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Add driver for Intel Computer Vision Sensing (CVS) devices found on
Intel Luna Lake (LNL), Panther Lake (PTL), and Arrow Lake (ARL)
platforms.
The CVS device acts as a V4L2 sub-device bridge that manages CSI-2
link ownership between the host (Linux) and firmware for camera
sensors. It provides:
- Query the device status via sysfs interface
- CSI-2 link ownership arbitration between host and CVS firmware
- MIPI CSI-2 configuration management
- Privacy LED control coordination
- Power management integration with runtime PM
The driver consists of two main components:
core.c: Core driver with probe, command transport, and power management
v4l2.c: V4L2 sub-device and media framework integration
Hardware Interface:
- I2C for command/control communication with device firmware
- GPIO signals for ownership handshaking (request/response)
- Optional reset and wake interrupt for full-capability variants
- Integration with Intel IPU via ipu_bridge
The driver supports two hardware capability levels:
- Light capability: Basic GPIO-based ownership (2 GPIOs)
- Full capability: Enhanced with reset control and wake IRQ (4 GPIOs)
Device-specific quirks are handled via a quirk table to accommodate
variations across different CVS implementations (Lattice, Synaptics).
In addition to I2C-based operation, the driver supports platform
device instantiation for systems where CVS is exposed without I2C
transport, falling back to GPIO-only ownership control.
The CVS driver integrates with the IPU bridge for automatic device
discovery via ACPI on supported platforms.
PCI device IDs for Intel IPU7 (0x645d, shared by MTL and LNL) and
IPU7.5 (0xb05d, shared by ARL and PTL) are included in the
driver-local icvs_pci_tbl lookup table, enabling CVS to locate these
IPU variants without modifying the shared ipu6-pci-table header.
A PM runtime device link is established between IPU (consumer) and CVS
(supplier) so that the PM framework automatically resumes CVS before
IPU begins streaming, triggering cvs_runtime_resume() to claim CSI-2
link ownership. Ownership is released via cvs_runtime_suspend() after
the autosuspend delay.
Signed-off-by: Miguel Vadillo <miguel.vadillo@intel.com>
Tested-by: Mehdi Djait <mehdi.djait@linux.intel.com> # Dell XPS 13 9350 + IPU7
Reviewed-by: Mehdi Djait <mehdi.djait@linux.intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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