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staging: vboxvideo: Atomic phase 2: Wire up state object handlers
[linux/fpc-iii.git] / drivers / media / dvb-core / dvbdev.c
blob3c87785703310fb97f342b1e42279b33f466b80f
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
39 static DEFINE_MUTEX(dvbdev_mutex);
40 static int dvbdev_debug;
41
42 module_param(dvbdev_debug, int, 0644);
43 MODULE_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
51 static LIST_HEAD(dvb_adapter_list);
52 static DEFINE_MUTEX(dvbdev_register_lock);
53
54 static 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
72 static 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
90 static struct class *dvb_class;
91
92 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
93 static DECLARE_RWSEM(minor_rwsem);
94
95 static 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 }
118 fail:
119 up_read(&minor_rwsem);
120 mutex_unlock(&dvbdev_mutex);
121 return -ENODEV;
122 }
123
124
125 static const struct file_operations dvb_device_fops =
126 {
127 .owner = THIS_MODULE,
128 .open = dvb_device_open,
129 .llseek = noop_llseek,
130 };
131
132 static struct cdev dvb_device_cdev;
133
134 int 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 }
157 EXPORT_SYMBOL(dvb_generic_open);
158
159
160 int 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 }
176 EXPORT_SYMBOL(dvb_generic_release);
177
178
179 long 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 }
192 EXPORT_SYMBOL(dvb_generic_ioctl);
193
194
195 static 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;
205 skip:
206 id++;
207 }
208 return -ENFILE;
209 }
210
211 static 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 dvbdev->adapter->conn = NULL;
245 kfree(dvbdev->adapter->conn_pads);
246 dvbdev->adapter->conn_pads = NULL;
247 }
248 #endif
249 }
250
251 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
252 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
253 const char *name, int npads)
254 {
255 int i, ret = 0;
256
257 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
258 GFP_KERNEL);
259 if (!dvbdev->tsout_pads)
260 return -ENOMEM;
261
262 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
263 GFP_KERNEL);
264 if (!dvbdev->tsout_entity)
265 return -ENOMEM;
266
267 dvbdev->tsout_num_entities = npads;
268
269 for (i = 0; i < npads; i++) {
270 struct media_pad *pads = &dvbdev->tsout_pads[i];
271 struct media_entity *entity = &dvbdev->tsout_entity[i];
272
273 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
274 if (!entity->name)
275 return -ENOMEM;
276
277 entity->function = MEDIA_ENT_F_IO_DTV;
278 pads->flags = MEDIA_PAD_FL_SINK;
279
280 ret = media_entity_pads_init(entity, 1, pads);
281 if (ret < 0)
282 return ret;
283
284 ret = media_device_register_entity(dvbdev->adapter->mdev,
285 entity);
286 if (ret < 0)
287 return ret;
288 }
289 return 0;
290 }
291
292 #define DEMUX_TSOUT "demux-tsout"
293 #define DVR_TSOUT "dvr-tsout"
294
295 static int dvb_create_media_entity(struct dvb_device *dvbdev,
296 int type, int demux_sink_pads)
297 {
298 int i, ret, npads;
299
300 switch (type) {
301 case DVB_DEVICE_FRONTEND:
302 npads = 2;
303 break;
304 case DVB_DEVICE_DVR:
305 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
306 demux_sink_pads);
307 return ret;
308 case DVB_DEVICE_DEMUX:
309 npads = 1 + demux_sink_pads;
310 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
311 demux_sink_pads);
312 if (ret < 0)
313 return ret;
314 break;
315 case DVB_DEVICE_CA:
316 npads = 2;
317 break;
318 case DVB_DEVICE_NET:
319 /*
320 * We should be creating entities for the MPE/ULE
321 * decapsulation hardware (or software implementation).
322 *
323 * However, the number of for the MPE/ULE decaps may not be
324 * fixed. As we don't have yet dynamic support for PADs at
325 * the Media Controller, let's not create the decap
326 * entities yet.
327 */
328 return 0;
329 default:
330 return 0;
331 }
332
333 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
334 if (!dvbdev->entity)
335 return -ENOMEM;
336
337 dvbdev->entity->name = dvbdev->name;
338
339 if (npads) {
340 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
341 GFP_KERNEL);
342 if (!dvbdev->pads)
343 return -ENOMEM;
344 }
345
346 switch (type) {
347 case DVB_DEVICE_FRONTEND:
348 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
349 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
350 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
351 break;
352 case DVB_DEVICE_DEMUX:
353 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
354 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
355 for (i = 1; i < npads; i++)
356 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
357 break;
358 case DVB_DEVICE_CA:
359 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
360 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
361 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
362 break;
363 default:
364 /* Should never happen, as the first switch prevents it */
365 kfree(dvbdev->entity);
366 kfree(dvbdev->pads);
367 dvbdev->entity = NULL;
368 dvbdev->pads = NULL;
369 return 0;
370 }
371
372 if (npads) {
373 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
374 if (ret)
375 return ret;
376 }
377 ret = media_device_register_entity(dvbdev->adapter->mdev,
378 dvbdev->entity);
379 if (ret)
380 return ret;
381
382 pr_info("%s: media entity '%s' registered.\n",
383 __func__, dvbdev->entity->name);
384
385 return 0;
386 }
387 #endif
388
389 static int dvb_register_media_device(struct dvb_device *dvbdev,
390 int type, int minor,
391 unsigned demux_sink_pads)
392 {
393 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
394 struct media_link *link;
395 u32 intf_type;
396 int ret;
397
398 if (!dvbdev->adapter->mdev)
399 return 0;
400
401 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
402 if (ret)
403 return ret;
404
405 switch (type) {
406 case DVB_DEVICE_FRONTEND:
407 intf_type = MEDIA_INTF_T_DVB_FE;
408 break;
409 case DVB_DEVICE_DEMUX:
410 intf_type = MEDIA_INTF_T_DVB_DEMUX;
411 break;
412 case DVB_DEVICE_DVR:
413 intf_type = MEDIA_INTF_T_DVB_DVR;
414 break;
415 case DVB_DEVICE_CA:
416 intf_type = MEDIA_INTF_T_DVB_CA;
417 break;
418 case DVB_DEVICE_NET:
419 intf_type = MEDIA_INTF_T_DVB_NET;
420 break;
421 default:
422 return 0;
423 }
424
425 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
426 intf_type, 0,
427 DVB_MAJOR, minor);
428
429 if (!dvbdev->intf_devnode)
430 return -ENOMEM;
431
432 /*
433 * Create the "obvious" link, e. g. the ones that represent
434 * a direct association between an interface and an entity.
435 * Other links should be created elsewhere, like:
436 * DVB FE intf -> tuner
437 * DVB demux intf -> dvr
438 */
439
440 if (!dvbdev->entity)
441 return 0;
442
443 link = media_create_intf_link(dvbdev->entity,
444 &dvbdev->intf_devnode->intf,
445 MEDIA_LNK_FL_ENABLED |
446 MEDIA_LNK_FL_IMMUTABLE);
447 if (!link)
448 return -ENOMEM;
449 #endif
450 return 0;
451 }
452
453 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
454 const struct dvb_device *template, void *priv,
455 enum dvb_device_type type, int demux_sink_pads)
456 {
457 struct dvb_device *dvbdev;
458 struct file_operations *dvbdevfops;
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
474 if (!dvbdev){
475 mutex_unlock(&dvbdev_register_lock);
476 return -ENOMEM;
477 }
478
479 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
480
481 if (!dvbdevfops){
482 kfree (dvbdev);
483 mutex_unlock(&dvbdev_register_lock);
484 return -ENOMEM;
485 }
486
487 memcpy(dvbdev, template, sizeof(struct dvb_device));
488 dvbdev->type = type;
489 dvbdev->id = id;
490 dvbdev->adapter = adap;
491 dvbdev->priv = priv;
492 dvbdev->fops = dvbdevfops;
493 init_waitqueue_head (&dvbdev->wait_queue);
494
495 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
496 dvbdevfops->owner = adap->module;
497
498 list_add_tail (&dvbdev->list_head, &adap->device_list);
499
500 down_write(&minor_rwsem);
501 #ifdef CONFIG_DVB_DYNAMIC_MINORS
502 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
503 if (dvb_minors[minor] == NULL)
504 break;
505
506 if (minor == MAX_DVB_MINORS) {
507 kfree(dvbdevfops);
508 kfree(dvbdev);
509 up_write(&minor_rwsem);
510 mutex_unlock(&dvbdev_register_lock);
511 return -EINVAL;
512 }
513 #else
514 minor = nums2minor(adap->num, type, id);
515 #endif
516
517 dvbdev->minor = minor;
518 dvb_minors[minor] = dvbdev;
519 up_write(&minor_rwsem);
520
521 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
522 if (ret) {
523 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
524 __func__);
525
526 dvb_media_device_free(dvbdev);
527 kfree(dvbdevfops);
528 kfree(dvbdev);
529 up_write(&minor_rwsem);
530 mutex_unlock(&dvbdev_register_lock);
531 return ret;
532 }
533
534 mutex_unlock(&dvbdev_register_lock);
535
536 clsdev = device_create(dvb_class, adap->device,
537 MKDEV(DVB_MAJOR, minor),
538 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
539 if (IS_ERR(clsdev)) {
540 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
541 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
542 return PTR_ERR(clsdev);
543 }
544 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
545 adap->num, dnames[type], id, minor, minor);
546
547 return 0;
548 }
549 EXPORT_SYMBOL(dvb_register_device);
550
551
552 void dvb_remove_device(struct dvb_device *dvbdev)
553 {
554 if (!dvbdev)
555 return;
556
557 down_write(&minor_rwsem);
558 dvb_minors[dvbdev->minor] = NULL;
559 up_write(&minor_rwsem);
560
561 dvb_media_device_free(dvbdev);
562
563 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
564
565 list_del (&dvbdev->list_head);
566 }
567 EXPORT_SYMBOL(dvb_remove_device);
568
569
570 void dvb_free_device(struct dvb_device *dvbdev)
571 {
572 if (!dvbdev)
573 return;
574
575 kfree (dvbdev->fops);
576 kfree (dvbdev);
577 }
578 EXPORT_SYMBOL(dvb_free_device);
579
580
581 void dvb_unregister_device(struct dvb_device *dvbdev)
582 {
583 dvb_remove_device(dvbdev);
584 dvb_free_device(dvbdev);
585 }
586 EXPORT_SYMBOL(dvb_unregister_device);
587
588
589 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
590
591 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
592 struct media_interface *intf,
593 char *name)
594 {
595 struct media_device *mdev = adap->mdev;
596 struct media_entity *entity;
597 struct media_link *link;
598
599 media_device_for_each_entity(entity, mdev) {
600 if (entity->function == MEDIA_ENT_F_IO_DTV) {
601 if (strncmp(entity->name, name, strlen(name)))
602 continue;
603 link = media_create_intf_link(entity, intf,
604 MEDIA_LNK_FL_ENABLED |
605 MEDIA_LNK_FL_IMMUTABLE);
606 if (!link)
607 return -ENOMEM;
608 }
609 }
610 return 0;
611 }
612
613 int dvb_create_media_graph(struct dvb_adapter *adap,
614 bool create_rf_connector)
615 {
616 struct media_device *mdev = adap->mdev;
617 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
618 struct media_entity *demux = NULL, *ca = NULL;
619 struct media_link *link;
620 struct media_interface *intf;
621 unsigned demux_pad = 0;
622 unsigned dvr_pad = 0;
623 unsigned ntuner = 0, ndemod = 0;
624 int ret;
625 static const char *connector_name = "Television";
626
627 if (!mdev)
628 return 0;
629
630 media_device_for_each_entity(entity, mdev) {
631 switch (entity->function) {
632 case MEDIA_ENT_F_TUNER:
633 tuner = entity;
634 ntuner++;
635 break;
636 case MEDIA_ENT_F_DTV_DEMOD:
637 demod = entity;
638 ndemod++;
639 break;
640 case MEDIA_ENT_F_TS_DEMUX:
641 demux = entity;
642 break;
643 case MEDIA_ENT_F_DTV_CA:
644 ca = entity;
645 break;
646 }
647 }
648
649 /*
650 * Prepare to signalize to media_create_pad_links() that multiple
651 * entities of the same type exists and a 1:n or n:1 links need to be
652 * created.
653 * NOTE: if both tuner and demod have multiple instances, it is up
654 * to the caller driver to create such links.
655 */
656 if (ntuner > 1)
657 tuner = NULL;
658 if (ndemod > 1)
659 demod = NULL;
660
661 if (create_rf_connector) {
662 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
663 if (!conn)
664 return -ENOMEM;
665 adap->conn = conn;
666
667 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
668 if (!adap->conn_pads)
669 return -ENOMEM;
670
671 conn->flags = MEDIA_ENT_FL_CONNECTOR;
672 conn->function = MEDIA_ENT_F_CONN_RF;
673 conn->name = connector_name;
674 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
675
676 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
677 if (ret)
678 return ret;
679
680 ret = media_device_register_entity(mdev, conn);
681 if (ret)
682 return ret;
683
684 if (!ntuner)
685 ret = media_create_pad_links(mdev,
686 MEDIA_ENT_F_CONN_RF,
687 conn, 0,
688 MEDIA_ENT_F_DTV_DEMOD,
689 demod, 0,
690 MEDIA_LNK_FL_ENABLED,
691 false);
692 else
693 ret = media_create_pad_links(mdev,
694 MEDIA_ENT_F_CONN_RF,
695 conn, 0,
696 MEDIA_ENT_F_TUNER,
697 tuner, TUNER_PAD_RF_INPUT,
698 MEDIA_LNK_FL_ENABLED,
699 false);
700 if (ret)
701 return ret;
702 }
703
704 if (ntuner && ndemod) {
705 ret = media_create_pad_links(mdev,
706 MEDIA_ENT_F_TUNER,
707 tuner, TUNER_PAD_OUTPUT,
708 MEDIA_ENT_F_DTV_DEMOD,
709 demod, 0, MEDIA_LNK_FL_ENABLED,
710 false);
711 if (ret)
712 return ret;
713 }
714
715 if (ndemod && demux) {
716 ret = media_create_pad_links(mdev,
717 MEDIA_ENT_F_DTV_DEMOD,
718 demod, 1,
719 MEDIA_ENT_F_TS_DEMUX,
720 demux, 0, MEDIA_LNK_FL_ENABLED,
721 false);
722 if (ret)
723 return ret;
724 }
725 if (demux && ca) {
726 ret = media_create_pad_link(demux, 1, ca,
727 0, MEDIA_LNK_FL_ENABLED);
728 if (ret)
729 return ret;
730 }
731
732 /* Create demux links for each ringbuffer/pad */
733 if (demux) {
734 media_device_for_each_entity(entity, mdev) {
735 if (entity->function == MEDIA_ENT_F_IO_DTV) {
736 if (!strncmp(entity->name, DVR_TSOUT,
737 strlen(DVR_TSOUT))) {
738 ret = media_create_pad_link(demux,
739 ++dvr_pad,
740 entity, 0, 0);
741 if (ret)
742 return ret;
743 }
744 if (!strncmp(entity->name, DEMUX_TSOUT,
745 strlen(DEMUX_TSOUT))) {
746 ret = media_create_pad_link(demux,
747 ++demux_pad,
748 entity, 0, 0);
749 if (ret)
750 return ret;
751 }
752 }
753 }
754 }
755
756 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
757 media_device_for_each_intf(intf, mdev) {
758 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
759 link = media_create_intf_link(ca, intf,
760 MEDIA_LNK_FL_ENABLED |
761 MEDIA_LNK_FL_IMMUTABLE);
762 if (!link)
763 return -ENOMEM;
764 }
765
766 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
767 link = media_create_intf_link(tuner, intf,
768 MEDIA_LNK_FL_ENABLED |
769 MEDIA_LNK_FL_IMMUTABLE);
770 if (!link)
771 return -ENOMEM;
772 }
773 #if 0
774 /*
775 * Indirect link - let's not create yet, as we don't know how
776 * to handle indirect links, nor if this will
777 * actually be needed.
778 */
779 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
780 link = media_create_intf_link(demux, intf,
781 MEDIA_LNK_FL_ENABLED |
782 MEDIA_LNK_FL_IMMUTABLE);
783 if (!link)
784 return -ENOMEM;
785 }
786 #endif
787 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
788 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
789 if (ret)
790 return ret;
791 }
792 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
793 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
794 if (ret)
795 return ret;
796 }
797 }
798 return 0;
799 }
800 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
801 #endif
802
803 static int dvbdev_check_free_adapter_num(int num)
804 {
805 struct list_head *entry;
806 list_for_each(entry, &dvb_adapter_list) {
807 struct dvb_adapter *adap;
808 adap = list_entry(entry, struct dvb_adapter, list_head);
809 if (adap->num == num)
810 return 0;
811 }
812 return 1;
813 }
814
815 static int dvbdev_get_free_adapter_num (void)
816 {
817 int num = 0;
818
819 while (num < DVB_MAX_ADAPTERS) {
820 if (dvbdev_check_free_adapter_num(num))
821 return num;
822 num++;
823 }
824
825 return -ENFILE;
826 }
827
828
829 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
830 struct module *module, struct device *device,
831 short *adapter_nums)
832 {
833 int i, num;
834
835 mutex_lock(&dvbdev_register_lock);
836
837 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
838 num = adapter_nums[i];
839 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
840 /* use the one the driver asked for */
841 if (dvbdev_check_free_adapter_num(num))
842 break;
843 } else {
844 num = dvbdev_get_free_adapter_num();
845 break;
846 }
847 num = -1;
848 }
849
850 if (num < 0) {
851 mutex_unlock(&dvbdev_register_lock);
852 return -ENFILE;
853 }
854
855 memset (adap, 0, sizeof(struct dvb_adapter));
856 INIT_LIST_HEAD (&adap->device_list);
857
858 pr_info("DVB: registering new adapter (%s)\n", name);
859
860 adap->num = num;
861 adap->name = name;
862 adap->module = module;
863 adap->device = device;
864 adap->mfe_shared = 0;
865 adap->mfe_dvbdev = NULL;
866 mutex_init (&adap->mfe_lock);
867
868 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
869 mutex_init(&adap->mdev_lock);
870 #endif
871
872 list_add_tail (&adap->list_head, &dvb_adapter_list);
873
874 mutex_unlock(&dvbdev_register_lock);
875
876 return num;
877 }
878 EXPORT_SYMBOL(dvb_register_adapter);
879
880
881 int dvb_unregister_adapter(struct dvb_adapter *adap)
882 {
883 mutex_lock(&dvbdev_register_lock);
884 list_del (&adap->list_head);
885 mutex_unlock(&dvbdev_register_lock);
886 return 0;
887 }
888 EXPORT_SYMBOL(dvb_unregister_adapter);
889
890 /* if the miracle happens and "generic_usercopy()" is included into
891 the kernel, then this can vanish. please don't make the mistake and
892 define this as video_usercopy(). this will introduce a dependecy
893 to the v4l "videodev.o" module, which is unnecessary for some
894 cards (ie. the budget dvb-cards don't need the v4l module...) */
895 int dvb_usercopy(struct file *file,
896 unsigned int cmd, unsigned long arg,
897 int (*func)(struct file *file,
898 unsigned int cmd, void *arg))
899 {
900 char sbuf[128];
901 void *mbuf = NULL;
902 void *parg = NULL;
903 int err = -EINVAL;
904
905 /* Copy arguments into temp kernel buffer */
906 switch (_IOC_DIR(cmd)) {
907 case _IOC_NONE:
908 /*
909 * For this command, the pointer is actually an integer
910 * argument.
911 */
912 parg = (void *) arg;
913 break;
914 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
915 case _IOC_WRITE:
916 case (_IOC_WRITE | _IOC_READ):
917 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
918 parg = sbuf;
919 } else {
920 /* too big to allocate from stack */
921 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
922 if (NULL == mbuf)
923 return -ENOMEM;
924 parg = mbuf;
925 }
926
927 err = -EFAULT;
928 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
929 goto out;
930 break;
931 }
932
933 /* call driver */
934 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
935 err = -ENOTTY;
936
937 if (err < 0)
938 goto out;
939
940 /* Copy results into user buffer */
941 switch (_IOC_DIR(cmd))
942 {
943 case _IOC_READ:
944 case (_IOC_WRITE | _IOC_READ):
945 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
946 err = -EFAULT;
947 break;
948 }
949
950 out:
951 kfree(mbuf);
952 return err;
953 }
954
955 #if IS_ENABLED(CONFIG_I2C)
956 struct i2c_client *dvb_module_probe(const char *module_name,
957 const char *name,
958 struct i2c_adapter *adap,
959 unsigned char addr,
960 void *platform_data)
961 {
962 struct i2c_client *client;
963 struct i2c_board_info *board_info;
964
965 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
966 if (!board_info)
967 return NULL;
968
969 if (name)
970 strlcpy(board_info->type, name, I2C_NAME_SIZE);
971 else
972 strlcpy(board_info->type, module_name, I2C_NAME_SIZE);
973
974 board_info->addr = addr;
975 board_info->platform_data = platform_data;
976 request_module(module_name);
977 client = i2c_new_device(adap, board_info);
978 if (client == NULL || client->dev.driver == NULL) {
979 kfree(board_info);
980 return NULL;
981 }
982
983 if (!try_module_get(client->dev.driver->owner)) {
984 i2c_unregister_device(client);
985 client = NULL;
986 }
987
988 kfree(board_info);
989 return client;
990 }
991 EXPORT_SYMBOL_GPL(dvb_module_probe);
992
993 void dvb_module_release(struct i2c_client *client)
994 {
995 if (!client)
996 return;
997
998 module_put(client->dev.driver->owner);
999 i2c_unregister_device(client);
1000 }
1001 EXPORT_SYMBOL_GPL(dvb_module_release);
1002 #endif
1003
1004 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1005 {
1006 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1007
1008 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1009 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1010 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1011 return 0;
1012 }
1013
1014 static char *dvb_devnode(struct device *dev, umode_t *mode)
1015 {
1016 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1017
1018 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1019 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1020 }
1021
1022
1023 static int __init init_dvbdev(void)
1024 {
1025 int retval;
1026 dev_t dev = MKDEV(DVB_MAJOR, 0);
1027
1028 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1029 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1030 return retval;
1031 }
1032
1033 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1034 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1035 pr_err("dvb-core: unable register character device\n");
1036 goto error;
1037 }
1038
1039 dvb_class = class_create(THIS_MODULE, "dvb");
1040 if (IS_ERR(dvb_class)) {
1041 retval = PTR_ERR(dvb_class);
1042 goto error;
1043 }
1044 dvb_class->dev_uevent = dvb_uevent;
1045 dvb_class->devnode = dvb_devnode;
1046 return 0;
1047
1048 error:
1049 cdev_del(&dvb_device_cdev);
1050 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1051 return retval;
1052 }
1053
1054
1055 static void __exit exit_dvbdev(void)
1056 {
1057 class_destroy(dvb_class);
1058 cdev_del(&dvb_device_cdev);
1059 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1060 }
1061
1062 subsys_initcall(init_dvbdev);
1063 module_exit(exit_dvbdev);
1064
1065 MODULE_DESCRIPTION("DVB Core Driver");
1066 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1067 MODULE_LICENSE("GPL");
Linux with added FPC-III support