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Bluetooth: hci_uart: Introduce h4_recv_buf helper function

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The h4_recv_buf helper function can be used for receiving H:4 packets
out of a TTY stream. It is self-contained and allows for reuse by all
HCI UART protocols.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2015-04-04 21:59:24 -07:00
parent 9d1c40ebb6
commit e1a38d70d8
2 changed files with 101 additions and 0 deletions
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98
drivers/bluetooth/hci_h4.c
View File

@ -161,3 +161,101 @@ 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)
{
while (count) {
int len;
if (!skb) {
switch (buffer[0]) {
case HCI_ACLDATA_PKT:
skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
bt_cb(skb)->expect = HCI_ACL_HDR_SIZE;
break;
case HCI_SCODATA_PKT:
skb = bt_skb_alloc(HCI_MAX_SCO_SIZE,
GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
bt_cb(skb)->expect = HCI_SCO_HDR_SIZE;
break;
case HCI_EVENT_PKT:
skb = bt_skb_alloc(HCI_MAX_EVENT_SIZE,
GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
bt_cb(skb)->expect = HCI_EVENT_HDR_SIZE;
break;
default:
return ERR_PTR(-EILSEQ);
}
count -= 1;
buffer += 1;
}
len = min_t(uint, bt_cb(skb)->expect, count);
memcpy(skb_put(skb, len), buffer, len);
count -= len;
buffer += len;
bt_cb(skb)->expect -= len;
switch (bt_cb(skb)->pkt_type) {
case HCI_ACLDATA_PKT:
if (skb->len == HCI_ACL_HDR_SIZE) {
__le16 dlen = hci_acl_hdr(skb)->dlen;
/* Complete ACL header */
bt_cb(skb)->expect = __le16_to_cpu(dlen);
if (skb_tailroom(skb) < bt_cb(skb)->expect) {
kfree_skb(skb);
return ERR_PTR(-EMSGSIZE);
}
}
break;
case HCI_SCODATA_PKT:
if (skb->len == HCI_SCO_HDR_SIZE) {
/* Complete SCO header */
bt_cb(skb)->expect = hci_sco_hdr(skb)->dlen;
if (skb_tailroom(skb) < bt_cb(skb)->expect) {
kfree_skb(skb);
return ERR_PTR(-EMSGSIZE);
}
}
break;
case HCI_EVENT_PKT:
if (skb->len == HCI_EVENT_HDR_SIZE) {
/* Complete event header */
bt_cb(skb)->expect = hci_event_hdr(skb)->plen;
if (skb_tailroom(skb) < bt_cb(skb)->expect) {
kfree_skb(skb);
return ERR_PTR(-EMSGSIZE);
}
}
break;
}
if (bt_cb(skb)->expect == 0) {
/* Complete frame */
hci_recv_frame(hdev, skb);
skb = NULL;
}
}
return skb;
}

3
drivers/bluetooth/hci_uart.h
View File

@ -99,6 +99,9 @@ int hci_uart_init_ready(struct hci_uart *hu);
#ifdef CONFIG_BT_HCIUART_H4
int h4_init(void);
int h4_deinit(void);
struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
const unsigned char *buffer, int count);
#endif
#ifdef CONFIG_BT_HCIUART_BCSP