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ACPI: Add support for exposing BGRT data
ACPI 5.0 adds the BGRT, a table that contains a pointer to the firmware boot splash and associated metadata. This simple driver exposes it via /sys/firmware/acpi in order to allow bootsplash applications to draw their splash around the firmware image and reduce the number of jarring graphical transitions during boot. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -1,3 +1,23 @@
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What: /sys/firmware/acpi/bgrt/
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Date: January 2012
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Contact: Matthew Garrett <mjg@redhat.com>
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Description:
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The BGRT is an ACPI 5.0 feature that allows the OS
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to obtain a copy of the firmware boot splash and
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some associated metadata. This is intended to be used
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by boot splash applications in order to interact with
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the firmware boot splash in order to avoid jarring
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transitions.
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image: The image bitmap. Currently a 32-bit BMP.
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status: 1 if the image is valid, 0 if firmware invalidated it.
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type: 0 indicates image is in BMP format.
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version: The version of the BGRT. Currently 1.
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xoffset: The number of pixels between the left of the screen
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and the left edge of the image.
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yoffset: The number of pixels between the top of the screen
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and the top edge of the image.
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What: /sys/firmware/acpi/interrupts/
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What: /sys/firmware/acpi/interrupts/
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Date: February 2008
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Date: February 2008
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Contact: Len Brown <lenb@kernel.org>
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Contact: Len Brown <lenb@kernel.org>
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@ -384,6 +384,15 @@ config ACPI_CUSTOM_METHOD
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load additional kernel modules after boot, this feature may be used
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load additional kernel modules after boot, this feature may be used
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to override that restriction).
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to override that restriction).
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config ACPI_BGRT
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tristate "Boottime Graphics Resource Table support"
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default n
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help
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This driver adds support for exposing the ACPI Boottime Graphics
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Resource Table, which allows the operating system to obtain
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data from the firmware boot splash. It will appear under
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/sys/firmware/acpi/bgrt/ .
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source "drivers/acpi/apei/Kconfig"
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source "drivers/acpi/apei/Kconfig"
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endif # ACPI
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endif # ACPI
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@ -62,6 +62,7 @@ obj-$(CONFIG_ACPI_SBS) += sbs.o
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obj-$(CONFIG_ACPI_HED) += hed.o
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obj-$(CONFIG_ACPI_HED) += hed.o
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obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o
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obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o
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obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
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obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
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obj-$(CONFIG_ACPI_BGRT) += bgrt.o
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# processor has its own "processor." module_param namespace
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# processor has its own "processor." module_param namespace
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processor-y := processor_driver.o processor_throttling.o
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processor-y := processor_driver.o processor_throttling.o
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175
drivers/acpi/bgrt.c
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175
drivers/acpi/bgrt.c
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/*
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* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.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 <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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static struct acpi_table_bgrt *bgrt_tab;
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static struct kobject *bgrt_kobj;
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struct bmp_header {
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u16 id;
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u32 size;
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} __attribute ((packed));
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static struct bmp_header bmp_header;
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static ssize_t show_version(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(version, S_IRUGO, show_version, NULL);
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static ssize_t show_status(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(status, S_IRUGO, show_status, NULL);
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static ssize_t show_type(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(type, S_IRUGO, show_type, NULL);
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static ssize_t show_xoffset(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(xoffset, S_IRUGO, show_xoffset, NULL);
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static ssize_t show_yoffset(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(yoffset, S_IRUGO, show_yoffset, NULL);
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static ssize_t show_image(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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int size = attr->size;
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void __iomem *image = attr->private;
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if (off >= size) {
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count = 0;
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} else {
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if (off + count > size)
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count = size - off;
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memcpy_fromio(buf, image+off, count);
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}
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return count;
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}
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static struct bin_attribute image_attr = {
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.attr = {
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.name = "image",
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.mode = S_IRUGO,
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},
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.read = show_image,
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};
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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 attribute_group bgrt_attribute_group = {
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.attrs = bgrt_attributes,
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};
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static int __init bgrt_init(void)
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{
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acpi_status status;
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int ret;
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void __iomem *bgrt;
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if (acpi_disabled)
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return -ENODEV;
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status = acpi_get_table("BGRT", 0,
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(struct acpi_table_header **)&bgrt_tab);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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sysfs_bin_attr_init(&image_attr);
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bgrt = ioremap(bgrt_tab->image_address, sizeof(struct bmp_header));
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if (!bgrt) {
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ret = -EINVAL;
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goto out_err;
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}
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memcpy_fromio(&bmp_header, bgrt, sizeof(bmp_header));
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image_attr.size = bmp_header.size;
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iounmap(bgrt);
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image_attr.private = ioremap(bgrt_tab->image_address, image_attr.size);
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if (!image_attr.private) {
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ret = -EINVAL;
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goto out_err;
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}
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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_iounmap;
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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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ret = sysfs_create_bin_file(bgrt_kobj, &image_attr);
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if (ret)
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goto out_group;
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return 0;
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out_group:
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sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
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out_kobject:
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kobject_put(bgrt_kobj);
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out_iounmap:
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iounmap(image_attr.private);
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out_err:
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return ret;
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}
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static void __exit bgrt_exit(void)
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{
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iounmap(image_attr.private);
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sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
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sysfs_remove_bin_file(bgrt_kobj, &image_attr);
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}
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module_init(bgrt_init);
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module_exit(bgrt_exit);
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MODULE_AUTHOR("Matthew Garrett");
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MODULE_DESCRIPTION("BGRT boot graphic support");
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MODULE_LICENSE("GPL");
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