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incubator-nuttx/drivers/usbhost/usbhost_bthci.c

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/****************************************************************************
* drivers/usbhost/usbhost_bthci.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/fs/fs.h>
#include <nuttx/irq.h>
#include <nuttx/kmalloc.h>
#include <nuttx/kthread.h>
#include <nuttx/nuttx.h>
#include <nuttx/semaphore.h>
#include <nuttx/signal.h>
#include <nuttx/wqueue.h>
#include <nuttx/net/bluetooth.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbhost.h>
#include <nuttx/wireless/bluetooth/bt_core.h>
#include <nuttx/wireless/bluetooth/bt_hci.h>
#include <nuttx/wireless/bluetooth/bt_driver.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifndef CONFIG_SCHED_WORKQUEUE
# warning "Worker thread support is required (CONFIG_SCHED_WORKQUEUE)"
#endif
/* Driver support ***********************************************************/
/* This format is used to construct the /dev/bthci[n] device driver path. It
* defined here so that it will be used consistently in all places.
*/
#define DEV_FORMAT "/dev/bthci%c"
#define DEV_NAMELEN 12
/* Used in usbhci_cfgdesc() */
#define USBHOST_IFFOUND 0x01
#define USBHOST_BINFOUND 0x02
#define USBHOST_BOUTFOUND 0x04
#define USBHOST_IINFOUND 0x08
#define USBHOST_ALLFOUND 0x0F
#define USBHOST_MAX_CREFS 0x7fff
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure contains the internal, private state of the USB host class
* driver.
*/
struct usbhost_state_s
{
/* This is the externally visible portion of the state */
struct usbhost_class_s usbclass;
struct bt_driver_s btdev;
/* The remainder of the fields are provide to the class driver */
char devchar; /* Character identifying the /dev/bthci[n] device */
volatile bool disconnected; /* TRUE: Device has been disconnected */
uint8_t ifno; /* Interface number */
mutex_t lock; /* Used to maintain mutual exclusive access */
struct work_s work; /* For interacting with the worker thread */
FAR uint8_t *tbuffer; /* The allocated transfer buffer */
size_t tbuflen; /* Size of the allocated transfer buffer */
usbhost_ep_t bulkin; /* Bulk IN endpoint */
usbhost_ep_t bulkout; /* Bulk OUT endpoint */
usbhost_ep_t intin; /* Interrupt endpoint */
FAR uint8_t *ctrlreq; /* Allocated ctrl request structure */
FAR uint8_t *evbuffer; /* Allocated event buffer */
size_t evbuflen; /* Size of the allocated event buffer */
struct work_s acwork; /* For asynchronous event work */
struct work_s evwork; /* For asynchronous event work */
int16_t acbytes; /* The number of bytes actually transferred */
int16_t evbytes; /* The number of bytes actually transferred */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Memory allocation services */
static inline FAR struct usbhost_state_s *usbhost_allocclass(void);
static inline void usbhost_freeclass(FAR struct usbhost_state_s *usbclass);
/* Device name management */
static int usbhost_allocdevno(FAR struct usbhost_state_s *priv);
static void usbhost_freedevno(FAR struct usbhost_state_s *priv);
/* Worker thread actions */
static void usbhost_destroy(FAR void *arg);
/* Helpers for usbhci_connect() */
static inline int usbhci_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc,
int desclen);
static inline int usbhost_devinit(FAR struct usbhost_state_s *priv);
/* (Little Endian) Data helpers */
static inline uint16_t usbhost_getle16(const uint8_t *val);
static inline void usbhost_putle16(uint8_t *dest, uint16_t val);
/* Transfer descriptor memory management */
static inline int usbhost_talloc(FAR struct usbhost_state_s *priv);
static inline void usbhost_tfree(FAR struct usbhost_state_s *priv);
/* struct usbhost_registry_s methods */
static FAR struct usbhost_class_s *
usbhost_create(FAR struct usbhost_hubport_s *hport,
FAR const struct usbhost_id_s *id);
/* struct usbhost_class_s methods */
static int usbhci_connect(FAR struct usbhost_class_s *usbclass,
FAR const uint8_t *configdesc, int desclen);
static int usbhost_disconnected(FAR struct usbhost_class_s *usbclass);
/* Driver methods --
* depend upon the type of NuttX driver interface exported
*/
static int usbhost_ctrl_cmd(FAR struct usbhost_state_s *priv,
uint8_t type, uint8_t req, uint16_t value,
uint16_t iface, uint8_t *payload, uint16_t len);
static void usbhost_event_work(FAR void *arg);
static void usbhost_event_callback(FAR void *arg, ssize_t nbytes);
static void usbhost_acl_callback(FAR void *arg, ssize_t nbytes);
static ssize_t usbhost_cmd_tx(FAR struct usbhost_state_s *priv,
FAR const void *buffer, size_t buflen);
static ssize_t usbhost_acl_tx(FAR struct usbhost_state_s *priv,
FAR const void *buffer, size_t buflen);
static int usbhost_bthci_send(FAR struct bt_driver_s *dev,
enum bt_buf_type_e type,
FAR void *data, size_t len);
static int usbhost_bthci_open(FAR struct bt_driver_s *dev);
static void usbhost_bthci_close(FAR struct bt_driver_s *dev);
static int usbhost_bthci_ioctl(FAR struct bt_driver_s *dev,
int cmd, unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
/* This structure provides the registry entry ID information that will be
* used to associate the USB class driver to a connected USB device.
*/
static const struct usbhost_id_s g_id[] =
{
{
USB_CLASS_WIRELESS_CONTROLLER, /* base */
0x01, /* subclass */
0x01, /* proto */
0, /* vid */
0 /* pid */
},
};
/* This is the USB host bthci class's registry entry */
static struct usbhost_registry_s g_bthci =
{
NULL, /* flink */
usbhost_create, /* create */
1, /* nids */
&g_id[0] /* id[] */
};
/* This is a bitmap that is used to allocate device names /dev/bthcia-z. */
static uint32_t g_devinuse;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_allocclass
*
* Description:
* This is really part of the logic that implements the create() method
* of struct usbhost_registry_s. This function allocates memory for one
* new class instance.
*
* Input Parameters:
* None
*
* Returned Value:
* On success, this function will return a non-NULL instance of struct
* usbhost_class_s. NULL is returned on failure; this function will
* will fail only if there are insufficient resources to create another
* USB host class instance.
*
****************************************************************************/
static inline FAR struct usbhost_state_s *usbhost_allocclass(void)
{
FAR struct usbhost_state_s *priv;
DEBUGASSERT(!up_interrupt_context());
priv = (FAR struct usbhost_state_s *)
kmm_malloc(sizeof(struct usbhost_state_s));
uinfo("Allocated: %p\n", priv);
return priv;
}
/****************************************************************************
* Name: usbhost_freeclass
*
* Description:
* Free a class instance previously allocated by usbhost_allocclass().
*
* Input Parameters:
* usbclass - A reference to the class instance to be freed.
*
* Returned Value:
* None
*
****************************************************************************/
static inline void usbhost_freeclass(FAR struct usbhost_state_s *usbclass)
{
DEBUGASSERT(usbclass != NULL);
/* Free the class instance (perhaps calling sched_kmm_free() in case we are
* executing from an interrupt handler.
*/
uinfo("Freeing: %p\n", usbclass);
kmm_free(usbclass);
}
/****************************************************************************
* Name: Device name management
*
* Description:
* Some tiny functions to coordinate management of device names.
*
****************************************************************************/
static int usbhost_allocdevno(FAR struct usbhost_state_s *priv)
{
irqstate_t flags;
int devno;
flags = enter_critical_section();
for (devno = 0; devno < 26; devno++)
{
uint32_t bitno = 1 << devno;
if ((g_devinuse & bitno) == 0)
{
g_devinuse |= bitno;
priv->devchar = 'a' + devno;
leave_critical_section(flags);
return OK;
}
}
leave_critical_section(flags);
return -EMFILE;
}
static void usbhost_freedevno(FAR struct usbhost_state_s *priv)
{
if (priv->devchar >= 'a')
{
int devno = priv->devchar - 'a';
if (devno >= 0 && devno < 26)
{
irqstate_t flags = enter_critical_section();
g_devinuse &= ~(1 << devno);
leave_critical_section(flags);
}
}
}
/****************************************************************************
* Name: usbhost_destroy
*
* Description:
* The USB device has been disconnected and the reference count on the USB
* host class instance has gone to 1.. Time to destroy the USB host class
* instance.
*
* Input Parameters:
* arg - A reference to the class instance to be destroyed.
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_destroy(FAR void *arg)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg;
FAR struct usbhost_hubport_s *hport;
FAR struct usbhost_driver_s *drvr;
DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL);
hport = priv->usbclass.hport;
DEBUGASSERT(hport->drvr);
drvr = hport->drvr;
/* Release the device name used by this connection */
usbhost_freedevno(priv);
/* Free the endpoints */
if (priv->bulkin)
{
DRVR_EPFREE(hport->drvr, priv->bulkin);
}
if (priv->bulkout)
{
DRVR_EPFREE(hport->drvr, priv->bulkout);
}
/* Cancel any pending asynchronous I/O */
if (priv->intin)
{
DRVR_EPFREE(hport->drvr, priv->intin);
}
/* Free any transfer buffers */
usbhost_tfree(priv);
/* Destroy the semaphores */
nxmutex_destroy(&priv->lock);
/* Disconnect the USB host device */
DRVR_DISCONNECT(drvr, hport);
/* Free the function address assigned to this device */
usbhost_devaddr_destroy(hport, hport->funcaddr);
hport->funcaddr = 0;
/* And free the class instance. Hmmm.. this may execute on the worker
* thread and the work structure is part of what is getting freed. That
* should be okay because once the work contained is removed from the
* queue, it should not longer be accessed by the worker thread.
*/
usbhost_freeclass(priv);
}
/****************************************************************************
* Name: usbhci_cfgdesc
*
* Description:
* This function implements the connect() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to provide the device's configuration
* descriptor to the class so that the class may initialize properly
*
* Input Parameters:
* priv - The USB host class instance.
* configdesc - A pointer to a uint8_t buffer container the configuration
* descriptor.
* desclen - The length in bytes of the configuration descriptor.
*
* Returned Value:
* On success, zero (OK) is returned. On a failure, a negated errno value
* is returned indicating the nature of the failure
*
* Assumptions:
* This function will *not* be called from an interrupt handler.
*
****************************************************************************/
static inline int usbhci_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc, int desclen)
{
FAR struct usbhost_hubport_s *hport;
FAR struct usb_cfgdesc_s *cfgdesc;
FAR struct usb_desc_s *desc;
struct usbhost_epdesc_s bindesc;
struct usbhost_epdesc_s boutdesc;
struct usbhost_epdesc_s iindesc;
int remaining;
uint8_t found = 0;
int ret;
DEBUGASSERT(priv != NULL && priv->usbclass.hport &&
configdesc != NULL && desclen >= sizeof(struct usb_cfgdesc_s));
hport = priv->usbclass.hport;
/* Verify that we were passed a configuration descriptor */
cfgdesc = (FAR struct usb_cfgdesc_s *)configdesc;
if (cfgdesc->type != USB_DESC_TYPE_CONFIG)
{
return -EINVAL;
}
/* Get the total length of the configuration descriptor (little endian).
* It might be a good check to get the number of interfaces here too.
*/
remaining = (int)usbhost_getle16(cfgdesc->totallen);
/* Skip to the next entry descriptor */
configdesc += cfgdesc->len;
remaining -= cfgdesc->len;
/* Loop where there are more dscriptors to examine */
while (remaining >= sizeof(struct usb_desc_s))
{
/* What is the next descriptor? */
desc = (FAR struct usb_desc_s *)configdesc;
switch (desc->type)
{
/* Interface descriptor. We really should get the number of endpoints
* from this descriptor too.
*/
case USB_DESC_TYPE_INTERFACE:
{
FAR struct usb_ifdesc_s *ifdesc =
(FAR struct usb_ifdesc_s *)configdesc;
DEBUGASSERT(remaining >= USB_SIZEOF_IFDESC);
/* Save the interface number and mark ONLY the interface found */
if (ifdesc->ifno == 0)
{
priv->ifno = ifdesc->ifno;
found |= USBHOST_IFFOUND;
}
}
break;
/* Endpoint descriptor. Here, we expect two bulk endpoints, an IN
* and an OUT.
*/
case USB_DESC_TYPE_ENDPOINT:
{
FAR struct usb_epdesc_s *epdesc =
(FAR struct usb_epdesc_s *)configdesc;
DEBUGASSERT(remaining >= USB_SIZEOF_EPDESC);
if ((epdesc->attr & USB_EP_ATTR_XFERTYPE_MASK) ==
USB_EP_ATTR_XFER_INT)
{
if (USB_ISEPIN(epdesc->addr))
{
iindesc.hport = hport;
iindesc.addr = epdesc->addr &
USB_EP_ADDR_NUMBER_MASK;
iindesc.in = true;
iindesc.xfrtype = USB_EP_ATTR_XFER_INT;
iindesc.interval = epdesc->interval;
iindesc.mxpacketsize =
usbhost_getle16(epdesc->mxpacketsize);
if (iindesc.addr == 1)
{
found |= USBHOST_IINFOUND;
}
}
}
/* Check for a bulk endpoint. */
if ((epdesc->attr & USB_EP_ATTR_XFERTYPE_MASK) ==
USB_EP_ATTR_XFER_BULK)
{
/* Yes.. it is a bulk endpoint. IN or OUT? */
if (USB_ISEPOUT(epdesc->addr))
{
/* It is an OUT bulk endpoint. There should be only one
* bulk OUT endpoint.
*/
if ((found & USBHOST_BOUTFOUND) != 0)
{
/* Oops.. more than one endpoint. We don't know
* what to do with this.
*/
return -EINVAL;
}
/* Save the bulk OUT endpoint information */
boutdesc.hport = hport;
boutdesc.addr = epdesc->addr &
USB_EP_ADDR_NUMBER_MASK;
boutdesc.in = false;
boutdesc.xfrtype = USB_EP_ATTR_XFER_BULK;
boutdesc.interval = epdesc->interval;
boutdesc.mxpacketsize =
usbhost_getle16(epdesc->mxpacketsize);
if (boutdesc.addr == 2)
{
found |= USBHOST_BOUTFOUND;
}
}
else
{
/* It is an IN bulk endpoint. There should be only one
* bulk IN endpoint.
*/
if ((found & USBHOST_BINFOUND) != 0)
{
/* Oops.. more than one endpoint. We don't know
* what to do with this.
*/
return -EINVAL;
}
/* Save the bulk IN endpoint information */
bindesc.hport = hport;
bindesc.addr = epdesc->addr &
USB_EP_ADDR_NUMBER_MASK;
bindesc.in = 1;
bindesc.xfrtype = USB_EP_ATTR_XFER_BULK;
bindesc.interval = epdesc->interval;
bindesc.mxpacketsize =
usbhost_getle16(epdesc->mxpacketsize);
if (bindesc.addr == 2)
{
found |= USBHOST_BINFOUND;
}
}
}
}
break;
/* Other descriptors are just ignored for now */
default:
break;
}
/* If we found everything we need with this interface, then break out
* of the loop early.
*/
if (found == USBHOST_ALLFOUND)
{
break;
}
/* Increment the address of the next descriptor */
configdesc += desc->len;
remaining -= desc->len;
}
/* Sanity checking... did we find all of things that we need? */
if (found != USBHOST_ALLFOUND)
{
uerr("ERROR: Found IF:%s IIN:%s BIN:%s BOUT:%s\n",
(found & USBHOST_IFFOUND) != 0 ? "YES" : "NO",
(found & USBHOST_IINFOUND) != 0 ? "YES" : "NO",
(found & USBHOST_BINFOUND) != 0 ? "YES" : "NO",
(found & USBHOST_BOUTFOUND) != 0 ? "YES" : "NO");
return -EINVAL;
}
/* We are good... Allocate the endpoints */
ret = DRVR_EPALLOC(hport->drvr, &boutdesc, &priv->bulkout);
if (ret < 0)
{
uerr("ERROR: Failed to allocate Bulk OUT endpoint\n");
return ret;
}
ret = DRVR_EPALLOC(hport->drvr, &bindesc, &priv->bulkin);
if (ret < 0)
{
uerr("ERROR: Failed to allocate Bulk IN endpoint\n");
DRVR_EPFREE(hport->drvr, priv->bulkout);
return ret;
}
ret = DRVR_EPALLOC(hport->drvr, &iindesc, &priv->intin);
if (ret < 0)
{
uerr("ERROR: Failed to allocate Interrupt IN endpoint\n");
(void)DRVR_EPFREE(hport->drvr, priv->bulkout);
(void)DRVR_EPFREE(hport->drvr, priv->bulkin);
return ret;
}
uinfo("Endpoints allocated\n");
return OK;
}
/****************************************************************************
* Name: usbhost_ctrl_cmd
*
* Description:
* Do a USB control transfer.
*
* Input Parameters:
* priv - A reference to the USB host class instance.
* type - Transfer flags.
* req - control transfer type.
* value - Value for control transfer.
* index - Index for control transfer.
* payload - Data buffer.
* len - Length of data buffer.
*
* Returned Value:
* 0 on success. Negated errno on failure.
*
****************************************************************************/
static int usbhost_ctrl_cmd(FAR struct usbhost_state_s *priv,
uint8_t type, uint8_t req, uint16_t value,
uint16_t indx, FAR uint8_t *payload,
uint16_t len)
{
FAR struct usbhost_hubport_s *hport;
FAR struct usb_ctrlreq_s *ctrlreq;
int ret;
hport = priv->usbclass.hport;
ctrlreq = (FAR struct usb_ctrlreq_s *)priv->ctrlreq;
ctrlreq->type = type;
ctrlreq->req = req;
usbhost_putle16(ctrlreq->value, value);
usbhost_putle16(ctrlreq->index, indx);
usbhost_putle16(ctrlreq->len, len);
if (type & USB_REQ_DIR_IN)
{
ret = DRVR_CTRLIN(hport->drvr, hport->ep0, ctrlreq, payload);
}
else
{
ret = DRVR_CTRLOUT(hport->drvr, hport->ep0, ctrlreq, payload);
}
return ret;
}
/****************************************************************************
* Name: usbhost_event_callback
*
* Description:
* Handle event packet reception
*
* Input Parameters:
* arg - The argument provided when the asynchronous I/O was setup
* nbytes - The number of bytes actually transferred (or a negated errno
* value).
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_event_callback(FAR void *arg, ssize_t nbytes)
{
FAR struct usbhost_state_s *priv;
priv = (FAR struct usbhost_state_s *)arg;
DEBUGASSERT(priv);
if (priv->intin)
{
priv->evbytes = (int16_t)nbytes;
if (priv->evbytes >= 0 && work_available(&priv->evwork))
{
work_queue(LPWORK, &priv->evwork,
usbhost_event_work,
priv, 0);
}
}
}
/****************************************************************************
* Name: usbhost_event_work
*
* Description:
* Receive bluetooth events.
*
* Input Parameters:
* arg - A reference to the USB host class instance.
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_event_work(FAR void *arg)
{
FAR struct usbhost_state_s *priv;
FAR struct usbhost_hubport_s *hport;
int ret;
priv = (FAR struct usbhost_state_s *)arg;
DEBUGASSERT(priv);
hport = priv->usbclass.hport;
DEBUGASSERT(hport);
if (priv->evbytes > 0)
{
bt_netdev_receive(&priv->btdev, BT_EVT, priv->evbuffer,
priv->evbytes);
priv->evbytes = 0;
}
if (priv->intin)
{
ret = DRVR_ASYNCH(hport->drvr, priv->intin,
(FAR uint8_t *)priv->evbuffer,
priv->evbuflen, usbhost_event_callback,
priv);
if (ret < 0)
{
uerr("ERROR: DRVR_ASYNCH failed: %d\n", ret);
}
}
}
/****************************************************************************
* Name: usbhost_cmd_tx
*
* Description:
* Send a bluetooth HCI command.
*
* Input Parameters:
* priv - A reference to the USB host class instance.
* buffer - The buffer to be sent by the driver.
* len - The length of the buffer.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
static ssize_t usbhost_cmd_tx(FAR struct usbhost_state_s *priv,
FAR const void *buffer, size_t buflen)
{
int ret;
nxmutex_lock(&priv->lock);
ret = usbhost_ctrl_cmd(priv,
USB_REQ_DIR_OUT | USB_REQ_TYPE_CLASS |
USB_REQ_RECIPIENT_DEVICE,
0, 0, 0, (FAR uint8_t *)buffer, buflen);
nxmutex_unlock(&priv->lock);
return ret;
}
/****************************************************************************
* Name: usbhost_acl_work
*
* Description:
* Receive bluetooth ACL packets.
*
* Input Parameters:
* arg - A reference to the USB host class instance.
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_acl_work(FAR void *arg)
{
FAR struct usbhost_state_s *priv;
FAR struct usbhost_hubport_s *hport;
int ret;
priv = (FAR struct usbhost_state_s *)arg;
DEBUGASSERT(priv);
hport = priv->usbclass.hport;
DEBUGASSERT(hport);
if (priv->acbytes > 0)
{
bt_netdev_receive(&priv->btdev, BT_ACL_IN, priv->tbuffer,
priv->acbytes);
priv->acbytes = 0;
}
if (priv->bulkin)
{
ret = DRVR_ASYNCH(hport->drvr, priv->bulkin,
(FAR uint8_t *)priv->tbuffer,
priv->tbuflen, usbhost_acl_callback,
priv);
if (ret < 0)
{
uerr("ERROR: DRVR_ASYNCH failed: %d\n", ret);
}
}
}
/****************************************************************************
* Name: usbhost_acl_callback
*
* Description:
* Handle ACL packet reception
*
* Input Parameters:
* arg - The argument provided when the asynchronous I/O was setup
* nbytes - The number of bytes actually transferred (or a negated errno
* value).
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_acl_callback(FAR void *arg, ssize_t nbytes)
{
FAR struct usbhost_state_s *priv;
priv = (FAR struct usbhost_state_s *)arg;
DEBUGASSERT(priv);
if (priv->bulkin)
{
priv->acbytes = (int16_t)nbytes;
if (priv->acbytes >= 0 && work_available(&priv->acwork))
{
work_queue(LPWORK, &priv->acwork, usbhost_acl_work, priv, 0);
}
}
}
/****************************************************************************
* Name: usbhost_acl_tx
*
* Description:
* Send a bluetooth ACL packet.
*
* Input Parameters:
* priv - A reference to the USB host class instance.
* buffer - The buffer to be sent by the driver.
* len - The length of the buffer.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
static ssize_t usbhost_acl_tx(FAR struct usbhost_state_s *priv,
FAR const void *buffer, size_t buflen)
{
ssize_t nwritten = 0;
FAR struct usbhost_hubport_s *hport;
hport = priv->usbclass.hport;
DEBUGASSERT(hport);
nxmutex_lock(&priv->lock);
nwritten = DRVR_TRANSFER(hport->drvr, priv->bulkout,
(FAR uint8_t *)buffer, buflen);
if (nwritten < 0)
{
uerr("ERROR: DRVR_TRANSFER for ACL failed: %d\n", (int)nwritten);
}
else
{
nwritten = OK;
}
nxmutex_unlock(&priv->lock);
return nwritten;
}
/****************************************************************************
* Name: usbhost_bthci_send
*
* Description:
* Send the packet in the provided buffer.
*
* Input Parameters:
* btdev - An instance of the BT low-level driver's interface structure.
* type - The type of packet in the buffer.
* data - The buffer to be sent by the driver.
* len - The length of the buffer.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
static int usbhost_bthci_send(FAR struct bt_driver_s *dev,
enum bt_buf_type_e type,
FAR void *data, size_t len)
{
int ret;
FAR struct usbhost_state_s *priv;
priv = container_of(dev, struct usbhost_state_s, btdev);
if (type == BT_CMD)
{
ret = usbhost_cmd_tx(priv, data, len);
}
else if (type == BT_ACL_OUT)
{
ret = usbhost_acl_tx(priv, data, len);
}
else
{
ret = -EINVAL;
uerr("ERROR: unexpected packet type %x\n", type);
}
return ret;
}
/****************************************************************************
* Name: usbhost_bthci_open
*
* Description:
* Initialize the bluetooth hardware.
*
* Input Parameters:
* dev - An instance of the BT low-level driver's interface structure.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
static int usbhost_bthci_open(FAR struct bt_driver_s *dev)
{
return OK;
}
/****************************************************************************
* Name: usbhost_bthci_close
*
* Description:
* Close the bluetooth hardware.
*
* Input Parameters:
* dev - An instance of the BT low-level driver's interface structure.
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_bthci_close(FAR struct bt_driver_s *dev)
{
}
/****************************************************************************
* Name: usbhost_bthci_ioctl
*
* Description:
* Handle IOCTL commands directed to this device.
*
* Input Parameters:
* dev - An instance of the BT low-level driver's interface structure.
* cmd - The IOCTL command
* arg - The argument for the IOCTL command
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
static int usbhost_bthci_ioctl(FAR struct bt_driver_s *dev,
int cmd, unsigned long arg)
{
return -ENOTTY;
}
/****************************************************************************
* Name: usbhost_devinit
*
* Description:
* The USB device has been successfully connected. This completes the
* initialization operations. It is first called after the
* configuration descriptor has been received.
*
* This function is called from the connect() method. This function always
* executes on the thread of the caller of connect().
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Value:
* None
*
****************************************************************************/
static inline int usbhost_devinit(FAR struct usbhost_state_s *priv)
{
int ret = OK;
if (priv->bulkin && work_available(&priv->acwork))
{
/* Begin monitoring of acl packets */
work_queue(LPWORK, &priv->acwork, usbhost_acl_work, priv, 0);
}
if (priv->intin && work_available(&priv->evwork))
{
/* Begin monitoring of message available events */
work_queue(LPWORK, &priv->evwork, usbhost_event_work, priv, 0);
}
if (ret >= 0 && priv->devchar == 'a')
{
/* Register the driver with the network stack. */
ret = bt_netdev_register(&priv->btdev);
if (ret < 0)
{
uerr("ERROR: bt_netdev_register failed: %d\n", ret);
}
}
/* Check if we successfully initialized. */
if (ret >= 0)
{
/* Ready for normal operation */
uinfo("Successfully initialized\n");
}
return ret;
}
/****************************************************************************
* Name: usbhost_getle16
*
* Description:
* Get a (possibly unaligned) 16-bit little endian value.
*
* Input Parameters:
* val - A pointer to the first byte of the little endian value.
*
* Returned Value:
* A uint16_t representing the whole 16-bit integer value
*
****************************************************************************/
static inline uint16_t usbhost_getle16(FAR const uint8_t *val)
{
return (uint16_t)val[1] << 8 | (uint16_t)val[0];
}
/****************************************************************************
* Name: usbhost_putle16
*
* Description:
* Put a (possibly unaligned) 16-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the little endian value.
* val - The 16-bit value to be saved.
*
* Returned Value:
* None
*
****************************************************************************/
static void usbhost_putle16(FAR uint8_t *dest, uint16_t val)
{
/* Little endian means LSB first in byte stream */
dest[0] = val & 0xff;
dest[1] = val >> 8;
}
/****************************************************************************
* Name: usbhost_talloc
*
* Description:
* Allocate transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Value:
* On success, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static inline int usbhost_talloc(FAR struct usbhost_state_s *priv)
{
FAR struct usbhost_hubport_s *hport;
size_t maxlen;
int ret;
DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL &&
priv->tbuffer == NULL);
hport = priv->usbclass.hport;
/* Allocate buffer for events. */
if (priv->intin)
{
ret = DRVR_ALLOC(hport->drvr, &priv->evbuffer, &priv->evbuflen);
if (ret < 0)
{
uerr("ERROR: DRVR_IOALLOC of evbuffer failed: %d\n", ret);
return ret;
}
}
/* Allocate memory for control requests */
ret = DRVR_ALLOC(hport->drvr, (FAR uint8_t **)&priv->ctrlreq, &maxlen);
if (ret < 0)
{
uerr("ERROR: DRVR_ALLOC of ctrlreq failed: %d\n", ret);
usbhost_tfree(priv);
return ret;
}
DEBUGASSERT(maxlen >= sizeof(struct usb_ctrlreq_s));
ret = DRVR_ALLOC(hport->drvr, &priv->tbuffer, &priv->tbuflen);
if (ret < 0)
{
uerr("ERROR: DRVR_ALLOC of buffer failed: %d\n", ret);
usbhost_tfree(priv);
}
return ret;
}
/****************************************************************************
* Name: usbhost_tfree
*
* Description:
* Free transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Value:
* On success, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static inline void usbhost_tfree(FAR struct usbhost_state_s *priv)
{
FAR struct usbhost_hubport_s *hport;
DEBUGASSERT(priv != NULL && priv->usbclass.hport != NULL);
hport = priv->usbclass.hport;
if (priv->evbuffer)
{
DRVR_FREE(hport->drvr, priv->evbuffer);
priv->evbuffer = NULL;
priv->evbuflen = 0;
}
if (priv->ctrlreq)
{
DRVR_FREE(hport->drvr, priv->ctrlreq);
priv->ctrlreq = NULL;
}
if (priv->tbuffer)
{
DRVR_FREE(hport->drvr, priv->tbuffer);
priv->tbuffer = NULL;
priv->tbuflen = 0;
}
}
/****************************************************************************
* struct usbhost_registry_s methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_create
*
* Description:
* This function implements the create() method of struct
* usbhost_registry_s. The create() method is a callback into the class
* implementation. It is used to (1) create a new instance of the USB
* host class state and to (2) bind a USB host driver "session" to the
* class instance. Use of this create() method will support environments
* where there may be multiple USB ports and multiple USB devices
* simultaneously connected.
*
* Input Parameters:
* hport - The hub port that manages the new class instance.
* id - In the case where the device supports multiple base classes,
* subclasses, or protocols, this specifies which to configure for.
*
* Returned Value:
* On success, this function will return a non-NULL instance of struct
* usbhost_class_s that can be used by the USB host driver to communicate
* with the USB host class. NULL is returned on failure; this function
* will fail only if the hport input parameter is NULL or if there are
* insufficient resources to create another USB host class instance.
*
****************************************************************************/
static FAR struct usbhost_class_s *
usbhost_create(FAR struct usbhost_hubport_s *hport,
FAR const struct usbhost_id_s *id)
{
FAR struct usbhost_state_s *priv;
/* Allocate a USB host class instance */
priv = usbhost_allocclass();
if (priv == NULL)
{
return NULL;
}
/* Initialize the allocated storage class instance */
memset(priv, 0, sizeof(struct usbhost_state_s));
/* Assign a device number to this class instance */
if (usbhost_allocdevno(priv) == OK)
{
/* Initialize class method function pointers */
priv->usbclass.hport = hport;
priv->usbclass.connect = usbhci_connect;
priv->usbclass.disconnected = usbhost_disconnected;
priv->btdev.open = usbhost_bthci_open;
priv->btdev.send = usbhost_bthci_send;
priv->btdev.close = usbhost_bthci_close;
priv->btdev.ioctl = usbhost_bthci_ioctl;
/* Initialize semaphores
* (this works okay in the interrupt context)
*/
nxmutex_init(&priv->lock);
/* Return the instance of the USB class driver */
return &priv->usbclass;
}
/* An error occurred. Free the allocation and return NULL on all failures */
usbhost_freeclass(priv);
return NULL;
}
/****************************************************************************
* struct usbhost_class_s methods
****************************************************************************/
/****************************************************************************
* Name: usbhci_connect
*
* Description:
* This function implements the connect() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to provide the device's configuration
* descriptor to the class so that the class may initialize properly
*
* Input Parameters:
* usbclass - The USB host class entry previously obtained from a call to
* create().
* configdesc - A pointer to a uint8_t buffer container the configuration
* descriptor.
* desclen - The length in bytes of the configuration descriptor.
*
* Returned Value:
* On success, zero (OK) is returned. On a failure, a negated errno value
* is returned indicating the nature of the failure
*
* NOTE that the class instance remains valid upon return with a failure.
* It is the responsibility of the higher level enumeration logic to call
* CLASS_DISCONNECTED to free up the class driver resources.
*
* Assumptions:
* - This function will *not* be called from an interrupt handler.
* - If this function returns an error, the USB host controller driver
* must call to DISCONNECTED method to recover from the error
*
****************************************************************************/
static int usbhci_connect(FAR struct usbhost_class_s *usbclass,
FAR const uint8_t *configdesc, int desclen)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)usbclass;
int ret;
DEBUGASSERT(priv != NULL &&
configdesc != NULL &&
desclen >= sizeof(struct usb_cfgdesc_s));
/* Parse the configuration descriptor to get the endpoints */
ret = usbhci_cfgdesc(priv, configdesc, desclen);
if (ret < 0)
{
uerr("ERROR: usbhci_cfgdesc() failed: %d\n", ret);
}
else
{
ret = usbhost_talloc(priv);
if (ret < 0)
{
uerr("ERROR: Failed to allocate transfer buffer\n");
return ret;
}
/* Now configure the device and register the NuttX driver */
ret = usbhost_devinit(priv);
if (ret < 0)
{
uerr("ERROR: usbhost_devinit() failed: %d\n", ret);
}
}
return ret;
}
/****************************************************************************
* Name: usbhost_disconnected
*
* Description:
* This function implements the disconnected() method of struct
* usbhost_class_s. This method is a callback into the class
* implementation. It is used to inform the class that the USB device has
* been disconnected.
*
* Input Parameters:
* usbclass - The USB host class entry previously obtained from a call to
* create().
*
* Returned Value:
* On success, zero (OK) is returned. On a failure, a negated errno value
* is returned indicating the nature of the failure
*
* Assumptions:
* This function may be called from an interrupt handler.
*
****************************************************************************/
static int usbhost_disconnected(FAR struct usbhost_class_s *usbclass)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)usbclass;
irqstate_t flags;
DEBUGASSERT(priv != NULL);
/* Set an indication to any users of the device that the device is no
* longer available.
*/
flags = enter_critical_section();
priv->disconnected = true;
if (priv->devchar == 'a')
{
bt_netdev_unregister(&priv->btdev);
}
/* Cancel any ongoing transfers */
work_cancel(LPWORK, &priv->acwork);
work_cancel(LPWORK, &priv->evwork);
/* Destroy the class instance. If we are executing from an interrupt
* handler, then defer the destruction to the worker thread.
* Otherwise, destroy the instance now.
*/
if (up_interrupt_context())
{
/* Destroy the instance on the worker thread. */
DEBUGASSERT(priv->work.worker == NULL);
work_queue(LPWORK, &priv->work, usbhost_destroy, priv, 0);
}
else
{
/* Do the work now */
usbhost_destroy(priv);
}
leave_critical_section(flags);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_bthci_initialize
*
* Description:
* Initialize the USB class driver. This function should be called
* be platform-specific code in order to initialize and register support
* for the USB host class device.
*
* Input Parameters:
* None
*
* Returned Value:
* On success this function will return zero (OK); A negated errno value
* will be returned on failure.
*
****************************************************************************/
int usbhost_bthci_initialize(void)
{
/* Advertise our availability to support (certain) devices */
return usbhost_registerclass(&g_bthci);
}
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