Commit | Line | Data |
---|---|---|
d1ff4b1c | 1 | /* |
cc079f8c PG |
2 | * BGRT boot graphic support |
3 | * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org> | |
d1ff4b1c | 4 | * Copyright 2012 Red Hat, Inc <mjg@redhat.com> |
2223af38 | 5 | * Copyright 2012 Intel Corporation |
d1ff4b1c MG |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
d1ff4b1c MG |
13 | #include <linux/init.h> |
14 | #include <linux/device.h> | |
15 | #include <linux/sysfs.h> | |
2223af38 | 16 | #include <linux/efi-bgrt.h> |
d1ff4b1c | 17 | |
d1ff4b1c MG |
18 | static struct kobject *bgrt_kobj; |
19 | ||
d1ff4b1c MG |
20 | static ssize_t show_version(struct device *dev, |
21 | struct device_attribute *attr, char *buf) | |
22 | { | |
23 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version); | |
24 | } | |
25 | static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); | |
26 | ||
27 | static ssize_t show_status(struct device *dev, | |
28 | struct device_attribute *attr, char *buf) | |
29 | { | |
30 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status); | |
31 | } | |
32 | static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); | |
33 | ||
34 | static ssize_t show_type(struct device *dev, | |
35 | struct device_attribute *attr, char *buf) | |
36 | { | |
37 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type); | |
38 | } | |
39 | static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); | |
40 | ||
41 | static ssize_t show_xoffset(struct device *dev, | |
42 | struct device_attribute *attr, char *buf) | |
43 | { | |
44 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x); | |
45 | } | |
46 | static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL); | |
47 | ||
48 | static ssize_t show_yoffset(struct device *dev, | |
49 | struct device_attribute *attr, char *buf) | |
50 | { | |
51 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y); | |
52 | } | |
53 | static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); | |
54 | ||
65f44679 | 55 | static ssize_t image_read(struct file *file, struct kobject *kobj, |
d1ff4b1c MG |
56 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
57 | { | |
2223af38 | 58 | memcpy(buf, attr->private + off, count); |
d1ff4b1c MG |
59 | return count; |
60 | } | |
61 | ||
65f44679 | 62 | static BIN_ATTR_RO(image, 0); /* size gets filled in later */ |
d1ff4b1c MG |
63 | |
64 | static struct attribute *bgrt_attributes[] = { | |
65 | &dev_attr_version.attr, | |
66 | &dev_attr_status.attr, | |
67 | &dev_attr_type.attr, | |
68 | &dev_attr_xoffset.attr, | |
69 | &dev_attr_yoffset.attr, | |
70 | NULL, | |
71 | }; | |
72 | ||
65f44679 GK |
73 | static struct bin_attribute *bgrt_bin_attributes[] = { |
74 | &bin_attr_image, | |
75 | NULL, | |
76 | }; | |
77 | ||
d1ff4b1c MG |
78 | static struct attribute_group bgrt_attribute_group = { |
79 | .attrs = bgrt_attributes, | |
65f44679 | 80 | .bin_attrs = bgrt_bin_attributes, |
d1ff4b1c MG |
81 | }; |
82 | ||
83 | static int __init bgrt_init(void) | |
84 | { | |
d1ff4b1c | 85 | int ret; |
d1ff4b1c | 86 | |
2223af38 | 87 | if (!bgrt_image) |
d1ff4b1c MG |
88 | return -ENODEV; |
89 | ||
65f44679 GK |
90 | bin_attr_image.private = bgrt_image; |
91 | bin_attr_image.size = bgrt_image_size; | |
d1ff4b1c MG |
92 | |
93 | bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); | |
2223af38 JT |
94 | if (!bgrt_kobj) |
95 | return -EINVAL; | |
d1ff4b1c MG |
96 | |
97 | ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); | |
98 | if (ret) | |
99 | goto out_kobject; | |
100 | ||
d1ff4b1c MG |
101 | return 0; |
102 | ||
d1ff4b1c MG |
103 | out_kobject: |
104 | kobject_put(bgrt_kobj); | |
d1ff4b1c MG |
105 | return ret; |
106 | } | |
cc079f8c | 107 | device_initcall(bgrt_init); |