1 files changed, 506 insertions, 0 deletions

diff --git a/drivers/media/dvb/dvb-core/dvbdev.c b/drivers/media/dvb/dvb-core/dvbdev.c
new file mode 100644
index 00000000000..f7328777595
--- /dev/null
+++ b/drivers/media/dvb/dvb-core/dvbdev.c
@@ -0,0 +1,506 @@
+/*
+ * 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);
+                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, mode_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");