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>
37#include <linux/firmware.h>
38#include <linux/interrupt.h>
39#include <linux/ptrace.h>
40#include <linux/poll.h>
41
42#include <linux/slab.h>
43#include <linux/errno.h>
44#include <linux/string.h>
45#include <linux/signal.h>
46#include <linux/ioctl.h>
47#include <linux/of.h>
48#include <linux/serdev.h>
49#include <linux/skbuff.h>
50#include <linux/ti_wilink_st.h>
51#include <linux/clk.h>
52
53#include <net/bluetooth/bluetooth.h>
54#include <net/bluetooth/hci_core.h>
55#include <linux/gpio/consumer.h>
56#include <linux/nvmem-consumer.h>
57
58#include "hci_uart.h"
59
60/* Vendor-specific HCI commands */
61#define HCI_VS_WRITE_BD_ADDR 0xfc06
62#define HCI_VS_UPDATE_UART_HCI_BAUDRATE 0xff36
63
64/* HCILL commands */
65#define HCILL_GO_TO_SLEEP_IND 0x30
66#define HCILL_GO_TO_SLEEP_ACK 0x31
67#define HCILL_WAKE_UP_IND 0x32
68#define HCILL_WAKE_UP_ACK 0x33
69
70/* HCILL states */
71enum hcill_states_e {
72 HCILL_ASLEEP,
73 HCILL_ASLEEP_TO_AWAKE,
74 HCILL_AWAKE,
75 HCILL_AWAKE_TO_ASLEEP
76};
77
78struct ll_device {
79 struct hci_uart hu;
80 struct serdev_device *serdev;
81 struct gpio_desc *enable_gpio;
82 struct clk *ext_clk;
83 bdaddr_t bdaddr;
84};
85
86struct ll_struct {
87 struct sk_buff *rx_skb;
88 struct sk_buff_head txq;
89 spinlock_t hcill_lock; /* HCILL state lock */
90 unsigned long hcill_state; /* HCILL power state */
91 struct sk_buff_head tx_wait_q; /* HCILL wait queue */
92};
93
94/*
95 * Builds and sends an HCILL command packet.
96 * These are very simple packets with only 1 cmd byte
97 */
98static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
99{
100 int err = 0;
101 struct sk_buff *skb = NULL;
102 struct ll_struct *ll = hu->priv;
103
104 BT_DBG("hu %p cmd 0x%x", hu, cmd);
105
106 /* allocate packet */
107 skb = bt_skb_alloc(1, GFP_ATOMIC);
108 if (!skb) {
109 BT_ERR("cannot allocate memory for HCILL packet");
110 err = -ENOMEM;
111 goto out;
112 }
113
114 /* prepare packet */
115 skb_put_u8(skb, cmd);
116
117 /* send packet */
118 skb_queue_tail(&ll->txq, skb);
119out:
120 return err;
121}
122
123/* Initialize protocol */
124static int ll_open(struct hci_uart *hu)
125{
126 struct ll_struct *ll;
127
128 BT_DBG("hu %p", hu);
129
130 ll = kzalloc(sizeof(*ll), GFP_KERNEL);
131 if (!ll)
132 return -ENOMEM;
133
134 skb_queue_head_init(&ll->txq);
135 skb_queue_head_init(&ll->tx_wait_q);
136 spin_lock_init(&ll->hcill_lock);
137
138 ll->hcill_state = HCILL_AWAKE;
139
140 hu->priv = ll;
141
142 if (hu->serdev) {
143 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
144 if (!IS_ERR(lldev->ext_clk))
145 clk_prepare_enable(lldev->ext_clk);
146 }
147
148 return 0;
149}
150
151/* Flush protocol data */
152static int ll_flush(struct hci_uart *hu)
153{
154 struct ll_struct *ll = hu->priv;
155
156 BT_DBG("hu %p", hu);
157
158 skb_queue_purge(&ll->tx_wait_q);
159 skb_queue_purge(&ll->txq);
160
161 return 0;
162}
163
164/* Close protocol */
165static int ll_close(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 kfree_skb(ll->rx_skb);
175
176 if (hu->serdev) {
177 struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
178 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
179
180 clk_disable_unprepare(lldev->ext_clk);
181 }
182
183 hu->priv = NULL;
184
185 kfree(ll);
186
187 return 0;
188}
189
190/*
191 * internal function, which does common work of the device wake up process:
192 * 1. places all pending packets (waiting in tx_wait_q list) in txq list.
193 * 2. changes internal state to HCILL_AWAKE.
194 * Note: assumes that hcill_lock spinlock is taken,
195 * shouldn't be called otherwise!
196 */
197static void __ll_do_awake(struct ll_struct *ll)
198{
199 struct sk_buff *skb = NULL;
200
201 while ((skb = skb_dequeue(&ll->tx_wait_q)))
202 skb_queue_tail(&ll->txq, skb);
203
204 ll->hcill_state = HCILL_AWAKE;
205}
206
207/*
208 * Called upon a wake-up-indication from the device
209 */
210static void ll_device_want_to_wakeup(struct hci_uart *hu)
211{
212 unsigned long flags;
213 struct ll_struct *ll = hu->priv;
214
215 BT_DBG("hu %p", hu);
216
217 /* lock hcill state */
218 spin_lock_irqsave(&ll->hcill_lock, flags);
219
220 switch (ll->hcill_state) {
221 case HCILL_ASLEEP_TO_AWAKE:
222 /*
223 * This state means that both the host and the BRF chip
224 * have simultaneously sent a wake-up-indication packet.
225 * Traditionally, in this case, receiving a wake-up-indication
226 * was enough and an additional wake-up-ack wasn't needed.
227 * This has changed with the BRF6350, which does require an
228 * explicit wake-up-ack. Other BRF versions, which do not
229 * require an explicit ack here, do accept it, thus it is
230 * perfectly safe to always send one.
231 */
232 BT_DBG("dual wake-up-indication");
233 /* fall through */
234 case HCILL_ASLEEP:
235 /* acknowledge device wake up */
236 if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
237 BT_ERR("cannot acknowledge device wake up");
238 goto out;
239 }
240 break;
241 default:
242 /* any other state is illegal */
243 BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
244 break;
245 }
246
247 /* send pending packets and change state to HCILL_AWAKE */
248 __ll_do_awake(ll);
249
250out:
251 spin_unlock_irqrestore(&ll->hcill_lock, flags);
252
253 /* actually send the packets */
254 hci_uart_tx_wakeup(hu);
255}
256
257/*
258 * Called upon a sleep-indication from the device
259 */
260static void ll_device_want_to_sleep(struct hci_uart *hu)
261{
262 unsigned long flags;
263 struct ll_struct *ll = hu->priv;
264
265 BT_DBG("hu %p", hu);
266
267 /* lock hcill state */
268 spin_lock_irqsave(&ll->hcill_lock, flags);
269
270 /* sanity check */
271 if (ll->hcill_state != HCILL_AWAKE)
272 BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);
273
274 /* acknowledge device sleep */
275 if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
276 BT_ERR("cannot acknowledge device sleep");
277 goto out;
278 }
279
280 /* update state */
281 ll->hcill_state = HCILL_ASLEEP;
282
283out:
284 spin_unlock_irqrestore(&ll->hcill_lock, flags);
285
286 /* actually send the sleep ack packet */
287 hci_uart_tx_wakeup(hu);
288}
289
290/*
291 * Called upon wake-up-acknowledgement from the device
292 */
293static void ll_device_woke_up(struct hci_uart *hu)
294{
295 unsigned long flags;
296 struct ll_struct *ll = hu->priv;
297
298 BT_DBG("hu %p", hu);
299
300 /* lock hcill state */
301 spin_lock_irqsave(&ll->hcill_lock, flags);
302
303 /* sanity check */
304 if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
305 BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);
306
307 /* send pending packets and change state to HCILL_AWAKE */
308 __ll_do_awake(ll);
309
310 spin_unlock_irqrestore(&ll->hcill_lock, flags);
311
312 /* actually send the packets */
313 hci_uart_tx_wakeup(hu);
314}
315
316/* Enqueue frame for transmittion (padding, crc, etc) */
317/* may be called from two simultaneous tasklets */
318static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
319{
320 unsigned long flags = 0;
321 struct ll_struct *ll = hu->priv;
322
323 BT_DBG("hu %p skb %p", hu, skb);
324
325 /* Prepend skb with frame type */
326 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
327
328 /* lock hcill state */
329 spin_lock_irqsave(&ll->hcill_lock, flags);
330
331 /* act according to current state */
332 switch (ll->hcill_state) {
333 case HCILL_AWAKE:
334 BT_DBG("device awake, sending normally");
335 skb_queue_tail(&ll->txq, skb);
336 break;
337 case HCILL_ASLEEP:
338 BT_DBG("device asleep, waking up and queueing packet");
339 /* save packet for later */
340 skb_queue_tail(&ll->tx_wait_q, skb);
341 /* awake device */
342 if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
343 BT_ERR("cannot wake up device");
344 break;
345 }
346 ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
347 break;
348 case HCILL_ASLEEP_TO_AWAKE:
349 BT_DBG("device waking up, queueing packet");
350 /* transient state; just keep packet for later */
351 skb_queue_tail(&ll->tx_wait_q, skb);
352 break;
353 default:
354 BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
355 kfree_skb(skb);
356 break;
357 }
358
359 spin_unlock_irqrestore(&ll->hcill_lock, flags);
360
361 return 0;
362}
363
364static int ll_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
365{
366 struct hci_uart *hu = hci_get_drvdata(hdev);
367 struct ll_struct *ll = hu->priv;
368
369 switch (hci_skb_pkt_type(skb)) {
370 case HCILL_GO_TO_SLEEP_IND:
371 BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
372 ll_device_want_to_sleep(hu);
373 break;
374 case HCILL_GO_TO_SLEEP_ACK:
375 /* shouldn't happen */
376 bt_dev_err(hdev, "received HCILL_GO_TO_SLEEP_ACK in state %ld",
377 ll->hcill_state);
378 break;
379 case HCILL_WAKE_UP_IND:
380 BT_DBG("HCILL_WAKE_UP_IND packet");
381 ll_device_want_to_wakeup(hu);
382 break;
383 case HCILL_WAKE_UP_ACK:
384 BT_DBG("HCILL_WAKE_UP_ACK packet");
385 ll_device_woke_up(hu);
386 break;
387 }
388
389 kfree_skb(skb);
390 return 0;
391}
392
393#define LL_RECV_SLEEP_IND \
394 .type = HCILL_GO_TO_SLEEP_IND, \
395 .hlen = 0, \
396 .loff = 0, \
397 .lsize = 0, \
398 .maxlen = 0
399
400#define LL_RECV_SLEEP_ACK \
401 .type = HCILL_GO_TO_SLEEP_ACK, \
402 .hlen = 0, \
403 .loff = 0, \
404 .lsize = 0, \
405 .maxlen = 0
406
407#define LL_RECV_WAKE_IND \
408 .type = HCILL_WAKE_UP_IND, \
409 .hlen = 0, \
410 .loff = 0, \
411 .lsize = 0, \
412 .maxlen = 0
413
414#define LL_RECV_WAKE_ACK \
415 .type = HCILL_WAKE_UP_ACK, \
416 .hlen = 0, \
417 .loff = 0, \
418 .lsize = 0, \
419 .maxlen = 0
420
421static const struct h4_recv_pkt ll_recv_pkts[] = {
422 { H4_RECV_ACL, .recv = hci_recv_frame },
423 { H4_RECV_SCO, .recv = hci_recv_frame },
424 { H4_RECV_EVENT, .recv = hci_recv_frame },
425 { LL_RECV_SLEEP_IND, .recv = ll_recv_frame },
426 { LL_RECV_SLEEP_ACK, .recv = ll_recv_frame },
427 { LL_RECV_WAKE_IND, .recv = ll_recv_frame },
428 { LL_RECV_WAKE_ACK, .recv = ll_recv_frame },
429};
430
431/* Recv data */
432static int ll_recv(struct hci_uart *hu, const void *data, int count)
433{
434 struct ll_struct *ll = hu->priv;
435
436 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
437 return -EUNATCH;
438
439 ll->rx_skb = h4_recv_buf(hu->hdev, ll->rx_skb, data, count,
440 ll_recv_pkts, ARRAY_SIZE(ll_recv_pkts));
441 if (IS_ERR(ll->rx_skb)) {
442 int err = PTR_ERR(ll->rx_skb);
443 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
444 ll->rx_skb = NULL;
445 return err;
446 }
447
448 return count;
449}
450
451static struct sk_buff *ll_dequeue(struct hci_uart *hu)
452{
453 struct ll_struct *ll = hu->priv;
454 return skb_dequeue(&ll->txq);
455}
456
457#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
458static int read_local_version(struct hci_dev *hdev)
459{
460 int err = 0;
461 unsigned short version = 0;
462 struct sk_buff *skb;
463 struct hci_rp_read_local_version *ver;
464
465 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT);
466 if (IS_ERR(skb)) {
467 bt_dev_err(hdev, "Reading TI version information failed (%ld)",
468 PTR_ERR(skb));
469 return PTR_ERR(skb);
470 }
471 if (skb->len != sizeof(*ver)) {
472 err = -EILSEQ;
473 goto out;
474 }
475
476 ver = (struct hci_rp_read_local_version *)skb->data;
477 if (le16_to_cpu(ver->manufacturer) != 13) {
478 err = -ENODEV;
479 goto out;
480 }
481
482 version = le16_to_cpu(ver->lmp_subver);
483
484out:
485 if (err) bt_dev_err(hdev, "Failed to read TI version info: %d", err);
486 kfree_skb(skb);
487 return err ? err : version;
488}
489
490/**
491 * download_firmware -
492 * internal function which parses through the .bts firmware
493 * script file intreprets SEND, DELAY actions only as of now
494 */
495static int download_firmware(struct ll_device *lldev)
496{
497 unsigned short chip, min_ver, maj_ver;
498 int version, err, len;
499 unsigned char *ptr, *action_ptr;
500 unsigned char bts_scr_name[40]; /* 40 char long bts scr name? */
501 const struct firmware *fw;
502 struct sk_buff *skb;
503 struct hci_command *cmd;
504
505 version = read_local_version(lldev->hu.hdev);
506 if (version < 0)
507 return version;
508
509 chip = (version & 0x7C00) >> 10;
510 min_ver = (version & 0x007F);
511 maj_ver = (version & 0x0380) >> 7;
512 if (version & 0x8000)
513 maj_ver |= 0x0008;
514
515 snprintf(bts_scr_name, sizeof(bts_scr_name),
516 "ti-connectivity/TIInit_%d.%d.%d.bts",
517 chip, maj_ver, min_ver);
518
519 err = request_firmware(&fw, bts_scr_name, &lldev->serdev->dev);
520 if (err || !fw->data || !fw->size) {
521 bt_dev_err(lldev->hu.hdev, "request_firmware failed(errno %d) for %s",
522 err, bts_scr_name);
523 return -EINVAL;
524 }
525 ptr = (void *)fw->data;
526 len = fw->size;
527 /* bts_header to remove out magic number and
528 * version
529 */
530 ptr += sizeof(struct bts_header);
531 len -= sizeof(struct bts_header);
532
533 while (len > 0 && ptr) {
534 bt_dev_dbg(lldev->hu.hdev, " action size %d, type %d ",
535 ((struct bts_action *)ptr)->size,
536 ((struct bts_action *)ptr)->type);
537
538 action_ptr = &(((struct bts_action *)ptr)->data[0]);
539
540 switch (((struct bts_action *)ptr)->type) {
541 case ACTION_SEND_COMMAND: /* action send */
542 bt_dev_dbg(lldev->hu.hdev, "S");
543 cmd = (struct hci_command *)action_ptr;
544 if (cmd->opcode == HCI_VS_UPDATE_UART_HCI_BAUDRATE) {
545 /* ignore remote change
546 * baud rate HCI VS command
547 */
548 bt_dev_warn(lldev->hu.hdev, "change remote baud rate command in firmware");
549 break;
550 }
551 if (cmd->prefix != 1)
552 bt_dev_dbg(lldev->hu.hdev, "command type %d", cmd->prefix);
553
554 skb = __hci_cmd_sync(lldev->hu.hdev, cmd->opcode, cmd->plen, &cmd->speed, HCI_INIT_TIMEOUT);
555 if (IS_ERR(skb)) {
556 bt_dev_err(lldev->hu.hdev, "send command failed");
557 err = PTR_ERR(skb);
558 goto out_rel_fw;
559 }
560 kfree_skb(skb);
561 break;
562 case ACTION_WAIT_EVENT: /* wait */
563 /* no need to wait as command was synchronous */
564 bt_dev_dbg(lldev->hu.hdev, "W");
565 break;
566 case ACTION_DELAY: /* sleep */
567 bt_dev_info(lldev->hu.hdev, "sleep command in scr");
568 msleep(((struct bts_action_delay *)action_ptr)->msec);
569 break;
570 }
571 len -= (sizeof(struct bts_action) +
572 ((struct bts_action *)ptr)->size);
573 ptr += sizeof(struct bts_action) +
574 ((struct bts_action *)ptr)->size;
575 }
576
577out_rel_fw:
578 /* fw download complete */
579 release_firmware(fw);
580 return err;
581}
582
583static int ll_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
584{
585 bdaddr_t bdaddr_swapped;
586 struct sk_buff *skb;
587
588 /* HCI_VS_WRITE_BD_ADDR (at least on a CC2560A chip) expects the BD
589 * address to be MSB first, but bdaddr_t has the convention of being
590 * LSB first.
591 */
592 baswap(&bdaddr_swapped, bdaddr);
593 skb = __hci_cmd_sync(hdev, HCI_VS_WRITE_BD_ADDR, sizeof(bdaddr_t),
594 &bdaddr_swapped, HCI_INIT_TIMEOUT);
595 if (!IS_ERR(skb))
596 kfree_skb(skb);
597
598 return PTR_ERR_OR_ZERO(skb);
599}
600
601static int ll_setup(struct hci_uart *hu)
602{
603 int err, retry = 3;
604 struct ll_device *lldev;
605 struct serdev_device *serdev = hu->serdev;
606 u32 speed;
607
608 if (!serdev)
609 return 0;
610
611 lldev = serdev_device_get_drvdata(serdev);
612
613 hu->hdev->set_bdaddr = ll_set_bdaddr;
614
615 serdev_device_set_flow_control(serdev, true);
616
617 do {
618 /* Reset the Bluetooth device */
619 gpiod_set_value_cansleep(lldev->enable_gpio, 0);
620 msleep(5);
621 gpiod_set_value_cansleep(lldev->enable_gpio, 1);
622 err = serdev_device_wait_for_cts(serdev, true, 200);
623 if (err) {
624 bt_dev_err(hu->hdev, "Failed to get CTS");
625 return err;
626 }
627
628 err = download_firmware(lldev);
629 if (!err)
630 break;
631
632 /* Toggle BT_EN and retry */
633 bt_dev_err(hu->hdev, "download firmware failed, retrying...");
634 } while (retry--);
635
636 if (err)
637 return err;
638
639 /* Set BD address if one was specified at probe */
640 if (!bacmp(&lldev->bdaddr, BDADDR_NONE)) {
641 /* This means that there was an error getting the BD address
642 * during probe, so mark the device as having a bad address.
643 */
644 set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
645 } else if (bacmp(&lldev->bdaddr, BDADDR_ANY)) {
646 err = ll_set_bdaddr(hu->hdev, &lldev->bdaddr);
647 if (err)
648 set_bit(HCI_QUIRK_INVALID_BDADDR, &hu->hdev->quirks);
649 }
650
651 /* Operational speed if any */
652 if (hu->oper_speed)
653 speed = hu->oper_speed;
654 else if (hu->proto->oper_speed)
655 speed = hu->proto->oper_speed;
656 else
657 speed = 0;
658
659 if (speed) {
660 __le32 speed_le = cpu_to_le32(speed);
661 struct sk_buff *skb;
662
663 skb = __hci_cmd_sync(hu->hdev, HCI_VS_UPDATE_UART_HCI_BAUDRATE,
664 sizeof(speed_le), &speed_le,
665 HCI_INIT_TIMEOUT);
666 if (!IS_ERR(skb)) {
667 kfree_skb(skb);
668 serdev_device_set_baudrate(serdev, speed);
669 }
670 }
671
672 return 0;
673}
674
675static const struct hci_uart_proto llp;
676
677static int hci_ti_probe(struct serdev_device *serdev)
678{
679 struct hci_uart *hu;
680 struct ll_device *lldev;
681 struct nvmem_cell *bdaddr_cell;
682 u32 max_speed = 3000000;
683
684 lldev = devm_kzalloc(&serdev->dev, sizeof(struct ll_device), GFP_KERNEL);
685 if (!lldev)
686 return -ENOMEM;
687 hu = &lldev->hu;
688
689 serdev_device_set_drvdata(serdev, lldev);
690 lldev->serdev = hu->serdev = serdev;
691
692 lldev->enable_gpio = devm_gpiod_get_optional(&serdev->dev, "enable", GPIOD_OUT_LOW);
693 if (IS_ERR(lldev->enable_gpio))
694 return PTR_ERR(lldev->enable_gpio);
695
696 lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
697 if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
698 return PTR_ERR(lldev->ext_clk);
699
700 of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
701 hci_uart_set_speeds(hu, 115200, max_speed);
702
703 /* optional BD address from nvram */
704 bdaddr_cell = nvmem_cell_get(&serdev->dev, "bd-address");
705 if (IS_ERR(bdaddr_cell)) {
706 int err = PTR_ERR(bdaddr_cell);
707
708 if (err == -EPROBE_DEFER)
709 return err;
710
711 /* ENOENT means there is no matching nvmem cell and ENOSYS
712 * means that nvmem is not enabled in the kernel configuration.
713 */
714 if (err != -ENOENT && err != -ENOSYS) {
715 /* If there was some other error, give userspace a
716 * chance to fix the problem instead of failing to load
717 * the driver. Using BDADDR_NONE as a flag that is
718 * tested later in the setup function.
719 */
720 dev_warn(&serdev->dev,
721 "Failed to get \"bd-address\" nvmem cell (%d)\n",
722 err);
723 bacpy(&lldev->bdaddr, BDADDR_NONE);
724 }
725 } else {
726 bdaddr_t *bdaddr;
727 size_t len;
728
729 bdaddr = nvmem_cell_read(bdaddr_cell, &len);
730 nvmem_cell_put(bdaddr_cell);
731 if (IS_ERR(bdaddr)) {
732 dev_err(&serdev->dev, "Failed to read nvmem bd-address\n");
733 return PTR_ERR(bdaddr);
734 }
735 if (len != sizeof(bdaddr_t)) {
736 dev_err(&serdev->dev, "Invalid nvmem bd-address length\n");
737 kfree(bdaddr);
738 return -EINVAL;
739 }
740
741 /* As per the device tree bindings, the value from nvmem is
742 * expected to be MSB first, but in the kernel it is expected
743 * that bdaddr_t is LSB first.
744 */
745 baswap(&lldev->bdaddr, bdaddr);
746 kfree(bdaddr);
747 }
748
749 return hci_uart_register_device(hu, &llp);
750}
751
752static void hci_ti_remove(struct serdev_device *serdev)
753{
754 struct ll_device *lldev = serdev_device_get_drvdata(serdev);
755
756 hci_uart_unregister_device(&lldev->hu);
757}
758
759static const struct of_device_id hci_ti_of_match[] = {
760 { .compatible = "ti,cc2560" },
761 { .compatible = "ti,wl1271-st" },
762 { .compatible = "ti,wl1273-st" },
763 { .compatible = "ti,wl1281-st" },
764 { .compatible = "ti,wl1283-st" },
765 { .compatible = "ti,wl1285-st" },
766 { .compatible = "ti,wl1801-st" },
767 { .compatible = "ti,wl1805-st" },
768 { .compatible = "ti,wl1807-st" },
769 { .compatible = "ti,wl1831-st" },
770 { .compatible = "ti,wl1835-st" },
771 { .compatible = "ti,wl1837-st" },
772 {},
773};
774MODULE_DEVICE_TABLE(of, hci_ti_of_match);
775
776static struct serdev_device_driver hci_ti_drv = {
777 .driver = {
778 .name = "hci-ti",
779 .of_match_table = of_match_ptr(hci_ti_of_match),
780 },
781 .probe = hci_ti_probe,
782 .remove = hci_ti_remove,
783};
784#else
785#define ll_setup NULL
786#endif
787
788static const struct hci_uart_proto llp = {
789 .id = HCI_UART_LL,
790 .name = "LL",
791 .setup = ll_setup,
792 .open = ll_open,
793 .close = ll_close,
794 .recv = ll_recv,
795 .enqueue = ll_enqueue,
796 .dequeue = ll_dequeue,
797 .flush = ll_flush,
798};
799
800int __init ll_init(void)
801{
802 serdev_device_driver_register(&hci_ti_drv);
803
804 return hci_uart_register_proto(&llp);
805}
806
807int __exit ll_deinit(void)
808{
809 serdev_device_driver_unregister(&hci_ti_drv);
810
811 return hci_uart_unregister_proto(&llp);
812}
813