NFC: mei_phy: Register event callback when enabling the device

The callback registration starts a waiting read, so it needs to be fired
everytime the device is enabled. Otherwise following writes will never get
an answer back.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/mei_phy.c

@@ -64,6 +64,15 @@ int nfc_mei_phy_enable(void *phy_id)
                 return r;
 	}
 
+	r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy);
+	if (r) {
+		pr_err("MEY_PHY: Event cb registration failed\n");
+		mei_cl_disable_device(phy->device);
+		phy->powered = 0;
+
+		return r;
+	}
+
 	phy->powered = 1;
 
 	return 0;

drivers/nfc/microread/mei.c

@@ -43,24 +43,16 @@ static int microread_mei_probe(struct mei_cl_device *device,
 		return -ENOMEM;
 	}
 
-	r = mei_cl_register_event_cb(device, nfc_mei_event_cb, phy);
-	if (r) {
-		pr_err(MICROREAD_DRIVER_NAME ": event cb registration failed\n");
-		goto err_out;
-	}
-
 	r = microread_probe(phy, &mei_phy_ops, LLC_NOP_NAME,
 			    MEI_NFC_HEADER_SIZE, 0, MEI_NFC_MAX_HCI_PAYLOAD,
 			    &phy->hdev);
-	if (r < 0)
-		goto err_out;
-
-	return 0;
+	if (r < 0) {
+		nfc_mei_phy_free(phy);
 
-err_out:
-	nfc_mei_phy_free(phy);
+		return r;
+	}
 
-	return r;
+	return 0;
 }
 
 static int microread_mei_remove(struct mei_cl_device *device)

drivers/nfc/pn544/mei.c

@@ -43,24 +43,16 @@ static int pn544_mei_probe(struct mei_cl_device *device,
 		return -ENOMEM;
 	}
 
-	r = mei_cl_register_event_cb(device, nfc_mei_event_cb, phy);
-	if (r) {
-		pr_err(PN544_DRIVER_NAME ": event cb registration failed\n");
-		goto err_out;
-	}
-
 	r = pn544_hci_probe(phy, &mei_phy_ops, LLC_NOP_NAME,
 			    MEI_NFC_HEADER_SIZE, 0, MEI_NFC_MAX_HCI_PAYLOAD,
 			    &phy->hdev);
-	if (r < 0)
-		goto err_out;
-
-	return 0;
+	if (r < 0) {
+		nfc_mei_phy_free(phy);
 
-err_out:
-	nfc_mei_phy_free(phy);
+		return r;
+	}
 
-	return r;
+	return 0;
 }
 
 static int pn544_mei_remove(struct mei_cl_device *device)