summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/lineage-pem.rst
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--Documentation/hwmon/lineage-pem.rst85
1 files changed, 85 insertions, 0 deletions
diff --git a/Documentation/hwmon/lineage-pem.rst b/Documentation/hwmon/lineage-pem.rst
new file mode 100644
index 0000000000..10c271dc20
--- /dev/null
+++ b/Documentation/hwmon/lineage-pem.rst
@@ -0,0 +1,85 @@
+Kernel driver lineage-pem
+=========================
+
+Supported devices:
+
+ * Lineage Compact Power Line Power Entry Modules
+
+ Prefix: 'lineage-pem'
+
+ Addresses scanned: -
+
+ Documentation:
+
+ http://www.lineagepower.com/oem/pdf/CPLI2C.pdf
+
+Author: Guenter Roeck <linux@roeck-us.net>
+
+
+Description
+-----------
+
+This driver supports various Lineage Compact Power Line DC/DC and AC/DC
+converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others.
+
+Lineage CPL power entry modules are nominally PMBus compliant. However, most
+standard PMBus commands are not supported. Specifically, all hardware monitoring
+and status reporting commands are non-standard. For this reason, a standard
+PMBus driver can not be used.
+
+
+Usage Notes
+-----------
+
+This driver does not probe for Lineage CPL devices, since there is no register
+which can be safely used to identify the chip. You will have to instantiate
+the devices explicitly.
+
+Example: the following will load the driver for a Lineage PEM at address 0x40
+on I2C bus #1::
+
+ $ modprobe lineage-pem
+ $ echo lineage-pem 0x40 > /sys/bus/i2c/devices/i2c-1/new_device
+
+All Lineage CPL power entry modules have a built-in I2C bus master selector
+(PCA9541). To ensure device access, this driver should only be used as client
+driver to the pca9541 I2C master selector driver.
+
+
+Sysfs entries
+-------------
+
+All Lineage CPL devices report output voltage and device temperature as well as
+alarms for output voltage, temperature, input voltage, input current, input power,
+and fan status.
+
+Input voltage, input current, input power, and fan speed measurement is only
+supported on newer devices. The driver detects if those attributes are supported,
+and only creates respective sysfs entries if they are.
+
+======================= ===============================
+in1_input Output voltage (mV)
+in1_min_alarm Output undervoltage alarm
+in1_max_alarm Output overvoltage alarm
+in1_crit Output voltage critical alarm
+
+in2_input Input voltage (mV, optional)
+in2_alarm Input voltage alarm
+
+curr1_input Input current (mA, optional)
+curr1_alarm Input overcurrent alarm
+
+power1_input Input power (uW, optional)
+power1_alarm Input power alarm
+
+fan1_input Fan 1 speed (rpm, optional)
+fan2_input Fan 2 speed (rpm, optional)
+fan3_input Fan 3 speed (rpm, optional)
+
+temp1_input
+temp1_max
+temp1_crit
+temp1_alarm
+temp1_crit_alarm
+temp1_fault
+======================= ===============================