[RFC PATCH 1/6] Introduce acpi_match_device_id().

[Zhang Rui]

This API is used to check if a device id string is compatible
with an ACPI device,
either PNP id exported via _HID or compatible ids exported
via _CID control method.

Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
 drivers/acpi/scan.c     |   22 ++++++++++++++++++++++
 include/acpi/acpi_bus.h |    6 ++++++
 2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index d1ecca2..936a7c9 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -312,6 +312,28 @@ int acpi_match_device_ids(struct acpi_device *device,
 }
 EXPORT_SYMBOL(acpi_match_device_ids);
 
+int acpi_match_device_id(const struct device *dev, const char *id)
+{
+	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
+	struct acpi_device *device;
+	struct acpi_hardware_id *hwid;
+	acpi_status status;
+
+	if (!handle || !id)
+		return -ENODEV;
+
+	status = acpi_bus_get_device(handle, &device);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	list_for_each_entry(hwid, &device->pnp.ids, list)
+		if (!strcmp(id, hwid->id))
+			return 0;
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL(acpi_match_device_id);
+
 static void acpi_free_ids(struct acpi_device *device)
 {
 	struct acpi_hardware_id *id, *tmp;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index bde976e..8b5b124 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -378,6 +378,7 @@ int acpi_bus_start(struct acpi_device *device);
 acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
 int acpi_match_device_ids(struct acpi_device *device,
 			  const struct acpi_device_id *ids);
+int acpi_match_device_id(const struct device *, const char *);
 int acpi_create_dir(struct acpi_device *);
 void acpi_remove_dir(struct acpi_device *);
 
@@ -448,6 +449,11 @@ static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 
 static inline int register_acpi_bus_type(void *bus) { return 0; }
 static inline int unregister_acpi_bus_type(void *bus) { return 0; }
+static inline int acpi_match_device_id(const struct device *device,
+					const char *name)
+{
+	return -ENODEV;
+}
 
 #endif				/* CONFIG_ACPI */
 
-- 
1.7.7.6



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