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 = 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 return 0;
175 }
176 EXPORT_SYMBOL(dvb_generic_release);
177
178
dvb_generic_ioctl(struct file * file,unsigned int cmd,unsigned long arg)179 long dvb_generic_ioctl(struct file *file,
180 unsigned int cmd, unsigned long arg)
181 {
182 struct dvb_device *dvbdev = file->private_data;
183
184 if (!dvbdev)
185 return -ENODEV;
186
187 if (!dvbdev->kernel_ioctl)
188 return -EINVAL;
189
190 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
191 }
192 EXPORT_SYMBOL(dvb_generic_ioctl);
193
194
dvbdev_get_free_id(struct dvb_adapter * adap,int type)195 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
196 {
197 u32 id = 0;
198
199 while (id < DVB_MAX_IDS) {
200 struct dvb_device *dev;
201 list_for_each_entry(dev, &adap->device_list, list_head)
202 if (dev->type == type && dev->id == id)
203 goto skip;
204 return id;
205 skip:
206 id++;
207 }
208 return -ENFILE;
209 }
210
dvb_media_device_free(struct dvb_device * dvbdev)211 static void dvb_media_device_free(struct dvb_device *dvbdev)
212 {
213 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
214 if (dvbdev->entity) {
215 media_device_unregister_entity(dvbdev->entity);
216 kfree(dvbdev->entity);
217 kfree(dvbdev->pads);
218 dvbdev->entity = NULL;
219 dvbdev->pads = NULL;
220 }
221
222 if (dvbdev->tsout_entity) {
223 int i;
224
225 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
226 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
227 kfree(dvbdev->tsout_entity[i].name);
228 }
229 kfree(dvbdev->tsout_entity);
230 kfree(dvbdev->tsout_pads);
231 dvbdev->tsout_entity = NULL;
232 dvbdev->tsout_pads = NULL;
233
234 dvbdev->tsout_num_entities = 0;
235 }
236
237 if (dvbdev->intf_devnode) {
238 media_devnode_remove(dvbdev->intf_devnode);
239 dvbdev->intf_devnode = NULL;
240 }
241
242 if (dvbdev->adapter->conn) {
243 media_device_unregister_entity(dvbdev->adapter->conn);
244 kfree(dvbdev->adapter->conn);
245 dvbdev->adapter->conn = NULL;
246 kfree(dvbdev->adapter->conn_pads);
247 dvbdev->adapter->conn_pads = NULL;
248 }
249 #endif
250 }
251
252 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
dvb_create_tsout_entity(struct dvb_device * dvbdev,const char * name,int npads)253 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
254 const char *name, int npads)
255 {
256 int i, ret = 0;
257
258 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
259 GFP_KERNEL);
260 if (!dvbdev->tsout_pads)
261 return -ENOMEM;
262
263 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
264 GFP_KERNEL);
265 if (!dvbdev->tsout_entity)
266 return -ENOMEM;
267
268 dvbdev->tsout_num_entities = npads;
269
270 for (i = 0; i < npads; i++) {
271 struct media_pad *pads = &dvbdev->tsout_pads[i];
272 struct media_entity *entity = &dvbdev->tsout_entity[i];
273
274 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
275 if (!entity->name)
276 return -ENOMEM;
277
278 entity->function = MEDIA_ENT_F_IO_DTV;
279 pads->flags = MEDIA_PAD_FL_SINK;
280
281 ret = media_entity_pads_init(entity, 1, pads);
282 if (ret < 0)
283 return ret;
284
285 ret = media_device_register_entity(dvbdev->adapter->mdev,
286 entity);
287 if (ret < 0)
288 return ret;
289 }
290 return 0;
291 }
292
293 #define DEMUX_TSOUT "demux-tsout"
294 #define DVR_TSOUT "dvr-tsout"
295
dvb_create_media_entity(struct dvb_device * dvbdev,int type,int demux_sink_pads)296 static int dvb_create_media_entity(struct dvb_device *dvbdev,
297 int type, int demux_sink_pads)
298 {
299 int i, ret, npads;
300
301 switch (type) {
302 case DVB_DEVICE_FRONTEND:
303 npads = 2;
304 break;
305 case DVB_DEVICE_DVR:
306 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
307 demux_sink_pads);
308 return ret;
309 case DVB_DEVICE_DEMUX:
310 npads = 1 + demux_sink_pads;
311 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
312 demux_sink_pads);
313 if (ret < 0)
314 return ret;
315 break;
316 case DVB_DEVICE_CA:
317 npads = 2;
318 break;
319 case DVB_DEVICE_NET:
320 /*
321 * We should be creating entities for the MPE/ULE
322 * decapsulation hardware (or software implementation).
323 *
324 * However, the number of for the MPE/ULE decaps may not be
325 * fixed. As we don't have yet dynamic support for PADs at
326 * the Media Controller, let's not create the decap
327 * entities yet.
328 */
329 return 0;
330 default:
331 return 0;
332 }
333
334 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
335 if (!dvbdev->entity)
336 return -ENOMEM;
337
338 dvbdev->entity->name = dvbdev->name;
339
340 if (npads) {
341 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
342 GFP_KERNEL);
343 if (!dvbdev->pads) {
344 kfree(dvbdev->entity);
345 return -ENOMEM;
346 }
347 }
348
349 switch (type) {
350 case DVB_DEVICE_FRONTEND:
351 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
352 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
353 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
354 break;
355 case DVB_DEVICE_DEMUX:
356 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
357 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
358 for (i = 1; i < npads; i++)
359 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
360 break;
361 case DVB_DEVICE_CA:
362 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
363 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
364 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
365 break;
366 default:
367 /* Should never happen, as the first switch prevents it */
368 kfree(dvbdev->entity);
369 kfree(dvbdev->pads);
370 dvbdev->entity = NULL;
371 dvbdev->pads = NULL;
372 return 0;
373 }
374
375 if (npads) {
376 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
377 if (ret)
378 return ret;
379 }
380 ret = media_device_register_entity(dvbdev->adapter->mdev,
381 dvbdev->entity);
382 if (ret)
383 return ret;
384
385 pr_info("%s: media entity '%s' registered.\n",
386 __func__, dvbdev->entity->name);
387
388 return 0;
389 }
390 #endif
391
dvb_register_media_device(struct dvb_device * dvbdev,int type,int minor,unsigned demux_sink_pads)392 static int dvb_register_media_device(struct dvb_device *dvbdev,
393 int type, int minor,
394 unsigned demux_sink_pads)
395 {
396 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
397 struct media_link *link;
398 u32 intf_type;
399 int ret;
400
401 if (!dvbdev->adapter->mdev)
402 return 0;
403
404 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
405 if (ret)
406 return ret;
407
408 switch (type) {
409 case DVB_DEVICE_FRONTEND:
410 intf_type = MEDIA_INTF_T_DVB_FE;
411 break;
412 case DVB_DEVICE_DEMUX:
413 intf_type = MEDIA_INTF_T_DVB_DEMUX;
414 break;
415 case DVB_DEVICE_DVR:
416 intf_type = MEDIA_INTF_T_DVB_DVR;
417 break;
418 case DVB_DEVICE_CA:
419 intf_type = MEDIA_INTF_T_DVB_CA;
420 break;
421 case DVB_DEVICE_NET:
422 intf_type = MEDIA_INTF_T_DVB_NET;
423 break;
424 default:
425 return 0;
426 }
427
428 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
429 intf_type, 0,
430 DVB_MAJOR, minor);
431
432 if (!dvbdev->intf_devnode)
433 return -ENOMEM;
434
435 /*
436 * Create the "obvious" link, e. g. the ones that represent
437 * a direct association between an interface and an entity.
438 * Other links should be created elsewhere, like:
439 * DVB FE intf -> tuner
440 * DVB demux intf -> dvr
441 */
442
443 if (!dvbdev->entity)
444 return 0;
445
446 link = media_create_intf_link(dvbdev->entity,
447 &dvbdev->intf_devnode->intf,
448 MEDIA_LNK_FL_ENABLED |
449 MEDIA_LNK_FL_IMMUTABLE);
450 if (!link)
451 return -ENOMEM;
452 #endif
453 return 0;
454 }
455
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)456 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
457 const struct dvb_device *template, void *priv,
458 enum dvb_device_type type, int demux_sink_pads)
459 {
460 struct dvb_device *dvbdev;
461 struct file_operations *dvbdevfops;
462 struct device *clsdev;
463 int minor;
464 int id, ret;
465
466 mutex_lock(&dvbdev_register_lock);
467
468 if ((id = dvbdev_get_free_id (adap, type)) < 0){
469 mutex_unlock(&dvbdev_register_lock);
470 *pdvbdev = NULL;
471 pr_err("%s: couldn't find free device id\n", __func__);
472 return -ENFILE;
473 }
474
475 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
476
477 if (!dvbdev){
478 mutex_unlock(&dvbdev_register_lock);
479 return -ENOMEM;
480 }
481
482 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
483
484 if (!dvbdevfops){
485 kfree (dvbdev);
486 mutex_unlock(&dvbdev_register_lock);
487 return -ENOMEM;
488 }
489
490 memcpy(dvbdev, template, sizeof(struct dvb_device));
491 dvbdev->type = type;
492 dvbdev->id = id;
493 dvbdev->adapter = adap;
494 dvbdev->priv = priv;
495 dvbdev->fops = dvbdevfops;
496 init_waitqueue_head (&dvbdev->wait_queue);
497
498 dvbdevfops->owner = adap->module;
499
500 list_add_tail (&dvbdev->list_head, &adap->device_list);
501
502 down_write(&minor_rwsem);
503 #ifdef CONFIG_DVB_DYNAMIC_MINORS
504 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
505 if (dvb_minors[minor] == NULL)
506 break;
507
508 if (minor == MAX_DVB_MINORS) {
509 kfree(dvbdevfops);
510 kfree(dvbdev);
511 up_write(&minor_rwsem);
512 mutex_unlock(&dvbdev_register_lock);
513 return -EINVAL;
514 }
515 #else
516 minor = nums2minor(adap->num, type, id);
517 #endif
518
519 dvbdev->minor = minor;
520 dvb_minors[minor] = dvbdev;
521 up_write(&minor_rwsem);
522
523 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
524 if (ret) {
525 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
526 __func__);
527
528 dvb_media_device_free(dvbdev);
529 kfree(dvbdevfops);
530 kfree(dvbdev);
531 mutex_unlock(&dvbdev_register_lock);
532 return ret;
533 }
534
535 mutex_unlock(&dvbdev_register_lock);
536
537 clsdev = device_create(dvb_class, adap->device,
538 MKDEV(DVB_MAJOR, minor),
539 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
540 if (IS_ERR(clsdev)) {
541 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
542 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
543 return PTR_ERR(clsdev);
544 }
545 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
546 adap->num, dnames[type], id, minor, minor);
547
548 return 0;
549 }
550 EXPORT_SYMBOL(dvb_register_device);
551
552
dvb_remove_device(struct dvb_device * dvbdev)553 void dvb_remove_device(struct dvb_device *dvbdev)
554 {
555 if (!dvbdev)
556 return;
557
558 down_write(&minor_rwsem);
559 dvb_minors[dvbdev->minor] = NULL;
560 up_write(&minor_rwsem);
561
562 dvb_media_device_free(dvbdev);
563
564 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
565
566 list_del (&dvbdev->list_head);
567 }
568 EXPORT_SYMBOL(dvb_remove_device);
569
570
dvb_free_device(struct dvb_device * dvbdev)571 void dvb_free_device(struct dvb_device *dvbdev)
572 {
573 if (!dvbdev)
574 return;
575
576 kfree (dvbdev->fops);
577 kfree (dvbdev);
578 }
579 EXPORT_SYMBOL(dvb_free_device);
580
581
dvb_unregister_device(struct dvb_device * dvbdev)582 void dvb_unregister_device(struct dvb_device *dvbdev)
583 {
584 dvb_remove_device(dvbdev);
585 dvb_free_device(dvbdev);
586 }
587 EXPORT_SYMBOL(dvb_unregister_device);
588
589
590 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
591
dvb_create_io_intf_links(struct dvb_adapter * adap,struct media_interface * intf,char * name)592 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
593 struct media_interface *intf,
594 char *name)
595 {
596 struct media_device *mdev = adap->mdev;
597 struct media_entity *entity;
598 struct media_link *link;
599
600 media_device_for_each_entity(entity, mdev) {
601 if (entity->function == MEDIA_ENT_F_IO_DTV) {
602 if (strncmp(entity->name, name, strlen(name)))
603 continue;
604 link = media_create_intf_link(entity, intf,
605 MEDIA_LNK_FL_ENABLED |
606 MEDIA_LNK_FL_IMMUTABLE);
607 if (!link)
608 return -ENOMEM;
609 }
610 }
611 return 0;
612 }
613
dvb_create_media_graph(struct dvb_adapter * adap,bool create_rf_connector)614 int dvb_create_media_graph(struct dvb_adapter *adap,
615 bool create_rf_connector)
616 {
617 struct media_device *mdev = adap->mdev;
618 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
619 struct media_entity *demux = NULL, *ca = NULL;
620 struct media_link *link;
621 struct media_interface *intf;
622 unsigned demux_pad = 0;
623 unsigned dvr_pad = 0;
624 unsigned ntuner = 0, ndemod = 0;
625 int ret, pad_source, pad_sink;
626 static const char *connector_name = "Television";
627
628 if (!mdev)
629 return 0;
630
631 media_device_for_each_entity(entity, mdev) {
632 switch (entity->function) {
633 case MEDIA_ENT_F_TUNER:
634 tuner = entity;
635 ntuner++;
636 break;
637 case MEDIA_ENT_F_DTV_DEMOD:
638 demod = entity;
639 ndemod++;
640 break;
641 case MEDIA_ENT_F_TS_DEMUX:
642 demux = entity;
643 break;
644 case MEDIA_ENT_F_DTV_CA:
645 ca = entity;
646 break;
647 }
648 }
649
650 /*
651 * Prepare to signalize to media_create_pad_links() that multiple
652 * entities of the same type exists and a 1:n or n:1 links need to be
653 * created.
654 * NOTE: if both tuner and demod have multiple instances, it is up
655 * to the caller driver to create such links.
656 */
657 if (ntuner > 1)
658 tuner = NULL;
659 if (ndemod > 1)
660 demod = NULL;
661
662 if (create_rf_connector) {
663 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
664 if (!conn)
665 return -ENOMEM;
666 adap->conn = conn;
667
668 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
669 if (!adap->conn_pads)
670 return -ENOMEM;
671
672 conn->flags = MEDIA_ENT_FL_CONNECTOR;
673 conn->function = MEDIA_ENT_F_CONN_RF;
674 conn->name = connector_name;
675 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
676
677 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
678 if (ret)
679 return ret;
680
681 ret = media_device_register_entity(mdev, conn);
682 if (ret)
683 return ret;
684
685 if (!ntuner) {
686 ret = media_create_pad_links(mdev,
687 MEDIA_ENT_F_CONN_RF,
688 conn, 0,
689 MEDIA_ENT_F_DTV_DEMOD,
690 demod, 0,
691 MEDIA_LNK_FL_ENABLED,
692 false);
693 } else {
694 pad_sink = media_get_pad_index(tuner, true,
695 PAD_SIGNAL_ANALOG);
696 if (pad_sink < 0)
697 return -EINVAL;
698 ret = media_create_pad_links(mdev,
699 MEDIA_ENT_F_CONN_RF,
700 conn, 0,
701 MEDIA_ENT_F_TUNER,
702 tuner, pad_sink,
703 MEDIA_LNK_FL_ENABLED,
704 false);
705 }
706 if (ret)
707 return ret;
708 }
709
710 if (ntuner && ndemod) {
711 /* NOTE: first found tuner source pad presumed correct */
712 pad_source = media_get_pad_index(tuner, false,
713 PAD_SIGNAL_ANALOG);
714 if (pad_source < 0)
715 return -EINVAL;
716 ret = media_create_pad_links(mdev,
717 MEDIA_ENT_F_TUNER,
718 tuner, pad_source,
719 MEDIA_ENT_F_DTV_DEMOD,
720 demod, 0, MEDIA_LNK_FL_ENABLED,
721 false);
722 if (ret)
723 return ret;
724 }
725
726 if (ndemod && demux) {
727 ret = media_create_pad_links(mdev,
728 MEDIA_ENT_F_DTV_DEMOD,
729 demod, 1,
730 MEDIA_ENT_F_TS_DEMUX,
731 demux, 0, MEDIA_LNK_FL_ENABLED,
732 false);
733 if (ret)
734 return ret;
735 }
736 if (demux && ca) {
737 ret = media_create_pad_link(demux, 1, ca,
738 0, MEDIA_LNK_FL_ENABLED);
739 if (ret)
740 return ret;
741 }
742
743 /* Create demux links for each ringbuffer/pad */
744 if (demux) {
745 media_device_for_each_entity(entity, mdev) {
746 if (entity->function == MEDIA_ENT_F_IO_DTV) {
747 if (!strncmp(entity->name, DVR_TSOUT,
748 strlen(DVR_TSOUT))) {
749 ret = media_create_pad_link(demux,
750 ++dvr_pad,
751 entity, 0, 0);
752 if (ret)
753 return ret;
754 }
755 if (!strncmp(entity->name, DEMUX_TSOUT,
756 strlen(DEMUX_TSOUT))) {
757 ret = media_create_pad_link(demux,
758 ++demux_pad,
759 entity, 0, 0);
760 if (ret)
761 return ret;
762 }
763 }
764 }
765 }
766
767 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
768 media_device_for_each_intf(intf, mdev) {
769 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
770 link = media_create_intf_link(ca, intf,
771 MEDIA_LNK_FL_ENABLED |
772 MEDIA_LNK_FL_IMMUTABLE);
773 if (!link)
774 return -ENOMEM;
775 }
776
777 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
778 link = media_create_intf_link(tuner, intf,
779 MEDIA_LNK_FL_ENABLED |
780 MEDIA_LNK_FL_IMMUTABLE);
781 if (!link)
782 return -ENOMEM;
783 }
784 #if 0
785 /*
786 * Indirect link - let's not create yet, as we don't know how
787 * to handle indirect links, nor if this will
788 * actually be needed.
789 */
790 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
791 link = media_create_intf_link(demux, intf,
792 MEDIA_LNK_FL_ENABLED |
793 MEDIA_LNK_FL_IMMUTABLE);
794 if (!link)
795 return -ENOMEM;
796 }
797 #endif
798 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
799 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
800 if (ret)
801 return ret;
802 }
803 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
804 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
805 if (ret)
806 return ret;
807 }
808 }
809 return 0;
810 }
811 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
812 #endif
813
dvbdev_check_free_adapter_num(int num)814 static int dvbdev_check_free_adapter_num(int num)
815 {
816 struct list_head *entry;
817 list_for_each(entry, &dvb_adapter_list) {
818 struct dvb_adapter *adap;
819 adap = list_entry(entry, struct dvb_adapter, list_head);
820 if (adap->num == num)
821 return 0;
822 }
823 return 1;
824 }
825
dvbdev_get_free_adapter_num(void)826 static int dvbdev_get_free_adapter_num (void)
827 {
828 int num = 0;
829
830 while (num < DVB_MAX_ADAPTERS) {
831 if (dvbdev_check_free_adapter_num(num))
832 return num;
833 num++;
834 }
835
836 return -ENFILE;
837 }
838
839
dvb_register_adapter(struct dvb_adapter * adap,const char * name,struct module * module,struct device * device,short * adapter_nums)840 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
841 struct module *module, struct device *device,
842 short *adapter_nums)
843 {
844 int i, num;
845
846 mutex_lock(&dvbdev_register_lock);
847
848 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
849 num = adapter_nums[i];
850 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
851 /* use the one the driver asked for */
852 if (dvbdev_check_free_adapter_num(num))
853 break;
854 } else {
855 num = dvbdev_get_free_adapter_num();
856 break;
857 }
858 num = -1;
859 }
860
861 if (num < 0) {
862 mutex_unlock(&dvbdev_register_lock);
863 return -ENFILE;
864 }
865
866 memset (adap, 0, sizeof(struct dvb_adapter));
867 INIT_LIST_HEAD (&adap->device_list);
868
869 pr_info("DVB: registering new adapter (%s)\n", name);
870
871 adap->num = num;
872 adap->name = name;
873 adap->module = module;
874 adap->device = device;
875 adap->mfe_shared = 0;
876 adap->mfe_dvbdev = NULL;
877 mutex_init (&adap->mfe_lock);
878
879 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
880 mutex_init(&adap->mdev_lock);
881 #endif
882
883 list_add_tail (&adap->list_head, &dvb_adapter_list);
884
885 mutex_unlock(&dvbdev_register_lock);
886
887 return num;
888 }
889 EXPORT_SYMBOL(dvb_register_adapter);
890
891
dvb_unregister_adapter(struct dvb_adapter * adap)892 int dvb_unregister_adapter(struct dvb_adapter *adap)
893 {
894 mutex_lock(&dvbdev_register_lock);
895 list_del (&adap->list_head);
896 mutex_unlock(&dvbdev_register_lock);
897 return 0;
898 }
899 EXPORT_SYMBOL(dvb_unregister_adapter);
900
901 /* if the miracle happens and "generic_usercopy()" is included into
902 the kernel, then this can vanish. please don't make the mistake and
903 define this as video_usercopy(). this will introduce a dependency
904 to the v4l "videodev.o" module, which is unnecessary for some
905 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))906 int dvb_usercopy(struct file *file,
907 unsigned int cmd, unsigned long arg,
908 int (*func)(struct file *file,
909 unsigned int cmd, void *arg))
910 {
911 char sbuf[128];
912 void *mbuf = NULL;
913 void *parg = NULL;
914 int err = -EINVAL;
915
916 /* Copy arguments into temp kernel buffer */
917 switch (_IOC_DIR(cmd)) {
918 case _IOC_NONE:
919 /*
920 * For this command, the pointer is actually an integer
921 * argument.
922 */
923 parg = (void *) arg;
924 break;
925 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
926 case _IOC_WRITE:
927 case (_IOC_WRITE | _IOC_READ):
928 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
929 parg = sbuf;
930 } else {
931 /* too big to allocate from stack */
932 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
933 if (NULL == mbuf)
934 return -ENOMEM;
935 parg = mbuf;
936 }
937
938 err = -EFAULT;
939 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
940 goto out;
941 break;
942 }
943
944 /* call driver */
945 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
946 err = -ENOTTY;
947
948 if (err < 0)
949 goto out;
950
951 /* Copy results into user buffer */
952 switch (_IOC_DIR(cmd))
953 {
954 case _IOC_READ:
955 case (_IOC_WRITE | _IOC_READ):
956 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
957 err = -EFAULT;
958 break;
959 }
960
961 out:
962 kfree(mbuf);
963 return err;
964 }
965
966 #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)967 struct i2c_client *dvb_module_probe(const char *module_name,
968 const char *name,
969 struct i2c_adapter *adap,
970 unsigned char addr,
971 void *platform_data)
972 {
973 struct i2c_client *client;
974 struct i2c_board_info *board_info;
975
976 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
977 if (!board_info)
978 return NULL;
979
980 if (name)
981 strscpy(board_info->type, name, I2C_NAME_SIZE);
982 else
983 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
984
985 board_info->addr = addr;
986 board_info->platform_data = platform_data;
987 request_module(module_name);
988 client = i2c_new_client_device(adap, board_info);
989 if (!i2c_client_has_driver(client)) {
990 kfree(board_info);
991 return NULL;
992 }
993
994 if (!try_module_get(client->dev.driver->owner)) {
995 i2c_unregister_device(client);
996 client = NULL;
997 }
998
999 kfree(board_info);
1000 return client;
1001 }
1002 EXPORT_SYMBOL_GPL(dvb_module_probe);
1003
dvb_module_release(struct i2c_client * client)1004 void dvb_module_release(struct i2c_client *client)
1005 {
1006 if (!client)
1007 return;
1008
1009 module_put(client->dev.driver->owner);
1010 i2c_unregister_device(client);
1011 }
1012 EXPORT_SYMBOL_GPL(dvb_module_release);
1013 #endif
1014
dvb_uevent(struct device * dev,struct kobj_uevent_env * env)1015 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1016 {
1017 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1018
1019 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1020 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1021 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1022 return 0;
1023 }
1024
dvb_devnode(struct device * dev,umode_t * mode)1025 static char *dvb_devnode(struct device *dev, umode_t *mode)
1026 {
1027 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1028
1029 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1030 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1031 }
1032
1033
init_dvbdev(void)1034 static int __init init_dvbdev(void)
1035 {
1036 int retval;
1037 dev_t dev = MKDEV(DVB_MAJOR, 0);
1038
1039 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1040 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1041 return retval;
1042 }
1043
1044 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1045 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1046 pr_err("dvb-core: unable register character device\n");
1047 goto error;
1048 }
1049
1050 dvb_class = class_create(THIS_MODULE, "dvb");
1051 if (IS_ERR(dvb_class)) {
1052 retval = PTR_ERR(dvb_class);
1053 goto error;
1054 }
1055 dvb_class->dev_uevent = dvb_uevent;
1056 dvb_class->devnode = dvb_devnode;
1057 return 0;
1058
1059 error:
1060 cdev_del(&dvb_device_cdev);
1061 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1062 return retval;
1063 }
1064
1065
exit_dvbdev(void)1066 static void __exit exit_dvbdev(void)
1067 {
1068 class_destroy(dvb_class);
1069 cdev_del(&dvb_device_cdev);
1070 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1071 }
1072
1073 subsys_initcall(init_dvbdev);
1074 module_exit(exit_dvbdev);
1075
1076 MODULE_DESCRIPTION("DVB Core Driver");
1077 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1078 MODULE_LICENSE("GPL");
1079