/*
 * Marvell Wireless LAN device driver: commands and events
 *
 * Copyright (C) 2011-2014, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"
#include "11ac.h"

/*
 * This function initializes a command node.
 *
 * The actual allocation of the node is not done by this function. It only
 * initiates a node by filling it with default parameters. Similarly,
 * allocation of the different buffers used (IOCTL buffer, data buffer) are
 * not done by this function either.
 */
static void
mwifiex_init_cmd_node(struct mwifiex_private *priv,
                      struct cmd_ctrl_node *cmd_node,
                      u32 cmd_oid, void *data_buf, bool sync)
{
        cmd_node->priv = priv;
        cmd_node->cmd_oid = cmd_oid;
        if (sync) {
                cmd_node->wait_q_enabled = true;
                cmd_node->cmd_wait_q_woken = false;
                cmd_node->condition = &cmd_node->cmd_wait_q_woken;
        }
        cmd_node->data_buf = data_buf;
        cmd_node->cmd_skb = cmd_node->skb;
}

/*
 * This function returns a command node from the free queue depending upon
 * availability.
 */
static struct cmd_ctrl_node *
mwifiex_get_cmd_node(struct mwifiex_adapter *adapter)
{
        struct cmd_ctrl_node *cmd_node;
        unsigned long flags;

        spin_lock_irqsave(&adapter->cmd_free_q_lock, flags);
        if (list_empty(&adapter->cmd_free_q)) {
                mwifiex_dbg(adapter, ERROR,
                            "GET_CMD_NODE: cmd node not available\n");
                spin_unlock_irqrestore(&adapter->cmd_free_q_lock, flags);
                return NULL;
        }
        cmd_node = list_first_entry(&adapter->cmd_free_q,
                                    struct cmd_ctrl_node, list);
        list_del(&cmd_node->list);
        spin_unlock_irqrestore(&adapter->cmd_free_q_lock, flags);

        return cmd_node;
}

/*
 * This function cleans up a command node.
 *
 * The function resets the fields including the buffer pointers.
 * This function does not try to free the buffers. They must be
 * freed before calling this function.
 *
 * This function will however call the receive completion callback
 * in case a response buffer is still available before resetting
 * the pointer.
 */
static void
mwifiex_clean_cmd_node(struct mwifiex_adapter *adapter,
                       struct cmd_ctrl_node *cmd_node)
{
        cmd_node->cmd_oid = 0;
        cmd_node->cmd_flag = 0;
        cmd_node->data_buf = NULL;
        cmd_node->wait_q_enabled = false;

        if (cmd_node->cmd_skb)
                skb_trim(cmd_node->cmd_skb, 0);

        if (cmd_node->resp_skb) {
                adapter->if_ops.cmdrsp_complete(adapter, cmd_node->resp_skb);
                cmd_node->resp_skb = NULL;
        }
}

/*
 * This function sends a host command to the firmware.
 *
 * The function copies the host command into the driver command
 * buffer, which will be transferred to the firmware later by the
 * main thread.
 */
static int mwifiex_cmd_host_cmd(struct mwifiex_private *priv,
                                struct host_cmd_ds_command *cmd,
                                struct mwifiex_ds_misc_cmd *pcmd_ptr)
{
        /* Copy the HOST command to command buffer */
        memcpy(cmd, pcmd_ptr->cmd, pcmd_ptr->len);
        mwifiex_dbg(priv->adapter, CMD,
                    "cmd: host cmd size = %d\n", pcmd_ptr->len);
        return 0;
}

/*
 * This function downloads a command to the firmware.
 *
 * The function performs sanity tests, sets the command sequence
 * number and size, converts the header fields to CPU format before
 * sending. Afterwards, it logs the command ID and action for debugging
 * and sets up the command timeout timer.
 */
static int mwifiex_dnld_cmd_to_fw(struct mwifiex_private *priv,
                                  struct cmd_ctrl_node *cmd_node)
{

        struct mwifiex_adapter *adapter = priv->adapter;
        int ret;
        struct host_cmd_ds_command *host_cmd;
        uint16_t cmd_code;
        uint16_t cmd_size;
        unsigned long flags;
        __le32 tmp;

        if (!adapter || !cmd_node)
                return -1;

        host_cmd = (struct host_cmd_ds_command *) (cmd_node->cmd_skb->data);

        /* Sanity test */
        if (host_cmd == NULL || host_cmd->size == 0) {
                mwifiex_dbg(adapter, ERROR,
                            "DNLD_CMD: host_cmd is null\t"
                            "or cmd size is 0, not sending\n");
                if (cmd_node->wait_q_enabled)
                        adapter->cmd_wait_q.status = -1;
                mwifiex_recycle_cmd_node(adapter, cmd_node);
                return -1;
        }

        cmd_code = le16_to_cpu(host_cmd->command);
        cmd_size = le16_to_cpu(host_cmd->size);

        if (adapter->hw_status == MWIFIEX_HW_STATUS_RESET &&
            cmd_code != HostCmd_CMD_FUNC_SHUTDOWN &&
            cmd_code != HostCmd_CMD_FUNC_INIT) {
                mwifiex_dbg(adapter, ERROR,
                            "DNLD_CMD: FW in reset state, ignore cmd %#x\n",
                        cmd_code);
                mwifiex_recycle_cmd_node(adapter, cmd_node);
                queue_work(adapter->workqueue, &adapter->main_work);
                return -1;
        }

        /* Set command sequence number */
        adapter->seq_num++;
        host_cmd->seq_num = cpu_to_le16(HostCmd_SET_SEQ_NO_BSS_INFO
                                        (adapter->seq_num,
                                         cmd_node->priv->bss_num,
                                         cmd_node->priv->bss_type));

        spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
        adapter->curr_cmd = cmd_node;
        spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

        /* Adjust skb length */
        if (cmd_node->cmd_skb->len > cmd_size)
                /*
                 * cmd_size is less than sizeof(struct host_cmd_ds_command).
                 * Trim off the unused portion.
                 */
                skb_trim(cmd_node->cmd_skb, cmd_size);
        else if (cmd_node->cmd_skb->len < cmd_size)
                /*
                 * cmd_size is larger than sizeof(struct host_cmd_ds_command)
                 * because we have appended custom IE TLV. Increase skb length
                 * accordingly.
                 */
                skb_put(cmd_node->cmd_skb, cmd_size - cmd_node->cmd_skb->len);

        mwifiex_dbg(adapter, CMD,
                    "cmd: DNLD_CMD: %#x, act %#x, len %d, seqno %#x\n",
                    cmd_code,
                    le16_to_cpu(*(__le16 *)((u8 *)host_cmd + S_DS_GEN)),
                    cmd_size, le16_to_cpu(host_cmd->seq_num));
        mwifiex_dbg_dump(adapter, CMD_D, "cmd buffer:", host_cmd, cmd_size);

        if (adapter->iface_type == MWIFIEX_USB) {
                tmp = cpu_to_le32(MWIFIEX_USB_TYPE_CMD);
                skb_push(cmd_node->cmd_skb, MWIFIEX_TYPE_LEN);
                memcpy(cmd_node->cmd_skb->data, &tmp, MWIFIEX_TYPE_LEN);
                adapter->cmd_sent = true;
                ret = adapter->if_ops.host_to_card(adapter,
                                                   MWIFIEX_USB_EP_CMD_EVENT,
                                                   cmd_node->cmd_skb, NULL);
                skb_pull(cmd_node->cmd_skb, MWIFIEX_TYPE_LEN);
                if (ret == -EBUSY)
                        cmd_node->cmd_skb = NULL;
        } else {
                skb_push(cmd_node->cmd_skb, INTF_HEADER_LEN);
                ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_CMD,
                                                   cmd_node->cmd_skb, NULL);
                skb_pull(cmd_node->cmd_skb, INTF_HEADER_LEN);
        }

        if (ret == -1) {
                mwifiex_dbg(adapter, ERROR,
                            "DNLD_CMD: host to card failed\n");
                if (adapter->iface_type == MWIFIEX_USB)
                        adapter->cmd_sent = false;
                if (cmd_node->wait_q_enabled)
                        adapter->cmd_wait_q.status = -1;
                mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);

                spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
                adapter->curr_cmd = NULL;
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

                adapter->dbg.num_cmd_host_to_card_failure++;
                return -1;
        }

        /* Save the last command id and action to debug log */
        adapter->dbg.last_cmd_index =
                        (adapter->dbg.last_cmd_index + 1) % DBG_CMD_NUM;
        adapter->dbg.last_cmd_id[adapter->dbg.last_cmd_index] = cmd_code;
        adapter->dbg.last_cmd_act[adapter->dbg.last_cmd_index] =
                        le16_to_cpu(*(__le16 *) ((u8 *) host_cmd + S_DS_GEN));

        /* Clear BSS_NO_BITS from HostCmd */
        cmd_code &= HostCmd_CMD_ID_MASK;

        /* Setup the timer after transmit command */
        mod_timer(&adapter->cmd_timer,
                  jiffies + msecs_to_jiffies(MWIFIEX_TIMER_10S));

        return 0;
}

/*
 * This function downloads a sleep confirm command to the firmware.
 *
 * The function performs sanity tests, sets the command sequence
 * number and size, converts the header fields to CPU format before
 * sending.
 *
 * No responses are needed for sleep confirm command.
 */
static int mwifiex_dnld_sleep_confirm_cmd(struct mwifiex_adapter *adapter)
{
        int ret;
        struct mwifiex_private *priv;
        struct mwifiex_opt_sleep_confirm *sleep_cfm_buf =
                                (struct mwifiex_opt_sleep_confirm *)
                                                adapter->sleep_cfm->data;
        struct sk_buff *sleep_cfm_tmp;
        __le32 tmp;

        priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);

        adapter->seq_num++;
        sleep_cfm_buf->seq_num =
                cpu_to_le16((HostCmd_SET_SEQ_NO_BSS_INFO
                                        (adapter->seq_num, priv->bss_num,
                                         priv->bss_type)));

        mwifiex_dbg(adapter, CMD,
                    "cmd: DNLD_CMD: %#x, act %#x, len %d, seqno %#x\n",
                le16_to_cpu(sleep_cfm_buf->command),
                le16_to_cpu(sleep_cfm_buf->action),
                le16_to_cpu(sleep_cfm_buf->size),
                le16_to_cpu(sleep_cfm_buf->seq_num));
        mwifiex_dbg_dump(adapter, CMD_D, "SLEEP_CFM buffer: ", sleep_cfm_buf,
                         le16_to_cpu(sleep_cfm_buf->size));

        if (adapter->iface_type == MWIFIEX_USB) {
                sleep_cfm_tmp =
                        dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
                                      + MWIFIEX_TYPE_LEN);
                skb_put(sleep_cfm_tmp, sizeof(struct mwifiex_opt_sleep_confirm)
                        + MWIFIEX_TYPE_LEN);
                tmp = cpu_to_le32(MWIFIEX_USB_TYPE_CMD);
                memcpy(sleep_cfm_tmp->data, &tmp, MWIFIEX_TYPE_LEN);
                memcpy(sleep_cfm_tmp->data + MWIFIEX_TYPE_LEN,
                       adapter->sleep_cfm->data,
                       sizeof(struct mwifiex_opt_sleep_confirm));
                ret = adapter->if_ops.host_to_card(adapter,
                                                   MWIFIEX_USB_EP_CMD_EVENT,
                                                   sleep_cfm_tmp, NULL);
                if (ret != -EBUSY)
                        dev_kfree_skb_any(sleep_cfm_tmp);
        } else {
                skb_push(adapter->sleep_cfm, INTF_HEADER_LEN);
                ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_CMD,
                                                   adapter->sleep_cfm, NULL);
                skb_pull(adapter->sleep_cfm, INTF_HEADER_LEN);
        }

        if (ret == -1) {
                mwifiex_dbg(adapter, ERROR, "SLEEP_CFM: failed\n");
                adapter->dbg.num_cmd_sleep_cfm_host_to_card_failure++;
                return -1;
        }

        if (!le16_to_cpu(sleep_cfm_buf->resp_ctrl))
                /* Response is not needed for sleep confirm command */
                adapter->ps_state = PS_STATE_SLEEP;
        else
                adapter->ps_state = PS_STATE_SLEEP_CFM;

        if (!le16_to_cpu(sleep_cfm_buf->resp_ctrl) &&
            (adapter->is_hs_configured &&
             !adapter->sleep_period.period)) {
                adapter->pm_wakeup_card_req = true;
                mwifiex_hs_activated_event(mwifiex_get_priv
                                (adapter, MWIFIEX_BSS_ROLE_ANY), true);
        }

        return ret;
}

/*
 * This function allocates the command buffers and links them to
 * the command free queue.
 *
 * The driver uses a pre allocated number of command buffers, which
 * are created at driver initializations and freed at driver cleanup.
 * Every command needs to obtain a command buffer from this pool before
 * it can be issued. The command free queue lists the command buffers
 * currently free to use, while the command pending queue lists the
 * command buffers already in use and awaiting handling. Command buffers
 * are returned to the free queue after use.
 */
int mwifiex_alloc_cmd_buffer(struct mwifiex_adapter *adapter)
{
        struct cmd_ctrl_node *cmd_array;
        u32 i;

        /* Allocate and initialize struct cmd_ctrl_node */
        cmd_array = kcalloc(MWIFIEX_NUM_OF_CMD_BUFFER,
                            sizeof(struct cmd_ctrl_node), GFP_KERNEL);
        if (!cmd_array)
                return -ENOMEM;

        adapter->cmd_pool = cmd_array;

        /* Allocate and initialize command buffers */
        for (i = 0; i < MWIFIEX_NUM_OF_CMD_BUFFER; i++) {
                cmd_array[i].skb = dev_alloc_skb(MWIFIEX_SIZE_OF_CMD_BUFFER);
                if (!cmd_array[i].skb) {
                        mwifiex_dbg(adapter, ERROR,
                                    "unable to allocate command buffer\n");
                        return -ENOMEM;
                }
        }

        for (i = 0; i < MWIFIEX_NUM_OF_CMD_BUFFER; i++)
                mwifiex_insert_cmd_to_free_q(adapter, &cmd_array[i]);

        return 0;
}

/*
 * This function frees the command buffers.
 *
 * The function calls the completion callback for all the command
 * buffers that still have response buffers associated with them.
 */
int mwifiex_free_cmd_buffer(struct mwifiex_adapter *adapter)
{
        struct cmd_ctrl_node *cmd_array;
        u32 i;

        /* Need to check if cmd pool is allocated or not */
        if (!adapter->cmd_pool) {
                mwifiex_dbg(adapter, FATAL,
                            "info: FREE_CMD_BUF: cmd_pool is null\n");
                return 0;
        }

        cmd_array = adapter->cmd_pool;

        /* Release shared memory buffers */
        for (i = 0; i < MWIFIEX_NUM_OF_CMD_BUFFER; i++) {
                if (cmd_array[i].skb) {
                        mwifiex_dbg(adapter, CMD,
                                    "cmd: free cmd buffer %d\n", i);
                        dev_kfree_skb_any(cmd_array[i].skb);
                }
                if (!cmd_array[i].resp_skb)
                        continue;

                if (adapter->iface_type == MWIFIEX_USB)
                        adapter->if_ops.cmdrsp_complete(adapter,
                                                        cmd_array[i].resp_skb);
                else
                        dev_kfree_skb_any(cmd_array[i].resp_skb);
        }
        /* Release struct cmd_ctrl_node */
        if (adapter->cmd_pool) {
                mwifiex_dbg(adapter, CMD,
                            "cmd: free cmd pool\n");
                kfree(adapter->cmd_pool);
                adapter->cmd_pool = NULL;
        }

        return 0;
}

/*
 * This function handles events generated by firmware.
 *
 * Event body of events received from firmware are not used (though they are
 * saved), only the event ID is used. Some events are re-invoked by
 * the driver, with a new event body.
 *
 * After processing, the function calls the completion callback
 * for cleanup.
 */
int mwifiex_process_event(struct mwifiex_adapter *adapter)
{
        int ret;
        struct mwifiex_private *priv =
                mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
        struct sk_buff *skb = adapter->event_skb;
        u32 eventcause = adapter->event_cause;
        struct mwifiex_rxinfo *rx_info;

        /* Save the last event to debug log */
        adapter->dbg.last_event_index =
                        (adapter->dbg.last_event_index + 1) % DBG_CMD_NUM;
        adapter->dbg.last_event[adapter->dbg.last_event_index] =
                                                        (u16) eventcause;

        /* Get BSS number and corresponding priv */
        priv = mwifiex_get_priv_by_id(adapter, EVENT_GET_BSS_NUM(eventcause),
                                      EVENT_GET_BSS_TYPE(eventcause));
        if (!priv)
                priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);

        /* Clear BSS_NO_BITS from event */
        eventcause &= EVENT_ID_MASK;
        adapter->event_cause = eventcause;

        if (skb) {
                rx_info = MWIFIEX_SKB_RXCB(skb);
                memset(rx_info, 0, sizeof(*rx_info));
                rx_info->bss_num = priv->bss_num;
                rx_info->bss_type = priv->bss_type;
                mwifiex_dbg_dump(adapter, EVT_D, "Event Buf:",
                                 skb->data, skb->len);
        }

        mwifiex_dbg(adapter, EVENT, "EVENT: cause: %#x\n", eventcause);

        if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
                ret = mwifiex_process_uap_event(priv);
        else
                ret = mwifiex_process_sta_event(priv);

        adapter->event_cause = 0;
        adapter->event_skb = NULL;
        adapter->if_ops.event_complete(adapter, skb);

        return ret;
}

/*
 * This function prepares a command and send it to the firmware.
 *
 * Preparation includes -
 *      - Sanity tests to make sure the card is still present or the FW
 *        is not reset
 *      - Getting a new command node from the command free queue
 *      - Initializing the command node for default parameters
 *      - Fill up the non-default parameters and buffer pointers
 *      - Add the command to pending queue
 */
int mwifiex_send_cmd(struct mwifiex_private *priv, u16 cmd_no,
                     u16 cmd_action, u32 cmd_oid, void *data_buf, bool sync)
{
        int ret;
        struct mwifiex_adapter *adapter = priv->adapter;
        struct cmd_ctrl_node *cmd_node;
        struct host_cmd_ds_command *cmd_ptr;

        if (!adapter) {
                pr_err("PREP_CMD: adapter is NULL\n");
                return -1;
        }

        if (adapter->is_suspended) {
                mwifiex_dbg(adapter, ERROR,
                            "PREP_CMD: device in suspended state\n");
                return -1;
        }

        if (adapter->hs_enabling && cmd_no != HostCmd_CMD_802_11_HS_CFG_ENH) {
                mwifiex_dbg(adapter, ERROR,
                            "PREP_CMD: host entering sleep state\n");
                return -1;
        }

        if (adapter->surprise_removed) {
                mwifiex_dbg(adapter, ERROR,
                            "PREP_CMD: card is removed\n");
                return -1;
        }

        if (adapter->is_cmd_timedout) {
                mwifiex_dbg(adapter, ERROR,
                            "PREP_CMD: FW is in bad state\n");
                return -1;
        }

        if (adapter->hw_status == MWIFIEX_HW_STATUS_RESET) {
                if (cmd_no != HostCmd_CMD_FUNC_INIT) {
                        mwifiex_dbg(adapter, ERROR,
                                    "PREP_CMD: FW in reset state\n");
                        return -1;
                }
        }

        /* Get a new command node */
        cmd_node = mwifiex_get_cmd_node(adapter);

        if (!cmd_node) {
                mwifiex_dbg(adapter, ERROR,
                            "PREP_CMD: no free cmd node\n");
                return -1;
        }

        /* Initialize the command node */
        mwifiex_init_cmd_node(priv, cmd_node, cmd_oid, data_buf, sync);

        if (!cmd_node->cmd_skb) {
                mwifiex_dbg(adapter, ERROR,
                            "PREP_CMD: no free cmd buf\n");
                return -1;
        }

        memset(skb_put(cmd_node->cmd_skb, sizeof(struct host_cmd_ds_command)),
               0, sizeof(struct host_cmd_ds_command));

        cmd_ptr = (struct host_cmd_ds_command *) (cmd_node->cmd_skb->data);
        cmd_ptr->command = cpu_to_le16(cmd_no);
        cmd_ptr->result = 0;

        /* Prepare command */
        if (cmd_no) {
                switch (cmd_no) {
                case HostCmd_CMD_UAP_SYS_CONFIG:
                case HostCmd_CMD_UAP_BSS_START:
                case HostCmd_CMD_UAP_BSS_STOP:
                case HostCmd_CMD_UAP_STA_DEAUTH:
                case HOST_CMD_APCMD_SYS_RESET:
                case HOST_CMD_APCMD_STA_LIST:
                        ret = mwifiex_uap_prepare_cmd(priv, cmd_no, cmd_action,
                                                      cmd_oid, data_buf,
                                                      cmd_ptr);
                        break;
                default:
                        ret = mwifiex_sta_prepare_cmd(priv, cmd_no, cmd_action,
                                                      cmd_oid, data_buf,
                                                      cmd_ptr);
                        break;
                }
        } else {
                ret = mwifiex_cmd_host_cmd(priv, cmd_ptr, data_buf);
                cmd_node->cmd_flag |= CMD_F_HOSTCMD;
        }

        /* Return error, since the command preparation failed */
        if (ret) {
                mwifiex_dbg(adapter, ERROR,
                            "PREP_CMD: cmd %#x preparation failed\n",
                        cmd_no);
                mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
                return -1;
        }

        /* Send command */
        if (cmd_no == HostCmd_CMD_802_11_SCAN ||
            cmd_no == HostCmd_CMD_802_11_SCAN_EXT) {
                mwifiex_queue_scan_cmd(priv, cmd_node);
        } else {
                mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
                queue_work(adapter->workqueue, &adapter->main_work);
                if (cmd_node->wait_q_enabled)
                        ret = mwifiex_wait_queue_complete(adapter, cmd_node);
        }

        return ret;
}

/*
 * This function returns a command to the command free queue.
 *
 * The function also calls the completion callback if required, before
 * cleaning the command node and re-inserting it into the free queue.
 */
void
mwifiex_insert_cmd_to_free_q(struct mwifiex_adapter *adapter,
                             struct cmd_ctrl_node *cmd_node)
{
        unsigned long flags;

        if (!cmd_node)
                return;

        if (cmd_node->wait_q_enabled)
                mwifiex_complete_cmd(adapter, cmd_node);
        /* Clean the node */
        mwifiex_clean_cmd_node(adapter, cmd_node);

        /* Insert node into cmd_free_q */
        spin_lock_irqsave(&adapter->cmd_free_q_lock, flags);
        list_add_tail(&cmd_node->list, &adapter->cmd_free_q);
        spin_unlock_irqrestore(&adapter->cmd_free_q_lock, flags);
}

/* This function reuses a command node. */
void mwifiex_recycle_cmd_node(struct mwifiex_adapter *adapter,
                              struct cmd_ctrl_node *cmd_node)
{
        struct host_cmd_ds_command *host_cmd = (void *)cmd_node->cmd_skb->data;

        mwifiex_insert_cmd_to_free_q(adapter, cmd_node);

        atomic_dec(&adapter->cmd_pending);
        mwifiex_dbg(adapter, CMD,
                    "cmd: FREE_CMD: cmd=%#x, cmd_pending=%d\n",
                le16_to_cpu(host_cmd->command),
                atomic_read(&adapter->cmd_pending));
}

/*
 * This function queues a command to the command pending queue.
 *
 * This in effect adds the command to the command list to be executed.
 * Exit PS command is handled specially, by placing it always to the
 * front of the command queue.
 */
void
mwifiex_insert_cmd_to_pending_q(struct mwifiex_adapter *adapter,
                                struct cmd_ctrl_node *cmd_node, u32 add_tail)
{
        struct host_cmd_ds_command *host_cmd = NULL;
        u16 command;
        unsigned long flags;

        host_cmd = (struct host_cmd_ds_command *) (cmd_node->cmd_skb->data);
        if (!host_cmd) {
                mwifiex_dbg(adapter, ERROR, "QUEUE_CMD: host_cmd is NULL\n");
                return;
        }

        command = le16_to_cpu(host_cmd->command);

        /* Exit_PS command needs to be queued in the header always. */
        if (command == HostCmd_CMD_802_11_PS_MODE_ENH) {
                struct host_cmd_ds_802_11_ps_mode_enh *pm =
                                                &host_cmd->params.psmode_enh;
                if ((le16_to_cpu(pm->action) == DIS_PS) ||
                    (le16_to_cpu(pm->action) == DIS_AUTO_PS)) {
                        if (adapter->ps_state != PS_STATE_AWAKE)
                                add_tail = false;
                }
        }

        spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
        if (add_tail)
                list_add_tail(&cmd_node->list, &adapter->cmd_pending_q);
        else
                list_add(&cmd_node->list, &adapter->cmd_pending_q);
        spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);

        atomic_inc(&adapter->cmd_pending);
        mwifiex_dbg(adapter, CMD,
                    "cmd: QUEUE_CMD: cmd=%#x, cmd_pending=%d\n",
                command, atomic_read(&adapter->cmd_pending));
}

/*
 * This function executes the next command in command pending queue.
 *
 * This function will fail if a command is already in processing stage,
 * otherwise it will dequeue the first command from the command pending
 * queue and send to the firmware.
 *
 * If the device is currently in host sleep mode, any commands, except the
 * host sleep configuration command will de-activate the host sleep. For PS
 * mode, the function will put the firmware back to sleep if applicable.
 */
int mwifiex_exec_next_cmd(struct mwifiex_adapter *adapter)
{
        struct mwifiex_private *priv;
        struct cmd_ctrl_node *cmd_node;
        int ret = 0;
        struct host_cmd_ds_command *host_cmd;
        unsigned long cmd_flags;
        unsigned long cmd_pending_q_flags;

        /* Check if already in processing */
        if (adapter->curr_cmd) {
                mwifiex_dbg(adapter, FATAL,
                            "EXEC_NEXT_CMD: cmd in processing\n");
                return -1;
        }

        spin_lock_irqsave(&adapter->mwifiex_cmd_lock, cmd_flags);
        /* Check if any command is pending */
        spin_lock_irqsave(&adapter->cmd_pending_q_lock, cmd_pending_q_flags);
        if (list_empty(&adapter->cmd_pending_q)) {
                spin_unlock_irqrestore(&adapter->cmd_pending_q_lock,
                                       cmd_pending_q_flags);
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);
                return 0;
        }
        cmd_node = list_first_entry(&adapter->cmd_pending_q,
                                    struct cmd_ctrl_node, list);
        spin_unlock_irqrestore(&adapter->cmd_pending_q_lock,
                               cmd_pending_q_flags);

        host_cmd = (struct host_cmd_ds_command *) (cmd_node->cmd_skb->data);
        priv = cmd_node->priv;

        if (adapter->ps_state != PS_STATE_AWAKE) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: cannot send cmd in sleep state,\t"
                            "this should not happen\n", __func__);
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);
                return ret;
        }

        spin_lock_irqsave(&adapter->cmd_pending_q_lock, cmd_pending_q_flags);
        list_del(&cmd_node->list);
        spin_unlock_irqrestore(&adapter->cmd_pending_q_lock,
                               cmd_pending_q_flags);

        spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);
        ret = mwifiex_dnld_cmd_to_fw(priv, cmd_node);
        priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
        /* Any command sent to the firmware when host is in sleep
         * mode should de-configure host sleep. We should skip the
         * host sleep configuration command itself though
         */
        if (priv && (host_cmd->command !=
             cpu_to_le16(HostCmd_CMD_802_11_HS_CFG_ENH))) {
                if (adapter->hs_activated) {
                        adapter->is_hs_configured = false;
                        mwifiex_hs_activated_event(priv, false);
                }
        }

        return ret;
}

/*
 * This function handles the command response.
 *
 * After processing, the function cleans the command node and puts
 * it back to the command free queue.
 */
int mwifiex_process_cmdresp(struct mwifiex_adapter *adapter)
{
        struct host_cmd_ds_command *resp;
        struct mwifiex_private *priv =
                mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
        int ret = 0;
        uint16_t orig_cmdresp_no;
        uint16_t cmdresp_no;
        uint16_t cmdresp_result;
        unsigned long flags;

        /* Now we got response from FW, cancel the command timer */
        del_timer_sync(&adapter->cmd_timer);

        if (!adapter->curr_cmd || !adapter->curr_cmd->resp_skb) {
                resp = (struct host_cmd_ds_command *) adapter->upld_buf;
                mwifiex_dbg(adapter, ERROR,
                            "CMD_RESP: NULL curr_cmd, %#x\n",
                            le16_to_cpu(resp->command));
                return -1;
        }

        adapter->is_cmd_timedout = 0;

        resp = (struct host_cmd_ds_command *) adapter->curr_cmd->resp_skb->data;
        if (adapter->curr_cmd->cmd_flag & CMD_F_HOSTCMD) {
                /* Copy original response back to response buffer */
                struct mwifiex_ds_misc_cmd *hostcmd;
                uint16_t size = le16_to_cpu(resp->size);
                mwifiex_dbg(adapter, INFO,
                            "info: host cmd resp size = %d\n", size);
                size = min_t(u16, size, MWIFIEX_SIZE_OF_CMD_BUFFER);
                if (adapter->curr_cmd->data_buf) {
                        hostcmd = adapter->curr_cmd->data_buf;
                        hostcmd->len = size;
                        memcpy(hostcmd->cmd, resp, size);
                }
        }
        orig_cmdresp_no = le16_to_cpu(resp->command);

        /* Get BSS number and corresponding priv */
        priv = mwifiex_get_priv_by_id(adapter,
                             HostCmd_GET_BSS_NO(le16_to_cpu(resp->seq_num)),
                             HostCmd_GET_BSS_TYPE(le16_to_cpu(resp->seq_num)));
        if (!priv)
                priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
        /* Clear RET_BIT from HostCmd */
        resp->command = cpu_to_le16(orig_cmdresp_no & HostCmd_CMD_ID_MASK);

        cmdresp_no = le16_to_cpu(resp->command);
        cmdresp_result = le16_to_cpu(resp->result);

        /* Save the last command response to debug log */
        adapter->dbg.last_cmd_resp_index =
                        (adapter->dbg.last_cmd_resp_index + 1) % DBG_CMD_NUM;
        adapter->dbg.last_cmd_resp_id[adapter->dbg.last_cmd_resp_index] =
                                                                orig_cmdresp_no;

        mwifiex_dbg(adapter, CMD,
                    "cmd: CMD_RESP: 0x%x, result %d, len %d, seqno 0x%x\n",
                    orig_cmdresp_no, cmdresp_result,
                    le16_to_cpu(resp->size), le16_to_cpu(resp->seq_num));
        mwifiex_dbg_dump(adapter, CMD_D, "CMD_RESP buffer:", resp,
                         le16_to_cpu(resp->size));

        if (!(orig_cmdresp_no & HostCmd_RET_BIT)) {
                mwifiex_dbg(adapter, ERROR, "CMD_RESP: invalid cmd resp\n");
                if (adapter->curr_cmd->wait_q_enabled)
                        adapter->cmd_wait_q.status = -1;

                mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
                spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
                adapter->curr_cmd = NULL;
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
                return -1;
        }

        if (adapter->curr_cmd->cmd_flag & CMD_F_HOSTCMD) {
                adapter->curr_cmd->cmd_flag &= ~CMD_F_HOSTCMD;
                if ((cmdresp_result == HostCmd_RESULT_OK) &&
                    (cmdresp_no == HostCmd_CMD_802_11_HS_CFG_ENH))
                        ret = mwifiex_ret_802_11_hs_cfg(priv, resp);
        } else {
                /* handle response */
                ret = mwifiex_process_sta_cmdresp(priv, cmdresp_no, resp);
        }

        /* Check init command response */
        if (adapter->hw_status == MWIFIEX_HW_STATUS_INITIALIZING) {
                if (ret) {
                        mwifiex_dbg(adapter, ERROR,
                                    "%s: cmd %#x failed during\t"
                                    "initialization\n", __func__, cmdresp_no);
                        mwifiex_init_fw_complete(adapter);
                        return -1;
                } else if (adapter->last_init_cmd == cmdresp_no)
                        adapter->hw_status = MWIFIEX_HW_STATUS_INIT_DONE;
        }

        if (adapter->curr_cmd) {
                if (adapter->curr_cmd->wait_q_enabled)
                        adapter->cmd_wait_q.status = ret;

                mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);

                spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
                adapter->curr_cmd = NULL;
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
        }

        return ret;
}

/*
 * This function handles the timeout of command sending.
 *
 * It will re-send the same command again.
 */
void
mwifiex_cmd_timeout_func(unsigned long function_context)
{
        struct mwifiex_adapter *adapter =
                (struct mwifiex_adapter *) function_context;
        struct cmd_ctrl_node *cmd_node;

        adapter->is_cmd_timedout = 1;
        if (!adapter->curr_cmd) {
                mwifiex_dbg(adapter, ERROR,
                            "cmd: empty curr_cmd\n");
                return;
        }
        cmd_node = adapter->curr_cmd;
        if (cmd_node) {
                adapter->dbg.timeout_cmd_id =
                        adapter->dbg.last_cmd_id[adapter->dbg.last_cmd_index];
                adapter->dbg.timeout_cmd_act =
                        adapter->dbg.last_cmd_act[adapter->dbg.last_cmd_index];
                mwifiex_dbg(adapter, MSG,
                            "%s: Timeout cmd id = %#x, act = %#x\n", __func__,
                            adapter->dbg.timeout_cmd_id,
                            adapter->dbg.timeout_cmd_act);

                mwifiex_dbg(adapter, MSG,
                            "num_data_h2c_failure = %d\n",
                            adapter->dbg.num_tx_host_to_card_failure);
                mwifiex_dbg(adapter, MSG,
                            "num_cmd_h2c_failure = %d\n",
                            adapter->dbg.num_cmd_host_to_card_failure);

                mwifiex_dbg(adapter, MSG,
                            "is_cmd_timedout = %d\n",
                            adapter->is_cmd_timedout);
                mwifiex_dbg(adapter, MSG,
                            "num_tx_timeout = %d\n",
                            adapter->dbg.num_tx_timeout);

                mwifiex_dbg(adapter, MSG,
                            "last_cmd_index = %d\n",
                            adapter->dbg.last_cmd_index);
                mwifiex_dbg(adapter, MSG,
                            "last_cmd_id: %*ph\n",
                            (int)sizeof(adapter->dbg.last_cmd_id),
                            adapter->dbg.last_cmd_id);
                mwifiex_dbg(adapter, MSG,
                            "last_cmd_act: %*ph\n",
                            (int)sizeof(adapter->dbg.last_cmd_act),
                            adapter->dbg.last_cmd_act);

                mwifiex_dbg(adapter, MSG,
                            "last_cmd_resp_index = %d\n",
                            adapter->dbg.last_cmd_resp_index);
                mwifiex_dbg(adapter, MSG,
                            "last_cmd_resp_id: %*ph\n",
                            (int)sizeof(adapter->dbg.last_cmd_resp_id),
                            adapter->dbg.last_cmd_resp_id);

                mwifiex_dbg(adapter, MSG,
                            "last_event_index = %d\n",
                            adapter->dbg.last_event_index);
                mwifiex_dbg(adapter, MSG,
                            "last_event: %*ph\n",
                            (int)sizeof(adapter->dbg.last_event),
                            adapter->dbg.last_event);

                mwifiex_dbg(adapter, MSG,
                            "data_sent=%d cmd_sent=%d\n",
                            adapter->data_sent, adapter->cmd_sent);

                mwifiex_dbg(adapter, MSG,
                            "ps_mode=%d ps_state=%d\n",
                            adapter->ps_mode, adapter->ps_state);

                if (cmd_node->wait_q_enabled) {
                        adapter->cmd_wait_q.status = -ETIMEDOUT;
                        mwifiex_cancel_pending_ioctl(adapter);
                }
        }
        if (adapter->hw_status == MWIFIEX_HW_STATUS_INITIALIZING) {
                mwifiex_init_fw_complete(adapter);
                return;
        }

        if (adapter->if_ops.device_dump)
                adapter->if_ops.device_dump(adapter);

        if (adapter->if_ops.card_reset)
                adapter->if_ops.card_reset(adapter);
}

/*
 * This function cancels all the pending commands.
 *
 * The current command, all commands in command pending queue and all scan
 * commands in scan pending queue are cancelled. All the completion callbacks
 * are called with failure status to ensure cleanup.
 */

void
mwifiex_cancel_all_pending_cmd(struct mwifiex_adapter *adapter)
{
        struct cmd_ctrl_node *cmd_node = NULL, *tmp_node;
        unsigned long flags, cmd_flags;
        struct mwifiex_private *priv;
        int i;

        spin_lock_irqsave(&adapter->mwifiex_cmd_lock, cmd_flags);
        /* Cancel current cmd */
        if ((adapter->curr_cmd) && (adapter->curr_cmd->wait_q_enabled)) {
                adapter->curr_cmd->wait_q_enabled = false;
                adapter->cmd_wait_q.status = -1;
                mwifiex_complete_cmd(adapter, adapter->curr_cmd);
                /* no recycle probably wait for response */
        }
        /* Cancel all pending command */
        spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
        list_for_each_entry_safe(cmd_node, tmp_node,
                                 &adapter->cmd_pending_q, list) {
                list_del(&cmd_node->list);
                spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);

                if (cmd_node->wait_q_enabled)
                        adapter->cmd_wait_q.status = -1;
                mwifiex_recycle_cmd_node(adapter, cmd_node);
                spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
        }
        spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
        spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);

        /* Cancel all pending scan command */
        spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
        list_for_each_entry_safe(cmd_node, tmp_node,
                                 &adapter->scan_pending_q, list) {
                list_del(&cmd_node->list);

                cmd_node->wait_q_enabled = false;
                mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
        }
        spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);

        if (adapter->scan_processing) {
                spin_lock_irqsave(&adapter->mwifiex_cmd_lock, cmd_flags);
                adapter->scan_processing = false;
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);
                for (i = 0; i < adapter->priv_num; i++) {
                        priv = adapter->priv[i];
                        if (!priv)
                                continue;
                        if (priv->scan_request) {
                                mwifiex_dbg(adapter, WARN, "info: aborting scan\n");
                                cfg80211_scan_done(priv->scan_request, 1);
                                priv->scan_request = NULL;
                        }
                }
        }
}

/*
 * This function cancels all pending commands that matches with
 * the given IOCTL request.
 *
 * Both the current command buffer and the pending command queue are
 * searched for matching IOCTL request. The completion callback of
 * the matched command is called with failure status to ensure cleanup.
 * In case of scan commands, all pending commands in scan pending queue
 * are cancelled.
 */
void
mwifiex_cancel_pending_ioctl(struct mwifiex_adapter *adapter)
{
        struct cmd_ctrl_node *cmd_node = NULL, *tmp_node = NULL;
        unsigned long cmd_flags;
        unsigned long scan_pending_q_flags;
        struct mwifiex_private *priv;
        int i;

        if ((adapter->curr_cmd) &&
            (adapter->curr_cmd->wait_q_enabled)) {
                spin_lock_irqsave(&adapter->mwifiex_cmd_lock, cmd_flags);
                cmd_node = adapter->curr_cmd;
                /* setting curr_cmd to NULL is quite dangerous, because
                 * mwifiex_process_cmdresp checks curr_cmd to be != NULL
                 * at the beginning then relies on it and dereferences
                 * it at will
                 * this probably works since mwifiex_cmd_timeout_func
                 * is the only caller of this function and responses
                 * at that point
                 */
                adapter->curr_cmd = NULL;
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);

                mwifiex_recycle_cmd_node(adapter, cmd_node);
        }

        /* Cancel all pending scan command */
        spin_lock_irqsave(&adapter->scan_pending_q_lock,
                          scan_pending_q_flags);
        list_for_each_entry_safe(cmd_node, tmp_node,
                                 &adapter->scan_pending_q, list) {
                list_del(&cmd_node->list);
                cmd_node->wait_q_enabled = false;
                mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
        }
        spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
                               scan_pending_q_flags);

        if (adapter->scan_processing) {
                spin_lock_irqsave(&adapter->mwifiex_cmd_lock, cmd_flags);
                adapter->scan_processing = false;
                spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);
                for (i = 0; i < adapter->priv_num; i++) {
                        priv = adapter->priv[i];
                        if (!priv)
                                continue;
                        if (priv->scan_request) {
                                mwifiex_dbg(adapter, WARN, "info: aborting scan\n");
                                cfg80211_scan_done(priv->scan_request, 1);
                                priv->scan_request = NULL;
                        }
                }
        }
}

/*
 * This function sends the sleep confirm command to firmware, if
 * possible.
 *
 * The sleep confirm command cannot be issued if command response,
 * data response or event response is awaiting handling, or if we
 * are in the middle of sending a command, or expecting a command
 * response.
 */
void
mwifiex_check_ps_cond(struct mwifiex_adapter *adapter)
{
        if (!adapter->cmd_sent &&
            !adapter->curr_cmd && !IS_CARD_RX_RCVD(adapter))
                mwifiex_dnld_sleep_confirm_cmd(adapter);
        else
                mwifiex_dbg(adapter, CMD,
                            "cmd: Delay Sleep Confirm (%s%s%s)\n",
                            (adapter->cmd_sent) ? "D" : "",
                            (adapter->curr_cmd) ? "C" : "",
                            (IS_CARD_RX_RCVD(adapter)) ? "R" : "");
}

/*
 * This function sends a Host Sleep activated event to applications.
 *
 * This event is generated by the driver, with a blank event body.
 */
void
mwifiex_hs_activated_event(struct mwifiex_private *priv, u8 activated)
{
        if (activated) {
                if (priv->adapter->is_hs_configured) {
                        priv->adapter->hs_activated = true;
                        mwifiex_update_rxreor_flags(priv->adapter,
                                                    RXREOR_FORCE_NO_DROP);
                        mwifiex_dbg(priv->adapter, EVENT,
                                    "event: hs_activated\n");
                        priv->adapter->hs_activate_wait_q_woken = true;
                        wake_up_interruptible(
                                &priv->adapter->hs_activate_wait_q);
                } else {
                        mwifiex_dbg(priv->adapter, EVENT,
                                    "event: HS not configured\n");
                }
        } else {
                mwifiex_dbg(priv->adapter, EVENT,
                            "event: hs_deactivated\n");
                priv->adapter->hs_activated = false;
        }
}

/*
 * This function handles the command response of a Host Sleep configuration
 * command.
 *
 * Handling includes changing the header fields into CPU format
 * and setting the current host sleep activation status in driver.
 *
 * In case host sleep status change, the function generates an event to
 * notify the applications.
 */
int mwifiex_ret_802_11_hs_cfg(struct mwifiex_private *priv,
                              struct host_cmd_ds_command *resp)
{
        struct mwifiex_adapter *adapter = priv->adapter;
        struct host_cmd_ds_802_11_hs_cfg_enh *phs_cfg =
                &resp->params.opt_hs_cfg;
        uint32_t conditions = le32_to_cpu(phs_cfg->params.hs_config.conditions);

        if (phs_cfg->action == cpu_to_le16(HS_ACTIVATE) &&
            adapter->iface_type != MWIFIEX_USB) {
                mwifiex_hs_activated_event(priv, true);
                return 0;
        } else {
                mwifiex_dbg(adapter, CMD,
                            "cmd: CMD_RESP: HS_CFG cmd reply\t"
                            " result=%#x, conditions=0x%x gpio=0x%x gap=0x%x\n",
                            resp->result, conditions,
                            phs_cfg->params.hs_config.gpio,
                            phs_cfg->params.hs_config.gap);
        }
        if (conditions != HS_CFG_CANCEL) {
                adapter->is_hs_configured = true;
                if (adapter->iface_type == MWIFIEX_USB)
                        mwifiex_hs_activated_event(priv, true);
        } else {
                adapter->is_hs_configured = false;
                if (adapter->hs_activated)
                        mwifiex_hs_activated_event(priv, false);
        }

        return 0;
}

/*
 * This function wakes up the adapter and generates a Host Sleep
 * cancel event on receiving the power up interrupt.
 */
void
mwifiex_process_hs_config(struct mwifiex_adapter *adapter)
{
        mwifiex_dbg(adapter, INFO,
                    "info: %s: auto cancelling host sleep\t"
                    "since there is interrupt from the firmware\n",
                    __func__);

        adapter->if_ops.wakeup(adapter);
        adapter->hs_activated = false;
        adapter->is_hs_configured = false;
        adapter->is_suspended = false;
        mwifiex_hs_activated_event(mwifiex_get_priv(adapter,
                                                    MWIFIEX_BSS_ROLE_ANY),
                                   false);
}
EXPORT_SYMBOL_GPL(mwifiex_process_hs_config);

/*
 * This function handles the command response of a sleep confirm command.
 *
 * The function sets the card state to SLEEP if the response indicates success.
 */
void
mwifiex_process_sleep_confirm_resp(struct mwifiex_adapter *adapter,
                                   u8 *pbuf, u32 upld_len)
{
        struct host_cmd_ds_command *cmd = (struct host_cmd_ds_command *) pbuf;
        struct mwifiex_private *priv =
                mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
        uint16_t result = le16_to_cpu(cmd->result);
        uint16_t command = le16_to_cpu(cmd->command);
        uint16_t seq_num = le16_to_cpu(cmd->seq_num);

        if (!upld_len) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: cmd size is 0\n", __func__);
                return;
        }

        mwifiex_dbg(adapter, CMD,
                    "cmd: CMD_RESP: 0x%x, result %d, len %d, seqno 0x%x\n",
                    command, result, le16_to_cpu(cmd->size), seq_num);

        /* Get BSS number and corresponding priv */
        priv = mwifiex_get_priv_by_id(adapter, HostCmd_GET_BSS_NO(seq_num),
                                      HostCmd_GET_BSS_TYPE(seq_num));
        if (!priv)
                priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);

        /* Update sequence number */
        seq_num = HostCmd_GET_SEQ_NO(seq_num);
        /* Clear RET_BIT from HostCmd */
        command &= HostCmd_CMD_ID_MASK;

        if (command != HostCmd_CMD_802_11_PS_MODE_ENH) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: rcvd unexpected resp for cmd %#x, result = %x\n",
                            __func__, command, result);
                return;
        }

        if (result) {
                mwifiex_dbg(adapter, ERROR,
                            "%s: sleep confirm cmd failed\n",
                            __func__);
                adapter->pm_wakeup_card_req = false;
                adapter->ps_state = PS_STATE_AWAKE;
                return;
        }
        adapter->pm_wakeup_card_req = true;
        if (adapter->is_hs_configured)
                mwifiex_hs_activated_event(mwifiex_get_priv
                                                (adapter, MWIFIEX_BSS_ROLE_ANY),
                                           true);
        adapter->ps_state = PS_STATE_SLEEP;
        cmd->command = cpu_to_le16(command);
        cmd->seq_num = cpu_to_le16(seq_num);
}
EXPORT_SYMBOL_GPL(mwifiex_process_sleep_confirm_resp);

/*
 * This function prepares an enhanced power mode command.
 *
 * This function can be used to disable power save or to configure
 * power save with auto PS or STA PS or auto deep sleep.
 *
 * Preparation includes -
 *      - Setting command ID, action and proper size
 *      - Setting Power Save bitmap, PS parameters TLV, PS mode TLV,
 *        auto deep sleep TLV (as required)
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_enh_power_mode(struct mwifiex_private *priv,
                               struct host_cmd_ds_command *cmd,
                               u16 cmd_action, uint16_t ps_bitmap,
                               struct mwifiex_ds_auto_ds *auto_ds)
{
        struct host_cmd_ds_802_11_ps_mode_enh *psmode_enh =
                &cmd->params.psmode_enh;
        u8 *tlv;
        u16 cmd_size = 0;

        cmd->command = cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
        if (cmd_action == DIS_AUTO_PS) {
                psmode_enh->action = cpu_to_le16(DIS_AUTO_PS);
                psmode_enh->params.ps_bitmap = cpu_to_le16(ps_bitmap);
                cmd->size = cpu_to_le16(S_DS_GEN + sizeof(psmode_enh->action) +
                                        sizeof(psmode_enh->params.ps_bitmap));
        } else if (cmd_action == GET_PS) {
                psmode_enh->action = cpu_to_le16(GET_PS);
                psmode_enh->params.ps_bitmap = cpu_to_le16(ps_bitmap);
                cmd->size = cpu_to_le16(S_DS_GEN + sizeof(psmode_enh->action) +
                                        sizeof(psmode_enh->params.ps_bitmap));
        } else if (cmd_action == EN_AUTO_PS) {
                psmode_enh->action = cpu_to_le16(EN_AUTO_PS);
                psmode_enh->params.ps_bitmap = cpu_to_le16(ps_bitmap);
                cmd_size = S_DS_GEN + sizeof(psmode_enh->action) +
                                        sizeof(psmode_enh->params.ps_bitmap);
                tlv = (u8 *) cmd + cmd_size;
                if (ps_bitmap & BITMAP_STA_PS) {
                        struct mwifiex_adapter *adapter = priv->adapter;
                        struct mwifiex_ie_types_ps_param *ps_tlv =
                                (struct mwifiex_ie_types_ps_param *) tlv;
                        struct mwifiex_ps_param *ps_mode = &ps_tlv->param;
                        ps_tlv->header.type = cpu_to_le16(TLV_TYPE_PS_PARAM);
                        ps_tlv->header.len = cpu_to_le16(sizeof(*ps_tlv) -
                                        sizeof(struct mwifiex_ie_types_header));
                        cmd_size += sizeof(*ps_tlv);
                        tlv += sizeof(*ps_tlv);
                        mwifiex_dbg(priv->adapter, CMD,
                                    "cmd: PS Command: Enter PS\n");
                        ps_mode->null_pkt_interval =
                                        cpu_to_le16(adapter->null_pkt_interval);
                        ps_mode->multiple_dtims =
                                        cpu_to_le16(adapter->multiple_dtim);
                        ps_mode->bcn_miss_timeout =
                                        cpu_to_le16(adapter->bcn_miss_time_out);
                        ps_mode->local_listen_interval =
                                cpu_to_le16(adapter->local_listen_interval);
                        ps_mode->adhoc_wake_period =
                                cpu_to_le16(adapter->adhoc_awake_period);
                        ps_mode->delay_to_ps =
                                        cpu_to_le16(adapter->delay_to_ps);
                        ps_mode->mode = cpu_to_le16(adapter->enhanced_ps_mode);

                }
                if (ps_bitmap & BITMAP_AUTO_DS) {
                        struct mwifiex_ie_types_auto_ds_param *auto_ds_tlv =
                                (struct mwifiex_ie_types_auto_ds_param *) tlv;
                        u16 idletime = 0;

                        auto_ds_tlv->header.type =
                                cpu_to_le16(TLV_TYPE_AUTO_DS_PARAM);
                        auto_ds_tlv->header.len =
                                cpu_to_le16(sizeof(*auto_ds_tlv) -
                                        sizeof(struct mwifiex_ie_types_header));
                        cmd_size += sizeof(*auto_ds_tlv);
                        tlv += sizeof(*auto_ds_tlv);
                        if (auto_ds)
                                idletime = auto_ds->idle_time;
                        mwifiex_dbg(priv->adapter, CMD,
                                    "cmd: PS Command: Enter Auto Deep Sleep\n");
                        auto_ds_tlv->deep_sleep_timeout = cpu_to_le16(idletime);
                }
                cmd->size = cpu_to_le16(cmd_size);
        }
        return 0;
}

/*
 * This function handles the command response of an enhanced power mode
 * command.
 *
 * Handling includes changing the header fields into CPU format
 * and setting the current enhanced power mode in driver.
 */
int mwifiex_ret_enh_power_mode(struct mwifiex_private *priv,
                               struct host_cmd_ds_command *resp,
                               struct mwifiex_ds_pm_cfg *pm_cfg)
{
        struct mwifiex_adapter *adapter = priv->adapter;
        struct host_cmd_ds_802_11_ps_mode_enh *ps_mode =
                &resp->params.psmode_enh;
        uint16_t action = le16_to_cpu(ps_mode->action);
        uint16_t ps_bitmap = le16_to_cpu(ps_mode->params.ps_bitmap);
        uint16_t auto_ps_bitmap =
                le16_to_cpu(ps_mode->params.ps_bitmap);

        mwifiex_dbg(adapter, INFO,
                    "info: %s: PS_MODE cmd reply result=%#x action=%#X\n",
                    __func__, resp->result, action);
        if (action == EN_AUTO_PS) {
                if (auto_ps_bitmap & BITMAP_AUTO_DS) {
                        mwifiex_dbg(adapter, CMD,
                                    "cmd: Enabled auto deep sleep\n");
                        priv->adapter->is_deep_sleep = true;
                }
                if (auto_ps_bitmap & BITMAP_STA_PS) {
                        mwifiex_dbg(adapter, CMD,
                                    "cmd: Enabled STA power save\n");
                        if (adapter->sleep_period.period)
                                mwifiex_dbg(adapter, CMD,
                                            "cmd: set to uapsd/pps mode\n");
                }
        } else if (action == DIS_AUTO_PS) {
                if (ps_bitmap & BITMAP_AUTO_DS) {
                        priv->adapter->is_deep_sleep = false;
                        mwifiex_dbg(adapter, CMD,
                                    "cmd: Disabled auto deep sleep\n");
                }
                if (ps_bitmap & BITMAP_STA_PS) {
                        mwifiex_dbg(adapter, CMD,
                                    "cmd: Disabled STA power save\n");
                        if (adapter->sleep_period.period) {
                                adapter->delay_null_pkt = false;
                                adapter->tx_lock_flag = false;
                                adapter->pps_uapsd_mode = false;
                        }
                }
        } else if (action == GET_PS) {
                if (ps_bitmap & BITMAP_STA_PS)
                        adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_PSP;
                else
                        adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;

                mwifiex_dbg(adapter, CMD,
                            "cmd: ps_bitmap=%#x\n", ps_bitmap);

                if (pm_cfg) {
                        /* This section is for get power save mode */
                        if (ps_bitmap & BITMAP_STA_PS)
                                pm_cfg->param.ps_mode = 1;
                        else
                                pm_cfg->param.ps_mode = 0;
                }
        }
        return 0;
}

/*
 * This function prepares command to get hardware specifications.
 *
 * Preparation includes -
 *      - Setting command ID, action and proper size
 *      - Setting permanent address parameter
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_get_hw_spec(struct mwifiex_private *priv,
                            struct host_cmd_ds_command *cmd)
{
        struct host_cmd_ds_get_hw_spec *hw_spec = &cmd->params.hw_spec;

        cmd->command = cpu_to_le16(HostCmd_CMD_GET_HW_SPEC);
        cmd->size =
                cpu_to_le16(sizeof(struct host_cmd_ds_get_hw_spec) + S_DS_GEN);
        memcpy(hw_spec->permanent_addr, priv->curr_addr, ETH_ALEN);

        return 0;
}

/*
 * This function handles the command response of get hardware
 * specifications.
 *
 * Handling includes changing the header fields into CPU format
 * and saving/updating the following parameters in driver -
 *      - Firmware capability information
 *      - Firmware band settings
 *      - Ad-hoc start band and channel
 *      - Ad-hoc 11n activation status
 *      - Firmware release number
 *      - Number of antennas
 *      - Hardware address
 *      - Hardware interface version
 *      - Firmware version
 *      - Region code
 *      - 11n capabilities
 *      - MCS support fields
 *      - MP end port
 */
int mwifiex_ret_get_hw_spec(struct mwifiex_private *priv,
                            struct host_cmd_ds_command *resp)
{
        struct host_cmd_ds_get_hw_spec *hw_spec = &resp->params.hw_spec;
        struct mwifiex_adapter *adapter = priv->adapter;
        struct mwifiex_ie_types_header *tlv;
        struct hw_spec_api_rev *api_rev;
        u16 resp_size, api_id;
        int i, left_len, parsed_len = 0;

        adapter->fw_cap_info = le32_to_cpu(hw_spec->fw_cap_info);

        if (IS_SUPPORT_MULTI_BANDS(adapter))
                adapter->fw_bands = (u8) GET_FW_DEFAULT_BANDS(adapter);
        else
                adapter->fw_bands = BAND_B;

        adapter->config_bands = adapter->fw_bands;

        if (adapter->fw_bands & BAND_A) {
                if (adapter->fw_bands & BAND_GN) {
                        adapter->config_bands |= BAND_AN;
                        adapter->fw_bands |= BAND_AN;
                }
                if (adapter->fw_bands & BAND_AN) {
                        adapter->adhoc_start_band = BAND_A | BAND_AN;
                        adapter->adhoc_11n_enabled = true;
                } else {
                        adapter->adhoc_start_band = BAND_A;
                }
                priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL_A;
        } else if (adapter->fw_bands & BAND_GN) {
                adapter->adhoc_start_band = BAND_G | BAND_B | BAND_GN;
                priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
                adapter->adhoc_11n_enabled = true;
        } else if (adapter->fw_bands & BAND_G) {
                adapter->adhoc_start_band = BAND_G | BAND_B;
                priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
        } else if (adapter->fw_bands & BAND_B) {
                adapter->adhoc_start_band = BAND_B;
                priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
        }

        adapter->fw_release_number = le32_to_cpu(hw_spec->fw_release_number);
        adapter->fw_api_ver = (adapter->fw_release_number >> 16) & 0xff;
        adapter->number_of_antenna = le16_to_cpu(hw_spec->number_of_antenna);

        if (le32_to_cpu(hw_spec->dot_11ac_dev_cap)) {
                adapter->is_hw_11ac_capable = true;

                /* Copy 11AC cap */
                adapter->hw_dot_11ac_dev_cap =
                                        le32_to_cpu(hw_spec->dot_11ac_dev_cap);
                adapter->usr_dot_11ac_dev_cap_bg = adapter->hw_dot_11ac_dev_cap
                                        & ~MWIFIEX_DEF_11AC_CAP_BF_RESET_MASK;
                adapter->usr_dot_11ac_dev_cap_a = adapter->hw_dot_11ac_dev_cap
                                        & ~MWIFIEX_DEF_11AC_CAP_BF_RESET_MASK;

                /* Copy 11AC mcs */
                adapter->hw_dot_11ac_mcs_support =
                                le32_to_cpu(hw_spec->dot_11ac_mcs_support);
                adapter->usr_dot_11ac_mcs_support =
                                        adapter->hw_dot_11ac_mcs_support;
        } else {
                adapter->is_hw_11ac_capable = false;
        }

        resp_size = le16_to_cpu(resp->size) - S_DS_GEN;
        if (resp_size > sizeof(struct host_cmd_ds_get_hw_spec)) {
                /* we have variable HW SPEC information */
                left_len = resp_size - sizeof(struct host_cmd_ds_get_hw_spec);
                while (left_len > sizeof(struct mwifiex_ie_types_header)) {
                        tlv = (void *)&hw_spec->tlvs + parsed_len;
                        switch (le16_to_cpu(tlv->type)) {
                        case TLV_TYPE_API_REV:
                                api_rev = (struct hw_spec_api_rev *)tlv;
                                api_id = le16_to_cpu(api_rev->api_id);
                                switch (api_id) {
                                case KEY_API_VER_ID:
                                        adapter->key_api_major_ver =
                                                        api_rev->major_ver;
                                        adapter->key_api_minor_ver =
                                                        api_rev->minor_ver;
                                        mwifiex_dbg(adapter, INFO,
                                                    "key_api v%d.%d\n",
                                                    adapter->key_api_major_ver,
                                                    adapter->key_api_minor_ver);
                                        break;
                                case FW_API_VER_ID:
                                        adapter->fw_api_ver =
                                                        api_rev->major_ver;
                                        mwifiex_dbg(adapter, INFO,
                                                    "Firmware api version %d\n",
                                                    adapter->fw_api_ver);
                                        break;
                                default:
                                        mwifiex_dbg(adapter, FATAL,
                                                    "Unknown api_id: %d\n",
                                                    api_id);
                                        break;
                                }
                                break;
                        default:
                                mwifiex_dbg(adapter, FATAL,
                                            "Unknown GET_HW_SPEC TLV type: %#x\n",
                                            le16_to_cpu(tlv->type));
                                break;
                        }
                        parsed_len += le16_to_cpu(tlv->len) +
                                      sizeof(struct mwifiex_ie_types_header);
                        left_len -= le16_to_cpu(tlv->len) +
                                      sizeof(struct mwifiex_ie_types_header);
                }
        }

        mwifiex_dbg(adapter, INFO,
                    "info: GET_HW_SPEC: fw_release_number- %#x\n",
                    adapter->fw_release_number);
        mwifiex_dbg(adapter, INFO,
                    "info: GET_HW_SPEC: permanent addr: %pM\n",
                    hw_spec->permanent_addr);
        mwifiex_dbg(adapter, INFO,
                    "info: GET_HW_SPEC: hw_if_version=%#x version=%#x\n",
                    le16_to_cpu(hw_spec->hw_if_version),
                    le16_to_cpu(hw_spec->version));

        ether_addr_copy(priv->adapter->perm_addr, hw_spec->permanent_addr);
        adapter->region_code = le16_to_cpu(hw_spec->region_code);

        for (i = 0; i < MWIFIEX_MAX_REGION_CODE; i++)
                /* Use the region code to search for the index */
                if (adapter->region_code == region_code_index[i])
                        break;

        /* If it's unidentified region code, use the default (USA) */
        if (i >= MWIFIEX_MAX_REGION_CODE) {
                adapter->region_code = 0x10;
                mwifiex_dbg(adapter, WARN,
                            "cmd: unknown region code, use default (USA)\n");
        }

        adapter->hw_dot_11n_dev_cap = le32_to_cpu(hw_spec->dot_11n_dev_cap);
        adapter->hw_dev_mcs_support = hw_spec->dev_mcs_support;
        adapter->user_dev_mcs_support = adapter->hw_dev_mcs_support;

        if (adapter->if_ops.update_mp_end_port)
                adapter->if_ops.update_mp_end_port(adapter,
                                        le16_to_cpu(hw_spec->mp_end_port));

        if (adapter->fw_api_ver == MWIFIEX_FW_V15)
                adapter->scan_chan_gap_enabled = true;

        return 0;
}