path: root/drivers/net/wireless/mwifiex/main.c

/*
 * Marvell Wireless LAN device driver: major functions
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "main.h"
#include "wmm.h"
#include "cfg80211.h"
#include "11n.h"

#define VERSION	"1.0"

const char driver_version[] = "mwifiex " VERSION " (%s) ";
static char *cal_data_cfg;
module_param(cal_data_cfg, charp, 0);

static void scan_delay_timer_fn(unsigned long data)
{
	struct mwifiex_private *priv = (struct mwifiex_private *)data;
	struct mwifiex_adapter *adapter = priv->adapter;
	struct cmd_ctrl_node *cmd_node, *tmp_node;
	unsigned long flags;

	if (adapter->surprise_removed)
		return;

	if (adapter->scan_delay_cnt == MWIFIEX_MAX_SCAN_DELAY_CNT) {
		/*
		 * Abort scan operation by cancelling all pending scan
		 * commands
		 */
		spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
		list_for_each_entry_safe(cmd_node, tmp_node,
					 &adapter->scan_pending_q, list) {
			list_del(&cmd_node->list);
			mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
		}
		spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);

		spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
		adapter->scan_processing = false;
		adapter->scan_delay_cnt = 0;
		adapter->empty_tx_q_cnt = 0;
		spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

		if (priv->scan_request) {
			dev_dbg(adapter->dev, "info: aborting scan\n");
			cfg80211_scan_done(priv->scan_request, 1);
			priv->scan_request = NULL;
		} else {
			priv->scan_aborting = false;
			dev_dbg(adapter->dev, "info: scan already aborted\n");
		}
		goto done;
	}

	if (!atomic_read(&priv->adapter->is_tx_received)) {
		adapter->empty_tx_q_cnt++;
		if (adapter->empty_tx_q_cnt == MWIFIEX_MAX_EMPTY_TX_Q_CNT) {
			/*
			 * No Tx traffic for 200msec. Get scan command from
			 * scan pending queue and put to cmd pending queue to
			 * resume scan operation
			 */
			adapter->scan_delay_cnt = 0;
			adapter->empty_tx_q_cnt = 0;
			spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
			cmd_node = list_first_entry(&adapter->scan_pending_q,
						    struct cmd_ctrl_node, list);
			list_del(&cmd_node->list);
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
					       flags);

			mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
							true);
			queue_work(adapter->workqueue, &adapter->main_work);
			goto done;
		}
	} else {
		adapter->empty_tx_q_cnt = 0;
	}

	/* Delay scan operation further by 20msec */
	mod_timer(&priv->scan_delay_timer, jiffies +
		  msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
	adapter->scan_delay_cnt++;

done:
	if (atomic_read(&priv->adapter->is_tx_received))
		atomic_set(&priv->adapter->is_tx_received, false);

	return;
}

/*
 * This function registers the device and performs all the necessary
 * initializations.
 *
 * The following initialization operations are performed -
 *      - Allocate adapter structure
 *      - Save interface specific operations table in adapter
 *      - Call interface specific initialization routine
 *      - Allocate private structures
 *      - Set default adapter structure parameters
 *      - Initialize locks
 *
 * In case of any errors during inittialization, this function also ensures
 * proper cleanup before exiting.
 */
static int mwifiex_register(void *card, struct mwifiex_if_ops *if_ops,
			    void **padapter)
{
	struct mwifiex_adapter *adapter;
	int i;

	adapter = kzalloc(sizeof(struct mwifiex_adapter), GFP_KERNEL);
	if (!adapter)
		return -ENOMEM;

	*padapter = adapter;
	adapter->card = card;

	/* Save interface specific operations in adapter */
	memmove(&adapter->if_ops, if_ops, sizeof(struct mwifiex_if_ops));

	/* card specific initialization has been deferred until now .. */
	if (adapter->if_ops.init_if)
		if (adapter->if_ops.init_if(adapter))