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fpi-ssm: Support named SSMs and use a fallback macro

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Add fpi_ssm_new_full() that allows to pass a name to the state-machine
constructor, not to change all the drivers, provide a fpi_ssm_new() macro
that stringifies the nr_parameters value (usually an enum value) as the name
so that we can use it for better debugging.
This commit is contained in:
Marco Trevisan (Treviño) 2019-12-04 20:03:23 +01:00
parent fe967d0ac2
commit 65828e0e56
3 changed files with 38 additions and 15 deletions
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1
doc/libfprint-sections.txt
View file

@ -211,6 +211,7 @@ fpi_print_bz3_match
FpiSsmCompletedCallback
FpiSsmHandlerCallback
fpi_ssm_new
fpi_ssm_new_full
fpi_ssm_free
fpi_ssm_start
fpi_ssm_start_subsm

41
libfprint/fpi-ssm.c
View file

@ -81,6 +81,7 @@
struct _FpiSsm
{
FpDevice *dev;
const char *name;
FpiSsm *parentsm;
gpointer ssm_data;
GDestroyNotify ssm_data_destroy;
@ -103,13 +104,29 @@ struct _FpiSsm
*
* Allocate a new ssm, with @nr_states states. The @handler callback
* will be called after each state transition.
* This is a macro that calls fpi_ssm_new_full() using the stringified
* version of @nr_states, so will work better with named parameters.
*
* Returns: a new #FpiSsm state machine
*/
/**
* fpi_ssm_new_full:
* @dev: a #fp_dev fingerprint device
* @handler: the callback function
* @nr_states: the number of states
* @name: the name of the state machine (for debug purposes)
*
* Allocate a new ssm, with @nr_states states. The @handler callback
* will be called after each state transition.
*
* Returns: a new #FpiSsm state machine
*/
FpiSsm *
fpi_ssm_new (FpDevice *dev,
fpi_ssm_new_full (FpDevice *dev,
FpiSsmHandlerCallback handler,
int nr_states)
int nr_states,
const char *name)
{
FpiSsm *machine;
@ -120,6 +137,7 @@ fpi_ssm_new (FpDevice *dev,
machine->handler = handler;
machine->nr_states = nr_states;
machine->dev = dev;
machine->name = g_strdup (name);
machine->completed = TRUE;
return machine;
}
@ -251,6 +269,7 @@ fpi_ssm_free (FpiSsm *machine)
if (machine->ssm_data_destroy)
g_clear_pointer (&machine->ssm_data, machine->ssm_data_destroy);
g_clear_pointer (&machine->error, g_error_free);
g_clear_pointer (&machine->name, g_free);
fpi_ssm_clear_delayed_action (machine);
g_free (machine);
}
@ -259,7 +278,7 @@ fpi_ssm_free (FpiSsm *machine)
static void
__ssm_call_handler (FpiSsm *machine)
{
fp_dbg ("%p entering state %d", machine, machine->cur_state);
fp_dbg ("%s entering state %d", machine->name, machine->cur_state);
machine->handler (machine, machine->dev);
}
@ -337,9 +356,9 @@ fpi_ssm_mark_completed (FpiSsm *machine)
machine->completed = TRUE;
if (machine->error)
fp_dbg ("%p completed with error: %s", machine, machine->error->message);
fp_dbg ("%s completed with error: %s", machine->name, machine->error->message);
else
fp_dbg ("%p completed successfully", machine);
fp_dbg ("%s completed successfully", machine->name);
if (machine->callback)
{
GError *error = machine->error ? g_error_copy (machine->error) : NULL;
@ -383,9 +402,9 @@ fpi_ssm_mark_completed_delayed (FpiSsm *machine,
on_device_timeout_complete, cancellable,
machine, NULL);
source_name = g_strdup_printf ("[%s] ssm %p complete %d",
source_name = g_strdup_printf ("[%s] ssm %s complete %d",
fp_device_get_device_id (machine->dev),
machine, machine->cur_state + 1);
machine->name, machine->cur_state + 1);
g_source_set_name (machine->timeout, source_name);
}
@ -482,9 +501,9 @@ fpi_ssm_next_state_delayed (FpiSsm *machine,
on_device_timeout_next_state, cancellable,
machine, NULL);
source_name = g_strdup_printf ("[%s] ssm %p jump to next state %d",
source_name = g_strdup_printf ("[%s] ssm %s jump to next state %d",
fp_device_get_device_id (machine->dev),
machine, machine->cur_state + 1);
machine->name, machine->cur_state + 1);
g_source_set_name (machine->timeout, source_name);
}
@ -559,9 +578,9 @@ fpi_ssm_jump_to_state_delayed (FpiSsm *machine,
on_device_timeout_jump_to_state,
cancellable, data, g_free);
source_name = g_strdup_printf ("[%s] ssm %p jump to state %d",
source_name = g_strdup_printf ("[%s] ssm %s jump to state %d",
fp_device_get_device_id (machine->dev),
machine, state);
machine->name, state);
g_source_set_name (machine->timeout, source_name);
}

7
libfprint/fpi-ssm.h
View file

@ -60,9 +60,12 @@ typedef void (*FpiSsmHandlerCallback)(FpiSsm *ssm,
FpDevice *dev);
/* for library and drivers */
FpiSsm *fpi_ssm_new (FpDevice *dev,
#define fpi_ssm_new(dev, handler, nr_states) \
fpi_ssm_new_full (dev, handler, nr_states, #nr_states)
FpiSsm *fpi_ssm_new_full (FpDevice *dev,
FpiSsmHandlerCallback handler,
int nr_states);
int nr_states,
const char *machine_name);
void fpi_ssm_free (FpiSsm *machine);
void fpi_ssm_start (FpiSsm *ssm,
FpiSsmCompletedCallback callback);