/*
 * Copyright (c) 2012-2014 The Linux Foundation. All rights reserved.
 *
 * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
 *
 *
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all
 * copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * This file was originally distributed by Qualcomm Atheros, Inc.
 * under proprietary terms before Copyright ownership was assigned
 * to the Linux Foundation.
 */

#include "ol_txrx_types.h"

#ifdef WDI_EVENT_ENABLE

static inline wdi_event_subscribe *
wdi_event_next_sub(wdi_event_subscribe *wdi_sub)
{
    if (!wdi_sub) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid subscriber in %s\n", __FUNCTION__);
        return NULL;
    }
    return wdi_sub->priv.next;
}

static inline void
wdi_event_del_subs(wdi_event_subscribe *wdi_sub, int event_index)
{
    wdi_event_notify deallocate_sub;
    while (wdi_sub) {
        wdi_event_subscribe *next = wdi_event_next_sub(wdi_sub);
            /*
             *  Context is NULL for static allocation of subs
             *  In dynamic allocation case notify the user
             */
        if (wdi_sub->context) {
            deallocate_sub = wdi_sub->context;
            deallocate_sub(
                WDI_EVENT_SUB_DEALLOCATE, WDI_EVENT_BASE + event_index);
        }
        wdi_sub = next;
    }
    //adf_os_mem_free(wdi_sub);
}

static inline void
wdi_event_iter_sub(
    struct ol_txrx_pdev_t *pdev,
    uint32_t event_index,
    wdi_event_subscribe *wdi_sub,
    void *data)
{
    enum WDI_EVENT event = event_index + WDI_EVENT_BASE;

    if (wdi_sub) {
        do {
            wdi_sub->callback(pdev, event, data);
        } while ((wdi_sub = wdi_event_next_sub(wdi_sub)));
    }
}

void
wdi_event_handler(
    enum WDI_EVENT event,
    struct ol_txrx_pdev_t *txrx_pdev,
    void *data)
{
    uint32_t event_index;
    wdi_event_subscribe *wdi_sub;
    /*
     * Input validation
     */
    if (event == 0) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid WDI event in %s\n", __FUNCTION__);
        return;
    }
    if (!txrx_pdev) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid pdev in WDI event handler\n");
        return;
    }
    /*
     *  There can be NULL data, so no validation for the data
     *  Subscribers must do the sanity based on the requirements
     */
    event_index = event - WDI_EVENT_BASE;

    wdi_sub = txrx_pdev->wdi_event_list[event_index];

    /* Find the subscriber */
    wdi_event_iter_sub(txrx_pdev, event_index, wdi_sub, data);
}

A_STATUS
wdi_event_sub(
    struct ol_txrx_pdev_t *txrx_pdev,
    wdi_event_subscribe *event_cb_sub,
    enum WDI_EVENT event)
{
    uint32_t event_index;
    wdi_event_subscribe *wdi_sub;
    /* Input validation */
    if (!txrx_pdev) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid txrx_pdev in %s", __FUNCTION__);
        return A_ERROR;
    }
    if (!event_cb_sub) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid callback in %s", __FUNCTION__);
        return A_ERROR;
    }
    if ((event == 0) || (event >= WDI_EVENT_LAST) || (event < WDI_EVENT_BASE)) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid event in %s", __FUNCTION__);
        return A_ERROR;
    } /* Input validation */

    event_index = event - WDI_EVENT_BASE;

    wdi_sub = txrx_pdev->wdi_event_list[event_index];
    /*
     *  Check if it is the first subscriber of the event
     */
    if (!wdi_sub) {
        wdi_sub = event_cb_sub;
        wdi_sub->priv.next = NULL;
        wdi_sub->priv.prev = NULL;
        txrx_pdev->wdi_event_list[event_index] = wdi_sub;
        return A_OK;
    }
    event_cb_sub->priv.next = wdi_sub;
    event_cb_sub->priv.prev = NULL;
    wdi_sub->priv.prev = event_cb_sub;
    txrx_pdev->wdi_event_list[event_index] = event_cb_sub;

    return A_OK;
}

A_STATUS
wdi_event_unsub(
    struct ol_txrx_pdev_t *txrx_pdev,
    wdi_event_subscribe *event_cb_sub,
    enum WDI_EVENT event)
{
    uint32_t event_index = event - WDI_EVENT_BASE;

    /* Input validation */
    if (!event_cb_sub) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid callback in %s", __FUNCTION__);
        return A_ERROR;
    }
    if (!event_cb_sub->priv.prev) {
        txrx_pdev->wdi_event_list[event_index] = event_cb_sub->priv.next;
    } else {
        event_cb_sub->priv.prev->priv.next = event_cb_sub->priv.next;
    }
    if (event_cb_sub->priv.next) {
        event_cb_sub->priv.next->priv.prev = event_cb_sub->priv.prev;
    }
    //adf_os_mem_free(event_cb_sub);

    return A_OK;
}

A_STATUS
wdi_event_attach(struct ol_txrx_pdev_t *txrx_pdev)
{
    /* Input validation */
    if (!txrx_pdev) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid device in %s\nWDI event attach failed", __FUNCTION__);
        return A_ERROR;
    }
    /* Separate subscriber list for each event */
    txrx_pdev->wdi_event_list = (wdi_event_subscribe **)
        adf_os_mem_alloc(
            txrx_pdev->osdev, sizeof(wdi_event_subscribe *) * WDI_NUM_EVENTS);
    if (!txrx_pdev->wdi_event_list) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Insufficient memory for the WDI event lists\n");
        return A_NO_MEMORY;
    }
    return A_OK;
}

A_STATUS
wdi_event_detach(struct ol_txrx_pdev_t *txrx_pdev)
{
    int i;
    wdi_event_subscribe *wdi_sub;
    if (!txrx_pdev) {
        VOS_TRACE(VOS_MODULE_ID_TXRX, VOS_TRACE_LEVEL_ERROR,
            "Invalid device in %s\nWDI attach failed", __FUNCTION__);
        return A_ERROR;
    }
    if (!txrx_pdev->wdi_event_list) {
        return A_ERROR;
    }
    for (i = 0; i < WDI_NUM_EVENTS; i++) {
        wdi_sub = txrx_pdev->wdi_event_list[i];
        if (wdi_sub) {
            /* Delete all the subscribers */
            wdi_event_del_subs(wdi_sub, i);
        }
    }
    /* txrx_pdev->wdi_event_list would be non-null */
    adf_os_mem_free(txrx_pdev->wdi_event_list);
    return A_OK;
}

#endif /* WDI_EVENT_ENABLE */