1Kernel driver jc42 2================== 3 4Supported chips: 5 * Analog Devices ADT7408 6 Prefix: 'adt7408' 7 Addresses scanned: I2C 0x18 - 0x1f 8 Datasheets: 9 http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf 10 * Atmel AT30TS00 11 Prefix: 'at30ts00' 12 Addresses scanned: I2C 0x18 - 0x1f 13 Datasheets: 14 http://www.atmel.com/Images/doc8585.pdf 15 * IDT TSE2002B3, TSE2002GB2, TS3000B3, TS3000GB2 16 Prefix: 'tse2002', 'ts3000' 17 Addresses scanned: I2C 0x18 - 0x1f 18 Datasheets: 19 http://www.idt.com/sites/default/files/documents/IDT_TSE2002B3C_DST_20100512_120303152056.pdf 20 http://www.idt.com/sites/default/files/documents/IDT_TSE2002GB2A1_DST_20111107_120303145914.pdf 21 http://www.idt.com/sites/default/files/documents/IDT_TS3000B3A_DST_20101129_120303152013.pdf 22 http://www.idt.com/sites/default/files/documents/IDT_TS3000GB2A1_DST_20111104_120303151012.pdf 23 * Maxim MAX6604 24 Prefix: 'max6604' 25 Addresses scanned: I2C 0x18 - 0x1f 26 Datasheets: 27 http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf 28 * Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP9843 29 Prefixes: 'mcp9804', 'mcp9805', 'mcp98242', 'mcp98243', 'mcp9843' 30 Addresses scanned: I2C 0x18 - 0x1f 31 Datasheets: 32 http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf 33 http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf 34 http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf 35 http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf 36 * NXP Semiconductors SE97, SE97B 37 Prefix: 'se97' 38 Addresses scanned: I2C 0x18 - 0x1f 39 Datasheets: 40 http://www.nxp.com/documents/data_sheet/SE97.pdf 41 http://www.nxp.com/documents/data_sheet/SE97B.pdf 42 * NXP Semiconductors SE98 43 Prefix: 'se98' 44 Addresses scanned: I2C 0x18 - 0x1f 45 Datasheets: 46 http://www.nxp.com/documents/data_sheet/SE98.pdf 47 * ON Semiconductor CAT34TS02, CAT6095 48 Prefix: 'cat34ts02', 'cat6095' 49 Addresses scanned: I2C 0x18 - 0x1f 50 Datasheet: 51 http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF 52 http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF 53 * ST Microelectronics STTS424, STTS424E02 54 Prefix: 'stts424' 55 Addresses scanned: I2C 0x18 - 0x1f 56 Datasheets: 57 http://www.st.com/stonline/products/literature/ds/13447/stts424.pdf 58 http://www.st.com/stonline/products/literature/ds/13448/stts424e02.pdf 59 * ST Microelectronics STTS2002, STTS3000 60 Prefix: 'stts2002', 'stts3000' 61 Addresses scanned: I2C 0x18 - 0x1f 62 Datasheets: 63 http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00225278.pdf 64 http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/CD00270920.pdf 65 * JEDEC JC 42.4 compliant temperature sensor chips 66 Prefix: 'jc42' 67 Addresses scanned: I2C 0x18 - 0x1f 68 Datasheet: 69 http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf 70 71Author: 72 Guenter Roeck <guenter.roeck@ericsson.com> 73 74 75Description 76----------- 77 78This driver implements support for JEDEC JC 42.4 compliant temperature sensors, 79which are used on many DDR3 memory modules for mobile devices and servers. Some 80systems use the sensor to prevent memory overheating by automatically throttling 81the memory controller. 82 83The driver auto-detects the chips listed above, but can be manually instantiated 84to support other JC 42.4 compliant chips. 85 86Example: the following will load the driver for a generic JC 42.4 compliant 87temperature sensor at address 0x18 on I2C bus #1: 88 89# modprobe jc42 90# echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device 91 92A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum, 93and critical temperature can be configured. There are alarms for high, low, 94and critical thresholds. 95 96There is also an hysteresis to control the thresholds for resetting alarms. 97Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5, 983.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those 99limits. The chip supports only a single register to configure the hysteresis, 100which applies to all limits. This register can be written by writing into 101temp1_crit_hyst. Other hysteresis attributes are read-only. 102 103If the BIOS has configured the sensor for automatic temperature management, it 104is likely that it has locked the registers, i.e., that the temperature limits 105cannot be changed. 106 107Sysfs entries 108------------- 109 110temp1_input Temperature (RO) 111temp1_min Minimum temperature (RO or RW) 112temp1_max Maximum temperature (RO or RW) 113temp1_crit Critical high temperature (RO or RW) 114 115temp1_crit_hyst Critical hysteresis temperature (RO or RW) 116temp1_max_hyst Maximum hysteresis temperature (RO) 117 118temp1_min_alarm Temperature low alarm 119temp1_max_alarm Temperature high alarm 120temp1_crit_alarm Temperature critical alarm 121