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         netif_stop_queue(netdev);
 201
 202         /*
 203          * The order here deliberately is a little different from the open()
 204          * method, since we need to make sure there is no opportunity for RX
 205          * frames to be processed by softmac after we have stopped it.
 206          */
 207
 208         zd_chip_disable_rx(chip);
 209         ieee80211softmac_stop(netdev);
 210
 211         zd_chip_disable_hwint(chip);
 212         zd_chip_switch_radio_off(chip);
 213         zd_chip_disable_int(chip);
 214
 215         return 0;
 216 }
 217
 218 int zd_mac_set_mac_address(struct net_device *netdev, void *p)
 219 {
 220         int r;
 221         unsigned long flags;
 222         struct sockaddr *addr = p;
 223         struct zd_mac *mac = zd_netdev_mac(netdev);
 224         struct zd_chip *chip = &mac->chip;
 225
 226         if (!is_valid_ether_addr(addr->sa_data))
 227                 return -EADDRNOTAVAIL;
 228
 229         dev_dbg_f(zd_mac_dev(mac),
 230                   "Setting MAC to " MAC_FMT "\n", MAC_ARG(addr->sa_data));
 231
 232         r = zd_write_mac_addr(chip, addr->sa_data);
 233         if (r)
 234                 return r;
 235
 236         spin_lock_irqsave(&mac->lock, flags);
 237         memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
 238         spin_unlock_irqrestore(&mac->lock, flags);
 239
 240         return 0;
 241 }
 242
 243 int zd_mac_set_regdomain(struct zd_mac *mac, u8 regdomain)
 244 {
 245         int r;
 246         u8 channel;
 247
 248         ZD_ASSERT(!irqs_disabled());
 249         spin_lock_irq(&mac->lock);
 250         if (regdomain == 0) {
 251                 regdomain = mac->default_regdomain;
 252         }
 253         if (!zd_regdomain_supported(regdomain)) {
 254                 spin_unlock_irq(&mac->lock);
 255                 return -EINVAL;
 256         }
 257         mac->regdomain = regdomain;
 258         channel = mac->requested_channel;
 259         spin_unlock_irq(&mac->lock);
 260
 261         r = zd_geo_init(zd_mac_to_ieee80211(mac), regdomain);
 262         if (r)
 263                 return r;
 264         if (!zd_regdomain_supports_channel(regdomain, channel)) {
 265                 r = reset_channel(mac);
 266                 if (r)
 267                         return r;
 268         }
 269
 270         return 0;
 271 }
 272
 273 u8 zd_mac_get_regdomain(struct zd_mac *mac)
 274 {
 275         unsigned long flags;
 276         u8 regdomain;
 277
 278         spin_lock_irqsave(&mac->lock, flags);
 279         regdomain = mac->regdomain;
 280         spin_unlock_irqrestore(&mac->lock, flags);
 281         return regdomain;
 282 }
 283
 284 static void set_channel(struct net_device *netdev, u8 channel)
 285 {
 286         struct zd_mac *mac = zd_netdev_mac(netdev);
 287
 288         dev_dbg_f(zd_mac_dev(mac), "channel %d\n", channel);
 289
 290         zd_chip_set_channel(&mac->chip, channel);
 291 }
 292
 293 /* TODO: Should not work in Managed mode. */
 294 int zd_mac_request_channel(struct zd_mac *mac, u8 channel)
 295 {
 296         unsigned long lock_flags;
 297         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 298
 299         if (ieee->iw_mode == IW_MODE_INFRA)
 300                 return -EPERM;
 301
 302         spin_lock_irqsave(&mac->lock, lock_flags);
 303         if (!zd_regdomain_supports_channel(mac->regdomain, channel)) {
 304                 spin_unlock_irqrestore(&mac->lock, lock_flags);
 305                 return -EINVAL;
 306         }
 307         mac->requested_channel = channel;
 308         spin_unlock_irqrestore(&mac->lock, lock_flags);
 309         if (netif_running(mac->netdev))
 310                 return zd_chip_set_channel(&mac->chip, channel);
 311         else
 312                 return 0;
 313 }
 314
 315 int zd_mac_get_channel(struct zd_mac *mac, u8 *channel, u8 *flags)
 316 {
 317         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 318
 319         *channel = zd_chip_get_channel(&mac->chip);
 320         if (ieee->iw_mode != IW_MODE_INFRA) {
 321                 spin_lock_irq(&mac->lock);
 322                 *flags = *channel == mac->requested_channel ?
 323                         MAC_FIXED_CHANNEL : 0;
 324                 spin_unlock(&mac->lock);
 325         } else {
 326                 *flags = 0;
 327         }
 328         dev_dbg_f(zd_mac_dev(mac), "channel %u flags %u\n", *channel, *flags);
 329         return 0;
 330 }
 331
 332 /* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */
 333 static u8 cs_typed_rate(u8 cs_rate)
 334 {
 335         static const u8 typed_rates[16] = {
 336                 [ZD_CS_CCK_RATE_1M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_1M,
 337                 [ZD_CS_CCK_RATE_2M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_2M,
 338                 [ZD_CS_CCK_RATE_5_5M]   = ZD_CS_CCK|ZD_CS_CCK_RATE_5_5M,
 339                 [ZD_CS_CCK_RATE_11M]    = ZD_CS_CCK|ZD_CS_CCK_RATE_11M,
 340                 [ZD_OFDM_RATE_6M]       = ZD_CS_OFDM|ZD_OFDM_RATE_6M,
 341                 [ZD_OFDM_RATE_9M]       = ZD_CS_OFDM|ZD_OFDM_RATE_9M,
 342                 [ZD_OFDM_RATE_12M]      = ZD_CS_OFDM|ZD_OFDM_RATE_12M,
 343                 [ZD_OFDM_RATE_18M]      = ZD_CS_OFDM|ZD_OFDM_RATE_18M,
 344                 [ZD_OFDM_RATE_24M]      = ZD_CS_OFDM|ZD_OFDM_RATE_24M,
 345                 [ZD_OFDM_RATE_36M]      = ZD_CS_OFDM|ZD_OFDM_RATE_36M,
 346                 [ZD_OFDM_RATE_48M]      = ZD_CS_OFDM|ZD_OFDM_RATE_48M,
 347                 [ZD_OFDM_RATE_54M]      = ZD_CS_OFDM|ZD_OFDM_RATE_54M,
 348         };
 349
 350         ZD_ASSERT(ZD_CS_RATE_MASK == 0x0f);
 351         return typed_rates[cs_rate & ZD_CS_RATE_MASK];
 352 }
 353
 354 /* Fallback to lowest rate, if rate is unknown. */
 355 static u8 rate_to_cs_rate(u8 rate)
 356 {
 357         switch (rate) {
 358         case IEEE80211_CCK_RATE_2MB:
 359                 return ZD_CS_CCK_RATE_2M;
 360         case IEEE80211_CCK_RATE_5MB:
 361                 return ZD_CS_CCK_RATE_5_5M;
 362         case IEEE80211_CCK_RATE_11MB:
 363                 return ZD_CS_CCK_RATE_11M;
 364         case IEEE80211_OFDM_RATE_6MB:
 365                 return ZD_OFDM_RATE_6M;
 366         case IEEE80211_OFDM_RATE_9MB:
 367                 return ZD_OFDM_RATE_9M;
 368         case IEEE80211_OFDM_RATE_12MB:
 369                 return ZD_OFDM_RATE_12M;
 370         case IEEE80211_OFDM_RATE_18MB:
 371                 return ZD_OFDM_RATE_18M;
 372         case IEEE80211_OFDM_RATE_24MB:
 373                 return ZD_OFDM_RATE_24M;
 374         case IEEE80211_OFDM_RATE_36MB:
 375                 return ZD_OFDM_RATE_36M;
 376         case IEEE80211_OFDM_RATE_48MB:
 377                 return ZD_OFDM_RATE_48M;
 378         case IEEE80211_OFDM_RATE_54MB:
 379                 return ZD_OFDM_RATE_54M;
 380         }
 381         return ZD_CS_CCK_RATE_1M;
 382 }
 383
 384 int zd_mac_set_mode(struct zd_mac *mac, u32 mode)
 385 {
 386         struct ieee80211_device *ieee;
 387
 388         switch (mode) {
 389         case IW_MODE_AUTO:
 390         case IW_MODE_ADHOC:
 391         case IW_MODE_INFRA:
 392                 mac->netdev->type = ARPHRD_ETHER;
 393                 break;
 394         case IW_MODE_MONITOR:
 395                 mac->netdev->type = ARPHRD_IEEE80211_RADIOTAP;
 396                 break;
 397         default:
 398                 dev_dbg_f(zd_mac_dev(mac), "wrong mode %u\n", mode);
 399                 return -EINVAL;
 400         }
 401
 402         ieee = zd_mac_to_ieee80211(mac);
 403         ZD_ASSERT(!irqs_disabled());
 404         spin_lock_irq(&ieee->lock);
 405         ieee->iw_mode = mode;
 406         spin_unlock_irq(&ieee->lock);
 407
 408         if (netif_running(mac->netdev))
 409                 return reset_mode(mac);
 410
 411         return 0;
 412 }
 413
 414 int zd_mac_get_mode(struct zd_mac *mac, u32 *mode)
 415 {
 416         unsigned long flags;
 417         struct ieee80211_device *ieee;
 418
 419         ieee = zd_mac_to_ieee80211(mac);
 420         spin_lock_irqsave(&ieee->lock, flags);
 421         *mode = ieee->iw_mode;
 422         spin_unlock_irqrestore(&ieee->lock, flags);
 423         return 0;
 424 }
 425
 426 int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range)
 427 {
 428         int i;
 429         const struct channel_range *channel_range;
 430         u8 regdomain;
 431
 432         memset(range, 0, sizeof(*range));
 433
 434         /* FIXME: Not so important and depends on the mode. For 802.11g
 435          * usually this value is used. It seems to be that Bit/s number is
 436          * given here.
 437          */
 438         range->throughput = 27 * 1000 * 1000;
 439
 440         range->max_qual.qual = 100;
 441         range->max_qual.level = 100;
 442
 443         /* FIXME: Needs still to be tuned. */
 444         range->avg_qual.qual = 71;
 445         range->avg_qual.level = 80;
 446
 447         /* FIXME: depends on standard? */
 448         range->min_rts = 256;
 449         range->max_rts = 2346;
 450
 451         range->min_frag = MIN_FRAG_THRESHOLD;
 452         range->max_frag = MAX_FRAG_THRESHOLD;
 453
 454         range->max_encoding_tokens = WEP_KEYS;
 455         range->num_encoding_sizes = 2;
 456         range->encoding_size[0] = 5;
 457         range->encoding_size[1] = WEP_KEY_LEN;
 458
 459         range->we_version_compiled = WIRELESS_EXT;
 460         range->we_version_source = 20;
 461
 462         ZD_ASSERT(!irqs_disabled());
 463         spin_lock_irq(&mac->lock);
 464         regdomain = mac->regdomain;
 465         spin_unlock_irq(&mac->lock);
 466         channel_range = zd_channel_range(regdomain);
 467
 468         range->num_channels = channel_range->end - channel_range->start;
 469         range->old_num_channels = range->num_channels;
 470         range->num_frequency = range->num_channels;
 471         range->old_num_frequency = range->num_frequency;
 472
 473         for (i = 0; i < range->num_frequency; i++) {
 474                 struct iw_freq *freq = &range->freq[i];
 475                 freq->i = channel_range->start + i;
 476                 zd_channel_to_freq(freq, freq->i);
 477         }
 478
 479         return 0;
 480 }
 481
 482 static int zd_calc_tx_length_us(u8 *service, u8 cs_rate, u16 tx_length)
 483 {
 484         static const u8 rate_divisor[] = {
 485                 [ZD_CS_CCK_RATE_1M]     =  1,
 486                 [ZD_CS_CCK_RATE_2M]     =  2,
 487                 [ZD_CS_CCK_RATE_5_5M]   = 11, /* bits must be doubled */
 488                 [ZD_CS_CCK_RATE_11M]    = 11,
 489                 [ZD_OFDM_RATE_6M]       =  6,
 490                 [ZD_OFDM_RATE_9M]       =  9,
 491                 [ZD_OFDM_RATE_12M]      = 12,
 492                 [ZD_OFDM_RATE_18M]      = 18,
 493                 [ZD_OFDM_RATE_24M]      = 24,
 494                 [ZD_OFDM_RATE_36M]      = 36,
 495                 [ZD_OFDM_RATE_48M]      = 48,
 496                 [ZD_OFDM_RATE_54M]      = 54,
 497         };
 498
 499         u32 bits = (u32)tx_length * 8;
 500         u32 divisor;
 501
 502         divisor = rate_divisor[cs_rate];
 503         if (divisor == 0)
 504                 return -EINVAL;
 505
 506         switch (cs_rate) {
 507         case ZD_CS_CCK_RATE_5_5M:
 508                 bits = (2*bits) + 10; /* round up to the next integer */
 509                 break;
 510         case ZD_CS_CCK_RATE_11M:
 511                 if (service) {
 512                         u32 t = bits % 11;
 513                         *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 514                         if (0 < t && t <= 3) {
 515                                 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 516                         }
 517                 }
 518                 bits += 10; /* round up to the next integer */
 519                 break;
 520         }
 521
 522         return bits/divisor;
 523 }
 524
 525 enum {
 526         R2M_SHORT_PREAMBLE = 0x01,
 527         R2M_11A            = 0x02,
 528 };
 529
 530 static u8 cs_rate_to_modulation(u8 cs_rate, int flags)
 531 {
 532         u8 modulation;
 533
 534         modulation = cs_typed_rate(cs_rate);
 535         if (flags & R2M_SHORT_PREAMBLE) {
 536                 switch (ZD_CS_RATE(modulation)) {
 537                 case ZD_CS_CCK_RATE_2M:
 538                 case ZD_CS_CCK_RATE_5_5M:
 539                 case ZD_CS_CCK_RATE_11M:
 540                         modulation |= ZD_CS_CCK_PREA_SHORT;
 541                         return modulation;
 542                 }
 543         }
 544         if (flags & R2M_11A) {
 545                 if (ZD_CS_TYPE(modulation) == ZD_CS_OFDM)
 546                         modulation |= ZD_CS_OFDM_MODE_11A;
 547         }
 548         return modulation;
 549 }
 550
 551 static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs,
 552                               struct ieee80211_hdr_4addr *hdr)
 553 {
 554         struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
 555         u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl));
 556         u8 rate, cs_rate;
 557         int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0;
 558
 559         /* FIXME: 802.11a? short preamble? */
 560         rate = ieee80211softmac_suggest_txrate(softmac,
 561                 is_multicast_ether_addr(hdr->addr1), is_mgt);
 562
 563         cs_rate = rate_to_cs_rate(rate);
 564         cs->modulation = cs_rate_to_modulation(cs_rate, 0);
 565 }
 566
 567 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 568                            struct ieee80211_hdr_4addr *header)
 569 {
 570         unsigned int tx_length = le16_to_cpu(cs->tx_length);
 571         u16 fctl = le16_to_cpu(header->frame_ctl);
 572         u16 ftype = WLAN_FC_GET_TYPE(fctl);
 573         u16 stype = WLAN_FC_GET_STYPE(fctl);
 574
 575         /*
 576          * CONTROL:
 577          * - start at 0x00
 578          * - if fragment 0, enable bit 0
 579          * - if backoff needed, enable bit 0
 580          * - if burst (backoff not needed) disable bit 0
 581          * - if multicast, enable bit 1
 582          * - if PS-POLL frame, enable bit 2
 583          * - if in INDEPENDENT_BSS mode and zd1205_DestPowerSave, then enable
 584          *   bit 4 (FIXME: wtf)
 585          * - if frag_len > RTS threshold, set bit 5 as long if it isnt
 586          *   multicast or mgt
 587          * - if bit 5 is set, and we are in OFDM mode, unset bit 5 and set bit
 588          *   7
 589          */
 590
 591         cs->control = 0;
 592
 593         /* First fragment */
 594         if (WLAN_GET_SEQ_FRAG(le16_to_cpu(header->seq_ctl)) == 0)
 595                 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 596
 597         /* Multicast */
 598         if (is_multicast_ether_addr(header->addr1))
 599                 cs->control |= ZD_CS_MULTICAST;
 600
 601         /* PS-POLL */
 602         if (stype == IEEE80211_STYPE_PSPOLL)
 603                 cs->control |= ZD_CS_PS_POLL_FRAME;
 604
 605         if (!is_multicast_ether_addr(header->addr1) &&
 606             ftype != IEEE80211_FTYPE_MGMT &&
 607             tx_length > zd_netdev_ieee80211(mac->netdev)->rts)
 608         {
 609                 /* FIXME: check the logic */
 610                 if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM) {
 611                         /* 802.11g */
 612                         cs->control |= ZD_CS_SELF_CTS;
 613                 } else { /* 802.11b */
 614                         cs->control |= ZD_CS_RTS;
 615                 }
 616         }
 617
 618         /* FIXME: Management frame? */
 619 }
 620
 621 static int fill_ctrlset(struct zd_mac *mac,
 622                         struct ieee80211_txb *txb,
 623                         int frag_num)
 624 {
 625         int r;
 626         struct sk_buff *skb = txb->fragments[frag_num];
 627         struct ieee80211_hdr_4addr *hdr =
 628                 (struct ieee80211_hdr_4addr *) skb->data;
 629         unsigned int frag_len = skb->len + IEEE80211_FCS_LEN;
 630         unsigned int next_frag_len;
 631         unsigned int packet_length;
 632         struct zd_ctrlset *cs = (struct zd_ctrlset *)
 633                 skb_push(skb, sizeof(struct zd_ctrlset));
 634
 635         if (frag_num+1  < txb->nr_frags) {
 636                 next_frag_len = txb->fragments[frag_num+1]->len +
 637                                 IEEE80211_FCS_LEN;
 638         } else {
 639                 next_frag_len = 0;
 640         }
 641         ZD_ASSERT(frag_len <= 0xffff);
 642         ZD_ASSERT(next_frag_len <= 0xffff);
 643
 644         cs_set_modulation(mac, cs, hdr);
 645
 646         cs->tx_length = cpu_to_le16(frag_len);
 647
 648         cs_set_control(mac, cs, hdr);
 649
 650         packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
 651         ZD_ASSERT(packet_length <= 0xffff);
 652         /* ZD1211B: Computing the length difference this way, gives us
 653          * flexibility to compute the packet length.
 654          */
 655         cs->packet_length = cpu_to_le16(mac->chip.is_zd1211b ?
 656                         packet_length - frag_len : packet_length);
 657
 658         /*
 659          * CURRENT LENGTH:
 660          * - transmit frame length in microseconds
 661          * - seems to be derived from frame length
 662          * - see Cal_Us_Service() in zdinlinef.h
 663          * - if macp->bTxBurstEnable is enabled, then multiply by 4
 664          *  - bTxBurstEnable is never set in the vendor driver
 665          *
 666          * SERVICE:
 667          * - "for PLCP configuration"
 668          * - always 0 except in some situations at 802.11b 11M
 669          * - see line 53 of zdinlinef.h
 670          */
 671         cs->service = 0;
 672         r = zd_calc_tx_length_us(&cs->service, ZD_CS_RATE(cs->modulation),
 673                                  le16_to_cpu(cs->tx_length));
 674         if (r < 0)
 675                 return r;
 676         cs->current_length = cpu_to_le16(r);
 677
 678         if (next_frag_len == 0) {
 679                 cs->next_frame_length = 0;
 680         } else {
 681                 r = zd_calc_tx_length_us(NULL, ZD_CS_RATE(cs->modulation),
 682                                          next_frag_len);
 683                 if (r < 0)
 684                         return r;
 685                 cs->next_frame_length = cpu_to_le16(r);
 686         }
 687
 688         return 0;
 689 }
 690
 691 static int zd_mac_tx(struct zd_mac *mac, struct ieee80211_txb *txb, int pri)
 692 {
 693         int i, r;
 694
 695         for (i = 0; i < txb->nr_frags; i++) {
 696                 struct sk_buff *skb = txb->fragments[i];
 697
 698                 r = fill_ctrlset(mac, txb, i);
 699                 if (r)
 700                         return r;
 701                 r = zd_usb_tx(&mac->chip.usb, skb->data, skb->len);
 702                 if (r)
 703                         return r;
 704         }
 705
 706         /* FIXME: shouldn't this be handled by the upper layers? */
 707         mac->netdev->trans_start = jiffies;
 708
 709         ieee80211_txb_free(txb);
 710         return 0;
 711 }
 712
 713 struct zd_rt_hdr {
 714         struct ieee80211_radiotap_header rt_hdr;
 715         u8  rt_flags;
 716         u16 rt_channel;
 717         u16 rt_chbitmask;
 718         u16 rt_rate;
 719 };
 720
 721 static void fill_rt_header(void *buffer, struct zd_mac *mac,
 722                            const struct ieee80211_rx_stats *stats,
 723                            const struct rx_status *status)
 724 {
 725         struct zd_rt_hdr *hdr = buffer;
 726
 727         hdr->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 728         hdr->rt_hdr.it_pad = 0;
 729         hdr->rt_hdr.it_len = cpu_to_le16(sizeof(struct zd_rt_hdr));
 730         hdr->rt_hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 731                                  (1 << IEEE80211_RADIOTAP_CHANNEL) |
 732                                  (1 << IEEE80211_RADIOTAP_RATE));
 733
 734         hdr->rt_flags = 0;
 735         if (status->decryption_type & (ZD_RX_WEP64|ZD_RX_WEP128|ZD_RX_WEP256))
 736                 hdr->rt_flags |= IEEE80211_RADIOTAP_F_WEP;
 737
 738         /* FIXME: 802.11a */
 739         hdr->rt_channel = cpu_to_le16(ieee80211chan2mhz(
 740                                              _zd_chip_get_channel(&mac->chip)));
 741         hdr->rt_chbitmask = cpu_to_le16(IEEE80211_CHAN_2GHZ |
 742                 ((status->frame_status & ZD_RX_FRAME_MODULATION_MASK) ==
 743                 ZD_RX_OFDM ? IEEE80211_CHAN_OFDM : IEEE80211_CHAN_CCK));
 744
 745         hdr->rt_rate = stats->rate / 5;
 746 }
 747
 748 /* Returns 1 if the data packet is for us and 0 otherwise. */
 749 static int is_data_packet_for_us(struct ieee80211_device *ieee,
 750                                  struct ieee80211_hdr_4addr *hdr)
 751 {
 752         struct net_device *netdev = ieee->dev;
 753         u16 fc = le16_to_cpu(hdr->frame_ctl);
 754
 755         ZD_ASSERT(WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA);
 756
 757         switch (ieee->iw_mode) {
 758         case IW_MODE_ADHOC:
 759                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) != 0 ||
 760                     memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) != 0)
 761                         return 0;
 762                 break;
 763         case IW_MODE_AUTO:
 764         case IW_MODE_INFRA:
 765                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) !=
 766                     IEEE80211_FCTL_FROMDS ||
 767                     memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) != 0)
 768                         return 0;
 769                 break;
 770         default:
 771                 ZD_ASSERT(ieee->iw_mode != IW_MODE_MONITOR);
 772                 return 0;
 773         }
 774
 775         return memcmp(hdr->addr1, netdev->dev_addr, ETH_ALEN) == 0 ||
 776                is_multicast_ether_addr(hdr->addr1) ||
 777                (netdev->flags & IFF_PROMISC);
 778 }
 779
 780 /* Filters receiving packets. If it returns 1 send it to ieee80211_rx, if 0
 781  * return. If an error is detected -EINVAL is returned. ieee80211_rx_mgt() is
 782  * called here.
 783  *
 784  * It has been based on ieee80211_rx_any.
 785  */
 786 static int filter_rx(struct ieee80211_device *ieee,
 787                      const u8 *buffer, unsigned int length,
 788                      struct ieee80211_rx_stats *stats)
 789 {
 790         struct ieee80211_hdr_4addr *hdr;
 791         u16 fc;
 792
 793         if (ieee->iw_mode == IW_MODE_MONITOR)
 794                 return 1;
 795
 796         hdr = (struct ieee80211_hdr_4addr *)buffer;
 797         fc = le16_to_cpu(hdr->frame_ctl);
 798         if ((fc & IEEE80211_FCTL_VERS) != 0)
 799                 return -EINVAL;
 800
 801         switch (WLAN_FC_GET_TYPE(fc)) {
 802         case IEEE80211_FTYPE_MGMT:
 803                 if (length < sizeof(struct ieee80211_hdr_3addr))
 804                         return -EINVAL;
 805                 ieee80211_rx_mgt(ieee, hdr, stats);
 806                 return 0;
 807         case IEEE80211_FTYPE_CTL:
 808                 /* Ignore invalid short buffers */
 809                 return 0;
 810         case IEEE80211_FTYPE_DATA:
 811                 if (length < sizeof(struct ieee80211_hdr_3addr))
 812                         return -EINVAL;
 813                 return is_data_packet_for_us(ieee, hdr);
 814         }
 815
 816         return -EINVAL;
 817 }
 818
 819 static void update_qual_rssi(struct zd_mac *mac, u8 qual_percent, u8 rssi)
 820 {
 821         unsigned long flags;
 822
 823         spin_lock_irqsave(&mac->lock, flags);
 824         mac->qual_average = (7 * mac->qual_average + qual_percent) / 8;
 825         mac->rssi_average = (7 * mac->rssi_average + rssi) / 8;
 826         spin_unlock_irqrestore(&mac->lock, flags);
 827 }
 828
 829 static int fill_rx_stats(struct ieee80211_rx_stats *stats,
 830                          const struct rx_status **pstatus,
 831                          struct zd_mac *mac,
 832                          const u8 *buffer, unsigned int length)
 833 {
 834         const struct rx_status *status;
 835
 836         *pstatus = status = zd_tail(buffer, length, sizeof(struct rx_status));
 837         if (status->frame_status & ZD_RX_ERROR) {
 838                 /* FIXME: update? */
 839                 return -EINVAL;
 840         }
 841         memset(stats, 0, sizeof(struct ieee80211_rx_stats));
 842         stats->len = length - (ZD_PLCP_HEADER_SIZE + IEEE80211_FCS_LEN +
 843                                + sizeof(struct rx_status));
 844         /* FIXME: 802.11a */
 845         stats->freq = IEEE80211_24GHZ_BAND;
 846         stats->received_channel = _zd_chip_get_channel(&mac->chip);
 847         stats->rssi = zd_rx_strength_percent(status->signal_strength);
 848         stats->signal = zd_rx_qual_percent(buffer,
 849                                           length - sizeof(struct rx_status),
 850                                           status);
 851         stats->mask = IEEE80211_STATMASK_RSSI | IEEE80211_STATMASK_SIGNAL;
 852         stats->rate = zd_rx_rate(buffer, status);
 853         if (stats->rate)
 854                 stats->mask |= IEEE80211_STATMASK_RATE;
 855
 856         update_qual_rssi(mac, stats->signal, stats->rssi);
 857         return 0;
 858 }
 859
 860 int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
 861 {
 862         int r;
 863         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 864         struct ieee80211_rx_stats stats;
 865         const struct rx_status *status;
 866         struct sk_buff *skb;
 867
 868         if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
 869                      IEEE80211_FCS_LEN + sizeof(struct rx_status))
 870                 return -EINVAL;
 871
 872         r = fill_rx_stats(&stats, &status, mac, buffer, length);
 873         if (r)
 874                 return r;
 875
 876         length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
 877                   sizeof(struct rx_status);
 878         buffer += ZD_PLCP_HEADER_SIZE;
 879
 880         r = filter_rx(ieee, buffer, length, &stats);
 881         if (r <= 0)
 882                 return r;
 883
 884         skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
 885         if (!skb)
 886                 return -ENOMEM;
 887         if (ieee->iw_mode == IW_MODE_MONITOR)
 888                 fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
 889                                &stats, status);
 890         memcpy(skb_put(skb, length), buffer, length);
 891
 892         r = ieee80211_rx(ieee, skb, &stats);
 893         if (!r) {
 894                 ZD_ASSERT(in_irq());
 895                 dev_kfree_skb_irq(skb);
 896         }
 897         return 0;
 898 }
 899
 900 static int netdev_tx(struct ieee80211_txb *txb, struct net_device *netdev,
 901                      int pri)
 902 {
 903         return zd_mac_tx(zd_netdev_mac(netdev), txb, pri);
 904 }
 905
 906 static void set_security(struct net_device *netdev,
 907                          struct ieee80211_security *sec)
 908 {
 909         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
 910         struct ieee80211_security *secinfo = &ieee->sec;
 911         int keyidx;
 912
 913         dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)), "\n");
 914
 915         for (keyidx = 0; keyidx<WEP_KEYS; keyidx++)
 916                 if (sec->flags & (1<<keyidx)) {
 917                         secinfo->encode_alg[keyidx] = sec->encode_alg[keyidx];
 918                         secinfo->key_sizes[keyidx] = sec->key_sizes[keyidx];
 919                         memcpy(secinfo->keys[keyidx], sec->keys[keyidx],
 920                                SCM_KEY_LEN);
 921                 }
 922
 923         if (sec->flags & SEC_ACTIVE_KEY) {
 924                 secinfo->active_key = sec->active_key;
 925                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 926                         "   .active_key = %d\n", sec->active_key);
 927         }
 928         if (sec->flags & SEC_UNICAST_GROUP) {
 929                 secinfo->unicast_uses_group = sec->unicast_uses_group;
 930                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 931                         "   .unicast_uses_group = %d\n",
 932                         sec->unicast_uses_group);
 933         }
 934         if (sec->flags & SEC_LEVEL) {
 935                 secinfo->level = sec->level;
 936                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 937                         "   .level = %d\n", sec->level);
 938         }
 939         if (sec->flags & SEC_ENABLED) {
 940                 secinfo->enabled = sec->enabled;
 941                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 942                         "   .enabled = %d\n", sec->enabled);
 943         }
 944         if (sec->flags & SEC_ENCRYPT) {
 945                 secinfo->encrypt = sec->encrypt;
 946                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 947                         "   .encrypt = %d\n", sec->encrypt);
 948         }
 949         if (sec->flags & SEC_AUTH_MODE) {
 950                 secinfo->auth_mode = sec->auth_mode;
 951                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 952                         "   .auth_mode = %d\n", sec->auth_mode);
 953         }
 954 }
 955
 956 static void ieee_init(struct ieee80211_device *ieee)
 957 {
 958         ieee->mode = IEEE_B | IEEE_G;
 959         ieee->freq_band = IEEE80211_24GHZ_BAND;
 960         ieee->modulation = IEEE80211_OFDM_MODULATION | IEEE80211_CCK_MODULATION;
 961         ieee->tx_headroom = sizeof(struct zd_ctrlset);
 962         ieee->set_security = set_security;
 963         ieee->hard_start_xmit = netdev_tx;
 964
 965         /* Software encryption/decryption for now */
 966         ieee->host_build_iv = 0;
 967         ieee->host_encrypt = 1;
 968         ieee->host_decrypt = 1;
 969
 970         /* FIXME: default to managed mode, until ieee80211 and zd1211rw can
 971          * correctly support AUTO */
 972         ieee->iw_mode = IW_MODE_INFRA;
 973 }
 974
 975 static void softmac_init(struct ieee80211softmac_device *sm)
 976 {
 977         sm->set_channel = set_channel;
 978 }
 979
 980 struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
 981 {
 982         struct zd_mac *mac = zd_netdev_mac(ndev);
 983         struct iw_statistics *iw_stats = &mac->iw_stats;
 984
 985         memset(iw_stats, 0, sizeof(struct iw_statistics));
 986         /* We are not setting the status, because ieee->state is not updated
 987          * at all and this driver doesn't track authentication state.
 988          */
 989         spin_lock_irq(&mac->lock);
 990         iw_stats->qual.qual = mac->qual_average;
 991         iw_stats->qual.level = mac->rssi_average;
 992         iw_stats->qual.updated = IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED|
 993                                  IW_QUAL_NOISE_INVALID;
 994         spin_unlock_irq(&mac->lock);
 995         /* TODO: update counter */
 996         return iw_stats;
 997 }
 998
 999 #ifdef DEBUG
1000 static const char* decryption_types[] = {
1001         [ZD_RX_NO_WEP] = "none",
1002         [ZD_RX_WEP64] = "WEP64",
1003         [ZD_RX_TKIP] = "TKIP",
1004         [ZD_RX_AES] = "AES",
1005         [ZD_RX_WEP128] = "WEP128",
1006         [ZD_RX_WEP256] = "WEP256",
1007 };
1008
1009 static const char *decryption_type_string(u8 type)
1010 {
1011         const char *s;
1012
1013         if (type < ARRAY_SIZE(decryption_types)) {
1014                 s = decryption_types[type];
1015         } else {
1016                 s = NULL;
1017         }
1018         return s ? s : "unknown";
1019 }
1020
1021 static int is_ofdm(u8 frame_status)
1022 {
1023         return (frame_status & ZD_RX_OFDM);
1024 }
1025
1026 void zd_dump_rx_status(const struct rx_status *status)
1027 {
1028         const char* modulation;
1029         u8 quality;
1030
1031         if (is_ofdm(status->frame_status)) {
1032                 modulation = "ofdm";
1033                 quality = status->signal_quality_ofdm;
1034         } else {
1035                 modulation = "cck";
1036                 quality = status->signal_quality_cck;
1037         }
1038         pr_debug("rx status %s strength %#04x qual %#04x decryption %s\n",
1039                 modulation, status->signal_strength, quality,
1040                 decryption_type_string(status->decryption_type));
1041         if (status->frame_status & ZD_RX_ERROR) {
1042                 pr_debug("rx error %s%s%s%s%s%s\n",
1043                         (status->frame_status & ZD_RX_TIMEOUT_ERROR) ?
1044                                 "timeout " : "",
1045                         (status->frame_status & ZD_RX_FIFO_OVERRUN_ERROR) ?
1046                                 "fifo " : "",
1047                         (status->frame_status & ZD_RX_DECRYPTION_ERROR) ?
1048                                 "decryption " : "",
1049                         (status->frame_status & ZD_RX_CRC32_ERROR) ?
1050                                 "crc32 " : "",
1051                         (status->frame_status & ZD_RX_NO_ADDR1_MATCH_ERROR) ?
1052                                 "addr1 " : "",
1053                         (status->frame_status & ZD_RX_CRC16_ERROR) ?
1054                                 "crc16" : "");
1055         }
1056 }
1057 #endif /* DEBUG */