OpenWrt – Blame information for rev 4

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4 office 1 /*
2 * RouterBoot helper routines
3 *
4 * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
5 *
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.
9 */
10  
11 #define pr_fmt(fmt) "rb: " fmt
12  
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>
20  
21 #include "routerboot.h"
22  
23 #define RB_BLOCK_SIZE 0x1000
24 #define RB_ART_SIZE 0x10000
25 #define RB_MAGIC_ERD 0x00455244 /* extended radio data */
26  
27 static struct rb_info rb_info;
28  
29 static u32 get_u32(void *buf)
30 {
31 u8 *p = buf;
32  
33 return ((u32) p[3] + ((u32) p[2] << 8) + ((u32) p[1] << 16) +
34 ((u32) p[0] << 24));
35 }
36  
37 static u16 get_u16(void *buf)
38 {
39 u8 *p = buf;
40  
41 return (u16) p[1] + ((u16) p[0] << 8);
42 }
43  
44 __init int
45 routerboot_find_magic(u8 *buf, unsigned int buflen, u32 *offset, bool hard)
46 {
47 u32 magic_ref = hard ? RB_MAGIC_HARD : RB_MAGIC_SOFT;
48 u32 magic;
49 u32 cur = *offset;
50  
51 while (cur < buflen) {
52 magic = get_u32(buf + cur);
53 if (magic == magic_ref) {
54 *offset = cur;
55 return 0;
56 }
57  
58 cur += 0x1000;
59 }
60  
61 return -ENOENT;
62 }
63  
64 __init int
65 routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
66 u8 **tag_data, u16 *tag_len)
67 {
68 uint32_t magic;
69 bool align = false;
70 int ret;
71  
72 if (buflen < 4)
73 return -EINVAL;
74  
75 magic = get_u32(buf);
76 switch (magic) {
77 case RB_MAGIC_ERD:
78 align = true;
79 /* fall trough */
80 case RB_MAGIC_HARD:
81 /* skip magic value */
82 buf += 4;
83 buflen -= 4;
84 break;
85  
86 case RB_MAGIC_SOFT:
87 if (buflen < 8)
88 return -EINVAL;
89  
90 /* skip magic and CRC value */
91 buf += 8;
92 buflen -= 8;
93  
94 break;
95  
96 default:
97 return -EINVAL;
98 }
99  
100 ret = -ENOENT;
101 while (buflen > 2) {
102 u16 id;
103 u16 len;
104  
105 len = get_u16(buf);
106 buf += 2;
107 buflen -= 2;
108  
109 if (buflen < 2)
110 break;
111  
112 id = get_u16(buf);
113 buf += 2;
114 buflen -= 2;
115  
116 if (id == RB_ID_TERMINATOR)
117 break;
118  
119 if (buflen < len)
120 break;
121  
122 if (id == tag_id) {
123 if (tag_len)
124 *tag_len = len;
125 if (tag_data)
126 *tag_data = buf;
127 ret = 0;
128 break;
129 }
130  
131 if (align)
132 len = (len + 3) / 4;
133  
134 buf += len;
135 buflen -= len;
136 }
137  
138 return ret;
139 }
140  
141 static inline int
142 rb_find_hard_cfg_tag(u16 tag_id, u8 **tag_data, u16 *tag_len)
143 {
144 if (!rb_info.hard_cfg_data ||
145 !rb_info.hard_cfg_size)
146 return -ENOENT;
147  
148 return routerboot_find_tag(rb_info.hard_cfg_data,
149 rb_info.hard_cfg_size,
150 tag_id, tag_data, tag_len);
151 }
152  
153 __init const char *
154 rb_get_board_name(void)
155 {
156 u16 tag_len;
157 u8 *tag;
158 int err;
159  
160 err = rb_find_hard_cfg_tag(RB_ID_BOARD_NAME, &tag, &tag_len);
161 if (err)
162 return NULL;
163  
164 return tag;
165 }
166  
167 __init u32
168 rb_get_hw_options(void)
169 {
170 u16 tag_len;
171 u8 *tag;
172 int err;
173  
174 err = rb_find_hard_cfg_tag(RB_ID_HW_OPTIONS, &tag, &tag_len);
175 if (err)
176 return 0;
177  
178 return get_u32(tag);
179 }
180  
181 static void * __init
182 __rb_get_wlan_data(u16 id)
183 {
184 u16 tag_len;
185 u8 *tag;
186 void *buf;
187 int err;
188 u32 magic;
189 size_t src_done;
190 size_t dst_done;
191  
192 err = rb_find_hard_cfg_tag(RB_ID_WLAN_DATA, &tag, &tag_len);
193 if (err) {
194 pr_err("no calibration data found\n");
195 goto err;
196 }
197  
198 buf = kmalloc(RB_ART_SIZE, GFP_KERNEL);
199 if (buf == NULL) {
200 pr_err("no memory for calibration data\n");
201 goto err;
202 }
203  
204 magic = get_u32(tag);
205 if (magic == RB_MAGIC_ERD) {
206 u8 *erd_data;
207 u16 erd_len;
208  
209 if (id == 0)
210 goto err_free;
211  
212 err = routerboot_find_tag(tag, tag_len, id,
213 &erd_data, &erd_len);
214 if (err) {
215 pr_err("no ERD data found for id %u\n", id);
216 goto err_free;
217 }
218  
219 dst_done = RB_ART_SIZE;
220 err = lzo1x_decompress_safe(erd_data, erd_len, buf, &dst_done);
221 if (err) {
222 pr_err("unable to decompress calibration data %d\n",
223 err);
224 goto err_free;
225 }
226 } else {
227 if (id != 0)
228 goto err_free;
229  
230 err = rle_decode((char *) tag, tag_len, buf, RB_ART_SIZE,
231 &src_done, &dst_done);
232 if (err) {
233 pr_err("unable to decode calibration data\n");
234 goto err_free;
235 }
236 }
237  
238 return buf;
239  
240 err_free:
241 kfree(buf);
242 err:
243 return NULL;
244 }
245  
246 __init void *
247 rb_get_wlan_data(void)
248 {
249 return __rb_get_wlan_data(0);
250 }
251  
252 __init void *
253 rb_get_ext_wlan_data(u16 id)
254 {
255 return __rb_get_wlan_data(id);
256 }
257  
258 __init const struct rb_info *
259 rb_init_info(void *data, unsigned int size)
260 {
261 unsigned int offset;
262  
263 if (size == 0 || (size % RB_BLOCK_SIZE) != 0)
264 return NULL;
265  
266 for (offset = 0; offset < size; offset += RB_BLOCK_SIZE) {
267 u32 magic;
268  
269 magic = get_u32(data + offset);
270 switch (magic) {
271 case RB_MAGIC_HARD:
272 rb_info.hard_cfg_offs = offset;
273 break;
274  
275 case RB_MAGIC_SOFT:
276 rb_info.soft_cfg_offs = offset;
277 break;
278 }
279 }
280  
281 if (!rb_info.hard_cfg_offs) {
282 pr_err("could not find a valid RouterBOOT hard config\n");
283 return NULL;
284 }
285  
286 if (!rb_info.soft_cfg_offs) {
287 pr_err("could not find a valid RouterBOOT soft config\n");
288 return NULL;
289 }
290  
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)
295 return NULL;
296  
297 rb_info.board_name = rb_get_board_name();
298 rb_info.hw_options = rb_get_hw_options();
299  
300 return &rb_info;
301 }
302  
303 static char *rb_ext_wlan_data;
304  
305 static ssize_t
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)
309 {
310 if (off + count > attr->size)
311 return -EFBIG;
312  
313 memcpy(buf, &rb_ext_wlan_data[off], count);
314  
315 return count;
316 }
317  
318 static const struct bin_attribute rb_ext_wlan_data_attr = {
319 .attr = {
320 .name = "ext_wlan_data",
321 .mode = S_IRUSR | S_IWUSR,
322 },
323 .read = rb_ext_wlan_data_read,
324 .size = RB_ART_SIZE,
325 };
326  
327 static int __init rb_sysfs_init(void)
328 {
329 struct kobject *rb_kobj;
330 int ret;
331  
332 rb_ext_wlan_data = rb_get_ext_wlan_data(1);
333 if (rb_ext_wlan_data == NULL)
334 return -ENOENT;
335  
336 rb_kobj = kobject_create_and_add("routerboot", firmware_kobj);
337 if (rb_kobj == NULL) {
338 ret = -ENOMEM;
339 pr_err("unable to create sysfs entry\n");
340 goto err_free_wlan_data;
341 }
342  
343 ret = sysfs_create_bin_file(rb_kobj, &rb_ext_wlan_data_attr);
344 if (ret) {
345 pr_err("unable to create sysfs file, %d\n", ret);
346 goto err_put_kobj;
347 }
348  
349 return 0;
350  
351 err_put_kobj:
352 kobject_put(rb_kobj);
353 err_free_wlan_data:
354 kfree(rb_ext_wlan_data);
355 return ret;
356 }
357  
358 late_initcall(rb_sysfs_init);