diff options
Diffstat (limited to 'drivers/media/dvb-core/dvbdev.c')
| -rw-r--r-- | drivers/media/dvb-core/dvbdev.c | 507 |
1 files changed, 507 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c new file mode 100644 index 000000000000..39eab73b01ae --- /dev/null +++ b/drivers/media/dvb-core/dvbdev.c @@ -0,0 +1,507 @@ +/* + * dvbdev.c + * + * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de> + * & Marcus Metzler <marcus@convergence.de> + * for convergence integrated media GmbH + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/module.h> +#include <linux/kernel.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 "dvbdev.h" + +static DEFINE_MUTEX(dvbdev_mutex); +static int dvbdev_debug; + +module_param(dvbdev_debug, int, 0644); +MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); + +#define dprintk if (dvbdev_debug) printk + +static LIST_HEAD(dvb_adapter_list); +static DEFINE_MUTEX(dvbdev_register_lock); + +static const char * const dnames[] = { + "video", "audio", "sec", "frontend", "demux", "dvr", "ca", + "net", "osd" +}; + +#ifdef CONFIG_DVB_DYNAMIC_MINORS +#define MAX_DVB_MINORS 256 +#define DVB_MAX_IDS MAX_DVB_MINORS +#else +#define DVB_MAX_IDS 4 +#define nums2minor(num,type,id) ((num << 6) | (id << 4) | 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 *old_fops; + + file->private_data = dvbdev; + old_fops = file->f_op; + file->f_op = fops_get(dvbdev->fops); + if (file->f_op == NULL) { + file->f_op = old_fops; + goto fail; + } + if(file->f_op->open) + err = file->f_op->open(inode,file); + if (err) { + fops_put(file->f_op); + file->f_op = fops_get(old_fops); + } + fops_put(old_fops); + up_read(&minor_rwsem); + mutex_unlock(&dvbdev_mutex); + 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++; + 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; +} + + +int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, + const struct dvb_device *template, void *priv, int type) +{ + struct dvb_device *dvbdev; + struct file_operations *dvbdevfops; + struct device *clsdev; + int minor; + int id; + + mutex_lock(&dvbdev_register_lock); + + if ((id = dvbdev_get_free_id (adap, type)) < 0){ + mutex_unlock(&dvbdev_register_lock); + *pdvbdev = NULL; + printk(KERN_ERR "%s: couldn't find free device id\n", __func__); + return -ENFILE; + } + + *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); + + if (!dvbdev){ + mutex_unlock(&dvbdev_register_lock); + return -ENOMEM; + } + + dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); + + if (!dvbdevfops){ + kfree (dvbdev); + mutex_unlock(&dvbdev_register_lock); + return -ENOMEM; + } + + memcpy(dvbdev, template, sizeof(struct dvb_device)); + dvbdev->type = type; + dvbdev->id = id; + dvbdev->adapter = adap; + dvbdev->priv = priv; + dvbdev->fops = dvbdevfops; + init_waitqueue_head (&dvbdev->wait_queue); + + memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); + 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) { + kfree(dvbdevfops); + 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] = dvbdev; + up_write(&minor_rwsem); + + mutex_unlock(&dvbdev_register_lock); + + 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)) { + printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n", + __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); + return PTR_ERR(clsdev); + } + + dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", + adap->num, dnames[type], id, minor, minor); + + return 0; +} +EXPORT_SYMBOL(dvb_register_device); + + +void dvb_unregister_device(struct dvb_device *dvbdev) +{ + if (!dvbdev) + return; + + down_write(&minor_rwsem); + dvb_minors[dvbdev->minor] = NULL; + up_write(&minor_rwsem); + + device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); + + list_del (&dvbdev->list_head); + kfree (dvbdev->fops); + kfree (dvbdev); +} +EXPORT_SYMBOL(dvb_unregister_device); + +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); + + printk(KERN_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); + + 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 dependecy + 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 */ + mutex_lock(&dvbdev_mutex); + if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) + err = -EINVAL; + mutex_unlock(&dvbdev_mutex); + + 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; +} + +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) { + printk(KERN_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) { + printk(KERN_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) +{ + class_destroy(dvb_class); + cdev_del(&dvb_device_cdev); + unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); +} + +subsys_initcall(init_dvbdev); +module_exit(exit_dvbdev); + +MODULE_DESCRIPTION("DVB Core Driver"); +MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); +MODULE_LICENSE("GPL"); |