diff options
Diffstat (limited to 'drivers/acpi/bgrt.c')
| -rw-r--r-- | drivers/acpi/bgrt.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/acpi/bgrt.c b/drivers/acpi/bgrt.c new file mode 100644 index 00000000000..8cf6c46e99f --- /dev/null +++ b/drivers/acpi/bgrt.c @@ -0,0 +1,175 @@ +/* + * Copyright 2012 Red Hat, Inc <mjg@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/sysfs.h> +#include <acpi/acpi.h> +#include <acpi/acpi_bus.h> + +static struct acpi_table_bgrt *bgrt_tab; +static struct kobject *bgrt_kobj; + +struct bmp_header { + u16 id; + u32 size; +} __attribute ((packed)); + +static struct bmp_header bmp_header; + +static ssize_t show_version(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version); +} +static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); + +static ssize_t show_status(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status); +} +static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); + +static ssize_t show_type(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type); +} +static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); + +static ssize_t show_xoffset(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x); +} +static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL); + +static ssize_t show_yoffset(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y); +} +static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); + +static ssize_t show_image(struct file *file, struct kobject *kobj, + struct bin_attribute *attr, char *buf, loff_t off, size_t count) +{ + int size = attr->size; + void __iomem *image = attr->private; + + if (off >= size) { + count = 0; + } else { + if (off + count > size) + count = size - off; + + memcpy_fromio(buf, image+off, count); + } + + return count; +} + +static struct bin_attribute image_attr = { + .attr = { + .name = "image", + .mode = S_IRUGO, + }, + .read = show_image, +}; + +static struct attribute *bgrt_attributes[] = { + &dev_attr_version.attr, + &dev_attr_status.attr, + &dev_attr_type.attr, + &dev_attr_xoffset.attr, + &dev_attr_yoffset.attr, + NULL, +}; + +static struct attribute_group bgrt_attribute_group = { + .attrs = bgrt_attributes, +}; + +static int __init bgrt_init(void) +{ + acpi_status status; + int ret; + void __iomem *bgrt; + + if (acpi_disabled) + return -ENODEV; + + status = acpi_get_table("BGRT", 0, + (struct acpi_table_header **)&bgrt_tab); + + if (ACPI_FAILURE(status)) + return -ENODEV; + + sysfs_bin_attr_init(&image_attr); + + bgrt = ioremap(bgrt_tab->image_address, sizeof(struct bmp_header)); + + if (!bgrt) { + ret = -EINVAL; + goto out_err; + } + + memcpy_fromio(&bmp_header, bgrt, sizeof(bmp_header)); + image_attr.size = bmp_header.size; + iounmap(bgrt); + + image_attr.private = ioremap(bgrt_tab->image_address, image_attr.size); + + if (!image_attr.private) { + ret = -EINVAL; + goto out_err; + } + + + bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); + if (!bgrt_kobj) { + ret = -EINVAL; + goto out_iounmap; + } + + ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); + if (ret) + goto out_kobject; + + ret = sysfs_create_bin_file(bgrt_kobj, &image_attr); + if (ret) + goto out_group; + + return 0; + +out_group: + sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); +out_kobject: + kobject_put(bgrt_kobj); +out_iounmap: + iounmap(image_attr.private); +out_err: + return ret; +} + +static void __exit bgrt_exit(void) +{ + iounmap(image_attr.private); + sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); + sysfs_remove_bin_file(bgrt_kobj, &image_attr); +} + +module_init(bgrt_init); +module_exit(bgrt_exit); + +MODULE_AUTHOR("Matthew Garrett"); +MODULE_DESCRIPTION("BGRT boot graphic support"); +MODULE_LICENSE("GPL"); |