[PATCH v5 1/2] ACPI: provide acpi_bus_find_device_by_name()

[Bartosz Golaszewski]

Provide a helper allowing to locate an ACPI device by its name.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxxxxxxxx>
---
 drivers/acpi/bus.c   | 15 +++++++++++++++
 include/linux/acpi.h |  7 +++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 2ec095e2009e40b0645f654fb051429e5679dc7c..357b39db345d596314e8956d7789ef0cc51ad1c1 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -1181,6 +1181,21 @@ int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data)
 }
 EXPORT_SYMBOL_GPL(acpi_bus_for_each_dev);
 
+/**
+ * acpi_bus_find_device_by_name() - Locate an ACPI device by its name
+ * @name: Name of the device to match
+ *
+ * The caller is responsible for calling put_device() on the returned object.
+ *
+ * Returns:
+ * New reference to the matched device or NULL if the device can't be found.
+ */
+struct device *acpi_bus_find_device_by_name(const char *name)
+{
+	return bus_find_device_by_name(&acpi_bus_type, NULL, name);
+}
+EXPORT_SYMBOL_GPL(acpi_bus_find_device_by_name);
+
 struct acpi_dev_walk_context {
 	int (*fn)(struct acpi_device *, void *);
 	void *data;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 67effb91fa98373d7bf19be5ae3d8baa9328d6e1..10d6c6c11bdffcad14100601e104520366dfc30b 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -798,6 +798,8 @@ int acpi_get_local_u64_address(acpi_handle handle, u64 *addr);
 int acpi_get_local_address(acpi_handle handle, u32 *addr);
 const char *acpi_get_subsystem_id(acpi_handle handle);
 
+struct device *acpi_bus_find_device_by_name(const char *name);
+
 #ifdef CONFIG_ACPI_MRRM
 int acpi_mrrm_max_mem_region(void);
 #endif
@@ -1106,6 +1108,11 @@ static inline const char *acpi_get_subsystem_id(acpi_handle handle)
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct device *acpi_bus_find_device_by_name(const char *name)
+{
+	return NULL;
+}
+
 static inline int acpi_register_wakeup_handler(int wake_irq,
 	bool (*wakeup)(void *context), void *context)
 {

-- 
2.47.3