--- /dev/null
+/*
+ *
+ * Bluetooth HCI UART driver
+ *
+ * Copyright (C) 2011-2014 wifi_fae<wifi_fae@realtek.com.tw>
+ *
+ *
+ * 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/module.h>
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+#include <linux/bitrev.h>
+#include <asm/unaligned.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "hci_uart.h"
+
+#define VERSION "1.0"
+
+static int txcrc = 1;
+//static int hciextn = 1;
+
+#define H5_TXWINSIZE 4
+#define H5_ACK_PKT 0x00
+#define H5_LE_PKT 0x0F
+#define H5_VDRSPEC_PKT 0x0E
+
+struct h5_struct {
+ 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 */
+
+ unsigned long rx_count;
+ struct sk_buff *rx_skb;
+ u8 rxseq_txack; /* rxseq == txack. */
+ u8 rxack; /* Last packet sent by us that the peer ack'ed */
+ struct timer_list th5;
+
+ enum {
+ H5_W4_PKT_DELIMITER,
+ H5_W4_PKT_START,
+ H5_W4_HDR,
+ H5_W4_DATA,
+ H5_W4_CRC
+ } rx_state;
+
+ enum {
+ H5_ESCSTATE_NOESC,
+ H5_ESCSTATE_ESC
+ } rx_esc_state;
+
+ u8 use_crc;
+ u16 message_crc;
+ u8 txack_req; /* Do we need to send ack's to the peer? */
+
+ /* Reliable packet sequence number - used to assign seq to each rel pkt. */
+ u8 msgq_txseq;
+};
+
+/* ---- H5 CRC calculation ---- */
+
+/* Table for calculating CRC for polynomial 0x1021, LSB processed first,
+initial value 0xffff, bits shifted in reverse order. */
+
+static const u16 crc_table[] = {
+ 0x0000, 0x1081, 0x2102, 0x3183,
+ 0x4204, 0x5285, 0x6306, 0x7387,
+ 0x8408, 0x9489, 0xa50a, 0xb58b,
+ 0xc60c, 0xd68d, 0xe70e, 0xf78f
+};
+
+/* Initialise the crc calculator */
+#define H5_CRC_INIT(x) x = 0xffff
+
+/*
+ Update crc with next data byte
+
+ Implementation note
+ The data byte is treated as two nibbles. The crc is generated
+ in reverse, i.e., bits are fed into the register from the top.
+*/
+static void h5_crc_update(u16 *crc, u8 d)
+{
+ u16 reg = *crc;
+
+ reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f];
+ reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f];
+
+ *crc = reg;
+}
+
+/* ---- H5 core ---- */
+
+static void h5_slip_msgdelim(struct sk_buff *skb)
+{
+ const char pkt_delim = 0xc0;
+
+ memcpy(skb_put(skb, 1), &pkt_delim, 1);
+}
+
+static void h5_slip_one_byte(struct sk_buff *skb, u8 c)
+{
+ const char esc_c0[2] = { 0xdb, 0xdc };
+ const char esc_db[2] = { 0xdb, 0xdd };
+ const char esc_11[2] = { 0xdb, 0xde };
+ const char esc_13[2] = { 0xdb, 0xdf };
+
+ switch (c) {
+ case 0xc0:
+ memcpy(skb_put(skb, 2), &esc_c0, 2);
+ break;
+ case 0xdb:
+ memcpy(skb_put(skb, 2), &esc_db, 2);
+ break;
+ case 0x11:
+ memcpy(skb_put(skb, 2), &esc_11, 2);
+ break;
+ case 0x13:
+ memcpy(skb_put(skb, 2), &esc_13, 2);
+ break;
+ default:
+ memcpy(skb_put(skb, 1), &c, 1);
+ }
+}
+
+static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+ struct h5_struct *h5 = hu->priv;
+
+ if (skb->len > 0xFFF) { //Pkt length must be less than 4095 bytes
+ BT_ERR("Packet too long");
+ 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;
+ case H5_LE_PKT:
+ case H5_ACK_PKT:
+ case H5_VDRSPEC_PKT:
+ skb_queue_tail(&h5->unrel, skb); /* 3-wire LinkEstablishment*/
+ break;
+
+ default:
+ BT_ERR("Unknown packet type");
+ kfree_skb(skb);
+ break;
+ }
+
+ return 0;
+}
+
+static struct sk_buff *h5_prepare_pkt(struct h5_struct *h5, u8 *data,
+ int len, int pkt_type)
+{
+ struct sk_buff *nskb;
+ u8 hdr[4], chan;
+ u16 H5_CRC_INIT(h5_txmsg_crc);
+ int rel, i;
+
+ switch (pkt_type) {
+ case HCI_ACLDATA_PKT:
+ chan = 2; /* 3-wire ACL channel */
+ rel = 1; /* reliable channel */
+ break;
+ case HCI_COMMAND_PKT:
+ chan = 1; /* 3-wire cmd channel */
+ rel = 1; /* reliable channel */
+ break;
+ case HCI_EVENT_PKT:
+ chan = 4; /* 3-wire cmd channel */
+ rel = 1; /* reliable channel */
+ break;
+ case HCI_SCODATA_PKT:
+ chan = 3; /* 3-wire SCO channel */
+ rel = 0; /* unreliable channel */
+ break;
+ case H5_LE_PKT:
+ chan = 15; /* 3-wire LinkEstablishment channel */
+ rel = 0; /* unreliable channel */
+ break;
+ case H5_ACK_PKT:
+ chan = 0; /* 3-wire ACK channel */
+ rel = 0; /* unreliable channel */
+ break;
+ case H5_VDRSPEC_PKT:
+ chan = 14; /* 3-wire Vendor Specific channel */
+ rel = 0; /* unreliable channel */
+ break;
+ default:
+ BT_ERR("Unknown packet 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_msgdelim(nskb);
+
+ hdr[0] = h5->rxseq_txack << 3;
+ h5->txack_req = 0;
+ BT_DBG("We request packet no %u to card", h5->rxseq_txack);
+
+ if (rel) {
+ hdr[0] |= 0x80 + h5->msgq_txseq;
+ BT_DBG("Sending packet with seqno %u", h5->msgq_txseq);
+ h5->msgq_txseq = (h5->msgq_txseq + 1) & 0x07;
+ }
+
+ if (h5->use_crc)
+ hdr[0] |= 0x40;
+
+ hdr[1] = ((len << 4) & 0xff) | chan;
+ hdr[2] = len >> 4;
+ hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]);
+
+ /* Put H5 header */
+ for (i = 0; i < 4; i++) {
+ h5_slip_one_byte(nskb, hdr[i]);
+
+ if (h5->use_crc)
+ h5_crc_update(&h5_txmsg_crc, hdr[i]);
+ }
+
+ /* Put payload */
+ for (i = 0; i < len; i++) {
+ h5_slip_one_byte(nskb, data[i]);
+
+ if (h5->use_crc)
+ h5_crc_update(&h5_txmsg_crc, data[i]);
+ }
+
+ /* Put CRC */
+ if (h5->use_crc) {
+ h5_txmsg_crc = bitrev16(h5_txmsg_crc);
+ h5_slip_one_byte(nskb, (u8) ((h5_txmsg_crc >> 8) & 0x00ff));
+ h5_slip_one_byte(nskb, (u8) (h5_txmsg_crc & 0x00ff));
+ }
+
+ h5_slip_msgdelim(nskb);
+ return nskb;
+}
+
+/* This is a rewrite of pkt_avail in AH5 */
+static struct sk_buff *h5_dequeue(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ unsigned long flags;
+ struct sk_buff *skb;
+
+ /* First of all, check for unreliable messages in the queue,
+ since they have priority */
+
+ if ((skb = skb_dequeue(&h5->unrel)) != NULL) {
+ struct sk_buff *nskb = h5_prepare_pkt(h5, skb->data, skb->len, bt_cb(skb)->pkt_type);
+ if (nskb) {
+ kfree_skb(skb);
+ return nskb;
+ } else {
+ skb_queue_head(&h5->unrel, skb);
+ BT_ERR("Could not dequeue pkt because alloc_skb failed");
+ }
+ }
+
+ /* Now, try to send a reliable pkt. We can only send a
+ reliable packet if the number of packets sent but not yet ack'ed
+ is < than the winsize */
+
+ spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
+
+ if (h5->unack.qlen < H5_TXWINSIZE && (skb = skb_dequeue(&h5->rel)) != NULL) {
+ struct sk_buff *nskb = h5_prepare_pkt(h5, skb->data, skb->len, bt_cb(skb)->pkt_type);
+ if (nskb) {
+ __skb_queue_tail(&h5->unack, skb);
+ mod_timer(&h5->th5, jiffies + HZ / 4);
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+ return nskb;
+ } else {
+ skb_queue_head(&h5->rel, skb);
+ BT_ERR("Could not dequeue pkt because alloc_skb failed");
+ }
+ }
+
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+
+ /* We could not send a reliable packet, either because there are
+ none or because there are too many unack'ed pkts. Did we receive
+ any packets we have not acknowledged yet ? */
+
+ if (h5->txack_req) {
+ /* if so, craft an empty ACK pkt and send it on H5 unreliable
+ channel 0 */
+ struct sk_buff *nskb = h5_prepare_pkt(h5, NULL, 0, H5_ACK_PKT);
+ return nskb;
+ }
+
+ /* We have nothing to send */
+ return NULL;
+}
+
+static int h5_flush(struct hci_uart *hu)
+{
+ BT_DBG("hu %p", hu);
+ return 0;
+}
+
+/* Remove ack'ed packets */
+static void h5_pkt_cull(struct h5_struct *h5)
+{
+ struct sk_buff *skb, *tmp;
+ unsigned long flags;
+ int i, pkts_to_be_removed;
+ u8 seqno;
+
+ spin_lock_irqsave(&h5->unack.lock, flags);
+
+ pkts_to_be_removed = skb_queue_len(&h5->unack);
+ seqno = h5->msgq_txseq;
+
+ while (pkts_to_be_removed) {
+ if (h5->rxack == seqno)
+ break;
+ pkts_to_be_removed--;
+ seqno = (seqno - 1) & 0x07;
+ }
+
+ if (h5->rxack != seqno)
+ BT_ERR("Peer acked invalid packet");
+
+ BT_DBG("Removing %u pkts out of %u, up to seqno %u",
+ pkts_to_be_removed, skb_queue_len(&h5->unack),
+ (seqno - 1) & 0x07);
+
+ i = 0;
+ skb_queue_walk_safe(&h5->unack, skb, tmp) {
+ if (i >= pkts_to_be_removed)
+ break;
+ i++;
+
+ __skb_unlink(skb, &h5->unack);
+ kfree_skb(skb);
+ }
+
+ if (skb_queue_empty(&h5->unack))
+ del_timer(&h5->th5);
+
+ spin_unlock_irqrestore(&h5->unack.lock, flags);
+
+ if (i != pkts_to_be_removed)
+ BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed);
+}
+
+/* Handle H5 link-establishment packets. When we
+ detect a "sync" packet, symptom that the BT module has reset,
+ we do nothing :) (yet) */
+static void h5_handle_le_pkt(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ u8 conf_pkt[2] = { 0x03, 0xfc};
+ u8 conf_rsp_pkt[3] = { 0x04, 0x7b, 0x00};
+ u8 sync_pkt[2] = { 0x01, 0x7e};
+ u8 sync_rsp_pkt[2] = { 0x02, 0x7d};
+
+ u8 wakeup_pkt[2] = { 0x05, 0xfa};
+ u8 woken_pkt[2] = { 0x06, 0xf9};
+ u8 sleep_pkt[2] = { 0x07, 0x78};
+
+ /* spot "conf" pkts and reply with a "conf rsp" pkt */
+ if (h5->rx_skb->data[1] >> 4 == 2 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], conf_pkt, 2)) {
+ struct sk_buff *nskb = alloc_skb(3, GFP_ATOMIC);
+
+ BT_DBG("Found a LE conf pkt");
+ if (!nskb)
+ return;
+
+ conf_rsp_pkt[2] |= txcrc << 0x4; //crc check enable, version no = 0. needed to be as avariable.
+ memcpy(skb_put(nskb, 3), conf_rsp_pkt, 3);
+ bt_cb(nskb)->pkt_type = H5_LE_PKT;
+
+ skb_queue_head(&h5->unrel, nskb);
+ hci_uart_tx_wakeup(hu);
+ }
+ /* spot "conf resp" pkts*/
+ else if (h5->rx_skb->data[1] >> 4 == 2 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], conf_rsp_pkt, 2)) {
+ BT_DBG("Found a LE conf resp pkt, device go into active state");
+ txcrc = (h5->rx_skb->data[6] >> 0x4) & 0x1;
+ }
+
+ /* Spot "sync" pkts. If we find one...disaster! */
+ else if (h5->rx_skb->data[1] >> 4 == 2 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], sync_pkt, 2)) {
+ BT_ERR("Found a LE sync pkt, card has reset");
+ //DO Something here
+ }
+ /* Spot "sync resp" pkts. If we find one...disaster! */
+ else if (h5->rx_skb->data[1] >> 4 == 2 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], sync_rsp_pkt, 2)) {
+ BT_ERR("Found a LE sync resp pkt, device go into initialized state");
+ // DO Something here
+ }
+ /* Spot "wakeup" pkts. reply woken message when in active mode */
+ else if (h5->rx_skb->data[1] >> 4 == 2 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], wakeup_pkt, 2)) {
+ struct sk_buff *nskb = alloc_skb(2, GFP_ATOMIC);
+
+ BT_ERR("Found a LE Wakeup pkt, and reply woken message");
+ // DO Something here
+
+ memcpy(skb_put(nskb, 2), woken_pkt, 2);
+ bt_cb(nskb)->pkt_type = H5_LE_PKT;
+
+ skb_queue_head(&h5->unrel, nskb);
+ hci_uart_tx_wakeup(hu);
+ }
+ /* Spot "woken" pkts. receive woken message from device */
+ else if (h5->rx_skb->data[1] >> 4 == 2 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], woken_pkt, 2)) {
+ BT_ERR("Found a LE woken pkt from device");
+ // DO Something here
+ }
+ /* Spot "Sleep" pkts*/
+ else if (h5->rx_skb->data[1] >> 4 == 2 && h5->rx_skb->data[2] == 0 &&
+ !memcmp(&h5->rx_skb->data[4], sleep_pkt, 2)) {
+ BT_ERR("Found a LE Sleep pkt");
+ // DO Something here
+ }
+
+}
+
+static inline void h5_unslip_one_byte(struct h5_struct *h5, unsigned char byte)
+{
+ const u8 c0 = 0xc0, db = 0xdb;
+ const u8 oof1 = 0x11, oof2 = 0x13;
+
+ switch (h5->rx_esc_state) {
+ case H5_ESCSTATE_NOESC:
+ switch (byte) {
+ case 0xdb:
+ h5->rx_esc_state = H5_ESCSTATE_ESC;
+ break;
+ default:
+ memcpy(skb_put(h5->rx_skb, 1), &byte, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5->message_crc, byte);
+ h5->rx_count--;
+ }
+ break;
+
+ case H5_ESCSTATE_ESC:
+ switch (byte) {
+ case 0xdc:
+ memcpy(skb_put(h5->rx_skb, 1), &c0, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0xc0);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ case 0xdd:
+ memcpy(skb_put(h5->rx_skb, 1), &db, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 &&
+ h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, 0xdb);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ case 0xde:
+ memcpy(skb_put(h5->rx_skb, 1), &oof1, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 && h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, oof1);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ case 0xdf:
+ memcpy(skb_put(h5->rx_skb, 1), &oof2, 1);
+ if ((h5->rx_skb-> data[0] & 0x40) != 0 && h5->rx_state != H5_W4_CRC)
+ h5_crc_update(&h5-> message_crc, oof2);
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ h5->rx_count--;
+ break;
+
+ default:
+ BT_ERR ("Invalid byte %02x after esc byte", byte);
+ kfree_skb(h5->rx_skb);
+ h5->rx_skb = NULL;
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ }
+ }
+}
+
+static void h5_complete_rx_pkt(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ int pass_up;
+
+ if (h5->rx_skb->data[0] & 0x80) { /* reliable pkt */
+ BT_DBG("Received seqno %u from card", h5->rxseq_txack);
+ h5->rxseq_txack++;
+ h5->rxseq_txack %= 0x8;
+ h5->txack_req = 1;
+
+ /* If needed, transmit an ack pkt */
+ hci_uart_tx_wakeup(hu);
+ }
+
+ h5->rxack = (h5->rx_skb->data[0] >> 3) & 0x07;
+ BT_DBG("Request for pkt %u from card", h5->rxack);
+
+ h5_pkt_cull(h5);
+
+ if ((h5->rx_skb->data[1] & 0x0f) == 2 &&
+ h5->rx_skb->data[0] & 0x80) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_ACLDATA_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 4 &&
+ h5->rx_skb->data[0] & 0x80) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_EVENT_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 3) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_SCODATA_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 15 &&
+ !(h5->rx_skb->data[0] & 0x80)) {
+ //h5_handle_le_pkt(hu);//Link Establishment Pkt
+ pass_up = 0;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 1 &&
+ h5->rx_skb->data[0] & 0x80) {
+ bt_cb(h5->rx_skb)->pkt_type = HCI_COMMAND_PKT;
+ pass_up = 1;
+ } else if ((h5->rx_skb->data[1] & 0x0f) == 14) {
+ bt_cb(h5->rx_skb)->pkt_type = H5_VDRSPEC_PKT;
+ pass_up = 1;
+ } else
+ pass_up = 0;
+
+ if (!pass_up) {
+ struct hci_event_hdr hdr;
+ u8 desc = (h5->rx_skb->data[1] & 0x0f);
+
+ if (desc != H5_ACK_PKT && desc != H5_LE_PKT) {
+#if 0
+ if (hciextn) {
+ desc |= 0xc0;
+ skb_pull(h5->rx_skb, 4);
+ memcpy(skb_push(h5->rx_skb, 1), &desc, 1);
+
+ hdr.evt = 0xff;
+ hdr.plen = h5->rx_skb->len;
+ memcpy(skb_push(h5->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE);
+ bt_cb(h5->rx_skb)->pkt_type = HCI_EVENT_PKT;
+
+ hci_recv_frame(h5->rx_skb);
+ } else {
+#endif
+ BT_ERR ("Packet for unknown channel (%u %s)",
+ h5->rx_skb->data[1] & 0x0f,
+ h5->rx_skb->data[0] & 0x80 ?
+ "reliable" : "unreliable");
+ kfree_skb(h5->rx_skb);
+// }
+ } else
+ kfree_skb(h5->rx_skb);
+ } else {
+ /* Pull out H5 hdr */
+ skb_pull(h5->rx_skb, 4);
+
+ hci_recv_frame(h5->rx_skb);
+ }
+
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_skb = NULL;
+}
+
+static u16 bscp_get_crc(struct h5_struct *h5)
+{
+ return get_unaligned_be16(&h5->rx_skb->data[h5->rx_skb->len - 2]);
+}
+
+/* Recv data */
+static int h5_recv(struct hci_uart *hu, void *data, int count)
+{
+ struct h5_struct *h5 = hu->priv;
+ register unsigned char *ptr;
+
+ BT_DBG("hu %p count %d rx_state %d rx_count %ld",
+ hu, count, h5->rx_state, h5->rx_count);
+
+ ptr = data;
+ while (count) {
+ if (h5->rx_count) {
+ if (*ptr == 0xc0) {
+ BT_ERR("Short H5 packet");
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_START;
+ h5->rx_count = 0;
+ } else
+ h5_unslip_one_byte(h5, *ptr);
+
+ ptr++; count--;
+ continue;
+ }
+
+ switch (h5->rx_state) {
+ case H5_W4_HDR:
+ if ((0xff & (u8) ~ (h5->rx_skb->data[0] + h5->rx_skb->data[1] +
+ h5->rx_skb->data[2])) != h5->rx_skb->data[3]) {
+ BT_ERR("Error in H5 hdr checksum");
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+ if (h5->rx_skb->data[0] & 0x80 /* reliable pkt */
+ && (h5->rx_skb->data[0] & 0x07) != h5->rxseq_txack) {
+ BT_ERR ("Out-of-order packet arrived, got %u expected %u",
+ h5->rx_skb->data[0] & 0x07, h5->rxseq_txack);
+
+ h5->txack_req = 1;
+ hci_uart_tx_wakeup(hu);
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+ h5->rx_state = H5_W4_DATA;
+ h5->rx_count = (h5->rx_skb->data[1] >> 4) +
+ (h5->rx_skb->data[2] << 4); /* May be 0 */
+ continue;
+
+ case H5_W4_DATA:
+ if (h5->rx_skb->data[0] & 0x40) { /* pkt with crc */
+ h5->rx_state = H5_W4_CRC;
+ h5->rx_count = 2;
+ } else
+ h5_complete_rx_pkt(hu);
+ continue;
+
+ case H5_W4_CRC:
+ if (bitrev16(h5->message_crc) != bscp_get_crc(h5)) {
+ BT_ERR ("Checksum failed: computed %04x received %04x",
+ bitrev16(h5->message_crc),
+ bscp_get_crc(h5));
+
+ kfree_skb(h5->rx_skb);
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ continue;
+ }
+ skb_trim(h5->rx_skb, h5->rx_skb->len - 2);
+ h5_complete_rx_pkt(hu);
+ continue;
+
+ case H5_W4_PKT_DELIMITER:
+ switch (*ptr) {
+ case 0xc0:
+ h5->rx_state = H5_W4_PKT_START;
+ break;
+ default:
+ /*BT_ERR("Ignoring byte %02x", *ptr);*/
+ break;
+ }
+ ptr++; count--;
+ break;
+
+ case H5_W4_PKT_START:
+ switch (*ptr) {
+ case 0xc0:
+ ptr++; count--;
+ break;
+
+ default:
+ h5->rx_state = H5_W4_HDR;
+ h5->rx_count = 4;
+ h5->rx_esc_state = H5_ESCSTATE_NOESC;
+ H5_CRC_INIT(h5->message_crc);
+
+ /* Do not increment ptr or decrement count
+ * Allocate packet. Max len of a H5 pkt=
+ * 0xFFF (payload) +4 (header) +2 (crc) */
+
+ h5->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC);
+ if (!h5->rx_skb) {
+ BT_ERR("Can't allocate mem for new packet");
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+ h5->rx_count = 0;
+ return 0;
+ }
+ h5->rx_skb->dev = (void *) hu->hdev;
+ break;
+ }
+ break;
+ }
+ }
+ return count;
+}
+
+ /* Arrange to retransmit all messages in the relq. */
+static void h5_timed_event(unsigned long arg)
+{
+ struct hci_uart *hu = (struct hci_uart *) arg;
+ struct h5_struct *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);
+}
+
+static int h5_open(struct hci_uart *hu)
+{
+ struct h5_struct *h5;
+
+ BT_DBG("hu %p", hu);
+
+ h5 = kzalloc(sizeof(*h5), GFP_ATOMIC);
+ 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);
+
+ init_timer(&h5->th5);
+ h5->th5.function = h5_timed_event;
+ h5->th5.data = (u_long) hu;
+
+ h5->rx_state = H5_W4_PKT_DELIMITER;
+
+ if (txcrc)
+ h5->use_crc = 1;
+
+ return 0;
+}
+
+static int h5_close(struct hci_uart *hu)
+{
+ struct h5_struct *h5 = hu->priv;
+ hu->priv = NULL;
+
+ BT_DBG("hu %p", hu);
+
+ skb_queue_purge(&h5->unack);
+ skb_queue_purge(&h5->rel);
+ skb_queue_purge(&h5->unrel);
+ del_timer(&h5->th5);
+
+ kfree(h5);
+ return 0;
+}
+
+static struct hci_uart_proto h5 = {
+ .id = HCI_UART_3WIRE,
+ .open = h5_open,
+ .close = h5_close,
+ .enqueue = h5_enqueue,
+ .dequeue = h5_dequeue,
+ .recv = h5_recv,
+ .flush = h5_flush
+};
+
+int h5_init(void)
+{
+ int err = hci_uart_register_proto(&h5);
+
+ if (!err)
+ BT_INFO("HCI Realtek H5 protocol initialized");
+ else
+ BT_ERR("HCI Realtek H5 protocol registration failed");
+
+ return err;
+}
+
+int h5_deinit(void)
+{
+ return hci_uart_unregister_proto(&h5);
+}
+
+#if 0
+module_param(hciextn, bool, 0644);
+MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into H5 packets-3wire test");
+#endif
projects / firefly-linux-kernel-4.4.55.git / commitdiff