diff options
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00firmware.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00firmware.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00firmware.c b/drivers/net/wireless/rt2x00/rt2x00firmware.c new file mode 100644 index 0000000..236025f --- /dev/null +++ b/drivers/net/wireless/rt2x00/rt2x00firmware.c @@ -0,0 +1,124 @@ +/* + 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. + */ + +/* + * Set enviroment defines for rt2x00.h + */ +#define DRV_NAME "rt2x00lib" + +#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; +} + |