1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Bluetooth HCI Three-wire UART driver
6 * Copyright (C) 2012 Intel Corporation
9 #include <linux/acpi.h>
10 #include <linux/errno.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/kernel.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/serdev.h>
15 #include <linux/skbuff.h>
17 #include <net/bluetooth/bluetooth.h>
18 #include <net/bluetooth/hci_core.h>
23 #define HCI_3WIRE_ACK_PKT 0
24 #define HCI_3WIRE_LINK_PKT 15
26 /* Sliding window size */
27 #define H5_TX_WIN_MAX 4
29 #define H5_ACK_TIMEOUT msecs_to_jiffies(250)
30 #define H5_SYNC_TIMEOUT msecs_to_jiffies(100)
33 * Maximum Three-wire packet:
34 * 4 byte header + max value for 12-bit length + 2 bytes for CRC
36 #define H5_MAX_LEN (4 + 0xfff + 2)
38 /* Convenience macros for reading Three-wire header values */
39 #define H5_HDR_SEQ(hdr) ((hdr)[0] & 0x07)
40 #define H5_HDR_ACK(hdr) (((hdr)[0] >> 3) & 0x07)
41 #define H5_HDR_CRC(hdr) (((hdr)[0] >> 6) & 0x01)
42 #define H5_HDR_RELIABLE(hdr) (((hdr)[0] >> 7) & 0x01)
43 #define H5_HDR_PKT_TYPE(hdr) ((hdr)[1] & 0x0f)
44 #define H5_HDR_LEN(hdr) ((((hdr)[1] >> 4) & 0x0f) + ((hdr)[2] << 4))
46 #define SLIP_DELIMITER 0xc0
48 #define SLIP_ESC_DELIM 0xdc
49 #define SLIP_ESC_ESC 0xdd
53 H5_RX_ESC, /* SLIP escape mode */
54 H5_TX_ACK_REQ, /* Pending ack to send */
58 /* Must be the first member, hci_serdev.c expects this. */
59 struct hci_uart serdev_hu;
61 struct sk_buff_head unack; /* Unack'ed packets queue */
62 struct sk_buff_head rel; /* Reliable packets queue */
63 struct sk_buff_head unrel; /* Unreliable packets queue */
67 struct sk_buff *rx_skb; /* Receive buffer */
68 size_t rx_pending; /* Expecting more bytes */
69 u8 rx_ack; /* Last ack number received */
71 int (*rx_func)(struct hci_uart *hu, u8 c);
73 struct timer_list timer; /* Retransmission timer */
74 struct hci_uart *hu; /* Parent HCI UART */
76 u8 tx_seq; /* Next seq number to send */
77 u8 tx_ack; /* Next ack number to send */
78 u8 tx_win; /* Sliding window size */
92 const struct h5_vnd *vnd;
95 struct gpio_desc *enable_gpio;
96 struct gpio_desc *device_wake_gpio;
100 int (*setup)(struct h5 *h5);
101 void (*open)(struct h5 *h5);
102 void (*close)(struct h5 *h5);
103 int (*suspend)(struct h5 *h5);
104 int (*resume)(struct h5 *h5);
105 const struct acpi_gpio_mapping *acpi_gpio_map;
108 static void h5_reset_rx(struct h5 *h5);
110 static void h5_link_control(struct hci_uart *hu, const void *data, size_t len)
112 struct h5 *h5 = hu->priv;
113 struct sk_buff *nskb;
115 nskb = alloc_skb(3, GFP_ATOMIC);
119 hci_skb_pkt_type(nskb) = HCI_3WIRE_LINK_PKT;
121 skb_put_data(nskb, data, len);
123 skb_queue_tail(&h5->unrel, nskb);
126 static u8 h5_cfg_field(struct h5 *h5)
128 /* Sliding window size (first 3 bits) */
129 return h5->tx_win & 0x07;
132 static void h5_timed_event(struct timer_list *t)
134 const unsigned char sync_req[] = { 0x01, 0x7e };
135 unsigned char conf_req[3] = { 0x03, 0xfc };
136 struct h5 *h5 = from_timer(h5, t, timer);
137 struct hci_uart *hu = h5->hu;
141 BT_DBG("%s", hu->hdev->name);
143 if (h5->state == H5_UNINITIALIZED)
144 h5_link_control(hu, sync_req, sizeof(sync_req));
146 if (h5->state == H5_INITIALIZED) {
147 conf_req[2] = h5_cfg_field(h5);
148 h5_link_control(hu, conf_req, sizeof(conf_req));
151 if (h5->state != H5_ACTIVE) {
152 mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);
156 if (h5->sleep != H5_AWAKE) {
157 h5->sleep = H5_SLEEPING;
161 BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen);
163 spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
165 while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
166 h5->tx_seq = (h5->tx_seq - 1) & 0x07;
167 skb_queue_head(&h5->rel, skb);
170 spin_unlock_irqrestore(&h5->unack.lock, flags);
173 hci_uart_tx_wakeup(hu);
176 static void h5_peer_reset(struct hci_uart *hu)
178 struct h5 *h5 = hu->priv;
180 BT_ERR("Peer device has reset");
182 h5->state = H5_UNINITIALIZED;
184 del_timer(&h5->timer);
186 skb_queue_purge(&h5->rel);
187 skb_queue_purge(&h5->unrel);
188 skb_queue_purge(&h5->unack);
193 /* Send reset request to upper stack */
194 hci_reset_dev(hu->hdev);
197 static int h5_open(struct hci_uart *hu)
200 const unsigned char sync[] = { 0x01, 0x7e };
205 h5 = serdev_device_get_drvdata(hu->serdev);
207 h5 = kzalloc(sizeof(*h5), GFP_KERNEL);
215 skb_queue_head_init(&h5->unack);
216 skb_queue_head_init(&h5->rel);
217 skb_queue_head_init(&h5->unrel);
221 timer_setup(&h5->timer, h5_timed_event, 0);
223 h5->tx_win = H5_TX_WIN_MAX;
225 if (h5->vnd && h5->vnd->open)
228 set_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags);
230 /* Send initial sync request */
231 h5_link_control(hu, sync, sizeof(sync));
232 mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);
237 static int h5_close(struct hci_uart *hu)
239 struct h5 *h5 = hu->priv;
241 del_timer_sync(&h5->timer);
243 skb_queue_purge(&h5->unack);
244 skb_queue_purge(&h5->rel);
245 skb_queue_purge(&h5->unrel);
247 kfree_skb(h5->rx_skb);
250 if (h5->vnd && h5->vnd->close)
259 static int h5_setup(struct hci_uart *hu)
261 struct h5 *h5 = hu->priv;
263 if (h5->vnd && h5->vnd->setup)
264 return h5->vnd->setup(h5);
269 static void h5_pkt_cull(struct h5 *h5)
271 struct sk_buff *skb, *tmp;
276 spin_lock_irqsave(&h5->unack.lock, flags);
278 to_remove = skb_queue_len(&h5->unack);
284 while (to_remove > 0) {
285 if (h5->rx_ack == seq)
289 seq = (seq - 1) & 0x07;
292 if (seq != h5->rx_ack)
293 BT_ERR("Controller acked invalid packet");
296 skb_queue_walk_safe(&h5->unack, skb, tmp) {
297 if (i++ >= to_remove)
300 __skb_unlink(skb, &h5->unack);
301 dev_kfree_skb_irq(skb);
304 if (skb_queue_empty(&h5->unack))
305 del_timer(&h5->timer);
308 spin_unlock_irqrestore(&h5->unack.lock, flags);
311 static void h5_handle_internal_rx(struct hci_uart *hu)
313 struct h5 *h5 = hu->priv;
314 const unsigned char sync_req[] = { 0x01, 0x7e };
315 const unsigned char sync_rsp[] = { 0x02, 0x7d };
316 unsigned char conf_req[3] = { 0x03, 0xfc };
317 const unsigned char conf_rsp[] = { 0x04, 0x7b };
318 const unsigned char wakeup_req[] = { 0x05, 0xfa };
319 const unsigned char woken_req[] = { 0x06, 0xf9 };
320 const unsigned char sleep_req[] = { 0x07, 0x78 };
321 const unsigned char *hdr = h5->rx_skb->data;
322 const unsigned char *data = &h5->rx_skb->data[4];
324 BT_DBG("%s", hu->hdev->name);
326 if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT)
329 if (H5_HDR_LEN(hdr) < 2)
332 conf_req[2] = h5_cfg_field(h5);
334 if (memcmp(data, sync_req, 2) == 0) {
335 if (h5->state == H5_ACTIVE)
337 h5_link_control(hu, sync_rsp, 2);
338 } else if (memcmp(data, sync_rsp, 2) == 0) {
339 if (h5->state == H5_ACTIVE)
341 h5->state = H5_INITIALIZED;
342 h5_link_control(hu, conf_req, 3);
343 } else if (memcmp(data, conf_req, 2) == 0) {
344 h5_link_control(hu, conf_rsp, 2);
345 h5_link_control(hu, conf_req, 3);
346 } else if (memcmp(data, conf_rsp, 2) == 0) {
347 if (H5_HDR_LEN(hdr) > 2)
348 h5->tx_win = (data[2] & 0x07);
349 BT_DBG("Three-wire init complete. tx_win %u", h5->tx_win);
350 h5->state = H5_ACTIVE;
351 hci_uart_init_ready(hu);
353 } else if (memcmp(data, sleep_req, 2) == 0) {
354 BT_DBG("Peer went to sleep");
355 h5->sleep = H5_SLEEPING;
357 } else if (memcmp(data, woken_req, 2) == 0) {
358 BT_DBG("Peer woke up");
359 h5->sleep = H5_AWAKE;
360 } else if (memcmp(data, wakeup_req, 2) == 0) {
361 BT_DBG("Peer requested wakeup");
362 h5_link_control(hu, woken_req, 2);
363 h5->sleep = H5_AWAKE;
365 BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]);
369 hci_uart_tx_wakeup(hu);
372 static void h5_complete_rx_pkt(struct hci_uart *hu)
374 struct h5 *h5 = hu->priv;
375 const unsigned char *hdr = h5->rx_skb->data;
377 if (H5_HDR_RELIABLE(hdr)) {
378 h5->tx_ack = (h5->tx_ack + 1) % 8;
379 set_bit(H5_TX_ACK_REQ, &h5->flags);
380 hci_uart_tx_wakeup(hu);
383 h5->rx_ack = H5_HDR_ACK(hdr);
387 switch (H5_HDR_PKT_TYPE(hdr)) {
389 case HCI_ACLDATA_PKT:
390 case HCI_SCODATA_PKT:
391 hci_skb_pkt_type(h5->rx_skb) = H5_HDR_PKT_TYPE(hdr);
393 /* Remove Three-wire header */
394 skb_pull(h5->rx_skb, 4);
396 hci_recv_frame(hu->hdev, h5->rx_skb);
402 h5_handle_internal_rx(hu);
409 static int h5_rx_crc(struct hci_uart *hu, unsigned char c)
411 h5_complete_rx_pkt(hu);
416 static int h5_rx_payload(struct hci_uart *hu, unsigned char c)
418 struct h5 *h5 = hu->priv;
419 const unsigned char *hdr = h5->rx_skb->data;
421 if (H5_HDR_CRC(hdr)) {
422 h5->rx_func = h5_rx_crc;
425 h5_complete_rx_pkt(hu);
431 static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)
433 struct h5 *h5 = hu->priv;
434 const unsigned char *hdr = h5->rx_skb->data;
436 BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u",
437 hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
438 H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
441 if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) {
442 BT_ERR("Invalid header checksum");
447 if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) {
448 BT_ERR("Out-of-order packet arrived (%u != %u)",
449 H5_HDR_SEQ(hdr), h5->tx_ack);
454 if (h5->state != H5_ACTIVE &&
455 H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) {
456 BT_ERR("Non-link packet received in non-active state");
461 h5->rx_func = h5_rx_payload;
462 h5->rx_pending = H5_HDR_LEN(hdr);
467 static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c)
469 struct h5 *h5 = hu->priv;
471 if (c == SLIP_DELIMITER)
474 h5->rx_func = h5_rx_3wire_hdr;
477 h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC);
479 BT_ERR("Can't allocate mem for new packet");
484 h5->rx_skb->dev = (void *)hu->hdev;
489 static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c)
491 struct h5 *h5 = hu->priv;
493 if (c == SLIP_DELIMITER)
494 h5->rx_func = h5_rx_pkt_start;
499 static void h5_unslip_one_byte(struct h5 *h5, unsigned char c)
501 const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC;
504 if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) {
505 set_bit(H5_RX_ESC, &h5->flags);
509 if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) {
518 BT_ERR("Invalid esc byte 0x%02hhx", c);
524 skb_put_data(h5->rx_skb, byte, 1);
527 BT_DBG("unslipped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending);
530 static void h5_reset_rx(struct h5 *h5)
533 kfree_skb(h5->rx_skb);
537 h5->rx_func = h5_rx_delimiter;
539 clear_bit(H5_RX_ESC, &h5->flags);
542 static int h5_recv(struct hci_uart *hu, const void *data, int count)
544 struct h5 *h5 = hu->priv;
545 const unsigned char *ptr = data;
547 BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending,
553 if (h5->rx_pending > 0) {
554 if (*ptr == SLIP_DELIMITER) {
555 BT_ERR("Too short H5 packet");
560 h5_unslip_one_byte(h5, *ptr);
566 processed = h5->rx_func(hu, *ptr);
577 static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
579 struct h5 *h5 = hu->priv;
581 if (skb->len > 0xfff) {
582 BT_ERR("Packet too long (%u bytes)", skb->len);
587 if (h5->state != H5_ACTIVE) {
588 BT_ERR("Ignoring HCI data in non-active state");
593 switch (hci_skb_pkt_type(skb)) {
594 case HCI_ACLDATA_PKT:
595 case HCI_COMMAND_PKT:
596 skb_queue_tail(&h5->rel, skb);
599 case HCI_SCODATA_PKT:
600 skb_queue_tail(&h5->unrel, skb);
604 BT_ERR("Unknown packet type %u", hci_skb_pkt_type(skb));
612 static void h5_slip_delim(struct sk_buff *skb)
614 const char delim = SLIP_DELIMITER;
616 skb_put_data(skb, &delim, 1);
619 static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
621 const char esc_delim[2] = { SLIP_ESC, SLIP_ESC_DELIM };
622 const char esc_esc[2] = { SLIP_ESC, SLIP_ESC_ESC };
626 skb_put_data(skb, &esc_delim, 2);
629 skb_put_data(skb, &esc_esc, 2);
632 skb_put_data(skb, &c, 1);
636 static bool valid_packet_type(u8 type)
639 case HCI_ACLDATA_PKT:
640 case HCI_COMMAND_PKT:
641 case HCI_SCODATA_PKT:
642 case HCI_3WIRE_LINK_PKT:
643 case HCI_3WIRE_ACK_PKT:
650 static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type,
651 const u8 *data, size_t len)
653 struct h5 *h5 = hu->priv;
654 struct sk_buff *nskb;
658 if (!valid_packet_type(pkt_type)) {
659 BT_ERR("Unknown packet type %u", pkt_type);
664 * Max len of packet: (original len + 4 (H5 hdr) + 2 (crc)) * 2
665 * (because bytes 0xc0 and 0xdb are escaped, worst case is when
666 * the packet is all made of 0xc0 and 0xdb) + 2 (0xc0
667 * delimiters at start and end).
669 nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
673 hci_skb_pkt_type(nskb) = pkt_type;
677 hdr[0] = h5->tx_ack << 3;
678 clear_bit(H5_TX_ACK_REQ, &h5->flags);
680 /* Reliable packet? */
681 if (pkt_type == HCI_ACLDATA_PKT || pkt_type == HCI_COMMAND_PKT) {
683 hdr[0] |= h5->tx_seq;
684 h5->tx_seq = (h5->tx_seq + 1) % 8;
687 hdr[1] = pkt_type | ((len & 0x0f) << 4);
689 hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff);
691 BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u",
692 hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
693 H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
696 for (i = 0; i < 4; i++)
697 h5_slip_one_byte(nskb, hdr[i]);
699 for (i = 0; i < len; i++)
700 h5_slip_one_byte(nskb, data[i]);
707 static struct sk_buff *h5_dequeue(struct hci_uart *hu)
709 struct h5 *h5 = hu->priv;
711 struct sk_buff *skb, *nskb;
713 if (h5->sleep != H5_AWAKE) {
714 const unsigned char wakeup_req[] = { 0x05, 0xfa };
716 if (h5->sleep == H5_WAKING_UP)
719 h5->sleep = H5_WAKING_UP;
720 BT_DBG("Sending wakeup request");
722 mod_timer(&h5->timer, jiffies + HZ / 100);
723 return h5_prepare_pkt(hu, HCI_3WIRE_LINK_PKT, wakeup_req, 2);
726 skb = skb_dequeue(&h5->unrel);
728 nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb),
729 skb->data, skb->len);
735 skb_queue_head(&h5->unrel, skb);
736 BT_ERR("Could not dequeue pkt because alloc_skb failed");
739 spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
741 if (h5->unack.qlen >= h5->tx_win)
744 skb = skb_dequeue(&h5->rel);
746 nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb),
747 skb->data, skb->len);
749 __skb_queue_tail(&h5->unack, skb);
750 mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT);
751 spin_unlock_irqrestore(&h5->unack.lock, flags);
755 skb_queue_head(&h5->rel, skb);
756 BT_ERR("Could not dequeue pkt because alloc_skb failed");
760 spin_unlock_irqrestore(&h5->unack.lock, flags);
762 if (test_bit(H5_TX_ACK_REQ, &h5->flags))
763 return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0);
768 static int h5_flush(struct hci_uart *hu)
774 static const struct hci_uart_proto h5p = {
775 .id = HCI_UART_3WIRE,
776 .name = "Three-wire (H5)",
781 .enqueue = h5_enqueue,
782 .dequeue = h5_dequeue,
786 static int h5_serdev_probe(struct serdev_device *serdev)
788 const struct acpi_device_id *match;
789 struct device *dev = &serdev->dev;
792 h5 = devm_kzalloc(dev, sizeof(*h5), GFP_KERNEL);
796 set_bit(HCI_UART_RESET_ON_INIT, &h5->serdev_hu.hdev_flags);
798 h5->hu = &h5->serdev_hu;
799 h5->serdev_hu.serdev = serdev;
800 serdev_device_set_drvdata(serdev, h5);
802 if (has_acpi_companion(dev)) {
803 match = acpi_match_device(dev->driver->acpi_match_table, dev);
807 h5->vnd = (const struct h5_vnd *)match->driver_data;
808 h5->id = (char *)match->id;
810 if (h5->vnd->acpi_gpio_map)
811 devm_acpi_dev_add_driver_gpios(dev,
812 h5->vnd->acpi_gpio_map);
815 h5->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
816 if (IS_ERR(h5->enable_gpio))
817 return PTR_ERR(h5->enable_gpio);
819 h5->device_wake_gpio = devm_gpiod_get_optional(dev, "device-wake",
821 if (IS_ERR(h5->device_wake_gpio))
822 return PTR_ERR(h5->device_wake_gpio);
824 return hci_uart_register_device(&h5->serdev_hu, &h5p);
827 static void h5_serdev_remove(struct serdev_device *serdev)
829 struct h5 *h5 = serdev_device_get_drvdata(serdev);
831 hci_uart_unregister_device(&h5->serdev_hu);
834 static int __maybe_unused h5_serdev_suspend(struct device *dev)
836 struct h5 *h5 = dev_get_drvdata(dev);
839 if (h5->vnd && h5->vnd->suspend)
840 ret = h5->vnd->suspend(h5);
845 static int __maybe_unused h5_serdev_resume(struct device *dev)
847 struct h5 *h5 = dev_get_drvdata(dev);
850 if (h5->vnd && h5->vnd->resume)
851 ret = h5->vnd->resume(h5);
856 #ifdef CONFIG_BT_HCIUART_RTL
857 static int h5_btrtl_setup(struct h5 *h5)
859 struct btrtl_device_info *btrtl_dev;
861 __le32 baudrate_data;
863 unsigned int controller_baudrate;
867 btrtl_dev = btrtl_initialize(h5->hu->hdev, h5->id);
868 if (IS_ERR(btrtl_dev))
869 return PTR_ERR(btrtl_dev);
871 err = btrtl_get_uart_settings(h5->hu->hdev, btrtl_dev,
872 &controller_baudrate, &device_baudrate,
877 baudrate_data = cpu_to_le32(device_baudrate);
878 skb = __hci_cmd_sync(h5->hu->hdev, 0xfc17, sizeof(baudrate_data),
879 &baudrate_data, HCI_INIT_TIMEOUT);
881 rtl_dev_err(h5->hu->hdev, "set baud rate command failed\n");
887 /* Give the device some time to set up the new baudrate. */
888 usleep_range(10000, 20000);
890 serdev_device_set_baudrate(h5->hu->serdev, controller_baudrate);
891 serdev_device_set_flow_control(h5->hu->serdev, flow_control);
893 err = btrtl_download_firmware(h5->hu->hdev, btrtl_dev);
894 /* Give the device some time before the hci-core sends it a reset */
895 usleep_range(10000, 20000);
897 /* Enable controller to do both LE scan and BR/EDR inquiry
900 set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &h5->hu->hdev->quirks);
903 btrtl_free(btrtl_dev);
908 static void h5_btrtl_open(struct h5 *h5)
910 /* Devices always start with these fixed parameters */
911 serdev_device_set_flow_control(h5->hu->serdev, false);
912 serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN);
913 serdev_device_set_baudrate(h5->hu->serdev, 115200);
915 /* The controller needs up to 500ms to wakeup */
916 gpiod_set_value_cansleep(h5->enable_gpio, 1);
917 gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
921 static void h5_btrtl_close(struct h5 *h5)
923 gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
924 gpiod_set_value_cansleep(h5->enable_gpio, 0);
927 /* Suspend/resume support. On many devices the RTL BT device loses power during
928 * suspend/resume, causing it to lose its firmware and all state. So we simply
929 * turn it off on suspend and reprobe on resume. This mirrors how RTL devices
930 * are handled in the USB driver, where the USB_QUIRK_RESET_RESUME is used which
931 * also causes a reprobe on resume.
933 static int h5_btrtl_suspend(struct h5 *h5)
935 serdev_device_set_flow_control(h5->hu->serdev, false);
936 gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
937 gpiod_set_value_cansleep(h5->enable_gpio, 0);
941 struct h5_btrtl_reprobe {
943 struct work_struct work;
946 static void h5_btrtl_reprobe_worker(struct work_struct *work)
948 struct h5_btrtl_reprobe *reprobe =
949 container_of(work, struct h5_btrtl_reprobe, work);
952 ret = device_reprobe(reprobe->dev);
953 if (ret && ret != -EPROBE_DEFER)
954 dev_err(reprobe->dev, "Reprobe error %d\n", ret);
956 put_device(reprobe->dev);
958 module_put(THIS_MODULE);
961 static int h5_btrtl_resume(struct h5 *h5)
963 struct h5_btrtl_reprobe *reprobe;
965 reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);
969 __module_get(THIS_MODULE);
971 INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);
972 reprobe->dev = get_device(&h5->hu->serdev->dev);
973 queue_work(system_long_wq, &reprobe->work);
977 static const struct acpi_gpio_params btrtl_device_wake_gpios = { 0, 0, false };
978 static const struct acpi_gpio_params btrtl_enable_gpios = { 1, 0, false };
979 static const struct acpi_gpio_params btrtl_host_wake_gpios = { 2, 0, false };
980 static const struct acpi_gpio_mapping acpi_btrtl_gpios[] = {
981 { "device-wake-gpios", &btrtl_device_wake_gpios, 1 },
982 { "enable-gpios", &btrtl_enable_gpios, 1 },
983 { "host-wake-gpios", &btrtl_host_wake_gpios, 1 },
987 static struct h5_vnd rtl_vnd = {
988 .setup = h5_btrtl_setup,
989 .open = h5_btrtl_open,
990 .close = h5_btrtl_close,
991 .suspend = h5_btrtl_suspend,
992 .resume = h5_btrtl_resume,
993 .acpi_gpio_map = acpi_btrtl_gpios,
998 static const struct acpi_device_id h5_acpi_match[] = {
999 #ifdef CONFIG_BT_HCIUART_RTL
1000 { "OBDA8723", (kernel_ulong_t)&rtl_vnd },
1004 MODULE_DEVICE_TABLE(acpi, h5_acpi_match);
1007 static const struct dev_pm_ops h5_serdev_pm_ops = {
1008 SET_SYSTEM_SLEEP_PM_OPS(h5_serdev_suspend, h5_serdev_resume)
1011 static struct serdev_device_driver h5_serdev_driver = {
1012 .probe = h5_serdev_probe,
1013 .remove = h5_serdev_remove,
1015 .name = "hci_uart_h5",
1016 .acpi_match_table = ACPI_PTR(h5_acpi_match),
1017 .pm = &h5_serdev_pm_ops,
1021 int __init h5_init(void)
1023 serdev_device_driver_register(&h5_serdev_driver);
1024 return hci_uart_register_proto(&h5p);
1027 int __exit h5_deinit(void)
1029 serdev_device_driver_unregister(&h5_serdev_driver);
1030 return hci_uart_unregister_proto(&h5p);