Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 | 28 | #include <linux/kernel.h> |
1da177e4 LT |
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> | |
1e4baed3 | 34 | #include <linux/mutex.h> |
1da177e4 LT |
35 | #include "dvbdev.h" |
36 | ||
72024f1e | 37 | static DEFINE_MUTEX(dvbdev_mutex); |
1da177e4 LT |
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); | |
1e4baed3 | 46 | static DEFINE_MUTEX(dvbdev_register_lock); |
1da177e4 LT |
47 | |
48 | static const char * const dnames[] = { | |
afd1a0c9 | 49 | "video", "audio", "sec", "frontend", "demux", "dvr", "ca", |
1da177e4 LT |
50 | "net", "osd" |
51 | }; | |
52 | ||
5dd3f307 AO |
53 | #ifdef CONFIG_DVB_DYNAMIC_MINORS |
54 | #define MAX_DVB_MINORS 256 | |
55 | #define DVB_MAX_IDS MAX_DVB_MINORS | |
56 | #else | |
1da177e4 LT |
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) | |
5dd3f307 | 60 | #endif |
1da177e4 | 61 | |
56b22935 | 62 | static struct class *dvb_class; |
1da177e4 | 63 | |
5dd3f307 AO |
64 | static struct dvb_device *dvb_minors[MAX_DVB_MINORS]; |
65 | static DECLARE_RWSEM(minor_rwsem); | |
1da177e4 LT |
66 | |
67 | static int dvb_device_open(struct inode *inode, struct file *file) | |
68 | { | |
69 | struct dvb_device *dvbdev; | |
70 | ||
72024f1e | 71 | mutex_lock(&dvbdev_mutex); |
5dd3f307 AO |
72 | down_read(&minor_rwsem); |
73 | dvbdev = dvb_minors[iminor(inode)]; | |
1da177e4 LT |
74 | |
75 | if (dvbdev && dvbdev->fops) { | |
76 | int err = 0; | |
e84f9e57 | 77 | const struct file_operations *new_fops; |
1da177e4 | 78 | |
e84f9e57 AV |
79 | new_fops = fops_get(dvbdev->fops); |
80 | if (!new_fops) | |
f41ced8f | 81 | goto fail; |
e84f9e57 AV |
82 | file->private_data = dvbdev; |
83 | replace_fops(file, new_fops); | |
84 | if (file->f_op->open) | |
50c25fff | 85 | err = file->f_op->open(inode,file); |
5dd3f307 | 86 | up_read(&minor_rwsem); |
72024f1e | 87 | mutex_unlock(&dvbdev_mutex); |
afd1a0c9 | 88 | return err; |
1da177e4 | 89 | } |
f41ced8f | 90 | fail: |
5dd3f307 | 91 | up_read(&minor_rwsem); |
72024f1e | 92 | mutex_unlock(&dvbdev_mutex); |
1da177e4 LT |
93 | return -ENODEV; |
94 | } | |
95 | ||
96 | ||
27a643b1 | 97 | static const struct file_operations dvb_device_fops = |
1da177e4 LT |
98 | { |
99 | .owner = THIS_MODULE, | |
100 | .open = dvb_device_open, | |
6038f373 | 101 | .llseek = noop_llseek, |
1da177e4 LT |
102 | }; |
103 | ||
7e7654a9 | 104 | static struct cdev dvb_device_cdev; |
1da177e4 LT |
105 | |
106 | int dvb_generic_open(struct inode *inode, struct file *file) | |
107 | { | |
afd1a0c9 | 108 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 | 109 | |
afd1a0c9 MCC |
110 | if (!dvbdev) |
111 | return -ENODEV; | |
1da177e4 LT |
112 | |
113 | if (!dvbdev->users) | |
afd1a0c9 | 114 | return -EBUSY; |
1da177e4 LT |
115 | |
116 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
afd1a0c9 MCC |
117 | if (!dvbdev->readers) |
118 | return -EBUSY; | |
1da177e4 LT |
119 | dvbdev->readers--; |
120 | } else { | |
afd1a0c9 MCC |
121 | if (!dvbdev->writers) |
122 | return -EBUSY; | |
1da177e4 LT |
123 | dvbdev->writers--; |
124 | } | |
125 | ||
126 | dvbdev->users--; | |
127 | return 0; | |
128 | } | |
129 | EXPORT_SYMBOL(dvb_generic_open); | |
130 | ||
131 | ||
132 | int dvb_generic_release(struct inode *inode, struct file *file) | |
133 | { | |
afd1a0c9 | 134 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 LT |
135 | |
136 | if (!dvbdev) | |
afd1a0c9 | 137 | return -ENODEV; |
1da177e4 LT |
138 | |
139 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
140 | dvbdev->readers++; | |
141 | } else { | |
142 | dvbdev->writers++; | |
143 | } | |
144 | ||
145 | dvbdev->users++; | |
146 | return 0; | |
147 | } | |
148 | EXPORT_SYMBOL(dvb_generic_release); | |
149 | ||
150 | ||
16ef8def AB |
151 | long dvb_generic_ioctl(struct file *file, |
152 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 153 | { |
afd1a0c9 | 154 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 | 155 | |
afd1a0c9 MCC |
156 | if (!dvbdev) |
157 | return -ENODEV; | |
1da177e4 LT |
158 | |
159 | if (!dvbdev->kernel_ioctl) | |
160 | return -EINVAL; | |
161 | ||
72024f1e | 162 | return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); |
1da177e4 LT |
163 | } |
164 | EXPORT_SYMBOL(dvb_generic_ioctl); | |
165 | ||
166 | ||
167 | static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) | |
168 | { | |
169 | u32 id = 0; | |
170 | ||
171 | while (id < DVB_MAX_IDS) { | |
79482619 TP |
172 | struct dvb_device *dev; |
173 | list_for_each_entry(dev, &adap->device_list, list_head) | |
1da177e4 LT |
174 | if (dev->type == type && dev->id == id) |
175 | goto skip; | |
1da177e4 LT |
176 | return id; |
177 | skip: | |
178 | id++; | |
179 | } | |
180 | return -ENFILE; | |
181 | } | |
182 | ||
183 | ||
184 | int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, | |
185 | const struct dvb_device *template, void *priv, int type) | |
186 | { | |
187 | struct dvb_device *dvbdev; | |
b6190102 | 188 | struct file_operations *dvbdevfops; |
5f553388 | 189 | struct device *clsdev; |
5dd3f307 | 190 | int minor; |
1da177e4 LT |
191 | int id; |
192 | ||
c2788502 | 193 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 194 | |
b6190102 | 195 | if ((id = dvbdev_get_free_id (adap, type)) < 0){ |
1e4baed3 | 196 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 | 197 | *pdvbdev = NULL; |
46b4f7c1 | 198 | printk(KERN_ERR "%s: couldn't find free device id\n", __func__); |
1da177e4 LT |
199 | return -ENFILE; |
200 | } | |
201 | ||
202 | *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); | |
203 | ||
b6190102 MS |
204 | if (!dvbdev){ |
205 | mutex_unlock(&dvbdev_register_lock); | |
206 | return -ENOMEM; | |
207 | } | |
208 | ||
209 | dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); | |
210 | ||
211 | if (!dvbdevfops){ | |
212 | kfree (dvbdev); | |
1e4baed3 | 213 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
214 | return -ENOMEM; |
215 | } | |
216 | ||
1da177e4 LT |
217 | memcpy(dvbdev, template, sizeof(struct dvb_device)); |
218 | dvbdev->type = type; | |
219 | dvbdev->id = id; | |
220 | dvbdev->adapter = adap; | |
221 | dvbdev->priv = priv; | |
b6190102 | 222 | dvbdev->fops = dvbdevfops; |
ca5be9cd | 223 | init_waitqueue_head (&dvbdev->wait_queue); |
1da177e4 | 224 | |
784e29d2 JE |
225 | memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); |
226 | dvbdevfops->owner = adap->module; | |
1da177e4 LT |
227 | |
228 | list_add_tail (&dvbdev->list_head, &adap->device_list); | |
229 | ||
5dd3f307 AO |
230 | down_write(&minor_rwsem); |
231 | #ifdef CONFIG_DVB_DYNAMIC_MINORS | |
232 | for (minor = 0; minor < MAX_DVB_MINORS; minor++) | |
233 | if (dvb_minors[minor] == NULL) | |
234 | break; | |
235 | ||
236 | if (minor == MAX_DVB_MINORS) { | |
237 | kfree(dvbdevfops); | |
238 | kfree(dvbdev); | |
82163edc | 239 | up_write(&minor_rwsem); |
5dd3f307 AO |
240 | mutex_unlock(&dvbdev_register_lock); |
241 | return -EINVAL; | |
242 | } | |
243 | #else | |
244 | minor = nums2minor(adap->num, type, id); | |
245 | #endif | |
246 | ||
247 | dvbdev->minor = minor; | |
248 | dvb_minors[minor] = dvbdev; | |
249 | up_write(&minor_rwsem); | |
250 | ||
f47f4763 AQ |
251 | mutex_unlock(&dvbdev_register_lock); |
252 | ||
a9b12619 | 253 | clsdev = device_create(dvb_class, adap->device, |
b7496780 | 254 | MKDEV(DVB_MAJOR, minor), |
a5f4c0ce | 255 | dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); |
4abdcf93 SA |
256 | if (IS_ERR(clsdev)) { |
257 | printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n", | |
46b4f7c1 | 258 | __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); |
4abdcf93 SA |
259 | return PTR_ERR(clsdev); |
260 | } | |
1da177e4 | 261 | |
900858ec | 262 | dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", |
5dd3f307 | 263 | adap->num, dnames[type], id, minor, minor); |
1da177e4 LT |
264 | |
265 | return 0; | |
266 | } | |
267 | EXPORT_SYMBOL(dvb_register_device); | |
268 | ||
269 | ||
270 | void dvb_unregister_device(struct dvb_device *dvbdev) | |
271 | { | |
272 | if (!dvbdev) | |
273 | return; | |
274 | ||
5dd3f307 AO |
275 | down_write(&minor_rwsem); |
276 | dvb_minors[dvbdev->minor] = NULL; | |
277 | up_write(&minor_rwsem); | |
278 | ||
279 | device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); | |
1da177e4 LT |
280 | |
281 | list_del (&dvbdev->list_head); | |
b6190102 | 282 | kfree (dvbdev->fops); |
1da177e4 LT |
283 | kfree (dvbdev); |
284 | } | |
285 | EXPORT_SYMBOL(dvb_unregister_device); | |
286 | ||
78e92006 JG |
287 | static int dvbdev_check_free_adapter_num(int num) |
288 | { | |
289 | struct list_head *entry; | |
290 | list_for_each(entry, &dvb_adapter_list) { | |
291 | struct dvb_adapter *adap; | |
292 | adap = list_entry(entry, struct dvb_adapter, list_head); | |
293 | if (adap->num == num) | |
294 | return 0; | |
295 | } | |
296 | return 1; | |
297 | } | |
1da177e4 LT |
298 | |
299 | static int dvbdev_get_free_adapter_num (void) | |
300 | { | |
301 | int num = 0; | |
302 | ||
303 | while (num < DVB_MAX_ADAPTERS) { | |
78e92006 JG |
304 | if (dvbdev_check_free_adapter_num(num)) |
305 | return num; | |
1da177e4 LT |
306 | num++; |
307 | } | |
308 | ||
309 | return -ENFILE; | |
310 | } | |
311 | ||
312 | ||
78e92006 JG |
313 | int dvb_register_adapter(struct dvb_adapter *adap, const char *name, |
314 | struct module *module, struct device *device, | |
315 | short *adapter_nums) | |
1da177e4 | 316 | { |
78e92006 | 317 | int i, num; |
1da177e4 | 318 | |
c2788502 | 319 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 320 | |
78e92006 JG |
321 | for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { |
322 | num = adapter_nums[i]; | |
323 | if (num >= 0 && num < DVB_MAX_ADAPTERS) { | |
324 | /* use the one the driver asked for */ | |
325 | if (dvbdev_check_free_adapter_num(num)) | |
326 | break; | |
327 | } else { | |
328 | num = dvbdev_get_free_adapter_num(); | |
329 | break; | |
330 | } | |
331 | num = -1; | |
332 | } | |
333 | ||
334 | if (num < 0) { | |
1e4baed3 | 335 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
336 | return -ENFILE; |
337 | } | |
338 | ||
1da177e4 LT |
339 | memset (adap, 0, sizeof(struct dvb_adapter)); |
340 | INIT_LIST_HEAD (&adap->device_list); | |
341 | ||
900858ec | 342 | printk(KERN_INFO "DVB: registering new adapter (%s)\n", name); |
1da177e4 | 343 | |
1da177e4 LT |
344 | adap->num = num; |
345 | adap->name = name; | |
346 | adap->module = module; | |
d09dbf92 | 347 | adap->device = device; |
59b1842d DB |
348 | adap->mfe_shared = 0; |
349 | adap->mfe_dvbdev = NULL; | |
350 | mutex_init (&adap->mfe_lock); | |
1da177e4 LT |
351 | |
352 | list_add_tail (&adap->list_head, &dvb_adapter_list); | |
353 | ||
1e4baed3 | 354 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
355 | |
356 | return num; | |
357 | } | |
358 | EXPORT_SYMBOL(dvb_register_adapter); | |
359 | ||
360 | ||
361 | int dvb_unregister_adapter(struct dvb_adapter *adap) | |
362 | { | |
c2788502 | 363 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 364 | list_del (&adap->list_head); |
1e4baed3 | 365 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
366 | return 0; |
367 | } | |
368 | EXPORT_SYMBOL(dvb_unregister_adapter); | |
369 | ||
370 | /* if the miracle happens and "generic_usercopy()" is included into | |
371 | the kernel, then this can vanish. please don't make the mistake and | |
372 | define this as video_usercopy(). this will introduce a dependecy | |
373 | to the v4l "videodev.o" module, which is unnecessary for some | |
374 | cards (ie. the budget dvb-cards don't need the v4l module...) */ | |
16ef8def | 375 | int dvb_usercopy(struct file *file, |
afd1a0c9 | 376 | unsigned int cmd, unsigned long arg, |
16ef8def | 377 | int (*func)(struct file *file, |
1da177e4 LT |
378 | unsigned int cmd, void *arg)) |
379 | { | |
afd1a0c9 MCC |
380 | char sbuf[128]; |
381 | void *mbuf = NULL; | |
382 | void *parg = NULL; | |
383 | int err = -EINVAL; | |
384 | ||
385 | /* Copy arguments into temp kernel buffer */ | |
386 | switch (_IOC_DIR(cmd)) { | |
387 | case _IOC_NONE: | |
1da177e4 LT |
388 | /* |
389 | * For this command, the pointer is actually an integer | |
390 | * argument. | |
391 | */ | |
392 | parg = (void *) arg; | |
393 | break; | |
afd1a0c9 MCC |
394 | case _IOC_READ: /* some v4l ioctls are marked wrong ... */ |
395 | case _IOC_WRITE: | |
396 | case (_IOC_WRITE | _IOC_READ): | |
397 | if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { | |
50c25fff | 398 | parg = sbuf; |
afd1a0c9 | 399 | } else { |
50c25fff MK |
400 | /* too big to allocate from stack */ |
401 | mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); | |
402 | if (NULL == mbuf) | |
403 | return -ENOMEM; | |
404 | parg = mbuf; | |
afd1a0c9 MCC |
405 | } |
406 | ||
407 | err = -EFAULT; | |
408 | if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) | |
50c25fff | 409 | goto out; |
afd1a0c9 MCC |
410 | break; |
411 | } | |
412 | ||
413 | /* call driver */ | |
16ef8def | 414 | if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) |
d9751fd0 | 415 | err = -ENOTTY; |
afd1a0c9 MCC |
416 | |
417 | if (err < 0) | |
418 | goto out; | |
419 | ||
420 | /* Copy results into user buffer */ | |
421 | switch (_IOC_DIR(cmd)) | |
422 | { | |
423 | case _IOC_READ: | |
424 | case (_IOC_WRITE | _IOC_READ): | |
425 | if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) | |
50c25fff | 426 | err = -EFAULT; |
afd1a0c9 MCC |
427 | break; |
428 | } | |
1da177e4 LT |
429 | |
430 | out: | |
afd1a0c9 MCC |
431 | kfree(mbuf); |
432 | return err; | |
1da177e4 LT |
433 | } |
434 | ||
a5f4c0ce KS |
435 | static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) |
436 | { | |
437 | struct dvb_device *dvbdev = dev_get_drvdata(dev); | |
438 | ||
a5f4c0ce | 439 | add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); |
763d19bb KS |
440 | add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); |
441 | add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); | |
a5f4c0ce KS |
442 | return 0; |
443 | } | |
444 | ||
2c9ede55 | 445 | static char *dvb_devnode(struct device *dev, umode_t *mode) |
8a8bdcc7 KS |
446 | { |
447 | struct dvb_device *dvbdev = dev_get_drvdata(dev); | |
448 | ||
449 | return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", | |
450 | dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); | |
451 | } | |
452 | ||
453 | ||
1da177e4 LT |
454 | static int __init init_dvbdev(void) |
455 | { | |
456 | int retval; | |
457 | dev_t dev = MKDEV(DVB_MAJOR, 0); | |
458 | ||
459 | if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { | |
900858ec | 460 | printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR); |
1da177e4 LT |
461 | return retval; |
462 | } | |
463 | ||
464 | cdev_init(&dvb_device_cdev, &dvb_device_fops); | |
465 | if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { | |
900858ec | 466 | printk(KERN_ERR "dvb-core: unable register character device\n"); |
1da177e4 LT |
467 | goto error; |
468 | } | |
469 | ||
56b22935 | 470 | dvb_class = class_create(THIS_MODULE, "dvb"); |
1da177e4 LT |
471 | if (IS_ERR(dvb_class)) { |
472 | retval = PTR_ERR(dvb_class); | |
473 | goto error; | |
474 | } | |
a5f4c0ce | 475 | dvb_class->dev_uevent = dvb_uevent; |
e454cea2 | 476 | dvb_class->devnode = dvb_devnode; |
1da177e4 LT |
477 | return 0; |
478 | ||
479 | error: | |
480 | cdev_del(&dvb_device_cdev); | |
481 | unregister_chrdev_region(dev, MAX_DVB_MINORS); | |
482 | return retval; | |
483 | } | |
484 | ||
485 | ||
486 | static void __exit exit_dvbdev(void) | |
487 | { | |
56b22935 | 488 | class_destroy(dvb_class); |
1da177e4 | 489 | cdev_del(&dvb_device_cdev); |
afd1a0c9 | 490 | unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); |
1da177e4 LT |
491 | } |
492 | ||
4abdcf93 | 493 | subsys_initcall(init_dvbdev); |
1da177e4 LT |
494 | module_exit(exit_dvbdev); |
495 | ||
496 | MODULE_DESCRIPTION("DVB Core Driver"); | |
497 | MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); | |
498 | MODULE_LICENSE("GPL"); |