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ethercat
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Allow only one open() on XML device.

This commit is contained in:
Florian Pose 2006-09-19 14:08:31 +00:00
parent e594f09d72
commit 08dabebba4
2 changed files with 24 additions and 0 deletions
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21
master/xmldev.c
View File

@ -74,6 +74,7 @@ int ec_xmldev_init(ec_xmldev_t *xmldev, /**< EtherCAT XML device */
dev_t dev_num /**< device number */
)
{
atomic_set(&xmldev->available, 1);
cdev_init(&xmldev->cdev, &fops);
xmldev->cdev.owner = THIS_MODULE;
if (cdev_add(&xmldev->cdev,
@ -97,11 +98,29 @@ void ec_xmldev_clear(ec_xmldev_t *xmldev /**< EtherCAT XML device */)
/*****************************************************************************/
int ec_xmldev_request(ec_xmldev_t *xmldev,
uint32_t vendor_id,
uint32_t product_code
)
{
return 1;
}
/******************************************************************************
* file_operations
*****************************************************************************/
int ecxmldev_open(struct inode *inode, struct file *filp)
{
ec_xmldev_t *xmldev;
xmldev = container_of(inode->i_cdev, ec_xmldev_t, cdev);
if (!atomic_dec_and_test(&xmldev->available)) {
atomic_inc(&xmldev->available);
return -EBUSY;
}
filp->private_data = xmldev;
EC_DBG("File opened.\n");
@ -113,6 +132,8 @@ int ecxmldev_open(struct inode *inode, struct file *filp)
int ecxmldev_release(struct inode *inode, struct file *filp)
{
ec_xmldev_t *xmldev = container_of(inode->i_cdev, ec_xmldev_t, cdev);
atomic_inc(&xmldev->available);
EC_DBG("File closed.\n");
return 0;
}

3
master/xmldev.h
View File

@ -57,6 +57,7 @@ typedef struct
{
ec_master_t *master; /**< master owning the device */
struct cdev cdev; /**< character device */
atomic_t available; /**< allow only one open() */
}
ec_xmldev_t;
@ -65,6 +66,8 @@ ec_xmldev_t;
int ec_xmldev_init(ec_xmldev_t *, ec_master_t *, dev_t);
void ec_xmldev_clear(ec_xmldev_t *);
int ec_xmldev_request(ec_xmldev_t *, uint32_t, uint32_t);
/*****************************************************************************/
#endif