[v1,2/5] ACPI / utils: Introduce acpi_dev_hid_uid_match() helper

Commit Message

Andy Shevchenko Sept. 24, 2019, 12:01 p.m. UTC

There are users outside of ACPI realm which reimplementing the comparator
function to check if the given device matches to given HID and UID.

For better utilization, introduce a helper for everyone to use.

Signed-off-by: Andy Shevchenko <[e-mail]>
---
 drivers/acpi/utils.c    | 25 +++++++++++++++++++++++++
 include/acpi/acpi_bus.h |  3 +++
 include/linux/acpi.h    |  6 ++++++
 3 files changed, 34 insertions(+)

Patch

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index dbd1c4cfd7d1..804ac0df58ec 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -701,6 +701,31 @@  bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs)
 }
 EXPORT_SYMBOL(acpi_check_dsm);
 
+/**
+ * acpi_dev_hid_uid_match - Match device by supplied HID and UID
+ * @adev: ACPI device to match.
+ * @hid2: Hardware ID of the device.
+ * @uid2: Unique ID of the device, pass NULL to not check _UID.
+ *
+ * Matches HID and UID in @adev with given @hid2 and @uid2.
+ * Returns true if matches.
+ */
+bool acpi_dev_hid_uid_match(struct acpi_device *adev,
+			    const char *hid2, const char *uid2)
+{
+	const char *hid1 = acpi_device_hid(adev);
+	const char *uid1 = acpi_device_uid(adev);
+
+	if (strcmp(hid1, hid2))
+		return false;
+
+	if (!uid2)
+		return true;
+
+	return uid1 && !strcmp(uid1, uid2);
+}
+EXPORT_SYMBOL(acpi_dev_hid_uid_match);
+
 /**
  * acpi_dev_found - Detect presence of a given ACPI device in the namespace.
  * @hid: Hardware ID of the device.
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 175f7b40c585..d3cc8a786065 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -75,6 +75,9 @@  acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *guid, u64 rev,
 	  .package.elements = (eles)			\
 	}
 
+bool acpi_dev_hid_uid_match(struct acpi_device *adev,
+			    const char *hid2, const char *uid2);
+
 bool acpi_dev_found(const char *hid);
 bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 9426b9aaed86..272b51a4f385 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -662,6 +662,12 @@  static inline u64 acpi_arch_get_root_pointer(void)
 
 struct fwnode_handle;
 
+static inline bool acpi_dev_hid_uid_match(struct acpi_device *adev,
+					  const char *hid2, const char *uid2)
+{
+	return false;
+}
+
 static inline bool acpi_dev_found(const char *hid)
 {
 	return false;