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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> | |
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, | |
8083ad1c DJ |
93 | * initial value 0xffff, bits shifted in reverse order. |
94 | */ | |
1da177e4 LT |
95 | |
96 | static const u16 crc_table[] = { | |
97 | 0x0000, 0x1081, 0x2102, 0x3183, | |
98 | 0x4204, 0x5285, 0x6306, 0x7387, | |
99 | 0x8408, 0x9489, 0xa50a, 0xb58b, | |
100 | 0xc60c, 0xd68d, 0xe70e, 0xf78f | |
101 | }; | |
102 | ||
103 | /* Initialise the crc calculator */ | |
104 | #define BCSP_CRC_INIT(x) x = 0xffff | |
105 | ||
8805eea2 MZ |
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 | */ | |
1da177e4 LT |
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 | |
59ae1d12 | 128 | skb_put_data(skb, &pkt_delim, 1); |
1da177e4 LT |
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: | |
59ae1d12 | 138 | skb_put_data(skb, &esc_c0, 2); |
1da177e4 LT |
139 | break; |
140 | case 0xdb: | |
59ae1d12 | 141 | skb_put_data(skb, &esc_db, 2); |
1da177e4 LT |
142 | break; |
143 | default: | |
59ae1d12 | 144 | skb_put_data(skb, &c, 1); |
1da177e4 LT |
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 | ||
618e8bc2 | 158 | switch (hci_skb_pkt_type(skb)) { |
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, | |
8083ad1c | 178 | int len, int pkt_type) |
1da177e4 LT |
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 | 216 | u8 desc = *(data + HCI_COMMAND_HDR_SIZE); |
8083ad1c | 217 | |
1da177e4 LT |
218 | if ((desc & 0xf0) == 0xc0) { |
219 | data += HCI_COMMAND_HDR_SIZE + 1; | |
220 | len -= HCI_COMMAND_HDR_SIZE + 1; | |
221 | chan = desc & 0x0f; | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
226 | /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2 | |
8805eea2 MZ |
227 | * (because bytes 0xc0 and 0xdb are escaped, worst case is |
228 | * when the packet is all made of 0xc0 and 0xdb :) ) | |
229 | * + 2 (0xc0 delimiters at start and end). | |
230 | */ | |
1da177e4 LT |
231 | |
232 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); | |
233 | if (!nskb) | |
234 | return NULL; | |
235 | ||
618e8bc2 | 236 | hci_skb_pkt_type(nskb) = pkt_type; |
1da177e4 LT |
237 | |
238 | bcsp_slip_msgdelim(nskb); | |
239 | ||
240 | hdr[0] = bcsp->rxseq_txack << 3; | |
241 | bcsp->txack_req = 0; | |
242 | BT_DBG("We request packet no %u to card", bcsp->rxseq_txack); | |
243 | ||
244 | if (rel) { | |
245 | hdr[0] |= 0x80 + bcsp->msgq_txseq; | |
246 | BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq); | |
dd1589a4 | 247 | bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07; |
1da177e4 | 248 | } |
20dd6f59 MH |
249 | |
250 | if (bcsp->use_crc) | |
251 | hdr[0] |= 0x40; | |
1da177e4 LT |
252 | |
253 | hdr[1] = ((len << 4) & 0xff) | chan; | |
254 | hdr[2] = len >> 4; | |
255 | hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]); | |
256 | ||
257 | /* Put BCSP header */ | |
258 | for (i = 0; i < 4; i++) { | |
259 | bcsp_slip_one_byte(nskb, hdr[i]); | |
20dd6f59 MH |
260 | |
261 | if (bcsp->use_crc) | |
262 | bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); | |
1da177e4 LT |
263 | } |
264 | ||
265 | /* Put payload */ | |
266 | for (i = 0; i < len; i++) { | |
267 | bcsp_slip_one_byte(nskb, data[i]); | |
20dd6f59 MH |
268 | |
269 | if (bcsp->use_crc) | |
270 | bcsp_crc_update(&bcsp_txmsg_crc, data[i]); | |
1da177e4 LT |
271 | } |
272 | ||
1da177e4 | 273 | /* Put CRC */ |
20dd6f59 | 274 | if (bcsp->use_crc) { |
c5ec5140 | 275 | bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc); |
8083ad1c DJ |
276 | bcsp_slip_one_byte(nskb, (u8)((bcsp_txmsg_crc >> 8) & 0x00ff)); |
277 | bcsp_slip_one_byte(nskb, (u8)(bcsp_txmsg_crc & 0x00ff)); | |
20dd6f59 | 278 | } |
1da177e4 LT |
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; | |
8805eea2 | 290 | |
1da177e4 | 291 | /* First of all, check for unreliable messages in the queue, |
8083ad1c DJ |
292 | * since they have priority |
293 | */ | |
1da177e4 | 294 | |
a08b15e6 VI |
295 | skb = skb_dequeue(&bcsp->unrel); |
296 | if (skb != NULL) { | |
618e8bc2 MH |
297 | struct sk_buff *nskb; |
298 | ||
299 | nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, | |
300 | hci_skb_pkt_type(skb)); | |
1da177e4 LT |
301 | if (nskb) { |
302 | kfree_skb(skb); | |
303 | return nskb; | |
304 | } else { | |
305 | skb_queue_head(&bcsp->unrel, skb); | |
306 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
307 | } | |
308 | } | |
309 | ||
310 | /* Now, try to send a reliable pkt. We can only send a | |
8805eea2 MZ |
311 | * reliable packet if the number of packets sent but not yet ack'ed |
312 | * is < than the winsize | |
313 | */ | |
1da177e4 | 314 | |
f89d75f2 | 315 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 | 316 | |
a08b15e6 VI |
317 | if (bcsp->unack.qlen < BCSP_TXWINSIZE) { |
318 | skb = skb_dequeue(&bcsp->rel); | |
319 | if (skb != NULL) { | |
618e8bc2 MH |
320 | struct sk_buff *nskb; |
321 | ||
322 | nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, | |
323 | hci_skb_pkt_type(skb)); | |
a08b15e6 VI |
324 | if (nskb) { |
325 | __skb_queue_tail(&bcsp->unack, skb); | |
326 | mod_timer(&bcsp->tbcsp, jiffies + HZ / 4); | |
327 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
328 | return nskb; | |
329 | } else { | |
330 | skb_queue_head(&bcsp->rel, skb); | |
331 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
332 | } | |
1da177e4 LT |
333 | } |
334 | } | |
335 | ||
336 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
337 | ||
1da177e4 | 338 | /* We could not send a reliable packet, either because there are |
8805eea2 MZ |
339 | * none or because there are too many unack'ed pkts. Did we receive |
340 | * any packets we have not acknowledged yet ? | |
341 | */ | |
1da177e4 LT |
342 | |
343 | if (bcsp->txack_req) { | |
344 | /* if so, craft an empty ACK pkt and send it on BCSP unreliable | |
8805eea2 MZ |
345 | * channel 0 |
346 | */ | |
1da177e4 LT |
347 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT); |
348 | return nskb; | |
349 | } | |
350 | ||
351 | /* We have nothing to send */ | |
352 | return NULL; | |
353 | } | |
354 | ||
355 | static int bcsp_flush(struct hci_uart *hu) | |
356 | { | |
357 | BT_DBG("hu %p", hu); | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /* Remove ack'ed packets */ | |
362 | static void bcsp_pkt_cull(struct bcsp_struct *bcsp) | |
363 | { | |
8fc5387c | 364 | struct sk_buff *skb, *tmp; |
1da177e4 | 365 | unsigned long flags; |
1da177e4 LT |
366 | int i, pkts_to_be_removed; |
367 | u8 seqno; | |
368 | ||
369 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
370 | ||
8fc5387c | 371 | pkts_to_be_removed = skb_queue_len(&bcsp->unack); |
1da177e4 LT |
372 | seqno = bcsp->msgq_txseq; |
373 | ||
374 | while (pkts_to_be_removed) { | |
375 | if (bcsp->rxack == seqno) | |
376 | break; | |
377 | pkts_to_be_removed--; | |
378 | seqno = (seqno - 1) & 0x07; | |
379 | } | |
380 | ||
381 | if (bcsp->rxack != seqno) | |
382 | BT_ERR("Peer acked invalid packet"); | |
383 | ||
384 | BT_DBG("Removing %u pkts out of %u, up to seqno %u", | |
8fc5387c DM |
385 | pkts_to_be_removed, skb_queue_len(&bcsp->unack), |
386 | (seqno - 1) & 0x07); | |
1da177e4 | 387 | |
8fc5387c DM |
388 | i = 0; |
389 | skb_queue_walk_safe(&bcsp->unack, skb, tmp) { | |
d2e353f7 | 390 | if (i >= pkts_to_be_removed) |
8fc5387c | 391 | break; |
d2e353f7 | 392 | i++; |
1da177e4 | 393 | |
1da177e4 LT |
394 | __skb_unlink(skb, &bcsp->unack); |
395 | kfree_skb(skb); | |
1da177e4 | 396 | } |
0372a662 | 397 | |
8fc5387c | 398 | if (skb_queue_empty(&bcsp->unack)) |
1da177e4 | 399 | del_timer(&bcsp->tbcsp); |
0372a662 | 400 | |
1da177e4 LT |
401 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); |
402 | ||
403 | if (i != pkts_to_be_removed) | |
404 | BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed); | |
405 | } | |
406 | ||
407 | /* Handle BCSP link-establishment packets. When we | |
8805eea2 MZ |
408 | * detect a "sync" packet, symptom that the BT module has reset, |
409 | * we do nothing :) (yet) | |
410 | */ | |
1da177e4 LT |
411 | static void bcsp_handle_le_pkt(struct hci_uart *hu) |
412 | { | |
413 | struct bcsp_struct *bcsp = hu->priv; | |
414 | u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed }; | |
415 | u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 }; | |
416 | u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed }; | |
417 | ||
418 | /* spot "conf" pkts and reply with a "conf rsp" pkt */ | |
419 | if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
8083ad1c | 420 | !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) { |
1da177e4 LT |
421 | struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC); |
422 | ||
423 | BT_DBG("Found a LE conf pkt"); | |
424 | if (!nskb) | |
425 | return; | |
59ae1d12 | 426 | skb_put_data(nskb, conf_rsp_pkt, 4); |
618e8bc2 | 427 | hci_skb_pkt_type(nskb) = BCSP_LE_PKT; |
1da177e4 LT |
428 | |
429 | skb_queue_head(&bcsp->unrel, nskb); | |
430 | hci_uart_tx_wakeup(hu); | |
431 | } | |
432 | /* Spot "sync" pkts. If we find one...disaster! */ | |
433 | else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
8083ad1c | 434 | !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) { |
1da177e4 LT |
435 | BT_ERR("Found a LE sync pkt, card has reset"); |
436 | } | |
437 | } | |
438 | ||
439 | static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte) | |
440 | { | |
441 | const u8 c0 = 0xc0, db = 0xdb; | |
442 | ||
443 | switch (bcsp->rx_esc_state) { | |
444 | case BCSP_ESCSTATE_NOESC: | |
445 | switch (byte) { | |
446 | case 0xdb: | |
447 | bcsp->rx_esc_state = BCSP_ESCSTATE_ESC; | |
448 | break; | |
449 | default: | |
59ae1d12 | 450 | skb_put_data(bcsp->rx_skb, &byte, 1); |
fe8de008 | 451 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 452 | bcsp->rx_state != BCSP_W4_CRC) |
1da177e4 LT |
453 | bcsp_crc_update(&bcsp->message_crc, byte); |
454 | bcsp->rx_count--; | |
455 | } | |
456 | break; | |
457 | ||
458 | case BCSP_ESCSTATE_ESC: | |
459 | switch (byte) { | |
460 | case 0xdc: | |
59ae1d12 | 461 | skb_put_data(bcsp->rx_skb, &c0, 1); |
fe8de008 | 462 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 463 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 464 | bcsp_crc_update(&bcsp->message_crc, 0xc0); |
1da177e4 LT |
465 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
466 | bcsp->rx_count--; | |
467 | break; | |
468 | ||
469 | case 0xdd: | |
59ae1d12 | 470 | skb_put_data(bcsp->rx_skb, &db, 1); |
fe8de008 | 471 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 472 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 473 | bcsp_crc_update(&bcsp->message_crc, 0xdb); |
1da177e4 LT |
474 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
475 | bcsp->rx_count--; | |
476 | break; | |
477 | ||
478 | default: | |
fe8de008 | 479 | BT_ERR("Invalid byte %02x after esc byte", byte); |
1da177e4 LT |
480 | kfree_skb(bcsp->rx_skb); |
481 | bcsp->rx_skb = NULL; | |
482 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
483 | bcsp->rx_count = 0; | |
484 | } | |
485 | } | |
486 | } | |
487 | ||
858119e1 | 488 | static void bcsp_complete_rx_pkt(struct hci_uart *hu) |
1da177e4 LT |
489 | { |
490 | struct bcsp_struct *bcsp = hu->priv; | |
37332ddc | 491 | int pass_up = 0; |
1da177e4 LT |
492 | |
493 | if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */ | |
494 | BT_DBG("Received seqno %u from card", bcsp->rxseq_txack); | |
37332ddc DJ |
495 | |
496 | /* check the rx sequence number is as expected */ | |
497 | if ((bcsp->rx_skb->data[0] & 0x07) == bcsp->rxseq_txack) { | |
498 | bcsp->rxseq_txack++; | |
499 | bcsp->rxseq_txack %= 0x8; | |
500 | } else { | |
501 | /* handle re-transmitted packet or | |
502 | * when packet was missed | |
503 | */ | |
504 | BT_ERR("Out-of-order packet arrived, got %u expected %u", | |
505 | bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack); | |
506 | ||
507 | /* do not process out-of-order packet payload */ | |
508 | pass_up = 2; | |
509 | } | |
510 | ||
511 | /* send current txack value to all received reliable packets */ | |
512 | bcsp->txack_req = 1; | |
1da177e4 LT |
513 | |
514 | /* If needed, transmit an ack pkt */ | |
515 | hci_uart_tx_wakeup(hu); | |
516 | } | |
517 | ||
518 | bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07; | |
519 | BT_DBG("Request for pkt %u from card", bcsp->rxack); | |
520 | ||
37332ddc DJ |
521 | /* handle received ACK indications, |
522 | * including those from out-of-order packets | |
523 | */ | |
1da177e4 | 524 | bcsp_pkt_cull(bcsp); |
37332ddc DJ |
525 | |
526 | if (pass_up != 2) { | |
527 | if ((bcsp->rx_skb->data[1] & 0x0f) == 6 && | |
528 | (bcsp->rx_skb->data[0] & 0x80)) { | |
529 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_ACLDATA_PKT; | |
530 | pass_up = 1; | |
531 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && | |
532 | (bcsp->rx_skb->data[0] & 0x80)) { | |
533 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; | |
534 | pass_up = 1; | |
535 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { | |
536 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_SCODATA_PKT; | |
537 | pass_up = 1; | |
538 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 && | |
539 | !(bcsp->rx_skb->data[0] & 0x80)) { | |
540 | bcsp_handle_le_pkt(hu); | |
541 | pass_up = 0; | |
542 | } else { | |
543 | pass_up = 0; | |
544 | } | |
545 | } | |
546 | ||
547 | if (pass_up == 0) { | |
1da177e4 LT |
548 | struct hci_event_hdr hdr; |
549 | u8 desc = (bcsp->rx_skb->data[1] & 0x0f); | |
550 | ||
551 | if (desc != 0 && desc != 1) { | |
552 | if (hciextn) { | |
553 | desc |= 0xc0; | |
554 | skb_pull(bcsp->rx_skb, 4); | |
555 | memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1); | |
556 | ||
557 | hdr.evt = 0xff; | |
558 | hdr.plen = bcsp->rx_skb->len; | |
559 | memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE); | |
618e8bc2 | 560 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; |
1da177e4 | 561 | |
e1a26170 | 562 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
1da177e4 | 563 | } else { |
fe8de008 | 564 | BT_ERR("Packet for unknown channel (%u %s)", |
8083ad1c DJ |
565 | bcsp->rx_skb->data[1] & 0x0f, |
566 | bcsp->rx_skb->data[0] & 0x80 ? | |
567 | "reliable" : "unreliable"); | |
1da177e4 LT |
568 | kfree_skb(bcsp->rx_skb); |
569 | } | |
570 | } else | |
571 | kfree_skb(bcsp->rx_skb); | |
37332ddc | 572 | } else if (pass_up == 1) { |
1da177e4 LT |
573 | /* Pull out BCSP hdr */ |
574 | skb_pull(bcsp->rx_skb, 4); | |
575 | ||
e1a26170 | 576 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
37332ddc DJ |
577 | } else { |
578 | /* ignore packet payload of already ACKed re-transmitted | |
579 | * packets or when a packet was missed in the BCSP window | |
580 | */ | |
581 | kfree_skb(bcsp->rx_skb); | |
1da177e4 | 582 | } |
0372a662 | 583 | |
1da177e4 LT |
584 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
585 | bcsp->rx_skb = NULL; | |
586 | } | |
587 | ||
c5ec5140 HH |
588 | static u16 bscp_get_crc(struct bcsp_struct *bcsp) |
589 | { | |
590 | return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]); | |
591 | } | |
592 | ||
1da177e4 | 593 | /* Recv data */ |
9d1c40eb | 594 | static int bcsp_recv(struct hci_uart *hu, const void *data, int count) |
1da177e4 LT |
595 | { |
596 | struct bcsp_struct *bcsp = hu->priv; | |
9d1c40eb | 597 | const unsigned char *ptr; |
1da177e4 | 598 | |
8805eea2 | 599 | BT_DBG("hu %p count %d rx_state %d rx_count %ld", |
8083ad1c | 600 | hu, count, bcsp->rx_state, bcsp->rx_count); |
1da177e4 LT |
601 | |
602 | ptr = data; | |
603 | while (count) { | |
604 | if (bcsp->rx_count) { | |
605 | if (*ptr == 0xc0) { | |
606 | BT_ERR("Short BCSP packet"); | |
607 | kfree_skb(bcsp->rx_skb); | |
608 | bcsp->rx_state = BCSP_W4_PKT_START; | |
609 | bcsp->rx_count = 0; | |
610 | } else | |
611 | bcsp_unslip_one_byte(bcsp, *ptr); | |
612 | ||
613 | ptr++; count--; | |
614 | continue; | |
615 | } | |
616 | ||
617 | switch (bcsp->rx_state) { | |
618 | case BCSP_W4_BCSP_HDR: | |
8083ad1c DJ |
619 | if ((0xff & (u8)~(bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] + |
620 | bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { | |
1da177e4 LT |
621 | BT_ERR("Error in BCSP hdr checksum"); |
622 | kfree_skb(bcsp->rx_skb); | |
623 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
624 | bcsp->rx_count = 0; | |
625 | continue; | |
626 | } | |
1da177e4 | 627 | bcsp->rx_state = BCSP_W4_DATA; |
8805eea2 | 628 | bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) + |
1da177e4 LT |
629 | (bcsp->rx_skb->data[2] << 4); /* May be 0 */ |
630 | continue; | |
631 | ||
632 | case BCSP_W4_DATA: | |
633 | if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */ | |
634 | bcsp->rx_state = BCSP_W4_CRC; | |
635 | bcsp->rx_count = 2; | |
636 | } else | |
637 | bcsp_complete_rx_pkt(hu); | |
638 | continue; | |
639 | ||
640 | case BCSP_W4_CRC: | |
c5ec5140 | 641 | if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) { |
8805eea2 | 642 | BT_ERR("Checksum failed: computed %04x received %04x", |
8083ad1c DJ |
643 | bitrev16(bcsp->message_crc), |
644 | bscp_get_crc(bcsp)); | |
1da177e4 LT |
645 | |
646 | kfree_skb(bcsp->rx_skb); | |
647 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
648 | bcsp->rx_count = 0; | |
649 | continue; | |
650 | } | |
651 | skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2); | |
652 | bcsp_complete_rx_pkt(hu); | |
653 | continue; | |
654 | ||
655 | case BCSP_W4_PKT_DELIMITER: | |
656 | switch (*ptr) { | |
657 | case 0xc0: | |
658 | bcsp->rx_state = BCSP_W4_PKT_START; | |
659 | break; | |
660 | default: | |
661 | /*BT_ERR("Ignoring byte %02x", *ptr);*/ | |
662 | break; | |
663 | } | |
664 | ptr++; count--; | |
665 | break; | |
666 | ||
667 | case BCSP_W4_PKT_START: | |
668 | switch (*ptr) { | |
669 | case 0xc0: | |
670 | ptr++; count--; | |
671 | break; | |
672 | ||
673 | default: | |
674 | bcsp->rx_state = BCSP_W4_BCSP_HDR; | |
675 | bcsp->rx_count = 4; | |
676 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
677 | BCSP_CRC_INIT(bcsp->message_crc); | |
0372a662 | 678 | |
1da177e4 | 679 | /* Do not increment ptr or decrement count |
8805eea2 MZ |
680 | * Allocate packet. Max len of a BCSP pkt= |
681 | * 0xFFF (payload) +4 (header) +2 (crc) | |
682 | */ | |
1da177e4 LT |
683 | |
684 | bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC); | |
685 | if (!bcsp->rx_skb) { | |
686 | BT_ERR("Can't allocate mem for new packet"); | |
687 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
688 | bcsp->rx_count = 0; | |
689 | return 0; | |
690 | } | |
1da177e4 LT |
691 | break; |
692 | } | |
693 | break; | |
694 | } | |
695 | } | |
696 | return count; | |
697 | } | |
698 | ||
699 | /* Arrange to retransmit all messages in the relq. */ | |
700 | static void bcsp_timed_event(unsigned long arg) | |
701 | { | |
8083ad1c | 702 | struct hci_uart *hu = (struct hci_uart *)arg; |
1da177e4 LT |
703 | struct bcsp_struct *bcsp = hu->priv; |
704 | struct sk_buff *skb; | |
705 | unsigned long flags; | |
706 | ||
707 | BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen); | |
708 | ||
f89d75f2 | 709 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
710 | |
711 | while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) { | |
712 | bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07; | |
713 | skb_queue_head(&bcsp->rel, skb); | |
714 | } | |
715 | ||
716 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
717 | ||
718 | hci_uart_tx_wakeup(hu); | |
719 | } | |
720 | ||
721 | static int bcsp_open(struct hci_uart *hu) | |
722 | { | |
723 | struct bcsp_struct *bcsp; | |
724 | ||
725 | BT_DBG("hu %p", hu); | |
726 | ||
c063af34 | 727 | bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL); |
1da177e4 LT |
728 | if (!bcsp) |
729 | return -ENOMEM; | |
1da177e4 LT |
730 | |
731 | hu->priv = bcsp; | |
732 | skb_queue_head_init(&bcsp->unack); | |
733 | skb_queue_head_init(&bcsp->rel); | |
734 | skb_queue_head_init(&bcsp->unrel); | |
735 | ||
6e5ffd0f | 736 | setup_timer(&bcsp->tbcsp, bcsp_timed_event, (u_long)hu); |
1da177e4 LT |
737 | |
738 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
739 | ||
20dd6f59 MH |
740 | if (txcrc) |
741 | bcsp->use_crc = 1; | |
742 | ||
1da177e4 LT |
743 | return 0; |
744 | } | |
745 | ||
746 | static int bcsp_close(struct hci_uart *hu) | |
747 | { | |
748 | struct bcsp_struct *bcsp = hu->priv; | |
c327cddd MK |
749 | |
750 | del_timer_sync(&bcsp->tbcsp); | |
751 | ||
1da177e4 LT |
752 | hu->priv = NULL; |
753 | ||
754 | BT_DBG("hu %p", hu); | |
755 | ||
756 | skb_queue_purge(&bcsp->unack); | |
757 | skb_queue_purge(&bcsp->rel); | |
758 | skb_queue_purge(&bcsp->unrel); | |
1da177e4 LT |
759 | |
760 | kfree(bcsp); | |
761 | return 0; | |
762 | } | |
763 | ||
4ee7ef19 | 764 | static const struct hci_uart_proto bcsp = { |
0372a662 | 765 | .id = HCI_UART_BCSP, |
7c40fb8d | 766 | .name = "BCSP", |
0372a662 MH |
767 | .open = bcsp_open, |
768 | .close = bcsp_close, | |
769 | .enqueue = bcsp_enqueue, | |
770 | .dequeue = bcsp_dequeue, | |
771 | .recv = bcsp_recv, | |
772 | .flush = bcsp_flush | |
1da177e4 LT |
773 | }; |
774 | ||
f2b94bb9 | 775 | int __init bcsp_init(void) |
1da177e4 | 776 | { |
01009eec | 777 | return hci_uart_register_proto(&bcsp); |
1da177e4 LT |
778 | } |
779 | ||
f2b94bb9 | 780 | int __exit bcsp_deinit(void) |
1da177e4 LT |
781 | { |
782 | return hci_uart_unregister_proto(&bcsp); | |
783 | } | |
784 | ||
20dd6f59 MH |
785 | module_param(txcrc, bool, 0644); |
786 | MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet"); | |
787 | ||
1da177e4 LT |
788 | module_param(hciextn, bool, 0644); |
789 | MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets"); |