Since what is returned by this interface is essentially a piece of information about the particular GPE, I think that it might be better to generalize this interface to a "GetInfo" type of interface that returns a few pieces of information about the GPE.
> -----Original Message-----
> From: Lan, Tianyu
> Sent: Monday, July 07, 2014 11:58 PM
> To: Moore, Robert; Zheng, Lv; Wysocki, Rafael J; lenb@xxxxxxxxxx
> Cc: Lan, Tianyu; linux-acpi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: [RFC PATCH 1/2] ACPICA: Add acpi_check_gpe_method() to check GPE
> method
>
> This patch is to expose acpi_check_gpe_method() to check whether there is
> a GPE method for the given gpe. Enabling ACPI button devices' gpes will
> depend on the new function's result.
>
> Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
> ---
> drivers/acpi/acpica/evxface.c | 39
> ++++++++++++++++++++++++++++++++++++++-
> include/acpi/acpixf.h | 3 +++
> 2 files changed, 41 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
> index 11e5803..0fcb248 100644
> --- a/drivers/acpi/acpica/evxface.c
> +++ b/drivers/acpi/acpica/evxface.c
> @@ -717,6 +717,44 @@ ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
>
>
> /*************************************************************************
> ******
> *
> + * FUNCTION: acpi_check_gpe_method
> + *
> + * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for
> FADT
> + * defined GPEs)
> + * gpe_number - The event to remove a handler
> + *
> + * RETURN: Status
> + *
> + * DESCRIPTION: Check whether the given GPE has associated event method.
> + *
> +
> +***********************************************************************
> +*******/
> +acpi_status
> +acpi_check_gpe_method(acpi_handle gpe_device, u32 gpe_number) {
> + struct acpi_gpe_event_info *gpe_event_info;
> + acpi_status status = AE_NOT_EXIST;
> + acpi_cpu_flags flags;
> +
> + ACPI_FUNCTION_TRACE(acpi_check_gpe_method);
> +
> + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
> + gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
> + if (!gpe_event_info) {
> + status = AE_ERROR;
> + goto unlock_and_exit;
> + }
> +
> + if (gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)
> + status = AE_OK;
> +
> +unlock_and_exit:
> + acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
> + return status;
> +}
> +ACPI_EXPORT_SYMBOL(acpi_check_gpe_method)
> +
> +/**********************************************************************
> +*********
> + *
> * FUNCTION: acpi_install_gpe_handler
> *
> * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for
> FADT
> @@ -821,7 +859,6 @@ free_and_exit:
> ACPI_FREE(handler);
> goto unlock_and_exit;
> }
> -
> ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
>
>
> /*************************************************************************
> ******
> diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h index
> 35b525c..5b475c6 100644
> --- a/include/acpi/acpixf.h
> +++ b/include/acpi/acpixf.h
> @@ -554,6 +554,9 @@ ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
> address,
> void *context))
> ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
> + acpi_check_gpe_method(acpi_handle gpe_device,
> + u32 gpe_number))
> +ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status
> acpi_remove_gpe_handler(acpi_handle gpe_device,
> u32 gpe_number,
> acpi_gpe_handler
> --
> 1.8.4.rc0.1.g8f6a3e5.dirty
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