Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d1ff4b1c | 2 | /* |
cc079f8c PG |
3 | * BGRT boot graphic support |
4 | * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org> | |
d1ff4b1c | 5 | * Copyright 2012 Red Hat, Inc <mjg@redhat.com> |
2223af38 | 6 | * Copyright 2012 Intel Corporation |
d1ff4b1c MG |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
d1ff4b1c MG |
10 | #include <linux/init.h> |
11 | #include <linux/device.h> | |
12 | #include <linux/sysfs.h> | |
2223af38 | 13 | #include <linux/efi-bgrt.h> |
d1ff4b1c | 14 | |
7b0a9114 | 15 | static void *bgrt_image; |
d1ff4b1c MG |
16 | static struct kobject *bgrt_kobj; |
17 | ||
f37ccf8f NC |
18 | #define BGRT_SHOW(_name, _member) \ |
19 | static ssize_t _name##_show(struct kobject *kobj, \ | |
20 | struct kobj_attribute *attr, char *buf) \ | |
21 | { \ | |
6554ca9c | 22 | return sysfs_emit(buf, "%d\n", bgrt_tab._member); \ |
f37ccf8f | 23 | } \ |
db2d1693 | 24 | static struct kobj_attribute bgrt_attr_##_name = __ATTR_RO(_name) |
f37ccf8f NC |
25 | |
26 | BGRT_SHOW(version, version); | |
27 | BGRT_SHOW(status, status); | |
28 | BGRT_SHOW(type, image_type); | |
29 | BGRT_SHOW(xoffset, image_offset_x); | |
30 | BGRT_SHOW(yoffset, image_offset_y); | |
d1ff4b1c | 31 | |
65f44679 | 32 | static ssize_t image_read(struct file *file, struct kobject *kobj, |
d1ff4b1c MG |
33 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
34 | { | |
2223af38 | 35 | memcpy(buf, attr->private + off, count); |
d1ff4b1c MG |
36 | return count; |
37 | } | |
38 | ||
65f44679 | 39 | static BIN_ATTR_RO(image, 0); /* size gets filled in later */ |
d1ff4b1c MG |
40 | |
41 | static struct attribute *bgrt_attributes[] = { | |
f37ccf8f NC |
42 | &bgrt_attr_version.attr, |
43 | &bgrt_attr_status.attr, | |
44 | &bgrt_attr_type.attr, | |
45 | &bgrt_attr_xoffset.attr, | |
46 | &bgrt_attr_yoffset.attr, | |
d1ff4b1c MG |
47 | NULL, |
48 | }; | |
49 | ||
65f44679 GK |
50 | static struct bin_attribute *bgrt_bin_attributes[] = { |
51 | &bin_attr_image, | |
52 | NULL, | |
53 | }; | |
54 | ||
7e536269 | 55 | static const struct attribute_group bgrt_attribute_group = { |
d1ff4b1c | 56 | .attrs = bgrt_attributes, |
65f44679 | 57 | .bin_attrs = bgrt_bin_attributes, |
d1ff4b1c MG |
58 | }; |
59 | ||
6e7300cf BS |
60 | int __init acpi_parse_bgrt(struct acpi_table_header *table) |
61 | { | |
62 | efi_bgrt_init(table); | |
63 | return 0; | |
64 | } | |
65 | ||
d1ff4b1c MG |
66 | static int __init bgrt_init(void) |
67 | { | |
d1ff4b1c | 68 | int ret; |
d1ff4b1c | 69 | |
7b0a9114 | 70 | if (!bgrt_tab.image_address) |
d1ff4b1c MG |
71 | return -ENODEV; |
72 | ||
7b0a9114 DY |
73 | bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size, |
74 | MEMREMAP_WB); | |
75 | if (!bgrt_image) { | |
76 | pr_notice("Ignoring BGRT: failed to map image memory\n"); | |
77 | return -ENOMEM; | |
78 | } | |
79 | ||
65f44679 GK |
80 | bin_attr_image.private = bgrt_image; |
81 | bin_attr_image.size = bgrt_image_size; | |
d1ff4b1c MG |
82 | |
83 | bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); | |
7b0a9114 DY |
84 | if (!bgrt_kobj) { |
85 | ret = -EINVAL; | |
86 | goto out_memmap; | |
87 | } | |
d1ff4b1c MG |
88 | |
89 | ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); | |
90 | if (ret) | |
91 | goto out_kobject; | |
92 | ||
d1ff4b1c MG |
93 | return 0; |
94 | ||
d1ff4b1c MG |
95 | out_kobject: |
96 | kobject_put(bgrt_kobj); | |
7b0a9114 DY |
97 | out_memmap: |
98 | memunmap(bgrt_image); | |
d1ff4b1c MG |
99 | return ret; |
100 | } | |
cc079f8c | 101 | device_initcall(bgrt_init); |