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Bluetooth: hci_intel: Retrieve host-wake IRQ 

An IRQ can be retrieved from the pdev resources. This irq will be used
in case of LPM suspend mode to wake-up the host and resume the link.
This resource can be declared as a GPIO-Interrupt which requires to be
converted into IRQ.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Loic Poulain 2015-08-29 13:38:18 +02:00 committed by Marcel Holtmann
parent 6f558b70fb
commit 765ea3abd1
1 changed files with 61 additions and 1 deletions
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62
drivers/bluetooth/hci_intel.c
View File

@ -31,6 +31,7 @@
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
@ -48,6 +49,7 @@ struct intel_device {
struct list_head list;
struct platform_device *pdev;
struct gpio_desc *reset;
int irq;
};
static LIST_HEAD(intel_device_list);
@ -113,6 +115,15 @@ static int intel_wait_booting(struct hci_uart *hu)
return err;
}
static irqreturn_t intel_irq(int irq, void *dev_id)
{
struct intel_device *idev = dev_id;
dev_info(&idev->pdev->dev, "hci_intel irq\n");
return IRQ_HANDLED;
}
static int intel_set_power(struct hci_uart *hu, bool powered)
{
struct list_head *p;
@ -139,6 +150,27 @@ static int intel_set_power(struct hci_uart *hu, bool powered)
hu, dev_name(&idev->pdev->dev), powered);
gpiod_set_value(idev->reset, powered);
if (idev->irq < 0)
break;
if (powered && device_can_wakeup(&idev->pdev->dev)) {
err = devm_request_threaded_irq(&idev->pdev->dev,
idev->irq, NULL,
intel_irq,
IRQF_ONESHOT,
"bt-host-wake", idev);
if (err) {
BT_ERR("hu %p, unable to allocate irq-%d",
hu, idev->irq);
break;
}
device_wakeup_enable(&idev->pdev->dev);
} else if (!powered && device_may_wakeup(&idev->pdev->dev)) {
devm_free_irq(&idev->pdev->dev, idev->irq, idev);
device_wakeup_disable(&idev->pdev->dev);
}
}
spin_unlock(&intel_device_list_lock);
@ -838,6 +870,31 @@ static int intel_probe(struct platform_device *pdev)
return PTR_ERR(idev->reset);
}
idev->irq = platform_get_irq(pdev, 0);
if (idev->irq < 0) {
struct gpio_desc *host_wake;
dev_err(&pdev->dev, "No IRQ, falling back to gpio-irq\n");
host_wake = devm_gpiod_get_optional(&pdev->dev, "host-wake",
GPIOD_IN);
if (IS_ERR(host_wake)) {
dev_err(&pdev->dev, "Unable to retrieve IRQ\n");
goto no_irq;
}
idev->irq = gpiod_to_irq(host_wake);
if (idev->irq < 0) {
dev_err(&pdev->dev, "No corresponding irq for gpio\n");
goto no_irq;
}
}
/* Only enable wake-up/irq when controller is powered */
device_set_wakeup_capable(&pdev->dev, true);
device_wakeup_disable(&pdev->dev);
no_irq:
platform_set_drvdata(pdev, idev);
/* Place this instance on the device list */
@ -845,7 +902,8 @@ static int intel_probe(struct platform_device *pdev)
list_add_tail(&idev->list, &intel_device_list);
spin_unlock(&intel_device_list_lock);
dev_info(&pdev->dev, "registered.\n");
dev_info(&pdev->dev, "registered, gpio(%d)/irq(%d).\n",
desc_to_gpio(idev->reset), idev->irq);
return 0;
}
@ -854,6 +912,8 @@ static int intel_remove(struct platform_device *pdev)
{
struct intel_device *idev = platform_get_drvdata(pdev);
device_wakeup_disable(&pdev->dev);
spin_lock(&intel_device_list_lock);
list_del(&idev->list);
spin_unlock(&intel_device_list_lock);