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-Maxim MAX197 driver
-===================
-
-Author:
- * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
-
-Supported chips:
- * Maxim MAX197
- Prefix: 'max197'
- Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX197.pdf
-
- * Maxim MAX199
- Prefix: 'max199'
- Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX199.pdf
-
-Description
------------
-
-The A/D converters MAX197, and MAX199 are both 8-Channel, Multi-Range, 5V,
-12-Bit DAS with 8+4 Bus Interface and Fault Protection.
-
-The available ranges for the MAX197 are {0,-5V} to 5V, and {0,-10V} to 10V,
-while they are {0,-2V} to 2V, and {0,-4V} to 4V on the MAX199.
-
-Platform data
--------------
-
-The MAX197 platform data (defined in linux/platform_data/max197.h) should be
-filled with a pointer to a conversion function, defined like:
-
- int convert(u8 ctrl);
-
-ctrl is the control byte to write to start a new conversion.
-On success, the function must return the 12-bit raw value read from the chip,
-or a negative error code otherwise.
-
-Control byte format:
-
-Bit Name Description
-7,6 PD1,PD0 Clock and Power-Down modes
-5 ACQMOD Internal or External Controlled Acquisition
-4 RNG Full-scale voltage magnitude at the input
-3 BIP Unipolar or Bipolar conversion mode
-2,1,0 A2,A1,A0 Channel
-
-Sysfs interface
----------------
-
-* in[0-7]_input: The conversion value for the corresponding channel.
- RO
-
-* in[0-7]_min: The lower limit (in mV) for the corresponding channel.
- For the MAX197, it will be adjusted to -10000, -5000, or 0.
- For the MAX199, it will be adjusted to -4000, -2000, or 0.
- RW
-
-* in[0-7]_max: The higher limit (in mV) for the corresponding channel.
- For the MAX197, it will be adjusted to 0, 5000, or 10000.
- For the MAX199, it will be adjusted to 0, 2000, or 4000.
- RW