27 lines
1.1 KiB
Markdown
27 lines
1.1 KiB
Markdown
# libfprint GXFP5130 integration skeleton
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This driver connects libfprint's `FpImageDevice` state machine to the
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hardware-tested `gxfp_session` API. Blocking sensor operations run in a GLib
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worker thread; all libfprint callbacks run in the main context.
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Current discovery is intentionally explicit because the sensor is an ACPI
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platform/character device, while upstream libfprint has no generic ACPI char
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device discovery type. Build the driver as an optional virtual-type driver and
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start libfprint/fprintd with:
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```sh
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FP_GXFP5130=/dev/gxfp
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```
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The integration must add `gxfp5130` to `drivers_info` and
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`libfprint_drivers_sources` in upstream Meson, include this file, add the GXFP
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headers, and link the PIC-built `libgxfp.a` plus mbedTLS libraries.
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The first image path uses the verified 64x80 sample order and the deterministic
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`gxfp_image12_to_u8()` conversion. No transpose, flip, inversion, percentile
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clipping, or unverified `0x21` command is applied.
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Before upstreaming, replace the environment-backed discovery with a dedicated
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udev/ACPI character-device discovery mechanism and install permissions for
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`/dev/gxfp`.
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