Added acpi_lookup_driver(), which looks up an associated driver
for the notified ACPI device object by walking through the list
of ACPI drivers.
Signed-off-by: Toshi Kani <toshi.kani@xxxxxx>
---
drivers/acpi/scan.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 2 +
2 files changed, 67 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index d1ecca2..d0e0d18 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1630,3 +1630,68 @@ int __init acpi_scan_init(void)
return result;
}
+
+static int acpi_match_driver(struct device_driver *drv, void *data)
+{
+ struct acpi_driver *driver = to_acpi_driver(drv);
+ struct acpi_device *device = (struct acpi_device *) data;
+ int ret;
+
+ ret = acpi_match_device_ids(device, driver->ids);
+ if (!ret)
+ device->driver = driver;
+
+ return !ret;
+}
+
+/**
+ * acpi_lookup_driver: Look up a driver for the notified ACPI device
+ * @handle: ACPI handle of the notified device object
+ * @event: Notify event
+ *
+ * Look up an associated driver for the notified ACPI device object
+ * by walking through the list of ACPI drivers.
+ */
+struct acpi_driver *acpi_lookup_driver(acpi_handle handle, u32 event)
+{
+ struct acpi_device *device;
+ struct acpi_driver *driver = NULL;
+ unsigned long long sta;
+ int type;
+ int ret;
+
+ /* allocate a temporary device object */
+ device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
+ if (!device) {
+ pr_err(PREFIX "No memory to allocate a tmp device\n");
+ return NULL;
+ }
+
+ ret = acpi_bus_type_and_status(handle, &type, &sta);
+ if (ret) {
+ pr_err(PREFIX "Failed to get type of device\n");
+ goto out;
+ }
+
+ /* setup this temporary device object */
+ INIT_LIST_HEAD(&device->pnp.ids);
+ device->device_type = type;
+ device->handle = handle;
+ device->parent = acpi_bus_get_parent(handle);
+ device->dev.bus = &acpi_bus_type;
+ device->driver = NULL;
+ STRUCT_TO_INT(device->status) = sta;
+ device->status.present = 1;
+
+ /* set HID to this device object */
+ acpi_device_set_id(device);
+
+ /* lookup a matching driver */
+ (void) bus_for_each_drv(device->dev.bus, NULL,
+ device, acpi_match_driver);
+ driver = device->driver;
+
+out:
+ kfree(device);
+ return driver;
+}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index bde976e..a773b46 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -345,6 +345,8 @@ extern int unregister_acpi_notifier(struct notifier_block *);
extern int register_acpi_bus_notifier(struct notifier_block *nb);
extern void unregister_acpi_bus_notifier(struct notifier_block *nb);
+extern struct acpi_driver *acpi_lookup_driver(acpi_handle handle, u32 event);
+
/*
* External Functions
*/
--
1.7.7.6
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