Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

[linux-btrfs-devel.git] / drivers / net / wireless / iwlwifi / iwl-agn-lib.c

/******************************************************************************
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>

#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-agn-hw.h"
#include "iwl-agn.h"
#include "iwl-trans.h"
#include "iwl-shared.h"

int iwlagn_hw_valid_rtc_data_addr(u32 addr)
{
        return (addr >= IWLAGN_RTC_DATA_LOWER_BOUND) &&
                (addr < IWLAGN_RTC_DATA_UPPER_BOUND);
}

int iwlagn_send_tx_power(struct iwl_priv *priv)
{
        struct iwlagn_tx_power_dbm_cmd tx_power_cmd;
        u8 tx_ant_cfg_cmd;

        if (WARN_ONCE(test_bit(STATUS_SCAN_HW, &priv->shrd->status),
                      "TX Power requested while scanning!\n"))
                return -EAGAIN;

        /* half dBm need to multiply */
        tx_power_cmd.global_lmt = (s8)(2 * priv->tx_power_user_lmt);

        if (priv->tx_power_lmt_in_half_dbm &&
            priv->tx_power_lmt_in_half_dbm < tx_power_cmd.global_lmt) {
                /*
                 * For the newer devices which using enhanced/extend tx power
                 * table in EEPROM, the format is in half dBm. driver need to
                 * convert to dBm format before report to mac80211.
                 * By doing so, there is a possibility of 1/2 dBm resolution
                 * lost. driver will perform "round-up" operation before
                 * reporting, but it will cause 1/2 dBm tx power over the
                 * regulatory limit. Perform the checking here, if the
                 * "tx_power_user_lmt" is higher than EEPROM value (in
                 * half-dBm format), lower the tx power based on EEPROM
                 */
                tx_power_cmd.global_lmt = priv->tx_power_lmt_in_half_dbm;
        }
        tx_power_cmd.flags = IWLAGN_TX_POWER_NO_CLOSED;
        tx_power_cmd.srv_chan_lmt = IWLAGN_TX_POWER_AUTO;

        if (IWL_UCODE_API(priv->ucode_ver) == 1)
                tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD_V1;
        else
                tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD;

        return iwl_trans_send_cmd_pdu(trans(priv), tx_ant_cfg_cmd, CMD_SYNC,
                        sizeof(tx_power_cmd), &tx_power_cmd);
}

void iwlagn_temperature(struct iwl_priv *priv)
{
        /* store temperature from correct statistics (in Celsius) */
        priv->temperature = le32_to_cpu(priv->statistics.common.temperature);
        iwl_tt_handler(priv);
}

u16 iwlagn_eeprom_calib_version(struct iwl_priv *priv)
{
        struct iwl_eeprom_calib_hdr *hdr;

        hdr = (struct iwl_eeprom_calib_hdr *)iwl_eeprom_query_addr(priv,
                                                        EEPROM_CALIB_ALL);
        return hdr->version;

}

/*
 * EEPROM
 */
static u32 eeprom_indirect_address(const struct iwl_priv *priv, u32 address)
{
        u16 offset = 0;

        if ((address & INDIRECT_ADDRESS) == 0)
                return address;

        switch (address & INDIRECT_TYPE_MSK) {
        case INDIRECT_HOST:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_HOST);
                break;
        case INDIRECT_GENERAL:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_GENERAL);
                break;
        case INDIRECT_REGULATORY:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_REGULATORY);
                break;
        case INDIRECT_TXP_LIMIT:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_TXP_LIMIT);
                break;
        case INDIRECT_TXP_LIMIT_SIZE:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_TXP_LIMIT_SIZE);
                break;
        case INDIRECT_CALIBRATION:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_CALIBRATION);
                break;
        case INDIRECT_PROCESS_ADJST:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_PROCESS_ADJST);
                break;
        case INDIRECT_OTHERS:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_OTHERS);
                break;
        default:
                IWL_ERR(priv, "illegal indirect type: 0x%X\n",
                address & INDIRECT_TYPE_MSK);
                break;
        }

        /* translate the offset from words to byte */
        return (address & ADDRESS_MSK) + (offset << 1);
}

const u8 *iwl_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
{
        u32 address = eeprom_indirect_address(priv, offset);
        BUG_ON(address >= priv->cfg->base_params->eeprom_size);
        return &priv->eeprom[address];
}

struct iwl_mod_params iwlagn_mod_params = {
        .amsdu_size_8K = 1,
        .restart_fw = 1,
        .plcp_check = true,
        .bt_coex_active = true,
        .no_sleep_autoadjust = true,
        .power_level = IWL_POWER_INDEX_1,
        .bt_ch_announce = true,
        .wanted_ucode_alternative = 1,
        .auto_agg = true,
        /* the rest are 0 by default */
};

int iwlagn_hwrate_to_mac80211_idx(u32 rate_n_flags, enum ieee80211_band band)
{
        int idx = 0;
        int band_offset = 0;

        /* HT rate format: mac80211 wants an MCS number, which is just LSB */
        if (rate_n_flags & RATE_MCS_HT_MSK) {
                idx = (rate_n_flags & 0xff);
                return idx;
        /* Legacy rate format, search for match in table */
        } else {
                if (band == IEEE80211_BAND_5GHZ)
                        band_offset = IWL_FIRST_OFDM_RATE;
                for (idx = band_offset; idx < IWL_RATE_COUNT_LEGACY; idx++)
                        if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF))
                                return idx - band_offset;
        }

        return -1;
}

int iwlagn_manage_ibss_station(struct iwl_priv *priv,
                               struct ieee80211_vif *vif, bool add)
{
        struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;

        if (add)
                return iwlagn_add_bssid_station(priv, vif_priv->ctx,
                                                vif->bss_conf.bssid,
                                                &vif_priv->ibss_bssid_sta_id);
        return iwl_remove_station(priv, vif_priv->ibss_bssid_sta_id,
                                  vif->bss_conf.bssid);
}

/**
 * iwlagn_txfifo_flush: send REPLY_TXFIFO_FLUSH command to uCode
 *
 * pre-requirements:
 *  1. acquire mutex before calling
 *  2. make sure rf is on and not in exit state
 */
int iwlagn_txfifo_flush(struct iwl_priv *priv, u16 flush_control)
{
        struct iwl_txfifo_flush_cmd flush_cmd;
        struct iwl_host_cmd cmd = {
                .id = REPLY_TXFIFO_FLUSH,
                .len = { sizeof(struct iwl_txfifo_flush_cmd), },
                .flags = CMD_SYNC,
                .data = { &flush_cmd, },
        };

        might_sleep();

        memset(&flush_cmd, 0, sizeof(flush_cmd));
        if (flush_control & BIT(IWL_RXON_CTX_BSS))
                flush_cmd.fifo_control = IWL_SCD_VO_MSK | IWL_SCD_VI_MSK |
                                 IWL_SCD_BE_MSK | IWL_SCD_BK_MSK |
                                 IWL_SCD_MGMT_MSK;
        if ((flush_control & BIT(IWL_RXON_CTX_PAN)) &&
            (priv->shrd->valid_contexts != BIT(IWL_RXON_CTX_BSS)))
                flush_cmd.fifo_control |= IWL_PAN_SCD_VO_MSK |
                                IWL_PAN_SCD_VI_MSK | IWL_PAN_SCD_BE_MSK |
                                IWL_PAN_SCD_BK_MSK | IWL_PAN_SCD_MGMT_MSK |
                                IWL_PAN_SCD_MULTICAST_MSK;

        if (priv->cfg->sku & EEPROM_SKU_CAP_11N_ENABLE)
                flush_cmd.fifo_control |= IWL_AGG_TX_QUEUE_MSK;

        IWL_DEBUG_INFO(priv, "fifo queue control: 0X%x\n",
                       flush_cmd.fifo_control);
        flush_cmd.flush_control = cpu_to_le16(flush_control);

        return iwl_trans_send_cmd(trans(priv), &cmd);
}

void iwlagn_dev_txfifo_flush(struct iwl_priv *priv, u16 flush_control)
{
        mutex_lock(&priv->shrd->mutex);
        ieee80211_stop_queues(priv->hw);
        if (iwlagn_txfifo_flush(priv, IWL_DROP_ALL)) {
                IWL_ERR(priv, "flush request fail\n");
                goto done;
        }
        IWL_DEBUG_INFO(priv, "wait transmit/flush all frames\n");
        iwl_trans_wait_tx_queue_empty(trans(priv));
done:
        ieee80211_wake_queues(priv->hw);
        mutex_unlock(&priv->shrd->mutex);
}

/*
 * BT coex
 */
/*
 * Macros to access the lookup table.
 *
 * The lookup table has 7 inputs: bt3_prio, bt3_txrx, bt_rf_act, wifi_req,
* wifi_prio, wifi_txrx and wifi_sh_ant_req.
 *
 * It has three outputs: WLAN_ACTIVE, WLAN_KILL and ANT_SWITCH
 *
 * The format is that "registers" 8 through 11 contain the WLAN_ACTIVE bits
 * one after another in 32-bit registers, and "registers" 0 through 7 contain
 * the WLAN_KILL and ANT_SWITCH bits interleaved (in that order).
 *
 * These macros encode that format.
 */
#define LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, wifi_req, wifi_prio, \
                  wifi_txrx, wifi_sh_ant_req) \
        (bt3_prio | (bt3_txrx << 1) | (bt_rf_act << 2) | (wifi_req << 3) | \
        (wifi_prio << 4) | (wifi_txrx << 5) | (wifi_sh_ant_req << 6))

#define LUT_PTA_WLAN_ACTIVE_OP(lut, op, val) \
        lut[8 + ((val) >> 5)] op (cpu_to_le32(BIT((val) & 0x1f)))
#define LUT_TEST_PTA_WLAN_ACTIVE(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                                 wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        (!!(LUT_PTA_WLAN_ACTIVE_OP(lut, &, LUT_VALUE(bt3_prio, bt3_txrx, \
                                   bt_rf_act, wifi_req, wifi_prio, wifi_txrx, \
                                   wifi_sh_ant_req))))
#define LUT_SET_PTA_WLAN_ACTIVE(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                                wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        LUT_PTA_WLAN_ACTIVE_OP(lut, |=, LUT_VALUE(bt3_prio, bt3_txrx, \
                               bt_rf_act, wifi_req, wifi_prio, wifi_txrx, \
                               wifi_sh_ant_req))
#define LUT_CLEAR_PTA_WLAN_ACTIVE(lut, bt3_prio, bt3_txrx, bt_rf_act, \
                                  wifi_req, wifi_prio, wifi_txrx, \
                                  wifi_sh_ant_req) \
        LUT_PTA_WLAN_ACTIVE_OP(lut, &= ~, LUT_VALUE(bt3_prio, bt3_txrx, \
                               bt_rf_act, wifi_req, wifi_prio, wifi_txrx, \
                               wifi_sh_ant_req))

#define LUT_WLAN_KILL_OP(lut, op, val) \
        lut[(val) >> 4] op (cpu_to_le32(BIT(((val) << 1) & 0x1e)))
#define LUT_TEST_WLAN_KILL(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                           wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        (!!(LUT_WLAN_KILL_OP(lut, &, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
                             wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))))
#define LUT_SET_WLAN_KILL(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                          wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        LUT_WLAN_KILL_OP(lut, |=, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
                         wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))
#define LUT_CLEAR_WLAN_KILL(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                            wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        LUT_WLAN_KILL_OP(lut, &= ~, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
                         wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))

#define LUT_ANT_SWITCH_OP(lut, op, val) \
        lut[(val) >> 4] op (cpu_to_le32(BIT((((val) << 1) & 0x1e) + 1)))
#define LUT_TEST_ANT_SWITCH(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                            wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        (!!(LUT_ANT_SWITCH_OP(lut, &, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
                              wifi_req, wifi_prio, wifi_txrx, \
                              wifi_sh_ant_req))))
#define LUT_SET_ANT_SWITCH(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                           wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        LUT_ANT_SWITCH_OP(lut, |=, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
                          wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))
#define LUT_CLEAR_ANT_SWITCH(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
                             wifi_prio, wifi_txrx, wifi_sh_ant_req) \
        LUT_ANT_SWITCH_OP(lut, &= ~, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
                          wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))

static const __le32 iwlagn_def_3w_lookup[12] = {
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaeaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xcc00ff28),
        cpu_to_le32(0x0000aaaa),
        cpu_to_le32(0xcc00aaaa),
        cpu_to_le32(0x0000aaaa),
        cpu_to_le32(0xc0004000),
        cpu_to_le32(0x00004000),
        cpu_to_le32(0xf0005000),
        cpu_to_le32(0xf0005000),
};

static const __le32 iwlagn_concurrent_lookup[12] = {
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0xaaaaaaaa),
        cpu_to_le32(0x00000000),
        cpu_to_le32(0x00000000),
        cpu_to_le32(0x00000000),
        cpu_to_le32(0x00000000),
};

void iwlagn_send_advance_bt_config(struct iwl_priv *priv)
{
        struct iwl_basic_bt_cmd basic = {
                .max_kill = IWLAGN_BT_MAX_KILL_DEFAULT,
                .bt3_timer_t7_value = IWLAGN_BT3_T7_DEFAULT,
                .bt3_prio_sample_time = IWLAGN_BT3_PRIO_SAMPLE_DEFAULT,
                .bt3_timer_t2_value = IWLAGN_BT3_T2_DEFAULT,
        };
        struct iwl6000_bt_cmd bt_cmd_6000;
        struct iwl2000_bt_cmd bt_cmd_2000;
        int ret;

        BUILD_BUG_ON(sizeof(iwlagn_def_3w_lookup) !=
                        sizeof(basic.bt3_lookup_table));

        if (priv->cfg->bt_params) {
                if (priv->cfg->bt_params->bt_session_2) {
                        bt_cmd_2000.prio_boost = cpu_to_le32(
                                priv->cfg->bt_params->bt_prio_boost);
                        bt_cmd_2000.tx_prio_boost = 0;
                        bt_cmd_2000.rx_prio_boost = 0;
                } else {
                        bt_cmd_6000.prio_boost =
                                priv->cfg->bt_params->bt_prio_boost;
                        bt_cmd_6000.tx_prio_boost = 0;
                        bt_cmd_6000.rx_prio_boost = 0;
                }
        } else {
                IWL_ERR(priv, "failed to construct BT Coex Config\n");
                return;
        }

        basic.kill_ack_mask = priv->kill_ack_mask;
        basic.kill_cts_mask = priv->kill_cts_mask;
        basic.valid = priv->bt_valid;

        /*
         * Configure BT coex mode to "no coexistence" when the
         * user disabled BT coexistence, we have no interface
         * (might be in monitor mode), or the interface is in
         * IBSS mode (no proper uCode support for coex then).
         */
        if (!iwlagn_mod_params.bt_coex_active ||
            priv->iw_mode == NL80211_IFTYPE_ADHOC) {
                basic.flags = IWLAGN_BT_FLAG_COEX_MODE_DISABLED;
        } else {
                basic.flags = IWLAGN_BT_FLAG_COEX_MODE_3W <<
                                        IWLAGN_BT_FLAG_COEX_MODE_SHIFT;

                if (!priv->bt_enable_pspoll)
                        basic.flags |= IWLAGN_BT_FLAG_SYNC_2_BT_DISABLE;
                else
                        basic.flags &= ~IWLAGN_BT_FLAG_SYNC_2_BT_DISABLE;

                if (priv->bt_ch_announce)
                        basic.flags |= IWLAGN_BT_FLAG_CHANNEL_INHIBITION;
                IWL_DEBUG_COEX(priv, "BT coex flag: 0X%x\n", basic.flags);
        }
        priv->bt_enable_flag = basic.flags;
        if (priv->bt_full_concurrent)
                memcpy(basic.bt3_lookup_table, iwlagn_concurrent_lookup,
                        sizeof(iwlagn_concurrent_lookup));
        else
                memcpy(basic.bt3_lookup_table, iwlagn_def_3w_lookup,
                        sizeof(iwlagn_def_3w_lookup));

        IWL_DEBUG_COEX(priv, "BT coex %s in %s mode\n",
                       basic.flags ? "active" : "disabled",
                       priv->bt_full_concurrent ?
                       "full concurrency" : "3-wire");

        if (priv->cfg->bt_params->bt_session_2) {
                memcpy(&bt_cmd_2000.basic, &basic,
                        sizeof(basic));
                ret = iwl_trans_send_cmd_pdu(trans(priv), REPLY_BT_CONFIG,
                        CMD_SYNC, sizeof(bt_cmd_2000), &bt_cmd_2000);
        } else {
                memcpy(&bt_cmd_6000.basic, &basic,
                        sizeof(basic));
                ret = iwl_trans_send_cmd_pdu(trans(priv), REPLY_BT_CONFIG,
                        CMD_SYNC, sizeof(bt_cmd_6000), &bt_cmd_6000);
        }
        if (ret)
                IWL_ERR(priv, "failed to send BT Coex Config\n");

}

void iwlagn_bt_adjust_rssi_monitor(struct iwl_priv *priv, bool rssi_ena)
{
        struct iwl_rxon_context *ctx, *found_ctx = NULL;
        bool found_ap = false;

        lockdep_assert_held(&priv->shrd->mutex);

        /* Check whether AP or GO mode is active. */
        if (rssi_ena) {
                for_each_context(priv, ctx) {
                        if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_AP &&
                            iwl_is_associated_ctx(ctx)) {
                                found_ap = true;
                                break;
                        }
                }
        }

        /*
         * If disable was received or If GO/AP mode, disable RSSI
         * measurements.
         */
        if (!rssi_ena || found_ap) {
                if (priv->cur_rssi_ctx) {
                        ctx = priv->cur_rssi_ctx;
                        ieee80211_disable_rssi_reports(ctx->vif);
                        priv->cur_rssi_ctx = NULL;
                }
                return;
        }

        /*
         * If rssi measurements need to be enabled, consider all cases now.
         * Figure out how many contexts are active.
         */
        for_each_context(priv, ctx) {
                if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
                    iwl_is_associated_ctx(ctx)) {
                        found_ctx = ctx;
                        break;
                }
        }

        /*
         * rssi monitor already enabled for the correct interface...nothing
         * to do.
         */
        if (found_ctx == priv->cur_rssi_ctx)
                return;

        /*
         * Figure out if rssi monitor is currently enabled, and needs
         * to be changed. If rssi monitor is already enabled, disable
         * it first else just enable rssi measurements on the
         * interface found above.
         */
        if (priv->cur_rssi_ctx) {
                ctx = priv->cur_rssi_ctx;
                if (ctx->vif)
                        ieee80211_disable_rssi_reports(ctx->vif);
        }

        priv->cur_rssi_ctx = found_ctx;

        if (!found_ctx)
                return;

        ieee80211_enable_rssi_reports(found_ctx->vif,
                        IWLAGN_BT_PSP_MIN_RSSI_THRESHOLD,
                        IWLAGN_BT_PSP_MAX_RSSI_THRESHOLD);
}

static bool iwlagn_bt_traffic_is_sco(struct iwl_bt_uart_msg *uart_msg)
{
        return BT_UART_MSG_FRAME3SCOESCO_MSK & uart_msg->frame3 >>
                        BT_UART_MSG_FRAME3SCOESCO_POS;
}

static void iwlagn_bt_traffic_change_work(struct work_struct *work)
{
        struct iwl_priv *priv =
                container_of(work, struct iwl_priv, bt_traffic_change_work);
        struct iwl_rxon_context *ctx;
        int smps_request = -1;

        if (priv->bt_enable_flag == IWLAGN_BT_FLAG_COEX_MODE_DISABLED) {
                /* bt coex disabled */
                return;
        }

        /*
         * Note: bt_traffic_load can be overridden by scan complete and
         * coex profile notifications. Ignore that since only bad consequence
         * can be not matching debug print with actual state.
         */
        IWL_DEBUG_COEX(priv, "BT traffic load changes: %d\n",
                       priv->bt_traffic_load);

        switch (priv->bt_traffic_load) {
        case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
                if (priv->bt_status)
                        smps_request = IEEE80211_SMPS_DYNAMIC;
                else
                        smps_request = IEEE80211_SMPS_AUTOMATIC;
                break;
        case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
                smps_request = IEEE80211_SMPS_DYNAMIC;
                break;
        case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
        case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
                smps_request = IEEE80211_SMPS_STATIC;
                break;
        default:
                IWL_ERR(priv, "Invalid BT traffic load: %d\n",
                        priv->bt_traffic_load);
                break;
        }

        mutex_lock(&priv->shrd->mutex);

        /*
         * We can not send command to firmware while scanning. When the scan
         * complete we will schedule this work again. We do check with mutex
         * locked to prevent new scan request to arrive. We do not check
         * STATUS_SCANNING to avoid race when queue_work two times from
         * different notifications, but quit and not perform any work at all.
         */
        if (test_bit(STATUS_SCAN_HW, &priv->shrd->status))
                goto out;

        iwl_update_chain_flags(priv);

        if (smps_request != -1) {
                priv->current_ht_config.smps = smps_request;
                for_each_context(priv, ctx) {
                        if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION)
                                ieee80211_request_smps(ctx->vif, smps_request);
                }
        }

        /*
         * Dynamic PS poll related functionality. Adjust RSSI measurements if
         * necessary.
         */
        iwlagn_bt_coex_rssi_monitor(priv);
out:
        mutex_unlock(&priv->shrd->mutex);
}

/*
 * If BT sco traffic, and RSSI monitor is enabled, move measurements to the
 * correct interface or disable it if this is the last interface to be
 * removed.
 */
void iwlagn_bt_coex_rssi_monitor(struct iwl_priv *priv)
{
        if (priv->bt_is_sco &&
            priv->bt_traffic_load == IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS)
                iwlagn_bt_adjust_rssi_monitor(priv, true);
        else
                iwlagn_bt_adjust_rssi_monitor(priv, false);
}

static void iwlagn_print_uartmsg(struct iwl_priv *priv,
                                struct iwl_bt_uart_msg *uart_msg)
{
        IWL_DEBUG_COEX(priv, "Message Type = 0x%X, SSN = 0x%X, "
                        "Update Req = 0x%X",
                (BT_UART_MSG_FRAME1MSGTYPE_MSK & uart_msg->frame1) >>
                        BT_UART_MSG_FRAME1MSGTYPE_POS,
                (BT_UART_MSG_FRAME1SSN_MSK & uart_msg->frame1) >>
                        BT_UART_MSG_FRAME1SSN_POS,
                (BT_UART_MSG_FRAME1UPDATEREQ_MSK & uart_msg->frame1) >>
                        BT_UART_MSG_FRAME1UPDATEREQ_POS);

        IWL_DEBUG_COEX(priv, "Open connections = 0x%X, Traffic load = 0x%X, "
                        "Chl_SeqN = 0x%X, In band = 0x%X",
                (BT_UART_MSG_FRAME2OPENCONNECTIONS_MSK & uart_msg->frame2) >>
                        BT_UART_MSG_FRAME2OPENCONNECTIONS_POS,
                (BT_UART_MSG_FRAME2TRAFFICLOAD_MSK & uart_msg->frame2) >>
                        BT_UART_MSG_FRAME2TRAFFICLOAD_POS,
                (BT_UART_MSG_FRAME2CHLSEQN_MSK & uart_msg->frame2) >>
                        BT_UART_MSG_FRAME2CHLSEQN_POS,
                (BT_UART_MSG_FRAME2INBAND_MSK & uart_msg->frame2) >>
                        BT_UART_MSG_FRAME2INBAND_POS);

        IWL_DEBUG_COEX(priv, "SCO/eSCO = 0x%X, Sniff = 0x%X, A2DP = 0x%X, "
                        "ACL = 0x%X, Master = 0x%X, OBEX = 0x%X",
                (BT_UART_MSG_FRAME3SCOESCO_MSK & uart_msg->frame3) >>
                        BT_UART_MSG_FRAME3SCOESCO_POS,
                (BT_UART_MSG_FRAME3SNIFF_MSK & uart_msg->frame3) >>
                        BT_UART_MSG_FRAME3SNIFF_POS,
                (BT_UART_MSG_FRAME3A2DP_MSK & uart_msg->frame3) >>
                        BT_UART_MSG_FRAME3A2DP_POS,
                (BT_UART_MSG_FRAME3ACL_MSK & uart_msg->frame3) >>
                        BT_UART_MSG_FRAME3ACL_POS,
                (BT_UART_MSG_FRAME3MASTER_MSK & uart_msg->frame3) >>
                        BT_UART_MSG_FRAME3MASTER_POS,
                (BT_UART_MSG_FRAME3OBEX_MSK & uart_msg->frame3) >>
                        BT_UART_MSG_FRAME3OBEX_POS);

        IWL_DEBUG_COEX(priv, "Idle duration = 0x%X",
                (BT_UART_MSG_FRAME4IDLEDURATION_MSK & uart_msg->frame4) >>
                        BT_UART_MSG_FRAME4IDLEDURATION_POS);

        IWL_DEBUG_COEX(priv, "Tx Activity = 0x%X, Rx Activity = 0x%X, "
                        "eSCO Retransmissions = 0x%X",
                (BT_UART_MSG_FRAME5TXACTIVITY_MSK & uart_msg->frame5) >>
                        BT_UART_MSG_FRAME5TXACTIVITY_POS,
                (BT_UART_MSG_FRAME5RXACTIVITY_MSK & uart_msg->frame5) >>
                        BT_UART_MSG_FRAME5RXACTIVITY_POS,
                (BT_UART_MSG_FRAME5ESCORETRANSMIT_MSK & uart_msg->frame5) >>
                        BT_UART_MSG_FRAME5ESCORETRANSMIT_POS);

        IWL_DEBUG_COEX(priv, "Sniff Interval = 0x%X, Discoverable = 0x%X",
                (BT_UART_MSG_FRAME6SNIFFINTERVAL_MSK & uart_msg->frame6) >>
                        BT_UART_MSG_FRAME6SNIFFINTERVAL_POS,
                (BT_UART_MSG_FRAME6DISCOVERABLE_MSK & uart_msg->frame6) >>
                        BT_UART_MSG_FRAME6DISCOVERABLE_POS);

        IWL_DEBUG_COEX(priv, "Sniff Activity = 0x%X, Page = "
                        "0x%X, Inquiry = 0x%X, Connectable = 0x%X",
                (BT_UART_MSG_FRAME7SNIFFACTIVITY_MSK & uart_msg->frame7) >>
                        BT_UART_MSG_FRAME7SNIFFACTIVITY_POS,
                (BT_UART_MSG_FRAME7PAGE_MSK & uart_msg->frame7) >>
                        BT_UART_MSG_FRAME7PAGE_POS,
                (BT_UART_MSG_FRAME7INQUIRY_MSK & uart_msg->frame7) >>
                        BT_UART_MSG_FRAME7INQUIRY_POS,
                (BT_UART_MSG_FRAME7CONNECTABLE_MSK & uart_msg->frame7) >>
                        BT_UART_MSG_FRAME7CONNECTABLE_POS);
}

static void iwlagn_set_kill_msk(struct iwl_priv *priv,
                                struct iwl_bt_uart_msg *uart_msg)
{
        u8 kill_msk;
        static const __le32 bt_kill_ack_msg[2] = {
                IWLAGN_BT_KILL_ACK_MASK_DEFAULT,
                IWLAGN_BT_KILL_ACK_CTS_MASK_SCO };
        static const __le32 bt_kill_cts_msg[2] = {
                IWLAGN_BT_KILL_CTS_MASK_DEFAULT,
                IWLAGN_BT_KILL_ACK_CTS_MASK_SCO };

        kill_msk = (BT_UART_MSG_FRAME3SCOESCO_MSK & uart_msg->frame3)
                ? 1 : 0;
        if (priv->kill_ack_mask != bt_kill_ack_msg[kill_msk] ||
            priv->kill_cts_mask != bt_kill_cts_msg[kill_msk]) {
                priv->bt_valid |= IWLAGN_BT_VALID_KILL_ACK_MASK;
                priv->kill_ack_mask = bt_kill_ack_msg[kill_msk];
                priv->bt_valid |= IWLAGN_BT_VALID_KILL_CTS_MASK;
                priv->kill_cts_mask = bt_kill_cts_msg[kill_msk];

                /* schedule to send runtime bt_config */
                queue_work(priv->shrd->workqueue, &priv->bt_runtime_config);
        }
}

int iwlagn_bt_coex_profile_notif(struct iwl_priv *priv,
                                  struct iwl_rx_mem_buffer *rxb,
                                  struct iwl_device_cmd *cmd)
{
        unsigned long flags;
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_bt_coex_profile_notif *coex = &pkt->u.bt_coex_profile_notif;
        struct iwl_bt_uart_msg *uart_msg = &coex->last_bt_uart_msg;

        if (priv->bt_enable_flag == IWLAGN_BT_FLAG_COEX_MODE_DISABLED) {
                /* bt coex disabled */
                return 0;
        }

        IWL_DEBUG_COEX(priv, "BT Coex notification:\n");
        IWL_DEBUG_COEX(priv, "    status: %d\n", coex->bt_status);
        IWL_DEBUG_COEX(priv, "    traffic load: %d\n", coex->bt_traffic_load);
        IWL_DEBUG_COEX(priv, "    CI compliance: %d\n",
                        coex->bt_ci_compliance);
        iwlagn_print_uartmsg(priv, uart_msg);

        priv->last_bt_traffic_load = priv->bt_traffic_load;
        priv->bt_is_sco = iwlagn_bt_traffic_is_sco(uart_msg);

        if (priv->iw_mode != NL80211_IFTYPE_ADHOC) {
                if (priv->bt_status != coex->bt_status ||
                    priv->last_bt_traffic_load != coex->bt_traffic_load) {
                        if (coex->bt_status) {
                                /* BT on */
                                if (!priv->bt_ch_announce)
                                        priv->bt_traffic_load =
                                                IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
                                else
                                        priv->bt_traffic_load =
                                                coex->bt_traffic_load;
                        } else {
                                /* BT off */
                                priv->bt_traffic_load =
                                        IWL_BT_COEX_TRAFFIC_LOAD_NONE;
                        }
                        priv->bt_status = coex->bt_status;
                        queue_work(priv->shrd->workqueue,
                                   &priv->bt_traffic_change_work);
                }
        }

        iwlagn_set_kill_msk(priv, uart_msg);

        /* FIXME: based on notification, adjust the prio_boost */

        spin_lock_irqsave(&priv->shrd->lock, flags);
        priv->bt_ci_compliance = coex->bt_ci_compliance;
        spin_unlock_irqrestore(&priv->shrd->lock, flags);
        return 0;
}

void iwlagn_bt_rx_handler_setup(struct iwl_priv *priv)
{
        priv->rx_handlers[REPLY_BT_COEX_PROFILE_NOTIF] =
                iwlagn_bt_coex_profile_notif;
}

void iwlagn_bt_setup_deferred_work(struct iwl_priv *priv)
{
        INIT_WORK(&priv->bt_traffic_change_work,
                  iwlagn_bt_traffic_change_work);
}

void iwlagn_bt_cancel_deferred_work(struct iwl_priv *priv)
{
        cancel_work_sync(&priv->bt_traffic_change_work);
}

static bool is_single_rx_stream(struct iwl_priv *priv)
{
        return priv->current_ht_config.smps == IEEE80211_SMPS_STATIC ||
               priv->current_ht_config.single_chain_sufficient;
}

#define IWL_NUM_RX_CHAINS_MULTIPLE      3
#define IWL_NUM_RX_CHAINS_SINGLE        2
#define IWL_NUM_IDLE_CHAINS_DUAL        2
#define IWL_NUM_IDLE_CHAINS_SINGLE      1

/*
 * Determine how many receiver/antenna chains to use.
 *
 * More provides better reception via diversity.  Fewer saves power
 * at the expense of throughput, but only when not in powersave to
 * start with.
 *
 * MIMO (dual stream) requires at least 2, but works better with 3.
 * This does not determine *which* chains to use, just how many.
 */
static int iwl_get_active_rx_chain_count(struct iwl_priv *priv)
{
        if (priv->cfg->bt_params &&
            priv->cfg->bt_params->advanced_bt_coexist &&
            (priv->bt_full_concurrent ||
             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)) {
                /*
                 * only use chain 'A' in bt high traffic load or
                 * full concurrency mode
                 */
                return IWL_NUM_RX_CHAINS_SINGLE;
        }
        /* # of Rx chains to use when expecting MIMO. */
        if (is_single_rx_stream(priv))
                return IWL_NUM_RX_CHAINS_SINGLE;
        else
                return IWL_NUM_RX_CHAINS_MULTIPLE;
}

/*
 * When we are in power saving mode, unless device support spatial
 * multiplexing power save, use the active count for rx chain count.
 */
static int iwl_get_idle_rx_chain_count(struct iwl_priv *priv, int active_cnt)
{
        /* # Rx chains when idling, depending on SMPS mode */
        switch (priv->current_ht_config.smps) {
        case IEEE80211_SMPS_STATIC:
        case IEEE80211_SMPS_DYNAMIC:
                return IWL_NUM_IDLE_CHAINS_SINGLE;
        case IEEE80211_SMPS_OFF:
                return active_cnt;
        default:
                WARN(1, "invalid SMPS mode %d",
                     priv->current_ht_config.smps);
                return active_cnt;
        }
}

/* up to 4 chains */
static u8 iwl_count_chain_bitmap(u32 chain_bitmap)
{
        u8 res;
        res = (chain_bitmap & BIT(0)) >> 0;
        res += (chain_bitmap & BIT(1)) >> 1;
        res += (chain_bitmap & BIT(2)) >> 2;
        res += (chain_bitmap & BIT(3)) >> 3;
        return res;
}

/**
 * iwlagn_set_rxon_chain - Set up Rx chain usage in "staging" RXON image
 *
 * Selects how many and which Rx receivers/antennas/chains to use.
 * This should not be used for scan command ... it puts data in wrong place.
 */
void iwlagn_set_rxon_chain(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
{
        bool is_single = is_single_rx_stream(priv);
        bool is_cam = !test_bit(STATUS_POWER_PMI, &priv->shrd->status);
        u8 idle_rx_cnt, active_rx_cnt, valid_rx_cnt;
        u32 active_chains;
        u16 rx_chain;

        /* Tell uCode which antennas are actually connected.
         * Before first association, we assume all antennas are connected.
         * Just after first association, iwl_chain_noise_calibration()
         *    checks which antennas actually *are* connected. */
        if (priv->chain_noise_data.active_chains)
                active_chains = priv->chain_noise_data.active_chains;
        else
                active_chains = hw_params(priv).valid_rx_ant;

        if (priv->cfg->bt_params &&
            priv->cfg->bt_params->advanced_bt_coexist &&
            (priv->bt_full_concurrent ||
             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)) {
                /*
                 * only use chain 'A' in bt high traffic load or
                 * full concurrency mode
                 */
                active_chains = first_antenna(active_chains);
        }

        rx_chain = active_chains << RXON_RX_CHAIN_VALID_POS;

        /* How many receivers should we use? */
        active_rx_cnt = iwl_get_active_rx_chain_count(priv);
        idle_rx_cnt = iwl_get_idle_rx_chain_count(priv, active_rx_cnt);


        /* correct rx chain count according hw settings
         * and chain noise calibration
         */
        valid_rx_cnt = iwl_count_chain_bitmap(active_chains);
        if (valid_rx_cnt < active_rx_cnt)
                active_rx_cnt = valid_rx_cnt;

        if (valid_rx_cnt < idle_rx_cnt)
                idle_rx_cnt = valid_rx_cnt;

        rx_chain |= active_rx_cnt << RXON_RX_CHAIN_MIMO_CNT_POS;
        rx_chain |= idle_rx_cnt  << RXON_RX_CHAIN_CNT_POS;

        ctx->staging.rx_chain = cpu_to_le16(rx_chain);

        if (!is_single && (active_rx_cnt >= IWL_NUM_RX_CHAINS_SINGLE) && is_cam)
                ctx->staging.rx_chain |= RXON_RX_CHAIN_MIMO_FORCE_MSK;
        else
                ctx->staging.rx_chain &= ~RXON_RX_CHAIN_MIMO_FORCE_MSK;

        IWL_DEBUG_ASSOC(priv, "rx_chain=0x%X active=%d idle=%d\n",
                        ctx->staging.rx_chain,
                        active_rx_cnt, idle_rx_cnt);

        WARN_ON(active_rx_cnt == 0 || idle_rx_cnt == 0 ||
                active_rx_cnt < idle_rx_cnt);
}

u8 iwl_toggle_tx_ant(struct iwl_priv *priv, u8 ant, u8 valid)
{
        int i;
        u8 ind = ant;

        if (priv->band == IEEE80211_BAND_2GHZ &&
            priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
                return 0;

        for (i = 0; i < RATE_ANT_NUM - 1; i++) {
                ind = (ind + 1) < RATE_ANT_NUM ?  ind + 1 : 0;
                if (valid & BIT(ind))
                        return ind;
        }
        return ant;
}

/* notification wait support */
void iwlagn_init_notification_wait(struct iwl_priv *priv,
                                   struct iwl_notification_wait *wait_entry,
                                   u8 cmd,
                                   void (*fn)(struct iwl_priv *priv,
                                              struct iwl_rx_packet *pkt,
                                              void *data),
                                   void *fn_data)
{
        wait_entry->fn = fn;
        wait_entry->fn_data = fn_data;
        wait_entry->cmd = cmd;
        wait_entry->triggered = false;
        wait_entry->aborted = false;

        spin_lock_bh(&priv->notif_wait_lock);
        list_add(&wait_entry->list, &priv->notif_waits);
        spin_unlock_bh(&priv->notif_wait_lock);
}

int iwlagn_wait_notification(struct iwl_priv *priv,
                             struct iwl_notification_wait *wait_entry,
                             unsigned long timeout)
{
        int ret;

        ret = wait_event_timeout(priv->notif_waitq,
                                 wait_entry->triggered || wait_entry->aborted,
                                 timeout);

        spin_lock_bh(&priv->notif_wait_lock);
        list_del(&wait_entry->list);
        spin_unlock_bh(&priv->notif_wait_lock);

        if (wait_entry->aborted)
                return -EIO;

        /* return value is always >= 0 */
        if (ret <= 0)
                return -ETIMEDOUT;
        return 0;
}

void iwlagn_remove_notification(struct iwl_priv *priv,
                                struct iwl_notification_wait *wait_entry)
{
        spin_lock_bh(&priv->notif_wait_lock);
        list_del(&wait_entry->list);
        spin_unlock_bh(&priv->notif_wait_lock);
}