1Kernel driver jc42 2================== 3 4Supported 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, TS3000B3, TS3000GB2 15 Datasheets: 16 http://www.idt.com/sites/default/files/documents/IDT_TSE2002B3C_DST_20100512_120303152056.pdf 17 http://www.idt.com/sites/default/files/documents/IDT_TSE2002GB2A1_DST_20111107_120303145914.pdf 18 http://www.idt.com/sites/default/files/documents/IDT_TS3000B3A_DST_20101129_120303152013.pdf 19 http://www.idt.com/sites/default/files/documents/IDT_TS3000GB2A1_DST_20111104_120303151012.pdf 20 * Maxim MAX6604 21 Datasheets: 22 http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf 23 * Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP98244, MCP9843 24 Datasheets: 25 http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf 26 http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf 27 http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf 28 http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf 29 http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf 30 * NXP Semiconductors SE97, SE97B, SE98, SE98A 31 Datasheets: 32 http://www.nxp.com/documents/data_sheet/SE97.pdf 33 http://www.nxp.com/documents/data_sheet/SE97B.pdf 34 http://www.nxp.com/documents/data_sheet/SE98.pdf 35 http://www.nxp.com/documents/data_sheet/SE98A.pdf 36 * ON Semiconductor CAT34TS02, CAT6095 37 Datasheet: 38 http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF 39 http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF 40 * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000 41 Datasheets: 42 http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf 43 http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf 44 http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf 45 http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf 46 http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf 47 * JEDEC JC 42.4 compliant temperature sensor chips 48 Datasheet: 49 http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf 50 51 Common for all chips: 52 Prefix: 'jc42' 53 Addresses scanned: I2C 0x18 - 0x1f 54 55Author: 56 Guenter Roeck <linux@roeck-us.net> 57 58 59Description 60----------- 61 62This driver implements support for JEDEC JC 42.4 compliant temperature sensors, 63which are used on many DDR3 memory modules for mobile devices and servers. Some 64systems use the sensor to prevent memory overheating by automatically throttling 65the memory controller. 66 67The driver auto-detects the chips listed above, but can be manually instantiated 68to support other JC 42.4 compliant chips. 69 70Example: the following will load the driver for a generic JC 42.4 compliant 71temperature sensor at address 0x18 on I2C bus #1: 72 73# modprobe jc42 74# echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device 75 76A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum, 77and critical temperature can be configured. There are alarms for high, low, 78and critical thresholds. 79 80There is also an hysteresis to control the thresholds for resetting alarms. 81Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5, 823.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those 83limits. The chip supports only a single register to configure the hysteresis, 84which applies to all limits. This register can be written by writing into 85temp1_crit_hyst. Other hysteresis attributes are read-only. 86 87If the BIOS has configured the sensor for automatic temperature management, it 88is likely that it has locked the registers, i.e., that the temperature limits 89cannot be changed. 90 91Sysfs entries 92------------- 93 94temp1_input Temperature (RO) 95temp1_min Minimum temperature (RO or RW) 96temp1_max Maximum temperature (RO or RW) 97temp1_crit Critical high temperature (RO or RW) 98 99temp1_crit_hyst Critical hysteresis temperature (RO or RW) 100temp1_max_hyst Maximum hysteresis temperature (RO) 101 102temp1_min_alarm Temperature low alarm 103temp1_max_alarm Temperature high alarm 104temp1_crit_alarm Temperature critical alarm 105