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Commit 9dbe7763 authored by Christophe Ricard's avatar Christophe Ricard Committed by Samuel Ortiz
Browse files

nfc: st21nfca: Add additional comments about EVT_TRANSACTION 



Add comments about HCI EVT_TRANSACTION in order to make the code
understandable by other readers.

Signed-off-by: default avatarChristophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 1dab57f0

drivers/nfc/st21nfca/st21nfca_se.c

+10 −1
Original line number Diff line number Diff line
@@ -310,6 +310,13 @@ int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host, 
	case ST21NFCA_EVT_CONNECTIVITY:

		break;

	case ST21NFCA_EVT_TRANSACTION:

		/*

		 * According to specification etsi 102 622

		 * 11.2.2.4 EVT_TRANSACTION Table 52

		 * Description	Tag	Length

		 * AID		81	5 to 16

		 * PARAMETERS	82	0 to 255

		 */

		if (skb->len < NFC_MIN_AID_LENGTH + 2 &&

		    skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)

			return -EPROTO;
@@ -318,8 +325,10 @@ int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host, 
						   skb->len - 2, GFP_KERNEL);



		transaction->aid_len = skb->data[1];

		memcpy(transaction->aid, &skb->data[2], skb->data[1]);

		memcpy(transaction->aid, &skb->data[2],

		       transaction->aid_len);



		/* Check next byte is PARAMETERS tag (82) */

		if (skb->data[transaction->aid_len + 2] !=

		    NFC_EVT_TRANSACTION_PARAMS_TAG)

			return -EPROTO;