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path: root/drivers/acpi/power.c
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Diffstat (limited to 'drivers/acpi/power.c')
-rw-r--r--drivers/acpi/power.c138
1 files changed, 102 insertions, 36 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 81e4f081a4a..4ab21cb1c8c 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -292,69 +292,135 @@ 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;
+ int i, err;
if (!dev || !dev->wakeup.flags.valid)
- return -1;
+ return -EINVAL;
+
+ /*
+ * Do not execute the code below twice in a row without calling
+ * acpi_disable_wakeup_device_power() in between for the same device
+ */
+ if (dev->wakeup.flags.prepared)
+ return 0;
- 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;
- }
+ /*
+ * Passing 3 as the third argument below means the device may be placed
+ * in arbitrary power state afterwards.
+ */
+ err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
+ if (!err)
+ dev->wakeup.flags.prepared = 1;
- return ret;
+ return err;
}
/*
* 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;
- }
+ /*
+ * Do not execute the code below twice in a row without calling
+ * acpi_enable_wakeup_device_power() in between for the same device
+ */
+ if (!dev->wakeup.flags.prepared)
+ return 0;
+
+ dev->wakeup.flags.prepared = 0;
+
+ 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 +428,7 @@ 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;
}
}