From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: From: "thilo.cestonaro@ts.fujitsu.com" To: "linux@roeck-us.net" , "linux-hwmon@vger.kernel.org" Subject: Re: [PATCH] added kernel module for FTS sensor chip "Teutates" Date: Tue, 7 Jun 2016 07:39:21 +0000 Message-ID: <1465284992.18490.4.camel@ts.fujitsu.com> References: <1464684950-31113-1-git-send-email-thilo.cestonaro@ts.fujitsu.com> <57526C5B.9000104@roeck-us.net> <1465204713.5580.25.camel@ts.fujitsu.com> <57563D00.3030005@roeck-us.net> In-Reply-To: <57563D00.3030005@roeck-us.net> Reply-To: "thilo.cestonaro@ts.fujitsu.com" Content-Language: en-US Content-Type: multipart/signed; micalg=sha-1; protocol="application/x-pkcs7-signature"; boundary="=-RqzO+ee7qkP/akC3MyAK" MIME-Version: 1.0 List-ID: --=-RqzO+ee7qkP/akC3MyAK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mo, 2016-06-06 at 20:18 -0700, Guenter Roeck wrote: > On 06/06/2016 02:21 AM, thilo.cestonaro@ts.fujitsu.com wrote: > >=20 > > Hey Guenter! > >=20 > > Thanks for your patience and very detailed review! > > I will change the code to address all you hints where no discussion is = needed. > > The others follow down here. > >=20 > > On Fr, 2016-06-03 at 22:51 -0700, Guenter Roeck wrote: > > >=20 > > > >=20 > > > > +#define FTSTEUTATES_WATCHDOG_RESOLUTION =C2=A0=C2=A0=C2=A060 > > > > + > > > 60 seconds (minimum) resolution ? Really ? This is very unusual. > > Will double check and talk to the hw guy. There is a register which sets the resolution to 1sec. but it wasn't docume= nted :(. So next "version" will have 1sec. resolution. > > > > +static ssize_t show_fan_fault(struct device *dev, > > > > + struct device_attribute *devattr, char *buf) > > > > +{ > > > > + int index =3D to_sensor_dev_attr(devattr)->index; > > > > + struct ftsteutates_data *data =3D ftsteutates_update_device(dev); > > > > + > > > > + return sprintf(buf, "%d\n", data->fan_present[index] =3D=3D 1 ? 0= : 1); > > > A non-present fan does not indicate a fan fault. > > For me a fan fault was a not existing fan, as the alarm is handled via = fan_alarm. > > What is the understanding of fan_fault and fan_alarm? > >=20 > Some fan controllers can detect if a fan is faulty, for example if it con= sumes > power but does not turn. Unless you know for sure that a fan is faulty, d= on't > report that it is. A non-existing fan is definitely not faulty. About the presence register from Teutates Spec: The present-detection is done by checking the Fan-Speed. If the fan-speed is 0 or below fan-fault-speed all the time, the fan will be handled as not present. If the fan-speed is greater than fan-fault-speed, the fan is handled as present. So the presence is the faulty fan detection? 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