diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2011-08-17 17:29:34 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-23 13:40:46 -0700 |
| commit | 7a27b042f9cf6bd6e60c236a55d7a71a64287a84 (patch) | |
| tree | b3d2c86993dfb5ca03e023f1bf50f45fb81f28c6 /drivers/staging/iio/Documentation | |
| parent | 88b42f3a75ee53a4943069d4f8206f3c8d56bd58 (diff) | |
IIO: ADC: New driver for AD7190/AD7192/AD7195 4 Channel SPI ADC
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>
Diffstat (limited to 'drivers/staging/iio/Documentation')
| -rw-r--r-- | drivers/staging/iio/Documentation/sysfs-bus-iio | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio b/drivers/staging/iio/Documentation/sysfs-bus-iio index 5f99f88d1b2d..c19dbf4ab249 100644 --- a/drivers/staging/iio/Documentation/sysfs-bus-iio +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio @@ -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. |