[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"
};

#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;

	lock_kernel();
	down_read(&minor_rwsem);
	dvbdev = dvb_minors[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);
		up_read(&minor_rwsem);
		unlock_kernel();
		return err;
	}
	up_read(&minor_rwsem);
	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 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(dvbdev->fops, template->fops, sizeof(struct file_operations));
	dvbdev->fops->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);
		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, 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, minor, 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));

	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;
	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 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
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
5794e1b1	71	lock_kernel();
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;
99ac48f5	77	const struct file_operations *old_fops;
1da177e4 LT	78
	79	file->private_data = dvbdev;
	80	old_fops = file->f_op;
afd1a0c9 MCC	81	file->f_op = fops_get(dvbdev->fops);
afd1a0c9 MCC	82	if(file->f_op->open)
50c25fff	83	err = file->f_op->open(inode,file);
afd1a0c9	84	if (err) {
50c25fff MK	85	fops_put(file->f_op);
50c25fff MK	86	file->f_op = fops_get(old_fops);
afd1a0c9 MCC	87	}
afd1a0c9 MCC	88	fops_put(old_fops);
5dd3f307	89	up_read(&minor_rwsem);
5794e1b1	90	unlock_kernel();
afd1a0c9	91	return err;
1da177e4	92	}
5dd3f307	93	up_read(&minor_rwsem);
5794e1b1	94	unlock_kernel();
1da177e4 LT	95	return -ENODEV;
	96	}
	97
	98
27a643b1	99	static const struct file_operations dvb_device_fops =
1da177e4 LT	100	{
	101	.owner = THIS_MODULE,
	102	.open = dvb_device_open,
	103	};
	104
7e7654a9	105	static struct cdev dvb_device_cdev;
1da177e4 LT	106
	107	int dvb_generic_open(struct inode inode, struct file file)
	108	{
afd1a0c9	109	struct dvb_device *dvbdev = file->private_data;
1da177e4	110
afd1a0c9 MCC	111	if (!dvbdev)
afd1a0c9 MCC	112	return -ENODEV;
1da177e4 LT	113
1da177e4 LT	114	if (!dvbdev->users)
afd1a0c9	115	return -EBUSY;
1da177e4 LT	116
1da177e4 LT	117	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
afd1a0c9 MCC	118	if (!dvbdev->readers)
afd1a0c9 MCC	119	return -EBUSY;
1da177e4 LT	120	dvbdev->readers--;
1da177e4 LT	121	} else {
afd1a0c9 MCC	122	if (!dvbdev->writers)
afd1a0c9 MCC	123	return -EBUSY;
1da177e4 LT	124	dvbdev->writers--;
	125	}
	126
	127	dvbdev->users--;
	128	return 0;
	129	}
	130	EXPORT_SYMBOL(dvb_generic_open);
	131
	132
	133	int dvb_generic_release(struct inode inode, struct file file)
	134	{
afd1a0c9	135	struct dvb_device *dvbdev = file->private_data;
1da177e4 LT	136
1da177e4 LT	137	if (!dvbdev)
afd1a0c9	138	return -ENODEV;
1da177e4 LT	139
	140	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
	141	dvbdev->readers++;
	142	} else {
	143	dvbdev->writers++;
	144	}
	145
	146	dvbdev->users++;
	147	return 0;
	148	}
	149	EXPORT_SYMBOL(dvb_generic_release);
	150
	151
	152	int dvb_generic_ioctl(struct inode inode, struct file file,
	153	unsigned int cmd, unsigned long arg)
	154	{
afd1a0c9	155	struct dvb_device *dvbdev = file->private_data;
1da177e4	156
afd1a0c9 MCC	157	if (!dvbdev)
afd1a0c9 MCC	158	return -ENODEV;
1da177e4 LT	159
	160	if (!dvbdev->kernel_ioctl)
	161	return -EINVAL;
	162
	163	return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl);
	164	}
	165	EXPORT_SYMBOL(dvb_generic_ioctl);
	166
	167
	168	static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
	169	{
	170	u32 id = 0;
	171
	172	while (id < DVB_MAX_IDS) {
79482619 TP	173	struct dvb_device *dev;
79482619 TP	174	list_for_each_entry(dev, &adap->device_list, list_head)
1da177e4 LT	175	if (dev->type == type && dev->id == id)
1da177e4 LT	176	goto skip;
1da177e4 LT	177	return id;
	178	skip:
	179	id++;
	180	}
	181	return -ENFILE;
	182	}
	183
	184
	185	int dvb_register_device(struct dvb_adapter adap, struct dvb_device *pdvbdev,
	186	const struct dvb_device template, void priv, int type)
	187	{
	188	struct dvb_device *dvbdev;
b6190102	189	struct file_operations *dvbdevfops;
5f553388	190	struct device *clsdev;
5dd3f307	191	int minor;
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;
46b4f7c1	199	printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
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
5dd3f307 AO	231	down_write(&minor_rwsem);
	232	#ifdef CONFIG_DVB_DYNAMIC_MINORS
	233	for (minor = 0; minor < MAX_DVB_MINORS; minor++)
	234	if (dvb_minors[minor] == NULL)
	235	break;
	236
	237	if (minor == MAX_DVB_MINORS) {
	238	kfree(dvbdevfops);
	239	kfree(dvbdev);
	240	mutex_unlock(&dvbdev_register_lock);
	241	return -EINVAL;
	242	}
	243	#else
	244	minor = nums2minor(adap->num, type, id);
	245	#endif
	246
	247	dvbdev->minor = minor;
	248	dvb_minors[minor] = dvbdev;
	249	up_write(&minor_rwsem);
	250
f47f4763 AQ	251	mutex_unlock(&dvbdev_register_lock);
f47f4763 AQ	252
a9b12619	253	clsdev = device_create(dvb_class, adap->device,
5f553388	254	MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
e282959e	255	NULL, "dvb%d.%s%d", adap->num, dnames[type], id);
4abdcf93 SA	256	if (IS_ERR(clsdev)) {
4abdcf93 SA	257	printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
46b4f7c1	258	__func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
4abdcf93 SA	259	return PTR_ERR(clsdev);
4abdcf93 SA	260	}
1da177e4	261
900858ec	262	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
5dd3f307	263	adap->num, dnames[type], id, minor, minor);
1da177e4 LT	264
	265	return 0;
	266	}
	267	EXPORT_SYMBOL(dvb_register_device);
	268
	269
	270	void dvb_unregister_device(struct dvb_device *dvbdev)
	271	{
	272	if (!dvbdev)
	273	return;
	274
5dd3f307 AO	275	down_write(&minor_rwsem);
	276	dvb_minors[dvbdev->minor] = NULL;
	277	up_write(&minor_rwsem);
	278
	279	device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
1da177e4 LT	280
1da177e4 LT	281	list_del (&dvbdev->list_head);
b6190102	282	kfree (dvbdev->fops);
1da177e4 LT	283	kfree (dvbdev);
	284	}
	285	EXPORT_SYMBOL(dvb_unregister_device);
	286
78e92006 JG	287	static int dvbdev_check_free_adapter_num(int num)
	288	{
	289	struct list_head *entry;
	290	list_for_each(entry, &dvb_adapter_list) {
	291	struct dvb_adapter *adap;
	292	adap = list_entry(entry, struct dvb_adapter, list_head);
	293	if (adap->num == num)
	294	return 0;
	295	}
	296	return 1;
	297	}
1da177e4 LT	298
	299	static int dvbdev_get_free_adapter_num (void)
	300	{
	301	int num = 0;
	302
	303	while (num < DVB_MAX_ADAPTERS) {
78e92006 JG	304	if (dvbdev_check_free_adapter_num(num))
78e92006 JG	305	return num;
1da177e4 LT	306	num++;
	307	}
	308
	309	return -ENFILE;
	310	}
	311
	312
78e92006 JG	313	int dvb_register_adapter(struct dvb_adapter adap, const char name,
	314	struct module module, struct device device,
	315	short *adapter_nums)
1da177e4	316	{
78e92006	317	int i, num;
1da177e4	318
c2788502	319	mutex_lock(&dvbdev_register_lock);
1da177e4	320
78e92006 JG	321	for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
	322	num = adapter_nums[i];
	323	if (num >= 0 && num < DVB_MAX_ADAPTERS) {
	324	/* use the one the driver asked for */
	325	if (dvbdev_check_free_adapter_num(num))
	326	break;
	327	} else {
	328	num = dvbdev_get_free_adapter_num();
	329	break;
	330	}
	331	num = -1;
	332	}
	333
	334	if (num < 0) {
1e4baed3	335	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	336	return -ENFILE;
	337	}
	338
1da177e4 LT	339	memset (adap, 0, sizeof(struct dvb_adapter));
	340	INIT_LIST_HEAD (&adap->device_list);
	341
900858ec	342	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
1da177e4	343
1da177e4 LT	344	adap->num = num;
	345	adap->name = name;
	346	adap->module = module;
d09dbf92	347	adap->device = device;
59b1842d DB	348	adap->mfe_shared = 0;
	349	adap->mfe_dvbdev = NULL;
	350	mutex_init (&adap->mfe_lock);
1da177e4 LT	351
	352	list_add_tail (&adap->list_head, &dvb_adapter_list);
	353
1e4baed3	354	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	355
	356	return num;
	357	}
	358	EXPORT_SYMBOL(dvb_register_adapter);
	359
	360
	361	int dvb_unregister_adapter(struct dvb_adapter *adap)
	362	{
c2788502	363	mutex_lock(&dvbdev_register_lock);
1da177e4	364	list_del (&adap->list_head);
1e4baed3	365	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	366	return 0;
	367	}
	368	EXPORT_SYMBOL(dvb_unregister_adapter);
	369
	370	/* if the miracle happens and "generic_usercopy()" is included into
	371	the kernel, then this can vanish. please don't make the mistake and
	372	define this as video_usercopy(). this will introduce a dependecy
	373	to the v4l "videodev.o" module, which is unnecessary for some
	374	cards (ie. the budget dvb-cards don't need the v4l module...) */
	375	int dvb_usercopy(struct inode inode, struct file file,
afd1a0c9	376	unsigned int cmd, unsigned long arg,
1da177e4 LT	377	int (func)(struct inode inode, struct file *file,
	378	unsigned int cmd, void *arg))
	379	{
afd1a0c9 MCC	380	char sbuf[128];
	381	void *mbuf = NULL;
	382	void *parg = NULL;
	383	int err = -EINVAL;
	384
	385	/* Copy arguments into temp kernel buffer */
	386	switch (_IOC_DIR(cmd)) {
	387	case _IOC_NONE:
1da177e4 LT	388	/*
	389	* For this command, the pointer is actually an integer
	390	* argument.
	391	*/
	392	parg = (void *) arg;
	393	break;
afd1a0c9 MCC	394	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	395	case _IOC_WRITE:
	396	case (_IOC_WRITE \| _IOC_READ):
	397	if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
50c25fff	398	parg = sbuf;
afd1a0c9	399	} else {
50c25fff MK	400	/* too big to allocate from stack */
	401	mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
	402	if (NULL == mbuf)
	403	return -ENOMEM;
	404	parg = mbuf;
afd1a0c9 MCC	405	}
	406
	407	err = -EFAULT;
	408	if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
50c25fff	409	goto out;
afd1a0c9 MCC	410	break;
	411	}
	412
	413	/* call driver */
	414	if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD)
	415	err = -EINVAL;
	416
	417	if (err < 0)
	418	goto out;
	419
	420	/* Copy results into user buffer */
	421	switch (_IOC_DIR(cmd))
	422	{
	423	case _IOC_READ:
	424	case (_IOC_WRITE \| _IOC_READ):
	425	if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
50c25fff	426	err = -EFAULT;
afd1a0c9 MCC	427	break;
afd1a0c9 MCC	428	}
1da177e4 LT	429
1da177e4 LT	430	out:
afd1a0c9 MCC	431	kfree(mbuf);
afd1a0c9 MCC	432	return err;
1da177e4 LT	433	}
	434
	435	static int __init init_dvbdev(void)
	436	{
	437	int retval;
	438	dev_t dev = MKDEV(DVB_MAJOR, 0);
	439
	440	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
900858ec	441	printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
1da177e4 LT	442	return retval;
	443	}
	444
	445	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	446	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
900858ec	447	printk(KERN_ERR "dvb-core: unable register character device\n");
1da177e4 LT	448	goto error;
	449	}
	450
56b22935	451	dvb_class = class_create(THIS_MODULE, "dvb");
1da177e4 LT	452	if (IS_ERR(dvb_class)) {
	453	retval = PTR_ERR(dvb_class);
	454	goto error;
	455	}
	456	return 0;
	457
	458	error:
	459	cdev_del(&dvb_device_cdev);
	460	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	461	return retval;
	462	}
	463
	464
	465	static void __exit exit_dvbdev(void)
	466	{
56b22935	467	class_destroy(dvb_class);
1da177e4	468	cdev_del(&dvb_device_cdev);
afd1a0c9	469	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1da177e4 LT	470	}
1da177e4 LT	471
4abdcf93	472	subsys_initcall(init_dvbdev);
1da177e4 LT	473	module_exit(exit_dvbdev);
	474
	475	MODULE_DESCRIPTION("DVB Core Driver");
	476	MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
	477	MODULE_LICENSE("GPL");