Thanks Jean for your kind response.
Yes I could see some entries under /sys/class/hwmon/hwmon0
hwmon0 is probed well at boot time but I couldn't see hwmon1 is probed at
boot time?
Is it because of only one reg =<0x49> entry in dts file?
Also it would be great if you can point me out any example where temp from
lm73 sensor is read by sysfs?
I am sure some one has already worked on it.
Thanks
On Sun, Mar 2, 2014 at 6:43 AM, Jean Delvare <jdelvare@xxxxxxx> wrote:
> Hi Dean,
>
> On Sat, 1 Mar 2014 23:30:33 -0800, Romanic Dean wrote:
> > Hi all,
> >
> > I am working with 3.8 version of kernel and its device tree driven kernel
> > I wanted to read temperature from lm73 sensor.It should happen from user
> > land application.
> >
> > Now first of all have enabled the dts support for lm73 device by adding
> > below in my dts file
> >
> > dtt@49 {
> > compatible = "lm73";
> > reg = <0x49>;
> > };
> >
> > and kernel driver compiled is lm73.o .
> >
> > I could see in my boot logs that driver's probe method is called ,so now
> > how DO I confirm that lm73 device is Probed OK and usable?
>
> You can look under /sys/class/hwmon, one of the entries should be for your
> LM73 chip.
>
> > Now if it initialized OK then what all expected entries I should see in
> > /sys/bus/i2c/devices file system?
>
> That would be looking at the wrong place. What you are interested in is
> the hwmon interface exposed by the lm73 driver, not the I2C bus side of
> things. /sys/class/hwmon is the place to explore.
>
> > How Do I read temperature from lm73 sensor using sysfs in userspace?
>
> Using "sensors" or any other libsensors-based application. Both
> libsensors and sensors come from lm-sensors, but exact packaging
> details vary from one distribution to the next (e.g. on openSUSE you'd
> install "sensors" and let it draw libsensors4 as a dependency.)
>
> Hope that helps,
> --
> Jean Delvare
> SUSE L3 Support
>
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