/*  * 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/sched.h>#include <linux/init.h>#include <linux/slab.h>#include "dvbdev.h"#include "dvb_functions.h"static int dvbdev_debug = 0;#define dprintk if (dvbdev_debug) printkstatic LIST_HEAD(dvb_adapter_list);static DECLARE_MUTEX(dvbdev_register_lock);static char *dnames[] = {         "video", "audio", "sec", "frontend", "demux", "dvr", "ca",	"net", "osd"};#ifdef CONFIG_DVB_DEVFS_ONLY	#define DVB_MAX_IDS              ~0	#define nums2minor(num,type,id)  0#else	#define DVB_MAX_IDS              4	#define nums2minor(num,type,id)  ((num << 6) | (id << 4) | type)static struct dvb_device* dvbdev_find_device (int minor){	struct list_head *entry;	list_for_each (entry, &dvb_adapter_list) {		struct list_head *entry0;		struct dvb_adapter *adap;		adap = list_entry (entry, struct dvb_adapter, list_head);		list_for_each (entry0, &adap->device_list) {			struct dvb_device *dev;			dev = list_entry (entry0, struct dvb_device, list_head);			if (nums2minor(adap->num, dev->type, dev->id) == minor)				return dev;		}	}	return NULL;}static int dvb_device_open(struct inode *inode, struct file *file){	struct dvb_device *dvbdev;		dvbdev = dvbdev_find_device (iminor(inode));	if (dvbdev && dvbdev->fops) {		int err = 0;		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,};#endif /* CONFIG_DVB_DEVFS_ONLY */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;}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;}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);}static int dvbdev_get_free_id (struct dvb_adapter *adap, int type){	u32 id = 0;	while (id < DVB_MAX_IDS) {		struct list_head *entry;		list_for_each (entry, &adap->device_list) {			struct dvb_device *dev;			dev = list_entry (entry, struct dvb_device, list_head);			if (dev->type == type && dev->id == id)				goto skip;		}		return id;skip:		id++;	}	return -ENFILE;}int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 			const struct dvb_device *template, void *priv, int type){	struct dvb_device *dvbdev;	int id;	if (down_interruptible (&dvbdev_register_lock))		return -ERESTARTSYS;	if ((id = dvbdev_get_free_id (adap, type)) < 0) {		up (&dvbdev_register_lock);		*pdvbdev = 0;		printk ("%s: could get find free device id...\n", __FUNCTION__);		return -ENFILE;	}	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);	if (!dvbdev) {		up(&dvbdev_register_lock);		return -ENOMEM;	}	up (&dvbdev_register_lock);		memcpy(dvbdev, template, sizeof(struct dvb_device));	dvbdev->type = type;	dvbdev->id = id;	dvbdev->adapter = adap;	dvbdev->priv = priv;	list_add_tail (&dvbdev->list_head, &adap->device_list);#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))	{	char name[64];	snprintf(name, sizeof(name), "%s%d", dnames[type], id);	dvbdev->devfs_handle = devfs_register(adap->devfs_handle, name,					      DEVFS_FL_DEFAULT,					      DVB_MAJOR,					      nums2minor(adap->num, type, id),					      S_IFCHR | S_IRUSR | S_IWUSR,					      dvbdev->fops, dvbdev);	dprintk("DVB: register adapter%d/%s @ minor: %i (0x%02x)\n",		adap->num, name, nums2minor(adap->num, type, id),		nums2minor(adap->num, type, id));	}#else	devfs_mk_cdev(MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)), 			S_IFCHR | S_IRUSR | S_IWUSR,			"dvb/adapter%d/%s%d", adap->num, dnames[type], id);	dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",		adap->num, dnames[type], id, nums2minor(adap->num, type, id), 		nums2minor(adap->num, type, id));#endif	return 0;}void dvb_unregister_device(struct dvb_device *dvbdev){	if (!dvbdev)		return;#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))	devfs_unregister(dvbdev->devfs_handle);#else	devfs_remove("dvb/adapter%d/%s%d", dvbdev->adapter->num,			dnames[dvbdev->type], dvbdev->id);#endif	list_del (&dvbdev->list_head);	kfree (dvbdev);}static int dvbdev_get_free_adapter_num (void){	int num = 0;	while (1) {		struct list_head *entry;		list_for_each (entry, &dvb_adapter_list) {			struct dvb_adapter *adap;			adap = list_entry (entry, struct dvb_adapter, list_head);			if (adap->num == num)				goto skip;		}		return num;skip:		num++;	}	return -ENFILE;}int dvb_register_adapter(struct dvb_adapter **padap, const char *name){	struct dvb_adapter *adap;	int num;	if (down_interruptible (&dvbdev_register_lock))		return -ERESTARTSYS;	if ((num = dvbdev_get_free_adapter_num ()) < 0) {		up (&dvbdev_register_lock);		return -ENFILE;	}	if (!(*padap = adap = kmalloc(sizeof(struct dvb_adapter), GFP_KERNEL))) {		up(&dvbdev_register_lock);		return -ENOMEM;	}	memset (adap, 0, sizeof(struct dvb_adapter));	INIT_LIST_HEAD (&adap->device_list);	printk ("DVB: registering new adapter (%s).\n", name);	#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))	{	char dirname[64];	snprintf(dirname, sizeof(dirname), "adapter%d", num);	adap->devfs_handle = devfs_mk_dir(dvb_devfs_handle, dirname, NULL);	}#else	devfs_mk_dir("dvb/adapter%d", num);#endif	adap->num = num;	adap->name = name;	list_add_tail (&adap->list_head, &dvb_adapter_list);	up (&dvbdev_register_lock);	return num;}int dvb_unregister_adapter(struct dvb_adapter *adap){#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))	devfs_unregister(adap->devfs_handle);#else	devfs_remove("dvb/adapter%d", adap->num);#endif	if (down_interruptible (&dvbdev_register_lock))		return -ERESTARTSYS;	list_del (&adap->list_head);	up (&dvbdev_register_lock);	kfree (adap);	return 0;}static int __init init_dvbdev(void){	int retval;#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))	dvb_devfs_handle = devfs_mk_dir (NULL, "dvb", NULL);#else	devfs_mk_dir("dvb");#endif#ifndef CONFIG_DVB_DEVFS_ONLY	if ((retval = register_chrdev(DVB_MAJOR,"DVB", &dvb_device_fops)))		printk("video_dev: unable to get major %d\n", DVB_MAJOR);#endif	return retval;}static void __exit exit_dvbdev(void){#ifndef CONFIG_DVB_DEVFS_ONLY	unregister_chrdev(DVB_MAJOR, "DVB");#endif#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))	devfs_unregister(dvb_devfs_handle);#else        devfs_remove("dvb");#endif}module_init(init_dvbdev);module_exit(exit_dvbdev);MODULE_DESCRIPTION("DVB Core Driver");MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");MODULE_LICENSE("GPL");MODULE_PARM(dvbdev_debug,"i");MODULE_PARM_DESC(dvbdev_debug, "enable verbose debug messages");