1/* 2 * mac80211 glue code for mac80211 Prism54 drivers 3 * 4 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net> 5 * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de> 6 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> 7 * 8 * Based on: 9 * - the islsm (softmac prism54) driver, which is: 10 * Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al. 11 * - stlc45xx driver 12 * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies). 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License version 2 as 16 * published by the Free Software Foundation. 17 */ 18 19#include <linux/init.h> 20#include <linux/slab.h> 21#include <linux/firmware.h> 22#include <linux/etherdevice.h> 23 24#include <net/mac80211.h> 25 26#include "p54.h" 27#include "lmac.h" 28 29static int modparam_nohwcrypt; 30module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO); 31MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption."); 32MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>"); 33MODULE_DESCRIPTION("Softmac Prism54 common code"); 34MODULE_LICENSE("GPL"); 35MODULE_ALIAS("prism54common"); 36 37static int p54_sta_add_remove(struct ieee80211_hw *hw, 38 struct ieee80211_vif *vif, 39 struct ieee80211_sta *sta) 40{ 41 struct p54_common *priv = hw->priv; 42 43 /* 44 * Notify the firmware that we don't want or we don't 45 * need to buffer frames for this station anymore. 46 */ 47 48 p54_sta_unlock(priv, sta->addr); 49 50 return 0; 51} 52 53static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif, 54 enum sta_notify_cmd notify_cmd, 55 struct ieee80211_sta *sta) 56{ 57 struct p54_common *priv = dev->priv; 58 59 switch (notify_cmd) { 60 case STA_NOTIFY_AWAKE: 61 /* update the firmware's filter table */ 62 p54_sta_unlock(priv, sta->addr); 63 break; 64 default: 65 break; 66 } 67} 68 69static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta, 70 bool set) 71{ 72 struct p54_common *priv = dev->priv; 73 74 return p54_update_beacon_tim(priv, sta->aid, set); 75} 76 77u8 *p54_find_ie(struct sk_buff *skb, u8 ie) 78{ 79 struct ieee80211_mgmt *mgmt = (void *)skb->data; 80 u8 *pos, *end; 81 82 if (skb->len <= sizeof(mgmt)) 83 return NULL; 84 85 pos = (u8 *)mgmt->u.beacon.variable; 86 end = skb->data + skb->len; 87 while (pos < end) { 88 if (pos + 2 + pos[1] > end) 89 return NULL; 90 91 if (pos[0] == ie) 92 return pos; 93 94 pos += 2 + pos[1]; 95 } 96 return NULL; 97} 98 99static int p54_beacon_format_ie_tim(struct sk_buff *skb) 100{ 101 /* 102 * the good excuse for this mess is ... the firmware. 103 * The dummy TIM MUST be at the end of the beacon frame, 104 * because it'll be overwritten! 105 */ 106 u8 *tim; 107 u8 dtim_len; 108 u8 dtim_period; 109 u8 *next; 110 111 tim = p54_find_ie(skb, WLAN_EID_TIM); 112 if (!tim) 113 return 0; 114 115 dtim_len = tim[1]; 116 dtim_period = tim[3]; 117 next = tim + 2 + dtim_len; 118 119 if (dtim_len < 3) 120 return -EINVAL; 121 122 memmove(tim, next, skb_tail_pointer(skb) - next); 123 tim = skb_tail_pointer(skb) - (dtim_len + 2); 124 125 /* add the dummy at the end */ 126 tim[0] = WLAN_EID_TIM; 127 tim[1] = 3; 128 tim[2] = 0; 129 tim[3] = dtim_period; 130 tim[4] = 0; 131 132 if (dtim_len > 3) 133 skb_trim(skb, skb->len - (dtim_len - 3)); 134 135 return 0; 136} 137 138static int p54_beacon_update(struct p54_common *priv, 139 struct ieee80211_vif *vif) 140{ 141 struct sk_buff *beacon; 142 int ret; 143 144 beacon = ieee80211_beacon_get(priv->hw, vif); 145 if (!beacon) 146 return -ENOMEM; 147 ret = p54_beacon_format_ie_tim(beacon); 148 if (ret) 149 return ret; 150 151 /* 152 * During operation, the firmware takes care of beaconing. 153 * The driver only needs to upload a new beacon template, once 154 * the template was changed by the stack or userspace. 155 * 156 * LMAC API 3.2.2 also specifies that the driver does not need 157 * to cancel the old beacon template by hand, instead the firmware 158 * will release the previous one through the feedback mechanism. 159 */ 160 WARN_ON(p54_tx_80211(priv->hw, beacon)); 161 priv->tsf_high32 = 0; 162 priv->tsf_low32 = 0; 163 164 return 0; 165} 166 167static int p54_start(struct ieee80211_hw *dev) 168{ 169 struct p54_common *priv = dev->priv; 170 int err; 171 172 mutex_lock(&priv->conf_mutex); 173 err = priv->open(dev); 174 if (err) 175 goto out; 176 P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47); 177 P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94); 178 P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0); 179 P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0); 180 err = p54_set_edcf(priv); 181 if (err) 182 goto out; 183 184 memset(priv->bssid, ~0, ETH_ALEN); 185 priv->mode = NL80211_IFTYPE_MONITOR; 186 err = p54_setup_mac(priv); 187 if (err) { 188 priv->mode = NL80211_IFTYPE_UNSPECIFIED; 189 goto out; 190 } 191 192 ieee80211_queue_delayed_work(dev, &priv->work, 0); 193 194 priv->softled_state = 0; 195 err = p54_set_leds(priv); 196 197out: 198 mutex_unlock(&priv->conf_mutex); 199 return err; 200} 201 202static void p54_stop(struct ieee80211_hw *dev) 203{ 204 struct p54_common *priv = dev->priv; 205 int i; 206 207 mutex_lock(&priv->conf_mutex); 208 priv->mode = NL80211_IFTYPE_UNSPECIFIED; 209 priv->softled_state = 0; 210 p54_set_leds(priv); 211 212 cancel_delayed_work_sync(&priv->work); 213 214 priv->stop(dev); 215 skb_queue_purge(&priv->tx_pending); 216 skb_queue_purge(&priv->tx_queue); 217 for (i = 0; i < P54_QUEUE_NUM; i++) { 218 priv->tx_stats[i].count = 0; 219 priv->tx_stats[i].len = 0; 220 } 221 222 priv->beacon_req_id = cpu_to_le32(0); 223 priv->tsf_high32 = priv->tsf_low32 = 0; 224 mutex_unlock(&priv->conf_mutex); 225} 226 227static int p54_add_interface(struct ieee80211_hw *dev, 228 struct ieee80211_vif *vif) 229{ 230 struct p54_common *priv = dev->priv; 231 232 mutex_lock(&priv->conf_mutex); 233 if (priv->mode != NL80211_IFTYPE_MONITOR) { 234 mutex_unlock(&priv->conf_mutex); 235 return -EOPNOTSUPP; 236 } 237 238 priv->vif = vif; 239 240 switch (vif->type) { 241 case NL80211_IFTYPE_STATION: 242 case NL80211_IFTYPE_ADHOC: 243 case NL80211_IFTYPE_AP: 244 case NL80211_IFTYPE_MESH_POINT: 245 priv->mode = vif->type; 246 break; 247 default: 248 mutex_unlock(&priv->conf_mutex); 249 return -EOPNOTSUPP; 250 } 251 252 memcpy(priv->mac_addr, vif->addr, ETH_ALEN); 253 p54_setup_mac(priv); 254 mutex_unlock(&priv->conf_mutex); 255 return 0; 256} 257 258static void p54_remove_interface(struct ieee80211_hw *dev, 259 struct ieee80211_vif *vif) 260{ 261 struct p54_common *priv = dev->priv; 262 263 mutex_lock(&priv->conf_mutex); 264 priv->vif = NULL; 265 266 /* 267 * LMAC API 3.2.2 states that any active beacon template must be 268 * canceled by the driver before attempting a mode transition. 269 */ 270 if (le32_to_cpu(priv->beacon_req_id) != 0) { 271 p54_tx_cancel(priv, priv->beacon_req_id); 272 wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ); 273 } 274 priv->mode = NL80211_IFTYPE_MONITOR; 275 memset(priv->mac_addr, 0, ETH_ALEN); 276 memset(priv->bssid, 0, ETH_ALEN); 277 p54_setup_mac(priv); 278 mutex_unlock(&priv->conf_mutex); 279} 280 281static int p54_config(struct ieee80211_hw *dev, u32 changed) 282{ 283 int ret = 0; 284 struct p54_common *priv = dev->priv; 285 struct ieee80211_conf *conf = &dev->conf; 286 287 mutex_lock(&priv->conf_mutex); 288 if (changed & IEEE80211_CONF_CHANGE_POWER) 289 priv->output_power = conf->power_level << 2; 290 if (changed & IEEE80211_CONF_CHANGE_CHANNEL) { 291 ret = p54_scan(priv, P54_SCAN_EXIT, 0); 292 if (ret) 293 goto out; 294 } 295 if (changed & IEEE80211_CONF_CHANGE_PS) { 296 ret = p54_set_ps(priv); 297 if (ret) 298 goto out; 299 } 300 if (changed & IEEE80211_CONF_CHANGE_IDLE) { 301 ret = p54_setup_mac(priv); 302 if (ret) 303 goto out; 304 } 305 306out: 307 mutex_unlock(&priv->conf_mutex); 308 return ret; 309} 310 311static void p54_configure_filter(struct ieee80211_hw *dev, 312 unsigned int changed_flags, 313 unsigned int *total_flags, 314 u64 multicast) 315{ 316 struct p54_common *priv = dev->priv; 317 318 *total_flags &= FIF_PROMISC_IN_BSS | 319 FIF_OTHER_BSS; 320 321 priv->filter_flags = *total_flags; 322 323 if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS)) 324 p54_setup_mac(priv); 325} 326 327static int p54_conf_tx(struct ieee80211_hw *dev, u16 queue, 328 const struct ieee80211_tx_queue_params *params) 329{ 330 struct p54_common *priv = dev->priv; 331 int ret; 332 333 mutex_lock(&priv->conf_mutex); 334 if (queue < dev->queues) { 335 P54_SET_QUEUE(priv->qos_params[queue], params->aifs, 336 params->cw_min, params->cw_max, params->txop); 337 ret = p54_set_edcf(priv); 338 } else 339 ret = -EINVAL; 340 mutex_unlock(&priv->conf_mutex); 341 return ret; 342} 343 344static void p54_work(struct work_struct *work) 345{ 346 struct p54_common *priv = container_of(work, struct p54_common, 347 work.work); 348 349 if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED)) 350 return ; 351 352 /* 353 * TODO: walk through tx_queue and do the following tasks 354 * 1. initiate bursts. 355 * 2. cancel stuck frames / reset the device if necessary. 356 */ 357 358 p54_fetch_statistics(priv); 359} 360 361static int p54_get_stats(struct ieee80211_hw *dev, 362 struct ieee80211_low_level_stats *stats) 363{ 364 struct p54_common *priv = dev->priv; 365 366 memcpy(stats, &priv->stats, sizeof(*stats)); 367 return 0; 368} 369 370static void p54_bss_info_changed(struct ieee80211_hw *dev, 371 struct ieee80211_vif *vif, 372 struct ieee80211_bss_conf *info, 373 u32 changed) 374{ 375 struct p54_common *priv = dev->priv; 376 377 mutex_lock(&priv->conf_mutex); 378 if (changed & BSS_CHANGED_BSSID) { 379 memcpy(priv->bssid, info->bssid, ETH_ALEN); 380 p54_setup_mac(priv); 381 } 382 383 if (changed & BSS_CHANGED_BEACON) { 384 p54_scan(priv, P54_SCAN_EXIT, 0); 385 p54_setup_mac(priv); 386 p54_beacon_update(priv, vif); 387 p54_set_edcf(priv); 388 } 389 390 if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) { 391 priv->use_short_slot = info->use_short_slot; 392 p54_set_edcf(priv); 393 } 394 if (changed & BSS_CHANGED_BASIC_RATES) { 395 if (dev->conf.channel->band == IEEE80211_BAND_5GHZ) 396 priv->basic_rate_mask = (info->basic_rates << 4); 397 else 398 priv->basic_rate_mask = info->basic_rates; 399 p54_setup_mac(priv); 400 if (priv->fw_var >= 0x500) 401 p54_scan(priv, P54_SCAN_EXIT, 0); 402 } 403 if (changed & BSS_CHANGED_ASSOC) { 404 if (info->assoc) { 405 priv->aid = info->aid; 406 priv->wakeup_timer = info->beacon_int * 407 info->dtim_period * 5; 408 p54_setup_mac(priv); 409 } else { 410 priv->wakeup_timer = 500; 411 priv->aid = 0; 412 } 413 } 414 415 mutex_unlock(&priv->conf_mutex); 416} 417 418static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd, 419 struct ieee80211_vif *vif, struct ieee80211_sta *sta, 420 struct ieee80211_key_conf *key) 421{ 422 struct p54_common *priv = dev->priv; 423 int slot, ret = 0; 424 u8 algo = 0; 425 u8 *addr = NULL; 426 427 if (modparam_nohwcrypt) 428 return -EOPNOTSUPP; 429 430 mutex_lock(&priv->conf_mutex); 431 if (cmd == SET_KEY) { 432 switch (key->alg) { 433 case ALG_TKIP: 434 if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL | 435 BR_DESC_PRIV_CAP_TKIP))) { 436 ret = -EOPNOTSUPP; 437 goto out_unlock; 438 } 439 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV; 440 algo = P54_CRYPTO_TKIPMICHAEL; 441 break; 442 case ALG_WEP: 443 if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) { 444 ret = -EOPNOTSUPP; 445 goto out_unlock; 446 } 447 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV; 448 algo = P54_CRYPTO_WEP; 449 break; 450 case ALG_CCMP: 451 if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) { 452 ret = -EOPNOTSUPP; 453 goto out_unlock; 454 } 455 key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV; 456 algo = P54_CRYPTO_AESCCMP; 457 break; 458 default: 459 ret = -EOPNOTSUPP; 460 goto out_unlock; 461 } 462 slot = bitmap_find_free_region(priv->used_rxkeys, 463 priv->rx_keycache_size, 0); 464 465 if (slot < 0) { 466 /* 467 * The device supports the choosen algorithm, but the 468 * firmware does not provide enough key slots to store 469 * all of them. 470 * But encryption offload for outgoing frames is always 471 * possible, so we just pretend that the upload was 472 * successful and do the decryption in software. 473 */ 474 475 /* mark the key as invalid. */ 476 key->hw_key_idx = 0xff; 477 goto out_unlock; 478 } 479 } else { 480 slot = key->hw_key_idx; 481 482 if (slot == 0xff) { 483 /* This key was not uploaded into the rx key cache. */ 484 485 goto out_unlock; 486 } 487 488 bitmap_release_region(priv->used_rxkeys, slot, 0); 489 algo = 0; 490 } 491 492 if (sta) 493 addr = sta->addr; 494 495 ret = p54_upload_key(priv, algo, slot, key->keyidx, 496 key->keylen, addr, key->key); 497 if (ret) { 498 bitmap_release_region(priv->used_rxkeys, slot, 0); 499 ret = -EOPNOTSUPP; 500 goto out_unlock; 501 } 502 503 key->hw_key_idx = slot; 504 505out_unlock: 506 mutex_unlock(&priv->conf_mutex); 507 return ret; 508} 509 510static int p54_get_survey(struct ieee80211_hw *dev, int idx, 511 struct survey_info *survey) 512{ 513 struct p54_common *priv = dev->priv; 514 struct ieee80211_conf *conf = &dev->conf; 515 516 if (idx != 0) 517 return -ENOENT; 518 519 survey->channel = conf->channel; 520 survey->filled = SURVEY_INFO_NOISE_DBM; 521 survey->noise = clamp_t(s8, priv->noise, -128, 127); 522 523 return 0; 524} 525 526static const struct ieee80211_ops p54_ops = { 527 .tx = p54_tx_80211, 528 .start = p54_start, 529 .stop = p54_stop, 530 .add_interface = p54_add_interface, 531 .remove_interface = p54_remove_interface, 532 .set_tim = p54_set_tim, 533 .sta_notify = p54_sta_notify, 534 .sta_add = p54_sta_add_remove, 535 .sta_remove = p54_sta_add_remove, 536 .set_key = p54_set_key, 537 .config = p54_config, 538 .bss_info_changed = p54_bss_info_changed, 539 .configure_filter = p54_configure_filter, 540 .conf_tx = p54_conf_tx, 541 .get_stats = p54_get_stats, 542 .get_survey = p54_get_survey, 543}; 544 545struct ieee80211_hw *p54_init_common(size_t priv_data_len) 546{ 547 struct ieee80211_hw *dev; 548 struct p54_common *priv; 549 550 dev = ieee80211_alloc_hw(priv_data_len, &p54_ops); 551 if (!dev) 552 return NULL; 553 554 priv = dev->priv; 555 priv->hw = dev; 556 priv->mode = NL80211_IFTYPE_UNSPECIFIED; 557 priv->basic_rate_mask = 0x15f; 558 spin_lock_init(&priv->tx_stats_lock); 559 skb_queue_head_init(&priv->tx_queue); 560 skb_queue_head_init(&priv->tx_pending); 561 dev->flags = IEEE80211_HW_RX_INCLUDES_FCS | 562 IEEE80211_HW_SIGNAL_DBM | 563 IEEE80211_HW_SUPPORTS_PS | 564 IEEE80211_HW_PS_NULLFUNC_STACK | 565 IEEE80211_HW_BEACON_FILTER | 566 IEEE80211_HW_REPORTS_TX_ACK_STATUS; 567 568 dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) | 569 BIT(NL80211_IFTYPE_ADHOC) | 570 BIT(NL80211_IFTYPE_AP) | 571 BIT(NL80211_IFTYPE_MESH_POINT); 572 573 dev->channel_change_time = 1000; /* TODO: find actual value */ 574 priv->beacon_req_id = cpu_to_le32(0); 575 priv->tx_stats[P54_QUEUE_BEACON].limit = 1; 576 priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1; 577 priv->tx_stats[P54_QUEUE_MGMT].limit = 3; 578 priv->tx_stats[P54_QUEUE_CAB].limit = 3; 579 priv->tx_stats[P54_QUEUE_DATA].limit = 5; 580 dev->queues = 1; 581 priv->noise = -94; 582 /* 583 * We support at most 8 tries no matter which rate they're at, 584 * we cannot support max_rates * max_rate_tries as we set it 585 * here, but setting it correctly to 4/2 or so would limit us 586 * artificially if the RC algorithm wants just two rates, so 587 * let's say 4/7, we'll redistribute it at TX time, see the 588 * comments there. 589 */ 590 dev->max_rates = 4; 591 dev->max_rate_tries = 7; 592 dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 + 593 sizeof(struct p54_tx_data); 594 595 /* 596 * For now, disable PS by default because it affects 597 * link stability significantly. 598 */ 599 dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT; 600 601 mutex_init(&priv->conf_mutex); 602 mutex_init(&priv->eeprom_mutex); 603 init_completion(&priv->eeprom_comp); 604 init_completion(&priv->beacon_comp); 605 INIT_DELAYED_WORK(&priv->work, p54_work); 606 607 return dev; 608} 609EXPORT_SYMBOL_GPL(p54_init_common); 610 611int p54_register_common(struct ieee80211_hw *dev, struct device *pdev) 612{ 613 struct p54_common *priv = dev->priv; 614 int err; 615 616 err = ieee80211_register_hw(dev); 617 if (err) { 618 dev_err(pdev, "Cannot register device (%d).\n", err); 619 return err; 620 } 621 622#ifdef CONFIG_P54_LEDS 623 err = p54_init_leds(priv); 624 if (err) 625 return err; 626#endif /* CONFIG_P54_LEDS */ 627 628 dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy)); 629 return 0; 630} 631EXPORT_SYMBOL_GPL(p54_register_common); 632 633void p54_free_common(struct ieee80211_hw *dev) 634{ 635 struct p54_common *priv = dev->priv; 636 unsigned int i; 637 638 for (i = 0; i < IEEE80211_NUM_BANDS; i++) 639 kfree(priv->band_table[i]); 640 641 kfree(priv->iq_autocal); 642 kfree(priv->output_limit); 643 kfree(priv->curve_data); 644 kfree(priv->used_rxkeys); 645 priv->iq_autocal = NULL; 646 priv->output_limit = NULL; 647 priv->curve_data = NULL; 648 priv->used_rxkeys = NULL; 649 ieee80211_free_hw(dev); 650} 651EXPORT_SYMBOL_GPL(p54_free_common); 652 653void p54_unregister_common(struct ieee80211_hw *dev) 654{ 655 struct p54_common *priv = dev->priv; 656 657#ifdef CONFIG_P54_LEDS 658 p54_unregister_leds(priv); 659#endif /* CONFIG_P54_LEDS */ 660 661 ieee80211_unregister_hw(dev); 662 mutex_destroy(&priv->conf_mutex); 663 mutex_destroy(&priv->eeprom_mutex); 664} 665EXPORT_SYMBOL_GPL(p54_unregister_common); 666