^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Bluetooth HCI UART driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2002-2003 Fabrizio Gennari <fabrizio.gennari@philips.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/bitrev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <net/bluetooth/bluetooth.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <net/bluetooth/hci_core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include "hci_uart.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static bool txcrc = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static bool hciextn = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define BCSP_TXWINSIZE 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define BCSP_ACK_PKT 0x05
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define BCSP_LE_PKT 0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct bcsp_struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct sk_buff_head unack; /* Unack'ed packets queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct sk_buff_head rel; /* Reliable packets queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct sk_buff_head unrel; /* Unreliable packets queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned long rx_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct sk_buff *rx_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) u8 rxseq_txack; /* rxseq == txack. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) u8 rxack; /* Last packet sent by us that the peer ack'ed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct timer_list tbcsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct hci_uart *hu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) BCSP_W4_PKT_DELIMITER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) BCSP_W4_PKT_START,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) BCSP_W4_BCSP_HDR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) BCSP_W4_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) BCSP_W4_CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) } rx_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) BCSP_ESCSTATE_NOESC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) BCSP_ESCSTATE_ESC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) } rx_esc_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) u8 use_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) u16 message_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) u8 txack_req; /* Do we need to send ack's to the peer? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* Reliable packet sequence number - used to assign seq to each rel pkt. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) u8 msgq_txseq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* ---- BCSP CRC calculation ---- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* Table for calculating CRC for polynomial 0x1021, LSB processed first,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * initial value 0xffff, bits shifted in reverse order.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static const u16 crc_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 0x0000, 0x1081, 0x2102, 0x3183,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 0x4204, 0x5285, 0x6306, 0x7387,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 0x8408, 0x9489, 0xa50a, 0xb58b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 0xc60c, 0xd68d, 0xe70e, 0xf78f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* Initialise the crc calculator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define BCSP_CRC_INIT(x) x = 0xffff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* Update crc with next data byte
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Implementation note
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * The data byte is treated as two nibbles. The crc is generated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * in reverse, i.e., bits are fed into the register from the top.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static void bcsp_crc_update(u16 *crc, u8 d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) u16 reg = *crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) reg = (reg >> 4) ^ crc_table[(reg ^ d) & 0x000f];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) reg = (reg >> 4) ^ crc_table[(reg ^ (d >> 4)) & 0x000f];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *crc = reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* ---- BCSP core ---- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static void bcsp_slip_msgdelim(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) const char pkt_delim = 0xc0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) skb_put_data(skb, &pkt_delim, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static void bcsp_slip_one_byte(struct sk_buff *skb, u8 c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) const char esc_c0[2] = { 0xdb, 0xdc };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) const char esc_db[2] = { 0xdb, 0xdd };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) switch (c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) case 0xc0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) skb_put_data(skb, &esc_c0, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) case 0xdb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) skb_put_data(skb, &esc_db, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) skb_put_data(skb, &c, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct bcsp_struct *bcsp = hu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (skb->len > 0xFFF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) BT_ERR("Packet too long");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) switch (hci_skb_pkt_type(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) case HCI_ACLDATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) case HCI_COMMAND_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) skb_queue_tail(&bcsp->rel, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) case HCI_SCODATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) skb_queue_tail(&bcsp->unrel, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) BT_ERR("Unknown packet type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static struct sk_buff *bcsp_prepare_pkt(struct bcsp_struct *bcsp, u8 *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) int len, int pkt_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct sk_buff *nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) u8 hdr[4], chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) u16 BCSP_CRC_INIT(bcsp_txmsg_crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int rel, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) switch (pkt_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) case HCI_ACLDATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) chan = 6; /* BCSP ACL channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) rel = 1; /* reliable channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) case HCI_COMMAND_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) chan = 5; /* BCSP cmd/evt channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) rel = 1; /* reliable channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) case HCI_SCODATA_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) chan = 7; /* BCSP SCO channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) rel = 0; /* unreliable channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) case BCSP_LE_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) chan = 1; /* BCSP LE channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) rel = 0; /* unreliable channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) case BCSP_ACK_PKT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) chan = 0; /* BCSP internal channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) rel = 0; /* unreliable channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) BT_ERR("Unknown packet type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if (hciextn && chan == 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) __le16 opcode = ((struct hci_command_hdr *)data)->opcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /* Vendor specific commands */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (hci_opcode_ogf(__le16_to_cpu(opcode)) == 0x3f) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) u8 desc = *(data + HCI_COMMAND_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if ((desc & 0xf0) == 0xc0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) data += HCI_COMMAND_HDR_SIZE + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) len -= HCI_COMMAND_HDR_SIZE + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) chan = desc & 0x0f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /* Max len of packet: (original len +4(bcsp hdr) +2(crc))*2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * (because bytes 0xc0 and 0xdb are escaped, worst case is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * when the packet is all made of 0xc0 and 0xdb :) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * + 2 (0xc0 delimiters at start and end).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) nskb = alloc_skb((len + 6) * 2 + 2, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (!nskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) hci_skb_pkt_type(nskb) = pkt_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) bcsp_slip_msgdelim(nskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) hdr[0] = bcsp->rxseq_txack << 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) bcsp->txack_req = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) BT_DBG("We request packet no %u to card", bcsp->rxseq_txack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (rel) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) hdr[0] |= 0x80 + bcsp->msgq_txseq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) BT_DBG("Sending packet with seqno %u", bcsp->msgq_txseq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) bcsp->msgq_txseq = (bcsp->msgq_txseq + 1) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (bcsp->use_crc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) hdr[0] |= 0x40;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) hdr[1] = ((len << 4) & 0xff) | chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) hdr[2] = len >> 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) hdr[3] = ~(hdr[0] + hdr[1] + hdr[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /* Put BCSP header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) for (i = 0; i < 4; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) bcsp_slip_one_byte(nskb, hdr[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (bcsp->use_crc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) bcsp_crc_update(&bcsp_txmsg_crc, hdr[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /* Put payload */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) for (i = 0; i < len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) bcsp_slip_one_byte(nskb, data[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (bcsp->use_crc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) bcsp_crc_update(&bcsp_txmsg_crc, data[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /* Put CRC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (bcsp->use_crc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) bcsp_txmsg_crc = bitrev16(bcsp_txmsg_crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) bcsp_slip_one_byte(nskb, (u8)((bcsp_txmsg_crc >> 8) & 0x00ff));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) bcsp_slip_one_byte(nskb, (u8)(bcsp_txmsg_crc & 0x00ff));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) bcsp_slip_msgdelim(nskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* This is a rewrite of pkt_avail in ABCSP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static struct sk_buff *bcsp_dequeue(struct hci_uart *hu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) struct bcsp_struct *bcsp = hu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) /* First of all, check for unreliable messages in the queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * since they have priority
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) skb = skb_dequeue(&bcsp->unrel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (skb != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct sk_buff *nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) hci_skb_pkt_type(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (nskb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) skb_queue_head(&bcsp->unrel, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) BT_ERR("Could not dequeue pkt because alloc_skb failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) /* Now, try to send a reliable pkt. We can only send a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * reliable packet if the number of packets sent but not yet ack'ed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * is < than the winsize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (bcsp->unack.qlen < BCSP_TXWINSIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) skb = skb_dequeue(&bcsp->rel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (skb != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct sk_buff *nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) nskb = bcsp_prepare_pkt(bcsp, skb->data, skb->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) hci_skb_pkt_type(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (nskb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) __skb_queue_tail(&bcsp->unack, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) mod_timer(&bcsp->tbcsp, jiffies + HZ / 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) spin_unlock_irqrestore(&bcsp->unack.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) skb_queue_head(&bcsp->rel, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) BT_ERR("Could not dequeue pkt because alloc_skb failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) spin_unlock_irqrestore(&bcsp->unack.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /* We could not send a reliable packet, either because there are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * none or because there are too many unack'ed pkts. Did we receive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * any packets we have not acknowledged yet ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (bcsp->txack_req) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) /* if so, craft an empty ACK pkt and send it on BCSP unreliable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * channel 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) struct sk_buff *nskb = bcsp_prepare_pkt(bcsp, NULL, 0, BCSP_ACK_PKT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /* We have nothing to send */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) static int bcsp_flush(struct hci_uart *hu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) BT_DBG("hu %p", hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /* Remove ack'ed packets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static void bcsp_pkt_cull(struct bcsp_struct *bcsp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) struct sk_buff *skb, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) int i, pkts_to_be_removed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) u8 seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) spin_lock_irqsave(&bcsp->unack.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) pkts_to_be_removed = skb_queue_len(&bcsp->unack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) seqno = bcsp->msgq_txseq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) while (pkts_to_be_removed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (bcsp->rxack == seqno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) pkts_to_be_removed--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) seqno = (seqno - 1) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (bcsp->rxack != seqno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) BT_ERR("Peer acked invalid packet");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) BT_DBG("Removing %u pkts out of %u, up to seqno %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) pkts_to_be_removed, skb_queue_len(&bcsp->unack),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) (seqno - 1) & 0x07);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) skb_queue_walk_safe(&bcsp->unack, skb, tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) if (i >= pkts_to_be_removed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) __skb_unlink(skb, &bcsp->unack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (skb_queue_empty(&bcsp->unack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) del_timer(&bcsp->tbcsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) spin_unlock_irqrestore(&bcsp->unack.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (i != pkts_to_be_removed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) BT_ERR("Removed only %u out of %u pkts", i, pkts_to_be_removed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) /* Handle BCSP link-establishment packets. When we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) * detect a "sync" packet, symptom that the BT module has reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) * we do nothing :) (yet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static void bcsp_handle_le_pkt(struct hci_uart *hu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct bcsp_struct *bcsp = hu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) u8 conf_pkt[4] = { 0xad, 0xef, 0xac, 0xed };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) u8 conf_rsp_pkt[4] = { 0xde, 0xad, 0xd0, 0xd0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) u8 sync_pkt[4] = { 0xda, 0xdc, 0xed, 0xed };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) /* spot "conf" pkts and reply with a "conf rsp" pkt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) !memcmp(&bcsp->rx_skb->data[4], conf_pkt, 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct sk_buff *nskb = alloc_skb(4, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) BT_DBG("Found a LE conf pkt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (!nskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) skb_put_data(nskb, conf_rsp_pkt, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) hci_skb_pkt_type(nskb) = BCSP_LE_PKT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) skb_queue_head(&bcsp->unrel, nskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) hci_uart_tx_wakeup(hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* Spot "sync" pkts. If we find one...disaster! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) else if (bcsp->rx_skb->data[1] >> 4 == 4 && bcsp->rx_skb->data[2] == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) !memcmp(&bcsp->rx_skb->data[4], sync_pkt, 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) BT_ERR("Found a LE sync pkt, card has reset");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) static inline void bcsp_unslip_one_byte(struct bcsp_struct *bcsp, unsigned char byte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) const u8 c0 = 0xc0, db = 0xdb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) switch (bcsp->rx_esc_state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) case BCSP_ESCSTATE_NOESC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) switch (byte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) case 0xdb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) bcsp->rx_esc_state = BCSP_ESCSTATE_ESC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) skb_put_data(bcsp->rx_skb, &byte, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if ((bcsp->rx_skb->data[0] & 0x40) != 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) bcsp->rx_state != BCSP_W4_CRC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) bcsp_crc_update(&bcsp->message_crc, byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) bcsp->rx_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) case BCSP_ESCSTATE_ESC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) switch (byte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) case 0xdc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) skb_put_data(bcsp->rx_skb, &c0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if ((bcsp->rx_skb->data[0] & 0x40) != 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) bcsp->rx_state != BCSP_W4_CRC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) bcsp_crc_update(&bcsp->message_crc, 0xc0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) bcsp->rx_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) case 0xdd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) skb_put_data(bcsp->rx_skb, &db, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if ((bcsp->rx_skb->data[0] & 0x40) != 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) bcsp->rx_state != BCSP_W4_CRC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) bcsp_crc_update(&bcsp->message_crc, 0xdb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) bcsp->rx_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) BT_ERR("Invalid byte %02x after esc byte", byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) bcsp->rx_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) bcsp->rx_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) static void bcsp_complete_rx_pkt(struct hci_uart *hu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) struct bcsp_struct *bcsp = hu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) int pass_up = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (bcsp->rx_skb->data[0] & 0x80) { /* reliable pkt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) BT_DBG("Received seqno %u from card", bcsp->rxseq_txack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) /* check the rx sequence number is as expected */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if ((bcsp->rx_skb->data[0] & 0x07) == bcsp->rxseq_txack) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) bcsp->rxseq_txack++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) bcsp->rxseq_txack %= 0x8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) /* handle re-transmitted packet or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * when packet was missed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) BT_ERR("Out-of-order packet arrived, got %u expected %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) bcsp->rx_skb->data[0] & 0x07, bcsp->rxseq_txack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) /* do not process out-of-order packet payload */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) pass_up = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) /* send current txack value to all received reliable packets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) bcsp->txack_req = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) /* If needed, transmit an ack pkt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) hci_uart_tx_wakeup(hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) bcsp->rxack = (bcsp->rx_skb->data[0] >> 3) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) BT_DBG("Request for pkt %u from card", bcsp->rxack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) /* handle received ACK indications,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * including those from out-of-order packets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) bcsp_pkt_cull(bcsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (pass_up != 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if ((bcsp->rx_skb->data[1] & 0x0f) == 6 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) (bcsp->rx_skb->data[0] & 0x80)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) hci_skb_pkt_type(bcsp->rx_skb) = HCI_ACLDATA_PKT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) pass_up = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) } else if ((bcsp->rx_skb->data[1] & 0x0f) == 5 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) (bcsp->rx_skb->data[0] & 0x80)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) pass_up = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) } else if ((bcsp->rx_skb->data[1] & 0x0f) == 7) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) hci_skb_pkt_type(bcsp->rx_skb) = HCI_SCODATA_PKT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) pass_up = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) } else if ((bcsp->rx_skb->data[1] & 0x0f) == 1 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) !(bcsp->rx_skb->data[0] & 0x80)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) bcsp_handle_le_pkt(hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) pass_up = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) pass_up = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (pass_up == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) struct hci_event_hdr hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) u8 desc = (bcsp->rx_skb->data[1] & 0x0f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (desc != 0 && desc != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (hciextn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) desc |= 0xc0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) skb_pull(bcsp->rx_skb, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) memcpy(skb_push(bcsp->rx_skb, 1), &desc, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) hdr.evt = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) hdr.plen = bcsp->rx_skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) memcpy(skb_push(bcsp->rx_skb, HCI_EVENT_HDR_SIZE), &hdr, HCI_EVENT_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) hci_skb_pkt_type(bcsp->rx_skb) = HCI_EVENT_PKT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) hci_recv_frame(hu->hdev, bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) BT_ERR("Packet for unknown channel (%u %s)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) bcsp->rx_skb->data[1] & 0x0f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) bcsp->rx_skb->data[0] & 0x80 ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) "reliable" : "unreliable");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) } else if (pass_up == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) /* Pull out BCSP hdr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) skb_pull(bcsp->rx_skb, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) hci_recv_frame(hu->hdev, bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) /* ignore packet payload of already ACKed re-transmitted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) * packets or when a packet was missed in the BCSP window
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) bcsp->rx_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) static u16 bscp_get_crc(struct bcsp_struct *bcsp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) return get_unaligned_be16(&bcsp->rx_skb->data[bcsp->rx_skb->len - 2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) /* Recv data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) static int bcsp_recv(struct hci_uart *hu, const void *data, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) struct bcsp_struct *bcsp = hu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) const unsigned char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) BT_DBG("hu %p count %d rx_state %d rx_count %ld",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) hu, count, bcsp->rx_state, bcsp->rx_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) ptr = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) while (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) if (bcsp->rx_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (*ptr == 0xc0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) BT_ERR("Short BCSP packet");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) bcsp->rx_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) bcsp->rx_state = BCSP_W4_PKT_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) bcsp->rx_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) bcsp_unslip_one_byte(bcsp, *ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) ptr++; count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) switch (bcsp->rx_state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) case BCSP_W4_BCSP_HDR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) if ((0xff & (u8)~(bcsp->rx_skb->data[0] + bcsp->rx_skb->data[1] +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) bcsp->rx_skb->data[2])) != bcsp->rx_skb->data[3]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) BT_ERR("Error in BCSP hdr checksum");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) bcsp->rx_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) bcsp->rx_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) bcsp->rx_state = BCSP_W4_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) bcsp->rx_count = (bcsp->rx_skb->data[1] >> 4) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) (bcsp->rx_skb->data[2] << 4); /* May be 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) case BCSP_W4_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) if (bcsp->rx_skb->data[0] & 0x40) { /* pkt with crc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) bcsp->rx_state = BCSP_W4_CRC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) bcsp->rx_count = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) bcsp_complete_rx_pkt(hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) case BCSP_W4_CRC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) if (bitrev16(bcsp->message_crc) != bscp_get_crc(bcsp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) BT_ERR("Checksum failed: computed %04x received %04x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) bitrev16(bcsp->message_crc),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) bscp_get_crc(bcsp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) bcsp->rx_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) bcsp->rx_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) skb_trim(bcsp->rx_skb, bcsp->rx_skb->len - 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) bcsp_complete_rx_pkt(hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) case BCSP_W4_PKT_DELIMITER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) switch (*ptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) case 0xc0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) bcsp->rx_state = BCSP_W4_PKT_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) /*BT_ERR("Ignoring byte %02x", *ptr);*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) ptr++; count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) case BCSP_W4_PKT_START:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) switch (*ptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) case 0xc0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) ptr++; count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) bcsp->rx_state = BCSP_W4_BCSP_HDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) bcsp->rx_count = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) bcsp->rx_esc_state = BCSP_ESCSTATE_NOESC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) BCSP_CRC_INIT(bcsp->message_crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) /* Do not increment ptr or decrement count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) * Allocate packet. Max len of a BCSP pkt=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) * 0xFFF (payload) +4 (header) +2 (crc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) bcsp->rx_skb = bt_skb_alloc(0x1005, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) if (!bcsp->rx_skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) BT_ERR("Can't allocate mem for new packet");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) bcsp->rx_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) /* Arrange to retransmit all messages in the relq. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) static void bcsp_timed_event(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) struct bcsp_struct *bcsp = from_timer(bcsp, t, tbcsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) struct hci_uart *hu = bcsp->hu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) BT_DBG("hu %p retransmitting %u pkts", hu, bcsp->unack.qlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) spin_lock_irqsave_nested(&bcsp->unack.lock, flags, SINGLE_DEPTH_NESTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) while ((skb = __skb_dequeue_tail(&bcsp->unack)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) bcsp->msgq_txseq = (bcsp->msgq_txseq - 1) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) skb_queue_head(&bcsp->rel, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) spin_unlock_irqrestore(&bcsp->unack.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) hci_uart_tx_wakeup(hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) static int bcsp_open(struct hci_uart *hu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) struct bcsp_struct *bcsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) BT_DBG("hu %p", hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) bcsp = kzalloc(sizeof(*bcsp), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) if (!bcsp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) hu->priv = bcsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) bcsp->hu = hu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) skb_queue_head_init(&bcsp->unack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) skb_queue_head_init(&bcsp->rel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) skb_queue_head_init(&bcsp->unrel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) timer_setup(&bcsp->tbcsp, bcsp_timed_event, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) bcsp->rx_state = BCSP_W4_PKT_DELIMITER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) if (txcrc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) bcsp->use_crc = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) static int bcsp_close(struct hci_uart *hu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) struct bcsp_struct *bcsp = hu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) del_timer_sync(&bcsp->tbcsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) hu->priv = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) BT_DBG("hu %p", hu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) skb_queue_purge(&bcsp->unack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) skb_queue_purge(&bcsp->rel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) skb_queue_purge(&bcsp->unrel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) if (bcsp->rx_skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) kfree_skb(bcsp->rx_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) bcsp->rx_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) kfree(bcsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) static const struct hci_uart_proto bcsp = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) .id = HCI_UART_BCSP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) .name = "BCSP",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) .open = bcsp_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) .close = bcsp_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) .enqueue = bcsp_enqueue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) .dequeue = bcsp_dequeue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) .recv = bcsp_recv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) .flush = bcsp_flush
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) int __init bcsp_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) return hci_uart_register_proto(&bcsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) int __exit bcsp_deinit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) return hci_uart_unregister_proto(&bcsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) module_param(txcrc, bool, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) MODULE_PARM_DESC(txcrc, "Transmit CRC with every BCSP packet");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) module_param(hciextn, bool, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) MODULE_PARM_DESC(hciextn, "Convert HCI Extensions into BCSP packets");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags