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1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> 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
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 * struct bu21013_ts_data - touch panel data structure
137 * @client: pointer to the i2c client
138 * @wait: variable to wait_queue_head_t structure
139 * @touch_stopped: touch stop flag
140 * @chip: pointer to the touch panel controller
141 * @in_dev: pointer to the input device structure
142 * @intr_pin: interrupt pin value
143 * @regulator: pointer to the Regulator used for touch screen
144 *
145 * Touch panel device data structure
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 * bu21013_read_block_data(): read the touch co-ordinates
159 * @data: bu21013_ts_data structure pointer
160 * @buf: byte pointer
161 *
162 * Read the touch co-ordinates using i2c read block into buffer
163 * and returns integer.
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 * bu21013_do_touch_report(): Get the touch co-ordinates
181 * @data: bu21013_ts_data structure pointer
182 *
183 * Get the touch co-ordinates from touch sensor registers and writes
184 * into device structure and returns integer.
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 * bu21013_gpio_irq() - gpio thread function for touch interrupt
245 * @irq: irq value
246 * @device_data: void pointer
247 *
248 * This gpio thread function for touch interrupt
249 * and returns irqreturn_t.
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 * bu21013_init_chip() - power on sequence for the bu21013 controller
275 * @data: device structure pointer
276 *
277 * This function is used to power on
278 * the bu21013 controller and returns integer.
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 * bu21013_free_irq() - frees IRQ registered for touchscreen
411 * @bu21013_data: device structure pointer
412 *
413 * This function signals interrupt thread to stop processing and
414 * frees interrupt.
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 * bu21013_probe() - initializes the i2c-client touchscreen driver
425 * @client: i2c client structure pointer
426 * @id: i2c device id pointer
427 *
428 * This function used to initializes the i2c-client touchscreen
429 * driver and returns integer.
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 /* configure the gpio pins */
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 /* configure the touch panel controller */
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 /* register the device to input subsystem */
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 * bu21013_remove() - removes the i2c-client touchscreen driver
545 * @client: i2c client structure pointer
546 *
547 * This function uses to remove the i2c-client
548 * touchscreen driver and returns integer.
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 * bu21013_suspend() - suspend the touch screen controller
573 * @dev: pointer to device structure
574 *
575 * This function is used to suspend the
576 * touch panel controller and returns integer
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 * bu21013_resume() - resume the touch screen controller
596 * @dev: pointer to device structure
597 *
598 * This function is used to resume the touch panel
599 * controller and returns integer.
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 * bu21013_init() - initializes the bu21013 touchscreen driver
656 *
657 * This function used to initializes the bu21013
658 * touchscreen driver and returns integer.
659 */
660static int __init bu21013_init(void)
661{
662 return i2c_add_driver(&bu21013_driver);
663}
664
665/**
666 * bu21013_exit() - de-initializes the bu21013 touchscreen driver
667 *
668 * This function uses to de-initializes the bu21013
669 * touchscreen driver and returns none.
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");
1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> 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#include <linux/gpio.h>
18#include <linux/of.h>
19#include <linux/of_gpio.h>
20
21#define PEN_DOWN_INTR 0
22#define MAX_FINGERS 2
23#define RESET_DELAY 30
24#define PENUP_TIMEOUT (10)
25#define DELTA_MIN 16
26#define MASK_BITS 0x03
27#define SHIFT_8 8
28#define SHIFT_2 2
29#define LENGTH_OF_BUFFER 11
30#define I2C_RETRY_COUNT 5
31
32#define BU21013_SENSORS_BTN_0_7_REG 0x70
33#define BU21013_SENSORS_BTN_8_15_REG 0x71
34#define BU21013_SENSORS_BTN_16_23_REG 0x72
35#define BU21013_X1_POS_MSB_REG 0x73
36#define BU21013_X1_POS_LSB_REG 0x74
37#define BU21013_Y1_POS_MSB_REG 0x75
38#define BU21013_Y1_POS_LSB_REG 0x76
39#define BU21013_X2_POS_MSB_REG 0x77
40#define BU21013_X2_POS_LSB_REG 0x78
41#define BU21013_Y2_POS_MSB_REG 0x79
42#define BU21013_Y2_POS_LSB_REG 0x7A
43#define BU21013_INT_CLR_REG 0xE8
44#define BU21013_INT_MODE_REG 0xE9
45#define BU21013_GAIN_REG 0xEA
46#define BU21013_OFFSET_MODE_REG 0xEB
47#define BU21013_XY_EDGE_REG 0xEC
48#define BU21013_RESET_REG 0xED
49#define BU21013_CALIB_REG 0xEE
50#define BU21013_DONE_REG 0xEF
51#define BU21013_SENSOR_0_7_REG 0xF0
52#define BU21013_SENSOR_8_15_REG 0xF1
53#define BU21013_SENSOR_16_23_REG 0xF2
54#define BU21013_POS_MODE1_REG 0xF3
55#define BU21013_POS_MODE2_REG 0xF4
56#define BU21013_CLK_MODE_REG 0xF5
57#define BU21013_IDLE_REG 0xFA
58#define BU21013_FILTER_REG 0xFB
59#define BU21013_TH_ON_REG 0xFC
60#define BU21013_TH_OFF_REG 0xFD
61
62
63#define BU21013_RESET_ENABLE 0x01
64
65#define BU21013_SENSORS_EN_0_7 0x3F
66#define BU21013_SENSORS_EN_8_15 0xFC
67#define BU21013_SENSORS_EN_16_23 0x1F
68
69#define BU21013_POS_MODE1_0 0x02
70#define BU21013_POS_MODE1_1 0x04
71#define BU21013_POS_MODE1_2 0x08
72
73#define BU21013_POS_MODE2_ZERO 0x01
74#define BU21013_POS_MODE2_AVG1 0x02
75#define BU21013_POS_MODE2_AVG2 0x04
76#define BU21013_POS_MODE2_EN_XY 0x08
77#define BU21013_POS_MODE2_EN_RAW 0x10
78#define BU21013_POS_MODE2_MULTI 0x80
79
80#define BU21013_CLK_MODE_DIV 0x01
81#define BU21013_CLK_MODE_EXT 0x02
82#define BU21013_CLK_MODE_CALIB 0x80
83
84#define BU21013_IDLET_0 0x01
85#define BU21013_IDLET_1 0x02
86#define BU21013_IDLET_2 0x04
87#define BU21013_IDLET_3 0x08
88#define BU21013_IDLE_INTERMIT_EN 0x10
89
90#define BU21013_DELTA_0_6 0x7F
91#define BU21013_FILTER_EN 0x80
92
93#define BU21013_INT_MODE_LEVEL 0x00
94#define BU21013_INT_MODE_EDGE 0x01
95
96#define BU21013_GAIN_0 0x01
97#define BU21013_GAIN_1 0x02
98#define BU21013_GAIN_2 0x04
99
100#define BU21013_OFFSET_MODE_DEFAULT 0x00
101#define BU21013_OFFSET_MODE_MOVE 0x01
102#define BU21013_OFFSET_MODE_DISABLE 0x02
103
104#define BU21013_TH_ON_0 0x01
105#define BU21013_TH_ON_1 0x02
106#define BU21013_TH_ON_2 0x04
107#define BU21013_TH_ON_3 0x08
108#define BU21013_TH_ON_4 0x10
109#define BU21013_TH_ON_5 0x20
110#define BU21013_TH_ON_6 0x40
111#define BU21013_TH_ON_7 0x80
112#define BU21013_TH_ON_MAX 0xFF
113
114#define BU21013_TH_OFF_0 0x01
115#define BU21013_TH_OFF_1 0x02
116#define BU21013_TH_OFF_2 0x04
117#define BU21013_TH_OFF_3 0x08
118#define BU21013_TH_OFF_4 0x10
119#define BU21013_TH_OFF_5 0x20
120#define BU21013_TH_OFF_6 0x40
121#define BU21013_TH_OFF_7 0x80
122#define BU21013_TH_OFF_MAX 0xFF
123
124#define BU21013_X_EDGE_0 0x01
125#define BU21013_X_EDGE_1 0x02
126#define BU21013_X_EDGE_2 0x04
127#define BU21013_X_EDGE_3 0x08
128#define BU21013_Y_EDGE_0 0x10
129#define BU21013_Y_EDGE_1 0x20
130#define BU21013_Y_EDGE_2 0x40
131#define BU21013_Y_EDGE_3 0x80
132
133#define BU21013_DONE 0x01
134#define BU21013_NUMBER_OF_X_SENSORS (6)
135#define BU21013_NUMBER_OF_Y_SENSORS (11)
136
137#define DRIVER_TP "bu21013_tp"
138
139/**
140 * struct bu21013_ts_data - touch panel data structure
141 * @client: pointer to the i2c client
142 * @wait: variable to wait_queue_head_t structure
143 * @touch_stopped: touch stop flag
144 * @chip: pointer to the touch panel controller
145 * @in_dev: pointer to the input device structure
146 * @intr_pin: interrupt pin value
147 * @regulator: pointer to the Regulator used for touch screen
148 *
149 * Touch panel device data structure
150 */
151struct bu21013_ts_data {
152 struct i2c_client *client;
153 wait_queue_head_t wait;
154 const struct bu21013_platform_device *chip;
155 struct input_dev *in_dev;
156 struct regulator *regulator;
157 unsigned int irq;
158 unsigned int intr_pin;
159 bool touch_stopped;
160};
161
162/**
163 * bu21013_read_block_data(): read the touch co-ordinates
164 * @data: bu21013_ts_data structure pointer
165 * @buf: byte pointer
166 *
167 * Read the touch co-ordinates using i2c read block into buffer
168 * and returns integer.
169 */
170static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf)
171{
172 int ret, i;
173
174 for (i = 0; i < I2C_RETRY_COUNT; i++) {
175 ret = i2c_smbus_read_i2c_block_data
176 (data->client, BU21013_SENSORS_BTN_0_7_REG,
177 LENGTH_OF_BUFFER, buf);
178 if (ret == LENGTH_OF_BUFFER)
179 return 0;
180 }
181 return -EINVAL;
182}
183
184/**
185 * bu21013_do_touch_report(): Get the touch co-ordinates
186 * @data: bu21013_ts_data structure pointer
187 *
188 * Get the touch co-ordinates from touch sensor registers and writes
189 * into device structure and returns integer.
190 */
191static int bu21013_do_touch_report(struct bu21013_ts_data *data)
192{
193 u8 buf[LENGTH_OF_BUFFER];
194 unsigned int pos_x[2], pos_y[2];
195 bool has_x_sensors, has_y_sensors;
196 int finger_down_count = 0;
197 int i;
198
199 if (data == NULL)
200 return -EINVAL;
201
202 if (bu21013_read_block_data(data, buf) < 0)
203 return -EINVAL;
204
205 has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
206 has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
207 ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
208 if (!has_x_sensors || !has_y_sensors)
209 return 0;
210
211 for (i = 0; i < MAX_FINGERS; i++) {
212 const u8 *p = &buf[4 * i + 3];
213 unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS);
214 unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS);
215 if (x == 0 || y == 0)
216 continue;
217 pos_x[finger_down_count] = x;
218 pos_y[finger_down_count] = y;
219 finger_down_count++;
220 }
221
222 if (finger_down_count) {
223 if (finger_down_count == 2 &&
224 (abs(pos_x[0] - pos_x[1]) < DELTA_MIN ||
225 abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) {
226 return 0;
227 }
228
229 for (i = 0; i < finger_down_count; i++) {
230 if (data->chip->x_flip)
231 pos_x[i] = data->chip->touch_x_max - pos_x[i];
232 if (data->chip->y_flip)
233 pos_y[i] = data->chip->touch_y_max - pos_y[i];
234
235 input_report_abs(data->in_dev,
236 ABS_MT_POSITION_X, pos_x[i]);
237 input_report_abs(data->in_dev,
238 ABS_MT_POSITION_Y, pos_y[i]);
239 input_mt_sync(data->in_dev);
240 }
241 } else
242 input_mt_sync(data->in_dev);
243
244 input_sync(data->in_dev);
245
246 return 0;
247}
248/**
249 * bu21013_gpio_irq() - gpio thread function for touch interrupt
250 * @irq: irq value
251 * @device_data: void pointer
252 *
253 * This gpio thread function for touch interrupt
254 * and returns irqreturn_t.
255 */
256static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
257{
258 struct bu21013_ts_data *data = device_data;
259 struct i2c_client *i2c = data->client;
260 int retval;
261
262 do {
263 retval = bu21013_do_touch_report(data);
264 if (retval < 0) {
265 dev_err(&i2c->dev, "bu21013_do_touch_report failed\n");
266 return IRQ_NONE;
267 }
268
269 data->intr_pin = gpio_get_value(data->chip->touch_pin);
270 if (data->intr_pin == PEN_DOWN_INTR)
271 wait_event_timeout(data->wait, data->touch_stopped,
272 msecs_to_jiffies(2));
273 } while (!data->intr_pin && !data->touch_stopped);
274
275 return IRQ_HANDLED;
276}
277
278/**
279 * bu21013_init_chip() - power on sequence for the bu21013 controller
280 * @data: device structure pointer
281 *
282 * This function is used to power on
283 * the bu21013 controller and returns integer.
284 */
285static int bu21013_init_chip(struct bu21013_ts_data *data)
286{
287 int retval;
288 struct i2c_client *i2c = data->client;
289
290 retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG,
291 BU21013_RESET_ENABLE);
292 if (retval < 0) {
293 dev_err(&i2c->dev, "BU21013_RESET reg write failed\n");
294 return retval;
295 }
296 msleep(RESET_DELAY);
297
298 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG,
299 BU21013_SENSORS_EN_0_7);
300 if (retval < 0) {
301 dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n");
302 return retval;
303 }
304
305 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG,
306 BU21013_SENSORS_EN_8_15);
307 if (retval < 0) {
308 dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n");
309 return retval;
310 }
311
312 retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG,
313 BU21013_SENSORS_EN_16_23);
314 if (retval < 0) {
315 dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n");
316 return retval;
317 }
318
319 retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG,
320 (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1));
321 if (retval < 0) {
322 dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n");
323 return retval;
324 }
325
326 retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG,
327 (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 |
328 BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW |
329 BU21013_POS_MODE2_MULTI));
330 if (retval < 0) {
331 dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n");
332 return retval;
333 }
334
335 if (data->chip->ext_clk)
336 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
337 (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB));
338 else
339 retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG,
340 (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB));
341 if (retval < 0) {
342 dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n");
343 return retval;
344 }
345
346 retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG,
347 (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN));
348 if (retval < 0) {
349 dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n");
350 return retval;
351 }
352
353 retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG,
354 BU21013_INT_MODE_LEVEL);
355 if (retval < 0) {
356 dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n");
357 return retval;
358 }
359
360 retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG,
361 (BU21013_DELTA_0_6 |
362 BU21013_FILTER_EN));
363 if (retval < 0) {
364 dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n");
365 return retval;
366 }
367
368 retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG,
369 BU21013_TH_ON_5);
370 if (retval < 0) {
371 dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n");
372 return retval;
373 }
374
375 retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG,
376 BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
377 if (retval < 0) {
378 dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n");
379 return retval;
380 }
381
382 retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG,
383 (BU21013_GAIN_0 | BU21013_GAIN_1));
384 if (retval < 0) {
385 dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n");
386 return retval;
387 }
388
389 retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG,
390 BU21013_OFFSET_MODE_DEFAULT);
391 if (retval < 0) {
392 dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n");
393 return retval;
394 }
395
396 retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG,
397 (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 |
398 BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3));
399 if (retval < 0) {
400 dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n");
401 return retval;
402 }
403
404 retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG,
405 BU21013_DONE);
406 if (retval < 0) {
407 dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n");
408 return retval;
409 }
410
411 return 0;
412}
413
414/**
415 * bu21013_free_irq() - frees IRQ registered for touchscreen
416 * @bu21013_data: device structure pointer
417 *
418 * This function signals interrupt thread to stop processing and
419 * frees interrupt.
420 */
421static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
422{
423 bu21013_data->touch_stopped = true;
424 wake_up(&bu21013_data->wait);
425 free_irq(bu21013_data->irq, bu21013_data);
426}
427
428/**
429 * bu21013_cs_disable() - deconfigures the touch panel controller
430 * @bu21013_data: device structure pointer
431 *
432 * This function is used to deconfigure the chip selection
433 * for touch panel controller.
434 */
435static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data)
436{
437 int error;
438
439 error = gpio_direction_output(bu21013_data->chip->cs_pin, 0);
440 if (error < 0)
441 dev_warn(&bu21013_data->client->dev,
442 "%s: gpio direction failed, error: %d\n",
443 __func__, error);
444 else
445 gpio_set_value(bu21013_data->chip->cs_pin, 0);
446
447 gpio_free(bu21013_data->chip->cs_pin);
448}
449
450#ifdef CONFIG_OF
451static const struct bu21013_platform_device *
452bu21013_parse_dt(struct device *dev)
453{
454 struct device_node *np = dev->of_node;
455 struct bu21013_platform_device *pdata;
456
457 if (!np) {
458 dev_err(dev, "no device tree or platform data\n");
459 return ERR_PTR(-EINVAL);
460 }
461
462 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
463 if (!pdata)
464 return ERR_PTR(-ENOMEM);
465
466 pdata->y_flip = pdata->x_flip = false;
467
468 pdata->x_flip = of_property_read_bool(np, "rohm,flip-x");
469 pdata->y_flip = of_property_read_bool(np, "rohm,flip-y");
470
471 of_property_read_u32(np, "rohm,touch-max-x", &pdata->touch_x_max);
472 of_property_read_u32(np, "rohm,touch-max-y", &pdata->touch_y_max);
473
474 pdata->touch_pin = of_get_named_gpio(np, "touch-gpio", 0);
475 pdata->cs_pin = of_get_named_gpio(np, "reset-gpio", 0);
476
477 pdata->ext_clk = false;
478
479 return pdata;
480}
481#else
482static inline const struct bu21013_platform_device *
483bu21013_parse_dt(struct device *dev)
484{
485 dev_err(dev, "no platform data available\n");
486 return ERR_PTR(-EINVAL);
487}
488#endif
489
490/**
491 * bu21013_probe() - initializes the i2c-client touchscreen driver
492 * @client: i2c client structure pointer
493 * @id: i2c device id pointer
494 *
495 * This function used to initializes the i2c-client touchscreen
496 * driver and returns integer.
497 */
498static int bu21013_probe(struct i2c_client *client,
499 const struct i2c_device_id *id)
500{
501 const struct bu21013_platform_device *pdata =
502 dev_get_platdata(&client->dev);
503 struct bu21013_ts_data *bu21013_data;
504 struct input_dev *in_dev;
505 int error;
506
507 if (!i2c_check_functionality(client->adapter,
508 I2C_FUNC_SMBUS_BYTE_DATA)) {
509 dev_err(&client->dev, "i2c smbus byte data not supported\n");
510 return -EIO;
511 }
512
513 if (!pdata) {
514 pdata = bu21013_parse_dt(&client->dev);
515 if (IS_ERR(pdata))
516 return PTR_ERR(pdata);
517 }
518
519 if (!gpio_is_valid(pdata->touch_pin)) {
520 dev_err(&client->dev, "invalid touch_pin supplied\n");
521 return -EINVAL;
522 }
523
524 bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
525 in_dev = input_allocate_device();
526 if (!bu21013_data || !in_dev) {
527 dev_err(&client->dev, "device memory alloc failed\n");
528 error = -ENOMEM;
529 goto err_free_mem;
530 }
531
532 bu21013_data->in_dev = in_dev;
533 bu21013_data->chip = pdata;
534 bu21013_data->client = client;
535 bu21013_data->irq = gpio_to_irq(pdata->touch_pin);
536
537 bu21013_data->regulator = regulator_get(&client->dev, "avdd");
538 if (IS_ERR(bu21013_data->regulator)) {
539 dev_err(&client->dev, "regulator_get failed\n");
540 error = PTR_ERR(bu21013_data->regulator);
541 goto err_free_mem;
542 }
543
544 error = regulator_enable(bu21013_data->regulator);
545 if (error < 0) {
546 dev_err(&client->dev, "regulator enable failed\n");
547 goto err_put_regulator;
548 }
549
550 bu21013_data->touch_stopped = false;
551 init_waitqueue_head(&bu21013_data->wait);
552
553 /* configure the gpio pins */
554 error = gpio_request_one(pdata->cs_pin, GPIOF_OUT_INIT_HIGH,
555 "touchp_reset");
556 if (error < 0) {
557 dev_err(&client->dev, "Unable to request gpio reset_pin\n");
558 goto err_disable_regulator;
559 }
560
561 /* configure the touch panel controller */
562 error = bu21013_init_chip(bu21013_data);
563 if (error) {
564 dev_err(&client->dev, "error in bu21013 config\n");
565 goto err_cs_disable;
566 }
567
568 /* register the device to input subsystem */
569 in_dev->name = DRIVER_TP;
570 in_dev->id.bustype = BUS_I2C;
571 in_dev->dev.parent = &client->dev;
572
573 __set_bit(EV_SYN, in_dev->evbit);
574 __set_bit(EV_KEY, in_dev->evbit);
575 __set_bit(EV_ABS, in_dev->evbit);
576
577 input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0,
578 pdata->touch_x_max, 0, 0);
579 input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0,
580 pdata->touch_y_max, 0, 0);
581 input_set_drvdata(in_dev, bu21013_data);
582
583 error = request_threaded_irq(bu21013_data->irq, NULL, bu21013_gpio_irq,
584 IRQF_TRIGGER_FALLING | IRQF_SHARED |
585 IRQF_ONESHOT,
586 DRIVER_TP, bu21013_data);
587 if (error) {
588 dev_err(&client->dev, "request irq %d failed\n",
589 bu21013_data->irq);
590 goto err_cs_disable;
591 }
592
593 error = input_register_device(in_dev);
594 if (error) {
595 dev_err(&client->dev, "failed to register input device\n");
596 goto err_free_irq;
597 }
598
599 device_init_wakeup(&client->dev, pdata->wakeup);
600 i2c_set_clientdata(client, bu21013_data);
601
602 return 0;
603
604err_free_irq:
605 bu21013_free_irq(bu21013_data);
606err_cs_disable:
607 bu21013_cs_disable(bu21013_data);
608err_disable_regulator:
609 regulator_disable(bu21013_data->regulator);
610err_put_regulator:
611 regulator_put(bu21013_data->regulator);
612err_free_mem:
613 input_free_device(in_dev);
614 kfree(bu21013_data);
615
616 return error;
617}
618/**
619 * bu21013_remove() - removes the i2c-client touchscreen driver
620 * @client: i2c client structure pointer
621 *
622 * This function uses to remove the i2c-client
623 * touchscreen driver and returns integer.
624 */
625static int bu21013_remove(struct i2c_client *client)
626{
627 struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client);
628
629 bu21013_free_irq(bu21013_data);
630
631 bu21013_cs_disable(bu21013_data);
632
633 input_unregister_device(bu21013_data->in_dev);
634
635 regulator_disable(bu21013_data->regulator);
636 regulator_put(bu21013_data->regulator);
637
638 kfree(bu21013_data);
639
640 device_init_wakeup(&client->dev, false);
641
642 return 0;
643}
644
645#ifdef CONFIG_PM
646/**
647 * bu21013_suspend() - suspend the touch screen controller
648 * @dev: pointer to device structure
649 *
650 * This function is used to suspend the
651 * touch panel controller and returns integer
652 */
653static int bu21013_suspend(struct device *dev)
654{
655 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
656 struct i2c_client *client = bu21013_data->client;
657
658 bu21013_data->touch_stopped = true;
659 if (device_may_wakeup(&client->dev))
660 enable_irq_wake(bu21013_data->irq);
661 else
662 disable_irq(bu21013_data->irq);
663
664 regulator_disable(bu21013_data->regulator);
665
666 return 0;
667}
668
669/**
670 * bu21013_resume() - resume the touch screen controller
671 * @dev: pointer to device structure
672 *
673 * This function is used to resume the touch panel
674 * controller and returns integer.
675 */
676static int bu21013_resume(struct device *dev)
677{
678 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
679 struct i2c_client *client = bu21013_data->client;
680 int retval;
681
682 retval = regulator_enable(bu21013_data->regulator);
683 if (retval < 0) {
684 dev_err(&client->dev, "bu21013 regulator enable failed\n");
685 return retval;
686 }
687
688 retval = bu21013_init_chip(bu21013_data);
689 if (retval < 0) {
690 dev_err(&client->dev, "bu21013 controller config failed\n");
691 return retval;
692 }
693
694 bu21013_data->touch_stopped = false;
695
696 if (device_may_wakeup(&client->dev))
697 disable_irq_wake(bu21013_data->irq);
698 else
699 enable_irq(bu21013_data->irq);
700
701 return 0;
702}
703
704static const struct dev_pm_ops bu21013_dev_pm_ops = {
705 .suspend = bu21013_suspend,
706 .resume = bu21013_resume,
707};
708#endif
709
710static const struct i2c_device_id bu21013_id[] = {
711 { DRIVER_TP, 0 },
712 { }
713};
714MODULE_DEVICE_TABLE(i2c, bu21013_id);
715
716static struct i2c_driver bu21013_driver = {
717 .driver = {
718 .name = DRIVER_TP,
719#ifdef CONFIG_PM
720 .pm = &bu21013_dev_pm_ops,
721#endif
722 },
723 .probe = bu21013_probe,
724 .remove = bu21013_remove,
725 .id_table = bu21013_id,
726};
727
728module_i2c_driver(bu21013_driver);
729
730MODULE_LICENSE("GPL v2");
731MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
732MODULE_DESCRIPTION("bu21013 touch screen controller driver");