Commit e1a38d70 authored by Marcel Holtmann's avatar Marcel Holtmann
Browse files

Bluetooth: hci_uart: Introduce h4_recv_buf helper function 



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: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarJohan Hedberg <johan.hedberg@intel.com>
parent 9d1c40eb

drivers/bluetooth/hci_h4.c

+98 −0
Original line number Diff line number Diff line
@@ -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;

}

drivers/bluetooth/hci_uart.h

+3 −0
Original line number Diff line number Diff line
@@ -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