613cbb91e9
The CSI2 specification specifies a standard method to access camera sensor registers called "Camera Control Interface (CCI)". This uses either 8 or 16 bit (big-endian wire order) register addresses and supports 8, 16, 24 or 32 bit (big-endian wire order) register widths. Currently a lot of Linux camera sensor drivers all have their own custom helpers for this, often copy and pasted from other drivers. Add a set of generic helpers for this so that all sensor drivers can switch to a single common implementation. These helpers take an extra optional "int *err" function parameter, this can be used to chain a bunch of register accesses together with only a single error check at the end, rather than needing to error check each individual register access. The first failing call will set the contents of err to a non 0 value and all other calls will then become no-ops. Link: https://lore.kernel.org/linux-media/59aefa7f-7bf9-6736-6040-39551329cd0a@redhat.com/ Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Tommaso Merciai <tomm.merciai@gmail.com> Reviewed-by: Tommaso Merciai <tomm.merciai@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org> |
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| .. | ||
| drivers | ||
| camera-sensor.rst | ||
| cec-core.rst | ||
| dtv-ca.rst | ||
| dtv-common.rst | ||
| dtv-core.rst | ||
| dtv-demux.rst | ||
| dtv-frontend.rst | ||
| dtv-net.rst | ||
| index.rst | ||
| maintainer-entry-profile.rst | ||
| mc-core.rst | ||
| rc-core.rst | ||
| tx-rx.rst | ||
| v4l2-async.rst | ||
| v4l2-cci.rst | ||
| v4l2-common.rst | ||
| v4l2-controls.rst | ||
| v4l2-core.rst | ||
| v4l2-dev.rst | ||
| v4l2-device.rst | ||
| v4l2-dv-timings.rst | ||
| v4l2-event.rst | ||
| v4l2-fh.rst | ||
| v4l2-flash-led-class.rst | ||
| v4l2-fwnode.rst | ||
| v4l2-intro.rst | ||
| v4l2-mc.rst | ||
| v4l2-mediabus.rst | ||
| v4l2-mem2mem.rst | ||
| v4l2-rect.rst | ||
| v4l2-subdev.rst | ||
| v4l2-tuner.rst | ||
| v4l2-tveeprom.rst | ||
| v4l2-videobuf2.rst | ||
| v4l2-videobuf.rst | ||