3 * Bluetooth HCI UART driver for Intel devices
5 * Copyright (C) 2015 Intel Corporation
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/skbuff.h>
27 #include <linux/firmware.h>
28 #include <linux/module.h>
29 #include <linux/wait.h>
30 #include <linux/tty.h>
31 #include <linux/platform_device.h>
32 #include <linux/gpio/consumer.h>
33 #include <linux/acpi.h>
34 #include <linux/interrupt.h>
35 #include <linux/pm_runtime.h>
37 #include <net/bluetooth/bluetooth.h>
38 #include <net/bluetooth/hci_core.h>
43 #define STATE_BOOTLOADER 0
44 #define STATE_DOWNLOADING 1
45 #define STATE_FIRMWARE_LOADED 2
46 #define STATE_FIRMWARE_FAILED 3
47 #define STATE_BOOTING 4
48 #define STATE_LPM_ENABLED 5
49 #define STATE_TX_ACTIVE 6
50 #define STATE_SUSPENDED 7
51 #define STATE_LPM_TRANSACTION 8
53 #define HCI_LPM_WAKE_PKT 0xf0
54 #define HCI_LPM_PKT 0xf1
55 #define HCI_LPM_MAX_SIZE 10
56 #define HCI_LPM_HDR_SIZE HCI_EVENT_HDR_SIZE
58 #define LPM_OP_TX_NOTIFY 0x00
59 #define LPM_OP_SUSPEND_ACK 0x02
60 #define LPM_OP_RESUME_ACK 0x03
62 #define LPM_SUSPEND_DELAY_MS 1000
71 struct list_head list;
72 struct platform_device *pdev;
73 struct gpio_desc *reset;
79 static LIST_HEAD(intel_device_list);
80 static DEFINE_MUTEX(intel_device_list_lock);
83 struct sk_buff *rx_skb;
84 struct sk_buff_head txq;
85 struct work_struct busy_work;
90 static u8 intel_convert_speed(unsigned int speed)
122 static int intel_wait_booting(struct hci_uart *hu)
124 struct intel_data *intel = hu->priv;
127 err = wait_on_bit_timeout(&intel->flags, STATE_BOOTING,
129 msecs_to_jiffies(1000));
132 bt_dev_err(hu->hdev, "Device boot interrupted");
137 bt_dev_err(hu->hdev, "Device boot timeout");
145 static int intel_wait_lpm_transaction(struct hci_uart *hu)
147 struct intel_data *intel = hu->priv;
150 err = wait_on_bit_timeout(&intel->flags, STATE_LPM_TRANSACTION,
152 msecs_to_jiffies(1000));
155 bt_dev_err(hu->hdev, "LPM transaction interrupted");
160 bt_dev_err(hu->hdev, "LPM transaction timeout");
167 static int intel_lpm_suspend(struct hci_uart *hu)
169 static const u8 suspend[] = { 0x01, 0x01, 0x01 };
170 struct intel_data *intel = hu->priv;
173 if (!test_bit(STATE_LPM_ENABLED, &intel->flags) ||
174 test_bit(STATE_SUSPENDED, &intel->flags))
177 if (test_bit(STATE_TX_ACTIVE, &intel->flags))
180 bt_dev_dbg(hu->hdev, "Suspending");
182 skb = bt_skb_alloc(sizeof(suspend), GFP_KERNEL);
184 bt_dev_err(hu->hdev, "Failed to alloc memory for LPM packet");
188 memcpy(skb_put(skb, sizeof(suspend)), suspend, sizeof(suspend));
189 hci_skb_pkt_type(skb) = HCI_LPM_PKT;
191 set_bit(STATE_LPM_TRANSACTION, &intel->flags);
193 /* LPM flow is a priority, enqueue packet at list head */
194 skb_queue_head(&intel->txq, skb);
195 hci_uart_tx_wakeup(hu);
197 intel_wait_lpm_transaction(hu);
198 /* Even in case of failure, continue and test the suspended flag */
200 clear_bit(STATE_LPM_TRANSACTION, &intel->flags);
202 if (!test_bit(STATE_SUSPENDED, &intel->flags)) {
203 bt_dev_err(hu->hdev, "Device suspend error");
207 bt_dev_dbg(hu->hdev, "Suspended");
209 hci_uart_set_flow_control(hu, true);
214 static int intel_lpm_resume(struct hci_uart *hu)
216 struct intel_data *intel = hu->priv;
219 if (!test_bit(STATE_LPM_ENABLED, &intel->flags) ||
220 !test_bit(STATE_SUSPENDED, &intel->flags))
223 bt_dev_dbg(hu->hdev, "Resuming");
225 hci_uart_set_flow_control(hu, false);
227 skb = bt_skb_alloc(0, GFP_KERNEL);
229 bt_dev_err(hu->hdev, "Failed to alloc memory for LPM packet");
233 hci_skb_pkt_type(skb) = HCI_LPM_WAKE_PKT;
235 set_bit(STATE_LPM_TRANSACTION, &intel->flags);
237 /* LPM flow is a priority, enqueue packet at list head */
238 skb_queue_head(&intel->txq, skb);
239 hci_uart_tx_wakeup(hu);
241 intel_wait_lpm_transaction(hu);
242 /* Even in case of failure, continue and test the suspended flag */
244 clear_bit(STATE_LPM_TRANSACTION, &intel->flags);
246 if (test_bit(STATE_SUSPENDED, &intel->flags)) {
247 bt_dev_err(hu->hdev, "Device resume error");
251 bt_dev_dbg(hu->hdev, "Resumed");
255 #endif /* CONFIG_PM */
257 static int intel_lpm_host_wake(struct hci_uart *hu)
259 static const u8 lpm_resume_ack[] = { LPM_OP_RESUME_ACK, 0x00 };
260 struct intel_data *intel = hu->priv;
263 hci_uart_set_flow_control(hu, false);
265 clear_bit(STATE_SUSPENDED, &intel->flags);
267 skb = bt_skb_alloc(sizeof(lpm_resume_ack), GFP_KERNEL);
269 bt_dev_err(hu->hdev, "Failed to alloc memory for LPM packet");
273 memcpy(skb_put(skb, sizeof(lpm_resume_ack)), lpm_resume_ack,
274 sizeof(lpm_resume_ack));
275 hci_skb_pkt_type(skb) = HCI_LPM_PKT;
277 /* LPM flow is a priority, enqueue packet at list head */
278 skb_queue_head(&intel->txq, skb);
279 hci_uart_tx_wakeup(hu);
281 bt_dev_dbg(hu->hdev, "Resumed by controller");
286 static irqreturn_t intel_irq(int irq, void *dev_id)
288 struct intel_device *idev = dev_id;
290 dev_info(&idev->pdev->dev, "hci_intel irq\n");
292 mutex_lock(&idev->hu_lock);
294 intel_lpm_host_wake(idev->hu);
295 mutex_unlock(&idev->hu_lock);
297 /* Host/Controller are now LPM resumed, trigger a new delayed suspend */
298 pm_runtime_get(&idev->pdev->dev);
299 pm_runtime_mark_last_busy(&idev->pdev->dev);
300 pm_runtime_put_autosuspend(&idev->pdev->dev);
305 static int intel_set_power(struct hci_uart *hu, bool powered)
313 mutex_lock(&intel_device_list_lock);
315 list_for_each(p, &intel_device_list) {
316 struct intel_device *idev = list_entry(p, struct intel_device,
319 /* tty device and pdev device should share the same parent
320 * which is the UART port.
322 if (hu->tty->dev->parent != idev->pdev->dev.parent)
330 BT_INFO("hu %p, Switching compatible pm device (%s) to %u",
331 hu, dev_name(&idev->pdev->dev), powered);
333 gpiod_set_value(idev->reset, powered);
335 /* Provide to idev a hu reference which is used to run LPM
336 * transactions (lpm suspend/resume) from PM callbacks.
337 * hu needs to be protected against concurrent removing during
340 mutex_lock(&idev->hu_lock);
341 idev->hu = powered ? hu : NULL;
342 mutex_unlock(&idev->hu_lock);
347 if (powered && device_can_wakeup(&idev->pdev->dev)) {
348 err = devm_request_threaded_irq(&idev->pdev->dev,
352 "bt-host-wake", idev);
354 BT_ERR("hu %p, unable to allocate irq-%d",
359 device_wakeup_enable(&idev->pdev->dev);
361 pm_runtime_set_active(&idev->pdev->dev);
362 pm_runtime_use_autosuspend(&idev->pdev->dev);
363 pm_runtime_set_autosuspend_delay(&idev->pdev->dev,
364 LPM_SUSPEND_DELAY_MS);
365 pm_runtime_enable(&idev->pdev->dev);
366 } else if (!powered && device_may_wakeup(&idev->pdev->dev)) {
367 devm_free_irq(&idev->pdev->dev, idev->irq, idev);
368 device_wakeup_disable(&idev->pdev->dev);
370 pm_runtime_disable(&idev->pdev->dev);
374 mutex_unlock(&intel_device_list_lock);
379 static void intel_busy_work(struct work_struct *work)
382 struct intel_data *intel = container_of(work, struct intel_data,
385 if (!intel->hu->tty->dev)
388 /* Link is busy, delay the suspend */
389 mutex_lock(&intel_device_list_lock);
390 list_for_each(p, &intel_device_list) {
391 struct intel_device *idev = list_entry(p, struct intel_device,
394 if (intel->hu->tty->dev->parent == idev->pdev->dev.parent) {
395 pm_runtime_get(&idev->pdev->dev);
396 pm_runtime_mark_last_busy(&idev->pdev->dev);
397 pm_runtime_put_autosuspend(&idev->pdev->dev);
401 mutex_unlock(&intel_device_list_lock);
404 static int intel_open(struct hci_uart *hu)
406 struct intel_data *intel;
410 if (!hci_uart_has_flow_control(hu))
413 intel = kzalloc(sizeof(*intel), GFP_KERNEL);
417 skb_queue_head_init(&intel->txq);
418 INIT_WORK(&intel->busy_work, intel_busy_work);
424 if (!intel_set_power(hu, true))
425 set_bit(STATE_BOOTING, &intel->flags);
430 static int intel_close(struct hci_uart *hu)
432 struct intel_data *intel = hu->priv;
436 cancel_work_sync(&intel->busy_work);
438 intel_set_power(hu, false);
440 skb_queue_purge(&intel->txq);
441 kfree_skb(intel->rx_skb);
448 static int intel_flush(struct hci_uart *hu)
450 struct intel_data *intel = hu->priv;
454 skb_queue_purge(&intel->txq);
459 static int inject_cmd_complete(struct hci_dev *hdev, __u16 opcode)
462 struct hci_event_hdr *hdr;
463 struct hci_ev_cmd_complete *evt;
465 skb = bt_skb_alloc(sizeof(*hdr) + sizeof(*evt) + 1, GFP_ATOMIC);
469 hdr = (struct hci_event_hdr *)skb_put(skb, sizeof(*hdr));
470 hdr->evt = HCI_EV_CMD_COMPLETE;
471 hdr->plen = sizeof(*evt) + 1;
473 evt = (struct hci_ev_cmd_complete *)skb_put(skb, sizeof(*evt));
475 evt->opcode = cpu_to_le16(opcode);
477 *skb_put(skb, 1) = 0x00;
479 hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
481 return hci_recv_frame(hdev, skb);
484 static int intel_set_baudrate(struct hci_uart *hu, unsigned int speed)
486 struct intel_data *intel = hu->priv;
487 struct hci_dev *hdev = hu->hdev;
488 u8 speed_cmd[] = { 0x06, 0xfc, 0x01, 0x00 };
492 /* This can be the first command sent to the chip, check
493 * that the controller is ready.
495 err = intel_wait_booting(hu);
497 clear_bit(STATE_BOOTING, &intel->flags);
499 /* In case of timeout, try to continue anyway */
500 if (err && err != -ETIMEDOUT)
503 bt_dev_info(hdev, "Change controller speed to %d", speed);
505 speed_cmd[3] = intel_convert_speed(speed);
506 if (speed_cmd[3] == 0xff) {
507 bt_dev_err(hdev, "Unsupported speed");
511 /* Device will not accept speed change if Intel version has not been
512 * previously requested.
514 skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
516 bt_dev_err(hdev, "Reading Intel version information failed (%ld)",
522 skb = bt_skb_alloc(sizeof(speed_cmd), GFP_KERNEL);
524 bt_dev_err(hdev, "Failed to alloc memory for baudrate packet");
528 memcpy(skb_put(skb, sizeof(speed_cmd)), speed_cmd, sizeof(speed_cmd));
529 hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
531 hci_uart_set_flow_control(hu, true);
533 skb_queue_tail(&intel->txq, skb);
534 hci_uart_tx_wakeup(hu);
536 /* wait 100ms to change baudrate on controller side */
539 hci_uart_set_baudrate(hu, speed);
540 hci_uart_set_flow_control(hu, false);
545 static int intel_setup(struct hci_uart *hu)
547 static const u8 reset_param[] = { 0x00, 0x01, 0x00, 0x01,
548 0x00, 0x08, 0x04, 0x00 };
549 struct intel_data *intel = hu->priv;
550 struct hci_dev *hdev = hu->hdev;
552 struct intel_version ver;
553 struct intel_boot_params *params;
555 const struct firmware *fw;
559 ktime_t calltime, delta, rettime;
560 unsigned long long duration;
561 unsigned int init_speed, oper_speed;
562 int speed_change = 0;
565 bt_dev_dbg(hdev, "start intel_setup");
567 hu->hdev->set_diag = btintel_set_diag;
568 hu->hdev->set_bdaddr = btintel_set_bdaddr;
570 calltime = ktime_get();
573 init_speed = hu->init_speed;
575 init_speed = hu->proto->init_speed;
578 oper_speed = hu->oper_speed;
580 oper_speed = hu->proto->oper_speed;
582 if (oper_speed && init_speed && oper_speed != init_speed)
585 /* Check that the controller is ready */
586 err = intel_wait_booting(hu);
588 clear_bit(STATE_BOOTING, &intel->flags);
590 /* In case of timeout, try to continue anyway */
591 if (err && err != -ETIMEDOUT)
594 set_bit(STATE_BOOTLOADER, &intel->flags);
596 /* Read the Intel version information to determine if the device
597 * is in bootloader mode or if it already has operational firmware
600 err = btintel_read_version(hdev, &ver);
604 /* The hardware platform number has a fixed value of 0x37 and
605 * for now only accept this single value.
607 if (ver.hw_platform != 0x37) {
608 bt_dev_err(hdev, "Unsupported Intel hardware platform (%u)",
613 /* At the moment only the hardware variant iBT 3.0 (LnP/SfP) is
614 * supported by this firmware loading method. This check has been
615 * put in place to ensure correct forward compatibility options
616 * when newer hardware variants come along.
618 if (ver.hw_variant != 0x0b) {
619 bt_dev_err(hdev, "Unsupported Intel hardware variant (%u)",
624 btintel_version_info(hdev, &ver);
626 /* The firmware variant determines if the device is in bootloader
627 * mode or is running operational firmware. The value 0x06 identifies
628 * the bootloader and the value 0x23 identifies the operational
631 * When the operational firmware is already present, then only
632 * the check for valid Bluetooth device address is needed. This
633 * determines if the device will be added as configured or
634 * unconfigured controller.
636 * It is not possible to use the Secure Boot Parameters in this
637 * case since that command is only available in bootloader mode.
639 if (ver.fw_variant == 0x23) {
640 clear_bit(STATE_BOOTLOADER, &intel->flags);
641 btintel_check_bdaddr(hdev);
645 /* If the device is not in bootloader mode, then the only possible
646 * choice is to return an error and abort the device initialization.
648 if (ver.fw_variant != 0x06) {
649 bt_dev_err(hdev, "Unsupported Intel firmware variant (%u)",
654 /* Read the secure boot parameters to identify the operating
655 * details of the bootloader.
657 skb = __hci_cmd_sync(hdev, 0xfc0d, 0, NULL, HCI_CMD_TIMEOUT);
659 bt_dev_err(hdev, "Reading Intel boot parameters failed (%ld)",
664 if (skb->len != sizeof(*params)) {
665 bt_dev_err(hdev, "Intel boot parameters size mismatch");
670 params = (struct intel_boot_params *)skb->data;
671 if (params->status) {
672 bt_dev_err(hdev, "Intel boot parameters command failure (%02x)",
674 err = -bt_to_errno(params->status);
679 bt_dev_info(hdev, "Device revision is %u",
680 le16_to_cpu(params->dev_revid));
682 bt_dev_info(hdev, "Secure boot is %s",
683 params->secure_boot ? "enabled" : "disabled");
685 bt_dev_info(hdev, "Minimum firmware build %u week %u %u",
686 params->min_fw_build_nn, params->min_fw_build_cw,
687 2000 + params->min_fw_build_yy);
689 /* It is required that every single firmware fragment is acknowledged
690 * with a command complete event. If the boot parameters indicate
691 * that this bootloader does not send them, then abort the setup.
693 if (params->limited_cce != 0x00) {
694 bt_dev_err(hdev, "Unsupported Intel firmware loading method (%u)",
695 params->limited_cce);
700 /* If the OTP has no valid Bluetooth device address, then there will
701 * also be no valid address for the operational firmware.
703 if (!bacmp(¶ms->otp_bdaddr, BDADDR_ANY)) {
704 bt_dev_info(hdev, "No device address configured");
705 set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
708 /* With this Intel bootloader only the hardware variant and device
709 * revision information are used to select the right firmware.
711 * Currently this bootloader support is limited to hardware variant
712 * iBT 3.0 (LnP/SfP) which is identified by the value 11 (0x0b).
714 snprintf(fwname, sizeof(fwname), "/*(DEBLOBBED)*/",
715 le16_to_cpu(params->dev_revid));
717 err = reject_firmware(&fw, fwname, &hdev->dev);
719 bt_dev_err(hdev, "Failed to load Intel firmware file (%d)",
725 bt_dev_info(hdev, "Found device firmware: %s", fwname);
727 /* Save the DDC file name for later */
728 snprintf(fwname, sizeof(fwname), "intel/ibt-11-%u.ddc",
729 le16_to_cpu(params->dev_revid));
733 if (fw->size < 644) {
734 bt_dev_err(hdev, "Invalid size of firmware file (%zu)",
740 set_bit(STATE_DOWNLOADING, &intel->flags);
742 /* Start the firmware download transaction with the Init fragment
743 * represented by the 128 bytes of CSS header.
745 err = btintel_secure_send(hdev, 0x00, 128, fw->data);
747 bt_dev_err(hdev, "Failed to send firmware header (%d)", err);
751 /* Send the 256 bytes of public key information from the firmware
752 * as the PKey fragment.
754 err = btintel_secure_send(hdev, 0x03, 256, fw->data + 128);
756 bt_dev_err(hdev, "Failed to send firmware public key (%d)",
761 /* Send the 256 bytes of signature information from the firmware
762 * as the Sign fragment.
764 err = btintel_secure_send(hdev, 0x02, 256, fw->data + 388);
766 bt_dev_err(hdev, "Failed to send firmware signature (%d)",
771 fw_ptr = fw->data + 644;
774 while (fw_ptr - fw->data < fw->size) {
775 struct hci_command_hdr *cmd = (void *)(fw_ptr + frag_len);
777 frag_len += sizeof(*cmd) + cmd->plen;
779 bt_dev_dbg(hdev, "Patching %td/%zu", (fw_ptr - fw->data),
782 /* The parameter length of the secure send command requires
783 * a 4 byte alignment. It happens so that the firmware file
784 * contains proper Intel_NOP commands to align the fragments
787 * Send set of commands with 4 byte alignment from the
788 * firmware data buffer as a single Data fragement.
793 /* Send each command from the firmware data buffer as
794 * a single Data fragment.
796 err = btintel_secure_send(hdev, 0x01, frag_len, fw_ptr);
798 bt_dev_err(hdev, "Failed to send firmware data (%d)",
807 set_bit(STATE_FIRMWARE_LOADED, &intel->flags);
809 bt_dev_info(hdev, "Waiting for firmware download to complete");
811 /* Before switching the device into operational mode and with that
812 * booting the loaded firmware, wait for the bootloader notification
813 * that all fragments have been successfully received.
815 * When the event processing receives the notification, then the
816 * STATE_DOWNLOADING flag will be cleared.
818 * The firmware loading should not take longer than 5 seconds
819 * and thus just timeout if that happens and fail the setup
822 err = wait_on_bit_timeout(&intel->flags, STATE_DOWNLOADING,
824 msecs_to_jiffies(5000));
826 bt_dev_err(hdev, "Firmware loading interrupted");
832 bt_dev_err(hdev, "Firmware loading timeout");
837 if (test_bit(STATE_FIRMWARE_FAILED, &intel->flags)) {
838 bt_dev_err(hdev, "Firmware loading failed");
843 rettime = ktime_get();
844 delta = ktime_sub(rettime, calltime);
845 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
847 bt_dev_info(hdev, "Firmware loaded in %llu usecs", duration);
850 release_firmware(fw);
855 /* We need to restore the default speed before Intel reset */
857 err = intel_set_baudrate(hu, init_speed);
862 calltime = ktime_get();
864 set_bit(STATE_BOOTING, &intel->flags);
866 skb = __hci_cmd_sync(hdev, 0xfc01, sizeof(reset_param), reset_param,
873 /* The bootloader will not indicate when the device is ready. This
874 * is done by the operational firmware sending bootup notification.
876 * Booting into operational firmware should not take longer than
877 * 1 second. However if that happens, then just fail the setup
878 * since something went wrong.
880 bt_dev_info(hdev, "Waiting for device to boot");
882 err = intel_wait_booting(hu);
886 clear_bit(STATE_BOOTING, &intel->flags);
888 rettime = ktime_get();
889 delta = ktime_sub(rettime, calltime);
890 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
892 bt_dev_info(hdev, "Device booted in %llu usecs", duration);
894 /* Enable LPM if matching pdev with wakeup enabled, set TX active
895 * until further LPM TX notification.
897 mutex_lock(&intel_device_list_lock);
898 list_for_each(p, &intel_device_list) {
899 struct intel_device *dev = list_entry(p, struct intel_device,
903 if (hu->tty->dev->parent == dev->pdev->dev.parent) {
904 if (device_may_wakeup(&dev->pdev->dev)) {
905 set_bit(STATE_LPM_ENABLED, &intel->flags);
906 set_bit(STATE_TX_ACTIVE, &intel->flags);
911 mutex_unlock(&intel_device_list_lock);
913 /* Ignore errors, device can work without DDC parameters */
914 btintel_load_ddc_config(hdev, fwname);
916 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_CMD_TIMEOUT);
922 err = intel_set_baudrate(hu, oper_speed);
927 bt_dev_info(hdev, "Setup complete");
929 clear_bit(STATE_BOOTLOADER, &intel->flags);
934 static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
936 struct hci_uart *hu = hci_get_drvdata(hdev);
937 struct intel_data *intel = hu->priv;
938 struct hci_event_hdr *hdr;
940 if (!test_bit(STATE_BOOTLOADER, &intel->flags) &&
941 !test_bit(STATE_BOOTING, &intel->flags))
944 hdr = (void *)skb->data;
946 /* When the firmware loading completes the device sends
947 * out a vendor specific event indicating the result of
948 * the firmware loading.
950 if (skb->len == 7 && hdr->evt == 0xff && hdr->plen == 0x05 &&
951 skb->data[2] == 0x06) {
952 if (skb->data[3] != 0x00)
953 set_bit(STATE_FIRMWARE_FAILED, &intel->flags);
955 if (test_and_clear_bit(STATE_DOWNLOADING, &intel->flags) &&
956 test_bit(STATE_FIRMWARE_LOADED, &intel->flags)) {
957 smp_mb__after_atomic();
958 wake_up_bit(&intel->flags, STATE_DOWNLOADING);
961 /* When switching to the operational firmware the device
962 * sends a vendor specific event indicating that the bootup
965 } else if (skb->len == 9 && hdr->evt == 0xff && hdr->plen == 0x07 &&
966 skb->data[2] == 0x02) {
967 if (test_and_clear_bit(STATE_BOOTING, &intel->flags)) {
968 smp_mb__after_atomic();
969 wake_up_bit(&intel->flags, STATE_BOOTING);
973 return hci_recv_frame(hdev, skb);
976 static void intel_recv_lpm_notify(struct hci_dev *hdev, int value)
978 struct hci_uart *hu = hci_get_drvdata(hdev);
979 struct intel_data *intel = hu->priv;
981 bt_dev_dbg(hdev, "TX idle notification (%d)", value);
984 set_bit(STATE_TX_ACTIVE, &intel->flags);
985 schedule_work(&intel->busy_work);
987 clear_bit(STATE_TX_ACTIVE, &intel->flags);
991 static int intel_recv_lpm(struct hci_dev *hdev, struct sk_buff *skb)
993 struct hci_lpm_pkt *lpm = (void *)skb->data;
994 struct hci_uart *hu = hci_get_drvdata(hdev);
995 struct intel_data *intel = hu->priv;
997 switch (lpm->opcode) {
998 case LPM_OP_TX_NOTIFY:
1000 bt_dev_err(hu->hdev, "Invalid LPM notification packet");
1003 intel_recv_lpm_notify(hdev, lpm->data[0]);
1005 case LPM_OP_SUSPEND_ACK:
1006 set_bit(STATE_SUSPENDED, &intel->flags);
1007 if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags)) {
1008 smp_mb__after_atomic();
1009 wake_up_bit(&intel->flags, STATE_LPM_TRANSACTION);
1012 case LPM_OP_RESUME_ACK:
1013 clear_bit(STATE_SUSPENDED, &intel->flags);
1014 if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags)) {
1015 smp_mb__after_atomic();
1016 wake_up_bit(&intel->flags, STATE_LPM_TRANSACTION);
1020 bt_dev_err(hdev, "Unknown LPM opcode (%02x)", lpm->opcode);
1029 #define INTEL_RECV_LPM \
1030 .type = HCI_LPM_PKT, \
1031 .hlen = HCI_LPM_HDR_SIZE, \
1034 .maxlen = HCI_LPM_MAX_SIZE
1036 static const struct h4_recv_pkt intel_recv_pkts[] = {
1037 { H4_RECV_ACL, .recv = hci_recv_frame },
1038 { H4_RECV_SCO, .recv = hci_recv_frame },
1039 { H4_RECV_EVENT, .recv = intel_recv_event },
1040 { INTEL_RECV_LPM, .recv = intel_recv_lpm },
1043 static int intel_recv(struct hci_uart *hu, const void *data, int count)
1045 struct intel_data *intel = hu->priv;
1047 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
1050 intel->rx_skb = h4_recv_buf(hu->hdev, intel->rx_skb, data, count,
1052 ARRAY_SIZE(intel_recv_pkts));
1053 if (IS_ERR(intel->rx_skb)) {
1054 int err = PTR_ERR(intel->rx_skb);
1055 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
1056 intel->rx_skb = NULL;
1063 static int intel_enqueue(struct hci_uart *hu, struct sk_buff *skb)
1065 struct intel_data *intel = hu->priv;
1066 struct list_head *p;
1068 BT_DBG("hu %p skb %p", hu, skb);
1073 /* Be sure our controller is resumed and potential LPM transaction
1074 * completed before enqueuing any packet.
1076 mutex_lock(&intel_device_list_lock);
1077 list_for_each(p, &intel_device_list) {
1078 struct intel_device *idev = list_entry(p, struct intel_device,
1081 if (hu->tty->dev->parent == idev->pdev->dev.parent) {
1082 pm_runtime_get_sync(&idev->pdev->dev);
1083 pm_runtime_mark_last_busy(&idev->pdev->dev);
1084 pm_runtime_put_autosuspend(&idev->pdev->dev);
1088 mutex_unlock(&intel_device_list_lock);
1090 skb_queue_tail(&intel->txq, skb);
1095 static struct sk_buff *intel_dequeue(struct hci_uart *hu)
1097 struct intel_data *intel = hu->priv;
1098 struct sk_buff *skb;
1100 skb = skb_dequeue(&intel->txq);
1104 if (test_bit(STATE_BOOTLOADER, &intel->flags) &&
1105 (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT)) {
1106 struct hci_command_hdr *cmd = (void *)skb->data;
1107 __u16 opcode = le16_to_cpu(cmd->opcode);
1109 /* When the 0xfc01 command is issued to boot into
1110 * the operational firmware, it will actually not
1111 * send a command complete event. To keep the flow
1112 * control working inject that event here.
1114 if (opcode == 0xfc01)
1115 inject_cmd_complete(hu->hdev, opcode);
1118 /* Prepend skb with frame type */
1119 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
1124 static const struct hci_uart_proto intel_proto = {
1125 .id = HCI_UART_INTEL,
1128 .init_speed = 115200,
1129 .oper_speed = 3000000,
1131 .close = intel_close,
1132 .flush = intel_flush,
1133 .setup = intel_setup,
1134 .set_baudrate = intel_set_baudrate,
1136 .enqueue = intel_enqueue,
1137 .dequeue = intel_dequeue,
1141 static const struct acpi_device_id intel_acpi_match[] = {
1145 MODULE_DEVICE_TABLE(acpi, intel_acpi_match);
1149 static int intel_suspend_device(struct device *dev)
1151 struct intel_device *idev = dev_get_drvdata(dev);
1153 mutex_lock(&idev->hu_lock);
1155 intel_lpm_suspend(idev->hu);
1156 mutex_unlock(&idev->hu_lock);
1161 static int intel_resume_device(struct device *dev)
1163 struct intel_device *idev = dev_get_drvdata(dev);
1165 mutex_lock(&idev->hu_lock);
1167 intel_lpm_resume(idev->hu);
1168 mutex_unlock(&idev->hu_lock);
1174 #ifdef CONFIG_PM_SLEEP
1175 static int intel_suspend(struct device *dev)
1177 struct intel_device *idev = dev_get_drvdata(dev);
1179 if (device_may_wakeup(dev))
1180 enable_irq_wake(idev->irq);
1182 return intel_suspend_device(dev);
1185 static int intel_resume(struct device *dev)
1187 struct intel_device *idev = dev_get_drvdata(dev);
1189 if (device_may_wakeup(dev))
1190 disable_irq_wake(idev->irq);
1192 return intel_resume_device(dev);
1196 static const struct dev_pm_ops intel_pm_ops = {
1197 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
1198 SET_RUNTIME_PM_OPS(intel_suspend_device, intel_resume_device, NULL)
1201 static int intel_probe(struct platform_device *pdev)
1203 struct intel_device *idev;
1205 idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL);
1209 mutex_init(&idev->hu_lock);
1213 idev->reset = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
1214 if (IS_ERR(idev->reset)) {
1215 dev_err(&pdev->dev, "Unable to retrieve gpio\n");
1216 return PTR_ERR(idev->reset);
1219 idev->irq = platform_get_irq(pdev, 0);
1220 if (idev->irq < 0) {
1221 struct gpio_desc *host_wake;
1223 dev_err(&pdev->dev, "No IRQ, falling back to gpio-irq\n");
1225 host_wake = devm_gpiod_get(&pdev->dev, "host-wake", GPIOD_IN);
1226 if (IS_ERR(host_wake)) {
1227 dev_err(&pdev->dev, "Unable to retrieve IRQ\n");
1231 idev->irq = gpiod_to_irq(host_wake);
1232 if (idev->irq < 0) {
1233 dev_err(&pdev->dev, "No corresponding irq for gpio\n");
1238 /* Only enable wake-up/irq when controller is powered */
1239 device_set_wakeup_capable(&pdev->dev, true);
1240 device_wakeup_disable(&pdev->dev);
1243 platform_set_drvdata(pdev, idev);
1245 /* Place this instance on the device list */
1246 mutex_lock(&intel_device_list_lock);
1247 list_add_tail(&idev->list, &intel_device_list);
1248 mutex_unlock(&intel_device_list_lock);
1250 dev_info(&pdev->dev, "registered, gpio(%d)/irq(%d).\n",
1251 desc_to_gpio(idev->reset), idev->irq);
1256 static int intel_remove(struct platform_device *pdev)
1258 struct intel_device *idev = platform_get_drvdata(pdev);
1260 device_wakeup_disable(&pdev->dev);
1262 mutex_lock(&intel_device_list_lock);
1263 list_del(&idev->list);
1264 mutex_unlock(&intel_device_list_lock);
1266 dev_info(&pdev->dev, "unregistered.\n");
1271 static struct platform_driver intel_driver = {
1272 .probe = intel_probe,
1273 .remove = intel_remove,
1275 .name = "hci_intel",
1276 .acpi_match_table = ACPI_PTR(intel_acpi_match),
1277 .pm = &intel_pm_ops,
1281 int __init intel_init(void)
1283 platform_driver_register(&intel_driver);
1285 return hci_uart_register_proto(&intel_proto);
1288 int __exit intel_deinit(void)
1290 platform_driver_unregister(&intel_driver);
1292 return hci_uart_unregister_proto(&intel_proto);