drivers/net/wireless/libertas/main.c

/**
  * This file contains the major functions in WLAN
  * driver. It includes init, exit, open, close and main
  * thread etc..
  */

#include <linux/moduleparam.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/kthread.h>
#include <linux/kfifo.h>
#include <linux/stddef.h>
#include <linux/ieee80211.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>

#include "host.h"
#include "decl.h"
#include "dev.h"
#include "wext.h"
#include "cfg.h"
#include "debugfs.h"
#include "scan.h"
#include "assoc.h"
#include "cmd.h"

#define DRIVER_RELEASE_VERSION "323.p0"
const char lbs_driver_version[] = "COMM-USB8388-" DRIVER_RELEASE_VERSION
#ifdef  DEBUG
    "-dbg"
#endif
    "";


/* Module parameters */
unsigned int lbs_debug;
EXPORT_SYMBOL_GPL(lbs_debug);
module_param_named(libertas_debug, lbs_debug, int, 0644);


/* This global structure is used to send the confirm_sleep command as
 * fast as possible down to the firmware. */
struct cmd_confirm_sleep confirm_sleep;


/**
 * the table to keep region code
 */
u16 lbs_region_code_to_index[MRVDRV_MAX_REGION_CODE] =
    { 0x10, 0x20, 0x30, 0x31, 0x32, 0x40 };

/**
 * FW rate table.  FW refers to rates by their index in this table, not by the
 * rate value itself.  Values of 0x00 are
 * reserved positions.
 */
static u8 fw_data_rates[MAX_RATES] =
    { 0x02, 0x04, 0x0B, 0x16, 0x00, 0x0C, 0x12,
      0x18, 0x24, 0x30, 0x48, 0x60, 0x6C, 0x00
};

/**
 *  @brief use index to get the data rate
 *
 *  @param idx                The index of data rate
 *  @return 	   		data rate or 0
 */
u32 lbs_fw_index_to_data_rate(u8 idx)
{
	if (idx >= sizeof(fw_data_rates))
		idx = 0;
	return fw_data_rates[idx];
}

/**
 *  @brief use rate to get the index
 *
 *  @param rate                 data rate
 *  @return 	   		index or 0
 */
u8 lbs_data_rate_to_fw_index(u32 rate)
{
	u8 i;

	if (!rate)
		return 0;

	for (i = 0; i < sizeof(fw_data_rates); i++) {
		if (rate == fw_data_rates[i])
			return i;
	}
	return 0;
}


static int lbs_add_rtap(struct lbs_private *priv);
static void lbs_remove_rtap(struct lbs_private *priv);


/**
 * Get function for sysfs attribute rtap
 */
static ssize_t lbs_rtap_get(struct device *dev,
		struct device_attribute *attr, char * buf)
{
	struct lbs_private *priv = to_net_dev(dev)->ml_priv;
	return snprintf(buf, 5, "0x%X\n", priv->monitormode);
}

/**
 *  Set function for sysfs attribute rtap
 */
static ssize_t lbs_rtap_set(struct device *dev,
		struct device_attribute *attr, const char * buf, size_t count)
{
	int monitor_mode;
	struct lbs_private *priv = to_net_dev(dev)->ml_priv;

	sscanf(buf, "%x", &monitor_mode);
	if (monitor_mode) {
		if (priv->monitormode == monitor_mode)
			return strlen(buf);
		if (!priv->monitormode) {
			if (priv->infra_open || priv->mesh_open)
				return -EBUSY;
			if (priv->mode == IW_MODE_INFRA)
				lbs_cmd_80211_deauthenticate(priv,
							     priv->curbssparams.bssid,
							     WLAN_REASON_DEAUTH_LEAVING);
			else if (priv->mode == IW_MODE_ADHOC)
				lbs_adhoc_stop(priv);
			lbs_add_rtap(priv);
		}
		priv->monitormode = monitor_mode;
	} else {
		if (!priv->monitormode)
			return strlen(buf);
		priv->monitormode = 0;
		lbs_remove_rtap(priv);

		if (priv->currenttxskb) {
			dev_kfree_skb_any(priv->currenttxskb);
			priv->currenttxskb = NULL;
		}

		/* Wake queues, command thread, etc. */
		lbs_host_to_card_done(priv);
	}

	lbs_prepare_and_send_command(priv,
			CMD_802_11_MONITOR_MODE, CMD_ACT_SET,
			CMD_OPTION_WAITFORRSP, 0, &priv->monitormode);
	return strlen(buf);
}

/**
 * lbs_rtap attribute to be exported per ethX interface
 * through sysfs (/sys/class/net/ethX/lbs_rtap)
 */
static DEVICE_ATTR(lbs_rtap, 0644, lbs_rtap_get, lbs_rtap_set );

/**
 *  @brief This function opens the ethX interface
 *
 *  @param dev     A pointer to net_device structure
 *  @return 	   0 or -EBUSY if monitor mode active
 */
static int lbs_dev_open(struct net_device *dev)
{
	struct lbs_private *priv = dev->ml_priv;
	int ret = 0;

	lbs_deb_enter(LBS_DEB_NET);

	spin_lock_irq(&priv->driver_lock);

	if (priv->monitormode) {
		ret = -EBUSY;
		goto out;
	}

	priv->infra_open = 1;

	if (priv->connect_status == LBS_CONNECTED)
		netif_carrier_on(dev);
	else
		netif_carrier_off(dev);

	if (!priv->tx_pending_len)
		netif_wake_queue(dev);
 out:

	spin_unlock_irq(&priv->driver_lock);
	lbs_deb_leave_args(LBS_DEB_NET, "ret %d", ret);
	return ret;
}

/**
 *  @brief This function closes the ethX interface
 *
 *  @param dev     A pointer to net_device structure
 *  @return 	   0
 */
static int lbs_eth_stop(struct net_device *dev)
{
	struct lbs_private *priv = dev->ml_priv;

	lbs_deb_enter(LBS_DEB_NET);

	spin_lock_irq(&priv->driver_lock);
	priv->infra_open = 0;
	netif_stop_queue(dev);
	spin_unlock_irq(&priv->driver_lock);

	schedule_work(&priv->mcast_work);

	lbs_deb_leave(LBS_DEB_NET);
	return 0;
}

static void lbs_tx_timeout(struct net_device *dev)
{
	struct lbs_private *priv = dev->ml_priv;

	lbs_deb_enter(LBS_DEB_TX);

	lbs_pr_err("tx watch dog timeout\n");

	dev->trans_start = jiffies;

	if (priv->currenttxskb)
		lbs_send_tx_feedback(priv, 0);

	/* XX: Shouldn't we also call into the hw-specific driver
	   to kick it somehow? */
	lbs_host_to_card_done(priv);

	/* More often than not, this actually happens because the
	   firmware has crapped itself -- rather than just a very
	   busy medium. So send a harmless command, and if/when
	   _that_ times out, we'll kick it in the head. */
	lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
				     0, 0, NULL);

	lbs_deb_leave(LBS_DEB_TX);
}

void lbs_host_to_card_done(struct lbs_private *priv)
{
	unsigned long flags;

	lbs_deb_enter(LBS_DEB_THREAD);

	spin_lock_irqsave(&priv->driver_lock, flags);

	priv->dnld_sent = DNLD_RES_RECEIVED;

	/* Wake main thread if commands are pending */
	if (!priv->cur_cmd || priv->tx_pending_len > 0) {
		if (!priv->wakeup_dev_required)
			wake_up_interruptible(&priv->waitq);
	}

	spin_unlock_irqrestore(&priv->driver_lock, flags);
	lbs_deb_leave(LBS_DEB_THREAD);
}
EXPORT_SYMBOL_GPL(lbs_host_to_card_done);

int lbs_set_mac_address(struct net_device *dev, void *addr)
{
	int ret = 0;
	struct lbs_private *priv = dev->ml_priv;
	struct sockaddr *phwaddr = addr;
	struct cmd_ds_802_11_mac_address cmd;

	lbs_deb_enter(LBS_DEB_NET);

	/* In case it was called from the mesh device */
	dev = priv->dev;

	cmd.hdr.size = cpu_to_le16(sizeof(cmd));
	cmd.action = cpu_to_le16(CMD_ACT_SET);
	memcpy(cmd.macadd, phwaddr->sa_data, ETH_ALEN);

	ret = lbs_cmd_with_response(priv, CMD_802_11_MAC_ADDRESS, &cmd);
	if (ret) {
		lbs_deb_net("set MAC address failed\n");
		goto done;
	}

	memcpy(priv->current_addr, phwaddr->sa_data, ETH_ALEN);
	memcpy(dev->dev_addr, phwaddr->sa_data, ETH_ALEN);
	if (priv->mesh_dev)
		memcpy(priv->mesh_dev->dev_addr, phwaddr->sa_data, ETH_ALEN);

done:
	lbs_deb_leave_args(LBS_DEB_NET, "ret %d", ret);
	return ret;
}


static inline int mac_in_list(unsigned char *list, int list_len,
			      unsigned char *mac)
{
	while (list_len) {
		if (!memcmp(list, mac, ETH_ALEN))
			return 1;
		list += ETH_ALEN;
		list_len--;
	}
	return 0;
}


static int lbs_add_mcast_addrs(struct cmd_ds_mac_multicast_adr *cmd,
			       struct net_device *dev, int nr_addrs)
{
	int i = nr_addrs;
	struct dev_mc_list *mc_list;

	if ((dev->flags & (IFF_UP|IFF_MULTICAST)) != (IFF_UP|IFF_MULTICAST))
		return nr_addrs;

	netif_addr_lock_bh(dev);
	for (mc_list = dev->mc_list; mc_list; mc_list = mc_list->next) {
		if (mac_in_list(cmd->maclist, nr_addrs, mc_list->dmi_addr)) {
			lbs_deb_net("mcast address %s:%pM skipped\n", dev->name,
				    mc_list->dmi_addr);
			continue;
		}

		if (i == MRVDRV_MAX_MULTICAST_LIST_SIZE)
			break;
		memcpy(&cmd->maclist[6*i], mc_list->dmi_addr, ETH_ALEN);
		lbs_deb_net("mcast address %s:%pM added to filter\n", dev->name,
			    mc_list->dmi_addr);
		i++;
	}
	netif_addr_unlock_bh(dev);
	if (mc_list)
		return -EOVERFLOW;

	return i;
}

static void lbs_set_mcast_worker(struct work_struct *work)
{
	struct lbs_private *priv = container_of(work, struct lbs_private, mcast_work);
	struct cmd_ds_mac_multicast_adr mcast_cmd;
	int dev_flags;
	int nr_addrs;
	int old_mac_control = priv->mac_control;

	lbs_deb_enter(LBS_DEB_NET);

	dev_flags = priv->dev->flags;
	if (priv->mesh_dev)
		dev_flags |= priv->mesh_dev->flags;

	if (dev_flags & IFF_PROMISC) {
		priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
		priv->mac_control &= ~(CMD_ACT_MAC_ALL_MULTICAST_ENABLE |
				       CMD_ACT_MAC_MULTICAST_ENABLE);
		goto out_set_mac_control;
	} else if (dev_flags & IFF_ALLMULTI) {
	do_allmulti:
		priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
		priv->mac_control &= ~(CMD_ACT_MAC_PROMISCUOUS_ENABLE |
				       CMD_ACT_MAC_MULTICAST_ENABLE);
		goto out_set_mac_control;
	}

	/* Once for priv->dev, again for priv->mesh_dev if it exists */
	nr_addrs = lbs_add_mcast_addrs(&mcast_cmd, priv->dev, 0);
	if (nr_addrs >= 0 && priv->mesh_dev)
		nr_addrs = lbs_add_mcast_addrs(&mcast_cmd, priv->mesh_dev, nr_addrs);
	if (nr_addrs < 0)
		goto do_allmulti;

	if (nr_addrs) {
		int size = offsetof(struct cmd_ds_mac_multicast_adr,
				    maclist[6*nr_addrs]);

		mcast_cmd.action = cpu_to_le16(CMD_ACT_SET);
		mcast_cmd.hdr.size = cpu_to_le16(size);
		mcast_cmd.nr_of_adrs = cpu_to_le16(nr_addrs);

		lbs_cmd_async(priv, CMD_MAC_MULTICAST_ADR, &mcast_cmd.hdr, size);

		priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
	} else
		priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;

	priv->mac_control &= ~(CMD_ACT_MAC_PROMISCUOUS_ENABLE |
			       CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
 out_set_mac_control:
	if (priv->mac_control != old_mac_control)
		lbs_set_mac_control(priv);

	lbs_deb_leave(LBS_DEB_NET);
}

void lbs_set_multicast_list(struct net_device *dev)
{
	struct lbs_private *priv = dev->ml_priv;

	schedule_work(&priv->mcast_work);
}

/**
 *  @brief This function handles the major jobs in the LBS driver.
 *  It handles all events generated by firmware, RX data received
 *  from firmware and TX data sent from kernel.
 *
 *  @param data    A pointer to lbs_thread structure
 *  @return 	   0
 */
static int lbs_thread(void *data)
{
	struct net_device *dev = data;
	struct lbs_private *priv = dev->ml_priv;
	wait_queue_t wait;

	lbs_deb_enter(LBS_DEB_THREAD);

	init_waitqueue_entry(&wait, current);

	for (;;) {
		int shouldsleep;
		u8 resp_idx;

		lbs_deb_thread("1: currenttxskb %p, dnld_sent %d\n",
				priv->currenttxskb, priv->dnld_sent);

		add_wait_queue(&priv->waitq, &wait);
		set_current_state(TASK_INTERRUPTIBLE);
		spin_lock_irq(&priv->driver_lock);

		if (kthread_should_stop())
			shouldsleep = 0;	/* Bye */
		else if (priv->surpriseremoved)
			shouldsleep = 1;	/* We need to wait until we're _told_ to die */
		else if (priv->psstate == PS_STATE_SLEEP)
			shouldsleep = 1;	/* Sleep mode. Nothing we can do till it wakes */
		else if (priv->cmd_timed_out)
			shouldsleep = 0;	/* Command timed out. Recover */
		else if (!priv->fw_ready)
			shouldsleep = 1;	/* Firmware not ready. We're waiting for it */
		else if (priv->dnld_sent)
			shouldsleep = 1;	/* Something is en route to the device already */
		else if (priv->tx_pending_len > 0)
			shouldsleep = 0;	/* We've a packet to send */
		else if (priv->resp_len[priv->resp_idx])
			shouldsleep = 0;	/* We have a command response */
		else if (priv->cur_cmd)
			shouldsleep = 1;	/* Can't send a command; one already running */
		else if (!list_empty(&priv->cmdpendingq) &&
					!(priv->wakeup_dev_required))
			shouldsleep = 0;	/* We have a command to send */
		else if (kfifo_len(&priv->event_fifo))
			shouldsleep = 0;	/* We have an event to process */
		else
			shouldsleep = 1;	/* No command */

		if (shouldsleep) {
			lbs_deb_thread("sleeping, connect_status %d, "
				"psmode %d, psstate %d\n",
				priv->connect_status,
				priv->psmode, priv->psstate);
			spin_unlock_irq(&priv->driver_lock);
			schedule();
		} else
			spin_unlock_irq(&priv->driver_lock);

		lbs_deb_thread("2: currenttxskb %p, dnld_send %d\n",
			       priv->currenttxskb, priv->dnld_sent);

		set_current_state(TASK_RUNNING);
		remove_wait_queue(&priv->waitq, &wait);

		lbs_deb_thread("3: currenttxskb %p, dnld_sent %d\n",
			       priv->currenttxskb, priv->dnld_sent);

		if (kthread_should_stop()) {
			lbs_deb_thread("break from main thread\n");
			break;
		}

		if (priv->surpriseremoved) {
			lbs_deb_thread("adapter removed; waiting to die...\n");
			continue;
		}

		lbs_deb_thread("4: currenttxskb %p, dnld_sent %d\n",
		       priv->currenttxskb, priv->dnld_sent);

		/* Process any pending command response */
		spin_lock_irq(&priv->driver_lock);
		resp_idx = priv->resp_idx;
		if (priv->resp_len[resp_idx]) {
			spin_unlock_irq(&priv->driver_lock);
			lbs_process_command_response(priv,
				priv->resp_buf[resp_idx],
				priv->resp_len[resp_idx]);
			spin_lock_irq(&priv->driver_lock);
			priv->resp_len[resp_idx] = 0;
		}
		spin_unlock_irq(&priv->driver_lock);

		/* Process hardware events, e.g. card removed, link lost */
		spin_lock_irq(&priv->driver_lock);
		while (kfifo_len(&priv->event_fifo)) {
			u32 event;

			kfifo_out(&priv->event_fifo, (unsigned char *) &event,
				sizeof(event));
			spin_unlock_irq(&priv->driver_lock);
			lbs_process_event(priv, event);
			spin_lock_irq(&priv->driver_lock);
		}
		spin_unlock_irq(&priv->driver_lock);

		if (priv->wakeup_dev_required) {
			lbs_deb_thread("Waking up device...\n");
			/* Wake up device */
			if (priv->exit_deep_sleep(priv))
				lbs_deb_thread("Wakeup device failed\n");
			continue;
		}

		/* command timeout stuff */
		if (priv->cmd_timed_out && priv->cur_cmd) {
			struct cmd_ctrl_node *cmdnode = priv->cur_cmd;

			if (++priv->nr_retries > 3) {
				lbs_pr_info("Excessive timeouts submitting "
					"command 0x%04x\n",
					le16_to_cpu(cmdnode->cmdbuf->command));
				lbs_complete_command(priv, cmdnode, -ETIMEDOUT);
				priv->nr_retries = 0;
				if (priv->reset_card)
					priv->reset_card(priv);
			} else {
				priv->cur_cmd = NULL;
				priv->dnld_sent = DNLD_RES_RECEIVED;
				lbs_pr_info("requeueing command 0x%04x due "
					"to timeout (#%d)\n",
					le16_to_cpu(cmdnode->cmdbuf->command),
					priv->nr_retries);

				/* Stick it back at the _top_ of the pending queue
				   for immediate resubmission */
				list_add(&cmdnode->list, &priv->cmdpendingq);
			}
		}
		priv->cmd_timed_out = 0;



		if (!priv->fw_ready)
			continue;

		/* Check if we need to confirm Sleep Request received previously */
		if (priv->psstate == PS_STATE_PRE_SLEEP &&
		    !priv->dnld_sent && !priv->cur_cmd) {
			if (priv->connect_status == LBS_CONNECTED) {
				lbs_deb_thread("pre-sleep, currenttxskb %p, "
					"dnld_sent %d, cur_cmd %p\n",
					priv->currenttxskb, priv->dnld_sent,
					priv->cur_cmd);

				lbs_ps_confirm_sleep(priv);
			} else {
				/* workaround for firmware sending
				 * deauth/linkloss event immediately
				 * after sleep request; remove this
				 * after firmware fixes it
				 */
				priv->psstate = PS_STATE_AWAKE;
				lbs_pr_alert("ignore PS_SleepConfirm in "
					"non-connected state\n");
			}
		}

		/* The PS state is changed during processing of Sleep Request
		 * event above
		 */
		if ((priv->psstate == PS_STATE_SLEEP) ||
		    (priv->psstate == PS_STATE_PRE_SLEEP))
			continue;

		if (priv->is_deep_sleep)
			continue;

		/* Execute the next command */
		if (!priv->dnld_sent && !priv->cur_cmd)
			lbs_execute_next_command(priv);

		/* Wake-up command waiters which can't sleep in
		 * lbs_prepare_and_send_command
		 */
		if (!list_empty(&priv->cmdpendingq))
			wake_up_all(&priv->cmd_pending);

		spin_lock_irq(&priv->driver_lock);
		if (!priv->dnld_sent && priv->tx_pending_len > 0) {
			int ret = priv->hw_host_to_card(priv, MVMS_DAT,
							priv->tx_pending_buf,
							priv->tx_pending_len);
			if (ret) {
				lbs_deb_tx("host_to_card failed %d\n", ret);
				priv->dnld_sent = DNLD_RES_RECEIVED;
			}
			priv->tx_pending_len = 0;
			if (!priv->currenttxskb) {
				/* We can wake the queues immediately if we aren't
				   waiting for TX feedback */
				if (priv->connect_status == LBS_CONNECTED)
					netif_wake_queue(priv->dev);
				if (priv->mesh_dev &&
				    priv->mesh_connect_status == LBS_CONNECTED)
					netif_wake_queue(priv->mesh_dev);
			}
		}
		spin_unlock_irq(&priv->driver_lock);
	}

	del_timer(&priv->command_timer);
	del_timer(&priv->auto_deepsleep_timer);
	wake_up_all(&priv->cmd_pending);

	lbs_deb_leave(LBS_DEB_THREAD);
	return 0;
}

static int lbs_suspend_callback(struct lbs_private *priv, unsigned long dummy,
				struct cmd_header *cmd)
{
	lbs_deb_enter(LBS_DEB_FW);

	netif_device_detach(priv->dev);
	if (priv->mesh_dev)
		netif_device_detach(priv->mesh_dev);

	priv->fw_ready = 0;
	lbs_deb_leave(LBS_DEB_FW);
	return 0;
}

int lbs_suspend(struct lbs_private *priv)
{
	struct cmd_header cmd;
	int ret;

	lbs_deb_enter(LBS_DEB_FW);

	if (priv->wol_criteria == 0xffffffff) {
		lbs_pr_info("Suspend attempt without configuring wake params!\n");
		return -EINVAL;
	}

	memset(&cmd, 0, sizeof(cmd));

	ret = __lbs_cmd(priv, CMD_802_11_HOST_SLEEP_ACTIVATE, &cmd,
			sizeof(cmd), lbs_suspend_callback, 0);
	if (ret)
		lbs_pr_info("HOST_SLEEP_ACTIVATE failed: %d\n", ret);

	lbs_deb_leave_args(LBS_DEB_FW, "ret %d", ret);
	return ret;
}
EXPORT_SYMBOL_GPL(lbs_suspend);

void lbs_resume(struct lbs_private *priv)
{
	lbs_deb_enter(LBS_DEB_FW);

	priv->fw_ready = 1;

	/* Firmware doesn't seem to give us RX packets any more
	   until we send it some command. Might as well update */
	lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
				     0, 0, NULL);

	netif_device_attach(priv->dev);
	if (priv->mesh_dev)
		netif_device_attach(priv->mesh_dev);

	lbs_deb_leave(LBS_DEB_FW);
}
EXPORT_SYMBOL_GPL(lbs_resume);

/**
 * @brief This function gets the HW spec from the firmware and sets
 *        some basic parameters.
 *
 *  @param priv    A pointer to struct lbs_private structure
 *  @return 	   0 or -1
 */
static int lbs_setup_firmware(struct lbs_private *priv)
{
	int ret = -1;
	s16 curlevel = 0, minlevel = 0, maxlevel = 0;

	lbs_deb_enter(LBS_DEB_FW);

	/* Read MAC address from firmware */
	memset(priv->current_addr, 0xff, ETH_ALEN);
	ret = lbs_update_hw_spec(priv);
	if (ret)
		goto done;

	/* Read power levels if available */
	ret = lbs_get_tx_power(priv, &curlevel, &minlevel, &maxlevel);
	if (ret == 0) {
		priv->txpower_cur = curlevel;
		priv->txpower_min = minlevel;
		priv->txpower_max = maxlevel;
	}

	lbs_set_mac_control(priv);
done:
	lbs_deb_leave_args(LBS_DEB_FW, "ret %d", ret);
	return ret;
}

/**
 *  This function handles the timeout of command sending.
 *  It will re-send the same command again.
 */
static void command_timer_fn(unsigned long data)
{
	struct lbs_private *priv = (struct lbs_private *)data;
	unsigned long flags;

	lbs_deb_enter(LBS_DEB_CMD);
	spin_lock_irqsave(&priv->driver_lock, flags);

	if (!priv->cur_cmd)
		goto out;

	lbs_pr_info("command 0x%04x timed out\n",
		le16_to_cpu(priv->cur_cmd->cmdbuf->command));

	priv->cmd_timed_out = 1;
	wake_up_interruptible(&priv->waitq);
out:
	spin_unlock_irqrestore(&priv->driver_lock, flags);
	lbs_deb_leave(LBS_DEB_CMD);
}

/**
 *  This function put the device back to deep sleep mode when timer expires
 *  and no activity (command, event, data etc.) is detected.
 */
static void auto_deepsleep_timer_fn(unsigned long data)
{
	struct lbs_private *priv = (struct lbs_private *)data;
	int ret;

	lbs_deb_enter(LBS_DEB_CMD);

	if (priv->is_activity_detected) {
		priv->is_activity_detected = 0;
	} else {
		if (priv->is_auto_deep_sleep_enabled &&
				(!priv->wakeup_dev_required) &&
				(priv->connect_status != LBS_CONNECTED)) {
			lbs_deb_main("Entering auto deep sleep mode...\n");
			ret = lbs_prepare_and_send_command(priv,
					CMD_802_11_DEEP_SLEEP, 0,
					0, 0, NULL);
			if (ret)
				lbs_pr_err("Enter Deep Sleep command failed\n");
		}
	}
	mod_timer(&priv->auto_deepsleep_timer , jiffies +
				(priv->auto_deep_sleep_timeout * HZ)/1000);
	lbs_deb_leave(LBS_DEB_CMD);
}

int lbs_enter_auto_deep_sleep(struct lbs_private *priv)
{
	lbs_deb_enter(LBS_DEB_SDIO);

	priv->is_auto_deep_sleep_enabled = 1;
	if (priv->is_deep_sleep)
		priv->wakeup_dev_required = 1;
	mod_timer(&priv->auto_deepsleep_timer ,
			jiffies + (priv->auto_deep_sleep_timeout * HZ)/1000);

	lbs_deb_leave(LBS_DEB_SDIO);
	return 0;
}

int lbs_exit_auto_deep_sleep(struct lbs_private *priv)
{
	lbs_deb_enter(LBS_DEB_SDIO);

	priv->is_auto_deep_sleep_enabled = 0;
	priv->auto_deep_sleep_timeout = 0;
	del_timer(&priv->auto_deepsleep_timer);

	lbs_deb_leave(LBS_DEB_SDIO);
	return 0;
}

static void lbs_sync_channel_worker(struct work_struct *work)
{
	struct lbs_private *priv = container_of(work, struct lbs_private,
		sync_channel);

	lbs_deb_enter(LBS_DEB_MAIN);
	if (lbs_update_channel(priv))
		lbs_pr_info("Channel synchronization failed.");
	lbs_deb_leave(LBS_DEB_MAIN);
}


static int lbs_init_adapter(struct lbs_private *priv)
{
	size_t bufsize;
	int i, ret = 0;

	lbs_deb_enter(LBS_DEB_MAIN);

	/* Allocate buffer to store the BSSID list */
	bufsize = MAX_NETWORK_COUNT * sizeof(struct bss_descriptor);
	priv->networks = kzalloc(bufsize, GFP_KERNEL);
	if (!priv->networks) {
		lbs_pr_err("Out of memory allocating beacons\n");
		ret = -1;
		goto out;
	}

	/* Initialize scan result lists */
	INIT_LIST_HEAD(&priv->network_free_list);
	INIT_LIST_HEAD(&priv->network_list);
	for (i = 0; i < MAX_NETWORK_COUNT; i++) {
		list_add_tail(&priv->networks[i].list,
			      &priv->network_free_list);
	}

	memset(priv->current_addr, 0xff, ETH_ALEN);

	priv->connect_status = LBS_DISCONNECTED;
	priv->mesh_connect_status = LBS_DISCONNECTED;
	priv->secinfo.auth_mode = IW_AUTH_ALG_OPEN_SYSTEM;
	priv->mode = IW_MODE_INFRA;
	priv->channel = DEFAULT_AD_HOC_CHANNEL;
	priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
	priv->radio_on = 1;
	priv->enablehwauto = 1;
	priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
	priv->psmode = LBS802_11POWERMODECAM;
	priv->psstate = PS_STATE_FULL_POWER;
	priv->is_deep_sleep = 0;
	priv->is_auto_deep_sleep_enabled = 0;
	priv->wakeup_dev_required = 0;
	init_waitqueue_head(&priv->ds_awake_q);

	mutex_init(&priv->lock);

	setup_timer(&priv->command_timer, command_timer_fn,
		(unsigned long)priv);
	setup_timer(&priv->auto_deepsleep_timer, auto_deepsleep_timer_fn,
			(unsigned long)priv);

	INIT_LIST_HEAD(&priv->cmdfreeq);
	INIT_LIST_HEAD(&priv->cmdpendingq);

	spin_lock_init(&priv->driver_lock);
	init_waitqueue_head(&priv->cmd_pending);

	/* Allocate the command buffers */
	if (lbs_allocate_cmd_buffer(priv)) {
		lbs_pr_err("Out of memory allocating command buffers\n");
		ret = -ENOMEM;
		goto out;
	}
	priv->resp_idx = 0;
	priv->resp_len[0] = priv->resp_len[1] = 0;

	/* Create the event FIFO */
	ret = kfifo_alloc(&priv->event_fifo, sizeof(u32) * 16, GFP_KERNEL);
	if (ret) {
		lbs_pr_err("Out of memory allocating event FIFO buffer\n");
		goto out;
	}

out:
	lbs_deb_leave_args(LBS_DEB_MAIN, "ret %d", ret);

	return ret;
}

static void lbs_free_adapter(struct lbs_private *priv)
{
	lbs_deb_enter(LBS_DEB_MAIN);

	lbs_free_cmd_buffer(priv);
	kfifo_free(&priv->event_fifo);
	del_timer(&priv->command_timer);
	del_timer(&priv->auto_deepsleep_timer);
	kfree(priv->networks);
	priv->networks = NULL;

	lbs_deb_leave(LBS_DEB_MAIN);
}

static const struct net_device_ops lbs_netdev_ops = {
	.ndo_open 		= lbs_dev_open,
	.ndo_stop		= lbs_eth_stop,
	.ndo_start_xmit		= lbs_hard_start_xmit,
	.ndo_set_mac_address	= lbs_set_mac_address,
	.ndo_tx_timeout 	= lbs_tx_timeout,
	.ndo_set_multicast_list = lbs_set_multicast_list,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
};

/**
 * @brief This function adds the card. it will probe the
 * card, allocate the lbs_priv and initialize the device.
 *
 *  @param card    A pointer to card
 *  @return 	   A pointer to struct lbs_private structure
 */
struct lbs_private *lbs_add_card(void *card, struct device *dmdev)
{
	struct net_device *dev;
	struct wireless_dev *wdev;
	struct lbs_private *priv = NULL;

	lbs_deb_enter(LBS_DEB_MAIN);

	/* Allocate an Ethernet device and register it */
	wdev = lbs_cfg_alloc(dmdev);
	if (IS_ERR(wdev)) {
		lbs_pr_err("cfg80211 init failed\n");
		goto done;
	}
	/* TODO? */
	wdev->iftype = NL80211_IFTYPE_STATION;
	priv = wdev_priv(wdev);
	priv->wdev = wdev;

	if (lbs_init_adapter(priv)) {
		lbs_pr_err("failed to initialize adapter structure.\n");
		goto err_wdev;
	}

	//TODO? dev = alloc_netdev_mq(0, "wlan%d", ether_setup, IWM_TX_QUEUES);
	dev = alloc_netdev(0, "wlan%d", ether_setup);
	if (!dev) {
		dev_err(dmdev, "no memory for network device instance\n");
		goto err_adapter;
	}

	dev->ieee80211_ptr = wdev;
	dev->ml_priv = priv;
	SET_NETDEV_DEV(dev, dmdev);
	wdev->netdev = dev;
	priv->dev = dev;

 	dev->netdev_ops = &lbs_netdev_ops;
	dev->watchdog_timeo = 5 * HZ;
	dev->ethtool_ops = &lbs_ethtool_ops;
#ifdef	WIRELESS_EXT
	dev->wireless_handlers = &lbs_handler_def;
#endif
	dev->flags |= IFF_BROADCAST | IFF_MULTICAST;


	// TODO: kzalloc + iwm_init_default_profile(iwm, iwm->umac_profile); ??


	priv->card = card;
	priv->infra_open = 0;


	priv->rtap_net_dev = NULL;
	strcpy(dev->name, "wlan%d");

	lbs_deb_thread("Starting main thread...\n");
	init_waitqueue_head(&priv->waitq);
	priv->main_thread = kthread_run(lbs_thread, dev, "lbs_main");
	if (IS_ERR(priv->main_thread)) {
		lbs_deb_thread("Error creating main thread.\n");
		goto err_ndev;
	}

	priv->work_thread = create_singlethread_workqueue("lbs_worker");
	INIT_DELAYED_WORK(&priv->assoc_work, lbs_association_worker);
	INIT_DELAYED_WORK(&priv->scan_work, lbs_scan_worker);
	INIT_WORK(&priv->mcast_work, lbs_set_mcast_worker);
	INIT_WORK(&priv->sync_channel, lbs_sync_channel_worker);

	priv->mesh_open = 0;
	sprintf(priv->mesh_ssid, "mesh");
	priv->mesh_ssid_len = 4;

	priv->wol_criteria = 0xffffffff;
	priv->wol_gpio = 0xff;

	goto done;

 err_ndev:
	free_netdev(dev);

 err_adapter:
	lbs_free_adapter(priv);

 err_wdev:
	lbs_cfg_free(priv);

	priv = NULL;

done:
	lbs_deb_leave_args(LBS_DEB_MAIN, "priv %p", priv);
	return priv;
}
EXPORT_SYMBOL_GPL(lbs_add_card);


void lbs_remove_card(struct lbs_private *priv)
{
	struct net_device *dev = priv->dev;

	lbs_deb_enter(LBS_DEB_MAIN);

	lbs_remove_mesh(priv);
	lbs_remove_rtap(priv);

	dev = priv->dev;

	cancel_delayed_work_sync(&priv->scan_work);
	cancel_delayed_work_sync(&priv->assoc_work);
	cancel_work_sync(&priv->mcast_work);

	/* worker thread destruction blocks on the in-flight command which
	 * should have been cleared already in lbs_stop_card().
	 */
	lbs_deb_main("destroying worker thread\n");
	destroy_workqueue(priv->work_thread);
	lbs_deb_main("done destroying worker thread\n");

	if (priv->psmode == LBS802_11POWERMODEMAX_PSP) {
		priv->psmode = LBS802_11POWERMODECAM;
		lbs_ps_wakeup(priv, CMD_OPTION_WAITFORRSP);
	}

	lbs_send_disconnect_notification(priv);

	if (priv->is_deep_sleep) {
		priv->is_deep_sleep = 0;
		wake_up_interruptible(&priv->ds_awake_q);
	}

	/* Stop the thread servicing the interrupts */
	priv->surpriseremoved = 1;
	kthread_stop(priv->main_thread);

	lbs_free_adapter(priv);
	lbs_cfg_free(priv);

	priv->dev = NULL;
	free_netdev(dev);

	lbs_deb_leave(LBS_DEB_MAIN);
}
EXPORT_SYMBOL_GPL(lbs_remove_card);


int lbs_start_card(struct lbs_private *priv)
{
	struct net_device *dev = priv->dev;
	int ret = -1;

	lbs_deb_enter(LBS_DEB_MAIN);

	/* poke the firmware */
	ret = lbs_setup_firmware(priv);
	if (ret)
		goto done;

	if (lbs_cfg_register(priv)) {
		lbs_pr_err("cannot register device\n");
		goto done;
	}

	lbs_update_channel(priv);

	/*
	 * While rtap isn't related to mesh, only mesh-enabled
	 * firmware implements the rtap functionality via
	 * CMD_802_11_MONITOR_MODE.
	 */
	if (lbs_init_mesh(priv)) {
		if (device_create_file(&dev->dev, &dev_attr_lbs_rtap))
			lbs_pr_err("cannot register lbs_rtap attribute\n");
	}

	lbs_debugfs_init_one(priv, dev);

	lbs_pr_info("%s: Marvell WLAN 802.11 adapter\n", dev->name);

	ret = 0;

done:
	lbs_deb_leave_args(LBS_DEB_MAIN, "ret %d", ret);
	return ret;
}
EXPORT_SYMBOL_GPL(lbs_start_card);


void lbs_stop_card(struct lbs_private *priv)
{
	struct net_device *dev;
	struct cmd_ctrl_node *cmdnode;
	unsigned long flags;

	lbs_deb_enter(LBS_DEB_MAIN);

	if (!priv)
		goto out;
	dev = priv->dev;

	netif_stop_queue(dev);
	netif_carrier_off(dev);

	lbs_debugfs_remove_one(priv);
	if (lbs_deinit_mesh(priv))
		device_remove_file(&dev->dev, &dev_attr_lbs_rtap);

	/* Delete the timeout of the currently processing command */
	del_timer_sync(&priv->command_timer);
	del_timer_sync(&priv->auto_deepsleep_timer);

	/* Flush pending command nodes */
	spin_lock_irqsave(&priv->driver_lock, flags);
	lbs_deb_main("clearing pending commands\n");
	list_for_each_entry(cmdnode, &priv->cmdpendingq, list) {
		cmdnode->result = -ENOENT;
		cmdnode->cmdwaitqwoken = 1;
		wake_up_interruptible(&cmdnode->cmdwait_q);
	}

	/* Flush the command the card is currently processing */
	if (priv->cur_cmd) {
		lbs_deb_main("clearing current command\n");
		priv->cur_cmd->result = -ENOENT;
		priv->cur_cmd->cmdwaitqwoken = 1;
		wake_up_interruptible(&priv->cur_cmd->cmdwait_q);
	}
	lbs_deb_main("done clearing commands\n");
	spin_unlock_irqrestore(&priv->driver_lock, flags);

	unregister_netdev(dev);

out:
	lbs_deb_leave(LBS_DEB_MAIN);
}
EXPORT_SYMBOL_GPL(lbs_stop_card);


void lbs_queue_event(struct lbs_private *priv, u32 event)
{
	unsigned long flags;

	lbs_deb_enter(LBS_DEB_THREAD);
	spin_lock_irqsave(&priv->driver_lock, flags);

	if (priv->psstate == PS_STATE_SLEEP)
		priv->psstate = PS_STATE_AWAKE;

	kfifo_in(&priv->event_fifo, (unsigned char *) &event, sizeof(u32));

	wake_up_interruptible(&priv->waitq);

	spin_unlock_irqrestore(&priv->driver_lock, flags);
	lbs_deb_leave(LBS_DEB_THREAD);
}
EXPORT_SYMBOL_GPL(lbs_queue_event);

void lbs_notify_command_response(struct lbs_private *priv, u8 resp_idx)
{
	lbs_deb_enter(LBS_DEB_THREAD);

	if (priv->psstate == PS_STATE_SLEEP)
		priv->psstate = PS_STATE_AWAKE;

	/* Swap buffers by flipping the response index */
	BUG_ON(resp_idx > 1);
	priv->resp_idx = resp_idx;

	wake_up_interruptible(&priv->waitq);

	lbs_deb_leave(LBS_DEB_THREAD);
}
EXPORT_SYMBOL_GPL(lbs_notify_command_response);

static int __init lbs_init_module(void)
{
	lbs_deb_enter(LBS_DEB_MAIN);
	memset(&confirm_sleep, 0, sizeof(confirm_sleep));
	confirm_sleep.hdr.command = cpu_to_le16(CMD_802_11_PS_MODE);
	confirm_sleep.hdr.size = cpu_to_le16(sizeof(confirm_sleep));
	confirm_sleep.action = cpu_to_le16(CMD_SUBCMD_SLEEP_CONFIRMED);
	lbs_debugfs_init();
	lbs_deb_leave(LBS_DEB_MAIN);
	return 0;
}

static void __exit lbs_exit_module(void)
{
	lbs_deb_enter(LBS_DEB_MAIN);
	lbs_debugfs_remove();
	lbs_deb_leave(LBS_DEB_MAIN);
}

/*
 * rtap interface support fuctions
 */

static int lbs_rtap_open(struct net_device *dev)
{
	/* Yes, _stop_ the queue. Because we don't support injection */
	lbs_deb_enter(LBS_DEB_MAIN);
	netif_carrier_off(dev);
	netif_stop_queue(dev);
	lbs_deb_leave(LBS_DEB_LEAVE);
	return 0;
}

static int lbs_rtap_stop(struct net_device *dev)
{
	lbs_deb_enter(LBS_DEB_MAIN);
	lbs_deb_leave(LBS_DEB_MAIN);
	return 0;
}

static netdev_tx_t lbs_rtap_hard_start_xmit(struct sk_buff *skb,
					    struct net_device *dev)
{
	netif_stop_queue(dev);
	return NETDEV_TX_BUSY;
}

static void lbs_remove_rtap(struct lbs_private *priv)
{
	lbs_deb_enter(LBS_DEB_MAIN);
	if (priv->rtap_net_dev == NULL)
		goto out;
	unregister_netdev(priv->rtap_net_dev);
	free_netdev(priv->rtap_net_dev);
	priv->rtap_net_dev = NULL;
out:
	lbs_deb_leave(LBS_DEB_MAIN);
}

static const struct net_device_ops rtap_netdev_ops = {
	.ndo_open = lbs_rtap_open,
	.ndo_stop = lbs_rtap_stop,
	.ndo_start_xmit = lbs_rtap_hard_start_xmit,
};

static int lbs_add_rtap(struct lbs_private *priv)
{
	int ret = 0;
	struct net_device *rtap_dev;

	lbs_deb_enter(LBS_DEB_MAIN);
	if (priv->rtap_net_dev) {
		ret = -EPERM;
		goto out;
	}

	rtap_dev = alloc_netdev(0, "rtap%d", ether_setup);
	if (rtap_dev == NULL) {
		ret = -ENOMEM;
		goto out;
	}

	memcpy(rtap_dev->dev_addr, priv->current_addr, ETH_ALEN);
	rtap_dev->type = ARPHRD_IEEE80211_RADIOTAP;
	rtap_dev->netdev_ops = &rtap_netdev_ops;
	rtap_dev->ml_priv = priv;
	SET_NETDEV_DEV(rtap_dev, priv->dev->dev.parent);

	ret = register_netdev(rtap_dev);
	if (ret) {
		free_netdev(rtap_dev);
		goto out;
	}
	priv->rtap_net_dev = rtap_dev;

out:
	lbs_deb_leave_args(LBS_DEB_MAIN, "ret %d", ret);
	return ret;
}

module_init(lbs_init_module);
module_exit(lbs_exit_module);

MODULE_DESCRIPTION("Libertas WLAN Driver Library");
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_LICENSE("GPL");