linux-kernel - Re: [PATCH 1/2] Staging: comedi: introduce outl_1564_* and inl_1564_* helper functions in hwdrv

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Date:	Sat, 1 Mar 2014 15:44:18 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Chase Southwood <chase.southwood@...oo.com>
Cc:	gregkh@...uxfoundation.org, abbotti@....co.uk,
	hsweeten@...ionengravers.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Staging: comedi: introduce outl_1564_* and
 inl_1564_* helper functions in hwdrv_apci1564.c

On Sat, Mar 01, 2014 at 04:28:27AM -0600, Chase Southwood wrote:
> This patch introduces a handful of outl and inl helper functions with the
> ultimate goal of improving code readability and allowing several lines
> which violate the character limit to be shortened in a sane way.
> 
> Cc: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Chase Southwood <chase.southwood@...oo.com>
> ---
> This patchset serves as a replacement to my previous cleanup patchset for
> hwdrv_apci1564.c
> 
> Dan,
> After spending a little bit more time with this and trying out different
> ways of cleaning this up, I decided that making helper functions for all
> of the most common register sets would look the best, but I haven't made
> a helper for a few of the least common inl/outl calls because if I did,
> the sheer number of helper functions would get quite ridiculous.
> Let me know if you think my selections of what to make into helper
> functions seems appropriate.
> 

Yeah.  You're right...  It's kind of a lot of helper functions.

I wonder if we could just do something like:

static void outl_amcc(struct addi_private *devpriv, unsigned int cmd,
		      unsigned int reg)
{
	outl(cmd, devpriv->i_IobaseAmcc + APCI1564_DIGITAL_IP + reg);
}

And then change APCI1564_DIGITAL_IP_INTERRUPT_MODE1 to be:

#define APCI1564_DIGITAL_IP_INTERRUPT_MODE1 (0x4 + 0x4)

The only problem with that would be i_APCI1564_Reset().  Is
i_APCI1564_Reset() buggy?  Ian or Hartley might know.  Take a look at
other comedi drivers as well to see what they do.

regards,
dan carpenter

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