1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Bluetooth HCI UART driver for Intel devices
6 * Copyright (C) 2015 Intel Corporation
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/skbuff.h>
12 #include <linux/firmware.h>
13 #include <linux/module.h>
14 #include <linux/wait.h>
15 #include <linux/tty.h>
16 #include <linux/platform_device.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/acpi.h>
19 #include <linux/interrupt.h>
20 #include <linux/pm_runtime.h>
22 #include <net/bluetooth/bluetooth.h>
23 #include <net/bluetooth/hci_core.h>
28 #define STATE_BOOTLOADER 0
29 #define STATE_DOWNLOADING 1
30 #define STATE_FIRMWARE_LOADED 2
31 #define STATE_FIRMWARE_FAILED 3
32 #define STATE_BOOTING 4
33 #define STATE_LPM_ENABLED 5
34 #define STATE_TX_ACTIVE 6
35 #define STATE_SUSPENDED 7
36 #define STATE_LPM_TRANSACTION 8
38 #define HCI_LPM_WAKE_PKT 0xf0
39 #define HCI_LPM_PKT 0xf1
40 #define HCI_LPM_MAX_SIZE 10
41 #define HCI_LPM_HDR_SIZE HCI_EVENT_HDR_SIZE
43 #define LPM_OP_TX_NOTIFY 0x00
44 #define LPM_OP_SUSPEND_ACK 0x02
45 #define LPM_OP_RESUME_ACK 0x03
47 #define LPM_SUSPEND_DELAY_MS 1000
56 struct list_head list;
57 struct platform_device *pdev;
58 struct gpio_desc *reset;
64 static LIST_HEAD(intel_device_list);
65 static DEFINE_MUTEX(intel_device_list_lock);
68 struct sk_buff *rx_skb;
69 struct sk_buff_head txq;
70 struct work_struct busy_work;
75 static u8 intel_convert_speed(unsigned int speed)
107 static int intel_wait_booting(struct hci_uart *hu)
109 struct intel_data *intel = hu->priv;
112 err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING,
114 msecs_to_jiffies(1000));
117 bt_dev_err(hu->hdev, "Device boot interrupted");
122 bt_dev_err(hu->hdev, "Device boot timeout");
130 static int intel_wait_lpm_transaction(struct hci_uart *hu)
132 struct intel_data *intel = hu->priv;
135 err = wait_on_bit_timeout(&intel->flags, STATE_LPM_TRANSACTION,
137 msecs_to_jiffies(1000));
140 bt_dev_err(hu->hdev, "LPM transaction interrupted");
145 bt_dev_err(hu->hdev, "LPM transaction timeout");
152 static int intel_lpm_suspend(struct hci_uart *hu)
154 static const u8 suspend[] = { 0x01, 0x01, 0x01 };
155 struct intel_data *intel = hu->priv;
158 if (!test_bit(STATE_LPM_ENABLED, &intel->flags) ||
159 test_bit(STATE_SUSPENDED, &intel->flags))
162 if (test_bit(STATE_TX_ACTIVE, &intel->flags))
165 bt_dev_dbg(hu->hdev, "Suspending");
167 skb = bt_skb_alloc(sizeof(suspend), GFP_KERNEL);
169 bt_dev_err(hu->hdev, "Failed to alloc memory for LPM packet");
173 skb_put_data(skb, suspend, sizeof(suspend));
174 hci_skb_pkt_type(skb) = HCI_LPM_PKT;
176 set_bit(STATE_LPM_TRANSACTION, &intel->flags);
178 /* LPM flow is a priority, enqueue packet at list head */
179 skb_queue_head(&intel->txq, skb);
180 hci_uart_tx_wakeup(hu);
182 intel_wait_lpm_transaction(hu);
183 /* Even in case of failure, continue and test the suspended flag */
185 clear_bit(STATE_LPM_TRANSACTION, &intel->flags);
187 if (!test_bit(STATE_SUSPENDED, &intel->flags)) {
188 bt_dev_err(hu->hdev, "Device suspend error");
192 bt_dev_dbg(hu->hdev, "Suspended");
194 hci_uart_set_flow_control(hu, true);
199 static int intel_lpm_resume(struct hci_uart *hu)
201 struct intel_data *intel = hu->priv;
204 if (!test_bit(STATE_LPM_ENABLED, &intel->flags) ||
205 !test_bit(STATE_SUSPENDED, &intel->flags))
208 bt_dev_dbg(hu->hdev, "Resuming");
210 hci_uart_set_flow_control(hu, false);
212 skb = bt_skb_alloc(0, GFP_KERNEL);
214 bt_dev_err(hu->hdev, "Failed to alloc memory for LPM packet");
218 hci_skb_pkt_type(skb) = HCI_LPM_WAKE_PKT;
220 set_bit(STATE_LPM_TRANSACTION, &intel->flags);
222 /* LPM flow is a priority, enqueue packet at list head */
223 skb_queue_head(&intel->txq, skb);
224 hci_uart_tx_wakeup(hu);
226 intel_wait_lpm_transaction(hu);
227 /* Even in case of failure, continue and test the suspended flag */
229 clear_bit(STATE_LPM_TRANSACTION, &intel->flags);
231 if (test_bit(STATE_SUSPENDED, &intel->flags)) {
232 bt_dev_err(hu->hdev, "Device resume error");
236 bt_dev_dbg(hu->hdev, "Resumed");
240 #endif /* CONFIG_PM */
242 static int intel_lpm_host_wake(struct hci_uart *hu)
244 static const u8 lpm_resume_ack[] = { LPM_OP_RESUME_ACK, 0x00 };
245 struct intel_data *intel = hu->priv;
248 hci_uart_set_flow_control(hu, false);
250 clear_bit(STATE_SUSPENDED, &intel->flags);
252 skb = bt_skb_alloc(sizeof(lpm_resume_ack), GFP_KERNEL);
254 bt_dev_err(hu->hdev, "Failed to alloc memory for LPM packet");
258 skb_put_data(skb, lpm_resume_ack, sizeof(lpm_resume_ack));
259 hci_skb_pkt_type(skb) = HCI_LPM_PKT;
261 /* LPM flow is a priority, enqueue packet at list head */
262 skb_queue_head(&intel->txq, skb);
263 hci_uart_tx_wakeup(hu);
265 bt_dev_dbg(hu->hdev, "Resumed by controller");
270 static irqreturn_t intel_irq(int irq, void *dev_id)
272 struct intel_device *idev = dev_id;
274 dev_info(&idev->pdev->dev, "hci_intel irq\n");
276 mutex_lock(&idev->hu_lock);
278 intel_lpm_host_wake(idev->hu);
279 mutex_unlock(&idev->hu_lock);
281 /* Host/Controller are now LPM resumed, trigger a new delayed suspend */
282 pm_runtime_get(&idev->pdev->dev);
283 pm_runtime_mark_last_busy(&idev->pdev->dev);
284 pm_runtime_put_autosuspend(&idev->pdev->dev);
289 static int intel_set_power(struct hci_uart *hu, bool powered)
297 mutex_lock(&intel_device_list_lock);
299 list_for_each(p, &intel_device_list) {
300 struct intel_device *idev = list_entry(p, struct intel_device,
303 /* tty device and pdev device should share the same parent
304 * which is the UART port.
306 if (hu->tty->dev->parent != idev->pdev->dev.parent)
314 BT_INFO("hu %p, Switching compatible pm device (%s) to %u",
315 hu, dev_name(&idev->pdev->dev), powered);
317 gpiod_set_value(idev->reset, powered);
319 /* Provide to idev a hu reference which is used to run LPM
320 * transactions (lpm suspend/resume) from PM callbacks.
321 * hu needs to be protected against concurrent removing during
324 mutex_lock(&idev->hu_lock);
325 idev->hu = powered ? hu : NULL;
326 mutex_unlock(&idev->hu_lock);
331 if (powered && device_can_wakeup(&idev->pdev->dev)) {
332 err = devm_request_threaded_irq(&idev->pdev->dev,
336 "bt-host-wake", idev);
338 BT_ERR("hu %p, unable to allocate irq-%d",
343 device_wakeup_enable(&idev->pdev->dev);
345 pm_runtime_set_active(&idev->pdev->dev);
346 pm_runtime_use_autosuspend(&idev->pdev->dev);
347 pm_runtime_set_autosuspend_delay(&idev->pdev->dev,
348 LPM_SUSPEND_DELAY_MS);
349 pm_runtime_enable(&idev->pdev->dev);
350 } else if (!powered && device_may_wakeup(&idev->pdev->dev)) {
351 devm_free_irq(&idev->pdev->dev, idev->irq, idev);
352 device_wakeup_disable(&idev->pdev->dev);
354 pm_runtime_disable(&idev->pdev->dev);
358 mutex_unlock(&intel_device_list_lock);
363 static void intel_busy_work(struct work_struct *work)
366 struct intel_data *intel = container_of(work, struct intel_data,
369 if (!intel->hu->tty->dev)
372 /* Link is busy, delay the suspend */
373 mutex_lock(&intel_device_list_lock);
374 list_for_each(p, &intel_device_list) {
375 struct intel_device *idev = list_entry(p, struct intel_device,
378 if (intel->hu->tty->dev->parent == idev->pdev->dev.parent) {
379 pm_runtime_get(&idev->pdev->dev);
380 pm_runtime_mark_last_busy(&idev->pdev->dev);
381 pm_runtime_put_autosuspend(&idev->pdev->dev);
385 mutex_unlock(&intel_device_list_lock);
388 static int intel_open(struct hci_uart *hu)
390 struct intel_data *intel;
394 if (!hci_uart_has_flow_control(hu))
397 intel = kzalloc(sizeof(*intel), GFP_KERNEL);
401 skb_queue_head_init(&intel->txq);
402 INIT_WORK(&intel->busy_work, intel_busy_work);
408 if (!intel_set_power(hu, true))
409 set_bit(STATE_BOOTING, &intel->flags);
414 static int intel_close(struct hci_uart *hu)
416 struct intel_data *intel = hu->priv;
420 cancel_work_sync(&intel->busy_work);
422 intel_set_power(hu, false);
424 skb_queue_purge(&intel->txq);
425 kfree_skb(intel->rx_skb);
432 static int intel_flush(struct hci_uart *hu)
434 struct intel_data *intel = hu->priv;
438 skb_queue_purge(&intel->txq);
443 static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
446 struct hci_event_hdr *hdr;
447 struct hci_ev_cmd_complete *evt;
449 skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_KERNEL);
453 hdr = skb_put(skb, sizeof(*hdr));
454 hdr->evt = HCI_EV_CMD_COMPLETE;
455 hdr->plen = sizeof(*evt) + 1;
457 evt = skb_put(skb, sizeof(*evt));
459 evt->opcode = cpu_to_le16(opcode);
461 skb_put_u8(skb, 0x00);
463 hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
465 return hci_recv_frame(hdev, skb);
468 static int intel_set_baudrate(struct hci_uart *hu, unsigned int speed)
470 struct intel_data *intel = hu->priv;
471 struct hci_dev *hdev = hu->hdev;
472 u8 speed_cmd[] = { 0x06, 0xfc, 0x01, 0x00 };
476 /* This can be the first command sent to the chip, check
477 * that the controller is ready.
479 err = intel_wait_booting(hu);
481 clear_bit(STATE_BOOTING, &intel->flags);
483 /* In case of timeout, try to continue anyway */
484 if (err && err != -ETIMEDOUT)
487 bt_dev_info(hdev, "Change controller speed to %d", speed);
489 speed_cmd[3] = intel_convert_speed(speed);
490 if (speed_cmd[3] == 0xff) {
491 bt_dev_err(hdev, "Unsupported speed");
495 /* Device will not accept speed change if Intel version has not been
496 * previously requested.
498 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
500 bt_dev_err(hdev, "Reading Intel version information failed (%ld)",
506 skb = bt_skb_alloc(sizeof(speed_cmd), GFP_KERNEL);
508 bt_dev_err(hdev, "Failed to alloc memory for baudrate packet");
512 skb_put_data(skb, speed_cmd, sizeof(speed_cmd));
513 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
515 hci_uart_set_flow_control(hu, true);
517 skb_queue_tail(&intel->txq, skb);
518 hci_uart_tx_wakeup(hu);
520 /* wait 100ms to change baudrate on controller side */
523 hci_uart_set_baudrate(hu, speed);
524 hci_uart_set_flow_control(hu, false);
529 static int intel_setup(struct hci_uart *hu)
531 struct intel_data *intel = hu->priv;
532 struct hci_dev *hdev = hu->hdev;
534 struct intel_version ver;
535 struct intel_boot_params params;
537 const struct firmware *fw;
540 ktime_t calltime, delta, rettime;
541 unsigned long long duration;
542 unsigned int init_speed, oper_speed;
543 int speed_change = 0;
546 bt_dev_dbg(hdev, "start intel_setup");
548 hu->hdev->set_diag = btintel_set_diag;
549 hu->hdev->set_bdaddr = btintel_set_bdaddr;
551 /* Set the default boot parameter to 0x0 and it is updated to
552 * SKU specific boot parameter after reading Intel_Write_Boot_Params
553 * command while downloading the firmware.
555 boot_param = 0x00000000;
557 calltime = ktime_get();
560 init_speed = hu->init_speed;
562 init_speed = hu->proto->init_speed;
565 oper_speed = hu->oper_speed;
567 oper_speed = hu->proto->oper_speed;
569 if (oper_speed && init_speed && oper_speed != init_speed)
572 /* Check that the controller is ready */
573 err = intel_wait_booting(hu);
575 clear_bit(STATE_BOOTING, &intel->flags);
577 /* In case of timeout, try to continue anyway */
578 if (err && err != -ETIMEDOUT)
581 set_bit(STATE_BOOTLOADER, &intel->flags);
583 /* Read the Intel version information to determine if the device
584 * is in bootloader mode or if it already has operational firmware
587 err = btintel_read_version(hdev, &ver);
591 /* The hardware platform number has a fixed value of 0x37 and
592 * for now only accept this single value.
594 if (ver.hw_platform != 0x37) {
595 bt_dev_err(hdev, "Unsupported Intel hardware platform (%u)",
600 /* Check for supported iBT hardware variants of this firmware
603 * This check has been put in place to ensure correct forward
604 * compatibility options when newer hardware variants come along.
606 switch (ver.hw_variant) {
612 bt_dev_err(hdev, "Unsupported Intel hardware variant (%u)",
617 btintel_version_info(hdev, &ver);
619 /* The firmware variant determines if the device is in bootloader
620 * mode or is running operational firmware. The value 0x06 identifies
621 * the bootloader and the value 0x23 identifies the operational
624 * When the operational firmware is already present, then only
625 * the check for valid Bluetooth device address is needed. This
626 * determines if the device will be added as configured or
627 * unconfigured controller.
629 * It is not possible to use the Secure Boot Parameters in this
630 * case since that command is only available in bootloader mode.
632 if (ver.fw_variant == 0x23) {
633 clear_bit(STATE_BOOTLOADER, &intel->flags);
634 btintel_check_bdaddr(hdev);
638 /* If the device is not in bootloader mode, then the only possible
639 * choice is to return an error and abort the device initialization.
641 if (ver.fw_variant != 0x06) {
642 bt_dev_err(hdev, "Unsupported Intel firmware variant (%u)",
647 /* Read the secure boot parameters to identify the operating
648 * details of the bootloader.
650 err = btintel_read_boot_params(hdev, ¶ms);
654 /* It is required that every single firmware fragment is acknowledged
655 * with a command complete event. If the boot parameters indicate
656 * that this bootloader does not send them, then abort the setup.
658 if (params.limited_cce != 0x00) {
659 bt_dev_err(hdev, "Unsupported Intel firmware loading method (%u)",
664 /* If the OTP has no valid Bluetooth device address, then there will
665 * also be no valid address for the operational firmware.
667 if (!bacmp(¶ms.otp_bdaddr, BDADDR_ANY)) {
668 bt_dev_info(hdev, "No device address configured");
669 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
672 /* With this Intel bootloader only the hardware variant and device
673 * revision information are used to select the right firmware for SfP
676 * The firmware filename is ibt-<hw_variant>-<dev_revid>.sfi.
678 * Currently the supported hardware variants are:
679 * 11 (0x0b) for iBT 3.0 (LnP/SfP)
680 * 12 (0x0c) for iBT 3.5 (WsP)
682 * For ThP/JfP and for future SKU's, the FW name varies based on HW
683 * variant, HW revision and FW revision, as these are dependent on CNVi
684 * and RF Combination.
686 * 18 (0x12) for iBT3.5 (ThP/JfP)
688 * The firmware file name for these will be
689 * ibt-<hw_variant>-<hw_revision>-<fw_revision>.sfi.
692 switch (ver.hw_variant) {
695 snprintf(fwname, sizeof(fwname), "intel/ibt-%u-%u.sfi",
696 le16_to_cpu(ver.hw_variant),
697 le16_to_cpu(params.dev_revid));
700 snprintf(fwname, sizeof(fwname), "intel/ibt-%u-%u-%u.sfi",
701 le16_to_cpu(ver.hw_variant),
702 le16_to_cpu(ver.hw_revision),
703 le16_to_cpu(ver.fw_revision));
706 bt_dev_err(hdev, "Unsupported Intel hardware variant (%u)",
711 err = request_firmware(&fw, fwname, &hdev->dev);
713 bt_dev_err(hdev, "Failed to load Intel firmware file (%d)",
718 bt_dev_info(hdev, "Found device firmware: %s", fwname);
720 /* Save the DDC file name for later */
721 switch (ver.hw_variant) {
724 snprintf(fwname, sizeof(fwname), "intel/ibt-%u-%u.ddc",
725 le16_to_cpu(ver.hw_variant),
726 le16_to_cpu(params.dev_revid));
729 snprintf(fwname, sizeof(fwname), "intel/ibt-%u-%u-%u.ddc",
730 le16_to_cpu(ver.hw_variant),
731 le16_to_cpu(ver.hw_revision),
732 le16_to_cpu(ver.fw_revision));
735 bt_dev_err(hdev, "Unsupported Intel hardware variant (%u)",
740 if (fw->size < 644) {
741 bt_dev_err(hdev, "Invalid size of firmware file (%zu)",
747 set_bit(STATE_DOWNLOADING, &intel->flags);
749 /* Start firmware downloading and get boot parameter */
750 err = btintel_download_firmware(hdev, fw, &boot_param);
754 set_bit(STATE_FIRMWARE_LOADED, &intel->flags);
756 bt_dev_info(hdev, "Waiting for firmware download to complete");
758 /* Before switching the device into operational mode and with that
759 * booting the loaded firmware, wait for the bootloader notification
760 * that all fragments have been successfully received.
762 * When the event processing receives the notification, then the
763 * STATE_DOWNLOADING flag will be cleared.
765 * The firmware loading should not take longer than 5 seconds
766 * and thus just timeout if that happens and fail the setup
769 err = wait_on_bit_timeout(&intel->flags, STATE_DOWNLOADING,
771 msecs_to_jiffies(5000));
773 bt_dev_err(hdev, "Firmware loading interrupted");
779 bt_dev_err(hdev, "Firmware loading timeout");
784 if (test_bit(STATE_FIRMWARE_FAILED, &intel->flags)) {
785 bt_dev_err(hdev, "Firmware loading failed");
790 rettime = ktime_get();
791 delta = ktime_sub(rettime, calltime);
792 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
794 bt_dev_info(hdev, "Firmware loaded in %llu usecs", duration);
797 release_firmware(fw);
802 /* We need to restore the default speed before Intel reset */
804 err = intel_set_baudrate(hu, init_speed);
809 calltime = ktime_get();
811 set_bit(STATE_BOOTING, &intel->flags);
813 err = btintel_send_intel_reset(hdev, boot_param);
817 /* The bootloader will not indicate when the device is ready. This
818 * is done by the operational firmware sending bootup notification.
820 * Booting into operational firmware should not take longer than
821 * 1 second. However if that happens, then just fail the setup
822 * since something went wrong.
824 bt_dev_info(hdev, "Waiting for device to boot");
826 err = intel_wait_booting(hu);
830 clear_bit(STATE_BOOTING, &intel->flags);
832 rettime = ktime_get();
833 delta = ktime_sub(rettime, calltime);
834 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
836 bt_dev_info(hdev, "Device booted in %llu usecs", duration);
838 /* Enable LPM if matching pdev with wakeup enabled, set TX active
839 * until further LPM TX notification.
841 mutex_lock(&intel_device_list_lock);
842 list_for_each(p, &intel_device_list) {
843 struct intel_device *dev = list_entry(p, struct intel_device,
847 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
848 if (device_may_wakeup(&dev->pdev->dev)) {
849 set_bit(STATE_LPM_ENABLED, &intel->flags);
850 set_bit(STATE_TX_ACTIVE, &intel->flags);
855 mutex_unlock(&intel_device_list_lock);
857 /* Ignore errors, device can work without DDC parameters */
858 btintel_load_ddc_config(hdev, fwname);
860 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_CMD_TIMEOUT);
866 err = intel_set_baudrate(hu, oper_speed);
871 bt_dev_info(hdev, "Setup complete");
873 clear_bit(STATE_BOOTLOADER, &intel->flags);
878 static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
880 struct hci_uart *hu = hci_get_drvdata(hdev);
881 struct intel_data *intel = hu->priv;
882 struct hci_event_hdr *hdr;
884 if (!test_bit(STATE_BOOTLOADER, &intel->flags) &&
885 !test_bit(STATE_BOOTING, &intel->flags))
888 hdr = (void *)skb->data;
890 /* When the firmware loading completes the device sends
891 * out a vendor specific event indicating the result of
892 * the firmware loading.
894 if (skb->len == 7 && hdr->evt == 0xff && hdr->plen == 0x05 &&
895 skb->data[2] == 0x06) {
896 if (skb->data[3] != 0x00)
897 set_bit(STATE_FIRMWARE_FAILED, &intel->flags);
899 if (test_and_clear_bit(STATE_DOWNLOADING, &intel->flags) &&
900 test_bit(STATE_FIRMWARE_LOADED, &intel->flags))
901 wake_up_bit(&intel->flags, STATE_DOWNLOADING);
903 /* When switching to the operational firmware the device
904 * sends a vendor specific event indicating that the bootup
907 } else if (skb->len == 9 && hdr->evt == 0xff && hdr->plen == 0x07 &&
908 skb->data[2] == 0x02) {
909 if (test_and_clear_bit(STATE_BOOTING, &intel->flags))
910 wake_up_bit(&intel->flags, STATE_BOOTING);
913 return hci_recv_frame(hdev, skb);
916 static void intel_recv_lpm_notify(struct hci_dev *hdev, int value)
918 struct hci_uart *hu = hci_get_drvdata(hdev);
919 struct intel_data *intel = hu->priv;
921 bt_dev_dbg(hdev, "TX idle notification (%d)", value);
924 set_bit(STATE_TX_ACTIVE, &intel->flags);
925 schedule_work(&intel->busy_work);
927 clear_bit(STATE_TX_ACTIVE, &intel->flags);
931 static int intel_recv_lpm(struct hci_dev *hdev, struct sk_buff *skb)
933 struct hci_lpm_pkt *lpm = (void *)skb->data;
934 struct hci_uart *hu = hci_get_drvdata(hdev);
935 struct intel_data *intel = hu->priv;
937 switch (lpm->opcode) {
938 case LPM_OP_TX_NOTIFY:
940 bt_dev_err(hu->hdev, "Invalid LPM notification packet");
943 intel_recv_lpm_notify(hdev, lpm->data[0]);
945 case LPM_OP_SUSPEND_ACK:
946 set_bit(STATE_SUSPENDED, &intel->flags);
947 if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags))
948 wake_up_bit(&intel->flags, STATE_LPM_TRANSACTION);
950 case LPM_OP_RESUME_ACK:
951 clear_bit(STATE_SUSPENDED, &intel->flags);
952 if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags))
953 wake_up_bit(&intel->flags, STATE_LPM_TRANSACTION);
956 bt_dev_err(hdev, "Unknown LPM opcode (%02x)", lpm->opcode);
965 #define INTEL_RECV_LPM \
966 .type = HCI_LPM_PKT, \
967 .hlen = HCI_LPM_HDR_SIZE, \
970 .maxlen = HCI_LPM_MAX_SIZE
972 static const struct h4_recv_pkt intel_recv_pkts[] = {
973 { H4_RECV_ACL, .recv = hci_recv_frame },
974 { H4_RECV_SCO, .recv = hci_recv_frame },
975 { H4_RECV_EVENT, .recv = intel_recv_event },
976 { INTEL_RECV_LPM, .recv = intel_recv_lpm },
979 static int intel_recv(struct hci_uart *hu, const void *data, int count)
981 struct intel_data *intel = hu->priv;
983 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
986 intel->rx_skb = h4_recv_buf(hu->hdev, intel->rx_skb, data, count,
988 ARRAY_SIZE(intel_recv_pkts));
989 if (IS_ERR(intel->rx_skb)) {
990 int err = PTR_ERR(intel->rx_skb);
991 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
992 intel->rx_skb = NULL;
999 static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
1001 struct intel_data *intel = hu->priv;
1002 struct list_head *p;
1004 BT_DBG("hu %p skb %p", hu, skb);
1009 /* Be sure our controller is resumed and potential LPM transaction
1010 * completed before enqueuing any packet.
1012 mutex_lock(&intel_device_list_lock);
1013 list_for_each(p, &intel_device_list) {
1014 struct intel_device *idev = list_entry(p, struct intel_device,
1017 if (hu->tty->dev->parent == idev->pdev->dev.parent) {
1018 pm_runtime_get_sync(&idev->pdev->dev);
1019 pm_runtime_mark_last_busy(&idev->pdev->dev);
1020 pm_runtime_put_autosuspend(&idev->pdev->dev);
1024 mutex_unlock(&intel_device_list_lock);
1026 skb_queue_tail(&intel->txq, skb);
1031 static struct sk_buff *intel_dequeue(struct hci_uart *hu)
1033 struct intel_data *intel = hu->priv;
1034 struct sk_buff *skb;
1036 skb = skb_dequeue(&intel->txq);
1040 if (test_bit(STATE_BOOTLOADER, &intel->flags) &&
1041 (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT)) {
1042 struct hci_command_hdr *cmd = (void *)skb->data;
1043 __u16 opcode = le16_to_cpu(cmd->opcode);
1045 /* When the 0xfc01 command is issued to boot into
1046 * the operational firmware, it will actually not
1047 * send a command complete event. To keep the flow
1048 * control working inject that event here.
1050 if (opcode == 0xfc01)
1051 inject_cmd_complete(hu->hdev, opcode);
1054 /* Prepend skb with frame type */
1055 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
1060 static const struct hci_uart_proto intel_proto = {
1061 .id = HCI_UART_INTEL,
1064 .init_speed = 115200,
1065 .oper_speed = 3000000,
1067 .close = intel_close,
1068 .flush = intel_flush,
1069 .setup = intel_setup,
1070 .set_baudrate = intel_set_baudrate,
1072 .enqueue = intel_enqueue,
1073 .dequeue = intel_dequeue,
1077 static const struct acpi_device_id intel_acpi_match[] = {
1081 MODULE_DEVICE_TABLE(acpi, intel_acpi_match);
1085 static int intel_suspend_device(struct device *dev)
1087 struct intel_device *idev = dev_get_drvdata(dev);
1089 mutex_lock(&idev->hu_lock);
1091 intel_lpm_suspend(idev->hu);
1092 mutex_unlock(&idev->hu_lock);
1097 static int intel_resume_device(struct device *dev)
1099 struct intel_device *idev = dev_get_drvdata(dev);
1101 mutex_lock(&idev->hu_lock);
1103 intel_lpm_resume(idev->hu);
1104 mutex_unlock(&idev->hu_lock);
1110 #ifdef CONFIG_PM_SLEEP
1111 static int intel_suspend(struct device *dev)
1113 struct intel_device *idev = dev_get_drvdata(dev);
1115 if (device_may_wakeup(dev))
1116 enable_irq_wake(idev->irq);
1118 return intel_suspend_device(dev);
1121 static int intel_resume(struct device *dev)
1123 struct intel_device *idev = dev_get_drvdata(dev);
1125 if (device_may_wakeup(dev))
1126 disable_irq_wake(idev->irq);
1128 return intel_resume_device(dev);
1132 static const struct dev_pm_ops intel_pm_ops = {
1133 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
1134 SET_RUNTIME_PM_OPS(intel_suspend_device, intel_resume_device, NULL)
1137 static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
1138 static const struct acpi_gpio_params host_wake_gpios = { 1, 0, false };
1140 static const struct acpi_gpio_mapping acpi_hci_intel_gpios[] = {
1141 { "reset-gpios", &reset_gpios, 1 },
1142 { "host-wake-gpios", &host_wake_gpios, 1 },
1146 static int intel_probe(struct platform_device *pdev)
1148 struct intel_device *idev;
1151 idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL);
1155 mutex_init(&idev->hu_lock);
1159 ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, acpi_hci_intel_gpios);
1161 dev_dbg(&pdev->dev, "Unable to add GPIO mapping table\n");
1163 idev->reset = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
1164 if (IS_ERR(idev->reset)) {
1165 dev_err(&pdev->dev, "Unable to retrieve gpio\n");
1166 return PTR_ERR(idev->reset);
1169 idev->irq = platform_get_irq(pdev, 0);
1170 if (idev->irq < 0) {
1171 struct gpio_desc *host_wake;
1173 dev_err(&pdev->dev, "No IRQ, falling back to gpio-irq\n");
1175 host_wake = devm_gpiod_get(&pdev->dev, "host-wake", GPIOD_IN);
1176 if (IS_ERR(host_wake)) {
1177 dev_err(&pdev->dev, "Unable to retrieve IRQ\n");
1181 idev->irq = gpiod_to_irq(host_wake);
1182 if (idev->irq < 0) {
1183 dev_err(&pdev->dev, "No corresponding irq for gpio\n");
1188 /* Only enable wake-up/irq when controller is powered */
1189 device_set_wakeup_capable(&pdev->dev, true);
1190 device_wakeup_disable(&pdev->dev);
1193 platform_set_drvdata(pdev, idev);
1195 /* Place this instance on the device list */
1196 mutex_lock(&intel_device_list_lock);
1197 list_add_tail(&idev->list, &intel_device_list);
1198 mutex_unlock(&intel_device_list_lock);
1200 dev_info(&pdev->dev, "registered, gpio(%d)/irq(%d).\n",
1201 desc_to_gpio(idev->reset), idev->irq);
1206 static int intel_remove(struct platform_device *pdev)
1208 struct intel_device *idev = platform_get_drvdata(pdev);
1210 device_wakeup_disable(&pdev->dev);
1212 mutex_lock(&intel_device_list_lock);
1213 list_del(&idev->list);
1214 mutex_unlock(&intel_device_list_lock);
1216 dev_info(&pdev->dev, "unregistered.\n");
1221 static struct platform_driver intel_driver = {
1222 .probe = intel_probe,
1223 .remove = intel_remove,
1225 .name = "hci_intel",
1226 .acpi_match_table = ACPI_PTR(intel_acpi_match),
1227 .pm = &intel_pm_ops,
1231 int __init intel_init(void)
1233 platform_driver_register(&intel_driver);
1235 return hci_uart_register_proto(&intel_proto);
1238 int __exit intel_deinit(void)
1240 platform_driver_unregister(&intel_driver);
1242 return hci_uart_unregister_proto(&intel_proto);