2 * Shared Transport Line discipline driver Core
3 * This hooks up ST KIM driver and ST LL driver
4 * Copyright (C) 2009-2010 Texas Instruments
5 * Author: Pavan Savoy <pavan_savoy@ti.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #define pr_fmt(fmt) "(stc): " fmt
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/init.h>
26 #include <linux/tty.h>
28 #include <linux/seq_file.h>
29 #include <linux/skbuff.h>
31 #include <linux/ti_wilink_st.h>
33 extern void st_kim_recv(void *, const unsigned char *, long);
34 void st_int_recv(void *, const unsigned char *, long);
35 /* function pointer pointing to either,
36 * st_kim_recv during registration to receive fw download responses
37 * st_int_recv after registration to receive proto stack responses
39 static void (*st_recv
) (void *, const unsigned char *, long);
41 /********************************************************************/
42 static void add_channel_to_table(struct st_data_s
*st_gdata
,
43 struct st_proto_s
*new_proto
)
45 pr_info("%s: id %d\n", __func__
, new_proto
->chnl_id
);
46 /* list now has the channel id as index itself */
47 st_gdata
->list
[new_proto
->chnl_id
] = new_proto
;
48 st_gdata
->is_registered
[new_proto
->chnl_id
] = true;
51 static void remove_channel_from_table(struct st_data_s
*st_gdata
,
52 struct st_proto_s
*proto
)
54 pr_info("%s: id %d\n", __func__
, proto
->chnl_id
);
55 /* st_gdata->list[proto->chnl_id] = NULL; */
56 st_gdata
->is_registered
[proto
->chnl_id
] = false;
60 * called from KIM during firmware download.
62 * This is a wrapper function to tty->ops->write_room.
63 * It returns number of free space available in
66 int st_get_uart_wr_room(struct st_data_s
*st_gdata
)
68 struct tty_struct
*tty
;
69 if (unlikely(st_gdata
== NULL
|| st_gdata
->tty
== NULL
)) {
70 pr_err("tty unavailable to perform write");
74 return tty
->ops
->write_room(tty
);
77 /* can be called in from
78 * -- KIM (during fw download)
79 * -- ST Core (during st_write)
81 * This is the internal write function - a wrapper
84 int st_int_write(struct st_data_s
*st_gdata
,
85 const unsigned char *data
, int count
)
87 struct tty_struct
*tty
;
88 if (unlikely(st_gdata
== NULL
|| st_gdata
->tty
== NULL
)) {
89 pr_err("tty unavailable to perform write");
94 print_hex_dump(KERN_DEBUG
, "<out<", DUMP_PREFIX_NONE
,
95 16, 1, data
, count
, 0);
97 return tty
->ops
->write(tty
, data
, count
);
102 * push the skb received to relevant
105 static void st_send_frame(unsigned char chnl_id
, struct st_data_s
*st_gdata
)
107 pr_debug(" %s(prot:%d) ", __func__
, chnl_id
);
110 (st_gdata
== NULL
|| st_gdata
->rx_skb
== NULL
111 || st_gdata
->is_registered
[chnl_id
] == false)) {
112 pr_err("chnl_id %d not registered, no data to send?",
114 kfree_skb(st_gdata
->rx_skb
);
118 * this shouldn't take long
119 * - should be just skb_queue_tail for the
120 * protocol stack driver
122 if (likely(st_gdata
->list
[chnl_id
]->recv
!= NULL
)) {
124 (st_gdata
->list
[chnl_id
]->recv
125 (st_gdata
->list
[chnl_id
]->priv_data
, st_gdata
->rx_skb
)
127 pr_err(" proto stack %d's ->recv failed", chnl_id
);
128 kfree_skb(st_gdata
->rx_skb
);
132 pr_err(" proto stack %d's ->recv null", chnl_id
);
133 kfree_skb(st_gdata
->rx_skb
);
140 * to call registration complete callbacks
141 * of all protocol stack drivers
142 * This function is being called with spin lock held, protocol drivers are
143 * only expected to complete their waits and do nothing more than that.
145 static void st_reg_complete(struct st_data_s
*st_gdata
, char err
)
148 pr_info(" %s ", __func__
);
149 for (i
= 0; i
< ST_MAX_CHANNELS
; i
++) {
150 if (likely(st_gdata
!= NULL
&&
151 st_gdata
->is_registered
[i
] == true &&
152 st_gdata
->list
[i
]->reg_complete_cb
!= NULL
)) {
153 st_gdata
->list
[i
]->reg_complete_cb
154 (st_gdata
->list
[i
]->priv_data
, err
);
155 pr_info("protocol %d's cb sent %d\n", i
, err
);
156 if (err
) { /* cleanup registered protocol */
157 st_gdata
->protos_registered
--;
158 st_gdata
->is_registered
[i
] = false;
164 static inline int st_check_data_len(struct st_data_s
*st_gdata
,
165 unsigned char chnl_id
, int len
)
167 int room
= skb_tailroom(st_gdata
->rx_skb
);
169 pr_debug("len %d room %d", len
, room
);
172 /* Received packet has only packet header and
173 * has zero length payload. So, ask ST CORE to
174 * forward the packet to protocol driver (BT/FM/GPS)
176 st_send_frame(chnl_id
, st_gdata
);
178 } else if (len
> room
) {
179 /* Received packet's payload length is larger.
180 * We can't accommodate it in created skb.
182 pr_err("Data length is too large len %d room %d", len
,
184 kfree_skb(st_gdata
->rx_skb
);
186 /* Packet header has non-zero payload length and
187 * we have enough space in created skb. Lets read
189 st_gdata
->rx_state
= ST_W4_DATA
;
190 st_gdata
->rx_count
= len
;
194 /* Change ST state to continue to process next
196 st_gdata
->rx_state
= ST_W4_PACKET_TYPE
;
197 st_gdata
->rx_skb
= NULL
;
198 st_gdata
->rx_count
= 0;
199 st_gdata
->rx_chnl
= 0;
205 * st_wakeup_ack - internal function for action when wake-up ack
208 static inline void st_wakeup_ack(struct st_data_s
*st_gdata
,
211 struct sk_buff
*waiting_skb
;
212 unsigned long flags
= 0;
214 spin_lock_irqsave(&st_gdata
->lock
, flags
);
215 /* de-Q from waitQ and Q in txQ now that the
218 while ((waiting_skb
= skb_dequeue(&st_gdata
->tx_waitq
)))
219 skb_queue_tail(&st_gdata
->txq
, waiting_skb
);
221 /* state forwarded to ST LL */
222 st_ll_sleep_state(st_gdata
, (unsigned long)cmd
);
223 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
225 /* wake up to send the recently copied skbs from waitQ */
226 st_tx_wakeup(st_gdata
);
230 * st_int_recv - ST's internal receive function.
231 * Decodes received RAW data and forwards to corresponding
232 * client drivers (Bluetooth,FM,GPS..etc).
233 * This can receive various types of packets,
234 * HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets
235 * CH-8 packets from FM, CH-9 packets from GPS cores.
237 void st_int_recv(void *disc_data
,
238 const unsigned char *data
, long count
)
241 struct st_proto_s
*proto
;
242 unsigned short payload_len
= 0;
243 int len
= 0, type
= 0;
245 struct st_data_s
*st_gdata
= (struct st_data_s
*)disc_data
;
249 /* tty_receive sent null ? */
250 if (unlikely(ptr
== NULL
) || (st_gdata
== NULL
)) {
251 pr_err(" received null from TTY ");
255 pr_debug("count %ld rx_state %ld"
256 "rx_count %ld", count
, st_gdata
->rx_state
,
259 spin_lock_irqsave(&st_gdata
->lock
, flags
);
260 /* Decode received bytes here */
262 if (st_gdata
->rx_count
) {
263 len
= min_t(unsigned int, st_gdata
->rx_count
, count
);
264 memcpy(skb_put(st_gdata
->rx_skb
, len
), ptr
, len
);
265 st_gdata
->rx_count
-= len
;
269 if (st_gdata
->rx_count
)
272 /* Check ST RX state machine , where are we? */
273 switch (st_gdata
->rx_state
) {
274 /* Waiting for complete packet ? */
276 pr_debug("Complete pkt received");
277 /* Ask ST CORE to forward
278 * the packet to protocol driver */
279 st_send_frame(st_gdata
->rx_chnl
, st_gdata
);
281 st_gdata
->rx_state
= ST_W4_PACKET_TYPE
;
282 st_gdata
->rx_skb
= NULL
;
284 /* parse the header to know details */
286 proto
= st_gdata
->list
[st_gdata
->rx_chnl
];
288 &st_gdata
->rx_skb
->data
289 [proto
->offset_len_in_hdr
];
290 pr_debug("plen pointing to %x\n", *plen
);
291 if (proto
->len_size
== 1)/* 1 byte len field */
292 payload_len
= *(unsigned char *)plen
;
293 else if (proto
->len_size
== 2)
295 __le16_to_cpu(*(unsigned short *)plen
);
297 pr_info("%s: invalid length "
299 __func__
, proto
->chnl_id
);
300 st_check_data_len(st_gdata
, proto
->chnl_id
,
302 pr_debug("off %d, pay len %d\n",
303 proto
->offset_len_in_hdr
, payload_len
);
305 } /* end of switch rx_state */
308 /* end of if rx_count */
309 /* Check first byte of packet and identify module
310 * owner (BT/FM/GPS) */
315 pr_debug("PM packet");
316 /* this takes appropriate action based on
317 * sleep state received --
319 st_ll_sleep_state(st_gdata
, *ptr
);
320 /* if WAKEUP_IND collides copy from waitq to txq
321 * and assume chip awake
323 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
324 if (st_ll_getstate(st_gdata
) == ST_LL_AWAKE
)
325 st_wakeup_ack(st_gdata
, LL_WAKE_UP_ACK
);
326 spin_lock_irqsave(&st_gdata
->lock
, flags
);
332 pr_debug("PM packet");
334 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
335 /* wake up ack received */
336 st_wakeup_ack(st_gdata
, *ptr
);
337 spin_lock_irqsave(&st_gdata
->lock
, flags
);
345 if (st_gdata
->list
[type
] == NULL
) {
346 pr_err("chip/interface misbehavior dropping"
347 " frame starting with 0x%02x", type
);
351 st_gdata
->rx_skb
= alloc_skb(
352 st_gdata
->list
[type
]->max_frame_size
,
354 if (st_gdata
->rx_skb
== NULL
) {
355 pr_err("out of memory: dropping\n");
359 skb_reserve(st_gdata
->rx_skb
,
360 st_gdata
->list
[type
]->reserve
);
361 /* next 2 required for BT only */
362 st_gdata
->rx_skb
->cb
[0] = type
; /*pkt_type*/
363 st_gdata
->rx_skb
->cb
[1] = 0; /*incoming*/
364 st_gdata
->rx_chnl
= *ptr
;
365 st_gdata
->rx_state
= ST_W4_HEADER
;
366 st_gdata
->rx_count
= st_gdata
->list
[type
]->hdr_len
;
367 pr_debug("rx_count %ld\n", st_gdata
->rx_count
);
373 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
374 pr_debug("done %s", __func__
);
379 * st_int_dequeue - internal de-Q function.
380 * If the previous data set was not written
381 * completely, return that skb which has the pending data.
382 * In normal cases, return top of txq.
384 static struct sk_buff
*st_int_dequeue(struct st_data_s
*st_gdata
)
386 struct sk_buff
*returning_skb
;
388 pr_debug("%s", __func__
);
389 if (st_gdata
->tx_skb
!= NULL
) {
390 returning_skb
= st_gdata
->tx_skb
;
391 st_gdata
->tx_skb
= NULL
;
392 return returning_skb
;
394 return skb_dequeue(&st_gdata
->txq
);
398 * st_int_enqueue - internal Q-ing function.
399 * Will either Q the skb to txq or the tx_waitq
400 * depending on the ST LL state.
401 * If the chip is asleep, then Q it onto waitq and
403 * txq and waitq needs protection since the other contexts
404 * may be sending data, waking up chip.
406 static void st_int_enqueue(struct st_data_s
*st_gdata
, struct sk_buff
*skb
)
408 unsigned long flags
= 0;
410 pr_debug("%s", __func__
);
411 spin_lock_irqsave(&st_gdata
->lock
, flags
);
413 switch (st_ll_getstate(st_gdata
)) {
415 pr_debug("ST LL is AWAKE, sending normally");
416 skb_queue_tail(&st_gdata
->txq
, skb
);
418 case ST_LL_ASLEEP_TO_AWAKE
:
419 skb_queue_tail(&st_gdata
->tx_waitq
, skb
);
421 case ST_LL_AWAKE_TO_ASLEEP
:
422 pr_err("ST LL is illegal state(%ld),"
423 "purging received skb.", st_ll_getstate(st_gdata
));
427 skb_queue_tail(&st_gdata
->tx_waitq
, skb
);
428 st_ll_wakeup(st_gdata
);
431 pr_err("ST LL is illegal state(%ld),"
432 "purging received skb.", st_ll_getstate(st_gdata
));
437 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
438 pr_debug("done %s", __func__
);
443 * internal wakeup function
445 * - TTY layer when write's finished
446 * - st_write (in context of the protocol stack)
448 void st_tx_wakeup(struct st_data_s
*st_data
)
451 unsigned long flags
; /* for irq save flags */
452 pr_debug("%s", __func__
);
453 /* check for sending & set flag sending here */
454 if (test_and_set_bit(ST_TX_SENDING
, &st_data
->tx_state
)) {
455 pr_debug("ST already sending");
457 set_bit(ST_TX_WAKEUP
, &st_data
->tx_state
);
459 /* TX_WAKEUP will be checked in another
463 do { /* come back if st_tx_wakeup is set */
464 /* woke-up to write */
465 clear_bit(ST_TX_WAKEUP
, &st_data
->tx_state
);
466 while ((skb
= st_int_dequeue(st_data
))) {
468 spin_lock_irqsave(&st_data
->lock
, flags
);
469 /* enable wake-up from TTY */
470 set_bit(TTY_DO_WRITE_WAKEUP
, &st_data
->tty
->flags
);
471 len
= st_int_write(st_data
, skb
->data
, skb
->len
);
473 /* if skb->len = len as expected, skb->len=0 */
475 /* would be the next skb to be sent */
476 st_data
->tx_skb
= skb
;
477 spin_unlock_irqrestore(&st_data
->lock
, flags
);
481 spin_unlock_irqrestore(&st_data
->lock
, flags
);
483 /* if wake-up is set in another context- restart sending */
484 } while (test_bit(ST_TX_WAKEUP
, &st_data
->tx_state
));
486 /* clear flag sending */
487 clear_bit(ST_TX_SENDING
, &st_data
->tx_state
);
490 /********************************************************************/
491 /* functions called from ST KIM
493 void kim_st_list_protocols(struct st_data_s
*st_gdata
, void *buf
)
495 seq_printf(buf
, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n",
496 st_gdata
->protos_registered
,
497 st_gdata
->is_registered
[0x04] == true ? 'R' : 'U',
498 st_gdata
->is_registered
[0x08] == true ? 'R' : 'U',
499 st_gdata
->is_registered
[0x09] == true ? 'R' : 'U');
502 /********************************************************************/
504 * functions called from protocol stack drivers
507 long st_register(struct st_proto_s
*new_proto
)
509 struct st_data_s
*st_gdata
;
511 unsigned long flags
= 0;
513 st_kim_ref(&st_gdata
, 0);
514 pr_info("%s(%d) ", __func__
, new_proto
->chnl_id
);
515 if (st_gdata
== NULL
|| new_proto
== NULL
|| new_proto
->recv
== NULL
516 || new_proto
->reg_complete_cb
== NULL
) {
517 pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
521 if (new_proto
->chnl_id
>= ST_MAX_CHANNELS
) {
522 pr_err("chnl_id %d not supported", new_proto
->chnl_id
);
523 return -EPROTONOSUPPORT
;
526 if (st_gdata
->is_registered
[new_proto
->chnl_id
] == true) {
527 pr_err("chnl_id %d already registered", new_proto
->chnl_id
);
531 /* can be from process context only */
532 spin_lock_irqsave(&st_gdata
->lock
, flags
);
534 if (test_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
)) {
535 pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto
->chnl_id
);
536 /* fw download in progress */
538 add_channel_to_table(st_gdata
, new_proto
);
539 st_gdata
->protos_registered
++;
540 new_proto
->write
= st_write
;
542 set_bit(ST_REG_PENDING
, &st_gdata
->st_state
);
543 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
545 } else if (st_gdata
->protos_registered
== ST_EMPTY
) {
546 pr_info(" chnl_id list empty :%d ", new_proto
->chnl_id
);
547 set_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
);
548 st_recv
= st_kim_recv
;
550 /* enable the ST LL - to set default chip state */
551 st_ll_enable(st_gdata
);
553 /* release lock previously held - re-locked below */
554 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
556 /* this may take a while to complete
557 * since it involves BT fw download
559 err
= st_kim_start(st_gdata
->kim_data
);
561 clear_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
);
562 if ((st_gdata
->protos_registered
!= ST_EMPTY
) &&
563 (test_bit(ST_REG_PENDING
, &st_gdata
->st_state
))) {
564 pr_err(" KIM failure complete callback ");
565 st_reg_complete(st_gdata
, err
);
566 clear_bit(ST_REG_PENDING
, &st_gdata
->st_state
);
571 spin_lock_irqsave(&st_gdata
->lock
, flags
);
573 clear_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
);
574 st_recv
= st_int_recv
;
576 /* this is where all pending registration
577 * are signalled to be complete by calling callback functions
579 if ((st_gdata
->protos_registered
!= ST_EMPTY
) &&
580 (test_bit(ST_REG_PENDING
, &st_gdata
->st_state
))) {
581 pr_debug(" call reg complete callback ");
582 st_reg_complete(st_gdata
, 0);
584 clear_bit(ST_REG_PENDING
, &st_gdata
->st_state
);
586 /* check for already registered once more,
587 * since the above check is old
589 if (st_gdata
->is_registered
[new_proto
->chnl_id
] == true) {
590 pr_err(" proto %d already registered ",
592 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
596 add_channel_to_table(st_gdata
, new_proto
);
597 st_gdata
->protos_registered
++;
598 new_proto
->write
= st_write
;
599 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
602 /* if fw is already downloaded & new stack registers protocol */
604 add_channel_to_table(st_gdata
, new_proto
);
605 st_gdata
->protos_registered
++;
606 new_proto
->write
= st_write
;
608 /* lock already held before entering else */
609 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
612 pr_debug("done %s(%d) ", __func__
, new_proto
->chnl_id
);
614 EXPORT_SYMBOL_GPL(st_register
);
616 /* to unregister a protocol -
617 * to be called from protocol stack driver
619 long st_unregister(struct st_proto_s
*proto
)
622 unsigned long flags
= 0;
623 struct st_data_s
*st_gdata
;
625 pr_debug("%s: %d ", __func__
, proto
->chnl_id
);
627 st_kim_ref(&st_gdata
, 0);
628 if (!st_gdata
|| proto
->chnl_id
>= ST_MAX_CHANNELS
) {
629 pr_err(" chnl_id %d not supported", proto
->chnl_id
);
630 return -EPROTONOSUPPORT
;
633 spin_lock_irqsave(&st_gdata
->lock
, flags
);
635 if (st_gdata
->is_registered
[proto
->chnl_id
] == false) {
636 pr_err(" chnl_id %d not registered", proto
->chnl_id
);
637 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
638 return -EPROTONOSUPPORT
;
641 st_gdata
->protos_registered
--;
642 remove_channel_from_table(st_gdata
, proto
);
643 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
646 if (st_gdata
->protos_registered
< ST_EMPTY
)
647 st_gdata
->protos_registered
= ST_EMPTY
;
649 if ((st_gdata
->protos_registered
== ST_EMPTY
) &&
650 (!test_bit(ST_REG_PENDING
, &st_gdata
->st_state
))) {
651 pr_info(" all chnl_ids unregistered ");
653 /* stop traffic on tty */
655 tty_ldisc_flush(st_gdata
->tty
);
656 stop_tty(st_gdata
->tty
);
659 /* all chnl_ids now unregistered */
660 st_kim_stop(st_gdata
->kim_data
);
662 st_ll_disable(st_gdata
);
668 * called in protocol stack drivers
669 * via the write function pointer
671 long st_write(struct sk_buff
*skb
)
673 struct st_data_s
*st_gdata
;
676 st_kim_ref(&st_gdata
, 0);
677 if (unlikely(skb
== NULL
|| st_gdata
== NULL
678 || st_gdata
->tty
== NULL
)) {
679 pr_err("data/tty unavailable to perform write");
683 pr_debug("%d to be written", skb
->len
);
686 /* st_ll to decide where to enqueue the skb */
687 st_int_enqueue(st_gdata
, skb
);
689 st_tx_wakeup(st_gdata
);
691 /* return number of bytes written */
695 /* for protocols making use of shared transport */
696 EXPORT_SYMBOL_GPL(st_unregister
);
698 /********************************************************************/
700 * functions called from TTY layer
702 static int st_tty_open(struct tty_struct
*tty
)
705 struct st_data_s
*st_gdata
;
706 pr_info("%s ", __func__
);
708 st_kim_ref(&st_gdata
, 0);
710 tty
->disc_data
= st_gdata
;
712 /* don't do an wakeup for now */
713 clear_bit(TTY_DO_WRITE_WAKEUP
, &tty
->flags
);
715 /* mem already allocated
717 tty
->receive_room
= 65536;
718 /* Flush any pending characters in the driver and discipline. */
719 tty_ldisc_flush(tty
);
720 tty_driver_flush_buffer(tty
);
722 * signal to UIM via KIM that -
723 * installation of N_TI_WL ldisc is complete
725 st_kim_complete(st_gdata
->kim_data
);
726 pr_debug("done %s", __func__
);
730 static void st_tty_close(struct tty_struct
*tty
)
732 unsigned char i
= ST_MAX_CHANNELS
;
733 unsigned long flags
= 0;
734 struct st_data_s
*st_gdata
= tty
->disc_data
;
736 pr_info("%s ", __func__
);
739 * if a protocol has been registered & line discipline
740 * un-installed for some reason - what should be done ?
742 spin_lock_irqsave(&st_gdata
->lock
, flags
);
743 for (i
= ST_BT
; i
< ST_MAX_CHANNELS
; i
++) {
744 if (st_gdata
->is_registered
[i
] == true)
745 pr_err("%d not un-registered", i
);
746 st_gdata
->list
[i
] = NULL
;
747 st_gdata
->is_registered
[i
] = false;
749 st_gdata
->protos_registered
= 0;
750 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
752 * signal to UIM via KIM that -
753 * N_TI_WL ldisc is un-installed
755 st_kim_complete(st_gdata
->kim_data
);
756 st_gdata
->tty
= NULL
;
757 /* Flush any pending characters in the driver and discipline. */
758 tty_ldisc_flush(tty
);
759 tty_driver_flush_buffer(tty
);
761 spin_lock_irqsave(&st_gdata
->lock
, flags
);
762 /* empty out txq and tx_waitq */
763 skb_queue_purge(&st_gdata
->txq
);
764 skb_queue_purge(&st_gdata
->tx_waitq
);
765 /* reset the TTY Rx states of ST */
766 st_gdata
->rx_count
= 0;
767 st_gdata
->rx_state
= ST_W4_PACKET_TYPE
;
768 kfree_skb(st_gdata
->rx_skb
);
769 st_gdata
->rx_skb
= NULL
;
770 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
772 pr_debug("%s: done ", __func__
);
775 static void st_tty_receive(struct tty_struct
*tty
, const unsigned char *data
,
776 char *tty_flags
, int count
)
779 print_hex_dump(KERN_DEBUG
, ">in>", DUMP_PREFIX_NONE
,
780 16, 1, data
, count
, 0);
784 * if fw download is in progress then route incoming data
785 * to KIM for validation
787 st_recv(tty
->disc_data
, data
, count
);
788 pr_debug("done %s", __func__
);
791 /* wake-up function called in from the TTY layer
792 * inside the internal wakeup function will be called
794 static void st_tty_wakeup(struct tty_struct
*tty
)
796 struct st_data_s
*st_gdata
= tty
->disc_data
;
797 pr_debug("%s ", __func__
);
798 /* don't do an wakeup for now */
799 clear_bit(TTY_DO_WRITE_WAKEUP
, &tty
->flags
);
801 /* call our internal wakeup */
802 st_tx_wakeup((void *)st_gdata
);
805 static void st_tty_flush_buffer(struct tty_struct
*tty
)
807 struct st_data_s
*st_gdata
= tty
->disc_data
;
808 pr_debug("%s ", __func__
);
810 kfree_skb(st_gdata
->tx_skb
);
811 st_gdata
->tx_skb
= NULL
;
813 tty
->ops
->flush_buffer(tty
);
817 static struct tty_ldisc_ops st_ldisc_ops
= {
818 .magic
= TTY_LDISC_MAGIC
,
821 .close
= st_tty_close
,
822 .receive_buf
= st_tty_receive
,
823 .write_wakeup
= st_tty_wakeup
,
824 .flush_buffer
= st_tty_flush_buffer
,
828 /********************************************************************/
829 int st_core_init(struct st_data_s
**core_data
)
831 struct st_data_s
*st_gdata
;
834 err
= tty_register_ldisc(N_TI_WL
, &st_ldisc_ops
);
836 pr_err("error registering %d line discipline %ld",
840 pr_debug("registered n_shared line discipline");
842 st_gdata
= kzalloc(sizeof(struct st_data_s
), GFP_KERNEL
);
844 pr_err("memory allocation failed");
845 err
= tty_unregister_ldisc(N_TI_WL
);
847 pr_err("unable to un-register ldisc %ld", err
);
852 /* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's
853 * will be pushed in this queue for actual transmission.
855 skb_queue_head_init(&st_gdata
->txq
);
856 skb_queue_head_init(&st_gdata
->tx_waitq
);
858 /* Locking used in st_int_enqueue() to avoid multiple execution */
859 spin_lock_init(&st_gdata
->lock
);
861 err
= st_ll_init(st_gdata
);
863 pr_err("error during st_ll initialization(%ld)", err
);
865 err
= tty_unregister_ldisc(N_TI_WL
);
867 pr_err("unable to un-register ldisc");
870 *core_data
= st_gdata
;
874 void st_core_exit(struct st_data_s
*st_gdata
)
877 /* internal module cleanup */
878 err
= st_ll_deinit(st_gdata
);
880 pr_err("error during deinit of ST LL %ld", err
);
882 if (st_gdata
!= NULL
) {
883 /* Free ST Tx Qs and skbs */
884 skb_queue_purge(&st_gdata
->txq
);
885 skb_queue_purge(&st_gdata
->tx_waitq
);
886 kfree_skb(st_gdata
->rx_skb
);
887 kfree_skb(st_gdata
->tx_skb
);
888 /* TTY ldisc cleanup */
889 err
= tty_unregister_ldisc(N_TI_WL
);
891 pr_err("unable to un-register ldisc %ld", err
);
892 /* free the global data pointer */