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- /*
- *
- * 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 <linux/version.h>
- #include "hci_uart.h"
- #ifdef BTCOEX
- #include "rtk_coex.h"
- #endif
- //#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;
- struct delayed_work retrans_work;
- struct hci_uart *hu; /* Parent HCI UART */
- 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;
- u16 message_crc;
- u8 use_crc;
- u8 rxack; /* Last packet sent by us that the peer ack'ed */
- u8 rxseq_txack; /* rxseq == txack. */
- 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;
- /* The spin lock protects seq, ack and ack req */
- spinlock_t lock;
- };
- /* ---- 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;
- u8 tmp;
- unsigned long flags;
- 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);
- spin_lock_irqsave(&h5->lock, flags);
- tmp = h5->rxseq_txack;
- hdr[0] = h5->rxseq_txack << 3;
- h5->txack_req = 0;
- spin_unlock_irqrestore(&h5->lock, flags);
- BT_DBG("We request packet no %u to card", tmp);
- if (rel) {
- spin_lock_irqsave(&h5->lock, flags);
- tmp = h5->msgq_txseq;
- hdr[0] |= 0x80 + h5->msgq_txseq;
- h5->msgq_txseq = (h5->msgq_txseq + 1) & 0x07;
- spin_unlock_irqrestore(&h5->lock, flags);
- BT_DBG("Sending packet with seqno %u", tmp);
- }
- 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);
- schedule_delayed_work(&h5->retrans_work, 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))
- cancel_delayed_work(&h5->retrans_work);
- 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) */
- #if 0
- 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_indent: Standard input:620: Error:Unmatched 'else'
- skb->data[4], sleep_pkt, 2)) {
- BT_ERR("Found a LE Sleep pkt");
- // DO Something here
- }
- }
- #endif
- 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 */
- unsigned long flags;
- u8 rxseq;
- spin_lock_irqsave(&h5->lock, flags);
- rxseq = h5->rxseq_txack;
- h5->rxseq_txack++;
- h5->rxseq_txack %= 0x8;
- h5->txack_req = 1;
- spin_unlock_irqrestore(&h5->lock, flags);
- BT_DBG("Received seqno %u from card", rxseq);
- }
- h5->rxack = (h5->rx_skb->data[0] >> 3) & 0x07;
- BT_DBG("Request for pkt %u from card", h5->rxack);
- h5_pkt_cull(h5);
- hci_uart_tx_wakeup(hu);
- 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 (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 { */
- 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);
- #ifdef BTCOEX
- if (bt_cb(h5->rx_skb)->pkt_type == HCI_EVENT_PKT)
- rtk_btcoex_parse_event(h5->rx_skb->data,
- h5->rx_skb->len);
- if (bt_cb(h5->rx_skb)->pkt_type == HCI_ACLDATA_PKT)
- rtk_btcoex_parse_l2cap_data_rx(h5->rx_skb->data,
- h5->rx_skb->len);
- #endif
- #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
- hci_recv_frame(h5->rx_skb);
- #else
- hci_recv_frame(hu->hdev, h5->rx_skb);
- #endif
- }
- 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;
- u8 rxseq;
- unsigned long flags;
- 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;
- }
- rxseq = h5->rxseq_txack;
- if (h5->rx_skb->data[0] & 0x80 /* reliable pkt */
- && (h5->rx_skb->data[0] & 0x07) != rxseq) {
- BT_ERR("Out-of-order packet arrived, got %u expected %u",
- h5->rx_skb->data[0] & 0x07, rxseq);
- spin_lock_irqsave(&h5->lock, flags);
- h5->txack_req = 1;
- spin_unlock_irqrestore(&h5->lock, flags);
- 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(struct work_struct *work)
- {
- struct h5_struct *h5;
- struct hci_uart *hu;
- unsigned long flags;
- unsigned long flags2;
- struct sk_buff *skb;
- h5 = container_of(work, struct h5_struct, retrans_work.work);
- hu = h5->hu;
- BT_INFO("hu %p retransmitting %u pkts", hu, h5->unack.qlen);
- spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
- /* Move the pkt from unack queue to the head of reliable tx queue and
- * roll back the tx seq number
- */
- while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
- spin_lock_irqsave(&h5->lock, flags2);
- h5->msgq_txseq = (h5->msgq_txseq - 1) & 0x07;
- spin_unlock_irqrestore(&h5->lock, flags2);
- 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);
- BT_INFO("h5_open");
- 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);
- spin_lock_init(&h5->lock);
- h5->hu = hu;
- INIT_DELAYED_WORK(&h5->retrans_work, (void *)h5_timed_event);
- 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;
- BT_INFO("h5_close");
- cancel_delayed_work_sync(&h5->retrans_work);
- hu->priv = NULL;
- skb_queue_purge(&h5->unack);
- skb_queue_purge(&h5->rel);
- skb_queue_purge(&h5->unrel);
- 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);
- }
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