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

/*
 * Marvell Wireless LAN device driver: major functions
 *
 * Copyright (C) 2011-2014, 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);

/*
 * 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))
			goto error;

	adapter->priv_num = 0;

	for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
		/* Allocate memory for private structure */
		adapter->priv[i] =
			kzalloc(sizeof(struct mwifiex_private), GFP_KERNEL);
		if (!adapter->priv[i])
			goto error;

		adapter->priv[i]->adapter = adapter;
		adapter->priv_num++;
	}
	mwifiex_init_lock_list(adapter);

	init_timer(&adapter->cmd_timer);
	adapter->cmd_timer.function = mwifiex_cmd_timeout_func;
	adapter->cmd_timer.data = (unsigned long) adapter;

	return 0;

error:
	dev_dbg(adapter->dev, "info: leave mwifiex_register with error\n");

	for (i = 0; i < adapter->priv_num; i++)
		kfree(adapter->priv[i]);

	kfree(adapter);

	return -1;
}

/*
 * This function unregisters the device and performs all the necessary
 * cleanups.
 *
 * The following cleanup operations are performed -
 *      - Free the timers
 *      - Free beacon buffers
 *      - Free private structures
 *      - Free adapter structure
 */
static int mwifiex_unregister(struct mwifiex_adapter *adapter)
{
	s32 i;

	if (adapter->if_ops.cleanup_if)
		adapter->if_ops.cleanup_if(adapter);

	del_timer_sync(&adapter->cmd_timer);

	/* Free private structures */
	for (i = 0; i < adapter->priv_num; i++) {
		if (adapter->priv[i]) {
			mwifiex_free_curr_bcn(adapter->priv[i]);
			kfree(adapter->priv[i]);
		}
	}

	vfree(adapter->chan_stats);
	kfree(adapter);
	return 0;
}

static int mwifiex_process_rx(struct mwifiex_adapter *adapter)
{
	unsigned long flags;
	struct sk_buff *skb;

	spin_lock_irqsave(&adapter->rx_proc_lock, flags);
	if (adapter->rx_processing || adapter->rx_locked) {
		spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
		goto exit_rx_proc;
	} else {
		adapter->rx_processing = true;
		spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
	}

	/* Check for Rx data */
	while ((skb = skb_dequeue(&adapter->rx_data_q))) {
		atomic_dec(&adapter->rx_pending);
		if (adapter->delay_main_work &&
		    (atomic_read(&adapter->rx_pending) < LOW_RX_PENDING)) {
			if (adapter->if_ops.submit_rem_rx_urbs)
				adapter->if_ops.submit_rem_rx_urbs(adapter);
			adapter->delay_main_work = false;
			queue_work(adapter->workqueue, &adapter->main_work);
		}
		mwifiex_handle_rx_packet(adapter, skb);
	}
	spin_lock_irqsave(&adapter->rx_proc_lock, flags);
	adapter->rx_processing = false;
	spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);

exit_rx_proc:
	return 0;
}

/*
 * The main process.
 *
 * This function is the main procedure of the driver and handles various driver
 * operations. It runs in a loop and provides the core functionalities.
 *
 * The main responsibilities of this function are -
 *      - Ensure concurrency control
 *      - Handle pending interrupts and call interrupt handlers
 *      - Wake up the card if required
 *      - Handle command responses and call response handlers
 *      - Handle events and call event handlers
 *      - Execute pending commands
 *      - Transmit pending data packets
 */
int mwifiex_main_process(struct mwifiex_adapter *adapter)
{
	int ret = 0;
	unsigned