Re: [PATCH 03/12] hdaps: Unify and cache hdaps readouts

["Shem Multinymous" <multinymous@gmail.com>]

On 8/8/06, Pavel Machek <pavel@suse.cz> wrote:
> Okay, so what about ..
>
> #define CONVERT(x) *(s16*)(data.val+x) * (hdaps_invert?-1:1);
>
> ...or better inline function?

Actually, some models require fancier transformations. This was
supposed to be reserved for a future patch, but might as well prepare
the infrastructure:

/* Some models require an axis transformation to the standard reprsentation */
static void transform_axes(int inx, int iny, int *outx, int *outy) {
	*outx = inx * (hdaps_invert?-1:1);
	*outy = iny * (hdaps_invert?-1:1);
}
...
	/* Parse position data: */
	transform_axes(*(s16*)(data.val+EC_ACCEL_IDX_XPOS1),
	               *(s16*)(data.val+EC_ACCEL_IDX_YPOS1), &pos_x, &pos_y);

	/* Parse so-called "variance" data: */
	transform_axes(*(s16*)(data.val+EC_ACCEL_IDX_XPOS2),
	               *(s16*)(data.val+EC_ACCEL_IDX_YPOS2), &var_x, &var_y);


 Shem
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