NFC: Handle error during NCI data exchange

Add support for NCI Interface Error Notification.
When this notification is received and we're during a
data exchange transaction, indicate an error to the NFC
core layer via the data exchange callback.

Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 24 insertions, 0 deletions

diff --git a/include/net/nfc/nci.h b/include/net/nfc/nci.h
index 2a7fdb265611..2be95e2626c0 100644
--- a/include/net/nfc/nci.h
+++ b/include/net/nfc/nci.h
@@ -260,6 +260,12 @@ struct nci_core_conn_credit_ntf {
         struct conn_credit_entry        conn_entries[NCI_MAX_NUM_CONN];
 } __packed;
 
+#define NCI_OP_CORE_INTF_ERROR_NTF      nci_opcode_pack(NCI_GID_CORE, 0x08)
+struct nci_core_intf_error_ntf {
+        __u8    status;
+        __u8    conn_id;
+} __packed;
+
 #define NCI_OP_RF_INTF_ACTIVATED_NTF    nci_opcode_pack(NCI_GID_RF_MGMT, 0x05)
 struct rf_tech_specific_params_nfca_poll {
         __u16   sens_res;
diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index c8813eda7865..352f7a2321d9 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -71,6 +71,20 @@ static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
                 queue_work(ndev->tx_wq, &ndev->tx_work);
 }
 
+static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
+                                                struct sk_buff *skb)
+{
+        struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
+
+        ntf->conn_id = nci_conn_id(&ntf->conn_id);
+
+        pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
+
+        /* complete the data exchange transaction, if exists */
+        if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
+                nci_data_exchange_complete(ndev, NULL, -EIO);
+}
+
 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 {
@@ -280,6 +294,10 @@ void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
                 nci_core_conn_credits_ntf_packet(ndev, skb);
                 break;
 
+        case NCI_OP_CORE_INTF_ERROR_NTF:
+                nci_core_conn_intf_error_ntf_packet(ndev, skb);
+                break;
+
         case NCI_OP_RF_INTF_ACTIVATED_NTF:
                 nci_rf_intf_activated_ntf_packet(ndev, skb);
                 break;