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 void *bgrt_image;
19static struct kobject *bgrt_kobj;
20
21static ssize_t show_version(struct device *dev,
22 struct device_attribute *attr, char *buf)
23{
24 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
25}
26static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
27
28static ssize_t show_status(struct device *dev,
29 struct device_attribute *attr, char *buf)
30{
31 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
32}
33static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
34
35static ssize_t show_type(struct device *dev,
36 struct device_attribute *attr, char *buf)
37{
38 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
39}
40static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
41
42static ssize_t show_xoffset(struct device *dev,
43 struct device_attribute *attr, char *buf)
44{
45 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
46}
47static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
48
49static ssize_t show_yoffset(struct device *dev,
50 struct device_attribute *attr, char *buf)
51{
52 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
53}
54static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
55
56static ssize_t image_read(struct file *file, struct kobject *kobj,
57 struct bin_attribute *attr, char *buf, loff_t off, size_t count)
58{
59 memcpy(buf, attr->private + off, count);
60 return count;
61}
62
63static BIN_ATTR_RO(image, 0); /* size gets filled in later */
64
65static struct attribute *bgrt_attributes[] = {
66 &dev_attr_version.attr,
67 &dev_attr_status.attr,
68 &dev_attr_type.attr,
69 &dev_attr_xoffset.attr,
70 &dev_attr_yoffset.attr,
71 NULL,
72};
73
74static struct bin_attribute *bgrt_bin_attributes[] = {
75 &bin_attr_image,
76 NULL,
77};
78
79static const struct attribute_group bgrt_attribute_group = {
80 .attrs = bgrt_attributes,
81 .bin_attrs = bgrt_bin_attributes,
82};
83
84int __init acpi_parse_bgrt(struct acpi_table_header *table)
85{
86 efi_bgrt_init(table);
87 return 0;
88}
89
90static int __init bgrt_init(void)
91{
92 int ret;
93
94 if (!bgrt_tab.image_address)
95 return -ENODEV;
96
97 bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
98 MEMREMAP_WB);
99 if (!bgrt_image) {
100 pr_notice("Ignoring BGRT: failed to map image memory\n");
101 return -ENOMEM;
102 }
103
104 bin_attr_image.private = bgrt_image;
105 bin_attr_image.size = bgrt_image_size;
106
107 bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
108 if (!bgrt_kobj) {
109 ret = -EINVAL;
110 goto out_memmap;
111 }
112
113 ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
114 if (ret)
115 goto out_kobject;
116
117 return 0;
118
119out_kobject:
120 kobject_put(bgrt_kobj);
121out_memmap:
122 memunmap(bgrt_image);
123 return ret;
124}
125device_initcall(bgrt_init);
126