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Linux/net/nfc/nci/core.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  The NFC Controller Interface is the communication protocol between an
  4  *  NFC Controller (NFCC) and a Device Host (DH).
  5  *
  6  *  Copyright (C) 2011 Texas Instruments, Inc.
  7  *  Copyright (C) 2014 Marvell International Ltd.
  8  *
  9  *  Written by Ilan Elias <ilane@ti.com>
 10  *
 11  *  Acknowledgements:
 12  *  This file is based on hci_core.c, which was written
 13  *  by Maxim Krasnyansky.
 14  */
 15 
 16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
 17 
 18 #include <linux/module.h>
 19 #include <linux/kernel.h>
 20 #include <linux/types.h>
 21 #include <linux/workqueue.h>
 22 #include <linux/completion.h>
 23 #include <linux/export.h>
 24 #include <linux/sched.h>
 25 #include <linux/bitops.h>
 26 #include <linux/skbuff.h>
 27 
 28 #include "../nfc.h"
 29 #include <net/nfc/nci.h>
 30 #include <net/nfc/nci_core.h>
 31 #include <linux/nfc.h>
 32 
 33 struct core_conn_create_data {
 34         int length;
 35         struct nci_core_conn_create_cmd *cmd;
 36 };
 37 
 38 static void nci_cmd_work(struct work_struct *work);
 39 static void nci_rx_work(struct work_struct *work);
 40 static void nci_tx_work(struct work_struct *work);
 41 
 42 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
 43                                                    int conn_id)
 44 {
 45         struct nci_conn_info *conn_info;
 46 
 47         list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
 48                 if (conn_info->conn_id == conn_id)
 49                         return conn_info;
 50         }
 51 
 52         return NULL;
 53 }
 54 
 55 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
 56                                           struct dest_spec_params *params)
 57 {
 58         struct nci_conn_info *conn_info;
 59 
 60         list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
 61                 if (conn_info->dest_type == dest_type) {
 62                         if (!params)
 63                                 return conn_info->conn_id;
 64 
 65                         if (params->id == conn_info->dest_params->id &&
 66                             params->protocol == conn_info->dest_params->protocol)
 67                                 return conn_info->conn_id;
 68                 }
 69         }
 70 
 71         return -EINVAL;
 72 }
 73 EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
 74 
 75 /* ---- NCI requests ---- */
 76 
 77 void nci_req_complete(struct nci_dev *ndev, int result)
 78 {
 79         if (ndev->req_status == NCI_REQ_PEND) {
 80                 ndev->req_result = result;
 81                 ndev->req_status = NCI_REQ_DONE;
 82                 complete(&ndev->req_completion);
 83         }
 84 }
 85 EXPORT_SYMBOL(nci_req_complete);
 86 
 87 static void nci_req_cancel(struct nci_dev *ndev, int err)
 88 {
 89         if (ndev->req_status == NCI_REQ_PEND) {
 90                 ndev->req_result = err;
 91                 ndev->req_status = NCI_REQ_CANCELED;
 92                 complete(&ndev->req_completion);
 93         }
 94 }
 95 
 96 /* Execute request and wait for completion. */
 97 static int __nci_request(struct nci_dev *ndev,
 98                          void (*req)(struct nci_dev *ndev, unsigned long opt),
 99                          unsigned long opt, __u32 timeout)
100 {
101         int rc = 0;
102         long completion_rc;
103 
104         ndev->req_status = NCI_REQ_PEND;
105 
106         reinit_completion(&ndev->req_completion);
107         req(ndev, opt);
108         completion_rc =
109                 wait_for_completion_interruptible_timeout(&ndev->req_completion,
110                                                           timeout);
111 
112         pr_debug("wait_for_completion return %ld\n", completion_rc);
113 
114         if (completion_rc > 0) {
115                 switch (ndev->req_status) {
116                 case NCI_REQ_DONE:
117                         rc = nci_to_errno(ndev->req_result);
118                         break;
119 
120                 case NCI_REQ_CANCELED:
121                         rc = -ndev->req_result;
122                         break;
123 
124                 default:
125                         rc = -ETIMEDOUT;
126                         break;
127                 }
128         } else {
129                 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
130                        completion_rc);
131 
132                 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
133         }
134 
135         ndev->req_status = ndev->req_result = 0;
136 
137         return rc;
138 }
139 
140 inline int nci_request(struct nci_dev *ndev,
141                        void (*req)(struct nci_dev *ndev,
142                                    unsigned long opt),
143                        unsigned long opt, __u32 timeout)
144 {
145         int rc;
146 
147         if (!test_bit(NCI_UP, &ndev->flags))
148                 return -ENETDOWN;
149 
150         /* Serialize all requests */
151         mutex_lock(&ndev->req_lock);
152         rc = __nci_request(ndev, req, opt, timeout);
153         mutex_unlock(&ndev->req_lock);
154 
155         return rc;
156 }
157 
158 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
159 {
160         struct nci_core_reset_cmd cmd;
161 
162         cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
163         nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
164 }
165 
166 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
167 {
168         nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
169 }
170 
171 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
172 {
173         struct nci_rf_disc_map_cmd cmd;
174         struct disc_map_config *cfg = cmd.mapping_configs;
175         __u8 *num = &cmd.num_mapping_configs;
176         int i;
177 
178         /* set rf mapping configurations */
179         *num = 0;
180 
181         /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
182         for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
183                 if (ndev->supported_rf_interfaces[i] ==
184                     NCI_RF_INTERFACE_ISO_DEP) {
185                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
186                         cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
187                                 NCI_DISC_MAP_MODE_LISTEN;
188                         cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
189                         (*num)++;
190                 } else if (ndev->supported_rf_interfaces[i] ==
191                            NCI_RF_INTERFACE_NFC_DEP) {
192                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
193                         cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
194                                 NCI_DISC_MAP_MODE_LISTEN;
195                         cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
196                         (*num)++;
197                 }
198 
199                 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
200                         break;
201         }
202 
203         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
204                      (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
205 }
206 
207 struct nci_set_config_param {
208         __u8    id;
209         size_t  len;
210         __u8    *val;
211 };
212 
213 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
214 {
215         struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
216         struct nci_core_set_config_cmd cmd;
217 
218         BUG_ON(param->len > NCI_MAX_PARAM_LEN);
219 
220         cmd.num_params = 1;
221         cmd.param.id = param->id;
222         cmd.param.len = param->len;
223         memcpy(cmd.param.val, param->val, param->len);
224 
225         nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
226 }
227 
228 struct nci_rf_discover_param {
229         __u32   im_protocols;
230         __u32   tm_protocols;
231 };
232 
233 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
234 {
235         struct nci_rf_discover_param *param =
236                 (struct nci_rf_discover_param *)opt;
237         struct nci_rf_disc_cmd cmd;
238 
239         cmd.num_disc_configs = 0;
240 
241         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
242             (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
243              param->im_protocols & NFC_PROTO_MIFARE_MASK ||
244              param->im_protocols & NFC_PROTO_ISO14443_MASK ||
245              param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
246                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
247                         NCI_NFC_A_PASSIVE_POLL_MODE;
248                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
249                 cmd.num_disc_configs++;
250         }
251 
252         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
253             (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
254                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
255                         NCI_NFC_B_PASSIVE_POLL_MODE;
256                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
257                 cmd.num_disc_configs++;
258         }
259 
260         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
261             (param->im_protocols & NFC_PROTO_FELICA_MASK ||
262              param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
263                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
264                         NCI_NFC_F_PASSIVE_POLL_MODE;
265                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
266                 cmd.num_disc_configs++;
267         }
268 
269         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
270             (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
271                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
272                         NCI_NFC_V_PASSIVE_POLL_MODE;
273                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
274                 cmd.num_disc_configs++;
275         }
276 
277         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
278             (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
279                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
280                         NCI_NFC_A_PASSIVE_LISTEN_MODE;
281                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
282                 cmd.num_disc_configs++;
283                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
284                         NCI_NFC_F_PASSIVE_LISTEN_MODE;
285                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
286                 cmd.num_disc_configs++;
287         }
288 
289         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
290                      (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
291                      &cmd);
292 }
293 
294 struct nci_rf_discover_select_param {
295         __u8    rf_discovery_id;
296         __u8    rf_protocol;
297 };
298 
299 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
300 {
301         struct nci_rf_discover_select_param *param =
302                 (struct nci_rf_discover_select_param *)opt;
303         struct nci_rf_discover_select_cmd cmd;
304 
305         cmd.rf_discovery_id = param->rf_discovery_id;
306         cmd.rf_protocol = param->rf_protocol;
307 
308         switch (cmd.rf_protocol) {
309         case NCI_RF_PROTOCOL_ISO_DEP:
310                 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
311                 break;
312 
313         case NCI_RF_PROTOCOL_NFC_DEP:
314                 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
315                 break;
316 
317         default:
318                 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
319                 break;
320         }
321 
322         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
323                      sizeof(struct nci_rf_discover_select_cmd), &cmd);
324 }
325 
326 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
327 {
328         struct nci_rf_deactivate_cmd cmd;
329 
330         cmd.type = opt;
331 
332         nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
333                      sizeof(struct nci_rf_deactivate_cmd), &cmd);
334 }
335 
336 struct nci_cmd_param {
337         __u16 opcode;
338         size_t len;
339         __u8 *payload;
340 };
341 
342 static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
343 {
344         struct nci_cmd_param *param =
345                 (struct nci_cmd_param *)opt;
346 
347         nci_send_cmd(ndev, param->opcode, param->len, param->payload);
348 }
349 
350 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
351 {
352         struct nci_cmd_param param;
353 
354         param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
355         param.len = len;
356         param.payload = payload;
357 
358         return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
359                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
360 }
361 EXPORT_SYMBOL(nci_prop_cmd);
362 
363 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload)
364 {
365         struct nci_cmd_param param;
366 
367         param.opcode = opcode;
368         param.len = len;
369         param.payload = payload;
370 
371         return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
372                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
373 }
374 EXPORT_SYMBOL(nci_core_cmd);
375 
376 int nci_core_reset(struct nci_dev *ndev)
377 {
378         return __nci_request(ndev, nci_reset_req, 0,
379                              msecs_to_jiffies(NCI_RESET_TIMEOUT));
380 }
381 EXPORT_SYMBOL(nci_core_reset);
382 
383 int nci_core_init(struct nci_dev *ndev)
384 {
385         return __nci_request(ndev, nci_init_req, 0,
386                              msecs_to_jiffies(NCI_INIT_TIMEOUT));
387 }
388 EXPORT_SYMBOL(nci_core_init);
389 
390 struct nci_loopback_data {
391         u8 conn_id;
392         struct sk_buff *data;
393 };
394 
395 static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
396 {
397         struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
398 
399         nci_send_data(ndev, data->conn_id, data->data);
400 }
401 
402 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
403 {
404         struct nci_dev *ndev = (struct nci_dev *)context;
405         struct nci_conn_info    *conn_info;
406 
407         conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
408         if (!conn_info) {
409                 nci_req_complete(ndev, NCI_STATUS_REJECTED);
410                 return;
411         }
412 
413         conn_info->rx_skb = skb;
414 
415         nci_req_complete(ndev, NCI_STATUS_OK);
416 }
417 
418 int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
419                       struct sk_buff **resp)
420 {
421         int r;
422         struct nci_loopback_data loopback_data;
423         struct nci_conn_info *conn_info;
424         struct sk_buff *skb;
425         int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
426                                         NCI_DESTINATION_NFCC_LOOPBACK, NULL);
427 
428         if (conn_id < 0) {
429                 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
430                                          0, 0, NULL);
431                 if (r != NCI_STATUS_OK)
432                         return r;
433 
434                 conn_id = nci_get_conn_info_by_dest_type_params(ndev,
435                                         NCI_DESTINATION_NFCC_LOOPBACK,
436                                         NULL);
437         }
438 
439         conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
440         if (!conn_info)
441                 return -EPROTO;
442 
443         /* store cb and context to be used on receiving data */
444         conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
445         conn_info->data_exchange_cb_context = ndev;
446 
447         skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
448         if (!skb)
449                 return -ENOMEM;
450 
451         skb_reserve(skb, NCI_DATA_HDR_SIZE);
452         skb_put_data(skb, data, data_len);
453 
454         loopback_data.conn_id = conn_id;
455         loopback_data.data = skb;
456 
457         ndev->cur_conn_id = conn_id;
458         r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data,
459                         msecs_to_jiffies(NCI_DATA_TIMEOUT));
460         if (r == NCI_STATUS_OK && resp)
461                 *resp = conn_info->rx_skb;
462 
463         return r;
464 }
465 EXPORT_SYMBOL(nci_nfcc_loopback);
466 
467 static int nci_open_device(struct nci_dev *ndev)
468 {
469         int rc = 0;
470 
471         mutex_lock(&ndev->req_lock);
472 
473         if (test_bit(NCI_UP, &ndev->flags)) {
474                 rc = -EALREADY;
475                 goto done;
476         }
477 
478         if (ndev->ops->open(ndev)) {
479                 rc = -EIO;
480                 goto done;
481         }
482 
483         atomic_set(&ndev->cmd_cnt, 1);
484 
485         set_bit(NCI_INIT, &ndev->flags);
486 
487         if (ndev->ops->init)
488                 rc = ndev->ops->init(ndev);
489 
490         if (!rc) {
491                 rc = __nci_request(ndev, nci_reset_req, 0,
492                                    msecs_to_jiffies(NCI_RESET_TIMEOUT));
493         }
494 
495         if (!rc && ndev->ops->setup) {
496                 rc = ndev->ops->setup(ndev);
497         }
498 
499         if (!rc) {
500                 rc = __nci_request(ndev, nci_init_req, 0,
501                                    msecs_to_jiffies(NCI_INIT_TIMEOUT));
502         }
503 
504         if (!rc && ndev->ops->post_setup)
505                 rc = ndev->ops->post_setup(ndev);
506 
507         if (!rc) {
508                 rc = __nci_request(ndev, nci_init_complete_req, 0,
509                                    msecs_to_jiffies(NCI_INIT_TIMEOUT));
510         }
511 
512         clear_bit(NCI_INIT, &ndev->flags);
513 
514         if (!rc) {
515                 set_bit(NCI_UP, &ndev->flags);
516                 nci_clear_target_list(ndev);
517                 atomic_set(&ndev->state, NCI_IDLE);
518         } else {
519                 /* Init failed, cleanup */
520                 skb_queue_purge(&ndev->cmd_q);
521                 skb_queue_purge(&ndev->rx_q);
522                 skb_queue_purge(&ndev->tx_q);
523 
524                 ndev->ops->close(ndev);
525                 ndev->flags = 0;
526         }
527 
528 done:
529         mutex_unlock(&ndev->req_lock);
530         return rc;
531 }
532 
533 static int nci_close_device(struct nci_dev *ndev)
534 {
535         nci_req_cancel(ndev, ENODEV);
536         mutex_lock(&ndev->req_lock);
537 
538         if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
539                 del_timer_sync(&ndev->cmd_timer);
540                 del_timer_sync(&ndev->data_timer);
541                 mutex_unlock(&ndev->req_lock);
542                 return 0;
543         }
544 
545         /* Drop RX and TX queues */
546         skb_queue_purge(&ndev->rx_q);
547         skb_queue_purge(&ndev->tx_q);
548 
549         /* Flush RX and TX wq */
550         flush_workqueue(ndev->rx_wq);
551         flush_workqueue(ndev->tx_wq);
552 
553         /* Reset device */
554         skb_queue_purge(&ndev->cmd_q);
555         atomic_set(&ndev->cmd_cnt, 1);
556 
557         set_bit(NCI_INIT, &ndev->flags);
558         __nci_request(ndev, nci_reset_req, 0,
559                       msecs_to_jiffies(NCI_RESET_TIMEOUT));
560 
561         /* After this point our queues are empty
562          * and no works are scheduled.
563          */
564         ndev->ops->close(ndev);
565 
566         clear_bit(NCI_INIT, &ndev->flags);
567 
568         del_timer_sync(&ndev->cmd_timer);
569 
570         /* Flush cmd wq */
571         flush_workqueue(ndev->cmd_wq);
572 
573         /* Clear flags */
574         ndev->flags = 0;
575 
576         mutex_unlock(&ndev->req_lock);
577 
578         return 0;
579 }
580 
581 /* NCI command timer function */
582 static void nci_cmd_timer(struct timer_list *t)
583 {
584         struct nci_dev *ndev = from_timer(ndev, t, cmd_timer);
585 
586         atomic_set(&ndev->cmd_cnt, 1);
587         queue_work(ndev->cmd_wq, &ndev->cmd_work);
588 }
589 
590 /* NCI data exchange timer function */
591 static void nci_data_timer(struct timer_list *t)
592 {
593         struct nci_dev *ndev = from_timer(ndev, t, data_timer);
594 
595         set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
596         queue_work(ndev->rx_wq, &ndev->rx_work);
597 }
598 
599 static int nci_dev_up(struct nfc_dev *nfc_dev)
600 {
601         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
602 
603         return nci_open_device(ndev);
604 }
605 
606 static int nci_dev_down(struct nfc_dev *nfc_dev)
607 {
608         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
609 
610         return nci_close_device(ndev);
611 }
612 
613 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
614 {
615         struct nci_set_config_param param;
616 
617         if (!val || !len)
618                 return 0;
619 
620         param.id = id;
621         param.len = len;
622         param.val = val;
623 
624         return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
625                              msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
626 }
627 EXPORT_SYMBOL(nci_set_config);
628 
629 static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
630 {
631         struct nci_nfcee_discover_cmd cmd;
632         __u8 action = opt;
633 
634         cmd.discovery_action = action;
635 
636         nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
637 }
638 
639 int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
640 {
641         return __nci_request(ndev, nci_nfcee_discover_req, action,
642                                 msecs_to_jiffies(NCI_CMD_TIMEOUT));
643 }
644 EXPORT_SYMBOL(nci_nfcee_discover);
645 
646 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
647 {
648         struct nci_nfcee_mode_set_cmd *cmd =
649                                         (struct nci_nfcee_mode_set_cmd *)opt;
650 
651         nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
652                      sizeof(struct nci_nfcee_mode_set_cmd), cmd);
653 }
654 
655 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
656 {
657         struct nci_nfcee_mode_set_cmd cmd;
658 
659         cmd.nfcee_id = nfcee_id;
660         cmd.nfcee_mode = nfcee_mode;
661 
662         return __nci_request(ndev, nci_nfcee_mode_set_req,
663                              (unsigned long)&cmd,
664                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
665 }
666 EXPORT_SYMBOL(nci_nfcee_mode_set);
667 
668 static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
669 {
670         struct core_conn_create_data *data =
671                                         (struct core_conn_create_data *)opt;
672 
673         nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
674 }
675 
676 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
677                          u8 number_destination_params,
678                          size_t params_len,
679                          struct core_conn_create_dest_spec_params *params)
680 {
681         int r;
682         struct nci_core_conn_create_cmd *cmd;
683         struct core_conn_create_data data;
684 
685         data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
686         cmd = kzalloc(data.length, GFP_KERNEL);
687         if (!cmd)
688                 return -ENOMEM;
689 
690         cmd->destination_type = destination_type;
691         cmd->number_destination_params = number_destination_params;
692 
693         data.cmd = cmd;
694 
695         if (params) {
696                 memcpy(cmd->params, params, params_len);
697                 if (params->length > 0)
698                         memcpy(&ndev->cur_params,
699                                &params->value[DEST_SPEC_PARAMS_ID_INDEX],
700                                sizeof(struct dest_spec_params));
701                 else
702                         ndev->cur_params.id = 0;
703         } else {
704                 ndev->cur_params.id = 0;
705         }
706         ndev->cur_dest_type = destination_type;
707 
708         r = __nci_request(ndev, nci_core_conn_create_req, (unsigned long)&data,
709                           msecs_to_jiffies(NCI_CMD_TIMEOUT));
710         kfree(cmd);
711         return r;
712 }
713 EXPORT_SYMBOL(nci_core_conn_create);
714 
715 static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
716 {
717         __u8 conn_id = opt;
718 
719         nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
720 }
721 
722 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
723 {
724         ndev->cur_conn_id = conn_id;
725         return __nci_request(ndev, nci_core_conn_close_req, conn_id,
726                              msecs_to_jiffies(NCI_CMD_TIMEOUT));
727 }
728 EXPORT_SYMBOL(nci_core_conn_close);
729 
730 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
731 {
732         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
733         struct nci_set_config_param param;
734         int rc;
735 
736         param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
737         if ((param.val == NULL) || (param.len == 0))
738                 return 0;
739 
740         if (param.len > NFC_MAX_GT_LEN)
741                 return -EINVAL;
742 
743         param.id = NCI_PN_ATR_REQ_GEN_BYTES;
744 
745         rc = nci_request(ndev, nci_set_config_req, (unsigned long)&param,
746                          msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
747         if (rc)
748                 return rc;
749 
750         param.id = NCI_LN_ATR_RES_GEN_BYTES;
751 
752         return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
753                            msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
754 }
755 
756 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
757 {
758         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
759         int rc;
760         __u8 val;
761 
762         val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
763 
764         rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
765         if (rc)
766                 return rc;
767 
768         val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
769 
770         rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
771         if (rc)
772                 return rc;
773 
774         val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
775 
776         return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
777 }
778 
779 static int nci_start_poll(struct nfc_dev *nfc_dev,
780                           __u32 im_protocols, __u32 tm_protocols)
781 {
782         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
783         struct nci_rf_discover_param param;
784         int rc;
785 
786         if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
787             (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
788                 pr_err("unable to start poll, since poll is already active\n");
789                 return -EBUSY;
790         }
791 
792         if (ndev->target_active_prot) {
793                 pr_err("there is an active target\n");
794                 return -EBUSY;
795         }
796 
797         if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
798             (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
799                 pr_debug("target active or w4 select, implicitly deactivate\n");
800 
801                 rc = nci_request(ndev, nci_rf_deactivate_req,
802                                  NCI_DEACTIVATE_TYPE_IDLE_MODE,
803                                  msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
804                 if (rc)
805                         return -EBUSY;
806         }
807 
808         if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
809                 rc = nci_set_local_general_bytes(nfc_dev);
810                 if (rc) {
811                         pr_err("failed to set local general bytes\n");
812                         return rc;
813                 }
814         }
815 
816         if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
817                 rc = nci_set_listen_parameters(nfc_dev);
818                 if (rc)
819                         pr_err("failed to set listen parameters\n");
820         }
821 
822         param.im_protocols = im_protocols;
823         param.tm_protocols = tm_protocols;
824         rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)&param,
825                          msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
826 
827         if (!rc)
828                 ndev->poll_prots = im_protocols;
829 
830         return rc;
831 }
832 
833 static void nci_stop_poll(struct nfc_dev *nfc_dev)
834 {
835         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
836 
837         if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
838             (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
839                 pr_err("unable to stop poll, since poll is not active\n");
840                 return;
841         }
842 
843         nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE,
844                     msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
845 }
846 
847 static int nci_activate_target(struct nfc_dev *nfc_dev,
848                                struct nfc_target *target, __u32 protocol)
849 {
850         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
851         struct nci_rf_discover_select_param param;
852         struct nfc_target *nci_target = NULL;
853         int i;
854         int rc = 0;
855 
856         pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
857 
858         if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
859             (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
860                 pr_err("there is no available target to activate\n");
861                 return -EINVAL;
862         }
863 
864         if (ndev->target_active_prot) {
865                 pr_err("there is already an active target\n");
866                 return -EBUSY;
867         }
868 
869         for (i = 0; i < ndev->n_targets; i++) {
870                 if (ndev->targets[i].idx == target->idx) {
871                         nci_target = &ndev->targets[i];
872                         break;
873                 }
874         }
875 
876         if (!nci_target) {
877                 pr_err("unable to find the selected target\n");
878                 return -EINVAL;
879         }
880 
881         if (!(nci_target->supported_protocols & (1 << protocol))) {
882                 pr_err("target does not support the requested protocol 0x%x\n",
883                        protocol);
884                 return -EINVAL;
885         }
886 
887         if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
888                 param.rf_discovery_id = nci_target->logical_idx;
889 
890                 if (protocol == NFC_PROTO_JEWEL)
891                         param.rf_protocol = NCI_RF_PROTOCOL_T1T;
892                 else if (protocol == NFC_PROTO_MIFARE)
893                         param.rf_protocol = NCI_RF_PROTOCOL_T2T;
894                 else if (protocol == NFC_PROTO_FELICA)
895                         param.rf_protocol = NCI_RF_PROTOCOL_T3T;
896                 else if (protocol == NFC_PROTO_ISO14443 ||
897                          protocol == NFC_PROTO_ISO14443_B)
898                         param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
899                 else
900                         param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
901 
902                 rc = nci_request(ndev, nci_rf_discover_select_req,
903                                  (unsigned long)&param,
904                                  msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
905         }
906 
907         if (!rc)
908                 ndev->target_active_prot = protocol;
909 
910         return rc;
911 }
912 
913 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
914                                   struct nfc_target *target,
915                                   __u8 mode)
916 {
917         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
918         u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
919 
920         pr_debug("entry\n");
921 
922         if (!ndev->target_active_prot) {
923                 pr_err("unable to deactivate target, no active target\n");
924                 return;
925         }
926 
927         ndev->target_active_prot = 0;
928 
929         switch (mode) {
930         case NFC_TARGET_MODE_SLEEP:
931                 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
932                 break;
933         }
934 
935         if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
936                 nci_request(ndev, nci_rf_deactivate_req, nci_mode,
937                             msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
938         }
939 }
940 
941 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
942                            __u8 comm_mode, __u8 *gb, size_t gb_len)
943 {
944         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
945         int rc;
946 
947         pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
948 
949         rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
950         if (rc)
951                 return rc;
952 
953         rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
954                                           ndev->remote_gb_len);
955         if (!rc)
956                 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
957                                         NFC_RF_INITIATOR);
958 
959         return rc;
960 }
961 
962 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
963 {
964         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
965         int rc;
966 
967         pr_debug("entry\n");
968 
969         if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
970                 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
971         } else {
972                 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
973                     atomic_read(&ndev->state) == NCI_DISCOVERY) {
974                         nci_request(ndev, nci_rf_deactivate_req, 0,
975                                 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
976                 }
977 
978                 rc = nfc_tm_deactivated(nfc_dev);
979                 if (rc)
980                         pr_err("error when signaling tm deactivation\n");
981         }
982 
983         return 0;
984 }
985 
986 
987 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
988                           struct sk_buff *skb,
989                           data_exchange_cb_t cb, void *cb_context)
990 {
991         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
992         int rc;
993         struct nci_conn_info    *conn_info;
994 
995         conn_info = ndev->rf_conn_info;
996         if (!conn_info)
997                 return -EPROTO;
998 
999         pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
1000 
1001         if (!ndev->target_active_prot) {
1002                 pr_err("unable to exchange data, no active target\n");
1003                 return -EINVAL;
1004         }
1005 
1006         if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1007                 return -EBUSY;
1008 
1009         /* store cb and context to be used on receiving data */
1010         conn_info->data_exchange_cb = cb;
1011         conn_info->data_exchange_cb_context = cb_context;
1012 
1013         rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1014         if (rc)
1015                 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
1016 
1017         return rc;
1018 }
1019 
1020 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
1021 {
1022         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1023         int rc;
1024 
1025         rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1026         if (rc)
1027                 pr_err("unable to send data\n");
1028 
1029         return rc;
1030 }
1031 
1032 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1033 {
1034         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1035 
1036         if (ndev->ops->enable_se)
1037                 return ndev->ops->enable_se(ndev, se_idx);
1038 
1039         return 0;
1040 }
1041 
1042 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1043 {
1044         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1045 
1046         if (ndev->ops->disable_se)
1047                 return ndev->ops->disable_se(ndev, se_idx);
1048 
1049         return 0;
1050 }
1051 
1052 static int nci_discover_se(struct nfc_dev *nfc_dev)
1053 {
1054         int r;
1055         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1056 
1057         if (ndev->ops->discover_se) {
1058                 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
1059                 if (r != NCI_STATUS_OK)
1060                         return -EPROTO;
1061 
1062                 return ndev->ops->discover_se(ndev);
1063         }
1064 
1065         return 0;
1066 }
1067 
1068 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
1069                      u8 *apdu, size_t apdu_length,
1070                      se_io_cb_t cb, void *cb_context)
1071 {
1072         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1073 
1074         if (ndev->ops->se_io)
1075                 return ndev->ops->se_io(ndev, se_idx, apdu,
1076                                 apdu_length, cb, cb_context);
1077 
1078         return 0;
1079 }
1080 
1081 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
1082 {
1083         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1084 
1085         if (!ndev->ops->fw_download)
1086                 return -ENOTSUPP;
1087 
1088         return ndev->ops->fw_download(ndev, firmware_name);
1089 }
1090 
1091 static struct nfc_ops nci_nfc_ops = {
1092         .dev_up = nci_dev_up,
1093         .dev_down = nci_dev_down,
1094         .start_poll = nci_start_poll,
1095         .stop_poll = nci_stop_poll,
1096         .dep_link_up = nci_dep_link_up,
1097         .dep_link_down = nci_dep_link_down,
1098         .activate_target = nci_activate_target,
1099         .deactivate_target = nci_deactivate_target,
1100         .im_transceive = nci_transceive,
1101         .tm_send = nci_tm_send,
1102         .enable_se = nci_enable_se,
1103         .disable_se = nci_disable_se,
1104         .discover_se = nci_discover_se,
1105         .se_io = nci_se_io,
1106         .fw_download = nci_fw_download,
1107 };
1108 
1109 /* ---- Interface to NCI drivers ---- */
1110 /**
1111  * nci_allocate_device - allocate a new nci device
1112  *
1113  * @ops: device operations
1114  * @supported_protocols: NFC protocols supported by the device
1115  */
1116 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
1117                                     __u32 supported_protocols,
1118                                     int tx_headroom, int tx_tailroom)
1119 {
1120         struct nci_dev *ndev;
1121 
1122         pr_debug("supported_protocols 0x%x\n", supported_protocols);
1123 
1124         if (!ops->open || !ops->close || !ops->send)
1125                 return NULL;
1126 
1127         if (!supported_protocols)
1128                 return NULL;
1129 
1130         ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
1131         if (!ndev)
1132                 return NULL;
1133 
1134         ndev->ops = ops;
1135 
1136         if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
1137                 pr_err("Too many proprietary commands: %zd\n",
1138                        ops->n_prop_ops);
1139                 ops->prop_ops = NULL;
1140                 ops->n_prop_ops = 0;
1141         }
1142 
1143         ndev->tx_headroom = tx_headroom;
1144         ndev->tx_tailroom = tx_tailroom;
1145         init_completion(&ndev->req_completion);
1146 
1147         ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
1148                                             supported_protocols,
1149                                             tx_headroom + NCI_DATA_HDR_SIZE,
1150                                             tx_tailroom);
1151         if (!ndev->nfc_dev)
1152                 goto free_nci;
1153 
1154         ndev->hci_dev = nci_hci_allocate(ndev);
1155         if (!ndev->hci_dev)
1156                 goto free_nfc;
1157 
1158         nfc_set_drvdata(ndev->nfc_dev, ndev);
1159 
1160         return ndev;
1161 
1162 free_nfc:
1163         nfc_free_device(ndev->nfc_dev);
1164 free_nci:
1165         kfree(ndev);
1166         return NULL;
1167 }
1168 EXPORT_SYMBOL(nci_allocate_device);
1169 
1170 /**
1171  * nci_free_device - deallocate nci device
1172  *
1173  * @ndev: The nci device to deallocate
1174  */
1175 void nci_free_device(struct nci_dev *ndev)
1176 {
1177         nfc_free_device(ndev->nfc_dev);
1178         kfree(ndev);
1179 }
1180 EXPORT_SYMBOL(nci_free_device);
1181 
1182 /**
1183  * nci_register_device - register a nci device in the nfc subsystem
1184  *
1185  * @dev: The nci device to register
1186  */
1187 int nci_register_device(struct nci_dev *ndev)
1188 {
1189         int rc;
1190         struct device *dev = &ndev->nfc_dev->dev;
1191         char name[32];
1192 
1193         ndev->flags = 0;
1194 
1195         INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1196         snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1197         ndev->cmd_wq = create_singlethread_workqueue(name);
1198         if (!ndev->cmd_wq) {
1199                 rc = -ENOMEM;
1200                 goto exit;
1201         }
1202 
1203         INIT_WORK(&ndev->rx_work, nci_rx_work);
1204         snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1205         ndev->rx_wq = create_singlethread_workqueue(name);
1206         if (!ndev->rx_wq) {
1207                 rc = -ENOMEM;
1208                 goto destroy_cmd_wq_exit;
1209         }
1210 
1211         INIT_WORK(&ndev->tx_work, nci_tx_work);
1212         snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1213         ndev->tx_wq = create_singlethread_workqueue(name);
1214         if (!ndev->tx_wq) {
1215                 rc = -ENOMEM;
1216                 goto destroy_rx_wq_exit;
1217         }
1218 
1219         skb_queue_head_init(&ndev->cmd_q);
1220         skb_queue_head_init(&ndev->rx_q);
1221         skb_queue_head_init(&ndev->tx_q);
1222 
1223         timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0);
1224         timer_setup(&ndev->data_timer, nci_data_timer, 0);
1225 
1226         mutex_init(&ndev->req_lock);
1227         INIT_LIST_HEAD(&ndev->conn_info_list);
1228 
1229         rc = nfc_register_device(ndev->nfc_dev);
1230         if (rc)
1231                 goto destroy_rx_wq_exit;
1232 
1233         goto exit;
1234 
1235 destroy_rx_wq_exit:
1236         destroy_workqueue(ndev->rx_wq);
1237 
1238 destroy_cmd_wq_exit:
1239         destroy_workqueue(ndev->cmd_wq);
1240 
1241 exit:
1242         return rc;
1243 }
1244 EXPORT_SYMBOL(nci_register_device);
1245 
1246 /**
1247  * nci_unregister_device - unregister a nci device in the nfc subsystem
1248  *
1249  * @dev: The nci device to unregister
1250  */
1251 void nci_unregister_device(struct nci_dev *ndev)
1252 {
1253         struct nci_conn_info    *conn_info, *n;
1254 
1255         nci_close_device(ndev);
1256 
1257         destroy_workqueue(ndev->cmd_wq);
1258         destroy_workqueue(ndev->rx_wq);
1259         destroy_workqueue(ndev->tx_wq);
1260 
1261         list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1262                 list_del(&conn_info->list);
1263                 /* conn_info is allocated with devm_kzalloc */
1264         }
1265 
1266         nfc_unregister_device(ndev->nfc_dev);
1267 }
1268 EXPORT_SYMBOL(nci_unregister_device);
1269 
1270 /**
1271  * nci_recv_frame - receive frame from NCI drivers
1272  *
1273  * @ndev: The nci device
1274  * @skb: The sk_buff to receive
1275  */
1276 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1277 {
1278         pr_debug("len %d\n", skb->len);
1279 
1280         if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1281             !test_bit(NCI_INIT, &ndev->flags))) {
1282                 kfree_skb(skb);
1283                 return -ENXIO;
1284         }
1285 
1286         /* Queue frame for rx worker thread */
1287         skb_queue_tail(&ndev->rx_q, skb);
1288         queue_work(ndev->rx_wq, &ndev->rx_work);
1289 
1290         return 0;
1291 }
1292 EXPORT_SYMBOL(nci_recv_frame);
1293 
1294 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1295 {
1296         pr_debug("len %d\n", skb->len);
1297 
1298         if (!ndev) {
1299                 kfree_skb(skb);
1300                 return -ENODEV;
1301         }
1302 
1303         /* Get rid of skb owner, prior to sending to the driver. */
1304         skb_orphan(skb);
1305 
1306         /* Send copy to sniffer */
1307         nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1308                              RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1309 
1310         return ndev->ops->send(ndev, skb);
1311 }
1312 EXPORT_SYMBOL(nci_send_frame);
1313 
1314 /* Send NCI command */
1315 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
1316 {
1317         struct nci_ctrl_hdr *hdr;
1318         struct sk_buff *skb;
1319 
1320         pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1321 
1322         skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1323         if (!skb) {
1324                 pr_err("no memory for command\n");
1325                 return -ENOMEM;
1326         }
1327 
1328         hdr = skb_put(skb, NCI_CTRL_HDR_SIZE);
1329         hdr->gid = nci_opcode_gid(opcode);
1330         hdr->oid = nci_opcode_oid(opcode);
1331         hdr->plen = plen;
1332 
1333         nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1334         nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1335 
1336         if (plen)
1337                 skb_put_data(skb, payload, plen);
1338 
1339         skb_queue_tail(&ndev->cmd_q, skb);
1340         queue_work(ndev->cmd_wq, &ndev->cmd_work);
1341 
1342         return 0;
1343 }
1344 EXPORT_SYMBOL(nci_send_cmd);
1345 
1346 /* Proprietary commands API */
1347 static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops,
1348                                              size_t n_ops,
1349                                              __u16 opcode)
1350 {
1351         size_t i;
1352         struct nci_driver_ops *op;
1353 
1354         if (!ops || !n_ops)
1355                 return NULL;
1356 
1357         for (i = 0; i < n_ops; i++) {
1358                 op = &ops[i];
1359                 if (op->opcode == opcode)
1360                         return op;
1361         }
1362 
1363         return NULL;
1364 }
1365 
1366 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1367                              struct sk_buff *skb, struct nci_driver_ops *ops,
1368                              size_t n_ops)
1369 {
1370         struct nci_driver_ops *op;
1371 
1372         op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
1373         if (!op || !op->rsp)
1374                 return -ENOTSUPP;
1375 
1376         return op->rsp(ndev, skb);
1377 }
1378 
1379 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1380                              struct sk_buff *skb, struct nci_driver_ops *ops,
1381                              size_t n_ops)
1382 {
1383         struct nci_driver_ops *op;
1384 
1385         op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
1386         if (!op || !op->ntf)
1387                 return -ENOTSUPP;
1388 
1389         return op->ntf(ndev, skb);
1390 }
1391 
1392 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1393                         struct sk_buff *skb)
1394 {
1395         return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1396                                  ndev->ops->n_prop_ops);
1397 }
1398 
1399 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1400                         struct sk_buff *skb)
1401 {
1402         return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1403                                  ndev->ops->n_prop_ops);
1404 }
1405 
1406 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1407                         struct sk_buff *skb)
1408 {
1409         return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
1410                                   ndev->ops->n_core_ops);
1411 }
1412 
1413 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1414                         struct sk_buff *skb)
1415 {
1416         return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
1417                                  ndev->ops->n_core_ops);
1418 }
1419 
1420 /* ---- NCI TX Data worker thread ---- */
1421 
1422 static void nci_tx_work(struct work_struct *work)
1423 {
1424         struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1425         struct nci_conn_info    *conn_info;
1426         struct sk_buff *skb;
1427 
1428         conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1429         if (!conn_info)
1430                 return;
1431 
1432         pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1433 
1434         /* Send queued tx data */
1435         while (atomic_read(&conn_info->credits_cnt)) {
1436                 skb = skb_dequeue(&ndev->tx_q);
1437                 if (!skb)
1438                         return;
1439 
1440                 /* Check if data flow control is used */
1441                 if (atomic_read(&conn_info->credits_cnt) !=
1442                     NCI_DATA_FLOW_CONTROL_NOT_USED)
1443                         atomic_dec(&conn_info->credits_cnt);
1444 
1445                 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1446                          nci_pbf(skb->data),
1447                          nci_conn_id(skb->data),
1448                          nci_plen(skb->data));
1449 
1450                 nci_send_frame(ndev, skb);
1451 
1452                 mod_timer(&ndev->data_timer,
1453                           jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1454         }
1455 }
1456 
1457 /* ----- NCI RX worker thread (data & control) ----- */
1458 
1459 static void nci_rx_work(struct work_struct *work)
1460 {
1461         struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1462         struct sk_buff *skb;
1463 
1464         while ((skb = skb_dequeue(&ndev->rx_q))) {
1465 
1466                 /* Send copy to sniffer */
1467                 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1468                                      RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1469 
1470                 /* Process frame */
1471                 switch (nci_mt(skb->data)) {
1472                 case NCI_MT_RSP_PKT:
1473                         nci_rsp_packet(ndev, skb);
1474                         break;
1475 
1476                 case NCI_MT_NTF_PKT:
1477                         nci_ntf_packet(ndev, skb);
1478                         break;
1479 
1480                 case NCI_MT_DATA_PKT:
1481                         nci_rx_data_packet(ndev, skb);
1482                         break;
1483 
1484                 default:
1485                         pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1486                         kfree_skb(skb);
1487                         break;
1488                 }
1489         }
1490 
1491         /* check if a data exchange timout has occurred */
1492         if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1493                 /* complete the data exchange transaction, if exists */
1494                 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1495                         nci_data_exchange_complete(ndev, NULL,
1496                                                    ndev->cur_conn_id,
1497                                                    -ETIMEDOUT);
1498 
1499                 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1500         }
1501 }
1502 
1503 /* ----- NCI TX CMD worker thread ----- */
1504 
1505 static void nci_cmd_work(struct work_struct *work)
1506 {
1507         struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1508         struct sk_buff *skb;
1509 
1510         pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1511 
1512         /* Send queued command */
1513         if (atomic_read(&ndev->cmd_cnt)) {
1514                 skb = skb_dequeue(&ndev->cmd_q);
1515                 if (!skb)
1516                         return;
1517 
1518                 atomic_dec(&ndev->cmd_cnt);
1519 
1520                 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1521                          nci_pbf(skb->data),
1522                          nci_opcode_gid(nci_opcode(skb->data)),
1523                          nci_opcode_oid(nci_opcode(skb->data)),
1524                          nci_plen(skb->data));
1525 
1526                 nci_send_frame(ndev, skb);
1527 
1528                 mod_timer(&ndev->cmd_timer,
1529                           jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1530         }
1531 }
1532 
1533 MODULE_LICENSE("GPL");
1534 

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