diff options
Diffstat (limited to 'linux/drivers/media/video/w9966.c')
| -rw-r--r-- | linux/drivers/media/video/w9966.c | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/linux/drivers/media/video/w9966.c b/linux/drivers/media/video/w9966.c index 6aefc6566..f3f28c232 100644 --- a/linux/drivers/media/video/w9966.c +++ b/linux/drivers/media/video/w9966.c @@ -114,6 +114,7 @@ struct w9966_dev { signed char contrast; signed char color; signed char hue; + unsigned long in_use; }; /* @@ -185,10 +186,25 @@ static int w9966_v4l_ioctl(struct inode *inode, struct file *file, static ssize_t w9966_v4l_read(struct file *file, char __user *buf, size_t count, loff_t *ppos); +static int w9966_exclusive_open(struct inode *inode, struct file *file) +{ + struct w9966_dev *cam = video_drvdata(file); + + return test_and_set_bit(0, &cam->in_use) ? -EBUSY : 0; +} + +static int w9966_exclusive_release(struct inode *inode, struct file *file) +{ + struct w9966_dev *cam = video_drvdata(file); + + clear_bit(0, &cam->in_use); + return 0; +} + static const struct file_operations w9966_fops = { .owner = THIS_MODULE, - .open = video_exclusive_open, - .release = video_exclusive_release, + .open = w9966_exclusive_open, + .release = w9966_exclusive_release, .ioctl = w9966_v4l_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = v4l_compat_ioctl32, @@ -199,6 +215,7 @@ static const struct file_operations w9966_fops = { static struct video_device w9966_template = { .name = W9966_DRIVERNAME, .fops = &w9966_fops, + .release = video_device_release_empty, }; /* @@ -333,9 +350,9 @@ static int w9966_init(struct w9966_dev* cam, struct parport* port) // Fill in the video_device struct and register us to v4l memcpy(&cam->vdev, &w9966_template, sizeof(struct video_device)); - cam->vdev.priv = cam; + video_set_drvdata(&cam->vdev, cam); - if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) == -1) + if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) return -1; w9966_setState(cam, W9966_STATE_VDEV, W9966_STATE_VDEV); @@ -714,8 +731,7 @@ static int w9966_wReg_i2c(struct w9966_dev* cam, int reg, int data) static int w9966_v4l_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg) { - struct video_device *vdev = video_devdata(file); - struct w9966_dev *cam = vdev->priv; + struct w9966_dev *cam = video_drvdata(file); switch(cmd) { @@ -873,8 +889,7 @@ static int w9966_v4l_ioctl(struct inode *inode, struct file *file, static ssize_t w9966_v4l_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - struct video_device *vdev = video_devdata(file); - struct w9966_dev *cam = vdev->priv; + struct w9966_dev *cam = video_drvdata(file); unsigned char addr = 0xa0; // ECP, read, CCD-transfer, 00000 unsigned char __user *dest = (unsigned char __user *)buf; unsigned long dleft = count; |