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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * BGRT boot graphic support
4 * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
5 * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
6 * Copyright 2012 Intel Corporation
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/device.h>
12#include <linux/sysfs.h>
13#include <linux/efi-bgrt.h>
14
15static void *bgrt_image;
16static struct kobject *bgrt_kobj;
17
18#define BGRT_SHOW(_name, _member) \
19 static ssize_t _name##_show(struct kobject *kobj, \
20 struct kobj_attribute *attr, char *buf) \
21 { \
22 return sysfs_emit(buf, "%d\n", bgrt_tab._member); \
23 } \
24 static struct kobj_attribute bgrt_attr_##_name = __ATTR_RO(_name)
25
26BGRT_SHOW(version, version);
27BGRT_SHOW(status, status);
28BGRT_SHOW(type, image_type);
29BGRT_SHOW(xoffset, image_offset_x);
30BGRT_SHOW(yoffset, image_offset_y);
31
32static BIN_ATTR_SIMPLE_RO(image);
33
34static struct attribute *bgrt_attributes[] = {
35 &bgrt_attr_version.attr,
36 &bgrt_attr_status.attr,
37 &bgrt_attr_type.attr,
38 &bgrt_attr_xoffset.attr,
39 &bgrt_attr_yoffset.attr,
40 NULL,
41};
42
43static struct bin_attribute *bgrt_bin_attributes[] = {
44 &bin_attr_image,
45 NULL,
46};
47
48static const struct attribute_group bgrt_attribute_group = {
49 .attrs = bgrt_attributes,
50 .bin_attrs = bgrt_bin_attributes,
51};
52
53int __init acpi_parse_bgrt(struct acpi_table_header *table)
54{
55 efi_bgrt_init(table);
56 return 0;
57}
58
59static int __init bgrt_init(void)
60{
61 int ret;
62
63 if (!bgrt_tab.image_address)
64 return -ENODEV;
65
66 bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
67 MEMREMAP_WB);
68 if (!bgrt_image) {
69 pr_notice("Ignoring BGRT: failed to map image memory\n");
70 return -ENOMEM;
71 }
72
73 bin_attr_image.private = bgrt_image;
74 bin_attr_image.size = bgrt_image_size;
75
76 bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
77 if (!bgrt_kobj) {
78 ret = -EINVAL;
79 goto out_memmap;
80 }
81
82 ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
83 if (ret)
84 goto out_kobject;
85
86 return 0;
87
88out_kobject:
89 kobject_put(bgrt_kobj);
90out_memmap:
91 memunmap(bgrt_image);
92 return ret;
93}
94device_initcall(bgrt_init);
1/*
2 * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/device.h>
13#include <linux/sysfs.h>
14#include <linux/io.h>
15#include <acpi/acpi.h>
16#include <acpi/acpi_bus.h>
17
18static struct acpi_table_bgrt *bgrt_tab;
19static struct kobject *bgrt_kobj;
20
21struct bmp_header {
22 u16 id;
23 u32 size;
24} __attribute ((packed));
25
26static struct bmp_header bmp_header;
27
28static ssize_t show_version(struct device *dev,
29 struct device_attribute *attr, char *buf)
30{
31 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version);
32}
33static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
34
35static ssize_t show_status(struct device *dev,
36 struct device_attribute *attr, char *buf)
37{
38 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status);
39}
40static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
41
42static ssize_t show_type(struct device *dev,
43 struct device_attribute *attr, char *buf)
44{
45 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type);
46}
47static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
48
49static ssize_t show_xoffset(struct device *dev,
50 struct device_attribute *attr, char *buf)
51{
52 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x);
53}
54static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
55
56static ssize_t show_yoffset(struct device *dev,
57 struct device_attribute *attr, char *buf)
58{
59 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y);
60}
61static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
62
63static ssize_t show_image(struct file *file, struct kobject *kobj,
64 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
65{
66 int size = attr->size;
67 void __iomem *image = attr->private;
68
69 if (off >= size) {
70 count = 0;
71 } else {
72 if (off + count > size)
73 count = size - off;
74
75 memcpy_fromio(buf, image+off, count);
76 }
77
78 return count;
79}
80
81static struct bin_attribute image_attr = {
82 .attr = {
83 .name = "image",
84 .mode = S_IRUGO,
85 },
86 .read = show_image,
87};
88
89static struct attribute *bgrt_attributes[] = {
90 &dev_attr_version.attr,
91 &dev_attr_status.attr,
92 &dev_attr_type.attr,
93 &dev_attr_xoffset.attr,
94 &dev_attr_yoffset.attr,
95 NULL,
96};
97
98static struct attribute_group bgrt_attribute_group = {
99 .attrs = bgrt_attributes,
100};
101
102static int __init bgrt_init(void)
103{
104 acpi_status status;
105 int ret;
106 void __iomem *bgrt;
107
108 if (acpi_disabled)
109 return -ENODEV;
110
111 status = acpi_get_table("BGRT", 0,
112 (struct acpi_table_header **)&bgrt_tab);
113
114 if (ACPI_FAILURE(status))
115 return -ENODEV;
116
117 sysfs_bin_attr_init(&image_attr);
118
119 bgrt = ioremap(bgrt_tab->image_address, sizeof(struct bmp_header));
120
121 if (!bgrt) {
122 ret = -EINVAL;
123 goto out_err;
124 }
125
126 memcpy_fromio(&bmp_header, bgrt, sizeof(bmp_header));
127 image_attr.size = bmp_header.size;
128 iounmap(bgrt);
129
130 image_attr.private = ioremap(bgrt_tab->image_address, image_attr.size);
131
132 if (!image_attr.private) {
133 ret = -EINVAL;
134 goto out_err;
135 }
136
137
138 bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
139 if (!bgrt_kobj) {
140 ret = -EINVAL;
141 goto out_iounmap;
142 }
143
144 ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
145 if (ret)
146 goto out_kobject;
147
148 ret = sysfs_create_bin_file(bgrt_kobj, &image_attr);
149 if (ret)
150 goto out_group;
151
152 return 0;
153
154out_group:
155 sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
156out_kobject:
157 kobject_put(bgrt_kobj);
158out_iounmap:
159 iounmap(image_attr.private);
160out_err:
161 return ret;
162}
163
164static void __exit bgrt_exit(void)
165{
166 iounmap(image_attr.private);
167 sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
168 sysfs_remove_bin_file(bgrt_kobj, &image_attr);
169}
170
171module_init(bgrt_init);
172module_exit(bgrt_exit);
173
174MODULE_AUTHOR("Matthew Garrett");
175MODULE_DESCRIPTION("BGRT boot graphic support");
176MODULE_LICENSE("GPL");