drivers/net/wireless/rt2x00/rt2x00firmware.c

   1 /*
   2         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   3         Copyright (C) 2004 - 2009 Gertjan van Wingerde <gwingerde@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6         This program is free software; you can redistribute it and/or modify
   7         it under the terms of the GNU General Public License as published by
   8         the Free Software Foundation; either version 2 of the License, or
   9         (at your option) any later version.
  10
  11         This program is distributed in the hope that it will be useful,
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14         GNU General Public License for more details.
  15
  16         You should have received a copy of the GNU General Public License
  17         along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21         Module: rt2x00lib
  22         Abstract: rt2x00 firmware loading routines.
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27
  28 #include "rt2x00.h"
  29 #include "rt2x00lib.h"
  30
  31 static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
  32 {
  33         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
  34         const struct firmware *fw;
  35         char *fw_name;
  36         int retval;
  37
  38         /*
  39          * Read correct firmware from harddisk.
  40          */
  41         fw_name = rt2x00dev->ops->lib->get_firmware_name(rt2x00dev);
  42         if (!fw_name) {
  43                 rt2x00_err(rt2x00dev,
  44                            "Invalid firmware filename\n"
  45                            "Please file bug report to %s\n", DRV_PROJECT);
  46                 return -EINVAL;
  47         }
  48
  49         rt2x00_info(rt2x00dev, "Loading firmware file '%s'\n", fw_name);
  50
  51         retval = request_firmware(&fw, fw_name, device);
  52         if (retval) {
  53                 rt2x00_err(rt2x00dev, "Failed to request Firmware\n");
  54                 return retval;
  55         }
  56
  57         if (!fw || !fw->size || !fw->data) {
  58                 rt2x00_err(rt2x00dev, "Failed to read Firmware\n");
  59                 release_firmware(fw);
  60                 return -ENOENT;
  61         }
  62
  63         rt2x00_info(rt2x00dev, "Firmware detected - version: %d.%d\n",
  64                     fw->data[fw->size - 4], fw->data[fw->size - 3]);
  65         snprintf(rt2x00dev->hw->wiphy->fw_version,
  66                         sizeof(rt2x00dev->hw->wiphy->fw_version), "%d.%d",
  67                         fw->data[fw->size - 4], fw->data[fw->size - 3]);
  68
  69         retval = rt2x00dev->ops->lib->check_firmware(rt2x00dev, fw->data, fw->size);
  70         switch (retval) {
  71         case FW_OK:
  72                 break;
  73         case FW_BAD_CRC:
  74                 rt2x00_err(rt2x00dev, "Firmware checksum error\n");
  75                 goto exit;
  76         case FW_BAD_LENGTH:
  77                 rt2x00_err(rt2x00dev, "Invalid firmware file length (len=%zu)\n",
  78                            fw->size);
  79                 goto exit;
  80         case FW_BAD_VERSION:
  81                 rt2x00_err(rt2x00dev, "Current firmware does not support detected chipset\n");
  82                 goto exit;
  83         }
  84
  85         rt2x00dev->fw = fw;
  86
  87         return 0;
  88
  89 exit:
  90         release_firmware(fw);
  91
  92         return -ENOENT;
  93 }
  94
  95 int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev)
  96 {
  97         int retval;
  98
  99         if (!test_bit(REQUIRE_FIRMWARE, &rt2x00dev->cap_flags))
 100                 return 0;
 101
 102         if (!rt2x00dev->fw) {
 103                 retval = rt2x00lib_request_firmware(rt2x00dev);
 104                 if (retval)
 105                         return retval;
 106         }
 107
 108         /*
 109          * Send firmware to the device.
 110          */
 111         retval = rt2x00dev->ops->lib->load_firmware(rt2x00dev,
 112                                                     rt2x00dev->fw->data,
 113                                                     rt2x00dev->fw->size);
 114
 115         /*
 116          * When the firmware is uploaded to the hardware the LED
 117          * association status might have been triggered, for correct
 118          * LED handling it should now be reset.
 119          */
 120         rt2x00leds_led_assoc(rt2x00dev, false);
 121
 122         return retval;
 123 }
 124
 125 void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
 126 {
 127         release_firmware(rt2x00dev->fw);
 128         rt2x00dev->fw = NULL;
 129 }