linux-kernel - Re: [PATCH 04/12] hdaps: Correct readout and remove nonsensical attributes

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Message-ID: <20060807140721.GH4032@ucw.cz>
Date:	Mon, 7 Aug 2006 14:07:21 +0000
From:	Pavel Machek <pavel@...e.cz>
To:	Shem Multinymous <multinymous@...il.com>
Cc:	Robert Love <rlove@...ve.org>, Jean Delvare <khali@...ux-fr.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, hdaps-devel@...ts.sourceforge.net
Subject: Re: [PATCH 04/12] hdaps: Correct readout and remove nonsensical attributes

Hi!

> The current hdaps driver got some details wrong about the result of
> hardware queries. 
> 
> First, it fails to check a couple of status values.
> 
> Second, it turns out that the hardware will return up to two readouts:
> the latest one and also the previous one if it was missed (host didn't
> poll fast enough). The current driver wrongly interprets the latter as
> a "variance", which is nonsensical. We have no use for that previous
> readout, so it should be ignored.
> 
> This patch adds proper status checking, and removes the "variance" and
> "temp2" sysfs attributes which refer to the old readout.
> 
> Signed-off-by: Shem Multinymous <multinymous@...il.com>

Signed-off-by: Pavel Machek <pavel@...e.cz>

> +	if (data.val[EC_ACCEL_IDX_READOUTS]<1)

Could we get spaces around '<'?

> +	int total, ret;
> +	for (total=READ_TIMEOUT_MSECS; total>0; total-=RETRY_MSECS) {

Could we go from 0 to timeout, not the other way around?

>  static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
> -static DEVICE_ATTR(variance, 0444, hdaps_variance_show, NULL);
>  static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
> -static DEVICE_ATTR(temp2, 0444, hdaps_temp2_show, NULL);
> +  /* "temp1" instead of "temperature" is hwmon convention */
>  static DEVICE_ATTR(keyboard_activity, 0444, hdaps_keyboard_activity_show, NULL);
>  static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
>  static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);

This actually changes userland interface... but that is probably okay.

							Pavel
-- 
Thanks for all the (sleeping) penguins.
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