Commit b14e033e authored by Alan Stern's avatar Alan Stern Committed by Rafael J. Wysocki
Browse files

PNPACPI: Add support for remote wakeup 



This patch (as1354) adds remote-wakeup support to the pnpacpi driver.
The new can_wakeup method also allows other PNP protocol drivers
(pnpbios or iaspnp) to add wakeup support, but I don't know enough
about how they work to actually do it.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Reviewed-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 2430d12c

drivers/pnp/core.c

+3 −0
Original line number Diff line number Diff line
@@ -164,6 +164,9 @@ int __pnp_add_device(struct pnp_dev *dev) 
	list_add_tail(&dev->global_list, &pnp_global);

	list_add_tail(&dev->protocol_list, &dev->protocol->devices);

	spin_unlock(&pnp_lock);

	if (dev->protocol->can_wakeup)

		device_set_wakeup_capable(&dev->dev,

				dev->protocol->can_wakeup(dev));

	return device_register(&dev->dev);

}

drivers/pnp/pnpacpi/core.c

+23 −0
Original line number Diff line number Diff line
@@ -122,17 +122,37 @@ static int pnpacpi_disable_resources(struct pnp_dev *dev) 
}



#ifdef CONFIG_ACPI_SLEEP

static bool pnpacpi_can_wakeup(struct pnp_dev *dev)

{

	struct acpi_device *acpi_dev = dev->data;

	acpi_handle handle = acpi_dev->handle;



	return acpi_bus_can_wakeup(handle);

}



static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)

{

	struct acpi_device *acpi_dev = dev->data;

	acpi_handle handle = acpi_dev->handle;

	int power_state;



	if (device_can_wakeup(&dev->dev)) {

		int rc = acpi_pm_device_sleep_wake(&dev->dev,

				device_may_wakeup(&dev->dev));



		if (rc)

			return rc;

	}

	power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);

	if (power_state < 0)

		power_state = (state.event == PM_EVENT_ON) ?

				ACPI_STATE_D0 : ACPI_STATE_D3;



	/* acpi_bus_set_power() often fails (keyboard port can't be

	 * powered-down?), and in any case, our return value is ignored

	 * by pnp_bus_suspend().  Hence we don't revert the wakeup

	 * setting if the set_power fails.

	 */

	return acpi_bus_set_power(handle, power_state);

}
@@ -141,6 +161,8 @@ static int pnpacpi_resume(struct pnp_dev *dev) 
	struct acpi_device *acpi_dev = dev->data;

	acpi_handle handle = acpi_dev->handle;



	if (device_may_wakeup(&dev->dev))

		acpi_pm_device_sleep_wake(&dev->dev, false);

	return acpi_bus_set_power(handle, ACPI_STATE_D0);

}

#endif
@@ -151,6 +173,7 @@ struct pnp_protocol pnpacpi_protocol = { 
	.set	 = pnpacpi_set_resources,

	.disable = pnpacpi_disable_resources,

#ifdef CONFIG_ACPI_SLEEP

	.can_wakeup = pnpacpi_can_wakeup,

	.suspend = pnpacpi_suspend,

	.resume = pnpacpi_resume,

#endif

include/linux/pnp.h

+1 −0
Original line number Diff line number Diff line
@@ -414,6 +414,7 @@ struct pnp_protocol { 
	int (*disable) (struct pnp_dev *dev);



	/* protocol specific suspend/resume */

	bool (*can_wakeup) (struct pnp_dev *dev);

	int (*suspend) (struct pnp_dev * dev, pm_message_t state);

	int (*resume) (struct pnp_dev * dev);

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