Commit | Line | Data |
---|---|---|
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 | |
bff6b89f SV |
50 | static bool txcrc = true; |
51 | static bool hciextn = true; | |
1da177e4 | 52 | |
0372a662 MH |
53 | #define BCSP_TXWINSIZE 4 |
54 | ||
55 | #define BCSP_ACK_PKT 0x05 | |
56 | #define BCSP_LE_PKT 0x06 | |
57 | ||
58 | struct bcsp_struct { | |
59 | struct sk_buff_head unack; /* Unack'ed packets queue */ | |
60 | struct sk_buff_head rel; /* Reliable packets queue */ | |
61 | struct sk_buff_head unrel; /* Unreliable packets queue */ | |
62 | ||
63 | unsigned long rx_count; | |
64 | struct sk_buff *rx_skb; | |
65 | u8 rxseq_txack; /* rxseq == txack. */ | |
66 | u8 rxack; /* Last packet sent by us that the peer ack'ed */ | |
67 | struct timer_list tbcsp; | |
68 | ||
69 | enum { | |
70 | BCSP_W4_PKT_DELIMITER, | |
71 | BCSP_W4_PKT_START, | |
72 | BCSP_W4_BCSP_HDR, | |
73 | BCSP_W4_DATA, | |
74 | BCSP_W4_CRC | |
75 | } rx_state; | |
76 | ||
77 | enum { | |
78 | BCSP_ESCSTATE_NOESC, | |
79 | BCSP_ESCSTATE_ESC | |
80 | } rx_esc_state; | |
81 | ||
82 | u8 use_crc; | |
83 | u16 message_crc; | |
84 | u8 txack_req; /* Do we need to send ack's to the peer? */ | |
85 | ||
86 | /* Reliable packet sequence number - used to assign seq to each rel pkt. */ | |
87 | u8 msgq_txseq; | |
88 | }; | |
89 | ||
1da177e4 LT |
90 | /* ---- BCSP CRC calculation ---- */ |
91 | ||
92 | /* Table for calculating CRC for polynomial 0x1021, LSB processed first, | |
93 | initial value 0xffff, bits shifted in reverse order. */ | |
94 | ||
95 | static const u16 crc_table[] = { | |
96 | 0x0000, 0x1081, 0x2102, 0x3183, | |
97 | 0x4204, 0x5285, 0x6306, 0x7387, | |
98 | 0x8408, 0x9489, 0xa50a, 0xb58b, | |
99 | 0xc60c, 0xd68d, 0xe70e, 0xf78f | |
100 | }; | |
101 | ||
102 | /* Initialise the crc calculator */ | |
103 | #define BCSP_CRC_INIT(x) x = 0xffff | |
104 | ||
105 | /* | |
106 | Update crc with next data byte | |
107 | ||
108 | Implementation note | |
109 | The data byte is treated as two nibbles. The crc is generated | |
110 | in reverse, i.e., bits are fed into the register from the top. | |
111 | */ | |
112 | static void bcsp_crc_update(u16 *crc, u8 d) | |
113 | { | |
114 | u16 reg = *crc; | |
115 | ||
116 | reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f]; | |
117 | reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f]; | |
118 | ||
119 | *crc = reg; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | /* ---- BCSP core ---- */ |
123 | ||
124 | static void bcsp_slip_msgdelim(struct sk_buff *skb) | |
125 | { | |
126 | const char pkt_delim = 0xc0; | |
0372a662 | 127 | |
1da177e4 LT |
128 | memcpy(skb_put(skb, 1), &pkt_delim, 1); |
129 | } | |
130 | ||
131 | static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c) | |
132 | { | |
133 | const char esc_c0[2] = { 0xdb, 0xdc }; | |
134 | const char esc_db[2] = { 0xdb, 0xdd }; | |
135 | ||
136 | switch (c) { | |
137 | case 0xc0: | |
138 | memcpy(skb_put(skb, 2), &esc_c0, 2); | |
139 | break; | |
140 | case 0xdb: | |
141 | memcpy(skb_put(skb, 2), &esc_db, 2); | |
142 | break; | |
143 | default: | |
144 | memcpy(skb_put(skb, 1), &c, 1); | |
145 | } | |
146 | } | |
147 | ||
148 | static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
149 | { | |
150 | struct bcsp_struct *bcsp = hu->priv; | |
151 | ||
152 | if (skb->len > 0xFFF) { | |
153 | BT_ERR("Packet too long"); | |
154 | kfree_skb(skb); | |
155 | return 0; | |
156 | } | |
157 | ||
0d48d939 | 158 | switch (bt_cb(skb)->pkt_type) { |
1da177e4 LT |
159 | case HCI_ACLDATA_PKT: |
160 | case HCI_COMMAND_PKT: | |
161 | skb_queue_tail(&bcsp->rel, skb); | |
162 | break; | |
163 | ||
164 | case HCI_SCODATA_PKT: | |
165 | skb_queue_tail(&bcsp->unrel, skb); | |
166 | break; | |
167 | ||
168 | default: | |
169 | BT_ERR("Unknown packet type"); | |
170 | kfree_skb(skb); | |
171 | break; | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, | |
178 | int len, int pkt_type) | |
179 | { | |
180 | struct sk_buff *nskb; | |
181 | u8 hdr[4], chan; | |
1da177e4 | 182 | u16 BCSP_CRC_INIT(bcsp_txmsg_crc); |
20dd6f59 | 183 | int rel, i; |
1da177e4 LT |
184 | |
185 | switch (pkt_type) { | |
186 | case HCI_ACLDATA_PKT: | |
187 | chan = 6; /* BCSP ACL channel */ | |
188 | rel = 1; /* reliable channel */ | |
189 | break; | |
190 | case HCI_COMMAND_PKT: | |
191 | chan = 5; /* BCSP cmd/evt channel */ | |
192 | rel = 1; /* reliable channel */ | |
193 | break; | |
194 | case HCI_SCODATA_PKT: | |
195 | chan = 7; /* BCSP SCO channel */ | |
196 | rel = 0; /* unreliable channel */ | |
197 | break; | |
198 | case BCSP_LE_PKT: | |
199 | chan = 1; /* BCSP LE channel */ | |
200 | rel = 0; /* unreliable channel */ | |
201 | break; | |
202 | case BCSP_ACK_PKT: | |
203 | chan = 0; /* BCSP internal channel */ | |
204 | rel = 0; /* unreliable channel */ | |
205 | break; | |
206 | default: | |
207 | BT_ERR("Unknown packet type"); | |
208 | return NULL; | |
209 | } | |
210 | ||
211 | if (hciextn && chan == 5) { | |
c5ec5140 | 212 | __le16 opcode = ((struct hci_command_hdr *)data)->opcode; |
1da177e4 | 213 | |
a9de9248 | 214 | /* Vendor specific commands */ |
c5ec5140 | 215 | if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) { |
1da177e4 LT |
216 | u8 desc = *(data + HCI_COMMAND_HDR_SIZE); |
217 | if ((desc & 0xf0) == 0xc0) { | |
218 | data += HCI_COMMAND_HDR_SIZE + 1; | |
219 | len -= HCI_COMMAND_HDR_SIZE + 1; | |
220 | chan = desc & 0x0f; | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
225 | /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2 | |
226 | (because bytes 0xc0 and 0xdb are escaped, worst case is | |
227 | when the packet is all made of 0xc0 and 0xdb :) ) | |
228 | + 2 (0xc0 delimiters at start and end). */ | |
229 | ||
230 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); | |
231 | if (!nskb) | |
232 | return NULL; | |
233 | ||
0d48d939 | 234 | bt_cb(nskb)->pkt_type = pkt_type; |
1da177e4 LT |
235 | |
236 | bcsp_slip_msgdelim(nskb); | |
237 | ||
238 | hdr[0] = bcsp->rxseq_txack << 3; | |
239 | bcsp->txack_req = 0; | |
240 | BT_DBG("We request packet no %u to card", bcsp->rxseq_txack); | |
241 | ||
242 | if (rel) { | |
243 | hdr[0] |= 0x80 + bcsp->msgq_txseq; | |
244 | BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq); | |
dd1589a4 | 245 | bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07; |
1da177e4 | 246 | } |
20dd6f59 MH |
247 | |
248 | if (bcsp->use_crc) | |
249 | hdr[0] |= 0x40; | |
1da177e4 LT |
250 | |
251 | hdr[1] = ((len << 4) & 0xff) | chan; | |
252 | hdr[2] = len >> 4; | |
253 | hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]); | |
254 | ||
255 | /* Put BCSP header */ | |
256 | for (i = 0; i < 4; i++) { | |
257 | bcsp_slip_one_byte(nskb, hdr[i]); | |
20dd6f59 MH |
258 | |
259 | if (bcsp->use_crc) | |
260 | bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); | |
1da177e4 LT |
261 | } |
262 | ||
263 | /* Put payload */ | |
264 | for (i = 0; i < len; i++) { | |
265 | bcsp_slip_one_byte(nskb, data[i]); | |
20dd6f59 MH |
266 | |
267 | if (bcsp->use_crc) | |
268 | bcsp_crc_update(&bcsp_txmsg_crc, data[i]); | |
1da177e4 LT |
269 | } |
270 | ||
1da177e4 | 271 | /* Put CRC */ |
20dd6f59 | 272 | if (bcsp->use_crc) { |
c5ec5140 | 273 | bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc); |
20dd6f59 MH |
274 | bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff)); |
275 | bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff)); | |
276 | } | |
1da177e4 LT |
277 | |
278 | bcsp_slip_msgdelim(nskb); | |
279 | return nskb; | |
280 | } | |
281 | ||
282 | /* This is a rewrite of pkt_avail in ABCSP */ | |
283 | static struct sk_buff *bcsp_dequeue(struct hci_uart *hu) | |
284 | { | |
285 | struct bcsp_struct *bcsp = hu->priv; | |
286 | unsigned long flags; | |
287 | struct sk_buff *skb; | |
288 | ||
289 | /* First of all, check for unreliable messages in the queue, | |
290 | since they have priority */ | |
291 | ||
a08b15e6 VI |
292 | skb = skb_dequeue(&bcsp->unrel); |
293 | if (skb != NULL) { | |
0d48d939 | 294 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type); |
1da177e4 LT |
295 | if (nskb) { |
296 | kfree_skb(skb); | |
297 | return nskb; | |
298 | } else { | |
299 | skb_queue_head(&bcsp->unrel, skb); | |
300 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
301 | } | |
302 | } | |
303 | ||
304 | /* Now, try to send a reliable pkt. We can only send a | |
305 | reliable packet if the number of packets sent but not yet ack'ed | |
306 | is < than the winsize */ | |
307 | ||
f89d75f2 | 308 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 | 309 | |
a08b15e6 VI |
310 | if (bcsp->unack.qlen < BCSP_TXWINSIZE) { |
311 | skb = skb_dequeue(&bcsp->rel); | |
312 | if (skb != NULL) { | |
313 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, | |
314 | bt_cb(skb)->pkt_type); | |
315 | if (nskb) { | |
316 | __skb_queue_tail(&bcsp->unack, skb); | |
317 | mod_timer(&bcsp->tbcsp, jiffies + HZ / 4); | |
318 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
319 | return nskb; | |
320 | } else { | |
321 | skb_queue_head(&bcsp->rel, skb); | |
322 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
323 | } | |
1da177e4 LT |
324 | } |
325 | } | |
326 | ||
327 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
328 | ||
1da177e4 LT |
329 | /* We could not send a reliable packet, either because there are |
330 | none or because there are too many unack'ed pkts. Did we receive | |
331 | any packets we have not acknowledged yet ? */ | |
332 | ||
333 | if (bcsp->txack_req) { | |
334 | /* if so, craft an empty ACK pkt and send it on BCSP unreliable | |
335 | channel 0 */ | |
336 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT); | |
337 | return nskb; | |
338 | } | |
339 | ||
340 | /* We have nothing to send */ | |
341 | return NULL; | |
342 | } | |
343 | ||
344 | static int bcsp_flush(struct hci_uart *hu) | |
345 | { | |
346 | BT_DBG("hu %p", hu); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | /* Remove ack'ed packets */ | |
351 | static void bcsp_pkt_cull(struct bcsp_struct *bcsp) | |
352 | { | |
8fc5387c | 353 | struct sk_buff *skb, *tmp; |
1da177e4 | 354 | unsigned long flags; |
1da177e4 LT |
355 | int i, pkts_to_be_removed; |
356 | u8 seqno; | |
357 | ||
358 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
359 | ||
8fc5387c | 360 | pkts_to_be_removed = skb_queue_len(&bcsp->unack); |
1da177e4 LT |
361 | seqno = bcsp->msgq_txseq; |
362 | ||
363 | while (pkts_to_be_removed) { | |
364 | if (bcsp->rxack == seqno) | |
365 | break; | |
366 | pkts_to_be_removed--; | |
367 | seqno = (seqno - 1) & 0x07; | |
368 | } | |
369 | ||
370 | if (bcsp->rxack != seqno) | |
371 | BT_ERR("Peer acked invalid packet"); | |
372 | ||
373 | BT_DBG("Removing %u pkts out of %u, up to seqno %u", | |
8fc5387c DM |
374 | pkts_to_be_removed, skb_queue_len(&bcsp->unack), |
375 | (seqno - 1) & 0x07); | |
1da177e4 | 376 | |
8fc5387c DM |
377 | i = 0; |
378 | skb_queue_walk_safe(&bcsp->unack, skb, tmp) { | |
d2e353f7 | 379 | if (i >= pkts_to_be_removed) |
8fc5387c | 380 | break; |
d2e353f7 | 381 | i++; |
1da177e4 | 382 | |
1da177e4 LT |
383 | __skb_unlink(skb, &bcsp->unack); |
384 | kfree_skb(skb); | |
1da177e4 | 385 | } |
0372a662 | 386 | |
8fc5387c | 387 | if (skb_queue_empty(&bcsp->unack)) |
1da177e4 | 388 | del_timer(&bcsp->tbcsp); |
0372a662 | 389 | |
1da177e4 LT |
390 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); |
391 | ||
392 | if (i != pkts_to_be_removed) | |
393 | BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed); | |
394 | } | |
395 | ||
396 | /* Handle BCSP link-establishment packets. When we | |
397 | detect a "sync" packet, symptom that the BT module has reset, | |
398 | we do nothing :) (yet) */ | |
399 | static void bcsp_handle_le_pkt(struct hci_uart *hu) | |
400 | { | |
401 | struct bcsp_struct *bcsp = hu->priv; | |
402 | u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed }; | |
403 | u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 }; | |
404 | u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed }; | |
405 | ||
406 | /* spot "conf" pkts and reply with a "conf rsp" pkt */ | |
407 | if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
408 | !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) { | |
409 | struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC); | |
410 | ||
411 | BT_DBG("Found a LE conf pkt"); | |
412 | if (!nskb) | |
413 | return; | |
414 | memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4); | |
0d48d939 | 415 | bt_cb(nskb)->pkt_type = BCSP_LE_PKT; |
1da177e4 LT |
416 | |
417 | skb_queue_head(&bcsp->unrel, nskb); | |
418 | hci_uart_tx_wakeup(hu); | |
419 | } | |
420 | /* Spot "sync" pkts. If we find one...disaster! */ | |
421 | else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
422 | !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) { | |
423 | BT_ERR("Found a LE sync pkt, card has reset"); | |
424 | } | |
425 | } | |
426 | ||
427 | static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte) | |
428 | { | |
429 | const u8 c0 = 0xc0, db = 0xdb; | |
430 | ||
431 | switch (bcsp->rx_esc_state) { | |
432 | case BCSP_ESCSTATE_NOESC: | |
433 | switch (byte) { | |
434 | case 0xdb: | |
435 | bcsp->rx_esc_state = BCSP_ESCSTATE_ESC; | |
436 | break; | |
437 | default: | |
438 | memcpy(skb_put(bcsp->rx_skb, 1), &byte, 1); | |
fe8de008 | 439 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
1da177e4 LT |
440 | bcsp->rx_state != BCSP_W4_CRC) |
441 | bcsp_crc_update(&bcsp->message_crc, byte); | |
442 | bcsp->rx_count--; | |
443 | } | |
444 | break; | |
445 | ||
446 | case BCSP_ESCSTATE_ESC: | |
447 | switch (byte) { | |
448 | case 0xdc: | |
449 | memcpy(skb_put(bcsp->rx_skb, 1), &c0, 1); | |
fe8de008 | 450 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
1da177e4 | 451 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 452 | bcsp_crc_update(&bcsp->message_crc, 0xc0); |
1da177e4 LT |
453 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
454 | bcsp->rx_count--; | |
455 | break; | |
456 | ||
457 | case 0xdd: | |
458 | memcpy(skb_put(bcsp->rx_skb, 1), &db, 1); | |
fe8de008 | 459 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
1da177e4 | 460 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 461 | bcsp_crc_update(&bcsp->message_crc, 0xdb); |
1da177e4 LT |
462 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
463 | bcsp->rx_count--; | |
464 | break; | |
465 | ||
466 | default: | |
fe8de008 | 467 | BT_ERR("Invalid byte %02x after esc byte", byte); |
1da177e4 LT |
468 | kfree_skb(bcsp->rx_skb); |
469 | bcsp->rx_skb = NULL; | |
470 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
471 | bcsp->rx_count = 0; | |
472 | } | |
473 | } | |
474 | } | |
475 | ||
858119e1 | 476 | static void bcsp_complete_rx_pkt(struct hci_uart *hu) |
1da177e4 LT |
477 | { |
478 | struct bcsp_struct *bcsp = hu->priv; | |
479 | int pass_up; | |
480 | ||
481 | if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */ | |
482 | BT_DBG("Received seqno %u from card", bcsp->rxseq_txack); | |
483 | bcsp->rxseq_txack++; | |
484 | bcsp->rxseq_txack %= 0x8; | |
485 | bcsp->txack_req = 1; | |
486 | ||
487 | /* If needed, transmit an ack pkt */ | |
488 | hci_uart_tx_wakeup(hu); | |
489 | } | |
490 | ||
491 | bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07; | |
492 | BT_DBG("Request for pkt %u from card", bcsp->rxack); | |
493 | ||
494 | bcsp_pkt_cull(bcsp); | |
495 | if ((bcsp->rx_skb->data[1] & 0x0f) == 6 && | |
496 | bcsp->rx_skb->data[0] & 0x80) { | |
0d48d939 | 497 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_ACLDATA_PKT; |
1da177e4 LT |
498 | pass_up = 1; |
499 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && | |
500 | bcsp->rx_skb->data[0] & 0x80) { | |
0d48d939 | 501 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
1da177e4 LT |
502 | pass_up = 1; |
503 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { | |
0d48d939 | 504 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_SCODATA_PKT; |
1da177e4 LT |
505 | pass_up = 1; |
506 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 && | |
507 | !(bcsp->rx_skb->data[0] & 0x80)) { | |
508 | bcsp_handle_le_pkt(hu); | |
509 | pass_up = 0; | |
510 | } else | |
511 | pass_up = 0; | |
512 | ||
513 | if (!pass_up) { | |
514 | struct hci_event_hdr hdr; | |
515 | u8 desc = (bcsp->rx_skb->data[1] & 0x0f); | |
516 | ||
517 | if (desc != 0 && desc != 1) { | |
518 | if (hciextn) { | |
519 | desc |= 0xc0; | |
520 | skb_pull(bcsp->rx_skb, 4); | |
521 | memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1); | |
522 | ||
523 | hdr.evt = 0xff; | |
524 | hdr.plen = bcsp->rx_skb->len; | |
525 | memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE); | |
0d48d939 | 526 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
1da177e4 | 527 | |
e1a26170 | 528 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
1da177e4 | 529 | } else { |
fe8de008 | 530 | BT_ERR("Packet for unknown channel (%u %s)", |
1da177e4 LT |
531 | bcsp->rx_skb->data[1] & 0x0f, |
532 | bcsp->rx_skb->data[0] & 0x80 ? | |
533 | "reliable" : "unreliable"); | |
534 | kfree_skb(bcsp->rx_skb); | |
535 | } | |
536 | } else | |
537 | kfree_skb(bcsp->rx_skb); | |
538 | } else { | |
539 | /* Pull out BCSP hdr */ | |
540 | skb_pull(bcsp->rx_skb, 4); | |
541 | ||
e1a26170 | 542 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
1da177e4 | 543 | } |
0372a662 | 544 | |
1da177e4 LT |
545 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
546 | bcsp->rx_skb = NULL; | |
547 | } | |
548 | ||
c5ec5140 HH |
549 | static u16 bscp_get_crc(struct bcsp_struct *bcsp) |
550 | { | |
551 | return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]); | |
552 | } | |
553 | ||
1da177e4 | 554 | /* Recv data */ |
9d1c40eb | 555 | static int bcsp_recv(struct hci_uart *hu, const void *data, int count) |
1da177e4 LT |
556 | { |
557 | struct bcsp_struct *bcsp = hu->priv; | |
9d1c40eb | 558 | const unsigned char *ptr; |
1da177e4 LT |
559 | |
560 | BT_DBG("hu %p count %d rx_state %d rx_count %ld", | |
561 | hu, count, bcsp->rx_state, bcsp->rx_count); | |
562 | ||
563 | ptr = data; | |
564 | while (count) { | |
565 | if (bcsp->rx_count) { | |
566 | if (*ptr == 0xc0) { | |
567 | BT_ERR("Short BCSP packet"); | |
568 | kfree_skb(bcsp->rx_skb); | |
569 | bcsp->rx_state = BCSP_W4_PKT_START; | |
570 | bcsp->rx_count = 0; | |
571 | } else | |
572 | bcsp_unslip_one_byte(bcsp, *ptr); | |
573 | ||
574 | ptr++; count--; | |
575 | continue; | |
576 | } | |
577 | ||
578 | switch (bcsp->rx_state) { | |
579 | case BCSP_W4_BCSP_HDR: | |
580 | if ((0xff & (u8) ~ (bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] + | |
581 | bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { | |
582 | BT_ERR("Error in BCSP hdr checksum"); | |
583 | kfree_skb(bcsp->rx_skb); | |
584 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
585 | bcsp->rx_count = 0; | |
586 | continue; | |
587 | } | |
588 | if (bcsp->rx_skb->data[0] & 0x80 /* reliable pkt */ | |
589 | && (bcsp->rx_skb->data[0] & 0x07) != bcsp->rxseq_txack) { | |
fe8de008 | 590 | BT_ERR("Out-of-order packet arrived, got %u expected %u", |
1da177e4 LT |
591 | bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack); |
592 | ||
593 | kfree_skb(bcsp->rx_skb); | |
594 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
595 | bcsp->rx_count = 0; | |
596 | continue; | |
597 | } | |
598 | bcsp->rx_state = BCSP_W4_DATA; | |
599 | bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) + | |
600 | (bcsp->rx_skb->data[2] << 4); /* May be 0 */ | |
601 | continue; | |
602 | ||
603 | case BCSP_W4_DATA: | |
604 | if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */ | |
605 | bcsp->rx_state = BCSP_W4_CRC; | |
606 | bcsp->rx_count = 2; | |
607 | } else | |
608 | bcsp_complete_rx_pkt(hu); | |
609 | continue; | |
610 | ||
611 | case BCSP_W4_CRC: | |
c5ec5140 | 612 | if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) { |
1da177e4 | 613 | BT_ERR ("Checksum failed: computed %04x received %04x", |
c5ec5140 HH |
614 | bitrev16(bcsp->message_crc), |
615 | bscp_get_crc(bcsp)); | |
1da177e4 LT |
616 | |
617 | kfree_skb(bcsp->rx_skb); | |
618 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
619 | bcsp->rx_count = 0; | |
620 | continue; | |
621 | } | |
622 | skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2); | |
623 | bcsp_complete_rx_pkt(hu); | |
624 | continue; | |
625 | ||
626 | case BCSP_W4_PKT_DELIMITER: | |
627 | switch (*ptr) { | |
628 | case 0xc0: | |
629 | bcsp->rx_state = BCSP_W4_PKT_START; | |
630 | break; | |
631 | default: | |
632 | /*BT_ERR("Ignoring byte %02x", *ptr);*/ | |
633 | break; | |
634 | } | |
635 | ptr++; count--; | |
636 | break; | |
637 | ||
638 | case BCSP_W4_PKT_START: | |
639 | switch (*ptr) { | |
640 | case 0xc0: | |
641 | ptr++; count--; | |
642 | break; | |
643 | ||
644 | default: | |
645 | bcsp->rx_state = BCSP_W4_BCSP_HDR; | |
646 | bcsp->rx_count = 4; | |
647 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
648 | BCSP_CRC_INIT(bcsp->message_crc); | |
0372a662 | 649 | |
1da177e4 LT |
650 | /* Do not increment ptr or decrement count |
651 | * Allocate packet. Max len of a BCSP pkt= | |
652 | * 0xFFF (payload) +4 (header) +2 (crc) */ | |
653 | ||
654 | bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC); | |
655 | if (!bcsp->rx_skb) { | |
656 | BT_ERR("Can't allocate mem for new packet"); | |
657 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
658 | bcsp->rx_count = 0; | |
659 | return 0; | |
660 | } | |
1da177e4 LT |
661 | break; |
662 | } | |
663 | break; | |
664 | } | |
665 | } | |
666 | return count; | |
667 | } | |
668 | ||
669 | /* Arrange to retransmit all messages in the relq. */ | |
670 | static void bcsp_timed_event(unsigned long arg) | |
671 | { | |
672 | struct hci_uart *hu = (struct hci_uart *) arg; | |
673 | struct bcsp_struct *bcsp = hu->priv; | |
674 | struct sk_buff *skb; | |
675 | unsigned long flags; | |
676 | ||
677 | BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen); | |
678 | ||
f89d75f2 | 679 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
680 | |
681 | while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) { | |
682 | bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07; | |
683 | skb_queue_head(&bcsp->rel, skb); | |
684 | } | |
685 | ||
686 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
687 | ||
688 | hci_uart_tx_wakeup(hu); | |
689 | } | |
690 | ||
691 | static int bcsp_open(struct hci_uart *hu) | |
692 | { | |
693 | struct bcsp_struct *bcsp; | |
694 | ||
695 | BT_DBG("hu %p", hu); | |
696 | ||
c063af34 | 697 | bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL); |
1da177e4 LT |
698 | if (!bcsp) |
699 | return -ENOMEM; | |
1da177e4 LT |
700 | |
701 | hu->priv = bcsp; | |
702 | skb_queue_head_init(&bcsp->unack); | |
703 | skb_queue_head_init(&bcsp->rel); | |
704 | skb_queue_head_init(&bcsp->unrel); | |
705 | ||
706 | init_timer(&bcsp->tbcsp); | |
707 | bcsp->tbcsp.function = bcsp_timed_event; | |
708 | bcsp->tbcsp.data = (u_long) hu; | |
709 | ||
710 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
711 | ||
20dd6f59 MH |
712 | if (txcrc) |
713 | bcsp->use_crc = 1; | |
714 | ||
1da177e4 LT |
715 | return 0; |
716 | } | |
717 | ||
718 | static int bcsp_close(struct hci_uart *hu) | |
719 | { | |
720 | struct bcsp_struct *bcsp = hu->priv; | |
c327cddd MK |
721 | |
722 | del_timer_sync(&bcsp->tbcsp); | |
723 | ||
1da177e4 LT |
724 | hu->priv = NULL; |
725 | ||
726 | BT_DBG("hu %p", hu); | |
727 | ||
728 | skb_queue_purge(&bcsp->unack); | |
729 | skb_queue_purge(&bcsp->rel); | |
730 | skb_queue_purge(&bcsp->unrel); | |
1da177e4 LT |
731 | |
732 | kfree(bcsp); | |
733 | return 0; | |
734 | } | |
735 | ||
4ee7ef19 | 736 | static const struct hci_uart_proto bcsp = { |
0372a662 | 737 | .id = HCI_UART_BCSP, |
7c40fb8d | 738 | .name = "BCSP", |
0372a662 MH |
739 | .open = bcsp_open, |
740 | .close = bcsp_close, | |
741 | .enqueue = bcsp_enqueue, | |
742 | .dequeue = bcsp_dequeue, | |
743 | .recv = bcsp_recv, | |
744 | .flush = bcsp_flush | |
1da177e4 LT |
745 | }; |
746 | ||
f2b94bb9 | 747 | int __init bcsp_init(void) |
1da177e4 | 748 | { |
01009eec | 749 | return hci_uart_register_proto(&bcsp); |
1da177e4 LT |
750 | } |
751 | ||
f2b94bb9 | 752 | int __exit bcsp_deinit(void) |
1da177e4 LT |
753 | { |
754 | return hci_uart_unregister_proto(&bcsp); | |
755 | } | |
756 | ||
20dd6f59 MH |
757 | module_param(txcrc, bool, 0644); |
758 | MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet"); | |
759 | ||
1da177e4 LT |
760 | module_param(hciextn, bool, 0644); |
761 | MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets"); |