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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (C) 2012  Intel Corporation. All rights reserved.
0004  */
0005 
0006 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
0007 
0008 #include <linux/init.h>
0009 #include <linux/kernel.h>
0010 #include <linux/module.h>
0011 #include <linux/nfc.h>
0012 
0013 #include <net/nfc/nfc.h>
0014 #include <net/nfc/hci.h>
0015 #include <net/nfc/llc.h>
0016 
0017 #include "hci.h"
0018 
0019 /* Largest headroom needed for outgoing HCI commands */
0020 #define HCI_CMDS_HEADROOM 1
0021 
0022 int nfc_hci_result_to_errno(u8 result)
0023 {
0024     switch (result) {
0025     case NFC_HCI_ANY_OK:
0026         return 0;
0027     case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
0028         return -EOPNOTSUPP;
0029     case NFC_HCI_ANY_E_TIMEOUT:
0030         return -ETIME;
0031     default:
0032         return -1;
0033     }
0034 }
0035 EXPORT_SYMBOL(nfc_hci_result_to_errno);
0036 
0037 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
0038 {
0039     int i = 0;
0040 
0041     for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
0042         hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
0043         hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
0044     }
0045     memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
0046 }
0047 EXPORT_SYMBOL(nfc_hci_reset_pipes);
0048 
0049 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
0050 {
0051     int i = 0;
0052 
0053     for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
0054         if (hdev->pipes[i].dest_host != host)
0055             continue;
0056 
0057         hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
0058         hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
0059     }
0060 }
0061 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
0062 
0063 static void nfc_hci_msg_tx_work(struct work_struct *work)
0064 {
0065     struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
0066                         msg_tx_work);
0067     struct hci_msg *msg;
0068     struct sk_buff *skb;
0069     int r = 0;
0070 
0071     mutex_lock(&hdev->msg_tx_mutex);
0072     if (hdev->shutting_down)
0073         goto exit;
0074 
0075     if (hdev->cmd_pending_msg) {
0076         if (timer_pending(&hdev->cmd_timer) == 0) {
0077             if (hdev->cmd_pending_msg->cb)
0078                 hdev->cmd_pending_msg->cb(hdev->
0079                               cmd_pending_msg->
0080                               cb_context,
0081                               NULL,
0082                               -ETIME);
0083             kfree(hdev->cmd_pending_msg);
0084             hdev->cmd_pending_msg = NULL;
0085         } else {
0086             goto exit;
0087         }
0088     }
0089 
0090 next_msg:
0091     if (list_empty(&hdev->msg_tx_queue))
0092         goto exit;
0093 
0094     msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
0095     list_del(&msg->msg_l);
0096 
0097     pr_debug("msg_tx_queue has a cmd to send\n");
0098     while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
0099         r = nfc_llc_xmit_from_hci(hdev->llc, skb);
0100         if (r < 0) {
0101             kfree_skb(skb);
0102             skb_queue_purge(&msg->msg_frags);
0103             if (msg->cb)
0104                 msg->cb(msg->cb_context, NULL, r);
0105             kfree(msg);
0106             break;
0107         }
0108     }
0109 
0110     if (r)
0111         goto next_msg;
0112 
0113     if (msg->wait_response == false) {
0114         kfree(msg);
0115         goto next_msg;
0116     }
0117 
0118     hdev->cmd_pending_msg = msg;
0119     mod_timer(&hdev->cmd_timer, jiffies +
0120           msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
0121 
0122 exit:
0123     mutex_unlock(&hdev->msg_tx_mutex);
0124 }
0125 
0126 static void nfc_hci_msg_rx_work(struct work_struct *work)
0127 {
0128     struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
0129                         msg_rx_work);
0130     struct sk_buff *skb;
0131     const struct hcp_message *message;
0132     u8 pipe;
0133     u8 type;
0134     u8 instruction;
0135 
0136     while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
0137         pipe = skb->data[0];
0138         skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
0139         message = (struct hcp_message *)skb->data;
0140         type = HCP_MSG_GET_TYPE(message->header);
0141         instruction = HCP_MSG_GET_CMD(message->header);
0142         skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
0143 
0144         nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
0145     }
0146 }
0147 
0148 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
0149                      struct sk_buff *skb)
0150 {
0151     del_timer_sync(&hdev->cmd_timer);
0152 
0153     if (hdev->cmd_pending_msg->cb)
0154         hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
0155                       skb, err);
0156     else
0157         kfree_skb(skb);
0158 
0159     kfree(hdev->cmd_pending_msg);
0160     hdev->cmd_pending_msg = NULL;
0161 
0162     schedule_work(&hdev->msg_tx_work);
0163 }
0164 
0165 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
0166                struct sk_buff *skb)
0167 {
0168     mutex_lock(&hdev->msg_tx_mutex);
0169 
0170     if (hdev->cmd_pending_msg == NULL) {
0171         kfree_skb(skb);
0172         goto exit;
0173     }
0174 
0175     __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
0176 
0177 exit:
0178     mutex_unlock(&hdev->msg_tx_mutex);
0179 }
0180 
0181 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
0182               struct sk_buff *skb)
0183 {
0184     u8 status = NFC_HCI_ANY_OK;
0185     const struct hci_create_pipe_resp *create_info;
0186     const struct hci_delete_pipe_noti *delete_info;
0187     const struct hci_all_pipe_cleared_noti *cleared_info;
0188     u8 gate;
0189 
0190     pr_debug("from pipe %x cmd %x\n", pipe, cmd);
0191 
0192     if (pipe >= NFC_HCI_MAX_PIPES) {
0193         status = NFC_HCI_ANY_E_NOK;
0194         goto exit;
0195     }
0196 
0197     gate = hdev->pipes[pipe].gate;
0198 
0199     switch (cmd) {
0200     case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
0201         if (skb->len != 5) {
0202             status = NFC_HCI_ANY_E_NOK;
0203             goto exit;
0204         }
0205         create_info = (struct hci_create_pipe_resp *)skb->data;
0206 
0207         if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
0208             status = NFC_HCI_ANY_E_NOK;
0209             goto exit;
0210         }
0211 
0212         /* Save the new created pipe and bind with local gate,
0213          * the description for skb->data[3] is destination gate id
0214          * but since we received this cmd from host controller, we
0215          * are the destination and it is our local gate
0216          */
0217         hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
0218         hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
0219         hdev->pipes[create_info->pipe].dest_host =
0220                             create_info->src_host;
0221         break;
0222     case NFC_HCI_ANY_OPEN_PIPE:
0223         if (gate == NFC_HCI_INVALID_GATE) {
0224             status = NFC_HCI_ANY_E_NOK;
0225             goto exit;
0226         }
0227         break;
0228     case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
0229         if (skb->len != 1) {
0230             status = NFC_HCI_ANY_E_NOK;
0231             goto exit;
0232         }
0233         delete_info = (struct hci_delete_pipe_noti *)skb->data;
0234 
0235         if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
0236             status = NFC_HCI_ANY_E_NOK;
0237             goto exit;
0238         }
0239 
0240         hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
0241         hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
0242         break;
0243     case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
0244         if (skb->len != 1) {
0245             status = NFC_HCI_ANY_E_NOK;
0246             goto exit;
0247         }
0248         cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
0249 
0250         nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
0251         break;
0252     default:
0253         pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
0254         break;
0255     }
0256 
0257     if (hdev->ops->cmd_received)
0258         hdev->ops->cmd_received(hdev, pipe, cmd, skb);
0259 
0260 exit:
0261     nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
0262                    status, NULL, 0, NULL, NULL, 0);
0263 
0264     kfree_skb(skb);
0265 }
0266 
0267 u32 nfc_hci_sak_to_protocol(u8 sak)
0268 {
0269     switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
0270     case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
0271         return NFC_PROTO_MIFARE_MASK;
0272     case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
0273         return NFC_PROTO_ISO14443_MASK;
0274     case NFC_HCI_TYPE_A_SEL_PROT_DEP:
0275         return NFC_PROTO_NFC_DEP_MASK;
0276     case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
0277         return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
0278     default:
0279         return 0xffffffff;
0280     }
0281 }
0282 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
0283 
0284 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
0285 {
0286     struct nfc_target *targets;
0287     struct sk_buff *atqa_skb = NULL;
0288     struct sk_buff *sak_skb = NULL;
0289     struct sk_buff *uid_skb = NULL;
0290     int r;
0291 
0292     pr_debug("from gate %d\n", gate);
0293 
0294     targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
0295     if (targets == NULL)
0296         return -ENOMEM;
0297 
0298     switch (gate) {
0299     case NFC_HCI_RF_READER_A_GATE:
0300         r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
0301                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
0302         if (r < 0)
0303             goto exit;
0304 
0305         r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
0306                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
0307         if (r < 0)
0308             goto exit;
0309 
0310         if (atqa_skb->len != 2 || sak_skb->len != 1) {
0311             r = -EPROTO;
0312             goto exit;
0313         }
0314 
0315         targets->supported_protocols =
0316                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
0317         if (targets->supported_protocols == 0xffffffff) {
0318             r = -EPROTO;
0319             goto exit;
0320         }
0321 
0322         targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
0323         targets->sel_res = sak_skb->data[0];
0324 
0325         r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
0326                       NFC_HCI_RF_READER_A_UID, &uid_skb);
0327         if (r < 0)
0328             goto exit;
0329 
0330         if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
0331             r = -EPROTO;
0332             goto exit;
0333         }
0334 
0335         memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
0336         targets->nfcid1_len = uid_skb->len;
0337 
0338         if (hdev->ops->complete_target_discovered) {
0339             r = hdev->ops->complete_target_discovered(hdev, gate,
0340                                   targets);
0341             if (r < 0)
0342                 goto exit;
0343         }
0344         break;
0345     case NFC_HCI_RF_READER_B_GATE:
0346         targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
0347         break;
0348     default:
0349         if (hdev->ops->target_from_gate)
0350             r = hdev->ops->target_from_gate(hdev, gate, targets);
0351         else
0352             r = -EPROTO;
0353         if (r < 0)
0354             goto exit;
0355 
0356         if (hdev->ops->complete_target_discovered) {
0357             r = hdev->ops->complete_target_discovered(hdev, gate,
0358                                   targets);
0359             if (r < 0)
0360                 goto exit;
0361         }
0362         break;
0363     }
0364 
0365     /* if driver set the new gate, we will skip the old one */
0366     if (targets->hci_reader_gate == 0x00)
0367         targets->hci_reader_gate = gate;
0368 
0369     r = nfc_targets_found(hdev->ndev, targets, 1);
0370 
0371 exit:
0372     kfree(targets);
0373     kfree_skb(atqa_skb);
0374     kfree_skb(sak_skb);
0375     kfree_skb(uid_skb);
0376 
0377     return r;
0378 }
0379 EXPORT_SYMBOL(nfc_hci_target_discovered);
0380 
0381 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
0382                 struct sk_buff *skb)
0383 {
0384     int r = 0;
0385     u8 gate;
0386 
0387     if (pipe >= NFC_HCI_MAX_PIPES) {
0388         pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
0389         goto exit;
0390     }
0391 
0392     gate = hdev->pipes[pipe].gate;
0393     if (gate == NFC_HCI_INVALID_GATE) {
0394         pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
0395         goto exit;
0396     }
0397 
0398     if (hdev->ops->event_received) {
0399         r = hdev->ops->event_received(hdev, pipe, event, skb);
0400         if (r <= 0)
0401             goto exit_noskb;
0402     }
0403 
0404     switch (event) {
0405     case NFC_HCI_EVT_TARGET_DISCOVERED:
0406         if (skb->len < 1) { /* no status data? */
0407             r = -EPROTO;
0408             goto exit;
0409         }
0410 
0411         if (skb->data[0] == 3) {
0412             /* TODO: Multiple targets in field, none activated
0413              * poll is supposedly stopped, but there is no
0414              * single target to activate, so nothing to report
0415              * up.
0416              * if we need to restart poll, we must save the
0417              * protocols from the initial poll and reuse here.
0418              */
0419         }
0420 
0421         if (skb->data[0] != 0) {
0422             r = -EPROTO;
0423             goto exit;
0424         }
0425 
0426         r = nfc_hci_target_discovered(hdev, gate);
0427         break;
0428     default:
0429         pr_info("Discarded unknown event %x to gate %x\n", event, gate);
0430         r = -EINVAL;
0431         break;
0432     }
0433 
0434 exit:
0435     kfree_skb(skb);
0436 
0437 exit_noskb:
0438     if (r)
0439         nfc_hci_driver_failure(hdev, r);
0440 }
0441 
0442 static void nfc_hci_cmd_timeout(struct timer_list *t)
0443 {
0444     struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
0445 
0446     schedule_work(&hdev->msg_tx_work);
0447 }
0448 
0449 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
0450                  const struct nfc_hci_gate *gates)
0451 {
0452     int r;
0453     while (gate_count--) {
0454         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
0455                      gates->gate, gates->pipe);
0456         if (r < 0)
0457             return r;
0458         gates++;
0459     }
0460 
0461     return 0;
0462 }
0463 
0464 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
0465 {
0466     struct sk_buff *skb = NULL;
0467     int r;
0468 
0469     if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
0470         return -EPROTO;
0471 
0472     r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
0473                  hdev->init_data.gates[0].gate,
0474                  hdev->init_data.gates[0].pipe);
0475     if (r < 0)
0476         goto exit;
0477 
0478     r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
0479                   NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
0480     if (r < 0)
0481         goto disconnect_all;
0482 
0483     if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
0484         (memcmp(hdev->init_data.session_id, skb->data,
0485                skb->len) == 0) && hdev->ops->load_session) {
0486         /* Restore gate<->pipe table from some proprietary location. */
0487 
0488         r = hdev->ops->load_session(hdev);
0489 
0490         if (r < 0)
0491             goto disconnect_all;
0492     } else {
0493 
0494         r = nfc_hci_disconnect_all_gates(hdev);
0495         if (r < 0)
0496             goto exit;
0497 
0498         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
0499                       hdev->init_data.gates);
0500         if (r < 0)
0501             goto disconnect_all;
0502 
0503         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
0504                 NFC_HCI_ADMIN_SESSION_IDENTITY,
0505                 hdev->init_data.session_id,
0506                 strlen(hdev->init_data.session_id));
0507     }
0508     if (r == 0)
0509         goto exit;
0510 
0511 disconnect_all:
0512     nfc_hci_disconnect_all_gates(hdev);
0513 
0514 exit:
0515     kfree_skb(skb);
0516 
0517     return r;
0518 }
0519 
0520 static int hci_dev_version(struct nfc_hci_dev *hdev)
0521 {
0522     int r;
0523     struct sk_buff *skb;
0524 
0525     r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
0526                   NFC_HCI_ID_MGMT_VERSION_SW, &skb);
0527     if (r == -EOPNOTSUPP) {
0528         pr_info("Software/Hardware info not available\n");
0529         return 0;
0530     }
0531     if (r < 0)
0532         return r;
0533 
0534     if (skb->len != 3) {
0535         kfree_skb(skb);
0536         return -EINVAL;
0537     }
0538 
0539     hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
0540     hdev->sw_patch = skb->data[0] & 0x0f;
0541     hdev->sw_flashlib_major = skb->data[1];
0542     hdev->sw_flashlib_minor = skb->data[2];
0543 
0544     kfree_skb(skb);
0545 
0546     r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
0547                   NFC_HCI_ID_MGMT_VERSION_HW, &skb);
0548     if (r < 0)
0549         return r;
0550 
0551     if (skb->len != 3) {
0552         kfree_skb(skb);
0553         return -EINVAL;
0554     }
0555 
0556     hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
0557     hdev->hw_version = skb->data[0] & 0x1f;
0558     hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
0559     hdev->hw_software = skb->data[1] & 0x3f;
0560     hdev->hw_bsid = skb->data[2];
0561 
0562     kfree_skb(skb);
0563 
0564     pr_info("SOFTWARE INFO:\n");
0565     pr_info("RomLib         : %d\n", hdev->sw_romlib);
0566     pr_info("Patch          : %d\n", hdev->sw_patch);
0567     pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
0568     pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
0569     pr_info("HARDWARE INFO:\n");
0570     pr_info("Derivative     : %d\n", hdev->hw_derivative);
0571     pr_info("HW Version     : %d\n", hdev->hw_version);
0572     pr_info("#MPW           : %d\n", hdev->hw_mpw);
0573     pr_info("Software       : %d\n", hdev->hw_software);
0574     pr_info("BSID Version   : %d\n", hdev->hw_bsid);
0575 
0576     return 0;
0577 }
0578 
0579 static int hci_dev_up(struct nfc_dev *nfc_dev)
0580 {
0581     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0582     int r = 0;
0583 
0584     if (hdev->ops->open) {
0585         r = hdev->ops->open(hdev);
0586         if (r < 0)
0587             return r;
0588     }
0589 
0590     r = nfc_llc_start(hdev->llc);
0591     if (r < 0)
0592         goto exit_close;
0593 
0594     r = hci_dev_session_init(hdev);
0595     if (r < 0)
0596         goto exit_llc;
0597 
0598     r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
0599                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
0600     if (r < 0)
0601         goto exit_llc;
0602 
0603     if (hdev->ops->hci_ready) {
0604         r = hdev->ops->hci_ready(hdev);
0605         if (r < 0)
0606             goto exit_llc;
0607     }
0608 
0609     r = hci_dev_version(hdev);
0610     if (r < 0)
0611         goto exit_llc;
0612 
0613     return 0;
0614 
0615 exit_llc:
0616     nfc_llc_stop(hdev->llc);
0617 
0618 exit_close:
0619     if (hdev->ops->close)
0620         hdev->ops->close(hdev);
0621 
0622     return r;
0623 }
0624 
0625 static int hci_dev_down(struct nfc_dev *nfc_dev)
0626 {
0627     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0628 
0629     nfc_llc_stop(hdev->llc);
0630 
0631     if (hdev->ops->close)
0632         hdev->ops->close(hdev);
0633 
0634     nfc_hci_reset_pipes(hdev);
0635 
0636     return 0;
0637 }
0638 
0639 static int hci_start_poll(struct nfc_dev *nfc_dev,
0640               u32 im_protocols, u32 tm_protocols)
0641 {
0642     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0643 
0644     if (hdev->ops->start_poll)
0645         return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
0646     else
0647         return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
0648                       NFC_HCI_EVT_READER_REQUESTED,
0649                       NULL, 0);
0650 }
0651 
0652 static void hci_stop_poll(struct nfc_dev *nfc_dev)
0653 {
0654     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0655 
0656     if (hdev->ops->stop_poll)
0657         hdev->ops->stop_poll(hdev);
0658     else
0659         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
0660                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
0661 }
0662 
0663 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
0664                 __u8 comm_mode, __u8 *gb, size_t gb_len)
0665 {
0666     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0667 
0668     if (!hdev->ops->dep_link_up)
0669         return 0;
0670 
0671     return hdev->ops->dep_link_up(hdev, target, comm_mode,
0672                       gb, gb_len);
0673 }
0674 
0675 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
0676 {
0677     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0678 
0679     if (!hdev->ops->dep_link_down)
0680         return 0;
0681 
0682     return hdev->ops->dep_link_down(hdev);
0683 }
0684 
0685 static int hci_activate_target(struct nfc_dev *nfc_dev,
0686                    struct nfc_target *target, u32 protocol)
0687 {
0688     return 0;
0689 }
0690 
0691 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
0692                   struct nfc_target *target,
0693                   u8 mode)
0694 {
0695 }
0696 
0697 #define HCI_CB_TYPE_TRANSCEIVE 1
0698 
0699 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
0700 {
0701     struct nfc_hci_dev *hdev = context;
0702 
0703     switch (hdev->async_cb_type) {
0704     case HCI_CB_TYPE_TRANSCEIVE:
0705         /*
0706          * TODO: Check RF Error indicator to make sure data is valid.
0707          * It seems that HCI cmd can complete without error, but data
0708          * can be invalid if an RF error occurred? Ignore for now.
0709          */
0710         if (err == 0)
0711             skb_trim(skb, skb->len - 1); /* RF Err ind */
0712 
0713         hdev->async_cb(hdev->async_cb_context, skb, err);
0714         break;
0715     default:
0716         if (err == 0)
0717             kfree_skb(skb);
0718         break;
0719     }
0720 }
0721 
0722 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
0723               struct sk_buff *skb, data_exchange_cb_t cb,
0724               void *cb_context)
0725 {
0726     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0727     int r;
0728 
0729     pr_debug("target_idx=%d\n", target->idx);
0730 
0731     switch (target->hci_reader_gate) {
0732     case NFC_HCI_RF_READER_A_GATE:
0733     case NFC_HCI_RF_READER_B_GATE:
0734         if (hdev->ops->im_transceive) {
0735             r = hdev->ops->im_transceive(hdev, target, skb, cb,
0736                              cb_context);
0737             if (r <= 0) /* handled */
0738                 break;
0739         }
0740 
0741         *(u8 *)skb_push(skb, 1) = 0;    /* CTR, see spec:10.2.2.1 */
0742 
0743         hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
0744         hdev->async_cb = cb;
0745         hdev->async_cb_context = cb_context;
0746 
0747         r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
0748                        NFC_HCI_WR_XCHG_DATA, skb->data,
0749                        skb->len, hci_transceive_cb, hdev);
0750         break;
0751     default:
0752         if (hdev->ops->im_transceive) {
0753             r = hdev->ops->im_transceive(hdev, target, skb, cb,
0754                              cb_context);
0755             if (r == 1)
0756                 r = -ENOTSUPP;
0757         } else {
0758             r = -ENOTSUPP;
0759         }
0760         break;
0761     }
0762 
0763     kfree_skb(skb);
0764 
0765     return r;
0766 }
0767 
0768 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
0769 {
0770     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0771 
0772     if (!hdev->ops->tm_send) {
0773         kfree_skb(skb);
0774         return -ENOTSUPP;
0775     }
0776 
0777     return hdev->ops->tm_send(hdev, skb);
0778 }
0779 
0780 static int hci_check_presence(struct nfc_dev *nfc_dev,
0781                   struct nfc_target *target)
0782 {
0783     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0784 
0785     if (!hdev->ops->check_presence)
0786         return 0;
0787 
0788     return hdev->ops->check_presence(hdev, target);
0789 }
0790 
0791 static int hci_discover_se(struct nfc_dev *nfc_dev)
0792 {
0793     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0794 
0795     if (hdev->ops->discover_se)
0796         return hdev->ops->discover_se(hdev);
0797 
0798     return 0;
0799 }
0800 
0801 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
0802 {
0803     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0804 
0805     if (hdev->ops->enable_se)
0806         return hdev->ops->enable_se(hdev, se_idx);
0807 
0808     return 0;
0809 }
0810 
0811 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
0812 {
0813     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0814 
0815     if (hdev->ops->disable_se)
0816         return hdev->ops->disable_se(hdev, se_idx);
0817 
0818     return 0;
0819 }
0820 
0821 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
0822              u8 *apdu, size_t apdu_length,
0823              se_io_cb_t cb, void *cb_context)
0824 {
0825     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0826 
0827     if (hdev->ops->se_io)
0828         return hdev->ops->se_io(hdev, se_idx, apdu,
0829                     apdu_length, cb, cb_context);
0830 
0831     return 0;
0832 }
0833 
0834 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
0835 {
0836     mutex_lock(&hdev->msg_tx_mutex);
0837 
0838     if (hdev->cmd_pending_msg == NULL) {
0839         nfc_driver_failure(hdev->ndev, err);
0840         goto exit;
0841     }
0842 
0843     __nfc_hci_cmd_completion(hdev, err, NULL);
0844 
0845 exit:
0846     mutex_unlock(&hdev->msg_tx_mutex);
0847 }
0848 
0849 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
0850 {
0851     nfc_hci_failure(hdev, err);
0852 }
0853 
0854 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
0855 {
0856     struct hcp_packet *packet;
0857     u8 type;
0858     u8 instruction;
0859     struct sk_buff *hcp_skb;
0860     u8 pipe;
0861     struct sk_buff *frag_skb;
0862     int msg_len;
0863 
0864     packet = (struct hcp_packet *)skb->data;
0865     if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
0866         skb_queue_tail(&hdev->rx_hcp_frags, skb);
0867         return;
0868     }
0869 
0870     /* it's the last fragment. Does it need re-aggregation? */
0871     if (skb_queue_len(&hdev->rx_hcp_frags)) {
0872         pipe = packet->header & NFC_HCI_FRAGMENT;
0873         skb_queue_tail(&hdev->rx_hcp_frags, skb);
0874 
0875         msg_len = 0;
0876         skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
0877             msg_len += (frag_skb->len -
0878                     NFC_HCI_HCP_PACKET_HEADER_LEN);
0879         }
0880 
0881         hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
0882                          msg_len, GFP_KERNEL);
0883         if (hcp_skb == NULL) {
0884             nfc_hci_failure(hdev, -ENOMEM);
0885             return;
0886         }
0887 
0888         skb_put_u8(hcp_skb, pipe);
0889 
0890         skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
0891             msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
0892             skb_put_data(hcp_skb,
0893                      frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
0894                      msg_len);
0895         }
0896 
0897         skb_queue_purge(&hdev->rx_hcp_frags);
0898     } else {
0899         packet->header &= NFC_HCI_FRAGMENT;
0900         hcp_skb = skb;
0901     }
0902 
0903     /* if this is a response, dispatch immediately to
0904      * unblock waiting cmd context. Otherwise, enqueue to dispatch
0905      * in separate context where handler can also execute command.
0906      */
0907     packet = (struct hcp_packet *)hcp_skb->data;
0908     type = HCP_MSG_GET_TYPE(packet->message.header);
0909     if (type == NFC_HCI_HCP_RESPONSE) {
0910         pipe = packet->header;
0911         instruction = HCP_MSG_GET_CMD(packet->message.header);
0912         skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
0913              NFC_HCI_HCP_MESSAGE_HEADER_LEN);
0914         nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
0915     } else {
0916         skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
0917         schedule_work(&hdev->msg_rx_work);
0918     }
0919 }
0920 
0921 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
0922 {
0923     struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
0924 
0925     if (!hdev->ops->fw_download)
0926         return -ENOTSUPP;
0927 
0928     return hdev->ops->fw_download(hdev, firmware_name);
0929 }
0930 
0931 static const struct nfc_ops hci_nfc_ops = {
0932     .dev_up = hci_dev_up,
0933     .dev_down = hci_dev_down,
0934     .start_poll = hci_start_poll,
0935     .stop_poll = hci_stop_poll,
0936     .dep_link_up = hci_dep_link_up,
0937     .dep_link_down = hci_dep_link_down,
0938     .activate_target = hci_activate_target,
0939     .deactivate_target = hci_deactivate_target,
0940     .im_transceive = hci_transceive,
0941     .tm_send = hci_tm_send,
0942     .check_presence = hci_check_presence,
0943     .fw_download = hci_fw_download,
0944     .discover_se = hci_discover_se,
0945     .enable_se = hci_enable_se,
0946     .disable_se = hci_disable_se,
0947     .se_io = hci_se_io,
0948 };
0949 
0950 struct nfc_hci_dev *nfc_hci_allocate_device(const struct nfc_hci_ops *ops,
0951                         struct nfc_hci_init_data *init_data,
0952                         unsigned long quirks,
0953                         u32 protocols,
0954                         const char *llc_name,
0955                         int tx_headroom,
0956                         int tx_tailroom,
0957                         int max_link_payload)
0958 {
0959     struct nfc_hci_dev *hdev;
0960 
0961     if (ops->xmit == NULL)
0962         return NULL;
0963 
0964     if (protocols == 0)
0965         return NULL;
0966 
0967     hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
0968     if (hdev == NULL)
0969         return NULL;
0970 
0971     hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
0972                      nfc_hci_recv_from_llc, tx_headroom,
0973                      tx_tailroom, nfc_hci_llc_failure);
0974     if (hdev->llc == NULL) {
0975         kfree(hdev);
0976         return NULL;
0977     }
0978 
0979     hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
0980                      tx_headroom + HCI_CMDS_HEADROOM,
0981                      tx_tailroom);
0982     if (!hdev->ndev) {
0983         nfc_llc_free(hdev->llc);
0984         kfree(hdev);
0985         return NULL;
0986     }
0987 
0988     hdev->ops = ops;
0989     hdev->max_data_link_payload = max_link_payload;
0990     hdev->init_data = *init_data;
0991 
0992     nfc_set_drvdata(hdev->ndev, hdev);
0993 
0994     nfc_hci_reset_pipes(hdev);
0995 
0996     hdev->quirks = quirks;
0997 
0998     return hdev;
0999 }
1000 EXPORT_SYMBOL(nfc_hci_allocate_device);
1001 
1002 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1003 {
1004     nfc_free_device(hdev->ndev);
1005     nfc_llc_free(hdev->llc);
1006     kfree(hdev);
1007 }
1008 EXPORT_SYMBOL(nfc_hci_free_device);
1009 
1010 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1011 {
1012     mutex_init(&hdev->msg_tx_mutex);
1013 
1014     INIT_LIST_HEAD(&hdev->msg_tx_queue);
1015 
1016     INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1017 
1018     timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1019 
1020     skb_queue_head_init(&hdev->rx_hcp_frags);
1021 
1022     INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1023 
1024     skb_queue_head_init(&hdev->msg_rx_queue);
1025 
1026     return nfc_register_device(hdev->ndev);
1027 }
1028 EXPORT_SYMBOL(nfc_hci_register_device);
1029 
1030 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1031 {
1032     struct hci_msg *msg, *n;
1033 
1034     mutex_lock(&hdev->msg_tx_mutex);
1035 
1036     if (hdev->cmd_pending_msg) {
1037         if (hdev->cmd_pending_msg->cb)
1038             hdev->cmd_pending_msg->cb(
1039                          hdev->cmd_pending_msg->cb_context,
1040                          NULL, -ESHUTDOWN);
1041         kfree(hdev->cmd_pending_msg);
1042         hdev->cmd_pending_msg = NULL;
1043     }
1044 
1045     hdev->shutting_down = true;
1046 
1047     mutex_unlock(&hdev->msg_tx_mutex);
1048 
1049     del_timer_sync(&hdev->cmd_timer);
1050     cancel_work_sync(&hdev->msg_tx_work);
1051 
1052     cancel_work_sync(&hdev->msg_rx_work);
1053 
1054     nfc_unregister_device(hdev->ndev);
1055 
1056     skb_queue_purge(&hdev->rx_hcp_frags);
1057     skb_queue_purge(&hdev->msg_rx_queue);
1058 
1059     list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1060         list_del(&msg->msg_l);
1061         skb_queue_purge(&msg->msg_frags);
1062         kfree(msg);
1063     }
1064 }
1065 EXPORT_SYMBOL(nfc_hci_unregister_device);
1066 
1067 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1068 {
1069     hdev->clientdata = clientdata;
1070 }
1071 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1072 
1073 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1074 {
1075     return hdev->clientdata;
1076 }
1077 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1078 
1079 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1080 {
1081     nfc_hci_failure(hdev, err);
1082 }
1083 EXPORT_SYMBOL(nfc_hci_driver_failure);
1084 
1085 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1086 {
1087     nfc_llc_rcv_from_drv(hdev->llc, skb);
1088 }
1089 EXPORT_SYMBOL(nfc_hci_recv_frame);
1090 
1091 static int __init nfc_hci_init(void)
1092 {
1093     return nfc_llc_init();
1094 }
1095 
1096 static void __exit nfc_hci_exit(void)
1097 {
1098     nfc_llc_exit();
1099 }
1100 
1101 subsys_initcall(nfc_hci_init);
1102 module_exit(nfc_hci_exit);
1103 
1104 MODULE_LICENSE("GPL");
1105 MODULE_DESCRIPTION("NFC HCI Core");
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