1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2018 MediaTek Inc.
5 * Bluetooth support for MediaTek serial devices
7 * Author: Sean Wang <sean.wang@mediatek.com>
11 #include <asm/unaligned.h>
12 #include <linux/atomic.h>
13 #include <linux/clk.h>
14 #include <linux/firmware.h>
15 #include <linux/gpio/consumer.h>
16 #include <linux/iopoll.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
20 #include <linux/pinctrl/consumer.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/regulator/consumer.h>
23 #include <linux/serdev.h>
24 #include <linux/skbuff.h>
26 #include <net/bluetooth/bluetooth.h>
27 #include <net/bluetooth/hci_core.h>
34 #define MTK_STP_TLR_SIZE 2
36 #define BTMTKUART_TX_STATE_ACTIVE 1
37 #define BTMTKUART_TX_STATE_WAKEUP 2
38 #define BTMTKUART_TX_WAIT_VND_EVT 3
39 #define BTMTKUART_REQUIRED_WAKEUP 4
41 #define BTMTKUART_FLAG_STANDALONE_HW BIT(0)
49 struct btmtkuart_data {
54 struct btmtkuart_dev {
56 struct serdev_device *serdev;
60 struct regulator *vcc;
61 struct gpio_desc *reset;
62 struct gpio_desc *boot;
63 struct pinctrl *pinctrl;
64 struct pinctrl_state *pins_runtime;
65 struct pinctrl_state *pins_boot;
66 speed_t desired_speed;
69 struct work_struct tx_work;
70 unsigned long tx_state;
71 struct sk_buff_head txq;
73 struct sk_buff *rx_skb;
74 struct sk_buff *evt_skb;
80 const struct btmtkuart_data *data;
83 #define btmtkuart_is_standalone(bdev) \
84 ((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
85 #define btmtkuart_is_builtin_soc(bdev) \
86 !((bdev)->data->flags & BTMTKUART_FLAG_STANDALONE_HW)
88 static int mtk_hci_wmt_sync(struct hci_dev *hdev,
89 struct btmtk_hci_wmt_params *wmt_params)
91 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
92 struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
93 u32 hlen, status = BTMTK_WMT_INVALID;
94 struct btmtk_hci_wmt_evt *wmt_evt;
95 struct btmtk_hci_wmt_cmd *wc;
96 struct btmtk_wmt_hdr *hdr;
99 /* Send the WMT command and wait until the WMT event returns */
100 hlen = sizeof(*hdr) + wmt_params->dlen;
106 wc = kzalloc(hlen, GFP_KERNEL);
114 hdr->op = wmt_params->op;
115 hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
116 hdr->flag = wmt_params->flag;
117 memcpy(wc->data, wmt_params->data, wmt_params->dlen);
119 set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
121 err = __hci_cmd_send(hdev, 0xfc6f, hlen, wc);
123 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
127 /* The vendor specific WMT commands are all answered by a vendor
128 * specific event and will not have the Command Status or Command
129 * Complete as with usual HCI command flow control.
131 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT
132 * state to be cleared. The driver specific event receive routine
133 * will clear that state and with that indicate completion of the
136 err = wait_on_bit_timeout(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT,
137 TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
139 bt_dev_err(hdev, "Execution of wmt command interrupted");
140 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
145 bt_dev_err(hdev, "Execution of wmt command timed out");
146 clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
151 /* Parse and handle the return WMT event */
152 wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data;
153 if (wmt_evt->whdr.op != hdr->op) {
154 bt_dev_err(hdev, "Wrong op received %d expected %d",
155 wmt_evt->whdr.op, hdr->op);
160 switch (wmt_evt->whdr.op) {
161 case BTMTK_WMT_SEMAPHORE:
162 if (wmt_evt->whdr.flag == 2)
163 status = BTMTK_WMT_PATCH_UNDONE;
165 status = BTMTK_WMT_PATCH_DONE;
167 case BTMTK_WMT_FUNC_CTRL:
168 wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
169 if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
170 status = BTMTK_WMT_ON_DONE;
171 else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
172 status = BTMTK_WMT_ON_PROGRESS;
174 status = BTMTK_WMT_ON_UNDONE;
178 if (wmt_params->status)
179 *wmt_params->status = status;
184 kfree_skb(bdev->evt_skb);
185 bdev->evt_skb = NULL;
190 static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
192 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
193 struct hci_event_hdr *hdr = (void *)skb->data;
196 /* When someone waits for the WMT event, the skb is being cloned
197 * and being processed the events from there then.
199 if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) {
200 bdev->evt_skb = skb_clone(skb, GFP_KERNEL);
201 if (!bdev->evt_skb) {
207 err = hci_recv_frame(hdev, skb);
211 if (hdr->evt == HCI_EV_WMT) {
212 if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT,
214 /* Barrier to sync with other CPUs */
215 smp_mb__after_atomic();
216 wake_up_bit(&bdev->tx_state, BTMTKUART_TX_WAIT_VND_EVT);
223 kfree_skb(bdev->evt_skb);
224 bdev->evt_skb = NULL;
230 static const struct h4_recv_pkt mtk_recv_pkts[] = {
231 { H4_RECV_ACL, .recv = hci_recv_frame },
232 { H4_RECV_SCO, .recv = hci_recv_frame },
233 { H4_RECV_EVENT, .recv = btmtkuart_recv_event },
236 static void btmtkuart_tx_work(struct work_struct *work)
238 struct btmtkuart_dev *bdev = container_of(work, struct btmtkuart_dev,
240 struct serdev_device *serdev = bdev->serdev;
241 struct hci_dev *hdev = bdev->hdev;
244 clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
247 struct sk_buff *skb = skb_dequeue(&bdev->txq);
253 len = serdev_device_write_buf(serdev, skb->data,
255 hdev->stat.byte_tx += len;
259 skb_queue_head(&bdev->txq, skb);
263 switch (hci_skb_pkt_type(skb)) {
264 case HCI_COMMAND_PKT:
267 case HCI_ACLDATA_PKT:
270 case HCI_SCODATA_PKT:
278 if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state))
282 clear_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state);
285 static void btmtkuart_tx_wakeup(struct btmtkuart_dev *bdev)
287 if (test_and_set_bit(BTMTKUART_TX_STATE_ACTIVE, &bdev->tx_state))
288 set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
290 schedule_work(&bdev->tx_work);
293 static const unsigned char *
294 mtk_stp_split(struct btmtkuart_dev *bdev, const unsigned char *data, int count,
297 struct mtk_stp_hdr *shdr;
299 /* The cursor is reset when all the data of STP is consumed out */
300 if (!bdev->stp_dlen && bdev->stp_cursor >= 6)
301 bdev->stp_cursor = 0;
303 /* Filling pad until all STP info is obtained */
304 while (bdev->stp_cursor < 6 && count > 0) {
305 bdev->stp_pad[bdev->stp_cursor] = *data;
311 /* Retrieve STP info and have a sanity check */
312 if (!bdev->stp_dlen && bdev->stp_cursor >= 6) {
313 shdr = (struct mtk_stp_hdr *)&bdev->stp_pad[2];
314 bdev->stp_dlen = be16_to_cpu(shdr->dlen) & 0x0fff;
316 /* Resync STP when unexpected data is being read */
317 if (shdr->prefix != 0x80 || bdev->stp_dlen > 2048) {
318 bt_dev_err(bdev->hdev, "stp format unexpect (%d, %d)",
319 shdr->prefix, bdev->stp_dlen);
320 bdev->stp_cursor = 2;
325 /* Directly quit when there's no data found for H4 can process */
329 /* Tranlate to how much the size of data H4 can handle so far */
330 *sz_h4 = min_t(int, count, bdev->stp_dlen);
332 /* Update the remaining size of STP packet */
333 bdev->stp_dlen -= *sz_h4;
335 /* Data points to STP payload which can be handled by H4 */
339 static void btmtkuart_recv(struct hci_dev *hdev, const u8 *data, size_t count)
341 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
342 const unsigned char *p_left = data, *p_h4;
343 int sz_left = count, sz_h4, adv;
346 while (sz_left > 0) {
347 /* The serial data received from MT7622 BT controller is
348 * at all time padded around with the STP header and tailer.
350 * A full STP packet is looking like
351 * -----------------------------------
352 * | STP header | H:4 | STP tailer |
353 * -----------------------------------
354 * but it doesn't guarantee to contain a full H:4 packet which
355 * means that it's possible for multiple STP packets forms a
356 * full H:4 packet that means extra STP header + length doesn't
357 * indicate a full H:4 frame, things can fragment. Whose length
358 * recorded in STP header just shows up the most length the
359 * H:4 engine can handle currently.
362 p_h4 = mtk_stp_split(bdev, p_left, sz_left, &sz_h4);
370 bdev->rx_skb = h4_recv_buf(bdev->hdev, bdev->rx_skb, p_h4,
371 sz_h4, mtk_recv_pkts,
372 ARRAY_SIZE(mtk_recv_pkts));
373 if (IS_ERR(bdev->rx_skb)) {
374 err = PTR_ERR(bdev->rx_skb);
375 bt_dev_err(bdev->hdev,
376 "Frame reassembly failed (%d)", err);
386 static int btmtkuart_receive_buf(struct serdev_device *serdev, const u8 *data,
389 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
391 btmtkuart_recv(bdev->hdev, data, count);
393 bdev->hdev->stat.byte_rx += count;
398 static void btmtkuart_write_wakeup(struct serdev_device *serdev)
400 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
402 btmtkuart_tx_wakeup(bdev);
405 static const struct serdev_device_ops btmtkuart_client_ops = {
406 .receive_buf = btmtkuart_receive_buf,
407 .write_wakeup = btmtkuart_write_wakeup,
410 static int btmtkuart_open(struct hci_dev *hdev)
412 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
416 err = serdev_device_open(bdev->serdev);
418 bt_dev_err(hdev, "Unable to open UART device %s",
419 dev_name(&bdev->serdev->dev));
423 if (btmtkuart_is_standalone(bdev)) {
424 if (bdev->curr_speed != bdev->desired_speed)
425 err = serdev_device_set_baudrate(bdev->serdev,
428 err = serdev_device_set_baudrate(bdev->serdev,
429 bdev->desired_speed);
432 bt_dev_err(hdev, "Unable to set baudrate UART device %s",
433 dev_name(&bdev->serdev->dev));
434 goto err_serdev_close;
437 serdev_device_set_flow_control(bdev->serdev, false);
440 bdev->stp_cursor = 2;
443 dev = &bdev->serdev->dev;
445 /* Enable the power domain and clock the device requires */
446 pm_runtime_enable(dev);
447 err = pm_runtime_resume_and_get(dev);
449 goto err_disable_rpm;
451 err = clk_prepare_enable(bdev->clk);
458 pm_runtime_put_sync(dev);
460 pm_runtime_disable(dev);
462 serdev_device_close(bdev->serdev);
467 static int btmtkuart_close(struct hci_dev *hdev)
469 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
470 struct device *dev = &bdev->serdev->dev;
472 /* Shutdown the clock and power domain the device requires */
473 clk_disable_unprepare(bdev->clk);
474 pm_runtime_put_sync(dev);
475 pm_runtime_disable(dev);
477 serdev_device_close(bdev->serdev);
482 static int btmtkuart_flush(struct hci_dev *hdev)
484 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
486 /* Flush any pending characters */
487 serdev_device_write_flush(bdev->serdev);
488 skb_queue_purge(&bdev->txq);
490 cancel_work_sync(&bdev->tx_work);
492 kfree_skb(bdev->rx_skb);
495 bdev->stp_cursor = 2;
501 static int btmtkuart_func_query(struct hci_dev *hdev)
503 struct btmtk_hci_wmt_params wmt_params;
507 /* Query whether the function is enabled */
508 wmt_params.op = BTMTK_WMT_FUNC_CTRL;
510 wmt_params.dlen = sizeof(param);
511 wmt_params.data = ¶m;
512 wmt_params.status = &status;
514 err = mtk_hci_wmt_sync(hdev, &wmt_params);
516 bt_dev_err(hdev, "Failed to query function status (%d)", err);
523 static int btmtkuart_change_baudrate(struct hci_dev *hdev)
525 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
526 struct btmtk_hci_wmt_params wmt_params;
531 /* Indicate the device to enter the probe state the host is
532 * ready to change a new baudrate.
534 baudrate = cpu_to_le32(bdev->desired_speed);
535 wmt_params.op = BTMTK_WMT_HIF;
538 wmt_params.data = &baudrate;
539 wmt_params.status = NULL;
541 err = mtk_hci_wmt_sync(hdev, &wmt_params);
543 bt_dev_err(hdev, "Failed to device baudrate (%d)", err);
547 err = serdev_device_set_baudrate(bdev->serdev,
548 bdev->desired_speed);
550 bt_dev_err(hdev, "Failed to set up host baudrate (%d)",
555 serdev_device_set_flow_control(bdev->serdev, false);
557 /* Send a dummy byte 0xff to activate the new baudrate */
559 err = serdev_device_write_buf(bdev->serdev, ¶m, sizeof(param));
560 if (err < 0 || err < sizeof(param))
563 serdev_device_wait_until_sent(bdev->serdev, 0);
565 /* Wait some time for the device changing baudrate done */
566 usleep_range(20000, 22000);
568 /* Test the new baudrate */
569 wmt_params.op = BTMTK_WMT_TEST;
572 wmt_params.data = NULL;
573 wmt_params.status = NULL;
575 err = mtk_hci_wmt_sync(hdev, &wmt_params);
577 bt_dev_err(hdev, "Failed to test new baudrate (%d)",
582 bdev->curr_speed = bdev->desired_speed;
587 static int btmtkuart_setup(struct hci_dev *hdev)
589 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
590 struct btmtk_hci_wmt_params wmt_params;
591 ktime_t calltime, delta, rettime;
592 struct btmtk_tci_sleep tci_sleep;
593 unsigned long long duration;
598 calltime = ktime_get();
600 /* Wakeup MCUSYS is required for certain devices before we start to
603 if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) {
604 wmt_params.op = BTMTK_WMT_WAKEUP;
607 wmt_params.data = NULL;
608 wmt_params.status = NULL;
610 err = mtk_hci_wmt_sync(hdev, &wmt_params);
612 bt_dev_err(hdev, "Failed to wakeup the chip (%d)", err);
616 clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
619 if (btmtkuart_is_standalone(bdev))
620 btmtkuart_change_baudrate(hdev);
622 /* Query whether the firmware is already download */
623 wmt_params.op = BTMTK_WMT_SEMAPHORE;
626 wmt_params.data = NULL;
627 wmt_params.status = &status;
629 err = mtk_hci_wmt_sync(hdev, &wmt_params);
631 bt_dev_err(hdev, "Failed to query firmware status (%d)", err);
635 if (status == BTMTK_WMT_PATCH_DONE) {
636 bt_dev_info(hdev, "Firmware already downloaded");
637 goto ignore_setup_fw;
640 /* Setup a firmware which the device definitely requires */
641 err = btmtk_setup_firmware(hdev, bdev->data->fwname, mtk_hci_wmt_sync);
646 /* Query whether the device is already enabled */
647 err = readx_poll_timeout(btmtkuart_func_query, hdev, status,
648 status < 0 || status != BTMTK_WMT_ON_PROGRESS,
650 /* -ETIMEDOUT happens */
654 /* The other errors happen in btusb_mtk_func_query */
658 if (status == BTMTK_WMT_ON_DONE) {
659 bt_dev_info(hdev, "function already on");
663 /* Enable Bluetooth protocol */
664 wmt_params.op = BTMTK_WMT_FUNC_CTRL;
666 wmt_params.dlen = sizeof(param);
667 wmt_params.data = ¶m;
668 wmt_params.status = NULL;
670 err = mtk_hci_wmt_sync(hdev, &wmt_params);
672 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
677 /* Apply the low power environment setup */
678 tci_sleep.mode = 0x5;
679 tci_sleep.duration = cpu_to_le16(0x640);
680 tci_sleep.host_duration = cpu_to_le16(0x640);
681 tci_sleep.host_wakeup_pin = 0;
682 tci_sleep.time_compensation = 0;
684 skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep,
688 bt_dev_err(hdev, "Failed to apply low power setting (%d)", err);
693 rettime = ktime_get();
694 delta = ktime_sub(rettime, calltime);
695 duration = (unsigned long long)ktime_to_ns(delta) >> 10;
697 bt_dev_info(hdev, "Device setup in %llu usecs", duration);
702 static int btmtkuart_shutdown(struct hci_dev *hdev)
704 struct btmtk_hci_wmt_params wmt_params;
708 /* Disable the device */
709 wmt_params.op = BTMTK_WMT_FUNC_CTRL;
711 wmt_params.dlen = sizeof(param);
712 wmt_params.data = ¶m;
713 wmt_params.status = NULL;
715 err = mtk_hci_wmt_sync(hdev, &wmt_params);
717 bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
724 static int btmtkuart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
726 struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
727 struct mtk_stp_hdr *shdr;
728 int err, dlen, type = 0;
730 /* Prepend skb with frame type */
731 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
733 /* Make sure that there is enough rooms for STP header and trailer */
734 if (unlikely(skb_headroom(skb) < sizeof(*shdr)) ||
735 (skb_tailroom(skb) < MTK_STP_TLR_SIZE)) {
736 err = pskb_expand_head(skb, sizeof(*shdr), MTK_STP_TLR_SIZE,
742 /* Add the STP header */
744 shdr = skb_push(skb, sizeof(*shdr));
746 shdr->dlen = cpu_to_be16((dlen & 0x0fff) | (type << 12));
747 shdr->cs = 0; /* MT7622 doesn't care about checksum value */
749 /* Add the STP trailer */
750 skb_put_zero(skb, MTK_STP_TLR_SIZE);
752 skb_queue_tail(&bdev->txq, skb);
754 btmtkuart_tx_wakeup(bdev);
758 static int btmtkuart_parse_dt(struct serdev_device *serdev)
760 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
761 struct device_node *node = serdev->dev.of_node;
765 if (btmtkuart_is_standalone(bdev)) {
766 of_property_read_u32(node, "current-speed", &speed);
768 bdev->desired_speed = speed;
770 bdev->vcc = devm_regulator_get(&serdev->dev, "vcc");
771 if (IS_ERR(bdev->vcc)) {
772 err = PTR_ERR(bdev->vcc);
776 bdev->osc = devm_clk_get_optional(&serdev->dev, "osc");
777 if (IS_ERR(bdev->osc)) {
778 err = PTR_ERR(bdev->osc);
782 bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot",
784 if (IS_ERR(bdev->boot)) {
785 err = PTR_ERR(bdev->boot);
789 bdev->pinctrl = devm_pinctrl_get(&serdev->dev);
790 if (IS_ERR(bdev->pinctrl)) {
791 err = PTR_ERR(bdev->pinctrl);
795 bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl,
797 if (IS_ERR(bdev->pins_boot) && !bdev->boot) {
798 err = PTR_ERR(bdev->pins_boot);
799 dev_err(&serdev->dev,
800 "Should assign RXD to LOW at boot stage\n");
804 bdev->pins_runtime = pinctrl_lookup_state(bdev->pinctrl,
806 if (IS_ERR(bdev->pins_runtime)) {
807 err = PTR_ERR(bdev->pins_runtime);
811 bdev->reset = devm_gpiod_get_optional(&serdev->dev, "reset",
813 if (IS_ERR(bdev->reset)) {
814 err = PTR_ERR(bdev->reset);
817 } else if (btmtkuart_is_builtin_soc(bdev)) {
818 bdev->clk = devm_clk_get(&serdev->dev, "ref");
819 if (IS_ERR(bdev->clk))
820 return PTR_ERR(bdev->clk);
826 static int btmtkuart_probe(struct serdev_device *serdev)
828 struct btmtkuart_dev *bdev;
829 struct hci_dev *hdev;
832 bdev = devm_kzalloc(&serdev->dev, sizeof(*bdev), GFP_KERNEL);
836 bdev->data = of_device_get_match_data(&serdev->dev);
840 bdev->serdev = serdev;
841 serdev_device_set_drvdata(serdev, bdev);
843 serdev_device_set_client_ops(serdev, &btmtkuart_client_ops);
845 err = btmtkuart_parse_dt(serdev);
849 INIT_WORK(&bdev->tx_work, btmtkuart_tx_work);
850 skb_queue_head_init(&bdev->txq);
852 /* Initialize and register HCI device */
853 hdev = hci_alloc_dev();
855 dev_err(&serdev->dev, "Can't allocate HCI device\n");
861 hdev->bus = HCI_UART;
862 hci_set_drvdata(hdev, bdev);
864 hdev->open = btmtkuart_open;
865 hdev->close = btmtkuart_close;
866 hdev->flush = btmtkuart_flush;
867 hdev->setup = btmtkuart_setup;
868 hdev->shutdown = btmtkuart_shutdown;
869 hdev->send = btmtkuart_send_frame;
870 hdev->set_bdaddr = btmtk_set_bdaddr;
871 SET_HCIDEV_DEV(hdev, &serdev->dev);
873 hdev->manufacturer = 70;
874 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
876 if (btmtkuart_is_standalone(bdev)) {
877 err = clk_prepare_enable(bdev->osc);
879 goto err_hci_free_dev;
882 gpiod_set_value_cansleep(bdev->boot, 1);
884 /* Switch to the specific pin state for the booting
887 pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
891 err = regulator_enable(bdev->vcc);
893 goto err_clk_disable_unprepare;
895 /* Reset if the reset-gpios is available otherwise the board
896 * -level design should be guaranteed.
899 gpiod_set_value_cansleep(bdev->reset, 1);
900 usleep_range(1000, 2000);
901 gpiod_set_value_cansleep(bdev->reset, 0);
904 /* Wait some time until device got ready and switch to the pin
905 * mode the device requires for UART transfers.
910 devm_gpiod_put(&serdev->dev, bdev->boot);
912 pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime);
914 /* A standalone device doesn't depends on power domain on SoC,
915 * so mark it as no callbacks.
917 pm_runtime_no_callbacks(&serdev->dev);
919 set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
922 err = hci_register_dev(hdev);
924 dev_err(&serdev->dev, "Can't register HCI device\n");
925 goto err_regulator_disable;
930 err_regulator_disable:
931 if (btmtkuart_is_standalone(bdev))
932 regulator_disable(bdev->vcc);
933 err_clk_disable_unprepare:
934 if (btmtkuart_is_standalone(bdev))
935 clk_disable_unprepare(bdev->osc);
942 static void btmtkuart_remove(struct serdev_device *serdev)
944 struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);
945 struct hci_dev *hdev = bdev->hdev;
947 if (btmtkuart_is_standalone(bdev)) {
948 regulator_disable(bdev->vcc);
949 clk_disable_unprepare(bdev->osc);
952 hci_unregister_dev(hdev);
956 static const struct btmtkuart_data mt7622_data __maybe_unused = {
957 .fwname = FIRMWARE_MT7622,
960 static const struct btmtkuart_data mt7663_data __maybe_unused = {
961 .flags = BTMTKUART_FLAG_STANDALONE_HW,
962 .fwname = FIRMWARE_MT7663,
965 static const struct btmtkuart_data mt7668_data __maybe_unused = {
966 .flags = BTMTKUART_FLAG_STANDALONE_HW,
967 .fwname = FIRMWARE_MT7668,
971 static const struct of_device_id mtk_of_match_table[] = {
972 { .compatible = "mediatek,mt7622-bluetooth", .data = &mt7622_data},
973 { .compatible = "mediatek,mt7663u-bluetooth", .data = &mt7663_data},
974 { .compatible = "mediatek,mt7668u-bluetooth", .data = &mt7668_data},
977 MODULE_DEVICE_TABLE(of, mtk_of_match_table);
980 static struct serdev_device_driver btmtkuart_driver = {
981 .probe = btmtkuart_probe,
982 .remove = btmtkuart_remove,
985 .of_match_table = of_match_ptr(mtk_of_match_table),
989 module_serdev_device_driver(btmtkuart_driver);
991 MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
992 MODULE_DESCRIPTION("MediaTek Bluetooth Serial driver ver " VERSION);
993 MODULE_VERSION(VERSION);
994 MODULE_LICENSE("GPL");