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 int zd_mac_get_channel(struct zd_mac *mac, u8 *channel, u8 *flags)
 321 {
 322         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 323
 324         *channel = zd_chip_get_channel(&mac->chip);
 325         if (ieee->iw_mode != IW_MODE_INFRA) {
 326                 spin_lock_irq(&mac->lock);
 327                 *flags = *channel == mac->requested_channel ?
 328                         MAC_FIXED_CHANNEL : 0;
 329                 spin_unlock(&mac->lock);
 330         } else {
 331                 *flags = 0;
 332         }
 333         dev_dbg_f(zd_mac_dev(mac), "channel %u flags %u\n", *channel, *flags);
 334         return 0;
 335 }
 336
 337 /* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */
 338 static u8 cs_typed_rate(u8 cs_rate)
 339 {
 340         static const u8 typed_rates[16] = {
 341                 [ZD_CS_CCK_RATE_1M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_1M,
 342                 [ZD_CS_CCK_RATE_2M]     = ZD_CS_CCK|ZD_CS_CCK_RATE_2M,
 343                 [ZD_CS_CCK_RATE_5_5M]   = ZD_CS_CCK|ZD_CS_CCK_RATE_5_5M,
 344                 [ZD_CS_CCK_RATE_11M]    = ZD_CS_CCK|ZD_CS_CCK_RATE_11M,
 345                 [ZD_OFDM_RATE_6M]       = ZD_CS_OFDM|ZD_OFDM_RATE_6M,
 346                 [ZD_OFDM_RATE_9M]       = ZD_CS_OFDM|ZD_OFDM_RATE_9M,
 347                 [ZD_OFDM_RATE_12M]      = ZD_CS_OFDM|ZD_OFDM_RATE_12M,
 348                 [ZD_OFDM_RATE_18M]      = ZD_CS_OFDM|ZD_OFDM_RATE_18M,
 349                 [ZD_OFDM_RATE_24M]      = ZD_CS_OFDM|ZD_OFDM_RATE_24M,
 350                 [ZD_OFDM_RATE_36M]      = ZD_CS_OFDM|ZD_OFDM_RATE_36M,
 351                 [ZD_OFDM_RATE_48M]      = ZD_CS_OFDM|ZD_OFDM_RATE_48M,
 352                 [ZD_OFDM_RATE_54M]      = ZD_CS_OFDM|ZD_OFDM_RATE_54M,
 353         };
 354
 355         ZD_ASSERT(ZD_CS_RATE_MASK == 0x0f);
 356         return typed_rates[cs_rate & ZD_CS_RATE_MASK];
 357 }
 358
 359 /* Fallback to lowest rate, if rate is unknown. */
 360 static u8 rate_to_cs_rate(u8 rate)
 361 {
 362         switch (rate) {
 363         case IEEE80211_CCK_RATE_2MB:
 364                 return ZD_CS_CCK_RATE_2M;
 365         case IEEE80211_CCK_RATE_5MB:
 366                 return ZD_CS_CCK_RATE_5_5M;
 367         case IEEE80211_CCK_RATE_11MB:
 368                 return ZD_CS_CCK_RATE_11M;
 369         case IEEE80211_OFDM_RATE_6MB:
 370                 return ZD_OFDM_RATE_6M;
 371         case IEEE80211_OFDM_RATE_9MB:
 372                 return ZD_OFDM_RATE_9M;
 373         case IEEE80211_OFDM_RATE_12MB:
 374                 return ZD_OFDM_RATE_12M;
 375         case IEEE80211_OFDM_RATE_18MB:
 376                 return ZD_OFDM_RATE_18M;
 377         case IEEE80211_OFDM_RATE_24MB:
 378                 return ZD_OFDM_RATE_24M;
 379         case IEEE80211_OFDM_RATE_36MB:
 380                 return ZD_OFDM_RATE_36M;
 381         case IEEE80211_OFDM_RATE_48MB:
 382                 return ZD_OFDM_RATE_48M;
 383         case IEEE80211_OFDM_RATE_54MB:
 384                 return ZD_OFDM_RATE_54M;
 385         }
 386         return ZD_CS_CCK_RATE_1M;
 387 }
 388
 389 int zd_mac_set_mode(struct zd_mac *mac, u32 mode)
 390 {
 391         struct ieee80211_device *ieee;
 392
 393         switch (mode) {
 394         case IW_MODE_AUTO:
 395         case IW_MODE_ADHOC:
 396         case IW_MODE_INFRA:
 397                 mac->netdev->type = ARPHRD_ETHER;
 398                 break;
 399         case IW_MODE_MONITOR:
 400                 mac->netdev->type = ARPHRD_IEEE80211_RADIOTAP;
 401                 break;
 402         default:
 403                 dev_dbg_f(zd_mac_dev(mac), "wrong mode %u\n", mode);
 404                 return -EINVAL;
 405         }
 406
 407         ieee = zd_mac_to_ieee80211(mac);
 408         ZD_ASSERT(!irqs_disabled());
 409         spin_lock_irq(&ieee->lock);
 410         ieee->iw_mode = mode;
 411         spin_unlock_irq(&ieee->lock);
 412
 413         if (netif_running(mac->netdev))
 414                 return reset_mode(mac);
 415
 416         return 0;
 417 }
 418
 419 int zd_mac_get_mode(struct zd_mac *mac, u32 *mode)
 420 {
 421         unsigned long flags;
 422         struct ieee80211_device *ieee;
 423
 424         ieee = zd_mac_to_ieee80211(mac);
 425         spin_lock_irqsave(&ieee->lock, flags);
 426         *mode = ieee->iw_mode;
 427         spin_unlock_irqrestore(&ieee->lock, flags);
 428         return 0;
 429 }
 430
 431 int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range)
 432 {
 433         int i;
 434         const struct channel_range *channel_range;
 435         u8 regdomain;
 436
 437         memset(range, 0, sizeof(*range));
 438
 439         /* FIXME: Not so important and depends on the mode. For 802.11g
 440          * usually this value is used. It seems to be that Bit/s number is
 441          * given here.
 442          */
 443         range->throughput = 27 * 1000 * 1000;
 444
 445         range->max_qual.qual = 100;
 446         range->max_qual.level = 100;
 447
 448         /* FIXME: Needs still to be tuned. */
 449         range->avg_qual.qual = 71;
 450         range->avg_qual.level = 80;
 451
 452         /* FIXME: depends on standard? */
 453         range->min_rts = 256;
 454         range->max_rts = 2346;
 455
 456         range->min_frag = MIN_FRAG_THRESHOLD;
 457         range->max_frag = MAX_FRAG_THRESHOLD;
 458
 459         range->max_encoding_tokens = WEP_KEYS;
 460         range->num_encoding_sizes = 2;
 461         range->encoding_size[0] = 5;
 462         range->encoding_size[1] = WEP_KEY_LEN;
 463
 464         range->we_version_compiled = WIRELESS_EXT;
 465         range->we_version_source = 20;
 466
 467         ZD_ASSERT(!irqs_disabled());
 468         spin_lock_irq(&mac->lock);
 469         regdomain = mac->regdomain;
 470         spin_unlock_irq(&mac->lock);
 471         channel_range = zd_channel_range(regdomain);
 472
 473         range->num_channels = channel_range->end - channel_range->start;
 474         range->old_num_channels = range->num_channels;
 475         range->num_frequency = range->num_channels;
 476         range->old_num_frequency = range->num_frequency;
 477
 478         for (i = 0; i < range->num_frequency; i++) {
 479                 struct iw_freq *freq = &range->freq[i];
 480                 freq->i = channel_range->start + i;
 481                 zd_channel_to_freq(freq, freq->i);
 482         }
 483
 484         return 0;
 485 }
 486
 487 static int zd_calc_tx_length_us(u8 *service, u8 cs_rate, u16 tx_length)
 488 {
 489         static const u8 rate_divisor[] = {
 490                 [ZD_CS_CCK_RATE_1M]     =  1,
 491                 [ZD_CS_CCK_RATE_2M]     =  2,
 492                 [ZD_CS_CCK_RATE_5_5M]   = 11, /* bits must be doubled */
 493                 [ZD_CS_CCK_RATE_11M]    = 11,
 494                 [ZD_OFDM_RATE_6M]       =  6,
 495                 [ZD_OFDM_RATE_9M]       =  9,
 496                 [ZD_OFDM_RATE_12M]      = 12,
 497                 [ZD_OFDM_RATE_18M]      = 18,
 498                 [ZD_OFDM_RATE_24M]      = 24,
 499                 [ZD_OFDM_RATE_36M]      = 36,
 500                 [ZD_OFDM_RATE_48M]      = 48,
 501                 [ZD_OFDM_RATE_54M]      = 54,
 502         };
 503
 504         u32 bits = (u32)tx_length * 8;
 505         u32 divisor;
 506
 507         divisor = rate_divisor[cs_rate];
 508         if (divisor == 0)
 509                 return -EINVAL;
 510
 511         switch (cs_rate) {
 512         case ZD_CS_CCK_RATE_5_5M:
 513                 bits = (2*bits) + 10; /* round up to the next integer */
 514                 break;
 515         case ZD_CS_CCK_RATE_11M:
 516                 if (service) {
 517                         u32 t = bits % 11;
 518                         *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 519                         if (0 < t && t <= 3) {
 520                                 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 521                         }
 522                 }
 523                 bits += 10; /* round up to the next integer */
 524                 break;
 525         }
 526
 527         return bits/divisor;
 528 }
 529
 530 enum {
 531         R2M_SHORT_PREAMBLE = 0x01,
 532         R2M_11A            = 0x02,
 533 };
 534
 535 static u8 cs_rate_to_modulation(u8 cs_rate, int flags)
 536 {
 537         u8 modulation;
 538
 539         modulation = cs_typed_rate(cs_rate);
 540         if (flags & R2M_SHORT_PREAMBLE) {
 541                 switch (ZD_CS_RATE(modulation)) {
 542                 case ZD_CS_CCK_RATE_2M:
 543                 case ZD_CS_CCK_RATE_5_5M:
 544                 case ZD_CS_CCK_RATE_11M:
 545                         modulation |= ZD_CS_CCK_PREA_SHORT;
 546                         return modulation;
 547                 }
 548         }
 549         if (flags & R2M_11A) {
 550                 if (ZD_CS_TYPE(modulation) == ZD_CS_OFDM)
 551                         modulation |= ZD_CS_OFDM_MODE_11A;
 552         }
 553         return modulation;
 554 }
 555
 556 static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs,
 557                               struct ieee80211_hdr_4addr *hdr)
 558 {
 559         struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
 560         u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl));
 561         u8 rate, cs_rate;
 562         int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0;
 563
 564         /* FIXME: 802.11a? short preamble? */
 565         rate = ieee80211softmac_suggest_txrate(softmac,
 566                 is_multicast_ether_addr(hdr->addr1), is_mgt);
 567
 568         cs_rate = rate_to_cs_rate(rate);
 569         cs->modulation = cs_rate_to_modulation(cs_rate, 0);
 570 }
 571
 572 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 573                            struct ieee80211_hdr_4addr *header)
 574 {
 575         unsigned int tx_length = le16_to_cpu(cs->tx_length);
 576         u16 fctl = le16_to_cpu(header->frame_ctl);
 577         u16 ftype = WLAN_FC_GET_TYPE(fctl);
 578         u16 stype = WLAN_FC_GET_STYPE(fctl);
 579
 580         /*
 581          * CONTROL:
 582          * - start at 0x00
 583          * - if fragment 0, enable bit 0
 584          * - if backoff needed, enable bit 0
 585          * - if burst (backoff not needed) disable bit 0
 586          * - if multicast, enable bit 1
 587          * - if PS-POLL frame, enable bit 2
 588          * - if in INDEPENDENT_BSS mode and zd1205_DestPowerSave, then enable
 589          *   bit 4 (FIXME: wtf)
 590          * - if frag_len > RTS threshold, set bit 5 as long if it isnt
 591          *   multicast or mgt
 592          * - if bit 5 is set, and we are in OFDM mode, unset bit 5 and set bit
 593          *   7
 594          */
 595
 596         cs->control = 0;
 597
 598         /* First fragment */
 599         if (WLAN_GET_SEQ_FRAG(le16_to_cpu(header->seq_ctl)) == 0)
 600                 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 601
 602         /* Multicast */
 603         if (is_multicast_ether_addr(header->addr1))
 604                 cs->control |= ZD_CS_MULTICAST;
 605
 606         /* PS-POLL */
 607         if (stype == IEEE80211_STYPE_PSPOLL)
 608                 cs->control |= ZD_CS_PS_POLL_FRAME;
 609
 610         if (!is_multicast_ether_addr(header->addr1) &&
 611             ftype != IEEE80211_FTYPE_MGMT &&
 612             tx_length > zd_netdev_ieee80211(mac->netdev)->rts)
 613         {
 614                 /* FIXME: check the logic */
 615                 if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM) {
 616                         /* 802.11g */
 617                         cs->control |= ZD_CS_SELF_CTS;
 618                 } else { /* 802.11b */
 619                         cs->control |= ZD_CS_RTS;
 620                 }
 621         }
 622
 623         /* FIXME: Management frame? */
 624 }
 625
 626 static int fill_ctrlset(struct zd_mac *mac,
 627                         struct ieee80211_txb *txb,
 628                         int frag_num)
 629 {
 630         int r;
 631         struct sk_buff *skb = txb->fragments[frag_num];
 632         struct ieee80211_hdr_4addr *hdr =
 633                 (struct ieee80211_hdr_4addr *) skb->data;
 634         unsigned int frag_len = skb->len + IEEE80211_FCS_LEN;
 635         unsigned int next_frag_len;
 636         unsigned int packet_length;
 637         struct zd_ctrlset *cs = (struct zd_ctrlset *)
 638                 skb_push(skb, sizeof(struct zd_ctrlset));
 639
 640         if (frag_num+1  < txb->nr_frags) {
 641                 next_frag_len = txb->fragments[frag_num+1]->len +
 642                                 IEEE80211_FCS_LEN;
 643         } else {
 644                 next_frag_len = 0;
 645         }
 646         ZD_ASSERT(frag_len <= 0xffff);
 647         ZD_ASSERT(next_frag_len <= 0xffff);
 648
 649         cs_set_modulation(mac, cs, hdr);
 650
 651         cs->tx_length = cpu_to_le16(frag_len);
 652
 653         cs_set_control(mac, cs, hdr);
 654
 655         packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
 656         ZD_ASSERT(packet_length <= 0xffff);
 657         /* ZD1211B: Computing the length difference this way, gives us
 658          * flexibility to compute the packet length.
 659          */
 660         cs->packet_length = cpu_to_le16(mac->chip.is_zd1211b ?
 661                         packet_length - frag_len : packet_length);
 662
 663         /*
 664          * CURRENT LENGTH:
 665          * - transmit frame length in microseconds
 666          * - seems to be derived from frame length
 667          * - see Cal_Us_Service() in zdinlinef.h
 668          * - if macp->bTxBurstEnable is enabled, then multiply by 4
 669          *  - bTxBurstEnable is never set in the vendor driver
 670          *
 671          * SERVICE:
 672          * - "for PLCP configuration"
 673          * - always 0 except in some situations at 802.11b 11M
 674          * - see line 53 of zdinlinef.h
 675          */
 676         cs->service = 0;
 677         r = zd_calc_tx_length_us(&cs->service, ZD_CS_RATE(cs->modulation),
 678                                  le16_to_cpu(cs->tx_length));
 679         if (r < 0)
 680                 return r;
 681         cs->current_length = cpu_to_le16(r);
 682
 683         if (next_frag_len == 0) {
 684                 cs->next_frame_length = 0;
 685         } else {
 686                 r = zd_calc_tx_length_us(NULL, ZD_CS_RATE(cs->modulation),
 687                                          next_frag_len);
 688                 if (r < 0)
 689                         return r;
 690                 cs->next_frame_length = cpu_to_le16(r);
 691         }
 692
 693         return 0;
 694 }
 695
 696 static int zd_mac_tx(struct zd_mac *mac, struct ieee80211_txb *txb, int pri)
 697 {
 698         int i, r;
 699
 700         for (i = 0; i < txb->nr_frags; i++) {
 701                 struct sk_buff *skb = txb->fragments[i];
 702
 703                 r = fill_ctrlset(mac, txb, i);
 704                 if (r)
 705                         return r;
 706                 r = zd_usb_tx(&mac->chip.usb, skb->data, skb->len);
 707                 if (r)
 708                         return r;
 709         }
 710
 711         /* FIXME: shouldn't this be handled by the upper layers? */
 712         mac->netdev->trans_start = jiffies;
 713
 714         ieee80211_txb_free(txb);
 715         return 0;
 716 }
 717
 718 struct zd_rt_hdr {
 719         struct ieee80211_radiotap_header rt_hdr;
 720         u8  rt_flags;
 721         u8  rt_rate;
 722         u16 rt_channel;
 723         u16 rt_chbitmask;
 724 };
 725
 726 static void fill_rt_header(void *buffer, struct zd_mac *mac,
 727                            const struct ieee80211_rx_stats *stats,
 728                            const struct rx_status *status)
 729 {
 730         struct zd_rt_hdr *hdr = buffer;
 731
 732         hdr->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 733         hdr->rt_hdr.it_pad = 0;
 734         hdr->rt_hdr.it_len = cpu_to_le16(sizeof(struct zd_rt_hdr));
 735         hdr->rt_hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 736                                  (1 << IEEE80211_RADIOTAP_CHANNEL) |
 737                                  (1 << IEEE80211_RADIOTAP_RATE));
 738
 739         hdr->rt_flags = 0;
 740         if (status->decryption_type & (ZD_RX_WEP64|ZD_RX_WEP128|ZD_RX_WEP256))
 741                 hdr->rt_flags |= IEEE80211_RADIOTAP_F_WEP;
 742
 743         hdr->rt_rate = stats->rate / 5;
 744
 745         /* FIXME: 802.11a */
 746         hdr->rt_channel = cpu_to_le16(ieee80211chan2mhz(
 747                                              _zd_chip_get_channel(&mac->chip)));
 748         hdr->rt_chbitmask = cpu_to_le16(IEEE80211_CHAN_2GHZ |
 749                 ((status->frame_status & ZD_RX_FRAME_MODULATION_MASK) ==
 750                 ZD_RX_OFDM ? IEEE80211_CHAN_OFDM : IEEE80211_CHAN_CCK));
 751 }
 752
 753 /* Returns 1 if the data packet is for us and 0 otherwise. */
 754 static int is_data_packet_for_us(struct ieee80211_device *ieee,
 755                                  struct ieee80211_hdr_4addr *hdr)
 756 {
 757         struct net_device *netdev = ieee->dev;
 758         u16 fc = le16_to_cpu(hdr->frame_ctl);
 759
 760         ZD_ASSERT(WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA);
 761
 762         switch (ieee->iw_mode) {
 763         case IW_MODE_ADHOC:
 764                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) != 0 ||
 765                     memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) != 0)
 766                         return 0;
 767                 break;
 768         case IW_MODE_AUTO:
 769         case IW_MODE_INFRA:
 770                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) !=
 771                     IEEE80211_FCTL_FROMDS ||
 772                     memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) != 0)
 773                         return 0;
 774                 break;
 775         default:
 776                 ZD_ASSERT(ieee->iw_mode != IW_MODE_MONITOR);
 777                 return 0;
 778         }
 779
 780         return memcmp(hdr->addr1, netdev->dev_addr, ETH_ALEN) == 0 ||
 781                is_multicast_ether_addr(hdr->addr1) ||
 782                (netdev->flags & IFF_PROMISC);
 783 }
 784
 785 /* Filters receiving packets. If it returns 1 send it to ieee80211_rx, if 0
 786  * return. If an error is detected -EINVAL is returned. ieee80211_rx_mgt() is
 787  * called here.
 788  *
 789  * It has been based on ieee80211_rx_any.
 790  */
 791 static int filter_rx(struct ieee80211_device *ieee,
 792                      const u8 *buffer, unsigned int length,
 793                      struct ieee80211_rx_stats *stats)
 794 {
 795         struct ieee80211_hdr_4addr *hdr;
 796         u16 fc;
 797
 798         if (ieee->iw_mode == IW_MODE_MONITOR)
 799                 return 1;
 800
 801         hdr = (struct ieee80211_hdr_4addr *)buffer;
 802         fc = le16_to_cpu(hdr->frame_ctl);
 803         if ((fc & IEEE80211_FCTL_VERS) != 0)
 804                 return -EINVAL;
 805
 806         switch (WLAN_FC_GET_TYPE(fc)) {
 807         case IEEE80211_FTYPE_MGMT:
 808                 if (length < sizeof(struct ieee80211_hdr_3addr))
 809                         return -EINVAL;
 810                 ieee80211_rx_mgt(ieee, hdr, stats);
 811                 return 0;
 812         case IEEE80211_FTYPE_CTL:
 813                 /* Ignore invalid short buffers */
 814                 return 0;
 815         case IEEE80211_FTYPE_DATA:
 816                 if (length < sizeof(struct ieee80211_hdr_3addr))
 817                         return -EINVAL;
 818                 return is_data_packet_for_us(ieee, hdr);
 819         }
 820
 821         return -EINVAL;
 822 }
 823
 824 static void update_qual_rssi(struct zd_mac *mac,
 825                              const u8 *buffer, unsigned int length,
 826                              u8 qual_percent, u8 rssi_percent)
 827 {
 828         unsigned long flags;
 829         struct ieee80211_hdr_3addr *hdr;
 830         int i;
 831
 832         hdr = (struct ieee80211_hdr_3addr *)buffer;
 833         if (length < offsetof(struct ieee80211_hdr_3addr, addr3))
 834                 return;
 835         if (memcmp(hdr->addr2, zd_mac_to_ieee80211(mac)->bssid, ETH_ALEN) != 0)
 836                 return;
 837
 838         spin_lock_irqsave(&mac->lock, flags);
 839         i = mac->stats_count % ZD_MAC_STATS_BUFFER_SIZE;
 840         mac->qual_buffer[i] = qual_percent;
 841         mac->rssi_buffer[i] = rssi_percent;
 842         mac->stats_count++;
 843         spin_unlock_irqrestore(&mac->lock, flags);
 844 }
 845
 846 static int fill_rx_stats(struct ieee80211_rx_stats *stats,
 847                          const struct rx_status **pstatus,
 848                          struct zd_mac *mac,
 849                          const u8 *buffer, unsigned int length)
 850 {
 851         const struct rx_status *status;
 852
 853         *pstatus = status = zd_tail(buffer, length, sizeof(struct rx_status));
 854         if (status->frame_status & ZD_RX_ERROR) {
 855                 /* FIXME: update? */
 856                 return -EINVAL;
 857         }
 858         memset(stats, 0, sizeof(struct ieee80211_rx_stats));
 859         stats->len = length - (ZD_PLCP_HEADER_SIZE + IEEE80211_FCS_LEN +
 860                                + sizeof(struct rx_status));
 861         /* FIXME: 802.11a */
 862         stats->freq = IEEE80211_24GHZ_BAND;
 863         stats->received_channel = _zd_chip_get_channel(&mac->chip);
 864         stats->rssi = zd_rx_strength_percent(status->signal_strength);
 865         stats->signal = zd_rx_qual_percent(buffer,
 866                                           length - sizeof(struct rx_status),
 867                                           status);
 868         stats->mask = IEEE80211_STATMASK_RSSI | IEEE80211_STATMASK_SIGNAL;
 869         stats->rate = zd_rx_rate(buffer, status);
 870         if (stats->rate)
 871                 stats->mask |= IEEE80211_STATMASK_RATE;
 872
 873         return 0;
 874 }
 875
 876 int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
 877 {
 878         int r;
 879         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 880         struct ieee80211_rx_stats stats;
 881         const struct rx_status *status;
 882         struct sk_buff *skb;
 883
 884         if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
 885                      IEEE80211_FCS_LEN + sizeof(struct rx_status))
 886                 return -EINVAL;
 887
 888         r = fill_rx_stats(&stats, &status, mac, buffer, length);
 889         if (r)
 890                 return r;
 891
 892         length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
 893                   sizeof(struct rx_status);
 894         buffer += ZD_PLCP_HEADER_SIZE;
 895
 896         update_qual_rssi(mac, buffer, length, stats.signal, stats.rssi);
 897
 898         r = filter_rx(ieee, buffer, length, &stats);
 899         if (r <= 0)
 900                 return r;
 901
 902         skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
 903         if (!skb)
 904                 return -ENOMEM;
 905         if (ieee->iw_mode == IW_MODE_MONITOR)
 906                 fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
 907                                &stats, status);
 908         memcpy(skb_put(skb, length), buffer, length);
 909
 910         r = ieee80211_rx(ieee, skb, &stats);
 911         if (!r) {
 912                 ZD_ASSERT(in_irq());
 913                 dev_kfree_skb_irq(skb);
 914         }
 915         return 0;
 916 }
 917
 918 static int netdev_tx(struct ieee80211_txb *txb, struct net_device *netdev,
 919                      int pri)
 920 {
 921         return zd_mac_tx(zd_netdev_mac(netdev), txb, pri);
 922 }
 923
 924 static void set_security(struct net_device *netdev,
 925                          struct ieee80211_security *sec)
 926 {
 927         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
 928         struct ieee80211_security *secinfo = &ieee->sec;
 929         int keyidx;
 930
 931         dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)), "\n");
 932
 933         for (keyidx = 0; keyidx<WEP_KEYS; keyidx++)
 934                 if (sec->flags & (1<<keyidx)) {
 935                         secinfo->encode_alg[keyidx] = sec->encode_alg[keyidx];
 936                         secinfo->key_sizes[keyidx] = sec->key_sizes[keyidx];
 937                         memcpy(secinfo->keys[keyidx], sec->keys[keyidx],
 938                                SCM_KEY_LEN);
 939                 }
 940
 941         if (sec->flags & SEC_ACTIVE_KEY) {
 942                 secinfo->active_key = sec->active_key;
 943                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 944                         "   .active_key = %d\n", sec->active_key);
 945         }
 946         if (sec->flags & SEC_UNICAST_GROUP) {
 947                 secinfo->unicast_uses_group = sec->unicast_uses_group;
 948                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 949                         "   .unicast_uses_group = %d\n",
 950                         sec->unicast_uses_group);
 951         }
 952         if (sec->flags & SEC_LEVEL) {
 953                 secinfo->level = sec->level;
 954                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 955                         "   .level = %d\n", sec->level);
 956         }
 957         if (sec->flags & SEC_ENABLED) {
 958                 secinfo->enabled = sec->enabled;
 959                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 960                         "   .enabled = %d\n", sec->enabled);
 961         }
 962         if (sec->flags & SEC_ENCRYPT) {
 963                 secinfo->encrypt = sec->encrypt;
 964                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 965                         "   .encrypt = %d\n", sec->encrypt);
 966         }
 967         if (sec->flags & SEC_AUTH_MODE) {
 968                 secinfo->auth_mode = sec->auth_mode;
 969                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
 970                         "   .auth_mode = %d\n", sec->auth_mode);
 971         }
 972 }
 973
 974 static void ieee_init(struct ieee80211_device *ieee)
 975 {
 976         ieee->mode = IEEE_B | IEEE_G;
 977         ieee->freq_band = IEEE80211_24GHZ_BAND;
 978         ieee->modulation = IEEE80211_OFDM_MODULATION | IEEE80211_CCK_MODULATION;
 979         ieee->tx_headroom = sizeof(struct zd_ctrlset);
 980         ieee->set_security = set_security;
 981         ieee->hard_start_xmit = netdev_tx;
 982
 983         /* Software encryption/decryption for now */
 984         ieee->host_build_iv = 0;
 985         ieee->host_encrypt = 1;
 986         ieee->host_decrypt = 1;
 987
 988         /* FIXME: default to managed mode, until ieee80211 and zd1211rw can
 989          * correctly support AUTO */
 990         ieee->iw_mode = IW_MODE_INFRA;
 991 }
 992
 993 static void softmac_init(struct ieee80211softmac_device *sm)
 994 {
 995         sm->set_channel = set_channel;
 996 }
 997
 998 struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
 999 {
1000         struct zd_mac *mac = zd_netdev_mac(ndev);
1001         struct iw_statistics *iw_stats = &mac->iw_stats;
1002         unsigned int i, count, qual_total, rssi_total;
1003
1004         memset(iw_stats, 0, sizeof(struct iw_statistics));
1005         /* We are not setting the status, because ieee->state is not updated
1006          * at all and this driver doesn't track authentication state.
1007          */
1008         spin_lock_irq(&mac->lock);
1009         count = mac->stats_count < ZD_MAC_STATS_BUFFER_SIZE ?
1010                 mac->stats_count : ZD_MAC_STATS_BUFFER_SIZE;
1011         qual_total = rssi_total = 0;
1012         for (i = 0; i < count; i++) {
1013                 qual_total += mac->qual_buffer[i];
1014                 rssi_total += mac->rssi_buffer[i];
1015         }
1016         spin_unlock_irq(&mac->lock);
1017         iw_stats->qual.updated = IW_QUAL_NOISE_INVALID;
1018         if (count > 0) {
1019                 iw_stats->qual.qual = qual_total / count;
1020                 iw_stats->qual.level = rssi_total / count;
1021                 iw_stats->qual.updated |=
1022                         IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED;
1023         } else {
1024                 iw_stats->qual.updated |=
1025                         IW_QUAL_QUAL_INVALID|IW_QUAL_LEVEL_INVALID;
1026         }
1027         /* TODO: update counter */
1028         return iw_stats;
1029 }
1030
1031 #ifdef DEBUG
1032 static const char* decryption_types[] = {
1033         [ZD_RX_NO_WEP] = "none",
1034         [ZD_RX_WEP64] = "WEP64",
1035         [ZD_RX_TKIP] = "TKIP",
1036         [ZD_RX_AES] = "AES",
1037         [ZD_RX_WEP128] = "WEP128",
1038         [ZD_RX_WEP256] = "WEP256",
1039 };
1040
1041 static const char *decryption_type_string(u8 type)
1042 {
1043         const char *s;
1044
1045         if (type < ARRAY_SIZE(decryption_types)) {
1046                 s = decryption_types[type];
1047         } else {
1048                 s = NULL;
1049         }
1050         return s ? s : "unknown";
1051 }
1052
1053 static int is_ofdm(u8 frame_status)
1054 {
1055         return (frame_status & ZD_RX_OFDM);
1056 }
1057
1058 void zd_dump_rx_status(const struct rx_status *status)
1059 {
1060         const char* modulation;
1061         u8 quality;
1062
1063         if (is_ofdm(status->frame_status)) {
1064                 modulation = "ofdm";
1065                 quality = status->signal_quality_ofdm;
1066         } else {
1067                 modulation = "cck";
1068                 quality = status->signal_quality_cck;
1069         }
1070         pr_debug("rx status %s strength %#04x qual %#04x decryption %s\n",
1071                 modulation, status->signal_strength, quality,
1072                 decryption_type_string(status->decryption_type));
1073         if (status->frame_status & ZD_RX_ERROR) {
1074                 pr_debug("rx error %s%s%s%s%s%s\n",
1075                         (status->frame_status & ZD_RX_TIMEOUT_ERROR) ?
1076                                 "timeout " : "",
1077                         (status->frame_status & ZD_RX_FIFO_OVERRUN_ERROR) ?
1078                                 "fifo " : "",
1079                         (status->frame_status & ZD_RX_DECRYPTION_ERROR) ?
1080                                 "decryption " : "",
1081                         (status->frame_status & ZD_RX_CRC32_ERROR) ?
1082                                 "crc32 " : "",
1083                         (status->frame_status & ZD_RX_NO_ADDR1_MATCH_ERROR) ?
1084                                 "addr1 " : "",
1085                         (status->frame_status & ZD_RX_CRC16_ERROR) ?
1086                                 "crc16" : "");
1087         }
1088 }
1089 #endif /* DEBUG */
1090
1091 #define LINK_LED_WORK_DELAY HZ
1092
1093 static void link_led_handler(void *p)
1094 {
1095         struct zd_mac *mac = p;
1096         struct zd_chip *chip = &mac->chip;
1097         struct ieee80211softmac_device *sm = ieee80211_priv(mac->netdev);
1098         int is_associated;
1099         int r;
1100
1101         spin_lock_irq(&mac->lock);
1102         is_associated = sm->associated != 0;
1103         spin_unlock_irq(&mac->lock);
1104
1105         r = zd_chip_control_leds(chip,
1106                                  is_associated ? LED_ASSOCIATED : LED_SCANNING);
1107         if (r)
1108                 dev_err(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
1109
1110         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1111                            LINK_LED_WORK_DELAY);
1112 }
1113
1114 static void housekeeping_init(struct zd_mac *mac)
1115 {
1116         INIT_WORK(&mac->housekeeping.link_led_work, link_led_handler, mac);
1117 }
1118
1119 static void housekeeping_enable(struct zd_mac *mac)
1120 {
1121         dev_dbg_f(zd_mac_dev(mac), "\n");
1122         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1123                            0);
1124 }
1125
1126 static void housekeeping_disable(struct zd_mac *mac)
1127 {
1128         dev_dbg_f(zd_mac_dev(mac), "\n");
1129         cancel_rearming_delayed_workqueue(zd_workqueue,
1130                 &mac->housekeeping.link_led_work);
1131         zd_chip_control_leds(&mac->chip, LED_OFF);
1132 }