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