linux-kernel - Re: droid 4: connection refused from voltage

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Date:   Wed, 4 Jul 2018 21:52:38 +0200
From:   Pavel Machek <pavel@....cz>
To:     Ladislav Michl <ladis@...ux-mips.org>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-pm@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, sre@...nel.org,
        nekit1000@...il.com, mpartap@....net, merlijn@...zup.org
Subject: Re: droid 4: connection refused from voltage_now

On Wed 2018-07-04 21:45:56, Ladislav Michl wrote:
> On Wed, Jul 04, 2018 at 07:11:56PM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > I started to use droid 4 as my primary phone... so I have battery
> > monitor running for hours... Once every few days it dies with
> > "connection refused" error reading battery's "voltage_now". I restart
> > it and it continues working...
> 
> Ha! What exactly that "connection refused" means? Is it ECONNREFUSED (111)?
> I have custom at91 based board here with few custom power supply drivers
> and it sometimes ends with voltage_now of my driver being unreadable.
> (I modified userspace code and waiting what's in errno in case
> reading fails)

It seems to be -110:
Jul  4 11:48:29 devuan kernel: [ 2908.602600] cpcap_adc cpcap_adc.0:
error reading ADC: -110
Jul  4 11:48:29 devuan kernel: [ 2908.608123] cpcap_battery
cpcap_battery.0: cpcap_battery_get_current failed: -110
Jul  4 11:48:30 devuan kernel: [ 2908.922576] cpcap_adc cpcap_adc.0:
error reading ADC: -110
Jul  4 11:48:30 devuan kernel: [ 2908.928100] cpcap_battery
cpcap_battery.0: cpcap_charger_battery_temperature failed: -110
Jul  4 11:48:30 devuan kernel: [ 2908.936340] power_supply battery:
driver failed to report `voltage_now' property: -110

> Adding linux-pm@...r.kernel.org as it seems to be subsytem, specific.

Good idea. Thanks!
									pavel

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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