[PATCH v1 1/5] ACPI: utils: Introduce acpi_match_video_device_handle() helper

[Andy Shevchenko]

There are a couple of users that open code functionality of matching
a given handle against ACPI video device IDs. The current approach
duplicates ID table along with the matching code. Consolidate it
under the acpi_match_video_device_handle() helper's hood.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 drivers/acpi/utils.c | 19 +++++++++++++++++++
 include/linux/acpi.h |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 3a9773a09e19..4800aba3b99c 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -929,6 +929,25 @@ static int __init acpi_backlight(char *str)
 }
 __setup("acpi_backlight=", acpi_backlight);
 
+static const struct acpi_device_id video_device_ids[] = {
+	{ACPI_VIDEO_HID, 0},
+	{}
+};
+
+/**
+ * acpi_match_video_device_handle - match handle against ACPI video device IDs
+ * @handle: ACPI handle to match
+ *
+ * Return: true when matches, otherwise false.
+ */
+bool acpi_match_video_device_handle(acpi_handle handle)
+{
+	struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
+
+	return adev && !acpi_match_device_ids(adev, video_device_ids);
+}
+EXPORT_SYMBOL(acpi_match_video_device_handle);
+
 /**
  * acpi_match_platform_list - Check if the system matches with a given list
  * @plat: pointer to acpi_platform_list table terminated by a NULL entry
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 7b96a8bff6d2..c48e8a0df0cc 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -439,6 +439,8 @@ extern char *wmi_get_acpi_device_uid(const char *guid);
 
 extern char acpi_video_backlight_string[];
 extern long acpi_is_video_device(acpi_handle handle);
+extern bool acpi_match_video_device_handle(acpi_handle handle);
+
 extern int acpi_blacklisted(void);
 extern void acpi_osi_setup(char *str);
 extern bool acpi_osi_is_win8(void);
-- 
2.35.1