cdev_platform.cpp

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/**
 * @file cdev_platform.cpp
 *
 * NuttX Character device functions
 */
#include "cdev_platform.hpp"
#include "../CDev.hpp"

#include <px4_platform_common/posix.h>
#include "drivers/drv_device.h"
#include <sys/ioctl.h>

#ifdef CONFIG_DISABLE_POLL
# error This driver is not compatible with CONFIG_DISABLE_POLL
#endif

namespace cdev
{

/*
 * The standard NuttX operation dispatch table can't call C++ member functions
 * directly, so we have to bounce them through this dispatch table.
 */
static int  cdev_open(file_t *filp);
static int  cdev_close(file_t *filp);
static ssize_t  cdev_read(file_t *filp, char *buffer, size_t buflen);
static ssize_t  cdev_write(file_t *filp, const char *buffer, size_t buflen);
static off_t    cdev_seek(file_t *filp, off_t offset, int whence);
static int  cdev_ioctl(file_t *filp, int cmd, unsigned long arg);
static int  cdev_poll(file_t *filp, px4_pollfd_struct_t *fds, bool setup);

/**
 * Character device indirection table.
 *
 * Every cdev we register gets the same function table; we use the private data
 * field in the inode to store the instance pointer.
 *
 * Note that we use the GNU extension syntax here because we don't get designated
 * initialisers in gcc 4.6.
 */
const struct file_operations cdev::CDev::fops = {
open    : cdev_open,
close   : cdev_close,
read    : cdev_read,
write   : cdev_write,
seek    : cdev_seek,
ioctl   : cdev_ioctl,
poll    : cdev_poll,
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
unlink  : nullptr
#endif
};

static int
cdev_open(file_t *filp)
{
    cdev::CDev *cdev = (cdev::CDev *)(filp->f_inode->i_private);

    return cdev->open(filp);
}

static int
cdev_close(file_t *filp)
{
    cdev::CDev *cdev = (cdev::CDev *)(filp->f_inode->i_private);

    return cdev->close(filp);
}

static ssize_t
cdev_read(file_t *filp, char *buffer, size_t buflen)
{
    cdev::CDev *cdev = (cdev::CDev *)(filp->f_inode->i_private);

    return cdev->read(filp, buffer, buflen);
}

static ssize_t
cdev_write(file_t *filp, const char *buffer, size_t buflen)
{
    cdev::CDev *cdev = (cdev::CDev *)(filp->f_inode->i_private);

    return cdev->write(filp, buffer, buflen);
}

static off_t
cdev_seek(file_t *filp, off_t offset, int whence)
{
    cdev::CDev *cdev = (cdev::CDev *)(filp->f_inode->i_private);

    return cdev->seek(filp, offset, whence);
}

static int
cdev_ioctl(file_t *filp, int cmd, unsigned long arg)
{
    cdev::CDev *cdev = (cdev::CDev *)(filp->f_inode->i_private);

    return cdev->ioctl(filp, cmd, arg);
}

static int
cdev_poll(file_t *filp, px4_pollfd_struct_t *fds, bool setup)
{
    cdev::CDev *cdev = (cdev::CDev *)(filp->f_inode->i_private);

    return cdev->poll(filp, fds, setup);
}

} // namespace cdev