aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/output.c
blob: 1446c49fe6afff693797c08194e44bb377d6ae58 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/*
 *  output.c - Display Output Switch driver
 *
 *  Copyright (C) 2006 Luming Yu <luming.yu@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <linux/module.h>
#include <linux/video_output.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/ctype.h>


MODULE_DESCRIPTION("Display Output Switcher Lowlevel Control Abstraction");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Luming Yu <luming.yu@intel.com>");

static ssize_t state_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	ssize_t ret_size = 0;
	struct output_device *od = to_output_device(dev);
	if (od->props)
		ret_size = sprintf(buf,"%.8x\n",od->props->get_status(od));
	return ret_size;
}

static ssize_t state_store(struct device *dev, struct device_attribute *attr,
			   const char *buf,size_t count)
{
	char *endp;
	struct output_device *od = to_output_device(dev);
	int request_state = simple_strtoul(buf,&endp,0);
	size_t size = endp - buf;

	if (isspace(*endp))
		size++;
	if (size != count)
		return -EINVAL;

	if (od->props) {
		od->request_state = request_state;
		od->props->set_state(od);
	}
	return count;
}
static DEVICE_ATTR_RW(state);

static void video_output_release(struct device *dev)
{
	struct output_device *od = to_output_device(dev);
	kfree(od);
}

static struct attribute *video_output_attrs[] = {
	&dev_attr_state.attr,
	NULL,
};
ATTRIBUTE_GROUPS(video_output);

static struct class video_output_class = {
	.name = "video_output",
	.dev_release = video_output_release,
	.dev_groups = video_output_groups,
};

struct output_device *video_output_register(const char *name,
	struct device *dev,
	void *devdata,
	struct output_properties *op)
{
	struct output_device *new_dev;
	int ret_code = 0;

	new_dev = kzalloc(sizeof(struct output_device),GFP_KERNEL);
	if (!new_dev) {
		ret_code = -ENOMEM;
		goto error_return;
	}
	new_dev->props = op;
	new_dev->dev.class = &video_output_class;
	new_dev->dev.parent = dev;
	dev_set_name(&new_dev->dev, "%s", name);
	dev_set_drvdata(&new_dev->dev, devdata);
	ret_code = device_register(&new_dev->dev);
	if (ret_code) {
		kfree(new_dev);
		goto error_return;
	}
	return new_dev;

error_return:
	return ERR_PTR(ret_code);
}
EXPORT_SYMBOL(video_output_register);

void video_output_unregister(struct output_device *dev)
{
	if (!dev)
		return;
	device_unregister(&dev->dev);
}
EXPORT_SYMBOL(video_output_unregister);

static void __exit video_output_class_exit(void)
{
	class_unregister(&video_output_class);
}

static int __init video_output_class_init(void)
{
	return class_register(&video_output_class);
}

postcore_initcall(video_output_class_init);
module_exit(video_output_class_exit);