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Bluetooth: hci_bcm: Add suspend/resume PM functions

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Add reference to hci_uart structure to bcm_device.
This allows suspend/resume callbacks to manage UART flow control.

Signed-off-by: Frederic Danis <frederic.danis@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Frederic Danis 2015-08-11 16:35:38 +02:00 committed by Marcel Holtmann
parent ae05690886
commit 118612fb91
1 changed files with 66 additions and 1 deletions
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67
drivers/bluetooth/hci_bcm.c
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@ -51,6 +51,11 @@ struct bcm_device {
bool clk_enabled;
u32 init_speed;
#ifdef CONFIG_PM_SLEEP
struct hci_uart *hu;
bool is_suspended; /* suspend/resume flag */
#endif
};
struct bcm_data {
@ -170,6 +175,9 @@ static int bcm_open(struct hci_uart *hu)
if (hu->tty->dev->parent == dev->pdev->dev.parent) {
bcm->dev = dev;
hu->init_speed = dev->init_speed;
#ifdef CONFIG_PM_SLEEP
dev->hu = hu;
#endif
break;
}
}
@ -190,8 +198,12 @@ static int bcm_close(struct hci_uart *hu)
/* Protect bcm->dev against removal of the device or driver */
spin_lock(&bcm_device_list_lock);
if (bcm_device_exists(bcm->dev))
if (bcm_device_exists(bcm->dev)) {
bcm_gpio_set_power(bcm->dev, false);
#ifdef CONFIG_PM_SLEEP
bcm->dev->hu = NULL;
#endif
}
spin_unlock(&bcm_device_list_lock);
skb_queue_purge(&bcm->txq);
@ -318,6 +330,55 @@ static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
return skb_dequeue(&bcm->txq);
}
#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));
BT_DBG("suspend (%p): is_suspended %d", bdev, bdev->is_suspended);
if (!bdev->is_suspended) {
hci_uart_set_flow_control(bdev->hu, true);
/* Once this callback returns, driver suspends BT via GPIO */
bdev->is_suspended = true;
}
/* Suspend the device */
if (bdev->device_wakeup) {
gpiod_set_value(bdev->device_wakeup, false);
BT_DBG("suspend, delaying 15 ms");
mdelay(15);
}
return 0;
}
/* Platform resume callback */
static int bcm_resume(struct device *dev)
{
struct bcm_device *bdev = platform_get_drvdata(to_platform_device(dev));
BT_DBG("resume (%p): is_suspended %d", bdev, bdev->is_suspended);
if (bdev->device_wakeup) {
gpiod_set_value(bdev->device_wakeup, true);
BT_DBG("resume, delaying 15 ms");
mdelay(15);
}
/* When this callback executes, the device has woken up already */
if (bdev->is_suspended) {
bdev->is_suspended = false;
hci_uart_set_flow_control(bdev->hu, false);
}
return 0;
}
#endif
static const struct acpi_gpio_params device_wakeup_gpios = { 0, 0, false };
static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
@ -474,12 +535,16 @@ static const struct acpi_device_id bcm_acpi_match[] = {
MODULE_DEVICE_TABLE(acpi, bcm_acpi_match);
#endif
/* Platform suspend and resume callbacks */
static SIMPLE_DEV_PM_OPS(bcm_pm_ops, bcm_suspend, bcm_resume);
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,
},
};