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>
28#include <linux/kernel.h>
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>
34#include <linux/mutex.h>
35#include "dvbdev.h"
36
37static DEFINE_MUTEX(dvbdev_mutex);
38static int dvbdev_debug;
39
40module_param(dvbdev_debug, int, 0644);
41MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
42
43#define dprintk if (dvbdev_debug) printk
44
45static LIST_HEAD(dvb_adapter_list);
46static DEFINE_MUTEX(dvbdev_register_lock);
47
48static const char * const dnames[] = {
49	"video", "audio", "sec", "frontend", "demux", "dvr", "ca",
50	"net", "osd"
51};
52
53#ifdef CONFIG_DVB_DYNAMIC_MINORS
54#define MAX_DVB_MINORS		256
55#define DVB_MAX_IDS		MAX_DVB_MINORS
56#else
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)
60#endif
61
62static struct class *dvb_class;
63
64static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
65static DECLARE_RWSEM(minor_rwsem);
66
67static int dvb_device_open(struct inode *inode, struct file *file)
68{
69	struct dvb_device *dvbdev;
70
71	mutex_lock(&dvbdev_mutex);
72	down_read(&minor_rwsem);
73	dvbdev = dvb_minors[iminor(inode)];
74
75	if (dvbdev && dvbdev->fops) {
76		int err = 0;
77		const struct file_operations *new_fops;
78
79		new_fops = fops_get(dvbdev->fops);
80		if (!new_fops)
81			goto fail;
82		file->private_data = dvbdev;
83		replace_fops(file, new_fops);
84		if (file->f_op->open)
85			err = file->f_op->open(inode,file);
86		up_read(&minor_rwsem);
87		mutex_unlock(&dvbdev_mutex);
88		return err;
89	}
90fail:
91	up_read(&minor_rwsem);
92	mutex_unlock(&dvbdev_mutex);
93	return -ENODEV;
94}
95
96
97static const struct file_operations dvb_device_fops =
98{
99	.owner =	THIS_MODULE,
100	.open =		dvb_device_open,
101	.llseek =	noop_llseek,
102};
103
104static struct cdev dvb_device_cdev;
105
106int dvb_generic_open(struct inode *inode, struct file *file)
107{
108	struct dvb_device *dvbdev = file->private_data;
109
110	if (!dvbdev)
111		return -ENODEV;
112
113	if (!dvbdev->users)
114		return -EBUSY;
115
116	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
117		if (!dvbdev->readers)
118			return -EBUSY;
119		dvbdev->readers--;
120	} else {
121		if (!dvbdev->writers)
122			return -EBUSY;
123		dvbdev->writers--;
124	}
125
126	dvbdev->users--;
127	return 0;
128}
129EXPORT_SYMBOL(dvb_generic_open);
130
131
132int dvb_generic_release(struct inode *inode, struct file *file)
133{
134	struct dvb_device *dvbdev = file->private_data;
135
136	if (!dvbdev)
137		return -ENODEV;
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}
148EXPORT_SYMBOL(dvb_generic_release);
149
150
151long dvb_generic_ioctl(struct file *file,
152		       unsigned int cmd, unsigned long arg)
153{
154	struct dvb_device *dvbdev = file->private_data;
155
156	if (!dvbdev)
157		return -ENODEV;
158
159	if (!dvbdev->kernel_ioctl)
160		return -EINVAL;
161
162	return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
163}
164EXPORT_SYMBOL(dvb_generic_ioctl);
165
166
167static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
168{
169	u32 id = 0;
170
171	while (id < DVB_MAX_IDS) {
172		struct dvb_device *dev;
173		list_for_each_entry(dev, &adap->device_list, list_head)
174			if (dev->type == type && dev->id == id)
175				goto skip;
176		return id;
177skip:
178		id++;
179	}
180	return -ENFILE;
181}
182
183static void dvb_register_media_device(struct dvb_device *dvbdev,
184				      int type, int minor)
185{
186#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
187	int ret = 0, npads;
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;
199
200	switch (type) {
201	case DVB_DEVICE_CA:
202	case DVB_DEVICE_DEMUX:
203	case DVB_DEVICE_FRONTEND:
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
222	switch (type) {
223	case DVB_DEVICE_FRONTEND:
224		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_FE;
225		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
226		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
227		break;
228	case DVB_DEVICE_DEMUX:
229		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DEMUX;
230		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
231		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
232		break;
233	case DVB_DEVICE_DVR:
234		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_DVR;
235		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
236		break;
237	case DVB_DEVICE_CA:
238		dvbdev->entity->type = MEDIA_ENT_T_DEVNODE_DVB_CA;
239		dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
240		dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
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
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);
256	if (ret < 0) {
257		printk(KERN_ERR
258			"%s: media_device_register_entity failed for %s\n",
259			__func__, dvbdev->entity->name);
260		kfree(dvbdev->pads);
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}
270
271int 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;
275	struct file_operations *dvbdevfops;
276	struct device *clsdev;
277	int minor;
278	int id;
279
280	mutex_lock(&dvbdev_register_lock);
281
282	if ((id = dvbdev_get_free_id (adap, type)) < 0){
283		mutex_unlock(&dvbdev_register_lock);
284		*pdvbdev = NULL;
285		printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
286		return -ENFILE;
287	}
288
289	*pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
290
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);
300		mutex_unlock(&dvbdev_register_lock);
301		return -ENOMEM;
302	}
303
304	memcpy(dvbdev, template, sizeof(struct dvb_device));
305	dvbdev->type = type;
306	dvbdev->id = id;
307	dvbdev->adapter = adap;
308	dvbdev->priv = priv;
309	dvbdev->fops = dvbdevfops;
310	init_waitqueue_head (&dvbdev->wait_queue);
311
312	memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
313	dvbdevfops->owner = adap->module;
314
315	list_add_tail (&dvbdev->list_head, &adap->device_list);
316
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);
326		up_write(&minor_rwsem);
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
338	mutex_unlock(&dvbdev_register_lock);
339
340	clsdev = device_create(dvb_class, adap->device,
341			       MKDEV(DVB_MAJOR, minor),
342			       dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
343	if (IS_ERR(clsdev)) {
344		printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
345		       __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
346		return PTR_ERR(clsdev);
347	}
348	dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
349		adap->num, dnames[type], id, minor, minor);
350
351	dvb_register_media_device(dvbdev, type, minor);
352
353	return 0;
354}
355EXPORT_SYMBOL(dvb_register_device);
356
357
358void dvb_unregister_device(struct dvb_device *dvbdev)
359{
360	if (!dvbdev)
361		return;
362
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));
368
369#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
370	if (dvbdev->entity) {
371		media_device_unregister_entity(dvbdev->entity);
372		kfree(dvbdev->entity);
373		kfree(dvbdev->pads);
374	}
375#endif
376
377	list_del (&dvbdev->list_head);
378	kfree (dvbdev->fops);
379	kfree (dvbdev);
380}
381EXPORT_SYMBOL(dvb_unregister_device);
382
383
384#ifdef CONFIG_MEDIA_CONTROLLER_DVB
385void dvb_create_media_graph(struct dvb_adapter *adap)
386{
387	struct media_device *mdev = adap->mdev;
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)
418		media_entity_create_link(fe, 1, demux, 0, MEDIA_LNK_FL_ENABLED);
419
420	if (demux && dvr)
421		media_entity_create_link(demux, 1, dvr, 0, MEDIA_LNK_FL_ENABLED);
422
423	if (demux && ca)
424		media_entity_create_link(demux, 1, ca, 0, MEDIA_LNK_FL_ENABLED);
425}
426EXPORT_SYMBOL_GPL(dvb_create_media_graph);
427#endif
428
429static 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}
440
441static int dvbdev_get_free_adapter_num (void)
442{
443	int num = 0;
444
445	while (num < DVB_MAX_ADAPTERS) {
446		if (dvbdev_check_free_adapter_num(num))
447			return num;
448		num++;
449	}
450
451	return -ENFILE;
452}
453
454
455int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
456			 struct module *module, struct device *device,
457			 short *adapter_nums)
458{
459	int i, num;
460
461	mutex_lock(&dvbdev_register_lock);
462
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) {
477		mutex_unlock(&dvbdev_register_lock);
478		return -ENFILE;
479	}
480
481	memset (adap, 0, sizeof(struct dvb_adapter));
482	INIT_LIST_HEAD (&adap->device_list);
483
484	printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
485
486	adap->num = num;
487	adap->name = name;
488	adap->module = module;
489	adap->device = device;
490	adap->mfe_shared = 0;
491	adap->mfe_dvbdev = NULL;
492	mutex_init (&adap->mfe_lock);
493
494	list_add_tail (&adap->list_head, &dvb_adapter_list);
495
496	mutex_unlock(&dvbdev_register_lock);
497
498	return num;
499}
500EXPORT_SYMBOL(dvb_register_adapter);
501
502
503int dvb_unregister_adapter(struct dvb_adapter *adap)
504{
505	mutex_lock(&dvbdev_register_lock);
506	list_del (&adap->list_head);
507	mutex_unlock(&dvbdev_register_lock);
508	return 0;
509}
510EXPORT_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...) */
517int dvb_usercopy(struct file *file,
518		     unsigned int cmd, unsigned long arg,
519		     int (*func)(struct file *file,
520		     unsigned int cmd, void *arg))
521{
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:
530		/*
531		 * For this command, the pointer is actually an integer
532		 * argument.
533		 */
534		parg = (void *) arg;
535		break;
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)) {
540			parg = sbuf;
541		} else {
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;
547		}
548
549		err = -EFAULT;
550		if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
551			goto out;
552		break;
553	}
554
555	/* call driver */
556	if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
557		err = -ENOTTY;
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)))
568			err = -EFAULT;
569		break;
570	}
571
572out:
573	kfree(mbuf);
574	return err;
575}
576
577static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
578{
579	struct dvb_device *dvbdev = dev_get_drvdata(dev);
580
581	add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
582	add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
583	add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
584	return 0;
585}
586
587static char *dvb_devnode(struct device *dev, umode_t *mode)
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
596static 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) {
602		printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
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) {
608		printk(KERN_ERR "dvb-core: unable register character device\n");
609		goto error;
610	}
611
612	dvb_class = class_create(THIS_MODULE, "dvb");
613	if (IS_ERR(dvb_class)) {
614		retval = PTR_ERR(dvb_class);
615		goto error;
616	}
617	dvb_class->dev_uevent = dvb_uevent;
618	dvb_class->devnode = dvb_devnode;
619	return 0;
620
621error:
622	cdev_del(&dvb_device_cdev);
623	unregister_chrdev_region(dev, MAX_DVB_MINORS);
624	return retval;
625}
626
627
628static void __exit exit_dvbdev(void)
629{
630	class_destroy(dvb_class);
631	cdev_del(&dvb_device_cdev);
632	unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
633}
634
635subsys_initcall(init_dvbdev);
636module_exit(exit_dvbdev);
637
638MODULE_DESCRIPTION("DVB Core Driver");
639MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
640MODULE_LICENSE("GPL");
641