/*
 *
 * Intel Management Engine Interface (Intel MEI) Linux driver
 * Copyright (c) 2003-2011, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/delay.h>

#include "mei_dev.h"
#include "hw.h"
#include "interface.h"
#include "mei.h"

const uuid_le mei_amthi_guid  = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, 0xac,
                                                0xa8, 0x46, 0xe0, 0xff, 0x65,
                                                0x81, 0x4c);

/**
 * mei_initialize_list - Sets up a queue list.
 *
 * @list: An instance of our list structure
 * @dev: the device structure
 */
void mei_initialize_list(struct mei_io_list *list, struct mei_device *dev)
{
        /* initialize our queue list */
        INIT_LIST_HEAD(&list->mei_cb.cb_list);
        list->status = 0;
        list->device_extension = dev;
}

/**
 * mei_flush_queues - flushes queue lists belonging to cl.
 *
 * @dev: the device structure
 * @cl: private data of the file object
 */
void mei_flush_queues(struct mei_device *dev, struct mei_cl *cl)
{
        int i;

        if (!dev || !cl)
                return;

        for (i = 0; i < MEI_IO_LISTS_NUMBER; i++) {
                dev_dbg(&dev->pdev->dev, "remove list entry belonging to cl\n");
                mei_flush_list(dev->io_list_array[i], cl);
        }
}


/**
 * mei_flush_list - removes list entry belonging to cl.
 *
 * @list:  An instance of our list structure
 * @cl: private data of the file object
 */
void mei_flush_list(struct mei_io_list *list, struct mei_cl *cl)
{
        struct mei_cl *cl_tmp;
        struct mei_cl_cb *cb_pos = NULL;
        struct mei_cl_cb *cb_next = NULL;

        if (!list || !cl)
                return;

        if (list->status != 0)
                return;

        if (list_empty(&list->mei_cb.cb_list))
                return;

        list_for_each_entry_safe(cb_pos, cb_next,
                                 &list->mei_cb.cb_list, cb_list) {
                if (cb_pos) {
                        cl_tmp = (struct mei_cl *)
                                cb_pos->file_private;
                        if (cl_tmp &&
                            mei_fe_same_id(cl, cl_tmp))
                                list_del(&cb_pos->cb_list);
                }
        }
}

/**
 * mei_reset_iamthif_params - initializes mei device iamthif
 *
 * @dev: the device structure
 */
static void mei_reset_iamthif_params(struct mei_device *dev)
{
        /* reset iamthif parameters. */
        dev->iamthif_current_cb = NULL;
        dev->iamthif_msg_buf_size = 0;
        dev->iamthif_msg_buf_index = 0;
        dev->iamthif_canceled = 0;
        dev->iamthif_ioctl = 0;
        dev->iamthif_state = MEI_IAMTHIF_IDLE;
        dev->iamthif_timer = 0;
}

/**
 * init_mei_device - allocates and initializes the mei device structure
 *
 * @pdev: The pci device structure
 *
 * returns The mei_device_device pointer on success, NULL on failure.
 */
struct mei_device *init_mei_device(struct pci_dev *pdev)
{
        int i;
        struct mei_device *dev;

        dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL);
        if (!dev)
                return NULL;

        /* setup our list array */
        dev->io_list_array[0] = &dev->read_list;
        dev->io_list_array[1] = &dev->write_list;
        dev->io_list_array[2] = &dev->write_waiting_list;
        dev->io_list_array[3] = &dev->ctrl_wr_list;
        dev->io_list_array[4] = &dev->ctrl_rd_list;
        dev->io_list_array[5] = &dev->amthi_cmd_list;
        dev->io_list_array[6] = &dev->amthi_read_complete_list;
        INIT_LIST_HEAD(&dev->file_list);
        INIT_LIST_HEAD(&dev->wd_cl.link);
        INIT_LIST_HEAD(&dev->iamthif_cl.link);
        mutex_init(&dev->device_lock);
        init_waitqueue_head(&dev->wait_recvd_msg);
        init_waitqueue_head(&dev->wait_stop_wd);
        dev->mei_state = MEI_INITIALIZING;
        dev->iamthif_state = MEI_IAMTHIF_IDLE;
        for (i = 0; i < MEI_IO_LISTS_NUMBER; i++)
                mei_initialize_list(dev->io_list_array[i], dev);
        dev->pdev = pdev;
        return dev;
}

/**
 * mei_hw_init - initializes host and fw to start work.
 *
 * @dev: the device structure
 *
 * returns 0 on success, <0 on failure.
 */
int mei_hw_init(struct mei_device *dev)
{
        int err = 0;
        int ret;

        mutex_lock(&dev->device_lock);

        dev->host_hw_state = mei_hcsr_read(dev);
        dev->me_hw_state = mei_mecsr_read(dev);
        dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
            dev->host_hw_state, dev->me_hw_state);

        /* acknowledge interrupt and stop interupts */
        if ((dev->host_hw_state & H_IS) == H_IS)
                mei_reg_write(dev, H_CSR, dev->host_hw_state);

        dev->recvd_msg = 0;
        dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");

        mei_reset(dev, 1);

        dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
            dev->host_hw_state, dev->me_hw_state);

        /* wait for ME to turn on ME_RDY */
        if (!dev->recvd_msg) {
                mutex_unlock(&dev->device_lock);
                err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
                        dev->recvd_msg, MEI_INTEROP_TIMEOUT);
                mutex_lock(&dev->device_lock);
        }

        if (err <= 0 && !dev->recvd_msg) {
                dev->mei_state = MEI_DISABLED;
                dev_dbg(&dev->pdev->dev,
                        "wait_event_interruptible_timeout failed"
                        "on wait for ME to turn on ME_RDY.\n");
                ret = -ENODEV;
                goto out;
        }

        if (!(((dev->host_hw_state & H_RDY) == H_RDY) &&
              ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) {
                dev->mei_state = MEI_DISABLED;
                dev_dbg(&dev->pdev->dev,
                        "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
                        dev->host_hw_state, dev->me_hw_state);

                if (!(dev->host_hw_state & H_RDY))
                        dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n");

                if (!(dev->me_hw_state & ME_RDY_HRA))
                        dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n");

                printk(KERN_ERR "mei: link layer initialization failed.\n");
                ret = -ENODEV;
                goto out;
        }

        if (dev->version.major_version != HBM_MAJOR_VERSION ||
            dev->version.minor_version != HBM_MINOR_VERSION) {
                dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
                ret = -ENODEV;
                goto out;
        }

        dev->recvd_msg = 0;
        dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
            dev->host_hw_state, dev->me_hw_state);
        dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n");
        dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
        dev_dbg(&dev->pdev->dev, "MEI  start success.\n");
        ret = 0;

out:
        mutex_unlock(&dev->device_lock);
        return ret;
}

/**
 * mei_hw_reset - resets fw via mei csr register.
 *
 * @dev: the device structure
 * @interrupts_enabled: if interrupt should be enabled after reset.
 */
static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled)
{
        dev->host_hw_state |= (H_RST | H_IG);

        if (interrupts_enabled)
                mei_enable_interrupts(dev);
        else
                mei_disable_interrupts(dev);
}

/**
 * mei_reset - resets host and fw.
 *
 * @dev: the device structure
 * @interrupts_enabled: if interrupt should be enabled after reset.
 */
void mei_reset(struct mei_device *dev, int interrupts_enabled)
{
        struct mei_cl *cl_pos = NULL;
        struct mei_cl *cl_next = NULL;
        struct mei_cl_cb *cb_pos = NULL;
        struct mei_cl_cb *cb_next = NULL;
        bool unexpected;

        if (dev->mei_state == MEI_RECOVERING_FROM_RESET) {
                dev->need_reset = 1;
                return;
        }

        unexpected = (dev->mei_state != MEI_INITIALIZING &&
                        dev->mei_state != MEI_DISABLED &&
                        dev->mei_state != MEI_POWER_DOWN &&
                        dev->mei_state != MEI_POWER_UP);

        dev->host_hw_state = mei_hcsr_read(dev);

        dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n",
            dev->host_hw_state);

        mei_hw_reset(dev, interrupts_enabled);

        dev->host_hw_state &= ~H_RST;
        dev->host_hw_state |= H_IG;

        mei_hcsr_set(dev);

        dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n",
            dev->host_hw_state);

        dev->need_reset = 0;

        if (dev->mei_state != MEI_INITIALIZING) {
                if (dev->mei_state != MEI_DISABLED &&
                    dev->mei_state != MEI_POWER_DOWN)
                        dev->mei_state = MEI_RESETING;

                list_for_each_entry_safe(cl_pos,
                                cl_next, &dev->file_list, link) {
                        cl_pos->state = MEI_FILE_DISCONNECTED;
                        cl_pos->mei_flow_ctrl_creds = 0;
                        cl_pos->read_cb = NULL;
                        cl_pos->timer_count = 0;
                }
                /* remove entry if already in list */
                dev_dbg(&dev->pdev->dev, "list del iamthif and wd file list.\n");
                mei_remove_client_from_file_list(dev,
                                dev->wd_cl.host_client_id);

                mei_remove_client_from_file_list(dev,
                                dev->iamthif_cl.host_client_id);

                mei_reset_iamthif_params(dev);
                dev->wd_due_counter = 0;
                dev->extra_write_index = 0;
        }

        dev->num_mei_me_clients = 0;
        dev->rd_msg_hdr = 0;
        dev->stop = 0;
        dev->wd_pending = 0;

        /* update the state of the registers after reset */
        dev->host_hw_state = mei_hcsr_read(dev);
        dev->me_hw_state = mei_mecsr_read(dev);

        dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
            dev->host_hw_state, dev->me_hw_state);

        if (unexpected)
                dev_warn(&dev->pdev->dev, "unexpected reset.\n");

        /* Wake up all readings so they can be interrupted */
        list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
                if (waitqueue_active(&cl_pos->rx_wait)) {
                        dev_dbg(&dev->pdev->dev, "Waking up client!\n");
                        wake_up_interruptible(&cl_pos->rx_wait);
                }
        }
        /* remove all waiting requests */
        if (dev->write_list.status == 0 &&
                !list_empty(&dev->write_list.mei_cb.cb_list)) {
                list_for_each_entry_safe(cb_pos, cb_next,
                                &dev->write_list.mei_cb.cb_list, cb_list) {
                        if (cb_pos) {
                                list_del(&cb_pos->cb_list);
                                mei_free_cb_private(cb_pos);
                                cb_pos = NULL;
                        }
                }
        }
}



/**
 * host_start_message - mei host sends start message.
 *
 * @dev: the device structure
 *
 * returns none.
 */
void host_start_message(struct mei_device *dev)
{
        struct mei_msg_hdr *mei_hdr;
        struct hbm_host_version_request *host_start_req;

        /* host start message */
        mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
        mei_hdr->host_addr = 0;
        mei_hdr->me_addr = 0;
        mei_hdr->length = sizeof(struct hbm_host_version_request);
        mei_hdr->msg_complete = 1;
        mei_hdr->reserved = 0;

        host_start_req =
            (struct hbm_host_version_request *) &dev->wr_msg_buf[1];
        memset(host_start_req, 0, sizeof(struct hbm_host_version_request));
        host_start_req->cmd.cmd = HOST_START_REQ_CMD;
        host_start_req->host_version.major_version = HBM_MAJOR_VERSION;
        host_start_req->host_version.minor_version = HBM_MINOR_VERSION;
        dev->recvd_msg = 0;
        if (!mei_write_message(dev, mei_hdr,
                                       (unsigned char *) (host_start_req),
                                       mei_hdr->length)) {
                dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n");
                dev->mei_state = MEI_RESETING;
                mei_reset(dev, 1);
        }
        dev->init_clients_state = MEI_START_MESSAGE;
        dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
        return ;
}

/**
 * host_enum_clients_message - host sends enumeration client request message.
 *
 * @dev: the device structure
 *
 * returns none.
 */
void host_enum_clients_message(struct mei_device *dev)
{
        struct mei_msg_hdr *mei_hdr;
        struct hbm_host_enum_request *host_enum_req;
        mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
        /* enumerate clients */
        mei_hdr->host_addr = 0;
        mei_hdr->me_addr = 0;
        mei_hdr->length = sizeof(struct hbm_host_enum_request);
        mei_hdr->msg_complete = 1;
        mei_hdr->reserved = 0;

        host_enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1];
        memset(host_enum_req, 0, sizeof(struct hbm_host_enum_request));
        host_enum_req->cmd.cmd = HOST_ENUM_REQ_CMD;
        if (!mei_write_message(dev, mei_hdr,
                               (unsigned char *) (host_enum_req),
                                mei_hdr->length)) {
                dev->mei_state = MEI_RESETING;
                dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
                mei_reset(dev, 1);
        }
        dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE;
        dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
        return ;
}


/**
 * allocate_me_clients_storage - allocates storage for me clients
 *
 * @dev: the device structure
 *
 * returns none.
 */
void allocate_me_clients_storage(struct mei_device *dev)
{
        struct mei_me_client *clients;
        int b;

        /* count how many ME clients we have */
        for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX)
                dev->num_mei_me_clients++;

        if (dev->num_mei_me_clients <= 0)
                return ;


        if (dev->me_clients != NULL) {
                kfree(dev->me_clients);
                dev->me_clients = NULL;
        }
        dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n",
                dev->num_mei_me_clients * sizeof(struct mei_me_client));
        /* allocate storage for ME clients representation */
        clients = kcalloc(dev->num_mei_me_clients,
                        sizeof(struct mei_me_client), GFP_KERNEL);
        if (!clients) {
                dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n");
                dev->mei_state = MEI_RESETING;
                mei_reset(dev, 1);
                return ;
        }
        dev->me_clients = clients;
        return ;
}
/**
 * host_client_properties - reads properties for client
 *
 * @dev: the device structure
 *
 * returns none.
 */
void host_client_properties(struct mei_device *dev)
{
        struct mei_msg_hdr *mei_header;
        struct hbm_props_request *host_cli_req;
        int b;
        u8 client_num = dev->me_client_presentation_num;

        b = dev->me_client_index;
        b = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, b);
        if (b < MEI_CLIENTS_MAX) {
                dev->me_clients[client_num].client_id = b;
                dev->me_clients[client_num].mei_flow_ctrl_creds = 0;
                mei_header = (struct mei_msg_hdr *)&dev->wr_msg_buf[0];
                mei_header->host_addr = 0;
                mei_header->me_addr = 0;
                mei_header->length = sizeof(struct hbm_props_request);
                mei_header->msg_complete = 1;
                mei_header->reserved = 0;

                host_cli_req = (struct hbm_props_request *)&dev->wr_msg_buf[1];

                memset(host_cli_req, 0, sizeof(struct hbm_props_request));

                host_cli_req->cmd.cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
                host_cli_req->address = b;

                if (!mei_write_message(dev, mei_header,
                                (unsigned char *)host_cli_req,
                                mei_header->length)) {
                        dev->mei_state = MEI_RESETING;
                        dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n");
                        mei_reset(dev, 1);
                        return;
                }

                dev->init_clients_timer = INIT_CLIENTS_TIMEOUT;
                dev->me_client_index = b;
                return;
        }


        /*
         * Clear Map for indicating now ME clients
         * with associated host client
         */
        bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
        dev->write_hang = -1;
        dev->open_handle_count = 0;
        bitmap_set(dev->host_clients_map, 0, 3);
        dev->mei_state = MEI_ENABLED;

        mei_wd_host_init(dev);
        return;
}

/**
 * mei_init_file_private - initializes private file structure.
 *
 * @priv: private file structure to be initialized
 * @file: the file structure
 */
void mei_init_file_private(struct mei_cl *priv, struct mei_device *dev)
{
        memset(priv, 0, sizeof(struct mei_cl));
        init_waitqueue_head(&priv->wait);
        init_waitqueue_head(&priv->rx_wait);
        init_waitqueue_head(&priv->tx_wait);
        INIT_LIST_HEAD(&priv->link);
        priv->reading_state = MEI_IDLE;
        priv->writing_state = MEI_IDLE;
        priv->dev = dev;
}

int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid)
{
        int i, res = -1;

        for (i = 0; i < dev->num_mei_me_clients; ++i)
                if (uuid_le_cmp(cuuid,
                                dev->me_clients[i].props.protocol_name) == 0) {
                        res = i;
                        break;
                }

        return res;
}


/**
 * mei_find_me_client_update_filext - searches for ME client guid
 *                       sets client_id in mei_file_private if found
 * @dev: the device structure
 * @priv: private file structure to set client_id in
 * @cguid: searched guid of ME client
 * @client_id: id of host client to be set in file private structure
 *
 * returns ME client index
 */
u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv,
                                const uuid_le *cguid, u8 client_id)
{
        int i;

        if (!dev || !priv || !cguid)
                return 0;

        /* check for valid client id */
        i = mei_find_me_client_index(dev, *cguid);
        if (i >= 0) {
                priv->me_client_id = dev->me_clients[i].client_id;
                priv->state = MEI_FILE_CONNECTING;
                priv->host_client_id = client_id;

                list_add_tail(&priv->link, &dev->file_list);
                return (u8)i;
        }

        return 0;
}

/**
 * host_init_iamthif - mei initialization iamthif client.
 *
 * @dev: the device structure
 *
 */
void host_init_iamthif(struct mei_device *dev)
{
        u8 i;
        unsigned char *msg_buf;

        mei_init_file_private(&dev->iamthif_cl, dev);
        dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;

        /* find ME amthi client */
        i = mei_find_me_client_update_filext(dev, &dev->iamthif_cl,
                            &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
        if (dev->iamthif_cl.state != MEI_FILE_CONNECTING) {
                dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
                return;
        }

        /* Do not render the system unusable when iamthif_mtu is not equal to
        the value received from ME.
        Assign iamthif_mtu to the value received from ME in order to solve the
        hardware macro incompatibility. */

        dev_dbg(&dev->pdev->dev, "[DEFAULT] IAMTHIF = %d\n", dev->iamthif_mtu);
        dev->iamthif_mtu = dev->me_clients[i].props.max_msg_length;
        dev_dbg(&dev->pdev->dev,
                        "IAMTHIF = %d\n",
                        dev->me_clients[i].props.max_msg_length);

        kfree(dev->iamthif_msg_buf);
        dev->iamthif_msg_buf = NULL;

        /* allocate storage for ME message buffer */
        msg_buf = kcalloc(dev->iamthif_mtu,
                        sizeof(unsigned char), GFP_KERNEL);
        if (!msg_buf) {
                dev_dbg(&dev->pdev->dev, "memory allocation for ME message buffer failed.\n");
                return;
        }

        dev->iamthif_msg_buf = msg_buf;

        if (!mei_connect(dev, &dev->iamthif_cl)) {
                dev_dbg(&dev->pdev->dev, "Failed to connect to AMTHI client\n");
                dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
                dev->iamthif_cl.host_client_id = 0;
        } else {
                dev->iamthif_cl.timer_count = CONNECT_TIMEOUT;
        }
}

/**
 * mei_alloc_file_private - allocates a private file structure and sets it up.
 * @file: the file structure
 *
 * returns  The allocated file or NULL on failure
 */
struct mei_cl *mei_alloc_file_private(struct mei_device *dev)
{
        struct mei_cl *priv;

        priv = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
        if (!priv)
                return NULL;

        mei_init_file_private(priv, dev);

        return priv;
}



/**
 * mei_disconnect_host_client - sends disconnect message to fw from host client.
 *
 * @dev: the device structure
 * @cl: private data of the file object
 *
 * Locking: called under "dev->device_lock" lock
 *
 * returns 0 on success, <0 on failure.
 */
int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl)
{
        int rets, err;
        long timeout = 15;      /* 15 seconds */
        struct mei_cl_cb *cb;

        if (!dev || !cl)
                return -ENODEV;

        if (cl->state != MEI_FILE_DISCONNECTING)
                return 0;

        cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
        if (!cb)
                return -ENOMEM;

        INIT_LIST_HEAD(&cb->cb_list);
        cb->file_private = cl;
        cb->major_file_operations = MEI_CLOSE;
        if (dev->mei_host_buffer_is_empty) {
                dev->mei_host_buffer_is_empty = 0;
                if (mei_disconnect(dev, cl)) {
                        mdelay(10); /* Wait for hardware disconnection ready */
                        list_add_tail(&cb->cb_list,
                                &dev->ctrl_rd_list.mei_cb.cb_list);
                } else {
                        rets = -ENODEV;
                        dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n");
                        goto free;
                }
        } else {
                dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
                list_add_tail(&cb->cb_list,
                                &dev->ctrl_wr_list.mei_cb.cb_list);
        }
        mutex_unlock(&dev->device_lock);

        err = wait_event_timeout(dev->wait_recvd_msg,
                 (MEI_FILE_DISCONNECTED == cl->state),
                 timeout * HZ);

        mutex_lock(&dev->device_lock);
        if (MEI_FILE_DISCONNECTED == cl->state) {
                rets = 0;
                dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
        } else {
                rets = -ENODEV;
                if (MEI_FILE_DISCONNECTED != cl->state)
                        dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");

                if (err)
                        dev_dbg(&dev->pdev->dev,
                                        "wait failed disconnect err=%08x\n",
                                        err);

                dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
        }

        mei_flush_list(&dev->ctrl_rd_list, cl);
        mei_flush_list(&dev->ctrl_wr_list, cl);
free:
        mei_free_cb_private(cb);
        return rets;
}

/**
 * mei_remove_client_from_file_list -
 *      removes file private data from device file list
 *
 * @dev: the device structure
 * @host_client_id: host client id to be removed
 */
void mei_remove_client_from_file_list(struct mei_device *dev,
                                       u8 host_client_id)
{
        struct mei_cl *cl_pos = NULL;
        struct mei_cl *cl_next = NULL;
        list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
                if (host_client_id == cl_pos->host_client_id) {
                        dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
                                        cl_pos->host_client_id,
                                        cl_pos->me_client_id);
                        list_del_init(&cl_pos->link);
                        break;
                }
        }
}