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1/*
2 * NFC hardware simulation driver
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
16#include <linux/device.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/nfc.h>
20#include <net/nfc/nfc.h>
21
22#define DEV_ERR(_dev, fmt, args...) nfc_err(&_dev->nfc_dev->dev, \
23 "%s: " fmt, __func__, ## args)
24
25#define DEV_DBG(_dev, fmt, args...) dev_dbg(&_dev->nfc_dev->dev, \
26 "%s: " fmt, __func__, ## args)
27
28#define NFCSIM_VERSION "0.1"
29
30#define NFCSIM_POLL_NONE 0
31#define NFCSIM_POLL_INITIATOR 1
32#define NFCSIM_POLL_TARGET 2
33#define NFCSIM_POLL_DUAL (NFCSIM_POLL_INITIATOR | NFCSIM_POLL_TARGET)
34
35#define RX_DEFAULT_DELAY 5
36
37struct nfcsim {
38 struct nfc_dev *nfc_dev;
39
40 struct mutex lock;
41
42 struct delayed_work recv_work;
43
44 struct sk_buff *clone_skb;
45
46 struct delayed_work poll_work;
47 u8 polling_mode;
48 u8 curr_polling_mode;
49
50 u8 shutting_down;
51
52 u8 up;
53
54 u8 initiator;
55
56 u32 rx_delay;
57
58 data_exchange_cb_t cb;
59 void *cb_context;
60
61 struct nfcsim *peer_dev;
62};
63
64static struct nfcsim *dev0;
65static struct nfcsim *dev1;
66
67static struct workqueue_struct *wq;
68
69static void nfcsim_cleanup_dev(struct nfcsim *dev, u8 shutdown)
70{
71 DEV_DBG(dev, "shutdown=%d\n", shutdown);
72
73 mutex_lock(&dev->lock);
74
75 dev->polling_mode = NFCSIM_POLL_NONE;
76 dev->shutting_down = shutdown;
77 dev->cb = NULL;
78 dev_kfree_skb(dev->clone_skb);
79 dev->clone_skb = NULL;
80
81 mutex_unlock(&dev->lock);
82
83 cancel_delayed_work_sync(&dev->poll_work);
84 cancel_delayed_work_sync(&dev->recv_work);
85}
86
87static int nfcsim_target_found(struct nfcsim *dev)
88{
89 struct nfc_target nfc_tgt;
90
91 DEV_DBG(dev, "\n");
92
93 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
94
95 nfc_tgt.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
96 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
97
98 return 0;
99}
100
101static int nfcsim_dev_up(struct nfc_dev *nfc_dev)
102{
103 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
104
105 DEV_DBG(dev, "\n");
106
107 mutex_lock(&dev->lock);
108
109 dev->up = 1;
110
111 mutex_unlock(&dev->lock);
112
113 return 0;
114}
115
116static int nfcsim_dev_down(struct nfc_dev *nfc_dev)
117{
118 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
119
120 DEV_DBG(dev, "\n");
121
122 mutex_lock(&dev->lock);
123
124 dev->up = 0;
125
126 mutex_unlock(&dev->lock);
127
128 return 0;
129}
130
131static int nfcsim_dep_link_up(struct nfc_dev *nfc_dev,
132 struct nfc_target *target,
133 u8 comm_mode, u8 *gb, size_t gb_len)
134{
135 int rc;
136 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
137 struct nfcsim *peer = dev->peer_dev;
138 u8 *remote_gb;
139 size_t remote_gb_len;
140
141 DEV_DBG(dev, "target_idx: %d, comm_mode: %d\n", target->idx, comm_mode);
142
143 mutex_lock(&peer->lock);
144
145 nfc_tm_activated(peer->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
146 NFC_COMM_ACTIVE, gb, gb_len);
147
148 remote_gb = nfc_get_local_general_bytes(peer->nfc_dev, &remote_gb_len);
149 if (!remote_gb) {
150 DEV_ERR(peer, "Can't get remote general bytes\n");
151
152 mutex_unlock(&peer->lock);
153 return -EINVAL;
154 }
155
156 mutex_unlock(&peer->lock);
157
158 mutex_lock(&dev->lock);
159
160 rc = nfc_set_remote_general_bytes(nfc_dev, remote_gb, remote_gb_len);
161 if (rc) {
162 DEV_ERR(dev, "Can't set remote general bytes\n");
163 mutex_unlock(&dev->lock);
164 return rc;
165 }
166
167 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_ACTIVE,
168 NFC_RF_INITIATOR);
169
170 mutex_unlock(&dev->lock);
171
172 return rc;
173}
174
175static int nfcsim_dep_link_down(struct nfc_dev *nfc_dev)
176{
177 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
178
179 DEV_DBG(dev, "\n");
180
181 nfcsim_cleanup_dev(dev, 0);
182
183 return 0;
184}
185
186static int nfcsim_start_poll(struct nfc_dev *nfc_dev,
187 u32 im_protocols, u32 tm_protocols)
188{
189 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
190 int rc;
191
192 mutex_lock(&dev->lock);
193
194 if (dev->polling_mode != NFCSIM_POLL_NONE) {
195 DEV_ERR(dev, "Already in polling mode\n");
196 rc = -EBUSY;
197 goto exit;
198 }
199
200 if (im_protocols & NFC_PROTO_NFC_DEP_MASK)
201 dev->polling_mode |= NFCSIM_POLL_INITIATOR;
202
203 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK)
204 dev->polling_mode |= NFCSIM_POLL_TARGET;
205
206 if (dev->polling_mode == NFCSIM_POLL_NONE) {
207 DEV_ERR(dev, "Unsupported polling mode\n");
208 rc = -EINVAL;
209 goto exit;
210 }
211
212 dev->initiator = 0;
213 dev->curr_polling_mode = NFCSIM_POLL_NONE;
214
215 queue_delayed_work(wq, &dev->poll_work, 0);
216
217 DEV_DBG(dev, "Start polling: im: 0x%X, tm: 0x%X\n", im_protocols,
218 tm_protocols);
219
220 rc = 0;
221exit:
222 mutex_unlock(&dev->lock);
223
224 return rc;
225}
226
227static void nfcsim_stop_poll(struct nfc_dev *nfc_dev)
228{
229 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
230
231 DEV_DBG(dev, "Stop poll\n");
232
233 mutex_lock(&dev->lock);
234
235 dev->polling_mode = NFCSIM_POLL_NONE;
236
237 mutex_unlock(&dev->lock);
238
239 cancel_delayed_work_sync(&dev->poll_work);
240}
241
242static int nfcsim_activate_target(struct nfc_dev *nfc_dev,
243 struct nfc_target *target, u32 protocol)
244{
245 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
246
247 DEV_DBG(dev, "\n");
248
249 return -ENOTSUPP;
250}
251
252static void nfcsim_deactivate_target(struct nfc_dev *nfc_dev,
253 struct nfc_target *target, u8 mode)
254{
255 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
256
257 DEV_DBG(dev, "\n");
258}
259
260static void nfcsim_wq_recv(struct work_struct *work)
261{
262 struct nfcsim *dev = container_of(work, struct nfcsim,
263 recv_work.work);
264
265 mutex_lock(&dev->lock);
266
267 if (dev->shutting_down || !dev->up || !dev->clone_skb) {
268 dev_kfree_skb(dev->clone_skb);
269 goto exit;
270 }
271
272 if (dev->initiator) {
273 if (!dev->cb) {
274 DEV_ERR(dev, "Null recv callback\n");
275 dev_kfree_skb(dev->clone_skb);
276 goto exit;
277 }
278
279 dev->cb(dev->cb_context, dev->clone_skb, 0);
280 dev->cb = NULL;
281 } else {
282 nfc_tm_data_received(dev->nfc_dev, dev->clone_skb);
283 }
284
285exit:
286 dev->clone_skb = NULL;
287
288 mutex_unlock(&dev->lock);
289}
290
291static int nfcsim_tx(struct nfc_dev *nfc_dev, struct nfc_target *target,
292 struct sk_buff *skb, data_exchange_cb_t cb,
293 void *cb_context)
294{
295 struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
296 struct nfcsim *peer = dev->peer_dev;
297 int err;
298
299 mutex_lock(&dev->lock);
300
301 if (dev->shutting_down || !dev->up) {
302 mutex_unlock(&dev->lock);
303 err = -ENODEV;
304 goto exit;
305 }
306
307 dev->cb = cb;
308 dev->cb_context = cb_context;
309
310 mutex_unlock(&dev->lock);
311
312 mutex_lock(&peer->lock);
313
314 peer->clone_skb = skb_clone(skb, GFP_KERNEL);
315
316 if (!peer->clone_skb) {
317 DEV_ERR(dev, "skb_clone failed\n");
318 mutex_unlock(&peer->lock);
319 err = -ENOMEM;
320 goto exit;
321 }
322
323 /* This simulates an arbitrary transmission delay between the 2 devices.
324 * If packet transmission occurs immediately between them, we have a
325 * non-stop flow of several tens of thousands SYMM packets per second
326 * and a burning cpu.
327 */
328 queue_delayed_work(wq, &peer->recv_work,
329 msecs_to_jiffies(dev->rx_delay));
330
331 mutex_unlock(&peer->lock);
332
333 err = 0;
334exit:
335 dev_kfree_skb(skb);
336
337 return err;
338}
339
340static int nfcsim_im_transceive(struct nfc_dev *nfc_dev,
341 struct nfc_target *target, struct sk_buff *skb,
342 data_exchange_cb_t cb, void *cb_context)
343{
344 return nfcsim_tx(nfc_dev, target, skb, cb, cb_context);
345}
346
347static int nfcsim_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
348{
349 return nfcsim_tx(nfc_dev, NULL, skb, NULL, NULL);
350}
351
352static struct nfc_ops nfcsim_nfc_ops = {
353 .dev_up = nfcsim_dev_up,
354 .dev_down = nfcsim_dev_down,
355 .dep_link_up = nfcsim_dep_link_up,
356 .dep_link_down = nfcsim_dep_link_down,
357 .start_poll = nfcsim_start_poll,
358 .stop_poll = nfcsim_stop_poll,
359 .activate_target = nfcsim_activate_target,
360 .deactivate_target = nfcsim_deactivate_target,
361 .im_transceive = nfcsim_im_transceive,
362 .tm_send = nfcsim_tm_send,
363};
364
365static void nfcsim_set_polling_mode(struct nfcsim *dev)
366{
367 if (dev->polling_mode == NFCSIM_POLL_NONE) {
368 dev->curr_polling_mode = NFCSIM_POLL_NONE;
369 return;
370 }
371
372 if (dev->curr_polling_mode == NFCSIM_POLL_NONE) {
373 if (dev->polling_mode & NFCSIM_POLL_INITIATOR)
374 dev->curr_polling_mode = NFCSIM_POLL_INITIATOR;
375 else
376 dev->curr_polling_mode = NFCSIM_POLL_TARGET;
377
378 return;
379 }
380
381 if (dev->polling_mode == NFCSIM_POLL_DUAL) {
382 if (dev->curr_polling_mode == NFCSIM_POLL_TARGET)
383 dev->curr_polling_mode = NFCSIM_POLL_INITIATOR;
384 else
385 dev->curr_polling_mode = NFCSIM_POLL_TARGET;
386 }
387}
388
389static void nfcsim_wq_poll(struct work_struct *work)
390{
391 struct nfcsim *dev = container_of(work, struct nfcsim, poll_work.work);
392 struct nfcsim *peer = dev->peer_dev;
393
394 /* These work items run on an ordered workqueue and are therefore
395 * serialized. So we can take both mutexes without being dead locked.
396 */
397 mutex_lock(&dev->lock);
398 mutex_lock(&peer->lock);
399
400 nfcsim_set_polling_mode(dev);
401
402 if (dev->curr_polling_mode == NFCSIM_POLL_NONE) {
403 DEV_DBG(dev, "Not polling\n");
404 goto unlock;
405 }
406
407 DEV_DBG(dev, "Polling as %s",
408 dev->curr_polling_mode == NFCSIM_POLL_INITIATOR ?
409 "initiator\n" : "target\n");
410
411 if (dev->curr_polling_mode == NFCSIM_POLL_TARGET)
412 goto sched_work;
413
414 if (peer->curr_polling_mode == NFCSIM_POLL_TARGET) {
415 peer->polling_mode = NFCSIM_POLL_NONE;
416 dev->polling_mode = NFCSIM_POLL_NONE;
417
418 dev->initiator = 1;
419
420 nfcsim_target_found(dev);
421
422 goto unlock;
423 }
424
425sched_work:
426 /* This defines the delay for an initiator to check if the other device
427 * is polling in target mode.
428 * If the device starts in dual mode polling, it switches between
429 * initiator and target at every round.
430 * Because the wq is ordered and only 1 work item is executed at a time,
431 * we'll always have one device polling as initiator and the other as
432 * target at some point, even if both are started in dual mode.
433 */
434 queue_delayed_work(wq, &dev->poll_work, msecs_to_jiffies(200));
435
436unlock:
437 mutex_unlock(&peer->lock);
438 mutex_unlock(&dev->lock);
439}
440
441static struct nfcsim *nfcsim_init_dev(void)
442{
443 struct nfcsim *dev;
444 int rc = -ENOMEM;
445
446 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
447 if (dev == NULL)
448 return ERR_PTR(-ENOMEM);
449
450 mutex_init(&dev->lock);
451
452 INIT_DELAYED_WORK(&dev->recv_work, nfcsim_wq_recv);
453 INIT_DELAYED_WORK(&dev->poll_work, nfcsim_wq_poll);
454
455 dev->nfc_dev = nfc_allocate_device(&nfcsim_nfc_ops,
456 NFC_PROTO_NFC_DEP_MASK,
457 0, 0);
458 if (!dev->nfc_dev)
459 goto error;
460
461 nfc_set_drvdata(dev->nfc_dev, dev);
462
463 rc = nfc_register_device(dev->nfc_dev);
464 if (rc)
465 goto free_nfc_dev;
466
467 dev->rx_delay = RX_DEFAULT_DELAY;
468 return dev;
469
470free_nfc_dev:
471 nfc_free_device(dev->nfc_dev);
472
473error:
474 kfree(dev);
475
476 return ERR_PTR(rc);
477}
478
479static void nfcsim_free_device(struct nfcsim *dev)
480{
481 nfc_unregister_device(dev->nfc_dev);
482
483 nfc_free_device(dev->nfc_dev);
484
485 kfree(dev);
486}
487
488static int __init nfcsim_init(void)
489{
490 int rc;
491
492 /* We need an ordered wq to ensure that poll_work items are executed
493 * one at a time.
494 */
495 wq = alloc_ordered_workqueue("nfcsim", 0);
496 if (!wq) {
497 rc = -ENOMEM;
498 goto exit;
499 }
500
501 dev0 = nfcsim_init_dev();
502 if (IS_ERR(dev0)) {
503 rc = PTR_ERR(dev0);
504 goto exit;
505 }
506
507 dev1 = nfcsim_init_dev();
508 if (IS_ERR(dev1)) {
509 kfree(dev0);
510
511 rc = PTR_ERR(dev1);
512 goto exit;
513 }
514
515 dev0->peer_dev = dev1;
516 dev1->peer_dev = dev0;
517
518 pr_debug("NFCsim " NFCSIM_VERSION " initialized\n");
519
520 rc = 0;
521exit:
522 if (rc)
523 pr_err("Failed to initialize nfcsim driver (%d)\n",
524 rc);
525
526 return rc;
527}
528
529static void __exit nfcsim_exit(void)
530{
531 nfcsim_cleanup_dev(dev0, 1);
532 nfcsim_cleanup_dev(dev1, 1);
533
534 nfcsim_free_device(dev0);
535 nfcsim_free_device(dev1);
536
537 destroy_workqueue(wq);
538}
539
540module_init(nfcsim_init);
541module_exit(nfcsim_exit);
542
543MODULE_DESCRIPTION("NFCSim driver ver " NFCSIM_VERSION);
544MODULE_VERSION(NFCSIM_VERSION);
545MODULE_LICENSE("GPL");
1/*
2 * NFC hardware simulation driver
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
16#include <linux/device.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/ctype.h>
20#include <linux/debugfs.h>
21#include <linux/nfc.h>
22#include <net/nfc/nfc.h>
23#include <net/nfc/digital.h>
24
25#define NFCSIM_ERR(d, fmt, args...) nfc_err(&d->nfc_digital_dev->nfc_dev->dev, \
26 "%s: " fmt, __func__, ## args)
27
28#define NFCSIM_DBG(d, fmt, args...) dev_dbg(&d->nfc_digital_dev->nfc_dev->dev, \
29 "%s: " fmt, __func__, ## args)
30
31#define NFCSIM_VERSION "0.2"
32
33#define NFCSIM_MODE_NONE 0
34#define NFCSIM_MODE_INITIATOR 1
35#define NFCSIM_MODE_TARGET 2
36
37#define NFCSIM_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC | \
38 NFC_DIGITAL_DRV_CAPS_TG_CRC)
39
40struct nfcsim {
41 struct nfc_digital_dev *nfc_digital_dev;
42
43 struct work_struct recv_work;
44 struct delayed_work send_work;
45
46 struct nfcsim_link *link_in;
47 struct nfcsim_link *link_out;
48
49 bool up;
50 u8 mode;
51 u8 rf_tech;
52
53 u16 recv_timeout;
54
55 nfc_digital_cmd_complete_t cb;
56 void *arg;
57
58 u8 dropframe;
59};
60
61struct nfcsim_link {
62 struct mutex lock;
63
64 u8 rf_tech;
65 u8 mode;
66
67 u8 shutdown;
68
69 struct sk_buff *skb;
70 wait_queue_head_t recv_wait;
71 u8 cond;
72};
73
74static struct nfcsim_link *nfcsim_link_new(void)
75{
76 struct nfcsim_link *link;
77
78 link = kzalloc(sizeof(struct nfcsim_link), GFP_KERNEL);
79 if (!link)
80 return NULL;
81
82 mutex_init(&link->lock);
83 init_waitqueue_head(&link->recv_wait);
84
85 return link;
86}
87
88static void nfcsim_link_free(struct nfcsim_link *link)
89{
90 dev_kfree_skb(link->skb);
91 kfree(link);
92}
93
94static void nfcsim_link_recv_wake(struct nfcsim_link *link)
95{
96 link->cond = 1;
97 wake_up_interruptible(&link->recv_wait);
98}
99
100static void nfcsim_link_set_skb(struct nfcsim_link *link, struct sk_buff *skb,
101 u8 rf_tech, u8 mode)
102{
103 mutex_lock(&link->lock);
104
105 dev_kfree_skb(link->skb);
106 link->skb = skb;
107 link->rf_tech = rf_tech;
108 link->mode = mode;
109
110 mutex_unlock(&link->lock);
111}
112
113static void nfcsim_link_recv_cancel(struct nfcsim_link *link)
114{
115 mutex_lock(&link->lock);
116
117 link->mode = NFCSIM_MODE_NONE;
118
119 mutex_unlock(&link->lock);
120
121 nfcsim_link_recv_wake(link);
122}
123
124static void nfcsim_link_shutdown(struct nfcsim_link *link)
125{
126 mutex_lock(&link->lock);
127
128 link->shutdown = 1;
129 link->mode = NFCSIM_MODE_NONE;
130
131 mutex_unlock(&link->lock);
132
133 nfcsim_link_recv_wake(link);
134}
135
136static struct sk_buff *nfcsim_link_recv_skb(struct nfcsim_link *link,
137 int timeout, u8 rf_tech, u8 mode)
138{
139 int rc;
140 struct sk_buff *skb;
141
142 rc = wait_event_interruptible_timeout(link->recv_wait,
143 link->cond,
144 msecs_to_jiffies(timeout));
145
146 mutex_lock(&link->lock);
147
148 skb = link->skb;
149 link->skb = NULL;
150
151 if (!rc) {
152 rc = -ETIMEDOUT;
153 goto done;
154 }
155
156 if (!skb || link->rf_tech != rf_tech || link->mode == mode) {
157 rc = -EINVAL;
158 goto done;
159 }
160
161 if (link->shutdown) {
162 rc = -ENODEV;
163 goto done;
164 }
165
166done:
167 mutex_unlock(&link->lock);
168
169 if (rc < 0) {
170 dev_kfree_skb(skb);
171 skb = ERR_PTR(rc);
172 }
173
174 link->cond = 0;
175
176 return skb;
177}
178
179static void nfcsim_send_wq(struct work_struct *work)
180{
181 struct nfcsim *dev = container_of(work, struct nfcsim, send_work.work);
182
183 /*
184 * To effectively send data, the device just wake up its link_out which
185 * is the link_in of the peer device. The exchanged skb has already been
186 * stored in the dev->link_out through nfcsim_link_set_skb().
187 */
188 nfcsim_link_recv_wake(dev->link_out);
189}
190
191static void nfcsim_recv_wq(struct work_struct *work)
192{
193 struct nfcsim *dev = container_of(work, struct nfcsim, recv_work);
194 struct sk_buff *skb;
195
196 skb = nfcsim_link_recv_skb(dev->link_in, dev->recv_timeout,
197 dev->rf_tech, dev->mode);
198
199 if (!dev->up) {
200 NFCSIM_ERR(dev, "Device is down\n");
201
202 if (!IS_ERR(skb))
203 dev_kfree_skb(skb);
204
205 skb = ERR_PTR(-ENODEV);
206 }
207
208 dev->cb(dev->nfc_digital_dev, dev->arg, skb);
209}
210
211static int nfcsim_send(struct nfc_digital_dev *ddev, struct sk_buff *skb,
212 u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
213{
214 struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
215 u8 delay;
216
217 if (!dev->up) {
218 NFCSIM_ERR(dev, "Device is down\n");
219 return -ENODEV;
220 }
221
222 dev->recv_timeout = timeout;
223 dev->cb = cb;
224 dev->arg = arg;
225
226 schedule_work(&dev->recv_work);
227
228 if (dev->dropframe) {
229 NFCSIM_DBG(dev, "dropping frame (out of %d)\n", dev->dropframe);
230 dev_kfree_skb(skb);
231 dev->dropframe--;
232
233 return 0;
234 }
235
236 if (skb) {
237 nfcsim_link_set_skb(dev->link_out, skb, dev->rf_tech,
238 dev->mode);
239
240 /* Add random delay (between 3 and 10 ms) before sending data */
241 get_random_bytes(&delay, 1);
242 delay = 3 + (delay & 0x07);
243
244 schedule_delayed_work(&dev->send_work, msecs_to_jiffies(delay));
245 }
246
247 return 0;
248}
249
250static void nfcsim_abort_cmd(struct nfc_digital_dev *ddev)
251{
252 struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
253
254 nfcsim_link_recv_cancel(dev->link_in);
255}
256
257static int nfcsim_switch_rf(struct nfc_digital_dev *ddev, bool on)
258{
259 struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
260
261 dev->up = on;
262
263 return 0;
264}
265
266static int nfcsim_in_configure_hw(struct nfc_digital_dev *ddev,
267 int type, int param)
268{
269 struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
270
271 switch (type) {
272 case NFC_DIGITAL_CONFIG_RF_TECH:
273 dev->up = true;
274 dev->mode = NFCSIM_MODE_INITIATOR;
275 dev->rf_tech = param;
276 break;
277
278 case NFC_DIGITAL_CONFIG_FRAMING:
279 break;
280
281 default:
282 NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
283 return -EINVAL;
284 }
285
286 return 0;
287}
288
289static int nfcsim_in_send_cmd(struct nfc_digital_dev *ddev,
290 struct sk_buff *skb, u16 timeout,
291 nfc_digital_cmd_complete_t cb, void *arg)
292{
293 return nfcsim_send(ddev, skb, timeout, cb, arg);
294}
295
296static int nfcsim_tg_configure_hw(struct nfc_digital_dev *ddev,
297 int type, int param)
298{
299 struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
300
301 switch (type) {
302 case NFC_DIGITAL_CONFIG_RF_TECH:
303 dev->up = true;
304 dev->mode = NFCSIM_MODE_TARGET;
305 dev->rf_tech = param;
306 break;
307
308 case NFC_DIGITAL_CONFIG_FRAMING:
309 break;
310
311 default:
312 NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
313 return -EINVAL;
314 }
315
316 return 0;
317}
318
319static int nfcsim_tg_send_cmd(struct nfc_digital_dev *ddev,
320 struct sk_buff *skb, u16 timeout,
321 nfc_digital_cmd_complete_t cb, void *arg)
322{
323 return nfcsim_send(ddev, skb, timeout, cb, arg);
324}
325
326static int nfcsim_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
327 nfc_digital_cmd_complete_t cb, void *arg)
328{
329 return nfcsim_send(ddev, NULL, timeout, cb, arg);
330}
331
332static struct nfc_digital_ops nfcsim_digital_ops = {
333 .in_configure_hw = nfcsim_in_configure_hw,
334 .in_send_cmd = nfcsim_in_send_cmd,
335
336 .tg_listen = nfcsim_tg_listen,
337 .tg_configure_hw = nfcsim_tg_configure_hw,
338 .tg_send_cmd = nfcsim_tg_send_cmd,
339
340 .abort_cmd = nfcsim_abort_cmd,
341 .switch_rf = nfcsim_switch_rf,
342};
343
344static struct dentry *nfcsim_debugfs_root;
345
346static void nfcsim_debugfs_init(void)
347{
348 nfcsim_debugfs_root = debugfs_create_dir("nfcsim", NULL);
349
350 if (!nfcsim_debugfs_root)
351 pr_err("Could not create debugfs entry\n");
352
353}
354
355static void nfcsim_debugfs_remove(void)
356{
357 debugfs_remove_recursive(nfcsim_debugfs_root);
358}
359
360static void nfcsim_debugfs_init_dev(struct nfcsim *dev)
361{
362 struct dentry *dev_dir;
363 char devname[5]; /* nfcX\0 */
364 u32 idx;
365 int n;
366
367 if (!nfcsim_debugfs_root) {
368 NFCSIM_ERR(dev, "nfcsim debugfs not initialized\n");
369 return;
370 }
371
372 idx = dev->nfc_digital_dev->nfc_dev->idx;
373 n = snprintf(devname, sizeof(devname), "nfc%d", idx);
374 if (n >= sizeof(devname)) {
375 NFCSIM_ERR(dev, "Could not compute dev name for dev %d\n", idx);
376 return;
377 }
378
379 dev_dir = debugfs_create_dir(devname, nfcsim_debugfs_root);
380 if (!dev_dir) {
381 NFCSIM_ERR(dev, "Could not create debugfs entries for nfc%d\n",
382 idx);
383 return;
384 }
385
386 debugfs_create_u8("dropframe", 0664, dev_dir, &dev->dropframe);
387}
388
389static struct nfcsim *nfcsim_device_new(struct nfcsim_link *link_in,
390 struct nfcsim_link *link_out)
391{
392 struct nfcsim *dev;
393 int rc;
394
395 dev = kzalloc(sizeof(struct nfcsim), GFP_KERNEL);
396 if (!dev)
397 return ERR_PTR(-ENOMEM);
398
399 INIT_DELAYED_WORK(&dev->send_work, nfcsim_send_wq);
400 INIT_WORK(&dev->recv_work, nfcsim_recv_wq);
401
402 dev->nfc_digital_dev =
403 nfc_digital_allocate_device(&nfcsim_digital_ops,
404 NFC_PROTO_NFC_DEP_MASK,
405 NFCSIM_CAPABILITIES,
406 0, 0);
407 if (!dev->nfc_digital_dev) {
408 kfree(dev);
409 return ERR_PTR(-ENOMEM);
410 }
411
412 nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
413
414 dev->link_in = link_in;
415 dev->link_out = link_out;
416
417 rc = nfc_digital_register_device(dev->nfc_digital_dev);
418 if (rc) {
419 pr_err("Could not register digital device (%d)\n", rc);
420 nfc_digital_free_device(dev->nfc_digital_dev);
421 kfree(dev);
422
423 return ERR_PTR(rc);
424 }
425
426 nfcsim_debugfs_init_dev(dev);
427
428 return dev;
429}
430
431static void nfcsim_device_free(struct nfcsim *dev)
432{
433 nfc_digital_unregister_device(dev->nfc_digital_dev);
434
435 dev->up = false;
436
437 nfcsim_link_shutdown(dev->link_in);
438
439 cancel_delayed_work_sync(&dev->send_work);
440 cancel_work_sync(&dev->recv_work);
441
442 nfc_digital_free_device(dev->nfc_digital_dev);
443
444 kfree(dev);
445}
446
447static struct nfcsim *dev0;
448static struct nfcsim *dev1;
449
450static int __init nfcsim_init(void)
451{
452 struct nfcsim_link *link0, *link1;
453 int rc;
454
455 link0 = nfcsim_link_new();
456 link1 = nfcsim_link_new();
457 if (!link0 || !link1) {
458 rc = -ENOMEM;
459 goto exit_err;
460 }
461
462 nfcsim_debugfs_init();
463
464 dev0 = nfcsim_device_new(link0, link1);
465 if (IS_ERR(dev0)) {
466 rc = PTR_ERR(dev0);
467 goto exit_err;
468 }
469
470 dev1 = nfcsim_device_new(link1, link0);
471 if (IS_ERR(dev1)) {
472 nfcsim_device_free(dev0);
473
474 rc = PTR_ERR(dev1);
475 goto exit_err;
476 }
477
478 pr_info("nfcsim " NFCSIM_VERSION " initialized\n");
479
480 return 0;
481
482exit_err:
483 pr_err("Failed to initialize nfcsim driver (%d)\n", rc);
484
485 nfcsim_link_free(link0);
486 nfcsim_link_free(link1);
487
488 return rc;
489}
490
491static void __exit nfcsim_exit(void)
492{
493 struct nfcsim_link *link0, *link1;
494
495 link0 = dev0->link_in;
496 link1 = dev0->link_out;
497
498 nfcsim_device_free(dev0);
499 nfcsim_device_free(dev1);
500
501 nfcsim_link_free(link0);
502 nfcsim_link_free(link1);
503
504 nfcsim_debugfs_remove();
505}
506
507module_init(nfcsim_init);
508module_exit(nfcsim_exit);
509
510MODULE_DESCRIPTION("NFCSim driver ver " NFCSIM_VERSION);
511MODULE_VERSION(NFCSIM_VERSION);
512MODULE_LICENSE("GPL");