diff options
author | Marcel Holtmann <marcel@holtmann.org> | 2015-04-05 04:59:24 (GMT) |
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committer | Marcel Holtmann <marcel@holtmann.org> | 2015-04-07 16:47:09 (GMT) |
commit | e1a38d70d8e07db6fbf93621f289c08bbcca0ba3 (patch) | |
tree | 295b065ba37ffeb3d1a9606fd22111c616054ae3 /drivers/bluetooth/hci_h4.c | |
parent | 9d1c40ebb66416f166b92c6828af48549ca99307 (diff) | |
download | linux-e1a38d70d8e07db6fbf93621f289c08bbcca0ba3.tar.xz |
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: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Diffstat (limited to 'drivers/bluetooth/hci_h4.c')
-rw-r--r-- | drivers/bluetooth/hci_h4.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_h4.c b/drivers/bluetooth/hci_h4.c index 97a5df4..09270bc 100644 --- a/drivers/bluetooth/hci_h4.c +++ b/drivers/bluetooth/hci_h4.c @@ -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; +} |