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linux/linux-5.18.11/drivers/bluetooth/hci_bcm.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Bluetooth HCI UART driver for Broadcom devices
*
* Copyright (C) 2015 Intel Corporation
*/
#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/of_irq.h>
#include <linux/property.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#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_TYPE49_PKT 0x31
#define BCM_TYPE49_SIZE 0
#define BCM_TYPE52_PKT 0x34
#define BCM_TYPE52_SIZE 0
#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
#define BCM_NUM_SUPPLIES 2
/**
* struct bcm_device_data - device specific data
* @no_early_set_baudrate: Disallow set baudrate before driver setup()
* @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
*/
struct bcm_device_data {
bool no_early_set_baudrate;
bool drive_rts_on_open;
};
/**
* struct bcm_device - device driver resources
* @serdev_hu: HCI UART controller struct
* @list: bcm_device_list node
* @dev: physical UART slave
* @name: device name logged by bt_dev_*() functions
* @device_wakeup: BT_WAKE pin,
* assert = Bluetooth device must wake up or remain awake,
* deassert = Bluetooth device may sleep when sleep criteria are met
* @shutdown: BT_REG_ON pin,
* power up or power down Bluetooth device internal regulators
* @reset: BT_RST_N pin,
* active low resets the Bluetooth logic core
* @set_device_wakeup: callback to toggle BT_WAKE pin
* either by accessing @device_wakeup or by calling @btlp
* @set_shutdown: callback to toggle BT_REG_ON pin
* either by accessing @shutdown or by calling @btpu/@btpd
* @btlp: Apple ACPI method to toggle BT_WAKE pin ("Bluetooth Low Power")
* @btpu: Apple ACPI method to drive BT_REG_ON pin high ("Bluetooth Power Up")
* @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
* @gpio_count: internal counter for GPIO resources associated with ACPI device
* @gpio_int_idx: index in _CRS for GpioInt() resource
* @txco_clk: external reference frequency clock used by Bluetooth device
* @lpo_clk: external LPO clock used by Bluetooth device
* @supplies: VBAT and VDDIO supplies used by Bluetooth device
* @res_enabled: whether clocks and supplies are prepared and enabled
* @init_speed: default baudrate of Bluetooth device;
* the host UART is initially set to this baudrate so that
* it can configure the Bluetooth device for @oper_speed
* @oper_speed: preferred baudrate of Bluetooth device;
* set to 0 if @init_speed is already the preferred baudrate
* @irq: interrupt triggered by HOST_WAKE_BT pin
* @irq_active_low: whether @irq is active low
* @irq_acquired: flag to show if IRQ handler has been assigned
* @hu: pointer to HCI UART controller struct,
* used to disable flow control during runtime suspend and system sleep
* @is_suspended: whether flow control is currently disabled
* @no_early_set_baudrate: don't set_baudrate before setup()
* @drive_rts_on_open: drive RTS signal on ->open() when platform requires it
* @pcm_int_params: keep the initial PCM configuration
*/
struct bcm_device {
/* Must be the first member, hci_serdev.c expects this. */
struct hci_uart serdev_hu;
struct list_head list;
struct device *dev;
const char *name;
struct gpio_desc *device_wakeup;
struct gpio_desc *shutdown;
struct gpio_desc *reset;
int (*set_device_wakeup)(struct bcm_device *, bool);
int (*set_shutdown)(struct bcm_device *, bool);
#ifdef CONFIG_ACPI
acpi_handle btlp, btpu, btpd;
int gpio_count;
int gpio_int_idx;
#endif
struct clk *txco_clk;
struct clk *lpo_clk;
struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
bool res_enabled;
u32 init_speed;
u32 oper_speed;
int irq;
bool irq_active_low;
bool irq_acquired;
#ifdef CONFIG_PM
struct hci_uart *hu;
bool is_suspended;
#endif
bool no_early_set_baudrate;
bool drive_rts_on_open;
u8 pcm_int_params[5];
};
/* 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 int irq_polarity = -1;
module_param(irq_polarity, int, 0444);
MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low");
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), &param,
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;
#ifdef CONFIG_PM
/* Devices using serdev always exist */
if (device && device->hu && device->hu->serdev)
return true;
#endif
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)
{
int err;
if (powered && !dev->res_enabled) {
/* Intel Macs use bcm_apple_get_resources() and don't
* have regulator supplies configured.
*/
if (dev->supplies[0].supply) {
err = regulator_bulk_enable(BCM_NUM_SUPPLIES,
dev->supplies);
if (err)
return err;
}
/* LPO clock needs to be 32.768 kHz */
err = clk_set_rate(dev->lpo_clk, 32768);
if (err) {
dev_err(dev->dev, "Could not set LPO clock rate\n");
goto err_regulator_disable;
}
err = clk_prepare_enable(dev->lpo_clk);
if (err)
goto err_regulator_disable;
err = clk_prepare_enable(dev->txco_clk);
if (err)
goto err_lpo_clk_disable;
}
err = dev->set_shutdown(dev, powered);
if (err)
goto err_txco_clk_disable;
err = dev->set_device_wakeup(dev, powered);
if (err)
goto err_revert_shutdown;
if (!powered && dev->res_enabled) {
clk_disable_unprepare(dev->txco_clk);
clk_disable_unprepare(dev->lpo_clk);
/* Intel Macs use bcm_apple_get_resources() and don't
* have regulator supplies configured.
*/
if (dev->supplies[0].supply)
regulator_bulk_disable(BCM_NUM_SUPPLIES,
dev->supplies);
}
/* wait for device to power on and come out of reset */
usleep_range(100000, 120000);
dev->res_enabled = powered;
return 0;
err_revert_shutdown:
dev->set_shutdown(dev, !powered);
err_txco_clk_disable:
if (powered && !dev->res_enabled)
clk_disable_unprepare(dev->txco_clk);
err_lpo_clk_disable:
if (powered && !dev->res_enabled)
clk_disable_unprepare(dev->lpo_clk);
err_regulator_disable:
if (powered && !dev->res_enabled)
regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
return err;
}
#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->dev);
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return IRQ_HANDLED;
}
static int bcm_request_irq(struct bcm_data *bcm)
{
struct bcm_device *bdev = bcm->dev;
int err;
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->dev, bdev->irq, bcm_host_wake,
bdev->irq_active_low ? IRQF_TRIGGER_FALLING :
IRQF_TRIGGER_RISING,
"host_wake", bdev);
if (err) {
bdev->irq = err;
goto unlock;
}
bdev->irq_acquired = true;
device_init_wakeup(bdev->dev, true);
pm_runtime_set_autosuspend_delay(bdev->dev,
BCM_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(bdev->dev);
pm_runtime_set_active(bdev->dev);
pm_runtime_enable(bdev->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,
.break_to_host = 0,
.pulsed_host_wake = 1,
};
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_active_low;
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;
int err;
bt_dev_dbg(hu->hdev, "hu %p", hu);
if (!hci_uart_has_flow_control(hu))
return -EOPNOTSUPP;
bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
if (!bcm)
return -ENOMEM;
skb_queue_head_init(&bcm->txq);
hu->priv = bcm;
mutex_lock(&bcm_device_lock);
if (hu->serdev) {
bcm->dev = serdev_device_get_drvdata(hu->serdev);
goto out;
}
if (!hu->tty->dev)
goto out;
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->dev->parent) {
bcm->dev = dev;
#ifdef CONFIG_PM
dev->hu = hu;
#endif
break;
}
}
out:
if (bcm->dev) {
if (bcm->dev->drive_rts_on_open)
hci_uart_set_flow_control(hu, true);
hu->init_speed = bcm->dev->init_speed;
/* If oper_speed is set, ldisc/serdev will set the baudrate
* before calling setup()
*/
if (!bcm->dev->no_early_set_baudrate)
hu->oper_speed = bcm->dev->oper_speed;
err = bcm_gpio_set_power(bcm->dev, true);
if (bcm->dev->drive_rts_on_open)
hci_uart_set_flow_control(hu, false);
if (err)
goto err_unset_hu;
}
mutex_unlock(&bcm_device_lock);
return 0;
err_unset_hu:
#ifdef CONFIG_PM
if (!hu->serdev)
bcm->dev->hu = NULL;
#endif
mutex_unlock(&bcm_device_lock);
hu->priv = NULL;
kfree(bcm);
return err;
}
static int bcm_close(struct hci_uart *hu)
{
struct bcm_data *bcm = hu->priv;
struct bcm_device *bdev = NULL;
int err;
bt_dev_dbg(hu->hdev, "hu %p", hu);
/* Protect bcm->dev against removal of the device or driver */
mutex_lock(&bcm_device_lock);
if (hu->serdev) {
bdev = serdev_device_get_drvdata(hu->serdev);
} else if (bcm_device_exists(bcm->dev)) {
bdev = bcm->dev;
#ifdef CONFIG_PM
bdev->hu = NULL;
#endif
}
if (bdev) {
if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
devm_free_irq(bdev->dev, bdev->irq, bdev);
device_init_wakeup(bdev->dev, false);
pm_runtime_disable(bdev->dev);
}
err = bcm_gpio_set_power(bdev, false);
if (err)
bt_dev_err(hu->hdev, "Failed to power down");
else
pm_runtime_set_suspended(bdev->dev);
}
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;
bool fw_load_done = false;
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_load_done);
if (err)
return err;
if (!fw_load_done)
return 0;
/* 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 (bcm->dev && bcm->dev->oper_speed)
speed = bcm->dev->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);
}
/* PCM parameters if provided */
if (bcm->dev && bcm->dev->pcm_int_params[0] != 0xff) {
struct bcm_set_pcm_int_params params;
btbcm_read_pcm_int_params(hu->hdev, &params);
memcpy(&params, bcm->dev->pcm_int_params, 5);
btbcm_write_pcm_int_params(hu->hdev, &params);
}
err = btbcm_finalize(hu->hdev, &fw_load_done);
if (err)
return err;
/* Some devices ship with the controller default address.
* Allow the bootloader to set a valid address through the
* device tree.
*/
set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hu->hdev->quirks);
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
#define BCM_RECV_TYPE49 \
.type = BCM_TYPE49_PKT, \
.hlen = BCM_TYPE49_SIZE, \
.loff = 0, \
.lsize = 0, \
.maxlen = BCM_TYPE49_SIZE
#define BCM_RECV_TYPE52 \
.type = BCM_TYPE52_PKT, \
.hlen = BCM_TYPE52_SIZE, \
.loff = 0, \
.lsize = 0, \
.maxlen = BCM_TYPE52_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 },
{ H4_RECV_ISO, .recv = hci_recv_frame },
{ BCM_RECV_LM_DIAG, .recv = hci_recv_diag },
{ BCM_RECV_NULL, .recv = hci_recv_diag },
{ BCM_RECV_TYPE49, .recv = hci_recv_diag },
{ BCM_RECV_TYPE52, .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->dev);
pm_runtime_mark_last_busy(bcm->dev->dev);
pm_runtime_put_autosuspend(bcm->dev->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->dev);
/* Shall be resumed here */
}
skb = skb_dequeue(&bcm->txq);
if (bdev) {
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
}
mutex_unlock(&bcm_device_lock);
return skb;
}
#ifdef CONFIG_PM
static int bcm_suspend_device(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int err;
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 */
err = bdev->set_device_wakeup(bdev, false);
if (err) {
if (bdev->is_suspended && bdev->hu) {
bdev->is_suspended = false;
hci_uart_set_flow_control(bdev->hu, false);
}
return -EBUSY;
}
bt_dev_dbg(bdev, "suspend, delaying 15 ms");
msleep(15);
return 0;
}
static int bcm_resume_device(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int err;
bt_dev_dbg(bdev, "");
err = bdev->set_device_wakeup(bdev, true);
if (err) {
dev_err(dev, "Failed to power up\n");
return err;
}
bt_dev_dbg(bdev, "resume, delaying 15 ms");
msleep(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
/* suspend callback */
static int bcm_suspend(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int error;
bt_dev_dbg(bdev, "suspend: is_suspended %d", bdev->is_suspended);
/*
* When used with a device instantiated as platform_device, bcm_suspend
* can be called at any time as long as the 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(dev) && bdev->irq > 0) {
error = enable_irq_wake(bdev->irq);
if (!error)
bt_dev_dbg(bdev, "BCM irq: enabled");
}
unlock:
mutex_unlock(&bcm_device_lock);
return 0;
}
/* resume callback */
static int bcm_resume(struct device *dev)
{
struct bcm_device *bdev = dev_get_drvdata(dev);
int err = 0;
bt_dev_dbg(bdev, "resume: is_suspended %d", bdev->is_suspended);
/*
* When used with a device instantiated as platform_device, 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(dev) && bdev->irq > 0) {
disable_irq_wake(bdev->irq);
bt_dev_dbg(bdev, "BCM irq: disabled");
}
err = bcm_resume_device(dev);
unlock:
mutex_unlock(&bcm_device_lock);
if (!err) {
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
}
return 0;
}
#endif
/* Some firmware reports an IRQ which does not work (wrong pin in fw table?) */
static struct gpiod_lookup_table asus_tf103c_irq_gpios = {
.dev_id = "serial0-0",
.table = {
GPIO_LOOKUP("INT33FC:02", 17, "host-wakeup-alt", GPIO_ACTIVE_HIGH),
{ }
},
};
static const struct dmi_system_id bcm_broken_irq_dmi_table[] = {
{
.ident = "Asus TF103C",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
},
.driver_data = &asus_tf103c_irq_gpios,
},
{
.ident = "Meegopad T08",
.matches = {
DMI_EXACT_MATCH(DMI_BOARD_VENDOR,
"To be filled by OEM."),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "T3 MRD"),
DMI_EXACT_MATCH(DMI_BOARD_VERSION, "V1.1"),
},
},
{ }
};
#ifdef CONFIG_ACPI
static const struct acpi_gpio_params first_gpio = { 0, 0, false };
static const struct acpi_gpio_params second_gpio = { 1, 0, false };
static const struct acpi_gpio_params third_gpio = { 2, 0, false };
static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = {
{ "device-wakeup-gpios", &first_gpio, 1 },
{ "shutdown-gpios", &second_gpio, 1 },
{ "host-wakeup-gpios", &third_gpio, 1 },
{ },
};
static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
{ "host-wakeup-gpios", &first_gpio, 1 },
{ "device-wakeup-gpios", &second_gpio, 1 },
{ "shutdown-gpios", &third_gpio, 1 },
{ },
};
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;
if (irq->polarity != ACPI_ACTIVE_LOW)
dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
dev->irq_active_low = true;
break;
case ACPI_RESOURCE_TYPE_GPIO:
gpio = &ares->data.gpio;
if (gpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT) {
dev->gpio_int_idx = dev->gpio_count;
dev->irq_active_low = gpio->polarity == ACPI_ACTIVE_LOW;
}
dev->gpio_count++;
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;
}
return 0;
}
static int bcm_apple_set_device_wakeup(struct bcm_device *dev, bool awake)
{
if (ACPI_FAILURE(acpi_execute_simple_method(dev->btlp, NULL, !awake)))
return -EIO;
return 0;
}
static int bcm_apple_set_shutdown(struct bcm_device *dev, bool powered)
{
if (ACPI_FAILURE(acpi_evaluate_object(powered ? dev->btpu : dev->btpd,
NULL, NULL, NULL)))
return -EIO;
return 0;
}
static int bcm_apple_get_resources(struct bcm_device *dev)
{
struct acpi_device *adev = ACPI_COMPANION(dev->dev);
const union acpi_object *obj;
if (!adev ||
ACPI_FAILURE(acpi_get_handle(adev->handle, "BTLP", &dev->btlp)) ||
ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPU", &dev->btpu)) ||
ACPI_FAILURE(acpi_get_handle(adev->handle, "BTPD", &dev->btpd)))
return -ENODEV;
if (!acpi_dev_get_property(adev, "baud", ACPI_TYPE_BUFFER, &obj) &&
obj->buffer.length == 8)
dev->init_speed = *(u64 *)obj->buffer.pointer;
dev->set_device_wakeup = bcm_apple_set_device_wakeup;
dev->set_shutdown = bcm_apple_set_shutdown;
return 0;
}
#else
static inline int bcm_apple_get_resources(struct bcm_device *dev)
{
return -EOPNOTSUPP;
}
#endif /* CONFIG_ACPI */
static int bcm_gpio_set_device_wakeup(struct bcm_device *dev, bool awake)
{
gpiod_set_value_cansleep(dev->device_wakeup, awake);
return 0;
}
static int bcm_gpio_set_shutdown(struct bcm_device *dev, bool powered)
{
gpiod_set_value_cansleep(dev->shutdown, powered);
if (dev->reset)
/*
* The reset line is asserted on powerdown and deasserted
* on poweron so the inverse of powered is used. Notice
* that the GPIO line BT_RST_N needs to be specified as
* active low in the device tree or similar system
* description.
*/
gpiod_set_value_cansleep(dev->reset, !powered);
return 0;
}
/* Try a bunch of names for TXCO */
static struct clk *bcm_get_txco(struct device *dev)
{
struct clk *clk;
/* New explicit name */
clk = devm_clk_get(dev, "txco");
if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
return clk;
/* Deprecated name */
clk = devm_clk_get(dev, "extclk");
if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
return clk;
/* Original code used no name at all */
return devm_clk_get(dev, NULL);
}
static int bcm_get_resources(struct bcm_device *dev)
{
const struct dmi_system_id *broken_irq_dmi_id;
const char *irq_con_id = "host-wakeup";
int err;
dev->name = dev_name(dev->dev);
if (x86_apple_machine && !bcm_apple_get_resources(dev))
return 0;
dev->txco_clk = bcm_get_txco(dev->dev);
/* Handle deferred probing */
if (dev->txco_clk == ERR_PTR(-EPROBE_DEFER))
return PTR_ERR(dev->txco_clk);
/* Ignore all other errors as before */
if (IS_ERR(dev->txco_clk))
dev->txco_clk = NULL;
dev->lpo_clk = devm_clk_get(dev->dev, "lpo");
if (dev->lpo_clk == ERR_PTR(-EPROBE_DEFER))
return PTR_ERR(dev->lpo_clk);
if (IS_ERR(dev->lpo_clk))
dev->lpo_clk = NULL;
/* Check if we accidentally fetched the lpo clock twice */
if (dev->lpo_clk && clk_is_match(dev->lpo_clk, dev->txco_clk)) {
devm_clk_put(dev->dev, dev->txco_clk);
dev->txco_clk = NULL;
}
dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
GPIOD_OUT_LOW);
if (IS_ERR(dev->device_wakeup))
return PTR_ERR(dev->device_wakeup);
dev->shutdown = devm_gpiod_get_optional(dev->dev, "shutdown",
GPIOD_OUT_LOW);
if (IS_ERR(dev->shutdown))
return PTR_ERR(dev->shutdown);
dev->reset = devm_gpiod_get_optional(dev->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(dev->reset))
return PTR_ERR(dev->reset);
dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
dev->set_shutdown = bcm_gpio_set_shutdown;
dev->supplies[0].supply = "vbat";
dev->supplies[1].supply = "vddio";
err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
dev->supplies);
if (err)
return err;
broken_irq_dmi_id = dmi_first_match(bcm_broken_irq_dmi_table);
if (broken_irq_dmi_id && broken_irq_dmi_id->driver_data) {
gpiod_add_lookup_table(broken_irq_dmi_id->driver_data);
irq_con_id = "host-wakeup-alt";
dev->irq_active_low = false;
dev->irq = 0;
}
/* IRQ can be declared in ACPI table as Interrupt or GpioInt */
if (dev->irq <= 0) {
struct gpio_desc *gpio;
gpio = devm_gpiod_get_optional(dev->dev, irq_con_id, GPIOD_IN);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
dev->irq = gpiod_to_irq(gpio);
}
if (broken_irq_dmi_id) {
if (broken_irq_dmi_id->driver_data) {
gpiod_remove_lookup_table(broken_irq_dmi_id->driver_data);
} else {
dev_info(dev->dev, "%s: Has a broken IRQ config, disabling IRQ support / runtime-pm\n",
broken_irq_dmi_id->ident);
dev->irq = 0;
}
}
dev_dbg(dev->dev, "BCM irq: %d\n", dev->irq);
return 0;
}
#ifdef CONFIG_ACPI
static int bcm_acpi_probe(struct bcm_device *dev)
{
LIST_HEAD(resources);
const struct acpi_gpio_mapping *gpio_mapping = acpi_bcm_int_last_gpios;
struct resource_entry *entry;
int ret;
/* Retrieve UART ACPI info */
dev->gpio_int_idx = -1;
ret = acpi_dev_get_resources(ACPI_COMPANION(dev->dev),
&resources, bcm_resource, dev);
if (ret < 0)
return ret;
resource_list_for_each_entry(entry, &resources) {
if (resource_type(entry->res) == IORESOURCE_IRQ) {
dev->irq = entry->res->start;
break;
}
}
acpi_dev_free_resource_list(&resources);
/* If the DSDT uses an Interrupt resource for the IRQ, then there are
* only 2 GPIO resources, we use the irq-last mapping for this, since
* we already have an irq the 3th / last mapping will not be used.
*/
if (dev->irq)
gpio_mapping = acpi_bcm_int_last_gpios;
else if (dev->gpio_int_idx == 0)
gpio_mapping = acpi_bcm_int_first_gpios;
else if (dev->gpio_int_idx == 2)
gpio_mapping = acpi_bcm_int_last_gpios;
else
dev_warn(dev->dev, "Unexpected ACPI gpio_int_idx: %d\n",
dev->gpio_int_idx);
/* Warn if our expectations are not met. */
if (dev->gpio_count != (dev->irq ? 2 : 3))
dev_warn(dev->dev, "Unexpected number of ACPI GPIOs: %d\n",
dev->gpio_count);
ret = devm_acpi_dev_add_driver_gpios(dev->dev, gpio_mapping);
if (ret)
return ret;
if (irq_polarity != -1) {
dev->irq_active_low = irq_polarity;
dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n",
dev->irq_active_low ? "low" : "high");
}
return 0;
}
#else
static int bcm_acpi_probe(struct bcm_device *dev)
{
return -EINVAL;
}
#endif /* CONFIG_ACPI */
static int bcm_of_probe(struct bcm_device *bdev)
{
device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
device_property_read_u8_array(bdev->dev, "brcm,bt-pcm-int-params",
bdev->pcm_int_params, 5);
bdev->irq = of_irq_get_byname(bdev->dev->of_node, "host-wakeup");
bdev->irq_active_low = irq_get_trigger_type(bdev->irq)
& (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW);
return 0;
}
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->dev = &pdev->dev;
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
dev->irq = ret;
/* Initialize routing field to an unused value */
dev->pcm_int_params[0] = 0xff;
if (has_acpi_companion(&pdev->dev)) {
ret = bcm_acpi_probe(dev);
if (ret)
return ret;
}
ret = bcm_get_resources(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);
ret = bcm_gpio_set_power(dev, false);
if (ret)
dev_err(&pdev->dev, "Failed to power down\n");
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,
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id bcm_acpi_match[] = {
{ "BCM2E00" },
{ "BCM2E01" },
{ "BCM2E02" },
{ "BCM2E03" },
{ "BCM2E04" },
{ "BCM2E05" },
{ "BCM2E06" },
{ "BCM2E07" },
{ "BCM2E08" },
{ "BCM2E09" },
{ "BCM2E0A" },
{ "BCM2E0B" },
{ "BCM2E0C" },
{ "BCM2E0D" },
{ "BCM2E0E" },
{ "BCM2E0F" },
{ "BCM2E10" },
{ "BCM2E11" },
{ "BCM2E12" },
{ "BCM2E13" },
{ "BCM2E14" },
{ "BCM2E15" },
{ "BCM2E16" },
{ "BCM2E17" },
{ "BCM2E18" },
{ "BCM2E19" },
{ "BCM2E1A" },
{ "BCM2E1B" },
{ "BCM2E1C" },
{ "BCM2E1D" },
{ "BCM2E1F" },
{ "BCM2E20" },
{ "BCM2E21" },
{ "BCM2E22" },
{ "BCM2E23" },
{ "BCM2E24" },
{ "BCM2E25" },
{ "BCM2E26" },
{ "BCM2E27" },
{ "BCM2E28" },
{ "BCM2E29" },
{ "BCM2E2A" },
{ "BCM2E2B" },
{ "BCM2E2C" },
{ "BCM2E2D" },
{ "BCM2E2E" },
{ "BCM2E2F" },
{ "BCM2E30" },
{ "BCM2E31" },
{ "BCM2E32" },
{ "BCM2E33" },
{ "BCM2E34" },
{ "BCM2E35" },
{ "BCM2E36" },
{ "BCM2E37" },
{ "BCM2E38" },
{ "BCM2E39" },
{ "BCM2E3A" },
{ "BCM2E3B" },
{ "BCM2E3C" },
{ "BCM2E3D" },
{ "BCM2E3E" },
{ "BCM2E3F" },
{ "BCM2E40" },
{ "BCM2E41" },
{ "BCM2E42" },
{ "BCM2E43" },
{ "BCM2E44" },
{ "BCM2E45" },
{ "BCM2E46" },
{ "BCM2E47" },
{ "BCM2E48" },
{ "BCM2E49" },
{ "BCM2E4A" },
{ "BCM2E4B" },
{ "BCM2E4C" },
{ "BCM2E4D" },
{ "BCM2E4E" },
{ "BCM2E4F" },
{ "BCM2E50" },
{ "BCM2E51" },
{ "BCM2E52" },
{ "BCM2E53" },
{ "BCM2E54" },
{ "BCM2E55" },
{ "BCM2E56" },
{ "BCM2E57" },
{ "BCM2E58" },
{ "BCM2E59" },
{ "BCM2E5A" },
{ "BCM2E5B" },
{ "BCM2E5C" },
{ "BCM2E5D" },
{ "BCM2E5E" },
{ "BCM2E5F" },
{ "BCM2E60" },
{ "BCM2E61" },
{ "BCM2E62" },
{ "BCM2E63" },
{ "BCM2E64" },
{ "BCM2E65" },
{ "BCM2E66" },
{ "BCM2E67" },
{ "BCM2E68" },
{ "BCM2E69" },
{ "BCM2E6B" },
{ "BCM2E6D" },
{ "BCM2E6E" },
{ "BCM2E6F" },
{ "BCM2E70" },
{ "BCM2E71" },
{ "BCM2E72" },
{ "BCM2E73" },
{ "BCM2E74" },
{ "BCM2E75" },
{ "BCM2E76" },
{ "BCM2E77" },
{ "BCM2E78" },
{ "BCM2E79" },
{ "BCM2E7A" },
{ "BCM2E7B" },
{ "BCM2E7C" },
{ "BCM2E7D" },
{ "BCM2E7E" },
{ "BCM2E7F" },
{ "BCM2E80" },
{ "BCM2E81" },
{ "BCM2E82" },
{ "BCM2E83" },
{ "BCM2E84" },
{ "BCM2E85" },
{ "BCM2E86" },
{ "BCM2E87" },
{ "BCM2E88" },
{ "BCM2E89" },
{ "BCM2E8A" },
{ "BCM2E8B" },
{ "BCM2E8C" },
{ "BCM2E8D" },
{ "BCM2E8E" },
{ "BCM2E90" },
{ "BCM2E92" },
{ "BCM2E93" },
{ "BCM2E94" },
{ "BCM2E95" },
{ "BCM2E96" },
{ "BCM2E97" },
{ "BCM2E98" },
{ "BCM2E99" },
{ "BCM2E9A" },
{ "BCM2E9B" },
{ "BCM2E9C" },
{ "BCM2E9D" },
{ "BCM2EA0" },
{ "BCM2EA1" },
{ "BCM2EA2" },
{ "BCM2EA3" },
{ "BCM2EA4" },
{ "BCM2EA5" },
{ "BCM2EA6" },
{ "BCM2EA7" },
{ "BCM2EA8" },
{ "BCM2EA9" },
{ "BCM2EAA" },
{ "BCM2EAB" },
{ "BCM2EAC" },
{ },
};
MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
#endif
/* 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",
.acpi_match_table = ACPI_PTR(bcm_acpi_match),
.pm = &bcm_pm_ops,
},
};
static int bcm_serdev_probe(struct serdev_device *serdev)
{
struct bcm_device *bcmdev;
const struct bcm_device_data *data;
int err;
bcmdev = devm_kzalloc(&serdev->dev, sizeof(*bcmdev), GFP_KERNEL);
if (!bcmdev)
return -ENOMEM;
bcmdev->dev = &serdev->dev;
#ifdef CONFIG_PM
bcmdev->hu = &bcmdev->serdev_hu;
#endif
bcmdev->serdev_hu.serdev = serdev;
serdev_device_set_drvdata(serdev, bcmdev);
/* Initialize routing field to an unused value */
bcmdev->pcm_int_params[0] = 0xff;
if (has_acpi_companion(&serdev->dev))
err = bcm_acpi_probe(bcmdev);
else
err = bcm_of_probe(bcmdev);
if (err)
return err;
err = bcm_get_resources(bcmdev);
if (err)
return err;
if (!bcmdev->shutdown) {
dev_warn(&serdev->dev,
"No reset resource, using default baud rate\n");
bcmdev->oper_speed = bcmdev->init_speed;
}
err = bcm_gpio_set_power(bcmdev, false);
if (err)
dev_err(&serdev->dev, "Failed to power down\n");
data = device_get_match_data(bcmdev->dev);
if (data) {
bcmdev->no_early_set_baudrate = data->no_early_set_baudrate;
bcmdev->drive_rts_on_open = data->drive_rts_on_open;
}
return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
}
static void bcm_serdev_remove(struct serdev_device *serdev)
{
struct bcm_device *bcmdev = serdev_device_get_drvdata(serdev);
hci_uart_unregister_device(&bcmdev->serdev_hu);
}
#ifdef CONFIG_OF
static struct bcm_device_data bcm4354_device_data = {
.no_early_set_baudrate = true,
};
static struct bcm_device_data bcm43438_device_data = {
.drive_rts_on_open = true,
};
static const struct of_device_id bcm_bluetooth_of_match[] = {
{ .compatible = "brcm,bcm20702a1" },
{ .compatible = "brcm,bcm4329-bt" },
{ .compatible = "brcm,bcm4330-bt" },
{ .compatible = "brcm,bcm4334-bt" },
{ .compatible = "brcm,bcm4345c5" },
{ .compatible = "brcm,bcm43430a0-bt" },
{ .compatible = "brcm,bcm43430a1-bt" },
{ .compatible = "brcm,bcm43438-bt", .data = &bcm43438_device_data },
{ .compatible = "brcm,bcm43540-bt", .data = &bcm4354_device_data },
{ .compatible = "brcm,bcm4335a0" },
{ },
};
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),
.acpi_match_table = ACPI_PTR(bcm_acpi_match),
.pm = &bcm_pm_ops,
},
};
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);
}
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