WIP FPC-III support

[linux/fpc-iii.git] / drivers / net / wireless / intersil / p54 / main.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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).
 */

#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 bool modparam_nohwcrypt;
module_param_named(nohwcrypt, modparam_nohwcrypt, bool, 0444);
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 ieee80211_tx_control control = { };
        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, &control, 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;

        eth_broadcast_addr(priv->bssid);
        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;
        int err;

        vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;

        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);
        err = p54_setup_mac(priv);
        mutex_unlock(&priv->conf_mutex);
        return err;
}

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;
        eth_zero_addr(priv->mac_addr);
        eth_zero_addr(priv->bssid);
        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->time = 0;
                info->time_busy = 0;
                info->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.chandef.chan;
                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;
}

static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
                                 struct netdev_hw_addr_list *mc_list)
{
        struct p54_common *priv = dev->priv;
        struct netdev_hw_addr *ha;
        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;
        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);
                i++;
                if (i >= ARRAY_SIZE(priv->mc_maclist))
                        break;
        }

        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_ALLMULTI | FIF_OTHER_BSS;

        priv->filter_flags = *total_flags;

        if (changed_flags & 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);
        P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
                      params->cw_min, params->cw_max, params->txop);
        ret = p54_set_edcf(priv);
        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.chandef.chan->band == NL80211_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;

        if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
                /*
                 * Unfortunately most/all firmwares are trying to decrypt
                 * incoming management frames if a suitable key can be found.
                 * However, in doing so the data in these frames gets
                 * corrupted. So, we can't have firmware supported crypto
                 * offload in this case.
                 */
                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;
                }

                key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
        } 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->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, struct ieee80211_vif *vif,
                      u32 queues, 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,
                                   s16 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);
        ieee80211_hw_set(dev, REPORTS_TX_ACK_STATUS);
        ieee80211_hw_set(dev, MFP_CAPABLE);
        ieee80211_hw_set(dev, PS_NULLFUNC_STACK);
        ieee80211_hw_set(dev, SUPPORTS_PS);
        ieee80211_hw_set(dev, RX_INCLUDES_FCS);
        ieee80211_hw_set(dev, SIGNAL_DBM);

        dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
                                      BIT(NL80211_IFTYPE_ADHOC) |
                                      BIT(NL80211_IFTYPE_AP) |
                                      BIT(NL80211_IFTYPE_MESH_POINT);

        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);

        eth_broadcast_addr(priv->mc_maclist[0]);
        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;
        }
        priv->registered = true;

#ifdef CONFIG_P54_LEDS
        err = p54_init_leds(priv);
        if (err) {
                p54_unregister_common(dev);
                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 < NUM_NL80211_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;

        if (priv->registered) {
                priv->registered = false;
#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);