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