mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 01:01:52 +00:00
7d664fbafa
This patch adds basic state tracking and socket buffer handling to the Three-wire UART (H5) HCI driver. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
177 lines
3.4 KiB
C
177 lines
3.4 KiB
C
/*
|
|
*
|
|
* Bluetooth HCI Three-wire UART driver
|
|
*
|
|
* Copyright (C) 2012 Intel Corporation
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
#include <net/bluetooth/bluetooth.h>
|
|
#include <net/bluetooth/hci_core.h>
|
|
|
|
#include "hci_uart.h"
|
|
|
|
struct h5 {
|
|
struct sk_buff_head unack; /* Unack'ed packets queue */
|
|
struct sk_buff_head rel; /* Reliable packets queue */
|
|
struct sk_buff_head unrel; /* Unreliable packets queue */
|
|
|
|
struct sk_buff *rx_skb;
|
|
|
|
bool txack_req;
|
|
|
|
u8 msgq_txseq;
|
|
};
|
|
|
|
static int h5_open(struct hci_uart *hu)
|
|
{
|
|
struct h5 *h5;
|
|
|
|
BT_DBG("hu %p", hu);
|
|
|
|
h5 = kzalloc(sizeof(*h5), GFP_KERNEL);
|
|
if (!h5)
|
|
return -ENOMEM;
|
|
|
|
hu->priv = h5;
|
|
|
|
skb_queue_head_init(&h5->unack);
|
|
skb_queue_head_init(&h5->rel);
|
|
skb_queue_head_init(&h5->unrel);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int h5_close(struct hci_uart *hu)
|
|
{
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
skb_queue_purge(&h5->unack);
|
|
skb_queue_purge(&h5->rel);
|
|
skb_queue_purge(&h5->unrel);
|
|
|
|
kfree(h5);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int h5_recv(struct hci_uart *hu, void *data, int count)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
|
|
{
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
if (skb->len > 0xfff) {
|
|
BT_ERR("Packet too long (%u bytes)", skb->len);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
switch (bt_cb(skb)->pkt_type) {
|
|
case HCI_ACLDATA_PKT:
|
|
case HCI_COMMAND_PKT:
|
|
skb_queue_tail(&h5->rel, skb);
|
|
break;
|
|
|
|
case HCI_SCODATA_PKT:
|
|
skb_queue_tail(&h5->unrel, skb);
|
|
break;
|
|
|
|
default:
|
|
BT_ERR("Unknown packet type %u", bt_cb(skb)->pkt_type);
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct sk_buff *h5_prepare_pkt(struct h5 *h5, struct sk_buff *skb)
|
|
{
|
|
h5->txack_req = false;
|
|
return NULL;
|
|
}
|
|
|
|
static struct sk_buff *h5_prepare_ack(struct h5 *h5)
|
|
{
|
|
h5->txack_req = false;
|
|
return NULL;
|
|
}
|
|
|
|
static struct sk_buff *h5_dequeue(struct hci_uart *hu)
|
|
{
|
|
struct h5 *h5 = hu->priv;
|
|
struct sk_buff *skb, *nskb;
|
|
|
|
if ((skb = skb_dequeue(&h5->unrel)) != NULL) {
|
|
nskb = h5_prepare_pkt(h5, skb);
|
|
if (nskb) {
|
|
kfree_skb(skb);
|
|
return nskb;
|
|
}
|
|
|
|
skb_queue_head(&h5->unrel, skb);
|
|
BT_ERR("Could not dequeue pkt because alloc_skb failed");
|
|
}
|
|
|
|
if (h5->txack_req)
|
|
return h5_prepare_ack(h5);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int h5_flush(struct hci_uart *hu)
|
|
{
|
|
BT_DBG("hu %p", hu);
|
|
return 0;
|
|
}
|
|
|
|
static struct hci_uart_proto h5p = {
|
|
.id = HCI_UART_3WIRE,
|
|
.open = h5_open,
|
|
.close = h5_close,
|
|
.recv = h5_recv,
|
|
.enqueue = h5_enqueue,
|
|
.dequeue = h5_dequeue,
|
|
.flush = h5_flush,
|
|
};
|
|
|
|
int __init h5_init(void)
|
|
{
|
|
int err = hci_uart_register_proto(&h5p);
|
|
|
|
if (!err)
|
|
BT_INFO("HCI Three-wire UART (H5) protocol initialized");
|
|
else
|
|
BT_ERR("HCI Three-wire UART (H5) protocol init failed");
|
|
|
|
return err;
|
|
}
|
|
|
|
int __exit h5_deinit(void)
|
|
{
|
|
return hci_uart_unregister_proto(&h5p);
|
|
}
|