/*
* Wireless / Bluetooth USB class
*
* Copyright (c) 2018 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <init.h>
#include <sys/byteorder.h>
#include <usb/usb_device.h>
#include <usb/usb_common.h>
#include <usb_descriptor.h>
#include <net/buf.h>
#include <bluetooth/buf.h>
#include <bluetooth/hci_raw.h>
#include <bluetooth/l2cap.h>
#define LOG_LEVEL CONFIG_USB_DEVICE_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(usb_bluetooth);
static K_FIFO_DEFINE(rx_queue);
static K_FIFO_DEFINE(tx_queue);
/* HCI command buffers */
#define CMD_BUF_SIZE BT_BUF_RX_SIZE
NET_BUF_POOL_DEFINE(tx_pool, CONFIG_BT_HCI_CMD_COUNT, CMD_BUF_SIZE,
sizeof(u8_t), NULL);
/* ACL data TX buffers */
#if defined(CONFIG_BT_CTLR_TX_BUFFERS)
#define ACL_BUF_COUNT CONFIG_BT_CTLR_TX_BUFFERS
#else
#define ACL_BUF_COUNT 4
#endif
#if defined(CONFIG_BT_CTLR_TX_BUFFER_SIZE)
#define BT_L2CAP_MTU (CONFIG_BT_CTLR_TX_BUFFER_SIZE - BT_L2CAP_HDR_SIZE)
#else
#define BT_L2CAP_MTU 64
#endif
/* Data size needed for ACL buffers */
#define BT_BUF_ACL_SIZE BT_L2CAP_BUF_SIZE(BT_L2CAP_MTU)
NET_BUF_POOL_DEFINE(acl_tx_pool, ACL_BUF_COUNT, BT_BUF_ACL_SIZE,
sizeof(u8_t), NULL);
#define BLUETOOTH_INT_EP_ADDR 0x81
#define BLUETOOTH_OUT_EP_ADDR 0x02
#define BLUETOOTH_IN_EP_ADDR 0x82
/* HCI RX/TX threads */
static K_THREAD_STACK_DEFINE(rx_thread_stack, 512);
static struct k_thread rx_thread_data;
static K_THREAD_STACK_DEFINE(tx_thread_stack, 512);
static struct k_thread tx_thread_data;
struct usb_bluetooth_config {
struct usb_if_descriptor if0;
struct usb_ep_descriptor if0_int_ep;
struct usb_ep_descriptor if0_out_ep;
struct usb_ep_descriptor if0_in_ep;
} __packed;
USBD_CLASS_DESCR_DEFINE(primary, 0)
struct usb_bluetooth_config bluetooth_cfg = {
/* Interface descriptor 0 */
.if0 = {
.bLength = sizeof(struct usb_if_descriptor),
.bDescriptorType = USB_INTERFACE_DESC,
.bInterfaceNumber = 0,
.bAlternateSetting = 0,
.bNumEndpoints = 3,
.bInterfaceClass = WIRELESS_DEVICE_CLASS,
.bInterfaceSubClass = RF_SUBCLASS,
.bInterfaceProtocol = BLUETOOTH_PROTOCOL,
.iInterface = 0,
},
/* Interrupt Endpoint */
.if0_int_ep = {
.bLength = sizeof(struct usb_ep_descriptor),
.bDescriptorType = USB_ENDPOINT_DESC,
.bEndpointAddress = BLUETOOTH_INT_EP_ADDR,
.bmAttributes = USB_DC_EP_INTERRUPT,
.wMaxPacketSize =
sys_cpu_to_le16(
CONFIG_BLUETOOTH_INT_EP_MPS),
.bInterval = 0x01,
},
/* Data Endpoint OUT */
.if0_out_ep = {
.bLength = sizeof(struct usb_ep_descriptor),
.bDescriptorType = USB_ENDPOINT_DESC,
.bEndpointAddress = BLUETOOTH_OUT_EP_ADDR,
.bmAttributes = USB_DC_EP_BULK,
.wMaxPacketSize =
sys_cpu_to_le16(
CONFIG_BLUETOOTH_BULK_EP_MPS),
.bInterval = 0x01,
},
/* Data Endpoint IN */
.if0_in_ep = {
.bLength = sizeof(struct usb_ep_descriptor),
.bDescriptorType = USB_ENDPOINT_DESC,
.bEndpointAddress = BLUETOOTH_IN_EP_ADDR,
.bmAttributes = USB_DC_EP_BULK,
.wMaxPacketSize =
sys_cpu_to_le16(
CONFIG_BLUETOOTH_BULK_EP_MPS),
.bInterval = 0x01,
},
};
#define HCI_INT_EP_IDX 0
#define HCI_OUT_EP_IDX 1
#define HCI_IN_EP_IDX 2
static struct usb_ep_cfg_data bluetooth_ep_data[] = {
{
.ep_cb = usb_transfer_ep_callback,
.ep_addr = BLUETOOTH_INT_EP_ADDR,
},
{
.ep_cb = usb_transfer_ep_callback,
.ep_addr = BLUETOOTH_OUT_EP_ADDR,
},
{
.ep_cb = usb_transfer_ep_callback,
.ep_addr = BLUETOOTH_IN_EP_ADDR,
},
};
static void hci_rx_thread(void)
{
LOG_DBG("Start USB Bluetooth thread");
while (true) {
struct net_buf *buf;
buf = net_buf_get(&rx_queue, K_FOREVER);
switch (bt_buf_get_type(buf)) {
case BT_BUF_EVT:
usb_transfer_sync(
bluetooth_ep_data[HCI_INT_EP_IDX].ep_addr,
buf->data, buf->len,
USB_TRANS_WRITE | USB_TRANS_NO_ZLP);
break;
case BT_BUF_ACL_IN:
usb_transfer_sync(
bluetooth_ep_data[HCI_IN_EP_IDX].ep_addr,
buf->data, buf->len,
USB_TRANS_WRITE);
break;
default:
LOG_ERR("Unknown type %u", bt_buf_get_type(buf));
break;
}
net_buf_unref(buf);
}
}
static void hci_tx_thread(void)
{
while (true) {
struct net_buf *buf;
buf = net_buf_get(&tx_queue, K_FOREVER);
if (bt_send(buf)) {
LOG_ERR("Error sending to driver");
net_buf_unref(buf);
}
}
}
static void acl_read_cb(u8_t ep, int size, void *priv)
{
struct net_buf *buf = priv;
if (size > 0) {
buf->len += size;
bt_buf_set_type(buf, BT_BUF_ACL_OUT);
net_buf_put(&tx_queue, buf);
buf = NULL;
}
if (buf) {
net_buf_unref(buf);
}
buf = net_buf_alloc(&acl_tx_pool, K_FOREVER);
__ASSERT_NO_MSG(buf);
net_buf_reserve(buf, BT_BUF_RESERVE);
/* Start a new read transfer */
usb_transfer(bluetooth_ep_data[HCI_OUT_EP_IDX].ep_addr, buf->data,
BT_BUF_ACL_SIZE, USB_TRANS_READ, acl_read_cb, buf);
}
static void bluetooth_status_cb(struct usb_cfg_data *cfg,
enum usb_dc_status_code status,
const u8_t *param)
{
ARG_UNUSED(cfg);
/* Check the USB status and do needed action if required */
switch (status) {
case USB_DC_ERROR:
LOG_DBG("USB device error");
break;
case USB_DC_RESET:
LOG_DBG("USB device reset detected");
break;
case USB_DC_CONNECTED:
LOG_DBG("USB device connected");
break;
case USB_DC_CONFIGURED:
LOG_DBG("USB device configured");
/* Start reading */
acl_read_cb(bluetooth_ep_data[HCI_OUT_EP_IDX].ep_addr, 0, NULL);
break;
case USB_DC_DISCONNECTED:
LOG_DBG("USB device disconnected");
/* Cancel any transfer */
usb_cancel_transfer(bluetooth_ep_data[HCI_INT_EP_IDX].ep_addr);
usb_cancel_transfer(bluetooth_ep_data[HCI_IN_EP_IDX].ep_addr);
usb_cancel_transfer(bluetooth_ep_data[HCI_OUT_EP_IDX].ep_addr);
break;
case USB_DC_SUSPEND:
LOG_DBG("USB device suspended");
break;
case USB_DC_RESUME:
LOG_DBG("USB device resumed");
break;
case USB_DC_SOF:
break;
case USB_DC_UNKNOWN:
default:
LOG_DBG("USB unknown state");
break;
}
}
static int bluetooth_class_handler(struct usb_setup_packet *setup,
s32_t *len, u8_t **data)
{
struct net_buf *buf;
LOG_DBG("len %u", *len);
if (!*len || *len > CMD_BUF_SIZE) {
LOG_ERR("Incorrect length: %d\n", *len);
return -EINVAL;
}
buf = net_buf_alloc(&tx_pool, K_NO_WAIT);
if (!buf) {
LOG_ERR("Cannot get free buffer\n");
return -ENOMEM;
}
net_buf_reserve(buf, BT_BUF_RESERVE);
bt_buf_set_type(buf, BT_BUF_CMD);
net_buf_add_mem(buf, *data, *len);
net_buf_put(&tx_queue, buf);
return 0;
}
static void bluetooth_interface_config(struct usb_desc_header *head,
u8_t bInterfaceNumber)
{
ARG_UNUSED(head);
bluetooth_cfg.if0.bInterfaceNumber = bInterfaceNumber;
}
USBD_CFG_DATA_DEFINE(primary, hci) struct usb_cfg_data bluetooth_config = {
.usb_device_description = NULL,
.interface_config = bluetooth_interface_config,
.interface_descriptor = &bluetooth_cfg.if0,
.cb_usb_status = bluetooth_status_cb,
.interface = {
.class_handler = bluetooth_class_handler,
.custom_handler = NULL,
.vendor_handler = NULL,
},
.num_endpoints = ARRAY_SIZE(bluetooth_ep_data),
.endpoint = bluetooth_ep_data,
};
static int bluetooth_init(struct device *dev)
{
int ret;
LOG_DBG("Initialization");
ret = bt_enable_raw(&rx_queue);
if (ret) {
LOG_ERR("Failed to open Bluetooth raw channel: %d", ret);
return ret;
}
k_thread_create(&rx_thread_data, rx_thread_stack,
K_THREAD_STACK_SIZEOF(rx_thread_stack),
(k_thread_entry_t)hci_rx_thread, NULL, NULL, NULL,
K_PRIO_COOP(8), 0, K_NO_WAIT);
k_thread_create(&tx_thread_data, tx_thread_stack,
K_THREAD_STACK_SIZEOF(tx_thread_stack),
(k_thread_entry_t)hci_tx_thread, NULL, NULL, NULL,
K_PRIO_COOP(8), 0, K_NO_WAIT);
return 0;
}
SYS_INIT(bluetooth_init, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);