5f60d5f6bb
asm/unaligned.h is always an include of asm-generic/unaligned.h; might as well move that thing to linux/unaligned.h and include that - there's nothing arch-specific in that header. auto-generated by the following: for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $i done for i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $i done git mv include/asm-generic/unaligned.h include/linux/unaligned.h git mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.h sed -i -e "/unaligned.h/d" include/asm-generic/Kbuild sed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h
275 lines
5.4 KiB
C
275 lines
5.4 KiB
C
// 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 "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(sizeof(*h4), GFP_KERNEL);
|
|
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 (!test_bit(HCI_UART_REGISTERED, &hu->flags))
|
|
return -EUNATCH;
|
|
|
|
h4->rx_skb = h4_recv_buf(hu->hdev, 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_dev *hdev, struct sk_buff *skb,
|
|
const unsigned char *buffer, int count,
|
|
const struct h4_recv_pkt *pkts, int pkts_count)
|
|
{
|
|
struct hci_uart *hu = hci_get_drvdata(hdev);
|
|
u8 alignment = hu->alignment ? hu->alignment : 1;
|
|
|
|
/* Check for error from previous call */
|
|
if (IS_ERR(skb))
|
|
skb = NULL;
|
|
|
|
while (count) {
|
|
int i, len;
|
|
|
|
/* remove padding bytes from buffer */
|
|
for (; hu->padding && count > 0; hu->padding--) {
|
|
count--;
|
|
buffer++;
|
|
}
|
|
if (!count)
|
|
break;
|
|
|
|
if (!skb) {
|
|
for (i = 0; i < pkts_count; i++) {
|
|
if (buffer[0] != (&pkts[i])->type)
|
|
continue;
|
|
|
|
skb = bt_skb_alloc((&pkts[i])->maxlen,
|
|
GFP_ATOMIC);
|
|
if (!skb)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
hci_skb_pkt_type(skb) = (&pkts[i])->type;
|
|
hci_skb_expect(skb) = (&pkts[i])->hlen;
|
|
break;
|
|
}
|
|
|
|
/* Check for invalid packet type */
|
|
if (!skb)
|
|
return ERR_PTR(-EILSEQ);
|
|
|
|
count -= 1;
|
|
buffer += 1;
|
|
}
|
|
|
|
len = min_t(uint, hci_skb_expect(skb) - skb->len, count);
|
|
skb_put_data(skb, buffer, len);
|
|
|
|
count -= len;
|
|
buffer += len;
|
|
|
|
/* Check for partial packet */
|
|
if (skb->len < hci_skb_expect(skb))
|
|
continue;
|
|
|
|
for (i = 0; i < pkts_count; i++) {
|
|
if (hci_skb_pkt_type(skb) == (&pkts[i])->type)
|
|
break;
|
|
}
|
|
|
|
if (i >= pkts_count) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EILSEQ);
|
|
}
|
|
|
|
if (skb->len == (&pkts[i])->hlen) {
|
|
u16 dlen;
|
|
|
|
switch ((&pkts[i])->lsize) {
|
|
case 0:
|
|
/* No variable data length */
|
|
dlen = 0;
|
|
break;
|
|
case 1:
|
|
/* Single octet variable length */
|
|
dlen = skb->data[(&pkts[i])->loff];
|
|
hci_skb_expect(skb) += dlen;
|
|
|
|
if (skb_tailroom(skb) < dlen) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EMSGSIZE);
|
|
}
|
|
break;
|
|
case 2:
|
|
/* Double octet variable length */
|
|
dlen = get_unaligned_le16(skb->data +
|
|
(&pkts[i])->loff);
|
|
hci_skb_expect(skb) += dlen;
|
|
|
|
if (skb_tailroom(skb) < dlen) {
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EMSGSIZE);
|
|
}
|
|
break;
|
|
default:
|
|
/* Unsupported variable length */
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EILSEQ);
|
|
}
|
|
|
|
if (!dlen) {
|
|
hu->padding = (skb->len + 1) % alignment;
|
|
hu->padding = (alignment - hu->padding) % alignment;
|
|
|
|
/* No more data, complete frame */
|
|
(&pkts[i])->recv(hdev, skb);
|
|
skb = NULL;
|
|
}
|
|
} else {
|
|
hu->padding = (skb->len + 1) % alignment;
|
|
hu->padding = (alignment - hu->padding) % alignment;
|
|
|
|
/* Complete frame */
|
|
(&pkts[i])->recv(hdev, skb);
|
|
skb = NULL;
|
|
}
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
EXPORT_SYMBOL_GPL(h4_recv_buf);
|