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- /*
- * 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");
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