linux-kernel - Re: [PATCH 1/7] platform/x86: fujitsu-laptop: Define constants for FUNC operations

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Date:   Wed, 28 Feb 2018 18:08:52 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Michał Kępień <kernel@...pniu.pl>
Cc:     Jonathan Woithe <jwoithe@...t42.net>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] platform/x86: fujitsu-laptop: Define constants for
 FUNC operations

On Tue, Feb 27, 2018 at 11:15 PM, Michał Kępień <kernel@...pniu.pl> wrote:
> Various functions exposed by the firmware through the FUNC interface
> tend to use a consistent set of integers for denoting the type of
> operation to be performed for a specified feature.  Use named constants
> instead of integers in each call_fext_func() invocation in order to more
> clearly convey the intent of each call.
>
> Note that FUNC_FLAGS is a bit peculiar:

> +/* FUNC interface - operations */
> +#define OP_GET                         BIT(1)
> +#define OP_GET_CAPS                    0
> +#define OP_GET_EVENTS                  BIT(0)
> +#define OP_GET_EXT                     BIT(2)
> +#define OP_SET                         BIT(0)
> +#define OP_SET_EXT                     (BIT(2) | BIT(0))

Hmm... this looks unordered a bit.
And plain 0 doesn't look right in this concept (something like (0 <<
0) would probably do it).

-- 
With Best Regards,
Andy Shevchenko