1 /* ZD1211 USB-WLAN driver for Linux
2 *
3 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
4 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #ifndef _ZD_MAC_H
22 #define _ZD_MAC_H
23
24 #include <linux/kernel.h>
25 #include <net/mac80211.h>
26
27 #include "zd_chip.h"
28 #include "zd_ieee80211.h"
29
30 struct zd_ctrlset {
31 u8 modulation;
32 __le16 tx_length;
33 u8 control;
34 /* stores only the difference to tx_length on ZD1211B */
35 __le16 packet_length;
36 __le16 current_length;
37 u8 service;
38 __le16 next_frame_length;
39 } __attribute__((packed));
40
41 #define ZD_CS_RESERVED_SIZE 25
42
43 /* The field modulation of struct zd_ctrlset controls the bit rate, the use
44 * of short or long preambles in 802.11b (CCK mode) or the use of 802.11a or
45 * 802.11g in OFDM mode.
46 *
47 * The term zd-rate is used for the combination of the modulation type flag
48 * and the "pure" rate value.
49 */
50 #define ZD_PURE_RATE_MASK 0x0f
51 #define ZD_MODULATION_TYPE_MASK 0x10
52 #define ZD_RATE_MASK (ZD_PURE_RATE_MASK|ZD_MODULATION_TYPE_MASK)
53 #define ZD_PURE_RATE(modulation) ((modulation) & ZD_PURE_RATE_MASK)
54 #define ZD_MODULATION_TYPE(modulation) ((modulation) & ZD_MODULATION_TYPE_MASK)
55 #define ZD_RATE(modulation) ((modulation) & ZD_RATE_MASK)
56
57 /* The two possible modulation types. Notify that 802.11b doesn't use the CCK
58 * codeing for the 1 and 2 MBit/s rate. We stay with the term here to remain
59 * consistent with uses the term at other places.
60 */
61 #define ZD_CCK 0x00
62 #define ZD_OFDM 0x10
63
64 /* The ZD1211 firmware uses proprietary encodings of the 802.11b (CCK) rates.
65 * For OFDM the PLCP rate encodings are used. We combine these "pure" rates
66 * with the modulation type flag and call the resulting values zd-rates.
67 */
68 #define ZD_CCK_RATE_1M (ZD_CCK|0x00)
69 #define ZD_CCK_RATE_2M (ZD_CCK|0x01)
70 #define ZD_CCK_RATE_5_5M (ZD_CCK|0x02)
71 #define ZD_CCK_RATE_11M (ZD_CCK|0x03)
72 #define ZD_OFDM_RATE_6M (ZD_OFDM|ZD_OFDM_PLCP_RATE_6M)
73 #define ZD_OFDM_RATE_9M (ZD_OFDM|ZD_OFDM_PLCP_RATE_9M)
74 #define ZD_OFDM_RATE_12M (ZD_OFDM|ZD_OFDM_PLCP_RATE_12M)
75 #define ZD_OFDM_RATE_18M (ZD_OFDM|ZD_OFDM_PLCP_RATE_18M)
76 #define ZD_OFDM_RATE_24M (ZD_OFDM|ZD_OFDM_PLCP_RATE_24M)
77 #define ZD_OFDM_RATE_36M (ZD_OFDM|ZD_OFDM_PLCP_RATE_36M)
78 #define ZD_OFDM_RATE_48M (ZD_OFDM|ZD_OFDM_PLCP_RATE_48M)
79 #define ZD_OFDM_RATE_54M (ZD_OFDM|ZD_OFDM_PLCP_RATE_54M)
80
81 /* The bit 5 of the zd_ctrlset modulation field controls the preamble in CCK
82 * mode or the 802.11a/802.11g selection in OFDM mode.
83 */
84 #define ZD_CCK_PREA_LONG 0x00
85 #define ZD_CCK_PREA_SHORT 0x20
86 #define ZD_OFDM_MODE_11G 0x00
87 #define ZD_OFDM_MODE_11A 0x20
88
89 /* zd_ctrlset control field */
90 #define ZD_CS_NEED_RANDOM_BACKOFF 0x01
91 #define ZD_CS_MULTICAST 0x02
92
93 #define ZD_CS_FRAME_TYPE_MASK 0x0c
94 #define ZD_CS_DATA_FRAME 0x00
95 #define ZD_CS_PS_POLL_FRAME 0x04
96 #define ZD_CS_MANAGEMENT_FRAME 0x08
97 #define ZD_CS_NO_SEQUENCE_CTL_FRAME 0x0c
98
99 #define ZD_CS_WAKE_DESTINATION 0x10
100 #define ZD_CS_RTS 0x20
101 #define ZD_CS_ENCRYPT 0x40
102 #define ZD_CS_SELF_CTS 0x80
103
104 /* Incoming frames are prepended by a PLCP header */
105 #define ZD_PLCP_HEADER_SIZE 5
106
107 struct rx_length_info {
108 __le16 length[3];
109 __le16 tag;
110 } __attribute__((packed));
111
112 #define RX_LENGTH_INFO_TAG 0x697e
113
114 struct rx_status {
115 u8 signal_quality_cck;
116 /* rssi */
117 u8 signal_strength;
118 u8 signal_quality_ofdm;
119 u8 decryption_type;
120 u8 frame_status;
121 } __attribute__((packed));
122
123 /* rx_status field decryption_type */
124 #define ZD_RX_NO_WEP 0
125 #define ZD_RX_WEP64 1
126 #define ZD_RX_TKIP 2
127 #define ZD_RX_AES 4
128 #define ZD_RX_WEP128 5
129 #define ZD_RX_WEP256 6
130
131 /* rx_status field frame_status */
132 #define ZD_RX_FRAME_MODULATION_MASK 0x01
133 #define ZD_RX_CCK 0x00
134 #define ZD_RX_OFDM 0x01
135
136 #define ZD_RX_TIMEOUT_ERROR 0x02
137 #define ZD_RX_FIFO_OVERRUN_ERROR 0x04
138 #define ZD_RX_DECRYPTION_ERROR 0x08
139 #define ZD_RX_CRC32_ERROR 0x10
140 #define ZD_RX_NO_ADDR1_MATCH_ERROR 0x20
141 #define ZD_RX_CRC16_ERROR 0x40
142 #define ZD_RX_ERROR 0x80
143
144 enum mac_flags {
145 MAC_FIXED_CHANNEL = 0x01,
146 };
147
148 struct housekeeping {
149 struct delayed_work link_led_work;
150 };
151
152 /**
153 * struct zd_tx_skb_control_block - control block for tx skbuffs
154 * @control: &struct ieee80211_tx_control pointer
155 * @context: context pointer
156 *
157 * This structure is used to fill the cb field in an &sk_buff to transmit.
158 * The control field is NULL, if there is no requirement from the mac80211
159 * stack to report about the packet ACK. This is the case if the flag
160 * IEEE80211_TXCTL_NO_ACK is not set in &struct ieee80211_tx_control.
161 */
162 struct zd_tx_skb_control_block {
163 struct ieee80211_tx_control *control;
164 struct ieee80211_hw *hw;
165 void *context;
166 };
167
168 #define ZD_MAC_STATS_BUFFER_SIZE 16
169
170 #define ZD_MAC_MAX_ACK_WAITERS 10
171
172 struct zd_mac {
173 struct zd_chip chip;
174 spinlock_t lock;
175 struct ieee80211_hw *hw;
176 struct housekeeping housekeeping;
177 struct work_struct set_multicast_hash_work;
178 struct work_struct set_rts_cts_work;
179 struct work_struct set_rx_filter_work;
180 struct zd_mc_hash multicast_hash;
181 u8 regdomain;
182 u8 default_regdomain;
183 int type;
184 int associated;
185 struct sk_buff_head ack_wait_queue;
186 struct ieee80211_channel channels[14];
187 struct ieee80211_rate rates[12];
188 struct ieee80211_hw_mode modes[2];
189
190 /* Short preamble (used for RTS/CTS) */
191 unsigned int short_preamble:1;
192
193 /* flags to indicate update in progress */
194 unsigned int updating_rts_rate:1;
195
196 /* whether to pass frames with CRC errors to stack */
197 unsigned int pass_failed_fcs:1;
198
199 /* whether to pass control frames to stack */
200 unsigned int pass_ctrl:1;
201 };
202
203 static inline struct zd_mac *zd_hw_mac(struct ieee80211_hw *hw)
204 {
205 return hw->priv;
206 }
207
208 static inline struct zd_mac *zd_chip_to_mac(struct zd_chip *chip)
209 {
210 return container_of(chip, struct zd_mac, chip);
211 }
212
213 static inline struct zd_mac *zd_usb_to_mac(struct zd_usb *usb)
214 {
215 return zd_chip_to_mac(zd_usb_to_chip(usb));
216 }
217
218 static inline u8 *zd_mac_get_perm_addr(struct zd_mac *mac)
219 {
220 return mac->hw->wiphy->perm_addr;
221 }
222
223 #define zd_mac_dev(mac) (zd_chip_dev(&(mac)->chip))
224
225 struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf);
226 void zd_mac_clear(struct zd_mac *mac);
227
228 int zd_mac_preinit_hw(struct ieee80211_hw *hw);
229 int zd_mac_init_hw(struct ieee80211_hw *hw);
230
231 int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length);
232 void zd_mac_tx_failed(struct ieee80211_hw *hw);
233 void zd_mac_tx_to_dev(struct sk_buff *skb, int error);
234
235 #ifdef DEBUG
236 void zd_dump_rx_status(const struct rx_status *status);
237 #else
238 #define zd_dump_rx_status(status)
239 #endif /* DEBUG */
240
241 #endif /* _ZD_MAC_H */
242
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