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authorIl Han <corone.il.han@gmail.com>2015-08-30 14:44:26 +0300
committerGuenter Roeck <linux@roeck-us.net>2015-10-14 17:57:14 +0300
commit195a4b4298a7951c845dac2b326585c66add3435 (patch)
treeea2e8e46af138e75ccc0f36f0d5f4d40958496d7 /Documentation/hwmon
parent25cb62b76430a91cc6195f902e61c2cb84ade622 (diff)
downloadlinux-195a4b4298a7951c845dac2b326585c66add3435.tar.xz
hwmon: Driver for Maxim MAX31790
The driver supports the Maxim MAX31790. Signed-off-by: Il Han <corone.il.han@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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+Kernel driver max31790
+======================
+
+Supported chips:
+ * Maxim MAX31790
+ Prefix: 'max31790'
+ Addresses scanned: -
+ Datasheet: http://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, 1=manual mode, 2=rpm mode
+pwm[1-6] RW fan target duty cycle (0-255)