summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/max31790.rst
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/hwmon/max31790.rst')
-rw-r--r--Documentation/hwmon/max31790.rst44
1 files changed, 44 insertions, 0 deletions
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
new file mode 100644
index 000000000..7b097c3b9
--- /dev/null
+++ b/Documentation/hwmon/max31790.rst
@@ -0,0 +1,44 @@
+Kernel driver max31790
+======================
+
+Supported chips:
+
+ * Maxim MAX31790
+
+ Prefix: 'max31790'
+
+ Addresses scanned: -
+
+ Datasheet: https://pdfserv.maximintegrated.com/en/ds/MAX31790.pdf
+
+Author: Il Han <corone.il.han@gmail.com>
+
+
+Description
+-----------
+
+This driver implements support for the Maxim MAX31790 chip.
+
+The MAX31790 controls the speeds of up to six fans using six independent
+PWM outputs. The desired fan speeds (or PWM duty cycles) are written
+through the I2C interface. The outputs drive "4-wire" fans directly,
+or can be used to modulate the fan's power terminals using an external
+pass transistor.
+
+Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%)
+monitoring and control of fan RPM as well as detection of fan failure.
+Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
+also be configured to serve as tachometer inputs.
+
+
+Sysfs entries
+-------------
+
+================== === =======================================================
+fan[1-12]_input RO fan tachometer speed in RPM
+fan[1-12]_fault RO fan experienced fault
+fan[1-6]_target RW desired fan speed in RPM
+pwm[1-6]_enable RW regulator mode, 0=disabled (duty cycle=0%), 1=manual mode, 2=rpm mode
+pwm[1-6] RW read: current pwm duty cycle,
+ write: target pwm duty cycle (0-255)
+================== === =======================================================