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>

include/net/nfc/nci.h

@@ -116,6 +116,11 @@
 #define NCI_DISC_MAP_MODE_POLL					0x01
 #define NCI_DISC_MAP_MODE_LISTEN				0x02
 
+/* NCI Discover Notification Type */
+#define NCI_DISCOVER_NTF_TYPE_LAST				0x00
+#define NCI_DISCOVER_NTF_TYPE_LAST_NFCC				0x01
+#define NCI_DISCOVER_NTF_TYPE_MORE				0x02
+
 /* NCI Deactivation Type */
 #define NCI_DEACTIVATE_TYPE_IDLE_MODE				0x00
 #define NCI_DEACTIVATE_TYPE_SLEEP_MODE				0x01
@@ -207,6 +212,13 @@ struct nci_rf_disc_cmd {
 	struct disc_config		disc_configs[NCI_MAX_NUM_RF_CONFIGS];
 } __packed;
 
+#define NCI_OP_RF_DISCOVER_SELECT_CMD	nci_opcode_pack(NCI_GID_RF_MGMT, 0x04)
+struct nci_rf_discover_select_cmd {
+	__u8	rf_discovery_id;
+	__u8	rf_protocol;
+	__u8	rf_interface;
+} __packed;
+
 #define NCI_OP_RF_DEACTIVATE_CMD	nci_opcode_pack(NCI_GID_RF_MGMT, 0x06)
 struct nci_rf_deactivate_cmd {
 	__u8	type;
@@ -244,6 +256,8 @@ struct nci_core_init_rsp_2 {
 
 #define NCI_OP_RF_DISCOVER_RSP		nci_opcode_pack(NCI_GID_RF_MGMT, 0x03)
 
+#define NCI_OP_RF_DISCOVER_SELECT_RSP	nci_opcode_pack(NCI_GID_RF_MGMT, 0x04)
+
 #define NCI_OP_RF_DEACTIVATE_RSP	nci_opcode_pack(NCI_GID_RF_MGMT, 0x06)
 
 /* --------------------------- */
@@ -260,13 +274,15 @@ struct nci_core_conn_credit_ntf {
 	struct conn_credit_entry	conn_entries[NCI_MAX_NUM_CONN];
 } __packed;
 
+#define NCI_OP_CORE_GENERIC_ERROR_NTF	nci_opcode_pack(NCI_GID_CORE, 0x07)
+
 #define NCI_OP_CORE_INTF_ERROR_NTF	nci_opcode_pack(NCI_GID_CORE, 0x08)
 struct nci_core_intf_error_ntf {
 	__u8	status;
 	__u8	conn_id;
 } __packed;
 
-#define NCI_OP_RF_INTF_ACTIVATED_NTF	nci_opcode_pack(NCI_GID_RF_MGMT, 0x05)
+#define NCI_OP_RF_DISCOVER_NTF		nci_opcode_pack(NCI_GID_RF_MGMT, 0x03)
 struct rf_tech_specific_params_nfca_poll {
 	__u16	sens_res;
 	__u8	nfcid1_len;	/* 0, 4, 7, or 10 Bytes */
@@ -286,6 +302,22 @@ struct rf_tech_specific_params_nfcf_poll {
 	__u8	sensf_res[18];	/* 16 or 18 Bytes */
 } __packed;
 
+struct nci_rf_discover_ntf {
+	__u8	rf_discovery_id;
+	__u8	rf_protocol;
+	__u8	rf_tech_and_mode;
+	__u8	rf_tech_specific_params_len;
+
+	union {
+		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;
+	} rf_tech_specific_params;
+
+	__u8	ntf_type;
+} __packed;
+
+#define NCI_OP_RF_INTF_ACTIVATED_NTF	nci_opcode_pack(NCI_GID_RF_MGMT, 0x05)
 struct activation_params_nfca_poll_iso_dep {
 	__u8	rats_res_len;
 	__u8	rats_res[20];

include/net/nfc/nci_core.h

@@ -46,6 +46,8 @@ enum nci_flag {
 enum nci_state {
 	NCI_IDLE,
 	NCI_DISCOVERY,
+	NCI_W4_ALL_DISCOVERIES,
+	NCI_W4_HOST_SELECT,
 	NCI_POLL_ACTIVE,
 };
 
@@ -53,6 +55,7 @@ enum nci_state {
 #define NCI_RESET_TIMEOUT			5000
 #define NCI_INIT_TIMEOUT			5000
 #define NCI_RF_DISC_TIMEOUT			5000
+#define NCI_RF_DISC_SELECT_TIMEOUT		5000
 #define NCI_RF_DEACTIVATE_TIMEOUT		30000
 #define NCI_CMD_TIMEOUT				5000
 #define NCI_DATA_TIMEOUT			700
@@ -66,6 +69,7 @@ struct nci_ops {
 };
 
 #define NCI_MAX_SUPPORTED_RF_INTERFACES		4
+#define NCI_MAX_DISCOVERED_TARGETS		10
 
 /* NCI Core structures */
 struct nci_dev {
@@ -105,9 +109,11 @@ struct nci_dev {
 	void			*driver_data;
 
 	__u32			poll_prots;
-	__u32			target_available_prots;
 	__u32			target_active_prot;
 
+	struct nfc_target	targets[NCI_MAX_DISCOVERED_TARGETS];
+	int			n_targets;
+
 	/* received during NCI_OP_CORE_RESET_RSP */
 	__u8			nci_ver;
 
@@ -178,6 +184,7 @@ int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload);
 int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb);
 void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb,
 				int err);
+void nci_clear_target_list(struct nci_dev *ndev);
 
 /* ----- NCI requests ----- */
 #define NCI_REQ_DONE		0

net/nfc/nci/core.c

@@ -216,6 +216,39 @@ static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
 		&cmd);
 }
 
+struct nci_rf_discover_select_param {
+	__u8	rf_discovery_id;
+	__u8	rf_protocol;
+};
+
+static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
+{
+	struct nci_rf_discover_select_param *param =
+				(struct nci_rf_discover_select_param *)opt;
+	struct nci_rf_discover_select_cmd cmd;
+
+	cmd.rf_discovery_id = param->rf_discovery_id;
+	cmd.rf_protocol = param->rf_protocol;
+
+	switch (cmd.rf_protocol) {
+	case NCI_RF_PROTOCOL_ISO_DEP:
+		cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
+		break;
+
+	case NCI_RF_PROTOCOL_NFC_DEP:
+		cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
+		break;
+
+	default:
+		cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
+		break;
+	}
+
+	nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
+			sizeof(struct nci_rf_discover_select_cmd),
+			&cmd);
+}
+
 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
 {
 	struct nci_rf_deactivate_cmd cmd;
@@ -264,6 +297,7 @@ static int nci_open_device(struct nci_dev *ndev)
 
 	if (!rc) {
 		set_bit(NCI_UP, &ndev->flags);
+		nci_clear_target_list(ndev);
 		atomic_set(&ndev->state, NCI_IDLE);
 	} else {
 		/* Init failed, cleanup */
@@ -361,7 +395,8 @@ static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 	int rc;
 
-	if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
+	if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
+		(atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
 		pr_err("unable to start poll, since poll is already active\n");
 		return -EBUSY;
 	}
@@ -371,8 +406,9 @@ static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
 		return -EBUSY;
 	}
 
-	if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
-		pr_debug("target is active, implicitly deactivate...\n");
+	if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
+		(atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
+		pr_debug("target active or w4 select, implicitly deactivate\n");
 
 		rc = nci_request(ndev, nci_rf_deactivate_req, 0,
 			msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
@@ -393,7 +429,8 @@ static void nci_stop_poll(struct nfc_dev *nfc_dev)
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
 
-	if (atomic_read(&ndev->state) != NCI_DISCOVERY) {
+	if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
+		(atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
 		pr_err("unable to stop poll, since poll is not active\n");
 		return;
 	}
@@ -406,10 +443,15 @@ static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
 				__u32 protocol)
 {
 	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
+	struct nci_rf_discover_select_param param;
+	struct nfc_target *target = 0;
+	int i;
+	int rc = 0;
 
 	pr_debug("target_idx %d, protocol 0x%x\n", target_idx, protocol);
 
-	if (atomic_read(&ndev->state) != NCI_POLL_ACTIVE) {
+	if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
+		(atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
 		pr_err("there is no available target to activate\n");
 		return -EINVAL;
 	}
@@ -419,16 +461,47 @@ static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
 		return -EBUSY;
 	}
 
-	if (!(ndev->target_available_prots & (1 << protocol))) {
+	for (i = 0; i < ndev->n_targets; i++) {
+		if (ndev->targets[i].idx == target_idx) {
+			target = &ndev->targets[i];
+			break;
+		}
+	}
+
+	if (!target) {
+		pr_err("unable to find the selected target\n");
+		return -EINVAL;
+	}
+
+	if (!(target->supported_protocols & (1 << protocol))) {
 		pr_err("target does not support the requested protocol 0x%x\n",
 		       protocol);
 		return -EINVAL;
 	}
 
+	if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
+		param.rf_discovery_id = target->idx;
+
+		if (protocol == NFC_PROTO_JEWEL)
+			param.rf_protocol = NCI_RF_PROTOCOL_T1T;
+		else if (protocol == NFC_PROTO_MIFARE)
+			param.rf_protocol = NCI_RF_PROTOCOL_T2T;
+		else if (protocol == NFC_PROTO_FELICA)
+			param.rf_protocol = NCI_RF_PROTOCOL_T3T;
+		else if (protocol == NFC_PROTO_ISO14443)
+			param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
+		else
+			param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
+
+		rc = nci_request(ndev, nci_rf_discover_select_req,
+				(unsigned long)&param,
+				msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
+	}
+
+	if (!rc)
 		ndev->target_active_prot = protocol;
-	ndev->target_available_prots = 0;
 
-	return 0;
+	return rc;
 }
 
 static void nci_deactivate_target(struct nfc_dev *nfc_dev, __u32 target_idx)

net/nfc/nci/rsp.c

@@ -142,6 +142,18 @@ static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 	nci_req_complete(ndev, status);
 }
 
+static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
+						struct sk_buff *skb)
+{
+	__u8 status = skb->data[0];
+
+	pr_debug("status 0x%x\n", status);
+
+	/* Complete the request on intf_activated_ntf or generic_error_ntf */
+	if (status != NCI_STATUS_OK)
+		nci_req_complete(ndev, status);
+}
+
 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 					struct sk_buff *skb)
 {
@@ -152,6 +164,7 @@ static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
 	/* If target was active, complete the request only in deactivate_ntf */
 	if ((status != NCI_STATUS_OK) ||
 		(atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
+		nci_clear_target_list(ndev);
 		atomic_set(&ndev->state, NCI_IDLE);
 		nci_req_complete(ndev, status);
 	}
@@ -190,6 +203,10 @@ void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
 		nci_rf_disc_rsp_packet(ndev, skb);
 		break;
 
+	case NCI_OP_RF_DISCOVER_SELECT_RSP:
+		nci_rf_disc_select_rsp_packet(ndev, skb);
+		break;
+
 	case NCI_OP_RF_DEACTIVATE_RSP:
 		nci_rf_deactivate_rsp_packet(ndev, skb);
 		break;