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, 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, 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/21996a.pdf
 26	http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf
 27	http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf
 28  * NXP Semiconductors SE97, SE97B, SE98, SE98A
 29    Datasheets:
 30	http://www.nxp.com/documents/data_sheet/SE97.pdf
 31	http://www.nxp.com/documents/data_sheet/SE97B.pdf
 32	http://www.nxp.com/documents/data_sheet/SE98.pdf
 33	http://www.nxp.com/documents/data_sheet/SE98A.pdf
 34  * ON Semiconductor CAT34TS02, CAT6095
 35    Datasheet:
 36	http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
 37	http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF
 38  * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000
 39    Datasheets:
 40	http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf
 41	http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf
 42	http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf
 43	http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf
 44	http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf
 45  * JEDEC JC 42.4 compliant temperature sensor chips
 46    Datasheet:
 47	http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf
 48
 49  Common for all chips:
 50    Prefix: 'jc42'
 51    Addresses scanned: I2C 0x18 - 0x1f
 52
 53Author:
 54	Guenter Roeck <linux@roeck-us.net>
 55
 56
 57Description
 58-----------
 59
 60This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
 61which are used on many DDR3 memory modules for mobile devices and servers. Some
 62systems use the sensor to prevent memory overheating by automatically throttling
 63the memory controller.
 64
 65The driver auto-detects the chips listed above, but can be manually instantiated
 66to support other JC 42.4 compliant chips.
 67
 68Example: the following will load the driver for a generic JC 42.4 compliant
 69temperature sensor at address 0x18 on I2C bus #1:
 70
 71# modprobe jc42
 72# echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
 73
 74A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum,
 75and critical temperature can be configured. There are alarms for high, low,
 76and critical thresholds.
 77
 78There is also an hysteresis to control the thresholds for resetting alarms.
 79Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5,
 803.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those
 81limits. The chip supports only a single register to configure the hysteresis,
 82which applies to all limits. This register can be written by writing into
 83temp1_crit_hyst. Other hysteresis attributes are read-only.
 84
 85If the BIOS has configured the sensor for automatic temperature management, it
 86is likely that it has locked the registers, i.e., that the temperature limits
 87cannot be changed.
 88
 89Sysfs entries
 90-------------
 91
 92temp1_input		Temperature (RO)
 93temp1_min		Minimum temperature (RO or RW)
 94temp1_max		Maximum temperature (RO or RW)
 95temp1_crit		Critical high temperature (RO or RW)
 96
 97temp1_crit_hyst		Critical hysteresis temperature (RO or RW)
 98temp1_max_hyst		Maximum hysteresis temperature (RO)
 99
100temp1_min_alarm		Temperature low alarm
101temp1_max_alarm		Temperature high alarm
102temp1_crit_alarm	Temperature critical alarm