NFC: SHDLC implementation
Most NFC HCI chipsets actually use a simplified HDLC link layer to
carry HCI payloads.
This implementation registers itself as an HCI device on behalf of the
NFC driver.
Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/nfc/shdlc.h b/include/net/nfc/shdlc.h
new file mode 100644
index 0000000..1071987
--- /dev/null
+++ b/include/net/nfc/shdlc.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __NFC_SHDLC_H
+#define __NFC_SHDLC_H
+
+struct nfc_shdlc;
+
+struct nfc_shdlc_ops {
+ int (*open) (struct nfc_shdlc *shdlc);
+ void (*close) (struct nfc_shdlc *shdlc);
+ int (*hci_ready) (struct nfc_shdlc *shdlc);
+ int (*xmit) (struct nfc_shdlc *shdlc, struct sk_buff *skb);
+ int (*start_poll) (struct nfc_shdlc *shdlc, u32 protocols);
+ int (*target_from_gate) (struct nfc_shdlc *shdlc, u8 gate,
+ struct nfc_target *target);
+ int (*complete_target_discovered) (struct nfc_shdlc *shdlc, u8 gate,
+ struct nfc_target *target);
+ int (*data_exchange) (struct nfc_shdlc *shdlc,
+ struct nfc_target *target,
+ struct sk_buff *skb, struct sk_buff **res_skb);
+};
+
+enum shdlc_state {
+ SHDLC_DISCONNECTED = 0,
+ SHDLC_CONNECTING = 1,
+ SHDLC_NEGOCIATING = 2,
+ SHDLC_CONNECTED = 3
+};
+
+struct nfc_shdlc {
+ struct mutex state_mutex;
+ enum shdlc_state state;
+ int hard_fault;
+
+ struct nfc_hci_dev *hdev;
+
+ wait_queue_head_t *connect_wq;
+ int connect_tries;
+ int connect_result;
+ struct timer_list connect_timer;/* aka T3 in spec 10.6.1 */
+
+ u8 w; /* window size */
+ bool srej_support;
+
+ struct timer_list t1_timer; /* send ack timeout */
+ bool t1_active;
+
+ struct timer_list t2_timer; /* guard/retransmit timeout */
+ bool t2_active;
+
+ int ns; /* next seq num for send */
+ int nr; /* next expected seq num for receive */
+ int dnr; /* oldest sent unacked seq num */
+
+ struct sk_buff_head rcv_q;
+
+ struct sk_buff_head send_q;
+ bool rnr; /* other side is not ready to receive */
+
+ struct sk_buff_head ack_pending_q;
+
+ struct workqueue_struct *sm_wq;
+ struct work_struct sm_work;
+
+ struct nfc_shdlc_ops *ops;
+
+ int client_headroom;
+ int client_tailroom;
+
+ void *clientdata;
+};
+
+void nfc_shdlc_recv_frame(struct nfc_shdlc *shdlc, struct sk_buff *skb);
+
+struct nfc_shdlc *nfc_shdlc_allocate(struct nfc_shdlc_ops *ops,
+ struct nfc_hci_init_data *init_data,
+ u32 protocols,
+ int tx_headroom, int tx_tailroom,
+ int max_link_payload, const char *devname);
+
+void nfc_shdlc_free(struct nfc_shdlc *shdlc);
+
+void nfc_shdlc_set_clientdata(struct nfc_shdlc *shdlc, void *clientdata);
+void *nfc_shdlc_get_clientdata(struct nfc_shdlc *shdlc);
+struct nfc_hci_dev *nfc_shdlc_get_hci_dev(struct nfc_shdlc *shdlc);
+
+#endif /* __NFC_SHDLC_H */