static ssize_t counter_comp_u32_show()

in counter-sysfs.c [157:202]

• 44 lines of code
• 12 McCabe index (conditional complexity)

static ssize_t counter_comp_u32_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	const struct counter_attribute *const a = to_counter_attribute(attr);
	struct counter_device *const counter = dev_get_drvdata(dev);
	const struct counter_available *const avail = a->comp.priv;
	int err;
	u32 data = 0;

	switch (a->scope) {
	case COUNTER_SCOPE_DEVICE:
		err = a->comp.device_u32_read(counter, &data);
		break;
	case COUNTER_SCOPE_SIGNAL:
		err = a->comp.signal_u32_read(counter, a->parent, &data);
		break;
	case COUNTER_SCOPE_COUNT:
		if (a->comp.type == COUNTER_COMP_SYNAPSE_ACTION)
			err = a->comp.action_read(counter, a->parent,
						  a->comp.priv, &data);
		else
			err = a->comp.count_u32_read(counter, a->parent, &data);
		break;
	default:
		return -EINVAL;
	}
	if (err < 0)
		return err;

	switch (a->comp.type) {
	case COUNTER_COMP_FUNCTION:
		return sysfs_emit(buf, "%s\n", counter_function_str[data]);
	case COUNTER_COMP_SIGNAL_LEVEL:
		return sysfs_emit(buf, "%s\n", counter_signal_value_str[data]);
	case COUNTER_COMP_SYNAPSE_ACTION:
		return sysfs_emit(buf, "%s\n", counter_synapse_action_str[data]);
	case COUNTER_COMP_ENUM:
		return sysfs_emit(buf, "%s\n", avail->strs[data]);
	case COUNTER_COMP_COUNT_DIRECTION:
		return sysfs_emit(buf, "%s\n", counter_count_direction_str[data]);
	case COUNTER_COMP_COUNT_MODE:
		return sysfs_emit(buf, "%s\n", counter_count_mode_str[data]);
	default:
		return sysfs_emit(buf, "%u\n", (unsigned int)data);
	}
}