blob: 2a77e9d42c687acc4773d68a4a2aa8b1176ff461 [file] [log] [blame]
Hans J. Kochbeafc542006-12-07 10:58:29 +01001/*
2 * drivers/uio/uio.c
3 *
4 * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
5 * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
6 * Copyright(C) 2006, Hans J. Koch <hjk@linutronix.de>
7 * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
8 *
9 * Userspace IO
10 *
11 * Base Functions
12 *
13 * Licensed under the GPLv2 only.
14 */
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/poll.h>
19#include <linux/device.h>
20#include <linux/mm.h>
21#include <linux/idr.h>
22#include <linux/string.h>
23#include <linux/kobject.h>
24#include <linux/uio_driver.h>
25
26#define UIO_MAX_DEVICES 255
27
28struct uio_device {
29 struct module *owner;
30 struct device *dev;
31 int minor;
32 atomic_t event;
33 struct fasync_struct *async_queue;
34 wait_queue_head_t wait;
35 int vma_count;
36 struct uio_info *info;
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000037 struct kobject *map_dir;
Hans J. Kochbeafc542006-12-07 10:58:29 +010038};
39
40static int uio_major;
41static DEFINE_IDR(uio_idr);
Jan Engelhardt4f014692008-01-22 20:50:54 +010042static const struct file_operations uio_fops;
Hans J. Kochbeafc542006-12-07 10:58:29 +010043
44/* UIO class infrastructure */
45static struct uio_class {
46 struct kref kref;
47 struct class *class;
48} *uio_class;
49
50/*
51 * attributes
52 */
53
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000054struct uio_map {
55 struct kobject kobj;
56 struct uio_mem *mem;
Hans J. Kochbeafc542006-12-07 10:58:29 +010057};
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000058#define to_map(map) container_of(map, struct uio_map, kobj)
Hans J. Kochbeafc542006-12-07 10:58:29 +010059
Hans J. Kochbeafc542006-12-07 10:58:29 +010060
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000061static ssize_t map_attr_show(struct kobject *kobj, struct kobj_attribute *attr,
Hans J. Kochbeafc542006-12-07 10:58:29 +010062 char *buf)
63{
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000064 struct uio_map *map = to_map(kobj);
65 struct uio_mem *mem = map->mem;
Hans J. Kochbeafc542006-12-07 10:58:29 +010066
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000067 if (strncmp(attr->attr.name, "addr", 4) == 0)
Hans J. Kochbeafc542006-12-07 10:58:29 +010068 return sprintf(buf, "0x%lx\n", mem->addr);
69
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000070 if (strncmp(attr->attr.name, "size", 4) == 0)
Hans J. Kochbeafc542006-12-07 10:58:29 +010071 return sprintf(buf, "0x%lx\n", mem->size);
72
73 return -ENODEV;
74}
75
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000076static struct kobj_attribute attr_attribute =
77 __ATTR(addr, S_IRUGO, map_attr_show, NULL);
78static struct kobj_attribute size_attribute =
79 __ATTR(size, S_IRUGO, map_attr_show, NULL);
Hans J. Kochbeafc542006-12-07 10:58:29 +010080
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000081static struct attribute *attrs[] = {
82 &attr_attribute.attr,
83 &size_attribute.attr,
84 NULL, /* need to NULL terminate the list of attributes */
Hans J. Kochbeafc542006-12-07 10:58:29 +010085};
86
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000087static void map_release(struct kobject *kobj)
88{
89 struct uio_map *map = to_map(kobj);
90 kfree(map);
91}
92
Hans J. Kochbeafc542006-12-07 10:58:29 +010093static struct kobj_type map_attr_type = {
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +000094 .release = map_release,
95 .default_attrs = attrs,
Hans J. Kochbeafc542006-12-07 10:58:29 +010096};
97
98static ssize_t show_name(struct device *dev,
99 struct device_attribute *attr, char *buf)
100{
101 struct uio_device *idev = dev_get_drvdata(dev);
102 if (idev)
103 return sprintf(buf, "%s\n", idev->info->name);
104 else
105 return -ENODEV;
106}
107static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
108
109static ssize_t show_version(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 struct uio_device *idev = dev_get_drvdata(dev);
113 if (idev)
114 return sprintf(buf, "%s\n", idev->info->version);
115 else
116 return -ENODEV;
117}
118static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
119
120static ssize_t show_event(struct device *dev,
121 struct device_attribute *attr, char *buf)
122{
123 struct uio_device *idev = dev_get_drvdata(dev);
124 if (idev)
125 return sprintf(buf, "%u\n",
126 (unsigned int)atomic_read(&idev->event));
127 else
128 return -ENODEV;
129}
130static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
131
132static struct attribute *uio_attrs[] = {
133 &dev_attr_name.attr,
134 &dev_attr_version.attr,
135 &dev_attr_event.attr,
136 NULL,
137};
138
139static struct attribute_group uio_attr_grp = {
140 .attrs = uio_attrs,
141};
142
143/*
144 * device functions
145 */
146static int uio_dev_add_attributes(struct uio_device *idev)
147{
148 int ret;
149 int mi;
150 int map_found = 0;
151 struct uio_mem *mem;
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +0000152 struct uio_map *map;
Hans J. Kochbeafc542006-12-07 10:58:29 +0100153
154 ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp);
155 if (ret)
156 goto err_group;
157
158 for (mi = 0; mi < MAX_UIO_MAPS; mi++) {
159 mem = &idev->info->mem[mi];
160 if (mem->size == 0)
161 break;
162 if (!map_found) {
163 map_found = 1;
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +0000164 idev->map_dir = kobject_create_and_add("maps",
165 &idev->dev->kobj);
166 if (!idev->map_dir)
167 goto err;
Hans J. Kochbeafc542006-12-07 10:58:29 +0100168 }
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +0000169 map = kzalloc(sizeof(*map), GFP_KERNEL);
170 if (!map)
171 goto err;
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700172 kobject_init(&map->kobj, &map_attr_type);
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +0000173 map->mem = mem;
174 mem->map = map;
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700175 ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi);
Hans J. Kochbeafc542006-12-07 10:58:29 +0100176 if (ret)
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +0000177 goto err;
178 ret = kobject_uevent(&map->kobj, KOBJ_ADD);
179 if (ret)
180 goto err;
Hans J. Kochbeafc542006-12-07 10:58:29 +0100181 }
182
183 return 0;
184
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +0000185err:
Hans J. Kochbeafc542006-12-07 10:58:29 +0100186 for (mi--; mi>=0; mi--) {
187 mem = &idev->info->mem[mi];
Greg Kroah-Hartman81e7c6a2007-12-04 22:41:54 +0000188 map = mem->map;
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800189 kobject_put(&map->kobj);
Hans J. Kochbeafc542006-12-07 10:58:29 +0100190 }
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800191 kobject_put(idev->map_dir);
Hans J. Kochbeafc542006-12-07 10:58:29 +0100192 sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp);
193err_group:
194 dev_err(idev->dev, "error creating sysfs files (%d)\n", ret);
195 return ret;
196}
197
198static void uio_dev_del_attributes(struct uio_device *idev)
199{
200 int mi;
201 struct uio_mem *mem;
202 for (mi = 0; mi < MAX_UIO_MAPS; mi++) {
203 mem = &idev->info->mem[mi];
204 if (mem->size == 0)
205 break;
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800206 kobject_put(&mem->map->kobj);
Hans J. Kochbeafc542006-12-07 10:58:29 +0100207 }
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800208 kobject_put(idev->map_dir);
Hans J. Kochbeafc542006-12-07 10:58:29 +0100209 sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp);
210}
211
212static int uio_get_minor(struct uio_device *idev)
213{
214 static DEFINE_MUTEX(minor_lock);
215 int retval = -ENOMEM;
216 int id;
217
218 mutex_lock(&minor_lock);
219 if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0)
220 goto exit;
221
222 retval = idr_get_new(&uio_idr, idev, &id);
223 if (retval < 0) {
224 if (retval == -EAGAIN)
225 retval = -ENOMEM;
226 goto exit;
227 }
228 idev->minor = id & MAX_ID_MASK;
229exit:
230 mutex_unlock(&minor_lock);
231 return retval;
232}
233
234static void uio_free_minor(struct uio_device *idev)
235{
236 idr_remove(&uio_idr, idev->minor);
237}
238
239/**
240 * uio_event_notify - trigger an interrupt event
241 * @info: UIO device capabilities
242 */
243void uio_event_notify(struct uio_info *info)
244{
245 struct uio_device *idev = info->uio_dev;
246
247 atomic_inc(&idev->event);
248 wake_up_interruptible(&idev->wait);
249 kill_fasync(&idev->async_queue, SIGIO, POLL_IN);
250}
251EXPORT_SYMBOL_GPL(uio_event_notify);
252
253/**
254 * uio_interrupt - hardware interrupt handler
255 * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer
256 * @dev_id: Pointer to the devices uio_device structure
257 */
258static irqreturn_t uio_interrupt(int irq, void *dev_id)
259{
260 struct uio_device *idev = (struct uio_device *)dev_id;
261 irqreturn_t ret = idev->info->handler(irq, idev->info);
262
263 if (ret == IRQ_HANDLED)
264 uio_event_notify(idev->info);
265
266 return ret;
267}
268
269struct uio_listener {
270 struct uio_device *dev;
271 s32 event_count;
272};
273
274static int uio_open(struct inode *inode, struct file *filep)
275{
276 struct uio_device *idev;
277 struct uio_listener *listener;
278 int ret = 0;
279
280 idev = idr_find(&uio_idr, iminor(inode));
281 if (!idev)
282 return -ENODEV;
283
284 listener = kmalloc(sizeof(*listener), GFP_KERNEL);
285 if (!listener)
286 return -ENOMEM;
287
288 listener->dev = idev;
289 listener->event_count = atomic_read(&idev->event);
290 filep->private_data = listener;
291
292 if (idev->info->open) {
293 if (!try_module_get(idev->owner))
294 return -ENODEV;
295 ret = idev->info->open(idev->info, inode);
296 module_put(idev->owner);
297 }
298
299 if (ret)
300 kfree(listener);
301
302 return ret;
303}
304
305static int uio_fasync(int fd, struct file *filep, int on)
306{
307 struct uio_listener *listener = filep->private_data;
308 struct uio_device *idev = listener->dev;
309
310 return fasync_helper(fd, filep, on, &idev->async_queue);
311}
312
313static int uio_release(struct inode *inode, struct file *filep)
314{
315 int ret = 0;
316 struct uio_listener *listener = filep->private_data;
317 struct uio_device *idev = listener->dev;
318
319 if (idev->info->release) {
320 if (!try_module_get(idev->owner))
321 return -ENODEV;
322 ret = idev->info->release(idev->info, inode);
323 module_put(idev->owner);
324 }
325 if (filep->f_flags & FASYNC)
326 ret = uio_fasync(-1, filep, 0);
327 kfree(listener);
328 return ret;
329}
330
331static unsigned int uio_poll(struct file *filep, poll_table *wait)
332{
333 struct uio_listener *listener = filep->private_data;
334 struct uio_device *idev = listener->dev;
335
336 if (idev->info->irq == UIO_IRQ_NONE)
337 return -EIO;
338
339 poll_wait(filep, &idev->wait, wait);
340 if (listener->event_count != atomic_read(&idev->event))
341 return POLLIN | POLLRDNORM;
342 return 0;
343}
344
345static ssize_t uio_read(struct file *filep, char __user *buf,
346 size_t count, loff_t *ppos)
347{
348 struct uio_listener *listener = filep->private_data;
349 struct uio_device *idev = listener->dev;
350 DECLARE_WAITQUEUE(wait, current);
351 ssize_t retval;
352 s32 event_count;
353
354 if (idev->info->irq == UIO_IRQ_NONE)
355 return -EIO;
356
357 if (count != sizeof(s32))
358 return -EINVAL;
359
360 add_wait_queue(&idev->wait, &wait);
361
362 do {
363 set_current_state(TASK_INTERRUPTIBLE);
364
365 event_count = atomic_read(&idev->event);
366 if (event_count != listener->event_count) {
367 if (copy_to_user(buf, &event_count, count))
368 retval = -EFAULT;
369 else {
370 listener->event_count = event_count;
371 retval = count;
372 }
373 break;
374 }
375
376 if (filep->f_flags & O_NONBLOCK) {
377 retval = -EAGAIN;
378 break;
379 }
380
381 if (signal_pending(current)) {
382 retval = -ERESTARTSYS;
383 break;
384 }
385 schedule();
386 } while (1);
387
388 __set_current_state(TASK_RUNNING);
389 remove_wait_queue(&idev->wait, &wait);
390
391 return retval;
392}
393
394static int uio_find_mem_index(struct vm_area_struct *vma)
395{
396 int mi;
397 struct uio_device *idev = vma->vm_private_data;
398
399 for (mi = 0; mi < MAX_UIO_MAPS; mi++) {
400 if (idev->info->mem[mi].size == 0)
401 return -1;
402 if (vma->vm_pgoff == mi)
403 return mi;
404 }
405 return -1;
406}
407
408static void uio_vma_open(struct vm_area_struct *vma)
409{
410 struct uio_device *idev = vma->vm_private_data;
411 idev->vma_count++;
412}
413
414static void uio_vma_close(struct vm_area_struct *vma)
415{
416 struct uio_device *idev = vma->vm_private_data;
417 idev->vma_count--;
418}
419
Nick Piggina18b6302008-02-06 01:37:35 -0800420static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Hans J. Kochbeafc542006-12-07 10:58:29 +0100421{
422 struct uio_device *idev = vma->vm_private_data;
Nick Piggina18b6302008-02-06 01:37:35 -0800423 struct page *page;
Hans J. Kochbeafc542006-12-07 10:58:29 +0100424
425 int mi = uio_find_mem_index(vma);
426 if (mi < 0)
Nick Piggina18b6302008-02-06 01:37:35 -0800427 return VM_FAULT_SIGBUS;
Hans J. Kochbeafc542006-12-07 10:58:29 +0100428
429 if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
430 page = virt_to_page(idev->info->mem[mi].addr);
431 else
432 page = vmalloc_to_page((void*)idev->info->mem[mi].addr);
433 get_page(page);
Nick Piggina18b6302008-02-06 01:37:35 -0800434 vmf->page = page;
435 return 0;
Hans J. Kochbeafc542006-12-07 10:58:29 +0100436}
437
438static struct vm_operations_struct uio_vm_ops = {
439 .open = uio_vma_open,
440 .close = uio_vma_close,
Nick Piggina18b6302008-02-06 01:37:35 -0800441 .fault = uio_vma_fault,
Hans J. Kochbeafc542006-12-07 10:58:29 +0100442};
443
444static int uio_mmap_physical(struct vm_area_struct *vma)
445{
446 struct uio_device *idev = vma->vm_private_data;
447 int mi = uio_find_mem_index(vma);
448 if (mi < 0)
449 return -EINVAL;
450
451 vma->vm_flags |= VM_IO | VM_RESERVED;
452
453 return remap_pfn_range(vma,
454 vma->vm_start,
455 idev->info->mem[mi].addr >> PAGE_SHIFT,
456 vma->vm_end - vma->vm_start,
457 vma->vm_page_prot);
458}
459
460static int uio_mmap_logical(struct vm_area_struct *vma)
461{
462 vma->vm_flags |= VM_RESERVED;
463 vma->vm_ops = &uio_vm_ops;
464 uio_vma_open(vma);
465 return 0;
466}
467
468static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
469{
470 struct uio_listener *listener = filep->private_data;
471 struct uio_device *idev = listener->dev;
472 int mi;
473 unsigned long requested_pages, actual_pages;
474 int ret = 0;
475
476 if (vma->vm_end < vma->vm_start)
477 return -EINVAL;
478
479 vma->vm_private_data = idev;
480
481 mi = uio_find_mem_index(vma);
482 if (mi < 0)
483 return -EINVAL;
484
485 requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
486 actual_pages = (idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT;
487 if (requested_pages > actual_pages)
488 return -EINVAL;
489
490 if (idev->info->mmap) {
491 if (!try_module_get(idev->owner))
492 return -ENODEV;
493 ret = idev->info->mmap(idev->info, vma);
494 module_put(idev->owner);
495 return ret;
496 }
497
498 switch (idev->info->mem[mi].memtype) {
499 case UIO_MEM_PHYS:
500 return uio_mmap_physical(vma);
501 case UIO_MEM_LOGICAL:
502 case UIO_MEM_VIRTUAL:
503 return uio_mmap_logical(vma);
504 default:
505 return -EINVAL;
506 }
507}
508
Jan Engelhardt4f014692008-01-22 20:50:54 +0100509static const struct file_operations uio_fops = {
Hans J. Kochbeafc542006-12-07 10:58:29 +0100510 .owner = THIS_MODULE,
511 .open = uio_open,
512 .release = uio_release,
513 .read = uio_read,
514 .mmap = uio_mmap,
515 .poll = uio_poll,
516 .fasync = uio_fasync,
517};
518
519static int uio_major_init(void)
520{
521 uio_major = register_chrdev(0, "uio", &uio_fops);
522 if (uio_major < 0)
523 return uio_major;
524 return 0;
525}
526
527static void uio_major_cleanup(void)
528{
529 unregister_chrdev(uio_major, "uio");
530}
531
532static int init_uio_class(void)
533{
534 int ret = 0;
535
536 if (uio_class != NULL) {
537 kref_get(&uio_class->kref);
538 goto exit;
539 }
540
541 /* This is the first time in here, set everything up properly */
542 ret = uio_major_init();
543 if (ret)
544 goto exit;
545
546 uio_class = kzalloc(sizeof(*uio_class), GFP_KERNEL);
547 if (!uio_class) {
548 ret = -ENOMEM;
549 goto err_kzalloc;
550 }
551
552 kref_init(&uio_class->kref);
553 uio_class->class = class_create(THIS_MODULE, "uio");
554 if (IS_ERR(uio_class->class)) {
555 ret = IS_ERR(uio_class->class);
556 printk(KERN_ERR "class_create failed for uio\n");
557 goto err_class_create;
558 }
559 return 0;
560
561err_class_create:
562 kfree(uio_class);
563 uio_class = NULL;
564err_kzalloc:
565 uio_major_cleanup();
566exit:
567 return ret;
568}
569
570static void release_uio_class(struct kref *kref)
571{
572 /* Ok, we cheat as we know we only have one uio_class */
573 class_destroy(uio_class->class);
574 kfree(uio_class);
575 uio_major_cleanup();
576 uio_class = NULL;
577}
578
579static void uio_class_destroy(void)
580{
581 if (uio_class)
582 kref_put(&uio_class->kref, release_uio_class);
583}
584
585/**
586 * uio_register_device - register a new userspace IO device
587 * @owner: module that creates the new device
588 * @parent: parent device
589 * @info: UIO device capabilities
590 *
591 * returns zero on success or a negative error code.
592 */
593int __uio_register_device(struct module *owner,
594 struct device *parent,
595 struct uio_info *info)
596{
597 struct uio_device *idev;
598 int ret = 0;
599
600 if (!parent || !info || !info->name || !info->version)
601 return -EINVAL;
602
603 info->uio_dev = NULL;
604
605 ret = init_uio_class();
606 if (ret)
607 return ret;
608
609 idev = kzalloc(sizeof(*idev), GFP_KERNEL);
610 if (!idev) {
611 ret = -ENOMEM;
612 goto err_kzalloc;
613 }
614
615 idev->owner = owner;
616 idev->info = info;
617 init_waitqueue_head(&idev->wait);
618 atomic_set(&idev->event, 0);
619
620 ret = uio_get_minor(idev);
621 if (ret)
622 goto err_get_minor;
623
624 idev->dev = device_create(uio_class->class, parent,
625 MKDEV(uio_major, idev->minor),
626 "uio%d", idev->minor);
627 if (IS_ERR(idev->dev)) {
628 printk(KERN_ERR "UIO: device register failed\n");
629 ret = PTR_ERR(idev->dev);
630 goto err_device_create;
631 }
632 dev_set_drvdata(idev->dev, idev);
633
634 ret = uio_dev_add_attributes(idev);
635 if (ret)
636 goto err_uio_dev_add_attributes;
637
638 info->uio_dev = idev;
639
640 if (idev->info->irq >= 0) {
641 ret = request_irq(idev->info->irq, uio_interrupt,
642 idev->info->irq_flags, idev->info->name, idev);
643 if (ret)
644 goto err_request_irq;
645 }
646
647 return 0;
648
649err_request_irq:
650 uio_dev_del_attributes(idev);
651err_uio_dev_add_attributes:
652 device_destroy(uio_class->class, MKDEV(uio_major, idev->minor));
653err_device_create:
654 uio_free_minor(idev);
655err_get_minor:
656 kfree(idev);
657err_kzalloc:
658 uio_class_destroy();
659 return ret;
660}
661EXPORT_SYMBOL_GPL(__uio_register_device);
662
663/**
664 * uio_unregister_device - unregister a industrial IO device
665 * @info: UIO device capabilities
666 *
667 */
668void uio_unregister_device(struct uio_info *info)
669{
670 struct uio_device *idev;
671
672 if (!info || !info->uio_dev)
673 return;
674
675 idev = info->uio_dev;
676
677 uio_free_minor(idev);
678
679 if (info->irq >= 0)
680 free_irq(info->irq, idev);
681
682 uio_dev_del_attributes(idev);
683
684 dev_set_drvdata(idev->dev, NULL);
685 device_destroy(uio_class->class, MKDEV(uio_major, idev->minor));
686 kfree(idev);
687 uio_class_destroy();
688
689 return;
690}
691EXPORT_SYMBOL_GPL(uio_unregister_device);
692
693static int __init uio_init(void)
694{
695 return 0;
696}
697
698static void __exit uio_exit(void)
699{
700}
701
702module_init(uio_init)
703module_exit(uio_exit)
704MODULE_LICENSE("GPL v2");