diff options
Diffstat (limited to 'drivers/media/video/pms.c')
| -rw-r--r-- | drivers/media/video/pms.c | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/drivers/media/video/pms.c b/drivers/media/video/pms.c index 00425d74365..994807818aa 100644 --- a/drivers/media/video/pms.c +++ b/drivers/media/video/pms.c @@ -47,6 +47,7 @@ struct pms_device struct video_picture picture; int height; int width; + unsigned long in_use; struct mutex lock; }; @@ -881,10 +882,27 @@ static ssize_t pms_read(struct file *file, char __user *buf, return len; } +static int pms_exclusive_open(struct inode *inode, struct file *file) +{ + struct video_device *v = video_devdata(file); + struct pms_device *pd = (struct pms_device *)v; + + return test_and_set_bit(0, &pd->in_use) ? -EBUSY : 0; +} + +static int pms_exclusive_release(struct inode *inode, struct file *file) +{ + struct video_device *v = video_devdata(file); + struct pms_device *pd = (struct pms_device *)v; + + clear_bit(0, &pd->in_use); + return 0; +} + static const struct file_operations pms_fops = { .owner = THIS_MODULE, - .open = video_exclusive_open, - .release = video_exclusive_release, + .open = pms_exclusive_open, + .release = pms_exclusive_release, .ioctl = pms_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = v4l_compat_ioctl32, @@ -897,6 +915,7 @@ static struct video_device pms_template= { .name = "Mediavision PMS", .fops = &pms_fops, + .release = video_device_release_empty, }; static struct pms_device pms_device; @@ -1019,10 +1038,23 @@ static int init_mediavision(void) * Initialization and module stuff */ +#ifndef MODULE +static int enable; +module_param(enable, int, 0); +#endif + static int __init init_pms_cards(void) { printk(KERN_INFO "Mediavision Pro Movie Studio driver 0.02\n"); +#ifndef MODULE + if (!enable) { + printk(KERN_INFO "PMS: not enabled, use pms.enable=1 to " + "probe\n"); + return -ENODEV; + } +#endif + data_port = io_port +1; if(init_mediavision()) |