| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * BGRT boot graphic support |
| 3 | * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org> |
| 4 | * Copyright 2012 Red Hat, Inc <mjg@redhat.com> |
| 5 | * Copyright 2012 Intel Corporation |
| 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> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/sysfs.h> |
| 16 | #include <linux/efi-bgrt.h> |
| 17 | |
| 18 | static void *bgrt_image; |
| 19 | static struct kobject *bgrt_kobj; |
| 20 | |
| 21 | static ssize_t show_version(struct device *dev, |
| 22 | struct device_attribute *attr, char *buf) |
| 23 | { |
| 24 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.version); |
| 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 | { |
| 31 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.status); |
| 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 | { |
| 38 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_type); |
| 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 | { |
| 45 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_x); |
| 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 | { |
| 52 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab.image_offset_y); |
| 53 | } |
| 54 | static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); |
| 55 | |
| 56 | static ssize_t image_read(struct file *file, struct kobject *kobj, |
| 57 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
| 58 | { |
| 59 | memcpy(buf, attr->private + off, count); |
| 60 | return count; |
| 61 | } |
| 62 | |
| 63 | static BIN_ATTR_RO(image, 0); /* size gets filled in later */ |
| 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 | |
| 74 | static struct bin_attribute *bgrt_bin_attributes[] = { |
| 75 | &bin_attr_image, |
| 76 | NULL, |
| 77 | }; |
| 78 | |
| 79 | static const struct attribute_group bgrt_attribute_group = { |
| 80 | .attrs = bgrt_attributes, |
| 81 | .bin_attrs = bgrt_bin_attributes, |
| 82 | }; |
| 83 | |
| 84 | int __init acpi_parse_bgrt(struct acpi_table_header *table) |
| 85 | { |
| 86 | efi_bgrt_init(table); |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static int __init bgrt_init(void) |
| 91 | { |
| 92 | int ret; |
| 93 | |
| 94 | if (!bgrt_tab.image_address) |
| 95 | return -ENODEV; |
| 96 | |
| 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 | |
| 104 | bin_attr_image.private = bgrt_image; |
| 105 | bin_attr_image.size = bgrt_image_size; |
| 106 | |
| 107 | bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); |
| 108 | if (!bgrt_kobj) { |
| 109 | ret = -EINVAL; |
| 110 | goto out_memmap; |
| 111 | } |
| 112 | |
| 113 | ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); |
| 114 | if (ret) |
| 115 | goto out_kobject; |
| 116 | |
| 117 | return 0; |
| 118 | |
| 119 | out_kobject: |
| 120 | kobject_put(bgrt_kobj); |
| 121 | out_memmap: |
| 122 | memunmap(bgrt_image); |
| 123 | return ret; |
| 124 | } |
| 125 | device_initcall(bgrt_init); |