nfc: nci: Add nci_nfcc_loopback to the nci core

For test purpose, provide the generic nci loopback function.

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

1 files changed, 77 insertions, 0 deletions

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index 74f2d54df4fc..61fff422424f 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -400,6 +400,83 @@ int nci_core_init(struct nci_dev *ndev)
 }
 EXPORT_SYMBOL(nci_core_init);
 
+struct nci_loopback_data {
+        u8 conn_id;
+        struct sk_buff *data;
+};
+
+static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
+{
+        struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
+
+        nci_send_data(ndev, data->conn_id, data->data);
+}
+
+static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
+{
+        struct nci_dev *ndev = (struct nci_dev *)context;
+        struct nci_conn_info    *conn_info;
+
+        conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
+        if (!conn_info) {
+                nci_req_complete(ndev, NCI_STATUS_REJECTED);
+                return;
+        }
+
+        conn_info->rx_skb = skb;
+
+        nci_req_complete(ndev, NCI_STATUS_OK);
+}
+
+int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
+                      struct sk_buff **resp)
+{
+        int r;
+        struct nci_loopback_data loopback_data;
+        struct nci_conn_info *conn_info;
+        struct sk_buff *skb;
+        int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
+                                        NCI_DESTINATION_NFCC_LOOPBACK, NULL);
+
+        if (conn_id < 0) {
+                r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
+                                         0, 0, NULL);
+                if (r != NCI_STATUS_OK)
+                        return r;
+
+                conn_id = nci_get_conn_info_by_dest_type_params(ndev,
+                                        NCI_DESTINATION_NFCC_LOOPBACK,
+                                        NULL);
+        }
+
+        conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
+        if (!conn_info)
+                return -EPROTO;
+
+        /* store cb and context to be used on receiving data */
+        conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
+        conn_info->data_exchange_cb_context = ndev;
+
+        skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
+        if (!skb)
+                return -ENOMEM;
+
+        skb_reserve(skb, NCI_DATA_HDR_SIZE);
+        memcpy(skb_put(skb, data_len), data, data_len);
+
+        loopback_data.conn_id = conn_id;
+        loopback_data.data = skb;
+
+        ndev->cur_conn_id = conn_id;
+        r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data,
+                        msecs_to_jiffies(NCI_DATA_TIMEOUT));
+        if (r == NCI_STATUS_OK && resp)
+                *resp = conn_info->rx_skb;
+
+        return r;
+}
+EXPORT_SYMBOL(nci_nfcc_loopback);
+
 static int nci_open_device(struct nci_dev *ndev)
 {
         int rc = 0;