| Ivo van Doorn | 95ea362 | 2007-09-25 17:57:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | Copyright (C) 2004 - 2007 rt2x00 SourceForge Project |
| 3 | <http://rt2x00.serialmonkey.com> |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the |
| 17 | Free Software Foundation, Inc., |
| 18 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | Module: rt2x00lib |
| 23 | Abstract: rt2x00 firmware loading routines. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * Set enviroment defines for rt2x00.h |
| 28 | */ |
| 29 | #define DRV_NAME "rt2x00lib" |
| 30 | |
| 31 | #include <linux/crc-itu-t.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/module.h> |
| 34 | |
| 35 | #include "rt2x00.h" |
| 36 | #include "rt2x00lib.h" |
| 37 | |
| 38 | static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev) |
| 39 | { |
| 40 | struct device *device = wiphy_dev(rt2x00dev->hw->wiphy); |
| 41 | const struct firmware *fw; |
| 42 | char *fw_name; |
| 43 | int retval; |
| 44 | u16 crc; |
| 45 | u16 tmp; |
| 46 | |
| 47 | /* |
| 48 | * Read correct firmware from harddisk. |
| 49 | */ |
| 50 | fw_name = rt2x00dev->ops->lib->get_firmware_name(rt2x00dev); |
| 51 | if (!fw_name) { |
| 52 | ERROR(rt2x00dev, |
| 53 | "Invalid firmware filename.\n" |
| 54 | "Please file bug report to %s.\n", DRV_PROJECT); |
| 55 | return -EINVAL; |
| 56 | } |
| 57 | |
| 58 | INFO(rt2x00dev, "Loading firmware file '%s'.\n", fw_name); |
| 59 | |
| 60 | retval = request_firmware(&fw, fw_name, device); |
| 61 | if (retval) { |
| 62 | ERROR(rt2x00dev, "Failed to request Firmware.\n"); |
| 63 | return retval; |
| 64 | } |
| 65 | |
| 66 | if (!fw || !fw->size || !fw->data) { |
| 67 | ERROR(rt2x00dev, "Failed to read Firmware.\n"); |
| 68 | return -ENOENT; |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * Validate the firmware using 16 bit CRC. |
| 73 | * The last 2 bytes of the firmware are the CRC |
| 74 | * so substract those 2 bytes from the CRC checksum, |
| 75 | * and set those 2 bytes to 0 when calculating CRC. |
| 76 | */ |
| 77 | tmp = 0; |
| 78 | crc = crc_itu_t(0, fw->data, fw->size - 2); |
| 79 | crc = crc_itu_t(crc, (u8 *)&tmp, 2); |
| 80 | |
| 81 | if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) { |
| 82 | ERROR(rt2x00dev, "Firmware CRC error.\n"); |
| 83 | retval = -ENOENT; |
| 84 | goto exit; |
| 85 | } |
| 86 | |
| 87 | INFO(rt2x00dev, "Firmware detected - version: %d.%d.\n", |
| 88 | fw->data[fw->size - 4], fw->data[fw->size - 3]); |
| 89 | |
| 90 | rt2x00dev->fw = fw; |
| 91 | |
| 92 | return 0; |
| 93 | |
| 94 | exit: |
| 95 | release_firmware(fw); |
| 96 | |
| 97 | return retval; |
| 98 | } |
| 99 | |
| 100 | int rt2x00lib_load_firmware(struct rt2x00_dev *rt2x00dev) |
| 101 | { |
| 102 | int retval; |
| 103 | |
| 104 | if (!rt2x00dev->fw) { |
| 105 | retval = rt2x00lib_request_firmware(rt2x00dev); |
| 106 | if (retval) |
| 107 | return retval; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Send firmware to the device. |
| 112 | */ |
| 113 | retval = rt2x00dev->ops->lib->load_firmware(rt2x00dev, |
| 114 | rt2x00dev->fw->data, |
| 115 | rt2x00dev->fw->size); |
| 116 | return retval; |
| 117 | } |
| 118 | |
| 119 | void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev) |
| 120 | { |
| 121 | release_firmware(rt2x00dev->fw); |
| 122 | rt2x00dev->fw = NULL; |
| 123 | } |
| 124 | |