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KVM: arm64: Fix order of vcpu_write_sys_reg() arguments
[linux/fpc-iii.git] / drivers / media / dvb-core / dvbdev.c
blob787fe06df2176ae4e41e6b98aff06b482acba7a3
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 return -ENOMEM;
344 }
345
346 switch (type) {
347 case DVB_DEVICE_FRONTEND:
348 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
349 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
350 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
351 break;
352 case DVB_DEVICE_DEMUX:
353 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
354 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
355 for (i = 1; i < npads; i++)
356 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
357 break;
358 case DVB_DEVICE_CA:
359 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
360 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
361 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
362 break;
363 default:
364 /* Should never happen, as the first switch prevents it */
365 kfree(dvbdev->entity);
366 kfree(dvbdev->pads);
367 dvbdev->entity = NULL;
368 dvbdev->pads = NULL;
369 return 0;
370 }
371
372 if (npads) {
373 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
374 if (ret)
375 return ret;
376 }
377 ret = media_device_register_entity(dvbdev->adapter->mdev,
378 dvbdev->entity);
379 if (ret)
380 return ret;
381
382 pr_info("%s: media entity '%s' registered.\n",
383 __func__, dvbdev->entity->name);
384
385 return 0;
386 }
387 #endif
388
389 static int dvb_register_media_device(struct dvb_device *dvbdev,
390 int type, int minor,
391 unsigned demux_sink_pads)
392 {
393 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
394 struct media_link *link;
395 u32 intf_type;
396 int ret;
397
398 if (!dvbdev->adapter->mdev)
399 return 0;
400
401 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
402 if (ret)
403 return ret;
404
405 switch (type) {
406 case DVB_DEVICE_FRONTEND:
407 intf_type = MEDIA_INTF_T_DVB_FE;
408 break;
409 case DVB_DEVICE_DEMUX:
410 intf_type = MEDIA_INTF_T_DVB_DEMUX;
411 break;
412 case DVB_DEVICE_DVR:
413 intf_type = MEDIA_INTF_T_DVB_DVR;
414 break;
415 case DVB_DEVICE_CA:
416 intf_type = MEDIA_INTF_T_DVB_CA;
417 break;
418 case DVB_DEVICE_NET:
419 intf_type = MEDIA_INTF_T_DVB_NET;
420 break;
421 default:
422 return 0;
423 }
424
425 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
426 intf_type, 0,
427 DVB_MAJOR, minor);
428
429 if (!dvbdev->intf_devnode)
430 return -ENOMEM;
431
432 /*
433 * Create the "obvious" link, e. g. the ones that represent
434 * a direct association between an interface and an entity.
435 * Other links should be created elsewhere, like:
436 * DVB FE intf -> tuner
437 * DVB demux intf -> dvr
438 */
439
440 if (!dvbdev->entity)
441 return 0;
442
443 link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf,
444 MEDIA_LNK_FL_ENABLED);
445 if (!link)
446 return -ENOMEM;
447 #endif
448 return 0;
449 }
450
451 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
452 const struct dvb_device *template, void *priv,
453 enum dvb_device_type type, int demux_sink_pads)
454 {
455 struct dvb_device *dvbdev;
456 struct file_operations *dvbdevfops;
457 struct device *clsdev;
458 int minor;
459 int id, ret;
460
461 mutex_lock(&dvbdev_register_lock);
462
463 if ((id = dvbdev_get_free_id (adap, type)) < 0){
464 mutex_unlock(&dvbdev_register_lock);
465 *pdvbdev = NULL;
466 pr_err("%s: couldn't find free device id\n", __func__);
467 return -ENFILE;
468 }
469
470 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
471
472 if (!dvbdev){
473 mutex_unlock(&dvbdev_register_lock);
474 return -ENOMEM;
475 }
476
477 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
478
479 if (!dvbdevfops){
480 kfree (dvbdev);
481 mutex_unlock(&dvbdev_register_lock);
482 return -ENOMEM;
483 }
484
485 memcpy(dvbdev, template, sizeof(struct dvb_device));
486 dvbdev->type = type;
487 dvbdev->id = id;
488 dvbdev->adapter = adap;
489 dvbdev->priv = priv;
490 dvbdev->fops = dvbdevfops;
491 init_waitqueue_head (&dvbdev->wait_queue);
492
493 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
494 dvbdevfops->owner = adap->module;
495
496 list_add_tail (&dvbdev->list_head, &adap->device_list);
497
498 down_write(&minor_rwsem);
499 #ifdef CONFIG_DVB_DYNAMIC_MINORS
500 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
501 if (dvb_minors[minor] == NULL)
502 break;
503
504 if (minor == MAX_DVB_MINORS) {
505 kfree(dvbdevfops);
506 kfree(dvbdev);
507 up_write(&minor_rwsem);
508 mutex_unlock(&dvbdev_register_lock);
509 return -EINVAL;
510 }
511 #else
512 minor = nums2minor(adap->num, type, id);
513 #endif
514
515 dvbdev->minor = minor;
516 dvb_minors[minor] = dvbdev;
517 up_write(&minor_rwsem);
518
519 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
520 if (ret) {
521 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
522 __func__);
523
524 dvb_media_device_free(dvbdev);
525 kfree(dvbdevfops);
526 kfree(dvbdev);
527 up_write(&minor_rwsem);
528 mutex_unlock(&dvbdev_register_lock);
529 return ret;
530 }
531
532 mutex_unlock(&dvbdev_register_lock);
533
534 clsdev = device_create(dvb_class, adap->device,
535 MKDEV(DVB_MAJOR, minor),
536 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
537 if (IS_ERR(clsdev)) {
538 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
539 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
540 return PTR_ERR(clsdev);
541 }
542 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
543 adap->num, dnames[type], id, minor, minor);
544
545 return 0;
546 }
547 EXPORT_SYMBOL(dvb_register_device);
548
549
550 void dvb_remove_device(struct dvb_device *dvbdev)
551 {
552 if (!dvbdev)
553 return;
554
555 down_write(&minor_rwsem);
556 dvb_minors[dvbdev->minor] = NULL;
557 up_write(&minor_rwsem);
558
559 dvb_media_device_free(dvbdev);
560
561 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
562
563 list_del (&dvbdev->list_head);
564 }
565 EXPORT_SYMBOL(dvb_remove_device);
566
567
568 void dvb_free_device(struct dvb_device *dvbdev)
569 {
570 if (!dvbdev)
571 return;
572
573 kfree (dvbdev->fops);
574 kfree (dvbdev);
575 }
576 EXPORT_SYMBOL(dvb_free_device);
577
578
579 void dvb_unregister_device(struct dvb_device *dvbdev)
580 {
581 dvb_remove_device(dvbdev);
582 dvb_free_device(dvbdev);
583 }
584 EXPORT_SYMBOL(dvb_unregister_device);
585
586
587 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
588
589 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
590 struct media_interface *intf,
591 char *name)
592 {
593 struct media_device *mdev = adap->mdev;
594 struct media_entity *entity;
595 struct media_link *link;
596
597 media_device_for_each_entity(entity, mdev) {
598 if (entity->function == MEDIA_ENT_F_IO_DTV) {
599 if (strncmp(entity->name, name, strlen(name)))
600 continue;
601 link = media_create_intf_link(entity, intf,
602 MEDIA_LNK_FL_ENABLED);
603 if (!link)
604 return -ENOMEM;
605 }
606 }
607 return 0;
608 }
609
610 int dvb_create_media_graph(struct dvb_adapter *adap,
611 bool create_rf_connector)
612 {
613 struct media_device *mdev = adap->mdev;
614 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
615 struct media_entity *demux = NULL, *ca = NULL;
616 struct media_link *link;
617 struct media_interface *intf;
618 unsigned demux_pad = 0;
619 unsigned dvr_pad = 0;
620 unsigned ntuner = 0, ndemod = 0;
621 int ret;
622 static const char *connector_name = "Television";
623
624 if (!mdev)
625 return 0;
626
627 media_device_for_each_entity(entity, mdev) {
628 switch (entity->function) {
629 case MEDIA_ENT_F_TUNER:
630 tuner = entity;
631 ntuner++;
632 break;
633 case MEDIA_ENT_F_DTV_DEMOD:
634 demod = entity;
635 ndemod++;
636 break;
637 case MEDIA_ENT_F_TS_DEMUX:
638 demux = entity;
639 break;
640 case MEDIA_ENT_F_DTV_CA:
641 ca = entity;
642 break;
643 }
644 }
645
646 /*
647 * Prepare to signalize to media_create_pad_links() that multiple
648 * entities of the same type exists and a 1:n or n:1 links need to be
649 * created.
650 * NOTE: if both tuner and demod have multiple instances, it is up
651 * to the caller driver to create such links.
652 */
653 if (ntuner > 1)
654 tuner = NULL;
655 if (ndemod > 1)
656 demod = NULL;
657
658 if (create_rf_connector) {
659 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
660 if (!conn)
661 return -ENOMEM;
662 adap->conn = conn;
663
664 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
665 if (!adap->conn_pads)
666 return -ENOMEM;
667
668 conn->flags = MEDIA_ENT_FL_CONNECTOR;
669 conn->function = MEDIA_ENT_F_CONN_RF;
670 conn->name = connector_name;
671 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
672
673 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
674 if (ret)
675 return ret;
676
677 ret = media_device_register_entity(mdev, conn);
678 if (ret)
679 return ret;
680
681 if (!ntuner)
682 ret = media_create_pad_links(mdev,
683 MEDIA_ENT_F_CONN_RF,
684 conn, 0,
685 MEDIA_ENT_F_DTV_DEMOD,
686 demod, 0,
687 MEDIA_LNK_FL_ENABLED,
688 false);
689 else
690 ret = media_create_pad_links(mdev,
691 MEDIA_ENT_F_CONN_RF,
692 conn, 0,
693 MEDIA_ENT_F_TUNER,
694 tuner, TUNER_PAD_RF_INPUT,
695 MEDIA_LNK_FL_ENABLED,
696 false);
697 if (ret)
698 return ret;
699 }
700
701 if (ntuner && ndemod) {
702 ret = media_create_pad_links(mdev,
703 MEDIA_ENT_F_TUNER,
704 tuner, TUNER_PAD_OUTPUT,
705 MEDIA_ENT_F_DTV_DEMOD,
706 demod, 0, MEDIA_LNK_FL_ENABLED,
707 false);
708 if (ret)
709 return ret;
710 }
711
712 if (ndemod && demux) {
713 ret = media_create_pad_links(mdev,
714 MEDIA_ENT_F_DTV_DEMOD,
715 demod, 1,
716 MEDIA_ENT_F_TS_DEMUX,
717 demux, 0, MEDIA_LNK_FL_ENABLED,
718 false);
719 if (ret)
720 return ret;
721 }
722 if (demux && ca) {
723 ret = media_create_pad_link(demux, 1, ca,
724 0, MEDIA_LNK_FL_ENABLED);
725 if (ret)
726 return ret;
727 }
728
729 /* Create demux links for each ringbuffer/pad */
730 if (demux) {
731 media_device_for_each_entity(entity, mdev) {
732 if (entity->function == MEDIA_ENT_F_IO_DTV) {
733 if (!strncmp(entity->name, DVR_TSOUT,
734 strlen(DVR_TSOUT))) {
735 ret = media_create_pad_link(demux,
736 ++dvr_pad,
737 entity, 0, 0);
738 if (ret)
739 return ret;
740 }
741 if (!strncmp(entity->name, DEMUX_TSOUT,
742 strlen(DEMUX_TSOUT))) {
743 ret = media_create_pad_link(demux,
744 ++demux_pad,
745 entity, 0, 0);
746 if (ret)
747 return ret;
748 }
749 }
750 }
751 }
752
753 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
754 media_device_for_each_intf(intf, mdev) {
755 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
756 link = media_create_intf_link(ca, intf,
757 MEDIA_LNK_FL_ENABLED);
758 if (!link)
759 return -ENOMEM;
760 }
761
762 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
763 link = media_create_intf_link(tuner, intf,
764 MEDIA_LNK_FL_ENABLED);
765 if (!link)
766 return -ENOMEM;
767 }
768 #if 0
769 /*
770 * Indirect link - let's not create yet, as we don't know how
771 * to handle indirect links, nor if this will
772 * actually be needed.
773 */
774 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
775 link = media_create_intf_link(demux, intf,
776 MEDIA_LNK_FL_ENABLED);
777 if (!link)
778 return -ENOMEM;
779 }
780 #endif
781 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
782 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
783 if (ret)
784 return ret;
785 }
786 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
787 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
788 if (ret)
789 return ret;
790 }
791 }
792 return 0;
793 }
794 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
795 #endif
796
797 static int dvbdev_check_free_adapter_num(int num)
798 {
799 struct list_head *entry;
800 list_for_each(entry, &dvb_adapter_list) {
801 struct dvb_adapter *adap;
802 adap = list_entry(entry, struct dvb_adapter, list_head);
803 if (adap->num == num)
804 return 0;
805 }
806 return 1;
807 }
808
809 static int dvbdev_get_free_adapter_num (void)
810 {
811 int num = 0;
812
813 while (num < DVB_MAX_ADAPTERS) {
814 if (dvbdev_check_free_adapter_num(num))
815 return num;
816 num++;
817 }
818
819 return -ENFILE;
820 }
821
822
823 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
824 struct module *module, struct device *device,
825 short *adapter_nums)
826 {
827 int i, num;
828
829 mutex_lock(&dvbdev_register_lock);
830
831 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
832 num = adapter_nums[i];
833 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
834 /* use the one the driver asked for */
835 if (dvbdev_check_free_adapter_num(num))
836 break;
837 } else {
838 num = dvbdev_get_free_adapter_num();
839 break;
840 }
841 num = -1;
842 }
843
844 if (num < 0) {
845 mutex_unlock(&dvbdev_register_lock);
846 return -ENFILE;
847 }
848
849 memset (adap, 0, sizeof(struct dvb_adapter));
850 INIT_LIST_HEAD (&adap->device_list);
851
852 pr_info("DVB: registering new adapter (%s)\n", name);
853
854 adap->num = num;
855 adap->name = name;
856 adap->module = module;
857 adap->device = device;
858 adap->mfe_shared = 0;
859 adap->mfe_dvbdev = NULL;
860 mutex_init (&adap->mfe_lock);
861
862 list_add_tail (&adap->list_head, &dvb_adapter_list);
863
864 mutex_unlock(&dvbdev_register_lock);
865
866 return num;
867 }
868 EXPORT_SYMBOL(dvb_register_adapter);
869
870
871 int dvb_unregister_adapter(struct dvb_adapter *adap)
872 {
873 mutex_lock(&dvbdev_register_lock);
874 list_del (&adap->list_head);
875 mutex_unlock(&dvbdev_register_lock);
876 return 0;
877 }
878 EXPORT_SYMBOL(dvb_unregister_adapter);
879
880 /* if the miracle happens and "generic_usercopy()" is included into
881 the kernel, then this can vanish. please don't make the mistake and
882 define this as video_usercopy(). this will introduce a dependecy
883 to the v4l "videodev.o" module, which is unnecessary for some
884 cards (ie. the budget dvb-cards don't need the v4l module...) */
885 int dvb_usercopy(struct file *file,
886 unsigned int cmd, unsigned long arg,
887 int (*func)(struct file *file,
888 unsigned int cmd, void *arg))
889 {
890 char sbuf[128];
891 void *mbuf = NULL;
892 void *parg = NULL;
893 int err = -EINVAL;
894
895 /* Copy arguments into temp kernel buffer */
896 switch (_IOC_DIR(cmd)) {
897 case _IOC_NONE:
898 /*
899 * For this command, the pointer is actually an integer
900 * argument.
901 */
902 parg = (void *) arg;
903 break;
904 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
905 case _IOC_WRITE:
906 case (_IOC_WRITE | _IOC_READ):
907 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
908 parg = sbuf;
909 } else {
910 /* too big to allocate from stack */
911 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
912 if (NULL == mbuf)
913 return -ENOMEM;
914 parg = mbuf;
915 }
916
917 err = -EFAULT;
918 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
919 goto out;
920 break;
921 }
922
923 /* call driver */
924 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
925 err = -ENOTTY;
926
927 if (err < 0)
928 goto out;
929
930 /* Copy results into user buffer */
931 switch (_IOC_DIR(cmd))
932 {
933 case _IOC_READ:
934 case (_IOC_WRITE | _IOC_READ):
935 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
936 err = -EFAULT;
937 break;
938 }
939
940 out:
941 kfree(mbuf);
942 return err;
943 }
944
945 #if IS_ENABLED(CONFIG_I2C)
946 struct i2c_client *dvb_module_probe(const char *module_name,
947 const char *name,
948 struct i2c_adapter *adap,
949 unsigned char addr,
950 void *platform_data)
951 {
952 struct i2c_client *client;
953 struct i2c_board_info *board_info;
954
955 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
956 if (!board_info)
957 return NULL;
958
959 if (name)
960 strlcpy(board_info->type, name, I2C_NAME_SIZE);
961 else
962 strlcpy(board_info->type, module_name, I2C_NAME_SIZE);
963
964 board_info->addr = addr;
965 board_info->platform_data = platform_data;
966 request_module(module_name);
967 client = i2c_new_device(adap, board_info);
968 if (client == NULL || client->dev.driver == NULL) {
969 kfree(board_info);
970 return NULL;
971 }
972
973 if (!try_module_get(client->dev.driver->owner)) {
974 i2c_unregister_device(client);
975 client = NULL;
976 }
977
978 kfree(board_info);
979 return client;
980 }
981 EXPORT_SYMBOL_GPL(dvb_module_probe);
982
983 void dvb_module_release(struct i2c_client *client)
984 {
985 if (!client)
986 return;
987
988 module_put(client->dev.driver->owner);
989 i2c_unregister_device(client);
990 }
991 EXPORT_SYMBOL_GPL(dvb_module_release);
992 #endif
993
994 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
995 {
996 struct dvb_device *dvbdev = dev_get_drvdata(dev);
997
998 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
999 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1000 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1001 return 0;
1002 }
1003
1004 static char *dvb_devnode(struct device *dev, umode_t *mode)
1005 {
1006 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1007
1008 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1009 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1010 }
1011
1012
1013 static int __init init_dvbdev(void)
1014 {
1015 int retval;
1016 dev_t dev = MKDEV(DVB_MAJOR, 0);
1017
1018 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1019 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1020 return retval;
1021 }
1022
1023 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1024 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1025 pr_err("dvb-core: unable register character device\n");
1026 goto error;
1027 }
1028
1029 dvb_class = class_create(THIS_MODULE, "dvb");
1030 if (IS_ERR(dvb_class)) {
1031 retval = PTR_ERR(dvb_class);
1032 goto error;
1033 }
1034 dvb_class->dev_uevent = dvb_uevent;
1035 dvb_class->devnode = dvb_devnode;
1036 return 0;
1037
1038 error:
1039 cdev_del(&dvb_device_cdev);
1040 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1041 return retval;
1042 }
1043
1044
1045 static void __exit exit_dvbdev(void)
1046 {
1047 class_destroy(dvb_class);
1048 cdev_del(&dvb_device_cdev);
1049 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1050 }
1051
1052 subsys_initcall(init_dvbdev);
1053 module_exit(exit_dvbdev);
1054
1055 MODULE_DESCRIPTION("DVB Core Driver");
1056 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1057 MODULE_LICENSE("GPL");
Linux with added FPC-III support