1/*
2 * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
3 * Copyright 2012 Intel Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/device.h>
14#include <linux/sysfs.h>
15#include <linux/efi-bgrt.h>
16
17static struct kobject *bgrt_kobj;
18
19static ssize_t show_version(struct device *dev,
20			    struct device_attribute *attr, char *buf)
21{
22	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version);
23}
24static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
25
26static ssize_t show_status(struct device *dev,
27			   struct device_attribute *attr, char *buf)
28{
29	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status);
30}
31static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
32
33static ssize_t show_type(struct device *dev,
34			 struct device_attribute *attr, char *buf)
35{
36	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type);
37}
38static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
39
40static ssize_t show_xoffset(struct device *dev,
41			    struct device_attribute *attr, char *buf)
42{
43	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x);
44}
45static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
46
47static ssize_t show_yoffset(struct device *dev,
48			    struct device_attribute *attr, char *buf)
49{
50	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y);
51}
52static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
53
54static ssize_t image_read(struct file *file, struct kobject *kobj,
55	       struct bin_attribute *attr, char *buf, loff_t off, size_t count)
56{
57	memcpy(buf, attr->private + off, count);
58	return count;
59}
60
61static BIN_ATTR_RO(image, 0);	/* size gets filled in later */
62
63static struct attribute *bgrt_attributes[] = {
64	&dev_attr_version.attr,
65	&dev_attr_status.attr,
66	&dev_attr_type.attr,
67	&dev_attr_xoffset.attr,
68	&dev_attr_yoffset.attr,
69	NULL,
70};
71
72static struct bin_attribute *bgrt_bin_attributes[] = {
73	&bin_attr_image,
74	NULL,
75};
76
77static struct attribute_group bgrt_attribute_group = {
78	.attrs = bgrt_attributes,
79	.bin_attrs = bgrt_bin_attributes,
80};
81
82static int __init bgrt_init(void)
83{
84	int ret;
85
86	if (!bgrt_image)
87		return -ENODEV;
88
89	bin_attr_image.private = bgrt_image;
90	bin_attr_image.size = bgrt_image_size;
91
92	bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
93	if (!bgrt_kobj)
94		return -EINVAL;
95
96	ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
97	if (ret)
98		goto out_kobject;
99
100	return 0;
101
102out_kobject:
103	kobject_put(bgrt_kobj);
104	return ret;
105}
106
107module_init(bgrt_init);
108
109MODULE_AUTHOR("Matthew Garrett, Josh Triplett <josh@joshtriplett.org>");
110MODULE_DESCRIPTION("BGRT boot graphic support");
111MODULE_LICENSE("GPL");
112