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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / media / dvb-core / dvbdev.c
blob80b6a71aa33e4e081ceccddcec731e5c65230d83
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
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
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
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
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
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
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 dvbdev->adapter->conn = NULL;
245 kfree(dvbdev->adapter->conn_pads);
246 dvbdev->adapter->conn_pads = NULL;
247 }
248 #endif
249 }
250
251 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
252 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
253 const char *name, int npads)
254 {
255 int i, ret = 0;
256
257 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
258 GFP_KERNEL);
259 if (!dvbdev->tsout_pads)
260 return -ENOMEM;
261
262 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
263 GFP_KERNEL);
264 if (!dvbdev->tsout_entity)
265 return -ENOMEM;
266
267 dvbdev->tsout_num_entities = npads;
268
269 for (i = 0; i < npads; i++) {
270 struct media_pad *pads = &dvbdev->tsout_pads[i];
271 struct media_entity *entity = &dvbdev->tsout_entity[i];
272
273 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
274 if (!entity->name)
275 return -ENOMEM;
276
277 entity->function = MEDIA_ENT_F_IO_DTV;
278 pads->flags = MEDIA_PAD_FL_SINK;
279
280 ret = media_entity_pads_init(entity, 1, pads);
281 if (ret < 0)
282 return ret;
283
284 ret = media_device_register_entity(dvbdev->adapter->mdev,
285 entity);
286 if (ret < 0)
287 return ret;
288 }
289 return 0;
290 }
291
292 #define DEMUX_TSOUT "demux-tsout"
293 #define DVR_TSOUT "dvr-tsout"
294
295 static int dvb_create_media_entity(struct dvb_device *dvbdev,
296 int type, int demux_sink_pads)
297 {
298 int i, ret, npads;
299
300 switch (type) {
301 case DVB_DEVICE_FRONTEND:
302 npads = 2;
303 break;
304 case DVB_DEVICE_DVR:
305 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
306 demux_sink_pads);
307 return ret;
308 case DVB_DEVICE_DEMUX:
309 npads = 1 + demux_sink_pads;
310 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
311 demux_sink_pads);
312 if (ret < 0)
313 return ret;
314 break;
315 case DVB_DEVICE_CA:
316 npads = 2;
317 break;
318 case DVB_DEVICE_NET:
319 /*
320 * We should be creating entities for the MPE/ULE
321 * decapsulation hardware (or software implementation).
322 *
323 * However, the number of for the MPE/ULE decaps may not be
324 * fixed. As we don't have yet dynamic support for PADs at
325 * the Media Controller, let's not create the decap
326 * entities yet.
327 */
328 return 0;
329 default:
330 return 0;
331 }
332
333 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
334 if (!dvbdev->entity)
335 return -ENOMEM;
336
337 dvbdev->entity->name = dvbdev->name;
338
339 if (npads) {
340 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
341 GFP_KERNEL);
342 if (!dvbdev->pads) {
343 kfree(dvbdev->entity);
344 return -ENOMEM;
345 }
346 }
347
348 switch (type) {
349 case DVB_DEVICE_FRONTEND:
350 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
351 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
352 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
353 break;
354 case DVB_DEVICE_DEMUX:
355 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
356 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
357 for (i = 1; i < npads; i++)
358 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
359 break;
360 case DVB_DEVICE_CA:
361 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
362 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
363 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
364 break;
365 default:
366 /* Should never happen, as the first switch prevents it */
367 kfree(dvbdev->entity);
368 kfree(dvbdev->pads);
369 dvbdev->entity = NULL;
370 dvbdev->pads = NULL;
371 return 0;
372 }
373
374 if (npads) {
375 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
376 if (ret)
377 return ret;
378 }
379 ret = media_device_register_entity(dvbdev->adapter->mdev,
380 dvbdev->entity);
381 if (ret)
382 return ret;
383
384 pr_info("%s: media entity '%s' registered.\n",
385 __func__, dvbdev->entity->name);
386
387 return 0;
388 }
389 #endif
390
391 static int dvb_register_media_device(struct dvb_device *dvbdev,
392 int type, int minor,
393 unsigned demux_sink_pads)
394 {
395 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
396 struct media_link *link;
397 u32 intf_type;
398 int ret;
399
400 if (!dvbdev->adapter->mdev)
401 return 0;
402
403 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
404 if (ret)
405 return ret;
406
407 switch (type) {
408 case DVB_DEVICE_FRONTEND:
409 intf_type = MEDIA_INTF_T_DVB_FE;
410 break;
411 case DVB_DEVICE_DEMUX:
412 intf_type = MEDIA_INTF_T_DVB_DEMUX;
413 break;
414 case DVB_DEVICE_DVR:
415 intf_type = MEDIA_INTF_T_DVB_DVR;
416 break;
417 case DVB_DEVICE_CA:
418 intf_type = MEDIA_INTF_T_DVB_CA;
419 break;
420 case DVB_DEVICE_NET:
421 intf_type = MEDIA_INTF_T_DVB_NET;
422 break;
423 default:
424 return 0;
425 }
426
427 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
428 intf_type, 0,
429 DVB_MAJOR, minor);
430
431 if (!dvbdev->intf_devnode)
432 return -ENOMEM;
433
434 /*
435 * Create the "obvious" link, e. g. the ones that represent
436 * a direct association between an interface and an entity.
437 * Other links should be created elsewhere, like:
438 * DVB FE intf -> tuner
439 * DVB demux intf -> dvr
440 */
441
442 if (!dvbdev->entity)
443 return 0;
444
445 link = media_create_intf_link(dvbdev->entity,
446 &dvbdev->intf_devnode->intf,
447 MEDIA_LNK_FL_ENABLED |
448 MEDIA_LNK_FL_IMMUTABLE);
449 if (!link)
450 return -ENOMEM;
451 #endif
452 return 0;
453 }
454
455 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
456 const struct dvb_device *template, void *priv,
457 enum dvb_device_type type, int demux_sink_pads)
458 {
459 struct dvb_device *dvbdev;
460 struct file_operations *dvbdevfops;
461 struct device *clsdev;
462 int minor;
463 int id, ret;
464
465 mutex_lock(&dvbdev_register_lock);
466
467 if ((id = dvbdev_get_free_id (adap, type)) < 0){
468 mutex_unlock(&dvbdev_register_lock);
469 *pdvbdev = NULL;
470 pr_err("%s: couldn't find free device id\n", __func__);
471 return -ENFILE;
472 }
473
474 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
475
476 if (!dvbdev){
477 mutex_unlock(&dvbdev_register_lock);
478 return -ENOMEM;
479 }
480
481 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
482
483 if (!dvbdevfops){
484 kfree (dvbdev);
485 mutex_unlock(&dvbdev_register_lock);
486 return -ENOMEM;
487 }
488
489 memcpy(dvbdev, template, sizeof(struct dvb_device));
490 dvbdev->type = type;
491 dvbdev->id = id;
492 dvbdev->adapter = adap;
493 dvbdev->priv = priv;
494 dvbdev->fops = dvbdevfops;
495 init_waitqueue_head (&dvbdev->wait_queue);
496
497 dvbdevfops->owner = adap->module;
498
499 list_add_tail (&dvbdev->list_head, &adap->device_list);
500
501 down_write(&minor_rwsem);
502 #ifdef CONFIG_DVB_DYNAMIC_MINORS
503 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
504 if (dvb_minors[minor] == NULL)
505 break;
506
507 if (minor == MAX_DVB_MINORS) {
508 kfree(dvbdevfops);
509 kfree(dvbdev);
510 up_write(&minor_rwsem);
511 mutex_unlock(&dvbdev_register_lock);
512 return -EINVAL;
513 }
514 #else
515 minor = nums2minor(adap->num, type, id);
516 #endif
517
518 dvbdev->minor = minor;
519 dvb_minors[minor] = dvbdev;
520 up_write(&minor_rwsem);
521
522 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
523 if (ret) {
524 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
525 __func__);
526
527 dvb_media_device_free(dvbdev);
528 kfree(dvbdevfops);
529 kfree(dvbdev);
530 mutex_unlock(&dvbdev_register_lock);
531 return ret;
532 }
533
534 mutex_unlock(&dvbdev_register_lock);
535
536 clsdev = device_create(dvb_class, adap->device,
537 MKDEV(DVB_MAJOR, minor),
538 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
539 if (IS_ERR(clsdev)) {
540 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
541 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
542 return PTR_ERR(clsdev);
543 }
544 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
545 adap->num, dnames[type], id, minor, minor);
546
547 return 0;
548 }
549 EXPORT_SYMBOL(dvb_register_device);
550
551
552 void dvb_remove_device(struct dvb_device *dvbdev)
553 {
554 if (!dvbdev)
555 return;
556
557 down_write(&minor_rwsem);
558 dvb_minors[dvbdev->minor] = NULL;
559 up_write(&minor_rwsem);
560
561 dvb_media_device_free(dvbdev);
562
563 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
564
565 list_del (&dvbdev->list_head);
566 }
567 EXPORT_SYMBOL(dvb_remove_device);
568
569
570 void dvb_free_device(struct dvb_device *dvbdev)
571 {
572 if (!dvbdev)
573 return;
574
575 kfree (dvbdev->fops);
576 kfree (dvbdev);
577 }
578 EXPORT_SYMBOL(dvb_free_device);
579
580
581 void dvb_unregister_device(struct dvb_device *dvbdev)
582 {
583 dvb_remove_device(dvbdev);
584 dvb_free_device(dvbdev);
585 }
586 EXPORT_SYMBOL(dvb_unregister_device);
587
588
589 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
590
591 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
592 struct media_interface *intf,
593 char *name)
594 {
595 struct media_device *mdev = adap->mdev;
596 struct media_entity *entity;
597 struct media_link *link;
598
599 media_device_for_each_entity(entity, mdev) {
600 if (entity->function == MEDIA_ENT_F_IO_DTV) {
601 if (strncmp(entity->name, name, strlen(name)))
602 continue;
603 link = media_create_intf_link(entity, intf,
604 MEDIA_LNK_FL_ENABLED |
605 MEDIA_LNK_FL_IMMUTABLE);
606 if (!link)
607 return -ENOMEM;
608 }
609 }
610 return 0;
611 }
612
613 int dvb_create_media_graph(struct dvb_adapter *adap,
614 bool create_rf_connector)
615 {
616 struct media_device *mdev = adap->mdev;
617 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
618 struct media_entity *demux = NULL, *ca = NULL;
619 struct media_link *link;
620 struct media_interface *intf;
621 unsigned demux_pad = 0;
622 unsigned dvr_pad = 0;
623 unsigned ntuner = 0, ndemod = 0;
624 int ret, pad_source, pad_sink;
625 static const char *connector_name = "Television";
626
627 if (!mdev)
628 return 0;
629
630 media_device_for_each_entity(entity, mdev) {
631 switch (entity->function) {
632 case MEDIA_ENT_F_TUNER:
633 tuner = entity;
634 ntuner++;
635 break;
636 case MEDIA_ENT_F_DTV_DEMOD:
637 demod = entity;
638 ndemod++;
639 break;
640 case MEDIA_ENT_F_TS_DEMUX:
641 demux = entity;
642 break;
643 case MEDIA_ENT_F_DTV_CA:
644 ca = entity;
645 break;
646 }
647 }
648
649 /*
650 * Prepare to signalize to media_create_pad_links() that multiple
651 * entities of the same type exists and a 1:n or n:1 links need to be
652 * created.
653 * NOTE: if both tuner and demod have multiple instances, it is up
654 * to the caller driver to create such links.
655 */
656 if (ntuner > 1)
657 tuner = NULL;
658 if (ndemod > 1)
659 demod = NULL;
660
661 if (create_rf_connector) {
662 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
663 if (!conn)
664 return -ENOMEM;
665 adap->conn = conn;
666
667 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
668 if (!adap->conn_pads)
669 return -ENOMEM;
670
671 conn->flags = MEDIA_ENT_FL_CONNECTOR;
672 conn->function = MEDIA_ENT_F_CONN_RF;
673 conn->name = connector_name;
674 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
675
676 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
677 if (ret)
678 return ret;
679
680 ret = media_device_register_entity(mdev, conn);
681 if (ret)
682 return ret;
683
684 if (!ntuner) {
685 ret = media_create_pad_links(mdev,
686 MEDIA_ENT_F_CONN_RF,
687 conn, 0,
688 MEDIA_ENT_F_DTV_DEMOD,
689 demod, 0,
690 MEDIA_LNK_FL_ENABLED,
691 false);
692 } else {
693 pad_sink = media_get_pad_index(tuner, true,
694 PAD_SIGNAL_ANALOG);
695 if (pad_sink < 0)
696 return -EINVAL;
697 ret = media_create_pad_links(mdev,
698 MEDIA_ENT_F_CONN_RF,
699 conn, 0,
700 MEDIA_ENT_F_TUNER,
701 tuner, pad_sink,
702 MEDIA_LNK_FL_ENABLED,
703 false);
704 }
705 if (ret)
706 return ret;
707 }
708
709 if (ntuner && ndemod) {
710 pad_source = media_get_pad_index(tuner, true,
711 PAD_SIGNAL_ANALOG);
712 if (pad_source)
713 return -EINVAL;
714 ret = media_create_pad_links(mdev,
715 MEDIA_ENT_F_TUNER,
716 tuner, pad_source,
717 MEDIA_ENT_F_DTV_DEMOD,
718 demod, 0, MEDIA_LNK_FL_ENABLED,
719 false);
720 if (ret)
721 return ret;
722 }
723
724 if (ndemod && demux) {
725 ret = media_create_pad_links(mdev,
726 MEDIA_ENT_F_DTV_DEMOD,
727 demod, 1,
728 MEDIA_ENT_F_TS_DEMUX,
729 demux, 0, MEDIA_LNK_FL_ENABLED,
730 false);
731 if (ret)
732 return ret;
733 }
734 if (demux && ca) {
735 ret = media_create_pad_link(demux, 1, ca,
736 0, MEDIA_LNK_FL_ENABLED);
737 if (ret)
738 return ret;
739 }
740
741 /* Create demux links for each ringbuffer/pad */
742 if (demux) {
743 media_device_for_each_entity(entity, mdev) {
744 if (entity->function == MEDIA_ENT_F_IO_DTV) {
745 if (!strncmp(entity->name, DVR_TSOUT,
746 strlen(DVR_TSOUT))) {
747 ret = media_create_pad_link(demux,
748 ++dvr_pad,
749 entity, 0, 0);
750 if (ret)
751 return ret;
752 }
753 if (!strncmp(entity->name, DEMUX_TSOUT,
754 strlen(DEMUX_TSOUT))) {
755 ret = media_create_pad_link(demux,
756 ++demux_pad,
757 entity, 0, 0);
758 if (ret)
759 return ret;
760 }
761 }
762 }
763 }
764
765 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
766 media_device_for_each_intf(intf, mdev) {
767 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
768 link = media_create_intf_link(ca, intf,
769 MEDIA_LNK_FL_ENABLED |
770 MEDIA_LNK_FL_IMMUTABLE);
771 if (!link)
772 return -ENOMEM;
773 }
774
775 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
776 link = media_create_intf_link(tuner, intf,
777 MEDIA_LNK_FL_ENABLED |
778 MEDIA_LNK_FL_IMMUTABLE);
779 if (!link)
780 return -ENOMEM;
781 }
782 #if 0
783 /*
784 * Indirect link - let's not create yet, as we don't know how
785 * to handle indirect links, nor if this will
786 * actually be needed.
787 */
788 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
789 link = media_create_intf_link(demux, intf,
790 MEDIA_LNK_FL_ENABLED |
791 MEDIA_LNK_FL_IMMUTABLE);
792 if (!link)
793 return -ENOMEM;
794 }
795 #endif
796 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
797 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
798 if (ret)
799 return ret;
800 }
801 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
802 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
803 if (ret)
804 return ret;
805 }
806 }
807 return 0;
808 }
809 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
810 #endif
811
812 static int dvbdev_check_free_adapter_num(int num)
813 {
814 struct list_head *entry;
815 list_for_each(entry, &dvb_adapter_list) {
816 struct dvb_adapter *adap;
817 adap = list_entry(entry, struct dvb_adapter, list_head);
818 if (adap->num == num)
819 return 0;
820 }
821 return 1;
822 }
823
824 static int dvbdev_get_free_adapter_num (void)
825 {
826 int num = 0;
827
828 while (num < DVB_MAX_ADAPTERS) {
829 if (dvbdev_check_free_adapter_num(num))
830 return num;
831 num++;
832 }
833
834 return -ENFILE;
835 }
836
837
838 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
839 struct module *module, struct device *device,
840 short *adapter_nums)
841 {
842 int i, num;
843
844 mutex_lock(&dvbdev_register_lock);
845
846 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
847 num = adapter_nums[i];
848 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
849 /* use the one the driver asked for */
850 if (dvbdev_check_free_adapter_num(num))
851 break;
852 } else {
853 num = dvbdev_get_free_adapter_num();
854 break;
855 }
856 num = -1;
857 }
858
859 if (num < 0) {
860 mutex_unlock(&dvbdev_register_lock);
861 return -ENFILE;
862 }
863
864 memset (adap, 0, sizeof(struct dvb_adapter));
865 INIT_LIST_HEAD (&adap->device_list);
866
867 pr_info("DVB: registering new adapter (%s)\n", name);
868
869 adap->num = num;
870 adap->name = name;
871 adap->module = module;
872 adap->device = device;
873 adap->mfe_shared = 0;
874 adap->mfe_dvbdev = NULL;
875 mutex_init (&adap->mfe_lock);
876
877 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
878 mutex_init(&adap->mdev_lock);
879 #endif
880
881 list_add_tail (&adap->list_head, &dvb_adapter_list);
882
883 mutex_unlock(&dvbdev_register_lock);
884
885 return num;
886 }
887 EXPORT_SYMBOL(dvb_register_adapter);
888
889
890 int dvb_unregister_adapter(struct dvb_adapter *adap)
891 {
892 mutex_lock(&dvbdev_register_lock);
893 list_del (&adap->list_head);
894 mutex_unlock(&dvbdev_register_lock);
895 return 0;
896 }
897 EXPORT_SYMBOL(dvb_unregister_adapter);
898
899 /* if the miracle happens and "generic_usercopy()" is included into
900 the kernel, then this can vanish. please don't make the mistake and
901 define this as video_usercopy(). this will introduce a dependency
902 to the v4l "videodev.o" module, which is unnecessary for some
903 cards (ie. the budget dvb-cards don't need the v4l module...) */
904 int dvb_usercopy(struct file *file,
905 unsigned int cmd, unsigned long arg,
906 int (*func)(struct file *file,
907 unsigned int cmd, void *arg))
908 {
909 char sbuf[128];
910 void *mbuf = NULL;
911 void *parg = NULL;
912 int err = -EINVAL;
913
914 /* Copy arguments into temp kernel buffer */
915 switch (_IOC_DIR(cmd)) {
916 case _IOC_NONE:
917 /*
918 * For this command, the pointer is actually an integer
919 * argument.
920 */
921 parg = (void *) arg;
922 break;
923 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
924 case _IOC_WRITE:
925 case (_IOC_WRITE | _IOC_READ):
926 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
927 parg = sbuf;
928 } else {
929 /* too big to allocate from stack */
930 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
931 if (NULL == mbuf)
932 return -ENOMEM;
933 parg = mbuf;
934 }
935
936 err = -EFAULT;
937 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
938 goto out;
939 break;
940 }
941
942 /* call driver */
943 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
944 err = -ENOTTY;
945
946 if (err < 0)
947 goto out;
948
949 /* Copy results into user buffer */
950 switch (_IOC_DIR(cmd))
951 {
952 case _IOC_READ:
953 case (_IOC_WRITE | _IOC_READ):
954 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
955 err = -EFAULT;
956 break;
957 }
958
959 out:
960 kfree(mbuf);
961 return err;
962 }
963
964 #if IS_ENABLED(CONFIG_I2C)
965 struct i2c_client *dvb_module_probe(const char *module_name,
966 const char *name,
967 struct i2c_adapter *adap,
968 unsigned char addr,
969 void *platform_data)
970 {
971 struct i2c_client *client;
972 struct i2c_board_info *board_info;
973
974 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
975 if (!board_info)
976 return NULL;
977
978 if (name)
979 strscpy(board_info->type, name, I2C_NAME_SIZE);
980 else
981 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
982
983 board_info->addr = addr;
984 board_info->platform_data = platform_data;
985 request_module(module_name);
986 client = i2c_new_client_device(adap, board_info);
987 if (!i2c_client_has_driver(client)) {
988 kfree(board_info);
989 return NULL;
990 }
991
992 if (!try_module_get(client->dev.driver->owner)) {
993 i2c_unregister_device(client);
994 client = NULL;
995 }
996
997 kfree(board_info);
998 return client;
999 }
1000 EXPORT_SYMBOL_GPL(dvb_module_probe);
1001
1002 void dvb_module_release(struct i2c_client *client)
1003 {
1004 if (!client)
1005 return;
1006
1007 module_put(client->dev.driver->owner);
1008 i2c_unregister_device(client);
1009 }
1010 EXPORT_SYMBOL_GPL(dvb_module_release);
1011 #endif
1012
1013 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1014 {
1015 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1016
1017 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1018 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1019 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1020 return 0;
1021 }
1022
1023 static char *dvb_devnode(struct device *dev, umode_t *mode)
1024 {
1025 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1026
1027 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1028 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1029 }
1030
1031
1032 static int __init init_dvbdev(void)
1033 {
1034 int retval;
1035 dev_t dev = MKDEV(DVB_MAJOR, 0);
1036
1037 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1038 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1039 return retval;
1040 }
1041
1042 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1043 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1044 pr_err("dvb-core: unable register character device\n");
1045 goto error;
1046 }
1047
1048 dvb_class = class_create(THIS_MODULE, "dvb");
1049 if (IS_ERR(dvb_class)) {
1050 retval = PTR_ERR(dvb_class);
1051 goto error;
1052 }
1053 dvb_class->dev_uevent = dvb_uevent;
1054 dvb_class->devnode = dvb_devnode;
1055 return 0;
1056
1057 error:
1058 cdev_del(&dvb_device_cdev);
1059 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1060 return retval;
1061 }
1062
1063
1064 static void __exit exit_dvbdev(void)
1065 {
1066 class_destroy(dvb_class);
1067 cdev_del(&dvb_device_cdev);
1068 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1069 }
1070
1071 subsys_initcall(init_dvbdev);
1072 module_exit(exit_dvbdev);
1073
1074 MODULE_DESCRIPTION("DVB Core Driver");
1075 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1076 MODULE_LICENSE("GPL");
Linux with added FPC-III support