drivers/staging: make android timed_output.c explicitly non-modular
[deliverable/linux.git] / drivers / staging / android / timed_output.c
1 /* drivers/misc/timed_output.c
2 *
3 * Copyright (C) 2009 Google, Inc.
4 * Author: Mike Lockwood <lockwood@android.com>
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17 #define pr_fmt(fmt) "timed_output: " fmt
18
19 #include <linux/init.h>
20 #include <linux/export.h>
21 #include <linux/types.h>
22 #include <linux/device.h>
23 #include <linux/fs.h>
24 #include <linux/err.h>
25
26 #include "timed_output.h"
27
28 static struct class *timed_output_class;
29 static atomic_t device_count;
30
31 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
32 char *buf)
33 {
34 struct timed_output_dev *tdev = dev_get_drvdata(dev);
35 int remaining = tdev->get_time(tdev);
36
37 return sprintf(buf, "%d\n", remaining);
38 }
39
40 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
41 const char *buf, size_t size)
42 {
43 struct timed_output_dev *tdev = dev_get_drvdata(dev);
44 int value;
45 int rc;
46
47 rc = kstrtoint(buf, 0, &value);
48 if (rc != 0)
49 return -EINVAL;
50
51 tdev->enable(tdev, value);
52
53 return size;
54 }
55 static DEVICE_ATTR_RW(enable);
56
57 static struct attribute *timed_output_attrs[] = {
58 &dev_attr_enable.attr,
59 NULL,
60 };
61 ATTRIBUTE_GROUPS(timed_output);
62
63 static int create_timed_output_class(void)
64 {
65 if (!timed_output_class) {
66 timed_output_class = class_create(THIS_MODULE, "timed_output");
67 if (IS_ERR(timed_output_class))
68 return PTR_ERR(timed_output_class);
69 atomic_set(&device_count, 0);
70 timed_output_class->dev_groups = timed_output_groups;
71 }
72
73 return 0;
74 }
75
76 int timed_output_dev_register(struct timed_output_dev *tdev)
77 {
78 int ret;
79
80 if (!tdev || !tdev->name || !tdev->enable || !tdev->get_time)
81 return -EINVAL;
82
83 ret = create_timed_output_class();
84 if (ret < 0)
85 return ret;
86
87 tdev->index = atomic_inc_return(&device_count);
88 tdev->dev = device_create(timed_output_class, NULL,
89 MKDEV(0, tdev->index), NULL, "%s", tdev->name);
90 if (IS_ERR(tdev->dev))
91 return PTR_ERR(tdev->dev);
92
93 dev_set_drvdata(tdev->dev, tdev);
94 tdev->state = 0;
95 return 0;
96 }
97 EXPORT_SYMBOL_GPL(timed_output_dev_register);
98
99 void timed_output_dev_unregister(struct timed_output_dev *tdev)
100 {
101 tdev->enable(tdev, 0);
102 device_destroy(timed_output_class, MKDEV(0, tdev->index));
103 }
104 EXPORT_SYMBOL_GPL(timed_output_dev_unregister);
105
106 static int __init timed_output_init(void)
107 {
108 return create_timed_output_class();
109 }
110 device_initcall(timed_output_init);
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