From: Simon Guinot <simon@sequanux.org>
To: lm-sensors@vger.kernel.org
Subject: Re: [lm-sensors] hwmon and GPIO fan
Date: Tue, 12 Oct 2010 08:05:56 +0000 [thread overview]
Message-ID: <20101012080556.GE13596@kw.sim.vm.gnt> (raw)
In-Reply-To: <20101011142558.GD13596@kw.sim.vm.gnt>
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On Mon, Oct 11, 2010 at 04:45:32PM +0200, Jean Delvare wrote:
> Salut Simon,
>
> On Mon, 11 Oct 2010 14:25:58 +0000, Simon Guinot wrote:
> > I am currently looking to add hwmon support for the fan device found on
> > Network Space Max v2 boards (ARM Kirkwood SoC).
> >
> > The fan speed can be configured trough GPIOs. The GPIO settings allow to
> > change the fan input voltage (via some resistors).
> > After a quick look at the hwmon sysfs interface, I have failed to find
> > the appropriate way to expose a non-pwm fan. If any, what is the
> > dedicated sysfs entry to set speed for a non-pwm fan ?
> > Maybe that a fake pwm interface is needed ?
>
> Don't let yourself be fooled by the "pwm[1-n]" and "pwm[1_n]_enable"
> files names. These are valid for all fan control outputs, be they PWM
> or DC. As a matter of fact, "pwm[1-n]_mode" lets you advertise whether
> the controller is using PWM or DC.
>
> All that really matters is that you use 0-255 as the pwm[1-n] range
> matching 0-100%.
Thank you.
Simon
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prev parent reply other threads:[~2010-10-12 8:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-11 14:25 [lm-sensors] hwmon and GPIO fan Simon Guinot
2010-10-11 14:45 ` Jean Delvare
2010-10-12 8:05 ` Simon Guinot [this message]
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