NFC: Add target mode activation netlink event

Userspace gets a netlink event upon target mode activation.
The LLCP layer is also signaled when we get an ATR_REQ in order to get
the remote general bytes.

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

3 files changed, 100 insertions, 0 deletions

diff --git a/net/nfc/core.c b/net/nfc/core.c
index c83717bfcb8a..17f147430b7c 100644
--- a/net/nfc/core.c
+++ b/net/nfc/core.c
@@ -455,6 +455,41 @@ u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
 }
 EXPORT_SYMBOL(nfc_get_local_general_bytes);
 
+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;
+        }
+
+        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
  *
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index a18fd56798fc..21eaa9b5c6bf 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -221,6 +221,68 @@ free_msg:
         return -EMSGSIZE;
 }
 
+int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
+{
+        struct sk_buff *msg;
+        void *hdr;
+
+        msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+        if (!msg)
+                return -ENOMEM;
+
+        hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
+                          NFC_EVENT_TM_ACTIVATED);
+        if (!hdr)
+                goto free_msg;
+
+        if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
+                goto nla_put_failure;
+        if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
+                goto nla_put_failure;
+
+        genlmsg_end(msg, hdr);
+
+        genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
+
+        return 0;
+
+nla_put_failure:
+        genlmsg_cancel(msg, hdr);
+free_msg:
+        nlmsg_free(msg);
+        return -EMSGSIZE;
+}
+
+int nfc_genl_tm_deactivated(struct nfc_dev *dev)
+{
+        struct sk_buff *msg;
+        void *hdr;
+
+        msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+        if (!msg)
+                return -ENOMEM;
+
+        hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
+                          NFC_EVENT_TM_DEACTIVATED);
+        if (!hdr)
+                goto free_msg;
+
+        if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
+                goto nla_put_failure;
+
+        genlmsg_end(msg, hdr);
+
+        genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
+
+        return 0;
+
+nla_put_failure:
+        genlmsg_cancel(msg, hdr);
+free_msg:
+        nlmsg_free(msg);
+        return -EMSGSIZE;
+}
+
 int nfc_genl_device_added(struct nfc_dev *dev)
 {
         struct sk_buff *msg;
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
index 7d9708f2a66c..cd9fcbe57464 100644
--- a/net/nfc/nfc.h
+++ b/net/nfc/nfc.h
@@ -128,6 +128,9 @@ int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
                                u8 comm_mode, u8 rf_mode);
 int nfc_genl_dep_link_down_event(struct nfc_dev *dev);
 
+int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol);
+int nfc_genl_tm_deactivated(struct nfc_dev *dev);
+
 struct nfc_dev *nfc_get_device(unsigned int idx);
 
 static inline void nfc_put_device(struct nfc_dev *dev)