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nuttx/drivers/wireless/bluetooth/bt_null.c

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/****************************************************************************
* drivers/wireless/bluetooth/bt_null.c
* UART based Bluetooth driver
*
* Copyright (C) 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/wireless/bt_driver.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/bluetooth.h>
#include <nuttx/wireless/bt_hci.h>
#include <nuttx/wireless/bt_null.h>
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void btnull_format_cmdcomplete(FAR struct bt_buf_s *buf,
uint16_t opcode);
static void btnull_format_bdaddr_rsp(FAR struct bt_buf_s *buf,
uint16_t opcode);
static int btnull_open(FAR const struct bt_driver_s *dev);
static int btnull_send(FAR const struct bt_driver_s *dev,
FAR struct bt_buf_s *buf);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct bt_driver_s g_bt_null =
{
0, /* head_reserve */
btnull_open, /* open */
btnull_send /* send */
};
static const bt_addr_t g_bt_addr =
{
{0xfe, 0xed, 0xb0, 0x0b, 0xfa, 0xce}
};
/****************************************************************************
* Private Functions
****************************************************************************/
static void btnull_format_cmdcomplete(FAR struct bt_buf_s *buf,
uint16_t opcode)
{
struct bt_hci_evt_hdr_s evt;
struct hci_evt_cmd_complete_s cmd;
FAR uint8_t *data = buf->frame->io_data;
int ndx;
int len;
/* Minimal setup for the command complete event */
len = sizeof(struct bt_hci_evt_hdr_s) +
sizeof(struct hci_evt_cmd_complete_s);
ndx = 0;
evt.evt = BT_HCI_EVT_CMD_COMPLETE;
evt.len = len;
memcpy(&data[ndx], &evt, sizeof(struct bt_hci_evt_hdr_s));
ndx += sizeof(struct bt_hci_evt_hdr_s);
cmd.ncmd = 1;
cmd.opcode = opcode;
memcpy(&data[ndx], &cmd, sizeof(struct hci_evt_cmd_complete_s));
ndx += sizeof(struct hci_evt_cmd_complete_s);
buf->frame->io_len = len;
buf->len = len;
}
static void btnull_format_local_features_rsp(FAR struct bt_buf_s *buf,
uint16_t opcode)
{
struct bt_hci_rp_le_read_local_features_s features;
FAR uint8_t *data = buf->frame->io_data;
int ndx;
int len;
/* Return local features */
btnull_format_cmdcomplete(buf, opcode);
len = buf->len +
sizeof(struct bt_hci_rp_le_read_local_features_s);
ndx = buf->len;
memset(&features, 0, sizeof(struct bt_hci_rp_le_read_local_features_s));
if (opcode == BT_HCI_OP_READ_LOCAL_FEATURES)
{
features.features[4] = BT_LMP_LE;
}
else /* if opcode == BT_HCI_OP_LE_READ_LOCAL_FEATURES */
{
features.features[0] = BT_HCI_LE_ENCRYPTION;
}
memcpy(&data[ndx], &features,
sizeof(struct bt_hci_rp_le_read_local_features_s));
ndx += sizeof(struct bt_hci_rp_le_read_local_features_s);
buf->frame->io_len = len;
buf->len = len;
}
static void btnull_format_bdaddr_rsp(FAR struct bt_buf_s *buf,
uint16_t opcode)
{
struct bt_hci_rp_read_bd_addr_s bdaddr;
FAR uint8_t *data = buf->frame->io_data;
int ndx;
int len;
btnull_format_cmdcomplete(buf, opcode);
len = buf->len +
sizeof(struct bt_hci_rp_read_bd_addr_s);
ndx = buf->len;
BLUETOOTH_ADDRCOPY(bdaddr.bdaddr.val, g_bt_addr.val);
bdaddr.status = 0;
memcpy(&data[ndx], &bdaddr, sizeof(struct bt_hci_rp_read_bd_addr_s));
ndx += sizeof(struct bt_hci_rp_read_bd_addr_s);
buf->frame->io_len = len;
buf->len = len;
}
static void btnull_format_buffersize_rsp(FAR struct bt_buf_s *buf,
uint16_t opcode)
{
struct bt_hci_rp_le_read_buffer_size_s bufsize;
FAR uint8_t *data = buf->frame->io_data;
int ndx;
int len;
btnull_format_cmdcomplete(buf, opcode);
len = buf->len +
sizeof(struct bt_hci_rp_le_read_buffer_size_s);
ndx = buf->len;
bufsize.status = 0;
bufsize.le_max_len = BLUETOOTH_MAX_FRAMELEN;
bufsize.le_max_num = 1;
memcpy(&data[ndx], &bufsize, sizeof(struct bt_hci_rp_le_read_buffer_size_s));
ndx += sizeof(struct bt_hci_rp_le_read_buffer_size_s);
buf->frame->io_len = len;
buf->len = len;
}
static int btnull_send(FAR const struct bt_driver_s *dev,
FAR struct bt_buf_s *buf)
{
wlinfo("Bit bucket: length %d\n", (int)buf->len);
/* Is the Bluetooth stack waiting for an event? */
if (buf->type == BT_CMD)
{
FAR struct bt_hci_cmd_hdr_s *hdr = (FAR void *)buf->data;
FAR struct bt_buf_s *outbuf;
uint16_t opcode = hdr->opcode;
wlinfo("CMD: %04x\n", opcode);
outbuf = bt_buf_alloc(BT_EVT, NULL, 0);
if (outbuf == NULL)
{
wlerr("ERROR: Failed to allocate buffer\n");
return -ENOMEM;
}
switch (opcode)
{
case BT_HCI_OP_READ_LOCAL_FEATURES:
case BT_HCI_OP_LE_READ_LOCAL_FEATURES:
btnull_format_local_features_rsp(outbuf, opcode);
break;
case BT_HCI_OP_READ_BD_ADDR:
btnull_format_bdaddr_rsp(outbuf, opcode);
break;
case BT_HCI_OP_LE_READ_BUFFER_SIZE:
btnull_format_buffersize_rsp(outbuf, opcode);
break;
default:
btnull_format_cmdcomplete(outbuf, opcode);
break;
}
wlinfo("Send CMD complete event\n");
bt_hci_receive(outbuf);
}
return buf->len;
}
static int btnull_open(FAR const struct bt_driver_s *dev)
{
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: btnull_register
*
* Description:
* Register the NULL Bluetooth stack with the Bluetooth stack
*
* Input Parameters:
* None
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
int btnull_register(void)
{
/* Register the driver with the Bluetooth stack */
return bt_driver_register(&g_bt_null);
}
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