1 /*
2 * Copyright (C) 2009-2012 by Matthias Ringwald
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the copyright holders nor the names of
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * 4. Any redistribution, use, or modification is done solely for
17 * personal benefit and not for any commercial purpose or for
18 * monetary gain.
19 *
20 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Please inquire about commercial licensing options at [email protected]
34 *
35 */
36
37 /*
38 * hci_h4_transport.c
39 *
40 * HCI Transport API implementation for basic H4 protocol over POSIX
41 *
42 * Created by Matthias Ringwald on 4/29/09.
43 */
44
45 #include "btstack_config.h"
46
47 #include <stdio.h>
48
49 #include "bluetoothdrv.h"
50
51 #include <string.h>
52
53 #include "btstack_debug.h"
54 #include "hci.h"
55 #include "hci_transport.h"
56 #include "hci_transport_h4.h"
57
58 static void h4_process(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type);
59 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size);
60
61 typedef struct hci_transport_h4 {
62 hci_transport_t transport;
63 btstack_data_source_t *ds;
64 /* power management support, e.g. used by iOS */
65 btstack_timer_source_t sleep_timer;
66 } hci_transport_h4_t;
67
68 // single instance
69 static hci_transport_h4_t * hci_transport_h4 = NULL;
70
71 static void (*packet_handler)(uint8_t packet_type, uint8_t *packet, uint16_t size) = dummy_handler;
72
73 // packet bufffers
74 static uint8_t hci_packet_out[1+HCI_OUTGOING_PACKET_BUFFER_SIZE]; // packet type + max(acl header + acl payload, cmd header + cmd data)
75 static uint8_t hci_packet_in[ 1+HCI_INCOMING_PACKET_BUFFER_SIZE]; // packet type + max(acl header + acl payload, event header + event data)
76
h4_open(void)77 static int h4_open(void){
78 int fd = mtk_bt_enable();
79
80 if (fd < 0) {
81 log_error("mtk_bt_enable failed");
82 return -1;
83 }
84
85 // set up data_source
86 hci_transport_h4->ds = (btstack_data_source_t*) malloc(sizeof(btstack_data_source_t));
87 if (!hci_transport_h4->ds) return -1;
88 memset(hci_transport_h4->ds, 0, sizeof(btstack_data_source_t));
89 btstack_run_loop_set_data_source_fd(hci_transport_h4->ds, fd);
90 btstack_run_loop_set_data_source_handler(hci_transport_h4->ds, &h4_process);
91 btstack_run_loop_enable_data_source_callbacks(hci_transport_h4->ds, DATA_SOURCE_CALLBACK_READ);
92 btstack_run_loop_add_data_source(hci_transport_h4->ds);
93 return 0;
94 }
95
h4_close(void)96 static int h4_close(void){
97
98 mtk_bt_disable(hci_transport_h4->ds->source.fd);
99
100 // first remove run loop handler
101 btstack_run_loop_remove_data_source(hci_transport_h4->ds);
102
103 // free struct
104 free(hci_transport_h4->ds);
105 hci_transport_h4->ds = NULL;
106 return 0;
107 }
108
h4_send_packet(uint8_t packet_type,uint8_t * packet,int size)109 static int h4_send_packet(uint8_t packet_type, uint8_t * packet, int size){
110
111 if (hci_transport_h4->ds == NULL) return -1;
112
113 // preapare packet
114 hci_packet_out[0] = packet_type;
115 memcpy(&hci_packet_out[1], packet, size);
116
117 // send
118 int res = mtk_bt_write(hci_transport_h4->ds->source.fd, hci_packet_out, size + 1);
119
120 return 0;
121 }
122
h4_register_packet_handler(void (* handler)(uint8_t packet_type,uint8_t * packet,uint16_t size))123 static void h4_register_packet_handler(void (*handler)(uint8_t packet_type, uint8_t *packet, uint16_t size)){
124 packet_handler = handler;
125 }
126
h4_process(btstack_data_source_t * ds,btstack_data_source_callback_type_t callback_type)127 static void h4_process(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type) {
128 if (hci_transport_h4->ds->source.fd == 0) return;
129
130 // read up to bytes_to_read data in
131 ssize_t bytes_read = mtk_bt_read(hci_transport_h4->ds->source.fd, &hci_packet_in[0], sizeof(hci_packet_in));
132
133 if (bytes_read == 0) return;
134
135 // iterate over packets
136 uint16_t pos = 0;
137 while (pos < bytes_read) {
138 uint16_t packet_len;
139 switch(hci_packet_in[pos]){
140 case HCI_EVENT_PACKET:
141 packet_len = hci_packet_in[pos+2] + 3;
142 break;
143 case HCI_ACL_DATA_PACKET:
144 packet_len = little_endian_read_16(hci_packet_in, pos + 3) + 5;
145 break;
146 default:
147 log_error("h4_process: invalid packet type 0x%02x\n", hci_packet_in[pos]);
148 return;
149 }
150
151 packet_handler(hci_packet_in[pos], &hci_packet_in[pos+1], packet_len-1);
152 pos += packet_len;
153 }
154 }
155
dummy_handler(uint8_t packet_type,uint8_t * packet,uint16_t size)156 static void dummy_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){
157 }
158
159 // get h4 singleton
hci_transport_h4_instance_for_uart(const btstack_uart_t * uart_driver)160 const hci_transport_t * hci_transport_h4_instance_for_uart(const btstack_uart_t * uart_driver){
161 (void) uart_driver;
162 if (hci_transport_h4 == NULL) {
163 hci_transport_h4 = (hci_transport_h4_t*)malloc( sizeof(hci_transport_h4_t));
164 memset(hci_transport_h4, 0, sizeof(hci_transport_h4_t));
165 hci_transport_h4->transport.name = "H4 MTK";
166 hci_transport_h4->transport.open = h4_open;
167 hci_transport_h4->transport.close = h4_close;
168 hci_transport_h4->transport.send_packet = h4_send_packet;
169 hci_transport_h4->transport.register_packet_handler = h4_register_packet_handler;
170 }
171 return (hci_transport_t *) hci_transport_h4;
172 }
173