LXR linux/drivers/staging/vt6655/dpc.c

   1/*
   2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3 * All rights reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License along
  16 * with this program; if not, write to the Free Software Foundation, Inc.,
  17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 *
  19 * File: dpc.c
  20 *
  21 * Purpose: handle dpc rx functions
  22 *
  23 * Author: Lyndon Chen
  24 *
  25 * Date: May 20, 2003
  26 *
  27 * Functions:
  28 *
  29 * Revision History:
  30 *
  31 */
  32
  33#include "device.h"
  34#include "baseband.h"
  35#include "rf.h"
  36#include "dpc.h"
  37
  38static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb,
  39                        u16 bytes_received)
  40{
  41        struct ieee80211_hw *hw = priv->hw;
  42        struct ieee80211_supported_band *sband;
  43        struct ieee80211_rx_status rx_status = { 0 };
  44        struct ieee80211_hdr *hdr;
  45        __le16 fc;
  46        u8 *rsr, *new_rsr, *rssi;
  47        __le64 *tsf_time;
  48        u16 frame_size;
  49        int ii, r;
  50        u8 *rx_sts, *rx_rate, *sq;
  51        u8 *skb_data;
  52        u8 rate_idx = 0;
  53        u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
  54        long rx_dbm;
  55
  56        /* [31:16]RcvByteCount ( not include 4-byte Status ) */
  57        frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2)));
  58        if (frame_size > 2346 || frame_size < 14) {
  59                dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n");
  60                return false;
  61        }
  62
  63        skb_data = (u8 *)skb->data;
  64
  65        rx_sts = skb_data;
  66        rx_rate = skb_data + 1;
  67
  68        sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
  69
  70        for (r = RATE_1M; r < MAX_RATE; r++) {
  71                if (*rx_rate == rate[r])
  72                        break;
  73        }
  74
  75        priv->rx_rate = r;
  76
  77        for (ii = 0; ii < sband->n_bitrates; ii++) {
  78                if (sband->bitrates[ii].hw_value == r) {
  79                        rate_idx = ii;
  80                                break;
  81                }
  82        }
  83
  84        if (ii == sband->n_bitrates) {
  85                dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate);
  86                return false;
  87        }
  88
  89        tsf_time = (__le64 *)(skb_data + bytes_received - 12);
  90        sq = skb_data + bytes_received - 4;
  91        new_rsr = skb_data + bytes_received - 3;
  92        rssi = skb_data + bytes_received - 2;
  93        rsr = skb_data + bytes_received - 1;
  94        if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
  95                return false;
  96
  97        RFvRSSITodBm(priv, *rssi, &rx_dbm);
  98
  99        priv->byBBPreEDRSSI = (u8)rx_dbm + 1;
 100        priv->uCurrRSSI = *rssi;
 101
 102        skb_pull(skb, 4);
 103        skb_trim(skb, frame_size);
 104
 105        rx_status.mactime = le64_to_cpu(*tsf_time);
 106        rx_status.band = hw->conf.chandef.chan->band;
 107        rx_status.signal = rx_dbm;
 108        rx_status.flag = 0;
 109        rx_status.freq = hw->conf.chandef.chan->center_freq;
 110
 111        if (!(*rsr & RSR_CRCOK))
 112                rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 113
 114        hdr = (struct ieee80211_hdr *)(skb->data);
 115        fc = hdr->frame_control;
 116
 117        rx_status.rate_idx = rate_idx;
 118
 119        if (ieee80211_has_protected(fc)) {
 120                if (priv->byLocalID > REV_ID_VT3253_A1)
 121                        rx_status.flag |= RX_FLAG_DECRYPTED;
 122
 123                /* Drop packet */
 124                if (!(*new_rsr & NEWRSR_DECRYPTOK))
 125                        return false;
 126        }
 127
 128        memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 129
 130        ieee80211_rx_irqsafe(priv->hw, skb);
 131
 132        return true;
 133}
 134
 135bool vnt_receive_frame(struct vnt_private *priv, struct vnt_rx_desc *curr_rd)
 136{
 137        struct vnt_rd_info *rd_info = curr_rd->rd_info;
 138        struct sk_buff *skb;
 139        u16 frame_size;
 140
 141        skb = rd_info->skb;
 142
 143        dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
 144                         priv->rx_buf_sz, DMA_FROM_DEVICE);
 145
 146        frame_size = le16_to_cpu(curr_rd->rd1.req_count)
 147                        - le16_to_cpu(curr_rd->rd0.res_count);
 148
 149        if ((frame_size > 2364) || (frame_size < 33)) {
 150                /* Frame Size error drop this packet.*/
 151                dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size);
 152                dev_kfree_skb_irq(skb);
 153                return true;
 154        }
 155
 156        if (vnt_rx_data(priv, skb, frame_size))
 157                return true;
 158
 159        dev_kfree_skb_irq(skb);
 160
 161        return true;
 162}
 163