summaryrefslogtreecommitdiff
path: root/drivers/input/touchscreen/ucb1400_ts.c
blob: 89373b01d8f5694148dab2f6ccf6d67839c65ee6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
/*
 *  Philips UCB1400 touchscreen driver
 *
 *  Author:	Nicolas Pitre
 *  Created:	September 25, 2006
 *  Copyright:	MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This code is heavily based on ucb1x00-*.c copyrighted by Russell King
 * covering the UCB1100, UCB1200 and UCB1300..  Support for the UCB1400 has
 * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/suspend.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/freezer.h>

#include <sound/driver.h>
#include <sound/core.h>
#include <sound/ac97_codec.h>


/*
 * Interesting UCB1400 AC-link registers
 */

#define UCB_IE_RIS		0x5e
#define UCB_IE_FAL		0x60
#define UCB_IE_STATUS		0x62
#define UCB_IE_CLEAR		0x62
#define UCB_IE_ADC		(1 << 11)
#define UCB_IE_TSPX		(1 << 12)

#define UCB_TS_CR		0x64
#define UCB_TS_CR_TSMX_POW	(1 << 0)
#define UCB_TS_CR_TSPX_POW	(1 << 1)
#define UCB_TS_CR_TSMY_POW	(1 << 2)
#define UCB_TS_CR_TSPY_POW	(1 << 3)
#define UCB_TS_CR_TSMX_GND	(1 << 4)
#define UCB_TS_CR_TSPX_GND	(1 << 5)
#define UCB_TS_CR_TSMY_GND	(1 << 6)
#define UCB_TS_CR_TSPY_GND	(1 << 7)
#define UCB_TS_CR_MODE_INT	(0 << 8)
#define UCB_TS_CR_MODE_PRES	(1 << 8)
#define UCB_TS_CR_MODE_POS	(2 << 8)
#define UCB_TS_CR_BIAS_ENA	(1 << 11)
#define UCB_TS_CR_TSPX_LOW	(1 << 12)
#define UCB_TS_CR_TSMX_LOW	(1 << 13)

#define UCB_ADC_CR		0x66
#define UCB_ADC_SYNC_ENA	(1 << 0)
#define UCB_ADC_VREFBYP_CON	(1 << 1)
#define UCB_ADC_INP_TSPX	(0 << 2)
#define UCB_ADC_INP_TSMX	(1 << 2)
#define UCB_ADC_INP_TSPY	(2 << 2)
#define UCB_ADC_INP_TSMY	(3 << 2)
#define UCB_ADC_INP_AD0		(4 << 2)
#define UCB_ADC_INP_AD1		(5 << 2)
#define UCB_ADC_INP_AD2		(6 << 2)
#define UCB_ADC_INP_AD3		(7 << 2)
#define UCB_ADC_EXT_REF		(1 << 5)
#define UCB_ADC_START		(1 << 7)
#define UCB_ADC_ENA		(1 << 15)

#define UCB_ADC_DATA		0x68
#define UCB_ADC_DAT_VALID	(1 << 15)
#define UCB_ADC_DAT_VALUE(x)	((x) & 0x3ff)

#define UCB_ID			0x7e
#define UCB_ID_1400             0x4304


struct ucb1400 {
	struct snd_ac97		*ac97;
	struct input_dev	*ts_idev;

	int			irq;

	wait_queue_head_t	ts_wait;
	struct task_struct	*ts_task;

	unsigned int		irq_pending;	/* not bit field shared */
	unsigned int		ts_restart:1;
	unsigned int		adcsync:1;
};

static int adcsync;
static int ts_delay = 55; /* us */
static int ts_delay_pressure;	/* us */

static inline u16 ucb1400_reg_read(struct ucb1400 *ucb, u16 reg)
{
	return ucb->ac97->bus->ops->read(ucb->ac97, reg);
}

static inline void ucb1400_reg_write(struct ucb1400 *ucb, u16 reg, u16 val)
{
	ucb->ac97->bus->ops->write(ucb->ac97, reg, val);
}

static inline void ucb1400_adc_enable(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA);
}

static unsigned int ucb1400_adc_read(struct ucb1400 *ucb, u16 adc_channel)
{
	unsigned int val;

	if (ucb->adcsync)
		adc_channel |= UCB_ADC_SYNC_ENA;

	ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
	ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | adc_channel | UCB_ADC_START);

	for (;;) {
		val = ucb1400_reg_read(ucb, UCB_ADC_DATA);
		if (val & UCB_ADC_DAT_VALID)
			break;
		/* yield to other processes */
		schedule_timeout_uninterruptible(1);
	}

	return UCB_ADC_DAT_VALUE(val);
}

static inline void ucb1400_adc_disable(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_ADC_CR, 0);
}

/* Switch to interrupt mode. */
static inline void ucb1400_ts_mode_int(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
			UCB_TS_CR_MODE_INT);
}

/*
 * Switch to pressure mode, and read pressure.  We don't need to wait
 * here, since both plates are being driven.
 */
static inline unsigned int ucb1400_ts_read_pressure(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	udelay(ts_delay_pressure);
	return ucb1400_adc_read(ucb, UCB_ADC_INP_TSPY);
}

/*
 * Switch to X position mode and measure Y plate.  We switch the plate
 * configuration in pressure mode, then switch to position mode.  This
 * gives a faster response time.  Even so, we need to wait about 55us
 * for things to stabilise.
 */
static inline unsigned int ucb1400_ts_read_xpos(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);

	udelay(ts_delay);

	return ucb1400_adc_read(ucb, UCB_ADC_INP_TSPY);
}

/*
 * Switch to Y position mode and measure X plate.  We switch the plate
 * configuration in pressure mode, then switch to position mode.  This
 * gives a faster response time.  Even so, we need to wait about 55us
 * for things to stabilise.
 */
static inline unsigned int ucb1400_ts_read_ypos(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);

	udelay(ts_delay);

	return ucb1400_adc_read(ucb, UCB_ADC_INP_TSPX);
}

/*
 * Switch to X plate resistance mode.  Set MX to ground, PX to
 * supply.  Measure current.
 */
static inline unsigned int ucb1400_ts_read_xres(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	return ucb1400_adc_read(ucb, 0);
}

/*
 * Switch to Y plate resistance mode.  Set MY to ground, PY to
 * supply.  Measure current.
 */
static inline unsigned int ucb1400_ts_read_yres(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	return ucb1400_adc_read(ucb, 0);
}

static inline int ucb1400_ts_pen_down(struct ucb1400 *ucb)
{
	unsigned short val = ucb1400_reg_read(ucb, UCB_TS_CR);
	return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW));
}

static inline void ucb1400_ts_irq_enable(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, UCB_IE_TSPX);
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);
	ucb1400_reg_write(ucb, UCB_IE_FAL, UCB_IE_TSPX);
}

static inline void ucb1400_ts_irq_disable(struct ucb1400 *ucb)
{
	ucb1400_reg_write(ucb, UCB_IE_FAL, 0);
}

static void ucb1400_ts_evt_add(struct input_dev *idev, u16 pressure, u16 x, u16 y)
{
	input_report_abs(idev, ABS_X, x);
	input_report_abs(idev, ABS_Y, y);
	input_report_abs(idev, ABS_PRESSURE, pressure);
	input_sync(idev);
}

static void ucb1400_ts_event_release(struct input_dev *idev)
{
	input_report_abs(idev, ABS_PRESSURE, 0);
	input_sync(idev);
}

static void ucb1400_handle_pending_irq(struct ucb1400 *ucb)
{
	unsigned int isr;

	isr = ucb1400_reg_read(ucb, UCB_IE_STATUS);
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, isr);
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);

	if (isr & UCB_IE_TSPX)
		ucb1400_ts_irq_disable(ucb);
	else
		printk(KERN_ERR "ucb1400: unexpected IE_STATUS = %#x\n", isr);

	enable_irq(ucb->irq);
}

static int ucb1400_ts_thread(void *_ucb)
{
	struct ucb1400 *ucb = _ucb;
	struct task_struct *tsk = current;
	int valid = 0;
	struct sched_param param = { .sched_priority = 1 };

	sched_setscheduler(tsk, SCHED_FIFO, &param);

	set_freezable();
	while (!kthread_should_stop()) {
		unsigned int x, y, p;
		long timeout;

		ucb->ts_restart = 0;

		if (ucb->irq_pending) {
			ucb->irq_pending = 0;
			ucb1400_handle_pending_irq(ucb);
		}

		ucb1400_adc_enable(ucb);
		x = ucb1400_ts_read_xpos(ucb);
		y = ucb1400_ts_read_ypos(ucb);
		p = ucb1400_ts_read_pressure(ucb);
		ucb1400_adc_disable(ucb);

		/* Switch back to interrupt mode. */
		ucb1400_ts_mode_int(ucb);

		msleep(10);

		if (ucb1400_ts_pen_down(ucb)) {
			ucb1400_ts_irq_enable(ucb);

			/*
			 * If we spat out a valid sample set last time,
			 * spit out a "pen off" sample here.
			 */
			if (valid) {
				ucb1400_ts_event_release(ucb->ts_idev);
				valid = 0;
			}

			timeout = MAX_SCHEDULE_TIMEOUT;
		} else {
			valid = 1;
			ucb1400_ts_evt_add(ucb->ts_idev, p, x, y);
			timeout = msecs_to_jiffies(10);
		}

		wait_event_freezable_timeout(ucb->ts_wait,
			ucb->irq_pending || ucb->ts_restart || kthread_should_stop(),
			timeout);
	}

	/* Send the "pen off" if we are stopping with the pen still active */
	if (valid)
		ucb1400_ts_event_release(ucb->ts_idev);

	ucb->ts_task = NULL;
	return 0;
}

/*
 * A restriction with interrupts exists when using the ucb1400, as
 * the codec read/write routines may sleep while waiting for codec
 * access completion and uses semaphores for access control to the
 * AC97 bus.  A complete codec read cycle could take  anywhere from
 * 60 to 100uSec so we *definitely* don't want to spin inside the
 * interrupt handler waiting for codec access.  So, we handle the
 * interrupt by scheduling a RT kernel thread to run in process
 * context instead of interrupt context.
 */
static irqreturn_t ucb1400_hard_irq(int irqnr, void *devid)
{
	struct ucb1400 *ucb = devid;

	if (irqnr == ucb->irq) {
		disable_irq(ucb->irq);
		ucb->irq_pending = 1;
		wake_up(&ucb->ts_wait);
		return IRQ_HANDLED;
	}
	return IRQ_NONE;
}

static int ucb1400_ts_open(struct input_dev *idev)
{
	struct ucb1400 *ucb = input_get_drvdata(idev);
	int ret = 0;

	BUG_ON(ucb->ts_task);

	ucb->ts_task = kthread_run(ucb1400_ts_thread, ucb, "UCB1400_ts");
	if (IS_ERR(ucb->ts_task)) {
		ret = PTR_ERR(ucb->ts_task);
		ucb->ts_task = NULL;
	}

	return ret;
}

static void ucb1400_ts_close(struct input_dev *idev)
{
	struct ucb1400 *ucb = input_get_drvdata(idev);

	if (ucb->ts_task)
		kthread_stop(ucb->ts_task);

	ucb1400_ts_irq_disable(ucb);
	ucb1400_reg_write(ucb, UCB_TS_CR, 0);
}

#ifdef CONFIG_PM
static int ucb1400_ts_resume(struct device *dev)
{
	struct ucb1400 *ucb = dev_get_drvdata(dev);

	if (ucb->ts_task) {
		/*
		 * Restart the TS thread to ensure the
		 * TS interrupt mode is set up again
		 * after sleep.
		 */
		ucb->ts_restart = 1;
		wake_up(&ucb->ts_wait);
	}
	return 0;
}
#else
#define ucb1400_ts_resume NULL
#endif

#ifndef NO_IRQ
#define NO_IRQ	0
#endif

/*
 * Try to probe our interrupt, rather than relying on lots of
 * hard-coded machine dependencies.
 */
static int ucb1400_detect_irq(struct ucb1400 *ucb)
{
	unsigned long mask, timeout;

	mask = probe_irq_on();
	if (!mask) {
		probe_irq_off(mask);
		return -EBUSY;
	}

	/* Enable the ADC interrupt. */
	ucb1400_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC);
	ucb1400_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC);
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);

	/* Cause an ADC interrupt. */
	ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA);
	ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);

	/* Wait for the conversion to complete. */
	timeout = jiffies + HZ/2;
	while (!(ucb1400_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VALID)) {
		cpu_relax();
		if (time_after(jiffies, timeout)) {
			printk(KERN_ERR "ucb1400: timed out in IRQ probe\n");
			probe_irq_off(mask);
			return -ENODEV;
		}
	}
	ucb1400_reg_write(ucb, UCB_ADC_CR, 0);

	/* Disable and clear interrupt. */
	ucb1400_reg_write(ucb, UCB_IE_RIS, 0);
	ucb1400_reg_write(ucb, UCB_IE_FAL, 0);
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0xffff);
	ucb1400_reg_write(ucb, UCB_IE_CLEAR, 0);

	/* Read triggered interrupt. */
	ucb->irq = probe_irq_off(mask);
	if (ucb->irq < 0 || ucb->irq == NO_IRQ)
		return -ENODEV;

	return 0;
}

static int ucb1400_ts_probe(struct device *dev)
{
	struct ucb1400 *ucb;
	struct input_dev *idev;
	int error, id, x_res, y_res;

	ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
	idev = input_allocate_device();
	if (!ucb || !idev) {
		error = -ENOMEM;
		goto err_free_devs;
	}

	ucb->ts_idev = idev;
	ucb->adcsync = adcsync;
	ucb->ac97 = to_ac97_t(dev);
	init_waitqueue_head(&ucb->ts_wait);

	id = ucb1400_reg_read(ucb, UCB_ID);
	if (id != UCB_ID_1400) {
		error = -ENODEV;
		goto err_free_devs;
	}

	error = ucb1400_detect_irq(ucb);
	if (error) {
		printk(KERN_ERR "UCB1400: IRQ probe failed\n");
		goto err_free_devs;
	}

	error = request_irq(ucb->irq, ucb1400_hard_irq, IRQF_TRIGGER_RISING,
				"UCB1400", ucb);
	if (error) {
		printk(KERN_ERR "ucb1400: unable to grab irq%d: %d\n",
				ucb->irq, error);
		goto err_free_devs;
	}
	printk(KERN_DEBUG "UCB1400: found IRQ %d\n", ucb->irq);

	input_set_drvdata(idev, ucb);

	idev->dev.parent	= dev;
	idev->name		= "UCB1400 touchscreen interface";
	idev->id.vendor		= ucb1400_reg_read(ucb, AC97_VENDOR_ID1);
	idev->id.product	= id;
	idev->open		= ucb1400_ts_open;
	idev->close		= ucb1400_ts_close;
	idev->evbit[0]		= BIT(EV_ABS);

	ucb1400_adc_enable(ucb);
	x_res = ucb1400_ts_read_xres(ucb);
	y_res = ucb1400_ts_read_yres(ucb);
	ucb1400_adc_disable(ucb);
	printk(KERN_DEBUG "UCB1400: x/y = %d/%d\n", x_res, y_res);

	input_set_abs_params(idev, ABS_X, 0, x_res, 0, 0);
	input_set_abs_params(idev, ABS_Y, 0, y_res, 0, 0);
	input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0);

	error = input_register_device(idev);
	if (error)
		goto err_free_irq;

	dev_set_drvdata(dev, ucb);
	return 0;

 err_free_irq:
	free_irq(ucb->irq, ucb);
 err_free_devs:
	input_free_device(idev);
	kfree(ucb);
	return error;
}

static int ucb1400_ts_remove(struct device *dev)
{
	struct ucb1400 *ucb = dev_get_drvdata(dev);

	free_irq(ucb->irq, ucb);
	input_unregister_device(ucb->ts_idev);
	dev_set_drvdata(dev, NULL);
	kfree(ucb);
	return 0;
}

static struct device_driver ucb1400_ts_driver = {
	.name		= "ucb1400_ts",
	.owner		= THIS_MODULE,
	.bus		= &ac97_bus_type,
	.probe		= ucb1400_ts_probe,
	.remove		= ucb1400_ts_remove,
	.resume		= ucb1400_ts_resume,
};

static int __init ucb1400_ts_init(void)
{
	return driver_register(&ucb1400_ts_driver);
}

static void __exit ucb1400_ts_exit(void)
{
	driver_unregister(&ucb1400_ts_driver);
}

module_param(adcsync, bool, 0444);
MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin.");

module_param(ts_delay, int, 0444);
MODULE_PARM_DESC(ts_delay, "Delay between panel setup and position read. Default = 55us.");

module_param(ts_delay_pressure, int, 0444);
MODULE_PARM_DESC(ts_delay_pressure,
		  "delay between panel setup and pressure read.  Default = 0us.");

module_init(ucb1400_ts_init);
module_exit(ucb1400_ts_exit);

MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
MODULE_LICENSE("GPL");