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
  9    Datasheets:
 10	http://www.atmel.com/Images/doc8585.pdf
 11  * IDT TSE2002B3, TSE2002GB2, TS3000B3, TS3000GB2
 12    Datasheets:
 13	http://www.idt.com/sites/default/files/documents/IDT_TSE2002B3C_DST_20100512_120303152056.pdf
 14	http://www.idt.com/sites/default/files/documents/IDT_TSE2002GB2A1_DST_20111107_120303145914.pdf
 15	http://www.idt.com/sites/default/files/documents/IDT_TS3000B3A_DST_20101129_120303152013.pdf
 16	http://www.idt.com/sites/default/files/documents/IDT_TS3000GB2A1_DST_20111104_120303151012.pdf
 17  * Maxim MAX6604
 18    Datasheets:
 19	http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf
 20  * Microchip MCP9804, MCP9805, MCP98242, MCP98243, MCP98244, MCP9843
 21    Datasheets:
 22	http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf
 23	http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf
 24	http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf
 25	http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf
 26	http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf
 27  * NXP Semiconductors SE97, SE97B, SE98, SE98A
 28    Datasheets:
 29	http://www.nxp.com/documents/data_sheet/SE97.pdf
 30	http://www.nxp.com/documents/data_sheet/SE97B.pdf
 31	http://www.nxp.com/documents/data_sheet/SE98.pdf
 32	http://www.nxp.com/documents/data_sheet/SE98A.pdf
 33  * ON Semiconductor CAT34TS02, CAT6095
 34    Datasheet:
 35	http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
 36	http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF
 37  * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS3000
 38    Datasheets:
 39	http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00157556.pdf
 40	http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00157558.pdf
 41	http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00225278.pdf
 42	http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/CD00270920.pdf
 43  * JEDEC JC 42.4 compliant temperature sensor chips
 44    Datasheet:
 45	http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf
 46
 47  Common for all chips:
 48    Prefix: 'jc42'
 49    Addresses scanned: I2C 0x18 - 0x1f
 50
 51Author:
 52	Guenter Roeck <linux@roeck-us.net>
 53
 54
 55Description
 56-----------
 57
 58This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
 59which are used on many DDR3 memory modules for mobile devices and servers. Some
 60systems use the sensor to prevent memory overheating by automatically throttling
 61the memory controller.
 62
 63The driver auto-detects the chips listed above, but can be manually instantiated
 64to support other JC 42.4 compliant chips.
 65
 66Example: the following will load the driver for a generic JC 42.4 compliant
 67temperature sensor at address 0x18 on I2C bus #1:
 68
 69# modprobe jc42
 70# echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
 71
 72A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum,
 73and critical temperature can be configured. There are alarms for high, low,
 74and critical thresholds.
 75
 76There is also an hysteresis to control the thresholds for resetting alarms.
 77Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5,
 783.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those
 79limits. The chip supports only a single register to configure the hysteresis,
 80which applies to all limits. This register can be written by writing into
 81temp1_crit_hyst. Other hysteresis attributes are read-only.
 82
 83If the BIOS has configured the sensor for automatic temperature management, it
 84is likely that it has locked the registers, i.e., that the temperature limits
 85cannot be changed.
 86
 87Sysfs entries
 88-------------
 89
 90temp1_input		Temperature (RO)
 91temp1_min		Minimum temperature (RO or RW)
 92temp1_max		Maximum temperature (RO or RW)
 93temp1_crit		Critical high temperature (RO or RW)
 94
 95temp1_crit_hyst		Critical hysteresis temperature (RO or RW)
 96temp1_max_hyst		Maximum hysteresis temperature (RO)
 97
 98temp1_min_alarm		Temperature low alarm
 99temp1_max_alarm		Temperature high alarm
100temp1_crit_alarm	Temperature critical alarm