diff options
Diffstat (limited to 'drivers/bluetooth/hci_bcm.c')
| -rw-r--r-- | drivers/bluetooth/hci_bcm.c | 1023 |
1 files changed, 1023 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c new file mode 100644 index 0000000..a3271bb --- /dev/null +++ b/drivers/bluetooth/hci_bcm.c @@ -0,0 +1,1023 @@ +/* + * + * Bluetooth HCI UART driver for Broadcom devices + * + * Copyright (C) 2015 Intel Corporation + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/skbuff.h> +#include <linux/firmware.h> +#include <linux/module.h> +#include <linux/acpi.h> +#include <linux/of.h> +#include <linux/property.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#if LINUX_VERSION_IS_GEQ(3,13,0) +#include <linux/gpio/consumer.h> +#endif +#include <linux/tty.h> +#include <linux/interrupt.h> +#include <linux/dmi.h> +#include <linux/pm_runtime.h> +#include <linux/serdev.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> + +#include "btbcm.h" +#include "hci_uart.h" + +#define BCM_NULL_PKT 0x00 +#define BCM_NULL_SIZE 0 + +#define BCM_LM_DIAG_PKT 0x07 +#define BCM_LM_DIAG_SIZE 63 + +#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */ + +/* platform device driver resources */ +struct bcm_device { + struct list_head list; + + struct platform_device *pdev; + + const char *name; + struct gpio_desc *device_wakeup; + struct gpio_desc *shutdown; + + struct clk *clk; + bool clk_enabled; + + u32 init_speed; + u32 oper_speed; + int irq; + u8 irq_polarity; + +#ifdef CONFIG_PM + struct hci_uart *hu; + bool is_suspended; /* suspend/resume flag */ +#endif +}; + +/* serdev driver resources */ +struct bcm_serdev { + struct hci_uart hu; +}; + +/* generic bcm uart resources */ +struct bcm_data { + struct sk_buff *rx_skb; + struct sk_buff_head txq; + + struct bcm_device *dev; +}; + +/* List of BCM BT UART devices */ +static DEFINE_MUTEX(bcm_device_lock); +static LIST_HEAD(bcm_device_list); + +static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) +{ + if (hu->serdev) + serdev_device_set_baudrate(hu->serdev, speed); + else + hci_uart_set_baudrate(hu, speed); +} + +static int bcm_set_baudrate(struct hci_uart *hu, unsigned int speed) +{ + struct hci_dev *hdev = hu->hdev; + struct sk_buff *skb; + struct bcm_update_uart_baud_rate param; + + if (speed > 3000000) { + struct bcm_write_uart_clock_setting clock; + + clock.type = BCM_UART_CLOCK_48MHZ; + + bt_dev_dbg(hdev, "Set Controller clock (%d)", clock.type); + + /* This Broadcom specific command changes the UART's controller + * clock for baud rate > 3000000. + */ + skb = __hci_cmd_sync(hdev, 0xfc45, 1, &clock, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + int err = PTR_ERR(skb); + bt_dev_err(hdev, "BCM: failed to write clock (%d)", + err); + return err; + } + + kfree_skb(skb); + } + + bt_dev_dbg(hdev, "Set Controller UART speed to %d bit/s", speed); + + param.zero = cpu_to_le16(0); + param.baud_rate = cpu_to_le32(speed); + + /* This Broadcom specific command changes the UART's controller baud + * rate. + */ + skb = __hci_cmd_sync(hdev, 0xfc18, sizeof(param), ¶m, + HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + int err = PTR_ERR(skb); + bt_dev_err(hdev, "BCM: failed to write update baudrate (%d)", + err); + return err; + } + + kfree_skb(skb); + + return 0; +} + +/* bcm_device_exists should be protected by bcm_device_lock */ +static bool bcm_device_exists(struct bcm_device *device) +{ + struct list_head *p; + + list_for_each(p, &bcm_device_list) { + struct bcm_device *dev = list_entry(p, struct bcm_device, list); + + if (device == dev) + return true; + } + + return false; +} + +static int bcm_gpio_set_power(struct bcm_device *dev, bool powered) +{ + if (powered && !IS_ERR(dev->clk) && !dev->clk_enabled) + clk_prepare_enable(dev->clk); + +#if LINUX_VERSION_IS_GEQ(3,13,0) + gpiod_set_value(dev->shutdown, powered); + gpiod_set_value(dev->device_wakeup, powered); +#endif + + if (!powered && !IS_ERR(dev->clk) && dev->clk_enabled) + clk_disable_unprepare(dev->clk); + + dev->clk_enabled = powered; + + return 0; +} + +#ifdef CONFIG_PM +static irqreturn_t bcm_host_wake(int irq, void *data) +{ + struct bcm_device *bdev = data; + + bt_dev_dbg(bdev, "Host wake IRQ"); + + pm_runtime_get(&bdev->pdev->dev); + pm_runtime_mark_last_busy(&bdev->pdev->dev); + pm_runtime_put_autosuspend(&bdev->pdev->dev); + + return IRQ_HANDLED; +} + +static int bcm_request_irq(struct bcm_data *bcm) +{ + struct bcm_device *bdev = bcm->dev; + int err; + + /* If this is not a platform device, do not enable PM functionalities */ + mutex_lock(&bcm_device_lock); + if (!bcm_device_exists(bdev)) { + err = -ENODEV; + goto unlock; + } + + if (bdev->irq <= 0) { + err = -EOPNOTSUPP; + goto unlock; + } + + err = devm_request_irq(&bdev->pdev->dev, bdev->irq, bcm_host_wake, + IRQF_TRIGGER_RISING, "host_wake", bdev); + if (err) + goto unlock; + + device_init_wakeup(&bdev->pdev->dev, true); + + pm_runtime_set_autosuspend_delay(&bdev->pdev->dev, + BCM_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(&bdev->pdev->dev); + pm_runtime_set_active(&bdev->pdev->dev); + pm_runtime_enable(&bdev->pdev->dev); + +unlock: + mutex_unlock(&bcm_device_lock); + + return err; +} + +static const struct bcm_set_sleep_mode default_sleep_params = { + .sleep_mode = 1, /* 0=Disabled, 1=UART, 2=Reserved, 3=USB */ + .idle_host = 2, /* idle threshold HOST, in 300ms */ + .idle_dev = 2, /* idle threshold device, in 300ms */ + .bt_wake_active = 1, /* BT_WAKE active mode: 1 = high, 0 = low */ + .host_wake_active = 0, /* HOST_WAKE active mode: 1 = high, 0 = low */ + .allow_host_sleep = 1, /* Allow host sleep in SCO flag */ + .combine_modes = 1, /* Combine sleep and LPM flag */ + .tristate_control = 0, /* Allow tri-state control of UART tx flag */ + /* Irrelevant USB flags */ + .usb_auto_sleep = 0, + .usb_resume_timeout = 0, + .pulsed_host_wake = 0, + .break_to_host = 0 +}; + +static int bcm_setup_sleep(struct hci_uart *hu) +{ + struct bcm_data *bcm = hu->priv; + struct sk_buff *skb; + struct bcm_set_sleep_mode sleep_params = default_sleep_params; + + sleep_params.host_wake_active = !bcm->dev->irq_polarity; + + skb = __hci_cmd_sync(hu->hdev, 0xfc27, sizeof(sleep_params), + &sleep_params, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + int err = PTR_ERR(skb); + bt_dev_err(hu->hdev, "Sleep VSC failed (%d)", err); + return err; + } + kfree_skb(skb); + + bt_dev_dbg(hu->hdev, "Set Sleep Parameters VSC succeeded"); + + return 0; +} +#else +static inline int bcm_request_irq(struct bcm_data *bcm) { return 0; } +static inline int bcm_setup_sleep(struct hci_uart *hu) { return 0; } +#endif + +static int bcm_set_diag(struct hci_dev *hdev, bool enable) +{ + struct hci_uart *hu = hci_get_drvdata(hdev); + struct bcm_data *bcm = hu->priv; + struct sk_buff *skb; + + if (!test_bit(HCI_RUNNING, &hdev->flags)) + return -ENETDOWN; + + skb = bt_skb_alloc(3, GFP_KERNEL); + if (!skb) + return -ENOMEM; + + skb_put_u8(skb, BCM_LM_DIAG_PKT); + skb_put_u8(skb, 0xf0); + skb_put_u8(skb, enable); + + skb_queue_tail(&bcm->txq, skb); + hci_uart_tx_wakeup(hu); + + return 0; +} + +static int bcm_open(struct hci_uart *hu) +{ + struct bcm_data *bcm; + struct list_head *p; + + bt_dev_dbg(hu->hdev, "hu %p", hu); + + bcm = kzalloc(sizeof(*bcm), GFP_KERNEL); + if (!bcm) + return -ENOMEM; + + skb_queue_head_init(&bcm->txq); + + hu->priv = bcm; + + /* If this is a serdev defined device, then only use + * serdev open primitive and skip the rest. + */ + if (hu->serdev) { + serdev_device_open(hu->serdev); + goto out; + } + + if (!hu->tty->dev) + goto out; + + mutex_lock(&bcm_device_lock); + list_for_each(p, &bcm_device_list) { + struct bcm_device *dev = list_entry(p, struct bcm_device, list); + + /* Retrieve saved bcm_device based on parent of the + * platform device (saved during device probe) and + * parent of tty device used by hci_uart + */ + if (hu->tty->dev->parent == dev->pdev->dev.parent) { + bcm->dev = dev; + hu->init_speed = dev->init_speed; + hu->oper_speed = dev->oper_speed; +#ifdef CONFIG_PM + dev->hu = hu; +#endif + bcm_gpio_set_power(bcm->dev, true); + break; + } + } + + mutex_unlock(&bcm_device_lock); +out: + return 0; +} + +static int bcm_close(struct hci_uart *hu) +{ + struct bcm_data *bcm = hu->priv; + struct bcm_device *bdev = bcm->dev; + + bt_dev_dbg(hu->hdev, "hu %p", hu); + + /* If this is a serdev defined device, only use serdev + * close primitive and then continue as usual. + */ + if (hu->serdev) + serdev_device_close(hu->serdev); + + /* Protect bcm->dev against removal of the device or driver */ + mutex_lock(&bcm_device_lock); + if (bcm_device_exists(bdev)) { + bcm_gpio_set_power(bdev, false); +#ifdef CONFIG_PM + pm_runtime_disable(&bdev->pdev->dev); + pm_runtime_set_suspended(&bdev->pdev->dev); + + if (device_can_wakeup(&bdev->pdev->dev)) { + devm_free_irq(&bdev->pdev->dev, bdev->irq, bdev); + device_init_wakeup(&bdev->pdev->dev, false); + } + + bdev->hu = NULL; +#endif + } + mutex_unlock(&bcm_device_lock); + + skb_queue_purge(&bcm->txq); + kfree_skb(bcm->rx_skb); + kfree(bcm); + + hu->priv = NULL; + return 0; +} + +static int bcm_flush(struct hci_uart *hu) +{ + struct bcm_data *bcm = hu->priv; + + bt_dev_dbg(hu->hdev, "hu %p", hu); + + skb_queue_purge(&bcm->txq); + + return 0; +} + +static int bcm_setup(struct hci_uart *hu) +{ + struct bcm_data *bcm = hu->priv; + char fw_name[64]; + const struct firmware *fw; + unsigned int speed; + int err; + + bt_dev_dbg(hu->hdev, "hu %p", hu); + + hu->hdev->set_diag = bcm_set_diag; + hu->hdev->set_bdaddr = btbcm_set_bdaddr; + + err = btbcm_initialize(hu->hdev, fw_name, sizeof(fw_name)); + if (err) + return err; + + err = request_firmware(&fw, fw_name, &hu->hdev->dev); + if (err < 0) { + bt_dev_info(hu->hdev, "BCM: Patch %s not found", fw_name); + return 0; + } + + err = btbcm_patchram(hu->hdev, fw); + if (err) { + bt_dev_info(hu->hdev, "BCM: Patch failed (%d)", err); + goto finalize; + } + + /* Init speed if any */ + if (hu->init_speed) + speed = hu->init_speed; + else if (hu->proto->init_speed) + speed = hu->proto->init_speed; + else + speed = 0; + + if (speed) + host_set_baudrate(hu, speed); + + /* Operational speed if any */ + if (hu->oper_speed) + speed = hu->oper_speed; + else if (hu->proto->oper_speed) + speed = hu->proto->oper_speed; + else + speed = 0; + + if (speed) { + err = bcm_set_baudrate(hu, speed); + if (!err) + host_set_baudrate(hu, speed); + } + +finalize: + release_firmware(fw); + + err = btbcm_finalize(hu->hdev); + if (err) + return err; + + if (!bcm_request_irq(bcm)) + err = bcm_setup_sleep(hu); + + return err; +} + +#define BCM_RECV_LM_DIAG \ + .type = BCM_LM_DIAG_PKT, \ + .hlen = BCM_LM_DIAG_SIZE, \ + .loff = 0, \ + .lsize = 0, \ + .maxlen = BCM_LM_DIAG_SIZE + +#define BCM_RECV_NULL \ + .type = BCM_NULL_PKT, \ + .hlen = BCM_NULL_SIZE, \ + .loff = 0, \ + .lsize = 0, \ + .maxlen = BCM_NULL_SIZE + +static const struct h4_recv_pkt bcm_recv_pkts[] = { + { H4_RECV_ACL, .recv = hci_recv_frame }, + { H4_RECV_SCO, .recv = hci_recv_frame }, + { H4_RECV_EVENT, .recv = hci_recv_frame }, + { BCM_RECV_LM_DIAG, .recv = hci_recv_diag }, + { BCM_RECV_NULL, .recv = hci_recv_diag }, +}; + +static int bcm_recv(struct hci_uart *hu, const void *data, int count) +{ + struct bcm_data *bcm = hu->priv; + + if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) + return -EUNATCH; + + bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count, + bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts)); + if (IS_ERR(bcm->rx_skb)) { + int err = PTR_ERR(bcm->rx_skb); + bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); + bcm->rx_skb = NULL; + return err; + } else if (!bcm->rx_skb) { + /* Delay auto-suspend when receiving completed packet */ + mutex_lock(&bcm_device_lock); + if (bcm->dev && bcm_device_exists(bcm->dev)) { + pm_runtime_get(&bcm->dev->pdev->dev); + pm_runtime_mark_last_busy(&bcm->dev->pdev->dev); + pm_runtime_put_autosuspend(&bcm->dev->pdev->dev); + } + mutex_unlock(&bcm_device_lock); + } + + return count; +} + +static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb) +{ + struct bcm_data *bcm = hu->priv; + + bt_dev_dbg(hu->hdev, "hu %p skb %p", hu, skb); + + /* Prepend skb with frame type */ + memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); + skb_queue_tail(&bcm->txq, skb); + + return 0; +} + +static struct sk_buff *bcm_dequeue(struct hci_uart *hu) +{ + struct bcm_data *bcm = hu->priv; + struct sk_buff *skb = NULL; + struct bcm_device *bdev = NULL; + + mutex_lock(&bcm_device_lock); + + if (bcm_device_exists(bcm->dev)) { + bdev = bcm->dev; + pm_runtime_get_sync(&bdev->pdev->dev); + /* Shall be resumed here */ + } + + skb = skb_dequeue(&bcm->txq); + + if (bdev) { + pm_runtime_mark_last_busy(&bdev->pdev->dev); + pm_runtime_put_autosuspend(&bdev->pdev->dev); + } + + mutex_unlock(&bcm_device_lock); + + return skb; +} + +#ifdef CONFIG_PM +static int bcm_suspend_device(struct device *dev) +{ + struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); + + bt_dev_dbg(bdev, ""); + + if (!bdev->is_suspended && bdev->hu) { + hci_uart_set_flow_control(bdev->hu, true); + + /* Once this returns, driver suspends BT via GPIO */ + bdev->is_suspended = true; + } + + /* Suspend the device */ + if (bdev->device_wakeup) { +#if LINUX_VERSION_IS_GEQ(3,13,0) + gpiod_set_value(bdev->device_wakeup, false); +#endif + bt_dev_dbg(bdev, "suspend, delaying 15 ms"); + mdelay(15); + } + + return 0; +} + +static int bcm_resume_device(struct device *dev) +{ + struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); + + bt_dev_dbg(bdev, ""); + + if (bdev->device_wakeup) { +#if LINUX_VERSION_IS_GEQ(3,13,0) + gpiod_set_value(bdev->device_wakeup, true); +#endif + bt_dev_dbg(bdev, "resume, delaying 15 ms"); + mdelay(15); + } + + /* When this executes, the device has woken up already */ + if (bdev->is_suspended && bdev->hu) { + bdev->is_suspended = false; + + hci_uart_set_flow_control(bdev->hu, false); + } + + return 0; +} +#endif + +#ifdef CONFIG_PM_SLEEP +/* Platform suspend callback */ +static int bcm_suspend(struct device *dev) +{ + struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); + int error; + + bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended); + + /* bcm_suspend can be called at any time as long as platform device is + * bound, so it should use bcm_device_lock to protect access to hci_uart + * and device_wake-up GPIO. + */ + mutex_lock(&bcm_device_lock); + + if (!bdev->hu) + goto unlock; + + if (pm_runtime_active(dev)) + bcm_suspend_device(dev); + + if (device_may_wakeup(&bdev->pdev->dev)) { + error = enable_irq_wake(bdev->irq); + if (!error) + bt_dev_dbg(bdev, "BCM irq: enabled"); + } + +unlock: + mutex_unlock(&bcm_device_lock); + + return 0; +} + +/* Platform resume callback */ +static int bcm_resume(struct device *dev) +{ + struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev)); + + bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended); + + /* bcm_resume can be called at any time as long as platform device is + * bound, so it should use bcm_device_lock to protect access to hci_uart + * and device_wake-up GPIO. + */ + mutex_lock(&bcm_device_lock); + + if (!bdev->hu) + goto unlock; + + if (device_may_wakeup(&bdev->pdev->dev)) { + disable_irq_wake(bdev->irq); + bt_dev_dbg(bdev, "BCM irq: disabled"); + } + + bcm_resume_device(dev); + +unlock: + mutex_unlock(&bcm_device_lock); + + pm_runtime_disable(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + return 0; +} +#endif + +#if defined(CONFIG_ACPI) && LINUX_VERSION_IS_GEQ(3,19,0) +static const struct acpi_gpio_params int_last_device_wakeup_gpios = { 0, 0, false }; +static const struct acpi_gpio_params int_last_shutdown_gpios = { 1, 0, false }; +static const struct acpi_gpio_params int_last_host_wakeup_gpios = { 2, 0, false }; + +static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { + { "device-wakeup-gpios", &int_last_device_wakeup_gpios, 1 }, + { "shutdown-gpios", &int_last_shutdown_gpios, 1 }, + { "host-wakeup-gpios", &int_last_host_wakeup_gpios, 1 }, + { }, +}; + +static const struct acpi_gpio_params int_first_host_wakeup_gpios = { 0, 0, false }; +static const struct acpi_gpio_params int_first_device_wakeup_gpios = { 1, 0, false }; +static const struct acpi_gpio_params int_first_shutdown_gpios = { 2, 0, false }; + +static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { + { "device-wakeup-gpios", &int_first_device_wakeup_gpios, 1 }, + { "shutdown-gpios", &int_first_shutdown_gpios, 1 }, + { "host-wakeup-gpios", &int_first_host_wakeup_gpios, 1 }, + { }, +}; + +static u8 acpi_active_low = ACPI_ACTIVE_LOW; + +/* IRQ polarity of some chipsets are not defined correctly in ACPI table. */ +static const struct dmi_system_id bcm_wrong_irq_dmi_table[] = { + { + .ident = "Asus T100TA", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, + "ASUSTeK COMPUTER INC."), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"), + }, + .driver_data = &acpi_active_low, + }, + { + .ident = "Asus T100CHI", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, + "ASUSTeK COMPUTER INC."), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"), + }, + .driver_data = &acpi_active_low, + }, + { /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */ + .ident = "Lenovo ThinkPad 8", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "ThinkPad 8"), + }, + .driver_data = &acpi_active_low, + }, + { } +}; + +static int bcm_resource(struct acpi_resource *ares, void *data) +{ + struct bcm_device *dev = data; + struct acpi_resource_extended_irq *irq; + struct acpi_resource_gpio *gpio; + struct acpi_resource_uart_serialbus *sb; + + switch (ares->type) { + case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: + irq = &ares->data.extended_irq; + dev->irq_polarity = irq->polarity; + break; + + case ACPI_RESOURCE_TYPE_GPIO: + gpio = &ares->data.gpio; + if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) + dev->irq_polarity = gpio->polarity; + break; + + case ACPI_RESOURCE_TYPE_SERIAL_BUS: + sb = &ares->data.uart_serial_bus; + if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) { + dev->init_speed = sb->default_baud_rate; + dev->oper_speed = 4000000; + } + break; + + default: + break; + } + + /* Always tell the ACPI core to skip this resource */ + return 1; +} +#endif /* CONFIG_ACPI */ + +static int bcm_platform_probe(struct bcm_device *dev) +{ + struct platform_device *pdev = dev->pdev; + + dev->name = dev_name(&pdev->dev); + + dev->clk = devm_clk_get(&pdev->dev, NULL); + + dev->device_wakeup = devm_gpiod_get_optional(&pdev->dev, + "device-wakeup", + GPIOD_OUT_LOW); + if (IS_ERR(dev->device_wakeup)) + return PTR_ERR(dev->device_wakeup); + + dev->shutdown = devm_gpiod_get_optional(&pdev->dev, "shutdown", + GPIOD_OUT_LOW); + if (IS_ERR(dev->shutdown)) + return PTR_ERR(dev->shutdown); + + /* IRQ can be declared in ACPI table as Interrupt or GpioInt */ + dev->irq = platform_get_irq(pdev, 0); + if (dev->irq <= 0) { + struct gpio_desc *gpio; + + gpio = devm_gpiod_get_optional(&pdev->dev, "host-wakeup", + GPIOD_IN); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + + dev->irq = gpiod_to_irq(gpio); + } + + dev_info(&pdev->dev, "BCM irq: %d\n", dev->irq); + + /* Make sure at-least one of the GPIO is defined and that + * a name is specified for this instance + */ + if ((!dev->device_wakeup && !dev->shutdown) || !dev->name) { + dev_err(&pdev->dev, "invalid platform data\n"); + return -EINVAL; + } + + return 0; +} + +#ifdef CONFIG_ACPI +static int bcm_acpi_probe(struct bcm_device *dev) +{ + struct platform_device *pdev = dev->pdev; + LIST_HEAD(resources); + const struct dmi_system_id *dmi_id; + const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios; + const struct acpi_device_id *id; + int ret; + + /* Retrieve GPIO data */ + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id) + gpio_mapping = (const struct acpi_gpio_mapping *) id->driver_data; + + ret = devm_acpi_dev_add_driver_gpios(&pdev->dev, gpio_mapping); + if (ret) + return ret; + + ret = bcm_platform_probe(dev); + if (ret) + return ret; + + /* Retrieve UART ACPI info */ + ret = acpi_dev_get_resources(ACPI_COMPANION(&dev->pdev->dev), + &resources, bcm_resource, dev); + if (ret < 0) + return ret; + acpi_dev_free_resource_list(&resources); + + dmi_id = dmi_first_match(bcm_wrong_irq_dmi_table); + if (dmi_id) { + bt_dev_warn(dev, "%s: Overwriting IRQ polarity to active low", + dmi_id->ident); + dev->irq_polarity = *(u8 *)dmi_id->driver_data; + } + + return 0; +} +#else +static int bcm_acpi_probe(struct bcm_device *dev) +{ + return -EINVAL; +} +#endif /* CONFIG_ACPI */ + +static int bcm_probe(struct platform_device *pdev) +{ + struct bcm_device *dev; + int ret; + + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + dev->pdev = pdev; + + if (has_acpi_companion(&pdev->dev)) + ret = bcm_acpi_probe(dev); + else + ret = bcm_platform_probe(dev); + if (ret) + return ret; + + platform_set_drvdata(pdev, dev); + + dev_info(&pdev->dev, "%s device registered.\n", dev->name); + + /* Place this instance on the device list */ + mutex_lock(&bcm_device_lock); + list_add_tail(&dev->list, &bcm_device_list); + mutex_unlock(&bcm_device_lock); + + bcm_gpio_set_power(dev, false); + + return 0; +} + +static int bcm_remove(struct platform_device *pdev) +{ + struct bcm_device *dev = platform_get_drvdata(pdev); + + mutex_lock(&bcm_device_lock); + list_del(&dev->list); + mutex_unlock(&bcm_device_lock); + + dev_info(&pdev->dev, "%s device unregistered.\n", dev->name); + + return 0; +} + +static const struct hci_uart_proto bcm_proto = { + .id = HCI_UART_BCM, + .name = "Broadcom", + .manufacturer = 15, + .init_speed = 115200, + .open = bcm_open, + .close = bcm_close, + .flush = bcm_flush, + .setup = bcm_setup, + .set_baudrate = bcm_set_baudrate, + .recv = bcm_recv, + .enqueue = bcm_enqueue, + .dequeue = bcm_dequeue, +}; + +#if defined(CONFIG_ACPI) && LINUX_VERSION_IS_GEQ(3,19,0) +static const struct acpi_device_id bcm_acpi_match[] = { + { "BCM2E1A", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E39", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E3A", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E3D", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E3F", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E40", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E54", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E55", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E64", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E65", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E67", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E71", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E7B", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E7C", (kernel_ulong_t)&acpi_bcm_int_last_gpios }, + { "BCM2E95", (kernel_ulong_t)&acpi_bcm_int_first_gpios }, + { "BCM2E96", (kernel_ulong_t)&acpi_bcm_int_first_gpios }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, bcm_acpi_match); +#endif + +/* Platform suspend and resume callbacks */ +static const struct dev_pm_ops bcm_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(bcm_suspend, bcm_resume) + SET_RUNTIME_PM_OPS(bcm_suspend_device, bcm_resume_device, NULL) +}; + +static struct platform_driver bcm_driver = { + .probe = bcm_probe, + .remove = bcm_remove, + .driver = { + .name = "hci_bcm", +#if LINUX_VERSION_IS_GEQ(3,19,0) + .acpi_match_table = ACPI_PTR(bcm_acpi_match), +#endif + .pm = &bcm_pm_ops, + }, +}; + +static int bcm_serdev_probe(struct serdev_device *serdev) +{ + struct bcm_serdev *bcmdev; + u32 speed; + int err; + + bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL); + if (!bcmdev) + return -ENOMEM; + + bcmdev->hu.serdev = serdev; + serdev_device_set_drvdata(serdev, bcmdev); + + err = device_property_read_u32(&serdev->dev, "max-speed", &speed); + if (!err) + bcmdev->hu.oper_speed = speed; + + return hci_uart_register_device(&bcmdev->hu, &bcm_proto); +} + +static void bcm_serdev_remove(struct serdev_device *serdev) +{ + struct bcm_serdev *bcmdev = serdev_device_get_drvdata(serdev); + + hci_uart_unregister_device(&bcmdev->hu); +} + +#ifdef CONFIG_OF +static const struct of_device_id bcm_bluetooth_of_match[] = { + { .compatible = "brcm,bcm43438-bt" }, + { }, +}; +MODULE_DEVICE_TABLE(of, bcm_bluetooth_of_match); +#endif + +static struct serdev_device_driver bcm_serdev_driver = { + .probe = bcm_serdev_probe, + .remove = bcm_serdev_remove, + .driver = { + .name = "hci_uart_bcm", + .of_match_table = of_match_ptr(bcm_bluetooth_of_match), + }, +}; + +int __init bcm_init(void) +{ + /* For now, we need to keep both platform device + * driver (ACPI generated) and serdev driver (DT). + */ + platform_driver_register(&bcm_driver); + serdev_device_driver_register(&bcm_serdev_driver); + + return hci_uart_register_proto(&bcm_proto); +} + +int __exit bcm_deinit(void) +{ + platform_driver_unregister(&bcm_driver); + serdev_device_driver_unregister(&bcm_serdev_driver); + + return hci_uart_unregister_proto(&bcm_proto); +} |