[linux-block.git] / drivers / acpi / bgrt.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * BGRT boot graphic support
 * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
 * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
 * Copyright 2012 Intel Corporation
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/efi-bgrt.h>

static void *bgrt_image;
static struct kobject *bgrt_kobj;

#define BGRT_SHOW(_name, _member) \
	static ssize_t _name##_show(struct kobject *kobj,			\
				    struct kobj_attribute *attr, char *buf)	\
	{									\
		return sysfs_emit(buf, "%d\n", bgrt_tab._member);		\
	}									\
	static struct kobj_attribute bgrt_attr_##_name = __ATTR_RO(_name)

BGRT_SHOW(version, version);
BGRT_SHOW(status, status);
BGRT_SHOW(type, image_type);
BGRT_SHOW(xoffset, image_offset_x);
BGRT_SHOW(yoffset, image_offset_y);

static ssize_t image_read(struct file *file, struct kobject *kobj,
	       struct bin_attribute *attr, char *buf, loff_t off, size_t count)
{
	memcpy(buf, attr->private + off, count);
	return count;
}

static BIN_ATTR_RO(image, 0);	/* size gets filled in later */

static struct attribute *bgrt_attributes[] = {
	&bgrt_attr_version.attr,
	&bgrt_attr_status.attr,
	&bgrt_attr_type.attr,
	&bgrt_attr_xoffset.attr,
	&bgrt_attr_yoffset.attr,
	NULL,
};

static struct bin_attribute *bgrt_bin_attributes[] = {
	&bin_attr_image,
	NULL,
};

static const struct attribute_group bgrt_attribute_group = {
	.attrs = bgrt_attributes,
	.bin_attrs = bgrt_bin_attributes,
};

int __init acpi_parse_bgrt(struct acpi_table_header *table)
{
	efi_bgrt_init(table);
	return 0;
}

static int __init bgrt_init(void)
{
	int ret;

	if (!bgrt_tab.image_address)
		return -ENODEV;

	bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
			      MEMREMAP_WB);
	if (!bgrt_image) {
		pr_notice("Ignoring BGRT: failed to map image memory\n");
		return -ENOMEM;
	}

	bin_attr_image.private = bgrt_image;
	bin_attr_image.size = bgrt_image_size;

	bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
	if (!bgrt_kobj) {
		ret = -EINVAL;
		goto out_memmap;
	}

	ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
	if (ret)
		goto out_kobject;

	return 0;

out_kobject:
	kobject_put(bgrt_kobj);
out_memmap:
	memunmap(bgrt_image);
	return ret;
}
device_initcall(bgrt_init);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
d1ff4b1c	2	/*
cc079f8c PG	3	* BGRT boot graphic support
cc079f8c PG	4	* Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
d1ff4b1c	5	* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
2223af38	6	* Copyright 2012 Intel Corporation
d1ff4b1c MG	7	*/
	8
	9	#include <linux/kernel.h>
d1ff4b1c MG	10	#include <linux/init.h>
	11	#include <linux/device.h>
	12	#include <linux/sysfs.h>
2223af38	13	#include <linux/efi-bgrt.h>
d1ff4b1c	14
7b0a9114	15	static void *bgrt_image;
d1ff4b1c MG	16	static struct kobject *bgrt_kobj;
d1ff4b1c MG	17
f37ccf8f NC	18	#define BGRT_SHOW(_name, _member) \
	19	static ssize_t _name##_show(struct kobject *kobj, \
	20	struct kobj_attribute attr, char buf) \
	21	{ \
6554ca9c	22	return sysfs_emit(buf, "%d\n", bgrt_tab._member); \
f37ccf8f	23	} \
db2d1693	24	static struct kobj_attribute bgrt_attr_##_name = __ATTR_RO(_name)
f37ccf8f NC	25
	26	BGRT_SHOW(version, version);
	27	BGRT_SHOW(status, status);
	28	BGRT_SHOW(type, image_type);
	29	BGRT_SHOW(xoffset, image_offset_x);
	30	BGRT_SHOW(yoffset, image_offset_y);
d1ff4b1c	31
65f44679	32	static ssize_t image_read(struct file file, struct kobject kobj,
d1ff4b1c MG	33	struct bin_attribute attr, char buf, loff_t off, size_t count)
d1ff4b1c MG	34	{
2223af38	35	memcpy(buf, attr->private + off, count);
d1ff4b1c MG	36	return count;
	37	}
	38
65f44679	39	static BIN_ATTR_RO(image, 0); /* size gets filled in later */
d1ff4b1c MG	40
d1ff4b1c MG	41	static struct attribute *bgrt_attributes[] = {
f37ccf8f NC	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,
d1ff4b1c MG	47	NULL,
	48	};
	49
65f44679 GK	50	static struct bin_attribute *bgrt_bin_attributes[] = {
	51	&bin_attr_image,
	52	NULL,
	53	};
	54
7e536269	55	static const struct attribute_group bgrt_attribute_group = {
d1ff4b1c	56	.attrs = bgrt_attributes,
65f44679	57	.bin_attrs = bgrt_bin_attributes,
d1ff4b1c MG	58	};
d1ff4b1c MG	59
6e7300cf BS	60	int __init acpi_parse_bgrt(struct acpi_table_header *table)
	61	{
	62	efi_bgrt_init(table);
	63	return 0;
	64	}
	65
d1ff4b1c MG	66	static int __init bgrt_init(void)
d1ff4b1c MG	67	{
d1ff4b1c	68	int ret;
d1ff4b1c	69
7b0a9114	70	if (!bgrt_tab.image_address)
d1ff4b1c MG	71	return -ENODEV;
d1ff4b1c MG	72
7b0a9114 DY	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
65f44679 GK	80	bin_attr_image.private = bgrt_image;
65f44679 GK	81	bin_attr_image.size = bgrt_image_size;
d1ff4b1c MG	82
d1ff4b1c MG	83	bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
7b0a9114 DY	84	if (!bgrt_kobj) {
	85	ret = -EINVAL;
	86	goto out_memmap;
	87	}
d1ff4b1c MG	88
	89	ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
	90	if (ret)
	91	goto out_kobject;
	92
d1ff4b1c MG	93	return 0;
d1ff4b1c MG	94
d1ff4b1c MG	95	out_kobject:
d1ff4b1c MG	96	kobject_put(bgrt_kobj);
7b0a9114 DY	97	out_memmap:
7b0a9114 DY	98	memunmap(bgrt_image);
d1ff4b1c MG	99	return ret;
d1ff4b1c MG	100	}
cc079f8c	101	device_initcall(bgrt_init);