linux-kernel - Re: [PATCH v10 03/14] HP BIOSCFG driver

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Message-ID: <CAOOmCE_bp8yvDagQZFE+a4nSEnW1LnU0j+8JH18Enh3A=Naekg@mail.gmail.com>
Date:   Tue, 25 Apr 2023 13:47:22 -0500
From:   Jorge Lopez <jorgealtxwork@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Armin Wolf <W_Armin@....de>, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas@...ch.de
Subject: Re: [PATCH v10 03/14] HP BIOSCFG driver - bioscfg

On Tue, Apr 25, 2023 at 9:59 AM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi,
>
> On 4/25/23 16:32, Jorge Lopez wrote:
> > On Tue, Apr 25, 2023 at 5:34 AM Hans de Goede <hdegoede@...hat.com> wrote:
> >>
> >> Hi All,
> >>
> >> On 4/19/23 20:04, Armin Wolf wrote:
> >>> Am 19.04.23 um 17:13 schrieb Jorge Lopez:
> >>
> >> <snip>
> >>
> >>>> +static int __init bioscfg_init(void)
> >>>> +{
> >>>> +    int ret = 0;
> >>>> +    int bios_capable = wmi_has_guid(HP_WMI_BIOS_GUID);
> >>>> +
> >>>> +    if (!bios_capable) {
> >>>> +        pr_err("Unable to run on non-HP system\n");
> >>>> +        return -ENODEV;
> >>>> +    }
> >>>> +
> >>>
> >>> Currently, this driver will no get automatically loaded on supported hardware,
> >>> something which would be quite beneficial for users to have.
> >>> Since the HP_WMI_BIOS_GUID is already handled by the hp-wmi driver, maybe this
> >>> driver (which also already implements a function similar to hp_wmi_perform_query())
> >>> could register a platform device which is then used by this driver? This together
> >>> with MODULE_DEVICE_TABLE() would allow for automatically loading the module on supported hardware.
> >>
> >> Both drivers can already co-exist since the old hp-wmi driver uses the old
> >> wmi kernel functions and is not a "wmi_driver" so there is no need for
> >> a platform_device for this driver to bind to since the wmi_device is
> >> still free for it to bind to.
> >>
> >> This does indeed need a MODULE_DEVICE_TABLE() statement for
> >> the bios_attr_pass_interface_id_table[] id-table. Note only for that
> >> table, because the HP_WMI_BIOS_GUID is present on models which do
> >> not support this and we don't want the module to auto-load there.
> >>
> >
> > I am considering adding a check for the  HP_WMI_SET_BIOS_SETTING_GUID
> > and HP_WMI_BIOS_GUID during the initialization process.
> > The driver will report a message If HP_WMI_SET_BIOS_SETTING_GUID is
> > found or not.
> > If HP_WMI_SET_BIOS_SETTING_GUID does not exist, the driver cannot
> > change the BIOS settings.
>
> Right, adding a check for  HP_WMI_BIOS_GUID to bioscfg_init()
> sounds like a good idea.
>
> That + add a a MODULE_DEVICE_TABLE() statement to
> the bios_attr_pass_interface_id_table[] id-table.
>

Will do. Thanks

> Regards,
>
> Hans
>
>