NFC: Introduce target mode tx ops

And rename the initiator mode data exchange ops for consistency sake.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/pn533.c

@@ -1691,7 +1691,7 @@ static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
 	return 0;
 }
 
-static int pn533_data_exchange(struct nfc_dev *nfc_dev,
+static int pn533_transceive(struct nfc_dev *nfc_dev,
 			    struct nfc_target *target, struct sk_buff *skb,
 			    data_exchange_cb_t cb, void *cb_context)
 {
@@ -1853,7 +1853,7 @@ struct nfc_ops pn533_nfc_ops = {
 	.stop_poll = pn533_stop_poll,
 	.activate_target = pn533_activate_target,
 	.deactivate_target = pn533_deactivate_target,
-	.data_exchange = pn533_data_exchange,
+	.im_transceive = pn533_transceive,
 };
 
 static int pn533_probe(struct usb_interface *interface,

include/net/nfc/nfc.h

@@ -63,9 +63,10 @@ struct nfc_ops {
 			       u32 protocol);
 	void (*deactivate_target)(struct nfc_dev *dev,
 				  struct nfc_target *target);
-	int (*data_exchange)(struct nfc_dev *dev, struct nfc_target *target,
+	int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target,
 			     struct sk_buff *skb, data_exchange_cb_t cb,
 			     void *cb_context);
+	int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb);
 	int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
 };
 

net/nfc/core.c

@@ -413,12 +413,7 @@ int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
 		goto error;
 	}
 
-	if (dev->active_target == NULL) {
-		rc = -ENOTCONN;
-		kfree_skb(skb);
-		goto error;
-	}
-
+	if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
 		if (dev->active_target->idx != target_idx) {
 			rc = -EADDRNOTAVAIL;
 			kfree_skb(skb);
@@ -428,12 +423,20 @@ int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
 		if (dev->ops->check_presence)
 			del_timer_sync(&dev->check_pres_timer);
 
-	rc = dev->ops->data_exchange(dev, dev->active_target, skb, cb,
+		rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
 					     cb_context);
 
 		if (!rc && dev->ops->check_presence)
 			mod_timer(&dev->check_pres_timer, jiffies +
 				  msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
+	} else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
+		rc = dev->ops->tm_send(dev, skb);
+	} else {
+		rc = -ENOTCONN;
+		kfree_skb(skb);
+		goto error;
+	}
+
 
 error:
 	device_unlock(&dev->dev);
@@ -727,7 +730,7 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
 	struct nfc_dev *dev;
 
 	if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
-	    !ops->deactivate_target || !ops->data_exchange)
+	    !ops->deactivate_target || !ops->im_transceive)
 		return NULL;
 
 	if (!supported_protocols)

net/nfc/hci/core.c

@@ -512,7 +512,7 @@ static void hci_deactivate_target(struct nfc_dev *nfc_dev,
 {
 }
 
-static int hci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
+static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
 			  struct sk_buff *skb, data_exchange_cb_t cb,
 			  void *cb_context)
 {
@@ -580,7 +580,7 @@ static struct nfc_ops hci_nfc_ops = {
 	.stop_poll = hci_stop_poll,
 	.activate_target = hci_activate_target,
 	.deactivate_target = hci_deactivate_target,
-	.data_exchange = hci_data_exchange,
+	.im_transceive = hci_transceive,
 	.check_presence = hci_check_presence,
 };
 

net/nfc/nci/core.c

@@ -522,7 +522,7 @@ static void nci_deactivate_target(struct nfc_dev *nfc_dev,
 	}
 }
 
-static int nci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
+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)
 {
@@ -557,7 +557,7 @@ static struct nfc_ops nci_nfc_ops = {
 	.stop_poll = nci_stop_poll,
 	.activate_target = nci_activate_target,
 	.deactivate_target = nci_deactivate_target,
-	.data_exchange = nci_data_exchange,
+	.im_transceive = nci_transceive,
 };
 
 /* ---- Interface to NCI drivers ---- */