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 static void set_rts_cts_work(void *d);
  36 static void set_basic_rates_work(void *d);
  37
  38 static void housekeeping_init(struct zd_mac *mac);
  39 static void housekeeping_enable(struct zd_mac *mac);
  40 static void housekeeping_disable(struct zd_mac *mac);
  41
  42 int zd_mac_init(struct zd_mac *mac,
  43                 struct net_device *netdev,
  44                 struct usb_interface *intf)
  45 {
  46         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
  47
  48         memset(mac, 0, sizeof(*mac));
  49         spin_lock_init(&mac->lock);
  50         mac->netdev = netdev;
  51         INIT_WORK(&mac->set_rts_cts_work, set_rts_cts_work, mac);
  52         INIT_WORK(&mac->set_basic_rates_work, set_basic_rates_work, mac);
  53
  54         ieee_init(ieee);
  55         softmac_init(ieee80211_priv(netdev));
  56         zd_chip_init(&mac->chip, netdev, intf);
  57         housekeeping_init(mac);
  58         return 0;
  59 }
  60
  61 static int reset_channel(struct zd_mac *mac)
  62 {
  63         int r;
  64         unsigned long flags;
  65         const struct channel_range *range;
  66
  67         spin_lock_irqsave(&mac->lock, flags);
  68         range = zd_channel_range(mac->regdomain);
  69         if (!range->start) {
  70                 r = -EINVAL;
  71                 goto out;
  72         }
  73         mac->requested_channel = range->start;
  74         r = 0;
  75 out:
  76         spin_unlock_irqrestore(&mac->lock, flags);
  77         return r;
  78 }
  79
  80 int zd_mac_init_hw(struct zd_mac *mac, u8 device_type)
  81 {
  82         int r;
  83         struct zd_chip *chip = &mac->chip;
  84         u8 addr[ETH_ALEN];
  85         u8 default_regdomain;
  86
  87         r = zd_chip_enable_int(chip);
  88         if (r)
  89                 goto out;
  90         r = zd_chip_init_hw(chip, device_type);
  91         if (r)
  92                 goto disable_int;
  93
  94         zd_get_e2p_mac_addr(chip, addr);
  95         r = zd_write_mac_addr(chip, addr);
  96         if (r)
  97                 goto disable_int;
  98         ZD_ASSERT(!irqs_disabled());
  99         spin_lock_irq(&mac->lock);
 100         memcpy(mac->netdev->dev_addr, addr, ETH_ALEN);
 101         spin_unlock_irq(&mac->lock);
 102
 103         r = zd_read_regdomain(chip, &default_regdomain);
 104         if (r)
 105                 goto disable_int;
 106         if (!zd_regdomain_supported(default_regdomain)) {
 107                 dev_dbg_f(zd_mac_dev(mac),
 108                           "Regulatory Domain %#04x is not supported.\n",
 109                           default_regdomain);
 110                 r = -EINVAL;
 111                 goto disable_int;
 112         }
 113         spin_lock_irq(&mac->lock);
 114         mac->regdomain = mac->default_regdomain = default_regdomain;
 115         spin_unlock_irq(&mac->lock);
 116         r = reset_channel(mac);
 117         if (r)
 118                 goto disable_int;
 119
 120         /* We must inform the device that we are doing encryption/decryption in
 121          * software at the moment. */
 122         r = zd_set_encryption_type(chip, ENC_SNIFFER);
 123         if (r)
 124                 goto disable_int;
 125
 126         r = zd_geo_init(zd_mac_to_ieee80211(mac), mac->regdomain);
 127         if (r)
 128                 goto disable_int;
 129
 130         r = 0;
 131 disable_int:
 132         zd_chip_disable_int(chip);
 133 out:
 134         return r;
 135 }
 136
 137 void zd_mac_clear(struct zd_mac *mac)
 138 {
 139         zd_chip_clear(&mac->chip);
 140         ZD_ASSERT(!spin_is_locked(&mac->lock));
 141         ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
 142 }
 143
 144 static int reset_mode(struct zd_mac *mac)
 145 {
 146         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 147         struct zd_ioreq32 ioreqs[3] = {
 148                 { CR_RX_FILTER, STA_RX_FILTER },
 149                 { CR_SNIFFER_ON, 0U },
 150         };
 151
 152         if (ieee->iw_mode == IW_MODE_MONITOR) {
 153                 ioreqs[0].value = 0xffffffff;
 154                 ioreqs[1].value = 0x1;
 155                 ioreqs[2].value = ENC_SNIFFER;
 156         }
 157
 158         return zd_iowrite32a(&mac->chip, ioreqs, 3);
 159 }
 160
 161 int zd_mac_open(struct net_device *netdev)
 162 {
 163         struct zd_mac *mac = zd_netdev_mac(netdev);
 164         struct zd_chip *chip = &mac->chip;
 165         int r;
 166
 167         r = zd_chip_enable_int(chip);
 168         if (r < 0)
 169                 goto out;
 170
 171         r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
 172         if (r < 0)
 173                 goto disable_int;
 174         r = reset_mode(mac);
 175         if (r)
 176                 goto disable_int;
 177         r = zd_chip_switch_radio_on(chip);
 178         if (r < 0)
 179                 goto disable_int;
 180         r = zd_chip_set_channel(chip, mac->requested_channel);
 181         if (r < 0)
 182                 goto disable_radio;
 183         r = zd_chip_enable_rx(chip);
 184         if (r < 0)
 185                 goto disable_radio;
 186         r = zd_chip_enable_hwint(chip);
 187         if (r < 0)
 188                 goto disable_rx;
 189
 190         housekeeping_enable(mac);
 191         ieee80211softmac_start(netdev);
 192         return 0;
 193 disable_rx:
 194         zd_chip_disable_rx(chip);
 195 disable_radio:
 196         zd_chip_switch_radio_off(chip);
 197 disable_int:
 198         zd_chip_disable_int(chip);
 199 out:
 200         return r;
 201 }
 202
 203 int zd_mac_stop(struct net_device *netdev)
 204 {
 205         struct zd_mac *mac = zd_netdev_mac(netdev);
 206         struct zd_chip *chip = &mac->chip;
 207
 208         netif_stop_queue(netdev);
 209
 210         /*
 211          * The order here deliberately is a little different from the open()
 212          * method, since we need to make sure there is no opportunity for RX
 213          * frames to be processed by softmac after we have stopped it.
 214          */
 215
 216         zd_chip_disable_rx(chip);
 217         housekeeping_disable(mac);
 218         ieee80211softmac_stop(netdev);
 219
 220         /* Ensure no work items are running or queued from this point */
 221         cancel_delayed_work(&mac->set_rts_cts_work);
 222         cancel_delayed_work(&mac->set_basic_rates_work);
 223         flush_workqueue(zd_workqueue);
 224         mac->updating_rts_rate = 0;
 225         mac->updating_basic_rates = 0;
 226
 227         zd_chip_disable_hwint(chip);
 228         zd_chip_switch_radio_off(chip);
 229         zd_chip_disable_int(chip);
 230
 231         return 0;
 232 }
 233
 234 int zd_mac_set_mac_address(struct net_device *netdev, void *p)
 235 {
 236         int r;
 237         unsigned long flags;
 238         struct sockaddr *addr = p;
 239         struct zd_mac *mac = zd_netdev_mac(netdev);
 240         struct zd_chip *chip = &mac->chip;
 241
 242         if (!is_valid_ether_addr(addr->sa_data))
 243                 return -EADDRNOTAVAIL;
 244
 245         dev_dbg_f(zd_mac_dev(mac),
 246                   "Setting MAC to " MAC_FMT "\n", MAC_ARG(addr->sa_data));
 247
 248         r = zd_write_mac_addr(chip, addr->sa_data);
 249         if (r)
 250                 return r;
 251
 252         spin_lock_irqsave(&mac->lock, flags);
 253         memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
 254         spin_unlock_irqrestore(&mac->lock, flags);
 255
 256         return 0;
 257 }
 258
 259 int zd_mac_set_regdomain(struct zd_mac *mac, u8 regdomain)
 260 {
 261         int r;
 262         u8 channel;
 263
 264         ZD_ASSERT(!irqs_disabled());
 265         spin_lock_irq(&mac->lock);
 266         if (regdomain == 0) {
 267                 regdomain = mac->default_regdomain;
 268         }
 269         if (!zd_regdomain_supported(regdomain)) {
 270                 spin_unlock_irq(&mac->lock);
 271                 return -EINVAL;
 272         }
 273         mac->regdomain = regdomain;
 274         channel = mac->requested_channel;
 275         spin_unlock_irq(&mac->lock);
 276
 277         r = zd_geo_init(zd_mac_to_ieee80211(mac), regdomain);
 278         if (r)
 279                 return r;
 280         if (!zd_regdomain_supports_channel(regdomain, channel)) {
 281                 r = reset_channel(mac);
 282                 if (r)
 283                         return r;
 284         }
 285
 286         return 0;
 287 }
 288
 289 u8 zd_mac_get_regdomain(struct zd_mac *mac)
 290 {
 291         unsigned long flags;
 292         u8 regdomain;
 293
 294         spin_lock_irqsave(&mac->lock, flags);
 295         regdomain = mac->regdomain;
 296         spin_unlock_irqrestore(&mac->lock, flags);
 297         return regdomain;
 298 }
 299
 300 /* Fallback to lowest rate, if rate is unknown. */
 301 static u8 rate_to_zd_rate(u8 rate)
 302 {
 303         switch (rate) {
 304         case IEEE80211_CCK_RATE_2MB:
 305                 return ZD_CCK_RATE_2M;
 306         case IEEE80211_CCK_RATE_5MB:
 307                 return ZD_CCK_RATE_5_5M;
 308         case IEEE80211_CCK_RATE_11MB:
 309                 return ZD_CCK_RATE_11M;
 310         case IEEE80211_OFDM_RATE_6MB:
 311                 return ZD_OFDM_RATE_6M;
 312         case IEEE80211_OFDM_RATE_9MB:
 313                 return ZD_OFDM_RATE_9M;
 314         case IEEE80211_OFDM_RATE_12MB:
 315                 return ZD_OFDM_RATE_12M;
 316         case IEEE80211_OFDM_RATE_18MB:
 317                 return ZD_OFDM_RATE_18M;
 318         case IEEE80211_OFDM_RATE_24MB:
 319                 return ZD_OFDM_RATE_24M;
 320         case IEEE80211_OFDM_RATE_36MB:
 321                 return ZD_OFDM_RATE_36M;
 322         case IEEE80211_OFDM_RATE_48MB:
 323                 return ZD_OFDM_RATE_48M;
 324         case IEEE80211_OFDM_RATE_54MB:
 325                 return ZD_OFDM_RATE_54M;
 326         }
 327         return ZD_CCK_RATE_1M;
 328 }
 329
 330 static u16 rate_to_cr_rate(u8 rate)
 331 {
 332         switch (rate) {
 333         case IEEE80211_CCK_RATE_2MB:
 334                 return CR_RATE_1M;
 335         case IEEE80211_CCK_RATE_5MB:
 336                 return CR_RATE_5_5M;
 337         case IEEE80211_CCK_RATE_11MB:
 338                 return CR_RATE_11M;
 339         case IEEE80211_OFDM_RATE_6MB:
 340                 return CR_RATE_6M;
 341         case IEEE80211_OFDM_RATE_9MB:
 342                 return CR_RATE_9M;
 343         case IEEE80211_OFDM_RATE_12MB:
 344                 return CR_RATE_12M;
 345         case IEEE80211_OFDM_RATE_18MB:
 346                 return CR_RATE_18M;
 347         case IEEE80211_OFDM_RATE_24MB:
 348                 return CR_RATE_24M;
 349         case IEEE80211_OFDM_RATE_36MB:
 350                 return CR_RATE_36M;
 351         case IEEE80211_OFDM_RATE_48MB:
 352                 return CR_RATE_48M;
 353         case IEEE80211_OFDM_RATE_54MB:
 354                 return CR_RATE_54M;
 355         }
 356         return CR_RATE_1M;
 357 }
 358
 359 static void try_enable_tx(struct zd_mac *mac)
 360 {
 361         unsigned long flags;
 362
 363         spin_lock_irqsave(&mac->lock, flags);
 364         if (mac->updating_rts_rate == 0 && mac->updating_basic_rates == 0)
 365                 netif_wake_queue(mac->netdev);
 366         spin_unlock_irqrestore(&mac->lock, flags);
 367 }
 368
 369 static void set_rts_cts_work(void *d)
 370 {
 371         struct zd_mac *mac = d;
 372         unsigned long flags;
 373         u8 rts_rate;
 374         unsigned int short_preamble;
 375
 376         mutex_lock(&mac->chip.mutex);
 377
 378         spin_lock_irqsave(&mac->lock, flags);
 379         mac->updating_rts_rate = 0;
 380         rts_rate = mac->rts_rate;
 381         short_preamble = mac->short_preamble;
 382         spin_unlock_irqrestore(&mac->lock, flags);
 383
 384         zd_chip_set_rts_cts_rate_locked(&mac->chip, rts_rate, short_preamble);
 385         mutex_unlock(&mac->chip.mutex);
 386
 387         try_enable_tx(mac);
 388 }
 389
 390 static void set_basic_rates_work(void *d)
 391 {
 392         struct zd_mac *mac = d;
 393         unsigned long flags;
 394         u16 basic_rates;
 395
 396         mutex_lock(&mac->chip.mutex);
 397
 398         spin_lock_irqsave(&mac->lock, flags);
 399         mac->updating_basic_rates = 0;
 400         basic_rates = mac->basic_rates;
 401         spin_unlock_irqrestore(&mac->lock, flags);
 402
 403         zd_chip_set_basic_rates_locked(&mac->chip, basic_rates);
 404         mutex_unlock(&mac->chip.mutex);
 405
 406         try_enable_tx(mac);
 407 }
 408
 409 static void bssinfo_change(struct net_device *netdev, u32 changes)
 410 {
 411         struct zd_mac *mac = zd_netdev_mac(netdev);
 412         struct ieee80211softmac_device *softmac = ieee80211_priv(netdev);
 413         struct ieee80211softmac_bss_info *bssinfo = &softmac->bssinfo;
 414         int need_set_rts_cts = 0;
 415         int need_set_rates = 0;
 416         u16 basic_rates;
 417         unsigned long flags;
 418
 419         dev_dbg_f(zd_mac_dev(mac), "changes: %x\n", changes);
 420
 421         if (changes & IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE) {
 422                 spin_lock_irqsave(&mac->lock, flags);
 423                 mac->short_preamble = bssinfo->short_preamble;
 424                 spin_unlock_irqrestore(&mac->lock, flags);
 425                 need_set_rts_cts = 1;
 426         }
 427
 428         if (changes & IEEE80211SOFTMAC_BSSINFOCHG_RATES) {
 429                 /* Set RTS rate to highest available basic rate */
 430                 u8 rate = ieee80211softmac_highest_supported_rate(softmac,
 431                         &bssinfo->supported_rates, 1);
 432                 rate = rate_to_zd_rate(rate);
 433
 434                 spin_lock_irqsave(&mac->lock, flags);
 435                 if (rate != mac->rts_rate) {
 436                         mac->rts_rate = rate;
 437                         need_set_rts_cts = 1;
 438                 }
 439                 spin_unlock_irqrestore(&mac->lock, flags);
 440
 441                 /* Set basic rates */
 442                 need_set_rates = 1;
 443                 if (bssinfo->supported_rates.count == 0) {
 444                         /* Allow the device to be flexible */
 445                         basic_rates = CR_RATES_80211B | CR_RATES_80211G;
 446                 } else {
 447                         int i = 0;
 448                         basic_rates = 0;
 449
 450                         for (i = 0; i < bssinfo->supported_rates.count; i++) {
 451                                 u16 rate = bssinfo->supported_rates.rates[i];
 452                                 if ((rate & IEEE80211_BASIC_RATE_MASK) == 0)
 453                                         continue;
 454
 455                                 rate &= ~IEEE80211_BASIC_RATE_MASK;
 456                                 basic_rates |= rate_to_cr_rate(rate);
 457                         }
 458                 }
 459                 spin_lock_irqsave(&mac->lock, flags);
 460                 mac->basic_rates = basic_rates;
 461                 spin_unlock_irqrestore(&mac->lock, flags);
 462         }
 463
 464         /* Schedule any changes we made above */
 465
 466         spin_lock_irqsave(&mac->lock, flags);
 467         if (need_set_rts_cts && !mac->updating_rts_rate) {
 468                 mac->updating_rts_rate = 1;
 469                 netif_stop_queue(mac->netdev);
 470                 queue_work(zd_workqueue, &mac->set_rts_cts_work);
 471         }
 472         if (need_set_rates && !mac->updating_basic_rates) {
 473                 mac->updating_basic_rates = 1;
 474                 netif_stop_queue(mac->netdev);
 475                 queue_work(zd_workqueue, &mac->set_basic_rates_work);
 476         }
 477         spin_unlock_irqrestore(&mac->lock, flags);
 478 }
 479
 480 static void set_channel(struct net_device *netdev, u8 channel)
 481 {
 482         struct zd_mac *mac = zd_netdev_mac(netdev);
 483
 484         dev_dbg_f(zd_mac_dev(mac), "channel %d\n", channel);
 485
 486         zd_chip_set_channel(&mac->chip, channel);
 487 }
 488
 489 int zd_mac_request_channel(struct zd_mac *mac, u8 channel)
 490 {
 491         unsigned long lock_flags;
 492         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
 493
 494         if (ieee->iw_mode == IW_MODE_INFRA)
 495                 return -EPERM;
 496
 497         spin_lock_irqsave(&mac->lock, lock_flags);
 498         if (!zd_regdomain_supports_channel(mac->regdomain, channel)) {
 499                 spin_unlock_irqrestore(&mac->lock, lock_flags);
 500                 return -EINVAL;
 501         }
 502         mac->requested_channel = channel;
 503         spin_unlock_irqrestore(&mac->lock, lock_flags);
 504         if (netif_running(mac->netdev))
 505                 return zd_chip_set_channel(&mac->chip, channel);
 506         else
 507                 return 0;
 508 }
 509
 510 u8 zd_mac_get_channel(struct zd_mac *mac)
 511 {
 512         u8 channel = zd_chip_get_channel(&mac->chip);
 513
 514         dev_dbg_f(zd_mac_dev(mac), "channel %u\n", channel);
 515         return channel;
 516 }
 517
 518 /* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */
 519 static u8 zd_rate_typed(u8 zd_rate)
 520 {
 521         static const u8 typed_rates[16] = {
 522                 [ZD_CCK_RATE_1M]        = ZD_CS_CCK|ZD_CCK_RATE_1M,
 523                 [ZD_CCK_RATE_2M]        = ZD_CS_CCK|ZD_CCK_RATE_2M,
 524                 [ZD_CCK_RATE_5_5M]      = ZD_CS_CCK|ZD_CCK_RATE_5_5M,
 525                 [ZD_CCK_RATE_11M]       = ZD_CS_CCK|ZD_CCK_RATE_11M,
 526                 [ZD_OFDM_RATE_6M]       = ZD_CS_OFDM|ZD_OFDM_RATE_6M,
 527                 [ZD_OFDM_RATE_9M]       = ZD_CS_OFDM|ZD_OFDM_RATE_9M,
 528                 [ZD_OFDM_RATE_12M]      = ZD_CS_OFDM|ZD_OFDM_RATE_12M,
 529                 [ZD_OFDM_RATE_18M]      = ZD_CS_OFDM|ZD_OFDM_RATE_18M,
 530                 [ZD_OFDM_RATE_24M]      = ZD_CS_OFDM|ZD_OFDM_RATE_24M,
 531                 [ZD_OFDM_RATE_36M]      = ZD_CS_OFDM|ZD_OFDM_RATE_36M,
 532                 [ZD_OFDM_RATE_48M]      = ZD_CS_OFDM|ZD_OFDM_RATE_48M,
 533                 [ZD_OFDM_RATE_54M]      = ZD_CS_OFDM|ZD_OFDM_RATE_54M,
 534         };
 535
 536         ZD_ASSERT(ZD_CS_RATE_MASK == 0x0f);
 537         return typed_rates[zd_rate & ZD_CS_RATE_MASK];
 538 }
 539
 540 int zd_mac_set_mode(struct zd_mac *mac, u32 mode)
 541 {
 542         struct ieee80211_device *ieee;
 543
 544         switch (mode) {
 545         case IW_MODE_AUTO:
 546         case IW_MODE_ADHOC:
 547         case IW_MODE_INFRA:
 548                 mac->netdev->type = ARPHRD_ETHER;
 549                 break;
 550         case IW_MODE_MONITOR:
 551                 mac->netdev->type = ARPHRD_IEEE80211_RADIOTAP;
 552                 break;
 553         default:
 554                 dev_dbg_f(zd_mac_dev(mac), "wrong mode %u\n", mode);
 555                 return -EINVAL;
 556         }
 557
 558         ieee = zd_mac_to_ieee80211(mac);
 559         ZD_ASSERT(!irqs_disabled());
 560         spin_lock_irq(&ieee->lock);
 561         ieee->iw_mode = mode;
 562         spin_unlock_irq(&ieee->lock);
 563
 564         if (netif_running(mac->netdev))
 565                 return reset_mode(mac);
 566
 567         return 0;
 568 }
 569
 570 int zd_mac_get_mode(struct zd_mac *mac, u32 *mode)
 571 {
 572         unsigned long flags;
 573         struct ieee80211_device *ieee;
 574
 575         ieee = zd_mac_to_ieee80211(mac);
 576         spin_lock_irqsave(&ieee->lock, flags);
 577         *mode = ieee->iw_mode;
 578         spin_unlock_irqrestore(&ieee->lock, flags);
 579         return 0;
 580 }
 581
 582 int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range)
 583 {
 584         int i;
 585         const struct channel_range *channel_range;
 586         u8 regdomain;
 587
 588         memset(range, 0, sizeof(*range));
 589
 590         /* FIXME: Not so important and depends on the mode. For 802.11g
 591          * usually this value is used. It seems to be that Bit/s number is
 592          * given here.
 593          */
 594         range->throughput = 27 * 1000 * 1000;
 595
 596         range->max_qual.qual = 100;
 597         range->max_qual.level = 100;
 598
 599         /* FIXME: Needs still to be tuned. */
 600         range->avg_qual.qual = 71;
 601         range->avg_qual.level = 80;
 602
 603         /* FIXME: depends on standard? */
 604         range->min_rts = 256;
 605         range->max_rts = 2346;
 606
 607         range->min_frag = MIN_FRAG_THRESHOLD;
 608         range->max_frag = MAX_FRAG_THRESHOLD;
 609
 610         range->max_encoding_tokens = WEP_KEYS;
 611         range->num_encoding_sizes = 2;
 612         range->encoding_size[0] = 5;
 613         range->encoding_size[1] = WEP_KEY_LEN;
 614
 615         range->we_version_compiled = WIRELESS_EXT;
 616         range->we_version_source = 20;
 617
 618         range->enc_capa = IW_ENC_CAPA_WPA |  IW_ENC_CAPA_WPA2 |
 619                           IW_ENC_CAPA_CIPHER_TKIP | IW_ENC_CAPA_CIPHER_CCMP;
 620
 621         ZD_ASSERT(!irqs_disabled());
 622         spin_lock_irq(&mac->lock);
 623         regdomain = mac->regdomain;
 624         spin_unlock_irq(&mac->lock);
 625         channel_range = zd_channel_range(regdomain);
 626
 627         range->num_channels = channel_range->end - channel_range->start;
 628         range->old_num_channels = range->num_channels;
 629         range->num_frequency = range->num_channels;
 630         range->old_num_frequency = range->num_frequency;
 631
 632         for (i = 0; i < range->num_frequency; i++) {
 633                 struct iw_freq *freq = &range->freq[i];
 634                 freq->i = channel_range->start + i;
 635                 zd_channel_to_freq(freq, freq->i);
 636         }
 637
 638         return 0;
 639 }
 640
 641 static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length)
 642 {
 643         static const u8 rate_divisor[] = {
 644                 [ZD_CCK_RATE_1M]        =  1,
 645                 [ZD_CCK_RATE_2M]        =  2,
 646                 [ZD_CCK_RATE_5_5M]      = 11, /* bits must be doubled */
 647                 [ZD_CCK_RATE_11M]       = 11,
 648                 [ZD_OFDM_RATE_6M]       =  6,
 649                 [ZD_OFDM_RATE_9M]       =  9,
 650                 [ZD_OFDM_RATE_12M]      = 12,
 651                 [ZD_OFDM_RATE_18M]      = 18,
 652                 [ZD_OFDM_RATE_24M]      = 24,
 653                 [ZD_OFDM_RATE_36M]      = 36,
 654                 [ZD_OFDM_RATE_48M]      = 48,
 655                 [ZD_OFDM_RATE_54M]      = 54,
 656         };
 657
 658         u32 bits = (u32)tx_length * 8;
 659         u32 divisor;
 660
 661         divisor = rate_divisor[zd_rate];
 662         if (divisor == 0)
 663                 return -EINVAL;
 664
 665         switch (zd_rate) {
 666         case ZD_CCK_RATE_5_5M:
 667                 bits = (2*bits) + 10; /* round up to the next integer */
 668                 break;
 669         case ZD_CCK_RATE_11M:
 670                 if (service) {
 671                         u32 t = bits % 11;
 672                         *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 673                         if (0 < t && t <= 3) {
 674                                 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
 675                         }
 676                 }
 677                 bits += 10; /* round up to the next integer */
 678                 break;
 679         }
 680
 681         return bits/divisor;
 682 }
 683
 684 enum {
 685         R2M_SHORT_PREAMBLE = 0x01,
 686         R2M_11A            = 0x02,
 687 };
 688
 689 static u8 zd_rate_to_modulation(u8 zd_rate, int flags)
 690 {
 691         u8 modulation;
 692
 693         modulation = zd_rate_typed(zd_rate);
 694         if (flags & R2M_SHORT_PREAMBLE) {
 695                 switch (ZD_CS_RATE(modulation)) {
 696                 case ZD_CCK_RATE_2M:
 697                 case ZD_CCK_RATE_5_5M:
 698                 case ZD_CCK_RATE_11M:
 699                         modulation |= ZD_CS_CCK_PREA_SHORT;
 700                         return modulation;
 701                 }
 702         }
 703         if (flags & R2M_11A) {
 704                 if (ZD_CS_TYPE(modulation) == ZD_CS_OFDM)
 705                         modulation |= ZD_CS_OFDM_MODE_11A;
 706         }
 707         return modulation;
 708 }
 709
 710 static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs,
 711                               struct ieee80211_hdr_4addr *hdr)
 712 {
 713         struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
 714         u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl));
 715         u8 rate, zd_rate;
 716         int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0;
 717         int is_multicast = is_multicast_ether_addr(hdr->addr1);
 718         int short_preamble = ieee80211softmac_short_preamble_ok(softmac,
 719                 is_multicast, is_mgt);
 720         int flags = 0;
 721
 722         /* FIXME: 802.11a? */
 723         rate = ieee80211softmac_suggest_txrate(softmac, is_multicast, is_mgt);
 724
 725         if (short_preamble)
 726                 flags |= R2M_SHORT_PREAMBLE;
 727
 728         zd_rate = rate_to_zd_rate(rate);
 729         cs->modulation = zd_rate_to_modulation(zd_rate, flags);
 730 }
 731
 732 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
 733                            struct ieee80211_hdr_4addr *header)
 734 {
 735         struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
 736         unsigned int tx_length = le16_to_cpu(cs->tx_length);
 737         u16 fctl = le16_to_cpu(header->frame_ctl);
 738         u16 ftype = WLAN_FC_GET_TYPE(fctl);
 739         u16 stype = WLAN_FC_GET_STYPE(fctl);
 740
 741         /*
 742          * CONTROL TODO:
 743          * - if backoff needed, enable bit 0
 744          * - if burst (backoff not needed) disable bit 0
 745          */
 746
 747         cs->control = 0;
 748
 749         /* First fragment */
 750         if (WLAN_GET_SEQ_FRAG(le16_to_cpu(header->seq_ctl)) == 0)
 751                 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
 752
 753         /* Multicast */
 754         if (is_multicast_ether_addr(header->addr1))
 755                 cs->control |= ZD_CS_MULTICAST;
 756
 757         /* PS-POLL */
 758         if (stype == IEEE80211_STYPE_PSPOLL)
 759                 cs->control |= ZD_CS_PS_POLL_FRAME;
 760
 761         /* Unicast data frames over the threshold should have RTS */
 762         if (!is_multicast_ether_addr(header->addr1) &&
 763                 ftype != IEEE80211_FTYPE_MGMT &&
 764                     tx_length > zd_netdev_ieee80211(mac->netdev)->rts)
 765                 cs->control |= ZD_CS_RTS;
 766
 767         /* Use CTS-to-self protection if required */
 768         if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM &&
 769                         ieee80211softmac_protection_needed(softmac)) {
 770                 /* FIXME: avoid sending RTS *and* self-CTS, is that correct? */
 771                 cs->control &= ~ZD_CS_RTS;
 772                 cs->control |= ZD_CS_SELF_CTS;
 773         }
 774
 775         /* FIXME: Management frame? */
 776 }
 777
 778 static int fill_ctrlset(struct zd_mac *mac,
 779                         struct ieee80211_txb *txb,
 780                         int frag_num)
 781 {
 782         int r;
 783         struct sk_buff *skb = txb->fragments[frag_num];
 784         struct ieee80211_hdr_4addr *hdr =
 785                 (struct ieee80211_hdr_4addr *) skb->data;
 786         unsigned int frag_len = skb->len + IEEE80211_FCS_LEN;
 787         unsigned int next_frag_len;
 788         unsigned int packet_length;
 789         struct zd_ctrlset *cs = (struct zd_ctrlset *)
 790                 skb_push(skb, sizeof(struct zd_ctrlset));
 791
 792         if (frag_num+1  < txb->nr_frags) {
 793                 next_frag_len = txb->fragments[frag_num+1]->len +
 794                                 IEEE80211_FCS_LEN;
 795         } else {
 796                 next_frag_len = 0;
 797         }
 798         ZD_ASSERT(frag_len <= 0xffff);
 799         ZD_ASSERT(next_frag_len <= 0xffff);
 800
 801         cs_set_modulation(mac, cs, hdr);
 802
 803         cs->tx_length = cpu_to_le16(frag_len);
 804
 805         cs_set_control(mac, cs, hdr);
 806
 807         packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
 808         ZD_ASSERT(packet_length <= 0xffff);
 809         /* ZD1211B: Computing the length difference this way, gives us
 810          * flexibility to compute the packet length.
 811          */
 812         cs->packet_length = cpu_to_le16(mac->chip.is_zd1211b ?
 813                         packet_length - frag_len : packet_length);
 814
 815         /*
 816          * CURRENT LENGTH:
 817          * - transmit frame length in microseconds
 818          * - seems to be derived from frame length
 819          * - see Cal_Us_Service() in zdinlinef.h
 820          * - if macp->bTxBurstEnable is enabled, then multiply by 4
 821          *  - bTxBurstEnable is never set in the vendor driver
 822          *
 823          * SERVICE:
 824          * - "for PLCP configuration"
 825          * - always 0 except in some situations at 802.11b 11M
 826          * - see line 53 of zdinlinef.h
 827          */
 828         cs->service = 0;
 829         r = zd_calc_tx_length_us(&cs->service, ZD_CS_RATE(cs->modulation),
 830                                  le16_to_cpu(cs->tx_length));
 831         if (r < 0)
 832                 return r;
 833         cs->current_length = cpu_to_le16(r);
 834
 835         if (next_frag_len == 0) {
 836                 cs->next_frame_length = 0;
 837         } else {
 838                 r = zd_calc_tx_length_us(NULL, ZD_CS_RATE(cs->modulation),
 839                                          next_frag_len);
 840                 if (r < 0)
 841                         return r;
 842                 cs->next_frame_length = cpu_to_le16(r);
 843         }
 844
 845         return 0;
 846 }
 847
 848 static int zd_mac_tx(struct zd_mac *mac, struct ieee80211_txb *txb, int pri)
 849 {
 850         int i, r;
 851
 852         for (i = 0; i < txb->nr_frags; i++) {
 853                 struct sk_buff *skb = txb->fragments[i];
 854
 855                 r = fill_ctrlset(mac, txb, i);
 856                 if (r)
 857                         return r;
 858                 r = zd_usb_tx(&mac->chip.usb, skb->data, skb->len);
 859                 if (r)
 860                         return r;
 861         }
 862
 863         /* FIXME: shouldn't this be handled by the upper layers? */
 864         mac->netdev->trans_start = jiffies;
 865
 866         ieee80211_txb_free(txb);
 867         return 0;
 868 }
 869
 870 struct zd_rt_hdr {
 871         struct ieee80211_radiotap_header rt_hdr;
 872         u8  rt_flags;
 873         u8  rt_rate;
 874         u16 rt_channel;
 875         u16 rt_chbitmask;
 876 } __attribute__((packed));
 877
 878 static void fill_rt_header(void *buffer, struct zd_mac *mac,
 879                            const struct ieee80211_rx_stats *stats,
 880                            const struct rx_status *status)
 881 {
 882         struct zd_rt_hdr *hdr = buffer;
 883
 884         hdr->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 885         hdr->rt_hdr.it_pad = 0;
 886         hdr->rt_hdr.it_len = cpu_to_le16(sizeof(struct zd_rt_hdr));
 887         hdr->rt_hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 888                                  (1 << IEEE80211_RADIOTAP_CHANNEL) |
 889                                  (1 << IEEE80211_RADIOTAP_RATE));
 890
 891         hdr->rt_flags = 0;
 892         if (status->decryption_type & (ZD_RX_WEP64|ZD_RX_WEP128|ZD_RX_WEP256))
 893                 hdr->rt_flags |= IEEE80211_RADIOTAP_F_WEP;
 894
 895         hdr->rt_rate = stats->rate / 5;
 896
 897         /* FIXME: 802.11a */
 898         hdr->rt_channel = cpu_to_le16(ieee80211chan2mhz(
 899                                              _zd_chip_get_channel(&mac->chip)));
 900         hdr->rt_chbitmask = cpu_to_le16(IEEE80211_CHAN_2GHZ |
 901                 ((status->frame_status & ZD_RX_FRAME_MODULATION_MASK) ==
 902                 ZD_RX_OFDM ? IEEE80211_CHAN_OFDM : IEEE80211_CHAN_CCK));
 903 }
 904
 905 /* Returns 1 if the data packet is for us and 0 otherwise. */
 906 static int is_data_packet_for_us(struct ieee80211_device *ieee,
 907                                  struct ieee80211_hdr_4addr *hdr)
 908 {
 909         struct net_device *netdev = ieee->dev;
 910         u16 fc = le16_to_cpu(hdr->frame_ctl);
 911
 912         ZD_ASSERT(WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA);
 913
 914         switch (ieee->iw_mode) {
 915         case IW_MODE_ADHOC:
 916                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) != 0 ||
 917                     memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) != 0)
 918                         return 0;
 919                 break;
 920         case IW_MODE_AUTO:
 921         case IW_MODE_INFRA:
 922                 if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) !=
 923                     IEEE80211_FCTL_FROMDS ||
 924                     memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) != 0)
 925                         return 0;
 926                 break;
 927         default:
 928                 ZD_ASSERT(ieee->iw_mode != IW_MODE_MONITOR);
 929                 return 0;
 930         }
 931
 932         return memcmp(hdr->addr1, netdev->dev_addr, ETH_ALEN) == 0 ||
 933                is_multicast_ether_addr(hdr->addr1) ||
 934                (netdev->flags & IFF_PROMISC);
 935 }
 936
 937 /* Filters received packets. The function returns 1 if the packet should be
 938  * forwarded to ieee80211_rx(). If the packet should be ignored the function
 939  * returns 0. If an invalid packet is found the function returns -EINVAL.
 940  *
 941  * The function calls ieee80211_rx_mgt() directly.
 942  *
 943  * It has been based on ieee80211_rx_any.
 944  */
 945 static int filter_rx(struct ieee80211_device *ieee,
 946                      const u8 *buffer, unsigned int length,
 947                      struct ieee80211_rx_stats *stats)
 948 {
 949         struct ieee80211_hdr_4addr *hdr;
 950         u16 fc;
 951
 952         if (ieee->iw_mode == IW_MODE_MONITOR)
 953                 return 1;
 954
 955         hdr = (struct ieee80211_hdr_4addr *)buffer;
 956         fc = le16_to_cpu(hdr->frame_ctl);
 957         if ((fc & IEEE80211_FCTL_VERS) != 0)
 958                 return -EINVAL;
 959
 960         switch (WLAN_FC_GET_TYPE(fc)) {
 961         case IEEE80211_FTYPE_MGMT:
 962                 if (length < sizeof(struct ieee80211_hdr_3addr))
 963                         return -EINVAL;
 964                 ieee80211_rx_mgt(ieee, hdr, stats);
 965                 return 0;
 966         case IEEE80211_FTYPE_CTL:
 967                 return 0;
 968         case IEEE80211_FTYPE_DATA:
 969                 /* Ignore invalid short buffers */
 970                 if (length < sizeof(struct ieee80211_hdr_3addr))
 971                         return -EINVAL;
 972                 return is_data_packet_for_us(ieee, hdr);
 973         }
 974
 975         return -EINVAL;
 976 }
 977
 978 static void update_qual_rssi(struct zd_mac *mac,
 979                              const u8 *buffer, unsigned int length,
 980                              u8 qual_percent, u8 rssi_percent)
 981 {
 982         unsigned long flags;
 983         struct ieee80211_hdr_3addr *hdr;
 984         int i;
 985
 986         hdr = (struct ieee80211_hdr_3addr *)buffer;
 987         if (length < offsetof(struct ieee80211_hdr_3addr, addr3))
 988                 return;
 989         if (memcmp(hdr->addr2, zd_mac_to_ieee80211(mac)->bssid, ETH_ALEN) != 0)
 990                 return;
 991
 992         spin_lock_irqsave(&mac->lock, flags);
 993         i = mac->stats_count % ZD_MAC_STATS_BUFFER_SIZE;
 994         mac->qual_buffer[i] = qual_percent;
 995         mac->rssi_buffer[i] = rssi_percent;
 996         mac->stats_count++;
 997         spin_unlock_irqrestore(&mac->lock, flags);
 998 }
 999
1000 static int fill_rx_stats(struct ieee80211_rx_stats *stats,
1001                          const struct rx_status **pstatus,
1002                          struct zd_mac *mac,
1003                          const u8 *buffer, unsigned int length)
1004 {
1005         const struct rx_status *status;
1006
1007         *pstatus = status = zd_tail(buffer, length, sizeof(struct rx_status));
1008         if (status->frame_status & ZD_RX_ERROR) {
1009                 /* FIXME: update? */
1010                 return -EINVAL;
1011         }
1012         memset(stats, 0, sizeof(struct ieee80211_rx_stats));
1013         stats->len = length - (ZD_PLCP_HEADER_SIZE + IEEE80211_FCS_LEN +
1014                                + sizeof(struct rx_status));
1015         /* FIXME: 802.11a */
1016         stats->freq = IEEE80211_24GHZ_BAND;
1017         stats->received_channel = _zd_chip_get_channel(&mac->chip);
1018         stats->rssi = zd_rx_strength_percent(status->signal_strength);
1019         stats->signal = zd_rx_qual_percent(buffer,
1020                                           length - sizeof(struct rx_status),
1021                                           status);
1022         stats->mask = IEEE80211_STATMASK_RSSI | IEEE80211_STATMASK_SIGNAL;
1023         stats->rate = zd_rx_rate(buffer, status);
1024         if (stats->rate)
1025                 stats->mask |= IEEE80211_STATMASK_RATE;
1026
1027         return 0;
1028 }
1029
1030 int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
1031 {
1032         int r;
1033         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
1034         struct ieee80211_rx_stats stats;
1035         const struct rx_status *status;
1036         struct sk_buff *skb;
1037
1038         if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
1039                      IEEE80211_FCS_LEN + sizeof(struct rx_status))
1040                 return -EINVAL;
1041
1042         r = fill_rx_stats(&stats, &status, mac, buffer, length);
1043         if (r)
1044                 return r;
1045
1046         length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
1047                   sizeof(struct rx_status);
1048         buffer += ZD_PLCP_HEADER_SIZE;
1049
1050         update_qual_rssi(mac, buffer, length, stats.signal, stats.rssi);
1051
1052         r = filter_rx(ieee, buffer, length, &stats);
1053         if (r <= 0)
1054                 return r;
1055
1056         skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
1057         if (!skb)
1058                 return -ENOMEM;
1059         if (ieee->iw_mode == IW_MODE_MONITOR)
1060                 fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
1061                                &stats, status);
1062         memcpy(skb_put(skb, length), buffer, length);
1063
1064         r = ieee80211_rx(ieee, skb, &stats);
1065         if (!r)
1066                 dev_kfree_skb_any(skb);
1067         return 0;
1068 }
1069
1070 static int netdev_tx(struct ieee80211_txb *txb, struct net_device *netdev,
1071                      int pri)
1072 {
1073         return zd_mac_tx(zd_netdev_mac(netdev), txb, pri);
1074 }
1075
1076 static void set_security(struct net_device *netdev,
1077                          struct ieee80211_security *sec)
1078 {
1079         struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
1080         struct ieee80211_security *secinfo = &ieee->sec;
1081         int keyidx;
1082
1083         dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)), "\n");
1084
1085         for (keyidx = 0; keyidx<WEP_KEYS; keyidx++)
1086                 if (sec->flags & (1<<keyidx)) {
1087                         secinfo->encode_alg[keyidx] = sec->encode_alg[keyidx];
1088                         secinfo->key_sizes[keyidx] = sec->key_sizes[keyidx];
1089                         memcpy(secinfo->keys[keyidx], sec->keys[keyidx],
1090                                SCM_KEY_LEN);
1091                 }
1092
1093         if (sec->flags & SEC_ACTIVE_KEY) {
1094                 secinfo->active_key = sec->active_key;
1095                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
1096                         "   .active_key = %d\n", sec->active_key);
1097         }
1098         if (sec->flags & SEC_UNICAST_GROUP) {
1099                 secinfo->unicast_uses_group = sec->unicast_uses_group;
1100                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
1101                         "   .unicast_uses_group = %d\n",
1102                         sec->unicast_uses_group);
1103         }
1104         if (sec->flags & SEC_LEVEL) {
1105                 secinfo->level = sec->level;
1106                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
1107                         "   .level = %d\n", sec->level);
1108         }
1109         if (sec->flags & SEC_ENABLED) {
1110                 secinfo->enabled = sec->enabled;
1111                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
1112                         "   .enabled = %d\n", sec->enabled);
1113         }
1114         if (sec->flags & SEC_ENCRYPT) {
1115                 secinfo->encrypt = sec->encrypt;
1116                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
1117                         "   .encrypt = %d\n", sec->encrypt);
1118         }
1119         if (sec->flags & SEC_AUTH_MODE) {
1120                 secinfo->auth_mode = sec->auth_mode;
1121                 dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
1122                         "   .auth_mode = %d\n", sec->auth_mode);
1123         }
1124 }
1125
1126 static void ieee_init(struct ieee80211_device *ieee)
1127 {
1128         ieee->mode = IEEE_B | IEEE_G;
1129         ieee->freq_band = IEEE80211_24GHZ_BAND;
1130         ieee->modulation = IEEE80211_OFDM_MODULATION | IEEE80211_CCK_MODULATION;
1131         ieee->tx_headroom = sizeof(struct zd_ctrlset);
1132         ieee->set_security = set_security;
1133         ieee->hard_start_xmit = netdev_tx;
1134
1135         /* Software encryption/decryption for now */
1136         ieee->host_build_iv = 0;
1137         ieee->host_encrypt = 1;
1138         ieee->host_decrypt = 1;
1139
1140         /* FIXME: default to managed mode, until ieee80211 and zd1211rw can
1141          * correctly support AUTO */
1142         ieee->iw_mode = IW_MODE_INFRA;
1143 }
1144
1145 static void softmac_init(struct ieee80211softmac_device *sm)
1146 {
1147         sm->set_channel = set_channel;
1148         sm->bssinfo_change = bssinfo_change;
1149 }
1150
1151 struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
1152 {
1153         struct zd_mac *mac = zd_netdev_mac(ndev);
1154         struct iw_statistics *iw_stats = &mac->iw_stats;
1155         unsigned int i, count, qual_total, rssi_total;
1156
1157         memset(iw_stats, 0, sizeof(struct iw_statistics));
1158         /* We are not setting the status, because ieee->state is not updated
1159          * at all and this driver doesn't track authentication state.
1160          */
1161         spin_lock_irq(&mac->lock);
1162         count = mac->stats_count < ZD_MAC_STATS_BUFFER_SIZE ?
1163                 mac->stats_count : ZD_MAC_STATS_BUFFER_SIZE;
1164         qual_total = rssi_total = 0;
1165         for (i = 0; i < count; i++) {
1166                 qual_total += mac->qual_buffer[i];
1167                 rssi_total += mac->rssi_buffer[i];
1168         }
1169         spin_unlock_irq(&mac->lock);
1170         iw_stats->qual.updated = IW_QUAL_NOISE_INVALID;
1171         if (count > 0) {
1172                 iw_stats->qual.qual = qual_total / count;
1173                 iw_stats->qual.level = rssi_total / count;
1174                 iw_stats->qual.updated |=
1175                         IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED;
1176         } else {
1177                 iw_stats->qual.updated |=
1178                         IW_QUAL_QUAL_INVALID|IW_QUAL_LEVEL_INVALID;
1179         }
1180         /* TODO: update counter */
1181         return iw_stats;
1182 }
1183
1184 #define LINK_LED_WORK_DELAY HZ
1185
1186 static void link_led_handler(void *p)
1187 {
1188         struct zd_mac *mac = p;
1189         struct zd_chip *chip = &mac->chip;
1190         struct ieee80211softmac_device *sm = ieee80211_priv(mac->netdev);
1191         int is_associated;
1192         int r;
1193
1194         spin_lock_irq(&mac->lock);
1195         is_associated = sm->associnfo.associated != 0;
1196         spin_unlock_irq(&mac->lock);
1197
1198         r = zd_chip_control_leds(chip,
1199                                  is_associated ? LED_ASSOCIATED : LED_SCANNING);
1200         if (r)
1201                 dev_err(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
1202
1203         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1204                            LINK_LED_WORK_DELAY);
1205 }
1206
1207 static void housekeeping_init(struct zd_mac *mac)
1208 {
1209         INIT_WORK(&mac->housekeeping.link_led_work, link_led_handler, mac);
1210 }
1211
1212 static void housekeeping_enable(struct zd_mac *mac)
1213 {
1214         dev_dbg_f(zd_mac_dev(mac), "\n");
1215         queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1216                            0);
1217 }
1218
1219 static void housekeeping_disable(struct zd_mac *mac)
1220 {
1221         dev_dbg_f(zd_mac_dev(mac), "\n");
1222         cancel_rearming_delayed_workqueue(zd_workqueue,
1223                 &mac->housekeeping.link_led_work);
1224         zd_chip_control_leds(&mac->chip, LED_OFF);
1225 }