[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/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 <linux/smp_lock.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_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 dvb_adapter *adap;

	list_for_each_entry(adap, &dvb_adapter_list, list_head) {
		struct dvb_device *dev;
		list_for_each_entry(dev, &adap->device_list, 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;

	lock_kernel();
	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);
		unlock_kernel();
		return err;
	}
	unlock_kernel();
	return -ENODEV;
}


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

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);


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 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;
}


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", __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(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)),
			       NULL, "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, 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_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;

	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>
5794e1b1	35	#include <linux/smp_lock.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
1da177e4 LT	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	{
79482619	61	struct dvb_adapter *adap;
1da177e4	62
79482619 TP	63	list_for_each_entry(adap, &dvb_adapter_list, list_head) {
	64	struct dvb_device *dev;
	65	list_for_each_entry(dev, &adap->device_list, list_head)
1da177e4 LT	66	if (nums2minor(adap->num, dev->type, dev->id) == minor)
1da177e4 LT	67	return dev;
1da177e4 LT	68	}
	69
	70	return NULL;
	71	}
	72
	73
	74	static int dvb_device_open(struct inode inode, struct file file)
	75	{
	76	struct dvb_device *dvbdev;
	77
5794e1b1	78	lock_kernel();
1da177e4 LT	79	dvbdev = dvbdev_find_device (iminor(inode));
	80
	81	if (dvbdev && dvbdev->fops) {
	82	int err = 0;
99ac48f5	83	const struct file_operations *old_fops;
1da177e4 LT	84
	85	file->private_data = dvbdev;
	86	old_fops = file->f_op;
afd1a0c9 MCC	87	file->f_op = fops_get(dvbdev->fops);
afd1a0c9 MCC	88	if(file->f_op->open)
50c25fff	89	err = file->f_op->open(inode,file);
afd1a0c9	90	if (err) {
50c25fff MK	91	fops_put(file->f_op);
50c25fff MK	92	file->f_op = fops_get(old_fops);
afd1a0c9 MCC	93	}
afd1a0c9 MCC	94	fops_put(old_fops);
5794e1b1	95	unlock_kernel();
afd1a0c9	96	return err;
1da177e4	97	}
5794e1b1	98	unlock_kernel();
1da177e4 LT	99	return -ENODEV;
	100	}
	101
	102
27a643b1	103	static const struct file_operations dvb_device_fops =
1da177e4 LT	104	{
	105	.owner = THIS_MODULE,
	106	.open = dvb_device_open,
	107	};
	108
7e7654a9	109	static struct cdev dvb_device_cdev;
1da177e4 LT	110
	111	int dvb_generic_open(struct inode inode, struct file file)
	112	{
afd1a0c9	113	struct dvb_device *dvbdev = file->private_data;
1da177e4	114
afd1a0c9 MCC	115	if (!dvbdev)
afd1a0c9 MCC	116	return -ENODEV;
1da177e4 LT	117
1da177e4 LT	118	if (!dvbdev->users)
afd1a0c9	119	return -EBUSY;
1da177e4 LT	120
1da177e4 LT	121	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
afd1a0c9 MCC	122	if (!dvbdev->readers)
afd1a0c9 MCC	123	return -EBUSY;
1da177e4 LT	124	dvbdev->readers--;
1da177e4 LT	125	} else {
afd1a0c9 MCC	126	if (!dvbdev->writers)
afd1a0c9 MCC	127	return -EBUSY;
1da177e4 LT	128	dvbdev->writers--;
	129	}
	130
	131	dvbdev->users--;
	132	return 0;
	133	}
	134	EXPORT_SYMBOL(dvb_generic_open);
	135
	136
	137	int dvb_generic_release(struct inode inode, struct file file)
	138	{
afd1a0c9	139	struct dvb_device *dvbdev = file->private_data;
1da177e4 LT	140
1da177e4 LT	141	if (!dvbdev)
afd1a0c9	142	return -ENODEV;
1da177e4 LT	143
	144	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
	145	dvbdev->readers++;
	146	} else {
	147	dvbdev->writers++;
	148	}
	149
	150	dvbdev->users++;
	151	return 0;
	152	}
	153	EXPORT_SYMBOL(dvb_generic_release);
	154
	155
	156	int dvb_generic_ioctl(struct inode inode, struct file file,
	157	unsigned int cmd, unsigned long arg)
	158	{
afd1a0c9	159	struct dvb_device *dvbdev = file->private_data;
1da177e4	160
afd1a0c9 MCC	161	if (!dvbdev)
afd1a0c9 MCC	162	return -ENODEV;
1da177e4 LT	163
	164	if (!dvbdev->kernel_ioctl)
	165	return -EINVAL;
	166
	167	return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl);
	168	}
	169	EXPORT_SYMBOL(dvb_generic_ioctl);
	170
	171
	172	static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
	173	{
	174	u32 id = 0;
	175
	176	while (id < DVB_MAX_IDS) {
79482619 TP	177	struct dvb_device *dev;
79482619 TP	178	list_for_each_entry(dev, &adap->device_list, list_head)
1da177e4 LT	179	if (dev->type == type && dev->id == id)
1da177e4 LT	180	goto skip;
1da177e4 LT	181	return id;
	182	skip:
	183	id++;
	184	}
	185	return -ENFILE;
	186	}
	187
	188
	189	int dvb_register_device(struct dvb_adapter adap, struct dvb_device *pdvbdev,
	190	const struct dvb_device template, void priv, int type)
	191	{
	192	struct dvb_device *dvbdev;
b6190102	193	struct file_operations *dvbdevfops;
5f553388	194	struct device *clsdev;
1da177e4 LT	195	int id;
1da177e4 LT	196
c2788502	197	mutex_lock(&dvbdev_register_lock);
1da177e4	198
b6190102	199	if ((id = dvbdev_get_free_id (adap, type)) < 0){
1e4baed3	200	mutex_unlock(&dvbdev_register_lock);
1da177e4	201	*pdvbdev = NULL;
46b4f7c1	202	printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
1da177e4 LT	203	return -ENFILE;
	204	}
	205
	206	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
	207
b6190102 MS	208	if (!dvbdev){
	209	mutex_unlock(&dvbdev_register_lock);
	210	return -ENOMEM;
	211	}
	212
	213	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
	214
	215	if (!dvbdevfops){
	216	kfree (dvbdev);
1e4baed3	217	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	218	return -ENOMEM;
	219	}
	220
1da177e4 LT	221	memcpy(dvbdev, template, sizeof(struct dvb_device));
	222	dvbdev->type = type;
	223	dvbdev->id = id;
	224	dvbdev->adapter = adap;
	225	dvbdev->priv = priv;
b6190102	226	dvbdev->fops = dvbdevfops;
ca5be9cd	227	init_waitqueue_head (&dvbdev->wait_queue);
1da177e4	228
b6190102	229	memcpy(dvbdev->fops, template->fops, sizeof(struct file_operations));
1da177e4 LT	230	dvbdev->fops->owner = adap->module;
	231
	232	list_add_tail (&dvbdev->list_head, &adap->device_list);
	233
f47f4763 AQ	234	mutex_unlock(&dvbdev_register_lock);
f47f4763 AQ	235
a9b12619	236	clsdev = device_create(dvb_class, adap->device,
5f553388	237	MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
e282959e	238	NULL, "dvb%d.%s%d", adap->num, dnames[type], id);
4abdcf93 SA	239	if (IS_ERR(clsdev)) {
4abdcf93 SA	240	printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
46b4f7c1	241	__func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
4abdcf93 SA	242	return PTR_ERR(clsdev);
4abdcf93 SA	243	}
1da177e4	244
900858ec	245	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
1da177e4 LT	246	adap->num, dnames[type], id, nums2minor(adap->num, type, id),
	247	nums2minor(adap->num, type, id));
	248
	249	return 0;
	250	}
	251	EXPORT_SYMBOL(dvb_register_device);
	252
	253
	254	void dvb_unregister_device(struct dvb_device *dvbdev)
	255	{
	256	if (!dvbdev)
	257	return;
	258
5f553388 KS	259	device_destroy(dvb_class, MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num,
5f553388 KS	260	dvbdev->type, dvbdev->id)));
1da177e4 LT	261
1da177e4 LT	262	list_del (&dvbdev->list_head);
b6190102	263	kfree (dvbdev->fops);
1da177e4 LT	264	kfree (dvbdev);
	265	}
	266	EXPORT_SYMBOL(dvb_unregister_device);
	267
78e92006 JG	268	static int dvbdev_check_free_adapter_num(int num)
	269	{
	270	struct list_head *entry;
	271	list_for_each(entry, &dvb_adapter_list) {
	272	struct dvb_adapter *adap;
	273	adap = list_entry(entry, struct dvb_adapter, list_head);
	274	if (adap->num == num)
	275	return 0;
	276	}
	277	return 1;
	278	}
1da177e4 LT	279
	280	static int dvbdev_get_free_adapter_num (void)
	281	{
	282	int num = 0;
	283
	284	while (num < DVB_MAX_ADAPTERS) {
78e92006 JG	285	if (dvbdev_check_free_adapter_num(num))
78e92006 JG	286	return num;
1da177e4 LT	287	num++;
	288	}
	289
	290	return -ENFILE;
	291	}
	292
	293
78e92006 JG	294	int dvb_register_adapter(struct dvb_adapter adap, const char name,
	295	struct module module, struct device device,
	296	short *adapter_nums)
1da177e4	297	{
78e92006	298	int i, num;
1da177e4	299
c2788502	300	mutex_lock(&dvbdev_register_lock);
1da177e4	301
78e92006 JG	302	for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
	303	num = adapter_nums[i];
	304	if (num >= 0 && num < DVB_MAX_ADAPTERS) {
	305	/* use the one the driver asked for */
	306	if (dvbdev_check_free_adapter_num(num))
	307	break;
	308	} else {
	309	num = dvbdev_get_free_adapter_num();
	310	break;
	311	}
	312	num = -1;
	313	}
	314
	315	if (num < 0) {
1e4baed3	316	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	317	return -ENFILE;
	318	}
	319
1da177e4 LT	320	memset (adap, 0, sizeof(struct dvb_adapter));
	321	INIT_LIST_HEAD (&adap->device_list);
	322
900858ec	323	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
1da177e4	324
1da177e4 LT	325	adap->num = num;
	326	adap->name = name;
	327	adap->module = module;
d09dbf92	328	adap->device = device;
1da177e4 LT	329
	330	list_add_tail (&adap->list_head, &dvb_adapter_list);
	331
1e4baed3	332	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	333
	334	return num;
	335	}
	336	EXPORT_SYMBOL(dvb_register_adapter);
	337
	338
	339	int dvb_unregister_adapter(struct dvb_adapter *adap)
	340	{
c2788502	341	mutex_lock(&dvbdev_register_lock);
1da177e4	342	list_del (&adap->list_head);
1e4baed3	343	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	344	return 0;
	345	}
	346	EXPORT_SYMBOL(dvb_unregister_adapter);
	347
	348	/* if the miracle happens and "generic_usercopy()" is included into
	349	the kernel, then this can vanish. please don't make the mistake and
	350	define this as video_usercopy(). this will introduce a dependecy
	351	to the v4l "videodev.o" module, which is unnecessary for some
	352	cards (ie. the budget dvb-cards don't need the v4l module...) */
	353	int dvb_usercopy(struct inode inode, struct file file,
afd1a0c9	354	unsigned int cmd, unsigned long arg,
1da177e4 LT	355	int (func)(struct inode inode, struct file *file,
	356	unsigned int cmd, void *arg))
	357	{
afd1a0c9 MCC	358	char sbuf[128];
	359	void *mbuf = NULL;
	360	void *parg = NULL;
	361	int err = -EINVAL;
	362
	363	/* Copy arguments into temp kernel buffer */
	364	switch (_IOC_DIR(cmd)) {
	365	case _IOC_NONE:
1da177e4 LT	366	/*
	367	* For this command, the pointer is actually an integer
	368	* argument.
	369	*/
	370	parg = (void *) arg;
	371	break;
afd1a0c9 MCC	372	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	373	case _IOC_WRITE:
	374	case (_IOC_WRITE \| _IOC_READ):
	375	if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
50c25fff	376	parg = sbuf;
afd1a0c9	377	} else {
50c25fff MK	378	/* too big to allocate from stack */
	379	mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
	380	if (NULL == mbuf)
	381	return -ENOMEM;
	382	parg = mbuf;
afd1a0c9 MCC	383	}
	384
	385	err = -EFAULT;
	386	if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
50c25fff	387	goto out;
afd1a0c9 MCC	388	break;
	389	}
	390
	391	/* call driver */
	392	if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD)
	393	err = -EINVAL;
	394
	395	if (err < 0)
	396	goto out;
	397
	398	/* Copy results into user buffer */
	399	switch (_IOC_DIR(cmd))
	400	{
	401	case _IOC_READ:
	402	case (_IOC_WRITE \| _IOC_READ):
	403	if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
50c25fff	404	err = -EFAULT;
afd1a0c9 MCC	405	break;
afd1a0c9 MCC	406	}
1da177e4 LT	407
1da177e4 LT	408	out:
afd1a0c9 MCC	409	kfree(mbuf);
afd1a0c9 MCC	410	return err;
1da177e4 LT	411	}
	412
	413	static int __init init_dvbdev(void)
	414	{
	415	int retval;
	416	dev_t dev = MKDEV(DVB_MAJOR, 0);
	417
	418	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
900858ec	419	printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
1da177e4 LT	420	return retval;
	421	}
	422
	423	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	424	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
900858ec	425	printk(KERN_ERR "dvb-core: unable register character device\n");
1da177e4 LT	426	goto error;
	427	}
	428
56b22935	429	dvb_class = class_create(THIS_MODULE, "dvb");
1da177e4 LT	430	if (IS_ERR(dvb_class)) {
	431	retval = PTR_ERR(dvb_class);
	432	goto error;
	433	}
	434	return 0;
	435
	436	error:
	437	cdev_del(&dvb_device_cdev);
	438	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	439	return retval;
	440	}
	441
	442
	443	static void __exit exit_dvbdev(void)
	444	{
56b22935	445	class_destroy(dvb_class);
1da177e4	446	cdev_del(&dvb_device_cdev);
afd1a0c9	447	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1da177e4 LT	448	}
1da177e4 LT	449
4abdcf93	450	subsys_initcall(init_dvbdev);
1da177e4 LT	451	module_exit(exit_dvbdev);
	452
	453	MODULE_DESCRIPTION("DVB Core Driver");
	454	MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
	455	MODULE_LICENSE("GPL");