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Commit | Line | Data |
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166d2f6a OBC |
1 | /* |
2 | * Texas Instruments' Bluetooth HCILL UART protocol | |
3 | * | |
4 | * HCILL (HCI Low Level) is a Texas Instruments' power management | |
5 | * protocol extension to H4. | |
6 | * | |
7 | * Copyright (C) 2007 Texas Instruments, Inc. | |
8 | * | |
9 | * Written by Ohad Ben-Cohen <ohad@bencohen.org> | |
10 | * | |
11 | * Acknowledgements: | |
12 | * This file is based on hci_h4.c, which was written | |
13 | * by Maxim Krasnyansky and Marcel Holtmann. | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License version 2 | |
17 | * as published by the Free Software Foundation | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
27 | * | |
28 | */ | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/kernel.h> | |
32 | ||
33 | #include <linux/init.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/fcntl.h> | |
37180552 | 37 | #include <linux/firmware.h> |
166d2f6a OBC |
38 | #include <linux/interrupt.h> |
39 | #include <linux/ptrace.h> | |
40 | #include <linux/poll.h> | |
41 | ||
42 | #include <linux/slab.h> | |
166d2f6a OBC |
43 | #include <linux/errno.h> |
44 | #include <linux/string.h> | |
45 | #include <linux/signal.h> | |
46 | #include <linux/ioctl.h> | |
37180552 RH |
47 | #include <linux/of.h> |
48 | #include <linux/serdev.h> | |
166d2f6a | 49 | #include <linux/skbuff.h> |
37180552 | 50 | #include <linux/ti_wilink_st.h> |
43d3d092 | 51 | #include <linux/clk.h> |
166d2f6a OBC |
52 | |
53 | #include <net/bluetooth/bluetooth.h> | |
54 | #include <net/bluetooth/hci_core.h> | |
37180552 | 55 | #include <linux/gpio/consumer.h> |
166d2f6a OBC |
56 | |
57 | #include "hci_uart.h" | |
58 | ||
59 | /* HCILL commands */ | |
60 | #define HCILL_GO_TO_SLEEP_IND 0x30 | |
61 | #define HCILL_GO_TO_SLEEP_ACK 0x31 | |
62 | #define HCILL_WAKE_UP_IND 0x32 | |
63 | #define HCILL_WAKE_UP_ACK 0x33 | |
64 | ||
65 | /* HCILL receiver States */ | |
66 | #define HCILL_W4_PACKET_TYPE 0 | |
67 | #define HCILL_W4_EVENT_HDR 1 | |
68 | #define HCILL_W4_ACL_HDR 2 | |
69 | #define HCILL_W4_SCO_HDR 3 | |
70 | #define HCILL_W4_DATA 4 | |
71 | ||
72 | /* HCILL states */ | |
73 | enum hcill_states_e { | |
74 | HCILL_ASLEEP, | |
75 | HCILL_ASLEEP_TO_AWAKE, | |
76 | HCILL_AWAKE, | |
77 | HCILL_AWAKE_TO_ASLEEP | |
78 | }; | |
79 | ||
80 | struct hcill_cmd { | |
81 | u8 cmd; | |
81ca405a | 82 | } __packed; |
166d2f6a | 83 | |
37180552 RH |
84 | struct ll_device { |
85 | struct hci_uart hu; | |
86 | struct serdev_device *serdev; | |
87 | struct gpio_desc *enable_gpio; | |
43d3d092 | 88 | struct clk *ext_clk; |
37180552 RH |
89 | }; |
90 | ||
166d2f6a OBC |
91 | struct ll_struct { |
92 | unsigned long rx_state; | |
93 | unsigned long rx_count; | |
94 | struct sk_buff *rx_skb; | |
95 | struct sk_buff_head txq; | |
96 | spinlock_t hcill_lock; /* HCILL state lock */ | |
97 | unsigned long hcill_state; /* HCILL power state */ | |
98 | struct sk_buff_head tx_wait_q; /* HCILL wait queue */ | |
99 | }; | |
100 | ||
101 | /* | |
102 | * Builds and sends an HCILL command packet. | |
103 | * These are very simple packets with only 1 cmd byte | |
104 | */ | |
105 | static int send_hcill_cmd(u8 cmd, struct hci_uart *hu) | |
106 | { | |
107 | int err = 0; | |
108 | struct sk_buff *skb = NULL; | |
109 | struct ll_struct *ll = hu->priv; | |
110 | struct hcill_cmd *hcill_packet; | |
111 | ||
112 | BT_DBG("hu %p cmd 0x%x", hu, cmd); | |
113 | ||
114 | /* allocate packet */ | |
115 | skb = bt_skb_alloc(1, GFP_ATOMIC); | |
116 | if (!skb) { | |
117 | BT_ERR("cannot allocate memory for HCILL packet"); | |
118 | err = -ENOMEM; | |
119 | goto out; | |
120 | } | |
121 | ||
122 | /* prepare packet */ | |
4df864c1 | 123 | hcill_packet = skb_put(skb, 1); |
166d2f6a | 124 | hcill_packet->cmd = cmd; |
166d2f6a OBC |
125 | |
126 | /* send packet */ | |
127 | skb_queue_tail(&ll->txq, skb); | |
128 | out: | |
129 | return err; | |
130 | } | |
131 | ||
132 | /* Initialize protocol */ | |
133 | static int ll_open(struct hci_uart *hu) | |
134 | { | |
135 | struct ll_struct *ll; | |
136 | ||
137 | BT_DBG("hu %p", hu); | |
138 | ||
9eb648c3 | 139 | ll = kzalloc(sizeof(*ll), GFP_KERNEL); |
166d2f6a OBC |
140 | if (!ll) |
141 | return -ENOMEM; | |
142 | ||
143 | skb_queue_head_init(&ll->txq); | |
144 | skb_queue_head_init(&ll->tx_wait_q); | |
145 | spin_lock_init(&ll->hcill_lock); | |
146 | ||
147 | ll->hcill_state = HCILL_AWAKE; | |
148 | ||
149 | hu->priv = ll; | |
150 | ||
43d3d092 UH |
151 | if (hu->serdev) { |
152 | struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev); | |
37180552 | 153 | serdev_device_open(hu->serdev); |
43d3d092 UH |
154 | if (!IS_ERR(lldev->ext_clk)) |
155 | clk_prepare_enable(lldev->ext_clk); | |
156 | } | |
37180552 | 157 | |
166d2f6a OBC |
158 | return 0; |
159 | } | |
160 | ||
161 | /* Flush protocol data */ | |
162 | static int ll_flush(struct hci_uart *hu) | |
163 | { | |
164 | struct ll_struct *ll = hu->priv; | |
165 | ||
166 | BT_DBG("hu %p", hu); | |
167 | ||
168 | skb_queue_purge(&ll->tx_wait_q); | |
169 | skb_queue_purge(&ll->txq); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | /* Close protocol */ | |
175 | static int ll_close(struct hci_uart *hu) | |
176 | { | |
177 | struct ll_struct *ll = hu->priv; | |
178 | ||
179 | BT_DBG("hu %p", hu); | |
180 | ||
181 | skb_queue_purge(&ll->tx_wait_q); | |
182 | skb_queue_purge(&ll->txq); | |
183 | ||
b1fb0683 | 184 | kfree_skb(ll->rx_skb); |
166d2f6a | 185 | |
37180552 RH |
186 | if (hu->serdev) { |
187 | struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev); | |
188 | gpiod_set_value_cansleep(lldev->enable_gpio, 0); | |
189 | ||
43d3d092 UH |
190 | clk_disable_unprepare(lldev->ext_clk); |
191 | ||
37180552 RH |
192 | serdev_device_close(hu->serdev); |
193 | } | |
194 | ||
166d2f6a OBC |
195 | hu->priv = NULL; |
196 | ||
197 | kfree(ll); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* | |
203 | * internal function, which does common work of the device wake up process: | |
204 | * 1. places all pending packets (waiting in tx_wait_q list) in txq list. | |
205 | * 2. changes internal state to HCILL_AWAKE. | |
206 | * Note: assumes that hcill_lock spinlock is taken, | |
207 | * shouldn't be called otherwise! | |
208 | */ | |
209 | static void __ll_do_awake(struct ll_struct *ll) | |
210 | { | |
211 | struct sk_buff *skb = NULL; | |
212 | ||
213 | while ((skb = skb_dequeue(&ll->tx_wait_q))) | |
214 | skb_queue_tail(&ll->txq, skb); | |
215 | ||
216 | ll->hcill_state = HCILL_AWAKE; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Called upon a wake-up-indication from the device | |
221 | */ | |
222 | static void ll_device_want_to_wakeup(struct hci_uart *hu) | |
223 | { | |
224 | unsigned long flags; | |
225 | struct ll_struct *ll = hu->priv; | |
226 | ||
227 | BT_DBG("hu %p", hu); | |
228 | ||
229 | /* lock hcill state */ | |
230 | spin_lock_irqsave(&ll->hcill_lock, flags); | |
231 | ||
232 | switch (ll->hcill_state) { | |
5c548226 OBC |
233 | case HCILL_ASLEEP_TO_AWAKE: |
234 | /* | |
235 | * This state means that both the host and the BRF chip | |
236 | * have simultaneously sent a wake-up-indication packet. | |
25985edc | 237 | * Traditionally, in this case, receiving a wake-up-indication |
5c548226 OBC |
238 | * was enough and an additional wake-up-ack wasn't needed. |
239 | * This has changed with the BRF6350, which does require an | |
240 | * explicit wake-up-ack. Other BRF versions, which do not | |
241 | * require an explicit ack here, do accept it, thus it is | |
242 | * perfectly safe to always send one. | |
243 | */ | |
244 | BT_DBG("dual wake-up-indication"); | |
245 | /* deliberate fall-through - do not add break */ | |
166d2f6a OBC |
246 | case HCILL_ASLEEP: |
247 | /* acknowledge device wake up */ | |
248 | if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) { | |
249 | BT_ERR("cannot acknowledge device wake up"); | |
250 | goto out; | |
251 | } | |
252 | break; | |
166d2f6a | 253 | default: |
5c548226 | 254 | /* any other state is illegal */ |
166d2f6a OBC |
255 | BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state); |
256 | break; | |
257 | } | |
258 | ||
259 | /* send pending packets and change state to HCILL_AWAKE */ | |
260 | __ll_do_awake(ll); | |
261 | ||
262 | out: | |
263 | spin_unlock_irqrestore(&ll->hcill_lock, flags); | |
264 | ||
265 | /* actually send the packets */ | |
266 | hci_uart_tx_wakeup(hu); | |
267 | } | |
268 | ||
269 | /* | |
270 | * Called upon a sleep-indication from the device | |
271 | */ | |
272 | static void ll_device_want_to_sleep(struct hci_uart *hu) | |
273 | { | |
274 | unsigned long flags; | |
275 | struct ll_struct *ll = hu->priv; | |
276 | ||
277 | BT_DBG("hu %p", hu); | |
278 | ||
279 | /* lock hcill state */ | |
280 | spin_lock_irqsave(&ll->hcill_lock, flags); | |
281 | ||
282 | /* sanity check */ | |
283 | if (ll->hcill_state != HCILL_AWAKE) | |
284 | BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state); | |
285 | ||
286 | /* acknowledge device sleep */ | |
287 | if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) { | |
288 | BT_ERR("cannot acknowledge device sleep"); | |
289 | goto out; | |
290 | } | |
291 | ||
292 | /* update state */ | |
293 | ll->hcill_state = HCILL_ASLEEP; | |
294 | ||
295 | out: | |
296 | spin_unlock_irqrestore(&ll->hcill_lock, flags); | |
297 | ||
298 | /* actually send the sleep ack packet */ | |
299 | hci_uart_tx_wakeup(hu); | |
300 | } | |
301 | ||
302 | /* | |
303 | * Called upon wake-up-acknowledgement from the device | |
304 | */ | |
305 | static void ll_device_woke_up(struct hci_uart *hu) | |
306 | { | |
307 | unsigned long flags; | |
308 | struct ll_struct *ll = hu->priv; | |
309 | ||
310 | BT_DBG("hu %p", hu); | |
311 | ||
312 | /* lock hcill state */ | |
313 | spin_lock_irqsave(&ll->hcill_lock, flags); | |
314 | ||
315 | /* sanity check */ | |
316 | if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE) | |
317 | BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state); | |
318 | ||
319 | /* send pending packets and change state to HCILL_AWAKE */ | |
320 | __ll_do_awake(ll); | |
321 | ||
322 | spin_unlock_irqrestore(&ll->hcill_lock, flags); | |
323 | ||
324 | /* actually send the packets */ | |
325 | hci_uart_tx_wakeup(hu); | |
326 | } | |
327 | ||
328 | /* Enqueue frame for transmittion (padding, crc, etc) */ | |
329 | /* may be called from two simultaneous tasklets */ | |
330 | static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
331 | { | |
332 | unsigned long flags = 0; | |
333 | struct ll_struct *ll = hu->priv; | |
334 | ||
335 | BT_DBG("hu %p skb %p", hu, skb); | |
336 | ||
337 | /* Prepend skb with frame type */ | |
618e8bc2 | 338 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
166d2f6a OBC |
339 | |
340 | /* lock hcill state */ | |
341 | spin_lock_irqsave(&ll->hcill_lock, flags); | |
342 | ||
343 | /* act according to current state */ | |
344 | switch (ll->hcill_state) { | |
345 | case HCILL_AWAKE: | |
346 | BT_DBG("device awake, sending normally"); | |
347 | skb_queue_tail(&ll->txq, skb); | |
348 | break; | |
349 | case HCILL_ASLEEP: | |
350 | BT_DBG("device asleep, waking up and queueing packet"); | |
351 | /* save packet for later */ | |
352 | skb_queue_tail(&ll->tx_wait_q, skb); | |
353 | /* awake device */ | |
354 | if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) { | |
355 | BT_ERR("cannot wake up device"); | |
356 | break; | |
357 | } | |
358 | ll->hcill_state = HCILL_ASLEEP_TO_AWAKE; | |
359 | break; | |
360 | case HCILL_ASLEEP_TO_AWAKE: | |
361 | BT_DBG("device waking up, queueing packet"); | |
362 | /* transient state; just keep packet for later */ | |
363 | skb_queue_tail(&ll->tx_wait_q, skb); | |
364 | break; | |
365 | default: | |
366 | BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state); | |
367 | kfree_skb(skb); | |
368 | break; | |
369 | } | |
370 | ||
371 | spin_unlock_irqrestore(&ll->hcill_lock, flags); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
e1a26170 | 376 | static inline int ll_check_data_len(struct hci_dev *hdev, struct ll_struct *ll, int len) |
166d2f6a | 377 | { |
fc5fef61 | 378 | int room = skb_tailroom(ll->rx_skb); |
166d2f6a OBC |
379 | |
380 | BT_DBG("len %d room %d", len, room); | |
381 | ||
382 | if (!len) { | |
e1a26170 | 383 | hci_recv_frame(hdev, ll->rx_skb); |
166d2f6a OBC |
384 | } else if (len > room) { |
385 | BT_ERR("Data length is too large"); | |
386 | kfree_skb(ll->rx_skb); | |
387 | } else { | |
388 | ll->rx_state = HCILL_W4_DATA; | |
389 | ll->rx_count = len; | |
390 | return len; | |
391 | } | |
392 | ||
393 | ll->rx_state = HCILL_W4_PACKET_TYPE; | |
394 | ll->rx_skb = NULL; | |
395 | ll->rx_count = 0; | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | /* Recv data */ | |
9d1c40eb | 401 | static int ll_recv(struct hci_uart *hu, const void *data, int count) |
166d2f6a OBC |
402 | { |
403 | struct ll_struct *ll = hu->priv; | |
9d1c40eb | 404 | const char *ptr; |
166d2f6a OBC |
405 | struct hci_event_hdr *eh; |
406 | struct hci_acl_hdr *ah; | |
407 | struct hci_sco_hdr *sh; | |
fc5fef61 | 408 | int len, type, dlen; |
166d2f6a OBC |
409 | |
410 | BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count); | |
411 | ||
412 | ptr = data; | |
413 | while (count) { | |
414 | if (ll->rx_count) { | |
415 | len = min_t(unsigned int, ll->rx_count, count); | |
59ae1d12 | 416 | skb_put_data(ll->rx_skb, ptr, len); |
166d2f6a OBC |
417 | ll->rx_count -= len; count -= len; ptr += len; |
418 | ||
419 | if (ll->rx_count) | |
420 | continue; | |
421 | ||
422 | switch (ll->rx_state) { | |
423 | case HCILL_W4_DATA: | |
424 | BT_DBG("Complete data"); | |
e1a26170 | 425 | hci_recv_frame(hu->hdev, ll->rx_skb); |
166d2f6a OBC |
426 | |
427 | ll->rx_state = HCILL_W4_PACKET_TYPE; | |
428 | ll->rx_skb = NULL; | |
429 | continue; | |
430 | ||
431 | case HCILL_W4_EVENT_HDR: | |
acce90d6 | 432 | eh = hci_event_hdr(ll->rx_skb); |
166d2f6a OBC |
433 | |
434 | BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen); | |
435 | ||
e1a26170 | 436 | ll_check_data_len(hu->hdev, ll, eh->plen); |
166d2f6a OBC |
437 | continue; |
438 | ||
439 | case HCILL_W4_ACL_HDR: | |
acce90d6 | 440 | ah = hci_acl_hdr(ll->rx_skb); |
166d2f6a OBC |
441 | dlen = __le16_to_cpu(ah->dlen); |
442 | ||
443 | BT_DBG("ACL header: dlen %d", dlen); | |
444 | ||
e1a26170 | 445 | ll_check_data_len(hu->hdev, ll, dlen); |
166d2f6a OBC |
446 | continue; |
447 | ||
448 | case HCILL_W4_SCO_HDR: | |
acce90d6 | 449 | sh = hci_sco_hdr(ll->rx_skb); |
166d2f6a OBC |
450 | |
451 | BT_DBG("SCO header: dlen %d", sh->dlen); | |
452 | ||
e1a26170 | 453 | ll_check_data_len(hu->hdev, ll, sh->dlen); |
166d2f6a OBC |
454 | continue; |
455 | } | |
456 | } | |
457 | ||
458 | /* HCILL_W4_PACKET_TYPE */ | |
459 | switch (*ptr) { | |
460 | case HCI_EVENT_PKT: | |
461 | BT_DBG("Event packet"); | |
462 | ll->rx_state = HCILL_W4_EVENT_HDR; | |
463 | ll->rx_count = HCI_EVENT_HDR_SIZE; | |
464 | type = HCI_EVENT_PKT; | |
465 | break; | |
466 | ||
467 | case HCI_ACLDATA_PKT: | |
468 | BT_DBG("ACL packet"); | |
469 | ll->rx_state = HCILL_W4_ACL_HDR; | |
470 | ll->rx_count = HCI_ACL_HDR_SIZE; | |
471 | type = HCI_ACLDATA_PKT; | |
472 | break; | |
473 | ||
474 | case HCI_SCODATA_PKT: | |
475 | BT_DBG("SCO packet"); | |
476 | ll->rx_state = HCILL_W4_SCO_HDR; | |
477 | ll->rx_count = HCI_SCO_HDR_SIZE; | |
478 | type = HCI_SCODATA_PKT; | |
479 | break; | |
480 | ||
481 | /* HCILL signals */ | |
482 | case HCILL_GO_TO_SLEEP_IND: | |
483 | BT_DBG("HCILL_GO_TO_SLEEP_IND packet"); | |
484 | ll_device_want_to_sleep(hu); | |
485 | ptr++; count--; | |
486 | continue; | |
487 | ||
488 | case HCILL_GO_TO_SLEEP_ACK: | |
489 | /* shouldn't happen */ | |
490 | BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state); | |
491 | ptr++; count--; | |
492 | continue; | |
493 | ||
494 | case HCILL_WAKE_UP_IND: | |
495 | BT_DBG("HCILL_WAKE_UP_IND packet"); | |
496 | ll_device_want_to_wakeup(hu); | |
497 | ptr++; count--; | |
498 | continue; | |
499 | ||
500 | case HCILL_WAKE_UP_ACK: | |
501 | BT_DBG("HCILL_WAKE_UP_ACK packet"); | |
502 | ll_device_woke_up(hu); | |
503 | ptr++; count--; | |
504 | continue; | |
505 | ||
506 | default: | |
507 | BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr); | |
508 | hu->hdev->stat.err_rx++; | |
509 | ptr++; count--; | |
510 | continue; | |
d650ccae | 511 | } |
166d2f6a OBC |
512 | |
513 | ptr++; count--; | |
514 | ||
515 | /* Allocate packet */ | |
516 | ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC); | |
517 | if (!ll->rx_skb) { | |
518 | BT_ERR("Can't allocate mem for new packet"); | |
519 | ll->rx_state = HCILL_W4_PACKET_TYPE; | |
520 | ll->rx_count = 0; | |
fe1aff71 | 521 | return -ENOMEM; |
166d2f6a OBC |
522 | } |
523 | ||
618e8bc2 | 524 | hci_skb_pkt_type(ll->rx_skb) = type; |
166d2f6a OBC |
525 | } |
526 | ||
527 | return count; | |
528 | } | |
529 | ||
530 | static struct sk_buff *ll_dequeue(struct hci_uart *hu) | |
531 | { | |
532 | struct ll_struct *ll = hu->priv; | |
533 | return skb_dequeue(&ll->txq); | |
534 | } | |
535 | ||
37180552 RH |
536 | #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS) |
537 | static int read_local_version(struct hci_dev *hdev) | |
538 | { | |
539 | int err = 0; | |
540 | unsigned short version = 0; | |
541 | struct sk_buff *skb; | |
542 | struct hci_rp_read_local_version *ver; | |
543 | ||
544 | skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT); | |
545 | if (IS_ERR(skb)) { | |
546 | bt_dev_err(hdev, "Reading TI version information failed (%ld)", | |
547 | PTR_ERR(skb)); | |
f2edd9f6 | 548 | return PTR_ERR(skb); |
37180552 RH |
549 | } |
550 | if (skb->len != sizeof(*ver)) { | |
551 | err = -EILSEQ; | |
552 | goto out; | |
553 | } | |
554 | ||
555 | ver = (struct hci_rp_read_local_version *)skb->data; | |
556 | if (le16_to_cpu(ver->manufacturer) != 13) { | |
557 | err = -ENODEV; | |
558 | goto out; | |
559 | } | |
560 | ||
561 | version = le16_to_cpu(ver->lmp_subver); | |
562 | ||
563 | out: | |
564 | if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err); | |
565 | kfree_skb(skb); | |
566 | return err ? err : version; | |
567 | } | |
568 | ||
569 | /** | |
570 | * download_firmware - | |
571 | * internal function which parses through the .bts firmware | |
572 | * script file intreprets SEND, DELAY actions only as of now | |
573 | */ | |
574 | static int download_firmware(struct ll_device *lldev) | |
575 | { | |
576 | unsigned short chip, min_ver, maj_ver; | |
577 | int version, err, len; | |
578 | unsigned char *ptr, *action_ptr; | |
579 | unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */ | |
580 | const struct firmware *fw; | |
581 | struct sk_buff *skb; | |
582 | struct hci_command *cmd; | |
583 | ||
584 | version = read_local_version(lldev->hu.hdev); | |
585 | if (version < 0) | |
586 | return version; | |
587 | ||
588 | chip = (version & 0x7C00) >> 10; | |
589 | min_ver = (version & 0x007F); | |
590 | maj_ver = (version & 0x0380) >> 7; | |
591 | if (version & 0x8000) | |
592 | maj_ver |= 0x0008; | |
593 | ||
594 | snprintf(bts_scr_name, sizeof(bts_scr_name), | |
595 | "ti-connectivity/TIInit_%d.%d.%d.bts", | |
596 | chip, maj_ver, min_ver); | |
597 | ||
598 | err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev); | |
599 | if (err || !fw->data || !fw->size) { | |
600 | bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s", | |
601 | err, bts_scr_name); | |
602 | return -EINVAL; | |
603 | } | |
604 | ptr = (void *)fw->data; | |
605 | len = fw->size; | |
606 | /* bts_header to remove out magic number and | |
607 | * version | |
608 | */ | |
609 | ptr += sizeof(struct bts_header); | |
610 | len -= sizeof(struct bts_header); | |
611 | ||
612 | while (len > 0 && ptr) { | |
613 | bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ", | |
614 | ((struct bts_action *)ptr)->size, | |
615 | ((struct bts_action *)ptr)->type); | |
616 | ||
617 | action_ptr = &(((struct bts_action *)ptr)->data[0]); | |
618 | ||
619 | switch (((struct bts_action *)ptr)->type) { | |
620 | case ACTION_SEND_COMMAND: /* action send */ | |
621 | bt_dev_dbg(lldev->hu.hdev, "S"); | |
622 | cmd = (struct hci_command *)action_ptr; | |
623 | if (cmd->opcode == 0xff36) { | |
624 | /* ignore remote change | |
625 | * baud rate HCI VS command */ | |
626 | bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware"); | |
627 | break; | |
628 | } | |
629 | if (cmd->prefix != 1) | |
630 | bt_dev_dbg(lldev->hu.hdev, "command type %d\n", cmd->prefix); | |
631 | ||
632 | skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT); | |
633 | if (IS_ERR(skb)) { | |
634 | bt_dev_err(lldev->hu.hdev, "send command failed\n"); | |
823b8420 | 635 | err = PTR_ERR(skb); |
37180552 RH |
636 | goto out_rel_fw; |
637 | } | |
638 | kfree_skb(skb); | |
639 | break; | |
640 | case ACTION_WAIT_EVENT: /* wait */ | |
641 | /* no need to wait as command was synchronous */ | |
642 | bt_dev_dbg(lldev->hu.hdev, "W"); | |
643 | break; | |
644 | case ACTION_DELAY: /* sleep */ | |
645 | bt_dev_info(lldev->hu.hdev, "sleep command in scr"); | |
646 | mdelay(((struct bts_action_delay *)action_ptr)->msec); | |
647 | break; | |
648 | } | |
649 | len -= (sizeof(struct bts_action) + | |
650 | ((struct bts_action *)ptr)->size); | |
651 | ptr += sizeof(struct bts_action) + | |
652 | ((struct bts_action *)ptr)->size; | |
653 | } | |
654 | ||
655 | out_rel_fw: | |
656 | /* fw download complete */ | |
657 | release_firmware(fw); | |
658 | return err; | |
659 | } | |
660 | ||
661 | static int ll_setup(struct hci_uart *hu) | |
662 | { | |
663 | int err, retry = 3; | |
664 | struct ll_device *lldev; | |
665 | struct serdev_device *serdev = hu->serdev; | |
666 | u32 speed; | |
667 | ||
668 | if (!serdev) | |
669 | return 0; | |
670 | ||
671 | lldev = serdev_device_get_drvdata(serdev); | |
672 | ||
673 | serdev_device_set_flow_control(serdev, true); | |
674 | ||
675 | do { | |
676 | /* Configure BT_EN to HIGH state */ | |
677 | gpiod_set_value_cansleep(lldev->enable_gpio, 0); | |
678 | msleep(5); | |
679 | gpiod_set_value_cansleep(lldev->enable_gpio, 1); | |
680 | msleep(100); | |
681 | ||
682 | err = download_firmware(lldev); | |
683 | if (!err) | |
684 | break; | |
685 | ||
686 | /* Toggle BT_EN and retry */ | |
687 | bt_dev_err(hu->hdev, "download firmware failed, retrying..."); | |
688 | } while (retry--); | |
689 | ||
690 | if (err) | |
691 | return err; | |
692 | ||
693 | /* Operational speed if any */ | |
694 | if (hu->oper_speed) | |
695 | speed = hu->oper_speed; | |
696 | else if (hu->proto->oper_speed) | |
697 | speed = hu->proto->oper_speed; | |
698 | else | |
699 | speed = 0; | |
700 | ||
701 | if (speed) { | |
702 | struct sk_buff *skb = __hci_cmd_sync(hu->hdev, 0xff36, sizeof(speed), &speed, HCI_INIT_TIMEOUT); | |
703 | if (!IS_ERR(skb)) { | |
704 | kfree_skb(skb); | |
705 | serdev_device_set_baudrate(serdev, speed); | |
706 | } | |
707 | } | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | static const struct hci_uart_proto llp; | |
713 | ||
714 | static int hci_ti_probe(struct serdev_device *serdev) | |
715 | { | |
716 | struct hci_uart *hu; | |
717 | struct ll_device *lldev; | |
718 | u32 max_speed = 3000000; | |
719 | ||
720 | lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL); | |
721 | if (!lldev) | |
722 | return -ENOMEM; | |
723 | hu = &lldev->hu; | |
724 | ||
725 | serdev_device_set_drvdata(serdev, lldev); | |
726 | lldev->serdev = hu->serdev = serdev; | |
727 | ||
728 | lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW); | |
729 | if (IS_ERR(lldev->enable_gpio)) | |
730 | return PTR_ERR(lldev->enable_gpio); | |
731 | ||
43d3d092 UH |
732 | lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock"); |
733 | if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT) | |
734 | return PTR_ERR(lldev->ext_clk); | |
735 | ||
37180552 RH |
736 | of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed); |
737 | hci_uart_set_speeds(hu, 115200, max_speed); | |
738 | ||
739 | return hci_uart_register_device(hu, &llp); | |
740 | } | |
741 | ||
742 | static void hci_ti_remove(struct serdev_device *serdev) | |
743 | { | |
744 | struct ll_device *lldev = serdev_device_get_drvdata(serdev); | |
745 | struct hci_uart *hu = &lldev->hu; | |
746 | struct hci_dev *hdev = hu->hdev; | |
747 | ||
748 | cancel_work_sync(&hu->write_work); | |
749 | ||
750 | hci_unregister_dev(hdev); | |
751 | hci_free_dev(hdev); | |
752 | hu->proto->close(hu); | |
753 | } | |
754 | ||
755 | static const struct of_device_id hci_ti_of_match[] = { | |
c127a871 SR |
756 | { .compatible = "ti,wl1271-st" }, |
757 | { .compatible = "ti,wl1273-st" }, | |
758 | { .compatible = "ti,wl1281-st" }, | |
759 | { .compatible = "ti,wl1283-st" }, | |
760 | { .compatible = "ti,wl1285-st" }, | |
761 | { .compatible = "ti,wl1801-st" }, | |
762 | { .compatible = "ti,wl1805-st" }, | |
763 | { .compatible = "ti,wl1807-st" }, | |
37180552 RH |
764 | { .compatible = "ti,wl1831-st" }, |
765 | { .compatible = "ti,wl1835-st" }, | |
766 | { .compatible = "ti,wl1837-st" }, | |
767 | {}, | |
768 | }; | |
769 | MODULE_DEVICE_TABLE(of, hci_ti_of_match); | |
770 | ||
771 | static struct serdev_device_driver hci_ti_drv = { | |
772 | .driver = { | |
773 | .name = "hci-ti", | |
774 | .of_match_table = of_match_ptr(hci_ti_of_match), | |
775 | }, | |
776 | .probe = hci_ti_probe, | |
777 | .remove = hci_ti_remove, | |
778 | }; | |
779 | #else | |
780 | #define ll_setup NULL | |
781 | #endif | |
782 | ||
4ee7ef19 | 783 | static const struct hci_uart_proto llp = { |
166d2f6a | 784 | .id = HCI_UART_LL, |
7c40fb8d | 785 | .name = "LL", |
37180552 | 786 | .setup = ll_setup, |
166d2f6a OBC |
787 | .open = ll_open, |
788 | .close = ll_close, | |
789 | .recv = ll_recv, | |
790 | .enqueue = ll_enqueue, | |
791 | .dequeue = ll_dequeue, | |
792 | .flush = ll_flush, | |
793 | }; | |
794 | ||
f2b94bb9 | 795 | int __init ll_init(void) |
166d2f6a | 796 | { |
37180552 RH |
797 | serdev_device_driver_register(&hci_ti_drv); |
798 | ||
01009eec | 799 | return hci_uart_register_proto(&llp); |
166d2f6a OBC |
800 | } |
801 | ||
f2b94bb9 | 802 | int __exit ll_deinit(void) |
166d2f6a | 803 | { |
37180552 RH |
804 | serdev_device_driver_unregister(&hci_ti_drv); |
805 | ||
166d2f6a OBC |
806 | return hci_uart_unregister_proto(&llp); |
807 | } |