Re: [lm-sensors] sensors-detect:: Drop detection of DS1621-like chips

[Robert Coulson <rob.coulson@gmail.com>]

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Agreed.

Thank you Jean. Since the ds1621 detection is being dropped, is the
doc/chips/SUMMARY ds1621 reference necessary? If not, then please also
remove it too.

thanks,

Rob.


On Mon, May 20, 2013 at 6:26 AM, Guenter Roeck <linux@roeck-us.net> wrote:

> On Mon, May 20, 2013 at 02:15:25PM +0200, Jean Delvare wrote:
> > Detection of the Dallas/Maxim DS1621, DS1625 and DS1631 chips is weak
> > and likely to result in false positives. There's no rationale for
> > keeping it in sensors-detect as these chips are not found in desktop
> > computer systems. So drop detection of these chips altogether.
> > ---
>
> Good idea.
>
> Guenter
>
> >  prog/detect/sensors-detect |   46
> ---------------------------------------------
> >  1 file changed, 46 deletions(-)
> >
> > --- lm-sensors.orig/prog/detect/sensors-detect        2013-05-20
> 13:25:33.992641174 +0200
> > +++ lm-sensors/prog/detect/sensors-detect     2013-05-20
> 14:11:21.668063379 +0200
> > @@ -803,11 +803,6 @@ use vars qw(@i2c_adapter_names);
> >               i2c_addrs => [0x2c..0x2f],
> >               i2c_detect => sub { adm9240_detect(@_, 0); },
> >       }, {
> > -             name => "Dallas Semiconductor DS1621/DS1631",
> > -             driver => "ds1621",
> > -             i2c_addrs => [0x48..0x4f],
> > -             i2c_detect => sub { ds1621_detect(@_); },
> > -     }, {
> >               name => "Dallas Semiconductor DS1780",
> >               driver => "adm9240",
> >               i2c_addrs => [0x2c..0x2f],
> > @@ -4357,47 +4352,6 @@ sub lm92_detect
> >       return ($chip == 0) ? 4 : 2;
> >  }
> >
> > -# Registers used:
> > -#   0xAA: Temperature
> > -#   0xA1: High limit
> > -#   0xA2: Low limit
> > -#   0xA8: Counter
> > -#   0xA9: Slope
> > -#   0xAC: Configuration
> > -# Detection is weak. We check if bit 4 (NVB) is clear, because it is
> > -# unlikely to be set (would mean that EEPROM is currently being
> accessed).
> > -# We also check the value of the counter and slope registers, the
> datasheet
> > -# doesn't mention the possible values but the conversion formula
> together
> > -# with experimental evidence suggest possible sanity checks.
> > -# Not all devices enjoy SMBus read word transactions, so we do as much
> as
> > -# possible with read byte transactions first, and only use read word
> > -# transactions second.
> > -sub ds1621_detect
> > -{
> > -     my ($file, $addr) = @_;
> > -
> > -     my $conf = i2c_smbus_read_byte_data($file, 0xAC);
> > -     return if ($conf & 0x10);
> > -
> > -     my $temp = i2c_smbus_read_word_data($file, 0xAA);
> > -     return if $temp < 0 || ($temp & 0x0f00);
> > -     # On the DS1631, the following two checks are too strict in theory,
> > -     # but in practice I very much doubt that anyone will set
> temperature
> > -     # limits not a multiple of 0.5 degrees C.
> > -     my $high = i2c_smbus_read_word_data($file, 0xA1);
> > -     return if $high < 0 || ($high & 0x7f00);
> > -     my $low = i2c_smbus_read_word_data($file, 0xA2);
> > -     return if $low < 0 || ($low & 0x7f00);
> > -
> > -     return if ($temp == 0 && $high == 0 && $low == 0 && $conf == 0);
> > -
> > -     # Old versions of the DS1621 apparently don't have the counter and
> > -     # slope registers (or they return crap)
> > -     my $counter = i2c_smbus_read_byte_data($file, 0xA8);
> > -     my $slope = i2c_smbus_read_byte_data($file, 0xA9);
> > -     return ($slope == 0x10 && $counter <= $slope) ? 3 : 2;
> > -}
> > -
> >  # Chip to detect: 0 = LM80, 1 = LM96080
> >  # Registers used:
> >  #   0x00: Configuration register
> >
> >
> > --
> > Jean Delvare
> >
>

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