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iio: stx104: Add IIO support for the ADC channels

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The Apex Embedded Systems STX104 features 16 channels of single-ended (8
channels of true differential) 16-bit analog input. Differential input
configuration may be selected via a physical jumper on the device.
Similarly, input polarity (unipolar/bipolar) is configured via a
physical jumper on the device.

Input gain selection is available to the user via software, thus
allowing eight possible input ranges: +-10V, +-5V, +-2.5V, +-1.25V,
0 to 10V, 0 to 5V, 0 to 2.5V, and 0 to 1.25V. Four input gain
configurations are supported: x1, x2, x4, and x8.

This ADC resolution is 16-bits (1/65536 of full scale). Analog input
samples are taken on software trigger; neither FIFO sampling nor
interrupt triggering is supported by this driver.

The Apex Embedded Systems STX104 is primarily an analog-to-digital
converter device. The STX104 IIO driver was initially placed in the DAC
directory because only the DAC portion of the STX104 was supported at
the time. Now that ADC support has been added to the STX104 IIO driver,
the driver should be moved to the more appropriate ADC directory.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
William Breathitt Gray
2016-08-29 16:22:56 -04:00
committed by Jonathan Cameron
parent c060991912
commit 4075a283ae
6 changed files with 145 additions and 35 deletions
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15
drivers/iio/adc/Kconfig
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@@ -418,6 +418,21 @@ config ROCKCHIP_SARADC
To compile this driver as a module, choose M here: the
module will be called rockchip_saradc.
config STX104
tristate "Apex Embedded Systems STX104 driver"
depends on X86 && ISA_BUS_API
select GPIOLIB
help
Say yes here to build support for the Apex Embedded Systems STX104
integrated analog PC/104 card.
This driver supports the 16 channels of single-ended (8 channels of
differential) analog inputs, 2 channels of analog output, 4 digital
inputs, and 4 digital outputs provided by the STX104.
The base port addresses for the devices may be configured via the base
array module parameter.
config TI_ADC081C
tristate "Texas Instruments ADC081C/ADC101C/ADC121C family"
depends on I2C