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Subject[patch] v4l: sysfs'ify videodev
  Hi,

This patch drops procfs code from videodev.c and adds sysfs support
instead. It adds a new class where all v4l devices are listed. It
also provides some new helper functions for v4l drivers.

Gerd

==============================[ cut here ]==============================
diff -u linux-2.6.0-test2/drivers/media/video/videodev.c linux/drivers/media/video/videodev.c
--- linux-2.6.0-test2/drivers/media/video/videodev.c 2003-08-06 11:13:47.000000000 +0200
+++ linux/drivers/media/video/videodev.c 2003-08-06 11:51:26.000000000 +0200
@@ -15,7 +15,6 @@
* - Added procfs support
*/

-#include <linux/config.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -28,6 +27,7 @@
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/slab.h>
+#include <linux/types.h>
#include <linux/devfs_fs_kernel.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -35,33 +35,67 @@

#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 ssize_t show_name(struct class_device *cd, char *buf)
+{
+ struct video_device *vfd = container_of(cd, struct video_device, class_dev);
+ return sprintf(buf,"%.*s\n",(int)sizeof(vfd->name),vfd->name);
+}
+
+static ssize_t show_dev(struct class_device *cd, char *buf)
+{
+ struct video_device *vfd = container_of(cd, struct video_device, class_dev);
+ dev_t dev = MKDEV(VIDEO_MAJOR, vfd->minor);
+ return sprintf(buf,"%04x\n",(int)dev);
+}

-#ifdef CONFIG_VIDEO_PROC_FS
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);

-#include <linux/proc_fs.h>
+struct video_device *video_device_alloc(void)
+{
+ struct video_device *vfd;

-struct videodev_proc_data {
- struct list_head proc_list;
- char name[16];
- struct video_device *vdev;
- struct proc_dir_entry *proc_entry;
-};
+ vfd = kmalloc(sizeof(*vfd),GFP_KERNEL);
+ if (NULL == vfd)
+ return NULL;
+ memset(vfd,0,sizeof(*vfd));
+ return vfd;
+}
+
+void video_device_release(struct video_device *vfd)
+{
+ kfree(vfd);
+}
+
+static void video_release(struct class_device *cd)
+{
+ struct video_device *vfd = container_of(cd, struct video_device, class_dev);

-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);
+#if 1 /* needed until all drivers are fixed */
+ if (!vfd->release)
+ return;
+#endif
+ vfd->release(vfd);
+}

-#endif /* CONFIG_VIDEO_PROC_FS */
+static struct class video_class = {
+ .name = VIDEO_NAME,
+ .release = video_release,
+};
+
+/*
+ * Active devices
+ */
+
+static struct video_device *video_device[VIDEO_NUM_DEVICES];
+static DECLARE_MUTEX(videodev_lock);

struct video_device* video_devdata(struct file *file)
{
@@ -192,156 +226,6 @@
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;

/**
@@ -429,15 +313,25 @@
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;
+ 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_create_file(&vfd->class_dev,
+ &class_device_attr_dev);
+
+#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 "
+ "http://lwn.net/Articles/36850/\n", vfd->name);
+#endif
return 0;
}

@@ -455,10 +349,7 @@
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);
@@ -479,24 +370,18 @@
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)
@@ -508,6 +393,8 @@
EXPORT_SYMBOL(video_usercopy);
EXPORT_SYMBOL(video_exclusive_open);
EXPORT_SYMBOL(video_exclusive_release);
+EXPORT_SYMBOL(video_device_alloc);
+EXPORT_SYMBOL(video_device_release);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("Device registrar for Video4Linux drivers");
diff -u linux-2.6.0-test2/include/linux/videodev.h linux/include/linux/videodev.h
--- linux-2.6.0-test2/include/linux/videodev.h 2003-08-06 11:15:49.000000000 +0200
+++ linux/include/linux/videodev.h 2003-08-06 11:51:26.000000000 +0200
@@ -3,18 +3,10 @@

#include <linux/types.h>
#include <linux/version.h>
+#include <linux/device.h>

-#if 1
-/*
- * v4l2 is still work-in-progress, integration planed for 2.5.x
- * documentation: http://bytesex.org/v4l/
- * patches available from: http://bytesex.org/patches/
- */
-# define HAVE_V4L2 1
-# include <linux/videodev2.h>
-#else
-# undef HAVE_V4L2
-#endif
+#define HAVE_V4L2 1
+#include <linux/videodev2.h>

#ifdef __KERNEL__

@@ -23,35 +15,71 @@

struct video_device
{
- struct module *owner;
- char name[32];
- int type; /* v4l1 */
- int type2; /* v4l2 */
+ /* device info */
+ struct device *dev;
+ char name[32];
+ int type; /* v4l1 */
+ int type2; /* v4l2 */
int hardware;
int minor;

- /* new interface -- we will use file_operations directly
- * like soundcore does. */
- struct file_operations *fops;
- void *priv; /* Used to be 'private' but that upsets C++ */
-
- /* for videodev.c intenal usage -- don't touch */
- int users;
- struct semaphore lock;
- char devfs_name[64]; /* devfs */
+ /* device ops + callbacks */
+ struct file_operations *fops;
+ void (*release)(struct video_device *vfd);
+
+
+#if 1 /* to be removed in 2.7.x */
+ /* obsolete -- fops->owner is used instead */
+ struct module *owner;
+ /* dev->driver_data will be used instead some day.
+ * Use the video_{get|set}_drvdata() helper functions,
+ * so the switch over will be transparent for you.
+ * Or use {pci|usb}_{get|set}_drvdata() directly. */
+ void *priv;
+#endif
+
+ /* for videodev.c intenal usage -- please don't touch */
+ int users; /* video_exclusive_{open|close} ... */
+ struct semaphore lock; /* ... helper function uses these */
+ char devfs_name[64]; /* devfs */
+ struct class_device class_dev; /* sysfs */
};

#define VIDEO_MAJOR 81
-extern int video_register_device(struct video_device *, int type, int nr);

#define VFL_TYPE_GRABBER 0
#define VFL_TYPE_VBI 1
#define VFL_TYPE_RADIO 2
#define VFL_TYPE_VTX 3

+extern int video_register_device(struct video_device *, int type, int nr);
extern void video_unregister_device(struct video_device *);
extern struct video_device* video_devdata(struct file*);

+#define to_video_device(cd) container_of(cd, struct video_device, class_dev)
+static inline void
+video_device_create_file(struct video_device *vfd,
+ struct class_device_attribute *attr)
+{
+ class_device_create_file(&vfd->class_dev, attr);
+}
+
+/* helper functions to alloc / release struct video_device, the
+ later can be used for video_device->release() */
+struct video_device *video_device_alloc(void);
+void video_device_release(struct video_device *vfd);
+
+/* helper functions to access driver private data. */
+static inline void *video_get_drvdata(struct video_device *dev)
+{
+ return dev->priv;
+}
+
+static inline void video_set_drvdata(struct video_device *dev, void *data)
+{
+ dev->priv = data;
+}
+
extern int video_exclusive_open(struct inode *inode, struct file *file);
extern int video_exclusive_release(struct inode *inode, struct file *file);
extern int video_usercopy(struct inode *inode, struct file *file,
--
sigfault
-
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