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Staging: ti-st: add version info to sysfs
[net-next-2.6.git] / drivers / staging / ti-st / st_core.c
CommitLineData
53618cc1
PS		 1/*
2 * Shared Transport Line discipline driver Core
3 * This hooks up ST KIM driver and ST LL driver
4 * Copyright (C) 2009 Texas Instruments
5 *
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.
9 *
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.
14 *
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
18 *
19 */
20
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>
26
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>
31#include "fm.h"
32/*
33 * packet formats for fm and gps
34 * #include "gps.h"
35 */
36#include "st_core.h"
37#include "st_kim.h"
38#include "st_ll.h"
39#include "st.h"
40
41#ifdef DEBUG
42/* strings to be used for rfkill entries and by
43 * ST Core to be used for sysfs debug entry
44 */
45#define PROTO_ENTRY(type, name) name
46const unsigned char *protocol_strngs[] = {
47 PROTO_ENTRY(ST_BT, "Bluetooth"),
48 PROTO_ENTRY(ST_FM, "FM"),
49 PROTO_ENTRY(ST_GPS, "GPS"),
50};
51#endif
52/* function pointer pointing to either,
53 * st_kim_recv during registration to receive fw download responses
54 * st_int_recv after registration to receive proto stack responses
55 */
56void (*st_recv) (void*, const unsigned char*, long);
57
58/********************************************************************/
59#if 0
60/* internal misc functions */
61bool is_protocol_list_empty(void)
62{
63 unsigned char i = 0;
64 pr_info(" %s ", __func__);
65 for (i = 0; i < ST_MAX; i++) {
66 if (st_gdata->list[i] != NULL)
67 return ST_NOTEMPTY;
68 /* not empty */
69 }
70 /* list empty */
71 return ST_EMPTY;
72}
73#endif
74/* can be called in from
75 * -- KIM (during fw download)
76 * -- ST Core (during st_write)
77 *
78 * This is the internal write function - a wrapper
79 * to tty->ops->write
80 */
81int st_int_write(struct st_data_s *st_gdata,
82 const unsigned char *data, int count)
83{
84#ifdef VERBOSE /* for debug */
85 int i;
86#endif
87 struct tty_struct *tty;
88 if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
89 pr_err("tty unavailable to perform write");
90 return ST_ERR_FAILURE;
91 }
92 tty = st_gdata->tty;
93#ifdef VERBOSE
94 printk(KERN_ERR "start data..\n");
95 for (i = 0; i < count; i++) /* no newlines for each datum */
96 printk(" %x", data[i]);
97 printk(KERN_ERR "\n ..end data\n");
98#endif
99 return tty->ops->write(tty, data, count);
100
101}
102
103/*
104 * push the skb received to relevant
105 * protocol stacks
106 */
107void st_send_frame(enum proto_type protoid, struct st_data_s *st_gdata)
108{
109 pr_info(" %s(prot:%d) ", __func__, protoid);
110
111 if (unlikely
112 (st_gdata == NULL || st_gdata->rx_skb == NULL
113 || st_gdata->list[protoid] == NULL)) {
114 pr_err("protocol %d not registered, no data to send?",
115 protoid);
116 kfree_skb(st_gdata->rx_skb);
117 return;
118 }
119 /* this cannot fail
120 * this shouldn't take long
121 * - should be just skb_queue_tail for the
122 * protocol stack driver
123 */
124 if (likely(st_gdata->list[protoid]->recv != NULL)) {
125 if (unlikely(st_gdata->list[protoid]->recv(st_gdata->rx_skb)
126 != ST_SUCCESS)) {
127 pr_err(" proto stack %d's ->recv failed", protoid);
128 kfree_skb(st_gdata->rx_skb);
129 return;
130 }
131 } else {
132 pr_err(" proto stack %d's ->recv null", protoid);
133 kfree_skb(st_gdata->rx_skb);
134 }
135 pr_info(" done %s", __func__);
136 return;
137}
138
139/*
140 * to call registration complete callbacks
141 * of all protocol stack drivers
142 */
143void st_reg_complete(struct st_data_s *st_gdata, char err)
144{
145 unsigned char i = 0;
146 pr_info(" %s ", __func__);
147 for (i = 0; i < ST_MAX; i++) {
148 if (likely(st_gdata != NULL && st_gdata->list[i] != NULL &&
149 st_gdata->list[i]->reg_complete_cb != NULL))
150 st_gdata->list[i]->reg_complete_cb(err);
151 }
152}
153
154static inline int st_check_data_len(struct st_data_s *st_gdata,
155 int protoid, int len)
156{
157 register int room = skb_tailroom(st_gdata->rx_skb);
158
159 pr_info("len %d room %d", len, room);
160
161 if (!len) {
162 /* Received packet has only packet header and
163 * has zero length payload. So, ask ST CORE to
164 * forward the packet to protocol driver (BT/FM/GPS)
165 */
166 st_send_frame(protoid, st_gdata);
167
168 } else if (len > room) {
169 /* Received packet's payload length is larger.
170 * We can't accommodate it in created skb.
171 */
172 pr_err("Data length is too large len %d room %d", len,
173 room);
174 kfree_skb(st_gdata->rx_skb);
175 } else {
176 /* Packet header has non-zero payload length and
177 * we have enough space in created skb. Lets read
178 * payload data */
179 st_gdata->rx_state = ST_BT_W4_DATA;
180 st_gdata->rx_count = len;
181 return len;
182 }
183
184 /* Change ST state to continue to process next
185 * packet */
186 st_gdata->rx_state = ST_W4_PACKET_TYPE;
187 st_gdata->rx_skb = NULL;
188 st_gdata->rx_count = 0;
189
190 return 0;
191}
192
193/* internal function for action when wake-up ack
194 * received
195 */
196static inline void st_wakeup_ack(struct st_data_s *st_gdata,
197 unsigned char cmd)
198{
199 register struct sk_buff *waiting_skb;
200 unsigned long flags = 0;
201
202 spin_lock_irqsave(&st_gdata->lock, flags);
203 /* de-Q from waitQ and Q in txQ now that the
204 * chip is awake
205 */
206 while ((waiting_skb = skb_dequeue(&st_gdata->tx_waitq)))
207 skb_queue_tail(&st_gdata->txq, waiting_skb);
208
209 /* state forwarded to ST LL */
210 st_ll_sleep_state(st_gdata, (unsigned long)cmd);
211 spin_unlock_irqrestore(&st_gdata->lock, flags);
212
213 /* wake up to send the recently copied skbs from waitQ */
214 st_tx_wakeup(st_gdata);
215}
216
217/* Decodes received RAW data and forwards to corresponding
218 * client drivers (Bluetooth,FM,GPS..etc).
219 *
220 */
221void st_int_recv(void *disc_data,
222 const unsigned char *data, long count)
223{
224 register char *ptr;
225 struct hci_event_hdr *eh;
226 struct hci_acl_hdr *ah;
227 struct hci_sco_hdr *sh;
228 struct fm_event_hdr *fm;
229 struct gps_event_hdr *gps;
230 register int len = 0, type = 0, dlen = 0;
231 static enum proto_type protoid = ST_MAX;
232 struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
233
234 ptr = (char *)data;
235 /* tty_receive sent null ? */
236 if (unlikely(ptr == NULL) || (st_gdata == NULL)) {
237 pr_err(" received null from TTY ");
238 return;
239 }
240
241 pr_info("count %ld rx_state %ld"
242 "rx_count %ld", count, st_gdata->rx_state,
243 st_gdata->rx_count);
244
245 /* Decode received bytes here */
246 while (count) {
247 if (st_gdata->rx_count) {
248 len = min_t(unsigned int, st_gdata->rx_count, count);
249 memcpy(skb_put(st_gdata->rx_skb, len), ptr, len);
250 st_gdata->rx_count -= len;
251 count -= len;
252 ptr += len;
253
254 if (st_gdata->rx_count)
255 continue;
256
257 /* Check ST RX state machine , where are we? */
258 switch (st_gdata->rx_state) {
259
260 /* Waiting for complete packet ? */
261 case ST_BT_W4_DATA:
262 pr_info("Complete pkt received");
263
264 /* Ask ST CORE to forward
265 * the packet to protocol driver */
266 st_send_frame(protoid, st_gdata);
267
268 st_gdata->rx_state = ST_W4_PACKET_TYPE;
269 st_gdata->rx_skb = NULL;
270 protoid = ST_MAX; /* is this required ? */
271 continue;
272
273 /* Waiting for Bluetooth event header ? */
274 case ST_BT_W4_EVENT_HDR:
275 eh = (struct hci_event_hdr *)st_gdata->rx_skb->
276 data;
277
278 pr_info("Event header: evt 0x%2.2x"
279 "plen %d", eh->evt, eh->plen);
280
281 st_check_data_len(st_gdata, protoid, eh->plen);
282 continue;
283
284 /* Waiting for Bluetooth acl header ? */
285 case ST_BT_W4_ACL_HDR:
286 ah = (struct hci_acl_hdr *)st_gdata->rx_skb->
287 data;
288 dlen = __le16_to_cpu(ah->dlen);
289
290 pr_info("ACL header: dlen %d", dlen);
291
292 st_check_data_len(st_gdata, protoid, dlen);
293 continue;
294
295 /* Waiting for Bluetooth sco header ? */
296 case ST_BT_W4_SCO_HDR:
297 sh = (struct hci_sco_hdr *)st_gdata->rx_skb->
298 data;
299
300 pr_info("SCO header: dlen %d", sh->dlen);
301
302 st_check_data_len(st_gdata, protoid, sh->dlen);
303 continue;
304 case ST_FM_W4_EVENT_HDR:
305 fm = (struct fm_event_hdr *)st_gdata->rx_skb->
306 data;
307 pr_info("FM Header: ");
308 st_check_data_len(st_gdata, ST_FM, fm->plen);
309 continue;
310 /* TODO : Add GPS packet machine logic here */
311 case ST_GPS_W4_EVENT_HDR:
312 /* [0x09 pkt hdr][R/W byte][2 byte len] */
313 gps = (struct gps_event_hdr *)st_gdata->rx_skb->
314 data;
315 pr_info("GPS Header: ");
316 st_check_data_len(st_gdata, ST_GPS, gps->plen);
317 continue;
318 } /* end of switch rx_state */
319 }
320
321 /* end of if rx_count */
322 /* Check first byte of packet and identify module
323 * owner (BT/FM/GPS) */
324 switch (*ptr) {
325
326 /* Bluetooth event packet? */
327 case HCI_EVENT_PKT:
328 pr_info("Event packet");
329 st_gdata->rx_state = ST_BT_W4_EVENT_HDR;
330 st_gdata->rx_count = HCI_EVENT_HDR_SIZE;
331 type = HCI_EVENT_PKT;
332 protoid = ST_BT;
333 break;
334
335 /* Bluetooth acl packet? */
336 case HCI_ACLDATA_PKT:
337 pr_info("ACL packet");
338 st_gdata->rx_state = ST_BT_W4_ACL_HDR;
339 st_gdata->rx_count = HCI_ACL_HDR_SIZE;
340 type = HCI_ACLDATA_PKT;
341 protoid = ST_BT;
342 break;
343
344 /* Bluetooth sco packet? */
345 case HCI_SCODATA_PKT:
346 pr_info("SCO packet");
347 st_gdata->rx_state = ST_BT_W4_SCO_HDR;
348 st_gdata->rx_count = HCI_SCO_HDR_SIZE;
349 type = HCI_SCODATA_PKT;
350 protoid = ST_BT;
351 break;
352
353 /* Channel 8(FM) packet? */
354 case ST_FM_CH8_PKT:
355 pr_info("FM CH8 packet");
356 type = ST_FM_CH8_PKT;
357 st_gdata->rx_state = ST_FM_W4_EVENT_HDR;
358 st_gdata->rx_count = FM_EVENT_HDR_SIZE;
359 protoid = ST_FM;
360 break;
361
362 /* Channel 9(GPS) packet? */
363 case 0x9: /*ST_LL_GPS_CH9_PKT */
364 pr_info("GPS CH9 packet");
365 type = 0x9; /* ST_LL_GPS_CH9_PKT; */
366 protoid = ST_GPS;
367 st_gdata->rx_state = ST_GPS_W4_EVENT_HDR;
368 st_gdata->rx_count = 3; /* GPS_EVENT_HDR_SIZE -1*/
369 break;
370 case LL_SLEEP_IND:
371 case LL_SLEEP_ACK:
372 case LL_WAKE_UP_IND:
373 pr_info("PM packet");
374 /* this takes appropriate action based on
375 * sleep state received --
376 */
377 st_ll_sleep_state(st_gdata, *ptr);
378 ptr++;
379 count--;
380 continue;
381 case LL_WAKE_UP_ACK:
382 pr_info("PM packet");
383 /* wake up ack received */
384 st_wakeup_ack(st_gdata, *ptr);
385 ptr++;
386 count--;
387 continue;
388 /* Unknow packet? */
389 default:
390 pr_err("Unknown packet type %2.2x", (__u8) *ptr);
391 ptr++;
392 count--;
393 continue;
394 };
395 ptr++;
396 count--;
397
398 switch (protoid) {
399 case ST_BT:
400 /* Allocate new packet to hold received data */
401 st_gdata->rx_skb =
402 bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
403 if (!st_gdata->rx_skb) {
404 pr_err("Can't allocate mem for new packet");
405 st_gdata->rx_state = ST_W4_PACKET_TYPE;
406 st_gdata->rx_count = 0;
407 return;
408 }
409 bt_cb(st_gdata->rx_skb)->pkt_type = type;
410 break;
411 case ST_FM: /* for FM */
412 st_gdata->rx_skb =
413 alloc_skb(FM_MAX_FRAME_SIZE, GFP_ATOMIC);
414 if (!st_gdata->rx_skb) {
415 pr_err("Can't allocate mem for new packet");
416 st_gdata->rx_state = ST_W4_PACKET_TYPE;
417 st_gdata->rx_count = 0;
418 return;
419 }
420 /* place holder 0x08 */
421 skb_reserve(st_gdata->rx_skb, 1);
422 st_gdata->rx_skb->cb[0] = ST_FM_CH8_PKT;
423 break;
424 case ST_GPS:
425 /* for GPS */
426 st_gdata->rx_skb =
427 alloc_skb(100 /*GPS_MAX_FRAME_SIZE */ , GFP_ATOMIC);
428 if (!st_gdata->rx_skb) {
429 pr_err("Can't allocate mem for new packet");
430 st_gdata->rx_state = ST_W4_PACKET_TYPE;
431 st_gdata->rx_count = 0;
432 return;
433 }
434 /* place holder 0x09 */
435 skb_reserve(st_gdata->rx_skb, 1);
436 st_gdata->rx_skb->cb[0] = 0x09; /*ST_GPS_CH9_PKT; */
437 break;
438 case ST_MAX:
439 break;
440 }
441 }
442 pr_info("done %s", __func__);
443 return;
444}
445
446/* internal de-Q function
447 * -- return previous in-completely written skb
448 * or return the skb in the txQ
449 */
450struct sk_buff *st_int_dequeue(struct st_data_s *st_gdata)
451{
452 struct sk_buff *returning_skb;
453
454 pr_info("%s", __func__);
455 /* if the previous skb wasn't written completely
456 */
457 if (st_gdata->tx_skb != NULL) {
458 returning_skb = st_gdata->tx_skb;
459 st_gdata->tx_skb = NULL;
460 return returning_skb;
461 }
462
463 /* de-Q from the txQ always if previous write is complete */
464 return skb_dequeue(&st_gdata->txq);
465}
466
467/* internal Q-ing function
468 * will either Q the skb to txq or the tx_waitq
469 * depending on the ST LL state
470 *
471 * lock the whole func - since ll_getstate and Q-ing should happen
472 * in one-shot
473 */
474void st_int_enqueue(struct st_data_s *st_gdata, struct sk_buff *skb)
475{
476 unsigned long flags = 0;
477
478 pr_info("%s", __func__);
479 /* this function can be invoked in more then one context.
480 * so have a lock */
481 spin_lock_irqsave(&st_gdata->lock, flags);
482
483 switch (st_ll_getstate(st_gdata)) {
484 case ST_LL_AWAKE:
485 pr_info("ST LL is AWAKE, sending normally");
486 skb_queue_tail(&st_gdata->txq, skb);
487 break;
488 case ST_LL_ASLEEP_TO_AWAKE:
489 skb_queue_tail(&st_gdata->tx_waitq, skb);
490 break;
491 case ST_LL_AWAKE_TO_ASLEEP: /* host cannot be in this state */
492 pr_err("ST LL is illegal state(%ld),"
493 "purging received skb.", st_ll_getstate(st_gdata));
494 kfree_skb(skb);
495 break;
496
497 case ST_LL_ASLEEP:
498 /* call a function of ST LL to put data
499 * in tx_waitQ and wake_ind in txQ
500 */
501 skb_queue_tail(&st_gdata->tx_waitq, skb);
502 st_ll_wakeup(st_gdata);
503 break;
504 default:
505 pr_err("ST LL is illegal state(%ld),"
506 "purging received skb.", st_ll_getstate(st_gdata));
507 kfree_skb(skb);
508 break;
509 }
510 spin_unlock_irqrestore(&st_gdata->lock, flags);
511 pr_info("done %s", __func__);
512 return;
513}
514
515/*
516 * internal wakeup function
517 * called from either
518 * - TTY layer when write's finished
519 * - st_write (in context of the protocol stack)
520 */
521void st_tx_wakeup(struct st_data_s *st_data)
522{
523 struct sk_buff *skb;
524 unsigned long flags; /* for irq save flags */
525 pr_info("%s", __func__);
526 /* check for sending & set flag sending here */
527 if (test_and_set_bit(ST_TX_SENDING, &st_data->tx_state)) {
528 pr_info("ST already sending");
529 /* keep sending */
530 set_bit(ST_TX_WAKEUP, &st_data->tx_state);
531 return;
532 /* TX_WAKEUP will be checked in another
533 * context
534 */
535 }
536 do { /* come back if st_tx_wakeup is set */
537 /* woke-up to write */
538 clear_bit(ST_TX_WAKEUP, &st_data->tx_state);
539 while ((skb = st_int_dequeue(st_data))) {
540 int len;
541 spin_lock_irqsave(&st_data->lock, flags);
542 /* enable wake-up from TTY */
543 set_bit(TTY_DO_WRITE_WAKEUP, &st_data->tty->flags);
544 len = st_int_write(st_data, skb->data, skb->len);
545 skb_pull(skb, len);
546 /* if skb->len = len as expected, skb->len=0 */
547 if (skb->len) {
548 /* would be the next skb to be sent */
549 st_data->tx_skb = skb;
550 spin_unlock_irqrestore(&st_data->lock, flags);
551 break;
552 }
553 kfree_skb(skb);
554 spin_unlock_irqrestore(&st_data->lock, flags);
555 }
556 /* if wake-up is set in another context- restart sending */
557 } while (test_bit(ST_TX_WAKEUP, &st_data->tx_state));
558
559 /* clear flag sending */
560 clear_bit(ST_TX_SENDING, &st_data->tx_state);
561}
562
563/********************************************************************/
564/* functions called from ST KIM
565*/
566void kim_st_list_protocols(struct st_data_s *st_gdata, char *buf)
567{
568 unsigned long flags = 0;
569#ifdef DEBUG
570 unsigned char i = ST_MAX;
571#endif
572 spin_lock_irqsave(&st_gdata->lock, flags);
573#ifdef DEBUG /* more detailed log */
574 for (i = 0; i < ST_MAX; i++) {
575 if (i == 0) {
576 sprintf(buf, "%s is %s", protocol_strngs[i],
577 st_gdata->list[i] !=
578 NULL ? "Registered" : "Unregistered");
579 } else {
580 sprintf(buf, "%s\n%s is %s", buf, protocol_strngs[i],
581 st_gdata->list[i] !=
582 NULL ? "Registered" : "Unregistered");
583 }
584 }
585 sprintf(buf, "%s\n", buf);
586#else /* limited info */
587 sprintf(buf, "BT=%c\nFM=%c\nGPS=%c\n",
588 st_gdata->list[ST_BT] != NULL ? 'R' : 'U',
589 st_gdata->list[ST_FM] != NULL ? 'R' : 'U',
590 st_gdata->list[ST_GPS] != NULL ? 'R' : 'U');
591#endif
592 spin_unlock_irqrestore(&st_gdata->lock, flags);
593}
594
595/********************************************************************/
596/*
597 * functions called from protocol stack drivers
598 * to be EXPORT-ed
599 */
600long st_register(struct st_proto_s *new_proto)
601{
602 struct st_data_s *st_gdata;
603 long err = ST_SUCCESS;
604 unsigned long flags = 0;
605
606 st_kim_ref(&st_gdata);
607 pr_info("%s(%d) ", __func__, new_proto->type);
608 if (st_gdata == NULL || new_proto == NULL || new_proto->recv == NULL
609 || new_proto->reg_complete_cb == NULL) {
610 pr_err("gdata/new_proto/recv or reg_complete_cb not ready");
611 return ST_ERR_FAILURE;
612 }
613
614 if (new_proto->type < ST_BT || new_proto->type >= ST_MAX) {
615 pr_err("protocol %d not supported", new_proto->type);
616 return ST_ERR_NOPROTO;
617 }
618
619 if (st_gdata->list[new_proto->type] != NULL) {
620 pr_err("protocol %d already registered", new_proto->type);
621 return ST_ERR_ALREADY;
622 }
623
624 /* can be from process context only */
625 spin_lock_irqsave(&st_gdata->lock, flags);
626
627 if (test_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state)) {
628 pr_info(" ST_REG_IN_PROGRESS:%d ", new_proto->type);
629 /* fw download in progress */
630 st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
631
632 st_gdata->list[new_proto->type] = new_proto;
633 new_proto->write = st_write;
634
635 set_bit(ST_REG_PENDING, &st_gdata->st_state);
636 spin_unlock_irqrestore(&st_gdata->lock, flags);
637 return ST_ERR_PENDING;
638 } else if (st_gdata->protos_registered == ST_EMPTY) {
639 pr_info(" protocol list empty :%d ", new_proto->type);
640 set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
641 st_recv = st_kim_recv;
642
643 /* release lock previously held - re-locked below */
644 spin_unlock_irqrestore(&st_gdata->lock, flags);
645
646 /* enable the ST LL - to set default chip state */
647 st_ll_enable(st_gdata);
648 /* this may take a while to complete
649 * since it involves BT fw download
650 */
651 err = st_kim_start();
652 if (err != ST_SUCCESS) {
653 clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
654 if ((st_gdata->protos_registered != ST_EMPTY) &&
655 (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
656 pr_err(" KIM failure complete callback ");
657 st_reg_complete(st_gdata, ST_ERR_FAILURE);
658 }
659
660 return ST_ERR_FAILURE;
661 }
662
663 /* the protocol might require other gpios to be toggled
664 */
665 st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
666
667 clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state);
668 st_recv = st_int_recv;
669
670 /* this is where all pending registration
671 * are signalled to be complete by calling callback functions
672 */
673 if ((st_gdata->protos_registered != ST_EMPTY) &&
674 (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
675 pr_info(" call reg complete callback ");
676 st_gdata->protos_registered++;
677 st_reg_complete(st_gdata, ST_SUCCESS);
678 }
679 clear_bit(ST_REG_PENDING, &st_gdata->st_state);
680
681 /* check for already registered once more,
682 * since the above check is old
683 */
684 if (st_gdata->list[new_proto->type] != NULL) {
685 pr_err(" proto %d already registered ",
686 new_proto->type);
687 return ST_ERR_ALREADY;
688 }
689
690 spin_lock_irqsave(&st_gdata->lock, flags);
691 st_gdata->list[new_proto->type] = new_proto;
692 new_proto->write = st_write;
693 spin_unlock_irqrestore(&st_gdata->lock, flags);
694 return err;
695 }
696 /* if fw is already downloaded & new stack registers protocol */
697 else {
698 switch (new_proto->type) {
699 case ST_BT:
700 /* do nothing */
701 break;
702 case ST_FM:
703 case ST_GPS:
704 st_kim_chip_toggle(new_proto->type, KIM_GPIO_ACTIVE);
705 break;
706 case ST_MAX:
707 default:
708 pr_err("%d protocol not supported",
709 new_proto->type);
710 err = ST_ERR_NOPROTO;
711 /* something wrong */
712 break;
713 }
714 st_gdata->list[new_proto->type] = new_proto;
715 new_proto->write = st_write;
716
717 /* lock already held before entering else */
718 spin_unlock_irqrestore(&st_gdata->lock, flags);
719 return err;
720 }
721 pr_info("done %s(%d) ", __func__, new_proto->type);
722}
723EXPORT_SYMBOL_GPL(st_register);
724
725/* to unregister a protocol -
726 * to be called from protocol stack driver
727 */
728long st_unregister(enum proto_type type)
729{
730 long err = ST_SUCCESS;
731 unsigned long flags = 0;
732 struct st_data_s *st_gdata;
733
734 pr_info("%s: %d ", __func__, type);
735
736 st_kim_ref(&st_gdata);
737 if (type < ST_BT || type >= ST_MAX) {
738 pr_err(" protocol %d not supported", type);
739 return ST_ERR_NOPROTO;
740 }
741
742 spin_lock_irqsave(&st_gdata->lock, flags);
743
744 if (st_gdata->list[type] == NULL) {
745 pr_err(" protocol %d not registered", type);
746 spin_unlock_irqrestore(&st_gdata->lock, flags);
747 return ST_ERR_NOPROTO;
748 }
749
750 st_gdata->protos_registered--;
751 st_gdata->list[type] = NULL;
752
753 /* kim ignores BT in the below function
754 * and handles the rest, BT is toggled
755 * only in kim_start and kim_stop
756 */
757 st_kim_chip_toggle(type, KIM_GPIO_INACTIVE);
758 spin_unlock_irqrestore(&st_gdata->lock, flags);
759
760 if ((st_gdata->protos_registered == ST_EMPTY) &&
761 (!test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
762 pr_info(" all protocols unregistered ");
763
764 /* stop traffic on tty */
765 if (st_gdata->tty) {
766 tty_ldisc_flush(st_gdata->tty);
767 stop_tty(st_gdata->tty);
768 }
769
770 /* all protocols now unregistered */
771 st_kim_stop();
772 /* disable ST LL */
773 st_ll_disable(st_gdata);
774 }
775 return err;
776}
777
778/*
779 * called in protocol stack drivers
780 * via the write function pointer
781 */
782long st_write(struct sk_buff *skb)
783{
784 struct st_data_s *st_gdata;
785#ifdef DEBUG
786 enum proto_type protoid = ST_MAX;
787#endif
788 long len;
789
790 st_kim_ref(&st_gdata);
791 if (unlikely(skb == NULL || st_gdata == NULL
792 || st_gdata->tty == NULL)) {
793 pr_err("data/tty unavailable to perform write");
794 return ST_ERR_FAILURE;
795 }
796#ifdef DEBUG /* open-up skb to read the 1st byte */
797 switch (skb->data[0]) {
798 case HCI_COMMAND_PKT:
799 case HCI_ACLDATA_PKT:
800 case HCI_SCODATA_PKT:
801 protoid = ST_BT;
802 break;
803 case ST_FM_CH8_PKT:
804 protoid = ST_FM;
805 break;
806 case 0x09:
807 protoid = ST_GPS;
808 break;
809 }
810 if (unlikely(st_gdata->list[protoid] == NULL)) {
811 pr_err(" protocol %d not registered, and writing? ",
812 protoid);
813 return ST_ERR_FAILURE;
814 }
815#endif
816 pr_info("%d to be written", skb->len);
817 len = skb->len;
818
819 /* st_ll to decide where to enqueue the skb */
820 st_int_enqueue(st_gdata, skb);
821 /* wake up */
822 st_tx_wakeup(st_gdata);
823
824 /* return number of bytes written */
825 return len;
826}
827
828/* for protocols making use of shared transport */
829EXPORT_SYMBOL_GPL(st_unregister);
830
831/********************************************************************/
832/*
833 * functions called from TTY layer
834 */
835static int st_tty_open(struct tty_struct *tty)
836{
837 int err = ST_SUCCESS;
838 struct st_data_s *st_gdata;
839 pr_info("%s ", __func__);
840
841 st_kim_ref(&st_gdata);
842 st_gdata->tty = tty;
843 tty->disc_data = st_gdata;
844
845 /* don't do an wakeup for now */
846 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
847
848 /* mem already allocated
849 */
850 tty->receive_room = 65536;
851 /* Flush any pending characters in the driver and discipline. */
852 tty_ldisc_flush(tty);
853 tty_driver_flush_buffer(tty);
854 /*
855 * signal to UIM via KIM that -
856 * installation of N_TI_WL ldisc is complete
857 */
858 st_kim_complete();
859 pr_info("done %s", __func__);
860 return err;
861}
862
863static void st_tty_close(struct tty_struct *tty)
864{
865 unsigned char i = ST_MAX;
866 unsigned long flags = 0;
867 struct st_data_s *st_gdata = tty->disc_data;
868
869 pr_info("%s ", __func__);
870
871 /* TODO:
872 * if a protocol has been registered & line discipline
873 * un-installed for some reason - what should be done ?
874 */
875 spin_lock_irqsave(&st_gdata->lock, flags);
876 for (i = ST_BT; i < ST_MAX; i++) {
877 if (st_gdata->list[i] != NULL)
878 pr_err("%d not un-registered", i);
879 st_gdata->list[i] = NULL;
880 }
881 spin_unlock_irqrestore(&st_gdata->lock, flags);
882 /*
883 * signal to UIM via KIM that -
884 * N_TI_WL ldisc is un-installed
885 */
886 st_kim_complete();
887 st_gdata->tty = NULL;
888 /* Flush any pending characters in the driver and discipline. */
889 tty_ldisc_flush(tty);
890 tty_driver_flush_buffer(tty);
891
892 spin_lock_irqsave(&st_gdata->lock, flags);
893 /* empty out txq and tx_waitq */
894 skb_queue_purge(&st_gdata->txq);
895 skb_queue_purge(&st_gdata->tx_waitq);
896 /* reset the TTY Rx states of ST */
897 st_gdata->rx_count = 0;
898 st_gdata->rx_state = ST_W4_PACKET_TYPE;
899 kfree_skb(st_gdata->rx_skb);
900 st_gdata->rx_skb = NULL;
901 spin_unlock_irqrestore(&st_gdata->lock, flags);
902
903 pr_info("%s: done ", __func__);
904}
905
906static void st_tty_receive(struct tty_struct *tty, const unsigned char *data,
907 char *tty_flags, int count)
908{
909
910#ifdef VERBOSE
911 long i;
912 printk(KERN_ERR "incoming data...\n");
913 for (i = 0; i < count; i++)
914 printk(" %x", data[i]);
915 printk(KERN_ERR "\n.. data end\n");
916#endif
917
918 /*
919 * if fw download is in progress then route incoming data
920 * to KIM for validation
921 */
922 st_recv(tty->disc_data, data, count);
923 pr_info("done %s", __func__);
924}
925
926/* wake-up function called in from the TTY layer
927 * inside the internal wakeup function will be called
928 */
929static void st_tty_wakeup(struct tty_struct *tty)
930{
931 struct st_data_s *st_gdata = tty->disc_data;
932 pr_info("%s ", __func__);
933 /* don't do an wakeup for now */
934 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
935
936 /* call our internal wakeup */
937 st_tx_wakeup((void *)st_gdata);
938}
939
940static void st_tty_flush_buffer(struct tty_struct *tty)
941{
942 struct st_data_s *st_gdata = tty->disc_data;
943 pr_info("%s ", __func__);
944
945 kfree_skb(st_gdata->tx_skb);
946 st_gdata->tx_skb = NULL;
947
948 tty->ops->flush_buffer(tty);
949 return;
950}
951
952/********************************************************************/
953int st_core_init(struct st_data_s **core_data)
954{
955 struct st_data_s *st_gdata;
956 long err;
957 static struct tty_ldisc_ops *st_ldisc_ops;
958
959 /* populate and register to TTY line discipline */
960 st_ldisc_ops = kzalloc(sizeof(*st_ldisc_ops), GFP_KERNEL);
961 if (!st_ldisc_ops) {
962 pr_err("no mem to allocate");
963 return -ENOMEM;
964 }
965
966 st_ldisc_ops->magic = TTY_LDISC_MAGIC;
967 st_ldisc_ops->name = "n_st"; /*"n_hci"; */
968 st_ldisc_ops->open = st_tty_open;
969 st_ldisc_ops->close = st_tty_close;
970 st_ldisc_ops->receive_buf = st_tty_receive;
971 st_ldisc_ops->write_wakeup = st_tty_wakeup;
972 st_ldisc_ops->flush_buffer = st_tty_flush_buffer;
973 st_ldisc_ops->owner = THIS_MODULE;
974
975 err = tty_register_ldisc(N_TI_WL, st_ldisc_ops);
976 if (err) {
977 pr_err("error registering %d line discipline %ld",
978 N_TI_WL, err);
979 kfree(st_ldisc_ops);
980 return err;
981 }
982 pr_info("registered n_shared line discipline");
983
984 st_gdata = kzalloc(sizeof(struct st_data_s), GFP_KERNEL);
985 if (!st_gdata) {
986 pr_err("memory allocation failed");
987 err = tty_unregister_ldisc(N_TI_WL);
988 if (err)
989 pr_err("unable to un-register ldisc %ld", err);
990 kfree(st_ldisc_ops);
991 err = -ENOMEM;
992 return err;
993 }
994
995 /* Initialize ST TxQ and Tx waitQ queue head. All BT/FM/GPS module skb's
996 * will be pushed in this queue for actual transmission.
997 */
998 skb_queue_head_init(&st_gdata->txq);
999 skb_queue_head_init(&st_gdata->tx_waitq);
1000
1001 /* Locking used in st_int_enqueue() to avoid multiple execution */
1002 spin_lock_init(&st_gdata->lock);
1003
1004 /* ldisc_ops ref to be only used in __exit of module */
1005 st_gdata->ldisc_ops = st_ldisc_ops;
1006
1007#if 0
1008 err = st_kim_init();
1009 if (err) {
1010 pr_err("error during kim initialization(%ld)", err);
1011 kfree(st_gdata);
1012 err = tty_unregister_ldisc(N_TI_WL);
1013 if (err)
1014 pr_err("unable to un-register ldisc");
1015 kfree(st_ldisc_ops);
1016 return -1;
1017 }
1018#endif
1019
1020 err = st_ll_init(st_gdata);
1021 if (err) {
1022 pr_err("error during st_ll initialization(%ld)", err);
1023 kfree(st_gdata);
1024 err = tty_unregister_ldisc(N_TI_WL);
1025 if (err)
1026 pr_err("unable to un-register ldisc");
1027 kfree(st_ldisc_ops);
1028 return -1;
1029 }
1030 *core_data = st_gdata;
1031 return 0;
1032}
1033
1034void st_core_exit(struct st_data_s *st_gdata)
1035{
1036 long err;
1037 /* internal module cleanup */
1038 err = st_ll_deinit(st_gdata);
1039 if (err)
1040 pr_err("error during deinit of ST LL %ld", err);
1041#if 0
1042 err = st_kim_deinit();
1043 if (err)
1044 pr_err("error during deinit of ST KIM %ld", err);
1045#endif
1046 if (st_gdata != NULL) {
1047 /* Free ST Tx Qs and skbs */
1048 skb_queue_purge(&st_gdata->txq);
1049 skb_queue_purge(&st_gdata->tx_waitq);
1050 kfree_skb(st_gdata->rx_skb);
1051 kfree_skb(st_gdata->tx_skb);
1052 /* TTY ldisc cleanup */
1053 err = tty_unregister_ldisc(N_TI_WL);
1054 if (err)
1055 pr_err("unable to un-register ldisc %ld", err);
1056 kfree(st_gdata->ldisc_ops);
1057 /* free the global data pointer */
1058 kfree(st_gdata);
1059 }
1060}
1061
1062
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