aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/staging/vt6656/dpc.c
blob: e6367ed3b0bb8e5404cf72dda62281834cd3c013 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
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;
}

Privacy Policy