Description¶

This driver supports various Lineage Compact Power Line DC/DC and AC/DCconverters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others.

Lineage CPL power entry modules are nominally PMBus compliant. However, moststandard PMBus commands are not supported. Specifically, all hardware monitoringand status reporting commands are non-standard. For this reason, a standardPMBus driver can not be used.

Usage Notes¶

This driver does not probe for Lineage CPL devices, since there is no registerwhich can be safely used to identify the chip. You will have to instantiatethe devices explicitly.

Example: the following will load the driver for a Lineage PEM at address 0x40on 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 clientdriver to the pca9541 I2C master selector driver.

Sysfs entries¶

All Lineage CPL devices report output voltage and device temperature as well asalarms for output voltage, temperature, input voltage, input current, input power,and fan status.

Input voltage, input current, input power, and fan speed measurement is onlysupported on newer devices. The driver detects if those attributes are supported,and only creates respective sysfs entries if they are.