[RT2x00]: add driver for Ralink wireless hardware

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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 000000000000..236025f8b90f
--- /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;
+}
+