asem - Man Page

asem -h

asem -a UPS_NAME [OPTIONS]

The asem driver supports the UPS in ASEM PB1300 embedded PCs​. Likely other I2C devices from the same manufacturer will work too, since this is a "custom" charger​.

Seems that there are two versions of the charger​. Older one is based on Max1667, newer one is a custom solution​. Both are on I2C address 0x09​. To be compatible with both versions, the driver just reads bit 15 of address 0x13 which yields online/on battery status​.

Battery monitor is a BQ2060 at address 0x0B​.

The required parameter for this driver is the I2C bus name:

port=dev-node

On the Asem PB1300, this should be /dev/i2c-7 for the i801 SMBUS adapter​.

This driver also supports the following optional settings:

lb=num

Set the low battery threshold to num volts​.

hb=num

Set the high battery threshold to num volts​.

This driver is specific to the Linux I2C API, and requires the libi2c-dev library and headers from lm_sensors project, or its equivalent, to compile​.

Beware that the SystemIO memory used by the I2C controller is reserved by ACPI​. If only a native I2C driver (e​.g​. i2c_i801, as of 3​.5​.X Linux kernels) is available, then you’ll need to relax the ACPI resources check​. For example, you can boot with the acpi_enforce_resources=lax option​.

The driver shutdown function is not implemented, so other arrangements must be made to turn off the UPS​.

Giuseppe Corbelli <giuseppe​.corbelli@copanitalia​.com>

nut(7), nutupsdrv(8), upsd(8).