1 /* $NetBSD: init_swave.c,v 1.4 2015/06/16 23:04:14 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2008 Iain Hibbert
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * init information in this file gleaned from hciattach(8)
30 * command from BlueZ for Linux - see http://www.bluez.org/
31 */
32
33 #include <sys/cdefs.h>
34 __RCSID("$NetBSD: init_swave.c,v 1.4 2015/06/16 23:04:14 christos Exp $");
35
36 #include <bluetooth.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <termios.h>
42
43 #include "btattach.h"
44
45 #define HCI_CMD_SWAVE_PARAM_ACCESS_SET \
46 HCI_OPCODE(HCI_OGF_VENDOR, 0x00b)
47
48 typedef struct {
49 uint8_t sub_command;
50 uint8_t param_type;
51 uint8_t param_length;
52 uint8_t transport_flow;
53 uint8_t transport_type;
54 uint8_t transport_rate;
55 } __attribute__ ((__packed__)) hci_param_access_set_cp;
56
57 typedef struct {
58 uint8_t d0; /* ? */
59 hci_param_access_set_cp cp;
60 } __attribute__ ((__packed__)) hci_param_access_set_rp;
61
62 void
init_swave(int fd,unsigned int speed)63 init_swave(int fd, unsigned int speed)
64 {
65 hci_param_access_set_cp cp;
66 hci_param_access_set_rp rp;
67 size_t n;
68
69 cp.sub_command = 0x01; /* set */
70 cp.param_type = 0x11; /* HCI Transport */
71 cp.param_length = 0x03;
72 cp.transport_flow = 0x01; /* flow control */
73 cp.transport_type = 0x01; /* UART */
74
75 switch(speed) {
76 case B19200: cp.transport_rate = 0x03; break;
77 case B38400: cp.transport_rate = 0x02; break;
78 case B57600: cp.transport_rate = 0x01; break;
79 case B115200: cp.transport_rate = 0x00; break;
80 default:
81 errx(EXIT_FAILURE, "invalid speed for swave: %u", speed);
82 }
83
84 uart_send_cmd(fd, HCI_CMD_SWAVE_PARAM_ACCESS_SET, &cp, sizeof(cp));
85
86 /*
87 * we wait for a HCI_EVENT_VENDOR response with "0x0b" in the
88 * first byte (possibly corresponding to the OGF?), and the
89 * response should contain our settings as confirmation.
90 */
91 do {
92 n = uart_recv_ev(fd, HCI_EVENT_VENDOR, &rp, sizeof(rp));
93 } while (n != sizeof(rp) || rp.d0 != 0x0b);
94
95 if (memcmp(&cp, &rp.cp, sizeof(cp)))
96 errx(EXIT_FAILURE, "param access set failed");
97
98 /*
99 * now send a soft reset to make those parameters used
100 */
101 uart_send_cmd(fd, HCI_CMD_RESET, NULL, 0);
102 /* assume it succeeded? */
103
104 /* bluez also says there will be a confirmation packet
105 * on the new baud rate - ignore that for now
106 */
107 }
108