[people/arne_f/kernel.git] / drivers / acpi / bgrt.c

/*
 * BGRT boot graphic support
 * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
 * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
 * Copyright 2012 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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;

static ssize_t show_version(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
}
static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);

static ssize_t show_status(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
}
static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);

static ssize_t show_type(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
}
static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);

static ssize_t show_xoffset(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
}
static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);

static ssize_t show_yoffset(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
}
static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);

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[] = {
	&dev_attr_version.attr,
	&dev_attr_status.attr,
	&dev_attr_type.attr,
	&dev_attr_xoffset.attr,
	&dev_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
d1ff4b1c	1	/*
cc079f8c PG	2	* BGRT boot graphic support
cc079f8c PG	3	* Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
d1ff4b1c	4	* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
2223af38	5	* Copyright 2012 Intel Corporation
d1ff4b1c MG	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>
d1ff4b1c MG	13	#include <linux/init.h>
	14	#include <linux/device.h>
	15	#include <linux/sysfs.h>
2223af38	16	#include <linux/efi-bgrt.h>
d1ff4b1c	17
7b0a9114	18	static void *bgrt_image;
d1ff4b1c MG	19	static struct kobject *bgrt_kobj;
d1ff4b1c MG	20
d1ff4b1c MG	21	static ssize_t show_version(struct device *dev,
	22	struct device_attribute attr, char buf)
	23	{
7b0a9114	24	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
d1ff4b1c MG	25	}
	26	static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
	27
	28	static ssize_t show_status(struct device *dev,
	29	struct device_attribute attr, char buf)
	30	{
7b0a9114	31	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
d1ff4b1c MG	32	}
	33	static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
	34
	35	static ssize_t show_type(struct device *dev,
	36	struct device_attribute attr, char buf)
	37	{
7b0a9114	38	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
d1ff4b1c MG	39	}
	40	static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
	41
	42	static ssize_t show_xoffset(struct device *dev,
	43	struct device_attribute attr, char buf)
	44	{
7b0a9114	45	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
d1ff4b1c MG	46	}
	47	static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
	48
	49	static ssize_t show_yoffset(struct device *dev,
	50	struct device_attribute attr, char buf)
	51	{
7b0a9114	52	return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
d1ff4b1c MG	53	}
	54	static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
	55
65f44679	56	static ssize_t image_read(struct file file, struct kobject kobj,
d1ff4b1c MG	57	struct bin_attribute attr, char buf, loff_t off, size_t count)
d1ff4b1c MG	58	{
2223af38	59	memcpy(buf, attr->private + off, count);
d1ff4b1c MG	60	return count;
	61	}
	62
65f44679	63	static BIN_ATTR_RO(image, 0); /* size gets filled in later */
d1ff4b1c MG	64
	65	static 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
65f44679 GK	74	static struct bin_attribute *bgrt_bin_attributes[] = {
	75	&bin_attr_image,
	76	NULL,
	77	};
	78
7e536269	79	static const struct attribute_group bgrt_attribute_group = {
d1ff4b1c	80	.attrs = bgrt_attributes,
65f44679	81	.bin_attrs = bgrt_bin_attributes,
d1ff4b1c MG	82	};
d1ff4b1c MG	83
6e7300cf BS	84	int __init acpi_parse_bgrt(struct acpi_table_header *table)
	85	{
	86	efi_bgrt_init(table);
	87	return 0;
	88	}
	89
d1ff4b1c MG	90	static int __init bgrt_init(void)
d1ff4b1c MG	91	{
d1ff4b1c	92	int ret;
d1ff4b1c	93
7b0a9114	94	if (!bgrt_tab.image_address)
d1ff4b1c MG	95	return -ENODEV;
d1ff4b1c MG	96
7b0a9114 DY	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
65f44679 GK	104	bin_attr_image.private = bgrt_image;
65f44679 GK	105	bin_attr_image.size = bgrt_image_size;
d1ff4b1c MG	106
d1ff4b1c MG	107	bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
7b0a9114 DY	108	if (!bgrt_kobj) {
	109	ret = -EINVAL;
	110	goto out_memmap;
	111	}
d1ff4b1c MG	112
	113	ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
	114	if (ret)
	115	goto out_kobject;
	116
d1ff4b1c MG	117	return 0;
d1ff4b1c MG	118
d1ff4b1c MG	119	out_kobject:
d1ff4b1c MG	120	kobject_put(bgrt_kobj);
7b0a9114 DY	121	out_memmap:
7b0a9114 DY	122	memunmap(bgrt_image);
d1ff4b1c MG	123	return ret;
d1ff4b1c MG	124	}
cc079f8c	125	device_initcall(bgrt_init);