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1/*
2 * ROHM BU21023/24 Dual touch support resistive touch screen driver
3 * Copyright (C) 2012 ROHM CO.,LTD.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14#include <linux/delay.h>
15#include <linux/firmware.h>
16#include <linux/i2c.h>
17#include <linux/input.h>
18#include <linux/input/mt.h>
19#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22
23#define BU21023_NAME "bu21023_ts"
24#define BU21023_FIRMWARE_NAME "bu21023.bin"
25
26#define MAX_CONTACTS 2
27
28#define AXIS_ADJUST 4
29#define AXIS_OFFSET 8
30
31#define FIRMWARE_BLOCK_SIZE 32U
32#define FIRMWARE_RETRY_MAX 4
33
34#define SAMPLING_DELAY 12 /* msec */
35
36#define CALIBRATION_RETRY_MAX 6
37
38#define ROHM_TS_ABS_X_MIN 40
39#define ROHM_TS_ABS_X_MAX 990
40#define ROHM_TS_ABS_Y_MIN 160
41#define ROHM_TS_ABS_Y_MAX 920
42#define ROHM_TS_DISPLACEMENT_MAX 0 /* zero for infinite */
43
44/*
45 * BU21023GUL/BU21023MUV/BU21024FV-M registers map
46 */
47#define VADOUT_YP_H 0x00
48#define VADOUT_YP_L 0x01
49#define VADOUT_XP_H 0x02
50#define VADOUT_XP_L 0x03
51#define VADOUT_YN_H 0x04
52#define VADOUT_YN_L 0x05
53#define VADOUT_XN_H 0x06
54#define VADOUT_XN_L 0x07
55
56#define PRM1_X_H 0x08
57#define PRM1_X_L 0x09
58#define PRM1_Y_H 0x0a
59#define PRM1_Y_L 0x0b
60#define PRM2_X_H 0x0c
61#define PRM2_X_L 0x0d
62#define PRM2_Y_H 0x0e
63#define PRM2_Y_L 0x0f
64
65#define MLT_PRM_MONI_X 0x10
66#define MLT_PRM_MONI_Y 0x11
67
68#define DEBUG_MONI_1 0x12
69#define DEBUG_MONI_2 0x13
70
71#define VADOUT_ZX_H 0x14
72#define VADOUT_ZX_L 0x15
73#define VADOUT_ZY_H 0x16
74#define VADOUT_ZY_L 0x17
75
76#define Z_PARAM_H 0x18
77#define Z_PARAM_L 0x19
78
79/*
80 * Value for VADOUT_*_L
81 */
82#define VADOUT_L_MASK 0x01
83
84/*
85 * Value for PRM*_*_L
86 */
87#define PRM_L_MASK 0x01
88
89#define POS_X1_H 0x20
90#define POS_X1_L 0x21
91#define POS_Y1_H 0x22
92#define POS_Y1_L 0x23
93#define POS_X2_H 0x24
94#define POS_X2_L 0x25
95#define POS_Y2_H 0x26
96#define POS_Y2_L 0x27
97
98/*
99 * Value for POS_*_L
100 */
101#define POS_L_MASK 0x01
102
103#define TOUCH 0x28
104#define TOUCH_DETECT 0x01
105
106#define TOUCH_GESTURE 0x29
107#define SINGLE_TOUCH 0x01
108#define DUAL_TOUCH 0x03
109#define TOUCH_MASK 0x03
110#define CALIBRATION_REQUEST 0x04
111#define CALIBRATION_STATUS 0x08
112#define CALIBRATION_MASK 0x0c
113#define GESTURE_SPREAD 0x10
114#define GESTURE_PINCH 0x20
115#define GESTURE_ROTATE_R 0x40
116#define GESTURE_ROTATE_L 0x80
117
118#define INT_STATUS 0x2a
119#define INT_MASK 0x3d
120#define INT_CLEAR 0x3e
121
122/*
123 * Values for INT_*
124 */
125#define COORD_UPDATE 0x01
126#define CALIBRATION_DONE 0x02
127#define SLEEP_IN 0x04
128#define SLEEP_OUT 0x08
129#define PROGRAM_LOAD_DONE 0x10
130#define ERROR 0x80
131#define INT_ALL 0x9f
132
133#define ERR_STATUS 0x2b
134#define ERR_MASK 0x3f
135
136/*
137 * Values for ERR_*
138 */
139#define ADC_TIMEOUT 0x01
140#define CPU_TIMEOUT 0x02
141#define CALIBRATION_ERR 0x04
142#define PROGRAM_LOAD_ERR 0x10
143
144#define COMMON_SETUP1 0x30
145#define PROGRAM_LOAD_HOST 0x02
146#define PROGRAM_LOAD_EEPROM 0x03
147#define CENSOR_4PORT 0x04
148#define CENSOR_8PORT 0x00 /* Not supported by BU21023 */
149#define CALIBRATION_TYPE_DEFAULT 0x08
150#define CALIBRATION_TYPE_SPECIAL 0x00
151#define INT_ACTIVE_HIGH 0x10
152#define INT_ACTIVE_LOW 0x00
153#define AUTO_CALIBRATION 0x40
154#define MANUAL_CALIBRATION 0x00
155#define COMMON_SETUP1_DEFAULT 0x4e
156
157#define COMMON_SETUP2 0x31
158#define MAF_NONE 0x00
159#define MAF_1SAMPLE 0x01
160#define MAF_3SAMPLES 0x02
161#define MAF_5SAMPLES 0x03
162#define INV_Y 0x04
163#define INV_X 0x08
164#define SWAP_XY 0x10
165
166#define COMMON_SETUP3 0x32
167#define EN_SLEEP 0x01
168#define EN_MULTI 0x02
169#define EN_GESTURE 0x04
170#define EN_INTVL 0x08
171#define SEL_STEP 0x10
172#define SEL_MULTI 0x20
173#define SEL_TBL_DEFAULT 0x40
174
175#define INTERVAL_TIME 0x33
176#define INTERVAL_TIME_DEFAULT 0x10
177
178#define STEP_X 0x34
179#define STEP_X_DEFAULT 0x41
180
181#define STEP_Y 0x35
182#define STEP_Y_DEFAULT 0x8d
183
184#define OFFSET_X 0x38
185#define OFFSET_X_DEFAULT 0x0c
186
187#define OFFSET_Y 0x39
188#define OFFSET_Y_DEFAULT 0x0c
189
190#define THRESHOLD_TOUCH 0x3a
191#define THRESHOLD_TOUCH_DEFAULT 0xa0
192
193#define THRESHOLD_GESTURE 0x3b
194#define THRESHOLD_GESTURE_DEFAULT 0x17
195
196#define SYSTEM 0x40
197#define ANALOG_POWER_ON 0x01
198#define ANALOG_POWER_OFF 0x00
199#define CPU_POWER_ON 0x02
200#define CPU_POWER_OFF 0x00
201
202#define FORCE_CALIBRATION 0x42
203#define FORCE_CALIBRATION_ON 0x01
204#define FORCE_CALIBRATION_OFF 0x00
205
206#define CPU_FREQ 0x50 /* 10 / (reg + 1) MHz */
207#define CPU_FREQ_10MHZ 0x00
208#define CPU_FREQ_5MHZ 0x01
209#define CPU_FREQ_1MHZ 0x09
210
211#define EEPROM_ADDR 0x51
212
213#define CALIBRATION_ADJUST 0x52
214#define CALIBRATION_ADJUST_DEFAULT 0x00
215
216#define THRESHOLD_SLEEP_IN 0x53
217
218#define EVR_XY 0x56
219#define EVR_XY_DEFAULT 0x10
220
221#define PRM_SWOFF_TIME 0x57
222#define PRM_SWOFF_TIME_DEFAULT 0x04
223
224#define PROGRAM_VERSION 0x5f
225
226#define ADC_CTRL 0x60
227#define ADC_DIV_MASK 0x1f /* The minimum value is 4 */
228#define ADC_DIV_DEFAULT 0x08
229
230#define ADC_WAIT 0x61
231#define ADC_WAIT_DEFAULT 0x0a
232
233#define SWCONT 0x62
234#define SWCONT_DEFAULT 0x0f
235
236#define EVR_X 0x63
237#define EVR_X_DEFAULT 0x86
238
239#define EVR_Y 0x64
240#define EVR_Y_DEFAULT 0x64
241
242#define TEST1 0x65
243#define DUALTOUCH_STABILIZE_ON 0x01
244#define DUALTOUCH_STABILIZE_OFF 0x00
245#define DUALTOUCH_REG_ON 0x20
246#define DUALTOUCH_REG_OFF 0x00
247
248#define CALIBRATION_REG1 0x68
249#define CALIBRATION_REG1_DEFAULT 0xd9
250
251#define CALIBRATION_REG2 0x69
252#define CALIBRATION_REG2_DEFAULT 0x36
253
254#define CALIBRATION_REG3 0x6a
255#define CALIBRATION_REG3_DEFAULT 0x32
256
257#define EX_ADDR_H 0x70
258#define EX_ADDR_L 0x71
259#define EX_WDAT 0x72
260#define EX_RDAT 0x73
261#define EX_CHK_SUM1 0x74
262#define EX_CHK_SUM2 0x75
263#define EX_CHK_SUM3 0x76
264
265struct rohm_ts_data {
266 struct i2c_client *client;
267 struct input_dev *input;
268
269 bool initialized;
270
271 unsigned int contact_count[MAX_CONTACTS + 1];
272 int finger_count;
273
274 u8 setup2;
275};
276
277/*
278 * rohm_i2c_burst_read - execute combined I2C message for ROHM BU21023/24
279 * @client: Handle to ROHM BU21023/24
280 * @start: Where to start read address from ROHM BU21023/24
281 * @buf: Where to store read data from ROHM BU21023/24
282 * @len: How many bytes to read
283 *
284 * Returns negative errno, else zero on success.
285 *
286 * Note
287 * In BU21023/24 burst read, stop condition is needed after "address write".
288 * Therefore, transmission is performed in 2 steps.
289 */
290static int rohm_i2c_burst_read(struct i2c_client *client, u8 start, void *buf,
291 size_t len)
292{
293 struct i2c_adapter *adap = client->adapter;
294 struct i2c_msg msg[2];
295 int i, ret = 0;
296
297 msg[0].addr = client->addr;
298 msg[0].flags = 0;
299 msg[0].len = 1;
300 msg[0].buf = &start;
301
302 msg[1].addr = client->addr;
303 msg[1].flags = I2C_M_RD;
304 msg[1].len = len;
305 msg[1].buf = buf;
306
307 i2c_lock_adapter(adap);
308
309 for (i = 0; i < 2; i++) {
310 if (__i2c_transfer(adap, &msg[i], 1) < 0) {
311 ret = -EIO;
312 break;
313 }
314 }
315
316 i2c_unlock_adapter(adap);
317
318 return ret;
319}
320
321static int rohm_ts_manual_calibration(struct rohm_ts_data *ts)
322{
323 struct i2c_client *client = ts->client;
324 struct device *dev = &client->dev;
325 u8 buf[33]; /* for PRM1_X_H(0x08)-TOUCH(0x28) */
326
327 int retry;
328 bool success = false;
329 bool first_time = true;
330 bool calibration_done;
331
332 u8 reg1, reg2, reg3;
333 s32 reg1_orig, reg2_orig, reg3_orig;
334 s32 val;
335
336 int calib_x = 0, calib_y = 0;
337 int reg_x, reg_y;
338 int err_x, err_y;
339
340 int error, error2;
341 int i;
342
343 reg1_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG1);
344 if (reg1_orig < 0)
345 return reg1_orig;
346
347 reg2_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG2);
348 if (reg2_orig < 0)
349 return reg2_orig;
350
351 reg3_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG3);
352 if (reg3_orig < 0)
353 return reg3_orig;
354
355 error = i2c_smbus_write_byte_data(client, INT_MASK,
356 COORD_UPDATE | SLEEP_IN | SLEEP_OUT |
357 PROGRAM_LOAD_DONE);
358 if (error)
359 goto out;
360
361 error = i2c_smbus_write_byte_data(client, TEST1,
362 DUALTOUCH_STABILIZE_ON);
363 if (error)
364 goto out;
365
366 for (retry = 0; retry < CALIBRATION_RETRY_MAX; retry++) {
367 /* wait 2 sampling for update */
368 mdelay(2 * SAMPLING_DELAY);
369
370#define READ_CALIB_BUF(reg) buf[((reg) - PRM1_X_H)]
371
372 error = rohm_i2c_burst_read(client, PRM1_X_H, buf, sizeof(buf));
373 if (error)
374 goto out;
375
376 if (READ_CALIB_BUF(TOUCH) & TOUCH_DETECT)
377 continue;
378
379 if (first_time) {
380 /* generate calibration parameter */
381 calib_x = ((int)READ_CALIB_BUF(PRM1_X_H) << 2 |
382 READ_CALIB_BUF(PRM1_X_L)) - AXIS_OFFSET;
383 calib_y = ((int)READ_CALIB_BUF(PRM1_Y_H) << 2 |
384 READ_CALIB_BUF(PRM1_Y_L)) - AXIS_OFFSET;
385
386 error = i2c_smbus_write_byte_data(client, TEST1,
387 DUALTOUCH_STABILIZE_ON | DUALTOUCH_REG_ON);
388 if (error)
389 goto out;
390
391 first_time = false;
392 } else {
393 /* generate adjustment parameter */
394 err_x = (int)READ_CALIB_BUF(PRM1_X_H) << 2 |
395 READ_CALIB_BUF(PRM1_X_L);
396 err_y = (int)READ_CALIB_BUF(PRM1_Y_H) << 2 |
397 READ_CALIB_BUF(PRM1_Y_L);
398
399 /* X axis ajust */
400 if (err_x <= 4)
401 calib_x -= AXIS_ADJUST;
402 else if (err_x >= 60)
403 calib_x += AXIS_ADJUST;
404
405 /* Y axis ajust */
406 if (err_y <= 4)
407 calib_y -= AXIS_ADJUST;
408 else if (err_y >= 60)
409 calib_y += AXIS_ADJUST;
410 }
411
412 /* generate calibration setting value */
413 reg_x = calib_x + ((calib_x & 0x200) << 1);
414 reg_y = calib_y + ((calib_y & 0x200) << 1);
415
416 /* convert for register format */
417 reg1 = reg_x >> 3;
418 reg2 = (reg_y & 0x7) << 4 | (reg_x & 0x7);
419 reg3 = reg_y >> 3;
420
421 error = i2c_smbus_write_byte_data(client,
422 CALIBRATION_REG1, reg1);
423 if (error)
424 goto out;
425
426 error = i2c_smbus_write_byte_data(client,
427 CALIBRATION_REG2, reg2);
428 if (error)
429 goto out;
430
431 error = i2c_smbus_write_byte_data(client,
432 CALIBRATION_REG3, reg3);
433 if (error)
434 goto out;
435
436 /*
437 * force calibration sequcence
438 */
439 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
440 FORCE_CALIBRATION_OFF);
441 if (error)
442 goto out;
443
444 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
445 FORCE_CALIBRATION_ON);
446 if (error)
447 goto out;
448
449 /* clear all interrupts */
450 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
451 if (error)
452 goto out;
453
454 /*
455 * Wait for the status change of calibration, max 10 sampling
456 */
457 calibration_done = false;
458
459 for (i = 0; i < 10; i++) {
460 mdelay(SAMPLING_DELAY);
461
462 val = i2c_smbus_read_byte_data(client, TOUCH_GESTURE);
463 if (!(val & CALIBRATION_MASK)) {
464 calibration_done = true;
465 break;
466 } else if (val < 0) {
467 error = val;
468 goto out;
469 }
470 }
471
472 if (calibration_done) {
473 val = i2c_smbus_read_byte_data(client, INT_STATUS);
474 if (val == CALIBRATION_DONE) {
475 success = true;
476 break;
477 } else if (val < 0) {
478 error = val;
479 goto out;
480 }
481 } else {
482 dev_warn(dev, "calibration timeout\n");
483 }
484 }
485
486 if (!success) {
487 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
488 reg1_orig);
489 if (error)
490 goto out;
491
492 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
493 reg2_orig);
494 if (error)
495 goto out;
496
497 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
498 reg3_orig);
499 if (error)
500 goto out;
501
502 /* calibration data enable */
503 error = i2c_smbus_write_byte_data(client, TEST1,
504 DUALTOUCH_STABILIZE_ON |
505 DUALTOUCH_REG_ON);
506 if (error)
507 goto out;
508
509 /* wait 10 sampling */
510 mdelay(10 * SAMPLING_DELAY);
511
512 error = -EBUSY;
513 }
514
515out:
516 error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
517 if (!error2)
518 /* Clear all interrupts */
519 error2 = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
520
521 return error ? error : error2;
522}
523
524static const unsigned int untouch_threshold[3] = { 0, 1, 5 };
525static const unsigned int single_touch_threshold[3] = { 0, 0, 4 };
526static const unsigned int dual_touch_threshold[3] = { 10, 8, 0 };
527
528static irqreturn_t rohm_ts_soft_irq(int irq, void *dev_id)
529{
530 struct rohm_ts_data *ts = dev_id;
531 struct i2c_client *client = ts->client;
532 struct input_dev *input_dev = ts->input;
533 struct device *dev = &client->dev;
534
535 u8 buf[10]; /* for POS_X1_H(0x20)-TOUCH_GESTURE(0x29) */
536
537 struct input_mt_pos pos[MAX_CONTACTS];
538 int slots[MAX_CONTACTS];
539 u8 touch_flags;
540 unsigned int threshold;
541 int finger_count = -1;
542 int prev_finger_count = ts->finger_count;
543 int count;
544 int error;
545 int i;
546
547 error = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
548 if (error)
549 return IRQ_HANDLED;
550
551 /* Clear all interrupts */
552 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
553 if (error)
554 return IRQ_HANDLED;
555
556#define READ_POS_BUF(reg) buf[((reg) - POS_X1_H)]
557
558 error = rohm_i2c_burst_read(client, POS_X1_H, buf, sizeof(buf));
559 if (error)
560 return IRQ_HANDLED;
561
562 touch_flags = READ_POS_BUF(TOUCH_GESTURE) & TOUCH_MASK;
563 if (touch_flags) {
564 /* generate coordinates */
565 pos[0].x = ((s16)READ_POS_BUF(POS_X1_H) << 2) |
566 READ_POS_BUF(POS_X1_L);
567 pos[0].y = ((s16)READ_POS_BUF(POS_Y1_H) << 2) |
568 READ_POS_BUF(POS_Y1_L);
569 pos[1].x = ((s16)READ_POS_BUF(POS_X2_H) << 2) |
570 READ_POS_BUF(POS_X2_L);
571 pos[1].y = ((s16)READ_POS_BUF(POS_Y2_H) << 2) |
572 READ_POS_BUF(POS_Y2_L);
573 }
574
575 switch (touch_flags) {
576 case 0:
577 threshold = untouch_threshold[prev_finger_count];
578 if (++ts->contact_count[0] >= threshold)
579 finger_count = 0;
580 break;
581
582 case SINGLE_TOUCH:
583 threshold = single_touch_threshold[prev_finger_count];
584 if (++ts->contact_count[1] >= threshold)
585 finger_count = 1;
586
587 if (finger_count == 1) {
588 if (pos[1].x != 0 && pos[1].y != 0) {
589 pos[0].x = pos[1].x;
590 pos[0].y = pos[1].y;
591 pos[1].x = 0;
592 pos[1].y = 0;
593 }
594 }
595 break;
596
597 case DUAL_TOUCH:
598 threshold = dual_touch_threshold[prev_finger_count];
599 if (++ts->contact_count[2] >= threshold)
600 finger_count = 2;
601 break;
602
603 default:
604 dev_dbg(dev,
605 "Three or more touches are not supported\n");
606 return IRQ_HANDLED;
607 }
608
609 if (finger_count >= 0) {
610 if (prev_finger_count != finger_count) {
611 count = ts->contact_count[finger_count];
612 memset(ts->contact_count, 0, sizeof(ts->contact_count));
613 ts->contact_count[finger_count] = count;
614 }
615
616 input_mt_assign_slots(input_dev, slots, pos,
617 finger_count, ROHM_TS_DISPLACEMENT_MAX);
618
619 for (i = 0; i < finger_count; i++) {
620 input_mt_slot(input_dev, slots[i]);
621 input_mt_report_slot_state(input_dev,
622 MT_TOOL_FINGER, true);
623 input_report_abs(input_dev,
624 ABS_MT_POSITION_X, pos[i].x);
625 input_report_abs(input_dev,
626 ABS_MT_POSITION_Y, pos[i].y);
627 }
628
629 input_mt_sync_frame(input_dev);
630 input_mt_report_pointer_emulation(input_dev, true);
631 input_sync(input_dev);
632
633 ts->finger_count = finger_count;
634 }
635
636 if (READ_POS_BUF(TOUCH_GESTURE) & CALIBRATION_REQUEST) {
637 error = rohm_ts_manual_calibration(ts);
638 if (error)
639 dev_warn(dev, "manual calibration failed: %d\n",
640 error);
641 }
642
643 i2c_smbus_write_byte_data(client, INT_MASK,
644 CALIBRATION_DONE | SLEEP_OUT | SLEEP_IN |
645 PROGRAM_LOAD_DONE);
646
647 return IRQ_HANDLED;
648}
649
650static int rohm_ts_load_firmware(struct i2c_client *client,
651 const char *firmware_name)
652{
653 struct device *dev = &client->dev;
654 const struct firmware *fw;
655 s32 status;
656 unsigned int offset, len, xfer_len;
657 unsigned int retry = 0;
658 int error, error2;
659
660 error = request_firmware(&fw, firmware_name, dev);
661 if (error) {
662 dev_err(dev, "unable to retrieve firmware %s: %d\n",
663 firmware_name, error);
664 return error;
665 }
666
667 error = i2c_smbus_write_byte_data(client, INT_MASK,
668 COORD_UPDATE | CALIBRATION_DONE |
669 SLEEP_IN | SLEEP_OUT);
670 if (error)
671 goto out;
672
673 do {
674 if (retry) {
675 dev_warn(dev, "retrying firmware load\n");
676
677 /* settings for retry */
678 error = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
679 if (error)
680 goto out;
681 }
682
683 error = i2c_smbus_write_byte_data(client, EX_ADDR_H, 0);
684 if (error)
685 goto out;
686
687 error = i2c_smbus_write_byte_data(client, EX_ADDR_L, 0);
688 if (error)
689 goto out;
690
691 error = i2c_smbus_write_byte_data(client, COMMON_SETUP1,
692 COMMON_SETUP1_DEFAULT);
693 if (error)
694 goto out;
695
696 /* firmware load to the device */
697 offset = 0;
698 len = fw->size;
699
700 while (len) {
701 xfer_len = min(FIRMWARE_BLOCK_SIZE, len);
702
703 error = i2c_smbus_write_i2c_block_data(client, EX_WDAT,
704 xfer_len, &fw->data[offset]);
705 if (error)
706 goto out;
707
708 len -= xfer_len;
709 offset += xfer_len;
710 }
711
712 /* check firmware load result */
713 status = i2c_smbus_read_byte_data(client, INT_STATUS);
714 if (status < 0) {
715 error = status;
716 goto out;
717 }
718
719 /* clear all interrupts */
720 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
721 if (error)
722 goto out;
723
724 if (status == PROGRAM_LOAD_DONE)
725 break;
726
727 error = -EIO;
728 } while (++retry <= FIRMWARE_RETRY_MAX);
729
730out:
731 error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
732
733 release_firmware(fw);
734
735 return error ? error : error2;
736}
737
738static ssize_t swap_xy_show(struct device *dev, struct device_attribute *attr,
739 char *buf)
740{
741 struct i2c_client *client = to_i2c_client(dev);
742 struct rohm_ts_data *ts = i2c_get_clientdata(client);
743
744 return sprintf(buf, "%d\n", !!(ts->setup2 & SWAP_XY));
745}
746
747static ssize_t swap_xy_store(struct device *dev, struct device_attribute *attr,
748 const char *buf, size_t count)
749{
750 struct i2c_client *client = to_i2c_client(dev);
751 struct rohm_ts_data *ts = i2c_get_clientdata(client);
752 unsigned int val;
753 int error;
754
755 error = kstrtouint(buf, 0, &val);
756 if (error)
757 return error;
758
759 error = mutex_lock_interruptible(&ts->input->mutex);
760 if (error)
761 return error;
762
763 if (val)
764 ts->setup2 |= SWAP_XY;
765 else
766 ts->setup2 &= ~SWAP_XY;
767
768 if (ts->initialized)
769 error = i2c_smbus_write_byte_data(ts->client, COMMON_SETUP2,
770 ts->setup2);
771
772 mutex_unlock(&ts->input->mutex);
773
774 return error ? error : count;
775}
776
777static ssize_t inv_x_show(struct device *dev, struct device_attribute *attr,
778 char *buf)
779{
780 struct i2c_client *client = to_i2c_client(dev);
781 struct rohm_ts_data *ts = i2c_get_clientdata(client);
782
783 return sprintf(buf, "%d\n", !!(ts->setup2 & INV_X));
784}
785
786static ssize_t inv_x_store(struct device *dev, struct device_attribute *attr,
787 const char *buf, size_t count)
788{
789 struct i2c_client *client = to_i2c_client(dev);
790 struct rohm_ts_data *ts = i2c_get_clientdata(client);
791 unsigned int val;
792 int error;
793
794 error = kstrtouint(buf, 0, &val);
795 if (error)
796 return error;
797
798 error = mutex_lock_interruptible(&ts->input->mutex);
799 if (error)
800 return error;
801
802 if (val)
803 ts->setup2 |= INV_X;
804 else
805 ts->setup2 &= ~INV_X;
806
807 if (ts->initialized)
808 error = i2c_smbus_write_byte_data(ts->client, COMMON_SETUP2,
809 ts->setup2);
810
811 mutex_unlock(&ts->input->mutex);
812
813 return error ? error : count;
814}
815
816static ssize_t inv_y_show(struct device *dev, struct device_attribute *attr,
817 char *buf)
818{
819 struct i2c_client *client = to_i2c_client(dev);
820 struct rohm_ts_data *ts = i2c_get_clientdata(client);
821
822 return sprintf(buf, "%d\n", !!(ts->setup2 & INV_Y));
823}
824
825static ssize_t inv_y_store(struct device *dev, struct device_attribute *attr,
826 const char *buf, size_t count)
827{
828 struct i2c_client *client = to_i2c_client(dev);
829 struct rohm_ts_data *ts = i2c_get_clientdata(client);
830 unsigned int val;
831 int error;
832
833 error = kstrtouint(buf, 0, &val);
834 if (error)
835 return error;
836
837 error = mutex_lock_interruptible(&ts->input->mutex);
838 if (error)
839 return error;
840
841 if (val)
842 ts->setup2 |= INV_Y;
843 else
844 ts->setup2 &= ~INV_Y;
845
846 if (ts->initialized)
847 error = i2c_smbus_write_byte_data(client, COMMON_SETUP2,
848 ts->setup2);
849
850 mutex_unlock(&ts->input->mutex);
851
852 return error ? error : count;
853}
854
855static DEVICE_ATTR_RW(swap_xy);
856static DEVICE_ATTR_RW(inv_x);
857static DEVICE_ATTR_RW(inv_y);
858
859static struct attribute *rohm_ts_attrs[] = {
860 &dev_attr_swap_xy.attr,
861 &dev_attr_inv_x.attr,
862 &dev_attr_inv_y.attr,
863 NULL,
864};
865
866static const struct attribute_group rohm_ts_attr_group = {
867 .attrs = rohm_ts_attrs,
868};
869
870static int rohm_ts_device_init(struct i2c_client *client, u8 setup2)
871{
872 struct device *dev = &client->dev;
873 int error;
874
875 disable_irq(client->irq);
876
877 /*
878 * Wait 200usec for reset
879 */
880 udelay(200);
881
882 /* Release analog reset */
883 error = i2c_smbus_write_byte_data(client, SYSTEM,
884 ANALOG_POWER_ON | CPU_POWER_OFF);
885 if (error)
886 return error;
887
888 /* Waiting for the analog warm-up, max. 200usec */
889 udelay(200);
890
891 /* clear all interrupts */
892 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
893 if (error)
894 return error;
895
896 error = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
897 if (error)
898 return error;
899
900 error = i2c_smbus_write_byte_data(client, COMMON_SETUP1, 0);
901 if (error)
902 return error;
903
904 error = i2c_smbus_write_byte_data(client, COMMON_SETUP2, setup2);
905 if (error)
906 return error;
907
908 error = i2c_smbus_write_byte_data(client, COMMON_SETUP3,
909 SEL_TBL_DEFAULT | EN_MULTI);
910 if (error)
911 return error;
912
913 error = i2c_smbus_write_byte_data(client, THRESHOLD_GESTURE,
914 THRESHOLD_GESTURE_DEFAULT);
915 if (error)
916 return error;
917
918 error = i2c_smbus_write_byte_data(client, INTERVAL_TIME,
919 INTERVAL_TIME_DEFAULT);
920 if (error)
921 return error;
922
923 error = i2c_smbus_write_byte_data(client, CPU_FREQ, CPU_FREQ_10MHZ);
924 if (error)
925 return error;
926
927 error = i2c_smbus_write_byte_data(client, PRM_SWOFF_TIME,
928 PRM_SWOFF_TIME_DEFAULT);
929 if (error)
930 return error;
931
932 error = i2c_smbus_write_byte_data(client, ADC_CTRL, ADC_DIV_DEFAULT);
933 if (error)
934 return error;
935
936 error = i2c_smbus_write_byte_data(client, ADC_WAIT, ADC_WAIT_DEFAULT);
937 if (error)
938 return error;
939
940 /*
941 * Panel setup, these values change with the panel.
942 */
943 error = i2c_smbus_write_byte_data(client, STEP_X, STEP_X_DEFAULT);
944 if (error)
945 return error;
946
947 error = i2c_smbus_write_byte_data(client, STEP_Y, STEP_Y_DEFAULT);
948 if (error)
949 return error;
950
951 error = i2c_smbus_write_byte_data(client, OFFSET_X, OFFSET_X_DEFAULT);
952 if (error)
953 return error;
954
955 error = i2c_smbus_write_byte_data(client, OFFSET_Y, OFFSET_Y_DEFAULT);
956 if (error)
957 return error;
958
959 error = i2c_smbus_write_byte_data(client, THRESHOLD_TOUCH,
960 THRESHOLD_TOUCH_DEFAULT);
961 if (error)
962 return error;
963
964 error = i2c_smbus_write_byte_data(client, EVR_XY, EVR_XY_DEFAULT);
965 if (error)
966 return error;
967
968 error = i2c_smbus_write_byte_data(client, EVR_X, EVR_X_DEFAULT);
969 if (error)
970 return error;
971
972 error = i2c_smbus_write_byte_data(client, EVR_Y, EVR_Y_DEFAULT);
973 if (error)
974 return error;
975
976 /* Fixed value settings */
977 error = i2c_smbus_write_byte_data(client, CALIBRATION_ADJUST,
978 CALIBRATION_ADJUST_DEFAULT);
979 if (error)
980 return error;
981
982 error = i2c_smbus_write_byte_data(client, SWCONT, SWCONT_DEFAULT);
983 if (error)
984 return error;
985
986 error = i2c_smbus_write_byte_data(client, TEST1,
987 DUALTOUCH_STABILIZE_ON |
988 DUALTOUCH_REG_ON);
989 if (error)
990 return error;
991
992 error = rohm_ts_load_firmware(client, BU21023_FIRMWARE_NAME);
993 if (error) {
994 dev_err(dev, "failed to load firmware: %d\n", error);
995 return error;
996 }
997
998 /*
999 * Manual calibration results are not changed in same environment.
1000 * If the force calibration is performed,
1001 * the controller will not require calibration request interrupt
1002 * when the typical values are set to the calibration registers.
1003 */
1004 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
1005 CALIBRATION_REG1_DEFAULT);
1006 if (error)
1007 return error;
1008
1009 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
1010 CALIBRATION_REG2_DEFAULT);
1011 if (error)
1012 return error;
1013
1014 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
1015 CALIBRATION_REG3_DEFAULT);
1016 if (error)
1017 return error;
1018
1019 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
1020 FORCE_CALIBRATION_OFF);
1021 if (error)
1022 return error;
1023
1024 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
1025 FORCE_CALIBRATION_ON);
1026 if (error)
1027 return error;
1028
1029 /* Clear all interrupts */
1030 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
1031 if (error)
1032 return error;
1033
1034 /* Enable coordinates update interrupt */
1035 error = i2c_smbus_write_byte_data(client, INT_MASK,
1036 CALIBRATION_DONE | SLEEP_OUT |
1037 SLEEP_IN | PROGRAM_LOAD_DONE);
1038 if (error)
1039 return error;
1040
1041 error = i2c_smbus_write_byte_data(client, ERR_MASK,
1042 PROGRAM_LOAD_ERR | CPU_TIMEOUT |
1043 ADC_TIMEOUT);
1044 if (error)
1045 return error;
1046
1047 /* controller CPU power on */
1048 error = i2c_smbus_write_byte_data(client, SYSTEM,
1049 ANALOG_POWER_ON | CPU_POWER_ON);
1050
1051 enable_irq(client->irq);
1052
1053 return error;
1054}
1055
1056static int rohm_ts_power_off(struct i2c_client *client)
1057{
1058 int error;
1059
1060 error = i2c_smbus_write_byte_data(client, SYSTEM,
1061 ANALOG_POWER_ON | CPU_POWER_OFF);
1062 if (error) {
1063 dev_err(&client->dev,
1064 "failed to power off device CPU: %d\n", error);
1065 return error;
1066 }
1067
1068 error = i2c_smbus_write_byte_data(client, SYSTEM,
1069 ANALOG_POWER_OFF | CPU_POWER_OFF);
1070 if (error)
1071 dev_err(&client->dev,
1072 "failed to power off the device: %d\n", error);
1073
1074 return error;
1075}
1076
1077static int rohm_ts_open(struct input_dev *input_dev)
1078{
1079 struct rohm_ts_data *ts = input_get_drvdata(input_dev);
1080 struct i2c_client *client = ts->client;
1081 int error;
1082
1083 if (!ts->initialized) {
1084 error = rohm_ts_device_init(client, ts->setup2);
1085 if (error) {
1086 dev_err(&client->dev,
1087 "device initialization failed: %d\n", error);
1088 return error;
1089 }
1090
1091 ts->initialized = true;
1092 }
1093
1094 return 0;
1095}
1096
1097static void rohm_ts_close(struct input_dev *input_dev)
1098{
1099 struct rohm_ts_data *ts = input_get_drvdata(input_dev);
1100
1101 rohm_ts_power_off(ts->client);
1102
1103 ts->initialized = false;
1104}
1105
1106static void rohm_ts_remove_sysfs_group(void *_dev)
1107{
1108 struct device *dev = _dev;
1109
1110 sysfs_remove_group(&dev->kobj, &rohm_ts_attr_group);
1111}
1112
1113static int rohm_bu21023_i2c_probe(struct i2c_client *client,
1114 const struct i2c_device_id *id)
1115{
1116 struct device *dev = &client->dev;
1117 struct rohm_ts_data *ts;
1118 struct input_dev *input;
1119 int error;
1120
1121 if (!client->irq) {
1122 dev_err(dev, "IRQ is not assigned\n");
1123 return -EINVAL;
1124 }
1125
1126 if (!client->adapter->algo->master_xfer) {
1127 dev_err(dev, "I2C level transfers not supported\n");
1128 return -EOPNOTSUPP;
1129 }
1130
1131 /* Turn off CPU just in case */
1132 error = rohm_ts_power_off(client);
1133 if (error)
1134 return error;
1135
1136 ts = devm_kzalloc(dev, sizeof(struct rohm_ts_data), GFP_KERNEL);
1137 if (!ts)
1138 return -ENOMEM;
1139
1140 ts->client = client;
1141 ts->setup2 = MAF_1SAMPLE;
1142 i2c_set_clientdata(client, ts);
1143
1144 input = devm_input_allocate_device(dev);
1145 if (!input)
1146 return -ENOMEM;
1147
1148 input->name = BU21023_NAME;
1149 input->id.bustype = BUS_I2C;
1150 input->open = rohm_ts_open;
1151 input->close = rohm_ts_close;
1152
1153 ts->input = input;
1154 input_set_drvdata(input, ts);
1155
1156 input_set_abs_params(input, ABS_MT_POSITION_X,
1157 ROHM_TS_ABS_X_MIN, ROHM_TS_ABS_X_MAX, 0, 0);
1158 input_set_abs_params(input, ABS_MT_POSITION_Y,
1159 ROHM_TS_ABS_Y_MIN, ROHM_TS_ABS_Y_MAX, 0, 0);
1160
1161 error = input_mt_init_slots(input, MAX_CONTACTS,
1162 INPUT_MT_DIRECT | INPUT_MT_TRACK |
1163 INPUT_MT_DROP_UNUSED);
1164 if (error) {
1165 dev_err(dev, "failed to multi touch slots initialization\n");
1166 return error;
1167 }
1168
1169 error = devm_request_threaded_irq(dev, client->irq,
1170 NULL, rohm_ts_soft_irq,
1171 IRQF_ONESHOT, client->name, ts);
1172 if (error) {
1173 dev_err(dev, "failed to request IRQ: %d\n", error);
1174 return error;
1175 }
1176
1177 error = input_register_device(input);
1178 if (error) {
1179 dev_err(dev, "failed to register input device: %d\n", error);
1180 return error;
1181 }
1182
1183 error = sysfs_create_group(&dev->kobj, &rohm_ts_attr_group);
1184 if (error) {
1185 dev_err(dev, "failed to create sysfs group: %d\n", error);
1186 return error;
1187 }
1188
1189 error = devm_add_action(dev, rohm_ts_remove_sysfs_group, dev);
1190 if (error) {
1191 rohm_ts_remove_sysfs_group(dev);
1192 dev_err(&client->dev,
1193 "Failed to add sysfs cleanup action: %d\n",
1194 error);
1195 return error;
1196 }
1197
1198 return error;
1199}
1200
1201static const struct i2c_device_id rohm_bu21023_i2c_id[] = {
1202 { BU21023_NAME, 0 },
1203 { /* sentinel */ }
1204};
1205MODULE_DEVICE_TABLE(i2c, rohm_bu21023_i2c_id);
1206
1207static struct i2c_driver rohm_bu21023_i2c_driver = {
1208 .driver = {
1209 .name = BU21023_NAME,
1210 },
1211 .probe = rohm_bu21023_i2c_probe,
1212 .id_table = rohm_bu21023_i2c_id,
1213};
1214module_i2c_driver(rohm_bu21023_i2c_driver);
1215
1216MODULE_DESCRIPTION("ROHM BU21023/24 Touchscreen driver");
1217MODULE_LICENSE("GPL v2");
1218MODULE_AUTHOR("ROHM Co., Ltd.");