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Commit f94aa354 authored by Michael Hennerich's avatar Michael Hennerich Committed by Greg Kroah-Hartman
Browse files

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: default avatarMichael Hennerich <michael.hennerich@analog.com>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 2051f25d

drivers/staging/iio/Documentation/sysfs-bus-iio-impedance-analyzer-ad5933

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What:		/sys/bus/iio/devices/iio:deviceX/outY_freq_start

KernelVersion:	3.1.0

Contact:	linux-iio@vger.kernel.org

Description:

		Frequency sweep start frequency in Hz.



What:		/sys/bus/iio/devices/iio:deviceX/outY_freq_increment

KernelVersion:	3.1.0

Contact:	linux-iio@vger.kernel.org

Description:

		Frequency increment in Hz (step size) between consecutive

		frequency points along the sweep.



What:		/sys/bus/iio/devices/iio:deviceX/outY_freq_points

KernelVersion:	3.1.0

Contact:	linux-iio@vger.kernel.org

Description:

		Number of frequency points (steps) in the frequency sweep.

		This value, in conjunction with the outY_freq_start and the

		outY_freq_increment, determines the frequency sweep range

		for the sweep operation.



What:		/sys/bus/iio/devices/iio:deviceX/outY_settling_cycles

KernelVersion:	3.1.0

Contact:	linux-iio@vger.kernel.org

Description:

		Number of output excitation cycles (settling time cycles)

		that are allowed to pass through the unknown impedance,

		after each frequency increment, and before the ADC is triggered

		to perform a conversion sequence of the response signal.

drivers/staging/iio/Kconfig

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@@ -62,6 +62,7 @@ source "drivers/staging/iio/addac/Kconfig" 
source "drivers/staging/iio/dac/Kconfig"

source "drivers/staging/iio/dds/Kconfig"

source "drivers/staging/iio/gyro/Kconfig"

source "drivers/staging/iio/impedance-analyzer/Kconfig"

source "drivers/staging/iio/imu/Kconfig"

source "drivers/staging/iio/light/Kconfig"

source "drivers/staging/iio/magnetometer/Kconfig"

drivers/staging/iio/Makefile

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@@ -16,6 +16,7 @@ obj-y += addac/ 
obj-y += dac/

obj-y += dds/

obj-y += gyro/

obj-y += impedance-analyzer/

obj-y += imu/

obj-y += light/

obj-y += magnetometer/

drivers/staging/iio/impedance-analyzer/Kconfig

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#

# 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.

drivers/staging/iio/impedance-analyzer/Makefile

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#

# Makefile for Impedance Converter, Network Analyzer drivers

#



obj-$(CONFIG_AD5933) += ad5933.o