3 * Bluetooth HCI UART driver for Broadcom 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/acpi.h>
31 #include <linux/property.h>
32 #include <linux/platform_data/x86/apple.h>
33 #include <linux/platform_device.h>
34 #include <linux/clk.h>
35 #include <linux/gpio/consumer.h>
36 #include <linux/tty.h>
37 #include <linux/interrupt.h>
38 #include <linux/dmi.h>
39 #include <linux/pm_runtime.h>
40 #include <linux/serdev.h>
42 #include <net/bluetooth/bluetooth.h>
43 #include <net/bluetooth/hci_core.h>
48 #define BCM_NULL_PKT 0x00
49 #define BCM_NULL_SIZE 0
51 #define BCM_LM_DIAG_PKT 0x07
52 #define BCM_LM_DIAG_SIZE 63
54 #define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
57 * struct bcm_device - device driver resources
58 * @serdev_hu: HCI UART controller struct
59 * @list: bcm_device_list node
60 * @dev: physical UART slave
61 * @name: device name logged by bt_dev_*() functions
62 * @device_wakeup: BT_WAKE pin,
63 * assert = Bluetooth device must wake up or remain awake,
64 * deassert = Bluetooth device may sleep when sleep criteria are met
65 * @shutdown: BT_REG_ON pin,
66 * power up or power down Bluetooth device internal regulators
67 * @set_device_wakeup: callback to toggle BT_WAKE pin
68 * either by accessing @device_wakeup or by calling @btlp
69 * @set_shutdown: callback to toggle BT_REG_ON pin
70 * either by accessing @shutdown or by calling @btpu/@btpd
71 * @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
72 * @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
73 * @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
74 * @clk: clock used by Bluetooth device
75 * @clk_enabled: whether @clk is prepared and enabled
76 * @init_speed: default baudrate of Bluetooth device;
77 * the host UART is initially set to this baudrate so that
78 * it can configure the Bluetooth device for @oper_speed
79 * @oper_speed: preferred baudrate of Bluetooth device;
80 * set to 0 if @init_speed is already the preferred baudrate
81 * @irq: interrupt triggered by HOST_WAKE_BT pin
82 * @irq_active_low: whether @irq is active low
83 * @hu: pointer to HCI UART controller struct,
84 * used to disable flow control during runtime suspend and system sleep
85 * @is_suspended: whether flow control is currently disabled
88 /* Must be the first member, hci_serdev.c expects this. */
89 struct hci_uart serdev_hu;
90 struct list_head list;
95 struct gpio_desc *device_wakeup;
96 struct gpio_desc *shutdown;
97 int (*set_device_wakeup)(struct bcm_device *, bool);
98 int (*set_shutdown)(struct bcm_device *, bool);
100 acpi_handle btlp, btpu, btpd;
119 /* generic bcm uart resources */
121 struct sk_buff *rx_skb;
122 struct sk_buff_head txq;
124 struct bcm_device *dev;
127 /* List of BCM BT UART devices */
128 static DEFINE_MUTEX(bcm_device_lock);
129 static LIST_HEAD(bcm_device_list);
131 static int irq_polarity = -1;
132 module_param(irq_polarity, int, 0444);
133 MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
135 static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
138 serdev_device_set_baudrate(hu->serdev, speed);
140 hci_uart_set_baudrate(hu, speed);
143 static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed)
145 struct hci_dev *hdev = hu->hdev;
147 struct bcm_update_uart_baud_rate param;
149 if (speed > 3000000) {
150 struct bcm_write_uart_clock_setting clock;
152 clock.type = BCM_UART_CLOCK_48MHZ;
154 bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type);
156 /* This Broadcom specific command changes the UART's controller
157 * clock for baud rate > 3000000.
159 skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT);
161 int err = PTR_ERR(skb);
162 bt_dev_err(hdev, "BCM: failed to write clock (%d)",
170 bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed);
172 param.zero = cpu_to_le16(0);
173 param.baud_rate = cpu_to_le32(speed);
175 /* This Broadcom specific command changes the UART's controller baud
178 skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m,
181 int err = PTR_ERR(skb);
182 bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)",
192 /* bcm_device_exists should be protected by bcm_device_lock */
193 static bool bcm_device_exists(struct bcm_device *device)
198 /* Devices using serdev always exist */
199 if (device && device->hu && device->hu->serdev)
203 list_for_each(p, &bcm_device_list) {
204 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
213 static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
217 if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) {
218 err = clk_prepare_enable(dev->clk);
223 err = dev->set_shutdown(dev, powered);
225 goto err_clk_disable;
227 err = dev->set_device_wakeup(dev, powered);
229 goto err_revert_shutdown;
231 if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled)
232 clk_disable_unprepare(dev->clk);
234 dev->clk_enabled = powered;
239 dev->set_shutdown(dev, !powered);
241 if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled)
242 clk_disable_unprepare(dev->clk);
247 static irqreturn_t bcm_host_wake(int irq, void *data)
249 struct bcm_device *bdev = data;
251 bt_dev_dbg(bdev, "Host wake IRQ");
253 pm_runtime_get(bdev->dev);
254 pm_runtime_mark_last_busy(bdev->dev);
255 pm_runtime_put_autosuspend(bdev->dev);
260 static int bcm_request_irq(struct bcm_data *bcm)
262 struct bcm_device *bdev = bcm->dev;
265 mutex_lock(&bcm_device_lock);
266 if (!bcm_device_exists(bdev)) {
271 if (bdev->irq <= 0) {
276 err = devm_request_irq(bdev->dev, bdev->irq, bcm_host_wake,
277 bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
285 device_init_wakeup(bdev->dev, true);
287 pm_runtime_set_autosuspend_delay(bdev->dev,
288 BCM_AUTOSUSPEND_DELAY);
289 pm_runtime_use_autosuspend(bdev->dev);
290 pm_runtime_set_active(bdev->dev);
291 pm_runtime_enable(bdev->dev);
294 mutex_unlock(&bcm_device_lock);
299 static const struct bcm_set_sleep_mode default_sleep_params = {
300 .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */
301 .idle_host = 2, /* idle threshold HOST, in 300ms */
302 .idle_dev = 2, /* idle threshold device, in 300ms */
303 .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */
304 .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */
305 .allow_host_sleep = 1, /* Allow host sleep in SCO flag */
306 .combine_modes = 1, /* Combine sleep and LPM flag */
307 .tristate_control = 0, /* Allow tri-state control of UART tx flag */
308 /* Irrelevant USB flags */
310 .usb_resume_timeout = 0,
312 .pulsed_host_wake = 1,
315 static int bcm_setup_sleep(struct hci_uart *hu)
317 struct bcm_data *bcm = hu->priv;
319 struct bcm_set_sleep_mode sleep_params = default_sleep_params;
321 sleep_params.host_wake_active = !bcm->dev->irq_active_low;
323 skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params),
324 &sleep_params, HCI_INIT_TIMEOUT);
326 int err = PTR_ERR(skb);
327 bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err);
332 bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded");
337 static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; }
338 static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; }
341 static int bcm_set_diag(struct hci_dev *hdev, bool enable)
343 struct hci_uart *hu = hci_get_drvdata(hdev);
344 struct bcm_data *bcm = hu->priv;
347 if (!test_bit(HCI_RUNNING, &hdev->flags))
350 skb = bt_skb_alloc(3, GFP_KERNEL);
354 skb_put_u8(skb, BCM_LM_DIAG_PKT);
355 skb_put_u8(skb, 0xf0);
356 skb_put_u8(skb, enable);
358 skb_queue_tail(&bcm->txq, skb);
359 hci_uart_tx_wakeup(hu);
364 static int bcm_open(struct hci_uart *hu)
366 struct bcm_data *bcm;
370 bt_dev_dbg(hu->hdev, "hu %p", hu);
372 if (!hci_uart_has_flow_control(hu))
375 bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
379 skb_queue_head_init(&bcm->txq);
383 mutex_lock(&bcm_device_lock);
386 bcm->dev = serdev_device_get_drvdata(hu->serdev);
393 list_for_each(p, &bcm_device_list) {
394 struct bcm_device *dev = list_entry(p, struct bcm_device, list);
396 /* Retrieve saved bcm_device based on parent of the
397 * platform device (saved during device probe) and
398 * parent of tty device used by hci_uart
400 if (hu->tty->dev->parent == dev->dev->parent) {
411 hu->init_speed = bcm->dev->init_speed;
412 hu->oper_speed = bcm->dev->oper_speed;
413 err = bcm_gpio_set_power(bcm->dev, true);
418 mutex_unlock(&bcm_device_lock);
426 mutex_unlock(&bcm_device_lock);
432 static int bcm_close(struct hci_uart *hu)
434 struct bcm_data *bcm = hu->priv;
435 struct bcm_device *bdev = NULL;
438 bt_dev_dbg(hu->hdev, "hu %p", hu);
440 /* Protect bcm->dev against removal of the device or driver */
441 mutex_lock(&bcm_device_lock);
444 bdev = serdev_device_get_drvdata(hu->serdev);
445 } else if (bcm_device_exists(bcm->dev)) {
453 if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) {
454 devm_free_irq(bdev->dev, bdev->irq, bdev);
455 device_init_wakeup(bdev->dev, false);
456 pm_runtime_disable(bdev->dev);
459 err = bcm_gpio_set_power(bdev, false);
461 bt_dev_err(hu->hdev, "Failed to power down");
463 pm_runtime_set_suspended(bdev->dev);
465 mutex_unlock(&bcm_device_lock);
467 skb_queue_purge(&bcm->txq);
468 kfree_skb(bcm->rx_skb);
475 static int bcm_flush(struct hci_uart *hu)
477 struct bcm_data *bcm = hu->priv;
479 bt_dev_dbg(hu->hdev, "hu %p", hu);
481 skb_queue_purge(&bcm->txq);
486 static int bcm_setup(struct hci_uart *hu)
488 struct bcm_data *bcm = hu->priv;
490 const struct firmware *fw;
494 bt_dev_dbg(hu->hdev, "hu %p", hu);
496 hu->hdev->set_diag = bcm_set_diag;
497 hu->hdev->set_bdaddr = btbcm_set_bdaddr;
499 err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name), false);
503 err = request_firmware(&fw, fw_name, &hu->hdev->dev);
505 bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name);
509 err = btbcm_patchram(hu->hdev, fw);
511 bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err);
515 /* Init speed if any */
517 speed = hu->init_speed;
518 else if (hu->proto->init_speed)
519 speed = hu->proto->init_speed;
524 host_set_baudrate(hu, speed);
526 /* Operational speed if any */
528 speed = hu->oper_speed;
529 else if (hu->proto->oper_speed)
530 speed = hu->proto->oper_speed;
535 err = bcm_set_baudrate(hu, speed);
537 host_set_baudrate(hu, speed);
541 release_firmware(fw);
543 err = btbcm_finalize(hu->hdev);
547 if (!bcm_request_irq(bcm))
548 err = bcm_setup_sleep(hu);
553 #define BCM_RECV_LM_DIAG \
554 .type = BCM_LM_DIAG_PKT, \
555 .hlen = BCM_LM_DIAG_SIZE, \
558 .maxlen = BCM_LM_DIAG_SIZE
560 #define BCM_RECV_NULL \
561 .type = BCM_NULL_PKT, \
562 .hlen = BCM_NULL_SIZE, \
565 .maxlen = BCM_NULL_SIZE
567 static const struct h4_recv_pkt bcm_recv_pkts[] = {
568 { H4_RECV_ACL, .recv = hci_recv_frame },
569 { H4_RECV_SCO, .recv = hci_recv_frame },
570 { H4_RECV_EVENT, .recv = hci_recv_frame },
571 { BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
572 { BCM_RECV_NULL, .recv = hci_recv_diag },
575 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
577 struct bcm_data *bcm = hu->priv;
579 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
582 bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
583 bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
584 if (IS_ERR(bcm->rx_skb)) {
585 int err = PTR_ERR(bcm->rx_skb);
586 bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
589 } else if (!bcm->rx_skb) {
590 /* Delay auto-suspend when receiving completed packet */
591 mutex_lock(&bcm_device_lock);
592 if (bcm->dev && bcm_device_exists(bcm->dev)) {
593 pm_runtime_get(bcm->dev->dev);
594 pm_runtime_mark_last_busy(bcm->dev->dev);
595 pm_runtime_put_autosuspend(bcm->dev->dev);
597 mutex_unlock(&bcm_device_lock);
603 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
605 struct bcm_data *bcm = hu->priv;
607 bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb);
609 /* Prepend skb with frame type */
610 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
611 skb_queue_tail(&bcm->txq, skb);
616 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
618 struct bcm_data *bcm = hu->priv;
619 struct sk_buff *skb = NULL;
620 struct bcm_device *bdev = NULL;
622 mutex_lock(&bcm_device_lock);
624 if (bcm_device_exists(bcm->dev)) {
626 pm_runtime_get_sync(bdev->dev);
627 /* Shall be resumed here */
630 skb = skb_dequeue(&bcm->txq);
633 pm_runtime_mark_last_busy(bdev->dev);
634 pm_runtime_put_autosuspend(bdev->dev);
637 mutex_unlock(&bcm_device_lock);
643 static int bcm_suspend_device(struct device *dev)
645 struct bcm_device *bdev = dev_get_drvdata(dev);
648 bt_dev_dbg(bdev, "");
650 if (!bdev->is_suspended && bdev->hu) {
651 hci_uart_set_flow_control(bdev->hu, true);
653 /* Once this returns, driver suspends BT via GPIO */
654 bdev->is_suspended = true;
657 /* Suspend the device */
658 err = bdev->set_device_wakeup(bdev, false);
660 if (bdev->is_suspended && bdev->hu) {
661 bdev->is_suspended = false;
662 hci_uart_set_flow_control(bdev->hu, false);
667 bt_dev_dbg(bdev, "suspend, delaying 15 ms");
673 static int bcm_resume_device(struct device *dev)
675 struct bcm_device *bdev = dev_get_drvdata(dev);
678 bt_dev_dbg(bdev, "");
680 err = bdev->set_device_wakeup(bdev, true);
682 dev_err(dev, "Failed to power up\n");
686 bt_dev_dbg(bdev, "resume, delaying 15 ms");
689 /* When this executes, the device has woken up already */
690 if (bdev->is_suspended && bdev->hu) {
691 bdev->is_suspended = false;
693 hci_uart_set_flow_control(bdev->hu, false);
700 #ifdef CONFIG_PM_SLEEP
701 /* suspend callback */
702 static int bcm_suspend(struct device *dev)
704 struct bcm_device *bdev = dev_get_drvdata(dev);
707 bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
710 * When used with a device instantiated as platform_device, bcm_suspend
711 * can be called at any time as long as the platform device is bound,
712 * so it should use bcm_device_lock to protect access to hci_uart
713 * and device_wake-up GPIO.
715 mutex_lock(&bcm_device_lock);
720 if (pm_runtime_active(dev))
721 bcm_suspend_device(dev);
723 if (device_may_wakeup(dev) && bdev->irq > 0) {
724 error = enable_irq_wake(bdev->irq);
726 bt_dev_dbg(bdev, "BCM irq: enabled");
730 mutex_unlock(&bcm_device_lock);
735 /* resume callback */
736 static int bcm_resume(struct device *dev)
738 struct bcm_device *bdev = dev_get_drvdata(dev);
741 bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
744 * When used with a device instantiated as platform_device, bcm_resume
745 * can be called at any time as long as platform device is bound,
746 * so it should use bcm_device_lock to protect access to hci_uart
747 * and device_wake-up GPIO.
749 mutex_lock(&bcm_device_lock);
754 if (device_may_wakeup(dev) && bdev->irq > 0) {
755 disable_irq_wake(bdev->irq);
756 bt_dev_dbg(bdev, "BCM irq: disabled");
759 err = bcm_resume_device(dev);
762 mutex_unlock(&bcm_device_lock);
765 pm_runtime_disable(dev);
766 pm_runtime_set_active(dev);
767 pm_runtime_enable(dev);
774 static const struct acpi_gpio_params first_gpio = { 0, 0, false };
775 static const struct acpi_gpio_params second_gpio = { 1, 0, false };
776 static const struct acpi_gpio_params third_gpio = { 2, 0, false };
778 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
779 { "device-wakeup-gpios", &first_gpio, 1 },
780 { "shutdown-gpios", &second_gpio, 1 },
781 { "host-wakeup-gpios", &third_gpio, 1 },
785 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
786 { "host-wakeup-gpios", &first_gpio, 1 },
787 { "device-wakeup-gpios", &second_gpio, 1 },
788 { "shutdown-gpios", &third_gpio, 1 },
792 /* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
793 static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
795 .ident = "Meegopad T08",
797 DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
798 "To be filled by OEM."),
799 DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
800 DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
807 static int bcm_resource(struct acpi_resource *ares, void *data)
809 struct bcm_device *dev = data;
810 struct acpi_resource_extended_irq *irq;
811 struct acpi_resource_gpio *gpio;
812 struct acpi_resource_uart_serialbus *sb;
814 switch (ares->type) {
815 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
816 irq = &ares->data.extended_irq;
817 if (irq->polarity != ACPI_ACTIVE_LOW)
818 dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
819 dev->irq_active_low = true;
822 case ACPI_RESOURCE_TYPE_GPIO:
823 gpio = &ares->data.gpio;
824 if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
825 dev->gpio_int_idx = dev->gpio_count;
826 dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
831 case ACPI_RESOURCE_TYPE_SERIAL_BUS:
832 sb = &ares->data.uart_serial_bus;
833 if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) {
834 dev->init_speed = sb->default_baud_rate;
835 dev->oper_speed = 4000000;
846 static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
848 if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
854 static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
856 if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
863 static int bcm_apple_get_resources(struct bcm_device *dev)
865 struct acpi_device *adev = ACPI_COMPANION(dev->dev);
866 const union acpi_object *obj;
869 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
870 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
871 ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
874 if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
875 obj->buffer.length == 8)
876 dev->init_speed = *(u64 *)obj->buffer.pointer;
878 dev->set_device_wakeup = bcm_apple_set_device_wakeup;
879 dev->set_shutdown = bcm_apple_set_shutdown;
884 static inline int bcm_apple_get_resources(struct bcm_device *dev)
888 #endif /* CONFIG_ACPI */
890 static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
892 gpiod_set_value_cansleep(dev->device_wakeup, awake);
896 static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
898 gpiod_set_value_cansleep(dev->shutdown, powered);
902 static int bcm_get_resources(struct bcm_device *dev)
904 const struct dmi_system_id *dmi_id;
906 dev->name = dev_name(dev->dev);
908 if (x86_apple_machine && !bcm_apple_get_resources(dev))
911 dev->clk = devm_clk_get(dev->dev, NULL);
913 /* Handle deferred probing */
914 if (dev->clk == ERR_PTR(-EPROBE_DEFER))
915 return PTR_ERR(dev->clk);
917 dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
919 if (IS_ERR(dev->device_wakeup))
920 return PTR_ERR(dev->device_wakeup);
922 dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
924 if (IS_ERR(dev->shutdown))
925 return PTR_ERR(dev->shutdown);
927 dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
928 dev->set_shutdown = bcm_gpio_set_shutdown;
930 /* IRQ can be declared in ACPI table as Interrupt or GpioInt */
932 struct gpio_desc *gpio;
934 gpio = devm_gpiod_get_optional(dev->dev, "host-wakeup",
937 return PTR_ERR(gpio);
939 dev->irq = gpiod_to_irq(gpio);
942 dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
944 dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
949 dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
954 static int bcm_acpi_probe(struct bcm_device *dev)
956 LIST_HEAD(resources);
957 const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
958 struct resource_entry *entry;
961 /* Retrieve UART ACPI info */
962 dev->gpio_int_idx = -1;
963 ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
964 &resources, bcm_resource, dev);
968 resource_list_for_each_entry(entry, &resources) {
969 if (resource_type(entry->res) == IORESOURCE_IRQ) {
970 dev->irq = entry->res->start;
974 acpi_dev_free_resource_list(&resources);
976 /* If the DSDT uses an Interrupt resource for the IRQ, then there are
977 * only 2 GPIO resources, we use the irq-last mapping for this, since
978 * we already have an irq the 3th / last mapping will not be used.
981 gpio_mapping = acpi_bcm_int_last_gpios;
982 else if (dev->gpio_int_idx == 0)
983 gpio_mapping = acpi_bcm_int_first_gpios;
984 else if (dev->gpio_int_idx == 2)
985 gpio_mapping = acpi_bcm_int_last_gpios;
987 dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
990 /* Warn if our expectations are not met. */
991 if (dev->gpio_count != (dev->irq ? 2 : 3))
992 dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
995 ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
999 if (irq_polarity != -1) {
1000 dev->irq_active_low = irq_polarity;
1001 dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
1002 dev->irq_active_low ? "low" : "high");
1008 static int bcm_acpi_probe(struct bcm_device *dev)
1012 #endif /* CONFIG_ACPI */
1014 static int bcm_of_probe(struct bcm_device *bdev)
1016 device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
1020 static int bcm_probe(struct platform_device *pdev)
1022 struct bcm_device *dev;
1025 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1029 dev->dev = &pdev->dev;
1030 dev->irq = platform_get_irq(pdev, 0);
1032 if (has_acpi_companion(&pdev->dev)) {
1033 ret = bcm_acpi_probe(dev);
1038 ret = bcm_get_resources(dev);
1042 platform_set_drvdata(pdev, dev);
1044 dev_info(&pdev->dev, "%s device registered.\n", dev->name);
1046 /* Place this instance on the device list */
1047 mutex_lock(&bcm_device_lock);
1048 list_add_tail(&dev->list, &bcm_device_list);
1049 mutex_unlock(&bcm_device_lock);
1051 ret = bcm_gpio_set_power(dev, false);
1053 dev_err(&pdev->dev, "Failed to power down\n");
1058 static int bcm_remove(struct platform_device *pdev)
1060 struct bcm_device *dev = platform_get_drvdata(pdev);
1062 mutex_lock(&bcm_device_lock);
1063 list_del(&dev->list);
1064 mutex_unlock(&bcm_device_lock);
1066 dev_info(&pdev->dev, "%s device unregistered.\n", dev->name);
1071 static const struct hci_uart_proto bcm_proto = {
1075 .init_speed = 115200,
1077 .oper_speed = 460800,
1083 .set_baudrate = bcm_set_baudrate,
1085 .enqueue = bcm_enqueue,
1086 .dequeue = bcm_dequeue,
1090 static const struct acpi_device_id bcm_acpi_match[] = {
1259 MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
1262 /* suspend and resume callbacks */
1263 static const struct dev_pm_ops bcm_pm_ops = {
1264 SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume)
1265 SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL)
1268 static struct platform_driver bcm_driver = {
1270 .remove = bcm_remove,
1273 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1278 static int bcm_serdev_probe(struct serdev_device *serdev)
1280 struct bcm_device *bcmdev;
1283 bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
1287 bcmdev->dev = &serdev->dev;
1289 bcmdev->hu = &bcmdev->serdev_hu;
1291 bcmdev->serdev_hu.serdev = serdev;
1292 serdev_device_set_drvdata(serdev, bcmdev);
1294 if (has_acpi_companion(&serdev->dev))
1295 err = bcm_acpi_probe(bcmdev);
1297 err = bcm_of_probe(bcmdev);
1301 err = bcm_get_resources(bcmdev);
1305 if (!bcmdev->shutdown) {
1306 dev_warn(&serdev->dev,
1307 "No reset resource, using default baud rate\n");
1308 bcmdev->oper_speed = bcmdev->init_speed;
1311 err = bcm_gpio_set_power(bcmdev, false);
1313 dev_err(&serdev->dev, "Failed to power down\n");
1315 return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
1318 static void bcm_serdev_remove(struct serdev_device *serdev)
1320 struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
1322 hci_uart_unregister_device(&bcmdev->serdev_hu);
1326 static const struct of_device_id bcm_bluetooth_of_match[] = {
1327 { .compatible = "brcm,bcm43438-bt" },
1330 MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match);
1333 static struct serdev_device_driver bcm_serdev_driver = {
1334 .probe = bcm_serdev_probe,
1335 .remove = bcm_serdev_remove,
1337 .name = "hci_uart_bcm",
1338 .of_match_table = of_match_ptr(bcm_bluetooth_of_match),
1339 .acpi_match_table = ACPI_PTR(bcm_acpi_match),
1344 int __init bcm_init(void)
1346 /* For now, we need to keep both platform device
1347 * driver (ACPI generated) and serdev driver (DT).
1349 platform_driver_register(&bcm_driver);
1350 serdev_device_driver_register(&bcm_serdev_driver);
1352 return hci_uart_register_proto(&bcm_proto);
1355 int __exit bcm_deinit(void)
1357 platform_driver_unregister(&bcm_driver);
1358 serdev_device_driver_unregister(&bcm_serdev_driver);
1360 return hci_uart_unregister_proto(&bcm_proto);