xref: /openbmc/linux/include/net/nfc/nci_core.h (revision 2010776f)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  *  The NFC Controller Interface is the communication protocol between an
4  *  NFC Controller (NFCC) and a Device Host (DH).
5  *
6  *  Copyright (C) 2011 Texas Instruments, Inc.
7  *  Copyright (C) 2013 Intel Corporation. All rights reserved.
8  *  Copyright (C) 2014 Marvell International Ltd.
9  *
10  *  Written by Ilan Elias <ilane@ti.com>
11  *
12  *  Acknowledgements:
13  *  This file is based on hci_core.h, which was written
14  *  by Maxim Krasnyansky.
15  */
16 
17 #ifndef __NCI_CORE_H
18 #define __NCI_CORE_H
19 
20 #include <linux/interrupt.h>
21 #include <linux/skbuff.h>
22 #include <linux/tty.h>
23 
24 #include <net/nfc/nfc.h>
25 #include <net/nfc/nci.h>
26 
27 /* NCI device flags */
28 enum nci_flag {
29 	NCI_INIT,
30 	NCI_UP,
31 	NCI_DATA_EXCHANGE,
32 	NCI_DATA_EXCHANGE_TO,
33 };
34 
35 /* NCI device states */
36 enum nci_state {
37 	NCI_IDLE,
38 	NCI_DISCOVERY,
39 	NCI_W4_ALL_DISCOVERIES,
40 	NCI_W4_HOST_SELECT,
41 	NCI_POLL_ACTIVE,
42 	NCI_LISTEN_ACTIVE,
43 	NCI_LISTEN_SLEEP,
44 };
45 
46 /* NCI timeouts */
47 #define NCI_RESET_TIMEOUT			5000
48 #define NCI_INIT_TIMEOUT			5000
49 #define NCI_SET_CONFIG_TIMEOUT			5000
50 #define NCI_RF_DISC_TIMEOUT			5000
51 #define NCI_RF_DISC_SELECT_TIMEOUT		5000
52 #define NCI_RF_DEACTIVATE_TIMEOUT		30000
53 #define NCI_CMD_TIMEOUT				5000
54 #define NCI_DATA_TIMEOUT			700
55 
56 struct nci_dev;
57 
58 struct nci_driver_ops {
59 	__u16 opcode;
60 	int (*rsp)(struct nci_dev *dev, struct sk_buff *skb);
61 	int (*ntf)(struct nci_dev *dev, struct sk_buff *skb);
62 };
63 
64 struct nci_ops {
65 	int   (*init)(struct nci_dev *ndev);
66 	int   (*open)(struct nci_dev *ndev);
67 	int   (*close)(struct nci_dev *ndev);
68 	int   (*send)(struct nci_dev *ndev, struct sk_buff *skb);
69 	int   (*setup)(struct nci_dev *ndev);
70 	int   (*post_setup)(struct nci_dev *ndev);
71 	int   (*fw_download)(struct nci_dev *ndev, const char *firmware_name);
72 	__u32 (*get_rfprotocol)(struct nci_dev *ndev, __u8 rf_protocol);
73 	int   (*discover_se)(struct nci_dev *ndev);
74 	int   (*disable_se)(struct nci_dev *ndev, u32 se_idx);
75 	int   (*enable_se)(struct nci_dev *ndev, u32 se_idx);
76 	int   (*se_io)(struct nci_dev *ndev, u32 se_idx,
77 				u8 *apdu, size_t apdu_length,
78 				se_io_cb_t cb, void *cb_context);
79 	int   (*hci_load_session)(struct nci_dev *ndev);
80 	void  (*hci_event_received)(struct nci_dev *ndev, u8 pipe, u8 event,
81 				    struct sk_buff *skb);
82 	void  (*hci_cmd_received)(struct nci_dev *ndev, u8 pipe, u8 cmd,
83 				  struct sk_buff *skb);
84 
85 	const struct nci_driver_ops *prop_ops;
86 	size_t n_prop_ops;
87 
88 	const struct nci_driver_ops *core_ops;
89 	size_t n_core_ops;
90 };
91 
92 #define NCI_MAX_SUPPORTED_RF_INTERFACES		4
93 #define NCI_MAX_DISCOVERED_TARGETS		10
94 #define NCI_MAX_NUM_NFCEE   255
95 #define NCI_MAX_CONN_ID		7
96 #define NCI_MAX_PROPRIETARY_CMD 64
97 
98 struct nci_conn_info {
99 	struct list_head list;
100 	/* NCI specification 4.4.2 Connection Creation
101 	 * The combination of destination type and destination specific
102 	 * parameters shall uniquely identify a single destination for the
103 	 * Logical Connection
104 	 */
105 	struct dest_spec_params *dest_params;
106 	__u8	dest_type;
107 	__u8	conn_id;
108 	__u8	max_pkt_payload_len;
109 
110 	atomic_t credits_cnt;
111 	__u8	 initial_num_credits;
112 
113 	data_exchange_cb_t	data_exchange_cb;
114 	void *data_exchange_cb_context;
115 
116 	struct sk_buff *rx_skb;
117 };
118 
119 #define NCI_INVALID_CONN_ID 0x80
120 
121 #define NCI_HCI_ANY_OPEN_PIPE      0x03
122 
123 /* Gates */
124 #define NCI_HCI_ADMIN_GATE         0x00
125 #define NCI_HCI_LOOPBACK_GATE	   0x04
126 #define NCI_HCI_IDENTITY_MGMT_GATE 0x05
127 #define NCI_HCI_LINK_MGMT_GATE     0x06
128 
129 /* Pipes */
130 #define NCI_HCI_LINK_MGMT_PIPE             0x00
131 #define NCI_HCI_ADMIN_PIPE                 0x01
132 
133 /* Generic responses */
134 #define NCI_HCI_ANY_OK                     0x00
135 #define NCI_HCI_ANY_E_NOT_CONNECTED        0x01
136 #define NCI_HCI_ANY_E_CMD_PAR_UNKNOWN      0x02
137 #define NCI_HCI_ANY_E_NOK                  0x03
138 #define NCI_HCI_ANY_E_PIPES_FULL           0x04
139 #define NCI_HCI_ANY_E_REG_PAR_UNKNOWN      0x05
140 #define NCI_HCI_ANY_E_PIPE_NOT_OPENED      0x06
141 #define NCI_HCI_ANY_E_CMD_NOT_SUPPORTED    0x07
142 #define NCI_HCI_ANY_E_INHIBITED            0x08
143 #define NCI_HCI_ANY_E_TIMEOUT              0x09
144 #define NCI_HCI_ANY_E_REG_ACCESS_DENIED    0x0a
145 #define NCI_HCI_ANY_E_PIPE_ACCESS_DENIED   0x0b
146 
147 #define NCI_HCI_DO_NOT_OPEN_PIPE           0x81
148 #define NCI_HCI_INVALID_PIPE               0x80
149 #define NCI_HCI_INVALID_GATE               0xFF
150 #define NCI_HCI_INVALID_HOST               0x80
151 
152 #define NCI_HCI_MAX_CUSTOM_GATES   50
153 /*
154  * According to specification 102 622 chapter 4.4 Pipes,
155  * the pipe identifier is 7 bits long.
156  */
157 #define NCI_HCI_MAX_PIPES          128
158 
159 struct nci_hci_gate {
160 	u8 gate;
161 	u8 pipe;
162 	u8 dest_host;
163 } __packed;
164 
165 struct nci_hci_pipe {
166 	u8 gate;
167 	u8 host;
168 } __packed;
169 
170 struct nci_hci_init_data {
171 	u8 gate_count;
172 	struct nci_hci_gate gates[NCI_HCI_MAX_CUSTOM_GATES];
173 	char session_id[9];
174 };
175 
176 #define NCI_HCI_MAX_GATES          256
177 
178 struct nci_hci_dev {
179 	u8 nfcee_id;
180 	struct nci_dev *ndev;
181 	struct nci_conn_info *conn_info;
182 
183 	struct nci_hci_init_data init_data;
184 	struct nci_hci_pipe pipes[NCI_HCI_MAX_PIPES];
185 	u8 gate2pipe[NCI_HCI_MAX_GATES];
186 	int expected_pipes;
187 	int count_pipes;
188 
189 	struct sk_buff_head rx_hcp_frags;
190 	struct work_struct msg_rx_work;
191 	struct sk_buff_head msg_rx_queue;
192 };
193 
194 /* NCI Core structures */
195 struct nci_dev {
196 	struct nfc_dev		*nfc_dev;
197 	const struct nci_ops	*ops;
198 	struct nci_hci_dev	*hci_dev;
199 
200 	int			tx_headroom;
201 	int			tx_tailroom;
202 
203 	atomic_t		state;
204 	unsigned long		flags;
205 
206 	atomic_t		cmd_cnt;
207 	__u8			cur_conn_id;
208 
209 	struct list_head	conn_info_list;
210 	struct nci_conn_info	*rf_conn_info;
211 
212 	struct timer_list	cmd_timer;
213 	struct timer_list	data_timer;
214 
215 	struct workqueue_struct	*cmd_wq;
216 	struct work_struct	cmd_work;
217 
218 	struct workqueue_struct	*rx_wq;
219 	struct work_struct	rx_work;
220 
221 	struct workqueue_struct	*tx_wq;
222 	struct work_struct	tx_work;
223 
224 	struct sk_buff_head	cmd_q;
225 	struct sk_buff_head	rx_q;
226 	struct sk_buff_head	tx_q;
227 
228 	struct mutex		req_lock;
229 	struct completion	req_completion;
230 	__u32			req_status;
231 	__u32			req_result;
232 
233 	void			*driver_data;
234 
235 	__u32			poll_prots;
236 	__u32			target_active_prot;
237 
238 	struct nfc_target	targets[NCI_MAX_DISCOVERED_TARGETS];
239 	int			n_targets;
240 
241 	/* received during NCI_OP_CORE_RESET_RSP */
242 	__u8			nci_ver;
243 
244 	/* received during NCI_OP_CORE_INIT_RSP */
245 	__u32			nfcc_features;
246 	__u8			num_supported_rf_interfaces;
247 	__u8			supported_rf_interfaces
248 				[NCI_MAX_SUPPORTED_RF_INTERFACES];
249 	__u8			max_logical_connections;
250 	__u16			max_routing_table_size;
251 	__u8			max_ctrl_pkt_payload_len;
252 	__u16			max_size_for_large_params;
253 	__u8			manufact_id;
254 	__u32			manufact_specific_info;
255 
256 	/* Save RF Discovery ID or NFCEE ID under conn_create */
257 	struct dest_spec_params cur_params;
258 	/* Save destination type under conn_create */
259 	__u8			cur_dest_type;
260 
261 	/* stored during nci_data_exchange */
262 	struct sk_buff		*rx_data_reassembly;
263 
264 	/* stored during intf_activated_ntf */
265 	__u8 remote_gb[NFC_MAX_GT_LEN];
266 	__u8 remote_gb_len;
267 };
268 
269 /* ----- NCI Devices ----- */
270 struct nci_dev *nci_allocate_device(const struct nci_ops *ops,
271 				    __u32 supported_protocols,
272 				    int tx_headroom,
273 				    int tx_tailroom);
274 void nci_free_device(struct nci_dev *ndev);
275 int nci_register_device(struct nci_dev *ndev);
276 void nci_unregister_device(struct nci_dev *ndev);
277 int nci_request(struct nci_dev *ndev,
278 		void (*req)(struct nci_dev *ndev,
279 			    const void *opt),
280 		const void *opt, __u32 timeout);
281 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len,
282 		 const __u8 *payload);
283 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
284 		 const __u8 *payload);
285 int nci_core_reset(struct nci_dev *ndev);
286 int nci_core_init(struct nci_dev *ndev);
287 
288 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb);
289 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb);
290 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val);
291 
292 int nci_nfcee_discover(struct nci_dev *ndev, u8 action);
293 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode);
294 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
295 			 u8 number_destination_params,
296 			 size_t params_len,
297 			 const struct core_conn_create_dest_spec_params *params);
298 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id);
299 int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len,
300 		      struct sk_buff **resp);
301 
302 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev);
303 void nci_hci_deallocate(struct nci_dev *ndev);
304 int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
305 		       const u8 *param, size_t param_len);
306 int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate,
307 		     u8 cmd, const u8 *param, size_t param_len,
308 		     struct sk_buff **skb);
309 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe);
310 int nci_hci_connect_gate(struct nci_dev *ndev, u8 dest_host,
311 			 u8 dest_gate, u8 pipe);
312 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
313 		      const u8 *param, size_t param_len);
314 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
315 		      struct sk_buff **skb);
316 int nci_hci_clear_all_pipes(struct nci_dev *ndev);
317 int nci_hci_dev_session_init(struct nci_dev *ndev);
318 
319 static inline struct sk_buff *nci_skb_alloc(struct nci_dev *ndev,
320 					    unsigned int len,
321 					    gfp_t how)
322 {
323 	struct sk_buff *skb;
324 
325 	skb = alloc_skb(len + ndev->tx_headroom + ndev->tx_tailroom, how);
326 	if (skb)
327 		skb_reserve(skb, ndev->tx_headroom);
328 
329 	return skb;
330 }
331 
332 static inline void nci_set_parent_dev(struct nci_dev *ndev, struct device *dev)
333 {
334 	nfc_set_parent_dev(ndev->nfc_dev, dev);
335 }
336 
337 static inline void nci_set_drvdata(struct nci_dev *ndev, void *data)
338 {
339 	ndev->driver_data = data;
340 }
341 
342 static inline void *nci_get_drvdata(struct nci_dev *ndev)
343 {
344 	return ndev->driver_data;
345 }
346 
347 static inline int nci_set_vendor_cmds(struct nci_dev *ndev,
348 				      const struct nfc_vendor_cmd *cmds,
349 				      int n_cmds)
350 {
351 	return nfc_set_vendor_cmds(ndev->nfc_dev, cmds, n_cmds);
352 }
353 
354 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb);
355 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb);
356 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
357 			struct sk_buff *skb);
358 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
359 			struct sk_buff *skb);
360 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
361 			struct sk_buff *skb);
362 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
363 			struct sk_buff *skb);
364 void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb);
365 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, const void *payload);
366 int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb);
367 int nci_conn_max_data_pkt_payload_size(struct nci_dev *ndev, __u8 conn_id);
368 void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb,
369 				__u8 conn_id, int err);
370 void nci_hci_data_received_cb(void *context, struct sk_buff *skb, int err);
371 
372 void nci_clear_target_list(struct nci_dev *ndev);
373 
374 /* ----- NCI requests ----- */
375 #define NCI_REQ_DONE		0
376 #define NCI_REQ_PEND		1
377 #define NCI_REQ_CANCELED	2
378 
379 void nci_req_complete(struct nci_dev *ndev, int result);
380 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
381 						   int conn_id);
382 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
383 					  const struct dest_spec_params *params);
384 
385 /* ----- NCI status code ----- */
386 int nci_to_errno(__u8 code);
387 
388 /* ----- NCI over SPI acknowledge modes ----- */
389 #define NCI_SPI_CRC_DISABLED	0x00
390 #define NCI_SPI_CRC_ENABLED	0x01
391 
392 /* ----- NCI SPI structures ----- */
393 struct nci_spi {
394 	struct nci_dev		*ndev;
395 	struct spi_device	*spi;
396 
397 	unsigned int		xfer_udelay;	/* microseconds delay between
398 						  transactions */
399 
400 	unsigned int		xfer_speed_hz; /*
401 						* SPI clock frequency
402 						* 0 => default clock
403 						*/
404 
405 	u8			acknowledge_mode;
406 
407 	struct completion	req_completion;
408 	u8			req_result;
409 };
410 
411 /* ----- NCI SPI ----- */
412 struct nci_spi *nci_spi_allocate_spi(struct spi_device *spi,
413 				     u8 acknowledge_mode, unsigned int delay,
414 				     struct nci_dev *ndev);
415 int nci_spi_send(struct nci_spi *nspi,
416 		 struct completion *write_handshake_completion,
417 		 struct sk_buff *skb);
418 struct sk_buff *nci_spi_read(struct nci_spi *nspi);
419 
420 /* ----- NCI UART ---- */
421 
422 /* Ioctl */
423 #define NCIUARTSETDRIVER	_IOW('U', 0, char *)
424 
425 enum nci_uart_driver {
426 	NCI_UART_DRIVER_MARVELL = 0,
427 	NCI_UART_DRIVER_MAX
428 };
429 
430 struct nci_uart;
431 
432 struct nci_uart_ops {
433 	int (*open)(struct nci_uart *nci_uart);
434 	void (*close)(struct nci_uart *nci_uart);
435 	int (*recv)(struct nci_uart *nci_uart, struct sk_buff *skb);
436 	int (*send)(struct nci_uart *nci_uart, struct sk_buff *skb);
437 	void (*tx_start)(struct nci_uart *nci_uart);
438 	void (*tx_done)(struct nci_uart *nci_uart);
439 };
440 
441 struct nci_uart {
442 	struct module		*owner;
443 	struct nci_uart_ops	ops;
444 	const char		*name;
445 	enum nci_uart_driver	driver;
446 
447 	/* Dynamic data */
448 	struct nci_dev		*ndev;
449 	spinlock_t		rx_lock;
450 	struct work_struct	write_work;
451 	struct tty_struct	*tty;
452 	unsigned long		tx_state;
453 	struct sk_buff_head	tx_q;
454 	struct sk_buff		*tx_skb;
455 	struct sk_buff		*rx_skb;
456 	int			rx_packet_len;
457 	void			*drv_data;
458 };
459 
460 int nci_uart_register(struct nci_uart *nu);
461 void nci_uart_unregister(struct nci_uart *nu);
462 void nci_uart_set_config(struct nci_uart *nu, int baudrate, int flow_ctrl);
463 
464 #endif /* __NCI_CORE_H */
465