Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
0372a662 MH |
3 | * |
4 | * Bluetooth HCI UART driver | |
5 | * | |
6 | * Copyright (C) 2002-2003 Fabrizio Gennari <fabrizio.gennari@philips.com> | |
7 | * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> | |
1da177e4 LT |
8 | */ |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/fcntl.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/poll.h> | |
19 | ||
20 | #include <linux/slab.h> | |
21 | #include <linux/tty.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/signal.h> | |
25 | #include <linux/ioctl.h> | |
26 | #include <linux/skbuff.h> | |
c5ec5140 HH |
27 | #include <linux/bitrev.h> |
28 | #include <asm/unaligned.h> | |
1da177e4 LT |
29 | |
30 | #include <net/bluetooth/bluetooth.h> | |
31 | #include <net/bluetooth/hci_core.h> | |
0372a662 | 32 | |
1da177e4 | 33 | #include "hci_uart.h" |
1da177e4 | 34 | |
bff6b89f SV |
35 | static bool txcrc = true; |
36 | static bool hciextn = true; | |
1da177e4 | 37 | |
0372a662 MH |
38 | #define BCSP_TXWINSIZE 4 |
39 | ||
40 | #define BCSP_ACK_PKT 0x05 | |
41 | #define BCSP_LE_PKT 0x06 | |
42 | ||
43 | struct bcsp_struct { | |
44 | struct sk_buff_head unack; /* Unack'ed packets queue */ | |
45 | struct sk_buff_head rel; /* Reliable packets queue */ | |
46 | struct sk_buff_head unrel; /* Unreliable packets queue */ | |
47 | ||
48 | unsigned long rx_count; | |
49 | struct sk_buff *rx_skb; | |
50 | u8 rxseq_txack; /* rxseq == txack. */ | |
51 | u8 rxack; /* Last packet sent by us that the peer ack'ed */ | |
52 | struct timer_list tbcsp; | |
04356052 | 53 | struct hci_uart *hu; |
0372a662 MH |
54 | |
55 | enum { | |
56 | BCSP_W4_PKT_DELIMITER, | |
57 | BCSP_W4_PKT_START, | |
58 | BCSP_W4_BCSP_HDR, | |
59 | BCSP_W4_DATA, | |
60 | BCSP_W4_CRC | |
61 | } rx_state; | |
62 | ||
63 | enum { | |
64 | BCSP_ESCSTATE_NOESC, | |
65 | BCSP_ESCSTATE_ESC | |
66 | } rx_esc_state; | |
67 | ||
68 | u8 use_crc; | |
69 | u16 message_crc; | |
70 | u8 txack_req; /* Do we need to send ack's to the peer? */ | |
71 | ||
72 | /* Reliable packet sequence number - used to assign seq to each rel pkt. */ | |
73 | u8 msgq_txseq; | |
74 | }; | |
75 | ||
1da177e4 LT |
76 | /* ---- BCSP CRC calculation ---- */ |
77 | ||
78 | /* Table for calculating CRC for polynomial 0x1021, LSB processed first, | |
8083ad1c DJ |
79 | * initial value 0xffff, bits shifted in reverse order. |
80 | */ | |
1da177e4 LT |
81 | |
82 | static const u16 crc_table[] = { | |
83 | 0x0000, 0x1081, 0x2102, 0x3183, | |
84 | 0x4204, 0x5285, 0x6306, 0x7387, | |
85 | 0x8408, 0x9489, 0xa50a, 0xb58b, | |
86 | 0xc60c, 0xd68d, 0xe70e, 0xf78f | |
87 | }; | |
88 | ||
89 | /* Initialise the crc calculator */ | |
90 | #define BCSP_CRC_INIT(x) x = 0xffff | |
91 | ||
8805eea2 MZ |
92 | /* Update crc with next data byte |
93 | * | |
94 | * Implementation note | |
95 | * The data byte is treated as two nibbles. The crc is generated | |
96 | * in reverse, i.e., bits are fed into the register from the top. | |
97 | */ | |
1da177e4 LT |
98 | static void bcsp_crc_update(u16 *crc, u8 d) |
99 | { | |
100 | u16 reg = *crc; | |
101 | ||
102 | reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f]; | |
103 | reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f]; | |
104 | ||
105 | *crc = reg; | |
106 | } | |
107 | ||
1da177e4 LT |
108 | /* ---- BCSP core ---- */ |
109 | ||
110 | static void bcsp_slip_msgdelim(struct sk_buff *skb) | |
111 | { | |
112 | const char pkt_delim = 0xc0; | |
0372a662 | 113 | |
59ae1d12 | 114 | skb_put_data(skb, &pkt_delim, 1); |
1da177e4 LT |
115 | } |
116 | ||
117 | static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c) | |
118 | { | |
119 | const char esc_c0[2] = { 0xdb, 0xdc }; | |
120 | const char esc_db[2] = { 0xdb, 0xdd }; | |
121 | ||
122 | switch (c) { | |
123 | case 0xc0: | |
59ae1d12 | 124 | skb_put_data(skb, &esc_c0, 2); |
1da177e4 LT |
125 | break; |
126 | case 0xdb: | |
59ae1d12 | 127 | skb_put_data(skb, &esc_db, 2); |
1da177e4 LT |
128 | break; |
129 | default: | |
59ae1d12 | 130 | skb_put_data(skb, &c, 1); |
1da177e4 LT |
131 | } |
132 | } | |
133 | ||
134 | static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
135 | { | |
136 | struct bcsp_struct *bcsp = hu->priv; | |
137 | ||
138 | if (skb->len > 0xFFF) { | |
139 | BT_ERR("Packet too long"); | |
140 | kfree_skb(skb); | |
141 | return 0; | |
142 | } | |
143 | ||
618e8bc2 | 144 | switch (hci_skb_pkt_type(skb)) { |
1da177e4 LT |
145 | case HCI_ACLDATA_PKT: |
146 | case HCI_COMMAND_PKT: | |
147 | skb_queue_tail(&bcsp->rel, skb); | |
148 | break; | |
149 | ||
150 | case HCI_SCODATA_PKT: | |
151 | skb_queue_tail(&bcsp->unrel, skb); | |
152 | break; | |
153 | ||
154 | default: | |
155 | BT_ERR("Unknown packet type"); | |
156 | kfree_skb(skb); | |
157 | break; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, | |
8083ad1c | 164 | int len, int pkt_type) |
1da177e4 LT |
165 | { |
166 | struct sk_buff *nskb; | |
167 | u8 hdr[4], chan; | |
1da177e4 | 168 | u16 BCSP_CRC_INIT(bcsp_txmsg_crc); |
20dd6f59 | 169 | int rel, i; |
1da177e4 LT |
170 | |
171 | switch (pkt_type) { | |
172 | case HCI_ACLDATA_PKT: | |
173 | chan = 6; /* BCSP ACL channel */ | |
174 | rel = 1; /* reliable channel */ | |
175 | break; | |
176 | case HCI_COMMAND_PKT: | |
177 | chan = 5; /* BCSP cmd/evt channel */ | |
178 | rel = 1; /* reliable channel */ | |
179 | break; | |
180 | case HCI_SCODATA_PKT: | |
181 | chan = 7; /* BCSP SCO channel */ | |
182 | rel = 0; /* unreliable channel */ | |
183 | break; | |
184 | case BCSP_LE_PKT: | |
185 | chan = 1; /* BCSP LE channel */ | |
186 | rel = 0; /* unreliable channel */ | |
187 | break; | |
188 | case BCSP_ACK_PKT: | |
189 | chan = 0; /* BCSP internal channel */ | |
190 | rel = 0; /* unreliable channel */ | |
191 | break; | |
192 | default: | |
193 | BT_ERR("Unknown packet type"); | |
194 | return NULL; | |
195 | } | |
196 | ||
197 | if (hciextn && chan == 5) { | |
c5ec5140 | 198 | __le16 opcode = ((struct hci_command_hdr *)data)->opcode; |
1da177e4 | 199 | |
a9de9248 | 200 | /* Vendor specific commands */ |
c5ec5140 | 201 | if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) { |
1da177e4 | 202 | u8 desc = *(data + HCI_COMMAND_HDR_SIZE); |
8083ad1c | 203 | |
1da177e4 LT |
204 | if ((desc & 0xf0) == 0xc0) { |
205 | data += HCI_COMMAND_HDR_SIZE + 1; | |
206 | len -= HCI_COMMAND_HDR_SIZE + 1; | |
207 | chan = desc & 0x0f; | |
208 | } | |
209 | } | |
210 | } | |
211 | ||
212 | /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2 | |
8805eea2 MZ |
213 | * (because bytes 0xc0 and 0xdb are escaped, worst case is |
214 | * when the packet is all made of 0xc0 and 0xdb :) ) | |
215 | * + 2 (0xc0 delimiters at start and end). | |
216 | */ | |
1da177e4 LT |
217 | |
218 | nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC); | |
219 | if (!nskb) | |
220 | return NULL; | |
221 | ||
618e8bc2 | 222 | hci_skb_pkt_type(nskb) = pkt_type; |
1da177e4 LT |
223 | |
224 | bcsp_slip_msgdelim(nskb); | |
225 | ||
226 | hdr[0] = bcsp->rxseq_txack << 3; | |
227 | bcsp->txack_req = 0; | |
228 | BT_DBG("We request packet no %u to card", bcsp->rxseq_txack); | |
229 | ||
230 | if (rel) { | |
231 | hdr[0] |= 0x80 + bcsp->msgq_txseq; | |
232 | BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq); | |
dd1589a4 | 233 | bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07; |
1da177e4 | 234 | } |
20dd6f59 MH |
235 | |
236 | if (bcsp->use_crc) | |
237 | hdr[0] |= 0x40; | |
1da177e4 LT |
238 | |
239 | hdr[1] = ((len << 4) & 0xff) | chan; | |
240 | hdr[2] = len >> 4; | |
241 | hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]); | |
242 | ||
243 | /* Put BCSP header */ | |
244 | for (i = 0; i < 4; i++) { | |
245 | bcsp_slip_one_byte(nskb, hdr[i]); | |
20dd6f59 MH |
246 | |
247 | if (bcsp->use_crc) | |
248 | bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); | |
1da177e4 LT |
249 | } |
250 | ||
251 | /* Put payload */ | |
252 | for (i = 0; i < len; i++) { | |
253 | bcsp_slip_one_byte(nskb, data[i]); | |
20dd6f59 MH |
254 | |
255 | if (bcsp->use_crc) | |
256 | bcsp_crc_update(&bcsp_txmsg_crc, data[i]); | |
1da177e4 LT |
257 | } |
258 | ||
1da177e4 | 259 | /* Put CRC */ |
20dd6f59 | 260 | if (bcsp->use_crc) { |
c5ec5140 | 261 | bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc); |
8083ad1c DJ |
262 | bcsp_slip_one_byte(nskb, (u8)((bcsp_txmsg_crc >> 8) & 0x00ff)); |
263 | bcsp_slip_one_byte(nskb, (u8)(bcsp_txmsg_crc & 0x00ff)); | |
20dd6f59 | 264 | } |
1da177e4 LT |
265 | |
266 | bcsp_slip_msgdelim(nskb); | |
267 | return nskb; | |
268 | } | |
269 | ||
270 | /* This is a rewrite of pkt_avail in ABCSP */ | |
271 | static struct sk_buff *bcsp_dequeue(struct hci_uart *hu) | |
272 | { | |
273 | struct bcsp_struct *bcsp = hu->priv; | |
274 | unsigned long flags; | |
275 | struct sk_buff *skb; | |
8805eea2 | 276 | |
1da177e4 | 277 | /* First of all, check for unreliable messages in the queue, |
8083ad1c DJ |
278 | * since they have priority |
279 | */ | |
1da177e4 | 280 | |
a08b15e6 VI |
281 | skb = skb_dequeue(&bcsp->unrel); |
282 | if (skb != NULL) { | |
618e8bc2 MH |
283 | struct sk_buff *nskb; |
284 | ||
285 | nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, | |
286 | hci_skb_pkt_type(skb)); | |
1da177e4 LT |
287 | if (nskb) { |
288 | kfree_skb(skb); | |
289 | return nskb; | |
290 | } else { | |
291 | skb_queue_head(&bcsp->unrel, skb); | |
292 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
293 | } | |
294 | } | |
295 | ||
296 | /* Now, try to send a reliable pkt. We can only send a | |
8805eea2 MZ |
297 | * reliable packet if the number of packets sent but not yet ack'ed |
298 | * is < than the winsize | |
299 | */ | |
1da177e4 | 300 | |
f89d75f2 | 301 | spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); |
1da177e4 | 302 | |
a08b15e6 VI |
303 | if (bcsp->unack.qlen < BCSP_TXWINSIZE) { |
304 | skb = skb_dequeue(&bcsp->rel); | |
305 | if (skb != NULL) { | |
618e8bc2 MH |
306 | struct sk_buff *nskb; |
307 | ||
308 | nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, | |
309 | hci_skb_pkt_type(skb)); | |
a08b15e6 VI |
310 | if (nskb) { |
311 | __skb_queue_tail(&bcsp->unack, skb); | |
312 | mod_timer(&bcsp->tbcsp, jiffies + HZ / 4); | |
313 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
314 | return nskb; | |
315 | } else { | |
316 | skb_queue_head(&bcsp->rel, skb); | |
317 | BT_ERR("Could not dequeue pkt because alloc_skb failed"); | |
318 | } | |
1da177e4 LT |
319 | } |
320 | } | |
321 | ||
322 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); | |
323 | ||
1da177e4 | 324 | /* We could not send a reliable packet, either because there are |
8805eea2 MZ |
325 | * none or because there are too many unack'ed pkts. Did we receive |
326 | * any packets we have not acknowledged yet ? | |
327 | */ | |
1da177e4 LT |
328 | |
329 | if (bcsp->txack_req) { | |
330 | /* if so, craft an empty ACK pkt and send it on BCSP unreliable | |
8805eea2 MZ |
331 | * channel 0 |
332 | */ | |
1da177e4 LT |
333 | struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT); |
334 | return nskb; | |
335 | } | |
336 | ||
337 | /* We have nothing to send */ | |
338 | return NULL; | |
339 | } | |
340 | ||
341 | static int bcsp_flush(struct hci_uart *hu) | |
342 | { | |
343 | BT_DBG("hu %p", hu); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | /* Remove ack'ed packets */ | |
348 | static void bcsp_pkt_cull(struct bcsp_struct *bcsp) | |
349 | { | |
8fc5387c | 350 | struct sk_buff *skb, *tmp; |
1da177e4 | 351 | unsigned long flags; |
1da177e4 LT |
352 | int i, pkts_to_be_removed; |
353 | u8 seqno; | |
354 | ||
355 | spin_lock_irqsave(&bcsp->unack.lock, flags); | |
356 | ||
8fc5387c | 357 | pkts_to_be_removed = skb_queue_len(&bcsp->unack); |
1da177e4 LT |
358 | seqno = bcsp->msgq_txseq; |
359 | ||
360 | while (pkts_to_be_removed) { | |
361 | if (bcsp->rxack == seqno) | |
362 | break; | |
363 | pkts_to_be_removed--; | |
364 | seqno = (seqno - 1) & 0x07; | |
365 | } | |
366 | ||
367 | if (bcsp->rxack != seqno) | |
368 | BT_ERR("Peer acked invalid packet"); | |
369 | ||
370 | BT_DBG("Removing %u pkts out of %u, up to seqno %u", | |
8fc5387c DM |
371 | pkts_to_be_removed, skb_queue_len(&bcsp->unack), |
372 | (seqno - 1) & 0x07); | |
1da177e4 | 373 | |
8fc5387c DM |
374 | i = 0; |
375 | skb_queue_walk_safe(&bcsp->unack, skb, tmp) { | |
d2e353f7 | 376 | if (i >= pkts_to_be_removed) |
8fc5387c | 377 | break; |
d2e353f7 | 378 | i++; |
1da177e4 | 379 | |
1da177e4 LT |
380 | __skb_unlink(skb, &bcsp->unack); |
381 | kfree_skb(skb); | |
1da177e4 | 382 | } |
0372a662 | 383 | |
8fc5387c | 384 | if (skb_queue_empty(&bcsp->unack)) |
1da177e4 | 385 | del_timer(&bcsp->tbcsp); |
0372a662 | 386 | |
1da177e4 LT |
387 | spin_unlock_irqrestore(&bcsp->unack.lock, flags); |
388 | ||
389 | if (i != pkts_to_be_removed) | |
390 | BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed); | |
391 | } | |
392 | ||
393 | /* Handle BCSP link-establishment packets. When we | |
8805eea2 MZ |
394 | * detect a "sync" packet, symptom that the BT module has reset, |
395 | * we do nothing :) (yet) | |
396 | */ | |
1da177e4 LT |
397 | static void bcsp_handle_le_pkt(struct hci_uart *hu) |
398 | { | |
399 | struct bcsp_struct *bcsp = hu->priv; | |
400 | u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed }; | |
401 | u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 }; | |
402 | u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed }; | |
403 | ||
404 | /* spot "conf" pkts and reply with a "conf rsp" pkt */ | |
405 | if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
8083ad1c | 406 | !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) { |
1da177e4 LT |
407 | struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC); |
408 | ||
409 | BT_DBG("Found a LE conf pkt"); | |
410 | if (!nskb) | |
411 | return; | |
59ae1d12 | 412 | skb_put_data(nskb, conf_rsp_pkt, 4); |
618e8bc2 | 413 | hci_skb_pkt_type(nskb) = BCSP_LE_PKT; |
1da177e4 LT |
414 | |
415 | skb_queue_head(&bcsp->unrel, nskb); | |
416 | hci_uart_tx_wakeup(hu); | |
417 | } | |
418 | /* Spot "sync" pkts. If we find one...disaster! */ | |
419 | else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && | |
8083ad1c | 420 | !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) { |
1da177e4 LT |
421 | BT_ERR("Found a LE sync pkt, card has reset"); |
422 | } | |
423 | } | |
424 | ||
425 | static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte) | |
426 | { | |
427 | const u8 c0 = 0xc0, db = 0xdb; | |
428 | ||
429 | switch (bcsp->rx_esc_state) { | |
430 | case BCSP_ESCSTATE_NOESC: | |
431 | switch (byte) { | |
432 | case 0xdb: | |
433 | bcsp->rx_esc_state = BCSP_ESCSTATE_ESC; | |
434 | break; | |
435 | default: | |
59ae1d12 | 436 | skb_put_data(bcsp->rx_skb, &byte, 1); |
fe8de008 | 437 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 438 | bcsp->rx_state != BCSP_W4_CRC) |
1da177e4 LT |
439 | bcsp_crc_update(&bcsp->message_crc, byte); |
440 | bcsp->rx_count--; | |
441 | } | |
442 | break; | |
443 | ||
444 | case BCSP_ESCSTATE_ESC: | |
445 | switch (byte) { | |
446 | case 0xdc: | |
59ae1d12 | 447 | skb_put_data(bcsp->rx_skb, &c0, 1); |
fe8de008 | 448 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 449 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 450 | bcsp_crc_update(&bcsp->message_crc, 0xc0); |
1da177e4 LT |
451 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
452 | bcsp->rx_count--; | |
453 | break; | |
454 | ||
455 | case 0xdd: | |
59ae1d12 | 456 | skb_put_data(bcsp->rx_skb, &db, 1); |
fe8de008 | 457 | if ((bcsp->rx_skb->data[0] & 0x40) != 0 && |
8083ad1c | 458 | bcsp->rx_state != BCSP_W4_CRC) |
fe8de008 | 459 | bcsp_crc_update(&bcsp->message_crc, 0xdb); |
1da177e4 LT |
460 | bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; |
461 | bcsp->rx_count--; | |
462 | break; | |
463 | ||
464 | default: | |
fe8de008 | 465 | BT_ERR("Invalid byte %02x after esc byte", byte); |
1da177e4 LT |
466 | kfree_skb(bcsp->rx_skb); |
467 | bcsp->rx_skb = NULL; | |
468 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
469 | bcsp->rx_count = 0; | |
470 | } | |
471 | } | |
472 | } | |
473 | ||
858119e1 | 474 | static void bcsp_complete_rx_pkt(struct hci_uart *hu) |
1da177e4 LT |
475 | { |
476 | struct bcsp_struct *bcsp = hu->priv; | |
37332ddc | 477 | int pass_up = 0; |
1da177e4 LT |
478 | |
479 | if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */ | |
480 | BT_DBG("Received seqno %u from card", bcsp->rxseq_txack); | |
37332ddc DJ |
481 | |
482 | /* check the rx sequence number is as expected */ | |
483 | if ((bcsp->rx_skb->data[0] & 0x07) == bcsp->rxseq_txack) { | |
484 | bcsp->rxseq_txack++; | |
485 | bcsp->rxseq_txack %= 0x8; | |
486 | } else { | |
487 | /* handle re-transmitted packet or | |
488 | * when packet was missed | |
489 | */ | |
490 | BT_ERR("Out-of-order packet arrived, got %u expected %u", | |
491 | bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack); | |
492 | ||
493 | /* do not process out-of-order packet payload */ | |
494 | pass_up = 2; | |
495 | } | |
496 | ||
497 | /* send current txack value to all received reliable packets */ | |
498 | bcsp->txack_req = 1; | |
1da177e4 LT |
499 | |
500 | /* If needed, transmit an ack pkt */ | |
501 | hci_uart_tx_wakeup(hu); | |
502 | } | |
503 | ||
504 | bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07; | |
505 | BT_DBG("Request for pkt %u from card", bcsp->rxack); | |
506 | ||
37332ddc DJ |
507 | /* handle received ACK indications, |
508 | * including those from out-of-order packets | |
509 | */ | |
1da177e4 | 510 | bcsp_pkt_cull(bcsp); |
37332ddc DJ |
511 | |
512 | if (pass_up != 2) { | |
513 | if ((bcsp->rx_skb->data[1] & 0x0f) == 6 && | |
514 | (bcsp->rx_skb->data[0] & 0x80)) { | |
515 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_ACLDATA_PKT; | |
516 | pass_up = 1; | |
517 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && | |
518 | (bcsp->rx_skb->data[0] & 0x80)) { | |
519 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; | |
520 | pass_up = 1; | |
521 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { | |
522 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_SCODATA_PKT; | |
523 | pass_up = 1; | |
524 | } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 && | |
525 | !(bcsp->rx_skb->data[0] & 0x80)) { | |
526 | bcsp_handle_le_pkt(hu); | |
527 | pass_up = 0; | |
528 | } else { | |
529 | pass_up = 0; | |
530 | } | |
531 | } | |
532 | ||
533 | if (pass_up == 0) { | |
1da177e4 LT |
534 | struct hci_event_hdr hdr; |
535 | u8 desc = (bcsp->rx_skb->data[1] & 0x0f); | |
536 | ||
537 | if (desc != 0 && desc != 1) { | |
538 | if (hciextn) { | |
539 | desc |= 0xc0; | |
540 | skb_pull(bcsp->rx_skb, 4); | |
541 | memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1); | |
542 | ||
543 | hdr.evt = 0xff; | |
544 | hdr.plen = bcsp->rx_skb->len; | |
545 | memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE); | |
618e8bc2 | 546 | hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; |
1da177e4 | 547 | |
e1a26170 | 548 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
1da177e4 | 549 | } else { |
fe8de008 | 550 | BT_ERR("Packet for unknown channel (%u %s)", |
8083ad1c DJ |
551 | bcsp->rx_skb->data[1] & 0x0f, |
552 | bcsp->rx_skb->data[0] & 0x80 ? | |
553 | "reliable" : "unreliable"); | |
1da177e4 LT |
554 | kfree_skb(bcsp->rx_skb); |
555 | } | |
556 | } else | |
557 | kfree_skb(bcsp->rx_skb); | |
37332ddc | 558 | } else if (pass_up == 1) { |
1da177e4 LT |
559 | /* Pull out BCSP hdr */ |
560 | skb_pull(bcsp->rx_skb, 4); | |
561 | ||
e1a26170 | 562 | hci_recv_frame(hu->hdev, bcsp->rx_skb); |
37332ddc DJ |
563 | } else { |
564 | /* ignore packet payload of already ACKed re-transmitted | |
565 | * packets or when a packet was missed in the BCSP window | |
566 | */ | |
567 | kfree_skb(bcsp->rx_skb); | |
1da177e4 | 568 | } |
0372a662 | 569 | |
1da177e4 LT |
570 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
571 | bcsp->rx_skb = NULL; | |
572 | } | |
573 | ||
c5ec5140 HH |
574 | static u16 bscp_get_crc(struct bcsp_struct *bcsp) |
575 | { | |
576 | return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]); | |
577 | } | |
578 | ||
1da177e4 | 579 | /* Recv data */ |
9d1c40eb | 580 | static int bcsp_recv(struct hci_uart *hu, const void *data, int count) |
1da177e4 LT |
581 | { |
582 | struct bcsp_struct *bcsp = hu->priv; | |
9d1c40eb | 583 | const unsigned char *ptr; |
1da177e4 | 584 | |
8805eea2 | 585 | BT_DBG("hu %p count %d rx_state %d rx_count %ld", |
8083ad1c | 586 | hu, count, bcsp->rx_state, bcsp->rx_count); |
1da177e4 LT |
587 | |
588 | ptr = data; | |
589 | while (count) { | |
590 | if (bcsp->rx_count) { | |
591 | if (*ptr == 0xc0) { | |
592 | BT_ERR("Short BCSP packet"); | |
593 | kfree_skb(bcsp->rx_skb); | |
cf94da6f | 594 | bcsp->rx_skb = NULL; |
1da177e4 LT |
595 | bcsp->rx_state = BCSP_W4_PKT_START; |
596 | bcsp->rx_count = 0; | |
597 | } else | |
598 | bcsp_unslip_one_byte(bcsp, *ptr); | |
599 | ||
600 | ptr++; count--; | |
601 | continue; | |
602 | } | |
603 | ||
604 | switch (bcsp->rx_state) { | |
605 | case BCSP_W4_BCSP_HDR: | |
8083ad1c DJ |
606 | if ((0xff & (u8)~(bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] + |
607 | bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { | |
1da177e4 LT |
608 | BT_ERR("Error in BCSP hdr checksum"); |
609 | kfree_skb(bcsp->rx_skb); | |
cf94da6f | 610 | bcsp->rx_skb = NULL; |
1da177e4 LT |
611 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; |
612 | bcsp->rx_count = 0; | |
613 | continue; | |
614 | } | |
1da177e4 | 615 | bcsp->rx_state = BCSP_W4_DATA; |
8805eea2 | 616 | bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) + |
1da177e4 LT |
617 | (bcsp->rx_skb->data[2] << 4); /* May be 0 */ |
618 | continue; | |
619 | ||
620 | case BCSP_W4_DATA: | |
621 | if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */ | |
622 | bcsp->rx_state = BCSP_W4_CRC; | |
623 | bcsp->rx_count = 2; | |
624 | } else | |
625 | bcsp_complete_rx_pkt(hu); | |
626 | continue; | |
627 | ||
628 | case BCSP_W4_CRC: | |
c5ec5140 | 629 | if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) { |
8805eea2 | 630 | BT_ERR("Checksum failed: computed %04x received %04x", |
8083ad1c DJ |
631 | bitrev16(bcsp->message_crc), |
632 | bscp_get_crc(bcsp)); | |
1da177e4 LT |
633 | |
634 | kfree_skb(bcsp->rx_skb); | |
cf94da6f | 635 | bcsp->rx_skb = NULL; |
1da177e4 LT |
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 | 668 | /* Do not increment ptr or decrement count |
8805eea2 MZ |
669 | * Allocate packet. Max len of a BCSP pkt= |
670 | * 0xFFF (payload) +4 (header) +2 (crc) | |
671 | */ | |
1da177e4 LT |
672 | |
673 | bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC); | |
674 | if (!bcsp->rx_skb) { | |
675 | BT_ERR("Can't allocate mem for new packet"); | |
676 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
677 | bcsp->rx_count = 0; | |
678 | return 0; | |
679 | } | |
1da177e4 LT |
680 | break; |
681 | } | |
682 | break; | |
683 | } | |
684 | } | |
685 | return count; | |
686 | } | |
687 | ||
688 | /* Arrange to retransmit all messages in the relq. */ | |
04356052 | 689 | static void bcsp_timed_event(struct timer_list *t) |
1da177e4 | 690 | { |
04356052 KC |
691 | struct bcsp_struct *bcsp = from_timer(bcsp, t, tbcsp); |
692 | struct hci_uart *hu = bcsp->hu; | |
1da177e4 LT |
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 | ||
c063af34 | 716 | bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL); |
1da177e4 LT |
717 | if (!bcsp) |
718 | return -ENOMEM; | |
1da177e4 LT |
719 | |
720 | hu->priv = bcsp; | |
04356052 | 721 | bcsp->hu = hu; |
1da177e4 LT |
722 | skb_queue_head_init(&bcsp->unack); |
723 | skb_queue_head_init(&bcsp->rel); | |
724 | skb_queue_head_init(&bcsp->unrel); | |
725 | ||
04356052 | 726 | timer_setup(&bcsp->tbcsp, bcsp_timed_event, 0); |
1da177e4 LT |
727 | |
728 | bcsp->rx_state = BCSP_W4_PKT_DELIMITER; | |
729 | ||
20dd6f59 MH |
730 | if (txcrc) |
731 | bcsp->use_crc = 1; | |
732 | ||
1da177e4 LT |
733 | return 0; |
734 | } | |
735 | ||
736 | static int bcsp_close(struct hci_uart *hu) | |
737 | { | |
738 | struct bcsp_struct *bcsp = hu->priv; | |
c327cddd MK |
739 | |
740 | del_timer_sync(&bcsp->tbcsp); | |
741 | ||
1da177e4 LT |
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); | |
1da177e4 | 749 | |
4ce9146e TB |
750 | if (bcsp->rx_skb) { |
751 | kfree_skb(bcsp->rx_skb); | |
752 | bcsp->rx_skb = NULL; | |
753 | } | |
754 | ||
1da177e4 LT |
755 | kfree(bcsp); |
756 | return 0; | |
757 | } | |
758 | ||
4ee7ef19 | 759 | static const struct hci_uart_proto bcsp = { |
0372a662 | 760 | .id = HCI_UART_BCSP, |
7c40fb8d | 761 | .name = "BCSP", |
0372a662 MH |
762 | .open = bcsp_open, |
763 | .close = bcsp_close, | |
764 | .enqueue = bcsp_enqueue, | |
765 | .dequeue = bcsp_dequeue, | |
766 | .recv = bcsp_recv, | |
767 | .flush = bcsp_flush | |
1da177e4 LT |
768 | }; |
769 | ||
f2b94bb9 | 770 | int __init bcsp_init(void) |
1da177e4 | 771 | { |
01009eec | 772 | return hci_uart_register_proto(&bcsp); |
1da177e4 LT |
773 | } |
774 | ||
f2b94bb9 | 775 | int __exit bcsp_deinit(void) |
1da177e4 LT |
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"); |