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| 1 | /* |
| 2 | * Copyright 2012 Red Hat, Inc <mjg@redhat.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/sysfs.h> |
| 14 | #include <linux/io.h> |
| 15 | #include <acpi/acpi.h> |
| 16 | #include <acpi/acpi_bus.h> |
| 17 | |
| 18 | static struct acpi_table_bgrt *bgrt_tab; |
| 19 | static struct kobject *bgrt_kobj; |
| 20 | |
| 21 | struct bmp_header { |
| 22 | u16 id; |
| 23 | u32 size; |
| 24 | } __attribute ((packed)); |
| 25 | |
| 26 | static struct bmp_header bmp_header; |
| 27 | |
| 28 | static ssize_t show_version(struct device *dev, |
| 29 | struct device_attribute *attr, char *buf) |
| 30 | { |
| 31 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version); |
| 32 | } |
| 33 | static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); |
| 34 | |
| 35 | static ssize_t show_status(struct device *dev, |
| 36 | struct device_attribute *attr, char *buf) |
| 37 | { |
| 38 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status); |
| 39 | } |
| 40 | static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); |
| 41 | |
| 42 | static ssize_t show_type(struct device *dev, |
| 43 | struct device_attribute *attr, char *buf) |
| 44 | { |
| 45 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type); |
| 46 | } |
| 47 | static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); |
| 48 | |
| 49 | static ssize_t show_xoffset(struct device *dev, |
| 50 | struct device_attribute *attr, char *buf) |
| 51 | { |
| 52 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x); |
| 53 | } |
| 54 | static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL); |
| 55 | |
| 56 | static ssize_t show_yoffset(struct device *dev, |
| 57 | struct device_attribute *attr, char *buf) |
| 58 | { |
| 59 | return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y); |
| 60 | } |
| 61 | static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL); |
| 62 | |
| 63 | static ssize_t show_image(struct file *file, struct kobject *kobj, |
| 64 | struct bin_attribute *attr, char *buf, loff_t off, size_t count) |
| 65 | { |
| 66 | int size = attr->size; |
| 67 | void __iomem *image = attr->private; |
| 68 | |
| 69 | if (off >= size) { |
| 70 | count = 0; |
| 71 | } else { |
| 72 | if (off + count > size) |
| 73 | count = size - off; |
| 74 | |
| 75 | memcpy_fromio(buf, image+off, count); |
| 76 | } |
| 77 | |
| 78 | return count; |
| 79 | } |
| 80 | |
| 81 | static struct bin_attribute image_attr = { |
| 82 | .attr = { |
| 83 | .name = "image", |
| 84 | .mode = S_IRUGO, |
| 85 | }, |
| 86 | .read = show_image, |
| 87 | }; |
| 88 | |
| 89 | static struct attribute *bgrt_attributes[] = { |
| 90 | &dev_attr_version.attr, |
| 91 | &dev_attr_status.attr, |
| 92 | &dev_attr_type.attr, |
| 93 | &dev_attr_xoffset.attr, |
| 94 | &dev_attr_yoffset.attr, |
| 95 | NULL, |
| 96 | }; |
| 97 | |
| 98 | static struct attribute_group bgrt_attribute_group = { |
| 99 | .attrs = bgrt_attributes, |
| 100 | }; |
| 101 | |
| 102 | static int __init bgrt_init(void) |
| 103 | { |
| 104 | acpi_status status; |
| 105 | int ret; |
| 106 | void __iomem *bgrt; |
| 107 | |
| 108 | if (acpi_disabled) |
| 109 | return -ENODEV; |
| 110 | |
| 111 | status = acpi_get_table("BGRT", 0, |
| 112 | (struct acpi_table_header **)&bgrt_tab); |
| 113 | |
| 114 | if (ACPI_FAILURE(status)) |
| 115 | return -ENODEV; |
| 116 | |
| 117 | sysfs_bin_attr_init(&image_attr); |
| 118 | |
| 119 | bgrt = ioremap(bgrt_tab->image_address, sizeof(struct bmp_header)); |
| 120 | |
| 121 | if (!bgrt) { |
| 122 | ret = -EINVAL; |
| 123 | goto out_err; |
| 124 | } |
| 125 | |
| 126 | memcpy_fromio(&bmp_header, bgrt, sizeof(bmp_header)); |
| 127 | image_attr.size = bmp_header.size; |
| 128 | iounmap(bgrt); |
| 129 | |
| 130 | image_attr.private = ioremap(bgrt_tab->image_address, image_attr.size); |
| 131 | |
| 132 | if (!image_attr.private) { |
| 133 | ret = -EINVAL; |
| 134 | goto out_err; |
| 135 | } |
| 136 | |
| 137 | |
| 138 | bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj); |
| 139 | if (!bgrt_kobj) { |
| 140 | ret = -EINVAL; |
| 141 | goto out_iounmap; |
| 142 | } |
| 143 | |
| 144 | ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group); |
| 145 | if (ret) |
| 146 | goto out_kobject; |
| 147 | |
| 148 | ret = sysfs_create_bin_file(bgrt_kobj, &image_attr); |
| 149 | if (ret) |
| 150 | goto out_group; |
| 151 | |
| 152 | return 0; |
| 153 | |
| 154 | out_group: |
| 155 | sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); |
| 156 | out_kobject: |
| 157 | kobject_put(bgrt_kobj); |
| 158 | out_iounmap: |
| 159 | iounmap(image_attr.private); |
| 160 | out_err: |
| 161 | return ret; |
| 162 | } |
| 163 | |
| 164 | static void __exit bgrt_exit(void) |
| 165 | { |
| 166 | iounmap(image_attr.private); |
| 167 | sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group); |
| 168 | sysfs_remove_bin_file(bgrt_kobj, &image_attr); |
| 169 | } |
| 170 | |
| 171 | module_init(bgrt_init); |
| 172 | module_exit(bgrt_exit); |
| 173 | |
| 174 | MODULE_AUTHOR("Matthew Garrett"); |
| 175 | MODULE_DESCRIPTION("BGRT boot graphic support"); |
| 176 | MODULE_LICENSE("GPL"); |
| 177 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
