From: Bill Gatliff <bgat@billgatliff.com>
To: Pavel Machek <pavel@ucw.cz>
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 14:35:14 -0600 [thread overview]
Message-ID: <4B746A02.9060306@billgatliff.com> (raw)
In-Reply-To: <20100211200702.GB1487@ucw.cz>
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.
b.g.
--
Bill Gatliff
Embedded systems training and consulting
http://billgatliff.com
bgat@billgatliff.com
next prev parent reply other threads:[~2010-02-11 20:35 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 [this message]
2010-02-11 20:58 ` Pavel Machek
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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