// SPDX-License-Identifier: GPL-2.0-or-later
/*
        Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
        <http://rt2x00.serialmonkey.com>

 */

/*
        Module: rt2x00lib
        Abstract: rt2x00 generic configuration routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "rt2x00.h"
#include "rt2x00lib.h"

void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
                           struct rt2x00_intf *intf,
                           enum nl80211_iftype type,
                           const u8 *mac, const u8 *bssid)
{
        struct rt2x00intf_conf conf;
        unsigned int flags = 0;

        conf.type = type;

        switch (type) {
        case NL80211_IFTYPE_ADHOC:
                conf.sync = TSF_SYNC_ADHOC;
                break;
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_MESH_POINT:
                conf.sync = TSF_SYNC_AP_NONE;
                break;
        case NL80211_IFTYPE_STATION:
                conf.sync = TSF_SYNC_INFRA;
                break;
        default:
                conf.sync = TSF_SYNC_NONE;
                break;
        }

        /*
         * Note that when NULL is passed as address we will send
         * 00:00:00:00:00 to the device to clear the address.
         * This will prevent the device being confused when it wants
         * to ACK frames or considers itself associated.
         */
        memset(conf.mac, 0, sizeof(conf.mac));
        if (mac)
                memcpy(conf.mac, mac, ETH_ALEN);

        memset(conf.bssid, 0, sizeof(conf.bssid));
        if (bssid)
                memcpy(conf.bssid, bssid, ETH_ALEN);

        flags |= CONFIG_UPDATE_TYPE;
        if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
                flags |= CONFIG_UPDATE_MAC;
        if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
                flags |= CONFIG_UPDATE_BSSID;

        rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
}

void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
                          struct rt2x00_intf *intf,
                          struct ieee80211_bss_conf *bss_conf,
                          u32 changed)
{
        struct rt2x00lib_erp erp;

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

        erp.short_preamble = bss_conf->use_short_preamble;
        erp.cts_protection = bss_conf->use_cts_prot;

        erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
        erp.sifs = SIFS;
        erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
        erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
        erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;

        erp.basic_rates = bss_conf->basic_rates;
        erp.beacon_int = bss_conf->beacon_int;

        /* Update the AID, this is needed for dynamic PS support */
        rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
        rt2x00dev->last_beacon = bss_conf->sync_tsf;

        /* Update global beacon interval time, this is needed for PS support */
        rt2x00dev->beacon_int = bss_conf->beacon_int;

        if (changed & BSS_CHANGED_HT)
                erp.ht_opmode = bss_conf->ht_operation_mode;

        rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
}

void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
                              struct antenna_setup config)
{
        struct link_ant *ant = &rt2x00dev->link.ant;
        struct antenna_setup *def = &rt2x00dev->default_ant;
        struct antenna_setup *active = &rt2x00dev->link.ant.active;

        /*
         * When the caller tries to send the SW diversity,
         * we must update the ANTENNA_RX_DIVERSITY flag to
         * enable the antenna diversity in the link tuner.
         *
         * Secondly, we must guarentee we never send the
         * software antenna diversity command to the driver.
         */
        if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
                if (config.rx == ANTENNA_SW_DIVERSITY) {
                        ant->flags |= ANTENNA_RX_DIVERSITY;

                        if (def->rx == ANTENNA_SW_DIVERSITY)
                                config.rx = ANTENNA_B;
                        else
                                config.rx = def->rx;
                }
        } else if (config.rx == ANTENNA_SW_DIVERSITY)
                config.rx = active->rx;

        if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
                if (config.tx == ANTENNA_SW_DIVERSITY) {
                        ant->flags |= ANTENNA_TX_DIVERSITY;

                        if (def->tx == ANTENNA_SW_DIVERSITY)
                                config.tx = ANTENNA_B;
                        else
                                config.tx = def->tx;
                }
        } else if (config.tx == ANTENNA_SW_DIVERSITY)
                config.tx = active->tx;

        /*
         * Antenna setup changes require the RX to be disabled,
         * else the changes will be ignored by the device.
         */
        if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
                rt2x00queue_stop_queue(rt2x00dev->rx);

        /*
         * Write new antenna setup to device and reset the link tuner.
         * The latter is required since we need to recalibrate the
         * noise-sensitivity ratio for the new setup.
         */
        rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);

        rt2x00link_reset_tuner(rt2x00dev, true);

        memcpy(active, &config, sizeof(config));

        if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
                rt2x00queue_start_queue(rt2x00dev->rx);
}

static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
                                   struct ieee80211_conf *conf)
{
        struct hw_mode_spec *spec = &rt2x00dev->spec;
        int center_channel;
        u16 i;

        /*
         * Initialize center channel to current channel.
         */
        center_channel = spec->channels[conf->chandef.chan->hw_value].channel;

        /*
         * Adjust center channel to HT40+ and HT40- operation.
         */
        if (conf_is_ht40_plus(conf))
                center_channel += 2;
        else if (conf_is_ht40_minus(conf))
                center_channel -= (center_channel == 14) ? 1 : 2;

        for (i = 0; i < spec->num_channels; i++)
                if (spec->channels[i].channel == center_channel)
                        return i;

        WARN_ON(1);
        return conf->chandef.chan->hw_value;
}

void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
                      struct ieee80211_conf *conf,
                      unsigned int ieee80211_flags)
{
        struct rt2x00lib_conf libconf;
        u16 hw_value;
        u16 autowake_timeout;
        u16 beacon_int;
        u16 beacon_diff;

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

        libconf.conf = conf;

        if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
                if (!conf_is_ht(conf))
                        set_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
                else
                        clear_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);

                if (conf_is_ht40(conf)) {
                        set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
                        hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
                } else {
                        clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
                        hw_value = conf->chandef.chan->hw_value;
                }

                memcpy(&libconf.rf,
                       &rt2x00dev->spec.channels[hw_value],
                       sizeof(libconf.rf));

                memcpy(&libconf.channel,
                       &rt2x00dev->spec.channels_info[hw_value],
                       sizeof(libconf.channel));

                /* Used for VCO periodic calibration */
                rt2x00dev->rf_channel = libconf.rf.channel;
        }

        if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
            (ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
                cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);

        /*
         * Start configuration.
         */
        rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);

        if (conf->flags & IEEE80211_CONF_PS)
                set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
        else
                clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);

        if (conf->flags & IEEE80211_CONF_MONITOR)
                set_bit(CONFIG_MONITORING, &rt2x00dev->flags);
        else
                clear_bit(CONFIG_MONITORING, &rt2x00dev->flags);

        rt2x00dev->curr_band = conf->chandef.chan->band;
        rt2x00dev->curr_freq = conf->chandef.chan->center_freq;
        rt2x00dev->tx_power = conf->power_level;
        rt2x00dev->short_retry = conf->short_frame_max_tx_count;
        rt2x00dev->long_retry = conf->long_frame_max_tx_count;

        /*
         * Some configuration changes affect the link quality
         * which means we need to reset the link tuner.
         */
        if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
                rt2x00link_reset_tuner(rt2x00dev, false);

        if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
            rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
            (ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
            (conf->flags & IEEE80211_CONF_PS)) {
                beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
                beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);

                if (beacon_diff > beacon_int)
                        beacon_diff = 0;

                autowake_timeout = (conf->ps_dtim_period * beacon_int) - beacon_diff;
                queue_delayed_work(rt2x00dev->workqueue,
                                   &rt2x00dev->autowakeup_work,
                                   autowake_timeout - 15);
        }
}