ACPI / scan: Treat power resources in a special way

ACPI power resources need to be treated in a special way by the
namespace scanning code, because they need to be ready to use as
soon as they have been discovered (even before registering ACPI
device nodes using them for power management).

For this reason, it doesn't make sense to separate the preparation
of struct acpi_device objects representing them in the device
hierarchy from the creation of struct acpi_power_resource objects
actually used for power resource manipulation.  Accordingly, it
doesn't make sense to define non-empty .add() and .remove() callbacks
in the power resources "driver" (in fact, it is questionable whether
or not it is useful to register such a "driver" at all).

Rearrange the code in scan.c and power.c so that power resources are
initialized entirely by one routine, acpi_add_power_resource(), that
also prepares their struct acpi_device objects and registers them
with the driver core, telling it to use a special release routine,
acpi_release_power_resource(), for removing objects that represent
power resources from memory.  Make the ACPI namespace scanning code
in scan.c always use acpi_add_power_resource() for preparing and
registering objects that represent power resources.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 72 insertions, 85 deletions

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 659386c..b12933f 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -58,8 +58,7 @@ ACPI_MODULE_NAME("power");
 #define ACPI_POWER_RESOURCE_STATE_ON	0x01
 #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
 
-static int acpi_power_add(struct acpi_device *device);
-static int acpi_power_remove(struct acpi_device *device, int type);
+static inline int acpi_power_add(struct acpi_device *device) { return 0; }
 
 static const struct acpi_device_id power_device_ids[] = {
 	{ACPI_POWER_HID, 0},
@@ -76,10 +75,7 @@ static struct acpi_driver acpi_power_driver = {
 	.name = "power",
 	.class = ACPI_POWER_CLASS,
 	.ids = power_device_ids,
-	.ops = {
-		.add = acpi_power_add,
-		.remove = acpi_power_remove,
-		},
+	.ops.add = acpi_power_add,
 	.drv.pm = &acpi_power_pm,
 };
 
@@ -90,9 +86,9 @@ struct acpi_power_dependent_device {
 };
 
 struct acpi_power_resource {
-	struct acpi_device *device;
+	struct acpi_device device;
 	struct list_head dependent;
-	acpi_bus_id name;
+	char *name;
 	u32 system_level;
 	u32 order;
 	unsigned int ref_count;
@@ -105,28 +101,14 @@ static struct list_head acpi_power_resource_list;
                              Power Resource Management
    -------------------------------------------------------------------------- */
 
-static int
-acpi_power_get_context(acpi_handle handle,
-		       struct acpi_power_resource **resource)
+static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
 {
-	int result = 0;
-	struct acpi_device *device = NULL;
-
-
-	if (!resource)
-		return -ENODEV;
-
-	result = acpi_bus_get_device(handle, &device);
-	if (result) {
-		printk(KERN_WARNING PREFIX "Getting context [%p]\n", handle);
-		return result;
-	}
+	struct acpi_device *device;
 
-	*resource = acpi_driver_data(device);
-	if (!*resource)
-		return -ENODEV;
+	if (acpi_bus_get_device(handle, &device))
+		return NULL;
 
-	return 0;
+	return container_of(device, struct acpi_power_resource, device);
 }
 
 static int acpi_power_get_state(acpi_handle handle, int *state)
@@ -171,9 +153,9 @@ static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
 		acpi_handle handle = list->handles[i];
 		int result;
 
-		result = acpi_power_get_context(handle, &resource);
-		if (result)
-			return result;
+		resource = acpi_power_get_context(handle);
+		if (!resource)
+			return -ENODEV;
 
 		mutex_lock(&resource->resource_lock);
 
@@ -226,12 +208,12 @@ static int __acpi_power_on(struct acpi_power_resource *resource)
 {
 	acpi_status status = AE_OK;
 
-	status = acpi_evaluate_object(resource->device->handle, "_ON", NULL, NULL);
+	status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
 
 	/* Update the power resource's _device_ power state */
-	resource->device->power.state = ACPI_STATE_D0;
+	resource->device.power.state = ACPI_STATE_D0;
 
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
 			  resource->name));
@@ -242,11 +224,11 @@ static int __acpi_power_on(struct acpi_power_resource *resource)
 static int acpi_power_on(acpi_handle handle)
 {
 	int result = 0;
-	struct acpi_power_resource *resource = NULL;
+	struct acpi_power_resource *resource;
 
-	result = acpi_power_get_context(handle, &resource);
-	if (result)
-		return result;
+	resource = acpi_power_get_context(handle);
+	if (!resource)
+		return -ENODEV;
 
 	mutex_lock(&resource->resource_lock);
 
@@ -275,11 +257,11 @@ static int acpi_power_off(acpi_handle handle)
 {
 	int result = 0;
 	acpi_status status = AE_OK;
-	struct acpi_power_resource *resource = NULL;
+	struct acpi_power_resource *resource;
 
-	result = acpi_power_get_context(handle, &resource);
-	if (result)
-		return result;
+	resource = acpi_power_get_context(handle);
+	if (!resource)
+		return -ENODEV;
 
 	mutex_lock(&resource->resource_lock);
 
@@ -297,12 +279,12 @@ static int acpi_power_off(acpi_handle handle)
 		goto unlock;
 	}
 
-	status = acpi_evaluate_object(resource->device->handle, "_OFF", NULL, NULL);
+	status = acpi_evaluate_object(resource->device.handle, "_OFF", NULL, NULL);
 	if (ACPI_FAILURE(status)) {
 		result = -ENODEV;
 	} else {
 		/* Update the power resource's _device_ power state */
-		resource->device->power.state = ACPI_STATE_D3;
+		resource->device.power.state = ACPI_STATE_D3;
 
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "Power resource [%s] turned off\n",
@@ -350,7 +332,11 @@ static void acpi_power_add_dependent(acpi_handle rhandle,
 	struct acpi_power_dependent_device *dep;
 	struct acpi_power_resource *resource;
 
-	if (!rhandle || !adev || acpi_power_get_context(rhandle, &resource))
+	if (!rhandle || !adev)
+		return;
+
+	resource = acpi_power_get_context(rhandle);
+	if (!resource)
 		return;
 
 	mutex_lock(&resource->resource_lock);
@@ -378,7 +364,11 @@ static void acpi_power_remove_dependent(acpi_handle rhandle,
 	struct acpi_power_resource *resource;
 	struct work_struct *work = NULL;
 
-	if (!rhandle || !adev || acpi_power_get_context(rhandle, &resource))
+	if (!rhandle || !adev)
+		return;
+
+	resource = acpi_power_get_context(rhandle);
+	if (!resource)
 		return;
 
 	mutex_lock(&resource->resource_lock);
@@ -648,46 +638,53 @@ int acpi_power_transition(struct acpi_device *device, int state)
 	return result;
 }
 
-/* --------------------------------------------------------------------------
-                                Driver Interface
-   -------------------------------------------------------------------------- */
+static void acpi_release_power_resource(struct device *dev)
+{
+	struct acpi_device *device = to_acpi_device(dev);
+	struct acpi_power_resource *resource;
+
+	acpi_free_ids(device);
+	resource = container_of(device, struct acpi_power_resource, device);
+	kfree(resource);
+}
 
-static int acpi_power_add(struct acpi_device *device)
+void acpi_add_power_resource(acpi_handle handle)
 {
-	int result = 0, state;
-	acpi_status status = AE_OK;
-	struct acpi_power_resource *resource = NULL;
+	struct acpi_power_resource *resource;
+	struct acpi_device *device = NULL;
 	union acpi_object acpi_object;
 	struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
+	acpi_status status;
+	int state, result = -ENODEV;
 
+	acpi_bus_get_device(handle, &device);
+	if (device)
+		return;
 
-	if (!device)
-		return -EINVAL;
-
-	resource = kzalloc(sizeof(struct acpi_power_resource), GFP_KERNEL);
+	resource = kzalloc(sizeof(*resource), GFP_KERNEL);
 	if (!resource)
-		return -ENOMEM;
+		return;
 
-	resource->device = device;
+	device = &resource->device;
+	acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
+				ACPI_STA_DEFAULT);
 	mutex_init(&resource->resource_lock);
 	INIT_LIST_HEAD(&resource->dependent);
-	strcpy(resource->name, device->pnp.bus_id);
+	resource->name = device->pnp.bus_id;
 	strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
-	device->driver_data = resource;
 
 	/* Evalute the object to get the system level and resource order. */
-	status = acpi_evaluate_object(device->handle, NULL, NULL, &buffer);
-	if (ACPI_FAILURE(status)) {
-		result = -ENODEV;
-		goto end;
-	}
+	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+	if (ACPI_FAILURE(status))
+		goto out;
+
 	resource->system_level = acpi_object.power_resource.system_level;
 	resource->order = acpi_object.power_resource.resource_order;
 
-	result = acpi_power_get_state(device->handle, &state);
+	result = acpi_power_get_state(handle, &state);
 	if (result)
-		goto end;
+		goto out;
 
 	switch (state) {
 	case ACPI_POWER_RESOURCE_STATE_ON:
@@ -698,34 +695,24 @@ static int acpi_power_add(struct acpi_device *device)
 		break;
 	default:
 		device->power.state = ACPI_STATE_UNKNOWN;
-		break;
 	}
 
 	printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
 	       acpi_device_bid(device), state ? "on" : "off");
 
-      end:
+	device->flags.match_driver = true;
+	result = acpi_device_register(device, acpi_release_power_resource);
+
+ out:
 	if (result)
-		kfree(resource);
+		acpi_release_power_resource(&device->dev);
 
-	return result;
+	return;
 }
 
-static int acpi_power_remove(struct acpi_device *device, int type)
-{
-	struct acpi_power_resource *resource;
-
-	if (!device)
-		return -EINVAL;
-
-	resource = acpi_driver_data(device);
-	if (!resource)
-		return -EINVAL;
-
-	kfree(resource);
-
-	return 0;
-}
+/* --------------------------------------------------------------------------
+                                Driver Interface
+   -------------------------------------------------------------------------- */
 
 #ifdef CONFIG_PM_SLEEP
 static int acpi_power_resume(struct device *dev)