1 // SPDX-License-Identifier: LGPL-2.1-or-later
5 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>
6 * & Marcus Metzler <marcus@convergence.de>
7 * for convergence integrated media GmbH
10 #define pr_fmt(fmt) "dvbdev: " fmt
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>
22 #include <linux/cdev.h>
23 #include <linux/mutex.h>
24 #include <media/dvbdev.h>
26 /* Due to enum tuner_pad_index */
27 #include <media/tuner.h>
29 static DEFINE_MUTEX(dvbdev_mutex);
30 static int dvbdev_debug;
32 module_param(dvbdev_debug, int, 0644);
33 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
35 #define dprintk(fmt, arg...) do { \
37 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
41 static LIST_HEAD(dvb_adapter_list);
42 static DEFINE_MUTEX(dvbdev_register_lock);
44 static const char * const dnames[] = {
45 [DVB_DEVICE_VIDEO] = "video",
46 [DVB_DEVICE_AUDIO] = "audio",
47 [DVB_DEVICE_SEC] = "sec",
48 [DVB_DEVICE_FRONTEND] = "frontend",
49 [DVB_DEVICE_DEMUX] = "demux",
50 [DVB_DEVICE_DVR] = "dvr",
51 [DVB_DEVICE_CA] = "ca",
52 [DVB_DEVICE_NET] = "net",
53 [DVB_DEVICE_OSD] = "osd"
56 #ifdef CONFIG_DVB_DYNAMIC_MINORS
57 #define MAX_DVB_MINORS 256
58 #define DVB_MAX_IDS MAX_DVB_MINORS
62 static const u8 minor_type[] = {
63 [DVB_DEVICE_VIDEO] = 0,
64 [DVB_DEVICE_AUDIO] = 1,
66 [DVB_DEVICE_FRONTEND] = 3,
67 [DVB_DEVICE_DEMUX] = 4,
74 #define nums2minor(num, type, id) \
75 (((num) << 6) | ((id) << 4) | minor_type[type])
77 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
80 static struct class *dvb_class;
82 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
83 static DECLARE_RWSEM(minor_rwsem);
85 static int dvb_device_open(struct inode *inode, struct file *file)
87 struct dvb_device *dvbdev;
89 mutex_lock(&dvbdev_mutex);
90 down_read(&minor_rwsem);
91 dvbdev = dvb_minors[iminor(inode)];
93 if (dvbdev && dvbdev->fops) {
95 const struct file_operations *new_fops;
97 new_fops = fops_get(dvbdev->fops);
100 file->private_data = dvb_device_get(dvbdev);
101 replace_fops(file, new_fops);
102 if (file->f_op->open)
103 err = file->f_op->open(inode, file);
104 up_read(&minor_rwsem);
105 mutex_unlock(&dvbdev_mutex);
109 up_read(&minor_rwsem);
110 mutex_unlock(&dvbdev_mutex);
115 static const struct file_operations dvb_device_fops =
117 .owner = THIS_MODULE,
118 .open = dvb_device_open,
119 .llseek = noop_llseek,
122 static struct cdev dvb_device_cdev;
124 int dvb_generic_open(struct inode *inode, struct file *file)
126 struct dvb_device *dvbdev = file->private_data;
134 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
135 if (!dvbdev->readers)
139 if (!dvbdev->writers)
147 EXPORT_SYMBOL(dvb_generic_open);
150 int dvb_generic_release(struct inode *inode, struct file *file)
152 struct dvb_device *dvbdev = file->private_data;
157 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
165 dvb_device_put(dvbdev);
169 EXPORT_SYMBOL(dvb_generic_release);
172 long dvb_generic_ioctl(struct file *file,
173 unsigned int cmd, unsigned long arg)
175 struct dvb_device *dvbdev = file->private_data;
180 if (!dvbdev->kernel_ioctl)
183 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
185 EXPORT_SYMBOL(dvb_generic_ioctl);
188 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
192 while (id < DVB_MAX_IDS) {
193 struct dvb_device *dev;
194 list_for_each_entry(dev, &adap->device_list, list_head)
195 if (dev->type == type && dev->id == id)
204 static void dvb_media_device_free(struct dvb_device *dvbdev)
206 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
207 if (dvbdev->entity) {
208 media_device_unregister_entity(dvbdev->entity);
209 kfree(dvbdev->entity);
211 dvbdev->entity = NULL;
215 if (dvbdev->tsout_entity) {
218 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
219 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
220 kfree(dvbdev->tsout_entity[i].name);
222 kfree(dvbdev->tsout_entity);
223 kfree(dvbdev->tsout_pads);
224 dvbdev->tsout_entity = NULL;
225 dvbdev->tsout_pads = NULL;
227 dvbdev->tsout_num_entities = 0;
230 if (dvbdev->intf_devnode) {
231 media_devnode_remove(dvbdev->intf_devnode);
232 dvbdev->intf_devnode = NULL;
235 if (dvbdev->adapter->conn) {
236 media_device_unregister_entity(dvbdev->adapter->conn);
237 kfree(dvbdev->adapter->conn);
238 dvbdev->adapter->conn = NULL;
239 kfree(dvbdev->adapter->conn_pads);
240 dvbdev->adapter->conn_pads = NULL;
245 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
246 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
247 const char *name, int npads)
251 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
253 if (!dvbdev->tsout_pads)
256 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
258 if (!dvbdev->tsout_entity)
261 dvbdev->tsout_num_entities = npads;
263 for (i = 0; i < npads; i++) {
264 struct media_pad *pads = &dvbdev->tsout_pads[i];
265 struct media_entity *entity = &dvbdev->tsout_entity[i];
268 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
272 entity->function = MEDIA_ENT_F_IO_DTV;
273 pads->flags = MEDIA_PAD_FL_SINK;
275 ret = media_entity_pads_init(entity, 1, pads);
279 ret = media_device_register_entity(dvbdev->adapter->mdev,
287 #define DEMUX_TSOUT "demux-tsout"
288 #define DVR_TSOUT "dvr-tsout"
290 static int dvb_create_media_entity(struct dvb_device *dvbdev,
291 int type, int demux_sink_pads)
296 case DVB_DEVICE_FRONTEND:
300 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
303 case DVB_DEVICE_DEMUX:
304 npads = 1 + demux_sink_pads;
305 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
315 * We should be creating entities for the MPE/ULE
316 * decapsulation hardware (or software implementation).
318 * However, the number of for the MPE/ULE decaps may not be
319 * fixed. As we don't have yet dynamic support for PADs at
320 * the Media Controller, let's not create the decap
328 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
332 dvbdev->entity->name = dvbdev->name;
335 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
338 kfree(dvbdev->entity);
339 dvbdev->entity = NULL;
345 case DVB_DEVICE_FRONTEND:
346 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
347 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
348 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
350 case DVB_DEVICE_DEMUX:
351 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
352 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
353 for (i = 1; i < npads; i++)
354 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
357 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
358 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
359 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
362 /* Should never happen, as the first switch prevents it */
363 kfree(dvbdev->entity);
365 dvbdev->entity = NULL;
371 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
375 ret = media_device_register_entity(dvbdev->adapter->mdev,
380 pr_info("%s: media entity '%s' registered.\n",
381 __func__, dvbdev->entity->name);
387 static int dvb_register_media_device(struct dvb_device *dvbdev,
389 unsigned demux_sink_pads)
391 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
392 struct media_link *link;
396 if (!dvbdev->adapter->mdev)
399 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
404 case DVB_DEVICE_FRONTEND:
405 intf_type = MEDIA_INTF_T_DVB_FE;
407 case DVB_DEVICE_DEMUX:
408 intf_type = MEDIA_INTF_T_DVB_DEMUX;
411 intf_type = MEDIA_INTF_T_DVB_DVR;
414 intf_type = MEDIA_INTF_T_DVB_CA;
417 intf_type = MEDIA_INTF_T_DVB_NET;
423 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
427 if (!dvbdev->intf_devnode)
431 * Create the "obvious" link, e. g. the ones that represent
432 * a direct association between an interface and an entity.
433 * Other links should be created elsewhere, like:
434 * DVB FE intf -> tuner
435 * DVB demux intf -> dvr
441 link = media_create_intf_link(dvbdev->entity,
442 &dvbdev->intf_devnode->intf,
443 MEDIA_LNK_FL_ENABLED |
444 MEDIA_LNK_FL_IMMUTABLE);
451 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
452 const struct dvb_device *template, void *priv,
453 enum dvb_device_type type, int demux_sink_pads)
455 struct dvb_device *dvbdev;
456 struct file_operations *dvbdevfops;
457 struct device *clsdev;
461 mutex_lock(&dvbdev_register_lock);
463 if ((id = dvbdev_get_free_id (adap, type)) < 0){
464 mutex_unlock(&dvbdev_register_lock);
466 pr_err("%s: couldn't find free device id\n", __func__);
470 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
473 mutex_unlock(&dvbdev_register_lock);
477 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
481 mutex_unlock(&dvbdev_register_lock);
485 memcpy(dvbdev, template, sizeof(struct dvb_device));
486 kref_init(&dvbdev->ref);
489 dvbdev->adapter = adap;
491 dvbdev->fops = dvbdevfops;
492 init_waitqueue_head (&dvbdev->wait_queue);
494 dvbdevfops->owner = adap->module;
496 list_add_tail (&dvbdev->list_head, &adap->device_list);
498 down_write(&minor_rwsem);
499 #ifdef CONFIG_DVB_DYNAMIC_MINORS
500 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
501 if (dvb_minors[minor] == NULL)
504 if (minor == MAX_DVB_MINORS) {
505 list_del (&dvbdev->list_head);
508 up_write(&minor_rwsem);
509 mutex_unlock(&dvbdev_register_lock);
513 minor = nums2minor(adap->num, type, id);
516 dvbdev->minor = minor;
517 dvb_minors[minor] = dvb_device_get(dvbdev);
518 up_write(&minor_rwsem);
520 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
522 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
525 dvb_media_device_free(dvbdev);
526 list_del (&dvbdev->list_head);
529 mutex_unlock(&dvbdev_register_lock);
533 mutex_unlock(&dvbdev_register_lock);
535 clsdev = device_create(dvb_class, adap->device,
536 MKDEV(DVB_MAJOR, minor),
537 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
538 if (IS_ERR(clsdev)) {
539 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
540 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
541 dvb_media_device_free(dvbdev);
542 list_del (&dvbdev->list_head);
545 return PTR_ERR(clsdev);
547 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
548 adap->num, dnames[type], id, minor, minor);
552 EXPORT_SYMBOL(dvb_register_device);
555 void dvb_remove_device(struct dvb_device *dvbdev)
560 down_write(&minor_rwsem);
561 dvb_minors[dvbdev->minor] = NULL;
562 dvb_device_put(dvbdev);
563 up_write(&minor_rwsem);
565 dvb_media_device_free(dvbdev);
567 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
569 list_del (&dvbdev->list_head);
571 EXPORT_SYMBOL(dvb_remove_device);
574 static void dvb_free_device(struct kref *ref)
576 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
578 kfree (dvbdev->fops);
583 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
585 kref_get(&dvbdev->ref);
588 EXPORT_SYMBOL(dvb_device_get);
591 void dvb_device_put(struct dvb_device *dvbdev)
594 kref_put(&dvbdev->ref, dvb_free_device);
598 void dvb_unregister_device(struct dvb_device *dvbdev)
600 dvb_remove_device(dvbdev);
601 dvb_device_put(dvbdev);
603 EXPORT_SYMBOL(dvb_unregister_device);
606 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
608 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
609 struct media_interface *intf,
612 struct media_device *mdev = adap->mdev;
613 struct media_entity *entity;
614 struct media_link *link;
616 media_device_for_each_entity(entity, mdev) {
617 if (entity->function == MEDIA_ENT_F_IO_DTV) {
618 if (strncmp(entity->name, name, strlen(name)))
620 link = media_create_intf_link(entity, intf,
621 MEDIA_LNK_FL_ENABLED |
622 MEDIA_LNK_FL_IMMUTABLE);
630 int dvb_create_media_graph(struct dvb_adapter *adap,
631 bool create_rf_connector)
633 struct media_device *mdev = adap->mdev;
634 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
635 struct media_entity *demux = NULL, *ca = NULL;
636 struct media_link *link;
637 struct media_interface *intf;
638 unsigned demux_pad = 0;
639 unsigned dvr_pad = 0;
640 unsigned ntuner = 0, ndemod = 0;
641 int ret, pad_source, pad_sink;
642 static const char *connector_name = "Television";
647 media_device_for_each_entity(entity, mdev) {
648 switch (entity->function) {
649 case MEDIA_ENT_F_TUNER:
653 case MEDIA_ENT_F_DTV_DEMOD:
657 case MEDIA_ENT_F_TS_DEMUX:
660 case MEDIA_ENT_F_DTV_CA:
667 * Prepare to signalize to media_create_pad_links() that multiple
668 * entities of the same type exists and a 1:n or n:1 links need to be
670 * NOTE: if both tuner and demod have multiple instances, it is up
671 * to the caller driver to create such links.
678 if (create_rf_connector) {
679 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
684 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
685 if (!adap->conn_pads)
688 conn->flags = MEDIA_ENT_FL_CONNECTOR;
689 conn->function = MEDIA_ENT_F_CONN_RF;
690 conn->name = connector_name;
691 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
693 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
697 ret = media_device_register_entity(mdev, conn);
702 ret = media_create_pad_links(mdev,
705 MEDIA_ENT_F_DTV_DEMOD,
707 MEDIA_LNK_FL_ENABLED,
710 pad_sink = media_get_pad_index(tuner, true,
714 ret = media_create_pad_links(mdev,
719 MEDIA_LNK_FL_ENABLED,
726 if (ntuner && ndemod) {
727 /* NOTE: first found tuner source pad presumed correct */
728 pad_source = media_get_pad_index(tuner, false,
732 ret = media_create_pad_links(mdev,
735 MEDIA_ENT_F_DTV_DEMOD,
736 demod, 0, MEDIA_LNK_FL_ENABLED,
742 if (ndemod && demux) {
743 ret = media_create_pad_links(mdev,
744 MEDIA_ENT_F_DTV_DEMOD,
746 MEDIA_ENT_F_TS_DEMUX,
747 demux, 0, MEDIA_LNK_FL_ENABLED,
753 ret = media_create_pad_link(demux, 1, ca,
754 0, MEDIA_LNK_FL_ENABLED);
759 /* Create demux links for each ringbuffer/pad */
761 media_device_for_each_entity(entity, mdev) {
762 if (entity->function == MEDIA_ENT_F_IO_DTV) {
763 if (!strncmp(entity->name, DVR_TSOUT,
764 strlen(DVR_TSOUT))) {
765 ret = media_create_pad_link(demux,
771 if (!strncmp(entity->name, DEMUX_TSOUT,
772 strlen(DEMUX_TSOUT))) {
773 ret = media_create_pad_link(demux,
783 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
784 media_device_for_each_intf(intf, mdev) {
785 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
786 link = media_create_intf_link(ca, intf,
787 MEDIA_LNK_FL_ENABLED |
788 MEDIA_LNK_FL_IMMUTABLE);
793 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
794 link = media_create_intf_link(tuner, intf,
795 MEDIA_LNK_FL_ENABLED |
796 MEDIA_LNK_FL_IMMUTABLE);
802 * Indirect link - let's not create yet, as we don't know how
803 * to handle indirect links, nor if this will
804 * actually be needed.
806 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
807 link = media_create_intf_link(demux, intf,
808 MEDIA_LNK_FL_ENABLED |
809 MEDIA_LNK_FL_IMMUTABLE);
814 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
815 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
819 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
820 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
827 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
830 static int dvbdev_check_free_adapter_num(int num)
832 struct list_head *entry;
833 list_for_each(entry, &dvb_adapter_list) {
834 struct dvb_adapter *adap;
835 adap = list_entry(entry, struct dvb_adapter, list_head);
836 if (adap->num == num)
842 static int dvbdev_get_free_adapter_num (void)
846 while (num < DVB_MAX_ADAPTERS) {
847 if (dvbdev_check_free_adapter_num(num))
856 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
857 struct module *module, struct device *device,
862 mutex_lock(&dvbdev_register_lock);
864 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
865 num = adapter_nums[i];
866 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
867 /* use the one the driver asked for */
868 if (dvbdev_check_free_adapter_num(num))
871 num = dvbdev_get_free_adapter_num();
878 mutex_unlock(&dvbdev_register_lock);
882 memset (adap, 0, sizeof(struct dvb_adapter));
883 INIT_LIST_HEAD (&adap->device_list);
885 pr_info("DVB: registering new adapter (%s)\n", name);
889 adap->module = module;
890 adap->device = device;
891 adap->mfe_shared = 0;
892 adap->mfe_dvbdev = NULL;
893 mutex_init (&adap->mfe_lock);
895 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
896 mutex_init(&adap->mdev_lock);
899 list_add_tail (&adap->list_head, &dvb_adapter_list);
901 mutex_unlock(&dvbdev_register_lock);
905 EXPORT_SYMBOL(dvb_register_adapter);
908 int dvb_unregister_adapter(struct dvb_adapter *adap)
910 mutex_lock(&dvbdev_register_lock);
911 list_del (&adap->list_head);
912 mutex_unlock(&dvbdev_register_lock);
915 EXPORT_SYMBOL(dvb_unregister_adapter);
917 /* if the miracle happens and "generic_usercopy()" is included into
918 the kernel, then this can vanish. please don't make the mistake and
919 define this as video_usercopy(). this will introduce a dependency
920 to the v4l "videodev.o" module, which is unnecessary for some
921 cards (ie. the budget dvb-cards don't need the v4l module...) */
922 int dvb_usercopy(struct file *file,
923 unsigned int cmd, unsigned long arg,
924 int (*func)(struct file *file,
925 unsigned int cmd, void *arg))
932 /* Copy arguments into temp kernel buffer */
933 switch (_IOC_DIR(cmd)) {
936 * For this command, the pointer is actually an integer
941 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
943 case (_IOC_WRITE | _IOC_READ):
944 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
947 /* too big to allocate from stack */
948 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
955 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
961 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
967 /* Copy results into user buffer */
968 switch (_IOC_DIR(cmd))
971 case (_IOC_WRITE | _IOC_READ):
972 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
982 #if IS_ENABLED(CONFIG_I2C)
983 struct i2c_client *dvb_module_probe(const char *module_name,
985 struct i2c_adapter *adap,
989 struct i2c_client *client;
990 struct i2c_board_info *board_info;
992 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
997 strscpy(board_info->type, name, I2C_NAME_SIZE);
999 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1001 board_info->addr = addr;
1002 board_info->platform_data = platform_data;
1003 request_module(module_name);
1004 client = i2c_new_client_device(adap, board_info);
1005 if (!i2c_client_has_driver(client)) {
1010 if (!try_module_get(client->dev.driver->owner)) {
1011 i2c_unregister_device(client);
1018 EXPORT_SYMBOL_GPL(dvb_module_probe);
1020 void dvb_module_release(struct i2c_client *client)
1025 module_put(client->dev.driver->owner);
1026 i2c_unregister_device(client);
1028 EXPORT_SYMBOL_GPL(dvb_module_release);
1031 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1033 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1035 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1036 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1037 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1041 static char *dvb_devnode(struct device *dev, umode_t *mode)
1043 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1045 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1046 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1050 static int __init init_dvbdev(void)
1053 dev_t dev = MKDEV(DVB_MAJOR, 0);
1055 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1056 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1060 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1061 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1062 pr_err("dvb-core: unable register character device\n");
1066 dvb_class = class_create(THIS_MODULE, "dvb");
1067 if (IS_ERR(dvb_class)) {
1068 retval = PTR_ERR(dvb_class);
1071 dvb_class->dev_uevent = dvb_uevent;
1072 dvb_class->devnode = dvb_devnode;
1076 cdev_del(&dvb_device_cdev);
1077 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1082 static void __exit exit_dvbdev(void)
1084 class_destroy(dvb_class);
1085 cdev_del(&dvb_device_cdev);
1086 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1089 subsys_initcall(init_dvbdev);
1090 module_exit(exit_dvbdev);
1092 MODULE_DESCRIPTION("DVB Core Driver");
1093 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1094 MODULE_LICENSE("GPL");