Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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linux
1// SPDX-License-Identifier: LGPL-2.1-or-later
2/*
3 * dvbdev.c
4 *
5 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>
6 * & Marcus Metzler <marcus@convergence.de>
7 * for convergence integrated media GmbH
8 */
9
10#define pr_fmt(fmt) "dvbdev: " fmt
11
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/i2c.h>
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/device.h>
21#include <linux/fs.h>
22#include <linux/cdev.h>
23#include <linux/mutex.h>
24#include <media/dvbdev.h>
25
26/* Due to enum tuner_pad_index */
27#include <media/tuner.h>
28
29static DEFINE_MUTEX(dvbdev_mutex);
30static LIST_HEAD(dvbdevfops_list);
31static int dvbdev_debug;
32
33module_param(dvbdev_debug, int, 0644);
34MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
35
36#define dprintk(fmt, arg...) do { \
37 if (dvbdev_debug) \
38 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
39 __func__, ##arg); \
40} while (0)
41
42static LIST_HEAD(dvb_adapter_list);
43static DEFINE_MUTEX(dvbdev_register_lock);
44
45static const char * const dnames[] = {
46 [DVB_DEVICE_VIDEO] = "video",
47 [DVB_DEVICE_AUDIO] = "audio",
48 [DVB_DEVICE_SEC] = "sec",
49 [DVB_DEVICE_FRONTEND] = "frontend",
50 [DVB_DEVICE_DEMUX] = "demux",
51 [DVB_DEVICE_DVR] = "dvr",
52 [DVB_DEVICE_CA] = "ca",
53 [DVB_DEVICE_NET] = "net",
54 [DVB_DEVICE_OSD] = "osd"
55};
56
57#ifdef CONFIG_DVB_DYNAMIC_MINORS
58#define MAX_DVB_MINORS 256
59#define DVB_MAX_IDS MAX_DVB_MINORS
60#else
61#define DVB_MAX_IDS 4
62
63static const u8 minor_type[] = {
64 [DVB_DEVICE_VIDEO] = 0,
65 [DVB_DEVICE_AUDIO] = 1,
66 [DVB_DEVICE_SEC] = 2,
67 [DVB_DEVICE_FRONTEND] = 3,
68 [DVB_DEVICE_DEMUX] = 4,
69 [DVB_DEVICE_DVR] = 5,
70 [DVB_DEVICE_CA] = 6,
71 [DVB_DEVICE_NET] = 7,
72 [DVB_DEVICE_OSD] = 8,
73};
74
75#define nums2minor(num, type, id) \
76 (((num) << 6) | ((id) << 4) | minor_type[type])
77
78#define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
79#endif
80
81static struct class *dvb_class;
82
83static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
84static DECLARE_RWSEM(minor_rwsem);
85
86static int dvb_device_open(struct inode *inode, struct file *file)
87{
88 struct dvb_device *dvbdev;
89
90 mutex_lock(&dvbdev_mutex);
91 down_read(&minor_rwsem);
92 dvbdev = dvb_minors[iminor(inode)];
93
94 if (dvbdev && dvbdev->fops) {
95 int err = 0;
96 const struct file_operations *new_fops;
97
98 new_fops = fops_get(dvbdev->fops);
99 if (!new_fops)
100 goto fail;
101 file->private_data = dvb_device_get(dvbdev);
102 replace_fops(file, new_fops);
103 if (file->f_op->open)
104 err = file->f_op->open(inode, file);
105 up_read(&minor_rwsem);
106 mutex_unlock(&dvbdev_mutex);
107 return err;
108 }
109fail:
110 up_read(&minor_rwsem);
111 mutex_unlock(&dvbdev_mutex);
112 return -ENODEV;
113}
114
115
116static const struct file_operations dvb_device_fops =
117{
118 .owner = THIS_MODULE,
119 .open = dvb_device_open,
120 .llseek = noop_llseek,
121};
122
123static struct cdev dvb_device_cdev;
124
125int dvb_generic_open(struct inode *inode, struct file *file)
126{
127 struct dvb_device *dvbdev = file->private_data;
128
129 if (!dvbdev)
130 return -ENODEV;
131
132 if (!dvbdev->users)
133 return -EBUSY;
134
135 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
136 if (!dvbdev->readers)
137 return -EBUSY;
138 dvbdev->readers--;
139 } else {
140 if (!dvbdev->writers)
141 return -EBUSY;
142 dvbdev->writers--;
143 }
144
145 dvbdev->users--;
146 return 0;
147}
148EXPORT_SYMBOL(dvb_generic_open);
149
150
151int dvb_generic_release(struct inode *inode, struct file *file)
152{
153 struct dvb_device *dvbdev = file->private_data;
154
155 if (!dvbdev)
156 return -ENODEV;
157
158 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
159 dvbdev->readers++;
160 } else {
161 dvbdev->writers++;
162 }
163
164 dvbdev->users++;
165
166 dvb_device_put(dvbdev);
167
168 return 0;
169}
170EXPORT_SYMBOL(dvb_generic_release);
171
172
173long dvb_generic_ioctl(struct file *file,
174 unsigned int cmd, unsigned long arg)
175{
176 struct dvb_device *dvbdev = file->private_data;
177
178 if (!dvbdev)
179 return -ENODEV;
180
181 if (!dvbdev->kernel_ioctl)
182 return -EINVAL;
183
184 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
185}
186EXPORT_SYMBOL(dvb_generic_ioctl);
187
188
189static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
190{
191 u32 id = 0;
192
193 while (id < DVB_MAX_IDS) {
194 struct dvb_device *dev;
195 list_for_each_entry(dev, &adap->device_list, list_head)
196 if (dev->type == type && dev->id == id)
197 goto skip;
198 return id;
199skip:
200 id++;
201 }
202 return -ENFILE;
203}
204
205static void dvb_media_device_free(struct dvb_device *dvbdev)
206{
207#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
208 if (dvbdev->entity) {
209 media_device_unregister_entity(dvbdev->entity);
210 kfree(dvbdev->entity);
211 kfree(dvbdev->pads);
212 dvbdev->entity = NULL;
213 dvbdev->pads = NULL;
214 }
215
216 if (dvbdev->tsout_entity) {
217 int i;
218
219 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
220 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
221 kfree(dvbdev->tsout_entity[i].name);
222 }
223 kfree(dvbdev->tsout_entity);
224 kfree(dvbdev->tsout_pads);
225 dvbdev->tsout_entity = NULL;
226 dvbdev->tsout_pads = NULL;
227
228 dvbdev->tsout_num_entities = 0;
229 }
230
231 if (dvbdev->intf_devnode) {
232 media_devnode_remove(dvbdev->intf_devnode);
233 dvbdev->intf_devnode = NULL;
234 }
235
236 if (dvbdev->adapter->conn) {
237 media_device_unregister_entity(dvbdev->adapter->conn);
238 kfree(dvbdev->adapter->conn);
239 dvbdev->adapter->conn = NULL;
240 kfree(dvbdev->adapter->conn_pads);
241 dvbdev->adapter->conn_pads = NULL;
242 }
243#endif
244}
245
246#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
247static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
248 const char *name, int npads)
249{
250 int i;
251
252 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
253 GFP_KERNEL);
254 if (!dvbdev->tsout_pads)
255 return -ENOMEM;
256
257 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
258 GFP_KERNEL);
259 if (!dvbdev->tsout_entity)
260 return -ENOMEM;
261
262 dvbdev->tsout_num_entities = npads;
263
264 for (i = 0; i < npads; i++) {
265 struct media_pad *pads = &dvbdev->tsout_pads[i];
266 struct media_entity *entity = &dvbdev->tsout_entity[i];
267 int ret;
268
269 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
270 if (!entity->name)
271 return -ENOMEM;
272
273 entity->function = MEDIA_ENT_F_IO_DTV;
274 pads->flags = MEDIA_PAD_FL_SINK;
275
276 ret = media_entity_pads_init(entity, 1, pads);
277 if (ret < 0)
278 return ret;
279
280 ret = media_device_register_entity(dvbdev->adapter->mdev,
281 entity);
282 if (ret < 0)
283 return ret;
284 }
285 return 0;
286}
287
288#define DEMUX_TSOUT "demux-tsout"
289#define DVR_TSOUT "dvr-tsout"
290
291static int dvb_create_media_entity(struct dvb_device *dvbdev,
292 int type, int demux_sink_pads)
293{
294 int i, ret, npads;
295
296 switch (type) {
297 case DVB_DEVICE_FRONTEND:
298 npads = 2;
299 break;
300 case DVB_DEVICE_DVR:
301 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
302 demux_sink_pads);
303 return ret;
304 case DVB_DEVICE_DEMUX:
305 npads = 1 + demux_sink_pads;
306 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
307 demux_sink_pads);
308 if (ret < 0)
309 return ret;
310 break;
311 case DVB_DEVICE_CA:
312 npads = 2;
313 break;
314 case DVB_DEVICE_NET:
315 /*
316 * We should be creating entities for the MPE/ULE
317 * decapsulation hardware (or software implementation).
318 *
319 * However, the number of for the MPE/ULE decaps may not be
320 * fixed. As we don't have yet dynamic support for PADs at
321 * the Media Controller, let's not create the decap
322 * entities yet.
323 */
324 return 0;
325 default:
326 return 0;
327 }
328
329 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
330 if (!dvbdev->entity)
331 return -ENOMEM;
332
333 dvbdev->entity->name = dvbdev->name;
334
335 if (npads) {
336 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
337 GFP_KERNEL);
338 if (!dvbdev->pads) {
339 kfree(dvbdev->entity);
340 dvbdev->entity = NULL;
341 return -ENOMEM;
342 }
343 }
344
345 switch (type) {
346 case DVB_DEVICE_FRONTEND:
347 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
348 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
349 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
350 break;
351 case DVB_DEVICE_DEMUX:
352 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
353 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
354 for (i = 1; i < npads; i++)
355 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
356 break;
357 case DVB_DEVICE_CA:
358 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
359 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
360 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
361 break;
362 default:
363 /* Should never happen, as the first switch prevents it */
364 kfree(dvbdev->entity);
365 kfree(dvbdev->pads);
366 dvbdev->entity = NULL;
367 dvbdev->pads = NULL;
368 return 0;
369 }
370
371 if (npads) {
372 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
373 if (ret)
374 return ret;
375 }
376 ret = media_device_register_entity(dvbdev->adapter->mdev,
377 dvbdev->entity);
378 if (ret)
379 return ret;
380
381 pr_info("%s: media entity '%s' registered.\n",
382 __func__, dvbdev->entity->name);
383
384 return 0;
385}
386#endif
387
388static int dvb_register_media_device(struct dvb_device *dvbdev,
389 int type, int minor,
390 unsigned demux_sink_pads)
391{
392#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
393 struct media_link *link;
394 u32 intf_type;
395 int ret;
396
397 if (!dvbdev->adapter->mdev)
398 return 0;
399
400 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
401 if (ret)
402 return ret;
403
404 switch (type) {
405 case DVB_DEVICE_FRONTEND:
406 intf_type = MEDIA_INTF_T_DVB_FE;
407 break;
408 case DVB_DEVICE_DEMUX:
409 intf_type = MEDIA_INTF_T_DVB_DEMUX;
410 break;
411 case DVB_DEVICE_DVR:
412 intf_type = MEDIA_INTF_T_DVB_DVR;
413 break;
414 case DVB_DEVICE_CA:
415 intf_type = MEDIA_INTF_T_DVB_CA;
416 break;
417 case DVB_DEVICE_NET:
418 intf_type = MEDIA_INTF_T_DVB_NET;
419 break;
420 default:
421 return 0;
422 }
423
424 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
425 intf_type, 0,
426 DVB_MAJOR, minor);
427
428 if (!dvbdev->intf_devnode)
429 return -ENOMEM;
430
431 /*
432 * Create the "obvious" link, e. g. the ones that represent
433 * a direct association between an interface and an entity.
434 * Other links should be created elsewhere, like:
435 * DVB FE intf -> tuner
436 * DVB demux intf -> dvr
437 */
438
439 if (!dvbdev->entity)
440 return 0;
441
442 link = media_create_intf_link(dvbdev->entity,
443 &dvbdev->intf_devnode->intf,
444 MEDIA_LNK_FL_ENABLED |
445 MEDIA_LNK_FL_IMMUTABLE);
446 if (!link)
447 return -ENOMEM;
448#endif
449 return 0;
450}
451
452int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
453 const struct dvb_device *template, void *priv,
454 enum dvb_device_type type, int demux_sink_pads)
455{
456 struct dvb_device *dvbdev;
457 struct file_operations *dvbdevfops = NULL;
458 struct dvbdevfops_node *node = NULL, *new_node = NULL;
459 struct device *clsdev;
460 int minor;
461 int id, ret;
462
463 mutex_lock(&dvbdev_register_lock);
464
465 if ((id = dvbdev_get_free_id (adap, type)) < 0) {
466 mutex_unlock(&dvbdev_register_lock);
467 *pdvbdev = NULL;
468 pr_err("%s: couldn't find free device id\n", __func__);
469 return -ENFILE;
470 }
471
472 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
473 if (!dvbdev){
474 mutex_unlock(&dvbdev_register_lock);
475 return -ENOMEM;
476 }
477
478 /*
479 * When a device of the same type is probe()d more than once,
480 * the first allocated fops are used. This prevents memory leaks
481 * that can occur when the same device is probe()d repeatedly.
482 */
483 list_for_each_entry(node, &dvbdevfops_list, list_head) {
484 if (node->fops->owner == adap->module &&
485 node->type == type &&
486 node->template == template) {
487 dvbdevfops = node->fops;
488 break;
489 }
490 }
491
492 if (dvbdevfops == NULL) {
493 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
494 if (!dvbdevfops) {
495 kfree(dvbdev);
496 mutex_unlock(&dvbdev_register_lock);
497 return -ENOMEM;
498 }
499
500 new_node = kzalloc(sizeof(struct dvbdevfops_node), GFP_KERNEL);
501 if (!new_node) {
502 kfree(dvbdevfops);
503 kfree(dvbdev);
504 mutex_unlock(&dvbdev_register_lock);
505 return -ENOMEM;
506 }
507
508 new_node->fops = dvbdevfops;
509 new_node->type = type;
510 new_node->template = template;
511 list_add_tail (&new_node->list_head, &dvbdevfops_list);
512 }
513
514 memcpy(dvbdev, template, sizeof(struct dvb_device));
515 kref_init(&dvbdev->ref);
516 dvbdev->type = type;
517 dvbdev->id = id;
518 dvbdev->adapter = adap;
519 dvbdev->priv = priv;
520 dvbdev->fops = dvbdevfops;
521 init_waitqueue_head (&dvbdev->wait_queue);
522 dvbdevfops->owner = adap->module;
523 list_add_tail (&dvbdev->list_head, &adap->device_list);
524 down_write(&minor_rwsem);
525#ifdef CONFIG_DVB_DYNAMIC_MINORS
526 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
527 if (dvb_minors[minor] == NULL)
528 break;
529 if (minor == MAX_DVB_MINORS) {
530 if (new_node) {
531 list_del (&new_node->list_head);
532 kfree(dvbdevfops);
533 kfree(new_node);
534 }
535 list_del (&dvbdev->list_head);
536 kfree(dvbdev);
537 up_write(&minor_rwsem);
538 mutex_unlock(&dvbdev_register_lock);
539 return -EINVAL;
540 }
541#else
542 minor = nums2minor(adap->num, type, id);
543#endif
544 dvbdev->minor = minor;
545 dvb_minors[minor] = dvb_device_get(dvbdev);
546 up_write(&minor_rwsem);
547 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
548 if (ret) {
549 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
550 __func__);
551 if (new_node) {
552 list_del (&new_node->list_head);
553 kfree(dvbdevfops);
554 kfree(new_node);
555 }
556 dvb_media_device_free(dvbdev);
557 list_del (&dvbdev->list_head);
558 kfree(dvbdev);
559 mutex_unlock(&dvbdev_register_lock);
560 return ret;
561 }
562
563 clsdev = device_create(dvb_class, adap->device,
564 MKDEV(DVB_MAJOR, minor),
565 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
566 if (IS_ERR(clsdev)) {
567 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
568 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
569 if (new_node) {
570 list_del (&new_node->list_head);
571 kfree(dvbdevfops);
572 kfree(new_node);
573 }
574 dvb_media_device_free(dvbdev);
575 list_del (&dvbdev->list_head);
576 kfree(dvbdev);
577 mutex_unlock(&dvbdev_register_lock);
578 return PTR_ERR(clsdev);
579 }
580
581 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
582 adap->num, dnames[type], id, minor, minor);
583
584 mutex_unlock(&dvbdev_register_lock);
585 return 0;
586}
587EXPORT_SYMBOL(dvb_register_device);
588
589
590void dvb_remove_device(struct dvb_device *dvbdev)
591{
592 if (!dvbdev)
593 return;
594
595 down_write(&minor_rwsem);
596 dvb_minors[dvbdev->minor] = NULL;
597 dvb_device_put(dvbdev);
598 up_write(&minor_rwsem);
599
600 dvb_media_device_free(dvbdev);
601
602 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
603
604 list_del (&dvbdev->list_head);
605}
606EXPORT_SYMBOL(dvb_remove_device);
607
608
609static void dvb_free_device(struct kref *ref)
610{
611 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
612
613 kfree (dvbdev);
614}
615
616
617struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
618{
619 kref_get(&dvbdev->ref);
620 return dvbdev;
621}
622EXPORT_SYMBOL(dvb_device_get);
623
624
625void dvb_device_put(struct dvb_device *dvbdev)
626{
627 if (dvbdev)
628 kref_put(&dvbdev->ref, dvb_free_device);
629}
630
631
632void dvb_unregister_device(struct dvb_device *dvbdev)
633{
634 dvb_remove_device(dvbdev);
635 dvb_device_put(dvbdev);
636}
637EXPORT_SYMBOL(dvb_unregister_device);
638
639
640#ifdef CONFIG_MEDIA_CONTROLLER_DVB
641
642static int dvb_create_io_intf_links(struct dvb_adapter *adap,
643 struct media_interface *intf,
644 char *name)
645{
646 struct media_device *mdev = adap->mdev;
647 struct media_entity *entity;
648 struct media_link *link;
649
650 media_device_for_each_entity(entity, mdev) {
651 if (entity->function == MEDIA_ENT_F_IO_DTV) {
652 if (strncmp(entity->name, name, strlen(name)))
653 continue;
654 link = media_create_intf_link(entity, intf,
655 MEDIA_LNK_FL_ENABLED |
656 MEDIA_LNK_FL_IMMUTABLE);
657 if (!link)
658 return -ENOMEM;
659 }
660 }
661 return 0;
662}
663
664int dvb_create_media_graph(struct dvb_adapter *adap,
665 bool create_rf_connector)
666{
667 struct media_device *mdev = adap->mdev;
668 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
669 struct media_entity *demux = NULL, *ca = NULL;
670 struct media_link *link;
671 struct media_interface *intf;
672 unsigned demux_pad = 0;
673 unsigned dvr_pad = 0;
674 unsigned ntuner = 0, ndemod = 0;
675 int ret, pad_source, pad_sink;
676 static const char *connector_name = "Television";
677
678 if (!mdev)
679 return 0;
680
681 media_device_for_each_entity(entity, mdev) {
682 switch (entity->function) {
683 case MEDIA_ENT_F_TUNER:
684 tuner = entity;
685 ntuner++;
686 break;
687 case MEDIA_ENT_F_DTV_DEMOD:
688 demod = entity;
689 ndemod++;
690 break;
691 case MEDIA_ENT_F_TS_DEMUX:
692 demux = entity;
693 break;
694 case MEDIA_ENT_F_DTV_CA:
695 ca = entity;
696 break;
697 }
698 }
699
700 /*
701 * Prepare to signalize to media_create_pad_links() that multiple
702 * entities of the same type exists and a 1:n or n:1 links need to be
703 * created.
704 * NOTE: if both tuner and demod have multiple instances, it is up
705 * to the caller driver to create such links.
706 */
707 if (ntuner > 1)
708 tuner = NULL;
709 if (ndemod > 1)
710 demod = NULL;
711
712 if (create_rf_connector) {
713 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
714 if (!conn)
715 return -ENOMEM;
716 adap->conn = conn;
717
718 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
719 if (!adap->conn_pads)
720 return -ENOMEM;
721
722 conn->flags = MEDIA_ENT_FL_CONNECTOR;
723 conn->function = MEDIA_ENT_F_CONN_RF;
724 conn->name = connector_name;
725 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
726
727 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
728 if (ret)
729 return ret;
730
731 ret = media_device_register_entity(mdev, conn);
732 if (ret)
733 return ret;
734
735 if (!ntuner) {
736 ret = media_create_pad_links(mdev,
737 MEDIA_ENT_F_CONN_RF,
738 conn, 0,
739 MEDIA_ENT_F_DTV_DEMOD,
740 demod, 0,
741 MEDIA_LNK_FL_ENABLED,
742 false);
743 } else {
744 pad_sink = media_get_pad_index(tuner, true,
745 PAD_SIGNAL_ANALOG);
746 if (pad_sink < 0)
747 return -EINVAL;
748 ret = media_create_pad_links(mdev,
749 MEDIA_ENT_F_CONN_RF,
750 conn, 0,
751 MEDIA_ENT_F_TUNER,
752 tuner, pad_sink,
753 MEDIA_LNK_FL_ENABLED,
754 false);
755 }
756 if (ret)
757 return ret;
758 }
759
760 if (ntuner && ndemod) {
761 /* NOTE: first found tuner source pad presumed correct */
762 pad_source = media_get_pad_index(tuner, false,
763 PAD_SIGNAL_ANALOG);
764 if (pad_source < 0)
765 return -EINVAL;
766 ret = media_create_pad_links(mdev,
767 MEDIA_ENT_F_TUNER,
768 tuner, pad_source,
769 MEDIA_ENT_F_DTV_DEMOD,
770 demod, 0, MEDIA_LNK_FL_ENABLED,
771 false);
772 if (ret)
773 return ret;
774 }
775
776 if (ndemod && demux) {
777 ret = media_create_pad_links(mdev,
778 MEDIA_ENT_F_DTV_DEMOD,
779 demod, 1,
780 MEDIA_ENT_F_TS_DEMUX,
781 demux, 0, MEDIA_LNK_FL_ENABLED,
782 false);
783 if (ret)
784 return ret;
785 }
786 if (demux && ca) {
787 ret = media_create_pad_link(demux, 1, ca,
788 0, MEDIA_LNK_FL_ENABLED);
789 if (ret)
790 return ret;
791 }
792
793 /* Create demux links for each ringbuffer/pad */
794 if (demux) {
795 media_device_for_each_entity(entity, mdev) {
796 if (entity->function == MEDIA_ENT_F_IO_DTV) {
797 if (!strncmp(entity->name, DVR_TSOUT,
798 strlen(DVR_TSOUT))) {
799 ret = media_create_pad_link(demux,
800 ++dvr_pad,
801 entity, 0, 0);
802 if (ret)
803 return ret;
804 }
805 if (!strncmp(entity->name, DEMUX_TSOUT,
806 strlen(DEMUX_TSOUT))) {
807 ret = media_create_pad_link(demux,
808 ++demux_pad,
809 entity, 0, 0);
810 if (ret)
811 return ret;
812 }
813 }
814 }
815 }
816
817 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
818 media_device_for_each_intf(intf, mdev) {
819 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
820 link = media_create_intf_link(ca, intf,
821 MEDIA_LNK_FL_ENABLED |
822 MEDIA_LNK_FL_IMMUTABLE);
823 if (!link)
824 return -ENOMEM;
825 }
826
827 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
828 link = media_create_intf_link(tuner, intf,
829 MEDIA_LNK_FL_ENABLED |
830 MEDIA_LNK_FL_IMMUTABLE);
831 if (!link)
832 return -ENOMEM;
833 }
834#if 0
835 /*
836 * Indirect link - let's not create yet, as we don't know how
837 * to handle indirect links, nor if this will
838 * actually be needed.
839 */
840 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
841 link = media_create_intf_link(demux, intf,
842 MEDIA_LNK_FL_ENABLED |
843 MEDIA_LNK_FL_IMMUTABLE);
844 if (!link)
845 return -ENOMEM;
846 }
847#endif
848 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
849 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
850 if (ret)
851 return ret;
852 }
853 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
854 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
855 if (ret)
856 return ret;
857 }
858 }
859 return 0;
860}
861EXPORT_SYMBOL_GPL(dvb_create_media_graph);
862#endif
863
864static int dvbdev_check_free_adapter_num(int num)
865{
866 struct list_head *entry;
867 list_for_each(entry, &dvb_adapter_list) {
868 struct dvb_adapter *adap;
869 adap = list_entry(entry, struct dvb_adapter, list_head);
870 if (adap->num == num)
871 return 0;
872 }
873 return 1;
874}
875
876static int dvbdev_get_free_adapter_num (void)
877{
878 int num = 0;
879
880 while (num < DVB_MAX_ADAPTERS) {
881 if (dvbdev_check_free_adapter_num(num))
882 return num;
883 num++;
884 }
885
886 return -ENFILE;
887}
888
889
890int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
891 struct module *module, struct device *device,
892 short *adapter_nums)
893{
894 int i, num;
895
896 mutex_lock(&dvbdev_register_lock);
897
898 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
899 num = adapter_nums[i];
900 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
901 /* use the one the driver asked for */
902 if (dvbdev_check_free_adapter_num(num))
903 break;
904 } else {
905 num = dvbdev_get_free_adapter_num();
906 break;
907 }
908 num = -1;
909 }
910
911 if (num < 0) {
912 mutex_unlock(&dvbdev_register_lock);
913 return -ENFILE;
914 }
915
916 memset (adap, 0, sizeof(struct dvb_adapter));
917 INIT_LIST_HEAD (&adap->device_list);
918
919 pr_info("DVB: registering new adapter (%s)\n", name);
920
921 adap->num = num;
922 adap->name = name;
923 adap->module = module;
924 adap->device = device;
925 adap->mfe_shared = 0;
926 adap->mfe_dvbdev = NULL;
927 mutex_init (&adap->mfe_lock);
928
929#ifdef CONFIG_MEDIA_CONTROLLER_DVB
930 mutex_init(&adap->mdev_lock);
931#endif
932
933 list_add_tail (&adap->list_head, &dvb_adapter_list);
934
935 mutex_unlock(&dvbdev_register_lock);
936
937 return num;
938}
939EXPORT_SYMBOL(dvb_register_adapter);
940
941
942int dvb_unregister_adapter(struct dvb_adapter *adap)
943{
944 mutex_lock(&dvbdev_register_lock);
945 list_del (&adap->list_head);
946 mutex_unlock(&dvbdev_register_lock);
947 return 0;
948}
949EXPORT_SYMBOL(dvb_unregister_adapter);
950
951/* if the miracle happens and "generic_usercopy()" is included into
952 the kernel, then this can vanish. please don't make the mistake and
953 define this as video_usercopy(). this will introduce a dependency
954 to the v4l "videodev.o" module, which is unnecessary for some
955 cards (ie. the budget dvb-cards don't need the v4l module...) */
956int dvb_usercopy(struct file *file,
957 unsigned int cmd, unsigned long arg,
958 int (*func)(struct file *file,
959 unsigned int cmd, void *arg))
960{
961 char sbuf[128];
962 void *mbuf = NULL;
963 void *parg = NULL;
964 int err = -EINVAL;
965
966 /* Copy arguments into temp kernel buffer */
967 switch (_IOC_DIR(cmd)) {
968 case _IOC_NONE:
969 /*
970 * For this command, the pointer is actually an integer
971 * argument.
972 */
973 parg = (void *) arg;
974 break;
975 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
976 case _IOC_WRITE:
977 case (_IOC_WRITE | _IOC_READ):
978 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
979 parg = sbuf;
980 } else {
981 /* too big to allocate from stack */
982 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
983 if (NULL == mbuf)
984 return -ENOMEM;
985 parg = mbuf;
986 }
987
988 err = -EFAULT;
989 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
990 goto out;
991 break;
992 }
993
994 /* call driver */
995 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
996 err = -ENOTTY;
997
998 if (err < 0)
999 goto out;
1000
1001 /* Copy results into user buffer */
1002 switch (_IOC_DIR(cmd))
1003 {
1004 case _IOC_READ:
1005 case (_IOC_WRITE | _IOC_READ):
1006 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
1007 err = -EFAULT;
1008 break;
1009 }
1010
1011out:
1012 kfree(mbuf);
1013 return err;
1014}
1015
1016#if IS_ENABLED(CONFIG_I2C)
1017struct i2c_client *dvb_module_probe(const char *module_name,
1018 const char *name,
1019 struct i2c_adapter *adap,
1020 unsigned char addr,
1021 void *platform_data)
1022{
1023 struct i2c_client *client;
1024 struct i2c_board_info *board_info;
1025
1026 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
1027 if (!board_info)
1028 return NULL;
1029
1030 if (name)
1031 strscpy(board_info->type, name, I2C_NAME_SIZE);
1032 else
1033 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1034
1035 board_info->addr = addr;
1036 board_info->platform_data = platform_data;
1037 request_module(module_name);
1038 client = i2c_new_client_device(adap, board_info);
1039 if (!i2c_client_has_driver(client)) {
1040 kfree(board_info);
1041 return NULL;
1042 }
1043
1044 if (!try_module_get(client->dev.driver->owner)) {
1045 i2c_unregister_device(client);
1046 client = NULL;
1047 }
1048
1049 kfree(board_info);
1050 return client;
1051}
1052EXPORT_SYMBOL_GPL(dvb_module_probe);
1053
1054void dvb_module_release(struct i2c_client *client)
1055{
1056 if (!client)
1057 return;
1058
1059 module_put(client->dev.driver->owner);
1060 i2c_unregister_device(client);
1061}
1062EXPORT_SYMBOL_GPL(dvb_module_release);
1063#endif
1064
1065static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)
1066{
1067 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1068
1069 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1070 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1071 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1072 return 0;
1073}
1074
1075static char *dvb_devnode(const struct device *dev, umode_t *mode)
1076{
1077 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1078
1079 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1080 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1081}
1082
1083
1084static int __init init_dvbdev(void)
1085{
1086 int retval;
1087 dev_t dev = MKDEV(DVB_MAJOR, 0);
1088
1089 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1090 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1091 return retval;
1092 }
1093
1094 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1095 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1096 pr_err("dvb-core: unable register character device\n");
1097 goto error;
1098 }
1099
1100 dvb_class = class_create("dvb");
1101 if (IS_ERR(dvb_class)) {
1102 retval = PTR_ERR(dvb_class);
1103 goto error;
1104 }
1105 dvb_class->dev_uevent = dvb_uevent;
1106 dvb_class->devnode = dvb_devnode;
1107 return 0;
1108
1109error:
1110 cdev_del(&dvb_device_cdev);
1111 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1112 return retval;
1113}
1114
1115
1116static void __exit exit_dvbdev(void)
1117{
1118 struct dvbdevfops_node *node, *next;
1119
1120 class_destroy(dvb_class);
1121 cdev_del(&dvb_device_cdev);
1122 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1123
1124 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
1125 list_del (&node->list_head);
1126 kfree(node->fops);
1127 kfree(node);
1128 }
1129}
1130
1131subsys_initcall(init_dvbdev);
1132module_exit(exit_dvbdev);
1133
1134MODULE_DESCRIPTION("DVB Core Driver");
1135MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1136MODULE_LICENSE("GPL");