NFC: nci: Support logical connections management

In order to communicate with an NFCEE, we need to open a logical
connection to it, by sending the NCI_OP_CORE_CONN_CREATE_CMD
command to the NFCC. It's left up to the drivers to decide when
to close an already opened logical connection.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 85 insertions, 0 deletions

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index e5fb8c8eed94..2a96ed68c7bb 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -507,6 +507,44 @@ int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
 }
 EXPORT_SYMBOL(nci_nfcee_mode_set);
 
+static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
+{
+        struct nci_core_conn_create_cmd cmd;
+        struct core_conn_create_dest_spec_params *params =
+                                (struct core_conn_create_dest_spec_params *)opt;
+
+        cmd.destination_type = NCI_DESTINATION_NFCEE;
+        cmd.number_destination_params = 1;
+        memcpy(&cmd.params.type, params,
+               sizeof(struct core_conn_create_dest_spec_params));
+        nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD,
+                     sizeof(struct nci_core_conn_create_cmd), &cmd);
+}
+
+int nci_core_conn_create(struct nci_dev *ndev,
+                         struct core_conn_create_dest_spec_params *params)
+{
+        ndev->cur_id = params->value.id;
+        return nci_request(ndev, nci_core_conn_create_req,
+                        (unsigned long)params,
+                        msecs_to_jiffies(NCI_CMD_TIMEOUT));
+}
+EXPORT_SYMBOL(nci_core_conn_create);
+
+static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
+{
+        __u8 conn_id = opt;
+
+        nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
+}
+
+int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
+{
+        return nci_request(ndev, nci_core_conn_close_req, conn_id,
+                                msecs_to_jiffies(NCI_CMD_TIMEOUT));
+}
+EXPORT_SYMBOL(nci_core_conn_close);
+
 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
 {
         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
diff --git a/net/nfc/nci/rsp.c b/net/nfc/nci/rsp.c
index 0a3e98240dd6..31ccf7d05e82 100644
--- a/net/nfc/nci/rsp.c
+++ b/net/nfc/nci/rsp.c
@@ -222,6 +222,45 @@ static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev,
         nci_req_complete(ndev, status);
 }
 
+static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
+                                            struct sk_buff *skb)
+{
+        __u8 status = skb->data[0];
+        struct nci_conn_info *conn_info;
+        struct nci_core_conn_create_rsp *rsp;
+
+        pr_debug("status 0x%x\n", status);
+
+        if (status == NCI_STATUS_OK) {
+                rsp = (struct nci_core_conn_create_rsp *)skb->data;
+                list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
+                        if (conn_info->id == ndev->cur_id)
+                                break;
+                }
+
+                if (!conn_info || conn_info->id != ndev->cur_id) {
+                        status = NCI_STATUS_REJECTED;
+                        goto exit;
+                }
+
+                conn_info->conn_id = rsp->conn_id;
+                conn_info->max_pkt_payload_len = rsp->max_ctrl_pkt_payload_len;
+                atomic_set(&conn_info->credits_cnt, rsp->credits);
+        }
+
+exit:
+        nci_req_complete(ndev, status);
+}
+
+static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
+                                           struct sk_buff *skb)
+{
+        __u8 status = skb->data[0];
+
+        pr_debug("status 0x%x\n", status);
+        nci_req_complete(ndev, status);
+}
+
 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 {
         __u16 rsp_opcode = nci_opcode(skb->data);
@@ -251,6 +290,14 @@ void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
                 nci_core_set_config_rsp_packet(ndev, skb);
                 break;
 
+        case NCI_OP_CORE_CONN_CREATE_RSP:
+                nci_core_conn_create_rsp_packet(ndev, skb);
+                break;
+
+        case NCI_OP_CORE_CONN_CLOSE_RSP:
+                nci_core_conn_close_rsp_packet(ndev, skb);
+                break;
+
         case NCI_OP_RF_DISCOVER_MAP_RSP:
                 nci_rf_disc_map_rsp_packet(ndev, skb);
                 break;