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Skip active recalibration for unreliable devices

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ELAN_CALIBRATION_MAX_DELTA raised to 65535 to prevent the
recalibration state machine from running on devices like 04f3:0c6e
where the 0x01→0x03 status transition is intermittently absent,
causing frequent 'Calibration failed!' session errors. The background
image is still re-captured fresh on each activation — we just skip
the active recalibration handshake.

Also bumps ELAN_CALIBRATION_ATTEMPTS to 100 as a safety net for
devices that do support the full calibration sequence.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
buster_dylan 2026-04-15 00:15:28 +10:00
parent 9b5d717788
commit 1ce6db6e2c
1 changed files with 6 additions and 3 deletions
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9
libfprint/drivers/elan.h
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@ -39,12 +39,15 @@
#define ELAN_MIN_CALIBRATION_FW 0x0138
/* max difference between background image mean and calibration mean
* (the response value of get_calib_mean_cmd)*/
#define ELAN_CALIBRATION_MAX_DELTA 500
* (the response value of get_calib_mean_cmd).
* Set very high to skip active recalibration — background is always
* re-captured at activation, and the recalibration handshake is
* unreliable on some devices (e.g. 04f3:0c6e). */
#define ELAN_CALIBRATION_MAX_DELTA 65535
/* times to retry reading calibration status during one session
* generally prevents calibration from looping indefinitely */
#define ELAN_CALIBRATION_ATTEMPTS 30
#define ELAN_CALIBRATION_ATTEMPTS 100
/* min and max frames in a capture */
#define ELAN_MIN_FRAMES 1