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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> | |
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 | ||
59 | struct class_simple *dvb_class; | |
60 | EXPORT_SYMBOL(dvb_class); | |
61 | ||
62 | static struct dvb_device* dvbdev_find_device (int minor) | |
63 | { | |
64 | struct list_head *entry; | |
65 | ||
66 | list_for_each (entry, &dvb_adapter_list) { | |
67 | struct list_head *entry0; | |
68 | struct dvb_adapter *adap; | |
69 | adap = list_entry (entry, struct dvb_adapter, list_head); | |
70 | list_for_each (entry0, &adap->device_list) { | |
71 | struct dvb_device *dev; | |
72 | dev = list_entry (entry0, struct dvb_device, list_head); | |
73 | if (nums2minor(adap->num, dev->type, dev->id) == minor) | |
74 | return dev; | |
75 | } | |
76 | } | |
77 | ||
78 | return NULL; | |
79 | } | |
80 | ||
81 | ||
82 | static int dvb_device_open(struct inode *inode, struct file *file) | |
83 | { | |
84 | struct dvb_device *dvbdev; | |
85 | ||
86 | dvbdev = dvbdev_find_device (iminor(inode)); | |
87 | ||
88 | if (dvbdev && dvbdev->fops) { | |
89 | int err = 0; | |
90 | struct file_operations *old_fops; | |
91 | ||
92 | file->private_data = dvbdev; | |
93 | old_fops = file->f_op; | |
94 | file->f_op = fops_get(dvbdev->fops); | |
95 | if(file->f_op->open) | |
96 | err = file->f_op->open(inode,file); | |
97 | if (err) { | |
98 | fops_put(file->f_op); | |
99 | file->f_op = fops_get(old_fops); | |
100 | } | |
101 | fops_put(old_fops); | |
102 | return err; | |
103 | } | |
104 | return -ENODEV; | |
105 | } | |
106 | ||
107 | ||
108 | static struct file_operations dvb_device_fops = | |
109 | { | |
110 | .owner = THIS_MODULE, | |
111 | .open = dvb_device_open, | |
112 | }; | |
113 | ||
114 | static struct cdev dvb_device_cdev = { | |
115 | .kobj = {.name = "dvb", }, | |
116 | .owner = THIS_MODULE, | |
117 | }; | |
118 | ||
119 | int dvb_generic_open(struct inode *inode, struct file *file) | |
120 | { | |
121 | struct dvb_device *dvbdev = file->private_data; | |
122 | ||
123 | if (!dvbdev) | |
124 | return -ENODEV; | |
125 | ||
126 | if (!dvbdev->users) | |
127 | return -EBUSY; | |
128 | ||
129 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
130 | if (!dvbdev->readers) | |
131 | return -EBUSY; | |
132 | dvbdev->readers--; | |
133 | } else { | |
134 | if (!dvbdev->writers) | |
135 | return -EBUSY; | |
136 | dvbdev->writers--; | |
137 | } | |
138 | ||
139 | dvbdev->users--; | |
140 | return 0; | |
141 | } | |
142 | EXPORT_SYMBOL(dvb_generic_open); | |
143 | ||
144 | ||
145 | int dvb_generic_release(struct inode *inode, struct file *file) | |
146 | { | |
147 | struct dvb_device *dvbdev = file->private_data; | |
148 | ||
149 | if (!dvbdev) | |
150 | return -ENODEV; | |
151 | ||
152 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) { | |
153 | dvbdev->readers++; | |
154 | } else { | |
155 | dvbdev->writers++; | |
156 | } | |
157 | ||
158 | dvbdev->users++; | |
159 | return 0; | |
160 | } | |
161 | EXPORT_SYMBOL(dvb_generic_release); | |
162 | ||
163 | ||
164 | int dvb_generic_ioctl(struct inode *inode, struct file *file, | |
165 | unsigned int cmd, unsigned long arg) | |
166 | { | |
167 | struct dvb_device *dvbdev = file->private_data; | |
168 | ||
169 | if (!dvbdev) | |
170 | return -ENODEV; | |
171 | ||
172 | if (!dvbdev->kernel_ioctl) | |
173 | return -EINVAL; | |
174 | ||
175 | return dvb_usercopy (inode, file, cmd, arg, dvbdev->kernel_ioctl); | |
176 | } | |
177 | EXPORT_SYMBOL(dvb_generic_ioctl); | |
178 | ||
179 | ||
180 | static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) | |
181 | { | |
182 | u32 id = 0; | |
183 | ||
184 | while (id < DVB_MAX_IDS) { | |
185 | struct list_head *entry; | |
186 | list_for_each (entry, &adap->device_list) { | |
187 | struct dvb_device *dev; | |
188 | dev = list_entry (entry, struct dvb_device, list_head); | |
189 | if (dev->type == type && dev->id == id) | |
190 | goto skip; | |
191 | } | |
192 | return id; | |
193 | skip: | |
194 | id++; | |
195 | } | |
196 | return -ENFILE; | |
197 | } | |
198 | ||
199 | ||
200 | int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, | |
201 | const struct dvb_device *template, void *priv, int type) | |
202 | { | |
203 | struct dvb_device *dvbdev; | |
204 | int id; | |
205 | ||
206 | if (down_interruptible (&dvbdev_register_lock)) | |
207 | return -ERESTARTSYS; | |
208 | ||
209 | if ((id = dvbdev_get_free_id (adap, type)) < 0) { | |
210 | up (&dvbdev_register_lock); | |
211 | *pdvbdev = NULL; | |
212 | printk ("%s: could get find free device id...\n", __FUNCTION__); | |
213 | return -ENFILE; | |
214 | } | |
215 | ||
216 | *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); | |
217 | ||
218 | if (!dvbdev) { | |
219 | up(&dvbdev_register_lock); | |
220 | return -ENOMEM; | |
221 | } | |
222 | ||
223 | up (&dvbdev_register_lock); | |
224 | ||
225 | memcpy(dvbdev, template, sizeof(struct dvb_device)); | |
226 | dvbdev->type = type; | |
227 | dvbdev->id = id; | |
228 | dvbdev->adapter = adap; | |
229 | dvbdev->priv = priv; | |
230 | ||
231 | dvbdev->fops->owner = adap->module; | |
232 | ||
233 | list_add_tail (&dvbdev->list_head, &adap->device_list); | |
234 | ||
235 | devfs_mk_cdev(MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)), | |
236 | S_IFCHR | S_IRUSR | S_IWUSR, | |
237 | "dvb/adapter%d/%s%d", adap->num, dnames[type], id); | |
238 | ||
239 | class_simple_device_add(dvb_class, MKDEV(DVB_MAJOR, nums2minor(adap->num, type, id)), | |
240 | NULL, "dvb%d.%s%d", adap->num, dnames[type], id); | |
241 | ||
242 | dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", | |
243 | adap->num, dnames[type], id, nums2minor(adap->num, type, id), | |
244 | nums2minor(adap->num, type, id)); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | EXPORT_SYMBOL(dvb_register_device); | |
249 | ||
250 | ||
251 | void dvb_unregister_device(struct dvb_device *dvbdev) | |
252 | { | |
253 | if (!dvbdev) | |
254 | return; | |
255 | ||
256 | devfs_remove("dvb/adapter%d/%s%d", dvbdev->adapter->num, | |
257 | dnames[dvbdev->type], dvbdev->id); | |
258 | ||
259 | class_simple_device_remove(MKDEV(DVB_MAJOR, nums2minor(dvbdev->adapter->num, | |
260 | dvbdev->type, dvbdev->id))); | |
261 | ||
262 | list_del (&dvbdev->list_head); | |
263 | kfree (dvbdev); | |
264 | } | |
265 | EXPORT_SYMBOL(dvb_unregister_device); | |
266 | ||
267 | ||
268 | static int dvbdev_get_free_adapter_num (void) | |
269 | { | |
270 | int num = 0; | |
271 | ||
272 | while (num < DVB_MAX_ADAPTERS) { | |
273 | struct list_head *entry; | |
274 | list_for_each (entry, &dvb_adapter_list) { | |
275 | struct dvb_adapter *adap; | |
276 | adap = list_entry (entry, struct dvb_adapter, list_head); | |
277 | if (adap->num == num) | |
278 | goto skip; | |
279 | } | |
280 | return num; | |
281 | skip: | |
282 | num++; | |
283 | } | |
284 | ||
285 | return -ENFILE; | |
286 | } | |
287 | ||
288 | ||
fdc53a6d | 289 | int dvb_register_adapter(struct dvb_adapter *adap, const char *name, struct module *module) |
1da177e4 | 290 | { |
1da177e4 LT |
291 | int num; |
292 | ||
293 | if (down_interruptible (&dvbdev_register_lock)) | |
294 | return -ERESTARTSYS; | |
295 | ||
296 | if ((num = dvbdev_get_free_adapter_num ()) < 0) { | |
297 | up (&dvbdev_register_lock); | |
298 | return -ENFILE; | |
299 | } | |
300 | ||
1da177e4 LT |
301 | memset (adap, 0, sizeof(struct dvb_adapter)); |
302 | INIT_LIST_HEAD (&adap->device_list); | |
303 | ||
304 | printk ("DVB: registering new adapter (%s).\n", name); | |
305 | ||
306 | devfs_mk_dir("dvb/adapter%d", num); | |
307 | adap->num = num; | |
308 | adap->name = name; | |
309 | adap->module = module; | |
310 | ||
311 | list_add_tail (&adap->list_head, &dvb_adapter_list); | |
312 | ||
313 | up (&dvbdev_register_lock); | |
314 | ||
315 | return num; | |
316 | } | |
317 | EXPORT_SYMBOL(dvb_register_adapter); | |
318 | ||
319 | ||
320 | int dvb_unregister_adapter(struct dvb_adapter *adap) | |
321 | { | |
322 | devfs_remove("dvb/adapter%d", adap->num); | |
323 | ||
324 | if (down_interruptible (&dvbdev_register_lock)) | |
325 | return -ERESTARTSYS; | |
326 | list_del (&adap->list_head); | |
327 | up (&dvbdev_register_lock); | |
1da177e4 LT |
328 | return 0; |
329 | } | |
330 | EXPORT_SYMBOL(dvb_unregister_adapter); | |
331 | ||
332 | /* if the miracle happens and "generic_usercopy()" is included into | |
333 | the kernel, then this can vanish. please don't make the mistake and | |
334 | define this as video_usercopy(). this will introduce a dependecy | |
335 | to the v4l "videodev.o" module, which is unnecessary for some | |
336 | cards (ie. the budget dvb-cards don't need the v4l module...) */ | |
337 | int dvb_usercopy(struct inode *inode, struct file *file, | |
338 | unsigned int cmd, unsigned long arg, | |
339 | int (*func)(struct inode *inode, struct file *file, | |
340 | unsigned int cmd, void *arg)) | |
341 | { | |
342 | char sbuf[128]; | |
343 | void *mbuf = NULL; | |
344 | void *parg = NULL; | |
345 | int err = -EINVAL; | |
346 | ||
347 | /* Copy arguments into temp kernel buffer */ | |
348 | switch (_IOC_DIR(cmd)) { | |
349 | case _IOC_NONE: | |
350 | /* | |
351 | * For this command, the pointer is actually an integer | |
352 | * argument. | |
353 | */ | |
354 | parg = (void *) arg; | |
355 | break; | |
356 | case _IOC_READ: /* some v4l ioctls are marked wrong ... */ | |
357 | case _IOC_WRITE: | |
358 | case (_IOC_WRITE | _IOC_READ): | |
359 | if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { | |
360 | parg = sbuf; | |
361 | } else { | |
362 | /* too big to allocate from stack */ | |
363 | mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); | |
364 | if (NULL == mbuf) | |
365 | return -ENOMEM; | |
366 | parg = mbuf; | |
367 | } | |
368 | ||
369 | err = -EFAULT; | |
370 | if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) | |
371 | goto out; | |
372 | break; | |
373 | } | |
374 | ||
375 | /* call driver */ | |
376 | if ((err = func(inode, file, cmd, parg)) == -ENOIOCTLCMD) | |
377 | err = -EINVAL; | |
378 | ||
379 | if (err < 0) | |
380 | goto out; | |
381 | ||
382 | /* Copy results into user buffer */ | |
383 | switch (_IOC_DIR(cmd)) | |
384 | { | |
385 | case _IOC_READ: | |
386 | case (_IOC_WRITE | _IOC_READ): | |
387 | if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) | |
388 | err = -EFAULT; | |
389 | break; | |
390 | } | |
391 | ||
392 | out: | |
393 | kfree(mbuf); | |
394 | return err; | |
395 | } | |
396 | ||
397 | static int __init init_dvbdev(void) | |
398 | { | |
399 | int retval; | |
400 | dev_t dev = MKDEV(DVB_MAJOR, 0); | |
401 | ||
402 | if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { | |
403 | printk("dvb-core: unable to get major %d\n", DVB_MAJOR); | |
404 | return retval; | |
405 | } | |
406 | ||
407 | cdev_init(&dvb_device_cdev, &dvb_device_fops); | |
408 | if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { | |
409 | printk("dvb-core: unable to get major %d\n", DVB_MAJOR); | |
410 | goto error; | |
411 | } | |
412 | ||
413 | devfs_mk_dir("dvb"); | |
414 | ||
415 | dvb_class = class_simple_create(THIS_MODULE, "dvb"); | |
416 | if (IS_ERR(dvb_class)) { | |
417 | retval = PTR_ERR(dvb_class); | |
418 | goto error; | |
419 | } | |
420 | return 0; | |
421 | ||
422 | error: | |
423 | cdev_del(&dvb_device_cdev); | |
424 | unregister_chrdev_region(dev, MAX_DVB_MINORS); | |
425 | return retval; | |
426 | } | |
427 | ||
428 | ||
429 | static void __exit exit_dvbdev(void) | |
430 | { | |
431 | devfs_remove("dvb"); | |
432 | class_simple_destroy(dvb_class); | |
433 | cdev_del(&dvb_device_cdev); | |
434 | unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); | |
435 | } | |
436 | ||
437 | module_init(init_dvbdev); | |
438 | module_exit(exit_dvbdev); | |
439 | ||
440 | MODULE_DESCRIPTION("DVB Core Driver"); | |
441 | MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); | |
442 | MODULE_LICENSE("GPL"); |