/* * 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);