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
wm831x_spi_probe(struct spi_device * spi)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 = (uintptr_t)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
wm831x_spi_suspend(struct device * dev)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
wm831x_spi_poweroff(struct device * dev)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
wm831x_spi_init(void)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);
120