On Wed, Aug 29, 2012 at 03:50:00PM +0100, Krystian Garbaciak wrote:

Because, for some regulators, this is required: val += fvol->offset,
I was only able to reduce it to the following form.

What on earth makes you say this?  The above is obviously linear.

Besides, you're missing several points here.  One is that you should be
using the framework features, another is that you should be implementing
_sel.

quoted

quoted

+	bits = da906x_reg_read(hw, DA906X_REG_STATUS_D);
+	if (bits < 0)
+		return IRQ_HANDLED;

quoted

If you fail to detect an interrupt you report that you handled one...?

For me there is no sensible return value for this case.

IRQ_NONE.