drivers/net/wireless/rt2x00/rt2x00firmware.c

   1 /*
   2         Copyright (C) 2004 - 2008 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 routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
  33 {
  34         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
  35         const struct firmware *fw;
  36         char *fw_name;
  37         int retval;
  38         u16 crc;
  39
  40         /*
  41          * Read correct firmware from harddisk.
  42          */
  43         fw_name = rt2x00dev->ops->lib->get_firmware_name(rt2x00dev);
  44         if (!fw_name) {
  45                 ERROR(rt2x00dev,
  46                       "Invalid firmware filename.\n"
  47                       "Please file bug report to %s.\n", DRV_PROJECT);
  48                 return -EINVAL;
  49         }
  50
  51         INFO(rt2x00dev, "Loading firmware file '%s'.\n", fw_name);
  52
  53         retval = request_firmware(&fw, fw_name, device);
  54         if (retval) {
  55                 ERROR(rt2x00dev, "Failed to request Firmware.\n");
  56                 return retval;
  57         }
  58
  59         if (!fw || !fw->size || !fw->data) {
  60                 ERROR(rt2x00dev, "Failed to read Firmware.\n");
  61                 return -ENOENT;
  62         }
  63
  64         crc = rt2x00dev->ops->lib->get_firmware_crc(fw->data, fw->size);
  65         if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
  66                 ERROR(rt2x00dev, "Firmware checksum error.\n");
  67                 retval = -ENOENT;
  68                 goto exit;
  69         }
  70
  71         INFO(rt2x00dev, "Firmware detected - version: %d.%d.\n",
  72              fw->data[fw->size - 4], fw->data[fw->size - 3]);
  73
  74         rt2x00dev->fw = fw;
  75
  76         return 0;
  77
  78 exit:
  79         release_firmware(fw);
  80
  81         return retval;
  82 }
  83
  84 int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev)
  85 {
  86         int retval;
  87
  88         if (!test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags))
  89                 return 0;
  90
  91         if (!rt2x00dev->fw) {
  92                 retval = rt2x00lib_request_firmware(rt2x00dev);
  93                 if (retval)
  94                         return retval;
  95         }
  96
  97         /*
  98          * Send firmware to the device.
  99          */
 100         retval = rt2x00dev->ops->lib->load_firmware(rt2x00dev,
 101                                                     rt2x00dev->fw->data,
 102                                                     rt2x00dev->fw->size);
 103         return retval;
 104 }
 105
 106 void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
 107 {
 108         release_firmware(rt2x00dev->fw);
 109         rt2x00dev->fw = NULL;
 110 }