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diff --git a/Documentation/hwmon/ads7828.rst b/Documentation/hwmon/ads7828.rst new file mode 100644 index 000000000..b830b490c --- /dev/null +++ b/Documentation/hwmon/ads7828.rst @@ -0,0 +1,65 @@ +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. |