linux-kernel - Re: [PATCH] drivers: PMC MSP71xx LED driver

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Message-Id: <20070309221348.c5ab7acc.akpm@linux-foundation.org>
Date:	Fri, 9 Mar 2007 22:13:48 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Marc St-Jean <Marc_St-Jean@...-sierra.com>
Cc:	stjeanma@...-sierra.com, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH] drivers: PMC MSP71xx LED driver

> On Fri, 9 Mar 2007 14:20:56 -0800  Marc St-Jean <Marc_St-Jean@...-sierra.com> wrote:
> 
> 
> >  > +typedef enum {
> >  > +     MSP_LED_INPUT = 0,
> >  > +     MSP_LED_OUTPUT,
> >  > +} msp_led_direction_t;
> > 
> > No typedefs, please.   Convert this to
> > 
> > enum msp_led_direction {
> >         ...
> > };
> 
> Alright I'll change it but it wasn't mentioned in the review of
> the previous drivers and they've been resubmitted with some.
> A quick search shows several drivers typedef'ing enums with and
> without *_t suffixes.

Poeple do bad things, and it sometimes gets missed.

> Is there a new style rule or are only core kernel types allowed to
> use _t?

The general rule is: no typedefs.

typedefs make sense when the underlying type can change: u64, size_t,
resource_size_t, etc.  We also use them for really hairy definitions like
filler_t.  Nothing else.  Please don't use them just to save typing.

> 
> >  > +/* Output modes */
> >  > +typedef enum {
> >  > +     MSP_LED_OFF = 0,                /* Off steady */
> >  > +     MSP_LED_ON,                             /* On steady */
> >  > +     MSP_LED_BLINK,                  /* On for initialPeriod, off 
> > for finalPeriod */
> >  > +     MSP_LED_BLINK_INVERT,   /* Off for initialPeriod, on for 
> > finalPeriod */
> >  > +} msp_led_mode_t;
> > 
> > Ditto.
> > 
> >  > +/* For non-LED pins, these macros set HI and LO accordingly */
> >  > +#define msp_led_pin_hi       msp_led_turn_off
> >  > +#define msp_led_pin_lo       msp_led_turn_on
> > 
> > eww.
> > 
> > static inline wrapper functions are preferred.  Write code in C, not cpp
> > where possible.
> 
> I agree the wrappers are cleaner but don't understand how this relates
> to C++.

cpp == C preprocessor.

It would be better to do

/*
 * nice comment goes here 
 */
static inline void msp_led_pin_hi(...)
{
	msp_led_turn_off(...);
}

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