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authorMauro Carvalho Chehab <mchehab@redhat.com>2012-06-14 16:35:53 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-08-13 23:08:14 -0300
commit3d6c2bc08ac4f75bf3597740357c98f2207ca412 (patch)
treedfe6d7c9e466cef06224ffadd3310d61f41a4678 /drivers/media/dvb-core/dvbdev.c
parent5bc3cb743bbab408792c1b4ef31adf6268aa4b7e (diff)
[media] dvb: move the dvb core one level up
just like the V4L2 core, move the DVB core to drivers/media, as the intention is to get rid of both "video" and "dvb" directories. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb-core/dvbdev.c')
-rw-r--r--drivers/media/dvb-core/dvbdev.c507
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");

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