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1/*
2 * BGRT boot graphic support
3 * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
4 * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
5 * Copyright 2012 Intel Corporation
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>
13#include <linux/init.h>
14#include <linux/device.h>
15#include <linux/sysfs.h>
16#include <linux/efi-bgrt.h>
17
18static struct kobject *bgrt_kobj;
19
20static 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}
25static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
26
27static 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}
32static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
33
34static 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}
39static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
40
41static 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}
46static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
47
48static 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}
53static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
54
55static ssize_t image_read(struct file *file, struct kobject *kobj,
56 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
57{
58 memcpy(buf, attr->private + off, count);
59 return count;
60}
61
62static BIN_ATTR_RO(image, 0); /* size gets filled in later */
63
64static 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
73static struct bin_attribute *bgrt_bin_attributes[] = {
74 &bin_attr_image,
75 NULL,
76};
77
78static struct attribute_group bgrt_attribute_group = {
79 .attrs = bgrt_attributes,
80 .bin_attrs = bgrt_bin_attributes,
81};
82
83static int __init bgrt_init(void)
84{
85 int ret;
86
87 if (!bgrt_image)
88 return -ENODEV;
89
90 bin_attr_image.private = bgrt_image;
91 bin_attr_image.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 return 0;
102
103out_kobject:
104 kobject_put(bgrt_kobj);
105 return ret;
106}
107device_initcall(bgrt_init);
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 ssize_t image_read(struct file *file, struct kobject *kobj,
33 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
34{
35 memcpy(buf, attr->private + off, count);
36 return count;
37}
38
39static BIN_ATTR_RO(image, 0); /* size gets filled in later */
40
41static struct attribute *bgrt_attributes[] = {
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,
47 NULL,
48};
49
50static struct bin_attribute *bgrt_bin_attributes[] = {
51 &bin_attr_image,
52 NULL,
53};
54
55static const struct attribute_group bgrt_attribute_group = {
56 .attrs = bgrt_attributes,
57 .bin_attrs = bgrt_bin_attributes,
58};
59
60int __init acpi_parse_bgrt(struct acpi_table_header *table)
61{
62 efi_bgrt_init(table);
63 return 0;
64}
65
66static int __init bgrt_init(void)
67{
68 int ret;
69
70 if (!bgrt_tab.image_address)
71 return -ENODEV;
72
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
80 bin_attr_image.private = bgrt_image;
81 bin_attr_image.size = bgrt_image_size;
82
83 bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
84 if (!bgrt_kobj) {
85 ret = -EINVAL;
86 goto out_memmap;
87 }
88
89 ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
90 if (ret)
91 goto out_kobject;
92
93 return 0;
94
95out_kobject:
96 kobject_put(bgrt_kobj);
97out_memmap:
98 memunmap(bgrt_image);
99 return ret;
100}
101device_initcall(bgrt_init);