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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * HCI based Driver for Inside Secure microread NFC Chip
4 *
5 * Copyright (C) 2013 Intel Corporation. All rights reserved.
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/delay.h>
12#include <linux/slab.h>
13#include <linux/crc-ccitt.h>
14
15#include <linux/nfc.h>
16#include <net/nfc/nfc.h>
17#include <net/nfc/hci.h>
18
19#include "microread.h"
20
21/* Proprietary gates, events, commands and registers */
22/* Admin */
23#define MICROREAD_GATE_ID_ADM NFC_HCI_ADMIN_GATE
24#define MICROREAD_GATE_ID_MGT 0x01
25#define MICROREAD_GATE_ID_OS 0x02
26#define MICROREAD_GATE_ID_TESTRF 0x03
27#define MICROREAD_GATE_ID_LOOPBACK NFC_HCI_LOOPBACK_GATE
28#define MICROREAD_GATE_ID_IDT NFC_HCI_ID_MGMT_GATE
29#define MICROREAD_GATE_ID_LMS NFC_HCI_LINK_MGMT_GATE
30
31/* Reader */
32#define MICROREAD_GATE_ID_MREAD_GEN 0x10
33#define MICROREAD_GATE_ID_MREAD_ISO_B NFC_HCI_RF_READER_B_GATE
34#define MICROREAD_GATE_ID_MREAD_NFC_T1 0x12
35#define MICROREAD_GATE_ID_MREAD_ISO_A NFC_HCI_RF_READER_A_GATE
36#define MICROREAD_GATE_ID_MREAD_NFC_T3 0x14
37#define MICROREAD_GATE_ID_MREAD_ISO_15_3 0x15
38#define MICROREAD_GATE_ID_MREAD_ISO_15_2 0x16
39#define MICROREAD_GATE_ID_MREAD_ISO_B_3 0x17
40#define MICROREAD_GATE_ID_MREAD_BPRIME 0x18
41#define MICROREAD_GATE_ID_MREAD_ISO_A_3 0x19
42
43/* Card */
44#define MICROREAD_GATE_ID_MCARD_GEN 0x20
45#define MICROREAD_GATE_ID_MCARD_ISO_B 0x21
46#define MICROREAD_GATE_ID_MCARD_BPRIME 0x22
47#define MICROREAD_GATE_ID_MCARD_ISO_A 0x23
48#define MICROREAD_GATE_ID_MCARD_NFC_T3 0x24
49#define MICROREAD_GATE_ID_MCARD_ISO_15_3 0x25
50#define MICROREAD_GATE_ID_MCARD_ISO_15_2 0x26
51#define MICROREAD_GATE_ID_MCARD_ISO_B_2 0x27
52#define MICROREAD_GATE_ID_MCARD_ISO_CUSTOM 0x28
53#define MICROREAD_GATE_ID_SECURE_ELEMENT 0x2F
54
55/* P2P */
56#define MICROREAD_GATE_ID_P2P_GEN 0x30
57#define MICROREAD_GATE_ID_P2P_TARGET 0x31
58#define MICROREAD_PAR_P2P_TARGET_MODE 0x01
59#define MICROREAD_PAR_P2P_TARGET_GT 0x04
60#define MICROREAD_GATE_ID_P2P_INITIATOR 0x32
61#define MICROREAD_PAR_P2P_INITIATOR_GI 0x01
62#define MICROREAD_PAR_P2P_INITIATOR_GT 0x03
63
64/* Those pipes are created/opened by default in the chip */
65#define MICROREAD_PIPE_ID_LMS 0x00
66#define MICROREAD_PIPE_ID_ADMIN 0x01
67#define MICROREAD_PIPE_ID_MGT 0x02
68#define MICROREAD_PIPE_ID_OS 0x03
69#define MICROREAD_PIPE_ID_HDS_LOOPBACK 0x04
70#define MICROREAD_PIPE_ID_HDS_IDT 0x05
71#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_B 0x08
72#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_BPRIME 0x09
73#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_A 0x0A
74#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_15_3 0x0B
75#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_15_2 0x0C
76#define MICROREAD_PIPE_ID_HDS_MCARD_NFC_T3 0x0D
77#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_B_2 0x0E
78#define MICROREAD_PIPE_ID_HDS_MCARD_CUSTOM 0x0F
79#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_B 0x10
80#define MICROREAD_PIPE_ID_HDS_MREAD_NFC_T1 0x11
81#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_A 0x12
82#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_15_3 0x13
83#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_15_2 0x14
84#define MICROREAD_PIPE_ID_HDS_MREAD_NFC_T3 0x15
85#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_B_3 0x16
86#define MICROREAD_PIPE_ID_HDS_MREAD_BPRIME 0x17
87#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_A_3 0x18
88#define MICROREAD_PIPE_ID_HDS_MREAD_GEN 0x1B
89#define MICROREAD_PIPE_ID_HDS_STACKED_ELEMENT 0x1C
90#define MICROREAD_PIPE_ID_HDS_INSTANCES 0x1D
91#define MICROREAD_PIPE_ID_HDS_TESTRF 0x1E
92#define MICROREAD_PIPE_ID_HDS_P2P_TARGET 0x1F
93#define MICROREAD_PIPE_ID_HDS_P2P_INITIATOR 0x20
94
95/* Events */
96#define MICROREAD_EVT_MREAD_DISCOVERY_OCCURED NFC_HCI_EVT_TARGET_DISCOVERED
97#define MICROREAD_EVT_MREAD_CARD_FOUND 0x3D
98#define MICROREAD_EMCF_A_ATQA 0
99#define MICROREAD_EMCF_A_SAK 2
100#define MICROREAD_EMCF_A_LEN 3
101#define MICROREAD_EMCF_A_UID 4
102#define MICROREAD_EMCF_A3_ATQA 0
103#define MICROREAD_EMCF_A3_SAK 2
104#define MICROREAD_EMCF_A3_LEN 3
105#define MICROREAD_EMCF_A3_UID 4
106#define MICROREAD_EMCF_B_UID 0
107#define MICROREAD_EMCF_T1_ATQA 0
108#define MICROREAD_EMCF_T1_UID 4
109#define MICROREAD_EMCF_T3_UID 0
110#define MICROREAD_EVT_MREAD_DISCOVERY_START NFC_HCI_EVT_READER_REQUESTED
111#define MICROREAD_EVT_MREAD_DISCOVERY_START_SOME 0x3E
112#define MICROREAD_EVT_MREAD_DISCOVERY_STOP NFC_HCI_EVT_END_OPERATION
113#define MICROREAD_EVT_MREAD_SIM_REQUESTS 0x3F
114#define MICROREAD_EVT_MCARD_EXCHANGE NFC_HCI_EVT_TARGET_DISCOVERED
115#define MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_TO_RF 0x20
116#define MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_FROM_RF 0x21
117#define MICROREAD_EVT_MCARD_FIELD_ON 0x11
118#define MICROREAD_EVT_P2P_TARGET_ACTIVATED 0x13
119#define MICROREAD_EVT_P2P_TARGET_DEACTIVATED 0x12
120#define MICROREAD_EVT_MCARD_FIELD_OFF 0x14
121
122/* Commands */
123#define MICROREAD_CMD_MREAD_EXCHANGE 0x10
124#define MICROREAD_CMD_MREAD_SUBSCRIBE 0x3F
125
126/* Hosts IDs */
127#define MICROREAD_ELT_ID_HDS NFC_HCI_TERMINAL_HOST_ID
128#define MICROREAD_ELT_ID_SIM NFC_HCI_UICC_HOST_ID
129#define MICROREAD_ELT_ID_SE1 0x03
130#define MICROREAD_ELT_ID_SE2 0x04
131#define MICROREAD_ELT_ID_SE3 0x05
132
133static const struct nfc_hci_gate microread_gates[] = {
134 {MICROREAD_GATE_ID_ADM, MICROREAD_PIPE_ID_ADMIN},
135 {MICROREAD_GATE_ID_LOOPBACK, MICROREAD_PIPE_ID_HDS_LOOPBACK},
136 {MICROREAD_GATE_ID_IDT, MICROREAD_PIPE_ID_HDS_IDT},
137 {MICROREAD_GATE_ID_LMS, MICROREAD_PIPE_ID_LMS},
138 {MICROREAD_GATE_ID_MREAD_ISO_B, MICROREAD_PIPE_ID_HDS_MREAD_ISO_B},
139 {MICROREAD_GATE_ID_MREAD_ISO_A, MICROREAD_PIPE_ID_HDS_MREAD_ISO_A},
140 {MICROREAD_GATE_ID_MREAD_ISO_A_3, MICROREAD_PIPE_ID_HDS_MREAD_ISO_A_3},
141 {MICROREAD_GATE_ID_MGT, MICROREAD_PIPE_ID_MGT},
142 {MICROREAD_GATE_ID_OS, MICROREAD_PIPE_ID_OS},
143 {MICROREAD_GATE_ID_MREAD_NFC_T1, MICROREAD_PIPE_ID_HDS_MREAD_NFC_T1},
144 {MICROREAD_GATE_ID_MREAD_NFC_T3, MICROREAD_PIPE_ID_HDS_MREAD_NFC_T3},
145 {MICROREAD_GATE_ID_P2P_TARGET, MICROREAD_PIPE_ID_HDS_P2P_TARGET},
146 {MICROREAD_GATE_ID_P2P_INITIATOR, MICROREAD_PIPE_ID_HDS_P2P_INITIATOR}
147};
148
149/* Largest headroom needed for outgoing custom commands */
150#define MICROREAD_CMDS_HEADROOM 2
151#define MICROREAD_CMD_TAILROOM 2
152
153struct microread_info {
154 const struct nfc_phy_ops *phy_ops;
155 void *phy_id;
156
157 struct nfc_hci_dev *hdev;
158
159 int async_cb_type;
160 data_exchange_cb_t async_cb;
161 void *async_cb_context;
162};
163
164static int microread_open(struct nfc_hci_dev *hdev)
165{
166 struct microread_info *info = nfc_hci_get_clientdata(hdev);
167
168 return info->phy_ops->enable(info->phy_id);
169}
170
171static void microread_close(struct nfc_hci_dev *hdev)
172{
173 struct microread_info *info = nfc_hci_get_clientdata(hdev);
174
175 info->phy_ops->disable(info->phy_id);
176}
177
178static int microread_hci_ready(struct nfc_hci_dev *hdev)
179{
180 int r;
181 u8 param[4];
182
183 param[0] = 0x03;
184 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
185 MICROREAD_CMD_MREAD_SUBSCRIBE, param, 1, NULL);
186 if (r)
187 return r;
188
189 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_A_3,
190 MICROREAD_CMD_MREAD_SUBSCRIBE, NULL, 0, NULL);
191 if (r)
192 return r;
193
194 param[0] = 0x00;
195 param[1] = 0x03;
196 param[2] = 0x00;
197 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_B,
198 MICROREAD_CMD_MREAD_SUBSCRIBE, param, 3, NULL);
199 if (r)
200 return r;
201
202 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_NFC_T1,
203 MICROREAD_CMD_MREAD_SUBSCRIBE, NULL, 0, NULL);
204 if (r)
205 return r;
206
207 param[0] = 0xFF;
208 param[1] = 0xFF;
209 param[2] = 0x00;
210 param[3] = 0x00;
211 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_NFC_T3,
212 MICROREAD_CMD_MREAD_SUBSCRIBE, param, 4, NULL);
213
214 return r;
215}
216
217static int microread_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
218{
219 struct microread_info *info = nfc_hci_get_clientdata(hdev);
220
221 return info->phy_ops->write(info->phy_id, skb);
222}
223
224static int microread_start_poll(struct nfc_hci_dev *hdev,
225 u32 im_protocols, u32 tm_protocols)
226{
227 int r;
228
229 u8 param[2];
230 u8 mode;
231
232 param[0] = 0x00;
233 param[1] = 0x00;
234
235 if (im_protocols & NFC_PROTO_ISO14443_MASK)
236 param[0] |= (1 << 2);
237
238 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
239 param[0] |= 1;
240
241 if (im_protocols & NFC_PROTO_MIFARE_MASK)
242 param[1] |= 1;
243
244 if (im_protocols & NFC_PROTO_JEWEL_MASK)
245 param[0] |= (1 << 1);
246
247 if (im_protocols & NFC_PROTO_FELICA_MASK)
248 param[0] |= (1 << 5);
249
250 if (im_protocols & NFC_PROTO_NFC_DEP_MASK)
251 param[1] |= (1 << 1);
252
253 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
254 hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
255 &hdev->gb_len);
256 if (hdev->gb == NULL || hdev->gb_len == 0) {
257 im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
258 tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
259 }
260 }
261
262 r = nfc_hci_send_event(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
263 MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL, 0);
264 if (r)
265 return r;
266
267 mode = 0xff;
268 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
269 MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
270 if (r)
271 return r;
272
273 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
274 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_INITIATOR,
275 MICROREAD_PAR_P2P_INITIATOR_GI,
276 hdev->gb, hdev->gb_len);
277 if (r)
278 return r;
279 }
280
281 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
282 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
283 MICROREAD_PAR_P2P_TARGET_GT,
284 hdev->gb, hdev->gb_len);
285 if (r)
286 return r;
287
288 mode = 0x02;
289 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
290 MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
291 if (r)
292 return r;
293 }
294
295 return nfc_hci_send_event(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
296 MICROREAD_EVT_MREAD_DISCOVERY_START_SOME,
297 param, 2);
298}
299
300static int microread_dep_link_up(struct nfc_hci_dev *hdev,
301 struct nfc_target *target, u8 comm_mode,
302 u8 *gb, size_t gb_len)
303{
304 struct sk_buff *rgb_skb = NULL;
305 int r;
306
307 r = nfc_hci_get_param(hdev, target->hci_reader_gate,
308 MICROREAD_PAR_P2P_INITIATOR_GT, &rgb_skb);
309 if (r < 0)
310 return r;
311
312 if (rgb_skb->len == 0 || rgb_skb->len > NFC_GB_MAXSIZE) {
313 r = -EPROTO;
314 goto exit;
315 }
316
317 r = nfc_set_remote_general_bytes(hdev->ndev, rgb_skb->data,
318 rgb_skb->len);
319 if (r == 0)
320 r = nfc_dep_link_is_up(hdev->ndev, target->idx, comm_mode,
321 NFC_RF_INITIATOR);
322exit:
323 kfree_skb(rgb_skb);
324
325 return r;
326}
327
328static int microread_dep_link_down(struct nfc_hci_dev *hdev)
329{
330 return nfc_hci_send_event(hdev, MICROREAD_GATE_ID_P2P_INITIATOR,
331 MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL, 0);
332}
333
334static int microread_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
335 struct nfc_target *target)
336{
337 switch (gate) {
338 case MICROREAD_GATE_ID_P2P_INITIATOR:
339 target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
340 break;
341 default:
342 return -EPROTO;
343 }
344
345 return 0;
346}
347
348static int microread_complete_target_discovered(struct nfc_hci_dev *hdev,
349 u8 gate,
350 struct nfc_target *target)
351{
352 return 0;
353}
354
355#define MICROREAD_CB_TYPE_READER_ALL 1
356
357static void microread_im_transceive_cb(void *context, struct sk_buff *skb,
358 int err)
359{
360 const struct microread_info *info = context;
361
362 switch (info->async_cb_type) {
363 case MICROREAD_CB_TYPE_READER_ALL:
364 if (err == 0) {
365 if (skb->len == 0) {
366 kfree_skb(skb);
367 info->async_cb(info->async_cb_context, NULL,
368 -EPROTO);
369 return;
370 }
371
372 if (skb->data[skb->len - 1] != 0) {
373 err = nfc_hci_result_to_errno(
374 skb->data[skb->len - 1]);
375 kfree_skb(skb);
376 info->async_cb(info->async_cb_context, NULL,
377 err);
378 return;
379 }
380
381 skb_trim(skb, skb->len - 1); /* RF Error ind. */
382 }
383 info->async_cb(info->async_cb_context, skb, err);
384 break;
385 default:
386 if (err == 0)
387 kfree_skb(skb);
388 break;
389 }
390}
391
392/*
393 * Returns:
394 * <= 0: driver handled the data exchange
395 * 1: driver doesn't especially handle, please do standard processing
396 */
397static int microread_im_transceive(struct nfc_hci_dev *hdev,
398 struct nfc_target *target,
399 struct sk_buff *skb, data_exchange_cb_t cb,
400 void *cb_context)
401{
402 struct microread_info *info = nfc_hci_get_clientdata(hdev);
403 u8 control_bits;
404 u16 crc;
405
406 pr_info("data exchange to gate 0x%x\n", target->hci_reader_gate);
407
408 if (target->hci_reader_gate == MICROREAD_GATE_ID_P2P_INITIATOR) {
409 *(u8 *)skb_push(skb, 1) = 0;
410
411 return nfc_hci_send_event(hdev, target->hci_reader_gate,
412 MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_TO_RF,
413 skb->data, skb->len);
414 }
415
416 switch (target->hci_reader_gate) {
417 case MICROREAD_GATE_ID_MREAD_ISO_A:
418 control_bits = 0xCB;
419 break;
420 case MICROREAD_GATE_ID_MREAD_ISO_A_3:
421 control_bits = 0xCB;
422 break;
423 case MICROREAD_GATE_ID_MREAD_ISO_B:
424 control_bits = 0xCB;
425 break;
426 case MICROREAD_GATE_ID_MREAD_NFC_T1:
427 control_bits = 0x1B;
428
429 crc = crc_ccitt(0xffff, skb->data, skb->len);
430 crc = ~crc;
431 skb_put_u8(skb, crc & 0xff);
432 skb_put_u8(skb, crc >> 8);
433 break;
434 case MICROREAD_GATE_ID_MREAD_NFC_T3:
435 control_bits = 0xDB;
436 break;
437 default:
438 pr_info("Abort im_transceive to invalid gate 0x%x\n",
439 target->hci_reader_gate);
440 return 1;
441 }
442
443 *(u8 *)skb_push(skb, 1) = control_bits;
444
445 info->async_cb_type = MICROREAD_CB_TYPE_READER_ALL;
446 info->async_cb = cb;
447 info->async_cb_context = cb_context;
448
449 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
450 MICROREAD_CMD_MREAD_EXCHANGE,
451 skb->data, skb->len,
452 microread_im_transceive_cb, info);
453}
454
455static int microread_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
456{
457 int r;
458
459 r = nfc_hci_send_event(hdev, MICROREAD_GATE_ID_P2P_TARGET,
460 MICROREAD_EVT_MCARD_EXCHANGE,
461 skb->data, skb->len);
462
463 kfree_skb(skb);
464
465 return r;
466}
467
468static void microread_target_discovered(struct nfc_hci_dev *hdev, u8 gate,
469 struct sk_buff *skb)
470{
471 struct nfc_target *targets;
472 int r = 0;
473
474 pr_info("target discovered to gate 0x%x\n", gate);
475
476 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
477 if (targets == NULL) {
478 r = -ENOMEM;
479 goto exit;
480 }
481
482 targets->hci_reader_gate = gate;
483
484 switch (gate) {
485 case MICROREAD_GATE_ID_MREAD_ISO_A:
486 targets->supported_protocols =
487 nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A_SAK]);
488 targets->sens_res =
489 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A_ATQA]);
490 targets->sel_res = skb->data[MICROREAD_EMCF_A_SAK];
491 targets->nfcid1_len = skb->data[MICROREAD_EMCF_A_LEN];
492 if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
493 r = -EINVAL;
494 goto exit_free;
495 }
496 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A_UID],
497 targets->nfcid1_len);
498 break;
499 case MICROREAD_GATE_ID_MREAD_ISO_A_3:
500 targets->supported_protocols =
501 nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A3_SAK]);
502 targets->sens_res =
503 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A3_ATQA]);
504 targets->sel_res = skb->data[MICROREAD_EMCF_A3_SAK];
505 targets->nfcid1_len = skb->data[MICROREAD_EMCF_A3_LEN];
506 if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
507 r = -EINVAL;
508 goto exit_free;
509 }
510 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A3_UID],
511 targets->nfcid1_len);
512 break;
513 case MICROREAD_GATE_ID_MREAD_ISO_B:
514 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
515 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_B_UID], 4);
516 targets->nfcid1_len = 4;
517 break;
518 case MICROREAD_GATE_ID_MREAD_NFC_T1:
519 targets->supported_protocols = NFC_PROTO_JEWEL_MASK;
520 targets->sens_res =
521 le16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_T1_ATQA]);
522 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_T1_UID], 4);
523 targets->nfcid1_len = 4;
524 break;
525 case MICROREAD_GATE_ID_MREAD_NFC_T3:
526 targets->supported_protocols = NFC_PROTO_FELICA_MASK;
527 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_T3_UID], 8);
528 targets->nfcid1_len = 8;
529 break;
530 default:
531 pr_info("discard target discovered to gate 0x%x\n", gate);
532 goto exit_free;
533 }
534
535 r = nfc_targets_found(hdev->ndev, targets, 1);
536
537exit_free:
538 kfree(targets);
539
540exit:
541 kfree_skb(skb);
542
543 if (r)
544 pr_err("Failed to handle discovered target err=%d\n", r);
545}
546
547static int microread_event_received(struct nfc_hci_dev *hdev, u8 pipe,
548 u8 event, struct sk_buff *skb)
549{
550 int r;
551 u8 gate = hdev->pipes[pipe].gate;
552 u8 mode;
553
554 pr_info("Microread received event 0x%x to gate 0x%x\n", event, gate);
555
556 switch (event) {
557 case MICROREAD_EVT_MREAD_CARD_FOUND:
558 microread_target_discovered(hdev, gate, skb);
559 return 0;
560
561 case MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_FROM_RF:
562 if (skb->len < 1) {
563 kfree_skb(skb);
564 return -EPROTO;
565 }
566
567 if (skb->data[skb->len - 1]) {
568 kfree_skb(skb);
569 return -EIO;
570 }
571
572 skb_trim(skb, skb->len - 1);
573
574 r = nfc_tm_data_received(hdev->ndev, skb);
575 break;
576
577 case MICROREAD_EVT_MCARD_FIELD_ON:
578 case MICROREAD_EVT_MCARD_FIELD_OFF:
579 kfree_skb(skb);
580 return 0;
581
582 case MICROREAD_EVT_P2P_TARGET_ACTIVATED:
583 r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
584 NFC_COMM_PASSIVE, skb->data,
585 skb->len);
586
587 kfree_skb(skb);
588 break;
589
590 case MICROREAD_EVT_MCARD_EXCHANGE:
591 if (skb->len < 1) {
592 kfree_skb(skb);
593 return -EPROTO;
594 }
595
596 if (skb->data[skb->len-1]) {
597 kfree_skb(skb);
598 return -EIO;
599 }
600
601 skb_trim(skb, skb->len - 1);
602
603 r = nfc_tm_data_received(hdev->ndev, skb);
604 break;
605
606 case MICROREAD_EVT_P2P_TARGET_DEACTIVATED:
607 kfree_skb(skb);
608
609 mode = 0xff;
610 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
611 MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
612 if (r)
613 break;
614
615 r = nfc_hci_send_event(hdev, gate,
616 MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL,
617 0);
618 break;
619
620 default:
621 return 1;
622 }
623
624 return r;
625}
626
627static const struct nfc_hci_ops microread_hci_ops = {
628 .open = microread_open,
629 .close = microread_close,
630 .hci_ready = microread_hci_ready,
631 .xmit = microread_xmit,
632 .start_poll = microread_start_poll,
633 .dep_link_up = microread_dep_link_up,
634 .dep_link_down = microread_dep_link_down,
635 .target_from_gate = microread_target_from_gate,
636 .complete_target_discovered = microread_complete_target_discovered,
637 .im_transceive = microread_im_transceive,
638 .tm_send = microread_tm_send,
639 .check_presence = NULL,
640 .event_received = microread_event_received,
641};
642
643int microread_probe(void *phy_id, const struct nfc_phy_ops *phy_ops,
644 const char *llc_name, int phy_headroom, int phy_tailroom,
645 int phy_payload, struct nfc_hci_dev **hdev)
646{
647 struct microread_info *info;
648 unsigned long quirks = 0;
649 u32 protocols;
650 struct nfc_hci_init_data init_data;
651 int r;
652
653 info = kzalloc(sizeof(struct microread_info), GFP_KERNEL);
654 if (!info) {
655 r = -ENOMEM;
656 goto err_info_alloc;
657 }
658
659 info->phy_ops = phy_ops;
660 info->phy_id = phy_id;
661
662 init_data.gate_count = ARRAY_SIZE(microread_gates);
663 memcpy(init_data.gates, microread_gates, sizeof(microread_gates));
664
665 strcpy(init_data.session_id, "MICROREA");
666
667 set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
668
669 protocols = NFC_PROTO_JEWEL_MASK |
670 NFC_PROTO_MIFARE_MASK |
671 NFC_PROTO_FELICA_MASK |
672 NFC_PROTO_ISO14443_MASK |
673 NFC_PROTO_ISO14443_B_MASK |
674 NFC_PROTO_NFC_DEP_MASK;
675
676 info->hdev = nfc_hci_allocate_device(µread_hci_ops, &init_data,
677 quirks, protocols, llc_name,
678 phy_headroom +
679 MICROREAD_CMDS_HEADROOM,
680 phy_tailroom +
681 MICROREAD_CMD_TAILROOM,
682 phy_payload);
683 if (!info->hdev) {
684 pr_err("Cannot allocate nfc hdev\n");
685 r = -ENOMEM;
686 goto err_alloc_hdev;
687 }
688
689 nfc_hci_set_clientdata(info->hdev, info);
690
691 r = nfc_hci_register_device(info->hdev);
692 if (r)
693 goto err_regdev;
694
695 *hdev = info->hdev;
696
697 return 0;
698
699err_regdev:
700 nfc_hci_free_device(info->hdev);
701
702err_alloc_hdev:
703 kfree(info);
704
705err_info_alloc:
706 return r;
707}
708EXPORT_SYMBOL(microread_probe);
709
710void microread_remove(struct nfc_hci_dev *hdev)
711{
712 struct microread_info *info = nfc_hci_get_clientdata(hdev);
713
714 nfc_hci_unregister_device(hdev);
715 nfc_hci_free_device(hdev);
716 kfree(info);
717}
718EXPORT_SYMBOL(microread_remove);
719
720MODULE_LICENSE("GPL");
721MODULE_DESCRIPTION(DRIVER_DESC);
1/*
2 * HCI based Driver for Inside Secure microread NFC Chip
3 *
4 * Copyright (C) 2013 Intel Corporation. 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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/module.h>
22#include <linux/delay.h>
23#include <linux/slab.h>
24#include <linux/crc-ccitt.h>
25
26#include <linux/nfc.h>
27#include <net/nfc/nfc.h>
28#include <net/nfc/hci.h>
29#include <net/nfc/llc.h>
30
31#include "microread.h"
32
33/* Proprietary gates, events, commands and registers */
34/* Admin */
35#define MICROREAD_GATE_ID_ADM NFC_HCI_ADMIN_GATE
36#define MICROREAD_GATE_ID_MGT 0x01
37#define MICROREAD_GATE_ID_OS 0x02
38#define MICROREAD_GATE_ID_TESTRF 0x03
39#define MICROREAD_GATE_ID_LOOPBACK NFC_HCI_LOOPBACK_GATE
40#define MICROREAD_GATE_ID_IDT NFC_HCI_ID_MGMT_GATE
41#define MICROREAD_GATE_ID_LMS NFC_HCI_LINK_MGMT_GATE
42
43/* Reader */
44#define MICROREAD_GATE_ID_MREAD_GEN 0x10
45#define MICROREAD_GATE_ID_MREAD_ISO_B NFC_HCI_RF_READER_B_GATE
46#define MICROREAD_GATE_ID_MREAD_NFC_T1 0x12
47#define MICROREAD_GATE_ID_MREAD_ISO_A NFC_HCI_RF_READER_A_GATE
48#define MICROREAD_GATE_ID_MREAD_NFC_T3 0x14
49#define MICROREAD_GATE_ID_MREAD_ISO_15_3 0x15
50#define MICROREAD_GATE_ID_MREAD_ISO_15_2 0x16
51#define MICROREAD_GATE_ID_MREAD_ISO_B_3 0x17
52#define MICROREAD_GATE_ID_MREAD_BPRIME 0x18
53#define MICROREAD_GATE_ID_MREAD_ISO_A_3 0x19
54
55/* Card */
56#define MICROREAD_GATE_ID_MCARD_GEN 0x20
57#define MICROREAD_GATE_ID_MCARD_ISO_B 0x21
58#define MICROREAD_GATE_ID_MCARD_BPRIME 0x22
59#define MICROREAD_GATE_ID_MCARD_ISO_A 0x23
60#define MICROREAD_GATE_ID_MCARD_NFC_T3 0x24
61#define MICROREAD_GATE_ID_MCARD_ISO_15_3 0x25
62#define MICROREAD_GATE_ID_MCARD_ISO_15_2 0x26
63#define MICROREAD_GATE_ID_MCARD_ISO_B_2 0x27
64#define MICROREAD_GATE_ID_MCARD_ISO_CUSTOM 0x28
65#define MICROREAD_GATE_ID_SECURE_ELEMENT 0x2F
66
67/* P2P */
68#define MICROREAD_GATE_ID_P2P_GEN 0x30
69#define MICROREAD_GATE_ID_P2P_TARGET 0x31
70#define MICROREAD_PAR_P2P_TARGET_MODE 0x01
71#define MICROREAD_PAR_P2P_TARGET_GT 0x04
72#define MICROREAD_GATE_ID_P2P_INITIATOR 0x32
73#define MICROREAD_PAR_P2P_INITIATOR_GI 0x01
74#define MICROREAD_PAR_P2P_INITIATOR_GT 0x03
75
76/* Those pipes are created/opened by default in the chip */
77#define MICROREAD_PIPE_ID_LMS 0x00
78#define MICROREAD_PIPE_ID_ADMIN 0x01
79#define MICROREAD_PIPE_ID_MGT 0x02
80#define MICROREAD_PIPE_ID_OS 0x03
81#define MICROREAD_PIPE_ID_HDS_LOOPBACK 0x04
82#define MICROREAD_PIPE_ID_HDS_IDT 0x05
83#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_B 0x08
84#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_BPRIME 0x09
85#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_A 0x0A
86#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_15_3 0x0B
87#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_15_2 0x0C
88#define MICROREAD_PIPE_ID_HDS_MCARD_NFC_T3 0x0D
89#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_B_2 0x0E
90#define MICROREAD_PIPE_ID_HDS_MCARD_CUSTOM 0x0F
91#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_B 0x10
92#define MICROREAD_PIPE_ID_HDS_MREAD_NFC_T1 0x11
93#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_A 0x12
94#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_15_3 0x13
95#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_15_2 0x14
96#define MICROREAD_PIPE_ID_HDS_MREAD_NFC_T3 0x15
97#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_B_3 0x16
98#define MICROREAD_PIPE_ID_HDS_MREAD_BPRIME 0x17
99#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_A_3 0x18
100#define MICROREAD_PIPE_ID_HDS_MREAD_GEN 0x1B
101#define MICROREAD_PIPE_ID_HDS_STACKED_ELEMENT 0x1C
102#define MICROREAD_PIPE_ID_HDS_INSTANCES 0x1D
103#define MICROREAD_PIPE_ID_HDS_TESTRF 0x1E
104#define MICROREAD_PIPE_ID_HDS_P2P_TARGET 0x1F
105#define MICROREAD_PIPE_ID_HDS_P2P_INITIATOR 0x20
106
107/* Events */
108#define MICROREAD_EVT_MREAD_DISCOVERY_OCCURED NFC_HCI_EVT_TARGET_DISCOVERED
109#define MICROREAD_EVT_MREAD_CARD_FOUND 0x3D
110#define MICROREAD_EMCF_A_ATQA 0
111#define MICROREAD_EMCF_A_SAK 2
112#define MICROREAD_EMCF_A_LEN 3
113#define MICROREAD_EMCF_A_UID 4
114#define MICROREAD_EMCF_A3_ATQA 0
115#define MICROREAD_EMCF_A3_SAK 2
116#define MICROREAD_EMCF_A3_LEN 3
117#define MICROREAD_EMCF_A3_UID 4
118#define MICROREAD_EMCF_B_UID 0
119#define MICROREAD_EMCF_T1_ATQA 0
120#define MICROREAD_EMCF_T1_UID 4
121#define MICROREAD_EMCF_T3_UID 0
122#define MICROREAD_EVT_MREAD_DISCOVERY_START NFC_HCI_EVT_READER_REQUESTED
123#define MICROREAD_EVT_MREAD_DISCOVERY_START_SOME 0x3E
124#define MICROREAD_EVT_MREAD_DISCOVERY_STOP NFC_HCI_EVT_END_OPERATION
125#define MICROREAD_EVT_MREAD_SIM_REQUESTS 0x3F
126#define MICROREAD_EVT_MCARD_EXCHANGE NFC_HCI_EVT_TARGET_DISCOVERED
127#define MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_TO_RF 0x20
128#define MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_FROM_RF 0x21
129#define MICROREAD_EVT_MCARD_FIELD_ON 0x11
130#define MICROREAD_EVT_P2P_TARGET_ACTIVATED 0x13
131#define MICROREAD_EVT_P2P_TARGET_DEACTIVATED 0x12
132#define MICROREAD_EVT_MCARD_FIELD_OFF 0x14
133
134/* Commands */
135#define MICROREAD_CMD_MREAD_EXCHANGE 0x10
136#define MICROREAD_CMD_MREAD_SUBSCRIBE 0x3F
137
138/* Hosts IDs */
139#define MICROREAD_ELT_ID_HDS NFC_HCI_TERMINAL_HOST_ID
140#define MICROREAD_ELT_ID_SIM NFC_HCI_UICC_HOST_ID
141#define MICROREAD_ELT_ID_SE1 0x03
142#define MICROREAD_ELT_ID_SE2 0x04
143#define MICROREAD_ELT_ID_SE3 0x05
144
145static struct nfc_hci_gate microread_gates[] = {
146 {MICROREAD_GATE_ID_ADM, MICROREAD_PIPE_ID_ADMIN},
147 {MICROREAD_GATE_ID_LOOPBACK, MICROREAD_PIPE_ID_HDS_LOOPBACK},
148 {MICROREAD_GATE_ID_IDT, MICROREAD_PIPE_ID_HDS_IDT},
149 {MICROREAD_GATE_ID_LMS, MICROREAD_PIPE_ID_LMS},
150 {MICROREAD_GATE_ID_MREAD_ISO_B, MICROREAD_PIPE_ID_HDS_MREAD_ISO_B},
151 {MICROREAD_GATE_ID_MREAD_ISO_A, MICROREAD_PIPE_ID_HDS_MREAD_ISO_A},
152 {MICROREAD_GATE_ID_MREAD_ISO_A_3, MICROREAD_PIPE_ID_HDS_MREAD_ISO_A_3},
153 {MICROREAD_GATE_ID_MGT, MICROREAD_PIPE_ID_MGT},
154 {MICROREAD_GATE_ID_OS, MICROREAD_PIPE_ID_OS},
155 {MICROREAD_GATE_ID_MREAD_NFC_T1, MICROREAD_PIPE_ID_HDS_MREAD_NFC_T1},
156 {MICROREAD_GATE_ID_MREAD_NFC_T3, MICROREAD_PIPE_ID_HDS_MREAD_NFC_T3},
157 {MICROREAD_GATE_ID_P2P_TARGET, MICROREAD_PIPE_ID_HDS_P2P_TARGET},
158 {MICROREAD_GATE_ID_P2P_INITIATOR, MICROREAD_PIPE_ID_HDS_P2P_INITIATOR}
159};
160
161/* Largest headroom needed for outgoing custom commands */
162#define MICROREAD_CMDS_HEADROOM 2
163#define MICROREAD_CMD_TAILROOM 2
164
165struct microread_info {
166 struct nfc_phy_ops *phy_ops;
167 void *phy_id;
168
169 struct nfc_hci_dev *hdev;
170
171 int async_cb_type;
172 data_exchange_cb_t async_cb;
173 void *async_cb_context;
174};
175
176static int microread_open(struct nfc_hci_dev *hdev)
177{
178 struct microread_info *info = nfc_hci_get_clientdata(hdev);
179
180 return info->phy_ops->enable(info->phy_id);
181}
182
183static void microread_close(struct nfc_hci_dev *hdev)
184{
185 struct microread_info *info = nfc_hci_get_clientdata(hdev);
186
187 info->phy_ops->disable(info->phy_id);
188}
189
190static int microread_hci_ready(struct nfc_hci_dev *hdev)
191{
192 int r;
193 u8 param[4];
194
195 param[0] = 0x03;
196 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
197 MICROREAD_CMD_MREAD_SUBSCRIBE, param, 1, NULL);
198 if (r)
199 return r;
200
201 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_A_3,
202 MICROREAD_CMD_MREAD_SUBSCRIBE, NULL, 0, NULL);
203 if (r)
204 return r;
205
206 param[0] = 0x00;
207 param[1] = 0x03;
208 param[2] = 0x00;
209 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_B,
210 MICROREAD_CMD_MREAD_SUBSCRIBE, param, 3, NULL);
211 if (r)
212 return r;
213
214 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_NFC_T1,
215 MICROREAD_CMD_MREAD_SUBSCRIBE, NULL, 0, NULL);
216 if (r)
217 return r;
218
219 param[0] = 0xFF;
220 param[1] = 0xFF;
221 param[2] = 0x00;
222 param[3] = 0x00;
223 r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_NFC_T3,
224 MICROREAD_CMD_MREAD_SUBSCRIBE, param, 4, NULL);
225
226 return r;
227}
228
229static int microread_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
230{
231 struct microread_info *info = nfc_hci_get_clientdata(hdev);
232
233 return info->phy_ops->write(info->phy_id, skb);
234}
235
236static int microread_start_poll(struct nfc_hci_dev *hdev,
237 u32 im_protocols, u32 tm_protocols)
238{
239 int r;
240
241 u8 param[2];
242 u8 mode;
243
244 param[0] = 0x00;
245 param[1] = 0x00;
246
247 if (im_protocols & NFC_PROTO_ISO14443_MASK)
248 param[0] |= (1 << 2);
249
250 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
251 param[0] |= 1;
252
253 if (im_protocols & NFC_PROTO_MIFARE_MASK)
254 param[1] |= 1;
255
256 if (im_protocols & NFC_PROTO_JEWEL_MASK)
257 param[0] |= (1 << 1);
258
259 if (im_protocols & NFC_PROTO_FELICA_MASK)
260 param[0] |= (1 << 5);
261
262 if (im_protocols & NFC_PROTO_NFC_DEP_MASK)
263 param[1] |= (1 << 1);
264
265 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
266 hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
267 &hdev->gb_len);
268 if (hdev->gb == NULL || hdev->gb_len == 0) {
269 im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
270 tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
271 }
272 }
273
274 r = nfc_hci_send_event(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
275 MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL, 0);
276 if (r)
277 return r;
278
279 mode = 0xff;
280 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
281 MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
282 if (r)
283 return r;
284
285 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
286 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_INITIATOR,
287 MICROREAD_PAR_P2P_INITIATOR_GI,
288 hdev->gb, hdev->gb_len);
289 if (r)
290 return r;
291 }
292
293 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
294 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
295 MICROREAD_PAR_P2P_TARGET_GT,
296 hdev->gb, hdev->gb_len);
297 if (r)
298 return r;
299
300 mode = 0x02;
301 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
302 MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
303 if (r)
304 return r;
305 }
306
307 return nfc_hci_send_event(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
308 MICROREAD_EVT_MREAD_DISCOVERY_START_SOME,
309 param, 2);
310}
311
312static int microread_dep_link_up(struct nfc_hci_dev *hdev,
313 struct nfc_target *target, u8 comm_mode,
314 u8 *gb, size_t gb_len)
315{
316 struct sk_buff *rgb_skb = NULL;
317 int r;
318
319 r = nfc_hci_get_param(hdev, target->hci_reader_gate,
320 MICROREAD_PAR_P2P_INITIATOR_GT, &rgb_skb);
321 if (r < 0)
322 return r;
323
324 if (rgb_skb->len == 0 || rgb_skb->len > NFC_GB_MAXSIZE) {
325 r = -EPROTO;
326 goto exit;
327 }
328
329 r = nfc_set_remote_general_bytes(hdev->ndev, rgb_skb->data,
330 rgb_skb->len);
331 if (r == 0)
332 r = nfc_dep_link_is_up(hdev->ndev, target->idx, comm_mode,
333 NFC_RF_INITIATOR);
334exit:
335 kfree_skb(rgb_skb);
336
337 return r;
338}
339
340static int microread_dep_link_down(struct nfc_hci_dev *hdev)
341{
342 return nfc_hci_send_event(hdev, MICROREAD_GATE_ID_P2P_INITIATOR,
343 MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL, 0);
344}
345
346static int microread_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
347 struct nfc_target *target)
348{
349 switch (gate) {
350 case MICROREAD_GATE_ID_P2P_INITIATOR:
351 target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
352 break;
353 default:
354 return -EPROTO;
355 }
356
357 return 0;
358}
359
360static int microread_complete_target_discovered(struct nfc_hci_dev *hdev,
361 u8 gate,
362 struct nfc_target *target)
363{
364 return 0;
365}
366
367#define MICROREAD_CB_TYPE_READER_ALL 1
368
369static void microread_im_transceive_cb(void *context, struct sk_buff *skb,
370 int err)
371{
372 struct microread_info *info = context;
373
374 switch (info->async_cb_type) {
375 case MICROREAD_CB_TYPE_READER_ALL:
376 if (err == 0) {
377 if (skb->len == 0) {
378 err = -EPROTO;
379 kfree_skb(skb);
380 info->async_cb(info->async_cb_context, NULL,
381 -EPROTO);
382 return;
383 }
384
385 if (skb->data[skb->len - 1] != 0) {
386 err = nfc_hci_result_to_errno(
387 skb->data[skb->len - 1]);
388 kfree_skb(skb);
389 info->async_cb(info->async_cb_context, NULL,
390 err);
391 return;
392 }
393
394 skb_trim(skb, skb->len - 1); /* RF Error ind. */
395 }
396 info->async_cb(info->async_cb_context, skb, err);
397 break;
398 default:
399 if (err == 0)
400 kfree_skb(skb);
401 break;
402 }
403}
404
405/*
406 * Returns:
407 * <= 0: driver handled the data exchange
408 * 1: driver doesn't especially handle, please do standard processing
409 */
410static int microread_im_transceive(struct nfc_hci_dev *hdev,
411 struct nfc_target *target,
412 struct sk_buff *skb, data_exchange_cb_t cb,
413 void *cb_context)
414{
415 struct microread_info *info = nfc_hci_get_clientdata(hdev);
416 u8 control_bits;
417 u16 crc;
418
419 pr_info("data exchange to gate 0x%x\n", target->hci_reader_gate);
420
421 if (target->hci_reader_gate == MICROREAD_GATE_ID_P2P_INITIATOR) {
422 *(u8 *)skb_push(skb, 1) = 0;
423
424 return nfc_hci_send_event(hdev, target->hci_reader_gate,
425 MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_TO_RF,
426 skb->data, skb->len);
427 }
428
429 switch (target->hci_reader_gate) {
430 case MICROREAD_GATE_ID_MREAD_ISO_A:
431 control_bits = 0xCB;
432 break;
433 case MICROREAD_GATE_ID_MREAD_ISO_A_3:
434 control_bits = 0xCB;
435 break;
436 case MICROREAD_GATE_ID_MREAD_ISO_B:
437 control_bits = 0xCB;
438 break;
439 case MICROREAD_GATE_ID_MREAD_NFC_T1:
440 control_bits = 0x1B;
441
442 crc = crc_ccitt(0xffff, skb->data, skb->len);
443 crc = ~crc;
444 skb_put_u8(skb, crc & 0xff);
445 skb_put_u8(skb, crc >> 8);
446 break;
447 case MICROREAD_GATE_ID_MREAD_NFC_T3:
448 control_bits = 0xDB;
449 break;
450 default:
451 pr_info("Abort im_transceive to invalid gate 0x%x\n",
452 target->hci_reader_gate);
453 return 1;
454 }
455
456 *(u8 *)skb_push(skb, 1) = control_bits;
457
458 info->async_cb_type = MICROREAD_CB_TYPE_READER_ALL;
459 info->async_cb = cb;
460 info->async_cb_context = cb_context;
461
462 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
463 MICROREAD_CMD_MREAD_EXCHANGE,
464 skb->data, skb->len,
465 microread_im_transceive_cb, info);
466}
467
468static int microread_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
469{
470 int r;
471
472 r = nfc_hci_send_event(hdev, MICROREAD_GATE_ID_P2P_TARGET,
473 MICROREAD_EVT_MCARD_EXCHANGE,
474 skb->data, skb->len);
475
476 kfree_skb(skb);
477
478 return r;
479}
480
481static void microread_target_discovered(struct nfc_hci_dev *hdev, u8 gate,
482 struct sk_buff *skb)
483{
484 struct nfc_target *targets;
485 int r = 0;
486
487 pr_info("target discovered to gate 0x%x\n", gate);
488
489 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
490 if (targets == NULL) {
491 r = -ENOMEM;
492 goto exit;
493 }
494
495 targets->hci_reader_gate = gate;
496
497 switch (gate) {
498 case MICROREAD_GATE_ID_MREAD_ISO_A:
499 targets->supported_protocols =
500 nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A_SAK]);
501 targets->sens_res =
502 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A_ATQA]);
503 targets->sel_res = skb->data[MICROREAD_EMCF_A_SAK];
504 targets->nfcid1_len = skb->data[MICROREAD_EMCF_A_LEN];
505 if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
506 r = -EINVAL;
507 goto exit_free;
508 }
509 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A_UID],
510 targets->nfcid1_len);
511 break;
512 case MICROREAD_GATE_ID_MREAD_ISO_A_3:
513 targets->supported_protocols =
514 nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A3_SAK]);
515 targets->sens_res =
516 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A3_ATQA]);
517 targets->sel_res = skb->data[MICROREAD_EMCF_A3_SAK];
518 targets->nfcid1_len = skb->data[MICROREAD_EMCF_A3_LEN];
519 if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
520 r = -EINVAL;
521 goto exit_free;
522 }
523 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A3_UID],
524 targets->nfcid1_len);
525 break;
526 case MICROREAD_GATE_ID_MREAD_ISO_B:
527 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
528 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_B_UID], 4);
529 targets->nfcid1_len = 4;
530 break;
531 case MICROREAD_GATE_ID_MREAD_NFC_T1:
532 targets->supported_protocols = NFC_PROTO_JEWEL_MASK;
533 targets->sens_res =
534 le16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_T1_ATQA]);
535 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_T1_UID], 4);
536 targets->nfcid1_len = 4;
537 break;
538 case MICROREAD_GATE_ID_MREAD_NFC_T3:
539 targets->supported_protocols = NFC_PROTO_FELICA_MASK;
540 memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_T3_UID], 8);
541 targets->nfcid1_len = 8;
542 break;
543 default:
544 pr_info("discard target discovered to gate 0x%x\n", gate);
545 goto exit_free;
546 }
547
548 r = nfc_targets_found(hdev->ndev, targets, 1);
549
550exit_free:
551 kfree(targets);
552
553exit:
554 kfree_skb(skb);
555
556 if (r)
557 pr_err("Failed to handle discovered target err=%d\n", r);
558}
559
560static int microread_event_received(struct nfc_hci_dev *hdev, u8 pipe,
561 u8 event, struct sk_buff *skb)
562{
563 int r;
564 u8 gate = hdev->pipes[pipe].gate;
565 u8 mode;
566
567 pr_info("Microread received event 0x%x to gate 0x%x\n", event, gate);
568
569 switch (event) {
570 case MICROREAD_EVT_MREAD_CARD_FOUND:
571 microread_target_discovered(hdev, gate, skb);
572 return 0;
573
574 case MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_FROM_RF:
575 if (skb->len < 1) {
576 kfree_skb(skb);
577 return -EPROTO;
578 }
579
580 if (skb->data[skb->len - 1]) {
581 kfree_skb(skb);
582 return -EIO;
583 }
584
585 skb_trim(skb, skb->len - 1);
586
587 r = nfc_tm_data_received(hdev->ndev, skb);
588 break;
589
590 case MICROREAD_EVT_MCARD_FIELD_ON:
591 case MICROREAD_EVT_MCARD_FIELD_OFF:
592 kfree_skb(skb);
593 return 0;
594
595 case MICROREAD_EVT_P2P_TARGET_ACTIVATED:
596 r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
597 NFC_COMM_PASSIVE, skb->data,
598 skb->len);
599
600 kfree_skb(skb);
601 break;
602
603 case MICROREAD_EVT_MCARD_EXCHANGE:
604 if (skb->len < 1) {
605 kfree_skb(skb);
606 return -EPROTO;
607 }
608
609 if (skb->data[skb->len-1]) {
610 kfree_skb(skb);
611 return -EIO;
612 }
613
614 skb_trim(skb, skb->len - 1);
615
616 r = nfc_tm_data_received(hdev->ndev, skb);
617 break;
618
619 case MICROREAD_EVT_P2P_TARGET_DEACTIVATED:
620 kfree_skb(skb);
621
622 mode = 0xff;
623 r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
624 MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
625 if (r)
626 break;
627
628 r = nfc_hci_send_event(hdev, gate,
629 MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL,
630 0);
631 break;
632
633 default:
634 return 1;
635 }
636
637 return r;
638}
639
640static struct nfc_hci_ops microread_hci_ops = {
641 .open = microread_open,
642 .close = microread_close,
643 .hci_ready = microread_hci_ready,
644 .xmit = microread_xmit,
645 .start_poll = microread_start_poll,
646 .dep_link_up = microread_dep_link_up,
647 .dep_link_down = microread_dep_link_down,
648 .target_from_gate = microread_target_from_gate,
649 .complete_target_discovered = microread_complete_target_discovered,
650 .im_transceive = microread_im_transceive,
651 .tm_send = microread_tm_send,
652 .check_presence = NULL,
653 .event_received = microread_event_received,
654};
655
656int microread_probe(void *phy_id, struct nfc_phy_ops *phy_ops, char *llc_name,
657 int phy_headroom, int phy_tailroom, int phy_payload,
658 struct nfc_hci_dev **hdev)
659{
660 struct microread_info *info;
661 unsigned long quirks = 0;
662 u32 protocols;
663 struct nfc_hci_init_data init_data;
664 int r;
665
666 info = kzalloc(sizeof(struct microread_info), GFP_KERNEL);
667 if (!info) {
668 r = -ENOMEM;
669 goto err_info_alloc;
670 }
671
672 info->phy_ops = phy_ops;
673 info->phy_id = phy_id;
674
675 init_data.gate_count = ARRAY_SIZE(microread_gates);
676 memcpy(init_data.gates, microread_gates, sizeof(microread_gates));
677
678 strcpy(init_data.session_id, "MICROREA");
679
680 set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
681
682 protocols = NFC_PROTO_JEWEL_MASK |
683 NFC_PROTO_MIFARE_MASK |
684 NFC_PROTO_FELICA_MASK |
685 NFC_PROTO_ISO14443_MASK |
686 NFC_PROTO_ISO14443_B_MASK |
687 NFC_PROTO_NFC_DEP_MASK;
688
689 info->hdev = nfc_hci_allocate_device(µread_hci_ops, &init_data,
690 quirks, protocols, llc_name,
691 phy_headroom +
692 MICROREAD_CMDS_HEADROOM,
693 phy_tailroom +
694 MICROREAD_CMD_TAILROOM,
695 phy_payload);
696 if (!info->hdev) {
697 pr_err("Cannot allocate nfc hdev\n");
698 r = -ENOMEM;
699 goto err_alloc_hdev;
700 }
701
702 nfc_hci_set_clientdata(info->hdev, info);
703
704 r = nfc_hci_register_device(info->hdev);
705 if (r)
706 goto err_regdev;
707
708 *hdev = info->hdev;
709
710 return 0;
711
712err_regdev:
713 nfc_hci_free_device(info->hdev);
714
715err_alloc_hdev:
716 kfree(info);
717
718err_info_alloc:
719 return r;
720}
721EXPORT_SYMBOL(microread_probe);
722
723void microread_remove(struct nfc_hci_dev *hdev)
724{
725 struct microread_info *info = nfc_hci_get_clientdata(hdev);
726
727 nfc_hci_unregister_device(hdev);
728 nfc_hci_free_device(hdev);
729 kfree(info);
730}
731EXPORT_SYMBOL(microread_remove);
732
733MODULE_LICENSE("GPL");
734MODULE_DESCRIPTION(DRIVER_DESC);