linux-kernel - Re: [RFC PATCH 1/2] ACPICA: Add acpi_check_gpe

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Date:	Tue, 08 Jul 2014 15:19:40 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Lan Tianyu <tianyu.lan@...el.com>
Cc:	robert.moore@...el.com, lv.zheng@...el.com,
	rafael.j.wysocki@...el.com, lenb@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] ACPICA: Add acpi_check_gpe_method() to check GPE method

On Tuesday, July 08, 2014 02:57:57 PM Lan Tianyu wrote:
> 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@...el.com>
> ---
>  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)

This should be a boolean routine (ie. returning 0 or 1) called something like
acpi_gpe_has_method() that will return 1 if there's a method for the given GPE
and 0 otherwise.

> +{
> +	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
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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