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

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Message-ID: <20180706111628.mvh46mg6ctqia3iz@earth.universe>
Date:   Fri, 6 Jul 2018 13:16:28 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Pavel Machek <pavel@....cz>
Cc:     Ladislav Michl <ladis@...ux-mips.org>,
        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, nekit1000@...il.com,
        mpartap@....net, merlijn@...zup.org
Subject: Re: droid 4: connection refused from voltage_now

Hi,

On Wed, Jul 04, 2018 at 09:52:38PM +0200, Pavel Machek wrote:
> 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

The error above is obviously generated by cpcap_adc and only
propageted by cpcap_battery. Have a look for -ETIMEDOUT (-110)
in drivers/iio/adc/cpcap-adc.c.

-- Sebastian

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