4 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>
5 * & Marcus Metzler <marcus@convergence.de>
6 * for convergence integrated media GmbH
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 2.1
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/types.h>
25 #include <linux/errno.h>
26 #include <linux/string.h>
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/kernel.h>
30 #include <linux/sched.h>
31 #include <linux/init.h>
32 #include <linux/slab.h>
33 #include <linux/device.h>
37 static int dvbdev_debug;
39 module_param(dvbdev_debug, int, 0644);
40 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
42 #define dprintk if (dvbdev_debug) printk
44 static LIST_HEAD(dvb_adapter_list);
45 static DECLARE_MUTEX(dvbdev_register_lock);
47 static const char * const dnames[] = {
48 "video", "audio", "sec", "frontend", "demux", "dvr", "ca",
54 #define nums2minor(num,type,id) ((num << 6) | (id << 4) | type)
56 struct class_simple *dvb_class;
57 EXPORT_SYMBOL(dvb_class);
59 static struct dvb_device* dvbdev_find_device (int minor)
61 struct list_head *entry;
63 list_for_each (entry, &dvb_adapter_list) {
64 struct list_head *entry0;
65 struct dvb_adapter *adap;
66 adap = list_entry (entry, struct dvb_adapter, list_head);
67 list_for_each (entry0, &adap->device_list) {
68 struct dvb_device *dev;
69 dev = list_entry (entry0, struct dvb_device, list_head);
70 if (nums2minor(adap->num, dev->type, dev->id) == minor)
79 static int dvb_device_open(struct inode *inode, struct file *file)
81 struct dvb_device *dvbdev;
83 dvbdev = dvbdev_find_device (iminor(inode));
85 if (dvbdev && dvbdev->fops) {
87 struct file_operations *old_fops;
89 file->private_data = dvbdev;
90 old_fops = file->f_op;
91 file->f_op = fops_get(dvbdev->fops);
93 err = file->f_op->open(inode,file);
96 file->f_op = fops_get(old_fops);
105 static struct file_operations dvb_device_fops =
107 .owner = THIS_MODULE,
108 .open = dvb_device_open,
112 int dvb_generic_open(struct inode *inode, struct file *file)
114 struct dvb_device *dvbdev = file->private_data;
122 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
123 if (!dvbdev->readers)
127 if (!dvbdev->writers)
135 EXPORT_SYMBOL(dvb_generic_open);
138 int dvb_generic_release(struct inode *inode, struct file *file)
140 struct dvb_device *dvbdev = file->private_data;
145 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
154 EXPORT_SYMBOL(dvb_generic_release);
157 int dvb_generic_ioctl(struct inode *inode, struct file *file,
158 unsigned int cmd, unsigned long arg)
160 struct dvb_device *dvbdev = file->private_data;
165 if (!dvbdev->kernel_ioctl)
168 return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl);
170 EXPORT_SYMBOL(dvb_generic_ioctl);
173 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
177 while (id < DVB_MAX_IDS) {
178 struct list_head *entry;
179 list_for_each (entry, &adap->device_list) {
180 struct dvb_device *dev;
181 dev = list_entry (entry, struct dvb_device, list_head);
182 if (dev->type == type && dev->id == id)
193 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
194 const struct dvb_device *template, void *priv, int type)
196 struct dvb_device *dvbdev;
199 if (down_interruptible (&dvbdev_register_lock))
202 if ((id = dvbdev_get_free_id (adap, type)) < 0) {
203 up (&dvbdev_register_lock);
205 printk ("%s: could get find free device id...\n", __FUNCTION__);
209 *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
212 up(&dvbdev_register_lock);
216 up (&dvbdev_register_lock);
218 memcpy(dvbdev, template, sizeof(struct dvb_device));
221 dvbdev->adapter = adap;
224 dvbdev->fops->owner = adap->module;
226 list_add_tail (&dvbdev->list_head, &adap->device_list);
228 devfs_mk_cdev(MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
229 S_IFCHR | S_IRUSR | S_IWUSR,
230 "dvb/adapter%d/%s%d", adap->num, dnames[type], id);
232 class_simple_device_add(dvb_class, MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
233 NULL, "dvb%d.%s%d", adap->num, dnames[type], id);
235 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
236 adap->num, dnames[type], id, nums2minor(adap->num, type, id),
237 nums2minor(adap->num, type, id));
241 EXPORT_SYMBOL(dvb_register_device);
244 void dvb_unregister_device(struct dvb_device *dvbdev)
249 devfs_remove("dvb/adapter%d/%s%d", dvbdev->adapter->num,
250 dnames[dvbdev->type], dvbdev->id);
252 class_simple_device_remove(MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num,
253 dvbdev->type, dvbdev->id)));
255 list_del(&dvbdev->list_head);
258 EXPORT_SYMBOL(dvb_unregister_device);
261 static int dvbdev_get_free_adapter_num (void)
266 struct list_head *entry;
267 list_for_each (entry, &dvb_adapter_list) {
268 struct dvb_adapter *adap;
269 adap = list_entry (entry, struct dvb_adapter, list_head);
270 if (adap->num == num)
282 int dvb_register_adapter(struct dvb_adapter **padap, const char *name, struct module *module)
284 struct dvb_adapter *adap;
287 if (down_interruptible (&dvbdev_register_lock))
290 if ((num = dvbdev_get_free_adapter_num ()) < 0) {
291 up (&dvbdev_register_lock);
295 if (!(*padap = adap = kmalloc(sizeof(struct dvb_adapter), GFP_KERNEL))) {
296 up(&dvbdev_register_lock);
300 memset (adap, 0, sizeof(struct dvb_adapter));
301 INIT_LIST_HEAD (&adap->device_list);
303 printk ("DVB: registering new adapter (%s).\n", name);
305 devfs_mk_dir("dvb/adapter%d", num);
309 adap->module = module;
311 list_add_tail (&adap->list_head, &dvb_adapter_list);
313 up (&dvbdev_register_lock);
317 EXPORT_SYMBOL(dvb_register_adapter);
320 int dvb_unregister_adapter(struct dvb_adapter *adap)
322 devfs_remove("dvb/adapter%d", adap->num);
324 if (down_interruptible (&dvbdev_register_lock))
326 list_del (&adap->list_head);
327 up (&dvbdev_register_lock);
331 EXPORT_SYMBOL(dvb_unregister_adapter);
333 /* if the miracle happens and "generic_usercopy()" is included into
334 the kernel, then this can vanish. please don't make the mistake and
335 define this as video_usercopy(). this will introduce a dependecy
336 to the v4l "videodev.o" module, which is unnecessary for some
337 cards (ie. the budget dvb-cards don't need the v4l module...) */
338 int dvb_usercopy(struct inode *inode, struct file *file,
339 unsigned int cmd, unsigned long arg,
340 int (*func)(struct inode *inode, struct file *file,
341 unsigned int cmd, void *arg))
348 /* Copy arguments into temp kernel buffer */
349 switch (_IOC_DIR(cmd)) {
352 * For this command, the pointer is actually an integer
357 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
359 case (_IOC_WRITE | _IOC_READ):
360 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
363 /* too big to allocate from stack */
364 mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
371 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
377 if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD)
383 /* Copy results into user buffer */
384 switch (_IOC_DIR(cmd))
387 case (_IOC_WRITE | _IOC_READ):
388 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
400 static int __init init_dvbdev(void)
404 if ((retval = register_chrdev(DVB_MAJOR,"DVB", &dvb_device_fops)))
405 printk("dvb-core: unable to get major %d\n", DVB_MAJOR);
409 dvb_class = class_simple_create(THIS_MODULE, "dvb");
410 if (IS_ERR(dvb_class))
411 return PTR_ERR(dvb_class);
417 static void __exit exit_dvbdev(void)
419 unregister_chrdev(DVB_MAJOR, "DVB");
421 class_simple_destroy(dvb_class);
424 module_init(init_dvbdev);
425 module_exit(exit_dvbdev);
427 MODULE_DESCRIPTION("DVB Core Driver");
428 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
429 MODULE_LICENSE("GPL");