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10#include <linux/acpi.h>
11#include <linux/i2c.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/regmap.h>
16#include <linux/iio/events.h>
17#include <linux/iio/iio.h>
18#include <linux/iio/sysfs.h>
19
20#define STK3310_REG_STATE 0x00
21#define STK3310_REG_PSCTRL 0x01
22#define STK3310_REG_ALSCTRL 0x02
23#define STK3310_REG_INT 0x04
24#define STK3310_REG_THDH_PS 0x06
25#define STK3310_REG_THDL_PS 0x08
26#define STK3310_REG_FLAG 0x10
27#define STK3310_REG_PS_DATA_MSB 0x11
28#define STK3310_REG_PS_DATA_LSB 0x12
29#define STK3310_REG_ALS_DATA_MSB 0x13
30#define STK3310_REG_ALS_DATA_LSB 0x14
31#define STK3310_REG_ID 0x3E
32#define STK3310_MAX_REG 0x80
33
34#define STK3310_STATE_EN_PS BIT(0)
35#define STK3310_STATE_EN_ALS BIT(1)
36#define STK3310_STATE_STANDBY 0x00
37
38#define STK3310_CHIP_ID_VAL 0x13
39#define STK3311_CHIP_ID_VAL 0x1D
40#define STK3311X_CHIP_ID_VAL 0x12
41#define STK3335_CHIP_ID_VAL 0x51
42#define STK3310_PSINT_EN 0x01
43#define STK3310_PS_MAX_VAL 0xFFFF
44
45#define STK3310_DRIVER_NAME "stk3310"
46#define STK3310_REGMAP_NAME "stk3310_regmap"
47#define STK3310_EVENT "stk3310_event"
48
49#define STK3310_SCALE_AVAILABLE "6.4 1.6 0.4 0.1"
50
51#define STK3310_IT_AVAILABLE \
52 "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
53 "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
54 "3.031040 6.062080"
55
56#define STK3310_REGFIELD(name) \
57 do { \
58 data->reg_##name = \
59 devm_regmap_field_alloc(&client->dev, regmap, \
60 stk3310_reg_field_##name); \
61 if (IS_ERR(data->reg_##name)) { \
62 dev_err(&client->dev, "reg field alloc failed.\n"); \
63 return PTR_ERR(data->reg_##name); \
64 } \
65 } while (0)
66
67static const struct reg_field stk3310_reg_field_state =
68 REG_FIELD(STK3310_REG_STATE, 0, 2);
69static const struct reg_field stk3310_reg_field_als_gain =
70 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
71static const struct reg_field stk3310_reg_field_ps_gain =
72 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
73static const struct reg_field stk3310_reg_field_als_it =
74 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
75static const struct reg_field stk3310_reg_field_ps_it =
76 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
77static const struct reg_field stk3310_reg_field_int_ps =
78 REG_FIELD(STK3310_REG_INT, 0, 2);
79static const struct reg_field stk3310_reg_field_flag_psint =
80 REG_FIELD(STK3310_REG_FLAG, 4, 4);
81static const struct reg_field stk3310_reg_field_flag_nf =
82 REG_FIELD(STK3310_REG_FLAG, 0, 0);
83
84
85static const int stk3310_ps_max[4] = {
86 STK3310_PS_MAX_VAL / 640,
87 STK3310_PS_MAX_VAL / 160,
88 STK3310_PS_MAX_VAL / 40,
89 STK3310_PS_MAX_VAL / 10
90};
91
92static const int stk3310_scale_table[][2] = {
93 {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
94};
95
96
97static const int stk3310_it_table[][2] = {
98 {0, 185}, {0, 370}, {0, 741}, {0, 1480},
99 {0, 2960}, {0, 5920}, {0, 11840}, {0, 23680},
100 {0, 47360}, {0, 94720}, {0, 189440}, {0, 378880},
101 {0, 757760}, {1, 515520}, {3, 31040}, {6, 62080},
102};
103
104struct stk3310_data {
105 struct i2c_client *client;
106 struct mutex lock;
107 bool als_enabled;
108 bool ps_enabled;
109 u64 timestamp;
110 struct regmap *regmap;
111 struct regmap_field *reg_state;
112 struct regmap_field *reg_als_gain;
113 struct regmap_field *reg_ps_gain;
114 struct regmap_field *reg_als_it;
115 struct regmap_field *reg_ps_it;
116 struct regmap_field *reg_int_ps;
117 struct regmap_field *reg_flag_psint;
118 struct regmap_field *reg_flag_nf;
119};
120
121static const struct iio_event_spec stk3310_events[] = {
122
123 {
124 .type = IIO_EV_TYPE_THRESH,
125 .dir = IIO_EV_DIR_RISING,
126 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
127 BIT(IIO_EV_INFO_ENABLE),
128 },
129
130 {
131 .type = IIO_EV_TYPE_THRESH,
132 .dir = IIO_EV_DIR_FALLING,
133 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
134 BIT(IIO_EV_INFO_ENABLE),
135 },
136};
137
138static const struct iio_chan_spec stk3310_channels[] = {
139 {
140 .type = IIO_LIGHT,
141 .info_mask_separate =
142 BIT(IIO_CHAN_INFO_RAW) |
143 BIT(IIO_CHAN_INFO_SCALE) |
144 BIT(IIO_CHAN_INFO_INT_TIME),
145 },
146 {
147 .type = IIO_PROXIMITY,
148 .info_mask_separate =
149 BIT(IIO_CHAN_INFO_RAW) |
150 BIT(IIO_CHAN_INFO_SCALE) |
151 BIT(IIO_CHAN_INFO_INT_TIME),
152 .event_spec = stk3310_events,
153 .num_event_specs = ARRAY_SIZE(stk3310_events),
154 }
155};
156
157static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
158
159static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
160
161static IIO_CONST_ATTR(in_illuminance_integration_time_available,
162 STK3310_IT_AVAILABLE);
163
164static IIO_CONST_ATTR(in_proximity_integration_time_available,
165 STK3310_IT_AVAILABLE);
166
167static struct attribute *stk3310_attributes[] = {
168 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
169 &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
170 &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
171 &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
172 NULL,
173};
174
175static const struct attribute_group stk3310_attribute_group = {
176 .attrs = stk3310_attributes
177};
178
179static int stk3310_get_index(const int table[][2], int table_size,
180 int val, int val2)
181{
182 int i;
183
184 for (i = 0; i < table_size; i++) {
185 if (val == table[i][0] && val2 == table[i][1])
186 return i;
187 }
188
189 return -EINVAL;
190}
191
192static int stk3310_read_event(struct iio_dev *indio_dev,
193 const struct iio_chan_spec *chan,
194 enum iio_event_type type,
195 enum iio_event_direction dir,
196 enum iio_event_info info,
197 int *val, int *val2)
198{
199 u8 reg;
200 __be16 buf;
201 int ret;
202 struct stk3310_data *data = iio_priv(indio_dev);
203
204 if (info != IIO_EV_INFO_VALUE)
205 return -EINVAL;
206
207
208 if (dir == IIO_EV_DIR_RISING)
209 reg = STK3310_REG_THDH_PS;
210 else if (dir == IIO_EV_DIR_FALLING)
211 reg = STK3310_REG_THDL_PS;
212 else
213 return -EINVAL;
214
215 mutex_lock(&data->lock);
216 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
217 mutex_unlock(&data->lock);
218 if (ret < 0) {
219 dev_err(&data->client->dev, "register read failed\n");
220 return ret;
221 }
222 *val = be16_to_cpu(buf);
223
224 return IIO_VAL_INT;
225}
226
227static int stk3310_write_event(struct iio_dev *indio_dev,
228 const struct iio_chan_spec *chan,
229 enum iio_event_type type,
230 enum iio_event_direction dir,
231 enum iio_event_info info,
232 int val, int val2)
233{
234 u8 reg;
235 __be16 buf;
236 int ret;
237 unsigned int index;
238 struct stk3310_data *data = iio_priv(indio_dev);
239 struct i2c_client *client = data->client;
240
241 ret = regmap_field_read(data->reg_ps_gain, &index);
242 if (ret < 0)
243 return ret;
244
245 if (val < 0 || val > stk3310_ps_max[index])
246 return -EINVAL;
247
248 if (dir == IIO_EV_DIR_RISING)
249 reg = STK3310_REG_THDH_PS;
250 else if (dir == IIO_EV_DIR_FALLING)
251 reg = STK3310_REG_THDL_PS;
252 else
253 return -EINVAL;
254
255 buf = cpu_to_be16(val);
256 ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
257 if (ret < 0)
258 dev_err(&client->dev, "failed to set PS threshold!\n");
259
260 return ret;
261}
262
263static int stk3310_read_event_config(struct iio_dev *indio_dev,
264 const struct iio_chan_spec *chan,
265 enum iio_event_type type,
266 enum iio_event_direction dir)
267{
268 unsigned int event_val;
269 int ret;
270 struct stk3310_data *data = iio_priv(indio_dev);
271
272 ret = regmap_field_read(data->reg_int_ps, &event_val);
273 if (ret < 0)
274 return ret;
275
276 return event_val;
277}
278
279static int stk3310_write_event_config(struct iio_dev *indio_dev,
280 const struct iio_chan_spec *chan,
281 enum iio_event_type type,
282 enum iio_event_direction dir,
283 int state)
284{
285 int ret;
286 struct stk3310_data *data = iio_priv(indio_dev);
287 struct i2c_client *client = data->client;
288
289 if (state < 0 || state > 7)
290 return -EINVAL;
291
292
293 mutex_lock(&data->lock);
294 ret = regmap_field_write(data->reg_int_ps, state);
295 if (ret < 0)
296 dev_err(&client->dev, "failed to set interrupt mode\n");
297 mutex_unlock(&data->lock);
298
299 return ret;
300}
301
302static int stk3310_read_raw(struct iio_dev *indio_dev,
303 struct iio_chan_spec const *chan,
304 int *val, int *val2, long mask)
305{
306 u8 reg;
307 __be16 buf;
308 int ret;
309 unsigned int index;
310 struct stk3310_data *data = iio_priv(indio_dev);
311 struct i2c_client *client = data->client;
312
313 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
314 return -EINVAL;
315
316 switch (mask) {
317 case IIO_CHAN_INFO_RAW:
318 if (chan->type == IIO_LIGHT)
319 reg = STK3310_REG_ALS_DATA_MSB;
320 else
321 reg = STK3310_REG_PS_DATA_MSB;
322
323 mutex_lock(&data->lock);
324 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
325 if (ret < 0) {
326 dev_err(&client->dev, "register read failed\n");
327 mutex_unlock(&data->lock);
328 return ret;
329 }
330 *val = be16_to_cpu(buf);
331 mutex_unlock(&data->lock);
332 return IIO_VAL_INT;
333 case IIO_CHAN_INFO_INT_TIME:
334 if (chan->type == IIO_LIGHT)
335 ret = regmap_field_read(data->reg_als_it, &index);
336 else
337 ret = regmap_field_read(data->reg_ps_it, &index);
338 if (ret < 0)
339 return ret;
340
341 *val = stk3310_it_table[index][0];
342 *val2 = stk3310_it_table[index][1];
343 return IIO_VAL_INT_PLUS_MICRO;
344 case IIO_CHAN_INFO_SCALE:
345 if (chan->type == IIO_LIGHT)
346 ret = regmap_field_read(data->reg_als_gain, &index);
347 else
348 ret = regmap_field_read(data->reg_ps_gain, &index);
349 if (ret < 0)
350 return ret;
351
352 *val = stk3310_scale_table[index][0];
353 *val2 = stk3310_scale_table[index][1];
354 return IIO_VAL_INT_PLUS_MICRO;
355 }
356
357 return -EINVAL;
358}
359
360static int stk3310_write_raw(struct iio_dev *indio_dev,
361 struct iio_chan_spec const *chan,
362 int val, int val2, long mask)
363{
364 int ret;
365 int index;
366 struct stk3310_data *data = iio_priv(indio_dev);
367
368 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
369 return -EINVAL;
370
371 switch (mask) {
372 case IIO_CHAN_INFO_INT_TIME:
373 index = stk3310_get_index(stk3310_it_table,
374 ARRAY_SIZE(stk3310_it_table),
375 val, val2);
376 if (index < 0)
377 return -EINVAL;
378 mutex_lock(&data->lock);
379 if (chan->type == IIO_LIGHT)
380 ret = regmap_field_write(data->reg_als_it, index);
381 else
382 ret = regmap_field_write(data->reg_ps_it, index);
383 if (ret < 0)
384 dev_err(&data->client->dev,
385 "sensor configuration failed\n");
386 mutex_unlock(&data->lock);
387 return ret;
388
389 case IIO_CHAN_INFO_SCALE:
390 index = stk3310_get_index(stk3310_scale_table,
391 ARRAY_SIZE(stk3310_scale_table),
392 val, val2);
393 if (index < 0)
394 return -EINVAL;
395 mutex_lock(&data->lock);
396 if (chan->type == IIO_LIGHT)
397 ret = regmap_field_write(data->reg_als_gain, index);
398 else
399 ret = regmap_field_write(data->reg_ps_gain, index);
400 if (ret < 0)
401 dev_err(&data->client->dev,
402 "sensor configuration failed\n");
403 mutex_unlock(&data->lock);
404 return ret;
405 }
406
407 return -EINVAL;
408}
409
410static const struct iio_info stk3310_info = {
411 .read_raw = stk3310_read_raw,
412 .write_raw = stk3310_write_raw,
413 .attrs = &stk3310_attribute_group,
414 .read_event_value = stk3310_read_event,
415 .write_event_value = stk3310_write_event,
416 .read_event_config = stk3310_read_event_config,
417 .write_event_config = stk3310_write_event_config,
418};
419
420static int stk3310_set_state(struct stk3310_data *data, u8 state)
421{
422 int ret;
423 struct i2c_client *client = data->client;
424
425
426 if (state > 7 || state == 4)
427 return -EINVAL;
428
429 mutex_lock(&data->lock);
430 ret = regmap_field_write(data->reg_state, state);
431 if (ret < 0) {
432 dev_err(&client->dev, "failed to change sensor state\n");
433 } else if (state != STK3310_STATE_STANDBY) {
434
435 data->ps_enabled = !!(state & STK3310_STATE_EN_PS);
436 data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
437 }
438 mutex_unlock(&data->lock);
439
440 return ret;
441}
442
443static int stk3310_init(struct iio_dev *indio_dev)
444{
445 int ret;
446 int chipid;
447 u8 state;
448 struct stk3310_data *data = iio_priv(indio_dev);
449 struct i2c_client *client = data->client;
450
451 ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
452 if (ret < 0)
453 return ret;
454
455 if (chipid != STK3310_CHIP_ID_VAL &&
456 chipid != STK3311_CHIP_ID_VAL &&
457 chipid != STK3311X_CHIP_ID_VAL &&
458 chipid != STK3335_CHIP_ID_VAL) {
459 dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
460 return -ENODEV;
461 }
462
463 state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
464 ret = stk3310_set_state(data, state);
465 if (ret < 0) {
466 dev_err(&client->dev, "failed to enable sensor");
467 return ret;
468 }
469
470
471 ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
472 if (ret < 0)
473 dev_err(&client->dev, "failed to enable interrupts!\n");
474
475 return ret;
476}
477
478static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
479{
480 switch (reg) {
481 case STK3310_REG_ALS_DATA_MSB:
482 case STK3310_REG_ALS_DATA_LSB:
483 case STK3310_REG_PS_DATA_LSB:
484 case STK3310_REG_PS_DATA_MSB:
485 case STK3310_REG_FLAG:
486 return true;
487 default:
488 return false;
489 }
490}
491
492static const struct regmap_config stk3310_regmap_config = {
493 .name = STK3310_REGMAP_NAME,
494 .reg_bits = 8,
495 .val_bits = 8,
496 .max_register = STK3310_MAX_REG,
497 .cache_type = REGCACHE_RBTREE,
498 .volatile_reg = stk3310_is_volatile_reg,
499};
500
501static int stk3310_regmap_init(struct stk3310_data *data)
502{
503 struct regmap *regmap;
504 struct i2c_client *client;
505
506 client = data->client;
507 regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
508 if (IS_ERR(regmap)) {
509 dev_err(&client->dev, "regmap initialization failed.\n");
510 return PTR_ERR(regmap);
511 }
512 data->regmap = regmap;
513
514 STK3310_REGFIELD(state);
515 STK3310_REGFIELD(als_gain);
516 STK3310_REGFIELD(ps_gain);
517 STK3310_REGFIELD(als_it);
518 STK3310_REGFIELD(ps_it);
519 STK3310_REGFIELD(int_ps);
520 STK3310_REGFIELD(flag_psint);
521 STK3310_REGFIELD(flag_nf);
522
523 return 0;
524}
525
526static irqreturn_t stk3310_irq_handler(int irq, void *private)
527{
528 struct iio_dev *indio_dev = private;
529 struct stk3310_data *data = iio_priv(indio_dev);
530
531 data->timestamp = iio_get_time_ns(indio_dev);
532
533 return IRQ_WAKE_THREAD;
534}
535
536static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
537{
538 int ret;
539 unsigned int dir;
540 u64 event;
541
542 struct iio_dev *indio_dev = private;
543 struct stk3310_data *data = iio_priv(indio_dev);
544
545
546 mutex_lock(&data->lock);
547 ret = regmap_field_read(data->reg_flag_nf, &dir);
548 if (ret < 0) {
549 dev_err(&data->client->dev, "register read failed\n");
550 mutex_unlock(&data->lock);
551 return ret;
552 }
553 event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
554 IIO_EV_TYPE_THRESH,
555 (dir ? IIO_EV_DIR_FALLING :
556 IIO_EV_DIR_RISING));
557 iio_push_event(indio_dev, event, data->timestamp);
558
559
560 ret = regmap_field_write(data->reg_flag_psint, 0);
561 if (ret < 0)
562 dev_err(&data->client->dev, "failed to reset interrupts\n");
563 mutex_unlock(&data->lock);
564
565 return IRQ_HANDLED;
566}
567
568static int stk3310_probe(struct i2c_client *client,
569 const struct i2c_device_id *id)
570{
571 int ret;
572 struct iio_dev *indio_dev;
573 struct stk3310_data *data;
574
575 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
576 if (!indio_dev) {
577 dev_err(&client->dev, "iio allocation failed!\n");
578 return -ENOMEM;
579 }
580
581 data = iio_priv(indio_dev);
582 data->client = client;
583 i2c_set_clientdata(client, indio_dev);
584 mutex_init(&data->lock);
585
586 ret = stk3310_regmap_init(data);
587 if (ret < 0)
588 return ret;
589
590 indio_dev->info = &stk3310_info;
591 indio_dev->name = STK3310_DRIVER_NAME;
592 indio_dev->modes = INDIO_DIRECT_MODE;
593 indio_dev->channels = stk3310_channels;
594 indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
595
596 ret = stk3310_init(indio_dev);
597 if (ret < 0)
598 return ret;
599
600 if (client->irq > 0) {
601 ret = devm_request_threaded_irq(&client->dev, client->irq,
602 stk3310_irq_handler,
603 stk3310_irq_event_handler,
604 IRQF_TRIGGER_FALLING |
605 IRQF_ONESHOT,
606 STK3310_EVENT, indio_dev);
607 if (ret < 0) {
608 dev_err(&client->dev, "request irq %d failed\n",
609 client->irq);
610 goto err_standby;
611 }
612 }
613
614 ret = iio_device_register(indio_dev);
615 if (ret < 0) {
616 dev_err(&client->dev, "device_register failed\n");
617 goto err_standby;
618 }
619
620 return 0;
621
622err_standby:
623 stk3310_set_state(data, STK3310_STATE_STANDBY);
624 return ret;
625}
626
627static int stk3310_remove(struct i2c_client *client)
628{
629 struct iio_dev *indio_dev = i2c_get_clientdata(client);
630
631 iio_device_unregister(indio_dev);
632 return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
633}
634
635#ifdef CONFIG_PM_SLEEP
636static int stk3310_suspend(struct device *dev)
637{
638 struct stk3310_data *data;
639
640 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
641
642 return stk3310_set_state(data, STK3310_STATE_STANDBY);
643}
644
645static int stk3310_resume(struct device *dev)
646{
647 u8 state = 0;
648 struct stk3310_data *data;
649
650 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
651 if (data->ps_enabled)
652 state |= STK3310_STATE_EN_PS;
653 if (data->als_enabled)
654 state |= STK3310_STATE_EN_ALS;
655
656 return stk3310_set_state(data, state);
657}
658
659static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
660
661#define STK3310_PM_OPS (&stk3310_pm_ops)
662#else
663#define STK3310_PM_OPS NULL
664#endif
665
666static const struct i2c_device_id stk3310_i2c_id[] = {
667 {"STK3310", 0},
668 {"STK3311", 0},
669 {"STK3335", 0},
670 {}
671};
672MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
673
674static const struct acpi_device_id stk3310_acpi_id[] = {
675 {"STK3310", 0},
676 {"STK3311", 0},
677 {"STK3335", 0},
678 {}
679};
680
681MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
682
683static const struct of_device_id stk3310_of_match[] = {
684 { .compatible = "sensortek,stk3310", },
685 { .compatible = "sensortek,stk3311", },
686 { .compatible = "sensortek,stk3335", },
687 {}
688};
689MODULE_DEVICE_TABLE(of, stk3310_of_match);
690
691static struct i2c_driver stk3310_driver = {
692 .driver = {
693 .name = "stk3310",
694 .of_match_table = stk3310_of_match,
695 .pm = STK3310_PM_OPS,
696 .acpi_match_table = ACPI_PTR(stk3310_acpi_id),
697 },
698 .probe = stk3310_probe,
699 .remove = stk3310_remove,
700 .id_table = stk3310_i2c_id,
701};
702
703module_i2c_driver(stk3310_driver);
704
705MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
706MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
707MODULE_LICENSE("GPL v2");
708
