1 /* 2 * Copyright 2012 Red Hat, Inc <mjg@redhat.com> 3 * Copyright 2012 Intel Corporation 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/device.h> 14 #include <linux/sysfs.h> 15 #include <linux/efi-bgrt.h> 16 17 static struct kobject *bgrt_kobj; 18 19 static ssize_t show_version(struct device *dev, 20 struct device_attribute *attr, char *buf) 21 { 22 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version); 23 } 24 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 25 26 static ssize_t show_status(struct device *dev, 27 struct device_attribute *attr, char *buf) 28 { 29 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status); 30 } 31 static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); 32 33 static ssize_t show_type(struct device *dev, 34 struct device_attribute *attr, char *buf) 35 { 36 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type); 37 } 38 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); 39 40 static ssize_t show_xoffset(struct device *dev, 41 struct device_attribute *attr, char *buf) 42 { 43 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x); 44 } 45 static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL); 46 47 static ssize_t show_yoffset(struct device *dev, 48 struct device_attribute *attr, char *buf) 49 { 50 return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y); 51 } 52 static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); 53 54 static ssize_t show_image(struct file *file, struct kobject *kobj, 55 struct bin_attribute *attr, char *buf, loff_t off, size_t count) 56 { 57 memcpy(buf, attr->private + off, count); 58 return count; 59 } 60 61 static struct bin_attribute image_attr = { 62 .attr = { 63 .name = "image", 64 .mode = S_IRUGO, 65 }, 66 .read = show_image, 67 }; 68 69 static struct attribute *bgrt_attributes[] = { 70 &dev_attr_version.attr, 71 &dev_attr_status.attr, 72 &dev_attr_type.attr, 73 &dev_attr_xoffset.attr, 74 &dev_attr_yoffset.attr, 75 NULL, 76 }; 77 78 static struct attribute_group bgrt_attribute_group = { 79 .attrs = bgrt_attributes, 80 }; 81 82 static int __init bgrt_init(void) 83 { 84 int ret; 85 86 if (!bgrt_image) 87 return -ENODEV; 88 89 sysfs_bin_attr_init(&image_attr); 90 image_attr.private = bgrt_image; 91 image_attr.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 ret = sysfs_create_bin_file(bgrt_kobj, &image_attr); 102 if (ret) 103 goto out_group; 104 105 return 0; 106 107 out_group: 108 sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); 109 out_kobject: 110 kobject_put(bgrt_kobj); 111 return ret; 112 } 113 114 module_init(bgrt_init); 115 116 MODULE_AUTHOR("Matthew Garrett, Josh Triplett <josh@joshtriplett.org>"); 117 MODULE_DESCRIPTION("BGRT boot graphic support"); 118 MODULE_LICENSE("GPL"); 119