ACPI / scan: .match() callback for ACPI scan handlers

Introduce a .match() callback for ACPI scan handlers to allow them to
use more elaborate matching algorithms if necessary.  That is needed
for the upcoming PNP scan handler in particular.

This change is based on a Zhang Rui's prototype.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index df6e4c924b35..e44438f7917b 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1977,6 +1977,9 @@ static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
 {
         const struct acpi_device_id *devid;
 
+        if (handler->match)
+                return handler->match(idstr, matchid);
+
         for (devid = handler->ids; devid->id[0]; devid++)
                 if (!strcmp((char *)devid->id, idstr)) {
                         if (matchid)
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 7417a16c8d86..c241c7594bbc 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -131,6 +131,7 @@ static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
 struct acpi_scan_handler {
         const struct acpi_device_id *ids;
         struct list_head list_node;
+        bool (*match)(char *idstr, const struct acpi_device_id **matchid);
         int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
         void (*detach)(struct acpi_device *dev);
         void (*bind)(struct device *phys_dev);