xref: /openbmc/linux/drivers/nfc/st21nfca/st21nfca.h (revision c819e2cf)
1 /*
2  * Copyright (C) 2014  STMicroelectronics SAS. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, see <http://www.gnu.org/licenses/>.
15  */
16 
17 #ifndef __LOCAL_ST21NFCA_H_
18 #define __LOCAL_ST21NFCA_H_
19 
20 #include <net/nfc/hci.h>
21 
22 #include "st21nfca_dep.h"
23 
24 #define HCI_MODE 0
25 
26 /* framing in HCI mode */
27 #define ST21NFCA_SOF_EOF_LEN    2
28 
29 /* Almost every time value is 0 */
30 #define ST21NFCA_HCI_LLC_LEN    1
31 
32 /* Size in worst case :
33  * In normal case CRC len = 2 but byte stuffing
34  * may appear in case one CRC byte = ST21NFCA_SOF_EOF
35  */
36 #define ST21NFCA_HCI_LLC_CRC    4
37 
38 #define ST21NFCA_HCI_LLC_LEN_CRC        (ST21NFCA_SOF_EOF_LEN + \
39 						ST21NFCA_HCI_LLC_LEN + \
40 						ST21NFCA_HCI_LLC_CRC)
41 #define ST21NFCA_HCI_LLC_MIN_SIZE       (1 + ST21NFCA_HCI_LLC_LEN_CRC)
42 
43 /* Worst case when adding byte stuffing between each byte */
44 #define ST21NFCA_HCI_LLC_MAX_PAYLOAD    29
45 #define ST21NFCA_HCI_LLC_MAX_SIZE       (ST21NFCA_HCI_LLC_LEN_CRC + 1 + \
46 					ST21NFCA_HCI_LLC_MAX_PAYLOAD)
47 
48 #define DRIVER_DESC "HCI NFC driver for ST21NFCA"
49 
50 #define ST21NFCA_HCI_MODE 0
51 
52 #define ST21NFCA_NUM_DEVICES 256
53 
54 int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops,
55 		       char *llc_name, int phy_headroom, int phy_tailroom,
56 		       int phy_payload, struct nfc_hci_dev **hdev);
57 void st21nfca_hci_remove(struct nfc_hci_dev *hdev);
58 
59 enum st21nfca_state {
60 	ST21NFCA_ST_COLD,
61 	ST21NFCA_ST_READY,
62 };
63 
64 struct st21nfca_hci_info {
65 	struct nfc_phy_ops *phy_ops;
66 	void *phy_id;
67 
68 	struct nfc_hci_dev *hdev;
69 
70 	enum st21nfca_state state;
71 
72 	struct mutex info_lock;
73 
74 	int async_cb_type;
75 	data_exchange_cb_t async_cb;
76 	void *async_cb_context;
77 
78 	struct st21nfca_dep_info dep_info;
79 };
80 
81 /* Reader RF commands */
82 #define ST21NFCA_WR_XCHG_DATA            0x10
83 
84 #define ST21NFCA_RF_READER_F_GATE               0x14
85 
86 #define ST21NFCA_RF_CARD_F_GATE 0x24
87 
88 #endif /* __LOCAL_ST21NFCA_H_ */
89