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
dvb_device_open(struct inode * inode,struct file * file)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 = dvb_device_get(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
dvb_generic_open(struct inode * inode,struct file * file)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
dvb_generic_release(struct inode * inode,struct file * file)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
175 dvb_device_put(dvbdev);
176
177 return 0;
178 }
179 EXPORT_SYMBOL(dvb_generic_release);
180
181
dvb_generic_ioctl(struct file * file,unsigned int cmd,unsigned long arg)182 long dvb_generic_ioctl(struct file *file,
183 unsigned int cmd, unsigned long arg)
184 {
185 struct dvb_device *dvbdev = file->private_data;
186
187 if (!dvbdev)
188 return -ENODEV;
189
190 if (!dvbdev->kernel_ioctl)
191 return -EINVAL;
192
193 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
194 }
195 EXPORT_SYMBOL(dvb_generic_ioctl);
196
197
dvbdev_get_free_id(struct dvb_adapter * adap,int type)198 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
199 {
200 u32 id = 0;
201
202 while (id < DVB_MAX_IDS) {
203 struct dvb_device *dev;
204 list_for_each_entry(dev, &adap->device_list, list_head)
205 if (dev->type == type && dev->id == id)
206 goto skip;
207 return id;
208 skip:
209 id++;
210 }
211 return -ENFILE;
212 }
213
dvb_media_device_free(struct dvb_device * dvbdev)214 static void dvb_media_device_free(struct dvb_device *dvbdev)
215 {
216 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
217 if (dvbdev->entity) {
218 media_device_unregister_entity(dvbdev->entity);
219 kfree(dvbdev->entity);
220 kfree(dvbdev->pads);
221 dvbdev->entity = NULL;
222 dvbdev->pads = NULL;
223 }
224
225 if (dvbdev->tsout_entity) {
226 int i;
227
228 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
229 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
230 kfree(dvbdev->tsout_entity[i].name);
231 }
232 kfree(dvbdev->tsout_entity);
233 kfree(dvbdev->tsout_pads);
234 dvbdev->tsout_entity = NULL;
235 dvbdev->tsout_pads = NULL;
236
237 dvbdev->tsout_num_entities = 0;
238 }
239
240 if (dvbdev->intf_devnode) {
241 media_devnode_remove(dvbdev->intf_devnode);
242 dvbdev->intf_devnode = NULL;
243 }
244
245 if (dvbdev->adapter->conn) {
246 media_device_unregister_entity(dvbdev->adapter->conn);
247 kfree(dvbdev->adapter->conn);
248 dvbdev->adapter->conn = NULL;
249 kfree(dvbdev->adapter->conn_pads);
250 dvbdev->adapter->conn_pads = NULL;
251 }
252 #endif
253 }
254
255 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
dvb_create_tsout_entity(struct dvb_device * dvbdev,const char * name,int npads)256 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
257 const char *name, int npads)
258 {
259 int i, ret = 0;
260
261 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
262 GFP_KERNEL);
263 if (!dvbdev->tsout_pads)
264 return -ENOMEM;
265
266 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
267 GFP_KERNEL);
268 if (!dvbdev->tsout_entity)
269 return -ENOMEM;
270
271 dvbdev->tsout_num_entities = npads;
272
273 for (i = 0; i < npads; i++) {
274 struct media_pad *pads = &dvbdev->tsout_pads[i];
275 struct media_entity *entity = &dvbdev->tsout_entity[i];
276
277 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
278 if (!entity->name)
279 return -ENOMEM;
280
281 entity->function = MEDIA_ENT_F_IO_DTV;
282 pads->flags = MEDIA_PAD_FL_SINK;
283
284 ret = media_entity_pads_init(entity, 1, pads);
285 if (ret < 0)
286 return ret;
287
288 ret = media_device_register_entity(dvbdev->adapter->mdev,
289 entity);
290 if (ret < 0)
291 return ret;
292 }
293 return 0;
294 }
295
296 #define DEMUX_TSOUT "demux-tsout"
297 #define DVR_TSOUT "dvr-tsout"
298
dvb_create_media_entity(struct dvb_device * dvbdev,int type,int demux_sink_pads)299 static int dvb_create_media_entity(struct dvb_device *dvbdev,
300 int type, int demux_sink_pads)
301 {
302 int i, ret, npads;
303
304 switch (type) {
305 case DVB_DEVICE_FRONTEND:
306 npads = 2;
307 break;
308 case DVB_DEVICE_DVR:
309 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
310 demux_sink_pads);
311 return ret;
312 case DVB_DEVICE_DEMUX:
313 npads = 1 + demux_sink_pads;
314 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
315 demux_sink_pads);
316 if (ret < 0)
317 return ret;
318 break;
319 case DVB_DEVICE_CA:
320 npads = 2;
321 break;
322 case DVB_DEVICE_NET:
323 /*
324 * We should be creating entities for the MPE/ULE
325 * decapsulation hardware (or software implementation).
326 *
327 * However, the number of for the MPE/ULE decaps may not be
328 * fixed. As we don't have yet dynamic support for PADs at
329 * the Media Controller, let's not create the decap
330 * entities yet.
331 */
332 return 0;
333 default:
334 return 0;
335 }
336
337 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
338 if (!dvbdev->entity)
339 return -ENOMEM;
340
341 dvbdev->entity->name = dvbdev->name;
342
343 if (npads) {
344 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
345 GFP_KERNEL);
346 if (!dvbdev->pads) {
347 kfree(dvbdev->entity);
348 dvbdev->entity = NULL;
349 return -ENOMEM;
350 }
351 }
352
353 switch (type) {
354 case DVB_DEVICE_FRONTEND:
355 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
356 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
357 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
358 break;
359 case DVB_DEVICE_DEMUX:
360 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
361 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
362 for (i = 1; i < npads; i++)
363 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
364 break;
365 case DVB_DEVICE_CA:
366 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
367 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
368 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
369 break;
370 default:
371 /* Should never happen, as the first switch prevents it */
372 kfree(dvbdev->entity);
373 kfree(dvbdev->pads);
374 dvbdev->entity = NULL;
375 dvbdev->pads = NULL;
376 return 0;
377 }
378
379 if (npads) {
380 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
381 if (ret)
382 return ret;
383 }
384 ret = media_device_register_entity(dvbdev->adapter->mdev,
385 dvbdev->entity);
386 if (ret)
387 return ret;
388
389 pr_info("%s: media entity '%s' registered.\n",
390 __func__, dvbdev->entity->name);
391
392 return 0;
393 }
394 #endif
395
dvb_register_media_device(struct dvb_device * dvbdev,int type,int minor,unsigned demux_sink_pads)396 static int dvb_register_media_device(struct dvb_device *dvbdev,
397 int type, int minor,
398 unsigned demux_sink_pads)
399 {
400 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
401 struct media_link *link;
402 u32 intf_type;
403 int ret;
404
405 if (!dvbdev->adapter->mdev)
406 return 0;
407
408 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
409 if (ret)
410 return ret;
411
412 switch (type) {
413 case DVB_DEVICE_FRONTEND:
414 intf_type = MEDIA_INTF_T_DVB_FE;
415 break;
416 case DVB_DEVICE_DEMUX:
417 intf_type = MEDIA_INTF_T_DVB_DEMUX;
418 break;
419 case DVB_DEVICE_DVR:
420 intf_type = MEDIA_INTF_T_DVB_DVR;
421 break;
422 case DVB_DEVICE_CA:
423 intf_type = MEDIA_INTF_T_DVB_CA;
424 break;
425 case DVB_DEVICE_NET:
426 intf_type = MEDIA_INTF_T_DVB_NET;
427 break;
428 default:
429 return 0;
430 }
431
432 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
433 intf_type, 0,
434 DVB_MAJOR, minor);
435
436 if (!dvbdev->intf_devnode)
437 return -ENOMEM;
438
439 /*
440 * Create the "obvious" link, e. g. the ones that represent
441 * a direct association between an interface and an entity.
442 * Other links should be created elsewhere, like:
443 * DVB FE intf -> tuner
444 * DVB demux intf -> dvr
445 */
446
447 if (!dvbdev->entity)
448 return 0;
449
450 link = media_create_intf_link(dvbdev->entity,
451 &dvbdev->intf_devnode->intf,
452 MEDIA_LNK_FL_ENABLED |
453 MEDIA_LNK_FL_IMMUTABLE);
454 if (!link)
455 return -ENOMEM;
456 #endif
457 return 0;
458 }
459
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)460 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
461 const struct dvb_device *template, void *priv,
462 enum dvb_device_type type, int demux_sink_pads)
463 {
464 struct dvb_device *dvbdev;
465 struct file_operations *dvbdevfops;
466 struct device *clsdev;
467 int minor;
468 int id, ret;
469
470 mutex_lock(&dvbdev_register_lock);
471
472 if ((id = dvbdev_get_free_id (adap, type)) < 0){
473 mutex_unlock(&dvbdev_register_lock);
474 *pdvbdev = NULL;
475 pr_err("%s: couldn't find free device id\n", __func__);
476 return -ENFILE;
477 }
478
479 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
480
481 if (!dvbdev){
482 mutex_unlock(&dvbdev_register_lock);
483 return -ENOMEM;
484 }
485
486 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
487
488 if (!dvbdevfops){
489 kfree (dvbdev);
490 mutex_unlock(&dvbdev_register_lock);
491 return -ENOMEM;
492 }
493
494 memcpy(dvbdev, template, sizeof(struct dvb_device));
495 kref_init(&dvbdev->ref);
496 dvbdev->type = type;
497 dvbdev->id = id;
498 dvbdev->adapter = adap;
499 dvbdev->priv = priv;
500 dvbdev->fops = dvbdevfops;
501 init_waitqueue_head (&dvbdev->wait_queue);
502
503 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
504 dvbdevfops->owner = adap->module;
505
506 list_add_tail (&dvbdev->list_head, &adap->device_list);
507
508 down_write(&minor_rwsem);
509 #ifdef CONFIG_DVB_DYNAMIC_MINORS
510 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
511 if (dvb_minors[minor] == NULL)
512 break;
513
514 if (minor == MAX_DVB_MINORS) {
515 kfree(dvbdevfops);
516 kfree(dvbdev);
517 up_write(&minor_rwsem);
518 mutex_unlock(&dvbdev_register_lock);
519 return -EINVAL;
520 }
521 #else
522 minor = nums2minor(adap->num, type, id);
523 #endif
524
525 dvbdev->minor = minor;
526 dvb_minors[minor] = dvb_device_get(dvbdev);
527 up_write(&minor_rwsem);
528
529 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
530 if (ret) {
531 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
532 __func__);
533
534 dvb_media_device_free(dvbdev);
535 kfree(dvbdevfops);
536 kfree(dvbdev);
537 up_write(&minor_rwsem);
538 mutex_unlock(&dvbdev_register_lock);
539 return ret;
540 }
541
542 mutex_unlock(&dvbdev_register_lock);
543
544 clsdev = device_create(dvb_class, adap->device,
545 MKDEV(DVB_MAJOR, minor),
546 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
547 if (IS_ERR(clsdev)) {
548 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
549 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
550 return PTR_ERR(clsdev);
551 }
552 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
553 adap->num, dnames[type], id, minor, minor);
554
555 return 0;
556 }
557 EXPORT_SYMBOL(dvb_register_device);
558
559
dvb_remove_device(struct dvb_device * dvbdev)560 void dvb_remove_device(struct dvb_device *dvbdev)
561 {
562 if (!dvbdev)
563 return;
564
565 down_write(&minor_rwsem);
566 dvb_minors[dvbdev->minor] = NULL;
567 dvb_device_put(dvbdev);
568 up_write(&minor_rwsem);
569
570 dvb_media_device_free(dvbdev);
571
572 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
573
574 list_del (&dvbdev->list_head);
575 }
576 EXPORT_SYMBOL(dvb_remove_device);
577
578
dvb_free_device(struct kref * ref)579 static void dvb_free_device(struct kref *ref)
580 {
581 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
582
583 kfree (dvbdev->fops);
584 kfree (dvbdev);
585 }
586
587
dvb_device_get(struct dvb_device * dvbdev)588 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
589 {
590 kref_get(&dvbdev->ref);
591 return dvbdev;
592 }
593 EXPORT_SYMBOL(dvb_device_get);
594
595
dvb_device_put(struct dvb_device * dvbdev)596 void dvb_device_put(struct dvb_device *dvbdev)
597 {
598 if (dvbdev)
599 kref_put(&dvbdev->ref, dvb_free_device);
600 }
601
602
dvb_unregister_device(struct dvb_device * dvbdev)603 void dvb_unregister_device(struct dvb_device *dvbdev)
604 {
605 dvb_remove_device(dvbdev);
606 dvb_device_put(dvbdev);
607 }
608 EXPORT_SYMBOL(dvb_unregister_device);
609
610
611 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
612
dvb_create_io_intf_links(struct dvb_adapter * adap,struct media_interface * intf,char * name)613 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
614 struct media_interface *intf,
615 char *name)
616 {
617 struct media_device *mdev = adap->mdev;
618 struct media_entity *entity;
619 struct media_link *link;
620
621 media_device_for_each_entity(entity, mdev) {
622 if (entity->function == MEDIA_ENT_F_IO_DTV) {
623 if (strncmp(entity->name, name, strlen(name)))
624 continue;
625 link = media_create_intf_link(entity, intf,
626 MEDIA_LNK_FL_ENABLED |
627 MEDIA_LNK_FL_IMMUTABLE);
628 if (!link)
629 return -ENOMEM;
630 }
631 }
632 return 0;
633 }
634
dvb_create_media_graph(struct dvb_adapter * adap,bool create_rf_connector)635 int dvb_create_media_graph(struct dvb_adapter *adap,
636 bool create_rf_connector)
637 {
638 struct media_device *mdev = adap->mdev;
639 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
640 struct media_entity *demux = NULL, *ca = NULL;
641 struct media_link *link;
642 struct media_interface *intf;
643 unsigned demux_pad = 0;
644 unsigned dvr_pad = 0;
645 unsigned ntuner = 0, ndemod = 0;
646 int ret;
647 static const char *connector_name = "Television";
648
649 if (!mdev)
650 return 0;
651
652 media_device_for_each_entity(entity, mdev) {
653 switch (entity->function) {
654 case MEDIA_ENT_F_TUNER:
655 tuner = entity;
656 ntuner++;
657 break;
658 case MEDIA_ENT_F_DTV_DEMOD:
659 demod = entity;
660 ndemod++;
661 break;
662 case MEDIA_ENT_F_TS_DEMUX:
663 demux = entity;
664 break;
665 case MEDIA_ENT_F_DTV_CA:
666 ca = entity;
667 break;
668 }
669 }
670
671 /*
672 * Prepare to signalize to media_create_pad_links() that multiple
673 * entities of the same type exists and a 1:n or n:1 links need to be
674 * created.
675 * NOTE: if both tuner and demod have multiple instances, it is up
676 * to the caller driver to create such links.
677 */
678 if (ntuner > 1)
679 tuner = NULL;
680 if (ndemod > 1)
681 demod = NULL;
682
683 if (create_rf_connector) {
684 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
685 if (!conn)
686 return -ENOMEM;
687 adap->conn = conn;
688
689 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
690 if (!adap->conn_pads)
691 return -ENOMEM;
692
693 conn->flags = MEDIA_ENT_FL_CONNECTOR;
694 conn->function = MEDIA_ENT_F_CONN_RF;
695 conn->name = connector_name;
696 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
697
698 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
699 if (ret)
700 return ret;
701
702 ret = media_device_register_entity(mdev, conn);
703 if (ret)
704 return ret;
705
706 if (!ntuner)
707 ret = media_create_pad_links(mdev,
708 MEDIA_ENT_F_CONN_RF,
709 conn, 0,
710 MEDIA_ENT_F_DTV_DEMOD,
711 demod, 0,
712 MEDIA_LNK_FL_ENABLED,
713 false);
714 else
715 ret = media_create_pad_links(mdev,
716 MEDIA_ENT_F_CONN_RF,
717 conn, 0,
718 MEDIA_ENT_F_TUNER,
719 tuner, TUNER_PAD_RF_INPUT,
720 MEDIA_LNK_FL_ENABLED,
721 false);
722 if (ret)
723 return ret;
724 }
725
726 if (ntuner && ndemod) {
727 ret = media_create_pad_links(mdev,
728 MEDIA_ENT_F_TUNER,
729 tuner, TUNER_PAD_OUTPUT,
730 MEDIA_ENT_F_DTV_DEMOD,
731 demod, 0, MEDIA_LNK_FL_ENABLED,
732 false);
733 if (ret)
734 return ret;
735 }
736
737 if (ndemod && demux) {
738 ret = media_create_pad_links(mdev,
739 MEDIA_ENT_F_DTV_DEMOD,
740 demod, 1,
741 MEDIA_ENT_F_TS_DEMUX,
742 demux, 0, MEDIA_LNK_FL_ENABLED,
743 false);
744 if (ret)
745 return ret;
746 }
747 if (demux && ca) {
748 ret = media_create_pad_link(demux, 1, ca,
749 0, MEDIA_LNK_FL_ENABLED);
750 if (ret)
751 return ret;
752 }
753
754 /* Create demux links for each ringbuffer/pad */
755 if (demux) {
756 media_device_for_each_entity(entity, mdev) {
757 if (entity->function == MEDIA_ENT_F_IO_DTV) {
758 if (!strncmp(entity->name, DVR_TSOUT,
759 strlen(DVR_TSOUT))) {
760 ret = media_create_pad_link(demux,
761 ++dvr_pad,
762 entity, 0, 0);
763 if (ret)
764 return ret;
765 }
766 if (!strncmp(entity->name, DEMUX_TSOUT,
767 strlen(DEMUX_TSOUT))) {
768 ret = media_create_pad_link(demux,
769 ++demux_pad,
770 entity, 0, 0);
771 if (ret)
772 return ret;
773 }
774 }
775 }
776 }
777
778 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
779 media_device_for_each_intf(intf, mdev) {
780 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
781 link = media_create_intf_link(ca, intf,
782 MEDIA_LNK_FL_ENABLED |
783 MEDIA_LNK_FL_IMMUTABLE);
784 if (!link)
785 return -ENOMEM;
786 }
787
788 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
789 link = media_create_intf_link(tuner, intf,
790 MEDIA_LNK_FL_ENABLED |
791 MEDIA_LNK_FL_IMMUTABLE);
792 if (!link)
793 return -ENOMEM;
794 }
795 #if 0
796 /*
797 * Indirect link - let's not create yet, as we don't know how
798 * to handle indirect links, nor if this will
799 * actually be needed.
800 */
801 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
802 link = media_create_intf_link(demux, intf,
803 MEDIA_LNK_FL_ENABLED |
804 MEDIA_LNK_FL_IMMUTABLE);
805 if (!link)
806 return -ENOMEM;
807 }
808 #endif
809 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
810 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
811 if (ret)
812 return ret;
813 }
814 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
815 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
816 if (ret)
817 return ret;
818 }
819 }
820 return 0;
821 }
822 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
823 #endif
824
dvbdev_check_free_adapter_num(int num)825 static int dvbdev_check_free_adapter_num(int num)
826 {
827 struct list_head *entry;
828 list_for_each(entry, &dvb_adapter_list) {
829 struct dvb_adapter *adap;
830 adap = list_entry(entry, struct dvb_adapter, list_head);
831 if (adap->num == num)
832 return 0;
833 }
834 return 1;
835 }
836
dvbdev_get_free_adapter_num(void)837 static int dvbdev_get_free_adapter_num (void)
838 {
839 int num = 0;
840
841 while (num < DVB_MAX_ADAPTERS) {
842 if (dvbdev_check_free_adapter_num(num))
843 return num;
844 num++;
845 }
846
847 return -ENFILE;
848 }
849
850
dvb_register_adapter(struct dvb_adapter * adap,const char * name,struct module * module,struct device * device,short * adapter_nums)851 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
852 struct module *module, struct device *device,
853 short *adapter_nums)
854 {
855 int i, num;
856
857 mutex_lock(&dvbdev_register_lock);
858
859 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
860 num = adapter_nums[i];
861 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
862 /* use the one the driver asked for */
863 if (dvbdev_check_free_adapter_num(num))
864 break;
865 } else {
866 num = dvbdev_get_free_adapter_num();
867 break;
868 }
869 num = -1;
870 }
871
872 if (num < 0) {
873 mutex_unlock(&dvbdev_register_lock);
874 return -ENFILE;
875 }
876
877 memset (adap, 0, sizeof(struct dvb_adapter));
878 INIT_LIST_HEAD (&adap->device_list);
879
880 pr_info("DVB: registering new adapter (%s)\n", name);
881
882 adap->num = num;
883 adap->name = name;
884 adap->module = module;
885 adap->device = device;
886 adap->mfe_shared = 0;
887 adap->mfe_dvbdev = NULL;
888 mutex_init (&adap->mfe_lock);
889
890 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
891 mutex_init(&adap->mdev_lock);
892 #endif
893
894 list_add_tail (&adap->list_head, &dvb_adapter_list);
895
896 mutex_unlock(&dvbdev_register_lock);
897
898 return num;
899 }
900 EXPORT_SYMBOL(dvb_register_adapter);
901
902
dvb_unregister_adapter(struct dvb_adapter * adap)903 int dvb_unregister_adapter(struct dvb_adapter *adap)
904 {
905 mutex_lock(&dvbdev_register_lock);
906 list_del (&adap->list_head);
907 mutex_unlock(&dvbdev_register_lock);
908 return 0;
909 }
910 EXPORT_SYMBOL(dvb_unregister_adapter);
911
912 /* if the miracle happens and "generic_usercopy()" is included into
913 the kernel, then this can vanish. please don't make the mistake and
914 define this as video_usercopy(). this will introduce a dependecy
915 to the v4l "videodev.o" module, which is unnecessary for some
916 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))917 int dvb_usercopy(struct file *file,
918 unsigned int cmd, unsigned long arg,
919 int (*func)(struct file *file,
920 unsigned int cmd, void *arg))
921 {
922 char sbuf[128];
923 void *mbuf = NULL;
924 void *parg = NULL;
925 int err = -EINVAL;
926
927 /* Copy arguments into temp kernel buffer */
928 switch (_IOC_DIR(cmd)) {
929 case _IOC_NONE:
930 /*
931 * For this command, the pointer is actually an integer
932 * argument.
933 */
934 parg = (void *) arg;
935 break;
936 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
937 case _IOC_WRITE:
938 case (_IOC_WRITE | _IOC_READ):
939 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
940 parg = sbuf;
941 } else {
942 /* too big to allocate from stack */
943 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
944 if (NULL == mbuf)
945 return -ENOMEM;
946 parg = mbuf;
947 }
948
949 err = -EFAULT;
950 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
951 goto out;
952 break;
953 }
954
955 /* call driver */
956 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
957 err = -ENOTTY;
958
959 if (err < 0)
960 goto out;
961
962 /* Copy results into user buffer */
963 switch (_IOC_DIR(cmd))
964 {
965 case _IOC_READ:
966 case (_IOC_WRITE | _IOC_READ):
967 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
968 err = -EFAULT;
969 break;
970 }
971
972 out:
973 kfree(mbuf);
974 return err;
975 }
976
977 #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)978 struct i2c_client *dvb_module_probe(const char *module_name,
979 const char *name,
980 struct i2c_adapter *adap,
981 unsigned char addr,
982 void *platform_data)
983 {
984 struct i2c_client *client;
985 struct i2c_board_info *board_info;
986
987 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
988 if (!board_info)
989 return NULL;
990
991 if (name)
992 strlcpy(board_info->type, name, I2C_NAME_SIZE);
993 else
994 strlcpy(board_info->type, module_name, I2C_NAME_SIZE);
995
996 board_info->addr = addr;
997 board_info->platform_data = platform_data;
998 request_module(module_name);
999 client = i2c_new_device(adap, board_info);
1000 if (client == NULL || client->dev.driver == NULL) {
1001 kfree(board_info);
1002 return NULL;
1003 }
1004
1005 if (!try_module_get(client->dev.driver->owner)) {
1006 i2c_unregister_device(client);
1007 client = NULL;
1008 }
1009
1010 kfree(board_info);
1011 return client;
1012 }
1013 EXPORT_SYMBOL_GPL(dvb_module_probe);
1014
dvb_module_release(struct i2c_client * client)1015 void dvb_module_release(struct i2c_client *client)
1016 {
1017 if (!client)
1018 return;
1019
1020 module_put(client->dev.driver->owner);
1021 i2c_unregister_device(client);
1022 }
1023 EXPORT_SYMBOL_GPL(dvb_module_release);
1024 #endif
1025
dvb_uevent(struct device * dev,struct kobj_uevent_env * env)1026 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1027 {
1028 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1029
1030 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1031 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1032 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1033 return 0;
1034 }
1035
dvb_devnode(struct device * dev,umode_t * mode)1036 static char *dvb_devnode(struct device *dev, umode_t *mode)
1037 {
1038 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1039
1040 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1041 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1042 }
1043
1044
init_dvbdev(void)1045 static int __init init_dvbdev(void)
1046 {
1047 int retval;
1048 dev_t dev = MKDEV(DVB_MAJOR, 0);
1049
1050 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1051 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1052 return retval;
1053 }
1054
1055 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1056 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1057 pr_err("dvb-core: unable register character device\n");
1058 goto error;
1059 }
1060
1061 dvb_class = class_create(THIS_MODULE, "dvb");
1062 if (IS_ERR(dvb_class)) {
1063 retval = PTR_ERR(dvb_class);
1064 goto error;
1065 }
1066 dvb_class->dev_uevent = dvb_uevent;
1067 dvb_class->devnode = dvb_devnode;
1068 return 0;
1069
1070 error:
1071 cdev_del(&dvb_device_cdev);
1072 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1073 return retval;
1074 }
1075
1076
exit_dvbdev(void)1077 static void __exit exit_dvbdev(void)
1078 {
1079 class_destroy(dvb_class);
1080 cdev_del(&dvb_device_cdev);
1081 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1082 }
1083
1084 subsys_initcall(init_dvbdev);
1085 module_exit(exit_dvbdev);
1086
1087 MODULE_DESCRIPTION("DVB Core Driver");
1088 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1089 MODULE_LICENSE("GPL");
1090