summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/lm90
diff options
context:
space:
mode:
authorJean Delvare <khali@linux-fr.org>2010-03-05 22:17:15 +0100
committerJean Delvare <khali@linux-fr.org>2010-03-05 22:17:15 +0100
commit53de33427fa3d7dd62cc5ec75ce0d4e6c6d602dd (patch)
tree82a1fd88a2d132b534fe3df3e2ea536c1b5099ae /Documentation/hwmon/lm90
parent95238364167edaf93ce2890e5f55326b63194851 (diff)
downloadop-kernel-dev-53de33427fa3d7dd62cc5ec75ce0d4e6c6d602dd.zip
op-kernel-dev-53de33427fa3d7dd62cc5ec75ce0d4e6c6d602dd.tar.gz
hwmon: (lm90) Add SMBus alert support
Tested successfully with an ADM1032 chip on its evaluation board. It should work fine with all other chips as well. At this point this is more of a proof-of-concept, we don't do anything terribly useful on SMBus alert: we simply log the event. But this could later evolve into libsensors signaling so that user-space applications can take an appropriate action. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Trent Piepho <tpiepho@freescale.com>
Diffstat (limited to 'Documentation/hwmon/lm90')
-rw-r--r--Documentation/hwmon/lm9012
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
index 08106ad..6a03dd4 100644
--- a/Documentation/hwmon/lm90
+++ b/Documentation/hwmon/lm90
@@ -173,6 +173,18 @@ The lm90 driver will not update its values more frequently than every
other second; reading them more often will do no harm, but will return
'old' values.
+SMBus Alert Support
+-------------------
+
+This driver has basic support for SMBus alert. When an alert is received,
+the status register is read and the faulty temperature channel is logged.
+
+The Analog Devices chips (ADM1032 and ADT7461) do not implement the SMBus
+alert protocol properly so additional care is needed: the ALERT output is
+disabled when an alert is received, and is re-enabled only when the alarm
+is gone. Otherwise the chip would block alerts from other chips in the bus
+as long as the alarm is active.
+
PEC Support
-----------
OpenPOWER on IntegriCloud