* by the Free Software Foundation.
*/
+#define pr_fmt(fmt) "rb: " fmt
+
#include <linux/kernel.h>
+#include <linux/kobject.h>
+#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/routerboot.h>
+#include <linux/rle.h>
+#include <linux/lzo.h>
#include "routerboot.h"
+#define RB_BLOCK_SIZE 0x1000
+#define RB_ART_SIZE 0x10000
+#define RB_MAGIC_ERD 0x00455244 /* extended radio data */
+
+static struct rb_info rb_info;
+
static u32 get_u32(void *buf)
{
u8 *p = buf;
}
__init int
+routerboot_find_magic(u8 *buf, unsigned int buflen, u32 *offset, bool hard)
+{
+ u32 magic_ref = hard ? RB_MAGIC_HARD : RB_MAGIC_SOFT;
+ u32 magic;
+ u32 cur = *offset;
+
+ while (cur < buflen) {
+ magic = get_u32(buf + cur);
+ if (magic == magic_ref) {
+ *offset = cur;
+ return 0;
+ }
+
+ cur += 0x1000;
+ }
+
+ return -ENOENT;
+}
+
+__init int
routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
u8 **tag_data, u16 *tag_len)
{
uint32_t magic;
+ bool align = false;
int ret;
if (buflen < 4)
magic = get_u32(buf);
switch (magic) {
+ case RB_MAGIC_ERD:
+ align = true;
+ /* fall trough */
case RB_MAGIC_HARD:
/* skip magic value */
buf += 4;
break;
}
+ if (align)
+ len = (len + 3) / 4;
+
buf += len;
buflen -= len;
}
return ret;
}
+
+static inline int
+rb_find_hard_cfg_tag(u16 tag_id, u8 **tag_data, u16 *tag_len)
+{
+ if (!rb_info.hard_cfg_data ||
+ !rb_info.hard_cfg_size)
+ return -ENOENT;
+
+ return routerboot_find_tag(rb_info.hard_cfg_data,
+ rb_info.hard_cfg_size,
+ tag_id, tag_data, tag_len);
+}
+
+__init const char *
+rb_get_board_name(void)
+{
+ u16 tag_len;
+ u8 *tag;
+ int err;
+
+ err = rb_find_hard_cfg_tag(RB_ID_BOARD_NAME, &tag, &tag_len);
+ if (err)
+ return NULL;
+
+ return tag;
+}
+
+__init u32
+rb_get_hw_options(void)
+{
+ u16 tag_len;
+ u8 *tag;
+ int err;
+
+ err = rb_find_hard_cfg_tag(RB_ID_HW_OPTIONS, &tag, &tag_len);
+ if (err)
+ return 0;
+
+ return get_u32(tag);
+}
+
+static void * __init
+__rb_get_wlan_data(u16 id)
+{
+ u16 tag_len;
+ u8 *tag;
+ void *buf;
+ int err;
+ u32 magic;
+ size_t src_done;
+ size_t dst_done;
+
+ err = rb_find_hard_cfg_tag(RB_ID_WLAN_DATA, &tag, &tag_len);
+ if (err) {
+ pr_err("no calibration data found\n");
+ goto err;
+ }
+
+ buf = kmalloc(RB_ART_SIZE, GFP_KERNEL);
+ if (buf == NULL) {
+ pr_err("no memory for calibration data\n");
+ goto err;
+ }
+
+ magic = get_u32(tag);
+ if (magic == RB_MAGIC_ERD) {
+ u8 *erd_data;
+ u16 erd_len;
+
+ if (id == 0)
+ goto err_free;
+
+ err = routerboot_find_tag(tag, tag_len, id,
+ &erd_data, &erd_len);
+ if (err) {
+ pr_err("no ERD data found for id %u\n", id);
+ goto err_free;
+ }
+
+ dst_done = RB_ART_SIZE;
+ err = lzo1x_decompress_safe(erd_data, erd_len, buf, &dst_done);
+ if (err) {
+ pr_err("unable to decompress calibration data %d\n",
+ err);
+ goto err_free;
+ }
+ } else {
+ if (id != 0)
+ goto err_free;
+
+ err = rle_decode((char *) tag, tag_len, buf, RB_ART_SIZE,
+ &src_done, &dst_done);
+ if (err) {
+ pr_err("unable to decode calibration data\n");
+ goto err_free;
+ }
+ }
+
+ return buf;
+
+err_free:
+ kfree(buf);
+err:
+ return NULL;
+}
+
+__init void *
+rb_get_wlan_data(void)
+{
+ return __rb_get_wlan_data(0);
+}
+
+__init void *
+rb_get_ext_wlan_data(u16 id)
+{
+ return __rb_get_wlan_data(id);
+}
+
+__init const struct rb_info *
+rb_init_info(void *data, unsigned int size)
+{
+ unsigned int offset;
+
+ if (size == 0 || (size % RB_BLOCK_SIZE) != 0)
+ return NULL;
+
+ for (offset = 0; offset < size; offset += RB_BLOCK_SIZE) {
+ u32 magic;
+
+ magic = get_u32(data + offset);
+ switch (magic) {
+ case RB_MAGIC_HARD:
+ rb_info.hard_cfg_offs = offset;
+ break;
+
+ case RB_MAGIC_SOFT:
+ rb_info.soft_cfg_offs = offset;
+ break;
+ }
+ }
+
+ if (!rb_info.hard_cfg_offs) {
+ pr_err("could not find a valid RouterBOOT hard config\n");
+ return NULL;
+ }
+
+ if (!rb_info.soft_cfg_offs) {
+ pr_err("could not find a valid RouterBOOT soft config\n");
+ return NULL;
+ }
+
+ rb_info.hard_cfg_size = RB_BLOCK_SIZE;
+ rb_info.hard_cfg_data = kmemdup(data + rb_info.hard_cfg_offs,
+ RB_BLOCK_SIZE, GFP_KERNEL);
+ if (!rb_info.hard_cfg_data)
+ return NULL;
+
+ rb_info.board_name = rb_get_board_name();
+ rb_info.hw_options = rb_get_hw_options();
+
+ return &rb_info;
+}
+
+static char *rb_ext_wlan_data;
+
+static ssize_t
+rb_ext_wlan_data_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr, char *buf,
+ loff_t off, size_t count)
+{
+ if (off + count > attr->size)
+ return -EFBIG;
+
+ memcpy(buf, &rb_ext_wlan_data[off], count);
+
+ return count;
+}
+
+static const struct bin_attribute rb_ext_wlan_data_attr = {
+ .attr = {
+ .name = "ext_wlan_data",
+ .mode = S_IRUSR | S_IWUSR,
+ },
+ .read = rb_ext_wlan_data_read,
+ .size = RB_ART_SIZE,
+};
+
+static int __init rb_sysfs_init(void)
+{
+ struct kobject *rb_kobj;
+ int ret;
+
+ rb_ext_wlan_data = rb_get_ext_wlan_data(1);
+ if (rb_ext_wlan_data == NULL)
+ return -ENOENT;
+
+ rb_kobj = kobject_create_and_add("routerboot", firmware_kobj);
+ if (rb_kobj == NULL) {
+ ret = -ENOMEM;
+ pr_err("unable to create sysfs entry\n");
+ goto err_free_wlan_data;
+ }
+
+ ret = sysfs_create_bin_file(rb_kobj, &rb_ext_wlan_data_attr);
+ if (ret) {
+ pr_err("unable to create sysfs file, %d\n", ret);
+ goto err_put_kobj;
+ }
+
+ return 0;
+
+err_put_kobj:
+ kobject_put(rb_kobj);
+err_free_wlan_data:
+ kfree(rb_ext_wlan_data);
+ return ret;
+}
+
+late_initcall(rb_sysfs_init);
projects / openwrt.git / blobdiff