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Commit | Line | Data |
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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; | |
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); |
72024f1e | 94 | mutex_unlock(&dvbdev_mutex); |
afd1a0c9 | 95 | return err; |
1da177e4 | 96 | } |
f41ced8f | 97 | fail: |
5dd3f307 | 98 | up_read(&minor_rwsem); |
72024f1e | 99 | mutex_unlock(&dvbdev_mutex); |
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; |
1da177e4 | 162 | |
afd1a0c9 MCC |
163 | if (!dvbdev) |
164 | return -ENODEV; | |
1da177e4 LT |
165 | |
166 | if (!dvbdev->kernel_ioctl) | |
167 | return -EINVAL; | |
168 | ||
72024f1e | 169 | return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); |
1da177e4 LT |
170 | } |
171 | EXPORT_SYMBOL(dvb_generic_ioctl); | |
172 | ||
173 | ||
174 | static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) | |
175 | { | |
176 | u32 id = 0; | |
177 | ||
178 | while (id < DVB_MAX_IDS) { | |
79482619 TP |
179 | struct dvb_device *dev; |
180 | list_for_each_entry(dev, &adap->device_list, list_head) | |
1da177e4 LT |
181 | if (dev->type == type && dev->id == id) |
182 | goto skip; | |
1da177e4 LT |
183 | return id; |
184 | skip: | |
185 | id++; | |
186 | } | |
187 | return -ENFILE; | |
188 | } | |
189 | ||
190 | ||
191 | int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, | |
192 | const struct dvb_device *template, void *priv, int type) | |
193 | { | |
194 | struct dvb_device *dvbdev; | |
b6190102 | 195 | struct file_operations *dvbdevfops; |
5f553388 | 196 | struct device *clsdev; |
5dd3f307 | 197 | int minor; |
1da177e4 LT |
198 | int id; |
199 | ||
c2788502 | 200 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 201 | |
b6190102 | 202 | if ((id = dvbdev_get_free_id (adap, type)) < 0){ |
1e4baed3 | 203 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 | 204 | *pdvbdev = NULL; |
46b4f7c1 | 205 | printk(KERN_ERR "%s: couldn't find free device id\n", __func__); |
1da177e4 LT |
206 | return -ENFILE; |
207 | } | |
208 | ||
209 | *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); | |
210 | ||
b6190102 MS |
211 | if (!dvbdev){ |
212 | mutex_unlock(&dvbdev_register_lock); | |
213 | return -ENOMEM; | |
214 | } | |
215 | ||
216 | dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); | |
217 | ||
218 | if (!dvbdevfops){ | |
219 | kfree (dvbdev); | |
1e4baed3 | 220 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
221 | return -ENOMEM; |
222 | } | |
223 | ||
1da177e4 LT |
224 | memcpy(dvbdev, template, sizeof(struct dvb_device)); |
225 | dvbdev->type = type; | |
226 | dvbdev->id = id; | |
227 | dvbdev->adapter = adap; | |
228 | dvbdev->priv = priv; | |
b6190102 | 229 | dvbdev->fops = dvbdevfops; |
ca5be9cd | 230 | init_waitqueue_head (&dvbdev->wait_queue); |
1da177e4 | 231 | |
784e29d2 JE |
232 | memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); |
233 | dvbdevfops->owner = adap->module; | |
1da177e4 LT |
234 | |
235 | list_add_tail (&dvbdev->list_head, &adap->device_list); | |
236 | ||
5dd3f307 AO |
237 | down_write(&minor_rwsem); |
238 | #ifdef CONFIG_DVB_DYNAMIC_MINORS | |
239 | for (minor = 0; minor < MAX_DVB_MINORS; minor++) | |
240 | if (dvb_minors[minor] == NULL) | |
241 | break; | |
242 | ||
243 | if (minor == MAX_DVB_MINORS) { | |
244 | kfree(dvbdevfops); | |
245 | kfree(dvbdev); | |
82163edc | 246 | up_write(&minor_rwsem); |
5dd3f307 AO |
247 | mutex_unlock(&dvbdev_register_lock); |
248 | return -EINVAL; | |
249 | } | |
250 | #else | |
251 | minor = nums2minor(adap->num, type, id); | |
252 | #endif | |
253 | ||
254 | dvbdev->minor = minor; | |
255 | dvb_minors[minor] = dvbdev; | |
256 | up_write(&minor_rwsem); | |
257 | ||
f47f4763 AQ |
258 | mutex_unlock(&dvbdev_register_lock); |
259 | ||
a9b12619 | 260 | clsdev = device_create(dvb_class, adap->device, |
b7496780 | 261 | MKDEV(DVB_MAJOR, minor), |
a5f4c0ce | 262 | dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); |
4abdcf93 SA |
263 | if (IS_ERR(clsdev)) { |
264 | printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n", | |
46b4f7c1 | 265 | __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); |
4abdcf93 SA |
266 | return PTR_ERR(clsdev); |
267 | } | |
1da177e4 | 268 | |
900858ec | 269 | dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", |
5dd3f307 | 270 | adap->num, dnames[type], id, minor, minor); |
1da177e4 LT |
271 | |
272 | return 0; | |
273 | } | |
274 | EXPORT_SYMBOL(dvb_register_device); | |
275 | ||
276 | ||
277 | void dvb_unregister_device(struct dvb_device *dvbdev) | |
278 | { | |
279 | if (!dvbdev) | |
280 | return; | |
281 | ||
5dd3f307 AO |
282 | down_write(&minor_rwsem); |
283 | dvb_minors[dvbdev->minor] = NULL; | |
284 | up_write(&minor_rwsem); | |
285 | ||
286 | device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); | |
1da177e4 LT |
287 | |
288 | list_del (&dvbdev->list_head); | |
b6190102 | 289 | kfree (dvbdev->fops); |
1da177e4 LT |
290 | kfree (dvbdev); |
291 | } | |
292 | EXPORT_SYMBOL(dvb_unregister_device); | |
293 | ||
78e92006 JG |
294 | static int dvbdev_check_free_adapter_num(int num) |
295 | { | |
296 | struct list_head *entry; | |
297 | list_for_each(entry, &dvb_adapter_list) { | |
298 | struct dvb_adapter *adap; | |
299 | adap = list_entry(entry, struct dvb_adapter, list_head); | |
300 | if (adap->num == num) | |
301 | return 0; | |
302 | } | |
303 | return 1; | |
304 | } | |
1da177e4 LT |
305 | |
306 | static int dvbdev_get_free_adapter_num (void) | |
307 | { | |
308 | int num = 0; | |
309 | ||
310 | while (num < DVB_MAX_ADAPTERS) { | |
78e92006 JG |
311 | if (dvbdev_check_free_adapter_num(num)) |
312 | return num; | |
1da177e4 LT |
313 | num++; |
314 | } | |
315 | ||
316 | return -ENFILE; | |
317 | } | |
318 | ||
319 | ||
78e92006 JG |
320 | int dvb_register_adapter(struct dvb_adapter *adap, const char *name, |
321 | struct module *module, struct device *device, | |
322 | short *adapter_nums) | |
1da177e4 | 323 | { |
78e92006 | 324 | int i, num; |
1da177e4 | 325 | |
c2788502 | 326 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 327 | |
78e92006 JG |
328 | for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { |
329 | num = adapter_nums[i]; | |
330 | if (num >= 0 && num < DVB_MAX_ADAPTERS) { | |
331 | /* use the one the driver asked for */ | |
332 | if (dvbdev_check_free_adapter_num(num)) | |
333 | break; | |
334 | } else { | |
335 | num = dvbdev_get_free_adapter_num(); | |
336 | break; | |
337 | } | |
338 | num = -1; | |
339 | } | |
340 | ||
341 | if (num < 0) { | |
1e4baed3 | 342 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
343 | return -ENFILE; |
344 | } | |
345 | ||
1da177e4 LT |
346 | memset (adap, 0, sizeof(struct dvb_adapter)); |
347 | INIT_LIST_HEAD (&adap->device_list); | |
348 | ||
900858ec | 349 | printk(KERN_INFO "DVB: registering new adapter (%s)\n", name); |
1da177e4 | 350 | |
1da177e4 LT |
351 | adap->num = num; |
352 | adap->name = name; | |
353 | adap->module = module; | |
d09dbf92 | 354 | adap->device = device; |
59b1842d DB |
355 | adap->mfe_shared = 0; |
356 | adap->mfe_dvbdev = NULL; | |
357 | mutex_init (&adap->mfe_lock); | |
1da177e4 LT |
358 | |
359 | list_add_tail (&adap->list_head, &dvb_adapter_list); | |
360 | ||
1e4baed3 | 361 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
362 | |
363 | return num; | |
364 | } | |
365 | EXPORT_SYMBOL(dvb_register_adapter); | |
366 | ||
367 | ||
368 | int dvb_unregister_adapter(struct dvb_adapter *adap) | |
369 | { | |
c2788502 | 370 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 371 | list_del (&adap->list_head); |
1e4baed3 | 372 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
373 | return 0; |
374 | } | |
375 | EXPORT_SYMBOL(dvb_unregister_adapter); | |
376 | ||
377 | /* if the miracle happens and "generic_usercopy()" is included into | |
378 | the kernel, then this can vanish. please don't make the mistake and | |
379 | define this as video_usercopy(). this will introduce a dependecy | |
380 | to the v4l "videodev.o" module, which is unnecessary for some | |
381 | cards (ie. the budget dvb-cards don't need the v4l module...) */ | |
16ef8def | 382 | int dvb_usercopy(struct file *file, |
afd1a0c9 | 383 | unsigned int cmd, unsigned long arg, |
16ef8def | 384 | int (*func)(struct file *file, |
1da177e4 LT |
385 | unsigned int cmd, void *arg)) |
386 | { | |
afd1a0c9 MCC |
387 | char sbuf[128]; |
388 | void *mbuf = NULL; | |
389 | void *parg = NULL; | |
390 | int err = -EINVAL; | |
391 | ||
392 | /* Copy arguments into temp kernel buffer */ | |
393 | switch (_IOC_DIR(cmd)) { | |
394 | case _IOC_NONE: | |
1da177e4 LT |
395 | /* |
396 | * For this command, the pointer is actually an integer | |
397 | * argument. | |
398 | */ | |
399 | parg = (void *) arg; | |
400 | break; | |
afd1a0c9 MCC |
401 | case _IOC_READ: /* some v4l ioctls are marked wrong ... */ |
402 | case _IOC_WRITE: | |
403 | case (_IOC_WRITE | _IOC_READ): | |
404 | if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { | |
50c25fff | 405 | parg = sbuf; |
afd1a0c9 | 406 | } else { |
50c25fff MK |
407 | /* too big to allocate from stack */ |
408 | mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); | |
409 | if (NULL == mbuf) | |
410 | return -ENOMEM; | |
411 | parg = mbuf; | |
afd1a0c9 MCC |
412 | } |
413 | ||
414 | err = -EFAULT; | |
415 | if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) | |
50c25fff | 416 | goto out; |
afd1a0c9 MCC |
417 | break; |
418 | } | |
419 | ||
420 | /* call driver */ | |
16ef8def | 421 | if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) |
d9751fd0 | 422 | err = -ENOTTY; |
afd1a0c9 MCC |
423 | |
424 | if (err < 0) | |
425 | goto out; | |
426 | ||
427 | /* Copy results into user buffer */ | |
428 | switch (_IOC_DIR(cmd)) | |
429 | { | |
430 | case _IOC_READ: | |
431 | case (_IOC_WRITE | _IOC_READ): | |
432 | if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) | |
50c25fff | 433 | err = -EFAULT; |
afd1a0c9 MCC |
434 | break; |
435 | } | |
1da177e4 LT |
436 | |
437 | out: | |
afd1a0c9 MCC |
438 | kfree(mbuf); |
439 | return err; | |
1da177e4 LT |
440 | } |
441 | ||
a5f4c0ce KS |
442 | static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) |
443 | { | |
444 | struct dvb_device *dvbdev = dev_get_drvdata(dev); | |
445 | ||
a5f4c0ce | 446 | add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); |
763d19bb KS |
447 | add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); |
448 | add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); | |
a5f4c0ce KS |
449 | return 0; |
450 | } | |
451 | ||
2c9ede55 | 452 | static char *dvb_devnode(struct device *dev, umode_t *mode) |
8a8bdcc7 KS |
453 | { |
454 | struct dvb_device *dvbdev = dev_get_drvdata(dev); | |
455 | ||
456 | return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", | |
457 | dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); | |
458 | } | |
459 | ||
460 | ||
1da177e4 LT |
461 | static int __init init_dvbdev(void) |
462 | { | |
463 | int retval; | |
464 | dev_t dev = MKDEV(DVB_MAJOR, 0); | |
465 | ||
466 | if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { | |
900858ec | 467 | printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR); |
1da177e4 LT |
468 | return retval; |
469 | } | |
470 | ||
471 | cdev_init(&dvb_device_cdev, &dvb_device_fops); | |
472 | if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { | |
900858ec | 473 | printk(KERN_ERR "dvb-core: unable register character device\n"); |
1da177e4 LT |
474 | goto error; |
475 | } | |
476 | ||
56b22935 | 477 | dvb_class = class_create(THIS_MODULE, "dvb"); |
1da177e4 LT |
478 | if (IS_ERR(dvb_class)) { |
479 | retval = PTR_ERR(dvb_class); | |
480 | goto error; | |
481 | } | |
a5f4c0ce | 482 | dvb_class->dev_uevent = dvb_uevent; |
e454cea2 | 483 | dvb_class->devnode = dvb_devnode; |
1da177e4 LT |
484 | return 0; |
485 | ||
486 | error: | |
487 | cdev_del(&dvb_device_cdev); | |
488 | unregister_chrdev_region(dev, MAX_DVB_MINORS); | |
489 | return retval; | |
490 | } | |
491 | ||
492 | ||
493 | static void __exit exit_dvbdev(void) | |
494 | { | |
56b22935 | 495 | class_destroy(dvb_class); |
1da177e4 | 496 | cdev_del(&dvb_device_cdev); |
afd1a0c9 | 497 | unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); |
1da177e4 LT |
498 | } |
499 | ||
4abdcf93 | 500 | subsys_initcall(init_dvbdev); |
1da177e4 LT |
501 | module_exit(exit_dvbdev); |
502 | ||
503 | MODULE_DESCRIPTION("DVB Core Driver"); | |
504 | MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); | |
505 | MODULE_LICENSE("GPL"); |