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Commit | Line | Data |
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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> | |
42 | ||
43 | #include <net/bluetooth/bluetooth.h> | |
44 | #include <net/bluetooth/hci_core.h> | |
0372a662 | 45 | |
1da177e4 | 46 | #include "hci_uart.h" |
1da177e4 LT |
47 | |
48 | #ifndef CONFIG_BT_HCIUART_DEBUG | |
49 | #undef BT_DBG | |
50 | #define BT_DBG( A... ) | |
1da177e4 LT |
51 | #endif |
52 | ||
0372a662 MH |
53 | #define VERSION "0.3" |
54 | ||
20dd6f59 | 55 | static int txcrc = 1; |
1da177e4 LT |
56 | static int hciextn = 1; |
57 | ||
0372a662 MH |
58 | #define BCSP_TXWINSIZE 4 |
59 | ||
60 | #define BCSP_ACK_PKT 0x05 | |
61 | #define BCSP_LE_PKT 0x06 | |
62 | ||
63 | struct bcsp_struct { | |
64 | struct sk_buff_head unack; /* Unack'ed packets queue */ | |
65 | struct sk_buff_head rel; /* Reliable packets queue */ | |
66 | struct sk_buff_head unrel; /* Unreliable packets queue */ | |
67 | ||
68 | unsigned long rx_count; | |
69 | struct sk_buff *rx_skb; | |
70 | u8 rxseq_txack; /* rxseq == txack. */ | |
71 | u8 rxack; /* Last packet sent by us that the peer ack'ed */ | |
72 | struct timer_list tbcsp; | |
73 | ||
74 | enum { | |
75 | BCSP_W4_PKT_DELIMITER, | |
76 | BCSP_W4_PKT_START, | |
77 | BCSP_W4_BCSP_HDR, | |
78 | BCSP_W4_DATA, | |
79 | BCSP_W4_CRC | |
80 | } rx_state; | |
81 | ||
82 | enum { | |
83 | BCSP_ESCSTATE_NOESC, | |
84 | BCSP_ESCSTATE_ESC | |
85 | } rx_esc_state; | |
86 | ||
87 | u8 use_crc; | |
88 | u16 message_crc; | |
89 | u8 txack_req; /* Do we need to send ack's to the peer? */ | |
90 | ||
91 | /* Reliable packet sequence number - used to assign seq to each rel pkt. */ | |
92 | u8 msgq_txseq; | |
93 | }; | |
94 | ||
1da177e4 LT |
95 | /* ---- BCSP CRC calculation ---- */ |
96 | ||
97 | /* Table for calculating CRC for polynomial 0x1021, LSB processed first, | |
98 | initial value 0xffff, bits shifted in reverse order. */ | |
99 | ||
100 | static const u16 crc_table[] = { | |
101 | 0x0000, 0x1081, 0x2102, 0x3183, | |
102 | 0x4204, 0x5285, 0x6306, 0x7387, | |
103 | 0x8408, 0x9489, 0xa50a, 0xb58b, | |
104 | 0xc60c, 0xd68d, 0xe70e, 0xf78f | |
105 | }; | |
106 | ||
107 | /* Initialise the crc calculator */ | |
108 | #define BCSP_CRC_INIT(x) x = 0xffff | |
109 | ||
110 | /* | |
111 | Update crc with next data byte | |
112 | ||
113 | Implementation note | |
114 | The data byte is treated as two nibbles. The crc is generated | |
115 | in reverse, i.e., bits are fed into the register from the top. | |
116 | */ | |
117 | static void bcsp_crc_update(u16 *crc, u8 d) | |
118 | { | |
119 | u16 reg = *crc; | |
120 | ||
121 | reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f]; | |
122 | reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f]; | |
123 | ||
124 | *crc = reg; | |
125 | } | |
126 | ||
127 | /* | |
128 | Get reverse of generated crc | |
129 | ||
130 | Implementation note | |
131 | The crc generator (bcsp_crc_init() and bcsp_crc_update()) | |
132 | creates a reversed crc, so it needs to be swapped back before | |
133 | being passed on. | |
134 | */ | |
135 | static u16 bcsp_crc_reverse(u16 crc) | |
136 | { | |
137 | u16 b, rev; | |
138 | ||
139 | for (b = 0, rev = 0; b < 16; b++) { | |
140 | rev = rev << 1; | |
141 | rev |= (crc & 1); | |
142 | crc = crc >> 1; | |
143 | } | |
0372a662 | 144 | |
1da177e4 LT |
145 | return (rev); |
146 | } | |
147 | ||
148 | /* ---- BCSP core ---- */ | |
149 | ||
150 | static void bcsp_slip_msgdelim(struct sk_buff *skb) | |
151 | { | |
152 | const char pkt_delim = 0xc0; | |
0372a662 | 153 | |
1da177e4 LT |
154 | memcpy(skb_put(skb, 1), &pkt_delim, 1); |
155 | } | |
156 | ||
157 | static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c) | |
158 | { | |
159 | const char esc_c0[2] = { 0xdb, 0xdc }; | |
160 | const char esc_db[2] = { 0xdb, 0xdd }; | |
161 | ||
162 | switch (c) { | |
163 | case 0xc0: | |
164 | memcpy(skb_put(skb, 2), &esc_c0, 2); | |
165 | break; | |
166 | case 0xdb: | |
167 | memcpy(skb_put(skb, 2), &esc_db, 2); | |
168 | break; | |
169 | default: | |
170 | memcpy(skb_put(skb, 1), &c, 1); | |
171 | } | |
172 | } | |
173 | ||
174 | static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
175 | { | |
176 | struct bcsp_struct *bcsp = hu->priv; | |
177 | ||
178 | if (skb->len > 0xFFF) { | |
179 | BT_ERR("Packet too long"); | |
180 | kfree_skb(skb); | |
181 | return 0; | |
182 | } | |
183 | ||
0d48d939 | 184 | switch (bt_cb(skb)->pkt_type) { |
1da177e4 LT |
185 | case HCI_ACLDATA_PKT: |
186 | case HCI_COMMAND_PKT: | |
187 | skb_queue_tail(&bcsp->rel, skb); | |
188 | break; | |
189 | ||
190 | case HCI_SCODATA_PKT: | |
191 | skb_queue_tail(&bcsp->unrel, skb); | |
192 | break; | |
193 | ||
194 | default: | |
195 | BT_ERR("Unknown packet type"); | |
196 | kfree_skb(skb); | |
197 | break; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, | |
204 | int len, int pkt_type) | |
205 | { | |
206 | struct sk_buff *nskb; | |
207 | u8 hdr[4], chan; | |
1da177e4 | 208 | u16 BCSP_CRC_INIT(bcsp_txmsg_crc); |
20dd6f59 | 209 | int rel, i; |
1da177e4 LT |
210 | |
211 | switch (pkt_type) { | |
212 | case HCI_ACLDATA_PKT: | |
213 | chan = 6; /* BCSP ACL channel */ | |
214 | rel = 1; /* reliable channel */ | |
215 | break; | |
216 | case HCI_COMMAND_PKT: | |
217 | chan = 5; /* BCSP cmd/evt channel */ | |
218 | rel = 1; /* reliable channel */ | |
219 | break; | |
220 | case HCI_SCODATA_PKT: | |
221 | chan = 7; /* BCSP SCO channel */ | |
222 | rel = 0; /* unreliable channel */ | |
223 | break; | |
224 | case BCSP_LE_PKT: | |
225 | chan = 1; /* BCSP LE channel */ | |
226 | rel = 0; /* unreliable channel */ | |
227 | break; | |
228 | case BCSP_ACK_PKT: | |
229 | chan = 0; /* BCSP internal channel */ | |
230 | rel = 0; /* unreliable channel */ | |
231 | break; | |
232 | default: | |
233 | BT_ERR("Unknown packet type"); | |
234 | return NULL; | |
235 | } | |
236 | ||
237 | if (hciextn && chan == 5) { | |
238 | struct hci_command_hdr *hdr = (struct hci_command_hdr *) data; | |
239 | ||
240 | if (hci_opcode_ogf(__le16_to_cpu(hdr->opcode)) == OGF_VENDOR_CMD) { | |
241 | u8 desc = *(data + HCI_COMMAND_HDR_SIZE); | |
242 | if ((desc & 0xf0) == 0xc0) { | |
243 | data += HCI_COMMAND_HDR_SIZE + 1; | |
244 | len -= HCI_COMMAND_HDR_SIZE + 1; | |
245 | chan = desc & 0x0f; | |
246 | } | |
247 | } | |
248 | } | |
249 | ||
250 | /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2 | |
251 | (because bytes 0xc0 and 0xdb are escaped, worst case is | |
252 | when the packet is all made of 0xc0 and 0xdb :) ) | |
253 | + 2 (0xc0 delimiters at start and end). */ | |
254 | ||
255 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); | |
256 | if (!nskb) | |
257 | return NULL; | |
258 | ||
0d48d939 | 259 | bt_cb(nskb)->pkt_type = pkt_type; |
1da177e4 LT |
260 | |
261 | bcsp_slip_msgdelim(nskb); | |
262 | ||
263 | hdr[0] = bcsp->rxseq_txack << 3; | |
264 | bcsp->txack_req = 0; | |
265 | BT_DBG("We request packet no %u to card", bcsp->rxseq_txack); | |
266 | ||
267 | if (rel) { | |
268 | hdr[0] |= 0x80 + bcsp->msgq_txseq; | |
269 | BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq); | |
270 | bcsp->msgq_txseq = ++(bcsp->msgq_txseq) & 0x07; | |
271 | } | |
20dd6f59 MH |
272 | |
273 | if (bcsp->use_crc) | |
274 | hdr[0] |= 0x40; | |
1da177e4 LT |
275 | |
276 | hdr[1] = ((len << 4) & 0xff) | chan; | |
277 | hdr[2] = len >> 4; | |
278 | hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]); | |
279 | ||
280 | /* Put BCSP header */ | |
281 | for (i = 0; i < 4; i++) { | |
282 | bcsp_slip_one_byte(nskb, hdr[i]); | |
20dd6f59 MH |
283 | |
284 | if (bcsp->use_crc) | |
285 | bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); | |
1da177e4 LT |
286 | } |
287 | ||
288 | /* Put payload */ | |
289 | for (i = 0; i < len; i++) { | |
290 | bcsp_slip_one_byte(nskb, data[i]); | |
20dd6f59 MH |
291 | |
292 | if (bcsp->use_crc) | |
293 | bcsp_crc_update(&bcsp_txmsg_crc, data[i]); | |
1da177e4 LT |
294 | } |
295 | ||
1da177e4 | 296 | /* Put CRC */ |
20dd6f59 MH |
297 | if (bcsp->use_crc) { |
298 | bcsp_txmsg_crc = bcsp_crc_reverse(bcsp_txmsg_crc); | |
299 | bcsp_slip_one_byte(nskb, (u8) ((bcsp_txmsg_crc >> 8) & 0x00ff)); | |
300 | bcsp_slip_one_byte(nskb, (u8) (bcsp_txmsg_crc & 0x00ff)); | |
301 | } | |
1da177e4 LT |
302 | |
303 | bcsp_slip_msgdelim(nskb); | |
304 | return nskb; | |
305 | } | |
306 | ||
307 | /* This is a rewrite of pkt_avail in ABCSP */ | |
308 | static struct sk_buff *bcsp_dequeue(struct hci_uart *hu) | |
309 | { | |
310 | struct bcsp_struct *bcsp = hu->priv; | |
311 | unsigned long flags; | |
312 | struct sk_buff *skb; | |
313 | ||
314 | /* First of all, check for unreliable messages in the queue, | |
315 | since they have priority */ | |
316 | ||
317 | if ((skb = skb_dequeue(&bcsp->unrel)) != NULL) { | |
0d48d939 | 318 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type); |
1da177e4 LT |
319 | if (nskb) { |
320 | kfree_skb(skb); | |
321 | return nskb; | |
322 | } else { | |
323 | skb_queue_head(&bcsp->unrel, skb); | |
324 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
325 | } | |
326 | } | |
327 | ||
328 | /* Now, try to send a reliable pkt. We can only send a | |
329 | reliable packet if the number of packets sent but not yet ack'ed | |
330 | is < than the winsize */ | |
331 | ||
f89d75f2 | 332 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
333 | |
334 | if (bcsp->unack.qlen < BCSP_TXWINSIZE && (skb = skb_dequeue(&bcsp->rel)) != NULL) { | |
0d48d939 | 335 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, bt_cb(skb)->pkt_type); |
1da177e4 LT |
336 | if (nskb) { |
337 | __skb_queue_tail(&bcsp->unack, skb); | |
338 | mod_timer(&bcsp->tbcsp, jiffies + HZ / 4); | |
339 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
340 | return nskb; | |
341 | } else { | |
342 | skb_queue_head(&bcsp->rel, skb); | |
343 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
344 | } | |
345 | } | |
346 | ||
347 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
348 | ||
1da177e4 LT |
349 | /* We could not send a reliable packet, either because there are |
350 | none or because there are too many unack'ed pkts. Did we receive | |
351 | any packets we have not acknowledged yet ? */ | |
352 | ||
353 | if (bcsp->txack_req) { | |
354 | /* if so, craft an empty ACK pkt and send it on BCSP unreliable | |
355 | channel 0 */ | |
356 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT); | |
357 | return nskb; | |
358 | } | |
359 | ||
360 | /* We have nothing to send */ | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | static int bcsp_flush(struct hci_uart *hu) | |
365 | { | |
366 | BT_DBG("hu %p", hu); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | /* Remove ack'ed packets */ | |
371 | static void bcsp_pkt_cull(struct bcsp_struct *bcsp) | |
372 | { | |
373 | unsigned long flags; | |
374 | struct sk_buff *skb; | |
375 | int i, pkts_to_be_removed; | |
376 | u8 seqno; | |
377 | ||
378 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
379 | ||
380 | pkts_to_be_removed = bcsp->unack.qlen; | |
381 | seqno = bcsp->msgq_txseq; | |
382 | ||
383 | while (pkts_to_be_removed) { | |
384 | if (bcsp->rxack == seqno) | |
385 | break; | |
386 | pkts_to_be_removed--; | |
387 | seqno = (seqno - 1) & 0x07; | |
388 | } | |
389 | ||
390 | if (bcsp->rxack != seqno) | |
391 | BT_ERR("Peer acked invalid packet"); | |
392 | ||
393 | BT_DBG("Removing %u pkts out of %u, up to seqno %u", | |
0372a662 | 394 | pkts_to_be_removed, bcsp->unack.qlen, (seqno - 1) & 0x07); |
1da177e4 LT |
395 | |
396 | for (i = 0, skb = ((struct sk_buff *) &bcsp->unack)->next; i < pkts_to_be_removed | |
397 | && skb != (struct sk_buff *) &bcsp->unack; i++) { | |
398 | struct sk_buff *nskb; | |
399 | ||
400 | nskb = skb->next; | |
401 | __skb_unlink(skb, &bcsp->unack); | |
402 | kfree_skb(skb); | |
403 | skb = nskb; | |
404 | } | |
0372a662 | 405 | |
1da177e4 LT |
406 | if (bcsp->unack.qlen == 0) |
407 | del_timer(&bcsp->tbcsp); | |
0372a662 | 408 | |
1da177e4 LT |
409 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); |
410 | ||
411 | if (i != pkts_to_be_removed) | |
412 | BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed); | |
413 | } | |
414 | ||
415 | /* Handle BCSP link-establishment packets. When we | |
416 | detect a "sync" packet, symptom that the BT module has reset, | |
417 | we do nothing :) (yet) */ | |
418 | static void bcsp_handle_le_pkt(struct hci_uart *hu) | |
419 | { | |
420 | struct bcsp_struct *bcsp = hu->priv; | |
421 | u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed }; | |
422 | u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 }; | |
423 | u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed }; | |
424 | ||
425 | /* spot "conf" pkts and reply with a "conf rsp" pkt */ | |
426 | if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
427 | !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) { | |
428 | struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC); | |
429 | ||
430 | BT_DBG("Found a LE conf pkt"); | |
431 | if (!nskb) | |
432 | return; | |
433 | memcpy(skb_put(nskb, 4), conf_rsp_pkt, 4); | |
0d48d939 | 434 | bt_cb(nskb)->pkt_type = BCSP_LE_PKT; |
1da177e4 LT |
435 | |
436 | skb_queue_head(&bcsp->unrel, nskb); | |
437 | hci_uart_tx_wakeup(hu); | |
438 | } | |
439 | /* Spot "sync" pkts. If we find one...disaster! */ | |
440 | else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
441 | !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) { | |
442 | BT_ERR("Found a LE sync pkt, card has reset"); | |
443 | } | |
444 | } | |
445 | ||
446 | static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte) | |
447 | { | |
448 | const u8 c0 = 0xc0, db = 0xdb; | |
449 | ||
450 | switch (bcsp->rx_esc_state) { | |
451 | case BCSP_ESCSTATE_NOESC: | |
452 | switch (byte) { | |
453 | case 0xdb: | |
454 | bcsp->rx_esc_state = BCSP_ESCSTATE_ESC; | |
455 | break; | |
456 | default: | |
457 | memcpy(skb_put(bcsp->rx_skb, 1), &byte, 1); | |
458 | if ((bcsp->rx_skb-> data[0] & 0x40) != 0 && | |
459 | bcsp->rx_state != BCSP_W4_CRC) | |
460 | bcsp_crc_update(&bcsp->message_crc, byte); | |
461 | bcsp->rx_count--; | |
462 | } | |
463 | break; | |
464 | ||
465 | case BCSP_ESCSTATE_ESC: | |
466 | switch (byte) { | |
467 | case 0xdc: | |
468 | memcpy(skb_put(bcsp->rx_skb, 1), &c0, 1); | |
469 | if ((bcsp->rx_skb-> data[0] & 0x40) != 0 && | |
470 | bcsp->rx_state != BCSP_W4_CRC) | |
471 | bcsp_crc_update(&bcsp-> message_crc, 0xc0); | |
472 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
473 | bcsp->rx_count--; | |
474 | break; | |
475 | ||
476 | case 0xdd: | |
477 | memcpy(skb_put(bcsp->rx_skb, 1), &db, 1); | |
478 | if ((bcsp->rx_skb-> data[0] & 0x40) != 0 && | |
479 | bcsp->rx_state != BCSP_W4_CRC) | |
480 | bcsp_crc_update(&bcsp-> message_crc, 0xdb); | |
481 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
482 | bcsp->rx_count--; | |
483 | break; | |
484 | ||
485 | default: | |
486 | BT_ERR ("Invalid byte %02x after esc byte", byte); | |
487 | kfree_skb(bcsp->rx_skb); | |
488 | bcsp->rx_skb = NULL; | |
489 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
490 | bcsp->rx_count = 0; | |
491 | } | |
492 | } | |
493 | } | |
494 | ||
858119e1 | 495 | static void bcsp_complete_rx_pkt(struct hci_uart *hu) |
1da177e4 LT |
496 | { |
497 | struct bcsp_struct *bcsp = hu->priv; | |
498 | int pass_up; | |
499 | ||
500 | if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */ | |
501 | BT_DBG("Received seqno %u from card", bcsp->rxseq_txack); | |
502 | bcsp->rxseq_txack++; | |
503 | bcsp->rxseq_txack %= 0x8; | |
504 | bcsp->txack_req = 1; | |
505 | ||
506 | /* If needed, transmit an ack pkt */ | |
507 | hci_uart_tx_wakeup(hu); | |
508 | } | |
509 | ||
510 | bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07; | |
511 | BT_DBG("Request for pkt %u from card", bcsp->rxack); | |
512 | ||
513 | bcsp_pkt_cull(bcsp); | |
514 | if ((bcsp->rx_skb->data[1] & 0x0f) == 6 && | |
515 | bcsp->rx_skb->data[0] & 0x80) { | |
0d48d939 | 516 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_ACLDATA_PKT; |
1da177e4 LT |
517 | pass_up = 1; |
518 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && | |
519 | bcsp->rx_skb->data[0] & 0x80) { | |
0d48d939 | 520 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
1da177e4 LT |
521 | pass_up = 1; |
522 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { | |
0d48d939 | 523 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_SCODATA_PKT; |
1da177e4 LT |
524 | pass_up = 1; |
525 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 && | |
526 | !(bcsp->rx_skb->data[0] & 0x80)) { | |
527 | bcsp_handle_le_pkt(hu); | |
528 | pass_up = 0; | |
529 | } else | |
530 | pass_up = 0; | |
531 | ||
532 | if (!pass_up) { | |
533 | struct hci_event_hdr hdr; | |
534 | u8 desc = (bcsp->rx_skb->data[1] & 0x0f); | |
535 | ||
536 | if (desc != 0 && desc != 1) { | |
537 | if (hciextn) { | |
538 | desc |= 0xc0; | |
539 | skb_pull(bcsp->rx_skb, 4); | |
540 | memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1); | |
541 | ||
542 | hdr.evt = 0xff; | |
543 | hdr.plen = bcsp->rx_skb->len; | |
544 | memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE); | |
0d48d939 | 545 | bt_cb(bcsp->rx_skb)->pkt_type = HCI_EVENT_PKT; |
1da177e4 LT |
546 | |
547 | hci_recv_frame(bcsp->rx_skb); | |
548 | } else { | |
549 | BT_ERR ("Packet for unknown channel (%u %s)", | |
550 | bcsp->rx_skb->data[1] & 0x0f, | |
551 | bcsp->rx_skb->data[0] & 0x80 ? | |
552 | "reliable" : "unreliable"); | |
553 | kfree_skb(bcsp->rx_skb); | |
554 | } | |
555 | } else | |
556 | kfree_skb(bcsp->rx_skb); | |
557 | } else { | |
558 | /* Pull out BCSP hdr */ | |
559 | skb_pull(bcsp->rx_skb, 4); | |
560 | ||
561 | hci_recv_frame(bcsp->rx_skb); | |
562 | } | |
0372a662 | 563 | |
1da177e4 LT |
564 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
565 | bcsp->rx_skb = NULL; | |
566 | } | |
567 | ||
568 | /* Recv data */ | |
569 | static int bcsp_recv(struct hci_uart *hu, void *data, int count) | |
570 | { | |
571 | struct bcsp_struct *bcsp = hu->priv; | |
572 | register unsigned char *ptr; | |
573 | ||
574 | BT_DBG("hu %p count %d rx_state %d rx_count %ld", | |
575 | hu, count, bcsp->rx_state, bcsp->rx_count); | |
576 | ||
577 | ptr = data; | |
578 | while (count) { | |
579 | if (bcsp->rx_count) { | |
580 | if (*ptr == 0xc0) { | |
581 | BT_ERR("Short BCSP packet"); | |
582 | kfree_skb(bcsp->rx_skb); | |
583 | bcsp->rx_state = BCSP_W4_PKT_START; | |
584 | bcsp->rx_count = 0; | |
585 | } else | |
586 | bcsp_unslip_one_byte(bcsp, *ptr); | |
587 | ||
588 | ptr++; count--; | |
589 | continue; | |
590 | } | |
591 | ||
592 | switch (bcsp->rx_state) { | |
593 | case BCSP_W4_BCSP_HDR: | |
594 | if ((0xff & (u8) ~ (bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] + | |
595 | bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { | |
596 | BT_ERR("Error in BCSP hdr checksum"); | |
597 | kfree_skb(bcsp->rx_skb); | |
598 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
599 | bcsp->rx_count = 0; | |
600 | continue; | |
601 | } | |
602 | if (bcsp->rx_skb->data[0] & 0x80 /* reliable pkt */ | |
603 | && (bcsp->rx_skb->data[0] & 0x07) != bcsp->rxseq_txack) { | |
604 | BT_ERR ("Out-of-order packet arrived, got %u expected %u", | |
605 | bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack); | |
606 | ||
607 | kfree_skb(bcsp->rx_skb); | |
608 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
609 | bcsp->rx_count = 0; | |
610 | continue; | |
611 | } | |
612 | bcsp->rx_state = BCSP_W4_DATA; | |
613 | bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) + | |
614 | (bcsp->rx_skb->data[2] << 4); /* May be 0 */ | |
615 | continue; | |
616 | ||
617 | case BCSP_W4_DATA: | |
618 | if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */ | |
619 | bcsp->rx_state = BCSP_W4_CRC; | |
620 | bcsp->rx_count = 2; | |
621 | } else | |
622 | bcsp_complete_rx_pkt(hu); | |
623 | continue; | |
624 | ||
625 | case BCSP_W4_CRC: | |
626 | if (bcsp_crc_reverse(bcsp->message_crc) != | |
627 | (bcsp->rx_skb->data[bcsp->rx_skb->len - 2] << 8) + | |
628 | bcsp->rx_skb->data[bcsp->rx_skb->len - 1]) { | |
629 | ||
630 | BT_ERR ("Checksum failed: computed %04x received %04x", | |
631 | bcsp_crc_reverse(bcsp->message_crc), | |
0372a662 MH |
632 | (bcsp->rx_skb-> data[bcsp->rx_skb->len - 2] << 8) + |
633 | bcsp->rx_skb->data[bcsp->rx_skb->len - 1]); | |
1da177e4 LT |
634 | |
635 | kfree_skb(bcsp->rx_skb); | |
636 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
637 | bcsp->rx_count = 0; | |
638 | continue; | |
639 | } | |
640 | skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2); | |
641 | bcsp_complete_rx_pkt(hu); | |
642 | continue; | |
643 | ||
644 | case BCSP_W4_PKT_DELIMITER: | |
645 | switch (*ptr) { | |
646 | case 0xc0: | |
647 | bcsp->rx_state = BCSP_W4_PKT_START; | |
648 | break; | |
649 | default: | |
650 | /*BT_ERR("Ignoring byte %02x", *ptr);*/ | |
651 | break; | |
652 | } | |
653 | ptr++; count--; | |
654 | break; | |
655 | ||
656 | case BCSP_W4_PKT_START: | |
657 | switch (*ptr) { | |
658 | case 0xc0: | |
659 | ptr++; count--; | |
660 | break; | |
661 | ||
662 | default: | |
663 | bcsp->rx_state = BCSP_W4_BCSP_HDR; | |
664 | bcsp->rx_count = 4; | |
665 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
666 | BCSP_CRC_INIT(bcsp->message_crc); | |
0372a662 | 667 | |
1da177e4 LT |
668 | /* Do not increment ptr or decrement count |
669 | * Allocate packet. Max len of a BCSP pkt= | |
670 | * 0xFFF (payload) +4 (header) +2 (crc) */ | |
671 | ||
672 | bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC); | |
673 | if (!bcsp->rx_skb) { | |
674 | BT_ERR("Can't allocate mem for new packet"); | |
675 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
676 | bcsp->rx_count = 0; | |
677 | return 0; | |
678 | } | |
679 | bcsp->rx_skb->dev = (void *) hu->hdev; | |
680 | break; | |
681 | } | |
682 | break; | |
683 | } | |
684 | } | |
685 | return count; | |
686 | } | |
687 | ||
688 | /* Arrange to retransmit all messages in the relq. */ | |
689 | static void bcsp_timed_event(unsigned long arg) | |
690 | { | |
691 | struct hci_uart *hu = (struct hci_uart *) arg; | |
692 | struct bcsp_struct *bcsp = hu->priv; | |
693 | struct sk_buff *skb; | |
694 | unsigned long flags; | |
695 | ||
696 | BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen); | |
697 | ||
f89d75f2 | 698 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
699 | |
700 | while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) { | |
701 | bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07; | |
702 | skb_queue_head(&bcsp->rel, skb); | |
703 | } | |
704 | ||
705 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
706 | ||
707 | hci_uart_tx_wakeup(hu); | |
708 | } | |
709 | ||
710 | static int bcsp_open(struct hci_uart *hu) | |
711 | { | |
712 | struct bcsp_struct *bcsp; | |
713 | ||
714 | BT_DBG("hu %p", hu); | |
715 | ||
089b1dbb | 716 | bcsp = kzalloc(sizeof(*bcsp), GFP_ATOMIC); |
1da177e4 LT |
717 | if (!bcsp) |
718 | return -ENOMEM; | |
1da177e4 LT |
719 | |
720 | hu->priv = bcsp; | |
721 | skb_queue_head_init(&bcsp->unack); | |
722 | skb_queue_head_init(&bcsp->rel); | |
723 | skb_queue_head_init(&bcsp->unrel); | |
724 | ||
725 | init_timer(&bcsp->tbcsp); | |
726 | bcsp->tbcsp.function = bcsp_timed_event; | |
727 | bcsp->tbcsp.data = (u_long) hu; | |
728 | ||
729 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
730 | ||
20dd6f59 MH |
731 | if (txcrc) |
732 | bcsp->use_crc = 1; | |
733 | ||
1da177e4 LT |
734 | return 0; |
735 | } | |
736 | ||
737 | static int bcsp_close(struct hci_uart *hu) | |
738 | { | |
739 | struct bcsp_struct *bcsp = hu->priv; | |
740 | hu->priv = NULL; | |
741 | ||
742 | BT_DBG("hu %p", hu); | |
743 | ||
744 | skb_queue_purge(&bcsp->unack); | |
745 | skb_queue_purge(&bcsp->rel); | |
746 | skb_queue_purge(&bcsp->unrel); | |
747 | del_timer(&bcsp->tbcsp); | |
748 | ||
749 | kfree(bcsp); | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static struct hci_uart_proto bcsp = { | |
0372a662 MH |
754 | .id = HCI_UART_BCSP, |
755 | .open = bcsp_open, | |
756 | .close = bcsp_close, | |
757 | .enqueue = bcsp_enqueue, | |
758 | .dequeue = bcsp_dequeue, | |
759 | .recv = bcsp_recv, | |
760 | .flush = bcsp_flush | |
1da177e4 LT |
761 | }; |
762 | ||
763 | int bcsp_init(void) | |
764 | { | |
765 | int err = hci_uart_register_proto(&bcsp); | |
0372a662 | 766 | |
1da177e4 LT |
767 | if (!err) |
768 | BT_INFO("HCI BCSP protocol initialized"); | |
769 | else | |
770 | BT_ERR("HCI BCSP protocol registration failed"); | |
771 | ||
772 | return err; | |
773 | } | |
774 | ||
775 | int bcsp_deinit(void) | |
776 | { | |
777 | return hci_uart_unregister_proto(&bcsp); | |
778 | } | |
779 | ||
20dd6f59 MH |
780 | module_param(txcrc, bool, 0644); |
781 | MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet"); | |
782 | ||
1da177e4 LT |
783 | module_param(hciextn, bool, 0644); |
784 | MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets"); |