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V4L/DVB (8787): v4l2-dev: cleanups and add video_drvdata helper function

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Cleanup v4l2-dev.[ch], add/improve comments and add a new helper
function: video_drvdata() that can get the private driver data from
a file struct.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
2008-08-23 07:48:38 -03:00
committed by Mauro Carvalho Chehab
parent 601e9444f2
commit bfa8a273bb
2 changed files with 27 additions and 21 deletions
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13
drivers/media/video/v4l2-dev.c
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@@ -42,6 +42,7 @@ static ssize_t show_index(struct device *cd,
struct device_attribute *attr, char *buf)
{
struct video_device *vfd = container_of(cd, struct video_device, dev);
return sprintf(buf, "%i\n", vfd->index);
}
@@ -49,6 +50,7 @@ static ssize_t show_name(struct device *cd,
struct device_attribute *attr, char *buf)
{
struct video_device *vfd = container_of(cd, struct video_device, dev);
return sprintf(buf, "%.*s\n", (int)sizeof(vfd->name), vfd->name);
}
@@ -60,10 +62,7 @@ static struct device_attribute video_device_attrs[] = {
struct video_device *video_device_alloc(void)
{
struct video_device *vfd;
vfd = kzalloc(sizeof(*vfd), GFP_KERNEL);
return vfd;
return kzalloc(sizeof(struct video_device), GFP_KERNEL);
}
EXPORT_SYMBOL(video_device_alloc);
@@ -263,7 +262,7 @@ int video_register_device_index(struct video_device *vfd, int type, int nr,
/* pick a minor number */
mutex_lock(&videodev_lock);
if (nr >= 0 && nr < end-base) {
if (nr >= 0 && nr < end-base) {
/* use the one the driver asked for */
i = base + nr;
if (NULL != video_device[i]) {
@@ -295,7 +294,7 @@ int video_register_device_index(struct video_device *vfd, int type, int nr,
}
/* sysfs class */
memset(&vfd->dev, 0x00, sizeof(vfd->dev));
memset(&vfd->dev, 0, sizeof(vfd->dev));
vfd->dev.class = &video_class;
vfd->dev.devt = MKDEV(VIDEO_MAJOR, vfd->minor);
if (vfd->parent)
@@ -312,8 +311,8 @@ int video_register_device_index(struct video_device *vfd, int type, int nr,
fail_minor:
mutex_lock(&videodev_lock);
video_device[vfd->minor] = NULL;
vfd->minor = -1;
mutex_unlock(&videodev_lock);
vfd->minor = -1;
return ret;
}
EXPORT_SYMBOL(video_register_device_index);