struct az_device
{
+ unsigned long in_use;
int curvol;
unsigned long curfreq;
int stereo;
static struct az_device aztech_unit;
+static int aztech_exclusive_open(struct inode *inode, struct file *file)
+{
+ return test_and_set_bit(0, &aztech_unit.in_use) ? -EBUSY : 0;
+}
+
+static int aztech_exclusive_release(struct inode *inode, struct file *file)
+{
+ clear_bit(0, &aztech_unit.in_use);
+ return 0;
+}
+
static const struct file_operations aztech_fops = {
.owner = THIS_MODULE,
- .open = video_exclusive_open,
- .release = video_exclusive_release,
+ .open = aztech_exclusive_open,
+ .release = aztech_exclusive_release,
.ioctl = video_ioctl2,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l_compat_ioctl32,