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85e90b0064
nuttx/drivers/wireless/cc3000/cc3000.c
Gregory Nutt 85e90b0064 Updated CC3000 driver from David Sidrane
2013-10-30 14:37:13 -06:00

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/****************************************************************************
* drivers/wireless/cc3000.c
*
* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
* David_s5 <david_s5@nscdg.com>
*
* References:
* CC30000 from Texas Instruments http://processors.wiki.ti.com/index.php/CC3000
*
* See also:
* http://processors.wiki.ti.com/index.php/CC3000_Host_Driver_Porting_Guide
* http://processors.wiki.ti.com/index.php/CC3000_Host_Programming_Guide
*
* 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 <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <poll.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/clock.h>
#include <nuttx/arch.h>
#include <nuttx/fs/fs.h>
#include <nuttx/spi/spi.h>
#include <arpa/inet.h>
#include <nuttx/wireless/wireless.h>
#include <nuttx/wireless/cc3000.h>
#include <nuttx/wireless/cc3000/include/cc3000_upif.h>
#include <nuttx/wireless/cc3000/cc3000_common.h>
#include <nuttx/wireless/cc3000/hci.h>
#include "cc3000_socket.h"
#include "cc3000.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#if CC3000_RX_BUFFER_SIZE > CONFIG_MQ_MAXMSGSIZE
#error "CONFIG_MQ_MAXMSGSIZE needs to be >= CC3000_RX_BUFFER_SIZE"
#endif
#ifndef CONFIG_CC3000_WORKER_THREAD_PRIORITY
# define CONFIG_CC3000_WORKER_THREAD_PRIORITY (SCHED_PRIORITY_MAX)
#endif
#ifndef CONFIG_CC3000_WORKER_STACKSIZE
# define CONFIG_CC3000_WORKER_STACKSIZE 240
#endif
#ifndef CONFIG_CC3000_SELECT_THREAD_PRIORITY
# define CONFIG_CC3000_SELECT_THREAD_PRIORITY (SCHED_PRIORITY_DEFAULT+10)
#endif
#ifndef CONFIG_CC3000_SELECT_STACKSIZE
# define CONFIG_CC3000_SELECT_STACKSIZE 368
#endif
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
#define NUMBER_OF_MSGS 1
#define FREE_SLOT -1
#if defined(CONFIG_CC3000_PROBES)
# define CC3000_GUARD (0xc35aa53c)
# define INIT_GUARD(p) p->guard = CC3000_GUARD
# define CHECK_GUARD(p) DEBUGASSERT(p->guard == CC3000_GUARD)
# define PROBE(pin,state) priv->config->probe(priv->config,pin, state)
#else
# define INIT_GUARD(p)
# define CHECK_GUARD(p)
# define PROBE(pin,state)
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Low-level SPI helpers */
static void cc3000_lock_and_select(FAR struct spi_dev_s *spi);
static void cc3000_deselect_and_unlock(FAR struct spi_dev_s *spi);
/* Interrupts and data sampling */
static void cc3000_notify(FAR struct cc3000_dev_s *priv);
static void *cc3000_worker(FAR void *arg);
static int cc3000_interrupt(int irq, FAR void *context);
/* Character driver methods */
static int cc3000_open(FAR struct file *filep);
static int cc3000_close(FAR struct file *filep);
static ssize_t cc3000_read(FAR struct file *filep, FAR char *buffer,
size_t len);
static ssize_t cc3000_write(FAR struct file *filep,
FAR const char *buffer, size_t len);
static int cc3000_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
#ifndef CONFIG_DISABLE_POLL
static int cc3000_poll(FAR struct file *filep, struct pollfd *fds,
bool setup);
#endif
static int cc3000_wait_data(FAR struct cc3000_dev_s *priv, int sockfd);
static int cc3000_accept_socket(FAR struct cc3000_dev_s *priv, int sd,
FAR struct sockaddr *addr,
socklen_t *addrlen);
static int cc3000_add_socket(FAR struct cc3000_dev_s *priv, int sd);
static int cc3000_remove_socket(FAR struct cc3000_dev_s *priv, int sd);
/****************************************************************************
* Private Data
****************************************************************************/
/* This the vtable that supports the character driver interface */
static const struct file_operations cc3000_fops =
{
cc3000_open, /* open */
cc3000_close, /* close */
cc3000_read, /* read */
cc3000_write, /* write */
0, /* seek */
cc3000_ioctl, /* ioctl */
#ifndef CONFIG_DISABLE_POLL
cc3000_poll /* poll */
#endif
};
/* If only a single CC3000 device is supported, then the driver state
* structure may as well be pre-allocated.
*/
#ifndef CONFIG_CC3000_MULTIPLE
static struct cc3000_dev_s g_cc3000;
/* Otherwise, we will need to maintain allocated driver instances in a list */
#else
static struct cc3000_dev_s *g_cc3000list;
#endif
uint8_t spi_readCommand[] = READ_COMMAND;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: cc3000_devtake() and cc3000_devgive()
*
* Description:
* Used to get exclusive access to a CC3000 driver.
*
****************************************************************************/
static int cc3000_devtake(FAR struct cc3000_dev_s *priv)
{
int rv;
/* Take the semaphore (perhaps waiting) */
while ((rv = sem_wait(&priv->devsem)) != 0)
{
/* The only case that an error should occur here is if the wait was awakened
* by a signal.
*/
DEBUGASSERT(rv == OK || errno == EINTR);
}
return rv;
}
static inline int cc3000_devgive(FAR struct cc3000_dev_s *priv)
{
return sem_post(&priv->devsem);
}
/************************************************************************************
* Name: usdelay()
*
* Description:
* timeout = the time out is uS
*
************************************************************************************/
static void usdelay(long ustimeout)
{
volatile int j;
ustimeout = 1 + (ustimeout * CONFIG_BOARD_LOOPSPERMSEC)/1000;
for (j = 0; j < ustimeout; j++)
{
}
}
/****************************************************************************
* Function: cc3000_configspi
*
* Description:
* Configure the SPI for use with the CC3000. This function should be
* called to configure the SPI
* bus.
*
* Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static inline void cc3000_configspi(FAR struct spi_dev_s *spi)
{
idbg("Mode: %d Bits: 8 Frequency: %d\n",
CONFIG_CC3000_SPIMODE, CONFIG_CC3000_SPI_FREQUENCY);
SPI_SETMODE(spi, CONFIG_CC3000_SPIMODE);
SPI_SETBITS(spi, 8);
SPI_SETFREQUENCY(spi, CONFIG_CC3000_SPI_FREQUENCY);
}
/****************************************************************************
* Function: cc3000_lock
*
* Description:
* Lock the SPI bus and re-configure as necessary. This function must be
* to assure: (1) exclusive access to the SPI bus, and (2) to assure that
* the shared bus is properly configured for the cc3000 module.
*
* Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void cc3000_lock_and_select(FAR struct spi_dev_s *spi)
{
#ifndef CONFIG_SPI_OWNBUS
/* Lock the SPI bus because there are multiple devices competing for the
* SPI bus
*/
/* Lock the SPI bus so that we have exclusive access */
(void)SPI_LOCK(spi, true);
#endif
/* We have the lock. Now make sure that the SPI bus is configured for the
* CC3000 (it might have gotten configured for a different device while
* unlocked)
*/
cc3000_configspi(spi);
SPI_SELECT(spi, SPIDEV_WIRELESS, true);
}
/****************************************************************************
* Function: cc3000_unlock
*
* Description:
* If we are sharing the SPI bus with other devices (CONFIG_SPI_OWNBUS
* undefined) then we need to un-lock the SPI bus for each transfer,
* possibly losing the current configuration.
*
* Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void cc3000_deselect_and_unlock(FAR struct spi_dev_s *spi)
{
/* De select */
SPI_SELECT(spi, SPIDEV_WIRELESS, false);
#ifndef CONFIG_SPI_OWNBUS
/* Relinquish the SPI bus. */
(void)SPI_LOCK(spi, false);
#endif
}
/****************************************************************************
* Function: cc3000_wait
*
* Description:
* Helper function to wait on the semaphore signaled by the
*
* Parameters:
* priv - Reference to the CC3000 driver structure
* priv -
*
* Returned Value:
* 0 - Semaphore signaled and devsem retaken
* < 0 - Some Error occurred
* Assumptions:
* Own the devsem on entry
*
****************************************************************************/
static int cc3000_wait(FAR struct cc3000_dev_s *priv, sem_t* psem)
{
int ret;
/* Give up */
sched_lock();
cc3000_devgive(priv);
/* Wait on first psem to become signaled */
ret = sem_wait(psem);
if (ret >= 0)
{
/* Yes... then retake the mutual exclusion semaphore */
ret = cc3000_devtake(priv);
}
sched_unlock();
/* Was the semaphore wait successful? Did we successful re-take the
* mutual exclusion semaphore?
*/
if (ret < 0)
{
/* No.. One of the two sem_wait's failed. */
ret = -errno;
}
return ret;
}
/****************************************************************************
* Function: cc3000_wait_irq
*
* Description:
* Helper function to wait on the irqsem signaled by the interrupt
*
* Parameters:
* priv - Reference to the CC3000 driver structure
*
* Returned Value:
* 0 - Semaphore signaled and devsem retaken
* < 0 - Some Error occurred
* Assumptions:
* Own the devsem on entry
*
****************************************************************************/
static inline int cc3000_wait_irq(FAR struct cc3000_dev_s *priv)
{
return cc3000_wait(priv,&priv->irqsem);
}
/****************************************************************************
* Function: cc3000_wait_ready
*
* Description:
* Helper function to wait on the readysem signaled by the interrupt
*
* Parameters:
* priv - Reference to the CC3000 driver structure
*
* Returned Value:
* 0 - Semaphore signaled and devsem retaken
* < 0 - Some Error occurred
* Assumptions:
* Own the devsem on entry
*
****************************************************************************/
static inline int cc3000_wait_ready(FAR struct cc3000_dev_s *priv)
{
return cc3000_wait(priv,&priv->readysem);
}
/****************************************************************************
* Name: cc3000_notify
****************************************************************************/
static void cc3000_notify(FAR struct cc3000_dev_s *priv)
{
#ifndef CONFIG_DISABLE_POLL
int i;
#endif
/* If there are threads waiting for read data, then signal one of them
* that the read data is available.
*/
if (priv->nwaiters > 0)
{
/* After posting this semaphore, we need to exit because the CC3000
* is no longer available.
*/
sem_post(&priv->waitsem);
}
/* If there are threads waiting on poll() for CC3000 data to become available,
* then wake them up now. NOTE: we wake up all waiting threads because we
* do not know that they are going to do. If they all try to read the data,
* then some make end up blocking after all.
*/
#ifndef CONFIG_DISABLE_POLL
for (i = 0; i < CONFIG_CC3000_NPOLLWAITERS; i++)
{
struct pollfd *fds = priv->fds[i];
if (fds)
{
fds->revents |= POLLIN;
nllvdbg("Report events: %02x\n", fds->revents);
sem_post(fds->sem);
}
}
#endif
}
/****************************************************************************
* Name: cc3000_worker
****************************************************************************/
static void * select_thread_func(FAR void *arg)
{
FAR struct cc3000_dev_s *priv = (FAR struct cc3000_dev_s *)arg;
struct timeval timeout;
TICC3000fd_set readsds;
int ret = 0;
int maxFD = 0;
int s = 0;
memset(&timeout, 0, sizeof(struct timeval));
timeout.tv_sec = 0;
timeout.tv_usec = (100); /* .1 msecs */
while (1)
{
sem_wait(&priv->selectsem);
CHECK_GUARD(priv);
/* Increase the count back by one to be decreased by the original caller */
sem_post(&priv->selectsem);
CC3000_FD_ZERO(&readsds);
/* Ping correct socket descriptor param for select */
for (s = 0; s < CONFIG_WL_MAX_SOCKETS; s++)
{
if (priv->sockets[s].sd != FREE_SLOT)
{
CC3000_FD_SET(priv->sockets[s].sd, &readsds);
if (maxFD <= priv->sockets[s].sd)
{
maxFD = priv->sockets[s].sd + 1;
}
}
}
/* Polling instead of blocking here to process "accept" below */
ret = cc3000_select(maxFD, (fd_set *) &readsds, NULL, NULL, &timeout);
if (priv->selecttid == -1)
{
/* driver close will terminate the thread and by that all sync
* objects owned by it will be released
*/
return OK;
}
if (ret > 0)
{
for (s = 0; s < CONFIG_WL_MAX_SOCKETS; s++)
{
if (priv->sockets[s].sd != FREE_SLOT && /* Check that the socket is valid */
priv->sockets[s].sd != priv->accepting_socket.acc.sd && /* Verify this is not an accept socket */
CC3000_FD_ISSET(priv->sockets[s].sd, &readsds)) /* and has pending data */
{
sem_post(&priv->sockets[s].semwait); /* release the waiting thread */
}
}
}
if (priv->accepting_socket.acc.sd != FREE_SLOT) /* If accept polling in needed */
{
ret = cc3000_do_accept(priv->accepting_socket.acc.sd, /* Send the select command on non blocking */
&priv->accepting_socket.addr, /* Set up in ioctl */
&priv->accepting_socket.addrlen);
if (ret != CC3000_SOC_IN_PROGRESS) /* Not waiting => error or accepted */
{
priv->accepting_socket.acc.sd = FREE_SLOT;
priv->accepting_socket.acc.status = ret;
sem_post(&priv->accepting_socket.acc.semwait); /* Release the waiting thread */
}
}
}
return OK;
}
/****************************************************************************
* Name: cc3000_worker
****************************************************************************/
static void * cc3000_worker(FAR void *arg)
{
FAR struct cc3000_dev_s *priv = (FAR struct cc3000_dev_s *)arg;
FAR struct cc3000_config_s *config;
int ret;
ASSERT(priv != NULL);
/* Get a pointer the callbacks for convenience (and so the code is not so
* ugly).
*/
config = priv->config;
DEBUGASSERT(config != NULL);
/* We have started release our creator*/
sem_post(&priv->readysem);
while(1)
{
PROBE(0,1);
CHECK_GUARD(priv);
cc3000_devtake(priv);
/* Done ? */
if ((cc3000_wait_irq(priv) != -EINTR) && (priv->workertid != -1))
{
PROBE(0,0);
nllvdbg("State%d\n",priv->state);
switch (priv->state)
{
case eSPI_STATE_POWERUP:
/* Signal the device has interrupted after power up */
priv->state = eSPI_STATE_INITIALIZED;
sem_post(&priv->readysem);
break;
case eSPI_STATE_WRITE_WAIT_IRQ:
/* Signal the device has interrupted after Chip Select During a write operation */
priv->state = eSPI_STATE_WRITE_PROCEED;
sem_post(&priv->readysem);
break;
case eSPI_STATE_WRITE_DONE: /* IRQ post a write => Solicited */
case eSPI_STATE_IDLE: /* IRQ when Idel => cc3000 has data for the hosts Unsolicited */
{
uint16_t data_to_recv;
priv->state = eSPI_STATE_READ_IRQ;
/* Issue the read command */
cc3000_lock_and_select(priv->spi); /* Assert CS */
priv->state = eSPI_STATE_READ_PROCEED;
SPI_EXCHANGE(priv->spi,spi_readCommand,priv->rx_buffer, ARRAY_SIZE(spi_readCommand));
/* Extract Length bytes from Rx Buffer */
uint16_t *pnetlen = (uint16_t *) &priv->rx_buffer[READ_OFFSET_TO_LENGTH];
data_to_recv = ntohs(*pnetlen);
if (data_to_recv)
{
/* We will read ARRAY_SIZE(spi_readCommand) + data_to_recv. is it odd? */
if ((data_to_recv + ARRAY_SIZE(spi_readCommand)) & 1)
{
/* Odd so make it even */
data_to_recv++;
}
/* Read the whole payload in at the beginning of the buffer
* Will it fit?
*/
DEBUGASSERT(data_to_recv < ARRAY_SIZE(priv->rx_buffer));
SPI_RECVBLOCK(priv->spi, priv->rx_buffer, data_to_recv);
}
cc3000_deselect_and_unlock(priv->spi); /* De assert CS */
/* Disable more messages as the wl code will resume via CC3000IOC_COMPLETE */
if (data_to_recv)
{
int count;
priv->state = eSPI_STATE_READ_READY;
priv->rx_buffer_len = data_to_recv;
ret = mq_send(priv->queue, priv->rx_buffer, data_to_recv, 1);
DEBUGASSERT(ret>=0);
/* Notify any waiters that new CC3000 data is available */
cc3000_notify(priv);
/* Give up driver */
cc3000_devgive(priv);
nllvdbg("Wait On Completion\n");
sem_wait(priv->wrkwaitsem);
nllvdbg("Completed S:%d irq :%d\n",priv->state,priv->config->irq_read(priv->config));
sem_getvalue(&priv->irqsem, &count);
if (priv->config->irq_read(priv->config) && count==0)
{
sem_post(&priv->irqsem);
}
if (priv->state == eSPI_STATE_READ_READY)
{
priv->state = eSPI_STATE_IDLE;
}
continue;
}
} /* eSPI_STATE_WRITE_DONE or eSPI_STATE_IDLE */
break;
default:
nllvdbg("default: State%d\n",priv->state);
break;
} /* end switch */
} /* end if */
cc3000_devgive(priv);
} /* while(1) */
return OK;
}
/****************************************************************************
* Name: cc3000_interrupt
****************************************************************************/
static int cc3000_interrupt(int irq, FAR void *context)
{
FAR struct cc3000_dev_s *priv;
/* Which CC3000 device caused the interrupt? */
#ifndef CONFIG_CC3000_MULTIPLE
priv = &g_cc3000;
#else
for (priv = g_cc3000list;
priv && priv->configs->irq != irq;
priv = priv->flink);
ASSERT(priv != NULL);
#endif
/* Run the worker thread */
PROBE(1,0);
sem_post(&priv->irqsem);
PROBE(1,1);
/* Clear any pending interrupts and return success */
priv->config->irq_clear(priv->config);
return OK;
}
/****************************************************************************
* Name: cc3000_open
****************************************************************************/
static int cc3000_open(FAR struct file *filep)
{
FAR struct inode *inode;
struct mq_attr attr;
pthread_attr_t tattr;
struct sched_param param;
char queuename[QUEUE_NAMELEN];
FAR struct cc3000_dev_s *priv;
uint8_t tmp;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct cc3000_dev_s *)inode->i_private;
CHECK_GUARD(priv);
nllvdbg("crefs: %d\n", priv->crefs);
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
return -ret;
}
/* Increment the reference count */
tmp = priv->crefs + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
goto errout_with_sem;
}
/* When the reference increments to 1, this is the first open event
* on the driver.. and an opportunity to do any one-time initialization.
*/
if (tmp == 1)
{
/* Ensure the power is off so we get the falling edge of IRQ*/
priv->config->power_enable(priv->config, false);
attr.mq_maxmsg = NUMBER_OF_MSGS;
attr.mq_msgsize = CC3000_RX_BUFFER_SIZE;
attr.mq_flags = 0;
/* Set the flags for the open of the queue.
* Make it a blocking open on the queue, meaning it will block if
* this process tries to send to the queue and the queue is full.
*
* O_CREAT - the queue will get created if it does not already exist.
* O_WRONLY - we are only planning to write to the queue.
*
* Open the queue, and create it if the receiving process hasn't
* already created it.
*/
snprintf(queuename, QUEUE_NAMELEN, QUEUE_FORMAT, priv->minor);
priv->queue = mq_open(queuename,O_WRONLY|O_CREAT, 0666, &attr);
if (priv->queue < 0)
{
priv->crefs--;
ret = -errno;
goto errout_with_sem;
}
pthread_attr_init(&tattr);
tattr.stacksize = CONFIG_CC3000_WORKER_STACKSIZE;
param.sched_priority = CONFIG_CC3000_WORKER_THREAD_PRIORITY;
pthread_attr_setschedparam(&tattr, &param);
ret = pthread_create(&priv->workertid, &tattr, cc3000_worker,
(pthread_addr_t)priv);
if (ret != 0)
{
mq_close(priv->queue);
priv->queue = 0;
ret = -errno;
goto errout_with_sem;
}
pthread_attr_init(&tattr);
tattr.stacksize = CONFIG_CC3000_SELECT_STACKSIZE;
param.sched_priority = CONFIG_CC3000_SELECT_THREAD_PRIORITY;
pthread_attr_setschedparam(&tattr, &param);
ret = pthread_create(&priv->selecttid, &tattr, select_thread_func,
(pthread_addr_t)priv);
if (ret != 0)
{
pthread_t workertid = priv->workertid;
priv->workertid = -1;
pthread_cancel(workertid);
mq_close(priv->queue);
priv->queue = 0;
ret = -errno;
goto errout_with_sem;
}
priv->state = eSPI_STATE_POWERUP;
priv->config->irq_clear(priv->config);
/* Bring the device Online A) on http://processors.wiki.ti.com/index.php/File:CC3000_Master_SPI_Write_Sequence_After_Power_Up.png */
priv->config->irq_enable(priv->config, true);
/* Wait on child thread */
cc3000_wait_ready(priv);
priv->config->power_enable(priv->config, true);
}
/* Save the new open count on success */
priv->crefs = tmp;
errout_with_sem:
cc3000_devgive(priv);
return ret;
}
/****************************************************************************
* Name: cc3000_close
****************************************************************************/
static int cc3000_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct cc3000_dev_s *priv;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct cc3000_dev_s *)inode->i_private;
CHECK_GUARD(priv);
nllvdbg("crefs: %d\n", priv->crefs);
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
return -EINTR;
}
/* Decrement the reference count unless it would decrement a negative
* value. When the count decrements to zero, there are no further
* open references to the driver.
*/
int tmp = priv->crefs;
if (priv->crefs >= 1)
{
priv->crefs--;
}
if (tmp == 1)
{
pthread_t id = priv->selecttid;
priv->selecttid = -1;
pthread_cancel(id);
pthread_join(id, NULL);
priv->config->irq_enable(priv->config, false);
priv->config->irq_clear(priv->config);
priv->config->power_enable(priv->config, false);
id = priv->workertid;
priv->workertid = -1;
pthread_cancel(id);
pthread_join(id, NULL);
mq_close(priv->queue);
priv->queue = 0;
}
cc3000_devgive(priv);
return OK;
}
/****************************************************************************
* Name: cc3000_read
****************************************************************************/
static ssize_t cc3000_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct cc3000_dev_s *priv;
int ret;
ssize_t nread;
nllvdbg("buffer:%p len:%d\n", buffer, len);
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct cc3000_dev_s *)inode->i_private;
CHECK_GUARD(priv);
/* Verify that the caller has provided a buffer large enough to receive
* the maximum data.
*/
if (len < CC3000_RX_BUFFER_SIZE)
{
idbg("Unsupported read size: %d\n", len);
nread = -ENOSYS;
goto errout_without_sem;
}
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
nread = -errno;
goto errout_without_sem;
}
for (nread = priv->rx_buffer_len; nread == 0; nread = priv->rx_buffer_len)
{
if (nread > 0)
{
/* Yes.. break out to return what we have. */
break;
}
/* data is not available now. We would have to wait to get
* receive sample data. If the user has specified the O_NONBLOCK
* option, then just return an error.
*/
nllvdbg("CC3000 data is not available\n");
if (filep->f_oflags & O_NONBLOCK)
{
nread = -EAGAIN;
break;
}
/* Otherwise, wait for something to be written to the
* buffer. Increment the number of waiters so that the notify
* will know that it needs to post the semaphore to wake us up.
*/
sched_lock();
priv->nwaiters++;
cc3000_devgive(priv);
/* We may now be pre-empted! But that should be okay because we
* have already incremented nwaiters. Pre-emptions is disabled
* but will be re-enabled while we are waiting.
*/
nllvdbg("Waiting..\n");
ret = sem_wait(&priv->waitsem);
priv->nwaiters--;
sched_unlock();
/* Did we successfully get the waitsem? */
if (ret >= 0)
{
/* Yes... then retake the mutual exclusion semaphore */
ret = cc3000_devtake(priv);
}
/* Was the semaphore wait successful? Did we successful re-take the
* mutual exclusion semaphore?
*/
if (ret < 0)
{
/* No.. One of the two sem_wait's failed. */
int errval = errno;
/* Were we awakened by a signal? Did we read anything before
* we received the signal?
*/
if (errval != EINTR || nread >= 0)
{
/* Yes.. return the error. */
nread = -errval;
}
/* Break out to return what we have. Note, we can't exactly
* "break" out because whichever error occurred, we do not hold
* the exclusion semaphore.
*/
goto errout_without_sem;
}
}
if (nread > 0)
{
memcpy(buffer,priv->rx_buffer,priv->rx_buffer_len);
priv->rx_buffer_len = 0;
}
cc3000_devgive(priv);
errout_without_sem:
nllvdbg("Returning: %d\n", nread);
#ifndef CONFIG_DISABLE_POLL
if (nread > 0)
{
cc3000_pollnotify(priv, POLLOUT);
}
#endif
return nread;
}
/****************************************************************************
* Name:cc3000_write
*
* Bit of non standard buffer management ahead
* The buffer is memory allocated in the user space with space for the spi
* header
*
****************************************************************************/
static ssize_t cc3000_write(FAR struct file *filep, FAR const char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct cc3000_dev_s *priv;
int ret;
ssize_t nwritten = 0;
/* Set the padding if count(buffer) is even ( as it will be come odd with header) */
size_t tx_len = (len & 1) ? len : len +1;
nllvdbg("buffer:%p len:%d tx_len:%d\n", buffer, len, tx_len );
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct cc3000_dev_s *)inode->i_private;
CHECK_GUARD(priv);
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
idbg("sem_wait: %d\n", errno);
nwritten = -errno;
goto errout_without_sem;
}
/* Figure out the total length of the packet in order to figure out if there is padding or not */
priv->tx_buffer[0] = WRITE;
priv->tx_buffer[1] = HI(tx_len);
priv->tx_buffer[2] = LO(tx_len);
priv->tx_buffer[3] = 0;
priv->tx_buffer[4] = 0;
memcpy(&priv->tx_buffer[SPI_HEADER_SIZE],&buffer[SPI_HEADER_SIZE],tx_len);
tx_len += SPI_HEADER_SIZE;
/* The first write transaction to occur after release of the shutdown has
* slightly different timing than the others. The normal Master SPI
* write sequence is nCS low, followed by IRQ low (CC3000 host),
* indicating that the CC3000 core device is ready to accept data.
* However, after power up the sequence is slightly different, as shown
* in the following Figure:
*
* http://processors.wiki.ti.com/index.php/File:CC3000_Master_SPI_Write_Sequence_After_Power_Up.png
*
* The following is a sequence of operations:
* - The master detects the IRQ line low: in this case the detection of
* IRQ low does not indicate the intention of the CC3000 device to
* communicate with the master but rather CC3000 readiness after power
* up.
* - The master asserts nCS.
* - The master introduces a delay of at least 50 μs before starting
* actual transmission of data.
* - The master transmits the first 4 bytes of the SPI header.
* - The master introduces a delay of at least an additional 50 μs.
* - The master transmits the rest of the packet.
*/
if (priv->state == eSPI_STATE_POWERUP)
{
ret = cc3000_wait_ready(priv);
if (ret < 0)
{
nwritten = ret;
goto errout_without_sem;
}
}
if (priv->state == eSPI_STATE_INITIALIZED)
{
cc3000_lock_and_select(priv->spi); /* Assert CS */
usdelay(55);
SPI_SNDBLOCK(priv->spi, priv->tx_buffer, 4);
usdelay(55);
SPI_SNDBLOCK(priv->spi, priv->tx_buffer+4, tx_len-4);
}
else
{
nllvdbg("Assert CS\n");
priv->state = eSPI_STATE_WRITE_WAIT_IRQ;
cc3000_lock_and_select(priv->spi); /* Assert CS */
nllvdbg("Wait on IRQ Active\n");
ret = cc3000_wait_ready(priv);
nllvdbg("IRQ Signaled\n");
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
cc3000_deselect_and_unlock(priv->spi);
nllvdbg("sem_wait: %d\n", errno);
DEBUGASSERT(errno == EINTR);
nwritten = ret;
goto errout_without_sem;
}
SPI_SNDBLOCK(priv->spi, priv->tx_buffer, tx_len);
}
priv->state = eSPI_STATE_WRITE_DONE;
nllvdbg("Deassert CS S:eSPI_STATE_WRITE_DONE\n");
cc3000_deselect_and_unlock(priv->spi);
nwritten = tx_len;
cc3000_devgive(priv);
errout_without_sem:
nllvdbg("Returning: %d\n", ret);
return nwritten;
}
/****************************************************************************
* Name:cc3000_ioctl
****************************************************************************/
static int cc3000_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode;
FAR struct cc3000_dev_s *priv;
int ret;
nllvdbg("cmd: %d arg: %ld\n", cmd, arg);
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct cc3000_dev_s *)inode->i_private;
CHECK_GUARD(priv);
/* Get exclusive access to the driver data structure */
ret = cc3000_devtake(priv);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
return -errno;
}
/* Process the IOCTL by command */
ret = OK;
switch (cmd)
{
case CC3000IOC_GETQUESEMID:
{
FAR int *pminor = (FAR int *)(arg);
DEBUGASSERT(pminor != NULL);
*pminor = priv->minor;
break;
}
case CC3000IOC_ADDSOCKET:
{
FAR int *pfd = (FAR int *)(arg);
DEBUGASSERT(pfd != NULL);
*pfd = cc3000_add_socket(priv, *pfd);
break;
}
case CC3000IOC_REMOVESOCKET:
{
FAR int *pfd = (FAR int *)(arg);
DEBUGASSERT(pfd != NULL);
*pfd = cc3000_remove_socket(priv, *pfd);
break;
}
case CC3000IOC_SELECTDATA:
{
FAR int *pfd = (FAR int *)(arg);
DEBUGASSERT(pfd != NULL);
*pfd = cc3000_wait_data(priv, *pfd);
break;
}
case CC3000IOC_SELECTACCEPT:
{
FAR cc3000_acceptcfg *pcfg = (FAR cc3000_acceptcfg *)(arg);
DEBUGASSERT(pcfg != NULL);
pcfg->sockfd = cc3000_accept_socket(priv, pcfg->sockfd, pcfg->addr, pcfg->addrlen);
break;
}
default:
ret = -ENOTTY;
break;
}
cc3000_devgive(priv);
return ret;
}
/****************************************************************************
* Name: cc3000_poll
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int cc3000_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup)
{
FAR struct inode *inode;
FAR struct cc3000_dev_s *priv;
int ret = OK;
int i;
nllvdbg("setup: %d\n", (int)setup);
DEBUGASSERT(filep && fds);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct cc3000_dev_s *)inode->i_private;
CHECK_GUARD(priv);
/* Are we setting up the poll? Or tearing it down? */
ret = cc3000_devtake(priv);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
return -errno;
}
if (setup)
{
/* Ignore waits that do not include POLLIN */
if ((fds->events & POLLIN) == 0)
{
ret = -EDEADLK;
goto errout;
}
/* This is a request to set up the poll. Find an available
* slot for the poll structure reference
*/
for (i = 0; i < CONFIG_CC3000_NPOLLWAITERS; i++)
{
/* Find an available slot */
if (!priv->fds[i])
{
/* Bind the poll structure and this slot */
priv->fds[i] = fds;
fds->priv = &priv->fds[i];
break;
}
}
if (i >= CONFIG_CC3000_NPOLLWAITERS)
{
fds->priv = NULL;
ret = -EBUSY;
goto errout;
}
/* Should we immediately notify on any of the requested events? */
if (priv->rx_buffer_len)
{
cc3000_notify(priv);
}
}
else if (fds->priv)
{
/* This is a request to tear down the poll. */
struct pollfd **slot = (struct pollfd **)fds->priv;
DEBUGASSERT(slot != NULL);
/* Remove all memory of the poll setup */
*slot = NULL;
fds->priv = NULL;
}
errout:
cc3000_devgive(priv);
return ret;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: cc3000_register
*
* Description:
* Configure the CC3000 to use the provided SPI device instance. This
* will register the driver as /dev/inputN where N is the minor device
* number
*
* Input Parameters:
* dev - An SPI driver instance
* config - Persistent board configuration data
* minor - The input device minor number
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
int cc3000_register(FAR struct spi_dev_s *spi,
FAR struct cc3000_config_s *config, int minor)
{
FAR struct cc3000_dev_s *priv;
char drvname[DEV_NAMELEN];
char semname[SEM_NAMELEN];
#ifdef CONFIG_CC3000_MT
int s;
#endif
#ifdef CONFIG_CC3000_MULTIPLE
irqstate_t flags;
#endif
int ret;
nllvdbg("spi: %p minor: %d\n", spi, minor);
/* Debug-only sanity checks */
DEBUGASSERT(spi != NULL && config != NULL && minor >= 0 && minor < 100);
/* Create and initialize a CC3000 device driver instance */
#ifndef CONFIG_CC3000_MULTIPLE
priv = &g_cc3000;
#else
priv = (FAR struct cc3000_dev_s *)kmalloc(sizeof(struct cc3000_dev_s));
if (!priv)
{
idbg("kmalloc(%d) failed\n", sizeof(struct cc3000_dev_s));
return -ENOMEM;
}
#endif
/* Initialize the CC3000 device driver instance */
memset(priv, 0, sizeof(struct cc3000_dev_s));
INIT_GUARD(priv);
priv->minor = minor; /* Save the minor number */
priv->spi = spi; /* Save the SPI device handle */
priv->config = config; /* Save the board configuration */
sem_init(&priv->devsem, 0, 1); /* Initialize device structure semaphore */
sem_init(&priv->waitsem, 0, 0); /* Initialize event wait semaphore */
sem_init(&priv->irqsem, 0, 0); /* Initialize IRQ Ready semaphore */
sem_init(&priv->readysem, 0, 0); /* Initialize Device Ready semaphore */
(void)snprintf(semname, SEM_NAMELEN, SEM_FORMAT, minor);
priv->wrkwaitsem = sem_open(semname,O_CREAT,0,0); /* Initialize Worker Wait semaphore */
#ifdef CONFIG_CC3000_MT
pthread_mutex_init(&g_cc3000_mut, NULL);
priv->accepting_socket.acc.sd = FREE_SLOT;
sem_init(&priv->accepting_socket.acc.semwait, 0, 0);
for (s = 0; s < CONFIG_WL_MAX_SOCKETS; s++)
{
priv->sockets[s].sd = FREE_SLOT;
sem_init(&priv->sockets[s].semwait, 0, 0);
}
#endif
/* Make sure that interrupts are disabled */
config->irq_clear(config);
config->irq_enable(config, false);
/* Attach the interrupt handler */
ret = config->irq_attach(config, cc3000_interrupt);
if (ret < 0)
{
idbg("Failed to attach interrupt\n");
goto errout_with_priv;
}
/* Register the device as an input device */
(void)snprintf(drvname, DEV_NAMELEN, DEV_FORMAT, minor);
nllvdbg("Registering %s\n", drvname);
ret = register_driver(drvname, &cc3000_fops, 0666, priv);
if (ret < 0)
{
idbg("register_driver() failed: %d\n", ret);
goto errout_with_priv;
}
/* If multiple CC3000 devices are supported, then we will need to add
* this new instance to a list of device instances so that it can be
* found by the interrupt handler based on the recieved IRQ number.
*/
#ifdef CONFIG_CC3000_MULTIPLE
priv->flink = g_cc3000list;
g_cc3000list = priv;
irqrestore(flags);
#endif
/* And return success (?) */
return OK;
errout_with_priv:
sem_destroy(&priv->devsem);
sem_destroy(&priv->waitsem);
sem_destroy(&priv->irqsem);
sem_destroy(&priv->readysem);
sem_close(priv->wrkwaitsem);
sem_unlink(semname);
#ifdef CONFIG_CC3000_MT
pthread_mutex_destroy(&g_cc3000_mut);
sem_destroy(&priv->accepting_socket.acc.semwait);
for (s = 0; s < CONFIG_WL_MAX_SOCKETS; s++)
{
sem_destroy(&priv->sockets[s].semwait);
}
#endif
#ifdef CONFIG_CC3000_MULTIPLE
kfree(priv);
#endif
return ret;
}
/****************************************************************************
* Name: cc3000_wait_data
*
* Description:
* Adds this socket for monitoring for the data available
*
* Input Parameters:
* priv - The device cc3000_dev_s instance
* sockfd cc3000 socket handle
*
* Returned Value:
* Zero is returned on success. Otherwise, a -1 value is
* returned to indicate socket not found or shut down occured.
*
****************************************************************************/
static int cc3000_wait_data(FAR struct cc3000_dev_s *priv, int sockfd)
{
int s;
for (s = 0; s < CONFIG_WL_MAX_SOCKETS; s++)
{
if (priv->sockets[s].sd == sockfd)
{
sched_lock();
cc3000_devgive(priv);
sem_post(&priv->selectsem); /* Wake select thread if need be */
sem_wait(&priv->sockets[s].semwait); /* Wait caller on select to finish */
sem_wait(&priv->selectsem); /* Sleep select thread */
cc3000_devtake(priv);
sched_unlock();
break;
}
}
return (s >= CONFIG_WL_MAX_SOCKETS || priv->selecttid == -1) ? -1 : OK;
}
/****************************************************************************
* Name: cc3000_accept_socket
*
* Description:
* Adds this socket for monitoring for the accept operation
*
* Input Parameters:
* priv - The device cc3000_dev_s instance
* sockfd - cc3000 socket handle to monitor
*
* Returned Value:
* Zero is returned on success. Otherwise, a negative value is
* returned to indicate an error.
*
****************************************************************************/
static int cc3000_accept_socket(FAR struct cc3000_dev_s *priv, int sd, struct sockaddr *addr,
socklen_t *addrlen)
{
priv->accepting_socket.acc.status = CC3000_SOC_ERROR;
priv->accepting_socket.acc.sd = sd;
sched_lock();
cc3000_devgive(priv);
sem_post(&priv->selectsem); /* Wake select thread if need be */
sem_wait(&priv->accepting_socket.acc.semwait); /* Wait caller on select to finish */
sem_wait(&priv->selectsem); /* Sleep the Thread */
cc3000_devtake(priv);
sched_unlock();
if (priv->accepting_socket.acc.status != CC3000_SOC_ERROR)
{
*addr = priv->accepting_socket.addr;
*addrlen = priv->accepting_socket.addrlen;
cc3000_add_socket(priv, priv->accepting_socket.acc.status);
}
return priv->accepting_socket.acc.status;
}
/****************************************************************************
* Name: cc3000_add_socket
*
* Description:
* Adds a socket to the list for monitoring for long operation
*
* Input Parameters:
* sd cc3000 socket handle
* minor - The input device minor number
*
* Returned Value:
* Zero is returned on success. Otherwise, a -1 value is
* returned to indicate socket not found.
*
****************************************************************************/
static int cc3000_add_socket(FAR struct cc3000_dev_s *priv, int sd)
{
irqstate_t flags;
int s;
if (sd < 0)
{
return sd;
}
flags = irqsave();
for (s = 0; s < CONFIG_WL_MAX_SOCKETS; s++)
{
if (priv->sockets[s].sd == FREE_SLOT)
{
priv->sockets[s].sd = sd;
break;
}
}
irqrestore(flags);
return s >= CONFIG_WL_MAX_SOCKETS ? -1 : OK;
}
/****************************************************************************
* Name: cc3000_remove_socket
*
* Description:
* Removes a socket from the list of monitoring for long operation
*
* Input Parameters:
* sd cc3000 socket handle
* minor - The input device minor number
*
* Returned Value:
* Zero is returned on success. Otherwise, a -1 value is
* returned to indicate socket not found.
*
****************************************************************************/
static int cc3000_remove_socket(FAR struct cc3000_dev_s *priv, int sd)
{
irqstate_t flags;
int s;
if (sd < 0)
{
return sd;
}
flags = irqsave();
if (priv->accepting_socket.acc.sd == sd)
{
priv->accepting_socket.acc.sd = FREE_SLOT;
priv->accepting_socket.addrlen = 0;
}
for (s = 0; s < CONFIG_WL_MAX_SOCKETS; s++)
{
if (priv->sockets[s].sd == sd)
{
priv->sockets[s].sd = FREE_SLOT;
break;
}
}
irqrestore(flags);
return s >= CONFIG_WL_MAX_SOCKETS ? -1 : OK;
}
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