linux-kernel - [PATCH v3 1/8] ACPI: utils: Add acpi_dev_uid_to_integer() helper to get

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Message-Id: <20220913163147.24258-2-andriy.shevchenko@linux.intel.com>
Date:   Tue, 13 Sep 2022 19:31:40 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Mark Brown <broonie@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        devel@...ica.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Elie Morisse <syniurge@...il.com>,
        Nehal Shah <nehal-bakulchandra.shah@....com>,
        Shyam Sundar S K <shyam-sundar.s-k@....com>,
        Khalil Blaiech <kblaiech@...dia.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Robert Moore <robert.moore@...el.com>
Subject: [PATCH v3 1/8] ACPI: utils: Add acpi_dev_uid_to_integer() helper to get _UID as integer

Some users interpret _UID only as integer and for them it's easier to
have an integer representation of _UID. Add respective helper for that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/acpi/utils.c    | 24 ++++++++++++++++++++++++
 include/acpi/acpi_bus.h |  1 +
 include/linux/acpi.h    |  5 +++++
 3 files changed, 30 insertions(+)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 4acd6f7d1395..2ea14648a661 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -793,6 +793,30 @@ bool acpi_dev_hid_uid_match(struct acpi_device *adev,
 }
 EXPORT_SYMBOL(acpi_dev_hid_uid_match);
 
+/**
+ * acpi_dev_uid_to_integer - treat ACPI device _UID as integer
+ * @adev: ACPI device to get _UID from
+ * @integer: output buffer for integer
+ *
+ * Considers _UID as integer and converts it to @integer.
+ *
+ * Returns 0 on success, or negative error code otherwise.
+ */
+int acpi_dev_uid_to_integer(struct acpi_device *adev, u64 *integer)
+{
+	const char *uid;
+
+	if (!adev)
+		return -ENODEV;
+
+	uid = acpi_device_uid(adev);
+	if (!uid)
+		return -ENODATA;
+
+	return kstrtou64(uid, 0, integer);
+}
+EXPORT_SYMBOL(acpi_dev_uid_to_integer);
+
 /**
  * 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 42f76f2c2d49..1804d7a70918 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -739,6 +739,7 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev)
 }
 
 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);
 
 void acpi_dev_clear_dependencies(struct acpi_device *supplier);
 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index ed4aa395cc49..619b2b1e4fb4 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -799,6 +799,11 @@ acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *u
 	return false;
 }
 
+static inline int acpi_dev_uid_to_integer(struct acpi_device *adev, u64 *integer)
+{
+	return -ENODEV;
+}
+
 static inline struct acpi_device *
 acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
 {
-- 
2.35.1