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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#include <linux/module.h>
17
18#define PEN_DOWN_INTR 0
19#define MAX_FINGERS 2
20#define RESET_DELAY 30
21#define PENUP_TIMEOUT (10)
22#define DELTA_MIN 16
23#define MASK_BITS 0x03
24#define SHIFT_8 8
25#define SHIFT_2 2
26#define LENGTH_OF_BUFFER 11
27#define I2C_RETRY_COUNT 5
28
29#define BU21013_SENSORS_BTN_0_7_REG 0x70
30#define BU21013_SENSORS_BTN_8_15_REG 0x71
31#define BU21013_SENSORS_BTN_16_23_REG 0x72
32#define BU21013_X1_POS_MSB_REG 0x73
33#define BU21013_X1_POS_LSB_REG 0x74
34#define BU21013_Y1_POS_MSB_REG 0x75
35#define BU21013_Y1_POS_LSB_REG 0x76
36#define BU21013_X2_POS_MSB_REG 0x77
37#define BU21013_X2_POS_LSB_REG 0x78
38#define BU21013_Y2_POS_MSB_REG 0x79
39#define BU21013_Y2_POS_LSB_REG 0x7A
40#define BU21013_INT_CLR_REG 0xE8
41#define BU21013_INT_MODE_REG 0xE9
42#define BU21013_GAIN_REG 0xEA
43#define BU21013_OFFSET_MODE_REG 0xEB
44#define BU21013_XY_EDGE_REG 0xEC
45#define BU21013_RESET_REG 0xED
46#define BU21013_CALIB_REG 0xEE
47#define BU21013_DONE_REG 0xEF
48#define BU21013_SENSOR_0_7_REG 0xF0
49#define BU21013_SENSOR_8_15_REG 0xF1
50#define BU21013_SENSOR_16_23_REG 0xF2
51#define BU21013_POS_MODE1_REG 0xF3
52#define BU21013_POS_MODE2_REG 0xF4
53#define BU21013_CLK_MODE_REG 0xF5
54#define BU21013_IDLE_REG 0xFA
55#define BU21013_FILTER_REG 0xFB
56#define BU21013_TH_ON_REG 0xFC
57#define BU21013_TH_OFF_REG 0xFD
58
59
60#define BU21013_RESET_ENABLE 0x01
61
62#define BU21013_SENSORS_EN_0_7 0x3F
63#define BU21013_SENSORS_EN_8_15 0xFC
64#define BU21013_SENSORS_EN_16_23 0x1F
65
66#define BU21013_POS_MODE1_0 0x02
67#define BU21013_POS_MODE1_1 0x04
68#define BU21013_POS_MODE1_2 0x08
69
70#define BU21013_POS_MODE2_ZERO 0x01
71#define BU21013_POS_MODE2_AVG1 0x02
72#define BU21013_POS_MODE2_AVG2 0x04
73#define BU21013_POS_MODE2_EN_XY 0x08
74#define BU21013_POS_MODE2_EN_RAW 0x10
75#define BU21013_POS_MODE2_MULTI 0x80
76
77#define BU21013_CLK_MODE_DIV 0x01
78#define BU21013_CLK_MODE_EXT 0x02
79#define BU21013_CLK_MODE_CALIB 0x80
80
81#define BU21013_IDLET_0 0x01
82#define BU21013_IDLET_1 0x02
83#define BU21013_IDLET_2 0x04
84#define BU21013_IDLET_3 0x08
85#define BU21013_IDLE_INTERMIT_EN 0x10
86
87#define BU21013_DELTA_0_6 0x7F
88#define BU21013_FILTER_EN 0x80
89
90#define BU21013_INT_MODE_LEVEL 0x00
91#define BU21013_INT_MODE_EDGE 0x01
92
93#define BU21013_GAIN_0 0x01
94#define BU21013_GAIN_1 0x02
95#define BU21013_GAIN_2 0x04
96
97#define BU21013_OFFSET_MODE_DEFAULT 0x00
98#define BU21013_OFFSET_MODE_MOVE 0x01
99#define BU21013_OFFSET_MODE_DISABLE 0x02
100
101#define BU21013_TH_ON_0 0x01
102#define BU21013_TH_ON_1 0x02
103#define BU21013_TH_ON_2 0x04
104#define BU21013_TH_ON_3 0x08
105#define BU21013_TH_ON_4 0x10
106#define BU21013_TH_ON_5 0x20
107#define BU21013_TH_ON_6 0x40
108#define BU21013_TH_ON_7 0x80
109#define BU21013_TH_ON_MAX 0xFF
110
111#define BU21013_TH_OFF_0 0x01
112#define BU21013_TH_OFF_1 0x02
113#define BU21013_TH_OFF_2 0x04
114#define BU21013_TH_OFF_3 0x08
115#define BU21013_TH_OFF_4 0x10
116#define BU21013_TH_OFF_5 0x20
117#define BU21013_TH_OFF_6 0x40
118#define BU21013_TH_OFF_7 0x80
119#define BU21013_TH_OFF_MAX 0xFF
120
121#define BU21013_X_EDGE_0 0x01
122#define BU21013_X_EDGE_1 0x02
123#define BU21013_X_EDGE_2 0x04
124#define BU21013_X_EDGE_3 0x08
125#define BU21013_Y_EDGE_0 0x10
126#define BU21013_Y_EDGE_1 0x20
127#define BU21013_Y_EDGE_2 0x40
128#define BU21013_Y_EDGE_3 0x80
129
130#define BU21013_DONE 0x01
131#define BU21013_NUMBER_OF_X_SENSORS (6)
132#define BU21013_NUMBER_OF_Y_SENSORS (11)
133
134#define DRIVER_TP "bu21013_tp"
135
136
137
138
139
140
141
142
143
144
145
146
147
148struct bu21013_ts_data {
149 struct i2c_client *client;
150 wait_queue_head_t wait;
151 bool touch_stopped;
152 const struct bu21013_platform_device *chip;
153 struct input_dev *in_dev;
154 unsigned int intr_pin;
155 struct regulator *regulator;
156};
157
158
159
160
161
162
163
164
165
166static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf)
167{
168 int ret, i;
169
170 for (i = 0; i < I2C_RETRY_COUNT; i++) {
171 ret = i2c_smbus_read_i2c_block_data
172 (data->client, BU21013_SENSORS_BTN_0_7_REG,
173 LENGTH_OF_BUFFER, buf);
174 if (ret == LENGTH_OF_BUFFER)
175 return 0;
176 }
177 return -EINVAL;
178}
179
180
181
182
183
184
185
186
187static int bu21013_do_touch_report(struct bu21013_ts_data *data)
188{
189 u8 buf[LENGTH_OF_BUFFER];
190 unsigned int pos_x[2], pos_y[2];
191 bool has_x_sensors, has_y_sensors;
192 int finger_down_count = 0;
193 int i;
194
195 if (data == NULL)
196 return -EINVAL;
197
198 if (bu21013_read_block_data(data, buf) < 0)
199 return -EINVAL;
200
201 has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
202 has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
203 ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
204 if (!has_x_sensors || !has_y_sensors)
205 return 0;
206
207 for (i = 0; i < MAX_FINGERS; i++) {
208 const u8 *p = &buf[4 * i + 3];
209 unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS);
210 unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS);
211 if (x == 0 || y == 0)
212 continue;
213 pos_x[finger_down_count] = x;
214 pos_y[finger_down_count] = y;
215 finger_down_count++;
216 }
217
218 if (finger_down_count) {
219 if (finger_down_count == 2 &&
220 (abs(pos_x[0] - pos_x[1]) < DELTA_MIN ||
221 abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) {
222 return 0;
223 }
224
225 for (i = 0; i < finger_down_count; i++) {
226 if (data->chip->x_flip)
227 pos_x[i] = data->chip->touch_x_max - pos_x[i];
228 if (data->chip->y_flip)
229 pos_y[i] = data->chip->touch_y_max - pos_y[i];
230
231 input_report_abs(data->in_dev,
232 ABS_MT_POSITION_X, pos_x[i]);
233 input_report_abs(data->in_dev,
234 ABS_MT_POSITION_Y, pos_y[i]);
235 input_mt_sync(data->in_dev);
236 }
237 } else
238 input_mt_sync(data->in_dev);
239
240 input_sync(data->in_dev);
241
242 return 0;
243}
244
245
246
247
248
249
250
251
252static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
253{
254 struct bu21013_ts_data *data = device_data;
255 struct i2c_client *i2c = data->client;
256 int retval;
257
258 do {
259 retval = bu21013_do_touch_report(data);
260 if (retval < 0) {
261 dev_err(&i2c->dev, "bu21013_do_touch_report failed\n");
262 return IRQ_NONE;
263 }
264
265 data->intr_pin = data->chip->irq_read_val();
266 if (data->intr_pin == PEN_DOWN_INTR)
267 wait_event_timeout(data->wait, data->touch_stopped,
268 msecs_to_jiffies(2));
269 } while (!data->intr_pin && !data->touch_stopped);
270
271 return IRQ_HANDLED;
272}
273
274
275
276
277
278
279
280
281static int bu21013_init_chip(struct bu21013_ts_data *data)
282{
283 int retval;
284 struct i2c_client *i2c = data->client;
285
286 retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG,
287 BU21013_RESET_ENABLE);
288 if (retval < 0) {
289 dev_err(&i2c->dev, "BU21013_RESET reg write failed\n");
290 return retval;
291 }
292 msleep(RESET_DELAY);
293
294 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG,
295 BU21013_SENSORS_EN_0_7);
296 if (retval < 0) {
297 dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n");
298 return retval;
299 }
300
301 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG,
302 BU21013_SENSORS_EN_8_15);
303 if (retval < 0) {
304 dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n");
305 return retval;
306 }
307
308 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG,
309 BU21013_SENSORS_EN_16_23);
310 if (retval < 0) {
311 dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n");
312 return retval;
313 }
314
315 retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG,
316 (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1));
317 if (retval < 0) {
318 dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n");
319 return retval;
320 }
321
322 retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG,
323 (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 |
324 BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW |
325 BU21013_POS_MODE2_MULTI));
326 if (retval < 0) {
327 dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n");
328 return retval;
329 }
330
331 if (data->chip->ext_clk)
332 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
333 (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB));
334 else
335 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
336 (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB));
337 if (retval < 0) {
338 dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n");
339 return retval;
340 }
341
342 retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG,
343 (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN));
344 if (retval < 0) {
345 dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n");
346 return retval;
347 }
348
349 retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG,
350 BU21013_INT_MODE_LEVEL);
351 if (retval < 0) {
352 dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n");
353 return retval;
354 }
355
356 retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG,
357 (BU21013_DELTA_0_6 |
358 BU21013_FILTER_EN));
359 if (retval < 0) {
360 dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n");
361 return retval;
362 }
363
364 retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG,
365 BU21013_TH_ON_5);
366 if (retval < 0) {
367 dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n");
368 return retval;
369 }
370
371 retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG,
372 BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
373 if (retval < 0) {
374 dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n");
375 return retval;
376 }
377
378 retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG,
379 (BU21013_GAIN_0 | BU21013_GAIN_1));
380 if (retval < 0) {
381 dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n");
382 return retval;
383 }
384
385 retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG,
386 BU21013_OFFSET_MODE_DEFAULT);
387 if (retval < 0) {
388 dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n");
389 return retval;
390 }
391
392 retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG,
393 (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 |
394 BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3));
395 if (retval < 0) {
396 dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n");
397 return retval;
398 }
399
400 retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG,
401 BU21013_DONE);
402 if (retval < 0) {
403 dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n");
404 return retval;
405 }
406
407 return 0;
408}
409
410
411
412
413
414
415
416
417static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
418{
419 bu21013_data->touch_stopped = true;
420 wake_up(&bu21013_data->wait);
421 free_irq(bu21013_data->chip->irq, bu21013_data);
422}
423
424
425
426
427
428
429
430
431
432static int __devinit bu21013_probe(struct i2c_client *client,
433 const struct i2c_device_id *id)
434{
435 struct bu21013_ts_data *bu21013_data;
436 struct input_dev *in_dev;
437 const struct bu21013_platform_device *pdata =
438 client->dev.platform_data;
439 int error;
440
441 if (!i2c_check_functionality(client->adapter,
442 I2C_FUNC_SMBUS_BYTE_DATA)) {
443 dev_err(&client->dev, "i2c smbus byte data not supported\n");
444 return -EIO;
445 }
446
447 if (!pdata) {
448 dev_err(&client->dev, "platform data not defined\n");
449 return -EINVAL;
450 }
451
452 bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
453 in_dev = input_allocate_device();
454 if (!bu21013_data || !in_dev) {
455 dev_err(&client->dev, "device memory alloc failed\n");
456 error = -ENOMEM;
457 goto err_free_mem;
458 }
459
460 bu21013_data->in_dev = in_dev;
461 bu21013_data->chip = pdata;
462 bu21013_data->client = client;
463
464 bu21013_data->regulator = regulator_get(&client->dev, "V-TOUCH");
465 if (IS_ERR(bu21013_data->regulator)) {
466 dev_err(&client->dev, "regulator_get failed\n");
467 error = PTR_ERR(bu21013_data->regulator);
468 goto err_free_mem;
469 }
470
471 error = regulator_enable(bu21013_data->regulator);
472 if (error < 0) {
473 dev_err(&client->dev, "regulator enable failed\n");
474 goto err_put_regulator;
475 }
476
477 bu21013_data->touch_stopped = false;
478 init_waitqueue_head(&bu21013_data->wait);
479
480
481 if (pdata->cs_en) {
482 error = pdata->cs_en(pdata->cs_pin);
483 if (error < 0) {
484 dev_err(&client->dev, "chip init failed\n");
485 goto err_disable_regulator;
486 }
487 }
488
489
490 error = bu21013_init_chip(bu21013_data);
491 if (error) {
492 dev_err(&client->dev, "error in bu21013 config\n");
493 goto err_cs_disable;
494 }
495
496
497 in_dev->name = DRIVER_TP;
498 in_dev->id.bustype = BUS_I2C;
499 in_dev->dev.parent = &client->dev;
500
501 __set_bit(EV_SYN, in_dev->evbit);
502 __set_bit(EV_KEY, in_dev->evbit);
503 __set_bit(EV_ABS, in_dev->evbit);
504
505 input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0,
506 pdata->touch_x_max, 0, 0);
507 input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0,
508 pdata->touch_y_max, 0, 0);
509 input_set_drvdata(in_dev, bu21013_data);
510
511 error = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq,
512 IRQF_TRIGGER_FALLING | IRQF_SHARED |
513 IRQF_ONESHOT,
514 DRIVER_TP, bu21013_data);
515 if (error) {
516 dev_err(&client->dev, "request irq %d failed\n", pdata->irq);
517 goto err_cs_disable;
518 }
519
520 error = input_register_device(in_dev);
521 if (error) {
522 dev_err(&client->dev, "failed to register input device\n");
523 goto err_free_irq;
524 }
525
526 device_init_wakeup(&client->dev, pdata->wakeup);
527 i2c_set_clientdata(client, bu21013_data);
528
529 return 0;
530
531err_free_irq:
532 bu21013_free_irq(bu21013_data);
533err_cs_disable:
534 pdata->cs_dis(pdata->cs_pin);
535err_disable_regulator:
536 regulator_disable(bu21013_data->regulator);
537err_put_regulator:
538 regulator_put(bu21013_data->regulator);
539err_free_mem:
540 input_free_device(in_dev);
541 kfree(bu21013_data);
542
543 return error;
544}
545
546
547
548
549
550
551
552static int __devexit bu21013_remove(struct i2c_client *client)
553{
554 struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
555
556 bu21013_free_irq(bu21013_data);
557
558 bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin);
559
560 input_unregister_device(bu21013_data->in_dev);
561
562 regulator_disable(bu21013_data->regulator);
563 regulator_put(bu21013_data->regulator);
564
565 kfree(bu21013_data);
566
567 device_init_wakeup(&client->dev, false);
568
569 return 0;
570}
571
572#ifdef CONFIG_PM
573
574
575
576
577
578
579
580static int bu21013_suspend(struct device *dev)
581{
582 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
583 struct i2c_client *client = bu21013_data->client;
584
585 bu21013_data->touch_stopped = true;
586 if (device_may_wakeup(&client->dev))
587 enable_irq_wake(bu21013_data->chip->irq);
588 else
589 disable_irq(bu21013_data->chip->irq);
590
591 regulator_disable(bu21013_data->regulator);
592
593 return 0;
594}
595
596
597
598
599
600
601
602
603static int bu21013_resume(struct device *dev)
604{
605 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
606 struct i2c_client *client = bu21013_data->client;
607 int retval;
608
609 retval = regulator_enable(bu21013_data->regulator);
610 if (retval < 0) {
611 dev_err(&client->dev, "bu21013 regulator enable failed\n");
612 return retval;
613 }
614
615 retval = bu21013_init_chip(bu21013_data);
616 if (retval < 0) {
617 dev_err(&client->dev, "bu21013 controller config failed\n");
618 return retval;
619 }
620
621 bu21013_data->touch_stopped = false;
622
623 if (device_may_wakeup(&client->dev))
624 disable_irq_wake(bu21013_data->chip->irq);
625 else
626 enable_irq(bu21013_data->chip->irq);
627
628 return 0;
629}
630
631static const struct dev_pm_ops bu21013_dev_pm_ops = {
632 .suspend = bu21013_suspend,
633 .resume = bu21013_resume,
634};
635#endif
636
637static const struct i2c_device_id bu21013_id[] = {
638 { DRIVER_TP, 0 },
639 { }
640};
641MODULE_DEVICE_TABLE(i2c, bu21013_id);
642
643static struct i2c_driver bu21013_driver = {
644 .driver = {
645 .name = DRIVER_TP,
646 .owner = THIS_MODULE,
647#ifdef CONFIG_PM
648 .pm = &bu21013_dev_pm_ops,
649#endif
650 },
651 .probe = bu21013_probe,
652 .remove = __devexit_p(bu21013_remove),
653 .id_table = bu21013_id,
654};
655
656module_i2c_driver(bu21013_driver);
657
658MODULE_LICENSE("GPL v2");
659MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
660MODULE_DESCRIPTION("bu21013 touch screen controller driver");
661
