Hi Howard,
On Wed, Jul 7, 2021 at 11:23 PM Howard Chung <howardchung@xxxxxxxxxx> wrote:
>
> From: Yun-Hao Chung <howardchung@xxxxxxxxxxxx>
>
> This implements functions to register/unregister state changed callback
> functions, the functions will be called when a device's state changed.
> Currently the state only shows initializing, available and removing,
> which is enough for plugins to register dbus objects upon device
> creation and unregister it upon device removal.
>
> Reviewed-by: Miao-chen Chou <mcchou@xxxxxxxxxxxx>
> ---
>
> src/device.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> src/device.h | 13 +++++++++++
> 2 files changed, 77 insertions(+)
>
> diff --git a/src/device.c b/src/device.c
> index e1d82eab0988..0d7444706336 100644
> --- a/src/device.c
> +++ b/src/device.c
> @@ -81,6 +81,13 @@
>
> static DBusConnection *dbus_conn = NULL;
> static unsigned service_state_cb_id;
> +static GSList *device_state_callbacks;
Use a struct queue instead of GSList.
> +
> +struct device_state_callback {
> + btd_device_state_cb cb;
> + void *user_data;
> + unsigned int id;
> +};
>
> struct btd_disconnect_data {
> guint id;
> @@ -272,6 +279,8 @@ struct btd_device {
>
> GIOChannel *att_io;
> guint store_id;
> +
> + enum btd_device_state_t state;
> };
>
> static const uint16_t uuid_list[] = {
> @@ -4095,6 +4104,23 @@ static void gatt_service_removed(struct gatt_db_attribute *attr,
> gatt_services_changed(device);
> }
>
> +static void device_change_state(struct btd_device *device,
> + enum btd_device_state_t new_state)
> +{
> + GSList *l;
> + struct device_state_callback *cb_data;
> +
> + if (device->state == new_state)
> + return;
> +
> + for (l = device_state_callbacks; l != NULL; l = g_slist_next(l)) {
> + cb_data = l->data;
> + cb_data->cb(device, new_state, cb_data->user_data);
> + }
> +
> + device->state = new_state;
> +}
> +
> static struct btd_device *device_new(struct btd_adapter *adapter,
> const char *address)
> {
> @@ -4158,6 +4184,8 @@ static struct btd_device *device_new(struct btd_adapter *adapter,
>
> device->refresh_discovery = btd_opts.refresh_discovery;
>
> + device_change_state(device, BTD_DEVICE_STATE_AVAILABLE);
> +
> return btd_device_ref(device);
> }
>
> @@ -6839,6 +6867,7 @@ void btd_device_unref(struct btd_device *device)
>
> DBG("Freeing device %s", device->path);
>
> + device_change_state(device, BTD_DEVICE_STATE_REMOVING);
> g_dbus_unregister_interface(dbus_conn, device->path, DEVICE_INTERFACE);
> }
>
> @@ -6980,3 +7009,38 @@ void btd_device_cleanup(void)
> {
> btd_service_remove_state_cb(service_state_cb_id);
> }
> +
> +unsigned int btd_device_add_state_cb(btd_device_state_cb cb, void *user_data)
> +{
> + struct device_state_callback *cb_data;
> + static unsigned int id;
> +
> + cb_data = g_new0(struct device_state_callback, 1);
> + cb_data->cb = cb;
> + cb_data->user_data = user_data;
> + cb_data->id = ++id;
> +
> + device_state_callbacks = g_slist_append(device_state_callbacks,
> + cb_data);
> +
> + return cb_data->id;
> +}
> +
> +bool btd_device_remove_state_cb(unsigned int id)
> +{
> + GSList *l;
> +
> + for (l = device_state_callbacks; l != NULL; l = g_slist_next(l)) {
> + struct device_state_callback *cb_data = l->data;
> +
> + if (cb_data && cb_data->id == id) {
> + device_state_callbacks = g_slist_remove(
> + device_state_callbacks,
> + cb_data);
> + g_free(cb_data);
> + return true;
> + }
> + }
> +
> + return false;
> +}
> diff --git a/src/device.h b/src/device.h
> index 5f615cb4b6b2..a8424aa4f098 100644
> --- a/src/device.h
> +++ b/src/device.h
> @@ -11,8 +11,18 @@
>
> #define DEVICE_INTERFACE "org.bluez.Device1"
>
> +enum btd_device_state_t {
> + BTD_DEVICE_STATE_INITIALIZING, /* Device object is creating */
> + BTD_DEVICE_STATE_AVAILABLE, /* Device object is registered */
> + BTD_DEVICE_STATE_REMOVING, /* Device object is being removed */
> +};
I got a bad feeling about adding this sort of state, are you trying to
cover some use case that we can't do with btd_service_add_state_cb? It
does seem a lot like it but at device level.
> +
> struct btd_device;
>
> +typedef void (*btd_device_state_cb) (struct btd_device *device,
> + enum btd_device_state_t new_state,
> + void *user_data);
> +
> struct btd_device *device_create(struct btd_adapter *adapter,
> const bdaddr_t *address, uint8_t bdaddr_type);
> struct btd_device *device_create_from_storage(struct btd_adapter *adapter,
> @@ -179,3 +189,6 @@ bool btd_device_all_services_allowed(struct btd_device *dev);
> void btd_device_update_allowed_services(struct btd_device *dev);
> void btd_device_init(void);
> void btd_device_cleanup(void);
> +
> +unsigned int btd_device_add_state_cb(btd_device_state_cb cb, void *user_data);
> +bool btd_device_remove_state_cb(unsigned int id);
> --
> 2.32.0.93.g670b81a890-goog
>
--
Luiz Augusto von Dentz
