[linux-2.6-block.git] / drivers / media / dvb / dvb-core / dvbdev.c

/*
 * dvbdev.c
 *
 * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
 *                  & Marcus Metzler <marcus@convergence.de>
 *                    for convergence integrated media GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/mutex.h>
#include "dvbdev.h"

static int dvbdev_debug;

module_param(dvbdev_debug, int, 0644);
MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");

#define dprintk if (dvbdev_debug) printk

static LIST_HEAD(dvb_adapter_list);
static DEFINE_MUTEX(dvbdev_register_lock);

static const char * const dnames[] = {
	"video", "audio", "sec", "frontend", "demux", "dvr", "ca",
	"net", "osd"
};

#define DVB_MAX_ADAPTERS	8
#define DVB_MAX_IDS		4
#define nums2minor(num,type,id)	((num << 6) | (id << 4) | type)
#define MAX_DVB_MINORS		(DVB_MAX_ADAPTERS*64)

static struct class *dvb_class;

static struct dvb_device* dvbdev_find_device (int minor)
{
	struct list_head *entry;

	list_for_each (entry, &dvb_adapter_list) {
		struct list_head *entry0;
		struct dvb_adapter *adap;
		adap = list_entry (entry, struct dvb_adapter, list_head);
		list_for_each (entry0, &adap->device_list) {
			struct dvb_device *dev;
			dev = list_entry (entry0, struct dvb_device, list_head);
			if (nums2minor(adap->num, dev->type, dev->id) == minor)
				return dev;
		}
	}

	return NULL;
}


static int dvb_device_open(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev;

	dvbdev = dvbdev_find_device (iminor(inode));

	if (dvbdev && dvbdev->fops) {
		int err = 0;
		const struct file_operations *old_fops;

		file->private_data = dvbdev;
		old_fops = file->f_op;
		file->f_op = fops_get(dvbdev->fops);
		if(file->f_op->open)
			err = file->f_op->open(inode,file);
		if (err) {
			fops_put(file->f_op);
			file->f_op = fops_get(old_fops);
		}
		fops_put(old_fops);
		return err;
	}
	return -ENODEV;
}


static struct file_operations dvb_device_fops =
{
	.owner =	THIS_MODULE,
	.open =		dvb_device_open,
};

static struct cdev dvb_device_cdev = {
	.kobj   = {.name = "dvb", },
	.owner  =       THIS_MODULE,
};

int dvb_generic_open(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if (!dvbdev->users)
		return -EBUSY;

	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
		if (!dvbdev->readers)
			return -EBUSY;
		dvbdev->readers--;
	} else {
		if (!dvbdev->writers)
			return -EBUSY;
		dvbdev->writers--;
	}

	dvbdev->users--;
	return 0;
}
EXPORT_SYMBOL(dvb_generic_open);


int dvb_generic_release(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
		dvbdev->readers++;
	} else {
		dvbdev->writers++;
	}

	dvbdev->users++;
	return 0;
}
EXPORT_SYMBOL(dvb_generic_release);


int dvb_generic_ioctl(struct inode *inode, struct file *file,
		      unsigned int cmd, unsigned long arg)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if (!dvbdev->kernel_ioctl)
		return -EINVAL;

	return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl);
}
EXPORT_SYMBOL(dvb_generic_ioctl);


static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
{
	u32 id = 0;

	while (id < DVB_MAX_IDS) {
		struct list_head *entry;
		list_for_each (entry, &adap->device_list) {
			struct dvb_device *dev;
			dev = list_entry (entry, struct dvb_device, list_head);
			if (dev->type == type && dev->id == id)
				goto skip;
		}
		return id;
skip:
		id++;
	}
	return -ENFILE;
}


int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
			const struct dvb_device *template, void *priv, int type)
{
	struct dvb_device *dvbdev;
	struct file_operations *dvbdevfops;
	struct device *clsdev;
	int id;

	mutex_lock(&dvbdev_register_lock);

	if ((id = dvbdev_get_free_id (adap, type)) < 0){
		mutex_unlock(&dvbdev_register_lock);
		*pdvbdev = NULL;
		printk(KERN_ERR "%s: couldn't find free device id\n", __FUNCTION__);
		return -ENFILE;
	}

	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);

	if (!dvbdev){
		mutex_unlock(&dvbdev_register_lock);
		return -ENOMEM;
	}

	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);

	if (!dvbdevfops){
		kfree (dvbdev);
		mutex_unlock(&dvbdev_register_lock);
		return -ENOMEM;
	}

	memcpy(dvbdev, template, sizeof(struct dvb_device));
	dvbdev->type = type;
	dvbdev->id = id;
	dvbdev->adapter = adap;
	dvbdev->priv = priv;
	dvbdev->fops = dvbdevfops;
	init_waitqueue_head (&dvbdev->wait_queue);

	memcpy(dvbdev->fops, template->fops, sizeof(struct file_operations));
	dvbdev->fops->owner = adap->module;

	list_add_tail (&dvbdev->list_head, &adap->device_list);

	mutex_unlock(&dvbdev_register_lock);

	clsdev = device_create(dvb_class, adap->device,
			       MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
			       "dvb%d.%s%d", adap->num, dnames[type], id);
	if (IS_ERR(clsdev)) {
		printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
		       __FUNCTION__, adap->num, dnames[type], id, PTR_ERR(clsdev));
		return PTR_ERR(clsdev);
	}

	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
		adap->num, dnames[type], id, nums2minor(adap->num, type, id),
		nums2minor(adap->num, type, id));

	return 0;
}
EXPORT_SYMBOL(dvb_register_device);


void dvb_unregister_device(struct dvb_device *dvbdev)
{
	if (!dvbdev)
		return;

	device_destroy(dvb_class, MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num,
		       dvbdev->type, dvbdev->id)));

	list_del (&dvbdev->list_head);
	kfree (dvbdev->fops);
	kfree (dvbdev);
}
EXPORT_SYMBOL(dvb_unregister_device);


static int dvbdev_get_free_adapter_num (void)
{
	int num = 0;

	while (num < DVB_MAX_ADAPTERS) {
		struct list_head *entry;
		list_for_each (entry, &dvb_adapter_list) {
			struct dvb_adapter *adap;
			adap = list_entry (entry, struct dvb_adapter, list_head);
			if (adap->num == num)
				goto skip;
		}
		return num;
skip:
		num++;
	}

	return -ENFILE;
}


int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct module *module, struct device *device)
{
	int num;

	mutex_lock(&dvbdev_register_lock);

	if ((num = dvbdev_get_free_adapter_num ()) < 0) {
		mutex_unlock(&dvbdev_register_lock);
		return -ENFILE;
	}

	memset (adap, 0, sizeof(struct dvb_adapter));
	INIT_LIST_HEAD (&adap->device_list);

	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);

	adap->num = num;
	adap->name = name;
	adap->module = module;
	adap->device = device;

	list_add_tail (&adap->list_head, &dvb_adapter_list);

	mutex_unlock(&dvbdev_register_lock);

	return num;
}
EXPORT_SYMBOL(dvb_register_adapter);


int dvb_unregister_adapter(struct dvb_adapter *adap)
{
	mutex_lock(&dvbdev_register_lock);
	list_del (&adap->list_head);
	mutex_unlock(&dvbdev_register_lock);
	return 0;
}
EXPORT_SYMBOL(dvb_unregister_adapter);

/* if the miracle happens and "generic_usercopy()" is included into
   the kernel, then this can vanish. please don't make the mistake and
   define this as video_usercopy(). this will introduce a dependecy
   to the v4l "videodev.o" module, which is unnecessary for some
   cards (ie. the budget dvb-cards don't need the v4l module...) */
int dvb_usercopy(struct inode *inode, struct file *file,
		     unsigned int cmd, unsigned long arg,
		     int (*func)(struct inode *inode, struct file *file,
		     unsigned int cmd, void *arg))
{
	char    sbuf[128];
	void    *mbuf = NULL;
	void    *parg = NULL;
	int     err  = -EINVAL;

	/*  Copy arguments into temp kernel buffer  */
	switch (_IOC_DIR(cmd)) {
	case _IOC_NONE:
		/*
		 * For this command, the pointer is actually an integer
		 * argument.
		 */
		parg = (void *) arg;
		break;
	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	case _IOC_WRITE:
	case (_IOC_WRITE | _IOC_READ):
		if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
			parg = sbuf;
		} else {
			/* too big to allocate from stack */
			mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
			if (NULL == mbuf)
				return -ENOMEM;
			parg = mbuf;
		}

		err = -EFAULT;
		if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
			goto out;
		break;
	}

	/* call driver */
	if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD)
		err = -EINVAL;

	if (err < 0)
		goto out;

	/*  Copy results into user buffer  */
	switch (_IOC_DIR(cmd))
	{
	case _IOC_READ:
	case (_IOC_WRITE | _IOC_READ):
		if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
			err = -EFAULT;
		break;
	}

out:
	kfree(mbuf);
	return err;
}

static int __init init_dvbdev(void)
{
	int retval;
	dev_t dev = MKDEV(DVB_MAJOR, 0);

	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
		printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
		return retval;
	}

	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
		printk(KERN_ERR "dvb-core: unable register character device\n");
		goto error;
	}

	dvb_class = class_create(THIS_MODULE, "dvb");
	if (IS_ERR(dvb_class)) {
		retval = PTR_ERR(dvb_class);
		goto error;
	}
	return 0;

error:
	cdev_del(&dvb_device_cdev);
	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	return retval;
}


static void __exit exit_dvbdev(void)
{
	class_destroy(dvb_class);
	cdev_del(&dvb_device_cdev);
	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
}

subsys_initcall(init_dvbdev);
module_exit(exit_dvbdev);

MODULE_DESCRIPTION("DVB Core Driver");
MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* dvbdev.c
	3	*
	4	* Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>
	5	* & Marcus Metzler <marcus@convergence.de>
	6	* for convergence integrated media GmbH
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public License
	10	* as published by the Free Software Foundation; either version 2.1
	11	* of the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	21	*
	22	*/
	23
	24	#include <linux/types.h>
	25	#include <linux/errno.h>
	26	#include <linux/string.h>
	27	#include <linux/module.h>
1da177e4	28	#include <linux/kernel.h>
1da177e4 LT	29	#include <linux/init.h>
	30	#include <linux/slab.h>
	31	#include <linux/device.h>
	32	#include <linux/fs.h>
	33	#include <linux/cdev.h>
1e4baed3	34	#include <linux/mutex.h>
1da177e4 LT	35	#include "dvbdev.h"
	36
	37	static int dvbdev_debug;
	38
	39	module_param(dvbdev_debug, int, 0644);
	40	MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
	41
	42	#define dprintk if (dvbdev_debug) printk
	43
	44	static LIST_HEAD(dvb_adapter_list);
1e4baed3	45	static DEFINE_MUTEX(dvbdev_register_lock);
1da177e4 LT	46
1da177e4 LT	47	static const char * const dnames[] = {
afd1a0c9	48	"video", "audio", "sec", "frontend", "demux", "dvr", "ca",
1da177e4 LT	49	"net", "osd"
	50	};
	51
	52	#define DVB_MAX_ADAPTERS 8
	53	#define DVB_MAX_IDS 4
	54	#define nums2minor(num,type,id) ((num << 6) \| (id << 4) \| type)
	55	#define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
	56
56b22935	57	static struct class *dvb_class;
1da177e4 LT	58
	59	static struct dvb_device* dvbdev_find_device (int minor)
	60	{
	61	struct list_head *entry;
	62
	63	list_for_each (entry, &dvb_adapter_list) {
	64	struct list_head *entry0;
	65	struct dvb_adapter *adap;
	66	adap = list_entry (entry, struct dvb_adapter, list_head);
	67	list_for_each (entry0, &adap->device_list) {
	68	struct dvb_device *dev;
	69	dev = list_entry (entry0, struct dvb_device, list_head);
	70	if (nums2minor(adap->num, dev->type, dev->id) == minor)
	71	return dev;
	72	}
	73	}
	74
	75	return NULL;
	76	}
	77
	78
	79	static int dvb_device_open(struct inode inode, struct file file)
	80	{
	81	struct dvb_device *dvbdev;
	82
	83	dvbdev = dvbdev_find_device (iminor(inode));
	84
	85	if (dvbdev && dvbdev->fops) {
	86	int err = 0;
99ac48f5	87	const struct file_operations *old_fops;
1da177e4 LT	88
	89	file->private_data = dvbdev;
	90	old_fops = file->f_op;
afd1a0c9 MCC	91	file->f_op = fops_get(dvbdev->fops);
afd1a0c9 MCC	92	if(file->f_op->open)
50c25fff	93	err = file->f_op->open(inode,file);
afd1a0c9	94	if (err) {
50c25fff MK	95	fops_put(file->f_op);
50c25fff MK	96	file->f_op = fops_get(old_fops);
afd1a0c9 MCC	97	}
	98	fops_put(old_fops);
	99	return err;
1da177e4 LT	100	}
	101	return -ENODEV;
	102	}
	103
	104
	105	static struct file_operations dvb_device_fops =
	106	{
	107	.owner = THIS_MODULE,
	108	.open = dvb_device_open,
	109	};
	110
	111	static struct cdev dvb_device_cdev = {
	112	.kobj = {.name = "dvb", },
	113	.owner = THIS_MODULE,
	114	};
	115
	116	int dvb_generic_open(struct inode inode, struct file file)
	117	{
afd1a0c9	118	struct dvb_device *dvbdev = file->private_data;
1da177e4	119
afd1a0c9 MCC	120	if (!dvbdev)
afd1a0c9 MCC	121	return -ENODEV;
1da177e4 LT	122
1da177e4 LT	123	if (!dvbdev->users)
afd1a0c9	124	return -EBUSY;
1da177e4 LT	125
1da177e4 LT	126	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
afd1a0c9 MCC	127	if (!dvbdev->readers)
afd1a0c9 MCC	128	return -EBUSY;
1da177e4 LT	129	dvbdev->readers--;
1da177e4 LT	130	} else {
afd1a0c9 MCC	131	if (!dvbdev->writers)
afd1a0c9 MCC	132	return -EBUSY;
1da177e4 LT	133	dvbdev->writers--;
	134	}
	135
	136	dvbdev->users--;
	137	return 0;
	138	}
	139	EXPORT_SYMBOL(dvb_generic_open);
	140
	141
	142	int dvb_generic_release(struct inode inode, struct file file)
	143	{
afd1a0c9	144	struct dvb_device *dvbdev = file->private_data;
1da177e4 LT	145
1da177e4 LT	146	if (!dvbdev)
afd1a0c9	147	return -ENODEV;
1da177e4 LT	148
	149	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
	150	dvbdev->readers++;
	151	} else {
	152	dvbdev->writers++;
	153	}
	154
	155	dvbdev->users++;
	156	return 0;
	157	}
	158	EXPORT_SYMBOL(dvb_generic_release);
	159
	160
	161	int dvb_generic_ioctl(struct inode inode, struct file file,
	162	unsigned int cmd, unsigned long arg)
	163	{
afd1a0c9	164	struct dvb_device *dvbdev = file->private_data;
1da177e4	165
afd1a0c9 MCC	166	if (!dvbdev)
afd1a0c9 MCC	167	return -ENODEV;
1da177e4 LT	168
	169	if (!dvbdev->kernel_ioctl)
	170	return -EINVAL;
	171
	172	return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl);
	173	}
	174	EXPORT_SYMBOL(dvb_generic_ioctl);
	175
	176
	177	static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
	178	{
	179	u32 id = 0;
	180
	181	while (id < DVB_MAX_IDS) {
	182	struct list_head *entry;
	183	list_for_each (entry, &adap->device_list) {
	184	struct dvb_device *dev;
	185	dev = list_entry (entry, struct dvb_device, list_head);
	186	if (dev->type == type && dev->id == id)
	187	goto skip;
	188	}
	189	return id;
	190	skip:
	191	id++;
	192	}
	193	return -ENFILE;
	194	}
	195
	196
	197	int dvb_register_device(struct dvb_adapter adap, struct dvb_device *pdvbdev,
	198	const struct dvb_device template, void priv, int type)
	199	{
	200	struct dvb_device *dvbdev;
b6190102	201	struct file_operations *dvbdevfops;
5f553388	202	struct device *clsdev;
1da177e4 LT	203	int id;
1da177e4 LT	204
c2788502	205	mutex_lock(&dvbdev_register_lock);
1da177e4	206
b6190102	207	if ((id = dvbdev_get_free_id (adap, type)) < 0){
1e4baed3	208	mutex_unlock(&dvbdev_register_lock);
1da177e4	209	*pdvbdev = NULL;
900858ec	210	printk(KERN_ERR "%s: couldn't find free device id\n", __FUNCTION__);
1da177e4 LT	211	return -ENFILE;
	212	}
	213
	214	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
	215
b6190102 MS	216	if (!dvbdev){
	217	mutex_unlock(&dvbdev_register_lock);
	218	return -ENOMEM;
	219	}
	220
	221	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
	222
	223	if (!dvbdevfops){
	224	kfree (dvbdev);
1e4baed3	225	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	226	return -ENOMEM;
	227	}
	228
1da177e4 LT	229	memcpy(dvbdev, template, sizeof(struct dvb_device));
	230	dvbdev->type = type;
	231	dvbdev->id = id;
	232	dvbdev->adapter = adap;
	233	dvbdev->priv = priv;
b6190102	234	dvbdev->fops = dvbdevfops;
ca5be9cd	235	init_waitqueue_head (&dvbdev->wait_queue);
1da177e4	236
b6190102	237	memcpy(dvbdev->fops, template->fops, sizeof(struct file_operations));
1da177e4 LT	238	dvbdev->fops->owner = adap->module;
	239
	240	list_add_tail (&dvbdev->list_head, &adap->device_list);
	241
f47f4763 AQ	242	mutex_unlock(&dvbdev_register_lock);
f47f4763 AQ	243
5f553388 KS	244	clsdev = device_create(dvb_class, adap->device,
	245	MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
	246	"dvb%d.%s%d", adap->num, dnames[type], id);
4abdcf93 SA	247	if (IS_ERR(clsdev)) {
	248	printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
	249	__FUNCTION__, adap->num, dnames[type], id, PTR_ERR(clsdev));
	250	return PTR_ERR(clsdev);
	251	}
1da177e4	252
900858ec	253	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
1da177e4 LT	254	adap->num, dnames[type], id, nums2minor(adap->num, type, id),
	255	nums2minor(adap->num, type, id));
	256
	257	return 0;
	258	}
	259	EXPORT_SYMBOL(dvb_register_device);
	260
	261
	262	void dvb_unregister_device(struct dvb_device *dvbdev)
	263	{
	264	if (!dvbdev)
	265	return;
	266
5f553388 KS	267	device_destroy(dvb_class, MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num,
5f553388 KS	268	dvbdev->type, dvbdev->id)));
1da177e4 LT	269
1da177e4 LT	270	list_del (&dvbdev->list_head);
b6190102	271	kfree (dvbdev->fops);
1da177e4 LT	272	kfree (dvbdev);
	273	}
	274	EXPORT_SYMBOL(dvb_unregister_device);
	275
	276
	277	static int dvbdev_get_free_adapter_num (void)
	278	{
	279	int num = 0;
	280
	281	while (num < DVB_MAX_ADAPTERS) {
	282	struct list_head *entry;
	283	list_for_each (entry, &dvb_adapter_list) {
	284	struct dvb_adapter *adap;
	285	adap = list_entry (entry, struct dvb_adapter, list_head);
	286	if (adap->num == num)
	287	goto skip;
	288	}
	289	return num;
	290	skip:
	291	num++;
	292	}
	293
	294	return -ENFILE;
	295	}
	296
	297
d09dbf92	298	int dvb_register_adapter(struct dvb_adapter adap, const char name, struct module module, struct device device)
1da177e4	299	{
1da177e4 LT	300	int num;
1da177e4 LT	301
c2788502	302	mutex_lock(&dvbdev_register_lock);
1da177e4 LT	303
1da177e4 LT	304	if ((num = dvbdev_get_free_adapter_num ()) < 0) {
1e4baed3	305	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	306	return -ENFILE;
	307	}
	308
1da177e4 LT	309	memset (adap, 0, sizeof(struct dvb_adapter));
	310	INIT_LIST_HEAD (&adap->device_list);
	311
900858ec	312	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
1da177e4	313
1da177e4 LT	314	adap->num = num;
	315	adap->name = name;
	316	adap->module = module;
d09dbf92	317	adap->device = device;
1da177e4 LT	318
	319	list_add_tail (&adap->list_head, &dvb_adapter_list);
	320
1e4baed3	321	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	322
	323	return num;
	324	}
	325	EXPORT_SYMBOL(dvb_register_adapter);
	326
	327
	328	int dvb_unregister_adapter(struct dvb_adapter *adap)
	329	{
c2788502	330	mutex_lock(&dvbdev_register_lock);
1da177e4	331	list_del (&adap->list_head);
1e4baed3	332	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	333	return 0;
	334	}
	335	EXPORT_SYMBOL(dvb_unregister_adapter);
	336
	337	/* if the miracle happens and "generic_usercopy()" is included into
	338	the kernel, then this can vanish. please don't make the mistake and
	339	define this as video_usercopy(). this will introduce a dependecy
	340	to the v4l "videodev.o" module, which is unnecessary for some
	341	cards (ie. the budget dvb-cards don't need the v4l module...) */
	342	int dvb_usercopy(struct inode inode, struct file file,
afd1a0c9	343	unsigned int cmd, unsigned long arg,
1da177e4 LT	344	int (func)(struct inode inode, struct file *file,
	345	unsigned int cmd, void *arg))
	346	{
afd1a0c9 MCC	347	char sbuf[128];
	348	void *mbuf = NULL;
	349	void *parg = NULL;
	350	int err = -EINVAL;
	351
	352	/* Copy arguments into temp kernel buffer */
	353	switch (_IOC_DIR(cmd)) {
	354	case _IOC_NONE:
1da177e4 LT	355	/*
	356	* For this command, the pointer is actually an integer
	357	* argument.
	358	*/
	359	parg = (void *) arg;
	360	break;
afd1a0c9 MCC	361	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	362	case _IOC_WRITE:
	363	case (_IOC_WRITE \| _IOC_READ):
	364	if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
50c25fff	365	parg = sbuf;
afd1a0c9	366	} else {
50c25fff MK	367	/* too big to allocate from stack */
	368	mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
	369	if (NULL == mbuf)
	370	return -ENOMEM;
	371	parg = mbuf;
afd1a0c9 MCC	372	}
	373
	374	err = -EFAULT;
	375	if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
50c25fff	376	goto out;
afd1a0c9 MCC	377	break;
	378	}
	379
	380	/* call driver */
	381	if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD)
	382	err = -EINVAL;
	383
	384	if (err < 0)
	385	goto out;
	386
	387	/* Copy results into user buffer */
	388	switch (_IOC_DIR(cmd))
	389	{
	390	case _IOC_READ:
	391	case (_IOC_WRITE \| _IOC_READ):
	392	if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
50c25fff	393	err = -EFAULT;
afd1a0c9 MCC	394	break;
afd1a0c9 MCC	395	}
1da177e4 LT	396
1da177e4 LT	397	out:
afd1a0c9 MCC	398	kfree(mbuf);
afd1a0c9 MCC	399	return err;
1da177e4 LT	400	}
	401
	402	static int __init init_dvbdev(void)
	403	{
	404	int retval;
	405	dev_t dev = MKDEV(DVB_MAJOR, 0);
	406
	407	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
900858ec	408	printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
1da177e4 LT	409	return retval;
	410	}
	411
	412	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	413	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
900858ec	414	printk(KERN_ERR "dvb-core: unable register character device\n");
1da177e4 LT	415	goto error;
	416	}
	417
56b22935	418	dvb_class = class_create(THIS_MODULE, "dvb");
1da177e4 LT	419	if (IS_ERR(dvb_class)) {
	420	retval = PTR_ERR(dvb_class);
	421	goto error;
	422	}
	423	return 0;
	424
	425	error:
	426	cdev_del(&dvb_device_cdev);
	427	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	428	return retval;
	429	}
	430
	431
	432	static void __exit exit_dvbdev(void)
	433	{
56b22935	434	class_destroy(dvb_class);
1da177e4	435	cdev_del(&dvb_device_cdev);
afd1a0c9	436	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1da177e4 LT	437	}
1da177e4 LT	438
4abdcf93	439	subsys_initcall(init_dvbdev);
1da177e4 LT	440	module_exit(exit_dvbdev);
	441
	442	MODULE_DESCRIPTION("DVB Core Driver");
	443	MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
	444	MODULE_LICENSE("GPL");