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Linux 4.16.11
[linux/fpc-iii.git] / drivers / media / dvb-core / dvbdev.c
blob60e9c2ba26be6dca5700184655e5f4d778aa4491
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 */
19
20 #define pr_fmt(fmt) "dvbdev: " fmt
21
22 #include <linux/types.h>
23 #include <linux/errno.h>
24 #include <linux/string.h>
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/device.h>
30 #include <linux/fs.h>
31 #include <linux/cdev.h>
32 #include <linux/mutex.h>
33 #include <media/dvbdev.h>
34
35 /* Due to enum tuner_pad_index */
36 #include <media/tuner.h>
37
38 static DEFINE_MUTEX(dvbdev_mutex);
39 static int dvbdev_debug;
40
41 module_param(dvbdev_debug, int, 0644);
42 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
43
44 #define dprintk(fmt, arg...) do { \
45 if (dvbdev_debug) \
46 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
47 __func__, ##arg); \
48 } while (0)
49
50 static LIST_HEAD(dvb_adapter_list);
51 static DEFINE_MUTEX(dvbdev_register_lock);
52
53 static const char * const dnames[] = {
54 [DVB_DEVICE_VIDEO] = "video",
55 [DVB_DEVICE_AUDIO] = "audio",
56 [DVB_DEVICE_SEC] = "sec",
57 [DVB_DEVICE_FRONTEND] = "frontend",
58 [DVB_DEVICE_DEMUX] = "demux",
59 [DVB_DEVICE_DVR] = "dvr",
60 [DVB_DEVICE_CA] = "ca",
61 [DVB_DEVICE_NET] = "net",
62 [DVB_DEVICE_OSD] = "osd"
63 };
64
65 #ifdef CONFIG_DVB_DYNAMIC_MINORS
66 #define MAX_DVB_MINORS 256
67 #define DVB_MAX_IDS MAX_DVB_MINORS
68 #else
69 #define DVB_MAX_IDS 4
70
71 static const u8 minor_type[] = {
72 [DVB_DEVICE_VIDEO] = 0,
73 [DVB_DEVICE_AUDIO] = 1,
74 [DVB_DEVICE_SEC] = 2,
75 [DVB_DEVICE_FRONTEND] = 3,
76 [DVB_DEVICE_DEMUX] = 4,
77 [DVB_DEVICE_DVR] = 5,
78 [DVB_DEVICE_CA] = 6,
79 [DVB_DEVICE_NET] = 7,
80 [DVB_DEVICE_OSD] = 8,
81 };
82
83 #define nums2minor(num, type, id) \
84 (((num) << 6) | ((id) << 4) | minor_type[type])
85
86 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
87 #endif
88
89 static struct class *dvb_class;
90
91 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
92 static DECLARE_RWSEM(minor_rwsem);
93
94 static int dvb_device_open(struct inode *inode, struct file *file)
95 {
96 struct dvb_device *dvbdev;
97
98 mutex_lock(&dvbdev_mutex);
99 down_read(&minor_rwsem);
100 dvbdev = dvb_minors[iminor(inode)];
101
102 if (dvbdev && dvbdev->fops) {
103 int err = 0;
104 const struct file_operations *new_fops;
105
106 new_fops = fops_get(dvbdev->fops);
107 if (!new_fops)
108 goto fail;
109 file->private_data = dvbdev;
110 replace_fops(file, new_fops);
111 if (file->f_op->open)
112 err = file->f_op->open(inode, file);
113 up_read(&minor_rwsem);
114 mutex_unlock(&dvbdev_mutex);
115 return err;
116 }
117 fail:
118 up_read(&minor_rwsem);
119 mutex_unlock(&dvbdev_mutex);
120 return -ENODEV;
121 }
122
123
124 static const struct file_operations dvb_device_fops =
125 {
126 .owner = THIS_MODULE,
127 .open = dvb_device_open,
128 .llseek = noop_llseek,
129 };
130
131 static struct cdev dvb_device_cdev;
132
133 int dvb_generic_open(struct inode *inode, struct file *file)
134 {
135 struct dvb_device *dvbdev = file->private_data;
136
137 if (!dvbdev)
138 return -ENODEV;
139
140 if (!dvbdev->users)
141 return -EBUSY;
142
143 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
144 if (!dvbdev->readers)
145 return -EBUSY;
146 dvbdev->readers--;
147 } else {
148 if (!dvbdev->writers)
149 return -EBUSY;
150 dvbdev->writers--;
151 }
152
153 dvbdev->users--;
154 return 0;
155 }
156 EXPORT_SYMBOL(dvb_generic_open);
157
158
159 int dvb_generic_release(struct inode *inode, struct file *file)
160 {
161 struct dvb_device *dvbdev = file->private_data;
162
163 if (!dvbdev)
164 return -ENODEV;
165
166 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
167 dvbdev->readers++;
168 } else {
169 dvbdev->writers++;
170 }
171
172 dvbdev->users++;
173 return 0;
174 }
175 EXPORT_SYMBOL(dvb_generic_release);
176
177
178 long dvb_generic_ioctl(struct file *file,
179 unsigned int cmd, unsigned long arg)
180 {
181 struct dvb_device *dvbdev = file->private_data;
182
183 if (!dvbdev)
184 return -ENODEV;
185
186 if (!dvbdev->kernel_ioctl)
187 return -EINVAL;
188
189 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
190 }
191 EXPORT_SYMBOL(dvb_generic_ioctl);
192
193
194 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
195 {
196 u32 id = 0;
197
198 while (id < DVB_MAX_IDS) {
199 struct dvb_device *dev;
200 list_for_each_entry(dev, &adap->device_list, list_head)
201 if (dev->type == type && dev->id == id)
202 goto skip;
203 return id;
204 skip:
205 id++;
206 }
207 return -ENFILE;
208 }
209
210 static void dvb_media_device_free(struct dvb_device *dvbdev)
211 {
212 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
213 if (dvbdev->entity) {
214 media_device_unregister_entity(dvbdev->entity);
215 kfree(dvbdev->entity);
216 kfree(dvbdev->pads);
217 dvbdev->entity = NULL;
218 dvbdev->pads = NULL;
219 }
220
221 if (dvbdev->tsout_entity) {
222 int i;
223
224 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
225 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
226 kfree(dvbdev->tsout_entity[i].name);
227 }
228 kfree(dvbdev->tsout_entity);
229 kfree(dvbdev->tsout_pads);
230 dvbdev->tsout_entity = NULL;
231 dvbdev->tsout_pads = NULL;
232
233 dvbdev->tsout_num_entities = 0;
234 }
235
236 if (dvbdev->intf_devnode) {
237 media_devnode_remove(dvbdev->intf_devnode);
238 dvbdev->intf_devnode = NULL;
239 }
240
241 if (dvbdev->adapter->conn) {
242 media_device_unregister_entity(dvbdev->adapter->conn);
243 dvbdev->adapter->conn = NULL;
244 kfree(dvbdev->adapter->conn_pads);
245 dvbdev->adapter->conn_pads = NULL;
246 }
247 #endif
248 }
249
250 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
251 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
252 const char *name, int npads)
253 {
254 int i, ret = 0;
255
256 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
257 GFP_KERNEL);
258 if (!dvbdev->tsout_pads)
259 return -ENOMEM;
260
261 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
262 GFP_KERNEL);
263 if (!dvbdev->tsout_entity)
264 return -ENOMEM;
265
266 dvbdev->tsout_num_entities = npads;
267
268 for (i = 0; i < npads; i++) {
269 struct media_pad *pads = &dvbdev->tsout_pads[i];
270 struct media_entity *entity = &dvbdev->tsout_entity[i];
271
272 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
273 if (!entity->name)
274 return -ENOMEM;
275
276 entity->function = MEDIA_ENT_F_IO_DTV;
277 pads->flags = MEDIA_PAD_FL_SINK;
278
279 ret = media_entity_pads_init(entity, 1, pads);
280 if (ret < 0)
281 return ret;
282
283 ret = media_device_register_entity(dvbdev->adapter->mdev,
284 entity);
285 if (ret < 0)
286 return ret;
287 }
288 return 0;
289 }
290
291 #define DEMUX_TSOUT "demux-tsout"
292 #define DVR_TSOUT "dvr-tsout"
293
294 static int dvb_create_media_entity(struct dvb_device *dvbdev,
295 int type, int demux_sink_pads)
296 {
297 int i, ret, npads;
298
299 switch (type) {
300 case DVB_DEVICE_FRONTEND:
301 npads = 2;
302 break;
303 case DVB_DEVICE_DVR:
304 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
305 demux_sink_pads);
306 return ret;
307 case DVB_DEVICE_DEMUX:
308 npads = 1 + demux_sink_pads;
309 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
310 demux_sink_pads);
311 if (ret < 0)
312 return ret;
313 break;
314 case DVB_DEVICE_CA:
315 npads = 2;
316 break;
317 case DVB_DEVICE_NET:
318 /*
319 * We should be creating entities for the MPE/ULE
320 * decapsulation hardware (or software implementation).
321 *
322 * However, the number of for the MPE/ULE decaps may not be
323 * fixed. As we don't have yet dynamic support for PADs at
324 * the Media Controller, let's not create the decap
325 * entities yet.
326 */
327 return 0;
328 default:
329 return 0;
330 }
331
332 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
333 if (!dvbdev->entity)
334 return -ENOMEM;
335
336 dvbdev->entity->name = dvbdev->name;
337
338 if (npads) {
339 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
340 GFP_KERNEL);
341 if (!dvbdev->pads)
342 return -ENOMEM;
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
388 static 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, &dvbdev->intf_devnode->intf,
443 MEDIA_LNK_FL_ENABLED);
444 if (!link)
445 return -ENOMEM;
446 #endif
447 return 0;
448 }
449
450 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
451 const struct dvb_device *template, void *priv,
452 enum dvb_device_type type, int demux_sink_pads)
453 {
454 struct dvb_device *dvbdev;
455 struct file_operations *dvbdevfops;
456 struct device *clsdev;
457 int minor;
458 int id, ret;
459
460 mutex_lock(&dvbdev_register_lock);
461
462 if ((id = dvbdev_get_free_id (adap, type)) < 0){
463 mutex_unlock(&dvbdev_register_lock);
464 *pdvbdev = NULL;
465 pr_err("%s: couldn't find free device id\n", __func__);
466 return -ENFILE;
467 }
468
469 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
470
471 if (!dvbdev){
472 mutex_unlock(&dvbdev_register_lock);
473 return -ENOMEM;
474 }
475
476 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
477
478 if (!dvbdevfops){
479 kfree (dvbdev);
480 mutex_unlock(&dvbdev_register_lock);
481 return -ENOMEM;
482 }
483
484 memcpy(dvbdev, template, sizeof(struct dvb_device));
485 dvbdev->type = type;
486 dvbdev->id = id;
487 dvbdev->adapter = adap;
488 dvbdev->priv = priv;
489 dvbdev->fops = dvbdevfops;
490 init_waitqueue_head (&dvbdev->wait_queue);
491
492 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
493 dvbdevfops->owner = adap->module;
494
495 list_add_tail (&dvbdev->list_head, &adap->device_list);
496
497 down_write(&minor_rwsem);
498 #ifdef CONFIG_DVB_DYNAMIC_MINORS
499 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
500 if (dvb_minors[minor] == NULL)
501 break;
502
503 if (minor == MAX_DVB_MINORS) {
504 kfree(dvbdevfops);
505 kfree(dvbdev);
506 up_write(&minor_rwsem);
507 mutex_unlock(&dvbdev_register_lock);
508 return -EINVAL;
509 }
510 #else
511 minor = nums2minor(adap->num, type, id);
512 #endif
513
514 dvbdev->minor = minor;
515 dvb_minors[minor] = dvbdev;
516 up_write(&minor_rwsem);
517
518 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
519 if (ret) {
520 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
521 __func__);
522
523 dvb_media_device_free(dvbdev);
524 kfree(dvbdevfops);
525 kfree(dvbdev);
526 up_write(&minor_rwsem);
527 mutex_unlock(&dvbdev_register_lock);
528 return ret;
529 }
530
531 mutex_unlock(&dvbdev_register_lock);
532
533 clsdev = device_create(dvb_class, adap->device,
534 MKDEV(DVB_MAJOR, minor),
535 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
536 if (IS_ERR(clsdev)) {
537 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
538 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
539 return PTR_ERR(clsdev);
540 }
541 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
542 adap->num, dnames[type], id, minor, minor);
543
544 return 0;
545 }
546 EXPORT_SYMBOL(dvb_register_device);
547
548
549 void dvb_remove_device(struct dvb_device *dvbdev)
550 {
551 if (!dvbdev)
552 return;
553
554 down_write(&minor_rwsem);
555 dvb_minors[dvbdev->minor] = NULL;
556 up_write(&minor_rwsem);
557
558 dvb_media_device_free(dvbdev);
559
560 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
561
562 list_del (&dvbdev->list_head);
563 }
564 EXPORT_SYMBOL(dvb_remove_device);
565
566
567 void dvb_free_device(struct dvb_device *dvbdev)
568 {
569 if (!dvbdev)
570 return;
571
572 kfree (dvbdev->fops);
573 kfree (dvbdev);
574 }
575 EXPORT_SYMBOL(dvb_free_device);
576
577
578 void dvb_unregister_device(struct dvb_device *dvbdev)
579 {
580 dvb_remove_device(dvbdev);
581 dvb_free_device(dvbdev);
582 }
583 EXPORT_SYMBOL(dvb_unregister_device);
584
585
586 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
587
588 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
589 struct media_interface *intf,
590 char *name)
591 {
592 struct media_device *mdev = adap->mdev;
593 struct media_entity *entity;
594 struct media_link *link;
595
596 media_device_for_each_entity(entity, mdev) {
597 if (entity->function == MEDIA_ENT_F_IO_DTV) {
598 if (strncmp(entity->name, name, strlen(name)))
599 continue;
600 link = media_create_intf_link(entity, intf,
601 MEDIA_LNK_FL_ENABLED);
602 if (!link)
603 return -ENOMEM;
604 }
605 }
606 return 0;
607 }
608
609 int dvb_create_media_graph(struct dvb_adapter *adap,
610 bool create_rf_connector)
611 {
612 struct media_device *mdev = adap->mdev;
613 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
614 struct media_entity *demux = NULL, *ca = NULL;
615 struct media_link *link;
616 struct media_interface *intf;
617 unsigned demux_pad = 0;
618 unsigned dvr_pad = 0;
619 unsigned ntuner = 0, ndemod = 0;
620 int ret;
621 static const char *connector_name = "Television";
622
623 if (!mdev)
624 return 0;
625
626 media_device_for_each_entity(entity, mdev) {
627 switch (entity->function) {
628 case MEDIA_ENT_F_TUNER:
629 tuner = entity;
630 ntuner++;
631 break;
632 case MEDIA_ENT_F_DTV_DEMOD:
633 demod = entity;
634 ndemod++;
635 break;
636 case MEDIA_ENT_F_TS_DEMUX:
637 demux = entity;
638 break;
639 case MEDIA_ENT_F_DTV_CA:
640 ca = entity;
641 break;
642 }
643 }
644
645 /*
646 * Prepare to signalize to media_create_pad_links() that multiple
647 * entities of the same type exists and a 1:n or n:1 links need to be
648 * created.
649 * NOTE: if both tuner and demod have multiple instances, it is up
650 * to the caller driver to create such links.
651 */
652 if (ntuner > 1)
653 tuner = NULL;
654 if (ndemod > 1)
655 demod = NULL;
656
657 if (create_rf_connector) {
658 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
659 if (!conn)
660 return -ENOMEM;
661 adap->conn = conn;
662
663 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
664 if (!adap->conn_pads)
665 return -ENOMEM;
666
667 conn->flags = MEDIA_ENT_FL_CONNECTOR;
668 conn->function = MEDIA_ENT_F_CONN_RF;
669 conn->name = connector_name;
670 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
671
672 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
673 if (ret)
674 return ret;
675
676 ret = media_device_register_entity(mdev, conn);
677 if (ret)
678 return ret;
679
680 if (!ntuner)
681 ret = media_create_pad_links(mdev,
682 MEDIA_ENT_F_CONN_RF,
683 conn, 0,
684 MEDIA_ENT_F_DTV_DEMOD,
685 demod, 0,
686 MEDIA_LNK_FL_ENABLED,
687 false);
688 else
689 ret = media_create_pad_links(mdev,
690 MEDIA_ENT_F_CONN_RF,
691 conn, 0,
692 MEDIA_ENT_F_TUNER,
693 tuner, TUNER_PAD_RF_INPUT,
694 MEDIA_LNK_FL_ENABLED,
695 false);
696 if (ret)
697 return ret;
698 }
699
700 if (ntuner && ndemod) {
701 ret = media_create_pad_links(mdev,
702 MEDIA_ENT_F_TUNER,
703 tuner, TUNER_PAD_OUTPUT,
704 MEDIA_ENT_F_DTV_DEMOD,
705 demod, 0, MEDIA_LNK_FL_ENABLED,
706 false);
707 if (ret)
708 return ret;
709 }
710
711 if (ndemod && demux) {
712 ret = media_create_pad_links(mdev,
713 MEDIA_ENT_F_DTV_DEMOD,
714 demod, 1,
715 MEDIA_ENT_F_TS_DEMUX,
716 demux, 0, MEDIA_LNK_FL_ENABLED,
717 false);
718 if (ret)
719 return ret;
720 }
721 if (demux && ca) {
722 ret = media_create_pad_link(demux, 1, ca,
723 0, MEDIA_LNK_FL_ENABLED);
724 if (ret)
725 return ret;
726 }
727
728 /* Create demux links for each ringbuffer/pad */
729 if (demux) {
730 media_device_for_each_entity(entity, mdev) {
731 if (entity->function == MEDIA_ENT_F_IO_DTV) {
732 if (!strncmp(entity->name, DVR_TSOUT,
733 strlen(DVR_TSOUT))) {
734 ret = media_create_pad_link(demux,
735 ++dvr_pad,
736 entity, 0, 0);
737 if (ret)
738 return ret;
739 }
740 if (!strncmp(entity->name, DEMUX_TSOUT,
741 strlen(DEMUX_TSOUT))) {
742 ret = media_create_pad_link(demux,
743 ++demux_pad,
744 entity, 0, 0);
745 if (ret)
746 return ret;
747 }
748 }
749 }
750 }
751
752 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
753 media_device_for_each_intf(intf, mdev) {
754 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
755 link = media_create_intf_link(ca, intf,
756 MEDIA_LNK_FL_ENABLED);
757 if (!link)
758 return -ENOMEM;
759 }
760
761 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
762 link = media_create_intf_link(tuner, intf,
763 MEDIA_LNK_FL_ENABLED);
764 if (!link)
765 return -ENOMEM;
766 }
767 #if 0
768 /*
769 * Indirect link - let's not create yet, as we don't know how
770 * to handle indirect links, nor if this will
771 * actually be needed.
772 */
773 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
774 link = media_create_intf_link(demux, intf,
775 MEDIA_LNK_FL_ENABLED);
776 if (!link)
777 return -ENOMEM;
778 }
779 #endif
780 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
781 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
782 if (ret)
783 return ret;
784 }
785 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
786 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
787 if (ret)
788 return ret;
789 }
790 }
791 return 0;
792 }
793 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
794 #endif
795
796 static int dvbdev_check_free_adapter_num(int num)
797 {
798 struct list_head *entry;
799 list_for_each(entry, &dvb_adapter_list) {
800 struct dvb_adapter *adap;
801 adap = list_entry(entry, struct dvb_adapter, list_head);
802 if (adap->num == num)
803 return 0;
804 }
805 return 1;
806 }
807
808 static int dvbdev_get_free_adapter_num (void)
809 {
810 int num = 0;
811
812 while (num < DVB_MAX_ADAPTERS) {
813 if (dvbdev_check_free_adapter_num(num))
814 return num;
815 num++;
816 }
817
818 return -ENFILE;
819 }
820
821
822 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
823 struct module *module, struct device *device,
824 short *adapter_nums)
825 {
826 int i, num;
827
828 mutex_lock(&dvbdev_register_lock);
829
830 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
831 num = adapter_nums[i];
832 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
833 /* use the one the driver asked for */
834 if (dvbdev_check_free_adapter_num(num))
835 break;
836 } else {
837 num = dvbdev_get_free_adapter_num();
838 break;
839 }
840 num = -1;
841 }
842
843 if (num < 0) {
844 mutex_unlock(&dvbdev_register_lock);
845 return -ENFILE;
846 }
847
848 memset (adap, 0, sizeof(struct dvb_adapter));
849 INIT_LIST_HEAD (&adap->device_list);
850
851 pr_info("DVB: registering new adapter (%s)\n", name);
852
853 adap->num = num;
854 adap->name = name;
855 adap->module = module;
856 adap->device = device;
857 adap->mfe_shared = 0;
858 adap->mfe_dvbdev = NULL;
859 mutex_init (&adap->mfe_lock);
860
861 list_add_tail (&adap->list_head, &dvb_adapter_list);
862
863 mutex_unlock(&dvbdev_register_lock);
864
865 return num;
866 }
867 EXPORT_SYMBOL(dvb_register_adapter);
868
869
870 int dvb_unregister_adapter(struct dvb_adapter *adap)
871 {
872 mutex_lock(&dvbdev_register_lock);
873 list_del (&adap->list_head);
874 mutex_unlock(&dvbdev_register_lock);
875 return 0;
876 }
877 EXPORT_SYMBOL(dvb_unregister_adapter);
878
879 /* if the miracle happens and "generic_usercopy()" is included into
880 the kernel, then this can vanish. please don't make the mistake and
881 define this as video_usercopy(). this will introduce a dependecy
882 to the v4l "videodev.o" module, which is unnecessary for some
883 cards (ie. the budget dvb-cards don't need the v4l module...) */
884 int dvb_usercopy(struct file *file,
885 unsigned int cmd, unsigned long arg,
886 int (*func)(struct file *file,
887 unsigned int cmd, void *arg))
888 {
889 char sbuf[128];
890 void *mbuf = NULL;
891 void *parg = NULL;
892 int err = -EINVAL;
893
894 /* Copy arguments into temp kernel buffer */
895 switch (_IOC_DIR(cmd)) {
896 case _IOC_NONE:
897 /*
898 * For this command, the pointer is actually an integer
899 * argument.
900 */
901 parg = (void *) arg;
902 break;
903 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
904 case _IOC_WRITE:
905 case (_IOC_WRITE | _IOC_READ):
906 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
907 parg = sbuf;
908 } else {
909 /* too big to allocate from stack */
910 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
911 if (NULL == mbuf)
912 return -ENOMEM;
913 parg = mbuf;
914 }
915
916 err = -EFAULT;
917 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
918 goto out;
919 break;
920 }
921
922 /* call driver */
923 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
924 err = -ENOTTY;
925
926 if (err < 0)
927 goto out;
928
929 /* Copy results into user buffer */
930 switch (_IOC_DIR(cmd))
931 {
932 case _IOC_READ:
933 case (_IOC_WRITE | _IOC_READ):
934 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
935 err = -EFAULT;
936 break;
937 }
938
939 out:
940 kfree(mbuf);
941 return err;
942 }
943
944 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
945 {
946 struct dvb_device *dvbdev = dev_get_drvdata(dev);
947
948 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
949 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
950 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
951 return 0;
952 }
953
954 static char *dvb_devnode(struct device *dev, umode_t *mode)
955 {
956 struct dvb_device *dvbdev = dev_get_drvdata(dev);
957
958 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
959 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
960 }
961
962
963 static int __init init_dvbdev(void)
964 {
965 int retval;
966 dev_t dev = MKDEV(DVB_MAJOR, 0);
967
968 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
969 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
970 return retval;
971 }
972
973 cdev_init(&dvb_device_cdev, &dvb_device_fops);
974 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
975 pr_err("dvb-core: unable register character device\n");
976 goto error;
977 }
978
979 dvb_class = class_create(THIS_MODULE, "dvb");
980 if (IS_ERR(dvb_class)) {
981 retval = PTR_ERR(dvb_class);
982 goto error;
983 }
984 dvb_class->dev_uevent = dvb_uevent;
985 dvb_class->devnode = dvb_devnode;
986 return 0;
987
988 error:
989 cdev_del(&dvb_device_cdev);
990 unregister_chrdev_region(dev, MAX_DVB_MINORS);
991 return retval;
992 }
993
994
995 static void __exit exit_dvbdev(void)
996 {
997 class_destroy(dvb_class);
998 cdev_del(&dvb_device_cdev);
999 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1000 }
1001
1002 subsys_initcall(init_dvbdev);
1003 module_exit(exit_dvbdev);
1004
1005 MODULE_DESCRIPTION("DVB Core Driver");
1006 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1007 MODULE_LICENSE("GPL");
Linux with added FPC-III support