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/of.h>
18#include <linux/of_device.h>
19#include <linux/pm.h>
20#include <linux/spi/spi.h>
21#include <linux/regmap.h>
22#include <linux/err.h>
23
24#include <linux/mfd/wm831x/core.h>
25
26static int wm831x_spi_probe(struct spi_device *spi)
27{
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;
33 int ret;
34
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;
38 } else {
39 type = (enum wm831x_parent)id->driver_data;
40 }
41
42 wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
43 if (wm831x == NULL)
44 return -ENOMEM;
45
46 spi->mode = SPI_MODE_0;
47
48 spi_set_drvdata(spi, wm831x);
49 wm831x->dev = &spi->dev;
50 wm831x->type = type;
51
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",
56 ret);
57 return ret;
58 }
59
60 if (pdata)
61 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
62
63 return wm831x_device_init(wm831x, spi->irq);
64}
65
66static int wm831x_spi_remove(struct spi_device *spi)
67{
68 struct wm831x *wm831x = spi_get_drvdata(spi);
69
70 wm831x_device_exit(wm831x);
71
72 return 0;
73}
74
75static int wm831x_spi_suspend(struct device *dev)
76{
77 struct wm831x *wm831x = dev_get_drvdata(dev);
78
79 return wm831x_device_suspend(wm831x);
80}
81
82static int wm831x_spi_poweroff(struct device *dev)
83{
84 struct wm831x *wm831x = dev_get_drvdata(dev);
85
86 wm831x_device_shutdown(wm831x);
87
88 return 0;
89}
90
91static const struct dev_pm_ops wm831x_spi_pm = {
92 .freeze = wm831x_spi_suspend,
93 .suspend = wm831x_spi_suspend,
94 .poweroff = wm831x_spi_poweroff,
95};
96
97static const struct spi_device_id wm831x_spi_ids[] = {
98 { "wm8310", WM8310 },
99 { "wm8311", WM8311 },
100 { "wm8312", WM8312 },
101 { "wm8320", WM8320 },
102 { "wm8321", WM8321 },
103 { "wm8325", WM8325 },
104 { "wm8326", WM8326 },
105 { },
106};
107MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
108
109static struct spi_driver wm831x_spi_driver = {
110 .driver = {
111 .name = "wm831x",
112 .pm = &wm831x_spi_pm,
113 .of_match_table = of_match_ptr(wm831x_of_match),
114 },
115 .id_table = wm831x_spi_ids,
116 .probe = wm831x_spi_probe,
117 .remove = wm831x_spi_remove,
118};
119
120static int __init wm831x_spi_init(void)
121{
122 int ret;
123
124 ret = spi_register_driver(&wm831x_spi_driver);
125 if (ret != 0)
126 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
127
128 return 0;
129}
130subsys_initcall(wm831x_spi_init);
131
132static void __exit wm831x_spi_exit(void)
133{
134 spi_unregister_driver(&wm831x_spi_driver);
135}
136module_exit(wm831x_spi_exit);
137
138MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
139MODULE_LICENSE("GPL");
140MODULE_AUTHOR("Mark Brown");