tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs
3 *
4 * Copyright 2009,2010 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
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.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/pm.h>
18#include <linux/spi/spi.h>
19#include <linux/regmap.h>
20#include <linux/err.h>
21
22#include <linux/mfd/wm831x/core.h>
23
24static int wm831x_spi_probe(struct spi_device *spi)
25{
26 const struct spi_device_id *id = spi_get_device_id(spi);
27 struct wm831x *wm831x;
28 enum wm831x_parent type;
29 int ret;
30
31 type = (enum wm831x_parent)id->driver_data;
32
33 wm831x = devm_kzalloc(&spi->dev, 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, wm831x);
40 wm831x->dev = &spi->dev;
41
42 wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
43 if (IS_ERR(wm831x->regmap)) {
44 ret = PTR_ERR(wm831x->regmap);
45 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
46 ret);
47 return ret;
48 }
49
50 return wm831x_device_init(wm831x, type, spi->irq);
51}
52
53static int wm831x_spi_remove(struct spi_device *spi)
54{
55 struct wm831x *wm831x = spi_get_drvdata(spi);
56
57 wm831x_device_exit(wm831x);
58
59 return 0;
60}
61
62static int wm831x_spi_suspend(struct device *dev)
63{
64 struct wm831x *wm831x = dev_get_drvdata(dev);
65
66 return wm831x_device_suspend(wm831x);
67}
68
69static void wm831x_spi_shutdown(struct spi_device *spi)
70{
71 struct wm831x *wm831x = spi_get_drvdata(spi);
72
73 wm831x_device_shutdown(wm831x);
74}
75
76static const struct dev_pm_ops wm831x_spi_pm = {
77 .freeze = wm831x_spi_suspend,
78 .suspend = wm831x_spi_suspend,
79};
80
81static const struct spi_device_id wm831x_spi_ids[] = {
82 { "wm8310", WM8310 },
83 { "wm8311", WM8311 },
84 { "wm8312", WM8312 },
85 { "wm8320", WM8320 },
86 { "wm8321", WM8321 },
87 { "wm8325", WM8325 },
88 { "wm8326", WM8326 },
89 { },
90};
91MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
92
93static struct spi_driver wm831x_spi_driver = {
94 .driver = {
95 .name = "wm831x",
96 .owner = THIS_MODULE,
97 .pm = &wm831x_spi_pm,
98 },
99 .id_table = wm831x_spi_ids,
100 .probe = wm831x_spi_probe,
101 .remove = wm831x_spi_remove,
102 .shutdown = wm831x_spi_shutdown,
103};
104
105static int __init wm831x_spi_init(void)
106{
107 int ret;
108
109 ret = spi_register_driver(&wm831x_spi_driver);
110 if (ret != 0)
111 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
112
113 return 0;
114}
115subsys_initcall(wm831x_spi_init);
116
117static void __exit wm831x_spi_exit(void)
118{
119 spi_unregister_driver(&wm831x_spi_driver);
120}
121module_exit(wm831x_spi_exit);
122
123MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
124MODULE_LICENSE("GPL");
125MODULE_AUTHOR("Mark Brown");