static ssize_t counter_comp_u32_store()

in counter-sysfs.c [219:278]

• 57 lines of code
• 11 McCabe index (conditional complexity)

static ssize_t counter_comp_u32_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t len)
{
	const struct counter_attribute *const a = to_counter_attribute(attr);
	struct counter_device *const counter = dev_get_drvdata(dev);
	struct counter_count *const count = a->parent;
	struct counter_synapse *const synapse = a->comp.priv;
	const struct counter_available *const avail = a->comp.priv;
	int err;
	u32 data = 0;

	switch (a->comp.type) {
	case COUNTER_COMP_FUNCTION:
		err = counter_find_enum(&data, count->functions_list,
					count->num_functions, buf,
					counter_function_str);
		break;
	case COUNTER_COMP_SYNAPSE_ACTION:
		err = counter_find_enum(&data, synapse->actions_list,
					synapse->num_actions, buf,
					counter_synapse_action_str);
		break;
	case COUNTER_COMP_ENUM:
		err = __sysfs_match_string(avail->strs, avail->num_items, buf);
		data = err;
		break;
	case COUNTER_COMP_COUNT_MODE:
		err = counter_find_enum(&data, avail->enums, avail->num_items,
					buf, counter_count_mode_str);
		break;
	default:
		err = kstrtou32(buf, 0, &data);
		break;
	}
	if (err < 0)
		return err;

	switch (a->scope) {
	case COUNTER_SCOPE_DEVICE:
		err = a->comp.device_u32_write(counter, data);
		break;
	case COUNTER_SCOPE_SIGNAL:
		err = a->comp.signal_u32_write(counter, a->parent, data);
		break;
	case COUNTER_SCOPE_COUNT:
		if (a->comp.type == COUNTER_COMP_SYNAPSE_ACTION)
			err = a->comp.action_write(counter, count, synapse,
						   data);
		else
			err = a->comp.count_u32_write(counter, count, data);
		break;
	default:
		return -EINVAL;
	}
	if (err < 0)
		return err;

	return len;
}