ACPI: Introduce acpi_device_sleep_wake function

The currect ACPI code attempts to execute _PSW at three different
places and in one of them only it tries to execute _DSW before _PSW,
which is inconsistent with the other two cases.

Move the execution of _DSW and _PSW into a separate function called
acpi_device_sleep_wake() and call it wherever appropriate instead of
executing _DSW and/or _PSW directly.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 82 insertions, 36 deletions

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 81e4f081a4ae..2e959aa1ef0e 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -292,69 +292,115 @@ static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
         return 0;
 }
 
+/**
+ * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
+ *                          ACPI 3.0) _PSW (Power State Wake)
+ * @dev: Device to handle.
+ * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
+ * @sleep_state: Target sleep state of the system.
+ * @dev_state: Target power state of the device.
+ *
+ * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ * State Wake) for the device, if present.  On failure reset the device's
+ * wakeup.flags.valid flag.
+ *
+ * RETURN VALUE:
+ * 0 if either _DSW or _PSW has been successfully executed
+ * 0 if neither _DSW nor _PSW has been found
+ * -ENODEV if the execution of either _DSW or _PSW has failed
+ */
+int acpi_device_sleep_wake(struct acpi_device *dev,
+                           int enable, int sleep_state, int dev_state)
+{
+        union acpi_object in_arg[3];
+        struct acpi_object_list arg_list = { 3, in_arg };
+        acpi_status status = AE_OK;
+
+        /*
+         * Try to execute _DSW first.
+         *
+         * Three agruments are needed for the _DSW object:
+         * Argument 0: enable/disable the wake capabilities
+         * Argument 1: target system state
+         * Argument 2: target device state
+         * When _DSW object is called to disable the wake capabilities, maybe
+         * the first argument is filled. The values of the other two agruments
+         * are meaningless.
+         */
+        in_arg[0].type = ACPI_TYPE_INTEGER;
+        in_arg[0].integer.value = enable;
+        in_arg[1].type = ACPI_TYPE_INTEGER;
+        in_arg[1].integer.value = sleep_state;
+        in_arg[2].type = ACPI_TYPE_INTEGER;
+        in_arg[2].integer.value = dev_state;
+        status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
+        if (ACPI_SUCCESS(status)) {
+                return 0;
+        } else if (status != AE_NOT_FOUND) {
+                printk(KERN_ERR PREFIX "_DSW execution failed\n");
+                dev->wakeup.flags.valid = 0;
+                return -ENODEV;
+        }
+
+        /* Execute _PSW */
+        arg_list.count = 1;
+        in_arg[0].integer.value = enable;
+        status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
+        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+                printk(KERN_ERR PREFIX "_PSW execution failed\n");
+                dev->wakeup.flags.valid = 0;
+                return -ENODEV;
+        }
+
+        return 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
+ * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ *    State Wake) for the device, if present
  */
-int acpi_enable_wakeup_device_power(struct acpi_device *dev)
+int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
 {
-        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;
 
         if (!dev || !dev->wakeup.flags.valid)
-                return -1;
+                return -EINVAL;
 
-        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], dev);
+                int ret = acpi_power_on(dev->wakeup.resources.handles[i], dev);
                 if (ret) {
                         printk(KERN_ERR PREFIX "Transition power state\n");
                         dev->wakeup.flags.valid = 0;
-                        return -1;
+                        return -ENODEV;
                 }
         }
 
-        /* Execute PSW */
-        status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
-        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
-                printk(KERN_ERR PREFIX "Evaluate _PSW\n");
-                dev->wakeup.flags.valid = 0;
-                ret = -1;
-        }
-
-        return ret;
+        /*
+         * Passing 3 as the third argument below means the device may be placed
+         * in arbitrary power state afterwards.
+         */
+        return acpi_device_sleep_wake(dev, 1, sleep_state, 3);
 }
 
 /*
  * Shutdown a wakeup device, counterpart of above method
- * 1. Disable _PSW (power state wake)
+ * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ *    State Wake) for the device, if present
  * 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;
-
+        int i, ret;
 
         if (!dev || !dev->wakeup.flags.valid)
-                return -1;
+                return -EINVAL;
 
-        arg.integer.value = 0;
-        /* Execute PSW */
-        status = acpi_evaluate_object(dev->handle, "_PSW", &arg_list, NULL);
-        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
-                printk(KERN_ERR PREFIX "Evaluate _PSW\n");
-                dev->wakeup.flags.valid = 0;
-                return -1;
-        }
+        ret = acpi_device_sleep_wake(dev, 0, 0, 0);
+        if (ret)
+                return ret;
 
         /* Close power resource */
         for (i = 0; i < dev->wakeup.resources.count; i++) {
@@ -362,7 +408,7 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
                 if (ret) {
                         printk(KERN_ERR PREFIX "Transition power state\n");
                         dev->wakeup.flags.valid = 0;
-                        return -1;
+                        return -ENODEV;
                 }
         }