btstack/src/hci.c

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/*
* Copyright (C) 2009 by Matthias Ringwald
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
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/*
* hci.c
*
* Created by Matthias Ringwald on 4/29/09.
*
*/
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#include "hci.h"
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#include <unistd.h>
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#include <stdarg.h>
#include <string.h>
#include <stdio.h>
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#include "debug.h"
#include "hci_dump.h"
#include "../include/btstack/hci_cmds.h"
#include "../include/btstack/version.h"
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// temp
#include "l2cap.h"
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#define HCI_CONNECTION_TIMEOUT_MS 10000
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// the STACK is here
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static hci_stack_t hci_stack;
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/**
* get connection for a given handle
*
* @return connection OR NULL, if not found
*/
hci_connection_t * connection_for_handle(hci_con_handle_t con_handle){
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linked_item_t *it;
for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){
if ( ((hci_connection_t *) it)->con_handle == con_handle){
return (hci_connection_t *) it;
}
}
return NULL;
}
static void hci_connection_timeout_handler(timer_source_t *timer){
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hci_connection_t * connection = linked_item_get_user(&timer->item);
struct timeval tv;
gettimeofday(&tv, NULL);
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if (tv.tv_sec >= connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000) {
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// connections might be timed out
hci_emit_l2cap_check_timeout(connection);
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run_loop_set_timer(timer, HCI_CONNECTION_TIMEOUT_MS);
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} else {
// next timeout check at
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timer->timeout.tv_sec = connection->timestamp.tv_sec + HCI_CONNECTION_TIMEOUT_MS/1000;
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}
run_loop_add_timer(timer);
}
static void hci_connection_timestamp(hci_connection_t *connection){
gettimeofday(&connection->timestamp, NULL);
}
/**
* create connection for given address
*
* @return connection OR NULL, if not found
*/
static hci_connection_t * create_connection_for_addr(bd_addr_t addr){
hci_connection_t * conn = malloc( sizeof(hci_connection_t) );
if (!conn) return NULL;
BD_ADDR_COPY(conn->address, addr);
conn->con_handle = 0xffff;
conn->authentication_flags = 0;
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linked_item_set_user(&conn->timeout.item, conn);
conn->timeout.process = hci_connection_timeout_handler;
hci_connection_timestamp(conn);
conn->acl_recombination_length = 0;
conn->acl_recombination_pos = 0;
conn->num_acl_packets_sent = 0;
linked_list_add(&hci_stack.connections, (linked_item_t *) conn);
return conn;
}
/**
* get connection for given address
*
* @return connection OR NULL, if not found
*/
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static hci_connection_t * connection_for_address(bd_addr_t address){
linked_item_t *it;
for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){
if ( ! BD_ADDR_CMP( ((hci_connection_t *) it)->address, address) ){
return (hci_connection_t *) it;
}
}
return NULL;
}
/**
* add authentication flags and reset timer
*/
static void hci_add_connection_flags_for_flipped_bd_addr(uint8_t *bd_addr, hci_authentication_flags_t flags){
bd_addr_t addr;
bt_flip_addr(addr, *(bd_addr_t *) bd_addr);
hci_connection_t * conn = connection_for_address(addr);
if (conn) {
conn->authentication_flags |= flags;
hci_connection_timestamp(conn);
}
}
int hci_authentication_active_for_handle(hci_con_handle_t handle){
hci_connection_t * conn = connection_for_handle(handle);
if (!conn) return 0;
if (!conn->authentication_flags) return 0;
if (conn->authentication_flags & SENT_LINK_KEY_REPLY) return 0;
if (conn->authentication_flags & RECV_LINK_KEY_NOTIFICATION) return 0;
return 1;
}
void hci_drop_link_key_for_bd_addr(bd_addr_t *addr){
if (hci_stack.remote_device_db) {
hci_stack.remote_device_db->delete_link_key(addr);
}
}
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/**
* count connections
*/
static int nr_hci_connections(){
int count = 0;
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linked_item_t *it;
for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next, count++);
return count;
}
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/**
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* Dummy handler called by HCI
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*/
static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){
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}
uint8_t hci_number_outgoing_packets(hci_con_handle_t handle){
hci_connection_t * connection = connection_for_handle(handle);
if (!connection) {
log_err("hci_number_outgoing_packets connectino for handle %u does not exist!\n", handle);
return 0;
}
return connection->num_acl_packets_sent;
}
uint8_t hci_number_free_acl_slots(){
uint8_t free_slots = hci_stack.total_num_acl_packets;
linked_item_t *it;
for (it = (linked_item_t *) hci_stack.connections; it ; it = it->next){
hci_connection_t * connection = (hci_connection_t *) it;
if (free_slots < connection->num_acl_packets_sent) {
log_err("hci_number_free_acl_slots: sum of outgoing packets > total acl packets!\n");
return 0;
}
free_slots -= connection->num_acl_packets_sent;
}
return free_slots;
}
uint16_t hci_max_acl_data_packet_length(){
return hci_stack.acl_data_packet_length;
}
int hci_ready_to_send(hci_con_handle_t handle){
return hci_number_free_acl_slots() && hci_number_outgoing_packets(handle) < 2;
}
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int hci_send_acl_packet(uint8_t *packet, int size){
// check for free places on BT module
if (!hci_number_free_acl_slots()) return -1;
hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet);
hci_connection_t *connection = connection_for_handle( con_handle);
if (!connection) return 0;
hci_connection_timestamp(connection);
// count packet
connection->num_acl_packets_sent++;
// log_dbg("hci_send_acl_packet - handle %u, sent %u\n", connection->con_handle, connection->num_acl_packets_sent);
// send packet - ignore errors
hci_stack.hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size);
return 0;
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}
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static void acl_handler(uint8_t *packet, int size){
// get info
hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet);
hci_connection_t *conn = connection_for_handle(con_handle);
uint8_t acl_flags = READ_ACL_FLAGS(packet);
uint16_t acl_length = READ_ACL_LENGTH(packet);
// ignore non-registered handle
if (!conn){
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log_err( "hci.c: acl_handler called with non-registered handle %u!\n" , con_handle);
return;
}
// update idle timestamp
hci_connection_timestamp(conn);
// handle different packet types
switch (acl_flags & 0x03) {
case 0x01: // continuation fragment
// sanity check
if (conn->acl_recombination_pos == 0) {
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log_err( "ACL Cont Fragment but no first fragment for handle 0x%02x\n", con_handle);
return;
}
// append fragment payload (header already stored)
memcpy(&conn->acl_recombination_buffer[conn->acl_recombination_pos], &packet[4], acl_length );
conn->acl_recombination_pos += acl_length;
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// log_err( "ACL Cont Fragment: acl_len %u, combined_len %u, l2cap_len %u\n",
// acl_length, connection->acl_recombination_pos, connection->acl_recombination_length);
// forward complete L2CAP packet if complete.
if (conn->acl_recombination_pos >= conn->acl_recombination_length + 4 + 4){ // pos already incl. ACL header
hci_stack.packet_handler(HCI_ACL_DATA_PACKET, conn->acl_recombination_buffer, conn->acl_recombination_pos);
// reset recombination buffer
conn->acl_recombination_length = 0;
conn->acl_recombination_pos = 0;
}
break;
case 0x02: { // first fragment
// sanity check
if (conn->acl_recombination_pos) {
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log_err( "ACL First Fragment but data in buffer for handle 0x%02x\n", con_handle);
return;
}
// peek into L2CAP packet!
uint16_t l2cap_length = READ_L2CAP_LENGTH( packet );
// compare fragment size to L2CAP packet size
if (acl_length >= l2cap_length + 4){
// forward fragment as L2CAP packet
hci_stack.packet_handler(HCI_ACL_DATA_PACKET, packet, acl_length + 4);
} else {
// store first fragment and tweak acl length for complete package
memcpy(conn->acl_recombination_buffer, packet, acl_length + 4);
conn->acl_recombination_pos = acl_length + 4;
conn->acl_recombination_length = l2cap_length;
bt_store_16(conn->acl_recombination_buffer, 2, acl_length +4);
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// log_err( "ACL First Fragment: acl_len %u, l2cap_len %u\n", acl_length, l2cap_length);
}
break;
}
default:
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log_err( "hci.c: acl_handler called with invalid packet boundary flags %u\n", acl_flags & 0x03);
return;
}
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// execute main loop
hci_run();
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}
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static void hci_shutdown_connection(hci_connection_t *conn){
log_dbg("Connection closed: handle %u, ", conn->con_handle);
print_bd_addr( conn->address );
log_dbg("\n");
run_loop_remove_timer(&conn->timeout);
linked_list_remove(&hci_stack.connections, (linked_item_t *) conn);
free( conn );
hci_emit_nr_connections_changed();
}
// avoid huge local variables
static device_name_t device_name;
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static void event_handler(uint8_t *packet, int size){
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bd_addr_t addr;
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hci_con_handle_t handle;
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hci_connection_t * conn;
int i;
link_key_t link_key;
switch (packet[0]) {
case HCI_EVENT_COMMAND_COMPLETE:
// get num cmd packets
// log_dbg("HCI_EVENT_COMMAND_COMPLETE cmds old %u - new %u\n", hci_stack.num_cmd_packets, packet[2]);
hci_stack.num_cmd_packets = packet[2];
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if (COMMAND_COMPLETE_EVENT(packet, hci_read_buffer_size)){
// from offset 5
// status
hci_stack.acl_data_packet_length = READ_BT_16(packet, 6);
// ignore: SCO data packet len (8)
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hci_stack.total_num_acl_packets = packet[9];
// ignore: total num SCO packets
if (hci_stack.state == HCI_STATE_INITIALIZING){
log_dbg("hci_read_buffer_size: size %u, count %u\n", hci_stack.acl_data_packet_length, hci_stack.total_num_acl_packets);
}
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}
if (COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){
hci_emit_discoverable_enabled(hci_stack.discoverable);
}
break;
case HCI_EVENT_COMMAND_STATUS:
// get num cmd packets
// log_dbg("HCI_EVENT_COMMAND_STATUS cmds - old %u - new %u\n", hci_stack.num_cmd_packets, packet[3]);
hci_stack.num_cmd_packets = packet[3];
break;
case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:
for (i=0; i<packet[2];i++){
handle = READ_BT_16(packet, 3 + 2*i);
uint16_t num_packets = READ_BT_16(packet, 3 + packet[2]*2 + 2*i);
conn = connection_for_handle(handle);
if (!conn){
log_err("hci_number_completed_packet lists unused con handle %u\n", handle);
continue;
}
conn->num_acl_packets_sent -= num_packets;
// log_dbg("hci_number_completed_packet %u processed for handle %u, outstanding %u\n", num_packets, handle, conn->num_acl_packets_sent);
}
break;
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case HCI_EVENT_CONNECTION_REQUEST:
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bt_flip_addr(addr, &packet[2]);
// TODO: eval COD 8-10
uint8_t link_type = packet[11];
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log_dbg("Connection_incoming: "); print_bd_addr(addr); log_dbg(", type %u\n", link_type);
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if (link_type == 1) { // ACL
conn = connection_for_address(addr);
if (!conn) {
conn = create_connection_for_addr(addr);
}
// TODO: check for malloc failure
conn->state = ACCEPTED_CONNECTION_REQUEST;
hci_send_cmd(&hci_accept_connection_request, addr, 1);
} else {
// TODO: decline request
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}
break;
case HCI_EVENT_CONNECTION_COMPLETE:
// Connection management
bt_flip_addr(addr, &packet[5]);
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log_dbg("Connection_complete (status=%u)", packet[2]); print_bd_addr(addr); log_dbg("\n");
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conn = connection_for_address(addr);
if (conn) {
if (!packet[2]){
conn->state = OPEN;
conn->con_handle = READ_BT_16(packet, 3);
gettimeofday(&conn->timestamp, NULL);
run_loop_set_timer(&conn->timeout, HCI_CONNECTION_TIMEOUT_MS);
run_loop_add_timer(&conn->timeout);
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log_dbg("New connection: handle %u, ", conn->con_handle);
print_bd_addr( conn->address );
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log_dbg("\n");
hci_emit_nr_connections_changed();
} else {
// connection failed, remove entry
linked_list_remove(&hci_stack.connections, (linked_item_t *) conn);
free( conn );
// if authentication error, also delete link key
if (packet[2] == 0x05) {
hci_drop_link_key_for_bd_addr(&addr);
}
}
}
break;
case HCI_EVENT_LINK_KEY_REQUEST:
hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_REQUEST);
if (!hci_stack.remote_device_db) break;
bt_flip_addr(addr, &packet[2]);
if ( hci_stack.remote_device_db->get_link_key( &addr, &link_key)){
hci_send_cmd(&hci_link_key_request_reply, &addr, &link_key);
} else {
hci_send_cmd(&hci_link_key_request_negative_reply, &addr);
}
// request already answered
return;
case HCI_EVENT_LINK_KEY_NOTIFICATION:
hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_LINK_KEY_NOTIFICATION);
if (!hci_stack.remote_device_db) break;
bt_flip_addr(addr, &packet[2]);
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hci_stack.remote_device_db->put_link_key(&addr, (link_key_t *) &packet[8]);
// still forward event to allow dismiss of pairing dialog
break;
case HCI_EVENT_PIN_CODE_REQUEST:
hci_add_connection_flags_for_flipped_bd_addr(&packet[2], RECV_PIN_CODE_REQUEST);
break;
case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE:
if (!hci_stack.remote_device_db) break;
if (packet[2]) break; // status not ok
bt_flip_addr(addr, &packet[3]);
bzero(&device_name, sizeof(device_name_t));
strncpy((char*) device_name, (char*) &packet[9], 248);
hci_stack.remote_device_db->put_name(&addr, &device_name);
break;
case HCI_EVENT_INQUIRY_RESULT:
case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:
if (!hci_stack.remote_device_db) break;
// first send inq result packet
hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size);
// then send cached remote names
for (i=0; i<packet[2];i++){
bt_flip_addr(addr, &packet[3+i*6]);
if (hci_stack.remote_device_db->get_name(&addr, &device_name)){
hci_emit_remote_name_cached(&addr, &device_name);
}
}
return;
case HCI_EVENT_DISCONNECTION_COMPLETE:
if (!packet[2]){
handle = READ_BT_16(packet, 3);
hci_connection_t * conn = connection_for_handle(handle);
if (conn) {
hci_shutdown_connection(conn);
}
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}
break;
default:
break;
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}
// handle BT initialization
if (hci_stack.state == HCI_STATE_INITIALIZING){
// handle H4 synchronization loss on restart
// if (hci_stack.substate == 1 && packet[0] == HCI_EVENT_HARDWARE_ERROR){
// hci_stack.substate = 0;
// }
// handle normal init sequence
if (hci_stack.substate % 2){
// odd: waiting for event
if (packet[0] == HCI_EVENT_COMMAND_COMPLETE){
hci_stack.substate++;
}
}
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}
// help with BT sleep
if (hci_stack.state == HCI_STATE_FALLING_ASLEEP
&& hci_stack.substate == 1
&& COMMAND_COMPLETE_EVENT(packet, hci_write_scan_enable)){
hci_stack.substate++;
}
hci_stack.packet_handler(HCI_EVENT_PACKET, packet, size);
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// execute main loop
hci_run();
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}
void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){
switch (packet_type) {
case HCI_EVENT_PACKET:
event_handler(packet, size);
break;
case HCI_ACL_DATA_PACKET:
acl_handler(packet, size);
break;
default:
break;
}
}
/** Register HCI packet handlers */
void hci_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){
hci_stack.packet_handler = handler;
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}
void hci_init(hci_transport_t *transport, void *config, bt_control_t *control, remote_device_db_t * remote_device_db){
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// reference to use transport layer implementation
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hci_stack.hci_transport = transport;
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// references to used control implementation
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hci_stack.control = control;
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// reference to used config
hci_stack.config = config;
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// no connections yet
hci_stack.connections = NULL;
// empty cmd buffer
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hci_stack.hci_cmd_buffer = malloc(3+255);
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// higher level handler
hci_stack.packet_handler = dummy_handler;
// store and open remote device db
hci_stack.remote_device_db = remote_device_db;
if (hci_stack.remote_device_db) {
hci_stack.remote_device_db->open();
}
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// register packet handlers with transport
transport->register_packet_handler(&packet_handler);
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}
void hci_close(){
// close remote device db
if (hci_stack.remote_device_db) {
hci_stack.remote_device_db->close();
}
}
// State-Module-Driver overview
// state module low-level
// HCI_STATE_OFF off close
// HCI_STATE_INITIALIZING, on open
// HCI_STATE_WORKING, on open
// HCI_STATE_HALTING, on open
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// HCI_STATE_SLEEPING, off/sleep close
// HCI_STATE_FALLING_ASLEEP on open
static int hci_power_control_on(){
// power on
int err = 0;
if (hci_stack.control && hci_stack.control->on){
err = (*hci_stack.control->on)(hci_stack.config);
}
if (err){
log_err( "POWER_ON failed\n");
hci_emit_hci_open_failed();
return err;
}
// open low-level device
err = hci_stack.hci_transport->open(hci_stack.config);
if (err){
log_err( "HCI_INIT failed, turning Bluetooth off again\n");
if (hci_stack.control && hci_stack.control->off){
(*hci_stack.control->off)(hci_stack.config);
}
hci_emit_hci_open_failed();
return err;
}
return 0;
}
static void hci_power_control_off(){
// close low-level device
hci_stack.hci_transport->close(hci_stack.config);
// power off
if (hci_stack.control && hci_stack.control->off){
(*hci_stack.control->off)(hci_stack.config);
}
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hci_stack.state = HCI_STATE_OFF;
}
static void hci_power_control_sleep(){
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log_dbg("hci_power_control_sleep");
#if 0
// don't close serial port during sleep
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// close low-level device
hci_stack.hci_transport->close(hci_stack.config);
#endif
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// sleep mode
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if (hci_stack.control && hci_stack.control->sleep){
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(*hci_stack.control->sleep)(hci_stack.config);
}
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hci_stack.state = HCI_STATE_SLEEPING;
}
static int hci_power_control_wake(){
log_dbg("hci_power_control_wake");
// wake on
if (hci_stack.control && hci_stack.control->wake){
(*hci_stack.control->wake)(hci_stack.config);
}
#if 0
// open low-level device
int err = hci_stack.hci_transport->open(hci_stack.config);
if (err){
log_err( "HCI_INIT failed, turning Bluetooth off again\n");
if (hci_stack.control && hci_stack.control->off){
(*hci_stack.control->off)(hci_stack.config);
}
hci_emit_hci_open_failed();
return err;
}
#endif
return 0;
}
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int hci_power_control(HCI_POWER_MODE power_mode){
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log_dbg("hci_power_control: %u, current mode %u\n", power_mode, hci_stack.state);
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int err = 0;
switch (hci_stack.state){
case HCI_STATE_OFF:
switch (power_mode){
case HCI_POWER_ON:
err = hci_power_control_on();
if (err) return err;
// set up state machine
hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent
hci_stack.state = HCI_STATE_INITIALIZING;
hci_stack.substate = 0;
break;
case HCI_POWER_OFF:
// do nothing
break;
case HCI_POWER_SLEEP:
// do nothing (with SLEEP == OFF)
break;
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}
break;
case HCI_STATE_INITIALIZING:
switch (power_mode){
case HCI_POWER_ON:
// do nothing
break;
case HCI_POWER_OFF:
// no connections yet, just turn it off
hci_power_control_off();
break;
case HCI_POWER_SLEEP:
// no connections yet, just turn it off
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hci_power_control_sleep();
break;
}
break;
case HCI_STATE_WORKING:
switch (power_mode){
case HCI_POWER_ON:
// do nothing
break;
case HCI_POWER_OFF:
// see hci_run
hci_stack.state = HCI_STATE_HALTING;
break;
case HCI_POWER_SLEEP:
// see hci_run
hci_stack.state = HCI_STATE_FALLING_ASLEEP;
hci_stack.substate = 0;
break;
}
break;
case HCI_STATE_HALTING:
switch (power_mode){
case HCI_POWER_ON:
// set up state machine
hci_stack.state = HCI_STATE_INITIALIZING;
hci_stack.substate = 0;
break;
case HCI_POWER_OFF:
// do nothing
break;
case HCI_POWER_SLEEP:
// see hci_run
hci_stack.state = HCI_STATE_FALLING_ASLEEP;
hci_stack.substate = 0;
break;
}
break;
case HCI_STATE_FALLING_ASLEEP:
switch (power_mode){
case HCI_POWER_ON:
// set up state machine
hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent
hci_stack.state = HCI_STATE_INITIALIZING;
hci_stack.substate = 0;
break;
case HCI_POWER_OFF:
// see hci_run
hci_stack.state = HCI_STATE_HALTING;
break;
case HCI_POWER_SLEEP:
// do nothing
break;
}
break;
case HCI_STATE_SLEEPING:
switch (power_mode){
case HCI_POWER_ON:
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err = hci_power_control_wake();
if (err) return err;
// set up state machine
hci_stack.num_cmd_packets = 1; // assume that one cmd can be sent
hci_stack.state = HCI_STATE_INITIALIZING;
hci_stack.substate = 0;
break;
case HCI_POWER_OFF:
hci_stack.state = HCI_STATE_OFF;
break;
case HCI_POWER_SLEEP:
// do nothing
break;
}
break;
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}
// create internal event
hci_emit_state();
// trigger next/first action
hci_run();
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return 0;
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}
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void hci_discoverable_control(uint8_t enable){
if (enable) enable = 1; // normalize argument
if (hci_stack.discoverable == enable){
hci_emit_discoverable_enabled(hci_stack.discoverable);
return;
}
hci_send_cmd(&hci_write_scan_enable, 2 | enable); // 1 = inq scan, 2 = page scan
hci_stack.discoverable = enable;
}
void hci_run(){
if (hci_stack.num_cmd_packets == 0) {
// cannot send command yet
return;
}
hci_connection_t * connection;
switch (hci_stack.state){
case HCI_STATE_INITIALIZING:
if (hci_stack.substate % 2) {
// odd: waiting for command completion
return;
}
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switch (hci_stack.substate >> 1){
case 0:
hci_send_cmd(&hci_reset);
break;
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case 1:
// custom initialization
if (hci_stack.control && hci_stack.control->next_command){
uint8_t * cmd = (*hci_stack.control->next_command)(hci_stack.config);
if (cmd) {
int size = 3 + cmd[2];
hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, cmd, size);
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hci_stack.substate = 0; // more init commands
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break;
}
}
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// otherwise continue
hci_send_cmd(&hci_read_bd_addr);
break;
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case 2:
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hci_send_cmd(&hci_read_buffer_size);
break;
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case 3:
// ca. 15 sec
hci_send_cmd(&hci_write_page_timeout, 0x6000);
break;
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case 4:
hci_send_cmd(&hci_write_scan_enable, 2); // page scan
break;
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case 5:
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#ifndef EMBEDDED
{
char hostname[30];
gethostname(hostname, 30);
hostname[29] = '\0';
hci_send_cmd(&hci_write_local_name, hostname);
break;
}
case 6:
#endif
// done.
hci_stack.state = HCI_STATE_WORKING;
hci_emit_state();
break;
default:
break;
}
hci_stack.substate++;
break;
case HCI_STATE_HALTING:
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log_dbg("HCI_STATE_HALTING\n");
// close all open connections
connection = (hci_connection_t *) hci_stack.connections;
if (connection){
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log_dbg("HCI_STATE_HALTING, connection %u, handle %u\n", (int) connection, connection->con_handle);
// send disconnect
hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection
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// send disconnected event right away - causes higher layer connections to get closed, too.
hci_shutdown_connection(connection);
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// remove from table
hci_stack.connections = connection->item.next;
return;
}
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log_dbg("HCI_STATE_HALTING, calling off\n");
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// switch mode
hci_power_control_off();
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hci_emit_state();
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log_dbg("HCI_STATE_HALTING, done\n");
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break;
case HCI_STATE_FALLING_ASLEEP:
switch(hci_stack.substate) {
case 0:
log_dbg("HCI_STATE_FALLING_ASLEEP\n");
// close all open connections
connection = (hci_connection_t *) hci_stack.connections;
if (connection){
log_dbg("HCI_STATE_FALLING_ASLEEP, connection %u, handle %u\n", (int) connection, connection->con_handle);
// send disconnect
hci_send_cmd(&hci_disconnect, connection->con_handle, 0x13); // remote closed connection
// send disconnected event right away - causes higher layer connections to get closed, too.
hci_shutdown_connection(connection);
// remove from table
hci_stack.connections = connection->item.next;
return;
}
log_dbg("HCI_STATE_HALTING, disabling inq & page scans\n");
// disable page and inquiry scan
hci_send_cmd(&hci_write_scan_enable, 0); // none
// continue in next sub state
hci_stack.substate++;
break;
case 1:
// wait for command complete "hci_write_scan_enable" in event_handler();
break;
case 2:
log_dbg("HCI_STATE_HALTING, calling sleep\n");
// switch mode
hci_power_control_sleep(); // changes hci_stack.state to SLEEP
hci_emit_state();
default:
break;
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}
break;
default:
break;
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}
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}
int hci_send_cmd_packet(uint8_t *packet, int size){
bd_addr_t addr;
hci_connection_t * conn;
// house-keeping
// create_connection?
if (IS_COMMAND(packet, hci_create_connection)){
bt_flip_addr(addr, &packet[3]);
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log_dbg("Create_connection to "); print_bd_addr(addr); log_dbg("\n");
conn = connection_for_address(addr);
if (conn) {
// if connection exists
if (conn->state == OPEN) {
// if OPEN, emit connection complete command
hci_emit_connection_complete(conn);
}
// otherwise, just ignore
return 0; // don't sent packet to controller
} else{
conn = create_connection_for_addr(addr);
if (conn){
// create connection struct and register, state = SENT_CREATE_CONNECTION
conn->state = SENT_CREATE_CONNECTION;
}
}
}
if (IS_COMMAND(packet, hci_link_key_request_reply)){
hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_REPLY);
}
if (IS_COMMAND(packet, hci_link_key_request_negative_reply)){
hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_LINK_KEY_NEGATIVE_REQUEST);
}
if (IS_COMMAND(packet, hci_pin_code_request_reply)){
hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_PIN_CODE_REPLY);
}
if (IS_COMMAND(packet, hci_pin_code_request_negative_reply)){
hci_add_connection_flags_for_flipped_bd_addr(&packet[3], SENT_PIN_CODE_NEGATIVE_REPLY);
}
if (IS_COMMAND(packet, hci_delete_stored_link_key)){
if (hci_stack.remote_device_db){
bt_flip_addr(addr, &packet[3]);
hci_stack.remote_device_db->delete_link_key(&addr);
}
}
hci_stack.num_cmd_packets--;
return hci_stack.hci_transport->send_packet(HCI_COMMAND_DATA_PACKET, packet, size);
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}
/**
* pre: numcmds >= 0 - it's allowed to send a command to the controller
*/
int hci_send_cmd(const hci_cmd_t *cmd, ...){
va_list argptr;
va_start(argptr, cmd);
uint8_t * hci_cmd_buffer = hci_stack.hci_cmd_buffer;
uint16_t size = hci_create_cmd_internal(hci_stack.hci_cmd_buffer, cmd, argptr);
va_end(argptr);
return hci_send_cmd_packet(hci_cmd_buffer, size);
}
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// Create various non-HCI events.
// TODO: generalize, use table similar to hci_create_command
void hci_emit_state(){
uint8_t len = 3;
uint8_t event[len];
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event[0] = BTSTACK_EVENT_STATE;
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event[1] = len - 3;
event[2] = hci_stack.state;
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
}
void hci_emit_connection_complete(hci_connection_t *conn){
uint8_t len = 13;
uint8_t event[len];
event[0] = HCI_EVENT_CONNECTION_COMPLETE;
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event[1] = len - 3;
event[2] = 0; // status = OK
bt_store_16(event, 3, conn->con_handle);
bt_flip_addr(&event[5], conn->address);
event[11] = 1; // ACL connection
event[12] = 0; // encryption disabled
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
}
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void hci_emit_l2cap_check_timeout(hci_connection_t *conn){
uint8_t len = 4;
uint8_t event[len];
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event[0] = L2CAP_EVENT_TIMEOUT_CHECK;
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event[1] = len - 2;
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bt_store_16(event, 2, conn->con_handle);
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
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}
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void hci_emit_nr_connections_changed(){
uint8_t len = 3;
uint8_t event[len];
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event[0] = BTSTACK_EVENT_NR_CONNECTIONS_CHANGED;
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event[1] = len - 2;
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event[2] = nr_hci_connections();
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
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}
void hci_emit_hci_open_failed(){
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uint8_t len = 2;
uint8_t event[len];
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event[0] = BTSTACK_EVENT_POWERON_FAILED;
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event[1] = len - 2;
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
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}
void hci_emit_btstack_version() {
uint8_t len = 6;
uint8_t event[len];
event[0] = BTSTACK_EVENT_VERSION;
event[1] = len - 2;
event[len++] = BTSTACK_MAJOR;
event[len++] = BTSTACK_MINOR;
bt_store_16(event, len, BTSTACK_REVISION);
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
}
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void hci_emit_system_bluetooth_enabled(uint8_t enabled){
uint8_t len = 3;
uint8_t event[len];
event[0] = BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED;
event[1] = len - 2;
event[2] = enabled;
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
}
void hci_emit_remote_name_cached(bd_addr_t *addr, device_name_t *name){
uint16_t len = 2+1+6+248;
uint8_t event[len];
event[0] = BTSTACK_EVENT_REMOTE_NAME_CACHED;
event[1] = len - 2;
event[2] = 0; // just to be compatible with HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE
bt_flip_addr(&event[3], *addr);
memcpy(&event[9], name, 248);
hci_dump_packet(HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
}
void hci_emit_discoverable_enabled(uint8_t enabled){
uint8_t len = 3;
uint8_t event[len];
event[0] = BTSTACK_EVENT_DISCOVERABLE_ENABLED;
event[1] = len - 2;
event[2] = enabled;
hci_dump_packet( HCI_EVENT_PACKET, 0, event, len);
hci_stack.packet_handler(HCI_EVENT_PACKET, event, len);
}