Release 4.12 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);
}
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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);
}
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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);
}
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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);
}
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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);
}
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Dave Young
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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;
}

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Josh Triplett
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Greg Kroah-Hartman
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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 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;
}

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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;
}
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Dave Young
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Josh Triplett
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Greg Kroah-Hartman
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device_initcall(bgrt_init);
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Dave Young
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Greg Kroah-Hartman
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Bhupesh Sharma
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3.59%
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Josh Triplett
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Paul Gortmaker
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Directory: drivers/acpi

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