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358 lines
6.2 KiB
358 lines
6.2 KiB
/*
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* RouterBoot helper routines
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*
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* Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) "rb: " fmt
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#include <linux/kernel.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/routerboot.h>
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#include <linux/rle.h>
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#include <linux/lzo.h>
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#include "routerboot.h"
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#define RB_BLOCK_SIZE 0x1000
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#define RB_ART_SIZE 0x10000
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#define RB_MAGIC_ERD 0x00455244 /* extended radio data */
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static struct rb_info rb_info;
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static u32 get_u32(void *buf)
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{
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u8 *p = buf;
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return ((u32) p[3] + ((u32) p[2] << 8) + ((u32) p[1] << 16) +
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((u32) p[0] << 24));
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}
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static u16 get_u16(void *buf)
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{
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u8 *p = buf;
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return (u16) p[1] + ((u16) p[0] << 8);
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}
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__init int
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routerboot_find_magic(u8 *buf, unsigned int buflen, u32 *offset, bool hard)
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{
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u32 magic_ref = hard ? RB_MAGIC_HARD : RB_MAGIC_SOFT;
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u32 magic;
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u32 cur = *offset;
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while (cur < buflen) {
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magic = get_u32(buf + cur);
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if (magic == magic_ref) {
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*offset = cur;
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return 0;
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}
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cur += 0x1000;
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}
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return -ENOENT;
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}
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__init int
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routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
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u8 **tag_data, u16 *tag_len)
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{
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uint32_t magic;
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bool align = false;
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int ret;
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if (buflen < 4)
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return -EINVAL;
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magic = get_u32(buf);
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switch (magic) {
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case RB_MAGIC_ERD:
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align = true;
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/* fall trough */
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case RB_MAGIC_HARD:
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/* skip magic value */
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buf += 4;
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buflen -= 4;
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break;
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case RB_MAGIC_SOFT:
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if (buflen < 8)
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return -EINVAL;
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/* skip magic and CRC value */
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buf += 8;
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buflen -= 8;
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break;
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default:
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return -EINVAL;
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}
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ret = -ENOENT;
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while (buflen > 2) {
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u16 id;
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u16 len;
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len = get_u16(buf);
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buf += 2;
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buflen -= 2;
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if (buflen < 2)
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break;
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id = get_u16(buf);
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buf += 2;
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buflen -= 2;
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if (id == RB_ID_TERMINATOR)
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break;
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if (buflen < len)
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break;
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if (id == tag_id) {
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if (tag_len)
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*tag_len = len;
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if (tag_data)
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*tag_data = buf;
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ret = 0;
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break;
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}
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if (align)
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len = (len + 3) / 4;
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buf += len;
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buflen -= len;
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}
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return ret;
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}
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static inline int
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rb_find_hard_cfg_tag(u16 tag_id, u8 **tag_data, u16 *tag_len)
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{
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if (!rb_info.hard_cfg_data ||
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!rb_info.hard_cfg_size)
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return -ENOENT;
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return routerboot_find_tag(rb_info.hard_cfg_data,
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rb_info.hard_cfg_size,
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tag_id, tag_data, tag_len);
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}
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__init const char *
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rb_get_board_name(void)
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{
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u16 tag_len;
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u8 *tag;
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int err;
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err = rb_find_hard_cfg_tag(RB_ID_BOARD_NAME, &tag, &tag_len);
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if (err)
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return NULL;
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return tag;
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}
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__init u32
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rb_get_hw_options(void)
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{
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u16 tag_len;
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u8 *tag;
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int err;
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err = rb_find_hard_cfg_tag(RB_ID_HW_OPTIONS, &tag, &tag_len);
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if (err)
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return 0;
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return get_u32(tag);
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}
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static void * __init
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__rb_get_wlan_data(u16 id)
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{
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u16 tag_len;
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u8 *tag;
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void *buf;
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int err;
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u32 magic;
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size_t src_done;
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size_t dst_done;
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err = rb_find_hard_cfg_tag(RB_ID_WLAN_DATA, &tag, &tag_len);
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if (err) {
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pr_err("no calibration data found\n");
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goto err;
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}
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buf = kmalloc(RB_ART_SIZE, GFP_KERNEL);
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if (buf == NULL) {
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pr_err("no memory for calibration data\n");
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goto err;
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}
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magic = get_u32(tag);
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if (magic == RB_MAGIC_ERD) {
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u8 *erd_data;
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u16 erd_len;
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if (id == 0)
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goto err_free;
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err = routerboot_find_tag(tag, tag_len, id,
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&erd_data, &erd_len);
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if (err) {
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pr_err("no ERD data found for id %u\n", id);
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goto err_free;
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}
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dst_done = RB_ART_SIZE;
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err = lzo1x_decompress_safe(erd_data, erd_len, buf, &dst_done);
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if (err) {
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pr_err("unable to decompress calibration data %d\n",
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err);
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goto err_free;
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}
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} else {
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if (id != 0)
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goto err_free;
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err = rle_decode((char *) tag, tag_len, buf, RB_ART_SIZE,
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&src_done, &dst_done);
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if (err) {
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pr_err("unable to decode calibration data\n");
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goto err_free;
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}
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}
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return buf;
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err_free:
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kfree(buf);
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err:
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return NULL;
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}
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__init void *
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rb_get_wlan_data(void)
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{
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return __rb_get_wlan_data(0);
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}
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__init void *
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rb_get_ext_wlan_data(u16 id)
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{
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return __rb_get_wlan_data(id);
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}
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__init const struct rb_info *
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rb_init_info(void *data, unsigned int size)
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{
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unsigned int offset;
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if (size == 0 || (size % RB_BLOCK_SIZE) != 0)
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return NULL;
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for (offset = 0; offset < size; offset += RB_BLOCK_SIZE) {
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u32 magic;
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magic = get_u32(data + offset);
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switch (magic) {
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case RB_MAGIC_HARD:
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rb_info.hard_cfg_offs = offset;
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break;
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case RB_MAGIC_SOFT:
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rb_info.soft_cfg_offs = offset;
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break;
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}
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}
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if (!rb_info.hard_cfg_offs) {
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pr_err("could not find a valid RouterBOOT hard config\n");
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return NULL;
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}
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if (!rb_info.soft_cfg_offs) {
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pr_err("could not find a valid RouterBOOT soft config\n");
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return NULL;
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}
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rb_info.hard_cfg_size = RB_BLOCK_SIZE;
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rb_info.hard_cfg_data = kmemdup(data + rb_info.hard_cfg_offs,
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RB_BLOCK_SIZE, GFP_KERNEL);
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if (!rb_info.hard_cfg_data)
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return NULL;
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rb_info.board_name = rb_get_board_name();
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rb_info.hw_options = rb_get_hw_options();
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return &rb_info;
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}
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static char *rb_ext_wlan_data;
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static ssize_t
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rb_ext_wlan_data_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr, char *buf,
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loff_t off, size_t count)
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{
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if (off + count > attr->size)
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return -EFBIG;
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memcpy(buf, &rb_ext_wlan_data[off], count);
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return count;
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}
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static const struct bin_attribute rb_ext_wlan_data_attr = {
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.attr = {
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.name = "ext_wlan_data",
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.mode = S_IRUSR | S_IWUSR,
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},
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.read = rb_ext_wlan_data_read,
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.size = RB_ART_SIZE,
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};
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static int __init rb_sysfs_init(void)
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{
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struct kobject *rb_kobj;
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int ret;
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rb_ext_wlan_data = rb_get_ext_wlan_data(1);
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if (rb_ext_wlan_data == NULL)
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return -ENOENT;
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rb_kobj = kobject_create_and_add("routerboot", firmware_kobj);
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if (rb_kobj == NULL) {
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ret = -ENOMEM;
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pr_err("unable to create sysfs entry\n");
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goto err_free_wlan_data;
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}
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ret = sysfs_create_bin_file(rb_kobj, &rb_ext_wlan_data_attr);
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if (ret) {
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pr_err("unable to create sysfs file, %d\n", ret);
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goto err_put_kobj;
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}
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return 0;
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err_put_kobj:
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kobject_put(rb_kobj);
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err_free_wlan_data:
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kfree(rb_ext_wlan_data);
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return ret;
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}
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late_initcall(rb_sysfs_init);
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