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Bluetooth: hci_intel: Add PM support 

Add PM suspend/resume callbacks which call lpm_suspend/resume.
Add LPM ack in threaded IRQ handler to notify the controller that
resume is complete.
Protect hci_uart against concurrent removing during suspend/resume.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Loic Poulain 2015-09-02 12:04:12 +02:00 committed by Marcel Holtmann
parent 894365468e
commit aa6802df09
1 changed files with 53 additions and 0 deletions
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53
drivers/bluetooth/hci_intel.c
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@ -68,6 +68,8 @@ struct intel_device {
struct list_head list; struct list_head list;
struct platform_device *pdev; struct platform_device *pdev;
struct gpio_desc *reset; struct gpio_desc *reset;
struct hci_uart *hu;
struct mutex hu_lock;
int irq; int irq;
}; };
@ -277,6 +279,11 @@ static irqreturn_t intel_irq(int irq, void *dev_id)
dev_info(&idev->pdev->dev, "hci_intel irq\n"); dev_info(&idev->pdev->dev, "hci_intel irq\n");
mutex_lock(&idev->hu_lock);
if (idev->hu)
intel_lpm_host_wake(idev->hu);
mutex_unlock(&idev->hu_lock);
return IRQ_HANDLED; return IRQ_HANDLED;
} }
@ -307,6 +314,15 @@ static int intel_set_power(struct hci_uart *hu, bool powered)
gpiod_set_value(idev->reset, powered); gpiod_set_value(idev->reset, powered);
/* Provide to idev a hu reference which is used to run LPM
* transactions (lpm suspend/resume) from PM callbacks.
* hu needs to be protected against concurrent removing during
* these PM ops.
*/
mutex_lock(&idev->hu_lock);
idev->hu = powered ? hu : NULL;
mutex_unlock(&idev->hu_lock);
if (idev->irq < 0) if (idev->irq < 0)
break; break;
@ -1087,6 +1103,40 @@ static int intel_acpi_probe(struct intel_device *idev)
} }
#endif #endif
#ifdef CONFIG_PM_SLEEP
static int intel_suspend(struct device *dev)
{
struct intel_device *idev = dev_get_drvdata(dev);
dev_dbg(dev, "intel_suspend");
mutex_lock(&idev->hu_lock);
if (idev->hu)
intel_lpm_suspend(idev->hu);
mutex_unlock(&idev->hu_lock);
return 0;
}
static int intel_resume(struct device *dev)
{
struct intel_device *idev = dev_get_drvdata(dev);
dev_dbg(dev, "intel_resume");
mutex_lock(&idev->hu_lock);
if (idev->hu)
intel_lpm_resume(idev->hu);
mutex_unlock(&idev->hu_lock);
return 0;
}
#endif
static const struct dev_pm_ops intel_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
};
static int intel_probe(struct platform_device *pdev) static int intel_probe(struct platform_device *pdev)
{ {
struct intel_device *idev; struct intel_device *idev;
@ -1095,6 +1145,8 @@ static int intel_probe(struct platform_device *pdev)
if (!idev) if (!idev)
return -ENOMEM; return -ENOMEM;
mutex_init(&idev->hu_lock);
idev->pdev = pdev; idev->pdev = pdev;
if (ACPI_HANDLE(&pdev->dev)) { if (ACPI_HANDLE(&pdev->dev)) {
@ -1171,6 +1223,7 @@ static struct platform_driver intel_driver = {
.driver = { .driver = {
.name = "hci_intel", .name = "hci_intel",
.acpi_match_table = ACPI_PTR(intel_acpi_match), .acpi_match_table = ACPI_PTR(intel_acpi_match),
.pm = &intel_pm_ops,
}, },
}; };