[PATCH] PNPACPI: add support for remote wakeup

Alan Stern
2010-06-07T20:50:20Z

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>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>

---

Len, this patch seems to have gotten lost in the shuffle, so I'm
submitting it again.

Alan Stern

Index: usb-2.6/include/linux/pnp.h
===================================================================
--- usb-2.6.orig/include/linux/pnp.h
+++ usb-2.6/include/linux/pnp.h
@@ -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);

Index: usb-2.6/drivers/pnp/core.c
===================================================================
--- usb-2.6.orig/drivers/pnp/core.c
+++ usb-2.6/drivers/pnp/core.c
@@ -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);
}

Index: usb-2.6/drivers/pnp/pnpacpi/core.c
===================================================================
--- usb-2.6.orig/drivers/pnp/pnpacpi/core.c
+++ usb-2.6/drivers/pnp/pnpacpi/core.c
@@ -121,17 +121,37 @@ static int pnpacpi_disable_resources(str
}

#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);
}

@@ -140,6 +160,8 @@ static int pnpacpi_resume(struct pnp_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
@@ -150,6 +172,7 @@ 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