linux-kernel - Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power status

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Message-ID: <20170914145919.GU2477@lahna.fi.intel.com>
Date:   Thu, 14 Sep 2017 17:59:19 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Mario.Limonciello@...l.com
Cc:     lukas@...ner.de, dvhart@...radead.org,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        hughsient@...il.com, yehezkelshb@...il.com
Subject: Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power
 status

On Thu, Sep 14, 2017 at 02:52:27PM +0000, Mario.Limonciello@...l.com wrote:
> > Looking at drivers/platform/x86/wmi.c:wmi_dev_uevent() it seems that
> > a modalias consisting of "wmi:" followed by the GUID is sent to udevd.
> > For udevd to then load the module, I suspect you need to add a
> > MODULE_DEVICE_TABLE(wmi, ...) to your driver.
> 
> Ah, you're looking for this code from the WMI bus driver:
> https://github.com/torvalds/linux/blob/master/drivers/platform/x86/wmi.c#L724
> 
> That happens when the bus is initialized.

That's right you get the uevent and whatnot but Lucas means that if you
don't have MODULE_DEVICE_TABLE(wmi, ...) in the driver, udev cannot load
the module automatically when the device appears.