Commit | Line | Data |
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d1ff4b1c MG |
1 | /* |
2 | * Copyright 2012 Red Hat, Inc <mjg@redhat.com> | |
2223af38 | 3 | * Copyright 2012 Intel Corporation |
d1ff4b1c MG |
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> | |
2223af38 | 15 | #include <linux/efi-bgrt.h> |
d1ff4b1c | 16 | |
d1ff4b1c MG |
17 | static struct kobject *bgrt_kobj; |
18 | ||
d1ff4b1c MG |
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 | ||
65f44679 | 54 | static ssize_t image_read(struct file *file, struct kobject *kobj, |
d1ff4b1c MG |
55 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
56 | { | |
2223af38 | 57 | memcpy(buf, attr->private + off, count); |
d1ff4b1c MG |
58 | return count; |
59 | } | |
60 | ||
65f44679 | 61 | static BIN_ATTR_RO(image, 0); /* size gets filled in later */ |
d1ff4b1c MG |
62 | |
63 | static struct attribute *bgrt_attributes[] = { | |
64 | &dev_attr_version.attr, | |
65 | &dev_attr_status.attr, | |
66 | &dev_attr_type.attr, | |
67 | &dev_attr_xoffset.attr, | |
68 | &dev_attr_yoffset.attr, | |
69 | NULL, | |
70 | }; | |
71 | ||
65f44679 GK |
72 | static struct bin_attribute *bgrt_bin_attributes[] = { |
73 | &bin_attr_image, | |
74 | NULL, | |
75 | }; | |
76 | ||
d1ff4b1c MG |
77 | static struct attribute_group bgrt_attribute_group = { |
78 | .attrs = bgrt_attributes, | |
65f44679 | 79 | .bin_attrs = bgrt_bin_attributes, |
d1ff4b1c MG |
80 | }; |
81 | ||
82 | static int __init bgrt_init(void) | |
83 | { | |
d1ff4b1c | 84 | int ret; |
d1ff4b1c | 85 | |
2223af38 | 86 | if (!bgrt_image) |
d1ff4b1c MG |
87 | return -ENODEV; |
88 | ||
65f44679 GK |
89 | bin_attr_image.private = bgrt_image; |
90 | bin_attr_image.size = bgrt_image_size; | |
d1ff4b1c MG |
91 | |
92 | bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); | |
2223af38 JT |
93 | if (!bgrt_kobj) |
94 | return -EINVAL; | |
d1ff4b1c MG |
95 | |
96 | ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); | |
97 | if (ret) | |
98 | goto out_kobject; | |
99 | ||
d1ff4b1c MG |
100 | return 0; |
101 | ||
d1ff4b1c MG |
102 | out_kobject: |
103 | kobject_put(bgrt_kobj); | |
d1ff4b1c MG |
104 | return ret; |
105 | } | |
106 | ||
d1ff4b1c | 107 | module_init(bgrt_init); |
d1ff4b1c | 108 | |
2223af38 | 109 | MODULE_AUTHOR("Matthew Garrett, Josh Triplett <josh@joshtriplett.org>"); |
d1ff4b1c MG |
110 | MODULE_DESCRIPTION("BGRT boot graphic support"); |
111 | MODULE_LICENSE("GPL"); |