1 /* ZD1211 USB-WLAN driver for Linux
3 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
4 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
5 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
6 * Copyright (C) 2007-2008 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/slab.h>
26 #include <linux/usb.h>
27 #include <linux/jiffies.h>
28 #include <net/ieee80211_radiotap.h>
35 struct zd_reg_alpha2_map
{
40 static struct zd_reg_alpha2_map reg_alpha2_map
[] = {
41 { ZD_REGDOMAIN_FCC
, "US" },
42 { ZD_REGDOMAIN_IC
, "CA" },
43 { ZD_REGDOMAIN_ETSI
, "DE" }, /* Generic ETSI, use most restrictive */
44 { ZD_REGDOMAIN_JAPAN
, "JP" },
45 { ZD_REGDOMAIN_JAPAN_ADD
, "JP" },
46 { ZD_REGDOMAIN_SPAIN
, "ES" },
47 { ZD_REGDOMAIN_FRANCE
, "FR" },
50 /* This table contains the hardware specific values for the modulation rates. */
51 static const struct ieee80211_rate zd_rates
[] = {
53 .hw_value
= ZD_CCK_RATE_1M
, },
55 .hw_value
= ZD_CCK_RATE_2M
,
56 .hw_value_short
= ZD_CCK_RATE_2M
| ZD_CCK_PREA_SHORT
,
57 .flags
= IEEE80211_RATE_SHORT_PREAMBLE
},
59 .hw_value
= ZD_CCK_RATE_5_5M
,
60 .hw_value_short
= ZD_CCK_RATE_5_5M
| ZD_CCK_PREA_SHORT
,
61 .flags
= IEEE80211_RATE_SHORT_PREAMBLE
},
63 .hw_value
= ZD_CCK_RATE_11M
,
64 .hw_value_short
= ZD_CCK_RATE_11M
| ZD_CCK_PREA_SHORT
,
65 .flags
= IEEE80211_RATE_SHORT_PREAMBLE
},
67 .hw_value
= ZD_OFDM_RATE_6M
,
70 .hw_value
= ZD_OFDM_RATE_9M
,
73 .hw_value
= ZD_OFDM_RATE_12M
,
76 .hw_value
= ZD_OFDM_RATE_18M
,
79 .hw_value
= ZD_OFDM_RATE_24M
,
82 .hw_value
= ZD_OFDM_RATE_36M
,
85 .hw_value
= ZD_OFDM_RATE_48M
,
88 .hw_value
= ZD_OFDM_RATE_54M
,
93 * Zydas retry rates table. Each line is listed in the same order as
94 * in zd_rates[] and contains all the rate used when a packet is sent
95 * starting with a given rates. Let's consider an example :
97 * "11 Mbits : 4, 3, 2, 1, 0" means :
98 * - packet is sent using 4 different rates
99 * - 1st rate is index 3 (ie 11 Mbits)
100 * - 2nd rate is index 2 (ie 5.5 Mbits)
101 * - 3rd rate is index 1 (ie 2 Mbits)
102 * - 4th rate is index 0 (ie 1 Mbits)
105 static const struct tx_retry_rate zd_retry_rates
[] = {
106 { /* 1 Mbits */ 1, { 0 }},
107 { /* 2 Mbits */ 2, { 1, 0 }},
108 { /* 5.5 Mbits */ 3, { 2, 1, 0 }},
109 { /* 11 Mbits */ 4, { 3, 2, 1, 0 }},
110 { /* 6 Mbits */ 5, { 4, 3, 2, 1, 0 }},
111 { /* 9 Mbits */ 6, { 5, 4, 3, 2, 1, 0}},
112 { /* 12 Mbits */ 5, { 6, 3, 2, 1, 0 }},
113 { /* 18 Mbits */ 6, { 7, 6, 3, 2, 1, 0 }},
114 { /* 24 Mbits */ 6, { 8, 6, 3, 2, 1, 0 }},
115 { /* 36 Mbits */ 7, { 9, 8, 6, 3, 2, 1, 0 }},
116 { /* 48 Mbits */ 8, {10, 9, 8, 6, 3, 2, 1, 0 }},
117 { /* 54 Mbits */ 9, {11, 10, 9, 8, 6, 3, 2, 1, 0 }}
120 static const struct ieee80211_channel zd_channels
[] = {
121 { .center_freq
= 2412, .hw_value
= 1 },
122 { .center_freq
= 2417, .hw_value
= 2 },
123 { .center_freq
= 2422, .hw_value
= 3 },
124 { .center_freq
= 2427, .hw_value
= 4 },
125 { .center_freq
= 2432, .hw_value
= 5 },
126 { .center_freq
= 2437, .hw_value
= 6 },
127 { .center_freq
= 2442, .hw_value
= 7 },
128 { .center_freq
= 2447, .hw_value
= 8 },
129 { .center_freq
= 2452, .hw_value
= 9 },
130 { .center_freq
= 2457, .hw_value
= 10 },
131 { .center_freq
= 2462, .hw_value
= 11 },
132 { .center_freq
= 2467, .hw_value
= 12 },
133 { .center_freq
= 2472, .hw_value
= 13 },
134 { .center_freq
= 2484, .hw_value
= 14 },
137 static void housekeeping_init(struct zd_mac
*mac
);
138 static void housekeeping_enable(struct zd_mac
*mac
);
139 static void housekeeping_disable(struct zd_mac
*mac
);
141 static int zd_reg2alpha2(u8 regdomain
, char *alpha2
)
144 struct zd_reg_alpha2_map
*reg_map
;
145 for (i
= 0; i
< ARRAY_SIZE(reg_alpha2_map
); i
++) {
146 reg_map
= ®_alpha2_map
[i
];
147 if (regdomain
== reg_map
->reg
) {
148 alpha2
[0] = reg_map
->alpha2
[0];
149 alpha2
[1] = reg_map
->alpha2
[1];
156 int zd_mac_preinit_hw(struct ieee80211_hw
*hw
)
160 struct zd_mac
*mac
= zd_hw_mac(hw
);
162 r
= zd_chip_read_mac_addr_fw(&mac
->chip
, addr
);
166 SET_IEEE80211_PERM_ADDR(hw
, addr
);
171 int zd_mac_init_hw(struct ieee80211_hw
*hw
)
174 struct zd_mac
*mac
= zd_hw_mac(hw
);
175 struct zd_chip
*chip
= &mac
->chip
;
177 u8 default_regdomain
;
179 r
= zd_chip_enable_int(chip
);
182 r
= zd_chip_init_hw(chip
);
186 ZD_ASSERT(!irqs_disabled());
188 r
= zd_read_regdomain(chip
, &default_regdomain
);
191 spin_lock_irq(&mac
->lock
);
192 mac
->regdomain
= mac
->default_regdomain
= default_regdomain
;
193 spin_unlock_irq(&mac
->lock
);
195 /* We must inform the device that we are doing encryption/decryption in
196 * software at the moment. */
197 r
= zd_set_encryption_type(chip
, ENC_SNIFFER
);
201 r
= zd_reg2alpha2(mac
->regdomain
, alpha2
);
205 r
= regulatory_hint(hw
->wiphy
, alpha2
);
207 zd_chip_disable_int(chip
);
212 void zd_mac_clear(struct zd_mac
*mac
)
214 flush_workqueue(zd_workqueue
);
215 zd_chip_clear(&mac
->chip
);
216 ZD_ASSERT(!spin_is_locked(&mac
->lock
));
217 ZD_MEMCLEAR(mac
, sizeof(struct zd_mac
));
220 static int set_rx_filter(struct zd_mac
*mac
)
223 u32 filter
= STA_RX_FILTER
;
225 spin_lock_irqsave(&mac
->lock
, flags
);
227 filter
|= RX_FILTER_CTRL
;
228 spin_unlock_irqrestore(&mac
->lock
, flags
);
230 return zd_iowrite32(&mac
->chip
, CR_RX_FILTER
, filter
);
233 static int set_mc_hash(struct zd_mac
*mac
)
235 struct zd_mc_hash hash
;
237 return zd_chip_set_multicast_hash(&mac
->chip
, &hash
);
240 static int zd_op_start(struct ieee80211_hw
*hw
)
242 struct zd_mac
*mac
= zd_hw_mac(hw
);
243 struct zd_chip
*chip
= &mac
->chip
;
244 struct zd_usb
*usb
= &chip
->usb
;
247 if (!usb
->initialized
) {
248 r
= zd_usb_init_hw(usb
);
253 r
= zd_chip_enable_int(chip
);
257 r
= zd_chip_set_basic_rates(chip
, CR_RATES_80211B
| CR_RATES_80211G
);
260 r
= set_rx_filter(mac
);
263 r
= set_mc_hash(mac
);
266 r
= zd_chip_switch_radio_on(chip
);
269 r
= zd_chip_enable_rxtx(chip
);
272 r
= zd_chip_enable_hwint(chip
);
276 housekeeping_enable(mac
);
279 zd_chip_disable_rxtx(chip
);
281 zd_chip_switch_radio_off(chip
);
283 zd_chip_disable_int(chip
);
288 static void zd_op_stop(struct ieee80211_hw
*hw
)
290 struct zd_mac
*mac
= zd_hw_mac(hw
);
291 struct zd_chip
*chip
= &mac
->chip
;
293 struct sk_buff_head
*ack_wait_queue
= &mac
->ack_wait_queue
;
295 /* The order here deliberately is a little different from the open()
296 * method, since we need to make sure there is no opportunity for RX
297 * frames to be processed by mac80211 after we have stopped it.
300 zd_chip_disable_rxtx(chip
);
301 housekeeping_disable(mac
);
302 flush_workqueue(zd_workqueue
);
304 zd_chip_disable_hwint(chip
);
305 zd_chip_switch_radio_off(chip
);
306 zd_chip_disable_int(chip
);
309 while ((skb
= skb_dequeue(ack_wait_queue
)))
310 dev_kfree_skb_any(skb
);
314 * zd_mac_tx_status - reports tx status of a packet if required
315 * @hw - a &struct ieee80211_hw pointer
317 * @flags: extra flags to set in the TX status info
318 * @ackssi: ACK signal strength
319 * @success - True for successful transmission of the frame
321 * This information calls ieee80211_tx_status_irqsafe() if required by the
322 * control information. It copies the control information into the status
325 * If no status information has been requested, the skb is freed.
327 static void zd_mac_tx_status(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
328 int ackssi
, struct tx_status
*tx_status
)
330 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
332 int success
= 1, retry
= 1;
334 const struct tx_retry_rate
*retries
;
336 ieee80211_tx_info_clear_status(info
);
339 success
= !tx_status
->failure
;
340 retry
= tx_status
->retry
+ success
;
345 info
->flags
|= IEEE80211_TX_STAT_ACK
;
348 info
->flags
&= ~IEEE80211_TX_STAT_ACK
;
351 first_idx
= info
->status
.rates
[0].idx
;
352 ZD_ASSERT(0<=first_idx
&& first_idx
<ARRAY_SIZE(zd_retry_rates
));
353 retries
= &zd_retry_rates
[first_idx
];
354 ZD_ASSERT(1 <= retry
&& retry
<= retries
->count
);
356 info
->status
.rates
[0].idx
= retries
->rate
[0];
357 info
->status
.rates
[0].count
= 1; // (retry > 1 ? 2 : 1);
359 for (i
=1; i
<IEEE80211_TX_MAX_RATES
-1 && i
<retry
; i
++) {
360 info
->status
.rates
[i
].idx
= retries
->rate
[i
];
361 info
->status
.rates
[i
].count
= 1; // ((i==retry-1) && success ? 1:2);
363 for (; i
<IEEE80211_TX_MAX_RATES
&& i
<retry
; i
++) {
364 info
->status
.rates
[i
].idx
= retries
->rate
[retry
- 1];
365 info
->status
.rates
[i
].count
= 1; // (success ? 1:2);
367 if (i
<IEEE80211_TX_MAX_RATES
)
368 info
->status
.rates
[i
].idx
= -1; /* terminate */
370 info
->status
.ack_signal
= ackssi
;
371 ieee80211_tx_status_irqsafe(hw
, skb
);
375 * zd_mac_tx_failed - callback for failed frames
376 * @dev: the mac80211 wireless device
378 * This function is called if a frame couldn't be successfully
379 * transferred. The first frame from the tx queue, will be selected and
380 * reported as error to the upper layers.
382 void zd_mac_tx_failed(struct urb
*urb
)
384 struct ieee80211_hw
* hw
= zd_usb_to_hw(urb
->context
);
385 struct zd_mac
*mac
= zd_hw_mac(hw
);
386 struct sk_buff_head
*q
= &mac
->ack_wait_queue
;
388 struct tx_status
*tx_status
= (struct tx_status
*)urb
->transfer_buffer
;
390 int success
= !tx_status
->failure
;
391 int retry
= tx_status
->retry
+ success
;
395 q
= &mac
->ack_wait_queue
;
396 spin_lock_irqsave(&q
->lock
, flags
);
398 skb_queue_walk(q
, skb
) {
399 struct ieee80211_hdr
*tx_hdr
;
400 struct ieee80211_tx_info
*info
;
401 int first_idx
, final_idx
;
402 const struct tx_retry_rate
*retries
;
407 /* if the hardware reports a failure and we had a 802.11 ACK
408 * pending, then we skip the first skb when searching for a
410 if (tx_status
->failure
&& mac
->ack_pending
&&
411 skb_queue_is_first(q
, skb
)) {
415 tx_hdr
= (struct ieee80211_hdr
*)skb
->data
;
417 /* we skip all frames not matching the reported destination */
418 if (unlikely(memcmp(tx_hdr
->addr1
, tx_status
->mac
, ETH_ALEN
))) {
422 /* we skip all frames not matching the reported final rate */
424 info
= IEEE80211_SKB_CB(skb
);
425 first_idx
= info
->status
.rates
[0].idx
;
426 ZD_ASSERT(0<=first_idx
&& first_idx
<ARRAY_SIZE(zd_retry_rates
));
427 retries
= &zd_retry_rates
[first_idx
];
428 if (retry
<= 0 || retry
> retries
->count
)
431 final_idx
= retries
->rate
[retry
- 1];
432 final_rate
= zd_rates
[final_idx
].hw_value
;
434 if (final_rate
!= tx_status
->rate
) {
443 for (i
=1; i
<=position
; i
++) {
444 skb
= __skb_dequeue(q
);
445 zd_mac_tx_status(hw
, skb
,
446 mac
->ack_pending
? mac
->ack_signal
: 0,
447 i
== position
? tx_status
: NULL
);
448 mac
->ack_pending
= 0;
452 spin_unlock_irqrestore(&q
->lock
, flags
);
456 * zd_mac_tx_to_dev - callback for USB layer
457 * @skb: a &sk_buff pointer
458 * @error: error value, 0 if transmission successful
460 * Informs the MAC layer that the frame has successfully transferred to the
461 * device. If an ACK is required and the transfer to the device has been
462 * successful, the packets are put on the @ack_wait_queue with
463 * the control set removed.
465 void zd_mac_tx_to_dev(struct sk_buff
*skb
, int error
)
467 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
468 struct ieee80211_hw
*hw
= info
->rate_driver_data
[0];
469 struct zd_mac
*mac
= zd_hw_mac(hw
);
471 ieee80211_tx_info_clear_status(info
);
473 skb_pull(skb
, sizeof(struct zd_ctrlset
));
474 if (unlikely(error
||
475 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
))) {
477 * FIXME : do we need to fill in anything ?
479 ieee80211_tx_status_irqsafe(hw
, skb
);
481 struct sk_buff_head
*q
= &mac
->ack_wait_queue
;
483 skb_queue_tail(q
, skb
);
484 while (skb_queue_len(q
) > ZD_MAC_MAX_ACK_WAITERS
) {
485 zd_mac_tx_status(hw
, skb_dequeue(q
),
486 mac
->ack_pending
? mac
->ack_signal
: 0,
488 mac
->ack_pending
= 0;
493 static int zd_calc_tx_length_us(u8
*service
, u8 zd_rate
, u16 tx_length
)
495 /* ZD_PURE_RATE() must be used to remove the modulation type flag of
496 * the zd-rate values.
498 static const u8 rate_divisor
[] = {
499 [ZD_PURE_RATE(ZD_CCK_RATE_1M
)] = 1,
500 [ZD_PURE_RATE(ZD_CCK_RATE_2M
)] = 2,
501 /* Bits must be doubled. */
502 [ZD_PURE_RATE(ZD_CCK_RATE_5_5M
)] = 11,
503 [ZD_PURE_RATE(ZD_CCK_RATE_11M
)] = 11,
504 [ZD_PURE_RATE(ZD_OFDM_RATE_6M
)] = 6,
505 [ZD_PURE_RATE(ZD_OFDM_RATE_9M
)] = 9,
506 [ZD_PURE_RATE(ZD_OFDM_RATE_12M
)] = 12,
507 [ZD_PURE_RATE(ZD_OFDM_RATE_18M
)] = 18,
508 [ZD_PURE_RATE(ZD_OFDM_RATE_24M
)] = 24,
509 [ZD_PURE_RATE(ZD_OFDM_RATE_36M
)] = 36,
510 [ZD_PURE_RATE(ZD_OFDM_RATE_48M
)] = 48,
511 [ZD_PURE_RATE(ZD_OFDM_RATE_54M
)] = 54,
514 u32 bits
= (u32
)tx_length
* 8;
517 divisor
= rate_divisor
[ZD_PURE_RATE(zd_rate
)];
522 case ZD_CCK_RATE_5_5M
:
523 bits
= (2*bits
) + 10; /* round up to the next integer */
525 case ZD_CCK_RATE_11M
:
528 *service
&= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION
;
529 if (0 < t
&& t
<= 3) {
530 *service
|= ZD_PLCP_SERVICE_LENGTH_EXTENSION
;
533 bits
+= 10; /* round up to the next integer */
540 static void cs_set_control(struct zd_mac
*mac
, struct zd_ctrlset
*cs
,
541 struct ieee80211_hdr
*header
,
542 struct ieee80211_tx_info
*info
)
546 * - if backoff needed, enable bit 0
547 * - if burst (backoff not needed) disable bit 0
553 if (info
->flags
& IEEE80211_TX_CTL_FIRST_FRAGMENT
)
554 cs
->control
|= ZD_CS_NEED_RANDOM_BACKOFF
;
556 /* No ACK expected (multicast, etc.) */
557 if (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
558 cs
->control
|= ZD_CS_NO_ACK
;
561 if (ieee80211_is_pspoll(header
->frame_control
))
562 cs
->control
|= ZD_CS_PS_POLL_FRAME
;
564 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_RTS_CTS
)
565 cs
->control
|= ZD_CS_RTS
;
567 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_CTS_PROTECT
)
568 cs
->control
|= ZD_CS_SELF_CTS
;
570 /* FIXME: Management frame? */
573 static int zd_mac_config_beacon(struct ieee80211_hw
*hw
, struct sk_buff
*beacon
)
575 struct zd_mac
*mac
= zd_hw_mac(hw
);
578 /* 4 more bytes for tail CRC */
579 u32 full_len
= beacon
->len
+ 4;
581 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, 0);
584 r
= zd_ioread32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, &tmp
);
589 r
= zd_ioread32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, &tmp
);
592 if ((++j
% 100) == 0) {
593 printk(KERN_ERR
"CR_BCN_FIFO_SEMAPHORE not ready\n");
595 printk(KERN_ERR
"Giving up beacon config.\n");
602 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO
, full_len
- 1);
605 if (zd_chip_is_zd1211b(&mac
->chip
)) {
606 r
= zd_iowrite32(&mac
->chip
, CR_BCN_LENGTH
, full_len
- 1);
611 for (j
= 0 ; j
< beacon
->len
; j
++) {
612 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO
,
613 *((u8
*)(beacon
->data
+ j
)));
618 for (j
= 0; j
< 4; j
++) {
619 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO
, 0x0);
624 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, 1);
628 /* 802.11b/g 2.4G CCK 1Mb
629 * 802.11a, not yet implemented, uses different values (see GPL vendor
632 return zd_iowrite32(&mac
->chip
, CR_BCN_PLCP_CFG
, 0x00000400 |
636 static int fill_ctrlset(struct zd_mac
*mac
,
640 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
641 unsigned int frag_len
= skb
->len
+ FCS_LEN
;
642 unsigned int packet_length
;
643 struct ieee80211_rate
*txrate
;
644 struct zd_ctrlset
*cs
= (struct zd_ctrlset
*)
645 skb_push(skb
, sizeof(struct zd_ctrlset
));
646 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
648 ZD_ASSERT(frag_len
<= 0xffff);
650 txrate
= ieee80211_get_tx_rate(mac
->hw
, info
);
652 cs
->modulation
= txrate
->hw_value
;
653 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_SHORT_PREAMBLE
)
654 cs
->modulation
= txrate
->hw_value_short
;
656 cs
->tx_length
= cpu_to_le16(frag_len
);
658 cs_set_control(mac
, cs
, hdr
, info
);
660 packet_length
= frag_len
+ sizeof(struct zd_ctrlset
) + 10;
661 ZD_ASSERT(packet_length
<= 0xffff);
662 /* ZD1211B: Computing the length difference this way, gives us
663 * flexibility to compute the packet length.
665 cs
->packet_length
= cpu_to_le16(zd_chip_is_zd1211b(&mac
->chip
) ?
666 packet_length
- frag_len
: packet_length
);
670 * - transmit frame length in microseconds
671 * - seems to be derived from frame length
672 * - see Cal_Us_Service() in zdinlinef.h
673 * - if macp->bTxBurstEnable is enabled, then multiply by 4
674 * - bTxBurstEnable is never set in the vendor driver
677 * - "for PLCP configuration"
678 * - always 0 except in some situations at 802.11b 11M
679 * - see line 53 of zdinlinef.h
682 r
= zd_calc_tx_length_us(&cs
->service
, ZD_RATE(cs
->modulation
),
683 le16_to_cpu(cs
->tx_length
));
686 cs
->current_length
= cpu_to_le16(r
);
687 cs
->next_frame_length
= 0;
693 * zd_op_tx - transmits a network frame to the device
695 * @dev: mac80211 hardware device
696 * @skb: socket buffer
697 * @control: the control structure
699 * This function transmit an IEEE 802.11 network frame to the device. The
700 * control block of the skbuff will be initialized. If necessary the incoming
701 * mac80211 queues will be stopped.
703 static int zd_op_tx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
705 struct zd_mac
*mac
= zd_hw_mac(hw
);
706 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
709 r
= fill_ctrlset(mac
, skb
);
713 info
->rate_driver_data
[0] = hw
;
715 r
= zd_usb_tx(&mac
->chip
.usb
, skb
);
726 * filter_ack - filters incoming packets for acknowledgements
727 * @dev: the mac80211 device
728 * @rx_hdr: received header
729 * @stats: the status for the received packet
731 * This functions looks for ACK packets and tries to match them with the
732 * frames in the tx queue. If a match is found the frame will be dequeued and
733 * the upper layers is informed about the successful transmission. If
734 * mac80211 queues have been stopped and the number of frames still to be
735 * transmitted is low the queues will be opened again.
737 * Returns 1 if the frame was an ACK, 0 if it was ignored.
739 static int filter_ack(struct ieee80211_hw
*hw
, struct ieee80211_hdr
*rx_hdr
,
740 struct ieee80211_rx_status
*stats
)
742 struct zd_mac
*mac
= zd_hw_mac(hw
);
744 struct sk_buff_head
*q
;
749 if (!ieee80211_is_ack(rx_hdr
->frame_control
))
752 q
= &mac
->ack_wait_queue
;
753 spin_lock_irqsave(&q
->lock
, flags
);
754 skb_queue_walk(q
, skb
) {
755 struct ieee80211_hdr
*tx_hdr
;
759 if (mac
->ack_pending
&& skb_queue_is_first(q
, skb
))
762 tx_hdr
= (struct ieee80211_hdr
*)skb
->data
;
763 if (likely(!memcmp(tx_hdr
->addr2
, rx_hdr
->addr1
, ETH_ALEN
)))
771 for (i
=1; i
<position
; i
++) {
772 skb
= __skb_dequeue(q
);
773 zd_mac_tx_status(hw
, skb
,
774 mac
->ack_pending
? mac
->ack_signal
: 0,
776 mac
->ack_pending
= 0;
779 mac
->ack_pending
= 1;
780 mac
->ack_signal
= stats
->signal
;
783 spin_unlock_irqrestore(&q
->lock
, flags
);
787 int zd_mac_rx(struct ieee80211_hw
*hw
, const u8
*buffer
, unsigned int length
)
789 struct zd_mac
*mac
= zd_hw_mac(hw
);
790 struct ieee80211_rx_status stats
;
791 const struct rx_status
*status
;
799 if (length
< ZD_PLCP_HEADER_SIZE
+ 10 /* IEEE80211_1ADDR_LEN */ +
800 FCS_LEN
+ sizeof(struct rx_status
))
803 memset(&stats
, 0, sizeof(stats
));
805 /* Note about pass_failed_fcs and pass_ctrl access below:
806 * mac locking intentionally omitted here, as this is the only unlocked
807 * reader and the only writer is configure_filter. Plus, if there were
808 * any races accessing these variables, it wouldn't really matter.
809 * If mac80211 ever provides a way for us to access filter flags
810 * from outside configure_filter, we could improve on this. Also, this
811 * situation may change once we implement some kind of DMA-into-skb
814 /* Caller has to ensure that length >= sizeof(struct rx_status). */
815 status
= (struct rx_status
*)
816 (buffer
+ (length
- sizeof(struct rx_status
)));
817 if (status
->frame_status
& ZD_RX_ERROR
) {
818 if (mac
->pass_failed_fcs
&&
819 (status
->frame_status
& ZD_RX_CRC32_ERROR
)) {
820 stats
.flag
|= RX_FLAG_FAILED_FCS_CRC
;
827 stats
.freq
= zd_channels
[_zd_chip_get_channel(&mac
->chip
) - 1].center_freq
;
828 stats
.band
= IEEE80211_BAND_2GHZ
;
829 stats
.signal
= status
->signal_strength
;
831 rate
= zd_rx_rate(buffer
, status
);
833 /* todo: return index in the big switches in zd_rx_rate instead */
834 for (i
= 0; i
< mac
->band
.n_bitrates
; i
++)
835 if (rate
== mac
->band
.bitrates
[i
].hw_value
)
838 length
-= ZD_PLCP_HEADER_SIZE
+ sizeof(struct rx_status
);
839 buffer
+= ZD_PLCP_HEADER_SIZE
;
841 /* Except for bad frames, filter each frame to see if it is an ACK, in
842 * which case our internal TX tracking is updated. Normally we then
843 * bail here as there's no need to pass ACKs on up to the stack, but
844 * there is also the case where the stack has requested us to pass
845 * control frames on up (pass_ctrl) which we must consider. */
847 filter_ack(hw
, (struct ieee80211_hdr
*)buffer
, &stats
)
851 fc
= get_unaligned((__le16
*)buffer
);
852 need_padding
= ieee80211_is_data_qos(fc
) ^ ieee80211_has_a4(fc
);
854 skb
= dev_alloc_skb(length
+ (need_padding
? 2 : 0));
858 /* Make sure the the payload data is 4 byte aligned. */
862 /* FIXME : could we avoid this big memcpy ? */
863 memcpy(skb_put(skb
, length
), buffer
, length
);
865 memcpy(IEEE80211_SKB_RXCB(skb
), &stats
, sizeof(stats
));
866 ieee80211_rx_irqsafe(hw
, skb
);
870 static int zd_op_add_interface(struct ieee80211_hw
*hw
,
871 struct ieee80211_vif
*vif
)
873 struct zd_mac
*mac
= zd_hw_mac(hw
);
875 /* using NL80211_IFTYPE_UNSPECIFIED to indicate no mode selected */
876 if (mac
->type
!= NL80211_IFTYPE_UNSPECIFIED
)
880 case NL80211_IFTYPE_MONITOR
:
881 case NL80211_IFTYPE_MESH_POINT
:
882 case NL80211_IFTYPE_STATION
:
883 case NL80211_IFTYPE_ADHOC
:
884 mac
->type
= vif
->type
;
890 return zd_write_mac_addr(&mac
->chip
, vif
->addr
);
893 static void zd_op_remove_interface(struct ieee80211_hw
*hw
,
894 struct ieee80211_vif
*vif
)
896 struct zd_mac
*mac
= zd_hw_mac(hw
);
897 mac
->type
= NL80211_IFTYPE_UNSPECIFIED
;
898 zd_set_beacon_interval(&mac
->chip
, 0);
899 zd_write_mac_addr(&mac
->chip
, NULL
);
902 static int zd_op_config(struct ieee80211_hw
*hw
, u32 changed
)
904 struct zd_mac
*mac
= zd_hw_mac(hw
);
905 struct ieee80211_conf
*conf
= &hw
->conf
;
907 return zd_chip_set_channel(&mac
->chip
, conf
->channel
->hw_value
);
910 static void zd_process_intr(struct work_struct
*work
)
913 struct zd_mac
*mac
= container_of(work
, struct zd_mac
, process_intr
);
915 int_status
= le16_to_cpu(*(__le16
*)(mac
->intr_buffer
+4));
916 if (int_status
& INT_CFG_NEXT_BCN
)
917 dev_dbg_f_limit(zd_mac_dev(mac
), "INT_CFG_NEXT_BCN\n");
919 dev_dbg_f(zd_mac_dev(mac
), "Unsupported interrupt\n");
921 zd_chip_enable_hwint(&mac
->chip
);
925 static void set_multicast_hash_handler(struct work_struct
*work
)
928 container_of(work
, struct zd_mac
, set_multicast_hash_work
);
929 struct zd_mc_hash hash
;
931 spin_lock_irq(&mac
->lock
);
932 hash
= mac
->multicast_hash
;
933 spin_unlock_irq(&mac
->lock
);
935 zd_chip_set_multicast_hash(&mac
->chip
, &hash
);
938 static void set_rx_filter_handler(struct work_struct
*work
)
941 container_of(work
, struct zd_mac
, set_rx_filter_work
);
944 dev_dbg_f(zd_mac_dev(mac
), "\n");
945 r
= set_rx_filter(mac
);
947 dev_err(zd_mac_dev(mac
), "set_rx_filter_handler error %d\n", r
);
950 static u64
zd_op_prepare_multicast(struct ieee80211_hw
*hw
,
951 int mc_count
, struct dev_addr_list
*mclist
)
953 struct zd_mac
*mac
= zd_hw_mac(hw
);
954 struct zd_mc_hash hash
;
959 for (i
= 0; i
< mc_count
; i
++) {
962 dev_dbg_f(zd_mac_dev(mac
), "mc addr %pM\n", mclist
->dmi_addr
);
963 zd_mc_add_addr(&hash
, mclist
->dmi_addr
);
964 mclist
= mclist
->next
;
967 return hash
.low
| ((u64
)hash
.high
<< 32);
970 #define SUPPORTED_FIF_FLAGS \
971 (FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
972 FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
973 static void zd_op_configure_filter(struct ieee80211_hw
*hw
,
974 unsigned int changed_flags
,
975 unsigned int *new_flags
,
978 struct zd_mc_hash hash
= {
980 .high
= multicast
>> 32,
982 struct zd_mac
*mac
= zd_hw_mac(hw
);
985 /* Only deal with supported flags */
986 changed_flags
&= SUPPORTED_FIF_FLAGS
;
987 *new_flags
&= SUPPORTED_FIF_FLAGS
;
990 * If multicast parameter (as returned by zd_op_prepare_multicast)
991 * has changed, no bit in changed_flags is set. To handle this
992 * situation, we do not return if changed_flags is 0. If we do so,
993 * we will have some issue with IPv6 which uses multicast for link
994 * layer address resolution.
996 if (*new_flags
& (FIF_PROMISC_IN_BSS
| FIF_ALLMULTI
))
997 zd_mc_add_all(&hash
);
999 spin_lock_irqsave(&mac
->lock
, flags
);
1000 mac
->pass_failed_fcs
= !!(*new_flags
& FIF_FCSFAIL
);
1001 mac
->pass_ctrl
= !!(*new_flags
& FIF_CONTROL
);
1002 mac
->multicast_hash
= hash
;
1003 spin_unlock_irqrestore(&mac
->lock
, flags
);
1005 /* XXX: these can be called here now, can sleep now! */
1006 queue_work(zd_workqueue
, &mac
->set_multicast_hash_work
);
1008 if (changed_flags
& FIF_CONTROL
)
1009 queue_work(zd_workqueue
, &mac
->set_rx_filter_work
);
1011 /* no handling required for FIF_OTHER_BSS as we don't currently
1012 * do BSSID filtering */
1013 /* FIXME: in future it would be nice to enable the probe response
1014 * filter (so that the driver doesn't see them) until
1015 * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
1016 * have to schedule work to enable prbresp reception, which might
1017 * happen too late. For now we'll just listen and forward them all the
1021 static void set_rts_cts_work(struct work_struct
*work
)
1023 struct zd_mac
*mac
=
1024 container_of(work
, struct zd_mac
, set_rts_cts_work
);
1025 unsigned long flags
;
1026 unsigned int short_preamble
;
1028 mutex_lock(&mac
->chip
.mutex
);
1030 spin_lock_irqsave(&mac
->lock
, flags
);
1031 mac
->updating_rts_rate
= 0;
1032 short_preamble
= mac
->short_preamble
;
1033 spin_unlock_irqrestore(&mac
->lock
, flags
);
1035 zd_chip_set_rts_cts_rate_locked(&mac
->chip
, short_preamble
);
1036 mutex_unlock(&mac
->chip
.mutex
);
1039 static void zd_op_bss_info_changed(struct ieee80211_hw
*hw
,
1040 struct ieee80211_vif
*vif
,
1041 struct ieee80211_bss_conf
*bss_conf
,
1044 struct zd_mac
*mac
= zd_hw_mac(hw
);
1045 unsigned long flags
;
1048 dev_dbg_f(zd_mac_dev(mac
), "changes: %x\n", changes
);
1050 if (mac
->type
== NL80211_IFTYPE_MESH_POINT
||
1051 mac
->type
== NL80211_IFTYPE_ADHOC
) {
1053 if (changes
& BSS_CHANGED_BEACON
) {
1054 struct sk_buff
*beacon
= ieee80211_beacon_get(hw
, vif
);
1057 zd_mac_config_beacon(hw
, beacon
);
1062 if (changes
& BSS_CHANGED_BEACON_ENABLED
) {
1065 if (bss_conf
->enable_beacon
)
1066 interval
= BCN_MODE_IBSS
|
1067 bss_conf
->beacon_int
;
1071 zd_set_beacon_interval(&mac
->chip
, interval
);
1074 associated
= is_valid_ether_addr(bss_conf
->bssid
);
1076 spin_lock_irq(&mac
->lock
);
1077 mac
->associated
= associated
;
1078 spin_unlock_irq(&mac
->lock
);
1080 /* TODO: do hardware bssid filtering */
1082 if (changes
& BSS_CHANGED_ERP_PREAMBLE
) {
1083 spin_lock_irqsave(&mac
->lock
, flags
);
1084 mac
->short_preamble
= bss_conf
->use_short_preamble
;
1085 if (!mac
->updating_rts_rate
) {
1086 mac
->updating_rts_rate
= 1;
1087 /* FIXME: should disable TX here, until work has
1088 * completed and RTS_CTS reg is updated */
1089 queue_work(zd_workqueue
, &mac
->set_rts_cts_work
);
1091 spin_unlock_irqrestore(&mac
->lock
, flags
);
1095 static u64
zd_op_get_tsf(struct ieee80211_hw
*hw
)
1097 struct zd_mac
*mac
= zd_hw_mac(hw
);
1098 return zd_chip_get_tsf(&mac
->chip
);
1101 static const struct ieee80211_ops zd_ops
= {
1103 .start
= zd_op_start
,
1105 .add_interface
= zd_op_add_interface
,
1106 .remove_interface
= zd_op_remove_interface
,
1107 .config
= zd_op_config
,
1108 .prepare_multicast
= zd_op_prepare_multicast
,
1109 .configure_filter
= zd_op_configure_filter
,
1110 .bss_info_changed
= zd_op_bss_info_changed
,
1111 .get_tsf
= zd_op_get_tsf
,
1114 struct ieee80211_hw
*zd_mac_alloc_hw(struct usb_interface
*intf
)
1117 struct ieee80211_hw
*hw
;
1119 hw
= ieee80211_alloc_hw(sizeof(struct zd_mac
), &zd_ops
);
1121 dev_dbg_f(&intf
->dev
, "out of memory\n");
1125 mac
= zd_hw_mac(hw
);
1127 memset(mac
, 0, sizeof(*mac
));
1128 spin_lock_init(&mac
->lock
);
1131 mac
->type
= NL80211_IFTYPE_UNSPECIFIED
;
1133 memcpy(mac
->channels
, zd_channels
, sizeof(zd_channels
));
1134 memcpy(mac
->rates
, zd_rates
, sizeof(zd_rates
));
1135 mac
->band
.n_bitrates
= ARRAY_SIZE(zd_rates
);
1136 mac
->band
.bitrates
= mac
->rates
;
1137 mac
->band
.n_channels
= ARRAY_SIZE(zd_channels
);
1138 mac
->band
.channels
= mac
->channels
;
1140 hw
->wiphy
->bands
[IEEE80211_BAND_2GHZ
] = &mac
->band
;
1142 hw
->flags
= IEEE80211_HW_RX_INCLUDES_FCS
|
1143 IEEE80211_HW_SIGNAL_UNSPEC
;
1145 hw
->wiphy
->interface_modes
=
1146 BIT(NL80211_IFTYPE_MESH_POINT
) |
1147 BIT(NL80211_IFTYPE_STATION
) |
1148 BIT(NL80211_IFTYPE_ADHOC
);
1150 hw
->max_signal
= 100;
1152 hw
->extra_tx_headroom
= sizeof(struct zd_ctrlset
);
1155 * Tell mac80211 that we support multi rate retries
1157 hw
->max_rates
= IEEE80211_TX_MAX_RATES
;
1158 hw
->max_rate_tries
= 18; /* 9 rates * 2 retries/rate */
1160 skb_queue_head_init(&mac
->ack_wait_queue
);
1161 mac
->ack_pending
= 0;
1163 zd_chip_init(&mac
->chip
, hw
, intf
);
1164 housekeeping_init(mac
);
1165 INIT_WORK(&mac
->set_multicast_hash_work
, set_multicast_hash_handler
);
1166 INIT_WORK(&mac
->set_rts_cts_work
, set_rts_cts_work
);
1167 INIT_WORK(&mac
->set_rx_filter_work
, set_rx_filter_handler
);
1168 INIT_WORK(&mac
->process_intr
, zd_process_intr
);
1170 SET_IEEE80211_DEV(hw
, &intf
->dev
);
1174 #define LINK_LED_WORK_DELAY HZ
1176 static void link_led_handler(struct work_struct
*work
)
1178 struct zd_mac
*mac
=
1179 container_of(work
, struct zd_mac
, housekeeping
.link_led_work
.work
);
1180 struct zd_chip
*chip
= &mac
->chip
;
1184 spin_lock_irq(&mac
->lock
);
1185 is_associated
= mac
->associated
;
1186 spin_unlock_irq(&mac
->lock
);
1188 r
= zd_chip_control_leds(chip
,
1189 is_associated
? ZD_LED_ASSOCIATED
: ZD_LED_SCANNING
);
1191 dev_dbg_f(zd_mac_dev(mac
), "zd_chip_control_leds error %d\n", r
);
1193 queue_delayed_work(zd_workqueue
, &mac
->housekeeping
.link_led_work
,
1194 LINK_LED_WORK_DELAY
);
1197 static void housekeeping_init(struct zd_mac
*mac
)
1199 INIT_DELAYED_WORK(&mac
->housekeeping
.link_led_work
, link_led_handler
);
1202 static void housekeeping_enable(struct zd_mac
*mac
)
1204 dev_dbg_f(zd_mac_dev(mac
), "\n");
1205 queue_delayed_work(zd_workqueue
, &mac
->housekeeping
.link_led_work
,
1209 static void housekeeping_disable(struct zd_mac
*mac
)
1211 dev_dbg_f(zd_mac_dev(mac
), "\n");
1212 cancel_rearming_delayed_workqueue(zd_workqueue
,
1213 &mac
->housekeeping
.link_led_work
);
1214 zd_chip_control_leds(&mac
->chip
, ZD_LED_OFF
);