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1 | /* |
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 | * |
23 | */ |
24 | |
25 | #include <linux/module.h> |
26 | |
27 | #include <linux/kernel.h> |
28 | #include <linux/init.h> |
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> |
42 | #include <linux/bitrev.h> |
43 | #include <asm/unaligned.h> |
44 | |
45 | #include <net/bluetooth/bluetooth.h> |
46 | #include <net/bluetooth/hci_core.h> |
47 | |
48 | #include "hci_uart.h" |
49 | |
50 | #define VERSION "0.3" |
51 | |
52 | static bool txcrc = 1; |
53 | static bool hciextn = 1; |
54 | |
55 | #define BCSP_TXWINSIZE 4 |
56 | |
57 | #define BCSP_ACK_PKT 0x05 |
58 | #define BCSP_LE_PKT 0x06 |
59 | |
60 | struct 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 | |
92 | /* ---- BCSP CRC calculation ---- */ |
93 | |
94 | /* Table for calculating CRC for polynomial 0x1021, LSB processed first, |
95 | initial value 0xffff, bits shifted in reverse order. */ |
96 | |
97 | static 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 | */ |
114 | static 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 | |
124 | /* ---- BCSP core ---- */ |
125 | |
126 | static void bcsp_slip_msgdelim(struct sk_buff *skb) |
127 | { |
128 | const char pkt_delim = 0xc0; |
129 | |
130 | memcpy(skb_put(skb, 1), &pkt_delim, 1); |
131 | } |
132 | |
133 | static 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 | |
150 | static 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 | |
160 | switch (bt_cb(skb)->pkt_type) { |
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 | |
179 | static 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; |
184 | u16 BCSP_CRC_INIT(bcsp_txmsg_crc); |
185 | int rel, i; |
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) { |
214 | __le16 opcode = ((struct hci_command_hdr *)data)->opcode; |
215 | |
216 | /* Vendor specific commands */ |
217 | if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) { |
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 | |
236 | bt_cb(nskb)->pkt_type = pkt_type; |
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); |
247 | bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07; |
248 | } |
249 | |
250 | if (bcsp->use_crc) |
251 | hdr[0] |= 0x40; |
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]); |
260 | |
261 | if (bcsp->use_crc) |
262 | bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); |
263 | } |
264 | |
265 | /* Put payload */ |
266 | for (i = 0; i < len; i++) { |
267 | bcsp_slip_one_byte(nskb, data[i]); |
268 | |
269 | if (bcsp->use_crc) |
270 | bcsp_crc_update(&bcsp_txmsg_crc, data[i]); |
271 | } |
272 | |
273 | /* Put CRC */ |
274 | if (bcsp->use_crc) { |
275 | bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc); |
276 | bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff)); |
277 | bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff)); |
278 | } |
279 | |
280 | bcsp_slip_msgdelim(nskb); |
281 | return nskb; |
282 | } |
283 | |
284 | /* This is a rewrite of pkt_avail in ABCSP */ |
285 | static 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) { |
295 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type); |
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 | |
309 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
310 | |
311 | if (bcsp->unack.qlen < BCSP_TXWINSIZE && (skb = skb_dequeue(&bcsp->rel)) != NULL) { |
312 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type); |
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 | |
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 | |
341 | static int bcsp_flush(struct hci_uart *hu) |
342 | { |
343 | BT_DBG("hu %p", hu); |
344 | return 0; |
345 | } |
346 | |
347 | /* Remove ack'ed packets */ |
348 | static void bcsp_pkt_cull(struct bcsp_struct *bcsp) |
349 | { |
350 | struct sk_buff *skb, *tmp; |
351 | unsigned long flags; |
352 | int i, pkts_to_be_removed; |
353 | u8 seqno; |
354 | |
355 | spin_lock_irqsave(&bcsp->unack.lock, flags); |
356 | |
357 | pkts_to_be_removed = skb_queue_len(&bcsp->unack); |
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", |
371 | pkts_to_be_removed, skb_queue_len(&bcsp->unack), |
372 | (seqno - 1) & 0x07); |
373 | |
374 | i = 0; |
375 | skb_queue_walk_safe(&bcsp->unack, skb, tmp) { |
376 | if (i >= pkts_to_be_removed) |
377 | break; |
378 | i++; |
379 | |
380 | __skb_unlink(skb, &bcsp->unack); |
381 | kfree_skb(skb); |
382 | } |
383 | |
384 | if (skb_queue_empty(&bcsp->unack)) |
385 | del_timer(&bcsp->tbcsp); |
386 | |
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) */ |
396 | static 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); |
412 | bt_cb(nskb)->pkt_type = BCSP_LE_PKT; |
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 | |
424 | static 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 | |
473 | static void bcsp_complete_rx_pkt(struct hci_uart *hu) |
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) { |
494 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_ACLDATA_PKT; |
495 | pass_up = 1; |
496 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && |
497 | bcsp->rx_skb->data[0] & 0x80) { |
498 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
499 | pass_up = 1; |
500 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { |
501 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_SCODATA_PKT; |
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); |
523 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
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 | } |
541 | |
542 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
543 | bcsp->rx_skb = NULL; |
544 | } |
545 | |
546 | static 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 | |
551 | /* Recv data */ |
552 | static int bcsp_recv(struct hci_uart *hu, void *data, int count) |
553 | { |
554 | struct bcsp_struct *bcsp = hu->priv; |
555 | unsigned char *ptr; |
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: |
609 | if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) { |
610 | BT_ERR ("Checksum failed: computed %04x received %04x", |
611 | bitrev16(bcsp->message_crc), |
612 | bscp_get_crc(bcsp)); |
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); |
646 | |
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. */ |
668 | static 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 | |
677 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
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 | |
689 | static int bcsp_open(struct hci_uart *hu) |
690 | { |
691 | struct bcsp_struct *bcsp; |
692 | |
693 | BT_DBG("hu %p", hu); |
694 | |
695 | bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL); |
696 | if (!bcsp) |
697 | return -ENOMEM; |
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 | |
710 | if (txcrc) |
711 | bcsp->use_crc = 1; |
712 | |
713 | return 0; |
714 | } |
715 | |
716 | static 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 | |
732 | static struct hci_uart_proto bcsp = { |
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 |
740 | }; |
741 | |
742 | int __init bcsp_init(void) |
743 | { |
744 | int err = hci_uart_register_proto(&bcsp); |
745 | |
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 | |
754 | int __exit bcsp_deinit(void) |
755 | { |
756 | return hci_uart_unregister_proto(&bcsp); |
757 | } |
758 | |
759 | module_param(txcrc, bool, 0644); |
760 | MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet"); |
761 | |
762 | module_param(hciextn, bool, 0644); |
763 | MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets"); |
764 |
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