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      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
     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