2012-07-16 13:12:02 +00:00
|
|
|
/*
|
|
|
|
*
|
|
|
|
* 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"
|
|
|
|
|
2012-07-16 13:12:04 +00:00
|
|
|
#define H5_TXWINSIZE 4
|
|
|
|
|
|
|
|
#define H5_ACK_TIMEOUT msecs_to_jiffies(250)
|
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
/*
|
|
|
|
* Maximum Three-wire packet:
|
|
|
|
* 4 byte header + max value for 12-bit length + 2 bytes for CRC
|
|
|
|
*/
|
|
|
|
#define H5_MAX_LEN (4 + 0xfff + 2)
|
|
|
|
|
|
|
|
#define SLIP_DELIMITER 0xc0
|
|
|
|
#define SLIP_ESC 0xdb
|
|
|
|
#define SLIP_ESC_DELIM 0xdc
|
|
|
|
#define SLIP_ESC_ESC 0xdd
|
|
|
|
|
2012-07-16 13:12:03 +00:00
|
|
|
struct h5 {
|
2012-07-16 13:12:05 +00:00
|
|
|
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; /* Receive buffer */
|
|
|
|
size_t rx_pending; /* Expecting more bytes */
|
|
|
|
bool rx_esc; /* SLIP escape mode */
|
2012-07-16 13:12:03 +00:00
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
int (*rx_func) (struct hci_uart *hu, u8 c);
|
2012-07-16 13:12:03 +00:00
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
struct timer_list timer; /* Retransmission timer */
|
2012-07-16 13:12:04 +00:00
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
bool txack_req;
|
2012-07-16 13:12:03 +00:00
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
u8 msgq_txseq;
|
2012-07-16 13:12:03 +00:00
|
|
|
};
|
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
static void h5_reset_rx(struct h5 *h5);
|
|
|
|
|
2012-07-16 13:12:04 +00:00
|
|
|
static void h5_timed_event(unsigned long arg)
|
|
|
|
{
|
|
|
|
struct hci_uart *hu = (struct hci_uart *) arg;
|
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen);
|
|
|
|
|
|
|
|
spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
|
|
|
|
|
|
|
|
while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
|
|
|
|
h5->msgq_txseq = (h5->msgq_txseq - 1) & 0x07;
|
|
|
|
skb_queue_head(&h5->rel, skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&h5->unack.lock, flags);
|
|
|
|
|
|
|
|
hci_uart_tx_wakeup(hu);
|
|
|
|
}
|
|
|
|
|
2012-07-16 13:12:02 +00:00
|
|
|
static int h5_open(struct hci_uart *hu)
|
|
|
|
{
|
2012-07-16 13:12:03 +00:00
|
|
|
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);
|
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
h5_reset_rx(h5);
|
|
|
|
|
2012-07-16 13:12:04 +00:00
|
|
|
init_timer(&h5->timer);
|
|
|
|
h5->timer.function = h5_timed_event;
|
|
|
|
h5->timer.data = (unsigned long) hu;
|
|
|
|
|
2012-07-16 13:12:03 +00:00
|
|
|
return 0;
|
2012-07-16 13:12:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_close(struct hci_uart *hu)
|
|
|
|
{
|
2012-07-16 13:12:03 +00:00
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
|
|
|
|
skb_queue_purge(&h5->unack);
|
|
|
|
skb_queue_purge(&h5->rel);
|
|
|
|
skb_queue_purge(&h5->unrel);
|
|
|
|
|
2012-07-16 13:12:04 +00:00
|
|
|
del_timer(&h5->timer);
|
|
|
|
|
2012-07-16 13:12:03 +00:00
|
|
|
kfree(h5);
|
|
|
|
|
|
|
|
return 0;
|
2012-07-16 13:12:02 +00:00
|
|
|
}
|
|
|
|
|
2012-07-16 13:12:05 +00:00
|
|
|
static void h5_handle_internal_rx(struct hci_uart *hu)
|
|
|
|
{
|
|
|
|
BT_DBG("%s", hu->hdev->name);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void h5_complete_rx_pkt(struct hci_uart *hu)
|
|
|
|
{
|
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
u8 pkt_type;
|
|
|
|
|
|
|
|
BT_DBG("%s", hu->hdev->name);
|
|
|
|
|
|
|
|
pkt_type = h5->rx_skb->data[1] & 0x0f;
|
|
|
|
|
|
|
|
switch (pkt_type) {
|
|
|
|
case HCI_EVENT_PKT:
|
|
|
|
case HCI_ACLDATA_PKT:
|
|
|
|
case HCI_SCODATA_PKT:
|
|
|
|
bt_cb(h5->rx_skb)->pkt_type = pkt_type;
|
|
|
|
|
|
|
|
/* Remove Three-wire header */
|
|
|
|
skb_pull(h5->rx_skb, 4);
|
|
|
|
|
|
|
|
hci_recv_frame(h5->rx_skb);
|
|
|
|
h5->rx_skb = NULL;
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
h5_handle_internal_rx(hu);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
h5_reset_rx(h5);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_rx_crc(struct hci_uart *hu, unsigned char c)
|
|
|
|
{
|
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
|
|
|
|
BT_DBG("%s 0x%02hhx", hu->hdev->name, c);
|
|
|
|
|
|
|
|
h5_complete_rx_pkt(hu);
|
|
|
|
h5_reset_rx(h5);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_rx_payload(struct hci_uart *hu, unsigned char c)
|
|
|
|
{
|
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
const unsigned char *hdr = h5->rx_skb->data;
|
|
|
|
|
|
|
|
BT_DBG("%s 0x%02hhx", hu->hdev->name, c);
|
|
|
|
|
|
|
|
if ((hdr[0] >> 4) & 0x01) {
|
|
|
|
h5->rx_func = h5_rx_crc;
|
|
|
|
h5->rx_pending = 2;
|
|
|
|
} else {
|
|
|
|
h5_complete_rx_pkt(hu);
|
|
|
|
h5_reset_rx(h5);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)
|
|
|
|
{
|
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
const unsigned char *hdr = h5->rx_skb->data;
|
|
|
|
|
|
|
|
BT_DBG("%s 0x%02hhx", hu->hdev->name, c);
|
|
|
|
|
|
|
|
if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) {
|
|
|
|
BT_ERR("Invalid header checksum");
|
|
|
|
h5_reset_rx(h5);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
h5->rx_func = h5_rx_payload;
|
|
|
|
h5->rx_pending = ((hdr[1] >> 4) & 0xff) + (hdr[2] << 4);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c)
|
|
|
|
{
|
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
|
|
|
|
BT_DBG("%s 0x%02hhx", hu->hdev->name, c);
|
|
|
|
|
|
|
|
if (c == SLIP_DELIMITER)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
h5->rx_func = h5_rx_3wire_hdr;
|
|
|
|
h5->rx_pending = 4;
|
|
|
|
|
|
|
|
h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC);
|
|
|
|
if (!h5->rx_skb) {
|
|
|
|
BT_ERR("Can't allocate mem for new packet");
|
|
|
|
h5_reset_rx(h5);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
h5->rx_skb->dev = (void *) hu->hdev;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c)
|
|
|
|
{
|
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
|
|
|
|
BT_DBG("%s 0x%02hhx", hu->hdev->name, c);
|
|
|
|
|
|
|
|
if (c == SLIP_DELIMITER)
|
|
|
|
h5->rx_func = h5_rx_pkt_start;
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void h5_unslip_one_byte(struct h5 *h5, unsigned char c)
|
|
|
|
{
|
|
|
|
const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC;
|
|
|
|
const u8 *byte = &c;
|
|
|
|
|
|
|
|
if (!h5->rx_esc && c == SLIP_ESC) {
|
|
|
|
h5->rx_esc = true;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (h5->rx_esc) {
|
|
|
|
switch (c) {
|
|
|
|
case SLIP_ESC_DELIM:
|
|
|
|
byte = &delim;
|
|
|
|
break;
|
|
|
|
case SLIP_ESC_ESC:
|
|
|
|
byte = &esc;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
BT_ERR("Invalid esc byte 0x%02hhx", c);
|
|
|
|
h5_reset_rx(h5);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
h5->rx_esc = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(skb_put(h5->rx_skb, 1), byte, 1);
|
|
|
|
h5->rx_pending--;
|
|
|
|
|
|
|
|
BT_DBG("unsliped 0x%02hhx", *byte);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void h5_reset_rx(struct h5 *h5)
|
|
|
|
{
|
|
|
|
if (h5->rx_skb) {
|
|
|
|
kfree_skb(h5->rx_skb);
|
|
|
|
h5->rx_skb = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
h5->rx_func = h5_rx_delimiter;
|
|
|
|
h5->rx_pending = 0;
|
|
|
|
h5->rx_esc = false;
|
|
|
|
}
|
|
|
|
|
2012-07-16 13:12:02 +00:00
|
|
|
static int h5_recv(struct hci_uart *hu, void *data, int count)
|
|
|
|
{
|
2012-07-16 13:12:05 +00:00
|
|
|
struct h5 *h5 = hu->priv;
|
|
|
|
unsigned char *ptr = data;
|
|
|
|
|
|
|
|
BT_DBG("%s count %d", hu->hdev->name, count);
|
|
|
|
|
|
|
|
while (count > 0) {
|
|
|
|
int processed;
|
|
|
|
|
|
|
|
if (h5->rx_pending > 0) {
|
|
|
|
if (*ptr == SLIP_DELIMITER) {
|
|
|
|
BT_ERR("Too short H5 packet");
|
|
|
|
h5_reset_rx(h5);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
h5_unslip_one_byte(h5, *ptr);
|
|
|
|
|
|
|
|
ptr++; count--;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
processed = h5->rx_func(hu, *ptr);
|
|
|
|
if (processed < 0)
|
|
|
|
return processed;
|
|
|
|
|
|
|
|
ptr += processed;
|
|
|
|
count -= processed;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2012-07-16 13:12:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
|
|
|
|
{
|
2012-07-16 13:12:03 +00:00
|
|
|
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;
|
2012-07-16 13:12:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct sk_buff *h5_dequeue(struct hci_uart *hu)
|
|
|
|
{
|
2012-07-16 13:12:03 +00:00
|
|
|
struct h5 *h5 = hu->priv;
|
2012-07-16 13:12:04 +00:00
|
|
|
unsigned long flags;
|
2012-07-16 13:12:03 +00:00
|
|
|
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");
|
|
|
|
}
|
|
|
|
|
2012-07-16 13:12:04 +00:00
|
|
|
spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
|
|
|
|
|
|
|
|
if (h5->unack.qlen >= H5_TXWINSIZE)
|
|
|
|
goto unlock;
|
|
|
|
|
|
|
|
if ((skb = skb_dequeue(&h5->rel)) != NULL) {
|
|
|
|
nskb = h5_prepare_pkt(h5, skb);
|
|
|
|
|
|
|
|
if (nskb) {
|
|
|
|
__skb_queue_tail(&h5->unack, skb);
|
|
|
|
mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT);
|
|
|
|
spin_unlock_irqrestore(&h5->unack.lock, flags);
|
|
|
|
return nskb;
|
|
|
|
}
|
|
|
|
|
|
|
|
skb_queue_head(&h5->rel, skb);
|
|
|
|
BT_ERR("Could not dequeue pkt because alloc_skb failed");
|
|
|
|
}
|
|
|
|
|
|
|
|
unlock:
|
|
|
|
spin_unlock_irqrestore(&h5->unack.lock, flags);
|
|
|
|
|
2012-07-16 13:12:03 +00:00
|
|
|
if (h5->txack_req)
|
|
|
|
return h5_prepare_ack(h5);
|
|
|
|
|
2012-07-16 13:12:02 +00:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h5_flush(struct hci_uart *hu)
|
|
|
|
{
|
2012-07-16 13:12:03 +00:00
|
|
|
BT_DBG("hu %p", hu);
|
|
|
|
return 0;
|
2012-07-16 13:12:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|