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