NFC: Introduce target mode rx data callback

This routine will be called by drivers whenever they receive data in target
mode. This should be unexpected events and as such should be handled by a
standalone API (i.e. not as a callback pointer from an existing API).

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 34 insertions, 0 deletions

diff --git a/net/nfc/core.c b/net/nfc/core.c
index 76c1e207d29..6a3799eebc3 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -462,6 +462,18 @@ u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
 }
 EXPORT_SYMBOL(nfc_get_local_general_bytes);
 
+int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
+{
+        /* Only LLCP target mode for now */
+        if (dev->dep_link_up == false) {
+                kfree_skb(skb);
+                return -ENOLINK;
+        }
+
+        return nfc_llcp_data_received(dev, skb);
+}
+EXPORT_SYMBOL(nfc_tm_data_received);
+
 int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
                      u8 *gb, size_t gb_len)
 {
diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
index 5f7aa3f632f..5705e6dffb3 100644
--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -937,6 +937,21 @@ void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
         return;
 }
 
+int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
+{
+        struct nfc_llcp_local *local;
+
+        local = nfc_llcp_find_local(dev);
+        if (local == NULL)
+                return -ENODEV;
+
+        local->rx_pending = skb_get(skb);
+        del_timer(&local->link_timer);
+        queue_work(local->rx_wq, &local->rx_work);
+
+        return 0;
+}
+
 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
 {
         struct nfc_llcp_local *local;
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index cd9fcbe5746..c5e42b79a41 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -55,6 +55,7 @@ int nfc_llcp_register_device(struct nfc_dev *dev);
 void nfc_llcp_unregister_device(struct nfc_dev *dev);
 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len);
 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len);
+int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb);
 int __init nfc_llcp_init(void);
 void nfc_llcp_exit(void);
 
@@ -90,6 +91,12 @@ static inline u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *gb_len)
         return NULL;
 }
 
+static inline int nfc_llcp_data_received(struct nfc_dev *dev,
+                                         struct sk_buff *skb)
+{
+        return 0;
+}
+
 static inline int nfc_llcp_init(void)
 {
         return 0;