746 lines
16 KiB
C
746 lines
16 KiB
C
/*
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*
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* Bluetooth HCI Three-wire UART driver
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*
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* Copyright (C) 2012 Intel Corporation
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include "hci_uart.h"
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#define HCI_3WIRE_ACK_PKT 0
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#define HCI_3WIRE_LINK_PKT 15
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/* Sliding window size */
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#define H5_TX_WIN_MAX 4
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#define H5_ACK_TIMEOUT msecs_to_jiffies(250)
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#define H5_SYNC_TIMEOUT msecs_to_jiffies(100)
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/*
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* Maximum Three-wire packet:
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* 4 byte header + max value for 12-bit length + 2 bytes for CRC
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*/
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#define H5_MAX_LEN (4 + 0xfff + 2)
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/* Convenience macros for reading Three-wire header values */
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#define H5_HDR_SEQ(hdr) ((hdr)[0] & 0x07)
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#define H5_HDR_ACK(hdr) (((hdr)[0] >> 3) & 0x07)
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#define H5_HDR_CRC(hdr) (((hdr)[0] >> 6) & 0x01)
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#define H5_HDR_RELIABLE(hdr) (((hdr)[0] >> 7) & 0x01)
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#define H5_HDR_PKT_TYPE(hdr) ((hdr)[1] & 0x0f)
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#define H5_HDR_LEN(hdr) ((((hdr)[1] >> 4) & 0xff) + ((hdr)[2] << 4))
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#define SLIP_DELIMITER 0xc0
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#define SLIP_ESC 0xdb
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#define SLIP_ESC_DELIM 0xdc
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#define SLIP_ESC_ESC 0xdd
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/* H5 state flags */
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enum {
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H5_RX_ESC, /* SLIP escape mode */
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H5_TX_ACK_REQ, /* Pending ack to send */
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};
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struct h5 {
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struct sk_buff_head unack; /* Unack'ed packets queue */
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struct sk_buff_head rel; /* Reliable packets queue */
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struct sk_buff_head unrel; /* Unreliable packets queue */
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unsigned long flags;
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struct sk_buff *rx_skb; /* Receive buffer */
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size_t rx_pending; /* Expecting more bytes */
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u8 rx_ack; /* Last ack number received */
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int (*rx_func) (struct hci_uart *hu, u8 c);
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struct timer_list timer; /* Retransmission timer */
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u8 tx_seq; /* Next seq number to send */
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u8 tx_ack; /* Next ack number to send */
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u8 tx_win; /* Sliding window size */
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enum {
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H5_UNINITIALIZED,
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H5_INITIALIZED,
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H5_ACTIVE,
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} state;
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enum {
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H5_AWAKE,
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H5_SLEEPING,
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H5_WAKING_UP,
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} sleep;
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};
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static void h5_reset_rx(struct h5 *h5);
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static void h5_link_control(struct hci_uart *hu, const void *data, size_t len)
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{
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struct h5 *h5 = hu->priv;
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struct sk_buff *nskb;
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nskb = alloc_skb(3, GFP_ATOMIC);
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if (!nskb)
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return;
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bt_cb(nskb)->pkt_type = HCI_3WIRE_LINK_PKT;
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memcpy(skb_put(nskb, len), data, len);
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skb_queue_tail(&h5->unrel, nskb);
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}
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static u8 h5_cfg_field(struct h5 *h5)
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{
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u8 field = 0;
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/* Sliding window size (first 3 bits) */
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field |= (h5->tx_win & 7);
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return field;
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}
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static void h5_timed_event(unsigned long arg)
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{
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const unsigned char sync_req[] = { 0x01, 0x7e };
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unsigned char conf_req[] = { 0x03, 0xfc, 0x01 };
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struct hci_uart *hu = (struct hci_uart *) arg;
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struct h5 *h5 = hu->priv;
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struct sk_buff *skb;
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unsigned long flags;
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BT_DBG("%s", hu->hdev->name);
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if (h5->state == H5_UNINITIALIZED)
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h5_link_control(hu, sync_req, sizeof(sync_req));
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if (h5->state == H5_INITIALIZED) {
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conf_req[2] = h5_cfg_field(h5);
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h5_link_control(hu, conf_req, sizeof(conf_req));
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}
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if (h5->state != H5_ACTIVE) {
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mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);
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goto wakeup;
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}
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if (h5->sleep != H5_AWAKE) {
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h5->sleep = H5_SLEEPING;
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goto wakeup;
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}
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BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen);
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spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
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while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
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h5->tx_seq = (h5->tx_seq - 1) & 0x07;
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skb_queue_head(&h5->rel, skb);
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}
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spin_unlock_irqrestore(&h5->unack.lock, flags);
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wakeup:
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hci_uart_tx_wakeup(hu);
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}
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static int h5_open(struct hci_uart *hu)
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{
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struct h5 *h5;
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const unsigned char sync[] = { 0x01, 0x7e };
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BT_DBG("hu %p", hu);
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h5 = kzalloc(sizeof(*h5), GFP_KERNEL);
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if (!h5)
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return -ENOMEM;
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hu->priv = h5;
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skb_queue_head_init(&h5->unack);
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skb_queue_head_init(&h5->rel);
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skb_queue_head_init(&h5->unrel);
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h5_reset_rx(h5);
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init_timer(&h5->timer);
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h5->timer.function = h5_timed_event;
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h5->timer.data = (unsigned long) hu;
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h5->tx_win = H5_TX_WIN_MAX;
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set_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags);
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/* Send initial sync request */
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h5_link_control(hu, sync, sizeof(sync));
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mod_timer(&h5->timer, jiffies + H5_SYNC_TIMEOUT);
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return 0;
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}
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static int h5_close(struct hci_uart *hu)
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{
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struct h5 *h5 = hu->priv;
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del_timer_sync(&h5->timer);
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skb_queue_purge(&h5->unack);
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skb_queue_purge(&h5->rel);
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skb_queue_purge(&h5->unrel);
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kfree(h5);
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return 0;
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}
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static void h5_pkt_cull(struct h5 *h5)
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{
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struct sk_buff *skb, *tmp;
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unsigned long flags;
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int i, to_remove;
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u8 seq;
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spin_lock_irqsave(&h5->unack.lock, flags);
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to_remove = skb_queue_len(&h5->unack);
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if (to_remove == 0)
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goto unlock;
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seq = h5->tx_seq;
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while (to_remove > 0) {
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if (h5->rx_ack == seq)
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break;
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to_remove--;
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seq = (seq - 1) & 0x07;
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}
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if (seq != h5->rx_ack)
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BT_ERR("Controller acked invalid packet");
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i = 0;
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skb_queue_walk_safe(&h5->unack, skb, tmp) {
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if (i++ >= to_remove)
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break;
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__skb_unlink(skb, &h5->unack);
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kfree_skb(skb);
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}
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if (skb_queue_empty(&h5->unack))
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del_timer(&h5->timer);
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unlock:
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spin_unlock_irqrestore(&h5->unack.lock, flags);
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}
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static void h5_handle_internal_rx(struct hci_uart *hu)
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{
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struct h5 *h5 = hu->priv;
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const unsigned char sync_req[] = { 0x01, 0x7e };
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const unsigned char sync_rsp[] = { 0x02, 0x7d };
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unsigned char conf_req[] = { 0x03, 0xfc, 0x01 };
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const unsigned char conf_rsp[] = { 0x04, 0x7b };
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const unsigned char wakeup_req[] = { 0x05, 0xfa };
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const unsigned char woken_req[] = { 0x06, 0xf9 };
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const unsigned char sleep_req[] = { 0x07, 0x78 };
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const unsigned char *hdr = h5->rx_skb->data;
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const unsigned char *data = &h5->rx_skb->data[4];
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BT_DBG("%s", hu->hdev->name);
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if (H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT)
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return;
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if (H5_HDR_LEN(hdr) < 2)
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return;
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conf_req[2] = h5_cfg_field(h5);
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if (memcmp(data, sync_req, 2) == 0) {
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h5_link_control(hu, sync_rsp, 2);
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} else if (memcmp(data, sync_rsp, 2) == 0) {
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h5->state = H5_INITIALIZED;
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h5_link_control(hu, conf_req, 3);
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} else if (memcmp(data, conf_req, 2) == 0) {
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h5_link_control(hu, conf_rsp, 2);
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h5_link_control(hu, conf_req, 3);
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} else if (memcmp(data, conf_rsp, 2) == 0) {
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if (H5_HDR_LEN(hdr) > 2)
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h5->tx_win = (data[2] & 7);
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BT_DBG("Three-wire init complete. tx_win %u", h5->tx_win);
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h5->state = H5_ACTIVE;
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hci_uart_init_ready(hu);
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return;
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} else if (memcmp(data, sleep_req, 2) == 0) {
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BT_DBG("Peer went to sleep");
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h5->sleep = H5_SLEEPING;
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return;
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} else if (memcmp(data, woken_req, 2) == 0) {
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BT_DBG("Peer woke up");
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h5->sleep = H5_AWAKE;
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} else if (memcmp(data, wakeup_req, 2) == 0) {
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BT_DBG("Peer requested wakeup");
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h5_link_control(hu, woken_req, 2);
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h5->sleep = H5_AWAKE;
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} else {
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BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]);
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return;
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}
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hci_uart_tx_wakeup(hu);
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}
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static void h5_complete_rx_pkt(struct hci_uart *hu)
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{
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struct h5 *h5 = hu->priv;
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const unsigned char *hdr = h5->rx_skb->data;
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if (H5_HDR_RELIABLE(hdr)) {
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h5->tx_ack = (h5->tx_ack + 1) % 8;
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set_bit(H5_TX_ACK_REQ, &h5->flags);
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hci_uart_tx_wakeup(hu);
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}
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h5->rx_ack = H5_HDR_ACK(hdr);
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h5_pkt_cull(h5);
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switch (H5_HDR_PKT_TYPE(hdr)) {
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case HCI_EVENT_PKT:
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case HCI_ACLDATA_PKT:
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case HCI_SCODATA_PKT:
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bt_cb(h5->rx_skb)->pkt_type = H5_HDR_PKT_TYPE(hdr);
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/* Remove Three-wire header */
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skb_pull(h5->rx_skb, 4);
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hci_recv_frame(hu->hdev, h5->rx_skb);
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h5->rx_skb = NULL;
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break;
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default:
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h5_handle_internal_rx(hu);
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break;
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}
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h5_reset_rx(h5);
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}
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static int h5_rx_crc(struct hci_uart *hu, unsigned char c)
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{
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h5_complete_rx_pkt(hu);
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return 0;
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}
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static int h5_rx_payload(struct hci_uart *hu, unsigned char c)
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{
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struct h5 *h5 = hu->priv;
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const unsigned char *hdr = h5->rx_skb->data;
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if (H5_HDR_CRC(hdr)) {
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h5->rx_func = h5_rx_crc;
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h5->rx_pending = 2;
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} else {
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h5_complete_rx_pkt(hu);
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}
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return 0;
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}
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static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)
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{
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struct h5 *h5 = hu->priv;
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const unsigned char *hdr = h5->rx_skb->data;
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BT_DBG("%s rx: seq %u ack %u crc %u rel %u type %u len %u",
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hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
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H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
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H5_HDR_LEN(hdr));
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if (((hdr[0] + hdr[1] + hdr[2] + hdr[3]) & 0xff) != 0xff) {
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BT_ERR("Invalid header checksum");
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h5_reset_rx(h5);
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return 0;
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}
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if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) {
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BT_ERR("Out-of-order packet arrived (%u != %u)",
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H5_HDR_SEQ(hdr), h5->tx_ack);
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h5_reset_rx(h5);
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return 0;
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}
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if (h5->state != H5_ACTIVE &&
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H5_HDR_PKT_TYPE(hdr) != HCI_3WIRE_LINK_PKT) {
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BT_ERR("Non-link packet received in non-active state");
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h5_reset_rx(h5);
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return 0;
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}
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h5->rx_func = h5_rx_payload;
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h5->rx_pending = H5_HDR_LEN(hdr);
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return 0;
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}
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static int h5_rx_pkt_start(struct hci_uart *hu, unsigned char c)
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{
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struct h5 *h5 = hu->priv;
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if (c == SLIP_DELIMITER)
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return 1;
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h5->rx_func = h5_rx_3wire_hdr;
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h5->rx_pending = 4;
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h5->rx_skb = bt_skb_alloc(H5_MAX_LEN, GFP_ATOMIC);
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if (!h5->rx_skb) {
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BT_ERR("Can't allocate mem for new packet");
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h5_reset_rx(h5);
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return -ENOMEM;
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}
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h5->rx_skb->dev = (void *) hu->hdev;
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return 0;
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}
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|
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static int h5_rx_delimiter(struct hci_uart *hu, unsigned char c)
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{
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struct h5 *h5 = hu->priv;
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if (c == SLIP_DELIMITER)
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h5->rx_func = h5_rx_pkt_start;
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return 1;
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}
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static void h5_unslip_one_byte(struct h5 *h5, unsigned char c)
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{
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const u8 delim = SLIP_DELIMITER, esc = SLIP_ESC;
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const u8 *byte = &c;
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if (!test_bit(H5_RX_ESC, &h5->flags) && c == SLIP_ESC) {
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set_bit(H5_RX_ESC, &h5->flags);
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return;
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}
|
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|
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if (test_and_clear_bit(H5_RX_ESC, &h5->flags)) {
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switch (c) {
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case SLIP_ESC_DELIM:
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byte = &delim;
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break;
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case SLIP_ESC_ESC:
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byte = &esc;
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break;
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default:
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BT_ERR("Invalid esc byte 0x%02hhx", c);
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h5_reset_rx(h5);
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return;
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}
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}
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memcpy(skb_put(h5->rx_skb, 1), byte, 1);
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h5->rx_pending--;
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|
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BT_DBG("unsliped 0x%02hhx, rx_pending %zu", *byte, h5->rx_pending);
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}
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|
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static void h5_reset_rx(struct h5 *h5)
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{
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if (h5->rx_skb) {
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kfree_skb(h5->rx_skb);
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h5->rx_skb = NULL;
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}
|
|
|
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h5->rx_func = h5_rx_delimiter;
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h5->rx_pending = 0;
|
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clear_bit(H5_RX_ESC, &h5->flags);
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}
|
|
|
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static int h5_recv(struct hci_uart *hu, void *data, int count)
|
|
{
|
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struct h5 *h5 = hu->priv;
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unsigned char *ptr = data;
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|
|
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BT_DBG("%s pending %zu count %d", hu->hdev->name, h5->rx_pending,
|
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count);
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|
|
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while (count > 0) {
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int processed;
|
|
|
|
if (h5->rx_pending > 0) {
|
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if (*ptr == SLIP_DELIMITER) {
|
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BT_ERR("Too short H5 packet");
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h5_reset_rx(h5);
|
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continue;
|
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}
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|
|
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h5_unslip_one_byte(h5, *ptr);
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|
|
|
ptr++; count--;
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continue;
|
|
}
|
|
|
|
processed = h5->rx_func(hu, *ptr);
|
|
if (processed < 0)
|
|
return processed;
|
|
|
|
ptr += processed;
|
|
count -= processed;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if (h5->state != H5_ACTIVE) {
|
|
BT_ERR("Ignoring HCI data in non-active state");
|
|
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 void h5_slip_delim(struct sk_buff *skb)
|
|
{
|
|
const char delim = SLIP_DELIMITER;
|
|
|
|
memcpy(skb_put(skb, 1), &delim, 1);
|
|
}
|
|
|
|
static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
|
|
{
|
|
const char esc_delim[2] = { SLIP_ESC, SLIP_ESC_DELIM };
|
|
const char esc_esc[2] = { SLIP_ESC, SLIP_ESC_ESC };
|
|
|
|
switch (c) {
|
|
case SLIP_DELIMITER:
|
|
memcpy(skb_put(skb, 2), &esc_delim, 2);
|
|
break;
|
|
case SLIP_ESC:
|
|
memcpy(skb_put(skb, 2), &esc_esc, 2);
|
|
break;
|
|
default:
|
|
memcpy(skb_put(skb, 1), &c, 1);
|
|
}
|
|
}
|
|
|
|
static bool valid_packet_type(u8 type)
|
|
{
|
|
switch (type) {
|
|
case HCI_ACLDATA_PKT:
|
|
case HCI_COMMAND_PKT:
|
|
case HCI_SCODATA_PKT:
|
|
case HCI_3WIRE_LINK_PKT:
|
|
case HCI_3WIRE_ACK_PKT:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static struct sk_buff *h5_prepare_pkt(struct hci_uart *hu, u8 pkt_type,
|
|
const u8 *data, size_t len)
|
|
{
|
|
struct h5 *h5 = hu->priv;
|
|
struct sk_buff *nskb;
|
|
u8 hdr[4];
|
|
int i;
|
|
|
|
if (!valid_packet_type(pkt_type)) {
|
|
BT_ERR("Unknown packet type %u", pkt_type);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Max len of packet: (original len + 4 (H5 hdr) + 2 (crc)) * 2
|
|
* (because bytes 0xc0 and 0xdb are escaped, worst case is when
|
|
* the packet is all made of 0xc0 and 0xdb) + 2 (0xc0
|
|
* delimiters at start and end).
|
|
*/
|
|
nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
|
|
if (!nskb)
|
|
return NULL;
|
|
|
|
bt_cb(nskb)->pkt_type = pkt_type;
|
|
|
|
h5_slip_delim(nskb);
|
|
|
|
hdr[0] = h5->tx_ack << 3;
|
|
clear_bit(H5_TX_ACK_REQ, &h5->flags);
|
|
|
|
/* Reliable packet? */
|
|
if (pkt_type == HCI_ACLDATA_PKT || pkt_type == HCI_COMMAND_PKT) {
|
|
hdr[0] |= 1 << 7;
|
|
hdr[0] |= h5->tx_seq;
|
|
h5->tx_seq = (h5->tx_seq + 1) % 8;
|
|
}
|
|
|
|
hdr[1] = pkt_type | ((len & 0x0f) << 4);
|
|
hdr[2] = len >> 4;
|
|
hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff);
|
|
|
|
BT_DBG("%s tx: seq %u ack %u crc %u rel %u type %u len %u",
|
|
hu->hdev->name, H5_HDR_SEQ(hdr), H5_HDR_ACK(hdr),
|
|
H5_HDR_CRC(hdr), H5_HDR_RELIABLE(hdr), H5_HDR_PKT_TYPE(hdr),
|
|
H5_HDR_LEN(hdr));
|
|
|
|
for (i = 0; i < 4; i++)
|
|
h5_slip_one_byte(nskb, hdr[i]);
|
|
|
|
for (i = 0; i < len; i++)
|
|
h5_slip_one_byte(nskb, data[i]);
|
|
|
|
h5_slip_delim(nskb);
|
|
|
|
return nskb;
|
|
}
|
|
|
|
static struct sk_buff *h5_dequeue(struct hci_uart *hu)
|
|
{
|
|
struct h5 *h5 = hu->priv;
|
|
unsigned long flags;
|
|
struct sk_buff *skb, *nskb;
|
|
|
|
if (h5->sleep != H5_AWAKE) {
|
|
const unsigned char wakeup_req[] = { 0x05, 0xfa };
|
|
|
|
if (h5->sleep == H5_WAKING_UP)
|
|
return NULL;
|
|
|
|
h5->sleep = H5_WAKING_UP;
|
|
BT_DBG("Sending wakeup request");
|
|
|
|
mod_timer(&h5->timer, jiffies + HZ / 100);
|
|
return h5_prepare_pkt(hu, HCI_3WIRE_LINK_PKT, wakeup_req, 2);
|
|
}
|
|
|
|
skb = skb_dequeue(&h5->unrel);
|
|
if (skb != NULL) {
|
|
nskb = h5_prepare_pkt(hu, bt_cb(skb)->pkt_type,
|
|
skb->data, skb->len);
|
|
if (nskb) {
|
|
kfree_skb(skb);
|
|
return nskb;
|
|
}
|
|
|
|
skb_queue_head(&h5->unrel, skb);
|
|
BT_ERR("Could not dequeue pkt because alloc_skb failed");
|
|
}
|
|
|
|
spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
|
|
|
|
if (h5->unack.qlen >= h5->tx_win)
|
|
goto unlock;
|
|
|
|
skb = skb_dequeue(&h5->rel);
|
|
if (skb != NULL) {
|
|
nskb = h5_prepare_pkt(hu, bt_cb(skb)->pkt_type,
|
|
skb->data, skb->len);
|
|
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);
|
|
|
|
if (test_bit(H5_TX_ACK_REQ, &h5->flags))
|
|
return h5_prepare_pkt(hu, HCI_3WIRE_ACK_PKT, NULL, 0);
|
|
|
|
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);
|
|
}
|