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 /* function pointer pointing to either,
34 * st_kim_recv during registration to receive fw download responses
35 * st_int_recv after registration to receive proto stack responses
37 void (*st_recv
) (void*, const unsigned char*, long);
39 /********************************************************************/
40 static void add_channel_to_table(struct st_data_s
*st_gdata
,
41 struct st_proto_s
*new_proto
)
43 pr_info("%s: id %d\n", __func__
, new_proto
->chnl_id
);
44 /* list now has the channel id as index itself */
45 st_gdata
->list
[new_proto
->chnl_id
] = new_proto
;
46 st_gdata
->is_registered
[new_proto
->chnl_id
] = true;
49 static void remove_channel_from_table(struct st_data_s
*st_gdata
,
50 struct st_proto_s
*proto
)
52 pr_info("%s: id %d\n", __func__
, proto
->chnl_id
);
53 /* st_gdata->list[proto->chnl_id] = NULL; */
54 st_gdata
->is_registered
[proto
->chnl_id
] = false;
58 * called from KIM during firmware download.
60 * This is a wrapper function to tty->ops->write_room.
61 * It returns number of free space available in
64 int st_get_uart_wr_room(struct st_data_s
*st_gdata
)
66 struct tty_struct
*tty
;
67 if (unlikely(st_gdata
== NULL
|| st_gdata
->tty
== NULL
)) {
68 pr_err("tty unavailable to perform write");
72 return tty
->ops
->write_room(tty
);
75 /* can be called in from
76 * -- KIM (during fw download)
77 * -- ST Core (during st_write)
79 * This is the internal write function - a wrapper
82 int st_int_write(struct st_data_s
*st_gdata
,
83 const unsigned char *data
, int count
)
85 struct tty_struct
*tty
;
86 if (unlikely(st_gdata
== NULL
|| st_gdata
->tty
== NULL
)) {
87 pr_err("tty unavailable to perform write");
92 print_hex_dump(KERN_DEBUG
, "<out<", DUMP_PREFIX_NONE
,
93 16, 1, data
, count
, 0);
95 return tty
->ops
->write(tty
, data
, count
);
100 * push the skb received to relevant
103 void st_send_frame(unsigned char chnl_id
, struct st_data_s
*st_gdata
)
105 pr_debug(" %s(prot:%d) ", __func__
, chnl_id
);
108 (st_gdata
== NULL
|| st_gdata
->rx_skb
== NULL
109 || st_gdata
->is_registered
[chnl_id
] == false)) {
110 pr_err("chnl_id %d not registered, no data to send?",
112 kfree_skb(st_gdata
->rx_skb
);
116 * this shouldn't take long
117 * - should be just skb_queue_tail for the
118 * protocol stack driver
120 if (likely(st_gdata
->list
[chnl_id
]->recv
!= NULL
)) {
122 (st_gdata
->list
[chnl_id
]->recv
123 (st_gdata
->list
[chnl_id
]->priv_data
, st_gdata
->rx_skb
)
125 pr_err(" proto stack %d's ->recv failed", chnl_id
);
126 kfree_skb(st_gdata
->rx_skb
);
130 pr_err(" proto stack %d's ->recv null", chnl_id
);
131 kfree_skb(st_gdata
->rx_skb
);
138 * to call registration complete callbacks
139 * of all protocol stack drivers
141 void st_reg_complete(struct st_data_s
*st_gdata
, char err
)
144 pr_info(" %s ", __func__
);
145 for (i
= 0; i
< ST_MAX_CHANNELS
; i
++) {
146 if (likely(st_gdata
!= NULL
&&
147 st_gdata
->is_registered
[i
] == true &&
148 st_gdata
->list
[i
]->reg_complete_cb
!= NULL
)) {
149 st_gdata
->list
[i
]->reg_complete_cb
150 (st_gdata
->list
[i
]->priv_data
, err
);
151 pr_info("protocol %d's cb sent %d\n", i
, err
);
152 if (err
) { /* cleanup registered protocol */
153 st_gdata
->protos_registered
--;
154 st_gdata
->is_registered
[i
] = false;
160 static inline int st_check_data_len(struct st_data_s
*st_gdata
,
161 unsigned char chnl_id
, int len
)
163 int room
= skb_tailroom(st_gdata
->rx_skb
);
165 pr_debug("len %d room %d", len
, room
);
168 /* Received packet has only packet header and
169 * has zero length payload. So, ask ST CORE to
170 * forward the packet to protocol driver (BT/FM/GPS)
172 st_send_frame(chnl_id
, st_gdata
);
174 } else if (len
> room
) {
175 /* Received packet's payload length is larger.
176 * We can't accommodate it in created skb.
178 pr_err("Data length is too large len %d room %d", len
,
180 kfree_skb(st_gdata
->rx_skb
);
182 /* Packet header has non-zero payload length and
183 * we have enough space in created skb. Lets read
185 st_gdata
->rx_state
= ST_W4_DATA
;
186 st_gdata
->rx_count
= len
;
190 /* Change ST state to continue to process next
192 st_gdata
->rx_state
= ST_W4_PACKET_TYPE
;
193 st_gdata
->rx_skb
= NULL
;
194 st_gdata
->rx_count
= 0;
195 st_gdata
->rx_chnl
= 0;
201 * st_wakeup_ack - internal function for action when wake-up ack
204 static inline void st_wakeup_ack(struct st_data_s
*st_gdata
,
207 struct sk_buff
*waiting_skb
;
208 unsigned long flags
= 0;
210 spin_lock_irqsave(&st_gdata
->lock
, flags
);
211 /* de-Q from waitQ and Q in txQ now that the
214 while ((waiting_skb
= skb_dequeue(&st_gdata
->tx_waitq
)))
215 skb_queue_tail(&st_gdata
->txq
, waiting_skb
);
217 /* state forwarded to ST LL */
218 st_ll_sleep_state(st_gdata
, (unsigned long)cmd
);
219 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
221 /* wake up to send the recently copied skbs from waitQ */
222 st_tx_wakeup(st_gdata
);
226 * st_int_recv - ST's internal receive function.
227 * Decodes received RAW data and forwards to corresponding
228 * client drivers (Bluetooth,FM,GPS..etc).
229 * This can receive various types of packets,
230 * HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets
231 * CH-8 packets from FM, CH-9 packets from GPS cores.
233 void st_int_recv(void *disc_data
,
234 const unsigned char *data
, long count
)
237 struct st_proto_s
*proto
;
238 unsigned short payload_len
= 0;
239 int len
= 0, type
= 0;
241 struct st_data_s
*st_gdata
= (struct st_data_s
*)disc_data
;
245 /* tty_receive sent null ? */
246 if (unlikely(ptr
== NULL
) || (st_gdata
== NULL
)) {
247 pr_err(" received null from TTY ");
251 pr_debug("count %ld rx_state %ld"
252 "rx_count %ld", count
, st_gdata
->rx_state
,
255 spin_lock_irqsave(&st_gdata
->lock
, flags
);
256 /* Decode received bytes here */
258 if (st_gdata
->rx_count
) {
259 len
= min_t(unsigned int, st_gdata
->rx_count
, count
);
260 memcpy(skb_put(st_gdata
->rx_skb
, len
), ptr
, len
);
261 st_gdata
->rx_count
-= len
;
265 if (st_gdata
->rx_count
)
268 /* Check ST RX state machine , where are we? */
269 switch (st_gdata
->rx_state
) {
270 /* Waiting for complete packet ? */
272 pr_debug("Complete pkt received");
273 /* Ask ST CORE to forward
274 * the packet to protocol driver */
275 st_send_frame(st_gdata
->rx_chnl
, st_gdata
);
277 st_gdata
->rx_state
= ST_W4_PACKET_TYPE
;
278 st_gdata
->rx_skb
= NULL
;
280 /* parse the header to know details */
282 proto
= st_gdata
->list
[st_gdata
->rx_chnl
];
284 &st_gdata
->rx_skb
->data
285 [proto
->offset_len_in_hdr
];
286 pr_debug("plen pointing to %x\n", *plen
);
287 if (proto
->len_size
== 1)/* 1 byte len field */
288 payload_len
= *(unsigned char *)plen
;
289 else if (proto
->len_size
== 2)
291 __le16_to_cpu(*(unsigned short *)plen
);
293 pr_info("%s: invalid length "
295 __func__
, proto
->chnl_id
);
296 st_check_data_len(st_gdata
, proto
->chnl_id
,
298 pr_debug("off %d, pay len %d\n",
299 proto
->offset_len_in_hdr
, payload_len
);
301 } /* end of switch rx_state */
304 /* end of if rx_count */
305 /* Check first byte of packet and identify module
306 * owner (BT/FM/GPS) */
311 pr_debug("PM packet");
312 /* this takes appropriate action based on
313 * sleep state received --
315 st_ll_sleep_state(st_gdata
, *ptr
);
316 /* if WAKEUP_IND collides copy from waitq to txq
317 * and assume chip awake
319 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
320 if (st_ll_getstate(st_gdata
) == ST_LL_AWAKE
)
321 st_wakeup_ack(st_gdata
, LL_WAKE_UP_ACK
);
322 spin_lock_irqsave(&st_gdata
->lock
, flags
);
328 pr_debug("PM packet");
330 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
331 /* wake up ack received */
332 st_wakeup_ack(st_gdata
, *ptr
);
333 spin_lock_irqsave(&st_gdata
->lock
, flags
);
341 if (st_gdata
->list
[type
] == NULL
) {
342 pr_err("chip/interface misbehavior dropping"
343 " frame starting with 0x%02x", type
);
347 st_gdata
->rx_skb
= alloc_skb(
348 st_gdata
->list
[type
]->max_frame_size
,
350 skb_reserve(st_gdata
->rx_skb
,
351 st_gdata
->list
[type
]->reserve
);
352 /* next 2 required for BT only */
353 st_gdata
->rx_skb
->cb
[0] = type
; /*pkt_type*/
354 st_gdata
->rx_skb
->cb
[1] = 0; /*incoming*/
355 st_gdata
->rx_chnl
= *ptr
;
356 st_gdata
->rx_state
= ST_W4_HEADER
;
357 st_gdata
->rx_count
= st_gdata
->list
[type
]->hdr_len
;
358 pr_debug("rx_count %ld\n", st_gdata
->rx_count
);
364 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
365 pr_debug("done %s", __func__
);
370 * st_int_dequeue - internal de-Q function.
371 * If the previous data set was not written
372 * completely, return that skb which has the pending data.
373 * In normal cases, return top of txq.
375 struct sk_buff
*st_int_dequeue(struct st_data_s
*st_gdata
)
377 struct sk_buff
*returning_skb
;
379 pr_debug("%s", __func__
);
380 if (st_gdata
->tx_skb
!= NULL
) {
381 returning_skb
= st_gdata
->tx_skb
;
382 st_gdata
->tx_skb
= NULL
;
383 return returning_skb
;
385 return skb_dequeue(&st_gdata
->txq
);
389 * st_int_enqueue - internal Q-ing function.
390 * Will either Q the skb to txq or the tx_waitq
391 * depending on the ST LL state.
392 * If the chip is asleep, then Q it onto waitq and
394 * txq and waitq needs protection since the other contexts
395 * may be sending data, waking up chip.
397 void st_int_enqueue(struct st_data_s
*st_gdata
, struct sk_buff
*skb
)
399 unsigned long flags
= 0;
401 pr_debug("%s", __func__
);
402 spin_lock_irqsave(&st_gdata
->lock
, flags
);
404 switch (st_ll_getstate(st_gdata
)) {
406 pr_debug("ST LL is AWAKE, sending normally");
407 skb_queue_tail(&st_gdata
->txq
, skb
);
409 case ST_LL_ASLEEP_TO_AWAKE
:
410 skb_queue_tail(&st_gdata
->tx_waitq
, skb
);
412 case ST_LL_AWAKE_TO_ASLEEP
:
413 pr_err("ST LL is illegal state(%ld),"
414 "purging received skb.", st_ll_getstate(st_gdata
));
418 skb_queue_tail(&st_gdata
->tx_waitq
, skb
);
419 st_ll_wakeup(st_gdata
);
422 pr_err("ST LL is illegal state(%ld),"
423 "purging received skb.", st_ll_getstate(st_gdata
));
428 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
429 pr_debug("done %s", __func__
);
434 * internal wakeup function
436 * - TTY layer when write's finished
437 * - st_write (in context of the protocol stack)
439 void st_tx_wakeup(struct st_data_s
*st_data
)
442 unsigned long flags
; /* for irq save flags */
443 pr_debug("%s", __func__
);
444 /* check for sending & set flag sending here */
445 if (test_and_set_bit(ST_TX_SENDING
, &st_data
->tx_state
)) {
446 pr_debug("ST already sending");
448 set_bit(ST_TX_WAKEUP
, &st_data
->tx_state
);
450 /* TX_WAKEUP will be checked in another
454 do { /* come back if st_tx_wakeup is set */
455 /* woke-up to write */
456 clear_bit(ST_TX_WAKEUP
, &st_data
->tx_state
);
457 while ((skb
= st_int_dequeue(st_data
))) {
459 spin_lock_irqsave(&st_data
->lock
, flags
);
460 /* enable wake-up from TTY */
461 set_bit(TTY_DO_WRITE_WAKEUP
, &st_data
->tty
->flags
);
462 len
= st_int_write(st_data
, skb
->data
, skb
->len
);
464 /* if skb->len = len as expected, skb->len=0 */
466 /* would be the next skb to be sent */
467 st_data
->tx_skb
= skb
;
468 spin_unlock_irqrestore(&st_data
->lock
, flags
);
472 spin_unlock_irqrestore(&st_data
->lock
, flags
);
474 /* if wake-up is set in another context- restart sending */
475 } while (test_bit(ST_TX_WAKEUP
, &st_data
->tx_state
));
477 /* clear flag sending */
478 clear_bit(ST_TX_SENDING
, &st_data
->tx_state
);
481 /********************************************************************/
482 /* functions called from ST KIM
484 void kim_st_list_protocols(struct st_data_s
*st_gdata
, void *buf
)
486 seq_printf(buf
, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n",
487 st_gdata
->protos_registered
,
488 st_gdata
->is_registered
[0x04] == true ? 'R' : 'U',
489 st_gdata
->is_registered
[0x08] == true ? 'R' : 'U',
490 st_gdata
->is_registered
[0x09] == true ? 'R' : 'U');
493 /********************************************************************/
495 * functions called from protocol stack drivers
498 long st_register(struct st_proto_s
*new_proto
)
500 struct st_data_s
*st_gdata
;
502 unsigned long flags
= 0;
504 st_kim_ref(&st_gdata
, 0);
505 pr_info("%s(%d) ", __func__
, new_proto
->chnl_id
);
506 if (st_gdata
== NULL
|| new_proto
== NULL
|| new_proto
->recv
== NULL
507 || new_proto
->reg_complete_cb
== NULL
) {
508 pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
512 if (new_proto
->chnl_id
>= ST_MAX_CHANNELS
) {
513 pr_err("chnl_id %d not supported", new_proto
->chnl_id
);
514 return -EPROTONOSUPPORT
;
517 if (st_gdata
->is_registered
[new_proto
->chnl_id
] == true) {
518 pr_err("chnl_id %d already registered", new_proto
->chnl_id
);
522 /* can be from process context only */
523 spin_lock_irqsave(&st_gdata
->lock
, flags
);
525 if (test_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
)) {
526 pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto
->chnl_id
);
527 /* fw download in progress */
529 add_channel_to_table(st_gdata
, new_proto
);
530 st_gdata
->protos_registered
++;
531 new_proto
->write
= st_write
;
533 set_bit(ST_REG_PENDING
, &st_gdata
->st_state
);
534 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
536 } else if (st_gdata
->protos_registered
== ST_EMPTY
) {
537 pr_info(" chnl_id list empty :%d ", new_proto
->chnl_id
);
538 set_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
);
539 st_recv
= st_kim_recv
;
541 /* release lock previously held - re-locked below */
542 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
544 /* enable the ST LL - to set default chip state */
545 st_ll_enable(st_gdata
);
546 /* this may take a while to complete
547 * since it involves BT fw download
549 err
= st_kim_start(st_gdata
->kim_data
);
551 clear_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
);
552 if ((st_gdata
->protos_registered
!= ST_EMPTY
) &&
553 (test_bit(ST_REG_PENDING
, &st_gdata
->st_state
))) {
554 pr_err(" KIM failure complete callback ");
555 st_reg_complete(st_gdata
, err
);
560 clear_bit(ST_REG_IN_PROGRESS
, &st_gdata
->st_state
);
561 st_recv
= st_int_recv
;
563 /* this is where all pending registration
564 * are signalled to be complete by calling callback functions
566 if ((st_gdata
->protos_registered
!= ST_EMPTY
) &&
567 (test_bit(ST_REG_PENDING
, &st_gdata
->st_state
))) {
568 pr_debug(" call reg complete callback ");
569 st_reg_complete(st_gdata
, 0);
571 clear_bit(ST_REG_PENDING
, &st_gdata
->st_state
);
573 /* check for already registered once more,
574 * since the above check is old
576 if (st_gdata
->is_registered
[new_proto
->chnl_id
] == true) {
577 pr_err(" proto %d already registered ",
582 spin_lock_irqsave(&st_gdata
->lock
, flags
);
583 add_channel_to_table(st_gdata
, new_proto
);
584 st_gdata
->protos_registered
++;
585 new_proto
->write
= st_write
;
586 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
589 /* if fw is already downloaded & new stack registers protocol */
591 add_channel_to_table(st_gdata
, new_proto
);
592 st_gdata
->protos_registered
++;
593 new_proto
->write
= st_write
;
595 /* lock already held before entering else */
596 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
599 pr_debug("done %s(%d) ", __func__
, new_proto
->chnl_id
);
601 EXPORT_SYMBOL_GPL(st_register
);
603 /* to unregister a protocol -
604 * to be called from protocol stack driver
606 long st_unregister(struct st_proto_s
*proto
)
609 unsigned long flags
= 0;
610 struct st_data_s
*st_gdata
;
612 pr_debug("%s: %d ", __func__
, proto
->chnl_id
);
614 st_kim_ref(&st_gdata
, 0);
615 if (!st_gdata
|| proto
->chnl_id
>= ST_MAX_CHANNELS
) {
616 pr_err(" chnl_id %d not supported", proto
->chnl_id
);
617 return -EPROTONOSUPPORT
;
620 spin_lock_irqsave(&st_gdata
->lock
, flags
);
622 if (st_gdata
->list
[proto
->chnl_id
] == NULL
) {
623 pr_err(" chnl_id %d not registered", proto
->chnl_id
);
624 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
625 return -EPROTONOSUPPORT
;
628 st_gdata
->protos_registered
--;
629 remove_channel_from_table(st_gdata
, proto
);
630 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
632 if ((st_gdata
->protos_registered
== ST_EMPTY
) &&
633 (!test_bit(ST_REG_PENDING
, &st_gdata
->st_state
))) {
634 pr_info(" all chnl_ids unregistered ");
636 /* stop traffic on tty */
638 tty_ldisc_flush(st_gdata
->tty
);
639 stop_tty(st_gdata
->tty
);
642 /* all chnl_ids now unregistered */
643 st_kim_stop(st_gdata
->kim_data
);
645 st_ll_disable(st_gdata
);
651 * called in protocol stack drivers
652 * via the write function pointer
654 long st_write(struct sk_buff
*skb
)
656 struct st_data_s
*st_gdata
;
659 st_kim_ref(&st_gdata
, 0);
660 if (unlikely(skb
== NULL
|| st_gdata
== NULL
661 || st_gdata
->tty
== NULL
)) {
662 pr_err("data/tty unavailable to perform write");
666 pr_debug("%d to be written", skb
->len
);
669 /* st_ll to decide where to enqueue the skb */
670 st_int_enqueue(st_gdata
, skb
);
672 st_tx_wakeup(st_gdata
);
674 /* return number of bytes written */
678 /* for protocols making use of shared transport */
679 EXPORT_SYMBOL_GPL(st_unregister
);
681 /********************************************************************/
683 * functions called from TTY layer
685 static int st_tty_open(struct tty_struct
*tty
)
688 struct st_data_s
*st_gdata
;
689 pr_info("%s ", __func__
);
691 st_kim_ref(&st_gdata
, 0);
693 tty
->disc_data
= st_gdata
;
695 /* don't do an wakeup for now */
696 clear_bit(TTY_DO_WRITE_WAKEUP
, &tty
->flags
);
698 /* mem already allocated
700 tty
->receive_room
= 65536;
701 /* Flush any pending characters in the driver and discipline. */
702 tty_ldisc_flush(tty
);
703 tty_driver_flush_buffer(tty
);
705 * signal to UIM via KIM that -
706 * installation of N_TI_WL ldisc is complete
708 st_kim_complete(st_gdata
->kim_data
);
709 pr_debug("done %s", __func__
);
713 static void st_tty_close(struct tty_struct
*tty
)
715 unsigned char i
= ST_MAX_CHANNELS
;
716 unsigned long flags
= 0;
717 struct st_data_s
*st_gdata
= tty
->disc_data
;
719 pr_info("%s ", __func__
);
722 * if a protocol has been registered & line discipline
723 * un-installed for some reason - what should be done ?
725 spin_lock_irqsave(&st_gdata
->lock
, flags
);
726 for (i
= ST_BT
; i
< ST_MAX_CHANNELS
; i
++) {
727 if (st_gdata
->is_registered
[i
] == true)
728 pr_err("%d not un-registered", i
);
729 st_gdata
->list
[i
] = NULL
;
730 st_gdata
->is_registered
[i
] = false;
732 st_gdata
->protos_registered
= 0;
733 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
735 * signal to UIM via KIM that -
736 * N_TI_WL ldisc is un-installed
738 st_kim_complete(st_gdata
->kim_data
);
739 st_gdata
->tty
= NULL
;
740 /* Flush any pending characters in the driver and discipline. */
741 tty_ldisc_flush(tty
);
742 tty_driver_flush_buffer(tty
);
744 spin_lock_irqsave(&st_gdata
->lock
, flags
);
745 /* empty out txq and tx_waitq */
746 skb_queue_purge(&st_gdata
->txq
);
747 skb_queue_purge(&st_gdata
->tx_waitq
);
748 /* reset the TTY Rx states of ST */
749 st_gdata
->rx_count
= 0;
750 st_gdata
->rx_state
= ST_W4_PACKET_TYPE
;
751 kfree_skb(st_gdata
->rx_skb
);
752 st_gdata
->rx_skb
= NULL
;
753 spin_unlock_irqrestore(&st_gdata
->lock
, flags
);
755 pr_debug("%s: done ", __func__
);
758 static void st_tty_receive(struct tty_struct
*tty
, const unsigned char *data
,
759 char *tty_flags
, int count
)
762 print_hex_dump(KERN_DEBUG
, ">in>", DUMP_PREFIX_NONE
,
763 16, 1, data
, count
, 0);
767 * if fw download is in progress then route incoming data
768 * to KIM for validation
770 st_recv(tty
->disc_data
, data
, count
);
771 pr_debug("done %s", __func__
);
774 /* wake-up function called in from the TTY layer
775 * inside the internal wakeup function will be called
777 static void st_tty_wakeup(struct tty_struct
*tty
)
779 struct st_data_s
*st_gdata
= tty
->disc_data
;
780 pr_debug("%s ", __func__
);
781 /* don't do an wakeup for now */
782 clear_bit(TTY_DO_WRITE_WAKEUP
, &tty
->flags
);
784 /* call our internal wakeup */
785 st_tx_wakeup((void *)st_gdata
);
788 static void st_tty_flush_buffer(struct tty_struct
*tty
)
790 struct st_data_s
*st_gdata
= tty
->disc_data
;
791 pr_debug("%s ", __func__
);
793 kfree_skb(st_gdata
->tx_skb
);
794 st_gdata
->tx_skb
= NULL
;
796 tty
->ops
->flush_buffer(tty
);
800 static struct tty_ldisc_ops st_ldisc_ops
= {
801 .magic
= TTY_LDISC_MAGIC
,
804 .close
= st_tty_close
,
805 .receive_buf
= st_tty_receive
,
806 .write_wakeup
= st_tty_wakeup
,
807 .flush_buffer
= st_tty_flush_buffer
,
811 /********************************************************************/
812 int st_core_init(struct st_data_s
**core_data
)
814 struct st_data_s
*st_gdata
;
817 err
= tty_register_ldisc(N_TI_WL
, &st_ldisc_ops
);
819 pr_err("error registering %d line discipline %ld",
823 pr_debug("registered n_shared line discipline");
825 st_gdata
= kzalloc(sizeof(struct st_data_s
), GFP_KERNEL
);
827 pr_err("memory allocation failed");
828 err
= tty_unregister_ldisc(N_TI_WL
);
830 pr_err("unable to un-register ldisc %ld", err
);
835 /* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's
836 * will be pushed in this queue for actual transmission.
838 skb_queue_head_init(&st_gdata
->txq
);
839 skb_queue_head_init(&st_gdata
->tx_waitq
);
841 /* Locking used in st_int_enqueue() to avoid multiple execution */
842 spin_lock_init(&st_gdata
->lock
);
844 err
= st_ll_init(st_gdata
);
846 pr_err("error during st_ll initialization(%ld)", err
);
848 err
= tty_unregister_ldisc(N_TI_WL
);
850 pr_err("unable to un-register ldisc");
853 *core_data
= st_gdata
;
857 void st_core_exit(struct st_data_s
*st_gdata
)
860 /* internal module cleanup */
861 err
= st_ll_deinit(st_gdata
);
863 pr_err("error during deinit of ST LL %ld", err
);
865 if (st_gdata
!= NULL
) {
866 /* Free ST Tx Qs and skbs */
867 skb_queue_purge(&st_gdata
->txq
);
868 skb_queue_purge(&st_gdata
->tx_waitq
);
869 kfree_skb(st_gdata
->rx_skb
);
870 kfree_skb(st_gdata
->tx_skb
);
871 /* TTY ldisc cleanup */
872 err
= tty_unregister_ldisc(N_TI_WL
);
874 pr_err("unable to un-register ldisc %ld", err
);
875 /* free the global data pointer */