mirror of https://gitee.com/openkylin/linux.git
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
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/*
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Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: rt2x00lib
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Abstract: rt2x00 firmware loading routines.
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*/
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#include <linux/crc-itu-t.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "rt2x00.h"
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#include "rt2x00lib.h"
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static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
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{
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struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
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const struct firmware *fw;
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char *fw_name;
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int retval;
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u16 crc;
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u16 tmp;
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/*
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* Read correct firmware from harddisk.
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*/
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fw_name = rt2x00dev->ops->lib->get_firmware_name(rt2x00dev);
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if (!fw_name) {
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ERROR(rt2x00dev,
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"Invalid firmware filename.\n"
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"Please file bug report to %s.\n", DRV_PROJECT);
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return -EINVAL;
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}
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INFO(rt2x00dev, "Loading firmware file '%s'.\n", fw_name);
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retval = request_firmware(&fw, fw_name, device);
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if (retval) {
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ERROR(rt2x00dev, "Failed to request Firmware.\n");
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return retval;
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}
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if (!fw || !fw->size || !fw->data) {
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ERROR(rt2x00dev, "Failed to read Firmware.\n");
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return -ENOENT;
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}
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/*
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* Validate the firmware using 16 bit CRC.
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* The last 2 bytes of the firmware are the CRC
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* so substract those 2 bytes from the CRC checksum,
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* and set those 2 bytes to 0 when calculating CRC.
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*/
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tmp = 0;
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crc = crc_itu_t(0, fw->data, fw->size - 2);
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crc = crc_itu_t(crc, (u8 *)&tmp, 2);
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if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
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ERROR(rt2x00dev, "Firmware CRC error.\n");
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retval = -ENOENT;
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goto exit;
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}
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INFO(rt2x00dev, "Firmware detected - version: %d.%d.\n",
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fw->data[fw->size - 4], fw->data[fw->size - 3]);
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rt2x00dev->fw = fw;
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return 0;
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exit:
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release_firmware(fw);
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return retval;
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}
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int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev)
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{
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int retval;
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if (!rt2x00dev->fw) {
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retval = rt2x00lib_request_firmware(rt2x00dev);
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if (retval)
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return retval;
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}
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/*
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* Send firmware to the device.
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*/
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retval = rt2x00dev->ops->lib->load_firmware(rt2x00dev,
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rt2x00dev->fw->data,
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rt2x00dev->fw->size);
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return retval;
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}
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void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
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{
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release_firmware(rt2x00dev->fw);
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rt2x00dev->fw = NULL;
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}
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