text: /*
   * mac80211 glue code for mac80211 Prism54 drivers
   *
   * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   *
   * Based on:
   * - the islsm (softmac prism54) driver, which is:
   *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
   * - stlc45xx driver
   *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/firmware.h>
  #include <linux/etherdevice.h>
  #include <linux/module.h>
  
  #include <net/mac80211.h>
  
  #include "p54.h"
  #include "lmac.h"
  
  static int modparam_nohwcrypt;
  module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
  MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  MODULE_DESCRIPTION("Softmac Prism54 common code");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("prism54common");
  
  static int p54_sta_add_remove(struct ieee80211_hw *hw,
  			      struct ieee80211_vif *vif,
  			      struct ieee80211_sta *sta)
  {
  	struct p54_common *priv = hw->priv;
  
  	/*
  	 * Notify the firmware that we don't want or we don't
  	 * need to buffer frames for this station anymore.
  	 */
  
  	p54_sta_unlock(priv, sta->addr);
  
  	return 0;
  }
  
  static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
  			      enum sta_notify_cmd notify_cmd,
  			      struct ieee80211_sta *sta)
  {
  	struct p54_common *priv = dev->priv;
  
  	switch (notify_cmd) {
  	case STA_NOTIFY_AWAKE:
  		/* update the firmware's filter table */
  		p54_sta_unlock(priv, sta->addr);
  		break;
  	default:
  		break;
  	}
  }
  
  static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
  			bool set)
  {
  	struct p54_common *priv = dev->priv;
  
  	return p54_update_beacon_tim(priv, sta->aid, set);
  }
  
  u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
  {
  	struct ieee80211_mgmt *mgmt = (void *)skb->data;
  	u8 *pos, *end;
  
  	if (skb->len <= sizeof(mgmt))
  		return NULL;
  
  	pos = (u8 *)mgmt->u.beacon.variable;
  	end = skb->data + skb->len;
  	while (pos < end) {
  		if (pos + 2 + pos[1] > end)
  			return NULL;
  
  		if (pos[0] == ie)
  			return pos;
  
  		pos += 2 + pos[1];
  	}
  	return NULL;
  }
  
  static int p54_beacon_format_ie_tim(struct sk_buff *skb)
  {
  	/*
  	 * the good excuse for this mess is ... the firmware.
  	 * The dummy TIM MUST be at the end of the beacon frame,
  	 * because it'll be overwritten!
  	 */
  	u8 *tim;
  	u8 dtim_len;
  	u8 dtim_period;
  	u8 *next;
  
  	tim = p54_find_ie(skb, WLAN_EID_TIM);
  	if (!tim)
  		return 0;
  
  	dtim_len = tim[1];
  	dtim_period = tim[3];
  	next = tim + 2 + dtim_len;
  
  	if (dtim_len < 3)
  		return -EINVAL;
  
  	memmove(tim, next, skb_tail_pointer(skb) - next);
  	tim = skb_tail_pointer(skb) - (dtim_len + 2);
  
  	/* add the dummy at the end */
  	tim[0] = WLAN_EID_TIM;
  	tim[1] = 3;
  	tim[2] = 0;
  	tim[3] = dtim_period;
  	tim[4] = 0;
  
  	if (dtim_len > 3)
  		skb_trim(skb, skb->len - (dtim_len - 3));
  
  	return 0;
  }
  
  static int p54_beacon_update(struct p54_common *priv,
  			struct ieee80211_vif *vif)
  {
  	struct sk_buff *beacon;
  	int ret;
  
  	beacon = ieee80211_beacon_get(priv->hw, vif);
  	if (!beacon)
  		return -ENOMEM;
  	ret = p54_beacon_format_ie_tim(beacon);
  	if (ret)
  		return ret;
  
  	/*
  	 * During operation, the firmware takes care of beaconing.
  	 * The driver only needs to upload a new beacon template, once
  	 * the template was changed by the stack or userspace.
  	 *
  	 * LMAC API 3.2.2 also specifies that the driver does not need
  	 * to cancel the old beacon template by hand, instead the firmware
  	 * will release the previous one through the feedback mechanism.
  	 */
  	p54_tx_80211(priv->hw, beacon);
  	priv->tsf_high32 = 0;
  	priv->tsf_low32 = 0;
  
  	return 0;
  }
  
  static int p54_start(struct ieee80211_hw *dev)
  {
  	struct p54_common *priv = dev->priv;
  	int err;
  
  	mutex_lock(&priv->conf_mutex);
  	err = priv->open(dev);
  	if (err)
  		goto out;
  	P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
  	P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
  	P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
  	P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
  	err = p54_set_edcf(priv);
  	if (err)
  		goto out;
  
  	memset(priv->bssid, ~0, ETH_ALEN);
  	priv->mode = NL80211_IFTYPE_MONITOR;
  	err = p54_setup_mac(priv);
  	if (err) {
  		priv->mode = NL80211_IFTYPE_UNSPECIFIED;
  		goto out;
  	}
  
  	ieee80211_queue_delayed_work(dev, &priv->work, 0);
  
  	priv->softled_state = 0;
  	err = p54_set_leds(priv);
  
  out:
  	mutex_unlock(&priv->conf_mutex);
  	return err;
  }
  
  static void p54_stop(struct ieee80211_hw *dev)
  {
  	struct p54_common *priv = dev->priv;
  	int i;
  
  	priv->mode = NL80211_IFTYPE_UNSPECIFIED;
  	priv->softled_state = 0;
  	cancel_delayed_work_sync(&priv->work);
  	mutex_lock(&priv->conf_mutex);
  	p54_set_leds(priv);
  	priv->stop(dev);
  	skb_queue_purge(&priv->tx_pending);
  	skb_queue_purge(&priv->tx_queue);
  	for (i = 0; i < P54_QUEUE_NUM; i++) {
  		priv->tx_stats[i].count = 0;
  		priv->tx_stats[i].len = 0;
  	}
  
  	priv->beacon_req_id = cpu_to_le32(0);
  	priv->tsf_high32 = priv->tsf_low32 = 0;
  	mutex_unlock(&priv->conf_mutex);
  }
  
  static int p54_add_interface(struct ieee80211_hw *dev,
  			     struct ieee80211_vif *vif)
  {
  	struct p54_common *priv = dev->priv;
  
  	mutex_lock(&priv->conf_mutex);
  	if (priv->mode != NL80211_IFTYPE_MONITOR) {
  		mutex_unlock(&priv->conf_mutex);
  		return -EOPNOTSUPP;
  	}
  
  	priv->vif = vif;
  
  	switch (vif->type) {
  	case NL80211_IFTYPE_STATION:
  	case NL80211_IFTYPE_ADHOC:
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_MESH_POINT:
  		priv->mode = vif->type;
  		break;
  	default:
  		mutex_unlock(&priv->conf_mutex);
  		return -EOPNOTSUPP;
  	}
  
  	memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
  	p54_setup_mac(priv);
  	mutex_unlock(&priv->conf_mutex);
  	return 0;
  }
  
  static void p54_remove_interface(struct ieee80211_hw *dev,
  				 struct ieee80211_vif *vif)
  {
  	struct p54_common *priv = dev->priv;
  
  	mutex_lock(&priv->conf_mutex);
  	priv->vif = NULL;
  
  	/*
  	 * LMAC API 3.2.2 states that any active beacon template must be
  	 * canceled by the driver before attempting a mode transition.
  	 */
  	if (le32_to_cpu(priv->beacon_req_id) != 0) {
  		p54_tx_cancel(priv, priv->beacon_req_id);
  		wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
  	}
  	priv->mode = NL80211_IFTYPE_MONITOR;
  	memset(priv->mac_addr, 0, ETH_ALEN);
  	memset(priv->bssid, 0, ETH_ALEN);
  	p54_setup_mac(priv);
  	mutex_unlock(&priv->conf_mutex);
  }
  
  static int p54_wait_for_stats(struct ieee80211_hw *dev)
  {
  	struct p54_common *priv = dev->priv;
  	int ret;
  
  	priv->update_stats = true;
  	ret = p54_fetch_statistics(priv);
  	if (ret)
  		return ret;
  
  	ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
  	if (ret == 0)
  		return -ETIMEDOUT;
  
  	return 0;
  }
  
  static void p54_reset_stats(struct p54_common *priv)
  {
  	struct ieee80211_channel *chan = priv->curchan;
  
  	if (chan) {
  		struct survey_info *info = &priv->survey[chan->hw_value];
  
  		/* only reset channel statistics, don't touch .filled, etc. */
  		info->channel_time = 0;
  		info->channel_time_busy = 0;
  		info->channel_time_tx = 0;
  	}
  
  	priv->update_stats = true;
  	priv->survey_raw.active = 0;
  	priv->survey_raw.cca = 0;
  	priv->survey_raw.tx = 0;
  }
  
  static int p54_config(struct ieee80211_hw *dev, u32 changed)
  {
  	int ret = 0;
  	struct p54_common *priv = dev->priv;
  	struct ieee80211_conf *conf = &dev->conf;
  
  	mutex_lock(&priv->conf_mutex);
  	if (changed & IEEE80211_CONF_CHANGE_POWER)
  		priv->output_power = conf->power_level << 2;
  	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
  		struct ieee80211_channel *oldchan;
  		WARN_ON(p54_wait_for_stats(dev));
  		oldchan = priv->curchan;
  		priv->curchan = NULL;
  		ret = p54_scan(priv, P54_SCAN_EXIT, 0);
  		if (ret) {
  			priv->curchan = oldchan;
  			goto out;
  		}
  		/*
  		 * TODO: Use the LM_SCAN_TRAP to determine the current
  		 * operating channel.
  		 */
  		priv->curchan = priv->hw->conf.channel;
  		p54_reset_stats(priv);
  		WARN_ON(p54_fetch_statistics(priv));
  	}
  	if (changed & IEEE80211_CONF_CHANGE_PS) {
  		WARN_ON(p54_wait_for_stats(dev));
  		ret = p54_set_ps(priv);
  		if (ret)
  			goto out;
  		WARN_ON(p54_wait_for_stats(dev));
  	}
  	if (changed & IEEE80211_CONF_CHANGE_IDLE) {
  		WARN_ON(p54_wait_for_stats(dev));
  		ret = p54_setup_mac(priv);
  		if (ret)
  			goto out;
  		WARN_ON(p54_wait_for_stats(dev));
  	}
  
  out:
  	mutex_unlock(&priv->conf_mutex);
  	return ret;
  }
  
  #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
  				 struct netdev_hw_addr_list *mc_list)
  #else
  static u64 p54_prepare_multicast(struct ieee80211_hw *dev, int mc_count,
  				 struct dev_addr_list *ha)
  #endif
  {
  	struct p54_common *priv = dev->priv;
  #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  	struct netdev_hw_addr *ha;
  #endif
  	int i;
  
  	BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
  		ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
  	/*
  	 * The first entry is reserved for the global broadcast MAC.
  	 * Otherwise the firmware will drop it and ARP will no longer work.
  	 */
  	i = 1;
  #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
  	priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
  	netdev_hw_addr_list_for_each(ha, mc_list) {
  		memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
  #else
  	priv->mc_maclist_num = mc_count + i;
  	while (i <= mc_count) {
  		if (!ha)
  			break;
  		memcpy(&priv->mc_maclist[i], ha->dmi_addr, ETH_ALEN);
  #endif
  		i++;
  		if (i >= ARRAY_SIZE(priv->mc_maclist))
  			break;
  #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35))
  		ha = ha->next;
  #endif
  	}
  
  	return 1; /* update */
  }
  
  static void p54_configure_filter(struct ieee80211_hw *dev,
  				 unsigned int changed_flags,
  				 unsigned int *total_flags,
  				 u64 multicast)
  {
  	struct p54_common *priv = dev->priv;
  
  	*total_flags &= FIF_PROMISC_IN_BSS |
  			FIF_ALLMULTI |
  			FIF_OTHER_BSS;
  
  	priv->filter_flags = *total_flags;
  
  	if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS))
  		p54_setup_mac(priv);
  
  	if (changed_flags & FIF_ALLMULTI || multicast)
  		p54_set_groupfilter(priv);
  }
  
  static int p54_conf_tx(struct ieee80211_hw *dev,
  		       struct ieee80211_vif *vif, u16 queue,
  		       const struct ieee80211_tx_queue_params *params)
  {
  	struct p54_common *priv = dev->priv;
  	int ret;
  
  	mutex_lock(&priv->conf_mutex);
  	if (queue < dev->queues) {
  		P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
  			params->cw_min, params->cw_max, params->txop);
  		ret = p54_set_edcf(priv);
  	} else
  		ret = -EINVAL;
  	mutex_unlock(&priv->conf_mutex);
  	return ret;
  }
  
  static void p54_work(struct work_struct *work)
  {
  	struct p54_common *priv = container_of(work, struct p54_common,
  					       work.work);
  
  	if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
  		return ;
  
  	/*
  	 * TODO: walk through tx_queue and do the following tasks
  	 * 	1. initiate bursts.
  	 *      2. cancel stuck frames / reset the device if necessary.
  	 */
  
  	mutex_lock(&priv->conf_mutex);
  	WARN_ON_ONCE(p54_fetch_statistics(priv));
  	mutex_unlock(&priv->conf_mutex);
  }
  
  static int p54_get_stats(struct ieee80211_hw *dev,
  			 struct ieee80211_low_level_stats *stats)
  {
  	struct p54_common *priv = dev->priv;
  
  	memcpy(stats, &priv->stats, sizeof(*stats));
  	return 0;
  }
  
  static void p54_bss_info_changed(struct ieee80211_hw *dev,
  				 struct ieee80211_vif *vif,
  				 struct ieee80211_bss_conf *info,
  				 u32 changed)
  {
  	struct p54_common *priv = dev->priv;
  
  	mutex_lock(&priv->conf_mutex);
  	if (changed & BSS_CHANGED_BSSID) {
  		memcpy(priv->bssid, info->bssid, ETH_ALEN);
  		p54_setup_mac(priv);
  	}
  
  	if (changed & BSS_CHANGED_BEACON) {
  		p54_scan(priv, P54_SCAN_EXIT, 0);
  		p54_setup_mac(priv);
  		p54_beacon_update(priv, vif);
  		p54_set_edcf(priv);
  	}
  
  	if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
  		priv->use_short_slot = info->use_short_slot;
  		p54_set_edcf(priv);
  	}
  	if (changed & BSS_CHANGED_BASIC_RATES) {
  		if (dev->conf.channel->band == IEEE80211_BAND_5GHZ)
  			priv->basic_rate_mask = (info->basic_rates << 4);
  		else
  			priv->basic_rate_mask = info->basic_rates;
  		p54_setup_mac(priv);
  		if (priv->fw_var >= 0x500)
  			p54_scan(priv, P54_SCAN_EXIT, 0);
  	}
  	if (changed & BSS_CHANGED_ASSOC) {
  		if (info->assoc) {
  			priv->aid = info->aid;
  			priv->wakeup_timer = info->beacon_int *
  					     info->dtim_period * 5;
  			p54_setup_mac(priv);
  		} else {
  			priv->wakeup_timer = 500;
  			priv->aid = 0;
  		}
  	}
  
  	mutex_unlock(&priv->conf_mutex);
  }
  
  static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
  		       struct ieee80211_vif *vif, struct ieee80211_sta *sta,
  		       struct ieee80211_key_conf *key)
  {
  	struct p54_common *priv = dev->priv;
  	int slot, ret = 0;
  	u8 algo = 0;
  	u8 *addr = NULL;
  
  	if (modparam_nohwcrypt)
  		return -EOPNOTSUPP;
  
  	mutex_lock(&priv->conf_mutex);
  	if (cmd == SET_KEY) {
  		switch (key->cipher) {
  		case WLAN_CIPHER_SUITE_TKIP:
  			if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
  			      BR_DESC_PRIV_CAP_TKIP))) {
  				ret = -EOPNOTSUPP;
  				goto out_unlock;
  			}
  			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
  			algo = P54_CRYPTO_TKIPMICHAEL;
  			break;
  		case WLAN_CIPHER_SUITE_WEP40:
  		case WLAN_CIPHER_SUITE_WEP104:
  			if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
  				ret = -EOPNOTSUPP;
  				goto out_unlock;
  			}
  			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
  			algo = P54_CRYPTO_WEP;
  			break;
  		case WLAN_CIPHER_SUITE_CCMP:
  			if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
  				ret = -EOPNOTSUPP;
  				goto out_unlock;
  			}
  			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
  			algo = P54_CRYPTO_AESCCMP;
  			break;
  		default:
  			ret = -EOPNOTSUPP;
  			goto out_unlock;
  		}
  		slot = bitmap_find_free_region(priv->used_rxkeys,
  					       priv->rx_keycache_size, 0);
  
  		if (slot < 0) {
  			/*
  			 * The device supports the chosen algorithm, but the
  			 * firmware does not provide enough key slots to store
  			 * all of them.
  			 * But encryption offload for outgoing frames is always
  			 * possible, so we just pretend that the upload was
  			 * successful and do the decryption in software.
  			 */
  
  			/* mark the key as invalid. */
  			key->hw_key_idx = 0xff;
  			goto out_unlock;
  		}
  	} else {
  		slot = key->hw_key_idx;
  
  		if (slot == 0xff) {
  			/* This key was not uploaded into the rx key cache. */
  
  			goto out_unlock;
  		}
  
  		bitmap_release_region(priv->used_rxkeys, slot, 0);
  		algo = 0;
  	}
  
  	if (sta)
  		addr = sta->addr;
  
  	ret = p54_upload_key(priv, algo, slot, key->keyidx,
  			     key->keylen, addr, key->key);
  	if (ret) {
  		bitmap_release_region(priv->used_rxkeys, slot, 0);
  		ret = -EOPNOTSUPP;
  		goto out_unlock;
  	}
  
  	key->hw_key_idx = slot;
  
  out_unlock:
  	mutex_unlock(&priv->conf_mutex);
  	return ret;
  }
  
  static int p54_get_survey(struct ieee80211_hw *dev, int idx,
  				struct survey_info *survey)
  {
  	struct p54_common *priv = dev->priv;
  	struct ieee80211_channel *chan;
  	int err, tries;
  	bool in_use = false;
  
  	if (idx >= priv->chan_num)
  		return -ENOENT;
  
  #define MAX_TRIES 1
  	for (tries = 0; tries < MAX_TRIES; tries++) {
  		chan = priv->curchan;
  		if (chan && chan->hw_value == idx) {
  			mutex_lock(&priv->conf_mutex);
  			err = p54_wait_for_stats(dev);
  			mutex_unlock(&priv->conf_mutex);
  			if (err)
  				return err;
  
  			in_use = true;
  		}
  
  		memcpy(survey, &priv->survey[idx], sizeof(*survey));
  
  		if (in_use) {
  			/* test if the reported statistics are valid. */
  			if  (survey->channel_time != 0) {
  				survey->filled |= SURVEY_INFO_IN_USE;
  			} else {
  				/*
  				 * hw/fw has not accumulated enough sample sets.
  				 * Wait for 100ms, this ought to be enough to
  				 * to get at least one non-null set of channel
  				 * usage statistics.
  				 */
  				msleep(100);
  				continue;
  			}
  		}
  		return 0;
  	}
  	return -ETIMEDOUT;
  #undef MAX_TRIES
  }
  
  static unsigned int p54_flush_count(struct p54_common *priv)
  {
  	unsigned int total = 0, i;
  
  	BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
  
  	/*
  	 * Because the firmware has the sole control over any frames
  	 * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
  	 * don't really count as pending or active.
  	 */
  	for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
  		total += priv->tx_stats[i].len;
  	return total;
  }
  
  static void p54_flush(struct ieee80211_hw *dev, bool drop)
  {
  	struct p54_common *priv = dev->priv;
  	unsigned int total, i;
  
  	/*
  	 * Currently, it wouldn't really matter if we wait for one second
  	 * or 15 minutes. But once someone gets around and completes the
  	 * TODOs [ancel stuck frames / reset device] in p54_work, it will
  	 * suddenly make sense to wait that long.
  	 */
  	i = P54_STATISTICS_UPDATE * 2 / 20;
  
  	/*
  	 * In this case no locking is required because as we speak the
  	 * queues have already been stopped and no new frames can sneak
  	 * up from behind.
  	 */
  	while ((total = p54_flush_count(priv) && i--)) {
  		/* waste time */
  		msleep(20);
  	}
  
  	WARN(total, "tx flush timeout, unresponsive firmware");
  }
  
  static void p54_set_coverage_class(struct ieee80211_hw *dev, u8 coverage_class)
  {
  	struct p54_common *priv = dev->priv;
  
  	mutex_lock(&priv->conf_mutex);
  	/* support all coverage class values as in 802.11-2007 Table 7-27 */
  	priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
  	p54_set_edcf(priv);
  	mutex_unlock(&priv->conf_mutex);
  }
  
  static const struct ieee80211_ops p54_ops = {
  	.tx			= p54_tx_80211,
  	.start			= p54_start,
  	.stop			= p54_stop,
  	.add_interface		= p54_add_interface,
  	.remove_interface	= p54_remove_interface,
  	.set_tim		= p54_set_tim,
  	.sta_notify		= p54_sta_notify,
  	.sta_add		= p54_sta_add_remove,
  	.sta_remove		= p54_sta_add_remove,
  	.set_key		= p54_set_key,
  	.config			= p54_config,
  	.flush			= p54_flush,
  	.bss_info_changed	= p54_bss_info_changed,
  	.prepare_multicast	= p54_prepare_multicast,
  	.configure_filter	= p54_configure_filter,
  	.conf_tx		= p54_conf_tx,
  	.get_stats		= p54_get_stats,
  	.get_survey		= p54_get_survey,
  	.set_coverage_class	= p54_set_coverage_class,
  };
  
  struct ieee80211_hw *p54_init_common(size_t priv_data_len)
  {
  	struct ieee80211_hw *dev;
  	struct p54_common *priv;
  
  	dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
  	if (!dev)
  		return NULL;
  
  	priv = dev->priv;
  	priv->hw = dev;
  	priv->mode = NL80211_IFTYPE_UNSPECIFIED;
  	priv->basic_rate_mask = 0x15f;
  	spin_lock_init(&priv->tx_stats_lock);
  	skb_queue_head_init(&priv->tx_queue);
  	skb_queue_head_init(&priv->tx_pending);
  	dev->flags = IEEE80211_HW_RX_INCLUDES_FCS |
  		     IEEE80211_HW_SIGNAL_DBM |
  		     IEEE80211_HW_SUPPORTS_PS |
  		     IEEE80211_HW_PS_NULLFUNC_STACK |
  		     IEEE80211_HW_BEACON_FILTER |
  		     IEEE80211_HW_REPORTS_TX_ACK_STATUS;
  
  	dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
  				      BIT(NL80211_IFTYPE_ADHOC) |
  				      BIT(NL80211_IFTYPE_AP) |
  				      BIT(NL80211_IFTYPE_MESH_POINT);
  
  	dev->channel_change_time = 1000;	/* TODO: find actual value */
  	priv->beacon_req_id = cpu_to_le32(0);
  	priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
  	priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
  	priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
  	priv->tx_stats[P54_QUEUE_CAB].limit = 3;
  	priv->tx_stats[P54_QUEUE_DATA].limit = 5;
  	dev->queues = 1;
  	priv->noise = -94;
  	/*
  	 * We support at most 8 tries no matter which rate they're at,
  	 * we cannot support max_rates * max_rate_tries as we set it
  	 * here, but setting it correctly to 4/2 or so would limit us
  	 * artificially if the RC algorithm wants just two rates, so
  	 * let's say 4/7, we'll redistribute it at TX time, see the
  	 * comments there.
  	 */
  	dev->max_rates = 4;
  	dev->max_rate_tries = 7;
  	dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
  				 sizeof(struct p54_tx_data);
  
  	/*
  	 * For now, disable PS by default because it affects
  	 * link stability significantly.
  	 */
  	dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
  
  	mutex_init(&priv->conf_mutex);
  	mutex_init(&priv->eeprom_mutex);
  	init_completion(&priv->stat_comp);
  	init_completion(&priv->eeprom_comp);
  	init_completion(&priv->beacon_comp);
  	INIT_DELAYED_WORK(&priv->work, p54_work);
  
  	memset(&priv->mc_maclist[0], ~0, ETH_ALEN);
  	priv->curchan = NULL;
  	p54_reset_stats(priv);
  	return dev;
  }
  EXPORT_SYMBOL_GPL(p54_init_common);
  
  int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
  {
  	struct p54_common __maybe_unused *priv = dev->priv;
  	int err;
  
  	err = ieee80211_register_hw(dev);
  	if (err) {
  		dev_err(pdev, "Cannot register device (%d).\n", err);
  		return err;
  	}
  
  #ifdef CONFIG_P54_LEDS
  	err = p54_init_leds(priv);
  	if (err)
  		return err;
  #endif /* CONFIG_P54_LEDS */
  
  	dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
  	return 0;
  }
  EXPORT_SYMBOL_GPL(p54_register_common);
  
  void p54_free_common(struct ieee80211_hw *dev)
  {
  	struct p54_common *priv = dev->priv;
  	unsigned int i;
  
  	for (i = 0; i < IEEE80211_NUM_BANDS; i++)
  		kfree(priv->band_table[i]);
  
  	kfree(priv->iq_autocal);
  	kfree(priv->output_limit);
  	kfree(priv->curve_data);
  	kfree(priv->rssi_db);
  	kfree(priv->used_rxkeys);
  	kfree(priv->survey);
  	priv->iq_autocal = NULL;
  	priv->output_limit = NULL;
  	priv->curve_data = NULL;
  	priv->rssi_db = NULL;
  	priv->used_rxkeys = NULL;
  	priv->survey = NULL;
  	ieee80211_free_hw(dev);
  }
  EXPORT_SYMBOL_GPL(p54_free_common);
  
  void p54_unregister_common(struct ieee80211_hw *dev)
  {
  	struct p54_common *priv = dev->priv;
  
  #ifdef CONFIG_P54_LEDS
  	p54_unregister_leds(priv);
  #endif /* CONFIG_P54_LEDS */
  
  	ieee80211_unregister_hw(dev);
  	mutex_destroy(&priv->conf_mutex);
  	mutex_destroy(&priv->eeprom_mutex);
  }
  EXPORT_SYMBOL_GPL(p54_unregister_common);
  