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;
48 static void remove_channel_from_table(struct st_data_s *st_gdata,
49 struct st_proto_s *proto)
51 pr_info("%s: id %d\n", __func__, proto->chnl_id);
52 st_gdata->list[proto->chnl_id] = NULL;
56 * called from KIM during firmware download.
58 * This is a wrapper function to tty->ops->write_room.
59 * It returns number of free space available in
62 int st_get_uart_wr_room(struct st_data_s *st_gdata)
64 struct tty_struct *tty;
65 if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
66 pr_err("tty unavailable to perform write");
70 return tty->ops->write_room(tty);
73 /* can be called in from
74 * -- KIM (during fw download)
75 * -- ST Core (during st_write)
77 * This is the internal write function - a wrapper
80 int st_int_write(struct st_data_s *st_gdata,
81 const unsigned char *data, int count)
83 struct tty_struct *tty;
84 if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
85 pr_err("tty unavailable to perform write");
90 print_hex_dump(KERN_DEBUG, "<out<", DUMP_PREFIX_NONE,
91 16, 1, data, count, 0);
93 return tty->ops->write(tty, data, count);
98 * push the skb received to relevant
101 void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata)
103 pr_debug(" %s(prot:%d) ", __func__, chnl_id);
106 (st_gdata == NULL || st_gdata->rx_skb == NULL
107 || st_gdata->list[chnl_id] == NULL)) {
108 pr_err("chnl_id %d not registered, no data to send?",
110 kfree_skb(st_gdata->rx_skb);
114 * this shouldn't take long
115 * - should be just skb_queue_tail for the
116 * protocol stack driver
118 if (likely(st_gdata->list[chnl_id]->recv != NULL)) {
120 (st_gdata->list[chnl_id]->recv
121 (st_gdata->list[chnl_id]->priv_data, st_gdata->rx_skb)
123 pr_err(" proto stack %d's ->recv failed", chnl_id);
124 kfree_skb(st_gdata->rx_skb);
128 pr_err(" proto stack %d's ->recv null", chnl_id);
129 kfree_skb(st_gdata->rx_skb);
136 * to call registration complete callbacks
137 * of all protocol stack drivers
139 void st_reg_complete(struct st_data_s *st_gdata, char err)
142 pr_info(" %s ", __func__);
143 for (i = 0; i < ST_MAX_CHANNELS; i++) {
144 if (likely(st_gdata != NULL && st_gdata->list[i] != NULL &&
145 st_gdata->list[i]->reg_complete_cb != NULL)) {
146 st_gdata->list[i]->reg_complete_cb
147 (st_gdata->list[i]->priv_data, err);
148 pr_info("protocol %d's cb sent %d\n", i, err);
149 if (err) { /* cleanup registered protocol */
150 st_gdata->protos_registered--;
151 st_gdata->list[i] = NULL;
157 static inline int st_check_data_len(struct st_data_s *st_gdata,
158 unsigned char chnl_id, int len)
160 int room = skb_tailroom(st_gdata->rx_skb);
162 pr_debug("len %d room %d", len, room);
165 /* Received packet has only packet header and
166 * has zero length payload. So, ask ST CORE to
167 * forward the packet to protocol driver (BT/FM/GPS)
169 st_send_frame(chnl_id, st_gdata);
171 } else if (len > room) {
172 /* Received packet's payload length is larger.
173 * We can't accommodate it in created skb.
175 pr_err("Data length is too large len %d room %d", len,
177 kfree_skb(st_gdata->rx_skb);
179 /* Packet header has non-zero payload length and
180 * we have enough space in created skb. Lets read
182 st_gdata->rx_state = ST_W4_DATA;
183 st_gdata->rx_count = len;
187 /* Change ST state to continue to process next
189 st_gdata->rx_state = ST_W4_PACKET_TYPE;
190 st_gdata->rx_skb = NULL;
191 st_gdata->rx_count = 0;
192 st_gdata->rx_chnl = 0;
198 * st_wakeup_ack - internal function for action when wake-up ack
201 static inline void st_wakeup_ack(struct st_data_s *st_gdata,
204 struct sk_buff *waiting_skb;
205 unsigned long flags = 0;
207 spin_lock_irqsave(&st_gdata->lock, flags);
208 /* de-Q from waitQ and Q in txQ now that the
211 while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq)))
212 skb_queue_tail(&st_gdata->txq, waiting_skb);
214 /* state forwarded to ST LL */
215 st_ll_sleep_state(st_gdata, (unsigned long)cmd);
216 spin_unlock_irqrestore(&st_gdata->lock, flags);
218 /* wake up to send the recently copied skbs from waitQ */
219 st_tx_wakeup(st_gdata);
223 * st_int_recv - ST's internal receive function.
224 * Decodes received RAW data and forwards to corresponding
225 * client drivers (Bluetooth,FM,GPS..etc).
226 * This can receive various types of packets,
227 * HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets
228 * CH-8 packets from FM, CH-9 packets from GPS cores.
230 void st_int_recv(void *disc_data,
231 const unsigned char *data, long count)
234 struct st_proto_s *proto;
235 unsigned short payload_len = 0;
236 int len = 0, type = 0;
238 struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
242 /* tty_receive sent null ? */
243 if (unlikely(ptr == NULL) || (st_gdata == NULL)) {
244 pr_err(" received null from TTY ");
248 pr_debug("count %ld rx_state %ld"
249 "rx_count %ld", count, st_gdata->rx_state,
252 spin_lock_irqsave(&st_gdata->lock, flags);
253 /* Decode received bytes here */
255 if (st_gdata->rx_count) {
256 len = min_t(unsigned int, st_gdata->rx_count, count);
257 memcpy(skb_put(st_gdata->rx_skb, len), ptr, len);
258 st_gdata->rx_count -= len;
262 if (st_gdata->rx_count)
265 /* Check ST RX state machine , where are we? */
266 switch (st_gdata->rx_state) {
267 /* Waiting for complete packet ? */
269 pr_debug("Complete pkt received");
270 /* Ask ST CORE to forward
271 * the packet to protocol driver */
272 st_send_frame(st_gdata->rx_chnl, st_gdata);
274 st_gdata->rx_state = ST_W4_PACKET_TYPE;
275 st_gdata->rx_skb = NULL;
277 /* parse the header to know details */
279 proto = st_gdata->list[st_gdata->rx_chnl];
281 &st_gdata->rx_skb->data
282 [proto->offset_len_in_hdr];
283 pr_debug("plen pointing to %x\n", *plen);
284 if (proto->len_size == 1)/* 1 byte len field */
285 payload_len = *(unsigned char *)plen;
286 else if (proto->len_size == 2)
288 __le16_to_cpu(*(unsigned short *)plen);
290 pr_info("%s: invalid length "
292 __func__, proto->chnl_id);
293 st_check_data_len(st_gdata, proto->chnl_id,
295 pr_debug("off %d, pay len %d\n",
296 proto->offset_len_in_hdr, payload_len);
298 } /* end of switch rx_state */
301 /* end of if rx_count */
302 /* Check first byte of packet and identify module
303 * owner (BT/FM/GPS) */
308 pr_debug("PM packet");
309 /* this takes appropriate action based on
310 * sleep state received --
312 st_ll_sleep_state(st_gdata, *ptr);
313 /* if WAKEUP_IND collides copy from waitq to txq
314 * and assume chip awake
316 spin_unlock_irqrestore(&st_gdata->lock, flags);
317 if (st_ll_getstate(st_gdata) == ST_LL_AWAKE)
318 st_wakeup_ack(st_gdata, LL_WAKE_UP_ACK);
319 spin_lock_irqsave(&st_gdata->lock, flags);
325 pr_debug("PM packet");
327 spin_unlock_irqrestore(&st_gdata->lock, flags);
328 /* wake up ack received */
329 st_wakeup_ack(st_gdata, *ptr);
330 spin_lock_irqsave(&st_gdata->lock, flags);
338 st_gdata->rx_skb = alloc_skb(
339 st_gdata->list[type]->max_frame_size,
341 skb_reserve(st_gdata->rx_skb,
342 st_gdata->list[type]->reserve);
343 /* next 2 required for BT only */
344 st_gdata->rx_skb->cb[0] = type; /*pkt_type*/
345 st_gdata->rx_skb->cb[1] = 0; /*incoming*/
346 st_gdata->rx_chnl = *ptr;
347 st_gdata->rx_state = ST_W4_HEADER;
348 st_gdata->rx_count = st_gdata->list[type]->hdr_len;
349 pr_debug("rx_count %ld\n", st_gdata->rx_count);
354 spin_unlock_irqrestore(&st_gdata->lock, flags);
355 pr_debug("done %s", __func__);
360 * st_int_dequeue - internal de-Q function.
361 * If the previous data set was not written
362 * completely, return that skb which has the pending data.
363 * In normal cases, return top of txq.
365 struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata)
367 struct sk_buff *returning_skb;
369 pr_debug("%s", __func__);
370 if (st_gdata->tx_skb != NULL) {
371 returning_skb = st_gdata->tx_skb;
372 st_gdata->tx_skb = NULL;
373 return returning_skb;
375 return skb_dequeue(&st_gdata->txq);
379 * st_int_enqueue - internal Q-ing function.
380 * Will either Q the skb to txq or the tx_waitq
381 * depending on the ST LL state.
382 * If the chip is asleep, then Q it onto waitq and
384 * txq and waitq needs protection since the other contexts
385 * may be sending data, waking up chip.
387 void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb)
389 unsigned long flags = 0;
391 pr_debug("%s", __func__);
392 spin_lock_irqsave(&st_gdata->lock, flags);
394 switch (st_ll_getstate(st_gdata)) {
396 pr_debug("ST LL is AWAKE, sending normally");
397 skb_queue_tail(&st_gdata->txq, skb);
399 case ST_LL_ASLEEP_TO_AWAKE:
400 skb_queue_tail(&st_gdata->tx_waitq, skb);
402 case ST_LL_AWAKE_TO_ASLEEP:
403 pr_err("ST LL is illegal state(%ld),"
404 "purging received skb.", st_ll_getstate(st_gdata));
408 skb_queue_tail(&st_gdata->tx_waitq, skb);
409 st_ll_wakeup(st_gdata);
412 pr_err("ST LL is illegal state(%ld),"
413 "purging received skb.", st_ll_getstate(st_gdata));
418 spin_unlock_irqrestore(&st_gdata->lock, flags);
419 pr_debug("done %s", __func__);
424 * internal wakeup function
426 * - TTY layer when write's finished
427 * - st_write (in context of the protocol stack)
429 void st_tx_wakeup(struct st_data_s *st_data)
432 unsigned long flags; /* for irq save flags */
433 pr_debug("%s", __func__);
434 /* check for sending & set flag sending here */
435 if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) {
436 pr_debug("ST already sending");
438 set_bit(ST_TX_WAKEUP, &st_data->tx_state);
440 /* TX_WAKEUP will be checked in another
444 do { /* come back if st_tx_wakeup is set */
445 /* woke-up to write */
446 clear_bit(ST_TX_WAKEUP, &st_data->tx_state);
447 while ((skb = st_int_dequeue(st_data))) {
449 spin_lock_irqsave(&st_data->lock, flags);
450 /* enable wake-up from TTY */
451 set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags);
452 len = st_int_write(st_data, skb->data, skb->len);
454 /* if skb->len = len as expected, skb->len=0 */
456 /* would be the next skb to be sent */
457 st_data->tx_skb = skb;
458 spin_unlock_irqrestore(&st_data->lock, flags);
462 spin_unlock_irqrestore(&st_data->lock, flags);
464 /* if wake-up is set in another context- restart sending */
465 } while (test_bit(ST_TX_WAKEUP, &st_data->tx_state));
467 /* clear flag sending */
468 clear_bit(ST_TX_SENDING, &st_data->tx_state);
471 /********************************************************************/
472 /* functions called from ST KIM
474 void kim_st_list_protocols(struct st_data_s *st_gdata, void *buf)
476 seq_printf(buf, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n",
477 st_gdata->protos_registered,
478 st_gdata->list[0x04] != NULL ? 'R' : 'U',
479 st_gdata->list[0x08] != NULL ? 'R' : 'U',
480 st_gdata->list[0x09] != NULL ? 'R' : 'U');
483 /********************************************************************/
485 * functions called from protocol stack drivers
488 long st_register(struct st_proto_s *new_proto)
490 struct st_data_s *st_gdata;
492 unsigned long flags = 0;
494 st_kim_ref(&st_gdata, 0);
495 pr_info("%s(%d) ", __func__, new_proto->chnl_id);
496 if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL
497 || new_proto->reg_complete_cb == NULL) {
498 pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
502 if (new_proto->chnl_id >= ST_MAX_CHANNELS) {
503 pr_err("chnl_id %d not supported", new_proto->chnl_id);
504 return -EPROTONOSUPPORT;
507 if (st_gdata->list[new_proto->chnl_id] != NULL) {
508 pr_err("chnl_id %d already registered", new_proto->chnl_id);
512 /* can be from process context only */
513 spin_lock_irqsave(&st_gdata->lock, flags);
515 if (test_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state)) {
516 pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto->chnl_id);
517 /* fw download in progress */
519 add_channel_to_table(st_gdata, new_proto);
520 st_gdata->protos_registered++;
521 new_proto->write = st_write;
523 set_bit(ST_REG_PENDING, &st_gdata->st_state);
524 spin_unlock_irqrestore(&st_gdata->lock, flags);
526 } else if (st_gdata->protos_registered == ST_EMPTY) {
527 pr_info(" chnl_id list empty :%d ", new_proto->chnl_id);
528 set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
529 st_recv = st_kim_recv;
531 /* release lock previously held - re-locked below */
532 spin_unlock_irqrestore(&st_gdata->lock, flags);
534 /* enable the ST LL - to set default chip state */
535 st_ll_enable(st_gdata);
536 /* this may take a while to complete
537 * since it involves BT fw download
539 err = st_kim_start(st_gdata->kim_data);
541 clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
542 if ((st_gdata->protos_registered != ST_EMPTY) &&
543 (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
544 pr_err(" KIM failure complete callback ");
545 st_reg_complete(st_gdata, err);
550 clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
551 st_recv = st_int_recv;
553 /* this is where all pending registration
554 * are signalled to be complete by calling callback functions
556 if ((st_gdata->protos_registered != ST_EMPTY) &&
557 (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
558 pr_debug(" call reg complete callback ");
559 st_reg_complete(st_gdata, 0);
561 clear_bit(ST_REG_PENDING, &st_gdata->st_state);
563 /* check for already registered once more,
564 * since the above check is old
566 if (st_gdata->list[new_proto->chnl_id] != NULL) {
567 pr_err(" proto %d already registered ",
572 spin_lock_irqsave(&st_gdata->lock, flags);
573 add_channel_to_table(st_gdata, new_proto);
574 st_gdata->protos_registered++;
575 new_proto->write = st_write;
576 spin_unlock_irqrestore(&st_gdata->lock, flags);
579 /* if fw is already downloaded & new stack registers protocol */
581 add_channel_to_table(st_gdata, new_proto);
582 st_gdata->protos_registered++;
583 new_proto->write = st_write;
585 /* lock already held before entering else */
586 spin_unlock_irqrestore(&st_gdata->lock, flags);
589 pr_debug("done %s(%d) ", __func__, new_proto->chnl_id);
591 EXPORT_SYMBOL_GPL(st_register);
593 /* to unregister a protocol -
594 * to be called from protocol stack driver
596 long st_unregister(struct st_proto_s *proto)
599 unsigned long flags = 0;
600 struct st_data_s *st_gdata;
602 pr_debug("%s: %d ", __func__, proto->chnl_id);
604 st_kim_ref(&st_gdata, 0);
605 if (proto->chnl_id >= ST_MAX_CHANNELS) {
606 pr_err(" chnl_id %d not supported", proto->chnl_id);
607 return -EPROTONOSUPPORT;
610 spin_lock_irqsave(&st_gdata->lock, flags);
612 if (st_gdata->list[proto->chnl_id] == NULL) {
613 pr_err(" chnl_id %d not registered", proto->chnl_id);
614 spin_unlock_irqrestore(&st_gdata->lock, flags);
615 return -EPROTONOSUPPORT;
618 st_gdata->protos_registered--;
619 remove_channel_from_table(st_gdata, proto);
620 spin_unlock_irqrestore(&st_gdata->lock, flags);
622 if ((st_gdata->protos_registered == ST_EMPTY) &&
623 (!test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
624 pr_info(" all chnl_ids unregistered ");
626 /* stop traffic on tty */
628 tty_ldisc_flush(st_gdata->tty);
629 stop_tty(st_gdata->tty);
632 /* all chnl_ids now unregistered */
633 st_kim_stop(st_gdata->kim_data);
635 st_ll_disable(st_gdata);
641 * called in protocol stack drivers
642 * via the write function pointer
644 long st_write(struct sk_buff *skb)
646 struct st_data_s *st_gdata;
649 st_kim_ref(&st_gdata, 0);
650 if (unlikely(skb == NULL || st_gdata == NULL
651 || st_gdata->tty == NULL)) {
652 pr_err("data/tty unavailable to perform write");
656 pr_debug("%d to be written", skb->len);
659 /* st_ll to decide where to enqueue the skb */
660 st_int_enqueue(st_gdata, skb);
662 st_tx_wakeup(st_gdata);
664 /* return number of bytes written */
668 /* for protocols making use of shared transport */
669 EXPORT_SYMBOL_GPL(st_unregister);
671 /********************************************************************/
673 * functions called from TTY layer
675 static int st_tty_open(struct tty_struct *tty)
678 struct st_data_s *st_gdata;
679 pr_info("%s ", __func__);
681 st_kim_ref(&st_gdata, 0);
683 tty->disc_data = st_gdata;
685 /* don't do an wakeup for now */
686 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
688 /* mem already allocated
690 tty->receive_room = 65536;
691 /* Flush any pending characters in the driver and discipline. */
692 tty_ldisc_flush(tty);
693 tty_driver_flush_buffer(tty);
695 * signal to UIM via KIM that -
696 * installation of N_TI_WL ldisc is complete
698 st_kim_complete(st_gdata->kim_data);
699 pr_debug("done %s", __func__);
703 static void st_tty_close(struct tty_struct *tty)
705 unsigned char i = ST_MAX_CHANNELS;
706 unsigned long flags = 0;
707 struct st_data_s *st_gdata = tty->disc_data;
709 pr_info("%s ", __func__);
712 * if a protocol has been registered & line discipline
713 * un-installed for some reason - what should be done ?
715 spin_lock_irqsave(&st_gdata->lock, flags);
716 for (i = ST_BT; i < ST_MAX_CHANNELS; i++) {
717 if (st_gdata->list[i] != NULL)
718 pr_err("%d not un-registered", i);
719 st_gdata->list[i] = NULL;
721 st_gdata->protos_registered = 0;
722 spin_unlock_irqrestore(&st_gdata->lock, flags);
724 * signal to UIM via KIM that -
725 * N_TI_WL ldisc is un-installed
727 st_kim_complete(st_gdata->kim_data);
728 st_gdata->tty = NULL;
729 /* Flush any pending characters in the driver and discipline. */
730 tty_ldisc_flush(tty);
731 tty_driver_flush_buffer(tty);
733 spin_lock_irqsave(&st_gdata->lock, flags);
734 /* empty out txq and tx_waitq */
735 skb_queue_purge(&st_gdata->txq);
736 skb_queue_purge(&st_gdata->tx_waitq);
737 /* reset the TTY Rx states of ST */
738 st_gdata->rx_count = 0;
739 st_gdata->rx_state = ST_W4_PACKET_TYPE;
740 kfree_skb(st_gdata->rx_skb);
741 st_gdata->rx_skb = NULL;
742 spin_unlock_irqrestore(&st_gdata->lock, flags);
744 pr_debug("%s: done ", __func__);
747 static void st_tty_receive(struct tty_struct *tty, const unsigned char *data,
748 char *tty_flags, int count)
751 print_hex_dump(KERN_DEBUG, ">in>", DUMP_PREFIX_NONE,
752 16, 1, data, count, 0);
756 * if fw download is in progress then route incoming data
757 * to KIM for validation
759 st_recv(tty->disc_data, data, count);
760 pr_debug("done %s", __func__);
763 /* wake-up function called in from the TTY layer
764 * inside the internal wakeup function will be called
766 static void st_tty_wakeup(struct tty_struct *tty)
768 struct st_data_s *st_gdata = tty->disc_data;
769 pr_debug("%s ", __func__);
770 /* don't do an wakeup for now */
771 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
773 /* call our internal wakeup */
774 st_tx_wakeup((void *)st_gdata);
777 static void st_tty_flush_buffer(struct tty_struct *tty)
779 struct st_data_s *st_gdata = tty->disc_data;
780 pr_debug("%s ", __func__);
782 kfree_skb(st_gdata->tx_skb);
783 st_gdata->tx_skb = NULL;
785 tty->ops->flush_buffer(tty);
789 static struct tty_ldisc_ops st_ldisc_ops = {
790 .magic = TTY_LDISC_MAGIC,
793 .close = st_tty_close,
794 .receive_buf = st_tty_receive,
795 .write_wakeup = st_tty_wakeup,
796 .flush_buffer = st_tty_flush_buffer,
800 /********************************************************************/
801 int st_core_init(struct st_data_s **core_data)
803 struct st_data_s *st_gdata;
806 err = tty_register_ldisc(N_TI_WL, &st_ldisc_ops);
808 pr_err("error registering %d line discipline %ld",
812 pr_debug("registered n_shared line discipline");
814 st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL);
816 pr_err("memory allocation failed");
817 err = tty_unregister_ldisc(N_TI_WL);
819 pr_err("unable to un-register ldisc %ld", err);
824 /* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's
825 * will be pushed in this queue for actual transmission.
827 skb_queue_head_init(&st_gdata->txq);
828 skb_queue_head_init(&st_gdata->tx_waitq);
830 /* Locking used in st_int_enqueue() to avoid multiple execution */
831 spin_lock_init(&st_gdata->lock);
833 err = st_ll_init(st_gdata);
835 pr_err("error during st_ll initialization(%ld)", err);
837 err = tty_unregister_ldisc(N_TI_WL);
839 pr_err("unable to un-register ldisc");
842 *core_data = st_gdata;
846 void st_core_exit(struct st_data_s *st_gdata)
849 /* internal module cleanup */
850 err = st_ll_deinit(st_gdata);
852 pr_err("error during deinit of ST LL %ld", err);
854 if (st_gdata != NULL) {
855 /* Free ST Tx Qs and skbs */
856 skb_queue_purge(&st_gdata->txq);
857 skb_queue_purge(&st_gdata->tx_waitq);
858 kfree_skb(st_gdata->rx_skb);
859 kfree_skb(st_gdata->tx_skb);
860 /* TTY ldisc cleanup */
861 err = tty_unregister_ldisc(N_TI_WL);
863 pr_err("unable to un-register ldisc %ld", err);
864 /* free the global data pointer */