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 | |
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(sem: &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(sem: &minor_rwsem); |
106 | mutex_unlock(lock: &dvbdev_mutex); |
107 | if (err) |
108 | dvb_device_put(dvbdev); |
109 | return err; |
110 | } |
111 | fail: |
112 | up_read(sem: &minor_rwsem); |
113 | mutex_unlock(lock: &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 | |
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 | |
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 | |
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, func: dvbdev->kernel_ioctl); |
182 | } |
183 | EXPORT_SYMBOL(dvb_generic_ioctl); |
184 | |
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 | |
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(entity: dvbdev->entity); |
207 | kfree(objp: dvbdev->entity); |
208 | kfree(objp: 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(entity: &dvbdev->tsout_entity[i]); |
218 | kfree(objp: dvbdev->tsout_entity[i].name); |
219 | } |
220 | kfree(objp: dvbdev->tsout_entity); |
221 | kfree(objp: 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(devnode: dvbdev->intf_devnode); |
230 | dvbdev->intf_devnode = NULL; |
231 | } |
232 | |
233 | if (dvbdev->adapter->conn) { |
234 | media_device_unregister_entity(entity: dvbdev->adapter->conn); |
235 | kfree(objp: dvbdev->adapter->conn); |
236 | dvbdev->adapter->conn = NULL; |
237 | kfree(objp: dvbdev->adapter->conn_pads); |
238 | dvbdev->adapter->conn_pads = NULL; |
239 | } |
240 | #endif |
241 | } |
242 | |
243 | #if defined(CONFIG_MEDIA_CONTROLLER_DVB) |
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(n: npads, size: sizeof(*dvbdev->tsout_pads), |
250 | GFP_KERNEL); |
251 | if (!dvbdev->tsout_pads) |
252 | return -ENOMEM; |
253 | |
254 | dvbdev->tsout_entity = kcalloc(n: npads, size: 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, fmt: "%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, num_pads: 1, pads); |
274 | if (ret < 0) |
275 | return ret; |
276 | |
277 | ret = media_device_register_entity(mdev: 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 | |
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 | npads: 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 | npads: 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(size: 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(n: npads, size: sizeof(*dvbdev->pads), |
334 | GFP_KERNEL); |
335 | if (!dvbdev->pads) { |
336 | kfree(objp: 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(objp: dvbdev->entity); |
362 | kfree(objp: dvbdev->pads); |
363 | dvbdev->entity = NULL; |
364 | dvbdev->pads = NULL; |
365 | return 0; |
366 | } |
367 | |
368 | if (npads) { |
369 | ret = media_entity_pads_init(entity: dvbdev->entity, num_pads: npads, pads: dvbdev->pads); |
370 | if (ret) |
371 | return ret; |
372 | } |
373 | ret = media_device_register_entity(mdev: dvbdev->adapter->mdev, |
374 | entity: 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 | |
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(mdev: dvbdev->adapter->mdev, |
422 | type: intf_type, flags: 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(entity: dvbdev->entity, |
440 | intf: &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 | |
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(lock: &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(size: sizeof(*dvbdev), GFP_KERNEL); |
471 | if (!dvbdev) { |
472 | mutex_unlock(lock: &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(p: template->fops, size: sizeof(*dvbdevfops), GFP_KERNEL); |
491 | if (!dvbdevfops) { |
492 | kfree(objp: dvbdev); |
493 | *pdvbdev = NULL; |
494 | mutex_unlock(lock: &dvbdev_register_lock); |
495 | return -ENOMEM; |
496 | } |
497 | |
498 | new_node = kzalloc(size: sizeof(*new_node), GFP_KERNEL); |
499 | if (!new_node) { |
500 | kfree(objp: dvbdevfops); |
501 | kfree(objp: dvbdev); |
502 | *pdvbdev = NULL; |
503 | mutex_unlock(lock: &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: &new_node->list_head, head: &dvbdevfops_list); |
511 | } |
512 | |
513 | memcpy(dvbdev, template, sizeof(struct dvb_device)); |
514 | kref_init(kref: &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(new: &dvbdev->list_head, head: &adap->device_list); |
523 | down_write(sem: &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(entry: &new_node->list_head); |
531 | kfree(objp: dvbdevfops); |
532 | kfree(objp: new_node); |
533 | } |
534 | list_del(entry: &dvbdev->list_head); |
535 | kfree(objp: dvbdev); |
536 | *pdvbdev = NULL; |
537 | up_write(sem: &minor_rwsem); |
538 | mutex_unlock(lock: &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(sem: &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(entry: &new_node->list_head); |
553 | kfree(objp: dvbdevfops); |
554 | kfree(objp: new_node); |
555 | } |
556 | dvb_media_device_free(dvbdev); |
557 | list_del(entry: &dvbdev->list_head); |
558 | kfree(objp: dvbdev); |
559 | *pdvbdev = NULL; |
560 | mutex_unlock(lock: &dvbdev_register_lock); |
561 | return ret; |
562 | } |
563 | |
564 | clsdev = device_create(cls: dvb_class, parent: adap->device, |
565 | MKDEV(DVB_MAJOR, minor), |
566 | drvdata: dvbdev, fmt: "dvb%d.%s%d" , adap->num, dnames[type], id); |
567 | if (IS_ERR(ptr: 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(entry: &new_node->list_head); |
572 | kfree(objp: dvbdevfops); |
573 | kfree(objp: new_node); |
574 | } |
575 | dvb_media_device_free(dvbdev); |
576 | list_del(entry: &dvbdev->list_head); |
577 | kfree(objp: dvbdev); |
578 | *pdvbdev = NULL; |
579 | mutex_unlock(lock: &dvbdev_register_lock); |
580 | return PTR_ERR(ptr: 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(lock: &dvbdev_register_lock); |
587 | return 0; |
588 | } |
589 | EXPORT_SYMBOL(dvb_register_device); |
590 | |
591 | void dvb_remove_device(struct dvb_device *dvbdev) |
592 | { |
593 | if (!dvbdev) |
594 | return; |
595 | |
596 | down_write(sem: &minor_rwsem); |
597 | dvb_minors[dvbdev->minor] = NULL; |
598 | dvb_device_put(dvbdev); |
599 | up_write(sem: &minor_rwsem); |
600 | |
601 | dvb_media_device_free(dvbdev); |
602 | |
603 | device_destroy(cls: dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); |
604 | |
605 | list_del(entry: &dvbdev->list_head); |
606 | } |
607 | EXPORT_SYMBOL(dvb_remove_device); |
608 | |
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(objp: dvbdev); |
614 | } |
615 | |
616 | struct dvb_device *dvb_device_get(struct dvb_device *dvbdev) |
617 | { |
618 | kref_get(kref: &dvbdev->ref); |
619 | return dvbdev; |
620 | } |
621 | EXPORT_SYMBOL(dvb_device_get); |
622 | |
623 | void dvb_device_put(struct dvb_device *dvbdev) |
624 | { |
625 | if (dvbdev) |
626 | kref_put(kref: &dvbdev->ref, release: dvb_free_device); |
627 | } |
628 | |
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 | |
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 | |
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(size: sizeof(*conn), GFP_KERNEL); |
710 | if (!conn) |
711 | return -ENOMEM; |
712 | adap->conn = conn; |
713 | |
714 | adap->conn_pads = kzalloc(size: 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(entity: conn, num_pads: 1, pads: adap->conn_pads); |
724 | if (ret) |
725 | return ret; |
726 | |
727 | ret = media_device_register_entity(mdev, entity: 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 | source: conn, source_pad: 0, |
735 | MEDIA_ENT_F_DTV_DEMOD, |
736 | sink: demod, sink_pad: 0, |
737 | MEDIA_LNK_FL_ENABLED, |
738 | allow_both_undefined: false); |
739 | } else { |
740 | pad_sink = media_get_pad_index(entity: tuner, MEDIA_PAD_FL_SINK, |
741 | sig_type: 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 | source: conn, source_pad: 0, |
747 | MEDIA_ENT_F_TUNER, |
748 | sink: tuner, sink_pad: pad_sink, |
749 | MEDIA_LNK_FL_ENABLED, |
750 | allow_both_undefined: 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(entity: tuner, MEDIA_PAD_FL_SOURCE, |
759 | sig_type: PAD_SIGNAL_ANALOG); |
760 | if (pad_source < 0) |
761 | return -EINVAL; |
762 | ret = media_create_pad_links(mdev, |
763 | MEDIA_ENT_F_TUNER, |
764 | source: tuner, source_pad: pad_source, |
765 | MEDIA_ENT_F_DTV_DEMOD, |
766 | sink: demod, sink_pad: 0, MEDIA_LNK_FL_ENABLED, |
767 | allow_both_undefined: 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 | source: demod, source_pad: 1, |
776 | MEDIA_ENT_F_TS_DEMUX, |
777 | sink: demux, sink_pad: 0, MEDIA_LNK_FL_ENABLED, |
778 | allow_both_undefined: false); |
779 | if (ret) |
780 | return ret; |
781 | } |
782 | if (demux && ca) { |
783 | ret = media_create_pad_link(source: demux, source_pad: 1, sink: ca, |
784 | sink_pad: 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(source: demux, |
796 | source_pad: ++dvr_pad, |
797 | sink: entity, sink_pad: 0, flags: 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(source: demux, |
804 | source_pad: ++demux_pad, |
805 | sink: entity, sink_pad: 0, flags: 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(entity: 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(entity: 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 | |
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 | |
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 | |
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(lock: &dvbdev_register_lock); |
910 | return -ENFILE; |
911 | } |
912 | |
913 | memset(adap, 0, sizeof(struct dvb_adapter)); |
914 | INIT_LIST_HEAD(list: &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(new: &adap->list_head, head: &dvb_adapter_list); |
931 | |
932 | mutex_unlock(lock: &dvbdev_register_lock); |
933 | |
934 | return num; |
935 | } |
936 | EXPORT_SYMBOL(dvb_register_adapter); |
937 | |
938 | int dvb_unregister_adapter(struct dvb_adapter *adap) |
939 | { |
940 | mutex_lock(&dvbdev_register_lock); |
941 | list_del(entry: &adap->list_head); |
942 | mutex_unlock(lock: &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 | */ |
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(to: parg, from: (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(to: (void __user *)arg, from: parg, _IOC_SIZE(cmd))) |
1005 | err = -EFAULT; |
1006 | break; |
1007 | } |
1008 | |
1009 | out: |
1010 | kfree(objp: mbuf); |
1011 | return err; |
1012 | } |
1013 | |
1014 | #if IS_ENABLED(CONFIG_I2C) |
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(size: 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, info: board_info); |
1037 | if (!i2c_client_has_driver(client)) { |
1038 | kfree(objp: board_info); |
1039 | return NULL; |
1040 | } |
1041 | |
1042 | if (!try_module_get(module: client->dev.driver->owner)) { |
1043 | i2c_unregister_device(client); |
1044 | client = NULL; |
1045 | } |
1046 | |
1047 | kfree(objp: board_info); |
1048 | return client; |
1049 | } |
1050 | EXPORT_SYMBOL_GPL(dvb_module_probe); |
1051 | |
1052 | void dvb_module_release(struct i2c_client *client) |
1053 | { |
1054 | if (!client) |
1055 | return; |
1056 | |
1057 | module_put(module: client->dev.driver->owner); |
1058 | i2c_unregister_device(client); |
1059 | } |
1060 | EXPORT_SYMBOL_GPL(dvb_module_release); |
1061 | #endif |
1062 | |
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, format: "DVB_ADAPTER_NUM=%d" , dvbdev->adapter->num); |
1068 | add_uevent_var(env, format: "DVB_DEVICE_TYPE=%s" , dnames[dvbdev->type]); |
1069 | add_uevent_var(env, format: "DVB_DEVICE_NUM=%d" , dvbdev->id); |
1070 | return 0; |
1071 | } |
1072 | |
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, fmt: "dvb/adapter%d/%s%d" , |
1078 | dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); |
1079 | } |
1080 | |
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(name: "dvb" ); |
1100 | if (IS_ERR(ptr: dvb_class)) { |
1101 | retval = PTR_ERR(ptr: 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 | |
1114 | static void __exit exit_dvbdev(void) |
1115 | { |
1116 | struct dvbdevfops_node *node, *next; |
1117 | |
1118 | class_destroy(cls: 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(entry: &node->list_head); |
1124 | kfree(objp: node->fops); |
1125 | kfree(objp: 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 | |