126 строки
3.0 KiB
C
126 строки
3.0 KiB
C
/*
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* BGRT boot graphic support
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* Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
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* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
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* Copyright 2012 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/efi-bgrt.h>
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static void *bgrt_image;
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static struct kobject *bgrt_kobj;
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static ssize_t show_version(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version);
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}
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static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
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static ssize_t show_status(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status);
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}
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static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
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static ssize_t show_type(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type);
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}
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static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
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static ssize_t show_xoffset(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x);
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}
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static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
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static ssize_t show_yoffset(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y);
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}
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static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
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static ssize_t image_read(struct file *file, struct kobject *kobj,
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struct bin_attribute *attr, char *buf, loff_t off, size_t count)
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{
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memcpy(buf, attr->private + off, count);
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return count;
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}
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static BIN_ATTR_RO(image, 0); /* size gets filled in later */
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static struct attribute *bgrt_attributes[] = {
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&dev_attr_version.attr,
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&dev_attr_status.attr,
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&dev_attr_type.attr,
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&dev_attr_xoffset.attr,
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&dev_attr_yoffset.attr,
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NULL,
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};
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static struct bin_attribute *bgrt_bin_attributes[] = {
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&bin_attr_image,
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NULL,
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};
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static const struct attribute_group bgrt_attribute_group = {
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.attrs = bgrt_attributes,
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.bin_attrs = bgrt_bin_attributes,
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};
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int __init acpi_parse_bgrt(struct acpi_table_header *table)
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{
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efi_bgrt_init(table);
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return 0;
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}
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static int __init bgrt_init(void)
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{
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int ret;
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if (!bgrt_tab.image_address)
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return -ENODEV;
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bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
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MEMREMAP_WB);
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if (!bgrt_image) {
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pr_notice("Ignoring BGRT: failed to map image memory\n");
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return -ENOMEM;
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}
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bin_attr_image.private = bgrt_image;
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bin_attr_image.size = bgrt_image_size;
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bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
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if (!bgrt_kobj) {
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ret = -EINVAL;
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goto out_memmap;
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}
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ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
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if (ret)
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goto out_kobject;
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return 0;
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out_kobject:
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kobject_put(bgrt_kobj);
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out_memmap:
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memunmap(bgrt_image);
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return ret;
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}
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device_initcall(bgrt_init);
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