linux-kernel - Re: [PATCH] platform: x86: dell-laptop: Add support for keyboard backlight

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Date:	Fri, 21 Nov 2014 14:09:40 -0800
From:	Darren Hart <dvhart@...radead.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	libsmbios-devel@...ts.us.dell.com, Srinivas_G_Gowda@...l.com,
	Michael_E_Brown@...l.com,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	Linux ACPI Mailing List <linux-acpi@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...el.com>
Subject: Re: [PATCH] platform: x86: dell-laptop: Add support for keyboard
 backlight

On Sat, Nov 22, 2014 at 07:46:25PM +0100, Pali Rohár wrote:

> > > 0   Completed successfully
> > > -1  Completed with error
> > > -2  Function not supported
> > > 
> > > So we can return something other too (not always -EINVAL).
> > > Do you have any idea which errno should we return for -1
> > > and -2?
> > 
> > For -1, I should think  -EIO (I/O Error)
> > For -2, I'd expect -ENXIO (No such device or address)
> > 
> 
> What about -ENOSYS for -2?

No. This specific topic came up at kernel summit this year. ENOSYS is
specifically for not implemented system calls.

> 
> > > > > +	if (convert) {
> > > > > +		/* NOTE: this switch fall down */
> > > > 
> > > > "fall down" ? As in, it intentionally doesn't have breaks?
> > > 
> > > This code convert "value" in "units" to new value in minutes
> > > units. So for unit == days it is: 24*60*60... So no breaks.
> > 
> > Right, so the language of the comment just wasn't clear, try:
> > 
> > /* Convert value from seconds to minutes */
> > 
> 
> Err... to seconds :-) But OK, I will change comment.

Oops, duh.

/* Convert value from current units to seconds. */

> 
> > > > > +		switch (unit) {
> > > > > +		case KBD_TIMEOUT_DAYS:
> > > > > +			value *= 24;
> > > > > +		case KBD_TIMEOUT_HOURS:
> > > > > +			value *= 60;
> > > > > +		case KBD_TIMEOUT_MINUTES:
> > > > > +			value *= 60;
> > > > > +			unit = KBD_TIMEOUT_SECONDS;
> > > > > +	 	}

-- 
Darren Hart
Intel Open Source Technology Center
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