GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / mfd / wm831x-spi.c
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/of_device.h>
14 #include <linux/pm.h>
15 #include <linux/spi/spi.h>
16 #include <linux/regmap.h>
17 #include <linux/err.h>
18
19 #include <linux/mfd/wm831x/core.h>
20
21 static int wm831x_spi_probe(struct spi_device *spi)
22 {
23         struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
24         const struct spi_device_id *id = spi_get_device_id(spi);
25         const struct of_device_id *of_id;
26         struct wm831x *wm831x;
27         enum wm831x_parent type;
28         int ret;
29
30         if (spi->dev.of_node) {
31                 of_id = of_match_device(wm831x_of_match, &spi->dev);
32                 if (!of_id) {
33                         dev_err(&spi->dev, "Failed to match device\n");
34                         return -ENODEV;
35                 }
36                 type = (enum wm831x_parent)of_id->data;
37         } else {
38                 type = (enum wm831x_parent)id->driver_data;
39         }
40
41         wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
42         if (wm831x == NULL)
43                 return -ENOMEM;
44
45         spi->mode = SPI_MODE_0;
46
47         spi_set_drvdata(spi, wm831x);
48         wm831x->dev = &spi->dev;
49         wm831x->type = type;
50
51         wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
52         if (IS_ERR(wm831x->regmap)) {
53                 ret = PTR_ERR(wm831x->regmap);
54                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
55                         ret);
56                 return ret;
57         }
58
59         if (pdata)
60                 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
61
62         return wm831x_device_init(wm831x, spi->irq);
63 }
64
65 static int wm831x_spi_suspend(struct device *dev)
66 {
67         struct wm831x *wm831x = dev_get_drvdata(dev);
68
69         return wm831x_device_suspend(wm831x);
70 }
71
72 static int wm831x_spi_poweroff(struct device *dev)
73 {
74         struct wm831x *wm831x = dev_get_drvdata(dev);
75
76         wm831x_device_shutdown(wm831x);
77
78         return 0;
79 }
80
81 static const struct dev_pm_ops wm831x_spi_pm = {
82         .freeze = wm831x_spi_suspend,
83         .suspend = wm831x_spi_suspend,
84         .poweroff = wm831x_spi_poweroff,
85 };
86
87 static const struct spi_device_id wm831x_spi_ids[] = {
88         { "wm8310", WM8310 },
89         { "wm8311", WM8311 },
90         { "wm8312", WM8312 },
91         { "wm8320", WM8320 },
92         { "wm8321", WM8321 },
93         { "wm8325", WM8325 },
94         { "wm8326", WM8326 },
95         { },
96 };
97
98 static struct spi_driver wm831x_spi_driver = {
99         .driver = {
100                 .name   = "wm831x",
101                 .pm     = &wm831x_spi_pm,
102                 .of_match_table = of_match_ptr(wm831x_of_match),
103                 .suppress_bind_attrs = true,
104         },
105         .id_table       = wm831x_spi_ids,
106         .probe          = wm831x_spi_probe,
107 };
108
109 static int __init wm831x_spi_init(void)
110 {
111         int ret;
112
113         ret = spi_register_driver(&wm831x_spi_driver);
114         if (ret != 0)
115                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
116
117         return 0;
118 }
119 subsys_initcall(wm831x_spi_init);