patch-2.4.0-test7 linux/drivers/char/videodev.c

• Lines: 582
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.4.0-test6/linux/drivers/char/videodev.c
• Orig date: Thu Jul 27 17:38:00 2000

diff -u --recursive --new-file v2.4.0-test6/linux/drivers/char/videodev.c linux/drivers/char/videodev.c
@@ -1,581 +0,0 @@
-/*
- * Video capture interface for Linux
- *
- *		A generic video device interface for the LINUX operating system
- *		using a set of device structures/vectors for low level operations.
- *
- *		This program is free software; you can redistribute it and/or
- *		modify it under the terms of the GNU General Public License
- *		as published by the Free Software Foundation; either version
- *		2 of the License, or (at your option) any later version.
- *
- * Author:	Alan Cox, <alan@redhat.com>
- *
- * Fixes:	20000516  Claudio Matsuoka <claudio@conectiva.com>
- *		- Added procfs support
- */
-
-#include <linux/config.h>
-#include <linux/version.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/smp_lock.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/videodev.h>
-#include <linux/init.h>
-
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-#include <linux/kmod.h>
-
-
-#define VIDEO_NUM_DEVICES	256 
-
-/*
- *	Active devices 
- */
- 
-static struct video_device *video_device[VIDEO_NUM_DEVICES];
-
-
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_VIDEO_PROC_FS)
-
-#include <linux/proc_fs.h>
-
-struct videodev_proc_data {
-	struct list_head proc_list;
-	char name[16];
-	struct video_device *vdev;
-	struct proc_dir_entry *proc_entry;
-};
-
-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_PROC_FS && CONFIG_VIDEO_PROC_FS */
-
-
-#ifdef CONFIG_VIDEO_BWQCAM
-extern int init_bw_qcams(struct video_init *);
-#endif
-#ifdef CONFIG_VIDEO_CPIA
-extern int cpia_init(struct video_init *);
-#endif
-#ifdef CONFIG_VIDEO_PLANB
-extern int init_planbs(struct video_init *);
-#endif
-#ifdef CONFIG_VIDEO_ZORAN
-extern int init_zoran_cards(struct video_init *);
-#endif
-
-static struct video_init video_init_list[]={
-#ifdef CONFIG_VIDEO_BWQCAM
-	{"bw-qcam", init_bw_qcams},
-#endif	
-#ifdef CONFIG_VIDEO_CPIA
-	{"cpia", cpia_init},
-#endif	
-#ifdef CONFIG_VIDEO_PLANB
-	{"planb", init_planbs},
-#endif
-#ifdef CONFIG_VIDEO_ZORAN
-	{"zoran", init_zoran_cards},
-#endif	
-	{"end", NULL}
-};
-
-/*
- *	Read will do some smarts later on. Buffer pin etc.
- */
- 
-static ssize_t video_read(struct file *file,
-	char *buf, size_t count, loff_t *ppos)
-{
-	struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)];
-	if(vfl->read)
-		return vfl->read(vfl, buf, count, file->f_flags&O_NONBLOCK);
-	else
-		return -EINVAL;
-}
-
-
-/*
- *	Write for now does nothing. No reason it shouldnt do overlay setting
- *	for some boards I guess..
- */
-
-static ssize_t video_write(struct file *file, const char *buf, 
-	size_t count, loff_t *ppos)
-{
-	struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)];
-	if(vfl->write)
-		return vfl->write(vfl, buf, count, file->f_flags&O_NONBLOCK);
-	else
-		return 0;
-}
-
-/*
- *	Poll to see if we're readable, can probably be used for timing on incoming
- *  frames, etc..
- */
-
-static unsigned int video_poll(struct file *file, poll_table * wait)
-{
-	struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)];
-	if(vfl->poll)
-		return vfl->poll(vfl, file, wait);
-	else
-		return 0;
-}
-
-
-/*
- *	Open a video device.
- */
-
-static int video_open(struct inode *inode, struct file *file)
-{
-	unsigned int minor = MINOR(inode->i_rdev);
-	int err;
-	struct video_device *vfl;
-	
-	if(minor>=VIDEO_NUM_DEVICES)
-		return -ENODEV;
-		
-	vfl=video_device[minor];
-	if(vfl==NULL) {
-		char modname[20];
-
-		sprintf (modname, "char-major-%d-%d", VIDEO_MAJOR, minor);
-		request_module(modname);
-		vfl=video_device[minor];
-		if (vfl==NULL)
-			return -ENODEV;
-	}
-	if(vfl->busy)
-		return -EBUSY;
-	vfl->busy=1;		/* In case vfl->open sleeps */
-	
-	if(vfl->open)
-	{
-		err=vfl->open(vfl,0);	/* Tell the device it is open */
-		if(err)
-		{
-			vfl->busy=0;
-			return err;
-		}
-	}
-	return 0;
-}
-
-/*
- *	Last close of a video for Linux device
- */
-	
-static int video_release(struct inode *inode, struct file *file)
-{
-	struct video_device *vfl;
-	lock_kernel();
-	vfl=video_device[MINOR(inode->i_rdev)];
-	if(vfl->close)
-		vfl->close(vfl);
-	vfl->busy=0;
-	unlock_kernel();
-	return 0;
-}
-
-/*
- *	Question: Should we be able to capture and then seek around the
- *	image ?
- */
- 
-static long long video_lseek(struct file * file,
-			  long long offset, int origin)
-{
-	return -ESPIPE;
-}
-
-static int video_ioctl(struct inode *inode, struct file *file,
-	unsigned int cmd, unsigned long arg)
-{
-	struct video_device *vfl=video_device[MINOR(inode->i_rdev)];
-	int err=vfl->ioctl(vfl, cmd, (void *)arg);
-
-	if(err!=-ENOIOCTLCMD)
-		return err;
-	
-	switch(cmd)
-	{
-		default:
-			return -EINVAL;
-	}
-}
-
-/*
- *	We need to do MMAP support
- */
- 
- 
-int video_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	int ret = -EINVAL;
-	struct video_device *vfl=video_device[MINOR(file->f_dentry->d_inode->i_rdev)];
-	if(vfl->mmap) {
-		lock_kernel();
-		ret = vfl->mmap(vfl, (char *)vma->vm_start, 
-				(unsigned long)(vma->vm_end-vma->vm_start));
-		unlock_kernel();
-	}
-	return ret;
-}
-
-/*
- *	/proc support
- */
-
-#if defined(CONFIG_PROC_FS) && defined(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;
-}
-
-#ifdef MODULE
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_VIDEO_PROC_FS)
-static void 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);
-}
-#endif
-#endif
-
-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);
-	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;
-
-/**
- *	video_register_device - register video4linux devices
- *	@vfd: video device structure we want to register
- *	@type: type of device to register
- *	FIXME: needs a semaphore on 2.3.x
- *	
- *	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
- *	driver initialize function is called (if non %NULL).
- *
- *	Zero is returned on success.
- *
- *	Valid types are
- *
- *	%VFL_TYPE_GRABBER - A frame grabber
- *
- *	%VFL_TYPE_VTX - A teletext device
- *
- *	%VFL_TYPE_VBI - Vertical blank data (undecoded)
- *
- *	%VFL_TYPE_RADIO - A radio card	
- */
- 
-int video_register_device(struct video_device *vfd, int type)
-{
-	int i=0;
-	int base;
-	int err;
-	int end;
-	char *name_base;
-	
-	switch(type)
-	{
-		case VFL_TYPE_GRABBER:
-			base=0;
-			end=64;
-			name_base = "video";
-			break;
-		case VFL_TYPE_VTX:
-			base=192;
-			end=224;
-			name_base = "vtx";
-			break;
-		case VFL_TYPE_VBI:
-			base=224;
-			end=240;
-			name_base = "vbi";
-			break;
-		case VFL_TYPE_RADIO:
-			base=64;
-			end=128;
-			name_base = "radio";
-			break;
-		default:
-			return -1;
-	}
-	
-	for(i=base;i<end;i++)
-	{
-		if(video_device[i]==NULL)
-		{
-			char name[16];
-
-			video_device[i]=vfd;
-			vfd->minor=i;
-			/* The init call may sleep so we book the slot out
-			   then call */
-			MOD_INC_USE_COUNT;
-			if(vfd->initialize)
-			{
-				err=vfd->initialize(vfd);
-				if(err<0)
-				{
-					video_device[i]=NULL;
-					MOD_DEC_USE_COUNT;
-					return err;
-				}
-			}
-			sprintf (name, "v4l/%s%d", name_base, i - base);
-			/*
-			 *	Start the device root only. Anything else
-			 *	has serious privacy issues.
-			 */
-			vfd->devfs_handle =
-			    devfs_register (NULL, name, DEVFS_FL_DEFAULT,
-					    VIDEO_MAJOR, vfd->minor,
-					    S_IFCHR | S_IRUSR | S_IWUSR,
-					    &video_fops, NULL);
-
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_VIDEO_PROC_FS)
-			sprintf (name, "%s%d", name_base, i - base);
-			videodev_proc_create_dev (vfd, name);
-#endif
-			
-
-			return 0;
-		}
-	}
-	return -ENFILE;
-}
-
-/**
- *	video_unregister_device - unregister a video4linux device
- *	@vfd: the device to unregister
- *
- *	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)
-{
-	if(video_device[vfd->minor]!=vfd)
-		panic("vfd: bad unregister");
-
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_VIDEO_PROC_FS)
-	videodev_proc_destroy_dev (vfd);
-#endif
-
-	devfs_unregister (vfd->devfs_handle);
-	video_device[vfd->minor]=NULL;
-	MOD_DEC_USE_COUNT;
-}
-
-
-static struct file_operations video_fops=
-{
-	owner:		THIS_MODULE,
-	llseek:		video_lseek,
-	read:		video_read,
-	write:		video_write,
-	ioctl:		video_ioctl,
-	mmap:		video_mmap,
-	open:		video_open,
-	release:	video_release,
-	poll:		video_poll,
-};
-
-/*
- *	Initialise video for linux
- */
- 
-int __init videodev_init(void)
-{
-	struct video_init *vfli = video_init_list;
-	
-	printk(KERN_INFO "Linux video capture interface: v1.00\n");
-	if(devfs_register_chrdev(VIDEO_MAJOR,"video_capture", &video_fops))
-	{
-		printk("video_dev: unable to get major %d\n", VIDEO_MAJOR);
-		return -EIO;
-	}
-
-	/*
-	 *	Init kernel installed video drivers
-	 */
-	 	
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_VIDEO_PROC_FS)
-	videodev_proc_create ();
-#endif
-	
-	while(vfli->init!=NULL)
-	{
-		vfli->init(vfli);
-		vfli++;
-	}
-	return 0;
-}
-
-#ifdef MODULE		
-int init_module(void)
-{
-	return videodev_init();
-}
-
-void cleanup_module(void)
-{
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_VIDEO_PROC_FS)
-	videodev_proc_destroy ();
-#endif
-	
-	devfs_unregister_chrdev(VIDEO_MAJOR, "video_capture");
-}
-
-#endif
-
-EXPORT_SYMBOL(video_register_device);
-EXPORT_SYMBOL(video_unregister_device);
-
-MODULE_AUTHOR("Alan Cox");
-MODULE_DESCRIPTION("Device registrar for Video4Linux drivers");