patch-2.4.0-test7 linux/drivers/media/video/videodev.c

• Lines: 582
• Date: Tue Jul 18 22:35:33 2000
• Orig file: v2.4.0-test6/linux/drivers/media/video/videodev.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test6/linux/drivers/media/video/videodev.c linux/drivers/media/video/videodev.c
@@ -0,0 +1,581 @@
+/*
+ * 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");