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46d7846292
As there is no reliable way to identify the chip, it is preferable to remove the detect callback, to avoid misdetection. Module parameters are not worth it here, so let's get rid of them and add an ads7828_platform_data structure instead. Clean the code by removing unused macros, fixing coding style issues, avoiding function prototypes and using convenient macros such as module_i2c_driver(). Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
52 lines
1.8 KiB
Plaintext
52 lines
1.8 KiB
Plaintext
Kernel driver ads7828
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=====================
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Supported chips:
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* Texas Instruments/Burr-Brown ADS7828
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Prefix: 'ads7828'
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Datasheet: Publicly available at the Texas Instruments website:
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http://focus.ti.com/lit/ds/symlink/ads7828.pdf
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Authors:
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Steve Hardy <shardy@redhat.com>
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Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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Platform data
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-------------
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The ads7828 driver accepts an optional ads7828_platform_data structure (defined
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in include/linux/platform_data/ads7828.h). The structure fields are:
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* diff_input: (bool) Differential operation
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set to true for differential mode, false for default single ended mode.
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* ext_vref: (bool) External reference
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set to true if it operates with an external reference, false for default
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internal reference.
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* vref_mv: (unsigned int) Voltage reference
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if using an external reference, set this to the reference voltage in mV,
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otherwise it will default to the internal value (2500mV). This value will be
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bounded with limits accepted by the chip, described in the datasheet.
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If no structure is provided, the configuration defaults to single ended
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operation and internal voltage reference (2.5V).
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Description
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-----------
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This driver implements support for the Texas Instruments ADS7828.
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This device is a 12-bit 8-channel A-D converter.
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It can operate in single ended mode (8 +ve inputs) or in differential mode,
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where 4 differential pairs can be measured.
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The chip also has the facility to use an external voltage reference. This
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may be required if your hardware supplies the ADS7828 from a 5V supply, see
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the datasheet for more details.
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There is no reliable way to identify this chip, so the driver will not scan
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some addresses to try to auto-detect it. That means that you will have to
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statically declare the device in the platform support code.
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