| 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 |
