| | 1 | Kernel driver ads7828 |
| | 2 | ===================== |
| | 3 | |
| | 4 | Supported chips: |
| | 5 | * Texas Instruments/Burr-Brown ADS7828 |
| | 6 | Prefix: 'ads7828' |
| | 7 | Datasheet: Publicly available at the Texas Instruments website: |
| | 8 | http://focus.ti.com/lit/ds/symlink/ads7828.pdf |
| | 9 | |
| | 10 | * Texas Instruments ADS7830 |
| | 11 | Prefix: 'ads7830' |
| | 12 | Datasheet: Publicly available at the Texas Instruments website: |
| | 13 | http://focus.ti.com/lit/ds/symlink/ads7830.pdf |
| | 14 | |
| | 15 | Authors: |
| | 16 | Steve Hardy <shardy@redhat.com> |
| | 17 | Vivien Didelot <vivien.didelot@savoirfairelinux.com> |
| | 18 | Guillaume Roguez <guillaume.roguez@savoirfairelinux.com> |
| | 19 | |
| | 20 | Platform data |
| | 21 | ------------- |
| | 22 | |
| | 23 | The ads7828 driver accepts an optional ads7828_platform_data structure (defined |
| | 24 | in include/linux/platform_data/ads7828.h). The structure fields are: |
| | 25 | |
| | 26 | * diff_input: (bool) Differential operation |
| | 27 | set to true for differential mode, false for default single ended mode. |
| | 28 | |
| | 29 | * ext_vref: (bool) External reference |
| | 30 | set to true if it operates with an external reference, false for default |
| | 31 | internal reference. |
| | 32 | |
| | 33 | * vref_mv: (unsigned int) Voltage reference |
| | 34 | if using an external reference, set this to the reference voltage in mV, |
| | 35 | otherwise it will default to the internal value (2500mV). This value will be |
| | 36 | bounded with limits accepted by the chip, described in the datasheet. |
| | 37 | |
| | 38 | If no structure is provided, the configuration defaults to single ended |
| | 39 | operation and internal voltage reference (2.5V). |
| | 40 | |
| | 41 | Description |
| | 42 | ----------- |
| | 43 | |
| | 44 | This driver implements support for the Texas Instruments ADS7828 and ADS7830. |
| | 45 | |
| | 46 | The ADS7828 device is a 12-bit 8-channel A/D converter, while the ADS7830 does |
| | 47 | 8-bit sampling. |
| | 48 | |
| | 49 | It can operate in single ended mode (8 +ve inputs) or in differential mode, |
| | 50 | where 4 differential pairs can be measured. |
| | 51 | |
| | 52 | The chip also has the facility to use an external voltage reference. This |
| | 53 | may be required if your hardware supplies the ADS7828 from a 5V supply, see |
| | 54 | the datasheet for more details. |
| | 55 | |
| | 56 | There is no reliable way to identify this chip, so the driver will not scan |
| | 57 | some addresses to try to auto-detect it. That means that you will have to |
| | 58 | statically declare the device in the platform support code. |
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