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> | |
28 | #include <linux/moduleparam.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/device.h> | |
34 | #include <linux/fs.h> | |
35 | #include <linux/cdev.h> | |
36 | ||
37 | #include "dvbdev.h" | |
38 | ||
39 | static int dvbdev_debug; | |
40 | ||
41 | module_param(dvbdev_debug, int, 0644); | |
42 | MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); | |
43 | ||
44 | #define dprintk if (dvbdev_debug) printk | |
45 | ||
46 | static LIST_HEAD(dvb_adapter_list); | |
47 | static DECLARE_MUTEX(dvbdev_register_lock); | |
48 | ||
49 | static const char * const dnames[] = { | |
50 | "video", "audio", "sec", "frontend", "demux", "dvr", "ca", | |
51 | "net", "osd" | |
52 | }; | |
53 | ||
54 | #define DVB_MAX_ADAPTERS 8 | |
55 | #define DVB_MAX_IDS 4 | |
56 | #define nums2minor(num,type,id) ((num << 6) | (id << 4) | type) | |
57 | #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64) | |
58 | ||
56b22935 | 59 | static struct class *dvb_class; |
1da177e4 LT |
60 | |
61 | static struct dvb_device* dvbdev_find_device (int minor) | |
62 | { | |
63 | struct list_head *entry; | |
64 | ||
65 | list_for_each (entry, &dvb_adapter_list) { | |
66 | struct list_head *entry0; | |
67 | struct dvb_adapter *adap; | |
68 | adap = list_entry (entry, struct dvb_adapter, list_head); | |
69 | list_for_each (entry0, &adap->device_list) { | |
70 | struct dvb_device *dev; | |
71 | dev = list_entry (entry0, struct dvb_device, list_head); | |
72 | if (nums2minor(adap->num, dev->type, dev->id) == minor) | |
73 | return dev; | |
74 | } | |
75 | } | |
76 | ||
77 | return NULL; | |
78 | } | |
79 | ||
80 | ||
81 | static int dvb_device_open(struct inode *inode, struct file *file) | |
82 | { | |
83 | struct dvb_device *dvbdev; | |
84 | ||
85 | dvbdev = dvbdev_find_device (iminor(inode)); | |
86 | ||
87 | if (dvbdev && dvbdev->fops) { | |
88 | int err = 0; | |
89 | struct file_operations *old_fops; | |
90 | ||
91 | file->private_data = dvbdev; | |
92 | old_fops = file->f_op; | |
93 | file->f_op = fops_get(dvbdev->fops); | |
94 | if(file->f_op->open) | |
95 | err = file->f_op->open(inode,file); | |
96 | if (err) { | |
97 | fops_put(file->f_op); | |
98 | file->f_op = fops_get(old_fops); | |
99 | } | |
100 | fops_put(old_fops); | |
101 | return err; | |
102 | } | |
103 | return -ENODEV; | |
104 | } | |
105 | ||
106 | ||
107 | static struct file_operations dvb_device_fops = | |
108 | { | |
109 | .owner = THIS_MODULE, | |
110 | .open = dvb_device_open, | |
111 | }; | |
112 | ||
113 | static struct cdev dvb_device_cdev = { | |
114 | .kobj = {.name = "dvb", }, | |
115 | .owner = THIS_MODULE, | |
116 | }; | |
117 | ||
118 | int dvb_generic_open(struct inode *inode, struct file *file) | |
119 | { | |
120 | struct dvb_device *dvbdev = file->private_data; | |
121 | ||
122 | if (!dvbdev) | |
123 | return -ENODEV; | |
124 | ||
125 | if (!dvbdev->users) | |
126 | return -EBUSY; | |
127 | ||
128 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
129 | if (!dvbdev->readers) | |
130 | return -EBUSY; | |
131 | dvbdev->readers--; | |
132 | } else { | |
133 | if (!dvbdev->writers) | |
134 | return -EBUSY; | |
135 | dvbdev->writers--; | |
136 | } | |
137 | ||
138 | dvbdev->users--; | |
139 | return 0; | |
140 | } | |
141 | EXPORT_SYMBOL(dvb_generic_open); | |
142 | ||
143 | ||
144 | int dvb_generic_release(struct inode *inode, struct file *file) | |
145 | { | |
146 | struct dvb_device *dvbdev = file->private_data; | |
147 | ||
148 | if (!dvbdev) | |
149 | return -ENODEV; | |
150 | ||
151 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
152 | dvbdev->readers++; | |
153 | } else { | |
154 | dvbdev->writers++; | |
155 | } | |
156 | ||
157 | dvbdev->users++; | |
158 | return 0; | |
159 | } | |
160 | EXPORT_SYMBOL(dvb_generic_release); | |
161 | ||
162 | ||
163 | int dvb_generic_ioctl(struct inode *inode, struct file *file, | |
164 | unsigned int cmd, unsigned long arg) | |
165 | { | |
166 | struct dvb_device *dvbdev = file->private_data; | |
167 | ||
168 | if (!dvbdev) | |
169 | return -ENODEV; | |
170 | ||
171 | if (!dvbdev->kernel_ioctl) | |
172 | return -EINVAL; | |
173 | ||
174 | return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl); | |
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) { | |
184 | struct list_head *entry; | |
185 | list_for_each (entry, &adap->device_list) { | |
186 | struct dvb_device *dev; | |
187 | dev = list_entry (entry, struct dvb_device, list_head); | |
188 | if (dev->type == type && dev->id == id) | |
189 | goto skip; | |
190 | } | |
191 | return id; | |
192 | skip: | |
193 | id++; | |
194 | } | |
195 | return -ENFILE; | |
196 | } | |
197 | ||
198 | ||
199 | int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, | |
200 | const struct dvb_device *template, void *priv, int type) | |
201 | { | |
202 | struct dvb_device *dvbdev; | |
203 | int id; | |
204 | ||
205 | if (down_interruptible (&dvbdev_register_lock)) | |
206 | return -ERESTARTSYS; | |
207 | ||
208 | if ((id = dvbdev_get_free_id (adap, type)) < 0) { | |
209 | up (&dvbdev_register_lock); | |
210 | *pdvbdev = NULL; | |
211 | printk ("%s: could get find free device id...\n", __FUNCTION__); | |
212 | return -ENFILE; | |
213 | } | |
214 | ||
215 | *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); | |
216 | ||
217 | if (!dvbdev) { | |
218 | up(&dvbdev_register_lock); | |
219 | return -ENOMEM; | |
220 | } | |
221 | ||
222 | up (&dvbdev_register_lock); | |
223 | ||
224 | memcpy(dvbdev, template, sizeof(struct dvb_device)); | |
225 | dvbdev->type = type; | |
226 | dvbdev->id = id; | |
227 | dvbdev->adapter = adap; | |
228 | dvbdev->priv = priv; | |
229 | ||
230 | dvbdev->fops->owner = adap->module; | |
231 | ||
232 | list_add_tail (&dvbdev->list_head, &adap->device_list); | |
233 | ||
234 | devfs_mk_cdev(MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)), | |
235 | S_IFCHR | S_IRUSR | S_IWUSR, | |
236 | "dvb/adapter%d/%s%d", adap->num, dnames[type], id); | |
237 | ||
53f46542 | 238 | class_device_create(dvb_class, NULL, MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)), |
56b22935 | 239 | NULL, "dvb%d.%s%d", adap->num, dnames[type], id); |
1da177e4 LT |
240 | |
241 | dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", | |
242 | adap->num, dnames[type], id, nums2minor(adap->num, type, id), | |
243 | nums2minor(adap->num, type, id)); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | EXPORT_SYMBOL(dvb_register_device); | |
248 | ||
249 | ||
250 | void dvb_unregister_device(struct dvb_device *dvbdev) | |
251 | { | |
252 | if (!dvbdev) | |
253 | return; | |
254 | ||
255 | devfs_remove("dvb/adapter%d/%s%d", dvbdev->adapter->num, | |
256 | dnames[dvbdev->type], dvbdev->id); | |
257 | ||
56b22935 | 258 | class_device_destroy(dvb_class, MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num, |
1da177e4 LT |
259 | dvbdev->type, dvbdev->id))); |
260 | ||
261 | list_del (&dvbdev->list_head); | |
262 | kfree (dvbdev); | |
263 | } | |
264 | EXPORT_SYMBOL(dvb_unregister_device); | |
265 | ||
266 | ||
267 | static int dvbdev_get_free_adapter_num (void) | |
268 | { | |
269 | int num = 0; | |
270 | ||
271 | while (num < DVB_MAX_ADAPTERS) { | |
272 | struct list_head *entry; | |
273 | list_for_each (entry, &dvb_adapter_list) { | |
274 | struct dvb_adapter *adap; | |
275 | adap = list_entry (entry, struct dvb_adapter, list_head); | |
276 | if (adap->num == num) | |
277 | goto skip; | |
278 | } | |
279 | return num; | |
280 | skip: | |
281 | num++; | |
282 | } | |
283 | ||
284 | return -ENFILE; | |
285 | } | |
286 | ||
287 | ||
fdc53a6d | 288 | int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct module *module) |
1da177e4 | 289 | { |
1da177e4 LT |
290 | int num; |
291 | ||
292 | if (down_interruptible (&dvbdev_register_lock)) | |
293 | return -ERESTARTSYS; | |
294 | ||
295 | if ((num = dvbdev_get_free_adapter_num ()) < 0) { | |
296 | up (&dvbdev_register_lock); | |
297 | return -ENFILE; | |
298 | } | |
299 | ||
1da177e4 LT |
300 | memset (adap, 0, sizeof(struct dvb_adapter)); |
301 | INIT_LIST_HEAD (&adap->device_list); | |
302 | ||
303 | printk ("DVB: registering new adapter (%s).\n", name); | |
304 | ||
305 | devfs_mk_dir("dvb/adapter%d", num); | |
306 | adap->num = num; | |
307 | adap->name = name; | |
308 | adap->module = module; | |
309 | ||
310 | list_add_tail (&adap->list_head, &dvb_adapter_list); | |
311 | ||
312 | up (&dvbdev_register_lock); | |
313 | ||
314 | return num; | |
315 | } | |
316 | EXPORT_SYMBOL(dvb_register_adapter); | |
317 | ||
318 | ||
319 | int dvb_unregister_adapter(struct dvb_adapter *adap) | |
320 | { | |
321 | devfs_remove("dvb/adapter%d", adap->num); | |
322 | ||
323 | if (down_interruptible (&dvbdev_register_lock)) | |
324 | return -ERESTARTSYS; | |
325 | list_del (&adap->list_head); | |
326 | up (&dvbdev_register_lock); | |
1da177e4 LT |
327 | return 0; |
328 | } | |
329 | EXPORT_SYMBOL(dvb_unregister_adapter); | |
330 | ||
331 | /* if the miracle happens and "generic_usercopy()" is included into | |
332 | the kernel, then this can vanish. please don't make the mistake and | |
333 | define this as video_usercopy(). this will introduce a dependecy | |
334 | to the v4l "videodev.o" module, which is unnecessary for some | |
335 | cards (ie. the budget dvb-cards don't need the v4l module...) */ | |
336 | int dvb_usercopy(struct inode *inode, struct file *file, | |
337 | unsigned int cmd, unsigned long arg, | |
338 | int (*func)(struct inode *inode, struct file *file, | |
339 | unsigned int cmd, void *arg)) | |
340 | { | |
341 | char sbuf[128]; | |
342 | void *mbuf = NULL; | |
343 | void *parg = NULL; | |
344 | int err = -EINVAL; | |
345 | ||
346 | /* Copy arguments into temp kernel buffer */ | |
347 | switch (_IOC_DIR(cmd)) { | |
348 | case _IOC_NONE: | |
349 | /* | |
350 | * For this command, the pointer is actually an integer | |
351 | * argument. | |
352 | */ | |
353 | parg = (void *) arg; | |
354 | break; | |
355 | case _IOC_READ: /* some v4l ioctls are marked wrong ... */ | |
356 | case _IOC_WRITE: | |
357 | case (_IOC_WRITE | _IOC_READ): | |
358 | if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { | |
359 | parg = sbuf; | |
360 | } else { | |
361 | /* too big to allocate from stack */ | |
362 | mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); | |
363 | if (NULL == mbuf) | |
364 | return -ENOMEM; | |
365 | parg = mbuf; | |
366 | } | |
367 | ||
368 | err = -EFAULT; | |
369 | if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) | |
370 | goto out; | |
371 | break; | |
372 | } | |
373 | ||
374 | /* call driver */ | |
375 | if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD) | |
376 | err = -EINVAL; | |
377 | ||
378 | if (err < 0) | |
379 | goto out; | |
380 | ||
381 | /* Copy results into user buffer */ | |
382 | switch (_IOC_DIR(cmd)) | |
383 | { | |
384 | case _IOC_READ: | |
385 | case (_IOC_WRITE | _IOC_READ): | |
386 | if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) | |
387 | err = -EFAULT; | |
388 | break; | |
389 | } | |
390 | ||
391 | out: | |
392 | kfree(mbuf); | |
393 | return err; | |
394 | } | |
395 | ||
396 | static int __init init_dvbdev(void) | |
397 | { | |
398 | int retval; | |
399 | dev_t dev = MKDEV(DVB_MAJOR, 0); | |
400 | ||
401 | if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { | |
402 | printk("dvb-core: unable to get major %d\n", DVB_MAJOR); | |
403 | return retval; | |
404 | } | |
405 | ||
406 | cdev_init(&dvb_device_cdev, &dvb_device_fops); | |
407 | if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { | |
408 | printk("dvb-core: unable to get major %d\n", DVB_MAJOR); | |
409 | goto error; | |
410 | } | |
411 | ||
412 | devfs_mk_dir("dvb"); | |
413 | ||
56b22935 | 414 | dvb_class = class_create(THIS_MODULE, "dvb"); |
1da177e4 LT |
415 | if (IS_ERR(dvb_class)) { |
416 | retval = PTR_ERR(dvb_class); | |
417 | goto error; | |
418 | } | |
419 | return 0; | |
420 | ||
421 | error: | |
422 | cdev_del(&dvb_device_cdev); | |
423 | unregister_chrdev_region(dev, MAX_DVB_MINORS); | |
424 | return retval; | |
425 | } | |
426 | ||
427 | ||
428 | static void __exit exit_dvbdev(void) | |
429 | { | |
430 | devfs_remove("dvb"); | |
56b22935 | 431 | class_destroy(dvb_class); |
1da177e4 LT |
432 | cdev_del(&dvb_device_cdev); |
433 | unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); | |
434 | } | |
435 | ||
436 | module_init(init_dvbdev); | |
437 | module_exit(exit_dvbdev); | |
438 | ||
439 | MODULE_DESCRIPTION("DVB Core Driver"); | |
440 | MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); | |
441 | MODULE_LICENSE("GPL"); |