config: tegra3: enable /dev mount with ACL
[linux-2.6.git] / drivers / mfd / wm831x-spi.c
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
24 static int __devinit 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 = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
34         if (wm831x == NULL)
35                 return -ENOMEM;
36
37         spi->bits_per_word = 16;
38         spi->mode = SPI_MODE_0;
39
40         dev_set_drvdata(&spi->dev, wm831x);
41         wm831x->dev = &spi->dev;
42
43         wm831x->regmap = regmap_init_spi(spi, &wm831x_regmap_config);
44         if (IS_ERR(wm831x->regmap)) {
45                 ret = PTR_ERR(wm831x->regmap);
46                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
47                         ret);
48                 kfree(wm831x);
49                 return ret;
50         }
51
52         return wm831x_device_init(wm831x, type, spi->irq);
53 }
54
55 static int __devexit wm831x_spi_remove(struct spi_device *spi)
56 {
57         struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
58
59         wm831x_device_exit(wm831x);
60
61         return 0;
62 }
63
64 static int wm831x_spi_suspend(struct device *dev)
65 {
66         struct wm831x *wm831x = dev_get_drvdata(dev);
67
68         return wm831x_device_suspend(wm831x);
69 }
70
71 static void wm831x_spi_shutdown(struct spi_device *spi)
72 {
73         struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
74
75         wm831x_device_shutdown(wm831x);
76 }
77
78 static const struct dev_pm_ops wm831x_spi_pm = {
79         .freeze = wm831x_spi_suspend,
80         .suspend = wm831x_spi_suspend,
81 };
82
83 static const struct spi_device_id wm831x_spi_ids[] = {
84         { "wm8310", WM8310 },
85         { "wm8311", WM8311 },
86         { "wm8312", WM8312 },
87         { "wm8320", WM8320 },
88         { "wm8321", WM8321 },
89         { "wm8325", WM8325 },
90         { "wm8326", WM8326 },
91         { },
92 };
93 MODULE_DEVICE_TABLE(spi, wm831x_spi_id);
94
95 static struct spi_driver wm831x_spi_driver = {
96         .driver = {
97                 .name   = "wm831x",
98                 .bus    = &spi_bus_type,
99                 .owner  = THIS_MODULE,
100                 .pm     = &wm831x_spi_pm,
101         },
102         .id_table       = wm831x_spi_ids,
103         .probe          = wm831x_spi_probe,
104         .remove         = __devexit_p(wm831x_spi_remove),
105         .shutdown       = wm831x_spi_shutdown,
106 };
107
108 static int __init wm831x_spi_init(void)
109 {
110         int ret;
111
112         ret = spi_register_driver(&wm831x_spi_driver);
113         if (ret != 0)
114                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
115
116         return 0;
117 }
118 subsys_initcall(wm831x_spi_init);
119
120 static void __exit wm831x_spi_exit(void)
121 {
122         spi_unregister_driver(&wm831x_spi_driver);
123 }
124 module_exit(wm831x_spi_exit);
125
126 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
127 MODULE_LICENSE("GPL");
128 MODULE_AUTHOR("Mark Brown");