linux-kernel - Re: [BUGFIX 8/9] ACPI: introduce several helper functions

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Date:	Thu, 13 Jun 2013 20:36:33 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiang Liu <jiang.liu@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"Alexander E . Patrakov" <patrakov@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Jiang Liu <liuj97@...il.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUGFIX 8/9] ACPI: introduce several helper functions

On Friday, June 14, 2013 12:32:31 AM Jiang Liu wrote:
> Introduce several helper functions, which will be used to simplify code.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>

Again, this is not 3.10 material.

And you could easily say "three" instead of "several" in the changelog. :-)

Thanks,
Rafael


> ---
>  drivers/acpi/utils.c    | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
>  include/acpi/acpi_bus.h |  5 ++++
>  2 files changed, 79 insertions(+)
> 
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index 74437130..cb66fce 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -495,3 +495,77 @@ acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
>  	kfree(buffer.pointer);
>  }
>  EXPORT_SYMBOL(acpi_handle_printk);
> +
> +/**
> + * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations
> + * @handle: ACPI device handle
> + *
> + * Evaluate device's _EJ0 method for hotplug operations.
> + */
> +acpi_status acpi_evaluate_ej0(acpi_handle handle)
> +{
> +	acpi_status status;
> +	union acpi_object arg;
> +	struct acpi_object_list arg_list;
> +
> +	arg.type = ACPI_TYPE_INTEGER;
> +	arg.integer.value = 1;
> +	arg_list.count = 1;
> +	arg_list.pointer = &arg;
> +	status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
> +	if (status == AE_NOT_FOUND) {
> +		acpi_handle_warn(handle, "No _EJ0 support for device\n");
> +	} else if (ACPI_FAILURE(status)) {
> +		acpi_handle_warn(handle, "Eject failed (0x%x)\n", status);
> +	}
> +
> +	return status;
> +}
> +
> +/**
> + * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device
> + * @handle: ACPI device handle
> + * @lock: lock device if non-zero, otherwise unlock device
> + *
> + * Evaluate device's _LCK method if present to lock/unlock device
> + */
> +acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
> +{
> +	acpi_status status;
> +	union acpi_object arg;
> +	struct acpi_object_list arg_list;
> +
> +	arg_list.count = 1;
> +	arg_list.pointer = &arg;
> +	arg.type = ACPI_TYPE_INTEGER;
> +	arg.integer.value = !!lock;
> +	status = acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
> +	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> +		if (lock)
> +			acpi_handle_warn(handle,
> +				"Locking device failed (0x%x)\n", status);
> +		else
> +			acpi_handle_warn(handle,
> +				"Unlocking device failed (0x%x)\n", status);
> +	}
> +
> +	return status;
> +}
> +
> +/**
> + * acpi_has_method: Check whether @handle has a method named @name
> + * @handle: ACPI device handle
> + * @name: name of object or method
> + *
> + * Check whether @handle has a method named @name.
> + */
> +int acpi_has_method(acpi_handle handle, char *name)
> +{
> +	acpi_status status;
> +	acpi_handle tmp;
> +
> +	status = acpi_get_handle(handle, name, &tmp);
> +
> +	return ACPI_FAILURE(status) ? 0 : 1;
> +}
> +EXPORT_SYMBOL(acpi_has_method);
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 636c59f..5df5f89 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -56,6 +56,11 @@ acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
>  
>  acpi_status
>  acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
> +
> +acpi_status acpi_evaluate_ej0(acpi_handle handle);
> +acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
> +int acpi_has_method(acpi_handle handle, char *name);
> +
>  #ifdef CONFIG_ACPI
>  
>  #include <linux/proc_fs.h>
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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