/* * Copyright (C) 2012 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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, write to the * Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #define pr_fmt(fmt) "hci: %s: " fmt, __func__ #include #include #include #include #include #include #include "hci.h" /* Largest headroom needed for outgoing HCI commands */ #define HCI_CMDS_HEADROOM 1 static int nfc_hci_result_to_errno(u8 result) { switch (result) { case NFC_HCI_ANY_OK: return 0; case NFC_HCI_ANY_E_TIMEOUT: return -ETIME; default: return -1; } } static void nfc_hci_msg_tx_work(struct work_struct *work) { struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, msg_tx_work); struct hci_msg *msg; struct sk_buff *skb; int r = 0; mutex_lock(&hdev->msg_tx_mutex); if (hdev->cmd_pending_msg) { if (timer_pending(&hdev->cmd_timer) == 0) { if (hdev->cmd_pending_msg->cb) hdev->cmd_pending_msg->cb(hdev, -ETIME, NULL, hdev-> cmd_pending_msg-> cb_context); kfree(hdev->cmd_pending_msg); hdev->cmd_pending_msg = NULL; } else goto exit; } next_msg: if (list_empty(&hdev->msg_tx_queue)) goto exit; msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l); list_del(&msg->msg_l); pr_debug("msg_tx_queue has a cmd to send\n"); while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) { r = hdev->ops->xmit(hdev, skb); if (r < 0) { kfree_skb(skb); skb_queue_purge(&msg->msg_frags); if (msg->cb) msg->cb(hdev, r, NULL, msg->cb_context); kfree(msg); break; } } if (r) goto next_msg; if (msg->wait_response == false) { kfree(msg); goto next_msg; } hdev->cmd_pending_msg = msg; mod_timer(&hdev->cmd_timer, jiffies + msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay)); exit: mutex_unlock(&hdev->msg_tx_mutex); } static void nfc_hci_msg_rx_work(struct work_struct *work) { struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, msg_rx_work); struct sk_buff *skb; struct hcp_message *message; u8 pipe; u8 type; u8 instruction; while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) { pipe = skb->data[0]; skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN); message = (struct hcp_message *)skb->data; type = HCP_MSG_GET_TYPE(message->header); instruction = HCP_MSG_GET_CMD(message->header); skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN); nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb); } } void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result, struct sk_buff *skb) { mutex_lock(&hdev->msg_tx_mutex); if (hdev->cmd_pending_msg == NULL) { kfree_skb(skb); goto exit; } del_timer_sync(&hdev->cmd_timer); if (hdev->cmd_pending_msg->cb) hdev->cmd_pending_msg->cb(hdev, nfc_hci_result_to_errno(result), skb, hdev->cmd_pending_msg->cb_context); else kfree_skb(skb); kfree(hdev->cmd_pending_msg); hdev->cmd_pending_msg = NULL; queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work); exit: mutex_unlock(&hdev->msg_tx_mutex); } void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, struct sk_buff *skb) { kfree_skb(skb); } static u32 nfc_hci_sak_to_protocol(u8 sak) { switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) { case NFC_HCI_TYPE_A_SEL_PROT_MIFARE: return NFC_PROTO_MIFARE_MASK; case NFC_HCI_TYPE_A_SEL_PROT_ISO14443: return NFC_PROTO_ISO14443_MASK; case NFC_HCI_TYPE_A_SEL_PROT_DEP: return NFC_PROTO_NFC_DEP_MASK; case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP: return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; default: return 0xffffffff; } } static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate) { struct nfc_target *targets; struct sk_buff *atqa_skb = NULL; struct sk_buff *sak_skb = NULL; int r; pr_debug("from gate %d\n", gate); targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); if (targets == NULL) return -ENOMEM; switch (gate) { case NFC_HCI_RF_READER_A_GATE: r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_RF_READER_A_ATQA, &atqa_skb); if (r < 0) goto exit; r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_RF_READER_A_SAK, &sak_skb); if (r < 0) goto exit; if (atqa_skb->len != 2 || sak_skb->len != 1) { r = -EPROTO; goto exit; } targets->supported_protocols = nfc_hci_sak_to_protocol(sak_skb->data[0]); if (targets->supported_protocols == 0xffffffff) { r = -EPROTO; goto exit; } targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data); targets->sel_res = sak_skb->data[0]; if (hdev->ops->complete_target_discovered) { r = hdev->ops->complete_target_discovered(hdev, gate, targets); if (r < 0) goto exit; } break; case NFC_HCI_RF_READER_B_GATE: targets->supported_protocols = NFC_PROTO_ISO14443_MASK; break; default: if (hdev->ops->target_from_gate) r = hdev->ops->target_from_gate(hdev, gate, targets); else r = -EPROTO; if (r < 0) goto exit; if (hdev->ops->complete_target_discovered) { r = hdev->ops->complete_target_discovered(hdev, gate, targets); if (r < 0) goto exit; } break; } targets->hci_reader_gate = gate; r = nfc_targets_found(hdev->ndev, targets, 1); exit: kfree(targets); kfree_skb(atqa_skb); kfree_skb(sak_skb); return r; } void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event, struct sk_buff *skb) { int r = 0; switch (event) { case NFC_HCI_EVT_TARGET_DISCOVERED: if (skb->len < 1) { /* no status data? */ r = -EPROTO; goto exit; } if (skb->data[0] == 3) { /* TODO: Multiple targets in field, none activated * poll is supposedly stopped, but there is no * single target to activate, so nothing to report * up. * if we need to restart poll, we must save the * protocols from the initial poll and reuse here. */ } if (skb->data[0] != 0) { r = -EPROTO; goto exit; } r = nfc_hci_target_discovered(hdev, nfc_hci_pipe2gate(hdev, pipe)); break; default: /* TODO: Unknown events are hardware specific * pass them to the driver (needs a new hci_ops) */ break; } exit: kfree_skb(skb); if (r) { /* TODO: There was an error dispatching the event, * how to propagate up to nfc core? */ } } static void nfc_hci_cmd_timeout(unsigned long data) { struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data; queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work); } static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count, u8 gates[]) { int r; u8 *p = gates; while (gate_count--) { r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, *p); if (r < 0) return r; p++; } return 0; } static int hci_dev_session_init(struct nfc_hci_dev *hdev) { struct sk_buff *skb = NULL; int r; u8 hci_gates[] = { /* NFC_HCI_ADMIN_GATE MUST be first */ NFC_HCI_ADMIN_GATE, NFC_HCI_LOOPBACK_GATE, NFC_HCI_ID_MGMT_GATE, NFC_HCI_LINK_MGMT_GATE, NFC_HCI_RF_READER_B_GATE, NFC_HCI_RF_READER_A_GATE }; r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, NFC_HCI_ADMIN_GATE); if (r < 0) goto exit; r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_SESSION_IDENTITY, &skb); if (r < 0) goto disconnect_all; if (skb->len && skb->len == strlen(hdev->init_data.session_id)) if (memcmp(hdev->init_data.session_id, skb->data, skb->len) == 0) { /* TODO ELa: restore gate<->pipe table from * some TBD location. * note: it doesn't seem possible to get the chip * currently open gate/pipe table. * It is only possible to obtain the supported * gate list. */ /* goto exit * For now, always do a full initialization */ } r = nfc_hci_disconnect_all_gates(hdev); if (r < 0) goto exit; r = hci_dev_connect_gates(hdev, sizeof(hci_gates), hci_gates); if (r < 0) goto disconnect_all; r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count, hdev->init_data.gates); if (r < 0) goto disconnect_all; r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, NFC_HCI_ADMIN_SESSION_IDENTITY, hdev->init_data.session_id, strlen(hdev->init_data.session_id)); if (r == 0) goto exit; disconnect_all: nfc_hci_disconnect_all_gates(hdev); exit: if (skb) kfree_skb(skb); return r; } static int hci_dev_version(struct nfc_hci_dev *hdev) { int r; struct sk_buff *skb; 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 != 3) { kfree_skb(skb); return -EINVAL; } hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; hdev->sw_patch = skb->data[0] & 0x0f; hdev->sw_flashlib_major = skb->data[1]; hdev->sw_flashlib_minor = skb->data[2]; kfree_skb(skb); r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, NFC_HCI_ID_MGMT_VERSION_HW, &skb); if (r < 0) return r; if (skb->len != 3) { kfree_skb(skb); return -EINVAL; } hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; hdev->hw_version = skb->data[0] & 0x1f; hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; hdev->hw_software = skb->data[1] & 0x3f; hdev->hw_bsid = skb->data[2]; kfree_skb(skb); pr_info("SOFTWARE INFO:\n"); pr_info("RomLib : %d\n", hdev->sw_romlib); pr_info("Patch : %d\n", hdev->sw_patch); pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); pr_info("HARDWARE INFO:\n"); pr_info("Derivative : %d\n", hdev->hw_derivative); pr_info("HW Version : %d\n", hdev->hw_version); pr_info("#MPW : %d\n", hdev->hw_mpw); pr_info("Software : %d\n", hdev->hw_software); pr_info("BSID Version : %d\n", hdev->hw_bsid); return 0; } static int hci_dev_up(struct nfc_dev *nfc_dev) { struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); int r = 0; if (hdev->ops->open) { r = hdev->ops->open(hdev); if (r < 0) return r; } r = hci_dev_session_init(hdev); if (r < 0) goto exit; r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_EVT_END_OPERATION, NULL, 0); if (r < 0) goto exit; if (hdev->ops->hci_ready) { r = hdev->ops->hci_ready(hdev); if (r < 0) goto exit; } r = hci_dev_version(hdev); if (r < 0) goto exit; exit: if (r < 0) if (hdev->ops->close) hdev->ops->close(hdev); return r; } static int hci_dev_down(struct nfc_dev *nfc_dev) { struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); if (hdev->ops->close) hdev->ops->close(hdev); memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); return 0; } static int hci_start_poll(struct nfc_dev *nfc_dev, u32 im_protocols, u32 tm_protocols) { struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); if (hdev->ops->start_poll) return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); else return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_EVT_READER_REQUESTED, NULL, 0); } static void hci_stop_poll(struct nfc_dev *nfc_dev) { struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, NFC_HCI_EVT_END_OPERATION, NULL, 0); } static int hci_activate_target(struct nfc_dev *nfc_dev, struct nfc_target *target, u32 protocol) { return 0; } static void hci_deactivate_target(struct nfc_dev *nfc_dev, struct nfc_target *target) { } static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, struct sk_buff *skb, data_exchange_cb_t cb, void *cb_context) { struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); int r; struct sk_buff *res_skb = NULL; pr_debug("target_idx=%d\n", target->idx); switch (target->hci_reader_gate) { case NFC_HCI_RF_READER_A_GATE: case NFC_HCI_RF_READER_B_GATE: if (hdev->ops->data_exchange) { r = hdev->ops->data_exchange(hdev, target, skb, &res_skb); if (r <= 0) /* handled */ break; } *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ r = nfc_hci_send_cmd(hdev, target->hci_reader_gate, NFC_HCI_WR_XCHG_DATA, skb->data, skb->len, &res_skb); /* * TODO: Check RF Error indicator to make sure data is valid. * It seems that HCI cmd can complete without error, but data * can be invalid if an RF error occured? Ignore for now. */ if (r == 0) skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */ break; default: if (hdev->ops->data_exchange) { r = hdev->ops->data_exchange(hdev, target, skb, &res_skb); if (r == 1) r = -ENOTSUPP; } else r = -ENOTSUPP; } kfree_skb(skb); cb(cb_context, res_skb, r); return 0; } static int hci_check_presence(struct nfc_dev *nfc_dev, struct nfc_target *target) { struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); if (hdev->ops->check_presence) return hdev->ops->check_presence(hdev, target); return 0; } static struct nfc_ops hci_nfc_ops = { .dev_up = hci_dev_up, .dev_down = hci_dev_down, .start_poll = hci_start_poll, .stop_poll = hci_stop_poll, .activate_target = hci_activate_target, .deactivate_target = hci_deactivate_target, .im_transceive = hci_transceive, .check_presence = hci_check_presence, }; struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops, struct nfc_hci_init_data *init_data, u32 protocols, int tx_headroom, int tx_tailroom, int max_link_payload) { struct nfc_hci_dev *hdev; if (ops->xmit == NULL) return NULL; if (protocols == 0) return NULL; hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); if (hdev == NULL) return NULL; hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, tx_headroom + HCI_CMDS_HEADROOM, tx_tailroom); if (!hdev->ndev) { kfree(hdev); return NULL; } hdev->ops = ops; hdev->max_data_link_payload = max_link_payload; hdev->init_data = *init_data; nfc_set_drvdata(hdev->ndev, hdev); memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); return hdev; } EXPORT_SYMBOL(nfc_hci_allocate_device); void nfc_hci_free_device(struct nfc_hci_dev *hdev) { nfc_free_device(hdev->ndev); kfree(hdev); } EXPORT_SYMBOL(nfc_hci_free_device); int nfc_hci_register_device(struct nfc_hci_dev *hdev) { struct device *dev = &hdev->ndev->dev; const char *devname = dev_name(dev); char name[32]; int r = 0; mutex_init(&hdev->msg_tx_mutex); INIT_LIST_HEAD(&hdev->msg_tx_queue); INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname); hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); if (hdev->msg_tx_wq == NULL) { r = -ENOMEM; goto exit; } init_timer(&hdev->cmd_timer); hdev->cmd_timer.data = (unsigned long)hdev; hdev->cmd_timer.function = nfc_hci_cmd_timeout; skb_queue_head_init(&hdev->rx_hcp_frags); INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname); hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); if (hdev->msg_rx_wq == NULL) { r = -ENOMEM; goto exit; } skb_queue_head_init(&hdev->msg_rx_queue); r = nfc_register_device(hdev->ndev); exit: if (r < 0) { if (hdev->msg_tx_wq) destroy_workqueue(hdev->msg_tx_wq); if (hdev->msg_rx_wq) destroy_workqueue(hdev->msg_rx_wq); } return r; } EXPORT_SYMBOL(nfc_hci_register_device); void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) { struct hci_msg *msg; skb_queue_purge(&hdev->rx_hcp_frags); skb_queue_purge(&hdev->msg_rx_queue); while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l)) != NULL) { list_del(&msg->msg_l); skb_queue_purge(&msg->msg_frags); kfree(msg); } del_timer_sync(&hdev->cmd_timer); nfc_unregister_device(hdev->ndev); destroy_workqueue(hdev->msg_tx_wq); destroy_workqueue(hdev->msg_rx_wq); } EXPORT_SYMBOL(nfc_hci_unregister_device); void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) { hdev->clientdata = clientdata; } EXPORT_SYMBOL(nfc_hci_set_clientdata); void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) { return hdev->clientdata; } EXPORT_SYMBOL(nfc_hci_get_clientdata); static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) { /* * TODO: lower layer has permanent failure. * complete potential HCI command or send an empty tag discovered event */ } void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) { nfc_hci_failure(hdev, err); } EXPORT_SYMBOL(nfc_hci_driver_failure); void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) { struct hcp_packet *packet; u8 type; u8 instruction; struct sk_buff *hcp_skb; u8 pipe; struct sk_buff *frag_skb; int msg_len; packet = (struct hcp_packet *)skb->data; if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { skb_queue_tail(&hdev->rx_hcp_frags, skb); return; } /* it's the last fragment. Does it need re-aggregation? */ if (skb_queue_len(&hdev->rx_hcp_frags)) { pipe = packet->header & NFC_HCI_FRAGMENT; skb_queue_tail(&hdev->rx_hcp_frags, skb); msg_len = 0; skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { msg_len += (frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN); } hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + msg_len, GFP_KERNEL); if (hcp_skb == NULL) { nfc_hci_failure(hdev, -ENOMEM); return; } *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe; skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; memcpy(skb_put(hcp_skb, msg_len), frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, msg_len); } skb_queue_purge(&hdev->rx_hcp_frags); } else { packet->header &= NFC_HCI_FRAGMENT; hcp_skb = skb; } /* if this is a response, dispatch immediately to * unblock waiting cmd context. Otherwise, enqueue to dispatch * in separate context where handler can also execute command. */ packet = (struct hcp_packet *)hcp_skb->data; type = HCP_MSG_GET_TYPE(packet->message.header); if (type == NFC_HCI_HCP_RESPONSE) { pipe = packet->header; instruction = HCP_MSG_GET_CMD(packet->message.header); skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + NFC_HCI_HCP_MESSAGE_HEADER_LEN); nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); } else { skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work); } } EXPORT_SYMBOL(nfc_hci_recv_frame); MODULE_LICENSE("GPL");