static int quad8_action_read()

in 104-quad-8.c [331:388]

• 48 lines of code
• 13 McCabe index (conditional complexity)

static int quad8_action_read(struct counter_device *counter,
			     struct counter_count *count,
			     struct counter_synapse *synapse,
			     enum counter_synapse_action *action)
{
	struct quad8 *const priv = counter_priv(counter);
	int err;
	enum counter_function function;
	const size_t signal_a_id = count->synapses[0].signal->id;
	enum counter_count_direction direction;

	/* Handle Index signals */
	if (synapse->signal->id >= 16) {
		if (priv->preset_enable[count->id])
			*action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
		else
			*action = COUNTER_SYNAPSE_ACTION_NONE;

		return 0;
	}

	err = quad8_function_read(counter, count, &function);
	if (err)
		return err;

	/* Default action mode */
	*action = COUNTER_SYNAPSE_ACTION_NONE;

	/* Determine action mode based on current count function mode */
	switch (function) {
	case COUNTER_FUNCTION_PULSE_DIRECTION:
		if (synapse->signal->id == signal_a_id)
			*action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
		return 0;
	case COUNTER_FUNCTION_QUADRATURE_X1_A:
		if (synapse->signal->id == signal_a_id) {
			err = quad8_direction_read(counter, count, &direction);
			if (err)
				return err;

			if (direction == COUNTER_COUNT_DIRECTION_FORWARD)
				*action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
			else
				*action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE;
		}
		return 0;
	case COUNTER_FUNCTION_QUADRATURE_X2_A:
		if (synapse->signal->id == signal_a_id)
			*action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
		return 0;
	case COUNTER_FUNCTION_QUADRATURE_X4:
		*action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
		return 0;
	default:
		/* should never reach this path */
		return -EINVAL;
	}
}