On Tue, 2012-02-07 at 17:52 +0530, Ashish Jangam wrote:
> Can you consider adding yourself or David as maintainer ? Not a must,
> but no one else would really be able to support the driver.
Thank for this, you can add my name.
> > +Supported chips:
> > + * Dialog Semiconductors DA9052-BC and DA9053-AA/Bx PMICs
> > + Prefix: 'da9052'
> > + Datasheet: Kindly visit www.dialog-semiconductor.com and request for
> > the
> > + official datasheet.
> > +
> Maybe, but that doesn't seem to be straightforward. The web site has no
> search field, and I am not sure who to contact in the contact list. And
> since there does not seem to be support in the US, I am not sure if one
> is expected to contact someone in Europe or Taiwan or some other place.
>
> Maybe you can let me know how exactly to get the datasheets - I like to
> keep those around for chips we are supporting.
You need to request for DA9052/53 datasheet from
www.dialog-semiconductor.com/DA9053.php
>
> > +static ssize_t da9052_read_tjunc(struct device *dev,
> > + struct device_attribute *devattr, char
> > *buf)
> > +{
> > + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> > + int tjunc, toffset, result;
> > +
> > + tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
> > + if (tjunc < 0)
> > + return tjunc;
> > +
> > + toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
> > + if (toffset < 0)
> > + return toffset;
> > +
> > + if ((tjunc - toffset) == 0)
> > + result = 0;
> > + else
> > + /* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
> > */
> > + result = 1708 * (tjunc - toffset) - 108800;
> > +
>
> Hmm.
> tjunc = 1, toffset = 2:
> return 1708 * (-1) - 108800 = -108800 - 1708 = -110508
> tjunc = 2, toffset = 2:
> return 0
> tjunc = 3, toffset = 2:
> return 1780 * 1 - 108800 = -108800 + 1708 = -107092
>
> I am not saying this is wrong, not having access to the data sheet, but
> it is a bit odd. Why is the 0-difference case handled differently, and
> why does it return 0 and not, say, -108800 ?
>
> If tjunc - toffset < 0 is invalid (no idea if it is, of course), it
> might make sense to detect that condition.
toffset is the trim value used for improving the calculated temperature
accuracy so considering this tjunc - toffset <=0 seems to be not
applicable cases. I will correct this along with your other comments and
will re-submit the patch.
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