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