From: Pavel Machek <pavel@ucw.cz>
To: Bill Gatliff <bgat@billgatliff.com>
Cc: linux-embedded@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PWM PATCH 2/5] Emulates PWM hardware using a high-resolution timer and a GPIO pin
Date: Thu, 11 Feb 2010 21:58:01 +0100 [thread overview]
Message-ID: <20100211205801.GA29159@elf.ucw.cz> (raw)
In-Reply-To: <4B746A02.9060306@billgatliff.com>
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
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2010-02-11 20:58 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-02 7:14 [PWM PATCH 0/5] Implements a common PWM API Bill Gatliff
2010-02-02 7:14 ` [PWM PATCH 1/5] API to consolidate PWM devices behind a common user and kernel interface Bill Gatliff
2010-02-02 18:20 ` H Hartley Sweeten
2010-02-03 4:12 ` Bill Gatliff
2010-02-04 1:39 ` H Hartley Sweeten
2010-02-04 5:31 ` Bill Gatliff
2010-02-04 17:30 ` Bill Gatliff
2010-02-11 20:04 ` Pavel Machek
2010-02-11 20:51 ` Bill Gatliff
2010-02-11 21:00 ` Pavel Machek
2010-02-02 7:14 ` [PWM PATCH 2/5] Emulates PWM hardware using a high-resolution timer and a GPIO pin Bill Gatliff
2010-02-11 20:07 ` Pavel Machek
2010-02-11 20:35 ` Bill Gatliff
2010-02-11 20:58 ` Pavel Machek [this message]
2010-02-12 7:22 ` Stanislav O. Bezzubtsev
2010-02-12 13:13 ` Geert Uytterhoeven
2010-02-12 13:41 ` Pavel Machek
2010-02-12 13:53 ` H Hartley Sweeten
2010-02-12 16:26 ` Bill Gatliff
2010-02-16 18:12 ` H Hartley Sweeten
2010-02-02 7:14 ` [PWM PATCH 3/5] Expunge old Atmel PWMC driver, replacing it with one that conforms to the PWM API Bill Gatliff
2010-02-02 7:16 ` Bill Gatliff
2010-02-02 17:52 ` H Hartley Sweeten
2010-02-03 4:10 ` Bill Gatliff
2010-02-02 7:14 ` [PWM PATCH 4/5] PWM-based LED control Bill Gatliff
2010-02-02 7:14 ` [PWM PATCH 5/5] LED "dimmer" trigger Bill Gatliff
2010-02-02 17:44 ` [PWM PATCH 0/5] Implements a common PWM API H Hartley Sweeten
2010-02-03 4:08 ` Bill Gatliff
2010-02-04 23:20 ` H Hartley Sweeten
2010-02-05 18:53 ` Bill Gatliff
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