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
 
 
 
 
 
 
 
 18static ssize_t show_version(struct device *dev,
 19			    struct device_attribute *attr, char *buf)
 20{
 21	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
 22}
 23static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 24
 25static ssize_t show_status(struct device *dev,
 26			   struct device_attribute *attr, char *buf)
 27{
 28	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
 29}
 30static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
 31
 32static ssize_t show_type(struct device *dev,
 33			 struct device_attribute *attr, char *buf)
 34{
 35	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
 36}
 37static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 38
 39static ssize_t show_xoffset(struct device *dev,
 40			    struct device_attribute *attr, char *buf)
 41{
 42	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
 43}
 44static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
 45
 46static ssize_t show_yoffset(struct device *dev,
 47			    struct device_attribute *attr, char *buf)
 48{
 49	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
 50}
 51static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
 52
 53static ssize_t image_read(struct file *file, struct kobject *kobj,
 54	       struct bin_attribute *attr, char *buf, loff_t off, size_t count)
 55{
 56	memcpy(buf, attr->private + off, count);
 
 
 
 
 
 
 
 
 
 
 
 57	return count;
 58}
 59
 60static BIN_ATTR_RO(image, 0);	/* size gets filled in later */
 
 
 
 
 
 
 61
 62static struct attribute *bgrt_attributes[] = {
 63	&dev_attr_version.attr,
 64	&dev_attr_status.attr,
 65	&dev_attr_type.attr,
 66	&dev_attr_xoffset.attr,
 67	&dev_attr_yoffset.attr,
 68	NULL,
 69};
 70
 71static struct bin_attribute *bgrt_bin_attributes[] = {
 72	&bin_attr_image,
 73	NULL,
 74};
 75
 76static const struct attribute_group bgrt_attribute_group = {
 77	.attrs = bgrt_attributes,
 78	.bin_attrs = bgrt_bin_attributes,
 79};
 80
 81int __init acpi_parse_bgrt(struct acpi_table_header *table)
 82{
 83	efi_bgrt_init(table);
 84	return 0;
 85}
 86
 87static int __init bgrt_init(void)
 88{
 
 89	int ret;
 
 
 
 
 90
 91	if (!bgrt_tab.image_address)
 
 
 
 92		return -ENODEV;
 93
 94	bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
 95			      MEMREMAP_WB);
 96	if (!bgrt_image) {
 97		pr_notice("Ignoring BGRT: failed to map image memory\n");
 98		return -ENOMEM;
 
 
 
 
 
 
 
 
 
 
 
 
 
 99	}
100
101	bin_attr_image.private = bgrt_image;
102	bin_attr_image.size = bgrt_image_size;
103
104	bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
105	if (!bgrt_kobj) {
106		ret = -EINVAL;
107		goto out_memmap;
108	}
109
110	ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
111	if (ret)
112		goto out_kobject;
113
 
 
 
 
114	return 0;
115
 
 
116out_kobject:
117	kobject_put(bgrt_kobj);
118out_memmap:
119	memunmap(bgrt_image);
 
120	return ret;
121}
122device_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");