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1// SPDX-License-Identifier: LGPL-2.1-or-later2/*3 * dvbdev.c4 *5 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>6 * & Marcus Metzler <marcus@convergence.de>7 * for convergence integrated media GmbH8 */9 10#define pr_fmt(fmt) "dvbdev: " fmt11 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 29static DEFINE_MUTEX(dvbdev_mutex);30static LIST_HEAD(dvbdevfops_list);31static int dvbdev_debug;32 33module_param(dvbdev_debug, int, 0644);34MODULE_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 42static LIST_HEAD(dvb_adapter_list);43static DEFINE_MUTEX(dvbdev_register_lock);44 45static 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_MINORS58#define MAX_DVB_MINORS 25659#define DVB_MAX_IDS MAX_DVB_MINORS60#else61#define DVB_MAX_IDS 462 63static 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#endif80 81static struct class *dvb_class;82 83static struct dvb_device *dvb_minors[MAX_DVB_MINORS];84static DECLARE_RWSEM(minor_rwsem);85 86static 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 }116fail:117 up_read(&minor_rwsem);118 mutex_unlock(&dvbdev_mutex);119 return -ENODEV;120}121 122static const struct file_operations dvb_device_fops = {123 .owner = THIS_MODULE,124 .open = dvb_device_open,125 .llseek = noop_llseek,126};127 128static struct cdev dvb_device_cdev;129 130int 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}153EXPORT_SYMBOL(dvb_generic_open);154 155int 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 else165 dvbdev->writers++;166 167 dvbdev->users++;168 169 dvb_device_put(dvbdev);170 171 return 0;172}173EXPORT_SYMBOL(dvb_generic_release);174 175long 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}188EXPORT_SYMBOL(dvb_generic_ioctl);189 190static 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;201skip:202 id++;203 }204 return -ENFILE;205}206 207static 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#endif246}247 248#if defined(CONFIG_MEDIA_CONTROLLER_DVB)249static int dvb_create_tsout_entity(struct dvb_device *dvbdev,250 const char *name, int npads)251{252 int i;253 254 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),255 GFP_KERNEL);256 if (!dvbdev->tsout_pads)257 return -ENOMEM;258 259 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),260 GFP_KERNEL);261 if (!dvbdev->tsout_entity)262 return -ENOMEM;263 264 dvbdev->tsout_num_entities = npads;265 266 for (i = 0; i < npads; i++) {267 struct media_pad *pads = &dvbdev->tsout_pads[i];268 struct media_entity *entity = &dvbdev->tsout_entity[i];269 int ret;270 271 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);272 if (!entity->name)273 return -ENOMEM;274 275 entity->function = MEDIA_ENT_F_IO_DTV;276 pads->flags = MEDIA_PAD_FL_SINK;277 278 ret = media_entity_pads_init(entity, 1, pads);279 if (ret < 0)280 return ret;281 282 ret = media_device_register_entity(dvbdev->adapter->mdev,283 entity);284 if (ret < 0)285 return ret;286 }287 return 0;288}289 290#define DEMUX_TSOUT "demux-tsout"291#define DVR_TSOUT "dvr-tsout"292 293static int dvb_create_media_entity(struct dvb_device *dvbdev,294 int type, int demux_sink_pads)295{296 int i, ret, npads;297 298 switch (type) {299 case DVB_DEVICE_FRONTEND:300 npads = 2;301 break;302 case DVB_DEVICE_DVR:303 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,304 demux_sink_pads);305 return ret;306 case DVB_DEVICE_DEMUX:307 npads = 1 + demux_sink_pads;308 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,309 demux_sink_pads);310 if (ret < 0)311 return ret;312 break;313 case DVB_DEVICE_CA:314 npads = 2;315 break;316 case DVB_DEVICE_NET:317 /*318 * We should be creating entities for the MPE/ULE319 * decapsulation hardware (or software implementation).320 *321 * However, the number of for the MPE/ULE decaps may not be322 * fixed. As we don't have yet dynamic support for PADs at323 * the Media Controller, let's not create the decap324 * entities yet.325 */326 return 0;327 default:328 return 0;329 }330 331 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);332 if (!dvbdev->entity)333 return -ENOMEM;334 335 dvbdev->entity->name = dvbdev->name;336 337 if (npads) {338 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),339 GFP_KERNEL);340 if (!dvbdev->pads) {341 kfree(dvbdev->entity);342 dvbdev->entity = NULL;343 return -ENOMEM;344 }345 }346 347 switch (type) {348 case DVB_DEVICE_FRONTEND:349 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;350 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;351 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;352 break;353 case DVB_DEVICE_DEMUX:354 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;355 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;356 for (i = 1; i < npads; i++)357 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;358 break;359 case DVB_DEVICE_CA:360 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;361 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;362 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;363 break;364 default:365 /* Should never happen, as the first switch prevents it */366 kfree(dvbdev->entity);367 kfree(dvbdev->pads);368 dvbdev->entity = NULL;369 dvbdev->pads = NULL;370 return 0;371 }372 373 if (npads) {374 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);375 if (ret)376 return ret;377 }378 ret = media_device_register_entity(dvbdev->adapter->mdev,379 dvbdev->entity);380 if (ret)381 return ret;382 383 pr_info("%s: media entity '%s' registered.\n",384 __func__, dvbdev->entity->name);385 386 return 0;387}388#endif389 390static int dvb_register_media_device(struct dvb_device *dvbdev,391 int type, int minor,392 unsigned int demux_sink_pads)393{394#if defined(CONFIG_MEDIA_CONTROLLER_DVB)395 struct media_link *link;396 u32 intf_type;397 int ret;398 399 if (!dvbdev->adapter->mdev)400 return 0;401 402 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);403 if (ret)404 return ret;405 406 switch (type) {407 case DVB_DEVICE_FRONTEND:408 intf_type = MEDIA_INTF_T_DVB_FE;409 break;410 case DVB_DEVICE_DEMUX:411 intf_type = MEDIA_INTF_T_DVB_DEMUX;412 break;413 case DVB_DEVICE_DVR:414 intf_type = MEDIA_INTF_T_DVB_DVR;415 break;416 case DVB_DEVICE_CA:417 intf_type = MEDIA_INTF_T_DVB_CA;418 break;419 case DVB_DEVICE_NET:420 intf_type = MEDIA_INTF_T_DVB_NET;421 break;422 default:423 return 0;424 }425 426 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,427 intf_type, 0,428 DVB_MAJOR, minor);429 430 if (!dvbdev->intf_devnode)431 return -ENOMEM;432 433 /*434 * Create the "obvious" link, e. g. the ones that represent435 * a direct association between an interface and an entity.436 * Other links should be created elsewhere, like:437 * DVB FE intf -> tuner438 * DVB demux intf -> dvr439 */440 441 if (!dvbdev->entity)442 return 0;443 444 link = media_create_intf_link(dvbdev->entity,445 &dvbdev->intf_devnode->intf,446 MEDIA_LNK_FL_ENABLED |447 MEDIA_LNK_FL_IMMUTABLE);448 if (!link)449 return -ENOMEM;450#endif451 return 0;452}453 454int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,455 const struct dvb_device *template, void *priv,456 enum dvb_device_type type, int demux_sink_pads)457{458 struct dvb_device *dvbdev;459 struct file_operations *dvbdevfops = NULL;460 struct dvbdevfops_node *node = NULL, *new_node = NULL;461 struct device *clsdev;462 int minor;463 int id, ret;464 465 mutex_lock(&dvbdev_register_lock);466 467 id = dvbdev_get_free_id(adap, type);468 if (id < 0) {469 mutex_unlock(&dvbdev_register_lock);470 *pdvbdev = NULL;471 pr_err("%s: couldn't find free device id\n", __func__);472 return -ENFILE;473 }474 475 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);476 if (!dvbdev) {477 mutex_unlock(&dvbdev_register_lock);478 return -ENOMEM;479 }480 481 /*482 * When a device of the same type is probe()d more than once,483 * the first allocated fops are used. This prevents memory leaks484 * that can occur when the same device is probe()d repeatedly.485 */486 list_for_each_entry(node, &dvbdevfops_list, list_head) {487 if (node->fops->owner == adap->module &&488 node->type == type && node->template == template) {489 dvbdevfops = node->fops;490 break;491 }492 }493 494 if (!dvbdevfops) {495 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);496 if (!dvbdevfops) {497 kfree(dvbdev);498 *pdvbdev = NULL;499 mutex_unlock(&dvbdev_register_lock);500 return -ENOMEM;501 }502 503 new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);504 if (!new_node) {505 kfree(dvbdevfops);506 kfree(dvbdev);507 *pdvbdev = NULL;508 mutex_unlock(&dvbdev_register_lock);509 return -ENOMEM;510 }511 512 new_node->fops = dvbdevfops;513 new_node->type = type;514 new_node->template = template;515 list_add_tail(&new_node->list_head, &dvbdevfops_list);516 }517 518 memcpy(dvbdev, template, sizeof(struct dvb_device));519 kref_init(&dvbdev->ref);520 dvbdev->type = type;521 dvbdev->id = id;522 dvbdev->adapter = adap;523 dvbdev->priv = priv;524 dvbdev->fops = dvbdevfops;525 init_waitqueue_head(&dvbdev->wait_queue);526 dvbdevfops->owner = adap->module;527 list_add_tail(&dvbdev->list_head, &adap->device_list);528 down_write(&minor_rwsem);529#ifdef CONFIG_DVB_DYNAMIC_MINORS530 for (minor = 0; minor < MAX_DVB_MINORS; minor++)531 if (!dvb_minors[minor])532 break;533#else534 minor = nums2minor(adap->num, type, id);535#endif536 if (minor >= MAX_DVB_MINORS) {537 if (new_node) {538 list_del(&new_node->list_head);539 kfree(dvbdevfops);540 kfree(new_node);541 }542 list_del(&dvbdev->list_head);543 kfree(dvbdev);544 *pdvbdev = NULL;545 up_write(&minor_rwsem);546 mutex_unlock(&dvbdev_register_lock);547 return -EINVAL;548 }549 550 dvbdev->minor = minor;551 dvb_minors[minor] = dvb_device_get(dvbdev);552 up_write(&minor_rwsem);553 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);554 if (ret) {555 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",556 __func__);557 if (new_node) {558 list_del(&new_node->list_head);559 kfree(dvbdevfops);560 kfree(new_node);561 }562 dvb_media_device_free(dvbdev);563 list_del(&dvbdev->list_head);564 kfree(dvbdev);565 *pdvbdev = NULL;566 mutex_unlock(&dvbdev_register_lock);567 return ret;568 }569 570 clsdev = device_create(dvb_class, adap->device,571 MKDEV(DVB_MAJOR, minor),572 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);573 if (IS_ERR(clsdev)) {574 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",575 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));576 if (new_node) {577 list_del(&new_node->list_head);578 kfree(dvbdevfops);579 kfree(new_node);580 }581 dvb_media_device_free(dvbdev);582 list_del(&dvbdev->list_head);583 kfree(dvbdev);584 *pdvbdev = NULL;585 mutex_unlock(&dvbdev_register_lock);586 return PTR_ERR(clsdev);587 }588 589 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",590 adap->num, dnames[type], id, minor, minor);591 592 mutex_unlock(&dvbdev_register_lock);593 return 0;594}595EXPORT_SYMBOL(dvb_register_device);596 597void dvb_remove_device(struct dvb_device *dvbdev)598{599 if (!dvbdev)600 return;601 602 down_write(&minor_rwsem);603 dvb_minors[dvbdev->minor] = NULL;604 dvb_device_put(dvbdev);605 up_write(&minor_rwsem);606 607 dvb_media_device_free(dvbdev);608 609 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));610 611 list_del(&dvbdev->list_head);612}613EXPORT_SYMBOL(dvb_remove_device);614 615static void dvb_free_device(struct kref *ref)616{617 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);618 619 kfree(dvbdev);620}621 622struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)623{624 kref_get(&dvbdev->ref);625 return dvbdev;626}627EXPORT_SYMBOL(dvb_device_get);628 629void dvb_device_put(struct dvb_device *dvbdev)630{631 if (dvbdev)632 kref_put(&dvbdev->ref, dvb_free_device);633}634 635void dvb_unregister_device(struct dvb_device *dvbdev)636{637 dvb_remove_device(dvbdev);638 dvb_device_put(dvbdev);639}640EXPORT_SYMBOL(dvb_unregister_device);641 642#ifdef CONFIG_MEDIA_CONTROLLER_DVB643 644static int dvb_create_io_intf_links(struct dvb_adapter *adap,645 struct media_interface *intf,646 char *name)647{648 struct media_device *mdev = adap->mdev;649 struct media_entity *entity;650 struct media_link *link;651 652 media_device_for_each_entity(entity, mdev) {653 if (entity->function == MEDIA_ENT_F_IO_DTV) {654 if (strncmp(entity->name, name, strlen(name)))655 continue;656 link = media_create_intf_link(entity, intf,657 MEDIA_LNK_FL_ENABLED |658 MEDIA_LNK_FL_IMMUTABLE);659 if (!link)660 return -ENOMEM;661 }662 }663 return 0;664}665 666int dvb_create_media_graph(struct dvb_adapter *adap,667 bool create_rf_connector)668{669 struct media_device *mdev = adap->mdev;670 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;671 struct media_entity *demux = NULL, *ca = NULL;672 struct media_link *link;673 struct media_interface *intf;674 unsigned int demux_pad = 0;675 unsigned int dvr_pad = 0;676 unsigned int ntuner = 0, ndemod = 0;677 int ret, pad_source, pad_sink;678 static const char *connector_name = "Television";679 680 if (!mdev)681 return 0;682 683 media_device_for_each_entity(entity, mdev) {684 switch (entity->function) {685 case MEDIA_ENT_F_TUNER:686 tuner = entity;687 ntuner++;688 break;689 case MEDIA_ENT_F_DTV_DEMOD:690 demod = entity;691 ndemod++;692 break;693 case MEDIA_ENT_F_TS_DEMUX:694 demux = entity;695 break;696 case MEDIA_ENT_F_DTV_CA:697 ca = entity;698 break;699 }700 }701 702 /*703 * Prepare to signalize to media_create_pad_links() that multiple704 * entities of the same type exists and a 1:n or n:1 links need to be705 * created.706 * NOTE: if both tuner and demod have multiple instances, it is up707 * to the caller driver to create such links.708 */709 if (ntuner > 1)710 tuner = NULL;711 if (ndemod > 1)712 demod = NULL;713 714 if (create_rf_connector) {715 conn = kzalloc(sizeof(*conn), GFP_KERNEL);716 if (!conn)717 return -ENOMEM;718 adap->conn = conn;719 720 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);721 if (!adap->conn_pads)722 return -ENOMEM;723 724 conn->flags = MEDIA_ENT_FL_CONNECTOR;725 conn->function = MEDIA_ENT_F_CONN_RF;726 conn->name = connector_name;727 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;728 729 ret = media_entity_pads_init(conn, 1, adap->conn_pads);730 if (ret)731 return ret;732 733 ret = media_device_register_entity(mdev, conn);734 if (ret)735 return ret;736 737 if (!ntuner) {738 ret = media_create_pad_links(mdev,739 MEDIA_ENT_F_CONN_RF,740 conn, 0,741 MEDIA_ENT_F_DTV_DEMOD,742 demod, 0,743 MEDIA_LNK_FL_ENABLED,744 false);745 } else {746 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK,747 PAD_SIGNAL_ANALOG);748 if (pad_sink < 0)749 return -EINVAL;750 ret = media_create_pad_links(mdev,751 MEDIA_ENT_F_CONN_RF,752 conn, 0,753 MEDIA_ENT_F_TUNER,754 tuner, pad_sink,755 MEDIA_LNK_FL_ENABLED,756 false);757 }758 if (ret)759 return ret;760 }761 762 if (ntuner && ndemod) {763 /* NOTE: first found tuner source pad presumed correct */764 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE,765 PAD_SIGNAL_ANALOG);766 if (pad_source < 0)767 return -EINVAL;768 ret = media_create_pad_links(mdev,769 MEDIA_ENT_F_TUNER,770 tuner, pad_source,771 MEDIA_ENT_F_DTV_DEMOD,772 demod, 0, MEDIA_LNK_FL_ENABLED,773 false);774 if (ret)775 return ret;776 }777 778 if (ndemod && demux) {779 ret = media_create_pad_links(mdev,780 MEDIA_ENT_F_DTV_DEMOD,781 demod, 1,782 MEDIA_ENT_F_TS_DEMUX,783 demux, 0, MEDIA_LNK_FL_ENABLED,784 false);785 if (ret)786 return ret;787 }788 if (demux && ca) {789 ret = media_create_pad_link(demux, 1, ca,790 0, MEDIA_LNK_FL_ENABLED);791 if (ret)792 return ret;793 }794 795 /* Create demux links for each ringbuffer/pad */796 if (demux) {797 media_device_for_each_entity(entity, mdev) {798 if (entity->function == MEDIA_ENT_F_IO_DTV) {799 if (!strncmp(entity->name, DVR_TSOUT,800 strlen(DVR_TSOUT))) {801 ret = media_create_pad_link(demux,802 ++dvr_pad,803 entity, 0, 0);804 if (ret)805 return ret;806 }807 if (!strncmp(entity->name, DEMUX_TSOUT,808 strlen(DEMUX_TSOUT))) {809 ret = media_create_pad_link(demux,810 ++demux_pad,811 entity, 0, 0);812 if (ret)813 return ret;814 }815 }816 }817 }818 819 /* Create interface links for FE->tuner, DVR->demux and CA->ca */820 media_device_for_each_intf(intf, mdev) {821 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {822 link = media_create_intf_link(ca, intf,823 MEDIA_LNK_FL_ENABLED |824 MEDIA_LNK_FL_IMMUTABLE);825 if (!link)826 return -ENOMEM;827 }828 829 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {830 link = media_create_intf_link(tuner, intf,831 MEDIA_LNK_FL_ENABLED |832 MEDIA_LNK_FL_IMMUTABLE);833 if (!link)834 return -ENOMEM;835 }836#if 0837 /*838 * Indirect link - let's not create yet, as we don't know how839 * to handle indirect links, nor if this will840 * actually be needed.841 */842 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {843 link = media_create_intf_link(demux, intf,844 MEDIA_LNK_FL_ENABLED |845 MEDIA_LNK_FL_IMMUTABLE);846 if (!link)847 return -ENOMEM;848 }849#endif850 if (intf->type == MEDIA_INTF_T_DVB_DVR) {851 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);852 if (ret)853 return ret;854 }855 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {856 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);857 if (ret)858 return ret;859 }860 }861 return 0;862}863EXPORT_SYMBOL_GPL(dvb_create_media_graph);864#endif865 866static int dvbdev_check_free_adapter_num(int num)867{868 struct list_head *entry;869 870 list_for_each(entry, &dvb_adapter_list) {871 struct dvb_adapter *adap;872 873 adap = list_entry(entry, struct dvb_adapter, list_head);874 if (adap->num == num)875 return 0;876 }877 return 1;878}879 880static int dvbdev_get_free_adapter_num(void)881{882 int num = 0;883 884 while (num < DVB_MAX_ADAPTERS) {885 if (dvbdev_check_free_adapter_num(num))886 return num;887 num++;888 }889 890 return -ENFILE;891}892 893int dvb_register_adapter(struct dvb_adapter *adap, const char *name,894 struct module *module, struct device *device,895 short *adapter_nums)896{897 int i, num;898 899 mutex_lock(&dvbdev_register_lock);900 901 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {902 num = adapter_nums[i];903 if (num >= 0 && num < DVB_MAX_ADAPTERS) {904 /* use the one the driver asked for */905 if (dvbdev_check_free_adapter_num(num))906 break;907 } else {908 num = dvbdev_get_free_adapter_num();909 break;910 }911 num = -1;912 }913 914 if (num < 0) {915 mutex_unlock(&dvbdev_register_lock);916 return -ENFILE;917 }918 919 memset(adap, 0, sizeof(struct dvb_adapter));920 INIT_LIST_HEAD(&adap->device_list);921 922 pr_info("DVB: registering new adapter (%s)\n", name);923 924 adap->num = num;925 adap->name = name;926 adap->module = module;927 adap->device = device;928 adap->mfe_shared = 0;929 adap->mfe_dvbdev = NULL;930 mutex_init(&adap->mfe_lock);931 932#ifdef CONFIG_MEDIA_CONTROLLER_DVB933 mutex_init(&adap->mdev_lock);934#endif935 936 list_add_tail(&adap->list_head, &dvb_adapter_list);937 938 mutex_unlock(&dvbdev_register_lock);939 940 return num;941}942EXPORT_SYMBOL(dvb_register_adapter);943 944int dvb_unregister_adapter(struct dvb_adapter *adap)945{946 mutex_lock(&dvbdev_register_lock);947 list_del(&adap->list_head);948 mutex_unlock(&dvbdev_register_lock);949 return 0;950}951EXPORT_SYMBOL(dvb_unregister_adapter);952 953/*954 * if the miracle happens and "generic_usercopy()" is included into955 * the kernel, then this can vanish. please don't make the mistake and956 * define this as video_usercopy(). this will introduce a dependency957 * to the v4l "videodev.o" module, which is unnecessary for some958 * cards (ie. the budget dvb-cards don't need the v4l module...)959 */960int dvb_usercopy(struct file *file,961 unsigned int cmd, unsigned long arg,962 int (*func)(struct file *file,963 unsigned int cmd, void *arg))964{965 char sbuf[128] = {};966 void *mbuf = NULL;967 void *parg = NULL;968 int err = -EINVAL;969 970 /* Copy arguments into temp kernel buffer */971 switch (_IOC_DIR(cmd)) {972 case _IOC_NONE:973 /*974 * For this command, the pointer is actually an integer975 * argument.976 */977 parg = (void *)arg;978 break;979 case _IOC_READ: /* some v4l ioctls are marked wrong ... */980 case _IOC_WRITE:981 case (_IOC_WRITE | _IOC_READ):982 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {983 parg = sbuf;984 } else {985 /* too big to allocate from stack */986 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);987 if (!mbuf)988 return -ENOMEM;989 parg = mbuf;990 }991 992 err = -EFAULT;993 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))994 goto out;995 break;996 }997 998 /* call driver */999 err = func(file, cmd, parg);1000 if (err == -ENOIOCTLCMD)1001 err = -ENOTTY;1002 1003 if (err < 0)1004 goto out;1005 1006 /* Copy results into user buffer */1007 switch (_IOC_DIR(cmd)) {1008 case _IOC_READ:1009 case (_IOC_WRITE | _IOC_READ):1010 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))1011 err = -EFAULT;1012 break;1013 }1014 1015out:1016 kfree(mbuf);1017 return err;1018}1019 1020#if IS_ENABLED(CONFIG_I2C)1021struct i2c_client *dvb_module_probe(const char *module_name,1022 const char *name,1023 struct i2c_adapter *adap,1024 unsigned char addr,1025 void *platform_data)1026{1027 struct i2c_client *client;1028 struct i2c_board_info *board_info;1029 1030 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);1031 if (!board_info)1032 return NULL;1033 1034 if (name)1035 strscpy(board_info->type, name, I2C_NAME_SIZE);1036 else1037 strscpy(board_info->type, module_name, I2C_NAME_SIZE);1038 1039 board_info->addr = addr;1040 board_info->platform_data = platform_data;1041 request_module(module_name);1042 client = i2c_new_client_device(adap, board_info);1043 if (!i2c_client_has_driver(client)) {1044 kfree(board_info);1045 return NULL;1046 }1047 1048 if (!try_module_get(client->dev.driver->owner)) {1049 i2c_unregister_device(client);1050 client = NULL;1051 }1052 1053 kfree(board_info);1054 return client;1055}1056EXPORT_SYMBOL_GPL(dvb_module_probe);1057 1058void dvb_module_release(struct i2c_client *client)1059{1060 if (!client)1061 return;1062 1063 module_put(client->dev.driver->owner);1064 i2c_unregister_device(client);1065}1066EXPORT_SYMBOL_GPL(dvb_module_release);1067#endif1068 1069static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)1070{1071 const struct dvb_device *dvbdev = dev_get_drvdata(dev);1072 1073 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);1074 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);1075 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);1076 return 0;1077}1078 1079static char *dvb_devnode(const struct device *dev, umode_t *mode)1080{1081 const struct dvb_device *dvbdev = dev_get_drvdata(dev);1082 1083 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",1084 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);1085}1086 1087static int __init init_dvbdev(void)1088{1089 int retval;1090 dev_t dev = MKDEV(DVB_MAJOR, 0);1091 1092 retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB");1093 if (retval != 0) {1094 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);1095 return retval;1096 }1097 1098 cdev_init(&dvb_device_cdev, &dvb_device_fops);1099 retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS);1100 if (retval != 0) {1101 pr_err("dvb-core: unable register character device\n");1102 goto error;1103 }1104 1105 dvb_class = class_create("dvb");1106 if (IS_ERR(dvb_class)) {1107 retval = PTR_ERR(dvb_class);1108 goto error;1109 }1110 dvb_class->dev_uevent = dvb_uevent;1111 dvb_class->devnode = dvb_devnode;1112 return 0;1113 1114error:1115 cdev_del(&dvb_device_cdev);1116 unregister_chrdev_region(dev, MAX_DVB_MINORS);1117 return retval;1118}1119 1120static void __exit exit_dvbdev(void)1121{1122 struct dvbdevfops_node *node, *next;1123 1124 class_destroy(dvb_class);1125 cdev_del(&dvb_device_cdev);1126 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);1127 1128 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) {1129 list_del(&node->list_head);1130 kfree(node->fops);1131 kfree(node);1132 }1133}1134 1135subsys_initcall(init_dvbdev);1136module_exit(exit_dvbdev);1137 1138MODULE_DESCRIPTION("DVB Core Driver");1139MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");1140MODULE_LICENSE("GPL");1141