linux-kernel - Re: [PATCH v2 12/14] platform/x86: dell-wmi-smbios: introduce character device for userspace

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Message-ID: <CAHp75Vc9gKeBP2-hcN2xX58R_RbKtciW-9aKESUs6Xwk2e2b-Q@mail.gmail.com>
Date:   Tue, 26 Sep 2017 22:04:17 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Mario Limonciello <mario.limonciello@...l.com>
Cc:     "dvhart@...radead.org" <dvhart@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        quasisec@...gle.com,
        Pali Rohár <pali.rohar@...il.com>
Subject: Re: [PATCH v2 12/14] platform/x86: dell-wmi-smbios: introduce
 character device for userspace

On Tue, Sep 26, 2017 at 9:50 PM, Mario Limonciello
<mario.limonciello@...l.com> wrote:
> This userspace character device will be used to perform SMBIOS calls
> from any applications.
>
> It contains 3 operating IOCTL's
> 1) sending a properly formatted 4k calling interface buffer.
> 2) Querying number of tokens in the given system
> 3) Copying the status of all these tokens to a properly formatted
>    userspace buffer.
>
> This character device is intended to deprecate the dcdbas kernel module
> and the interface that it provides to userspace.
>
> It's important for the driver to provide a R/W ioctl to ensure that
> two competing userspace processes don't race to provide or read each
> others data.
>
> The character device will only be created if the WMI interface was
> found.
>
> The API for interacting with this interface is defined in documentation
> as well as a uapi header provides the format of the structures.


> +               <uapi/linux/dell-wmi-smbios.h>
> \ No newline at end of file

Oh là là

-- 
With Best Regards,
Andy Shevchenko