kernel/linux.git/drivers/iio/iio_core.h, branch linux-4.4.y

iio: Move buffer registration to the core

2014-12-12T12:28:31+00:00

Originally device and buffer registration were kept as separate operations in IIO to allow to register two distinct sets of channels for buffered and non-buffered operations. This has since already been further restricted and the channel set registered for the buffer needs to be a subset of the channel set registered for the device. Additionally the possibility to not have a raw (or processed) attribute for a channel which was registered for the device was added a while ago. This means it is possible to not register any device level attributes for a channel even if it is registered for the device. Also if a channel's scan_index is set to -1 and the channel is registered for the buffer it is ignored. So in summary it means it is possible to register the same channel array for both the device and the buffer yet still end up with distinctive sets of channels for both of them. This makes the argument for having to have to manually register the channels for both the device and the buffer invalid. Considering that the vast majority of all drivers want to register the same set of channels for both the buffer and the device it makes sense to move the buffer registration into the core to avoid some boiler-plate code in the device driver setup path. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron

IIO: core: Introduce read_raw_multi

2014-04-29T21:05:32+00:00

This callback is introduced to overcome some limitations of existing read_raw callback. The functionality of both existing read_raw and read_raw_multi is similar, both are used to request values from the device. The current read_raw callback allows only two return values. The new read_raw_multi allows returning multiple values. Instead of passing just address of val and val2, it passes length and pointer to values. Depending on the type and length of passed buffer, iio client drivers can return multiple values. Signed-off-by: Srinivas Pandruvada Signed-off-by: Jonathan Cameron

iio: Factor IIO value formating into its own function

2013-10-12T11:23:33+00:00

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

iio: Add a helper to free a list of IIO device attributes

2013-10-12T11:17:34+00:00

We have the same code to free a IIO device attribute list in multiple place. This patch adds a new helper function to take care of this and replaces the custom instances with a call to the helper function. Note that we do not need to call list_del() for each of the list items since we will never look at any of the list items nor the list itself again. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron

iio: Wakeup poll and blocking reads when the device is unregistered

2013-10-12T11:05:36+00:00

Once the device has been unregistered there won't be any new data no matter how long a userspace application waits, so we might as well wake them up and let them know. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron

Merge 3.12-rc2 into staging-next.

2013-09-25T15:59:04+00:00

This resolves the merge problem with two iio drivers that Stephen Rothwell pointed out. Reported-by: Stephen Rothwell Signed-off-by: Greg Kroah-Hartman

iio: Stop sampling when the device is removed

2013-09-21T11:36:30+00:00

Make sure to stop sampling when the device is removed, otherwise it will continue to sample forever. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron

iio: refactor info mask and ext_info attribute creation.

2013-09-15T16:43:20+00:00

Introduce an enum to specify whether the attribute is separate or shared. Factor out the bitmap handling for loop into a separate function. Tidy up error handling and add a NULL assignment to squish a false positive warning from GCC. Change ext_info shared type from boolean to enum and update in all drivers. Signed-off-by: Jonathan Cameron Reviewed-by: Lars-Peter Clausen

iio: Add OF support

2013-03-16T10:17:59+00:00

Provide bindings and parse OF data during initialization. Signed-off-by: Guenter Roeck Reviewed-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron

IIO: Move the core files to drivers/iio

2012-04-25T18:11:38+00:00

Take the core support + the kfifo buffer implentation out of staging. Whilst we are far from done in improving this subsystem it is now at a stage where the userspae interfaces (provided by the core) can be considered stable. Drivers will follow over a longer time scale. Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman