[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 "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 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;

	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;

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