static int microread_event_received()

in microread/microread.c [547:625]

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

static int microread_event_received(struct nfc_hci_dev *hdev, u8 pipe,
				     u8 event, struct sk_buff *skb)
{
	int r;
	u8 gate = hdev->pipes[pipe].gate;
	u8 mode;

	pr_info("Microread received event 0x%x to gate 0x%x\n", event, gate);

	switch (event) {
	case MICROREAD_EVT_MREAD_CARD_FOUND:
		microread_target_discovered(hdev, gate, skb);
		return 0;

	case MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_FROM_RF:
		if (skb->len < 1) {
			kfree_skb(skb);
			return -EPROTO;
		}

		if (skb->data[skb->len - 1]) {
			kfree_skb(skb);
			return -EIO;
		}

		skb_trim(skb, skb->len - 1);

		r = nfc_tm_data_received(hdev->ndev, skb);
		break;

	case MICROREAD_EVT_MCARD_FIELD_ON:
	case MICROREAD_EVT_MCARD_FIELD_OFF:
		kfree_skb(skb);
		return 0;

	case MICROREAD_EVT_P2P_TARGET_ACTIVATED:
		r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
				     NFC_COMM_PASSIVE, skb->data,
				     skb->len);

		kfree_skb(skb);
		break;

	case MICROREAD_EVT_MCARD_EXCHANGE:
		if (skb->len < 1) {
			kfree_skb(skb);
			return -EPROTO;
		}

		if (skb->data[skb->len-1]) {
			kfree_skb(skb);
			return -EIO;
		}

		skb_trim(skb, skb->len - 1);

		r = nfc_tm_data_received(hdev->ndev, skb);
		break;

	case MICROREAD_EVT_P2P_TARGET_DEACTIVATED:
		kfree_skb(skb);

		mode = 0xff;
		r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
				      MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
		if (r)
			break;

		r = nfc_hci_send_event(hdev, gate,
				       MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL,
				       0);
		break;

	default:
		return 1;
	}

	return r;
}