[linux-2.6-block.git] / drivers / media / 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 DEFINE_MUTEX(dvbdev_mutex);
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"
};

#ifdef CONFIG_DVB_DYNAMIC_MINORS
#define MAX_DVB_MINORS		256
#define DVB_MAX_IDS		MAX_DVB_MINORS
#else
#define DVB_MAX_IDS		4
#define nums2minor(num,type,id)	((num << 6) | (id << 4) | type)
#define MAX_DVB_MINORS		(DVB_MAX_ADAPTERS*64)
#endif

static struct class *dvb_class;

static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
static DECLARE_RWSEM(minor_rwsem);

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

	mutex_lock(&dvbdev_mutex);
	down_read(&minor_rwsem);
	dvbdev = dvb_minors[iminor(inode)];

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

		new_fops = fops_get(dvbdev->fops);
		if (!new_fops)
			goto fail;
		file->private_data = dvbdev;
		replace_fops(file, new_fops);
		if (file->f_op->open)
			err = file->f_op->open(inode,file);
		up_read(&minor_rwsem);
		mutex_unlock(&dvbdev_mutex);
		return err;
	}
fail:
	up_read(&minor_rwsem);
	mutex_unlock(&dvbdev_mutex);
	return -ENODEV;
}


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

static struct cdev dvb_device_cdev;

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);


long dvb_generic_ioctl(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(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 dvb_device *dev;
		list_for_each_entry(dev, &adap->device_list, list_head)
			if (dev->type == type && dev->id == id)
				goto skip;
		return id;
skip:
		id++;
	}
	return -ENFILE;
}

static void dvb_create_media_entity(struct dvb_device *dvbdev,
				       int type, int minor)
{
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	int ret = 0, npads;

	switch (type) {
	case DVB_DEVICE_FRONTEND:
		npads = 2;
		break;
	case DVB_DEVICE_DEMUX:
		npads = 2;
		break;
	case DVB_DEVICE_CA:
		npads = 2;
		break;
	case DVB_DEVICE_NET:
		/*
		 * We should be creating entities for the MPE/ULE
		 * decapsulation hardware (or software implementation).
		 *
		 * However, the number of for the MPE/ULE decaps may not be
		 * fixed. As we don't have yet dynamic support for PADs at
		 * the Media Controller, let's not create the decap
		 * entities yet.
		 */
		return;
	default:
		return;
	}

	dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
	if (!dvbdev->entity)
		return;

	dvbdev->entity->info.dev.major = DVB_MAJOR;
	dvbdev->entity->info.dev.minor = minor;
	dvbdev->entity->name = dvbdev->name;

	if (npads) {
		dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
				       GFP_KERNEL);
		if (!dvbdev->pads) {
			kfree(dvbdev->entity);
			return;
		}
	}

	switch (type) {
	case DVB_DEVICE_FRONTEND:
		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_FE;
		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
		break;
	case DVB_DEVICE_DEMUX:
		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DEMUX;
		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
		break;
	case DVB_DEVICE_CA:
		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_CA;
		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
		break;
	default:
		kfree(dvbdev->entity);
		dvbdev->entity = NULL;
		return;
	}

	if (npads)
		ret = media_entity_init(dvbdev->entity, npads, dvbdev->pads);
	if (!ret)
		ret = media_device_register_entity(dvbdev->adapter->mdev,
						   dvbdev->entity);
	if (ret < 0) {
		printk(KERN_ERR
			"%s: media_device_register_entity failed for %s\n",
			__func__, dvbdev->entity->name);
		kfree(dvbdev->pads);
		kfree(dvbdev->entity);
		dvbdev->entity = NULL;
		return;
	}

	printk(KERN_DEBUG "%s: media entity '%s' registered.\n",
		__func__, dvbdev->entity->name);
#endif
}

static void dvb_register_media_device(struct dvb_device *dvbdev,
				      int type, int minor)
{
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	u32 intf_type;

	if (!dvbdev->adapter->mdev)
		return;

	dvb_create_media_entity(dvbdev, type, minor);

	switch (type) {
	case DVB_DEVICE_FRONTEND:
		intf_type = MEDIA_INTF_T_DVB_FE;
		break;
	case DVB_DEVICE_DEMUX:
		intf_type = MEDIA_INTF_T_DVB_DEMUX;
		break;
	case DVB_DEVICE_DVR:
		intf_type = MEDIA_INTF_T_DVB_DVR;
		break;
	case DVB_DEVICE_CA:
		intf_type = MEDIA_INTF_T_DVB_CA;
		break;
	case DVB_DEVICE_NET:
		intf_type = MEDIA_INTF_T_DVB_NET;
		break;
	default:
		return;
	}

	dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
						 intf_type, 0,
						 DVB_MAJOR, minor,
						 GFP_KERNEL);

	/*
	 * Create the "obvious" link, e. g. the ones that represent
	 * a direct association between an interface and an entity.
	 * Other links should be created elsewhere, like:
	 *		DVB FE intf    -> tuner
	 *		DVB demux intf -> dvr
	 */

	if (!dvbdev->entity || !dvbdev->intf_devnode)
		return;

	media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf, 0);

#endif
}

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 minor;
	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", __func__);
		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(dvbdevfops, template->fops, sizeof(struct file_operations));
	dvbdevfops->owner = adap->module;

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

	down_write(&minor_rwsem);
#ifdef CONFIG_DVB_DYNAMIC_MINORS
	for (minor = 0; minor < MAX_DVB_MINORS; minor++)
		if (dvb_minors[minor] == NULL)
			break;

	if (minor == MAX_DVB_MINORS) {
		kfree(dvbdevfops);
		kfree(dvbdev);
		up_write(&minor_rwsem);
		mutex_unlock(&dvbdev_register_lock);
		return -EINVAL;
	}
#else
	minor = nums2minor(adap->num, type, id);
#endif

	dvbdev->minor = minor;
	dvb_minors[minor] = dvbdev;
	up_write(&minor_rwsem);

	mutex_unlock(&dvbdev_register_lock);

	clsdev = device_create(dvb_class, adap->device,
			       MKDEV(DVB_MAJOR, minor),
			       dvbdev, "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",
		       __func__, 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, minor, minor);

	dvb_register_media_device(dvbdev, type, minor);

	return 0;
}
EXPORT_SYMBOL(dvb_register_device);


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

	down_write(&minor_rwsem);
	dvb_minors[dvbdev->minor] = NULL;
	up_write(&minor_rwsem);

	device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));

#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	if (dvbdev->entity) {
		media_device_unregister_entity(dvbdev->entity);
		kfree(dvbdev->entity);
		kfree(dvbdev->pads);
	}
#endif

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


#ifdef CONFIG_MEDIA_CONTROLLER_DVB
void dvb_create_media_graph(struct dvb_adapter *adap)
{
	struct media_device *mdev = adap->mdev;
	struct media_entity *entity, *tuner = NULL, *fe = NULL;
	struct media_entity *demux = NULL, *dvr = NULL, *ca = NULL;

	if (!mdev)
		return;

	media_device_for_each_entity(entity, mdev) {
		switch (entity->type) {
		case MEDIA_ENT_T_V4L2_SUBDEV_TUNER:
			tuner = entity;
			break;
		case MEDIA_ENT_T_DEVNODE_DVB_FE:
			fe = entity;
			break;
		case MEDIA_ENT_T_DEVNODE_DVB_DEMUX:
			demux = entity;
			break;
		case MEDIA_ENT_T_DEVNODE_DVB_DVR:
			dvr = entity;
			break;
		case MEDIA_ENT_T_DEVNODE_DVB_CA:
			ca = entity;
			break;
		}
	}

	if (tuner && fe)
		media_create_pad_link(tuner, 0, fe, 0, 0);

	if (fe && demux)
		media_create_pad_link(fe, 1, demux, 0, MEDIA_LNK_FL_ENABLED);

	if (demux && dvr)
		media_create_pad_link(demux, 1, dvr, 0, MEDIA_LNK_FL_ENABLED);

	if (demux && ca)
		media_create_pad_link(demux, 1, ca, 0, MEDIA_LNK_FL_ENABLED);
}
EXPORT_SYMBOL_GPL(dvb_create_media_graph);
#endif

static int dvbdev_check_free_adapter_num(int num)
{
	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)
			return 0;
	}
	return 1;
}

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

	while (num < DVB_MAX_ADAPTERS) {
		if (dvbdev_check_free_adapter_num(num))
			return num;
		num++;
	}

	return -ENFILE;
}


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

	mutex_lock(&dvbdev_register_lock);

	for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
		num = adapter_nums[i];
		if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
		/* use the one the driver asked for */
			if (dvbdev_check_free_adapter_num(num))
				break;
		} else {
			num = dvbdev_get_free_adapter_num();
			break;
		}
		num = -1;
	}

	if (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;
	adap->mfe_shared = 0;
	adap->mfe_dvbdev = NULL;
	mutex_init (&adap->mfe_lock);

	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 file *file,
		     unsigned int cmd, unsigned long arg,
		     int (*func)(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(file, cmd, parg)) == -ENOIOCTLCMD)
		err = -ENOTTY;

	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 dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct dvb_device *dvbdev = dev_get_drvdata(dev);

	add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
	add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
	add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
	return 0;
}

static char *dvb_devnode(struct device *dev, umode_t *mode)
{
	struct dvb_device *dvbdev = dev_get_drvdata(dev);

	return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
		dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
}


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;
	}
	dvb_class->dev_uevent = dvb_uevent;
	dvb_class->devnode = dvb_devnode;
	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"
1da177e4 LT	36
72024f1e	37	static DEFINE_MUTEX(dvbdev_mutex);
1da177e4 LT	38	static int dvbdev_debug;
	39
	40	module_param(dvbdev_debug, int, 0644);
	41	MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
	42
	43	#define dprintk if (dvbdev_debug) printk
	44
	45	static LIST_HEAD(dvb_adapter_list);
1e4baed3	46	static DEFINE_MUTEX(dvbdev_register_lock);
1da177e4 LT	47
1da177e4 LT	48	static const char * const dnames[] = {
afd1a0c9	49	"video", "audio", "sec", "frontend", "demux", "dvr", "ca",
1da177e4 LT	50	"net", "osd"
	51	};
	52
5dd3f307 AO	53	#ifdef CONFIG_DVB_DYNAMIC_MINORS
	54	#define MAX_DVB_MINORS 256
	55	#define DVB_MAX_IDS MAX_DVB_MINORS
	56	#else
1da177e4 LT	57	#define DVB_MAX_IDS 4
	58	#define nums2minor(num,type,id) ((num << 6) \| (id << 4) \| type)
	59	#define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
5dd3f307	60	#endif
1da177e4	61
56b22935	62	static struct class *dvb_class;
1da177e4	63
5dd3f307 AO	64	static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
5dd3f307 AO	65	static DECLARE_RWSEM(minor_rwsem);
1da177e4 LT	66
	67	static int dvb_device_open(struct inode inode, struct file file)
	68	{
	69	struct dvb_device *dvbdev;
	70
72024f1e	71	mutex_lock(&dvbdev_mutex);
5dd3f307 AO	72	down_read(&minor_rwsem);
5dd3f307 AO	73	dvbdev = dvb_minors[iminor(inode)];
1da177e4 LT	74
	75	if (dvbdev && dvbdev->fops) {
	76	int err = 0;
e84f9e57	77	const struct file_operations *new_fops;
1da177e4	78
e84f9e57 AV	79	new_fops = fops_get(dvbdev->fops);
e84f9e57 AV	80	if (!new_fops)
f41ced8f	81	goto fail;
e84f9e57 AV	82	file->private_data = dvbdev;
	83	replace_fops(file, new_fops);
	84	if (file->f_op->open)
50c25fff	85	err = file->f_op->open(inode,file);
5dd3f307	86	up_read(&minor_rwsem);
72024f1e	87	mutex_unlock(&dvbdev_mutex);
afd1a0c9	88	return err;
1da177e4	89	}
f41ced8f	90	fail:
5dd3f307	91	up_read(&minor_rwsem);
72024f1e	92	mutex_unlock(&dvbdev_mutex);
1da177e4 LT	93	return -ENODEV;
	94	}
	95
	96
27a643b1	97	static const struct file_operations dvb_device_fops =
1da177e4 LT	98	{
	99	.owner = THIS_MODULE,
	100	.open = dvb_device_open,
6038f373	101	.llseek = noop_llseek,
1da177e4 LT	102	};
1da177e4 LT	103
7e7654a9	104	static struct cdev dvb_device_cdev;
1da177e4 LT	105
	106	int dvb_generic_open(struct inode inode, struct file file)
	107	{
afd1a0c9	108	struct dvb_device *dvbdev = file->private_data;
1da177e4	109
afd1a0c9 MCC	110	if (!dvbdev)
afd1a0c9 MCC	111	return -ENODEV;
1da177e4 LT	112
1da177e4 LT	113	if (!dvbdev->users)
afd1a0c9	114	return -EBUSY;
1da177e4 LT	115
1da177e4 LT	116	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
afd1a0c9 MCC	117	if (!dvbdev->readers)
afd1a0c9 MCC	118	return -EBUSY;
1da177e4 LT	119	dvbdev->readers--;
1da177e4 LT	120	} else {
afd1a0c9 MCC	121	if (!dvbdev->writers)
afd1a0c9 MCC	122	return -EBUSY;
1da177e4 LT	123	dvbdev->writers--;
	124	}
	125
	126	dvbdev->users--;
	127	return 0;
	128	}
	129	EXPORT_SYMBOL(dvb_generic_open);
	130
	131
	132	int dvb_generic_release(struct inode inode, struct file file)
	133	{
afd1a0c9	134	struct dvb_device *dvbdev = file->private_data;
1da177e4 LT	135
1da177e4 LT	136	if (!dvbdev)
afd1a0c9	137	return -ENODEV;
1da177e4 LT	138
	139	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
	140	dvbdev->readers++;
	141	} else {
	142	dvbdev->writers++;
	143	}
	144
	145	dvbdev->users++;
	146	return 0;
	147	}
	148	EXPORT_SYMBOL(dvb_generic_release);
	149
	150
16ef8def AB	151	long dvb_generic_ioctl(struct file *file,
16ef8def AB	152	unsigned int cmd, unsigned long arg)
1da177e4	153	{
afd1a0c9	154	struct dvb_device *dvbdev = file->private_data;
1da177e4	155
afd1a0c9 MCC	156	if (!dvbdev)
afd1a0c9 MCC	157	return -ENODEV;
1da177e4 LT	158
	159	if (!dvbdev->kernel_ioctl)
	160	return -EINVAL;
	161
72024f1e	162	return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
1da177e4 LT	163	}
	164	EXPORT_SYMBOL(dvb_generic_ioctl);
	165
	166
	167	static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
	168	{
	169	u32 id = 0;
	170
	171	while (id < DVB_MAX_IDS) {
79482619 TP	172	struct dvb_device *dev;
79482619 TP	173	list_for_each_entry(dev, &adap->device_list, list_head)
1da177e4 LT	174	if (dev->type == type && dev->id == id)
1da177e4 LT	175	goto skip;
1da177e4 LT	176	return id;
	177	skip:
	178	id++;
	179	}
	180	return -ENFILE;
	181	}
	182
8211b187 MCC	183	static void dvb_create_media_entity(struct dvb_device *dvbdev,
8211b187 MCC	184	int type, int minor)
a0246e02 MCC	185	{
a0246e02 MCC	186	#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
172e9d3c	187	int ret = 0, npads;
a0246e02	188
8211b187 MCC	189	switch (type) {
	190	case DVB_DEVICE_FRONTEND:
	191	npads = 2;
	192	break;
	193	case DVB_DEVICE_DEMUX:
	194	npads = 2;
	195	break;
	196	case DVB_DEVICE_CA:
	197	npads = 2;
	198	break;
	199	case DVB_DEVICE_NET:
	200	/*
	201	* We should be creating entities for the MPE/ULE
	202	* decapsulation hardware (or software implementation).
	203	*
	204	* However, the number of for the MPE/ULE decaps may not be
	205	* fixed. As we don't have yet dynamic support for PADs at
	206	* the Media Controller, let's not create the decap
	207	* entities yet.
	208	*/
	209	return;
	210	default:
a0246e02	211	return;
8211b187	212	}
a0246e02 MCC	213
	214	dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
	215	if (!dvbdev->entity)
	216	return;
	217
	218	dvbdev->entity->info.dev.major = DVB_MAJOR;
	219	dvbdev->entity->info.dev.minor = minor;
	220	dvbdev->entity->name = dvbdev->name;
172e9d3c	221
172e9d3c MCC	222	if (npads) {
	223	dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
	224	GFP_KERNEL);
	225	if (!dvbdev->pads) {
	226	kfree(dvbdev->entity);
	227	return;
	228	}
	229	}
	230
a0246e02 MCC	231	switch (type) {
	232	case DVB_DEVICE_FRONTEND:
	233	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_FE;
3bde1b78 MCC	234	dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
3bde1b78 MCC	235	dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
a0246e02 MCC	236	break;
	237	case DVB_DEVICE_DEMUX:
	238	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DEMUX;
3bde1b78 MCC	239	dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
3bde1b78 MCC	240	dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
a0246e02	241	break;
a0246e02 MCC	242	case DVB_DEVICE_CA:
a0246e02 MCC	243	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_CA;
3bde1b78 MCC	244	dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
3bde1b78 MCC	245	dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
a0246e02	246	break;
a0246e02 MCC	247	default:
	248	kfree(dvbdev->entity);
	249	dvbdev->entity = NULL;
	250	return;
	251	}
	252
172e9d3c	253	if (npads)
18095107	254	ret = media_entity_init(dvbdev->entity, npads, dvbdev->pads);
172e9d3c MCC	255	if (!ret)
	256	ret = media_device_register_entity(dvbdev->adapter->mdev,
	257	dvbdev->entity);
a0246e02 MCC	258	if (ret < 0) {
	259	printk(KERN_ERR
	260	"%s: media_device_register_entity failed for %s\n",
	261	__func__, dvbdev->entity->name);
172e9d3c	262	kfree(dvbdev->pads);
a0246e02 MCC	263	kfree(dvbdev->entity);
	264	dvbdev->entity = NULL;
	265	return;
	266	}
	267
8211b187	268	printk(KERN_DEBUG "%s: media entity '%s' registered.\n",
a0246e02 MCC	269	__func__, dvbdev->entity->name);
	270	#endif
	271	}
1da177e4	272
8211b187 MCC	273	static void dvb_register_media_device(struct dvb_device *dvbdev,
	274	int type, int minor)
	275	{
	276	#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	277	u32 intf_type;
	278
	279	if (!dvbdev->adapter->mdev)
	280	return;
	281
	282	dvb_create_media_entity(dvbdev, type, minor);
	283
	284	switch (type) {
	285	case DVB_DEVICE_FRONTEND:
	286	intf_type = MEDIA_INTF_T_DVB_FE;
	287	break;
	288	case DVB_DEVICE_DEMUX:
	289	intf_type = MEDIA_INTF_T_DVB_DEMUX;
	290	break;
	291	case DVB_DEVICE_DVR:
	292	intf_type = MEDIA_INTF_T_DVB_DVR;
	293	break;
	294	case DVB_DEVICE_CA:
	295	intf_type = MEDIA_INTF_T_DVB_CA;
	296	break;
	297	case DVB_DEVICE_NET:
	298	intf_type = MEDIA_INTF_T_DVB_NET;
	299	break;
	300	default:
	301	return;
	302	}
	303
	304	dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
	305	intf_type, 0,
	306	DVB_MAJOR, minor,
	307	GFP_KERNEL);
	308
	309	/*
	310	* Create the "obvious" link, e. g. the ones that represent
	311	* a direct association between an interface and an entity.
	312	* Other links should be created elsewhere, like:
	313	* DVB FE intf -> tuner
	314	* DVB demux intf -> dvr
	315	*/
	316
	317	if (!dvbdev->entity \|\| !dvbdev->intf_devnode)
	318	return;
	319
	320	media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf, 0);
	321
	322	#endif
	323	}
	324
1da177e4 LT	325	int dvb_register_device(struct dvb_adapter adap, struct dvb_device *pdvbdev,
	326	const struct dvb_device template, void priv, int type)
	327	{
	328	struct dvb_device *dvbdev;
b6190102	329	struct file_operations *dvbdevfops;
5f553388	330	struct device *clsdev;
5dd3f307	331	int minor;
1da177e4 LT	332	int id;
1da177e4 LT	333
c2788502	334	mutex_lock(&dvbdev_register_lock);
1da177e4	335
b6190102	336	if ((id = dvbdev_get_free_id (adap, type)) < 0){
1e4baed3	337	mutex_unlock(&dvbdev_register_lock);
1da177e4	338	*pdvbdev = NULL;
46b4f7c1	339	printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
1da177e4 LT	340	return -ENFILE;
	341	}
	342
	343	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
	344
b6190102 MS	345	if (!dvbdev){
	346	mutex_unlock(&dvbdev_register_lock);
	347	return -ENOMEM;
	348	}
	349
	350	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
	351
	352	if (!dvbdevfops){
	353	kfree (dvbdev);
1e4baed3	354	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	355	return -ENOMEM;
	356	}
	357
1da177e4 LT	358	memcpy(dvbdev, template, sizeof(struct dvb_device));
	359	dvbdev->type = type;
	360	dvbdev->id = id;
	361	dvbdev->adapter = adap;
	362	dvbdev->priv = priv;
b6190102	363	dvbdev->fops = dvbdevfops;
ca5be9cd	364	init_waitqueue_head (&dvbdev->wait_queue);
1da177e4	365
784e29d2 JE	366	memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
784e29d2 JE	367	dvbdevfops->owner = adap->module;
1da177e4 LT	368
	369	list_add_tail (&dvbdev->list_head, &adap->device_list);
	370
5dd3f307 AO	371	down_write(&minor_rwsem);
	372	#ifdef CONFIG_DVB_DYNAMIC_MINORS
	373	for (minor = 0; minor < MAX_DVB_MINORS; minor++)
	374	if (dvb_minors[minor] == NULL)
	375	break;
	376
	377	if (minor == MAX_DVB_MINORS) {
	378	kfree(dvbdevfops);
	379	kfree(dvbdev);
82163edc	380	up_write(&minor_rwsem);
5dd3f307 AO	381	mutex_unlock(&dvbdev_register_lock);
	382	return -EINVAL;
	383	}
	384	#else
	385	minor = nums2minor(adap->num, type, id);
	386	#endif
	387
	388	dvbdev->minor = minor;
	389	dvb_minors[minor] = dvbdev;
	390	up_write(&minor_rwsem);
	391
f47f4763 AQ	392	mutex_unlock(&dvbdev_register_lock);
f47f4763 AQ	393
a9b12619	394	clsdev = device_create(dvb_class, adap->device,
b7496780	395	MKDEV(DVB_MAJOR, minor),
a5f4c0ce	396	dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
4abdcf93 SA	397	if (IS_ERR(clsdev)) {
4abdcf93 SA	398	printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
46b4f7c1	399	__func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
4abdcf93 SA	400	return PTR_ERR(clsdev);
4abdcf93 SA	401	}
900858ec	402	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
5dd3f307	403	adap->num, dnames[type], id, minor, minor);
1da177e4	404
a0246e02 MCC	405	dvb_register_media_device(dvbdev, type, minor);
a0246e02 MCC	406
1da177e4 LT	407	return 0;
	408	}
	409	EXPORT_SYMBOL(dvb_register_device);
	410
	411
	412	void dvb_unregister_device(struct dvb_device *dvbdev)
	413	{
	414	if (!dvbdev)
	415	return;
	416
5dd3f307 AO	417	down_write(&minor_rwsem);
	418	dvb_minors[dvbdev->minor] = NULL;
	419	up_write(&minor_rwsem);
	420
	421	device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
1da177e4	422
a0246e02 MCC	423	#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	424	if (dvbdev->entity) {
	425	media_device_unregister_entity(dvbdev->entity);
	426	kfree(dvbdev->entity);
172e9d3c	427	kfree(dvbdev->pads);
a0246e02 MCC	428	}
	429	#endif
	430
1da177e4	431	list_del (&dvbdev->list_head);
b6190102	432	kfree (dvbdev->fops);
1da177e4 LT	433	kfree (dvbdev);
	434	}
	435	EXPORT_SYMBOL(dvb_unregister_device);
	436
4155109a	437
4155109a	438	#ifdef CONFIG_MEDIA_CONTROLLER_DVB
480884b6 MCC	439	void dvb_create_media_graph(struct dvb_adapter *adap)
	440	{
	441	struct media_device *mdev = adap->mdev;
4155109a MCC	442	struct media_entity entity, tuner = NULL, *fe = NULL;
	443	struct media_entity demux = NULL, dvr = NULL, *ca = NULL;
	444
	445	if (!mdev)
	446	return;
	447
	448	media_device_for_each_entity(entity, mdev) {
	449	switch (entity->type) {
	450	case MEDIA_ENT_T_V4L2_SUBDEV_TUNER:
	451	tuner = entity;
	452	break;
	453	case MEDIA_ENT_T_DEVNODE_DVB_FE:
	454	fe = entity;
	455	break;
	456	case MEDIA_ENT_T_DEVNODE_DVB_DEMUX:
	457	demux = entity;
	458	break;
	459	case MEDIA_ENT_T_DEVNODE_DVB_DVR:
	460	dvr = entity;
	461	break;
	462	case MEDIA_ENT_T_DEVNODE_DVB_CA:
	463	ca = entity;
	464	break;
	465	}
	466	}
	467
	468	if (tuner && fe)
8df00a15	469	media_create_pad_link(tuner, 0, fe, 0, 0);
4155109a MCC	470
4155109a MCC	471	if (fe && demux)
8df00a15	472	media_create_pad_link(fe, 1, demux, 0, MEDIA_LNK_FL_ENABLED);
4155109a MCC	473
4155109a MCC	474	if (demux && dvr)
8df00a15	475	media_create_pad_link(demux, 1, dvr, 0, MEDIA_LNK_FL_ENABLED);
4155109a MCC	476
4155109a MCC	477	if (demux && ca)
8df00a15	478	media_create_pad_link(demux, 1, ca, 0, MEDIA_LNK_FL_ENABLED);
4155109a MCC	479	}
4155109a MCC	480	EXPORT_SYMBOL_GPL(dvb_create_media_graph);
480884b6	481	#endif
4155109a	482
78e92006 JG	483	static int dvbdev_check_free_adapter_num(int num)
	484	{
	485	struct list_head *entry;
	486	list_for_each(entry, &dvb_adapter_list) {
	487	struct dvb_adapter *adap;
	488	adap = list_entry(entry, struct dvb_adapter, list_head);
	489	if (adap->num == num)
	490	return 0;
	491	}
	492	return 1;
	493	}
1da177e4 LT	494
	495	static int dvbdev_get_free_adapter_num (void)
	496	{
	497	int num = 0;
	498
	499	while (num < DVB_MAX_ADAPTERS) {
78e92006 JG	500	if (dvbdev_check_free_adapter_num(num))
78e92006 JG	501	return num;
1da177e4 LT	502	num++;
	503	}
	504
	505	return -ENFILE;
	506	}
	507
	508
78e92006 JG	509	int dvb_register_adapter(struct dvb_adapter adap, const char name,
	510	struct module module, struct device device,
	511	short *adapter_nums)
1da177e4	512	{
78e92006	513	int i, num;
1da177e4	514
c2788502	515	mutex_lock(&dvbdev_register_lock);
1da177e4	516
78e92006 JG	517	for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
	518	num = adapter_nums[i];
	519	if (num >= 0 && num < DVB_MAX_ADAPTERS) {
	520	/* use the one the driver asked for */
	521	if (dvbdev_check_free_adapter_num(num))
	522	break;
	523	} else {
	524	num = dvbdev_get_free_adapter_num();
	525	break;
	526	}
	527	num = -1;
	528	}
	529
	530	if (num < 0) {
1e4baed3	531	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	532	return -ENFILE;
	533	}
	534
1da177e4 LT	535	memset (adap, 0, sizeof(struct dvb_adapter));
	536	INIT_LIST_HEAD (&adap->device_list);
	537
900858ec	538	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
1da177e4	539
1da177e4 LT	540	adap->num = num;
	541	adap->name = name;
	542	adap->module = module;
d09dbf92	543	adap->device = device;
59b1842d DB	544	adap->mfe_shared = 0;
	545	adap->mfe_dvbdev = NULL;
	546	mutex_init (&adap->mfe_lock);
1da177e4 LT	547
	548	list_add_tail (&adap->list_head, &dvb_adapter_list);
	549
1e4baed3	550	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	551
	552	return num;
	553	}
	554	EXPORT_SYMBOL(dvb_register_adapter);
	555
	556
	557	int dvb_unregister_adapter(struct dvb_adapter *adap)
	558	{
c2788502	559	mutex_lock(&dvbdev_register_lock);
1da177e4	560	list_del (&adap->list_head);
1e4baed3	561	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	562	return 0;
	563	}
	564	EXPORT_SYMBOL(dvb_unregister_adapter);
	565
	566	/* if the miracle happens and "generic_usercopy()" is included into
	567	the kernel, then this can vanish. please don't make the mistake and
	568	define this as video_usercopy(). this will introduce a dependecy
	569	to the v4l "videodev.o" module, which is unnecessary for some
	570	cards (ie. the budget dvb-cards don't need the v4l module...) */
16ef8def	571	int dvb_usercopy(struct file *file,
afd1a0c9	572	unsigned int cmd, unsigned long arg,
16ef8def	573	int (func)(struct file file,
1da177e4 LT	574	unsigned int cmd, void *arg))
1da177e4 LT	575	{
afd1a0c9 MCC	576	char sbuf[128];
	577	void *mbuf = NULL;
	578	void *parg = NULL;
	579	int err = -EINVAL;
	580
	581	/* Copy arguments into temp kernel buffer */
	582	switch (_IOC_DIR(cmd)) {
	583	case _IOC_NONE:
1da177e4 LT	584	/*
	585	* For this command, the pointer is actually an integer
	586	* argument.
	587	*/
	588	parg = (void *) arg;
	589	break;
afd1a0c9 MCC	590	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	591	case _IOC_WRITE:
	592	case (_IOC_WRITE \| _IOC_READ):
	593	if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
50c25fff	594	parg = sbuf;
afd1a0c9	595	} else {
50c25fff MK	596	/* too big to allocate from stack */
	597	mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
	598	if (NULL == mbuf)
	599	return -ENOMEM;
	600	parg = mbuf;
afd1a0c9 MCC	601	}
	602
	603	err = -EFAULT;
	604	if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
50c25fff	605	goto out;
afd1a0c9 MCC	606	break;
	607	}
	608
	609	/* call driver */
16ef8def	610	if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
d9751fd0	611	err = -ENOTTY;
afd1a0c9 MCC	612
	613	if (err < 0)
	614	goto out;
	615
	616	/* Copy results into user buffer */
	617	switch (_IOC_DIR(cmd))
	618	{
	619	case _IOC_READ:
	620	case (_IOC_WRITE \| _IOC_READ):
	621	if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
50c25fff	622	err = -EFAULT;
afd1a0c9 MCC	623	break;
afd1a0c9 MCC	624	}
1da177e4 LT	625
1da177e4 LT	626	out:
afd1a0c9 MCC	627	kfree(mbuf);
afd1a0c9 MCC	628	return err;
1da177e4 LT	629	}
1da177e4 LT	630
a5f4c0ce KS	631	static int dvb_uevent(struct device dev, struct kobj_uevent_env env)
	632	{
	633	struct dvb_device *dvbdev = dev_get_drvdata(dev);
	634
a5f4c0ce	635	add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
763d19bb KS	636	add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
763d19bb KS	637	add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
a5f4c0ce KS	638	return 0;
	639	}
	640
2c9ede55	641	static char dvb_devnode(struct device dev, umode_t *mode)
8a8bdcc7 KS	642	{
	643	struct dvb_device *dvbdev = dev_get_drvdata(dev);
	644
	645	return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
	646	dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
	647	}
	648
	649
1da177e4 LT	650	static int __init init_dvbdev(void)
	651	{
	652	int retval;
	653	dev_t dev = MKDEV(DVB_MAJOR, 0);
	654
	655	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
900858ec	656	printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
1da177e4 LT	657	return retval;
	658	}
	659
	660	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	661	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
900858ec	662	printk(KERN_ERR "dvb-core: unable register character device\n");
1da177e4 LT	663	goto error;
	664	}
	665
56b22935	666	dvb_class = class_create(THIS_MODULE, "dvb");
1da177e4 LT	667	if (IS_ERR(dvb_class)) {
	668	retval = PTR_ERR(dvb_class);
	669	goto error;
	670	}
a5f4c0ce	671	dvb_class->dev_uevent = dvb_uevent;
e454cea2	672	dvb_class->devnode = dvb_devnode;
1da177e4 LT	673	return 0;
	674
	675	error:
	676	cdev_del(&dvb_device_cdev);
	677	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	678	return retval;
	679	}
	680
	681
	682	static void __exit exit_dvbdev(void)
	683	{
56b22935	684	class_destroy(dvb_class);
1da177e4	685	cdev_del(&dvb_device_cdev);
afd1a0c9	686	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1da177e4 LT	687	}
1da177e4 LT	688
4abdcf93	689	subsys_initcall(init_dvbdev);
1da177e4 LT	690	module_exit(exit_dvbdev);
	691
	692	MODULE_DESCRIPTION("DVB Core Driver");
	693	MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
	694	MODULE_LICENSE("GPL");