1 // SPDX-License-Identifier: LGPL-2.1-or-later
2 /*
3 * dvbdev.c
4 *
5 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>
6 * & Marcus Metzler <marcus@convergence.de>
7 * for convergence integrated media GmbH
8 */
9
10 #define pr_fmt(fmt) "dvbdev: " fmt
11
12 #include <linux/types.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/i2c.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/device.h>
21 #include <linux/fs.h>
22 #include <linux/cdev.h>
23 #include <linux/mutex.h>
24 #include <media/dvbdev.h>
25
26 /* Due to enum tuner_pad_index */
27 #include <media/tuner.h>
28
29 static DEFINE_MUTEX(dvbdev_mutex);
30 static LIST_HEAD(dvbdevfops_list);
31 static int dvbdev_debug;
32
33 module_param(dvbdev_debug, int, 0644);
34 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
35
36 #define dprintk(fmt, arg...) do { \
37 if (dvbdev_debug) \
38 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
39 __func__, ##arg); \
40 } while (0)
41
42 static LIST_HEAD(dvb_adapter_list);
43 static DEFINE_MUTEX(dvbdev_register_lock);
44
45 static const char * const dnames[] = {
46 [DVB_DEVICE_VIDEO] = "video",
47 [DVB_DEVICE_AUDIO] = "audio",
48 [DVB_DEVICE_SEC] = "sec",
49 [DVB_DEVICE_FRONTEND] = "frontend",
50 [DVB_DEVICE_DEMUX] = "demux",
51 [DVB_DEVICE_DVR] = "dvr",
52 [DVB_DEVICE_CA] = "ca",
53 [DVB_DEVICE_NET] = "net",
54 [DVB_DEVICE_OSD] = "osd"
55 };
56
57 #ifdef CONFIG_DVB_DYNAMIC_MINORS
58 #define MAX_DVB_MINORS 256
59 #define DVB_MAX_IDS MAX_DVB_MINORS
60 #else
61 #define DVB_MAX_IDS 4
62
63 static const u8 minor_type[] = {
64 [DVB_DEVICE_VIDEO] = 0,
65 [DVB_DEVICE_AUDIO] = 1,
66 [DVB_DEVICE_SEC] = 2,
67 [DVB_DEVICE_FRONTEND] = 3,
68 [DVB_DEVICE_DEMUX] = 4,
69 [DVB_DEVICE_DVR] = 5,
70 [DVB_DEVICE_CA] = 6,
71 [DVB_DEVICE_NET] = 7,
72 [DVB_DEVICE_OSD] = 8,
73 };
74
75 #define nums2minor(num, type, id) \
76 (((num) << 6) | ((id) << 4) | minor_type[type])
77
78 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS * 64)
79 #endif
80
81 static struct class *dvb_class;
82
83 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
84 static DECLARE_RWSEM(minor_rwsem);
85
dvb_device_open(struct inode * inode,struct file * file)86 static int dvb_device_open(struct inode *inode, struct file *file)
87 {
88 struct dvb_device *dvbdev;
89 unsigned int minor = iminor(inode);
90
91 if (minor >= MAX_DVB_MINORS)
92 return -ENODEV;
93
94 mutex_lock(&dvbdev_mutex);
95 down_read(&minor_rwsem);
96
97 dvbdev = dvb_minors[minor];
98
99 if (dvbdev && dvbdev->fops) {
100 int err = 0;
101 const struct file_operations *new_fops;
102
103 new_fops = fops_get(dvbdev->fops);
104 if (!new_fops)
105 goto fail;
106 file->private_data = dvb_device_get(dvbdev);
107 replace_fops(file, new_fops);
108 if (file->f_op->open)
109 err = file->f_op->open(inode, file);
110 up_read(&minor_rwsem);
111 mutex_unlock(&dvbdev_mutex);
112 if (err)
113 dvb_device_put(dvbdev);
114 return err;
115 }
116 fail:
117 up_read(&minor_rwsem);
118 mutex_unlock(&dvbdev_mutex);
119 return -ENODEV;
120 }
121
122 static const struct file_operations dvb_device_fops = {
123 .owner = THIS_MODULE,
124 .open = dvb_device_open,
125 .llseek = noop_llseek,
126 };
127
128 static struct cdev dvb_device_cdev;
129
dvb_generic_open(struct inode * inode,struct file * file)130 int dvb_generic_open(struct inode *inode, struct file *file)
131 {
132 struct dvb_device *dvbdev = file->private_data;
133
134 if (!dvbdev)
135 return -ENODEV;
136
137 if (!dvbdev->users)
138 return -EBUSY;
139
140 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
141 if (!dvbdev->readers)
142 return -EBUSY;
143 dvbdev->readers--;
144 } else {
145 if (!dvbdev->writers)
146 return -EBUSY;
147 dvbdev->writers--;
148 }
149
150 dvbdev->users--;
151 return 0;
152 }
153 EXPORT_SYMBOL(dvb_generic_open);
154
dvb_generic_release(struct inode * inode,struct file * file)155 int dvb_generic_release(struct inode *inode, struct file *file)
156 {
157 struct dvb_device *dvbdev = file->private_data;
158
159 if (!dvbdev)
160 return -ENODEV;
161
162 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
163 dvbdev->readers++;
164 else
165 dvbdev->writers++;
166
167 dvbdev->users++;
168
169 dvb_device_put(dvbdev);
170
171 return 0;
172 }
173 EXPORT_SYMBOL(dvb_generic_release);
174
dvb_generic_ioctl(struct file * file,unsigned int cmd,unsigned long arg)175 long dvb_generic_ioctl(struct file *file,
176 unsigned int cmd, unsigned long arg)
177 {
178 struct dvb_device *dvbdev = file->private_data;
179
180 if (!dvbdev)
181 return -ENODEV;
182
183 if (!dvbdev->kernel_ioctl)
184 return -EINVAL;
185
186 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
187 }
188 EXPORT_SYMBOL(dvb_generic_ioctl);
189
dvbdev_get_free_id(struct dvb_adapter * adap,int type)190 static int dvbdev_get_free_id(struct dvb_adapter *adap, int type)
191 {
192 u32 id = 0;
193
194 while (id < DVB_MAX_IDS) {
195 struct dvb_device *dev;
196
197 list_for_each_entry(dev, &adap->device_list, list_head)
198 if (dev->type == type && dev->id == id)
199 goto skip;
200 return id;
201 skip:
202 id++;
203 }
204 return -ENFILE;
205 }
206
dvb_media_device_free(struct dvb_device * dvbdev)207 static void dvb_media_device_free(struct dvb_device *dvbdev)
208 {
209 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
210 if (dvbdev->entity) {
211 media_device_unregister_entity(dvbdev->entity);
212 kfree(dvbdev->entity);
213 kfree(dvbdev->pads);
214 dvbdev->entity = NULL;
215 dvbdev->pads = NULL;
216 }
217
218 if (dvbdev->tsout_entity) {
219 int i;
220
221 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
222 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
223 kfree(dvbdev->tsout_entity[i].name);
224 }
225 kfree(dvbdev->tsout_entity);
226 kfree(dvbdev->tsout_pads);
227 dvbdev->tsout_entity = NULL;
228 dvbdev->tsout_pads = NULL;
229
230 dvbdev->tsout_num_entities = 0;
231 }
232
233 if (dvbdev->intf_devnode) {
234 media_devnode_remove(dvbdev->intf_devnode);
235 dvbdev->intf_devnode = NULL;
236 }
237
238 if (dvbdev->adapter->conn) {
239 media_device_unregister_entity(dvbdev->adapter->conn);
240 kfree(dvbdev->adapter->conn);
241 dvbdev->adapter->conn = NULL;
242 kfree(dvbdev->adapter->conn_pads);
243 dvbdev->adapter->conn_pads = NULL;
244 }
245 #endif
246 }
247
248 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
dvb_create_tsout_entity(struct dvb_device * dvbdev,const char * name,int npads)249 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
250 const char *name, int npads)
251 {
252 int i;
253
254 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
255 GFP_KERNEL);
256 if (!dvbdev->tsout_pads)
257 return -ENOMEM;
258
259 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
260 GFP_KERNEL);
261 if (!dvbdev->tsout_entity)
262 return -ENOMEM;
263
264 dvbdev->tsout_num_entities = npads;
265
266 for (i = 0; i < npads; i++) {
267 struct media_pad *pads = &dvbdev->tsout_pads[i];
268 struct media_entity *entity = &dvbdev->tsout_entity[i];
269 int ret;
270
271 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
272 if (!entity->name)
273 return -ENOMEM;
274
275 entity->function = MEDIA_ENT_F_IO_DTV;
276 pads->flags = MEDIA_PAD_FL_SINK;
277
278 ret = media_entity_pads_init(entity, 1, pads);
279 if (ret < 0)
280 return ret;
281
282 ret = media_device_register_entity(dvbdev->adapter->mdev,
283 entity);
284 if (ret < 0)
285 return ret;
286 }
287 return 0;
288 }
289
290 #define DEMUX_TSOUT "demux-tsout"
291 #define DVR_TSOUT "dvr-tsout"
292
dvb_create_media_entity(struct dvb_device * dvbdev,int type,int demux_sink_pads)293 static int dvb_create_media_entity(struct dvb_device *dvbdev,
294 int type, int demux_sink_pads)
295 {
296 int i, ret, npads;
297
298 switch (type) {
299 case DVB_DEVICE_FRONTEND:
300 npads = 2;
301 break;
302 case DVB_DEVICE_DVR:
303 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
304 demux_sink_pads);
305 return ret;
306 case DVB_DEVICE_DEMUX:
307 npads = 1 + demux_sink_pads;
308 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
309 demux_sink_pads);
310 if (ret < 0)
311 return ret;
312 break;
313 case DVB_DEVICE_CA:
314 npads = 2;
315 break;
316 case DVB_DEVICE_NET:
317 /*
318 * We should be creating entities for the MPE/ULE
319 * decapsulation hardware (or software implementation).
320 *
321 * However, the number of for the MPE/ULE decaps may not be
322 * fixed. As we don't have yet dynamic support for PADs at
323 * the Media Controller, let's not create the decap
324 * entities yet.
325 */
326 return 0;
327 default:
328 return 0;
329 }
330
331 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
332 if (!dvbdev->entity)
333 return -ENOMEM;
334
335 dvbdev->entity->name = dvbdev->name;
336
337 if (npads) {
338 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
339 GFP_KERNEL);
340 if (!dvbdev->pads) {
341 kfree(dvbdev->entity);
342 dvbdev->entity = NULL;
343 return -ENOMEM;
344 }
345 }
346
347 switch (type) {
348 case DVB_DEVICE_FRONTEND:
349 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
350 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
351 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
352 break;
353 case DVB_DEVICE_DEMUX:
354 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
355 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
356 for (i = 1; i < npads; i++)
357 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
358 break;
359 case DVB_DEVICE_CA:
360 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
361 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
362 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
363 break;
364 default:
365 /* Should never happen, as the first switch prevents it */
366 kfree(dvbdev->entity);
367 kfree(dvbdev->pads);
368 dvbdev->entity = NULL;
369 dvbdev->pads = NULL;
370 return 0;
371 }
372
373 if (npads) {
374 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
375 if (ret)
376 return ret;
377 }
378 ret = media_device_register_entity(dvbdev->adapter->mdev,
379 dvbdev->entity);
380 if (ret)
381 return ret;
382
383 pr_info("%s: media entity '%s' registered.\n",
384 __func__, dvbdev->entity->name);
385
386 return 0;
387 }
388 #endif
389
dvb_register_media_device(struct dvb_device * dvbdev,int type,int minor,unsigned int demux_sink_pads)390 static int dvb_register_media_device(struct dvb_device *dvbdev,
391 int type, int minor,
392 unsigned int demux_sink_pads)
393 {
394 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
395 struct media_link *link;
396 u32 intf_type;
397 int ret;
398
399 if (!dvbdev->adapter->mdev)
400 return 0;
401
402 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
403 if (ret)
404 return ret;
405
406 switch (type) {
407 case DVB_DEVICE_FRONTEND:
408 intf_type = MEDIA_INTF_T_DVB_FE;
409 break;
410 case DVB_DEVICE_DEMUX:
411 intf_type = MEDIA_INTF_T_DVB_DEMUX;
412 break;
413 case DVB_DEVICE_DVR:
414 intf_type = MEDIA_INTF_T_DVB_DVR;
415 break;
416 case DVB_DEVICE_CA:
417 intf_type = MEDIA_INTF_T_DVB_CA;
418 break;
419 case DVB_DEVICE_NET:
420 intf_type = MEDIA_INTF_T_DVB_NET;
421 break;
422 default:
423 return 0;
424 }
425
426 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
427 intf_type, 0,
428 DVB_MAJOR, minor);
429
430 if (!dvbdev->intf_devnode)
431 return -ENOMEM;
432
433 /*
434 * Create the "obvious" link, e. g. the ones that represent
435 * a direct association between an interface and an entity.
436 * Other links should be created elsewhere, like:
437 * DVB FE intf -> tuner
438 * DVB demux intf -> dvr
439 */
440
441 if (!dvbdev->entity)
442 return 0;
443
444 link = media_create_intf_link(dvbdev->entity,
445 &dvbdev->intf_devnode->intf,
446 MEDIA_LNK_FL_ENABLED |
447 MEDIA_LNK_FL_IMMUTABLE);
448 if (!link)
449 return -ENOMEM;
450 #endif
451 return 0;
452 }
453
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)454 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
455 const struct dvb_device *template, void *priv,
456 enum dvb_device_type type, int demux_sink_pads)
457 {
458 struct dvb_device *dvbdev;
459 struct file_operations *dvbdevfops = NULL;
460 struct dvbdevfops_node *node = NULL, *new_node = NULL;
461 struct device *clsdev;
462 int minor;
463 int id, ret;
464
465 mutex_lock(&dvbdev_register_lock);
466
467 id = dvbdev_get_free_id(adap, type);
468 if (id < 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 if (!dvbdev) {
477 mutex_unlock(&dvbdev_register_lock);
478 return -ENOMEM;
479 }
480
481 /*
482 * When a device of the same type is probe()d more than once,
483 * the first allocated fops are used. This prevents memory leaks
484 * that can occur when the same device is probe()d repeatedly.
485 */
486 list_for_each_entry(node, &dvbdevfops_list, list_head) {
487 if (node->fops->owner == adap->module &&
488 node->type == type && node->template == template) {
489 dvbdevfops = node->fops;
490 break;
491 }
492 }
493
494 if (!dvbdevfops) {
495 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
496 if (!dvbdevfops) {
497 kfree(dvbdev);
498 *pdvbdev = NULL;
499 mutex_unlock(&dvbdev_register_lock);
500 return -ENOMEM;
501 }
502
503 new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
504 if (!new_node) {
505 kfree(dvbdevfops);
506 kfree(dvbdev);
507 *pdvbdev = NULL;
508 mutex_unlock(&dvbdev_register_lock);
509 return -ENOMEM;
510 }
511
512 new_node->fops = dvbdevfops;
513 new_node->type = type;
514 new_node->template = template;
515 list_add_tail(&new_node->list_head, &dvbdevfops_list);
516 }
517
518 memcpy(dvbdev, template, sizeof(struct dvb_device));
519 kref_init(&dvbdev->ref);
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])
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 *pdvbdev = NULL;
542 up_write(&minor_rwsem);
543 mutex_unlock(&dvbdev_register_lock);
544 return -EINVAL;
545 }
546 #else
547 minor = nums2minor(adap->num, type, id);
548 if (minor >= MAX_DVB_MINORS) {
549 dvb_media_device_free(dvbdev);
550 list_del(&dvbdev->list_head);
551 kfree(dvbdev);
552 *pdvbdev = NULL;
553 mutex_unlock(&dvbdev_register_lock);
554 return ret;
555 }
556 #endif
557 dvbdev->minor = minor;
558 dvb_minors[minor] = dvb_device_get(dvbdev);
559 up_write(&minor_rwsem);
560 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
561 if (ret) {
562 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
563 __func__);
564 if (new_node) {
565 list_del(&new_node->list_head);
566 kfree(dvbdevfops);
567 kfree(new_node);
568 }
569 dvb_media_device_free(dvbdev);
570 list_del(&dvbdev->list_head);
571 kfree(dvbdev);
572 *pdvbdev = NULL;
573 mutex_unlock(&dvbdev_register_lock);
574 return ret;
575 }
576
577 clsdev = device_create(dvb_class, adap->device,
578 MKDEV(DVB_MAJOR, minor),
579 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
580 if (IS_ERR(clsdev)) {
581 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
582 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
583 if (new_node) {
584 list_del(&new_node->list_head);
585 kfree(dvbdevfops);
586 kfree(new_node);
587 }
588 dvb_media_device_free(dvbdev);
589 list_del(&dvbdev->list_head);
590 kfree(dvbdev);
591 *pdvbdev = NULL;
592 mutex_unlock(&dvbdev_register_lock);
593 return PTR_ERR(clsdev);
594 }
595
596 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
597 adap->num, dnames[type], id, minor, minor);
598
599 mutex_unlock(&dvbdev_register_lock);
600 return 0;
601 }
602 EXPORT_SYMBOL(dvb_register_device);
603
dvb_remove_device(struct dvb_device * dvbdev)604 void dvb_remove_device(struct dvb_device *dvbdev)
605 {
606 if (!dvbdev)
607 return;
608
609 down_write(&minor_rwsem);
610 dvb_minors[dvbdev->minor] = NULL;
611 dvb_device_put(dvbdev);
612 up_write(&minor_rwsem);
613
614 dvb_media_device_free(dvbdev);
615
616 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
617
618 list_del(&dvbdev->list_head);
619 }
620 EXPORT_SYMBOL(dvb_remove_device);
621
dvb_free_device(struct kref * ref)622 static void dvb_free_device(struct kref *ref)
623 {
624 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
625
626 kfree(dvbdev);
627 }
628
dvb_device_get(struct dvb_device * dvbdev)629 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
630 {
631 kref_get(&dvbdev->ref);
632 return dvbdev;
633 }
634 EXPORT_SYMBOL(dvb_device_get);
635
dvb_device_put(struct dvb_device * dvbdev)636 void dvb_device_put(struct dvb_device *dvbdev)
637 {
638 if (dvbdev)
639 kref_put(&dvbdev->ref, dvb_free_device);
640 }
641
dvb_unregister_device(struct dvb_device * dvbdev)642 void dvb_unregister_device(struct dvb_device *dvbdev)
643 {
644 dvb_remove_device(dvbdev);
645 dvb_device_put(dvbdev);
646 }
647 EXPORT_SYMBOL(dvb_unregister_device);
648
649 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
650
dvb_create_io_intf_links(struct dvb_adapter * adap,struct media_interface * intf,char * name)651 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
652 struct media_interface *intf,
653 char *name)
654 {
655 struct media_device *mdev = adap->mdev;
656 struct media_entity *entity;
657 struct media_link *link;
658
659 media_device_for_each_entity(entity, mdev) {
660 if (entity->function == MEDIA_ENT_F_IO_DTV) {
661 if (strncmp(entity->name, name, strlen(name)))
662 continue;
663 link = media_create_intf_link(entity, intf,
664 MEDIA_LNK_FL_ENABLED |
665 MEDIA_LNK_FL_IMMUTABLE);
666 if (!link)
667 return -ENOMEM;
668 }
669 }
670 return 0;
671 }
672
dvb_create_media_graph(struct dvb_adapter * adap,bool create_rf_connector)673 int dvb_create_media_graph(struct dvb_adapter *adap,
674 bool create_rf_connector)
675 {
676 struct media_device *mdev = adap->mdev;
677 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
678 struct media_entity *demux = NULL, *ca = NULL;
679 struct media_link *link;
680 struct media_interface *intf;
681 unsigned int demux_pad = 0;
682 unsigned int dvr_pad = 0;
683 unsigned int ntuner = 0, ndemod = 0;
684 int ret, pad_source, pad_sink;
685 static const char *connector_name = "Television";
686
687 if (!mdev)
688 return 0;
689
690 media_device_for_each_entity(entity, mdev) {
691 switch (entity->function) {
692 case MEDIA_ENT_F_TUNER:
693 tuner = entity;
694 ntuner++;
695 break;
696 case MEDIA_ENT_F_DTV_DEMOD:
697 demod = entity;
698 ndemod++;
699 break;
700 case MEDIA_ENT_F_TS_DEMUX:
701 demux = entity;
702 break;
703 case MEDIA_ENT_F_DTV_CA:
704 ca = entity;
705 break;
706 }
707 }
708
709 /*
710 * Prepare to signalize to media_create_pad_links() that multiple
711 * entities of the same type exists and a 1:n or n:1 links need to be
712 * created.
713 * NOTE: if both tuner and demod have multiple instances, it is up
714 * to the caller driver to create such links.
715 */
716 if (ntuner > 1)
717 tuner = NULL;
718 if (ndemod > 1)
719 demod = NULL;
720
721 if (create_rf_connector) {
722 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
723 if (!conn)
724 return -ENOMEM;
725 adap->conn = conn;
726
727 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
728 if (!adap->conn_pads)
729 return -ENOMEM;
730
731 conn->flags = MEDIA_ENT_FL_CONNECTOR;
732 conn->function = MEDIA_ENT_F_CONN_RF;
733 conn->name = connector_name;
734 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
735
736 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
737 if (ret)
738 return ret;
739
740 ret = media_device_register_entity(mdev, conn);
741 if (ret)
742 return ret;
743
744 if (!ntuner) {
745 ret = media_create_pad_links(mdev,
746 MEDIA_ENT_F_CONN_RF,
747 conn, 0,
748 MEDIA_ENT_F_DTV_DEMOD,
749 demod, 0,
750 MEDIA_LNK_FL_ENABLED,
751 false);
752 } else {
753 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK,
754 PAD_SIGNAL_ANALOG);
755 if (pad_sink < 0)
756 return -EINVAL;
757 ret = media_create_pad_links(mdev,
758 MEDIA_ENT_F_CONN_RF,
759 conn, 0,
760 MEDIA_ENT_F_TUNER,
761 tuner, pad_sink,
762 MEDIA_LNK_FL_ENABLED,
763 false);
764 }
765 if (ret)
766 return ret;
767 }
768
769 if (ntuner && ndemod) {
770 /* NOTE: first found tuner source pad presumed correct */
771 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE,
772 PAD_SIGNAL_ANALOG);
773 if (pad_source < 0)
774 return -EINVAL;
775 ret = media_create_pad_links(mdev,
776 MEDIA_ENT_F_TUNER,
777 tuner, pad_source,
778 MEDIA_ENT_F_DTV_DEMOD,
779 demod, 0, MEDIA_LNK_FL_ENABLED,
780 false);
781 if (ret)
782 return ret;
783 }
784
785 if (ndemod && demux) {
786 ret = media_create_pad_links(mdev,
787 MEDIA_ENT_F_DTV_DEMOD,
788 demod, 1,
789 MEDIA_ENT_F_TS_DEMUX,
790 demux, 0, MEDIA_LNK_FL_ENABLED,
791 false);
792 if (ret)
793 return ret;
794 }
795 if (demux && ca) {
796 ret = media_create_pad_link(demux, 1, ca,
797 0, MEDIA_LNK_FL_ENABLED);
798 if (ret)
799 return ret;
800 }
801
802 /* Create demux links for each ringbuffer/pad */
803 if (demux) {
804 media_device_for_each_entity(entity, mdev) {
805 if (entity->function == MEDIA_ENT_F_IO_DTV) {
806 if (!strncmp(entity->name, DVR_TSOUT,
807 strlen(DVR_TSOUT))) {
808 ret = media_create_pad_link(demux,
809 ++dvr_pad,
810 entity, 0, 0);
811 if (ret)
812 return ret;
813 }
814 if (!strncmp(entity->name, DEMUX_TSOUT,
815 strlen(DEMUX_TSOUT))) {
816 ret = media_create_pad_link(demux,
817 ++demux_pad,
818 entity, 0, 0);
819 if (ret)
820 return ret;
821 }
822 }
823 }
824 }
825
826 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
827 media_device_for_each_intf(intf, mdev) {
828 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
829 link = media_create_intf_link(ca, intf,
830 MEDIA_LNK_FL_ENABLED |
831 MEDIA_LNK_FL_IMMUTABLE);
832 if (!link)
833 return -ENOMEM;
834 }
835
836 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
837 link = media_create_intf_link(tuner, intf,
838 MEDIA_LNK_FL_ENABLED |
839 MEDIA_LNK_FL_IMMUTABLE);
840 if (!link)
841 return -ENOMEM;
842 }
843 #if 0
844 /*
845 * Indirect link - let's not create yet, as we don't know how
846 * to handle indirect links, nor if this will
847 * actually be needed.
848 */
849 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
850 link = media_create_intf_link(demux, intf,
851 MEDIA_LNK_FL_ENABLED |
852 MEDIA_LNK_FL_IMMUTABLE);
853 if (!link)
854 return -ENOMEM;
855 }
856 #endif
857 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
858 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
859 if (ret)
860 return ret;
861 }
862 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
863 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
864 if (ret)
865 return ret;
866 }
867 }
868 return 0;
869 }
870 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
871 #endif
872
dvbdev_check_free_adapter_num(int num)873 static int dvbdev_check_free_adapter_num(int num)
874 {
875 struct list_head *entry;
876
877 list_for_each(entry, &dvb_adapter_list) {
878 struct dvb_adapter *adap;
879
880 adap = list_entry(entry, struct dvb_adapter, list_head);
881 if (adap->num == num)
882 return 0;
883 }
884 return 1;
885 }
886
dvbdev_get_free_adapter_num(void)887 static int dvbdev_get_free_adapter_num(void)
888 {
889 int num = 0;
890
891 while (num < DVB_MAX_ADAPTERS) {
892 if (dvbdev_check_free_adapter_num(num))
893 return num;
894 num++;
895 }
896
897 return -ENFILE;
898 }
899
dvb_register_adapter(struct dvb_adapter * adap,const char * name,struct module * module,struct device * device,short * adapter_nums)900 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
901 struct module *module, struct device *device,
902 short *adapter_nums)
903 {
904 int i, num;
905
906 mutex_lock(&dvbdev_register_lock);
907
908 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
909 num = adapter_nums[i];
910 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
911 /* use the one the driver asked for */
912 if (dvbdev_check_free_adapter_num(num))
913 break;
914 } else {
915 num = dvbdev_get_free_adapter_num();
916 break;
917 }
918 num = -1;
919 }
920
921 if (num < 0) {
922 mutex_unlock(&dvbdev_register_lock);
923 return -ENFILE;
924 }
925
926 memset(adap, 0, sizeof(struct dvb_adapter));
927 INIT_LIST_HEAD(&adap->device_list);
928
929 pr_info("DVB: registering new adapter (%s)\n", name);
930
931 adap->num = num;
932 adap->name = name;
933 adap->module = module;
934 adap->device = device;
935 adap->mfe_shared = 0;
936 adap->mfe_dvbdev = NULL;
937 mutex_init(&adap->mfe_lock);
938
939 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
940 mutex_init(&adap->mdev_lock);
941 #endif
942
943 list_add_tail(&adap->list_head, &dvb_adapter_list);
944
945 mutex_unlock(&dvbdev_register_lock);
946
947 return num;
948 }
949 EXPORT_SYMBOL(dvb_register_adapter);
950
dvb_unregister_adapter(struct dvb_adapter * adap)951 int dvb_unregister_adapter(struct dvb_adapter *adap)
952 {
953 mutex_lock(&dvbdev_register_lock);
954 list_del(&adap->list_head);
955 mutex_unlock(&dvbdev_register_lock);
956 return 0;
957 }
958 EXPORT_SYMBOL(dvb_unregister_adapter);
959
960 /*
961 * if the miracle happens and "generic_usercopy()" is included into
962 * the kernel, then this can vanish. please don't make the mistake and
963 * define this as video_usercopy(). this will introduce a dependency
964 * to the v4l "videodev.o" module, which is unnecessary for some
965 * cards (ie. the budget dvb-cards don't need the v4l module...)
966 */
dvb_usercopy(struct file * file,unsigned int cmd,unsigned long arg,int (* func)(struct file * file,unsigned int cmd,void * arg))967 int dvb_usercopy(struct file *file,
968 unsigned int cmd, unsigned long arg,
969 int (*func)(struct file *file,
970 unsigned int cmd, void *arg))
971 {
972 char sbuf[128] = {};
973 void *mbuf = NULL;
974 void *parg = NULL;
975 int err = -EINVAL;
976
977 /* Copy arguments into temp kernel buffer */
978 switch (_IOC_DIR(cmd)) {
979 case _IOC_NONE:
980 /*
981 * For this command, the pointer is actually an integer
982 * argument.
983 */
984 parg = (void *)arg;
985 break;
986 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
987 case _IOC_WRITE:
988 case (_IOC_WRITE | _IOC_READ):
989 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
990 parg = sbuf;
991 } else {
992 /* too big to allocate from stack */
993 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
994 if (!mbuf)
995 return -ENOMEM;
996 parg = mbuf;
997 }
998
999 err = -EFAULT;
1000 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
1001 goto out;
1002 break;
1003 }
1004
1005 /* call driver */
1006 err = func(file, cmd, parg);
1007 if (err == -ENOIOCTLCMD)
1008 err = -ENOTTY;
1009
1010 if (err < 0)
1011 goto out;
1012
1013 /* Copy results into user buffer */
1014 switch (_IOC_DIR(cmd)) {
1015 case _IOC_READ:
1016 case (_IOC_WRITE | _IOC_READ):
1017 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
1018 err = -EFAULT;
1019 break;
1020 }
1021
1022 out:
1023 kfree(mbuf);
1024 return err;
1025 }
1026
1027 #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)1028 struct i2c_client *dvb_module_probe(const char *module_name,
1029 const char *name,
1030 struct i2c_adapter *adap,
1031 unsigned char addr,
1032 void *platform_data)
1033 {
1034 struct i2c_client *client;
1035 struct i2c_board_info *board_info;
1036
1037 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
1038 if (!board_info)
1039 return NULL;
1040
1041 if (name)
1042 strscpy(board_info->type, name, I2C_NAME_SIZE);
1043 else
1044 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1045
1046 board_info->addr = addr;
1047 board_info->platform_data = platform_data;
1048 request_module(module_name);
1049 client = i2c_new_client_device(adap, board_info);
1050 if (!i2c_client_has_driver(client)) {
1051 kfree(board_info);
1052 return NULL;
1053 }
1054
1055 if (!try_module_get(client->dev.driver->owner)) {
1056 i2c_unregister_device(client);
1057 client = NULL;
1058 }
1059
1060 kfree(board_info);
1061 return client;
1062 }
1063 EXPORT_SYMBOL_GPL(dvb_module_probe);
1064
dvb_module_release(struct i2c_client * client)1065 void dvb_module_release(struct i2c_client *client)
1066 {
1067 if (!client)
1068 return;
1069
1070 module_put(client->dev.driver->owner);
1071 i2c_unregister_device(client);
1072 }
1073 EXPORT_SYMBOL_GPL(dvb_module_release);
1074 #endif
1075
dvb_uevent(const struct device * dev,struct kobj_uevent_env * env)1076 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)
1077 {
1078 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1079
1080 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1081 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1082 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1083 return 0;
1084 }
1085
dvb_devnode(const struct device * dev,umode_t * mode)1086 static char *dvb_devnode(const struct device *dev, umode_t *mode)
1087 {
1088 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1089
1090 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1091 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1092 }
1093
init_dvbdev(void)1094 static int __init init_dvbdev(void)
1095 {
1096 int retval;
1097 dev_t dev = MKDEV(DVB_MAJOR, 0);
1098
1099 retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB");
1100 if (retval != 0) {
1101 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1102 return retval;
1103 }
1104
1105 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1106 retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS);
1107 if (retval != 0) {
1108 pr_err("dvb-core: unable register character device\n");
1109 goto error;
1110 }
1111
1112 dvb_class = class_create("dvb");
1113 if (IS_ERR(dvb_class)) {
1114 retval = PTR_ERR(dvb_class);
1115 goto error;
1116 }
1117 dvb_class->dev_uevent = dvb_uevent;
1118 dvb_class->devnode = dvb_devnode;
1119 return 0;
1120
1121 error:
1122 cdev_del(&dvb_device_cdev);
1123 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1124 return retval;
1125 }
1126
exit_dvbdev(void)1127 static void __exit exit_dvbdev(void)
1128 {
1129 struct dvbdevfops_node *node, *next;
1130
1131 class_destroy(dvb_class);
1132 cdev_del(&dvb_device_cdev);
1133 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1134
1135 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
1136 list_del(&node->list_head);
1137 kfree(node->fops);
1138 kfree(node);
1139 }
1140 }
1141
1142 subsys_initcall(init_dvbdev);
1143 module_exit(exit_dvbdev);
1144
1145 MODULE_DESCRIPTION("DVB Core Driver");
1146 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1147 MODULE_LICENSE("GPL");
1148