1 files changed, 119 insertions, 38 deletions

diff --git a/net/nfc/core.c b/net/nfc/core.c
index 9f6ce011d35d..ff749794bc5b 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -29,6 +29,8 @@
 #include <linux/slab.h>
 #include <linux/nfc.h>
 
+#include <net/genetlink.h>
+
 #include "nfc.h"
 
 #define VERSION "0.1"
@@ -121,14 +123,14 @@ error:
  * The device remains polling for targets until a target is found or
  * the nfc_stop_poll function is called.
  */
-int nfc_start_poll(struct nfc_dev *dev, u32 protocols)
+int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
 {
         int rc;
 
-        pr_debug("dev_name=%s protocols=0x%x\n",
-                 dev_name(&dev->dev), protocols);
+        pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
+                 dev_name(&dev->dev), im_protocols, tm_protocols);
 
-        if (!protocols)
+        if (!im_protocols && !tm_protocols)
                 return -EINVAL;
 
         device_lock(&dev->dev);
@@ -143,9 +145,11 @@ int nfc_start_poll(struct nfc_dev *dev, u32 protocols)
                 goto error;
         }
 
-        rc = dev->ops->start_poll(dev, protocols);
-        if (!rc)
+        rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
+        if (!rc) {
                 dev->polling = true;
+                dev->rf_mode = NFC_RF_NONE;
+        }
 
 error:
         device_unlock(&dev->dev);
@@ -235,8 +239,10 @@ int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
         }
 
         rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
-        if (!rc)
+        if (!rc) {
                 dev->active_target = target;
+                dev->rf_mode = NFC_RF_INITIATOR;
+        }
 
 error:
         device_unlock(&dev->dev);
@@ -264,11 +270,6 @@ int nfc_dep_link_down(struct nfc_dev *dev)
                 goto error;
         }
 
-        if (dev->dep_rf_mode == NFC_RF_TARGET) {
-                rc = -EOPNOTSUPP;
-                goto error;
-        }
-
         rc = dev->ops->dep_link_down(dev);
         if (!rc) {
                 dev->dep_link_up = false;
@@ -286,7 +287,6 @@ int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
                        u8 comm_mode, u8 rf_mode)
 {
         dev->dep_link_up = true;
-        dev->dep_rf_mode = rf_mode;
 
         nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
 
@@ -330,6 +330,7 @@ int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
         rc = dev->ops->activate_target(dev, target, protocol);
         if (!rc) {
                 dev->active_target = target;
+                dev->rf_mode = NFC_RF_INITIATOR;
 
                 if (dev->ops->check_presence)
                         mod_timer(&dev->check_pres_timer, jiffies +
@@ -409,27 +410,30 @@ 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);
+                        goto error;
+                }
 
-        if (dev->active_target->idx != target_idx) {
-                rc = -EADDRNOTAVAIL;
+                if (dev->ops->check_presence)
+                        del_timer_sync(&dev->check_pres_timer);
+
+                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;
         }
 
-        if (dev->ops->check_presence)
-                del_timer_sync(&dev->check_pres_timer);
-
-        rc = dev->ops->data_exchange(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));
 
 error:
         device_unlock(&dev->dev);
@@ -447,6 +451,63 @@ int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
 }
 EXPORT_SYMBOL(nfc_set_remote_general_bytes);
 
+u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
+{
+        pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+        return nfc_llcp_general_bytes(dev, 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)
+{
+        int rc;
+
+        device_lock(&dev->dev);
+
+        dev->polling = false;
+
+        if (gb != NULL) {
+                rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
+                if (rc < 0)
+                        goto out;
+        }
+
+        dev->rf_mode = NFC_RF_TARGET;
+
+        if (protocol == NFC_PROTO_NFC_DEP_MASK)
+                nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
+
+        rc = nfc_genl_tm_activated(dev, protocol);
+
+out:
+        device_unlock(&dev->dev);
+
+        return rc;
+}
+EXPORT_SYMBOL(nfc_tm_activated);
+
+int nfc_tm_deactivated(struct nfc_dev *dev)
+{
+        dev->dep_link_up = false;
+
+        return nfc_genl_tm_deactivated(dev);
+}
+EXPORT_SYMBOL(nfc_tm_deactivated);
+
 /**
  * nfc_alloc_send_skb - allocate a skb for data exchange responses
  *
@@ -501,6 +562,8 @@ EXPORT_SYMBOL(nfc_alloc_recv_skb);
  * The device driver must call this function when one or many nfc targets
  * are found. After calling this function, the device driver must stop
  * polling for targets.
+ * NOTE: This function can be called with targets=NULL and n_targets=0 to
+ * notify a driver error, meaning that the polling operation cannot complete.
  * IMPORTANT: this function must not be called from an atomic context.
  * In addition, it must also not be called from a context that would prevent
  * the NFC Core to call other nfc ops entry point concurrently.
@@ -512,23 +575,33 @@ int nfc_targets_found(struct nfc_dev *dev,
 
         pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
 
-        dev->polling = false;
-
         for (i = 0; i < n_targets; i++)
                 targets[i].idx = dev->target_next_idx++;
 
         device_lock(&dev->dev);
 
+        if (dev->polling == false) {
+                device_unlock(&dev->dev);
+                return 0;
+        }
+
+        dev->polling = false;
+
         dev->targets_generation++;
 
         kfree(dev->targets);
-        dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
-                               GFP_ATOMIC);
+        dev->targets = NULL;
 
-        if (!dev->targets) {
-                dev->n_targets = 0;
-                device_unlock(&dev->dev);
-                return -ENOMEM;
+        if (targets) {
+                dev->targets = kmemdup(targets,
+                                       n_targets * sizeof(struct nfc_target),
+                                       GFP_ATOMIC);
+
+                if (!dev->targets) {
+                        dev->n_targets = 0;
+                        device_unlock(&dev->dev);
+                        return -ENOMEM;
+                }
         }
 
         dev->n_targets = n_targets;
@@ -592,6 +665,12 @@ int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
 }
 EXPORT_SYMBOL(nfc_target_lost);
 
+inline void nfc_driver_failure(struct nfc_dev *dev, int err)
+{
+        nfc_targets_found(dev, NULL, 0);
+}
+EXPORT_SYMBOL(nfc_driver_failure);
+
 static void nfc_release(struct device *d)
 {
         struct nfc_dev *dev = to_nfc_dev(d);
@@ -678,7 +757,7 @@ 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)
@@ -847,3 +926,5 @@ MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
 MODULE_DESCRIPTION("NFC Core ver " VERSION);
 MODULE_VERSION(VERSION);
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_NFC);
+MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);