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bu21013_ts.c
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1 /*
2  * Copyright (C) ST-Ericsson SA 2010
3  * Author: Naveen Kumar G <[email protected]> for ST-Ericsson
4  * License terms:GNU General Public License (GPL) version 2
5  */
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 #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 
148 struct 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 
166 static 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 
187 static 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 }
252 static 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 
281 static 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 
417 static 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 
432 static 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  /* configure the gpio pins */
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  /* configure the touch panel controller */
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  /* register the device to input subsystem */
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 
531 err_free_irq:
532  bu21013_free_irq(bu21013_data);
533 err_cs_disable:
534  pdata->cs_dis(pdata->cs_pin);
535 err_disable_regulator:
536  regulator_disable(bu21013_data->regulator);
537 err_put_regulator:
538  regulator_put(bu21013_data->regulator);
539 err_free_mem:
540  input_free_device(in_dev);
541  kfree(bu21013_data);
542 
543  return error;
544 }
552 static 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 
580 static 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 
603 static 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 
631 static const struct dev_pm_ops bu21013_dev_pm_ops = {
632  .suspend = bu21013_suspend,
633  .resume = bu21013_resume,
634 };
635 #endif
636 
637 static const struct i2c_device_id bu21013_id[] = {
638  { DRIVER_TP, 0 },
639  { }
640 };
641 MODULE_DEVICE_TABLE(i2c, bu21013_id);
642 
643 static 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 
656 module_i2c_driver(bu21013_driver);
657 
658 MODULE_LICENSE("GPL v2");
659 MODULE_AUTHOR("Naveen Kumar G <[email protected]>");
660 MODULE_DESCRIPTION("bu21013 touch screen controller driver");
Generated on Thu Jan 10 2013 13:40:13 for Linux Kernel by   doxygen 1.8.2