linux-kernel - Re: [PWM PATCH 2/5] Emulates PWM hardware using a high-resolution timer and a GPIO pin

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Message-ID: <20100211205801.GA29159@elf.ucw.cz>
Date:	Thu, 11 Feb 2010 21:58:01 +0100
From:	Pavel Machek <pavel@....cz>
To:	Bill Gatliff <bgat@...lgatliff.com>
Cc:	linux-embedded@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PWM PATCH 2/5] Emulates PWM hardware using a high-resolution
 timer and a GPIO pin

On Thu 2010-02-11 14:35:14, Bill Gatliff wrote:
> Pavel Machek wrote:
> >> +static void
> >> +gpio_pwm_work (struct work_struct *work)
> >> +{
> >> +	struct gpio_pwm *gp = container_of(work, struct gpio_pwm, work);
> >> +
> >> +	if (gp->active)
> >> +		gpio_direction_output(gp->gpio, gp->polarity ? 1 : 0);
> >> +	else
> >> +		gpio_direction_output(gp->gpio, gp->polarity ? 0 : 1);
> >> +}
> >>     
> >
> > ...polarity ^ active ?
> >   
> 
> ... except that if polarity and/or active are >1, I don't send the
> values 1 or 0 to gpio_direction_output.  I don't know if the API is
> specifically intended to accept nonzero values that are greater than 1.

!polarity ^ !active ? :-).
									Pavel

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