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/of_device.h>
15 #include <linux/serdev.h>
16 #include <linux/skbuff.h>
18 #include <net/bluetooth/bluetooth.h>
19 #include <net/bluetooth/hci_core.h>
24 #define HCI_3WIRE_ACK_PKT 0
25 #define HCI_3WIRE_LINK_PKT 15
27 /* Sliding window size */
28 #define H5_TX_WIN_MAX 4
30 #define H5_ACK_TIMEOUT msecs_to_jiffies(250)
31 #define H5_SYNC_TIMEOUT msecs_to_jiffies(100)
34 * Maximum Three-wire packet:
35 * 4 byte header + max value for 12-bit length + 2 bytes for CRC
37 #define H5_MAX_LEN (4 + 0xfff + 2)
39 /* Convenience macros for reading Three-wire header values */
40 #define H5_HDR_SEQ(hdr) ((hdr)[0] & 0x07)
41 #define H5_HDR_ACK(hdr) (((hdr)[0] >> 3) & 0x07)
42 #define H5_HDR_CRC(hdr) (((hdr)[0] >> 6) & 0x01)
43 #define H5_HDR_RELIABLE(hdr) (((hdr)[0] >> 7) & 0x01)
44 #define H5_HDR_PKT_TYPE(hdr) ((hdr)[1] & 0x0f)
45 #define H5_HDR_LEN(hdr) ((((hdr)[1] >> 4) & 0x0f) + ((hdr)[2] << 4))
47 #define SLIP_DELIMITER 0xc0
49 #define SLIP_ESC_DELIM 0xdc
50 #define SLIP_ESC_ESC 0xdd
54 H5_RX_ESC, /* SLIP escape mode */
55 H5_TX_ACK_REQ, /* Pending ack to send */
56 H5_WAKEUP_DISABLE, /* Device cannot wake host */
60 /* Must be the first member, hci_serdev.c expects this. */
61 struct hci_uart serdev_hu;
63 struct sk_buff_head unack; /* Unack'ed packets queue */
64 struct sk_buff_head rel; /* Reliable packets queue */
65 struct sk_buff_head unrel; /* Unreliable packets queue */
69 struct sk_buff *rx_skb; /* Receive buffer */
70 size_t rx_pending; /* Expecting more bytes */
71 u8 rx_ack; /* Last ack number received */
73 int (*rx_func)(struct hci_uart *hu, u8 c);
75 struct timer_list timer; /* Retransmission timer */
76 struct hci_uart *hu; /* Parent HCI UART */
78 u8 tx_seq; /* Next seq number to send */
79 u8 tx_ack; /* Next ack number to send */
80 u8 tx_win; /* Sliding window size */
94 const struct h5_vnd *vnd;
97 struct gpio_desc *enable_gpio;
98 struct gpio_desc *device_wake_gpio;
101 enum h5_driver_info {
102 H5_INFO_WAKEUP_DISABLE = BIT(0),
106 int (*setup)(struct h5 *h5);
107 void (*open)(struct h5 *h5);
108 void (*close)(struct h5 *h5);
109 int (*suspend)(struct h5 *h5);
110 int (*resume)(struct h5 *h5);
111 const struct acpi_gpio_mapping *acpi_gpio_map;
114 struct h5_device_data {
115 uint32_t driver_info;
119 static void h5_reset_rx(struct h5 *h5);
121 static void h5_link_control(struct hci_uart *hu, const void *data, size_t len)
123 struct h5 *h5 = hu->priv;
124 struct sk_buff *nskb;
126 nskb = alloc_skb(3, GFP_ATOMIC);
130 hci_skb_pkt_type(nskb) = HCI_3WIRE_LINK_PKT;
132 skb_put_data(nskb, data, len);
134 skb_queue_tail(&h5->unrel, nskb);
137 static u8 h5_cfg_field(struct h5 *h5)
139 /* Sliding window size (first 3 bits) */
140 return h5->tx_win & 0x07;
143 static void h5_timed_event(struct timer_list *t)
145 const unsigned char sync_req[] = { 0x01, 0x7e };
146 unsigned char conf_req[3] = { 0x03, 0xfc };
147 struct h5 *h5 = from_timer(h5, t, timer);
148 struct hci_uart *hu = h5->hu;
152 BT_DBG("%s", hu->hdev->name);
154 if (h5->state == H5_UNINITIALIZED)
155 h5_link_control(hu, sync_req, sizeof(sync_req));
157 if (h5->state == H5_INITIALIZED) {
158 conf_req[2] = h5_cfg_field(h5);
159 h5_link_control(hu, conf_req, sizeof(conf_req));
162 if (h5->state != H5_ACTIVE) {
163 mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);
167 if (h5->sleep != H5_AWAKE) {
168 h5->sleep = H5_SLEEPING;
172 BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen);
174 spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
176 while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
177 h5->tx_seq = (h5->tx_seq - 1) & 0x07;
178 skb_queue_head(&h5->rel, skb);
181 spin_unlock_irqrestore(&h5->unack.lock, flags);
184 hci_uart_tx_wakeup(hu);
187 static void h5_peer_reset(struct hci_uart *hu)
189 struct h5 *h5 = hu->priv;
191 bt_dev_err(hu->hdev, "Peer device has reset");
193 h5->state = H5_UNINITIALIZED;
195 del_timer(&h5->timer);
197 skb_queue_purge(&h5->rel);
198 skb_queue_purge(&h5->unrel);
199 skb_queue_purge(&h5->unack);
204 /* Send reset request to upper stack */
205 hci_reset_dev(hu->hdev);
208 static int h5_open(struct hci_uart *hu)
211 const unsigned char sync[] = { 0x01, 0x7e };
216 h5 = serdev_device_get_drvdata(hu->serdev);
218 h5 = kzalloc(sizeof(*h5), GFP_KERNEL);
226 skb_queue_head_init(&h5->unack);
227 skb_queue_head_init(&h5->rel);
228 skb_queue_head_init(&h5->unrel);
232 timer_setup(&h5->timer, h5_timed_event, 0);
234 h5->tx_win = H5_TX_WIN_MAX;
236 if (h5->vnd && h5->vnd->open)
239 set_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags);
241 /* Send initial sync request */
242 h5_link_control(hu, sync, sizeof(sync));
243 mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);
248 static int h5_close(struct hci_uart *hu)
250 struct h5 *h5 = hu->priv;
252 del_timer_sync(&h5->timer);
254 skb_queue_purge(&h5->unack);
255 skb_queue_purge(&h5->rel);
256 skb_queue_purge(&h5->unrel);
258 kfree_skb(h5->rx_skb);
261 if (h5->vnd && h5->vnd->close)
270 static int h5_setup(struct hci_uart *hu)
272 struct h5 *h5 = hu->priv;
274 if (h5->vnd && h5->vnd->setup)
275 return h5->vnd->setup(h5);
280 static void h5_pkt_cull(struct h5 *h5)
282 struct sk_buff *skb, *tmp;
287 spin_lock_irqsave(&h5->unack.lock, flags);
289 to_remove = skb_queue_len(&h5->unack);
295 while (to_remove > 0) {
296 if (h5->rx_ack == seq)
300 seq = (seq - 1) & 0x07;
303 if (seq != h5->rx_ack)
304 BT_ERR("Controller acked invalid packet");
307 skb_queue_walk_safe(&h5->unack, skb, tmp) {
308 if (i++ >= to_remove)
311 __skb_unlink(skb, &h5->unack);
315 if (skb_queue_empty(&h5->unack))
316 del_timer(&h5->timer);
319 spin_unlock_irqrestore(&h5->unack.lock, flags);
322 static void h5_handle_internal_rx(struct hci_uart *hu)
324 struct h5 *h5 = hu->priv;
325 const unsigned char sync_req[] = { 0x01, 0x7e };
326 const unsigned char sync_rsp[] = { 0x02, 0x7d };
327 unsigned char conf_req[3] = { 0x03, 0xfc };
328 const unsigned char conf_rsp[] = { 0x04, 0x7b };
329 const unsigned char wakeup_req[] = { 0x05, 0xfa };
330 const unsigned char woken_req[] = { 0x06, 0xf9 };
331 const unsigned char sleep_req[] = { 0x07, 0x78 };
332 const unsigned char *hdr = h5->rx_skb->data;
333 const unsigned char *data = &h5->rx_skb->data[4];
335 BT_DBG("%s", hu->hdev->name);
337 if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT)
340 if (H5_HDR_LEN(hdr) < 2)
343 conf_req[2] = h5_cfg_field(h5);
345 if (memcmp(data, sync_req, 2) == 0) {
346 if (h5->state == H5_ACTIVE)
348 h5_link_control(hu, sync_rsp, 2);
349 } else if (memcmp(data, sync_rsp, 2) == 0) {
350 if (h5->state == H5_ACTIVE)
352 h5->state = H5_INITIALIZED;
353 h5_link_control(hu, conf_req, 3);
354 } else if (memcmp(data, conf_req, 2) == 0) {
355 h5_link_control(hu, conf_rsp, 2);
356 h5_link_control(hu, conf_req, 3);
357 } else if (memcmp(data, conf_rsp, 2) == 0) {
358 if (H5_HDR_LEN(hdr) > 2)
359 h5->tx_win = (data[2] & 0x07);
360 BT_DBG("Three-wire init complete. tx_win %u", h5->tx_win);
361 h5->state = H5_ACTIVE;
362 hci_uart_init_ready(hu);
364 } else if (memcmp(data, sleep_req, 2) == 0) {
365 BT_DBG("Peer went to sleep");
366 h5->sleep = H5_SLEEPING;
368 } else if (memcmp(data, woken_req, 2) == 0) {
369 BT_DBG("Peer woke up");
370 h5->sleep = H5_AWAKE;
371 } else if (memcmp(data, wakeup_req, 2) == 0) {
372 BT_DBG("Peer requested wakeup");
373 h5_link_control(hu, woken_req, 2);
374 h5->sleep = H5_AWAKE;
376 BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]);
380 hci_uart_tx_wakeup(hu);
383 static void h5_complete_rx_pkt(struct hci_uart *hu)
385 struct h5 *h5 = hu->priv;
386 const unsigned char *hdr = h5->rx_skb->data;
388 if (H5_HDR_RELIABLE(hdr)) {
389 h5->tx_ack = (h5->tx_ack + 1) % 8;
390 set_bit(H5_TX_ACK_REQ, &h5->flags);
391 hci_uart_tx_wakeup(hu);
394 h5->rx_ack = H5_HDR_ACK(hdr);
398 switch (H5_HDR_PKT_TYPE(hdr)) {
400 case HCI_ACLDATA_PKT:
401 case HCI_SCODATA_PKT:
402 case HCI_ISODATA_PKT:
403 hci_skb_pkt_type(h5->rx_skb) = H5_HDR_PKT_TYPE(hdr);
405 /* Remove Three-wire header */
406 skb_pull(h5->rx_skb, 4);
408 hci_recv_frame(hu->hdev, h5->rx_skb);
414 h5_handle_internal_rx(hu);
421 static int h5_rx_crc(struct hci_uart *hu, unsigned char c)
423 h5_complete_rx_pkt(hu);
428 static int h5_rx_payload(struct hci_uart *hu, unsigned char c)
430 struct h5 *h5 = hu->priv;
431 const unsigned char *hdr = h5->rx_skb->data;
433 if (H5_HDR_CRC(hdr)) {
434 h5->rx_func = h5_rx_crc;
437 h5_complete_rx_pkt(hu);
443 static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)
445 struct h5 *h5 = hu->priv;
446 const unsigned char *hdr = h5->rx_skb->data;
448 BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u",
449 hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
450 H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
453 if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) {
454 bt_dev_err(hu->hdev, "Invalid header checksum");
459 if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) {
460 bt_dev_err(hu->hdev, "Out-of-order packet arrived (%u != %u)",
461 H5_HDR_SEQ(hdr), h5->tx_ack);
466 if (h5->state != H5_ACTIVE &&
467 H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) {
468 bt_dev_err(hu->hdev, "Non-link packet received in non-active state");
473 h5->rx_func = h5_rx_payload;
474 h5->rx_pending = H5_HDR_LEN(hdr);
479 static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c)
481 struct h5 *h5 = hu->priv;
483 if (c == SLIP_DELIMITER)
486 h5->rx_func = h5_rx_3wire_hdr;
489 h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC);
491 bt_dev_err(hu->hdev, "Can't allocate mem for new packet");
496 h5->rx_skb->dev = (void *)hu->hdev;
501 static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c)
503 struct h5 *h5 = hu->priv;
505 if (c == SLIP_DELIMITER)
506 h5->rx_func = h5_rx_pkt_start;
511 static void h5_unslip_one_byte(struct h5 *h5, unsigned char c)
513 const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC;
516 if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) {
517 set_bit(H5_RX_ESC, &h5->flags);
521 if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) {
530 BT_ERR("Invalid esc byte 0x%02hhx", c);
536 skb_put_data(h5->rx_skb, byte, 1);
539 BT_DBG("unslipped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending);
542 static void h5_reset_rx(struct h5 *h5)
545 kfree_skb(h5->rx_skb);
549 h5->rx_func = h5_rx_delimiter;
551 clear_bit(H5_RX_ESC, &h5->flags);
554 static int h5_recv(struct hci_uart *hu, const void *data, int count)
556 struct h5 *h5 = hu->priv;
557 const unsigned char *ptr = data;
559 BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending,
565 if (h5->rx_pending > 0) {
566 if (*ptr == SLIP_DELIMITER) {
567 bt_dev_err(hu->hdev, "Too short H5 packet");
572 h5_unslip_one_byte(h5, *ptr);
578 processed = h5->rx_func(hu, *ptr);
589 static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
591 struct h5 *h5 = hu->priv;
593 if (skb->len > 0xfff) {
594 bt_dev_err(hu->hdev, "Packet too long (%u bytes)", skb->len);
599 if (h5->state != H5_ACTIVE) {
600 bt_dev_err(hu->hdev, "Ignoring HCI data in non-active state");
605 switch (hci_skb_pkt_type(skb)) {
606 case HCI_ACLDATA_PKT:
607 case HCI_COMMAND_PKT:
608 skb_queue_tail(&h5->rel, skb);
611 case HCI_SCODATA_PKT:
612 case HCI_ISODATA_PKT:
613 skb_queue_tail(&h5->unrel, skb);
617 bt_dev_err(hu->hdev, "Unknown packet type %u", hci_skb_pkt_type(skb));
625 static void h5_slip_delim(struct sk_buff *skb)
627 const char delim = SLIP_DELIMITER;
629 skb_put_data(skb, &delim, 1);
632 static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
634 const char esc_delim[2] = { SLIP_ESC, SLIP_ESC_DELIM };
635 const char esc_esc[2] = { SLIP_ESC, SLIP_ESC_ESC };
639 skb_put_data(skb, &esc_delim, 2);
642 skb_put_data(skb, &esc_esc, 2);
645 skb_put_data(skb, &c, 1);
649 static bool valid_packet_type(u8 type)
652 case HCI_ACLDATA_PKT:
653 case HCI_COMMAND_PKT:
654 case HCI_SCODATA_PKT:
655 case HCI_ISODATA_PKT:
656 case HCI_3WIRE_LINK_PKT:
657 case HCI_3WIRE_ACK_PKT:
664 static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type,
665 const u8 *data, size_t len)
667 struct h5 *h5 = hu->priv;
668 struct sk_buff *nskb;
672 if (!valid_packet_type(pkt_type)) {
673 bt_dev_err(hu->hdev, "Unknown packet type %u", pkt_type);
678 * Max len of packet: (original len + 4 (H5 hdr) + 2 (crc)) * 2
679 * (because bytes 0xc0 and 0xdb are escaped, worst case is when
680 * the packet is all made of 0xc0 and 0xdb) + 2 (0xc0
681 * delimiters at start and end).
683 nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
687 hci_skb_pkt_type(nskb) = pkt_type;
691 hdr[0] = h5->tx_ack << 3;
692 clear_bit(H5_TX_ACK_REQ, &h5->flags);
694 /* Reliable packet? */
695 if (pkt_type == HCI_ACLDATA_PKT || pkt_type == HCI_COMMAND_PKT) {
697 hdr[0] |= h5->tx_seq;
698 h5->tx_seq = (h5->tx_seq + 1) % 8;
701 hdr[1] = pkt_type | ((len & 0x0f) << 4);
703 hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff);
705 BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u",
706 hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
707 H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
710 for (i = 0; i < 4; i++)
711 h5_slip_one_byte(nskb, hdr[i]);
713 for (i = 0; i < len; i++)
714 h5_slip_one_byte(nskb, data[i]);
721 static struct sk_buff *h5_dequeue(struct hci_uart *hu)
723 struct h5 *h5 = hu->priv;
725 struct sk_buff *skb, *nskb;
727 if (h5->sleep != H5_AWAKE) {
728 const unsigned char wakeup_req[] = { 0x05, 0xfa };
730 if (h5->sleep == H5_WAKING_UP)
733 h5->sleep = H5_WAKING_UP;
734 BT_DBG("Sending wakeup request");
736 mod_timer(&h5->timer, jiffies + HZ / 100);
737 return h5_prepare_pkt(hu, HCI_3WIRE_LINK_PKT, wakeup_req, 2);
740 skb = skb_dequeue(&h5->unrel);
742 nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb),
743 skb->data, skb->len);
749 skb_queue_head(&h5->unrel, skb);
750 bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed");
753 spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
755 if (h5->unack.qlen >= h5->tx_win)
758 skb = skb_dequeue(&h5->rel);
760 nskb = h5_prepare_pkt(hu, hci_skb_pkt_type(skb),
761 skb->data, skb->len);
763 __skb_queue_tail(&h5->unack, skb);
764 mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT);
765 spin_unlock_irqrestore(&h5->unack.lock, flags);
769 skb_queue_head(&h5->rel, skb);
770 bt_dev_err(hu->hdev, "Could not dequeue pkt because alloc_skb failed");
774 spin_unlock_irqrestore(&h5->unack.lock, flags);
776 if (test_bit(H5_TX_ACK_REQ, &h5->flags))
777 return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0);
782 static int h5_flush(struct hci_uart *hu)
788 static const struct hci_uart_proto h5p = {
789 .id = HCI_UART_3WIRE,
790 .name = "Three-wire (H5)",
795 .enqueue = h5_enqueue,
796 .dequeue = h5_dequeue,
800 static int h5_serdev_probe(struct serdev_device *serdev)
802 struct device *dev = &serdev->dev;
804 const struct h5_device_data *data;
807 h5 = devm_kzalloc(dev, sizeof(*h5), GFP_KERNEL);
811 h5->hu = &h5->serdev_hu;
812 h5->serdev_hu.serdev = serdev;
813 serdev_device_set_drvdata(serdev, h5);
815 if (has_acpi_companion(dev)) {
816 const struct acpi_device_id *match;
818 match = acpi_match_device(dev->driver->acpi_match_table, dev);
822 data = (const struct h5_device_data *)match->driver_data;
824 h5->id = (char *)match->id;
826 if (h5->vnd->acpi_gpio_map)
827 devm_acpi_dev_add_driver_gpios(dev,
828 h5->vnd->acpi_gpio_map);
830 data = of_device_get_match_data(dev);
838 h5->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
839 if (IS_ERR(h5->enable_gpio))
840 return PTR_ERR(h5->enable_gpio);
842 h5->device_wake_gpio = devm_gpiod_get_optional(dev, "device-wake",
844 if (IS_ERR(h5->device_wake_gpio))
845 return PTR_ERR(h5->device_wake_gpio);
847 err = hci_uart_register_device(&h5->serdev_hu, &h5p);
851 if (data->driver_info & H5_INFO_WAKEUP_DISABLE)
852 set_bit(H5_WAKEUP_DISABLE, &h5->flags);
857 static void h5_serdev_remove(struct serdev_device *serdev)
859 struct h5 *h5 = serdev_device_get_drvdata(serdev);
861 hci_uart_unregister_device(&h5->serdev_hu);
864 static int __maybe_unused h5_serdev_suspend(struct device *dev)
866 struct h5 *h5 = dev_get_drvdata(dev);
869 if (h5->vnd && h5->vnd->suspend)
870 ret = h5->vnd->suspend(h5);
875 static int __maybe_unused h5_serdev_resume(struct device *dev)
877 struct h5 *h5 = dev_get_drvdata(dev);
880 if (h5->vnd && h5->vnd->resume)
881 ret = h5->vnd->resume(h5);
886 #ifdef CONFIG_BT_HCIUART_RTL
887 static int h5_btrtl_setup(struct h5 *h5)
889 struct btrtl_device_info *btrtl_dev;
891 __le32 baudrate_data;
893 unsigned int controller_baudrate;
897 btrtl_dev = btrtl_initialize(h5->hu->hdev, h5->id);
898 if (IS_ERR(btrtl_dev))
899 return PTR_ERR(btrtl_dev);
901 err = btrtl_get_uart_settings(h5->hu->hdev, btrtl_dev,
902 &controller_baudrate, &device_baudrate,
907 baudrate_data = cpu_to_le32(device_baudrate);
908 skb = __hci_cmd_sync(h5->hu->hdev, 0xfc17, sizeof(baudrate_data),
909 &baudrate_data, HCI_INIT_TIMEOUT);
911 rtl_dev_err(h5->hu->hdev, "set baud rate command failed\n");
917 /* Give the device some time to set up the new baudrate. */
918 usleep_range(10000, 20000);
920 serdev_device_set_baudrate(h5->hu->serdev, controller_baudrate);
921 serdev_device_set_flow_control(h5->hu->serdev, flow_control);
923 err = btrtl_download_firmware(h5->hu->hdev, btrtl_dev);
924 /* Give the device some time before the hci-core sends it a reset */
925 usleep_range(10000, 20000);
927 btrtl_set_quirks(h5->hu->hdev, btrtl_dev);
930 btrtl_free(btrtl_dev);
935 static void h5_btrtl_open(struct h5 *h5)
938 * Since h5_btrtl_resume() does a device_reprobe() the suspend handling
939 * done by the hci_suspend_notifier is not necessary; it actually causes
940 * delays and a bunch of errors to get logged, so disable it.
942 if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))
943 set_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &h5->hu->flags);
945 /* Devices always start with these fixed parameters */
946 serdev_device_set_flow_control(h5->hu->serdev, false);
947 serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN);
948 serdev_device_set_baudrate(h5->hu->serdev, 115200);
950 /* The controller needs up to 500ms to wakeup */
951 gpiod_set_value_cansleep(h5->enable_gpio, 1);
952 gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
956 static void h5_btrtl_close(struct h5 *h5)
958 gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
959 gpiod_set_value_cansleep(h5->enable_gpio, 0);
962 /* Suspend/resume support. On many devices the RTL BT device loses power during
963 * suspend/resume, causing it to lose its firmware and all state. So we simply
964 * turn it off on suspend and reprobe on resume. This mirrors how RTL devices
965 * are handled in the USB driver, where the BTUSB_WAKEUP_DISABLE is used which
966 * also causes a reprobe on resume.
968 static int h5_btrtl_suspend(struct h5 *h5)
970 serdev_device_set_flow_control(h5->hu->serdev, false);
971 gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
973 if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))
974 gpiod_set_value_cansleep(h5->enable_gpio, 0);
979 struct h5_btrtl_reprobe {
981 struct work_struct work;
984 static void h5_btrtl_reprobe_worker(struct work_struct *work)
986 struct h5_btrtl_reprobe *reprobe =
987 container_of(work, struct h5_btrtl_reprobe, work);
990 ret = device_reprobe(reprobe->dev);
991 if (ret && ret != -EPROBE_DEFER)
992 dev_err(reprobe->dev, "Reprobe error %d\n", ret);
994 put_device(reprobe->dev);
996 module_put(THIS_MODULE);
999 static int h5_btrtl_resume(struct h5 *h5)
1001 if (test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {
1002 struct h5_btrtl_reprobe *reprobe;
1004 reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);
1008 __module_get(THIS_MODULE);
1010 INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);
1011 reprobe->dev = get_device(&h5->hu->serdev->dev);
1012 queue_work(system_long_wq, &reprobe->work);
1014 gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
1019 static const struct acpi_gpio_params btrtl_device_wake_gpios = { 0, 0, false };
1020 static const struct acpi_gpio_params btrtl_enable_gpios = { 1, 0, false };
1021 static const struct acpi_gpio_params btrtl_host_wake_gpios = { 2, 0, false };
1022 static const struct acpi_gpio_mapping acpi_btrtl_gpios[] = {
1023 { "device-wake-gpios", &btrtl_device_wake_gpios, 1 },
1024 { "enable-gpios", &btrtl_enable_gpios, 1 },
1025 { "host-wake-gpios", &btrtl_host_wake_gpios, 1 },
1029 static struct h5_vnd rtl_vnd = {
1030 .setup = h5_btrtl_setup,
1031 .open = h5_btrtl_open,
1032 .close = h5_btrtl_close,
1033 .suspend = h5_btrtl_suspend,
1034 .resume = h5_btrtl_resume,
1035 .acpi_gpio_map = acpi_btrtl_gpios,
1038 static const struct h5_device_data h5_data_rtl8822cs = {
1042 static const struct h5_device_data h5_data_rtl8723bs = {
1043 .driver_info = H5_INFO_WAKEUP_DISABLE,
1049 static const struct acpi_device_id h5_acpi_match[] = {
1050 #ifdef CONFIG_BT_HCIUART_RTL
1051 { "OBDA0623", (kernel_ulong_t)&h5_data_rtl8723bs },
1052 { "OBDA8723", (kernel_ulong_t)&h5_data_rtl8723bs },
1056 MODULE_DEVICE_TABLE(acpi, h5_acpi_match);
1059 static const struct dev_pm_ops h5_serdev_pm_ops = {
1060 SET_SYSTEM_SLEEP_PM_OPS(h5_serdev_suspend, h5_serdev_resume)
1063 static const struct of_device_id rtl_bluetooth_of_match[] = {
1064 #ifdef CONFIG_BT_HCIUART_RTL
1065 { .compatible = "realtek,rtl8822cs-bt",
1066 .data = (const void *)&h5_data_rtl8822cs },
1067 { .compatible = "realtek,rtl8723bs-bt",
1068 .data = (const void *)&h5_data_rtl8723bs },
1069 { .compatible = "realtek,rtl8723ds-bt",
1070 .data = (const void *)&h5_data_rtl8723bs },
1074 MODULE_DEVICE_TABLE(of, rtl_bluetooth_of_match);
1076 static struct serdev_device_driver h5_serdev_driver = {
1077 .probe = h5_serdev_probe,
1078 .remove = h5_serdev_remove,
1080 .name = "hci_uart_h5",
1081 .acpi_match_table = ACPI_PTR(h5_acpi_match),
1082 .pm = &h5_serdev_pm_ops,
1083 .of_match_table = rtl_bluetooth_of_match,
1087 int __init h5_init(void)
1089 serdev_device_driver_register(&h5_serdev_driver);
1090 return hci_uart_register_proto(&h5p);
1093 int __exit h5_deinit(void)
1095 serdev_device_driver_unregister(&h5_serdev_driver);
1096 return hci_uart_unregister_proto(&h5p);