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ACPI: Add .setup() and .cleanup() callbacks to struct acpi_bus_type

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Add two new callbacks,.setup() and .cleanup(), struct acpi_bus_type
and modify acpi_platform_notify() to call .setup() after executing
acpi_bind_one() successfully and acpi_platform_notify_remove() to
call .cleanup() before running acpi_unbind_one().  This will allow
the users of struct acpi_bus_type, PCI in particular, to specify
operations to be executed right after the given device has been
associated with a companion struct acpi_device and right before
it's going to be detached from that companion, respectively.

The main motivation is to be able to get rid of acpi_pci_bind()
and acpi_pci_unbind(), which are horrible horrible stuff.  [In short,
there are three problems with them: The way they populate the .bind()
and .unbind() callbacks of ACPI devices is rather less than
straightforward, they require special hotplug-specific paths to be
present in the ACPI namespace scanning code and by the time
acpi_pci_unbind() is called the PCI device object in question may
not exist any more.]

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Rafael J. Wysocki 2012-12-23 00:02:13 +01:00
parent 0cd6ac52b3
commit 11909ca1cf
2 changed files with 37 additions and 15 deletions
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50
drivers/acpi/glue.c
View File

@ -63,6 +63,9 @@ static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
{
struct acpi_bus_type *tmp, *ret = NULL;
if (!type)
return NULL;
down_read(&bus_type_sem);
list_for_each_entry(tmp, &bus_type_list, list) {
if (tmp->bus == type) {
@ -264,28 +267,39 @@ static int acpi_platform_notify(struct device *dev)
{
struct acpi_bus_type *type;
acpi_handle handle;
int ret = -EINVAL;
int ret;
ret = acpi_bind_one(dev, NULL);
if (!ret)
goto out;
if (!dev->bus || !dev->parent) {
if (ret && (!dev->bus || !dev->parent)) {
/* bridge devices genernally haven't bus or parent */
ret = acpi_find_bridge_device(dev, &handle);
goto end;
if (!ret) {
ret = acpi_bind_one(dev, handle);
if (ret)
goto out;
}
}
type = acpi_get_bus_type(dev->bus);
if (!type) {
DBG("No ACPI bus support for %s\n", dev_name(dev));
ret = -EINVAL;
goto end;
if (ret) {
if (!type || !type->find_device) {
DBG("No ACPI bus support for %s\n", dev_name(dev));
ret = -EINVAL;
goto out;
}
ret = type->find_device(dev, &handle);
if (ret) {
DBG("Unable to get handle for %s\n", dev_name(dev));
goto out;
}
ret = acpi_bind_one(dev, handle);
if (ret)
goto out;
}
if ((ret = type->find_device(dev, &handle)) != 0)
DBG("Can't get handler for %s\n", dev_name(dev));
end:
if (!ret)
acpi_bind_one(dev, handle);
if (type && type->setup)
type->setup(dev);
out:
#if ACPI_GLUE_DEBUG
@ -304,6 +318,12 @@ static int acpi_platform_notify(struct device *dev)
static int acpi_platform_notify_remove(struct device *dev)
{
struct acpi_bus_type *type;
type = acpi_get_bus_type(dev->bus);
if (type && type->cleanup)
type->cleanup(dev);
acpi_unbind_one(dev);
return 0;
}

2
include/acpi/acpi_bus.h
View File

@ -383,6 +383,8 @@ struct acpi_bus_type {
int (*find_device) (struct device *, acpi_handle *);
/* For bridges, such as PCI root bridge, IDE controller */
int (*find_bridge) (struct device *, acpi_handle *);
void (*setup)(struct device *);
void (*cleanup)(struct device *);
};
int register_acpi_bus_type(struct acpi_bus_type *);
int unregister_acpi_bus_type(struct acpi_bus_type *);