pulseaudio/src/modules/bluetooth/module-bluez5-discover.c

/***
  This file is part of PulseAudio.

  Copyright 2008-2013 João Paulo Rechi Vita

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) any later version.

  PulseAudio 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 Lesser General Public
  License along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

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

#include <pulsecore/core.h>
#include <pulsecore/core-util.h>
#include <pulsecore/macro.h>
#include <pulsecore/module.h>

#include "bluez5-util.h"

#include "module-bluez5-discover-symdef.h"

PA_MODULE_AUTHOR("João Paulo Rechi Vita");
PA_MODULE_DESCRIPTION("Detect available BlueZ 5 Bluetooth audio devices and load BlueZ 5 Bluetooth audio drivers");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(true);

struct userdata {
    pa_module *module;
    pa_core *core;
    pa_hashmap *loaded_device_paths;
    pa_hook_slot *device_connection_changed_slot;
    pa_bluetooth_discovery *discovery;
};

static pa_hook_result_t device_connection_changed_cb(pa_bluetooth_discovery *y, const pa_bluetooth_device *d, struct userdata *u) {
    bool module_loaded;

    pa_assert(d);
    pa_assert(u);

    module_loaded = pa_hashmap_get(u->loaded_device_paths, d->path) ? true : false;

    if (module_loaded && !pa_bluetooth_device_any_transport_connected(d)) {
        /* disconnection, the module unloads itself */
        pa_log_debug("Unregistering module for %s", d->path);
        pa_hashmap_remove(u->loaded_device_paths, d->path);
        return PA_HOOK_OK;
    }

    if (!module_loaded && pa_bluetooth_device_any_transport_connected(d)) {
        /* a new device has been connected */
        pa_module *m;
        char *args = pa_sprintf_malloc("path=%s", d->path);

        pa_log_debug("Loading module-bluez5-device %s", args);
        m = pa_module_load(u->module->core, "module-bluez5-device", args);
        pa_xfree(args);

        if (m)
            /* No need to duplicate the path here since the device object will
             * exist for the whole hashmap entry lifespan */
            pa_hashmap_put(u->loaded_device_paths, d->path, d->path);
        else
            pa_log_warn("Failed to load module for device %s", d->path);

        return PA_HOOK_OK;
    }

    return PA_HOOK_OK;
}

int pa__init(pa_module *m) {
    struct userdata *u;

    pa_assert(m);

    m->userdata = u = pa_xnew0(struct userdata, 1);
    u->module = m;
    u->core = m->core;
    u->loaded_device_paths = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);

    if (!(u->discovery = pa_bluetooth_discovery_get(u->core)))
        goto fail;

    u->device_connection_changed_slot =
        pa_hook_connect(pa_bluetooth_discovery_hook(u->discovery, PA_BLUETOOTH_HOOK_DEVICE_CONNECTION_CHANGED),
                        PA_HOOK_NORMAL, (pa_hook_cb_t) device_connection_changed_cb, u);

    return 0;

fail:
    pa__done(m);
    return -1;
}

void pa__done(pa_module *m) {
    struct userdata *u;

    pa_assert(m);

    if (!(u = m->userdata))
        return;

    if (u->device_connection_changed_slot)
        pa_hook_slot_free(u->device_connection_changed_slot);

    if (u->discovery)
        pa_bluetooth_discovery_unref(u->discovery);

    if (u->loaded_device_paths)
        pa_hashmap_free(u->loaded_device_paths);

    pa_xfree(u);
}