/*
 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * File: dpc.c
 *
 * Purpose: handle dpc rx functions
 *
 * Author: Lyndon Chen
 *
 * Date: May 20, 2003
 *
 * Functions:
 *
 * Revision History:
 *
 */

#include "dpc.h"
#include "device.h"
#include "mac.h"
#include "baseband.h"
#include "rf.h"

int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
        unsigned long bytes_received)
{
        struct ieee80211_hw *hw = priv->hw;
        struct ieee80211_supported_band *sband;
        struct sk_buff *skb;
        struct ieee80211_rx_status rx_status = { 0 };
        struct ieee80211_hdr *hdr;
        __le16 fc;
        u8 *rsr, *new_rsr, *rssi, *frame;
        __le64 *tsf_time;
        u32 frame_size;
        int ii, r;
        u8 *rx_sts, *rx_rate, *sq, *sq_3;
        u32 wbk_status;
        u8 *skb_data;
        u16 *pay_load_len;
        u16 pay_load_with_padding;
        u8 rate_idx = 0;
        u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
        long rx_dbm;

        skb = ptr_rcb->skb;

        /* [31:16]RcvByteCount ( not include 4-byte Status ) */
        wbk_status = *((u32 *)(skb->data));
        frame_size = wbk_status >> 16;
        frame_size += 4;

        if (bytes_received != frame_size) {
                dev_dbg(&priv->usb->dev, "------- WRONG Length 1\n");
                return false;
        }

        if ((bytes_received > 2372) || (bytes_received <= 40)) {
                /* Frame Size error drop this packet.*/
                dev_dbg(&priv->usb->dev, "------ WRONG Length 2\n");
                return false;
        }

        skb_data = (u8 *)skb->data;

        rx_sts = skb_data+4;
        rx_rate = skb_data+5;

        /* real Frame Size = USBframe_size -4WbkStatus - 4RxStatus */
        /* -8TSF - 4RSR - 4SQ3 - ?Padding */

        /* if SQ3 the range is 24~27, if no SQ3 the range is 20~23 */

        pay_load_len = (u16 *) (skb_data + 6);

        /*Fix hardware bug => PLCP_Length error */
        if (((bytes_received - (*pay_load_len)) > 27) ||
                ((bytes_received - (*pay_load_len)) < 24) ||
                        (bytes_received < (*pay_load_len))) {
                dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n",
                                                        *pay_load_len);
                return false;
        }

        sband = hw->wiphy->bands[hw->conf.chandef.chan->band];

        for (r = RATE_1M; r < MAX_RATE; r++) {
                if (*rx_rate == rate[r])
                        break;
        }

        priv->rx_rate = r;

        for (ii = 0; ii < sband->n_bitrates; ii++) {
                if (sband->bitrates[ii].hw_value == r) {
                        rate_idx = ii;
                                break;
                }
        }

        if (ii == sband->n_bitrates) {
                dev_dbg(&priv->usb->dev, "Wrong RxRate %x\n", *rx_rate);
                return false;
        }

        pay_load_with_padding = ((*pay_load_len / 4) +
                ((*pay_load_len % 4) ? 1 : 0)) * 4;

        tsf_time = (__le64 *)(skb_data + 8 + pay_load_with_padding);

        priv->tsf_time = le64_to_cpu(*tsf_time);

        if (priv->bb_type == BB_TYPE_11G) {
                sq_3 = skb_data + 8 + pay_load_with_padding + 12;
                sq = sq_3;
        } else {
                sq = skb_data + 8 + pay_load_with_padding + 8;
                sq_3 = sq;
        }

        new_rsr = skb_data + 8 + pay_load_with_padding + 9;
        rssi = skb_data + 8 + pay_load_with_padding + 10;

        rsr = skb_data + 8 + pay_load_with_padding + 11;
        if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
                return false;

        frame_size = *pay_load_len;

        vnt_rf_rssi_to_dbm(priv, *rssi, &rx_dbm);

        priv->bb_pre_ed_rssi = (u8)rx_dbm + 1;
        priv->current_rssi = priv->bb_pre_ed_rssi;

        frame = skb_data + 8;

        skb_pull(skb, 8);
        skb_trim(skb, frame_size);

        rx_status.mactime = priv->tsf_time;
        rx_status.band = hw->conf.chandef.chan->band;
        rx_status.signal = rx_dbm;
        rx_status.flag = 0;
        rx_status.freq = hw->conf.chandef.chan->center_freq;

        if (!(*rsr & RSR_CRCOK))
                rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;

        hdr = (struct ieee80211_hdr *)(skb->data);
        fc = hdr->frame_control;

        rx_status.rate_idx = rate_idx;

        if (ieee80211_has_protected(fc)) {
                if (priv->local_id > REV_ID_VT3253_A1) {
                        rx_status.flag |= RX_FLAG_DECRYPTED;

                        /* Drop packet */
                        if (!(*new_rsr & NEWRSR_DECRYPTOK)) {
                                dev_kfree_skb(skb);
                                return true;
                        }
                }
        }

        memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));

        ieee80211_rx_irqsafe(priv->hw, skb);

        return true;
}