diff options
Diffstat (limited to 'drivers/staging/vt6656/dpc.c')
| -rw-r--r-- | drivers/staging/vt6656/dpc.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/staging/vt6656/dpc.c b/drivers/staging/vt6656/dpc.c new file mode 100644 index 000000000..e6367ed3b --- /dev/null +++ b/drivers/staging/vt6656/dpc.c @@ -0,0 +1,186 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * 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; +} |