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Message-Id: <200909022312.58494.rjw@sisk.pl> Date: Wed, 2 Sep 2009 23:12:58 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Pavel Machek <pavel@....cz> Cc: Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "linux-acpi" <linux-acpi@...r.kernel.org>, Greg KH <greg@...ah.com> Subject: Re: [PATCH V6 1/2] introduce ALS sysfs class On Tuesday 01 September 2009, Pavel Machek wrote: > > > > > IMO, 0 and -1 are not errors. they just suggest that the Ambient Light > > > > illuminance is beyond the device support range, while the device is > > > > still working normally. > > > > what about exporting these values (0 and -1) to user space directly? > > > > > > Returning 0 for "below" range and 99999999 for "above" range would be > > > nice, yes. > > > > Why not 0 and "all ones" or 0 and -1. > > > > Is there anything wrong with -1 in particular? > > Normal people expect -1 to be less than 123, and output is in ascii. If > you make it ((unsigned) ~0) I guess that becomes acceptable. Well, "-1" is a perfectly valid alphanumerical representation of an int. I don't really see the problem with the "-", unless we're talking about some broken user space, that is. Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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