static int counter_attr_create()

in counter-sysfs.c [427:504]

• 69 lines of code
• 21 McCabe index (conditional complexity)

static int counter_attr_create(struct device *const dev,
			       struct counter_attribute_group *const group,
			       const struct counter_comp *const comp,
			       const enum counter_scope scope,
			       void *const parent)
{
	struct counter_attribute *counter_attr;
	struct device_attribute *dev_attr;

	counter_attr = devm_kzalloc(dev, sizeof(*counter_attr), GFP_KERNEL);
	if (!counter_attr)
		return -ENOMEM;

	/* Configure Counter attribute */
	counter_attr->comp = *comp;
	counter_attr->scope = scope;
	counter_attr->parent = parent;

	/* Configure device attribute */
	dev_attr = &counter_attr->dev_attr;
	sysfs_attr_init(&dev_attr->attr);
	dev_attr->attr.name = comp->name;
	switch (comp->type) {
	case COUNTER_COMP_U8:
	case COUNTER_COMP_BOOL:
		if (comp->device_u8_read) {
			dev_attr->attr.mode |= 0444;
			dev_attr->show = counter_comp_u8_show;
		}
		if (comp->device_u8_write) {
			dev_attr->attr.mode |= 0200;
			dev_attr->store = counter_comp_u8_store;
		}
		break;
	case COUNTER_COMP_SIGNAL_LEVEL:
	case COUNTER_COMP_FUNCTION:
	case COUNTER_COMP_SYNAPSE_ACTION:
	case COUNTER_COMP_ENUM:
	case COUNTER_COMP_COUNT_DIRECTION:
	case COUNTER_COMP_COUNT_MODE:
		if (comp->device_u32_read) {
			dev_attr->attr.mode |= 0444;
			dev_attr->show = counter_comp_u32_show;
		}
		if (comp->device_u32_write) {
			dev_attr->attr.mode |= 0200;
			dev_attr->store = counter_comp_u32_store;
		}
		break;
	case COUNTER_COMP_U64:
		if (comp->device_u64_read) {
			dev_attr->attr.mode |= 0444;
			dev_attr->show = counter_comp_u64_show;
		}
		if (comp->device_u64_write) {
			dev_attr->attr.mode |= 0200;
			dev_attr->store = counter_comp_u64_store;
		}
		break;
	default:
		return -EINVAL;
	}

	/* Store list node */
	list_add(&counter_attr->l, &group->attr_list);
	group->num_attr++;

	/* Create "*_available" attribute if needed */
	switch (comp->type) {
	case COUNTER_COMP_FUNCTION:
	case COUNTER_COMP_SYNAPSE_ACTION:
	case COUNTER_COMP_ENUM:
	case COUNTER_COMP_COUNT_MODE:
		return counter_avail_attr_create(dev, group, comp, parent);
	default:
		return 0;
	}
}