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

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Date:	Mon, 20 Jul 2015 14:55:03 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	Azael Avalos <coproscefalo@...il.com>
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] toshiba_acpi: Avoid registering input device on WMI
 event laptops

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.

Thanks Azael,

-- 
Darren Hart
Intel Open Source Technology Center
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