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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/slab.h> |
27 | #include <linux/err.h> |
28 | #include <linux/ctype.h> |
29 | |
30 | |
31 | MODULE_DESCRIPTION("Display Output Switcher Lowlevel Control Abstraction"); |
32 | MODULE_LICENSE("GPL"); |
33 | MODULE_AUTHOR("Luming Yu <luming.yu@intel.com>"); |
34 | |
35 | static ssize_t video_output_show_state(struct device *dev, |
36 | struct device_attribute *attr, char *buf) |
37 | { |
38 | ssize_t ret_size = 0; |
39 | struct output_device *od = to_output_device(dev); |
40 | if (od->props) |
41 | ret_size = sprintf(buf,"%.8x\n",od->props->get_status(od)); |
42 | return ret_size; |
43 | } |
44 | |
45 | static ssize_t video_output_store_state(struct device *dev, |
46 | struct device_attribute *attr, |
47 | const char *buf,size_t count) |
48 | { |
49 | char *endp; |
50 | struct output_device *od = to_output_device(dev); |
51 | int request_state = simple_strtoul(buf,&endp,0); |
52 | size_t size = endp - buf; |
53 | |
54 | if (isspace(*endp)) |
55 | size++; |
56 | if (size != count) |
57 | return -EINVAL; |
58 | |
59 | if (od->props) { |
60 | od->request_state = request_state; |
61 | od->props->set_state(od); |
62 | } |
63 | return count; |
64 | } |
65 | |
66 | static void video_output_release(struct device *dev) |
67 | { |
68 | struct output_device *od = to_output_device(dev); |
69 | kfree(od); |
70 | } |
71 | |
72 | static struct device_attribute video_output_attributes[] = { |
73 | __ATTR(state, 0644, video_output_show_state, video_output_store_state), |
74 | __ATTR_NULL, |
75 | }; |
76 | |
77 | |
78 | static struct class video_output_class = { |
79 | .name = "video_output", |
80 | .dev_release = video_output_release, |
81 | .dev_attrs = video_output_attributes, |
82 | }; |
83 | |
84 | struct output_device *video_output_register(const char *name, |
85 | struct device *dev, |
86 | void *devdata, |
87 | struct output_properties *op) |
88 | { |
89 | struct output_device *new_dev; |
90 | int ret_code = 0; |
91 | |
92 | new_dev = kzalloc(sizeof(struct output_device),GFP_KERNEL); |
93 | if (!new_dev) { |
94 | ret_code = -ENOMEM; |
95 | goto error_return; |
96 | } |
97 | new_dev->props = op; |
98 | new_dev->dev.class = &video_output_class; |
99 | new_dev->dev.parent = dev; |
100 | dev_set_name(&new_dev->dev, name); |
101 | dev_set_drvdata(&new_dev->dev, devdata); |
102 | ret_code = device_register(&new_dev->dev); |
103 | if (ret_code) { |
104 | kfree(new_dev); |
105 | goto error_return; |
106 | } |
107 | return new_dev; |
108 | |
109 | error_return: |
110 | return ERR_PTR(ret_code); |
111 | } |
112 | EXPORT_SYMBOL(video_output_register); |
113 | |
114 | void video_output_unregister(struct output_device *dev) |
115 | { |
116 | if (!dev) |
117 | return; |
118 | device_unregister(&dev->dev); |
119 | } |
120 | EXPORT_SYMBOL(video_output_unregister); |
121 | |
122 | static void __exit video_output_class_exit(void) |
123 | { |
124 | class_unregister(&video_output_class); |
125 | } |
126 | |
127 | static int __init video_output_class_init(void) |
128 | { |
129 | return class_register(&video_output_class); |
130 | } |
131 | |
132 | postcore_initcall(video_output_class_init); |
133 | module_exit(video_output_class_exit); |
134 |
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