x86, mrst: use a temporary variable for SFI irq
[linux-btrfs-devel.git] / drivers / misc / ti-st / st_core.c
blobba168a7d54d42318d7d192e4158b482844c85be4
1 /*
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
62 * uart tx buffer.
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");
69 return -1;
71 tty = st_gdata->tty;
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
80 * to tty->ops->write
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");
88 return -EINVAL;
90 tty = st_gdata->tty;
91 #ifdef VERBOSE
92 print_hex_dump(KERN_DEBUG, "<out<", DUMP_PREFIX_NONE,
93 16, 1, data, count, 0);
94 #endif
95 return tty->ops->write(tty, data, count);
100 * push the skb received to relevant
101 * protocol stacks
103 void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata)
105 pr_debug(" %s(prot:%d) ", __func__, chnl_id);
107 if (unlikely
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?",
111 chnl_id);
112 kfree_skb(st_gdata->rx_skb);
113 return;
115 /* this cannot fail
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)) {
121 if (unlikely
122 (st_gdata->list[chnl_id]->recv
123 (st_gdata->list[chnl_id]->priv_data, st_gdata->rx_skb)
124 != 0)) {
125 pr_err(" proto stack %d's ->recv failed", chnl_id);
126 kfree_skb(st_gdata->rx_skb);
127 return;
129 } else {
130 pr_err(" proto stack %d's ->recv null", chnl_id);
131 kfree_skb(st_gdata->rx_skb);
133 return;
137 * st_reg_complete -
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)
143 unsigned char i = 0;
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);
167 if (!len) {
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,
179 room);
180 kfree_skb(st_gdata->rx_skb);
181 } else {
182 /* Packet header has non-zero payload length and
183 * we have enough space in created skb. Lets read
184 * payload data */
185 st_gdata->rx_state = ST_W4_DATA;
186 st_gdata->rx_count = len;
187 return len;
190 /* Change ST state to continue to process next
191 * packet */
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;
197 return 0;
201 * st_wakeup_ack - internal function for action when wake-up ack
202 * received
204 static inline void st_wakeup_ack(struct st_data_s *st_gdata,
205 unsigned char cmd)
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
212 * chip is awake
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)
236 char *ptr;
237 struct st_proto_s *proto;
238 unsigned short payload_len = 0;
239 int len = 0, type = 0;
240 unsigned char *plen;
241 struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
242 unsigned long flags;
244 ptr = (char *)data;
245 /* tty_receive sent null ? */
246 if (unlikely(ptr == NULL) || (st_gdata == NULL)) {
247 pr_err(" received null from TTY ");
248 return;
251 pr_debug("count %ld rx_state %ld"
252 "rx_count %ld", count, st_gdata->rx_state,
253 st_gdata->rx_count);
255 spin_lock_irqsave(&st_gdata->lock, flags);
256 /* Decode received bytes here */
257 while (count) {
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;
262 count -= len;
263 ptr += len;
265 if (st_gdata->rx_count)
266 continue;
268 /* Check ST RX state machine , where are we? */
269 switch (st_gdata->rx_state) {
270 /* Waiting for complete packet ? */
271 case ST_W4_DATA:
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;
279 continue;
280 /* parse the header to know details */
281 case ST_W4_HEADER:
282 proto = st_gdata->list[st_gdata->rx_chnl];
283 plen =
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)
290 payload_len =
291 __le16_to_cpu(*(unsigned short *)plen);
292 else
293 pr_info("%s: invalid length "
294 "for id %d\n",
295 __func__, proto->chnl_id);
296 st_check_data_len(st_gdata, proto->chnl_id,
297 payload_len);
298 pr_debug("off %d, pay len %d\n",
299 proto->offset_len_in_hdr, payload_len);
300 continue;
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) */
307 switch (*ptr) {
308 case LL_SLEEP_IND:
309 case LL_SLEEP_ACK:
310 case LL_WAKE_UP_IND:
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);
324 ptr++;
325 count--;
326 continue;
327 case LL_WAKE_UP_ACK:
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);
335 ptr++;
336 count--;
337 continue;
338 /* Unknow packet? */
339 default:
340 type = *ptr;
341 if (st_gdata->list[type] == NULL) {
342 pr_err("chip/interface misbehavior dropping"
343 " frame starting with 0x%02x", type);
344 goto done;
347 st_gdata->rx_skb = alloc_skb(
348 st_gdata->list[type]->max_frame_size,
349 GFP_ATOMIC);
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);
360 ptr++;
361 count--;
363 done:
364 spin_unlock_irqrestore(&st_gdata->lock, flags);
365 pr_debug("done %s", __func__);
366 return;
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
393 * wakeup the chip.
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)) {
405 case ST_LL_AWAKE:
406 pr_debug("ST LL is AWAKE, sending normally");
407 skb_queue_tail(&st_gdata->txq, skb);
408 break;
409 case ST_LL_ASLEEP_TO_AWAKE:
410 skb_queue_tail(&st_gdata->tx_waitq, skb);
411 break;
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));
415 kfree_skb(skb);
416 break;
417 case ST_LL_ASLEEP:
418 skb_queue_tail(&st_gdata->tx_waitq, skb);
419 st_ll_wakeup(st_gdata);
420 break;
421 default:
422 pr_err("ST LL is illegal state(%ld),"
423 "purging received skb.", st_ll_getstate(st_gdata));
424 kfree_skb(skb);
425 break;
428 spin_unlock_irqrestore(&st_gdata->lock, flags);
429 pr_debug("done %s", __func__);
430 return;
434 * internal wakeup function
435 * called from either
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)
441 struct sk_buff *skb;
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");
447 /* keep sending */
448 set_bit(ST_TX_WAKEUP, &st_data->tx_state);
449 return;
450 /* TX_WAKEUP will be checked in another
451 * context
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))) {
458 int len;
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);
463 skb_pull(skb, len);
464 /* if skb->len = len as expected, skb->len=0 */
465 if (skb->len) {
466 /* would be the next skb to be sent */
467 st_data->tx_skb = skb;
468 spin_unlock_irqrestore(&st_data->lock, flags);
469 break;
471 kfree_skb(skb);
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
496 * to be EXPORT-ed
498 long st_register(struct st_proto_s *new_proto)
500 struct st_data_s *st_gdata;
501 long err = 0;
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");
509 return -EINVAL;
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);
519 return -EALREADY;
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);
535 return -EINPROGRESS;
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);
550 if (err != 0) {
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);
557 return -EINVAL;
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 ",
578 new_proto->chnl_id);
579 return -EALREADY;
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);
587 return err;
589 /* if fw is already downloaded & new stack registers protocol */
590 else {
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);
597 return err;
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)
608 long err = 0;
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 */
637 if (st_gdata->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);
644 /* disable ST LL */
645 st_ll_disable(st_gdata);
647 return err;
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;
657 long len;
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");
663 return -EINVAL;
666 pr_debug("%d to be written", skb->len);
667 len = skb->len;
669 /* st_ll to decide where to enqueue the skb */
670 st_int_enqueue(st_gdata, skb);
671 /* wake up */
672 st_tx_wakeup(st_gdata);
674 /* return number of bytes written */
675 return len;
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)
687 int err = 0;
688 struct st_data_s *st_gdata;
689 pr_info("%s ", __func__);
691 st_kim_ref(&st_gdata, 0);
692 st_gdata->tty = tty;
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__);
710 return err;
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__);
721 /* TODO:
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)
761 #ifdef VERBOSE
762 print_hex_dump(KERN_DEBUG, ">in>", DUMP_PREFIX_NONE,
763 16, 1, data, count, 0);
764 #endif
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);
797 return;
800 static struct tty_ldisc_ops st_ldisc_ops = {
801 .magic = TTY_LDISC_MAGIC,
802 .name = "n_st",
803 .open = st_tty_open,
804 .close = st_tty_close,
805 .receive_buf = st_tty_receive,
806 .write_wakeup = st_tty_wakeup,
807 .flush_buffer = st_tty_flush_buffer,
808 .owner = THIS_MODULE
811 /********************************************************************/
812 int st_core_init(struct st_data_s **core_data)
814 struct st_data_s *st_gdata;
815 long err;
817 err = tty_register_ldisc(N_TI_WL, &st_ldisc_ops);
818 if (err) {
819 pr_err("error registering %d line discipline %ld",
820 N_TI_WL, err);
821 return err;
823 pr_debug("registered n_shared line discipline");
825 st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL);
826 if (!st_gdata) {
827 pr_err("memory allocation failed");
828 err = tty_unregister_ldisc(N_TI_WL);
829 if (err)
830 pr_err("unable to un-register ldisc %ld", err);
831 err = -ENOMEM;
832 return 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);
845 if (err) {
846 pr_err("error during st_ll initialization(%ld)", err);
847 kfree(st_gdata);
848 err = tty_unregister_ldisc(N_TI_WL);
849 if (err)
850 pr_err("unable to un-register ldisc");
851 return err;
853 *core_data = st_gdata;
854 return 0;
857 void st_core_exit(struct st_data_s *st_gdata)
859 long err;
860 /* internal module cleanup */
861 err = st_ll_deinit(st_gdata);
862 if (err)
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);
873 if (err)
874 pr_err("unable to un-register ldisc %ld", err);
875 /* free the global data pointer */
876 kfree(st_gdata);