1Kernel driver ads7828
2=====================
3
4Supported chips:
5
6  * Texas Instruments/Burr-Brown ADS7828
7
8    Prefix: 'ads7828'
9
10    Datasheet: Publicly available at the Texas Instruments website:
11
12	       http://focus.ti.com/lit/ds/symlink/ads7828.pdf
13
14  * Texas Instruments ADS7830
15
16    Prefix: 'ads7830'
17
18    Datasheet: Publicly available at the Texas Instruments website:
19
20	       http://focus.ti.com/lit/ds/symlink/ads7830.pdf
21
22Authors:
23	- Steve Hardy <shardy@redhat.com>
24	- Vivien Didelot <vivien.didelot@savoirfairelinux.com>
25	- Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
26
27Platform data
28-------------
29
30The ads7828 driver accepts an optional ads7828_platform_data structure (defined
31in include/linux/platform_data/ads7828.h). The structure fields are:
32
33* diff_input: (bool) Differential operation
34    set to true for differential mode, false for default single ended mode.
35
36* ext_vref: (bool) External reference
37    set to true if it operates with an external reference, false for default
38    internal reference.
39
40* vref_mv: (unsigned int) Voltage reference
41    if using an external reference, set this to the reference voltage in mV,
42    otherwise it will default to the internal value (2500mV). This value will be
43    bounded with limits accepted by the chip, described in the datasheet.
44
45 If no structure is provided, the configuration defaults to single ended
46 operation and internal voltage reference (2.5V).
47
48Description
49-----------
50
51This driver implements support for the Texas Instruments ADS7828 and ADS7830.
52
53The ADS7828 device is a 12-bit 8-channel A/D converter, while the ADS7830 does
548-bit sampling.
55
56It can operate in single ended mode (8 +ve inputs) or in differential mode,
57where 4 differential pairs can be measured.
58
59The chip also has the facility to use an external voltage reference.  This
60may be required if your hardware supplies the ADS7828 from a 5V supply, see
61the datasheet for more details.
62
63There is no reliable way to identify this chip, so the driver will not scan
64some addresses to try to auto-detect it. That means that you will have to
65statically declare the device in the platform support code.
66