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/usb.h>
26 #include <linux/jiffies.h>
27 #include <net/ieee80211_radiotap.h>
34 struct zd_reg_alpha2_map
{
39 static struct zd_reg_alpha2_map reg_alpha2_map
[] = {
40 { ZD_REGDOMAIN_FCC
, "US" },
41 { ZD_REGDOMAIN_IC
, "CA" },
42 { ZD_REGDOMAIN_ETSI
, "DE" }, /* Generic ETSI, use most restrictive */
43 { ZD_REGDOMAIN_JAPAN
, "JP" },
44 { ZD_REGDOMAIN_JAPAN_ADD
, "JP" },
45 { ZD_REGDOMAIN_SPAIN
, "ES" },
46 { ZD_REGDOMAIN_FRANCE
, "FR" },
49 /* This table contains the hardware specific values for the modulation rates. */
50 static const struct ieee80211_rate zd_rates
[] = {
52 .hw_value
= ZD_CCK_RATE_1M
, },
54 .hw_value
= ZD_CCK_RATE_2M
,
55 .hw_value_short
= ZD_CCK_RATE_2M
| ZD_CCK_PREA_SHORT
,
56 .flags
= IEEE80211_RATE_SHORT_PREAMBLE
},
58 .hw_value
= ZD_CCK_RATE_5_5M
,
59 .hw_value_short
= ZD_CCK_RATE_5_5M
| ZD_CCK_PREA_SHORT
,
60 .flags
= IEEE80211_RATE_SHORT_PREAMBLE
},
62 .hw_value
= ZD_CCK_RATE_11M
,
63 .hw_value_short
= ZD_CCK_RATE_11M
| ZD_CCK_PREA_SHORT
,
64 .flags
= IEEE80211_RATE_SHORT_PREAMBLE
},
66 .hw_value
= ZD_OFDM_RATE_6M
,
69 .hw_value
= ZD_OFDM_RATE_9M
,
72 .hw_value
= ZD_OFDM_RATE_12M
,
75 .hw_value
= ZD_OFDM_RATE_18M
,
78 .hw_value
= ZD_OFDM_RATE_24M
,
81 .hw_value
= ZD_OFDM_RATE_36M
,
84 .hw_value
= ZD_OFDM_RATE_48M
,
87 .hw_value
= ZD_OFDM_RATE_54M
,
92 * Zydas retry rates table. Each line is listed in the same order as
93 * in zd_rates[] and contains all the rate used when a packet is sent
94 * starting with a given rates. Let's consider an example :
96 * "11 Mbits : 4, 3, 2, 1, 0" means :
97 * - packet is sent using 4 different rates
98 * - 1st rate is index 3 (ie 11 Mbits)
99 * - 2nd rate is index 2 (ie 5.5 Mbits)
100 * - 3rd rate is index 1 (ie 2 Mbits)
101 * - 4th rate is index 0 (ie 1 Mbits)
104 static const struct tx_retry_rate zd_retry_rates
[] = {
105 { /* 1 Mbits */ 1, { 0 }},
106 { /* 2 Mbits */ 2, { 1, 0 }},
107 { /* 5.5 Mbits */ 3, { 2, 1, 0 }},
108 { /* 11 Mbits */ 4, { 3, 2, 1, 0 }},
109 { /* 6 Mbits */ 5, { 4, 3, 2, 1, 0 }},
110 { /* 9 Mbits */ 6, { 5, 4, 3, 2, 1, 0}},
111 { /* 12 Mbits */ 5, { 6, 3, 2, 1, 0 }},
112 { /* 18 Mbits */ 6, { 7, 6, 3, 2, 1, 0 }},
113 { /* 24 Mbits */ 6, { 8, 6, 3, 2, 1, 0 }},
114 { /* 36 Mbits */ 7, { 9, 8, 6, 3, 2, 1, 0 }},
115 { /* 48 Mbits */ 8, {10, 9, 8, 6, 3, 2, 1, 0 }},
116 { /* 54 Mbits */ 9, {11, 10, 9, 8, 6, 3, 2, 1, 0 }}
119 static const struct ieee80211_channel zd_channels
[] = {
120 { .center_freq
= 2412, .hw_value
= 1 },
121 { .center_freq
= 2417, .hw_value
= 2 },
122 { .center_freq
= 2422, .hw_value
= 3 },
123 { .center_freq
= 2427, .hw_value
= 4 },
124 { .center_freq
= 2432, .hw_value
= 5 },
125 { .center_freq
= 2437, .hw_value
= 6 },
126 { .center_freq
= 2442, .hw_value
= 7 },
127 { .center_freq
= 2447, .hw_value
= 8 },
128 { .center_freq
= 2452, .hw_value
= 9 },
129 { .center_freq
= 2457, .hw_value
= 10 },
130 { .center_freq
= 2462, .hw_value
= 11 },
131 { .center_freq
= 2467, .hw_value
= 12 },
132 { .center_freq
= 2472, .hw_value
= 13 },
133 { .center_freq
= 2484, .hw_value
= 14 },
136 static void housekeeping_init(struct zd_mac
*mac
);
137 static void housekeeping_enable(struct zd_mac
*mac
);
138 static void housekeeping_disable(struct zd_mac
*mac
);
140 static int zd_reg2alpha2(u8 regdomain
, char *alpha2
)
143 struct zd_reg_alpha2_map
*reg_map
;
144 for (i
= 0; i
< ARRAY_SIZE(reg_alpha2_map
); i
++) {
145 reg_map
= ®_alpha2_map
[i
];
146 if (regdomain
== reg_map
->reg
) {
147 alpha2
[0] = reg_map
->alpha2
[0];
148 alpha2
[1] = reg_map
->alpha2
[1];
155 int zd_mac_preinit_hw(struct ieee80211_hw
*hw
)
159 struct zd_mac
*mac
= zd_hw_mac(hw
);
161 r
= zd_chip_read_mac_addr_fw(&mac
->chip
, addr
);
165 SET_IEEE80211_PERM_ADDR(hw
, addr
);
170 int zd_mac_init_hw(struct ieee80211_hw
*hw
)
173 struct zd_mac
*mac
= zd_hw_mac(hw
);
174 struct zd_chip
*chip
= &mac
->chip
;
176 u8 default_regdomain
;
178 r
= zd_chip_enable_int(chip
);
181 r
= zd_chip_init_hw(chip
);
185 ZD_ASSERT(!irqs_disabled());
187 r
= zd_read_regdomain(chip
, &default_regdomain
);
190 spin_lock_irq(&mac
->lock
);
191 mac
->regdomain
= mac
->default_regdomain
= default_regdomain
;
192 spin_unlock_irq(&mac
->lock
);
194 /* We must inform the device that we are doing encryption/decryption in
195 * software at the moment. */
196 r
= zd_set_encryption_type(chip
, ENC_SNIFFER
);
200 r
= zd_reg2alpha2(mac
->regdomain
, alpha2
);
204 r
= regulatory_hint(hw
->wiphy
, alpha2
);
206 zd_chip_disable_int(chip
);
211 void zd_mac_clear(struct zd_mac
*mac
)
213 flush_workqueue(zd_workqueue
);
214 zd_chip_clear(&mac
->chip
);
215 ZD_ASSERT(!spin_is_locked(&mac
->lock
));
216 ZD_MEMCLEAR(mac
, sizeof(struct zd_mac
));
219 static int set_rx_filter(struct zd_mac
*mac
)
222 u32 filter
= STA_RX_FILTER
;
224 spin_lock_irqsave(&mac
->lock
, flags
);
226 filter
|= RX_FILTER_CTRL
;
227 spin_unlock_irqrestore(&mac
->lock
, flags
);
229 return zd_iowrite32(&mac
->chip
, CR_RX_FILTER
, filter
);
232 static int set_mc_hash(struct zd_mac
*mac
)
234 struct zd_mc_hash hash
;
236 return zd_chip_set_multicast_hash(&mac
->chip
, &hash
);
239 static int zd_op_start(struct ieee80211_hw
*hw
)
241 struct zd_mac
*mac
= zd_hw_mac(hw
);
242 struct zd_chip
*chip
= &mac
->chip
;
243 struct zd_usb
*usb
= &chip
->usb
;
246 if (!usb
->initialized
) {
247 r
= zd_usb_init_hw(usb
);
252 r
= zd_chip_enable_int(chip
);
256 r
= zd_chip_set_basic_rates(chip
, CR_RATES_80211B
| CR_RATES_80211G
);
259 r
= set_rx_filter(mac
);
262 r
= set_mc_hash(mac
);
265 r
= zd_chip_switch_radio_on(chip
);
268 r
= zd_chip_enable_rxtx(chip
);
271 r
= zd_chip_enable_hwint(chip
);
275 housekeeping_enable(mac
);
278 zd_chip_disable_rxtx(chip
);
280 zd_chip_switch_radio_off(chip
);
282 zd_chip_disable_int(chip
);
287 static void zd_op_stop(struct ieee80211_hw
*hw
)
289 struct zd_mac
*mac
= zd_hw_mac(hw
);
290 struct zd_chip
*chip
= &mac
->chip
;
292 struct sk_buff_head
*ack_wait_queue
= &mac
->ack_wait_queue
;
294 /* The order here deliberately is a little different from the open()
295 * method, since we need to make sure there is no opportunity for RX
296 * frames to be processed by mac80211 after we have stopped it.
299 zd_chip_disable_rxtx(chip
);
300 housekeeping_disable(mac
);
301 flush_workqueue(zd_workqueue
);
303 zd_chip_disable_hwint(chip
);
304 zd_chip_switch_radio_off(chip
);
305 zd_chip_disable_int(chip
);
308 while ((skb
= skb_dequeue(ack_wait_queue
)))
309 dev_kfree_skb_any(skb
);
313 * zd_mac_tx_status - reports tx status of a packet if required
314 * @hw - a &struct ieee80211_hw pointer
316 * @flags: extra flags to set in the TX status info
317 * @ackssi: ACK signal strength
318 * @success - True for successful transmission of the frame
320 * This information calls ieee80211_tx_status_irqsafe() if required by the
321 * control information. It copies the control information into the status
324 * If no status information has been requested, the skb is freed.
326 static void zd_mac_tx_status(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
327 int ackssi
, struct tx_status
*tx_status
)
329 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
331 int success
= 1, retry
= 1;
333 const struct tx_retry_rate
*retries
;
335 ieee80211_tx_info_clear_status(info
);
338 success
= !tx_status
->failure
;
339 retry
= tx_status
->retry
+ success
;
344 info
->flags
|= IEEE80211_TX_STAT_ACK
;
347 info
->flags
&= ~IEEE80211_TX_STAT_ACK
;
350 first_idx
= info
->status
.rates
[0].idx
;
351 ZD_ASSERT(0<=first_idx
&& first_idx
<ARRAY_SIZE(zd_retry_rates
));
352 retries
= &zd_retry_rates
[first_idx
];
353 ZD_ASSERT(0<=retry
&& retry
<=retries
->count
);
355 info
->status
.rates
[0].idx
= retries
->rate
[0];
356 info
->status
.rates
[0].count
= 1; // (retry > 1 ? 2 : 1);
358 for (i
=1; i
<IEEE80211_TX_MAX_RATES
-1 && i
<retry
; i
++) {
359 info
->status
.rates
[i
].idx
= retries
->rate
[i
];
360 info
->status
.rates
[i
].count
= 1; // ((i==retry-1) && success ? 1:2);
362 for (; i
<IEEE80211_TX_MAX_RATES
&& i
<retry
; i
++) {
363 info
->status
.rates
[i
].idx
= retries
->rate
[retry
-1];
364 info
->status
.rates
[i
].count
= 1; // (success ? 1:2);
366 if (i
<IEEE80211_TX_MAX_RATES
)
367 info
->status
.rates
[i
].idx
= -1; /* terminate */
369 info
->status
.ack_signal
= ackssi
;
370 ieee80211_tx_status_irqsafe(hw
, skb
);
374 * zd_mac_tx_failed - callback for failed frames
375 * @dev: the mac80211 wireless device
377 * This function is called if a frame couldn't be successfully
378 * transferred. The first frame from the tx queue, will be selected and
379 * reported as error to the upper layers.
381 void zd_mac_tx_failed(struct urb
*urb
)
383 struct ieee80211_hw
* hw
= zd_usb_to_hw(urb
->context
);
384 struct zd_mac
*mac
= zd_hw_mac(hw
);
385 struct sk_buff_head
*q
= &mac
->ack_wait_queue
;
387 struct tx_status
*tx_status
= (struct tx_status
*)urb
->transfer_buffer
;
389 int success
= !tx_status
->failure
;
390 int retry
= tx_status
->retry
+ success
;
394 q
= &mac
->ack_wait_queue
;
395 spin_lock_irqsave(&q
->lock
, flags
);
397 skb_queue_walk(q
, skb
) {
398 struct ieee80211_hdr
*tx_hdr
;
399 struct ieee80211_tx_info
*info
;
400 int first_idx
, final_idx
;
401 const struct tx_retry_rate
*retries
;
406 /* if the hardware reports a failure and we had a 802.11 ACK
407 * pending, then we skip the first skb when searching for a
409 if (tx_status
->failure
&& mac
->ack_pending
&&
410 skb_queue_is_first(q
, skb
)) {
414 tx_hdr
= (struct ieee80211_hdr
*)skb
->data
;
416 /* we skip all frames not matching the reported destination */
417 if (unlikely(memcmp(tx_hdr
->addr1
, tx_status
->mac
, ETH_ALEN
))) {
421 /* we skip all frames not matching the reported final rate */
423 info
= IEEE80211_SKB_CB(skb
);
424 first_idx
= info
->status
.rates
[0].idx
;
425 ZD_ASSERT(0<=first_idx
&& first_idx
<ARRAY_SIZE(zd_retry_rates
));
426 retries
= &zd_retry_rates
[first_idx
];
427 if (retry
< 0 || retry
> retries
->count
) {
431 ZD_ASSERT(0<=retry
&& retry
<=retries
->count
);
432 final_idx
= retries
->rate
[retry
-1];
433 final_rate
= zd_rates
[final_idx
].hw_value
;
435 if (final_rate
!= tx_status
->rate
) {
444 for (i
=1; i
<=position
; i
++) {
445 skb
= __skb_dequeue(q
);
446 zd_mac_tx_status(hw
, skb
,
447 mac
->ack_pending
? mac
->ack_signal
: 0,
448 i
== position
? tx_status
: NULL
);
449 mac
->ack_pending
= 0;
453 spin_unlock_irqrestore(&q
->lock
, flags
);
457 * zd_mac_tx_to_dev - callback for USB layer
458 * @skb: a &sk_buff pointer
459 * @error: error value, 0 if transmission successful
461 * Informs the MAC layer that the frame has successfully transferred to the
462 * device. If an ACK is required and the transfer to the device has been
463 * successful, the packets are put on the @ack_wait_queue with
464 * the control set removed.
466 void zd_mac_tx_to_dev(struct sk_buff
*skb
, int error
)
468 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
469 struct ieee80211_hw
*hw
= info
->rate_driver_data
[0];
470 struct zd_mac
*mac
= zd_hw_mac(hw
);
472 ieee80211_tx_info_clear_status(info
);
474 skb_pull(skb
, sizeof(struct zd_ctrlset
));
475 if (unlikely(error
||
476 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
))) {
478 * FIXME : do we need to fill in anything ?
480 ieee80211_tx_status_irqsafe(hw
, skb
);
482 struct sk_buff_head
*q
= &mac
->ack_wait_queue
;
484 skb_queue_tail(q
, skb
);
485 while (skb_queue_len(q
) > ZD_MAC_MAX_ACK_WAITERS
) {
486 zd_mac_tx_status(hw
, skb_dequeue(q
),
487 mac
->ack_pending
? mac
->ack_signal
: 0,
489 mac
->ack_pending
= 0;
494 static int zd_calc_tx_length_us(u8
*service
, u8 zd_rate
, u16 tx_length
)
496 /* ZD_PURE_RATE() must be used to remove the modulation type flag of
497 * the zd-rate values.
499 static const u8 rate_divisor
[] = {
500 [ZD_PURE_RATE(ZD_CCK_RATE_1M
)] = 1,
501 [ZD_PURE_RATE(ZD_CCK_RATE_2M
)] = 2,
502 /* Bits must be doubled. */
503 [ZD_PURE_RATE(ZD_CCK_RATE_5_5M
)] = 11,
504 [ZD_PURE_RATE(ZD_CCK_RATE_11M
)] = 11,
505 [ZD_PURE_RATE(ZD_OFDM_RATE_6M
)] = 6,
506 [ZD_PURE_RATE(ZD_OFDM_RATE_9M
)] = 9,
507 [ZD_PURE_RATE(ZD_OFDM_RATE_12M
)] = 12,
508 [ZD_PURE_RATE(ZD_OFDM_RATE_18M
)] = 18,
509 [ZD_PURE_RATE(ZD_OFDM_RATE_24M
)] = 24,
510 [ZD_PURE_RATE(ZD_OFDM_RATE_36M
)] = 36,
511 [ZD_PURE_RATE(ZD_OFDM_RATE_48M
)] = 48,
512 [ZD_PURE_RATE(ZD_OFDM_RATE_54M
)] = 54,
515 u32 bits
= (u32
)tx_length
* 8;
518 divisor
= rate_divisor
[ZD_PURE_RATE(zd_rate
)];
523 case ZD_CCK_RATE_5_5M
:
524 bits
= (2*bits
) + 10; /* round up to the next integer */
526 case ZD_CCK_RATE_11M
:
529 *service
&= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION
;
530 if (0 < t
&& t
<= 3) {
531 *service
|= ZD_PLCP_SERVICE_LENGTH_EXTENSION
;
534 bits
+= 10; /* round up to the next integer */
541 static void cs_set_control(struct zd_mac
*mac
, struct zd_ctrlset
*cs
,
542 struct ieee80211_hdr
*header
,
543 struct ieee80211_tx_info
*info
)
547 * - if backoff needed, enable bit 0
548 * - if burst (backoff not needed) disable bit 0
554 if (info
->flags
& IEEE80211_TX_CTL_FIRST_FRAGMENT
)
555 cs
->control
|= ZD_CS_NEED_RANDOM_BACKOFF
;
557 /* No ACK expected (multicast, etc.) */
558 if (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
559 cs
->control
|= ZD_CS_NO_ACK
;
562 if (ieee80211_is_pspoll(header
->frame_control
))
563 cs
->control
|= ZD_CS_PS_POLL_FRAME
;
565 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_RTS_CTS
)
566 cs
->control
|= ZD_CS_RTS
;
568 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_CTS_PROTECT
)
569 cs
->control
|= ZD_CS_SELF_CTS
;
571 /* FIXME: Management frame? */
574 static int zd_mac_config_beacon(struct ieee80211_hw
*hw
, struct sk_buff
*beacon
)
576 struct zd_mac
*mac
= zd_hw_mac(hw
);
579 /* 4 more bytes for tail CRC */
580 u32 full_len
= beacon
->len
+ 4;
582 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, 0);
585 r
= zd_ioread32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, &tmp
);
590 r
= zd_ioread32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, &tmp
);
593 if ((++j
% 100) == 0) {
594 printk(KERN_ERR
"CR_BCN_FIFO_SEMAPHORE not ready\n");
596 printk(KERN_ERR
"Giving up beacon config.\n");
603 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO
, full_len
- 1);
606 if (zd_chip_is_zd1211b(&mac
->chip
)) {
607 r
= zd_iowrite32(&mac
->chip
, CR_BCN_LENGTH
, full_len
- 1);
612 for (j
= 0 ; j
< beacon
->len
; j
++) {
613 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO
,
614 *((u8
*)(beacon
->data
+ j
)));
619 for (j
= 0; j
< 4; j
++) {
620 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO
, 0x0);
625 r
= zd_iowrite32(&mac
->chip
, CR_BCN_FIFO_SEMAPHORE
, 1);
629 /* 802.11b/g 2.4G CCK 1Mb
630 * 802.11a, not yet implemented, uses different values (see GPL vendor
633 return zd_iowrite32(&mac
->chip
, CR_BCN_PLCP_CFG
, 0x00000400 |
637 static int fill_ctrlset(struct zd_mac
*mac
,
641 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
642 unsigned int frag_len
= skb
->len
+ FCS_LEN
;
643 unsigned int packet_length
;
644 struct ieee80211_rate
*txrate
;
645 struct zd_ctrlset
*cs
= (struct zd_ctrlset
*)
646 skb_push(skb
, sizeof(struct zd_ctrlset
));
647 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
649 ZD_ASSERT(frag_len
<= 0xffff);
651 txrate
= ieee80211_get_tx_rate(mac
->hw
, info
);
653 cs
->modulation
= txrate
->hw_value
;
654 if (info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_SHORT_PREAMBLE
)
655 cs
->modulation
= txrate
->hw_value_short
;
657 cs
->tx_length
= cpu_to_le16(frag_len
);
659 cs_set_control(mac
, cs
, hdr
, info
);
661 packet_length
= frag_len
+ sizeof(struct zd_ctrlset
) + 10;
662 ZD_ASSERT(packet_length
<= 0xffff);
663 /* ZD1211B: Computing the length difference this way, gives us
664 * flexibility to compute the packet length.
666 cs
->packet_length
= cpu_to_le16(zd_chip_is_zd1211b(&mac
->chip
) ?
667 packet_length
- frag_len
: packet_length
);
671 * - transmit frame length in microseconds
672 * - seems to be derived from frame length
673 * - see Cal_Us_Service() in zdinlinef.h
674 * - if macp->bTxBurstEnable is enabled, then multiply by 4
675 * - bTxBurstEnable is never set in the vendor driver
678 * - "for PLCP configuration"
679 * - always 0 except in some situations at 802.11b 11M
680 * - see line 53 of zdinlinef.h
683 r
= zd_calc_tx_length_us(&cs
->service
, ZD_RATE(cs
->modulation
),
684 le16_to_cpu(cs
->tx_length
));
687 cs
->current_length
= cpu_to_le16(r
);
688 cs
->next_frame_length
= 0;
694 * zd_op_tx - transmits a network frame to the device
696 * @dev: mac80211 hardware device
697 * @skb: socket buffer
698 * @control: the control structure
700 * This function transmit an IEEE 802.11 network frame to the device. The
701 * control block of the skbuff will be initialized. If necessary the incoming
702 * mac80211 queues will be stopped.
704 static int zd_op_tx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
706 struct zd_mac
*mac
= zd_hw_mac(hw
);
707 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
710 r
= fill_ctrlset(mac
, skb
);
714 info
->rate_driver_data
[0] = hw
;
716 r
= zd_usb_tx(&mac
->chip
.usb
, skb
);
727 * filter_ack - filters incoming packets for acknowledgements
728 * @dev: the mac80211 device
729 * @rx_hdr: received header
730 * @stats: the status for the received packet
732 * This functions looks for ACK packets and tries to match them with the
733 * frames in the tx queue. If a match is found the frame will be dequeued and
734 * the upper layers is informed about the successful transmission. If
735 * mac80211 queues have been stopped and the number of frames still to be
736 * transmitted is low the queues will be opened again.
738 * Returns 1 if the frame was an ACK, 0 if it was ignored.
740 static int filter_ack(struct ieee80211_hw
*hw
, struct ieee80211_hdr
*rx_hdr
,
741 struct ieee80211_rx_status
*stats
)
743 struct zd_mac
*mac
= zd_hw_mac(hw
);
745 struct sk_buff_head
*q
;
750 if (!ieee80211_is_ack(rx_hdr
->frame_control
))
753 q
= &mac
->ack_wait_queue
;
754 spin_lock_irqsave(&q
->lock
, flags
);
755 skb_queue_walk(q
, skb
) {
756 struct ieee80211_hdr
*tx_hdr
;
760 if (mac
->ack_pending
&& skb_queue_is_first(q
, skb
))
763 tx_hdr
= (struct ieee80211_hdr
*)skb
->data
;
764 if (likely(!memcmp(tx_hdr
->addr2
, rx_hdr
->addr1
, ETH_ALEN
)))
772 for (i
=1; i
<position
; i
++) {
773 skb
= __skb_dequeue(q
);
774 zd_mac_tx_status(hw
, skb
,
775 mac
->ack_pending
? mac
->ack_signal
: 0,
777 mac
->ack_pending
= 0;
780 mac
->ack_pending
= 1;
781 mac
->ack_signal
= stats
->signal
;
784 spin_unlock_irqrestore(&q
->lock
, flags
);
788 int zd_mac_rx(struct ieee80211_hw
*hw
, const u8
*buffer
, unsigned int length
)
790 struct zd_mac
*mac
= zd_hw_mac(hw
);
791 struct ieee80211_rx_status stats
;
792 const struct rx_status
*status
;
800 if (length
< ZD_PLCP_HEADER_SIZE
+ 10 /* IEEE80211_1ADDR_LEN */ +
801 FCS_LEN
+ sizeof(struct rx_status
))
804 memset(&stats
, 0, sizeof(stats
));
806 /* Note about pass_failed_fcs and pass_ctrl access below:
807 * mac locking intentionally omitted here, as this is the only unlocked
808 * reader and the only writer is configure_filter. Plus, if there were
809 * any races accessing these variables, it wouldn't really matter.
810 * If mac80211 ever provides a way for us to access filter flags
811 * from outside configure_filter, we could improve on this. Also, this
812 * situation may change once we implement some kind of DMA-into-skb
815 /* Caller has to ensure that length >= sizeof(struct rx_status). */
816 status
= (struct rx_status
*)
817 (buffer
+ (length
- sizeof(struct rx_status
)));
818 if (status
->frame_status
& ZD_RX_ERROR
) {
819 if (mac
->pass_failed_fcs
&&
820 (status
->frame_status
& ZD_RX_CRC32_ERROR
)) {
821 stats
.flag
|= RX_FLAG_FAILED_FCS_CRC
;
828 stats
.freq
= zd_channels
[_zd_chip_get_channel(&mac
->chip
) - 1].center_freq
;
829 stats
.band
= IEEE80211_BAND_2GHZ
;
830 stats
.signal
= status
->signal_strength
;
832 rate
= zd_rx_rate(buffer
, status
);
834 /* todo: return index in the big switches in zd_rx_rate instead */
835 for (i
= 0; i
< mac
->band
.n_bitrates
; i
++)
836 if (rate
== mac
->band
.bitrates
[i
].hw_value
)
839 length
-= ZD_PLCP_HEADER_SIZE
+ sizeof(struct rx_status
);
840 buffer
+= ZD_PLCP_HEADER_SIZE
;
842 /* Except for bad frames, filter each frame to see if it is an ACK, in
843 * which case our internal TX tracking is updated. Normally we then
844 * bail here as there's no need to pass ACKs on up to the stack, but
845 * there is also the case where the stack has requested us to pass
846 * control frames on up (pass_ctrl) which we must consider. */
848 filter_ack(hw
, (struct ieee80211_hdr
*)buffer
, &stats
)
852 fc
= get_unaligned((__le16
*)buffer
);
853 need_padding
= ieee80211_is_data_qos(fc
) ^ ieee80211_has_a4(fc
);
855 skb
= dev_alloc_skb(length
+ (need_padding
? 2 : 0));
859 /* Make sure the the payload data is 4 byte aligned. */
863 /* FIXME : could we avoid this big memcpy ? */
864 memcpy(skb_put(skb
, length
), buffer
, length
);
866 memcpy(IEEE80211_SKB_RXCB(skb
), &stats
, sizeof(stats
));
867 ieee80211_rx_irqsafe(hw
, skb
);
871 static int zd_op_add_interface(struct ieee80211_hw
*hw
,
872 struct ieee80211_if_init_conf
*conf
)
874 struct zd_mac
*mac
= zd_hw_mac(hw
);
876 /* using NL80211_IFTYPE_UNSPECIFIED to indicate no mode selected */
877 if (mac
->type
!= NL80211_IFTYPE_UNSPECIFIED
)
880 switch (conf
->type
) {
881 case NL80211_IFTYPE_MONITOR
:
882 case NL80211_IFTYPE_MESH_POINT
:
883 case NL80211_IFTYPE_STATION
:
884 case NL80211_IFTYPE_ADHOC
:
885 mac
->type
= conf
->type
;
891 return zd_write_mac_addr(&mac
->chip
, conf
->mac_addr
);
894 static void zd_op_remove_interface(struct ieee80211_hw
*hw
,
895 struct ieee80211_if_init_conf
*conf
)
897 struct zd_mac
*mac
= zd_hw_mac(hw
);
898 mac
->type
= NL80211_IFTYPE_UNSPECIFIED
;
899 zd_set_beacon_interval(&mac
->chip
, 0);
900 zd_write_mac_addr(&mac
->chip
, NULL
);
903 static int zd_op_config(struct ieee80211_hw
*hw
, u32 changed
)
905 struct zd_mac
*mac
= zd_hw_mac(hw
);
906 struct ieee80211_conf
*conf
= &hw
->conf
;
908 return zd_chip_set_channel(&mac
->chip
, conf
->channel
->hw_value
);
911 static void zd_process_intr(struct work_struct
*work
)
914 struct zd_mac
*mac
= container_of(work
, struct zd_mac
, process_intr
);
916 int_status
= le16_to_cpu(*(__le16
*)(mac
->intr_buffer
+4));
917 if (int_status
& INT_CFG_NEXT_BCN
)
918 dev_dbg_f_limit(zd_mac_dev(mac
), "INT_CFG_NEXT_BCN\n");
920 dev_dbg_f(zd_mac_dev(mac
), "Unsupported interrupt\n");
922 zd_chip_enable_hwint(&mac
->chip
);
926 static void set_multicast_hash_handler(struct work_struct
*work
)
929 container_of(work
, struct zd_mac
, set_multicast_hash_work
);
930 struct zd_mc_hash hash
;
932 spin_lock_irq(&mac
->lock
);
933 hash
= mac
->multicast_hash
;
934 spin_unlock_irq(&mac
->lock
);
936 zd_chip_set_multicast_hash(&mac
->chip
, &hash
);
939 static void set_rx_filter_handler(struct work_struct
*work
)
942 container_of(work
, struct zd_mac
, set_rx_filter_work
);
945 dev_dbg_f(zd_mac_dev(mac
), "\n");
946 r
= set_rx_filter(mac
);
948 dev_err(zd_mac_dev(mac
), "set_rx_filter_handler error %d\n", r
);
951 static u64
zd_op_prepare_multicast(struct ieee80211_hw
*hw
,
952 int mc_count
, struct dev_addr_list
*mclist
)
954 struct zd_mac
*mac
= zd_hw_mac(hw
);
955 struct zd_mc_hash hash
;
960 for (i
= 0; i
< mc_count
; i
++) {
963 dev_dbg_f(zd_mac_dev(mac
), "mc addr %pM\n", mclist
->dmi_addr
);
964 zd_mc_add_addr(&hash
, mclist
->dmi_addr
);
965 mclist
= mclist
->next
;
968 return hash
.low
| ((u64
)hash
.high
<< 32);
971 #define SUPPORTED_FIF_FLAGS \
972 (FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
973 FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
974 static void zd_op_configure_filter(struct ieee80211_hw
*hw
,
975 unsigned int changed_flags
,
976 unsigned int *new_flags
,
979 struct zd_mc_hash hash
= {
981 .high
= multicast
>> 32,
983 struct zd_mac
*mac
= zd_hw_mac(hw
);
986 /* Only deal with supported flags */
987 changed_flags
&= SUPPORTED_FIF_FLAGS
;
988 *new_flags
&= SUPPORTED_FIF_FLAGS
;
991 * If multicast parameter (as returned by zd_op_prepare_multicast)
992 * has changed, no bit in changed_flags is set. To handle this
993 * situation, we do not return if changed_flags is 0. If we do so,
994 * we will have some issue with IPv6 which uses multicast for link
995 * layer address resolution.
997 if (*new_flags
& (FIF_PROMISC_IN_BSS
| FIF_ALLMULTI
))
998 zd_mc_add_all(&hash
);
1000 spin_lock_irqsave(&mac
->lock
, flags
);
1001 mac
->pass_failed_fcs
= !!(*new_flags
& FIF_FCSFAIL
);
1002 mac
->pass_ctrl
= !!(*new_flags
& FIF_CONTROL
);
1003 mac
->multicast_hash
= hash
;
1004 spin_unlock_irqrestore(&mac
->lock
, flags
);
1006 /* XXX: these can be called here now, can sleep now! */
1007 queue_work(zd_workqueue
, &mac
->set_multicast_hash_work
);
1009 if (changed_flags
& FIF_CONTROL
)
1010 queue_work(zd_workqueue
, &mac
->set_rx_filter_work
);
1012 /* no handling required for FIF_OTHER_BSS as we don't currently
1013 * do BSSID filtering */
1014 /* FIXME: in future it would be nice to enable the probe response
1015 * filter (so that the driver doesn't see them) until
1016 * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
1017 * have to schedule work to enable prbresp reception, which might
1018 * happen too late. For now we'll just listen and forward them all the
1022 static void set_rts_cts_work(struct work_struct
*work
)
1024 struct zd_mac
*mac
=
1025 container_of(work
, struct zd_mac
, set_rts_cts_work
);
1026 unsigned long flags
;
1027 unsigned int short_preamble
;
1029 mutex_lock(&mac
->chip
.mutex
);
1031 spin_lock_irqsave(&mac
->lock
, flags
);
1032 mac
->updating_rts_rate
= 0;
1033 short_preamble
= mac
->short_preamble
;
1034 spin_unlock_irqrestore(&mac
->lock
, flags
);
1036 zd_chip_set_rts_cts_rate_locked(&mac
->chip
, short_preamble
);
1037 mutex_unlock(&mac
->chip
.mutex
);
1040 static void zd_op_bss_info_changed(struct ieee80211_hw
*hw
,
1041 struct ieee80211_vif
*vif
,
1042 struct ieee80211_bss_conf
*bss_conf
,
1045 struct zd_mac
*mac
= zd_hw_mac(hw
);
1046 unsigned long flags
;
1049 dev_dbg_f(zd_mac_dev(mac
), "changes: %x\n", changes
);
1051 if (mac
->type
== NL80211_IFTYPE_MESH_POINT
||
1052 mac
->type
== NL80211_IFTYPE_ADHOC
) {
1054 if (changes
& BSS_CHANGED_BEACON
) {
1055 struct sk_buff
*beacon
= ieee80211_beacon_get(hw
, vif
);
1058 zd_mac_config_beacon(hw
, beacon
);
1063 if (changes
& BSS_CHANGED_BEACON_ENABLED
) {
1066 if (bss_conf
->enable_beacon
)
1067 interval
= BCN_MODE_IBSS
|
1068 bss_conf
->beacon_int
;
1072 zd_set_beacon_interval(&mac
->chip
, interval
);
1075 associated
= is_valid_ether_addr(bss_conf
->bssid
);
1077 spin_lock_irq(&mac
->lock
);
1078 mac
->associated
= associated
;
1079 spin_unlock_irq(&mac
->lock
);
1081 /* TODO: do hardware bssid filtering */
1083 if (changes
& BSS_CHANGED_ERP_PREAMBLE
) {
1084 spin_lock_irqsave(&mac
->lock
, flags
);
1085 mac
->short_preamble
= bss_conf
->use_short_preamble
;
1086 if (!mac
->updating_rts_rate
) {
1087 mac
->updating_rts_rate
= 1;
1088 /* FIXME: should disable TX here, until work has
1089 * completed and RTS_CTS reg is updated */
1090 queue_work(zd_workqueue
, &mac
->set_rts_cts_work
);
1092 spin_unlock_irqrestore(&mac
->lock
, flags
);
1096 static u64
zd_op_get_tsf(struct ieee80211_hw
*hw
)
1098 struct zd_mac
*mac
= zd_hw_mac(hw
);
1099 return zd_chip_get_tsf(&mac
->chip
);
1102 static const struct ieee80211_ops zd_ops
= {
1104 .start
= zd_op_start
,
1106 .add_interface
= zd_op_add_interface
,
1107 .remove_interface
= zd_op_remove_interface
,
1108 .config
= zd_op_config
,
1109 .prepare_multicast
= zd_op_prepare_multicast
,
1110 .configure_filter
= zd_op_configure_filter
,
1111 .bss_info_changed
= zd_op_bss_info_changed
,
1112 .get_tsf
= zd_op_get_tsf
,
1115 struct ieee80211_hw
*zd_mac_alloc_hw(struct usb_interface
*intf
)
1118 struct ieee80211_hw
*hw
;
1120 hw
= ieee80211_alloc_hw(sizeof(struct zd_mac
), &zd_ops
);
1122 dev_dbg_f(&intf
->dev
, "out of memory\n");
1126 mac
= zd_hw_mac(hw
);
1128 memset(mac
, 0, sizeof(*mac
));
1129 spin_lock_init(&mac
->lock
);
1132 mac
->type
= NL80211_IFTYPE_UNSPECIFIED
;
1134 memcpy(mac
->channels
, zd_channels
, sizeof(zd_channels
));
1135 memcpy(mac
->rates
, zd_rates
, sizeof(zd_rates
));
1136 mac
->band
.n_bitrates
= ARRAY_SIZE(zd_rates
);
1137 mac
->band
.bitrates
= mac
->rates
;
1138 mac
->band
.n_channels
= ARRAY_SIZE(zd_channels
);
1139 mac
->band
.channels
= mac
->channels
;
1141 hw
->wiphy
->bands
[IEEE80211_BAND_2GHZ
] = &mac
->band
;
1143 hw
->flags
= IEEE80211_HW_RX_INCLUDES_FCS
|
1144 IEEE80211_HW_SIGNAL_UNSPEC
;
1146 hw
->wiphy
->interface_modes
=
1147 BIT(NL80211_IFTYPE_MESH_POINT
) |
1148 BIT(NL80211_IFTYPE_STATION
) |
1149 BIT(NL80211_IFTYPE_ADHOC
);
1151 hw
->max_signal
= 100;
1153 hw
->extra_tx_headroom
= sizeof(struct zd_ctrlset
);
1156 * Tell mac80211 that we support multi rate retries
1158 hw
->max_rates
= IEEE80211_TX_MAX_RATES
;
1159 hw
->max_rate_tries
= 18; /* 9 rates * 2 retries/rate */
1161 skb_queue_head_init(&mac
->ack_wait_queue
);
1162 mac
->ack_pending
= 0;
1164 zd_chip_init(&mac
->chip
, hw
, intf
);
1165 housekeeping_init(mac
);
1166 INIT_WORK(&mac
->set_multicast_hash_work
, set_multicast_hash_handler
);
1167 INIT_WORK(&mac
->set_rts_cts_work
, set_rts_cts_work
);
1168 INIT_WORK(&mac
->set_rx_filter_work
, set_rx_filter_handler
);
1169 INIT_WORK(&mac
->process_intr
, zd_process_intr
);
1171 SET_IEEE80211_DEV(hw
, &intf
->dev
);
1175 #define LINK_LED_WORK_DELAY HZ
1177 static void link_led_handler(struct work_struct
*work
)
1179 struct zd_mac
*mac
=
1180 container_of(work
, struct zd_mac
, housekeeping
.link_led_work
.work
);
1181 struct zd_chip
*chip
= &mac
->chip
;
1185 spin_lock_irq(&mac
->lock
);
1186 is_associated
= mac
->associated
;
1187 spin_unlock_irq(&mac
->lock
);
1189 r
= zd_chip_control_leds(chip
,
1190 is_associated
? ZD_LED_ASSOCIATED
: ZD_LED_SCANNING
);
1192 dev_dbg_f(zd_mac_dev(mac
), "zd_chip_control_leds error %d\n", r
);
1194 queue_delayed_work(zd_workqueue
, &mac
->housekeeping
.link_led_work
,
1195 LINK_LED_WORK_DELAY
);
1198 static void housekeeping_init(struct zd_mac
*mac
)
1200 INIT_DELAYED_WORK(&mac
->housekeeping
.link_led_work
, link_led_handler
);
1203 static void housekeeping_enable(struct zd_mac
*mac
)
1205 dev_dbg_f(zd_mac_dev(mac
), "\n");
1206 queue_delayed_work(zd_workqueue
, &mac
->housekeeping
.link_led_work
,
1210 static void housekeeping_disable(struct zd_mac
*mac
)
1212 dev_dbg_f(zd_mac_dev(mac
), "\n");
1213 cancel_rearming_delayed_workqueue(zd_workqueue
,
1214 &mac
->housekeeping
.link_led_work
);
1215 zd_chip_control_leds(&mac
->chip
, ZD_LED_OFF
);