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IIO: ADC: New driver for AD7190/AD7192/AD7195 4 Channel SPI ADC

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New driver for AD7190/AD7192/AD7195 4.8 kHz, Ultralow Noise, 24-Bit
Sigma-Delta ADC with PGA

These devices 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:

Add missing documentation.
Remove obsoleted include files.
Fix typos and style issues.
Fix buffer size.
Split ad7192_show() into two functions.
Avoid race condition add mutex.
Abandon IIO_CHAN macro.
Reorder elements in ad7192_platform_data.
Remove driver bus type.

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>
This commit is contained in:
Michael Hennerich 2011-08-17 17:29:34 +02:00 committed by Greg Kroah-Hartman
parent 88b42f3a75
commit 7a27b042f9
5 changed files with 1272 additions and 0 deletions
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21
drivers/staging/iio/Documentation/sysfs-bus-iio
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@ -711,3 +711,24 @@ Contact: linux-iio@xxxxxxxxxxxxxxx
Description:
This attribute is used to read the amount of quadrature error
present in the device at a given time.
What: /sys/.../iio:deviceX/ac_excitation_en
KernelVersion: 3.1.0
Contact: linux-iio@vger.kernel.org
Description:
This attribute, if available, is used to enable the AC
excitation mode found on some converters. In ac excitation mode,
the polarity of the excitation voltage is reversed on
alternate cycles, to eliminate DC errors.
What: /sys/.../iio:deviceX/bridge_switch_en
KernelVersion: 3.1.0
Contact: linux-iio@vger.kernel.org
Description:
This attribute, if available, is used to close or open the
bridge power down switch found on some converters.
In bridge applications, such as strain gauges and load cells,
the bridge itself consumes the majority of the current in the
system. To minimize the current consumption of the system,
the bridge can be disconnected (when it is not being used
using the bridge_switch_en attribute.

14
drivers/staging/iio/adc/Kconfig
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@ -161,6 +161,20 @@ config AD7816
Say yes here to build support for Analog Devices AD7816/7/8
temperature sensors and ADC.
config AD7192
tristate "Analog Devices AD7190 AD7192 AD7195 ADC driver"
depends on SPI
select IIO_RING_BUFFER
select IIO_SW_RING
select IIO_TRIGGER
help
Say yes here to build support for Analog Devices AD7190,
AD7192 or AD7195 SPI analog to digital convertors (ADC).
If unsure, say N (but it's safe to say "Y").
To compile this driver as a module, choose M here: the
module will be called ad7192.
config ADT75
tristate "Analog Devices ADT75 temperature sensor driver"
depends on I2C

1
drivers/staging/iio/adc/Makefile
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@ -37,6 +37,7 @@ obj-$(CONFIG_AD7745) += ad7745.o
obj-$(CONFIG_AD7780) += ad7780.o
obj-$(CONFIG_AD7793) += ad7793.o
obj-$(CONFIG_AD7816) += ad7816.o
obj-$(CONFIG_AD7192) += ad7192.o
obj-$(CONFIG_ADT75) += adt75.o
obj-$(CONFIG_ADT7310) += adt7310.o
obj-$(CONFIG_ADT7410) += adt7410.o

1189
drivers/staging/iio/adc/ad7192.c Normal file
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File diff suppressed because it is too large Load Diff

47
drivers/staging/iio/adc/ad7192.h Normal file
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@ -0,0 +1,47 @@
/*
* AD7190 AD7192 AD7195 SPI ADC driver
*
* Copyright 2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#ifndef IIO_ADC_AD7192_H_
#define IIO_ADC_AD7192_H_
/*
* TODO: struct ad7192_platform_data needs to go into include/linux/iio
*/
/**
* struct ad7192_platform_data - platform/board specific information
* @vref_mv: the external reference voltage in millivolt
* @clock_source_sel: [0..3]
* 0 External 4.92 MHz clock connected from MCLK1 to MCLK2
* 1 External Clock applied to MCLK2
* 2 Internal 4.92 MHz Clock not available at the MCLK2 pin
* 3 Internal 4.92 MHz Clock available at the MCLK2 pin
* @ext_clk_Hz: the external clock frequency in Hz, if not set
* the driver uses the internal clock (16.776 MHz)
* @refin2_en: REFIN1/REFIN2 Reference Select (AD7190/2 only)
* @rej60_en: 50/60Hz notch filter enable
* @sinc3_en: SINC3 filter enable (default SINC4)
* @chop_en: CHOP mode enable
* @buf_en: buffered input mode enable
* @unipolar_en: unipolar mode enable
* @burnout_curr_en: constant current generators on AIN(+|-) enable
*/
struct ad7192_platform_data {
u16 vref_mv;
u8 clock_source_sel;
u32 ext_clk_Hz;
bool refin2_en;
bool rej60_en;
bool sinc3_en;
bool chop_en;
bool buf_en;
bool unipolar_en;
bool burnout_curr_en;
};
#endif /* IIO_ADC_AD7192_H_ */