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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / bluetooth / hci_bcsp.c
CommitLineData
1da177e4 1/*
0372a662
MH		 2 *
3 * Bluetooth HCI UART driver
4 *
5 * Copyright (C) 2002-2003 Fabrizio Gennari <fabrizio.gennari@philips.com>
6 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
7 *
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
1da177e4
LT		 23 */
24
1da177e4
LT		 25#include <linux/module.h>
26
27#include <linux/kernel.h>
28#include <linux/init.h>
1da177e4
LT		 29#include <linux/types.h>
30#include <linux/fcntl.h>
31#include <linux/interrupt.h>
32#include <linux/ptrace.h>
33#include <linux/poll.h>
34
35#include <linux/slab.h>
36#include <linux/tty.h>
37#include <linux/errno.h>
38#include <linux/string.h>
39#include <linux/signal.h>
40#include <linux/ioctl.h>
41#include <linux/skbuff.h>
c5ec5140
HH		 42#include <linux/bitrev.h>
43#include <asm/unaligned.h>
1da177e4
LT		 44
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
0372a662 47
1da177e4 48#include "hci_uart.h"
1da177e4 49
0372a662
MH		 50#define VERSION "0.3"
51
90ab5ee9
RR		 52static bool txcrc = 1;
53static bool hciextn = 1;
1da177e4 54
0372a662
MH		 55#define BCSP_TXWINSIZE 4
56
57#define BCSP_ACK_PKT 0x05
58#define BCSP_LE_PKT 0x06
59
60struct bcsp_struct {
61 struct sk_buff_head unack; /* Unack'ed packets queue */
62 struct sk_buff_head rel; /* Reliable packets queue */
63 struct sk_buff_head unrel; /* Unreliable packets queue */
64
65 unsigned long rx_count;
66 struct sk_buff *rx_skb;
67 u8 rxseq_txack; /* rxseq == txack. */
68 u8 rxack; /* Last packet sent by us that the peer ack'ed */
69 struct timer_list tbcsp;
70
71 enum {
72 BCSP_W4_PKT_DELIMITER,
73 BCSP_W4_PKT_START,
74 BCSP_W4_BCSP_HDR,
75 BCSP_W4_DATA,
76 BCSP_W4_CRC
77 } rx_state;
78
79 enum {
80 BCSP_ESCSTATE_NOESC,
81 BCSP_ESCSTATE_ESC
82 } rx_esc_state;
83
84 u8 use_crc;
85 u16 message_crc;
86 u8 txack_req; /* Do we need to send ack's to the peer? */
87
88 /* Reliable packet sequence number - used to assign seq to each rel pkt. */
89 u8 msgq_txseq;
90};
91
1da177e4
LT		 92/* ---- BCSP CRC calculation ---- */
93
94/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
95initial value 0xffff, bits shifted in reverse order. */
96
97static const u16 crc_table[] = {
98 0x0000, 0x1081, 0x2102, 0x3183,
99 0x4204, 0x5285, 0x6306, 0x7387,
100 0x8408, 0x9489, 0xa50a, 0xb58b,
101 0xc60c, 0xd68d, 0xe70e, 0xf78f
102};
103
104/* Initialise the crc calculator */
105#define BCSP_CRC_INIT(x) x = 0xffff
106
107/*
108 Update crc with next data byte
109
110 Implementation note
111 The data byte is treated as two nibbles. The crc is generated
112 in reverse, i.e., bits are fed into the register from the top.
113*/
114static void bcsp_crc_update(u16 *crc, u8 d)
115{
116 u16 reg = *crc;
117
118 reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f];
119 reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f];
120
121 *crc = reg;
122}
123
1da177e4
LT		 124/* ---- BCSP core ---- */
125
126static void bcsp_slip_msgdelim(struct sk_buff *skb)
127{
128 const char pkt_delim = 0xc0;
0372a662 129
1da177e4
LT		 130 memcpy(skb_put(skb, 1), &pkt_delim, 1);
131}
132
133static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c)
134{
135 const char esc_c0[2] = { 0xdb, 0xdc };
136 const char esc_db[2] = { 0xdb, 0xdd };
137
138 switch (c) {
139 case 0xc0:
140 memcpy(skb_put(skb, 2), &esc_c0, 2);
141 break;
142 case 0xdb:
143 memcpy(skb_put(skb, 2), &esc_db, 2);
144 break;
145 default:
146 memcpy(skb_put(skb, 1), &c, 1);
147 }
148}
149
150static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb)
151{
152 struct bcsp_struct *bcsp = hu->priv;
153
154 if (skb->len > 0xFFF) {
155 BT_ERR("Packet too long");
156 kfree_skb(skb);
157 return 0;
158 }
159
0d48d939 160 switch (bt_cb(skb)->pkt_type) {
1da177e4
LT		 161 case HCI_ACLDATA_PKT:
162 case HCI_COMMAND_PKT:
163 skb_queue_tail(&bcsp->rel, skb);
164 break;
165
166 case HCI_SCODATA_PKT:
167 skb_queue_tail(&bcsp->unrel, skb);
168 break;
169
170 default:
171 BT_ERR("Unknown packet type");
172 kfree_skb(skb);
173 break;
174 }
175
176 return 0;
177}
178
179static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data,
180 int len, int pkt_type)
181{
182 struct sk_buff *nskb;
183 u8 hdr[4], chan;
1da177e4 184 u16 BCSP_CRC_INIT(bcsp_txmsg_crc);
20dd6f59 185 int rel, i;
1da177e4
LT		 186
187 switch (pkt_type) {
188 case HCI_ACLDATA_PKT:
189 chan = 6; /* BCSP ACL channel */
190 rel = 1; /* reliable channel */
191 break;
192 case HCI_COMMAND_PKT:
193 chan = 5; /* BCSP cmd/evt channel */
194 rel = 1; /* reliable channel */
195 break;
196 case HCI_SCODATA_PKT:
197 chan = 7; /* BCSP SCO channel */
198 rel = 0; /* unreliable channel */
199 break;
200 case BCSP_LE_PKT:
201 chan = 1; /* BCSP LE channel */
202 rel = 0; /* unreliable channel */
203 break;
204 case BCSP_ACK_PKT:
205 chan = 0; /* BCSP internal channel */
206 rel = 0; /* unreliable channel */
207 break;
208 default:
209 BT_ERR("Unknown packet type");
210 return NULL;
211 }
212
213 if (hciextn && chan == 5) {
c5ec5140 214 __le16 opcode = ((struct hci_command_hdr *)data)->opcode;
1da177e4 215
a9de9248 216 /* Vendor specific commands */
c5ec5140 217 if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) {
1da177e4
LT		 218 u8 desc = *(data + HCI_COMMAND_HDR_SIZE);
219 if ((desc & 0xf0) == 0xc0) {
220 data += HCI_COMMAND_HDR_SIZE + 1;
221 len -= HCI_COMMAND_HDR_SIZE + 1;
222 chan = desc & 0x0f;
223 }
224 }
225 }
226
227 /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2
228 (because bytes 0xc0 and 0xdb are escaped, worst case is
229 when the packet is all made of 0xc0 and 0xdb :) )
230 + 2 (0xc0 delimiters at start and end). */
231
232 nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
233 if (!nskb)
234 return NULL;
235
0d48d939 236 bt_cb(nskb)->pkt_type = pkt_type;
1da177e4
LT		 237
238 bcsp_slip_msgdelim(nskb);
239
240 hdr[0] = bcsp->rxseq_txack << 3;
241 bcsp->txack_req = 0;
242 BT_DBG("We request packet no %u to card", bcsp->rxseq_txack);
243
244 if (rel) {
245 hdr[0] |= 0x80 + bcsp->msgq_txseq;
246 BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq);
dd1589a4 247 bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07;
1da177e4 248 }
20dd6f59
MH		 249
250 if (bcsp->use_crc)
251 hdr[0] |= 0x40;
1da177e4
LT		 252
253 hdr[1] = ((len << 4) & 0xff) | chan;
254 hdr[2] = len >> 4;
255 hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]);
256
257 /* Put BCSP header */
258 for (i = 0; i < 4; i++) {
259 bcsp_slip_one_byte(nskb, hdr[i]);
20dd6f59
MH		 260
261 if (bcsp->use_crc)
262 bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]);
1da177e4
LT		 263 }
264
265 /* Put payload */
266 for (i = 0; i < len; i++) {
267 bcsp_slip_one_byte(nskb, data[i]);
20dd6f59
MH		 268
269 if (bcsp->use_crc)
270 bcsp_crc_update(&bcsp_txmsg_crc, data[i]);
1da177e4
LT		 271 }
272
1da177e4 273 /* Put CRC */
20dd6f59 274 if (bcsp->use_crc) {
c5ec5140 275 bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc);
20dd6f59
MH		 276 bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff));
277 bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff));
278 }
1da177e4
LT		 279
280 bcsp_slip_msgdelim(nskb);
281 return nskb;
282}
283
284/* This is a rewrite of pkt_avail in ABCSP */
285static struct sk_buff *bcsp_dequeue(struct hci_uart *hu)
286{
287 struct bcsp_struct *bcsp = hu->priv;
288 unsigned long flags;
289 struct sk_buff *skb;
290
291 /* First of all, check for unreliable messages in the queue,
292 since they have priority */
293
294 if ((skb = skb_dequeue(&bcsp->unrel)) != NULL) {
0d48d939 295 struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type);
1da177e4
LT		 296 if (nskb) {
297 kfree_skb(skb);
298 return nskb;
299 } else {
300 skb_queue_head(&bcsp->unrel, skb);
301 BT_ERR("Could not dequeue pkt because alloc_skb failed");
302 }
303 }
304
305 /* Now, try to send a reliable pkt. We can only send a
306 reliable packet if the number of packets sent but not yet ack'ed
307 is < than the winsize */
308
f89d75f2 309 spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING);
1da177e4
LT		 310
311 if (bcsp->unack.qlen < BCSP_TXWINSIZE && (skb = skb_dequeue(&bcsp->rel)) != NULL) {
0d48d939 312 struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type);
1da177e4
LT		 313 if (nskb) {
314 __skb_queue_tail(&bcsp->unack, skb);
315 mod_timer(&bcsp->tbcsp, jiffies + HZ / 4);
316 spin_unlock_irqrestore(&bcsp->unack.lock, flags);
317 return nskb;
318 } else {
319 skb_queue_head(&bcsp->rel, skb);
320 BT_ERR("Could not dequeue pkt because alloc_skb failed");
321 }
322 }
323
324 spin_unlock_irqrestore(&bcsp->unack.lock, flags);
325
1da177e4
LT		 326 /* We could not send a reliable packet, either because there are
327 none or because there are too many unack'ed pkts. Did we receive
328 any packets we have not acknowledged yet ? */
329
330 if (bcsp->txack_req) {
331 /* if so, craft an empty ACK pkt and send it on BCSP unreliable
332 channel 0 */
333 struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT);
334 return nskb;
335 }
336
337 /* We have nothing to send */
338 return NULL;
339}
340
341static int bcsp_flush(struct hci_uart *hu)
342{
343 BT_DBG("hu %p", hu);
344 return 0;
345}
346
347/* Remove ack'ed packets */
348static void bcsp_pkt_cull(struct bcsp_struct *bcsp)
349{
8fc5387c 350 struct sk_buff *skb, *tmp;
1da177e4 351 unsigned long flags;
1da177e4
LT		 352 int i, pkts_to_be_removed;
353 u8 seqno;
354
355 spin_lock_irqsave(&bcsp->unack.lock, flags);
356
8fc5387c 357 pkts_to_be_removed = skb_queue_len(&bcsp->unack);
1da177e4
LT		 358 seqno = bcsp->msgq_txseq;
359
360 while (pkts_to_be_removed) {
361 if (bcsp->rxack == seqno)
362 break;
363 pkts_to_be_removed--;
364 seqno = (seqno - 1) & 0x07;
365 }
366
367 if (bcsp->rxack != seqno)
368 BT_ERR("Peer acked invalid packet");
369
370 BT_DBG("Removing %u pkts out of %u, up to seqno %u",
8fc5387c
DM		 371 pkts_to_be_removed, skb_queue_len(&bcsp->unack),
372 (seqno - 1) & 0x07);
1da177e4 373
8fc5387c
DM		 374 i = 0;
375 skb_queue_walk_safe(&bcsp->unack, skb, tmp) {
d2e353f7 376 if (i >= pkts_to_be_removed)
8fc5387c 377 break;
d2e353f7 378 i++;
1da177e4 379
1da177e4
LT		 380 __skb_unlink(skb, &bcsp->unack);
381 kfree_skb(skb);
1da177e4 382 }
0372a662 383
8fc5387c 384 if (skb_queue_empty(&bcsp->unack))
1da177e4 385 del_timer(&bcsp->tbcsp);
0372a662 386
1da177e4
LT		 387 spin_unlock_irqrestore(&bcsp->unack.lock, flags);
388
389 if (i != pkts_to_be_removed)
390 BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed);
391}
392
393/* Handle BCSP link-establishment packets. When we
394 detect a "sync" packet, symptom that the BT module has reset,
395 we do nothing :) (yet) */
396static void bcsp_handle_le_pkt(struct hci_uart *hu)
397{
398 struct bcsp_struct *bcsp = hu->priv;
399 u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed };
400 u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 };
401 u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed };
402
403 /* spot "conf" pkts and reply with a "conf rsp" pkt */
404 if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 &&
405 !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) {
406 struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
407
408 BT_DBG("Found a LE conf pkt");
409 if (!nskb)
410 return;
411 memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4);
0d48d939 412 bt_cb(nskb)->pkt_type = BCSP_LE_PKT;
1da177e4
LT		 413
414 skb_queue_head(&bcsp->unrel, nskb);
415 hci_uart_tx_wakeup(hu);
416 }
417 /* Spot "sync" pkts. If we find one...disaster! */
418 else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 &&
419 !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) {
420 BT_ERR("Found a LE sync pkt, card has reset");
421 }
422}
423
424static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte)
425{
426 const u8 c0 = 0xc0, db = 0xdb;
427
428 switch (bcsp->rx_esc_state) {
429 case BCSP_ESCSTATE_NOESC:
430 switch (byte) {
431 case 0xdb:
432 bcsp->rx_esc_state = BCSP_ESCSTATE_ESC;
433 break;
434 default:
435 memcpy(skb_put(bcsp->rx_skb, 1), &byte, 1);
436 if ((bcsp->rx_skb-> data[0] & 0x40) != 0 &&
437 bcsp->rx_state != BCSP_W4_CRC)
438 bcsp_crc_update(&bcsp->message_crc, byte);
439 bcsp->rx_count--;
440 }
441 break;
442
443 case BCSP_ESCSTATE_ESC:
444 switch (byte) {
445 case 0xdc:
446 memcpy(skb_put(bcsp->rx_skb, 1), &c0, 1);
447 if ((bcsp->rx_skb-> data[0] & 0x40) != 0 &&
448 bcsp->rx_state != BCSP_W4_CRC)
449 bcsp_crc_update(&bcsp-> message_crc, 0xc0);
450 bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
451 bcsp->rx_count--;
452 break;
453
454 case 0xdd:
455 memcpy(skb_put(bcsp->rx_skb, 1), &db, 1);
456 if ((bcsp->rx_skb-> data[0] & 0x40) != 0 &&
457 bcsp->rx_state != BCSP_W4_CRC)
458 bcsp_crc_update(&bcsp-> message_crc, 0xdb);
459 bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
460 bcsp->rx_count--;
461 break;
462
463 default:
464 BT_ERR ("Invalid byte %02x after esc byte", byte);
465 kfree_skb(bcsp->rx_skb);
466 bcsp->rx_skb = NULL;
467 bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
468 bcsp->rx_count = 0;
469 }
470 }
471}
472
858119e1 473static void bcsp_complete_rx_pkt(struct hci_uart *hu)
1da177e4
LT		 474{
475 struct bcsp_struct *bcsp = hu->priv;
476 int pass_up;
477
478 if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */
479 BT_DBG("Received seqno %u from card", bcsp->rxseq_txack);
480 bcsp->rxseq_txack++;
481 bcsp->rxseq_txack %= 0x8;
482 bcsp->txack_req = 1;
483
484 /* If needed, transmit an ack pkt */
485 hci_uart_tx_wakeup(hu);
486 }
487
488 bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07;
489 BT_DBG("Request for pkt %u from card", bcsp->rxack);
490
491 bcsp_pkt_cull(bcsp);
492 if ((bcsp->rx_skb->data[1] & 0x0f) == 6 &&
493 bcsp->rx_skb->data[0] & 0x80) {
0d48d939 494 bt_cb(bcsp->rx_skb)->pkt_type = HCI_ACLDATA_PKT;
1da177e4
LT		 495 pass_up = 1;
496 } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 &&
497 bcsp->rx_skb->data[0] & 0x80) {
0d48d939 498 bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT;
1da177e4
LT		 499 pass_up = 1;
500 } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) {
0d48d939 501 bt_cb(bcsp->rx_skb)->pkt_type = HCI_SCODATA_PKT;
1da177e4
LT		 502 pass_up = 1;
503 } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 &&
504 !(bcsp->rx_skb->data[0] & 0x80)) {
505 bcsp_handle_le_pkt(hu);
506 pass_up = 0;
507 } else
508 pass_up = 0;
509
510 if (!pass_up) {
511 struct hci_event_hdr hdr;
512 u8 desc = (bcsp->rx_skb->data[1] & 0x0f);
513
514 if (desc != 0 && desc != 1) {
515 if (hciextn) {
516 desc |= 0xc0;
517 skb_pull(bcsp->rx_skb, 4);
518 memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1);
519
520 hdr.evt = 0xff;
521 hdr.plen = bcsp->rx_skb->len;
522 memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE);
0d48d939 523 bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT;
1da177e4
LT		 524
525 hci_recv_frame(bcsp->rx_skb);
526 } else {
527 BT_ERR ("Packet for unknown channel (%u %s)",
528 bcsp->rx_skb->data[1] & 0x0f,
529 bcsp->rx_skb->data[0] & 0x80 ?
530 "reliable" : "unreliable");
531 kfree_skb(bcsp->rx_skb);
532 }
533 } else
534 kfree_skb(bcsp->rx_skb);
535 } else {
536 /* Pull out BCSP hdr */
537 skb_pull(bcsp->rx_skb, 4);
538
539 hci_recv_frame(bcsp->rx_skb);
540 }
0372a662 541
1da177e4
LT		 542 bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
543 bcsp->rx_skb = NULL;
544}
545
c5ec5140
HH		 546static u16 bscp_get_crc(struct bcsp_struct *bcsp)
547{
548 return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]);
549}
550
1da177e4
LT		 551/* Recv data */
552static int bcsp_recv(struct hci_uart *hu, void *data, int count)
553{
554 struct bcsp_struct *bcsp = hu->priv;
fc5fef61 555 unsigned char *ptr;
1da177e4
LT		 556
557 BT_DBG("hu %p count %d rx_state %d rx_count %ld",
558 hu, count, bcsp->rx_state, bcsp->rx_count);
559
560 ptr = data;
561 while (count) {
562 if (bcsp->rx_count) {
563 if (*ptr == 0xc0) {
564 BT_ERR("Short BCSP packet");
565 kfree_skb(bcsp->rx_skb);
566 bcsp->rx_state = BCSP_W4_PKT_START;
567 bcsp->rx_count = 0;
568 } else
569 bcsp_unslip_one_byte(bcsp, *ptr);
570
571 ptr++; count--;
572 continue;
573 }
574
575 switch (bcsp->rx_state) {
576 case BCSP_W4_BCSP_HDR:
577 if ((0xff & (u8) ~ (bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] +
578 bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) {
579 BT_ERR("Error in BCSP hdr checksum");
580 kfree_skb(bcsp->rx_skb);
581 bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
582 bcsp->rx_count = 0;
583 continue;
584 }
585 if (bcsp->rx_skb->data[0] & 0x80 /* reliable pkt */
586 && (bcsp->rx_skb->data[0] & 0x07) != bcsp->rxseq_txack) {
587 BT_ERR ("Out-of-order packet arrived, got %u expected %u",
588 bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack);
589
590 kfree_skb(bcsp->rx_skb);
591 bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
592 bcsp->rx_count = 0;
593 continue;
594 }
595 bcsp->rx_state = BCSP_W4_DATA;
596 bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) +
597 (bcsp->rx_skb->data[2] << 4); /* May be 0 */
598 continue;
599
600 case BCSP_W4_DATA:
601 if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */
602 bcsp->rx_state = BCSP_W4_CRC;
603 bcsp->rx_count = 2;
604 } else
605 bcsp_complete_rx_pkt(hu);
606 continue;
607
608 case BCSP_W4_CRC:
c5ec5140 609 if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) {
1da177e4 610 BT_ERR ("Checksum failed: computed %04x received %04x",
c5ec5140
HH		 611 bitrev16(bcsp->message_crc),
612 bscp_get_crc(bcsp));
1da177e4
LT		 613
614 kfree_skb(bcsp->rx_skb);
615 bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
616 bcsp->rx_count = 0;
617 continue;
618 }
619 skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2);
620 bcsp_complete_rx_pkt(hu);
621 continue;
622
623 case BCSP_W4_PKT_DELIMITER:
624 switch (*ptr) {
625 case 0xc0:
626 bcsp->rx_state = BCSP_W4_PKT_START;
627 break;
628 default:
629 /*BT_ERR("Ignoring byte %02x", *ptr);*/
630 break;
631 }
632 ptr++; count--;
633 break;
634
635 case BCSP_W4_PKT_START:
636 switch (*ptr) {
637 case 0xc0:
638 ptr++; count--;
639 break;
640
641 default:
642 bcsp->rx_state = BCSP_W4_BCSP_HDR;
643 bcsp->rx_count = 4;
644 bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
645 BCSP_CRC_INIT(bcsp->message_crc);
0372a662 646
1da177e4
LT		 647 /* Do not increment ptr or decrement count
648 * Allocate packet. Max len of a BCSP pkt=
649 * 0xFFF (payload) +4 (header) +2 (crc) */
650
651 bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC);
652 if (!bcsp->rx_skb) {
653 BT_ERR("Can't allocate mem for new packet");
654 bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
655 bcsp->rx_count = 0;
656 return 0;
657 }
658 bcsp->rx_skb->dev = (void *) hu->hdev;
659 break;
660 }
661 break;
662 }
663 }
664 return count;
665}
666
667 /* Arrange to retransmit all messages in the relq. */
668static void bcsp_timed_event(unsigned long arg)
669{
670 struct hci_uart *hu = (struct hci_uart *) arg;
671 struct bcsp_struct *bcsp = hu->priv;
672 struct sk_buff *skb;
673 unsigned long flags;
674
675 BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen);
676
f89d75f2 677 spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING);
1da177e4
LT		 678
679 while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) {
680 bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07;
681 skb_queue_head(&bcsp->rel, skb);
682 }
683
684 spin_unlock_irqrestore(&bcsp->unack.lock, flags);
685
686 hci_uart_tx_wakeup(hu);
687}
688
689static int bcsp_open(struct hci_uart *hu)
690{
691 struct bcsp_struct *bcsp;
692
693 BT_DBG("hu %p", hu);
694
c063af34 695 bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL);
1da177e4
LT		 696 if (!bcsp)
697 return -ENOMEM;
1da177e4
LT		 698
699 hu->priv = bcsp;
700 skb_queue_head_init(&bcsp->unack);
701 skb_queue_head_init(&bcsp->rel);
702 skb_queue_head_init(&bcsp->unrel);
703
704 init_timer(&bcsp->tbcsp);
705 bcsp->tbcsp.function = bcsp_timed_event;
706 bcsp->tbcsp.data = (u_long) hu;
707
708 bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
709
20dd6f59
MH		 710 if (txcrc)
711 bcsp->use_crc = 1;
712
1da177e4
LT		 713 return 0;
714}
715
716static int bcsp_close(struct hci_uart *hu)
717{
718 struct bcsp_struct *bcsp = hu->priv;
719 hu->priv = NULL;
720
721 BT_DBG("hu %p", hu);
722
723 skb_queue_purge(&bcsp->unack);
724 skb_queue_purge(&bcsp->rel);
725 skb_queue_purge(&bcsp->unrel);
726 del_timer(&bcsp->tbcsp);
727
728 kfree(bcsp);
729 return 0;
730}
731
732static struct hci_uart_proto bcsp = {
0372a662
MH		 733 .id = HCI_UART_BCSP,
734 .open = bcsp_open,
735 .close = bcsp_close,
736 .enqueue = bcsp_enqueue,
737 .dequeue = bcsp_dequeue,
738 .recv = bcsp_recv,
739 .flush = bcsp_flush
1da177e4
LT		 740};
741
f2b94bb9 742int __init bcsp_init(void)
1da177e4
LT		 743{
744 int err = hci_uart_register_proto(&bcsp);
0372a662 745
1da177e4
LT		 746 if (!err)
747 BT_INFO("HCI BCSP protocol initialized");
748 else
749 BT_ERR("HCI BCSP protocol registration failed");
750
751 return err;
752}
753
f2b94bb9 754int __exit bcsp_deinit(void)
1da177e4
LT		 755{
756 return hci_uart_unregister_proto(&bcsp);
757}
758
20dd6f59
MH		 759module_param(txcrc, bool, 0644);
760MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet");
761
1da177e4
LT		 762module_param(hciextn, bool, 0644);
763MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets");
kernel source for telekom puls (alcatel/mediatek)