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elan: Simplify elan driver internal state machine

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The elan driver always "deactivates" the device after a cpature run. We
can simplify the while internal state into a single "active" state and
rely on the image device driving this state machine correctly.

i.e.:
 * We start a callibrate/capture/deactivate when we go into the
   AWAIT_FINGER_ON state
 * We only store the fact that we are active and want to deactivate
 * We rely on the image device never going into the AWAIT_FINGER_ON
   state without first waiting for the finger to be off (which implies
   deactivation).
This commit is contained in:
Benjamin Berg
2020-10-14 16:01:59 +02:00
parent 3ee5536a13
commit a748f4d30f
2 changed files with 38 additions and 141 deletions
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7
libfprint/drivers/elan.h
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@@ -70,6 +70,9 @@
#define ELAN_CMD_TIMEOUT 10000
#define ELAN_FINGER_TIMEOUT 200
G_DECLARE_FINAL_TYPE (FpiDeviceElan, fpi_device_elan, FPI, DEVICE_ELAN,
FpImageDevice);
struct elan_cmd
{
unsigned char cmd[ELAN_CMD_LEN];
@@ -218,8 +221,8 @@ static void elan_cmd_done (FpiSsm *ssm);
static void elan_cmd_read (FpiSsm *ssm,
FpDevice *dev);
static void elan_calibrate (FpDevice *dev);
static void elan_capture (FpDevice *dev);
static void elan_calibrate (FpiDeviceElan *self);
static void elan_capture (FpiDeviceElan *self);
static void dev_change_state (FpImageDevice *dev,
FpiImageDeviceState state);