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6
7#include <linux/kernel.h>
8#include <linux/delay.h>
9#include <linux/interrupt.h>
10#include <linux/i2c.h>
11#include <linux/workqueue.h>
12#include <linux/input.h>
13#include <linux/input/bu21013.h>
14#include <linux/slab.h>
15#include <linux/regulator/consumer.h>
16
17#define PEN_DOWN_INTR 0
18#define MAX_FINGERS 2
19#define RESET_DELAY 30
20#define PENUP_TIMEOUT (10)
21#define DELTA_MIN 16
22#define MASK_BITS 0x03
23#define SHIFT_8 8
24#define SHIFT_2 2
25#define LENGTH_OF_BUFFER 11
26#define I2C_RETRY_COUNT 5
27
28#define BU21013_SENSORS_BTN_0_7_REG 0x70
29#define BU21013_SENSORS_BTN_8_15_REG 0x71
30#define BU21013_SENSORS_BTN_16_23_REG 0x72
31#define BU21013_X1_POS_MSB_REG 0x73
32#define BU21013_X1_POS_LSB_REG 0x74
33#define BU21013_Y1_POS_MSB_REG 0x75
34#define BU21013_Y1_POS_LSB_REG 0x76
35#define BU21013_X2_POS_MSB_REG 0x77
36#define BU21013_X2_POS_LSB_REG 0x78
37#define BU21013_Y2_POS_MSB_REG 0x79
38#define BU21013_Y2_POS_LSB_REG 0x7A
39#define BU21013_INT_CLR_REG 0xE8
40#define BU21013_INT_MODE_REG 0xE9
41#define BU21013_GAIN_REG 0xEA
42#define BU21013_OFFSET_MODE_REG 0xEB
43#define BU21013_XY_EDGE_REG 0xEC
44#define BU21013_RESET_REG 0xED
45#define BU21013_CALIB_REG 0xEE
46#define BU21013_DONE_REG 0xEF
47#define BU21013_SENSOR_0_7_REG 0xF0
48#define BU21013_SENSOR_8_15_REG 0xF1
49#define BU21013_SENSOR_16_23_REG 0xF2
50#define BU21013_POS_MODE1_REG 0xF3
51#define BU21013_POS_MODE2_REG 0xF4
52#define BU21013_CLK_MODE_REG 0xF5
53#define BU21013_IDLE_REG 0xFA
54#define BU21013_FILTER_REG 0xFB
55#define BU21013_TH_ON_REG 0xFC
56#define BU21013_TH_OFF_REG 0xFD
57
58
59#define BU21013_RESET_ENABLE 0x01
60
61#define BU21013_SENSORS_EN_0_7 0x3F
62#define BU21013_SENSORS_EN_8_15 0xFC
63#define BU21013_SENSORS_EN_16_23 0x1F
64
65#define BU21013_POS_MODE1_0 0x02
66#define BU21013_POS_MODE1_1 0x04
67#define BU21013_POS_MODE1_2 0x08
68
69#define BU21013_POS_MODE2_ZERO 0x01
70#define BU21013_POS_MODE2_AVG1 0x02
71#define BU21013_POS_MODE2_AVG2 0x04
72#define BU21013_POS_MODE2_EN_XY 0x08
73#define BU21013_POS_MODE2_EN_RAW 0x10
74#define BU21013_POS_MODE2_MULTI 0x80
75
76#define BU21013_CLK_MODE_DIV 0x01
77#define BU21013_CLK_MODE_EXT 0x02
78#define BU21013_CLK_MODE_CALIB 0x80
79
80#define BU21013_IDLET_0 0x01
81#define BU21013_IDLET_1 0x02
82#define BU21013_IDLET_2 0x04
83#define BU21013_IDLET_3 0x08
84#define BU21013_IDLE_INTERMIT_EN 0x10
85
86#define BU21013_DELTA_0_6 0x7F
87#define BU21013_FILTER_EN 0x80
88
89#define BU21013_INT_MODE_LEVEL 0x00
90#define BU21013_INT_MODE_EDGE 0x01
91
92#define BU21013_GAIN_0 0x01
93#define BU21013_GAIN_1 0x02
94#define BU21013_GAIN_2 0x04
95
96#define BU21013_OFFSET_MODE_DEFAULT 0x00
97#define BU21013_OFFSET_MODE_MOVE 0x01
98#define BU21013_OFFSET_MODE_DISABLE 0x02
99
100#define BU21013_TH_ON_0 0x01
101#define BU21013_TH_ON_1 0x02
102#define BU21013_TH_ON_2 0x04
103#define BU21013_TH_ON_3 0x08
104#define BU21013_TH_ON_4 0x10
105#define BU21013_TH_ON_5 0x20
106#define BU21013_TH_ON_6 0x40
107#define BU21013_TH_ON_7 0x80
108#define BU21013_TH_ON_MAX 0xFF
109
110#define BU21013_TH_OFF_0 0x01
111#define BU21013_TH_OFF_1 0x02
112#define BU21013_TH_OFF_2 0x04
113#define BU21013_TH_OFF_3 0x08
114#define BU21013_TH_OFF_4 0x10
115#define BU21013_TH_OFF_5 0x20
116#define BU21013_TH_OFF_6 0x40
117#define BU21013_TH_OFF_7 0x80
118#define BU21013_TH_OFF_MAX 0xFF
119
120#define BU21013_X_EDGE_0 0x01
121#define BU21013_X_EDGE_1 0x02
122#define BU21013_X_EDGE_2 0x04
123#define BU21013_X_EDGE_3 0x08
124#define BU21013_Y_EDGE_0 0x10
125#define BU21013_Y_EDGE_1 0x20
126#define BU21013_Y_EDGE_2 0x40
127#define BU21013_Y_EDGE_3 0x80
128
129#define BU21013_DONE 0x01
130#define BU21013_NUMBER_OF_X_SENSORS (6)
131#define BU21013_NUMBER_OF_Y_SENSORS (11)
132
133#define DRIVER_TP "bu21013_tp"
134
135
136
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141
142
143
144
145
146
147struct bu21013_ts_data {
148 struct i2c_client *client;
149 wait_queue_head_t wait;
150 bool touch_stopped;
151 const struct bu21013_platform_device *chip;
152 struct input_dev *in_dev;
153 unsigned int intr_pin;
154 struct regulator *regulator;
155};
156
157
158
159
160
161
162
163
164
165static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf)
166{
167 int ret, i;
168
169 for (i = 0; i < I2C_RETRY_COUNT; i++) {
170 ret = i2c_smbus_read_i2c_block_data
171 (data->client, BU21013_SENSORS_BTN_0_7_REG,
172 LENGTH_OF_BUFFER, buf);
173 if (ret == LENGTH_OF_BUFFER)
174 return 0;
175 }
176 return -EINVAL;
177}
178
179
180
181
182
183
184
185
186static int bu21013_do_touch_report(struct bu21013_ts_data *data)
187{
188 u8 buf[LENGTH_OF_BUFFER];
189 unsigned int pos_x[2], pos_y[2];
190 bool has_x_sensors, has_y_sensors;
191 int finger_down_count = 0;
192 int i;
193
194 if (data == NULL)
195 return -EINVAL;
196
197 if (bu21013_read_block_data(data, buf) < 0)
198 return -EINVAL;
199
200 has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
201 has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
202 ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
203 if (!has_x_sensors || !has_y_sensors)
204 return 0;
205
206 for (i = 0; i < MAX_FINGERS; i++) {
207 const u8 *p = &buf[4 * i + 3];
208 unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS);
209 unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS);
210 if (x == 0 || y == 0)
211 continue;
212 pos_x[finger_down_count] = x;
213 pos_y[finger_down_count] = y;
214 finger_down_count++;
215 }
216
217 if (finger_down_count) {
218 if (finger_down_count == 2 &&
219 (abs(pos_x[0] - pos_x[1]) < DELTA_MIN ||
220 abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) {
221 return 0;
222 }
223
224 for (i = 0; i < finger_down_count; i++) {
225 if (data->chip->x_flip)
226 pos_x[i] = data->chip->touch_x_max - pos_x[i];
227 if (data->chip->y_flip)
228 pos_y[i] = data->chip->touch_y_max - pos_y[i];
229
230 input_report_abs(data->in_dev,
231 ABS_MT_POSITION_X, pos_x[i]);
232 input_report_abs(data->in_dev,
233 ABS_MT_POSITION_Y, pos_y[i]);
234 input_mt_sync(data->in_dev);
235 }
236 } else
237 input_mt_sync(data->in_dev);
238
239 input_sync(data->in_dev);
240
241 return 0;
242}
243
244
245
246
247
248
249
250
251static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
252{
253 struct bu21013_ts_data *data = device_data;
254 struct i2c_client *i2c = data->client;
255 int retval;
256
257 do {
258 retval = bu21013_do_touch_report(data);
259 if (retval < 0) {
260 dev_err(&i2c->dev, "bu21013_do_touch_report failed\n");
261 return IRQ_NONE;
262 }
263
264 data->intr_pin = data->chip->irq_read_val();
265 if (data->intr_pin == PEN_DOWN_INTR)
266 wait_event_timeout(data->wait, data->touch_stopped,
267 msecs_to_jiffies(2));
268 } while (!data->intr_pin && !data->touch_stopped);
269
270 return IRQ_HANDLED;
271}
272
273
274
275
276
277
278
279
280static int bu21013_init_chip(struct bu21013_ts_data *data)
281{
282 int retval;
283 struct i2c_client *i2c = data->client;
284
285 retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG,
286 BU21013_RESET_ENABLE);
287 if (retval < 0) {
288 dev_err(&i2c->dev, "BU21013_RESET reg write failed\n");
289 return retval;
290 }
291 msleep(RESET_DELAY);
292
293 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG,
294 BU21013_SENSORS_EN_0_7);
295 if (retval < 0) {
296 dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n");
297 return retval;
298 }
299
300 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG,
301 BU21013_SENSORS_EN_8_15);
302 if (retval < 0) {
303 dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n");
304 return retval;
305 }
306
307 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG,
308 BU21013_SENSORS_EN_16_23);
309 if (retval < 0) {
310 dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n");
311 return retval;
312 }
313
314 retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG,
315 (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1));
316 if (retval < 0) {
317 dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n");
318 return retval;
319 }
320
321 retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG,
322 (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 |
323 BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW |
324 BU21013_POS_MODE2_MULTI));
325 if (retval < 0) {
326 dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n");
327 return retval;
328 }
329
330 if (data->chip->ext_clk)
331 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
332 (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB));
333 else
334 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
335 (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB));
336 if (retval < 0) {
337 dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n");
338 return retval;
339 }
340
341 retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG,
342 (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN));
343 if (retval < 0) {
344 dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n");
345 return retval;
346 }
347
348 retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG,
349 BU21013_INT_MODE_LEVEL);
350 if (retval < 0) {
351 dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n");
352 return retval;
353 }
354
355 retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG,
356 (BU21013_DELTA_0_6 |
357 BU21013_FILTER_EN));
358 if (retval < 0) {
359 dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n");
360 return retval;
361 }
362
363 retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG,
364 BU21013_TH_ON_5);
365 if (retval < 0) {
366 dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n");
367 return retval;
368 }
369
370 retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG,
371 BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
372 if (retval < 0) {
373 dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n");
374 return retval;
375 }
376
377 retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG,
378 (BU21013_GAIN_0 | BU21013_GAIN_1));
379 if (retval < 0) {
380 dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n");
381 return retval;
382 }
383
384 retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG,
385 BU21013_OFFSET_MODE_DEFAULT);
386 if (retval < 0) {
387 dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n");
388 return retval;
389 }
390
391 retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG,
392 (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 |
393 BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3));
394 if (retval < 0) {
395 dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n");
396 return retval;
397 }
398
399 retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG,
400 BU21013_DONE);
401 if (retval < 0) {
402 dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n");
403 return retval;
404 }
405
406 return 0;
407}
408
409
410
411
412
413
414
415
416static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
417{
418 bu21013_data->touch_stopped = true;
419 wake_up(&bu21013_data->wait);
420 free_irq(bu21013_data->chip->irq, bu21013_data);
421}
422
423
424
425
426
427
428
429
430
431static int __devinit bu21013_probe(struct i2c_client *client,
432 const struct i2c_device_id *id)
433{
434 struct bu21013_ts_data *bu21013_data;
435 struct input_dev *in_dev;
436 const struct bu21013_platform_device *pdata =
437 client->dev.platform_data;
438 int error;
439
440 if (!i2c_check_functionality(client->adapter,
441 I2C_FUNC_SMBUS_BYTE_DATA)) {
442 dev_err(&client->dev, "i2c smbus byte data not supported\n");
443 return -EIO;
444 }
445
446 if (!pdata) {
447 dev_err(&client->dev, "platform data not defined\n");
448 return -EINVAL;
449 }
450
451 bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
452 in_dev = input_allocate_device();
453 if (!bu21013_data || !in_dev) {
454 dev_err(&client->dev, "device memory alloc failed\n");
455 error = -ENOMEM;
456 goto err_free_mem;
457 }
458
459 bu21013_data->in_dev = in_dev;
460 bu21013_data->chip = pdata;
461 bu21013_data->client = client;
462
463 bu21013_data->regulator = regulator_get(&client->dev, "V-TOUCH");
464 if (IS_ERR(bu21013_data->regulator)) {
465 dev_err(&client->dev, "regulator_get failed\n");
466 error = PTR_ERR(bu21013_data->regulator);
467 goto err_free_mem;
468 }
469
470 error = regulator_enable(bu21013_data->regulator);
471 if (error < 0) {
472 dev_err(&client->dev, "regulator enable failed\n");
473 goto err_put_regulator;
474 }
475
476 bu21013_data->touch_stopped = false;
477 init_waitqueue_head(&bu21013_data->wait);
478
479
480 if (pdata->cs_en) {
481 error = pdata->cs_en(pdata->cs_pin);
482 if (error < 0) {
483 dev_err(&client->dev, "chip init failed\n");
484 goto err_disable_regulator;
485 }
486 }
487
488
489 error = bu21013_init_chip(bu21013_data);
490 if (error) {
491 dev_err(&client->dev, "error in bu21013 config\n");
492 goto err_cs_disable;
493 }
494
495
496 in_dev->name = DRIVER_TP;
497 in_dev->id.bustype = BUS_I2C;
498 in_dev->dev.parent = &client->dev;
499
500 __set_bit(EV_SYN, in_dev->evbit);
501 __set_bit(EV_KEY, in_dev->evbit);
502 __set_bit(EV_ABS, in_dev->evbit);
503
504 input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0,
505 pdata->touch_x_max, 0, 0);
506 input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0,
507 pdata->touch_y_max, 0, 0);
508 input_set_drvdata(in_dev, bu21013_data);
509
510 error = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq,
511 IRQF_TRIGGER_FALLING | IRQF_SHARED,
512 DRIVER_TP, bu21013_data);
513 if (error) {
514 dev_err(&client->dev, "request irq %d failed\n", pdata->irq);
515 goto err_cs_disable;
516 }
517
518 error = input_register_device(in_dev);
519 if (error) {
520 dev_err(&client->dev, "failed to register input device\n");
521 goto err_free_irq;
522 }
523
524 device_init_wakeup(&client->dev, pdata->wakeup);
525 i2c_set_clientdata(client, bu21013_data);
526
527 return 0;
528
529err_free_irq:
530 bu21013_free_irq(bu21013_data);
531err_cs_disable:
532 pdata->cs_dis(pdata->cs_pin);
533err_disable_regulator:
534 regulator_disable(bu21013_data->regulator);
535err_put_regulator:
536 regulator_put(bu21013_data->regulator);
537err_free_mem:
538 input_free_device(in_dev);
539 kfree(bu21013_data);
540
541 return error;
542}
543
544
545
546
547
548
549
550static int __devexit bu21013_remove(struct i2c_client *client)
551{
552 struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
553
554 bu21013_free_irq(bu21013_data);
555
556 bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin);
557
558 input_unregister_device(bu21013_data->in_dev);
559
560 regulator_disable(bu21013_data->regulator);
561 regulator_put(bu21013_data->regulator);
562
563 kfree(bu21013_data);
564
565 device_init_wakeup(&client->dev, false);
566
567 return 0;
568}
569
570#ifdef CONFIG_PM
571
572
573
574
575
576
577
578static int bu21013_suspend(struct device *dev)
579{
580 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
581 struct i2c_client *client = bu21013_data->client;
582
583 bu21013_data->touch_stopped = true;
584 if (device_may_wakeup(&client->dev))
585 enable_irq_wake(bu21013_data->chip->irq);
586 else
587 disable_irq(bu21013_data->chip->irq);
588
589 regulator_disable(bu21013_data->regulator);
590
591 return 0;
592}
593
594
595
596
597
598
599
600
601static int bu21013_resume(struct device *dev)
602{
603 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
604 struct i2c_client *client = bu21013_data->client;
605 int retval;
606
607 retval = regulator_enable(bu21013_data->regulator);
608 if (retval < 0) {
609 dev_err(&client->dev, "bu21013 regulator enable failed\n");
610 return retval;
611 }
612
613 retval = bu21013_init_chip(bu21013_data);
614 if (retval < 0) {
615 dev_err(&client->dev, "bu21013 controller config failed\n");
616 return retval;
617 }
618
619 bu21013_data->touch_stopped = false;
620
621 if (device_may_wakeup(&client->dev))
622 disable_irq_wake(bu21013_data->chip->irq);
623 else
624 enable_irq(bu21013_data->chip->irq);
625
626 return 0;
627}
628
629static const struct dev_pm_ops bu21013_dev_pm_ops = {
630 .suspend = bu21013_suspend,
631 .resume = bu21013_resume,
632};
633#endif
634
635static const struct i2c_device_id bu21013_id[] = {
636 { DRIVER_TP, 0 },
637 { }
638};
639MODULE_DEVICE_TABLE(i2c, bu21013_id);
640
641static struct i2c_driver bu21013_driver = {
642 .driver = {
643 .name = DRIVER_TP,
644 .owner = THIS_MODULE,
645#ifdef CONFIG_PM
646 .pm = &bu21013_dev_pm_ops,
647#endif
648 },
649 .probe = bu21013_probe,
650 .remove = __devexit_p(bu21013_remove),
651 .id_table = bu21013_id,
652};
653
654
655
656
657
658
659
660static int __init bu21013_init(void)
661{
662 return i2c_add_driver(&bu21013_driver);
663}
664
665
666
667
668
669
670
671static void __exit bu21013_exit(void)
672{
673 i2c_del_driver(&bu21013_driver);
674}
675
676module_init(bu21013_init);
677module_exit(bu21013_exit);
678
679MODULE_LICENSE("GPL v2");
680MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
681MODULE_DESCRIPTION("bu21013 touch screen controller driver");
682
