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> |
5794e1b1 | 35 | #include <linux/smp_lock.h> |
1da177e4 LT |
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); | |
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 | ||
5794e1b1 | 71 | lock_kernel(); |
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; | |
99ac48f5 | 77 | const struct file_operations *old_fops; |
1da177e4 LT |
78 | |
79 | file->private_data = dvbdev; | |
80 | old_fops = file->f_op; | |
afd1a0c9 | 81 | file->f_op = fops_get(dvbdev->fops); |
f41ced8f LP |
82 | if (file->f_op == NULL) { |
83 | file->f_op = old_fops; | |
84 | goto fail; | |
85 | } | |
afd1a0c9 | 86 | if(file->f_op->open) |
50c25fff | 87 | err = file->f_op->open(inode,file); |
afd1a0c9 | 88 | if (err) { |
50c25fff MK |
89 | fops_put(file->f_op); |
90 | file->f_op = fops_get(old_fops); | |
afd1a0c9 MCC |
91 | } |
92 | fops_put(old_fops); | |
5dd3f307 | 93 | up_read(&minor_rwsem); |
5794e1b1 | 94 | unlock_kernel(); |
afd1a0c9 | 95 | return err; |
1da177e4 | 96 | } |
f41ced8f | 97 | fail: |
5dd3f307 | 98 | up_read(&minor_rwsem); |
5794e1b1 | 99 | unlock_kernel(); |
1da177e4 LT |
100 | return -ENODEV; |
101 | } | |
102 | ||
103 | ||
27a643b1 | 104 | static const struct file_operations dvb_device_fops = |
1da177e4 LT |
105 | { |
106 | .owner = THIS_MODULE, | |
107 | .open = dvb_device_open, | |
6038f373 | 108 | .llseek = noop_llseek, |
1da177e4 LT |
109 | }; |
110 | ||
7e7654a9 | 111 | static struct cdev dvb_device_cdev; |
1da177e4 LT |
112 | |
113 | int dvb_generic_open(struct inode *inode, struct file *file) | |
114 | { | |
afd1a0c9 | 115 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 | 116 | |
afd1a0c9 MCC |
117 | if (!dvbdev) |
118 | return -ENODEV; | |
1da177e4 LT |
119 | |
120 | if (!dvbdev->users) | |
afd1a0c9 | 121 | return -EBUSY; |
1da177e4 LT |
122 | |
123 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
afd1a0c9 MCC |
124 | if (!dvbdev->readers) |
125 | return -EBUSY; | |
1da177e4 LT |
126 | dvbdev->readers--; |
127 | } else { | |
afd1a0c9 MCC |
128 | if (!dvbdev->writers) |
129 | return -EBUSY; | |
1da177e4 LT |
130 | dvbdev->writers--; |
131 | } | |
132 | ||
133 | dvbdev->users--; | |
134 | return 0; | |
135 | } | |
136 | EXPORT_SYMBOL(dvb_generic_open); | |
137 | ||
138 | ||
139 | int dvb_generic_release(struct inode *inode, struct file *file) | |
140 | { | |
afd1a0c9 | 141 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 LT |
142 | |
143 | if (!dvbdev) | |
afd1a0c9 | 144 | return -ENODEV; |
1da177e4 LT |
145 | |
146 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
147 | dvbdev->readers++; | |
148 | } else { | |
149 | dvbdev->writers++; | |
150 | } | |
151 | ||
152 | dvbdev->users++; | |
153 | return 0; | |
154 | } | |
155 | EXPORT_SYMBOL(dvb_generic_release); | |
156 | ||
157 | ||
16ef8def AB |
158 | long dvb_generic_ioctl(struct file *file, |
159 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 160 | { |
afd1a0c9 | 161 | struct dvb_device *dvbdev = file->private_data; |
16ef8def | 162 | int ret; |
1da177e4 | 163 | |
afd1a0c9 MCC |
164 | if (!dvbdev) |
165 | return -ENODEV; | |
1da177e4 LT |
166 | |
167 | if (!dvbdev->kernel_ioctl) | |
168 | return -EINVAL; | |
169 | ||
16ef8def AB |
170 | lock_kernel(); |
171 | ret = dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); | |
172 | unlock_kernel(); | |
173 | ||
174 | return ret; | |
1da177e4 LT |
175 | } |
176 | EXPORT_SYMBOL(dvb_generic_ioctl); | |
177 | ||
178 | ||
179 | static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) | |
180 | { | |
181 | u32 id = 0; | |
182 | ||
183 | while (id < DVB_MAX_IDS) { | |
79482619 TP |
184 | struct dvb_device *dev; |
185 | list_for_each_entry(dev, &adap->device_list, list_head) | |
1da177e4 LT |
186 | if (dev->type == type && dev->id == id) |
187 | goto skip; | |
1da177e4 LT |
188 | return id; |
189 | skip: | |
190 | id++; | |
191 | } | |
192 | return -ENFILE; | |
193 | } | |
194 | ||
195 | ||
196 | int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, | |
197 | const struct dvb_device *template, void *priv, int type) | |
198 | { | |
199 | struct dvb_device *dvbdev; | |
b6190102 | 200 | struct file_operations *dvbdevfops; |
5f553388 | 201 | struct device *clsdev; |
5dd3f307 | 202 | int minor; |
1da177e4 LT |
203 | int id; |
204 | ||
c2788502 | 205 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 206 | |
b6190102 | 207 | if ((id = dvbdev_get_free_id (adap, type)) < 0){ |
1e4baed3 | 208 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 | 209 | *pdvbdev = NULL; |
46b4f7c1 | 210 | printk(KERN_ERR "%s: couldn't find free device id\n", __func__); |
1da177e4 LT |
211 | return -ENFILE; |
212 | } | |
213 | ||
214 | *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); | |
215 | ||
b6190102 MS |
216 | if (!dvbdev){ |
217 | mutex_unlock(&dvbdev_register_lock); | |
218 | return -ENOMEM; | |
219 | } | |
220 | ||
221 | dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); | |
222 | ||
223 | if (!dvbdevfops){ | |
224 | kfree (dvbdev); | |
1e4baed3 | 225 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
226 | return -ENOMEM; |
227 | } | |
228 | ||
1da177e4 LT |
229 | memcpy(dvbdev, template, sizeof(struct dvb_device)); |
230 | dvbdev->type = type; | |
231 | dvbdev->id = id; | |
232 | dvbdev->adapter = adap; | |
233 | dvbdev->priv = priv; | |
b6190102 | 234 | dvbdev->fops = dvbdevfops; |
ca5be9cd | 235 | init_waitqueue_head (&dvbdev->wait_queue); |
1da177e4 | 236 | |
784e29d2 JE |
237 | memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); |
238 | dvbdevfops->owner = adap->module; | |
1da177e4 LT |
239 | |
240 | list_add_tail (&dvbdev->list_head, &adap->device_list); | |
241 | ||
5dd3f307 AO |
242 | down_write(&minor_rwsem); |
243 | #ifdef CONFIG_DVB_DYNAMIC_MINORS | |
244 | for (minor = 0; minor < MAX_DVB_MINORS; minor++) | |
245 | if (dvb_minors[minor] == NULL) | |
246 | break; | |
247 | ||
248 | if (minor == MAX_DVB_MINORS) { | |
249 | kfree(dvbdevfops); | |
250 | kfree(dvbdev); | |
251 | mutex_unlock(&dvbdev_register_lock); | |
252 | return -EINVAL; | |
253 | } | |
254 | #else | |
255 | minor = nums2minor(adap->num, type, id); | |
256 | #endif | |
257 | ||
258 | dvbdev->minor = minor; | |
259 | dvb_minors[minor] = dvbdev; | |
260 | up_write(&minor_rwsem); | |
261 | ||
f47f4763 AQ |
262 | mutex_unlock(&dvbdev_register_lock); |
263 | ||
a9b12619 | 264 | clsdev = device_create(dvb_class, adap->device, |
b7496780 | 265 | MKDEV(DVB_MAJOR, minor), |
a5f4c0ce | 266 | dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); |
4abdcf93 SA |
267 | if (IS_ERR(clsdev)) { |
268 | printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n", | |
46b4f7c1 | 269 | __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); |
4abdcf93 SA |
270 | return PTR_ERR(clsdev); |
271 | } | |
1da177e4 | 272 | |
900858ec | 273 | dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", |
5dd3f307 | 274 | adap->num, dnames[type], id, minor, minor); |
1da177e4 LT |
275 | |
276 | return 0; | |
277 | } | |
278 | EXPORT_SYMBOL(dvb_register_device); | |
279 | ||
280 | ||
281 | void dvb_unregister_device(struct dvb_device *dvbdev) | |
282 | { | |
283 | if (!dvbdev) | |
284 | return; | |
285 | ||
5dd3f307 AO |
286 | down_write(&minor_rwsem); |
287 | dvb_minors[dvbdev->minor] = NULL; | |
288 | up_write(&minor_rwsem); | |
289 | ||
290 | device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); | |
1da177e4 LT |
291 | |
292 | list_del (&dvbdev->list_head); | |
b6190102 | 293 | kfree (dvbdev->fops); |
1da177e4 LT |
294 | kfree (dvbdev); |
295 | } | |
296 | EXPORT_SYMBOL(dvb_unregister_device); | |
297 | ||
78e92006 JG |
298 | static int dvbdev_check_free_adapter_num(int num) |
299 | { | |
300 | struct list_head *entry; | |
301 | list_for_each(entry, &dvb_adapter_list) { | |
302 | struct dvb_adapter *adap; | |
303 | adap = list_entry(entry, struct dvb_adapter, list_head); | |
304 | if (adap->num == num) | |
305 | return 0; | |
306 | } | |
307 | return 1; | |
308 | } | |
1da177e4 LT |
309 | |
310 | static int dvbdev_get_free_adapter_num (void) | |
311 | { | |
312 | int num = 0; | |
313 | ||
314 | while (num < DVB_MAX_ADAPTERS) { | |
78e92006 JG |
315 | if (dvbdev_check_free_adapter_num(num)) |
316 | return num; | |
1da177e4 LT |
317 | num++; |
318 | } | |
319 | ||
320 | return -ENFILE; | |
321 | } | |
322 | ||
323 | ||
78e92006 JG |
324 | int dvb_register_adapter(struct dvb_adapter *adap, const char *name, |
325 | struct module *module, struct device *device, | |
326 | short *adapter_nums) | |
1da177e4 | 327 | { |
78e92006 | 328 | int i, num; |
1da177e4 | 329 | |
c2788502 | 330 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 331 | |
78e92006 JG |
332 | for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { |
333 | num = adapter_nums[i]; | |
334 | if (num >= 0 && num < DVB_MAX_ADAPTERS) { | |
335 | /* use the one the driver asked for */ | |
336 | if (dvbdev_check_free_adapter_num(num)) | |
337 | break; | |
338 | } else { | |
339 | num = dvbdev_get_free_adapter_num(); | |
340 | break; | |
341 | } | |
342 | num = -1; | |
343 | } | |
344 | ||
345 | if (num < 0) { | |
1e4baed3 | 346 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
347 | return -ENFILE; |
348 | } | |
349 | ||
1da177e4 LT |
350 | memset (adap, 0, sizeof(struct dvb_adapter)); |
351 | INIT_LIST_HEAD (&adap->device_list); | |
352 | ||
900858ec | 353 | printk(KERN_INFO "DVB: registering new adapter (%s)\n", name); |
1da177e4 | 354 | |
1da177e4 LT |
355 | adap->num = num; |
356 | adap->name = name; | |
357 | adap->module = module; | |
d09dbf92 | 358 | adap->device = device; |
59b1842d DB |
359 | adap->mfe_shared = 0; |
360 | adap->mfe_dvbdev = NULL; | |
361 | mutex_init (&adap->mfe_lock); | |
1da177e4 LT |
362 | |
363 | list_add_tail (&adap->list_head, &dvb_adapter_list); | |
364 | ||
1e4baed3 | 365 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
366 | |
367 | return num; | |
368 | } | |
369 | EXPORT_SYMBOL(dvb_register_adapter); | |
370 | ||
371 | ||
372 | int dvb_unregister_adapter(struct dvb_adapter *adap) | |
373 | { | |
c2788502 | 374 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 375 | list_del (&adap->list_head); |
1e4baed3 | 376 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
377 | return 0; |
378 | } | |
379 | EXPORT_SYMBOL(dvb_unregister_adapter); | |
380 | ||
381 | /* if the miracle happens and "generic_usercopy()" is included into | |
382 | the kernel, then this can vanish. please don't make the mistake and | |
383 | define this as video_usercopy(). this will introduce a dependecy | |
384 | to the v4l "videodev.o" module, which is unnecessary for some | |
385 | cards (ie. the budget dvb-cards don't need the v4l module...) */ | |
16ef8def | 386 | int dvb_usercopy(struct file *file, |
afd1a0c9 | 387 | unsigned int cmd, unsigned long arg, |
16ef8def | 388 | int (*func)(struct file *file, |
1da177e4 LT |
389 | unsigned int cmd, void *arg)) |
390 | { | |
afd1a0c9 MCC |
391 | char sbuf[128]; |
392 | void *mbuf = NULL; | |
393 | void *parg = NULL; | |
394 | int err = -EINVAL; | |
395 | ||
396 | /* Copy arguments into temp kernel buffer */ | |
397 | switch (_IOC_DIR(cmd)) { | |
398 | case _IOC_NONE: | |
1da177e4 LT |
399 | /* |
400 | * For this command, the pointer is actually an integer | |
401 | * argument. | |
402 | */ | |
403 | parg = (void *) arg; | |
404 | break; | |
afd1a0c9 MCC |
405 | case _IOC_READ: /* some v4l ioctls are marked wrong ... */ |
406 | case _IOC_WRITE: | |
407 | case (_IOC_WRITE | _IOC_READ): | |
408 | if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { | |
50c25fff | 409 | parg = sbuf; |
afd1a0c9 | 410 | } else { |
50c25fff MK |
411 | /* too big to allocate from stack */ |
412 | mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); | |
413 | if (NULL == mbuf) | |
414 | return -ENOMEM; | |
415 | parg = mbuf; | |
afd1a0c9 MCC |
416 | } |
417 | ||
418 | err = -EFAULT; | |
419 | if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) | |
50c25fff | 420 | goto out; |
afd1a0c9 MCC |
421 | break; |
422 | } | |
423 | ||
424 | /* call driver */ | |
16ef8def | 425 | if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) |
afd1a0c9 MCC |
426 | err = -EINVAL; |
427 | ||
428 | if (err < 0) | |
429 | goto out; | |
430 | ||
431 | /* Copy results into user buffer */ | |
432 | switch (_IOC_DIR(cmd)) | |
433 | { | |
434 | case _IOC_READ: | |
435 | case (_IOC_WRITE | _IOC_READ): | |
436 | if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) | |
50c25fff | 437 | err = -EFAULT; |
afd1a0c9 MCC |
438 | break; |
439 | } | |
1da177e4 LT |
440 | |
441 | out: | |
afd1a0c9 MCC |
442 | kfree(mbuf); |
443 | return err; | |
1da177e4 LT |
444 | } |
445 | ||
a5f4c0ce KS |
446 | static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) |
447 | { | |
448 | struct dvb_device *dvbdev = dev_get_drvdata(dev); | |
449 | ||
a5f4c0ce | 450 | add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); |
763d19bb KS |
451 | add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); |
452 | add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); | |
a5f4c0ce KS |
453 | return 0; |
454 | } | |
455 | ||
e454cea2 | 456 | static char *dvb_devnode(struct device *dev, mode_t *mode) |
8a8bdcc7 KS |
457 | { |
458 | struct dvb_device *dvbdev = dev_get_drvdata(dev); | |
459 | ||
460 | return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", | |
461 | dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); | |
462 | } | |
463 | ||
464 | ||
1da177e4 LT |
465 | static int __init init_dvbdev(void) |
466 | { | |
467 | int retval; | |
468 | dev_t dev = MKDEV(DVB_MAJOR, 0); | |
469 | ||
470 | if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { | |
900858ec | 471 | printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR); |
1da177e4 LT |
472 | return retval; |
473 | } | |
474 | ||
475 | cdev_init(&dvb_device_cdev, &dvb_device_fops); | |
476 | if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { | |
900858ec | 477 | printk(KERN_ERR "dvb-core: unable register character device\n"); |
1da177e4 LT |
478 | goto error; |
479 | } | |
480 | ||
56b22935 | 481 | dvb_class = class_create(THIS_MODULE, "dvb"); |
1da177e4 LT |
482 | if (IS_ERR(dvb_class)) { |
483 | retval = PTR_ERR(dvb_class); | |
484 | goto error; | |
485 | } | |
a5f4c0ce | 486 | dvb_class->dev_uevent = dvb_uevent; |
e454cea2 | 487 | dvb_class->devnode = dvb_devnode; |
1da177e4 LT |
488 | return 0; |
489 | ||
490 | error: | |
491 | cdev_del(&dvb_device_cdev); | |
492 | unregister_chrdev_region(dev, MAX_DVB_MINORS); | |
493 | return retval; | |
494 | } | |
495 | ||
496 | ||
497 | static void __exit exit_dvbdev(void) | |
498 | { | |
56b22935 | 499 | class_destroy(dvb_class); |
1da177e4 | 500 | cdev_del(&dvb_device_cdev); |
afd1a0c9 | 501 | unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); |
1da177e4 LT |
502 | } |
503 | ||
4abdcf93 | 504 | subsys_initcall(init_dvbdev); |
1da177e4 LT |
505 | module_exit(exit_dvbdev); |
506 | ||
507 | MODULE_DESCRIPTION("DVB Core Driver"); | |
508 | MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); | |
509 | MODULE_LICENSE("GPL"); |