2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
26 #include <net/nfc/hci.h>
31 * Payload is the HCP message data only. Instruction will be prepended.
32 * Guarantees that cb will be called upon completion or timeout delay
33 * counted from the moment the cmd is sent to the transport.
35 int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
36 u8 type, u8 instruction,
37 const u8 *payload, size_t payload_len,
38 hci_cmd_cb_t cb, void *cb_data,
39 unsigned long completion_delay)
41 struct nfc_dev *ndev = hdev->ndev;
43 const u8 *ptr = payload;
45 bool firstfrag = true;
47 cmd = kzalloc(sizeof(struct hci_msg), GFP_KERNEL);
51 INIT_LIST_HEAD(&cmd->msg_l);
52 skb_queue_head_init(&cmd->msg_frags);
53 cmd->wait_response = (type == NFC_HCI_HCP_COMMAND) ? true : false;
55 cmd->cb_context = cb_data;
56 cmd->completion_delay = completion_delay;
58 hci_len = payload_len + 1;
61 int skb_len, data_link_len;
62 struct hcp_packet *packet;
64 if (NFC_HCI_HCP_PACKET_HEADER_LEN + hci_len <=
65 hdev->max_data_link_payload)
66 data_link_len = hci_len;
68 data_link_len = hdev->max_data_link_payload -
69 NFC_HCI_HCP_PACKET_HEADER_LEN;
71 skb_len = ndev->tx_headroom + NFC_HCI_HCP_PACKET_HEADER_LEN +
72 data_link_len + ndev->tx_tailroom;
73 hci_len -= data_link_len;
75 skb = alloc_skb(skb_len, GFP_KERNEL);
80 skb_reserve(skb, ndev->tx_headroom);
82 skb_put(skb, NFC_HCI_HCP_PACKET_HEADER_LEN + data_link_len);
84 /* Only the last fragment will have the cb bit set to 1 */
85 packet = (struct hcp_packet *)skb->data;
86 packet->header = pipe;
89 packet->message.header = HCP_HEADER(type, instruction);
91 memcpy(packet->message.data, ptr,
93 ptr += data_link_len - 1;
96 memcpy(&packet->message, ptr, data_link_len);
100 /* This is the last fragment, set the cb bit */
102 packet->header |= ~NFC_HCI_FRAGMENT;
104 skb_queue_tail(&cmd->msg_frags, skb);
107 mutex_lock(&hdev->msg_tx_mutex);
108 list_add_tail(&hdev->msg_tx_queue, &cmd->msg_l);
109 mutex_unlock(&hdev->msg_tx_mutex);
111 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
116 skb_queue_purge(&cmd->msg_frags);
122 u8 nfc_hci_pipe2gate(struct nfc_hci_dev *hdev, u8 pipe)
126 for (gate = 0; gate < NFC_HCI_MAX_GATES; gate++)
127 if (hdev->gate2pipe[gate] == pipe)
134 * Receive hcp message for pipe, with type and cmd.
135 * skb contains optional message data only.
137 void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
138 u8 instruction, struct sk_buff *skb)
141 case NFC_HCI_HCP_RESPONSE:
142 nfc_hci_resp_received(hdev, instruction, skb);
144 case NFC_HCI_HCP_COMMAND:
145 nfc_hci_cmd_received(hdev, pipe, instruction, skb);
147 case NFC_HCI_HCP_EVENT:
148 nfc_hci_event_received(hdev, pipe, instruction, skb);
151 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",