NFC: Implement NCI dep_link_up and dep_link_down

During NFC-DEP target activation, store the remote
general bytes to be used later in dep_link_up.
When dep_link_up is called, activate the NFC-DEP target,
and forward the remote general bytes.
When dep_link_down is called, deactivate the target.

Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 55 insertions, 1 deletions

diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c
index f017b781667a..acf9abb7d99b 100644
--- a/net/nfc/nci/core.c
+++ b/net/nfc/nci/core.c
@@ -564,7 +564,7 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev,
 {
         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 
-        pr_debug("target_idx %d\n", target->idx);
+        pr_debug("entry\n");
 
         if (!ndev->target_active_prot) {
                 pr_err("unable to deactivate target, no active target\n");
@@ -579,6 +579,38 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev,
         }
 }
 
+
+static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
+                           __u8 comm_mode, __u8 *gb, size_t gb_len)
+{
+        struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
+        int rc;
+
+        pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
+
+        rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
+        if (rc)
+                return rc;
+
+        rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
+                                          ndev->remote_gb_len);
+        if (!rc)
+                rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
+                                        NFC_RF_INITIATOR);
+
+        return rc;
+}
+
+static int nci_dep_link_down(struct nfc_dev *nfc_dev)
+{
+        pr_debug("entry\n");
+
+        nci_deactivate_target(nfc_dev, NULL);
+
+        return 0;
+}
+
+
 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
                           struct sk_buff *skb,
                           data_exchange_cb_t cb, void *cb_context)
@@ -612,6 +644,8 @@ static struct nfc_ops nci_nfc_ops = {
         .dev_down = nci_dev_down,
         .start_poll = nci_start_poll,
         .stop_poll = nci_stop_poll,
+        .dep_link_up = nci_dep_link_up,
+        .dep_link_down = nci_dep_link_down,
         .activate_target = nci_activate_target,
         .deactivate_target = nci_deactivate_target,
         .im_transceive = nci_transceive,
diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index 6e17661a41a4..b2aa98ef0927 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -176,6 +176,8 @@ static int nci_add_new_protocol(struct nci_dev *ndev,
                         protocol = NFC_PROTO_ISO14443_B_MASK;
         else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
                 protocol = NFC_PROTO_FELICA_MASK;
+        else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
+                protocol = NFC_PROTO_NFC_DEP_MASK;
         else
                 protocol = 0;
 
@@ -505,6 +507,24 @@ exit:
 
                 /* set the available credits to initial value */
                 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
+
+                /* store general bytes to be reported later in dep_link_up */
+                if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
+                        ndev->remote_gb_len = 0;
+
+                        if (ntf.activation_params_len > 0) {
+                                /* ATR_RES general bytes at offset 15 */
+                                ndev->remote_gb_len = min_t(__u8,
+                                        (ntf.activation_params
+                                        .poll_nfc_dep.atr_res_len
+                                        - NFC_ATR_RES_GT_OFFSET),
+                                        NFC_MAX_GT_LEN);
+                                memcpy(ndev->remote_gb,
+                                       (ntf.activation_params.poll_nfc_dep
+                                       .atr_res + NFC_ATR_RES_GT_OFFSET),
+                                       ndev->remote_gb_len);
+                        }
+                }
         }
 
         if (atomic_read(&ndev->state) == NCI_DISCOVERY) {