Creation of Cybook 2416 (actually Gen4) repository

drivers/media/dvb/dvb-core/dvbdev.c

@@ -0,0 +1,438 @@
+/*
+ * 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/moduleparam.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 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"
+};
+
+#define DVB_MAX_ADAPTERS	8
+#define DVB_MAX_IDS		4
+#define nums2minor(num,type,id)	((num << 6) | (id << 4) | type)
+#define MAX_DVB_MINORS		(DVB_MAX_ADAPTERS*64)
+
+static struct class *dvb_class;
+
+static struct dvb_device* dvbdev_find_device (int minor)
+{
+	struct list_head *entry;
+
+	list_for_each (entry, &dvb_adapter_list) {
+		struct list_head *entry0;
+		struct dvb_adapter *adap;
+		adap = list_entry (entry, struct dvb_adapter, list_head);
+		list_for_each (entry0, &adap->device_list) {
+			struct dvb_device *dev;
+			dev = list_entry (entry0, struct dvb_device, list_head);
+			if (nums2minor(adap->num, dev->type, dev->id) == minor)
+				return dev;
+		}
+	}
+
+	return NULL;
+}
+
+
+static int dvb_device_open(struct inode *inode, struct file *file)
+{
+	struct dvb_device *dvbdev;
+
+	dvbdev = dvbdev_find_device (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->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);
+		return err;
+	}
+	return -ENODEV;
+}
+
+
+static struct file_operations dvb_device_fops =
+{
+	.owner =	THIS_MODULE,
+	.open =		dvb_device_open,
+};
+
+static struct cdev dvb_device_cdev = {
+	.kobj   = {.name = "dvb", },
+	.owner  =       THIS_MODULE,
+};
+
+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);
+
+
+int dvb_generic_ioctl(struct inode *inode, 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 (inode, 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 list_head *entry;
+		list_for_each (entry, &adap->device_list) {
+			struct dvb_device *dev;
+			dev = list_entry (entry, struct dvb_device, 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;
+
+	int id;
+
+	mutex_lock(&dvbdev_register_lock);
+
+	if ((id = dvbdev_get_free_id (adap, type)) < 0){
+		mutex_unlock(&dvbdev_register_lock);
+		*pdvbdev = NULL;
+		printk ("%s: could get find free device id...\n", __FUNCTION__);
+		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;
+
+	memcpy(dvbdev->fops, template->fops, sizeof(struct file_operations));
+	dvbdev->fops->owner = adap->module;
+
+	list_add_tail (&dvbdev->list_head, &adap->device_list);
+
+	mutex_unlock(&dvbdev_register_lock);
+
+	class_device_create(dvb_class, NULL, MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
+			    adap->device, "dvb%d.%s%d", adap->num, dnames[type], id);
+
+	dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
+		adap->num, dnames[type], id, nums2minor(adap->num, type, id),
+		nums2minor(adap->num, type, id));
+
+	return 0;
+}
+EXPORT_SYMBOL(dvb_register_device);
+
+
+void dvb_unregister_device(struct dvb_device *dvbdev)
+{
+	if (!dvbdev)
+		return;
+
+	class_device_destroy(dvb_class, MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num,
+					dvbdev->type, dvbdev->id)));
+
+	list_del (&dvbdev->list_head);
+	kfree (dvbdev->fops);
+	kfree (dvbdev);
+}
+EXPORT_SYMBOL(dvb_unregister_device);
+
+
+static int dvbdev_get_free_adapter_num (void)
+{
+	int num = 0;
+
+	while (num < DVB_MAX_ADAPTERS) {
+		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)
+				goto skip;
+		}
+		return num;
+skip:
+		num++;
+	}
+
+	return -ENFILE;
+}
+
+
+int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct module *module, struct device *device)
+{
+	int num;
+
+	mutex_lock(&dvbdev_register_lock);
+
+	if ((num = dvbdev_get_free_adapter_num ()) < 0) {
+		mutex_unlock(&dvbdev_register_lock);
+		return -ENFILE;
+	}
+
+	memset (adap, 0, sizeof(struct dvb_adapter));
+	INIT_LIST_HEAD (&adap->device_list);
+
+	printk ("DVB: registering new adapter (%s).\n", name);
+
+	adap->num = num;
+	adap->name = name;
+	adap->module = module;
+	adap->device = device;
+
+	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 inode *inode, struct file *file,
+		     unsigned int cmd, unsigned long arg,
+		     int (*func)(struct inode *inode, 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(inode, file, cmd, parg)) == -ENOIOCTLCMD)
+		err = -EINVAL;
+
+	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 __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("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("dvb-core: unable to get major %d\n", DVB_MAJOR);
+		goto error;
+	}
+
+	dvb_class = class_create(THIS_MODULE, "dvb");
+	if (IS_ERR(dvb_class)) {
+		retval = PTR_ERR(dvb_class);
+		goto error;
+	}
+	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);
+}
+
+module_init(init_dvbdev);
+module_exit(exit_dvbdev);
+
+MODULE_DESCRIPTION("DVB Core Driver");
+MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
+MODULE_LICENSE("GPL");