1/*
2 *  output.c - Display Output Switch driver
3 *
4 *  Copyright (C) 2006 Luming Yu <luming.yu@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 *  This program is free software; you can redistribute it and/or modify
9 *  it under the terms of the GNU General Public License as published by
10 *  the Free Software Foundation; either version 2 of the License, or (at
11 *  your option) any later version.
12 *
13 *  This program is distributed in the hope that it will be useful, but
14 *  WITHOUT ANY WARRANTY; without even the implied warranty of
15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 *  General Public License for more details.
17 *
18 *  You should have received a copy of the GNU General Public License along
19 *  with this program; if not, write to the Free Software Foundation, Inc.,
20 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24#include <linux/module.h>
25#include <linux/video_output.h>
26#include <linux/err.h>
27#include <linux/ctype.h>
28
29
30MODULE_DESCRIPTION("Display Output Switcher Lowlevel Control Abstraction");
31MODULE_LICENSE("GPL");
32MODULE_AUTHOR("Luming Yu <luming.yu@intel.com>");
33
34static ssize_t video_output_show_state(struct class_device *dev,char *buf)
35{
36	ssize_t ret_size = 0;
37	struct output_device *od = to_output_device(dev);
38	if (od->props)
39		ret_size = sprintf(buf,"%.8x\n",od->props->get_status(od));
40	return ret_size;
41}
42
43static ssize_t video_output_store_state(struct class_device *dev,
44	const char *buf,size_t count)
45{
46	char *endp;
47	struct output_device *od = to_output_device(dev);
48	int request_state = simple_strtoul(buf,&endp,0);
49	size_t size = endp - buf;
50
51	if (*endp && isspace(*endp))
52		size++;
53	if (size != count)
54		return -EINVAL;
55
56	if (od->props) {
57		od->request_state = request_state;
58		od->props->set_state(od);
59	}
60	return count;
61}
62
63static void video_output_class_release(struct class_device *dev)
64{
65	struct output_device *od = to_output_device(dev);
66	kfree(od);
67}
68
69static struct class_device_attribute video_output_attributes[] = {
70	__ATTR(state, 0644, video_output_show_state, video_output_store_state),
71	__ATTR_NULL,
72};
73
74static struct class video_output_class = {
75	.name = "video_output",
76	.release = video_output_class_release,
77	.class_dev_attrs = video_output_attributes,
78};
79
80struct output_device *video_output_register(const char *name,
81	struct device *dev,
82	void *devdata,
83	struct output_properties *op)
84{
85	struct output_device *new_dev;
86	int ret_code = 0;
87
88	new_dev = kzalloc(sizeof(struct output_device),GFP_KERNEL);
89	if (!new_dev) {
90		ret_code = -ENOMEM;
91		goto error_return;
92	}
93	new_dev->props = op;
94	new_dev->class_dev.class = &video_output_class;
95	new_dev->class_dev.dev = dev;
96	strlcpy(new_dev->class_dev.class_id,name,KOBJ_NAME_LEN);
97	class_set_devdata(&new_dev->class_dev,devdata);
98	ret_code = class_device_register(&new_dev->class_dev);
99	if (ret_code) {
100		kfree(new_dev);
101		goto error_return;
102	}
103	return new_dev;
104
105error_return:
106	return ERR_PTR(ret_code);
107}
108EXPORT_SYMBOL(video_output_register);
109
110void video_output_unregister(struct output_device *dev)
111{
112	if (!dev)
113		return;
114	class_device_unregister(&dev->class_dev);
115}
116EXPORT_SYMBOL(video_output_unregister);
117
118static void __exit video_output_class_exit(void)
119{
120	class_unregister(&video_output_class);
121}
122
123static int __init video_output_class_init(void)
124{
125	return class_register(&video_output_class);
126}
127
128postcore_initcall(video_output_class_init);
129module_exit(video_output_class_exit);
130