[linux-2.6-block.git] / drivers / media / dvb-core / dvbdev.c

/*
 * dvbdev.c
 *
 * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
 *                  & Marcus Metzler <marcus@convergence.de>
 *                    for convergence integrated media GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/mutex.h>
#include "dvbdev.h"

static DEFINE_MUTEX(dvbdev_mutex);
static int dvbdev_debug;

module_param(dvbdev_debug, int, 0644);
MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");

#define dprintk if (dvbdev_debug) printk

static LIST_HEAD(dvb_adapter_list);
static DEFINE_MUTEX(dvbdev_register_lock);

static const char * const dnames[] = {
	"video", "audio", "sec", "frontend", "demux", "dvr", "ca",
	"net", "osd"
};

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

static struct class *dvb_class;

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

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

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

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

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


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

static struct cdev dvb_device_cdev;

int dvb_generic_open(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if (!dvbdev->users)
		return -EBUSY;

	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
		if (!dvbdev->readers)
			return -EBUSY;
		dvbdev->readers--;
	} else {
		if (!dvbdev->writers)
			return -EBUSY;
		dvbdev->writers--;
	}

	dvbdev->users--;
	return 0;
}
EXPORT_SYMBOL(dvb_generic_open);


int dvb_generic_release(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
		dvbdev->readers++;
	} else {
		dvbdev->writers++;
	}

	dvbdev->users++;
	return 0;
}
EXPORT_SYMBOL(dvb_generic_release);


long dvb_generic_ioctl(struct file *file,
		       unsigned int cmd, unsigned long arg)
{
	struct dvb_device *dvbdev = file->private_data;

	if (!dvbdev)
		return -ENODEV;

	if (!dvbdev->kernel_ioctl)
		return -EINVAL;

	return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
}
EXPORT_SYMBOL(dvb_generic_ioctl);


static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
{
	u32 id = 0;

	while (id < DVB_MAX_IDS) {
		struct dvb_device *dev;
		list_for_each_entry(dev, &adap->device_list, list_head)
			if (dev->type == type && dev->id == id)
				goto skip;
		return id;
skip:
		id++;
	}
	return -ENFILE;
}

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

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

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

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

	switch (type) {
	case DVB_DEVICE_CA:
	case DVB_DEVICE_DEMUX:
	case DVB_DEVICE_FRONTEND:
		npads = 2;
		break;
	case DVB_DEVICE_NET:
		npads = 0;
		break;
	default:
		npads = 1;
	}

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

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

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

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

int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
			const struct dvb_device *template, void *priv, int type)
{
	struct dvb_device *dvbdev;
	struct file_operations *dvbdevfops;
	struct device *clsdev;
	int minor;
	int id;

	mutex_lock(&dvbdev_register_lock);

	if ((id = dvbdev_get_free_id (adap, type)) < 0){
		mutex_unlock(&dvbdev_register_lock);
		*pdvbdev = NULL;
		printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
		return -ENFILE;
	}

	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);

	if (!dvbdev){
		mutex_unlock(&dvbdev_register_lock);
		return -ENOMEM;
	}

	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);

	if (!dvbdevfops){
		kfree (dvbdev);
		mutex_unlock(&dvbdev_register_lock);
		return -ENOMEM;
	}

	memcpy(dvbdev, template, sizeof(struct dvb_device));
	dvbdev->type = type;
	dvbdev->id = id;
	dvbdev->adapter = adap;
	dvbdev->priv = priv;
	dvbdev->fops = dvbdevfops;
	init_waitqueue_head (&dvbdev->wait_queue);

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

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

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

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

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

	mutex_unlock(&dvbdev_register_lock);

	clsdev = device_create(dvb_class, adap->device,
			       MKDEV(DVB_MAJOR, minor),
			       dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
	if (IS_ERR(clsdev)) {
		printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
		       __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
		return PTR_ERR(clsdev);
	}
	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
		adap->num, dnames[type], id, minor, minor);

	dvb_register_media_device(dvbdev, type, minor);

	return 0;
}
EXPORT_SYMBOL(dvb_register_device);


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

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

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

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

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


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

	if (!mdev)
		return;

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

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

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

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

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

static int dvbdev_check_free_adapter_num(int num)
{
	struct list_head *entry;
	list_for_each(entry, &dvb_adapter_list) {
		struct dvb_adapter *adap;
		adap = list_entry(entry, struct dvb_adapter, list_head);
		if (adap->num == num)
			return 0;
	}
	return 1;
}

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

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

	return -ENFILE;
}


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

	mutex_lock(&dvbdev_register_lock);

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

	if (num < 0) {
		mutex_unlock(&dvbdev_register_lock);
		return -ENFILE;
	}

	memset (adap, 0, sizeof(struct dvb_adapter));
	INIT_LIST_HEAD (&adap->device_list);

	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);

	adap->num = num;
	adap->name = name;
	adap->module = module;
	adap->device = device;
	adap->mfe_shared = 0;
	adap->mfe_dvbdev = NULL;
	mutex_init (&adap->mfe_lock);

	list_add_tail (&adap->list_head, &dvb_adapter_list);

	mutex_unlock(&dvbdev_register_lock);

	return num;
}
EXPORT_SYMBOL(dvb_register_adapter);


int dvb_unregister_adapter(struct dvb_adapter *adap)
{
	mutex_lock(&dvbdev_register_lock);
	list_del (&adap->list_head);
	mutex_unlock(&dvbdev_register_lock);
	return 0;
}
EXPORT_SYMBOL(dvb_unregister_adapter);

/* if the miracle happens and "generic_usercopy()" is included into
   the kernel, then this can vanish. please don't make the mistake and
   define this as video_usercopy(). this will introduce a dependecy
   to the v4l "videodev.o" module, which is unnecessary for some
   cards (ie. the budget dvb-cards don't need the v4l module...) */
int dvb_usercopy(struct file *file,
		     unsigned int cmd, unsigned long arg,
		     int (*func)(struct file *file,
		     unsigned int cmd, void *arg))
{
	char    sbuf[128];
	void    *mbuf = NULL;
	void    *parg = NULL;
	int     err  = -EINVAL;

	/*  Copy arguments into temp kernel buffer  */
	switch (_IOC_DIR(cmd)) {
	case _IOC_NONE:
		/*
		 * For this command, the pointer is actually an integer
		 * argument.
		 */
		parg = (void *) arg;
		break;
	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	case _IOC_WRITE:
	case (_IOC_WRITE | _IOC_READ):
		if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
			parg = sbuf;
		} else {
			/* too big to allocate from stack */
			mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
			if (NULL == mbuf)
				return -ENOMEM;
			parg = mbuf;
		}

		err = -EFAULT;
		if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
			goto out;
		break;
	}

	/* call driver */
	if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
		err = -ENOTTY;

	if (err < 0)
		goto out;

	/*  Copy results into user buffer  */
	switch (_IOC_DIR(cmd))
	{
	case _IOC_READ:
	case (_IOC_WRITE | _IOC_READ):
		if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
			err = -EFAULT;
		break;
	}

out:
	kfree(mbuf);
	return err;
}

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

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

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

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


static int __init init_dvbdev(void)
{
	int retval;
	dev_t dev = MKDEV(DVB_MAJOR, 0);

	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
		printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
		return retval;
	}

	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
		printk(KERN_ERR "dvb-core: unable register character device\n");
		goto error;
	}

	dvb_class = class_create(THIS_MODULE, "dvb");
	if (IS_ERR(dvb_class)) {
		retval = PTR_ERR(dvb_class);
		goto error;
	}
	dvb_class->dev_uevent = dvb_uevent;
	dvb_class->devnode = dvb_devnode;
	return 0;

error:
	cdev_del(&dvb_device_cdev);
	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	return retval;
}


static void __exit exit_dvbdev(void)
{
	class_destroy(dvb_class);
	cdev_del(&dvb_device_cdev);
	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
}

subsys_initcall(init_dvbdev);
module_exit(exit_dvbdev);

MODULE_DESCRIPTION("DVB Core Driver");
MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* dvbdev.c
	3	*
	4	* Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>
	5	* & Marcus Metzler <marcus@convergence.de>
	6	* for convergence integrated media GmbH
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public License
	10	* as published by the Free Software Foundation; either version 2.1
	11	* of the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	21	*
	22	*/
	23
	24	#include <linux/types.h>
	25	#include <linux/errno.h>
	26	#include <linux/string.h>
	27	#include <linux/module.h>
1da177e4	28	#include <linux/kernel.h>
1da177e4 LT	29	#include <linux/init.h>
	30	#include <linux/slab.h>
	31	#include <linux/device.h>
	32	#include <linux/fs.h>
	33	#include <linux/cdev.h>
1e4baed3	34	#include <linux/mutex.h>
1da177e4 LT	35	#include "dvbdev.h"
1da177e4 LT	36
72024f1e	37	static DEFINE_MUTEX(dvbdev_mutex);
1da177e4 LT	38	static int dvbdev_debug;
	39
	40	module_param(dvbdev_debug, int, 0644);
	41	MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
	42
	43	#define dprintk if (dvbdev_debug) printk
	44
	45	static LIST_HEAD(dvb_adapter_list);
1e4baed3	46	static DEFINE_MUTEX(dvbdev_register_lock);
1da177e4 LT	47
1da177e4 LT	48	static const char * const dnames[] = {
afd1a0c9	49	"video", "audio", "sec", "frontend", "demux", "dvr", "ca",
1da177e4 LT	50	"net", "osd"
	51	};
	52
5dd3f307 AO	53	#ifdef CONFIG_DVB_DYNAMIC_MINORS
	54	#define MAX_DVB_MINORS 256
	55	#define DVB_MAX_IDS MAX_DVB_MINORS
	56	#else
1da177e4 LT	57	#define DVB_MAX_IDS 4
	58	#define nums2minor(num,type,id) ((num << 6) \| (id << 4) \| type)
	59	#define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
5dd3f307	60	#endif
1da177e4	61
56b22935	62	static struct class *dvb_class;
1da177e4	63
5dd3f307 AO	64	static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
5dd3f307 AO	65	static DECLARE_RWSEM(minor_rwsem);
1da177e4 LT	66
	67	static int dvb_device_open(struct inode inode, struct file file)
	68	{
	69	struct dvb_device *dvbdev;
	70
72024f1e	71	mutex_lock(&dvbdev_mutex);
5dd3f307 AO	72	down_read(&minor_rwsem);
5dd3f307 AO	73	dvbdev = dvb_minors[iminor(inode)];
1da177e4 LT	74
	75	if (dvbdev && dvbdev->fops) {
	76	int err = 0;
e84f9e57	77	const struct file_operations *new_fops;
1da177e4	78
e84f9e57 AV	79	new_fops = fops_get(dvbdev->fops);
e84f9e57 AV	80	if (!new_fops)
f41ced8f	81	goto fail;
e84f9e57 AV	82	file->private_data = dvbdev;
	83	replace_fops(file, new_fops);
	84	if (file->f_op->open)
50c25fff	85	err = file->f_op->open(inode,file);
5dd3f307	86	up_read(&minor_rwsem);
72024f1e	87	mutex_unlock(&dvbdev_mutex);
afd1a0c9	88	return err;
1da177e4	89	}
f41ced8f	90	fail:
5dd3f307	91	up_read(&minor_rwsem);
72024f1e	92	mutex_unlock(&dvbdev_mutex);
1da177e4 LT	93	return -ENODEV;
	94	}
	95
	96
27a643b1	97	static const struct file_operations dvb_device_fops =
1da177e4 LT	98	{
	99	.owner = THIS_MODULE,
	100	.open = dvb_device_open,
6038f373	101	.llseek = noop_llseek,
1da177e4 LT	102	};
1da177e4 LT	103
7e7654a9	104	static struct cdev dvb_device_cdev;
1da177e4 LT	105
	106	int dvb_generic_open(struct inode inode, struct file file)
	107	{
afd1a0c9	108	struct dvb_device *dvbdev = file->private_data;
1da177e4	109
afd1a0c9 MCC	110	if (!dvbdev)
afd1a0c9 MCC	111	return -ENODEV;
1da177e4 LT	112
1da177e4 LT	113	if (!dvbdev->users)
afd1a0c9	114	return -EBUSY;
1da177e4 LT	115
1da177e4 LT	116	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
afd1a0c9 MCC	117	if (!dvbdev->readers)
afd1a0c9 MCC	118	return -EBUSY;
1da177e4 LT	119	dvbdev->readers--;
1da177e4 LT	120	} else {
afd1a0c9 MCC	121	if (!dvbdev->writers)
afd1a0c9 MCC	122	return -EBUSY;
1da177e4 LT	123	dvbdev->writers--;
	124	}
	125
	126	dvbdev->users--;
	127	return 0;
	128	}
	129	EXPORT_SYMBOL(dvb_generic_open);
	130
	131
	132	int dvb_generic_release(struct inode inode, struct file file)
	133	{
afd1a0c9	134	struct dvb_device *dvbdev = file->private_data;
1da177e4 LT	135
1da177e4 LT	136	if (!dvbdev)
afd1a0c9	137	return -ENODEV;
1da177e4 LT	138
	139	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
	140	dvbdev->readers++;
	141	} else {
	142	dvbdev->writers++;
	143	}
	144
	145	dvbdev->users++;
	146	return 0;
	147	}
	148	EXPORT_SYMBOL(dvb_generic_release);
	149
	150
16ef8def AB	151	long dvb_generic_ioctl(struct file *file,
16ef8def AB	152	unsigned int cmd, unsigned long arg)
1da177e4	153	{
afd1a0c9	154	struct dvb_device *dvbdev = file->private_data;
1da177e4	155
afd1a0c9 MCC	156	if (!dvbdev)
afd1a0c9 MCC	157	return -ENODEV;
1da177e4 LT	158
	159	if (!dvbdev->kernel_ioctl)
	160	return -EINVAL;
	161
72024f1e	162	return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
1da177e4 LT	163	}
	164	EXPORT_SYMBOL(dvb_generic_ioctl);
	165
	166
	167	static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
	168	{
	169	u32 id = 0;
	170
	171	while (id < DVB_MAX_IDS) {
79482619 TP	172	struct dvb_device *dev;
79482619 TP	173	list_for_each_entry(dev, &adap->device_list, list_head)
1da177e4 LT	174	if (dev->type == type && dev->id == id)
1da177e4 LT	175	goto skip;
1da177e4 LT	176	return id;
	177	skip:
	178	id++;
	179	}
	180	return -ENFILE;
	181	}
	182
a0246e02 MCC	183	static void dvb_register_media_device(struct dvb_device *dvbdev,
	184	int type, int minor)
	185	{
	186	#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
172e9d3c	187	int ret = 0, npads;
a0246e02 MCC	188
	189	if (!dvbdev->adapter->mdev)
	190	return;
	191
	192	dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
	193	if (!dvbdev->entity)
	194	return;
	195
	196	dvbdev->entity->info.dev.major = DVB_MAJOR;
	197	dvbdev->entity->info.dev.minor = minor;
	198	dvbdev->entity->name = dvbdev->name;
172e9d3c MCC	199
	200	switch (type) {
	201	case DVB_DEVICE_CA:
	202	case DVB_DEVICE_DEMUX:
3bde1b78	203	case DVB_DEVICE_FRONTEND:
172e9d3c MCC	204	npads = 2;
	205	break;
	206	case DVB_DEVICE_NET:
	207	npads = 0;
	208	break;
	209	default:
	210	npads = 1;
	211	}
	212
	213	if (npads) {
	214	dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
	215	GFP_KERNEL);
	216	if (!dvbdev->pads) {
	217	kfree(dvbdev->entity);
	218	return;
	219	}
	220	}
	221
a0246e02 MCC	222	switch (type) {
	223	case DVB_DEVICE_FRONTEND:
	224	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_FE;
3bde1b78 MCC	225	dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
3bde1b78 MCC	226	dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
a0246e02 MCC	227	break;
	228	case DVB_DEVICE_DEMUX:
	229	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DEMUX;
3bde1b78 MCC	230	dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
3bde1b78 MCC	231	dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
a0246e02 MCC	232	break;
	233	case DVB_DEVICE_DVR:
	234	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DVR;
172e9d3c	235	dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
a0246e02 MCC	236	break;
	237	case DVB_DEVICE_CA:
	238	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_CA;
3bde1b78 MCC	239	dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
3bde1b78 MCC	240	dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
a0246e02 MCC	241	break;
	242	case DVB_DEVICE_NET:
	243	dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_NET;
	244	break;
	245	default:
	246	kfree(dvbdev->entity);
	247	dvbdev->entity = NULL;
	248	return;
	249	}
	250
172e9d3c MCC	251	if (npads)
	252	ret = media_entity_init(dvbdev->entity, npads, dvbdev->pads, 0);
	253	if (!ret)
	254	ret = media_device_register_entity(dvbdev->adapter->mdev,
	255	dvbdev->entity);
a0246e02 MCC	256	if (ret < 0) {
	257	printk(KERN_ERR
	258	"%s: media_device_register_entity failed for %s\n",
	259	__func__, dvbdev->entity->name);
172e9d3c	260	kfree(dvbdev->pads);
a0246e02 MCC	261	kfree(dvbdev->entity);
	262	dvbdev->entity = NULL;
	263	return;
	264	}
	265
	266	printk(KERN_DEBUG "%s: media device '%s' registered.\n",
	267	__func__, dvbdev->entity->name);
	268	#endif
	269	}
1da177e4 LT	270
	271	int dvb_register_device(struct dvb_adapter adap, struct dvb_device *pdvbdev,
	272	const struct dvb_device template, void priv, int type)
	273	{
	274	struct dvb_device *dvbdev;
b6190102	275	struct file_operations *dvbdevfops;
5f553388	276	struct device *clsdev;
5dd3f307	277	int minor;
1da177e4 LT	278	int id;
1da177e4 LT	279
c2788502	280	mutex_lock(&dvbdev_register_lock);
1da177e4	281
b6190102	282	if ((id = dvbdev_get_free_id (adap, type)) < 0){
1e4baed3	283	mutex_unlock(&dvbdev_register_lock);
1da177e4	284	*pdvbdev = NULL;
46b4f7c1	285	printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
1da177e4 LT	286	return -ENFILE;
	287	}
	288
	289	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
	290
b6190102 MS	291	if (!dvbdev){
	292	mutex_unlock(&dvbdev_register_lock);
	293	return -ENOMEM;
	294	}
	295
	296	dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
	297
	298	if (!dvbdevfops){
	299	kfree (dvbdev);
1e4baed3	300	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	301	return -ENOMEM;
	302	}
	303
1da177e4 LT	304	memcpy(dvbdev, template, sizeof(struct dvb_device));
	305	dvbdev->type = type;
	306	dvbdev->id = id;
	307	dvbdev->adapter = adap;
	308	dvbdev->priv = priv;
b6190102	309	dvbdev->fops = dvbdevfops;
ca5be9cd	310	init_waitqueue_head (&dvbdev->wait_queue);
1da177e4	311
784e29d2 JE	312	memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
784e29d2 JE	313	dvbdevfops->owner = adap->module;
1da177e4 LT	314
	315	list_add_tail (&dvbdev->list_head, &adap->device_list);
	316
5dd3f307 AO	317	down_write(&minor_rwsem);
	318	#ifdef CONFIG_DVB_DYNAMIC_MINORS
	319	for (minor = 0; minor < MAX_DVB_MINORS; minor++)
	320	if (dvb_minors[minor] == NULL)
	321	break;
	322
	323	if (minor == MAX_DVB_MINORS) {
	324	kfree(dvbdevfops);
	325	kfree(dvbdev);
82163edc	326	up_write(&minor_rwsem);
5dd3f307 AO	327	mutex_unlock(&dvbdev_register_lock);
	328	return -EINVAL;
	329	}
	330	#else
	331	minor = nums2minor(adap->num, type, id);
	332	#endif
	333
	334	dvbdev->minor = minor;
	335	dvb_minors[minor] = dvbdev;
	336	up_write(&minor_rwsem);
	337
f47f4763 AQ	338	mutex_unlock(&dvbdev_register_lock);
f47f4763 AQ	339
a9b12619	340	clsdev = device_create(dvb_class, adap->device,
b7496780	341	MKDEV(DVB_MAJOR, minor),
a5f4c0ce	342	dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
4abdcf93 SA	343	if (IS_ERR(clsdev)) {
4abdcf93 SA	344	printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
46b4f7c1	345	__func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
4abdcf93 SA	346	return PTR_ERR(clsdev);
4abdcf93 SA	347	}
900858ec	348	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
5dd3f307	349	adap->num, dnames[type], id, minor, minor);
1da177e4	350
a0246e02 MCC	351	dvb_register_media_device(dvbdev, type, minor);
a0246e02 MCC	352
1da177e4 LT	353	return 0;
	354	}
	355	EXPORT_SYMBOL(dvb_register_device);
	356
	357
	358	void dvb_unregister_device(struct dvb_device *dvbdev)
	359	{
	360	if (!dvbdev)
	361	return;
	362
5dd3f307 AO	363	down_write(&minor_rwsem);
	364	dvb_minors[dvbdev->minor] = NULL;
	365	up_write(&minor_rwsem);
	366
	367	device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
1da177e4	368
a0246e02 MCC	369	#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
	370	if (dvbdev->entity) {
	371	media_device_unregister_entity(dvbdev->entity);
	372	kfree(dvbdev->entity);
172e9d3c	373	kfree(dvbdev->pads);
a0246e02 MCC	374	}
	375	#endif
	376
1da177e4	377	list_del (&dvbdev->list_head);
b6190102	378	kfree (dvbdev->fops);
1da177e4 LT	379	kfree (dvbdev);
	380	}
	381	EXPORT_SYMBOL(dvb_unregister_device);
	382
4155109a	383
4155109a	384	#ifdef CONFIG_MEDIA_CONTROLLER_DVB
480884b6 MCC	385	void dvb_create_media_graph(struct dvb_adapter *adap)
	386	{
	387	struct media_device *mdev = adap->mdev;
4155109a MCC	388	struct media_entity entity, tuner = NULL, *fe = NULL;
	389	struct media_entity demux = NULL, dvr = NULL, *ca = NULL;
	390
	391	if (!mdev)
	392	return;
	393
	394	media_device_for_each_entity(entity, mdev) {
	395	switch (entity->type) {
	396	case MEDIA_ENT_T_V4L2_SUBDEV_TUNER:
	397	tuner = entity;
	398	break;
	399	case MEDIA_ENT_T_DEVNODE_DVB_FE:
	400	fe = entity;
	401	break;
	402	case MEDIA_ENT_T_DEVNODE_DVB_DEMUX:
	403	demux = entity;
	404	break;
	405	case MEDIA_ENT_T_DEVNODE_DVB_DVR:
	406	dvr = entity;
	407	break;
	408	case MEDIA_ENT_T_DEVNODE_DVB_CA:
	409	ca = entity;
	410	break;
	411	}
	412	}
	413
	414	if (tuner && fe)
	415	media_entity_create_link(tuner, 0, fe, 0, 0);
	416
	417	if (fe && demux)
6bb0b182	418	media_entity_create_link(fe, 1, demux, 0, MEDIA_LNK_FL_ENABLED);
4155109a MCC	419
4155109a MCC	420	if (demux && dvr)
6bb0b182	421	media_entity_create_link(demux, 1, dvr, 0, MEDIA_LNK_FL_ENABLED);
4155109a MCC	422
4155109a MCC	423	if (demux && ca)
6bb0b182	424	media_entity_create_link(demux, 1, ca, 0, MEDIA_LNK_FL_ENABLED);
4155109a MCC	425	}
4155109a MCC	426	EXPORT_SYMBOL_GPL(dvb_create_media_graph);
480884b6	427	#endif
4155109a	428
78e92006 JG	429	static int dvbdev_check_free_adapter_num(int num)
	430	{
	431	struct list_head *entry;
	432	list_for_each(entry, &dvb_adapter_list) {
	433	struct dvb_adapter *adap;
	434	adap = list_entry(entry, struct dvb_adapter, list_head);
	435	if (adap->num == num)
	436	return 0;
	437	}
	438	return 1;
	439	}
1da177e4 LT	440
	441	static int dvbdev_get_free_adapter_num (void)
	442	{
	443	int num = 0;
	444
	445	while (num < DVB_MAX_ADAPTERS) {
78e92006 JG	446	if (dvbdev_check_free_adapter_num(num))
78e92006 JG	447	return num;
1da177e4 LT	448	num++;
	449	}
	450
	451	return -ENFILE;
	452	}
	453
	454
78e92006 JG	455	int dvb_register_adapter(struct dvb_adapter adap, const char name,
	456	struct module module, struct device device,
	457	short *adapter_nums)
1da177e4	458	{
78e92006	459	int i, num;
1da177e4	460
c2788502	461	mutex_lock(&dvbdev_register_lock);
1da177e4	462
78e92006 JG	463	for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
	464	num = adapter_nums[i];
	465	if (num >= 0 && num < DVB_MAX_ADAPTERS) {
	466	/* use the one the driver asked for */
	467	if (dvbdev_check_free_adapter_num(num))
	468	break;
	469	} else {
	470	num = dvbdev_get_free_adapter_num();
	471	break;
	472	}
	473	num = -1;
	474	}
	475
	476	if (num < 0) {
1e4baed3	477	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	478	return -ENFILE;
	479	}
	480
1da177e4 LT	481	memset (adap, 0, sizeof(struct dvb_adapter));
	482	INIT_LIST_HEAD (&adap->device_list);
	483
900858ec	484	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
1da177e4	485
1da177e4 LT	486	adap->num = num;
	487	adap->name = name;
	488	adap->module = module;
d09dbf92	489	adap->device = device;
59b1842d DB	490	adap->mfe_shared = 0;
	491	adap->mfe_dvbdev = NULL;
	492	mutex_init (&adap->mfe_lock);
1da177e4 LT	493
	494	list_add_tail (&adap->list_head, &dvb_adapter_list);
	495
1e4baed3	496	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	497
	498	return num;
	499	}
	500	EXPORT_SYMBOL(dvb_register_adapter);
	501
	502
	503	int dvb_unregister_adapter(struct dvb_adapter *adap)
	504	{
c2788502	505	mutex_lock(&dvbdev_register_lock);
1da177e4	506	list_del (&adap->list_head);
1e4baed3	507	mutex_unlock(&dvbdev_register_lock);
1da177e4 LT	508	return 0;
	509	}
	510	EXPORT_SYMBOL(dvb_unregister_adapter);
	511
	512	/* if the miracle happens and "generic_usercopy()" is included into
	513	the kernel, then this can vanish. please don't make the mistake and
	514	define this as video_usercopy(). this will introduce a dependecy
	515	to the v4l "videodev.o" module, which is unnecessary for some
	516	cards (ie. the budget dvb-cards don't need the v4l module...) */
16ef8def	517	int dvb_usercopy(struct file *file,
afd1a0c9	518	unsigned int cmd, unsigned long arg,
16ef8def	519	int (func)(struct file file,
1da177e4 LT	520	unsigned int cmd, void *arg))
1da177e4 LT	521	{
afd1a0c9 MCC	522	char sbuf[128];
	523	void *mbuf = NULL;
	524	void *parg = NULL;
	525	int err = -EINVAL;
	526
	527	/* Copy arguments into temp kernel buffer */
	528	switch (_IOC_DIR(cmd)) {
	529	case _IOC_NONE:
1da177e4 LT	530	/*
	531	* For this command, the pointer is actually an integer
	532	* argument.
	533	*/
	534	parg = (void *) arg;
	535	break;
afd1a0c9 MCC	536	case _IOC_READ: /* some v4l ioctls are marked wrong ... */
	537	case _IOC_WRITE:
	538	case (_IOC_WRITE \| _IOC_READ):
	539	if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
50c25fff	540	parg = sbuf;
afd1a0c9	541	} else {
50c25fff MK	542	/* too big to allocate from stack */
	543	mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
	544	if (NULL == mbuf)
	545	return -ENOMEM;
	546	parg = mbuf;
afd1a0c9 MCC	547	}
	548
	549	err = -EFAULT;
	550	if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
50c25fff	551	goto out;
afd1a0c9 MCC	552	break;
	553	}
	554
	555	/* call driver */
16ef8def	556	if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
d9751fd0	557	err = -ENOTTY;
afd1a0c9 MCC	558
	559	if (err < 0)
	560	goto out;
	561
	562	/* Copy results into user buffer */
	563	switch (_IOC_DIR(cmd))
	564	{
	565	case _IOC_READ:
	566	case (_IOC_WRITE \| _IOC_READ):
	567	if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
50c25fff	568	err = -EFAULT;
afd1a0c9 MCC	569	break;
afd1a0c9 MCC	570	}
1da177e4 LT	571
1da177e4 LT	572	out:
afd1a0c9 MCC	573	kfree(mbuf);
afd1a0c9 MCC	574	return err;
1da177e4 LT	575	}
1da177e4 LT	576
a5f4c0ce KS	577	static int dvb_uevent(struct device dev, struct kobj_uevent_env env)
	578	{
	579	struct dvb_device *dvbdev = dev_get_drvdata(dev);
	580
a5f4c0ce	581	add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
763d19bb KS	582	add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
763d19bb KS	583	add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
a5f4c0ce KS	584	return 0;
	585	}
	586
2c9ede55	587	static char dvb_devnode(struct device dev, umode_t *mode)
8a8bdcc7 KS	588	{
	589	struct dvb_device *dvbdev = dev_get_drvdata(dev);
	590
	591	return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
	592	dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
	593	}
	594
	595
1da177e4 LT	596	static int __init init_dvbdev(void)
	597	{
	598	int retval;
	599	dev_t dev = MKDEV(DVB_MAJOR, 0);
	600
	601	if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
900858ec	602	printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
1da177e4 LT	603	return retval;
	604	}
	605
	606	cdev_init(&dvb_device_cdev, &dvb_device_fops);
	607	if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
900858ec	608	printk(KERN_ERR "dvb-core: unable register character device\n");
1da177e4 LT	609	goto error;
	610	}
	611
56b22935	612	dvb_class = class_create(THIS_MODULE, "dvb");
1da177e4 LT	613	if (IS_ERR(dvb_class)) {
	614	retval = PTR_ERR(dvb_class);
	615	goto error;
	616	}
a5f4c0ce	617	dvb_class->dev_uevent = dvb_uevent;
e454cea2	618	dvb_class->devnode = dvb_devnode;
1da177e4 LT	619	return 0;
	620
	621	error:
	622	cdev_del(&dvb_device_cdev);
	623	unregister_chrdev_region(dev, MAX_DVB_MINORS);
	624	return retval;
	625	}
	626
	627
	628	static void __exit exit_dvbdev(void)
	629	{
56b22935	630	class_destroy(dvb_class);
1da177e4	631	cdev_del(&dvb_device_cdev);
afd1a0c9	632	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1da177e4 LT	633	}
1da177e4 LT	634
4abdcf93	635	subsys_initcall(init_dvbdev);
1da177e4 LT	636	module_exit(exit_dvbdev);
	637
	638	MODULE_DESCRIPTION("DVB Core Driver");
	639	MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
	640	MODULE_LICENSE("GPL");