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nuttx/drivers/usbhost/usbhost_rtl8187.c
patacongo 93cf78af8b Add a stub that can be used when networking is enabled, but there is no ethernet driver 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3368 42af7a65-404d-4744-a932-0658087f49c3
2011-03-11 23:35:36 +00:00

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/****************************************************************************
* drivers/usbhost/usbhost_rtl8187.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Authors: Rafael Noronha <rafael@pdsolucoes.com.br>
* Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 NuttX 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 OWNER 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.
*
****************************************************************************/
/* @TODO REMOVE LATER!!! */
#define CONFIG_WLAN_IRQ 1
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <semaphore.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/fs.h>
#include <nuttx/arch.h>
#include <nuttx/wqueue.h>
#include <nuttx/usb/usb.h>
#include <nuttx/usb/usbhost.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_WLAN)
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
#include <debug.h>
#include <wdog.h>
#include <errno.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <net/uip/uip.h>
#include <net/uip/uip-arp.h>
#include <net/uip/uip-arch.h>
#endif /* CONFIG_NET && CONFIG_NET_WLAN */
/****************************************************************************
* 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/skel[n] device driver path. It
* defined here so that it will be used consistently in all places.
*/
#define DEV_FORMAT "/dev/wlan%c"
#define DEV_NAMELEN 12
/* Used in usbhost_cfgdesc() */
#define USBHOST_IFFOUND 0x01
#define USBHOST_BINFOUND 0x02
#define USBHOST_BOUTFOUND 0x04
#define USBHOST_ALLFOUND 0x07
#define USBHOST_MAX_CREFS 0x7fff
#if defined(CONFIG_NET) && defined(CONFIG_NET_WLAN)
/* CONFIG_WLAN_NINTERFACES determines the number of physical interfaces
* that will be supported.
*/
#ifndef CONFIG_WLAN_NINTERFACES
# define CONFIG_WLAN_NINTERFACES 1
#endif
/* TX poll delay = 1 seconds. CLK_TCK is the number of clock ticks per second */
#define WLAN_WDDELAY (1*CLK_TCK)
#define WLAN_POLLHSEC (1*2)
/* TX timeout = 1 minute */
#define WLAN_TXTIMEOUT (60*CLK_TCK)
/* This is a helper pointer for accessing the contents of the WLAN header */
#define BUF ((struct uip_eth_hdr *)wlan->wl_dev.d_buf)
#endif /* CONFIG_NET && CONFIG_NET_WLAN */
/****************************************************************************
* 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 class;
/* This is an instance of the USB host driver bound to this class instance */
struct usbhost_driver_s *drvr;
/* The remainder of the fields are provide to the class driver */
char devchar; /* Character identifying the /dev/wlan[n] device */
volatile bool disconnected; /* TRUE: Device has been disconnected */
uint8_t ifno; /* Interface number */
int16_t crefs; /* Reference count on the driver instance */
sem_t exclsem; /* 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 epin; /* IN endpoint */
usbhost_ep_t epout; /* OUT endpoint */
};
#if defined(CONFIG_NET) && defined(CONFIG_NET_WLAN)
/* The wlan_driver_s encapsulates all state information for a single hardware
* interface
*/
struct wlan_driver_s
{
bool wl_bifup; /* true:ifup false:ifdown */
WDOG_ID wl_txpoll; /* TX poll timer */
WDOG_ID wl_txtimeout; /* TX timeout timer */
/* This holds the information visible to uIP/NuttX */
struct uip_driver_s wl_dev; /* Interface understood by uIP */
};
#endif /* CONFIG_NET && CONFIG_NET_WLAN */
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Semaphores */
static void usbhost_takesem(sem_t *sem);
#define usbhost_givesem(s) sem_post(s);
/* Memory allocation services */
static inline FAR struct usbhost_state_s *usbhost_allocclass(void);
static inline void usbhost_freeclass(FAR struct usbhost_state_s *class);
/* Device name management */
static int usbhost_allocdevno(FAR struct usbhost_state_s *priv);
static void usbhost_freedevno(FAR struct usbhost_state_s *priv);
static inline void usbhost_mkdevname(FAR struct usbhost_state_s *priv, char *devname);
/* Worker thread actions */
static void usbhost_destroy(FAR void *arg);
/* Helpers for usbhost_connect() */
static inline int usbhost_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr);
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);
static inline uint32_t usbhost_getle32(const uint8_t *val);
static void usbhost_putle32(uint8_t *dest, uint32_t val);
/* Transfer descriptor memory management */
static inline int usbhost_talloc(FAR struct usbhost_state_s *priv);
static inline int usbhost_tfree(FAR struct usbhost_state_s *priv);
/* struct usbhost_registry_s methods */
static struct usbhost_class_s *usbhost_create(FAR struct usbhost_driver_s *drvr,
FAR const struct usbhost_id_s *id);
/* struct usbhost_class_s methods */
static int usbhost_connect(FAR struct usbhost_class_s *class,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr);
static int usbhost_disconnected(FAR struct usbhost_class_s *class);
/* Driver methods -- depend upon the type of NuttX driver interface exported */
#if defined(CONFIG_NET) && defined(CONFIG_NET_WLAN)
/* Common TX logic */
static int wlan_transmit(FAR struct wlan_driver_s *wlan);
static int wlan_uiptxpoll(struct uip_driver_s *dev);
/* Interrupt handling */
static void wlan_receive(FAR struct wlan_driver_s *wlan);
static void wlan_txdone(FAR struct wlan_driver_s *wlan);
static int wlan_interrupt(int irq, FAR void *context);
/* Watchdog timer expirations */
static void wlan_polltimer(int argc, uint32_t arg, ...);
static void wlan_txtimeout(int argc, uint32_t arg, ...);
/* NuttX callback functions */
static int wlan_ifup(struct uip_driver_s *dev);
static int wlan_ifdown(struct uip_driver_s *dev);
static int wlan_txavail(struct uip_driver_s *dev);
#ifdef CONFIG_NET_IGMP
static int wlan_addmac(struct uip_driver_s *dev, FAR const uint8_t *mac);
static int wlan_rmmac(struct uip_driver_s *dev, FAR const uint8_t *mac);
#endif
/* Register and unregister network device */
static int wlan_initialize(int intf);
static int wlan_uninitialize(int intf);
#endif /* CONFIG_NET && CONFIG_NET_WLAN */
/****************************************************************************
* Private Data
****************************************************************************/
/* This structure provides the registry entry ID informatino that will be
* used to associate the USB class driver to a connected USB device.
*/
static const const struct usbhost_id_s g_id =
{
USB_CLASS_VENDOR_SPEC, /* base */
0xff, /* subclass */
0xff, /* proto */
CONFIG_USB_WLAN_VID, /* vid */
CONFIG_USB_WLAN_PID /* pid */
};
/* This is the USB host wireless LAN class's registry entry */
static struct usbhost_registry_s g_wlan =
{
NULL, /* flink */
usbhost_create, /* create */
1, /* nids */
&g_id /* id[] */
};
/* This is a bitmap that is used to allocate device names /dev/wlana-z. */
static uint32_t g_devinuse;
#if defined(CONFIG_NET) && defined(CONFIG_NET_WLAN)
static struct wlan_driver_s g_wlan1[CONFIG_WLAN_NINTERFACES];
#endif /* CONFIG_NET && CONFIG_NET_WLAN */
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_takesem
*
* Description:
* This is just a wrapper to handle the annoying behavior of semaphore
* waits that return due to the receipt of a signal.
*
****************************************************************************/
static void usbhost_takesem(sem_t *sem)
{
/* Take the semaphore (perhaps waiting) */
while (sem_wait(sem) != 0)
{
/* The only case that an error should occr here is if the wait was
* awakened by a signal.
*/
ASSERT(errno == EINTR);
}
}
/****************************************************************************
* 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 Values:
* 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 *)malloc(sizeof(struct usbhost_state_s));
uvdbg("Allocated: %p\n", priv);;
return priv;
}
/****************************************************************************
* Name: usbhost_freeclass
*
* Description:
* Free a class instance previously allocated by usbhost_allocclass().
*
* Input Parameters:
* class - A reference to the class instance to be freed.
*
* Returned Values:
* None
*
****************************************************************************/
static inline void usbhost_freeclass(FAR struct usbhost_state_s *class)
{
DEBUGASSERT(class != NULL);
/* Free the class instance (calling sched_free() in case we are executing
* from an interrupt handler.
*/
uvdbg("Freeing: %p\n", class);;
free(class);
}
/****************************************************************************
* 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 = irqsave();
for (devno = 0; devno < 26; devno++)
{
uint32_t bitno = 1 << devno;
if ((g_devinuse & bitno) == 0)
{
g_devinuse |= bitno;
priv->devchar = 'a' + devno;
irqrestore(flags);
return OK;
}
}
irqrestore(flags);
return -EMFILE;
}
static void usbhost_freedevno(FAR struct usbhost_state_s *priv)
{
int devno = 'a' - priv->devchar;
if (devno >= 0 && devno < 26)
{
irqstate_t flags = irqsave();
g_devinuse &= ~(1 << devno);
irqrestore(flags);
}
}
static inline void usbhost_mkdevname(FAR struct usbhost_state_s *priv, char *devname)
{
(void)snprintf(devname, DEV_NAMELEN, DEV_FORMAT, priv->devchar);
}
/****************************************************************************
* Name: usbhost_destroy
*
* Description:
* The USB device has been disconnected and the refernce 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 Values:
* None
*
****************************************************************************/
static void usbhost_destroy(FAR void *arg)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)arg;
DEBUGASSERT(priv != NULL);
uvdbg("crefs: %d\n", priv->crefs);
/* Unregister the driver */
/* Release the device name used by this connection */
usbhost_freedevno(priv);
/* Free the endpoints */
/* Free any transfer buffers */
/* Destroy the semaphores */
/* Disconnect the USB host device */
DRVR_DISCONNECT(priv->drvr);
/* 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: usbhost_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 descripor.
* desclen - The length in bytes of the configuration descriptor.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
*
* Returned Values:
* 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 usbhost_cfgdesc(FAR struct usbhost_state_s *priv,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr)
{
FAR struct usb_cfgdesc_s *cfgdesc;
FAR struct usb_desc_s *desc;
FAR struct usbhost_epdesc_s bindesc;
FAR struct usbhost_epdesc_s boutdesc;
int remaining;
uint8_t found = 0;
int ret;
DEBUGASSERT(priv != NULL &&
configdesc != NULL &&
desclen >= sizeof(struct usb_cfgdesc_s));
/* 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;
uvdbg("Interface descriptor\n");
DEBUGASSERT(remaining >= USB_SIZEOF_IFDESC);
/* Save the interface number and mark ONLY the interface found */
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;
uvdbg("Endpoint descriptor\n");
DEBUGASSERT(remaining >= USB_SIZEOF_EPDESC);
/* 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;
}
found |= USBHOST_BOUTFOUND;
/* Save the bulk OUT endpoint information */
boutdesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK;
boutdesc.in = false;
boutdesc.funcaddr = funcaddr;
boutdesc.xfrtype = USB_EP_ATTR_XFER_BULK;
boutdesc.interval = epdesc->interval;
boutdesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize);
uvdbg("Bulk OUT EP addr:%d mxpacketsize:%d\n",
boutdesc.addr, boutdesc.mxpacketsize);
}
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;
}
found |= USBHOST_BINFOUND;
/* Save the bulk IN endpoint information */
bindesc.addr = epdesc->addr & USB_EP_ADDR_NUMBER_MASK;
bindesc.in = 1;
bindesc.funcaddr = funcaddr;
bindesc.xfrtype = USB_EP_ATTR_XFER_BULK;
bindesc.interval = epdesc->interval;
bindesc.mxpacketsize = usbhost_getle16(epdesc->mxpacketsize);
uvdbg("Bulk IN EP addr:%d mxpacketsize:%d\n",
bindesc.addr, bindesc.mxpacketsize);
}
}
}
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)
{
ulldbg("ERROR: Found IF:%s BIN:%s BOUT:%s\n",
(found & USBHOST_IFFOUND) != 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(priv->drvr, &boutdesc, &priv->epout);
if (ret != OK)
{
udbg("ERROR: Failed to allocate Bulk OUT endpoint\n");
return ret;
}
ret = DRVR_EPALLOC(priv->drvr, &bindesc, &priv->epin);
if (ret != OK)
{
udbg("ERROR: Failed to allocate Bulk IN endpoint\n");
(void)DRVR_EPFREE(priv->drvr, priv->epout);
return ret;
}
ullvdbg("Endpoints allocated\n");
return OK;
}
/****************************************************************************
* 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 Values:
* None
*
****************************************************************************/
static inline int usbhost_devinit(FAR struct usbhost_state_s *priv)
{
int ret = OK;
/* Set aside a transfer buffer for exclusive use by the class driver */
/* Increment the reference count. This will prevent usbhost_destroy() from
* being called asynchronously if the device is removed.
*/
priv->crefs++;
DEBUGASSERT(priv->crefs == 2);
/* Configure the device */
/* Register the driver */
if (ret == OK)
{
char devname[DEV_NAMELEN];
uvdbg("Register block driver\n");
usbhost_mkdevname(priv, devname);
ret = wlan_initialize(0);
// ret = register_blockdriver(devname, &g_bops, 0, priv);
}
/* Check if we successfully initialized. We now have to be concerned
* about asynchronous modification of crefs because the block
* driver has been registered.
*/
if (ret == OK)
{
usbhost_takesem(&priv->exclsem);
DEBUGASSERT(priv->crefs >= 2);
/* Handle a corner case where (1) open() has been called so the
* reference count is > 2, but the device has been disconnected.
* In this case, the class instance needs to persist until close()
* is called.
*/
if (priv->crefs <= 2 && priv->disconnected)
{
/* We don't have to give the semaphore because it will be
* destroyed when usb_destroy is called.
*/
ret = -ENODEV;
}
else
{
/* Ready for normal operation as a block device driver */
uvdbg("Successfully initialized\n");
priv->crefs--;
usbhost_givesem(&priv->exclsem);
}
}
/* Disconnect on any errors detected during volume initialization */
if (ret != OK)
{
udbg("ERROR! Aborting: %d\n", ret);
usbhost_destroy(priv);
}
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 Values:
* A uint16_t representing the whole 16-bit integer value
*
****************************************************************************/
static inline uint16_t usbhost_getle16(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 Values:
* None
*
****************************************************************************/
static void usbhost_putle16(uint8_t *dest, uint16_t val)
{
dest[0] = val & 0xff; /* Little endian means LS byte first in byte stream */
dest[1] = val >> 8;
}
/****************************************************************************
* Name: usbhost_getle32
*
* Description:
* Get a (possibly unaligned) 32-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the big endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static inline uint32_t usbhost_getle32(const uint8_t *val)
{
/* Little endian means LS halfword first in byte stream */
return (uint32_t)usbhost_getle16(&val[2]) << 16 | (uint32_t)usbhost_getle16(val);
}
/****************************************************************************
* Name: usbhost_putle32
*
* Description:
* Put a (possibly unaligned) 32-bit little endian value.
*
* Input Parameters:
* dest - A pointer to the first byte to save the little endian value.
* val - The 32-bit value to be saved.
*
* Returned Values:
* None
*
****************************************************************************/
static void usbhost_putle32(uint8_t *dest, uint32_t val)
{
/* Little endian means LS halfword first in byte stream */
usbhost_putle16(dest, (uint16_t)(val & 0xffff));
usbhost_putle16(dest+2, (uint16_t)(val >> 16));
}
/****************************************************************************
* Name: usbhost_talloc
*
* Description:
* Allocate transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* On sucess, 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)
{
DEBUGASSERT(priv && priv->tbuffer == NULL);
return DRVR_ALLOC(priv->drvr, &priv->tbuffer, &priv->tbuflen);
}
/****************************************************************************
* Name: usbhost_tfree
*
* Description:
* Free transfer buffer memory.
*
* Input Parameters:
* priv - A reference to the class instance.
*
* Returned Values:
* On sucess, zero (OK) is returned. On failure, an negated errno value
* is returned to indicate the nature of the failure.
*
****************************************************************************/
static inline int usbhost_tfree(FAR struct usbhost_state_s *priv)
{
int result = OK;
DEBUGASSERT(priv);
if (priv->tbuffer)
{
DEBUGASSERT(priv->drvr);
result = DRVR_FREE(priv->drvr, priv->tbuffer);
priv->tbuffer = NULL;
priv->tbuflen = 0;
}
return result;
}
/****************************************************************************
* 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:
* drvr - An instance of struct usbhost_driver_s that the class
* implementation will "bind" to its state structure and will
* subsequently use to communicate with the USB host driver.
* id - In the case where the device supports multiple base classes,
* subclasses, or protocols, this specifies which to configure for.
*
* Returned Values:
* 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 drvr 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_driver_s *drvr,
FAR const struct usbhost_id_s *id)
{
FAR struct usbhost_state_s *priv;
/* Allocate a USB host class instance */
priv = usbhost_allocclass();
if (priv)
{
/* 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->class.connect = usbhost_connect;
priv->class.disconnected = usbhost_disconnected;
/* The initial reference count is 1... One reference is held by the driver */
priv->crefs = 1;
/* Initialize semphores (this works okay in the interrupt context) */
sem_init(&priv->exclsem, 0, 1);
/* Bind the driver to the storage class instance */
priv->drvr = drvr;
/* Return the instance of the USB class driver */
return &priv->class;
}
}
/* An error occurred. Free the allocation and return NULL on all failures */
if (priv)
{
usbhost_freeclass(priv);
}
return NULL;
}
/****************************************************************************
* struct usbhost_class_s methods
****************************************************************************/
/****************************************************************************
* Name: usbhost_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:
* class - The USB host class entry previously obtained from a call to create().
* configdesc - A pointer to a uint8_t buffer container the configuration descripor.
* desclen - The length in bytes of the configuration descriptor.
* funcaddr - The USB address of the function containing the endpoint that EP0
* controls
*
* Returned Values:
* 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.
* - If this function returns an error, the USB host controller driver
* must call to DISCONNECTED method to recover from the error
*
****************************************************************************/
static int usbhost_connect(FAR struct usbhost_class_s *class,
FAR const uint8_t *configdesc, int desclen,
uint8_t funcaddr)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)class;
int ret;
DEBUGASSERT(priv != NULL &&
configdesc != NULL &&
desclen >= sizeof(struct usb_cfgdesc_s));
/* Parse the configuration descriptor to get the endpoints */
ret = usbhost_cfgdesc(priv, configdesc, desclen, funcaddr);
if (ret != OK)
{
udbg("usbhost_cfgdesc() failed: %d\n", ret);
}
else
{
/* Now configure the device and register the NuttX driver */
ret = usbhost_devinit(priv);
if (ret != OK)
{
udbg("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:
* class - The USB host class entry previously obtained from a call to
* create().
*
* Returned Values:
* 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(struct usbhost_class_s *class)
{
FAR struct usbhost_state_s *priv = (FAR struct usbhost_state_s *)class;
irqstate_t flags;
DEBUGASSERT(priv != NULL);
/* Set an indication to any users of the device that the device is no
* longer available.
*/
flags = irqsave();
priv->disconnected = true;
/* Now check the number of references on the class instance. If it is one,
* then we can free the class instance now. Otherwise, we will have to
* wait until the holders of the references free them by closing the
* block driver.
*/
ullvdbg("crefs: %d\n", priv->crefs);
if (priv->crefs == 1)
{
/* 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. */
uvdbg("Queuing destruction: worker %p->%p\n", priv->work.worker, usbhost_destroy);
DEBUGASSERT(priv->work.worker == NULL);
(void)work_queue(&priv->work, usbhost_destroy, priv, 0);
}
else
{
/* Do the work now */
usbhost_destroy(priv);
}
}
/* Unregister WLAN network interface */
wlan_uninitialize(0);
irqrestore(flags);
return OK;
}
#if defined(CONFIG_NET) && defined(CONFIG_NET_WLAN)
/****************************************************************************
* Function: wlan_transmit
*
* Description:
* Start hardware transmission. Called either from the txdone interrupt
* handling or from watchdog based polling.
*
* Parameters:
* wlan - Reference to the driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
static int wlan_transmit(FAR struct wlan_driver_s *wlan)
{
/* Verify that the hardware is ready to send another packet. If we get
* here, then we are committed to sending a packet; Higher level logic
* must have assured that there is not transmission in progress.
*/
/* Increment statistics */
/* Send the packet: address=wlan->wl_dev.d_buf, length=wlan->wl_dev.d_len */
/* Enable Tx interrupts */
/* Setup the TX timeout watchdog (perhaps restarting the timer) */
(void)wd_start(wlan->wl_txtimeout, WLAN_TXTIMEOUT, wlan_txtimeout, 1, (uint32_t)wlan);
return OK;
}
/****************************************************************************
* Function: wlan_uiptxpoll
*
* Description:
* The transmitter is available, check if uIP has any outgoing packets ready
* to send. This is a callback from uip_poll(). uip_poll() may be called:
*
* 1. When the preceding TX packet send is complete,
* 2. When the preceding TX packet send timesout and the interface is reset
* 3. During normal TX polling
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
static int wlan_uiptxpoll(struct uip_driver_s *dev)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)dev->d_private;
/* If the polling resulted in data that should be sent out on the network,
* the field d_len is set to a value > 0.
*/
if (wlan->wl_dev.d_len > 0)
{
uip_arp_out(&wlan->wl_dev);
wlan_transmit(wlan);
/* Check if there is room in the device to hold another packet. If not,
* return a non-zero value to terminate the poll.
*/
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return 0;
}
/****************************************************************************
* Function: wlan_receive
*
* Description:
* An interrupt was received indicating the availability of a new RX packet
*
* Parameters:
* wlan - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by interrupt handling logic.
*
****************************************************************************/
static void wlan_receive(FAR struct wlan_driver_s *wlan)
{
do
{
/* Check for errors and update statistics */
/* Check if the packet is a valid size for the uIP buffer configuration */
/* Copy the data data from the hardware to wlan->wl_dev.d_buf. Set
* amount of data in wlan->wl_dev.d_len
*/
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv6
if (BUF->type == HTONS(UIP_ETHTYPE_IP6))
#else
if (BUF->type == HTONS(UIP_ETHTYPE_IP))
#endif
{
uip_arp_ipin(&wlan->wl_dev);
uip_input(&wlan->wl_dev);
/* If the above function invocation resulted in data that should be
* sent out on the network, the field d_len will set to a value > 0.
*/
if (wlan->wl_dev.d_len > 0)
{
uip_arp_out(&wlan->wl_dev);
wlan_transmit(wlan);
}
}
else if (BUF->type == htons(UIP_ETHTYPE_ARP))
{
uip_arp_arpin(&wlan->wl_dev);
/* If the above function invocation resulted in data that should be
* sent out on the network, the field d_len will set to a value > 0.
*/
if (wlan->wl_dev.d_len > 0)
{
wlan_transmit(wlan);
}
}
}
while (0); /* While there are more packets to be processed */
}
/****************************************************************************
* Function: wlan_txdone
*
* Description:
* An interrupt was received indicating that the last TX packet(s) is done
*
* Parameters:
* wlan - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void wlan_txdone(FAR struct wlan_driver_s *wlan)
{
/* Check for errors and update statistics */
/* If no further xmits are pending, then cancel the TX timeout and
* disable further Tx interrupts.
*/
wd_cancel(wlan->wl_txtimeout);
/* Then poll uIP for new XMIT data */
(void)uip_poll(&wlan->wl_dev, wlan_uiptxpoll);
}
/****************************************************************************
* Function: wlan_interrupt
*
* Description:
* Hardware interrupt handler
*
* Parameters:
* irq - Number of the IRQ that generated the interrupt
* context - Interrupt register state save info (architecture-specific)
*
* Returned Value:
* OK on success
*
* Assumptions:
*
****************************************************************************/
static int wlan_interrupt(int irq, FAR void *context)
{
register FAR struct wlan_driver_s *wlan = &g_wlan1[0];
/* Get and clear interrupt status bits */
/* Handle interrupts according to status bit settings */
/* Check if we received an incoming packet, if so, call wlan_receive() */
wlan_receive(wlan);
/* Check is a packet transmission just completed. If so, call wlan_txdone.
* This may disable further Tx interrupts if there are no pending
* tansmissions.
*/
wlan_txdone(wlan);
return OK;
}
/****************************************************************************
* Function: wlan_txtimeout
*
* Description:
* Our TX watchdog timed out. Called from the timer interrupt handler.
* The last TX never completed. Reset the hardware and start again.
*
* Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void wlan_txtimeout(int argc, uint32_t arg, ...)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)arg;
/* Increment statistics and dump debug info */
/* Then reset the hardware */
/* Then poll uIP for new XMIT data */
(void)uip_poll(&wlan->wl_dev, wlan_uiptxpoll);
}
/****************************************************************************
* Function: wlan_polltimer
*
* Description:
* Periodic timer handler. Called from the timer interrupt handler.
*
* Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void wlan_polltimer(int argc, uint32_t arg, ...)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)arg;
/* Check if there is room in the send another TX packet. We cannot perform
* the TX poll if he are unable to accept another packet for transmission.
*/
/* If so, update TCP timing states and poll uIP for new XMIT data. Hmmm..
* might be bug here. Does this mean if there is a transmit in progress,
* we will missing TCP time state updates?
*/
(void)uip_timer(&wlan->wl_dev, wlan_uiptxpoll, WLAN_POLLHSEC);
/* Setup the watchdog poll timer again */
(void)wd_start(wlan->wl_txpoll, WLAN_WDDELAY, wlan_polltimer, 1, arg);
}
/****************************************************************************
* Function: wlan_ifup
*
* Description:
* NuttX Callback: Bring up the WLAN interface when an IP address is
* provided
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int wlan_ifup(struct uip_driver_s *dev)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)dev->d_private;
ndbg("Bringing up: %d.%d.%d.%d\n",
dev->d_ipaddr & 0xff, (dev->d_ipaddr >> 8) & 0xff,
(dev->d_ipaddr >> 16) & 0xff, dev->d_ipaddr >> 24 );
/* Initialize PHYs, the WLAN interface, and setup up WLAN interrupts */
/* Set and activate a timer process */
(void)wd_start(wlan->wl_txpoll, WLAN_WDDELAY, wlan_polltimer, 1, (uint32_t)wlan);
/* Enable the WLAN interrupt */
wlan->wl_bifup = true;
up_enable_irq(CONFIG_WLAN_IRQ);
return OK;
}
/****************************************************************************
* Function: wlan_ifdown
*
* Description:
* NuttX Callback: Stop the interface.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int wlan_ifdown(struct uip_driver_s *dev)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)dev->d_private;
irqstate_t flags;
/* Disable the WLAN interrupt */
flags = irqsave();
up_disable_irq(CONFIG_WLAN_IRQ);
/* Cancel the TX poll timer and TX timeout timers */
wd_cancel(wlan->wl_txpoll);
wd_cancel(wlan->wl_txtimeout);
/* Put the the EMAC is its reset, non-operational state. This should be
* a known configuration that will guarantee the wlan_ifup() always
* successfully brings the interface back up.
*/
/* Mark the device "down" */
wlan->wl_bifup = false;
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: wlan_txavail
*
* Description:
* Driver callback invoked when new TX data is available. This is a
* stimulus perform an out-of-cycle poll and, thereby, reduce the TX
* latency.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Called in normal user mode
*
****************************************************************************/
static int wlan_txavail(struct uip_driver_s *dev)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)dev->d_private;
irqstate_t flags;
/* Disable interrupts because this function may be called from interrupt
* level processing.
*/
flags = irqsave();
/* Ignore the notification if the interface is not yet up */
if (wlan->wl_bifup)
{
/* Check if there is room in the hardware to hold another outgoing packet. */
/* If so, then poll uIP for new XMIT data */
(void)uip_poll(&wlan->wl_dev, wlan_uiptxpoll);
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: wlan_addmac
*
* Description:
* NuttX Callback: Add the specified MAC address to the hardware multicast
* address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be added
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static int wlan_addmac(struct uip_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
return OK;
}
#endif
/****************************************************************************
* Function: wlan_rmmac
*
* Description:
* NuttX Callback: Remove the specified MAC address from the hardware multicast
* address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be removed
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static int wlan_rmmac(struct uip_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct wlan_driver_s *wlan = (FAR struct wlan_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
return OK;
}
#endif
/****************************************************************************
* Function: wlan_initialize
*
* Description:
* Initialize the WLAN controller and driver
*
* Parameters:
* intf - In the case where there are multiple EMACs, this value
* identifies which EMAC is to be initialized.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static int wlan_initialize(int intf)
{
struct wlan_driver_s *priv;
/* Get the interface structure associated with this interface number. */
DEBUGASSERT(intf < CONFIG_WLAN_NINTERFACES);
priv = &g_wlan1[intf];
/* Check if a WLAN chip is recognized at its I/O base */
/* Attach the IRQ to the driver */
#if 0 /* @TODO resolve this */
if (irq_attach(CONFIG_WLAN_IRQ, wlan_interrupt))
{
/* We could not attach the ISR to the the interrupt */
return -EAGAIN;
}
#endif
/* Initialize the driver structure */
memset(priv, 0, sizeof(struct wlan_driver_s));
priv->wl_dev.d_ifup = wlan_ifup; /* I/F down callback */
priv->wl_dev.d_ifdown = wlan_ifdown; /* I/F up (new IP address) callback */
priv->wl_dev.d_txavail = wlan_txavail; /* New TX data callback */
#ifdef CONFIG_NET_IGMP
priv->wl_dev.d_addmac = wlan_addmac; /* Add multicast MAC address */
priv->wl_dev.d_rmmac = wlan_rmmac; /* Remove multicast MAC address */
#endif
priv->wl_dev.d_private = (void*)g_wlan1; /* Used to recover private state from dev */
/* Create a watchdog for timing polling for and timing of transmisstions */
priv->wl_txpoll = wd_create(); /* Create periodic poll timer */
priv->wl_txtimeout = wd_create(); /* Create TX timeout timer */
/* Put the interface in the down state. This usually amounts to resetting
* the device and/or calling wlan_ifdown().
*/
/* Read the MAC address from the hardware into priv->wl_dev.d_mac.ether_addr_octet */
/* Register the device with the OS so that socket IOCTLs can be performed */
(void)netdev_register(&priv->wl_dev);
return OK;
}
/****************************************************************************
* Function: wlan_initialize
*
* Description:
* Initialize the WLAN controller and driver
*
* Parameters:
* intf - In the case where there are multiple EMACs, this value
* identifies which EMAC is to be initialized.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static int wlan_uninitialize(int intf)
{
struct wlan_driver_s *priv;
/* Get the interface structure associated with this interface number. */
DEBUGASSERT(intf < CONFIG_WLAN_NINTERFACES);
priv = &g_wlan1[intf];
/* Check if a WLAN chip is recognized at its I/O base */
/* Detach the IRQ from the driver */
// irq_detach(CONFIG_WLAN_IRQ); /* @TODO enable this code */
/* Unregister the device */
// (void)netdev_unregister(&priv->wl_dev); /* @TODO implement this */
/* Uninitialize the driver structure */
memset(priv, 0, sizeof(struct wlan_driver_s));
return OK;
}
#endif /* CONFIG_NET && CONFIG_NET_WLAN */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usbhost_wlaninit
*
* 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 Values:
* On success this function will return zero (OK); A negated errno value
* will be returned on failure.
*
****************************************************************************/
int usbhost_wlaninit(void)
{
/* Perform any one-time initialization of the class implementation */
/* Advertise our availability to support (certain) devices */
return usbhost_registerclass(&g_wlan);
}
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