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 struct kobject *bgrt_kobj; 19 20 static ssize_t show_version(struct device *dev, 21 struct device_attribute *attr, char *buf) 22 { 23 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version); 24 } 25 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 26 27 static ssize_t show_status(struct device *dev, 28 struct device_attribute *attr, char *buf) 29 { 30 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status); 31 } 32 static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); 33 34 static ssize_t show_type(struct device *dev, 35 struct device_attribute *attr, char *buf) 36 { 37 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type); 38 } 39 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); 40 41 static ssize_t show_xoffset(struct device *dev, 42 struct device_attribute *attr, char *buf) 43 { 44 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x); 45 } 46 static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL); 47 48 static ssize_t show_yoffset(struct device *dev, 49 struct device_attribute *attr, char *buf) 50 { 51 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y); 52 } 53 static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); 54 55 static ssize_t image_read(struct file *file, struct kobject *kobj, 56 struct bin_attribute *attr, char *buf, loff_t off, size_t count) 57 { 58 memcpy(buf, attr->private + off, count); 59 return count; 60 } 61 62 static BIN_ATTR_RO(image, 0); /* size gets filled in later */ 63 64 static struct attribute *bgrt_attributes[] = { 65 &dev_attr_version.attr, 66 &dev_attr_status.attr, 67 &dev_attr_type.attr, 68 &dev_attr_xoffset.attr, 69 &dev_attr_yoffset.attr, 70 NULL, 71 }; 72 73 static struct bin_attribute *bgrt_bin_attributes[] = { 74 &bin_attr_image, 75 NULL, 76 }; 77 78 static struct attribute_group bgrt_attribute_group = { 79 .attrs = bgrt_attributes, 80 .bin_attrs = bgrt_bin_attributes, 81 }; 82 83 static int __init bgrt_init(void) 84 { 85 int ret; 86 87 if (!bgrt_image) 88 return -ENODEV; 89 90 bin_attr_image.private = bgrt_image; 91 bin_attr_image.size = bgrt_image_size; 92 93 bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); 94 if (!bgrt_kobj) 95 return -EINVAL; 96 97 ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); 98 if (ret) 99 goto out_kobject; 100 101 return 0; 102 103 out_kobject: 104 kobject_put(bgrt_kobj); 105 return ret; 106 } 107 device_initcall(bgrt_init); 108