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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Bluetooth HCI UART driver
*
* Copyright (C) 2000-2001 Qualcomm Incorporated
* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/signal.h>
#include <linux/ioctl.h>
#include <linux/skbuff.h>
#include <linux/unaligned.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/hci_h4.h>
#include "hci_uart.h"
struct h4_struct {
struct sk_buff *rx_skb;
struct sk_buff_head txq;
};
/* Initialize protocol */
static int h4_open(struct hci_uart *hu)
{
struct h4_struct *h4;
BT_DBG("hu %p", hu);
h4 = kzalloc_obj(*h4);
if (!h4)
return -ENOMEM;
skb_queue_head_init(&h4->txq);
hu->priv = h4;
return 0;
}
/* Flush protocol data */
static int h4_flush(struct hci_uart *hu)
{
struct h4_struct *h4 = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&h4->txq);
return 0;
}
/* Close protocol */
static int h4_close(struct hci_uart *hu)
{
struct h4_struct *h4 = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&h4->txq);
kfree_skb(h4->rx_skb);
hu->priv = NULL;
kfree(h4);
return 0;
}
/* Enqueue frame for transmission (padding, crc, etc) */
static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct h4_struct *h4 = hu->priv;
BT_DBG("hu %p skb %p", hu, skb);
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
skb_queue_tail(&h4->txq, skb);
return 0;
}
static const struct h4_recv_pkt h4_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = hci_recv_frame },
{ H4_RECV_ISO, .recv = hci_recv_frame },
};
/* Recv data */
static int h4_recv(struct hci_uart *hu, const void *data, int count)
{
struct h4_struct *h4 = hu->priv;
if (!h4)
return -ENODEV;
h4->rx_skb = h4_recv_skb(hu->hdev, &hu->alignment, &hu->padding,
h4->rx_skb, data, count, h4_recv_pkts,
ARRAY_SIZE(h4_recv_pkts));
if (IS_ERR(h4->rx_skb)) {
int err = PTR_ERR(h4->rx_skb);
bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
h4->rx_skb = NULL;
return err;
}
return count;
}
static struct sk_buff *h4_dequeue(struct hci_uart *hu)
{
struct h4_struct *h4 = hu->priv;
return skb_dequeue(&h4->txq);
}
static const struct hci_uart_proto h4p = {
.id = HCI_UART_H4,
.name = "H4",
.open = h4_open,
.close = h4_close,
.recv = h4_recv,
.enqueue = h4_enqueue,
.dequeue = h4_dequeue,
.flush = h4_flush,
};
int __init h4_init(void)
{
return hci_uart_register_proto(&h4p);
}
int __exit h4_deinit(void)
{
return hci_uart_unregister_proto(&h4p);
}
struct sk_buff *h4_recv_buf(struct hci_uart *hu, struct sk_buff *skb,
const unsigned char *buffer, int count,
const struct h4_recv_pkt *pkts, int pkts_count)
{
return h4_recv_skb(hu->hdev, &hu->alignment, &hu->padding, skb, buffer,
count, pkts, pkts_count);
}
EXPORT_SYMBOL_GPL(h4_recv_buf);
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