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