linux-kernel - Re: [PATCH] Add Intel Poulsbo Stub Driver

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Message-ID: <4C8A4871.9040103@oracle.com>
Date:	Fri, 10 Sep 2010 08:02:09 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Joey Lee <jlee@...ell.com>
CC:	mjg@...hat.com, mjg59@...f.ucam.org, gregkh@...e.de, trenn@...e.de,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dennis.Jansen@....de
Subject: Re: [PATCH] Add Intel Poulsbo Stub Driver

On 09/09/10 21:36, Joey Lee wrote:
>>> +        # Poulsbo stub depends on ACPI_VIDEO when ACPI is enabled
>>> +        # but for select to work, need to select ACPI_VIDEO's dependencies, ick
>>> +        select ACPI_VIDEO if ACPI
>>
>> What does it do when ACPI is not enabled?  Does the driver even build
>> when APCI is not enabled?  (given the acpi_video* calls in it)
>>
> 
> This driver will not do anything if API is not enabled. It only call
> acpi_video_register/acpi_video_unregister, and acpi/video.h handle it
> like the following:
> 
> #if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
> extern int acpi_video_register(void);
> extern void acpi_video_unregister(void);
> extern int acpi_video_get_edid(struct acpi_device *device, int type,
>                                int device_id, void **edid);
> #else
> static inline int acpi_video_register(void) { return 0; }
> static inline void acpi_video_unregister(void) { return; }
> static inline int acpi_video_get_edid(struct acpi_device *device, int
> type,
>                                       int device_id, void **edid)
> {
>         return -ENODEV;
> }
> #endif
> 
> So, I think don't need add "depends on ACPI_VIDEO". How do you think?

Yes, OK, I see.  Thanks.

-- 
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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