2 * RouterBoot helper routines
4 * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
11 #define pr_fmt(fmt) "rb: " fmt
13 #include <linux/kernel.h>
14 #include <linux/kobject.h>
15 #include <linux/slab.h>
16 #include <linux/errno.h>
17 #include <linux/routerboot.h>
18 #include <linux/rle.h>
19 #include <linux/lzo.h>
21 #include "routerboot.h"
23 #define RB_BLOCK_SIZE 0x1000
24 #define RB_ART_SIZE 0x10000
25 #define RB_MAGIC_ERD 0x00455244 /* extended radio data */
27 static struct rb_info rb_info;
29 static u32 get_u32(void *buf)
33 return ((u32) p[3] + ((u32) p[2] << 8) + ((u32) p[1] << 16) +
37 static u16 get_u16(void *buf)
41 return (u16) p[1] + ((u16) p[0] << 8);
45 routerboot_find_magic(u8 *buf, unsigned int buflen, u32 *offset, bool hard)
47 u32 magic_ref = hard ? RB_MAGIC_HARD : RB_MAGIC_SOFT;
51 while (cur < buflen) {
52 magic = get_u32(buf + cur);
53 if (magic == magic_ref) {
65 routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
66 u8 **tag_data, u16 *tag_len)
81 /* skip magic value */
90 /* skip magic and CRC value */
116 if (id == RB_ID_TERMINATOR)
142 rb_find_hard_cfg_tag(u16 tag_id, u8 **tag_data, u16 *tag_len)
144 if (!rb_info.hard_cfg_data ||
145 !rb_info.hard_cfg_size)
148 return routerboot_find_tag(rb_info.hard_cfg_data,
149 rb_info.hard_cfg_size,
150 tag_id, tag_data, tag_len);
154 rb_get_board_name(void)
160 err = rb_find_hard_cfg_tag(RB_ID_BOARD_NAME, &tag, &tag_len);
168 rb_get_hw_options(void)
174 err = rb_find_hard_cfg_tag(RB_ID_HW_OPTIONS, &tag, &tag_len);
182 __rb_get_wlan_data(u16 id)
192 err = rb_find_hard_cfg_tag(RB_ID_WLAN_DATA, &tag, &tag_len);
194 pr_err("no calibration data found\n");
198 buf = kmalloc(RB_ART_SIZE, GFP_KERNEL);
200 pr_err("no memory for calibration data\n");
204 magic = get_u32(tag);
205 if (magic == RB_MAGIC_ERD) {
212 err = routerboot_find_tag(tag, tag_len, id,
213 &erd_data, &erd_len);
215 pr_err("no ERD data found for id %u\n", id);
219 dst_done = RB_ART_SIZE;
220 err = lzo1x_decompress_safe(erd_data, erd_len, buf, &dst_done);
222 pr_err("unable to decompress calibration data %d\n",
230 err = rle_decode((char *) tag, tag_len, buf, RB_ART_SIZE,
231 &src_done, &dst_done);
233 pr_err("unable to decode calibration data\n");
247 rb_get_wlan_data(void)
249 return __rb_get_wlan_data(0);
253 rb_get_ext_wlan_data(u16 id)
255 return __rb_get_wlan_data(id);
258 __init const struct rb_info *
259 rb_init_info(void *data, unsigned int size)
263 if (size == 0 || (size % RB_BLOCK_SIZE) != 0)
266 for (offset = 0; offset < size; offset += RB_BLOCK_SIZE) {
269 magic = get_u32(data + offset);
272 rb_info.hard_cfg_offs = offset;
276 rb_info.soft_cfg_offs = offset;
281 if (!rb_info.hard_cfg_offs) {
282 pr_err("could not find a valid RouterBOOT hard config\n");
286 if (!rb_info.soft_cfg_offs) {
287 pr_err("could not find a valid RouterBOOT soft config\n");
291 rb_info.hard_cfg_size = RB_BLOCK_SIZE;
292 rb_info.hard_cfg_data = kmemdup(data + rb_info.hard_cfg_offs,
293 RB_BLOCK_SIZE, GFP_KERNEL);
294 if (!rb_info.hard_cfg_data)
297 rb_info.board_name = rb_get_board_name();
298 rb_info.hw_options = rb_get_hw_options();
303 static char *rb_ext_wlan_data;
306 rb_ext_wlan_data_read(struct file *filp, struct kobject *kobj,
307 struct bin_attribute *attr, char *buf,
308 loff_t off, size_t count)
310 if (off + count > attr->size)
313 memcpy(buf, &rb_ext_wlan_data[off], count);
318 static const struct bin_attribute rb_ext_wlan_data_attr = {
320 .name = "ext_wlan_data",
321 .mode = S_IRUSR | S_IWUSR,
323 .read = rb_ext_wlan_data_read,
327 static int __init rb_sysfs_init(void)
329 struct kobject *rb_kobj;
332 rb_ext_wlan_data = rb_get_ext_wlan_data(1);
333 if (rb_ext_wlan_data == NULL)
336 rb_kobj = kobject_create_and_add("routerboot", firmware_kobj);
337 if (rb_kobj == NULL) {
339 pr_err("unable to create sysfs entry\n");
340 goto err_free_wlan_data;
343 ret = sysfs_create_bin_file(rb_kobj, &rb_ext_wlan_data_attr);
345 pr_err("unable to create sysfs file, %d\n", ret);
352 kobject_put(rb_kobj);
354 kfree(rb_ext_wlan_data);
358 late_initcall(rb_sysfs_init);