libertas: fix cmdpendingq locking

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / libertas / cmd.c

/**
  * This file contains the handling of command.
  * It prepares command and sends it to firmware when it is ready.
  */

#include <linux/kfifo.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/if_arp.h>

#include "decl.h"
#include "cfg.h"
#include "cmd.h"

#define CAL_NF(nf)              ((s32)(-(s32)(nf)))
#define CAL_RSSI(snr, nf)       ((s32)((s32)(snr) + CAL_NF(nf)))

/**
 *  @brief Simple callback that copies response back into command
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param extra        A pointer to the original command structure for which
 *                      'resp' is a response
 *  @param resp         A pointer to the command response
 *
 *  @return             0 on success, error on failure
 */
int lbs_cmd_copyback(struct lbs_private *priv, unsigned long extra,
                     struct cmd_header *resp)
{
        struct cmd_header *buf = (void *)extra;
        uint16_t copy_len;

        copy_len = min(le16_to_cpu(buf->size), le16_to_cpu(resp->size));
        memcpy(buf, resp, copy_len);
        return 0;
}
EXPORT_SYMBOL_GPL(lbs_cmd_copyback);

/**
 *  @brief Simple callback that ignores the result. Use this if
 *  you just want to send a command to the hardware, but don't
 *  care for the result.
 *
 *  @param priv         ignored
 *  @param extra        ignored
 *  @param resp         ignored
 *
 *  @return             0 for success
 */
static int lbs_cmd_async_callback(struct lbs_private *priv, unsigned long extra,
                     struct cmd_header *resp)
{
        return 0;
}


/**
 *  @brief Checks whether a command is allowed in Power Save mode
 *
 *  @param command the command ID
 *  @return        1 if allowed, 0 if not allowed
 */
static u8 is_command_allowed_in_ps(u16 cmd)
{
        switch (cmd) {
        case CMD_802_11_RSSI:
                return 1;
        case CMD_802_11_HOST_SLEEP_CFG:
                return 1;
        default:
                break;
        }
        return 0;
}

/**
 *  @brief Updates the hardware details like MAC address and regulatory region
 *
 *  @param priv         A pointer to struct lbs_private structure
 *
 *  @return             0 on success, error on failure
 */
int lbs_update_hw_spec(struct lbs_private *priv)
{
        struct cmd_ds_get_hw_spec cmd;
        int ret = -1;
        u32 i;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        memcpy(cmd.permanentaddr, priv->current_addr, ETH_ALEN);
        ret = lbs_cmd_with_response(priv, CMD_GET_HW_SPEC, &cmd);
        if (ret)
                goto out;

        priv->fwcapinfo = le32_to_cpu(cmd.fwcapinfo);

        /* The firmware release is in an interesting format: the patch
         * level is in the most significant nibble ... so fix that: */
        priv->fwrelease = le32_to_cpu(cmd.fwrelease);
        priv->fwrelease = (priv->fwrelease << 8) |
                (priv->fwrelease >> 24 & 0xff);

        /* Some firmware capabilities:
         * CF card    firmware 5.0.16p0:   cap 0x00000303
         * USB dongle firmware 5.110.17p2: cap 0x00000303
         */
        lbs_pr_info("%pM, fw %u.%u.%up%u, cap 0x%08x\n",
                cmd.permanentaddr,
                priv->fwrelease >> 24 & 0xff,
                priv->fwrelease >> 16 & 0xff,
                priv->fwrelease >>  8 & 0xff,
                priv->fwrelease       & 0xff,
                priv->fwcapinfo);
        lbs_deb_cmd("GET_HW_SPEC: hardware interface 0x%x, hardware spec 0x%04x\n",
                    cmd.hwifversion, cmd.version);

        /* Clamp region code to 8-bit since FW spec indicates that it should
         * only ever be 8-bit, even though the field size is 16-bit.  Some firmware
         * returns non-zero high 8 bits here.
         *
         * Firmware version 4.0.102 used in CF8381 has region code shifted.  We
         * need to check for this problem and handle it properly.
         */
        if (MRVL_FW_MAJOR_REV(priv->fwrelease) == MRVL_FW_V4)
                priv->regioncode = (le16_to_cpu(cmd.regioncode) >> 8) & 0xFF;
        else
                priv->regioncode = le16_to_cpu(cmd.regioncode) & 0xFF;

        for (i = 0; i < MRVDRV_MAX_REGION_CODE; i++) {
                /* use the region code to search for the index */
                if (priv->regioncode == lbs_region_code_to_index[i])
                        break;
        }

        /* if it's unidentified region code, use the default (USA) */
        if (i >= MRVDRV_MAX_REGION_CODE) {
                priv->regioncode = 0x10;
                lbs_pr_info("unidentified region code; using the default (USA)\n");
        }

        if (priv->current_addr[0] == 0xff)
                memmove(priv->current_addr, cmd.permanentaddr, ETH_ALEN);

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

out:
        lbs_deb_leave(LBS_DEB_CMD);
        return ret;
}

static int lbs_ret_host_sleep_cfg(struct lbs_private *priv, unsigned long dummy,
                        struct cmd_header *resp)
{
        lbs_deb_enter(LBS_DEB_CMD);
        if (priv->is_host_sleep_activated) {
                priv->is_host_sleep_configured = 0;
                if (priv->psstate == PS_STATE_FULL_POWER) {
                        priv->is_host_sleep_activated = 0;
                        wake_up_interruptible(&priv->host_sleep_q);
                }
        } else {
                priv->is_host_sleep_configured = 1;
        }
        lbs_deb_leave(LBS_DEB_CMD);
        return 0;
}

int lbs_host_sleep_cfg(struct lbs_private *priv, uint32_t criteria,
                struct wol_config *p_wol_config)
{
        struct cmd_ds_host_sleep cmd_config;
        int ret;

        /*
         * Certain firmware versions do not support EHS_REMOVE_WAKEUP command
         * and the card will return a failure.  Since we need to be
         * able to reset the mask, in those cases we set a 0 mask instead.
         */
        if (criteria == EHS_REMOVE_WAKEUP && !priv->ehs_remove_supported)
                criteria = 0;

        cmd_config.hdr.size = cpu_to_le16(sizeof(cmd_config));
        cmd_config.criteria = cpu_to_le32(criteria);
        cmd_config.gpio = priv->wol_gpio;
        cmd_config.gap = priv->wol_gap;

        if (p_wol_config != NULL)
                memcpy((uint8_t *)&cmd_config.wol_conf, (uint8_t *)p_wol_config,
                                sizeof(struct wol_config));
        else
                cmd_config.wol_conf.action = CMD_ACT_ACTION_NONE;

        ret = __lbs_cmd(priv, CMD_802_11_HOST_SLEEP_CFG, &cmd_config.hdr,
                        le16_to_cpu(cmd_config.hdr.size),
                        lbs_ret_host_sleep_cfg, 0);
        if (!ret) {
                if (p_wol_config)
                        memcpy((uint8_t *) p_wol_config,
                                        (uint8_t *)&cmd_config.wol_conf,
                                        sizeof(struct wol_config));
        } else {
                lbs_pr_info("HOST_SLEEP_CFG failed %d\n", ret);
        }

        return ret;
}
EXPORT_SYMBOL_GPL(lbs_host_sleep_cfg);

/**
 *  @brief Sets the Power Save mode
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param cmd_action   The Power Save operation (PS_MODE_ACTION_ENTER_PS or
 *                         PS_MODE_ACTION_EXIT_PS)
 *  @param block        Whether to block on a response or not
 *
 *  @return             0 on success, error on failure
 */
int lbs_set_ps_mode(struct lbs_private *priv, u16 cmd_action, bool block)
{
        struct cmd_ds_802_11_ps_mode cmd;
        int ret = 0;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(cmd_action);

        if (cmd_action == PS_MODE_ACTION_ENTER_PS) {
                lbs_deb_cmd("PS_MODE: action ENTER_PS\n");
                cmd.multipledtim = cpu_to_le16(1);  /* Default DTIM multiple */
        } else if (cmd_action == PS_MODE_ACTION_EXIT_PS) {
                lbs_deb_cmd("PS_MODE: action EXIT_PS\n");
        } else {
                /* We don't handle CONFIRM_SLEEP here because it needs to
                 * be fastpathed to the firmware.
                 */
                lbs_deb_cmd("PS_MODE: unknown action 0x%X\n", cmd_action);
                ret = -EOPNOTSUPP;
                goto out;
        }

        if (block)
                ret = lbs_cmd_with_response(priv, CMD_802_11_PS_MODE, &cmd);
        else
                lbs_cmd_async(priv, CMD_802_11_PS_MODE, &cmd.hdr, sizeof (cmd));

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

int lbs_cmd_802_11_sleep_params(struct lbs_private *priv, uint16_t cmd_action,
                                struct sleep_params *sp)
{
        struct cmd_ds_802_11_sleep_params cmd;
        int ret;

        lbs_deb_enter(LBS_DEB_CMD);

        if (cmd_action == CMD_ACT_GET) {
                memset(&cmd, 0, sizeof(cmd));
        } else {
                cmd.error = cpu_to_le16(sp->sp_error);
                cmd.offset = cpu_to_le16(sp->sp_offset);
                cmd.stabletime = cpu_to_le16(sp->sp_stabletime);
                cmd.calcontrol = sp->sp_calcontrol;
                cmd.externalsleepclk = sp->sp_extsleepclk;
                cmd.reserved = cpu_to_le16(sp->sp_reserved);
        }
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(cmd_action);

        ret = lbs_cmd_with_response(priv, CMD_802_11_SLEEP_PARAMS, &cmd);

        if (!ret) {
                lbs_deb_cmd("error 0x%x, offset 0x%x, stabletime 0x%x, "
                            "calcontrol 0x%x extsleepclk 0x%x\n",
                            le16_to_cpu(cmd.error), le16_to_cpu(cmd.offset),
                            le16_to_cpu(cmd.stabletime), cmd.calcontrol,
                            cmd.externalsleepclk);

                sp->sp_error = le16_to_cpu(cmd.error);
                sp->sp_offset = le16_to_cpu(cmd.offset);
                sp->sp_stabletime = le16_to_cpu(cmd.stabletime);
                sp->sp_calcontrol = cmd.calcontrol;
                sp->sp_extsleepclk = cmd.externalsleepclk;
                sp->sp_reserved = le16_to_cpu(cmd.reserved);
        }

        lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
        return 0;
}

static int lbs_wait_for_ds_awake(struct lbs_private *priv)
{
        int ret = 0;

        lbs_deb_enter(LBS_DEB_CMD);

        if (priv->is_deep_sleep) {
                if (!wait_event_interruptible_timeout(priv->ds_awake_q,
                                        !priv->is_deep_sleep, (10 * HZ))) {
                        lbs_pr_err("ds_awake_q: timer expired\n");
                        ret = -1;
                }
        }

        lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
        return ret;
}

int lbs_set_deep_sleep(struct lbs_private *priv, int deep_sleep)
{
        int ret =  0;

        lbs_deb_enter(LBS_DEB_CMD);

        if (deep_sleep) {
                if (priv->is_deep_sleep != 1) {
                        lbs_deb_cmd("deep sleep: sleep\n");
                        BUG_ON(!priv->enter_deep_sleep);
                        ret = priv->enter_deep_sleep(priv);
                        if (!ret) {
                                netif_stop_queue(priv->dev);
                                netif_carrier_off(priv->dev);
                        }
                } else {
                        lbs_pr_err("deep sleep: already enabled\n");
                }
        } else {
                if (priv->is_deep_sleep) {
                        lbs_deb_cmd("deep sleep: wakeup\n");
                        BUG_ON(!priv->exit_deep_sleep);
                        ret = priv->exit_deep_sleep(priv);
                        if (!ret) {
                                ret = lbs_wait_for_ds_awake(priv);
                                if (ret)
                                        lbs_pr_err("deep sleep: wakeup"
                                                        "failed\n");
                        }
                }
        }

        lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
        return ret;
}

static int lbs_ret_host_sleep_activate(struct lbs_private *priv,
                unsigned long dummy,
                struct cmd_header *cmd)
{
        lbs_deb_enter(LBS_DEB_FW);
        priv->is_host_sleep_activated = 1;
        wake_up_interruptible(&priv->host_sleep_q);
        lbs_deb_leave(LBS_DEB_FW);
        return 0;
}

int lbs_set_host_sleep(struct lbs_private *priv, int host_sleep)
{
        struct cmd_header cmd;
        int ret = 0;
        uint32_t criteria = EHS_REMOVE_WAKEUP;

        lbs_deb_enter(LBS_DEB_CMD);

        if (host_sleep) {
                if (priv->is_host_sleep_activated != 1) {
                        memset(&cmd, 0, sizeof(cmd));
                        ret = lbs_host_sleep_cfg(priv, priv->wol_criteria,
                                        (struct wol_config *)NULL);
                        if (ret) {
                                lbs_pr_info("Host sleep configuration failed: "
                                                "%d\n", ret);
                                return ret;
                        }
                        if (priv->psstate == PS_STATE_FULL_POWER) {
                                ret = __lbs_cmd(priv,
                                                CMD_802_11_HOST_SLEEP_ACTIVATE,
                                                &cmd,
                                                sizeof(cmd),
                                                lbs_ret_host_sleep_activate, 0);
                                if (ret)
                                        lbs_pr_info("HOST_SLEEP_ACTIVATE "
                                                        "failed: %d\n", ret);
                        }

                        if (!wait_event_interruptible_timeout(
                                                priv->host_sleep_q,
                                                priv->is_host_sleep_activated,
                                                (10 * HZ))) {
                                lbs_pr_err("host_sleep_q: timer expired\n");
                                ret = -1;
                        }
                } else {
                        lbs_pr_err("host sleep: already enabled\n");
                }
        } else {
                if (priv->is_host_sleep_activated)
                        ret = lbs_host_sleep_cfg(priv, criteria,
                                        (struct wol_config *)NULL);
        }

        return ret;
}

/**
 *  @brief Set an SNMP MIB value
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param oid          The OID to set in the firmware
 *  @param val          Value to set the OID to
 *
 *  @return             0 on success, error on failure
 */
int lbs_set_snmp_mib(struct lbs_private *priv, u32 oid, u16 val)
{
        struct cmd_ds_802_11_snmp_mib cmd;
        int ret;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof (cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);
        cmd.oid = cpu_to_le16((u16) oid);

        switch (oid) {
        case SNMP_MIB_OID_BSS_TYPE:
                cmd.bufsize = cpu_to_le16(sizeof(u8));
                cmd.value[0] = val;
                break;
        case SNMP_MIB_OID_11D_ENABLE:
        case SNMP_MIB_OID_FRAG_THRESHOLD:
        case SNMP_MIB_OID_RTS_THRESHOLD:
        case SNMP_MIB_OID_SHORT_RETRY_LIMIT:
        case SNMP_MIB_OID_LONG_RETRY_LIMIT:
                cmd.bufsize = cpu_to_le16(sizeof(u16));
                *((__le16 *)(&cmd.value)) = cpu_to_le16(val);
                break;
        default:
                lbs_deb_cmd("SNMP_CMD: (set) unhandled OID 0x%x\n", oid);
                ret = -EINVAL;
                goto out;
        }

        lbs_deb_cmd("SNMP_CMD: (set) oid 0x%x, oid size 0x%x, value 0x%x\n",
                    le16_to_cpu(cmd.oid), le16_to_cpu(cmd.bufsize), val);

        ret = lbs_cmd_with_response(priv, CMD_802_11_SNMP_MIB, &cmd);

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

/**
 *  @brief Get an SNMP MIB value
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param oid          The OID to retrieve from the firmware
 *  @param out_val      Location for the returned value
 *
 *  @return             0 on success, error on failure
 */
int lbs_get_snmp_mib(struct lbs_private *priv, u32 oid, u16 *out_val)
{
        struct cmd_ds_802_11_snmp_mib cmd;
        int ret;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof (cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_GET);
        cmd.oid = cpu_to_le16(oid);

        ret = lbs_cmd_with_response(priv, CMD_802_11_SNMP_MIB, &cmd);
        if (ret)
                goto out;

        switch (le16_to_cpu(cmd.bufsize)) {
        case sizeof(u8):
                *out_val = cmd.value[0];
                break;
        case sizeof(u16):
                *out_val = le16_to_cpu(*((__le16 *)(&cmd.value)));
                break;
        default:
                lbs_deb_cmd("SNMP_CMD: (get) unhandled OID 0x%x size %d\n",
                            oid, le16_to_cpu(cmd.bufsize));
                break;
        }

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

/**
 *  @brief Get the min, max, and current TX power
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param curlevel     Current power level in dBm
 *  @param minlevel     Minimum supported power level in dBm (optional)
 *  @param maxlevel     Maximum supported power level in dBm (optional)
 *
 *  @return             0 on success, error on failure
 */
int lbs_get_tx_power(struct lbs_private *priv, s16 *curlevel, s16 *minlevel,
                     s16 *maxlevel)
{
        struct cmd_ds_802_11_rf_tx_power cmd;
        int ret;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_GET);

        ret = lbs_cmd_with_response(priv, CMD_802_11_RF_TX_POWER, &cmd);
        if (ret == 0) {
                *curlevel = le16_to_cpu(cmd.curlevel);
                if (minlevel)
                        *minlevel = cmd.minlevel;
                if (maxlevel)
                        *maxlevel = cmd.maxlevel;
        }

        lbs_deb_leave(LBS_DEB_CMD);
        return ret;
}

/**
 *  @brief Set the TX power
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param dbm          The desired power level in dBm
 *
 *  @return             0 on success, error on failure
 */
int lbs_set_tx_power(struct lbs_private *priv, s16 dbm)
{
        struct cmd_ds_802_11_rf_tx_power cmd;
        int ret;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);
        cmd.curlevel = cpu_to_le16(dbm);

        lbs_deb_cmd("SET_RF_TX_POWER: %d dBm\n", dbm);

        ret = lbs_cmd_with_response(priv, CMD_802_11_RF_TX_POWER, &cmd);

        lbs_deb_leave(LBS_DEB_CMD);
        return ret;
}

/**
 *  @brief Enable or disable monitor mode (only implemented on OLPC usb8388 FW)
 *
 *  @param priv        A pointer to struct lbs_private structure
 *  @param enable      1 to enable monitor mode, 0 to disable
 *
 *  @return            0 on success, error on failure
 */
int lbs_set_monitor_mode(struct lbs_private *priv, int enable)
{
        struct cmd_ds_802_11_monitor_mode cmd;
        int ret;

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);
        if (enable)
                cmd.mode = cpu_to_le16(0x1);

        lbs_deb_cmd("SET_MONITOR_MODE: %d\n", enable);

        ret = lbs_cmd_with_response(priv, CMD_802_11_MONITOR_MODE, &cmd);
        if (ret == 0) {
                priv->dev->type = enable ? ARPHRD_IEEE80211_RADIOTAP :
                                                ARPHRD_ETHER;
        }

        lbs_deb_leave(LBS_DEB_CMD);
        return ret;
}

/**
 *  @brief Get the radio channel
 *
 *  @param priv         A pointer to struct lbs_private structure
 *
 *  @return             The channel on success, error on failure
 */
static int lbs_get_channel(struct lbs_private *priv)
{
        struct cmd_ds_802_11_rf_channel cmd;
        int ret = 0;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_OPT_802_11_RF_CHANNEL_GET);

        ret = lbs_cmd_with_response(priv, CMD_802_11_RF_CHANNEL, &cmd);
        if (ret)
                goto out;

        ret = le16_to_cpu(cmd.channel);
        lbs_deb_cmd("current radio channel is %d\n", ret);

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

int lbs_update_channel(struct lbs_private *priv)
{
        int ret;

        /* the channel in f/w could be out of sync; get the current channel */
        lbs_deb_enter(LBS_DEB_ASSOC);

        ret = lbs_get_channel(priv);
        if (ret > 0) {
                priv->channel = ret;
                ret = 0;
        }
        lbs_deb_leave_args(LBS_DEB_ASSOC, "ret %d", ret);
        return ret;
}

/**
 *  @brief Set the radio channel
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param channel      The desired channel, or 0 to clear a locked channel
 *
 *  @return             0 on success, error on failure
 */
int lbs_set_channel(struct lbs_private *priv, u8 channel)
{
        struct cmd_ds_802_11_rf_channel cmd;
#ifdef DEBUG
        u8 old_channel = priv->channel;
#endif
        int ret = 0;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_OPT_802_11_RF_CHANNEL_SET);
        cmd.channel = cpu_to_le16(channel);

        ret = lbs_cmd_with_response(priv, CMD_802_11_RF_CHANNEL, &cmd);
        if (ret)
                goto out;

        priv->channel = (uint8_t) le16_to_cpu(cmd.channel);
        lbs_deb_cmd("channel switch from %d to %d\n", old_channel,
                priv->channel);

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

/**
 *  @brief Get current RSSI and noise floor
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param rssi         On successful return, signal level in mBm
 *
 *  @return             The channel on success, error on failure
 */
int lbs_get_rssi(struct lbs_private *priv, s8 *rssi, s8 *nf)
{
        struct cmd_ds_802_11_rssi cmd;
        int ret = 0;

        lbs_deb_enter(LBS_DEB_CMD);

        BUG_ON(rssi == NULL);
        BUG_ON(nf == NULL);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        /* Average SNR over last 8 beacons */
        cmd.n_or_snr = cpu_to_le16(8);

        ret = lbs_cmd_with_response(priv, CMD_802_11_RSSI, &cmd);
        if (ret == 0) {
                *nf = CAL_NF(le16_to_cpu(cmd.nf));
                *rssi = CAL_RSSI(le16_to_cpu(cmd.n_or_snr), le16_to_cpu(cmd.nf));
        }

        lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
        return ret;
}

/**
 *  @brief Send regulatory and 802.11d domain information to the firmware
 *
 *  @param priv         pointer to struct lbs_private
 *  @param request      cfg80211 regulatory request structure
 *  @param bands        the device's supported bands and channels
 *
 *  @return             0 on success, error code on failure
*/
int lbs_set_11d_domain_info(struct lbs_private *priv,
                            struct regulatory_request *request,
                            struct ieee80211_supported_band **bands)
{
        struct cmd_ds_802_11d_domain_info cmd;
        struct mrvl_ie_domain_param_set *domain = &cmd.domain;
        struct ieee80211_country_ie_triplet *t;
        enum ieee80211_band band;
        struct ieee80211_channel *ch;
        u8 num_triplet = 0;
        u8 num_parsed_chan = 0;
        u8 first_channel = 0, next_chan = 0, max_pwr = 0;
        u8 i, flag = 0;
        size_t triplet_size;
        int ret;

        lbs_deb_enter(LBS_DEB_11D);

        memset(&cmd, 0, sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);

        lbs_deb_11d("Setting country code '%c%c'\n",
                    request->alpha2[0], request->alpha2[1]);

        domain->header.type = cpu_to_le16(TLV_TYPE_DOMAIN);

        /* Set country code */
        domain->country_code[0] = request->alpha2[0];
        domain->country_code[1] = request->alpha2[1];
        domain->country_code[2] = ' ';

        /* Now set up the channel triplets; firmware is somewhat picky here
         * and doesn't validate channel numbers and spans; hence it would
         * interpret a triplet of (36, 4, 20) as channels 36, 37, 38, 39.  Since
         * the last 3 aren't valid channels, the driver is responsible for
         * splitting that up into 4 triplet pairs of (36, 1, 20) + (40, 1, 20)
         * etc.
         */
        for (band = 0;
             (band < IEEE80211_NUM_BANDS) && (num_triplet < MAX_11D_TRIPLETS);
             band++) {

                if (!bands[band])
                        continue;

                for (i = 0;
                     (i < bands[band]->n_channels) && (num_triplet < MAX_11D_TRIPLETS);
                     i++) {
                        ch = &bands[band]->channels[i];
                        if (ch->flags & IEEE80211_CHAN_DISABLED)
                                continue;

                        if (!flag) {
                                flag = 1;
                                next_chan = first_channel = (u32) ch->hw_value;
                                max_pwr = ch->max_power;
                                num_parsed_chan = 1;
                                continue;
                        }

                        if ((ch->hw_value == next_chan + 1) &&
                                        (ch->max_power == max_pwr)) {
                                /* Consolidate adjacent channels */
                                next_chan++;
                                num_parsed_chan++;
                        } else {
                                /* Add this triplet */
                                lbs_deb_11d("11D triplet (%d, %d, %d)\n",
                                        first_channel, num_parsed_chan,
                                        max_pwr);
                                t = &domain->triplet[num_triplet];
                                t->chans.first_channel = first_channel;
                                t->chans.num_channels = num_parsed_chan;
                                t->chans.max_power = max_pwr;
                                num_triplet++;
                                flag = 0;
                        }
                }

                if (flag) {
                        /* Add last triplet */
                        lbs_deb_11d("11D triplet (%d, %d, %d)\n", first_channel,
                                num_parsed_chan, max_pwr);
                        t = &domain->triplet[num_triplet];
                        t->chans.first_channel = first_channel;
                        t->chans.num_channels = num_parsed_chan;
                        t->chans.max_power = max_pwr;
                        num_triplet++;
                }
        }

        lbs_deb_11d("# triplets %d\n", num_triplet);

        /* Set command header sizes */
        triplet_size = num_triplet * sizeof(struct ieee80211_country_ie_triplet);
        domain->header.len = cpu_to_le16(sizeof(domain->country_code) +
                                        triplet_size);

        lbs_deb_hex(LBS_DEB_11D, "802.11D domain param set",
                        (u8 *) &cmd.domain.country_code,
                        le16_to_cpu(domain->header.len));

        cmd.hdr.size = cpu_to_le16(sizeof(cmd.hdr) +
                                   sizeof(cmd.action) +
                                   sizeof(cmd.domain.header) +
                                   sizeof(cmd.domain.country_code) +
                                   triplet_size);

        ret = lbs_cmd_with_response(priv, CMD_802_11D_DOMAIN_INFO, &cmd);

        lbs_deb_leave_args(LBS_DEB_11D, "ret %d", ret);
        return ret;
}

/**
 *  @brief Read a MAC, Baseband, or RF register
 *
 *  @param priv         pointer to struct lbs_private
 *  @param cmd          register command, one of CMD_MAC_REG_ACCESS,
 *                        CMD_BBP_REG_ACCESS, or CMD_RF_REG_ACCESS
 *  @param offset       byte offset of the register to get
 *  @param value        on success, the value of the register at 'offset'
 *
 *  @return             0 on success, error code on failure
*/
int lbs_get_reg(struct lbs_private *priv, u16 reg, u16 offset, u32 *value)
{
        struct cmd_ds_reg_access cmd;
        int ret = 0;

        lbs_deb_enter(LBS_DEB_CMD);

        BUG_ON(value == NULL);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_GET);

        if (reg != CMD_MAC_REG_ACCESS &&
            reg != CMD_BBP_REG_ACCESS &&
            reg != CMD_RF_REG_ACCESS) {
                ret = -EINVAL;
                goto out;
        }

        ret = lbs_cmd_with_response(priv, reg, &cmd);
        if (ret) {
                if (reg == CMD_BBP_REG_ACCESS || reg == CMD_RF_REG_ACCESS)
                        *value = cmd.value.bbp_rf;
                else if (reg == CMD_MAC_REG_ACCESS)
                        *value = le32_to_cpu(cmd.value.mac);
        }

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

/**
 *  @brief Write a MAC, Baseband, or RF register
 *
 *  @param priv         pointer to struct lbs_private
 *  @param cmd          register command, one of CMD_MAC_REG_ACCESS,
 *                        CMD_BBP_REG_ACCESS, or CMD_RF_REG_ACCESS
 *  @param offset       byte offset of the register to set
 *  @param value        the value to write to the register at 'offset'
 *
 *  @return             0 on success, error code on failure
*/
int lbs_set_reg(struct lbs_private *priv, u16 reg, u16 offset, u32 value)
{
        struct cmd_ds_reg_access cmd;
        int ret = 0;

        lbs_deb_enter(LBS_DEB_CMD);

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);

        if (reg == CMD_BBP_REG_ACCESS || reg == CMD_RF_REG_ACCESS)
                cmd.value.bbp_rf = (u8) (value & 0xFF);
        else if (reg == CMD_MAC_REG_ACCESS)
                cmd.value.mac = cpu_to_le32(value);
        else {
                ret = -EINVAL;
                goto out;
        }

        ret = lbs_cmd_with_response(priv, reg, &cmd);

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

static void lbs_queue_cmd(struct lbs_private *priv,
                          struct cmd_ctrl_node *cmdnode)
{
        unsigned long flags;
        int addtail = 1;

        lbs_deb_enter(LBS_DEB_HOST);

        if (!cmdnode) {
                lbs_deb_host("QUEUE_CMD: cmdnode is NULL\n");
                goto done;
        }
        if (!cmdnode->cmdbuf->size) {
                lbs_deb_host("DNLD_CMD: cmd size is zero\n");
                goto done;
        }
        cmdnode->result = 0;

        /* Exit_PS command needs to be queued in the header always. */
        if (le16_to_cpu(cmdnode->cmdbuf->command) == CMD_802_11_PS_MODE) {
                struct cmd_ds_802_11_ps_mode *psm = (void *) &cmdnode->cmdbuf;

                if (psm->action == cpu_to_le16(PS_MODE_ACTION_EXIT_PS)) {
                        if (priv->psstate != PS_STATE_FULL_POWER)
                                addtail = 0;
                }
        }

        if (le16_to_cpu(cmdnode->cmdbuf->command) == CMD_802_11_WAKEUP_CONFIRM)
                addtail = 0;

        spin_lock_irqsave(&priv->driver_lock, flags);

        if (addtail)
                list_add_tail(&cmdnode->list, &priv->cmdpendingq);
        else
                list_add(&cmdnode->list, &priv->cmdpendingq);

        spin_unlock_irqrestore(&priv->driver_lock, flags);

        lbs_deb_host("QUEUE_CMD: inserted command 0x%04x into cmdpendingq\n",
                     le16_to_cpu(cmdnode->cmdbuf->command));

done:
        lbs_deb_leave(LBS_DEB_HOST);
}

static void lbs_submit_command(struct lbs_private *priv,
                               struct cmd_ctrl_node *cmdnode)
{
        unsigned long flags;
        struct cmd_header *cmd;
        uint16_t cmdsize;
        uint16_t command;
        int timeo = 3 * HZ;
        int ret;

        lbs_deb_enter(LBS_DEB_HOST);

        cmd = cmdnode->cmdbuf;

        spin_lock_irqsave(&priv->driver_lock, flags);
        priv->cur_cmd = cmdnode;
        spin_unlock_irqrestore(&priv->driver_lock, flags);

        cmdsize = le16_to_cpu(cmd->size);
        command = le16_to_cpu(cmd->command);

        /* These commands take longer */
        if (command == CMD_802_11_SCAN || command == CMD_802_11_ASSOCIATE)
                timeo = 5 * HZ;

        lbs_deb_cmd("DNLD_CMD: command 0x%04x, seq %d, size %d\n",
                     command, le16_to_cpu(cmd->seqnum), cmdsize);
        lbs_deb_hex(LBS_DEB_CMD, "DNLD_CMD", (void *) cmdnode->cmdbuf, cmdsize);

        ret = priv->hw_host_to_card(priv, MVMS_CMD, (u8 *) cmd, cmdsize);

        if (ret) {
                lbs_pr_info("DNLD_CMD: hw_host_to_card failed: %d\n", ret);
                /* Let the timer kick in and retry, and potentially reset
                   the whole thing if the condition persists */
                timeo = HZ/4;
        }

        if (command == CMD_802_11_DEEP_SLEEP) {
                if (priv->is_auto_deep_sleep_enabled) {
                        priv->wakeup_dev_required = 1;
                        priv->dnld_sent = 0;
                }
                priv->is_deep_sleep = 1;
                lbs_complete_command(priv, cmdnode, 0);
        } else {
                /* Setup the timer after transmit command */
                mod_timer(&priv->command_timer, jiffies + timeo);
        }

        lbs_deb_leave(LBS_DEB_HOST);
}

/**
 *  This function inserts command node to cmdfreeq
 *  after cleans it. Requires priv->driver_lock held.
 */
static void __lbs_cleanup_and_insert_cmd(struct lbs_private *priv,
                                         struct cmd_ctrl_node *cmdnode)
{
        lbs_deb_enter(LBS_DEB_HOST);

        if (!cmdnode)
                goto out;

        cmdnode->callback = NULL;
        cmdnode->callback_arg = 0;

        memset(cmdnode->cmdbuf, 0, LBS_CMD_BUFFER_SIZE);

        list_add_tail(&cmdnode->list, &priv->cmdfreeq);
 out:
        lbs_deb_leave(LBS_DEB_HOST);
}

static void lbs_cleanup_and_insert_cmd(struct lbs_private *priv,
        struct cmd_ctrl_node *ptempcmd)
{
        unsigned long flags;

        spin_lock_irqsave(&priv->driver_lock, flags);
        __lbs_cleanup_and_insert_cmd(priv, ptempcmd);
        spin_unlock_irqrestore(&priv->driver_lock, flags);
}

void lbs_complete_command(struct lbs_private *priv, struct cmd_ctrl_node *cmd,
                          int result)
{
        cmd->result = result;
        cmd->cmdwaitqwoken = 1;
        wake_up_interruptible(&cmd->cmdwait_q);

        if (!cmd->callback || cmd->callback == lbs_cmd_async_callback)
                __lbs_cleanup_and_insert_cmd(priv, cmd);
        priv->cur_cmd = NULL;
}

int lbs_set_radio(struct lbs_private *priv, u8 preamble, u8 radio_on)
{
        struct cmd_ds_802_11_radio_control cmd;
        int ret = -EINVAL;

        lbs_deb_enter(LBS_DEB_CMD);

        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);

        /* Only v8 and below support setting the preamble */
        if (priv->fwrelease < 0x09000000) {
                switch (preamble) {
                case RADIO_PREAMBLE_SHORT:
                case RADIO_PREAMBLE_AUTO:
                case RADIO_PREAMBLE_LONG:
                        cmd.control = cpu_to_le16(preamble);
                        break;
                default:
                        goto out;
                }
        }

        if (radio_on)
                cmd.control |= cpu_to_le16(0x1);
        else {
                cmd.control &= cpu_to_le16(~0x1);
                priv->txpower_cur = 0;
        }

        lbs_deb_cmd("RADIO_CONTROL: radio %s, preamble %d\n",
                    radio_on ? "ON" : "OFF", preamble);

        priv->radio_on = radio_on;

        ret = lbs_cmd_with_response(priv, CMD_802_11_RADIO_CONTROL, &cmd);

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

void lbs_set_mac_control(struct lbs_private *priv)
{
        struct cmd_ds_mac_control cmd;

        lbs_deb_enter(LBS_DEB_CMD);

        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(priv->mac_control);
        cmd.reserved = 0;

        lbs_cmd_async(priv, CMD_MAC_CONTROL, &cmd.hdr, sizeof(cmd));

        lbs_deb_leave(LBS_DEB_CMD);
}

/**
 *  @brief This function allocates the command buffer and link
 *  it to command free queue.
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @return             0 or -1
 */
int lbs_allocate_cmd_buffer(struct lbs_private *priv)
{
        int ret = 0;
        u32 bufsize;
        u32 i;
        struct cmd_ctrl_node *cmdarray;

        lbs_deb_enter(LBS_DEB_HOST);

        /* Allocate and initialize the command array */
        bufsize = sizeof(struct cmd_ctrl_node) * LBS_NUM_CMD_BUFFERS;
        if (!(cmdarray = kzalloc(bufsize, GFP_KERNEL))) {
                lbs_deb_host("ALLOC_CMD_BUF: tempcmd_array is NULL\n");
                ret = -1;
                goto done;
        }
        priv->cmd_array = cmdarray;

        /* Allocate and initialize each command buffer in the command array */
        for (i = 0; i < LBS_NUM_CMD_BUFFERS; i++) {
                cmdarray[i].cmdbuf = kzalloc(LBS_CMD_BUFFER_SIZE, GFP_KERNEL);
                if (!cmdarray[i].cmdbuf) {
                        lbs_deb_host("ALLOC_CMD_BUF: ptempvirtualaddr is NULL\n");
                        ret = -1;
                        goto done;
                }
        }

        for (i = 0; i < LBS_NUM_CMD_BUFFERS; i++) {
                init_waitqueue_head(&cmdarray[i].cmdwait_q);
                lbs_cleanup_and_insert_cmd(priv, &cmdarray[i]);
        }
        ret = 0;

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

/**
 *  @brief This function frees the command buffer.
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @return             0 or -1
 */
int lbs_free_cmd_buffer(struct lbs_private *priv)
{
        struct cmd_ctrl_node *cmdarray;
        unsigned int i;

        lbs_deb_enter(LBS_DEB_HOST);

        /* need to check if cmd array is allocated or not */
        if (priv->cmd_array == NULL) {
                lbs_deb_host("FREE_CMD_BUF: cmd_array is NULL\n");
                goto done;
        }

        cmdarray = priv->cmd_array;

        /* Release shared memory buffers */
        for (i = 0; i < LBS_NUM_CMD_BUFFERS; i++) {
                if (cmdarray[i].cmdbuf) {
                        kfree(cmdarray[i].cmdbuf);
                        cmdarray[i].cmdbuf = NULL;
                }
        }

        /* Release cmd_ctrl_node */
        if (priv->cmd_array) {
                kfree(priv->cmd_array);
                priv->cmd_array = NULL;
        }

done:
        lbs_deb_leave(LBS_DEB_HOST);
        return 0;
}

/**
 *  @brief This function gets a free command node if available in
 *  command free queue.
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @return cmd_ctrl_node A pointer to cmd_ctrl_node structure or NULL
 */
static struct cmd_ctrl_node *lbs_get_free_cmd_node(struct lbs_private *priv)
{
        struct cmd_ctrl_node *tempnode;
        unsigned long flags;

        lbs_deb_enter(LBS_DEB_HOST);

        if (!priv)
                return NULL;

        spin_lock_irqsave(&priv->driver_lock, flags);

        if (!list_empty(&priv->cmdfreeq)) {
                tempnode = list_first_entry(&priv->cmdfreeq,
                                            struct cmd_ctrl_node, list);
                list_del(&tempnode->list);
        } else {
                lbs_deb_host("GET_CMD_NODE: cmd_ctrl_node is not available\n");
                tempnode = NULL;
        }

        spin_unlock_irqrestore(&priv->driver_lock, flags);

        lbs_deb_leave(LBS_DEB_HOST);
        return tempnode;
}

/**
 *  @brief This function executes next command in command
 *  pending queue. It will put firmware back to PS mode
 *  if applicable.
 *
 *  @param priv     A pointer to struct lbs_private structure
 *  @return        0 or -1
 */
int lbs_execute_next_command(struct lbs_private *priv)
{
        struct cmd_ctrl_node *cmdnode = NULL;
        struct cmd_header *cmd;
        unsigned long flags;
        int ret = 0;

        /* Debug group is LBS_DEB_THREAD and not LBS_DEB_HOST, because the
         * only caller to us is lbs_thread() and we get even when a
         * data packet is received */
        lbs_deb_enter(LBS_DEB_THREAD);

        spin_lock_irqsave(&priv->driver_lock, flags);

        if (priv->cur_cmd) {
                lbs_pr_alert( "EXEC_NEXT_CMD: already processing command!\n");
                spin_unlock_irqrestore(&priv->driver_lock, flags);
                ret = -1;
                goto done;
        }

        if (!list_empty(&priv->cmdpendingq)) {
                cmdnode = list_first_entry(&priv->cmdpendingq,
                                           struct cmd_ctrl_node, list);
        }

        spin_unlock_irqrestore(&priv->driver_lock, flags);

        if (cmdnode) {
                cmd = cmdnode->cmdbuf;

                if (is_command_allowed_in_ps(le16_to_cpu(cmd->command))) {
                        if ((priv->psstate == PS_STATE_SLEEP) ||
                            (priv->psstate == PS_STATE_PRE_SLEEP)) {
                                lbs_deb_host(
                                       "EXEC_NEXT_CMD: cannot send cmd 0x%04x in psstate %d\n",
                                       le16_to_cpu(cmd->command),
                                       priv->psstate);
                                ret = -1;
                                goto done;
                        }
                        lbs_deb_host("EXEC_NEXT_CMD: OK to send command "
                                     "0x%04x in psstate %d\n",
                                     le16_to_cpu(cmd->command), priv->psstate);
                } else if (priv->psstate != PS_STATE_FULL_POWER) {
                        /*
                         * 1. Non-PS command:
                         * Queue it. set needtowakeup to TRUE if current state
                         * is SLEEP, otherwise call send EXIT_PS.
                         * 2. PS command but not EXIT_PS:
                         * Ignore it.
                         * 3. PS command EXIT_PS:
                         * Set needtowakeup to TRUE if current state is SLEEP,
                         * otherwise send this command down to firmware
                         * immediately.
                         */
                        if (cmd->command != cpu_to_le16(CMD_802_11_PS_MODE)) {
                                /*  Prepare to send Exit PS,
                                 *  this non PS command will be sent later */
                                if ((priv->psstate == PS_STATE_SLEEP)
                                    || (priv->psstate == PS_STATE_PRE_SLEEP)
                                    ) {
                                        /* w/ new scheme, it will not reach here.
                                           since it is blocked in main_thread. */
                                        priv->needtowakeup = 1;
                                } else {
                                        lbs_set_ps_mode(priv,
                                                        PS_MODE_ACTION_EXIT_PS,
                                                        false);
                                }

                                ret = 0;
                                goto done;
                        } else {
                                /*
                                 * PS command. Ignore it if it is not Exit_PS.
                                 * otherwise send it down immediately.
                                 */
                                struct cmd_ds_802_11_ps_mode *psm = (void *)&cmd[1];

                                lbs_deb_host(
                                       "EXEC_NEXT_CMD: PS cmd, action 0x%02x\n",
                                       psm->action);
                                if (psm->action !=
                                    cpu_to_le16(PS_MODE_ACTION_EXIT_PS)) {
                                        lbs_deb_host(
                                               "EXEC_NEXT_CMD: ignore ENTER_PS cmd\n");
                                        spin_lock_irqsave(&priv->driver_lock, flags);
                                        list_del(&cmdnode->list);
                                        lbs_complete_command(priv, cmdnode, 0);
                                        spin_unlock_irqrestore(&priv->driver_lock, flags);

                                        ret = 0;
                                        goto done;
                                }

                                if ((priv->psstate == PS_STATE_SLEEP) ||
                                    (priv->psstate == PS_STATE_PRE_SLEEP)) {
                                        lbs_deb_host(
                                               "EXEC_NEXT_CMD: ignore EXIT_PS cmd in sleep\n");
                                        spin_lock_irqsave(&priv->driver_lock, flags);
                                        list_del(&cmdnode->list);
                                        lbs_complete_command(priv, cmdnode, 0);
                                        spin_unlock_irqrestore(&priv->driver_lock, flags);
                                        priv->needtowakeup = 1;

                                        ret = 0;
                                        goto done;
                                }

                                lbs_deb_host(
                                       "EXEC_NEXT_CMD: sending EXIT_PS\n");
                        }
                }
                spin_lock_irqsave(&priv->driver_lock, flags);
                list_del(&cmdnode->list);
                spin_unlock_irqrestore(&priv->driver_lock, flags);
                lbs_deb_host("EXEC_NEXT_CMD: sending command 0x%04x\n",
                            le16_to_cpu(cmd->command));
                lbs_submit_command(priv, cmdnode);
        } else {
                /*
                 * check if in power save mode, if yes, put the device back
                 * to PS mode
                 */
#ifdef TODO
                /*
                 * This was the old code for libertas+wext. Someone that
                 * understands this beast should re-code it in a sane way.
                 *
                 * I actually don't understand why this is related to WPA
                 * and to connection status, shouldn't powering should be
                 * independ of such things?
                 */
                if ((priv->psmode != LBS802_11POWERMODECAM) &&
                    (priv->psstate == PS_STATE_FULL_POWER) &&
                    ((priv->connect_status == LBS_CONNECTED) ||
                    lbs_mesh_connected(priv))) {
                        if (priv->secinfo.WPAenabled ||
                            priv->secinfo.WPA2enabled) {
                                /* check for valid WPA group keys */
                                if (priv->wpa_mcast_key.len ||
                                    priv->wpa_unicast_key.len) {
                                        lbs_deb_host(
                                               "EXEC_NEXT_CMD: WPA enabled and GTK_SET"
                                               " go back to PS_SLEEP");
                                        lbs_set_ps_mode(priv,
                                                        PS_MODE_ACTION_ENTER_PS,
                                                        false);
                                }
                        } else {
                                lbs_deb_host(
                                       "EXEC_NEXT_CMD: cmdpendingq empty, "
                                       "go back to PS_SLEEP");
                                lbs_set_ps_mode(priv, PS_MODE_ACTION_ENTER_PS,
                                                false);
                        }
                }
#endif
        }

        ret = 0;
done:
        lbs_deb_leave(LBS_DEB_THREAD);
        return ret;
}

static void lbs_send_confirmsleep(struct lbs_private *priv)
{
        unsigned long flags;
        int ret;

        lbs_deb_enter(LBS_DEB_HOST);
        lbs_deb_hex(LBS_DEB_HOST, "sleep confirm", (u8 *) &confirm_sleep,
                sizeof(confirm_sleep));

        ret = priv->hw_host_to_card(priv, MVMS_CMD, (u8 *) &confirm_sleep,
                sizeof(confirm_sleep));
        if (ret) {
                lbs_pr_alert("confirm_sleep failed\n");
                goto out;
        }

        spin_lock_irqsave(&priv->driver_lock, flags);

        /* We don't get a response on the sleep-confirmation */
        priv->dnld_sent = DNLD_RES_RECEIVED;

        if (priv->is_host_sleep_configured) {
                priv->is_host_sleep_activated = 1;
                wake_up_interruptible(&priv->host_sleep_q);
        }

        /* If nothing to do, go back to sleep (?) */
        if (!kfifo_len(&priv->event_fifo) && !priv->resp_len[priv->resp_idx])
                priv->psstate = PS_STATE_SLEEP;

        spin_unlock_irqrestore(&priv->driver_lock, flags);

out:
        lbs_deb_leave(LBS_DEB_HOST);
}

/**
 *  @brief This function checks condition and prepares to
 *  send sleep confirm command to firmware if ok.
 *
 *  @param priv         A pointer to struct lbs_private structure
 *  @param psmode       Power Saving mode
 *  @return             n/a
 */
void lbs_ps_confirm_sleep(struct lbs_private *priv)
{
        unsigned long flags =0;
        int allowed = 1;

        lbs_deb_enter(LBS_DEB_HOST);

        spin_lock_irqsave(&priv->driver_lock, flags);
        if (priv->dnld_sent) {
                allowed = 0;
                lbs_deb_host("dnld_sent was set\n");
        }

        /* In-progress command? */
        if (priv->cur_cmd) {
                allowed = 0;
                lbs_deb_host("cur_cmd was set\n");
        }

        /* Pending events or command responses? */
        if (kfifo_len(&priv->event_fifo) || priv->resp_len[priv->resp_idx]) {
                allowed = 0;
                lbs_deb_host("pending events or command responses\n");
        }
        spin_unlock_irqrestore(&priv->driver_lock, flags);

        if (allowed) {
                lbs_deb_host("sending lbs_ps_confirm_sleep\n");
                lbs_send_confirmsleep(priv);
        } else {
                lbs_deb_host("sleep confirm has been delayed\n");
        }

        lbs_deb_leave(LBS_DEB_HOST);
}


/**
 * @brief Configures the transmission power control functionality.
 *
 * @param priv          A pointer to struct lbs_private structure
 * @param enable        Transmission power control enable
 * @param p0            Power level when link quality is good (dBm).
 * @param p1            Power level when link quality is fair (dBm).
 * @param p2            Power level when link quality is poor (dBm).
 * @param usesnr        Use Signal to Noise Ratio in TPC
 *
 * @return 0 on success
 */
int lbs_set_tpc_cfg(struct lbs_private *priv, int enable, int8_t p0, int8_t p1,
                int8_t p2, int usesnr)
{
        struct cmd_ds_802_11_tpc_cfg cmd;
        int ret;

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);
        cmd.enable = !!enable;
        cmd.usesnr = !!usesnr;
        cmd.P0 = p0;
        cmd.P1 = p1;
        cmd.P2 = p2;

        ret = lbs_cmd_with_response(priv, CMD_802_11_TPC_CFG, &cmd);

        return ret;
}

/**
 * @brief Configures the power adaptation settings.
 *
 * @param priv          A pointer to struct lbs_private structure
 * @param enable        Power adaptation enable
 * @param p0            Power level for 1, 2, 5.5 and 11 Mbps (dBm).
 * @param p1            Power level for 6, 9, 12, 18, 22, 24 and 36 Mbps (dBm).
 * @param p2            Power level for 48 and 54 Mbps (dBm).
 *
 * @return 0 on Success
 */

int lbs_set_power_adapt_cfg(struct lbs_private *priv, int enable, int8_t p0,
                int8_t p1, int8_t p2)
{
        struct cmd_ds_802_11_pa_cfg cmd;
        int ret;

        memset(&cmd, 0, sizeof(cmd));
        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
        cmd.action = cpu_to_le16(CMD_ACT_SET);
        cmd.enable = !!enable;
        cmd.P0 = p0;
        cmd.P1 = p1;
        cmd.P2 = p2;

        ret = lbs_cmd_with_response(priv, CMD_802_11_PA_CFG , &cmd);

        return ret;
}


struct cmd_ctrl_node *__lbs_cmd_async(struct lbs_private *priv,
        uint16_t command, struct cmd_header *in_cmd, int in_cmd_size,
        int (*callback)(struct lbs_private *, unsigned long, struct cmd_header *),
        unsigned long callback_arg)
{
        struct cmd_ctrl_node *cmdnode;

        lbs_deb_enter(LBS_DEB_HOST);

        if (priv->surpriseremoved) {
                lbs_deb_host("PREP_CMD: card removed\n");
                cmdnode = ERR_PTR(-ENOENT);
                goto done;
        }

        /* No commands are allowed in Deep Sleep until we toggle the GPIO
         * to wake up the card and it has signaled that it's ready.
         */
        if (!priv->is_auto_deep_sleep_enabled) {
                if (priv->is_deep_sleep) {
                        lbs_deb_cmd("command not allowed in deep sleep\n");
                        cmdnode = ERR_PTR(-EBUSY);
                        goto done;
                }
        }

        cmdnode = lbs_get_free_cmd_node(priv);
        if (cmdnode == NULL) {
                lbs_deb_host("PREP_CMD: cmdnode is NULL\n");

                /* Wake up main thread to execute next command */
                wake_up_interruptible(&priv->waitq);
                cmdnode = ERR_PTR(-ENOBUFS);
                goto done;
        }

        cmdnode->callback = callback;
        cmdnode->callback_arg = callback_arg;

        /* Copy the incoming command to the buffer */
        memcpy(cmdnode->cmdbuf, in_cmd, in_cmd_size);

        /* Set sequence number, clean result, move to buffer */
        priv->seqnum++;
        cmdnode->cmdbuf->command = cpu_to_le16(command);
        cmdnode->cmdbuf->size    = cpu_to_le16(in_cmd_size);
        cmdnode->cmdbuf->seqnum  = cpu_to_le16(priv->seqnum);
        cmdnode->cmdbuf->result  = 0;

        lbs_deb_host("PREP_CMD: command 0x%04x\n", command);

        cmdnode->cmdwaitqwoken = 0;
        lbs_queue_cmd(priv, cmdnode);
        wake_up_interruptible(&priv->waitq);

 done:
        lbs_deb_leave_args(LBS_DEB_HOST, "ret %p", cmdnode);
        return cmdnode;
}

void lbs_cmd_async(struct lbs_private *priv, uint16_t command,
        struct cmd_header *in_cmd, int in_cmd_size)
{
        lbs_deb_enter(LBS_DEB_CMD);
        __lbs_cmd_async(priv, command, in_cmd, in_cmd_size,
                lbs_cmd_async_callback, 0);
        lbs_deb_leave(LBS_DEB_CMD);
}

int __lbs_cmd(struct lbs_private *priv, uint16_t command,
              struct cmd_header *in_cmd, int in_cmd_size,
              int (*callback)(struct lbs_private *, unsigned long, struct cmd_header *),
              unsigned long callback_arg)
{
        struct cmd_ctrl_node *cmdnode;
        unsigned long flags;
        int ret = 0;

        lbs_deb_enter(LBS_DEB_HOST);

        cmdnode = __lbs_cmd_async(priv, command, in_cmd, in_cmd_size,
                                  callback, callback_arg);
        if (IS_ERR(cmdnode)) {
                ret = PTR_ERR(cmdnode);
                goto done;
        }

        might_sleep();
        wait_event_interruptible(cmdnode->cmdwait_q, cmdnode->cmdwaitqwoken);

        spin_lock_irqsave(&priv->driver_lock, flags);
        ret = cmdnode->result;
        if (ret)
                lbs_pr_info("PREP_CMD: command 0x%04x failed: %d\n",
                            command, ret);

        __lbs_cleanup_and_insert_cmd(priv, cmdnode);
        spin_unlock_irqrestore(&priv->driver_lock, flags);

done:
        lbs_deb_leave_args(LBS_DEB_HOST, "ret %d", ret);
        return ret;
}
EXPORT_SYMBOL_GPL(__lbs_cmd);