linux/Documentation/hwmon/max197
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   1Maxim MAX197 driver
   2===================
   3
   4Author:
   5  * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
   6
   7Supported chips:
   8  * Maxim MAX197
   9    Prefix: 'max197'
  10    Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX197.pdf
  11
  12  * Maxim MAX199
  13    Prefix: 'max199'
  14    Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX199.pdf
  15
  16Description
  17-----------
  18
  19The A/D converters MAX197, and MAX199 are both 8-Channel, Multi-Range, 5V,
  2012-Bit DAS with 8+4 Bus Interface and Fault Protection.
  21
  22The available ranges for the MAX197 are {0,-5V} to 5V, and {0,-10V} to 10V,
  23while they are {0,-2V} to 2V, and {0,-4V} to 4V on the MAX199.
  24
  25Platform data
  26-------------
  27
  28The MAX197 platform data (defined in linux/platform_data/max197.h) should be
  29filled with a pointer to a conversion function, defined like:
  30
  31    int convert(u8 ctrl);
  32
  33ctrl is the control byte to write to start a new conversion.
  34On success, the function must return the 12-bit raw value read from the chip,
  35or a negative error code otherwise.
  36
  37Control byte format:
  38
  39Bit     Name       Description
  407,6     PD1,PD0    Clock and Power-Down modes
  415       ACQMOD     Internal or External Controlled Acquisition
  424       RNG        Full-scale voltage magnitude at the input
  433       BIP        Unipolar or Bipolar conversion mode
  442,1,0   A2,A1,A0   Channel
  45
  46Sysfs interface
  47---------------
  48
  49* in[0-7]_input: The conversion value for the corresponding channel.
  50                 RO
  51
  52* in[0-7]_min:   The lower limit (in mV) for the corresponding channel.
  53                 For the MAX197, it will be adjusted to -10000, -5000, or 0.
  54                 For the MAX199, it will be adjusted to -4000, -2000, or 0.
  55                 RW
  56
  57* in[0-7]_max:   The higher limit (in mV) for the corresponding channel.
  58                 For the MAX197, it will be adjusted to 0, 5000, or 10000.
  59                 For the MAX199, it will be adjusted to 0, 2000, or 4000.
  60                 RW
  61
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