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

source code of linux/drivers/mfd/wm831x-spi.c