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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, write to the
18 Free Software Foundation, Inc.,
19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22/*
23 Module: rt2x00lib
24 Abstract: rt2x00 generic device routines.
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/slab.h>
30#include <linux/log2.h>
31
32#include "rt2x00.h"
33#include "rt2x00lib.h"
34
35/*
36 * Radio control handlers.
37 */
38int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
39{
40 int status;
41
42 /*
43 * Don't enable the radio twice.
44 * And check if the hardware button has been disabled.
45 */
46 if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
47 return 0;
48
49 /*
50 * Initialize all data queues.
51 */
52 rt2x00queue_init_queues(rt2x00dev);
53
54 /*
55 * Enable radio.
56 */
57 status =
58 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
59 if (status)
60 return status;
61
62 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
63
64 rt2x00leds_led_radio(rt2x00dev, true);
65 rt2x00led_led_activity(rt2x00dev, true);
66
67 set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
68
69 /*
70 * Enable queues.
71 */
72 rt2x00queue_start_queues(rt2x00dev);
73 rt2x00link_start_tuner(rt2x00dev);
74 rt2x00link_start_agc(rt2x00dev);
75
76 /*
77 * Start watchdog monitoring.
78 */
79 rt2x00link_start_watchdog(rt2x00dev);
80
81 return 0;
82}
83
84void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
85{
86 if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
87 return;
88
89 /*
90 * Stop watchdog monitoring.
91 */
92 rt2x00link_stop_watchdog(rt2x00dev);
93
94 /*
95 * Stop all queues
96 */
97 rt2x00link_stop_agc(rt2x00dev);
98 rt2x00link_stop_tuner(rt2x00dev);
99 rt2x00queue_stop_queues(rt2x00dev);
100 rt2x00queue_flush_queues(rt2x00dev, true);
101
102 /*
103 * Disable radio.
104 */
105 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
106 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
107 rt2x00led_led_activity(rt2x00dev, false);
108 rt2x00leds_led_radio(rt2x00dev, false);
109}
110
111static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
112 struct ieee80211_vif *vif)
113{
114 struct rt2x00_dev *rt2x00dev = data;
115 struct rt2x00_intf *intf = vif_to_intf(vif);
116
117 /*
118 * It is possible the radio was disabled while the work had been
119 * scheduled. If that happens we should return here immediately,
120 * note that in the spinlock protected area above the delayed_flags
121 * have been cleared correctly.
122 */
123 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
124 return;
125
126 if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
127 rt2x00queue_update_beacon(rt2x00dev, vif);
128}
129
130static void rt2x00lib_intf_scheduled(struct work_struct *work)
131{
132 struct rt2x00_dev *rt2x00dev =
133 container_of(work, struct rt2x00_dev, intf_work);
134
135 /*
136 * Iterate over each interface and perform the
137 * requested configurations.
138 */
139 ieee80211_iterate_active_interfaces(rt2x00dev->hw,
140 rt2x00lib_intf_scheduled_iter,
141 rt2x00dev);
142}
143
144static void rt2x00lib_autowakeup(struct work_struct *work)
145{
146 struct rt2x00_dev *rt2x00dev =
147 container_of(work, struct rt2x00_dev, autowakeup_work.work);
148
149 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
150 return;
151
152 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
153 ERROR(rt2x00dev, "Device failed to wakeup.\n");
154 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
155}
156
157/*
158 * Interrupt context handlers.
159 */
160static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
161 struct ieee80211_vif *vif)
162{
163 struct rt2x00_dev *rt2x00dev = data;
164 struct sk_buff *skb;
165
166 /*
167 * Only AP mode interfaces do broad- and multicast buffering
168 */
169 if (vif->type != NL80211_IFTYPE_AP)
170 return;
171
172 /*
173 * Send out buffered broad- and multicast frames
174 */
175 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
176 while (skb) {
177 rt2x00mac_tx(rt2x00dev->hw, skb);
178 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
179 }
180}
181
182static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
183 struct ieee80211_vif *vif)
184{
185 struct rt2x00_dev *rt2x00dev = data;
186
187 if (vif->type != NL80211_IFTYPE_AP &&
188 vif->type != NL80211_IFTYPE_ADHOC &&
189 vif->type != NL80211_IFTYPE_MESH_POINT &&
190 vif->type != NL80211_IFTYPE_WDS)
191 return;
192
193 /*
194 * Update the beacon without locking. This is safe on PCI devices
195 * as they only update the beacon periodically here. This should
196 * never be called for USB devices.
197 */
198 WARN_ON(rt2x00_is_usb(rt2x00dev));
199 rt2x00queue_update_beacon_locked(rt2x00dev, vif);
200}
201
202void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
203{
204 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
205 return;
206
207 /* send buffered bc/mc frames out for every bssid */
208 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
209 rt2x00lib_bc_buffer_iter,
210 rt2x00dev);
211 /*
212 * Devices with pre tbtt interrupt don't need to update the beacon
213 * here as they will fetch the next beacon directly prior to
214 * transmission.
215 */
216 if (test_bit(CAPABILITY_PRE_TBTT_INTERRUPT, &rt2x00dev->cap_flags))
217 return;
218
219 /* fetch next beacon */
220 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
221 rt2x00lib_beaconupdate_iter,
222 rt2x00dev);
223}
224EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
225
226void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
227{
228 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
229 return;
230
231 /* fetch next beacon */
232 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
233 rt2x00lib_beaconupdate_iter,
234 rt2x00dev);
235}
236EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
237
238void rt2x00lib_dmastart(struct queue_entry *entry)
239{
240 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
241 rt2x00queue_index_inc(entry, Q_INDEX);
242}
243EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
244
245void rt2x00lib_dmadone(struct queue_entry *entry)
246{
247 set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
248 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
249 rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
250}
251EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
252
253void rt2x00lib_txdone(struct queue_entry *entry,
254 struct txdone_entry_desc *txdesc)
255{
256 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
257 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
258 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
259 unsigned int header_length, i;
260 u8 rate_idx, rate_flags, retry_rates;
261 u8 skbdesc_flags = skbdesc->flags;
262 bool success;
263
264 /*
265 * Unmap the skb.
266 */
267 rt2x00queue_unmap_skb(entry);
268
269 /*
270 * Remove the extra tx headroom from the skb.
271 */
272 skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
273
274 /*
275 * Signal that the TX descriptor is no longer in the skb.
276 */
277 skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
278
279 /*
280 * Determine the length of 802.11 header.
281 */
282 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
283
284 /*
285 * Remove L2 padding which was added during
286 */
287 if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
288 rt2x00queue_remove_l2pad(entry->skb, header_length);
289
290 /*
291 * If the IV/EIV data was stripped from the frame before it was
292 * passed to the hardware, we should now reinsert it again because
293 * mac80211 will expect the same data to be present it the
294 * frame as it was passed to us.
295 */
296 if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
297 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
298
299 /*
300 * Send frame to debugfs immediately, after this call is completed
301 * we are going to overwrite the skb->cb array.
302 */
303 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
304
305 /*
306 * Determine if the frame has been successfully transmitted.
307 */
308 success =
309 test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
310 test_bit(TXDONE_UNKNOWN, &txdesc->flags);
311
312 /*
313 * Update TX statistics.
314 */
315 rt2x00dev->link.qual.tx_success += success;
316 rt2x00dev->link.qual.tx_failed += !success;
317
318 rate_idx = skbdesc->tx_rate_idx;
319 rate_flags = skbdesc->tx_rate_flags;
320 retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
321 (txdesc->retry + 1) : 1;
322
323 /*
324 * Initialize TX status
325 */
326 memset(&tx_info->status, 0, sizeof(tx_info->status));
327 tx_info->status.ack_signal = 0;
328
329 /*
330 * Frame was send with retries, hardware tried
331 * different rates to send out the frame, at each
332 * retry it lowered the rate 1 step except when the
333 * lowest rate was used.
334 */
335 for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
336 tx_info->status.rates[i].idx = rate_idx - i;
337 tx_info->status.rates[i].flags = rate_flags;
338
339 if (rate_idx - i == 0) {
340 /*
341 * The lowest rate (index 0) was used until the
342 * number of max retries was reached.
343 */
344 tx_info->status.rates[i].count = retry_rates - i;
345 i++;
346 break;
347 }
348 tx_info->status.rates[i].count = 1;
349 }
350 if (i < (IEEE80211_TX_MAX_RATES - 1))
351 tx_info->status.rates[i].idx = -1; /* terminate */
352
353 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
354 if (success)
355 tx_info->flags |= IEEE80211_TX_STAT_ACK;
356 else
357 rt2x00dev->low_level_stats.dot11ACKFailureCount++;
358 }
359
360 /*
361 * Every single frame has it's own tx status, hence report
362 * every frame as ampdu of size 1.
363 *
364 * TODO: if we can find out how many frames were aggregated
365 * by the hw we could provide the real ampdu_len to mac80211
366 * which would allow the rc algorithm to better decide on
367 * which rates are suitable.
368 */
369 if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
370 tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
371 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
372 tx_info->status.ampdu_len = 1;
373 tx_info->status.ampdu_ack_len = success ? 1 : 0;
374
375 if (!success)
376 tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
377 }
378
379 if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
380 if (success)
381 rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
382 else
383 rt2x00dev->low_level_stats.dot11RTSFailureCount++;
384 }
385
386 /*
387 * Only send the status report to mac80211 when it's a frame
388 * that originated in mac80211. If this was a extra frame coming
389 * through a mac80211 library call (RTS/CTS) then we should not
390 * send the status report back.
391 */
392 if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
393 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
394 ieee80211_tx_status(rt2x00dev->hw, entry->skb);
395 else
396 ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
397 } else
398 dev_kfree_skb_any(entry->skb);
399
400 /*
401 * Make this entry available for reuse.
402 */
403 entry->skb = NULL;
404 entry->flags = 0;
405
406 rt2x00dev->ops->lib->clear_entry(entry);
407
408 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
409
410 /*
411 * If the data queue was below the threshold before the txdone
412 * handler we must make sure the packet queue in the mac80211 stack
413 * is reenabled when the txdone handler has finished.
414 */
415 if (!rt2x00queue_threshold(entry->queue))
416 rt2x00queue_unpause_queue(entry->queue);
417}
418EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
419
420void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
421{
422 struct txdone_entry_desc txdesc;
423
424 txdesc.flags = 0;
425 __set_bit(status, &txdesc.flags);
426 txdesc.retry = 0;
427
428 rt2x00lib_txdone(entry, &txdesc);
429}
430EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
431
432static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
433{
434 struct ieee80211_mgmt *mgmt = (void *)data;
435 u8 *pos, *end;
436
437 pos = (u8 *)mgmt->u.beacon.variable;
438 end = data + len;
439 while (pos < end) {
440 if (pos + 2 + pos[1] > end)
441 return NULL;
442
443 if (pos[0] == ie)
444 return pos;
445
446 pos += 2 + pos[1];
447 }
448
449 return NULL;
450}
451
452static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
453 struct sk_buff *skb,
454 struct rxdone_entry_desc *rxdesc)
455{
456 struct ieee80211_hdr *hdr = (void *) skb->data;
457 struct ieee80211_tim_ie *tim_ie;
458 u8 *tim;
459 u8 tim_len;
460 bool cam;
461
462 /* If this is not a beacon, or if mac80211 has no powersaving
463 * configured, or if the device is already in powersaving mode
464 * we can exit now. */
465 if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
466 !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
467 return;
468
469 /* min. beacon length + FCS_LEN */
470 if (skb->len <= 40 + FCS_LEN)
471 return;
472
473 /* and only beacons from the associated BSSID, please */
474 if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
475 !rt2x00dev->aid)
476 return;
477
478 rt2x00dev->last_beacon = jiffies;
479
480 tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
481 if (!tim)
482 return;
483
484 if (tim[1] < sizeof(*tim_ie))
485 return;
486
487 tim_len = tim[1];
488 tim_ie = (struct ieee80211_tim_ie *) &tim[2];
489
490 /* Check whenever the PHY can be turned off again. */
491
492 /* 1. What about buffered unicast traffic for our AID? */
493 cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
494
495 /* 2. Maybe the AP wants to send multicast/broadcast data? */
496 cam |= (tim_ie->bitmap_ctrl & 0x01);
497
498 if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
499 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
500 IEEE80211_CONF_CHANGE_PS);
501}
502
503static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
504 struct rxdone_entry_desc *rxdesc)
505{
506 struct ieee80211_supported_band *sband;
507 const struct rt2x00_rate *rate;
508 unsigned int i;
509 int signal = rxdesc->signal;
510 int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
511
512 switch (rxdesc->rate_mode) {
513 case RATE_MODE_CCK:
514 case RATE_MODE_OFDM:
515 /*
516 * For non-HT rates the MCS value needs to contain the
517 * actually used rate modulation (CCK or OFDM).
518 */
519 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
520 signal = RATE_MCS(rxdesc->rate_mode, signal);
521
522 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
523 for (i = 0; i < sband->n_bitrates; i++) {
524 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
525 if (((type == RXDONE_SIGNAL_PLCP) &&
526 (rate->plcp == signal)) ||
527 ((type == RXDONE_SIGNAL_BITRATE) &&
528 (rate->bitrate == signal)) ||
529 ((type == RXDONE_SIGNAL_MCS) &&
530 (rate->mcs == signal))) {
531 return i;
532 }
533 }
534 break;
535 case RATE_MODE_HT_MIX:
536 case RATE_MODE_HT_GREENFIELD:
537 if (signal >= 0 && signal <= 76)
538 return signal;
539 break;
540 default:
541 break;
542 }
543
544 WARNING(rt2x00dev, "Frame received with unrecognized signal, "
545 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
546 rxdesc->rate_mode, signal, type);
547 return 0;
548}
549
550void rt2x00lib_rxdone(struct queue_entry *entry)
551{
552 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
553 struct rxdone_entry_desc rxdesc;
554 struct sk_buff *skb;
555 struct ieee80211_rx_status *rx_status;
556 unsigned int header_length;
557 int rate_idx;
558
559 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
560 !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
561 goto submit_entry;
562
563 if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
564 goto submit_entry;
565
566 /*
567 * Allocate a new sk_buffer. If no new buffer available, drop the
568 * received frame and reuse the existing buffer.
569 */
570 skb = rt2x00queue_alloc_rxskb(entry);
571 if (!skb)
572 goto submit_entry;
573
574 /*
575 * Unmap the skb.
576 */
577 rt2x00queue_unmap_skb(entry);
578
579 /*
580 * Extract the RXD details.
581 */
582 memset(&rxdesc, 0, sizeof(rxdesc));
583 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
584
585 /*
586 * Check for valid size in case we get corrupted descriptor from
587 * hardware.
588 */
589 if (unlikely(rxdesc.size == 0 ||
590 rxdesc.size > entry->queue->data_size)) {
591 WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
592 rxdesc.size, entry->queue->data_size);
593 dev_kfree_skb(entry->skb);
594 goto renew_skb;
595 }
596
597 /*
598 * The data behind the ieee80211 header must be
599 * aligned on a 4 byte boundary.
600 */
601 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
602
603 /*
604 * Hardware might have stripped the IV/EIV/ICV data,
605 * in that case it is possible that the data was
606 * provided separately (through hardware descriptor)
607 * in which case we should reinsert the data into the frame.
608 */
609 if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
610 (rxdesc.flags & RX_FLAG_IV_STRIPPED))
611 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
612 &rxdesc);
613 else if (header_length &&
614 (rxdesc.size > header_length) &&
615 (rxdesc.dev_flags & RXDONE_L2PAD))
616 rt2x00queue_remove_l2pad(entry->skb, header_length);
617
618 /* Trim buffer to correct size */
619 skb_trim(entry->skb, rxdesc.size);
620
621 /*
622 * Translate the signal to the correct bitrate index.
623 */
624 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
625 if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
626 rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
627 rxdesc.flags |= RX_FLAG_HT;
628
629 /*
630 * Check if this is a beacon, and more frames have been
631 * buffered while we were in powersaving mode.
632 */
633 rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
634
635 /*
636 * Update extra components
637 */
638 rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
639 rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
640 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
641
642 /*
643 * Initialize RX status information, and send frame
644 * to mac80211.
645 */
646 rx_status = IEEE80211_SKB_RXCB(entry->skb);
647 rx_status->mactime = rxdesc.timestamp;
648 rx_status->band = rt2x00dev->curr_band;
649 rx_status->freq = rt2x00dev->curr_freq;
650 rx_status->rate_idx = rate_idx;
651 rx_status->signal = rxdesc.rssi;
652 rx_status->flag = rxdesc.flags;
653 rx_status->antenna = rt2x00dev->link.ant.active.rx;
654
655 ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
656
657renew_skb:
658 /*
659 * Replace the skb with the freshly allocated one.
660 */
661 entry->skb = skb;
662
663submit_entry:
664 entry->flags = 0;
665 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
666 if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
667 test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
668 rt2x00dev->ops->lib->clear_entry(entry);
669}
670EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
671
672/*
673 * Driver initialization handlers.
674 */
675const struct rt2x00_rate rt2x00_supported_rates[12] = {
676 {
677 .flags = DEV_RATE_CCK,
678 .bitrate = 10,
679 .ratemask = BIT(0),
680 .plcp = 0x00,
681 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
682 },
683 {
684 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
685 .bitrate = 20,
686 .ratemask = BIT(1),
687 .plcp = 0x01,
688 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
689 },
690 {
691 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
692 .bitrate = 55,
693 .ratemask = BIT(2),
694 .plcp = 0x02,
695 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
696 },
697 {
698 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
699 .bitrate = 110,
700 .ratemask = BIT(3),
701 .plcp = 0x03,
702 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
703 },
704 {
705 .flags = DEV_RATE_OFDM,
706 .bitrate = 60,
707 .ratemask = BIT(4),
708 .plcp = 0x0b,
709 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
710 },
711 {
712 .flags = DEV_RATE_OFDM,
713 .bitrate = 90,
714 .ratemask = BIT(5),
715 .plcp = 0x0f,
716 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
717 },
718 {
719 .flags = DEV_RATE_OFDM,
720 .bitrate = 120,
721 .ratemask = BIT(6),
722 .plcp = 0x0a,
723 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
724 },
725 {
726 .flags = DEV_RATE_OFDM,
727 .bitrate = 180,
728 .ratemask = BIT(7),
729 .plcp = 0x0e,
730 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
731 },
732 {
733 .flags = DEV_RATE_OFDM,
734 .bitrate = 240,
735 .ratemask = BIT(8),
736 .plcp = 0x09,
737 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
738 },
739 {
740 .flags = DEV_RATE_OFDM,
741 .bitrate = 360,
742 .ratemask = BIT(9),
743 .plcp = 0x0d,
744 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
745 },
746 {
747 .flags = DEV_RATE_OFDM,
748 .bitrate = 480,
749 .ratemask = BIT(10),
750 .plcp = 0x08,
751 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
752 },
753 {
754 .flags = DEV_RATE_OFDM,
755 .bitrate = 540,
756 .ratemask = BIT(11),
757 .plcp = 0x0c,
758 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
759 },
760};
761
762static void rt2x00lib_channel(struct ieee80211_channel *entry,
763 const int channel, const int tx_power,
764 const int value)
765{
766 /* XXX: this assumption about the band is wrong for 802.11j */
767 entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
768 entry->center_freq = ieee80211_channel_to_frequency(channel,
769 entry->band);
770 entry->hw_value = value;
771 entry->max_power = tx_power;
772 entry->max_antenna_gain = 0xff;
773}
774
775static void rt2x00lib_rate(struct ieee80211_rate *entry,
776 const u16 index, const struct rt2x00_rate *rate)
777{
778 entry->flags = 0;
779 entry->bitrate = rate->bitrate;
780 entry->hw_value = index;
781 entry->hw_value_short = index;
782
783 if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
784 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
785}
786
787static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
788 struct hw_mode_spec *spec)
789{
790 struct ieee80211_hw *hw = rt2x00dev->hw;
791 struct ieee80211_channel *channels;
792 struct ieee80211_rate *rates;
793 unsigned int num_rates;
794 unsigned int i;
795
796 num_rates = 0;
797 if (spec->supported_rates & SUPPORT_RATE_CCK)
798 num_rates += 4;
799 if (spec->supported_rates & SUPPORT_RATE_OFDM)
800 num_rates += 8;
801
802 channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
803 if (!channels)
804 return -ENOMEM;
805
806 rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
807 if (!rates)
808 goto exit_free_channels;
809
810 /*
811 * Initialize Rate list.
812 */
813 for (i = 0; i < num_rates; i++)
814 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
815
816 /*
817 * Initialize Channel list.
818 */
819 for (i = 0; i < spec->num_channels; i++) {
820 rt2x00lib_channel(&channels[i],
821 spec->channels[i].channel,
822 spec->channels_info[i].max_power, i);
823 }
824
825 /*
826 * Intitialize 802.11b, 802.11g
827 * Rates: CCK, OFDM.
828 * Channels: 2.4 GHz
829 */
830 if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
831 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
832 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
833 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
834 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
835 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
836 &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
837 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
838 &spec->ht, sizeof(spec->ht));
839 }
840
841 /*
842 * Intitialize 802.11a
843 * Rates: OFDM.
844 * Channels: OFDM, UNII, HiperLAN2.
845 */
846 if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
847 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
848 spec->num_channels - 14;
849 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
850 num_rates - 4;
851 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
852 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
853 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
854 &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
855 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
856 &spec->ht, sizeof(spec->ht));
857 }
858
859 return 0;
860
861 exit_free_channels:
862 kfree(channels);
863 ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
864 return -ENOMEM;
865}
866
867static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
868{
869 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
870 ieee80211_unregister_hw(rt2x00dev->hw);
871
872 if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
873 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
874 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
875 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
876 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
877 }
878
879 kfree(rt2x00dev->spec.channels_info);
880}
881
882static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
883{
884 struct hw_mode_spec *spec = &rt2x00dev->spec;
885 int status;
886
887 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
888 return 0;
889
890 /*
891 * Initialize HW modes.
892 */
893 status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
894 if (status)
895 return status;
896
897 /*
898 * Initialize HW fields.
899 */
900 rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
901
902 /*
903 * Initialize extra TX headroom required.
904 */
905 rt2x00dev->hw->extra_tx_headroom =
906 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
907 rt2x00dev->ops->extra_tx_headroom);
908
909 /*
910 * Take TX headroom required for alignment into account.
911 */
912 if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
913 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
914 else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
915 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
916
917 /*
918 * Allocate tx status FIFO for driver use.
919 */
920 if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
921 /*
922 * Allocate the txstatus fifo. In the worst case the tx
923 * status fifo has to hold the tx status of all entries
924 * in all tx queues. Hence, calculate the kfifo size as
925 * tx_queues * entry_num and round up to the nearest
926 * power of 2.
927 */
928 int kfifo_size =
929 roundup_pow_of_two(rt2x00dev->ops->tx_queues *
930 rt2x00dev->ops->tx->entry_num *
931 sizeof(u32));
932
933 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
934 GFP_KERNEL);
935 if (status)
936 return status;
937 }
938
939 /*
940 * Initialize tasklets if used by the driver. Tasklets are
941 * disabled until the interrupts are turned on. The driver
942 * has to handle that.
943 */
944#define RT2X00_TASKLET_INIT(taskletname) \
945 if (rt2x00dev->ops->lib->taskletname) { \
946 tasklet_init(&rt2x00dev->taskletname, \
947 rt2x00dev->ops->lib->taskletname, \
948 (unsigned long)rt2x00dev); \
949 tasklet_disable(&rt2x00dev->taskletname); \
950 }
951
952 RT2X00_TASKLET_INIT(txstatus_tasklet);
953 RT2X00_TASKLET_INIT(pretbtt_tasklet);
954 RT2X00_TASKLET_INIT(tbtt_tasklet);
955 RT2X00_TASKLET_INIT(rxdone_tasklet);
956 RT2X00_TASKLET_INIT(autowake_tasklet);
957
958#undef RT2X00_TASKLET_INIT
959
960 /*
961 * Register HW.
962 */
963 status = ieee80211_register_hw(rt2x00dev->hw);
964 if (status)
965 return status;
966
967 set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
968
969 return 0;
970}
971
972/*
973 * Initialization/uninitialization handlers.
974 */
975static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
976{
977 if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
978 return;
979
980 /*
981 * Unregister extra components.
982 */
983 rt2x00rfkill_unregister(rt2x00dev);
984
985 /*
986 * Allow the HW to uninitialize.
987 */
988 rt2x00dev->ops->lib->uninitialize(rt2x00dev);
989
990 /*
991 * Free allocated queue entries.
992 */
993 rt2x00queue_uninitialize(rt2x00dev);
994}
995
996static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
997{
998 int status;
999
1000 if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1001 return 0;
1002
1003 /*
1004 * Allocate all queue entries.
1005 */
1006 status = rt2x00queue_initialize(rt2x00dev);
1007 if (status)
1008 return status;
1009
1010 /*
1011 * Initialize the device.
1012 */
1013 status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1014 if (status) {
1015 rt2x00queue_uninitialize(rt2x00dev);
1016 return status;
1017 }
1018
1019 set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1020
1021 /*
1022 * Register the extra components.
1023 */
1024 rt2x00rfkill_register(rt2x00dev);
1025
1026 return 0;
1027}
1028
1029int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1030{
1031 int retval;
1032
1033 if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1034 return 0;
1035
1036 /*
1037 * If this is the first interface which is added,
1038 * we should load the firmware now.
1039 */
1040 retval = rt2x00lib_load_firmware(rt2x00dev);
1041 if (retval)
1042 return retval;
1043
1044 /*
1045 * Initialize the device.
1046 */
1047 retval = rt2x00lib_initialize(rt2x00dev);
1048 if (retval)
1049 return retval;
1050
1051 rt2x00dev->intf_ap_count = 0;
1052 rt2x00dev->intf_sta_count = 0;
1053 rt2x00dev->intf_associated = 0;
1054
1055 /* Enable the radio */
1056 retval = rt2x00lib_enable_radio(rt2x00dev);
1057 if (retval)
1058 return retval;
1059
1060 set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1061
1062 return 0;
1063}
1064
1065void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1066{
1067 if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1068 return;
1069
1070 /*
1071 * Perhaps we can add something smarter here,
1072 * but for now just disabling the radio should do.
1073 */
1074 rt2x00lib_disable_radio(rt2x00dev);
1075
1076 rt2x00dev->intf_ap_count = 0;
1077 rt2x00dev->intf_sta_count = 0;
1078 rt2x00dev->intf_associated = 0;
1079}
1080
1081/*
1082 * driver allocation handlers.
1083 */
1084int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1085{
1086 int retval = -ENOMEM;
1087
1088 spin_lock_init(&rt2x00dev->irqmask_lock);
1089 mutex_init(&rt2x00dev->csr_mutex);
1090
1091 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1092
1093 /*
1094 * Make room for rt2x00_intf inside the per-interface
1095 * structure ieee80211_vif.
1096 */
1097 rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1098
1099 /*
1100 * Determine which operating modes are supported, all modes
1101 * which require beaconing, depend on the availability of
1102 * beacon entries.
1103 */
1104 rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1105 if (rt2x00dev->ops->bcn->entry_num > 0)
1106 rt2x00dev->hw->wiphy->interface_modes |=
1107 BIT(NL80211_IFTYPE_ADHOC) |
1108 BIT(NL80211_IFTYPE_AP) |
1109 BIT(NL80211_IFTYPE_MESH_POINT) |
1110 BIT(NL80211_IFTYPE_WDS);
1111
1112 /*
1113 * Initialize work.
1114 */
1115 rt2x00dev->workqueue =
1116 alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1117 if (!rt2x00dev->workqueue) {
1118 retval = -ENOMEM;
1119 goto exit;
1120 }
1121
1122 INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1123 INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1124
1125 /*
1126 * Let the driver probe the device to detect the capabilities.
1127 */
1128 retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1129 if (retval) {
1130 ERROR(rt2x00dev, "Failed to allocate device.\n");
1131 goto exit;
1132 }
1133
1134 /*
1135 * Allocate queue array.
1136 */
1137 retval = rt2x00queue_allocate(rt2x00dev);
1138 if (retval)
1139 goto exit;
1140
1141 /*
1142 * Initialize ieee80211 structure.
1143 */
1144 retval = rt2x00lib_probe_hw(rt2x00dev);
1145 if (retval) {
1146 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1147 goto exit;
1148 }
1149
1150 /*
1151 * Register extra components.
1152 */
1153 rt2x00link_register(rt2x00dev);
1154 rt2x00leds_register(rt2x00dev);
1155 rt2x00debug_register(rt2x00dev);
1156
1157 return 0;
1158
1159exit:
1160 rt2x00lib_remove_dev(rt2x00dev);
1161
1162 return retval;
1163}
1164EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1165
1166void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1167{
1168 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1169
1170 /*
1171 * Disable radio.
1172 */
1173 rt2x00lib_disable_radio(rt2x00dev);
1174
1175 /*
1176 * Stop all work.
1177 */
1178 cancel_work_sync(&rt2x00dev->intf_work);
1179 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1180 if (rt2x00_is_usb(rt2x00dev)) {
1181 del_timer_sync(&rt2x00dev->txstatus_timer);
1182 cancel_work_sync(&rt2x00dev->rxdone_work);
1183 cancel_work_sync(&rt2x00dev->txdone_work);
1184 }
1185 destroy_workqueue(rt2x00dev->workqueue);
1186
1187 /*
1188 * Free the tx status fifo.
1189 */
1190 kfifo_free(&rt2x00dev->txstatus_fifo);
1191
1192 /*
1193 * Kill the tx status tasklet.
1194 */
1195 tasklet_kill(&rt2x00dev->txstatus_tasklet);
1196 tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1197 tasklet_kill(&rt2x00dev->tbtt_tasklet);
1198 tasklet_kill(&rt2x00dev->rxdone_tasklet);
1199 tasklet_kill(&rt2x00dev->autowake_tasklet);
1200
1201 /*
1202 * Uninitialize device.
1203 */
1204 rt2x00lib_uninitialize(rt2x00dev);
1205
1206 /*
1207 * Free extra components
1208 */
1209 rt2x00debug_deregister(rt2x00dev);
1210 rt2x00leds_unregister(rt2x00dev);
1211
1212 /*
1213 * Free ieee80211_hw memory.
1214 */
1215 rt2x00lib_remove_hw(rt2x00dev);
1216
1217 /*
1218 * Free firmware image.
1219 */
1220 rt2x00lib_free_firmware(rt2x00dev);
1221
1222 /*
1223 * Free queue structures.
1224 */
1225 rt2x00queue_free(rt2x00dev);
1226}
1227EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1228
1229/*
1230 * Device state handlers
1231 */
1232#ifdef CONFIG_PM
1233int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1234{
1235 NOTICE(rt2x00dev, "Going to sleep.\n");
1236
1237 /*
1238 * Prevent mac80211 from accessing driver while suspended.
1239 */
1240 if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1241 return 0;
1242
1243 /*
1244 * Cleanup as much as possible.
1245 */
1246 rt2x00lib_uninitialize(rt2x00dev);
1247
1248 /*
1249 * Suspend/disable extra components.
1250 */
1251 rt2x00leds_suspend(rt2x00dev);
1252 rt2x00debug_deregister(rt2x00dev);
1253
1254 /*
1255 * Set device mode to sleep for power management,
1256 * on some hardware this call seems to consistently fail.
1257 * From the specifications it is hard to tell why it fails,
1258 * and if this is a "bad thing".
1259 * Overall it is safe to just ignore the failure and
1260 * continue suspending. The only downside is that the
1261 * device will not be in optimal power save mode, but with
1262 * the radio and the other components already disabled the
1263 * device is as good as disabled.
1264 */
1265 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1266 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1267 "continue suspending.\n");
1268
1269 return 0;
1270}
1271EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1272
1273int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1274{
1275 NOTICE(rt2x00dev, "Waking up.\n");
1276
1277 /*
1278 * Restore/enable extra components.
1279 */
1280 rt2x00debug_register(rt2x00dev);
1281 rt2x00leds_resume(rt2x00dev);
1282
1283 /*
1284 * We are ready again to receive requests from mac80211.
1285 */
1286 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1287
1288 return 0;
1289}
1290EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1291#endif /* CONFIG_PM */
1292
1293/*
1294 * rt2x00lib module information.
1295 */
1296MODULE_AUTHOR(DRV_PROJECT);
1297MODULE_VERSION(DRV_VERSION);
1298MODULE_DESCRIPTION("rt2x00 library");
1299MODULE_LICENSE("GPL");
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 */
36u32 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}
47EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx);
48
49/*
50 * Radio control handlers.
51 */
52int 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
100void 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
129static 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 rt2x00queue_update_beacon(rt2x00dev, vif);
146}
147
148static void rt2x00lib_intf_scheduled(struct work_struct *work)
149{
150 struct rt2x00_dev *rt2x00dev =
151 container_of(work, struct rt2x00_dev, intf_work);
152
153 /*
154 * Iterate over each interface and perform the
155 * requested configurations.
156 */
157 ieee80211_iterate_active_interfaces(rt2x00dev->hw,
158 IEEE80211_IFACE_ITER_RESUME_ALL,
159 rt2x00lib_intf_scheduled_iter,
160 rt2x00dev);
161}
162
163static void rt2x00lib_autowakeup(struct work_struct *work)
164{
165 struct rt2x00_dev *rt2x00dev =
166 container_of(work, struct rt2x00_dev, autowakeup_work.work);
167
168 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
169 return;
170
171 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
172 rt2x00_err(rt2x00dev, "Device failed to wakeup\n");
173 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
174}
175
176/*
177 * Interrupt context handlers.
178 */
179static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
180 struct ieee80211_vif *vif)
181{
182 struct ieee80211_tx_control control = {};
183 struct rt2x00_dev *rt2x00dev = data;
184 struct sk_buff *skb;
185
186 /*
187 * Only AP mode interfaces do broad- and multicast buffering
188 */
189 if (vif->type != NL80211_IFTYPE_AP)
190 return;
191
192 /*
193 * Send out buffered broad- and multicast frames
194 */
195 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
196 while (skb) {
197 rt2x00mac_tx(rt2x00dev->hw, &control, skb);
198 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
199 }
200}
201
202static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
203 struct ieee80211_vif *vif)
204{
205 struct rt2x00_dev *rt2x00dev = data;
206
207 if (vif->type != NL80211_IFTYPE_AP &&
208 vif->type != NL80211_IFTYPE_ADHOC &&
209 vif->type != NL80211_IFTYPE_MESH_POINT &&
210 vif->type != NL80211_IFTYPE_WDS)
211 return;
212
213 /*
214 * Update the beacon without locking. This is safe on PCI devices
215 * as they only update the beacon periodically here. This should
216 * never be called for USB devices.
217 */
218 WARN_ON(rt2x00_is_usb(rt2x00dev));
219 rt2x00queue_update_beacon_locked(rt2x00dev, vif);
220}
221
222void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
223{
224 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
225 return;
226
227 /* send buffered bc/mc frames out for every bssid */
228 ieee80211_iterate_active_interfaces_atomic(
229 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
230 rt2x00lib_bc_buffer_iter, rt2x00dev);
231 /*
232 * Devices with pre tbtt interrupt don't need to update the beacon
233 * here as they will fetch the next beacon directly prior to
234 * transmission.
235 */
236 if (rt2x00_has_cap_pre_tbtt_interrupt(rt2x00dev))
237 return;
238
239 /* fetch next beacon */
240 ieee80211_iterate_active_interfaces_atomic(
241 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
242 rt2x00lib_beaconupdate_iter, rt2x00dev);
243}
244EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
245
246void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
247{
248 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
249 return;
250
251 /* fetch next beacon */
252 ieee80211_iterate_active_interfaces_atomic(
253 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
254 rt2x00lib_beaconupdate_iter, rt2x00dev);
255}
256EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
257
258void rt2x00lib_dmastart(struct queue_entry *entry)
259{
260 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
261 rt2x00queue_index_inc(entry, Q_INDEX);
262}
263EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
264
265void rt2x00lib_dmadone(struct queue_entry *entry)
266{
267 set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
268 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
269 rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
270}
271EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
272
273static inline int rt2x00lib_txdone_bar_status(struct queue_entry *entry)
274{
275 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
276 struct ieee80211_bar *bar = (void *) entry->skb->data;
277 struct rt2x00_bar_list_entry *bar_entry;
278 int ret;
279
280 if (likely(!ieee80211_is_back_req(bar->frame_control)))
281 return 0;
282
283 /*
284 * Unlike all other frames, the status report for BARs does
285 * not directly come from the hardware as it is incapable of
286 * matching a BA to a previously send BAR. The hardware will
287 * report all BARs as if they weren't acked at all.
288 *
289 * Instead the RX-path will scan for incoming BAs and set the
290 * block_acked flag if it sees one that was likely caused by
291 * a BAR from us.
292 *
293 * Remove remaining BARs here and return their status for
294 * TX done processing.
295 */
296 ret = 0;
297 rcu_read_lock();
298 list_for_each_entry_rcu(bar_entry, &rt2x00dev->bar_list, list) {
299 if (bar_entry->entry != entry)
300 continue;
301
302 spin_lock_bh(&rt2x00dev->bar_list_lock);
303 /* Return whether this BAR was blockacked or not */
304 ret = bar_entry->block_acked;
305 /* Remove the BAR from our checklist */
306 list_del_rcu(&bar_entry->list);
307 spin_unlock_bh(&rt2x00dev->bar_list_lock);
308 kfree_rcu(bar_entry, head);
309
310 break;
311 }
312 rcu_read_unlock();
313
314 return ret;
315}
316
317void rt2x00lib_txdone(struct queue_entry *entry,
318 struct txdone_entry_desc *txdesc)
319{
320 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
321 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
322 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
323 unsigned int header_length, i;
324 u8 rate_idx, rate_flags, retry_rates;
325 u8 skbdesc_flags = skbdesc->flags;
326 bool success;
327
328 /*
329 * Unmap the skb.
330 */
331 rt2x00queue_unmap_skb(entry);
332
333 /*
334 * Remove the extra tx headroom from the skb.
335 */
336 skb_pull(entry->skb, rt2x00dev->extra_tx_headroom);
337
338 /*
339 * Signal that the TX descriptor is no longer in the skb.
340 */
341 skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
342
343 /*
344 * Determine the length of 802.11 header.
345 */
346 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
347
348 /*
349 * Remove L2 padding which was added during
350 */
351 if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
352 rt2x00queue_remove_l2pad(entry->skb, header_length);
353
354 /*
355 * If the IV/EIV data was stripped from the frame before it was
356 * passed to the hardware, we should now reinsert it again because
357 * mac80211 will expect the same data to be present it the
358 * frame as it was passed to us.
359 */
360 if (rt2x00_has_cap_hw_crypto(rt2x00dev))
361 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
362
363 /*
364 * Send frame to debugfs immediately, after this call is completed
365 * we are going to overwrite the skb->cb array.
366 */
367 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
368
369 /*
370 * Determine if the frame has been successfully transmitted and
371 * remove BARs from our check list while checking for their
372 * TX status.
373 */
374 success =
375 rt2x00lib_txdone_bar_status(entry) ||
376 test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
377 test_bit(TXDONE_UNKNOWN, &txdesc->flags);
378
379 /*
380 * Update TX statistics.
381 */
382 rt2x00dev->link.qual.tx_success += success;
383 rt2x00dev->link.qual.tx_failed += !success;
384
385 rate_idx = skbdesc->tx_rate_idx;
386 rate_flags = skbdesc->tx_rate_flags;
387 retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
388 (txdesc->retry + 1) : 1;
389
390 /*
391 * Initialize TX status
392 */
393 memset(&tx_info->status, 0, sizeof(tx_info->status));
394 tx_info->status.ack_signal = 0;
395
396 /*
397 * Frame was send with retries, hardware tried
398 * different rates to send out the frame, at each
399 * retry it lowered the rate 1 step except when the
400 * lowest rate was used.
401 */
402 for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
403 tx_info->status.rates[i].idx = rate_idx - i;
404 tx_info->status.rates[i].flags = rate_flags;
405
406 if (rate_idx - i == 0) {
407 /*
408 * The lowest rate (index 0) was used until the
409 * number of max retries was reached.
410 */
411 tx_info->status.rates[i].count = retry_rates - i;
412 i++;
413 break;
414 }
415 tx_info->status.rates[i].count = 1;
416 }
417 if (i < (IEEE80211_TX_MAX_RATES - 1))
418 tx_info->status.rates[i].idx = -1; /* terminate */
419
420 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
421 if (success)
422 tx_info->flags |= IEEE80211_TX_STAT_ACK;
423 else
424 rt2x00dev->low_level_stats.dot11ACKFailureCount++;
425 }
426
427 /*
428 * Every single frame has it's own tx status, hence report
429 * every frame as ampdu of size 1.
430 *
431 * TODO: if we can find out how many frames were aggregated
432 * by the hw we could provide the real ampdu_len to mac80211
433 * which would allow the rc algorithm to better decide on
434 * which rates are suitable.
435 */
436 if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
437 tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
438 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
439 tx_info->status.ampdu_len = 1;
440 tx_info->status.ampdu_ack_len = success ? 1 : 0;
441
442 if (!success)
443 tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
444 }
445
446 if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
447 if (success)
448 rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
449 else
450 rt2x00dev->low_level_stats.dot11RTSFailureCount++;
451 }
452
453 /*
454 * Only send the status report to mac80211 when it's a frame
455 * that originated in mac80211. If this was a extra frame coming
456 * through a mac80211 library call (RTS/CTS) then we should not
457 * send the status report back.
458 */
459 if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
460 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
461 ieee80211_tx_status(rt2x00dev->hw, entry->skb);
462 else
463 ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
464 } else
465 dev_kfree_skb_any(entry->skb);
466
467 /*
468 * Make this entry available for reuse.
469 */
470 entry->skb = NULL;
471 entry->flags = 0;
472
473 rt2x00dev->ops->lib->clear_entry(entry);
474
475 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
476
477 /*
478 * If the data queue was below the threshold before the txdone
479 * handler we must make sure the packet queue in the mac80211 stack
480 * is reenabled when the txdone handler has finished. This has to be
481 * serialized with rt2x00mac_tx(), otherwise we can wake up queue
482 * before it was stopped.
483 */
484 spin_lock_bh(&entry->queue->tx_lock);
485 if (!rt2x00queue_threshold(entry->queue))
486 rt2x00queue_unpause_queue(entry->queue);
487 spin_unlock_bh(&entry->queue->tx_lock);
488}
489EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
490
491void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
492{
493 struct txdone_entry_desc txdesc;
494
495 txdesc.flags = 0;
496 __set_bit(status, &txdesc.flags);
497 txdesc.retry = 0;
498
499 rt2x00lib_txdone(entry, &txdesc);
500}
501EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
502
503static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
504{
505 struct ieee80211_mgmt *mgmt = (void *)data;
506 u8 *pos, *end;
507
508 pos = (u8 *)mgmt->u.beacon.variable;
509 end = data + len;
510 while (pos < end) {
511 if (pos + 2 + pos[1] > end)
512 return NULL;
513
514 if (pos[0] == ie)
515 return pos;
516
517 pos += 2 + pos[1];
518 }
519
520 return NULL;
521}
522
523static void rt2x00lib_sleep(struct work_struct *work)
524{
525 struct rt2x00_dev *rt2x00dev =
526 container_of(work, struct rt2x00_dev, sleep_work);
527
528 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
529 return;
530
531 /*
532 * Check again is powersaving is enabled, to prevent races from delayed
533 * work execution.
534 */
535 if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
536 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
537 IEEE80211_CONF_CHANGE_PS);
538}
539
540static void rt2x00lib_rxdone_check_ba(struct rt2x00_dev *rt2x00dev,
541 struct sk_buff *skb,
542 struct rxdone_entry_desc *rxdesc)
543{
544 struct rt2x00_bar_list_entry *entry;
545 struct ieee80211_bar *ba = (void *)skb->data;
546
547 if (likely(!ieee80211_is_back(ba->frame_control)))
548 return;
549
550 if (rxdesc->size < sizeof(*ba) + FCS_LEN)
551 return;
552
553 rcu_read_lock();
554 list_for_each_entry_rcu(entry, &rt2x00dev->bar_list, list) {
555
556 if (ba->start_seq_num != entry->start_seq_num)
557 continue;
558
559#define TID_CHECK(a, b) ( \
560 ((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) == \
561 ((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK))) \
562
563 if (!TID_CHECK(ba->control, entry->control))
564 continue;
565
566#undef TID_CHECK
567
568 if (!ether_addr_equal_64bits(ba->ra, entry->ta))
569 continue;
570
571 if (!ether_addr_equal_64bits(ba->ta, entry->ra))
572 continue;
573
574 /* Mark BAR since we received the according BA */
575 spin_lock_bh(&rt2x00dev->bar_list_lock);
576 entry->block_acked = 1;
577 spin_unlock_bh(&rt2x00dev->bar_list_lock);
578 break;
579 }
580 rcu_read_unlock();
581
582}
583
584static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
585 struct sk_buff *skb,
586 struct rxdone_entry_desc *rxdesc)
587{
588 struct ieee80211_hdr *hdr = (void *) skb->data;
589 struct ieee80211_tim_ie *tim_ie;
590 u8 *tim;
591 u8 tim_len;
592 bool cam;
593
594 /* If this is not a beacon, or if mac80211 has no powersaving
595 * configured, or if the device is already in powersaving mode
596 * we can exit now. */
597 if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
598 !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
599 return;
600
601 /* min. beacon length + FCS_LEN */
602 if (skb->len <= 40 + FCS_LEN)
603 return;
604
605 /* and only beacons from the associated BSSID, please */
606 if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
607 !rt2x00dev->aid)
608 return;
609
610 rt2x00dev->last_beacon = jiffies;
611
612 tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
613 if (!tim)
614 return;
615
616 if (tim[1] < sizeof(*tim_ie))
617 return;
618
619 tim_len = tim[1];
620 tim_ie = (struct ieee80211_tim_ie *) &tim[2];
621
622 /* Check whenever the PHY can be turned off again. */
623
624 /* 1. What about buffered unicast traffic for our AID? */
625 cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
626
627 /* 2. Maybe the AP wants to send multicast/broadcast data? */
628 cam |= (tim_ie->bitmap_ctrl & 0x01);
629
630 if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
631 queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
632}
633
634static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
635 struct rxdone_entry_desc *rxdesc)
636{
637 struct ieee80211_supported_band *sband;
638 const struct rt2x00_rate *rate;
639 unsigned int i;
640 int signal = rxdesc->signal;
641 int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
642
643 switch (rxdesc->rate_mode) {
644 case RATE_MODE_CCK:
645 case RATE_MODE_OFDM:
646 /*
647 * For non-HT rates the MCS value needs to contain the
648 * actually used rate modulation (CCK or OFDM).
649 */
650 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
651 signal = RATE_MCS(rxdesc->rate_mode, signal);
652
653 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
654 for (i = 0; i < sband->n_bitrates; i++) {
655 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
656 if (((type == RXDONE_SIGNAL_PLCP) &&
657 (rate->plcp == signal)) ||
658 ((type == RXDONE_SIGNAL_BITRATE) &&
659 (rate->bitrate == signal)) ||
660 ((type == RXDONE_SIGNAL_MCS) &&
661 (rate->mcs == signal))) {
662 return i;
663 }
664 }
665 break;
666 case RATE_MODE_HT_MIX:
667 case RATE_MODE_HT_GREENFIELD:
668 if (signal >= 0 && signal <= 76)
669 return signal;
670 break;
671 default:
672 break;
673 }
674
675 rt2x00_warn(rt2x00dev, "Frame received with unrecognized signal, mode=0x%.4x, signal=0x%.4x, type=%d\n",
676 rxdesc->rate_mode, signal, type);
677 return 0;
678}
679
680void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
681{
682 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
683 struct rxdone_entry_desc rxdesc;
684 struct sk_buff *skb;
685 struct ieee80211_rx_status *rx_status;
686 unsigned int header_length;
687 int rate_idx;
688
689 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
690 !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
691 goto submit_entry;
692
693 if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
694 goto submit_entry;
695
696 /*
697 * Allocate a new sk_buffer. If no new buffer available, drop the
698 * received frame and reuse the existing buffer.
699 */
700 skb = rt2x00queue_alloc_rxskb(entry, gfp);
701 if (!skb)
702 goto submit_entry;
703
704 /*
705 * Unmap the skb.
706 */
707 rt2x00queue_unmap_skb(entry);
708
709 /*
710 * Extract the RXD details.
711 */
712 memset(&rxdesc, 0, sizeof(rxdesc));
713 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
714
715 /*
716 * Check for valid size in case we get corrupted descriptor from
717 * hardware.
718 */
719 if (unlikely(rxdesc.size == 0 ||
720 rxdesc.size > entry->queue->data_size)) {
721 rt2x00_err(rt2x00dev, "Wrong frame size %d max %d\n",
722 rxdesc.size, entry->queue->data_size);
723 dev_kfree_skb(entry->skb);
724 goto renew_skb;
725 }
726
727 /*
728 * The data behind the ieee80211 header must be
729 * aligned on a 4 byte boundary.
730 */
731 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
732
733 /*
734 * Hardware might have stripped the IV/EIV/ICV data,
735 * in that case it is possible that the data was
736 * provided separately (through hardware descriptor)
737 * in which case we should reinsert the data into the frame.
738 */
739 if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
740 (rxdesc.flags & RX_FLAG_IV_STRIPPED))
741 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
742 &rxdesc);
743 else if (header_length &&
744 (rxdesc.size > header_length) &&
745 (rxdesc.dev_flags & RXDONE_L2PAD))
746 rt2x00queue_remove_l2pad(entry->skb, header_length);
747
748 /* Trim buffer to correct size */
749 skb_trim(entry->skb, rxdesc.size);
750
751 /*
752 * Translate the signal to the correct bitrate index.
753 */
754 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
755 if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
756 rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
757 rxdesc.flags |= RX_FLAG_HT;
758
759 /*
760 * Check if this is a beacon, and more frames have been
761 * buffered while we were in powersaving mode.
762 */
763 rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
764
765 /*
766 * Check for incoming BlockAcks to match to the BlockAckReqs
767 * we've send out.
768 */
769 rt2x00lib_rxdone_check_ba(rt2x00dev, entry->skb, &rxdesc);
770
771 /*
772 * Update extra components
773 */
774 rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
775 rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
776 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
777
778 /*
779 * Initialize RX status information, and send frame
780 * to mac80211.
781 */
782 rx_status = IEEE80211_SKB_RXCB(entry->skb);
783
784 /* Ensure that all fields of rx_status are initialized
785 * properly. The skb->cb array was used for driver
786 * specific informations, so rx_status might contain
787 * garbage.
788 */
789 memset(rx_status, 0, sizeof(*rx_status));
790
791 rx_status->mactime = rxdesc.timestamp;
792 rx_status->band = rt2x00dev->curr_band;
793 rx_status->freq = rt2x00dev->curr_freq;
794 rx_status->rate_idx = rate_idx;
795 rx_status->signal = rxdesc.rssi;
796 rx_status->flag = rxdesc.flags;
797 rx_status->antenna = rt2x00dev->link.ant.active.rx;
798
799 ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
800
801renew_skb:
802 /*
803 * Replace the skb with the freshly allocated one.
804 */
805 entry->skb = skb;
806
807submit_entry:
808 entry->flags = 0;
809 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
810 if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
811 test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
812 rt2x00dev->ops->lib->clear_entry(entry);
813}
814EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
815
816/*
817 * Driver initialization handlers.
818 */
819const struct rt2x00_rate rt2x00_supported_rates[12] = {
820 {
821 .flags = DEV_RATE_CCK,
822 .bitrate = 10,
823 .ratemask = BIT(0),
824 .plcp = 0x00,
825 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
826 },
827 {
828 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
829 .bitrate = 20,
830 .ratemask = BIT(1),
831 .plcp = 0x01,
832 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
833 },
834 {
835 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
836 .bitrate = 55,
837 .ratemask = BIT(2),
838 .plcp = 0x02,
839 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
840 },
841 {
842 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
843 .bitrate = 110,
844 .ratemask = BIT(3),
845 .plcp = 0x03,
846 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
847 },
848 {
849 .flags = DEV_RATE_OFDM,
850 .bitrate = 60,
851 .ratemask = BIT(4),
852 .plcp = 0x0b,
853 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
854 },
855 {
856 .flags = DEV_RATE_OFDM,
857 .bitrate = 90,
858 .ratemask = BIT(5),
859 .plcp = 0x0f,
860 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
861 },
862 {
863 .flags = DEV_RATE_OFDM,
864 .bitrate = 120,
865 .ratemask = BIT(6),
866 .plcp = 0x0a,
867 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
868 },
869 {
870 .flags = DEV_RATE_OFDM,
871 .bitrate = 180,
872 .ratemask = BIT(7),
873 .plcp = 0x0e,
874 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
875 },
876 {
877 .flags = DEV_RATE_OFDM,
878 .bitrate = 240,
879 .ratemask = BIT(8),
880 .plcp = 0x09,
881 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
882 },
883 {
884 .flags = DEV_RATE_OFDM,
885 .bitrate = 360,
886 .ratemask = BIT(9),
887 .plcp = 0x0d,
888 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
889 },
890 {
891 .flags = DEV_RATE_OFDM,
892 .bitrate = 480,
893 .ratemask = BIT(10),
894 .plcp = 0x08,
895 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
896 },
897 {
898 .flags = DEV_RATE_OFDM,
899 .bitrate = 540,
900 .ratemask = BIT(11),
901 .plcp = 0x0c,
902 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
903 },
904};
905
906static void rt2x00lib_channel(struct ieee80211_channel *entry,
907 const int channel, const int tx_power,
908 const int value)
909{
910 /* XXX: this assumption about the band is wrong for 802.11j */
911 entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
912 entry->center_freq = ieee80211_channel_to_frequency(channel,
913 entry->band);
914 entry->hw_value = value;
915 entry->max_power = tx_power;
916 entry->max_antenna_gain = 0xff;
917}
918
919static void rt2x00lib_rate(struct ieee80211_rate *entry,
920 const u16 index, const struct rt2x00_rate *rate)
921{
922 entry->flags = 0;
923 entry->bitrate = rate->bitrate;
924 entry->hw_value = index;
925 entry->hw_value_short = index;
926
927 if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
928 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
929}
930
931static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
932 struct hw_mode_spec *spec)
933{
934 struct ieee80211_hw *hw = rt2x00dev->hw;
935 struct ieee80211_channel *channels;
936 struct ieee80211_rate *rates;
937 unsigned int num_rates;
938 unsigned int i;
939
940 num_rates = 0;
941 if (spec->supported_rates & SUPPORT_RATE_CCK)
942 num_rates += 4;
943 if (spec->supported_rates & SUPPORT_RATE_OFDM)
944 num_rates += 8;
945
946 channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
947 if (!channels)
948 return -ENOMEM;
949
950 rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
951 if (!rates)
952 goto exit_free_channels;
953
954 /*
955 * Initialize Rate list.
956 */
957 for (i = 0; i < num_rates; i++)
958 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
959
960 /*
961 * Initialize Channel list.
962 */
963 for (i = 0; i < spec->num_channels; i++) {
964 rt2x00lib_channel(&channels[i],
965 spec->channels[i].channel,
966 spec->channels_info[i].max_power, i);
967 }
968
969 /*
970 * Intitialize 802.11b, 802.11g
971 * Rates: CCK, OFDM.
972 * Channels: 2.4 GHz
973 */
974 if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
975 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
976 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
977 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
978 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
979 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
980 &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
981 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
982 &spec->ht, sizeof(spec->ht));
983 }
984
985 /*
986 * Intitialize 802.11a
987 * Rates: OFDM.
988 * Channels: OFDM, UNII, HiperLAN2.
989 */
990 if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
991 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
992 spec->num_channels - 14;
993 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
994 num_rates - 4;
995 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
996 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
997 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
998 &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
999 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
1000 &spec->ht, sizeof(spec->ht));
1001 }
1002
1003 return 0;
1004
1005 exit_free_channels:
1006 kfree(channels);
1007 rt2x00_err(rt2x00dev, "Allocation ieee80211 modes failed\n");
1008 return -ENOMEM;
1009}
1010
1011static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
1012{
1013 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1014 ieee80211_unregister_hw(rt2x00dev->hw);
1015
1016 if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
1017 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
1018 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
1019 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
1020 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
1021 }
1022
1023 kfree(rt2x00dev->spec.channels_info);
1024}
1025
1026static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
1027{
1028 struct hw_mode_spec *spec = &rt2x00dev->spec;
1029 int status;
1030
1031 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
1032 return 0;
1033
1034 /*
1035 * Initialize HW modes.
1036 */
1037 status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
1038 if (status)
1039 return status;
1040
1041 /*
1042 * Initialize HW fields.
1043 */
1044 rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
1045
1046 /*
1047 * Initialize extra TX headroom required.
1048 */
1049 rt2x00dev->hw->extra_tx_headroom =
1050 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
1051 rt2x00dev->extra_tx_headroom);
1052
1053 /*
1054 * Take TX headroom required for alignment into account.
1055 */
1056 if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
1057 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
1058 else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
1059 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
1060
1061 /*
1062 * Tell mac80211 about the size of our private STA structure.
1063 */
1064 rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
1065
1066 /*
1067 * Allocate tx status FIFO for driver use.
1068 */
1069 if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
1070 /*
1071 * Allocate the txstatus fifo. In the worst case the tx
1072 * status fifo has to hold the tx status of all entries
1073 * in all tx queues. Hence, calculate the kfifo size as
1074 * tx_queues * entry_num and round up to the nearest
1075 * power of 2.
1076 */
1077 int kfifo_size =
1078 roundup_pow_of_two(rt2x00dev->ops->tx_queues *
1079 rt2x00dev->tx->limit *
1080 sizeof(u32));
1081
1082 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
1083 GFP_KERNEL);
1084 if (status)
1085 return status;
1086 }
1087
1088 /*
1089 * Initialize tasklets if used by the driver. Tasklets are
1090 * disabled until the interrupts are turned on. The driver
1091 * has to handle that.
1092 */
1093#define RT2X00_TASKLET_INIT(taskletname) \
1094 if (rt2x00dev->ops->lib->taskletname) { \
1095 tasklet_init(&rt2x00dev->taskletname, \
1096 rt2x00dev->ops->lib->taskletname, \
1097 (unsigned long)rt2x00dev); \
1098 }
1099
1100 RT2X00_TASKLET_INIT(txstatus_tasklet);
1101 RT2X00_TASKLET_INIT(pretbtt_tasklet);
1102 RT2X00_TASKLET_INIT(tbtt_tasklet);
1103 RT2X00_TASKLET_INIT(rxdone_tasklet);
1104 RT2X00_TASKLET_INIT(autowake_tasklet);
1105
1106#undef RT2X00_TASKLET_INIT
1107
1108 /*
1109 * Register HW.
1110 */
1111 status = ieee80211_register_hw(rt2x00dev->hw);
1112 if (status)
1113 return status;
1114
1115 set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
1116
1117 return 0;
1118}
1119
1120/*
1121 * Initialization/uninitialization handlers.
1122 */
1123static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
1124{
1125 if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1126 return;
1127
1128 /*
1129 * Unregister extra components.
1130 */
1131 rt2x00rfkill_unregister(rt2x00dev);
1132
1133 /*
1134 * Allow the HW to uninitialize.
1135 */
1136 rt2x00dev->ops->lib->uninitialize(rt2x00dev);
1137
1138 /*
1139 * Free allocated queue entries.
1140 */
1141 rt2x00queue_uninitialize(rt2x00dev);
1142}
1143
1144static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
1145{
1146 int status;
1147
1148 if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1149 return 0;
1150
1151 /*
1152 * Allocate all queue entries.
1153 */
1154 status = rt2x00queue_initialize(rt2x00dev);
1155 if (status)
1156 return status;
1157
1158 /*
1159 * Initialize the device.
1160 */
1161 status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1162 if (status) {
1163 rt2x00queue_uninitialize(rt2x00dev);
1164 return status;
1165 }
1166
1167 set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1168
1169 return 0;
1170}
1171
1172int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1173{
1174 int retval;
1175
1176 if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1177 return 0;
1178
1179 /*
1180 * If this is the first interface which is added,
1181 * we should load the firmware now.
1182 */
1183 retval = rt2x00lib_load_firmware(rt2x00dev);
1184 if (retval)
1185 return retval;
1186
1187 /*
1188 * Initialize the device.
1189 */
1190 retval = rt2x00lib_initialize(rt2x00dev);
1191 if (retval)
1192 return retval;
1193
1194 rt2x00dev->intf_ap_count = 0;
1195 rt2x00dev->intf_sta_count = 0;
1196 rt2x00dev->intf_associated = 0;
1197
1198 /* Enable the radio */
1199 retval = rt2x00lib_enable_radio(rt2x00dev);
1200 if (retval)
1201 return retval;
1202
1203 set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1204
1205 return 0;
1206}
1207
1208void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1209{
1210 if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1211 return;
1212
1213 /*
1214 * Perhaps we can add something smarter here,
1215 * but for now just disabling the radio should do.
1216 */
1217 rt2x00lib_disable_radio(rt2x00dev);
1218
1219 rt2x00dev->intf_ap_count = 0;
1220 rt2x00dev->intf_sta_count = 0;
1221 rt2x00dev->intf_associated = 0;
1222}
1223
1224static inline void rt2x00lib_set_if_combinations(struct rt2x00_dev *rt2x00dev)
1225{
1226 struct ieee80211_iface_limit *if_limit;
1227 struct ieee80211_iface_combination *if_combination;
1228
1229 if (rt2x00dev->ops->max_ap_intf < 2)
1230 return;
1231
1232 /*
1233 * Build up AP interface limits structure.
1234 */
1235 if_limit = &rt2x00dev->if_limits_ap;
1236 if_limit->max = rt2x00dev->ops->max_ap_intf;
1237 if_limit->types = BIT(NL80211_IFTYPE_AP);
1238#ifdef CONFIG_MAC80211_MESH
1239 if_limit->types |= BIT(NL80211_IFTYPE_MESH_POINT);
1240#endif
1241
1242 /*
1243 * Build up AP interface combinations structure.
1244 */
1245 if_combination = &rt2x00dev->if_combinations[IF_COMB_AP];
1246 if_combination->limits = if_limit;
1247 if_combination->n_limits = 1;
1248 if_combination->max_interfaces = if_limit->max;
1249 if_combination->num_different_channels = 1;
1250
1251 /*
1252 * Finally, specify the possible combinations to mac80211.
1253 */
1254 rt2x00dev->hw->wiphy->iface_combinations = rt2x00dev->if_combinations;
1255 rt2x00dev->hw->wiphy->n_iface_combinations = 1;
1256}
1257
1258static unsigned int rt2x00dev_extra_tx_headroom(struct rt2x00_dev *rt2x00dev)
1259{
1260 if (WARN_ON(!rt2x00dev->tx))
1261 return 0;
1262
1263 if (rt2x00_is_usb(rt2x00dev))
1264 return rt2x00dev->tx[0].winfo_size + rt2x00dev->tx[0].desc_size;
1265
1266 return rt2x00dev->tx[0].winfo_size;
1267}
1268
1269/*
1270 * driver allocation handlers.
1271 */
1272int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1273{
1274 int retval = -ENOMEM;
1275
1276 /*
1277 * Set possible interface combinations.
1278 */
1279 rt2x00lib_set_if_combinations(rt2x00dev);
1280
1281 /*
1282 * Allocate the driver data memory, if necessary.
1283 */
1284 if (rt2x00dev->ops->drv_data_size > 0) {
1285 rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
1286 GFP_KERNEL);
1287 if (!rt2x00dev->drv_data) {
1288 retval = -ENOMEM;
1289 goto exit;
1290 }
1291 }
1292
1293 spin_lock_init(&rt2x00dev->irqmask_lock);
1294 mutex_init(&rt2x00dev->csr_mutex);
1295 INIT_LIST_HEAD(&rt2x00dev->bar_list);
1296 spin_lock_init(&rt2x00dev->bar_list_lock);
1297
1298 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1299
1300 /*
1301 * Make room for rt2x00_intf inside the per-interface
1302 * structure ieee80211_vif.
1303 */
1304 rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1305
1306 /*
1307 * rt2x00 devices can only use the last n bits of the MAC address
1308 * for virtual interfaces.
1309 */
1310 rt2x00dev->hw->wiphy->addr_mask[ETH_ALEN - 1] =
1311 (rt2x00dev->ops->max_ap_intf - 1);
1312
1313 /*
1314 * Initialize work.
1315 */
1316 rt2x00dev->workqueue =
1317 alloc_ordered_workqueue("%s", 0, wiphy_name(rt2x00dev->hw->wiphy));
1318 if (!rt2x00dev->workqueue) {
1319 retval = -ENOMEM;
1320 goto exit;
1321 }
1322
1323 INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1324 INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1325 INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
1326
1327 /*
1328 * Let the driver probe the device to detect the capabilities.
1329 */
1330 retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1331 if (retval) {
1332 rt2x00_err(rt2x00dev, "Failed to allocate device\n");
1333 goto exit;
1334 }
1335
1336 /*
1337 * Allocate queue array.
1338 */
1339 retval = rt2x00queue_allocate(rt2x00dev);
1340 if (retval)
1341 goto exit;
1342
1343 /* Cache TX headroom value */
1344 rt2x00dev->extra_tx_headroom = rt2x00dev_extra_tx_headroom(rt2x00dev);
1345
1346 /*
1347 * Determine which operating modes are supported, all modes
1348 * which require beaconing, depend on the availability of
1349 * beacon entries.
1350 */
1351 rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1352 if (rt2x00dev->bcn->limit > 0)
1353 rt2x00dev->hw->wiphy->interface_modes |=
1354 BIT(NL80211_IFTYPE_ADHOC) |
1355 BIT(NL80211_IFTYPE_AP) |
1356#ifdef CONFIG_MAC80211_MESH
1357 BIT(NL80211_IFTYPE_MESH_POINT) |
1358#endif
1359 BIT(NL80211_IFTYPE_WDS);
1360
1361 rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
1362
1363 /*
1364 * Initialize ieee80211 structure.
1365 */
1366 retval = rt2x00lib_probe_hw(rt2x00dev);
1367 if (retval) {
1368 rt2x00_err(rt2x00dev, "Failed to initialize hw\n");
1369 goto exit;
1370 }
1371
1372 /*
1373 * Register extra components.
1374 */
1375 rt2x00link_register(rt2x00dev);
1376 rt2x00leds_register(rt2x00dev);
1377 rt2x00debug_register(rt2x00dev);
1378 rt2x00rfkill_register(rt2x00dev);
1379
1380 return 0;
1381
1382exit:
1383 rt2x00lib_remove_dev(rt2x00dev);
1384
1385 return retval;
1386}
1387EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1388
1389void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1390{
1391 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1392
1393 /*
1394 * Disable radio.
1395 */
1396 rt2x00lib_disable_radio(rt2x00dev);
1397
1398 /*
1399 * Stop all work.
1400 */
1401 cancel_work_sync(&rt2x00dev->intf_work);
1402 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1403 cancel_work_sync(&rt2x00dev->sleep_work);
1404 if (rt2x00_is_usb(rt2x00dev)) {
1405 hrtimer_cancel(&rt2x00dev->txstatus_timer);
1406 cancel_work_sync(&rt2x00dev->rxdone_work);
1407 cancel_work_sync(&rt2x00dev->txdone_work);
1408 }
1409 if (rt2x00dev->workqueue)
1410 destroy_workqueue(rt2x00dev->workqueue);
1411
1412 /*
1413 * Free the tx status fifo.
1414 */
1415 kfifo_free(&rt2x00dev->txstatus_fifo);
1416
1417 /*
1418 * Kill the tx status tasklet.
1419 */
1420 tasklet_kill(&rt2x00dev->txstatus_tasklet);
1421 tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1422 tasklet_kill(&rt2x00dev->tbtt_tasklet);
1423 tasklet_kill(&rt2x00dev->rxdone_tasklet);
1424 tasklet_kill(&rt2x00dev->autowake_tasklet);
1425
1426 /*
1427 * Uninitialize device.
1428 */
1429 rt2x00lib_uninitialize(rt2x00dev);
1430
1431 /*
1432 * Free extra components
1433 */
1434 rt2x00debug_deregister(rt2x00dev);
1435 rt2x00leds_unregister(rt2x00dev);
1436
1437 /*
1438 * Free ieee80211_hw memory.
1439 */
1440 rt2x00lib_remove_hw(rt2x00dev);
1441
1442 /*
1443 * Free firmware image.
1444 */
1445 rt2x00lib_free_firmware(rt2x00dev);
1446
1447 /*
1448 * Free queue structures.
1449 */
1450 rt2x00queue_free(rt2x00dev);
1451
1452 /*
1453 * Free the driver data.
1454 */
1455 if (rt2x00dev->drv_data)
1456 kfree(rt2x00dev->drv_data);
1457}
1458EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1459
1460/*
1461 * Device state handlers
1462 */
1463#ifdef CONFIG_PM
1464int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1465{
1466 rt2x00_dbg(rt2x00dev, "Going to sleep\n");
1467
1468 /*
1469 * Prevent mac80211 from accessing driver while suspended.
1470 */
1471 if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1472 return 0;
1473
1474 /*
1475 * Cleanup as much as possible.
1476 */
1477 rt2x00lib_uninitialize(rt2x00dev);
1478
1479 /*
1480 * Suspend/disable extra components.
1481 */
1482 rt2x00leds_suspend(rt2x00dev);
1483 rt2x00debug_deregister(rt2x00dev);
1484
1485 /*
1486 * Set device mode to sleep for power management,
1487 * on some hardware this call seems to consistently fail.
1488 * From the specifications it is hard to tell why it fails,
1489 * and if this is a "bad thing".
1490 * Overall it is safe to just ignore the failure and
1491 * continue suspending. The only downside is that the
1492 * device will not be in optimal power save mode, but with
1493 * the radio and the other components already disabled the
1494 * device is as good as disabled.
1495 */
1496 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1497 rt2x00_warn(rt2x00dev, "Device failed to enter sleep state, continue suspending\n");
1498
1499 return 0;
1500}
1501EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1502
1503int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1504{
1505 rt2x00_dbg(rt2x00dev, "Waking up\n");
1506
1507 /*
1508 * Restore/enable extra components.
1509 */
1510 rt2x00debug_register(rt2x00dev);
1511 rt2x00leds_resume(rt2x00dev);
1512
1513 /*
1514 * We are ready again to receive requests from mac80211.
1515 */
1516 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1517
1518 return 0;
1519}
1520EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1521#endif /* CONFIG_PM */
1522
1523/*
1524 * rt2x00lib module information.
1525 */
1526MODULE_AUTHOR(DRV_PROJECT);
1527MODULE_VERSION(DRV_VERSION);
1528MODULE_DESCRIPTION("rt2x00 library");
1529MODULE_LICENSE("GPL");