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Diffstat (limited to 'linux/drivers/media/video/v4l2-dev.c')
-rw-r--r--linux/drivers/media/video/v4l2-dev.c89
1 files changed, 44 insertions, 45 deletions
diff --git a/linux/drivers/media/video/v4l2-dev.c b/linux/drivers/media/video/v4l2-dev.c
index 861e3194f..9f04a8e6d 100644
--- a/linux/drivers/media/video/v4l2-dev.c
+++ b/linux/drivers/media/video/v4l2-dev.c
@@ -25,7 +25,6 @@
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/slab.h>
-#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -236,6 +235,23 @@ static long v4l2_unlocked_ioctl(struct file *filp,
return vdev->fops->unlocked_ioctl(filp, cmd, arg);
}
+#ifdef CONFIG_MMU
+#define v4l2_get_unmapped_area NULL
+#else
+static unsigned long v4l2_get_unmapped_area(struct file *filp,
+ unsigned long addr, unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ struct video_device *vdev = video_devdata(filp);
+
+ if (!vdev->fops->get_unmapped_area)
+ return -ENOSYS;
+ if (video_is_unregistered(vdev))
+ return -ENODEV;
+ return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
+}
+#endif
+
static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
{
struct video_device *vdev = video_devdata(filp);
@@ -250,7 +266,7 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
static int v4l2_open(struct inode *inode, struct file *filp)
{
struct video_device *vdev;
- int ret;
+ int ret = 0;
/* Check if the video device is available */
mutex_lock(&videodev_lock);
@@ -264,7 +280,9 @@ static int v4l2_open(struct inode *inode, struct file *filp)
/* and increase the device refcount */
video_get(vdev);
mutex_unlock(&videodev_lock);
- ret = vdev->fops->open(filp);
+ if (vdev->fops->open)
+ ret = vdev->fops->open(filp);
+
/* decrease the refcount in case of an error */
if (ret)
video_put(vdev);
@@ -275,7 +293,10 @@ static int v4l2_open(struct inode *inode, struct file *filp)
static int v4l2_release(struct inode *inode, struct file *filp)
{
struct video_device *vdev = video_devdata(filp);
- int ret = vdev->fops->release(filp);
+ int ret = 0;
+
+ if (vdev->fops->release)
+ vdev->fops->release(filp);
/* decrease the refcount unconditionally since the release()
return value is ignored. */
@@ -288,6 +309,7 @@ static const struct file_operations v4l2_unlocked_fops = {
.read = v4l2_read,
.write = v4l2_write,
.open = v4l2_open,
+ .get_unmapped_area = v4l2_get_unmapped_area,
.mmap = v4l2_mmap,
.unlocked_ioctl = v4l2_unlocked_ioctl,
#ifdef CONFIG_COMPAT
@@ -303,6 +325,7 @@ static const struct file_operations v4l2_fops = {
.read = v4l2_read,
.write = v4l2_write,
.open = v4l2_open,
+ .get_unmapped_area = v4l2_get_unmapped_area,
.mmap = v4l2_mmap,
.ioctl = v4l2_ioctl,
#ifdef CONFIG_COMPAT
@@ -314,32 +337,28 @@ static const struct file_operations v4l2_fops = {
};
/**
- * get_index - assign stream number based on parent device
+ * get_index - assign stream index number based on parent device
* @vdev: video_device to assign index number to, vdev->parent should be assigned
- * @num: -1 if auto assign, requested number otherwise
*
* Note that when this is called the new device has not yet been registered
- * in the video_device array.
+ * in the video_device array, but it was able to obtain a minor number.
*
- * Returns -ENFILE if num is already in use, a free index number if
- * successful.
+ * This means that we can always obtain a free stream index number since
+ * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in
+ * use of the video_device array.
+ *
+ * Returns a free index number.
*/
-static int get_index(struct video_device *vdev, int num)
+static int get_index(struct video_device *vdev)
{
/* This can be static since this function is called with the global
videodev_lock held. */
static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES);
int i;
- if (num >= VIDEO_NUM_DEVICES) {
- printk(KERN_ERR "videodev: %s num is too large\n", __func__);
- return -EINVAL;
- }
-
- /* Some drivers do not set the parent. In that case always return
- num or 0. */
+ /* Some drivers do not set the parent. In that case always return 0. */
if (vdev->parent == NULL)
- return num >= 0 ? num : 0;
+ return 0;
bitmap_zero(used, VIDEO_NUM_DEVICES);
@@ -350,30 +369,15 @@ static int get_index(struct video_device *vdev, int num)
}
}
- if (num >= 0) {
- if (test_bit(num, used))
- return -ENFILE;
- return num;
- }
-
- i = find_first_zero_bit(used, VIDEO_NUM_DEVICES);
- return i == VIDEO_NUM_DEVICES ? -ENFILE : i;
-}
-
-int video_register_device(struct video_device *vdev, int type, int nr)
-{
- return video_register_device_index(vdev, type, nr, -1);
+ return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
}
-EXPORT_SYMBOL(video_register_device);
/**
- * video_register_device_index - register video4linux devices
+ * video_register_device - register video4linux devices
* @vdev: video device structure we want to register
* @type: type of device to register
* @nr: which device number (0 == /dev/video0, 1 == /dev/video1, ...
* -1 == first free)
- * @index: stream number based on parent device;
- * -1 if auto assign, requested number otherwise
*
* The registration code assigns minor numbers based on the type
* requested. -ENFILE is returned in all the device slots for this
@@ -392,8 +396,7 @@ EXPORT_SYMBOL(video_register_device);
*
* %VFL_TYPE_RADIO - A radio card
*/
-int video_register_device_index(struct video_device *vdev, int type, int nr,
- int index)
+int video_register_device(struct video_device *vdev, int type, int nr)
{
int i = 0;
int ret;
@@ -433,7 +436,7 @@ int video_register_device_index(struct video_device *vdev, int type, int nr,
vdev->vfl_type = type;
vdev->cdev = NULL;
- if (vdev->v4l2_dev)
+ if (vdev->v4l2_dev && vdev->v4l2_dev->dev)
vdev->parent = vdev->v4l2_dev->dev;
/* Part 2: find a free minor, kernel number and device index. */
@@ -496,14 +499,9 @@ int video_register_device_index(struct video_device *vdev, int type, int nr,
set_bit(nr, video_nums[type]);
/* Should not happen since we thought this minor was free */
WARN_ON(video_device[vdev->minor] != NULL);
- ret = vdev->index = get_index(vdev, index);
+ vdev->index = get_index(vdev);
mutex_unlock(&videodev_lock);
- if (ret < 0) {
- printk(KERN_ERR "%s: get_index failed\n", __func__);
- goto cleanup;
- }
-
/* Part 3: Initialize the character device */
vdev->cdev = cdev_alloc();
if (vdev->cdev == NULL) {
@@ -588,7 +586,7 @@ cleanup:
vdev->minor = -1;
return ret;
}
-EXPORT_SYMBOL(video_register_device_index);
+EXPORT_SYMBOL(video_register_device);
/**
* video_unregister_device - unregister a video4linux device
@@ -654,6 +652,7 @@ module_exit(videodev_exit)
MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2");
MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR);
/*
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-05 04:27:33 +0000