2 Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the
17 Free Software Foundation, Inc.,
18 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 Abstract: rt2x00 generic device routines.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
30 #include "rt2x00lib.h"
33 * Link tuning handlers
35 void rt2x00lib_reset_link_tuner(struct rt2x00_dev
*rt2x00dev
)
37 if (!test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
41 * Reset link information.
42 * Both the currently active vgc level as well as
43 * the link tuner counter should be reset. Resetting
44 * the counter is important for devices where the
45 * device should only perform link tuning during the
46 * first minute after being enabled.
48 rt2x00dev
->link
.count
= 0;
49 rt2x00dev
->link
.vgc_level
= 0;
52 * Reset the link tuner.
54 rt2x00dev
->ops
->lib
->reset_tuner(rt2x00dev
);
57 static void rt2x00lib_start_link_tuner(struct rt2x00_dev
*rt2x00dev
)
60 * Clear all (possibly) pre-existing quality statistics.
62 memset(&rt2x00dev
->link
.qual
, 0, sizeof(rt2x00dev
->link
.qual
));
65 * The RX and TX percentage should start at 50%
66 * this will assure we will get at least get some
67 * decent value when the link tuner starts.
68 * The value will be dropped and overwritten with
69 * the correct (measured )value anyway during the
70 * first run of the link tuner.
72 rt2x00dev
->link
.qual
.rx_percentage
= 50;
73 rt2x00dev
->link
.qual
.tx_percentage
= 50;
75 rt2x00lib_reset_link_tuner(rt2x00dev
);
77 queue_delayed_work(rt2x00dev
->hw
->workqueue
,
78 &rt2x00dev
->link
.work
, LINK_TUNE_INTERVAL
);
81 static void rt2x00lib_stop_link_tuner(struct rt2x00_dev
*rt2x00dev
)
83 cancel_delayed_work_sync(&rt2x00dev
->link
.work
);
87 * Radio control handlers.
89 int rt2x00lib_enable_radio(struct rt2x00_dev
*rt2x00dev
)
94 * Don't enable the radio twice.
95 * And check if the hardware button has been disabled.
97 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
) ||
98 test_bit(DEVICE_DISABLED_RADIO_HW
, &rt2x00dev
->flags
))
102 * Initialize all data queues.
104 rt2x00queue_init_rx(rt2x00dev
);
105 rt2x00queue_init_tx(rt2x00dev
);
111 rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
, STATE_RADIO_ON
);
115 rt2x00leds_led_radio(rt2x00dev
, true);
116 rt2x00led_led_activity(rt2x00dev
, true);
118 __set_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
);
123 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_ON
);
126 * Start the TX queues.
128 ieee80211_start_queues(rt2x00dev
->hw
);
133 void rt2x00lib_disable_radio(struct rt2x00_dev
*rt2x00dev
)
135 if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
139 * Stop all scheduled work.
141 if (work_pending(&rt2x00dev
->intf_work
))
142 cancel_work_sync(&rt2x00dev
->intf_work
);
143 if (work_pending(&rt2x00dev
->filter_work
))
144 cancel_work_sync(&rt2x00dev
->filter_work
);
147 * Stop the TX queues.
149 ieee80211_stop_queues(rt2x00dev
->hw
);
154 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_OFF
);
159 rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
, STATE_RADIO_OFF
);
160 rt2x00led_led_activity(rt2x00dev
, false);
161 rt2x00leds_led_radio(rt2x00dev
, false);
164 void rt2x00lib_toggle_rx(struct rt2x00_dev
*rt2x00dev
, enum dev_state state
)
167 * When we are disabling the RX, we should also stop the link tuner.
169 if (state
== STATE_RADIO_RX_OFF
)
170 rt2x00lib_stop_link_tuner(rt2x00dev
);
172 rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
, state
);
175 * When we are enabling the RX, we should also start the link tuner.
177 if (state
== STATE_RADIO_RX_ON
&&
178 (rt2x00dev
->intf_ap_count
|| rt2x00dev
->intf_sta_count
))
179 rt2x00lib_start_link_tuner(rt2x00dev
);
182 static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev
*rt2x00dev
)
184 enum antenna rx
= rt2x00dev
->link
.ant
.active
.rx
;
185 enum antenna tx
= rt2x00dev
->link
.ant
.active
.tx
;
187 rt2x00_get_link_ant_rssi_history(&rt2x00dev
->link
, ANTENNA_A
);
189 rt2x00_get_link_ant_rssi_history(&rt2x00dev
->link
, ANTENNA_B
);
192 * We are done sampling. Now we should evaluate the results.
194 rt2x00dev
->link
.ant
.flags
&= ~ANTENNA_MODE_SAMPLE
;
197 * During the last period we have sampled the RSSI
198 * from both antenna's. It now is time to determine
199 * which antenna demonstrated the best performance.
200 * When we are already on the antenna with the best
201 * performance, then there really is nothing for us
204 if (sample_a
== sample_b
)
207 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_RX_DIVERSITY
)
208 rx
= (sample_a
> sample_b
) ? ANTENNA_A
: ANTENNA_B
;
210 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_TX_DIVERSITY
)
211 tx
= (sample_a
> sample_b
) ? ANTENNA_A
: ANTENNA_B
;
213 rt2x00lib_config_antenna(rt2x00dev
, rx
, tx
);
216 static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev
*rt2x00dev
)
218 enum antenna rx
= rt2x00dev
->link
.ant
.active
.rx
;
219 enum antenna tx
= rt2x00dev
->link
.ant
.active
.tx
;
220 int rssi_curr
= rt2x00_get_link_ant_rssi(&rt2x00dev
->link
);
221 int rssi_old
= rt2x00_update_ant_rssi(&rt2x00dev
->link
, rssi_curr
);
224 * Legacy driver indicates that we should swap antenna's
225 * when the difference in RSSI is greater that 5. This
226 * also should be done when the RSSI was actually better
227 * then the previous sample.
228 * When the difference exceeds the threshold we should
229 * sample the rssi from the other antenna to make a valid
230 * comparison between the 2 antennas.
232 if (abs(rssi_curr
- rssi_old
) < 5)
235 rt2x00dev
->link
.ant
.flags
|= ANTENNA_MODE_SAMPLE
;
237 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_RX_DIVERSITY
)
238 rx
= (rx
== ANTENNA_A
) ? ANTENNA_B
: ANTENNA_A
;
240 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_TX_DIVERSITY
)
241 tx
= (tx
== ANTENNA_A
) ? ANTENNA_B
: ANTENNA_A
;
243 rt2x00lib_config_antenna(rt2x00dev
, rx
, tx
);
246 static void rt2x00lib_evaluate_antenna(struct rt2x00_dev
*rt2x00dev
)
249 * Determine if software diversity is enabled for
250 * either the TX or RX antenna (or both).
251 * Always perform this check since within the link
252 * tuner interval the configuration might have changed.
254 rt2x00dev
->link
.ant
.flags
&= ~ANTENNA_RX_DIVERSITY
;
255 rt2x00dev
->link
.ant
.flags
&= ~ANTENNA_TX_DIVERSITY
;
257 if (rt2x00dev
->hw
->conf
.antenna_sel_rx
== 0 &&
258 rt2x00dev
->default_ant
.rx
== ANTENNA_SW_DIVERSITY
)
259 rt2x00dev
->link
.ant
.flags
|= ANTENNA_RX_DIVERSITY
;
260 if (rt2x00dev
->hw
->conf
.antenna_sel_tx
== 0 &&
261 rt2x00dev
->default_ant
.tx
== ANTENNA_SW_DIVERSITY
)
262 rt2x00dev
->link
.ant
.flags
|= ANTENNA_TX_DIVERSITY
;
264 if (!(rt2x00dev
->link
.ant
.flags
& ANTENNA_RX_DIVERSITY
) &&
265 !(rt2x00dev
->link
.ant
.flags
& ANTENNA_TX_DIVERSITY
)) {
266 rt2x00dev
->link
.ant
.flags
= 0;
271 * If we have only sampled the data over the last period
272 * we should now harvest the data. Otherwise just evaluate
273 * the data. The latter should only be performed once
276 if (rt2x00dev
->link
.ant
.flags
& ANTENNA_MODE_SAMPLE
)
277 rt2x00lib_evaluate_antenna_sample(rt2x00dev
);
278 else if (rt2x00dev
->link
.count
& 1)
279 rt2x00lib_evaluate_antenna_eval(rt2x00dev
);
282 static void rt2x00lib_update_link_stats(struct link
*link
, int rssi
)
289 if (link
->qual
.avg_rssi
)
290 avg_rssi
= MOVING_AVERAGE(link
->qual
.avg_rssi
, rssi
, 8);
291 link
->qual
.avg_rssi
= avg_rssi
;
294 * Update antenna RSSI
296 if (link
->ant
.rssi_ant
)
297 rssi
= MOVING_AVERAGE(link
->ant
.rssi_ant
, rssi
, 8);
298 link
->ant
.rssi_ant
= rssi
;
301 static void rt2x00lib_precalculate_link_signal(struct link_qual
*qual
)
303 if (qual
->rx_failed
|| qual
->rx_success
)
304 qual
->rx_percentage
=
305 (qual
->rx_success
* 100) /
306 (qual
->rx_failed
+ qual
->rx_success
);
308 qual
->rx_percentage
= 50;
310 if (qual
->tx_failed
|| qual
->tx_success
)
311 qual
->tx_percentage
=
312 (qual
->tx_success
* 100) /
313 (qual
->tx_failed
+ qual
->tx_success
);
315 qual
->tx_percentage
= 50;
317 qual
->rx_success
= 0;
319 qual
->tx_success
= 0;
323 static int rt2x00lib_calculate_link_signal(struct rt2x00_dev
*rt2x00dev
,
326 int rssi_percentage
= 0;
330 * We need a positive value for the RSSI.
333 rssi
+= rt2x00dev
->rssi_offset
;
336 * Calculate the different percentages,
337 * which will be used for the signal.
339 if (rt2x00dev
->rssi_offset
)
340 rssi_percentage
= (rssi
* 100) / rt2x00dev
->rssi_offset
;
343 * Add the individual percentages and use the WEIGHT
344 * defines to calculate the current link signal.
346 signal
= ((WEIGHT_RSSI
* rssi_percentage
) +
347 (WEIGHT_TX
* rt2x00dev
->link
.qual
.tx_percentage
) +
348 (WEIGHT_RX
* rt2x00dev
->link
.qual
.rx_percentage
)) / 100;
350 return (signal
> 100) ? 100 : signal
;
353 static void rt2x00lib_link_tuner(struct work_struct
*work
)
355 struct rt2x00_dev
*rt2x00dev
=
356 container_of(work
, struct rt2x00_dev
, link
.work
.work
);
359 * When the radio is shutting down we should
360 * immediately cease all link tuning.
362 if (!test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
368 rt2x00dev
->ops
->lib
->link_stats(rt2x00dev
, &rt2x00dev
->link
.qual
);
369 rt2x00dev
->low_level_stats
.dot11FCSErrorCount
+=
370 rt2x00dev
->link
.qual
.rx_failed
;
373 * Only perform the link tuning when Link tuning
374 * has been enabled (This could have been disabled from the EEPROM).
376 if (!test_bit(CONFIG_DISABLE_LINK_TUNING
, &rt2x00dev
->flags
))
377 rt2x00dev
->ops
->lib
->link_tuner(rt2x00dev
);
380 * Precalculate a portion of the link signal which is
381 * in based on the tx/rx success/failure counters.
383 rt2x00lib_precalculate_link_signal(&rt2x00dev
->link
.qual
);
386 * Send a signal to the led to update the led signal strength.
388 rt2x00leds_led_quality(rt2x00dev
, rt2x00dev
->link
.qual
.avg_rssi
);
391 * Evaluate antenna setup, make this the last step since this could
392 * possibly reset some statistics.
394 rt2x00lib_evaluate_antenna(rt2x00dev
);
397 * Increase tuner counter, and reschedule the next link tuner run.
399 rt2x00dev
->link
.count
++;
400 queue_delayed_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->link
.work
,
404 static void rt2x00lib_packetfilter_scheduled(struct work_struct
*work
)
406 struct rt2x00_dev
*rt2x00dev
=
407 container_of(work
, struct rt2x00_dev
, filter_work
);
409 rt2x00dev
->ops
->lib
->config_filter(rt2x00dev
, rt2x00dev
->packet_filter
);
412 static void rt2x00lib_intf_scheduled_iter(void *data
, u8
*mac
,
413 struct ieee80211_vif
*vif
)
415 struct rt2x00_dev
*rt2x00dev
= data
;
416 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
418 struct ieee80211_tx_control control
;
419 struct ieee80211_bss_conf conf
;
423 * Copy all data we need during this action under the protection
424 * of a spinlock. Otherwise race conditions might occur which results
425 * into an invalid configuration.
427 spin_lock(&intf
->lock
);
429 memcpy(&conf
, &intf
->conf
, sizeof(conf
));
430 delayed_flags
= intf
->delayed_flags
;
431 intf
->delayed_flags
= 0;
433 spin_unlock(&intf
->lock
);
435 if (delayed_flags
& DELAYED_UPDATE_BEACON
) {
436 skb
= ieee80211_beacon_get(rt2x00dev
->hw
, vif
, &control
);
437 if (skb
&& rt2x00dev
->ops
->hw
->beacon_update(rt2x00dev
->hw
,
442 if (delayed_flags
& DELAYED_CONFIG_ERP
)
443 rt2x00lib_config_erp(rt2x00dev
, intf
, &intf
->conf
);
445 if (delayed_flags
& DELAYED_LED_ASSOC
)
446 rt2x00leds_led_assoc(rt2x00dev
, !!rt2x00dev
->intf_associated
);
449 static void rt2x00lib_intf_scheduled(struct work_struct
*work
)
451 struct rt2x00_dev
*rt2x00dev
=
452 container_of(work
, struct rt2x00_dev
, intf_work
);
455 * Iterate over each interface and perform the
456 * requested configurations.
458 ieee80211_iterate_active_interfaces(rt2x00dev
->hw
,
459 rt2x00lib_intf_scheduled_iter
,
464 * Interrupt context handlers.
466 static void rt2x00lib_beacondone_iter(void *data
, u8
*mac
,
467 struct ieee80211_vif
*vif
)
469 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
471 if (vif
->type
!= IEEE80211_IF_TYPE_AP
&&
472 vif
->type
!= IEEE80211_IF_TYPE_IBSS
)
475 spin_lock(&intf
->lock
);
476 intf
->delayed_flags
|= DELAYED_UPDATE_BEACON
;
477 spin_unlock(&intf
->lock
);
480 void rt2x00lib_beacondone(struct rt2x00_dev
*rt2x00dev
)
482 if (!test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
485 ieee80211_iterate_active_interfaces(rt2x00dev
->hw
,
486 rt2x00lib_beacondone_iter
,
489 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->intf_work
);
491 EXPORT_SYMBOL_GPL(rt2x00lib_beacondone
);
493 void rt2x00lib_txdone(struct queue_entry
*entry
,
494 struct txdone_entry_desc
*txdesc
)
496 struct rt2x00_dev
*rt2x00dev
= entry
->queue
->rt2x00dev
;
497 struct skb_frame_desc
*skbdesc
;
498 struct ieee80211_tx_status tx_status
;
501 * Update TX statistics.
503 rt2x00dev
->link
.qual
.tx_success
+=
504 test_bit(TXDONE_SUCCESS
, &txdesc
->flags
);
505 rt2x00dev
->link
.qual
.tx_failed
+=
506 txdesc
->retry
+ !!test_bit(TXDONE_FAILURE
, &txdesc
->flags
);
509 * Initialize TX status
512 tx_status
.ack_signal
= 0;
513 tx_status
.excessive_retries
=
514 test_bit(TXDONE_EXCESSIVE_RETRY
, &txdesc
->flags
);
515 tx_status
.retry_count
= txdesc
->retry
;
516 memcpy(&tx_status
.control
, txdesc
->control
, sizeof(*txdesc
->control
));
518 if (!(tx_status
.control
.flags
& IEEE80211_TXCTL_NO_ACK
)) {
519 if (test_bit(TXDONE_SUCCESS
, &txdesc
->flags
))
520 tx_status
.flags
|= IEEE80211_TX_STATUS_ACK
;
521 else if (test_bit(TXDONE_FAILURE
, &txdesc
->flags
))
522 rt2x00dev
->low_level_stats
.dot11ACKFailureCount
++;
525 if (tx_status
.control
.flags
& IEEE80211_TXCTL_USE_RTS_CTS
) {
526 if (test_bit(TXDONE_SUCCESS
, &txdesc
->flags
))
527 rt2x00dev
->low_level_stats
.dot11RTSSuccessCount
++;
528 else if (test_bit(TXDONE_FAILURE
, &txdesc
->flags
))
529 rt2x00dev
->low_level_stats
.dot11RTSFailureCount
++;
533 * Send the tx_status to debugfs. Only send the status report
534 * to mac80211 when the frame originated from there. If this was
535 * a extra frame coming through a mac80211 library call (RTS/CTS)
536 * then we should not send the status report back.
537 * If send to mac80211, mac80211 will clean up the skb structure,
538 * otherwise we have to do it ourself.
540 rt2x00debug_dump_frame(rt2x00dev
, DUMP_FRAME_TXDONE
, entry
->skb
);
542 skbdesc
= get_skb_frame_desc(entry
->skb
);
543 if (!(skbdesc
->flags
& FRAME_DESC_DRIVER_GENERATED
))
544 ieee80211_tx_status_irqsafe(rt2x00dev
->hw
,
545 entry
->skb
, &tx_status
);
547 dev_kfree_skb_irq(entry
->skb
);
550 EXPORT_SYMBOL_GPL(rt2x00lib_txdone
);
552 void rt2x00lib_rxdone(struct queue_entry
*entry
,
553 struct rxdone_entry_desc
*rxdesc
)
555 struct rt2x00_dev
*rt2x00dev
= entry
->queue
->rt2x00dev
;
556 struct ieee80211_rx_status
*rx_status
= &rt2x00dev
->rx_status
;
557 struct ieee80211_supported_band
*sband
;
558 struct ieee80211_hdr
*hdr
;
559 const struct rt2x00_rate
*rate
;
565 * Update RX statistics.
567 sband
= &rt2x00dev
->bands
[rt2x00dev
->curr_band
];
568 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
569 rate
= rt2x00_get_rate(sband
->bitrates
[i
].hw_value
);
571 if (((rxdesc
->dev_flags
& RXDONE_SIGNAL_PLCP
) &&
572 (rate
->plcp
== rxdesc
->signal
)) ||
573 (!(rxdesc
->dev_flags
& RXDONE_SIGNAL_PLCP
) &&
574 (rate
->bitrate
== rxdesc
->signal
))) {
581 WARNING(rt2x00dev
, "Frame received with unrecognized signal,"
582 "signal=0x%.2x, plcp=%d.\n", rxdesc
->signal
,
583 !!(rxdesc
->dev_flags
& RXDONE_SIGNAL_PLCP
));
588 * Only update link status if this is a beacon frame carrying our bssid.
590 hdr
= (struct ieee80211_hdr
*)entry
->skb
->data
;
591 fc
= le16_to_cpu(hdr
->frame_control
);
592 if (is_beacon(fc
) && (rxdesc
->dev_flags
& RXDONE_MY_BSS
))
593 rt2x00lib_update_link_stats(&rt2x00dev
->link
, rxdesc
->rssi
);
595 rt2x00dev
->link
.qual
.rx_success
++;
597 rx_status
->rate_idx
= idx
;
599 rt2x00lib_calculate_link_signal(rt2x00dev
, rxdesc
->rssi
);
600 rx_status
->signal
= rxdesc
->rssi
;
601 rx_status
->flag
= rxdesc
->flags
;
602 rx_status
->antenna
= rt2x00dev
->link
.ant
.active
.rx
;
605 * Send frame to mac80211 & debugfs.
606 * mac80211 will clean up the skb structure.
608 rt2x00debug_dump_frame(rt2x00dev
, DUMP_FRAME_RXDONE
, entry
->skb
);
609 ieee80211_rx_irqsafe(rt2x00dev
->hw
, entry
->skb
, rx_status
);
612 EXPORT_SYMBOL_GPL(rt2x00lib_rxdone
);
615 * TX descriptor initializer
617 void rt2x00lib_write_tx_desc(struct rt2x00_dev
*rt2x00dev
,
619 struct ieee80211_tx_control
*control
)
621 struct txentry_desc txdesc
;
622 struct skb_frame_desc
*skbdesc
= get_skb_frame_desc(skb
);
623 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skbdesc
->data
;
624 const struct rt2x00_rate
*rate
;
632 memset(&txdesc
, 0, sizeof(txdesc
));
634 txdesc
.queue
= skbdesc
->entry
->queue
->qid
;
635 txdesc
.cw_min
= skbdesc
->entry
->queue
->cw_min
;
636 txdesc
.cw_max
= skbdesc
->entry
->queue
->cw_max
;
637 txdesc
.aifs
= skbdesc
->entry
->queue
->aifs
;
640 * Read required fields from ieee80211 header.
642 frame_control
= le16_to_cpu(hdr
->frame_control
);
643 seq_ctrl
= le16_to_cpu(hdr
->seq_ctrl
);
645 tx_rate
= control
->tx_rate
->hw_value
;
648 * Check whether this frame is to be acked
650 if (!(control
->flags
& IEEE80211_TXCTL_NO_ACK
))
651 __set_bit(ENTRY_TXD_ACK
, &txdesc
.flags
);
654 * Check if this is a RTS/CTS frame
656 if (is_rts_frame(frame_control
) || is_cts_frame(frame_control
)) {
657 __set_bit(ENTRY_TXD_BURST
, &txdesc
.flags
);
658 if (is_rts_frame(frame_control
)) {
659 __set_bit(ENTRY_TXD_RTS_FRAME
, &txdesc
.flags
);
660 __set_bit(ENTRY_TXD_ACK
, &txdesc
.flags
);
662 __clear_bit(ENTRY_TXD_ACK
, &txdesc
.flags
);
663 if (control
->rts_cts_rate
)
664 tx_rate
= control
->rts_cts_rate
->hw_value
;
668 * Determine retry information.
670 txdesc
.retry_limit
= control
->retry_limit
;
671 if (control
->flags
& IEEE80211_TXCTL_LONG_RETRY_LIMIT
)
672 __set_bit(ENTRY_TXD_RETRY_MODE
, &txdesc
.flags
);
675 * Check if more fragments are pending
677 if (ieee80211_get_morefrag(hdr
)) {
678 __set_bit(ENTRY_TXD_BURST
, &txdesc
.flags
);
679 __set_bit(ENTRY_TXD_MORE_FRAG
, &txdesc
.flags
);
683 * Beacons and probe responses require the tsf timestamp
684 * to be inserted into the frame.
686 if (txdesc
.queue
== QID_BEACON
|| is_probe_resp(frame_control
))
687 __set_bit(ENTRY_TXD_REQ_TIMESTAMP
, &txdesc
.flags
);
690 * Determine with what IFS priority this frame should be send.
691 * Set ifs to IFS_SIFS when the this is not the first fragment,
692 * or this fragment came after RTS/CTS.
694 if (test_bit(ENTRY_TXD_RTS_FRAME
, &txdesc
.flags
)) {
695 txdesc
.ifs
= IFS_SIFS
;
696 } else if (control
->flags
& IEEE80211_TXCTL_FIRST_FRAGMENT
) {
697 __set_bit(ENTRY_TXD_FIRST_FRAGMENT
, &txdesc
.flags
);
698 txdesc
.ifs
= IFS_BACKOFF
;
700 txdesc
.ifs
= IFS_SIFS
;
705 * Length calculation depends on OFDM/CCK rate.
707 rate
= rt2x00_get_rate(tx_rate
);
708 txdesc
.signal
= rate
->plcp
;
709 txdesc
.service
= 0x04;
711 length
= skbdesc
->data_len
+ FCS_LEN
;
712 if (rate
->flags
& DEV_RATE_OFDM
) {
713 __set_bit(ENTRY_TXD_OFDM_RATE
, &txdesc
.flags
);
715 txdesc
.length_high
= (length
>> 6) & 0x3f;
716 txdesc
.length_low
= length
& 0x3f;
719 * Convert length to microseconds.
721 residual
= get_duration_res(length
, rate
->bitrate
);
722 duration
= get_duration(length
, rate
->bitrate
);
728 * Check if we need to set the Length Extension
730 if (rate
->bitrate
== 110 && residual
<= 30)
731 txdesc
.service
|= 0x80;
734 txdesc
.length_high
= (duration
>> 8) & 0xff;
735 txdesc
.length_low
= duration
& 0xff;
738 * When preamble is enabled we should set the
739 * preamble bit for the signal.
741 if (rt2x00_get_rate_preamble(tx_rate
))
742 txdesc
.signal
|= 0x08;
745 rt2x00dev
->ops
->lib
->write_tx_desc(rt2x00dev
, skb
, &txdesc
);
748 * Update queue entry.
750 skbdesc
->entry
->skb
= skb
;
753 * The frame has been completely initialized and ready
754 * for sending to the device. The caller will push the
755 * frame to the device, but we are going to push the
756 * frame to debugfs here.
758 rt2x00debug_dump_frame(rt2x00dev
, DUMP_FRAME_TX
, skb
);
760 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc
);
763 * Driver initialization handlers.
765 const struct rt2x00_rate rt2x00_supported_rates
[12] = {
767 .flags
= DEV_RATE_CCK
| DEV_RATE_BASIC
,
773 .flags
= DEV_RATE_CCK
| DEV_RATE_SHORT_PREAMBLE
| DEV_RATE_BASIC
,
779 .flags
= DEV_RATE_CCK
| DEV_RATE_SHORT_PREAMBLE
| DEV_RATE_BASIC
,
785 .flags
= DEV_RATE_CCK
| DEV_RATE_SHORT_PREAMBLE
| DEV_RATE_BASIC
,
791 .flags
= DEV_RATE_OFDM
| DEV_RATE_BASIC
,
797 .flags
= DEV_RATE_OFDM
,
803 .flags
= DEV_RATE_OFDM
| DEV_RATE_BASIC
,
809 .flags
= DEV_RATE_OFDM
,
815 .flags
= DEV_RATE_OFDM
| DEV_RATE_BASIC
,
821 .flags
= DEV_RATE_OFDM
,
827 .flags
= DEV_RATE_OFDM
,
833 .flags
= DEV_RATE_OFDM
,
840 static void rt2x00lib_channel(struct ieee80211_channel
*entry
,
841 const int channel
, const int tx_power
,
844 entry
->center_freq
= ieee80211_channel_to_frequency(channel
);
845 entry
->hw_value
= value
;
846 entry
->max_power
= tx_power
;
847 entry
->max_antenna_gain
= 0xff;
850 static void rt2x00lib_rate(struct ieee80211_rate
*entry
,
851 const u16 index
, const struct rt2x00_rate
*rate
)
854 entry
->bitrate
= rate
->bitrate
;
855 entry
->hw_value
= rt2x00_create_rate_hw_value(index
, 0);
856 entry
->hw_value_short
= entry
->hw_value
;
858 if (rate
->flags
& DEV_RATE_SHORT_PREAMBLE
) {
859 entry
->flags
|= IEEE80211_RATE_SHORT_PREAMBLE
;
860 entry
->hw_value_short
|= rt2x00_create_rate_hw_value(index
, 1);
864 static int rt2x00lib_probe_hw_modes(struct rt2x00_dev
*rt2x00dev
,
865 struct hw_mode_spec
*spec
)
867 struct ieee80211_hw
*hw
= rt2x00dev
->hw
;
868 struct ieee80211_channel
*channels
;
869 struct ieee80211_rate
*rates
;
870 unsigned int num_rates
;
872 unsigned char tx_power
;
875 if (spec
->supported_rates
& SUPPORT_RATE_CCK
)
877 if (spec
->supported_rates
& SUPPORT_RATE_OFDM
)
880 channels
= kzalloc(sizeof(*channels
) * spec
->num_channels
, GFP_KERNEL
);
884 rates
= kzalloc(sizeof(*rates
) * num_rates
, GFP_KERNEL
);
886 goto exit_free_channels
;
889 * Initialize Rate list.
891 for (i
= 0; i
< num_rates
; i
++)
892 rt2x00lib_rate(&rates
[i
], i
, rt2x00_get_rate(i
));
895 * Initialize Channel list.
897 for (i
= 0; i
< spec
->num_channels
; i
++) {
898 if (spec
->channels
[i
].channel
<= 14) {
899 if (spec
->tx_power_bg
)
900 tx_power
= spec
->tx_power_bg
[i
];
902 tx_power
= spec
->tx_power_default
;
904 if (spec
->tx_power_a
)
905 tx_power
= spec
->tx_power_a
[i
];
907 tx_power
= spec
->tx_power_default
;
910 rt2x00lib_channel(&channels
[i
],
911 spec
->channels
[i
].channel
, tx_power
, i
);
915 * Intitialize 802.11b, 802.11g
919 if (spec
->supported_bands
& SUPPORT_BAND_2GHZ
) {
920 rt2x00dev
->bands
[IEEE80211_BAND_2GHZ
].n_channels
= 14;
921 rt2x00dev
->bands
[IEEE80211_BAND_2GHZ
].n_bitrates
= num_rates
;
922 rt2x00dev
->bands
[IEEE80211_BAND_2GHZ
].channels
= channels
;
923 rt2x00dev
->bands
[IEEE80211_BAND_2GHZ
].bitrates
= rates
;
924 hw
->wiphy
->bands
[IEEE80211_BAND_2GHZ
] =
925 &rt2x00dev
->bands
[IEEE80211_BAND_2GHZ
];
929 * Intitialize 802.11a
931 * Channels: OFDM, UNII, HiperLAN2.
933 if (spec
->supported_bands
& SUPPORT_BAND_5GHZ
) {
934 rt2x00dev
->bands
[IEEE80211_BAND_5GHZ
].n_channels
=
935 spec
->num_channels
- 14;
936 rt2x00dev
->bands
[IEEE80211_BAND_5GHZ
].n_bitrates
=
938 rt2x00dev
->bands
[IEEE80211_BAND_5GHZ
].channels
= &channels
[14];
939 rt2x00dev
->bands
[IEEE80211_BAND_5GHZ
].bitrates
= &rates
[4];
940 hw
->wiphy
->bands
[IEEE80211_BAND_5GHZ
] =
941 &rt2x00dev
->bands
[IEEE80211_BAND_5GHZ
];
948 ERROR(rt2x00dev
, "Allocation ieee80211 modes failed.\n");
952 static void rt2x00lib_remove_hw(struct rt2x00_dev
*rt2x00dev
)
954 if (test_bit(DEVICE_REGISTERED_HW
, &rt2x00dev
->flags
))
955 ieee80211_unregister_hw(rt2x00dev
->hw
);
957 if (likely(rt2x00dev
->hw
->wiphy
->bands
[IEEE80211_BAND_2GHZ
])) {
958 kfree(rt2x00dev
->hw
->wiphy
->bands
[IEEE80211_BAND_2GHZ
]->channels
);
959 kfree(rt2x00dev
->hw
->wiphy
->bands
[IEEE80211_BAND_2GHZ
]->bitrates
);
960 rt2x00dev
->hw
->wiphy
->bands
[IEEE80211_BAND_2GHZ
] = NULL
;
961 rt2x00dev
->hw
->wiphy
->bands
[IEEE80211_BAND_5GHZ
] = NULL
;
965 static int rt2x00lib_probe_hw(struct rt2x00_dev
*rt2x00dev
)
967 struct hw_mode_spec
*spec
= &rt2x00dev
->spec
;
971 * Initialize HW modes.
973 status
= rt2x00lib_probe_hw_modes(rt2x00dev
, spec
);
978 * Initialize HW fields.
980 rt2x00dev
->hw
->queues
= rt2x00dev
->ops
->tx_queues
;
985 status
= ieee80211_register_hw(rt2x00dev
->hw
);
987 rt2x00lib_remove_hw(rt2x00dev
);
991 __set_bit(DEVICE_REGISTERED_HW
, &rt2x00dev
->flags
);
997 * Initialization/uninitialization handlers.
999 static void rt2x00lib_uninitialize(struct rt2x00_dev
*rt2x00dev
)
1001 if (!__test_and_clear_bit(DEVICE_INITIALIZED
, &rt2x00dev
->flags
))
1005 * Unregister extra components.
1007 rt2x00rfkill_unregister(rt2x00dev
);
1010 * Allow the HW to uninitialize.
1012 rt2x00dev
->ops
->lib
->uninitialize(rt2x00dev
);
1015 * Free allocated queue entries.
1017 rt2x00queue_uninitialize(rt2x00dev
);
1020 static int rt2x00lib_initialize(struct rt2x00_dev
*rt2x00dev
)
1024 if (test_bit(DEVICE_INITIALIZED
, &rt2x00dev
->flags
))
1028 * Allocate all queue entries.
1030 status
= rt2x00queue_initialize(rt2x00dev
);
1035 * Initialize the device.
1037 status
= rt2x00dev
->ops
->lib
->initialize(rt2x00dev
);
1039 rt2x00queue_uninitialize(rt2x00dev
);
1043 __set_bit(DEVICE_INITIALIZED
, &rt2x00dev
->flags
);
1046 * Register the extra components.
1048 rt2x00rfkill_register(rt2x00dev
);
1053 int rt2x00lib_start(struct rt2x00_dev
*rt2x00dev
)
1057 if (test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
1061 * If this is the first interface which is added,
1062 * we should load the firmware now.
1064 retval
= rt2x00lib_load_firmware(rt2x00dev
);
1069 * Initialize the device.
1071 retval
= rt2x00lib_initialize(rt2x00dev
);
1078 retval
= rt2x00lib_enable_radio(rt2x00dev
);
1080 rt2x00lib_uninitialize(rt2x00dev
);
1084 rt2x00dev
->intf_ap_count
= 0;
1085 rt2x00dev
->intf_sta_count
= 0;
1086 rt2x00dev
->intf_associated
= 0;
1088 __set_bit(DEVICE_STARTED
, &rt2x00dev
->flags
);
1093 void rt2x00lib_stop(struct rt2x00_dev
*rt2x00dev
)
1095 if (!test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
1099 * Perhaps we can add something smarter here,
1100 * but for now just disabling the radio should do.
1102 rt2x00lib_disable_radio(rt2x00dev
);
1104 rt2x00dev
->intf_ap_count
= 0;
1105 rt2x00dev
->intf_sta_count
= 0;
1106 rt2x00dev
->intf_associated
= 0;
1108 __clear_bit(DEVICE_STARTED
, &rt2x00dev
->flags
);
1112 * driver allocation handlers.
1114 int rt2x00lib_probe_dev(struct rt2x00_dev
*rt2x00dev
)
1116 int retval
= -ENOMEM
;
1119 * Make room for rt2x00_intf inside the per-interface
1120 * structure ieee80211_vif.
1122 rt2x00dev
->hw
->vif_data_size
= sizeof(struct rt2x00_intf
);
1125 * Let the driver probe the device to detect the capabilities.
1127 retval
= rt2x00dev
->ops
->lib
->probe_hw(rt2x00dev
);
1129 ERROR(rt2x00dev
, "Failed to allocate device.\n");
1134 * Initialize configuration work.
1136 INIT_WORK(&rt2x00dev
->intf_work
, rt2x00lib_intf_scheduled
);
1137 INIT_WORK(&rt2x00dev
->filter_work
, rt2x00lib_packetfilter_scheduled
);
1138 INIT_DELAYED_WORK(&rt2x00dev
->link
.work
, rt2x00lib_link_tuner
);
1141 * Allocate queue array.
1143 retval
= rt2x00queue_allocate(rt2x00dev
);
1148 * Initialize ieee80211 structure.
1150 retval
= rt2x00lib_probe_hw(rt2x00dev
);
1152 ERROR(rt2x00dev
, "Failed to initialize hw.\n");
1157 * Register extra components.
1159 rt2x00leds_register(rt2x00dev
);
1160 rt2x00rfkill_allocate(rt2x00dev
);
1161 rt2x00debug_register(rt2x00dev
);
1163 __set_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1168 rt2x00lib_remove_dev(rt2x00dev
);
1172 EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev
);
1174 void rt2x00lib_remove_dev(struct rt2x00_dev
*rt2x00dev
)
1176 __clear_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1181 rt2x00lib_disable_radio(rt2x00dev
);
1184 * Uninitialize device.
1186 rt2x00lib_uninitialize(rt2x00dev
);
1189 * Free extra components
1191 rt2x00debug_deregister(rt2x00dev
);
1192 rt2x00rfkill_free(rt2x00dev
);
1193 rt2x00leds_unregister(rt2x00dev
);
1196 * Free ieee80211_hw memory.
1198 rt2x00lib_remove_hw(rt2x00dev
);
1201 * Free firmware image.
1203 rt2x00lib_free_firmware(rt2x00dev
);
1206 * Free queue structures.
1208 rt2x00queue_free(rt2x00dev
);
1210 EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev
);
1213 * Device state handlers
1216 int rt2x00lib_suspend(struct rt2x00_dev
*rt2x00dev
, pm_message_t state
)
1220 NOTICE(rt2x00dev
, "Going to sleep.\n");
1221 __clear_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1224 * Only continue if mac80211 has open interfaces.
1226 if (!test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
1228 __set_bit(DEVICE_STARTED_SUSPEND
, &rt2x00dev
->flags
);
1233 rt2x00lib_stop(rt2x00dev
);
1234 rt2x00lib_uninitialize(rt2x00dev
);
1237 * Suspend/disable extra components.
1239 rt2x00leds_suspend(rt2x00dev
);
1240 rt2x00rfkill_suspend(rt2x00dev
);
1241 rt2x00debug_deregister(rt2x00dev
);
1245 * Set device mode to sleep for power management,
1246 * on some hardware this call seems to consistently fail.
1247 * From the specifications it is hard to tell why it fails,
1248 * and if this is a "bad thing".
1249 * Overall it is safe to just ignore the failure and
1250 * continue suspending. The only downside is that the
1251 * device will not be in optimal power save mode, but with
1252 * the radio and the other components already disabled the
1253 * device is as good as disabled.
1255 retval
= rt2x00dev
->ops
->lib
->set_device_state(rt2x00dev
, STATE_SLEEP
);
1257 WARNING(rt2x00dev
, "Device failed to enter sleep state, "
1258 "continue suspending.\n");
1262 EXPORT_SYMBOL_GPL(rt2x00lib_suspend
);
1264 static void rt2x00lib_resume_intf(void *data
, u8
*mac
,
1265 struct ieee80211_vif
*vif
)
1267 struct rt2x00_dev
*rt2x00dev
= data
;
1268 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
1270 spin_lock(&intf
->lock
);
1272 rt2x00lib_config_intf(rt2x00dev
, intf
,
1273 vif
->type
, intf
->mac
, intf
->bssid
);
1277 * Master or Ad-hoc mode require a new beacon update.
1279 if (vif
->type
== IEEE80211_IF_TYPE_AP
||
1280 vif
->type
== IEEE80211_IF_TYPE_IBSS
)
1281 intf
->delayed_flags
|= DELAYED_UPDATE_BEACON
;
1283 spin_unlock(&intf
->lock
);
1286 int rt2x00lib_resume(struct rt2x00_dev
*rt2x00dev
)
1290 NOTICE(rt2x00dev
, "Waking up.\n");
1293 * Restore/enable extra components.
1295 rt2x00debug_register(rt2x00dev
);
1296 rt2x00rfkill_resume(rt2x00dev
);
1297 rt2x00leds_resume(rt2x00dev
);
1300 * Only continue if mac80211 had open interfaces.
1302 if (!__test_and_clear_bit(DEVICE_STARTED_SUSPEND
, &rt2x00dev
->flags
))
1306 * Reinitialize device and all active interfaces.
1308 retval
= rt2x00lib_start(rt2x00dev
);
1313 * Reconfigure device.
1315 rt2x00lib_config(rt2x00dev
, &rt2x00dev
->hw
->conf
, 1);
1316 if (!rt2x00dev
->hw
->conf
.radio_enabled
)
1317 rt2x00lib_disable_radio(rt2x00dev
);
1320 * Iterator over each active interface to
1321 * reconfigure the hardware.
1323 ieee80211_iterate_active_interfaces(rt2x00dev
->hw
,
1324 rt2x00lib_resume_intf
, rt2x00dev
);
1327 * We are ready again to receive requests from mac80211.
1329 __set_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
);
1332 * It is possible that during that mac80211 has attempted
1333 * to send frames while we were suspending or resuming.
1334 * In that case we have disabled the TX queue and should
1335 * now enable it again
1337 ieee80211_start_queues(rt2x00dev
->hw
);
1340 * During interface iteration we might have changed the
1341 * delayed_flags, time to handles the event by calling
1342 * the work handler directly.
1344 rt2x00lib_intf_scheduled(&rt2x00dev
->intf_work
);
1349 rt2x00lib_disable_radio(rt2x00dev
);
1350 rt2x00lib_uninitialize(rt2x00dev
);
1351 rt2x00debug_deregister(rt2x00dev
);
1355 EXPORT_SYMBOL_GPL(rt2x00lib_resume
);
1356 #endif /* CONFIG_PM */
1359 * rt2x00lib module information.
1361 MODULE_AUTHOR(DRV_PROJECT
);
1362 MODULE_VERSION(DRV_VERSION
);
1363 MODULE_DESCRIPTION("rt2x00 library");
1364 MODULE_LICENSE("GPL");