1 /*
2 * HCI based Driver for STMicroelectronics NFC Chip
3 *
4 * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include <linux/module.h>
20 #include <linux/nfc.h>
21 #include <net/nfc/hci.h>
22 #include <net/nfc/llc.h>
23
24 #include "st21nfca.h"
25
26 #define DRIVER_DESC "HCI NFC driver for ST21NFCA"
27
28 #define FULL_VERSION_LEN 3
29
30 /* Proprietary gates, events, commands and registers */
31
32 /* Commands that apply to all RF readers */
33 #define ST21NFCA_RF_READER_CMD_PRESENCE_CHECK 0x30
34
35 #define ST21NFCA_RF_READER_ISO15693_GATE 0x12
36 #define ST21NFCA_RF_READER_ISO15693_INVENTORY 0x01
37
38 /*
39 * Reader gate for communication with contact-less cards using Type A
40 * protocol ISO14443-3 but not compliant with ISO14443-4
41 */
42 #define ST21NFCA_RF_READER_14443_3_A_GATE 0x15
43 #define ST21NFCA_RF_READER_14443_3_A_UID 0x02
44 #define ST21NFCA_RF_READER_14443_3_A_ATQA 0x03
45 #define ST21NFCA_RF_READER_14443_3_A_SAK 0x04
46
47 #define ST21NFCA_RF_READER_F_DATARATE 0x01
48 #define ST21NFCA_RF_READER_F_DATARATE_106 0x01
49 #define ST21NFCA_RF_READER_F_DATARATE_212 0x02
50 #define ST21NFCA_RF_READER_F_DATARATE_424 0x04
51 #define ST21NFCA_RF_READER_F_POL_REQ 0x02
52 #define ST21NFCA_RF_READER_F_POL_REQ_DEFAULT 0xffff0000
53 #define ST21NFCA_RF_READER_F_NFCID2 0x03
54 #define ST21NFCA_RF_READER_F_NFCID1 0x04
55
56 #define ST21NFCA_RF_CARD_F_MODE 0x01
57 #define ST21NFCA_RF_CARD_F_NFCID2_LIST 0x04
58 #define ST21NFCA_RF_CARD_F_NFCID1 0x05
59 #define ST21NFCA_RF_CARD_F_SENS_RES 0x06
60 #define ST21NFCA_RF_CARD_F_SEL_RES 0x07
61 #define ST21NFCA_RF_CARD_F_DATARATE 0x08
62 #define ST21NFCA_RF_CARD_F_DATARATE_212_424 0x01
63
64 #define ST21NFCA_DEVICE_MGNT_PIPE 0x02
65
66 #define ST21NFCA_DM_GETINFO 0x13
67 #define ST21NFCA_DM_GETINFO_PIPE_LIST 0x02
68 #define ST21NFCA_DM_GETINFO_PIPE_INFO 0x01
69 #define ST21NFCA_DM_PIPE_CREATED 0x02
70 #define ST21NFCA_DM_PIPE_OPEN 0x04
71 #define ST21NFCA_DM_RF_ACTIVE 0x80
72 #define ST21NFCA_DM_DISCONNECT 0x30
73
74 #define ST21NFCA_DM_IS_PIPE_OPEN(p) \
75 ((p & 0x0f) == (ST21NFCA_DM_PIPE_CREATED | ST21NFCA_DM_PIPE_OPEN))
76
77 #define ST21NFCA_NFC_MODE 0x03 /* NFC_MODE parameter*/
78
79 #define ST21NFCA_EVT_HOT_PLUG 0x03
80 #define ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(x) (x->data[0] & 0x80)
81
82 #define ST21NFCA_SE_TO_PIPES 2000
83
84 static DECLARE_BITMAP(dev_mask, ST21NFCA_NUM_DEVICES);
85
86 static struct nfc_hci_gate st21nfca_gates[] = {
87 {NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_PIPE},
88 {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_LINK_MGMT_PIPE},
89 {ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE},
90
91 {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
92 {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
93 {NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
94 {NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
95 {ST21NFCA_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
96 {ST21NFCA_RF_READER_14443_3_A_GATE, NFC_HCI_INVALID_PIPE},
97 {ST21NFCA_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
98 {ST21NFCA_RF_CARD_F_GATE, NFC_HCI_INVALID_PIPE},
99
100 /* Secure element pipes are created by secure element host */
101 {ST21NFCA_CONNECTIVITY_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
102 {ST21NFCA_APDU_READER_GATE, NFC_HCI_DO_NOT_CREATE_PIPE},
103 };
104
105 struct st21nfca_pipe_info {
106 u8 pipe_state;
107 u8 src_host_id;
108 u8 src_gate_id;
109 u8 dst_host_id;
110 u8 dst_gate_id;
111 } __packed;
112
113 /* Largest headroom needed for outgoing custom commands */
114 #define ST21NFCA_CMDS_HEADROOM 7
115
st21nfca_hci_load_session(struct nfc_hci_dev * hdev)116 static int st21nfca_hci_load_session(struct nfc_hci_dev *hdev)
117 {
118 int i, j, r;
119 struct sk_buff *skb_pipe_list, *skb_pipe_info;
120 struct st21nfca_pipe_info *info;
121
122 u8 pipe_list[] = { ST21NFCA_DM_GETINFO_PIPE_LIST,
123 NFC_HCI_TERMINAL_HOST_ID
124 };
125 u8 pipe_info[] = { ST21NFCA_DM_GETINFO_PIPE_INFO,
126 NFC_HCI_TERMINAL_HOST_ID, 0
127 };
128
129 /* On ST21NFCA device pipes number are dynamics
130 * A maximum of 16 pipes can be created at the same time
131 * If pipes are already created, hci_dev_up will fail.
132 * Doing a clear all pipe is a bad idea because:
133 * - It does useless EEPROM cycling
134 * - It might cause issue for secure elements support
135 * (such as removing connectivity or APDU reader pipe)
136 * A better approach on ST21NFCA is to:
137 * - get a pipe list for each host.
138 * (eg: NFC_HCI_HOST_CONTROLLER_ID for now).
139 * (TODO Later on UICC HOST and eSE HOST)
140 * - get pipe information
141 * - match retrieved pipe list in st21nfca_gates
142 * ST21NFCA_DEVICE_MGNT_GATE is a proprietary gate
143 * with ST21NFCA_DEVICE_MGNT_PIPE.
144 * Pipe can be closed and need to be open.
145 */
146 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
147 ST21NFCA_DEVICE_MGNT_GATE,
148 ST21NFCA_DEVICE_MGNT_PIPE);
149 if (r < 0)
150 return r;
151
152 /* Get pipe list */
153 r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
154 ST21NFCA_DM_GETINFO, pipe_list, sizeof(pipe_list),
155 &skb_pipe_list);
156 if (r < 0)
157 return r;
158
159 /* Complete the existing gate_pipe table */
160 for (i = 0; i < skb_pipe_list->len; i++) {
161 pipe_info[2] = skb_pipe_list->data[i];
162 r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
163 ST21NFCA_DM_GETINFO, pipe_info,
164 sizeof(pipe_info), &skb_pipe_info);
165 if (r)
166 continue;
167
168 /*
169 * Match pipe ID and gate ID
170 * Output format from ST21NFC_DM_GETINFO is:
171 * - pipe state (1byte)
172 * - source hid (1byte)
173 * - source gid (1byte)
174 * - destination hid (1byte)
175 * - destination gid (1byte)
176 */
177 info = (struct st21nfca_pipe_info *) skb_pipe_info->data;
178 if (info->dst_gate_id == ST21NFCA_APDU_READER_GATE &&
179 info->src_host_id == NFC_HCI_UICC_HOST_ID) {
180 pr_err("Unexpected apdu_reader pipe on host %x\n",
181 info->src_host_id);
182 kfree_skb(skb_pipe_info);
183 continue;
184 }
185
186 for (j = 3; (j < ARRAY_SIZE(st21nfca_gates)) &&
187 (st21nfca_gates[j].gate != info->dst_gate_id) ; j++)
188 ;
189
190 if (j < ARRAY_SIZE(st21nfca_gates) &&
191 st21nfca_gates[j].gate == info->dst_gate_id &&
192 ST21NFCA_DM_IS_PIPE_OPEN(info->pipe_state)) {
193 hdev->init_data.gates[j].pipe = pipe_info[2];
194
195 hdev->gate2pipe[st21nfca_gates[j].gate] =
196 pipe_info[2];
197 hdev->pipes[pipe_info[2]].gate =
198 st21nfca_gates[j].gate;
199 hdev->pipes[pipe_info[2]].dest_host =
200 info->src_host_id;
201 }
202 kfree_skb(skb_pipe_info);
203 }
204
205 /*
206 * 3 gates have a well known pipe ID. Only NFC_HCI_LINK_MGMT_GATE
207 * is not yet open at this stage.
208 */
209 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
210 NFC_HCI_LINK_MGMT_GATE,
211 NFC_HCI_LINK_MGMT_PIPE);
212
213 kfree_skb(skb_pipe_list);
214 return r;
215 }
216
st21nfca_hci_open(struct nfc_hci_dev * hdev)217 static int st21nfca_hci_open(struct nfc_hci_dev *hdev)
218 {
219 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
220 int r;
221
222 mutex_lock(&info->info_lock);
223
224 if (info->state != ST21NFCA_ST_COLD) {
225 r = -EBUSY;
226 goto out;
227 }
228
229 r = info->phy_ops->enable(info->phy_id);
230
231 if (r == 0)
232 info->state = ST21NFCA_ST_READY;
233
234 out:
235 mutex_unlock(&info->info_lock);
236 return r;
237 }
238
st21nfca_hci_close(struct nfc_hci_dev * hdev)239 static void st21nfca_hci_close(struct nfc_hci_dev *hdev)
240 {
241 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
242
243 mutex_lock(&info->info_lock);
244
245 if (info->state == ST21NFCA_ST_COLD)
246 goto out;
247
248 info->phy_ops->disable(info->phy_id);
249 info->state = ST21NFCA_ST_COLD;
250
251 out:
252 mutex_unlock(&info->info_lock);
253 }
254
st21nfca_hci_ready(struct nfc_hci_dev * hdev)255 static int st21nfca_hci_ready(struct nfc_hci_dev *hdev)
256 {
257 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
258 struct sk_buff *skb;
259
260 u8 param;
261 u8 white_list[2];
262 int wl_size = 0;
263 int r;
264
265 if (info->se_status->is_uicc_present)
266 white_list[wl_size++] = NFC_HCI_UICC_HOST_ID;
267 if (info->se_status->is_ese_present)
268 white_list[wl_size++] = ST21NFCA_ESE_HOST_ID;
269
270 if (wl_size) {
271 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
272 NFC_HCI_ADMIN_WHITELIST,
273 (u8 *) &white_list, wl_size);
274 if (r < 0)
275 return r;
276 }
277
278 /* Set NFC_MODE in device management gate to enable */
279 r = nfc_hci_get_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
280 ST21NFCA_NFC_MODE, &skb);
281 if (r < 0)
282 return r;
283
284 param = skb->data[0];
285 kfree_skb(skb);
286 if (param == 0) {
287 param = 1;
288
289 r = nfc_hci_set_param(hdev, ST21NFCA_DEVICE_MGNT_GATE,
290 ST21NFCA_NFC_MODE, ¶m, 1);
291 if (r < 0)
292 return r;
293 }
294
295 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
296 NFC_HCI_EVT_END_OPERATION, NULL, 0);
297 if (r < 0)
298 return r;
299
300 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
301 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
302 if (r < 0)
303 return r;
304
305 if (skb->len != FULL_VERSION_LEN) {
306 kfree_skb(skb);
307 return -EINVAL;
308 }
309
310 print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
311 DUMP_PREFIX_NONE, 16, 1,
312 skb->data, FULL_VERSION_LEN, false);
313
314 kfree_skb(skb);
315
316 return 0;
317 }
318
st21nfca_hci_xmit(struct nfc_hci_dev * hdev,struct sk_buff * skb)319 static int st21nfca_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
320 {
321 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
322
323 return info->phy_ops->write(info->phy_id, skb);
324 }
325
st21nfca_hci_start_poll(struct nfc_hci_dev * hdev,u32 im_protocols,u32 tm_protocols)326 static int st21nfca_hci_start_poll(struct nfc_hci_dev *hdev,
327 u32 im_protocols, u32 tm_protocols)
328 {
329 int r;
330 u32 pol_req;
331 u8 param[19];
332 struct sk_buff *datarate_skb;
333
334 pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
335 __func__, im_protocols, tm_protocols);
336
337 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
338 NFC_HCI_EVT_END_OPERATION, NULL, 0);
339 if (r < 0)
340 return r;
341 if (im_protocols) {
342 /*
343 * enable polling according to im_protocols & tm_protocols
344 * - CLOSE pipe according to im_protocols & tm_protocols
345 */
346 if ((NFC_HCI_RF_READER_B_GATE & im_protocols) == 0) {
347 r = nfc_hci_disconnect_gate(hdev,
348 NFC_HCI_RF_READER_B_GATE);
349 if (r < 0)
350 return r;
351 }
352
353 if ((NFC_HCI_RF_READER_A_GATE & im_protocols) == 0) {
354 r = nfc_hci_disconnect_gate(hdev,
355 NFC_HCI_RF_READER_A_GATE);
356 if (r < 0)
357 return r;
358 }
359
360 if ((ST21NFCA_RF_READER_F_GATE & im_protocols) == 0) {
361 r = nfc_hci_disconnect_gate(hdev,
362 ST21NFCA_RF_READER_F_GATE);
363 if (r < 0)
364 return r;
365 } else {
366 hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
367 &hdev->gb_len);
368
369 if (hdev->gb == NULL || hdev->gb_len == 0) {
370 im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
371 tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
372 }
373
374 param[0] = ST21NFCA_RF_READER_F_DATARATE_106 |
375 ST21NFCA_RF_READER_F_DATARATE_212 |
376 ST21NFCA_RF_READER_F_DATARATE_424;
377 r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
378 ST21NFCA_RF_READER_F_DATARATE,
379 param, 1);
380 if (r < 0)
381 return r;
382
383 pol_req = be32_to_cpu((__force __be32)
384 ST21NFCA_RF_READER_F_POL_REQ_DEFAULT);
385 r = nfc_hci_set_param(hdev, ST21NFCA_RF_READER_F_GATE,
386 ST21NFCA_RF_READER_F_POL_REQ,
387 (u8 *) &pol_req, 4);
388 if (r < 0)
389 return r;
390 }
391
392 if ((ST21NFCA_RF_READER_14443_3_A_GATE & im_protocols) == 0) {
393 r = nfc_hci_disconnect_gate(hdev,
394 ST21NFCA_RF_READER_14443_3_A_GATE);
395 if (r < 0)
396 return r;
397 }
398
399 if ((ST21NFCA_RF_READER_ISO15693_GATE & im_protocols) == 0) {
400 r = nfc_hci_disconnect_gate(hdev,
401 ST21NFCA_RF_READER_ISO15693_GATE);
402 if (r < 0)
403 return r;
404 }
405
406 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
407 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
408 if (r < 0)
409 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
410 NFC_HCI_EVT_END_OPERATION, NULL, 0);
411 }
412
413 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
414 r = nfc_hci_get_param(hdev, ST21NFCA_RF_CARD_F_GATE,
415 ST21NFCA_RF_CARD_F_DATARATE,
416 &datarate_skb);
417 if (r < 0)
418 return r;
419
420 /* Configure the maximum supported datarate to 424Kbps */
421 if (datarate_skb->len > 0 &&
422 datarate_skb->data[0] !=
423 ST21NFCA_RF_CARD_F_DATARATE_212_424) {
424 param[0] = ST21NFCA_RF_CARD_F_DATARATE_212_424;
425 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
426 ST21NFCA_RF_CARD_F_DATARATE,
427 param, 1);
428 if (r < 0) {
429 kfree_skb(datarate_skb);
430 return r;
431 }
432 }
433 kfree_skb(datarate_skb);
434
435 /*
436 * Configure sens_res
437 *
438 * NFC Forum Digital Spec Table 7:
439 * NFCID1 size: triple (10 bytes)
440 */
441 param[0] = 0x00;
442 param[1] = 0x08;
443 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
444 ST21NFCA_RF_CARD_F_SENS_RES, param, 2);
445 if (r < 0)
446 return r;
447
448 /*
449 * Configure sel_res
450 *
451 * NFC Forum Digistal Spec Table 17:
452 * b3 set to 0b (value b7-b6):
453 * - 10b: Configured for NFC-DEP Protocol
454 */
455 param[0] = 0x40;
456 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
457 ST21NFCA_RF_CARD_F_SEL_RES, param, 1);
458 if (r < 0)
459 return r;
460
461 /* Configure NFCID1 Random uid */
462 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
463 ST21NFCA_RF_CARD_F_NFCID1, NULL, 0);
464 if (r < 0)
465 return r;
466
467 /* Configure NFCID2_LIST */
468 /* System Code */
469 param[0] = 0x00;
470 param[1] = 0x00;
471 /* NFCID2 */
472 param[2] = 0x01;
473 param[3] = 0xfe;
474 param[4] = 'S';
475 param[5] = 'T';
476 param[6] = 'M';
477 param[7] = 'i';
478 param[8] = 'c';
479 param[9] = 'r';
480 /* 8 byte Pad bytes used for polling respone frame */
481
482 /*
483 * Configuration byte:
484 * - bit 0: define the default NFCID2 entry used when the
485 * system code is equal to 'FFFF'
486 * - bit 1: use a random value for lowest 6 bytes of
487 * NFCID2 value
488 * - bit 2: ignore polling request frame if request code
489 * is equal to '01'
490 * - Other bits are RFU
491 */
492 param[18] = 0x01;
493 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
494 ST21NFCA_RF_CARD_F_NFCID2_LIST, param,
495 19);
496 if (r < 0)
497 return r;
498
499 param[0] = 0x02;
500 r = nfc_hci_set_param(hdev, ST21NFCA_RF_CARD_F_GATE,
501 ST21NFCA_RF_CARD_F_MODE, param, 1);
502 }
503
504 return r;
505 }
506
st21nfca_hci_stop_poll(struct nfc_hci_dev * hdev)507 static void st21nfca_hci_stop_poll(struct nfc_hci_dev *hdev)
508 {
509 nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
510 ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
511 }
512
st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev * hdev,u16 * atqa)513 static int st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev *hdev, u16 *atqa)
514 {
515 int r;
516 struct sk_buff *atqa_skb = NULL;
517
518 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
519 ST21NFCA_RF_READER_14443_3_A_ATQA, &atqa_skb);
520 if (r < 0)
521 goto exit;
522
523 if (atqa_skb->len != 2) {
524 r = -EPROTO;
525 goto exit;
526 }
527
528 *atqa = be16_to_cpu(*(__be16 *) atqa_skb->data);
529
530 exit:
531 kfree_skb(atqa_skb);
532 return r;
533 }
534
st21nfca_get_iso14443_3_sak(struct nfc_hci_dev * hdev,u8 * sak)535 static int st21nfca_get_iso14443_3_sak(struct nfc_hci_dev *hdev, u8 *sak)
536 {
537 int r;
538 struct sk_buff *sak_skb = NULL;
539
540 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
541 ST21NFCA_RF_READER_14443_3_A_SAK, &sak_skb);
542 if (r < 0)
543 goto exit;
544
545 if (sak_skb->len != 1) {
546 r = -EPROTO;
547 goto exit;
548 }
549
550 *sak = sak_skb->data[0];
551
552 exit:
553 kfree_skb(sak_skb);
554 return r;
555 }
556
st21nfca_get_iso14443_3_uid(struct nfc_hci_dev * hdev,u8 * uid,int * len)557 static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *uid,
558 int *len)
559 {
560 int r;
561 struct sk_buff *uid_skb = NULL;
562
563 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE,
564 ST21NFCA_RF_READER_14443_3_A_UID, &uid_skb);
565 if (r < 0)
566 goto exit;
567
568 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
569 r = -EPROTO;
570 goto exit;
571 }
572
573 memcpy(uid, uid_skb->data, uid_skb->len);
574 *len = uid_skb->len;
575 exit:
576 kfree_skb(uid_skb);
577 return r;
578 }
579
st21nfca_get_iso15693_inventory(struct nfc_hci_dev * hdev,struct nfc_target * target)580 static int st21nfca_get_iso15693_inventory(struct nfc_hci_dev *hdev,
581 struct nfc_target *target)
582 {
583 int r;
584 struct sk_buff *inventory_skb = NULL;
585
586 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_ISO15693_GATE,
587 ST21NFCA_RF_READER_ISO15693_INVENTORY,
588 &inventory_skb);
589 if (r < 0)
590 goto exit;
591
592 skb_pull(inventory_skb, 2);
593
594 if (inventory_skb->len == 0 ||
595 inventory_skb->len > NFC_ISO15693_UID_MAXSIZE) {
596 r = -EPROTO;
597 goto exit;
598 }
599
600 memcpy(target->iso15693_uid, inventory_skb->data, inventory_skb->len);
601 target->iso15693_dsfid = inventory_skb->data[1];
602 target->is_iso15693 = 1;
603 exit:
604 kfree_skb(inventory_skb);
605 return r;
606 }
607
st21nfca_hci_dep_link_up(struct nfc_hci_dev * hdev,struct nfc_target * target,u8 comm_mode,u8 * gb,size_t gb_len)608 static int st21nfca_hci_dep_link_up(struct nfc_hci_dev *hdev,
609 struct nfc_target *target, u8 comm_mode,
610 u8 *gb, size_t gb_len)
611 {
612 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
613
614 info->dep_info.idx = target->idx;
615 return st21nfca_im_send_atr_req(hdev, gb, gb_len);
616 }
617
st21nfca_hci_dep_link_down(struct nfc_hci_dev * hdev)618 static int st21nfca_hci_dep_link_down(struct nfc_hci_dev *hdev)
619 {
620 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
621
622 info->state = ST21NFCA_ST_READY;
623
624 return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
625 ST21NFCA_DM_DISCONNECT, NULL, 0, NULL);
626 }
627
st21nfca_hci_target_from_gate(struct nfc_hci_dev * hdev,u8 gate,struct nfc_target * target)628 static int st21nfca_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
629 struct nfc_target *target)
630 {
631 int r, len;
632 u16 atqa;
633 u8 sak;
634 u8 uid[NFC_NFCID1_MAXSIZE];
635
636 switch (gate) {
637 case ST21NFCA_RF_READER_F_GATE:
638 target->supported_protocols = NFC_PROTO_FELICA_MASK;
639 break;
640 case ST21NFCA_RF_READER_14443_3_A_GATE:
641 /* ISO14443-3 type 1 or 2 tags */
642 r = st21nfca_get_iso14443_3_atqa(hdev, &atqa);
643 if (r < 0)
644 return r;
645 if (atqa == 0x000c) {
646 target->supported_protocols = NFC_PROTO_JEWEL_MASK;
647 target->sens_res = 0x0c00;
648 } else {
649 r = st21nfca_get_iso14443_3_sak(hdev, &sak);
650 if (r < 0)
651 return r;
652
653 r = st21nfca_get_iso14443_3_uid(hdev, uid, &len);
654 if (r < 0)
655 return r;
656
657 target->supported_protocols =
658 nfc_hci_sak_to_protocol(sak);
659 if (target->supported_protocols == 0xffffffff)
660 return -EPROTO;
661
662 target->sens_res = atqa;
663 target->sel_res = sak;
664 memcpy(target->nfcid1, uid, len);
665 target->nfcid1_len = len;
666 }
667
668 break;
669 case ST21NFCA_RF_READER_ISO15693_GATE:
670 target->supported_protocols = NFC_PROTO_ISO15693_MASK;
671 r = st21nfca_get_iso15693_inventory(hdev, target);
672 if (r < 0)
673 return r;
674 break;
675 default:
676 return -EPROTO;
677 }
678
679 return 0;
680 }
681
st21nfca_hci_complete_target_discovered(struct nfc_hci_dev * hdev,u8 gate,struct nfc_target * target)682 static int st21nfca_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
683 u8 gate,
684 struct nfc_target *target)
685 {
686 int r;
687 struct sk_buff *nfcid_skb = NULL;
688
689 if (gate == ST21NFCA_RF_READER_F_GATE) {
690 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
691 ST21NFCA_RF_READER_F_NFCID2, &nfcid_skb);
692 if (r < 0)
693 goto exit;
694
695 if (nfcid_skb->len > NFC_SENSF_RES_MAXSIZE) {
696 r = -EPROTO;
697 goto exit;
698 }
699
700 /*
701 * - After the recepton of polling response for type F frame
702 * at 212 or 424 Kbit/s, NFCID2 registry parameters will be
703 * updated.
704 * - After the reception of SEL_RES with NFCIP-1 compliant bit
705 * set for type A frame NFCID1 will be updated
706 */
707 if (nfcid_skb->len > 0) {
708 /* P2P in type F */
709 memcpy(target->sensf_res, nfcid_skb->data,
710 nfcid_skb->len);
711 target->sensf_res_len = nfcid_skb->len;
712 /* NFC Forum Digital Protocol Table 44 */
713 if (target->sensf_res[0] == 0x01 &&
714 target->sensf_res[1] == 0xfe)
715 target->supported_protocols =
716 NFC_PROTO_NFC_DEP_MASK;
717 else
718 target->supported_protocols =
719 NFC_PROTO_FELICA_MASK;
720 } else {
721 kfree_skb(nfcid_skb);
722 /* P2P in type A */
723 r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_F_GATE,
724 ST21NFCA_RF_READER_F_NFCID1,
725 &nfcid_skb);
726 if (r < 0)
727 goto exit;
728
729 if (nfcid_skb->len > NFC_NFCID1_MAXSIZE) {
730 r = -EPROTO;
731 goto exit;
732 }
733 memcpy(target->sensf_res, nfcid_skb->data,
734 nfcid_skb->len);
735 target->sensf_res_len = nfcid_skb->len;
736 target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
737 }
738 target->hci_reader_gate = ST21NFCA_RF_READER_F_GATE;
739 }
740 r = 1;
741 exit:
742 kfree_skb(nfcid_skb);
743 return r;
744 }
745
746 #define ST21NFCA_CB_TYPE_READER_ISO15693 1
st21nfca_hci_data_exchange_cb(void * context,struct sk_buff * skb,int err)747 static void st21nfca_hci_data_exchange_cb(void *context, struct sk_buff *skb,
748 int err)
749 {
750 struct st21nfca_hci_info *info = context;
751
752 switch (info->async_cb_type) {
753 case ST21NFCA_CB_TYPE_READER_ISO15693:
754 if (err == 0)
755 skb_trim(skb, skb->len - 1);
756 info->async_cb(info->async_cb_context, skb, err);
757 break;
758 default:
759 if (err == 0)
760 kfree_skb(skb);
761 break;
762 }
763 }
764
765 /*
766 * Returns:
767 * <= 0: driver handled the data exchange
768 * 1: driver doesn't especially handle, please do standard processing
769 */
st21nfca_hci_im_transceive(struct nfc_hci_dev * hdev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)770 static int st21nfca_hci_im_transceive(struct nfc_hci_dev *hdev,
771 struct nfc_target *target,
772 struct sk_buff *skb,
773 data_exchange_cb_t cb, void *cb_context)
774 {
775 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
776
777 pr_info(DRIVER_DESC ": %s for gate=%d len=%d\n", __func__,
778 target->hci_reader_gate, skb->len);
779
780 switch (target->hci_reader_gate) {
781 case ST21NFCA_RF_READER_F_GATE:
782 if (target->supported_protocols == NFC_PROTO_NFC_DEP_MASK)
783 return st21nfca_im_send_dep_req(hdev, skb);
784
785 *(u8 *)skb_push(skb, 1) = 0x1a;
786 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
787 ST21NFCA_WR_XCHG_DATA, skb->data,
788 skb->len, cb, cb_context);
789 case ST21NFCA_RF_READER_14443_3_A_GATE:
790 *(u8 *)skb_push(skb, 1) = 0x1a; /* CTR, see spec:10.2.2.1 */
791
792 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
793 ST21NFCA_WR_XCHG_DATA, skb->data,
794 skb->len, cb, cb_context);
795 case ST21NFCA_RF_READER_ISO15693_GATE:
796 info->async_cb_type = ST21NFCA_CB_TYPE_READER_ISO15693;
797 info->async_cb = cb;
798 info->async_cb_context = cb_context;
799
800 *(u8 *)skb_push(skb, 1) = 0x17;
801
802 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
803 ST21NFCA_WR_XCHG_DATA, skb->data,
804 skb->len,
805 st21nfca_hci_data_exchange_cb,
806 info);
807 break;
808 default:
809 return 1;
810 }
811 }
812
st21nfca_hci_tm_send(struct nfc_hci_dev * hdev,struct sk_buff * skb)813 static int st21nfca_hci_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
814 {
815 return st21nfca_tm_send_dep_res(hdev, skb);
816 }
817
st21nfca_hci_check_presence(struct nfc_hci_dev * hdev,struct nfc_target * target)818 static int st21nfca_hci_check_presence(struct nfc_hci_dev *hdev,
819 struct nfc_target *target)
820 {
821 u8 fwi = 0x11;
822
823 switch (target->hci_reader_gate) {
824 case NFC_HCI_RF_READER_A_GATE:
825 case NFC_HCI_RF_READER_B_GATE:
826 /*
827 * PRESENCE_CHECK on those gates is available
828 * However, the answer to this command is taking 3 * fwi
829 * if the card is no present.
830 * Instead, we send an empty I-Frame with a very short
831 * configurable fwi ~604µs.
832 */
833 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
834 ST21NFCA_WR_XCHG_DATA, &fwi, 1, NULL);
835 case ST21NFCA_RF_READER_14443_3_A_GATE:
836 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
837 ST21NFCA_RF_READER_CMD_PRESENCE_CHECK,
838 NULL, 0, NULL);
839 default:
840 return -EOPNOTSUPP;
841 }
842 }
843
st21nfca_hci_cmd_received(struct nfc_hci_dev * hdev,u8 pipe,u8 cmd,struct sk_buff * skb)844 static void st21nfca_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
845 struct sk_buff *skb)
846 {
847 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
848 u8 gate = hdev->pipes[pipe].gate;
849
850 pr_debug("cmd: %x\n", cmd);
851
852 switch (cmd) {
853 case NFC_HCI_ANY_OPEN_PIPE:
854 if (gate != ST21NFCA_APDU_READER_GATE &&
855 hdev->pipes[pipe].dest_host != NFC_HCI_UICC_HOST_ID)
856 info->se_info.count_pipes++;
857
858 if (info->se_info.count_pipes == info->se_info.expected_pipes) {
859 del_timer_sync(&info->se_info.se_active_timer);
860 info->se_info.se_active = false;
861 info->se_info.count_pipes = 0;
862 complete(&info->se_info.req_completion);
863 }
864 break;
865 }
866 }
867
st21nfca_admin_event_received(struct nfc_hci_dev * hdev,u8 event,struct sk_buff * skb)868 static int st21nfca_admin_event_received(struct nfc_hci_dev *hdev, u8 event,
869 struct sk_buff *skb)
870 {
871 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
872
873 pr_debug("admin event: %x\n", event);
874
875 switch (event) {
876 case ST21NFCA_EVT_HOT_PLUG:
877 if (info->se_info.se_active) {
878 if (!ST21NFCA_EVT_HOT_PLUG_IS_INHIBITED(skb)) {
879 del_timer_sync(&info->se_info.se_active_timer);
880 info->se_info.se_active = false;
881 complete(&info->se_info.req_completion);
882 } else {
883 mod_timer(&info->se_info.se_active_timer,
884 jiffies +
885 msecs_to_jiffies(ST21NFCA_SE_TO_PIPES));
886 }
887 }
888 break;
889 default:
890 nfc_err(&hdev->ndev->dev, "Unexpected event on admin gate\n");
891 }
892 kfree_skb(skb);
893 return 0;
894 }
895
896 /*
897 * Returns:
898 * <= 0: driver handled the event, skb consumed
899 * 1: driver does not handle the event, please do standard processing
900 */
st21nfca_hci_event_received(struct nfc_hci_dev * hdev,u8 pipe,u8 event,struct sk_buff * skb)901 static int st21nfca_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe,
902 u8 event, struct sk_buff *skb)
903 {
904 u8 gate = hdev->pipes[pipe].gate;
905 u8 host = hdev->pipes[pipe].dest_host;
906
907 pr_debug("hci event: %d gate: %x\n", event, gate);
908
909 switch (gate) {
910 case NFC_HCI_ADMIN_GATE:
911 return st21nfca_admin_event_received(hdev, event, skb);
912 case ST21NFCA_RF_CARD_F_GATE:
913 return st21nfca_dep_event_received(hdev, event, skb);
914 case ST21NFCA_CONNECTIVITY_GATE:
915 return st21nfca_connectivity_event_received(hdev, host,
916 event, skb);
917 case ST21NFCA_APDU_READER_GATE:
918 return st21nfca_apdu_reader_event_received(hdev, event, skb);
919 case NFC_HCI_LOOPBACK_GATE:
920 return st21nfca_hci_loopback_event_received(hdev, event, skb);
921 default:
922 return 1;
923 }
924 }
925
926 static struct nfc_hci_ops st21nfca_hci_ops = {
927 .open = st21nfca_hci_open,
928 .close = st21nfca_hci_close,
929 .load_session = st21nfca_hci_load_session,
930 .hci_ready = st21nfca_hci_ready,
931 .xmit = st21nfca_hci_xmit,
932 .start_poll = st21nfca_hci_start_poll,
933 .stop_poll = st21nfca_hci_stop_poll,
934 .dep_link_up = st21nfca_hci_dep_link_up,
935 .dep_link_down = st21nfca_hci_dep_link_down,
936 .target_from_gate = st21nfca_hci_target_from_gate,
937 .complete_target_discovered = st21nfca_hci_complete_target_discovered,
938 .im_transceive = st21nfca_hci_im_transceive,
939 .tm_send = st21nfca_hci_tm_send,
940 .check_presence = st21nfca_hci_check_presence,
941 .event_received = st21nfca_hci_event_received,
942 .cmd_received = st21nfca_hci_cmd_received,
943 .discover_se = st21nfca_hci_discover_se,
944 .enable_se = st21nfca_hci_enable_se,
945 .disable_se = st21nfca_hci_disable_se,
946 .se_io = st21nfca_hci_se_io,
947 };
948
st21nfca_hci_probe(void * phy_id,struct nfc_phy_ops * phy_ops,char * llc_name,int phy_headroom,int phy_tailroom,int phy_payload,struct nfc_hci_dev ** hdev,struct st21nfca_se_status * se_status)949 int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops,
950 char *llc_name, int phy_headroom, int phy_tailroom,
951 int phy_payload, struct nfc_hci_dev **hdev,
952 struct st21nfca_se_status *se_status)
953 {
954 struct st21nfca_hci_info *info;
955 int r = 0;
956 int dev_num;
957 u32 protocols;
958 struct nfc_hci_init_data init_data;
959 unsigned long quirks = 0;
960
961 info = kzalloc(sizeof(struct st21nfca_hci_info), GFP_KERNEL);
962 if (!info)
963 return -ENOMEM;
964
965 info->phy_ops = phy_ops;
966 info->phy_id = phy_id;
967 info->state = ST21NFCA_ST_COLD;
968 mutex_init(&info->info_lock);
969
970 init_data.gate_count = ARRAY_SIZE(st21nfca_gates);
971
972 memcpy(init_data.gates, st21nfca_gates, sizeof(st21nfca_gates));
973
974 /*
975 * Session id must include the driver name + i2c bus addr
976 * persistent info to discriminate 2 identical chips
977 */
978 dev_num = find_first_zero_bit(dev_mask, ST21NFCA_NUM_DEVICES);
979 if (dev_num >= ST21NFCA_NUM_DEVICES) {
980 r = -ENODEV;
981 goto err_alloc_hdev;
982 }
983
984 set_bit(dev_num, dev_mask);
985
986 scnprintf(init_data.session_id, sizeof(init_data.session_id), "%s%2x",
987 "ST21AH", dev_num);
988
989 protocols = NFC_PROTO_JEWEL_MASK |
990 NFC_PROTO_MIFARE_MASK |
991 NFC_PROTO_FELICA_MASK |
992 NFC_PROTO_ISO14443_MASK |
993 NFC_PROTO_ISO14443_B_MASK |
994 NFC_PROTO_ISO15693_MASK |
995 NFC_PROTO_NFC_DEP_MASK;
996
997 set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
998
999 info->hdev =
1000 nfc_hci_allocate_device(&st21nfca_hci_ops, &init_data, quirks,
1001 protocols, llc_name,
1002 phy_headroom + ST21NFCA_CMDS_HEADROOM,
1003 phy_tailroom, phy_payload);
1004
1005 if (!info->hdev) {
1006 pr_err("Cannot allocate nfc hdev.\n");
1007 r = -ENOMEM;
1008 goto err_alloc_hdev;
1009 }
1010
1011 info->se_status = se_status;
1012
1013 nfc_hci_set_clientdata(info->hdev, info);
1014
1015 r = nfc_hci_register_device(info->hdev);
1016 if (r)
1017 goto err_regdev;
1018
1019 *hdev = info->hdev;
1020 st21nfca_dep_init(info->hdev);
1021 st21nfca_se_init(info->hdev);
1022 st21nfca_vendor_cmds_init(info->hdev);
1023
1024 return 0;
1025
1026 err_regdev:
1027 nfc_hci_free_device(info->hdev);
1028
1029 err_alloc_hdev:
1030 kfree(info);
1031
1032 return r;
1033 }
1034 EXPORT_SYMBOL(st21nfca_hci_probe);
1035
st21nfca_hci_remove(struct nfc_hci_dev * hdev)1036 void st21nfca_hci_remove(struct nfc_hci_dev *hdev)
1037 {
1038 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
1039
1040 st21nfca_dep_deinit(hdev);
1041 st21nfca_se_deinit(hdev);
1042 nfc_hci_unregister_device(hdev);
1043 nfc_hci_free_device(hdev);
1044 kfree(info);
1045 }
1046 EXPORT_SYMBOL(st21nfca_hci_remove);
1047
1048 MODULE_LICENSE("GPL");
1049 MODULE_DESCRIPTION(DRIVER_DESC);
1050
