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PNPACPI: Add support for remote wakeup

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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: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Alan Stern 2010-06-29 22:49:24 +02:00 committed by Rafael J. Wysocki
parent 2430d12c94
commit b14e033e17
3 changed files with 27 additions and 0 deletions
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3
drivers/pnp/core.c
View file

@ -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);
}

23
drivers/pnp/pnpacpi/core.c
View file

@ -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

1
include/linux/pnp.h
View file

@ -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);