/* * HCI 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 #include #include #include #include #include #include #include "st21nfca.h" #include #define DRIVER_DESC "HCI NFC driver for ST21NFCA" #define FULL_VERSION_LEN 3 /* Proprietary gates, events, commands and registers */ /* Commands that apply to all RF readers */ #define ST21NFCA_RF_READER_CMD_PRESENCE_CHECK 0x30 #define ST21NFCA_RF_READER_ISO15693_GATE 0x12 /* * Reader gate for communication with contact-less cards using Type A * protocol ISO14443-3 but not compliant with ISO14443-4 */ #define ST21NFCA_RF_READER_14443_3_A_GATE 0x15 #define ST21NFCA_RF_READER_14443_3_A_UID 0x02 #define ST21NFCA_RF_READER_14443_3_A_ATQA 0x03 #define ST21NFCA_RF_READER_14443_3_A_SAK 0x04 #define ST21NFCA_DEVICE_MGNT_GATE 0x01 #define ST21NFCA_DEVICE_MGNT_PIPE 0x02 #define ST21NFCA_DM_GETINFO 0x13 #define ST21NFCA_DM_GETINFO_PIPE_LIST 0x02 #define ST21NFCA_DM_GETINFO_PIPE_INFO 0x01 #define ST21NFCA_DM_PIPE_CREATED 0x02 #define ST21NFCA_DM_PIPE_OPEN 0x04 #define ST21NFCA_DM_RF_ACTIVE 0x80 #define ST21NFCA_DM_IS_PIPE_OPEN(p) \ ((p & 0x0f) == (ST21NFCA_DM_PIPE_CREATED | ST21NFCA_DM_PIPE_OPEN)) #define ST21NFCA_NFC_MODE 0x03 /* NFC_MODE parameter*/ static DECLARE_BITMAP(dev_mask, ST21NFCA_NUM_DEVICES); static struct nfc_hci_gate st21nfca_gates[] = { {NFC_HCI_ADMIN_GATE, NFC_HCI_INVALID_PIPE}, {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE}, {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE}, {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_INVALID_PIPE}, {NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE}, {NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE}, {ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE}, {ST21NFCA_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE}, {ST21NFCA_RF_READER_14443_3_A_GATE, NFC_HCI_INVALID_PIPE}, }; struct st21nfca_pipe_info { u8 pipe_state; u8 src_host_id; u8 src_gate_id; u8 dst_host_id; u8 dst_gate_id; }; /* Largest headroom needed for outgoing custom commands */ #define ST21NFCA_CMDS_HEADROOM 7 static int st21nfca_hci_load_session(struct nfc_hci_dev *hdev) { int i, j, r; struct sk_buff *skb_pipe_list, *skb_pipe_info; struct st21nfca_pipe_info *info; u8 pipe_list[] = { ST21NFCA_DM_GETINFO_PIPE_LIST, NFC_HCI_TERMINAL_HOST_ID }; u8 pipe_info[] = { ST21NFCA_DM_GETINFO_PIPE_INFO, NFC_HCI_TERMINAL_HOST_ID, 0 }; skb_pipe_list = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE, GFP_KERNEL); if (!skb_pipe_list) { r = -ENOMEM; goto free_list; } skb_pipe_info = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE, GFP_KERNEL); if (!skb_pipe_info) { r = -ENOMEM; goto free_info; } /* On ST21NFCA device pipes number are dynamics * A maximum of 16 pipes can be created at the same time * 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 ST21NFCA is to: * - get a pipe list for each host. * (eg: NFC_HCI_HOST_CONTROLLER_ID for now). * (TODO Later on UICC HOST and eSE HOST) * - get pipe information * - match retrieved pipe list in st21nfca_gates * ST21NFCA_DEVICE_MGNT_GATE is a proprietary gate * with ST21NFCA_DEVICE_MGNT_PIPE. * Pipe can be closed and need to be open. */ r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_DEVICE_MGNT_PIPE); if (r < 0) goto free_info; /* Get pipe list */ r = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_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 = nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_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) */ info = (struct st21nfca_pipe_info *) skb_pipe_info->data; for (j = 0; (j < ARRAY_SIZE(st21nfca_gates)) && (st21nfca_gates[j].gate != info->dst_gate_id); j++) ; if (j < ARRAY_SIZE(st21nfca_gates) && st21nfca_gates[j].gate == info->dst_gate_id && ST21NFCA_DM_IS_PIPE_OPEN(info->pipe_state)) { st21nfca_gates[j].pipe = pipe_info[2]; hdev->gate2pipe[st21nfca_gates[j].gate] = st21nfca_gates[j].pipe; } } memcpy(hdev->init_data.gates, st21nfca_gates, sizeof(st21nfca_gates)); free_info: kfree_skb(skb_pipe_info); free_list: kfree_skb(skb_pipe_list); return r; } static int st21nfca_hci_open(struct nfc_hci_dev *hdev) { struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); int r; mutex_lock(&info->info_lock); if (info->state != ST21NFCA_ST_COLD) { r = -EBUSY; goto out; } r = info->phy_ops->enable(info->phy_id); if (r == 0) info->state = ST21NFCA_ST_READY; out: mutex_unlock(&info->info_lock); return r; } static void st21nfca_hci_close(struct nfc_hci_dev *hdev) { struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); mutex_lock(&info->info_lock); if (info->state == ST21NFCA_ST_COLD) goto out; info->phy_ops->disable(info->phy_id); info->state = ST21NFCA_ST_COLD; out: mutex_unlock(&info->info_lock); } static int st21nfca_hci_ready(struct nfc_hci_dev *hdev) { struct sk_buff *skb; u8 param; int r; param = NFC_HCI_UICC_HOST_ID; r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_WHITELIST, ¶m, 1); if (r < 0) return r; /* Set NFC_MODE in device management gate to enable */ r = nfc_hci_get_param(hdev, ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_NFC_MODE, &skb); if (r < 0) return r; if (skb->data[0] == 0) { kfree_skb(skb); param = 1; r = nfc_hci_set_param(hdev, ST21NFCA_DEVICE_MGNT_GATE, ST21NFCA_NFC_MODE, ¶m, 1); if (r < 0) return r; } r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_EVT_END_OPERATION, NULL, 0); if (r < 0) return r; r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, NFC_HCI_ID_MGMT_VERSION_SW, &skb); if (r < 0) return r; if (skb->len != FULL_VERSION_LEN) { kfree_skb(skb); return -EINVAL; } print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ", DUMP_PREFIX_NONE, 16, 1, skb->data, FULL_VERSION_LEN, false); kfree_skb(skb); return 0; } static int st21nfca_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb) { struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); return info->phy_ops->write(info->phy_id, skb); } static int st21nfca_hci_start_poll(struct nfc_hci_dev *hdev, u32 im_protocols, u32 tm_protocols) { int r; pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n", __func__, im_protocols, tm_protocols); r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_EVT_END_OPERATION, NULL, 0); if (r < 0) return r; if (im_protocols) { /* * enable polling according to im_protocols & tm_protocols * - CLOSE pipe according to im_protocols & tm_protocols */ if ((NFC_HCI_RF_READER_B_GATE & im_protocols) == 0) { r = nfc_hci_disconnect_gate(hdev, NFC_HCI_RF_READER_B_GATE); if (r < 0) return r; } if ((NFC_HCI_RF_READER_A_GATE & im_protocols) == 0) { r = nfc_hci_disconnect_gate(hdev, NFC_HCI_RF_READER_A_GATE); if (r < 0) return r; } if ((ST21NFCA_RF_READER_F_GATE & im_protocols) == 0) { r = nfc_hci_disconnect_gate(hdev, ST21NFCA_RF_READER_F_GATE); if (r < 0) return r; } if ((ST21NFCA_RF_READER_14443_3_A_GATE & im_protocols) == 0) { r = nfc_hci_disconnect_gate(hdev, ST21NFCA_RF_READER_14443_3_A_GATE); if (r < 0) return r; } if ((ST21NFCA_RF_READER_ISO15693_GATE & im_protocols) == 0) { r = nfc_hci_disconnect_gate(hdev, ST21NFCA_RF_READER_ISO15693_GATE); if (r < 0) return r; } r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_EVT_READER_REQUESTED, NULL, 0); if (r < 0) nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_EVT_END_OPERATION, NULL, 0); } return r; } static int st21nfca_get_iso14443_3_atqa(struct nfc_hci_dev *hdev, u16 *atqa) { int r; struct sk_buff *atqa_skb = NULL; r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE, ST21NFCA_RF_READER_14443_3_A_ATQA, &atqa_skb); if (r < 0) goto exit; if (atqa_skb->len != 2) { r = -EPROTO; goto exit; } *atqa = be16_to_cpu(*(__be16 *) atqa_skb->data); exit: kfree_skb(atqa_skb); return r; } static int st21nfca_get_iso14443_3_sak(struct nfc_hci_dev *hdev, u8 *sak) { int r; struct sk_buff *sak_skb = NULL; r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE, ST21NFCA_RF_READER_14443_3_A_SAK, &sak_skb); if (r < 0) goto exit; if (sak_skb->len != 1) { r = -EPROTO; goto exit; } *sak = sak_skb->data[0]; exit: kfree_skb(sak_skb); return r; } static int st21nfca_get_iso14443_3_uid(struct nfc_hci_dev *hdev, u8 *gate, int *len) { int r; struct sk_buff *uid_skb = NULL; r = nfc_hci_get_param(hdev, ST21NFCA_RF_READER_14443_3_A_GATE, ST21NFCA_RF_READER_14443_3_A_UID, &uid_skb); if (r < 0) goto exit; if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) { r = -EPROTO; goto exit; } gate = uid_skb->data; *len = uid_skb->len; exit: kfree_skb(uid_skb); return r; } static int st21nfca_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate, struct nfc_target *target) { int r, len; u16 atqa; u8 sak; u8 uid[NFC_NFCID1_MAXSIZE]; switch (gate) { case ST21NFCA_RF_READER_F_GATE: target->supported_protocols = NFC_PROTO_FELICA_MASK; break; case ST21NFCA_RF_READER_14443_3_A_GATE: /* ISO14443-3 type 1 or 2 tags */ r = st21nfca_get_iso14443_3_atqa(hdev, &atqa); if (r < 0) return r; if (atqa == 0x000c) { target->supported_protocols = NFC_PROTO_JEWEL_MASK; target->sens_res = 0x0c00; } else { r = st21nfca_get_iso14443_3_sak(hdev, &sak); if (r < 0) return r; r = st21nfca_get_iso14443_3_uid(hdev, uid, &len); if (r < 0) return r; target->supported_protocols = nfc_hci_sak_to_protocol(sak); if (target->supported_protocols == 0xffffffff) return -EPROTO; target->sens_res = atqa; target->sel_res = sak; memcpy(target->nfcid1, uid, len); target->nfcid1_len = len; } break; default: return -EPROTO; } return 0; } /* * Returns: * <= 0: driver handled the data exchange * 1: driver doesn't especially handle, please do standard processing */ static int st21nfca_hci_im_transceive(struct nfc_hci_dev *hdev, struct nfc_target *target, struct sk_buff *skb, data_exchange_cb_t cb, void *cb_context) { pr_info(DRIVER_DESC ": %s for gate=%d len=%d\n", __func__, target->hci_reader_gate, skb->len); switch (target->hci_reader_gate) { case ST21NFCA_RF_READER_F_GATE: *skb_push(skb, 1) = 0x1a; return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, ST21NFCA_WR_XCHG_DATA, skb->data, skb->len, cb, cb_context); case ST21NFCA_RF_READER_14443_3_A_GATE: *skb_push(skb, 1) = 0x1a; /* CTR, see spec:10.2.2.1 */ return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, ST21NFCA_WR_XCHG_DATA, skb->data, skb->len, cb, cb_context); default: return 1; } } static int st21nfca_hci_check_presence(struct nfc_hci_dev *hdev, struct nfc_target *target) { u8 fwi = 0x11; switch (target->hci_reader_gate) { case NFC_HCI_RF_READER_A_GATE: case NFC_HCI_RF_READER_B_GATE: /* * PRESENCE_CHECK on those gates is available * However, the answer to this command is taking 3 * fwi * if the card is no present. * Instead, we send an empty I-Frame with a very short * configurable fwi ~604µs. */ return nfc_hci_send_cmd(hdev, target->hci_reader_gate, ST21NFCA_WR_XCHG_DATA, &fwi, 1, NULL); case ST21NFCA_RF_READER_14443_3_A_GATE: return nfc_hci_send_cmd(hdev, target->hci_reader_gate, ST21NFCA_RF_READER_CMD_PRESENCE_CHECK, NULL, 0, NULL); default: return -EOPNOTSUPP; } } static struct nfc_hci_ops st21nfca_hci_ops = { .open = st21nfca_hci_open, .close = st21nfca_hci_close, .load_session = st21nfca_hci_load_session, .hci_ready = st21nfca_hci_ready, .xmit = st21nfca_hci_xmit, .start_poll = st21nfca_hci_start_poll, .target_from_gate = st21nfca_hci_target_from_gate, .im_transceive = st21nfca_hci_im_transceive, .check_presence = st21nfca_hci_check_presence, }; int st21nfca_hci_probe(void *phy_id, struct nfc_phy_ops *phy_ops, char *llc_name, int phy_headroom, int phy_tailroom, int phy_payload, struct nfc_hci_dev **hdev) { struct st21nfca_hci_info *info; int r = 0; int dev_num; u32 protocols; struct nfc_hci_init_data init_data; unsigned long quirks = 0; info = kzalloc(sizeof(struct st21nfca_hci_info), GFP_KERNEL); if (!info) { r = -ENOMEM; goto err_alloc_hdev; } info->phy_ops = phy_ops; info->phy_id = phy_id; info->state = ST21NFCA_ST_COLD; mutex_init(&info->info_lock); init_data.gate_count = ARRAY_SIZE(st21nfca_gates); memcpy(init_data.gates, st21nfca_gates, sizeof(st21nfca_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, ST21NFCA_NUM_DEVICES); if (dev_num >= ST21NFCA_NUM_DEVICES) goto err_alloc_hdev; scnprintf(init_data.session_id, sizeof(init_data.session_id), "%s%2x", "ST21AH", dev_num); protocols = NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK | NFC_PROTO_ISO14443_B_MASK; set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks); info->hdev = nfc_hci_allocate_device(&st21nfca_hci_ops, &init_data, quirks, protocols, llc_name, phy_headroom + ST21NFCA_CMDS_HEADROOM, phy_tailroom, phy_payload); if (!info->hdev) { pr_err("Cannot allocate nfc hdev.\n"); r = -ENOMEM; goto err_alloc_hdev; } nfc_hci_set_clientdata(info->hdev, info); r = nfc_hci_register_device(info->hdev); if (r) goto err_regdev; *hdev = info->hdev; return 0; err_regdev: nfc_hci_free_device(info->hdev); err_alloc_hdev: kfree(info); return r; } EXPORT_SYMBOL(st21nfca_hci_probe); void st21nfca_hci_remove(struct nfc_hci_dev *hdev) { struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev); nfc_hci_unregister_device(hdev); nfc_hci_free_device(hdev); kfree(info); } EXPORT_SYMBOL(st21nfca_hci_remove); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION(DRIVER_DESC);