1 /*
2 Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
3 Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
4 <http://rt2x00.serialmonkey.com>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /*
21 Module: rt2x00lib
22 Abstract: rt2x00 generic device routines.
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/log2.h>
29
30 #include "rt2x00.h"
31 #include "rt2x00lib.h"
32
33 /*
34 * Utility functions.
35 */
rt2x00lib_get_bssidx(struct rt2x00_dev * rt2x00dev,struct ieee80211_vif * vif)36 u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev,
37 struct ieee80211_vif *vif)
38 {
39 /*
40 * When in STA mode, bssidx is always 0 otherwise local_address[5]
41 * contains the bss number, see BSS_ID_MASK comments for details.
42 */
43 if (rt2x00dev->intf_sta_count)
44 return 0;
45 return vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
46 }
47 EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx);
48
49 /*
50 * Radio control handlers.
51 */
rt2x00lib_enable_radio(struct rt2x00_dev * rt2x00dev)52 int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
53 {
54 int status;
55
56 /*
57 * Don't enable the radio twice.
58 * And check if the hardware button has been disabled.
59 */
60 if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
61 return 0;
62
63 /*
64 * Initialize all data queues.
65 */
66 rt2x00queue_init_queues(rt2x00dev);
67
68 /*
69 * Enable radio.
70 */
71 status =
72 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
73 if (status)
74 return status;
75
76 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
77
78 rt2x00leds_led_radio(rt2x00dev, true);
79 rt2x00led_led_activity(rt2x00dev, true);
80
81 set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
82
83 /*
84 * Enable queues.
85 */
86 rt2x00queue_start_queues(rt2x00dev);
87 rt2x00link_start_tuner(rt2x00dev);
88 rt2x00link_start_agc(rt2x00dev);
89 if (rt2x00_has_cap_vco_recalibration(rt2x00dev))
90 rt2x00link_start_vcocal(rt2x00dev);
91
92 /*
93 * Start watchdog monitoring.
94 */
95 rt2x00link_start_watchdog(rt2x00dev);
96
97 return 0;
98 }
99
rt2x00lib_disable_radio(struct rt2x00_dev * rt2x00dev)100 void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
101 {
102 if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
103 return;
104
105 /*
106 * Stop watchdog monitoring.
107 */
108 rt2x00link_stop_watchdog(rt2x00dev);
109
110 /*
111 * Stop all queues
112 */
113 rt2x00link_stop_agc(rt2x00dev);
114 if (rt2x00_has_cap_vco_recalibration(rt2x00dev))
115 rt2x00link_stop_vcocal(rt2x00dev);
116 rt2x00link_stop_tuner(rt2x00dev);
117 rt2x00queue_stop_queues(rt2x00dev);
118 rt2x00queue_flush_queues(rt2x00dev, true);
119
120 /*
121 * Disable radio.
122 */
123 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
124 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
125 rt2x00led_led_activity(rt2x00dev, false);
126 rt2x00leds_led_radio(rt2x00dev, false);
127 }
128
rt2x00lib_intf_scheduled_iter(void * data,u8 * mac,struct ieee80211_vif * vif)129 static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
130 struct ieee80211_vif *vif)
131 {
132 struct rt2x00_dev *rt2x00dev = data;
133 struct rt2x00_intf *intf = vif_to_intf(vif);
134
135 /*
136 * It is possible the radio was disabled while the work had been
137 * scheduled. If that happens we should return here immediately,
138 * note that in the spinlock protected area above the delayed_flags
139 * have been cleared correctly.
140 */
141 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
142 return;
143
144 if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags)) {
145 mutex_lock(&intf->beacon_skb_mutex);
146 rt2x00queue_update_beacon(rt2x00dev, vif);
147 mutex_unlock(&intf->beacon_skb_mutex);
148 }
149 }
150
rt2x00lib_intf_scheduled(struct work_struct * work)151 static void rt2x00lib_intf_scheduled(struct work_struct *work)
152 {
153 struct rt2x00_dev *rt2x00dev =
154 container_of(work, struct rt2x00_dev, intf_work);
155
156 /*
157 * Iterate over each interface and perform the
158 * requested configurations.
159 */
160 ieee80211_iterate_active_interfaces(rt2x00dev->hw,
161 IEEE80211_IFACE_ITER_RESUME_ALL,
162 rt2x00lib_intf_scheduled_iter,
163 rt2x00dev);
164 }
165
rt2x00lib_autowakeup(struct work_struct * work)166 static void rt2x00lib_autowakeup(struct work_struct *work)
167 {
168 struct rt2x00_dev *rt2x00dev =
169 container_of(work, struct rt2x00_dev, autowakeup_work.work);
170
171 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
172 return;
173
174 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
175 rt2x00_err(rt2x00dev, "Device failed to wakeup\n");
176 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
177 }
178
179 /*
180 * Interrupt context handlers.
181 */
rt2x00lib_bc_buffer_iter(void * data,u8 * mac,struct ieee80211_vif * vif)182 static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
183 struct ieee80211_vif *vif)
184 {
185 struct ieee80211_tx_control control = {};
186 struct rt2x00_dev *rt2x00dev = data;
187 struct sk_buff *skb;
188
189 /*
190 * Only AP mode interfaces do broad- and multicast buffering
191 */
192 if (vif->type != NL80211_IFTYPE_AP)
193 return;
194
195 /*
196 * Send out buffered broad- and multicast frames
197 */
198 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
199 while (skb) {
200 rt2x00mac_tx(rt2x00dev->hw, &control, skb);
201 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
202 }
203 }
204
rt2x00lib_beaconupdate_iter(void * data,u8 * mac,struct ieee80211_vif * vif)205 static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
206 struct ieee80211_vif *vif)
207 {
208 struct rt2x00_dev *rt2x00dev = data;
209
210 if (vif->type != NL80211_IFTYPE_AP &&
211 vif->type != NL80211_IFTYPE_ADHOC &&
212 vif->type != NL80211_IFTYPE_MESH_POINT &&
213 vif->type != NL80211_IFTYPE_WDS)
214 return;
215
216 /*
217 * Update the beacon without locking. This is safe on PCI devices
218 * as they only update the beacon periodically here. This should
219 * never be called for USB devices.
220 */
221 WARN_ON(rt2x00_is_usb(rt2x00dev));
222 rt2x00queue_update_beacon(rt2x00dev, vif);
223 }
224
rt2x00lib_beacondone(struct rt2x00_dev * rt2x00dev)225 void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
226 {
227 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
228 return;
229
230 /* send buffered bc/mc frames out for every bssid */
231 ieee80211_iterate_active_interfaces_atomic(
232 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
233 rt2x00lib_bc_buffer_iter, rt2x00dev);
234 /*
235 * Devices with pre tbtt interrupt don't need to update the beacon
236 * here as they will fetch the next beacon directly prior to
237 * transmission.
238 */
239 if (rt2x00_has_cap_pre_tbtt_interrupt(rt2x00dev))
240 return;
241
242 /* fetch next beacon */
243 ieee80211_iterate_active_interfaces_atomic(
244 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
245 rt2x00lib_beaconupdate_iter, rt2x00dev);
246 }
247 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
248
rt2x00lib_pretbtt(struct rt2x00_dev * rt2x00dev)249 void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
250 {
251 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
252 return;
253
254 /* fetch next beacon */
255 ieee80211_iterate_active_interfaces_atomic(
256 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
257 rt2x00lib_beaconupdate_iter, rt2x00dev);
258 }
259 EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
260
rt2x00lib_dmastart(struct queue_entry * entry)261 void rt2x00lib_dmastart(struct queue_entry *entry)
262 {
263 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
264 rt2x00queue_index_inc(entry, Q_INDEX);
265 }
266 EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
267
rt2x00lib_dmadone(struct queue_entry * entry)268 void rt2x00lib_dmadone(struct queue_entry *entry)
269 {
270 set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
271 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
272 rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
273 }
274 EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
275
rt2x00lib_txdone_bar_status(struct queue_entry * entry)276 static inline int rt2x00lib_txdone_bar_status(struct queue_entry *entry)
277 {
278 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
279 struct ieee80211_bar *bar = (void *) entry->skb->data;
280 struct rt2x00_bar_list_entry *bar_entry;
281 int ret;
282
283 if (likely(!ieee80211_is_back_req(bar->frame_control)))
284 return 0;
285
286 /*
287 * Unlike all other frames, the status report for BARs does
288 * not directly come from the hardware as it is incapable of
289 * matching a BA to a previously send BAR. The hardware will
290 * report all BARs as if they weren't acked at all.
291 *
292 * Instead the RX-path will scan for incoming BAs and set the
293 * block_acked flag if it sees one that was likely caused by
294 * a BAR from us.
295 *
296 * Remove remaining BARs here and return their status for
297 * TX done processing.
298 */
299 ret = 0;
300 rcu_read_lock();
301 list_for_each_entry_rcu(bar_entry, &rt2x00dev->bar_list, list) {
302 if (bar_entry->entry != entry)
303 continue;
304
305 spin_lock_bh(&rt2x00dev->bar_list_lock);
306 /* Return whether this BAR was blockacked or not */
307 ret = bar_entry->block_acked;
308 /* Remove the BAR from our checklist */
309 list_del_rcu(&bar_entry->list);
310 spin_unlock_bh(&rt2x00dev->bar_list_lock);
311 kfree_rcu(bar_entry, head);
312
313 break;
314 }
315 rcu_read_unlock();
316
317 return ret;
318 }
319
rt2x00lib_txdone(struct queue_entry * entry,struct txdone_entry_desc * txdesc)320 void rt2x00lib_txdone(struct queue_entry *entry,
321 struct txdone_entry_desc *txdesc)
322 {
323 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
324 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
325 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
326 unsigned int header_length, i;
327 u8 rate_idx, rate_flags, retry_rates;
328 u8 skbdesc_flags = skbdesc->flags;
329 bool success;
330
331 /*
332 * Unmap the skb.
333 */
334 rt2x00queue_unmap_skb(entry);
335
336 /*
337 * Remove the extra tx headroom from the skb.
338 */
339 skb_pull(entry->skb, rt2x00dev->extra_tx_headroom);
340
341 /*
342 * Signal that the TX descriptor is no longer in the skb.
343 */
344 skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
345
346 /*
347 * Determine the length of 802.11 header.
348 */
349 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
350
351 /*
352 * Remove L2 padding which was added during
353 */
354 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
355 rt2x00queue_remove_l2pad(entry->skb, header_length);
356
357 /*
358 * If the IV/EIV data was stripped from the frame before it was
359 * passed to the hardware, we should now reinsert it again because
360 * mac80211 will expect the same data to be present it the
361 * frame as it was passed to us.
362 */
363 if (rt2x00_has_cap_hw_crypto(rt2x00dev))
364 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
365
366 /*
367 * Send frame to debugfs immediately, after this call is completed
368 * we are going to overwrite the skb->cb array.
369 */
370 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
371
372 /*
373 * Determine if the frame has been successfully transmitted and
374 * remove BARs from our check list while checking for their
375 * TX status.
376 */
377 success =
378 rt2x00lib_txdone_bar_status(entry) ||
379 test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
380 test_bit(TXDONE_UNKNOWN, &txdesc->flags);
381
382 /*
383 * Update TX statistics.
384 */
385 rt2x00dev->link.qual.tx_success += success;
386 rt2x00dev->link.qual.tx_failed += !success;
387
388 rate_idx = skbdesc->tx_rate_idx;
389 rate_flags = skbdesc->tx_rate_flags;
390 retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
391 (txdesc->retry + 1) : 1;
392
393 /*
394 * Initialize TX status
395 */
396 memset(&tx_info->status, 0, sizeof(tx_info->status));
397 tx_info->status.ack_signal = 0;
398
399 /*
400 * Frame was send with retries, hardware tried
401 * different rates to send out the frame, at each
402 * retry it lowered the rate 1 step except when the
403 * lowest rate was used.
404 */
405 for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
406 tx_info->status.rates[i].idx = rate_idx - i;
407 tx_info->status.rates[i].flags = rate_flags;
408
409 if (rate_idx - i == 0) {
410 /*
411 * The lowest rate (index 0) was used until the
412 * number of max retries was reached.
413 */
414 tx_info->status.rates[i].count = retry_rates - i;
415 i++;
416 break;
417 }
418 tx_info->status.rates[i].count = 1;
419 }
420 if (i < (IEEE80211_TX_MAX_RATES - 1))
421 tx_info->status.rates[i].idx = -1; /* terminate */
422
423 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
424 if (success)
425 tx_info->flags |= IEEE80211_TX_STAT_ACK;
426 else
427 rt2x00dev->low_level_stats.dot11ACKFailureCount++;
428 }
429
430 /*
431 * Every single frame has it's own tx status, hence report
432 * every frame as ampdu of size 1.
433 *
434 * TODO: if we can find out how many frames were aggregated
435 * by the hw we could provide the real ampdu_len to mac80211
436 * which would allow the rc algorithm to better decide on
437 * which rates are suitable.
438 */
439 if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
440 tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
441 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
442 tx_info->status.ampdu_len = 1;
443 tx_info->status.ampdu_ack_len = success ? 1 : 0;
444
445 if (!success)
446 tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
447 }
448
449 if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
450 if (success)
451 rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
452 else
453 rt2x00dev->low_level_stats.dot11RTSFailureCount++;
454 }
455
456 /*
457 * Only send the status report to mac80211 when it's a frame
458 * that originated in mac80211. If this was a extra frame coming
459 * through a mac80211 library call (RTS/CTS) then we should not
460 * send the status report back.
461 */
462 if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
463 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TASKLET_CONTEXT))
464 ieee80211_tx_status(rt2x00dev->hw, entry->skb);
465 else
466 ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
467 } else
468 dev_kfree_skb_any(entry->skb);
469
470 /*
471 * Make this entry available for reuse.
472 */
473 entry->skb = NULL;
474 entry->flags = 0;
475
476 rt2x00dev->ops->lib->clear_entry(entry);
477
478 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
479
480 /*
481 * If the data queue was below the threshold before the txdone
482 * handler we must make sure the packet queue in the mac80211 stack
483 * is reenabled when the txdone handler has finished. This has to be
484 * serialized with rt2x00mac_tx(), otherwise we can wake up queue
485 * before it was stopped.
486 */
487 spin_lock_bh(&entry->queue->tx_lock);
488 if (!rt2x00queue_threshold(entry->queue))
489 rt2x00queue_unpause_queue(entry->queue);
490 spin_unlock_bh(&entry->queue->tx_lock);
491 }
492 EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
493
rt2x00lib_txdone_noinfo(struct queue_entry * entry,u32 status)494 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
495 {
496 struct txdone_entry_desc txdesc;
497
498 txdesc.flags = 0;
499 __set_bit(status, &txdesc.flags);
500 txdesc.retry = 0;
501
502 rt2x00lib_txdone(entry, &txdesc);
503 }
504 EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
505
rt2x00lib_find_ie(u8 * data,unsigned int len,u8 ie)506 static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
507 {
508 struct ieee80211_mgmt *mgmt = (void *)data;
509 u8 *pos, *end;
510
511 pos = (u8 *)mgmt->u.beacon.variable;
512 end = data + len;
513 while (pos < end) {
514 if (pos + 2 + pos[1] > end)
515 return NULL;
516
517 if (pos[0] == ie)
518 return pos;
519
520 pos += 2 + pos[1];
521 }
522
523 return NULL;
524 }
525
rt2x00lib_sleep(struct work_struct * work)526 static void rt2x00lib_sleep(struct work_struct *work)
527 {
528 struct rt2x00_dev *rt2x00dev =
529 container_of(work, struct rt2x00_dev, sleep_work);
530
531 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
532 return;
533
534 /*
535 * Check again is powersaving is enabled, to prevent races from delayed
536 * work execution.
537 */
538 if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
539 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
540 IEEE80211_CONF_CHANGE_PS);
541 }
542
rt2x00lib_rxdone_check_ba(struct rt2x00_dev * rt2x00dev,struct sk_buff * skb,struct rxdone_entry_desc * rxdesc)543 static void rt2x00lib_rxdone_check_ba(struct rt2x00_dev *rt2x00dev,
544 struct sk_buff *skb,
545 struct rxdone_entry_desc *rxdesc)
546 {
547 struct rt2x00_bar_list_entry *entry;
548 struct ieee80211_bar *ba = (void *)skb->data;
549
550 if (likely(!ieee80211_is_back(ba->frame_control)))
551 return;
552
553 if (rxdesc->size < sizeof(*ba) + FCS_LEN)
554 return;
555
556 rcu_read_lock();
557 list_for_each_entry_rcu(entry, &rt2x00dev->bar_list, list) {
558
559 if (ba->start_seq_num != entry->start_seq_num)
560 continue;
561
562 #define TID_CHECK(a, b) ( \
563 ((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) == \
564 ((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK))) \
565
566 if (!TID_CHECK(ba->control, entry->control))
567 continue;
568
569 #undef TID_CHECK
570
571 if (!ether_addr_equal_64bits(ba->ra, entry->ta))
572 continue;
573
574 if (!ether_addr_equal_64bits(ba->ta, entry->ra))
575 continue;
576
577 /* Mark BAR since we received the according BA */
578 spin_lock_bh(&rt2x00dev->bar_list_lock);
579 entry->block_acked = 1;
580 spin_unlock_bh(&rt2x00dev->bar_list_lock);
581 break;
582 }
583 rcu_read_unlock();
584
585 }
586
rt2x00lib_rxdone_check_ps(struct rt2x00_dev * rt2x00dev,struct sk_buff * skb,struct rxdone_entry_desc * rxdesc)587 static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
588 struct sk_buff *skb,
589 struct rxdone_entry_desc *rxdesc)
590 {
591 struct ieee80211_hdr *hdr = (void *) skb->data;
592 struct ieee80211_tim_ie *tim_ie;
593 u8 *tim;
594 u8 tim_len;
595 bool cam;
596
597 /* If this is not a beacon, or if mac80211 has no powersaving
598 * configured, or if the device is already in powersaving mode
599 * we can exit now. */
600 if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
601 !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
602 return;
603
604 /* min. beacon length + FCS_LEN */
605 if (skb->len <= 40 + FCS_LEN)
606 return;
607
608 /* and only beacons from the associated BSSID, please */
609 if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
610 !rt2x00dev->aid)
611 return;
612
613 rt2x00dev->last_beacon = jiffies;
614
615 tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
616 if (!tim)
617 return;
618
619 if (tim[1] < sizeof(*tim_ie))
620 return;
621
622 tim_len = tim[1];
623 tim_ie = (struct ieee80211_tim_ie *) &tim[2];
624
625 /* Check whenever the PHY can be turned off again. */
626
627 /* 1. What about buffered unicast traffic for our AID? */
628 cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
629
630 /* 2. Maybe the AP wants to send multicast/broadcast data? */
631 cam |= (tim_ie->bitmap_ctrl & 0x01);
632
633 if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
634 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
635 }
636
rt2x00lib_rxdone_read_signal(struct rt2x00_dev * rt2x00dev,struct rxdone_entry_desc * rxdesc)637 static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
638 struct rxdone_entry_desc *rxdesc)
639 {
640 struct ieee80211_supported_band *sband;
641 const struct rt2x00_rate *rate;
642 unsigned int i;
643 int signal = rxdesc->signal;
644 int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
645
646 switch (rxdesc->rate_mode) {
647 case RATE_MODE_CCK:
648 case RATE_MODE_OFDM:
649 /*
650 * For non-HT rates the MCS value needs to contain the
651 * actually used rate modulation (CCK or OFDM).
652 */
653 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
654 signal = RATE_MCS(rxdesc->rate_mode, signal);
655
656 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
657 for (i = 0; i < sband->n_bitrates; i++) {
658 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
659 if (((type == RXDONE_SIGNAL_PLCP) &&
660 (rate->plcp == signal)) ||
661 ((type == RXDONE_SIGNAL_BITRATE) &&
662 (rate->bitrate == signal)) ||
663 ((type == RXDONE_SIGNAL_MCS) &&
664 (rate->mcs == signal))) {
665 return i;
666 }
667 }
668 break;
669 case RATE_MODE_HT_MIX:
670 case RATE_MODE_HT_GREENFIELD:
671 if (signal >= 0 && signal <= 76)
672 return signal;
673 break;
674 default:
675 break;
676 }
677
678 rt2x00_warn(rt2x00dev, "Frame received with unrecognized signal, mode=0x%.4x, signal=0x%.4x, type=%d\n",
679 rxdesc->rate_mode, signal, type);
680 return 0;
681 }
682
rt2x00lib_rxdone(struct queue_entry * entry,gfp_t gfp)683 void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
684 {
685 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
686 struct rxdone_entry_desc rxdesc;
687 struct sk_buff *skb;
688 struct ieee80211_rx_status *rx_status;
689 unsigned int header_length;
690 int rate_idx;
691
692 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
693 !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
694 goto submit_entry;
695
696 if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
697 goto submit_entry;
698
699 /*
700 * Allocate a new sk_buffer. If no new buffer available, drop the
701 * received frame and reuse the existing buffer.
702 */
703 skb = rt2x00queue_alloc_rxskb(entry, gfp);
704 if (!skb)
705 goto submit_entry;
706
707 /*
708 * Unmap the skb.
709 */
710 rt2x00queue_unmap_skb(entry);
711
712 /*
713 * Extract the RXD details.
714 */
715 memset(&rxdesc, 0, sizeof(rxdesc));
716 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
717
718 /*
719 * Check for valid size in case we get corrupted descriptor from
720 * hardware.
721 */
722 if (unlikely(rxdesc.size == 0 ||
723 rxdesc.size > entry->queue->data_size)) {
724 rt2x00_err(rt2x00dev, "Wrong frame size %d max %d\n",
725 rxdesc.size, entry->queue->data_size);
726 dev_kfree_skb(entry->skb);
727 goto renew_skb;
728 }
729
730 /*
731 * The data behind the ieee80211 header must be
732 * aligned on a 4 byte boundary.
733 */
734 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
735
736 /*
737 * Hardware might have stripped the IV/EIV/ICV data,
738 * in that case it is possible that the data was
739 * provided separately (through hardware descriptor)
740 * in which case we should reinsert the data into the frame.
741 */
742 if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
743 (rxdesc.flags & RX_FLAG_IV_STRIPPED))
744 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
745 &rxdesc);
746 else if (header_length &&
747 (rxdesc.size > header_length) &&
748 (rxdesc.dev_flags & RXDONE_L2PAD))
749 rt2x00queue_remove_l2pad(entry->skb, header_length);
750
751 /* Trim buffer to correct size */
752 skb_trim(entry->skb, rxdesc.size);
753
754 /*
755 * Translate the signal to the correct bitrate index.
756 */
757 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
758 if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
759 rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
760 rxdesc.flags |= RX_FLAG_HT;
761
762 /*
763 * Check if this is a beacon, and more frames have been
764 * buffered while we were in powersaving mode.
765 */
766 rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
767
768 /*
769 * Check for incoming BlockAcks to match to the BlockAckReqs
770 * we've send out.
771 */
772 rt2x00lib_rxdone_check_ba(rt2x00dev, entry->skb, &rxdesc);
773
774 /*
775 * Update extra components
776 */
777 rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
778 rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
779 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
780
781 /*
782 * Initialize RX status information, and send frame
783 * to mac80211.
784 */
785 rx_status = IEEE80211_SKB_RXCB(entry->skb);
786
787 /* Ensure that all fields of rx_status are initialized
788 * properly. The skb->cb array was used for driver
789 * specific informations, so rx_status might contain
790 * garbage.
791 */
792 memset(rx_status, 0, sizeof(*rx_status));
793
794 rx_status->mactime = rxdesc.timestamp;
795 rx_status->band = rt2x00dev->curr_band;
796 rx_status->freq = rt2x00dev->curr_freq;
797 rx_status->rate_idx = rate_idx;
798 rx_status->signal = rxdesc.rssi;
799 rx_status->flag = rxdesc.flags;
800 rx_status->antenna = rt2x00dev->link.ant.active.rx;
801
802 ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
803
804 renew_skb:
805 /*
806 * Replace the skb with the freshly allocated one.
807 */
808 entry->skb = skb;
809
810 submit_entry:
811 entry->flags = 0;
812 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
813 if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
814 test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
815 rt2x00dev->ops->lib->clear_entry(entry);
816 }
817 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
818
819 /*
820 * Driver initialization handlers.
821 */
822 const struct rt2x00_rate rt2x00_supported_rates[12] = {
823 {
824 .flags = DEV_RATE_CCK,
825 .bitrate = 10,
826 .ratemask = BIT(0),
827 .plcp = 0x00,
828 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
829 },
830 {
831 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
832 .bitrate = 20,
833 .ratemask = BIT(1),
834 .plcp = 0x01,
835 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
836 },
837 {
838 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
839 .bitrate = 55,
840 .ratemask = BIT(2),
841 .plcp = 0x02,
842 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
843 },
844 {
845 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
846 .bitrate = 110,
847 .ratemask = BIT(3),
848 .plcp = 0x03,
849 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
850 },
851 {
852 .flags = DEV_RATE_OFDM,
853 .bitrate = 60,
854 .ratemask = BIT(4),
855 .plcp = 0x0b,
856 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
857 },
858 {
859 .flags = DEV_RATE_OFDM,
860 .bitrate = 90,
861 .ratemask = BIT(5),
862 .plcp = 0x0f,
863 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
864 },
865 {
866 .flags = DEV_RATE_OFDM,
867 .bitrate = 120,
868 .ratemask = BIT(6),
869 .plcp = 0x0a,
870 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
871 },
872 {
873 .flags = DEV_RATE_OFDM,
874 .bitrate = 180,
875 .ratemask = BIT(7),
876 .plcp = 0x0e,
877 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
878 },
879 {
880 .flags = DEV_RATE_OFDM,
881 .bitrate = 240,
882 .ratemask = BIT(8),
883 .plcp = 0x09,
884 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
885 },
886 {
887 .flags = DEV_RATE_OFDM,
888 .bitrate = 360,
889 .ratemask = BIT(9),
890 .plcp = 0x0d,
891 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
892 },
893 {
894 .flags = DEV_RATE_OFDM,
895 .bitrate = 480,
896 .ratemask = BIT(10),
897 .plcp = 0x08,
898 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
899 },
900 {
901 .flags = DEV_RATE_OFDM,
902 .bitrate = 540,
903 .ratemask = BIT(11),
904 .plcp = 0x0c,
905 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
906 },
907 };
908
rt2x00lib_channel(struct ieee80211_channel * entry,const int channel,const int tx_power,const int value)909 static void rt2x00lib_channel(struct ieee80211_channel *entry,
910 const int channel, const int tx_power,
911 const int value)
912 {
913 /* XXX: this assumption about the band is wrong for 802.11j */
914 entry->band = channel <= 14 ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
915 entry->center_freq = ieee80211_channel_to_frequency(channel,
916 entry->band);
917 entry->hw_value = value;
918 entry->max_power = tx_power;
919 entry->max_antenna_gain = 0xff;
920 }
921
rt2x00lib_rate(struct ieee80211_rate * entry,const u16 index,const struct rt2x00_rate * rate)922 static void rt2x00lib_rate(struct ieee80211_rate *entry,
923 const u16 index, const struct rt2x00_rate *rate)
924 {
925 entry->flags = 0;
926 entry->bitrate = rate->bitrate;
927 entry->hw_value = index;
928 entry->hw_value_short = index;
929
930 if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
931 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
932 }
933
rt2x00lib_probe_hw_modes(struct rt2x00_dev * rt2x00dev,struct hw_mode_spec * spec)934 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
935 struct hw_mode_spec *spec)
936 {
937 struct ieee80211_hw *hw = rt2x00dev->hw;
938 struct ieee80211_channel *channels;
939 struct ieee80211_rate *rates;
940 unsigned int num_rates;
941 unsigned int i;
942
943 num_rates = 0;
944 if (spec->supported_rates & SUPPORT_RATE_CCK)
945 num_rates += 4;
946 if (spec->supported_rates & SUPPORT_RATE_OFDM)
947 num_rates += 8;
948
949 channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
950 if (!channels)
951 return -ENOMEM;
952
953 rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
954 if (!rates)
955 goto exit_free_channels;
956
957 /*
958 * Initialize Rate list.
959 */
960 for (i = 0; i < num_rates; i++)
961 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
962
963 /*
964 * Initialize Channel list.
965 */
966 for (i = 0; i < spec->num_channels; i++) {
967 rt2x00lib_channel(&channels[i],
968 spec->channels[i].channel,
969 spec->channels_info[i].max_power, i);
970 }
971
972 /*
973 * Intitialize 802.11b, 802.11g
974 * Rates: CCK, OFDM.
975 * Channels: 2.4 GHz
976 */
977 if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
978 rt2x00dev->bands[NL80211_BAND_2GHZ].n_channels = 14;
979 rt2x00dev->bands[NL80211_BAND_2GHZ].n_bitrates = num_rates;
980 rt2x00dev->bands[NL80211_BAND_2GHZ].channels = channels;
981 rt2x00dev->bands[NL80211_BAND_2GHZ].bitrates = rates;
982 hw->wiphy->bands[NL80211_BAND_2GHZ] =
983 &rt2x00dev->bands[NL80211_BAND_2GHZ];
984 memcpy(&rt2x00dev->bands[NL80211_BAND_2GHZ].ht_cap,
985 &spec->ht, sizeof(spec->ht));
986 }
987
988 /*
989 * Intitialize 802.11a
990 * Rates: OFDM.
991 * Channels: OFDM, UNII, HiperLAN2.
992 */
993 if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
994 rt2x00dev->bands[NL80211_BAND_5GHZ].n_channels =
995 spec->num_channels - 14;
996 rt2x00dev->bands[NL80211_BAND_5GHZ].n_bitrates =
997 num_rates - 4;
998 rt2x00dev->bands[NL80211_BAND_5GHZ].channels = &channels[14];
999 rt2x00dev->bands[NL80211_BAND_5GHZ].bitrates = &rates[4];
1000 hw->wiphy->bands[NL80211_BAND_5GHZ] =
1001 &rt2x00dev->bands[NL80211_BAND_5GHZ];
1002 memcpy(&rt2x00dev->bands[NL80211_BAND_5GHZ].ht_cap,
1003 &spec->ht, sizeof(spec->ht));
1004 }
1005
1006 return 0;
1007
1008 exit_free_channels:
1009 kfree(channels);
1010 rt2x00_err(rt2x00dev, "Allocation ieee80211 modes failed\n");
1011 return -ENOMEM;
1012 }
1013
rt2x00lib_remove_hw(struct rt2x00_dev * rt2x00dev)1014 static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
1015 {
1016 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1017 ieee80211_unregister_hw(rt2x00dev->hw);
1018
1019 if (likely(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ])) {
1020 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels);
1021 kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->bitrates);
1022 rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ] = NULL;
1023 rt2x00dev->hw->wiphy->bands[NL80211_BAND_5GHZ] = NULL;
1024 }
1025
1026 kfree(rt2x00dev->spec.channels_info);
1027 }
1028
rt2x00lib_probe_hw(struct rt2x00_dev * rt2x00dev)1029 static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
1030 {
1031 struct hw_mode_spec *spec = &rt2x00dev->spec;
1032 int status;
1033
1034 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1035 return 0;
1036
1037 /*
1038 * Initialize HW modes.
1039 */
1040 status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
1041 if (status)
1042 return status;
1043
1044 /*
1045 * Initialize HW fields.
1046 */
1047 rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
1048
1049 /*
1050 * Initialize extra TX headroom required.
1051 */
1052 rt2x00dev->hw->extra_tx_headroom =
1053 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
1054 rt2x00dev->extra_tx_headroom);
1055
1056 /*
1057 * Take TX headroom required for alignment into account.
1058 */
1059 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
1060 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
1061 else if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA))
1062 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
1063
1064 /*
1065 * Tell mac80211 about the size of our private STA structure.
1066 */
1067 rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
1068
1069 /*
1070 * Allocate tx status FIFO for driver use.
1071 */
1072 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO)) {
1073 /*
1074 * Allocate the txstatus fifo. In the worst case the tx
1075 * status fifo has to hold the tx status of all entries
1076 * in all tx queues. Hence, calculate the kfifo size as
1077 * tx_queues * entry_num and round up to the nearest
1078 * power of 2.
1079 */
1080 int kfifo_size =
1081 roundup_pow_of_two(rt2x00dev->ops->tx_queues *
1082 rt2x00dev->tx->limit *
1083 sizeof(u32));
1084
1085 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
1086 GFP_KERNEL);
1087 if (status)
1088 return status;
1089 }
1090
1091 /*
1092 * Initialize tasklets if used by the driver. Tasklets are
1093 * disabled until the interrupts are turned on. The driver
1094 * has to handle that.
1095 */
1096 #define RT2X00_TASKLET_INIT(taskletname) \
1097 if (rt2x00dev->ops->lib->taskletname) { \
1098 tasklet_init(&rt2x00dev->taskletname, \
1099 rt2x00dev->ops->lib->taskletname, \
1100 (unsigned long)rt2x00dev); \
1101 }
1102
1103 RT2X00_TASKLET_INIT(txstatus_tasklet);
1104 RT2X00_TASKLET_INIT(pretbtt_tasklet);
1105 RT2X00_TASKLET_INIT(tbtt_tasklet);
1106 RT2X00_TASKLET_INIT(rxdone_tasklet);
1107 RT2X00_TASKLET_INIT(autowake_tasklet);
1108
1109 #undef RT2X00_TASKLET_INIT
1110
1111 /*
1112 * Register HW.
1113 */
1114 status = ieee80211_register_hw(rt2x00dev->hw);
1115 if (status)
1116 return status;
1117
1118 set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1119
1120 return 0;
1121 }
1122
1123 /*
1124 * Initialization/uninitialization handlers.
1125 */
rt2x00lib_uninitialize(struct rt2x00_dev * rt2x00dev)1126 static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1127 {
1128 if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1129 return;
1130
1131 /*
1132 * Stop rfkill polling.
1133 */
1134 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1135 rt2x00rfkill_unregister(rt2x00dev);
1136
1137 /*
1138 * Allow the HW to uninitialize.
1139 */
1140 rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1141
1142 /*
1143 * Free allocated queue entries.
1144 */
1145 rt2x00queue_uninitialize(rt2x00dev);
1146 }
1147
rt2x00lib_initialize(struct rt2x00_dev * rt2x00dev)1148 static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1149 {
1150 int status;
1151
1152 if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1153 return 0;
1154
1155 /*
1156 * Allocate all queue entries.
1157 */
1158 status = rt2x00queue_initialize(rt2x00dev);
1159 if (status)
1160 return status;
1161
1162 /*
1163 * Initialize the device.
1164 */
1165 status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1166 if (status) {
1167 rt2x00queue_uninitialize(rt2x00dev);
1168 return status;
1169 }
1170
1171 set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1172
1173 /*
1174 * Start rfkill polling.
1175 */
1176 if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1177 rt2x00rfkill_register(rt2x00dev);
1178
1179 return 0;
1180 }
1181
rt2x00lib_start(struct rt2x00_dev * rt2x00dev)1182 int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1183 {
1184 int retval;
1185
1186 if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1187 return 0;
1188
1189 /*
1190 * If this is the first interface which is added,
1191 * we should load the firmware now.
1192 */
1193 retval = rt2x00lib_load_firmware(rt2x00dev);
1194 if (retval)
1195 return retval;
1196
1197 /*
1198 * Initialize the device.
1199 */
1200 retval = rt2x00lib_initialize(rt2x00dev);
1201 if (retval)
1202 return retval;
1203
1204 rt2x00dev->intf_ap_count = 0;
1205 rt2x00dev->intf_sta_count = 0;
1206 rt2x00dev->intf_associated = 0;
1207
1208 /* Enable the radio */
1209 retval = rt2x00lib_enable_radio(rt2x00dev);
1210 if (retval)
1211 return retval;
1212
1213 set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1214
1215 return 0;
1216 }
1217
rt2x00lib_stop(struct rt2x00_dev * rt2x00dev)1218 void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1219 {
1220 if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1221 return;
1222
1223 /*
1224 * Perhaps we can add something smarter here,
1225 * but for now just disabling the radio should do.
1226 */
1227 rt2x00lib_disable_radio(rt2x00dev);
1228
1229 rt2x00dev->intf_ap_count = 0;
1230 rt2x00dev->intf_sta_count = 0;
1231 rt2x00dev->intf_associated = 0;
1232 }
1233
rt2x00lib_set_if_combinations(struct rt2x00_dev * rt2x00dev)1234 static inline void rt2x00lib_set_if_combinations(struct rt2x00_dev *rt2x00dev)
1235 {
1236 struct ieee80211_iface_limit *if_limit;
1237 struct ieee80211_iface_combination *if_combination;
1238
1239 if (rt2x00dev->ops->max_ap_intf < 2)
1240 return;
1241
1242 /*
1243 * Build up AP interface limits structure.
1244 */
1245 if_limit = &rt2x00dev->if_limits_ap;
1246 if_limit->max = rt2x00dev->ops->max_ap_intf;
1247 if_limit->types = BIT(NL80211_IFTYPE_AP);
1248 #ifdef CONFIG_MAC80211_MESH
1249 if_limit->types |= BIT(NL80211_IFTYPE_MESH_POINT);
1250 #endif
1251
1252 /*
1253 * Build up AP interface combinations structure.
1254 */
1255 if_combination = &rt2x00dev->if_combinations[IF_COMB_AP];
1256 if_combination->limits = if_limit;
1257 if_combination->n_limits = 1;
1258 if_combination->max_interfaces = if_limit->max;
1259 if_combination->num_different_channels = 1;
1260
1261 /*
1262 * Finally, specify the possible combinations to mac80211.
1263 */
1264 rt2x00dev->hw->wiphy->iface_combinations = rt2x00dev->if_combinations;
1265 rt2x00dev->hw->wiphy->n_iface_combinations = 1;
1266 }
1267
rt2x00dev_extra_tx_headroom(struct rt2x00_dev * rt2x00dev)1268 static unsigned int rt2x00dev_extra_tx_headroom(struct rt2x00_dev *rt2x00dev)
1269 {
1270 if (WARN_ON(!rt2x00dev->tx))
1271 return 0;
1272
1273 if (rt2x00_is_usb(rt2x00dev))
1274 return rt2x00dev->tx[0].winfo_size + rt2x00dev->tx[0].desc_size;
1275
1276 return rt2x00dev->tx[0].winfo_size;
1277 }
1278
1279 /*
1280 * driver allocation handlers.
1281 */
rt2x00lib_probe_dev(struct rt2x00_dev * rt2x00dev)1282 int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1283 {
1284 int retval = -ENOMEM;
1285
1286 /*
1287 * Set possible interface combinations.
1288 */
1289 rt2x00lib_set_if_combinations(rt2x00dev);
1290
1291 /*
1292 * Allocate the driver data memory, if necessary.
1293 */
1294 if (rt2x00dev->ops->drv_data_size > 0) {
1295 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
1296 GFP_KERNEL);
1297 if (!rt2x00dev->drv_data) {
1298 retval = -ENOMEM;
1299 goto exit;
1300 }
1301 }
1302
1303 spin_lock_init(&rt2x00dev->irqmask_lock);
1304 mutex_init(&rt2x00dev->csr_mutex);
1305 INIT_LIST_HEAD(&rt2x00dev->bar_list);
1306 spin_lock_init(&rt2x00dev->bar_list_lock);
1307
1308 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1309
1310 /*
1311 * Make room for rt2x00_intf inside the per-interface
1312 * structure ieee80211_vif.
1313 */
1314 rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1315
1316 /*
1317 * rt2x00 devices can only use the last n bits of the MAC address
1318 * for virtual interfaces.
1319 */
1320 rt2x00dev->hw->wiphy->addr_mask[ETH_ALEN - 1] =
1321 (rt2x00dev->ops->max_ap_intf - 1);
1322
1323 /*
1324 * Initialize work.
1325 */
1326 rt2x00dev->workqueue =
1327 alloc_ordered_workqueue("%s", 0, wiphy_name(rt2x00dev->hw->wiphy));
1328 if (!rt2x00dev->workqueue) {
1329 retval = -ENOMEM;
1330 goto exit;
1331 }
1332
1333 INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1334 INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1335 INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1336
1337 /*
1338 * Let the driver probe the device to detect the capabilities.
1339 */
1340 retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1341 if (retval) {
1342 rt2x00_err(rt2x00dev, "Failed to allocate device\n");
1343 goto exit;
1344 }
1345
1346 /*
1347 * Allocate queue array.
1348 */
1349 retval = rt2x00queue_allocate(rt2x00dev);
1350 if (retval)
1351 goto exit;
1352
1353 /* Cache TX headroom value */
1354 rt2x00dev->extra_tx_headroom = rt2x00dev_extra_tx_headroom(rt2x00dev);
1355
1356 /*
1357 * Determine which operating modes are supported, all modes
1358 * which require beaconing, depend on the availability of
1359 * beacon entries.
1360 */
1361 rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1362 if (rt2x00dev->bcn->limit > 0)
1363 rt2x00dev->hw->wiphy->interface_modes |=
1364 BIT(NL80211_IFTYPE_ADHOC) |
1365 BIT(NL80211_IFTYPE_AP) |
1366 #ifdef CONFIG_MAC80211_MESH
1367 BIT(NL80211_IFTYPE_MESH_POINT) |
1368 #endif
1369 BIT(NL80211_IFTYPE_WDS);
1370
1371 rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
1372
1373 /*
1374 * Initialize ieee80211 structure.
1375 */
1376 retval = rt2x00lib_probe_hw(rt2x00dev);
1377 if (retval) {
1378 rt2x00_err(rt2x00dev, "Failed to initialize hw\n");
1379 goto exit;
1380 }
1381
1382 /*
1383 * Register extra components.
1384 */
1385 rt2x00link_register(rt2x00dev);
1386 rt2x00leds_register(rt2x00dev);
1387 rt2x00debug_register(rt2x00dev);
1388
1389 /*
1390 * Start rfkill polling.
1391 */
1392 if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1393 rt2x00rfkill_register(rt2x00dev);
1394
1395 return 0;
1396
1397 exit:
1398 rt2x00lib_remove_dev(rt2x00dev);
1399
1400 return retval;
1401 }
1402 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1403
rt2x00lib_remove_dev(struct rt2x00_dev * rt2x00dev)1404 void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1405 {
1406 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1407
1408 /*
1409 * Stop rfkill polling.
1410 */
1411 if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
1412 rt2x00rfkill_unregister(rt2x00dev);
1413
1414 /*
1415 * Disable radio.
1416 */
1417 rt2x00lib_disable_radio(rt2x00dev);
1418
1419 /*
1420 * Stop all work.
1421 */
1422 cancel_work_sync(&rt2x00dev->intf_work);
1423 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1424 cancel_work_sync(&rt2x00dev->sleep_work);
1425
1426 /*
1427 * Kill the tx status tasklet.
1428 */
1429 tasklet_kill(&rt2x00dev->txstatus_tasklet);
1430 tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1431 tasklet_kill(&rt2x00dev->tbtt_tasklet);
1432 tasklet_kill(&rt2x00dev->rxdone_tasklet);
1433 tasklet_kill(&rt2x00dev->autowake_tasklet);
1434
1435 /*
1436 * Uninitialize device.
1437 */
1438 rt2x00lib_uninitialize(rt2x00dev);
1439
1440 if (rt2x00dev->workqueue)
1441 destroy_workqueue(rt2x00dev->workqueue);
1442
1443 /*
1444 * Free the tx status fifo.
1445 */
1446 kfifo_free(&rt2x00dev->txstatus_fifo);
1447
1448 /*
1449 * Free extra components
1450 */
1451 rt2x00debug_deregister(rt2x00dev);
1452 rt2x00leds_unregister(rt2x00dev);
1453
1454 /*
1455 * Free ieee80211_hw memory.
1456 */
1457 rt2x00lib_remove_hw(rt2x00dev);
1458
1459 /*
1460 * Free firmware image.
1461 */
1462 rt2x00lib_free_firmware(rt2x00dev);
1463
1464 /*
1465 * Free queue structures.
1466 */
1467 rt2x00queue_free(rt2x00dev);
1468
1469 /*
1470 * Free the driver data.
1471 */
1472 kfree(rt2x00dev->drv_data);
1473 }
1474 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1475
1476 /*
1477 * Device state handlers
1478 */
1479 #ifdef CONFIG_PM
rt2x00lib_suspend(struct rt2x00_dev * rt2x00dev,pm_message_t state)1480 int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1481 {
1482 rt2x00_dbg(rt2x00dev, "Going to sleep\n");
1483
1484 /*
1485 * Prevent mac80211 from accessing driver while suspended.
1486 */
1487 if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1488 return 0;
1489
1490 /*
1491 * Cleanup as much as possible.
1492 */
1493 rt2x00lib_uninitialize(rt2x00dev);
1494
1495 /*
1496 * Suspend/disable extra components.
1497 */
1498 rt2x00leds_suspend(rt2x00dev);
1499 rt2x00debug_deregister(rt2x00dev);
1500
1501 /*
1502 * Set device mode to sleep for power management,
1503 * on some hardware this call seems to consistently fail.
1504 * From the specifications it is hard to tell why it fails,
1505 * and if this is a "bad thing".
1506 * Overall it is safe to just ignore the failure and
1507 * continue suspending. The only downside is that the
1508 * device will not be in optimal power save mode, but with
1509 * the radio and the other components already disabled the
1510 * device is as good as disabled.
1511 */
1512 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1513 rt2x00_warn(rt2x00dev, "Device failed to enter sleep state, continue suspending\n");
1514
1515 return 0;
1516 }
1517 EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1518
rt2x00lib_resume(struct rt2x00_dev * rt2x00dev)1519 int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1520 {
1521 rt2x00_dbg(rt2x00dev, "Waking up\n");
1522
1523 /*
1524 * Restore/enable extra components.
1525 */
1526 rt2x00debug_register(rt2x00dev);
1527 rt2x00leds_resume(rt2x00dev);
1528
1529 /*
1530 * We are ready again to receive requests from mac80211.
1531 */
1532 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1533
1534 return 0;
1535 }
1536 EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1537 #endif /* CONFIG_PM */
1538
1539 /*
1540 * rt2x00lib module information.
1541 */
1542 MODULE_AUTHOR(DRV_PROJECT);
1543 MODULE_VERSION(DRV_VERSION);
1544 MODULE_DESCRIPTION("rt2x00 library");
1545 MODULE_LICENSE("GPL");
1546