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122 lines
2.8 KiB
122 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* BGRT boot graphic support |
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* Authors: Matthew Garrett, Josh Triplett <[email protected]> |
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* Copyright 2012 Red Hat, Inc <[email protected]> |
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* Copyright 2012 Intel Corporation |
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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 version_show(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_RO(version); |
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static ssize_t status_show(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_RO(status); |
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static ssize_t type_show(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_RO(type); |
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static ssize_t xoffset_show(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_RO(xoffset); |
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static ssize_t yoffset_show(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_RO(yoffset); |
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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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