|author||Michael Arndt <firstname.lastname@example.org>||2013-02-17 20:51:20 +0100|
|committer||Greg Kroah-Hartman <email@example.com>||2013-02-18 13:55:24 -0800|
w1: w1_therm: Add force-pullup option for "broken" sensors
Signed-off-by: Michael Arndt <firstname.lastname@example.org> Acked-by: Evgeniy Polyakov <email@example.com> Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
Diffstat (limited to 'Documentation/w1')
1 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/w1/slaves/w1_therm b/Documentation/w1/slaves/w1_therm
index 874a8ca93feb..cc62a95e4776 100644
@@ -34,9 +34,16 @@ currently supported. The driver also doesn't support reduced
precision (which would also reduce the conversion time).
The module parameter strong_pullup can be set to 0 to disable the
-strong pullup or 1 to enable. If enabled the 5V strong pullup will be
-enabled when the conversion is taking place provided the master driver
-must support the strong pullup (or it falls back to a pullup
+strong pullup, 1 to enable autodetection or 2 to force strong pullup.
+In case of autodetection, the driver will use the "READ POWER SUPPLY"
+command to check if there are pariste powered devices on the bus.
+If so, it will activate the master's strong pullup.
+In case the detection of parasite devices using this command fails
+(seems to be the case with some DS18S20) the strong pullup can
+If the strong pullup is enabled, the master's strong pullup will be
+driven when the conversion is taking place, provided the master driver
+does support the strong pullup (or it falls back to a pullup
resistor). The DS18b20 temperature sensor specification lists a
maximum current draw of 1.5mA and that a 5k pullup resistor is not
sufficient. The strong pullup is designed to provide the additional