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 | ||
1da177e4 LT |
53 | #define DVB_MAX_IDS 4 |
54 | #define nums2minor(num,type,id) ((num << 6) | (id << 4) | type) | |
55 | #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64) | |
56 | ||
56b22935 | 57 | static struct class *dvb_class; |
1da177e4 LT |
58 | |
59 | static struct dvb_device* dvbdev_find_device (int minor) | |
60 | { | |
79482619 | 61 | struct dvb_adapter *adap; |
1da177e4 | 62 | |
79482619 TP |
63 | list_for_each_entry(adap, &dvb_adapter_list, list_head) { |
64 | struct dvb_device *dev; | |
65 | list_for_each_entry(dev, &adap->device_list, list_head) | |
1da177e4 LT |
66 | if (nums2minor(adap->num, dev->type, dev->id) == minor) |
67 | return dev; | |
1da177e4 LT |
68 | } |
69 | ||
70 | return NULL; | |
71 | } | |
72 | ||
73 | ||
74 | static int dvb_device_open(struct inode *inode, struct file *file) | |
75 | { | |
76 | struct dvb_device *dvbdev; | |
77 | ||
5794e1b1 | 78 | lock_kernel(); |
1da177e4 LT |
79 | dvbdev = dvbdev_find_device (iminor(inode)); |
80 | ||
81 | if (dvbdev && dvbdev->fops) { | |
82 | int err = 0; | |
99ac48f5 | 83 | const struct file_operations *old_fops; |
1da177e4 LT |
84 | |
85 | file->private_data = dvbdev; | |
86 | old_fops = file->f_op; | |
afd1a0c9 MCC |
87 | file->f_op = fops_get(dvbdev->fops); |
88 | if(file->f_op->open) | |
50c25fff | 89 | err = file->f_op->open(inode,file); |
afd1a0c9 | 90 | if (err) { |
50c25fff MK |
91 | fops_put(file->f_op); |
92 | file->f_op = fops_get(old_fops); | |
afd1a0c9 MCC |
93 | } |
94 | fops_put(old_fops); | |
5794e1b1 | 95 | unlock_kernel(); |
afd1a0c9 | 96 | return err; |
1da177e4 | 97 | } |
5794e1b1 | 98 | unlock_kernel(); |
1da177e4 LT |
99 | return -ENODEV; |
100 | } | |
101 | ||
102 | ||
27a643b1 | 103 | static const struct file_operations dvb_device_fops = |
1da177e4 LT |
104 | { |
105 | .owner = THIS_MODULE, | |
106 | .open = dvb_device_open, | |
107 | }; | |
108 | ||
7e7654a9 | 109 | static struct cdev dvb_device_cdev; |
1da177e4 LT |
110 | |
111 | int dvb_generic_open(struct inode *inode, struct file *file) | |
112 | { | |
afd1a0c9 | 113 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 | 114 | |
afd1a0c9 MCC |
115 | if (!dvbdev) |
116 | return -ENODEV; | |
1da177e4 LT |
117 | |
118 | if (!dvbdev->users) | |
afd1a0c9 | 119 | return -EBUSY; |
1da177e4 LT |
120 | |
121 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
afd1a0c9 MCC |
122 | if (!dvbdev->readers) |
123 | return -EBUSY; | |
1da177e4 LT |
124 | dvbdev->readers--; |
125 | } else { | |
afd1a0c9 MCC |
126 | if (!dvbdev->writers) |
127 | return -EBUSY; | |
1da177e4 LT |
128 | dvbdev->writers--; |
129 | } | |
130 | ||
131 | dvbdev->users--; | |
132 | return 0; | |
133 | } | |
134 | EXPORT_SYMBOL(dvb_generic_open); | |
135 | ||
136 | ||
137 | int dvb_generic_release(struct inode *inode, struct file *file) | |
138 | { | |
afd1a0c9 | 139 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 LT |
140 | |
141 | if (!dvbdev) | |
afd1a0c9 | 142 | return -ENODEV; |
1da177e4 LT |
143 | |
144 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
145 | dvbdev->readers++; | |
146 | } else { | |
147 | dvbdev->writers++; | |
148 | } | |
149 | ||
150 | dvbdev->users++; | |
151 | return 0; | |
152 | } | |
153 | EXPORT_SYMBOL(dvb_generic_release); | |
154 | ||
155 | ||
156 | int dvb_generic_ioctl(struct inode *inode, struct file *file, | |
157 | unsigned int cmd, unsigned long arg) | |
158 | { | |
afd1a0c9 | 159 | struct dvb_device *dvbdev = file->private_data; |
1da177e4 | 160 | |
afd1a0c9 MCC |
161 | if (!dvbdev) |
162 | return -ENODEV; | |
1da177e4 LT |
163 | |
164 | if (!dvbdev->kernel_ioctl) | |
165 | return -EINVAL; | |
166 | ||
167 | return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl); | |
168 | } | |
169 | EXPORT_SYMBOL(dvb_generic_ioctl); | |
170 | ||
171 | ||
172 | static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) | |
173 | { | |
174 | u32 id = 0; | |
175 | ||
176 | while (id < DVB_MAX_IDS) { | |
79482619 TP |
177 | struct dvb_device *dev; |
178 | list_for_each_entry(dev, &adap->device_list, list_head) | |
1da177e4 LT |
179 | if (dev->type == type && dev->id == id) |
180 | goto skip; | |
1da177e4 LT |
181 | return id; |
182 | skip: | |
183 | id++; | |
184 | } | |
185 | return -ENFILE; | |
186 | } | |
187 | ||
188 | ||
189 | int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, | |
190 | const struct dvb_device *template, void *priv, int type) | |
191 | { | |
192 | struct dvb_device *dvbdev; | |
b6190102 | 193 | struct file_operations *dvbdevfops; |
5f553388 | 194 | struct device *clsdev; |
1da177e4 LT |
195 | int id; |
196 | ||
c2788502 | 197 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 198 | |
b6190102 | 199 | if ((id = dvbdev_get_free_id (adap, type)) < 0){ |
1e4baed3 | 200 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 | 201 | *pdvbdev = NULL; |
46b4f7c1 | 202 | printk(KERN_ERR "%s: couldn't find free device id\n", __func__); |
1da177e4 LT |
203 | return -ENFILE; |
204 | } | |
205 | ||
206 | *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); | |
207 | ||
b6190102 MS |
208 | if (!dvbdev){ |
209 | mutex_unlock(&dvbdev_register_lock); | |
210 | return -ENOMEM; | |
211 | } | |
212 | ||
213 | dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); | |
214 | ||
215 | if (!dvbdevfops){ | |
216 | kfree (dvbdev); | |
1e4baed3 | 217 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
218 | return -ENOMEM; |
219 | } | |
220 | ||
1da177e4 LT |
221 | memcpy(dvbdev, template, sizeof(struct dvb_device)); |
222 | dvbdev->type = type; | |
223 | dvbdev->id = id; | |
224 | dvbdev->adapter = adap; | |
225 | dvbdev->priv = priv; | |
b6190102 | 226 | dvbdev->fops = dvbdevfops; |
ca5be9cd | 227 | init_waitqueue_head (&dvbdev->wait_queue); |
1da177e4 | 228 | |
b6190102 | 229 | memcpy(dvbdev->fops, template->fops, sizeof(struct file_operations)); |
1da177e4 LT |
230 | dvbdev->fops->owner = adap->module; |
231 | ||
232 | list_add_tail (&dvbdev->list_head, &adap->device_list); | |
233 | ||
f47f4763 AQ |
234 | mutex_unlock(&dvbdev_register_lock); |
235 | ||
a9b12619 | 236 | clsdev = device_create(dvb_class, adap->device, |
5f553388 | 237 | MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)), |
e282959e | 238 | NULL, "dvb%d.%s%d", adap->num, dnames[type], id); |
4abdcf93 SA |
239 | if (IS_ERR(clsdev)) { |
240 | printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n", | |
46b4f7c1 | 241 | __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); |
4abdcf93 SA |
242 | return PTR_ERR(clsdev); |
243 | } | |
1da177e4 | 244 | |
900858ec | 245 | dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", |
1da177e4 LT |
246 | adap->num, dnames[type], id, nums2minor(adap->num, type, id), |
247 | nums2minor(adap->num, type, id)); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | EXPORT_SYMBOL(dvb_register_device); | |
252 | ||
253 | ||
254 | void dvb_unregister_device(struct dvb_device *dvbdev) | |
255 | { | |
256 | if (!dvbdev) | |
257 | return; | |
258 | ||
5f553388 KS |
259 | device_destroy(dvb_class, MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num, |
260 | dvbdev->type, dvbdev->id))); | |
1da177e4 LT |
261 | |
262 | list_del (&dvbdev->list_head); | |
b6190102 | 263 | kfree (dvbdev->fops); |
1da177e4 LT |
264 | kfree (dvbdev); |
265 | } | |
266 | EXPORT_SYMBOL(dvb_unregister_device); | |
267 | ||
78e92006 JG |
268 | static int dvbdev_check_free_adapter_num(int num) |
269 | { | |
270 | struct list_head *entry; | |
271 | list_for_each(entry, &dvb_adapter_list) { | |
272 | struct dvb_adapter *adap; | |
273 | adap = list_entry(entry, struct dvb_adapter, list_head); | |
274 | if (adap->num == num) | |
275 | return 0; | |
276 | } | |
277 | return 1; | |
278 | } | |
1da177e4 LT |
279 | |
280 | static int dvbdev_get_free_adapter_num (void) | |
281 | { | |
282 | int num = 0; | |
283 | ||
284 | while (num < DVB_MAX_ADAPTERS) { | |
78e92006 JG |
285 | if (dvbdev_check_free_adapter_num(num)) |
286 | return num; | |
1da177e4 LT |
287 | num++; |
288 | } | |
289 | ||
290 | return -ENFILE; | |
291 | } | |
292 | ||
293 | ||
78e92006 JG |
294 | int dvb_register_adapter(struct dvb_adapter *adap, const char *name, |
295 | struct module *module, struct device *device, | |
296 | short *adapter_nums) | |
1da177e4 | 297 | { |
78e92006 | 298 | int i, num; |
1da177e4 | 299 | |
c2788502 | 300 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 301 | |
78e92006 JG |
302 | for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { |
303 | num = adapter_nums[i]; | |
304 | if (num >= 0 && num < DVB_MAX_ADAPTERS) { | |
305 | /* use the one the driver asked for */ | |
306 | if (dvbdev_check_free_adapter_num(num)) | |
307 | break; | |
308 | } else { | |
309 | num = dvbdev_get_free_adapter_num(); | |
310 | break; | |
311 | } | |
312 | num = -1; | |
313 | } | |
314 | ||
315 | if (num < 0) { | |
1e4baed3 | 316 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
317 | return -ENFILE; |
318 | } | |
319 | ||
1da177e4 LT |
320 | memset (adap, 0, sizeof(struct dvb_adapter)); |
321 | INIT_LIST_HEAD (&adap->device_list); | |
322 | ||
900858ec | 323 | printk(KERN_INFO "DVB: registering new adapter (%s)\n", name); |
1da177e4 | 324 | |
1da177e4 LT |
325 | adap->num = num; |
326 | adap->name = name; | |
327 | adap->module = module; | |
d09dbf92 | 328 | adap->device = device; |
1da177e4 LT |
329 | |
330 | list_add_tail (&adap->list_head, &dvb_adapter_list); | |
331 | ||
1e4baed3 | 332 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
333 | |
334 | return num; | |
335 | } | |
336 | EXPORT_SYMBOL(dvb_register_adapter); | |
337 | ||
338 | ||
339 | int dvb_unregister_adapter(struct dvb_adapter *adap) | |
340 | { | |
c2788502 | 341 | mutex_lock(&dvbdev_register_lock); |
1da177e4 | 342 | list_del (&adap->list_head); |
1e4baed3 | 343 | mutex_unlock(&dvbdev_register_lock); |
1da177e4 LT |
344 | return 0; |
345 | } | |
346 | EXPORT_SYMBOL(dvb_unregister_adapter); | |
347 | ||
348 | /* if the miracle happens and "generic_usercopy()" is included into | |
349 | the kernel, then this can vanish. please don't make the mistake and | |
350 | define this as video_usercopy(). this will introduce a dependecy | |
351 | to the v4l "videodev.o" module, which is unnecessary for some | |
352 | cards (ie. the budget dvb-cards don't need the v4l module...) */ | |
353 | int dvb_usercopy(struct inode *inode, struct file *file, | |
afd1a0c9 | 354 | unsigned int cmd, unsigned long arg, |
1da177e4 LT |
355 | int (*func)(struct inode *inode, struct file *file, |
356 | unsigned int cmd, void *arg)) | |
357 | { | |
afd1a0c9 MCC |
358 | char sbuf[128]; |
359 | void *mbuf = NULL; | |
360 | void *parg = NULL; | |
361 | int err = -EINVAL; | |
362 | ||
363 | /* Copy arguments into temp kernel buffer */ | |
364 | switch (_IOC_DIR(cmd)) { | |
365 | case _IOC_NONE: | |
1da177e4 LT |
366 | /* |
367 | * For this command, the pointer is actually an integer | |
368 | * argument. | |
369 | */ | |
370 | parg = (void *) arg; | |
371 | break; | |
afd1a0c9 MCC |
372 | case _IOC_READ: /* some v4l ioctls are marked wrong ... */ |
373 | case _IOC_WRITE: | |
374 | case (_IOC_WRITE | _IOC_READ): | |
375 | if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { | |
50c25fff | 376 | parg = sbuf; |
afd1a0c9 | 377 | } else { |
50c25fff MK |
378 | /* too big to allocate from stack */ |
379 | mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); | |
380 | if (NULL == mbuf) | |
381 | return -ENOMEM; | |
382 | parg = mbuf; | |
afd1a0c9 MCC |
383 | } |
384 | ||
385 | err = -EFAULT; | |
386 | if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) | |
50c25fff | 387 | goto out; |
afd1a0c9 MCC |
388 | break; |
389 | } | |
390 | ||
391 | /* call driver */ | |
392 | if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD) | |
393 | err = -EINVAL; | |
394 | ||
395 | if (err < 0) | |
396 | goto out; | |
397 | ||
398 | /* Copy results into user buffer */ | |
399 | switch (_IOC_DIR(cmd)) | |
400 | { | |
401 | case _IOC_READ: | |
402 | case (_IOC_WRITE | _IOC_READ): | |
403 | if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) | |
50c25fff | 404 | err = -EFAULT; |
afd1a0c9 MCC |
405 | break; |
406 | } | |
1da177e4 LT |
407 | |
408 | out: | |
afd1a0c9 MCC |
409 | kfree(mbuf); |
410 | return err; | |
1da177e4 LT |
411 | } |
412 | ||
413 | static int __init init_dvbdev(void) | |
414 | { | |
415 | int retval; | |
416 | dev_t dev = MKDEV(DVB_MAJOR, 0); | |
417 | ||
418 | if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { | |
900858ec | 419 | printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR); |
1da177e4 LT |
420 | return retval; |
421 | } | |
422 | ||
423 | cdev_init(&dvb_device_cdev, &dvb_device_fops); | |
424 | if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { | |
900858ec | 425 | printk(KERN_ERR "dvb-core: unable register character device\n"); |
1da177e4 LT |
426 | goto error; |
427 | } | |
428 | ||
56b22935 | 429 | dvb_class = class_create(THIS_MODULE, "dvb"); |
1da177e4 LT |
430 | if (IS_ERR(dvb_class)) { |
431 | retval = PTR_ERR(dvb_class); | |
432 | goto error; | |
433 | } | |
434 | return 0; | |
435 | ||
436 | error: | |
437 | cdev_del(&dvb_device_cdev); | |
438 | unregister_chrdev_region(dev, MAX_DVB_MINORS); | |
439 | return retval; | |
440 | } | |
441 | ||
442 | ||
443 | static void __exit exit_dvbdev(void) | |
444 | { | |
56b22935 | 445 | class_destroy(dvb_class); |
1da177e4 | 446 | cdev_del(&dvb_device_cdev); |
afd1a0c9 | 447 | unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); |
1da177e4 LT |
448 | } |
449 | ||
4abdcf93 | 450 | subsys_initcall(init_dvbdev); |
1da177e4 LT |
451 | module_exit(exit_dvbdev); |
452 | ||
453 | MODULE_DESCRIPTION("DVB Core Driver"); | |
454 | MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); | |
455 | MODULE_LICENSE("GPL"); |