/* * NCI based Driver for STMicroelectronics NFC Chip * * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . */ #include #include #include #include #include #include "st21nfcb.h" #include "st21nfcb_se.h" struct st21nfcb_pipe_info { u8 pipe_state; u8 src_host_id; u8 src_gate_id; u8 dst_host_id; u8 dst_gate_id; } __packed; /* Hosts */ #define ST21NFCB_HOST_CONTROLLER_ID 0x00 #define ST21NFCB_TERMINAL_HOST_ID 0x01 #define ST21NFCB_UICC_HOST_ID 0x02 #define ST21NFCB_ESE_HOST_ID 0xc0 /* Gates */ #define ST21NFCB_DEVICE_MGNT_GATE 0x01 #define ST21NFCB_APDU_READER_GATE 0xf0 #define ST21NFCB_CONNECTIVITY_GATE 0x41 /* Pipes */ #define ST21NFCB_DEVICE_MGNT_PIPE 0x02 /* Connectivity pipe only */ #define ST21NFCB_SE_COUNT_PIPE_UICC 0x01 /* Connectivity + APDU Reader pipe */ #define ST21NFCB_SE_COUNT_PIPE_EMBEDDED 0x02 #define ST21NFCB_SE_TO_HOT_PLUG 1000 /* msecs */ #define ST21NFCB_SE_TO_PIPES 2000 #define ST21NFCB_EVT_HOT_PLUG_IS_INHIBITED(x) (x->data[0] & 0x80) #define NCI_HCI_APDU_PARAM_ATR 0x01 #define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01 #define NCI_HCI_ADMIN_PARAM_WHITELIST 0x03 #define NCI_HCI_ADMIN_PARAM_HOST_LIST 0x04 #define ST21NFCB_EVT_SE_HARD_RESET 0x20 #define ST21NFCB_EVT_TRANSMIT_DATA 0x10 #define ST21NFCB_EVT_WTX_REQUEST 0x11 #define ST21NFCB_EVT_SE_SOFT_RESET 0x11 #define ST21NFCB_EVT_SE_END_OF_APDU_TRANSFER 0x21 #define ST21NFCB_EVT_HOT_PLUG 0x03 #define ST21NFCB_SE_MODE_OFF 0x00 #define ST21NFCB_SE_MODE_ON 0x01 #define ST21NFCB_EVT_CONNECTIVITY 0x10 #define ST21NFCB_EVT_TRANSACTION 0x12 #define ST21NFCB_DM_GETINFO 0x13 #define ST21NFCB_DM_GETINFO_PIPE_LIST 0x02 #define ST21NFCB_DM_GETINFO_PIPE_INFO 0x01 #define ST21NFCB_DM_PIPE_CREATED 0x02 #define ST21NFCB_DM_PIPE_OPEN 0x04 #define ST21NFCB_DM_RF_ACTIVE 0x80 #define ST21NFCB_DM_DISCONNECT 0x30 #define ST21NFCB_DM_IS_PIPE_OPEN(p) \ ((p & 0x0f) == (ST21NFCB_DM_PIPE_CREATED | ST21NFCB_DM_PIPE_OPEN)) #define ST21NFCB_ATR_DEFAULT_BWI 0x04 /* * WT = 2^BWI/10[s], convert into msecs and add a secure * room by increasing by 2 this timeout */ #define ST21NFCB_BWI_TO_TIMEOUT(x) ((1 << x) * 200) #define ST21NFCB_ATR_GET_Y_FROM_TD(x) (x >> 4) /* If TA is present bit 0 is set */ #define ST21NFCB_ATR_TA_PRESENT(x) (x & 0x01) /* If TB is present bit 1 is set */ #define ST21NFCB_ATR_TB_PRESENT(x) (x & 0x02) #define ST21NFCB_NUM_DEVICES 256 static DECLARE_BITMAP(dev_mask, ST21NFCB_NUM_DEVICES); /* Here are the mandatory pipe for st21nfcb */ static struct nci_hci_gate st21nfcb_gates[] = { {NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PIPE, ST21NFCB_HOST_CONTROLLER_ID}, {NCI_HCI_LINK_MGMT_GATE, NCI_HCI_LINK_MGMT_PIPE, ST21NFCB_HOST_CONTROLLER_ID}, {ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_DEVICE_MGNT_PIPE, ST21NFCB_HOST_CONTROLLER_ID}, /* Secure element pipes are created by secure element host */ {ST21NFCB_CONNECTIVITY_GATE, NCI_HCI_DO_NOT_OPEN_PIPE, ST21NFCB_HOST_CONTROLLER_ID}, {ST21NFCB_APDU_READER_GATE, NCI_HCI_DO_NOT_OPEN_PIPE, ST21NFCB_HOST_CONTROLLER_ID}, }; static u8 st21nfcb_se_get_bwi(struct nci_dev *ndev) { int i; u8 td; struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); /* Bits 8 to 5 of the first TB for T=1 encode BWI from zero to nine */ for (i = 1; i < ST21NFCB_ESE_MAX_LENGTH; i++) { td = ST21NFCB_ATR_GET_Y_FROM_TD(info->se_info.atr[i]); if (ST21NFCB_ATR_TA_PRESENT(td)) i++; if (ST21NFCB_ATR_TB_PRESENT(td)) { i++; return info->se_info.atr[i] >> 4; } } return ST21NFCB_ATR_DEFAULT_BWI; } static void st21nfcb_se_get_atr(struct nci_dev *ndev) { struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); int r; struct sk_buff *skb; r = nci_hci_get_param(ndev, ST21NFCB_APDU_READER_GATE, NCI_HCI_APDU_PARAM_ATR, &skb); if (r < 0) return; if (skb->len <= ST21NFCB_ESE_MAX_LENGTH) { memcpy(info->se_info.atr, skb->data, skb->len); info->se_info.wt_timeout = ST21NFCB_BWI_TO_TIMEOUT(st21nfcb_se_get_bwi(ndev)); } kfree_skb(skb); } int st21nfcb_hci_load_session(struct nci_dev *ndev) { int i, j, r; struct sk_buff *skb_pipe_list, *skb_pipe_info; struct st21nfcb_pipe_info *dm_pipe_info; u8 pipe_list[] = { ST21NFCB_DM_GETINFO_PIPE_LIST, ST21NFCB_TERMINAL_HOST_ID}; u8 pipe_info[] = { ST21NFCB_DM_GETINFO_PIPE_INFO, ST21NFCB_TERMINAL_HOST_ID, 0}; /* On ST21NFCB device pipes number are dynamics * If pipes are already created, hci_dev_up will fail. * Doing a clear all pipe is a bad idea because: * - It does useless EEPROM cycling * - It might cause issue for secure elements support * (such as removing connectivity or APDU reader pipe) * A better approach on ST21NFCB is to: * - get a pipe list for each host. * (eg: ST21NFCB_HOST_CONTROLLER_ID for now). * (TODO Later on UICC HOST and eSE HOST) * - get pipe information * - match retrieved pipe list in st21nfcb_gates * ST21NFCB_DEVICE_MGNT_GATE is a proprietary gate * with ST21NFCB_DEVICE_MGNT_PIPE. * Pipe can be closed and need to be open. */ r = nci_hci_connect_gate(ndev, ST21NFCB_HOST_CONTROLLER_ID, ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_DEVICE_MGNT_PIPE); if (r < 0) goto free_info; /* Get pipe list */ r = nci_hci_send_cmd(ndev, ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_DM_GETINFO, pipe_list, sizeof(pipe_list), &skb_pipe_list); if (r < 0) goto free_info; /* Complete the existing gate_pipe table */ for (i = 0; i < skb_pipe_list->len; i++) { pipe_info[2] = skb_pipe_list->data[i]; r = nci_hci_send_cmd(ndev, ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_DM_GETINFO, pipe_info, sizeof(pipe_info), &skb_pipe_info); if (r) continue; /* * Match pipe ID and gate ID * Output format from ST21NFC_DM_GETINFO is: * - pipe state (1byte) * - source hid (1byte) * - source gid (1byte) * - destination hid (1byte) * - destination gid (1byte) */ dm_pipe_info = (struct st21nfcb_pipe_info *)skb_pipe_info->data; if (dm_pipe_info->dst_gate_id == ST21NFCB_APDU_READER_GATE && dm_pipe_info->src_host_id != ST21NFCB_ESE_HOST_ID) { pr_err("Unexpected apdu_reader pipe on host %x\n", dm_pipe_info->src_host_id); continue; } for (j = 0; (j < ARRAY_SIZE(st21nfcb_gates)) && (st21nfcb_gates[j].gate != dm_pipe_info->dst_gate_id); j++) ; if (j < ARRAY_SIZE(st21nfcb_gates) && st21nfcb_gates[j].gate == dm_pipe_info->dst_gate_id && ST21NFCB_DM_IS_PIPE_OPEN(dm_pipe_info->pipe_state)) { st21nfcb_gates[j].pipe = pipe_info[2]; ndev->hci_dev->gate2pipe[st21nfcb_gates[j].gate] = st21nfcb_gates[j].pipe; ndev->hci_dev->pipes[st21nfcb_gates[j].pipe].gate = st21nfcb_gates[j].gate; ndev->hci_dev->pipes[st21nfcb_gates[j].pipe].host = dm_pipe_info->src_host_id; } } memcpy(ndev->hci_dev->init_data.gates, st21nfcb_gates, sizeof(st21nfcb_gates)); free_info: kfree_skb(skb_pipe_info); kfree_skb(skb_pipe_list); return r; } EXPORT_SYMBOL_GPL(st21nfcb_hci_load_session); static void st21nfcb_hci_admin_event_received(struct nci_dev *ndev, u8 event, struct sk_buff *skb) { struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); switch (event) { case ST21NFCB_EVT_HOT_PLUG: if (info->se_info.se_active) { if (!ST21NFCB_EVT_HOT_PLUG_IS_INHIBITED(skb)) { del_timer_sync(&info->se_info.se_active_timer); info->se_info.se_active = false; complete(&info->se_info.req_completion); } else { mod_timer(&info->se_info.se_active_timer, jiffies + msecs_to_jiffies(ST21NFCB_SE_TO_PIPES)); } } break; } } static int st21nfcb_hci_apdu_reader_event_received(struct nci_dev *ndev, u8 event, struct sk_buff *skb) { int r = 0; struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); pr_debug("apdu reader gate event: %x\n", event); switch (event) { case ST21NFCB_EVT_TRANSMIT_DATA: del_timer_sync(&info->se_info.bwi_timer); info->se_info.bwi_active = false; info->se_info.cb(info->se_info.cb_context, skb->data, skb->len, 0); break; case ST21NFCB_EVT_WTX_REQUEST: mod_timer(&info->se_info.bwi_timer, jiffies + msecs_to_jiffies(info->se_info.wt_timeout)); break; } kfree_skb(skb); return r; } /* * Returns: * <= 0: driver handled the event, skb consumed * 1: driver does not handle the event, please do standard processing */ static int st21nfcb_hci_connectivity_event_received(struct nci_dev *ndev, u8 host, u8 event, struct sk_buff *skb) { int r = 0; struct device *dev = &ndev->nfc_dev->dev; struct nfc_evt_transaction *transaction; pr_debug("connectivity gate event: %x\n", event); switch (event) { case ST21NFCB_EVT_CONNECTIVITY: break; case ST21NFCB_EVT_TRANSACTION: /* According to specification etsi 102 622 * 11.2.2.4 EVT_TRANSACTION Table 52 * Description Tag Length * AID 81 5 to 16 * PARAMETERS 82 0 to 255 */ if (skb->len < NFC_MIN_AID_LENGTH + 2 && skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG) return -EPROTO; transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev, skb->len - 2, GFP_KERNEL); transaction->aid_len = skb->data[1]; memcpy(transaction->aid, &skb->data[2], transaction->aid_len); /* Check next byte is PARAMETERS tag (82) */ if (skb->data[transaction->aid_len + 2] != NFC_EVT_TRANSACTION_PARAMS_TAG) return -EPROTO; transaction->params_len = skb->data[transaction->aid_len + 3]; memcpy(transaction->params, skb->data + transaction->aid_len + 4, transaction->params_len); r = nfc_se_transaction(ndev->nfc_dev, host, transaction); break; default: return 1; } kfree_skb(skb); return r; } void st21nfcb_hci_event_received(struct nci_dev *ndev, u8 pipe, u8 event, struct sk_buff *skb) { u8 gate = ndev->hci_dev->pipes[pipe].gate; u8 host = ndev->hci_dev->pipes[pipe].host; switch (gate) { case NCI_HCI_ADMIN_GATE: st21nfcb_hci_admin_event_received(ndev, event, skb); break; case ST21NFCB_APDU_READER_GATE: st21nfcb_hci_apdu_reader_event_received(ndev, event, skb); break; case ST21NFCB_CONNECTIVITY_GATE: st21nfcb_hci_connectivity_event_received(ndev, host, event, skb); break; } } EXPORT_SYMBOL_GPL(st21nfcb_hci_event_received); void st21nfcb_hci_cmd_received(struct nci_dev *ndev, u8 pipe, u8 cmd, struct sk_buff *skb) { struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); u8 gate = ndev->hci_dev->pipes[pipe].gate; pr_debug("cmd: %x\n", cmd); switch (cmd) { case NCI_HCI_ANY_OPEN_PIPE: if (gate != ST21NFCB_APDU_READER_GATE && ndev->hci_dev->pipes[pipe].host != ST21NFCB_UICC_HOST_ID) ndev->hci_dev->count_pipes++; if (ndev->hci_dev->count_pipes == ndev->hci_dev->expected_pipes) { del_timer_sync(&info->se_info.se_active_timer); info->se_info.se_active = false; ndev->hci_dev->count_pipes = 0; complete(&info->se_info.req_completion); } break; } } EXPORT_SYMBOL_GPL(st21nfcb_hci_cmd_received); /* * Remarks: On some early st21nfcb firmware, nci_nfcee_mode_set(0) * is rejected */ static int st21nfcb_nci_control_se(struct nci_dev *ndev, u8 se_idx, u8 state) { struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); int r; struct sk_buff *sk_host_list; u8 host_id; switch (se_idx) { case ST21NFCB_UICC_HOST_ID: ndev->hci_dev->count_pipes = 0; ndev->hci_dev->expected_pipes = ST21NFCB_SE_COUNT_PIPE_UICC; break; case ST21NFCB_ESE_HOST_ID: ndev->hci_dev->count_pipes = 0; ndev->hci_dev->expected_pipes = ST21NFCB_SE_COUNT_PIPE_EMBEDDED; break; default: return -EINVAL; } /* * Wait for an EVT_HOT_PLUG in order to * retrieve a relevant host list. */ reinit_completion(&info->se_info.req_completion); r = nci_nfcee_mode_set(ndev, se_idx, NCI_NFCEE_ENABLE); if (r != NCI_STATUS_OK) return r; mod_timer(&info->se_info.se_active_timer, jiffies + msecs_to_jiffies(ST21NFCB_SE_TO_HOT_PLUG)); info->se_info.se_active = true; /* Ignore return value and check in any case the host_list */ wait_for_completion_interruptible(&info->se_info.req_completion); /* There might be some "collision" after receiving a HOT_PLUG event * This may cause the CLF to not answer to the next hci command. * There is no possible synchronization to prevent this. * Adding a small delay is the only way to solve the issue. */ usleep_range(3000, 5000); r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PARAM_HOST_LIST, &sk_host_list); if (r != NCI_HCI_ANY_OK) return r; host_id = sk_host_list->data[sk_host_list->len - 1]; kfree_skb(sk_host_list); if (state == ST21NFCB_SE_MODE_ON && host_id == se_idx) return se_idx; else if (state == ST21NFCB_SE_MODE_OFF && host_id != se_idx) return se_idx; return -1; } int st21nfcb_nci_disable_se(struct nci_dev *ndev, u32 se_idx) { int r; pr_debug("st21nfcb_nci_disable_se\n"); if (se_idx == NFC_SE_EMBEDDED) { r = nci_hci_send_event(ndev, ST21NFCB_APDU_READER_GATE, ST21NFCB_EVT_SE_END_OF_APDU_TRANSFER, NULL, 0); if (r < 0) return r; } return 0; } EXPORT_SYMBOL_GPL(st21nfcb_nci_disable_se); int st21nfcb_nci_enable_se(struct nci_dev *ndev, u32 se_idx) { int r; pr_debug("st21nfcb_nci_enable_se\n"); if (se_idx == ST21NFCB_HCI_HOST_ID_ESE) { r = nci_hci_send_event(ndev, ST21NFCB_APDU_READER_GATE, ST21NFCB_EVT_SE_SOFT_RESET, NULL, 0); if (r < 0) return r; } return 0; } EXPORT_SYMBOL_GPL(st21nfcb_nci_enable_se); static int st21nfcb_hci_network_init(struct nci_dev *ndev) { struct core_conn_create_dest_spec_params *dest_params; struct dest_spec_params spec_params; struct nci_conn_info *conn_info; int r, dev_num; dest_params = kzalloc(sizeof(struct core_conn_create_dest_spec_params) + sizeof(struct dest_spec_params), GFP_KERNEL); if (dest_params == NULL) { r = -ENOMEM; goto exit; } dest_params->type = NCI_DESTINATION_SPECIFIC_PARAM_NFCEE_TYPE; dest_params->length = sizeof(struct dest_spec_params); spec_params.id = ndev->hci_dev->nfcee_id; spec_params.protocol = NCI_NFCEE_INTERFACE_HCI_ACCESS; memcpy(dest_params->value, &spec_params, sizeof(struct dest_spec_params)); r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCEE, 1, sizeof(struct core_conn_create_dest_spec_params) + sizeof(struct dest_spec_params), dest_params); if (r != NCI_STATUS_OK) goto free_dest_params; conn_info = ndev->hci_dev->conn_info; if (!conn_info) goto free_dest_params; memcpy(ndev->hci_dev->init_data.gates, st21nfcb_gates, sizeof(st21nfcb_gates)); /* * Session id must include the driver name + i2c bus addr * persistent info to discriminate 2 identical chips */ dev_num = find_first_zero_bit(dev_mask, ST21NFCB_NUM_DEVICES); if (dev_num >= ST21NFCB_NUM_DEVICES) { r = -ENODEV; goto free_dest_params; } scnprintf(ndev->hci_dev->init_data.session_id, sizeof(ndev->hci_dev->init_data.session_id), "%s%2x", "ST21BH", dev_num); r = nci_hci_dev_session_init(ndev); if (r != NCI_HCI_ANY_OK) goto free_dest_params; r = nci_nfcee_mode_set(ndev, ndev->hci_dev->conn_info->id, NCI_NFCEE_ENABLE); if (r != NCI_STATUS_OK) goto free_dest_params; free_dest_params: kfree(dest_params); exit: return r; } int st21nfcb_nci_discover_se(struct nci_dev *ndev) { u8 param[2]; int r; int se_count = 0; pr_debug("st21nfcb_nci_discover_se\n"); r = st21nfcb_hci_network_init(ndev); if (r != 0) return r; param[0] = ST21NFCB_UICC_HOST_ID; param[1] = ST21NFCB_HCI_HOST_ID_ESE; r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE, NCI_HCI_ADMIN_PARAM_WHITELIST, param, sizeof(param)); if (r != NCI_HCI_ANY_OK) return r; r = st21nfcb_nci_control_se(ndev, ST21NFCB_UICC_HOST_ID, ST21NFCB_SE_MODE_ON); if (r == ST21NFCB_UICC_HOST_ID) { nfc_add_se(ndev->nfc_dev, ST21NFCB_UICC_HOST_ID, NFC_SE_UICC); se_count++; } /* Try to enable eSE in order to check availability */ r = st21nfcb_nci_control_se(ndev, ST21NFCB_HCI_HOST_ID_ESE, ST21NFCB_SE_MODE_ON); if (r == ST21NFCB_HCI_HOST_ID_ESE) { nfc_add_se(ndev->nfc_dev, ST21NFCB_HCI_HOST_ID_ESE, NFC_SE_EMBEDDED); se_count++; st21nfcb_se_get_atr(ndev); } return !se_count; } EXPORT_SYMBOL_GPL(st21nfcb_nci_discover_se); int st21nfcb_nci_se_io(struct nci_dev *ndev, u32 se_idx, u8 *apdu, size_t apdu_length, se_io_cb_t cb, void *cb_context) { struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); pr_debug("\n"); switch (se_idx) { case ST21NFCB_HCI_HOST_ID_ESE: info->se_info.cb = cb; info->se_info.cb_context = cb_context; mod_timer(&info->se_info.bwi_timer, jiffies + msecs_to_jiffies(info->se_info.wt_timeout)); info->se_info.bwi_active = true; return nci_hci_send_event(ndev, ST21NFCB_APDU_READER_GATE, ST21NFCB_EVT_TRANSMIT_DATA, apdu, apdu_length); default: return -ENODEV; } } EXPORT_SYMBOL(st21nfcb_nci_se_io); static void st21nfcb_se_wt_timeout(unsigned long data) { /* * No answer from the secure element * within the defined timeout. * Let's send a reset request as recovery procedure. * According to the situation, we first try to send a software reset * to the secure element. If the next command is still not * answering in time, we send to the CLF a secure element hardware * reset request. */ /* hardware reset managed through VCC_UICC_OUT power supply */ u8 param = 0x01; struct st21nfcb_nci_info *info = (struct st21nfcb_nci_info *) data; pr_debug("\n"); info->se_info.bwi_active = false; if (!info->se_info.xch_error) { info->se_info.xch_error = true; nci_hci_send_event(info->ndlc->ndev, ST21NFCB_APDU_READER_GATE, ST21NFCB_EVT_SE_SOFT_RESET, NULL, 0); } else { info->se_info.xch_error = false; nci_hci_send_event(info->ndlc->ndev, ST21NFCB_DEVICE_MGNT_GATE, ST21NFCB_EVT_SE_HARD_RESET, ¶m, 1); } info->se_info.cb(info->se_info.cb_context, NULL, 0, -ETIME); } static void st21nfcb_se_activation_timeout(unsigned long data) { struct st21nfcb_nci_info *info = (struct st21nfcb_nci_info *) data; pr_debug("\n"); info->se_info.se_active = false; complete(&info->se_info.req_completion); } int st21nfcb_se_init(struct nci_dev *ndev) { struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); init_completion(&info->se_info.req_completion); /* initialize timers */ init_timer(&info->se_info.bwi_timer); info->se_info.bwi_timer.data = (unsigned long)info; info->se_info.bwi_timer.function = st21nfcb_se_wt_timeout; info->se_info.bwi_active = false; init_timer(&info->se_info.se_active_timer); info->se_info.se_active_timer.data = (unsigned long)info; info->se_info.se_active_timer.function = st21nfcb_se_activation_timeout; info->se_info.se_active = false; info->se_info.xch_error = false; info->se_info.wt_timeout = ST21NFCB_BWI_TO_TIMEOUT(ST21NFCB_ATR_DEFAULT_BWI); return 0; } EXPORT_SYMBOL(st21nfcb_se_init); void st21nfcb_se_deinit(struct nci_dev *ndev) { struct st21nfcb_nci_info *info = nci_get_drvdata(ndev); if (info->se_info.bwi_active) del_timer_sync(&info->se_info.bwi_timer); if (info->se_info.se_active) del_timer_sync(&info->se_info.se_active_timer); info->se_info.se_active = false; info->se_info.bwi_active = false; } EXPORT_SYMBOL(st21nfcb_se_deinit);