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/crc-itu-t.h>
  33 #include <linux/firmware.h>
  34
  35 #include "rt2x00.h"
  36 #include "rt2x00firmware.h"
  37
  38 static void rt2x00lib_load_firmware_continued(const struct firmware *fw,
  39         void *context)
  40 {
  41         struct rt2x00_dev *rt2x00dev = context;
  42         u16 crc;
  43         u16 tmp;
  44
  45         if (!fw || !fw->size || !fw->data) {
  46                 ERROR(rt2x00dev, "Failed to read Firmware.\n");
  47                 goto exit_failed;
  48         }
  49
  50         /*
  51          * Validate the firmware using 16 bit CRC.
  52          * The last 2 bytes of the firmware are the CRC
  53          * so substract those 2 bytes from the CRC checksum,
  54          * and set those 2 bytes to 0 when calculating CRC.
  55          */
  56         tmp = 0;
  57         crc = crc_itu_t(0, fw->data, fw->size - 2);
  58         crc = crc_itu_t(crc, (u8*)&tmp, 2);
  59
  60         if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
  61                 ERROR(rt2x00dev, "Firmware CRC error.\n");
  62                 goto exit_failed;
  63         }
  64
  65         /*
  66          * Send firmware to the device.
  67          */
  68         if (rt2x00dev->ops->lib->load_firmware(rt2x00dev, fw->data, fw->size))
  69                 goto exit_failed;
  70
  71         INFO(rt2x00dev, "Firmware detected - version: %d.%d.\n",
  72                 fw->data[fw->size - 4], fw->data[fw->size - 3]);
  73
  74         __set_bit(FIRMWARE_LOADED, &rt2x00dev->flags);
  75
  76         return;
  77
  78 exit_failed:
  79         rt2x00debug_deregister(rt2x00dev);
  80
  81         __set_bit(FIRMWARE_FAILED, &rt2x00dev->flags);
  82 }
  83
  84 int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev)
  85 {
  86         char *fw_name;
  87         int status = -EINVAL;
  88
  89         /*
  90          * Read correct firmware from harddisk.
  91          */
  92         fw_name = rt2x00dev->ops->lib->get_fw_name(rt2x00dev);
  93         BUG_ON(fw_name == NULL);
  94
  95         INFO(rt2x00dev, "Loading firmware file '%s'.\n", fw_name);
  96
  97         status = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
  98                 fw_name, rt2x00dev->device, rt2x00dev,
  99                 &rt2x00lib_load_firmware_continued);
 100
 101         if (status)
 102                 ERROR(rt2x00dev, "Failed to request Firmware.\n");
 103
 104         return status;
 105 }
 106
 107 int rt2x00lib_load_firmware_wait(struct rt2x00_dev *rt2x00dev)
 108 {
 109         unsigned int i;
 110
 111         if (!test_bit(FIRMWARE_REQUIRED, &rt2x00dev->flags))
 112                 return 0;
 113
 114         for (i = 0; i < 150; i++) {
 115                 if (test_bit(FIRMWARE_FAILED, &rt2x00dev->flags))
 116                         return -EIO;
 117                 if (test_bit(FIRMWARE_LOADED, &rt2x00dev->flags))
 118                         return 0;
 119                 msleep(20);
 120         }
 121
 122         ERROR(rt2x00dev, "Firmware loading timed out.\n");
 123         return -ETIMEDOUT;
 124 }