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incubator-nuttx/wireless/ieee802154/mac802154_device.c

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/****************************************************************************
* wireless/ieee802154/mac802154_device.c
*
* Copyright (C) 2017 Verge Inc. All rights reserved.
* Author: Anthony Merlino <anthony@vergeaero.com>
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <fcntl.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/signal.h>
#include <nuttx/mm/iob.h>
#include <nuttx/wireless/ieee802154/ieee802154_device.h>
#include <nuttx/wireless/ieee802154/ieee802154_mac.h>
#include "mac802154.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Device naming ************************************************************/
#define DEVNAME_FMT "/dev/ieee%d"
#define DEVNAME_FMTLEN (9 + 3 + 1)
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure describes the state of one open mac driver instance */
struct mac802154dev_open_s
{
/* Supports a singly linked list */
FAR struct mac802154dev_open_s *md_flink;
/* The following will be true if we are closing */
volatile bool md_closing;
};
struct mac802154dev_callback_s
{
/* This holds the information visible to the MAC layer */
struct mac802154_maccb_s mc_cb; /* Interface understood by the MAC layer */
FAR struct mac802154_chardevice_s *mc_priv; /* Our priv data */
};
struct mac802154_chardevice_s
{
MACHANDLE md_mac; /* Saved binding to the mac layer */
struct mac802154dev_callback_s md_cb; /* Callback information */
sem_t md_exclsem; /* Exclusive device access */
/* Hold a list of events */
bool enableevents : 1; /* Are events enabled? */
bool geteventpending : 1; /* Is there a get event using the semaphore? */
sem_t geteventsem; /* Signaling semaphore for waiting get event */
sq_queue_t primitive_queue; /* For holding primitives to pass along */
/* The following is a singly linked list of open references to the
* MAC device.
*/
FAR struct mac802154dev_open_s *md_open;
/* Hold a list of transactions as a "readahead" buffer */
bool readpending; /* Is there a read using the semaphore? */
sem_t readsem; /* Signaling semaphore for waiting read */
sq_queue_t dataind_queue;
#ifndef CONFIG_DISABLE_SIGNALS
/* MAC Service notification information */
bool md_notify_registered;
uint8_t md_notify_signo;
pid_t md_notify_pid;
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Semaphore helpers */
static inline int mac802154dev_takesem(sem_t *sem);
#define mac802154dev_givesem(s) nxsem_post(s);
static int mac802154dev_notify(FAR struct mac802154_maccb_s *maccb,
FAR struct ieee802154_primitive_s *primitive);
static int mac802154dev_rxframe(FAR struct mac802154_chardevice_s *dev,
FAR struct ieee802154_data_ind_s *ind);
static int mac802154dev_open(FAR struct file *filep);
static int mac802154dev_close(FAR struct file *filep);
static ssize_t mac802154dev_read(FAR struct file *filep, FAR char *buffer,
size_t len);
static ssize_t mac802154dev_write(FAR struct file *filep,
FAR const char *buffer, size_t len);
static int mac802154dev_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations mac802154dev_fops =
{
mac802154dev_open , /* open */
mac802154dev_close, /* close */
mac802154dev_read , /* read */
mac802154dev_write, /* write */
NULL, /* seek */
mac802154dev_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, NULL /* poll */
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, NULL /* unlink */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mac802154dev_semtake
*
* Description:
* Acquire the semaphore used for access serialization.
*
****************************************************************************/
static inline int mac802154dev_takesem(sem_t *sem)
{
int ret;
/* Take the semaphore (perhaps waiting) */
ret = nxsem_wait(sem);
/* The only case that an error should occur here is if the wait were
* awakened by a signal.
*/
DEBUGASSERT(ret == OK || ret == -EINTR);
return ret;
}
/****************************************************************************
* Name: mac802154dev_open
*
* Description:
* Open the 802.15.4 MAC character device.
*
****************************************************************************/
static int mac802154dev_open(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct mac802154_chardevice_s *dev;
FAR struct mac802154dev_open_s *opriv;
int ret;
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
inode = filep->f_inode;
dev = inode->i_private;
DEBUGASSERT(dev != NULL);
/* Get exclusive access to the MAC driver data structure */
ret = mac802154dev_takesem(&dev->md_exclsem);
if (ret < 0)
{
wlerr("ERROR: mac802154dev_takesem failed: %d\n", ret);
return ret;
}
/* Allocate a new open struct */
opriv = (FAR struct mac802154dev_open_s *)
kmm_zalloc(sizeof(struct mac802154dev_open_s));
if (!opriv)
{
wlerr("ERROR: Failed to allocate new open struct\n");
ret = -ENOMEM;
goto errout_with_sem;
}
/* Attach the open struct to the device */
opriv->md_flink = dev->md_open;
dev->md_open = opriv;
/* Attach the open struct to the file structure */
filep->f_priv = (FAR void *)opriv;
ret = OK;
errout_with_sem:
mac802154dev_givesem(&dev->md_exclsem);
return ret;
}
/****************************************************************************
* Name: mac802154dev_close
*
* Description:
* Close the 802.15.4 MAC character device.
*
****************************************************************************/
static int mac802154dev_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct mac802154_chardevice_s *dev;
FAR struct mac802154dev_open_s *opriv;
FAR struct mac802154dev_open_s *curr;
FAR struct mac802154dev_open_s *prev;
irqstate_t flags;
bool closing;
int ret;
DEBUGASSERT(filep && filep->f_priv && filep->f_inode);
opriv = filep->f_priv;
inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
dev = (FAR struct mac802154_chardevice_s *)inode->i_private;
/* Handle an improbable race conditions with the following atomic test
* and set.
*
* This is actually a pretty feeble attempt to handle this. The
* improbable race condition occurs if two different threads try to
* close the driver at the same time. The rule: don't do
* that! It is feeble because we do not really enforce stale pointer
* detection anyway.
*/
flags = enter_critical_section();
closing = opriv->md_closing;
opriv->md_closing = true;
leave_critical_section(flags);
if (closing)
{
/* Another thread is doing the close */
return OK;
}
/* Get exclusive access to the driver structure */
ret = mac802154dev_takesem(&dev->md_exclsem);
if (ret < 0)
{
wlerr("ERROR: mac802154_takesem failed: %d\n", ret);
return ret;
}
/* Find the open structure in the list of open structures for the device */
for (prev = NULL, curr = dev->md_open;
curr && curr != opriv;
prev = curr, curr = curr->md_flink);
DEBUGASSERT(curr);
if (!curr)
{
wlerr("ERROR: Failed to find open entry\n");
ret = -ENOENT;
goto errout_with_exclsem;
}
/* Remove the structure from the device */
if (prev)
{
prev->md_flink = opriv->md_flink;
}
else
{
dev->md_open = opriv->md_flink;
}
/* And free the open structure */
kmm_free(opriv);
/* If there are now no open instances of the driver and a signal handler is
* not registered, purge the list of events.
*/
if (dev->md_open)
{
FAR struct ieee802154_primitive_s *primitive;
primitive =
(FAR struct ieee802154_primitive_s *)sq_remfirst(&dev->primitive_queue);
while (primitive)
{
ieee802154_primitive_free(primitive);
primitive =
(FAR struct ieee802154_primitive_s *)sq_remfirst(&dev->primitive_queue);
}
}
ret = OK;
errout_with_exclsem:
mac802154dev_givesem(&dev->md_exclsem);
return ret;
}
/****************************************************************************
* Name: mac802154dev_read
*
* Description:
* Return the last received packet.
*
****************************************************************************/
static ssize_t mac802154dev_read(FAR struct file *filep, FAR char *buffer,
size_t len)
{
FAR struct inode *inode;
FAR struct mac802154_chardevice_s *dev;
FAR struct mac802154dev_rxframe_s *rx;
FAR struct ieee802154_data_ind_s *ind;
struct ieee802154_get_req_s req;
int ret;
DEBUGASSERT(filep && filep->f_inode);
inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
dev = (FAR struct mac802154_chardevice_s *)inode->i_private;
/* Check to make sure the buffer is the right size for the struct */
if (len != sizeof(struct mac802154dev_rxframe_s))
{
wlerr("ERROR: buffer isn't a mac802154dev_rxframe_s: %lu\n",
(unsigned long)len);
return -EINVAL;
}
DEBUGASSERT(buffer != NULL);
rx = (FAR struct mac802154dev_rxframe_s *)buffer;
while (1)
{
/* Get exclusive access to the driver structure */
ret = mac802154dev_takesem(&dev->md_exclsem);
if (ret < 0)
{
wlerr("ERROR: mac802154dev_takesem failed: %d\n", ret);
return ret;
}
/* Try popping a data indication off the list */
ind = (FAR struct ieee802154_data_ind_s *)sq_remfirst(&dev->dataind_queue);
/* If the indication is not null, we can exit the loop and copy the data */
if (ind != NULL)
{
mac802154dev_givesem(&dev->md_exclsem);
break;
}
/* If this is a non-blocking call, or if there is another read operation
* already pending, don't block. This driver returns EAGAIN even when
* configured as non-blocking if another read operation is already pending
* This situation should be rare. It will only occur when there are 2 calls
* to read from separate threads and there was no data in the rx list.
*/
if ((filep->f_oflags & O_NONBLOCK) || dev->readpending)
{
mac802154dev_givesem(&dev->md_exclsem);
return -EAGAIN;
}
dev->readpending = true;
mac802154dev_givesem(&dev->md_exclsem);
/* Wait to be signaled when a frame is added to the list */
ret = nxsem_wait(&dev->readsem);
if (ret < 0)
{
DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
dev->readpending = false;
return ret;
}
/* Let the loop wrap back around, we will then pop a indication and this
* time, it should have a data indication
*/
}
/* Check if the MAC layer is in promiscuous mode. If it is, pass the entire
* frame, including IEEE 802.15.4 header and checksum by assuming the frame
* starts at the beginning of the IOB and goes 2 past the length to account
* for the FCS that the radio driver "removes"
*/
req.attr = IEEE802154_ATTR_MAC_PROMISCUOUS_MODE;
ret = mac802154_ioctl(dev->md_mac, MAC802154IOC_MLME_GET_REQUEST,
(unsigned long)&req);
if (ret == 0 && req.attrval.mac.promisc_mode)
{
rx->length = ind->frame->io_len + 2;
rx->offset = ind->frame->io_offset;
/* Copy the entire frame from the IOB to the user supplied struct */
memcpy(&rx->payload[0], &ind->frame->io_data[0], rx->length);
}
else
{
rx->length = (ind->frame->io_len - ind->frame->io_offset);
rx->offset = 0;
/* Copy just the payload from the IOB to the user supplied struct */
memcpy(&rx->payload[0], &ind->frame->io_data[ind->frame->io_offset],
rx->length);
}
memcpy(&rx->meta, ind, sizeof(struct ieee802154_data_ind_s));
/* Zero out the forward link and IOB reference */
rx->meta.flink = NULL;
rx->meta.frame = NULL;
/* Free the IOB */
iob_free(ind->frame);
/* Deallocate the data indication */
ieee802154_primitive_free((FAR struct ieee802154_primitive_s *)ind);
return OK;
}
/****************************************************************************
* Name: mac802154dev_write
*
* Description:
* Send a packet over the IEEE802.15.4 network.
*
****************************************************************************/
static ssize_t mac802154dev_write(FAR struct file *filep,
FAR const char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct mac802154_chardevice_s *dev;
FAR struct mac802154dev_txframe_s *tx;
FAR struct iob_s *iob;
int ret;
DEBUGASSERT(filep && filep->f_inode);
inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
dev = (FAR struct mac802154_chardevice_s *)inode->i_private;
/* Check if the struct is the correct size */
if (len != sizeof(struct mac802154dev_txframe_s))
{
wlerr("ERROR: buffer isn't a mac802154dev_txframe_s: %lu\n",
(unsigned long)len);
return -EINVAL;
}
DEBUGASSERT(buffer != NULL);
tx = (FAR struct mac802154dev_txframe_s *)buffer;
/* Allocate an IOB to put the frame in */
iob = iob_alloc(false);
DEBUGASSERT(iob != NULL);
iob->io_flink = NULL;
iob->io_len = 0;
iob->io_offset = 0;
iob->io_pktlen = 0;
/* Get the MAC header length */
ret = mac802154_get_mhrlen(dev->md_mac, &tx->meta);
if (ret < 0)
{
wlerr("ERROR: TX meta-data is invalid");
return ret;
}
iob->io_offset = ret;
iob->io_len = iob->io_offset;
memcpy(&iob->io_data[iob->io_offset], tx->payload, tx->length);
iob->io_len += tx->length;
/* Pass the request to the MAC layer */
ret = mac802154_req_data(dev->md_mac, &tx->meta, iob);
if (ret < 0)
{
iob_free(iob);
wlerr("ERROR: req_data failed %d\n", ret);
return ret;
}
return OK;
}
/****************************************************************************
* Name: mac802154dev_ioctl
*
* Description:
* Control the MAC layer via IOCTL commands.
*
****************************************************************************/
static int mac802154dev_ioctl(FAR struct file *filep, int cmd,
unsigned long arg)
{
FAR struct inode *inode;
FAR struct mac802154_chardevice_s *dev;
FAR union ieee802154_macarg_u *macarg =
(FAR union ieee802154_macarg_u *)((uintptr_t)arg);
int ret;
DEBUGASSERT(filep != NULL && filep->f_priv != NULL &&
filep->f_inode != NULL);
inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
dev = (FAR struct mac802154_chardevice_s *)inode->i_private;
/* Get exclusive access to the driver structure */
ret = mac802154dev_takesem(&dev->md_exclsem);
if (ret < 0)
{
wlerr("ERROR: mac802154dev_takesem failed: %d\n", ret);
return ret;
}
switch (cmd)
{
#ifndef CONFIG_DISABLE_SIGNALS
/* Command: MAC802154IOC_NOTIFY_REGISTER
* Description: Register to receive a signal whenever there is a
* event primitive sent from the MAC layer.
* Argument: The signal number to use.
* Return: Zero (OK) on success. Minus one will be returned on
* failure with the errno value set appropriately.
*/
case MAC802154IOC_NOTIFY_REGISTER:
{
/* Save the notification events */
dev->md_notify_signo = macarg->signo;
dev->md_notify_pid = getpid();
dev->md_notify_registered = true;
ret = OK;
}
break;
#endif
case MAC802154IOC_GET_EVENT:
{
FAR struct ieee802154_primitive_s *primitive;
while (1)
{
/* Try popping an event off the queue */
primitive = (FAR struct ieee802154_primitive_s *)
sq_remfirst(&dev->primitive_queue);
/* If there was an event to pop off, copy it into the user data and
* free it from the MAC layer's memory.
*/
if (primitive != NULL)
{
memcpy(&macarg->primitive, primitive, sizeof(struct ieee802154_primitive_s));
/* Free the notification */
ieee802154_primitive_free(primitive);
ret = OK;
break;
}
/* If this is a non-blocking call, or if there is another getevent
* operation already pending, don't block. This driver returns
* EAGAIN even when configured as non-blocking if another getevent
* operation is already pending This situation should be rare.
* It will only occur when there are 2 calls from separate threads
* and there was no events in the queue.
*/
if ((filep->f_oflags & O_NONBLOCK) || dev->geteventpending)
{
ret = -EAGAIN;
break;
}
dev->geteventpending = true;
mac802154dev_givesem(&dev->md_exclsem);
/* Wait to be signaled when an event is queued */
ret = nxsem_wait(&dev->geteventsem);
if (ret < 0)
{
DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
dev->geteventpending = false;
return ret;
}
/* Get exclusive access again, then loop back around and try and
* pop an event off the queue
*/
ret = mac802154dev_takesem(&dev->md_exclsem);
if (ret < 0)
{
wlerr("ERROR: mac802154dev_takesem failed: %d\n", ret);
return ret;
}
}
}
break;
case MAC802154IOC_ENABLE_EVENTS:
{
dev->enableevents = macarg->enable;
ret = OK;
}
break;
default:
{
/* Forward any unrecognized commands to the MAC layer */
ret = mac802154_ioctl(dev->md_mac, cmd, arg);
}
break;
}
mac802154dev_givesem(&dev->md_exclsem);
return ret;
}
static int mac802154dev_notify(FAR struct mac802154_maccb_s *maccb,
FAR struct ieee802154_primitive_s *primitive)
{
FAR struct mac802154dev_callback_s *cb =
(FAR struct mac802154dev_callback_s *)maccb;
FAR struct mac802154_chardevice_s *dev;
DEBUGASSERT(cb != NULL && cb->mc_priv != NULL);
dev = cb->mc_priv;
/* Handle the special case for data indications or "incoming frames" */
if (primitive->type == IEEE802154_PRIMITIVE_IND_DATA)
{
return mac802154dev_rxframe(dev, &primitive->u.dataind);
}
/* If there is a registered notification receiver, queue the event and signal
* the receiver. Events should be popped from the queue from the application
* at a reasonable rate in order for the MAC layer to be able to allocate new
* notifications.
*/
if (dev->enableevents && (dev->md_open != NULL || dev->md_notify_registered))
{
/* Get exclusive access to the driver structure. We don't care about any
* signals so if we see one, just go back to trying to get access again */
while (mac802154dev_takesem(&dev->md_exclsem) != 0);
sq_addlast((FAR sq_entry_t *)primitive, &dev->primitive_queue);
/* Check if there is a read waiting for data */
if (dev->geteventpending)
{
/* Wake the thread waiting for the data transmission */
dev->geteventpending = false;
nxsem_post(&dev->geteventsem);
}
#ifndef CONFIG_DISABLE_SIGNALS
if (dev->md_notify_registered)
{
#ifdef CONFIG_CAN_PASS_STRUCTS
union sigval value;
value.sival_int = (int)primitive->type;
(void)nxsig_queue(dev->md_notify_pid, dev->md_notify_signo,
value);
#else
(void)nxsig_queue(dev->md_notify_pid, dev->md_notify_signo,
(FAR void *)primitive->type);
#endif
}
#endif
mac802154dev_givesem(&dev->md_exclsem);
return OK;
}
/* By returning a negative value, we let the MAC know that we don't want the
* primitive and it will free it for us
*/
return -1;
}
/****************************************************************************
* Name: mac802154dev_rxframe
*
* Description:
* Handle received frames forward by the IEEE 802.15.4 MAC.
*
* Returned Value:
* any failure. On success, the ind and its contained iob will be freed.
* The ind will be intact if this function returns a failure.
*
****************************************************************************/
static int mac802154dev_rxframe(FAR struct mac802154_chardevice_s *dev,
FAR struct ieee802154_data_ind_s *ind)
{
/* Get exclusive access to the driver structure. We don't care about any
* signals so if we see one, just go back to trying to get access again */
while (mac802154dev_takesem(&dev->md_exclsem) != 0);
/* Push the indication onto the list */
sq_addlast((FAR sq_entry_t *)ind, &dev->dataind_queue);
/* Check if there is a read waiting for data */
if (dev->readpending)
{
/* Wake the thread waiting for the data transmission */
dev->readpending = false;
nxsem_post(&dev->readsem);
}
/* Release the driver */
mac802154dev_givesem(&dev->md_exclsem);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mac802154dev_register
*
* Description:
* Register a character driver to access the IEEE 802.15.4 MAC layer from
* user-space
*
* Input Parameters:
* mac - Pointer to the mac layer struct to be registerd.
* minor - The device minor number. The IEEE802.15.4 MAC character device
* will be registered as /dev/ieeeN where N is the minor number
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
int mac802154dev_register(MACHANDLE mac, int minor)
{
FAR struct mac802154_chardevice_s *dev;
FAR struct mac802154_maccb_s *maccb;
char devname[DEVNAME_FMTLEN];
int ret;
dev = kmm_zalloc(sizeof(struct mac802154_chardevice_s));
if (!dev)
{
wlerr("ERROR: Failed to allocate device structure\n");
return -ENOMEM;
}
/* Initialize the new mac driver instance */
dev->md_mac = mac;
nxsem_init(&dev->md_exclsem, 0, 1); /* Allow the device to be opened once
* before blocking */
nxsem_init(&dev->readsem, 0, 0);
nxsem_setprotocol(&dev->readsem, SEM_PRIO_NONE);
dev->readpending = false;
sq_init(&dev->dataind_queue);
dev->geteventpending = false;
nxsem_init(&dev->geteventsem, 0, 0);
nxsem_setprotocol(&dev->geteventsem, SEM_PRIO_NONE);
sq_init(&dev->primitive_queue);
dev->enableevents = true;
dev->md_notify_registered = false;
/* Initialize the MAC callbacks */
dev->md_cb.mc_priv = dev;
maccb = &dev->md_cb.mc_cb;
maccb->flink = NULL;
maccb->prio = CONFIG_IEEE802154_MACDEV_RECVRPRIO;
maccb->notify = mac802154dev_notify;
/* Bind the callback structure */
ret = mac802154_bind(mac, maccb);
if (ret < 0)
{
nerr("ERROR: Failed to bind the MAC callbacks: %d\n", ret);
/* Free memory and return the error */
kmm_free(dev);
return ret;
}
/* Create the character device name */
snprintf(devname, DEVNAME_FMTLEN, DEVNAME_FMT, minor);
/* Register the mac character driver */
ret = register_driver(devname, &mac802154dev_fops, 0666, dev);
if (ret < 0)
{
wlerr("ERROR: register_driver failed: %d\n", ret);
goto errout_with_priv;
}
return OK;
errout_with_priv:
nxsem_destroy(&dev->md_exclsem);
kmm_free(dev);
return ret;
}
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