IIO: ADC: New driver for AD7792/AD7793 3 Channel SPI ADC
New driver for AD7792/AD7793 3-Channel, Low Noise, Low Power, 16-/24-Bit Sigma-Delta ADC with On-Chip In-Amp and Reference. The AD7792/AD7793 features a dual use data out ready DOUT/RDY output. In order to avoid contentions on the SPI bus, it's necessary to use spi bus locking. The DOUT/RDY output must also be wired to an interrupt capable GPIO. In INDIO_RING_TRIGGERED mode, this driver may block its SPI bus segment for an extended period of time. Changes since V1: Use bool where applicable. Use data buffer that lives in their own cache line. Restructure ad7793_calibrate_all to use an array. Use msleep. Query REG_ID instead of doing a write/read This is a test. Add support for unipolar mode. Drop range attribute in favor of write scale. Add proper locking. Use new validate_trigger callbacks. Use IIO_IN_DIFF for differential channels. Change attribute naming. Use available_scan_masks. Some other miscellaneous cleanup (none functional changes). Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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