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authorYu Luming <luming.yu@gmail.com>2006-12-19 15:56:17 -0500
committerLen Brown <len.brown@intel.com>2006-12-20 01:46:41 -0500
commit2dec3ba8d872aa3ffbcdb8f6f8a2c0bcd44e9910 (patch)
tree6b732a1badfed8d1a9cf724ffca14d1c36ff678a /drivers/video
parentf238085415c56618e042252894f2fcc971add645 (diff)
output: Add display output class support
Add generic abstract layer for display output switch control. The output sysfs class driver provides an abstract video output layer that can be used to hook platform specific methods to enable/disable video output device through common sysfs interface. Signed-off-by: Luming Yu <Luming.yu@intel.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/output.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/video/output.c b/drivers/video/output.c
new file mode 100644
index 000000000000..1473f2c892d2
--- /dev/null
+++ b/drivers/video/output.c
@@ -0,0 +1,129 @@
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);