From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/staging/vt6655/dpc.c | 162 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 162 insertions(+) create mode 100644 drivers/staging/vt6655/dpc.c (limited to 'drivers/staging/vt6655/dpc.c') diff --git a/drivers/staging/vt6655/dpc.c b/drivers/staging/vt6655/dpc.c new file mode 100644 index 000000000..b25ee9625 --- /dev/null +++ b/drivers/staging/vt6655/dpc.c @@ -0,0 +1,162 @@ +/* + * 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 "device.h" +#include "baseband.h" +#include "rf.h" +#include "dpc.h" + +static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb, + u16 bytes_received) +{ + struct ieee80211_hw *hw = priv->hw; + struct ieee80211_supported_band *sband; + struct ieee80211_rx_status rx_status = { 0 }; + struct ieee80211_hdr *hdr; + __le16 fc; + u8 *rsr, *new_rsr, *rssi; + __le64 *tsf_time; + u16 frame_size; + int ii, r; + u8 *rx_sts, *rx_rate, *sq; + u8 *skb_data; + u8 rate_idx = 0; + u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108}; + long rx_dbm; + + /* [31:16]RcvByteCount ( not include 4-byte Status ) */ + frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2))); + if (frame_size > 2346 || frame_size < 14) { + dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n"); + return false; + } + + skb_data = (u8 *)skb->data; + + rx_sts = skb_data; + rx_rate = skb_data + 1; + + 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->pcid->dev, "Wrong RxRate %x\n", *rx_rate); + return false; + } + + tsf_time = (__le64 *)(skb_data + bytes_received - 12); + sq = skb_data + bytes_received - 4; + new_rsr = skb_data + bytes_received - 3; + rssi = skb_data + bytes_received - 2; + rsr = skb_data + bytes_received - 1; + if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN)) + return false; + + RFvRSSITodBm(priv, *rssi, &rx_dbm); + + priv->byBBPreEDRSSI = (u8)rx_dbm + 1; + priv->uCurrRSSI = *rssi; + + skb_pull(skb, 4); + skb_trim(skb, frame_size); + + rx_status.mactime = le64_to_cpu(*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->byLocalID > REV_ID_VT3253_A1) + rx_status.flag |= RX_FLAG_DECRYPTED; + + /* Drop packet */ + if (!(*new_rsr & NEWRSR_DECRYPTOK)) + return false; + } + + memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status)); + + ieee80211_rx_irqsafe(priv->hw, skb); + + return true; +} + +bool vnt_receive_frame(struct vnt_private *priv, PSRxDesc curr_rd) +{ + PDEVICE_RD_INFO rd_info = curr_rd->pRDInfo; + struct sk_buff *skb; + u16 frame_size; + + skb = rd_info->skb; + + dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma, + priv->rx_buf_sz, DMA_FROM_DEVICE); + + frame_size = le16_to_cpu(curr_rd->m_rd1RD1.wReqCount) + - cpu_to_le16(curr_rd->m_rd0RD0.wResCount); + + if ((frame_size > 2364) || (frame_size < 33)) { + /* Frame Size error drop this packet.*/ + dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size); + dev_kfree_skb_irq(skb); + return true; + } + + if (vnt_rx_data(priv, skb, frame_size)) + return true; + + dev_kfree_skb_irq(skb); + + return true; +} -- cgit v1.2.3-54-g00ecf