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Bluetooth: Remove redundant disable_advertising()
[linux-block.git] / drivers / bluetooth / hci_ll.c
CommitLineData
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
7c6ca120
DL		 59/* Vendor-specific HCI commands */
60#define HCI_VS_UPDATE_UART_HCI_BAUDRATE 0xff36
61
166d2f6a
OBC		 62/* HCILL commands */
63#define HCILL_GO_TO_SLEEP_IND 0x30
64#define HCILL_GO_TO_SLEEP_ACK 0x31
65#define HCILL_WAKE_UP_IND 0x32
66#define HCILL_WAKE_UP_ACK 0x33
67
68/* HCILL receiver States */
69#define HCILL_W4_PACKET_TYPE 0
70#define HCILL_W4_EVENT_HDR 1
71#define HCILL_W4_ACL_HDR 2
72#define HCILL_W4_SCO_HDR 3
73#define HCILL_W4_DATA 4
74
75/* HCILL states */
76enum hcill_states_e {
77 HCILL_ASLEEP,
78 HCILL_ASLEEP_TO_AWAKE,
79 HCILL_AWAKE,
80 HCILL_AWAKE_TO_ASLEEP
81};
82
83struct hcill_cmd {
84 u8 cmd;
81ca405a 85} __packed;
166d2f6a 86
37180552
RH		 87struct ll_device {
88 struct hci_uart hu;
89 struct serdev_device *serdev;
90 struct gpio_desc *enable_gpio;
43d3d092 91 struct clk *ext_clk;
37180552
RH		 92};
93
166d2f6a
OBC		 94struct ll_struct {
95 unsigned long rx_state;
96 unsigned long rx_count;
97 struct sk_buff *rx_skb;
98 struct sk_buff_head txq;
99 spinlock_t hcill_lock; /* HCILL state lock */
100 unsigned long hcill_state; /* HCILL power state */
101 struct sk_buff_head tx_wait_q; /* HCILL wait queue */
102};
103
104/*
105 * Builds and sends an HCILL command packet.
106 * These are very simple packets with only 1 cmd byte
107 */
108static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
109{
110 int err = 0;
111 struct sk_buff *skb = NULL;
112 struct ll_struct *ll = hu->priv;
113 struct hcill_cmd *hcill_packet;
114
115 BT_DBG("hu %p cmd 0x%x", hu, cmd);
116
117 /* allocate packet */
118 skb = bt_skb_alloc(1, GFP_ATOMIC);
119 if (!skb) {
120 BT_ERR("cannot allocate memory for HCILL packet");
121 err = -ENOMEM;
122 goto out;
123 }
124
125 /* prepare packet */
4df864c1 126 hcill_packet = skb_put(skb, 1);
166d2f6a 127 hcill_packet->cmd = cmd;
166d2f6a
OBC		 128
129 /* send packet */
130 skb_queue_tail(&ll->txq, skb);
131out:
132 return err;
133}
134
135/* Initialize protocol */
136static int ll_open(struct hci_uart *hu)
137{
138 struct ll_struct *ll;
139
140 BT_DBG("hu %p", hu);
141
9eb648c3 142 ll = kzalloc(sizeof(*ll), GFP_KERNEL);
166d2f6a
OBC		 143 if (!ll)
144 return -ENOMEM;
145
146 skb_queue_head_init(&ll->txq);
147 skb_queue_head_init(&ll->tx_wait_q);
148 spin_lock_init(&ll->hcill_lock);
149
150 ll->hcill_state = HCILL_AWAKE;
151
152 hu->priv = ll;
153
43d3d092
UH		 154 if (hu->serdev) {
155 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
37180552 156 serdev_device_open(hu->serdev);
43d3d092
UH		 157 if (!IS_ERR(lldev->ext_clk))
158 clk_prepare_enable(lldev->ext_clk);
159 }
37180552 160
166d2f6a
OBC		 161 return 0;
162}
163
164/* Flush protocol data */
165static int ll_flush(struct hci_uart *hu)
166{
167 struct ll_struct *ll = hu->priv;
168
169 BT_DBG("hu %p", hu);
170
171 skb_queue_purge(&ll->tx_wait_q);
172 skb_queue_purge(&ll->txq);
173
174 return 0;
175}
176
177/* Close protocol */
178static int ll_close(struct hci_uart *hu)
179{
180 struct ll_struct *ll = hu->priv;
181
182 BT_DBG("hu %p", hu);
183
184 skb_queue_purge(&ll->tx_wait_q);
185 skb_queue_purge(&ll->txq);
186
b1fb0683 187 kfree_skb(ll->rx_skb);
166d2f6a 188
37180552
RH		 189 if (hu->serdev) {
190 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
191 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
192
43d3d092
UH		 193 clk_disable_unprepare(lldev->ext_clk);
194
37180552
RH		 195 serdev_device_close(hu->serdev);
196 }
197
166d2f6a
OBC		 198 hu->priv = NULL;
199
200 kfree(ll);
201
202 return 0;
203}
204
205/*
206 * internal function, which does common work of the device wake up process:
207 * 1. places all pending packets (waiting in tx_wait_q list) in txq list.
208 * 2. changes internal state to HCILL_AWAKE.
209 * Note: assumes that hcill_lock spinlock is taken,
210 * shouldn't be called otherwise!
211 */
212static void __ll_do_awake(struct ll_struct *ll)
213{
214 struct sk_buff *skb = NULL;
215
216 while ((skb = skb_dequeue(&ll->tx_wait_q)))
217 skb_queue_tail(&ll->txq, skb);
218
219 ll->hcill_state = HCILL_AWAKE;
220}
221
222/*
223 * Called upon a wake-up-indication from the device
224 */
225static void ll_device_want_to_wakeup(struct hci_uart *hu)
226{
227 unsigned long flags;
228 struct ll_struct *ll = hu->priv;
229
230 BT_DBG("hu %p", hu);
231
232 /* lock hcill state */
233 spin_lock_irqsave(&ll->hcill_lock, flags);
234
235 switch (ll->hcill_state) {
5c548226
OBC		 236 case HCILL_ASLEEP_TO_AWAKE:
237 /*
238 * This state means that both the host and the BRF chip
239 * have simultaneously sent a wake-up-indication packet.
25985edc 240 * Traditionally, in this case, receiving a wake-up-indication
5c548226
OBC		 241 * was enough and an additional wake-up-ack wasn't needed.
242 * This has changed with the BRF6350, which does require an
243 * explicit wake-up-ack. Other BRF versions, which do not
244 * require an explicit ack here, do accept it, thus it is
245 * perfectly safe to always send one.
246 */
247 BT_DBG("dual wake-up-indication");
fac72b24 248 /* fall through */
166d2f6a
OBC		 249 case HCILL_ASLEEP:
250 /* acknowledge device wake up */
251 if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
252 BT_ERR("cannot acknowledge device wake up");
253 goto out;
254 }
255 break;
166d2f6a 256 default:
5c548226 257 /* any other state is illegal */
166d2f6a
OBC		 258 BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
259 break;
260 }
261
262 /* send pending packets and change state to HCILL_AWAKE */
263 __ll_do_awake(ll);
264
265out:
266 spin_unlock_irqrestore(&ll->hcill_lock, flags);
267
268 /* actually send the packets */
269 hci_uart_tx_wakeup(hu);
270}
271
272/*
273 * Called upon a sleep-indication from the device
274 */
275static void ll_device_want_to_sleep(struct hci_uart *hu)
276{
277 unsigned long flags;
278 struct ll_struct *ll = hu->priv;
279
280 BT_DBG("hu %p", hu);
281
282 /* lock hcill state */
283 spin_lock_irqsave(&ll->hcill_lock, flags);
284
285 /* sanity check */
286 if (ll->hcill_state != HCILL_AWAKE)
287 BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);
288
289 /* acknowledge device sleep */
290 if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
291 BT_ERR("cannot acknowledge device sleep");
292 goto out;
293 }
294
295 /* update state */
296 ll->hcill_state = HCILL_ASLEEP;
297
298out:
299 spin_unlock_irqrestore(&ll->hcill_lock, flags);
300
301 /* actually send the sleep ack packet */
302 hci_uart_tx_wakeup(hu);
303}
304
305/*
306 * Called upon wake-up-acknowledgement from the device
307 */
308static void ll_device_woke_up(struct hci_uart *hu)
309{
310 unsigned long flags;
311 struct ll_struct *ll = hu->priv;
312
313 BT_DBG("hu %p", hu);
314
315 /* lock hcill state */
316 spin_lock_irqsave(&ll->hcill_lock, flags);
317
318 /* sanity check */
319 if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
320 BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);
321
322 /* send pending packets and change state to HCILL_AWAKE */
323 __ll_do_awake(ll);
324
325 spin_unlock_irqrestore(&ll->hcill_lock, flags);
326
327 /* actually send the packets */
328 hci_uart_tx_wakeup(hu);
329}
330
331/* Enqueue frame for transmittion (padding, crc, etc) */
332/* may be called from two simultaneous tasklets */
333static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
334{
335 unsigned long flags = 0;
336 struct ll_struct *ll = hu->priv;
337
338 BT_DBG("hu %p skb %p", hu, skb);
339
340 /* Prepend skb with frame type */
618e8bc2 341 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
166d2f6a
OBC		 342
343 /* lock hcill state */
344 spin_lock_irqsave(&ll->hcill_lock, flags);
345
346 /* act according to current state */
347 switch (ll->hcill_state) {
348 case HCILL_AWAKE:
349 BT_DBG("device awake, sending normally");
350 skb_queue_tail(&ll->txq, skb);
351 break;
352 case HCILL_ASLEEP:
353 BT_DBG("device asleep, waking up and queueing packet");
354 /* save packet for later */
355 skb_queue_tail(&ll->tx_wait_q, skb);
356 /* awake device */
357 if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
358 BT_ERR("cannot wake up device");
359 break;
360 }
361 ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
362 break;
363 case HCILL_ASLEEP_TO_AWAKE:
364 BT_DBG("device waking up, queueing packet");
365 /* transient state; just keep packet for later */
366 skb_queue_tail(&ll->tx_wait_q, skb);
367 break;
368 default:
369 BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
370 kfree_skb(skb);
371 break;
372 }
373
374 spin_unlock_irqrestore(&ll->hcill_lock, flags);
375
376 return 0;
377}
378
e1a26170 379static inline int ll_check_data_len(struct hci_dev *hdev, struct ll_struct *ll, int len)
166d2f6a 380{
fc5fef61 381 int room = skb_tailroom(ll->rx_skb);
166d2f6a
OBC		 382
383 BT_DBG("len %d room %d", len, room);
384
385 if (!len) {
e1a26170 386 hci_recv_frame(hdev, ll->rx_skb);
166d2f6a
OBC		 387 } else if (len > room) {
388 BT_ERR("Data length is too large");
389 kfree_skb(ll->rx_skb);
390 } else {
391 ll->rx_state = HCILL_W4_DATA;
392 ll->rx_count = len;
393 return len;
394 }
395
396 ll->rx_state = HCILL_W4_PACKET_TYPE;
397 ll->rx_skb = NULL;
398 ll->rx_count = 0;
399
400 return 0;
401}
402
403/* Recv data */
9d1c40eb 404static int ll_recv(struct hci_uart *hu, const void *data, int count)
166d2f6a
OBC		 405{
406 struct ll_struct *ll = hu->priv;
9d1c40eb 407 const char *ptr;
166d2f6a
OBC		 408 struct hci_event_hdr *eh;
409 struct hci_acl_hdr *ah;
410 struct hci_sco_hdr *sh;
fc5fef61 411 int len, type, dlen;
166d2f6a
OBC		 412
413 BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);
414
415 ptr = data;
416 while (count) {
417 if (ll->rx_count) {
418 len = min_t(unsigned int, ll->rx_count, count);
59ae1d12 419 skb_put_data(ll->rx_skb, ptr, len);
166d2f6a
OBC		 420 ll->rx_count -= len; count -= len; ptr += len;
421
422 if (ll->rx_count)
423 continue;
424
425 switch (ll->rx_state) {
426 case HCILL_W4_DATA:
427 BT_DBG("Complete data");
e1a26170 428 hci_recv_frame(hu->hdev, ll->rx_skb);
166d2f6a
OBC		 429
430 ll->rx_state = HCILL_W4_PACKET_TYPE;
431 ll->rx_skb = NULL;
432 continue;
433
434 case HCILL_W4_EVENT_HDR:
acce90d6 435 eh = hci_event_hdr(ll->rx_skb);
166d2f6a
OBC		 436
437 BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
438
e1a26170 439 ll_check_data_len(hu->hdev, ll, eh->plen);
166d2f6a
OBC		 440 continue;
441
442 case HCILL_W4_ACL_HDR:
acce90d6 443 ah = hci_acl_hdr(ll->rx_skb);
166d2f6a
OBC		 444 dlen = __le16_to_cpu(ah->dlen);
445
446 BT_DBG("ACL header: dlen %d", dlen);
447
e1a26170 448 ll_check_data_len(hu->hdev, ll, dlen);
166d2f6a
OBC		 449 continue;
450
451 case HCILL_W4_SCO_HDR:
acce90d6 452 sh = hci_sco_hdr(ll->rx_skb);
166d2f6a
OBC		 453
454 BT_DBG("SCO header: dlen %d", sh->dlen);
455
e1a26170 456 ll_check_data_len(hu->hdev, ll, sh->dlen);
166d2f6a
OBC		 457 continue;
458 }
459 }
460
461 /* HCILL_W4_PACKET_TYPE */
462 switch (*ptr) {
463 case HCI_EVENT_PKT:
464 BT_DBG("Event packet");
465 ll->rx_state = HCILL_W4_EVENT_HDR;
466 ll->rx_count = HCI_EVENT_HDR_SIZE;
467 type = HCI_EVENT_PKT;
468 break;
469
470 case HCI_ACLDATA_PKT:
471 BT_DBG("ACL packet");
472 ll->rx_state = HCILL_W4_ACL_HDR;
473 ll->rx_count = HCI_ACL_HDR_SIZE;
474 type = HCI_ACLDATA_PKT;
475 break;
476
477 case HCI_SCODATA_PKT:
478 BT_DBG("SCO packet");
479 ll->rx_state = HCILL_W4_SCO_HDR;
480 ll->rx_count = HCI_SCO_HDR_SIZE;
481 type = HCI_SCODATA_PKT;
482 break;
483
484 /* HCILL signals */
485 case HCILL_GO_TO_SLEEP_IND:
486 BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
487 ll_device_want_to_sleep(hu);
488 ptr++; count--;
489 continue;
490
491 case HCILL_GO_TO_SLEEP_ACK:
492 /* shouldn't happen */
493 BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
494 ptr++; count--;
495 continue;
496
497 case HCILL_WAKE_UP_IND:
498 BT_DBG("HCILL_WAKE_UP_IND packet");
499 ll_device_want_to_wakeup(hu);
500 ptr++; count--;
501 continue;
502
503 case HCILL_WAKE_UP_ACK:
504 BT_DBG("HCILL_WAKE_UP_ACK packet");
505 ll_device_woke_up(hu);
506 ptr++; count--;
507 continue;
508
509 default:
510 BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
511 hu->hdev->stat.err_rx++;
512 ptr++; count--;
513 continue;
d650ccae 514 }
166d2f6a
OBC		 515
516 ptr++; count--;
517
518 /* Allocate packet */
519 ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
520 if (!ll->rx_skb) {
521 BT_ERR("Can't allocate mem for new packet");
522 ll->rx_state = HCILL_W4_PACKET_TYPE;
523 ll->rx_count = 0;
fe1aff71 524 return -ENOMEM;
166d2f6a
OBC		 525 }
526
618e8bc2 527 hci_skb_pkt_type(ll->rx_skb) = type;
166d2f6a
OBC		 528 }
529
530 return count;
531}
532
533static struct sk_buff *ll_dequeue(struct hci_uart *hu)
534{
535 struct ll_struct *ll = hu->priv;
536 return skb_dequeue(&ll->txq);
537}
538
37180552
RH		 539#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
540static int read_local_version(struct hci_dev *hdev)
541{
542 int err = 0;
543 unsigned short version = 0;
544 struct sk_buff *skb;
545 struct hci_rp_read_local_version *ver;
546
547 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT);
548 if (IS_ERR(skb)) {
549 bt_dev_err(hdev, "Reading TI version information failed (%ld)",
550 PTR_ERR(skb));
f2edd9f6 551 return PTR_ERR(skb);
37180552
RH		 552 }
553 if (skb->len != sizeof(*ver)) {
554 err = -EILSEQ;
555 goto out;
556 }
557
558 ver = (struct hci_rp_read_local_version *)skb->data;
559 if (le16_to_cpu(ver->manufacturer) != 13) {
560 err = -ENODEV;
561 goto out;
562 }
563
564 version = le16_to_cpu(ver->lmp_subver);
565
566out:
567 if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err);
568 kfree_skb(skb);
569 return err ? err : version;
570}
571
572/**
573 * download_firmware -
574 * internal function which parses through the .bts firmware
575 * script file intreprets SEND, DELAY actions only as of now
576 */
577static int download_firmware(struct ll_device *lldev)
578{
579 unsigned short chip, min_ver, maj_ver;
580 int version, err, len;
581 unsigned char *ptr, *action_ptr;
582 unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */
583 const struct firmware *fw;
584 struct sk_buff *skb;
585 struct hci_command *cmd;
586
587 version = read_local_version(lldev->hu.hdev);
588 if (version < 0)
589 return version;
590
591 chip = (version & 0x7C00) >> 10;
592 min_ver = (version & 0x007F);
593 maj_ver = (version & 0x0380) >> 7;
594 if (version & 0x8000)
595 maj_ver |= 0x0008;
596
597 snprintf(bts_scr_name, sizeof(bts_scr_name),
598 "ti-connectivity/TIInit_%d.%d.%d.bts",
599 chip, maj_ver, min_ver);
600
601 err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev);
602 if (err || !fw->data || !fw->size) {
603 bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s",
604 err, bts_scr_name);
605 return -EINVAL;
606 }
607 ptr = (void *)fw->data;
608 len = fw->size;
609 /* bts_header to remove out magic number and
610 * version
611 */
612 ptr += sizeof(struct bts_header);
613 len -= sizeof(struct bts_header);
614
615 while (len > 0 && ptr) {
616 bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ",
617 ((struct bts_action *)ptr)->size,
618 ((struct bts_action *)ptr)->type);
619
620 action_ptr = &(((struct bts_action *)ptr)->data[0]);
621
622 switch (((struct bts_action *)ptr)->type) {
623 case ACTION_SEND_COMMAND: /* action send */
624 bt_dev_dbg(lldev->hu.hdev, "S");
625 cmd = (struct hci_command *)action_ptr;
7c6ca120 626 if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) {
37180552 627 /* ignore remote change
d98422cb
DR		 628 * baud rate HCI VS command
629 */
37180552
RH		 630 bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware");
631 break;
632 }
633 if (cmd->prefix != 1)
059fb823 634 bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix);
37180552
RH		 635
636 skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT);
637 if (IS_ERR(skb)) {
059fb823 638 bt_dev_err(lldev->hu.hdev, "send command failed");
823b8420 639 err = PTR_ERR(skb);
37180552
RH		 640 goto out_rel_fw;
641 }
642 kfree_skb(skb);
643 break;
644 case ACTION_WAIT_EVENT: /* wait */
645 /* no need to wait as command was synchronous */
646 bt_dev_dbg(lldev->hu.hdev, "W");
647 break;
648 case ACTION_DELAY: /* sleep */
649 bt_dev_info(lldev->hu.hdev, "sleep command in scr");
650 mdelay(((struct bts_action_delay *)action_ptr)->msec);
651 break;
652 }
653 len -= (sizeof(struct bts_action) +
654 ((struct bts_action *)ptr)->size);
655 ptr += sizeof(struct bts_action) +
656 ((struct bts_action *)ptr)->size;
657 }
658
659out_rel_fw:
660 /* fw download complete */
661 release_firmware(fw);
662 return err;
663}
664
665static int ll_setup(struct hci_uart *hu)
666{
667 int err, retry = 3;
668 struct ll_device *lldev;
669 struct serdev_device *serdev = hu->serdev;
670 u32 speed;
671
672 if (!serdev)
673 return 0;
674
675 lldev = serdev_device_get_drvdata(serdev);
676
677 serdev_device_set_flow_control(serdev, true);
678
679 do {
d54fdcf9 680 /* Reset the Bluetooth device */
37180552
RH		 681 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
682 msleep(5);
683 gpiod_set_value_cansleep(lldev->enable_gpio, 1);
d54fdcf9
DL		 684 err = serdev_device_wait_for_cts(serdev, true, 200);
685 if (err) {
686 bt_dev_err(hu->hdev, "Failed to get CTS");
687 return err;
688 }
37180552
RH		 689
690 err = download_firmware(lldev);
691 if (!err)
692 break;
693
694 /* Toggle BT_EN and retry */
695 bt_dev_err(hu->hdev, "download firmware failed, retrying...");
696 } while (retry--);
697
698 if (err)
699 return err;
700
701 /* Operational speed if any */
702 if (hu->oper_speed)
703 speed = hu->oper_speed;
704 else if (hu->proto->oper_speed)
705 speed = hu->proto->oper_speed;
706 else
707 speed = 0;
708
709 if (speed) {
c30b93ea 710 __le32 speed_le = cpu_to_le32(speed);
7c6ca120
DL		 711 struct sk_buff *skb;
712
713 skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE,
c30b93ea
DL		 714 sizeof(speed_le), &speed_le,
715 HCI_INIT_TIMEOUT);
37180552
RH		 716 if (!IS_ERR(skb)) {
717 kfree_skb(skb);
718 serdev_device_set_baudrate(serdev, speed);
719 }
720 }
721
722 return 0;
723}
724
725static const struct hci_uart_proto llp;
726
727static int hci_ti_probe(struct serdev_device *serdev)
728{
729 struct hci_uart *hu;
730 struct ll_device *lldev;
731 u32 max_speed = 3000000;
732
733 lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL);
734 if (!lldev)
735 return -ENOMEM;
736 hu = &lldev->hu;
737
738 serdev_device_set_drvdata(serdev, lldev);
739 lldev->serdev = hu->serdev = serdev;
740
741 lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW);
742 if (IS_ERR(lldev->enable_gpio))
743 return PTR_ERR(lldev->enable_gpio);
744
43d3d092
UH		 745 lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
746 if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
747 return PTR_ERR(lldev->ext_clk);
748
37180552
RH		 749 of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
750 hci_uart_set_speeds(hu, 115200, max_speed);
751
752 return hci_uart_register_device(hu, &llp);
753}
754
755static void hci_ti_remove(struct serdev_device *serdev)
756{
757 struct ll_device *lldev = serdev_device_get_drvdata(serdev);
37180552 758
37f5258d 759 hci_uart_unregister_device(&lldev->hu);
37180552
RH		 760}
761
762static const struct of_device_id hci_ti_of_match[] = {
c127a871
SR		 763 { .compatible = "ti,wl1271-st" },
764 { .compatible = "ti,wl1273-st" },
765 { .compatible = "ti,wl1281-st" },
766 { .compatible = "ti,wl1283-st" },
767 { .compatible = "ti,wl1285-st" },
768 { .compatible = "ti,wl1801-st" },
769 { .compatible = "ti,wl1805-st" },
770 { .compatible = "ti,wl1807-st" },
37180552
RH		 771 { .compatible = "ti,wl1831-st" },
772 { .compatible = "ti,wl1835-st" },
773 { .compatible = "ti,wl1837-st" },
774 {},
775};
776MODULE_DEVICE_TABLE(of, hci_ti_of_match);
777
778static struct serdev_device_driver hci_ti_drv = {
779 .driver = {
780 .name = "hci-ti",
781 .of_match_table = of_match_ptr(hci_ti_of_match),
782 },
783 .probe = hci_ti_probe,
784 .remove = hci_ti_remove,
785};
786#else
787#define ll_setup NULL
788#endif
789
4ee7ef19 790static const struct hci_uart_proto llp = {
166d2f6a 791 .id = HCI_UART_LL,
7c40fb8d 792 .name = "LL",
37180552 793 .setup = ll_setup,
166d2f6a
OBC		 794 .open = ll_open,
795 .close = ll_close,
796 .recv = ll_recv,
797 .enqueue = ll_enqueue,
798 .dequeue = ll_dequeue,
799 .flush = ll_flush,
800};
801
f2b94bb9 802int __init ll_init(void)
166d2f6a 803{
37180552
RH		 804 serdev_device_driver_register(&hci_ti_drv);
805
01009eec 806 return hci_uart_register_proto(&llp);
166d2f6a
OBC		 807}
808
f2b94bb9 809int __exit ll_deinit(void)
166d2f6a 810{
37180552
RH		 811 serdev_device_driver_unregister(&hci_ti_drv);
812
166d2f6a
OBC		 813 return hci_uart_unregister_proto(&llp);
814}
Linux 6.x block layer and io_uring tree(s)