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/kernel.h> 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> 34#include <linux/mutex.h> 35#include <linux/smp_lock.h> 36#include "dvbdev.h" 37 38static int dvbdev_debug; 39 40module_param(dvbdev_debug, int, 0644); 41MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); 42 43#define dprintk if (dvbdev_debug) printk 44 45static LIST_HEAD(dvb_adapter_list); 46static DEFINE_MUTEX(dvbdev_register_lock); 47 48static const char * const dnames[] = { 49 "video", "audio", "sec", "frontend", "demux", "dvr", "ca", 50 "net", "osd" 51}; 52 53#ifdef CONFIG_DVB_DYNAMIC_MINORS 54#define MAX_DVB_MINORS 256 55#define DVB_MAX_IDS MAX_DVB_MINORS 56#else 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) 60#endif 61 62static struct class *dvb_class; 63 64static struct dvb_device *dvb_minors[MAX_DVB_MINORS]; 65static DECLARE_RWSEM(minor_rwsem); 66 67static int dvb_device_open(struct inode *inode, struct file *file) 68{ 69 struct dvb_device *dvbdev; 70 71 lock_kernel(); 72 down_read(&minor_rwsem); 73 dvbdev = dvb_minors[iminor(inode)]; 74 75 if (dvbdev && dvbdev->fops) { 76 int err = 0; 77 const struct file_operations *old_fops; 78 79 file->private_data = dvbdev; 80 old_fops = file->f_op; 81 file->f_op = fops_get(dvbdev->fops); 82 if (file->f_op == NULL) { 83 file->f_op = old_fops; 84 goto fail; 85 } 86 if(file->f_op->open) 87 err = file->f_op->open(inode,file); 88 if (err) { 89 fops_put(file->f_op); 90 file->f_op = fops_get(old_fops); 91 } 92 fops_put(old_fops); 93 up_read(&minor_rwsem); 94 unlock_kernel(); 95 return err; 96 } 97fail: 98 up_read(&minor_rwsem); 99 unlock_kernel(); 100 return -ENODEV; 101} 102 103 104static const struct file_operations dvb_device_fops = 105{ 106 .owner = THIS_MODULE, 107 .open = dvb_device_open, 108}; 109 110static struct cdev dvb_device_cdev; 111 112int dvb_generic_open(struct inode *inode, struct file *file) 113{ 114 struct dvb_device *dvbdev = file->private_data; 115 116 if (!dvbdev) 117 return -ENODEV; 118 119 if (!dvbdev->users) 120 return -EBUSY; 121 122 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 123 if (!dvbdev->readers) 124 return -EBUSY; 125 dvbdev->readers--; 126 } else { 127 if (!dvbdev->writers) 128 return -EBUSY; 129 dvbdev->writers--; 130 } 131 132 dvbdev->users--; 133 return 0; 134} 135EXPORT_SYMBOL(dvb_generic_open); 136 137 138int dvb_generic_release(struct inode *inode, struct file *file) 139{ 140 struct dvb_device *dvbdev = file->private_data; 141 142 if (!dvbdev) 143 return -ENODEV; 144 145 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 146 dvbdev->readers++; 147 } else { 148 dvbdev->writers++; 149 } 150 151 dvbdev->users++; 152 return 0; 153} 154EXPORT_SYMBOL(dvb_generic_release); 155 156 157long dvb_generic_ioctl(struct file *file, 158 unsigned int cmd, unsigned long arg) 159{ 160 struct dvb_device *dvbdev = file->private_data; 161 int ret; 162 163 if (!dvbdev) 164 return -ENODEV; 165 166 if (!dvbdev->kernel_ioctl) 167 return -EINVAL; 168 169 lock_kernel(); 170 ret = dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); 171 unlock_kernel(); 172 173 return ret; 174} 175EXPORT_SYMBOL(dvb_generic_ioctl); 176 177 178static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) 179{ 180 u32 id = 0; 181 182 while (id < DVB_MAX_IDS) { 183 struct dvb_device *dev; 184 list_for_each_entry(dev, &adap->device_list, list_head) 185 if (dev->type == type && dev->id == id) 186 goto skip; 187 return id; 188skip: 189 id++; 190 } 191 return -ENFILE; 192} 193 194 195int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 196 const struct dvb_device *template, void *priv, int type) 197{ 198 struct dvb_device *dvbdev; 199 struct file_operations *dvbdevfops; 200 struct device *clsdev; 201 int minor; 202 int id; 203 204 mutex_lock(&dvbdev_register_lock); 205 206 if ((id = dvbdev_get_free_id (adap, type)) < 0){ 207 mutex_unlock(&dvbdev_register_lock); 208 *pdvbdev = NULL; 209 printk(KERN_ERR "%s: couldn't find free device id\n", __func__); 210 return -ENFILE; 211 } 212 213 *pdvbdev = dvbdev = kmalloc(sizeof(struct dvb_device), GFP_KERNEL); 214 215 if (!dvbdev){ 216 mutex_unlock(&dvbdev_register_lock); 217 return -ENOMEM; 218 } 219 220 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); 221 222 if (!dvbdevfops){ 223 kfree (dvbdev); 224 mutex_unlock(&dvbdev_register_lock); 225 return -ENOMEM; 226 } 227 228 memcpy(dvbdev, template, sizeof(struct dvb_device)); 229 dvbdev->type = type; 230 dvbdev->id = id; 231 dvbdev->adapter = adap; 232 dvbdev->priv = priv; 233 dvbdev->fops = dvbdevfops; 234 init_waitqueue_head (&dvbdev->wait_queue); 235 236 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); 237 dvbdevfops->owner = adap->module; 238 239 list_add_tail (&dvbdev->list_head, &adap->device_list); 240 241 down_write(&minor_rwsem); 242#ifdef CONFIG_DVB_DYNAMIC_MINORS 243 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 244 if (dvb_minors[minor] == NULL) 245 break; 246 247 if (minor == MAX_DVB_MINORS) { 248 kfree(dvbdevfops); 249 kfree(dvbdev); 250 mutex_unlock(&dvbdev_register_lock); 251 return -EINVAL; 252 } 253#else 254 minor = nums2minor(adap->num, type, id); 255#endif 256 257 dvbdev->minor = minor; 258 dvb_minors[minor] = dvbdev; 259 up_write(&minor_rwsem); 260 261 mutex_unlock(&dvbdev_register_lock); 262 263 clsdev = device_create(dvb_class, adap->device, 264 MKDEV(DVB_MAJOR, minor), 265 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 266 if (IS_ERR(clsdev)) { 267 printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n", 268 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); 269 return PTR_ERR(clsdev); 270 } 271 272 dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 273 adap->num, dnames[type], id, minor, minor); 274 275 return 0; 276} 277EXPORT_SYMBOL(dvb_register_device); 278 279 280void dvb_unregister_device(struct dvb_device *dvbdev) 281{ 282 if (!dvbdev) 283 return; 284 285 down_write(&minor_rwsem); 286 dvb_minors[dvbdev->minor] = NULL; 287 up_write(&minor_rwsem); 288 289 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 290 291 list_del (&dvbdev->list_head); 292 kfree (dvbdev->fops); 293 kfree (dvbdev); 294} 295EXPORT_SYMBOL(dvb_unregister_device); 296 297static int dvbdev_check_free_adapter_num(int num) 298{ 299 struct list_head *entry; 300 list_for_each(entry, &dvb_adapter_list) { 301 struct dvb_adapter *adap; 302 adap = list_entry(entry, struct dvb_adapter, list_head); 303 if (adap->num == num) 304 return 0; 305 } 306 return 1; 307} 308 309static int dvbdev_get_free_adapter_num (void) 310{ 311 int num = 0; 312 313 while (num < DVB_MAX_ADAPTERS) { 314 if (dvbdev_check_free_adapter_num(num)) 315 return num; 316 num++; 317 } 318 319 return -ENFILE; 320} 321 322 323int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 324 struct module *module, struct device *device, 325 short *adapter_nums) 326{ 327 int i, num; 328 329 mutex_lock(&dvbdev_register_lock); 330 331 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 332 num = adapter_nums[i]; 333 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 334 /* use the one the driver asked for */ 335 if (dvbdev_check_free_adapter_num(num)) 336 break; 337 } else { 338 num = dvbdev_get_free_adapter_num(); 339 break; 340 } 341 num = -1; 342 } 343 344 if (num < 0) { 345 mutex_unlock(&dvbdev_register_lock); 346 return -ENFILE; 347 } 348 349 memset (adap, 0, sizeof(struct dvb_adapter)); 350 INIT_LIST_HEAD (&adap->device_list); 351 352 printk(KERN_INFO "DVB: registering new adapter (%s)\n", name); 353 354 adap->num = num; 355 adap->name = name; 356 adap->module = module; 357 adap->device = device; 358 adap->mfe_shared = 0; 359 adap->mfe_dvbdev = NULL; 360 mutex_init (&adap->mfe_lock); 361 362 list_add_tail (&adap->list_head, &dvb_adapter_list); 363 364 mutex_unlock(&dvbdev_register_lock); 365 366 return num; 367} 368EXPORT_SYMBOL(dvb_register_adapter); 369 370 371int dvb_unregister_adapter(struct dvb_adapter *adap) 372{ 373 mutex_lock(&dvbdev_register_lock); 374 list_del (&adap->list_head); 375 mutex_unlock(&dvbdev_register_lock); 376 return 0; 377} 378EXPORT_SYMBOL(dvb_unregister_adapter); 379 380/* if the miracle happens and "generic_usercopy()" is included into 381 the kernel, then this can vanish. please don't make the mistake and 382 define this as video_usercopy(). this will introduce a dependecy 383 to the v4l "videodev.o" module, which is unnecessary for some 384 cards (ie. the budget dvb-cards don't need the v4l module...) */ 385int dvb_usercopy(struct file *file, 386 unsigned int cmd, unsigned long arg, 387 int (*func)(struct file *file, 388 unsigned int cmd, void *arg)) 389{ 390 char sbuf[128]; 391 void *mbuf = NULL; 392 void *parg = NULL; 393 int err = -EINVAL; 394 395 /* Copy arguments into temp kernel buffer */ 396 switch (_IOC_DIR(cmd)) { 397 case _IOC_NONE: 398 /* 399 * For this command, the pointer is actually an integer 400 * argument. 401 */ 402 parg = (void *) arg; 403 break; 404 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 405 case _IOC_WRITE: 406 case (_IOC_WRITE | _IOC_READ): 407 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 408 parg = sbuf; 409 } else { 410 /* too big to allocate from stack */ 411 mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); 412 if (NULL == mbuf) 413 return -ENOMEM; 414 parg = mbuf; 415 } 416 417 err = -EFAULT; 418 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 419 goto out; 420 break; 421 } 422 423 /* call driver */ 424 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 425 err = -EINVAL; 426 427 if (err < 0) 428 goto out; 429 430 /* Copy results into user buffer */ 431 switch (_IOC_DIR(cmd)) 432 { 433 case _IOC_READ: 434 case (_IOC_WRITE | _IOC_READ): 435 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 436 err = -EFAULT; 437 break; 438 } 439 440out: 441 kfree(mbuf); 442 return err; 443} 444 445static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 446{ 447 struct dvb_device *dvbdev = dev_get_drvdata(dev); 448 449 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 450 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 451 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 452 return 0; 453} 454 455static char *dvb_devnode(struct device *dev, mode_t *mode) 456{ 457 struct dvb_device *dvbdev = dev_get_drvdata(dev); 458 459 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 460 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 461} 462 463 464static int __init init_dvbdev(void) 465{ 466 int retval; 467 dev_t dev = MKDEV(DVB_MAJOR, 0); 468 469 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 470 printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR); 471 return retval; 472 } 473 474 cdev_init(&dvb_device_cdev, &dvb_device_fops); 475 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 476 printk(KERN_ERR "dvb-core: unable register character device\n"); 477 goto error; 478 } 479 480 dvb_class = class_create(THIS_MODULE, "dvb"); 481 if (IS_ERR(dvb_class)) { 482 retval = PTR_ERR(dvb_class); 483 goto error; 484 } 485 dvb_class->dev_uevent = dvb_uevent; 486 dvb_class->devnode = dvb_devnode; 487 return 0; 488 489error: 490 cdev_del(&dvb_device_cdev); 491 unregister_chrdev_region(dev, MAX_DVB_MINORS); 492 return retval; 493} 494 495 496static void __exit exit_dvbdev(void) 497{ 498 class_destroy(dvb_class); 499 cdev_del(&dvb_device_cdev); 500 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 501} 502 503subsys_initcall(init_dvbdev); 504module_exit(exit_dvbdev); 505 506MODULE_DESCRIPTION("DVB Core Driver"); 507MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 508MODULE_LICENSE("GPL"); 509