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 = kzalloc_objs(*dvbdev->tsout_pads, npads);
255 if (!dvbdev->tsout_pads)
256 return -ENOMEM;
257
258 dvbdev->tsout_entity = kzalloc_objs(*dvbdev->tsout_entity, npads);
259 if (!dvbdev->tsout_entity)
260 return -ENOMEM;
261
262 dvbdev->tsout_num_entities = npads;
263
264 for (i = 0; i < npads; i++) {
265 struct media_pad *pads = &dvbdev->tsout_pads[i];
266 struct media_entity *entity = &dvbdev->tsout_entity[i];
267 int ret;
268
269 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
270 if (!entity->name)
271 return -ENOMEM;
272
273 entity->function = MEDIA_ENT_F_IO_DTV;
274 pads->flags = MEDIA_PAD_FL_SINK;
275
276 ret = media_entity_pads_init(entity, 1, pads);
277 if (ret < 0)
278 return ret;
279
280 ret = media_device_register_entity(dvbdev->adapter->mdev,
281 entity);
282 if (ret < 0)
283 return ret;
284 }
285 return 0;
286 }
287
288 #define DEMUX_TSOUT "demux-tsout"
289 #define DVR_TSOUT "dvr-tsout"
290
dvb_create_media_entity(struct dvb_device * dvbdev,int type,int demux_sink_pads)291 static int dvb_create_media_entity(struct dvb_device *dvbdev,
292 int type, int demux_sink_pads)
293 {
294 int i, ret, npads;
295
296 switch (type) {
297 case DVB_DEVICE_FRONTEND:
298 npads = 2;
299 break;
300 case DVB_DEVICE_DVR:
301 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
302 demux_sink_pads);
303 return ret;
304 case DVB_DEVICE_DEMUX:
305 npads = 1 + demux_sink_pads;
306 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
307 demux_sink_pads);
308 if (ret < 0)
309 return ret;
310 break;
311 case DVB_DEVICE_CA:
312 npads = 2;
313 break;
314 case DVB_DEVICE_NET:
315 /*
316 * We should be creating entities for the MPE/ULE
317 * decapsulation hardware (or software implementation).
318 *
319 * However, the number of for the MPE/ULE decaps may not be
320 * fixed. As we don't have yet dynamic support for PADs at
321 * the Media Controller, let's not create the decap
322 * entities yet.
323 */
324 return 0;
325 default:
326 return 0;
327 }
328
329 dvbdev->entity = kzalloc_obj(*dvbdev->entity);
330 if (!dvbdev->entity)
331 return -ENOMEM;
332
333 dvbdev->entity->name = dvbdev->name;
334
335 if (npads) {
336 dvbdev->pads = kzalloc_objs(*dvbdev->pads, npads);
337 if (!dvbdev->pads) {
338 kfree(dvbdev->entity);
339 dvbdev->entity = NULL;
340 return -ENOMEM;
341 }
342 }
343
344 switch (type) {
345 case DVB_DEVICE_FRONTEND:
346 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
347 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
348 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
349 break;
350 case DVB_DEVICE_DEMUX:
351 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
352 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
353 for (i = 1; i < npads; i++)
354 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
355 break;
356 case DVB_DEVICE_CA:
357 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
358 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
359 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
360 break;
361 default:
362 /* Should never happen, as the first switch prevents it */
363 kfree(dvbdev->entity);
364 kfree(dvbdev->pads);
365 dvbdev->entity = NULL;
366 dvbdev->pads = NULL;
367 return 0;
368 }
369
370 if (npads) {
371 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
372 if (ret)
373 return ret;
374 }
375 ret = media_device_register_entity(dvbdev->adapter->mdev,
376 dvbdev->entity);
377 if (ret)
378 return ret;
379
380 pr_info("%s: media entity '%s' registered.\n",
381 __func__, dvbdev->entity->name);
382
383 return 0;
384 }
385 #endif
386
dvb_register_media_device(struct dvb_device * dvbdev,int type,int minor,unsigned int demux_sink_pads)387 static int dvb_register_media_device(struct dvb_device *dvbdev,
388 int type, int minor,
389 unsigned int demux_sink_pads)
390 {
391 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
392 struct media_link *link;
393 u32 intf_type;
394 int ret;
395
396 if (!dvbdev->adapter->mdev)
397 return 0;
398
399 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
400 if (ret)
401 return ret;
402
403 switch (type) {
404 case DVB_DEVICE_FRONTEND:
405 intf_type = MEDIA_INTF_T_DVB_FE;
406 break;
407 case DVB_DEVICE_DEMUX:
408 intf_type = MEDIA_INTF_T_DVB_DEMUX;
409 break;
410 case DVB_DEVICE_DVR:
411 intf_type = MEDIA_INTF_T_DVB_DVR;
412 break;
413 case DVB_DEVICE_CA:
414 intf_type = MEDIA_INTF_T_DVB_CA;
415 break;
416 case DVB_DEVICE_NET:
417 intf_type = MEDIA_INTF_T_DVB_NET;
418 break;
419 default:
420 return 0;
421 }
422
423 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
424 intf_type, 0,
425 DVB_MAJOR, minor);
426
427 if (!dvbdev->intf_devnode)
428 return -ENOMEM;
429
430 /*
431 * Create the "obvious" link, e. g. the ones that represent
432 * a direct association between an interface and an entity.
433 * Other links should be created elsewhere, like:
434 * DVB FE intf -> tuner
435 * DVB demux intf -> dvr
436 */
437
438 if (!dvbdev->entity)
439 return 0;
440
441 link = media_create_intf_link(dvbdev->entity,
442 &dvbdev->intf_devnode->intf,
443 MEDIA_LNK_FL_ENABLED |
444 MEDIA_LNK_FL_IMMUTABLE);
445 if (!link)
446 return -ENOMEM;
447 #endif
448 return 0;
449 }
450
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)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 = NULL;
457 struct dvbdevfops_node *node = NULL, *new_node = NULL;
458 struct device *clsdev;
459 int minor;
460 int id, ret;
461
462 mutex_lock(&dvbdev_register_lock);
463
464 id = dvbdev_get_free_id(adap, type);
465 if (id < 0) {
466 mutex_unlock(&dvbdev_register_lock);
467 *pdvbdev = NULL;
468 pr_err("%s: couldn't find free device id\n", __func__);
469 return -ENFILE;
470 }
471
472 *pdvbdev = dvbdev = kzalloc_obj(*dvbdev);
473 if (!dvbdev) {
474 mutex_unlock(&dvbdev_register_lock);
475 return -ENOMEM;
476 }
477
478 /*
479 * When a device of the same type is probe()d more than once,
480 * the first allocated fops are used. This prevents memory leaks
481 * that can occur when the same device is probe()d repeatedly.
482 */
483 list_for_each_entry(node, &dvbdevfops_list, list_head) {
484 if (node->fops->owner == adap->module &&
485 node->type == type && node->template == template) {
486 dvbdevfops = node->fops;
487 break;
488 }
489 }
490
491 if (!dvbdevfops) {
492 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
493 if (!dvbdevfops) {
494 kfree(dvbdev);
495 *pdvbdev = NULL;
496 mutex_unlock(&dvbdev_register_lock);
497 return -ENOMEM;
498 }
499
500 new_node = kzalloc_obj(*new_node);
501 if (!new_node) {
502 kfree(dvbdevfops);
503 kfree(dvbdev);
504 *pdvbdev = NULL;
505 mutex_unlock(&dvbdev_register_lock);
506 return -ENOMEM;
507 }
508
509 new_node->fops = dvbdevfops;
510 new_node->type = type;
511 new_node->template = template;
512 list_add_tail(&new_node->list_head, &dvbdevfops_list);
513 }
514
515 memcpy(dvbdev, template, sizeof(struct dvb_device));
516 kref_init(&dvbdev->ref);
517 dvbdev->type = type;
518 dvbdev->id = id;
519 dvbdev->adapter = adap;
520 dvbdev->priv = priv;
521 dvbdev->fops = dvbdevfops;
522 init_waitqueue_head(&dvbdev->wait_queue);
523 dvbdevfops->owner = adap->module;
524 list_add_tail(&dvbdev->list_head, &adap->device_list);
525 down_write(&minor_rwsem);
526 #ifdef CONFIG_DVB_DYNAMIC_MINORS
527 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
528 if (!dvb_minors[minor])
529 break;
530 #else
531 minor = nums2minor(adap->num, type, id);
532 #endif
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
547 dvbdev->minor = minor;
548 dvb_minors[minor] = dvb_device_get(dvbdev);
549 up_write(&minor_rwsem);
550 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
551 if (ret) {
552 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
553 __func__);
554 if (new_node) {
555 list_del(&new_node->list_head);
556 kfree(dvbdevfops);
557 kfree(new_node);
558 }
559 dvb_media_device_free(dvbdev);
560 list_del(&dvbdev->list_head);
561 kfree(dvbdev);
562 *pdvbdev = NULL;
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 (%pe)\n",
572 __func__, adap->num, dnames[type], id, 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 *pdvbdev = NULL;
582 mutex_unlock(&dvbdev_register_lock);
583 return PTR_ERR(clsdev);
584 }
585
586 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
587 adap->num, dnames[type], id, minor, minor);
588
589 mutex_unlock(&dvbdev_register_lock);
590 return 0;
591 }
592 EXPORT_SYMBOL(dvb_register_device);
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 dvb_device_put(dvbdev);
602 up_write(&minor_rwsem);
603
604 dvb_media_device_free(dvbdev);
605
606 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
607
608 list_del(&dvbdev->list_head);
609 }
610 EXPORT_SYMBOL(dvb_remove_device);
611
dvb_free_device(struct kref * ref)612 static void dvb_free_device(struct kref *ref)
613 {
614 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
615
616 kfree(dvbdev);
617 }
618
dvb_device_get(struct dvb_device * dvbdev)619 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
620 {
621 kref_get(&dvbdev->ref);
622 return dvbdev;
623 }
624 EXPORT_SYMBOL(dvb_device_get);
625
dvb_device_put(struct dvb_device * dvbdev)626 void dvb_device_put(struct dvb_device *dvbdev)
627 {
628 if (dvbdev)
629 kref_put(&dvbdev->ref, dvb_free_device);
630 }
631
dvb_unregister_device(struct dvb_device * dvbdev)632 void dvb_unregister_device(struct dvb_device *dvbdev)
633 {
634 dvb_remove_device(dvbdev);
635 dvb_device_put(dvbdev);
636 }
637 EXPORT_SYMBOL(dvb_unregister_device);
638
639 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
640
dvb_create_io_intf_links(struct dvb_adapter * adap,struct media_interface * intf,char * name)641 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
642 struct media_interface *intf,
643 char *name)
644 {
645 struct media_device *mdev = adap->mdev;
646 struct media_entity *entity;
647 struct media_link *link;
648
649 media_device_for_each_entity(entity, mdev) {
650 if (entity->function == MEDIA_ENT_F_IO_DTV) {
651 if (strncmp(entity->name, name, strlen(name)))
652 continue;
653 link = media_create_intf_link(entity, intf,
654 MEDIA_LNK_FL_ENABLED |
655 MEDIA_LNK_FL_IMMUTABLE);
656 if (!link)
657 return -ENOMEM;
658 }
659 }
660 return 0;
661 }
662
dvb_create_media_graph(struct dvb_adapter * adap,bool create_rf_connector)663 int dvb_create_media_graph(struct dvb_adapter *adap,
664 bool create_rf_connector)
665 {
666 struct media_device *mdev = adap->mdev;
667 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
668 struct media_entity *demux = NULL, *ca = NULL;
669 struct media_link *link;
670 struct media_interface *intf;
671 unsigned int demux_pad = 0;
672 unsigned int dvr_pad = 0;
673 unsigned int ntuner = 0, ndemod = 0;
674 int ret, pad_source, pad_sink;
675 static const char *connector_name = "Television";
676
677 if (!mdev)
678 return 0;
679
680 media_device_for_each_entity(entity, mdev) {
681 switch (entity->function) {
682 case MEDIA_ENT_F_TUNER:
683 tuner = entity;
684 ntuner++;
685 break;
686 case MEDIA_ENT_F_DTV_DEMOD:
687 demod = entity;
688 ndemod++;
689 break;
690 case MEDIA_ENT_F_TS_DEMUX:
691 demux = entity;
692 break;
693 case MEDIA_ENT_F_DTV_CA:
694 ca = entity;
695 break;
696 }
697 }
698
699 /*
700 * Prepare to signalize to media_create_pad_links() that multiple
701 * entities of the same type exists and a 1:n or n:1 links need to be
702 * created.
703 * NOTE: if both tuner and demod have multiple instances, it is up
704 * to the caller driver to create such links.
705 */
706 if (ntuner > 1)
707 tuner = NULL;
708 if (ndemod > 1)
709 demod = NULL;
710
711 if (create_rf_connector) {
712 conn = kzalloc_obj(*conn);
713 if (!conn)
714 return -ENOMEM;
715 adap->conn = conn;
716
717 adap->conn_pads = kzalloc_obj(*adap->conn_pads);
718 if (!adap->conn_pads)
719 return -ENOMEM;
720
721 conn->flags = MEDIA_ENT_FL_CONNECTOR;
722 conn->function = MEDIA_ENT_F_CONN_RF;
723 conn->name = connector_name;
724 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
725
726 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
727 if (ret)
728 return ret;
729
730 ret = media_device_register_entity(mdev, conn);
731 if (ret)
732 return ret;
733
734 if (!ntuner) {
735 ret = media_create_pad_links(mdev,
736 MEDIA_ENT_F_CONN_RF,
737 conn, 0,
738 MEDIA_ENT_F_DTV_DEMOD,
739 demod, 0,
740 MEDIA_LNK_FL_ENABLED,
741 false);
742 } else {
743 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK,
744 PAD_SIGNAL_ANALOG);
745 if (pad_sink < 0)
746 return -EINVAL;
747 ret = media_create_pad_links(mdev,
748 MEDIA_ENT_F_CONN_RF,
749 conn, 0,
750 MEDIA_ENT_F_TUNER,
751 tuner, pad_sink,
752 MEDIA_LNK_FL_ENABLED,
753 false);
754 }
755 if (ret)
756 return ret;
757 }
758
759 if (ntuner && ndemod) {
760 /* NOTE: first found tuner source pad presumed correct */
761 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE,
762 PAD_SIGNAL_ANALOG);
763 if (pad_source < 0)
764 return -EINVAL;
765 ret = media_create_pad_links(mdev,
766 MEDIA_ENT_F_TUNER,
767 tuner, pad_source,
768 MEDIA_ENT_F_DTV_DEMOD,
769 demod, 0, MEDIA_LNK_FL_ENABLED,
770 false);
771 if (ret)
772 return ret;
773 }
774
775 if (ndemod && demux) {
776 ret = media_create_pad_links(mdev,
777 MEDIA_ENT_F_DTV_DEMOD,
778 demod, 1,
779 MEDIA_ENT_F_TS_DEMUX,
780 demux, 0, MEDIA_LNK_FL_ENABLED,
781 false);
782 if (ret)
783 return ret;
784 }
785 if (demux && ca) {
786 ret = media_create_pad_link(demux, 1, ca,
787 0, MEDIA_LNK_FL_ENABLED);
788 if (ret)
789 return ret;
790 }
791
792 /* Create demux links for each ringbuffer/pad */
793 if (demux) {
794 media_device_for_each_entity(entity, mdev) {
795 if (entity->function == MEDIA_ENT_F_IO_DTV) {
796 if (!strncmp(entity->name, DVR_TSOUT,
797 strlen(DVR_TSOUT))) {
798 ret = media_create_pad_link(demux,
799 ++dvr_pad,
800 entity, 0, 0);
801 if (ret)
802 return ret;
803 }
804 if (!strncmp(entity->name, DEMUX_TSOUT,
805 strlen(DEMUX_TSOUT))) {
806 ret = media_create_pad_link(demux,
807 ++demux_pad,
808 entity, 0, 0);
809 if (ret)
810 return ret;
811 }
812 }
813 }
814 }
815
816 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
817 media_device_for_each_intf(intf, mdev) {
818 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
819 link = media_create_intf_link(ca, intf,
820 MEDIA_LNK_FL_ENABLED |
821 MEDIA_LNK_FL_IMMUTABLE);
822 if (!link)
823 return -ENOMEM;
824 }
825
826 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
827 link = media_create_intf_link(tuner, intf,
828 MEDIA_LNK_FL_ENABLED |
829 MEDIA_LNK_FL_IMMUTABLE);
830 if (!link)
831 return -ENOMEM;
832 }
833 #if 0
834 /*
835 * Indirect link - let's not create yet, as we don't know how
836 * to handle indirect links, nor if this will
837 * actually be needed.
838 */
839 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
840 link = media_create_intf_link(demux, intf,
841 MEDIA_LNK_FL_ENABLED |
842 MEDIA_LNK_FL_IMMUTABLE);
843 if (!link)
844 return -ENOMEM;
845 }
846 #endif
847 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
848 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
849 if (ret)
850 return ret;
851 }
852 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
853 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
854 if (ret)
855 return ret;
856 }
857 }
858 return 0;
859 }
860 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
861 #endif
862
dvbdev_check_free_adapter_num(int num)863 static int dvbdev_check_free_adapter_num(int num)
864 {
865 struct list_head *entry;
866
867 list_for_each(entry, &dvb_adapter_list) {
868 struct dvb_adapter *adap;
869
870 adap = list_entry(entry, struct dvb_adapter, list_head);
871 if (adap->num == num)
872 return 0;
873 }
874 return 1;
875 }
876
dvbdev_get_free_adapter_num(void)877 static int dvbdev_get_free_adapter_num(void)
878 {
879 int num = 0;
880
881 while (num < DVB_MAX_ADAPTERS) {
882 if (dvbdev_check_free_adapter_num(num))
883 return num;
884 num++;
885 }
886
887 return -ENFILE;
888 }
889
dvb_register_adapter(struct dvb_adapter * adap,const char * name,struct module * module,struct device * device,short * adapter_nums)890 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
891 struct module *module, struct device *device,
892 short *adapter_nums)
893 {
894 int i, num;
895
896 mutex_lock(&dvbdev_register_lock);
897
898 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
899 num = adapter_nums[i];
900 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
901 /* use the one the driver asked for */
902 if (dvbdev_check_free_adapter_num(num))
903 break;
904 } else {
905 num = dvbdev_get_free_adapter_num();
906 break;
907 }
908 num = -1;
909 }
910
911 if (num < 0) {
912 mutex_unlock(&dvbdev_register_lock);
913 return -ENFILE;
914 }
915
916 memset(adap, 0, sizeof(struct dvb_adapter));
917 INIT_LIST_HEAD(&adap->device_list);
918
919 pr_info("DVB: registering new adapter (%s)\n", name);
920
921 adap->num = num;
922 adap->name = name;
923 adap->module = module;
924 adap->device = device;
925 adap->mfe_shared = 0;
926 adap->mfe_dvbdev = NULL;
927 mutex_init(&adap->mfe_lock);
928
929 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
930 mutex_init(&adap->mdev_lock);
931 #endif
932
933 list_add_tail(&adap->list_head, &dvb_adapter_list);
934
935 mutex_unlock(&dvbdev_register_lock);
936
937 return num;
938 }
939 EXPORT_SYMBOL(dvb_register_adapter);
940
dvb_unregister_adapter(struct dvb_adapter * adap)941 int dvb_unregister_adapter(struct dvb_adapter *adap)
942 {
943 mutex_lock(&dvbdev_register_lock);
944 list_del(&adap->list_head);
945 mutex_unlock(&dvbdev_register_lock);
946 return 0;
947 }
948 EXPORT_SYMBOL(dvb_unregister_adapter);
949
950 /*
951 * if the miracle happens and "generic_usercopy()" is included into
952 * the kernel, then this can vanish. please don't make the mistake and
953 * define this as video_usercopy(). this will introduce a dependency
954 * to the v4l "videodev.o" module, which is unnecessary for some
955 * cards (ie. the budget dvb-cards don't need the v4l module...)
956 */
dvb_usercopy(struct file * file,unsigned int cmd,unsigned long arg,int (* func)(struct file * file,unsigned int cmd,void * arg))957 int dvb_usercopy(struct file *file,
958 unsigned int cmd, unsigned long arg,
959 int (*func)(struct file *file,
960 unsigned int cmd, void *arg))
961 {
962 char sbuf[128] = {};
963 void *mbuf = NULL;
964 void *parg = NULL;
965 int err = -EINVAL;
966
967 /* Copy arguments into temp kernel buffer */
968 switch (_IOC_DIR(cmd)) {
969 case _IOC_NONE:
970 /*
971 * For this command, the pointer is actually an integer
972 * argument.
973 */
974 parg = (void *)arg;
975 break;
976 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
977 case _IOC_WRITE:
978 case (_IOC_WRITE | _IOC_READ):
979 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
980 parg = sbuf;
981 } else {
982 /* too big to allocate from stack */
983 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
984 if (!mbuf)
985 return -ENOMEM;
986 parg = mbuf;
987 }
988
989 err = -EFAULT;
990 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
991 goto out;
992 break;
993 }
994
995 /* call driver */
996 err = func(file, cmd, parg);
997 if (err == -ENOIOCTLCMD)
998 err = -ENOTTY;
999
1000 if (err < 0)
1001 goto out;
1002
1003 /* Copy results into user buffer */
1004 switch (_IOC_DIR(cmd)) {
1005 case _IOC_READ:
1006 case (_IOC_WRITE | _IOC_READ):
1007 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
1008 err = -EFAULT;
1009 break;
1010 }
1011
1012 out:
1013 kfree(mbuf);
1014 return err;
1015 }
1016
1017 #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)1018 struct i2c_client *dvb_module_probe(const char *module_name,
1019 const char *name,
1020 struct i2c_adapter *adap,
1021 unsigned char addr,
1022 void *platform_data)
1023 {
1024 struct i2c_client *client;
1025 struct i2c_board_info *board_info;
1026
1027 board_info = kzalloc_obj(*board_info);
1028 if (!board_info)
1029 return NULL;
1030
1031 if (name)
1032 strscpy(board_info->type, name, I2C_NAME_SIZE);
1033 else
1034 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1035
1036 board_info->addr = addr;
1037 board_info->platform_data = platform_data;
1038 request_module(module_name);
1039 client = i2c_new_client_device(adap, board_info);
1040 if (!i2c_client_has_driver(client)) {
1041 kfree(board_info);
1042 return NULL;
1043 }
1044
1045 if (!try_module_get(client->dev.driver->owner)) {
1046 i2c_unregister_device(client);
1047 client = NULL;
1048 }
1049
1050 kfree(board_info);
1051 return client;
1052 }
1053 EXPORT_SYMBOL_GPL(dvb_module_probe);
1054
dvb_module_release(struct i2c_client * client)1055 void dvb_module_release(struct i2c_client *client)
1056 {
1057 if (!client)
1058 return;
1059
1060 module_put(client->dev.driver->owner);
1061 i2c_unregister_device(client);
1062 }
1063 EXPORT_SYMBOL_GPL(dvb_module_release);
1064 #endif
1065
dvb_uevent(const struct device * dev,struct kobj_uevent_env * env)1066 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)
1067 {
1068 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1069
1070 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1071 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1072 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1073 return 0;
1074 }
1075
dvb_devnode(const struct device * dev,umode_t * mode)1076 static char *dvb_devnode(const struct device *dev, umode_t *mode)
1077 {
1078 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1079
1080 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1081 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1082 }
1083
init_dvbdev(void)1084 static int __init init_dvbdev(void)
1085 {
1086 int retval;
1087 dev_t dev = MKDEV(DVB_MAJOR, 0);
1088
1089 retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB");
1090 if (retval != 0) {
1091 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1092 return retval;
1093 }
1094
1095 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1096 retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS);
1097 if (retval != 0) {
1098 pr_err("dvb-core: unable register character device\n");
1099 goto error;
1100 }
1101
1102 dvb_class = class_create("dvb");
1103 if (IS_ERR(dvb_class)) {
1104 retval = PTR_ERR(dvb_class);
1105 goto error;
1106 }
1107 dvb_class->dev_uevent = dvb_uevent;
1108 dvb_class->devnode = dvb_devnode;
1109 return 0;
1110
1111 error:
1112 cdev_del(&dvb_device_cdev);
1113 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1114 return retval;
1115 }
1116
exit_dvbdev(void)1117 static void __exit exit_dvbdev(void)
1118 {
1119 struct dvbdevfops_node *node, *next;
1120
1121 class_destroy(dvb_class);
1122 cdev_del(&dvb_device_cdev);
1123 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1124
1125 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
1126 list_del(&node->list_head);
1127 kfree(node->fops);
1128 kfree(node);
1129 }
1130 }
1131
1132 subsys_initcall(init_dvbdev);
1133 module_exit(exit_dvbdev);
1134
1135 MODULE_DESCRIPTION("DVB Core Driver");
1136 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1137 MODULE_LICENSE("GPL");
1138