package/rt2x00/src/rt2x00firmware.c

   1 /*
   2         Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 firmware loading specific routines.
  24         Supported chipsets: rt2561, rt2561s, rt2661, rt2571W & rt2671.
  25  */
  26
  27 /*
  28  * Set enviroment defines for rt2x00.h
  29  */
  30 #define DRV_NAME "rt2x00lib"
  31
  32 #include <linux/delay.h>
  33 #include <linux/crc-itu-t.h>
  34 #include <linux/firmware.h>
  35
  36 #include "rt2x00.h"
  37 #include "rt2x00lib.h"
  38 #include "rt2x00firmware.h"
  39
  40 static void rt2x00lib_load_firmware_continued(const struct firmware *fw,
  41         void *context)
  42 {
  43         struct rt2x00_dev *rt2x00dev = context;
  44         u16 crc;
  45         u16 tmp;
  46
  47         if (!fw || !fw->size || !fw->data) {
  48                 ERROR(rt2x00dev, "Failed to read Firmware.\n");
  49                 goto exit_failed;
  50         }
  51
  52         /*
  53          * Validate the firmware using 16 bit CRC.
  54          * The last 2 bytes of the firmware are the CRC
  55          * so substract those 2 bytes from the CRC checksum,
  56          * and set those 2 bytes to 0 when calculating CRC.
  57          */
  58         tmp = 0;
  59         crc = crc_itu_t(0, fw->data, fw->size - 2);
  60         crc = crc_itu_t(crc, (u8*)&tmp, 2);
  61
  62         if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
  63                 ERROR(rt2x00dev, "Firmware CRC error.\n");
  64                 goto exit_failed;
  65         }
  66
  67         /*
  68          * Send firmware to the device.
  69          */
  70         if (rt2x00dev->ops->lib->load_firmware(rt2x00dev, fw->data, fw->size))
  71                 goto exit_failed;
  72
  73         INFO(rt2x00dev, "Firmware detected - version: %d.%d.\n",
  74                 fw->data[fw->size - 4], fw->data[fw->size - 3]);
  75
  76         __set_bit(FIRMWARE_LOADED, &rt2x00dev->flags);
  77
  78         return;
  79
  80 exit_failed:
  81         rt2x00debug_deregister(rt2x00dev);
  82
  83         __set_bit(FIRMWARE_FAILED, &rt2x00dev->flags);
  84 }
  85
  86 int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev)
  87 {
  88         char *fw_name;
  89         int status = -EINVAL;
  90
  91         /*
  92          * Read correct firmware from harddisk.
  93          */
  94         fw_name = rt2x00dev->ops->lib->get_fw_name(rt2x00dev);
  95         if (!fw_name) {
  96                 ERROR(rt2x00dev,
  97                         "Invalid firmware filename.\n"
  98                         "Please file bug report to %s.\n", DRV_PROJECT);
  99                 return -EINVAL;
 100         }
 101
 102         INFO(rt2x00dev, "Loading firmware file '%s'.\n", fw_name);
 103
 104         status = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
 105                 fw_name, wiphy_dev(rt2x00dev->hw->wiphy), rt2x00dev,
 106                 &rt2x00lib_load_firmware_continued);
 107
 108         if (status)
 109                 ERROR(rt2x00dev, "Failed to request Firmware.\n");
 110
 111         return status;
 112 }
 113
 114 int rt2x00lib_load_firmware_wait(struct rt2x00_dev *rt2x00dev)
 115 {
 116         unsigned int i;
 117
 118         if (!test_bit(FIRMWARE_REQUIRED, &rt2x00dev->flags))
 119                 return 0;
 120
 121         for (i = 0; i < 150; i++) {
 122                 if (test_bit(FIRMWARE_FAILED, &rt2x00dev->flags))
 123                         return -EIO;
 124                 if (test_bit(FIRMWARE_LOADED, &rt2x00dev->flags))
 125                         return 0;
 126                 msleep(20);
 127         }
 128
 129         ERROR(rt2x00dev, "Firmware loading timed out.\n");
 130         return -ETIMEDOUT;
 131 }