Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * dvbdev.c
3 *
4 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de>
5 * & Marcus Metzler <marcus@convergence.de>
6 * for convergence integrated media GmbH
7 *
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.
12 *
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.
17 *
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.
21 *
22 */
23
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>
34#include <linux/fs.h>
35#include <linux/cdev.h>
36
37#include "dvbdev.h"
38
39static int dvbdev_debug;
40
41module_param(dvbdev_debug, int, 0644);
42MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
43
44#define dprintk if (dvbdev_debug) printk
45
46static LIST_HEAD(dvb_adapter_list);
47static DECLARE_MUTEX(dvbdev_register_lock);
48
49static const char * const dnames[] = {
50 "video", "audio", "sec", "frontend", "demux", "dvr", "ca",
51 "net", "osd"
52};
53
54#define DVB_MAX_ADAPTERS 8
55#define DVB_MAX_IDS 4
56#define nums2minor(num,type,id) ((num << 6) | (id << 4) | type)
57#define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
58
59static struct class *dvb_class;
60
61static struct dvb_device* dvbdev_find_device (int minor)
62{
63 struct list_head *entry;
64
65 list_for_each (entry, &dvb_adapter_list) {
66 struct list_head *entry0;
67 struct dvb_adapter *adap;
68 adap = list_entry (entry, struct dvb_adapter, list_head);
69 list_for_each (entry0, &adap->device_list) {
70 struct dvb_device *dev;
71 dev = list_entry (entry0, struct dvb_device, list_head);
72 if (nums2minor(adap->num, dev->type, dev->id) == minor)
73 return dev;
74 }
75 }
76
77 return NULL;
78}
79
80
81static int dvb_device_open(struct inode *inode, struct file *file)
82{
83 struct dvb_device *dvbdev;
84
85 dvbdev = dvbdev_find_device (iminor(inode));
86
87 if (dvbdev && dvbdev->fops) {
88 int err = 0;
89 struct file_operations *old_fops;
90
91 file->private_data = dvbdev;
92 old_fops = file->f_op;
93 file->f_op = fops_get(dvbdev->fops);
94 if(file->f_op->open)
95 err = file->f_op->open(inode,file);
96 if (err) {
97 fops_put(file->f_op);
98 file->f_op = fops_get(old_fops);
99 }
100 fops_put(old_fops);
101 return err;
102 }
103 return -ENODEV;
104}
105
106
107static struct file_operations dvb_device_fops =
108{
109 .owner = THIS_MODULE,
110 .open = dvb_device_open,
111};
112
113static struct cdev dvb_device_cdev = {
114 .kobj = {.name = "dvb", },
115 .owner = THIS_MODULE,
116};
117
118int dvb_generic_open(struct inode *inode, struct file *file)
119{
120 struct dvb_device *dvbdev = file->private_data;
121
122 if (!dvbdev)
123 return -ENODEV;
124
125 if (!dvbdev->users)
126 return -EBUSY;
127
128 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
129 if (!dvbdev->readers)
130 return -EBUSY;
131 dvbdev->readers--;
132 } else {
133 if (!dvbdev->writers)
134 return -EBUSY;
135 dvbdev->writers--;
136 }
137
138 dvbdev->users--;
139 return 0;
140}
141EXPORT_SYMBOL(dvb_generic_open);
142
143
144int dvb_generic_release(struct inode *inode, struct file *file)
145{
146 struct dvb_device *dvbdev = file->private_data;
147
148 if (!dvbdev)
149 return -ENODEV;
150
151 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
152 dvbdev->readers++;
153 } else {
154 dvbdev->writers++;
155 }
156
157 dvbdev->users++;
158 return 0;
159}
160EXPORT_SYMBOL(dvb_generic_release);
161
162
163int dvb_generic_ioctl(struct inode *inode, struct file *file,
164 unsigned int cmd, unsigned long arg)
165{
166 struct dvb_device *dvbdev = file->private_data;
167
168 if (!dvbdev)
169 return -ENODEV;
170
171 if (!dvbdev->kernel_ioctl)
172 return -EINVAL;
173
174 return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl);
175}
176EXPORT_SYMBOL(dvb_generic_ioctl);
177
178
179static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
180{
181 u32 id = 0;
182
183 while (id < DVB_MAX_IDS) {
184 struct list_head *entry;
185 list_for_each (entry, &adap->device_list) {
186 struct dvb_device *dev;
187 dev = list_entry (entry, struct dvb_device, list_head);
188 if (dev->type == type && dev->id == id)
189 goto skip;
190 }
191 return id;
192skip:
193 id++;
194 }
195 return -ENFILE;
196}
197
198
199int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
200 const struct dvb_device *template, void *priv, int type)
201{
202 struct dvb_device *dvbdev;
203 int id;
204
205 if (down_interruptible (&dvbdev_register_lock))
206 return -ERESTARTSYS;
207
208 if ((id = dvbdev_get_free_id (adap, type)) < 0) {
209 up (&dvbdev_register_lock);
210 *pdvbdev = NULL;
211 printk ("%s: could get find free device id...\n", __FUNCTION__);
212 return -ENFILE;
213 }
214
215 *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
216
217 if (!dvbdev) {
218 up(&dvbdev_register_lock);
219 return -ENOMEM;
220 }
221
222 up (&dvbdev_register_lock);
223
224 memcpy(dvbdev, template, sizeof(struct dvb_device));
225 dvbdev->type = type;
226 dvbdev->id = id;
227 dvbdev->adapter = adap;
228 dvbdev->priv = priv;
229
230 dvbdev->fops->owner = adap->module;
231
232 list_add_tail (&dvbdev->list_head, &adap->device_list);
233
234 devfs_mk_cdev(MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
235 S_IFCHR | S_IRUSR | S_IWUSR,
236 "dvb/adapter%d/%s%d", adap->num, dnames[type], id);
237
238 class_device_create(dvb_class, MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)),
239 NULL, "dvb%d.%s%d", adap->num, dnames[type], id);
240
241 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
242 adap->num, dnames[type], id, nums2minor(adap->num, type, id),
243 nums2minor(adap->num, type, id));
244
245 return 0;
246}
247EXPORT_SYMBOL(dvb_register_device);
248
249
250void dvb_unregister_device(struct dvb_device *dvbdev)
251{
252 if (!dvbdev)
253 return;
254
255 devfs_remove("dvb/adapter%d/%s%d", dvbdev->adapter->num,
256 dnames[dvbdev->type], dvbdev->id);
257
258 class_device_destroy(dvb_class, MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num,
259 dvbdev->type, dvbdev->id)));
260
261 list_del (&dvbdev->list_head);
262 kfree (dvbdev);
263}
264EXPORT_SYMBOL(dvb_unregister_device);
265
266
267static int dvbdev_get_free_adapter_num (void)
268{
269 int num = 0;
270
271 while (num < DVB_MAX_ADAPTERS) {
272 struct list_head *entry;
273 list_for_each (entry, &dvb_adapter_list) {
274 struct dvb_adapter *adap;
275 adap = list_entry (entry, struct dvb_adapter, list_head);
276 if (adap->num == num)
277 goto skip;
278 }
279 return num;
280skip:
281 num++;
282 }
283
284 return -ENFILE;
285}
286
287
288int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct module *module)
289{
290 int num;
291
292 if (down_interruptible (&dvbdev_register_lock))
293 return -ERESTARTSYS;
294
295 if ((num = dvbdev_get_free_adapter_num ()) < 0) {
296 up (&dvbdev_register_lock);
297 return -ENFILE;
298 }
299
300 memset (adap, 0, sizeof(struct dvb_adapter));
301 INIT_LIST_HEAD (&adap->device_list);
302
303 printk ("DVB: registering new adapter (%s).\n", name);
304
305 devfs_mk_dir("dvb/adapter%d", num);
306 adap->num = num;
307 adap->name = name;
308 adap->module = module;
309
310 list_add_tail (&adap->list_head, &dvb_adapter_list);
311
312 up (&dvbdev_register_lock);
313
314 return num;
315}
316EXPORT_SYMBOL(dvb_register_adapter);
317
318
319int dvb_unregister_adapter(struct dvb_adapter *adap)
320{
321 devfs_remove("dvb/adapter%d", adap->num);
322
323 if (down_interruptible (&dvbdev_register_lock))
324 return -ERESTARTSYS;
325 list_del (&adap->list_head);
326 up (&dvbdev_register_lock);
327 return 0;
328}
329EXPORT_SYMBOL(dvb_unregister_adapter);
330
331/* if the miracle happens and "generic_usercopy()" is included into
332 the kernel, then this can vanish. please don't make the mistake and
333 define this as video_usercopy(). this will introduce a dependecy
334 to the v4l "videodev.o" module, which is unnecessary for some
335 cards (ie. the budget dvb-cards don't need the v4l module...) */
336int dvb_usercopy(struct inode *inode, struct file *file,
337 unsigned int cmd, unsigned long arg,
338 int (*func)(struct inode *inode, struct file *file,
339 unsigned int cmd, void *arg))
340{
341 char sbuf[128];
342 void *mbuf = NULL;
343 void *parg = NULL;
344 int err = -EINVAL;
345
346 /* Copy arguments into temp kernel buffer */
347 switch (_IOC_DIR(cmd)) {
348 case _IOC_NONE:
349 /*
350 * For this command, the pointer is actually an integer
351 * argument.
352 */
353 parg = (void *) arg;
354 break;
355 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
356 case _IOC_WRITE:
357 case (_IOC_WRITE | _IOC_READ):
358 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
359 parg = sbuf;
360 } else {
361 /* too big to allocate from stack */
362 mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
363 if (NULL == mbuf)
364 return -ENOMEM;
365 parg = mbuf;
366 }
367
368 err = -EFAULT;
369 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
370 goto out;
371 break;
372 }
373
374 /* call driver */
375 if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD)
376 err = -EINVAL;
377
378 if (err < 0)
379 goto out;
380
381 /* Copy results into user buffer */
382 switch (_IOC_DIR(cmd))
383 {
384 case _IOC_READ:
385 case (_IOC_WRITE | _IOC_READ):
386 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
387 err = -EFAULT;
388 break;
389 }
390
391out:
392 kfree(mbuf);
393 return err;
394}
395
396static int __init init_dvbdev(void)
397{
398 int retval;
399 dev_t dev = MKDEV(DVB_MAJOR, 0);
400
401 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
402 printk("dvb-core: unable to get major %d\n", DVB_MAJOR);
403 return retval;
404 }
405
406 cdev_init(&dvb_device_cdev, &dvb_device_fops);
407 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
408 printk("dvb-core: unable to get major %d\n", DVB_MAJOR);
409 goto error;
410 }
411
412 devfs_mk_dir("dvb");
413
414 dvb_class = class_create(THIS_MODULE, "dvb");
415 if (IS_ERR(dvb_class)) {
416 retval = PTR_ERR(dvb_class);
417 goto error;
418 }
419 return 0;
420
421error:
422 cdev_del(&dvb_device_cdev);
423 unregister_chrdev_region(dev, MAX_DVB_MINORS);
424 return retval;
425}
426
427
428static void __exit exit_dvbdev(void)
429{
430 devfs_remove("dvb");
431 class_destroy(dvb_class);
432 cdev_del(&dvb_device_cdev);
433 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
434}
435
436module_init(init_dvbdev);
437module_exit(exit_dvbdev);
438
439MODULE_DESCRIPTION("DVB Core Driver");
440MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
441MODULE_LICENSE("GPL");