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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*
*
* This library is free software; you can rebastribute 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.
*
* This library is bastributed 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; 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 <stdbool.h>
#include <errno.h>
#include <glib.h>
#include "src/log.h"
#include "lib/uuid.h"
#include "src/shared/util.h"
#include "attrib/gattrib.h"
#include "attrib/att.h"
#include "attrib/gatt.h"
#include "android/bas.h"
#define ATT_NOTIFICATION_HEADER_SIZE 3
struct bt_bas {
int ref_count;
GAttrib *attrib;
struct gatt_primary *primary;
uint16_t handle;
uint16_t ccc_handle;
guint id;
};
static void bas_free(struct bt_bas *bas)
{
bt_bas_detach(bas);
g_free(bas->primary);
g_free(bas);
}
struct bt_bas *bt_bas_new(void *primary)
{
struct bt_bas *bas;
bas = g_try_new0(struct bt_bas, 1);
if (!bas)
return NULL;
if (primary)
bas->primary = g_memdup(primary, sizeof(*bas->primary));
return bt_bas_ref(bas);
}
struct bt_bas *bt_bas_ref(struct bt_bas *bas)
{
if (!bas)
return NULL;
__sync_fetch_and_add(&bas->ref_count, 1);
return bas;
}
void bt_bas_unref(struct bt_bas *bas)
{
if (!bas)
return;
if (__sync_sub_and_fetch(&bas->ref_count, 1))
return;
bas_free(bas);
}
static void value_cb(const guint8 *pdu, guint16 len, gpointer user_data)
{
DBG("Battery Level at %u", pdu[ATT_NOTIFICATION_HEADER_SIZE]);
}
static void ccc_written_cb(guint8 status, const guint8 *pdu,
guint16 plen, gpointer user_data)
{
struct bt_bas *bas = user_data;
if (status != 0) {
error("Write Scan Refresh CCC failed: %s",
att_ecode2str(status));
return;
}
DBG("Battery Level: notification enabled");
bas->id = g_attrib_register(bas->attrib, ATT_OP_HANDLE_NOTIFY,
bas->handle, value_cb, bas, NULL);
}
static void write_ccc(GAttrib *attrib, uint16_t handle, void *user_data)
{
uint8_t value[2];
put_le16(GATT_CLIENT_CHARAC_CFG_NOTIF_BIT, value);
gatt_write_char(attrib, handle, value, sizeof(value), ccc_written_cb,
user_data);
}
static void ccc_read_cb(guint8 status, const guint8 *pdu, guint16 len,
gpointer user_data)
{
struct bt_bas *bas = user_data;
if (status != 0) {
error("Error reading CCC value: %s", att_ecode2str(status));
return;
}
write_ccc(bas->attrib, bas->ccc_handle, bas);
}
static void discover_descriptor_cb(uint8_t status, GSList *descs,
void *user_data)
{
struct bt_bas *bas = user_data;
struct gatt_desc *desc;
if (status != 0) {
error("Discover descriptors failed: %s", att_ecode2str(status));
return;
}
/* There will be only one descriptor on list and it will be CCC */
desc = descs->data;
bas->ccc_handle = desc->handle;
gatt_read_char(bas->attrib, desc->handle, ccc_read_cb, bas);
}
static void bas_discovered_cb(uint8_t status, GSList *chars, void *user_data)
{
struct bt_bas *bas = user_data;
struct gatt_char *chr;
uint16_t start, end;
bt_uuid_t uuid;
if (status) {
error("Battery: %s", att_ecode2str(status));
return;
}
chr = chars->data;
bas->handle = chr->value_handle;
DBG("Battery handle: 0x%04x", bas->handle);
start = chr->value_handle + 1;
end = bas->primary->range.end;
bt_uuid16_create(&uuid, GATT_CLIENT_CHARAC_CFG_UUID);
gatt_discover_desc(bas->attrib, start, end, &uuid,
discover_descriptor_cb, bas);
}
bool bt_bas_attach(struct bt_bas *bas, void *attrib)
{
if (!bas || bas->attrib || !bas->primary)
return false;
bas->attrib = g_attrib_ref(attrib);
if (bas->handle > 0)
return true;
gatt_discover_char(bas->attrib, bas->primary->range.start,
bas->primary->range.end, NULL,
bas_discovered_cb, bas);
return true;
}
void bt_bas_detach(struct bt_bas *bas)
{
if (!bas || !bas->attrib)
return;
if (bas->id > 0) {
g_attrib_unregister(bas->attrib, bas->id);
bas->id = 0;
}
g_attrib_unref(bas->attrib);
bas->attrib = NULL;
}
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