linux-kernel - Re: [PATCH 08/12] hdaps: Add explicit hardware configuration functions

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Date:	Tue, 8 Aug 2006 12:16:19 +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 08/12] hdaps: Add explicit hardware configuration functions

Hi!

> This adds functions for configuring accelerometer-related hardware 
> parameters in the hdaps driver, and changes the init function to
> use these functions instead of opaque magic numbers.
> The parameters are configured via variables instead of constants
> since a later patch will add sysfs attributes for changing them.
> 
> A few of these functions aren't used yet, but will be used by later
> patches.
> 
> Signed-off-by: Shem Multinymous <multinymous@...il.com>

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

> @@ -68,6 +67,13 @@ static struct input_dev *hdaps_idev;
>  static unsigned int hdaps_invert;
>  static int needs_calibration = 0;

Unneccessary initializer.

> +/* Configuration: */
> +static int sampling_rate = 50;       /* Sampling rate  */
> +static int oversampling_ratio = 5;   /* Ratio between our sampling rate and 
> +                                      * EC accelerometer sampling rate      */
> +static int running_avg_filter_order = 2; /* EC running average filter order */
> +static int fake_data_mode = 0;       /* Enable EC fake data mode? */

Here too.

> @@ -162,6 +168,137 @@ static int hdaps_update(void)
>  }
>  
>  /*
> + * hdaps_set_power - enable or disable power to the accelerometer.
> + * Returns zero on success and negative error code on failure.  Can sleep.
> + */
> +static int hdaps_set_power(int on) {

{ on new line, kernel-doc.

> +/*
> + * hdaps_set_fake_data_mode - enable or disable EC test mode, which fakes 
> + * accelerometer data using an incrementing counter.
> + * Returns zero on success and negative error code on failure.  Can sleep.
> + */

Why do we want to have fake mode? I see it is useful for debugging,
but?

> +/*
> + * hdaps_check_ec - checks something about the EC.
> + * Follows the clean-room spec for HDAPS; we don't know what it means.
> + * Returns zero on success and negative error code on failure.  Can sleep.
> + */

URL for spec?

What happens when we delete this one?

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