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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
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