Re: [PATCH v1 2/4] platform/x86: asus-laptop: Convert ACPI driver to a platform one

[Denis Benato]

On 2/28/26 16:11, Rafael J. Wysocki wrote:
> From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
>
> In all cases in which a struct acpi_driver is used for binding a driver
> to an ACPI device object, a corresponding platform device is created by
> the ACPI core and that device is regarded as a proper representation of
> underlying hardware.  Accordingly, a struct platform_driver should be
> used by driver code to bind to that device.  There are multiple reasons
> why drivers should not bind directly to ACPI device objects [1].
>
> Overall, it is better to bind drivers to platform devices than to their
> ACPI companions, so convert the Asus laptop ACPI driver to a platform
> one.
>
> While this is not expected to alter functionality, it changes sysfs
> layout and so it will be visible to user space.
Alright I will take a look if asus-linux software is affected and act accordingly.
How much time do I have?

Thanks. 
> Link: https://lore.kernel.org/all/2396510.ElGaqSPkdT@rafael.j.wysocki/ [1]
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reviewed-by: Denis Benato <denis.benato@xxxxxxxxx>
> ---
>  drivers/platform/x86/asus-laptop.c | 35 +++++++++++++++---------------
>  1 file changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
> index c927665dfa96..dbbb6292cd11 100644
> --- a/drivers/platform/x86/asus-laptop.c
> +++ b/drivers/platform/x86/asus-laptop.c
> @@ -1824,8 +1824,9 @@ static void asus_dmi_check(void)
>  
>  static bool asus_device_present;
>  
> -static int asus_acpi_add(struct acpi_device *device)
> +static int asus_acpi_probe(struct platform_device *pdev)
>  {
> +	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
>  	struct asus_laptop *asus;
>  	int result;
>  
> @@ -1837,7 +1838,6 @@ static int asus_acpi_add(struct acpi_device *device)
>  	asus->handle = device->handle;
>  	strscpy(acpi_device_name(device), ASUS_LAPTOP_DEVICE_NAME);
>  	strscpy(acpi_device_class(device), ASUS_LAPTOP_CLASS);
> -	device->driver_data = asus;
>  	asus->device = device;
>  
>  	asus_dmi_check();
> @@ -1846,6 +1846,8 @@ static int asus_acpi_add(struct acpi_device *device)
>  	if (result)
>  		goto fail_platform;
>  
> +	platform_set_drvdata(pdev, asus);
> +
>  	/*
>  	 * Need platform type detection first, then the platform
>  	 * device.  It is used as a parent for the sub-devices below.
> @@ -1907,11 +1909,12 @@ static int asus_acpi_add(struct acpi_device *device)
>  	return result;
>  }
>  
> -static void asus_acpi_remove(struct acpi_device *device)
> +static void asus_acpi_remove(struct platform_device *pdev)
>  {
> -	struct asus_laptop *asus = acpi_driver_data(device);
> +	struct asus_laptop *asus = platform_get_drvdata(pdev);
>  
> -	acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, asus_acpi_notify);
> +	acpi_dev_remove_notify_handler(asus->device, ACPI_DEVICE_NOTIFY,
> +				       asus_acpi_notify);
>  	asus_backlight_exit(asus);
>  	asus_rfkill_exit(asus);
>  	asus_led_exit(asus);
> @@ -1930,15 +1933,13 @@ static const struct acpi_device_id asus_device_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(acpi, asus_device_ids);
>  
> -static struct acpi_driver asus_acpi_driver = {
> -	.name = ASUS_LAPTOP_NAME,
> -	.class = ASUS_LAPTOP_CLASS,
> -	.ids = asus_device_ids,
> -	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
> -	.ops = {
> -		.add = asus_acpi_add,
> -		.remove = asus_acpi_remove,
> -		},
> +static struct platform_driver asus_acpi_driver = {
> +	.probe = asus_acpi_probe,
> +	.remove = asus_acpi_remove,
> +	.driver = {
> +		.name = ASUS_LAPTOP_NAME,
> +		.acpi_match_table = asus_device_ids,
> +	},
>  };
>  
>  static int __init asus_laptop_init(void)
> @@ -1949,7 +1950,7 @@ static int __init asus_laptop_init(void)
>  	if (result < 0)
>  		return result;
>  
> -	result = acpi_bus_register_driver(&asus_acpi_driver);
> +	result = platform_driver_register(&asus_acpi_driver);
>  	if (result < 0)
>  		goto fail_acpi_driver;
>  	if (!asus_device_present) {
> @@ -1959,7 +1960,7 @@ static int __init asus_laptop_init(void)
>  	return 0;
>  
>  fail_no_device:
> -	acpi_bus_unregister_driver(&asus_acpi_driver);
> +	platform_driver_unregister(&asus_acpi_driver);
>  fail_acpi_driver:
>  	platform_driver_unregister(&platform_driver);
>  	return result;
> @@ -1967,7 +1968,7 @@ static int __init asus_laptop_init(void)
>  
>  static void __exit asus_laptop_exit(void)
>  {
> -	acpi_bus_unregister_driver(&asus_acpi_driver);
> +	platform_driver_unregister(&asus_acpi_driver);
>  	platform_driver_unregister(&platform_driver);
>  }
>