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/kernel.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/device.h>
32 #include <linux/fs.h>
33 #include <linux/cdev.h>
34 #include <linux/mutex.h>
35 #include <linux/smp_lock.h>
36 #include "dvbdev.h"
37
38 static int dvbdev_debug;
39
40 module_param(dvbdev_debug, int, 0644);
41 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
42
43 #define dprintk if (dvbdev_debug) printk
44
45 static LIST_HEAD(dvb_adapter_list);
46 static DEFINE_MUTEX(dvbdev_register_lock);
47
48 static const char * const dnames[] = {
49 "video", "audio", "sec", "frontend", "demux", "dvr", "ca",
50 "net", "osd"
51 };
52
53 #ifdef CONFIG_DVB_DYNAMIC_MINORS
54 #define MAX_DVB_MINORS 256
55 #define DVB_MAX_IDS MAX_DVB_MINORS
56 #else
57 #define DVB_MAX_IDS 4
58 #define nums2minor(num,type,id) ((num << 6) | (id << 4) | type)
59 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
60 #endif
61
62 static struct class *dvb_class;
63
64 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
65 static DECLARE_RWSEM(minor_rwsem);
66
67 static int dvb_device_open(struct inode *inode, struct file *file)
68 {
69 struct dvb_device *dvbdev;
70
71 lock_kernel();
72 down_read(&minor_rwsem);
73 dvbdev = dvb_minors[iminor(inode)];
74
75 if (dvbdev && dvbdev->fops) {
76 int err = 0;
77 const struct file_operations *old_fops;
78
79 file->private_data = dvbdev;
80 old_fops = file->f_op;
81 file->f_op = fops_get(dvbdev->fops);
82 if (file->f_op == NULL) {
83 file->f_op = old_fops;
84 goto fail;
85 }
86 if(file->f_op->open)
87 err = file->f_op->open(inode,file);
88 if (err) {
89 fops_put(file->f_op);
90 file->f_op = fops_get(old_fops);
91 }
92 fops_put(old_fops);
93 up_read(&minor_rwsem);
94 unlock_kernel();
95 return err;
96 }
97 fail:
98 up_read(&minor_rwsem);
99 unlock_kernel();
100 return -ENODEV;
101 }
102
103
104 static const struct file_operations dvb_device_fops =
105 {
106 .owner = THIS_MODULE,
107 .open = dvb_device_open,
108 };
109
110 static struct cdev dvb_device_cdev;
111
112 int dvb_generic_open(struct inode *inode, struct file *file)
113 {
114 struct dvb_device *dvbdev = file->private_data;
115
116 if (!dvbdev)
117 return -ENODEV;
118
119 if (!dvbdev->users)
120 return -EBUSY;
121
122 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
123 if (!dvbdev->readers)
124 return -EBUSY;
125 dvbdev->readers--;
126 } else {
127 if (!dvbdev->writers)
128 return -EBUSY;
129 dvbdev->writers--;
130 }
131
132 dvbdev->users--;
133 return 0;
134 }
135 EXPORT_SYMBOL(dvb_generic_open);
136
137
138 int dvb_generic_release(struct inode *inode, struct file *file)
139 {
140 struct dvb_device *dvbdev = file->private_data;
141
142 if (!dvbdev)
143 return -ENODEV;
144
145 if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
146 dvbdev->readers++;
147 } else {
148 dvbdev->writers++;
149 }
150
151 dvbdev->users++;
152 return 0;
153 }
154 EXPORT_SYMBOL(dvb_generic_release);
155
156
157 int dvb_generic_ioctl(struct inode *inode, struct file *file,
158 unsigned int cmd, unsigned long arg)
159 {
160 struct dvb_device *dvbdev = file->private_data;
161
162 if (!dvbdev)
163 return -ENODEV;
164
165 if (!dvbdev->kernel_ioctl)
166 return -EINVAL;
167
168 return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl);
169 }
170 EXPORT_SYMBOL(dvb_generic_ioctl);
171
172
173 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
174 {
175 u32 id = 0;
176
177 while (id < DVB_MAX_IDS) {
178 struct dvb_device *dev;
179 list_for_each_entry(dev, &adap->device_list, list_head)
180 if (dev->type == type && dev->id == id)
181 goto skip;
182 return id;
183 skip:
184 id++;
185 }
186 return -ENFILE;
187 }
188
189
190 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
191 const struct dvb_device *template, void *priv, int type)
192 {
193 struct dvb_device *dvbdev;
194 struct file_operations *dvbdevfops;
195 struct device *clsdev;
196 int minor;
197 int id;
198
199 mutex_lock(&dvbdev_register_lock);
200
201 if ((id = dvbdev_get_free_id (adap, type)) < 0){
202 mutex_unlock(&dvbdev_register_lock);
203 *pdvbdev = NULL;
204 printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
205 return -ENFILE;
206 }
207
208 *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL);
209
210 if (!dvbdev){
211 mutex_unlock(&dvbdev_register_lock);
212 return -ENOMEM;
213 }
214
215 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
216
217 if (!dvbdevfops){
218 kfree (dvbdev);
219 mutex_unlock(&dvbdev_register_lock);
220 return -ENOMEM;
221 }
222
223 memcpy(dvbdev, template, sizeof(struct dvb_device));
224 dvbdev->type = type;
225 dvbdev->id = id;
226 dvbdev->adapter = adap;
227 dvbdev->priv = priv;
228 dvbdev->fops = dvbdevfops;
229 init_waitqueue_head (&dvbdev->wait_queue);
230
231 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
232 dvbdevfops->owner = adap->module;
233
234 list_add_tail (&dvbdev->list_head, &adap->device_list);
235
236 down_write(&minor_rwsem);
237 #ifdef CONFIG_DVB_DYNAMIC_MINORS
238 for (minor = 0; minor < MAX_DVB_MINORS; minor++)
239 if (dvb_minors[minor] == NULL)
240 break;
241
242 if (minor == MAX_DVB_MINORS) {
243 kfree(dvbdevfops);
244 kfree(dvbdev);
245 mutex_unlock(&dvbdev_register_lock);
246 return -EINVAL;
247 }
248 #else
249 minor = nums2minor(adap->num, type, id);
250 #endif
251
252 dvbdev->minor = minor;
253 dvb_minors[minor] = dvbdev;
254 up_write(&minor_rwsem);
255
256 mutex_unlock(&dvbdev_register_lock);
257
258 clsdev = device_create(dvb_class, adap->device,
259 MKDEV(DVB_MAJOR, minor),
260 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
261 if (IS_ERR(clsdev)) {
262 printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
263 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
264 return PTR_ERR(clsdev);
265 }
266
267 dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
268 adap->num, dnames[type], id, minor, minor);
269
270 return 0;
271 }
272 EXPORT_SYMBOL(dvb_register_device);
273
274
275 void dvb_unregister_device(struct dvb_device *dvbdev)
276 {
277 if (!dvbdev)
278 return;
279
280 down_write(&minor_rwsem);
281 dvb_minors[dvbdev->minor] = NULL;
282 up_write(&minor_rwsem);
283
284 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
285
286 list_del (&dvbdev->list_head);
287 kfree (dvbdev->fops);
288 kfree (dvbdev);
289 }
290 EXPORT_SYMBOL(dvb_unregister_device);
291
292 static int dvbdev_check_free_adapter_num(int num)
293 {
294 struct list_head *entry;
295 list_for_each(entry, &dvb_adapter_list) {
296 struct dvb_adapter *adap;
297 adap = list_entry(entry, struct dvb_adapter, list_head);
298 if (adap->num == num)
299 return 0;
300 }
301 return 1;
302 }
303
304 static int dvbdev_get_free_adapter_num (void)
305 {
306 int num = 0;
307
308 while (num < DVB_MAX_ADAPTERS) {
309 if (dvbdev_check_free_adapter_num(num))
310 return num;
311 num++;
312 }
313
314 return -ENFILE;
315 }
316
317
318 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
319 struct module *module, struct device *device,
320 short *adapter_nums)
321 {
322 int i, num;
323
324 mutex_lock(&dvbdev_register_lock);
325
326 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
327 num = adapter_nums[i];
328 if (num >= 0 && num < DVB_MAX_ADAPTERS) {
329 /* use the one the driver asked for */
330 if (dvbdev_check_free_adapter_num(num))
331 break;
332 } else {
333 num = dvbdev_get_free_adapter_num();
334 break;
335 }
336 num = -1;
337 }
338
339 if (num < 0) {
340 mutex_unlock(&dvbdev_register_lock);
341 return -ENFILE;
342 }
343
344 memset (adap, 0, sizeof(struct dvb_adapter));
345 INIT_LIST_HEAD (&adap->device_list);
346
347 printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
348
349 adap->num = num;
350 adap->name = name;
351 adap->module = module;
352 adap->device = device;
353 adap->mfe_shared = 0;
354 adap->mfe_dvbdev = NULL;
355 mutex_init (&adap->mfe_lock);
356
357 list_add_tail (&adap->list_head, &dvb_adapter_list);
358
359 mutex_unlock(&dvbdev_register_lock);
360
361 return num;
362 }
363 EXPORT_SYMBOL(dvb_register_adapter);
364
365
366 int dvb_unregister_adapter(struct dvb_adapter *adap)
367 {
368 mutex_lock(&dvbdev_register_lock);
369 list_del (&adap->list_head);
370 mutex_unlock(&dvbdev_register_lock);
371 return 0;
372 }
373 EXPORT_SYMBOL(dvb_unregister_adapter);
374
375 /* if the miracle happens and "generic_usercopy()" is included into
376 the kernel, then this can vanish. please don't make the mistake and
377 define this as video_usercopy(). this will introduce a dependecy
378 to the v4l "videodev.o" module, which is unnecessary for some
379 cards (ie. the budget dvb-cards don't need the v4l module...) */
380 int dvb_usercopy(struct inode *inode, struct file *file,
381 unsigned int cmd, unsigned long arg,
382 int (*func)(struct inode *inode, struct file *file,
383 unsigned int cmd, void *arg))
384 {
385 char sbuf[128];
386 void *mbuf = NULL;
387 void *parg = NULL;
388 int err = -EINVAL;
389
390 /* Copy arguments into temp kernel buffer */
391 switch (_IOC_DIR(cmd)) {
392 case _IOC_NONE:
393 /*
394 * For this command, the pointer is actually an integer
395 * argument.
396 */
397 parg = (void *) arg;
398 break;
399 case _IOC_READ: /* some v4l ioctls are marked wrong ... */
400 case _IOC_WRITE:
401 case (_IOC_WRITE | _IOC_READ):
402 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
403 parg = sbuf;
404 } else {
405 /* too big to allocate from stack */
406 mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
407 if (NULL == mbuf)
408 return -ENOMEM;
409 parg = mbuf;
410 }
411
412 err = -EFAULT;
413 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
414 goto out;
415 break;
416 }
417
418 /* call driver */
419 if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD)
420 err = -EINVAL;
421
422 if (err < 0)
423 goto out;
424
425 /* Copy results into user buffer */
426 switch (_IOC_DIR(cmd))
427 {
428 case _IOC_READ:
429 case (_IOC_WRITE | _IOC_READ):
430 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
431 err = -EFAULT;
432 break;
433 }
434
435 out:
436 kfree(mbuf);
437 return err;
438 }
439
440 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
441 {
442 struct dvb_device *dvbdev = dev_get_drvdata(dev);
443
444 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
445 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
446 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
447 return 0;
448 }
449
450 static char *dvb_nodename(struct device *dev)
451 {
452 struct dvb_device *dvbdev = dev_get_drvdata(dev);
453
454 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
455 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
456 }
457
458
459 static int __init init_dvbdev(void)
460 {
461 int retval;
462 dev_t dev = MKDEV(DVB_MAJOR, 0);
463
464 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
465 printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
466 return retval;
467 }
468
469 cdev_init(&dvb_device_cdev, &dvb_device_fops);
470 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
471 printk(KERN_ERR "dvb-core: unable register character device\n");
472 goto error;
473 }
474
475 dvb_class = class_create(THIS_MODULE, "dvb");
476 if (IS_ERR(dvb_class)) {
477 retval = PTR_ERR(dvb_class);
478 goto error;
479 }
480 dvb_class->dev_uevent = dvb_uevent;
481 dvb_class->nodename = dvb_nodename;
482 return 0;
483
484 error:
485 cdev_del(&dvb_device_cdev);
486 unregister_chrdev_region(dev, MAX_DVB_MINORS);
487 return retval;
488 }
489
490
491 static void __exit exit_dvbdev(void)
492 {
493 class_destroy(dvb_class);
494 cdev_del(&dvb_device_cdev);
495 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
496 }
497
498 subsys_initcall(init_dvbdev);
499 module_exit(exit_dvbdev);
500
501 MODULE_DESCRIPTION("DVB Core Driver");
502 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
503 MODULE_LICENSE("GPL");
504
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