IEEE-754 Float to int

[Lucas Tanure]

On Tue, Nov 22, 2016 at 4:39 PM, Greg KH <greg at kroah.com> wrote:

> On Tue, Nov 22, 2016 at 04:05:18PM +0000, Lucas Tanure wrote:
> > Hi,
> >
> > At some point my hardware gives me a 32bit IEEE-754 float, like this :
> >
> >
> > regmap_read(device->regmap, ADDR0, &temp);
> >
> > value = temp << 16;
> >
> > regmap_read(device->regmap, ADDR1, &temp);
> >
> > value |= temp;
> >
> >
> > So, value has a 32bit float now, and I would like to print just the
> integer
> > part, like :
> > Read 26.92387 --> Print 26.
> > Simple, no float operations.
> >
> > How I can do it ?
>
> Just print the upper 16 bits shifted right by 16 bits.


> But why would you want to print the value anyway?  Who would use it?
>
My hardware gives me the board temperature as a float 32bits.
And the hwmon sysfs api asks me to return the temperature as millidegree
Celsius.

To follow the hwmon sysfs api rules
<https://www.kernel.org/doc/Documentation/thermal/sysfs-api.txt>, I need to
get my float, multiply by 1000 and print the integer part.
There is a better way to do that ?


> thanks,
>
> greg k-h
>

Thanks

-- 
Lucas Tanure
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