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device: Add simple temperature model for devices

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This temperature model has three states:
 * COLD
 * WARM
 * HOT

Device drivers can define the time it requires for the device to get HOT
and COLD. The underlying model assumes an exponential warming and
cooling process and enforces a cool-off time after the device has
reached the HOT state. This cool down period is however shorter than the
specified time in the driver.
This commit is contained in:
Benjamin Berg
2021-04-21 17:16:03 +02:00
parent 96e5888110
commit a2d950044d
8 changed files with 243 additions and 0 deletions
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18
libfprint/fp-device.h
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@@ -81,6 +81,23 @@ typedef enum {
FP_SCAN_TYPE_PRESS,
} FpScanType;
/**
* FpTemperature:
* @FP_TEMPERATURE_COLD: Sensor is considered cold.
* @FP_TEMPERATURE_WARM: Sensor is warm, usage time may be limited.
* @FP_TEMPERATURE_HOT: Sensor is hot and cannot be used.
*
* When a device is created, it is assumed to be cold. Applications such as
* fprintd may want to ensure all devices on the system are cold before
* shutting down in order to ensure that the cool-off period is not violated
* because the internal libfprint state about the device is lost.
*/
typedef enum {
FP_TEMPERATURE_COLD,
FP_TEMPERATURE_WARM,
FP_TEMPERATURE_HOT,
} FpTemperature;
/**
* FpDeviceRetry:
* @FP_DEVICE_RETRY_GENERAL: The scan did not succeed due to poor scan quality
@@ -201,6 +218,7 @@ gboolean fp_device_is_open (FpDevice *device);
FpScanType fp_device_get_scan_type (FpDevice *device);
FpFingerStatusFlags fp_device_get_finger_status (FpDevice *device);
gint fp_device_get_nr_enroll_stages (FpDevice *device);
FpTemperature fp_device_get_temperature (FpDevice *device);
FpDeviceFeature fp_device_get_features (FpDevice *device);
gboolean fp_device_has_feature (FpDevice *device,