linux-kernel - Re: [PATCH] toshiba_acpi: Avoid registering input device on WMI event laptops

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Message-ID: <20150722205459.GA102536@vmdeb7>
Date:	Wed, 22 Jul 2015 13:54:59 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	Azael Avalos <coproscefalo@...il.com>
Cc:	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] toshiba_acpi: Avoid registering input device on WMI
 event laptops

On Mon, Jul 20, 2015 at 04:49:51PM -0600, Azael Avalos wrote:
> Hi Darren,
> 
> 2015-07-20 15:55 GMT-06:00 Darren Hart <dvhart@...radead.org>:
> > On Thu, Jul 16, 2015 at 05:38:57PM -0600, Azael Avalos wrote:
> >> Commit f11f999e9890 ("toshiba_acpi: Refuse to load on machines with
> >> buggy INFO implementations") denied loading on laptops with a WMI Event
> >> GUID given that such laptops manage the hotkeys via that interface,
> >> however, such laptops have a working Toshiba Configuration Interface
> >> (TCI), and thus, such commit denied several supported features.
> >>
> >> This patch avoids registering the input device and ignores all hotkey
> >> events on laptops with such WMI Event GUI, making the supported
> >
> > GUID
> >
> >> features found in those laptops to work.
> >>
> >> Signed-off-by: Azael Avalos <coproscefalo@...il.com>
> >> ---
> >>  drivers/platform/x86/toshiba_acpi.c | 21 +++++++++++++--------
> >>  1 file changed, 13 insertions(+), 8 deletions(-)
> >>
> >> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> >> index 15d8f0d..a3c6ea2 100644
> >> --- a/drivers/platform/x86/toshiba_acpi.c
> >> +++ b/drivers/platform/x86/toshiba_acpi.c
> >> @@ -2397,6 +2397,11 @@ static int toshiba_acpi_setup_keyboard(struct toshiba_acpi_dev *dev)
> >>       u32 hci_result;
> >>       int error;
> >>
> >> +     if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID)) {
> >> +             pr_info("WMI event detected, hotkeys won't be monitored\n");
> >
> > It's best practice to avoid contractions in any form of technical writing. (See
> > what I did there? ;-)
> >
> > While this is good for comments, I feel it's more important for kernel messages.
> >
> >> +             return 0;
> >> +     }
> >> +
> >>       error = toshiba_acpi_enable_hotkeys(dev);
> >>       if (error)
> >>               return error;
> >> @@ -2730,6 +2735,14 @@ static void toshiba_acpi_notify(struct acpi_device *acpi_dev, u32 event)
> >>
> >>       switch (event) {
> >>       case 0x80: /* Hotkeys and some system events */
> >> +             /*
> >> +              * Machines with this WMI guid aren't supported due to bugs in
> >> +              * their AML.
> >> +              *
> >> +              * Return silently to avoid triggering a netlink event.
> >> +              */
> >> +             if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
> >> +                     return;
> >>               toshiba_acpi_process_hotkeys(dev);
> >>               break;
> >>       case 0x81: /* Dock events */
> >> @@ -2816,14 +2829,6 @@ static int __init toshiba_acpi_init(void)
> >>  {
> >>       int ret;
> >>
> >> -     /*
> >> -      * Machines with this WMI guid aren't supported due to bugs in
> >
> > Good idea to capitalize acronyms like GUID.
> >
> >> -      * their AML. This check relies on wmi initializing before
> >> -      * toshiba_acpi to guarantee guids have been identified.
> >> -      */
> >> -     if (wmi_has_guid(TOSHIBA_WMI_EVENT_GUID))
> >> -             return -ENODEV;
> >> -
> >>       toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
> >>       if (!toshiba_proc_dir) {
> >>               pr_err("Unable to create proc dir " PROC_TOSHIBA "\n");
> >> --
> >> 2.4.3
> >>
> >>
> >
> > Functional content looks good. No need to resend, just please keep the above in
> > mind for the future. I'll make the minor updates and merge all three after your
> > response to the first regarding user:kernel interface - unless of course you
> > choose to resend the 3 at the same time, and I'll pick those up.
> 
> OK, will keep those things in mind, will wait for comments on first patch and
> send a v2.
> 

I believe I've responded to all the patches in my queue from you. If I'm missing
one, please let me know which one. I have 4 pending from you. If you send a v2,
would you just send all 4 to avoid any confusion?

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center
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