NFC: digital: Set current target active on activate_target() call

The curr_protocol field of nfc_digital_dev structure used to determine
if a target is currently active was set too soon, immediately when a
target is found. This is not good since there is no other way than
deactivate_target() to reset curr_protocol and if activate_target() is
not called, the target remains active and it's not possible to put the
device in poll mode anymore.

With this patch curr_protocol is set when nfc core activates a target,
puts a device up, or when an ATR_REQ is received in target mode.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 28 insertions, 2 deletions

diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c
index 09fc95439955..c129d1571ca6 100644
--- a/net/nfc/digital_core.c
+++ b/net/nfc/digital_core.c
@@ -339,7 +339,6 @@ int digital_target_found(struct nfc_digital_dev *ddev,
         pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
 
         ddev->curr_rf_tech = rf_tech;
-        ddev->curr_protocol = protocol;
 
         if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
                 ddev->skb_add_crc = digital_skb_add_crc_none;
@@ -541,8 +540,14 @@ static int digital_dep_link_up(struct nfc_dev *nfc_dev,
                                __u8 comm_mode, __u8 *gb, size_t gb_len)
 {
         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
+        int rc;
+
+        rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
 
-        return digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
+        if (!rc)
+                ddev->curr_protocol = NFC_PROTO_NFC_DEP;
+
+        return rc;
 }
 
 static int digital_dep_link_down(struct nfc_dev *nfc_dev)
@@ -557,6 +562,20 @@ static int digital_dep_link_down(struct nfc_dev *nfc_dev)
 static int digital_activate_target(struct nfc_dev *nfc_dev,
                                    struct nfc_target *target, __u32 protocol)
 {
+        struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
+
+        if (ddev->poll_tech_count) {
+                pr_err("Can't activate a target while polling\n");
+                return -EBUSY;
+        }
+
+        if (ddev->curr_protocol) {
+                pr_err("A target is already active\n");
+                return -EBUSY;
+        }
+
+        ddev->curr_protocol = protocol;
+
         return 0;
 }
 
@@ -565,6 +584,11 @@ static void digital_deactivate_target(struct nfc_dev *nfc_dev,
 {
         struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
 
+        if (!ddev->curr_protocol) {
+                pr_err("No active target\n");
+                return;
+        }
+
         ddev->curr_protocol = 0;
 }
 
diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c
index 470a0b4016ed..562bec9ad8d9 100644
--- a/net/nfc/digital_dep.c
+++ b/net/nfc/digital_dep.c
@@ -681,6 +681,8 @@ void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
                 ddev->skb_check_crc = digital_skb_check_crc_none;
         }
 
+        ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK;
+
         rc = ddev->skb_check_crc(resp);
         if (rc) {
                 PROTOCOL_ERR("14.4.1.6");