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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/bluetooth/hci_bcsp.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/bluetooth/hci_bcsp.c')
-rw-r--r-- | drivers/bluetooth/hci_bcsp.c | 784 |
1 files changed, 784 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_bcsp.c b/drivers/bluetooth/hci_bcsp.c new file mode 100644 index 0000000000..2a5a27d713 --- /dev/null +++ b/drivers/bluetooth/hci_bcsp.c @@ -0,0 +1,784 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Bluetooth HCI UART driver + * + * Copyright (C) 2002-2003 Fabrizio Gennari <fabrizio.gennari@philips.com> + * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> + */ + +#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" + +static bool txcrc = true; +static bool hciextn = true; + +#define BCSP_TXWINSIZE 4 + +#define BCSP_ACK_PKT 0x05 +#define BCSP_LE_PKT 0x06 + +struct bcsp_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 tbcsp; + struct hci_uart *hu; + + enum { + BCSP_W4_PKT_DELIMITER, + BCSP_W4_PKT_START, + BCSP_W4_BCSP_HDR, + BCSP_W4_DATA, + BCSP_W4_CRC + } rx_state; + + enum { + BCSP_ESCSTATE_NOESC, + BCSP_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; +}; + +/* ---- BCSP 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 BCSP_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 bcsp_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; +} + +/* ---- BCSP core ---- */ + +static void bcsp_slip_msgdelim(struct sk_buff *skb) +{ + const char pkt_delim = 0xc0; + + skb_put_data(skb, &pkt_delim, 1); +} + +static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c) +{ + const char esc_c0[2] = { 0xdb, 0xdc }; + const char esc_db[2] = { 0xdb, 0xdd }; + + switch (c) { + case 0xc0: + skb_put_data(skb, &esc_c0, 2); + break; + case 0xdb: + skb_put_data(skb, &esc_db, 2); + break; + default: + skb_put_data(skb, &c, 1); + } +} + +static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb) +{ + struct bcsp_struct *bcsp = hu->priv; + + if (skb->len > 0xFFF) { + BT_ERR("Packet too long"); + kfree_skb(skb); + return 0; + } + + switch (hci_skb_pkt_type(skb)) { + case HCI_ACLDATA_PKT: + case HCI_COMMAND_PKT: + skb_queue_tail(&bcsp->rel, skb); + break; + + case HCI_SCODATA_PKT: + skb_queue_tail(&bcsp->unrel, skb); + break; + + default: + BT_ERR("Unknown packet type"); + kfree_skb(skb); + break; + } + + return 0; +} + +static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data, + int len, int pkt_type) +{ + struct sk_buff *nskb; + u8 hdr[4], chan; + u16 BCSP_CRC_INIT(bcsp_txmsg_crc); + int rel, i; + + switch (pkt_type) { + case HCI_ACLDATA_PKT: + chan = 6; /* BCSP ACL channel */ + rel = 1; /* reliable channel */ + break; + case HCI_COMMAND_PKT: + chan = 5; /* BCSP cmd/evt channel */ + rel = 1; /* reliable channel */ + break; + case HCI_SCODATA_PKT: + chan = 7; /* BCSP SCO channel */ + rel = 0; /* unreliable channel */ + break; + case BCSP_LE_PKT: + chan = 1; /* BCSP LE channel */ + rel = 0; /* unreliable channel */ + break; + case BCSP_ACK_PKT: + chan = 0; /* BCSP internal channel */ + rel = 0; /* unreliable channel */ + break; + default: + BT_ERR("Unknown packet type"); + return NULL; + } + + if (hciextn && chan == 5) { + __le16 opcode = ((struct hci_command_hdr *)data)->opcode; + + /* Vendor specific commands */ + if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) { + u8 desc = *(data + HCI_COMMAND_HDR_SIZE); + + if ((desc & 0xf0) == 0xc0) { + data += HCI_COMMAND_HDR_SIZE + 1; + len -= HCI_COMMAND_HDR_SIZE + 1; + chan = desc & 0x0f; + } + } + } + + /* Max len of packet: (original len +4(bcsp 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; + + hci_skb_pkt_type(nskb) = pkt_type; + + bcsp_slip_msgdelim(nskb); + + hdr[0] = bcsp->rxseq_txack << 3; + bcsp->txack_req = 0; + BT_DBG("We request packet no %u to card", bcsp->rxseq_txack); + + if (rel) { + hdr[0] |= 0x80 + bcsp->msgq_txseq; + BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq); + bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07; + } + + if (bcsp->use_crc) + hdr[0] |= 0x40; + + hdr[1] = ((len << 4) & 0xff) | chan; + hdr[2] = len >> 4; + hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]); + + /* Put BCSP header */ + for (i = 0; i < 4; i++) { + bcsp_slip_one_byte(nskb, hdr[i]); + + if (bcsp->use_crc) + bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]); + } + + /* Put payload */ + for (i = 0; i < len; i++) { + bcsp_slip_one_byte(nskb, data[i]); + + if (bcsp->use_crc) + bcsp_crc_update(&bcsp_txmsg_crc, data[i]); + } + + /* Put CRC */ + if (bcsp->use_crc) { + bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc); + bcsp_slip_one_byte(nskb, (u8)((bcsp_txmsg_crc >> 8) & 0x00ff)); + bcsp_slip_one_byte(nskb, (u8)(bcsp_txmsg_crc & 0x00ff)); + } + + bcsp_slip_msgdelim(nskb); + return nskb; +} + +/* This is a rewrite of pkt_avail in ABCSP */ +static struct sk_buff *bcsp_dequeue(struct hci_uart *hu) +{ + struct bcsp_struct *bcsp = hu->priv; + unsigned long flags; + struct sk_buff *skb; + + /* First of all, check for unreliable messages in the queue, + * since they have priority + */ + + skb = skb_dequeue(&bcsp->unrel); + if (skb != NULL) { + struct sk_buff *nskb; + + nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, + hci_skb_pkt_type(skb)); + if (nskb) { + kfree_skb(skb); + return nskb; + } else { + skb_queue_head(&bcsp->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(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); + + if (bcsp->unack.qlen < BCSP_TXWINSIZE) { + skb = skb_dequeue(&bcsp->rel); + if (skb != NULL) { + struct sk_buff *nskb; + + nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len, + hci_skb_pkt_type(skb)); + if (nskb) { + __skb_queue_tail(&bcsp->unack, skb); + mod_timer(&bcsp->tbcsp, jiffies + HZ / 4); + spin_unlock_irqrestore(&bcsp->unack.lock, flags); + return nskb; + } else { + skb_queue_head(&bcsp->rel, skb); + BT_ERR("Could not dequeue pkt because alloc_skb failed"); + } + } + } + + spin_unlock_irqrestore(&bcsp->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 (bcsp->txack_req) { + /* if so, craft an empty ACK pkt and send it on BCSP unreliable + * channel 0 + */ + struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT); + return nskb; + } + + /* We have nothing to send */ + return NULL; +} + +static int bcsp_flush(struct hci_uart *hu) +{ + BT_DBG("hu %p", hu); + return 0; +} + +/* Remove ack'ed packets */ +static void bcsp_pkt_cull(struct bcsp_struct *bcsp) +{ + struct sk_buff *skb, *tmp; + unsigned long flags; + int i, pkts_to_be_removed; + u8 seqno; + + spin_lock_irqsave(&bcsp->unack.lock, flags); + + pkts_to_be_removed = skb_queue_len(&bcsp->unack); + seqno = bcsp->msgq_txseq; + + while (pkts_to_be_removed) { + if (bcsp->rxack == seqno) + break; + pkts_to_be_removed--; + seqno = (seqno - 1) & 0x07; + } + + if (bcsp->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(&bcsp->unack), + (seqno - 1) & 0x07); + + i = 0; + skb_queue_walk_safe(&bcsp->unack, skb, tmp) { + if (i >= pkts_to_be_removed) + break; + i++; + + __skb_unlink(skb, &bcsp->unack); + dev_kfree_skb_irq(skb); + } + + if (skb_queue_empty(&bcsp->unack)) + del_timer(&bcsp->tbcsp); + + spin_unlock_irqrestore(&bcsp->unack.lock, flags); + + if (i != pkts_to_be_removed) + BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed); +} + +/* Handle BCSP link-establishment packets. When we + * detect a "sync" packet, symptom that the BT module has reset, + * we do nothing :) (yet) + */ +static void bcsp_handle_le_pkt(struct hci_uart *hu) +{ + struct bcsp_struct *bcsp = hu->priv; + u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed }; + u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 }; + u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed }; + + /* spot "conf" pkts and reply with a "conf rsp" pkt */ + if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && + !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) { + struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC); + + BT_DBG("Found a LE conf pkt"); + if (!nskb) + return; + skb_put_data(nskb, conf_rsp_pkt, 4); + hci_skb_pkt_type(nskb) = BCSP_LE_PKT; + + skb_queue_head(&bcsp->unrel, nskb); + hci_uart_tx_wakeup(hu); + } + /* Spot "sync" pkts. If we find one...disaster! */ + else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 && + !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) { + BT_ERR("Found a LE sync pkt, card has reset"); + } +} + +static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte) +{ + const u8 c0 = 0xc0, db = 0xdb; + + switch (bcsp->rx_esc_state) { + case BCSP_ESCSTATE_NOESC: + switch (byte) { + case 0xdb: + bcsp->rx_esc_state = BCSP_ESCSTATE_ESC; + break; + default: + skb_put_data(bcsp->rx_skb, &byte, 1); + if ((bcsp->rx_skb->data[0] & 0x40) != 0 && + bcsp->rx_state != BCSP_W4_CRC) + bcsp_crc_update(&bcsp->message_crc, byte); + bcsp->rx_count--; + } + break; + + case BCSP_ESCSTATE_ESC: + switch (byte) { + case 0xdc: + skb_put_data(bcsp->rx_skb, &c0, 1); + if ((bcsp->rx_skb->data[0] & 0x40) != 0 && + bcsp->rx_state != BCSP_W4_CRC) + bcsp_crc_update(&bcsp->message_crc, 0xc0); + bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; + bcsp->rx_count--; + break; + + case 0xdd: + skb_put_data(bcsp->rx_skb, &db, 1); + if ((bcsp->rx_skb->data[0] & 0x40) != 0 && + bcsp->rx_state != BCSP_W4_CRC) + bcsp_crc_update(&bcsp->message_crc, 0xdb); + bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; + bcsp->rx_count--; + break; + + default: + BT_ERR("Invalid byte %02x after esc byte", byte); + kfree_skb(bcsp->rx_skb); + bcsp->rx_skb = NULL; + bcsp->rx_state = BCSP_W4_PKT_DELIMITER; + bcsp->rx_count = 0; + } + } +} + +static void bcsp_complete_rx_pkt(struct hci_uart *hu) +{ + struct bcsp_struct *bcsp = hu->priv; + int pass_up = 0; + + if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */ + BT_DBG("Received seqno %u from card", bcsp->rxseq_txack); + + /* check the rx sequence number is as expected */ + if ((bcsp->rx_skb->data[0] & 0x07) == bcsp->rxseq_txack) { + bcsp->rxseq_txack++; + bcsp->rxseq_txack %= 0x8; + } else { + /* handle re-transmitted packet or + * when packet was missed + */ + BT_ERR("Out-of-order packet arrived, got %u expected %u", + bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack); + + /* do not process out-of-order packet payload */ + pass_up = 2; + } + + /* send current txack value to all received reliable packets */ + bcsp->txack_req = 1; + + /* If needed, transmit an ack pkt */ + hci_uart_tx_wakeup(hu); + } + + bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07; + BT_DBG("Request for pkt %u from card", bcsp->rxack); + + /* handle received ACK indications, + * including those from out-of-order packets + */ + bcsp_pkt_cull(bcsp); + + if (pass_up != 2) { + if ((bcsp->rx_skb->data[1] & 0x0f) == 6 && + (bcsp->rx_skb->data[0] & 0x80)) { + hci_skb_pkt_type(bcsp->rx_skb) = HCI_ACLDATA_PKT; + pass_up = 1; + } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 && + (bcsp->rx_skb->data[0] & 0x80)) { + hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; + pass_up = 1; + } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) { + hci_skb_pkt_type(bcsp->rx_skb) = HCI_SCODATA_PKT; + pass_up = 1; + } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 && + !(bcsp->rx_skb->data[0] & 0x80)) { + bcsp_handle_le_pkt(hu); + pass_up = 0; + } else { + pass_up = 0; + } + } + + if (pass_up == 0) { + struct hci_event_hdr hdr; + u8 desc = (bcsp->rx_skb->data[1] & 0x0f); + + if (desc != 0 && desc != 1) { + if (hciextn) { + desc |= 0xc0; + skb_pull(bcsp->rx_skb, 4); + memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1); + + hdr.evt = 0xff; + hdr.plen = bcsp->rx_skb->len; + memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE); + hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT; + + hci_recv_frame(hu->hdev, bcsp->rx_skb); + } else { + BT_ERR("Packet for unknown channel (%u %s)", + bcsp->rx_skb->data[1] & 0x0f, + bcsp->rx_skb->data[0] & 0x80 ? + "reliable" : "unreliable"); + kfree_skb(bcsp->rx_skb); + } + } else + kfree_skb(bcsp->rx_skb); + } else if (pass_up == 1) { + /* Pull out BCSP hdr */ + skb_pull(bcsp->rx_skb, 4); + + hci_recv_frame(hu->hdev, bcsp->rx_skb); + } else { + /* ignore packet payload of already ACKed re-transmitted + * packets or when a packet was missed in the BCSP window + */ + kfree_skb(bcsp->rx_skb); + } + + bcsp->rx_state = BCSP_W4_PKT_DELIMITER; + bcsp->rx_skb = NULL; +} + +static u16 bscp_get_crc(struct bcsp_struct *bcsp) +{ + return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]); +} + +/* Recv data */ +static int bcsp_recv(struct hci_uart *hu, const void *data, int count) +{ + struct bcsp_struct *bcsp = hu->priv; + const unsigned char *ptr; + + BT_DBG("hu %p count %d rx_state %d rx_count %ld", + hu, count, bcsp->rx_state, bcsp->rx_count); + + ptr = data; + while (count) { + if (bcsp->rx_count) { + if (*ptr == 0xc0) { + BT_ERR("Short BCSP packet"); + kfree_skb(bcsp->rx_skb); + bcsp->rx_skb = NULL; + bcsp->rx_state = BCSP_W4_PKT_START; + bcsp->rx_count = 0; + } else + bcsp_unslip_one_byte(bcsp, *ptr); + + ptr++; count--; + continue; + } + + switch (bcsp->rx_state) { + case BCSP_W4_BCSP_HDR: + if ((0xff & (u8)~(bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] + + bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) { + BT_ERR("Error in BCSP hdr checksum"); + kfree_skb(bcsp->rx_skb); + bcsp->rx_skb = NULL; + bcsp->rx_state = BCSP_W4_PKT_DELIMITER; + bcsp->rx_count = 0; + continue; + } + bcsp->rx_state = BCSP_W4_DATA; + bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) + + (bcsp->rx_skb->data[2] << 4); /* May be 0 */ + continue; + + case BCSP_W4_DATA: + if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */ + bcsp->rx_state = BCSP_W4_CRC; + bcsp->rx_count = 2; + } else + bcsp_complete_rx_pkt(hu); + continue; + + case BCSP_W4_CRC: + if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) { + BT_ERR("Checksum failed: computed %04x received %04x", + bitrev16(bcsp->message_crc), + bscp_get_crc(bcsp)); + + kfree_skb(bcsp->rx_skb); + bcsp->rx_skb = NULL; + bcsp->rx_state = BCSP_W4_PKT_DELIMITER; + bcsp->rx_count = 0; + continue; + } + skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2); + bcsp_complete_rx_pkt(hu); + continue; + + case BCSP_W4_PKT_DELIMITER: + switch (*ptr) { + case 0xc0: + bcsp->rx_state = BCSP_W4_PKT_START; + break; + default: + /*BT_ERR("Ignoring byte %02x", *ptr);*/ + break; + } + ptr++; count--; + break; + + case BCSP_W4_PKT_START: + switch (*ptr) { + case 0xc0: + ptr++; count--; + break; + + default: + bcsp->rx_state = BCSP_W4_BCSP_HDR; + bcsp->rx_count = 4; + bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC; + BCSP_CRC_INIT(bcsp->message_crc); + + /* Do not increment ptr or decrement count + * Allocate packet. Max len of a BCSP pkt= + * 0xFFF (payload) +4 (header) +2 (crc) + */ + + bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC); + if (!bcsp->rx_skb) { + BT_ERR("Can't allocate mem for new packet"); + bcsp->rx_state = BCSP_W4_PKT_DELIMITER; + bcsp->rx_count = 0; + return 0; + } + break; + } + break; + } + } + return count; +} + + /* Arrange to retransmit all messages in the relq. */ +static void bcsp_timed_event(struct timer_list *t) +{ + struct bcsp_struct *bcsp = from_timer(bcsp, t, tbcsp); + struct hci_uart *hu = bcsp->hu; + struct sk_buff *skb; + unsigned long flags; + + BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen); + + spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING); + + while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) { + bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07; + skb_queue_head(&bcsp->rel, skb); + } + + spin_unlock_irqrestore(&bcsp->unack.lock, flags); + + hci_uart_tx_wakeup(hu); +} + +static int bcsp_open(struct hci_uart *hu) +{ + struct bcsp_struct *bcsp; + + BT_DBG("hu %p", hu); + + bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL); + if (!bcsp) + return -ENOMEM; + + hu->priv = bcsp; + bcsp->hu = hu; + skb_queue_head_init(&bcsp->unack); + skb_queue_head_init(&bcsp->rel); + skb_queue_head_init(&bcsp->unrel); + + timer_setup(&bcsp->tbcsp, bcsp_timed_event, 0); + + bcsp->rx_state = BCSP_W4_PKT_DELIMITER; + + if (txcrc) + bcsp->use_crc = 1; + + return 0; +} + +static int bcsp_close(struct hci_uart *hu) +{ + struct bcsp_struct *bcsp = hu->priv; + + timer_shutdown_sync(&bcsp->tbcsp); + + hu->priv = NULL; + + BT_DBG("hu %p", hu); + + skb_queue_purge(&bcsp->unack); + skb_queue_purge(&bcsp->rel); + skb_queue_purge(&bcsp->unrel); + + if (bcsp->rx_skb) { + kfree_skb(bcsp->rx_skb); + bcsp->rx_skb = NULL; + } + + kfree(bcsp); + return 0; +} + +static const struct hci_uart_proto bcsp = { + .id = HCI_UART_BCSP, + .name = "BCSP", + .open = bcsp_open, + .close = bcsp_close, + .enqueue = bcsp_enqueue, + .dequeue = bcsp_dequeue, + .recv = bcsp_recv, + .flush = bcsp_flush +}; + +int __init bcsp_init(void) +{ + return hci_uart_register_proto(&bcsp); +} + +int __exit bcsp_deinit(void) +{ + return hci_uart_unregister_proto(&bcsp); +} + +module_param(txcrc, bool, 0644); +MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet"); + +module_param(hciextn, bool, 0644); +MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets"); |