blob: de6dd37d04c7065b9eb9f5186f735136048be335 [file] [log] [blame]
Thierry Escande4b10884eb2013-09-19 17:55:25 +02001/*
2 * NFC Digital Protocol stack
3 * Copyright (c) 2013, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 */
15
Samuel Ortizc5da0e42013-09-20 09:05:48 +020016#define pr_fmt(fmt) "digital: %s: " fmt, __func__
17
Thierry Escande4b10884eb2013-09-19 17:55:25 +020018#include <linux/module.h>
19
20#include "digital.h"
21
Thierry Escande59ee2362013-09-19 17:55:26 +020022#define DIGITAL_PROTO_NFCA_RF_TECH \
Shikha Singhce2e56c2015-11-20 06:40:19 -050023 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \
24 NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK)
Thierry Escande59ee2362013-09-19 17:55:26 +020025
Mark A. Greer24734602014-03-31 17:36:38 -070026#define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
27
Thierry Escande7d0911c2013-09-19 17:55:29 +020028#define DIGITAL_PROTO_NFCF_RF_TECH \
29 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
Thierry Escande8c0695e42013-09-19 17:55:28 +020030
Mark A. Greera381d482014-01-21 16:23:59 -070031#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
32
Thierry Escande7854a442016-06-07 16:21:52 +020033/* Delay between each poll frame (ms) */
34#define DIGITAL_POLL_INTERVAL 10
35
Thierry Escande59ee2362013-09-19 17:55:26 +020036struct digital_cmd {
37 struct list_head queue;
38
39 u8 type;
40 u8 pending;
41
42 u16 timeout;
43 struct sk_buff *req;
44 struct sk_buff *resp;
Thierry Escande1c7a4c22013-09-19 17:55:30 +020045 struct digital_tg_mdaa_params *mdaa_params;
Thierry Escande59ee2362013-09-19 17:55:26 +020046
47 nfc_digital_cmd_complete_t cmd_cb;
48 void *cb_context;
49};
50
51struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
52 unsigned int len)
53{
54 struct sk_buff *skb;
55
56 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
57 GFP_KERNEL);
58 if (skb)
59 skb_reserve(skb, ddev->tx_headroom);
60
61 return skb;
62}
63
Thierry Escande2c66dae2013-09-19 17:55:27 +020064void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
65 u8 bitwise_inv, u8 msb_first)
66{
67 u16 crc;
68
69 crc = crc_func(init, skb->data, skb->len);
70
71 if (bitwise_inv)
72 crc = ~crc;
73
74 if (msb_first)
75 crc = __fswab16(crc);
76
Johannes Berg634fef62017-06-16 14:29:24 +020077 skb_put_u8(skb, crc & 0xFF);
78 skb_put_u8(skb, (crc >> 8) & 0xFF);
Thierry Escande2c66dae2013-09-19 17:55:27 +020079}
80
81int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
82 u16 crc_init, u8 bitwise_inv, u8 msb_first)
83{
84 int rc;
85 u16 crc;
86
87 if (skb->len <= 2)
88 return -EIO;
89
90 crc = crc_func(crc_init, skb->data, skb->len - 2);
91
92 if (bitwise_inv)
93 crc = ~crc;
94
95 if (msb_first)
96 crc = __swab16(crc);
97
98 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
99 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
100
101 if (rc)
102 return -EIO;
103
104 skb_trim(skb, skb->len - 2);
105
106 return 0;
107}
108
Thierry Escande59ee2362013-09-19 17:55:26 +0200109static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
110{
111 ddev->ops->switch_rf(ddev, on);
112}
113
114static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
115{
116 ddev->ops->abort_cmd(ddev);
117}
118
119static void digital_wq_cmd_complete(struct work_struct *work)
120{
121 struct digital_cmd *cmd;
122 struct nfc_digital_dev *ddev = container_of(work,
123 struct nfc_digital_dev,
124 cmd_complete_work);
125
126 mutex_lock(&ddev->cmd_lock);
127
128 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
129 queue);
130 if (!cmd) {
131 mutex_unlock(&ddev->cmd_lock);
132 return;
133 }
134
135 list_del(&cmd->queue);
136
137 mutex_unlock(&ddev->cmd_lock);
138
139 if (!IS_ERR(cmd->resp))
140 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
141 cmd->resp->data, cmd->resp->len, false);
142
143 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
144
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200145 kfree(cmd->mdaa_params);
Thierry Escande59ee2362013-09-19 17:55:26 +0200146 kfree(cmd);
147
148 schedule_work(&ddev->cmd_work);
149}
150
151static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
152 void *arg, struct sk_buff *resp)
153{
154 struct digital_cmd *cmd = arg;
155
156 cmd->resp = resp;
157
158 schedule_work(&ddev->cmd_complete_work);
159}
160
161static void digital_wq_cmd(struct work_struct *work)
162{
163 int rc;
164 struct digital_cmd *cmd;
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200165 struct digital_tg_mdaa_params *params;
Thierry Escande59ee2362013-09-19 17:55:26 +0200166 struct nfc_digital_dev *ddev = container_of(work,
167 struct nfc_digital_dev,
168 cmd_work);
169
170 mutex_lock(&ddev->cmd_lock);
171
172 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
173 queue);
174 if (!cmd || cmd->pending) {
175 mutex_unlock(&ddev->cmd_lock);
176 return;
177 }
178
Thierry Escandeaf66df02016-06-16 20:24:44 +0200179 cmd->pending = 1;
180
Thierry Escande59ee2362013-09-19 17:55:26 +0200181 mutex_unlock(&ddev->cmd_lock);
182
183 if (cmd->req)
184 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
185 cmd->req->data, cmd->req->len, false);
186
187 switch (cmd->type) {
188 case DIGITAL_CMD_IN_SEND:
189 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
190 digital_send_cmd_complete, cmd);
191 break;
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200192
193 case DIGITAL_CMD_TG_SEND:
194 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
195 digital_send_cmd_complete, cmd);
196 break;
197
198 case DIGITAL_CMD_TG_LISTEN:
199 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
200 digital_send_cmd_complete, cmd);
201 break;
202
203 case DIGITAL_CMD_TG_LISTEN_MDAA:
204 params = cmd->mdaa_params;
205
206 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
207 digital_send_cmd_complete, cmd);
208 break;
209
Mark A. Greerbf30a672014-07-21 21:24:39 -0700210 case DIGITAL_CMD_TG_LISTEN_MD:
211 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
212 digital_send_cmd_complete, cmd);
213 break;
214
Thierry Escande59ee2362013-09-19 17:55:26 +0200215 default:
Samuel Ortiz26042532013-09-20 16:56:40 +0200216 pr_err("Unknown cmd type %d\n", cmd->type);
Thierry Escande59ee2362013-09-19 17:55:26 +0200217 return;
218 }
219
220 if (!rc)
221 return;
222
Samuel Ortiz26042532013-09-20 16:56:40 +0200223 pr_err("in_send_command returned err %d\n", rc);
Thierry Escande59ee2362013-09-19 17:55:26 +0200224
225 mutex_lock(&ddev->cmd_lock);
226 list_del(&cmd->queue);
227 mutex_unlock(&ddev->cmd_lock);
228
229 kfree_skb(cmd->req);
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200230 kfree(cmd->mdaa_params);
Thierry Escande59ee2362013-09-19 17:55:26 +0200231 kfree(cmd);
232
233 schedule_work(&ddev->cmd_work);
234}
235
236int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200237 struct sk_buff *skb, struct digital_tg_mdaa_params *params,
238 u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
239 void *cb_context)
Thierry Escande59ee2362013-09-19 17:55:26 +0200240{
241 struct digital_cmd *cmd;
242
Markus Elfringae72c992017-05-22 14:11:01 +0200243 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
Thierry Escande59ee2362013-09-19 17:55:26 +0200244 if (!cmd)
245 return -ENOMEM;
246
247 cmd->type = cmd_type;
248 cmd->timeout = timeout;
249 cmd->req = skb;
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200250 cmd->mdaa_params = params;
Thierry Escande59ee2362013-09-19 17:55:26 +0200251 cmd->cmd_cb = cmd_cb;
252 cmd->cb_context = cb_context;
253 INIT_LIST_HEAD(&cmd->queue);
254
255 mutex_lock(&ddev->cmd_lock);
256 list_add_tail(&cmd->queue, &ddev->cmd_queue);
257 mutex_unlock(&ddev->cmd_lock);
258
259 schedule_work(&ddev->cmd_work);
260
261 return 0;
262}
263
264int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
265{
266 int rc;
267
268 rc = ddev->ops->in_configure_hw(ddev, type, param);
269 if (rc)
Samuel Ortiz26042532013-09-20 16:56:40 +0200270 pr_err("in_configure_hw failed: %d\n", rc);
Thierry Escande59ee2362013-09-19 17:55:26 +0200271
272 return rc;
273}
274
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200275int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
276{
277 int rc;
278
279 rc = ddev->ops->tg_configure_hw(ddev, type, param);
280 if (rc)
Samuel Ortiz26042532013-09-20 16:56:40 +0200281 pr_err("tg_configure_hw failed: %d\n", rc);
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200282
283 return rc;
284}
285
286static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
287{
288 struct digital_tg_mdaa_params *params;
289
Markus Elfringae72c992017-05-22 14:11:01 +0200290 params = kzalloc(sizeof(*params), GFP_KERNEL);
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200291 if (!params)
292 return -ENOMEM;
293
294 params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
295 get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
296 params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
297
298 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
299 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
300 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
301 params->sc = DIGITAL_SENSF_FELICA_SC;
302
303 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
304 500, digital_tg_recv_atr_req, NULL);
305}
306
Mark A. Greerbf30a672014-07-21 21:24:39 -0700307static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
308{
309 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
310 digital_tg_recv_md_req, NULL);
311}
312
Thierry Escande2c66dae2013-09-19 17:55:27 +0200313int digital_target_found(struct nfc_digital_dev *ddev,
314 struct nfc_target *target, u8 protocol)
315{
316 int rc;
317 u8 framing;
318 u8 rf_tech;
Mark A. Greer0529a7a2014-07-02 09:03:49 -0700319 u8 poll_tech_count;
Thierry Escande2c66dae2013-09-19 17:55:27 +0200320 int (*check_crc)(struct sk_buff *skb);
321 void (*add_crc)(struct sk_buff *skb);
322
323 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
324
325 switch (protocol) {
326 case NFC_PROTO_JEWEL:
327 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
328 check_crc = digital_skb_check_crc_b;
329 add_crc = digital_skb_add_crc_b;
330 break;
331
332 case NFC_PROTO_MIFARE:
333 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
334 check_crc = digital_skb_check_crc_a;
335 add_crc = digital_skb_add_crc_a;
336 break;
337
Thierry Escande8c0695e42013-09-19 17:55:28 +0200338 case NFC_PROTO_FELICA:
339 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
340 check_crc = digital_skb_check_crc_f;
341 add_crc = digital_skb_add_crc_f;
342 break;
343
Thierry Escande7d0911c2013-09-19 17:55:29 +0200344 case NFC_PROTO_NFC_DEP:
345 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
346 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
347 check_crc = digital_skb_check_crc_a;
348 add_crc = digital_skb_add_crc_a;
349 } else {
350 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
351 check_crc = digital_skb_check_crc_f;
352 add_crc = digital_skb_add_crc_f;
353 }
354 break;
355
Mark A. Greera381d482014-01-21 16:23:59 -0700356 case NFC_PROTO_ISO15693:
Mark A. Greerceeee422014-03-06 07:39:19 -0700357 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
Mark A. Greera381d482014-01-21 16:23:59 -0700358 check_crc = digital_skb_check_crc_b;
359 add_crc = digital_skb_add_crc_b;
Thierry Escande564af142014-02-12 12:13:23 +0100360 break;
Thierry Escande12e3d242014-01-27 00:31:31 +0100361
362 case NFC_PROTO_ISO14443:
363 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
364 check_crc = digital_skb_check_crc_a;
365 add_crc = digital_skb_add_crc_a;
Mark A. Greera381d482014-01-21 16:23:59 -0700366 break;
367
Mark A. Greer24734602014-03-31 17:36:38 -0700368 case NFC_PROTO_ISO14443_B:
369 framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
370 check_crc = digital_skb_check_crc_b;
371 add_crc = digital_skb_add_crc_b;
372 break;
373
Thierry Escande2c66dae2013-09-19 17:55:27 +0200374 default:
Samuel Ortiz26042532013-09-20 16:56:40 +0200375 pr_err("Invalid protocol %d\n", protocol);
Thierry Escande2c66dae2013-09-19 17:55:27 +0200376 return -EINVAL;
377 }
378
Samuel Ortiz26042532013-09-20 16:56:40 +0200379 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
Thierry Escande2c66dae2013-09-19 17:55:27 +0200380
381 ddev->curr_rf_tech = rf_tech;
Thierry Escande2c66dae2013-09-19 17:55:27 +0200382
383 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
384 ddev->skb_add_crc = digital_skb_add_crc_none;
385 ddev->skb_check_crc = digital_skb_check_crc_none;
386 } else {
387 ddev->skb_add_crc = add_crc;
388 ddev->skb_check_crc = check_crc;
389 }
390
391 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
392 if (rc)
393 return rc;
394
395 target->supported_protocols = (1 << protocol);
Thierry Escande2c66dae2013-09-19 17:55:27 +0200396
Mark A. Greer0529a7a2014-07-02 09:03:49 -0700397 poll_tech_count = ddev->poll_tech_count;
Thierry Escande2c66dae2013-09-19 17:55:27 +0200398 ddev->poll_tech_count = 0;
399
Mark A. Greer0529a7a2014-07-02 09:03:49 -0700400 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
401 if (rc) {
402 ddev->poll_tech_count = poll_tech_count;
403 return rc;
404 }
405
Thierry Escande2c66dae2013-09-19 17:55:27 +0200406 return 0;
407}
408
Thierry Escande59ee2362013-09-19 17:55:26 +0200409void digital_poll_next_tech(struct nfc_digital_dev *ddev)
410{
Thierry Escande9dc33702014-05-10 13:06:02 +0200411 u8 rand_mod;
412
Thierry Escande59ee2362013-09-19 17:55:26 +0200413 digital_switch_rf(ddev, 0);
414
415 mutex_lock(&ddev->poll_lock);
416
417 if (!ddev->poll_tech_count) {
418 mutex_unlock(&ddev->poll_lock);
419 return;
420 }
421
Thierry Escande9dc33702014-05-10 13:06:02 +0200422 get_random_bytes(&rand_mod, sizeof(rand_mod));
423 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
Thierry Escande59ee2362013-09-19 17:55:26 +0200424
425 mutex_unlock(&ddev->poll_lock);
426
Thierry Escande7854a442016-06-07 16:21:52 +0200427 schedule_delayed_work(&ddev->poll_work,
428 msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
Thierry Escande59ee2362013-09-19 17:55:26 +0200429}
430
431static void digital_wq_poll(struct work_struct *work)
432{
433 int rc;
434 struct digital_poll_tech *poll_tech;
435 struct nfc_digital_dev *ddev = container_of(work,
436 struct nfc_digital_dev,
Thierry Escande7854a442016-06-07 16:21:52 +0200437 poll_work.work);
Thierry Escande59ee2362013-09-19 17:55:26 +0200438 mutex_lock(&ddev->poll_lock);
439
440 if (!ddev->poll_tech_count) {
441 mutex_unlock(&ddev->poll_lock);
442 return;
443 }
444
445 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
446
447 mutex_unlock(&ddev->poll_lock);
448
449 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
450 if (rc)
451 digital_poll_next_tech(ddev);
452}
453
454static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
455 digital_poll_t poll_func)
456{
457 struct digital_poll_tech *poll_tech;
458
459 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
460 return;
461
462 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
463
464 poll_tech->rf_tech = rf_tech;
465 poll_tech->poll_func = poll_func;
466}
467
468/**
469 * start_poll operation
470 *
471 * For every supported protocol, the corresponding polling function is added
472 * to the table of polling technologies (ddev->poll_techs[]) using
473 * digital_add_poll_tech().
474 * When a polling function fails (by timeout or protocol error) the next one is
475 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
476 */
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200477static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
478 __u32 tm_protocols)
479{
Thierry Escande59ee2362013-09-19 17:55:26 +0200480 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
481 u32 matching_im_protocols, matching_tm_protocols;
482
Samuel Ortiz26042532013-09-20 16:56:40 +0200483 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
Samuel Ortizc5da0e42013-09-20 09:05:48 +0200484 tm_protocols, ddev->protocols);
Thierry Escande59ee2362013-09-19 17:55:26 +0200485
486 matching_im_protocols = ddev->protocols & im_protocols;
487 matching_tm_protocols = ddev->protocols & tm_protocols;
488
489 if (!matching_im_protocols && !matching_tm_protocols) {
Samuel Ortiz26042532013-09-20 16:56:40 +0200490 pr_err("Unknown protocol\n");
Thierry Escande59ee2362013-09-19 17:55:26 +0200491 return -EINVAL;
492 }
493
494 if (ddev->poll_tech_count) {
Samuel Ortiz26042532013-09-20 16:56:40 +0200495 pr_err("Already polling\n");
Thierry Escande59ee2362013-09-19 17:55:26 +0200496 return -EBUSY;
497 }
498
499 if (ddev->curr_protocol) {
Samuel Ortiz26042532013-09-20 16:56:40 +0200500 pr_err("A target is already active\n");
Thierry Escande59ee2362013-09-19 17:55:26 +0200501 return -EBUSY;
502 }
503
504 ddev->poll_tech_count = 0;
505 ddev->poll_tech_index = 0;
506
507 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
508 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
509 digital_in_send_sens_req);
510
Mark A. Greer24734602014-03-31 17:36:38 -0700511 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
512 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
513 digital_in_send_sensb_req);
514
Axel Lin4f913d42014-02-22 10:16:11 +0800515 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
Thierry Escande8c0695e42013-09-19 17:55:28 +0200516 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
517 digital_in_send_sensf_req);
518
519 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
520 digital_in_send_sensf_req);
521 }
522
Mark A. Greera381d482014-01-21 16:23:59 -0700523 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
524 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
525 digital_in_send_iso15693_inv_req);
526
Axel Lin4f913d42014-02-22 10:16:11 +0800527 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200528 if (ddev->ops->tg_listen_mdaa) {
529 digital_add_poll_tech(ddev, 0,
530 digital_tg_listen_mdaa);
Mark A. Greerbf30a672014-07-21 21:24:39 -0700531 } else if (ddev->ops->tg_listen_md) {
532 digital_add_poll_tech(ddev, 0,
533 digital_tg_listen_md);
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200534 } else {
535 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
536 digital_tg_listen_nfca);
537
538 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
539 digital_tg_listen_nfcf);
540
541 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
542 digital_tg_listen_nfcf);
543 }
544 }
545
Thierry Escande59ee2362013-09-19 17:55:26 +0200546 if (!ddev->poll_tech_count) {
Samuel Ortiz26042532013-09-20 16:56:40 +0200547 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
Thierry Escande59ee2362013-09-19 17:55:26 +0200548 matching_im_protocols, matching_tm_protocols);
549 return -EINVAL;
550 }
551
Thierry Escande7854a442016-06-07 16:21:52 +0200552 schedule_delayed_work(&ddev->poll_work, 0);
Thierry Escande59ee2362013-09-19 17:55:26 +0200553
554 return 0;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200555}
556
557static void digital_stop_poll(struct nfc_dev *nfc_dev)
558{
Thierry Escande59ee2362013-09-19 17:55:26 +0200559 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
560
561 mutex_lock(&ddev->poll_lock);
562
563 if (!ddev->poll_tech_count) {
Samuel Ortiz26042532013-09-20 16:56:40 +0200564 pr_err("Polling operation was not running\n");
Thierry Escande59ee2362013-09-19 17:55:26 +0200565 mutex_unlock(&ddev->poll_lock);
566 return;
567 }
568
569 ddev->poll_tech_count = 0;
570
571 mutex_unlock(&ddev->poll_lock);
572
Thierry Escande7854a442016-06-07 16:21:52 +0200573 cancel_delayed_work_sync(&ddev->poll_work);
Thierry Escande59ee2362013-09-19 17:55:26 +0200574
575 digital_abort_cmd(ddev);
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200576}
577
578static int digital_dev_up(struct nfc_dev *nfc_dev)
579{
Thierry Escande59ee2362013-09-19 17:55:26 +0200580 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
581
582 digital_switch_rf(ddev, 1);
583
584 return 0;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200585}
586
587static int digital_dev_down(struct nfc_dev *nfc_dev)
588{
Thierry Escande59ee2362013-09-19 17:55:26 +0200589 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
590
591 digital_switch_rf(ddev, 0);
592
593 return 0;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200594}
595
596static int digital_dep_link_up(struct nfc_dev *nfc_dev,
597 struct nfc_target *target,
598 __u8 comm_mode, __u8 *gb, size_t gb_len)
599{
Thierry Escande7d0911c2013-09-19 17:55:29 +0200600 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
Thierry Escande48e10442014-01-06 23:34:37 +0100601 int rc;
Thierry Escande7d0911c2013-09-19 17:55:29 +0200602
Thierry Escande48e10442014-01-06 23:34:37 +0100603 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
604
605 if (!rc)
606 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
607
608 return rc;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200609}
610
611static int digital_dep_link_down(struct nfc_dev *nfc_dev)
612{
Thierry Escande7d0911c2013-09-19 17:55:29 +0200613 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
614
Thierry Escande3cc952d2016-06-16 20:24:45 +0200615 digital_abort_cmd(ddev);
616
Thierry Escande7d0911c2013-09-19 17:55:29 +0200617 ddev->curr_protocol = 0;
618
619 return 0;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200620}
621
622static int digital_activate_target(struct nfc_dev *nfc_dev,
623 struct nfc_target *target, __u32 protocol)
624{
Thierry Escande48e10442014-01-06 23:34:37 +0100625 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
626
627 if (ddev->poll_tech_count) {
628 pr_err("Can't activate a target while polling\n");
629 return -EBUSY;
630 }
631
632 if (ddev->curr_protocol) {
633 pr_err("A target is already active\n");
634 return -EBUSY;
635 }
636
637 ddev->curr_protocol = protocol;
638
Thierry Escande59ee2362013-09-19 17:55:26 +0200639 return 0;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200640}
641
642static void digital_deactivate_target(struct nfc_dev *nfc_dev,
Christophe Ricard96d45812015-10-25 22:54:43 +0100643 struct nfc_target *target,
644 u8 mode)
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200645{
Thierry Escande59ee2362013-09-19 17:55:26 +0200646 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
647
Thierry Escande48e10442014-01-06 23:34:37 +0100648 if (!ddev->curr_protocol) {
649 pr_err("No active target\n");
650 return;
651 }
652
Thierry Escande59ee2362013-09-19 17:55:26 +0200653 ddev->curr_protocol = 0;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200654}
655
656static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
657{
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200658 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
659
660 return digital_tg_send_dep_res(ddev, skb);
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200661}
662
Thierry Escande2c66dae2013-09-19 17:55:27 +0200663static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
664 struct sk_buff *resp)
665{
666 struct digital_data_exch *data_exch = arg;
667 int rc;
668
669 if (IS_ERR(resp)) {
670 rc = PTR_ERR(resp);
Thierry Escandec8130072014-01-27 00:31:32 +0100671 resp = NULL;
Thierry Escande2c66dae2013-09-19 17:55:27 +0200672 goto done;
673 }
674
Thierry Escandec8130072014-01-27 00:31:32 +0100675 if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
Thierry Escande2c66dae2013-09-19 17:55:27 +0200676 rc = digital_in_recv_mifare_res(resp);
Thierry Escandec8130072014-01-27 00:31:32 +0100677 /* crc check is done in digital_in_recv_mifare_res() */
678 goto done;
679 }
Thierry Escande2c66dae2013-09-19 17:55:27 +0200680
Mark A. Greer24734602014-03-31 17:36:38 -0700681 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
682 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
Thierry Escandec8130072014-01-27 00:31:32 +0100683 rc = digital_in_iso_dep_pull_sod(ddev, resp);
684 if (rc)
685 goto done;
686 }
687
688 rc = ddev->skb_check_crc(resp);
689
690done:
Thierry Escande2c66dae2013-09-19 17:55:27 +0200691 if (rc) {
692 kfree_skb(resp);
693 resp = NULL;
694 }
695
Thierry Escande2c66dae2013-09-19 17:55:27 +0200696 data_exch->cb(data_exch->cb_context, resp, rc);
697
698 kfree(data_exch);
699}
700
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200701static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
702 struct sk_buff *skb, data_exchange_cb_t cb,
703 void *cb_context)
704{
Thierry Escande2c66dae2013-09-19 17:55:27 +0200705 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
706 struct digital_data_exch *data_exch;
Thierry Escandec8130072014-01-27 00:31:32 +0100707 int rc;
Thierry Escande2c66dae2013-09-19 17:55:27 +0200708
Markus Elfringae72c992017-05-22 14:11:01 +0200709 data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL);
Markus Elfringdcfca272017-05-22 14:24:24 +0200710 if (!data_exch)
Thierry Escande2c66dae2013-09-19 17:55:27 +0200711 return -ENOMEM;
Thierry Escande2c66dae2013-09-19 17:55:27 +0200712
713 data_exch->cb = cb;
714 data_exch->cb_context = cb_context;
715
Thierry Escande6ea73982014-02-12 14:27:51 +0100716 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
717 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
718 goto exit;
719 }
Thierry Escande7d0911c2013-09-19 17:55:29 +0200720
Mark A. Greer24734602014-03-31 17:36:38 -0700721 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
722 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
Thierry Escandec8130072014-01-27 00:31:32 +0100723 rc = digital_in_iso_dep_push_sod(ddev, skb);
724 if (rc)
Thierry Escande6ea73982014-02-12 14:27:51 +0100725 goto exit;
Thierry Escandec8130072014-01-27 00:31:32 +0100726 }
727
Thierry Escande2c66dae2013-09-19 17:55:27 +0200728 ddev->skb_add_crc(skb);
729
Thierry Escande6ea73982014-02-12 14:27:51 +0100730 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
731 data_exch);
732
733exit:
734 if (rc)
735 kfree(data_exch);
736
737 return rc;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200738}
739
740static struct nfc_ops digital_nfc_ops = {
741 .dev_up = digital_dev_up,
742 .dev_down = digital_dev_down,
743 .start_poll = digital_start_poll,
744 .stop_poll = digital_stop_poll,
745 .dep_link_up = digital_dep_link_up,
746 .dep_link_down = digital_dep_link_down,
747 .activate_target = digital_activate_target,
748 .deactivate_target = digital_deactivate_target,
749 .tm_send = digital_tg_send,
750 .im_transceive = digital_in_send,
751};
752
753struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
754 __u32 supported_protocols,
755 __u32 driver_capabilities,
756 int tx_headroom, int tx_tailroom)
757{
758 struct nfc_digital_dev *ddev;
759
760 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
761 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
Mark A. Greerbf30a672014-07-21 21:24:39 -0700762 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200763 return NULL;
764
Markus Elfringae72c992017-05-22 14:11:01 +0200765 ddev = kzalloc(sizeof(*ddev), GFP_KERNEL);
Samuel Ortiz26042532013-09-20 16:56:40 +0200766 if (!ddev)
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200767 return NULL;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200768
769 ddev->driver_capabilities = driver_capabilities;
770 ddev->ops = ops;
771
Thierry Escande59ee2362013-09-19 17:55:26 +0200772 mutex_init(&ddev->cmd_lock);
773 INIT_LIST_HEAD(&ddev->cmd_queue);
774
775 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
776 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
777
778 mutex_init(&ddev->poll_lock);
Thierry Escande7854a442016-06-07 16:21:52 +0200779 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
Thierry Escande59ee2362013-09-19 17:55:26 +0200780
781 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
782 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
783 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
784 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
Thierry Escande8c0695e42013-09-19 17:55:28 +0200785 if (supported_protocols & NFC_PROTO_FELICA_MASK)
786 ddev->protocols |= NFC_PROTO_FELICA_MASK;
Thierry Escande7d0911c2013-09-19 17:55:29 +0200787 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
788 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
Mark A. Greera381d482014-01-21 16:23:59 -0700789 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
790 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
Thierry Escande12e3d242014-01-27 00:31:31 +0100791 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
792 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
Mark A. Greer24734602014-03-31 17:36:38 -0700793 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
794 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
Thierry Escande59ee2362013-09-19 17:55:26 +0200795
796 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
797 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200798
799 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
800 ddev->tx_headroom,
801 ddev->tx_tailroom);
802 if (!ddev->nfc_dev) {
Samuel Ortiz26042532013-09-20 16:56:40 +0200803 pr_err("nfc_allocate_device failed\n");
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200804 goto free_dev;
805 }
806
807 nfc_set_drvdata(ddev->nfc_dev, ddev);
808
809 return ddev;
810
811free_dev:
812 kfree(ddev);
813
814 return NULL;
815}
816EXPORT_SYMBOL(nfc_digital_allocate_device);
817
818void nfc_digital_free_device(struct nfc_digital_dev *ddev)
819{
820 nfc_free_device(ddev->nfc_dev);
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200821 kfree(ddev);
822}
823EXPORT_SYMBOL(nfc_digital_free_device);
824
825int nfc_digital_register_device(struct nfc_digital_dev *ddev)
826{
827 return nfc_register_device(ddev->nfc_dev);
828}
829EXPORT_SYMBOL(nfc_digital_register_device);
830
831void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
832{
Thierry Escande59ee2362013-09-19 17:55:26 +0200833 struct digital_cmd *cmd, *n;
834
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200835 nfc_unregister_device(ddev->nfc_dev);
Thierry Escande59ee2362013-09-19 17:55:26 +0200836
837 mutex_lock(&ddev->poll_lock);
838 ddev->poll_tech_count = 0;
839 mutex_unlock(&ddev->poll_lock);
840
Thierry Escande7854a442016-06-07 16:21:52 +0200841 cancel_delayed_work_sync(&ddev->poll_work);
Thierry Escande59ee2362013-09-19 17:55:26 +0200842 cancel_work_sync(&ddev->cmd_work);
843 cancel_work_sync(&ddev->cmd_complete_work);
844
845 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
846 list_del(&cmd->queue);
Thierry Escande82e57952016-06-16 20:24:43 +0200847
848 /* Call the command callback if any and pass it a ENODEV error.
849 * This gives a chance to the command issuer to free any
850 * allocated buffer.
851 */
852 if (cmd->cmd_cb)
853 cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV));
854
Thierry Escande1c7a4c22013-09-19 17:55:30 +0200855 kfree(cmd->mdaa_params);
Thierry Escande59ee2362013-09-19 17:55:26 +0200856 kfree(cmd);
857 }
Thierry Escande4b10884eb2013-09-19 17:55:25 +0200858}
859EXPORT_SYMBOL(nfc_digital_unregister_device);
860
861MODULE_LICENSE("GPL");