From 384ab1d174a11292af63674a26eaa99864db9b48 Mon Sep 17 00:00:00 2001 From: "Mark A. Greer" Date: Tue, 23 Sep 2014 16:38:13 -0700 Subject: NFC: digital: Add NFC-DEP Initiator-side ATN Support When an NFC-DEP Initiator times out when waiting for a DEP_RES from the Target, its supposed to send an ATN to the Target. The Target should respond to the ATN with a similar ATN PDU and the Initiator can then resend the last non-ATN PDU that it sent. No more than 'N(retry,atn)' are to be send where 2 <= 'N(retry,atn)' <= 5. If the Initiator had just sent a NACK PDU when the timeout occurred, it is to continue sending NACKs until 'N(retry,nack)' NACKs have been send. This is described in section 14.12.5.6 of the NFC-DEP Digital Protocol Spec. The digital layer's NFC-DEP code doesn't implement this so add that support. The value chosen for 'N(retry,atn)' is 2. Reviewed-by: Thierry Escande Tested-by: Thierry Escande Signed-off-by: Mark A. Greer Signed-off-by: Samuel Ortiz --- include/net/nfc/digital.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/net/nfc') diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h index 7400a8126cd1..0ae101eef0f4 100644 --- a/include/net/nfc/digital.h +++ b/include/net/nfc/digital.h @@ -233,6 +233,7 @@ struct nfc_digital_dev { struct sk_buff *chaining_skb; struct digital_data_exch *data_exch; + int atn_count; int nack_count; struct sk_buff *saved_skb; -- cgit v1.2.3