[PATCH] ZyDAS ZD1211 USB-WLAN driver
[linux-2.6.git] / drivers / net / wireless / zd1211rw / zd_mac.c
1 /* zd_mac.c
2  *
3  * This program is free software; you can redistribute it and/or modify
4  * it under the terms of the GNU General Public License as published by
5  * the Free Software Foundation; either version 2 of the License, or
6  * (at your option) any later version.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16  */
17
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/wireless.h>
21 #include <linux/usb.h>
22 #include <linux/jiffies.h>
23 #include <net/ieee80211_radiotap.h>
24
25 #include "zd_def.h"
26 #include "zd_chip.h"
27 #include "zd_mac.h"
28 #include "zd_ieee80211.h"
29 #include "zd_netdev.h"
30 #include "zd_rf.h"
31 #include "zd_util.h"
32
33 static void ieee_init(struct ieee80211_device *ieee);
34 static void softmac_init(struct ieee80211softmac_device *sm);
35
36 int zd_mac_init(struct zd_mac *mac,
37                 struct net_device *netdev,
38                 struct usb_interface *intf)
39 {
40         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
41
42         memset(mac, 0, sizeof(*mac));
43         spin_lock_init(&mac->lock);
44         mac->netdev = netdev;
45
46         ieee_init(ieee);
47         softmac_init(ieee80211_priv(netdev));
48         zd_chip_init(&mac->chip, netdev, intf);
49         return 0;
50 }
51
52 static int reset_channel(struct zd_mac *mac)
53 {
54         int r;
55         unsigned long flags;
56         const struct channel_range *range;
57
58         spin_lock_irqsave(&mac->lock, flags);
59         range = zd_channel_range(mac->regdomain);
60         if (!range->start) {
61                 r = -EINVAL;
62                 goto out;
63         }
64         mac->requested_channel = range->start;
65         r = 0;
66 out:
67         spin_unlock_irqrestore(&mac->lock, flags);
68         return r;
69 }
70
71 int zd_mac_init_hw(struct zd_mac *mac, u8 device_type)
72 {
73         int r;
74         struct zd_chip *chip = &mac->chip;
75         u8 addr[ETH_ALEN];
76         u8 default_regdomain;
77
78         r = zd_chip_enable_int(chip);
79         if (r)
80                 goto out;
81         r = zd_chip_init_hw(chip, device_type);
82         if (r)
83                 goto disable_int;
84
85         zd_get_e2p_mac_addr(chip, addr);
86         r = zd_write_mac_addr(chip, addr);
87         if (r)
88                 goto disable_int;
89         ZD_ASSERT(!irqs_disabled());
90         spin_lock_irq(&mac->lock);
91         memcpy(mac->netdev->dev_addr, addr, ETH_ALEN);
92         spin_unlock_irq(&mac->lock);
93
94         r = zd_read_regdomain(chip, &default_regdomain);
95         if (r)
96                 goto disable_int;
97         if (!zd_regdomain_supported(default_regdomain)) {
98                 dev_dbg_f(zd_mac_dev(mac),
99                           "Regulatory Domain %#04x is not supported.\n",
100                           default_regdomain);
101                 r = -EINVAL;
102                 goto disable_int;
103         }
104         spin_lock_irq(&mac->lock);
105         mac->regdomain = mac->default_regdomain = default_regdomain;
106         spin_unlock_irq(&mac->lock);
107         r = reset_channel(mac);
108         if (r)
109                 goto disable_int;
110
111         r = zd_set_encryption_type(chip, NO_WEP);
112         if (r)
113                 goto disable_int;
114
115         r = zd_geo_init(zd_mac_to_ieee80211(mac), mac->regdomain);
116         if (r)
117                 goto disable_int;
118
119         r = 0;
120 disable_int:
121         zd_chip_disable_int(chip);
122 out:
123         return r;
124 }
125
126 void zd_mac_clear(struct zd_mac *mac)
127 {
128         /* Aquire the lock. */
129         spin_lock(&mac->lock);
130         spin_unlock(&mac->lock);
131         zd_chip_clear(&mac->chip);
132         memset(mac, 0, sizeof(*mac));
133 }
134
135 static int reset_mode(struct zd_mac *mac)
136 {
137         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
138         struct zd_ioreq32 ioreqs[3] = {
139                 { CR_RX_FILTER, RX_FILTER_BEACON|RX_FILTER_PROBE_RESPONSE|
140                                 RX_FILTER_AUTH|RX_FILTER_ASSOC_RESPONSE },
141                 { CR_SNIFFER_ON, 0U },
142                 { CR_ENCRYPTION_TYPE, NO_WEP },
143         };
144
145         if (ieee->iw_mode == IW_MODE_MONITOR) {
146                 ioreqs[0].value = 0xffffffff;
147                 ioreqs[1].value = 0x1;
148                 ioreqs[2].value = ENC_SNIFFER;
149         }
150
151         return zd_iowrite32a(&mac->chip, ioreqs, 3);
152 }
153
154 int zd_mac_open(struct net_device *netdev)
155 {
156         struct zd_mac *mac = zd_netdev_mac(netdev);
157         struct zd_chip *chip = &mac->chip;
158         int r;
159
160         r = zd_chip_enable_int(chip);
161         if (r < 0)
162                 goto out;
163
164         r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
165         if (r < 0)
166                 goto disable_int;
167         r = reset_mode(mac);
168         if (r)
169                 goto disable_int;
170         r = zd_chip_switch_radio_on(chip);
171         if (r < 0)
172                 goto disable_int;
173         r = zd_chip_set_channel(chip, mac->requested_channel);
174         if (r < 0)
175                 goto disable_radio;
176         r = zd_chip_enable_rx(chip);
177         if (r < 0)
178                 goto disable_radio;
179         r = zd_chip_enable_hwint(chip);
180         if (r < 0)
181                 goto disable_rx;
182
183         ieee80211softmac_start(netdev);
184         return 0;
185 disable_rx:
186         zd_chip_disable_rx(chip);
187 disable_radio:
188         zd_chip_switch_radio_off(chip);
189 disable_int:
190         zd_chip_disable_int(chip);
191 out:
192         return r;
193 }
194
195 int zd_mac_stop(struct net_device *netdev)
196 {
197         struct zd_mac *mac = zd_netdev_mac(netdev);
198         struct zd_chip *chip = &mac->chip;
199
200         /*
201          * The order here deliberately is a little different from the open()
202          * method, since we need to make sure there is no opportunity for RX
203          * frames to be processed by softmac after we have stopped it.
204          */
205
206         zd_chip_disable_rx(chip);
207         ieee80211softmac_stop(netdev);
208
209         zd_chip_disable_hwint(chip);
210         zd_chip_switch_radio_off(chip);
211         zd_chip_disable_int(chip);
212
213         return 0;
214 }
215
216 int zd_mac_set_mac_address(struct net_device *netdev, void *p)
217 {
218         int r;
219         unsigned long flags;
220         struct sockaddr *addr = p;
221         struct zd_mac *mac = zd_netdev_mac(netdev);
222         struct zd_chip *chip = &mac->chip;
223
224         if (!is_valid_ether_addr(addr->sa_data))
225                 return -EADDRNOTAVAIL;
226
227         dev_dbg_f(zd_mac_dev(mac),
228                   "Setting MAC to " MAC_FMT "\n", MAC_ARG(addr->sa_data));
229
230         r = zd_write_mac_addr(chip, addr->sa_data);
231         if (r)
232                 return r;
233
234         spin_lock_irqsave(&mac->lock, flags);
235         memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
236         spin_unlock_irqrestore(&mac->lock, flags);
237
238         return 0;
239 }
240
241 int zd_mac_set_regdomain(struct zd_mac *mac, u8 regdomain)
242 {
243         int r;
244         u8 channel;
245
246         ZD_ASSERT(!irqs_disabled());
247         spin_lock_irq(&mac->lock);
248         if (regdomain == 0) {
249                 regdomain = mac->default_regdomain;
250         }
251         if (!zd_regdomain_supported(regdomain)) {
252                 spin_unlock_irq(&mac->lock);
253                 return -EINVAL;
254         }
255         mac->regdomain = regdomain;
256         channel = mac->requested_channel;
257         spin_unlock_irq(&mac->lock);
258
259         r = zd_geo_init(zd_mac_to_ieee80211(mac), regdomain);
260         if (r)
261                 return r;
262         if (!zd_regdomain_supports_channel(regdomain, channel)) {
263                 r = reset_channel(mac);
264                 if (r)
265                         return r;
266         }
267
268         return 0;
269 }
270
271 u8 zd_mac_get_regdomain(struct zd_mac *mac)
272 {
273         unsigned long flags;
274         u8 regdomain;
275
276         spin_lock_irqsave(&mac->lock, flags);
277         regdomain = mac->regdomain;
278         spin_unlock_irqrestore(&mac->lock, flags);
279         return regdomain;
280 }
281
282 static void set_channel(struct net_device *netdev, u8 channel)
283 {
284         struct zd_mac *mac = zd_netdev_mac(netdev);
285
286         dev_dbg_f(zd_mac_dev(mac), "channel %d\n", channel);
287
288         zd_chip_set_channel(&mac->chip, channel);
289 }
290
291 /* TODO: Should not work in Managed mode. */
292 int zd_mac_request_channel(struct zd_mac *mac, u8 channel)
293 {
294         unsigned long lock_flags;
295         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
296
297         if (ieee->iw_mode == IW_MODE_INFRA)
298                 return -EPERM;
299
300         spin_lock_irqsave(&mac->lock, lock_flags);
301         if (!zd_regdomain_supports_channel(mac->regdomain, channel)) {
302                 spin_unlock_irqrestore(&mac->lock, lock_flags);
303                 return -EINVAL;
304         }
305         mac->requested_channel = channel;
306         spin_unlock_irqrestore(&mac->lock, lock_flags);
307         if (netif_running(mac->netdev))
308                 return zd_chip_set_channel(&mac->chip, channel);
309         else
310                 return 0;
311 }
312
313 int zd_mac_get_channel(struct zd_mac *mac, u8 *channel, u8 *flags)
314 {
315         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
316
317         *channel = zd_chip_get_channel(&mac->chip);
318         if (ieee->iw_mode != IW_MODE_INFRA) {
319                 spin_lock_irq(&mac->lock);
320                 *flags = *channel == mac->requested_channel ?
321                         MAC_FIXED_CHANNEL : 0;
322                 spin_unlock(&mac->lock);
323         } else {
324                 *flags = 0;
325         }
326         dev_dbg_f(zd_mac_dev(mac), "channel %u flags %u\n", *channel, *flags);
327         return 0;
328 }
329
330 /* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */
331 static u8 cs_typed_rate(u8 cs_rate)
332 {
333         static const u8 typed_rates[16] = {
334                 [ZD_CS_CCK_RATE_1M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_1M,
335                 [ZD_CS_CCK_RATE_2M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_2M,
336                 [ZD_CS_CCK_RATE_5_5M]   = ZD_CS_CCK|ZD_CS_CCK_RATE_5_5M,
337                 [ZD_CS_CCK_RATE_11M]    = ZD_CS_CCK|ZD_CS_CCK_RATE_11M,
338                 [ZD_OFDM_RATE_6M]       = ZD_CS_OFDM|ZD_OFDM_RATE_6M,
339                 [ZD_OFDM_RATE_9M]       = ZD_CS_OFDM|ZD_OFDM_RATE_9M,
340                 [ZD_OFDM_RATE_12M]      = ZD_CS_OFDM|ZD_OFDM_RATE_12M,
341                 [ZD_OFDM_RATE_18M]      = ZD_CS_OFDM|ZD_OFDM_RATE_18M,
342                 [ZD_OFDM_RATE_24M]      = ZD_CS_OFDM|ZD_OFDM_RATE_24M,
343                 [ZD_OFDM_RATE_36M]      = ZD_CS_OFDM|ZD_OFDM_RATE_36M,
344                 [ZD_OFDM_RATE_48M]      = ZD_CS_OFDM|ZD_OFDM_RATE_48M,
345                 [ZD_OFDM_RATE_54M]      = ZD_CS_OFDM|ZD_OFDM_RATE_54M,
346         };
347
348         ZD_ASSERT(ZD_CS_RATE_MASK == 0x0f);
349         return typed_rates[cs_rate & ZD_CS_RATE_MASK];
350 }
351
352 /* Fallback to lowest rate, if rate is unknown. */
353 static u8 rate_to_cs_rate(u8 rate)
354 {
355         switch (rate) {
356         case IEEE80211_CCK_RATE_2MB:
357                 return ZD_CS_CCK_RATE_2M;
358         case IEEE80211_CCK_RATE_5MB:
359                 return ZD_CS_CCK_RATE_5_5M;
360         case IEEE80211_CCK_RATE_11MB:
361                 return ZD_CS_CCK_RATE_11M;
362         case IEEE80211_OFDM_RATE_6MB:
363                 return ZD_OFDM_RATE_6M;
364         case IEEE80211_OFDM_RATE_9MB:
365                 return ZD_OFDM_RATE_9M;
366         case IEEE80211_OFDM_RATE_12MB:
367                 return ZD_OFDM_RATE_12M;
368         case IEEE80211_OFDM_RATE_18MB:
369                 return ZD_OFDM_RATE_18M;
370         case IEEE80211_OFDM_RATE_24MB:
371                 return ZD_OFDM_RATE_24M;
372         case IEEE80211_OFDM_RATE_36MB:
373                 return ZD_OFDM_RATE_36M;
374         case IEEE80211_OFDM_RATE_48MB:
375                 return ZD_OFDM_RATE_48M;
376         case IEEE80211_OFDM_RATE_54MB:
377                 return ZD_OFDM_RATE_54M;
378         }
379         return ZD_CS_CCK_RATE_1M;
380 }
381
382 int zd_mac_set_mode(struct zd_mac *mac, u32 mode)
383 {
384         struct ieee80211_device *ieee;
385
386         switch (mode) {
387         case IW_MODE_AUTO:
388         case IW_MODE_ADHOC:
389         case IW_MODE_INFRA:
390                 mac->netdev->type = ARPHRD_ETHER;
391                 break;
392         case IW_MODE_MONITOR:
393                 mac->netdev->type = ARPHRD_IEEE80211_RADIOTAP;
394                 break;
395         default:
396                 dev_dbg_f(zd_mac_dev(mac), "wrong mode %u\n", mode);
397                 return -EINVAL;
398         }
399
400         ieee = zd_mac_to_ieee80211(mac);
401         ZD_ASSERT(!irqs_disabled());
402         spin_lock_irq(&ieee->lock);
403         ieee->iw_mode = mode;
404         spin_unlock_irq(&ieee->lock);
405
406         if (netif_running(mac->netdev))
407                 return reset_mode(mac);
408
409         return 0;
410 }
411
412 int zd_mac_get_mode(struct zd_mac *mac, u32 *mode)
413 {
414         unsigned long flags;
415         struct ieee80211_device *ieee;
416
417         ieee = zd_mac_to_ieee80211(mac);
418         spin_lock_irqsave(&ieee->lock, flags);
419         *mode = ieee->iw_mode;
420         spin_unlock_irqrestore(&ieee->lock, flags);
421         return 0;
422 }
423
424 int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range)
425 {
426         int i;
427         const struct channel_range *channel_range;
428         u8 regdomain;
429
430         memset(range, 0, sizeof(*range));
431
432         /* FIXME: Not so important and depends on the mode. For 802.11g
433          * usually this value is used. It seems to be that Bit/s number is
434          * given here.
435          */
436         range->throughput = 27 * 1000 * 1000;
437
438         range->max_qual.qual = 100;
439         range->max_qual.level = 100;
440
441         /* FIXME: Needs still to be tuned. */
442         range->avg_qual.qual = 71;
443         range->avg_qual.level = 80;
444
445         /* FIXME: depends on standard? */
446         range->min_rts = 256;
447         range->max_rts = 2346;
448
449         range->min_frag = MIN_FRAG_THRESHOLD;
450         range->max_frag = MAX_FRAG_THRESHOLD;
451
452         range->max_encoding_tokens = WEP_KEYS;
453         range->num_encoding_sizes = 2;
454         range->encoding_size[0] = 5;
455         range->encoding_size[1] = WEP_KEY_LEN;
456
457         range->we_version_compiled = WIRELESS_EXT;
458         range->we_version_source = 20;
459
460         ZD_ASSERT(!irqs_disabled());
461         spin_lock_irq(&mac->lock);
462         regdomain = mac->regdomain;
463         spin_unlock_irq(&mac->lock);
464         channel_range = zd_channel_range(regdomain);
465
466         range->num_channels = channel_range->end - channel_range->start;
467         range->old_num_channels = range->num_channels;
468         range->num_frequency = range->num_channels;
469         range->old_num_frequency = range->num_frequency;
470
471         for (i = 0; i < range->num_frequency; i++) {
472                 struct iw_freq *freq = &range->freq[i];
473                 freq->i = channel_range->start + i;
474                 zd_channel_to_freq(freq, freq->i);
475         }
476
477         return 0;
478 }
479
480 static int zd_calc_tx_length_us(u8 *service, u8 cs_rate, u16 tx_length)
481 {
482         static const u8 rate_divisor[] = {
483                 [ZD_CS_CCK_RATE_1M]     =  1,
484                 [ZD_CS_CCK_RATE_2M]     =  2,
485                 [ZD_CS_CCK_RATE_5_5M]   = 11, /* bits must be doubled */
486                 [ZD_CS_CCK_RATE_11M]    = 11,
487                 [ZD_OFDM_RATE_6M]       =  6,
488                 [ZD_OFDM_RATE_9M]       =  9,
489                 [ZD_OFDM_RATE_12M]      = 12,
490                 [ZD_OFDM_RATE_18M]      = 18,
491                 [ZD_OFDM_RATE_24M]      = 24,
492                 [ZD_OFDM_RATE_36M]      = 36,
493                 [ZD_OFDM_RATE_48M]      = 48,
494                 [ZD_OFDM_RATE_54M]      = 54,
495         };
496
497         u32 bits = (u32)tx_length * 8;
498         u32 divisor;
499
500         divisor = rate_divisor[cs_rate];
501         if (divisor == 0)
502                 return -EINVAL;
503
504         switch (cs_rate) {
505         case ZD_CS_CCK_RATE_5_5M:
506                 bits = (2*bits) + 10; /* round up to the next integer */
507                 break;
508         case ZD_CS_CCK_RATE_11M:
509                 if (service) {
510                         u32 t = bits % 11;
511                         *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
512                         if (0 < t && t <= 3) {
513                                 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
514                         }
515                 }
516                 bits += 10; /* round up to the next integer */
517                 break;
518         }
519
520         return bits/divisor;
521 }
522
523 enum {
524         R2M_SHORT_PREAMBLE = 0x01,
525         R2M_11A            = 0x02,
526 };
527
528 static u8 cs_rate_to_modulation(u8 cs_rate, int flags)
529 {
530         u8 modulation;
531
532         modulation = cs_typed_rate(cs_rate);
533         if (flags & R2M_SHORT_PREAMBLE) {
534                 switch (ZD_CS_RATE(modulation)) {
535                 case ZD_CS_CCK_RATE_2M:
536                 case ZD_CS_CCK_RATE_5_5M:
537                 case ZD_CS_CCK_RATE_11M:
538                         modulation |= ZD_CS_CCK_PREA_SHORT;
539                         return modulation;
540                 }
541         }
542         if (flags & R2M_11A) {
543                 if (ZD_CS_TYPE(modulation) == ZD_CS_OFDM)
544                         modulation |= ZD_CS_OFDM_MODE_11A;
545         }
546         return modulation;
547 }
548
549 static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs,
550                               struct ieee80211_hdr_4addr *hdr)
551 {
552         struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
553         u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl));
554         u8 rate, cs_rate;
555         int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0;
556
557         /* FIXME: 802.11a? short preamble? */
558         rate = ieee80211softmac_suggest_txrate(softmac,
559                 is_multicast_ether_addr(hdr->addr1), is_mgt);
560
561         cs_rate = rate_to_cs_rate(rate);
562         cs->modulation = cs_rate_to_modulation(cs_rate, 0);
563 }
564
565 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
566                            struct ieee80211_hdr_4addr *header)
567 {
568         unsigned int tx_length = le16_to_cpu(cs->tx_length);
569         u16 fctl = le16_to_cpu(header->frame_ctl);
570         u16 ftype = WLAN_FC_GET_TYPE(fctl);
571         u16 stype = WLAN_FC_GET_STYPE(fctl);
572
573         /*
574          * CONTROL:
575          * - start at 0x00
576          * - if fragment 0, enable bit 0
577          * - if backoff needed, enable bit 0
578          * - if burst (backoff not needed) disable bit 0
579          * - if multicast, enable bit 1
580          * - if PS-POLL frame, enable bit 2
581          * - if in INDEPENDENT_BSS mode and zd1205_DestPowerSave, then enable
582          *   bit 4 (FIXME: wtf)
583          * - if frag_len > RTS threshold, set bit 5 as long if it isnt
584          *   multicast or mgt
585          * - if bit 5 is set, and we are in OFDM mode, unset bit 5 and set bit
586          *   7
587          */
588
589         cs->control = 0;
590
591         /* First fragment */
592         if (WLAN_GET_SEQ_FRAG(le16_to_cpu(header->seq_ctl)) == 0)
593                 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
594
595         /* Multicast */
596         if (is_multicast_ether_addr(header->addr1))
597                 cs->control |= ZD_CS_MULTICAST;
598
599         /* PS-POLL */
600         if (stype == IEEE80211_STYPE_PSPOLL)
601                 cs->control |= ZD_CS_PS_POLL_FRAME;
602
603         if (!is_multicast_ether_addr(header->addr1) &&
604             ftype != IEEE80211_FTYPE_MGMT &&
605             tx_length > zd_netdev_ieee80211(mac->netdev)->rts)
606         {
607                 /* FIXME: check the logic */
608                 if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM) {
609                         /* 802.11g */
610                         cs->control |= ZD_CS_SELF_CTS;
611                 } else { /* 802.11b */
612                         cs->control |= ZD_CS_RTS;
613                 }
614         }
615
616         /* FIXME: Management frame? */
617 }
618
619 static int fill_ctrlset(struct zd_mac *mac,
620                         struct ieee80211_txb *txb,
621                         int frag_num)
622 {
623         int r;
624         struct sk_buff *skb = txb->fragments[frag_num];
625         struct ieee80211_hdr_4addr *hdr =
626                 (struct ieee80211_hdr_4addr *) skb->data;
627         unsigned int frag_len = skb->len + IEEE80211_FCS_LEN;
628         unsigned int next_frag_len;
629         unsigned int packet_length;
630         struct zd_ctrlset *cs = (struct zd_ctrlset *)
631                 skb_push(skb, sizeof(struct zd_ctrlset));
632
633         if (frag_num+1  < txb->nr_frags) {
634                 next_frag_len = txb->fragments[frag_num+1]->len +
635                                 IEEE80211_FCS_LEN;
636         } else {
637                 next_frag_len = 0;
638         }
639         ZD_ASSERT(frag_len <= 0xffff);
640         ZD_ASSERT(next_frag_len <= 0xffff);
641
642         cs_set_modulation(mac, cs, hdr);
643
644         cs->tx_length = cpu_to_le16(frag_len);
645
646         cs_set_control(mac, cs, hdr);
647
648         packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
649         ZD_ASSERT(packet_length <= 0xffff);
650         /* ZD1211B: Computing the length difference this way, gives us
651          * flexibility to compute the packet length.
652          */
653         cs->packet_length = cpu_to_le16(mac->chip.is_zd1211b ?
654                         packet_length - frag_len : packet_length);
655
656         /*
657          * CURRENT LENGTH:
658          * - transmit frame length in microseconds
659          * - seems to be derived from frame length
660          * - see Cal_Us_Service() in zdinlinef.h
661          * - if macp->bTxBurstEnable is enabled, then multiply by 4
662          *  - bTxBurstEnable is never set in the vendor driver
663          *
664          * SERVICE:
665          * - "for PLCP configuration"
666          * - always 0 except in some situations at 802.11b 11M
667          * - see line 53 of zdinlinef.h
668          */
669         cs->service = 0;
670         r = zd_calc_tx_length_us(&cs->service, ZD_CS_RATE(cs->modulation),
671                                  le16_to_cpu(cs->tx_length));
672         if (r < 0)
673                 return r;
674         cs->current_length = cpu_to_le16(r);
675
676         if (next_frag_len == 0) {
677                 cs->next_frame_length = 0;
678         } else {
679                 r = zd_calc_tx_length_us(NULL, ZD_CS_RATE(cs->modulation),
680                                          next_frag_len);
681                 if (r < 0)
682                         return r;
683                 cs->next_frame_length = cpu_to_le16(r);
684         }
685
686         return 0;
687 }
688
689 static int zd_mac_tx(struct zd_mac *mac, struct ieee80211_txb *txb, int pri)
690 {
691         int i, r;
692
693         for (i = 0; i < txb->nr_frags; i++) {
694                 struct sk_buff *skb = txb->fragments[i];
695
696                 r = fill_ctrlset(mac, txb, i);
697                 if (r)
698                         return r;
699                 r = zd_usb_tx(&mac->chip.usb, skb->data, skb->len);
700                 if (r)
701                         return r;
702         }
703
704         /* FIXME: shouldn't this be handled by the upper layers? */
705         mac->netdev->trans_start = jiffies;
706
707         ieee80211_txb_free(txb);
708         return 0;
709 }
710
711 struct zd_rt_hdr {
712         struct ieee80211_radiotap_header rt_hdr;
713         u8  rt_flags;
714         u16 rt_channel;
715         u16 rt_chbitmask;
716         u16 rt_rate;
717 };
718
719 static void fill_rt_header(void *buffer, struct zd_mac *mac,
720                            const struct ieee80211_rx_stats *stats,
721                            const struct rx_status *status)
722 {
723         struct zd_rt_hdr *hdr = buffer;
724
725         hdr->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
726         hdr->rt_hdr.it_pad = 0;
727         hdr->rt_hdr.it_len = cpu_to_le16(sizeof(struct zd_rt_hdr));
728         hdr->rt_hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
729                                  (1 << IEEE80211_RADIOTAP_CHANNEL) |
730                                  (1 << IEEE80211_RADIOTAP_RATE));
731
732         hdr->rt_flags = 0;
733         if (status->decryption_type & (ZD_RX_WEP64|ZD_RX_WEP128|ZD_RX_WEP256))
734                 hdr->rt_flags |= IEEE80211_RADIOTAP_F_WEP;
735
736         /* FIXME: 802.11a */
737         hdr->rt_channel = cpu_to_le16(ieee80211chan2mhz(
738                                              _zd_chip_get_channel(&mac->chip)));
739         hdr->rt_chbitmask = cpu_to_le16(IEEE80211_CHAN_2GHZ |
740                 ((status->frame_status & ZD_RX_FRAME_MODULATION_MASK) ==
741                 ZD_RX_OFDM ? IEEE80211_CHAN_OFDM : IEEE80211_CHAN_CCK));
742
743         hdr->rt_rate = stats->rate / 5;
744 }
745
746 /* Returns 1 if the data packet is for us and 0 otherwise. */
747 static int is_data_packet_for_us(struct ieee80211_device *ieee,
748                                  struct ieee80211_hdr_4addr *hdr)
749 {
750         struct net_device *netdev = ieee->dev;
751         u16 fc = le16_to_cpu(hdr->frame_ctl);
752
753         ZD_ASSERT(WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA);
754
755         switch (ieee->iw_mode) {
756         case IW_MODE_ADHOC:
757                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) != 0 ||
758                     memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) != 0)
759                         return 0;
760                 break;
761         case IW_MODE_AUTO:
762         case IW_MODE_INFRA:
763                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) !=
764                     IEEE80211_FCTL_FROMDS ||
765                     memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) != 0)
766                         return 0;
767                 break;
768         default:
769                 ZD_ASSERT(ieee->iw_mode != IW_MODE_MONITOR);
770                 return 0;
771         }
772
773         return memcmp(hdr->addr1, netdev->dev_addr, ETH_ALEN) == 0 ||
774                is_multicast_ether_addr(hdr->addr1) ||
775                (netdev->flags & IFF_PROMISC);
776 }
777
778 /* Filters receiving packets. If it returns 1 send it to ieee80211_rx, if 0
779  * return. If an error is detected -EINVAL is returned. ieee80211_rx_mgt() is
780  * called here.
781  *
782  * It has been based on ieee80211_rx_any.
783  */
784 static int filter_rx(struct ieee80211_device *ieee,
785                      const u8 *buffer, unsigned int length,
786                      struct ieee80211_rx_stats *stats)
787 {
788         struct ieee80211_hdr_4addr *hdr;
789         u16 fc;
790
791         if (ieee->iw_mode == IW_MODE_MONITOR)
792                 return 1;
793
794         hdr = (struct ieee80211_hdr_4addr *)buffer;
795         fc = le16_to_cpu(hdr->frame_ctl);
796         if ((fc & IEEE80211_FCTL_VERS) != 0)
797                 return -EINVAL;
798
799         switch (WLAN_FC_GET_TYPE(fc)) {
800         case IEEE80211_FTYPE_MGMT:
801                 if (length < sizeof(struct ieee80211_hdr_3addr))
802                         return -EINVAL;
803                 ieee80211_rx_mgt(ieee, hdr, stats);
804                 return 0;
805         case IEEE80211_FTYPE_CTL:
806                 /* Ignore invalid short buffers */
807                 return 0;
808         case IEEE80211_FTYPE_DATA:
809                 if (length < sizeof(struct ieee80211_hdr_3addr))
810                         return -EINVAL;
811                 return is_data_packet_for_us(ieee, hdr);
812         }
813
814         return -EINVAL;
815 }
816
817 static void update_qual_rssi(struct zd_mac *mac, u8 qual_percent, u8 rssi)
818 {
819         unsigned long flags;
820
821         spin_lock_irqsave(&mac->lock, flags);
822         mac->qual_average = (7 * mac->qual_average + qual_percent) / 8;
823         mac->rssi_average = (7 * mac->rssi_average + rssi) / 8;
824         spin_unlock_irqrestore(&mac->lock, flags);
825 }
826
827 static int fill_rx_stats(struct ieee80211_rx_stats *stats,
828                          const struct rx_status **pstatus,
829                          struct zd_mac *mac,
830                          const u8 *buffer, unsigned int length)
831 {
832         const struct rx_status *status;
833
834         *pstatus = status = zd_tail(buffer, length, sizeof(struct rx_status));
835         if (status->frame_status & ZD_RX_ERROR) {
836                 /* FIXME: update? */
837                 return -EINVAL;
838         }
839         memset(stats, 0, sizeof(struct ieee80211_rx_stats));
840         stats->len = length - (ZD_PLCP_HEADER_SIZE + IEEE80211_FCS_LEN +
841                                + sizeof(struct rx_status));
842         /* FIXME: 802.11a */
843         stats->freq = IEEE80211_24GHZ_BAND;
844         stats->received_channel = _zd_chip_get_channel(&mac->chip);
845         stats->rssi = zd_rx_strength_percent(status->signal_strength);
846         stats->signal = zd_rx_qual_percent(buffer,
847                                           length - sizeof(struct rx_status),
848                                           status);
849         stats->mask = IEEE80211_STATMASK_RSSI | IEEE80211_STATMASK_SIGNAL;
850         stats->rate = zd_rx_rate(buffer, status);
851         if (stats->rate)
852                 stats->mask |= IEEE80211_STATMASK_RATE;
853
854         update_qual_rssi(mac, stats->signal, stats->rssi);
855         return 0;
856 }
857
858 int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
859 {
860         int r;
861         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
862         struct ieee80211_rx_stats stats;
863         const struct rx_status *status;
864         struct sk_buff *skb;
865
866         if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
867                      IEEE80211_FCS_LEN + sizeof(struct rx_status))
868                 return -EINVAL;
869
870         r = fill_rx_stats(&stats, &status, mac, buffer, length);
871         if (r)
872                 return r;
873
874         length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
875                   sizeof(struct rx_status);
876         buffer += ZD_PLCP_HEADER_SIZE;
877
878         r = filter_rx(ieee, buffer, length, &stats);
879         if (r <= 0)
880                 return r;
881
882         skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
883         if (!skb)
884                 return -ENOMEM;
885         if (ieee->iw_mode == IW_MODE_MONITOR)
886                 fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
887                                &stats, status);
888         memcpy(skb_put(skb, length), buffer, length);
889
890         r = ieee80211_rx(ieee, skb, &stats);
891         if (!r) {
892                 ZD_ASSERT(in_irq());
893                 dev_kfree_skb_irq(skb);
894         }
895         return 0;
896 }
897
898 static int netdev_tx(struct ieee80211_txb *txb, struct net_device *netdev,
899                      int pri)
900 {
901         return zd_mac_tx(zd_netdev_mac(netdev), txb, pri);
902 }
903
904 static void set_security(struct net_device *netdev,
905                          struct ieee80211_security *sec)
906 {
907         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
908         struct ieee80211_security *secinfo = &ieee->sec;
909         int keyidx;
910
911         dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)), "\n");
912
913         for (keyidx = 0; keyidx<WEP_KEYS; keyidx++)
914                 if (sec->flags & (1<<keyidx)) {
915                         secinfo->encode_alg[keyidx] = sec->encode_alg[keyidx];
916                         secinfo->key_sizes[keyidx] = sec->key_sizes[keyidx];
917                         memcpy(secinfo->keys[keyidx], sec->keys[keyidx],
918                                SCM_KEY_LEN);
919                 }
920
921         if (sec->flags & SEC_ACTIVE_KEY) {
922                 secinfo->active_key = sec->active_key;
923                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
924                         "   .active_key = %d\n", sec->active_key);
925         }
926         if (sec->flags & SEC_UNICAST_GROUP) {
927                 secinfo->unicast_uses_group = sec->unicast_uses_group;
928                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
929                         "   .unicast_uses_group = %d\n",
930                         sec->unicast_uses_group);
931         }
932         if (sec->flags & SEC_LEVEL) {
933                 secinfo->level = sec->level;
934                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
935                         "   .level = %d\n", sec->level);
936         }
937         if (sec->flags & SEC_ENABLED) {
938                 secinfo->enabled = sec->enabled;
939                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
940                         "   .enabled = %d\n", sec->enabled);
941         }
942         if (sec->flags & SEC_ENCRYPT) {
943                 secinfo->encrypt = sec->encrypt;
944                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
945                         "   .encrypt = %d\n", sec->encrypt);
946         }
947         if (sec->flags & SEC_AUTH_MODE) {
948                 secinfo->auth_mode = sec->auth_mode;
949                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
950                         "   .auth_mode = %d\n", sec->auth_mode);
951         }
952 }
953
954 static void ieee_init(struct ieee80211_device *ieee)
955 {
956         ieee->mode = IEEE_B | IEEE_G;
957         ieee->freq_band = IEEE80211_24GHZ_BAND;
958         ieee->modulation = IEEE80211_OFDM_MODULATION | IEEE80211_CCK_MODULATION;
959         ieee->tx_headroom = sizeof(struct zd_ctrlset);
960         ieee->set_security = set_security;
961         ieee->hard_start_xmit = netdev_tx;
962
963         /* Software encryption/decryption for now */
964         ieee->host_build_iv = 0;
965         ieee->host_encrypt = 1;
966         ieee->host_decrypt = 1;
967
968         /* FIXME: default to managed mode, until ieee80211 and zd1211rw can
969          * correctly support AUTO */
970         ieee->iw_mode = IW_MODE_INFRA;
971 }
972
973 static void softmac_init(struct ieee80211softmac_device *sm)
974 {
975         sm->set_channel = set_channel;
976 }
977
978 struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
979 {
980         struct zd_mac *mac = zd_netdev_mac(ndev);
981         struct iw_statistics *iw_stats = &mac->iw_stats;
982
983         memset(iw_stats, 0, sizeof(struct iw_statistics));
984         /* We are not setting the status, because ieee->state is not updated
985          * at all and this driver doesn't track authentication state.
986          */
987         spin_lock_irq(&mac->lock);
988         iw_stats->qual.qual = mac->qual_average;
989         iw_stats->qual.level = mac->rssi_average;
990         iw_stats->qual.updated = IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED|
991                                  IW_QUAL_NOISE_INVALID;
992         spin_unlock_irq(&mac->lock);
993         /* TODO: update counter */
994         return iw_stats;
995 }
996
997 #ifdef DEBUG
998 static const char* decryption_types[] = {
999         [ZD_RX_NO_WEP] = "none",
1000         [ZD_RX_WEP64] = "WEP64",
1001         [ZD_RX_TKIP] = "TKIP",
1002         [ZD_RX_AES] = "AES",
1003         [ZD_RX_WEP128] = "WEP128",
1004         [ZD_RX_WEP256] = "WEP256",
1005 };
1006
1007 static const char *decryption_type_string(u8 type)
1008 {
1009         const char *s;
1010
1011         if (type < ARRAY_SIZE(decryption_types)) {
1012                 s = decryption_types[type];
1013         } else {
1014                 s = NULL;
1015         }
1016         return s ? s : "unknown";
1017 }
1018
1019 static int is_ofdm(u8 frame_status)
1020 {
1021         return (frame_status & ZD_RX_OFDM);
1022 }
1023
1024 void zd_dump_rx_status(const struct rx_status *status)
1025 {
1026         const char* modulation;
1027         u8 quality;
1028
1029         if (is_ofdm(status->frame_status)) {
1030                 modulation = "ofdm";
1031                 quality = status->signal_quality_ofdm;
1032         } else {
1033                 modulation = "cck";
1034                 quality = status->signal_quality_cck;
1035         }
1036         pr_debug("rx status %s strength %#04x qual %#04x decryption %s\n",
1037                 modulation, status->signal_strength, quality,
1038                 decryption_type_string(status->decryption_type));
1039         if (status->frame_status & ZD_RX_ERROR) {
1040                 pr_debug("rx error %s%s%s%s%s%s\n",
1041                         (status->frame_status & ZD_RX_TIMEOUT_ERROR) ?
1042                                 "timeout " : "",
1043                         (status->frame_status & ZD_RX_FIFO_OVERRUN_ERROR) ?
1044                                 "fifo " : "",
1045                         (status->frame_status & ZD_RX_DECRYPTION_ERROR) ?
1046                                 "decryption " : "",
1047                         (status->frame_status & ZD_RX_CRC32_ERROR) ?
1048                                 "crc32 " : "",
1049                         (status->frame_status & ZD_RX_NO_ADDR1_MATCH_ERROR) ?
1050                                 "addr1 " : "",
1051                         (status->frame_status & ZD_RX_CRC16_ERROR) ?
1052                                 "crc16" : "");
1053         }
1054 }
1055 #endif /* DEBUG */