2 * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs
4 * Copyright 2009,2010 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
18 #include <linux/of_device.h>
20 #include <linux/spi/spi.h>
21 #include <linux/regmap.h>
22 #include <linux/err.h>
24 #include <linux/mfd/wm831x/core.h>
26 static int wm831x_spi_probe(struct spi_device *spi)
28 struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
29 const struct spi_device_id *id = spi_get_device_id(spi);
30 const struct of_device_id *of_id;
31 struct wm831x *wm831x;
32 enum wm831x_parent type;
35 if (spi->dev.of_node) {
36 of_id = of_match_device(wm831x_of_match, &spi->dev);
37 type = (enum wm831x_parent)of_id->data;
39 type = (enum wm831x_parent)id->driver_data;
42 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
46 spi->mode = SPI_MODE_0;
48 spi_set_drvdata(spi, wm831x);
49 wm831x->dev = &spi->dev;
52 wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
53 if (IS_ERR(wm831x->regmap)) {
54 ret = PTR_ERR(wm831x->regmap);
55 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
61 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
63 return wm831x_device_init(wm831x, spi->irq);
66 static int wm831x_spi_remove(struct spi_device *spi)
68 struct wm831x *wm831x = spi_get_drvdata(spi);
70 wm831x_device_exit(wm831x);
75 static int wm831x_spi_suspend(struct device *dev)
77 struct wm831x *wm831x = dev_get_drvdata(dev);
79 return wm831x_device_suspend(wm831x);
82 static int wm831x_spi_poweroff(struct device *dev)
84 struct wm831x *wm831x = dev_get_drvdata(dev);
86 wm831x_device_shutdown(wm831x);
91 static const struct dev_pm_ops wm831x_spi_pm = {
92 .freeze = wm831x_spi_suspend,
93 .suspend = wm831x_spi_suspend,
94 .poweroff = wm831x_spi_poweroff,
97 static const struct spi_device_id wm831x_spi_ids[] = {
100 { "wm8312", WM8312 },
101 { "wm8320", WM8320 },
102 { "wm8321", WM8321 },
103 { "wm8325", WM8325 },
104 { "wm8326", WM8326 },
107 MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
109 static struct spi_driver wm831x_spi_driver = {
112 .pm = &wm831x_spi_pm,
113 .of_match_table = of_match_ptr(wm831x_of_match),
115 .id_table = wm831x_spi_ids,
116 .probe = wm831x_spi_probe,
117 .remove = wm831x_spi_remove,
120 static int __init wm831x_spi_init(void)
124 ret = spi_register_driver(&wm831x_spi_driver);
126 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
130 subsys_initcall(wm831x_spi_init);
132 static void __exit wm831x_spi_exit(void)
134 spi_unregister_driver(&wm831x_spi_driver);
136 module_exit(wm831x_spi_exit);
138 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
139 MODULE_LICENSE("GPL");
140 MODULE_AUTHOR("Mark Brown");