LXR linux/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
  31static 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
  89exit:
  90        release_firmware(fw);
  91
  92        return -ENOENT;
  93}
  94
  95int 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
 125void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
 126{
 127        release_firmware(rt2x00dev->fw);
 128        rt2x00dev->fw = NULL;
 129}
 130