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 LIST_HEAD(dvbdevfops_list);
41 static int dvbdev_debug;
42
43 module_param(dvbdev_debug, int, 0644);
44 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
45
46 #define dprintk(fmt, arg...) do { \
47 if (dvbdev_debug) \
48 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
49 __func__, ##arg); \
50 } while (0)
51
52 static LIST_HEAD(dvb_adapter_list);
53 static DEFINE_MUTEX(dvbdev_register_lock);
54
55 static const char * const dnames[] = {
56 [DVB_DEVICE_VIDEO] = "video",
57 [DVB_DEVICE_AUDIO] = "audio",
58 [DVB_DEVICE_SEC] = "sec",
59 [DVB_DEVICE_FRONTEND] = "frontend",
60 [DVB_DEVICE_DEMUX] = "demux",
61 [DVB_DEVICE_DVR] = "dvr",
62 [DVB_DEVICE_CA] = "ca",
63 [DVB_DEVICE_NET] = "net",
64 [DVB_DEVICE_OSD] = "osd"
65 };
66
67 #ifdef CONFIG_DVB_DYNAMIC_MINORS
68 #define MAX_DVB_MINORS 256
69 #define DVB_MAX_IDS MAX_DVB_MINORS
70 #else
71 #define DVB_MAX_IDS 4
72
73 static const u8 minor_type[] = {
74 [DVB_DEVICE_VIDEO] = 0,
75 [DVB_DEVICE_AUDIO] = 1,
76 [DVB_DEVICE_SEC] = 2,
77 [DVB_DEVICE_FRONTEND] = 3,
78 [DVB_DEVICE_DEMUX] = 4,
79 [DVB_DEVICE_DVR] = 5,
80 [DVB_DEVICE_CA] = 6,
81 [DVB_DEVICE_NET] = 7,
82 [DVB_DEVICE_OSD] = 8,
83 };
84
85 #define nums2minor(num, type, id) \
86 (((num) << 6) | ((id) << 4) | minor_type[type])
87
88 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
89 #endif
90
91 static struct class *dvb_class;
92
93 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
94 static DECLARE_RWSEM(minor_rwsem);
95
dvb_device_open(struct inode * inode,struct file * file)96 static int dvb_device_open(struct inode *inode, struct file *file)
97 {
98 struct dvb_device *dvbdev;
99
100 mutex_lock(&dvbdev_mutex);
101 down_read(&minor_rwsem);
102 dvbdev = dvb_minors[iminor(inode)];
103
104 if (dvbdev && dvbdev->fops) {
105 int err = 0;
106 const struct file_operations *new_fops;
107
108 new_fops = fops_get(dvbdev->fops);
109 if (!new_fops)
110 goto fail;
111 file->private_data = dvbdev;
112 replace_fops(file, new_fops);
113 if (file->f_op->open)
114 err = file->f_op->open(inode, file);
115 up_read(&minor_rwsem);
116 mutex_unlock(&dvbdev_mutex);
117 return err;
118 }
119 fail:
120 up_read(&minor_rwsem);
121 mutex_unlock(&dvbdev_mutex);
122 return -ENODEV;
123 }
124
125
126 static const struct file_operations dvb_device_fops =
127 {
128 .owner = THIS_MODULE,
129 .open = dvb_device_open,
130 .llseek = noop_llseek,
131 };
132
133 static struct cdev dvb_device_cdev;
134
dvb_generic_open(struct inode * inode,struct file * file)135 int dvb_generic_open(struct inode *inode, struct file *file)
136 {
137 struct dvb_device *dvbdev = file->private_data;
138
139 if (!dvbdev)
140 return -ENODEV;
141
142 if (!dvbdev->users)
143 return -EBUSY;
144
145 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
146 if (!dvbdev->readers)
147 return -EBUSY;
148 dvbdev->readers--;
149 } else {
150 if (!dvbdev->writers)
151 return -EBUSY;
152 dvbdev->writers--;
153 }
154
155 dvbdev->users--;
156 return 0;
157 }
158 EXPORT_SYMBOL(dvb_generic_open);
159
160
dvb_generic_release(struct inode * inode,struct file * file)161 int dvb_generic_release(struct inode *inode, struct file *file)
162 {
163 struct dvb_device *dvbdev = file->private_data;
164
165 if (!dvbdev)
166 return -ENODEV;
167
168 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
169 dvbdev->readers++;
170 } else {
171 dvbdev->writers++;
172 }
173
174 dvbdev->users++;
175 return 0;
176 }
177 EXPORT_SYMBOL(dvb_generic_release);
178
179
dvb_generic_ioctl(struct file * file,unsigned int cmd,unsigned long arg)180 long dvb_generic_ioctl(struct file *file,
181 unsigned int cmd, unsigned long arg)
182 {
183 struct dvb_device *dvbdev = file->private_data;
184
185 if (!dvbdev)
186 return -ENODEV;
187
188 if (!dvbdev->kernel_ioctl)
189 return -EINVAL;
190
191 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
192 }
193 EXPORT_SYMBOL(dvb_generic_ioctl);
194
195
dvbdev_get_free_id(struct dvb_adapter * adap,int type)196 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
197 {
198 u32 id = 0;
199
200 while (id < DVB_MAX_IDS) {
201 struct dvb_device *dev;
202 list_for_each_entry(dev, &adap->device_list, list_head)
203 if (dev->type == type && dev->id == id)
204 goto skip;
205 return id;
206 skip:
207 id++;
208 }
209 return -ENFILE;
210 }
211
dvb_media_device_free(struct dvb_device * dvbdev)212 static void dvb_media_device_free(struct dvb_device *dvbdev)
213 {
214 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
215 if (dvbdev->entity) {
216 media_device_unregister_entity(dvbdev->entity);
217 kfree(dvbdev->entity);
218 kfree(dvbdev->pads);
219 dvbdev->entity = NULL;
220 dvbdev->pads = NULL;
221 }
222
223 if (dvbdev->tsout_entity) {
224 int i;
225
226 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
227 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
228 kfree(dvbdev->tsout_entity[i].name);
229 }
230 kfree(dvbdev->tsout_entity);
231 kfree(dvbdev->tsout_pads);
232 dvbdev->tsout_entity = NULL;
233 dvbdev->tsout_pads = NULL;
234
235 dvbdev->tsout_num_entities = 0;
236 }
237
238 if (dvbdev->intf_devnode) {
239 media_devnode_remove(dvbdev->intf_devnode);
240 dvbdev->intf_devnode = NULL;
241 }
242
243 if (dvbdev->adapter->conn) {
244 media_device_unregister_entity(dvbdev->adapter->conn);
245 kfree(dvbdev->adapter->conn);
246 dvbdev->adapter->conn = NULL;
247 kfree(dvbdev->adapter->conn_pads);
248 dvbdev->adapter->conn_pads = NULL;
249 }
250 #endif
251 }
252
253 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
dvb_create_tsout_entity(struct dvb_device * dvbdev,const char * name,int npads)254 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
255 const char *name, int npads)
256 {
257 int i, ret = 0;
258
259 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
260 GFP_KERNEL);
261 if (!dvbdev->tsout_pads)
262 return -ENOMEM;
263
264 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
265 GFP_KERNEL);
266 if (!dvbdev->tsout_entity)
267 return -ENOMEM;
268
269 dvbdev->tsout_num_entities = npads;
270
271 for (i = 0; i < npads; i++) {
272 struct media_pad *pads = &dvbdev->tsout_pads[i];
273 struct media_entity *entity = &dvbdev->tsout_entity[i];
274
275 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
276 if (!entity->name)
277 return -ENOMEM;
278
279 entity->function = MEDIA_ENT_F_IO_DTV;
280 pads->flags = MEDIA_PAD_FL_SINK;
281
282 ret = media_entity_pads_init(entity, 1, pads);
283 if (ret < 0)
284 return ret;
285
286 ret = media_device_register_entity(dvbdev->adapter->mdev,
287 entity);
288 if (ret < 0)
289 return ret;
290 }
291 return 0;
292 }
293
294 #define DEMUX_TSOUT "demux-tsout"
295 #define DVR_TSOUT "dvr-tsout"
296
dvb_create_media_entity(struct dvb_device * dvbdev,int type,int demux_sink_pads)297 static int dvb_create_media_entity(struct dvb_device *dvbdev,
298 int type, int demux_sink_pads)
299 {
300 int i, ret, npads;
301
302 switch (type) {
303 case DVB_DEVICE_FRONTEND:
304 npads = 2;
305 break;
306 case DVB_DEVICE_DVR:
307 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
308 demux_sink_pads);
309 return ret;
310 case DVB_DEVICE_DEMUX:
311 npads = 1 + demux_sink_pads;
312 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
313 demux_sink_pads);
314 if (ret < 0)
315 return ret;
316 break;
317 case DVB_DEVICE_CA:
318 npads = 2;
319 break;
320 case DVB_DEVICE_NET:
321 /*
322 * We should be creating entities for the MPE/ULE
323 * decapsulation hardware (or software implementation).
324 *
325 * However, the number of for the MPE/ULE decaps may not be
326 * fixed. As we don't have yet dynamic support for PADs at
327 * the Media Controller, let's not create the decap
328 * entities yet.
329 */
330 return 0;
331 default:
332 return 0;
333 }
334
335 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
336 if (!dvbdev->entity)
337 return -ENOMEM;
338
339 dvbdev->entity->name = dvbdev->name;
340
341 if (npads) {
342 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
343 GFP_KERNEL);
344 if (!dvbdev->pads) {
345 kfree(dvbdev->entity);
346 return -ENOMEM;
347 }
348 }
349
350 switch (type) {
351 case DVB_DEVICE_FRONTEND:
352 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
353 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
354 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
355 break;
356 case DVB_DEVICE_DEMUX:
357 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
358 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
359 for (i = 1; i < npads; i++)
360 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
361 break;
362 case DVB_DEVICE_CA:
363 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
364 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
365 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
366 break;
367 default:
368 /* Should never happen, as the first switch prevents it */
369 kfree(dvbdev->entity);
370 kfree(dvbdev->pads);
371 dvbdev->entity = NULL;
372 dvbdev->pads = NULL;
373 return 0;
374 }
375
376 if (npads) {
377 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
378 if (ret)
379 return ret;
380 }
381 ret = media_device_register_entity(dvbdev->adapter->mdev,
382 dvbdev->entity);
383 if (ret)
384 return ret;
385
386 pr_info("%s: media entity '%s' registered.\n",
387 __func__, dvbdev->entity->name);
388
389 return 0;
390 }
391 #endif
392
dvb_register_media_device(struct dvb_device * dvbdev,int type,int minor,unsigned demux_sink_pads)393 static int dvb_register_media_device(struct dvb_device *dvbdev,
394 int type, int minor,
395 unsigned demux_sink_pads)
396 {
397 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
398 struct media_link *link;
399 u32 intf_type;
400 int ret;
401
402 if (!dvbdev->adapter->mdev)
403 return 0;
404
405 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
406 if (ret)
407 return ret;
408
409 switch (type) {
410 case DVB_DEVICE_FRONTEND:
411 intf_type = MEDIA_INTF_T_DVB_FE;
412 break;
413 case DVB_DEVICE_DEMUX:
414 intf_type = MEDIA_INTF_T_DVB_DEMUX;
415 break;
416 case DVB_DEVICE_DVR:
417 intf_type = MEDIA_INTF_T_DVB_DVR;
418 break;
419 case DVB_DEVICE_CA:
420 intf_type = MEDIA_INTF_T_DVB_CA;
421 break;
422 case DVB_DEVICE_NET:
423 intf_type = MEDIA_INTF_T_DVB_NET;
424 break;
425 default:
426 return 0;
427 }
428
429 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
430 intf_type, 0,
431 DVB_MAJOR, minor);
432
433 if (!dvbdev->intf_devnode)
434 return -ENOMEM;
435
436 /*
437 * Create the "obvious" link, e. g. the ones that represent
438 * a direct association between an interface and an entity.
439 * Other links should be created elsewhere, like:
440 * DVB FE intf -> tuner
441 * DVB demux intf -> dvr
442 */
443
444 if (!dvbdev->entity)
445 return 0;
446
447 link = media_create_intf_link(dvbdev->entity,
448 &dvbdev->intf_devnode->intf,
449 MEDIA_LNK_FL_ENABLED |
450 MEDIA_LNK_FL_IMMUTABLE);
451 if (!link)
452 return -ENOMEM;
453 #endif
454 return 0;
455 }
456
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)457 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
458 const struct dvb_device *template, void *priv,
459 enum dvb_device_type type, int demux_sink_pads)
460 {
461 struct dvb_device *dvbdev;
462 struct file_operations *dvbdevfops = NULL;
463 struct dvbdevfops_node *node = NULL, *new_node = NULL;
464 struct device *clsdev;
465 int minor;
466 int id, ret;
467
468 mutex_lock(&dvbdev_register_lock);
469
470 if ((id = dvbdev_get_free_id (adap, type)) < 0) {
471 mutex_unlock(&dvbdev_register_lock);
472 *pdvbdev = NULL;
473 pr_err("%s: couldn't find free device id\n", __func__);
474 return -ENFILE;
475 }
476
477 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
478 if (!dvbdev){
479 mutex_unlock(&dvbdev_register_lock);
480 return -ENOMEM;
481 }
482
483 /*
484 * When a device of the same type is probe()d more than once,
485 * the first allocated fops are used. This prevents memory leaks
486 * that can occur when the same device is probe()d repeatedly.
487 */
488 list_for_each_entry(node, &dvbdevfops_list, list_head) {
489 if (node->fops->owner == adap->module &&
490 node->type == type &&
491 node->template == template) {
492 dvbdevfops = node->fops;
493 break;
494 }
495 }
496
497 if (dvbdevfops == NULL) {
498 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
499 if (!dvbdevfops) {
500 kfree(dvbdev);
501 mutex_unlock(&dvbdev_register_lock);
502 return -ENOMEM;
503 }
504
505 new_node = kzalloc(sizeof(struct dvbdevfops_node), GFP_KERNEL);
506 if (!new_node) {
507 kfree(dvbdevfops);
508 kfree(dvbdev);
509 mutex_unlock(&dvbdev_register_lock);
510 return -ENOMEM;
511 }
512
513 new_node->fops = dvbdevfops;
514 new_node->type = type;
515 new_node->template = template;
516 list_add_tail (&new_node->list_head, &dvbdevfops_list);
517 }
518
519 memcpy(dvbdev, template, sizeof(struct dvb_device));
520 dvbdev->type = type;
521 dvbdev->id = id;
522 dvbdev->adapter = adap;
523 dvbdev->priv = priv;
524 dvbdev->fops = dvbdevfops;
525 init_waitqueue_head (&dvbdev->wait_queue);
526 dvbdevfops->owner = adap->module;
527 list_add_tail (&dvbdev->list_head, &adap->device_list);
528 down_write(&minor_rwsem);
529 #ifdef CONFIG_DVB_DYNAMIC_MINORS
530 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
531 if (dvb_minors[minor] == NULL)
532 break;
533 if (minor == MAX_DVB_MINORS) {
534 if (new_node) {
535 list_del (&new_node->list_head);
536 kfree(dvbdevfops);
537 kfree(new_node);
538 }
539 list_del (&dvbdev->list_head);
540 kfree(dvbdev);
541 up_write(&minor_rwsem);
542 mutex_unlock(&dvbdev_register_lock);
543 return -EINVAL;
544 }
545 #else
546 minor = nums2minor(adap->num, type, id);
547 #endif
548 dvbdev->minor = minor;
549 dvb_minors[minor] = dvbdev;
550 up_write(&minor_rwsem);
551 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
552 if (ret) {
553 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
554 __func__);
555 if (new_node) {
556 list_del (&new_node->list_head);
557 kfree(dvbdevfops);
558 kfree(new_node);
559 }
560 dvb_media_device_free(dvbdev);
561 list_del (&dvbdev->list_head);
562 kfree(dvbdev);
563 mutex_unlock(&dvbdev_register_lock);
564 return ret;
565 }
566
567 clsdev = device_create(dvb_class, adap->device,
568 MKDEV(DVB_MAJOR, minor),
569 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
570 if (IS_ERR(clsdev)) {
571 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
572 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
573 if (new_node) {
574 list_del (&new_node->list_head);
575 kfree(dvbdevfops);
576 kfree(new_node);
577 }
578 dvb_media_device_free(dvbdev);
579 list_del (&dvbdev->list_head);
580 kfree(dvbdev);
581 mutex_unlock(&dvbdev_register_lock);
582 return PTR_ERR(clsdev);
583 }
584
585 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
586 adap->num, dnames[type], id, minor, minor);
587
588 mutex_unlock(&dvbdev_register_lock);
589 return 0;
590 }
591 EXPORT_SYMBOL(dvb_register_device);
592
593
dvb_remove_device(struct dvb_device * dvbdev)594 void dvb_remove_device(struct dvb_device *dvbdev)
595 {
596 if (!dvbdev)
597 return;
598
599 down_write(&minor_rwsem);
600 dvb_minors[dvbdev->minor] = NULL;
601 up_write(&minor_rwsem);
602
603 dvb_media_device_free(dvbdev);
604
605 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
606
607 list_del (&dvbdev->list_head);
608 }
609 EXPORT_SYMBOL(dvb_remove_device);
610
611
dvb_free_device(struct dvb_device * dvbdev)612 void dvb_free_device(struct dvb_device *dvbdev)
613 {
614 if (!dvbdev)
615 return;
616
617 kfree (dvbdev);
618 }
619 EXPORT_SYMBOL(dvb_free_device);
620
621
dvb_unregister_device(struct dvb_device * dvbdev)622 void dvb_unregister_device(struct dvb_device *dvbdev)
623 {
624 dvb_remove_device(dvbdev);
625 dvb_free_device(dvbdev);
626 }
627 EXPORT_SYMBOL(dvb_unregister_device);
628
629
630 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
631
dvb_create_io_intf_links(struct dvb_adapter * adap,struct media_interface * intf,char * name)632 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
633 struct media_interface *intf,
634 char *name)
635 {
636 struct media_device *mdev = adap->mdev;
637 struct media_entity *entity;
638 struct media_link *link;
639
640 media_device_for_each_entity(entity, mdev) {
641 if (entity->function == MEDIA_ENT_F_IO_DTV) {
642 if (strncmp(entity->name, name, strlen(name)))
643 continue;
644 link = media_create_intf_link(entity, intf,
645 MEDIA_LNK_FL_ENABLED |
646 MEDIA_LNK_FL_IMMUTABLE);
647 if (!link)
648 return -ENOMEM;
649 }
650 }
651 return 0;
652 }
653
dvb_create_media_graph(struct dvb_adapter * adap,bool create_rf_connector)654 int dvb_create_media_graph(struct dvb_adapter *adap,
655 bool create_rf_connector)
656 {
657 struct media_device *mdev = adap->mdev;
658 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
659 struct media_entity *demux = NULL, *ca = NULL;
660 struct media_link *link;
661 struct media_interface *intf;
662 unsigned demux_pad = 0;
663 unsigned dvr_pad = 0;
664 unsigned ntuner = 0, ndemod = 0;
665 int ret, pad_source, pad_sink;
666 static const char *connector_name = "Television";
667
668 if (!mdev)
669 return 0;
670
671 media_device_for_each_entity(entity, mdev) {
672 switch (entity->function) {
673 case MEDIA_ENT_F_TUNER:
674 tuner = entity;
675 ntuner++;
676 break;
677 case MEDIA_ENT_F_DTV_DEMOD:
678 demod = entity;
679 ndemod++;
680 break;
681 case MEDIA_ENT_F_TS_DEMUX:
682 demux = entity;
683 break;
684 case MEDIA_ENT_F_DTV_CA:
685 ca = entity;
686 break;
687 }
688 }
689
690 /*
691 * Prepare to signalize to media_create_pad_links() that multiple
692 * entities of the same type exists and a 1:n or n:1 links need to be
693 * created.
694 * NOTE: if both tuner and demod have multiple instances, it is up
695 * to the caller driver to create such links.
696 */
697 if (ntuner > 1)
698 tuner = NULL;
699 if (ndemod > 1)
700 demod = NULL;
701
702 if (create_rf_connector) {
703 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
704 if (!conn)
705 return -ENOMEM;
706 adap->conn = conn;
707
708 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
709 if (!adap->conn_pads)
710 return -ENOMEM;
711
712 conn->flags = MEDIA_ENT_FL_CONNECTOR;
713 conn->function = MEDIA_ENT_F_CONN_RF;
714 conn->name = connector_name;
715 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
716
717 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
718 if (ret)
719 return ret;
720
721 ret = media_device_register_entity(mdev, conn);
722 if (ret)
723 return ret;
724
725 if (!ntuner) {
726 ret = media_create_pad_links(mdev,
727 MEDIA_ENT_F_CONN_RF,
728 conn, 0,
729 MEDIA_ENT_F_DTV_DEMOD,
730 demod, 0,
731 MEDIA_LNK_FL_ENABLED,
732 false);
733 } else {
734 pad_sink = media_get_pad_index(tuner, true,
735 PAD_SIGNAL_ANALOG);
736 if (pad_sink < 0)
737 return -EINVAL;
738 ret = media_create_pad_links(mdev,
739 MEDIA_ENT_F_CONN_RF,
740 conn, 0,
741 MEDIA_ENT_F_TUNER,
742 tuner, pad_sink,
743 MEDIA_LNK_FL_ENABLED,
744 false);
745 }
746 if (ret)
747 return ret;
748 }
749
750 if (ntuner && ndemod) {
751 /* NOTE: first found tuner source pad presumed correct */
752 pad_source = media_get_pad_index(tuner, false,
753 PAD_SIGNAL_ANALOG);
754 if (pad_source < 0)
755 return -EINVAL;
756 ret = media_create_pad_links(mdev,
757 MEDIA_ENT_F_TUNER,
758 tuner, pad_source,
759 MEDIA_ENT_F_DTV_DEMOD,
760 demod, 0, MEDIA_LNK_FL_ENABLED,
761 false);
762 if (ret)
763 return ret;
764 }
765
766 if (ndemod && demux) {
767 ret = media_create_pad_links(mdev,
768 MEDIA_ENT_F_DTV_DEMOD,
769 demod, 1,
770 MEDIA_ENT_F_TS_DEMUX,
771 demux, 0, MEDIA_LNK_FL_ENABLED,
772 false);
773 if (ret)
774 return ret;
775 }
776 if (demux && ca) {
777 ret = media_create_pad_link(demux, 1, ca,
778 0, MEDIA_LNK_FL_ENABLED);
779 if (ret)
780 return ret;
781 }
782
783 /* Create demux links for each ringbuffer/pad */
784 if (demux) {
785 media_device_for_each_entity(entity, mdev) {
786 if (entity->function == MEDIA_ENT_F_IO_DTV) {
787 if (!strncmp(entity->name, DVR_TSOUT,
788 strlen(DVR_TSOUT))) {
789 ret = media_create_pad_link(demux,
790 ++dvr_pad,
791 entity, 0, 0);
792 if (ret)
793 return ret;
794 }
795 if (!strncmp(entity->name, DEMUX_TSOUT,
796 strlen(DEMUX_TSOUT))) {
797 ret = media_create_pad_link(demux,
798 ++demux_pad,
799 entity, 0, 0);
800 if (ret)
801 return ret;
802 }
803 }
804 }
805 }
806
807 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
808 media_device_for_each_intf(intf, mdev) {
809 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
810 link = media_create_intf_link(ca, intf,
811 MEDIA_LNK_FL_ENABLED |
812 MEDIA_LNK_FL_IMMUTABLE);
813 if (!link)
814 return -ENOMEM;
815 }
816
817 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
818 link = media_create_intf_link(tuner, intf,
819 MEDIA_LNK_FL_ENABLED |
820 MEDIA_LNK_FL_IMMUTABLE);
821 if (!link)
822 return -ENOMEM;
823 }
824 #if 0
825 /*
826 * Indirect link - let's not create yet, as we don't know how
827 * to handle indirect links, nor if this will
828 * actually be needed.
829 */
830 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
831 link = media_create_intf_link(demux, intf,
832 MEDIA_LNK_FL_ENABLED |
833 MEDIA_LNK_FL_IMMUTABLE);
834 if (!link)
835 return -ENOMEM;
836 }
837 #endif
838 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
839 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
840 if (ret)
841 return ret;
842 }
843 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
844 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
845 if (ret)
846 return ret;
847 }
848 }
849 return 0;
850 }
851 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
852 #endif
853
dvbdev_check_free_adapter_num(int num)854 static int dvbdev_check_free_adapter_num(int num)
855 {
856 struct list_head *entry;
857 list_for_each(entry, &dvb_adapter_list) {
858 struct dvb_adapter *adap;
859 adap = list_entry(entry, struct dvb_adapter, list_head);
860 if (adap->num == num)
861 return 0;
862 }
863 return 1;
864 }
865
dvbdev_get_free_adapter_num(void)866 static int dvbdev_get_free_adapter_num (void)
867 {
868 int num = 0;
869
870 while (num < DVB_MAX_ADAPTERS) {
871 if (dvbdev_check_free_adapter_num(num))
872 return num;
873 num++;
874 }
875
876 return -ENFILE;
877 }
878
879
dvb_register_adapter(struct dvb_adapter * adap,const char * name,struct module * module,struct device * device,short * adapter_nums)880 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
881 struct module *module, struct device *device,
882 short *adapter_nums)
883 {
884 int i, num;
885
886 mutex_lock(&dvbdev_register_lock);
887
888 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
889 num = adapter_nums[i];
890 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
891 /* use the one the driver asked for */
892 if (dvbdev_check_free_adapter_num(num))
893 break;
894 } else {
895 num = dvbdev_get_free_adapter_num();
896 break;
897 }
898 num = -1;
899 }
900
901 if (num < 0) {
902 mutex_unlock(&dvbdev_register_lock);
903 return -ENFILE;
904 }
905
906 memset (adap, 0, sizeof(struct dvb_adapter));
907 INIT_LIST_HEAD (&adap->device_list);
908
909 pr_info("DVB: registering new adapter (%s)\n", name);
910
911 adap->num = num;
912 adap->name = name;
913 adap->module = module;
914 adap->device = device;
915 adap->mfe_shared = 0;
916 adap->mfe_dvbdev = NULL;
917 mutex_init (&adap->mfe_lock);
918
919 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
920 mutex_init(&adap->mdev_lock);
921 #endif
922
923 list_add_tail (&adap->list_head, &dvb_adapter_list);
924
925 mutex_unlock(&dvbdev_register_lock);
926
927 return num;
928 }
929 EXPORT_SYMBOL(dvb_register_adapter);
930
931
dvb_unregister_adapter(struct dvb_adapter * adap)932 int dvb_unregister_adapter(struct dvb_adapter *adap)
933 {
934 mutex_lock(&dvbdev_register_lock);
935 list_del (&adap->list_head);
936 mutex_unlock(&dvbdev_register_lock);
937 return 0;
938 }
939 EXPORT_SYMBOL(dvb_unregister_adapter);
940
941 /* if the miracle happens and "generic_usercopy()" is included into
942 the kernel, then this can vanish. please don't make the mistake and
943 define this as video_usercopy(). this will introduce a dependency
944 to the v4l "videodev.o" module, which is unnecessary for some
945 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))946 int dvb_usercopy(struct file *file,
947 unsigned int cmd, unsigned long arg,
948 int (*func)(struct file *file,
949 unsigned int cmd, void *arg))
950 {
951 char sbuf[128];
952 void *mbuf = NULL;
953 void *parg = NULL;
954 int err = -EINVAL;
955
956 /* Copy arguments into temp kernel buffer */
957 switch (_IOC_DIR(cmd)) {
958 case _IOC_NONE:
959 /*
960 * For this command, the pointer is actually an integer
961 * argument.
962 */
963 parg = (void *) arg;
964 break;
965 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
966 case _IOC_WRITE:
967 case (_IOC_WRITE | _IOC_READ):
968 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
969 parg = sbuf;
970 } else {
971 /* too big to allocate from stack */
972 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
973 if (NULL == mbuf)
974 return -ENOMEM;
975 parg = mbuf;
976 }
977
978 err = -EFAULT;
979 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
980 goto out;
981 break;
982 }
983
984 /* call driver */
985 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
986 err = -ENOTTY;
987
988 if (err < 0)
989 goto out;
990
991 /* Copy results into user buffer */
992 switch (_IOC_DIR(cmd))
993 {
994 case _IOC_READ:
995 case (_IOC_WRITE | _IOC_READ):
996 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
997 err = -EFAULT;
998 break;
999 }
1000
1001 out:
1002 kfree(mbuf);
1003 return err;
1004 }
1005
1006 #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)1007 struct i2c_client *dvb_module_probe(const char *module_name,
1008 const char *name,
1009 struct i2c_adapter *adap,
1010 unsigned char addr,
1011 void *platform_data)
1012 {
1013 struct i2c_client *client;
1014 struct i2c_board_info *board_info;
1015
1016 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
1017 if (!board_info)
1018 return NULL;
1019
1020 if (name)
1021 strscpy(board_info->type, name, I2C_NAME_SIZE);
1022 else
1023 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1024
1025 board_info->addr = addr;
1026 board_info->platform_data = platform_data;
1027 request_module(module_name);
1028 client = i2c_new_client_device(adap, board_info);
1029 if (!i2c_client_has_driver(client)) {
1030 kfree(board_info);
1031 return NULL;
1032 }
1033
1034 if (!try_module_get(client->dev.driver->owner)) {
1035 i2c_unregister_device(client);
1036 client = NULL;
1037 }
1038
1039 kfree(board_info);
1040 return client;
1041 }
1042 EXPORT_SYMBOL_GPL(dvb_module_probe);
1043
dvb_module_release(struct i2c_client * client)1044 void dvb_module_release(struct i2c_client *client)
1045 {
1046 if (!client)
1047 return;
1048
1049 module_put(client->dev.driver->owner);
1050 i2c_unregister_device(client);
1051 }
1052 EXPORT_SYMBOL_GPL(dvb_module_release);
1053 #endif
1054
dvb_uevent(struct device * dev,struct kobj_uevent_env * env)1055 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1056 {
1057 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1058
1059 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1060 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1061 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1062 return 0;
1063 }
1064
dvb_devnode(struct device * dev,umode_t * mode)1065 static char *dvb_devnode(struct device *dev, umode_t *mode)
1066 {
1067 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1068
1069 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1070 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1071 }
1072
1073
init_dvbdev(void)1074 static int __init init_dvbdev(void)
1075 {
1076 int retval;
1077 dev_t dev = MKDEV(DVB_MAJOR, 0);
1078
1079 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1080 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1081 return retval;
1082 }
1083
1084 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1085 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1086 pr_err("dvb-core: unable register character device\n");
1087 goto error;
1088 }
1089
1090 dvb_class = class_create(THIS_MODULE, "dvb");
1091 if (IS_ERR(dvb_class)) {
1092 retval = PTR_ERR(dvb_class);
1093 goto error;
1094 }
1095 dvb_class->dev_uevent = dvb_uevent;
1096 dvb_class->devnode = dvb_devnode;
1097 return 0;
1098
1099 error:
1100 cdev_del(&dvb_device_cdev);
1101 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1102 return retval;
1103 }
1104
1105
exit_dvbdev(void)1106 static void __exit exit_dvbdev(void)
1107 {
1108 struct dvbdevfops_node *node, *next;
1109
1110 class_destroy(dvb_class);
1111 cdev_del(&dvb_device_cdev);
1112 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1113
1114 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
1115 list_del (&node->list_head);
1116 kfree(node->fops);
1117 kfree(node);
1118 }
1119 }
1120
1121 subsys_initcall(init_dvbdev);
1122 module_exit(exit_dvbdev);
1123
1124 MODULE_DESCRIPTION("DVB Core Driver");
1125 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1126 MODULE_LICENSE("GPL");
1127