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- Kernel driver jc42
- ==================
- Supported chips:
- * Analog Devices ADT7408
- Prefix: 'adt7408'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheets:
- http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf
- * IDT TSE2002B3, TS3000B3
- Prefix: 'tse2002b3', 'ts3000b3'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheets:
- http://www.idt.com/products/getdoc.cfm?docid=18715691
- http://www.idt.com/products/getdoc.cfm?docid=18715692
- * Maxim MAX6604
- Prefix: 'max6604'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheets:
- http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf
- * Microchip MCP9805, MCP98242, MCP98243, MCP9843
- Prefixes: 'mcp9805', 'mcp98242', 'mcp98243', 'mcp9843'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheets:
- 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
- Prefix: 'se97'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheets:
- http://www.nxp.com/documents/data_sheet/SE97.pdf
- http://www.nxp.com/documents/data_sheet/SE97B.pdf
- * NXP Semiconductors SE98
- Prefix: 'se98'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheets:
- http://www.nxp.com/documents/data_sheet/SE98.pdf
- * ON Semiconductor CAT34TS02, CAT6095
- Prefix: 'cat34ts02', 'cat6095'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheet:
- http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
- http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF
- * ST Microelectronics STTS424, STTS424E02
- Prefix: 'stts424'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheets:
- http://www.st.com/stonline/products/literature/ds/13447/stts424.pdf
- http://www.st.com/stonline/products/literature/ds/13448/stts424e02.pdf
- * JEDEC JC 42.4 compliant temperature sensor chips
- Prefix: 'jc42'
- Addresses scanned: I2C 0x18 - 0x1f
- Datasheet: -
- Author:
- Guenter Roeck <guenter.roeck@ericsson.com>
- Description
- -----------
- This driver implements support for JEDEC JC 42.4 compliant temperature sensors.
- 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.
- Sysfs entries
- -------------
- temp1_input Temperature (RO)
- temp1_min Minimum temperature (RW)
- temp1_max Maximum temperature (RW)
- temp1_crit Critical high temperature (RW)
- temp1_crit_hyst Critical hysteresis temperature (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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