NFC: Add NCI multiple targets support

Add the ability to select between multiple targets in NCI.
If only one target is found, it will be auto-activated.
If more than one target is found, then DISCOVER_NTF will be
generated for each target, and the host should select one by
calling DISCOVER_SELECT_CMD. Then, the target will be activated.
If the activation fails, GENERIC_ERROR_NTF is generated.

Signed-off-by: Ilan Elias <ilane@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 238 insertions, 85 deletions

diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index 8ec3946..03e7b46 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -71,6 +71,20 @@ static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
 		queue_work(ndev->tx_wq, &ndev->tx_work);
 }
 
+static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
+						struct sk_buff *skb)
+{
+	__u8 status = skb->data[0];
+
+	pr_debug("status 0x%x\n", status);
+
+	if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
+		/* Activation failed, so complete the request
+		(the state remains the same) */
+		nci_req_complete(ndev, status);
+	}
+}
+
 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
 						struct sk_buff *skb)
 {
@@ -86,12 +100,9 @@ static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
 }
 
 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
-			struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
+			struct rf_tech_specific_params_nfca_poll *nfca_poll,
+			__u8 *data)
 {
-	struct rf_tech_specific_params_nfca_poll *nfca_poll;
-
-	nfca_poll = &ntf->rf_tech_specific_params.nfca_poll;
-
 	nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
 	data += 2;
 
@@ -116,12 +127,9 @@ static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
 }
 
 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
-			struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
+			struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
+			__u8 *data)
 {
-	struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
-
-	nfcb_poll = &ntf->rf_tech_specific_params.nfcb_poll;
-
 	nfcb_poll->sensb_res_len = *data++;
 
 	pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
@@ -133,12 +141,9 @@ static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
 }
 
 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
-			struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
+			struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
+			__u8 *data)
 {
-	struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
-
-	nfcf_poll = &ntf->rf_tech_specific_params.nfcf_poll;
-
 	nfcf_poll->bit_rate = *data++;
 	nfcf_poll->sensf_res_len = *data++;
 
@@ -151,6 +156,172 @@ static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
 	return data;
 }
 
+static int nci_add_new_protocol(struct nci_dev *ndev,
+				struct nfc_target *target,
+				__u8 rf_protocol,
+				__u8 rf_tech_and_mode,
+				void *params)
+{
+	struct rf_tech_specific_params_nfca_poll *nfca_poll;
+	struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
+	struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
+	__u32 protocol;
+
+	if (rf_protocol == NCI_RF_PROTOCOL_T2T)
+		protocol = NFC_PROTO_MIFARE_MASK;
+	else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
+		protocol = NFC_PROTO_ISO14443_MASK;
+	else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
+		protocol = NFC_PROTO_FELICA_MASK;
+	else
+		protocol = 0;
+
+	if (!(protocol & ndev->poll_prots)) {
+		pr_err("the target found does not have the desired protocol\n");
+		return -EPROTO;
+	}
+
+	if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
+		nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
+
+		target->sens_res = nfca_poll->sens_res;
+		target->sel_res = nfca_poll->sel_res;
+		target->nfcid1_len = nfca_poll->nfcid1_len;
+		if (target->nfcid1_len > 0) {
+			memcpy(target->nfcid1, nfca_poll->nfcid1,
+				target->nfcid1_len);
+		}
+	} else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
+		nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
+
+		target->sensb_res_len = nfcb_poll->sensb_res_len;
+		if (target->sensb_res_len > 0) {
+			memcpy(target->sensb_res, nfcb_poll->sensb_res,
+				target->sensb_res_len);
+		}
+	} else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
+		nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
+
+		target->sensf_res_len = nfcf_poll->sensf_res_len;
+		if (target->sensf_res_len > 0) {
+			memcpy(target->sensf_res, nfcf_poll->sensf_res,
+				target->sensf_res_len);
+		}
+	} else {
+		pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
+		return -EPROTO;
+	}
+
+	target->supported_protocols |= protocol;
+
+	pr_debug("protocol 0x%x\n", protocol);
+
+	return 0;
+}
+
+static void nci_add_new_target(struct nci_dev *ndev,
+				struct nci_rf_discover_ntf *ntf)
+{
+	struct nfc_target *target;
+	int i, rc;
+
+	for (i = 0; i < ndev->n_targets; i++) {
+		target = &ndev->targets[i];
+		if (target->idx == ntf->rf_discovery_id) {
+			/* This target already exists, add the new protocol */
+			nci_add_new_protocol(ndev, target, ntf->rf_protocol,
+						ntf->rf_tech_and_mode,
+						&ntf->rf_tech_specific_params);
+			return;
+		}
+	}
+
+	/* This is a new target, check if we've enough room */
+	if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
+		pr_debug("not enough room, ignoring new target...\n");
+		return;
+	}
+
+	target = &ndev->targets[ndev->n_targets];
+
+	rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
+					ntf->rf_tech_and_mode,
+					&ntf->rf_tech_specific_params);
+	if (!rc) {
+		target->idx = ntf->rf_discovery_id;
+		ndev->n_targets++;
+
+		pr_debug("target_idx %d, n_targets %d\n", target->idx,
+				ndev->n_targets);
+	}
+}
+
+void nci_clear_target_list(struct nci_dev *ndev)
+{
+	memset(ndev->targets, 0,
+		(sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
+
+	ndev->n_targets = 0;
+}
+
+static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
+					struct sk_buff *skb)
+{
+	struct nci_rf_discover_ntf ntf;
+	__u8 *data = skb->data;
+	bool add_target = true;
+
+	ntf.rf_discovery_id = *data++;
+	ntf.rf_protocol = *data++;
+	ntf.rf_tech_and_mode = *data++;
+	ntf.rf_tech_specific_params_len = *data++;
+
+	pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
+	pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
+	pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
+	pr_debug("rf_tech_specific_params_len %d\n",
+			ntf.rf_tech_specific_params_len);
+
+	if (ntf.rf_tech_specific_params_len > 0) {
+		switch (ntf.rf_tech_and_mode) {
+		case NCI_NFC_A_PASSIVE_POLL_MODE:
+			data = nci_extract_rf_params_nfca_passive_poll(ndev,
+				&(ntf.rf_tech_specific_params.nfca_poll), data);
+			break;
+
+		case NCI_NFC_B_PASSIVE_POLL_MODE:
+			data = nci_extract_rf_params_nfcb_passive_poll(ndev,
+				&(ntf.rf_tech_specific_params.nfcb_poll), data);
+			break;
+
+		case NCI_NFC_F_PASSIVE_POLL_MODE:
+			data = nci_extract_rf_params_nfcf_passive_poll(ndev,
+				&(ntf.rf_tech_specific_params.nfcf_poll), data);
+			break;
+
+		default:
+			pr_err("unsupported rf_tech_and_mode 0x%x\n",
+			       ntf.rf_tech_and_mode);
+			data += ntf.rf_tech_specific_params_len;
+			add_target = false;
+		}
+	}
+
+	ntf.ntf_type = *data++;
+	pr_debug("ntf_type %d\n", ntf.ntf_type);
+
+	if (add_target == true)
+		nci_add_new_target(ndev, &ntf);
+
+	if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
+		atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
+	} else {
+		atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
+		nfc_targets_found(ndev->nfc_dev, ndev->targets,
+					ndev->n_targets);
+	}
+}
+
 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 			struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
 {
@@ -184,74 +355,32 @@ static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
 	default:
 		pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 		       ntf->activation_rf_tech_and_mode);
-		return -EPROTO;
+		return NCI_STATUS_RF_PROTOCOL_ERROR;
 	}
 
-	return 0;
+	return NCI_STATUS_OK;
 }
 
-static void nci_target_found(struct nci_dev *ndev,
-				struct nci_rf_intf_activated_ntf *ntf)
+static void nci_target_auto_activated(struct nci_dev *ndev,
+					struct nci_rf_intf_activated_ntf *ntf)
 {
-	struct nfc_target nfc_tgt;
+	struct nfc_target *target;
+	int rc;
 
-	memset(&nfc_tgt, 0, sizeof(nfc_tgt));
+	target = &ndev->targets[ndev->n_targets];
 
-	if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T)
-		nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK;
-	else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
-		nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK;
-	else if (ntf->rf_protocol == NCI_RF_PROTOCOL_T3T)
-		nfc_tgt.supported_protocols = NFC_PROTO_FELICA_MASK;
-
-	if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) {
-		pr_debug("the target found does not have the desired protocol\n");
+	rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
+					ntf->activation_rf_tech_and_mode,
+					&ntf->rf_tech_specific_params);
+	if (rc)
 		return;
-	}
 
-	pr_debug("new target found,  supported_protocols 0x%x\n",
-		 nfc_tgt.supported_protocols);
-
-	if (ntf->activation_rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
-		nfc_tgt.sens_res =
-			ntf->rf_tech_specific_params.nfca_poll.sens_res;
-		nfc_tgt.sel_res =
-			ntf->rf_tech_specific_params.nfca_poll.sel_res;
-		nfc_tgt.nfcid1_len =
-			ntf->rf_tech_specific_params.nfca_poll.nfcid1_len;
-		if (nfc_tgt.nfcid1_len > 0) {
-			memcpy(nfc_tgt.nfcid1,
-				ntf->rf_tech_specific_params.nfca_poll.nfcid1,
-				nfc_tgt.nfcid1_len);
-		}
-	} else if (ntf->activation_rf_tech_and_mode ==
-						NCI_NFC_B_PASSIVE_POLL_MODE) {
-		nfc_tgt.sensb_res_len =
-			ntf->rf_tech_specific_params.nfcb_poll.sensb_res_len;
-		if (nfc_tgt.sensb_res_len > 0) {
-			memcpy(nfc_tgt.sensb_res,
-			       ntf->rf_tech_specific_params.nfcb_poll.sensb_res,
-			       nfc_tgt.sensb_res_len);
-		}
-	} else if (ntf->activation_rf_tech_and_mode ==
-						NCI_NFC_F_PASSIVE_POLL_MODE) {
-		nfc_tgt.sensf_res_len =
-			ntf->rf_tech_specific_params.nfcf_poll.sensf_res_len;
-		if (nfc_tgt.sensf_res_len > 0) {
-			memcpy(nfc_tgt.sensf_res,
-			       ntf->rf_tech_specific_params.nfcf_poll.sensf_res,
-			       nfc_tgt.sensf_res_len);
-		}
-	}
+	target->idx = ntf->rf_discovery_id;
+	ndev->n_targets++;
 
-	ndev->target_available_prots = nfc_tgt.supported_protocols;
-	ndev->max_data_pkt_payload_size = ntf->max_data_pkt_payload_size;
-	ndev->initial_num_credits = ntf->initial_num_credits;
+	pr_debug("target_idx %d, n_targets %d\n", target->idx, ndev->n_targets);
 
-	/* set the available credits to initial value */
-	atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
-
-	nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1);
+	nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
 }
 
 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
@@ -259,9 +388,7 @@ static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 {
 	struct nci_rf_intf_activated_ntf ntf;
 	__u8 *data = skb->data;
-	int err = 0;
-
-	atomic_set(&ndev->state, NCI_POLL_ACTIVE);
+	int err = NCI_STATUS_OK;
 
 	ntf.rf_discovery_id = *data++;
 	ntf.rf_interface = *data++;
@@ -286,23 +413,24 @@ static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 		switch (ntf.activation_rf_tech_and_mode) {
 		case NCI_NFC_A_PASSIVE_POLL_MODE:
 			data = nci_extract_rf_params_nfca_passive_poll(ndev,
-				&ntf, data);
+				&(ntf.rf_tech_specific_params.nfca_poll), data);
 			break;
 
 		case NCI_NFC_B_PASSIVE_POLL_MODE:
 			data = nci_extract_rf_params_nfcb_passive_poll(ndev,
-				&ntf, data);
+				&(ntf.rf_tech_specific_params.nfcb_poll), data);
 			break;
 
 		case NCI_NFC_F_PASSIVE_POLL_MODE:
 			data = nci_extract_rf_params_nfcf_passive_poll(ndev,
-				&ntf, data);
+				&(ntf.rf_tech_specific_params.nfcf_poll), data);
 			break;
 
 		default:
 			pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
 			       ntf.activation_rf_tech_and_mode);
-			return;
+			err = NCI_STATUS_RF_PROTOCOL_ERROR;
+			goto exit;
 		}
 	}
 
@@ -334,12 +462,30 @@ static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 		default:
 			pr_err("unsupported rf_interface 0x%x\n",
 			       ntf.rf_interface);
-			return;
+			err = NCI_STATUS_RF_PROTOCOL_ERROR;
+			break;
 		}
 	}
 
-	if (!err)
-		nci_target_found(ndev, &ntf);
+exit:
+	if (err == NCI_STATUS_OK) {
+		ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
+		ndev->initial_num_credits = ntf.initial_num_credits;
+
+		/* set the available credits to initial value */
+		atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
+	}
+
+	if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
+		/* A single target was found and activated automatically */
+		atomic_set(&ndev->state, NCI_POLL_ACTIVE);
+		if (err == NCI_STATUS_OK)
+			nci_target_auto_activated(ndev, &ntf);
+	} else {	/* ndev->state == NCI_W4_HOST_SELECT */
+		/* A selected target was activated, so complete the request */
+		atomic_set(&ndev->state, NCI_POLL_ACTIVE);
+		nci_req_complete(ndev, err);
+	}
 }
 
 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
@@ -349,9 +495,6 @@ static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 
 	pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
 
-	atomic_set(&ndev->state, NCI_IDLE);
-	ndev->target_active_prot = 0;
-
 	/* drop tx data queue */
 	skb_queue_purge(&ndev->tx_q);
 
@@ -365,6 +508,8 @@ static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
 	if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
 		nci_data_exchange_complete(ndev, NULL, -EIO);
 
+	nci_clear_target_list(ndev);
+	atomic_set(&ndev->state, NCI_IDLE);
 	nci_req_complete(ndev, NCI_STATUS_OK);
 }
 
@@ -386,10 +531,18 @@ void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
 		nci_core_conn_credits_ntf_packet(ndev, skb);
 		break;
 
+	case NCI_OP_CORE_GENERIC_ERROR_NTF:
+		nci_core_generic_error_ntf_packet(ndev, skb);
+		break;
+
 	case NCI_OP_CORE_INTF_ERROR_NTF:
 		nci_core_conn_intf_error_ntf_packet(ndev, skb);
 		break;
 
+	case NCI_OP_RF_DISCOVER_NTF:
+		nci_rf_discover_ntf_packet(ndev, skb);
+		break;
+
 	case NCI_OP_RF_INTF_ACTIVATED_NTF:
 		nci_rf_intf_activated_ntf_packet(ndev, skb);
 		break;