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From:   Raag Jadav <raag.jadav@intel.com>
To:     rafael@kernel.org, len.brown@intel.com, robert.moore@intel.com,
        mika.westerberg@linux.intel.com, andriy.shevchenko@linux.intel.com,
        mark.rutland@arm.com, will@kernel.org, linux@roeck-us.net,
        Jonathan.Cameron@Huawei.com
Cc:     linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
        acpica-devel@lists.linuxfoundation.org, linux-gpio@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-hwmon@vger.kernel.org,
        mallikarjunappa.sangannavar@intel.com, bala.senthil@intel.com,
        Raag Jadav <raag.jadav@intel.com>
Subject: [PATCH v3 1/6] ACPI: utils: Introduce acpi_dev_uid_match() for matching _UID
Date:   Tue, 24 Oct 2023 11:50:13 +0530
Message-Id: <20231024062018.23839-2-raag.jadav@intel.com>
In-Reply-To: <20231024062018.23839-1-raag.jadav@intel.com>
References: <20231024062018.23839-1-raag.jadav@intel.com>
Precedence: bulk

Introduce acpi_dev_uid_match() helper that matches the device with
supplied _UID string.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
---
 drivers/acpi/utils.c    | 31 +++++++++++++++++++++++++++----
 include/acpi/acpi_bus.h |  1 +
 include/linux/acpi.h    |  5 +++++
 3 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 79915d4a0031..be21b77059af 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -824,20 +824,43 @@ bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs)
 }
 EXPORT_SYMBOL(acpi_check_dsm);
 
+/**
+ * acpi_dev_uid_match - Match device by supplied UID
+ * @adev: ACPI device to match.
+ * @uid2: Unique ID of the device.
+ *
+ * Matches UID in @adev with given @uid2.
+ *
+ * Returns:
+ *  - %true if matches.
+ *  - %false otherwise.
+ */
+bool acpi_dev_uid_match(struct acpi_device *adev, const char *uid2)
+{
+	const char *uid1 = acpi_device_uid(adev);
+
+	return uid1 && uid2 && !strcmp(uid1, uid2);
+}
+EXPORT_SYMBOL_GPL(acpi_dev_uid_match);
+
 /**
  * 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.
+ * Matches HID and UID in @adev with given @hid2 and @uid2. Absence of @uid2
+ * will be treated as a match. If user wants to validate @uid2, it should be
+ * done before calling this function.
+ *
+ * Returns:
+ *  - %true if matches or @uid2 is NULL.
+ *  - %false otherwise.
  */
 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;
@@ -845,7 +868,7 @@ bool acpi_dev_hid_uid_match(struct acpi_device *adev,
 	if (!uid2)
 		return true;
 
-	return uid1 && !strcmp(uid1, uid2);
+	return acpi_dev_uid_match(adev, uid2);
 }
 EXPORT_SYMBOL(acpi_dev_hid_uid_match);
 
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 756b3f3c2c45..afeed6e72049 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -763,6 +763,7 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
 		adev->power.states[ACPI_STATE_D3_HOT].flags.explicit_set);
 }
 
+bool acpi_dev_uid_match(struct acpi_device *adev, const char *uid2);
 bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2);
 int acpi_dev_uid_to_integer(struct acpi_device *adev, u64 *integer);
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index afd94c9b8b8a..db3a33e19c97 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -787,6 +787,11 @@ static inline bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
 
 struct acpi_device;
 
+static inline bool acpi_dev_uid_match(struct acpi_device *adev, const char *uid2)
+{
+	return false;
+}
+
 static inline bool
 acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2)
 {
-- 
2.17.1