NFC: st21nfca: Adding P2P support to st21nfca in Initiator & Target mode

Support for Initiator and Target mode with ISO18092 commands support:
- ATR_REQ/ATR_RES
- PSL_REQ/PSL_RES
- DEP_REQ/DEP_RES

Work based on net/nfc/digital_dep.c.
st21nfca is using:
- Gate reader F for P2P in initiator mode.
- Gate card F for P2P in target mode.

Felica tag and p2p are differentiated with NFCID2.
When starting with 01FE it is acting in p2p mode.

On complete_target_discovered on ST21NFCA_RF_READER_F_GATE
supported_protocols is set to NFC_PROTO_NFC_DEP_MASK
for P2P.

Tested against: Nexus S, Galaxy S2, Galaxy S3, Galaxy S3 Mini,
Nexus 4 & Nexus 5.
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/st21nfca/Makefile

@@ -4,5 +4,5 @@
 
 st21nfca_i2c-objs  = i2c.o
 
-obj-$(CONFIG_NFC_ST21NFCA)     += st21nfca.o
+obj-$(CONFIG_NFC_ST21NFCA)     += st21nfca.o st21nfca_dep.o
 obj-$(CONFIG_NFC_ST21NFCA_I2C) += st21nfca_i2c.o

drivers/nfc/st21nfca/st21nfca.h

@@ -19,6 +19,8 @@
 
 #include <net/nfc/hci.h>
 
+#include "st21nfca_dep.h"
+
 #define HCI_MODE 0
 
 /* framing in HCI mode */
@@ -73,7 +75,8 @@ struct st21nfca_hci_info {
 	data_exchange_cb_t async_cb;
 	void *async_cb_context;
 
-} __packed;
+	struct st21nfca_dep_info dep_info;
+};
 
 /* Reader RF commands */
 #define ST21NFCA_WR_XCHG_DATA            0x10
@@ -83,5 +86,26 @@ struct st21nfca_hci_info {
 #define ST21NFCA_RF_READER_F_DATARATE_106 0x01
 #define ST21NFCA_RF_READER_F_DATARATE_212 0x02
 #define ST21NFCA_RF_READER_F_DATARATE_424 0x04
+#define ST21NFCA_RF_READER_F_POL_REQ    0x02
+#define ST21NFCA_RF_READER_F_POL_REQ_DEFAULT    0xffff0000
+#define ST21NFCA_RF_READER_F_NFCID2 0x03
+#define ST21NFCA_RF_READER_F_NFCID1 0x04
+#define ST21NFCA_RF_READER_F_SENS_RES 0x05
+
+#define ST21NFCA_RF_CARD_F_GATE 0x24
+#define ST21NFCA_RF_CARD_F_MODE 0x01
+#define ST21NFCA_RF_CARD_F_NFCID2_LIST 0x04
+#define ST21NFCA_RF_CARD_F_NFCID1 0x05
+#define ST21NFCA_RF_CARD_F_SENS_RES 0x06
+#define ST21NFCA_RF_CARD_F_SEL_RES 0x07
+#define ST21NFCA_RF_CARD_F_DATARATE 0x08
+#define ST21NFCA_RF_CARD_F_DATARATE_106 0x00
+#define ST21NFCA_RF_CARD_F_DATARATE_212_424 0x01
+
+#define ST21NFCA_EVT_SEND_DATA 0x10
+#define ST21NFCA_EVT_FIELD_ON 0x11
+#define ST21NFCA_EVT_CARD_DEACTIVATED 0x12
+#define ST21NFCA_EVT_CARD_ACTIVATED 0x13
+#define ST21NFCA_EVT_FIELD_OFF 0x14
 
 #endif /* __LOCAL_ST21NFCA_H_ */

drivers/nfc/st21nfca/st21nfca_dep.h

+/*
+ * Copyright (C) 2014  STMicroelectronics SAS. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ST21NFCA_DEP_H
+#define __ST21NFCA_DEP_H
+
+#include <linux/skbuff.h>
+#include <linux/workqueue.h>
+
+struct st21nfca_dep_info {
+	struct sk_buff *tx_pending;
+	struct work_struct tx_work;
+	u8 curr_nfc_dep_pni;
+	u32 idx;
+	u8 to;
+	u8 did;
+	u8 bsi;
+	u8 bri;
+	u8 lri;
+} __packed;
+
+int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev, struct sk_buff *skb,
+				u8 gate);
+int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb);
+
+int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len);
+int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb);
+void st21nfca_dep_init(struct nfc_hci_dev *hdev);
+void st21nfca_dep_deinit(struct nfc_hci_dev *hdev);
+#endif /* __ST21NFCA_DEP_H */