linux-toradex.git/include/uapi/linux/iio, branch v6.11-rc2

iio: core: Add new DMABUF interface infrastructure

2024-06-30T10:29:17+00:00

Add the necessary infrastructure to the IIO core to support a new
optional DMABUF based interface.

With this new interface, DMABUF objects (externally created) can be
attached to a IIO buffer, and subsequently used for data transfer.

A userspace application can then use this interface to share DMABUF
objects between several interfaces, allowing it to transfer data in a
zero-copy fashion, for instance between IIO and the USB stack.

The userspace application can also memory-map the DMABUF objects, and
access the sample data directly. The advantage of doing this vs. the
read() interface is that it avoids an extra copy of the data between the
kernel and userspace. This is particularly userful for high-speed
devices which produce several megabytes or even gigabytes of data per
second.

As part of the interface, 3 new IOCTLs have been added:

IIO_BUFFER_DMABUF_ATTACH_IOCTL(int fd):
 Attach the DMABUF object identified by the given file descriptor to the
 buffer.

IIO_BUFFER_DMABUF_DETACH_IOCTL(int fd):
 Detach the DMABUF object identified by the given file descriptor from
 the buffer. Note that closing the IIO buffer's file descriptor will
 automatically detach all previously attached DMABUF objects.

IIO_BUFFER_DMABUF_ENQUEUE_IOCTL(struct iio_dmabuf *):
 Request a data transfer to/from the given DMABUF object. Its file
 descriptor, as well as the transfer size and flags are provided in the
 "iio_dmabuf" structure.

These three IOCTLs have to be performed on the IIO buffer's file
descriptor, obtained using the IIO_BUFFER_GET_FD_IOCTL() ioctl.

Signed-off-by: Paul Cercueil 
Co-developed-by: Nuno Sa 
Signed-off-by: Nuno Sa 
Link: https://patch.msgid.link/20240620122726.41232-4-paul@crapouillou.net
Signed-off-by: Jonathan Cameron

iio: move LIGHT_UVA and LIGHT_UVB to the end of iio_modifier

2024-01-28T13:40:19+00:00

The new modifiers should have added to the end of the enum, so they do
not affect the existing entries.

No modifiers were added since then, so they can be moved safely to the
end of the list.

Move IIO_MOD_LIGHT_UVA and IIO_MOD_LIGHT_UVB to the end of iio_modifier.

Fixes: b89710bd215e ("iio: add modifiers for A and B ultraviolet light")
Suggested-by: Paul Cercueil 
Signed-off-by: Javier Carrasco 
Link: https://lore.kernel.org/r/20240127200208.185815-1-javier.carrasco.cruz@gmail.com
Signed-off-by: Jonathan Cameron

iio: add modifiers for A and B ultraviolet light

2023-12-04T13:57:24+00:00

Currently there are only two modifiers for ultraviolet light: a generic
one for any ultraviolet light (IIO_MOD_LIGHT_UV) and one for deep
ultraviolet (IIO_MOD_LIGHT_DUV), which is also referred as ultraviolet
C (UV-C) band and covers short-wave ultraviolet.

There are still no modifiers for the long-wave and medium-wave
ultraviolet bands. These two bands are the main components used to
obtain the UV index on the Earth's surface.

Add modifiers for the ultraviolet A (UV-A) and ultraviolet B (UV-B)
bands.

Signed-off-by: Javier Carrasco 
Link: https://lore.kernel.org/r/20231110-veml6075-v3-1-6ee46775b422@gmail.com
Signed-off-by: Jonathan Cameron

Merge branch 'ib-iio-hid-sensors-v6.6-rc1' into togreg

2023-09-24T12:39:25+00:00

The deta angle and deta velocity channels were added in parallel with
color temperature and chromacity so this merge had to assign a
consistent order. I put the color related ones second.

Signed-off-by: Jonathan Cameron

iio: Add channel type for chromaticity

2023-09-24T12:31:31+00:00

In most cases, ambient color sensors also support the x and y light
colors, which represent the coordinates on the CIE 1931 chromaticity
diagram. Thus, add channel type for chromaticity.

Signed-off-by: Basavaraj Natikar 
Link: https://lore.kernel.org/r/20230919081054.2050714-7-Basavaraj.Natikar@amd.com
Signed-off-by: Jonathan Cameron

iio: Add channel type light color temperature

2023-09-24T12:22:52+00:00

In most cases, ambient color sensors also support light color
temperature, which is measured in kelvin. Thus, add channel type light
color temperature.

Signed-off-by: Basavaraj Natikar 
Link: https://lore.kernel.org/r/20230919081054.2050714-3-Basavaraj.Natikar@amd.com
Signed-off-by: Jonathan Cameron

iio: Add IIO_DELTA_VELOCITY channel type

2023-09-12T09:42:03+00:00

The delta velocity is defined as a piece-wise integration of
acceleration data. The delta velocity represents the linear velocity
change between two consecutive measurements and it
is measured in m / s (meters per second).

In order to track the total linear velocity change during a desired
period of time, simply sum-up the delta velocity samples acquired
during that time.

IIO currently does not offer a suitable channel type for this
type of measurements hence this patch adds it.

Signed-off-by: Ramona Bolboaca 
Reviewed-by: Nuno Sa 
Link: https://lore.kernel.org/r/20230808075059.645525-3-ramona.bolboaca@analog.com
Signed-off-by: Jonathan Cameron

iio: Add IIO_DELTA_ANGL channel type

2023-09-12T09:42:03+00:00

The delta angle is defined as a piece-wise integration of angular
velocity data. The delta angle represents the amount of
angular displacement between two consecutive measurements and it
is measured in radians.

In order to track the total angular displacement during a desired
period of time, simply sum-up the delta angle samples acquired
during that time.

IIO currently does not offer a suitable channel type for this
type of measurements hence this patch adds it.

Signed-off-by: Ramona Bolboaca 
Reviewed-by: Nuno Sa 
Link: https://lore.kernel.org/r/20230808075059.645525-2-ramona.bolboaca@analog.com
Signed-off-by: Jonathan Cameron

iio: add modifers for pitch, yaw, roll

2022-09-21T17:42:55+00:00

Add modifiers for reporting rotations as euler angles (i.e. yaw, pitch and
roll).

Signed-off-by: Andrea Merello 
Reviewed-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20220907132205.28021-5-andrea.merello@iit.it
Signed-off-by: Jonathan Cameron

iio: add modifiers for linear acceleration

2022-09-21T17:42:55+00:00

Add IIO_MOD_LINEAR_X, IIO_MOD_LINEAR_Y and IIO_MOD_LINEAR_Z modifiers to te
IIO core, which is preparatory for adding the Bosch BNO055 IMU driver.

Bosch BNO055 IMU can report raw accelerations (among x, y and z axis) as
well as the so called "linear accelerations" (again, among x, y and z axis)
which is basically the acceleration after subtracting gravity and for which
those new modifiers are for.

Signed-off-by: Andrea Merello 
Reviewed-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20220907132205.28021-2-andrea.merello@iit.it
Signed-off-by: Jonathan Cameron