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1 | /* |
2 | * Copyright 2012 Red Hat, Inc <mjg@redhat.com> |
3 | * Copyright 2012 Intel Corporation |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License version 2 as |
7 | * published by the Free Software Foundation. |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/device.h> |
14 | #include <linux/sysfs.h> |
15 | #include <linux/efi-bgrt.h> |
16 | |
17 | static struct kobject *bgrt_kobj; |
18 | |
19 | static ssize_t show_version(struct device *dev, |
20 | struct device_attribute *attr, char *buf) |
21 | { |
22 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version); |
23 | } |
24 | static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); |
25 | |
26 | static ssize_t show_status(struct device *dev, |
27 | struct device_attribute *attr, char *buf) |
28 | { |
29 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status); |
30 | } |
31 | static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); |
32 | |
33 | static ssize_t show_type(struct device *dev, |
34 | struct device_attribute *attr, char *buf) |
35 | { |
36 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type); |
37 | } |
38 | static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); |
39 | |
40 | static ssize_t show_xoffset(struct device *dev, |
41 | struct device_attribute *attr, char *buf) |
42 | { |
43 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x); |
44 | } |
45 | static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL); |
46 | |
47 | static ssize_t show_yoffset(struct device *dev, |
48 | struct device_attribute *attr, char *buf) |
49 | { |
50 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y); |
51 | } |
52 | static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); |
53 | |
54 | static ssize_t show_image(struct file *file, struct kobject *kobj, |
55 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
56 | { |
57 | memcpy(buf, attr->private + off, count); |
58 | return count; |
59 | } |
60 | |
61 | static struct bin_attribute image_attr = { |
62 | .attr = { |
63 | .name = "image", |
64 | .mode = S_IRUGO, |
65 | }, |
66 | .read = show_image, |
67 | }; |
68 | |
69 | static struct attribute *bgrt_attributes[] = { |
70 | &dev_attr_version.attr, |
71 | &dev_attr_status.attr, |
72 | &dev_attr_type.attr, |
73 | &dev_attr_xoffset.attr, |
74 | &dev_attr_yoffset.attr, |
75 | NULL, |
76 | }; |
77 | |
78 | static struct attribute_group bgrt_attribute_group = { |
79 | .attrs = bgrt_attributes, |
80 | }; |
81 | |
82 | static int __init bgrt_init(void) |
83 | { |
84 | int ret; |
85 | |
86 | if (!bgrt_image) |
87 | return -ENODEV; |
88 | |
89 | sysfs_bin_attr_init(&image_attr); |
90 | image_attr.private = bgrt_image; |
91 | image_attr.size = bgrt_image_size; |
92 | |
93 | bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); |
94 | if (!bgrt_kobj) |
95 | return -EINVAL; |
96 | |
97 | ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); |
98 | if (ret) |
99 | goto out_kobject; |
100 | |
101 | ret = sysfs_create_bin_file(bgrt_kobj, &image_attr); |
102 | if (ret) |
103 | goto out_group; |
104 | |
105 | return 0; |
106 | |
107 | out_group: |
108 | sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); |
109 | out_kobject: |
110 | kobject_put(bgrt_kobj); |
111 | return ret; |
112 | } |
113 | |
114 | module_init(bgrt_init); |
115 | |
116 | MODULE_AUTHOR("Matthew Garrett, Josh Triplett <josh@joshtriplett.org>"); |
117 | MODULE_DESCRIPTION("BGRT boot graphic support"); |
118 | MODULE_LICENSE("GPL"); |
119 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9