| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * BGRT boot graphic support |
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| 4 | * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org> |
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| 5 | * Copyright 2012 Red Hat, Inc <mjg@redhat.com> |
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| 6 | * Copyright 2012 Intel Corporation |
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| 7 | */ |
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| 8 | |
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| 9 | #include <linux/kernel.h> |
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| 10 | #include <linux/init.h> |
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| 11 | #include <linux/device.h> |
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| 12 | #include <linux/sysfs.h> |
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| 13 | #include <linux/efi-bgrt.h> |
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| 14 | |
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| 15 | static void *bgrt_image; |
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| 16 | static struct kobject *bgrt_kobj; |
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| 17 | |
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| 18 | #define BGRT_SHOW(_name, _member) \ |
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| 19 | static ssize_t _name##_show(struct kobject *kobj, \ |
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| 20 | struct kobj_attribute *attr, char *buf) \ |
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| 21 | { \ |
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| 22 | return sysfs_emit(buf, "%d\n", bgrt_tab._member); \ |
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| 23 | } \ |
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| 24 | static struct kobj_attribute bgrt_attr_##_name = __ATTR_RO(_name) |
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| 25 | |
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| 26 | BGRT_SHOW(version, version); |
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| 27 | BGRT_SHOW(status, status); |
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| 28 | BGRT_SHOW(type, image_type); |
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| 29 | BGRT_SHOW(xoffset, image_offset_x); |
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| 30 | BGRT_SHOW(yoffset, image_offset_y); |
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| 31 | |
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| 32 | static ssize_t image_read(struct file *file, struct kobject *kobj, |
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| 33 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
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| 34 | { |
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| 35 | memcpy(buf, attr->private + off, count); |
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| 36 | return count; |
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| 37 | } |
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| 38 | |
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| 39 | static BIN_ATTR_RO(image, 0); /* size gets filled in later */ |
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| 40 | |
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| 41 | static struct attribute *bgrt_attributes[] = { |
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| 42 | &bgrt_attr_version.attr, |
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| 43 | &bgrt_attr_status.attr, |
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| 44 | &bgrt_attr_type.attr, |
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| 45 | &bgrt_attr_xoffset.attr, |
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| 46 | &bgrt_attr_yoffset.attr, |
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| 47 | NULL, |
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| 48 | }; |
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| 49 | |
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| 50 | static struct bin_attribute *bgrt_bin_attributes[] = { |
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| 51 | &bin_attr_image, |
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| 52 | NULL, |
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| 53 | }; |
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| 54 | |
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| 55 | static const struct attribute_group bgrt_attribute_group = { |
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| 56 | .attrs = bgrt_attributes, |
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| 57 | .bin_attrs = bgrt_bin_attributes, |
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| 58 | }; |
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| 59 | |
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| 60 | int __init acpi_parse_bgrt(struct acpi_table_header *table) |
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| 61 | { |
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| 62 | efi_bgrt_init(table); |
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| 63 | return 0; |
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| 64 | } |
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| 65 | |
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| 66 | static int __init bgrt_init(void) |
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| 67 | { |
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| 68 | int ret; |
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| 69 | |
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| 70 | if (!bgrt_tab.image_address) |
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| 71 | return -ENODEV; |
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| 72 | |
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| 73 | bgrt_image = memremap(offset: bgrt_tab.image_address, size: bgrt_image_size, |
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| 74 | flags: MEMREMAP_WB); |
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| 75 | if (!bgrt_image) { |
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| 76 | pr_notice("Ignoring BGRT: failed to map image memory\n" ); |
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| 77 | return -ENOMEM; |
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| 78 | } |
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| 79 | |
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| 80 | bin_attr_image.private = bgrt_image; |
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| 81 | bin_attr_image.size = bgrt_image_size; |
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| 82 | |
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| 83 | bgrt_kobj = kobject_create_and_add(name: "bgrt" , parent: acpi_kobj); |
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| 84 | if (!bgrt_kobj) { |
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| 85 | ret = -EINVAL; |
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| 86 | goto out_memmap; |
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| 87 | } |
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| 88 | |
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| 89 | ret = sysfs_create_group(kobj: bgrt_kobj, grp: &bgrt_attribute_group); |
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| 90 | if (ret) |
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| 91 | goto out_kobject; |
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| 92 | |
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| 93 | return 0; |
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| 94 | |
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| 95 | out_kobject: |
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| 96 | kobject_put(kobj: bgrt_kobj); |
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| 97 | out_memmap: |
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| 98 | memunmap(addr: bgrt_image); |
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| 99 | return ret; |
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| 100 | } |
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| 101 | device_initcall(bgrt_init); |
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| 102 | |
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