[deliverable/linux.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/moduleparam.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 class_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 ("%s: could get 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 = class_device_create(dvb_class, NULL, MKDEV(DVB_MAJOR,
				     nums2minor(adap->num, type, id)),
				     adap->device, "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("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;

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