bluez/audio/headset.c

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2007  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 <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/sco.h>
#include <bluetooth/rfcomm.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>

#include <glib.h>

#include <dbus/dbus.h>

#include "dbus.h"
#include "dbus-helper.h"
#include "logging.h"
#include "ipc.h"
#include "device.h"
#include "manager.h"
#include "error.h"
#include "unix.h"
#include "headset.h"

#define RING_INTERVAL 3000

#define BUF_SIZE 1024

#define HEADSET_GAIN_SPEAKER 'S'
#define HEADSET_GAIN_MICROPHONE 'M'

static char *str_state[] = {"DISCONNECTED", "CONNECTING", "CONNECTED",
				"STREAM_STARTING", "STREAMING"};

struct pending_connect {
	DBusMessage *msg;
	GIOChannel *io;
	struct ipc_packet *pkt;
	int pkt_len;
	guint io_id;
	int sock;
	int err;
};

struct headset {
	uint32_t hsp_handle;
	uint32_t hfp_handle;

	int rfcomm_ch;

	GIOChannel *rfcomm;
	GIOChannel *sco;

	guint ring_timer;

	char buf[BUF_SIZE];
	int data_start;
	int data_length;

	headset_type_t type;

	headset_state_t state;
	GSList *pending;

	int sp_gain;
	int mic_gain;

	gboolean locked;
};

static int rfcomm_connect(struct device *device, struct pending_connect *c);

static void pending_connect_free(struct pending_connect *c)
{
	if (c->pkt)
		g_free(c->pkt);
	if (c->io) {
		g_io_channel_close(c->io);
		g_io_channel_unref(c->io);
	}
	if (c->msg)
		dbus_message_unref(c->msg);
	g_free(c);
}

static void hs_signal_gain_setting(struct device *device, const char *buf)
{
	const char *name;
	dbus_uint16_t gain;

	if (strlen(buf) < 6) {
		error("Too short string for Gain setting");
		return;
	}

	gain = (dbus_uint16_t) strtol(&buf[5], NULL, 10);

	if (gain > 15) {
		error("Invalid gain value received: %u", gain);
		return;
	}

	switch (buf[3]) {
	case HEADSET_GAIN_SPEAKER:
		if (device->headset->sp_gain == gain)
			return;
		name = "SpeakerGainChanged";
		device->headset->sp_gain = gain;
		break;
	case HEADSET_GAIN_MICROPHONE:
		if (device->headset->mic_gain == gain)
			return;
		name = "MicrophoneGainChanged";
		device->headset->mic_gain = gain;
		break;
	default:
		error("Unknown gain setting");
		return;
	}

	dbus_connection_emit_signal(device->conn, device->path,
					AUDIO_HEADSET_INTERFACE, name,
					DBUS_TYPE_UINT16, &gain,
					DBUS_TYPE_INVALID);
}

static headset_event_t parse_headset_event(const char *buf, char *rsp,
						int rsp_len)
{
	printf("Received: %s\n", buf);

	/* Return an error if this is not a proper AT command */
	if (strncmp(buf, "AT", 2)) {
		snprintf(rsp, rsp_len, "\r\nERROR\r\n");
		return HEADSET_EVENT_INVALID;
	}

	buf += 2;

	snprintf(rsp, rsp_len, "\r\nOK\r\n");

	if (!strncmp(buf, "+CKPD", 5))
		return HEADSET_EVENT_KEYPRESS;
	else if (!strncmp(buf, "+VG", 3))
		return HEADSET_EVENT_GAIN;
	else
		return HEADSET_EVENT_UNKNOWN;
}

static void close_sco(struct device *device)
{
	struct headset *hs = device->headset;

	if (hs->sco) {
		g_io_channel_close(hs->sco);
		g_io_channel_unref(hs->sco);
		hs->sco = NULL;
	}
}

static gboolean rfcomm_io_cb(GIOChannel *chan, GIOCondition cond,
				struct device *device)
{
	struct headset *hs;
	unsigned char buf[BUF_SIZE];
	char *cr, rsp[BUF_SIZE];
	gsize bytes_read = 0;
	gsize free_space, count, bytes_written, total_bytes_written;
	GIOError err;
	off_t cmd_len;

	if (cond & G_IO_NVAL)
		return FALSE;

	hs = device->headset;

	if (cond & (G_IO_ERR | G_IO_HUP))
		goto failed;

	err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf) - 1,
				&bytes_read);
	if (err != G_IO_ERROR_NONE)
		return TRUE;

	free_space = sizeof(hs->buf) - hs->data_start - hs->data_length - 1;

	if (free_space < bytes_read) {
		/* Very likely that the HS is sending us garbage so
		 * just ignore the data and disconnect */
		error("Too much data to fit incomming buffer");
		goto failed;
	}

	memcpy(&hs->buf[hs->data_start], buf, bytes_read);
	hs->data_length += bytes_read;

	/* Make sure the data is null terminated so we can use string
	 * functions */
	hs->buf[hs->data_start + hs->data_length] = '\0';

	cr = strchr(&hs->buf[hs->data_start], '\r');
	if (!cr)
		return TRUE;

	cmd_len	= 1 + (off_t) cr - (off_t) &hs->buf[hs->data_start];
	*cr = '\0';

	memset(rsp, 0, sizeof(rsp));

	switch (parse_headset_event(&hs->buf[hs->data_start], rsp,
					sizeof(rsp))) {
	case HEADSET_EVENT_GAIN:
		hs_signal_gain_setting(device, &hs->buf[hs->data_start] + 2);
		break;

	case HEADSET_EVENT_KEYPRESS:
		if (hs->ring_timer) {
			g_source_remove(hs->ring_timer);
			hs->ring_timer = 0;
		}

		dbus_connection_emit_signal(device->conn, device->path,
						AUDIO_HEADSET_INTERFACE,
						"AnswerRequested",
						DBUS_TYPE_INVALID);
		break;

	case HEADSET_EVENT_INVALID:
	case HEADSET_EVENT_UNKNOWN:
	default:
		debug("Unknown headset event");
		break;
	}

	count = strlen(rsp);
	total_bytes_written = bytes_written = 0;
	err = G_IO_ERROR_NONE;

	while (err == G_IO_ERROR_NONE && total_bytes_written < count) {
		err = g_io_channel_write(hs->rfcomm,
						rsp + total_bytes_written, 
						count - total_bytes_written,
						&bytes_written);
		if (err != G_IO_ERROR_NONE)
			error("Error while writting to the audio output channel");
		total_bytes_written += bytes_written;
	};

	hs->data_start += cmd_len;
	hs->data_length -= cmd_len;

	if (!hs->data_length)
		hs->data_start = 0;

	return TRUE;

failed:
	headset_set_state(device, HEADSET_STATE_DISCONNECTED);

	return FALSE;
}

static gboolean sco_cb(GIOChannel *chan, GIOCondition cond,
			struct device *device)
{
	struct headset *hs;

	if (cond & G_IO_NVAL)
		return FALSE;

	hs = device->headset;

	error("Audio connection got disconnected");

	headset_set_state(device, HEADSET_STATE_CONNECTED);

	return FALSE;
}

static GIOError headset_send(struct headset *hs, const char *str)
{
	GIOError err;
	gsize total_written, written, count;

	if (hs->state < HEADSET_STATE_CONNECTED || !hs->rfcomm) {
		error("headset_send: the headset is not connected");
		return G_IO_ERROR_UNKNOWN;
	}

	count = strlen(str);
	written = total_written = 0;

	while (total_written < count) {
		err = g_io_channel_write(hs->rfcomm, str + total_written,
					count - total_written, &written);
		if (err != G_IO_ERROR_NONE)
			return err;
		total_written += written;
	}

	return G_IO_ERROR_NONE;
}

static void pending_connect_ok(struct pending_connect *c, struct device *dev)
{
	DBusMessage *reply;

	if (c->msg) {
		reply = dbus_message_new_method_return(c->msg);
		if (reply)
			send_message_and_unref(dev->conn, reply);
	}
	else if (c->pkt) {
		struct ipc_data_cfg *rsp;
		int ret, fd;

		ret = headset_get_config(dev, c->sock, c->pkt, c->pkt_len,
						&rsp, &fd);
		if (ret == 0) {
			unix_send_cfg(c->sock, rsp, fd);
			g_free(rsp);
		}
		else
			unix_send_cfg(c->sock, NULL, -1);
	}

	pending_connect_free(c);
}

static void pending_connect_failed(struct pending_connect *c, struct device *dev)
{
	if (c->msg)
		err_connect_failed(dev->conn, c->msg, strerror(c->err));
	if (c->pkt)
		unix_send_cfg(c->sock, NULL, -1);
	pending_connect_free(c);
}

static gboolean sco_connect_cb(GIOChannel *chan, GIOCondition cond,
				struct device *device)
{
	struct headset *hs;
	struct pending_connect *c;
	int ret, sk, err;
	socklen_t len;

	if (cond & G_IO_NVAL)
		return FALSE;

	hs = device->headset;
	c = hs->pending->data;

	sk = g_io_channel_unix_get_fd(chan);

	len = sizeof(ret);
	if (getsockopt(sk, SOL_SOCKET, SO_ERROR, &ret, &len) < 0) {
		err = errno;
		error("getsockopt(SO_ERROR): %s (%d)", strerror(err), err);
		goto failed;
	}

	if (ret != 0) {
		err = ret;
		error("connect(): %s (%d)", strerror(ret), ret);
		goto failed;
	}

	debug("SCO socket opened for headset %s", device->path);

	info("SCO fd=%d", sk);
	hs->sco = chan;
	c->io = NULL;

	g_slist_foreach(hs->pending, (GFunc) pending_connect_ok, device);
	g_slist_free(hs->pending);
	hs->pending = NULL;
	fcntl(sk, F_SETFL, 0);

	headset_set_state(device, HEADSET_STATE_PLAYING);

	return FALSE;

failed:
	g_slist_foreach(hs->pending, (GFunc) pending_connect_failed, device);
	g_slist_free(hs->pending);
	hs->pending = NULL;
	headset_set_state(device, HEADSET_STATE_CONNECTED);

	return FALSE;
}

static int sco_connect(struct device *device, struct pending_connect *c)
{
	struct headset *hs = device->headset;
	struct sockaddr_sco addr;
	gboolean do_callback = FALSE;
	int sk, err;

	if (!g_slist_find(hs->pending, c))
		hs->pending = g_slist_append(hs->pending, c);

	if (hs->state != HEADSET_STATE_CONNECTED)
		return 0;

	sk = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_SCO);
	if (sk < 0) {
		err = errno;
		error("socket(BTPROTO_SCO): %s (%d)", strerror(err), err);
		return -err;
	}

	c->io = g_io_channel_unix_new(sk);
	if (!c->io) {
		close(sk);
		return -EINVAL;
	}

	memset(&addr, 0, sizeof(addr));
	addr.sco_family = AF_BLUETOOTH;
	bacpy(&addr.sco_bdaddr, BDADDR_ANY);

	if (bind(sk, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
		err = errno;
		error("socket(BTPROTO_SCO): %s (%d)", strerror(err), err);
		return -err;
	}

	if (set_nonblocking(sk) < 0) {
		err = errno;
		return -err;
	}

	memset(&addr, 0, sizeof(addr));
	addr.sco_family = AF_BLUETOOTH;
	bacpy(&addr.sco_bdaddr, &device->dst);

	if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		if (!(errno == EAGAIN || errno == EINPROGRESS)) {
			err = errno;
			error("connect: %s (%d)", strerror(errno), errno);
			return -err;
		}

		c->io_id = g_io_add_watch(c->io,
					G_IO_OUT | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
					(GIOFunc) sco_connect_cb, device);
	} else
		do_callback = TRUE;

	headset_set_state(device, HEADSET_STATE_PLAY_IN_PROGRESS);
	if (!g_slist_find(hs->pending, c))
		hs->pending = g_slist_append(hs->pending, c);

	if (do_callback)
		sco_connect_cb(c->io, G_IO_OUT, device);

	return 0;
}

static gboolean rfcomm_connect_cb(GIOChannel *chan, GIOCondition cond,
					struct device *device)
{
	struct headset *hs;
	struct pending_connect *c;
	char hs_address[18];
	int sk, ret, err = 0;
	socklen_t len;

	if (cond & G_IO_NVAL)
		return FALSE;

	hs = device->headset;
	c = hs->pending->data;

	sk = g_io_channel_unix_get_fd(chan);

	len = sizeof(ret);
	if (getsockopt(sk, SOL_SOCKET, SO_ERROR, &ret, &len) < 0) {
		err = errno;
		error("getsockopt(SO_ERROR): %s (%d)", strerror(err), err);
		goto failed;
	}

	if (ret != 0) {
		err = ret;
		error("connect(): %s (%d)", strerror(ret), ret);
		goto failed;
	}

	ba2str(&device->dst, hs_address);
	hs->rfcomm = chan;
	c->io = NULL;

	headset_set_state(device, HEADSET_STATE_CONNECTED);

	debug("%s: Connected to %s", device->path, hs_address);

	g_io_add_watch(chan, G_IO_IN | G_IO_ERR | G_IO_HUP| G_IO_NVAL,
			(GIOFunc) rfcomm_io_cb, device);

	if (c->pkt) {
		if (sco_connect(device, c) < 0)
			goto failed;
		return FALSE;
	}

	g_slist_foreach(hs->pending, (GFunc) pending_connect_ok, device);
	g_slist_free(hs->pending);
	hs->pending = NULL;

	return FALSE;

failed:
	g_slist_foreach(hs->pending, (GFunc) pending_connect_failed, device);
	g_slist_free(hs->pending);
	hs->pending = NULL;
	if (hs->rfcomm)
		headset_set_state(device, HEADSET_STATE_CONNECTED);
	else
		headset_set_state(device, HEADSET_STATE_DISCONNECTED);

	return FALSE;
}

static void get_record_reply(DBusPendingCall *call, void *data)
{
	DBusMessage *reply;
	DBusError derr;
	uint8_t *array;
	int array_len, record_len, err = EIO, ch = -1;
	sdp_record_t *record = NULL;
	sdp_list_t *protos, *classes = NULL;
	uuid_t uuid;
	struct device *device = data;
	struct headset *hs = device->headset;
	struct pending_connect *c;

	c = hs->pending->data;

	reply = dbus_pending_call_steal_reply(call);

	dbus_error_init(&derr);
	if (dbus_set_error_from_message(&derr, reply)) {
		error("GetRemoteServiceRecord failed: %s", derr.message);
		dbus_error_free(&derr);
		goto failed_not_supported;
	}

	if (!dbus_message_get_args(reply, NULL,
				DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE,
				&array, &array_len,
				DBUS_TYPE_INVALID)) {
		error("Unable to get args from GetRecordReply");
		goto failed_not_supported;
	}

	if (!array) {
		error("get_record_reply: Unable to get handle array from reply");
		goto failed_not_supported;
	}

	record = sdp_extract_pdu(array, &record_len);
	if (!record) {
		error("Unable to extract service record from reply");
		goto failed_not_supported;
	}

	if (record_len != array_len)
		debug("warning: array len (%d) != record len (%d)",
				array_len, record_len);

	if (sdp_get_service_classes(record, &classes) < 0) {
		error("Unable to get service classes from record");
		goto failed_not_supported;
	}

	memcpy(&uuid, classes->data, sizeof(uuid));

	if (!sdp_uuid128_to_uuid(&uuid)) {
		error("Not a 16 bit UUID");
		goto failed_not_supported;
	}

	if ((uuid.type == SDP_UUID32 &&
			uuid.value.uuid32 != HEADSET_SVCLASS_ID) ||
			(uuid.type == SDP_UUID16 &&
			 uuid.value.uuid16 != HEADSET_SVCLASS_ID)) {
		error("Service classes did not contain the expected UUID");
		goto failed_not_supported;
	}

	if (!sdp_get_access_protos(record, &protos)) {
		ch = sdp_get_proto_port(protos, RFCOMM_UUID);
		sdp_list_foreach(protos, (sdp_list_func_t) sdp_list_free,
					NULL);
		sdp_list_free(protos, NULL);
		protos = NULL;
	}

	if (ch == -1) {
		error("Unable to extract RFCOMM channel from service record");
		goto failed_not_supported;
	}

	hs->rfcomm_ch = ch;

	if ((err = rfcomm_connect(device, NULL)) < 0) {
		error("Unable to connect");
		if (c->msg)
			err_connect_failed(device->conn, c->msg,
						strerror(-err));
		goto failed;
	}

	sdp_list_free(classes, free);
	sdp_record_free(record);
	dbus_message_unref(reply);

	device_finish_sdp_transaction(device);

	return;

failed_not_supported:
	if (c->msg)
		err_not_supported(device->conn, c->msg);
failed:
	if (classes)
		sdp_list_free(classes, free);
	if (record)
		sdp_record_free(record);
	if (reply)
		dbus_message_unref(reply);
	g_slist_foreach(hs->pending, (GFunc) pending_connect_failed, device);
	g_slist_free(hs->pending);
	hs->pending = NULL;
	headset_set_state(device, HEADSET_STATE_DISCONNECTED);
	device_finish_sdp_transaction(device);
}

static void get_handles_reply(DBusPendingCall *call, void *data)
{
	DBusMessage *msg = NULL, *reply;
	DBusPendingCall *pending;
	DBusError derr;
	struct device *device = data;
	struct headset *hs = device->headset;
	struct pending_connect *c;
	char address[18], *addr_ptr = address;
	dbus_uint32_t *array = NULL;
	dbus_uint32_t handle;
	int array_len;

	c = hs->pending->data;

	reply = dbus_pending_call_steal_reply(call);

	dbus_error_init(&derr);
	if (dbus_set_error_from_message(&derr, reply)) {
		error("GetRemoteServiceHandles failed: %s", derr.message);
		if (c->msg) {
			if (dbus_error_has_name(&derr,
						"org.bluez.Error.ConnectionAttemptFailed"))
				err_connect_failed(device->conn, c->msg,
					strerror(EHOSTDOWN));
			else
				err_not_supported(device->conn, c->msg);
		}
		dbus_error_free(&derr);
		goto failed;
	}

	if (!dbus_message_get_args(reply, NULL,
				DBUS_TYPE_ARRAY, DBUS_TYPE_UINT32,
				&array, &array_len,
				DBUS_TYPE_INVALID)) {
		error("Unable to get args from reply");
		if (c->msg)
			err_not_supported(device->conn, c->msg);
		goto failed;
	}

	if (!array) {
		error("get_handles_reply: Unable to get handle array from reply");
		if (c->msg)
			err_not_supported(device->conn, c->msg);
		goto failed;
	}

	if (array_len < 1) {
		debug("No record handles found");
		if (c->msg)
			err_not_supported(device->conn, c->msg);
		goto failed;
	}

	if (array_len > 1)
		debug("Multiple records found. Using the first one.");

	msg = dbus_message_new_method_call("org.bluez", device->adapter_path,
						"org.bluez.Adapter",
						"GetRemoteServiceRecord");
	if (!msg) {
		error("Unable to allocate new method call");
		if (c->msg)
			err_connect_failed(device->conn, c->msg, strerror(ENOMEM));
		goto failed;
	}

	ba2str(&device->dst, address);

	handle = array[0];

	dbus_message_append_args(msg, DBUS_TYPE_STRING, &addr_ptr,
					DBUS_TYPE_UINT32, &handle,
					DBUS_TYPE_INVALID);

	if (!dbus_connection_send_with_reply(device->conn, msg, &pending, -1)) {
		error("Sending GetRemoteServiceRecord failed");
		if (c->msg)
			err_connect_failed(device->conn, c->msg, strerror(EIO));
		goto failed;
	}

	dbus_pending_call_set_notify(pending, get_record_reply, device, NULL);
	dbus_pending_call_unref(pending);
	dbus_message_unref(msg);
	dbus_message_unref(reply);

	return;

failed:
	if (msg)
		dbus_message_unref(msg);
	dbus_message_unref(reply);
	g_slist_foreach(hs->pending, (GFunc) pending_connect_failed, device);
	g_slist_free(hs->pending);
	hs->pending = NULL;
	headset_set_state(device, HEADSET_STATE_DISCONNECTED);
}

static int get_handles(struct device *device)
{
	DBusPendingCall *pending;
	struct headset *hs = device->headset;
	const char *hs_svc;
	const char *addr_ptr;
	char hs_address[18];
	DBusMessage *msg;

	msg = dbus_message_new_method_call("org.bluez", device->adapter_path,
						"org.bluez.Adapter",
						"GetRemoteServiceHandles");
	if (!msg) {
		error("Could not create a new dbus message");
		return -EINVAL;
	}

	if (hs->type == SVC_HEADSET)
		hs_svc = "hsp";
	else
		hs_svc = "hfp";

	ba2str(&device->dst, hs_address);
	addr_ptr = hs_address;
	dbus_message_append_args(msg, DBUS_TYPE_STRING, &addr_ptr,
					DBUS_TYPE_STRING, &hs_svc,
					DBUS_TYPE_INVALID);

	headset_set_state(device, HEADSET_STATE_CONNECT_IN_PROGRESS);
	if (!dbus_connection_send_with_reply(device->conn, msg, &pending, -1)) {
		error("Sending GetRemoteServiceHandles failed");
		dbus_message_unref(msg);
		return -EIO;
	}

	dbus_pending_call_set_notify(pending, get_handles_reply, device, NULL);
	dbus_pending_call_unref(pending);
	dbus_message_unref(msg);

	return 0;
}

static int rfcomm_connect(struct device *device, struct pending_connect *c)
{
	struct headset *hs = device->headset;
	struct sockaddr_rc addr;
	char address[18];
	int sk, err;

	if (c != NULL) {
		if (!g_slist_find(hs->pending, c))
			hs->pending = g_slist_append(hs->pending, c);

		hs->type = hs->hfp_handle ? SVC_HANDSFREE : SVC_HEADSET;

		if (hs->state == HEADSET_STATE_DISCONNECTED)
			return get_handles(device);
		else
			return 0;
	}
	else
		c = hs->pending->data;

	ba2str(&device->dst, address);

	debug("%s: Connecting to %s channel %d", device->path, address,
		hs->rfcomm_ch);

	sk = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
	if (sk < 0) {
		err = errno;
		error("socket: %s (%d)", strerror(err), err);
		goto failed;
	}

	memset(&addr, 0, sizeof(addr));
	addr.rc_family = AF_BLUETOOTH;
	bacpy(&addr.rc_bdaddr, BDADDR_ANY);
	addr.rc_channel = 0;

	if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		err = errno;
		error("bind: %s (%d)", strerror(errno), errno);
		goto failed;
	}

	if (set_nonblocking(sk) < 0) {
		err = errno;
		goto failed;
	}

	memset(&addr, 0, sizeof(addr));
	addr.rc_family = AF_BLUETOOTH;
	bacpy(&addr.rc_bdaddr, &device->dst);
	addr.rc_channel = hs->rfcomm_ch;

	c->io = g_io_channel_unix_new(sk);
	if (!c->io) {
		err = ENOMEM;
		error("channel_unix_new failed in rfcomm connect");
		goto failed;
	}

	if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		if (!(errno == EAGAIN || errno == EINPROGRESS)) {
			err = errno;
			error("connect() failed: %s (%d)", strerror(err), err);
			goto failed;
		}

		g_io_add_watch(c->io, G_IO_OUT | G_IO_NVAL,
				(GIOFunc) rfcomm_connect_cb, device);
	} else
		rfcomm_connect_cb(c->io, G_IO_OUT, device);

	return 0;

failed:
	if (!c->io && sk >= 0)
		close(sk);

	return -err;
}

static DBusHandlerResult hs_stop(DBusConnection *conn, DBusMessage *msg,
					void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply = NULL;

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	if (hs->state < HEADSET_STATE_PLAY_IN_PROGRESS)
		return err_not_connected(conn, msg);

	headset_set_state(device, HEADSET_STATE_CONNECTED);
	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_is_playing(DBusConnection *conn, DBusMessage *msg,
					void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply;
	dbus_bool_t playing;

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	playing = (hs->state == HEADSET_STATE_PLAYING);

	dbus_message_append_args(reply, DBUS_TYPE_BOOLEAN, &playing,
					DBUS_TYPE_INVALID);

	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_disconnect(DBusConnection *conn, DBusMessage *msg,
					void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply = NULL;
	char hs_address[18];

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	if (hs->state == HEADSET_STATE_DISCONNECTED)
		return err_not_connected(conn, msg);

	headset_set_state(device, HEADSET_STATE_DISCONNECTED);
	ba2str(&device->dst, hs_address);
	info("Disconnected from %s, %s", hs_address, device->path);

	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_is_connected(DBusConnection *conn,
						DBusMessage *msg,
						void *data)
{
	struct device *device = data;
	DBusMessage *reply;
	dbus_bool_t connected;

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	connected = (device->headset->state >= HEADSET_STATE_CONNECTED);

	dbus_message_append_args(reply, DBUS_TYPE_BOOLEAN, &connected,
					DBUS_TYPE_INVALID);

	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_connect(DBusConnection *conn, DBusMessage *msg,
					void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	struct pending_connect *c;
	int err;

	if (hs->state > HEADSET_STATE_DISCONNECTED)
		return err_already_connected(conn, msg);

	c = g_try_new0(struct pending_connect, 1);
	if (!c) {
		error("Out of memory when allocating struct pending_connect");
		return DBUS_HANDLER_RESULT_NEED_MEMORY;
	}

	c->msg = dbus_message_ref(msg);

	err = rfcomm_connect(device, c);
	if (err < 0)
		goto error;

	return DBUS_HANDLER_RESULT_HANDLED;

error:
	pending_connect_free(c);
	return err_connect_failed(conn, msg, strerror(-err));
}

static gboolean ring_timer_cb(gpointer data)
{
	struct device *device = data;

	if (headset_send(device->headset, "\r\nRING\r\n") != G_IO_ERROR_NONE)
		error("Sending RING failed");

	return TRUE;
}

static DBusHandlerResult hs_ring(DBusConnection *conn, DBusMessage *msg,
					void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply = NULL;

	if (hs->state < HEADSET_STATE_CONNECTED)
		return err_not_connected(conn, msg);

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	if (hs->ring_timer) {
		debug("IndicateCall received when already indicating");
		goto done;
	}

	if (headset_send(device->headset, "\r\nRING\r\n") != G_IO_ERROR_NONE) {
		dbus_message_unref(reply);
		return err_failed(conn, msg, "Failed");
	}

	hs->ring_timer = g_timeout_add(RING_INTERVAL, ring_timer_cb, device);

done:
	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_cancel_ringing(DBusConnection *conn,
						DBusMessage *msg,
						void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply = NULL;

	if (hs->state < HEADSET_STATE_CONNECTED)
		return err_not_connected(conn, msg);

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	if (!hs->ring_timer) {
		debug("Got CancelRinging method call but ringing is not in progress");
		goto done;
	}

	g_source_remove(hs->ring_timer);
	hs->ring_timer = 0;

done:
	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_play(DBusConnection *conn, DBusMessage *msg,
					void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	struct pending_connect *c;
	int err;

	if (hs->state < HEADSET_STATE_CONNECTED)
		return err_not_connected(conn, msg);

	if (hs->state >= HEADSET_STATE_PLAY_IN_PROGRESS)
		return err_already_connected(conn, msg);

	c = g_try_new0(struct pending_connect, 1);
	if (!c)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	c->msg = msg ? dbus_message_ref(msg) : NULL;

	err = sco_connect(device, c);
	if (err < 0) {
		pending_connect_free(c);
		return err_failed(conn, msg, strerror(-err));
	}

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_get_speaker_gain(DBusConnection *conn,
						DBusMessage *msg,
						void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply;
	dbus_uint16_t gain;

	if (hs->state < HEADSET_STATE_CONNECTED || hs->sp_gain < 0)
		return err_not_available(conn, msg);

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	gain = (dbus_uint16_t) hs->sp_gain;

	dbus_message_append_args(reply, DBUS_TYPE_UINT16, &gain,
					DBUS_TYPE_INVALID);

	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_get_mic_gain(DBusConnection *conn,
						DBusMessage *msg,
						void *data)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply;
	dbus_uint16_t gain;

	if (hs->state < HEADSET_STATE_CONNECTED || hs->mic_gain < 0)
		return err_not_available(conn, msg);

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	gain = (dbus_uint16_t) hs->mic_gain;

	dbus_message_append_args(reply, DBUS_TYPE_UINT16, &gain,
					DBUS_TYPE_INVALID);

	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_set_gain(DBusConnection *conn,
					DBusMessage *msg,
					void *data, char type)
{
	struct device *device = data;
	struct headset *hs = device->headset;
	DBusMessage *reply;
	DBusError derr;
	dbus_uint16_t gain;
	char str[13];

	if (hs->state < HEADSET_STATE_CONNECTED)
		return err_not_connected(conn, msg);

	dbus_error_init(&derr);
	dbus_message_get_args(msg, &derr, DBUS_TYPE_UINT16, &gain,
				DBUS_TYPE_INVALID);

	if (dbus_error_is_set(&derr)) {
		err_invalid_args(conn, msg, derr.message);
		dbus_error_free(&derr);
		return DBUS_HANDLER_RESULT_HANDLED;
	}

	if (gain > 15)
		return err_invalid_args(conn, msg,
					"Must be less than or equal to 15");

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;

	if (hs->state != HEADSET_STATE_PLAYING)
		goto done;

	snprintf(str, sizeof(str) - 1, "\r\n+VG%c=%u\r\n", type, gain);

	if (headset_send(device->headset, str) != G_IO_ERROR_NONE) {
		dbus_message_unref(reply);
		return err_failed(conn, msg, "Unable to send to headset");
	}

done:
	if (type == HEADSET_GAIN_SPEAKER) {
		hs->sp_gain = gain;
		dbus_connection_emit_signal(conn, device->path,
						AUDIO_HEADSET_INTERFACE,
						"SpeakerGainChanged",
						DBUS_TYPE_UINT16, &gain,
						DBUS_TYPE_INVALID);
	}
	else {
		hs->mic_gain = gain;
		dbus_connection_emit_signal(conn, device->path,
						AUDIO_HEADSET_INTERFACE,
						"MicrophoneGainChanged",
						DBUS_TYPE_UINT16, &gain,
						DBUS_TYPE_INVALID);
	}

	send_message_and_unref(conn, reply);

	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult hs_set_speaker_gain(DBusConnection *conn,
						DBusMessage *msg,
						void *data)
{
	return hs_set_gain(conn, msg, data, HEADSET_GAIN_SPEAKER);
}

static DBusHandlerResult hs_set_mic_gain(DBusConnection *conn,
						DBusMessage *msg,
						void *data)
{
	return hs_set_gain(conn, msg, data, HEADSET_GAIN_MICROPHONE);
}

static DBusMethodVTable headset_methods[] = {
	{ "Connect",		hs_connect,		"",	""	},
	{ "Disconnect",		hs_disconnect,		"",	""	},
	{ "IsConnected",	hs_is_connected,	"",	"b"	},
	{ "IndicateCall",	hs_ring,		"",	""	},
	{ "CancelCall",		hs_cancel_ringing,	"",	""	},
	{ "Play",		hs_play,		"",	""	},
	{ "Stop",		hs_stop,		"",	""	},
	{ "IsPlaying",		hs_is_playing,		"",	"b"	},
	{ "GetSpeakerGain",	hs_get_speaker_gain,	"",	"q"	},
	{ "GetMicrophoneGain",	hs_get_mic_gain,	"",	"q"	},
	{ "SetSpeakerGain",	hs_set_speaker_gain,	"q",	""	},
	{ "SetMicrophoneGain",	hs_set_mic_gain,	"q",	""	},
	{ NULL, NULL, NULL, NULL }
};

static DBusSignalVTable headset_signals[] = {
	{ "Connected",			""	},
	{ "Disconnected",		""	},
	{ "AnswerRequested",		""	},
	{ "Stopped",			""	},
	{ "Playing",			""	},
	{ "SpeakerGainChanged",		"q"	},
	{ "MicrophoneGainChanged",	"q"	},
	{ NULL, NULL }
};

static void headset_set_channel(struct headset *headset, sdp_record_t *record)
{
	int ch;
	sdp_list_t *protos;

	if (sdp_get_access_protos(record, &protos) < 0) {
		error("Unable to get access protos from headset record");
		return;
	}

	ch = sdp_get_proto_port(protos, RFCOMM_UUID);

	sdp_list_foreach(protos, (sdp_list_func_t) sdp_list_free, NULL);
	sdp_list_free(protos, NULL);

	if (ch > 0) {
		headset->rfcomm_ch = ch;
		debug("Discovered Headset service on RFCOMM channel %d", ch);
	} else
		error("Unable to get RFCOMM channel from Headset record");
}

void headset_update(struct device *dev, sdp_record_t *record, uint16_t svc)
{
	struct headset *headset = dev->headset;

	switch (svc) {
	case HANDSFREE_SVCLASS_ID:
		if (headset->hfp_handle &&
				(headset->hfp_handle != record->handle)) {
			error("More than one HFP record found on device");
			return;
		}

		headset->hfp_handle = record->handle;
		break;

	case HEADSET_SVCLASS_ID:
		if (headset->hsp_handle &&
				(headset->hsp_handle != record->handle)) {
			error("More than one HSP record found on device");
			return;
		}

		headset->hsp_handle = record->handle;

		/* Ignore this record if we already have access to HFP */
		if (headset->hfp_handle)
			return;

		break;

	default:
		debug("Invalid record passed to headset_update");
		return;
	}

	headset_set_channel(headset, record);
}

struct headset *headset_init(struct device *dev, sdp_record_t *record,
				uint16_t svc)
{
	struct headset *hs;

	hs = g_new0(struct headset, 1);
	hs->rfcomm_ch = -1;
	hs->sp_gain = -1;
	hs->mic_gain = -1;

	if (!record)
		goto register_iface;

	switch (svc) {
	case HANDSFREE_SVCLASS_ID:
		hs->hfp_handle = record->handle;
		break;

	case HEADSET_SVCLASS_ID:
		hs->hsp_handle = record->handle;
		break;

	default:
		debug("Invalid record passed to headset_init");
		g_free(hs);
		return NULL;
	}

	headset_set_channel(hs, record);
register_iface:
	if (!dbus_connection_register_interface(dev->conn, dev->path,
						AUDIO_HEADSET_INTERFACE,
						headset_methods,
						headset_signals, NULL)) {
		g_free(hs);
		return NULL;
	}

	return hs;
}

void headset_free(struct device *dev)
{
	struct headset *hs = dev->headset;

	if (hs->sco) {
		g_io_channel_close(hs->sco);
		g_io_channel_unref(hs->sco);
	}

	if (hs->rfcomm) {
		g_io_channel_close(hs->rfcomm);
		g_io_channel_unref(hs->rfcomm);
	}

	g_free(hs);
	dev->headset = NULL;
}

int headset_get_config(struct device *dev, int sock, struct ipc_packet *pkt,
			int pkt_len, struct ipc_data_cfg **cfg, int *fd)
{
	struct headset *hs = dev->headset;
	int err = EINVAL;
	struct pending_connect *c;

	if (hs->rfcomm && hs->sco)
		goto proceed;

	c = g_new0(struct pending_connect, 1);
	c->sock = sock;
	c->pkt = g_malloc(pkt_len);
	memcpy(c->pkt, pkt, pkt_len);

	if (hs->rfcomm == NULL)
		err = rfcomm_connect(dev, c);
	else if (hs->sco == NULL)
		err = sco_connect(dev, c);
	else
		goto error;

	if (err < 0)
		goto error;

	return 1;

proceed:
	*cfg = g_new0(struct ipc_data_cfg, 1);
	(*cfg)->fd_opt = CFG_FD_OPT_READWRITE;
	(*cfg)->codec = CFG_CODEC_NONE;
	(*cfg)->channels = 1;
	(*cfg)->channel_mode = CFG_CHANNEL_MODE_MONO;
	(*cfg)->pkt_len = 48;
	(*cfg)->sample_size = 2;
	(*cfg)->rate = 8000;
	*fd = g_io_channel_unix_get_fd(hs->sco);

	return 0;

error:
	if (c)
		pending_connect_free(c);
	return -err;
}

headset_type_t headset_get_type(struct device *dev)
{
	struct headset *hs = dev->headset;

	return hs->type;
}

void headset_set_type(struct device *dev, headset_type_t type)
{
	struct headset *hs = dev->headset;

	hs->type = type;
}

int headset_connect_rfcomm(struct device *dev, int sock)
{
	struct headset *hs = dev->headset;

	hs->rfcomm = g_io_channel_unix_new(sock);

	return hs->rfcomm ? 0 : -EINVAL;
}

int headset_close_rfcomm(struct device *dev)
{
	struct headset *hs = dev->headset;

	if (hs->ring_timer) {
		g_source_remove(hs->ring_timer);
		hs->ring_timer = 0;
	}
	if (hs->rfcomm) {
		g_io_channel_close(hs->rfcomm);
		g_io_channel_unref(hs->rfcomm);
		hs->rfcomm = NULL;
	}

	hs->data_start = 0;
	hs->data_length = 0;

	return 0;
}

void headset_set_state(struct device *dev, headset_state_t state)
{
	struct headset *hs = dev->headset;
	char str[13];

	if (hs->state == state)
		return;

	switch(state) {
	case HEADSET_STATE_DISCONNECTED:
		close_sco(dev);
		headset_close_rfcomm(dev);
		dbus_connection_emit_signal(dev->conn, dev->path,
						AUDIO_HEADSET_INTERFACE,
						"Disconnected",
						DBUS_TYPE_INVALID);
		break;
	case HEADSET_STATE_CONNECT_IN_PROGRESS:
		break;
	case HEADSET_STATE_CONNECTED:
		if (hs->state < state) {
			g_io_add_watch(hs->rfcomm,
				G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
				(GIOFunc) rfcomm_io_cb, dev);

			dbus_connection_emit_signal(dev->conn, dev->path,
						AUDIO_HEADSET_INTERFACE,
						"Connected",
						DBUS_TYPE_INVALID);
		}
		else {
			close_sco(dev);
			dbus_connection_emit_signal(dev->conn, dev->path,
						AUDIO_HEADSET_INTERFACE,
						"Stopped",
						DBUS_TYPE_INVALID);
		}
		break;
	case HEADSET_STATE_PLAY_IN_PROGRESS:
		break;
	case HEADSET_STATE_PLAYING:
		g_io_add_watch(hs->sco, G_IO_ERR | G_IO_HUP | G_IO_NVAL,
				(GIOFunc) sco_cb, dev);

		dbus_connection_emit_signal(dev->conn, dev->path,
						AUDIO_HEADSET_INTERFACE,
						"Playing", DBUS_TYPE_INVALID);

		if (hs->sp_gain >= 0) {
			snprintf(str, sizeof(str) - 1, "\r\n+VGS=%u\r\n",
				hs->sp_gain);
			headset_send(hs, str);
		}

		if (hs->mic_gain >= 0) {
			snprintf(str, sizeof(str) - 1, "\r\n+VGM=%u\r\n",
				hs->sp_gain);
			headset_send(hs, str);
		}
		break;
	}

	debug("State changed %s: %s -> %s", dev->path, str_state[hs->state],
		str_state[state]);
	hs->state = state;
}

headset_state_t headset_get_state(struct device *dev)
{
	struct headset *hs = dev->headset;

	return hs->state;
}

int headset_get_channel(struct device *dev)
{
	struct headset *hs = dev->headset;

	return hs->rfcomm_ch;
}

gboolean headset_is_active(struct device *dev)
{
	struct headset *hs = dev->headset;

	if (hs->state != HEADSET_STATE_DISCONNECTED)
		return TRUE;

	return FALSE;
}

gboolean headset_lock(struct device *dev, void *data)
{
	struct headset *hs = dev->headset;

	if (hs->locked)
		return FALSE;

	hs->locked = TRUE;

	return TRUE;
}

gboolean headset_unlock(struct device *dev, void *data)
{
	struct headset *hs = dev->headset;

	hs->locked = FALSE;

	return TRUE;
}

gboolean headset_suspend(struct device *dev, void *data)
{
	return TRUE;
}

gboolean headset_play(struct device *dev, void *data)
{
	return TRUE;
}