Several platforms provide GPE information about devices in ACPI, but provide
no ACPI methods to handle these at runtime. Provide a default handler for
this case and bind it to PCI devices as they're discovered in ACPI space.
Keep the methods associated in case they have side effects.
Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx>
---
drivers/acpi/pci_bind.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 86 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/pci_bind.c b/drivers/acpi/pci_bind.c
index 2ef0409..8b3cc6a 100644
--- a/drivers/acpi/pci_bind.c
+++ b/drivers/acpi/pci_bind.c
@@ -28,6 +28,7 @@
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/acpi.h>
+#include <linux/list.h>
#include <linux/pm_runtime.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@@ -35,6 +36,43 @@
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_bind");
+static LIST_HEAD(acpi_pci_gpe_devs);
+
+struct pci_gpe_dev {
+ struct list_head node;
+ struct pci_dev *dev;
+ acpi_handle gpe_device;
+ int gpe_number;
+ struct work_struct work;
+};
+
+static void acpi_pci_wake_handler_work(struct work_struct *work)
+{
+ struct pci_gpe_dev *gpe_dev = container_of(work, struct pci_gpe_dev,
+ work);
+
+ pci_check_pme_status(gpe_dev->dev);
+ pm_runtime_resume(&gpe_dev->dev->dev);
+ pci_wakeup_event(gpe_dev->dev);
+ if (gpe_dev->dev->subordinate)
+ pci_pme_wakeup_bus(gpe_dev->dev->subordinate);
+}
+
+static u32 acpi_pci_wake_handler(void *data)
+{
+ long gpe_number = (long) data;
+ struct pci_gpe_dev *gpe_dev;
+
+ list_for_each_entry(gpe_dev, &acpi_pci_gpe_devs, node) {
+ if (gpe_number != gpe_dev->gpe_number)
+ continue;
+
+ schedule_work(&gpe_dev->work);
+ }
+
+ return ACPI_INTERRUPT_HANDLED;
+}
+
static int acpi_pci_unbind(struct acpi_device *device)
{
struct pci_dev *dev;
@@ -43,6 +81,30 @@ static int acpi_pci_unbind(struct acpi_device *device)
if (!dev)
goto out;
+ if (device->wakeup.flags.valid) {
+ struct pci_gpe_dev *gpe_dev;
+ struct pci_gpe_dev *tmp;
+ int gpe_count = 0;
+ int gpe_number = device->wakeup.gpe_number;
+ acpi_handle gpe_device = device->wakeup.gpe_device;
+
+ list_for_each_entry_safe(gpe_dev, tmp, &acpi_pci_gpe_devs, node) {
+ if (gpe_dev->dev == dev) {
+ flush_work(&gpe_dev->work);
+ list_del(&gpe_dev->node);
+ kfree(gpe_dev);
+ } else if (gpe_dev->gpe_number == gpe_number &&
+ gpe_dev->gpe_device == gpe_device) {
+ gpe_count++;
+ }
+ }
+
+ if (gpe_count == 0) {
+ acpi_remove_gpe_handler(gpe_device, gpe_number,
+ &acpi_pci_wake_handler);
+ }
+ }
+
device_set_run_wake(&dev->dev, false);
pci_acpi_remove_pm_notifier(device);
@@ -71,6 +133,30 @@ static int acpi_pci_bind(struct acpi_device *device)
return 0;
pci_acpi_add_pm_notifier(device, dev);
+ if (device->wakeup.flags.valid) {
+ struct pci_gpe_dev *gpe_dev;
+ acpi_handle gpe_device = device->wakeup.gpe_device;
+ long gpe_number = device->wakeup.gpe_number;
+
+ gpe_dev = kmalloc(sizeof(struct pci_gpe_dev), GFP_KERNEL);
+ if (gpe_dev) {
+ gpe_dev->dev = dev;
+ gpe_dev->gpe_device = gpe_device;
+ gpe_dev->gpe_number = gpe_number;
+ INIT_WORK(&gpe_dev->work, acpi_pci_wake_handler_work);
+
+ acpi_install_gpe_handler(gpe_device, gpe_number,
+ ACPI_GPE_LEVEL_TRIGGERED,
+ &acpi_pci_wake_handler,
+ (void *)gpe_number,
+ true);
+ acpi_gpe_can_wake(device->wakeup.gpe_device,
+ device->wakeup.gpe_number);
+ device->wakeup.flags.run_wake = 1;
+ list_add_tail(&gpe_dev->node, &acpi_pci_gpe_devs);
+ }
+ }
+
if (device->wakeup.flags.run_wake)
device_set_run_wake(&dev->dev, true);
--
1.7.3.1
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