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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