1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Bluetooth HCI UART H4 driver with Nokia Extensions AKA Nokia H4+
4 *
5 * Copyright (C) 2015 Marcel Holtmann <marcel@holtmann.org>
6 * Copyright (C) 2015-2017 Sebastian Reichel <sre@kernel.org>
7 */
8
9#include <linux/clk.h>
10#include <linux/errno.h>
11#include <linux/firmware.h>
12#include <linux/gpio/consumer.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/pm_runtime.h>
18#include <linux/serdev.h>
19#include <linux/skbuff.h>
20#include <linux/slab.h>
21#include <linux/string.h>
22#include <linux/types.h>
23#include <linux/unaligned.h>
24#include <net/bluetooth/bluetooth.h>
25#include <net/bluetooth/hci_core.h>
26
27#include "hci_uart.h"
28#include "btbcm.h"
29
30#define VERSION "0.1"
31
32#define NOKIA_ID_BCM2048 0x04
33#define NOKIA_ID_TI1271 0x31
34
35#define FIRMWARE_BCM2048 "nokia/bcmfw.bin"
36#define FIRMWARE_TI1271 "nokia/ti1273.bin"
37
38#define HCI_NOKIA_NEG_PKT 0x06
39#define HCI_NOKIA_ALIVE_PKT 0x07
40#define HCI_NOKIA_RADIO_PKT 0x08
41
42#define HCI_NOKIA_NEG_HDR_SIZE 1
43#define HCI_NOKIA_MAX_NEG_SIZE 255
44#define HCI_NOKIA_ALIVE_HDR_SIZE 1
45#define HCI_NOKIA_MAX_ALIVE_SIZE 255
46#define HCI_NOKIA_RADIO_HDR_SIZE 2
47#define HCI_NOKIA_MAX_RADIO_SIZE 255
48
49#define NOKIA_PROTO_PKT 0x44
50#define NOKIA_PROTO_BYTE 0x4c
51
52#define NOKIA_NEG_REQ 0x00
53#define NOKIA_NEG_ACK 0x20
54#define NOKIA_NEG_NAK 0x40
55
56#define H4_TYPE_SIZE 1
57
58#define NOKIA_RECV_ALIVE \
59 .type = HCI_NOKIA_ALIVE_PKT, \
60 .hlen = HCI_NOKIA_ALIVE_HDR_SIZE, \
61 .loff = 0, \
62 .lsize = 1, \
63 .maxlen = HCI_NOKIA_MAX_ALIVE_SIZE \
64
65#define NOKIA_RECV_NEG \
66 .type = HCI_NOKIA_NEG_PKT, \
67 .hlen = HCI_NOKIA_NEG_HDR_SIZE, \
68 .loff = 0, \
69 .lsize = 1, \
70 .maxlen = HCI_NOKIA_MAX_NEG_SIZE \
71
72#define NOKIA_RECV_RADIO \
73 .type = HCI_NOKIA_RADIO_PKT, \
74 .hlen = HCI_NOKIA_RADIO_HDR_SIZE, \
75 .loff = 1, \
76 .lsize = 1, \
77 .maxlen = HCI_NOKIA_MAX_RADIO_SIZE \
78
79struct hci_nokia_neg_hdr {
80 u8 dlen;
81} __packed;
82
83struct hci_nokia_neg_cmd {
84 u8 ack;
85 u16 baud;
86 u16 unused1;
87 u8 proto;
88 u16 sys_clk;
89 u16 unused2;
90} __packed;
91
92#define NOKIA_ALIVE_REQ 0x55
93#define NOKIA_ALIVE_RESP 0xcc
94
95struct hci_nokia_alive_hdr {
96 u8 dlen;
97} __packed;
98
99struct hci_nokia_alive_pkt {
100 u8 mid;
101 u8 unused;
102} __packed;
103
104struct hci_nokia_neg_evt {
105 u8 ack;
106 u16 baud;
107 u16 unused1;
108 u8 proto;
109 u16 sys_clk;
110 u16 unused2;
111 u8 man_id;
112 u8 ver_id;
113} __packed;
114
115#define MAX_BAUD_RATE 3692300
116#define SETUP_BAUD_RATE 921600
117#define INIT_BAUD_RATE 120000
118
119struct nokia_bt_dev {
120 struct hci_uart hu;
121 struct serdev_device *serdev;
122
123 struct gpio_desc *reset;
124 struct gpio_desc *wakeup_host;
125 struct gpio_desc *wakeup_bt;
126 unsigned long sysclk_speed;
127
128 int wake_irq;
129 struct sk_buff *rx_skb;
130 struct sk_buff_head txq;
131 bdaddr_t bdaddr;
132
133 int init_error;
134 struct completion init_completion;
135
136 u8 man_id;
137 u8 ver_id;
138
139 bool initialized;
140 bool tx_enabled;
141 bool rx_enabled;
142};
143
144static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb);
145
146static void nokia_flow_control(struct serdev_device *serdev, bool enable)
147{
148 if (enable) {
149 serdev_device_set_rts(serdev, enable: true);
150 serdev_device_set_flow_control(serdev, true);
151 } else {
152 serdev_device_set_flow_control(serdev, false);
153 serdev_device_set_rts(serdev, enable: false);
154 }
155}
156
157static irqreturn_t wakeup_handler(int irq, void *data)
158{
159 struct nokia_bt_dev *btdev = data;
160 struct device *dev = &btdev->serdev->dev;
161 int wake_state = gpiod_get_value(desc: btdev->wakeup_host);
162
163 if (btdev->rx_enabled == wake_state)
164 return IRQ_HANDLED;
165
166 if (wake_state)
167 pm_runtime_get(dev);
168 else
169 pm_runtime_put(dev);
170
171 btdev->rx_enabled = wake_state;
172
173 return IRQ_HANDLED;
174}
175
176static int nokia_reset(struct hci_uart *hu)
177{
178 struct nokia_bt_dev *btdev = hu->priv;
179 struct device *dev = &btdev->serdev->dev;
180 int err;
181
182 /* reset routine */
183 gpiod_set_value_cansleep(desc: btdev->reset, value: 1);
184 gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 1);
185
186 msleep(msecs: 100);
187
188 /* safety check */
189 err = gpiod_get_value_cansleep(desc: btdev->wakeup_host);
190 if (err == 1) {
191 dev_err(dev, "reset: host wakeup not low!");
192 return -EPROTO;
193 }
194
195 /* flush queue */
196 serdev_device_write_flush(btdev->serdev);
197
198 /* init uart */
199 nokia_flow_control(serdev: btdev->serdev, enable: false);
200 serdev_device_set_baudrate(btdev->serdev, INIT_BAUD_RATE);
201
202 gpiod_set_value_cansleep(desc: btdev->reset, value: 0);
203
204 /* wait for cts */
205 err = serdev_device_wait_for_cts(serdev: btdev->serdev, state: true, timeout_ms: 200);
206 if (err < 0) {
207 dev_err(dev, "CTS not received: %d", err);
208 return err;
209 }
210
211 nokia_flow_control(serdev: btdev->serdev, enable: true);
212
213 return 0;
214}
215
216static int nokia_send_alive_packet(struct hci_uart *hu)
217{
218 struct nokia_bt_dev *btdev = hu->priv;
219 struct device *dev = &btdev->serdev->dev;
220 struct hci_nokia_alive_hdr *hdr;
221 struct hci_nokia_alive_pkt *pkt;
222 struct sk_buff *skb;
223 int len;
224
225 init_completion(x: &btdev->init_completion);
226
227 len = H4_TYPE_SIZE + sizeof(*hdr) + sizeof(*pkt);
228 skb = bt_skb_alloc(len, GFP_KERNEL);
229 if (!skb)
230 return -ENOMEM;
231
232 hci_skb_pkt_type(skb) = HCI_NOKIA_ALIVE_PKT;
233 memset(skb->data, 0x00, len);
234
235 hdr = skb_put(skb, len: sizeof(*hdr));
236 hdr->dlen = sizeof(*pkt);
237 pkt = skb_put(skb, len: sizeof(*pkt));
238 pkt->mid = NOKIA_ALIVE_REQ;
239
240 nokia_enqueue(hu, skb);
241 hci_uart_tx_wakeup(hu);
242
243 dev_dbg(dev, "Alive sent");
244
245 if (!wait_for_completion_interruptible_timeout(x: &btdev->init_completion,
246 timeout: msecs_to_jiffies(m: 1000))) {
247 return -ETIMEDOUT;
248 }
249
250 if (btdev->init_error < 0)
251 return btdev->init_error;
252
253 return 0;
254}
255
256static int nokia_send_negotiation(struct hci_uart *hu)
257{
258 struct nokia_bt_dev *btdev = hu->priv;
259 struct device *dev = &btdev->serdev->dev;
260 struct hci_nokia_neg_cmd *neg_cmd;
261 struct hci_nokia_neg_hdr *neg_hdr;
262 struct sk_buff *skb;
263 int len, err;
264 u16 baud = DIV_ROUND_CLOSEST(btdev->sysclk_speed * 10, SETUP_BAUD_RATE);
265 int sysclk = btdev->sysclk_speed / 1000;
266
267 len = H4_TYPE_SIZE + sizeof(*neg_hdr) + sizeof(*neg_cmd);
268 skb = bt_skb_alloc(len, GFP_KERNEL);
269 if (!skb)
270 return -ENOMEM;
271
272 hci_skb_pkt_type(skb) = HCI_NOKIA_NEG_PKT;
273
274 neg_hdr = skb_put(skb, len: sizeof(*neg_hdr));
275 neg_hdr->dlen = sizeof(*neg_cmd);
276
277 neg_cmd = skb_put(skb, len: sizeof(*neg_cmd));
278 neg_cmd->ack = NOKIA_NEG_REQ;
279 neg_cmd->baud = cpu_to_le16(baud);
280 neg_cmd->unused1 = 0x0000;
281 neg_cmd->proto = NOKIA_PROTO_BYTE;
282 neg_cmd->sys_clk = cpu_to_le16(sysclk);
283 neg_cmd->unused2 = 0x0000;
284
285 btdev->init_error = 0;
286 init_completion(x: &btdev->init_completion);
287
288 nokia_enqueue(hu, skb);
289 hci_uart_tx_wakeup(hu);
290
291 dev_dbg(dev, "Negotiation sent");
292
293 if (!wait_for_completion_interruptible_timeout(x: &btdev->init_completion,
294 timeout: msecs_to_jiffies(m: 10000))) {
295 return -ETIMEDOUT;
296 }
297
298 if (btdev->init_error < 0)
299 return btdev->init_error;
300
301 /* Change to previously negotiated speed. Flow Control
302 * is disabled until bluetooth adapter is ready to avoid
303 * broken bytes being received.
304 */
305 nokia_flow_control(serdev: btdev->serdev, enable: false);
306 serdev_device_set_baudrate(btdev->serdev, SETUP_BAUD_RATE);
307 err = serdev_device_wait_for_cts(serdev: btdev->serdev, state: true, timeout_ms: 200);
308 if (err < 0) {
309 dev_err(dev, "CTS not received: %d", err);
310 return err;
311 }
312 nokia_flow_control(serdev: btdev->serdev, enable: true);
313
314 dev_dbg(dev, "Negotiation successful");
315
316 return 0;
317}
318
319static int nokia_setup_fw(struct hci_uart *hu)
320{
321 struct nokia_bt_dev *btdev = hu->priv;
322 struct device *dev = &btdev->serdev->dev;
323 const char *fwname;
324 const struct firmware *fw;
325 const u8 *fw_ptr;
326 size_t fw_size;
327 int err;
328
329 dev_dbg(dev, "setup firmware");
330
331 if (btdev->man_id == NOKIA_ID_BCM2048) {
332 fwname = FIRMWARE_BCM2048;
333 } else if (btdev->man_id == NOKIA_ID_TI1271) {
334 fwname = FIRMWARE_TI1271;
335 } else {
336 dev_err(dev, "Unsupported bluetooth device!");
337 return -ENODEV;
338 }
339
340 err = request_firmware(fw: &fw, name: fwname, device: dev);
341 if (err < 0) {
342 dev_err(dev, "%s: Failed to load Nokia firmware file (%d)",
343 hu->hdev->name, err);
344 return err;
345 }
346
347 fw_ptr = fw->data;
348 fw_size = fw->size;
349
350 while (fw_size >= 4) {
351 u16 pkt_size = get_unaligned_le16(p: fw_ptr);
352 u8 pkt_type = fw_ptr[2];
353 const struct hci_command_hdr *cmd;
354 u16 opcode;
355 struct sk_buff *skb;
356
357 switch (pkt_type) {
358 case HCI_COMMAND_PKT:
359 cmd = (struct hci_command_hdr *)(fw_ptr + 3);
360 opcode = le16_to_cpu(cmd->opcode);
361
362 skb = __hci_cmd_sync(hdev: hu->hdev, opcode, plen: cmd->plen,
363 param: fw_ptr + 3 + HCI_COMMAND_HDR_SIZE,
364 HCI_INIT_TIMEOUT);
365 if (IS_ERR(ptr: skb)) {
366 err = PTR_ERR(ptr: skb);
367 dev_err(dev, "%s: FW command %04x failed (%d)",
368 hu->hdev->name, opcode, err);
369 goto done;
370 }
371 kfree_skb(skb);
372 break;
373 case HCI_NOKIA_RADIO_PKT:
374 case HCI_NOKIA_NEG_PKT:
375 case HCI_NOKIA_ALIVE_PKT:
376 break;
377 }
378
379 fw_ptr += pkt_size + 2;
380 fw_size -= pkt_size + 2;
381 }
382
383done:
384 release_firmware(fw);
385 return err;
386}
387
388static int nokia_setup(struct hci_uart *hu)
389{
390 struct nokia_bt_dev *btdev = hu->priv;
391 struct device *dev = &btdev->serdev->dev;
392 int err;
393
394 btdev->initialized = false;
395
396 nokia_flow_control(serdev: btdev->serdev, enable: false);
397
398 pm_runtime_get_sync(dev);
399
400 if (btdev->tx_enabled) {
401 gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 0);
402 pm_runtime_put(dev: &btdev->serdev->dev);
403 btdev->tx_enabled = false;
404 }
405
406 dev_dbg(dev, "protocol setup");
407
408 /* 0. reset connection */
409 err = nokia_reset(hu);
410 if (err < 0) {
411 dev_err(dev, "Reset failed: %d", err);
412 goto out;
413 }
414
415 /* 1. negotiate speed etc */
416 err = nokia_send_negotiation(hu);
417 if (err < 0) {
418 dev_err(dev, "Negotiation failed: %d", err);
419 goto out;
420 }
421
422 /* 2. verify correct setup using alive packet */
423 err = nokia_send_alive_packet(hu);
424 if (err < 0) {
425 dev_err(dev, "Alive check failed: %d", err);
426 goto out;
427 }
428
429 /* 3. send firmware */
430 err = nokia_setup_fw(hu);
431 if (err < 0) {
432 dev_err(dev, "Could not setup FW: %d", err);
433 goto out;
434 }
435
436 nokia_flow_control(serdev: btdev->serdev, enable: false);
437 serdev_device_set_baudrate(btdev->serdev, MAX_BAUD_RATE);
438 nokia_flow_control(serdev: btdev->serdev, enable: true);
439
440 if (btdev->man_id == NOKIA_ID_BCM2048) {
441 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
442 hci_set_quirk(hu->hdev, HCI_QUIRK_INVALID_BDADDR);
443 dev_dbg(dev, "bcm2048 has invalid bluetooth address!");
444 }
445
446 dev_dbg(dev, "protocol setup done!");
447
448 gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 0);
449 pm_runtime_put(dev);
450 btdev->tx_enabled = false;
451 btdev->initialized = true;
452
453 return 0;
454out:
455 pm_runtime_put(dev);
456
457 return err;
458}
459
460static int nokia_open(struct hci_uart *hu)
461{
462 struct device *dev = &hu->serdev->dev;
463
464 dev_dbg(dev, "protocol open");
465
466 pm_runtime_enable(dev);
467
468 return 0;
469}
470
471static int nokia_flush(struct hci_uart *hu)
472{
473 struct nokia_bt_dev *btdev = hu->priv;
474
475 dev_dbg(&btdev->serdev->dev, "flush device");
476
477 skb_queue_purge(list: &btdev->txq);
478
479 return 0;
480}
481
482static int nokia_close(struct hci_uart *hu)
483{
484 struct nokia_bt_dev *btdev = hu->priv;
485 struct device *dev = &btdev->serdev->dev;
486
487 dev_dbg(dev, "close device");
488
489 btdev->initialized = false;
490
491 skb_queue_purge(list: &btdev->txq);
492
493 kfree_skb(skb: btdev->rx_skb);
494
495 /* disable module */
496 gpiod_set_value(desc: btdev->reset, value: 1);
497 gpiod_set_value(desc: btdev->wakeup_bt, value: 0);
498
499 pm_runtime_disable(dev: &btdev->serdev->dev);
500
501 return 0;
502}
503
504/* Enqueue frame for transmission (padding, crc, etc) */
505static int nokia_enqueue(struct hci_uart *hu, struct sk_buff *skb)
506{
507 struct nokia_bt_dev *btdev = hu->priv;
508 int err;
509
510 /* Prepend skb with frame type */
511 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
512
513 /* Packets must be word aligned */
514 if (skb->len % 2) {
515 err = skb_pad(skb, pad: 1);
516 if (err)
517 return err;
518 skb_put(skb, len: 1);
519 }
520
521 skb_queue_tail(list: &btdev->txq, newsk: skb);
522
523 return 0;
524}
525
526static int nokia_recv_negotiation_packet(struct hci_dev *hdev,
527 struct sk_buff *skb)
528{
529 struct hci_uart *hu = hci_get_drvdata(hdev);
530 struct nokia_bt_dev *btdev = hu->priv;
531 struct device *dev = &btdev->serdev->dev;
532 struct hci_nokia_neg_hdr *hdr;
533 struct hci_nokia_neg_evt *evt;
534 int ret = 0;
535
536 hdr = (struct hci_nokia_neg_hdr *)skb->data;
537 if (hdr->dlen != sizeof(*evt)) {
538 btdev->init_error = -EIO;
539 ret = -EIO;
540 goto finish_neg;
541 }
542
543 evt = skb_pull(skb, len: sizeof(*hdr));
544
545 if (evt->ack != NOKIA_NEG_ACK) {
546 dev_err(dev, "Negotiation received: wrong reply");
547 btdev->init_error = -EINVAL;
548 ret = -EINVAL;
549 goto finish_neg;
550 }
551
552 btdev->man_id = evt->man_id;
553 btdev->ver_id = evt->ver_id;
554
555 dev_dbg(dev, "Negotiation received: baud=%u:clk=%u:manu=%u:vers=%u",
556 evt->baud, evt->sys_clk, evt->man_id, evt->ver_id);
557
558finish_neg:
559 complete(&btdev->init_completion);
560 kfree_skb(skb);
561 return ret;
562}
563
564static int nokia_recv_alive_packet(struct hci_dev *hdev, struct sk_buff *skb)
565{
566 struct hci_uart *hu = hci_get_drvdata(hdev);
567 struct nokia_bt_dev *btdev = hu->priv;
568 struct device *dev = &btdev->serdev->dev;
569 struct hci_nokia_alive_hdr *hdr;
570 struct hci_nokia_alive_pkt *pkt;
571 int ret = 0;
572
573 hdr = (struct hci_nokia_alive_hdr *)skb->data;
574 if (hdr->dlen != sizeof(*pkt)) {
575 dev_err(dev, "Corrupted alive message");
576 btdev->init_error = -EIO;
577 ret = -EIO;
578 goto finish_alive;
579 }
580
581 pkt = skb_pull(skb, len: sizeof(*hdr));
582
583 if (pkt->mid != NOKIA_ALIVE_RESP) {
584 dev_err(dev, "Alive received: invalid response: 0x%02x!",
585 pkt->mid);
586 btdev->init_error = -EINVAL;
587 ret = -EINVAL;
588 goto finish_alive;
589 }
590
591 dev_dbg(dev, "Alive received");
592
593finish_alive:
594 complete(&btdev->init_completion);
595 kfree_skb(skb);
596 return ret;
597}
598
599static int nokia_recv_radio(struct hci_dev *hdev, struct sk_buff *skb)
600{
601 /* Packets received on the dedicated radio channel are
602 * HCI events and so feed them back into the core.
603 */
604 hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
605 return hci_recv_frame(hdev, skb);
606}
607
608/* Recv data */
609static const struct h4_recv_pkt nokia_recv_pkts[] = {
610 { H4_RECV_ACL, .recv = hci_recv_frame },
611 { H4_RECV_SCO, .recv = hci_recv_frame },
612 { H4_RECV_EVENT, .recv = hci_recv_frame },
613 { NOKIA_RECV_ALIVE, .recv = nokia_recv_alive_packet },
614 { NOKIA_RECV_NEG, .recv = nokia_recv_negotiation_packet },
615 { NOKIA_RECV_RADIO, .recv = nokia_recv_radio },
616};
617
618static int nokia_recv(struct hci_uart *hu, const void *data, int count)
619{
620 struct nokia_bt_dev *btdev = hu->priv;
621 struct device *dev = &btdev->serdev->dev;
622 int err;
623
624 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
625 return -EUNATCH;
626
627 btdev->rx_skb = h4_recv_buf(hu, skb: btdev->rx_skb, buffer: data, count,
628 pkts: nokia_recv_pkts, ARRAY_SIZE(nokia_recv_pkts));
629 if (IS_ERR(ptr: btdev->rx_skb)) {
630 err = PTR_ERR(ptr: btdev->rx_skb);
631 dev_err(dev, "Frame reassembly failed (%d)", err);
632 btdev->rx_skb = NULL;
633 return err;
634 }
635
636 return count;
637}
638
639static struct sk_buff *nokia_dequeue(struct hci_uart *hu)
640{
641 struct nokia_bt_dev *btdev = hu->priv;
642 struct device *dev = &btdev->serdev->dev;
643 struct sk_buff *result = skb_dequeue(list: &btdev->txq);
644
645 if (!btdev->initialized)
646 return result;
647
648 if (btdev->tx_enabled == !!result)
649 return result;
650
651 if (result) {
652 pm_runtime_get_sync(dev);
653 gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 1);
654 } else {
655 serdev_device_wait_until_sent(btdev->serdev, 0);
656 gpiod_set_value_cansleep(desc: btdev->wakeup_bt, value: 0);
657 pm_runtime_put(dev);
658 }
659
660 btdev->tx_enabled = !!result;
661
662 return result;
663}
664
665static const struct hci_uart_proto nokia_proto = {
666 .id = HCI_UART_NOKIA,
667 .name = "Nokia",
668 .open = nokia_open,
669 .close = nokia_close,
670 .recv = nokia_recv,
671 .enqueue = nokia_enqueue,
672 .dequeue = nokia_dequeue,
673 .flush = nokia_flush,
674 .setup = nokia_setup,
675 .manufacturer = 1,
676};
677
678static int nokia_bluetooth_serdev_probe(struct serdev_device *serdev)
679{
680 struct device *dev = &serdev->dev;
681 struct nokia_bt_dev *btdev;
682 struct clk *sysclk;
683 int err = 0;
684
685 btdev = devm_kzalloc(dev, size: sizeof(*btdev), GFP_KERNEL);
686 if (!btdev)
687 return -ENOMEM;
688
689 btdev->hu.serdev = btdev->serdev = serdev;
690 serdev_device_set_drvdata(serdev, data: btdev);
691
692 btdev->reset = devm_gpiod_get(dev, con_id: "reset", flags: GPIOD_OUT_HIGH);
693 if (IS_ERR(ptr: btdev->reset)) {
694 err = PTR_ERR(ptr: btdev->reset);
695 dev_err(dev, "could not get reset gpio: %d", err);
696 return err;
697 }
698
699 btdev->wakeup_host = devm_gpiod_get(dev, con_id: "host-wakeup", flags: GPIOD_IN);
700 if (IS_ERR(ptr: btdev->wakeup_host)) {
701 err = PTR_ERR(ptr: btdev->wakeup_host);
702 dev_err(dev, "could not get host wakeup gpio: %d", err);
703 return err;
704 }
705
706 btdev->wake_irq = gpiod_to_irq(desc: btdev->wakeup_host);
707
708 err = devm_request_threaded_irq(dev, irq: btdev->wake_irq, NULL,
709 thread_fn: wakeup_handler,
710 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
711 devname: "wakeup", dev_id: btdev);
712 if (err) {
713 dev_err(dev, "could request wakeup irq: %d", err);
714 return err;
715 }
716
717 btdev->wakeup_bt = devm_gpiod_get(dev, con_id: "bluetooth-wakeup",
718 flags: GPIOD_OUT_LOW);
719 if (IS_ERR(ptr: btdev->wakeup_bt)) {
720 err = PTR_ERR(ptr: btdev->wakeup_bt);
721 dev_err(dev, "could not get BT wakeup gpio: %d", err);
722 return err;
723 }
724
725 sysclk = devm_clk_get(dev, id: "sysclk");
726 if (IS_ERR(ptr: sysclk)) {
727 err = PTR_ERR(ptr: sysclk);
728 dev_err(dev, "could not get sysclk: %d", err);
729 return err;
730 }
731
732 err = clk_prepare_enable(clk: sysclk);
733 if (err) {
734 dev_err(dev, "could not enable sysclk: %d", err);
735 return err;
736 }
737 btdev->sysclk_speed = clk_get_rate(clk: sysclk);
738 clk_disable_unprepare(clk: sysclk);
739
740 skb_queue_head_init(list: &btdev->txq);
741
742 btdev->hu.priv = btdev;
743 btdev->hu.alignment = 2; /* Nokia H4+ is word aligned */
744
745 err = hci_uart_register_device(hu: &btdev->hu, p: &nokia_proto);
746 if (err) {
747 dev_err(dev, "could not register bluetooth uart: %d", err);
748 return err;
749 }
750
751 return 0;
752}
753
754static void nokia_bluetooth_serdev_remove(struct serdev_device *serdev)
755{
756 struct nokia_bt_dev *btdev = serdev_device_get_drvdata(serdev);
757
758 hci_uart_unregister_device(hu: &btdev->hu);
759}
760
761static int nokia_bluetooth_runtime_suspend(struct device *dev)
762{
763 struct serdev_device *serdev = to_serdev_device(d: dev);
764
765 nokia_flow_control(serdev, enable: false);
766 return 0;
767}
768
769static int nokia_bluetooth_runtime_resume(struct device *dev)
770{
771 struct serdev_device *serdev = to_serdev_device(d: dev);
772
773 nokia_flow_control(serdev, enable: true);
774 return 0;
775}
776
777static const struct dev_pm_ops nokia_bluetooth_pm_ops = {
778 SET_RUNTIME_PM_OPS(nokia_bluetooth_runtime_suspend,
779 nokia_bluetooth_runtime_resume,
780 NULL)
781};
782
783#ifdef CONFIG_OF
784static const struct of_device_id nokia_bluetooth_of_match[] = {
785 { .compatible = "nokia,h4p-bluetooth", },
786 {},
787};
788MODULE_DEVICE_TABLE(of, nokia_bluetooth_of_match);
789#endif
790
791static struct serdev_device_driver nokia_bluetooth_serdev_driver = {
792 .probe = nokia_bluetooth_serdev_probe,
793 .remove = nokia_bluetooth_serdev_remove,
794 .driver = {
795 .name = "nokia-bluetooth",
796 .pm = &nokia_bluetooth_pm_ops,
797 .of_match_table = of_match_ptr(nokia_bluetooth_of_match),
798 },
799};
800
801module_serdev_device_driver(nokia_bluetooth_serdev_driver);
802
803MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
804MODULE_DESCRIPTION("Bluetooth HCI UART Nokia H4+ driver ver " VERSION);
805MODULE_VERSION(VERSION);
806MODULE_LICENSE("GPL");
807

source code of linux/drivers/bluetooth/hci_nokia.c