X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Facpi%2Fpower.c;h=4c3d2a7d2e961e1a8a3110fd2e26987665e7840b;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=657ddef48239f259b7b1a3c9d4470e5f027b11c9;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 657ddef48..4c3d2a7d2 100644
--- 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