diff options
Diffstat (limited to 'drivers/media/dvb-core/dvbdev.c')
| -rw-r--r-- | drivers/media/dvb-core/dvbdev.c | 1137 |
1 files changed, 1137 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c new file mode 100644 index 000000000..d352e0284 --- /dev/null +++ b/drivers/media/dvb-core/dvbdev.c @@ -0,0 +1,1137 @@ +// SPDX-License-Identifier: LGPL-2.1-or-later +/* + * dvbdev.c + * + * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de> + * & Marcus Metzler <marcus@convergence.de> + * for convergence integrated media GmbH + */ + +#define pr_fmt(fmt) "dvbdev: " fmt + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/cdev.h> +#include <linux/mutex.h> +#include <media/dvbdev.h> + +/* Due to enum tuner_pad_index */ +#include <media/tuner.h> + +static DEFINE_MUTEX(dvbdev_mutex); +static LIST_HEAD(dvbdevfops_list); +static int dvbdev_debug; + +module_param(dvbdev_debug, int, 0644); +MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); + +#define dprintk(fmt, arg...) do { \ + if (dvbdev_debug) \ + printk(KERN_DEBUG pr_fmt("%s: " fmt), \ + __func__, ##arg); \ +} while (0) + +static LIST_HEAD(dvb_adapter_list); +static DEFINE_MUTEX(dvbdev_register_lock); + +static const char * const dnames[] = { + [DVB_DEVICE_VIDEO] = "video", + [DVB_DEVICE_AUDIO] = "audio", + [DVB_DEVICE_SEC] = "sec", + [DVB_DEVICE_FRONTEND] = "frontend", + [DVB_DEVICE_DEMUX] = "demux", + [DVB_DEVICE_DVR] = "dvr", + [DVB_DEVICE_CA] = "ca", + [DVB_DEVICE_NET] = "net", + [DVB_DEVICE_OSD] = "osd" +}; + +#ifdef CONFIG_DVB_DYNAMIC_MINORS +#define MAX_DVB_MINORS 256 +#define DVB_MAX_IDS MAX_DVB_MINORS +#else +#define DVB_MAX_IDS 4 + +static const u8 minor_type[] = { + [DVB_DEVICE_VIDEO] = 0, + [DVB_DEVICE_AUDIO] = 1, + [DVB_DEVICE_SEC] = 2, + [DVB_DEVICE_FRONTEND] = 3, + [DVB_DEVICE_DEMUX] = 4, + [DVB_DEVICE_DVR] = 5, + [DVB_DEVICE_CA] = 6, + [DVB_DEVICE_NET] = 7, + [DVB_DEVICE_OSD] = 8, +}; + +#define nums2minor(num, type, id) \ + (((num) << 6) | ((id) << 4) | minor_type[type]) + +#define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64) +#endif + +static struct class *dvb_class; + +static struct dvb_device *dvb_minors[MAX_DVB_MINORS]; +static DECLARE_RWSEM(minor_rwsem); + +static int dvb_device_open(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev; + + mutex_lock(&dvbdev_mutex); + down_read(&minor_rwsem); + dvbdev = dvb_minors[iminor(inode)]; + + if (dvbdev && dvbdev->fops) { + int err = 0; + const struct file_operations *new_fops; + + new_fops = fops_get(dvbdev->fops); + if (!new_fops) + goto fail; + file->private_data = dvb_device_get(dvbdev); + replace_fops(file, new_fops); + if (file->f_op->open) + err = file->f_op->open(inode, file); + up_read(&minor_rwsem); + mutex_unlock(&dvbdev_mutex); + if (err) + dvb_device_put(dvbdev); + return err; + } +fail: + up_read(&minor_rwsem); + mutex_unlock(&dvbdev_mutex); + return -ENODEV; +} + + +static const struct file_operations dvb_device_fops = +{ + .owner = THIS_MODULE, + .open = dvb_device_open, + .llseek = noop_llseek, +}; + +static struct cdev dvb_device_cdev; + +int dvb_generic_open(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev = file->private_data; + + if (!dvbdev) + return -ENODEV; + + if (!dvbdev->users) + return -EBUSY; + + if ((file->f_flags & O_ACCMODE) == O_RDONLY) { + if (!dvbdev->readers) + return -EBUSY; + dvbdev->readers--; + } else { + if (!dvbdev->writers) + return -EBUSY; + dvbdev->writers--; + } + + dvbdev->users--; + return 0; +} +EXPORT_SYMBOL(dvb_generic_open); + + +int dvb_generic_release(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev = file->private_data; + + if (!dvbdev) + return -ENODEV; + + if ((file->f_flags & O_ACCMODE) == O_RDONLY) { + dvbdev->readers++; + } else { + dvbdev->writers++; + } + + dvbdev->users++; + + dvb_device_put(dvbdev); + + return 0; +} +EXPORT_SYMBOL(dvb_generic_release); + + +long dvb_generic_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct dvb_device *dvbdev = file->private_data; + + if (!dvbdev) + return -ENODEV; + + if (!dvbdev->kernel_ioctl) + return -EINVAL; + + return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); +} +EXPORT_SYMBOL(dvb_generic_ioctl); + + +static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) +{ + u32 id = 0; + + while (id < DVB_MAX_IDS) { + struct dvb_device *dev; + list_for_each_entry(dev, &adap->device_list, list_head) + if (dev->type == type && dev->id == id) + goto skip; + return id; +skip: + id++; + } + return -ENFILE; +} + +static void dvb_media_device_free(struct dvb_device *dvbdev) +{ +#if defined(CONFIG_MEDIA_CONTROLLER_DVB) + if (dvbdev->entity) { + media_device_unregister_entity(dvbdev->entity); + kfree(dvbdev->entity); + kfree(dvbdev->pads); + dvbdev->entity = NULL; + dvbdev->pads = NULL; + } + + if (dvbdev->tsout_entity) { + int i; + + for (i = 0; i < dvbdev->tsout_num_entities; i++) { + media_device_unregister_entity(&dvbdev->tsout_entity[i]); + kfree(dvbdev->tsout_entity[i].name); + } + kfree(dvbdev->tsout_entity); + kfree(dvbdev->tsout_pads); + dvbdev->tsout_entity = NULL; + dvbdev->tsout_pads = NULL; + + dvbdev->tsout_num_entities = 0; + } + + if (dvbdev->intf_devnode) { + media_devnode_remove(dvbdev->intf_devnode); + dvbdev->intf_devnode = NULL; + } + + if (dvbdev->adapter->conn) { + media_device_unregister_entity(dvbdev->adapter->conn); + kfree(dvbdev->adapter->conn); + dvbdev->adapter->conn = NULL; + kfree(dvbdev->adapter->conn_pads); + dvbdev->adapter->conn_pads = NULL; + } +#endif +} + +#if defined(CONFIG_MEDIA_CONTROLLER_DVB) +static int dvb_create_tsout_entity(struct dvb_device *dvbdev, + const char *name, int npads) +{ + int i, ret = 0; + + dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads), + GFP_KERNEL); + if (!dvbdev->tsout_pads) + return -ENOMEM; + + dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity), + GFP_KERNEL); + if (!dvbdev->tsout_entity) + return -ENOMEM; + + dvbdev->tsout_num_entities = npads; + + for (i = 0; i < npads; i++) { + struct media_pad *pads = &dvbdev->tsout_pads[i]; + struct media_entity *entity = &dvbdev->tsout_entity[i]; + + entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i); + if (!entity->name) + return -ENOMEM; + + entity->function = MEDIA_ENT_F_IO_DTV; + pads->flags = MEDIA_PAD_FL_SINK; + + ret = media_entity_pads_init(entity, 1, pads); + if (ret < 0) + return ret; + + ret = media_device_register_entity(dvbdev->adapter->mdev, + entity); + if (ret < 0) + return ret; + } + return 0; +} + +#define DEMUX_TSOUT "demux-tsout" +#define DVR_TSOUT "dvr-tsout" + +static int dvb_create_media_entity(struct dvb_device *dvbdev, + int type, int demux_sink_pads) +{ + int i, ret, npads; + + switch (type) { + case DVB_DEVICE_FRONTEND: + npads = 2; + break; + case DVB_DEVICE_DVR: + ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT, + demux_sink_pads); + return ret; + case DVB_DEVICE_DEMUX: + npads = 1 + demux_sink_pads; + ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT, + demux_sink_pads); + if (ret < 0) + return ret; + break; + case DVB_DEVICE_CA: + npads = 2; + break; + case DVB_DEVICE_NET: + /* + * We should be creating entities for the MPE/ULE + * decapsulation hardware (or software implementation). + * + * However, the number of for the MPE/ULE decaps may not be + * fixed. As we don't have yet dynamic support for PADs at + * the Media Controller, let's not create the decap + * entities yet. + */ + return 0; + default: + return 0; + } + + dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL); + if (!dvbdev->entity) + return -ENOMEM; + + dvbdev->entity->name = dvbdev->name; + + if (npads) { + dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads), + GFP_KERNEL); + if (!dvbdev->pads) { + kfree(dvbdev->entity); + dvbdev->entity = NULL; + return -ENOMEM; + } + } + + switch (type) { + case DVB_DEVICE_FRONTEND: + dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; + dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; + dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; + break; + case DVB_DEVICE_DEMUX: + dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; + dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; + for (i = 1; i < npads; i++) + dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; + break; + case DVB_DEVICE_CA: + dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; + dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; + dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; + break; + default: + /* Should never happen, as the first switch prevents it */ + kfree(dvbdev->entity); + kfree(dvbdev->pads); + dvbdev->entity = NULL; + dvbdev->pads = NULL; + return 0; + } + + if (npads) { + ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); + if (ret) + return ret; + } + ret = media_device_register_entity(dvbdev->adapter->mdev, + dvbdev->entity); + if (ret) + return ret; + + pr_info("%s: media entity '%s' registered.\n", + __func__, dvbdev->entity->name); + + return 0; +} +#endif + +static int dvb_register_media_device(struct dvb_device *dvbdev, + int type, int minor, + unsigned demux_sink_pads) +{ +#if defined(CONFIG_MEDIA_CONTROLLER_DVB) + struct media_link *link; + u32 intf_type; + int ret; + + if (!dvbdev->adapter->mdev) + return 0; + + ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); + if (ret) + return ret; + + switch (type) { + case DVB_DEVICE_FRONTEND: + intf_type = MEDIA_INTF_T_DVB_FE; + break; + case DVB_DEVICE_DEMUX: + intf_type = MEDIA_INTF_T_DVB_DEMUX; + break; + case DVB_DEVICE_DVR: + intf_type = MEDIA_INTF_T_DVB_DVR; + break; + case DVB_DEVICE_CA: + intf_type = MEDIA_INTF_T_DVB_CA; + break; + case DVB_DEVICE_NET: + intf_type = MEDIA_INTF_T_DVB_NET; + break; + default: + return 0; + } + + dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, + intf_type, 0, + DVB_MAJOR, minor); + + if (!dvbdev->intf_devnode) + return -ENOMEM; + + /* + * Create the "obvious" link, e. g. the ones that represent + * a direct association between an interface and an entity. + * Other links should be created elsewhere, like: + * DVB FE intf -> tuner + * DVB demux intf -> dvr + */ + + if (!dvbdev->entity) + return 0; + + link = media_create_intf_link(dvbdev->entity, + &dvbdev->intf_devnode->intf, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); + if (!link) + return -ENOMEM; +#endif + return 0; +} + +int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, + const struct dvb_device *template, void *priv, + enum dvb_device_type type, int demux_sink_pads) +{ + struct dvb_device *dvbdev; + struct file_operations *dvbdevfops = NULL; + struct dvbdevfops_node *node = NULL, *new_node = NULL; + struct device *clsdev; + int minor; + int id, ret; + + mutex_lock(&dvbdev_register_lock); + + if ((id = dvbdev_get_free_id (adap, type)) < 0) { + mutex_unlock(&dvbdev_register_lock); + *pdvbdev = NULL; + pr_err("%s: couldn't find free device id\n", __func__); + return -ENFILE; + } + + *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL); + if (!dvbdev){ + mutex_unlock(&dvbdev_register_lock); + return -ENOMEM; + } + + /* + * When a device of the same type is probe()d more than once, + * the first allocated fops are used. This prevents memory leaks + * that can occur when the same device is probe()d repeatedly. + */ + list_for_each_entry(node, &dvbdevfops_list, list_head) { + if (node->fops->owner == adap->module && + node->type == type && + node->template == template) { + dvbdevfops = node->fops; + break; + } + } + + if (dvbdevfops == NULL) { + dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL); + if (!dvbdevfops) { + kfree(dvbdev); + mutex_unlock(&dvbdev_register_lock); + return -ENOMEM; + } + + new_node = kzalloc(sizeof(struct dvbdevfops_node), GFP_KERNEL); + if (!new_node) { + kfree(dvbdevfops); + kfree(dvbdev); + mutex_unlock(&dvbdev_register_lock); + return -ENOMEM; + } + + new_node->fops = dvbdevfops; + new_node->type = type; + new_node->template = template; + list_add_tail (&new_node->list_head, &dvbdevfops_list); + } + + memcpy(dvbdev, template, sizeof(struct dvb_device)); + kref_init(&dvbdev->ref); + dvbdev->type = type; + dvbdev->id = id; + dvbdev->adapter = adap; + dvbdev->priv = priv; + dvbdev->fops = dvbdevfops; + init_waitqueue_head (&dvbdev->wait_queue); + dvbdevfops->owner = adap->module; + list_add_tail (&dvbdev->list_head, &adap->device_list); + down_write(&minor_rwsem); +#ifdef CONFIG_DVB_DYNAMIC_MINORS + for (minor = 0; minor < MAX_DVB_MINORS; minor++) + if (dvb_minors[minor] == NULL) + break; + if (minor == MAX_DVB_MINORS) { + if (new_node) { + list_del (&new_node->list_head); + kfree(dvbdevfops); + kfree(new_node); + } + list_del (&dvbdev->list_head); + kfree(dvbdev); + up_write(&minor_rwsem); + mutex_unlock(&dvbdev_register_lock); + return -EINVAL; + } +#else + minor = nums2minor(adap->num, type, id); +#endif + dvbdev->minor = minor; + dvb_minors[minor] = dvb_device_get(dvbdev); + up_write(&minor_rwsem); + ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); + if (ret) { + pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", + __func__); + if (new_node) { + list_del (&new_node->list_head); + kfree(dvbdevfops); + kfree(new_node); + } + dvb_media_device_free(dvbdev); + list_del (&dvbdev->list_head); + kfree(dvbdev); + mutex_unlock(&dvbdev_register_lock); + return ret; + } + + clsdev = device_create(dvb_class, adap->device, + MKDEV(DVB_MAJOR, minor), + dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); + if (IS_ERR(clsdev)) { + pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n", + __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); + if (new_node) { + list_del (&new_node->list_head); + kfree(dvbdevfops); + kfree(new_node); + } + dvb_media_device_free(dvbdev); + list_del (&dvbdev->list_head); + kfree(dvbdev); + mutex_unlock(&dvbdev_register_lock); + return PTR_ERR(clsdev); + } + + dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", + adap->num, dnames[type], id, minor, minor); + + mutex_unlock(&dvbdev_register_lock); + return 0; +} +EXPORT_SYMBOL(dvb_register_device); + + +void dvb_remove_device(struct dvb_device *dvbdev) +{ + if (!dvbdev) + return; + + down_write(&minor_rwsem); + dvb_minors[dvbdev->minor] = NULL; + dvb_device_put(dvbdev); + up_write(&minor_rwsem); + + dvb_media_device_free(dvbdev); + + device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); + + list_del (&dvbdev->list_head); +} +EXPORT_SYMBOL(dvb_remove_device); + + +static void dvb_free_device(struct kref *ref) +{ + struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref); + + kfree (dvbdev); +} + + +struct dvb_device *dvb_device_get(struct dvb_device *dvbdev) +{ + kref_get(&dvbdev->ref); + return dvbdev; +} +EXPORT_SYMBOL(dvb_device_get); + + +void dvb_device_put(struct dvb_device *dvbdev) +{ + if (dvbdev) + kref_put(&dvbdev->ref, dvb_free_device); +} + + +void dvb_unregister_device(struct dvb_device *dvbdev) +{ + dvb_remove_device(dvbdev); + dvb_device_put(dvbdev); +} +EXPORT_SYMBOL(dvb_unregister_device); + + +#ifdef CONFIG_MEDIA_CONTROLLER_DVB + +static int dvb_create_io_intf_links(struct dvb_adapter *adap, + struct media_interface *intf, + char *name) +{ + struct media_device *mdev = adap->mdev; + struct media_entity *entity; + struct media_link *link; + + media_device_for_each_entity(entity, mdev) { + if (entity->function == MEDIA_ENT_F_IO_DTV) { + if (strncmp(entity->name, name, strlen(name))) + continue; + link = media_create_intf_link(entity, intf, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); + if (!link) + return -ENOMEM; + } + } + return 0; +} + +int dvb_create_media_graph(struct dvb_adapter *adap, + bool create_rf_connector) +{ + struct media_device *mdev = adap->mdev; + struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; + struct media_entity *demux = NULL, *ca = NULL; + struct media_link *link; + struct media_interface *intf; + unsigned demux_pad = 0; + unsigned dvr_pad = 0; + unsigned ntuner = 0, ndemod = 0; + int ret, pad_source, pad_sink; + static const char *connector_name = "Television"; + + if (!mdev) + return 0; + + media_device_for_each_entity(entity, mdev) { + switch (entity->function) { + case MEDIA_ENT_F_TUNER: + tuner = entity; + ntuner++; + break; + case MEDIA_ENT_F_DTV_DEMOD: + demod = entity; + ndemod++; + break; + case MEDIA_ENT_F_TS_DEMUX: + demux = entity; + break; + case MEDIA_ENT_F_DTV_CA: + ca = entity; + break; + } + } + + /* + * Prepare to signalize to media_create_pad_links() that multiple + * entities of the same type exists and a 1:n or n:1 links need to be + * created. + * NOTE: if both tuner and demod have multiple instances, it is up + * to the caller driver to create such links. + */ + if (ntuner > 1) + tuner = NULL; + if (ndemod > 1) + demod = NULL; + + if (create_rf_connector) { + conn = kzalloc(sizeof(*conn), GFP_KERNEL); + if (!conn) + return -ENOMEM; + adap->conn = conn; + + adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); + if (!adap->conn_pads) + return -ENOMEM; + + conn->flags = MEDIA_ENT_FL_CONNECTOR; + conn->function = MEDIA_ENT_F_CONN_RF; + conn->name = connector_name; + adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; + + ret = media_entity_pads_init(conn, 1, adap->conn_pads); + if (ret) + return ret; + + ret = media_device_register_entity(mdev, conn); + if (ret) + return ret; + + if (!ntuner) { + ret = media_create_pad_links(mdev, + MEDIA_ENT_F_CONN_RF, + conn, 0, + MEDIA_ENT_F_DTV_DEMOD, + demod, 0, + MEDIA_LNK_FL_ENABLED, + false); + } else { + pad_sink = media_get_pad_index(tuner, true, + PAD_SIGNAL_ANALOG); + if (pad_sink < 0) + return -EINVAL; + ret = media_create_pad_links(mdev, + MEDIA_ENT_F_CONN_RF, + conn, 0, + MEDIA_ENT_F_TUNER, + tuner, pad_sink, + MEDIA_LNK_FL_ENABLED, + false); + } + if (ret) + return ret; + } + + if (ntuner && ndemod) { + /* NOTE: first found tuner source pad presumed correct */ + pad_source = media_get_pad_index(tuner, false, + PAD_SIGNAL_ANALOG); + if (pad_source < 0) + return -EINVAL; + ret = media_create_pad_links(mdev, + MEDIA_ENT_F_TUNER, + tuner, pad_source, + MEDIA_ENT_F_DTV_DEMOD, + demod, 0, MEDIA_LNK_FL_ENABLED, + false); + if (ret) + return ret; + } + + if (ndemod && demux) { + ret = media_create_pad_links(mdev, + MEDIA_ENT_F_DTV_DEMOD, + demod, 1, + MEDIA_ENT_F_TS_DEMUX, + demux, 0, MEDIA_LNK_FL_ENABLED, + false); + if (ret) + return ret; + } + if (demux && ca) { + ret = media_create_pad_link(demux, 1, ca, + 0, MEDIA_LNK_FL_ENABLED); + if (ret) + return ret; + } + + /* Create demux links for each ringbuffer/pad */ + if (demux) { + media_device_for_each_entity(entity, mdev) { + if (entity->function == MEDIA_ENT_F_IO_DTV) { + if (!strncmp(entity->name, DVR_TSOUT, + strlen(DVR_TSOUT))) { + ret = media_create_pad_link(demux, + ++dvr_pad, + entity, 0, 0); + if (ret) + return ret; + } + if (!strncmp(entity->name, DEMUX_TSOUT, + strlen(DEMUX_TSOUT))) { + ret = media_create_pad_link(demux, + ++demux_pad, + entity, 0, 0); + if (ret) + return ret; + } + } + } + } + + /* Create interface links for FE->tuner, DVR->demux and CA->ca */ + media_device_for_each_intf(intf, mdev) { + if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { + link = media_create_intf_link(ca, intf, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); + if (!link) + return -ENOMEM; + } + + if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { + link = media_create_intf_link(tuner, intf, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); + if (!link) + return -ENOMEM; + } +#if 0 + /* + * Indirect link - let's not create yet, as we don't know how + * to handle indirect links, nor if this will + * actually be needed. + */ + if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { + link = media_create_intf_link(demux, intf, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); + if (!link) + return -ENOMEM; + } +#endif + if (intf->type == MEDIA_INTF_T_DVB_DVR) { + ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); + if (ret) + return ret; + } + if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { + ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); + if (ret) + return ret; + } + } + return 0; +} +EXPORT_SYMBOL_GPL(dvb_create_media_graph); +#endif + +static int dvbdev_check_free_adapter_num(int num) +{ + struct list_head *entry; + list_for_each(entry, &dvb_adapter_list) { + struct dvb_adapter *adap; + adap = list_entry(entry, struct dvb_adapter, list_head); + if (adap->num == num) + return 0; + } + return 1; +} + +static int dvbdev_get_free_adapter_num (void) +{ + int num = 0; + + while (num < DVB_MAX_ADAPTERS) { + if (dvbdev_check_free_adapter_num(num)) + return num; + num++; + } + + return -ENFILE; +} + + +int dvb_register_adapter(struct dvb_adapter *adap, const char *name, + struct module *module, struct device *device, + short *adapter_nums) +{ + int i, num; + + mutex_lock(&dvbdev_register_lock); + + for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { + num = adapter_nums[i]; + if (num >= 0 && num < DVB_MAX_ADAPTERS) { + /* use the one the driver asked for */ + if (dvbdev_check_free_adapter_num(num)) + break; + } else { + num = dvbdev_get_free_adapter_num(); + break; + } + num = -1; + } + + if (num < 0) { + mutex_unlock(&dvbdev_register_lock); + return -ENFILE; + } + + memset (adap, 0, sizeof(struct dvb_adapter)); + INIT_LIST_HEAD (&adap->device_list); + + pr_info("DVB: registering new adapter (%s)\n", name); + + adap->num = num; + adap->name = name; + adap->module = module; + adap->device = device; + adap->mfe_shared = 0; + adap->mfe_dvbdev = NULL; + mutex_init (&adap->mfe_lock); + +#ifdef CONFIG_MEDIA_CONTROLLER_DVB + mutex_init(&adap->mdev_lock); +#endif + + list_add_tail (&adap->list_head, &dvb_adapter_list); + + mutex_unlock(&dvbdev_register_lock); + + return num; +} +EXPORT_SYMBOL(dvb_register_adapter); + + +int dvb_unregister_adapter(struct dvb_adapter *adap) +{ + mutex_lock(&dvbdev_register_lock); + list_del (&adap->list_head); + mutex_unlock(&dvbdev_register_lock); + return 0; +} +EXPORT_SYMBOL(dvb_unregister_adapter); + +/* if the miracle happens and "generic_usercopy()" is included into + the kernel, then this can vanish. please don't make the mistake and + define this as video_usercopy(). this will introduce a dependency + to the v4l "videodev.o" module, which is unnecessary for some + cards (ie. the budget dvb-cards don't need the v4l module...) */ +int dvb_usercopy(struct file *file, + unsigned int cmd, unsigned long arg, + int (*func)(struct file *file, + unsigned int cmd, void *arg)) +{ + char sbuf[128]; + void *mbuf = NULL; + void *parg = NULL; + int err = -EINVAL; + + /* Copy arguments into temp kernel buffer */ + switch (_IOC_DIR(cmd)) { + case _IOC_NONE: + /* + * For this command, the pointer is actually an integer + * argument. + */ + parg = (void *) arg; + break; + case _IOC_READ: /* some v4l ioctls are marked wrong ... */ + case _IOC_WRITE: + case (_IOC_WRITE | _IOC_READ): + if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { + parg = sbuf; + } else { + /* too big to allocate from stack */ + mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); + if (NULL == mbuf) + return -ENOMEM; + parg = mbuf; + } + + err = -EFAULT; + if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) + goto out; + break; + } + + /* call driver */ + if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) + err = -ENOTTY; + + if (err < 0) + goto out; + + /* Copy results into user buffer */ + switch (_IOC_DIR(cmd)) + { + case _IOC_READ: + case (_IOC_WRITE | _IOC_READ): + if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) + err = -EFAULT; + break; + } + +out: + kfree(mbuf); + return err; +} + +#if IS_ENABLED(CONFIG_I2C) +struct i2c_client *dvb_module_probe(const char *module_name, + const char *name, + struct i2c_adapter *adap, + unsigned char addr, + void *platform_data) +{ + struct i2c_client *client; + struct i2c_board_info *board_info; + + board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); + if (!board_info) + return NULL; + + if (name) + strscpy(board_info->type, name, I2C_NAME_SIZE); + else + strscpy(board_info->type, module_name, I2C_NAME_SIZE); + + board_info->addr = addr; + board_info->platform_data = platform_data; + request_module(module_name); + client = i2c_new_client_device(adap, board_info); + if (!i2c_client_has_driver(client)) { + kfree(board_info); + return NULL; + } + + if (!try_module_get(client->dev.driver->owner)) { + i2c_unregister_device(client); + client = NULL; + } + + kfree(board_info); + return client; +} +EXPORT_SYMBOL_GPL(dvb_module_probe); + +void dvb_module_release(struct i2c_client *client) +{ + if (!client) + return; + + module_put(client->dev.driver->owner); + i2c_unregister_device(client); +} +EXPORT_SYMBOL_GPL(dvb_module_release); +#endif + +static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct dvb_device *dvbdev = dev_get_drvdata(dev); + + add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); + add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); + add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); + return 0; +} + +static char *dvb_devnode(struct device *dev, umode_t *mode) +{ + struct dvb_device *dvbdev = dev_get_drvdata(dev); + + return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", + dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); +} + + +static int __init init_dvbdev(void) +{ + int retval; + dev_t dev = MKDEV(DVB_MAJOR, 0); + + if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { + pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); + return retval; + } + + cdev_init(&dvb_device_cdev, &dvb_device_fops); + if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { + pr_err("dvb-core: unable register character device\n"); + goto error; + } + + dvb_class = class_create(THIS_MODULE, "dvb"); + if (IS_ERR(dvb_class)) { + retval = PTR_ERR(dvb_class); + goto error; + } + dvb_class->dev_uevent = dvb_uevent; + dvb_class->devnode = dvb_devnode; + return 0; + +error: + cdev_del(&dvb_device_cdev); + unregister_chrdev_region(dev, MAX_DVB_MINORS); + return retval; +} + + +static void __exit exit_dvbdev(void) +{ + struct dvbdevfops_node *node, *next; + + class_destroy(dvb_class); + cdev_del(&dvb_device_cdev); + unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); + + list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) { + list_del (&node->list_head); + kfree(node->fops); + kfree(node); + } +} + +subsys_initcall(init_dvbdev); +module_exit(exit_dvbdev); + +MODULE_DESCRIPTION("DVB Core Driver"); +MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); +MODULE_LICENSE("GPL"); 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