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- Kernel driver ads7828
- =====================
- Supported chips:
- * Texas Instruments/Burr-Brown ADS7828
- Prefix: 'ads7828'
- Datasheet: Publicly available at the Texas Instruments website:
- http://focus.ti.com/lit/ds/symlink/ads7828.pdf
- * Texas Instruments ADS7830
- Prefix: 'ads7830'
- Datasheet: Publicly available at the Texas Instruments website:
- http://focus.ti.com/lit/ds/symlink/ads7830.pdf
- Authors:
- Steve Hardy <shardy@redhat.com>
- Vivien Didelot <vivien.didelot@savoirfairelinux.com>
- Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
- 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).
- Description
- -----------
- 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.
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