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; | |
04356052 | 68 | struct hci_uart *hu; |
0372a662 MH |
69 | |
70 | enum { | |
71 | BCSP_W4_PKT_DELIMITER, | |
72 | BCSP_W4_PKT_START, | |
73 | BCSP_W4_BCSP_HDR, | |
74 | BCSP_W4_DATA, | |
75 | BCSP_W4_CRC | |
76 | } rx_state; | |
77 | ||
78 | enum { | |
79 | BCSP_ESCSTATE_NOESC, | |
80 | BCSP_ESCSTATE_ESC | |
81 | } rx_esc_state; | |
82 | ||
83 | u8 use_crc; | |
84 | u16 message_crc; | |
85 | u8 txack_req; /* Do we need to send ack's to the peer? */ | |
86 | ||
87 | /* Reliable packet sequence number - used to assign seq to each rel pkt. */ | |
88 | u8 msgq_txseq; | |
89 | }; | |
90 | ||
1da177e4 LT |
91 | /* ---- BCSP CRC calculation ---- */ |
92 | ||
93 | /* Table for calculating CRC for polynomial 0x1021, LSB processed first, | |
8083ad1c DJ |
94 | * initial value 0xffff, bits shifted in reverse order. |
95 | */ | |
1da177e4 LT |
96 | |
97 | static const u16 crc_table[] = { | |
98 | 0x0000, 0x1081, 0x2102, 0x3183, | |
99 | 0x4204, 0x5285, 0x6306, 0x7387, | |
100 | 0x8408, 0x9489, 0xa50a, 0xb58b, | |
101 | 0xc60c, 0xd68d, 0xe70e, 0xf78f | |
102 | }; | |
103 | ||
104 | /* Initialise the crc calculator */ | |
105 | #define BCSP_CRC_INIT(x) x = 0xffff | |
106 | ||
8805eea2 MZ |
107 | /* Update crc with next data byte |
108 | * | |
109 | * Implementation note | |
110 | * The data byte is treated as two nibbles. The crc is generated | |
111 | * in reverse, i.e., bits are fed into the register from the top. | |
112 | */ | |
1da177e4 LT |
113 | static void bcsp_crc_update(u16 *crc, u8 d) |
114 | { | |
115 | u16 reg = *crc; | |
116 | ||
117 | reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f]; | |
118 | reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f]; | |
119 | ||
120 | *crc = reg; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | /* ---- BCSP core ---- */ |
124 | ||
125 | static void bcsp_slip_msgdelim(struct sk_buff *skb) | |
126 | { | |
127 | const char pkt_delim = 0xc0; | |
0372a662 | 128 | |
59ae1d12 | 129 | skb_put_data(skb, &pkt_delim, 1); |
1da177e4 LT |
130 | } |
131 | ||
132 | static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c) | |
133 | { | |
134 | const char esc_c0[2] = { 0xdb, 0xdc }; | |
135 | const char esc_db[2] = { 0xdb, 0xdd }; | |
136 | ||
137 | switch (c) { | |
138 | case 0xc0: | |
59ae1d12 | 139 | skb_put_data(skb, &esc_c0, 2); |
1da177e4 LT |
140 | break; |
141 | case 0xdb: | |
59ae1d12 | 142 | skb_put_data(skb, &esc_db, 2); |
1da177e4 LT |
143 | break; |
144 | default: | |
59ae1d12 | 145 | skb_put_data(skb, &c, 1); |
1da177e4 LT |
146 | } |
147 | } | |
148 | ||
149 | static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
150 | { | |
151 | struct bcsp_struct *bcsp = hu->priv; | |
152 | ||
153 | if (skb->len > 0xFFF) { | |
154 | BT_ERR("Packet too long"); | |
155 | kfree_skb(skb); | |
156 | return 0; | |
157 | } | |
158 | ||
618e8bc2 | 159 | switch (hci_skb_pkt_type(skb)) { |
1da177e4 LT |
160 | case HCI_ACLDATA_PKT: |
161 | case HCI_COMMAND_PKT: | |
162 | skb_queue_tail(&bcsp->rel, skb); | |
163 | break; | |
164 | ||
165 | case HCI_SCODATA_PKT: | |
166 | skb_queue_tail(&bcsp->unrel, skb); | |
167 | break; | |
168 | ||
169 | default: | |
170 | BT_ERR("Unknown packet type"); | |
171 | kfree_skb(skb); | |
172 | break; | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, | |
8083ad1c | 179 | int len, int pkt_type) |
1da177e4 LT |
180 | { |
181 | struct sk_buff *nskb; | |
182 | u8 hdr[4], chan; | |
1da177e4 | 183 | u16 BCSP_CRC_INIT(bcsp_txmsg_crc); |
20dd6f59 | 184 | int rel, i; |
1da177e4 LT |
185 | |
186 | switch (pkt_type) { | |
187 | case HCI_ACLDATA_PKT: | |
188 | chan = 6; /* BCSP ACL channel */ | |
189 | rel = 1; /* reliable channel */ | |
190 | break; | |
191 | case HCI_COMMAND_PKT: | |
192 | chan = 5; /* BCSP cmd/evt channel */ | |
193 | rel = 1; /* reliable channel */ | |
194 | break; | |
195 | case HCI_SCODATA_PKT: | |
196 | chan = 7; /* BCSP SCO channel */ | |
197 | rel = 0; /* unreliable channel */ | |
198 | break; | |
199 | case BCSP_LE_PKT: | |
200 | chan = 1; /* BCSP LE channel */ | |
201 | rel = 0; /* unreliable channel */ | |
202 | break; | |
203 | case BCSP_ACK_PKT: | |
204 | chan = 0; /* BCSP internal channel */ | |
205 | rel = 0; /* unreliable channel */ | |
206 | break; | |
207 | default: | |
208 | BT_ERR("Unknown packet type"); | |
209 | return NULL; | |
210 | } | |
211 | ||
212 | if (hciextn && chan == 5) { | |
c5ec5140 | 213 | __le16 opcode = ((struct hci_command_hdr *)data)->opcode; |
1da177e4 | 214 | |
a9de9248 | 215 | /* Vendor specific commands */ |
c5ec5140 | 216 | if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) { |
1da177e4 | 217 | u8 desc = *(data + HCI_COMMAND_HDR_SIZE); |
8083ad1c | 218 | |
1da177e4 LT |
219 | if ((desc & 0xf0) == 0xc0) { |
220 | data += HCI_COMMAND_HDR_SIZE + 1; | |
221 | len -= HCI_COMMAND_HDR_SIZE + 1; | |
222 | chan = desc & 0x0f; | |
223 | } | |
224 | } | |
225 | } | |
226 | ||
227 | /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2 | |
8805eea2 MZ |
228 | * (because bytes 0xc0 and 0xdb are escaped, worst case is |
229 | * when the packet is all made of 0xc0 and 0xdb :) ) | |
230 | * + 2 (0xc0 delimiters at start and end). | |
231 | */ | |
1da177e4 LT |
232 | |
233 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); | |
234 | if (!nskb) | |
235 | return NULL; | |
236 | ||
618e8bc2 | 237 | hci_skb_pkt_type(nskb) = pkt_type; |
1da177e4 LT |
238 | |
239 | bcsp_slip_msgdelim(nskb); | |
240 | ||
241 | hdr[0] = bcsp->rxseq_txack << 3; | |
242 | bcsp->txack_req = 0; | |
243 | BT_DBG("We request packet no %u to card", bcsp->rxseq_txack); | |
244 | ||
245 | if (rel) { | |
246 | hdr[0] |= 0x80 + bcsp->msgq_txseq; | |
247 | BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq); | |
dd1589a4 | 248 | bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07; |
1da177e4 | 249 | } |
20dd6f59 MH |
250 | |
251 | if (bcsp->use_crc) | |
252 | hdr[0] |= 0x40; | |
1da177e4 LT |
253 | |
254 | hdr[1] = ((len << 4) & 0xff) | chan; | |
255 | hdr[2] = len >> 4; | |
256 | hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]); | |
257 | ||
258 | /* Put BCSP header */ | |
259 | for (i = 0; i < 4; i++) { | |
260 | bcsp_slip_one_byte(nskb, hdr[i]); | |
20dd6f59 MH |
261 | |
262 | if (bcsp->use_crc) | |
263 | bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); | |
1da177e4 LT |
264 | } |
265 | ||
266 | /* Put payload */ | |
267 | for (i = 0; i < len; i++) { | |
268 | bcsp_slip_one_byte(nskb, data[i]); | |
20dd6f59 MH |
269 | |
270 | if (bcsp->use_crc) | |
271 | bcsp_crc_update(&bcsp_txmsg_crc, data[i]); | |
1da177e4 LT |
272 | } |
273 | ||
1da177e4 | 274 | /* Put CRC */ |
20dd6f59 | 275 | if (bcsp->use_crc) { |
c5ec5140 | 276 | bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc); |
8083ad1c DJ |
277 | bcsp_slip_one_byte(nskb, (u8)((bcsp_txmsg_crc >> 8) & 0x00ff)); |
278 | bcsp_slip_one_byte(nskb, (u8)(bcsp_txmsg_crc & 0x00ff)); | |
20dd6f59 | 279 | } |
1da177e4 LT |
280 | |
281 | bcsp_slip_msgdelim(nskb); | |
282 | return nskb; | |
283 | } | |
284 | ||
285 | /* This is a rewrite of pkt_avail in ABCSP */ | |
286 | static struct sk_buff *bcsp_dequeue(struct hci_uart *hu) | |
287 | { | |
288 | struct bcsp_struct *bcsp = hu->priv; | |
289 | unsigned long flags; | |
290 | struct sk_buff *skb; | |
8805eea2 | 291 | |
1da177e4 | 292 | /* First of all, check for unreliable messages in the queue, |
8083ad1c DJ |
293 | * since they have priority |
294 | */ | |
1da177e4 | 295 | |
a08b15e6 VI |
296 | skb = skb_dequeue(&bcsp->unrel); |
297 | if (skb != NULL) { | |
618e8bc2 MH |
298 | struct sk_buff *nskb; |
299 | ||
300 | nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, | |
301 | hci_skb_pkt_type(skb)); | |
1da177e4 LT |
302 | if (nskb) { |
303 | kfree_skb(skb); | |
304 | return nskb; | |
305 | } else { | |
306 | skb_queue_head(&bcsp->unrel, skb); | |
307 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
308 | } | |
309 | } | |
310 | ||
311 | /* Now, try to send a reliable pkt. We can only send a | |
8805eea2 MZ |
312 | * reliable packet if the number of packets sent but not yet ack'ed |
313 | * is < than the winsize | |
314 | */ | |
1da177e4 | 315 | |
f89d75f2 | 316 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 | 317 | |
a08b15e6 VI |
318 | if (bcsp->unack.qlen < BCSP_TXWINSIZE) { |
319 | skb = skb_dequeue(&bcsp->rel); | |
320 | if (skb != NULL) { | |
618e8bc2 MH |
321 | struct sk_buff *nskb; |
322 | ||
323 | nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, | |
324 | hci_skb_pkt_type(skb)); | |
a08b15e6 VI |
325 | if (nskb) { |
326 | __skb_queue_tail(&bcsp->unack, skb); | |
327 | mod_timer(&bcsp->tbcsp, jiffies + HZ / 4); | |
328 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
329 | return nskb; | |
330 | } else { | |
331 | skb_queue_head(&bcsp->rel, skb); | |
332 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
333 | } | |
1da177e4 LT |
334 | } |
335 | } | |
336 | ||
337 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
338 | ||
1da177e4 | 339 | /* We could not send a reliable packet, either because there are |
8805eea2 MZ |
340 | * none or because there are too many unack'ed pkts. Did we receive |
341 | * any packets we have not acknowledged yet ? | |
342 | */ | |
1da177e4 LT |
343 | |
344 | if (bcsp->txack_req) { | |
345 | /* if so, craft an empty ACK pkt and send it on BCSP unreliable | |
8805eea2 MZ |
346 | * channel 0 |
347 | */ | |
1da177e4 LT |
348 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT); |
349 | return nskb; | |
350 | } | |
351 | ||
352 | /* We have nothing to send */ | |
353 | return NULL; | |
354 | } | |
355 | ||
356 | static int bcsp_flush(struct hci_uart *hu) | |
357 | { | |
358 | BT_DBG("hu %p", hu); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /* Remove ack'ed packets */ | |
363 | static void bcsp_pkt_cull(struct bcsp_struct *bcsp) | |
364 | { | |
8fc5387c | 365 | struct sk_buff *skb, *tmp; |
1da177e4 | 366 | unsigned long flags; |
1da177e4 LT |
367 | int i, pkts_to_be_removed; |
368 | u8 seqno; | |
369 | ||
370 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
371 | ||
8fc5387c | 372 | pkts_to_be_removed = skb_queue_len(&bcsp->unack); |
1da177e4 LT |
373 | seqno = bcsp->msgq_txseq; |
374 | ||
375 | while (pkts_to_be_removed) { | |
376 | if (bcsp->rxack == seqno) | |
377 | break; | |
378 | pkts_to_be_removed--; | |
379 | seqno = (seqno - 1) & 0x07; | |
380 | } | |
381 | ||
382 | if (bcsp->rxack != seqno) | |
383 | BT_ERR("Peer acked invalid packet"); | |
384 | ||
385 | BT_DBG("Removing %u pkts out of %u, up to seqno %u", | |
8fc5387c DM |
386 | pkts_to_be_removed, skb_queue_len(&bcsp->unack), |
387 | (seqno - 1) & 0x07); | |
1da177e4 | 388 | |
8fc5387c DM |
389 | i = 0; |
390 | skb_queue_walk_safe(&bcsp->unack, skb, tmp) { | |
d2e353f7 | 391 | if (i >= pkts_to_be_removed) |
8fc5387c | 392 | break; |
d2e353f7 | 393 | i++; |
1da177e4 | 394 | |
1da177e4 LT |
395 | __skb_unlink(skb, &bcsp->unack); |
396 | kfree_skb(skb); | |
1da177e4 | 397 | } |
0372a662 | 398 | |
8fc5387c | 399 | if (skb_queue_empty(&bcsp->unack)) |
1da177e4 | 400 | del_timer(&bcsp->tbcsp); |
0372a662 | 401 | |
1da177e4 LT |
402 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); |
403 | ||
404 | if (i != pkts_to_be_removed) | |
405 | BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed); | |
406 | } | |
407 | ||
408 | /* Handle BCSP link-establishment packets. When we | |
8805eea2 MZ |
409 | * detect a "sync" packet, symptom that the BT module has reset, |
410 | * we do nothing :) (yet) | |
411 | */ | |
1da177e4 LT |
412 | static void bcsp_handle_le_pkt(struct hci_uart *hu) |
413 | { | |
414 | struct bcsp_struct *bcsp = hu->priv; | |
415 | u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed }; | |
416 | u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 }; | |
417 | u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed }; | |
418 | ||
419 | /* spot "conf" pkts and reply with a "conf rsp" pkt */ | |
420 | if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
8083ad1c | 421 | !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) { |
1da177e4 LT |
422 | struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC); |
423 | ||
424 | BT_DBG("Found a LE conf pkt"); | |
425 | if (!nskb) | |
426 | return; | |
59ae1d12 | 427 | skb_put_data(nskb, conf_rsp_pkt, 4); |
618e8bc2 | 428 | hci_skb_pkt_type(nskb) = BCSP_LE_PKT; |
1da177e4 LT |
429 | |
430 | skb_queue_head(&bcsp->unrel, nskb); | |
431 | hci_uart_tx_wakeup(hu); | |
432 | } | |
433 | /* Spot "sync" pkts. If we find one...disaster! */ | |
434 | else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
8083ad1c | 435 | !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) { |
1da177e4 LT |
436 | BT_ERR("Found a LE sync pkt, card has reset"); |
437 | } | |
438 | } | |
439 | ||
440 | static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte) | |
441 | { | |
442 | const u8 c0 = 0xc0, db = 0xdb; | |
443 | ||
444 | switch (bcsp->rx_esc_state) { | |
445 | case BCSP_ESCSTATE_NOESC: | |
446 | switch (byte) { | |
447 | case 0xdb: | |
448 | bcsp->rx_esc_state = BCSP_ESCSTATE_ESC; | |
449 | break; | |
450 | default: | |
59ae1d12 | 451 | skb_put_data(bcsp->rx_skb, &byte, 1); |
fe8de008 | 452 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 453 | bcsp->rx_state != BCSP_W4_CRC) |
1da177e4 LT |
454 | bcsp_crc_update(&bcsp->message_crc, byte); |
455 | bcsp->rx_count--; | |
456 | } | |
457 | break; | |
458 | ||
459 | case BCSP_ESCSTATE_ESC: | |
460 | switch (byte) { | |
461 | case 0xdc: | |
59ae1d12 | 462 | skb_put_data(bcsp->rx_skb, &c0, 1); |
fe8de008 | 463 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 464 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 465 | bcsp_crc_update(&bcsp->message_crc, 0xc0); |
1da177e4 LT |
466 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
467 | bcsp->rx_count--; | |
468 | break; | |
469 | ||
470 | case 0xdd: | |
59ae1d12 | 471 | skb_put_data(bcsp->rx_skb, &db, 1); |
fe8de008 | 472 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 473 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 474 | bcsp_crc_update(&bcsp->message_crc, 0xdb); |
1da177e4 LT |
475 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
476 | bcsp->rx_count--; | |
477 | break; | |
478 | ||
479 | default: | |
fe8de008 | 480 | BT_ERR("Invalid byte %02x after esc byte", byte); |
1da177e4 LT |
481 | kfree_skb(bcsp->rx_skb); |
482 | bcsp->rx_skb = NULL; | |
483 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
484 | bcsp->rx_count = 0; | |
485 | } | |
486 | } | |
487 | } | |
488 | ||
858119e1 | 489 | static void bcsp_complete_rx_pkt(struct hci_uart *hu) |
1da177e4 LT |
490 | { |
491 | struct bcsp_struct *bcsp = hu->priv; | |
37332ddc | 492 | int pass_up = 0; |
1da177e4 LT |
493 | |
494 | if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */ | |
495 | BT_DBG("Received seqno %u from card", bcsp->rxseq_txack); | |
37332ddc DJ |
496 | |
497 | /* check the rx sequence number is as expected */ | |
498 | if ((bcsp->rx_skb->data[0] & 0x07) == bcsp->rxseq_txack) { | |
499 | bcsp->rxseq_txack++; | |
500 | bcsp->rxseq_txack %= 0x8; | |
501 | } else { | |
502 | /* handle re-transmitted packet or | |
503 | * when packet was missed | |
504 | */ | |
505 | BT_ERR("Out-of-order packet arrived, got %u expected %u", | |
506 | bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack); | |
507 | ||
508 | /* do not process out-of-order packet payload */ | |
509 | pass_up = 2; | |
510 | } | |
511 | ||
512 | /* send current txack value to all received reliable packets */ | |
513 | bcsp->txack_req = 1; | |
1da177e4 LT |
514 | |
515 | /* If needed, transmit an ack pkt */ | |
516 | hci_uart_tx_wakeup(hu); | |
517 | } | |
518 | ||
519 | bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07; | |
520 | BT_DBG("Request for pkt %u from card", bcsp->rxack); | |
521 | ||
37332ddc DJ |
522 | /* handle received ACK indications, |
523 | * including those from out-of-order packets | |
524 | */ | |
1da177e4 | 525 | bcsp_pkt_cull(bcsp); |
37332ddc DJ |
526 | |
527 | if (pass_up != 2) { | |
528 | if ((bcsp->rx_skb->data[1] & 0x0f) == 6 && | |
529 | (bcsp->rx_skb->data[0] & 0x80)) { | |
530 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_ACLDATA_PKT; | |
531 | pass_up = 1; | |
532 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && | |
533 | (bcsp->rx_skb->data[0] & 0x80)) { | |
534 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; | |
535 | pass_up = 1; | |
536 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { | |
537 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_SCODATA_PKT; | |
538 | pass_up = 1; | |
539 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 && | |
540 | !(bcsp->rx_skb->data[0] & 0x80)) { | |
541 | bcsp_handle_le_pkt(hu); | |
542 | pass_up = 0; | |
543 | } else { | |
544 | pass_up = 0; | |
545 | } | |
546 | } | |
547 | ||
548 | if (pass_up == 0) { | |
1da177e4 LT |
549 | struct hci_event_hdr hdr; |
550 | u8 desc = (bcsp->rx_skb->data[1] & 0x0f); | |
551 | ||
552 | if (desc != 0 && desc != 1) { | |
553 | if (hciextn) { | |
554 | desc |= 0xc0; | |
555 | skb_pull(bcsp->rx_skb, 4); | |
556 | memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1); | |
557 | ||
558 | hdr.evt = 0xff; | |
559 | hdr.plen = bcsp->rx_skb->len; | |
560 | memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE); | |
618e8bc2 | 561 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; |
1da177e4 | 562 | |
e1a26170 | 563 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
1da177e4 | 564 | } else { |
fe8de008 | 565 | BT_ERR("Packet for unknown channel (%u %s)", |
8083ad1c DJ |
566 | bcsp->rx_skb->data[1] & 0x0f, |
567 | bcsp->rx_skb->data[0] & 0x80 ? | |
568 | "reliable" : "unreliable"); | |
1da177e4 LT |
569 | kfree_skb(bcsp->rx_skb); |
570 | } | |
571 | } else | |
572 | kfree_skb(bcsp->rx_skb); | |
37332ddc | 573 | } else if (pass_up == 1) { |
1da177e4 LT |
574 | /* Pull out BCSP hdr */ |
575 | skb_pull(bcsp->rx_skb, 4); | |
576 | ||
e1a26170 | 577 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
37332ddc DJ |
578 | } else { |
579 | /* ignore packet payload of already ACKed re-transmitted | |
580 | * packets or when a packet was missed in the BCSP window | |
581 | */ | |
582 | kfree_skb(bcsp->rx_skb); | |
1da177e4 | 583 | } |
0372a662 | 584 | |
1da177e4 LT |
585 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
586 | bcsp->rx_skb = NULL; | |
587 | } | |
588 | ||
c5ec5140 HH |
589 | static u16 bscp_get_crc(struct bcsp_struct *bcsp) |
590 | { | |
591 | return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]); | |
592 | } | |
593 | ||
1da177e4 | 594 | /* Recv data */ |
9d1c40eb | 595 | static int bcsp_recv(struct hci_uart *hu, const void *data, int count) |
1da177e4 LT |
596 | { |
597 | struct bcsp_struct *bcsp = hu->priv; | |
9d1c40eb | 598 | const unsigned char *ptr; |
1da177e4 | 599 | |
8805eea2 | 600 | BT_DBG("hu %p count %d rx_state %d rx_count %ld", |
8083ad1c | 601 | hu, count, bcsp->rx_state, bcsp->rx_count); |
1da177e4 LT |
602 | |
603 | ptr = data; | |
604 | while (count) { | |
605 | if (bcsp->rx_count) { | |
606 | if (*ptr == 0xc0) { | |
607 | BT_ERR("Short BCSP packet"); | |
608 | kfree_skb(bcsp->rx_skb); | |
609 | bcsp->rx_state = BCSP_W4_PKT_START; | |
610 | bcsp->rx_count = 0; | |
611 | } else | |
612 | bcsp_unslip_one_byte(bcsp, *ptr); | |
613 | ||
614 | ptr++; count--; | |
615 | continue; | |
616 | } | |
617 | ||
618 | switch (bcsp->rx_state) { | |
619 | case BCSP_W4_BCSP_HDR: | |
8083ad1c DJ |
620 | if ((0xff & (u8)~(bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] + |
621 | bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { | |
1da177e4 LT |
622 | BT_ERR("Error in BCSP hdr checksum"); |
623 | kfree_skb(bcsp->rx_skb); | |
624 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
625 | bcsp->rx_count = 0; | |
626 | continue; | |
627 | } | |
1da177e4 | 628 | bcsp->rx_state = BCSP_W4_DATA; |
8805eea2 | 629 | bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) + |
1da177e4 LT |
630 | (bcsp->rx_skb->data[2] << 4); /* May be 0 */ |
631 | continue; | |
632 | ||
633 | case BCSP_W4_DATA: | |
634 | if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */ | |
635 | bcsp->rx_state = BCSP_W4_CRC; | |
636 | bcsp->rx_count = 2; | |
637 | } else | |
638 | bcsp_complete_rx_pkt(hu); | |
639 | continue; | |
640 | ||
641 | case BCSP_W4_CRC: | |
c5ec5140 | 642 | if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) { |
8805eea2 | 643 | BT_ERR("Checksum failed: computed %04x received %04x", |
8083ad1c DJ |
644 | bitrev16(bcsp->message_crc), |
645 | bscp_get_crc(bcsp)); | |
1da177e4 LT |
646 | |
647 | kfree_skb(bcsp->rx_skb); | |
648 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
649 | bcsp->rx_count = 0; | |
650 | continue; | |
651 | } | |
652 | skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2); | |
653 | bcsp_complete_rx_pkt(hu); | |
654 | continue; | |
655 | ||
656 | case BCSP_W4_PKT_DELIMITER: | |
657 | switch (*ptr) { | |
658 | case 0xc0: | |
659 | bcsp->rx_state = BCSP_W4_PKT_START; | |
660 | break; | |
661 | default: | |
662 | /*BT_ERR("Ignoring byte %02x", *ptr);*/ | |
663 | break; | |
664 | } | |
665 | ptr++; count--; | |
666 | break; | |
667 | ||
668 | case BCSP_W4_PKT_START: | |
669 | switch (*ptr) { | |
670 | case 0xc0: | |
671 | ptr++; count--; | |
672 | break; | |
673 | ||
674 | default: | |
675 | bcsp->rx_state = BCSP_W4_BCSP_HDR; | |
676 | bcsp->rx_count = 4; | |
677 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; | |
678 | BCSP_CRC_INIT(bcsp->message_crc); | |
0372a662 | 679 | |
1da177e4 | 680 | /* Do not increment ptr or decrement count |
8805eea2 MZ |
681 | * Allocate packet. Max len of a BCSP pkt= |
682 | * 0xFFF (payload) +4 (header) +2 (crc) | |
683 | */ | |
1da177e4 LT |
684 | |
685 | bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC); | |
686 | if (!bcsp->rx_skb) { | |
687 | BT_ERR("Can't allocate mem for new packet"); | |
688 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
689 | bcsp->rx_count = 0; | |
690 | return 0; | |
691 | } | |
1da177e4 LT |
692 | break; |
693 | } | |
694 | break; | |
695 | } | |
696 | } | |
697 | return count; | |
698 | } | |
699 | ||
700 | /* Arrange to retransmit all messages in the relq. */ | |
04356052 | 701 | static void bcsp_timed_event(struct timer_list *t) |
1da177e4 | 702 | { |
04356052 KC |
703 | struct bcsp_struct *bcsp = from_timer(bcsp, t, tbcsp); |
704 | struct hci_uart *hu = bcsp->hu; | |
1da177e4 LT |
705 | struct sk_buff *skb; |
706 | unsigned long flags; | |
707 | ||
708 | BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen); | |
709 | ||
f89d75f2 | 710 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
711 | |
712 | while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) { | |
713 | bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07; | |
714 | skb_queue_head(&bcsp->rel, skb); | |
715 | } | |
716 | ||
717 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
718 | ||
719 | hci_uart_tx_wakeup(hu); | |
720 | } | |
721 | ||
722 | static int bcsp_open(struct hci_uart *hu) | |
723 | { | |
724 | struct bcsp_struct *bcsp; | |
725 | ||
726 | BT_DBG("hu %p", hu); | |
727 | ||
c063af34 | 728 | bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL); |
1da177e4 LT |
729 | if (!bcsp) |
730 | return -ENOMEM; | |
1da177e4 LT |
731 | |
732 | hu->priv = bcsp; | |
04356052 | 733 | bcsp->hu = hu; |
1da177e4 LT |
734 | skb_queue_head_init(&bcsp->unack); |
735 | skb_queue_head_init(&bcsp->rel); | |
736 | skb_queue_head_init(&bcsp->unrel); | |
737 | ||
04356052 | 738 | timer_setup(&bcsp->tbcsp, bcsp_timed_event, 0); |
1da177e4 LT |
739 | |
740 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
741 | ||
20dd6f59 MH |
742 | if (txcrc) |
743 | bcsp->use_crc = 1; | |
744 | ||
1da177e4 LT |
745 | return 0; |
746 | } | |
747 | ||
748 | static int bcsp_close(struct hci_uart *hu) | |
749 | { | |
750 | struct bcsp_struct *bcsp = hu->priv; | |
c327cddd MK |
751 | |
752 | del_timer_sync(&bcsp->tbcsp); | |
753 | ||
1da177e4 LT |
754 | hu->priv = NULL; |
755 | ||
756 | BT_DBG("hu %p", hu); | |
757 | ||
758 | skb_queue_purge(&bcsp->unack); | |
759 | skb_queue_purge(&bcsp->rel); | |
760 | skb_queue_purge(&bcsp->unrel); | |
1da177e4 LT |
761 | |
762 | kfree(bcsp); | |
763 | return 0; | |
764 | } | |
765 | ||
4ee7ef19 | 766 | static const struct hci_uart_proto bcsp = { |
0372a662 | 767 | .id = HCI_UART_BCSP, |
7c40fb8d | 768 | .name = "BCSP", |
0372a662 MH |
769 | .open = bcsp_open, |
770 | .close = bcsp_close, | |
771 | .enqueue = bcsp_enqueue, | |
772 | .dequeue = bcsp_dequeue, | |
773 | .recv = bcsp_recv, | |
774 | .flush = bcsp_flush | |
1da177e4 LT |
775 | }; |
776 | ||
f2b94bb9 | 777 | int __init bcsp_init(void) |
1da177e4 | 778 | { |
01009eec | 779 | return hci_uart_register_proto(&bcsp); |
1da177e4 LT |
780 | } |
781 | ||
f2b94bb9 | 782 | int __exit bcsp_deinit(void) |
1da177e4 LT |
783 | { |
784 | return hci_uart_unregister_proto(&bcsp); | |
785 | } | |
786 | ||
20dd6f59 MH |
787 | module_param(txcrc, bool, 0644); |
788 | MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet"); | |
789 | ||
1da177e4 LT |
790 | module_param(hciextn, bool, 0644); |
791 | MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets"); |