From 41a2a4665d401f79912a3da83ff9ef3e502bc12e Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Thu, 11 Apr 2013 22:41:48 +0200
Subject: ACPI / PM: Expose lists of device wakeup power resources to user
 space

Commit 18a3870 (ACPI / PM: Expose lists of device power resources
to user space) exposed the lists of ACPI power resources associated
with power states of ACPI devices, but it didn't expose the lists
of ACPI wakeup power resources, which also is necessary to get the
full picture of dependencies between ACPI devices and power
resources.

For this reason, for every ACPI device node having a list of ACPI
wakeup power resources associated with it, expose that list to user
space in analogy with commit 18a3870.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/power.c | 58 +++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 39 insertions(+), 19 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 34f5ef11d427..0e3f57674fd1 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -459,57 +459,79 @@ static struct attribute_group attr_groups[] = {
 	},
 };
 
-static void acpi_power_hide_list(struct acpi_device *adev, int state)
+static struct attribute_group wakeup_attr_group = {
+	.name = "power_resources_wakeup",
+	.attrs = attrs,
+};
+
+static void acpi_power_hide_list(struct acpi_device *adev,
+				 struct list_head *resources,
+				 struct attribute_group *attr_group)
 {
-	struct acpi_device_power_state *ps = &adev->power.states[state];
 	struct acpi_power_resource_entry *entry;
 
-	if (list_empty(&ps->resources))
+	if (list_empty(resources))
 		return;
 
-	list_for_each_entry_reverse(entry, &ps->resources, node) {
+	list_for_each_entry_reverse(entry, resources, node) {
 		struct acpi_device *res_dev = &entry->resource->device;
 
 		sysfs_remove_link_from_group(&adev->dev.kobj,
-					     attr_groups[state].name,
+					     attr_group->name,
 					     dev_name(&res_dev->dev));
 	}
-	sysfs_remove_group(&adev->dev.kobj, &attr_groups[state]);
+	sysfs_remove_group(&adev->dev.kobj, attr_group);
 }
 
-static void acpi_power_expose_list(struct acpi_device *adev, int state)
+static void acpi_power_expose_list(struct acpi_device *adev,
+				   struct list_head *resources,
+				   struct attribute_group *attr_group)
 {
-	struct acpi_device_power_state *ps = &adev->power.states[state];
 	struct acpi_power_resource_entry *entry;
 	int ret;
 
-	if (list_empty(&ps->resources))
+	if (list_empty(resources))
 		return;
 
-	ret = sysfs_create_group(&adev->dev.kobj, &attr_groups[state]);
+	ret = sysfs_create_group(&adev->dev.kobj, attr_group);
 	if (ret)
 		return;
 
-	list_for_each_entry(entry, &ps->resources, node) {
+	list_for_each_entry(entry, resources, node) {
 		struct acpi_device *res_dev = &entry->resource->device;
 
 		ret = sysfs_add_link_to_group(&adev->dev.kobj,
-					      attr_groups[state].name,
+					      attr_group->name,
 					      &res_dev->dev.kobj,
 					      dev_name(&res_dev->dev));
 		if (ret) {
-			acpi_power_hide_list(adev, state);
+			acpi_power_hide_list(adev, resources, attr_group);
 			break;
 		}
 	}
 }
 
+static void acpi_power_expose_hide(struct acpi_device *adev,
+				   struct list_head *resources,
+				   struct attribute_group *attr_group,
+				   bool expose)
+{
+	if (expose)
+		acpi_power_expose_list(adev, resources, attr_group);
+	else
+		acpi_power_hide_list(adev, resources, attr_group);
+}
+
 void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
 {
 	struct acpi_device_power_state *ps;
 	struct acpi_power_resource_entry *entry;
 	int state;
 
+	if (adev->wakeup.flags.valid)
+		acpi_power_expose_hide(adev, &adev->wakeup.resources,
+				       &wakeup_attr_group, add);
+
 	if (!adev->power.flags.power_resources)
 		return;
 
@@ -523,12 +545,10 @@ void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
 			acpi_power_remove_dependent(resource, adev);
 	}
 
-	for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++) {
-		if (add)
-			acpi_power_expose_list(adev, state);
-		else
-			acpi_power_hide_list(adev, state);
-	}
+	for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
+		acpi_power_expose_hide(adev,
+				       &adev->power.states[state].resources,
+				       &attr_groups[state], add);
 }
 
 int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
-- 
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