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- Kernel driver jc42
- ==================
- Supported chips:
- * Analog Devices ADT7408
- Datasheets:
- http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf
- * Atmel AT30TS00
- Datasheets:
- http://www.atmel.com/Images/doc8585.pdf
- * IDT TSE2002B3, TSE2002GB2, TS3000B3, TS3000GB2
- Datasheets:
- http://www.idt.com/sites/default/files/documents/IDT_TSE2002B3C_DST_20100512_120303152056.pdf
- http://www.idt.com/sites/default/files/documents/IDT_TSE2002GB2A1_DST_20111107_120303145914.pdf
- http://www.idt.com/sites/default/files/documents/IDT_TS3000B3A_DST_20101129_120303152013.pdf
- http://www.idt.com/sites/default/files/documents/IDT_TS3000GB2A1_DST_20111104_120303151012.pdf
- * Maxim MAX6604
- Datasheets:
- http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf
- * Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP9843
- Datasheets:
- http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf
- http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf
- http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf
- http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf
- * NXP Semiconductors SE97, SE97B, SE98, SE98A
- Datasheets:
- http://www.nxp.com/documents/data_sheet/SE97.pdf
- http://www.nxp.com/documents/data_sheet/SE97B.pdf
- http://www.nxp.com/documents/data_sheet/SE98.pdf
- http://www.nxp.com/documents/data_sheet/SE98A.pdf
- * ON Semiconductor CAT34TS02, CAT6095
- Datasheet:
- http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
- http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF
- * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS3000
- Datasheets:
- http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00157556.pdf
- http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00157558.pdf
- http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00225278.pdf
- http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/CD00270920.pdf
- * JEDEC JC 42.4 compliant temperature sensor chips
- Datasheet:
- http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf
- Common for all chips:
- Prefix: 'jc42'
- Addresses scanned: I2C 0x18 - 0x1f
- Author:
- Guenter Roeck <guenter.roeck@ericsson.com>
- Description
- -----------
- This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
- which are used on many DDR3 memory modules for mobile devices and servers. Some
- systems use the sensor to prevent memory overheating by automatically throttling
- the memory controller.
- The driver auto-detects the chips listed above, but can be manually instantiated
- to support other JC 42.4 compliant chips.
- Example: the following will load the driver for a generic JC 42.4 compliant
- temperature sensor at address 0x18 on I2C bus #1:
- # modprobe jc42
- # echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
- A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum,
- and critical temperature can be configured. There are alarms for high, low,
- and critical thresholds.
- There is also an hysteresis to control the thresholds for resetting alarms.
- Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5,
- 3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those
- limits. The chip supports only a single register to configure the hysteresis,
- which applies to all limits. This register can be written by writing into
- temp1_crit_hyst. Other hysteresis attributes are read-only.
- If the BIOS has configured the sensor for automatic temperature management, it
- is likely that it has locked the registers, i.e., that the temperature limits
- cannot be changed.
- Sysfs entries
- -------------
- temp1_input Temperature (RO)
- temp1_min Minimum temperature (RO or RW)
- temp1_max Maximum temperature (RO or RW)
- temp1_crit Critical high temperature (RO or RW)
- temp1_crit_hyst Critical hysteresis temperature (RO or RW)
- temp1_max_hyst Maximum hysteresis temperature (RO)
- temp1_min_alarm Temperature low alarm
- temp1_max_alarm Temperature high alarm
- temp1_crit_alarm Temperature critical alarm
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