linux-toradex.git/drivers/iio/industrialio-buffer.c, branch v3.15-rc1

iio get rid of unneccessary error_ret

2014-02-18T08:46:36+00:00

Get rid of obsolete uses of goto error_ret and some empty lines.

Signed-off-by: Hartmut Knaack 
Signed-off-by: Jonathan Cameron

iio: Add support for blocking IO on buffers

2013-12-03T20:22:29+00:00

Currently the IIO buffer interface only allows non-blocking reads. This patch
adds support for blocking IO. In blocking mode the thread will go to sleep if no
data is available and will wait for the buffer implementation to signal that new
data is available by waking up the buffers waitqueue.

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

iio: Add data_available callback for buffers

2013-12-03T20:22:28+00:00

This patch adds a new data_available() callback to the iio_buffer_access_funcs
struct. The callback is used to indicate whether data is available in the buffer
for reading. It is meant to replace the stufftoread flag from the iio_buffer
struct. The reasoning for this is that the buffer implementation usually can
determine whether data is available rather easily based on its state, on the
other hand it can be rather tricky to update the stufftoread flag in a race free
way.

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

Merge 3.12-rc6 into staging-next.

2013-10-19T20:14:34+00:00

We want these fixes in here as well.

Signed-off-by: Greg Kroah-Hartman

iio: Remove unused iio_sw_buffer_preenable()

2013-10-16T18:17:06+00:00

The functionality implemented by iio_sw_buffer_preenable() is now done directly
in the IIO core and previous users of iio_sw_buffer_preenable() have all been
updated to not use it anymore. It is unused now and can be remove.

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

iio: Update buffer's bytes per datum after updating the scan mask

2013-10-16T18:09:27+00:00

Currently a IIO device driver needs to make sure to update the buffer's bytes
per datum after the scan mask has changed. This is usually done in the preenable
callback by invoking iio_sw_buffer_preenable(). This is something that needs to
be done and is done for virtually all devices which support buffers (we
currently have only one exception). Also this a bit of a layering violation
since we have to call the buffer setup ops from the device setup ops. This
requires the device driver to know about the internal requirements of the buffer
(e.g. whether we need to call the set_bytes_per_datum) callback. And especially
with in-kernel buffer consumers, which allows to attach arbitrary buffers to a
device, this is something that the driver can't know.

Moving this to the core allows us to drop the individual calls to
iio_sw_buffer_preenable() from drivers.

Signed-off-by: Lars-Peter Clausen 
Cc: Denis Ciocca 
Cc: Marek Vasut 
Cc: Zubair Lutfullah 
Cc: Jacek Anaszewski 
Signed-off-by: Jonathan Cameron

iio:buffer: Free active scan mask in iio_disable_all_buffers()

2013-10-15T18:26:43+00:00

Usually the active scan mask is freed in __iio_update_buffers() when the buffer
is disabled. But when the device is still sampling when it is removed we'll end
up disabling the buffers in iio_disable_all_buffers(). So we also need to free
the active scan mask here, otherwise it will be leaked.

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

iio:buffer: Ignore noop requests for iio_update_buffers()

2013-10-12T12:06:31+00:00

Since the kernel now disables all buffers when a device is unregistered it might
happen that a in-kernel consumer tries to disable that buffer again. So ignore
requests where the buffer already is in the desired state.

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:buffer: Add proper locking for iio_update_buffers()

2013-10-12T11:07:11+00:00

We need to make sure that in-kernel users of iio_update_buffers() do not race
against each other or against unregistration of the device. So we need to take
both the mlock and the info_exist_lock when calling iio_update_buffers() from a
in-kernel consumer.

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