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 lm_sensors libi2c-dev 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>

nutupsdrv(8), upsd(8).