .poweroff = wm831x_spi_poweroff,
85*4882a593Smuzhiyun };
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun static const struct spi_device_id wm831x_spi_ids[] = {
88*4882a593Smuzhiyun { "wm8310", WM8310 },
89*4882a593Smuzhiyun { "wm8311", WM8311 },
90*4882a593Smuzhiyun { "wm8312", WM8312 },
91*4882a593Smuzhiyun { "wm8320", WM8320 },
92*4882a593Smuzhiyun { "wm8321", WM8321 },
93*4882a593Smuzhiyun { "wm8325", WM8325 },
94*4882a593Smuzhiyun { "wm8326", WM8326 },
95*4882a593Smuzhiyun { },
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun static struct spi_driver wm831x_spi_driver = {
99*4882a593Smuzhiyun .driver = {
100*4882a593Smuzhiyun .name = "wm831x",
101*4882a593Smuzhiyun .pm = &wm831x_spi_pm,
102*4882a593Smuzhiyun .of_match_table = of_match_ptr(wm831x_of_match),
103*4882a593Smuzhiyun .suppress_bind_attrs = true,
104*4882a593Smuzhiyun },
105*4882a593Smuzhiyun .id_table = wm831x_spi_ids,
106*4882a593Smuzhiyun .probe = wm831x_spi_probe,
107*4882a593Smuzhiyun };
108*4882a593Smuzhiyun
wm831x_spi_init(void)109*4882a593Smuzhiyun static int __init wm831x_spi_init(void)
110*4882a593Smuzhiyun {
111*4882a593Smuzhiyun int ret;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun ret = spi_register_driver(&wm831x_spi_driver);
114*4882a593Smuzhiyun if (ret != 0)
115*4882a593Smuzhiyun pr_err("Failed to register WM831x SPI driver: %d\n", ret);
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun return 0;
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun subsys_initcall(wm831x_spi_init);
120