Kernel driver jc42
  ==================
  
  Supported chips:
    * Analog Devices ADT7408

      Datasheets:
  	http://www.analog.com/static/imported-files/data_sheets/ADT7408.pdf

    * Atmel AT30TS00, AT30TS002A/B, AT30TSE004A

      Datasheets:

  	http://www.atmel.com/Images/doc8585.pdf

  	http://www.atmel.com/Images/doc8711.pdf
  	http://www.atmel.com/Images/Atmel-8852-SEEPROM-AT30TSE002A-Datasheet.pdf
  	http://www.atmel.com/Images/Atmel-8868-DTS-AT30TSE004A-Datasheet.pdf

    * IDT TSE2002B3, TSE2002GB2, TSE2004GB2, TS3000B3, TS3000GB0, TS3000GB2,
  	TS3001GB2

      Datasheets:

  	Available from IDT web site

    * Maxim MAX6604

      Datasheets:
  	http://datasheets.maxim-ic.com/en/ds/MAX6604.pdf

    * Microchip MCP9804, MCP9805, MCP9808, MCP98242, MCP98243, MCP98244, MCP9843

      Datasheets:

  	http://ww1.microchip.com/downloads/en/DeviceDoc/22203C.pdf

  	http://ww1.microchip.com/downloads/en/DeviceDoc/21977b.pdf

  	http://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdf

  	http://ww1.microchip.com/downloads/en/DeviceDoc/21996a.pdf
  	http://ww1.microchip.com/downloads/en/DeviceDoc/22153c.pdf

  	http://ww1.microchip.com/downloads/en/DeviceDoc/22327A.pdf

    * NXP Semiconductors SE97, SE97B, SE98, SE98A

      Datasheets:
  	http://www.nxp.com/documents/data_sheet/SE97.pdf
  	http://www.nxp.com/documents/data_sheet/SE97B.pdf

  	http://www.nxp.com/documents/data_sheet/SE98.pdf

  	http://www.nxp.com/documents/data_sheet/SE98A.pdf

    * ON Semiconductor CAT34TS02, CAT6095

      Datasheet:
  	http://www.onsemi.com/pub_link/Collateral/CAT34TS02-D.PDF
  	http://www.onsemi.com/pub/Collateral/CAT6095-D.PDF

    * ST Microelectronics STTS424, STTS424E02, STTS2002, STTS2004, STTS3000

      Datasheets:

  	http://www.st.com/web/en/resource/technical/document/datasheet/CD00157556.pdf
  	http://www.st.com/web/en/resource/technical/document/datasheet/CD00157558.pdf
  	http://www.st.com/web/en/resource/technical/document/datasheet/CD00266638.pdf
  	http://www.st.com/web/en/resource/technical/document/datasheet/CD00225278.pdf
  	http://www.st.com/web/en/resource/technical/document/datasheet/DM00076709.pdf

    * JEDEC JC 42.4 compliant temperature sensor chips

      Datasheet:
  	http://www.jedec.org/sites/default/files/docs/4_01_04R19.pdf

    Common for all chips:
      Prefix: 'jc42'
      Addresses scanned: I2C 0x18 - 0x1f

  Author:

  	Guenter Roeck <linux@roeck-us.net>

  
  
  Description
  -----------

  This driver implements support for JEDEC JC 42.4 compliant temperature sensors,
  which are used on many DDR3 memory modules for mobile devices and servers. Some
  systems use the sensor to prevent memory overheating by automatically throttling
  the memory controller.

  The driver auto-detects the chips listed above, but can be manually instantiated
  to support other JC 42.4 compliant chips.
  
  Example: the following will load the driver for a generic JC 42.4 compliant
  temperature sensor at address 0x18 on I2C bus #1:
  
  # modprobe jc42
  # echo jc42 0x18 > /sys/bus/i2c/devices/i2c-1/new_device
  
  A JC 42.4 compliant chip supports a single temperature sensor. Minimum, maximum,
  and critical temperature can be configured. There are alarms for high, low,
  and critical thresholds.
  
  There is also an hysteresis to control the thresholds for resetting alarms.
  Per JC 42.4 specification, the hysteresis threshold can be configured to 0, 1.5,
  3.0, and 6.0 degrees C. Configured hysteresis values will be rounded to those
  limits. The chip supports only a single register to configure the hysteresis,
  which applies to all limits. This register can be written by writing into
  temp1_crit_hyst. Other hysteresis attributes are read-only.

  If the BIOS has configured the sensor for automatic temperature management, it
  is likely that it has locked the registers, i.e., that the temperature limits
  cannot be changed.

  Sysfs entries
  -------------
  
  temp1_input		Temperature (RO)

  temp1_min		Minimum temperature (RO or RW)
  temp1_max		Maximum temperature (RO or RW)
  temp1_crit		Critical high temperature (RO or RW)

  temp1_crit_hyst		Critical hysteresis temperature (RO or RW)

  temp1_max_hyst		Maximum hysteresis temperature (RO)
  
  temp1_min_alarm		Temperature low alarm
  temp1_max_alarm		Temperature high alarm
  temp1_crit_alarm	Temperature critical alarm