Hi,
This patch moves the video4linux subsystem from procfs to sysfs.
Changes:
* procfs support is completely gone, i.e. /proc/video doesn't
exist any more.
* there is a new device class instead: /sys/class/video4linux.
All video4linux devices which used to be listed in
/proc/video/dev are moved to that place.
Changes required/recommended in video4linux drivers:
* some usb webcam drivers (usbvideo.ko, stv680.ko, se401.ko
and ov511.ko) use the video_proc_entry() to add additional
procfs files. These drivers must be converted to sysfs too
because video_proc_entry() doesn't exist any more.
* struct video_device has a new "dev" field pointing to a struct
device. Drivers should fill that one if possible. It isn't
required through. It will give you fancy device + driver symlinks
in /sys/class/video4linux/<name>.
The patch below includes the changes for bttv.
Comments?
Gerd
--- linux-2.6.0-test1/drivers/media/video/videodev.c.sysfs 2003-07-15 13:30:26.000000000 +0200
+++ linux-2.6.0-test1/drivers/media/video/videodev.c 2003-07-15 14:52:52.000000000 +0200
@@ -15,7 +15,6 @@
* - Added procfs support
*/
-#include <linux/config.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -35,33 +34,31 @@
#include <linux/videodev.h>
-#define VIDEO_NUM_DEVICES 256
+#define VIDEO_NUM_DEVICES 256
+#define VIDEO_NAME "video4linux"
/*
- * Active devices
+ * sysfs stuff
*/
-
-static struct video_device *video_device[VIDEO_NUM_DEVICES];
-static DECLARE_MUTEX(videodev_lock);
+static size_t show_name(struct class_device *cd, char *buf)
+{
+ struct video_device *vfd = cd->class_data;
+ return sprintf(buf,"%.*s\n",sizeof(vfd->name),vfd->name);
+}
-#ifdef CONFIG_VIDEO_PROC_FS
-
-#include <linux/proc_fs.h>
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
-struct videodev_proc_data {
- struct list_head proc_list;
- char name[16];
- struct video_device *vdev;
- struct proc_dir_entry *proc_entry;
+static struct class video_class = {
+ .name = VIDEO_NAME,
};
-static struct proc_dir_entry *video_dev_proc_entry = NULL;
-struct proc_dir_entry *video_proc_entry = NULL;
-EXPORT_SYMBOL(video_proc_entry);
-LIST_HEAD(videodev_proc_list);
-
-#endif /* CONFIG_VIDEO_PROC_FS */
+/*
+ * Active devices
+ */
+
+static struct video_device *video_device[VIDEO_NUM_DEVICES];
+static DECLARE_MUTEX(videodev_lock);
struct video_device* video_devdata(struct file *file)
{
@@ -219,156 +216,6 @@
return 0;
}
-/*
- * /proc support
- */
-
-#ifdef CONFIG_VIDEO_PROC_FS
-
-/* Hmm... i'd like to see video_capability information here, but
- * how can I access it (without changing the other drivers? -claudio
- */
-static int videodev_proc_read(char *page, char **start, off_t off,
- int count, int *eof, void *data)
-{
- char *out = page;
- struct video_device *vfd = data;
- struct videodev_proc_data *d;
- struct list_head *tmp;
- int len;
- char c = ' ';
-
- list_for_each (tmp, &videodev_proc_list) {
- d = list_entry(tmp, struct videodev_proc_data, proc_list);
- if (vfd == d->vdev)
- break;
- }
-
- /* Sanity check */
- if (tmp == &videodev_proc_list)
- goto skip;
-
-#define PRINT_VID_TYPE(x) do { if (vfd->type & x) \
- out += sprintf (out, "%c%s", c, #x); c='|';} while (0)
-
- out += sprintf (out, "name : %s\n", vfd->name);
- out += sprintf (out, "type :");
- PRINT_VID_TYPE(VID_TYPE_CAPTURE);
- PRINT_VID_TYPE(VID_TYPE_TUNER);
- PRINT_VID_TYPE(VID_TYPE_TELETEXT);
- PRINT_VID_TYPE(VID_TYPE_OVERLAY);
- PRINT_VID_TYPE(VID_TYPE_CHROMAKEY);
- PRINT_VID_TYPE(VID_TYPE_CLIPPING);
- PRINT_VID_TYPE(VID_TYPE_FRAMERAM);
- PRINT_VID_TYPE(VID_TYPE_SCALES);
- PRINT_VID_TYPE(VID_TYPE_MONOCHROME);
- PRINT_VID_TYPE(VID_TYPE_SUBCAPTURE);
- PRINT_VID_TYPE(VID_TYPE_MPEG_DECODER);
- PRINT_VID_TYPE(VID_TYPE_MPEG_ENCODER);
- PRINT_VID_TYPE(VID_TYPE_MJPEG_DECODER);
- PRINT_VID_TYPE(VID_TYPE_MJPEG_ENCODER);
- out += sprintf (out, "\n");
- out += sprintf (out, "hardware : 0x%x\n", vfd->hardware);
-#if 0
- out += sprintf (out, "channels : %d\n", d->vcap.channels);
- out += sprintf (out, "audios : %d\n", d->vcap.audios);
- out += sprintf (out, "maxwidth : %d\n", d->vcap.maxwidth);
- out += sprintf (out, "maxheight : %d\n", d->vcap.maxheight);
- out += sprintf (out, "minwidth : %d\n", d->vcap.minwidth);
- out += sprintf (out, "minheight : %d\n", d->vcap.minheight);
-#endif
-
-skip:
- len = out - page;
- len -= off;
- if (len < count) {
- *eof = 1;
- if (len <= 0)
- return 0;
- } else
- len = count;
-
- *start = page + off;
-
- return len;
-}
-
-static void videodev_proc_create(void)
-{
- video_proc_entry = create_proc_entry("video", S_IFDIR, &proc_root);
-
- if (video_proc_entry == NULL) {
- printk("video_dev: unable to initialise /proc/video\n");
- return;
- }
-
- video_proc_entry->owner = THIS_MODULE;
- video_dev_proc_entry = create_proc_entry("dev", S_IFDIR, video_proc_entry);
-
- if (video_dev_proc_entry == NULL) {
- printk("video_dev: unable to initialise /proc/video/dev\n");
- return;
- }
-
- video_dev_proc_entry->owner = THIS_MODULE;
-}
-
-static void __exit videodev_proc_destroy(void)
-{
- if (video_dev_proc_entry != NULL)
- remove_proc_entry("dev", video_proc_entry);
-
- if (video_proc_entry != NULL)
- remove_proc_entry("video", &proc_root);
-}
-
-static void videodev_proc_create_dev (struct video_device *vfd, char *name)
-{
- struct videodev_proc_data *d;
- struct proc_dir_entry *p;
-
- if (video_dev_proc_entry == NULL)
- return;
-
- d = kmalloc (sizeof (struct videodev_proc_data), GFP_KERNEL);
- if (!d)
- return;
-
- p = create_proc_entry(name, S_IFREG|S_IRUGO|S_IWUSR, video_dev_proc_entry);
- if (!p) {
- kfree(d);
- return;
- }
- p->data = vfd;
- p->read_proc = videodev_proc_read;
-
- d->proc_entry = p;
- d->vdev = vfd;
- strcpy (d->name, name);
-
- /* How can I get capability information ? */
-
- list_add (&d->proc_list, &videodev_proc_list);
-}
-
-static void videodev_proc_destroy_dev (struct video_device *vfd)
-{
- struct list_head *tmp;
- struct videodev_proc_data *d;
-
- list_for_each (tmp, &videodev_proc_list) {
- d = list_entry(tmp, struct videodev_proc_data, proc_list);
- if (vfd == d->vdev) {
- remove_proc_entry(d->name, video_dev_proc_entry);
- list_del (&d->proc_list);
- kfree(d);
- break;
- }
- }
-}
-
-#endif /* CONFIG_VIDEO_PROC_FS */
-
extern struct file_operations video_fops;
/**
@@ -456,15 +303,17 @@
devfs_mk_cdev(MKDEV(VIDEO_MAJOR, vfd->minor),
S_IFCHR | S_IRUSR | S_IWUSR, vfd->devfs_name);
init_MUTEX(&vfd->lock);
-
-#ifdef CONFIG_VIDEO_PROC_FS
-{
- char name[16];
- sprintf(name, "%s%d", name_base, i - base);
- videodev_proc_create_dev(vfd, name);
-}
-#endif
+ /* sysfs class */
+ 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.class_data = vfd;
+ 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);
return 0;
}
@@ -482,10 +331,7 @@
if(video_device[vfd->minor]!=vfd)
panic("videodev: bad unregister");
-#ifdef CONFIG_VIDEO_PROC_FS
- videodev_proc_destroy_dev (vfd);
-#endif
-
+ class_device_unregister(&vfd->class_dev);
devfs_remove(vfd->devfs_name);
video_device[vfd->minor]=NULL;
up(&videodev_lock);
@@ -506,24 +352,18 @@
static int __init videodev_init(void)
{
printk(KERN_INFO "Linux video capture interface: v1.00\n");
- if (register_chrdev(VIDEO_MAJOR,"video_capture", &video_fops)) {
+ if (register_chrdev(VIDEO_MAJOR,VIDEO_NAME, &video_fops)) {
printk("video_dev: unable to get major %d\n", VIDEO_MAJOR);
return -EIO;
}
-
-#ifdef CONFIG_VIDEO_PROC_FS
- videodev_proc_create ();
-#endif
-
+ class_register(&video_class);
return 0;
}
static void __exit videodev_exit(void)
{
-#ifdef CONFIG_VIDEO_PROC_FS
- videodev_proc_destroy ();
-#endif
- unregister_chrdev(VIDEO_MAJOR, "video_capture");
+ class_unregister(&video_class);
+ unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
}
module_init(videodev_init)
--- linux-2.6.0-test1/drivers/media/video/bttv-driver.c.sysfs 2003-07-14 12:37:01.000000000 +0200
+++ linux-2.6.0-test1/drivers/media/video/bttv-driver.c 2003-07-15 14:29:02.000000000 +0200
@@ -3413,11 +3413,14 @@
memcpy(&btv->radio_dev, &radio_template, sizeof(radio_template));
memcpy(&btv->vbi_dev, &bttv_vbi_template, sizeof(bttv_vbi_template));
btv->video_dev.minor = -1;
- btv->video_dev.priv = btv;
+ btv->video_dev.priv = btv;
+ btv->video_dev.dev = &dev->dev;
btv->radio_dev.minor = -1;
- btv->radio_dev.priv = btv;
+ btv->radio_dev.priv = btv;
+ btv->radio_dev.dev = &dev->dev;
btv->vbi_dev.minor = -1;
- btv->vbi_dev.priv = btv;
+ btv->vbi_dev.priv = btv;
+ btv->vbi_dev.dev = &dev->dev;
btv->has_radio=radio[btv->nr];
/* pci stuff (init, get irq/mmip, ... */
--- linux-2.6.0-test1/include/linux/videodev.h.sysfs 2003-07-14 12:05:25.000000000 +0200
+++ linux-2.6.0-test1/include/linux/videodev.h 2003-07-15 13:40:50.000000000 +0200
@@ -3,6 +3,7 @@
#include <linux/types.h>
#include <linux/version.h>
+#include <linux/device.h>
#if 1
/*
@@ -24,6 +25,7 @@
struct video_device
{
struct module *owner;
+ struct device *dev;
char name[32];
int type; /* v4l1 */
int type2; /* v4l2 */
@@ -39,6 +41,7 @@
int users;
struct semaphore lock;
char devfs_name[64]; /* devfs */
+ struct class_device class_dev;
};
#define VIDEO_MAJOR 81
