Fix forcedeth hibernate/wake-on-lan problems

This patch is the minimal amount of code needed to support
wake-on-lan in platform mode properly (i.e. "ethtool -s eth0 wol g"
is sufficient, no additional magic needed) for me.

This is derived from David Brownells patch
(http://lists.laptop.org/pipermail/devel/2007-April/004691.html).
However I decided to move the hook into pci-acpi.c since the other
two pci hooks also live there and pci and acpi are the only users of
the platform_enable_wakeup-hook.

As a 'side-effect' this also makes wake on usb activity work for me
and I had to disable usb wakeup (which is enabled by default) using
the power/wakeup sysfs functionality ("echo disabled >
${sysfs_path_to_device}/power/wakeup").

(BTW I first thought the 'immediate reboot because of usb wake' effect is
caused by the optical mouse generating a wake event, but it rather
seems to be a problem with a flaky secondary usb host controller,
which sees a connected device where nothing is attached)

Signed-off-by: Tobias Diedrich <ranma+kernel@tdiedrich.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 9d6fc8e6285d..f7904ff2ace0 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -315,6 +315,25 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev,
         }
         return PCI_POWER_ERROR;
 }
+
+static int acpi_platform_enable_wakeup(struct device *dev, int is_on)
+{
+        struct acpi_device      *adev;
+        int                     status;
+
+        if (!device_can_wakeup(dev))
+                return -EINVAL;
+
+        if (is_on && !device_may_wakeup(dev))
+                return -EINVAL;
+
+        status = acpi_bus_get_device(DEVICE_ACPI_HANDLE(dev), &adev);
+        if (status < 0)
+                return status;
+
+        adev->wakeup.state.enabled = !!is_on;
+        return 0;
+}
 #endif
 
 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
@@ -399,6 +418,7 @@ static int __init acpi_pci_init(void)
                 return 0;
 #ifdef  CONFIG_ACPI_SLEEP
         platform_pci_choose_state = acpi_pci_choose_state;
+        platform_enable_wakeup = acpi_platform_enable_wakeup;
 #endif
         platform_pci_set_power_state = acpi_pci_set_power_state;
         return 0;