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 = 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) {
166 EXPORT_SYMBOL(dvb_generic_release);
169 long dvb_generic_ioctl(struct file *file,
170 unsigned int cmd, unsigned long arg)
172 struct dvb_device *dvbdev = file->private_data;
177 if (!dvbdev->kernel_ioctl)
180 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
182 EXPORT_SYMBOL(dvb_generic_ioctl);
185 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
189 while (id < DVB_MAX_IDS) {
190 struct dvb_device *dev;
191 list_for_each_entry(dev, &adap->device_list, list_head)
192 if (dev->type == type && dev->id == id)
201 static void dvb_media_device_free(struct dvb_device *dvbdev)
203 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
204 if (dvbdev->entity) {
205 media_device_unregister_entity(dvbdev->entity);
206 kfree(dvbdev->entity);
208 dvbdev->entity = NULL;
212 if (dvbdev->tsout_entity) {
215 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
216 media_device_unregister_entity(&dvbdev->tsout_entity[i]);
217 kfree(dvbdev->tsout_entity[i].name);
219 kfree(dvbdev->tsout_entity);
220 kfree(dvbdev->tsout_pads);
221 dvbdev->tsout_entity = NULL;
222 dvbdev->tsout_pads = NULL;
224 dvbdev->tsout_num_entities = 0;
227 if (dvbdev->intf_devnode) {
228 media_devnode_remove(dvbdev->intf_devnode);
229 dvbdev->intf_devnode = NULL;
232 if (dvbdev->adapter->conn) {
233 media_device_unregister_entity(dvbdev->adapter->conn);
234 kfree(dvbdev->adapter->conn);
235 dvbdev->adapter->conn = NULL;
236 kfree(dvbdev->adapter->conn_pads);
237 dvbdev->adapter->conn_pads = NULL;
242 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
243 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
244 const char *name, int npads)
248 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
250 if (!dvbdev->tsout_pads)
253 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
255 if (!dvbdev->tsout_entity)
258 dvbdev->tsout_num_entities = npads;
260 for (i = 0; i < npads; i++) {
261 struct media_pad *pads = &dvbdev->tsout_pads[i];
262 struct media_entity *entity = &dvbdev->tsout_entity[i];
264 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
268 entity->function = MEDIA_ENT_F_IO_DTV;
269 pads->flags = MEDIA_PAD_FL_SINK;
271 ret = media_entity_pads_init(entity, 1, pads);
275 ret = media_device_register_entity(dvbdev->adapter->mdev,
283 #define DEMUX_TSOUT "demux-tsout"
284 #define DVR_TSOUT "dvr-tsout"
286 static int dvb_create_media_entity(struct dvb_device *dvbdev,
287 int type, int demux_sink_pads)
292 case DVB_DEVICE_FRONTEND:
296 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
299 case DVB_DEVICE_DEMUX:
300 npads = 1 + demux_sink_pads;
301 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
311 * We should be creating entities for the MPE/ULE
312 * decapsulation hardware (or software implementation).
314 * However, the number of for the MPE/ULE decaps may not be
315 * fixed. As we don't have yet dynamic support for PADs at
316 * the Media Controller, let's not create the decap
324 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
328 dvbdev->entity->name = dvbdev->name;
331 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
334 kfree(dvbdev->entity);
340 case DVB_DEVICE_FRONTEND:
341 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
342 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
343 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
345 case DVB_DEVICE_DEMUX:
346 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
347 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
348 for (i = 1; i < npads; i++)
349 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
352 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
353 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
354 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
357 /* Should never happen, as the first switch prevents it */
358 kfree(dvbdev->entity);
360 dvbdev->entity = NULL;
366 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
370 ret = media_device_register_entity(dvbdev->adapter->mdev,
375 pr_info("%s: media entity '%s' registered.\n",
376 __func__, dvbdev->entity->name);
382 static int dvb_register_media_device(struct dvb_device *dvbdev,
384 unsigned demux_sink_pads)
386 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
387 struct media_link *link;
391 if (!dvbdev->adapter->mdev)
394 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
399 case DVB_DEVICE_FRONTEND:
400 intf_type = MEDIA_INTF_T_DVB_FE;
402 case DVB_DEVICE_DEMUX:
403 intf_type = MEDIA_INTF_T_DVB_DEMUX;
406 intf_type = MEDIA_INTF_T_DVB_DVR;
409 intf_type = MEDIA_INTF_T_DVB_CA;
412 intf_type = MEDIA_INTF_T_DVB_NET;
418 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
422 if (!dvbdev->intf_devnode)
426 * Create the "obvious" link, e. g. the ones that represent
427 * a direct association between an interface and an entity.
428 * Other links should be created elsewhere, like:
429 * DVB FE intf -> tuner
430 * DVB demux intf -> dvr
436 link = media_create_intf_link(dvbdev->entity,
437 &dvbdev->intf_devnode->intf,
438 MEDIA_LNK_FL_ENABLED |
439 MEDIA_LNK_FL_IMMUTABLE);
446 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
447 const struct dvb_device *template, void *priv,
448 enum dvb_device_type type, int demux_sink_pads)
450 struct dvb_device *dvbdev;
451 struct file_operations *dvbdevfops;
452 struct device *clsdev;
456 mutex_lock(&dvbdev_register_lock);
458 if ((id = dvbdev_get_free_id (adap, type)) < 0){
459 mutex_unlock(&dvbdev_register_lock);
461 pr_err("%s: couldn't find free device id\n", __func__);
465 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
468 mutex_unlock(&dvbdev_register_lock);
472 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
476 mutex_unlock(&dvbdev_register_lock);
480 memcpy(dvbdev, template, sizeof(struct dvb_device));
483 dvbdev->adapter = adap;
485 dvbdev->fops = dvbdevfops;
486 init_waitqueue_head (&dvbdev->wait_queue);
488 dvbdevfops->owner = adap->module;
490 list_add_tail (&dvbdev->list_head, &adap->device_list);
492 down_write(&minor_rwsem);
493 #ifdef CONFIG_DVB_DYNAMIC_MINORS
494 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
495 if (dvb_minors[minor] == NULL)
498 if (minor == MAX_DVB_MINORS) {
499 list_del (&dvbdev->list_head);
502 up_write(&minor_rwsem);
503 mutex_unlock(&dvbdev_register_lock);
507 minor = nums2minor(adap->num, type, id);
510 dvbdev->minor = minor;
511 dvb_minors[minor] = dvbdev;
512 up_write(&minor_rwsem);
514 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
516 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
519 dvb_media_device_free(dvbdev);
520 list_del (&dvbdev->list_head);
523 mutex_unlock(&dvbdev_register_lock);
527 mutex_unlock(&dvbdev_register_lock);
529 clsdev = device_create(dvb_class, adap->device,
530 MKDEV(DVB_MAJOR, minor),
531 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
532 if (IS_ERR(clsdev)) {
533 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
534 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
535 dvb_media_device_free(dvbdev);
536 list_del (&dvbdev->list_head);
539 return PTR_ERR(clsdev);
541 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
542 adap->num, dnames[type], id, minor, minor);
546 EXPORT_SYMBOL(dvb_register_device);
549 void dvb_remove_device(struct dvb_device *dvbdev)
554 down_write(&minor_rwsem);
555 dvb_minors[dvbdev->minor] = NULL;
556 up_write(&minor_rwsem);
558 dvb_media_device_free(dvbdev);
560 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
562 list_del (&dvbdev->list_head);
564 EXPORT_SYMBOL(dvb_remove_device);
567 void dvb_free_device(struct dvb_device *dvbdev)
572 kfree (dvbdev->fops);
575 EXPORT_SYMBOL(dvb_free_device);
578 void dvb_unregister_device(struct dvb_device *dvbdev)
580 dvb_remove_device(dvbdev);
581 dvb_free_device(dvbdev);
583 EXPORT_SYMBOL(dvb_unregister_device);
586 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
588 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
589 struct media_interface *intf,
592 struct media_device *mdev = adap->mdev;
593 struct media_entity *entity;
594 struct media_link *link;
596 media_device_for_each_entity(entity, mdev) {
597 if (entity->function == MEDIA_ENT_F_IO_DTV) {
598 if (strncmp(entity->name, name, strlen(name)))
600 link = media_create_intf_link(entity, intf,
601 MEDIA_LNK_FL_ENABLED |
602 MEDIA_LNK_FL_IMMUTABLE);
610 int dvb_create_media_graph(struct dvb_adapter *adap,
611 bool create_rf_connector)
613 struct media_device *mdev = adap->mdev;
614 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
615 struct media_entity *demux = NULL, *ca = NULL;
616 struct media_link *link;
617 struct media_interface *intf;
618 unsigned demux_pad = 0;
619 unsigned dvr_pad = 0;
620 unsigned ntuner = 0, ndemod = 0;
621 int ret, pad_source, pad_sink;
622 static const char *connector_name = "Television";
627 media_device_for_each_entity(entity, mdev) {
628 switch (entity->function) {
629 case MEDIA_ENT_F_TUNER:
633 case MEDIA_ENT_F_DTV_DEMOD:
637 case MEDIA_ENT_F_TS_DEMUX:
640 case MEDIA_ENT_F_DTV_CA:
647 * Prepare to signalize to media_create_pad_links() that multiple
648 * entities of the same type exists and a 1:n or n:1 links need to be
650 * NOTE: if both tuner and demod have multiple instances, it is up
651 * to the caller driver to create such links.
658 if (create_rf_connector) {
659 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
664 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
665 if (!adap->conn_pads)
668 conn->flags = MEDIA_ENT_FL_CONNECTOR;
669 conn->function = MEDIA_ENT_F_CONN_RF;
670 conn->name = connector_name;
671 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
673 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
677 ret = media_device_register_entity(mdev, conn);
682 ret = media_create_pad_links(mdev,
685 MEDIA_ENT_F_DTV_DEMOD,
687 MEDIA_LNK_FL_ENABLED,
690 pad_sink = media_get_pad_index(tuner, true,
694 ret = media_create_pad_links(mdev,
699 MEDIA_LNK_FL_ENABLED,
706 if (ntuner && ndemod) {
707 /* NOTE: first found tuner source pad presumed correct */
708 pad_source = media_get_pad_index(tuner, false,
712 ret = media_create_pad_links(mdev,
715 MEDIA_ENT_F_DTV_DEMOD,
716 demod, 0, MEDIA_LNK_FL_ENABLED,
722 if (ndemod && demux) {
723 ret = media_create_pad_links(mdev,
724 MEDIA_ENT_F_DTV_DEMOD,
726 MEDIA_ENT_F_TS_DEMUX,
727 demux, 0, MEDIA_LNK_FL_ENABLED,
733 ret = media_create_pad_link(demux, 1, ca,
734 0, MEDIA_LNK_FL_ENABLED);
739 /* Create demux links for each ringbuffer/pad */
741 media_device_for_each_entity(entity, mdev) {
742 if (entity->function == MEDIA_ENT_F_IO_DTV) {
743 if (!strncmp(entity->name, DVR_TSOUT,
744 strlen(DVR_TSOUT))) {
745 ret = media_create_pad_link(demux,
751 if (!strncmp(entity->name, DEMUX_TSOUT,
752 strlen(DEMUX_TSOUT))) {
753 ret = media_create_pad_link(demux,
763 /* Create interface links for FE->tuner, DVR->demux and CA->ca */
764 media_device_for_each_intf(intf, mdev) {
765 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
766 link = media_create_intf_link(ca, intf,
767 MEDIA_LNK_FL_ENABLED |
768 MEDIA_LNK_FL_IMMUTABLE);
773 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
774 link = media_create_intf_link(tuner, intf,
775 MEDIA_LNK_FL_ENABLED |
776 MEDIA_LNK_FL_IMMUTABLE);
782 * Indirect link - let's not create yet, as we don't know how
783 * to handle indirect links, nor if this will
784 * actually be needed.
786 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
787 link = media_create_intf_link(demux, intf,
788 MEDIA_LNK_FL_ENABLED |
789 MEDIA_LNK_FL_IMMUTABLE);
794 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
795 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
799 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
800 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
807 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
810 static int dvbdev_check_free_adapter_num(int num)
812 struct list_head *entry;
813 list_for_each(entry, &dvb_adapter_list) {
814 struct dvb_adapter *adap;
815 adap = list_entry(entry, struct dvb_adapter, list_head);
816 if (adap->num == num)
822 static int dvbdev_get_free_adapter_num (void)
826 while (num < DVB_MAX_ADAPTERS) {
827 if (dvbdev_check_free_adapter_num(num))
836 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
837 struct module *module, struct device *device,
842 mutex_lock(&dvbdev_register_lock);
844 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
845 num = adapter_nums[i];
846 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
847 /* use the one the driver asked for */
848 if (dvbdev_check_free_adapter_num(num))
851 num = dvbdev_get_free_adapter_num();
858 mutex_unlock(&dvbdev_register_lock);
862 memset (adap, 0, sizeof(struct dvb_adapter));
863 INIT_LIST_HEAD (&adap->device_list);
865 pr_info("DVB: registering new adapter (%s)\n", name);
869 adap->module = module;
870 adap->device = device;
871 adap->mfe_shared = 0;
872 adap->mfe_dvbdev = NULL;
873 mutex_init (&adap->mfe_lock);
875 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
876 mutex_init(&adap->mdev_lock);
879 list_add_tail (&adap->list_head, &dvb_adapter_list);
881 mutex_unlock(&dvbdev_register_lock);
885 EXPORT_SYMBOL(dvb_register_adapter);
888 int dvb_unregister_adapter(struct dvb_adapter *adap)
890 mutex_lock(&dvbdev_register_lock);
891 list_del (&adap->list_head);
892 mutex_unlock(&dvbdev_register_lock);
895 EXPORT_SYMBOL(dvb_unregister_adapter);
897 /* if the miracle happens and "generic_usercopy()" is included into
898 the kernel, then this can vanish. please don't make the mistake and
899 define this as video_usercopy(). this will introduce a dependency
900 to the v4l "videodev.o" module, which is unnecessary for some
901 cards (ie. the budget dvb-cards don't need the v4l module...) */
902 int dvb_usercopy(struct file *file,
903 unsigned int cmd, unsigned long arg,
904 int (*func)(struct file *file,
905 unsigned int cmd, void *arg))
912 /* Copy arguments into temp kernel buffer */
913 switch (_IOC_DIR(cmd)) {
916 * For this command, the pointer is actually an integer
921 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
923 case (_IOC_WRITE | _IOC_READ):
924 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
927 /* too big to allocate from stack */
928 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
935 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
941 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
947 /* Copy results into user buffer */
948 switch (_IOC_DIR(cmd))
951 case (_IOC_WRITE | _IOC_READ):
952 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
962 #if IS_ENABLED(CONFIG_I2C)
963 struct i2c_client *dvb_module_probe(const char *module_name,
965 struct i2c_adapter *adap,
969 struct i2c_client *client;
970 struct i2c_board_info *board_info;
972 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
977 strscpy(board_info->type, name, I2C_NAME_SIZE);
979 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
981 board_info->addr = addr;
982 board_info->platform_data = platform_data;
983 request_module(module_name);
984 client = i2c_new_client_device(adap, board_info);
985 if (!i2c_client_has_driver(client)) {
990 if (!try_module_get(client->dev.driver->owner)) {
991 i2c_unregister_device(client);
998 EXPORT_SYMBOL_GPL(dvb_module_probe);
1000 void dvb_module_release(struct i2c_client *client)
1005 module_put(client->dev.driver->owner);
1006 i2c_unregister_device(client);
1008 EXPORT_SYMBOL_GPL(dvb_module_release);
1011 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1013 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1015 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1016 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1017 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1021 static char *dvb_devnode(struct device *dev, umode_t *mode)
1023 struct dvb_device *dvbdev = dev_get_drvdata(dev);
1025 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1026 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1030 static int __init init_dvbdev(void)
1033 dev_t dev = MKDEV(DVB_MAJOR, 0);
1035 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1036 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1040 cdev_init(&dvb_device_cdev, &dvb_device_fops);
1041 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1042 pr_err("dvb-core: unable register character device\n");
1046 dvb_class = class_create(THIS_MODULE, "dvb");
1047 if (IS_ERR(dvb_class)) {
1048 retval = PTR_ERR(dvb_class);
1051 dvb_class->dev_uevent = dvb_uevent;
1052 dvb_class->devnode = dvb_devnode;
1056 cdev_del(&dvb_device_cdev);
1057 unregister_chrdev_region(dev, MAX_DVB_MINORS);
1062 static void __exit exit_dvbdev(void)
1064 class_destroy(dvb_class);
1065 cdev_del(&dvb_device_cdev);
1066 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1069 subsys_initcall(init_dvbdev);
1070 module_exit(exit_dvbdev);
1072 MODULE_DESCRIPTION("DVB Core Driver");
1073 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1074 MODULE_LICENSE("GPL");