1 /*-
2  * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
3  * Copyright (c) 2004-2005 Atheros Communications, Inc.
4  * Copyright (c) 2006 Devicescape Software, Inc.
5  * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
6  * Copyright (c) 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
7  * Copyright (c) 2010 Bruno Randolf <br1@einfach.org>
8  *
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
19  *    redistribution must be conditioned upon including a substantially
20  *    similar Disclaimer requirement for further binary redistribution.
21  * 3. Neither the names of the above-listed copyright holders nor the names
22  *    of any contributors may be used to endorse or promote products derived
23  *    from this software without specific prior written permission.
24  *
25  * Alternatively, this software may be distributed under the terms of the
26  * GNU General Public License ("GPL") version 2 as published by the Free
27  * Software Foundation.
28  *
29  * NO WARRANTY
30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
33  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
34  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
35  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
36  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
37  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
38  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
40  * THE POSSIBILITY OF SUCH DAMAGES.
41  *
42  */
43 
44 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
45 
46 #include <net/mac80211.h>
47 #include <asm/unaligned.h>
48 
49 #include "ath5k.h"
50 #include "base.h"
51 #include "reg.h"
52 
53 /********************\
54 * Mac80211 functions *
55 \********************/
56 
57 static void
58 ath5k_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control,
59 	 struct sk_buff *skb)
60 {
61 	struct ath5k_hw *ah = hw->priv;
62 	u16 qnum = skb_get_queue_mapping(skb);
63 
64 	if (WARN_ON(qnum >= ah->ah_capabilities.cap_queues.q_tx_num)) {
65 		ieee80211_free_txskb(hw, skb);
66 		return;
67 	}
68 
69 	ath5k_tx_queue(hw, skb, &ah->txqs[qnum], control);
70 }
71 
72 
73 static int
74 ath5k_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
75 {
76 	struct ath5k_hw *ah = hw->priv;
77 	int ret;
78 	struct ath5k_vif *avf = (void *)vif->drv_priv;
79 
80 	mutex_lock(&ah->lock);
81 
82 	if ((vif->type == NL80211_IFTYPE_AP ||
83 	     vif->type == NL80211_IFTYPE_ADHOC)
84 	    && (ah->num_ap_vifs + ah->num_adhoc_vifs) >= ATH_BCBUF) {
85 		ret = -ELNRNG;
86 		goto end;
87 	}
88 
89 	/* Don't allow other interfaces if one ad-hoc is configured.
90 	 * TODO: Fix the problems with ad-hoc and multiple other interfaces.
91 	 * We would need to operate the HW in ad-hoc mode to allow TSF updates
92 	 * for the IBSS, but this breaks with additional AP or STA interfaces
93 	 * at the moment. */
94 	if (ah->num_adhoc_vifs ||
95 	    (ah->nvifs && vif->type == NL80211_IFTYPE_ADHOC)) {
96 		ATH5K_ERR(ah, "Only one single ad-hoc interface is allowed.\n");
97 		ret = -ELNRNG;
98 		goto end;
99 	}
100 
101 	switch (vif->type) {
102 	case NL80211_IFTYPE_AP:
103 	case NL80211_IFTYPE_STATION:
104 	case NL80211_IFTYPE_ADHOC:
105 	case NL80211_IFTYPE_MESH_POINT:
106 		avf->opmode = vif->type;
107 		break;
108 	default:
109 		ret = -EOPNOTSUPP;
110 		goto end;
111 	}
112 
113 	ah->nvifs++;
114 	ATH5K_DBG(ah, ATH5K_DEBUG_MODE, "add interface mode %d\n", avf->opmode);
115 
116 	/* Assign the vap/adhoc to a beacon xmit slot. */
117 	if ((avf->opmode == NL80211_IFTYPE_AP) ||
118 	    (avf->opmode == NL80211_IFTYPE_ADHOC) ||
119 	    (avf->opmode == NL80211_IFTYPE_MESH_POINT)) {
120 		int slot;
121 
122 		WARN_ON(list_empty(&ah->bcbuf));
123 		avf->bbuf = list_first_entry(&ah->bcbuf, struct ath5k_buf,
124 					     list);
125 		list_del(&avf->bbuf->list);
126 
127 		avf->bslot = 0;
128 		for (slot = 0; slot < ATH_BCBUF; slot++) {
129 			if (!ah->bslot[slot]) {
130 				avf->bslot = slot;
131 				break;
132 			}
133 		}
134 		BUG_ON(ah->bslot[avf->bslot] != NULL);
135 		ah->bslot[avf->bslot] = vif;
136 		if (avf->opmode == NL80211_IFTYPE_AP)
137 			ah->num_ap_vifs++;
138 		else if (avf->opmode == NL80211_IFTYPE_ADHOC)
139 			ah->num_adhoc_vifs++;
140 		else if (avf->opmode == NL80211_IFTYPE_MESH_POINT)
141 			ah->num_mesh_vifs++;
142 	}
143 
144 	/* Any MAC address is fine, all others are included through the
145 	 * filter.
146 	 */
147 	ath5k_hw_set_lladdr(ah, vif->addr);
148 
149 	ath5k_update_bssid_mask_and_opmode(ah, vif);
150 	ret = 0;
151 end:
152 	mutex_unlock(&ah->lock);
153 	return ret;
154 }
155 
156 
157 static void
158 ath5k_remove_interface(struct ieee80211_hw *hw,
159 		       struct ieee80211_vif *vif)
160 {
161 	struct ath5k_hw *ah = hw->priv;
162 	struct ath5k_vif *avf = (void *)vif->drv_priv;
163 	unsigned int i;
164 
165 	mutex_lock(&ah->lock);
166 	ah->nvifs--;
167 
168 	if (avf->bbuf) {
169 		ath5k_txbuf_free_skb(ah, avf->bbuf);
170 		list_add_tail(&avf->bbuf->list, &ah->bcbuf);
171 		for (i = 0; i < ATH_BCBUF; i++) {
172 			if (ah->bslot[i] == vif) {
173 				ah->bslot[i] = NULL;
174 				break;
175 			}
176 		}
177 		avf->bbuf = NULL;
178 	}
179 	if (avf->opmode == NL80211_IFTYPE_AP)
180 		ah->num_ap_vifs--;
181 	else if (avf->opmode == NL80211_IFTYPE_ADHOC)
182 		ah->num_adhoc_vifs--;
183 	else if (avf->opmode == NL80211_IFTYPE_MESH_POINT)
184 		ah->num_mesh_vifs--;
185 
186 	ath5k_update_bssid_mask_and_opmode(ah, NULL);
187 	mutex_unlock(&ah->lock);
188 }
189 
190 
191 /*
192  * TODO: Phy disable/diversity etc
193  */
194 static int
195 ath5k_config(struct ieee80211_hw *hw, u32 changed)
196 {
197 	struct ath5k_hw *ah = hw->priv;
198 	struct ieee80211_conf *conf = &hw->conf;
199 	int ret = 0;
200 	int i;
201 
202 	mutex_lock(&ah->lock);
203 
204 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
205 		ret = ath5k_chan_set(ah, &conf->chandef);
206 		if (ret < 0)
207 			goto unlock;
208 	}
209 
210 	if ((changed & IEEE80211_CONF_CHANGE_POWER) &&
211 	(ah->ah_txpower.txp_requested != conf->power_level)) {
212 		ah->ah_txpower.txp_requested = conf->power_level;
213 
214 		/* Half dB steps */
215 		ath5k_hw_set_txpower_limit(ah, (conf->power_level * 2));
216 	}
217 
218 	if (changed & IEEE80211_CONF_CHANGE_RETRY_LIMITS) {
219 		ah->ah_retry_long = conf->long_frame_max_tx_count;
220 		ah->ah_retry_short = conf->short_frame_max_tx_count;
221 
222 		for (i = 0; i < ah->ah_capabilities.cap_queues.q_tx_num; i++)
223 			ath5k_hw_set_tx_retry_limits(ah, i);
224 	}
225 
226 	/* TODO:
227 	 * 1) Move this on config_interface and handle each case
228 	 * separately eg. when we have only one STA vif, use
229 	 * AR5K_ANTMODE_SINGLE_AP
230 	 *
231 	 * 2) Allow the user to change antenna mode eg. when only
232 	 * one antenna is present
233 	 *
234 	 * 3) Allow the user to set default/tx antenna when possible
235 	 *
236 	 * 4) Default mode should handle 90% of the cases, together
237 	 * with fixed a/b and single AP modes we should be able to
238 	 * handle 99%. Sectored modes are extreme cases and i still
239 	 * haven't found a usage for them. If we decide to support them,
240 	 * then we must allow the user to set how many tx antennas we
241 	 * have available
242 	 */
243 	ath5k_hw_set_antenna_mode(ah, ah->ah_ant_mode);
244 
245 unlock:
246 	mutex_unlock(&ah->lock);
247 	return ret;
248 }
249 
250 
251 static void
252 ath5k_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
253 		       struct ieee80211_bss_conf *bss_conf, u64 changes)
254 {
255 	struct ath5k_vif *avf = (void *)vif->drv_priv;
256 	struct ath5k_hw *ah = hw->priv;
257 	struct ath_common *common = ath5k_hw_common(ah);
258 
259 	mutex_lock(&ah->lock);
260 
261 	if (changes & BSS_CHANGED_BSSID) {
262 		/* Cache for later use during resets */
263 		memcpy(common->curbssid, bss_conf->bssid, ETH_ALEN);
264 		common->curaid = 0;
265 		ath5k_hw_set_bssid(ah);
266 	}
267 
268 	if (changes & BSS_CHANGED_BEACON_INT)
269 		ah->bintval = bss_conf->beacon_int;
270 
271 	if (changes & BSS_CHANGED_ERP_SLOT) {
272 		int slot_time;
273 
274 		ah->ah_short_slot = bss_conf->use_short_slot;
275 		slot_time = ath5k_hw_get_default_slottime(ah) +
276 			    3 * ah->ah_coverage_class;
277 		ath5k_hw_set_ifs_intervals(ah, slot_time);
278 	}
279 
280 	if (changes & BSS_CHANGED_ASSOC) {
281 		avf->assoc = vif->cfg.assoc;
282 		if (vif->cfg.assoc)
283 			ah->assoc = vif->cfg.assoc;
284 		else
285 			ah->assoc = ath5k_any_vif_assoc(ah);
286 
287 		if (ah->opmode == NL80211_IFTYPE_STATION)
288 			ath5k_set_beacon_filter(hw, ah->assoc);
289 		ath5k_hw_set_ledstate(ah, ah->assoc ?
290 			AR5K_LED_ASSOC : AR5K_LED_INIT);
291 		if (vif->cfg.assoc) {
292 			ATH5K_DBG(ah, ATH5K_DEBUG_ANY,
293 				  "Bss Info ASSOC %d, bssid: %pM\n",
294 				  vif->cfg.aid, common->curbssid);
295 			common->curaid = vif->cfg.aid;
296 			ath5k_hw_set_bssid(ah);
297 			/* Once ANI is available you would start it here */
298 		}
299 	}
300 
301 	if (changes & BSS_CHANGED_BEACON) {
302 		spin_lock_bh(&ah->block);
303 		ath5k_beacon_update(hw, vif);
304 		spin_unlock_bh(&ah->block);
305 	}
306 
307 	if (changes & BSS_CHANGED_BEACON_ENABLED)
308 		ah->enable_beacon = bss_conf->enable_beacon;
309 
310 	if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_ENABLED |
311 		       BSS_CHANGED_BEACON_INT))
312 		ath5k_beacon_config(ah);
313 
314 	mutex_unlock(&ah->lock);
315 }
316 
317 
318 static u64
319 ath5k_prepare_multicast(struct ieee80211_hw *hw,
320 			struct netdev_hw_addr_list *mc_list)
321 {
322 	u32 mfilt[2], val;
323 	u8 pos;
324 	struct netdev_hw_addr *ha;
325 
326 	mfilt[0] = 0;
327 	mfilt[1] = 0;
328 
329 	netdev_hw_addr_list_for_each(ha, mc_list) {
330 		/* calculate XOR of eight 6-bit values */
331 		val = get_unaligned_le32(ha->addr + 0);
332 		pos = (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
333 		val = get_unaligned_le32(ha->addr + 3);
334 		pos ^= (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
335 		pos &= 0x3f;
336 		mfilt[pos / 32] |= (1 << (pos % 32));
337 		/* XXX: we might be able to just do this instead,
338 		* but not sure, needs testing, if we do use this we'd
339 		* need to inform below not to reset the mcast */
340 		/* ath5k_hw_set_mcast_filterindex(ah,
341 		 *      ha->addr[5]); */
342 	}
343 
344 	return ((u64)(mfilt[1]) << 32) | mfilt[0];
345 }
346 
347 
348 /*
349  * o always accept unicast, broadcast, and multicast traffic
350  * o multicast traffic for all BSSIDs will be enabled if mac80211
351  *   says it should be
352  * o maintain current state of phy ofdm or phy cck error reception.
353  *   If the hardware detects any of these type of errors then
354  *   ath5k_hw_get_rx_filter() will pass to us the respective
355  *   hardware filters to be able to receive these type of frames.
356  * o probe request frames are accepted only when operating in
357  *   hostap, adhoc, or monitor modes
358  * o enable promiscuous mode according to the interface state
359  * o accept beacons:
360  *   - when operating in adhoc mode so the 802.11 layer creates
361  *     node table entries for peers,
362  *   - when operating in station mode for collecting rssi data when
363  *     the station is otherwise quiet, or
364  *   - when scanning
365  */
366 static void
367 ath5k_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,
368 		       unsigned int *new_flags, u64 multicast)
369 {
370 #define SUPPORTED_FIF_FLAGS \
371 	(FIF_ALLMULTI | FIF_FCSFAIL | \
372 	FIF_PLCPFAIL | FIF_CONTROL | FIF_OTHER_BSS | \
373 	FIF_BCN_PRBRESP_PROMISC)
374 
375 	struct ath5k_hw *ah = hw->priv;
376 	u32 mfilt[2], rfilt;
377 	struct ath5k_vif_iter_data iter_data; /* to count STA interfaces */
378 
379 	mutex_lock(&ah->lock);
380 
381 	mfilt[0] = multicast;
382 	mfilt[1] = multicast >> 32;
383 
384 	/* Only deal with supported flags */
385 	changed_flags &= SUPPORTED_FIF_FLAGS;
386 	*new_flags &= SUPPORTED_FIF_FLAGS;
387 
388 	/* If HW detects any phy or radar errors, leave those filters on.
389 	 * Also, always enable Unicast, Broadcasts and Multicast
390 	 * XXX: move unicast, bssid broadcasts and multicast to mac80211 */
391 	rfilt = (ath5k_hw_get_rx_filter(ah) & (AR5K_RX_FILTER_PHYERR)) |
392 		(AR5K_RX_FILTER_UCAST | AR5K_RX_FILTER_BCAST |
393 		AR5K_RX_FILTER_MCAST);
394 
395 	/* Note, AR5K_RX_FILTER_MCAST is already enabled */
396 	if (*new_flags & FIF_ALLMULTI) {
397 		mfilt[0] =  ~0;
398 		mfilt[1] =  ~0;
399 	}
400 
401 	/* This is the best we can do */
402 	if (*new_flags & (FIF_FCSFAIL | FIF_PLCPFAIL))
403 		rfilt |= AR5K_RX_FILTER_PHYERR;
404 
405 	/* FIF_BCN_PRBRESP_PROMISC really means to enable beacons
406 	* and probes for any BSSID */
407 	if ((*new_flags & FIF_BCN_PRBRESP_PROMISC) || (ah->nvifs > 1))
408 		rfilt |= AR5K_RX_FILTER_BEACON;
409 
410 	/* FIF_CONTROL doc says we should only pass on control frames for this
411 	 * station. This needs testing. I believe right now this
412 	 * enables *all* control frames, which is OK.. but
413 	 * we should see if we can improve on granularity */
414 	if (*new_flags & FIF_CONTROL)
415 		rfilt |= AR5K_RX_FILTER_CONTROL;
416 
417 	/* Additional settings per mode -- this is per ath5k */
418 
419 	/* XXX move these to mac80211, and add a beacon IFF flag to mac80211 */
420 
421 	switch (ah->opmode) {
422 	case NL80211_IFTYPE_MESH_POINT:
423 		rfilt |= AR5K_RX_FILTER_CONTROL |
424 			 AR5K_RX_FILTER_BEACON |
425 			 AR5K_RX_FILTER_PROBEREQ |
426 			 AR5K_RX_FILTER_PROM;
427 		break;
428 	case NL80211_IFTYPE_AP:
429 	case NL80211_IFTYPE_ADHOC:
430 		rfilt |= AR5K_RX_FILTER_PROBEREQ |
431 			 AR5K_RX_FILTER_BEACON;
432 		break;
433 	case NL80211_IFTYPE_STATION:
434 		if (ah->assoc)
435 			rfilt |= AR5K_RX_FILTER_BEACON;
436 		break;
437 	default:
438 		break;
439 	}
440 
441 	iter_data.hw_macaddr = NULL;
442 	iter_data.n_stas = 0;
443 	iter_data.need_set_hw_addr = false;
444 	ieee80211_iterate_active_interfaces_atomic(
445 		ah->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
446 		ath5k_vif_iter, &iter_data);
447 
448 	/* Set up RX Filter */
449 	if (iter_data.n_stas > 1) {
450 		/* If you have multiple STA interfaces connected to
451 		 * different APs, ARPs are not received (most of the time?)
452 		 * Enabling PROMISC appears to fix that problem.
453 		 */
454 		rfilt |= AR5K_RX_FILTER_PROM;
455 	}
456 
457 	/* Set filters */
458 	ath5k_hw_set_rx_filter(ah, rfilt);
459 
460 	/* Set multicast bits */
461 	ath5k_hw_set_mcast_filter(ah, mfilt[0], mfilt[1]);
462 	/* Set the cached hw filter flags, this will later actually
463 	 * be set in HW */
464 	ah->filter_flags = rfilt;
465 	/* Store current FIF filter flags */
466 	ah->fif_filter_flags = *new_flags;
467 
468 	mutex_unlock(&ah->lock);
469 }
470 
471 
472 static int
473 ath5k_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
474 	      struct ieee80211_vif *vif, struct ieee80211_sta *sta,
475 	      struct ieee80211_key_conf *key)
476 {
477 	struct ath5k_hw *ah = hw->priv;
478 	struct ath_common *common = ath5k_hw_common(ah);
479 	int ret = 0;
480 
481 	if (ath5k_modparam_nohwcrypt)
482 		return -EOPNOTSUPP;
483 
484 	if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT)
485 		return -EOPNOTSUPP;
486 
487 	if (vif->type == NL80211_IFTYPE_ADHOC &&
488 	    (key->cipher == WLAN_CIPHER_SUITE_TKIP ||
489 	     key->cipher == WLAN_CIPHER_SUITE_CCMP) &&
490 	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
491 		/* don't program group keys when using IBSS_RSN */
492 		return -EOPNOTSUPP;
493 	}
494 
495 	switch (key->cipher) {
496 	case WLAN_CIPHER_SUITE_WEP40:
497 	case WLAN_CIPHER_SUITE_WEP104:
498 	case WLAN_CIPHER_SUITE_TKIP:
499 		break;
500 	case WLAN_CIPHER_SUITE_CCMP:
501 		if (common->crypt_caps & ATH_CRYPT_CAP_CIPHER_AESCCM)
502 			break;
503 		return -EOPNOTSUPP;
504 	default:
505 		return -EOPNOTSUPP;
506 	}
507 
508 	mutex_lock(&ah->lock);
509 
510 	switch (cmd) {
511 	case SET_KEY:
512 		ret = ath_key_config(common, vif, sta, key);
513 		if (ret >= 0) {
514 			key->hw_key_idx = ret;
515 			/* push IV and Michael MIC generation to stack */
516 			key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
517 			if (key->cipher == WLAN_CIPHER_SUITE_TKIP)
518 				key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
519 			if (key->cipher == WLAN_CIPHER_SUITE_CCMP)
520 				key->flags |= IEEE80211_KEY_FLAG_SW_MGMT_TX;
521 			ret = 0;
522 		}
523 		break;
524 	case DISABLE_KEY:
525 		ath_key_delete(common, key->hw_key_idx);
526 		break;
527 	default:
528 		ret = -EINVAL;
529 	}
530 
531 	mutex_unlock(&ah->lock);
532 	return ret;
533 }
534 
535 
536 static void
537 ath5k_sw_scan_start(struct ieee80211_hw *hw,
538 		    struct ieee80211_vif *vif,
539 		    const u8 *mac_addr)
540 {
541 	struct ath5k_hw *ah = hw->priv;
542 	if (!ah->assoc)
543 		ath5k_hw_set_ledstate(ah, AR5K_LED_SCAN);
544 }
545 
546 
547 static void
548 ath5k_sw_scan_complete(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
549 {
550 	struct ath5k_hw *ah = hw->priv;
551 	ath5k_hw_set_ledstate(ah, ah->assoc ?
552 		AR5K_LED_ASSOC : AR5K_LED_INIT);
553 }
554 
555 
556 static int
557 ath5k_get_stats(struct ieee80211_hw *hw,
558 		struct ieee80211_low_level_stats *stats)
559 {
560 	struct ath5k_hw *ah = hw->priv;
561 
562 	/* Force update */
563 	ath5k_hw_update_mib_counters(ah);
564 
565 	stats->dot11ACKFailureCount = ah->stats.ack_fail;
566 	stats->dot11RTSFailureCount = ah->stats.rts_fail;
567 	stats->dot11RTSSuccessCount = ah->stats.rts_ok;
568 	stats->dot11FCSErrorCount = ah->stats.fcs_error;
569 
570 	return 0;
571 }
572 
573 
574 static int
575 ath5k_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
576 	      unsigned int link_id, u16 queue,
577 	      const struct ieee80211_tx_queue_params *params)
578 {
579 	struct ath5k_hw *ah = hw->priv;
580 	struct ath5k_txq_info qi;
581 	int ret = 0;
582 
583 	if (queue >= ah->ah_capabilities.cap_queues.q_tx_num)
584 		return 0;
585 
586 	mutex_lock(&ah->lock);
587 
588 	ath5k_hw_get_tx_queueprops(ah, queue, &qi);
589 
590 	qi.tqi_aifs = params->aifs;
591 	qi.tqi_cw_min = params->cw_min;
592 	qi.tqi_cw_max = params->cw_max;
593 	qi.tqi_burst_time = params->txop * 32;
594 
595 	ATH5K_DBG(ah, ATH5K_DEBUG_ANY,
596 		  "Configure tx [queue %d],  "
597 		  "aifs: %d, cw_min: %d, cw_max: %d, txop: %d\n",
598 		  queue, params->aifs, params->cw_min,
599 		  params->cw_max, params->txop);
600 
601 	if (ath5k_hw_set_tx_queueprops(ah, queue, &qi)) {
602 		ATH5K_ERR(ah,
603 			  "Unable to update hardware queue %u!\n", queue);
604 		ret = -EIO;
605 	} else
606 		ath5k_hw_reset_tx_queue(ah, queue);
607 
608 	mutex_unlock(&ah->lock);
609 
610 	return ret;
611 }
612 
613 
614 static u64
615 ath5k_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
616 {
617 	struct ath5k_hw *ah = hw->priv;
618 
619 	return ath5k_hw_get_tsf64(ah);
620 }
621 
622 
623 static void
624 ath5k_set_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u64 tsf)
625 {
626 	struct ath5k_hw *ah = hw->priv;
627 
628 	ath5k_hw_set_tsf64(ah, tsf);
629 }
630 
631 
632 static void
633 ath5k_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
634 {
635 	struct ath5k_hw *ah = hw->priv;
636 
637 	/*
638 	 * in IBSS mode we need to update the beacon timers too.
639 	 * this will also reset the TSF if we call it with 0
640 	 */
641 	if (ah->opmode == NL80211_IFTYPE_ADHOC)
642 		ath5k_beacon_update_timers(ah, 0);
643 	else
644 		ath5k_hw_reset_tsf(ah);
645 }
646 
647 
648 static int
649 ath5k_get_survey(struct ieee80211_hw *hw, int idx, struct survey_info *survey)
650 {
651 	struct ath5k_hw *ah = hw->priv;
652 	struct ieee80211_conf *conf = &hw->conf;
653 	struct ath_common *common = ath5k_hw_common(ah);
654 	struct ath_cycle_counters *cc = &common->cc_survey;
655 	unsigned int div = common->clockrate * 1000;
656 
657 	if (idx != 0)
658 		return -ENOENT;
659 
660 	spin_lock_bh(&common->cc_lock);
661 	ath_hw_cycle_counters_update(common);
662 	if (cc->cycles > 0) {
663 		ah->survey.time += cc->cycles / div;
664 		ah->survey.time_busy += cc->rx_busy / div;
665 		ah->survey.time_rx += cc->rx_frame / div;
666 		ah->survey.time_tx += cc->tx_frame / div;
667 	}
668 	memset(cc, 0, sizeof(*cc));
669 	spin_unlock_bh(&common->cc_lock);
670 
671 	memcpy(survey, &ah->survey, sizeof(*survey));
672 
673 	survey->channel = conf->chandef.chan;
674 	survey->noise = ah->ah_noise_floor;
675 	survey->filled = SURVEY_INFO_NOISE_DBM |
676 			SURVEY_INFO_IN_USE |
677 			SURVEY_INFO_TIME |
678 			SURVEY_INFO_TIME_BUSY |
679 			SURVEY_INFO_TIME_RX |
680 			SURVEY_INFO_TIME_TX;
681 
682 	return 0;
683 }
684 
685 
686 /**
687  * ath5k_set_coverage_class - Set IEEE 802.11 coverage class
688  *
689  * @hw: struct ieee80211_hw pointer
690  * @coverage_class: IEEE 802.11 coverage class number
691  *
692  * Mac80211 callback. Sets slot time, ACK timeout and CTS timeout for given
693  * coverage class. The values are persistent, they are restored after device
694  * reset.
695  */
696 static void
697 ath5k_set_coverage_class(struct ieee80211_hw *hw, s16 coverage_class)
698 {
699 	struct ath5k_hw *ah = hw->priv;
700 
701 	mutex_lock(&ah->lock);
702 	ath5k_hw_set_coverage_class(ah, coverage_class);
703 	mutex_unlock(&ah->lock);
704 }
705 
706 
707 static int
708 ath5k_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
709 {
710 	struct ath5k_hw *ah = hw->priv;
711 
712 	if (tx_ant == 1 && rx_ant == 1)
713 		ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_FIXED_A);
714 	else if (tx_ant == 2 && rx_ant == 2)
715 		ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_FIXED_B);
716 	else if ((tx_ant & 3) == 3 && (rx_ant & 3) == 3)
717 		ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_DEFAULT);
718 	else
719 		return -EINVAL;
720 	return 0;
721 }
722 
723 
724 static int
725 ath5k_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
726 {
727 	struct ath5k_hw *ah = hw->priv;
728 
729 	switch (ah->ah_ant_mode) {
730 	case AR5K_ANTMODE_FIXED_A:
731 		*tx_ant = 1; *rx_ant = 1; break;
732 	case AR5K_ANTMODE_FIXED_B:
733 		*tx_ant = 2; *rx_ant = 2; break;
734 	case AR5K_ANTMODE_DEFAULT:
735 		*tx_ant = 3; *rx_ant = 3; break;
736 	}
737 	return 0;
738 }
739 
740 
741 static void ath5k_get_ringparam(struct ieee80211_hw *hw,
742 				u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
743 {
744 	struct ath5k_hw *ah = hw->priv;
745 
746 	*tx = ah->txqs[AR5K_TX_QUEUE_ID_DATA_MIN].txq_max;
747 
748 	*tx_max = ATH5K_TXQ_LEN_MAX;
749 	*rx = *rx_max = ATH_RXBUF;
750 }
751 
752 
753 static int ath5k_set_ringparam(struct ieee80211_hw *hw, u32 tx, u32 rx)
754 {
755 	struct ath5k_hw *ah = hw->priv;
756 	u16 qnum;
757 
758 	/* only support setting tx ring size for now */
759 	if (rx != ATH_RXBUF)
760 		return -EINVAL;
761 
762 	/* restrict tx ring size min/max */
763 	if (!tx || tx > ATH5K_TXQ_LEN_MAX)
764 		return -EINVAL;
765 
766 	for (qnum = 0; qnum < ARRAY_SIZE(ah->txqs); qnum++) {
767 		if (!ah->txqs[qnum].setup)
768 			continue;
769 		if (ah->txqs[qnum].qnum < AR5K_TX_QUEUE_ID_DATA_MIN ||
770 		    ah->txqs[qnum].qnum > AR5K_TX_QUEUE_ID_DATA_MAX)
771 			continue;
772 
773 		ah->txqs[qnum].txq_max = tx;
774 		if (ah->txqs[qnum].txq_len >= ah->txqs[qnum].txq_max)
775 			ieee80211_stop_queue(hw, ah->txqs[qnum].qnum);
776 	}
777 
778 	return 0;
779 }
780 
781 
782 const struct ieee80211_ops ath5k_hw_ops = {
783 	.tx			= ath5k_tx,
784 	.start			= ath5k_start,
785 	.stop			= ath5k_stop,
786 	.add_interface		= ath5k_add_interface,
787 	/* .change_interface	= not implemented */
788 	.remove_interface	= ath5k_remove_interface,
789 	.config			= ath5k_config,
790 	.bss_info_changed	= ath5k_bss_info_changed,
791 	.prepare_multicast	= ath5k_prepare_multicast,
792 	.configure_filter	= ath5k_configure_filter,
793 	/* .set_tim		= not implemented */
794 	.set_key		= ath5k_set_key,
795 	/* .update_tkip_key	= not implemented */
796 	/* .hw_scan		= not implemented */
797 	.sw_scan_start		= ath5k_sw_scan_start,
798 	.sw_scan_complete	= ath5k_sw_scan_complete,
799 	.get_stats		= ath5k_get_stats,
800 	/* .set_frag_threshold	= not implemented */
801 	/* .set_rts_threshold	= not implemented */
802 	/* .sta_add		= not implemented */
803 	/* .sta_remove		= not implemented */
804 	/* .sta_notify		= not implemented */
805 	.conf_tx		= ath5k_conf_tx,
806 	.get_tsf		= ath5k_get_tsf,
807 	.set_tsf		= ath5k_set_tsf,
808 	.reset_tsf		= ath5k_reset_tsf,
809 	/* .tx_last_beacon	= not implemented */
810 	/* .ampdu_action	= not needed */
811 	.get_survey		= ath5k_get_survey,
812 	.set_coverage_class	= ath5k_set_coverage_class,
813 	/* .rfkill_poll		= not implemented */
814 	/* .flush		= not implemented */
815 	/* .channel_switch	= not implemented */
816 	/* .napi_poll		= not implemented */
817 	.set_antenna		= ath5k_set_antenna,
818 	.get_antenna		= ath5k_get_antenna,
819 	.set_ringparam		= ath5k_set_ringparam,
820 	.get_ringparam		= ath5k_get_ringparam,
821 };
822