// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*/
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#define pr_fmt(fmt) "hci: %s: " fmt, __func__
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <net/nfc/hci.h>
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#include "hci.h"
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/*
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* Payload is the HCP message data only. Instruction will be prepended.
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* Guarantees that cb will be called upon completion or timeout delay
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* counted from the moment the cmd is sent to the transport.
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*/
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int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
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u8 type, u8 instruction,
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const u8 *payload, size_t payload_len,
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data_exchange_cb_t cb, void *cb_context,
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unsigned long completion_delay)
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{
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struct nfc_dev *ndev = hdev->ndev;
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struct hci_msg *cmd;
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const u8 *ptr = payload;
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int hci_len, err;
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bool firstfrag = true;
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cmd = kzalloc(sizeof(struct hci_msg), GFP_KERNEL);
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if (cmd == NULL)
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return -ENOMEM;
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INIT_LIST_HEAD(&cmd->msg_l);
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skb_queue_head_init(&cmd->msg_frags);
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cmd->wait_response = (type == NFC_HCI_HCP_COMMAND) ? true : false;
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cmd->cb = cb;
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cmd->cb_context = cb_context;
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cmd->completion_delay = completion_delay;
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hci_len = payload_len + 1;
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while (hci_len > 0) {
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struct sk_buff *skb;
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int skb_len, data_link_len;
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struct hcp_packet *packet;
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if (NFC_HCI_HCP_PACKET_HEADER_LEN + hci_len <=
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hdev->max_data_link_payload)
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data_link_len = hci_len;
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else
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data_link_len = hdev->max_data_link_payload -
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NFC_HCI_HCP_PACKET_HEADER_LEN;
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skb_len = ndev->tx_headroom + NFC_HCI_HCP_PACKET_HEADER_LEN +
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data_link_len + ndev->tx_tailroom;
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hci_len -= data_link_len;
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skb = alloc_skb(skb_len, GFP_KERNEL);
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if (skb == NULL) {
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err = -ENOMEM;
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goto out_skb_err;
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}
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skb_reserve(skb, ndev->tx_headroom);
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skb_put(skb, NFC_HCI_HCP_PACKET_HEADER_LEN + data_link_len);
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/* Only the last fragment will have the cb bit set to 1 */
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packet = (struct hcp_packet *)skb->data;
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packet->header = pipe;
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if (firstfrag) {
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firstfrag = false;
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packet->message.header = HCP_HEADER(type, instruction);
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if (ptr) {
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memcpy(packet->message.data, ptr,
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data_link_len - 1);
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ptr += data_link_len - 1;
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}
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} else {
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memcpy(&packet->message, ptr, data_link_len);
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ptr += data_link_len;
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}
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/* This is the last fragment, set the cb bit */
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if (hci_len == 0)
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packet->header |= ~NFC_HCI_FRAGMENT;
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skb_queue_tail(&cmd->msg_frags, skb);
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}
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mutex_lock(&hdev->msg_tx_mutex);
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if (hdev->shutting_down) {
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err = -ESHUTDOWN;
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mutex_unlock(&hdev->msg_tx_mutex);
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goto out_skb_err;
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}
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list_add_tail(&cmd->msg_l, &hdev->msg_tx_queue);
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mutex_unlock(&hdev->msg_tx_mutex);
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schedule_work(&hdev->msg_tx_work);
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return 0;
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out_skb_err:
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skb_queue_purge(&cmd->msg_frags);
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kfree(cmd);
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return err;
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}
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/*
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* Receive hcp message for pipe, with type and cmd.
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* skb contains optional message data only.
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*/
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void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
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u8 instruction, struct sk_buff *skb)
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{
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switch (type) {
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case NFC_HCI_HCP_RESPONSE:
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nfc_hci_resp_received(hdev, instruction, skb);
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break;
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case NFC_HCI_HCP_COMMAND:
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nfc_hci_cmd_received(hdev, pipe, instruction, skb);
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break;
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case NFC_HCI_HCP_EVENT:
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nfc_hci_event_received(hdev, pipe, instruction, skb);
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break;
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default:
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pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
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type, instruction);
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kfree_skb(skb);
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break;
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}
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}
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