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Bluetooth: hci_uart: add support for word alignment 

This will be used by Nokia's H4+ protocol, which
uses 2-byte aligned packets.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Sebastian Reichel 2017-03-28 17:59:34 +02:00 committed by Marcel Holtmann
parent 756db77874
commit aeac301406
3 changed files with 24 additions and 0 deletions
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17
drivers/bluetooth/hci_h4.c
View File

@ -171,9 +171,20 @@ 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;
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)
@ -253,11 +264,17 @@ struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
}
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;

4
drivers/bluetooth/hci_ldisc.c
View File

@ -459,6 +459,10 @@ static int hci_uart_tty_open(struct tty_struct *tty)
hu->tty = tty;
tty->receive_room = 65536;
/* disable alignment support by default */
hu->alignment = 1;
hu->padding = 0;
INIT_WORK(&hu->init_ready, hci_uart_init_work);
INIT_WORK(&hu->write_work, hci_uart_write_work);

3
drivers/bluetooth/hci_uart.h
View File

@ -92,6 +92,9 @@ struct hci_uart {
unsigned int init_speed;
unsigned int oper_speed;
u8 alignment;
u8 padding;
};
/* HCI_UART proto flag bits */