2 * Shared Transport Line discipline driver Core
3 * This hooks up ST KIM driver and ST LL driver
4 * Copyright (C) 2009 Texas Instruments
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #define pr_fmt(fmt) "(stc): " fmt
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/tty.h>
27 /* understand BT, FM and GPS for now */
28 #include <net/bluetooth/bluetooth.h>
29 #include <net/bluetooth/hci_core.h>
30 #include <net/bluetooth/hci.h>
33 * packet formats for fm and gps
42 /* strings to be used for rfkill entries and by
43 * ST Core to be used for sysfs debug entry
45 #define PROTO_ENTRY(type, name) name
46 const unsigned char *protocol_strngs[] = {
47 PROTO_ENTRY(ST_BT, "Bluetooth"),
48 PROTO_ENTRY(ST_FM, "FM"),
49 PROTO_ENTRY(ST_GPS, "GPS"),
51 /* function pointer pointing to either,
52 * st_kim_recv during registration to receive fw download responses
53 * st_int_recv after registration to receive proto stack responses
55 void (*st_recv) (void*, const unsigned char*, long);
57 /********************************************************************/
59 /* internal misc functions */
60 bool is_protocol_list_empty(void)
63 pr_debug(" %s ", __func__);
64 for (i = 0; i < ST_MAX; i++) {
65 if (st_gdata->list[i] != NULL)
74 /* can be called in from
75 * -- KIM (during fw download)
76 * -- ST Core (during st_write)
78 * This is the internal write function - a wrapper
81 int st_int_write(struct st_data_s *st_gdata,
82 const unsigned char *data, int count)
84 struct tty_struct *tty;
85 if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
86 pr_err("tty unavailable to perform write");
91 print_hex_dump(KERN_DEBUG, "<out<", DUMP_PREFIX_NONE,
92 16, 1, data, count, 0);
94 return tty->ops->write(tty, data, count);
99 * push the skb received to relevant
102 void st_send_frame(enum proto_type protoid, struct st_data_s *st_gdata)
104 pr_info(" %s(prot:%d) ", __func__, protoid);
107 (st_gdata == NULL || st_gdata->rx_skb == NULL
108 || st_gdata->list[protoid] == NULL)) {
109 pr_err("protocol %d not registered, no data to send?",
111 kfree_skb(st_gdata->rx_skb);
115 * this shouldn't take long
116 * - should be just skb_queue_tail for the
117 * protocol stack driver
119 if (likely(st_gdata->list[protoid]->recv != NULL)) {
121 (st_gdata->list[protoid]->recv
122 (st_gdata->list[protoid]->priv_data, st_gdata->rx_skb)
124 pr_err(" proto stack %d's ->recv failed", protoid);
125 kfree_skb(st_gdata->rx_skb);
129 pr_err(" proto stack %d's ->recv null", protoid);
130 kfree_skb(st_gdata->rx_skb);
137 * to call registration complete callbacks
138 * of all protocol stack drivers
140 void st_reg_complete(struct st_data_s *st_gdata, char err)
143 pr_info(" %s ", __func__);
144 for (i = 0; i < ST_MAX; i++) {
145 if (likely(st_gdata != NULL && st_gdata->list[i] != NULL &&
146 st_gdata->list[i]->reg_complete_cb != NULL))
147 st_gdata->list[i]->reg_complete_cb
148 (st_gdata->list[i]->priv_data, err);
152 static inline int st_check_data_len(struct st_data_s *st_gdata,
153 int protoid, int len)
155 register int room = skb_tailroom(st_gdata->rx_skb);
157 pr_debug("len %d room %d", len, room);
160 /* Received packet has only packet header and
161 * has zero length payload. So, ask ST CORE to
162 * forward the packet to protocol driver (BT/FM/GPS)
164 st_send_frame(protoid, st_gdata);
166 } else if (len > room) {
167 /* Received packet's payload length is larger.
168 * We can't accommodate it in created skb.
170 pr_err("Data length is too large len %d room %d", len,
172 kfree_skb(st_gdata->rx_skb);
174 /* Packet header has non-zero payload length and
175 * we have enough space in created skb. Lets read
177 st_gdata->rx_state = ST_BT_W4_DATA;
178 st_gdata->rx_count = len;
182 /* Change ST state to continue to process next
184 st_gdata->rx_state = ST_W4_PACKET_TYPE;
185 st_gdata->rx_skb = NULL;
186 st_gdata->rx_count = 0;
192 * st_wakeup_ack - internal function for action when wake-up ack
195 static inline void st_wakeup_ack(struct st_data_s *st_gdata,
198 register struct sk_buff *waiting_skb;
199 unsigned long flags = 0;
201 spin_lock_irqsave(&st_gdata->lock, flags);
202 /* de-Q from waitQ and Q in txQ now that the
205 while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq)))
206 skb_queue_tail(&st_gdata->txq, waiting_skb);
208 /* state forwarded to ST LL */
209 st_ll_sleep_state(st_gdata, (unsigned long)cmd);
210 spin_unlock_irqrestore(&st_gdata->lock, flags);
212 /* wake up to send the recently copied skbs from waitQ */
213 st_tx_wakeup(st_gdata);
217 * st_int_recv - ST's internal receive function.
218 * Decodes received RAW data and forwards to corresponding
219 * client drivers (Bluetooth,FM,GPS..etc).
220 * This can receive various types of packets,
221 * HCI-Events, ACL, SCO, 4 types of HCI-LL PM packets
222 * CH-8 packets from FM, CH-9 packets from GPS cores.
224 void st_int_recv(void *disc_data,
225 const unsigned char *data, long count)
228 struct hci_event_hdr *eh;
229 struct hci_acl_hdr *ah;
230 struct hci_sco_hdr *sh;
231 struct fm_event_hdr *fm;
232 struct gps_event_hdr *gps;
233 register int len = 0, type = 0, dlen = 0;
234 static enum proto_type protoid = ST_MAX;
235 struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
238 /* tty_receive sent null ? */
239 if (unlikely(ptr == NULL) || (st_gdata == NULL)) {
240 pr_err(" received null from TTY ");
244 pr_info("count %ld rx_state %ld"
245 "rx_count %ld", count, st_gdata->rx_state,
248 /* Decode received bytes here */
250 if (st_gdata->rx_count) {
251 len = min_t(unsigned int, st_gdata->rx_count, count);
252 memcpy(skb_put(st_gdata->rx_skb, len), ptr, len);
253 st_gdata->rx_count -= len;
257 if (st_gdata->rx_count)
260 /* Check ST RX state machine , where are we? */
261 switch (st_gdata->rx_state) {
263 /* Waiting for complete packet ? */
265 pr_debug("Complete pkt received");
267 /* Ask ST CORE to forward
268 * the packet to protocol driver */
269 st_send_frame(protoid, st_gdata);
271 st_gdata->rx_state = ST_W4_PACKET_TYPE;
272 st_gdata->rx_skb = NULL;
273 protoid = ST_MAX; /* is this required ? */
276 /* Waiting for Bluetooth event header ? */
277 case ST_BT_W4_EVENT_HDR:
278 eh = (struct hci_event_hdr *)st_gdata->rx_skb->
281 pr_debug("Event header: evt 0x%2.2x"
282 "plen %d", eh->evt, eh->plen);
284 st_check_data_len(st_gdata, protoid, eh->plen);
287 /* Waiting for Bluetooth acl header ? */
288 case ST_BT_W4_ACL_HDR:
289 ah = (struct hci_acl_hdr *)st_gdata->rx_skb->
291 dlen = __le16_to_cpu(ah->dlen);
293 pr_info("ACL header: dlen %d", dlen);
295 st_check_data_len(st_gdata, protoid, dlen);
298 /* Waiting for Bluetooth sco header ? */
299 case ST_BT_W4_SCO_HDR:
300 sh = (struct hci_sco_hdr *)st_gdata->rx_skb->
303 pr_info("SCO header: dlen %d", sh->dlen);
305 st_check_data_len(st_gdata, protoid, sh->dlen);
307 case ST_FM_W4_EVENT_HDR:
308 fm = (struct fm_event_hdr *)st_gdata->rx_skb->
310 pr_info("FM Header: ");
311 st_check_data_len(st_gdata, ST_FM, fm->plen);
313 /* TODO : Add GPS packet machine logic here */
314 case ST_GPS_W4_EVENT_HDR:
315 /* [0x09 pkt hdr][R/W byte][2 byte len] */
316 gps = (struct gps_event_hdr *)st_gdata->rx_skb->
318 pr_info("GPS Header: ");
319 st_check_data_len(st_gdata, ST_GPS, gps->plen);
321 } /* end of switch rx_state */
324 /* end of if rx_count */
325 /* Check first byte of packet and identify module
326 * owner (BT/FM/GPS) */
329 /* Bluetooth event packet? */
331 pr_info("Event packet");
332 st_gdata->rx_state = ST_BT_W4_EVENT_HDR;
333 st_gdata->rx_count = HCI_EVENT_HDR_SIZE;
334 type = HCI_EVENT_PKT;
338 /* Bluetooth acl packet? */
339 case HCI_ACLDATA_PKT:
340 pr_info("ACL packet");
341 st_gdata->rx_state = ST_BT_W4_ACL_HDR;
342 st_gdata->rx_count = HCI_ACL_HDR_SIZE;
343 type = HCI_ACLDATA_PKT;
347 /* Bluetooth sco packet? */
348 case HCI_SCODATA_PKT:
349 pr_info("SCO packet");
350 st_gdata->rx_state = ST_BT_W4_SCO_HDR;
351 st_gdata->rx_count = HCI_SCO_HDR_SIZE;
352 type = HCI_SCODATA_PKT;
356 /* Channel 8(FM) packet? */
358 pr_info("FM CH8 packet");
359 type = ST_FM_CH8_PKT;
360 st_gdata->rx_state = ST_FM_W4_EVENT_HDR;
361 st_gdata->rx_count = FM_EVENT_HDR_SIZE;
365 /* Channel 9(GPS) packet? */
366 case 0x9: /*ST_LL_GPS_CH9_PKT */
367 pr_info("GPS CH9 packet");
368 type = 0x9; /* ST_LL_GPS_CH9_PKT; */
370 st_gdata->rx_state = ST_GPS_W4_EVENT_HDR;
371 st_gdata->rx_count = 3; /* GPS_EVENT_HDR_SIZE -1*/
376 pr_info("PM packet");
377 /* this takes appropriate action based on
378 * sleep state received --
380 st_ll_sleep_state(st_gdata, *ptr);
385 pr_info("PM packet");
386 /* wake up ack received */
387 st_wakeup_ack(st_gdata, *ptr);
393 pr_err("Unknown packet type %2.2x", (__u8) *ptr);
403 /* Allocate new packet to hold received data */
405 bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
406 if (!st_gdata->rx_skb) {
407 pr_err("Can't allocate mem for new packet");
408 st_gdata->rx_state = ST_W4_PACKET_TYPE;
409 st_gdata->rx_count = 0;
412 bt_cb(st_gdata->rx_skb)->pkt_type = type;
414 case ST_FM: /* for FM */
416 alloc_skb(FM_MAX_FRAME_SIZE, GFP_ATOMIC);
417 if (!st_gdata->rx_skb) {
418 pr_err("Can't allocate mem for new packet");
419 st_gdata->rx_state = ST_W4_PACKET_TYPE;
420 st_gdata->rx_count = 0;
423 /* place holder 0x08 */
424 skb_reserve(st_gdata->rx_skb, 1);
425 st_gdata->rx_skb->cb[0] = ST_FM_CH8_PKT;
430 alloc_skb(100 /*GPS_MAX_FRAME_SIZE */ , GFP_ATOMIC);
431 if (!st_gdata->rx_skb) {
432 pr_err("Can't allocate mem for new packet");
433 st_gdata->rx_state = ST_W4_PACKET_TYPE;
434 st_gdata->rx_count = 0;
437 /* place holder 0x09 */
438 skb_reserve(st_gdata->rx_skb, 1);
439 st_gdata->rx_skb->cb[0] = 0x09; /*ST_GPS_CH9_PKT; */
445 pr_debug("done %s", __func__);
450 * st_int_dequeue - internal de-Q function.
451 * If the previous data set was not written
452 * completely, return that skb which has the pending data.
453 * In normal cases, return top of txq.
455 struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata)
457 struct sk_buff *returning_skb;
459 pr_debug("%s", __func__);
460 if (st_gdata->tx_skb != NULL) {
461 returning_skb = st_gdata->tx_skb;
462 st_gdata->tx_skb = NULL;
463 return returning_skb;
465 return skb_dequeue(&st_gdata->txq);
469 * st_int_enqueue - internal Q-ing function.
470 * Will either Q the skb to txq or the tx_waitq
471 * depending on the ST LL state.
472 * If the chip is asleep, then Q it onto waitq and
474 * txq and waitq needs protection since the other contexts
475 * may be sending data, waking up chip.
477 void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb)
479 unsigned long flags = 0;
481 pr_debug("%s", __func__);
482 spin_lock_irqsave(&st_gdata->lock, flags);
484 switch (st_ll_getstate(st_gdata)) {
486 pr_info("ST LL is AWAKE, sending normally");
487 skb_queue_tail(&st_gdata->txq, skb);
489 case ST_LL_ASLEEP_TO_AWAKE:
490 skb_queue_tail(&st_gdata->tx_waitq, skb);
492 case ST_LL_AWAKE_TO_ASLEEP:
493 pr_err("ST LL is illegal state(%ld),"
494 "purging received skb.", st_ll_getstate(st_gdata));
498 skb_queue_tail(&st_gdata->tx_waitq, skb);
499 st_ll_wakeup(st_gdata);
502 pr_err("ST LL is illegal state(%ld),"
503 "purging received skb.", st_ll_getstate(st_gdata));
508 spin_unlock_irqrestore(&st_gdata->lock, flags);
509 pr_debug("done %s", __func__);
514 * internal wakeup function
516 * - TTY layer when write's finished
517 * - st_write (in context of the protocol stack)
519 void st_tx_wakeup(struct st_data_s *st_data)
522 unsigned long flags; /* for irq save flags */
523 pr_debug("%s", __func__);
524 /* check for sending & set flag sending here */
525 if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) {
526 pr_info("ST already sending");
528 set_bit(ST_TX_WAKEUP, &st_data->tx_state);
530 /* TX_WAKEUP will be checked in another
534 do { /* come back if st_tx_wakeup is set */
535 /* woke-up to write */
536 clear_bit(ST_TX_WAKEUP, &st_data->tx_state);
537 while ((skb = st_int_dequeue(st_data))) {
539 spin_lock_irqsave(&st_data->lock, flags);
540 /* enable wake-up from TTY */
541 set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags);
542 len = st_int_write(st_data, skb->data, skb->len);
544 /* if skb->len = len as expected, skb->len=0 */
546 /* would be the next skb to be sent */
547 st_data->tx_skb = skb;
548 spin_unlock_irqrestore(&st_data->lock, flags);
552 spin_unlock_irqrestore(&st_data->lock, flags);
554 /* if wake-up is set in another context- restart sending */
555 } while (test_bit(ST_TX_WAKEUP, &st_data->tx_state));
557 /* clear flag sending */
558 clear_bit(ST_TX_SENDING, &st_data->tx_state);
561 /********************************************************************/
562 /* functions called from ST KIM
564 void kim_st_list_protocols(struct st_data_s *st_gdata, void *buf)
566 seq_printf(buf, "[%d]\nBT=%c\nFM=%c\nGPS=%c\n",
567 st_gdata->protos_registered,
568 st_gdata->list[ST_BT] != NULL ? 'R' : 'U',
569 st_gdata->list[ST_FM] != NULL ? 'R' : 'U',
570 st_gdata->list[ST_GPS] != NULL ? 'R' : 'U');
573 /********************************************************************/
575 * functions called from protocol stack drivers
578 long st_register(struct st_proto_s *new_proto)
580 struct st_data_s *st_gdata;
582 unsigned long flags = 0;
584 st_kim_ref(&st_gdata);
585 pr_info("%s(%d) ", __func__, new_proto->type);
586 if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL
587 || new_proto->reg_complete_cb == NULL) {
588 pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
592 if (new_proto->type < ST_BT || new_proto->type >= ST_MAX) {
593 pr_err("protocol %d not supported", new_proto->type);
594 return -EPROTONOSUPPORT;
597 if (st_gdata->list[new_proto->type] != NULL) {
598 pr_err("protocol %d already registered", new_proto->type);
602 /* can be from process context only */
603 spin_lock_irqsave(&st_gdata->lock, flags);
605 if (test_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state)) {
606 pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto->type);
607 /* fw download in progress */
608 st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
610 st_gdata->list[new_proto->type] = new_proto;
611 st_gdata->protos_registered++;
612 new_proto->write = st_write;
614 set_bit(ST_REG_PENDING, &st_gdata->st_state);
615 spin_unlock_irqrestore(&st_gdata->lock, flags);
617 } else if (st_gdata->protos_registered == ST_EMPTY) {
618 pr_info(" protocol list empty :%d ", new_proto->type);
619 set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
620 st_recv = st_kim_recv;
622 /* release lock previously held - re-locked below */
623 spin_unlock_irqrestore(&st_gdata->lock, flags);
625 /* enable the ST LL - to set default chip state */
626 st_ll_enable(st_gdata);
627 /* this may take a while to complete
628 * since it involves BT fw download
630 err = st_kim_start(st_gdata->kim_data);
632 clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
633 if ((st_gdata->protos_registered != ST_EMPTY) &&
634 (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
635 pr_err(" KIM failure complete callback ");
636 st_reg_complete(st_gdata, -1);
642 /* the protocol might require other gpios to be toggled
644 st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
646 clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
647 st_recv = st_int_recv;
649 /* this is where all pending registration
650 * are signalled to be complete by calling callback functions
652 if ((st_gdata->protos_registered != ST_EMPTY) &&
653 (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
654 pr_debug(" call reg complete callback ");
655 st_reg_complete(st_gdata, 0);
657 clear_bit(ST_REG_PENDING, &st_gdata->st_state);
659 /* check for already registered once more,
660 * since the above check is old
662 if (st_gdata->list[new_proto->type] != NULL) {
663 pr_err(" proto %d already registered ",
668 spin_lock_irqsave(&st_gdata->lock, flags);
669 st_gdata->list[new_proto->type] = new_proto;
670 st_gdata->protos_registered++;
671 new_proto->write = st_write;
672 spin_unlock_irqrestore(&st_gdata->lock, flags);
675 /* if fw is already downloaded & new stack registers protocol */
677 switch (new_proto->type) {
683 st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
687 pr_err("%d protocol not supported",
689 err = -EPROTONOSUPPORT;
690 /* something wrong */
693 st_gdata->list[new_proto->type] = new_proto;
694 st_gdata->protos_registered++;
695 new_proto->write = st_write;
697 /* lock already held before entering else */
698 spin_unlock_irqrestore(&st_gdata->lock, flags);
701 pr_debug("done %s(%d) ", __func__, new_proto->type);
703 EXPORT_SYMBOL_GPL(st_register);
705 /* to unregister a protocol -
706 * to be called from protocol stack driver
708 long st_unregister(enum proto_type type)
711 unsigned long flags = 0;
712 struct st_data_s *st_gdata;
714 pr_debug("%s: %d ", __func__, type);
716 st_kim_ref(&st_gdata);
717 if (type < ST_BT || type >= ST_MAX) {
718 pr_err(" protocol %d not supported", type);
719 return -EPROTONOSUPPORT;
722 spin_lock_irqsave(&st_gdata->lock, flags);
724 if (st_gdata->list[type] == NULL) {
725 pr_err(" protocol %d not registered", type);
726 spin_unlock_irqrestore(&st_gdata->lock, flags);
727 return -EPROTONOSUPPORT;
730 st_gdata->protos_registered--;
731 st_gdata->list[type] = NULL;
733 /* kim ignores BT in the below function
734 * and handles the rest, BT is toggled
735 * only in kim_start and kim_stop
737 st_kim_chip_toggle(type, KIM_GPIO_INACTIVE);
738 spin_unlock_irqrestore(&st_gdata->lock, flags);
740 if ((st_gdata->protos_registered == ST_EMPTY) &&
741 (!test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
742 pr_info(" all protocols unregistered ");
744 /* stop traffic on tty */
746 tty_ldisc_flush(st_gdata->tty);
747 stop_tty(st_gdata->tty);
750 /* all protocols now unregistered */
751 st_kim_stop(st_gdata->kim_data);
753 st_ll_disable(st_gdata);
759 * called in protocol stack drivers
760 * via the write function pointer
762 long st_write(struct sk_buff *skb)
764 struct st_data_s *st_gdata;
766 enum proto_type protoid = ST_MAX;
770 st_kim_ref(&st_gdata);
771 if (unlikely(skb == NULL || st_gdata == NULL
772 || st_gdata->tty == NULL)) {
773 pr_err("data/tty unavailable to perform write");
776 #ifdef DEBUG /* open-up skb to read the 1st byte */
777 switch (skb->data[0]) {
778 case HCI_COMMAND_PKT:
779 case HCI_ACLDATA_PKT:
780 case HCI_SCODATA_PKT:
790 if (unlikely(st_gdata->list[protoid] == NULL)) {
791 pr_err(" protocol %d not registered, and writing? ",
796 pr_debug("%d to be written", skb->len);
799 /* st_ll to decide where to enqueue the skb */
800 st_int_enqueue(st_gdata, skb);
802 st_tx_wakeup(st_gdata);
804 /* return number of bytes written */
808 /* for protocols making use of shared transport */
809 EXPORT_SYMBOL_GPL(st_unregister);
811 /********************************************************************/
813 * functions called from TTY layer
815 static int st_tty_open(struct tty_struct *tty)
818 struct st_data_s *st_gdata;
819 pr_info("%s ", __func__);
821 st_kim_ref(&st_gdata);
823 tty->disc_data = st_gdata;
825 /* don't do an wakeup for now */
826 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
828 /* mem already allocated
830 tty->receive_room = 65536;
831 /* Flush any pending characters in the driver and discipline. */
832 tty_ldisc_flush(tty);
833 tty_driver_flush_buffer(tty);
835 * signal to UIM via KIM that -
836 * installation of N_TI_WL ldisc is complete
838 st_kim_complete(st_gdata->kim_data);
839 pr_debug("done %s", __func__);
843 static void st_tty_close(struct tty_struct *tty)
845 unsigned char i = ST_MAX;
846 unsigned long flags = 0;
847 struct st_data_s *st_gdata = tty->disc_data;
849 pr_info("%s ", __func__);
852 * if a protocol has been registered & line discipline
853 * un-installed for some reason - what should be done ?
855 spin_lock_irqsave(&st_gdata->lock, flags);
856 for (i = ST_BT; i < ST_MAX; i++) {
857 if (st_gdata->list[i] != NULL)
858 pr_err("%d not un-registered", i);
859 st_gdata->list[i] = NULL;
861 st_gdata->protos_registered = 0;
862 spin_unlock_irqrestore(&st_gdata->lock, flags);
864 * signal to UIM via KIM that -
865 * N_TI_WL ldisc is un-installed
867 st_kim_complete(st_gdata->kim_data);
868 st_gdata->tty = NULL;
869 /* Flush any pending characters in the driver and discipline. */
870 tty_ldisc_flush(tty);
871 tty_driver_flush_buffer(tty);
873 spin_lock_irqsave(&st_gdata->lock, flags);
874 /* empty out txq and tx_waitq */
875 skb_queue_purge(&st_gdata->txq);
876 skb_queue_purge(&st_gdata->tx_waitq);
877 /* reset the TTY Rx states of ST */
878 st_gdata->rx_count = 0;
879 st_gdata->rx_state = ST_W4_PACKET_TYPE;
880 kfree_skb(st_gdata->rx_skb);
881 st_gdata->rx_skb = NULL;
882 spin_unlock_irqrestore(&st_gdata->lock, flags);
884 pr_debug("%s: done ", __func__);
887 static void st_tty_receive(struct tty_struct *tty, const unsigned char *data,
888 char *tty_flags, int count)
892 print_hex_dump(KERN_DEBUG, ">in>", DUMP_PREFIX_NONE,
893 16, 1, data, count, 0);
897 * if fw download is in progress then route incoming data
898 * to KIM for validation
900 st_recv(tty->disc_data, data, count);
901 pr_debug("done %s", __func__);
904 /* wake-up function called in from the TTY layer
905 * inside the internal wakeup function will be called
907 static void st_tty_wakeup(struct tty_struct *tty)
909 struct st_data_s *st_gdata = tty->disc_data;
910 pr_debug("%s ", __func__);
911 /* don't do an wakeup for now */
912 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
914 /* call our internal wakeup */
915 st_tx_wakeup((void *)st_gdata);
918 static void st_tty_flush_buffer(struct tty_struct *tty)
920 struct st_data_s *st_gdata = tty->disc_data;
921 pr_debug("%s ", __func__);
923 kfree_skb(st_gdata->tx_skb);
924 st_gdata->tx_skb = NULL;
926 tty->ops->flush_buffer(tty);
930 /********************************************************************/
931 int st_core_init(struct st_data_s **core_data)
933 struct st_data_s *st_gdata;
935 static struct tty_ldisc_ops *st_ldisc_ops;
937 /* populate and register to TTY line discipline */
938 st_ldisc_ops = kzalloc(sizeof(*st_ldisc_ops), GFP_KERNEL);
940 pr_err("no mem to allocate");
944 st_ldisc_ops->magic = TTY_LDISC_MAGIC;
945 st_ldisc_ops->name = "n_st"; /*"n_hci"; */
946 st_ldisc_ops->open = st_tty_open;
947 st_ldisc_ops->close = st_tty_close;
948 st_ldisc_ops->receive_buf = st_tty_receive;
949 st_ldisc_ops->write_wakeup = st_tty_wakeup;
950 st_ldisc_ops->flush_buffer = st_tty_flush_buffer;
951 st_ldisc_ops->owner = THIS_MODULE;
953 err = tty_register_ldisc(N_TI_WL, st_ldisc_ops);
955 pr_err("error registering %d line discipline %ld",
960 pr_debug("registered n_shared line discipline");
962 st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL);
964 pr_err("memory allocation failed");
965 err = tty_unregister_ldisc(N_TI_WL);
967 pr_err("unable to un-register ldisc %ld", err);
973 /* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's
974 * will be pushed in this queue for actual transmission.
976 skb_queue_head_init(&st_gdata->txq);
977 skb_queue_head_init(&st_gdata->tx_waitq);
979 /* Locking used in st_int_enqueue() to avoid multiple execution */
980 spin_lock_init(&st_gdata->lock);
982 /* ldisc_ops ref to be only used in __exit of module */
983 st_gdata->ldisc_ops = st_ldisc_ops;
988 pr_err("error during kim initialization(%ld)", err);
990 err = tty_unregister_ldisc(N_TI_WL);
992 pr_err("unable to un-register ldisc");
998 err = st_ll_init(st_gdata);
1000 pr_err("error during st_ll initialization(%ld)", err);
1002 err = tty_unregister_ldisc(N_TI_WL);
1004 pr_err("unable to un-register ldisc");
1005 kfree(st_ldisc_ops);
1008 *core_data = st_gdata;
1012 void st_core_exit(struct st_data_s *st_gdata)
1015 /* internal module cleanup */
1016 err = st_ll_deinit(st_gdata);
1018 pr_err("error during deinit of ST LL %ld", err);
1020 err = st_kim_deinit();
1022 pr_err("error during deinit of ST KIM %ld", err);
1024 if (st_gdata != NULL) {
1025 /* Free ST Tx Qs and skbs */
1026 skb_queue_purge(&st_gdata->txq);
1027 skb_queue_purge(&st_gdata->tx_waitq);
1028 kfree_skb(st_gdata->rx_skb);
1029 kfree_skb(st_gdata->tx_skb);
1030 /* TTY ldisc cleanup */
1031 err = tty_unregister_ldisc(N_TI_WL);
1033 pr_err("unable to un-register ldisc %ld", err);
1034 kfree(st_gdata->ldisc_ops);
1035 /* free the global data pointer */