1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs
5 * Copyright 2009,2010 Wolfson Microelectronics PLC.
7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
13 #include <linux/of_device.h>
15 #include <linux/spi/spi.h>
16 #include <linux/regmap.h>
17 #include <linux/err.h>
19 #include <linux/mfd/wm831x/core.h>
21 static int wm831x_spi_probe(struct spi_device *spi)
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;
30 if (spi->dev.of_node) {
31 of_id = of_match_device(wm831x_of_match, &spi->dev);
33 dev_err(&spi->dev, "Failed to match device\n");
36 type = (enum wm831x_parent)of_id->data;
38 type = (enum wm831x_parent)id->driver_data;
41 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
45 spi->mode = SPI_MODE_0;
47 spi_set_drvdata(spi, wm831x);
48 wm831x->dev = &spi->dev;
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",
60 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
62 return wm831x_device_init(wm831x, spi->irq);
65 static int wm831x_spi_suspend(struct device *dev)
67 struct wm831x *wm831x = dev_get_drvdata(dev);
69 return wm831x_device_suspend(wm831x);
72 static int wm831x_spi_poweroff(struct device *dev)
74 struct wm831x *wm831x = dev_get_drvdata(dev);
76 wm831x_device_shutdown(wm831x);
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,
87 static const struct spi_device_id wm831x_spi_ids[] = {
98 static struct spi_driver wm831x_spi_driver = {
101 .pm = &wm831x_spi_pm,
102 .of_match_table = of_match_ptr(wm831x_of_match),
103 .suppress_bind_attrs = true,
105 .id_table = wm831x_spi_ids,
106 .probe = wm831x_spi_probe,
109 static int __init wm831x_spi_init(void)
113 ret = spi_register_driver(&wm831x_spi_driver);
115 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
119 subsys_initcall(wm831x_spi_init);