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ACPI: Use GPE reference counting to support shared GPEs

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ACPI GPEs may map to multiple devices.  The current GPE interface
only provides a mechanism for enabling and disabling GPEs, making
it difficult to change the state of GPEs at runtime without extensive
cooperation between devices.

Add an API to allow devices to indicate whether or not they want
their device's GPE to be enabled for both runtime and wakeup events.

Remove the old GPE type handling entirely, which gets rid of various
quirks, like the implicit disabling with GPE type setting. This
requires a small amount of rework in order to ensure that non-wake
GPEs are enabled by default to preserve existing behaviour.

Based on patches from Matthew Garrett <mjg@redhat.com>.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Rafael J. Wysocki
2010-02-17 23:41:07 +01:00
committed by Jesse Barnes
parent c39fae1416
commit 9630bdd9b1
13 changed files with 189 additions and 326 deletions
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15
drivers/acpi/sleep.c
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@@ -745,9 +745,18 @@ int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
return -ENODEV;
}
error = enable ?
acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
acpi_disable_wakeup_device_power(adev);
if (enable) {
error = acpi_enable_wakeup_device_power(adev,
acpi_target_sleep_state);
if (!error)
acpi_enable_gpe(adev->wakeup.gpe_device,
adev->wakeup.gpe_number,
ACPI_GPE_TYPE_WAKE);
} else {
acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number,
ACPI_GPE_TYPE_WAKE);
error = acpi_disable_wakeup_device_power(adev);
}
if (!error)
dev_info(dev, "wake-up capability %s by ACPI\n",
enable ? "enabled" : "disabled");