vserver 1.9.3

[linux-2.6.git] / drivers / acpi / power.c

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 657ddef..4c3d2a7 100644 (file)
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -288,6 +288,86 @@ acpi_power_off_device (
        return_VALUE(0);
 }
 
+/*
+ * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
+ * 1. Power on the power resources required for the wakeup device 
+ * 2. Enable _PSW (power state wake) for the device if present
+ */
+int acpi_enable_wakeup_device_power (struct acpi_device *dev)
+{
+       union acpi_object               arg = {ACPI_TYPE_INTEGER};
+       struct acpi_object_list arg_list = {1, &arg};
+       acpi_status                     status = AE_OK;
+       int                                     i;
+       int                                     ret = 0;
+
+       ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_power");
+       if (!dev || !dev->wakeup.flags.valid)
+               return -1;
+
+       arg.integer.value = 1;
+       /* Open power resource */
+       for (i = 0; i < dev->wakeup.resources.count; i++) {
+               ret = acpi_power_on(dev->wakeup.resources.handles[i]);
+               if (ret) {
+                       ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
+                               "Error transition power state\n"));
+                       dev->wakeup.flags.valid = 0;
+                       return -1;
+               }
+       }
+
+       /* Execute PSW */
+       status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
+       if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+               ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n"));
+               dev->wakeup.flags.valid = 0;
+               ret = -1;
+       }
+
+       return ret;
+}
+
+/*
+ * Shutdown a wakeup device, counterpart of above method
+ * 1. Disable _PSW (power state wake)
+ * 2. Shutdown down the power resources
+ */
+int acpi_disable_wakeup_device_power (struct acpi_device *dev)
+{
+       union acpi_object               arg = {ACPI_TYPE_INTEGER};
+       struct acpi_object_list arg_list = {1, &arg};
+       acpi_status                     status = AE_OK;
+       int                                     i;
+       int                                     ret = 0;
+
+       ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device_power");
+
+       if (!dev || !dev->wakeup.flags.valid)
+               return -1;
+
+       arg.integer.value = 0;  
+       /* Execute PSW */
+       status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
+       if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+               ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluate _PSW\n"));
+               dev->wakeup.flags.valid = 0;
+               return -1;
+       }
+
+       /* Close power resource */
+       for (i = 0; i < dev->wakeup.resources.count; i++) {
+               ret = acpi_power_off_device(dev->wakeup.resources.handles[i]);
+               if (ret) {
+                       ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
+                               "Error transition power state\n"));
+                       dev->wakeup.flags.valid = 0;
+                       return -1;
+               }
+       }
+
+       return ret;
+}
 
 /* --------------------------------------------------------------------------
                              Device Power Management