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
90 mutex_lock(&dvbdev_mutex);
91 down_read(&minor_rwsem);
92 dvbdev = dvb_minors[iminor(inode)];
93
94 if (dvbdev && dvbdev->fops) {
95 int err = 0;
96 const struct file_operations *new_fops;
97
98 new_fops = fops_get(dvbdev->fops);
99 if (!new_fops)
100 goto fail;
101 file->private_data = dvb_device_get(dvbdev);
102 replace_fops(file, new_fops);
103 if (file->f_op->open)
104 err = file->f_op->open(inode, file);
105 up_read(&minor_rwsem);
106 mutex_unlock(&dvbdev_mutex);
107 if (err)
108 dvb_device_put(dvbdev);
109 return err;
110 }
111 fail:
112 up_read(&minor_rwsem);
113 mutex_unlock(&dvbdev_mutex);
114 return -ENODEV;
115 }
116
117 static const struct file_operations dvb_device_fops = {
118 .owner = THIS_MODULE,
119 .open = dvb_device_open,
120 .llseek = noop_llseek,
121 };
122
123 static struct cdev dvb_device_cdev;
124
dvb_generic_open(struct inode * inode,struct file * file)125 int dvb_generic_open(struct inode *inode, struct file *file)
126 {
127 struct dvb_device *dvbdev = file->private_data;
128
129 if (!dvbdev)
130 return -ENODEV;
131
132 if (!dvbdev->users)
133 return -EBUSY;
134
135 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
136 if (!dvbdev->readers)
137 return -EBUSY;
138 dvbdev->readers--;
139 } else {
140 if (!dvbdev->writers)
141 return -EBUSY;
142 dvbdev->writers--;
143 }
144
145 dvbdev->users--;
146 return 0;
147 }
148 EXPORT_SYMBOL(dvb_generic_open);
149
dvb_generic_release(struct inode * inode,struct file * file)150 int dvb_generic_release(struct inode *inode, struct file *file)
151 {
152 struct dvb_device *dvbdev = file->private_data;
153
154 if (!dvbdev)
155 return -ENODEV;
156
157 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
158 dvbdev->readers++;
159 else
160 dvbdev->writers++;
161
162 dvbdev->users++;
163
164 dvb_device_put(dvbdev);
165
166 return 0;
167 }
168 EXPORT_SYMBOL(dvb_generic_release);
169
dvb_generic_ioctl(struct file * file,unsigned int cmd,unsigned long arg)170 long dvb_generic_ioctl(struct file *file,
171 unsigned int cmd, unsigned long arg)
172 {
173 struct dvb_device *dvbdev = file->private_data;
174
175 if (!dvbdev)
176 return -ENODEV;
177
178 if (!dvbdev->kernel_ioctl)
179 return -EINVAL;
180
181 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
182 }
183 EXPORT_SYMBOL(dvb_generic_ioctl);
184
dvbdev_get_free_id(struct dvb_adapter * adap,int type)185 static int dvbdev_get_free_id(struct dvb_adapter *adap, int type)
186 {
187 u32 id = 0;
188
189 while (id < DVB_MAX_IDS) {
190 struct dvb_device *dev;
191
192 list_for_each_entry(dev, &adap->device_list, list_head)
193 if (dev->type == type && dev->id == id)
194 goto skip;
195 return id;
196 skip:
197 id++;
198 }
199 return -ENFILE;
200 }
201
dvb_media_device_free(struct dvb_device * dvbdev)202 static void dvb_media_device_free(struct dvb_device *dvbdev)
203 {
204 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
205 if (dvbdev->entity) {
206 media_device_unregister_entity(dvbdev->entity);
207 kfree(dvbdev->entity);
208 kfree(dvbdev->pads);
209 dvbdev->entity = NULL;
210 dvbdev->pads = NULL;
211 }
212
213 if (dvbdev->tsout_entity) {
214 int i;
215
216 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
217 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
218 kfree(dvbdev->tsout_entity[i].name);
219 }
220 kfree(dvbdev->tsout_entity);
221 kfree(dvbdev->tsout_pads);
222 dvbdev->tsout_entity = NULL;
223 dvbdev->tsout_pads = NULL;
224
225 dvbdev->tsout_num_entities = 0;
226 }
227
228 if (dvbdev->intf_devnode) {
229 media_devnode_remove(dvbdev->intf_devnode);
230 dvbdev->intf_devnode = NULL;
231 }
232
233 if (dvbdev->adapter->conn) {
234 media_device_unregister_entity(dvbdev->adapter->conn);
235 kfree(dvbdev->adapter->conn);
236 dvbdev->adapter->conn = NULL;
237 kfree(dvbdev->adapter->conn_pads);
238 dvbdev->adapter->conn_pads = NULL;
239 }
240 #endif
241 }
242
243 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
dvb_create_tsout_entity(struct dvb_device * dvbdev,const char * name,int npads)244 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
245 const char *name, int npads)
246 {
247 int i;
248
249 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
250 GFP_KERNEL);
251 if (!dvbdev->tsout_pads)
252 return -ENOMEM;
253
254 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
255 GFP_KERNEL);
256 if (!dvbdev->tsout_entity)
257 return -ENOMEM;
258
259 dvbdev->tsout_num_entities = npads;
260
261 for (i = 0; i < npads; i++) {
262 struct media_pad *pads = &dvbdev->tsout_pads[i];
263 struct media_entity *entity = &dvbdev->tsout_entity[i];
264 int ret;
265
266 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
267 if (!entity->name)
268 return -ENOMEM;
269
270 entity->function = MEDIA_ENT_F_IO_DTV;
271 pads->flags = MEDIA_PAD_FL_SINK;
272
273 ret = media_entity_pads_init(entity, 1, pads);
274 if (ret < 0)
275 return ret;
276
277 ret = media_device_register_entity(dvbdev->adapter->mdev,
278 entity);
279 if (ret < 0)
280 return ret;
281 }
282 return 0;
283 }
284
285 #define DEMUX_TSOUT "demux-tsout"
286 #define DVR_TSOUT "dvr-tsout"
287
dvb_create_media_entity(struct dvb_device * dvbdev,int type,int demux_sink_pads)288 static int dvb_create_media_entity(struct dvb_device *dvbdev,
289 int type, int demux_sink_pads)
290 {
291 int i, ret, npads;
292
293 switch (type) {
294 case DVB_DEVICE_FRONTEND:
295 npads = 2;
296 break;
297 case DVB_DEVICE_DVR:
298 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
299 demux_sink_pads);
300 return ret;
301 case DVB_DEVICE_DEMUX:
302 npads = 1 + demux_sink_pads;
303 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
304 demux_sink_pads);
305 if (ret < 0)
306 return ret;
307 break;
308 case DVB_DEVICE_CA:
309 npads = 2;
310 break;
311 case DVB_DEVICE_NET:
312 /*
313 * We should be creating entities for the MPE/ULE
314 * decapsulation hardware (or software implementation).
315 *
316 * However, the number of for the MPE/ULE decaps may not be
317 * fixed. As we don't have yet dynamic support for PADs at
318 * the Media Controller, let's not create the decap
319 * entities yet.
320 */
321 return 0;
322 default:
323 return 0;
324 }
325
326 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
327 if (!dvbdev->entity)
328 return -ENOMEM;
329
330 dvbdev->entity->name = dvbdev->name;
331
332 if (npads) {
333 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
334 GFP_KERNEL);
335 if (!dvbdev->pads) {
336 kfree(dvbdev->entity);
337 dvbdev->entity = NULL;
338 return -ENOMEM;
339 }
340 }
341
342 switch (type) {
343 case DVB_DEVICE_FRONTEND:
344 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
345 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
346 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
347 break;
348 case DVB_DEVICE_DEMUX:
349 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
350 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
351 for (i = 1; i < npads; i++)
352 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
353 break;
354 case DVB_DEVICE_CA:
355 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
356 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
357 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
358 break;
359 default:
360 /* Should never happen, as the first switch prevents it */
361 kfree(dvbdev->entity);
362 kfree(dvbdev->pads);
363 dvbdev->entity = NULL;
364 dvbdev->pads = NULL;
365 return 0;
366 }
367
368 if (npads) {
369 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
370 if (ret)
371 return ret;
372 }
373 ret = media_device_register_entity(dvbdev->adapter->mdev,
374 dvbdev->entity);
375 if (ret)
376 return ret;
377
378 pr_info("%s: media entity '%s' registered.\n",
379 __func__, dvbdev->entity->name);
380
381 return 0;
382 }
383 #endif
384
dvb_register_media_device(struct dvb_device * dvbdev,int type,int minor,unsigned int demux_sink_pads)385 static int dvb_register_media_device(struct dvb_device *dvbdev,
386 int type, int minor,
387 unsigned int demux_sink_pads)
388 {
389 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
390 struct media_link *link;
391 u32 intf_type;
392 int ret;
393
394 if (!dvbdev->adapter->mdev)
395 return 0;
396
397 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
398 if (ret)
399 return ret;
400
401 switch (type) {
402 case DVB_DEVICE_FRONTEND:
403 intf_type = MEDIA_INTF_T_DVB_FE;
404 break;
405 case DVB_DEVICE_DEMUX:
406 intf_type = MEDIA_INTF_T_DVB_DEMUX;
407 break;
408 case DVB_DEVICE_DVR:
409 intf_type = MEDIA_INTF_T_DVB_DVR;
410 break;
411 case DVB_DEVICE_CA:
412 intf_type = MEDIA_INTF_T_DVB_CA;
413 break;
414 case DVB_DEVICE_NET:
415 intf_type = MEDIA_INTF_T_DVB_NET;
416 break;
417 default:
418 return 0;
419 }
420
421 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
422 intf_type, 0,
423 DVB_MAJOR, minor);
424
425 if (!dvbdev->intf_devnode)
426 return -ENOMEM;
427
428 /*
429 * Create the "obvious" link, e. g. the ones that represent
430 * a direct association between an interface and an entity.
431 * Other links should be created elsewhere, like:
432 * DVB FE intf -> tuner
433 * DVB demux intf -> dvr
434 */
435
436 if (!dvbdev->entity)
437 return 0;
438
439 link = media_create_intf_link(dvbdev->entity,
440 &dvbdev->intf_devnode->intf,
441 MEDIA_LNK_FL_ENABLED |
442 MEDIA_LNK_FL_IMMUTABLE);
443 if (!link)
444 return -ENOMEM;
445 #endif
446 return 0;
447 }
448
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)449 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
450 const struct dvb_device *template, void *priv,
451 enum dvb_device_type type, int demux_sink_pads)
452 {
453 struct dvb_device *dvbdev;
454 struct file_operations *dvbdevfops = NULL;
455 struct dvbdevfops_node *node = NULL, *new_node = NULL;
456 struct device *clsdev;
457 int minor;
458 int id, ret;
459
460 mutex_lock(&dvbdev_register_lock);
461
462 id = dvbdev_get_free_id(adap, type);
463 if (id < 0) {
464 mutex_unlock(&dvbdev_register_lock);
465 *pdvbdev = NULL;
466 pr_err("%s: couldn't find free device id\n", __func__);
467 return -ENFILE;
468 }
469
470 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
471 if (!dvbdev) {
472 mutex_unlock(&dvbdev_register_lock);
473 return -ENOMEM;
474 }
475
476 /*
477 * When a device of the same type is probe()d more than once,
478 * the first allocated fops are used. This prevents memory leaks
479 * that can occur when the same device is probe()d repeatedly.
480 */
481 list_for_each_entry(node, &dvbdevfops_list, list_head) {
482 if (node->fops->owner == adap->module &&
483 node->type == type && node->template == template) {
484 dvbdevfops = node->fops;
485 break;
486 }
487 }
488
489 if (!dvbdevfops) {
490 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
491 if (!dvbdevfops) {
492 kfree(dvbdev);
493 *pdvbdev = NULL;
494 mutex_unlock(&dvbdev_register_lock);
495 return -ENOMEM;
496 }
497
498 new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
499 if (!new_node) {
500 kfree(dvbdevfops);
501 kfree(dvbdev);
502 *pdvbdev = NULL;
503 mutex_unlock(&dvbdev_register_lock);
504 return -ENOMEM;
505 }
506
507 new_node->fops = dvbdevfops;
508 new_node->type = type;
509 new_node->template = template;
510 list_add_tail(&new_node->list_head, &dvbdevfops_list);
511 }
512
513 memcpy(dvbdev, template, sizeof(struct dvb_device));
514 kref_init(&dvbdev->ref);
515 dvbdev->type = type;
516 dvbdev->id = id;
517 dvbdev->adapter = adap;
518 dvbdev->priv = priv;
519 dvbdev->fops = dvbdevfops;
520 init_waitqueue_head(&dvbdev->wait_queue);
521 dvbdevfops->owner = adap->module;
522 list_add_tail(&dvbdev->list_head, &adap->device_list);
523 down_write(&minor_rwsem);
524 #ifdef CONFIG_DVB_DYNAMIC_MINORS
525 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
526 if (!dvb_minors[minor])
527 break;
528 if (minor == MAX_DVB_MINORS) {
529 if (new_node) {
530 list_del(&new_node->list_head);
531 kfree(dvbdevfops);
532 kfree(new_node);
533 }
534 list_del(&dvbdev->list_head);
535 kfree(dvbdev);
536 *pdvbdev = NULL;
537 up_write(&minor_rwsem);
538 mutex_unlock(&dvbdev_register_lock);
539 return -EINVAL;
540 }
541 #else
542 minor = nums2minor(adap->num, type, id);
543 #endif
544 dvbdev->minor = minor;
545 dvb_minors[minor] = dvb_device_get(dvbdev);
546 up_write(&minor_rwsem);
547 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
548 if (ret) {
549 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
550 __func__);
551 if (new_node) {
552 list_del(&new_node->list_head);
553 kfree(dvbdevfops);
554 kfree(new_node);
555 }
556 dvb_media_device_free(dvbdev);
557 list_del(&dvbdev->list_head);
558 kfree(dvbdev);
559 *pdvbdev = NULL;
560 mutex_unlock(&dvbdev_register_lock);
561 return ret;
562 }
563
564 clsdev = device_create(dvb_class, adap->device,
565 MKDEV(DVB_MAJOR, minor),
566 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
567 if (IS_ERR(clsdev)) {
568 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
569 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
570 if (new_node) {
571 list_del(&new_node->list_head);
572 kfree(dvbdevfops);
573 kfree(new_node);
574 }
575 dvb_media_device_free(dvbdev);
576 list_del(&dvbdev->list_head);
577 kfree(dvbdev);
578 *pdvbdev = NULL;
579 mutex_unlock(&dvbdev_register_lock);
580 return PTR_ERR(clsdev);
581 }
582
583 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
584 adap->num, dnames[type], id, minor, minor);
585
586 mutex_unlock(&dvbdev_register_lock);
587 return 0;
588 }
589 EXPORT_SYMBOL(dvb_register_device);
590
dvb_remove_device(struct dvb_device * dvbdev)591 void dvb_remove_device(struct dvb_device *dvbdev)
592 {
593 if (!dvbdev)
594 return;
595
596 down_write(&minor_rwsem);
597 dvb_minors[dvbdev->minor] = NULL;
598 dvb_device_put(dvbdev);
599 up_write(&minor_rwsem);
600
601 dvb_media_device_free(dvbdev);
602
603 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
604
605 list_del(&dvbdev->list_head);
606 }
607 EXPORT_SYMBOL(dvb_remove_device);
608
dvb_free_device(struct kref * ref)609 static void dvb_free_device(struct kref *ref)
610 {
611 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
612
613 kfree(dvbdev);
614 }
615
dvb_device_get(struct dvb_device * dvbdev)616 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
617 {
618 kref_get(&dvbdev->ref);
619 return dvbdev;
620 }
621 EXPORT_SYMBOL(dvb_device_get);
622
dvb_device_put(struct dvb_device * dvbdev)623 void dvb_device_put(struct dvb_device *dvbdev)
624 {
625 if (dvbdev)
626 kref_put(&dvbdev->ref, dvb_free_device);
627 }
628
dvb_unregister_device(struct dvb_device * dvbdev)629 void dvb_unregister_device(struct dvb_device *dvbdev)
630 {
631 dvb_remove_device(dvbdev);
632 dvb_device_put(dvbdev);
633 }
634 EXPORT_SYMBOL(dvb_unregister_device);
635
636 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
637
dvb_create_io_intf_links(struct dvb_adapter * adap,struct media_interface * intf,char * name)638 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
639 struct media_interface *intf,
640 char *name)
641 {
642 struct media_device *mdev = adap->mdev;
643 struct media_entity *entity;
644 struct media_link *link;
645
646 media_device_for_each_entity(entity, mdev) {
647 if (entity->function == MEDIA_ENT_F_IO_DTV) {
648 if (strncmp(entity->name, name, strlen(name)))
649 continue;
650 link = media_create_intf_link(entity, intf,
651 MEDIA_LNK_FL_ENABLED |
652 MEDIA_LNK_FL_IMMUTABLE);
653 if (!link)
654 return -ENOMEM;
655 }
656 }
657 return 0;
658 }
659
dvb_create_media_graph(struct dvb_adapter * adap,bool create_rf_connector)660 int dvb_create_media_graph(struct dvb_adapter *adap,
661 bool create_rf_connector)
662 {
663 struct media_device *mdev = adap->mdev;
664 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
665 struct media_entity *demux = NULL, *ca = NULL;
666 struct media_link *link;
667 struct media_interface *intf;
668 unsigned int demux_pad = 0;
669 unsigned int dvr_pad = 0;
670 unsigned int ntuner = 0, ndemod = 0;
671 int ret, pad_source, pad_sink;
672 static const char *connector_name = "Television";
673
674 if (!mdev)
675 return 0;
676
677 media_device_for_each_entity(entity, mdev) {
678 switch (entity->function) {
679 case MEDIA_ENT_F_TUNER:
680 tuner = entity;
681 ntuner++;
682 break;
683 case MEDIA_ENT_F_DTV_DEMOD:
684 demod = entity;
685 ndemod++;
686 break;
687 case MEDIA_ENT_F_TS_DEMUX:
688 demux = entity;
689 break;
690 case MEDIA_ENT_F_DTV_CA:
691 ca = entity;
692 break;
693 }
694 }
695
696 /*
697 * Prepare to signalize to media_create_pad_links() that multiple
698 * entities of the same type exists and a 1:n or n:1 links need to be
699 * created.
700 * NOTE: if both tuner and demod have multiple instances, it is up
701 * to the caller driver to create such links.
702 */
703 if (ntuner > 1)
704 tuner = NULL;
705 if (ndemod > 1)
706 demod = NULL;
707
708 if (create_rf_connector) {
709 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
710 if (!conn)
711 return -ENOMEM;
712 adap->conn = conn;
713
714 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
715 if (!adap->conn_pads)
716 return -ENOMEM;
717
718 conn->flags = MEDIA_ENT_FL_CONNECTOR;
719 conn->function = MEDIA_ENT_F_CONN_RF;
720 conn->name = connector_name;
721 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
722
723 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
724 if (ret)
725 return ret;
726
727 ret = media_device_register_entity(mdev, conn);
728 if (ret)
729 return ret;
730
731 if (!ntuner) {
732 ret = media_create_pad_links(mdev,
733 MEDIA_ENT_F_CONN_RF,
734 conn, 0,
735 MEDIA_ENT_F_DTV_DEMOD,
736 demod, 0,
737 MEDIA_LNK_FL_ENABLED,
738 false);
739 } else {
740 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK,
741 PAD_SIGNAL_ANALOG);
742 if (pad_sink < 0)
743 return -EINVAL;
744 ret = media_create_pad_links(mdev,
745 MEDIA_ENT_F_CONN_RF,
746 conn, 0,
747 MEDIA_ENT_F_TUNER,
748 tuner, pad_sink,
749 MEDIA_LNK_FL_ENABLED,
750 false);
751 }
752 if (ret)
753 return ret;
754 }
755
756 if (ntuner && ndemod) {
757 /* NOTE: first found tuner source pad presumed correct */
758 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE,
759 PAD_SIGNAL_ANALOG);
760 if (pad_source < 0)
761 return -EINVAL;
762 ret = media_create_pad_links(mdev,
763 MEDIA_ENT_F_TUNER,
764 tuner, pad_source,
765 MEDIA_ENT_F_DTV_DEMOD,
766 demod, 0, MEDIA_LNK_FL_ENABLED,
767 false);
768 if (ret)
769 return ret;
770 }
771
772 if (ndemod && demux) {
773 ret = media_create_pad_links(mdev,
774 MEDIA_ENT_F_DTV_DEMOD,
775 demod, 1,
776 MEDIA_ENT_F_TS_DEMUX,
777 demux, 0, MEDIA_LNK_FL_ENABLED,
778 false);
779 if (ret)
780 return ret;
781 }
782 if (demux && ca) {
783 ret = media_create_pad_link(demux, 1, ca,
784 0, MEDIA_LNK_FL_ENABLED);
785 if (ret)
786 return ret;
787 }
788
789 /* Create demux links for each ringbuffer/pad */
790 if (demux) {
791 media_device_for_each_entity(entity, mdev) {
792 if (entity->function == MEDIA_ENT_F_IO_DTV) {
793 if (!strncmp(entity->name, DVR_TSOUT,
794 strlen(DVR_TSOUT))) {
795 ret = media_create_pad_link(demux,
796 ++dvr_pad,
797 entity, 0, 0);
798 if (ret)
799 return ret;
800 }
801 if (!strncmp(entity->name, DEMUX_TSOUT,
802 strlen(DEMUX_TSOUT))) {
803 ret = media_create_pad_link(demux,
804 ++demux_pad,
805 entity, 0, 0);
806 if (ret)
807 return ret;
808 }
809 }
810 }
811 }
812
813 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
814 media_device_for_each_intf(intf, mdev) {
815 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
816 link = media_create_intf_link(ca, intf,
817 MEDIA_LNK_FL_ENABLED |
818 MEDIA_LNK_FL_IMMUTABLE);
819 if (!link)
820 return -ENOMEM;
821 }
822
823 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
824 link = media_create_intf_link(tuner, intf,
825 MEDIA_LNK_FL_ENABLED |
826 MEDIA_LNK_FL_IMMUTABLE);
827 if (!link)
828 return -ENOMEM;
829 }
830 #if 0
831 /*
832 * Indirect link - let's not create yet, as we don't know how
833 * to handle indirect links, nor if this will
834 * actually be needed.
835 */
836 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
837 link = media_create_intf_link(demux, intf,
838 MEDIA_LNK_FL_ENABLED |
839 MEDIA_LNK_FL_IMMUTABLE);
840 if (!link)
841 return -ENOMEM;
842 }
843 #endif
844 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
845 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
846 if (ret)
847 return ret;
848 }
849 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
850 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
851 if (ret)
852 return ret;
853 }
854 }
855 return 0;
856 }
857 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
858 #endif
859
dvbdev_check_free_adapter_num(int num)860 static int dvbdev_check_free_adapter_num(int num)
861 {
862 struct list_head *entry;
863
864 list_for_each(entry, &dvb_adapter_list) {
865 struct dvb_adapter *adap;
866
867 adap = list_entry(entry, struct dvb_adapter, list_head);
868 if (adap->num == num)
869 return 0;
870 }
871 return 1;
872 }
873
dvbdev_get_free_adapter_num(void)874 static int dvbdev_get_free_adapter_num(void)
875 {
876 int num = 0;
877
878 while (num < DVB_MAX_ADAPTERS) {
879 if (dvbdev_check_free_adapter_num(num))
880 return num;
881 num++;
882 }
883
884 return -ENFILE;
885 }
886
dvb_register_adapter(struct dvb_adapter * adap,const char * name,struct module * module,struct device * device,short * adapter_nums)887 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
888 struct module *module, struct device *device,
889 short *adapter_nums)
890 {
891 int i, num;
892
893 mutex_lock(&dvbdev_register_lock);
894
895 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
896 num = adapter_nums[i];
897 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
898 /* use the one the driver asked for */
899 if (dvbdev_check_free_adapter_num(num))
900 break;
901 } else {
902 num = dvbdev_get_free_adapter_num();
903 break;
904 }
905 num = -1;
906 }
907
908 if (num < 0) {
909 mutex_unlock(&dvbdev_register_lock);
910 return -ENFILE;
911 }
912
913 memset(adap, 0, sizeof(struct dvb_adapter));
914 INIT_LIST_HEAD(&adap->device_list);
915
916 pr_info("DVB: registering new adapter (%s)\n", name);
917
918 adap->num = num;
919 adap->name = name;
920 adap->module = module;
921 adap->device = device;
922 adap->mfe_shared = 0;
923 adap->mfe_dvbdev = NULL;
924 mutex_init(&adap->mfe_lock);
925
926 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
927 mutex_init(&adap->mdev_lock);
928 #endif
929
930 list_add_tail(&adap->list_head, &dvb_adapter_list);
931
932 mutex_unlock(&dvbdev_register_lock);
933
934 return num;
935 }
936 EXPORT_SYMBOL(dvb_register_adapter);
937
dvb_unregister_adapter(struct dvb_adapter * adap)938 int dvb_unregister_adapter(struct dvb_adapter *adap)
939 {
940 mutex_lock(&dvbdev_register_lock);
941 list_del(&adap->list_head);
942 mutex_unlock(&dvbdev_register_lock);
943 return 0;
944 }
945 EXPORT_SYMBOL(dvb_unregister_adapter);
946
947 /*
948 * if the miracle happens and "generic_usercopy()" is included into
949 * the kernel, then this can vanish. please don't make the mistake and
950 * define this as video_usercopy(). this will introduce a dependency
951 * to the v4l "videodev.o" module, which is unnecessary for some
952 * cards (ie. the budget dvb-cards don't need the v4l module...)
953 */
dvb_usercopy(struct file * file,unsigned int cmd,unsigned long arg,int (* func)(struct file * file,unsigned int cmd,void * arg))954 int dvb_usercopy(struct file *file,
955 unsigned int cmd, unsigned long arg,
956 int (*func)(struct file *file,
957 unsigned int cmd, void *arg))
958 {
959 char sbuf[128] = {};
960 void *mbuf = NULL;
961 void *parg = NULL;
962 int err = -EINVAL;
963
964 /* Copy arguments into temp kernel buffer */
965 switch (_IOC_DIR(cmd)) {
966 case _IOC_NONE:
967 /*
968 * For this command, the pointer is actually an integer
969 * argument.
970 */
971 parg = (void *)arg;
972 break;
973 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
974 case _IOC_WRITE:
975 case (_IOC_WRITE | _IOC_READ):
976 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
977 parg = sbuf;
978 } else {
979 /* too big to allocate from stack */
980 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
981 if (!mbuf)
982 return -ENOMEM;
983 parg = mbuf;
984 }
985
986 err = -EFAULT;
987 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
988 goto out;
989 break;
990 }
991
992 /* call driver */
993 err = func(file, cmd, parg);
994 if (err == -ENOIOCTLCMD)
995 err = -ENOTTY;
996
997 if (err < 0)
998 goto out;
999
1000 /* Copy results into user buffer */
1001 switch (_IOC_DIR(cmd)) {
1002 case _IOC_READ:
1003 case (_IOC_WRITE | _IOC_READ):
1004 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
1005 err = -EFAULT;
1006 break;
1007 }
1008
1009 out:
1010 kfree(mbuf);
1011 return err;
1012 }
1013
1014 #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)1015 struct i2c_client *dvb_module_probe(const char *module_name,
1016 const char *name,
1017 struct i2c_adapter *adap,
1018 unsigned char addr,
1019 void *platform_data)
1020 {
1021 struct i2c_client *client;
1022 struct i2c_board_info *board_info;
1023
1024 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
1025 if (!board_info)
1026 return NULL;
1027
1028 if (name)
1029 strscpy(board_info->type, name, I2C_NAME_SIZE);
1030 else
1031 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1032
1033 board_info->addr = addr;
1034 board_info->platform_data = platform_data;
1035 request_module(module_name);
1036 client = i2c_new_client_device(adap, board_info);
1037 if (!i2c_client_has_driver(client)) {
1038 kfree(board_info);
1039 return NULL;
1040 }
1041
1042 if (!try_module_get(client->dev.driver->owner)) {
1043 i2c_unregister_device(client);
1044 client = NULL;
1045 }
1046
1047 kfree(board_info);
1048 return client;
1049 }
1050 EXPORT_SYMBOL_GPL(dvb_module_probe);
1051
dvb_module_release(struct i2c_client * client)1052 void dvb_module_release(struct i2c_client *client)
1053 {
1054 if (!client)
1055 return;
1056
1057 module_put(client->dev.driver->owner);
1058 i2c_unregister_device(client);
1059 }
1060 EXPORT_SYMBOL_GPL(dvb_module_release);
1061 #endif
1062
dvb_uevent(const struct device * dev,struct kobj_uevent_env * env)1063 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)
1064 {
1065 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1066
1067 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1068 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1069 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1070 return 0;
1071 }
1072
dvb_devnode(const struct device * dev,umode_t * mode)1073 static char *dvb_devnode(const struct device *dev, umode_t *mode)
1074 {
1075 const struct dvb_device *dvbdev = dev_get_drvdata(dev);
1076
1077 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1078 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1079 }
1080
init_dvbdev(void)1081 static int __init init_dvbdev(void)
1082 {
1083 int retval;
1084 dev_t dev = MKDEV(DVB_MAJOR, 0);
1085
1086 retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB");
1087 if (retval != 0) {
1088 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1089 return retval;
1090 }
1091
1092 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1093 retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS);
1094 if (retval != 0) {
1095 pr_err("dvb-core: unable register character device\n");
1096 goto error;
1097 }
1098
1099 dvb_class = class_create("dvb");
1100 if (IS_ERR(dvb_class)) {
1101 retval = PTR_ERR(dvb_class);
1102 goto error;
1103 }
1104 dvb_class->dev_uevent = dvb_uevent;
1105 dvb_class->devnode = dvb_devnode;
1106 return 0;
1107
1108 error:
1109 cdev_del(&dvb_device_cdev);
1110 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1111 return retval;
1112 }
1113
exit_dvbdev(void)1114 static void __exit exit_dvbdev(void)
1115 {
1116 struct dvbdevfops_node *node, *next;
1117
1118 class_destroy(dvb_class);
1119 cdev_del(&dvb_device_cdev);
1120 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1121
1122 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {
1123 list_del(&node->list_head);
1124 kfree(node->fops);
1125 kfree(node);
1126 }
1127 }
1128
1129 subsys_initcall(init_dvbdev);
1130 module_exit(exit_dvbdev);
1131
1132 MODULE_DESCRIPTION("DVB Core Driver");
1133 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1134 MODULE_LICENSE("GPL");
1135