linux-kernel - [PATCH V4 09/11] ACPI: introduce acpi platform exclude id list

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Message-Id: <1395042580-3344-10-git-send-email-rui.zhang@intel.com>
Date:	Mon, 17 Mar 2014 15:49:38 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	bhelgaas@...gle.com, matthew.garrett@...ula.com,
	rafael.j.wysocki@...el.com, dmitry.torokhov@...il.com,
	Zhang Rui <rui.zhang@...el.com>
Subject: [PATCH V4 09/11] ACPI: introduce acpi platform exclude id list

For ACPI PIC (PNP0000) and Timer (PNP0100) device objects, although
they have _HID control method, but they should not be enumerated to
platform bus, because there will never be any platform drivers for them.

Thus an exclude id list is introduced in this patch to prevent
those platform device nodes from being created.

Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
 drivers/acpi/acpi_platform.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index 33376a9..91ed43a 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -22,6 +22,17 @@
 
 ACPI_MODULE_NAME("platform");
 
+static const struct acpi_device_id excluded_id_list[] = {
+	{"PNP0000", 0},	/* PIC */
+	{"PNP0100", 0},	/* Timer */
+	{"", 0},
+};
+
+static bool is_exclusive_device(struct acpi_device *dev)
+{
+	return !acpi_match_device_ids(dev, excluded_id_list);
+}
+
 /**
  * acpi_create_platform_device - Create platform device for ACPI device node
  * @adev: ACPI device node to create a platform device for.
@@ -48,6 +59,9 @@ int acpi_create_platform_device(struct acpi_device *adev,
 	if (adev->physical_node_count)
 		return 0;
 
+	if (is_exclusive_device(adev))
+		return 0;
+
 	INIT_LIST_HEAD(&resource_list);
 	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
 	if (count < 0) {
-- 
1.7.9.5

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