3 * Generic Bluetooth HCI UART driver
5 * Copyright (C) 2015-2018 Intel Corporation
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <asm/unaligned.h>
27 u8 type; /* Packet type */
28 u8 hlen; /* Header length */
29 u8 loff; /* Data length offset in header */
30 u8 lsize; /* Data length field size */
31 u16 maxlen; /* Max overall packet length */
32 int (*recv)(struct hci_dev *hdev, struct sk_buff *skb);
36 .type = HCI_ACLDATA_PKT, \
37 .hlen = HCI_ACL_HDR_SIZE, \
40 .maxlen = HCI_MAX_FRAME_SIZE \
43 .type = HCI_SCODATA_PKT, \
44 .hlen = HCI_SCO_HDR_SIZE, \
47 .maxlen = HCI_MAX_SCO_SIZE
49 #define H4_RECV_EVENT \
50 .type = HCI_EVENT_PKT, \
51 .hlen = HCI_EVENT_HDR_SIZE, \
54 .maxlen = HCI_MAX_EVENT_SIZE
56 static inline struct sk_buff *h4_recv_buf(struct hci_dev *hdev,
58 const unsigned char *buffer,
60 const struct h4_recv_pkt *pkts,
63 /* Check for error from previous call */
71 for (i = 0; i < pkts_count; i++) {
72 if (buffer[0] != (&pkts[i])->type)
75 skb = bt_skb_alloc((&pkts[i])->maxlen,
78 return ERR_PTR(-ENOMEM);
80 hci_skb_pkt_type(skb) = (&pkts[i])->type;
81 hci_skb_expect(skb) = (&pkts[i])->hlen;
85 /* Check for invalid packet type */
87 return ERR_PTR(-EILSEQ);
93 len = min_t(uint, hci_skb_expect(skb) - skb->len, count);
94 skb_put_data(skb, buffer, len);
99 /* Check for partial packet */
100 if (skb->len < hci_skb_expect(skb))
103 for (i = 0; i < pkts_count; i++) {
104 if (hci_skb_pkt_type(skb) == (&pkts[i])->type)
108 if (i >= pkts_count) {
110 return ERR_PTR(-EILSEQ);
113 if (skb->len == (&pkts[i])->hlen) {
116 switch ((&pkts[i])->lsize) {
118 /* No variable data length */
122 /* Single octet variable length */
123 dlen = skb->data[(&pkts[i])->loff];
124 hci_skb_expect(skb) += dlen;
126 if (skb_tailroom(skb) < dlen) {
128 return ERR_PTR(-EMSGSIZE);
132 /* Double octet variable length */
133 dlen = get_unaligned_le16(skb->data +
135 hci_skb_expect(skb) += dlen;
137 if (skb_tailroom(skb) < dlen) {
139 return ERR_PTR(-EMSGSIZE);
143 /* Unsupported variable length */
145 return ERR_PTR(-EILSEQ);
149 /* No more data, complete frame */
150 (&pkts[i])->recv(hdev, skb);
155 (&pkts[i])->recv(hdev, skb);