linux.git/include/linux/iio, branch v4.7-rc2

iio:ak8975: add mounting matrix support

2016-04-23T21:14:34+00:00

Expose a rotation matrix to indicate userspace the chip orientation with
respect to the overall hardware system.
Matrix is retrieved from "in_mount_matrix". It is declared into ak8975 DTS
entry as a "mount-matrix" property.

Signed-off-by: Gregor Boirie 
Acked-by: Rob Herring 
Signed-off-by: Jonathan Cameron

iio:core: mounting matrix support

2016-04-23T21:13:05+00:00

Expose a rotation matrix to indicate userspace the chip placement with
respect to the overall hardware system. This is needed to adjust
coordinates sampled from a sensor chip when its position deviates from the
main hardware system.

Final coordinates computation is delegated to userspace since:
* computation may involve floating point arithmetics ;
* it allows an application to combine adjustments with arbitrary
  transformations.

This 3 dimentional space rotation matrix is expressed as 3x3 array of
strings to support floating point numbers. It may be retrieved from a
"[_][_]mount_matrix" sysfs attribute file. It is declared into a
device / driver specific DTS property or platform data.

Signed-off-by: Gregor Boirie 
Signed-off-by: Jonathan Cameron

iio: core: Add devm_ APIs for iio_channel_{get,release}_all

2016-04-19T18:58:15+00:00

Some of kernel driver uses the IIO framework to get the sensor
value via ADC or IIO HW driver. The client driver get iio channel
by iio_channel_get_all() and release it by calling
iio_channel_release_all().

Add resource managed version (devm_*) of these APIs so that if client
calls the devm_iio_channel_get_all() then it need not to release it
explicitly, it can be done by managed device framework when driver
get un-binded.

This reduces the code in error path and also need of .remove callback in
some cases.

Signed-off-by: Laxman Dewangan 
Signed-off-by: Jonathan Cameron

iio: core: Add devm_ APIs for iio_channel_{get,release}

2016-04-19T18:58:14+00:00

Some of kernel driver uses the IIO framework to get the sensor
value via ADC or IIO HW driver. The client driver get iio channel
by iio_channel_get() and release it by calling iio_channel_release().

Add resource managed version (devm_*) of these APIs so that if client
calls the devm_iio_channel_get() then it need not to release it explicitly,
it can be done by managed device framework when driver get un-binded.

This reduces the code in error path and also need of .remove callback in
some cases.

Signed-off-by: Laxman Dewangan 
Signed-off-by: Jonathan Cameron

iio: st_sensors: support open drain mode

2016-04-19T18:58:13+00:00

Some types of ST Sensors can be connected to the same IRQ line
as other peripherals using open drain. Add a device tree binding
and a sensor data property to flip the right bit in the interrupt
control register to enable open drain mode on the INT line.

If the line is set to be open drain, also tag on IRQF_SHARED
to the IRQ flags when requesting the interrupt, as the whole
point of using open drain interrupt lines is to share them with
more than one peripheral (wire-or).

Cc: devicetree@vger.kernel.org
Cc: Giuseppe Barba 
Cc: Denis Ciocca 
Acked-by: Rob Herring 
Signed-off-by: Linus Walleij 
Signed-off-by: Jonathan Cameron

iio: st_sensors: verify interrupt event to status

2016-04-19T18:58:12+00:00

This makes all ST sensor drivers check that they actually have
new data available for the requested channel(s) before claiming
an IRQ, by reading the status register (which is conveniently
the same for all ST sensors) and check that the channel has new
data before proceeding to read it and fill the buffer.

This way sensors can share an interrupt line: it can be flaged
as shared and then the sensor that did not fire will return
NO_IRQ, and the sensor that fired will handle the IRQ and
return IRQ_HANDLED.

Cc: Giuseppe Barba 
Cc: Denis Ciocca 
Signed-off-by: Linus Walleij 
Signed-off-by: Jonathan Cameron

iio:adis: Add support for manual self-test flag clear

2016-04-16T12:42:43+00:00

Some variants of the devices from the ADIS family don't auto-clear the
self-test bit after the self-test has completed. Instead we have to
manually clear. Add support for this to the ADIS library.

Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Jonathan Cameron

iio: buffer: add missing descriptions in iio_buffer_access_funcs

2016-04-03T09:27:49+00:00

The members buffer_group and attrs of iio_buffer_access_funcs have no
descriptions for the documentation. Adding them.

Fixes: 08e7e0adaa17 ("iio: buffer: Allocate standard attributes in the core")
Signed-off-by: Luis de Bethencourt 
Signed-off-by: Jonathan Cameron

iio: core: implement iio_device_{claim|release}_direct_mode()

2016-03-12T11:17:19+00:00

It is often the case that the driver wants to be sure a device stays
in direct mode while it is executing a task or series of tasks.  To
accomplish this today, the driver performs this sequence: 1) take the
device state lock, 2) verify it is not in a buffered mode, 3) execute
some tasks, and 4) release that lock.

This patch introduces a pair of helper functions that simplify these
steps and make it more semantically expressive.

iio_device_claim_direct_mode()
        If the device is not in any buffered mode it is guaranteed
        to stay that way until iio_release_direct_mode() is called.

iio_device_release_direct_mode()
        Release the claim. Device is no longer guaranteed to stay
        in direct mode.

Signed-off-by: Alison Schofield 
Signed-off-by: Jonathan Cameron

iio: Fix typos in the struct iio_event_spec documentation comments

2016-02-17T21:11:08+00:00

This patch fixes a few minor typos in the documentation comments for the
scan_type member of the iio_event_spec structure. The sign member name
was improperly capitalized as "Sign" in the comments. The storagebits
member name was improperly listed as "storage_bits" in the comments. The
endianness member entry in the comments was moved after the repeat
member entry in order to maintain consistency with the actual struct
iio_event_spec layout.

Signed-off-by: William Breathitt Gray 
Signed-off-by: Jonathan Cameron