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path: root/drivers/media/video/videodev.c
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Diffstat (limited to 'drivers/media/video/videodev.c')
-rw-r--r--drivers/media/video/videodev.c66
1 files changed, 32 insertions, 34 deletions
diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c
index 83c49f9610d0..078880e4c8c0 100644
--- a/drivers/media/video/videodev.c
+++ b/drivers/media/video/videodev.c
@@ -29,7 +29,6 @@
#include <linux/devfs_fs_kernel.h>
#include <asm/uaccess.h>
#include <asm/system.h>
-#include <asm/semaphore.h>
#include <linux/videodev.h>
@@ -52,10 +51,7 @@ struct video_device *video_device_alloc(void)
{
struct video_device *vfd;
- vfd = kmalloc(sizeof(*vfd),GFP_KERNEL);
- if (NULL == vfd)
- return NULL;
- memset(vfd,0,sizeof(*vfd));
+ vfd = kzalloc(sizeof(*vfd),GFP_KERNEL);
return vfd;
}
@@ -68,7 +64,8 @@ static void video_release(struct class_device *cd)
{
struct video_device *vfd = container_of(cd, struct video_device, class_dev);
-#if 1 /* needed until all drivers are fixed */
+#if 1
+ /* needed until all drivers are fixed */
if (!vfd->release)
return;
#endif
@@ -76,16 +73,16 @@ static void video_release(struct class_device *cd)
}
static struct class video_class = {
- .name = VIDEO_NAME,
+ .name = VIDEO_NAME,
.release = video_release,
};
/*
- * Active devices
+ * Active devices
*/
-
+
static struct video_device *video_device[VIDEO_NUM_DEVICES];
-static DECLARE_MUTEX(videodev_lock);
+static DEFINE_MUTEX(videodev_lock);
struct video_device* video_devdata(struct file *file)
{
@@ -101,18 +98,18 @@ static int video_open(struct inode *inode, struct file *file)
int err = 0;
struct video_device *vfl;
struct file_operations *old_fops;
-
+
if(minor>=VIDEO_NUM_DEVICES)
return -ENODEV;
- down(&videodev_lock);
+ mutex_lock(&videodev_lock);
vfl=video_device[minor];
if(vfl==NULL) {
- up(&videodev_lock);
+ mutex_unlock(&videodev_lock);
request_module("char-major-%d-%d", VIDEO_MAJOR, minor);
- down(&videodev_lock);
+ mutex_lock(&videodev_lock);
vfl=video_device[minor];
if (vfl==NULL) {
- up(&videodev_lock);
+ mutex_unlock(&videodev_lock);
return -ENODEV;
}
}
@@ -125,7 +122,7 @@ static int video_open(struct inode *inode, struct file *file)
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
- up(&videodev_lock);
+ mutex_unlock(&videodev_lock);
return err;
}
@@ -189,7 +186,7 @@ video_usercopy(struct inode *inode, struct file *file,
return -ENOMEM;
parg = mbuf;
}
-
+
err = -EFAULT;
if (_IOC_DIR(cmd) & _IOC_WRITE)
if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
@@ -240,7 +237,7 @@ int video_exclusive_open(struct inode *inode, struct file *file)
int video_exclusive_release(struct inode *inode, struct file *file)
{
struct video_device *vfl = video_devdata(file);
-
+
vfl->users--;
return 0;
}
@@ -253,7 +250,7 @@ static struct file_operations video_fops;
* @type: type of device to register
* @nr: which device number (0 == /dev/video0, 1 == /dev/video1, ...
* -1 == first free)
- *
+ *
* The registration code assigns minor numbers based on the type
* requested. -ENFILE is returned in all the device slots for this
* category are full. If not then the minor field is set and the
@@ -269,7 +266,7 @@ static struct file_operations video_fops;
*
* %VFL_TYPE_VBI - Vertical blank data (undecoded)
*
- * %VFL_TYPE_RADIO - A radio card
+ * %VFL_TYPE_RADIO - A radio card
*/
int video_register_device(struct video_device *vfd, int type, int nr)
@@ -278,7 +275,7 @@ int video_register_device(struct video_device *vfd, int type, int nr)
int base;
int end;
char *name_base;
-
+
switch(type)
{
case VFL_TYPE_GRABBER:
@@ -293,7 +290,7 @@ int video_register_device(struct video_device *vfd, int type, int nr)
break;
case VFL_TYPE_VBI:
base=224;
- end=240;
+ end=256;
name_base = "vbi";
break;
case VFL_TYPE_RADIO:
@@ -306,12 +303,12 @@ int video_register_device(struct video_device *vfd, int type, int nr)
}
/* pick a minor number */
- down(&videodev_lock);
+ mutex_lock(&videodev_lock);
if (nr >= 0 && nr < end-base) {
/* use the one the driver asked for */
i = base+nr;
if (NULL != video_device[i]) {
- up(&videodev_lock);
+ mutex_unlock(&videodev_lock);
return -ENFILE;
}
} else {
@@ -320,13 +317,13 @@ int video_register_device(struct video_device *vfd, int type, int nr)
if (NULL == video_device[i])
break;
if (i == end) {
- up(&videodev_lock);
+ mutex_unlock(&videodev_lock);
return -ENFILE;
}
}
video_device[i]=vfd;
vfd->minor=i;
- up(&videodev_lock);
+ mutex_unlock(&videodev_lock);
sprintf(vfd->devfs_name, "v4l/%s%d", name_base, i - base);
devfs_mk_cdev(MKDEV(VIDEO_MAJOR, vfd->minor),
@@ -334,17 +331,18 @@ int video_register_device(struct video_device *vfd, int type, int nr)
init_MUTEX(&vfd->lock);
/* sysfs class */
- memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev));
+ memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev));
if (vfd->dev)
vfd->class_dev.dev = vfd->dev;
vfd->class_dev.class = &video_class;
- vfd->class_dev.devt = MKDEV(VIDEO_MAJOR, vfd->minor);
+ vfd->class_dev.devt = MKDEV(VIDEO_MAJOR, vfd->minor);
strlcpy(vfd->class_dev.class_id, vfd->devfs_name + 4, BUS_ID_SIZE);
class_device_register(&vfd->class_dev);
class_device_create_file(&vfd->class_dev,
- &class_device_attr_name);
+ &class_device_attr_name);
-#if 1 /* needed until all drivers are fixed */
+#if 1
+ /* needed until all drivers are fixed */
if (!vfd->release)
printk(KERN_WARNING "videodev: \"%s\" has no release callback. "
"Please fix your driver for proper sysfs support, see "
@@ -360,17 +358,17 @@ int video_register_device(struct video_device *vfd, int type, int nr)
* This unregisters the passed device and deassigns the minor
* number. Future open calls will be met with errors.
*/
-
+
void video_unregister_device(struct video_device *vfd)
{
- down(&videodev_lock);
+ mutex_lock(&videodev_lock);
if(video_device[vfd->minor]!=vfd)
panic("videodev: bad unregister");
devfs_remove(vfd->devfs_name);
video_device[vfd->minor]=NULL;
class_device_unregister(&vfd->class_dev);
- up(&videodev_lock);
+ mutex_unlock(&videodev_lock);
}
@@ -384,7 +382,7 @@ static struct file_operations video_fops=
/*
* Initialise video for linux
*/
-
+
static int __init videodev_init(void)
{
int ret;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-04 02:40:22 +0300