Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
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.