csr_hci.c

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>

#include "csr.h"

static uint16_t seqnum = 0x0000;

static int dd = -1;

int csr_open_hci(char *device)
{
	struct hci_dev_info di;
	struct hci_version ver;
	int dev = 0;

	if (device) {
		dev = hci_devid(device);
		if (dev < 0) {
			fprintf(stderr, "Device not available\n");
			return -1;
		}
	}

	dd = hci_open_dev(dev);
	if (dd < 0) {
		fprintf(stderr, "Can't open device hci%d: %s (%d)\n",
						dev, strerror(errno), errno);
		return -1;
	}

	if (hci_devinfo(dev, &di) < 0) {
		fprintf(stderr, "Can't get device info for hci%d: %s (%d)\n",
						dev, strerror(errno), errno);
		hci_close_dev(dd);
		return -1;
	}

	if (hci_read_local_version(dd, &ver, 1000) < 0) {
		fprintf(stderr, "Can't read version info for hci%d: %s (%d)\n",
						dev, strerror(errno), errno);
		hci_close_dev(dd);
		return -1;
	}

	if (ver.manufacturer != 10) {
		fprintf(stderr, "Unsupported manufacturer\n");
		hci_close_dev(dd);
		return -1;
	}

	return 0;
}

static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
{
	unsigned char cp[254], rp[254];
	struct hci_request rq;
	uint8_t cmd[10];
	uint16_t size;

	size = (length < 8) ? 9 : ((length + 1) / 2) + 5;

	cmd[0] = command & 0xff;
	cmd[1] = command >> 8;
	cmd[2] = size & 0xff;
	cmd[3] = size >> 8;
	cmd[4] = seqnum & 0xff;
	cmd[5] = seqnum >> 8;
	cmd[6] = varid & 0xff;
	cmd[7] = varid >> 8;
	cmd[8] = 0x00;
	cmd[9] = 0x00;

	memset(cp, 0, sizeof(cp));
	cp[0] = 0xc2;
	memcpy(cp + 1, cmd, sizeof(cmd));
	memcpy(cp + 11, value, length);

	switch (varid) {
	case CSR_VARID_COLD_RESET:
	case CSR_VARID_WARM_RESET:
	case CSR_VARID_COLD_HALT:
	case CSR_VARID_WARM_HALT:
		return hci_send_cmd(dd, OGF_VENDOR_CMD, 0x00, (size * 2) + 1, cp);
	}

	memset(&rq, 0, sizeof(rq));
	rq.ogf    = OGF_VENDOR_CMD;
	rq.ocf    = 0x00;
	rq.event  = EVT_VENDOR;
	rq.cparam = cp;
	rq.clen   = (size * 2) + 1;
	rq.rparam = rp;
	rq.rlen   = sizeof(rp);

	if (hci_send_req(dd, &rq, 2000) < 0)
		return -1;

	if (rp[0] != 0xc2) {
		errno = EIO;
		return -1;
	}

	if ((rp[9] + (rp[10] << 8)) != 0) {
		errno = ENXIO;
		return -1;
	}

	memcpy(value, rp + 11, length);

	return 0;
}

int csr_read_hci(uint16_t varid, uint8_t *value, uint16_t length)
{
	return do_command(0x0000, seqnum++, varid, value, length);
}

int csr_write_hci(uint16_t varid, uint8_t *value, uint16_t length)
{
	return do_command(0x0002, seqnum++, varid, value, length);
}

void csr_close_hci(void)
{
	hci_close_dev(dd);
}