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 int zd_mac_request_channel(struct zd_mac *mac, u8 channel)
 299 {
 300         unsigned long lock_flags;
 301         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 302
 303         if (ieee->iw_mode == IW_MODE_INFRA)
 304                 return -EPERM;
 305
 306         spin_lock_irqsave(&mac->lock, lock_flags);
 307         if (!zd_regdomain_supports_channel(mac->regdomain, channel)) {
 308                 spin_unlock_irqrestore(&mac->lock, lock_flags);
 309                 return -EINVAL;
 310         }
 311         mac->requested_channel = channel;
 312         spin_unlock_irqrestore(&mac->lock, lock_flags);
 313         if (netif_running(mac->netdev))
 314                 return zd_chip_set_channel(&mac->chip, channel);
 315         else
 316                 return 0;
 317 }
 318
 319 u8 zd_mac_get_channel(struct zd_mac *mac)
 320 {
 321         u8 channel = zd_chip_get_channel(&mac->chip);
 322
 323         dev_dbg_f(zd_mac_dev(mac), "channel %u\n", channel);
 324         return channel;
 325 }
 326
 327 /* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */
 328 static u8 cs_typed_rate(u8 cs_rate)
 329 {
 330         static const u8 typed_rates[16] = {
 331                 [ZD_CS_CCK_RATE_1M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_1M,
 332                 [ZD_CS_CCK_RATE_2M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_2M,
 333                 [ZD_CS_CCK_RATE_5_5M]   = ZD_CS_CCK|ZD_CS_CCK_RATE_5_5M,
 334                 [ZD_CS_CCK_RATE_11M]    = ZD_CS_CCK|ZD_CS_CCK_RATE_11M,
 335                 [ZD_OFDM_RATE_6M]       = ZD_CS_OFDM|ZD_OFDM_RATE_6M,
 336                 [ZD_OFDM_RATE_9M]       = ZD_CS_OFDM|ZD_OFDM_RATE_9M,
 337                 [ZD_OFDM_RATE_12M]      = ZD_CS_OFDM|ZD_OFDM_RATE_12M,
 338                 [ZD_OFDM_RATE_18M]      = ZD_CS_OFDM|ZD_OFDM_RATE_18M,
 339                 [ZD_OFDM_RATE_24M]      = ZD_CS_OFDM|ZD_OFDM_RATE_24M,
 340                 [ZD_OFDM_RATE_36M]      = ZD_CS_OFDM|ZD_OFDM_RATE_36M,
 341                 [ZD_OFDM_RATE_48M]      = ZD_CS_OFDM|ZD_OFDM_RATE_48M,
 342                 [ZD_OFDM_RATE_54M]      = ZD_CS_OFDM|ZD_OFDM_RATE_54M,
 343         };
 344
 345         ZD_ASSERT(ZD_CS_RATE_MASK == 0x0f);
 346         return typed_rates[cs_rate & ZD_CS_RATE_MASK];
 347 }
 348
 349 /* Fallback to lowest rate, if rate is unknown. */
 350 static u8 rate_to_cs_rate(u8 rate)
 351 {
 352         switch (rate) {
 353         case IEEE80211_CCK_RATE_2MB:
 354                 return ZD_CS_CCK_RATE_2M;
 355         case IEEE80211_CCK_RATE_5MB:
 356                 return ZD_CS_CCK_RATE_5_5M;
 357         case IEEE80211_CCK_RATE_11MB:
 358                 return ZD_CS_CCK_RATE_11M;
 359         case IEEE80211_OFDM_RATE_6MB:
 360                 return ZD_OFDM_RATE_6M;
 361         case IEEE80211_OFDM_RATE_9MB:
 362                 return ZD_OFDM_RATE_9M;
 363         case IEEE80211_OFDM_RATE_12MB:
 364                 return ZD_OFDM_RATE_12M;
 365         case IEEE80211_OFDM_RATE_18MB:
 366                 return ZD_OFDM_RATE_18M;
 367         case IEEE80211_OFDM_RATE_24MB:
 368                 return ZD_OFDM_RATE_24M;
 369         case IEEE80211_OFDM_RATE_36MB:
 370                 return ZD_OFDM_RATE_36M;
 371         case IEEE80211_OFDM_RATE_48MB:
 372                 return ZD_OFDM_RATE_48M;
 373         case IEEE80211_OFDM_RATE_54MB:
 374                 return ZD_OFDM_RATE_54M;
 375         }
 376         return ZD_CS_CCK_RATE_1M;
 377 }
 378
 379 int zd_mac_set_mode(struct zd_mac *mac, u32 mode)
 380 {
 381         struct ieee80211_device *ieee;
 382
 383         switch (mode) {
 384         case IW_MODE_AUTO:
 385         case IW_MODE_ADHOC:
 386         case IW_MODE_INFRA:
 387                 mac->netdev->type = ARPHRD_ETHER;
 388                 break;
 389         case IW_MODE_MONITOR:
 390                 mac->netdev->type = ARPHRD_IEEE80211_RADIOTAP;
 391                 break;
 392         default:
 393                 dev_dbg_f(zd_mac_dev(mac), "wrong mode %u\n", mode);
 394                 return -EINVAL;
 395         }
 396
 397         ieee = zd_mac_to_ieee80211(mac);
 398         ZD_ASSERT(!irqs_disabled());
 399         spin_lock_irq(&ieee->lock);
 400         ieee->iw_mode = mode;
 401         spin_unlock_irq(&ieee->lock);
 402
 403         if (netif_running(mac->netdev))
 404                 return reset_mode(mac);
 405
 406         return 0;
 407 }
 408
 409 int zd_mac_get_mode(struct zd_mac *mac, u32 *mode)
 410 {
 411         unsigned long flags;
 412         struct ieee80211_device *ieee;
 413
 414         ieee = zd_mac_to_ieee80211(mac);
 415         spin_lock_irqsave(&ieee->lock, flags);
 416         *mode = ieee->iw_mode;
 417         spin_unlock_irqrestore(&ieee->lock, flags);
 418         return 0;
 419 }
 420
 421 int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range)
 422 {
 423         int i;
 424         const struct channel_range *channel_range;
 425         u8 regdomain;
 426
 427         memset(range, 0, sizeof(*range));
 428
 429         /* FIXME: Not so important and depends on the mode. For 802.11g
 430          * usually this value is used. It seems to be that Bit/s number is
 431          * given here.
 432          */
 433         range->throughput = 27 * 1000 * 1000;
 434
 435         range->max_qual.qual = 100;
 436         range->max_qual.level = 100;
 437
 438         /* FIXME: Needs still to be tuned. */
 439         range->avg_qual.qual = 71;
 440         range->avg_qual.level = 80;
 441
 442         /* FIXME: depends on standard? */
 443         range->min_rts = 256;
 444         range->max_rts = 2346;
 445
 446         range->min_frag = MIN_FRAG_THRESHOLD;
 447         range->max_frag = MAX_FRAG_THRESHOLD;
 448
 449         range->max_encoding_tokens = WEP_KEYS;
 450         range->num_encoding_sizes = 2;
 451         range->encoding_size[0] = 5;
 452         range->encoding_size[1] = WEP_KEY_LEN;
 453
 454         range->we_version_compiled = WIRELESS_EXT;
 455         range->we_version_source = 20;
 456
 457         ZD_ASSERT(!irqs_disabled());
 458         spin_lock_irq(&mac->lock);
 459         regdomain = mac->regdomain;
 460         spin_unlock_irq(&mac->lock);
 461         channel_range = zd_channel_range(regdomain);
 462
 463         range->num_channels = channel_range->end - channel_range->start;
 464         range->old_num_channels = range->num_channels;
 465         range->num_frequency = range->num_channels;
 466         range->old_num_frequency = range->num_frequency;
 467
 468         for (i = 0; i < range->num_frequency; i++) {
 469                 struct iw_freq *freq = &range->freq[i];
 470                 freq->i = channel_range->start + i;
 471                 zd_channel_to_freq(freq, freq->i);
 472         }
 473
 474         return 0;
 475 }
 476
 477 static int zd_calc_tx_length_us(u8 *service, u8 cs_rate, u16 tx_length)
 478 {
 479         static const u8 rate_divisor[] = {
 480                 [ZD_CS_CCK_RATE_1M]     =  1,
 481                 [ZD_CS_CCK_RATE_2M]     =  2,
 482                 [ZD_CS_CCK_RATE_5_5M]   = 11, /* bits must be doubled */
 483                 [ZD_CS_CCK_RATE_11M]    = 11,
 484                 [ZD_OFDM_RATE_6M]       =  6,
 485                 [ZD_OFDM_RATE_9M]       =  9,
 486                 [ZD_OFDM_RATE_12M]      = 12,
 487                 [ZD_OFDM_RATE_18M]      = 18,
 488                 [ZD_OFDM_RATE_24M]      = 24,
 489                 [ZD_OFDM_RATE_36M]      = 36,
 490                 [ZD_OFDM_RATE_48M]      = 48,
 491                 [ZD_OFDM_RATE_54M]      = 54,
 492         };
 493
 494         u32 bits = (u32)tx_length * 8;
 495         u32 divisor;
 496
 497         divisor = rate_divisor[cs_rate];
 498         if (divisor == 0)
 499                 return -EINVAL;
 500
 501         switch (cs_rate) {
 502         case ZD_CS_CCK_RATE_5_5M:
 503                 bits = (2*bits) + 10; /* round up to the next integer */
 504                 break;
 505         case ZD_CS_CCK_RATE_11M:
 506                 if (service) {
 507                         u32 t = bits % 11;
 508                         *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 509                         if (0 < t && t <= 3) {
 510                                 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 511                         }
 512                 }
 513                 bits += 10; /* round up to the next integer */
 514                 break;
 515         }
 516
 517         return bits/divisor;
 518 }
 519
 520 enum {
 521         R2M_SHORT_PREAMBLE = 0x01,
 522         R2M_11A            = 0x02,
 523 };
 524
 525 static u8 cs_rate_to_modulation(u8 cs_rate, int flags)
 526 {
 527         u8 modulation;
 528
 529         modulation = cs_typed_rate(cs_rate);
 530         if (flags & R2M_SHORT_PREAMBLE) {
 531                 switch (ZD_CS_RATE(modulation)) {
 532                 case ZD_CS_CCK_RATE_2M:
 533                 case ZD_CS_CCK_RATE_5_5M:
 534                 case ZD_CS_CCK_RATE_11M:
 535                         modulation |= ZD_CS_CCK_PREA_SHORT;
 536                         return modulation;
 537                 }
 538         }
 539         if (flags & R2M_11A) {
 540                 if (ZD_CS_TYPE(modulation) == ZD_CS_OFDM)
 541                         modulation |= ZD_CS_OFDM_MODE_11A;
 542         }
 543         return modulation;
 544 }
 545
 546 static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs,
 547                               struct ieee80211_hdr_4addr *hdr)
 548 {
 549         struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
 550         u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl));
 551         u8 rate, cs_rate;
 552         int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0;
 553
 554         /* FIXME: 802.11a? short preamble? */
 555         rate = ieee80211softmac_suggest_txrate(softmac,
 556                 is_multicast_ether_addr(hdr->addr1), is_mgt);
 557
 558         cs_rate = rate_to_cs_rate(rate);
 559         cs->modulation = cs_rate_to_modulation(cs_rate, 0);
 560 }
 561
 562 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 563                            struct ieee80211_hdr_4addr *header)
 564 {
 565         unsigned int tx_length = le16_to_cpu(cs->tx_length);
 566         u16 fctl = le16_to_cpu(header->frame_ctl);
 567         u16 ftype = WLAN_FC_GET_TYPE(fctl);
 568         u16 stype = WLAN_FC_GET_STYPE(fctl);
 569
 570         /*
 571          * CONTROL:
 572          * - start at 0x00
 573          * - if fragment 0, enable bit 0
 574          * - if backoff needed, enable bit 0
 575          * - if burst (backoff not needed) disable bit 0
 576          * - if multicast, enable bit 1
 577          * - if PS-POLL frame, enable bit 2
 578          * - if in INDEPENDENT_BSS mode and zd1205_DestPowerSave, then enable
 579          *   bit 4 (FIXME: wtf)
 580          * - if frag_len > RTS threshold, set bit 5 as long if it isnt
 581          *   multicast or mgt
 582          * - if bit 5 is set, and we are in OFDM mode, unset bit 5 and set bit
 583          *   7
 584          */
 585
 586         cs->control = 0;
 587
 588         /* First fragment */
 589         if (WLAN_GET_SEQ_FRAG(le16_to_cpu(header->seq_ctl)) == 0)
 590                 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 591
 592         /* Multicast */
 593         if (is_multicast_ether_addr(header->addr1))
 594                 cs->control |= ZD_CS_MULTICAST;
 595
 596         /* PS-POLL */
 597         if (stype == IEEE80211_STYPE_PSPOLL)
 598                 cs->control |= ZD_CS_PS_POLL_FRAME;
 599
 600         if (!is_multicast_ether_addr(header->addr1) &&
 601             ftype != IEEE80211_FTYPE_MGMT &&
 602             tx_length > zd_netdev_ieee80211(mac->netdev)->rts)
 603         {
 604                 /* FIXME: check the logic */
 605                 if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM) {
 606                         /* 802.11g */
 607                         cs->control |= ZD_CS_SELF_CTS;
 608                 } else { /* 802.11b */
 609                         cs->control |= ZD_CS_RTS;
 610                 }
 611         }
 612
 613         /* FIXME: Management frame? */
 614 }
 615
 616 static int fill_ctrlset(struct zd_mac *mac,
 617                         struct ieee80211_txb *txb,
 618                         int frag_num)
 619 {
 620         int r;
 621         struct sk_buff *skb = txb->fragments[frag_num];
 622         struct ieee80211_hdr_4addr *hdr =
 623                 (struct ieee80211_hdr_4addr *) skb->data;
 624         unsigned int frag_len = skb->len + IEEE80211_FCS_LEN;
 625         unsigned int next_frag_len;
 626         unsigned int packet_length;
 627         struct zd_ctrlset *cs = (struct zd_ctrlset *)
 628                 skb_push(skb, sizeof(struct zd_ctrlset));
 629
 630         if (frag_num+1  < txb->nr_frags) {
 631                 next_frag_len = txb->fragments[frag_num+1]->len +
 632                                 IEEE80211_FCS_LEN;
 633         } else {
 634                 next_frag_len = 0;
 635         }
 636         ZD_ASSERT(frag_len <= 0xffff);
 637         ZD_ASSERT(next_frag_len <= 0xffff);
 638
 639         cs_set_modulation(mac, cs, hdr);
 640
 641         cs->tx_length = cpu_to_le16(frag_len);
 642
 643         cs_set_control(mac, cs, hdr);
 644
 645         packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
 646         ZD_ASSERT(packet_length <= 0xffff);
 647         /* ZD1211B: Computing the length difference this way, gives us
 648          * flexibility to compute the packet length.
 649          */
 650         cs->packet_length = cpu_to_le16(mac->chip.is_zd1211b ?
 651                         packet_length - frag_len : packet_length);
 652
 653         /*
 654          * CURRENT LENGTH:
 655          * - transmit frame length in microseconds
 656          * - seems to be derived from frame length
 657          * - see Cal_Us_Service() in zdinlinef.h
 658          * - if macp->bTxBurstEnable is enabled, then multiply by 4
 659          *  - bTxBurstEnable is never set in the vendor driver
 660          *
 661          * SERVICE:
 662          * - "for PLCP configuration"
 663          * - always 0 except in some situations at 802.11b 11M
 664          * - see line 53 of zdinlinef.h
 665          */
 666         cs->service = 0;
 667         r = zd_calc_tx_length_us(&cs->service, ZD_CS_RATE(cs->modulation),
 668                                  le16_to_cpu(cs->tx_length));
 669         if (r < 0)
 670                 return r;
 671         cs->current_length = cpu_to_le16(r);
 672
 673         if (next_frag_len == 0) {
 674                 cs->next_frame_length = 0;
 675         } else {
 676                 r = zd_calc_tx_length_us(NULL, ZD_CS_RATE(cs->modulation),
 677                                          next_frag_len);
 678                 if (r < 0)
 679                         return r;
 680                 cs->next_frame_length = cpu_to_le16(r);
 681         }
 682
 683         return 0;
 684 }
 685
 686 static int zd_mac_tx(struct zd_mac *mac, struct ieee80211_txb *txb, int pri)
 687 {
 688         int i, r;
 689
 690         for (i = 0; i < txb->nr_frags; i++) {
 691                 struct sk_buff *skb = txb->fragments[i];
 692
 693                 r = fill_ctrlset(mac, txb, i);
 694                 if (r)
 695                         return r;
 696                 r = zd_usb_tx(&mac->chip.usb, skb->data, skb->len);
 697                 if (r)
 698                         return r;
 699         }
 700
 701         /* FIXME: shouldn't this be handled by the upper layers? */
 702         mac->netdev->trans_start = jiffies;
 703
 704         ieee80211_txb_free(txb);
 705         return 0;
 706 }
 707
 708 struct zd_rt_hdr {
 709         struct ieee80211_radiotap_header rt_hdr;
 710         u8  rt_flags;
 711         u8  rt_rate;
 712         u16 rt_channel;
 713         u16 rt_chbitmask;
 714 } __attribute__((packed));
 715
 716 static void fill_rt_header(void *buffer, struct zd_mac *mac,
 717                            const struct ieee80211_rx_stats *stats,
 718                            const struct rx_status *status)
 719 {
 720         struct zd_rt_hdr *hdr = buffer;
 721
 722         hdr->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 723         hdr->rt_hdr.it_pad = 0;
 724         hdr->rt_hdr.it_len = cpu_to_le16(sizeof(struct zd_rt_hdr));
 725         hdr->rt_hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 726                                  (1 << IEEE80211_RADIOTAP_CHANNEL) |
 727                                  (1 << IEEE80211_RADIOTAP_RATE));
 728
 729         hdr->rt_flags = 0;
 730         if (status->decryption_type & (ZD_RX_WEP64|ZD_RX_WEP128|ZD_RX_WEP256))
 731                 hdr->rt_flags |= IEEE80211_RADIOTAP_F_WEP;
 732
 733         hdr->rt_rate = stats->rate / 5;
 734
 735         /* FIXME: 802.11a */
 736         hdr->rt_channel = cpu_to_le16(ieee80211chan2mhz(
 737                                              _zd_chip_get_channel(&mac->chip)));
 738         hdr->rt_chbitmask = cpu_to_le16(IEEE80211_CHAN_2GHZ |
 739                 ((status->frame_status & ZD_RX_FRAME_MODULATION_MASK) ==
 740                 ZD_RX_OFDM ? IEEE80211_CHAN_OFDM : IEEE80211_CHAN_CCK));
 741 }
 742
 743 /* Returns 1 if the data packet is for us and 0 otherwise. */
 744 static int is_data_packet_for_us(struct ieee80211_device *ieee,
 745                                  struct ieee80211_hdr_4addr *hdr)
 746 {
 747         struct net_device *netdev = ieee->dev;
 748         u16 fc = le16_to_cpu(hdr->frame_ctl);
 749
 750         ZD_ASSERT(WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA);
 751
 752         switch (ieee->iw_mode) {
 753         case IW_MODE_ADHOC:
 754                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) != 0 ||
 755                     memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) != 0)
 756                         return 0;
 757                 break;
 758         case IW_MODE_AUTO:
 759         case IW_MODE_INFRA:
 760                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) !=
 761                     IEEE80211_FCTL_FROMDS ||
 762                     memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) != 0)
 763                         return 0;
 764                 break;
 765         default:
 766                 ZD_ASSERT(ieee->iw_mode != IW_MODE_MONITOR);
 767                 return 0;
 768         }
 769
 770         return memcmp(hdr->addr1, netdev->dev_addr, ETH_ALEN) == 0 ||
 771                is_multicast_ether_addr(hdr->addr1) ||
 772                (netdev->flags & IFF_PROMISC);
 773 }
 774
 775 /* Filters received packets. The function returns 1 if the packet should be
 776  * forwarded to ieee80211_rx(). If the packet should be ignored the function
 777  * returns 0. If an invalid packet is found the function returns -EINVAL.
 778  *
 779  * The function calls ieee80211_rx_mgt() directly.
 780  *
 781  * It has been based on ieee80211_rx_any.
 782  */
 783 static int filter_rx(struct ieee80211_device *ieee,
 784                      const u8 *buffer, unsigned int length,
 785                      struct ieee80211_rx_stats *stats)
 786 {
 787         struct ieee80211_hdr_4addr *hdr;
 788         u16 fc;
 789
 790         if (ieee->iw_mode == IW_MODE_MONITOR)
 791                 return 1;
 792
 793         hdr = (struct ieee80211_hdr_4addr *)buffer;
 794         fc = le16_to_cpu(hdr->frame_ctl);
 795         if ((fc & IEEE80211_FCTL_VERS) != 0)
 796                 return -EINVAL;
 797
 798         switch (WLAN_FC_GET_TYPE(fc)) {
 799         case IEEE80211_FTYPE_MGMT:
 800                 if (length < sizeof(struct ieee80211_hdr_3addr))
 801                         return -EINVAL;
 802                 ieee80211_rx_mgt(ieee, hdr, stats);
 803                 return 0;
 804         case IEEE80211_FTYPE_CTL:
 805                 return 0;
 806         case IEEE80211_FTYPE_DATA:
 807                 /* Ignore invalid short buffers */
 808                 if (length < sizeof(struct ieee80211_hdr_3addr))
 809                         return -EINVAL;
 810                 return is_data_packet_for_us(ieee, hdr);
 811         }
 812
 813         return -EINVAL;
 814 }
 815
 816 static void update_qual_rssi(struct zd_mac *mac,
 817                              const u8 *buffer, unsigned int length,
 818                              u8 qual_percent, u8 rssi_percent)
 819 {
 820         unsigned long flags;
 821         struct ieee80211_hdr_3addr *hdr;
 822         int i;
 823
 824         hdr = (struct ieee80211_hdr_3addr *)buffer;
 825         if (length < offsetof(struct ieee80211_hdr_3addr, addr3))
 826                 return;
 827         if (memcmp(hdr->addr2, zd_mac_to_ieee80211(mac)->bssid, ETH_ALEN) != 0)
 828                 return;
 829
 830         spin_lock_irqsave(&mac->lock, flags);
 831         i = mac->stats_count % ZD_MAC_STATS_BUFFER_SIZE;
 832         mac->qual_buffer[i] = qual_percent;
 833         mac->rssi_buffer[i] = rssi_percent;
 834         mac->stats_count++;
 835         spin_unlock_irqrestore(&mac->lock, flags);
 836 }
 837
 838 static int fill_rx_stats(struct ieee80211_rx_stats *stats,
 839                          const struct rx_status **pstatus,
 840                          struct zd_mac *mac,
 841                          const u8 *buffer, unsigned int length)
 842 {
 843         const struct rx_status *status;
 844
 845         *pstatus = status = zd_tail(buffer, length, sizeof(struct rx_status));
 846         if (status->frame_status & ZD_RX_ERROR) {
 847                 /* FIXME: update? */
 848                 return -EINVAL;
 849         }
 850         memset(stats, 0, sizeof(struct ieee80211_rx_stats));
 851         stats->len = length - (ZD_PLCP_HEADER_SIZE + IEEE80211_FCS_LEN +
 852                                + sizeof(struct rx_status));
 853         /* FIXME: 802.11a */
 854         stats->freq = IEEE80211_24GHZ_BAND;
 855         stats->received_channel = _zd_chip_get_channel(&mac->chip);
 856         stats->rssi = zd_rx_strength_percent(status->signal_strength);
 857         stats->signal = zd_rx_qual_percent(buffer,
 858                                           length - sizeof(struct rx_status),
 859                                           status);
 860         stats->mask = IEEE80211_STATMASK_RSSI | IEEE80211_STATMASK_SIGNAL;
 861         stats->rate = zd_rx_rate(buffer, status);
 862         if (stats->rate)
 863                 stats->mask |= IEEE80211_STATMASK_RATE;
 864
 865         return 0;
 866 }
 867
 868 int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
 869 {
 870         int r;
 871         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 872         struct ieee80211_rx_stats stats;
 873         const struct rx_status *status;
 874         struct sk_buff *skb;
 875
 876         if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
 877                      IEEE80211_FCS_LEN + sizeof(struct rx_status))
 878                 return -EINVAL;
 879
 880         r = fill_rx_stats(&stats, &status, mac, buffer, length);
 881         if (r)
 882                 return r;
 883
 884         length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
 885                   sizeof(struct rx_status);
 886         buffer += ZD_PLCP_HEADER_SIZE;
 887
 888         update_qual_rssi(mac, buffer, length, stats.signal, stats.rssi);
 889
 890         r = filter_rx(ieee, buffer, length, &stats);
 891         if (r <= 0)
 892                 return r;
 893
 894         skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
 895         if (!skb)
 896                 return -ENOMEM;
 897         if (ieee->iw_mode == IW_MODE_MONITOR)
 898                 fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
 899                                &stats, status);
 900         memcpy(skb_put(skb, length), buffer, length);
 901
 902         r = ieee80211_rx(ieee, skb, &stats);
 903         if (!r) {
 904                 ZD_ASSERT(in_irq());
 905                 dev_kfree_skb_irq(skb);
 906         }
 907         return 0;
 908 }
 909
 910 static int netdev_tx(struct ieee80211_txb *txb, struct net_device *netdev,
 911                      int pri)
 912 {
 913         return zd_mac_tx(zd_netdev_mac(netdev), txb, pri);
 914 }
 915
 916 static void set_security(struct net_device *netdev,
 917                          struct ieee80211_security *sec)
 918 {
 919         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
 920         struct ieee80211_security *secinfo = &ieee->sec;
 921         int keyidx;
 922
 923         dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)), "\n");
 924
 925         for (keyidx = 0; keyidx<WEP_KEYS; keyidx++)
 926                 if (sec->flags & (1<<keyidx)) {
 927                         secinfo->encode_alg[keyidx] = sec->encode_alg[keyidx];
 928                         secinfo->key_sizes[keyidx] = sec->key_sizes[keyidx];
 929                         memcpy(secinfo->keys[keyidx], sec->keys[keyidx],
 930                                SCM_KEY_LEN);
 931                 }
 932
 933         if (sec->flags & SEC_ACTIVE_KEY) {
 934                 secinfo->active_key = sec->active_key;
 935                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 936                         "   .active_key = %d\n", sec->active_key);
 937         }
 938         if (sec->flags & SEC_UNICAST_GROUP) {
 939                 secinfo->unicast_uses_group = sec->unicast_uses_group;
 940                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 941                         "   .unicast_uses_group = %d\n",
 942                         sec->unicast_uses_group);
 943         }
 944         if (sec->flags & SEC_LEVEL) {
 945                 secinfo->level = sec->level;
 946                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 947                         "   .level = %d\n", sec->level);
 948         }
 949         if (sec->flags & SEC_ENABLED) {
 950                 secinfo->enabled = sec->enabled;
 951                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 952                         "   .enabled = %d\n", sec->enabled);
 953         }
 954         if (sec->flags & SEC_ENCRYPT) {
 955                 secinfo->encrypt = sec->encrypt;
 956                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 957                         "   .encrypt = %d\n", sec->encrypt);
 958         }
 959         if (sec->flags & SEC_AUTH_MODE) {
 960                 secinfo->auth_mode = sec->auth_mode;
 961                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 962                         "   .auth_mode = %d\n", sec->auth_mode);
 963         }
 964 }
 965
 966 static void ieee_init(struct ieee80211_device *ieee)
 967 {
 968         ieee->mode = IEEE_B | IEEE_G;
 969         ieee->freq_band = IEEE80211_24GHZ_BAND;
 970         ieee->modulation = IEEE80211_OFDM_MODULATION | IEEE80211_CCK_MODULATION;
 971         ieee->tx_headroom = sizeof(struct zd_ctrlset);
 972         ieee->set_security = set_security;
 973         ieee->hard_start_xmit = netdev_tx;
 974
 975         /* Software encryption/decryption for now */
 976         ieee->host_build_iv = 0;
 977         ieee->host_encrypt = 1;
 978         ieee->host_decrypt = 1;
 979
 980         /* FIXME: default to managed mode, until ieee80211 and zd1211rw can
 981          * correctly support AUTO */
 982         ieee->iw_mode = IW_MODE_INFRA;
 983 }
 984
 985 static void softmac_init(struct ieee80211softmac_device *sm)
 986 {
 987         sm->set_channel = set_channel;
 988 }
 989
 990 struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
 991 {
 992         struct zd_mac *mac = zd_netdev_mac(ndev);
 993         struct iw_statistics *iw_stats = &mac->iw_stats;
 994         unsigned int i, count, qual_total, rssi_total;
 995
 996         memset(iw_stats, 0, sizeof(struct iw_statistics));
 997         /* We are not setting the status, because ieee->state is not updated
 998          * at all and this driver doesn't track authentication state.
 999          */
1000         spin_lock_irq(&mac->lock);
1001         count = mac->stats_count < ZD_MAC_STATS_BUFFER_SIZE ?
1002                 mac->stats_count : ZD_MAC_STATS_BUFFER_SIZE;
1003         qual_total = rssi_total = 0;
1004         for (i = 0; i < count; i++) {
1005                 qual_total += mac->qual_buffer[i];
1006                 rssi_total += mac->rssi_buffer[i];
1007         }
1008         spin_unlock_irq(&mac->lock);
1009         iw_stats->qual.updated = IW_QUAL_NOISE_INVALID;
1010         if (count > 0) {
1011                 iw_stats->qual.qual = qual_total / count;
1012                 iw_stats->qual.level = rssi_total / count;
1013                 iw_stats->qual.updated |=
1014                         IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED;
1015         } else {
1016                 iw_stats->qual.updated |=
1017                         IW_QUAL_QUAL_INVALID|IW_QUAL_LEVEL_INVALID;
1018         }
1019         /* TODO: update counter */
1020         return iw_stats;
1021 }
1022
1023 #define LINK_LED_WORK_DELAY HZ
1024
1025 static void link_led_handler(void *p)
1026 {
1027         struct zd_mac *mac = p;
1028         struct zd_chip *chip = &mac->chip;
1029         struct ieee80211softmac_device *sm = ieee80211_priv(mac->netdev);
1030         int is_associated;
1031         int r;
1032
1033         spin_lock_irq(&mac->lock);
1034         is_associated = sm->associnfo.associated != 0;
1035         spin_unlock_irq(&mac->lock);
1036
1037         r = zd_chip_control_leds(chip,
1038                                  is_associated ? LED_ASSOCIATED : LED_SCANNING);
1039         if (r)
1040                 dev_err(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
1041
1042         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1043                            LINK_LED_WORK_DELAY);
1044 }
1045
1046 static void housekeeping_init(struct zd_mac *mac)
1047 {
1048         INIT_WORK(&mac->housekeeping.link_led_work, link_led_handler, mac);
1049 }
1050
1051 static void housekeeping_enable(struct zd_mac *mac)
1052 {
1053         dev_dbg_f(zd_mac_dev(mac), "\n");
1054         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1055                            0);
1056 }
1057
1058 static void housekeeping_disable(struct zd_mac *mac)
1059 {
1060         dev_dbg_f(zd_mac_dev(mac), "\n");
1061         cancel_rearming_delayed_workqueue(zd_workqueue,
1062                 &mac->housekeeping.link_led_work);
1063         zd_chip_control_leds(&mac->chip, LED_OFF);
1064 }