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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#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
141
142
143
144
145
146
147
148
149
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
164
165
166
167
168
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
186
187
188
189
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
250
251
252
253
254
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
280
281
282
283
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
416
417
418
419
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
430
431
432
433
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
492
493
494
495
496
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
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
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
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
620
621
622
623
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 return 0;
641}
642
643#ifdef CONFIG_PM
644
645
646
647
648
649
650
651static int bu21013_suspend(struct device *dev)
652{
653 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
654 struct i2c_client *client = bu21013_data->client;
655
656 bu21013_data->touch_stopped = true;
657 if (device_may_wakeup(&client->dev))
658 enable_irq_wake(bu21013_data->irq);
659 else
660 disable_irq(bu21013_data->irq);
661
662 regulator_disable(bu21013_data->regulator);
663
664 return 0;
665}
666
667
668
669
670
671
672
673
674static int bu21013_resume(struct device *dev)
675{
676 struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev);
677 struct i2c_client *client = bu21013_data->client;
678 int retval;
679
680 retval = regulator_enable(bu21013_data->regulator);
681 if (retval < 0) {
682 dev_err(&client->dev, "bu21013 regulator enable failed\n");
683 return retval;
684 }
685
686 retval = bu21013_init_chip(bu21013_data);
687 if (retval < 0) {
688 dev_err(&client->dev, "bu21013 controller config failed\n");
689 return retval;
690 }
691
692 bu21013_data->touch_stopped = false;
693
694 if (device_may_wakeup(&client->dev))
695 disable_irq_wake(bu21013_data->irq);
696 else
697 enable_irq(bu21013_data->irq);
698
699 return 0;
700}
701
702static const struct dev_pm_ops bu21013_dev_pm_ops = {
703 .suspend = bu21013_suspend,
704 .resume = bu21013_resume,
705};
706#endif
707
708static const struct i2c_device_id bu21013_id[] = {
709 { DRIVER_TP, 0 },
710 { }
711};
712MODULE_DEVICE_TABLE(i2c, bu21013_id);
713
714static struct i2c_driver bu21013_driver = {
715 .driver = {
716 .name = DRIVER_TP,
717#ifdef CONFIG_PM
718 .pm = &bu21013_dev_pm_ops,
719#endif
720 },
721 .probe = bu21013_probe,
722 .remove = bu21013_remove,
723 .id_table = bu21013_id,
724};
725
726module_i2c_driver(bu21013_driver);
727
728MODULE_LICENSE("GPL v2");
729MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
730MODULE_DESCRIPTION("bu21013 touch screen controller driver");
731
