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 static void housekeeping_init(struct zd_mac *mac);
  37 static void housekeeping_enable(struct zd_mac *mac);
  38 static void housekeeping_disable(struct zd_mac *mac);
  39
  40 int zd_mac_init(struct zd_mac *mac,
  41                 struct net_device *netdev,
  42                 struct usb_interface *intf)
  43 {
  44         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
  45
  46         memset(mac, 0, sizeof(*mac));
  47         spin_lock_init(&mac->lock);
  48         mac->netdev = netdev;
  49
  50         ieee_init(ieee);
  51         softmac_init(ieee80211_priv(netdev));
  52         zd_chip_init(&mac->chip, netdev, intf);
  53         housekeeping_init(mac);
  54         return 0;
  55 }
  56
  57 static int reset_channel(struct zd_mac *mac)
  58 {
  59         int r;
  60         unsigned long flags;
  61         const struct channel_range *range;
  62
  63         spin_lock_irqsave(&mac->lock, flags);
  64         range = zd_channel_range(mac->regdomain);
  65         if (!range->start) {
  66                 r = -EINVAL;
  67                 goto out;
  68         }
  69         mac->requested_channel = range->start;
  70         r = 0;
  71 out:
  72         spin_unlock_irqrestore(&mac->lock, flags);
  73         return r;
  74 }
  75
  76 int zd_mac_init_hw(struct zd_mac *mac, u8 device_type)
  77 {
  78         int r;
  79         struct zd_chip *chip = &mac->chip;
  80         u8 addr[ETH_ALEN];
  81         u8 default_regdomain;
  82
  83         r = zd_chip_enable_int(chip);
  84         if (r)
  85                 goto out;
  86         r = zd_chip_init_hw(chip, device_type);
  87         if (r)
  88                 goto disable_int;
  89
  90         zd_get_e2p_mac_addr(chip, addr);
  91         r = zd_write_mac_addr(chip, addr);
  92         if (r)
  93                 goto disable_int;
  94         ZD_ASSERT(!irqs_disabled());
  95         spin_lock_irq(&mac->lock);
  96         memcpy(mac->netdev->dev_addr, addr, ETH_ALEN);
  97         spin_unlock_irq(&mac->lock);
  98
  99         r = zd_read_regdomain(chip, &default_regdomain);
 100         if (r)
 101                 goto disable_int;
 102         if (!zd_regdomain_supported(default_regdomain)) {
 103                 dev_dbg_f(zd_mac_dev(mac),
 104                           "Regulatory Domain %#04x is not supported.\n",
 105                           default_regdomain);
 106                 r = -EINVAL;
 107                 goto disable_int;
 108         }
 109         spin_lock_irq(&mac->lock);
 110         mac->regdomain = mac->default_regdomain = default_regdomain;
 111         spin_unlock_irq(&mac->lock);
 112         r = reset_channel(mac);
 113         if (r)
 114                 goto disable_int;
 115
 116         /* We must inform the device that we are doing encryption/decryption in
 117          * software at the moment. */
 118         r = zd_set_encryption_type(chip, ENC_SNIFFER);
 119         if (r)
 120                 goto disable_int;
 121
 122         r = zd_geo_init(zd_mac_to_ieee80211(mac), mac->regdomain);
 123         if (r)
 124                 goto disable_int;
 125
 126         r = 0;
 127 disable_int:
 128         zd_chip_disable_int(chip);
 129 out:
 130         return r;
 131 }
 132
 133 void zd_mac_clear(struct zd_mac *mac)
 134 {
 135         zd_chip_clear(&mac->chip);
 136         ZD_ASSERT(!spin_is_locked(&mac->lock));
 137         ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
 138 }
 139
 140 static int reset_mode(struct zd_mac *mac)
 141 {
 142         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 143         struct zd_ioreq32 ioreqs[3] = {
 144                 { CR_RX_FILTER, STA_RX_FILTER },
 145                 { CR_SNIFFER_ON, 0U },
 146         };
 147
 148         if (ieee->iw_mode == IW_MODE_MONITOR) {
 149                 ioreqs[0].value = 0xffffffff;
 150                 ioreqs[1].value = 0x1;
 151                 ioreqs[2].value = ENC_SNIFFER;
 152         }
 153
 154         return zd_iowrite32a(&mac->chip, ioreqs, 3);
 155 }
 156
 157 int zd_mac_open(struct net_device *netdev)
 158 {
 159         struct zd_mac *mac = zd_netdev_mac(netdev);
 160         struct zd_chip *chip = &mac->chip;
 161         int r;
 162
 163         r = zd_chip_enable_int(chip);
 164         if (r < 0)
 165                 goto out;
 166
 167         r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
 168         if (r < 0)
 169                 goto disable_int;
 170         r = reset_mode(mac);
 171         if (r)
 172                 goto disable_int;
 173         r = zd_chip_switch_radio_on(chip);
 174         if (r < 0)
 175                 goto disable_int;
 176         r = zd_chip_set_channel(chip, mac->requested_channel);
 177         if (r < 0)
 178                 goto disable_radio;
 179         r = zd_chip_enable_rx(chip);
 180         if (r < 0)
 181                 goto disable_radio;
 182         r = zd_chip_enable_hwint(chip);
 183         if (r < 0)
 184                 goto disable_rx;
 185
 186         housekeeping_enable(mac);
 187         ieee80211softmac_start(netdev);
 188         return 0;
 189 disable_rx:
 190         zd_chip_disable_rx(chip);
 191 disable_radio:
 192         zd_chip_switch_radio_off(chip);
 193 disable_int:
 194         zd_chip_disable_int(chip);
 195 out:
 196         return r;
 197 }
 198
 199 int zd_mac_stop(struct net_device *netdev)
 200 {
 201         struct zd_mac *mac = zd_netdev_mac(netdev);
 202         struct zd_chip *chip = &mac->chip;
 203
 204         netif_stop_queue(netdev);
 205
 206         /*
 207          * The order here deliberately is a little different from the open()
 208          * method, since we need to make sure there is no opportunity for RX
 209          * frames to be processed by softmac after we have stopped it.
 210          */
 211
 212         zd_chip_disable_rx(chip);
 213         housekeeping_disable(mac);
 214         ieee80211softmac_stop(netdev);
 215
 216         zd_chip_disable_hwint(chip);
 217         zd_chip_switch_radio_off(chip);
 218         zd_chip_disable_int(chip);
 219
 220         return 0;
 221 }
 222
 223 int zd_mac_set_mac_address(struct net_device *netdev, void *p)
 224 {
 225         int r;
 226         unsigned long flags;
 227         struct sockaddr *addr = p;
 228         struct zd_mac *mac = zd_netdev_mac(netdev);
 229         struct zd_chip *chip = &mac->chip;
 230
 231         if (!is_valid_ether_addr(addr->sa_data))
 232                 return -EADDRNOTAVAIL;
 233
 234         dev_dbg_f(zd_mac_dev(mac),
 235                   "Setting MAC to " MAC_FMT "\n", MAC_ARG(addr->sa_data));
 236
 237         r = zd_write_mac_addr(chip, addr->sa_data);
 238         if (r)
 239                 return r;
 240
 241         spin_lock_irqsave(&mac->lock, flags);
 242         memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
 243         spin_unlock_irqrestore(&mac->lock, flags);
 244
 245         return 0;
 246 }
 247
 248 int zd_mac_set_regdomain(struct zd_mac *mac, u8 regdomain)
 249 {
 250         int r;
 251         u8 channel;
 252
 253         ZD_ASSERT(!irqs_disabled());
 254         spin_lock_irq(&mac->lock);
 255         if (regdomain == 0) {
 256                 regdomain = mac->default_regdomain;
 257         }
 258         if (!zd_regdomain_supported(regdomain)) {
 259                 spin_unlock_irq(&mac->lock);
 260                 return -EINVAL;
 261         }
 262         mac->regdomain = regdomain;
 263         channel = mac->requested_channel;
 264         spin_unlock_irq(&mac->lock);
 265
 266         r = zd_geo_init(zd_mac_to_ieee80211(mac), regdomain);
 267         if (r)
 268                 return r;
 269         if (!zd_regdomain_supports_channel(regdomain, channel)) {
 270                 r = reset_channel(mac);
 271                 if (r)
 272                         return r;
 273         }
 274
 275         return 0;
 276 }
 277
 278 u8 zd_mac_get_regdomain(struct zd_mac *mac)
 279 {
 280         unsigned long flags;
 281         u8 regdomain;
 282
 283         spin_lock_irqsave(&mac->lock, flags);
 284         regdomain = mac->regdomain;
 285         spin_unlock_irqrestore(&mac->lock, flags);
 286         return regdomain;
 287 }
 288
 289 static void set_channel(struct net_device *netdev, u8 channel)
 290 {
 291         struct zd_mac *mac = zd_netdev_mac(netdev);
 292
 293         dev_dbg_f(zd_mac_dev(mac), "channel %d\n", channel);
 294
 295         zd_chip_set_channel(&mac->chip, channel);
 296 }
 297
 298 /* TODO: Should not work in Managed mode. */
 299 int zd_mac_request_channel(struct zd_mac *mac, u8 channel)
 300 {
 301         unsigned long lock_flags;
 302         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 303
 304         if (ieee->iw_mode == IW_MODE_INFRA)
 305                 return -EPERM;
 306
 307         spin_lock_irqsave(&mac->lock, lock_flags);
 308         if (!zd_regdomain_supports_channel(mac->regdomain, channel)) {
 309                 spin_unlock_irqrestore(&mac->lock, lock_flags);
 310                 return -EINVAL;
 311         }
 312         mac->requested_channel = channel;
 313         spin_unlock_irqrestore(&mac->lock, lock_flags);
 314         if (netif_running(mac->netdev))
 315                 return zd_chip_set_channel(&mac->chip, channel);
 316         else
 317                 return 0;
 318 }
 319
 320 u8 zd_mac_get_channel(struct zd_mac *mac)
 321 {
 322         u8 channel = zd_chip_get_channel(&mac->chip);
 323
 324         dev_dbg_f(zd_mac_dev(mac), "channel %u\n", channel);
 325         return channel;
 326 }
 327
 328 /* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */
 329 static u8 cs_typed_rate(u8 cs_rate)
 330 {
 331         static const u8 typed_rates[16] = {
 332                 [ZD_CS_CCK_RATE_1M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_1M,
 333                 [ZD_CS_CCK_RATE_2M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_2M,
 334                 [ZD_CS_CCK_RATE_5_5M]   = ZD_CS_CCK|ZD_CS_CCK_RATE_5_5M,
 335                 [ZD_CS_CCK_RATE_11M]    = ZD_CS_CCK|ZD_CS_CCK_RATE_11M,
 336                 [ZD_OFDM_RATE_6M]       = ZD_CS_OFDM|ZD_OFDM_RATE_6M,
 337                 [ZD_OFDM_RATE_9M]       = ZD_CS_OFDM|ZD_OFDM_RATE_9M,
 338                 [ZD_OFDM_RATE_12M]      = ZD_CS_OFDM|ZD_OFDM_RATE_12M,
 339                 [ZD_OFDM_RATE_18M]      = ZD_CS_OFDM|ZD_OFDM_RATE_18M,
 340                 [ZD_OFDM_RATE_24M]      = ZD_CS_OFDM|ZD_OFDM_RATE_24M,
 341                 [ZD_OFDM_RATE_36M]      = ZD_CS_OFDM|ZD_OFDM_RATE_36M,
 342                 [ZD_OFDM_RATE_48M]      = ZD_CS_OFDM|ZD_OFDM_RATE_48M,
 343                 [ZD_OFDM_RATE_54M]      = ZD_CS_OFDM|ZD_OFDM_RATE_54M,
 344         };
 345
 346         ZD_ASSERT(ZD_CS_RATE_MASK == 0x0f);
 347         return typed_rates[cs_rate & ZD_CS_RATE_MASK];
 348 }
 349
 350 /* Fallback to lowest rate, if rate is unknown. */
 351 static u8 rate_to_cs_rate(u8 rate)
 352 {
 353         switch (rate) {
 354         case IEEE80211_CCK_RATE_2MB:
 355                 return ZD_CS_CCK_RATE_2M;
 356         case IEEE80211_CCK_RATE_5MB:
 357                 return ZD_CS_CCK_RATE_5_5M;
 358         case IEEE80211_CCK_RATE_11MB:
 359                 return ZD_CS_CCK_RATE_11M;
 360         case IEEE80211_OFDM_RATE_6MB:
 361                 return ZD_OFDM_RATE_6M;
 362         case IEEE80211_OFDM_RATE_9MB:
 363                 return ZD_OFDM_RATE_9M;
 364         case IEEE80211_OFDM_RATE_12MB:
 365                 return ZD_OFDM_RATE_12M;
 366         case IEEE80211_OFDM_RATE_18MB:
 367                 return ZD_OFDM_RATE_18M;
 368         case IEEE80211_OFDM_RATE_24MB:
 369                 return ZD_OFDM_RATE_24M;
 370         case IEEE80211_OFDM_RATE_36MB:
 371                 return ZD_OFDM_RATE_36M;
 372         case IEEE80211_OFDM_RATE_48MB:
 373                 return ZD_OFDM_RATE_48M;
 374         case IEEE80211_OFDM_RATE_54MB:
 375                 return ZD_OFDM_RATE_54M;
 376         }
 377         return ZD_CS_CCK_RATE_1M;
 378 }
 379
 380 int zd_mac_set_mode(struct zd_mac *mac, u32 mode)
 381 {
 382         struct ieee80211_device *ieee;
 383
 384         switch (mode) {
 385         case IW_MODE_AUTO:
 386         case IW_MODE_ADHOC:
 387         case IW_MODE_INFRA:
 388                 mac->netdev->type = ARPHRD_ETHER;
 389                 break;
 390         case IW_MODE_MONITOR:
 391                 mac->netdev->type = ARPHRD_IEEE80211_RADIOTAP;
 392                 break;
 393         default:
 394                 dev_dbg_f(zd_mac_dev(mac), "wrong mode %u\n", mode);
 395                 return -EINVAL;
 396         }
 397
 398         ieee = zd_mac_to_ieee80211(mac);
 399         ZD_ASSERT(!irqs_disabled());
 400         spin_lock_irq(&ieee->lock);
 401         ieee->iw_mode = mode;
 402         spin_unlock_irq(&ieee->lock);
 403
 404         if (netif_running(mac->netdev))
 405                 return reset_mode(mac);
 406
 407         return 0;
 408 }
 409
 410 int zd_mac_get_mode(struct zd_mac *mac, u32 *mode)
 411 {
 412         unsigned long flags;
 413         struct ieee80211_device *ieee;
 414
 415         ieee = zd_mac_to_ieee80211(mac);
 416         spin_lock_irqsave(&ieee->lock, flags);
 417         *mode = ieee->iw_mode;
 418         spin_unlock_irqrestore(&ieee->lock, flags);
 419         return 0;
 420 }
 421
 422 int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range)
 423 {
 424         int i;
 425         const struct channel_range *channel_range;
 426         u8 regdomain;
 427
 428         memset(range, 0, sizeof(*range));
 429
 430         /* FIXME: Not so important and depends on the mode. For 802.11g
 431          * usually this value is used. It seems to be that Bit/s number is
 432          * given here.
 433          */
 434         range->throughput = 27 * 1000 * 1000;
 435
 436         range->max_qual.qual = 100;
 437         range->max_qual.level = 100;
 438
 439         /* FIXME: Needs still to be tuned. */
 440         range->avg_qual.qual = 71;
 441         range->avg_qual.level = 80;
 442
 443         /* FIXME: depends on standard? */
 444         range->min_rts = 256;
 445         range->max_rts = 2346;
 446
 447         range->min_frag = MIN_FRAG_THRESHOLD;
 448         range->max_frag = MAX_FRAG_THRESHOLD;
 449
 450         range->max_encoding_tokens = WEP_KEYS;
 451         range->num_encoding_sizes = 2;
 452         range->encoding_size[0] = 5;
 453         range->encoding_size[1] = WEP_KEY_LEN;
 454
 455         range->we_version_compiled = WIRELESS_EXT;
 456         range->we_version_source = 20;
 457
 458         ZD_ASSERT(!irqs_disabled());
 459         spin_lock_irq(&mac->lock);
 460         regdomain = mac->regdomain;
 461         spin_unlock_irq(&mac->lock);
 462         channel_range = zd_channel_range(regdomain);
 463
 464         range->num_channels = channel_range->end - channel_range->start;
 465         range->old_num_channels = range->num_channels;
 466         range->num_frequency = range->num_channels;
 467         range->old_num_frequency = range->num_frequency;
 468
 469         for (i = 0; i < range->num_frequency; i++) {
 470                 struct iw_freq *freq = &range->freq[i];
 471                 freq->i = channel_range->start + i;
 472                 zd_channel_to_freq(freq, freq->i);
 473         }
 474
 475         return 0;
 476 }
 477
 478 static int zd_calc_tx_length_us(u8 *service, u8 cs_rate, u16 tx_length)
 479 {
 480         static const u8 rate_divisor[] = {
 481                 [ZD_CS_CCK_RATE_1M]     =  1,
 482                 [ZD_CS_CCK_RATE_2M]     =  2,
 483                 [ZD_CS_CCK_RATE_5_5M]   = 11, /* bits must be doubled */
 484                 [ZD_CS_CCK_RATE_11M]    = 11,
 485                 [ZD_OFDM_RATE_6M]       =  6,
 486                 [ZD_OFDM_RATE_9M]       =  9,
 487                 [ZD_OFDM_RATE_12M]      = 12,
 488                 [ZD_OFDM_RATE_18M]      = 18,
 489                 [ZD_OFDM_RATE_24M]      = 24,
 490                 [ZD_OFDM_RATE_36M]      = 36,
 491                 [ZD_OFDM_RATE_48M]      = 48,
 492                 [ZD_OFDM_RATE_54M]      = 54,
 493         };
 494
 495         u32 bits = (u32)tx_length * 8;
 496         u32 divisor;
 497
 498         divisor = rate_divisor[cs_rate];
 499         if (divisor == 0)
 500                 return -EINVAL;
 501
 502         switch (cs_rate) {
 503         case ZD_CS_CCK_RATE_5_5M:
 504                 bits = (2*bits) + 10; /* round up to the next integer */
 505                 break;
 506         case ZD_CS_CCK_RATE_11M:
 507                 if (service) {
 508                         u32 t = bits % 11;
 509                         *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 510                         if (0 < t && t <= 3) {
 511                                 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 512                         }
 513                 }
 514                 bits += 10; /* round up to the next integer */
 515                 break;
 516         }
 517
 518         return bits/divisor;
 519 }
 520
 521 enum {
 522         R2M_SHORT_PREAMBLE = 0x01,
 523         R2M_11A            = 0x02,
 524 };
 525
 526 static u8 cs_rate_to_modulation(u8 cs_rate, int flags)
 527 {
 528         u8 modulation;
 529
 530         modulation = cs_typed_rate(cs_rate);
 531         if (flags & R2M_SHORT_PREAMBLE) {
 532                 switch (ZD_CS_RATE(modulation)) {
 533                 case ZD_CS_CCK_RATE_2M:
 534                 case ZD_CS_CCK_RATE_5_5M:
 535                 case ZD_CS_CCK_RATE_11M:
 536                         modulation |= ZD_CS_CCK_PREA_SHORT;
 537                         return modulation;
 538                 }
 539         }
 540         if (flags & R2M_11A) {
 541                 if (ZD_CS_TYPE(modulation) == ZD_CS_OFDM)
 542                         modulation |= ZD_CS_OFDM_MODE_11A;
 543         }
 544         return modulation;
 545 }
 546
 547 static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs,
 548                               struct ieee80211_hdr_4addr *hdr)
 549 {
 550         struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
 551         u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl));
 552         u8 rate, cs_rate;
 553         int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0;
 554
 555         /* FIXME: 802.11a? short preamble? */
 556         rate = ieee80211softmac_suggest_txrate(softmac,
 557                 is_multicast_ether_addr(hdr->addr1), is_mgt);
 558
 559         cs_rate = rate_to_cs_rate(rate);
 560         cs->modulation = cs_rate_to_modulation(cs_rate, 0);
 561 }
 562
 563 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 564                            struct ieee80211_hdr_4addr *header)
 565 {
 566         unsigned int tx_length = le16_to_cpu(cs->tx_length);
 567         u16 fctl = le16_to_cpu(header->frame_ctl);
 568         u16 ftype = WLAN_FC_GET_TYPE(fctl);
 569         u16 stype = WLAN_FC_GET_STYPE(fctl);
 570
 571         /*
 572          * CONTROL:
 573          * - start at 0x00
 574          * - if fragment 0, enable bit 0
 575          * - if backoff needed, enable bit 0
 576          * - if burst (backoff not needed) disable bit 0
 577          * - if multicast, enable bit 1
 578          * - if PS-POLL frame, enable bit 2
 579          * - if in INDEPENDENT_BSS mode and zd1205_DestPowerSave, then enable
 580          *   bit 4 (FIXME: wtf)
 581          * - if frag_len > RTS threshold, set bit 5 as long if it isnt
 582          *   multicast or mgt
 583          * - if bit 5 is set, and we are in OFDM mode, unset bit 5 and set bit
 584          *   7
 585          */
 586
 587         cs->control = 0;
 588
 589         /* First fragment */
 590         if (WLAN_GET_SEQ_FRAG(le16_to_cpu(header->seq_ctl)) == 0)
 591                 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 592
 593         /* Multicast */
 594         if (is_multicast_ether_addr(header->addr1))
 595                 cs->control |= ZD_CS_MULTICAST;
 596
 597         /* PS-POLL */
 598         if (stype == IEEE80211_STYPE_PSPOLL)
 599                 cs->control |= ZD_CS_PS_POLL_FRAME;
 600
 601         if (!is_multicast_ether_addr(header->addr1) &&
 602             ftype != IEEE80211_FTYPE_MGMT &&
 603             tx_length > zd_netdev_ieee80211(mac->netdev)->rts)
 604         {
 605                 /* FIXME: check the logic */
 606                 if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM) {
 607                         /* 802.11g */
 608                         cs->control |= ZD_CS_SELF_CTS;
 609                 } else { /* 802.11b */
 610                         cs->control |= ZD_CS_RTS;
 611                 }
 612         }
 613
 614         /* FIXME: Management frame? */
 615 }
 616
 617 static int fill_ctrlset(struct zd_mac *mac,
 618                         struct ieee80211_txb *txb,
 619                         int frag_num)
 620 {
 621         int r;
 622         struct sk_buff *skb = txb->fragments[frag_num];
 623         struct ieee80211_hdr_4addr *hdr =
 624                 (struct ieee80211_hdr_4addr *) skb->data;
 625         unsigned int frag_len = skb->len + IEEE80211_FCS_LEN;
 626         unsigned int next_frag_len;
 627         unsigned int packet_length;
 628         struct zd_ctrlset *cs = (struct zd_ctrlset *)
 629                 skb_push(skb, sizeof(struct zd_ctrlset));
 630
 631         if (frag_num+1  < txb->nr_frags) {
 632                 next_frag_len = txb->fragments[frag_num+1]->len +
 633                                 IEEE80211_FCS_LEN;
 634         } else {
 635                 next_frag_len = 0;
 636         }
 637         ZD_ASSERT(frag_len <= 0xffff);
 638         ZD_ASSERT(next_frag_len <= 0xffff);
 639
 640         cs_set_modulation(mac, cs, hdr);
 641
 642         cs->tx_length = cpu_to_le16(frag_len);
 643
 644         cs_set_control(mac, cs, hdr);
 645
 646         packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
 647         ZD_ASSERT(packet_length <= 0xffff);
 648         /* ZD1211B: Computing the length difference this way, gives us
 649          * flexibility to compute the packet length.
 650          */
 651         cs->packet_length = cpu_to_le16(mac->chip.is_zd1211b ?
 652                         packet_length - frag_len : packet_length);
 653
 654         /*
 655          * CURRENT LENGTH:
 656          * - transmit frame length in microseconds
 657          * - seems to be derived from frame length
 658          * - see Cal_Us_Service() in zdinlinef.h
 659          * - if macp->bTxBurstEnable is enabled, then multiply by 4
 660          *  - bTxBurstEnable is never set in the vendor driver
 661          *
 662          * SERVICE:
 663          * - "for PLCP configuration"
 664          * - always 0 except in some situations at 802.11b 11M
 665          * - see line 53 of zdinlinef.h
 666          */
 667         cs->service = 0;
 668         r = zd_calc_tx_length_us(&cs->service, ZD_CS_RATE(cs->modulation),
 669                                  le16_to_cpu(cs->tx_length));
 670         if (r < 0)
 671                 return r;
 672         cs->current_length = cpu_to_le16(r);
 673
 674         if (next_frag_len == 0) {
 675                 cs->next_frame_length = 0;
 676         } else {
 677                 r = zd_calc_tx_length_us(NULL, ZD_CS_RATE(cs->modulation),
 678                                          next_frag_len);
 679                 if (r < 0)
 680                         return r;
 681                 cs->next_frame_length = cpu_to_le16(r);
 682         }
 683
 684         return 0;
 685 }
 686
 687 static int zd_mac_tx(struct zd_mac *mac, struct ieee80211_txb *txb, int pri)
 688 {
 689         int i, r;
 690
 691         for (i = 0; i < txb->nr_frags; i++) {
 692                 struct sk_buff *skb = txb->fragments[i];
 693
 694                 r = fill_ctrlset(mac, txb, i);
 695                 if (r)
 696                         return r;
 697                 r = zd_usb_tx(&mac->chip.usb, skb->data, skb->len);
 698                 if (r)
 699                         return r;
 700         }
 701
 702         /* FIXME: shouldn't this be handled by the upper layers? */
 703         mac->netdev->trans_start = jiffies;
 704
 705         ieee80211_txb_free(txb);
 706         return 0;
 707 }
 708
 709 struct zd_rt_hdr {
 710         struct ieee80211_radiotap_header rt_hdr;
 711         u8  rt_flags;
 712         u8  rt_rate;
 713         u16 rt_channel;
 714         u16 rt_chbitmask;
 715 } __attribute__((packed));
 716
 717 static void fill_rt_header(void *buffer, struct zd_mac *mac,
 718                            const struct ieee80211_rx_stats *stats,
 719                            const struct rx_status *status)
 720 {
 721         struct zd_rt_hdr *hdr = buffer;
 722
 723         hdr->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 724         hdr->rt_hdr.it_pad = 0;
 725         hdr->rt_hdr.it_len = cpu_to_le16(sizeof(struct zd_rt_hdr));
 726         hdr->rt_hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 727                                  (1 << IEEE80211_RADIOTAP_CHANNEL) |
 728                                  (1 << IEEE80211_RADIOTAP_RATE));
 729
 730         hdr->rt_flags = 0;
 731         if (status->decryption_type & (ZD_RX_WEP64|ZD_RX_WEP128|ZD_RX_WEP256))
 732                 hdr->rt_flags |= IEEE80211_RADIOTAP_F_WEP;
 733
 734         hdr->rt_rate = stats->rate / 5;
 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
 744 /* Returns 1 if the data packet is for us and 0 otherwise. */
 745 static int is_data_packet_for_us(struct ieee80211_device *ieee,
 746                                  struct ieee80211_hdr_4addr *hdr)
 747 {
 748         struct net_device *netdev = ieee->dev;
 749         u16 fc = le16_to_cpu(hdr->frame_ctl);
 750
 751         ZD_ASSERT(WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA);
 752
 753         switch (ieee->iw_mode) {
 754         case IW_MODE_ADHOC:
 755                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) != 0 ||
 756                     memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) != 0)
 757                         return 0;
 758                 break;
 759         case IW_MODE_AUTO:
 760         case IW_MODE_INFRA:
 761                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) !=
 762                     IEEE80211_FCTL_FROMDS ||
 763                     memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) != 0)
 764                         return 0;
 765                 break;
 766         default:
 767                 ZD_ASSERT(ieee->iw_mode != IW_MODE_MONITOR);
 768                 return 0;
 769         }
 770
 771         return memcmp(hdr->addr1, netdev->dev_addr, ETH_ALEN) == 0 ||
 772                is_multicast_ether_addr(hdr->addr1) ||
 773                (netdev->flags & IFF_PROMISC);
 774 }
 775
 776 /* Filters receiving packets. If it returns 1 send it to ieee80211_rx, if 0
 777  * return. If an error is detected -EINVAL is returned. ieee80211_rx_mgt() is
 778  * called here.
 779  *
 780  * It has been based on ieee80211_rx_any.
 781  */
 782 static int filter_rx(struct ieee80211_device *ieee,
 783                      const u8 *buffer, unsigned int length,
 784                      struct ieee80211_rx_stats *stats)
 785 {
 786         struct ieee80211_hdr_4addr *hdr;
 787         u16 fc;
 788
 789         if (ieee->iw_mode == IW_MODE_MONITOR)
 790                 return 1;
 791
 792         hdr = (struct ieee80211_hdr_4addr *)buffer;
 793         fc = le16_to_cpu(hdr->frame_ctl);
 794         if ((fc & IEEE80211_FCTL_VERS) != 0)
 795                 return -EINVAL;
 796
 797         switch (WLAN_FC_GET_TYPE(fc)) {
 798         case IEEE80211_FTYPE_MGMT:
 799                 if (length < sizeof(struct ieee80211_hdr_3addr))
 800                         return -EINVAL;
 801                 ieee80211_rx_mgt(ieee, hdr, stats);
 802                 return 0;
 803         case IEEE80211_FTYPE_CTL:
 804                 /* Ignore invalid short buffers */
 805                 return 0;
 806         case IEEE80211_FTYPE_DATA:
 807                 if (length < sizeof(struct ieee80211_hdr_3addr))
 808                         return -EINVAL;
 809                 return is_data_packet_for_us(ieee, hdr);
 810         }
 811
 812         return -EINVAL;
 813 }
 814
 815 static void update_qual_rssi(struct zd_mac *mac,
 816                              const u8 *buffer, unsigned int length,
 817                              u8 qual_percent, u8 rssi_percent)
 818 {
 819         unsigned long flags;
 820         struct ieee80211_hdr_3addr *hdr;
 821         int i;
 822
 823         hdr = (struct ieee80211_hdr_3addr *)buffer;
 824         if (length < offsetof(struct ieee80211_hdr_3addr, addr3))
 825                 return;
 826         if (memcmp(hdr->addr2, zd_mac_to_ieee80211(mac)->bssid, ETH_ALEN) != 0)
 827                 return;
 828
 829         spin_lock_irqsave(&mac->lock, flags);
 830         i = mac->stats_count % ZD_MAC_STATS_BUFFER_SIZE;
 831         mac->qual_buffer[i] = qual_percent;
 832         mac->rssi_buffer[i] = rssi_percent;
 833         mac->stats_count++;
 834         spin_unlock_irqrestore(&mac->lock, flags);
 835 }
 836
 837 static int fill_rx_stats(struct ieee80211_rx_stats *stats,
 838                          const struct rx_status **pstatus,
 839                          struct zd_mac *mac,
 840                          const u8 *buffer, unsigned int length)
 841 {
 842         const struct rx_status *status;
 843
 844         *pstatus = status = zd_tail(buffer, length, sizeof(struct rx_status));
 845         if (status->frame_status & ZD_RX_ERROR) {
 846                 /* FIXME: update? */
 847                 return -EINVAL;
 848         }
 849         memset(stats, 0, sizeof(struct ieee80211_rx_stats));
 850         stats->len = length - (ZD_PLCP_HEADER_SIZE + IEEE80211_FCS_LEN +
 851                                + sizeof(struct rx_status));
 852         /* FIXME: 802.11a */
 853         stats->freq = IEEE80211_24GHZ_BAND;
 854         stats->received_channel = _zd_chip_get_channel(&mac->chip);
 855         stats->rssi = zd_rx_strength_percent(status->signal_strength);
 856         stats->signal = zd_rx_qual_percent(buffer,
 857                                           length - sizeof(struct rx_status),
 858                                           status);
 859         stats->mask = IEEE80211_STATMASK_RSSI | IEEE80211_STATMASK_SIGNAL;
 860         stats->rate = zd_rx_rate(buffer, status);
 861         if (stats->rate)
 862                 stats->mask |= IEEE80211_STATMASK_RATE;
 863
 864         return 0;
 865 }
 866
 867 int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
 868 {
 869         int r;
 870         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 871         struct ieee80211_rx_stats stats;
 872         const struct rx_status *status;
 873         struct sk_buff *skb;
 874
 875         if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
 876                      IEEE80211_FCS_LEN + sizeof(struct rx_status))
 877                 return -EINVAL;
 878
 879         r = fill_rx_stats(&stats, &status, mac, buffer, length);
 880         if (r)
 881                 return r;
 882
 883         length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
 884                   sizeof(struct rx_status);
 885         buffer += ZD_PLCP_HEADER_SIZE;
 886
 887         update_qual_rssi(mac, buffer, length, stats.signal, stats.rssi);
 888
 889         r = filter_rx(ieee, buffer, length, &stats);
 890         if (r <= 0)
 891                 return r;
 892
 893         skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
 894         if (!skb)
 895                 return -ENOMEM;
 896         if (ieee->iw_mode == IW_MODE_MONITOR)
 897                 fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
 898                                &stats, status);
 899         memcpy(skb_put(skb, length), buffer, length);
 900
 901         r = ieee80211_rx(ieee, skb, &stats);
 902         if (!r) {
 903                 ZD_ASSERT(in_irq());
 904                 dev_kfree_skb_irq(skb);
 905         }
 906         return 0;
 907 }
 908
 909 static int netdev_tx(struct ieee80211_txb *txb, struct net_device *netdev,
 910                      int pri)
 911 {
 912         return zd_mac_tx(zd_netdev_mac(netdev), txb, pri);
 913 }
 914
 915 static void set_security(struct net_device *netdev,
 916                          struct ieee80211_security *sec)
 917 {
 918         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
 919         struct ieee80211_security *secinfo = &ieee->sec;
 920         int keyidx;
 921
 922         dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)), "\n");
 923
 924         for (keyidx = 0; keyidx<WEP_KEYS; keyidx++)
 925                 if (sec->flags & (1<<keyidx)) {
 926                         secinfo->encode_alg[keyidx] = sec->encode_alg[keyidx];
 927                         secinfo->key_sizes[keyidx] = sec->key_sizes[keyidx];
 928                         memcpy(secinfo->keys[keyidx], sec->keys[keyidx],
 929                                SCM_KEY_LEN);
 930                 }
 931
 932         if (sec->flags & SEC_ACTIVE_KEY) {
 933                 secinfo->active_key = sec->active_key;
 934                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 935                         "   .active_key = %d\n", sec->active_key);
 936         }
 937         if (sec->flags & SEC_UNICAST_GROUP) {
 938                 secinfo->unicast_uses_group = sec->unicast_uses_group;
 939                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 940                         "   .unicast_uses_group = %d\n",
 941                         sec->unicast_uses_group);
 942         }
 943         if (sec->flags & SEC_LEVEL) {
 944                 secinfo->level = sec->level;
 945                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 946                         "   .level = %d\n", sec->level);
 947         }
 948         if (sec->flags & SEC_ENABLED) {
 949                 secinfo->enabled = sec->enabled;
 950                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 951                         "   .enabled = %d\n", sec->enabled);
 952         }
 953         if (sec->flags & SEC_ENCRYPT) {
 954                 secinfo->encrypt = sec->encrypt;
 955                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 956                         "   .encrypt = %d\n", sec->encrypt);
 957         }
 958         if (sec->flags & SEC_AUTH_MODE) {
 959                 secinfo->auth_mode = sec->auth_mode;
 960                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 961                         "   .auth_mode = %d\n", sec->auth_mode);
 962         }
 963 }
 964
 965 static void ieee_init(struct ieee80211_device *ieee)
 966 {
 967         ieee->mode = IEEE_B | IEEE_G;
 968         ieee->freq_band = IEEE80211_24GHZ_BAND;
 969         ieee->modulation = IEEE80211_OFDM_MODULATION | IEEE80211_CCK_MODULATION;
 970         ieee->tx_headroom = sizeof(struct zd_ctrlset);
 971         ieee->set_security = set_security;
 972         ieee->hard_start_xmit = netdev_tx;
 973
 974         /* Software encryption/decryption for now */
 975         ieee->host_build_iv = 0;
 976         ieee->host_encrypt = 1;
 977         ieee->host_decrypt = 1;
 978
 979         /* FIXME: default to managed mode, until ieee80211 and zd1211rw can
 980          * correctly support AUTO */
 981         ieee->iw_mode = IW_MODE_INFRA;
 982 }
 983
 984 static void softmac_init(struct ieee80211softmac_device *sm)
 985 {
 986         sm->set_channel = set_channel;
 987 }
 988
 989 struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
 990 {
 991         struct zd_mac *mac = zd_netdev_mac(ndev);
 992         struct iw_statistics *iw_stats = &mac->iw_stats;
 993         unsigned int i, count, qual_total, rssi_total;
 994
 995         memset(iw_stats, 0, sizeof(struct iw_statistics));
 996         /* We are not setting the status, because ieee->state is not updated
 997          * at all and this driver doesn't track authentication state.
 998          */
 999         spin_lock_irq(&mac->lock);
1000         count = mac->stats_count < ZD_MAC_STATS_BUFFER_SIZE ?
1001                 mac->stats_count : ZD_MAC_STATS_BUFFER_SIZE;
1002         qual_total = rssi_total = 0;
1003         for (i = 0; i < count; i++) {
1004                 qual_total += mac->qual_buffer[i];
1005                 rssi_total += mac->rssi_buffer[i];
1006         }
1007         spin_unlock_irq(&mac->lock);
1008         iw_stats->qual.updated = IW_QUAL_NOISE_INVALID;
1009         if (count > 0) {
1010                 iw_stats->qual.qual = qual_total / count;
1011                 iw_stats->qual.level = rssi_total / count;
1012                 iw_stats->qual.updated |=
1013                         IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED;
1014         } else {
1015                 iw_stats->qual.updated |=
1016                         IW_QUAL_QUAL_INVALID|IW_QUAL_LEVEL_INVALID;
1017         }
1018         /* TODO: update counter */
1019         return iw_stats;
1020 }
1021
1022 #ifdef DEBUG
1023 static const char* decryption_types[] = {
1024         [ZD_RX_NO_WEP] = "none",
1025         [ZD_RX_WEP64] = "WEP64",
1026         [ZD_RX_TKIP] = "TKIP",
1027         [ZD_RX_AES] = "AES",
1028         [ZD_RX_WEP128] = "WEP128",
1029         [ZD_RX_WEP256] = "WEP256",
1030 };
1031
1032 static const char *decryption_type_string(u8 type)
1033 {
1034         const char *s;
1035
1036         if (type < ARRAY_SIZE(decryption_types)) {
1037                 s = decryption_types[type];
1038         } else {
1039                 s = NULL;
1040         }
1041         return s ? s : "unknown";
1042 }
1043
1044 static int is_ofdm(u8 frame_status)
1045 {
1046         return (frame_status & ZD_RX_OFDM);
1047 }
1048
1049 void zd_dump_rx_status(const struct rx_status *status)
1050 {
1051         const char* modulation;
1052         u8 quality;
1053
1054         if (is_ofdm(status->frame_status)) {
1055                 modulation = "ofdm";
1056                 quality = status->signal_quality_ofdm;
1057         } else {
1058                 modulation = "cck";
1059                 quality = status->signal_quality_cck;
1060         }
1061         pr_debug("rx status %s strength %#04x qual %#04x decryption %s\n",
1062                 modulation, status->signal_strength, quality,
1063                 decryption_type_string(status->decryption_type));
1064         if (status->frame_status & ZD_RX_ERROR) {
1065                 pr_debug("rx error %s%s%s%s%s%s\n",
1066                         (status->frame_status & ZD_RX_TIMEOUT_ERROR) ?
1067                                 "timeout " : "",
1068                         (status->frame_status & ZD_RX_FIFO_OVERRUN_ERROR) ?
1069                                 "fifo " : "",
1070                         (status->frame_status & ZD_RX_DECRYPTION_ERROR) ?
1071                                 "decryption " : "",
1072                         (status->frame_status & ZD_RX_CRC32_ERROR) ?
1073                                 "crc32 " : "",
1074                         (status->frame_status & ZD_RX_NO_ADDR1_MATCH_ERROR) ?
1075                                 "addr1 " : "",
1076                         (status->frame_status & ZD_RX_CRC16_ERROR) ?
1077                                 "crc16" : "");
1078         }
1079 }
1080 #endif /* DEBUG */
1081
1082 #define LINK_LED_WORK_DELAY HZ
1083
1084 static void link_led_handler(void *p)
1085 {
1086         struct zd_mac *mac = p;
1087         struct zd_chip *chip = &mac->chip;
1088         struct ieee80211softmac_device *sm = ieee80211_priv(mac->netdev);
1089         int is_associated;
1090         int r;
1091
1092         spin_lock_irq(&mac->lock);
1093         is_associated = sm->associnfo.associated != 0;
1094         spin_unlock_irq(&mac->lock);
1095
1096         r = zd_chip_control_leds(chip,
1097                                  is_associated ? LED_ASSOCIATED : LED_SCANNING);
1098         if (r)
1099                 dev_err(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
1100
1101         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1102                            LINK_LED_WORK_DELAY);
1103 }
1104
1105 static void housekeeping_init(struct zd_mac *mac)
1106 {
1107         INIT_WORK(&mac->housekeeping.link_led_work, link_led_handler, mac);
1108 }
1109
1110 static void housekeeping_enable(struct zd_mac *mac)
1111 {
1112         dev_dbg_f(zd_mac_dev(mac), "\n");
1113         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1114                            0);
1115 }
1116
1117 static void housekeeping_disable(struct zd_mac *mac)
1118 {
1119         dev_dbg_f(zd_mac_dev(mac), "\n");
1120         cancel_rearming_delayed_workqueue(zd_workqueue,
1121                 &mac->housekeeping.link_led_work);
1122         zd_chip_control_leds(&mac->chip, LED_OFF);
1123 }