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Message-ID: <20250830053404.763995-12-srosek@google.com>
Date: Sat, 30 Aug 2025 05:34:03 +0000
From: Slawomir Rosek <srosek@...gle.com>
To: "Rafael J . Wysocki" <rafael@...nel.org>, Alex Hung <alexhung@...il.com>,
Hans de Goede <hansg@...nel.org>, Ilpo Jarvinen <ilpo.jarvinen@...ux.intel.com>,
AceLan Kao <acelan.kao@...onical.com>, Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Zhang Rui <rui.zhang@...el.com>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, Tomasz Nowicki <tnowicki@...gle.com>,
Stanislaw Kardach <skardach@...gle.com>, Michal Krawczyk <mikrawczyk@...gle.com>,
linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
platform-driver-x86@...r.kernel.org, linux-pm@...r.kernel.org,
Slawomir Rosek <srosek@...gle.com>
Subject: [PATCH v1 11/12] ACPI: platform: Add macro for acpi platform driver
Introduce module_acpi_platform_driver() macro to simplify dynamic
enumeration of ACPI device objects on the platform bus by loadable
modules. Move common code from the intel-hid and intel-vbtn drivers
to the ACPI platform core.
Signed-off-by: Slawomir Rosek <srosek@...gle.com>
---
drivers/acpi/acpi_platform.c | 27 ++++++++++++++++++++
drivers/platform/x86/intel/hid.c | 41 +------------------------------
drivers/platform/x86/intel/vbtn.c | 30 +---------------------
include/linux/platform_device.h | 17 +++++++++++++
4 files changed, 46 insertions(+), 69 deletions(-)
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index 48d15dd785f6..adf32ffa6be6 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -190,6 +190,33 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
}
EXPORT_SYMBOL_GPL(acpi_create_platform_device);
+static acpi_status
+__acpi_platform_driver_register_cb(acpi_handle handle, u32 lvl,
+ void *context, void **rv)
+{
+ const struct acpi_device_id *ids = context;
+ struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
+
+ if (dev && acpi_match_device_ids(dev, ids) == 0)
+ if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL))) {
+ dev_info(&dev->dev,
+ "created platform device\n");
+ }
+
+ return AE_OK;
+}
+
+int __acpi_platform_driver_register(struct platform_driver *drv,
+ struct module *owner)
+{
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
+ __acpi_platform_driver_register_cb, NULL,
+ (void *)drv->driver.acpi_match_table, NULL);
+
+ return __platform_driver_register(drv, owner);
+}
+EXPORT_SYMBOL_GPL(__acpi_platform_driver_register);
+
void __init acpi_platform_init(void)
{
acpi_reconfig_notifier_register(&acpi_platform_notifier);
diff --git a/drivers/platform/x86/intel/hid.c b/drivers/platform/x86/intel/hid.c
index f25a427cccda..e2e0fc95e177 100644
--- a/drivers/platform/x86/intel/hid.c
+++ b/drivers/platform/x86/intel/hid.c
@@ -766,43 +766,4 @@ static struct platform_driver intel_hid_pl_driver = {
.remove = intel_hid_remove,
};
-/*
- * Unfortunately, some laptops provide a _HID="INT33D5" device with
- * _CID="PNP0C02". This causes the pnpacpi scan driver to claim the
- * ACPI node, so no platform device will be created. The pnpacpi
- * driver rejects this device in subsequent processing, so no physical
- * node is created at all.
- *
- * As a workaround until the ACPI core figures out how to handle
- * this corner case, manually ask the ACPI platform device code to
- * claim the ACPI node.
- */
-static acpi_status __init
-check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
- const struct acpi_device_id *ids = context;
- struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
-
- if (dev && acpi_match_device_ids(dev, ids) == 0)
- if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
- dev_info(&dev->dev,
- "intel-hid: created platform device\n");
-
- return AE_OK;
-}
-
-static int __init intel_hid_init(void)
-{
- acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
- ACPI_UINT32_MAX, check_acpi_dev, NULL,
- (void *)intel_hid_ids, NULL);
-
- return platform_driver_register(&intel_hid_pl_driver);
-}
-module_init(intel_hid_init);
-
-static void __exit intel_hid_exit(void)
-{
- platform_driver_unregister(&intel_hid_pl_driver);
-}
-module_exit(intel_hid_exit);
+module_acpi_platform_driver(intel_hid_pl_driver);
diff --git a/drivers/platform/x86/intel/vbtn.c b/drivers/platform/x86/intel/vbtn.c
index 232cd12e3c9f..42932479de35 100644
--- a/drivers/platform/x86/intel/vbtn.c
+++ b/drivers/platform/x86/intel/vbtn.c
@@ -390,32 +390,4 @@ static struct platform_driver intel_vbtn_pl_driver = {
.remove = intel_vbtn_remove,
};
-static acpi_status __init
-check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
- const struct acpi_device_id *ids = context;
- struct acpi_device *dev = acpi_fetch_acpi_dev(handle);
-
- if (dev && acpi_match_device_ids(dev, ids) == 0)
- if (!IS_ERR_OR_NULL(acpi_create_platform_device(dev, NULL)))
- dev_info(&dev->dev,
- "intel-vbtn: created platform device\n");
-
- return AE_OK;
-}
-
-static int __init intel_vbtn_init(void)
-{
- acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
- ACPI_UINT32_MAX, check_acpi_dev, NULL,
- (void *)intel_vbtn_ids, NULL);
-
- return platform_driver_register(&intel_vbtn_pl_driver);
-}
-module_init(intel_vbtn_init);
-
-static void __exit intel_vbtn_exit(void)
-{
- platform_driver_unregister(&intel_vbtn_pl_driver);
-}
-module_exit(intel_vbtn_exit);
+module_acpi_platform_driver(intel_vbtn_pl_driver);
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 074754c23d33..3b70b054d8a5 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -264,6 +264,14 @@ extern int __platform_driver_register(struct platform_driver *,
struct module *);
extern void platform_driver_unregister(struct platform_driver *);
+/*
+ * use a macro to avoid include chaining to get THIS_MODULE
+ */
+#define acpi_platform_driver_register(drv) \
+ __acpi_platform_driver_register(drv, THIS_MODULE)
+extern int __acpi_platform_driver_register(struct platform_driver *,
+ struct module *);
+
/* non-hotpluggable platform devices may use this so that probe() and
* its support may live in __init sections, conserving runtime memory.
*/
@@ -292,6 +300,15 @@ static inline void platform_set_drvdata(struct platform_device *pdev,
module_driver(__platform_driver, platform_driver_register, \
platform_driver_unregister)
+/* module_acpi_platform_driver() - Helper macro for drivers that don't do
+ * anything special in module init/exit. This eliminates a lot of
+ * boilerplate. Each module may only use this macro once, and
+ * calling it replaces module_init() and module_exit()
+ */
+#define module_acpi_platform_driver(__platform_driver) \
+ module_driver(__platform_driver, acpi_platform_driver_register, \
+ platform_driver_unregister)
+
/* builtin_platform_driver() - Helper macro for builtin drivers that
* don't do anything special in driver init. This eliminates some
* boilerplate. Each driver may only use this macro once, and
--
2.51.0.318.gd7df087d1a-goog
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