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/config.h> |
26 | #include <linux/module.h> | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/fcntl.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/ptrace.h> | |
35 | #include <linux/poll.h> | |
36 | ||
37 | #include <linux/slab.h> | |
38 | #include <linux/tty.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/signal.h> | |
42 | #include <linux/ioctl.h> | |
43 | #include <linux/skbuff.h> | |
44 | ||
45 | #include <net/bluetooth/bluetooth.h> | |
46 | #include <net/bluetooth/hci_core.h> | |
0372a662 | 47 | |
1da177e4 | 48 | #include "hci_uart.h" |
1da177e4 LT |
49 | |
50 | #ifndef CONFIG_BT_HCIUART_DEBUG | |
51 | #undef BT_DBG | |
52 | #define BT_DBG( A... ) | |
1da177e4 LT |
53 | #endif |
54 | ||
0372a662 MH |
55 | #define VERSION "0.3" |
56 | ||
20dd6f59 | 57 | static int txcrc = 1; |
1da177e4 LT |
58 | static int hciextn = 1; |
59 | ||
0372a662 MH |
60 | #define BCSP_TXWINSIZE 4 |
61 | ||
62 | #define BCSP_ACK_PKT 0x05 | |
63 | #define BCSP_LE_PKT 0x06 | |
64 | ||
65 | struct bcsp_struct { | |
66 | struct sk_buff_head unack; /* Unack'ed packets queue */ | |
67 | struct sk_buff_head rel; /* Reliable packets queue */ | |
68 | struct sk_buff_head unrel; /* Unreliable packets queue */ | |
69 | ||
70 | unsigned long rx_count; | |
71 | struct sk_buff *rx_skb; | |
72 | u8 rxseq_txack; /* rxseq == txack. */ | |
73 | u8 rxack; /* Last packet sent by us that the peer ack'ed */ | |
74 | struct timer_list tbcsp; | |
75 | ||
76 | enum { | |
77 | BCSP_W4_PKT_DELIMITER, | |
78 | BCSP_W4_PKT_START, | |
79 | BCSP_W4_BCSP_HDR, | |
80 | BCSP_W4_DATA, | |
81 | BCSP_W4_CRC | |
82 | } rx_state; | |
83 | ||
84 | enum { | |
85 | BCSP_ESCSTATE_NOESC, | |
86 | BCSP_ESCSTATE_ESC | |
87 | } rx_esc_state; | |
88 | ||
89 | u8 use_crc; | |
90 | u16 message_crc; | |
91 | u8 txack_req; /* Do we need to send ack's to the peer? */ | |
92 | ||
93 | /* Reliable packet sequence number - used to assign seq to each rel pkt. */ | |
94 | u8 msgq_txseq; | |
95 | }; | |
96 | ||
1da177e4 LT |
97 | /* ---- BCSP CRC calculation ---- */ |
98 | ||
99 | /* Table for calculating CRC for polynomial 0x1021, LSB processed first, | |
100 | initial value 0xffff, bits shifted in reverse order. */ | |
101 | ||
102 | static const u16 crc_table[] = { | |
103 | 0x0000, 0x1081, 0x2102, 0x3183, | |
104 | 0x4204, 0x5285, 0x6306, 0x7387, | |
105 | 0x8408, 0x9489, 0xa50a, 0xb58b, | |
106 | 0xc60c, 0xd68d, 0xe70e, 0xf78f | |
107 | }; | |
108 | ||
109 | /* Initialise the crc calculator */ | |
110 | #define BCSP_CRC_INIT(x) x = 0xffff | |
111 | ||
112 | /* | |
113 | Update crc with next data byte | |
114 | ||
115 | Implementation note | |
116 | The data byte is treated as two nibbles. The crc is generated | |
117 | in reverse, i.e., bits are fed into the register from the top. | |
118 | */ | |
119 | static void bcsp_crc_update(u16 *crc, u8 d) | |
120 | { | |
121 | u16 reg = *crc; | |
122 | ||
123 | reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f]; | |
124 | reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f]; | |
125 | ||
126 | *crc = reg; | |
127 | } | |
128 | ||
129 | /* | |
130 | Get reverse of generated crc | |
131 | ||
132 | Implementation note | |
133 | The crc generator (bcsp_crc_init() and bcsp_crc_update()) | |
134 | creates a reversed crc, so it needs to be swapped back before | |
135 | being passed on. | |
136 | */ | |
137 | static u16 bcsp_crc_reverse(u16 crc) | |
138 | { | |
139 | u16 b, rev; | |
140 | ||
141 | for (b = 0, rev = 0; b < 16; b++) { | |
142 | rev = rev << 1; | |
143 | rev |= (crc & 1); | |
144 | crc = crc >> 1; | |
145 | } | |
0372a662 | 146 | |
1da177e4 LT |
147 | return (rev); |
148 | } | |
149 | ||
150 | /* ---- BCSP core ---- */ | |
151 | ||
152 | static void bcsp_slip_msgdelim(struct sk_buff *skb) | |
153 | { | |
154 | const char pkt_delim = 0xc0; | |
0372a662 | 155 | |
1da177e4 LT |
156 | memcpy(skb_put(skb, 1), &pkt_delim, 1); |
157 | } | |
158 | ||
159 | static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c) | |
160 | { | |
161 | const char esc_c0[2] = { 0xdb, 0xdc }; | |
162 | const char esc_db[2] = { 0xdb, 0xdd }; | |
163 | ||
164 | switch (c) { | |
165 | case 0xc0: | |
166 | memcpy(skb_put(skb, 2), &esc_c0, 2); | |
167 | break; | |
168 | case 0xdb: | |
169 | memcpy(skb_put(skb, 2), &esc_db, 2); | |
170 | break; | |
171 | default: | |
172 | memcpy(skb_put(skb, 1), &c, 1); | |
173 | } | |
174 | } | |
175 | ||
176 | static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
177 | { | |
178 | struct bcsp_struct *bcsp = hu->priv; | |
179 | ||
180 | if (skb->len > 0xFFF) { | |
181 | BT_ERR("Packet too long"); | |
182 | kfree_skb(skb); | |
183 | return 0; | |
184 | } | |
185 | ||
0d48d939 | 186 | switch (bt_cb(skb)->pkt_type) { |
1da177e4 LT |
187 | case HCI_ACLDATA_PKT: |
188 | case HCI_COMMAND_PKT: | |
189 | skb_queue_tail(&bcsp->rel, skb); | |
190 | break; | |
191 | ||
192 | case HCI_SCODATA_PKT: | |
193 | skb_queue_tail(&bcsp->unrel, skb); | |
194 | break; | |
195 | ||
196 | default: | |
197 | BT_ERR("Unknown packet type"); | |
198 | kfree_skb(skb); | |
199 | break; | |
200 | } | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, | |
206 | int len, int pkt_type) | |
207 | { | |
208 | struct sk_buff *nskb; | |
209 | u8 hdr[4], chan; | |
1da177e4 | 210 | u16 BCSP_CRC_INIT(bcsp_txmsg_crc); |
20dd6f59 | 211 | int rel, i; |
1da177e4 LT |
212 | |
213 | switch (pkt_type) { | |
214 | case HCI_ACLDATA_PKT: | |
215 | chan = 6; /* BCSP ACL channel */ | |
216 | rel = 1; /* reliable channel */ | |
217 | break; | |
218 | case HCI_COMMAND_PKT: | |
219 | chan = 5; /* BCSP cmd/evt channel */ | |
220 | rel = 1; /* reliable channel */ | |
221 | break; | |
222 | case HCI_SCODATA_PKT: | |
223 | chan = 7; /* BCSP SCO channel */ | |
224 | rel = 0; /* unreliable channel */ | |
225 | break; | |
226 | case BCSP_LE_PKT: | |
227 | chan = 1; /* BCSP LE channel */ | |
228 | rel = 0; /* unreliable channel */ | |
229 | break; | |
230 | case BCSP_ACK_PKT: | |
231 | chan = 0; /* BCSP internal channel */ | |
232 | rel = 0; /* unreliable channel */ | |
233 | break; | |
234 | default: | |
235 | BT_ERR("Unknown packet type"); | |
236 | return NULL; | |
237 | } | |
238 | ||
239 | if (hciextn && chan == 5) { | |
240 | struct hci_command_hdr *hdr = (struct hci_command_hdr *) data; | |
241 | ||
242 | if (hci_opcode_ogf(__le16_to_cpu(hdr->opcode)) == OGF_VENDOR_CMD) { | |
243 | u8 desc = *(data + HCI_COMMAND_HDR_SIZE); | |
244 | if ((desc & 0xf0) == 0xc0) { | |
245 | data += HCI_COMMAND_HDR_SIZE + 1; | |
246 | len -= HCI_COMMAND_HDR_SIZE + 1; | |
247 | chan = desc & 0x0f; | |
248 | } | |
249 | } | |
250 | } | |
251 | ||
252 | /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2 | |
253 | (because bytes 0xc0 and 0xdb are escaped, worst case is | |
254 | when the packet is all made of 0xc0 and 0xdb :) ) | |
255 | + 2 (0xc0 delimiters at start and end). */ | |
256 | ||
257 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); | |
258 | if (!nskb) | |
259 | return NULL; | |
260 | ||
0d48d939 | 261 | bt_cb(nskb)->pkt_type = pkt_type; |
1da177e4 LT |
262 | |
263 | bcsp_slip_msgdelim(nskb); | |
264 | ||
265 | hdr[0] = bcsp->rxseq_txack << 3; | |
266 | bcsp->txack_req = 0; | |
267 | BT_DBG("We request packet no %u to card", bcsp->rxseq_txack); | |
268 | ||
269 | if (rel) { | |
270 | hdr[0] |= 0x80 + bcsp->msgq_txseq; | |
271 | BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq); | |
272 | bcsp->msgq_txseq = ++(bcsp->msgq_txseq) & 0x07; | |
273 | } | |
20dd6f59 MH |
274 | |
275 | if (bcsp->use_crc) | |
276 | hdr[0] |= 0x40; | |
1da177e4 LT |
277 | |
278 | hdr[1] = ((len << 4) & 0xff) | chan; | |
279 | hdr[2] = len >> 4; | |
280 | hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]); | |
281 | ||
282 | /* Put BCSP header */ | |
283 | for (i = 0; i < 4; i++) { | |
284 | bcsp_slip_one_byte(nskb, hdr[i]); | |
20dd6f59 MH |
285 | |
286 | if (bcsp->use_crc) | |
287 | bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); | |
1da177e4 LT |
288 | } |
289 | ||
290 | /* Put payload */ | |
291 | for (i = 0; i < len; i++) { | |
292 | bcsp_slip_one_byte(nskb, data[i]); | |
20dd6f59 MH |
293 | |
294 | if (bcsp->use_crc) | |
295 | bcsp_crc_update(&bcsp_txmsg_crc, data[i]); | |
1da177e4 LT |
296 | } |
297 | ||
1da177e4 | 298 | /* Put CRC */ |
20dd6f59 MH |
299 | if (bcsp->use_crc) { |
300 | bcsp_txmsg_crc = bcsp_crc_reverse(bcsp_txmsg_crc); | |
301 | bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff)); | |
302 | bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff)); | |
303 | } | |
1da177e4 LT |
304 | |
305 | bcsp_slip_msgdelim(nskb); | |
306 | return nskb; | |
307 | } | |
308 | ||
309 | /* This is a rewrite of pkt_avail in ABCSP */ | |
310 | static struct sk_buff *bcsp_dequeue(struct hci_uart *hu) | |
311 | { | |
312 | struct bcsp_struct *bcsp = hu->priv; | |
313 | unsigned long flags; | |
314 | struct sk_buff *skb; | |
315 | ||
316 | /* First of all, check for unreliable messages in the queue, | |
317 | since they have priority */ | |
318 | ||
319 | if ((skb = skb_dequeue(&bcsp->unrel)) != NULL) { | |
0d48d939 | 320 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type); |
1da177e4 LT |
321 | if (nskb) { |
322 | kfree_skb(skb); | |
323 | return nskb; | |
324 | } else { | |
325 | skb_queue_head(&bcsp->unrel, skb); | |
326 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
327 | } | |
328 | } | |
329 | ||
330 | /* Now, try to send a reliable pkt. We can only send a | |
331 | reliable packet if the number of packets sent but not yet ack'ed | |
332 | is < than the winsize */ | |
333 | ||
334 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
335 | ||
336 | if (bcsp->unack.qlen < BCSP_TXWINSIZE && (skb = skb_dequeue(&bcsp->rel)) != NULL) { | |
0d48d939 | 337 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type); |
1da177e4 LT |
338 | if (nskb) { |
339 | __skb_queue_tail(&bcsp->unack, skb); | |
340 | mod_timer(&bcsp->tbcsp, jiffies + HZ / 4); | |
341 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
342 | return nskb; | |
343 | } else { | |
344 | skb_queue_head(&bcsp->rel, skb); | |
345 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
346 | } | |
347 | } | |
348 | ||
349 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
350 | ||
1da177e4 LT |
351 | /* We could not send a reliable packet, either because there are |
352 | none or because there are too many unack'ed pkts. Did we receive | |
353 | any packets we have not acknowledged yet ? */ | |
354 | ||
355 | if (bcsp->txack_req) { | |
356 | /* if so, craft an empty ACK pkt and send it on BCSP unreliable | |
357 | channel 0 */ | |
358 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT); | |
359 | return nskb; | |
360 | } | |
361 | ||
362 | /* We have nothing to send */ | |
363 | return NULL; | |
364 | } | |
365 | ||
366 | static int bcsp_flush(struct hci_uart *hu) | |
367 | { | |
368 | BT_DBG("hu %p", hu); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | /* Remove ack'ed packets */ | |
373 | static void bcsp_pkt_cull(struct bcsp_struct *bcsp) | |
374 | { | |
375 | unsigned long flags; | |
376 | struct sk_buff *skb; | |
377 | int i, pkts_to_be_removed; | |
378 | u8 seqno; | |
379 | ||
380 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
381 | ||
382 | pkts_to_be_removed = bcsp->unack.qlen; | |
383 | seqno = bcsp->msgq_txseq; | |
384 | ||
385 | while (pkts_to_be_removed) { | |
386 | if (bcsp->rxack == seqno) | |
387 | break; | |
388 | pkts_to_be_removed--; | |
389 | seqno = (seqno - 1) & 0x07; | |
390 | } | |
391 | ||
392 | if (bcsp->rxack != seqno) | |
393 | BT_ERR("Peer acked invalid packet"); | |
394 | ||
395 | BT_DBG("Removing %u pkts out of %u, up to seqno %u", | |
0372a662 | 396 | pkts_to_be_removed, bcsp->unack.qlen, (seqno - 1) & 0x07); |
1da177e4 LT |
397 | |
398 | for (i = 0, skb = ((struct sk_buff *) &bcsp->unack)->next; i < pkts_to_be_removed | |
399 | && skb != (struct sk_buff *) &bcsp->unack; i++) { | |
400 | struct sk_buff *nskb; | |
401 | ||
402 | nskb = skb->next; | |
403 | __skb_unlink(skb, &bcsp->unack); | |
404 | kfree_skb(skb); | |
405 | skb = nskb; | |
406 | } | |
0372a662 | 407 | |
1da177e4 LT |
408 | if (bcsp->unack.qlen == 0) |
409 | del_timer(&bcsp->tbcsp); | |
0372a662 | 410 | |
1da177e4 LT |
411 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); |
412 | ||
413 | if (i != pkts_to_be_removed) | |
414 | BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed); | |
415 | } | |
416 | ||
417 | /* Handle BCSP link-establishment packets. When we | |
418 | detect a "sync" packet, symptom that the BT module has reset, | |
419 | we do nothing :) (yet) */ | |
420 | static void bcsp_handle_le_pkt(struct hci_uart *hu) | |
421 | { | |
422 | struct bcsp_struct *bcsp = hu->priv; | |
423 | u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed }; | |
424 | u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 }; | |
425 | u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed }; | |
426 | ||
427 | /* spot "conf" pkts and reply with a "conf rsp" pkt */ | |
428 | if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
429 | !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) { | |
430 | struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC); | |
431 | ||
432 | BT_DBG("Found a LE conf pkt"); | |
433 | if (!nskb) | |
434 | return; | |
435 | memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4); | |
0d48d939 | 436 | bt_cb(nskb)->pkt_type = BCSP_LE_PKT; |
1da177e4 LT |
437 | |
438 | skb_queue_head(&bcsp->unrel, nskb); | |
439 | hci_uart_tx_wakeup(hu); | |
440 | } | |
441 | /* Spot "sync" pkts. If we find one...disaster! */ | |
442 | else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
443 | !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) { | |
444 | BT_ERR("Found a LE sync pkt, card has reset"); | |
445 | } | |
446 | } | |
447 | ||
448 | static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte) | |
449 | { | |
450 | const u8 c0 = 0xc0, db = 0xdb; | |
451 | ||
452 | switch (bcsp->rx_esc_state) { | |
453 | case BCSP_ESCSTATE_NOESC: | |
454 | switch (byte) { | |
455 | case 0xdb: | |
456 | bcsp->rx_esc_state = BCSP_ESCSTATE_ESC; | |
457 | break; | |
458 | default: | |
459 | memcpy(skb_put(bcsp->rx_skb, 1), &byte, 1); | |
460 | if ((bcsp->rx_skb-> data[0] & 0x40) != 0 && | |
461 | bcsp->rx_state != BCSP_W4_CRC) | |
462 | bcsp_crc_update(&bcsp->message_crc, byte); | |
463 | bcsp->rx_count--; | |
464 | } | |
465 | break; | |
466 | ||
467 | case BCSP_ESCSTATE_ESC: | |
468 | switch (byte) { | |
469 | case 0xdc: | |
470 | memcpy(skb_put(bcsp->rx_skb, 1), &c0, 1); | |
471 | if ((bcsp->rx_skb-> data[0] & 0x40) != 0 && | |
472 | bcsp->rx_state != BCSP_W4_CRC) | |
473 | bcsp_crc_update(&bcsp-> message_crc, 0xc0); | |
474 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
475 | bcsp->rx_count--; | |
476 | break; | |
477 | ||
478 | case 0xdd: | |
479 | memcpy(skb_put(bcsp->rx_skb, 1), &db, 1); | |
480 | if ((bcsp->rx_skb-> data[0] & 0x40) != 0 && | |
481 | bcsp->rx_state != BCSP_W4_CRC) | |
482 | bcsp_crc_update(&bcsp-> message_crc, 0xdb); | |
483 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
484 | bcsp->rx_count--; | |
485 | break; | |
486 | ||
487 | default: | |
488 | BT_ERR ("Invalid byte %02x after esc byte", byte); | |
489 | kfree_skb(bcsp->rx_skb); | |
490 | bcsp->rx_skb = NULL; | |
491 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
492 | bcsp->rx_count = 0; | |
493 | } | |
494 | } | |
495 | } | |
496 | ||
858119e1 | 497 | static void bcsp_complete_rx_pkt(struct hci_uart *hu) |
1da177e4 LT |
498 | { |
499 | struct bcsp_struct *bcsp = hu->priv; | |
500 | int pass_up; | |
501 | ||
502 | if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */ | |
503 | BT_DBG("Received seqno %u from card", bcsp->rxseq_txack); | |
504 | bcsp->rxseq_txack++; | |
505 | bcsp->rxseq_txack %= 0x8; | |
506 | bcsp->txack_req = 1; | |
507 | ||
508 | /* If needed, transmit an ack pkt */ | |
509 | hci_uart_tx_wakeup(hu); | |
510 | } | |
511 | ||
512 | bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07; | |
513 | BT_DBG("Request for pkt %u from card", bcsp->rxack); | |
514 | ||
515 | bcsp_pkt_cull(bcsp); | |
516 | if ((bcsp->rx_skb->data[1] & 0x0f) == 6 && | |
517 | bcsp->rx_skb->data[0] & 0x80) { | |
0d48d939 | 518 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_ACLDATA_PKT; |
1da177e4 LT |
519 | pass_up = 1; |
520 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && | |
521 | bcsp->rx_skb->data[0] & 0x80) { | |
0d48d939 | 522 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
1da177e4 LT |
523 | pass_up = 1; |
524 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { | |
0d48d939 | 525 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_SCODATA_PKT; |
1da177e4 LT |
526 | pass_up = 1; |
527 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 && | |
528 | !(bcsp->rx_skb->data[0] & 0x80)) { | |
529 | bcsp_handle_le_pkt(hu); | |
530 | pass_up = 0; | |
531 | } else | |
532 | pass_up = 0; | |
533 | ||
534 | if (!pass_up) { | |
535 | struct hci_event_hdr hdr; | |
536 | u8 desc = (bcsp->rx_skb->data[1] & 0x0f); | |
537 | ||
538 | if (desc != 0 && desc != 1) { | |
539 | if (hciextn) { | |
540 | desc |= 0xc0; | |
541 | skb_pull(bcsp->rx_skb, 4); | |
542 | memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1); | |
543 | ||
544 | hdr.evt = 0xff; | |
545 | hdr.plen = bcsp->rx_skb->len; | |
546 | memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE); | |
0d48d939 | 547 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
1da177e4 LT |
548 | |
549 | hci_recv_frame(bcsp->rx_skb); | |
550 | } else { | |
551 | BT_ERR ("Packet for unknown channel (%u %s)", | |
552 | bcsp->rx_skb->data[1] & 0x0f, | |
553 | bcsp->rx_skb->data[0] & 0x80 ? | |
554 | "reliable" : "unreliable"); | |
555 | kfree_skb(bcsp->rx_skb); | |
556 | } | |
557 | } else | |
558 | kfree_skb(bcsp->rx_skb); | |
559 | } else { | |
560 | /* Pull out BCSP hdr */ | |
561 | skb_pull(bcsp->rx_skb, 4); | |
562 | ||
563 | hci_recv_frame(bcsp->rx_skb); | |
564 | } | |
0372a662 | 565 | |
1da177e4 LT |
566 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
567 | bcsp->rx_skb = NULL; | |
568 | } | |
569 | ||
570 | /* Recv data */ | |
571 | static int bcsp_recv(struct hci_uart *hu, void *data, int count) | |
572 | { | |
573 | struct bcsp_struct *bcsp = hu->priv; | |
574 | register unsigned char *ptr; | |
575 | ||
576 | BT_DBG("hu %p count %d rx_state %d rx_count %ld", | |
577 | hu, count, bcsp->rx_state, bcsp->rx_count); | |
578 | ||
579 | ptr = data; | |
580 | while (count) { | |
581 | if (bcsp->rx_count) { | |
582 | if (*ptr == 0xc0) { | |
583 | BT_ERR("Short BCSP packet"); | |
584 | kfree_skb(bcsp->rx_skb); | |
585 | bcsp->rx_state = BCSP_W4_PKT_START; | |
586 | bcsp->rx_count = 0; | |
587 | } else | |
588 | bcsp_unslip_one_byte(bcsp, *ptr); | |
589 | ||
590 | ptr++; count--; | |
591 | continue; | |
592 | } | |
593 | ||
594 | switch (bcsp->rx_state) { | |
595 | case BCSP_W4_BCSP_HDR: | |
596 | if ((0xff & (u8) ~ (bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] + | |
597 | bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { | |
598 | BT_ERR("Error in BCSP hdr checksum"); | |
599 | kfree_skb(bcsp->rx_skb); | |
600 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
601 | bcsp->rx_count = 0; | |
602 | continue; | |
603 | } | |
604 | if (bcsp->rx_skb->data[0] & 0x80 /* reliable pkt */ | |
605 | && (bcsp->rx_skb->data[0] & 0x07) != bcsp->rxseq_txack) { | |
606 | BT_ERR ("Out-of-order packet arrived, got %u expected %u", | |
607 | bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack); | |
608 | ||
609 | kfree_skb(bcsp->rx_skb); | |
610 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
611 | bcsp->rx_count = 0; | |
612 | continue; | |
613 | } | |
614 | bcsp->rx_state = BCSP_W4_DATA; | |
615 | bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) + | |
616 | (bcsp->rx_skb->data[2] << 4); /* May be 0 */ | |
617 | continue; | |
618 | ||
619 | case BCSP_W4_DATA: | |
620 | if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */ | |
621 | bcsp->rx_state = BCSP_W4_CRC; | |
622 | bcsp->rx_count = 2; | |
623 | } else | |
624 | bcsp_complete_rx_pkt(hu); | |
625 | continue; | |
626 | ||
627 | case BCSP_W4_CRC: | |
628 | if (bcsp_crc_reverse(bcsp->message_crc) != | |
629 | (bcsp->rx_skb->data[bcsp->rx_skb->len - 2] << 8) + | |
630 | bcsp->rx_skb->data[bcsp->rx_skb->len - 1]) { | |
631 | ||
632 | BT_ERR ("Checksum failed: computed %04x received %04x", | |
633 | bcsp_crc_reverse(bcsp->message_crc), | |
0372a662 MH |
634 | (bcsp->rx_skb-> data[bcsp->rx_skb->len - 2] << 8) + |
635 | bcsp->rx_skb->data[bcsp->rx_skb->len - 1]); | |
1da177e4 LT |
636 | |
637 | kfree_skb(bcsp->rx_skb); | |
638 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
639 | bcsp->rx_count = 0; | |
640 | continue; | |
641 | } | |
642 | skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2); | |
643 | bcsp_complete_rx_pkt(hu); | |
644 | continue; | |
645 | ||
646 | case BCSP_W4_PKT_DELIMITER: | |
647 | switch (*ptr) { | |
648 | case 0xc0: | |
649 | bcsp->rx_state = BCSP_W4_PKT_START; | |
650 | break; | |
651 | default: | |
652 | /*BT_ERR("Ignoring byte %02x", *ptr);*/ | |
653 | break; | |
654 | } | |
655 | ptr++; count--; | |
656 | break; | |
657 | ||
658 | case BCSP_W4_PKT_START: | |
659 | switch (*ptr) { | |
660 | case 0xc0: | |
661 | ptr++; count--; | |
662 | break; | |
663 | ||
664 | default: | |
665 | bcsp->rx_state = BCSP_W4_BCSP_HDR; | |
666 | bcsp->rx_count = 4; | |
667 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
668 | BCSP_CRC_INIT(bcsp->message_crc); | |
0372a662 | 669 | |
1da177e4 LT |
670 | /* Do not increment ptr or decrement count |
671 | * Allocate packet. Max len of a BCSP pkt= | |
672 | * 0xFFF (payload) +4 (header) +2 (crc) */ | |
673 | ||
674 | bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC); | |
675 | if (!bcsp->rx_skb) { | |
676 | BT_ERR("Can't allocate mem for new packet"); | |
677 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
678 | bcsp->rx_count = 0; | |
679 | return 0; | |
680 | } | |
681 | bcsp->rx_skb->dev = (void *) hu->hdev; | |
682 | break; | |
683 | } | |
684 | break; | |
685 | } | |
686 | } | |
687 | return count; | |
688 | } | |
689 | ||
690 | /* Arrange to retransmit all messages in the relq. */ | |
691 | static void bcsp_timed_event(unsigned long arg) | |
692 | { | |
693 | struct hci_uart *hu = (struct hci_uart *) arg; | |
694 | struct bcsp_struct *bcsp = hu->priv; | |
695 | struct sk_buff *skb; | |
696 | unsigned long flags; | |
697 | ||
698 | BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen); | |
699 | ||
700 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
701 | ||
702 | while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) { | |
703 | bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07; | |
704 | skb_queue_head(&bcsp->rel, skb); | |
705 | } | |
706 | ||
707 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
708 | ||
709 | hci_uart_tx_wakeup(hu); | |
710 | } | |
711 | ||
712 | static int bcsp_open(struct hci_uart *hu) | |
713 | { | |
714 | struct bcsp_struct *bcsp; | |
715 | ||
716 | BT_DBG("hu %p", hu); | |
717 | ||
089b1dbb | 718 | bcsp = kzalloc(sizeof(*bcsp), GFP_ATOMIC); |
1da177e4 LT |
719 | if (!bcsp) |
720 | return -ENOMEM; | |
1da177e4 LT |
721 | |
722 | hu->priv = bcsp; | |
723 | skb_queue_head_init(&bcsp->unack); | |
724 | skb_queue_head_init(&bcsp->rel); | |
725 | skb_queue_head_init(&bcsp->unrel); | |
726 | ||
727 | init_timer(&bcsp->tbcsp); | |
728 | bcsp->tbcsp.function = bcsp_timed_event; | |
729 | bcsp->tbcsp.data = (u_long) hu; | |
730 | ||
731 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
732 | ||
20dd6f59 MH |
733 | if (txcrc) |
734 | bcsp->use_crc = 1; | |
735 | ||
1da177e4 LT |
736 | return 0; |
737 | } | |
738 | ||
739 | static int bcsp_close(struct hci_uart *hu) | |
740 | { | |
741 | struct bcsp_struct *bcsp = hu->priv; | |
742 | hu->priv = NULL; | |
743 | ||
744 | BT_DBG("hu %p", hu); | |
745 | ||
746 | skb_queue_purge(&bcsp->unack); | |
747 | skb_queue_purge(&bcsp->rel); | |
748 | skb_queue_purge(&bcsp->unrel); | |
749 | del_timer(&bcsp->tbcsp); | |
750 | ||
751 | kfree(bcsp); | |
752 | return 0; | |
753 | } | |
754 | ||
755 | static struct hci_uart_proto bcsp = { | |
0372a662 MH |
756 | .id = HCI_UART_BCSP, |
757 | .open = bcsp_open, | |
758 | .close = bcsp_close, | |
759 | .enqueue = bcsp_enqueue, | |
760 | .dequeue = bcsp_dequeue, | |
761 | .recv = bcsp_recv, | |
762 | .flush = bcsp_flush | |
1da177e4 LT |
763 | }; |
764 | ||
765 | int bcsp_init(void) | |
766 | { | |
767 | int err = hci_uart_register_proto(&bcsp); | |
0372a662 | 768 | |
1da177e4 LT |
769 | if (!err) |
770 | BT_INFO("HCI BCSP protocol initialized"); | |
771 | else | |
772 | BT_ERR("HCI BCSP protocol registration failed"); | |
773 | ||
774 | return err; | |
775 | } | |
776 | ||
777 | int bcsp_deinit(void) | |
778 | { | |
779 | return hci_uart_unregister_proto(&bcsp); | |
780 | } | |
781 | ||
20dd6f59 MH |
782 | module_param(txcrc, bool, 0644); |
783 | MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet"); | |
784 | ||
1da177e4 LT |
785 | module_param(hciextn, bool, 0644); |
786 | MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets"); |