Kernel driver ads7828

Supported chips:


Platform data

The ads7828 driver accepts an optional ads7828_platform_data structure (defined in include/linux/platform_data/ads7828.h). The structure fields are:

  • diff_input: (bool) Differential operation

    set to true for differential mode, false for default single ended mode.

  • ext_vref: (bool) External reference

    set to true if it operates with an external reference, false for default internal reference.

  • vref_mv: (unsigned int) Voltage reference

    if using an external reference, set this to the reference voltage in mV, otherwise it will default to the internal value (2500mV). This value will be bounded with limits accepted by the chip, described in the datasheet.

If no structure is provided, the configuration defaults to single ended operation and internal voltage reference (2.5V).


This driver implements support for the Texas Instruments ADS7828 and ADS7830.

The ADS7828 device is a 12-bit 8-channel A/D converter, while the ADS7830 does 8-bit sampling.

It can operate in single ended mode (8 +ve inputs) or in differential mode, where 4 differential pairs can be measured.

The chip also has the facility to use an external voltage reference. This may be required if your hardware supplies the ADS7828 from a 5V supply, see the datasheet for more details.

There is no reliable way to identify this chip, so the driver will not scan some addresses to try to auto-detect it. That means that you will have to statically declare the device in the platform support code.