Re: [PATCH v1 2/3] platform/surface: surfacepro3_button: Register ACPI notify handler

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

On Wed, 4 Mar 2026, Rafael J. Wysocki wrote:

> From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
> 
> To facilitate subsequent conversion of the driver to a platform one,
> make it install an ACPI notify handler directly instead of using
> a .notify() callback in struct acpi_driver.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
>  drivers/platform/surface/surfacepro3_button.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/surface/surfacepro3_button.c b/drivers/platform/surface/surfacepro3_button.c
> index a6c9d4d370be..6d394daf5bc4 100644
> --- a/drivers/platform/surface/surfacepro3_button.c
> +++ b/drivers/platform/surface/surfacepro3_button.c
> @@ -72,8 +72,9 @@ struct surface_button {
>  	bool suspended;
>  };
>  
> -static void surface_button_notify(struct acpi_device *device, u32 event)
> +static void surface_button_notify(acpi_handle handle, u32 event, void *data)
>  {
> +	struct acpi_device *device = data;
>  	struct surface_button *button = acpi_driver_data(device);
>  	struct input_dev *input;
>  	int key_code = KEY_RESERVED;
> @@ -227,6 +228,15 @@ static int surface_button_add(struct acpi_device *device)
>  		goto err_free_input;
>  
>  	device_init_wakeup(&device->dev, true);
> +
> +	error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
> +						surface_button_notify, device);
> +	if (error) {
> +		device_init_wakeup(&device->dev, false);
> +		input_unregister_device(input);

Add a new label to rollback path instead.

> +		goto err_free_button;
> +	}
> +
>  	dev_info(&device->dev, "%s [%s]\n", acpi_device_name(device),
>  		 acpi_device_bid(device));
>  	return 0;
> @@ -242,6 +252,8 @@ static void surface_button_remove(struct acpi_device *device)
>  {
>  	struct surface_button *button = acpi_driver_data(device);
>  
> +	acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
> +				       surface_button_notify);
>  	device_init_wakeup(&device->dev, false);
>  	input_unregister_device(button->input);
>  	kfree(button);
> @@ -257,7 +269,6 @@ static struct acpi_driver surface_button_driver = {
>  	.ops = {
>  		.add = surface_button_add,
>  		.remove = surface_button_remove,
> -		.notify = surface_button_notify,
>  	},
>  	.drv.pm = &surface_button_pm,
>  };
> 

-- 
 i.