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-rw-r--r--drivers/acpi/bgrt.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/acpi/bgrt.c b/drivers/acpi/bgrt.c
new file mode 100644
index 0000000000..e4fb9e225d
--- /dev/null
+++ b/drivers/acpi/bgrt.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * BGRT boot graphic support
+ * Authors: Matthew Garrett, Josh Triplett <josh@joshtriplett.org>
+ * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
+ * Copyright 2012 Intel Corporation
+ */
+
+#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;
+
+#define BGRT_SHOW(_name, _member) \
+ static ssize_t _name##_show(struct kobject *kobj, \
+ struct kobj_attribute *attr, char *buf) \
+ { \
+ return sysfs_emit(buf, "%d\n", bgrt_tab._member); \
+ } \
+ static struct kobj_attribute bgrt_attr_##_name = __ATTR_RO(_name)
+
+BGRT_SHOW(version, version);
+BGRT_SHOW(status, status);
+BGRT_SHOW(type, image_type);
+BGRT_SHOW(xoffset, image_offset_x);
+BGRT_SHOW(yoffset, image_offset_y);
+
+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[] = {
+ &bgrt_attr_version.attr,
+ &bgrt_attr_status.attr,
+ &bgrt_attr_type.attr,
+ &bgrt_attr_xoffset.attr,
+ &bgrt_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);