iio: impedance-analyzer: New driver for AD5933/4 Impedance Converter, Network Analyzer

The AD5933 is a high precision impedance converter system solution
that combines an on-board frequency generator with a 12-bit, 1 MSPS,
analog-to-digital converter (ADC). The frequency generator allows an
external complex impedance to be excited with a known frequency.

The response signal from the impedance is sampled by the on-board ADC
and a discrete Fourier transform (DFT) is processed by an on-chip DSP engine.
The DFT algorithm returns a real (R) and imaginary (I) data-word at each
output frequency.

Changes since V1:

Apply list review feedback:
Consistently use poll_time_jiffies.
Use be|le cpu endian helpers where applicable.
Add various comments.

Changes since V2:

Fix KernelVersion tag in Documentation.
Declare ad5933_default_pdata static.
Fix typos.

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>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/staging/iio/impedance-analyzer/Kconfig b/drivers/staging/iio/impedance-analyzer/Kconfig
new file mode 100644
index 0000000..9e91a9b
--- /dev/null
+++ b/drivers/staging/iio/impedance-analyzer/Kconfig
@@ -0,0 +1,16 @@
+#
+# Impedance Converter, Network Analyzer drivers
+#
+comment "Network Analyzer, Impedance Converters"
+
+config AD5933
+	tristate "Analog Devices AD5933, AD5934 driver"
+	depends on I2C
+	select IIO_RING_BUFFER
+	select IIO_SW_RING
+	help
+	  Say yes here to build support for Analog Devices Impedance Converter,
+	  Network Analyzer, AD5933/4, provides direct access via sysfs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad5933.