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1/*
2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
3 *
4 * Authors:
5 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
6 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24#include <linux/init.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28
29#include "nfc.h"
30
31#define VERSION "0.1"
32
33int nfc_devlist_generation;
34DEFINE_MUTEX(nfc_devlist_mutex);
35
36int nfc_printk(const char *level, const char *format, ...)
37{
38 struct va_format vaf;
39 va_list args;
40 int r;
41
42 va_start(args, format);
43
44 vaf.fmt = format;
45 vaf.va = &args;
46
47 r = printk("%sNFC: %pV\n", level, &vaf);
48
49 va_end(args);
50
51 return r;
52}
53EXPORT_SYMBOL(nfc_printk);
54
55/**
56 * nfc_start_poll - start polling for nfc targets
57 *
58 * @dev: The nfc device that must start polling
59 * @protocols: bitset of nfc protocols that must be used for polling
60 *
61 * The device remains polling for targets until a target is found or
62 * the nfc_stop_poll function is called.
63 */
64int nfc_start_poll(struct nfc_dev *dev, u32 protocols)
65{
66 int rc;
67
68 nfc_dbg("dev_name=%s protocols=0x%x", dev_name(&dev->dev), protocols);
69
70 if (!protocols)
71 return -EINVAL;
72
73 device_lock(&dev->dev);
74
75 if (!device_is_registered(&dev->dev)) {
76 rc = -ENODEV;
77 goto error;
78 }
79
80 if (dev->polling) {
81 rc = -EBUSY;
82 goto error;
83 }
84
85 rc = dev->ops->start_poll(dev, protocols);
86 if (!rc)
87 dev->polling = true;
88
89error:
90 device_unlock(&dev->dev);
91 return rc;
92}
93
94/**
95 * nfc_stop_poll - stop polling for nfc targets
96 *
97 * @dev: The nfc device that must stop polling
98 */
99int nfc_stop_poll(struct nfc_dev *dev)
100{
101 int rc = 0;
102
103 nfc_dbg("dev_name=%s", dev_name(&dev->dev));
104
105 device_lock(&dev->dev);
106
107 if (!device_is_registered(&dev->dev)) {
108 rc = -ENODEV;
109 goto error;
110 }
111
112 if (!dev->polling) {
113 rc = -EINVAL;
114 goto error;
115 }
116
117 dev->ops->stop_poll(dev);
118 dev->polling = false;
119
120error:
121 device_unlock(&dev->dev);
122 return rc;
123}
124
125/**
126 * nfc_activate_target - prepare the target for data exchange
127 *
128 * @dev: The nfc device that found the target
129 * @target_idx: index of the target that must be activated
130 * @protocol: nfc protocol that will be used for data exchange
131 */
132int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
133{
134 int rc;
135
136 nfc_dbg("dev_name=%s target_idx=%u protocol=%u", dev_name(&dev->dev),
137 target_idx, protocol);
138
139 device_lock(&dev->dev);
140
141 if (!device_is_registered(&dev->dev)) {
142 rc = -ENODEV;
143 goto error;
144 }
145
146 rc = dev->ops->activate_target(dev, target_idx, protocol);
147
148error:
149 device_unlock(&dev->dev);
150 return rc;
151}
152
153/**
154 * nfc_deactivate_target - deactivate a nfc target
155 *
156 * @dev: The nfc device that found the target
157 * @target_idx: index of the target that must be deactivated
158 */
159int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx)
160{
161 int rc = 0;
162
163 nfc_dbg("dev_name=%s target_idx=%u", dev_name(&dev->dev), target_idx);
164
165 device_lock(&dev->dev);
166
167 if (!device_is_registered(&dev->dev)) {
168 rc = -ENODEV;
169 goto error;
170 }
171
172 dev->ops->deactivate_target(dev, target_idx);
173
174error:
175 device_unlock(&dev->dev);
176 return rc;
177}
178
179/**
180 * nfc_data_exchange - transceive data
181 *
182 * @dev: The nfc device that found the target
183 * @target_idx: index of the target
184 * @skb: data to be sent
185 * @cb: callback called when the response is received
186 * @cb_context: parameter for the callback function
187 *
188 * The user must wait for the callback before calling this function again.
189 */
190int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx,
191 struct sk_buff *skb,
192 data_exchange_cb_t cb,
193 void *cb_context)
194{
195 int rc;
196
197 nfc_dbg("dev_name=%s target_idx=%u skb->len=%u", dev_name(&dev->dev),
198 target_idx, skb->len);
199
200 device_lock(&dev->dev);
201
202 if (!device_is_registered(&dev->dev)) {
203 rc = -ENODEV;
204 kfree_skb(skb);
205 goto error;
206 }
207
208 rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context);
209
210error:
211 device_unlock(&dev->dev);
212 return rc;
213}
214
215/**
216 * nfc_alloc_skb - allocate a skb for data exchange responses
217 *
218 * @size: size to allocate
219 * @gfp: gfp flags
220 */
221struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp)
222{
223 struct sk_buff *skb;
224 unsigned int total_size;
225
226 total_size = size + 1;
227 skb = alloc_skb(total_size, gfp);
228
229 if (skb)
230 skb_reserve(skb, 1);
231
232 return skb;
233}
234EXPORT_SYMBOL(nfc_alloc_skb);
235
236/**
237 * nfc_targets_found - inform that targets were found
238 *
239 * @dev: The nfc device that found the targets
240 * @targets: array of nfc targets found
241 * @ntargets: targets array size
242 *
243 * The device driver must call this function when one or many nfc targets
244 * are found. After calling this function, the device driver must stop
245 * polling for targets.
246 */
247int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
248 int n_targets)
249{
250 int i;
251
252 nfc_dbg("dev_name=%s n_targets=%d", dev_name(&dev->dev), n_targets);
253
254 dev->polling = false;
255
256 for (i = 0; i < n_targets; i++)
257 targets[i].idx = dev->target_idx++;
258
259 spin_lock_bh(&dev->targets_lock);
260
261 dev->targets_generation++;
262
263 kfree(dev->targets);
264 dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
265 GFP_ATOMIC);
266
267 if (!dev->targets) {
268 dev->n_targets = 0;
269 spin_unlock_bh(&dev->targets_lock);
270 return -ENOMEM;
271 }
272
273 dev->n_targets = n_targets;
274 spin_unlock_bh(&dev->targets_lock);
275
276 nfc_genl_targets_found(dev);
277
278 return 0;
279}
280EXPORT_SYMBOL(nfc_targets_found);
281
282static void nfc_release(struct device *d)
283{
284 struct nfc_dev *dev = to_nfc_dev(d);
285
286 nfc_dbg("dev_name=%s", dev_name(&dev->dev));
287
288 nfc_genl_data_exit(&dev->genl_data);
289 kfree(dev->targets);
290 kfree(dev);
291}
292
293struct class nfc_class = {
294 .name = "nfc",
295 .dev_release = nfc_release,
296};
297EXPORT_SYMBOL(nfc_class);
298
299static int match_idx(struct device *d, void *data)
300{
301 struct nfc_dev *dev = to_nfc_dev(d);
302 unsigned *idx = data;
303
304 return dev->idx == *idx;
305}
306
307struct nfc_dev *nfc_get_device(unsigned idx)
308{
309 struct device *d;
310
311 d = class_find_device(&nfc_class, NULL, &idx, match_idx);
312 if (!d)
313 return NULL;
314
315 return to_nfc_dev(d);
316}
317
318/**
319 * nfc_allocate_device - allocate a new nfc device
320 *
321 * @ops: device operations
322 * @supported_protocols: NFC protocols supported by the device
323 */
324struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
325 u32 supported_protocols)
326{
327 static atomic_t dev_no = ATOMIC_INIT(0);
328 struct nfc_dev *dev;
329
330 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
331 !ops->deactivate_target || !ops->data_exchange)
332 return NULL;
333
334 if (!supported_protocols)
335 return NULL;
336
337 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
338 if (!dev)
339 return NULL;
340
341 dev->dev.class = &nfc_class;
342 dev->idx = atomic_inc_return(&dev_no) - 1;
343 dev_set_name(&dev->dev, "nfc%d", dev->idx);
344 device_initialize(&dev->dev);
345
346 dev->ops = ops;
347 dev->supported_protocols = supported_protocols;
348
349 spin_lock_init(&dev->targets_lock);
350 nfc_genl_data_init(&dev->genl_data);
351
352 /* first generation must not be 0 */
353 dev->targets_generation = 1;
354
355 return dev;
356}
357EXPORT_SYMBOL(nfc_allocate_device);
358
359/**
360 * nfc_register_device - register a nfc device in the nfc subsystem
361 *
362 * @dev: The nfc device to register
363 */
364int nfc_register_device(struct nfc_dev *dev)
365{
366 int rc;
367
368 nfc_dbg("dev_name=%s", dev_name(&dev->dev));
369
370 mutex_lock(&nfc_devlist_mutex);
371 nfc_devlist_generation++;
372 rc = device_add(&dev->dev);
373 mutex_unlock(&nfc_devlist_mutex);
374
375 if (rc < 0)
376 return rc;
377
378 rc = nfc_genl_device_added(dev);
379 if (rc)
380 nfc_dbg("The userspace won't be notified that the device %s was"
381 " added", dev_name(&dev->dev));
382
383
384 return 0;
385}
386EXPORT_SYMBOL(nfc_register_device);
387
388/**
389 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
390 *
391 * @dev: The nfc device to unregister
392 */
393void nfc_unregister_device(struct nfc_dev *dev)
394{
395 int rc;
396
397 nfc_dbg("dev_name=%s", dev_name(&dev->dev));
398
399 mutex_lock(&nfc_devlist_mutex);
400 nfc_devlist_generation++;
401
402 /* lock to avoid unregistering a device while an operation
403 is in progress */
404 device_lock(&dev->dev);
405 device_del(&dev->dev);
406 device_unlock(&dev->dev);
407
408 mutex_unlock(&nfc_devlist_mutex);
409
410 rc = nfc_genl_device_removed(dev);
411 if (rc)
412 nfc_dbg("The userspace won't be notified that the device %s"
413 " was removed", dev_name(&dev->dev));
414
415}
416EXPORT_SYMBOL(nfc_unregister_device);
417
418static int __init nfc_init(void)
419{
420 int rc;
421
422 nfc_info("NFC Core ver %s", VERSION);
423
424 rc = class_register(&nfc_class);
425 if (rc)
426 return rc;
427
428 rc = nfc_genl_init();
429 if (rc)
430 goto err_genl;
431
432 /* the first generation must not be 0 */
433 nfc_devlist_generation = 1;
434
435 rc = rawsock_init();
436 if (rc)
437 goto err_rawsock;
438
439 rc = af_nfc_init();
440 if (rc)
441 goto err_af_nfc;
442
443 return 0;
444
445err_af_nfc:
446 rawsock_exit();
447err_rawsock:
448 nfc_genl_exit();
449err_genl:
450 class_unregister(&nfc_class);
451 return rc;
452}
453
454static void __exit nfc_exit(void)
455{
456 af_nfc_exit();
457 rawsock_exit();
458 nfc_genl_exit();
459 class_unregister(&nfc_class);
460}
461
462subsys_initcall(nfc_init);
463module_exit(nfc_exit);
464
465MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
466MODULE_DESCRIPTION("NFC Core ver " VERSION);
467MODULE_VERSION(VERSION);
468MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2011 Instituto Nokia de Tecnologia
4 *
5 * Authors:
6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
7 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
11
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/rfkill.h>
17#include <linux/nfc.h>
18
19#include <net/genetlink.h>
20
21#include "nfc.h"
22
23#define VERSION "0.1"
24
25#define NFC_CHECK_PRES_FREQ_MS 2000
26
27int nfc_devlist_generation;
28DEFINE_MUTEX(nfc_devlist_mutex);
29
30/* NFC device ID bitmap */
31static DEFINE_IDA(nfc_index_ida);
32
33int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
34{
35 int rc = 0;
36
37 pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
38
39 device_lock(&dev->dev);
40
41 if (!device_is_registered(&dev->dev)) {
42 rc = -ENODEV;
43 goto error;
44 }
45
46 if (dev->dev_up) {
47 rc = -EBUSY;
48 goto error;
49 }
50
51 if (!dev->ops->fw_download) {
52 rc = -EOPNOTSUPP;
53 goto error;
54 }
55
56 dev->fw_download_in_progress = true;
57 rc = dev->ops->fw_download(dev, firmware_name);
58 if (rc)
59 dev->fw_download_in_progress = false;
60
61error:
62 device_unlock(&dev->dev);
63 return rc;
64}
65
66/**
67 * nfc_fw_download_done - inform that a firmware download was completed
68 *
69 * @dev: The nfc device to which firmware was downloaded
70 * @firmware_name: The firmware filename
71 * @result: The positive value of a standard errno value
72 */
73int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
74 u32 result)
75{
76 dev->fw_download_in_progress = false;
77
78 return nfc_genl_fw_download_done(dev, firmware_name, result);
79}
80EXPORT_SYMBOL(nfc_fw_download_done);
81
82/**
83 * nfc_dev_up - turn on the NFC device
84 *
85 * @dev: The nfc device to be turned on
86 *
87 * The device remains up until the nfc_dev_down function is called.
88 */
89int nfc_dev_up(struct nfc_dev *dev)
90{
91 int rc = 0;
92
93 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
94
95 device_lock(&dev->dev);
96
97 if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
98 rc = -ERFKILL;
99 goto error;
100 }
101
102 if (!device_is_registered(&dev->dev)) {
103 rc = -ENODEV;
104 goto error;
105 }
106
107 if (dev->fw_download_in_progress) {
108 rc = -EBUSY;
109 goto error;
110 }
111
112 if (dev->dev_up) {
113 rc = -EALREADY;
114 goto error;
115 }
116
117 if (dev->ops->dev_up)
118 rc = dev->ops->dev_up(dev);
119
120 if (!rc)
121 dev->dev_up = true;
122
123 /* We have to enable the device before discovering SEs */
124 if (dev->ops->discover_se && dev->ops->discover_se(dev))
125 pr_err("SE discovery failed\n");
126
127error:
128 device_unlock(&dev->dev);
129 return rc;
130}
131
132/**
133 * nfc_dev_down - turn off the NFC device
134 *
135 * @dev: The nfc device to be turned off
136 */
137int nfc_dev_down(struct nfc_dev *dev)
138{
139 int rc = 0;
140
141 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
142
143 device_lock(&dev->dev);
144
145 if (!device_is_registered(&dev->dev)) {
146 rc = -ENODEV;
147 goto error;
148 }
149
150 if (!dev->dev_up) {
151 rc = -EALREADY;
152 goto error;
153 }
154
155 if (dev->polling || dev->active_target) {
156 rc = -EBUSY;
157 goto error;
158 }
159
160 if (dev->ops->dev_down)
161 dev->ops->dev_down(dev);
162
163 dev->dev_up = false;
164
165error:
166 device_unlock(&dev->dev);
167 return rc;
168}
169
170static int nfc_rfkill_set_block(void *data, bool blocked)
171{
172 struct nfc_dev *dev = data;
173
174 pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);
175
176 if (!blocked)
177 return 0;
178
179 nfc_dev_down(dev);
180
181 return 0;
182}
183
184static const struct rfkill_ops nfc_rfkill_ops = {
185 .set_block = nfc_rfkill_set_block,
186};
187
188/**
189 * nfc_start_poll - start polling for nfc targets
190 *
191 * @dev: The nfc device that must start polling
192 * @protocols: bitset of nfc protocols that must be used for polling
193 *
194 * The device remains polling for targets until a target is found or
195 * the nfc_stop_poll function is called.
196 */
197int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
198{
199 int rc;
200
201 pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
202 dev_name(&dev->dev), im_protocols, tm_protocols);
203
204 if (!im_protocols && !tm_protocols)
205 return -EINVAL;
206
207 device_lock(&dev->dev);
208
209 if (!device_is_registered(&dev->dev)) {
210 rc = -ENODEV;
211 goto error;
212 }
213
214 if (!dev->dev_up) {
215 rc = -ENODEV;
216 goto error;
217 }
218
219 if (dev->polling) {
220 rc = -EBUSY;
221 goto error;
222 }
223
224 rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
225 if (!rc) {
226 dev->polling = true;
227 dev->rf_mode = NFC_RF_NONE;
228 }
229
230error:
231 device_unlock(&dev->dev);
232 return rc;
233}
234
235/**
236 * nfc_stop_poll - stop polling for nfc targets
237 *
238 * @dev: The nfc device that must stop polling
239 */
240int nfc_stop_poll(struct nfc_dev *dev)
241{
242 int rc = 0;
243
244 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
245
246 device_lock(&dev->dev);
247
248 if (!device_is_registered(&dev->dev)) {
249 rc = -ENODEV;
250 goto error;
251 }
252
253 if (!dev->polling) {
254 rc = -EINVAL;
255 goto error;
256 }
257
258 dev->ops->stop_poll(dev);
259 dev->polling = false;
260 dev->rf_mode = NFC_RF_NONE;
261
262error:
263 device_unlock(&dev->dev);
264 return rc;
265}
266
267static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
268{
269 int i;
270
271 for (i = 0; i < dev->n_targets; i++) {
272 if (dev->targets[i].idx == target_idx)
273 return &dev->targets[i];
274 }
275
276 return NULL;
277}
278
279int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
280{
281 int rc = 0;
282 u8 *gb;
283 size_t gb_len;
284 struct nfc_target *target;
285
286 pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
287
288 if (!dev->ops->dep_link_up)
289 return -EOPNOTSUPP;
290
291 device_lock(&dev->dev);
292
293 if (!device_is_registered(&dev->dev)) {
294 rc = -ENODEV;
295 goto error;
296 }
297
298 if (dev->dep_link_up == true) {
299 rc = -EALREADY;
300 goto error;
301 }
302
303 gb = nfc_llcp_general_bytes(dev, &gb_len);
304 if (gb_len > NFC_MAX_GT_LEN) {
305 rc = -EINVAL;
306 goto error;
307 }
308
309 target = nfc_find_target(dev, target_index);
310 if (target == NULL) {
311 rc = -ENOTCONN;
312 goto error;
313 }
314
315 rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
316 if (!rc) {
317 dev->active_target = target;
318 dev->rf_mode = NFC_RF_INITIATOR;
319 }
320
321error:
322 device_unlock(&dev->dev);
323 return rc;
324}
325
326int nfc_dep_link_down(struct nfc_dev *dev)
327{
328 int rc = 0;
329
330 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
331
332 if (!dev->ops->dep_link_down)
333 return -EOPNOTSUPP;
334
335 device_lock(&dev->dev);
336
337 if (!device_is_registered(&dev->dev)) {
338 rc = -ENODEV;
339 goto error;
340 }
341
342 if (dev->dep_link_up == false) {
343 rc = -EALREADY;
344 goto error;
345 }
346
347 rc = dev->ops->dep_link_down(dev);
348 if (!rc) {
349 dev->dep_link_up = false;
350 dev->active_target = NULL;
351 dev->rf_mode = NFC_RF_NONE;
352 nfc_llcp_mac_is_down(dev);
353 nfc_genl_dep_link_down_event(dev);
354 }
355
356error:
357 device_unlock(&dev->dev);
358
359 return rc;
360}
361
362int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
363 u8 comm_mode, u8 rf_mode)
364{
365 dev->dep_link_up = true;
366
367 if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
368 struct nfc_target *target;
369
370 target = nfc_find_target(dev, target_idx);
371 if (target == NULL)
372 return -ENOTCONN;
373
374 dev->active_target = target;
375 }
376
377 dev->polling = false;
378 dev->rf_mode = rf_mode;
379
380 nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
381
382 return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
383}
384EXPORT_SYMBOL(nfc_dep_link_is_up);
385
386/**
387 * nfc_activate_target - prepare the target for data exchange
388 *
389 * @dev: The nfc device that found the target
390 * @target_idx: index of the target that must be activated
391 * @protocol: nfc protocol that will be used for data exchange
392 */
393int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
394{
395 int rc;
396 struct nfc_target *target;
397
398 pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
399 dev_name(&dev->dev), target_idx, protocol);
400
401 device_lock(&dev->dev);
402
403 if (!device_is_registered(&dev->dev)) {
404 rc = -ENODEV;
405 goto error;
406 }
407
408 if (dev->active_target) {
409 rc = -EBUSY;
410 goto error;
411 }
412
413 target = nfc_find_target(dev, target_idx);
414 if (target == NULL) {
415 rc = -ENOTCONN;
416 goto error;
417 }
418
419 rc = dev->ops->activate_target(dev, target, protocol);
420 if (!rc) {
421 dev->active_target = target;
422 dev->rf_mode = NFC_RF_INITIATOR;
423
424 if (dev->ops->check_presence && !dev->shutting_down)
425 mod_timer(&dev->check_pres_timer, jiffies +
426 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
427 }
428
429error:
430 device_unlock(&dev->dev);
431 return rc;
432}
433
434/**
435 * nfc_deactivate_target - deactivate a nfc target
436 *
437 * @dev: The nfc device that found the target
438 * @target_idx: index of the target that must be deactivated
439 */
440int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode)
441{
442 int rc = 0;
443
444 pr_debug("dev_name=%s target_idx=%u\n",
445 dev_name(&dev->dev), target_idx);
446
447 device_lock(&dev->dev);
448
449 if (!device_is_registered(&dev->dev)) {
450 rc = -ENODEV;
451 goto error;
452 }
453
454 if (dev->active_target == NULL) {
455 rc = -ENOTCONN;
456 goto error;
457 }
458
459 if (dev->active_target->idx != target_idx) {
460 rc = -ENOTCONN;
461 goto error;
462 }
463
464 if (dev->ops->check_presence)
465 del_timer_sync(&dev->check_pres_timer);
466
467 dev->ops->deactivate_target(dev, dev->active_target, mode);
468 dev->active_target = NULL;
469
470error:
471 device_unlock(&dev->dev);
472 return rc;
473}
474
475/**
476 * nfc_data_exchange - transceive data
477 *
478 * @dev: The nfc device that found the target
479 * @target_idx: index of the target
480 * @skb: data to be sent
481 * @cb: callback called when the response is received
482 * @cb_context: parameter for the callback function
483 *
484 * The user must wait for the callback before calling this function again.
485 */
486int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
487 data_exchange_cb_t cb, void *cb_context)
488{
489 int rc;
490
491 pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
492 dev_name(&dev->dev), target_idx, skb->len);
493
494 device_lock(&dev->dev);
495
496 if (!device_is_registered(&dev->dev)) {
497 rc = -ENODEV;
498 kfree_skb(skb);
499 goto error;
500 }
501
502 if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
503 if (dev->active_target->idx != target_idx) {
504 rc = -EADDRNOTAVAIL;
505 kfree_skb(skb);
506 goto error;
507 }
508
509 if (dev->ops->check_presence)
510 del_timer_sync(&dev->check_pres_timer);
511
512 rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
513 cb_context);
514
515 if (!rc && dev->ops->check_presence && !dev->shutting_down)
516 mod_timer(&dev->check_pres_timer, jiffies +
517 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
518 } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
519 rc = dev->ops->tm_send(dev, skb);
520 } else {
521 rc = -ENOTCONN;
522 kfree_skb(skb);
523 goto error;
524 }
525
526
527error:
528 device_unlock(&dev->dev);
529 return rc;
530}
531
532struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
533{
534 struct nfc_se *se;
535
536 list_for_each_entry(se, &dev->secure_elements, list)
537 if (se->idx == se_idx)
538 return se;
539
540 return NULL;
541}
542EXPORT_SYMBOL(nfc_find_se);
543
544int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
545{
546 struct nfc_se *se;
547 int rc;
548
549 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
550
551 device_lock(&dev->dev);
552
553 if (!device_is_registered(&dev->dev)) {
554 rc = -ENODEV;
555 goto error;
556 }
557
558 if (!dev->dev_up) {
559 rc = -ENODEV;
560 goto error;
561 }
562
563 if (dev->polling) {
564 rc = -EBUSY;
565 goto error;
566 }
567
568 if (!dev->ops->enable_se || !dev->ops->disable_se) {
569 rc = -EOPNOTSUPP;
570 goto error;
571 }
572
573 se = nfc_find_se(dev, se_idx);
574 if (!se) {
575 rc = -EINVAL;
576 goto error;
577 }
578
579 if (se->state == NFC_SE_ENABLED) {
580 rc = -EALREADY;
581 goto error;
582 }
583
584 rc = dev->ops->enable_se(dev, se_idx);
585 if (rc >= 0)
586 se->state = NFC_SE_ENABLED;
587
588error:
589 device_unlock(&dev->dev);
590 return rc;
591}
592
593int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
594{
595 struct nfc_se *se;
596 int rc;
597
598 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
599
600 device_lock(&dev->dev);
601
602 if (!device_is_registered(&dev->dev)) {
603 rc = -ENODEV;
604 goto error;
605 }
606
607 if (!dev->dev_up) {
608 rc = -ENODEV;
609 goto error;
610 }
611
612 if (!dev->ops->enable_se || !dev->ops->disable_se) {
613 rc = -EOPNOTSUPP;
614 goto error;
615 }
616
617 se = nfc_find_se(dev, se_idx);
618 if (!se) {
619 rc = -EINVAL;
620 goto error;
621 }
622
623 if (se->state == NFC_SE_DISABLED) {
624 rc = -EALREADY;
625 goto error;
626 }
627
628 rc = dev->ops->disable_se(dev, se_idx);
629 if (rc >= 0)
630 se->state = NFC_SE_DISABLED;
631
632error:
633 device_unlock(&dev->dev);
634 return rc;
635}
636
637int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
638{
639 pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
640
641 return nfc_llcp_set_remote_gb(dev, gb, gb_len);
642}
643EXPORT_SYMBOL(nfc_set_remote_general_bytes);
644
645u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
646{
647 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
648
649 return nfc_llcp_general_bytes(dev, gb_len);
650}
651EXPORT_SYMBOL(nfc_get_local_general_bytes);
652
653int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
654{
655 /* Only LLCP target mode for now */
656 if (dev->dep_link_up == false) {
657 kfree_skb(skb);
658 return -ENOLINK;
659 }
660
661 return nfc_llcp_data_received(dev, skb);
662}
663EXPORT_SYMBOL(nfc_tm_data_received);
664
665int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
666 u8 *gb, size_t gb_len)
667{
668 int rc;
669
670 device_lock(&dev->dev);
671
672 dev->polling = false;
673
674 if (gb != NULL) {
675 rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
676 if (rc < 0)
677 goto out;
678 }
679
680 dev->rf_mode = NFC_RF_TARGET;
681
682 if (protocol == NFC_PROTO_NFC_DEP_MASK)
683 nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
684
685 rc = nfc_genl_tm_activated(dev, protocol);
686
687out:
688 device_unlock(&dev->dev);
689
690 return rc;
691}
692EXPORT_SYMBOL(nfc_tm_activated);
693
694int nfc_tm_deactivated(struct nfc_dev *dev)
695{
696 dev->dep_link_up = false;
697 dev->rf_mode = NFC_RF_NONE;
698
699 return nfc_genl_tm_deactivated(dev);
700}
701EXPORT_SYMBOL(nfc_tm_deactivated);
702
703/**
704 * nfc_alloc_send_skb - allocate a skb for data exchange responses
705 *
706 * @size: size to allocate
707 * @gfp: gfp flags
708 */
709struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
710 unsigned int flags, unsigned int size,
711 unsigned int *err)
712{
713 struct sk_buff *skb;
714 unsigned int total_size;
715
716 total_size = size +
717 dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
718
719 skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
720 if (skb)
721 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
722
723 return skb;
724}
725
726/**
727 * nfc_alloc_recv_skb - allocate a skb for data exchange responses
728 *
729 * @size: size to allocate
730 * @gfp: gfp flags
731 */
732struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
733{
734 struct sk_buff *skb;
735 unsigned int total_size;
736
737 total_size = size + 1;
738 skb = alloc_skb(total_size, gfp);
739
740 if (skb)
741 skb_reserve(skb, 1);
742
743 return skb;
744}
745EXPORT_SYMBOL(nfc_alloc_recv_skb);
746
747/**
748 * nfc_targets_found - inform that targets were found
749 *
750 * @dev: The nfc device that found the targets
751 * @targets: array of nfc targets found
752 * @ntargets: targets array size
753 *
754 * The device driver must call this function when one or many nfc targets
755 * are found. After calling this function, the device driver must stop
756 * polling for targets.
757 * NOTE: This function can be called with targets=NULL and n_targets=0 to
758 * notify a driver error, meaning that the polling operation cannot complete.
759 * IMPORTANT: this function must not be called from an atomic context.
760 * In addition, it must also not be called from a context that would prevent
761 * the NFC Core to call other nfc ops entry point concurrently.
762 */
763int nfc_targets_found(struct nfc_dev *dev,
764 struct nfc_target *targets, int n_targets)
765{
766 int i;
767
768 pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
769
770 for (i = 0; i < n_targets; i++)
771 targets[i].idx = dev->target_next_idx++;
772
773 device_lock(&dev->dev);
774
775 if (dev->polling == false) {
776 device_unlock(&dev->dev);
777 return 0;
778 }
779
780 dev->polling = false;
781
782 dev->targets_generation++;
783
784 kfree(dev->targets);
785 dev->targets = NULL;
786
787 if (targets) {
788 dev->targets = kmemdup(targets,
789 n_targets * sizeof(struct nfc_target),
790 GFP_ATOMIC);
791
792 if (!dev->targets) {
793 dev->n_targets = 0;
794 device_unlock(&dev->dev);
795 return -ENOMEM;
796 }
797 }
798
799 dev->n_targets = n_targets;
800 device_unlock(&dev->dev);
801
802 nfc_genl_targets_found(dev);
803
804 return 0;
805}
806EXPORT_SYMBOL(nfc_targets_found);
807
808/**
809 * nfc_target_lost - inform that an activated target went out of field
810 *
811 * @dev: The nfc device that had the activated target in field
812 * @target_idx: the nfc index of the target
813 *
814 * The device driver must call this function when the activated target
815 * goes out of the field.
816 * IMPORTANT: this function must not be called from an atomic context.
817 * In addition, it must also not be called from a context that would prevent
818 * the NFC Core to call other nfc ops entry point concurrently.
819 */
820int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
821{
822 struct nfc_target *tg;
823 int i;
824
825 pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
826
827 device_lock(&dev->dev);
828
829 for (i = 0; i < dev->n_targets; i++) {
830 tg = &dev->targets[i];
831 if (tg->idx == target_idx)
832 break;
833 }
834
835 if (i == dev->n_targets) {
836 device_unlock(&dev->dev);
837 return -EINVAL;
838 }
839
840 dev->targets_generation++;
841 dev->n_targets--;
842 dev->active_target = NULL;
843
844 if (dev->n_targets) {
845 memcpy(&dev->targets[i], &dev->targets[i + 1],
846 (dev->n_targets - i) * sizeof(struct nfc_target));
847 } else {
848 kfree(dev->targets);
849 dev->targets = NULL;
850 }
851
852 device_unlock(&dev->dev);
853
854 nfc_genl_target_lost(dev, target_idx);
855
856 return 0;
857}
858EXPORT_SYMBOL(nfc_target_lost);
859
860inline void nfc_driver_failure(struct nfc_dev *dev, int err)
861{
862 nfc_targets_found(dev, NULL, 0);
863}
864EXPORT_SYMBOL(nfc_driver_failure);
865
866int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
867{
868 struct nfc_se *se;
869 int rc;
870
871 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
872
873 se = nfc_find_se(dev, se_idx);
874 if (se)
875 return -EALREADY;
876
877 se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
878 if (!se)
879 return -ENOMEM;
880
881 se->idx = se_idx;
882 se->type = type;
883 se->state = NFC_SE_DISABLED;
884 INIT_LIST_HEAD(&se->list);
885
886 list_add(&se->list, &dev->secure_elements);
887
888 rc = nfc_genl_se_added(dev, se_idx, type);
889 if (rc < 0) {
890 list_del(&se->list);
891 kfree(se);
892
893 return rc;
894 }
895
896 return 0;
897}
898EXPORT_SYMBOL(nfc_add_se);
899
900int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
901{
902 struct nfc_se *se, *n;
903 int rc;
904
905 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
906
907 list_for_each_entry_safe(se, n, &dev->secure_elements, list)
908 if (se->idx == se_idx) {
909 rc = nfc_genl_se_removed(dev, se_idx);
910 if (rc < 0)
911 return rc;
912
913 list_del(&se->list);
914 kfree(se);
915
916 return 0;
917 }
918
919 return -EINVAL;
920}
921EXPORT_SYMBOL(nfc_remove_se);
922
923int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
924 struct nfc_evt_transaction *evt_transaction)
925{
926 int rc;
927
928 pr_debug("transaction: %x\n", se_idx);
929
930 device_lock(&dev->dev);
931
932 if (!evt_transaction) {
933 rc = -EPROTO;
934 goto out;
935 }
936
937 rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
938out:
939 device_unlock(&dev->dev);
940 return rc;
941}
942EXPORT_SYMBOL(nfc_se_transaction);
943
944int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
945{
946 int rc;
947
948 pr_debug("connectivity: %x\n", se_idx);
949
950 device_lock(&dev->dev);
951 rc = nfc_genl_se_connectivity(dev, se_idx);
952 device_unlock(&dev->dev);
953 return rc;
954}
955EXPORT_SYMBOL(nfc_se_connectivity);
956
957static void nfc_release(struct device *d)
958{
959 struct nfc_dev *dev = to_nfc_dev(d);
960 struct nfc_se *se, *n;
961
962 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
963
964 nfc_genl_data_exit(&dev->genl_data);
965 kfree(dev->targets);
966
967 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
968 nfc_genl_se_removed(dev, se->idx);
969 list_del(&se->list);
970 kfree(se);
971 }
972
973 ida_simple_remove(&nfc_index_ida, dev->idx);
974
975 kfree(dev);
976}
977
978static void nfc_check_pres_work(struct work_struct *work)
979{
980 struct nfc_dev *dev = container_of(work, struct nfc_dev,
981 check_pres_work);
982 int rc;
983
984 device_lock(&dev->dev);
985
986 if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
987 rc = dev->ops->check_presence(dev, dev->active_target);
988 if (rc == -EOPNOTSUPP)
989 goto exit;
990 if (rc) {
991 u32 active_target_idx = dev->active_target->idx;
992 device_unlock(&dev->dev);
993 nfc_target_lost(dev, active_target_idx);
994 return;
995 }
996
997 if (!dev->shutting_down)
998 mod_timer(&dev->check_pres_timer, jiffies +
999 msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
1000 }
1001
1002exit:
1003 device_unlock(&dev->dev);
1004}
1005
1006static void nfc_check_pres_timeout(struct timer_list *t)
1007{
1008 struct nfc_dev *dev = from_timer(dev, t, check_pres_timer);
1009
1010 schedule_work(&dev->check_pres_work);
1011}
1012
1013struct class nfc_class = {
1014 .name = "nfc",
1015 .dev_release = nfc_release,
1016};
1017EXPORT_SYMBOL(nfc_class);
1018
1019static int match_idx(struct device *d, const void *data)
1020{
1021 struct nfc_dev *dev = to_nfc_dev(d);
1022 const unsigned int *idx = data;
1023
1024 return dev->idx == *idx;
1025}
1026
1027struct nfc_dev *nfc_get_device(unsigned int idx)
1028{
1029 struct device *d;
1030
1031 d = class_find_device(&nfc_class, NULL, &idx, match_idx);
1032 if (!d)
1033 return NULL;
1034
1035 return to_nfc_dev(d);
1036}
1037
1038/**
1039 * nfc_allocate_device - allocate a new nfc device
1040 *
1041 * @ops: device operations
1042 * @supported_protocols: NFC protocols supported by the device
1043 */
1044struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
1045 u32 supported_protocols,
1046 int tx_headroom, int tx_tailroom)
1047{
1048 struct nfc_dev *dev;
1049 int rc;
1050
1051 if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
1052 !ops->deactivate_target || !ops->im_transceive)
1053 return NULL;
1054
1055 if (!supported_protocols)
1056 return NULL;
1057
1058 dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
1059 if (!dev)
1060 return NULL;
1061
1062 rc = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
1063 if (rc < 0)
1064 goto err_free_dev;
1065 dev->idx = rc;
1066
1067 dev->dev.class = &nfc_class;
1068 dev_set_name(&dev->dev, "nfc%d", dev->idx);
1069 device_initialize(&dev->dev);
1070
1071 dev->ops = ops;
1072 dev->supported_protocols = supported_protocols;
1073 dev->tx_headroom = tx_headroom;
1074 dev->tx_tailroom = tx_tailroom;
1075 INIT_LIST_HEAD(&dev->secure_elements);
1076
1077 nfc_genl_data_init(&dev->genl_data);
1078
1079 dev->rf_mode = NFC_RF_NONE;
1080
1081 /* first generation must not be 0 */
1082 dev->targets_generation = 1;
1083
1084 if (ops->check_presence) {
1085 timer_setup(&dev->check_pres_timer, nfc_check_pres_timeout, 0);
1086 INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
1087 }
1088
1089 return dev;
1090
1091err_free_dev:
1092 kfree(dev);
1093
1094 return NULL;
1095}
1096EXPORT_SYMBOL(nfc_allocate_device);
1097
1098/**
1099 * nfc_register_device - register a nfc device in the nfc subsystem
1100 *
1101 * @dev: The nfc device to register
1102 */
1103int nfc_register_device(struct nfc_dev *dev)
1104{
1105 int rc;
1106
1107 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1108
1109 mutex_lock(&nfc_devlist_mutex);
1110 nfc_devlist_generation++;
1111 rc = device_add(&dev->dev);
1112 mutex_unlock(&nfc_devlist_mutex);
1113
1114 if (rc < 0)
1115 return rc;
1116
1117 rc = nfc_llcp_register_device(dev);
1118 if (rc)
1119 pr_err("Could not register llcp device\n");
1120
1121 rc = nfc_genl_device_added(dev);
1122 if (rc)
1123 pr_debug("The userspace won't be notified that the device %s was added\n",
1124 dev_name(&dev->dev));
1125
1126 dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
1127 RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
1128 if (dev->rfkill) {
1129 if (rfkill_register(dev->rfkill) < 0) {
1130 rfkill_destroy(dev->rfkill);
1131 dev->rfkill = NULL;
1132 }
1133 }
1134
1135 return 0;
1136}
1137EXPORT_SYMBOL(nfc_register_device);
1138
1139/**
1140 * nfc_unregister_device - unregister a nfc device in the nfc subsystem
1141 *
1142 * @dev: The nfc device to unregister
1143 */
1144void nfc_unregister_device(struct nfc_dev *dev)
1145{
1146 int rc;
1147
1148 pr_debug("dev_name=%s\n", dev_name(&dev->dev));
1149
1150 if (dev->rfkill) {
1151 rfkill_unregister(dev->rfkill);
1152 rfkill_destroy(dev->rfkill);
1153 }
1154
1155 if (dev->ops->check_presence) {
1156 device_lock(&dev->dev);
1157 dev->shutting_down = true;
1158 device_unlock(&dev->dev);
1159 del_timer_sync(&dev->check_pres_timer);
1160 cancel_work_sync(&dev->check_pres_work);
1161 }
1162
1163 rc = nfc_genl_device_removed(dev);
1164 if (rc)
1165 pr_debug("The userspace won't be notified that the device %s "
1166 "was removed\n", dev_name(&dev->dev));
1167
1168 nfc_llcp_unregister_device(dev);
1169
1170 mutex_lock(&nfc_devlist_mutex);
1171 nfc_devlist_generation++;
1172 device_del(&dev->dev);
1173 mutex_unlock(&nfc_devlist_mutex);
1174}
1175EXPORT_SYMBOL(nfc_unregister_device);
1176
1177static int __init nfc_init(void)
1178{
1179 int rc;
1180
1181 pr_info("NFC Core ver %s\n", VERSION);
1182
1183 rc = class_register(&nfc_class);
1184 if (rc)
1185 return rc;
1186
1187 rc = nfc_genl_init();
1188 if (rc)
1189 goto err_genl;
1190
1191 /* the first generation must not be 0 */
1192 nfc_devlist_generation = 1;
1193
1194 rc = rawsock_init();
1195 if (rc)
1196 goto err_rawsock;
1197
1198 rc = nfc_llcp_init();
1199 if (rc)
1200 goto err_llcp_sock;
1201
1202 rc = af_nfc_init();
1203 if (rc)
1204 goto err_af_nfc;
1205
1206 return 0;
1207
1208err_af_nfc:
1209 nfc_llcp_exit();
1210err_llcp_sock:
1211 rawsock_exit();
1212err_rawsock:
1213 nfc_genl_exit();
1214err_genl:
1215 class_unregister(&nfc_class);
1216 return rc;
1217}
1218
1219static void __exit nfc_exit(void)
1220{
1221 af_nfc_exit();
1222 nfc_llcp_exit();
1223 rawsock_exit();
1224 nfc_genl_exit();
1225 class_unregister(&nfc_class);
1226}
1227
1228subsys_initcall(nfc_init);
1229module_exit(nfc_exit);
1230
1231MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
1232MODULE_DESCRIPTION("NFC Core ver " VERSION);
1233MODULE_VERSION(VERSION);
1234MODULE_LICENSE("GPL");
1235MODULE_ALIAS_NETPROTO(PF_NFC);
1236MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);