Kernel driver ntc_thermistor
  =================

  Supported thermistors from Murata:

  * Murata NTC Thermistors NCP15WB473, NCP18WB473, NCP21WB473, NCP03WB473,

    NCP15WL333, NCP03WF104, NCP15XH103

    Prefixes: 'ncp15wb473', 'ncp18wb473', 'ncp21wb473', 'ncp03wb473',

    'ncp15wl333', 'ncp03wf104', 'ncp15xh103'

    Datasheet: Publicly available at Murata

  Supported thermistors from EPCOS:
  * EPCOS NTC Thermistors B57330V2103
    Prefixes: b57330v2103
    Datasheet: Publicly available at EPCOS

  Other NTC thermistors can be supported simply by adding compensation
  tables; e.g., NCP15WL333 support is added by the table ncpXXwl333.
  
  Authors:
  	MyungJoo Ham <myungjoo.ham@samsung.com>
  
  Description
  -----------

  The NTC (Negative Temperature Coefficient) thermistor is a simple thermistor
  that requires users to provide the resistance and lookup the corresponding
  compensation table to get the temperature input.

  
  The NTC driver provides lookup tables with a linear approximation function
  and four circuit models with an option not to use any of the four models.
  
  The four circuit models provided are:
  
  	$: resister, [TH]: the thermistor
  
   1. connect = NTC_CONNECTED_POSITIVE, pullup_ohm > 0
  
     [pullup_uV]
         |    |
        [TH]  $ (pullup_ohm)
         |    |
         +----+-----------------------[read_uV]
         |
         $ (pulldown_ohm)
         |
        --- (ground)
  
   2. connect = NTC_CONNECTED_POSITIVE, pullup_ohm = 0 (not-connected)
  
     [pullup_uV]
         |
        [TH]
         |
         +----------------------------[read_uV]
         |
         $ (pulldown_ohm)
         |
        --- (ground)
  
   3. connect = NTC_CONNECTED_GROUND, pulldown_ohm > 0
  
     [pullup_uV]
         |
         $ (pullup_ohm)
         |
         +----+-----------------------[read_uV]
         |    |
        [TH]  $ (pulldown_ohm)
         |    |
        -------- (ground)
  
   4. connect = NTC_CONNECTED_GROUND, pulldown_ohm = 0 (not-connected)
  
     [pullup_uV]
         |
         $ (pullup_ohm)
         |
         +----------------------------[read_uV]
         |
        [TH]
         |
        --- (ground)
  
  When one of the four circuit models is used, read_uV, pullup_uV, pullup_ohm,
  pulldown_ohm, and connect should be provided. When none of the four models
  are suitable or the user can get the resistance directly, the user should
  provide read_ohm and _not_ provide the others.
  
  Sysfs Interface
  ---------------
  name		the mandatory global attribute, the thermistor name.
  
  temp1_type	always 4 (thermistor)
  		RO
  
  temp1_input	measure the temperature and provide the measured value.
  		(reading this file initiates the reading procedure.)
  		RO
  
  Note that each NTC thermistor has only _one_ thermistor; thus, only temp1 exists.