Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver jc42 2 ================== 3 4 Supported chips: 5 * Analog Devices ADT7408 6 Datasheets: 7 http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf 8 * Atmel AT30TS00, AT30TS002A/B, AT30TSE004A 9 Datasheets: 10 http://www.atmel.com/Images/doc8585.pdf 11 http://www.atmel.com/Images/doc8711.pdf 12 http://www.atmel.com/Images/Atmel-8852-SEEPROM-AT30TSE002A-Datasheet.pdf 13 http://www.atmel.com/Images/Atmel-8868-DTS-AT30TSE004A-Datasheet.pdf 14 * IDT TSE2002B3, TSE2002GB2, TSE2004GB2, TS3000B3, TS3000GB0, TS3000GB2, 15 TS3001GB2 16 Datasheets: 17 Available from IDT web site 18 * Maxim MAX6604 19 Datasheets: 20 http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf 21 * Microchip MCP9804, MCP9805, MCP9808, MCP98242, MCP98243, MCP98244, MCP9843 22 Datasheets: 23 http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf 24 http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf 25 http://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdf 26 http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf 27 http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf 28 http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf 29 * NXP Semiconductors SE97, SE97B, SE98, SE98A 30 Datasheets: 31 http://www.nxp.com/documents/data_sheet/SE97.pdf 32 http://www.nxp.com/documents/data_sheet/SE97B.pdf 33 http://www.nxp.com/documents/data_sheet/SE98.pdf 34 http://www.nxp.com/documents/data_sheet/SE98A.pdf 35 * ON Semiconductor CAT34TS02, CAT6095 36 Datasheet: 37 http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF 38 http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF 39 * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000 40 Datasheets: 41 http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf 42 http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf 43 http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf 44 http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf 45 http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf 46 * JEDEC JC 42.4 compliant temperature sensor chips 47 Datasheet: 48 http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf 49 50 Common for all chips: 51 Prefix: 'jc42' 52 Addresses scanned: I2C 0x18 - 0x1f 53 54 Author: 55 Guenter Roeck <linux@roeck-us.net> 56 57 58 Description 59 ----------- 60 61 This driver implements support for JEDEC JC 42.4 compliant temperature sensors, 62 which are used on many DDR3 memory modules for mobile devices and servers. Some 63 systems use the sensor to prevent memory overheating by automatically throttling 64 the memory controller. 65 66 The driver auto-detects the chips listed above, but can be manually instantiated 67 to support other JC 42.4 compliant chips. 68 69 Example: the following will load the driver for a generic JC 42.4 compliant 70 temperature sensor at address 0x18 on I2C bus #1: 71 72 # modprobe jc42 73 # echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device 74 75 A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum, 76 and critical temperature can be configured. There are alarms for high, low, 77 and critical thresholds. 78 79 There is also an hysteresis to control the thresholds for resetting alarms. 80 Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5, 81 3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those 82 limits. The chip supports only a single register to configure the hysteresis, 83 which applies to all limits. This register can be written by writing into 84 temp1_crit_hyst. Other hysteresis attributes are read-only. 85 86 If the BIOS has configured the sensor for automatic temperature management, it 87 is likely that it has locked the registers, i.e., that the temperature limits 88 cannot be changed. 89 90 Sysfs entries 91 ------------- 92 93 temp1_input Temperature (RO) 94 temp1_min Minimum temperature (RO or RW) 95 temp1_max Maximum temperature (RO or RW) 96 temp1_crit Critical high temperature (RO or RW) 97 98 temp1_crit_hyst Critical hysteresis temperature (RO or RW) 99 temp1_max_hyst Maximum hysteresis temperature (RO) 100 101 temp1_min_alarm Temperature low alarm 102 temp1_max_alarm Temperature high alarm 103 temp1_crit_alarm Temperature critical alarm