| /* |
| Copyright (C) 2004 - 2008 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-ccitt.h> |
| #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; |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * Perform crc validation on the firmware. |
| * The last 2 bytes in the firmware array are the crc checksum itself, |
| * this means that we should never pass those 2 bytes to the crc |
| * algorithm. |
| */ |
| if (test_bit(DRIVER_REQUIRE_FIRMWARE_CRC_ITU_T, &rt2x00dev->flags)) { |
| /* |
| * Use the crc itu-t algorithm. |
| * Use 0 for the last 2 bytes to complete the checksum. |
| */ |
| crc = crc_itu_t(0, fw->data, fw->size - 2); |
| crc = crc_itu_t_byte(crc, 0); |
| crc = crc_itu_t_byte(crc, 0); |
| } else if (test_bit(DRIVER_REQUIRE_FIRMWARE_CCITT, &rt2x00dev->flags)) { |
| /* |
| * Use the crc ccitt algorithm. |
| * This will return the same value as the legacy driver which |
| * used bit ordering reversion on the both the firmware bytes |
| * before input input as well as on the final output. |
| * Obviously using crc ccitt directly is much more efficient. |
| */ |
| crc = crc_ccitt(~0, fw->data, fw->size - 2); |
| } else { |
| ERROR(rt2x00dev, "No checksum algorithm selected " |
| "for firmware validation.\n"); |
| retval = -ENOENT; |
| goto exit; |
| } |
| |
| if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) { |
| ERROR(rt2x00dev, "Firmware checksum 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 (!test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) |
| return 0; |
| |
| 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; |
| } |
| |