Link to issue: linux-surface/linux-surface#91
in the root of this repository, run
makeIntel maintains IPU4 (not IPU3) drivers (crlmodule, ipu4-acpi, and ipu4) at linux-intel-lts repo (up to v4.19):
Especially, we may be interested in the crlmodule and ipu4-acpi drivers:
- https://github.com/intel/linux-intel-lts/tree/4.19/base/drivers/media/i2c/crlmodule
- https://github.com/intel/linux-intel-lts/blob/4.19/base/drivers/media/platform/intel/ipu4-acpi.c
The crlmodule looks like the common driver for sensors. "CRL" stands for "common/configurable register list":
Common register list based driver is based on a sensor configuration file created for a specific sensor module based on a set of rules.
Other places providing IPU4 drivers:
- https://github.com/intel/intel-camera-drivers [out-of-tree driver files, outdated]
- https://github.com/clearlinux-pkgs/linux-iot-lts2018 [as patch files]
- https://github.com/clearlinux-pkgs/linux-iot-lts2018-preempt-rt [same as above]
Some Chromebooks use IPU3 with almost the same sensor drivers as upstream. But the sensor driver works anyway because Chromebooks handle power-managements at rather firmware through runtime_pm:
- https://github.com/coreboot/coreboot/blob/master/src/mainboard/google/poppy/variants/baseboard/include/baseboard/acpi/camera_pmic.asl
- https://github.com/torvalds/linux/blob/e9919e11e219eaa5e8041b7b1a196839143e9125/drivers/media/i2c/ov5670.c#L2515-L2518
links to ACPI asl files for devices with IPU3:
- https://github.com/coreboot/coreboot/tree/master/src/mainboard/google/poppy/variants/baseboard/include/baseboard/acpi
- https://github.com/coreboot/coreboot/tree/master/src/mainboard/google/poppy/variants/atlas/include/variant/acpi
- https://github.com/coreboot/coreboot/tree/master/src/mainboard/google/poppy/variants/nautilus/include/variant/acpi
- https://github.com/coreboot/coreboot/tree/master/src/mainboard/google/poppy/variants/nocturne/include/variant/acpi
links to ACPI asl files for devices with IPU4: