NAME

     jedec_ts — driver for temperature sensors on memory modules

SYNOPSIS

           device jedec_ts
           device smbus

     Alternatively, to load the driver as a module at boot time, place the following line in
     loader.conf(5):

           jedec_ts_load="YES"

     In /boot/device.hints:

           hint.jedec_ts.0.at="smbus0"
           hint.jedec_ts.0.addr="0x30"
           hint.jedec_ts.1.at="smbus0"
           hint.jedec_ts.1.addr="0x32"
           hint.jedec_ts.2.at="smbus0"
           hint.jedec_ts.2.addr="0x34"
           hint.jedec_ts.3.at="smbus0"
           hint.jedec_ts.3.addr="0x36"
           hint.jedec_ts.4.at="smbus0"
           hint.jedec_ts.4.addr="0x38"
           hint.jedec_ts.5.at="smbus0"
           hint.jedec_ts.5.addr="0x3A"
           hint.jedec_ts.6.at="smbus0"
           hint.jedec_ts.6.addr="0x3C"
           hint.jedec_ts.7.at="smbus0"
           hint.jedec_ts.7.addr="0x3E"

DESCRIPTION

     The jedec_ts driver provides access to sensor data over the smbus(4).  The driver supports
     temperature sensors on memory modules that conform to JEDEC Standard 21-C, TSE2002
     Specification.

     The access to jedec_ts data is made via the sysctl(8) interface:

     dev.jedec_ts.%d.temp  read-only value of the current temperature read by the sensor.

     On a system using device.hints(5), these values are configurable for jedec_ts:

     hint.jedec_ts.%d.at    target smbus(4).

     hint.jedec_ts.%d.addr  jedec_ts SMBus address on the smbus(4).

     jedec_ts temperature sensors can be wired to eight different addresses, allowing up to eight
     sensors on the same smbus(4).

     If the sensors are on an I2C bus behind an iicbus(4) controller, then the iicsmb(4) bridge
     driver can be used to attach the smbus(4).

EXAMPLES

   Sensor read out for two memory modules:
     dev.jedec_ts.0.temp: 40.2500C
     dev.jedec_ts.1.temp: 40.7500C

SEE ALSO

     iicbus(4), iicsmb(4), smbus(4), sysctl(8)

HISTORY

     The jedec_ts driver first appeared in FreeBSD 11.1.

AUTHORS

     The jedec_ts driver and this manual page were written by Andriy Gapon <avg@FreeBSD.org>.