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