1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ROHM BU21023/24 Dual touch support resistive touch screen driver
4 * Copyright (C) 2012 ROHM CO.,LTD.
5 */
6 #include <linux/delay.h>
7 #include <linux/firmware.h>
8 #include <linux/i2c.h>
9 #include <linux/input.h>
10 #include <linux/input/mt.h>
11 #include <linux/interrupt.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14
15 #define BU21023_NAME "bu21023_ts"
16 #define BU21023_FIRMWARE_NAME "bu21023.bin"
17
18 #define MAX_CONTACTS 2
19
20 #define AXIS_ADJUST 4
21 #define AXIS_OFFSET 8
22
23 #define FIRMWARE_BLOCK_SIZE 32U
24 #define FIRMWARE_RETRY_MAX 4
25
26 #define SAMPLING_DELAY 12 /* msec */
27
28 #define CALIBRATION_RETRY_MAX 6
29
30 #define ROHM_TS_ABS_X_MIN 40
31 #define ROHM_TS_ABS_X_MAX 990
32 #define ROHM_TS_ABS_Y_MIN 160
33 #define ROHM_TS_ABS_Y_MAX 920
34 #define ROHM_TS_DISPLACEMENT_MAX 0 /* zero for infinite */
35
36 /*
37 * BU21023GUL/BU21023MUV/BU21024FV-M registers map
38 */
39 #define VADOUT_YP_H 0x00
40 #define VADOUT_YP_L 0x01
41 #define VADOUT_XP_H 0x02
42 #define VADOUT_XP_L 0x03
43 #define VADOUT_YN_H 0x04
44 #define VADOUT_YN_L 0x05
45 #define VADOUT_XN_H 0x06
46 #define VADOUT_XN_L 0x07
47
48 #define PRM1_X_H 0x08
49 #define PRM1_X_L 0x09
50 #define PRM1_Y_H 0x0a
51 #define PRM1_Y_L 0x0b
52 #define PRM2_X_H 0x0c
53 #define PRM2_X_L 0x0d
54 #define PRM2_Y_H 0x0e
55 #define PRM2_Y_L 0x0f
56
57 #define MLT_PRM_MONI_X 0x10
58 #define MLT_PRM_MONI_Y 0x11
59
60 #define DEBUG_MONI_1 0x12
61 #define DEBUG_MONI_2 0x13
62
63 #define VADOUT_ZX_H 0x14
64 #define VADOUT_ZX_L 0x15
65 #define VADOUT_ZY_H 0x16
66 #define VADOUT_ZY_L 0x17
67
68 #define Z_PARAM_H 0x18
69 #define Z_PARAM_L 0x19
70
71 /*
72 * Value for VADOUT_*_L
73 */
74 #define VADOUT_L_MASK 0x01
75
76 /*
77 * Value for PRM*_*_L
78 */
79 #define PRM_L_MASK 0x01
80
81 #define POS_X1_H 0x20
82 #define POS_X1_L 0x21
83 #define POS_Y1_H 0x22
84 #define POS_Y1_L 0x23
85 #define POS_X2_H 0x24
86 #define POS_X2_L 0x25
87 #define POS_Y2_H 0x26
88 #define POS_Y2_L 0x27
89
90 /*
91 * Value for POS_*_L
92 */
93 #define POS_L_MASK 0x01
94
95 #define TOUCH 0x28
96 #define TOUCH_DETECT 0x01
97
98 #define TOUCH_GESTURE 0x29
99 #define SINGLE_TOUCH 0x01
100 #define DUAL_TOUCH 0x03
101 #define TOUCH_MASK 0x03
102 #define CALIBRATION_REQUEST 0x04
103 #define CALIBRATION_STATUS 0x08
104 #define CALIBRATION_MASK 0x0c
105 #define GESTURE_SPREAD 0x10
106 #define GESTURE_PINCH 0x20
107 #define GESTURE_ROTATE_R 0x40
108 #define GESTURE_ROTATE_L 0x80
109
110 #define INT_STATUS 0x2a
111 #define INT_MASK 0x3d
112 #define INT_CLEAR 0x3e
113
114 /*
115 * Values for INT_*
116 */
117 #define COORD_UPDATE 0x01
118 #define CALIBRATION_DONE 0x02
119 #define SLEEP_IN 0x04
120 #define SLEEP_OUT 0x08
121 #define PROGRAM_LOAD_DONE 0x10
122 #define ERROR 0x80
123 #define INT_ALL 0x9f
124
125 #define ERR_STATUS 0x2b
126 #define ERR_MASK 0x3f
127
128 /*
129 * Values for ERR_*
130 */
131 #define ADC_TIMEOUT 0x01
132 #define CPU_TIMEOUT 0x02
133 #define CALIBRATION_ERR 0x04
134 #define PROGRAM_LOAD_ERR 0x10
135
136 #define COMMON_SETUP1 0x30
137 #define PROGRAM_LOAD_HOST 0x02
138 #define PROGRAM_LOAD_EEPROM 0x03
139 #define CENSOR_4PORT 0x04
140 #define CENSOR_8PORT 0x00 /* Not supported by BU21023 */
141 #define CALIBRATION_TYPE_DEFAULT 0x08
142 #define CALIBRATION_TYPE_SPECIAL 0x00
143 #define INT_ACTIVE_HIGH 0x10
144 #define INT_ACTIVE_LOW 0x00
145 #define AUTO_CALIBRATION 0x40
146 #define MANUAL_CALIBRATION 0x00
147 #define COMMON_SETUP1_DEFAULT 0x4e
148
149 #define COMMON_SETUP2 0x31
150 #define MAF_NONE 0x00
151 #define MAF_1SAMPLE 0x01
152 #define MAF_3SAMPLES 0x02
153 #define MAF_5SAMPLES 0x03
154 #define INV_Y 0x04
155 #define INV_X 0x08
156 #define SWAP_XY 0x10
157
158 #define COMMON_SETUP3 0x32
159 #define EN_SLEEP 0x01
160 #define EN_MULTI 0x02
161 #define EN_GESTURE 0x04
162 #define EN_INTVL 0x08
163 #define SEL_STEP 0x10
164 #define SEL_MULTI 0x20
165 #define SEL_TBL_DEFAULT 0x40
166
167 #define INTERVAL_TIME 0x33
168 #define INTERVAL_TIME_DEFAULT 0x10
169
170 #define STEP_X 0x34
171 #define STEP_X_DEFAULT 0x41
172
173 #define STEP_Y 0x35
174 #define STEP_Y_DEFAULT 0x8d
175
176 #define OFFSET_X 0x38
177 #define OFFSET_X_DEFAULT 0x0c
178
179 #define OFFSET_Y 0x39
180 #define OFFSET_Y_DEFAULT 0x0c
181
182 #define THRESHOLD_TOUCH 0x3a
183 #define THRESHOLD_TOUCH_DEFAULT 0xa0
184
185 #define THRESHOLD_GESTURE 0x3b
186 #define THRESHOLD_GESTURE_DEFAULT 0x17
187
188 #define SYSTEM 0x40
189 #define ANALOG_POWER_ON 0x01
190 #define ANALOG_POWER_OFF 0x00
191 #define CPU_POWER_ON 0x02
192 #define CPU_POWER_OFF 0x00
193
194 #define FORCE_CALIBRATION 0x42
195 #define FORCE_CALIBRATION_ON 0x01
196 #define FORCE_CALIBRATION_OFF 0x00
197
198 #define CPU_FREQ 0x50 /* 10 / (reg + 1) MHz */
199 #define CPU_FREQ_10MHZ 0x00
200 #define CPU_FREQ_5MHZ 0x01
201 #define CPU_FREQ_1MHZ 0x09
202
203 #define EEPROM_ADDR 0x51
204
205 #define CALIBRATION_ADJUST 0x52
206 #define CALIBRATION_ADJUST_DEFAULT 0x00
207
208 #define THRESHOLD_SLEEP_IN 0x53
209
210 #define EVR_XY 0x56
211 #define EVR_XY_DEFAULT 0x10
212
213 #define PRM_SWOFF_TIME 0x57
214 #define PRM_SWOFF_TIME_DEFAULT 0x04
215
216 #define PROGRAM_VERSION 0x5f
217
218 #define ADC_CTRL 0x60
219 #define ADC_DIV_MASK 0x1f /* The minimum value is 4 */
220 #define ADC_DIV_DEFAULT 0x08
221
222 #define ADC_WAIT 0x61
223 #define ADC_WAIT_DEFAULT 0x0a
224
225 #define SWCONT 0x62
226 #define SWCONT_DEFAULT 0x0f
227
228 #define EVR_X 0x63
229 #define EVR_X_DEFAULT 0x86
230
231 #define EVR_Y 0x64
232 #define EVR_Y_DEFAULT 0x64
233
234 #define TEST1 0x65
235 #define DUALTOUCH_STABILIZE_ON 0x01
236 #define DUALTOUCH_STABILIZE_OFF 0x00
237 #define DUALTOUCH_REG_ON 0x20
238 #define DUALTOUCH_REG_OFF 0x00
239
240 #define CALIBRATION_REG1 0x68
241 #define CALIBRATION_REG1_DEFAULT 0xd9
242
243 #define CALIBRATION_REG2 0x69
244 #define CALIBRATION_REG2_DEFAULT 0x36
245
246 #define CALIBRATION_REG3 0x6a
247 #define CALIBRATION_REG3_DEFAULT 0x32
248
249 #define EX_ADDR_H 0x70
250 #define EX_ADDR_L 0x71
251 #define EX_WDAT 0x72
252 #define EX_RDAT 0x73
253 #define EX_CHK_SUM1 0x74
254 #define EX_CHK_SUM2 0x75
255 #define EX_CHK_SUM3 0x76
256
257 struct rohm_ts_data {
258 struct i2c_client *client;
259 struct input_dev *input;
260
261 bool initialized;
262
263 unsigned int contact_count[MAX_CONTACTS + 1];
264 int finger_count;
265
266 u8 setup2;
267 };
268
269 /*
270 * rohm_i2c_burst_read - execute combined I2C message for ROHM BU21023/24
271 * @client: Handle to ROHM BU21023/24
272 * @start: Where to start read address from ROHM BU21023/24
273 * @buf: Where to store read data from ROHM BU21023/24
274 * @len: How many bytes to read
275 *
276 * Returns negative errno, else zero on success.
277 *
278 * Note
279 * In BU21023/24 burst read, stop condition is needed after "address write".
280 * Therefore, transmission is performed in 2 steps.
281 */
rohm_i2c_burst_read(struct i2c_client * client,u8 start,void * buf,size_t len)282 static int rohm_i2c_burst_read(struct i2c_client *client, u8 start, void *buf,
283 size_t len)
284 {
285 struct i2c_adapter *adap = client->adapter;
286 struct i2c_msg msg[2];
287 int i, ret = 0;
288
289 msg[0].addr = client->addr;
290 msg[0].flags = 0;
291 msg[0].len = 1;
292 msg[0].buf = &start;
293
294 msg[1].addr = client->addr;
295 msg[1].flags = I2C_M_RD;
296 msg[1].len = len;
297 msg[1].buf = buf;
298
299 i2c_lock_bus(adap, I2C_LOCK_SEGMENT);
300
301 for (i = 0; i < 2; i++) {
302 if (__i2c_transfer(adap, &msg[i], 1) < 0) {
303 ret = -EIO;
304 break;
305 }
306 }
307
308 i2c_unlock_bus(adap, I2C_LOCK_SEGMENT);
309
310 return ret;
311 }
312
rohm_ts_manual_calibration(struct rohm_ts_data * ts)313 static int rohm_ts_manual_calibration(struct rohm_ts_data *ts)
314 {
315 struct i2c_client *client = ts->client;
316 struct device *dev = &client->dev;
317 u8 buf[33]; /* for PRM1_X_H(0x08)-TOUCH(0x28) */
318
319 int retry;
320 bool success = false;
321 bool first_time = true;
322 bool calibration_done;
323
324 u8 reg1, reg2, reg3;
325 s32 reg1_orig, reg2_orig, reg3_orig;
326 s32 val;
327
328 int calib_x = 0, calib_y = 0;
329 int reg_x, reg_y;
330 int err_x, err_y;
331
332 int error, error2;
333 int i;
334
335 reg1_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG1);
336 if (reg1_orig < 0)
337 return reg1_orig;
338
339 reg2_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG2);
340 if (reg2_orig < 0)
341 return reg2_orig;
342
343 reg3_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG3);
344 if (reg3_orig < 0)
345 return reg3_orig;
346
347 error = i2c_smbus_write_byte_data(client, INT_MASK,
348 COORD_UPDATE | SLEEP_IN | SLEEP_OUT |
349 PROGRAM_LOAD_DONE);
350 if (error)
351 goto out;
352
353 error = i2c_smbus_write_byte_data(client, TEST1,
354 DUALTOUCH_STABILIZE_ON);
355 if (error)
356 goto out;
357
358 for (retry = 0; retry < CALIBRATION_RETRY_MAX; retry++) {
359 /* wait 2 sampling for update */
360 mdelay(2 * SAMPLING_DELAY);
361
362 #define READ_CALIB_BUF(reg) buf[((reg) - PRM1_X_H)]
363
364 error = rohm_i2c_burst_read(client, PRM1_X_H, buf, sizeof(buf));
365 if (error)
366 goto out;
367
368 if (READ_CALIB_BUF(TOUCH) & TOUCH_DETECT)
369 continue;
370
371 if (first_time) {
372 /* generate calibration parameter */
373 calib_x = ((int)READ_CALIB_BUF(PRM1_X_H) << 2 |
374 READ_CALIB_BUF(PRM1_X_L)) - AXIS_OFFSET;
375 calib_y = ((int)READ_CALIB_BUF(PRM1_Y_H) << 2 |
376 READ_CALIB_BUF(PRM1_Y_L)) - AXIS_OFFSET;
377
378 error = i2c_smbus_write_byte_data(client, TEST1,
379 DUALTOUCH_STABILIZE_ON | DUALTOUCH_REG_ON);
380 if (error)
381 goto out;
382
383 first_time = false;
384 } else {
385 /* generate adjustment parameter */
386 err_x = (int)READ_CALIB_BUF(PRM1_X_H) << 2 |
387 READ_CALIB_BUF(PRM1_X_L);
388 err_y = (int)READ_CALIB_BUF(PRM1_Y_H) << 2 |
389 READ_CALIB_BUF(PRM1_Y_L);
390
391 /* X axis ajust */
392 if (err_x <= 4)
393 calib_x -= AXIS_ADJUST;
394 else if (err_x >= 60)
395 calib_x += AXIS_ADJUST;
396
397 /* Y axis ajust */
398 if (err_y <= 4)
399 calib_y -= AXIS_ADJUST;
400 else if (err_y >= 60)
401 calib_y += AXIS_ADJUST;
402 }
403
404 /* generate calibration setting value */
405 reg_x = calib_x + ((calib_x & 0x200) << 1);
406 reg_y = calib_y + ((calib_y & 0x200) << 1);
407
408 /* convert for register format */
409 reg1 = reg_x >> 3;
410 reg2 = (reg_y & 0x7) << 4 | (reg_x & 0x7);
411 reg3 = reg_y >> 3;
412
413 error = i2c_smbus_write_byte_data(client,
414 CALIBRATION_REG1, reg1);
415 if (error)
416 goto out;
417
418 error = i2c_smbus_write_byte_data(client,
419 CALIBRATION_REG2, reg2);
420 if (error)
421 goto out;
422
423 error = i2c_smbus_write_byte_data(client,
424 CALIBRATION_REG3, reg3);
425 if (error)
426 goto out;
427
428 /*
429 * force calibration sequcence
430 */
431 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
432 FORCE_CALIBRATION_OFF);
433 if (error)
434 goto out;
435
436 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
437 FORCE_CALIBRATION_ON);
438 if (error)
439 goto out;
440
441 /* clear all interrupts */
442 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
443 if (error)
444 goto out;
445
446 /*
447 * Wait for the status change of calibration, max 10 sampling
448 */
449 calibration_done = false;
450
451 for (i = 0; i < 10; i++) {
452 mdelay(SAMPLING_DELAY);
453
454 val = i2c_smbus_read_byte_data(client, TOUCH_GESTURE);
455 if (!(val & CALIBRATION_MASK)) {
456 calibration_done = true;
457 break;
458 } else if (val < 0) {
459 error = val;
460 goto out;
461 }
462 }
463
464 if (calibration_done) {
465 val = i2c_smbus_read_byte_data(client, INT_STATUS);
466 if (val == CALIBRATION_DONE) {
467 success = true;
468 break;
469 } else if (val < 0) {
470 error = val;
471 goto out;
472 }
473 } else {
474 dev_warn(dev, "calibration timeout\n");
475 }
476 }
477
478 if (!success) {
479 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
480 reg1_orig);
481 if (error)
482 goto out;
483
484 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
485 reg2_orig);
486 if (error)
487 goto out;
488
489 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
490 reg3_orig);
491 if (error)
492 goto out;
493
494 /* calibration data enable */
495 error = i2c_smbus_write_byte_data(client, TEST1,
496 DUALTOUCH_STABILIZE_ON |
497 DUALTOUCH_REG_ON);
498 if (error)
499 goto out;
500
501 /* wait 10 sampling */
502 mdelay(10 * SAMPLING_DELAY);
503
504 error = -EBUSY;
505 }
506
507 out:
508 error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
509 if (!error2)
510 /* Clear all interrupts */
511 error2 = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
512
513 return error ? error : error2;
514 }
515
516 static const unsigned int untouch_threshold[3] = { 0, 1, 5 };
517 static const unsigned int single_touch_threshold[3] = { 0, 0, 4 };
518 static const unsigned int dual_touch_threshold[3] = { 10, 8, 0 };
519
rohm_ts_soft_irq(int irq,void * dev_id)520 static irqreturn_t rohm_ts_soft_irq(int irq, void *dev_id)
521 {
522 struct rohm_ts_data *ts = dev_id;
523 struct i2c_client *client = ts->client;
524 struct input_dev *input_dev = ts->input;
525 struct device *dev = &client->dev;
526
527 u8 buf[10]; /* for POS_X1_H(0x20)-TOUCH_GESTURE(0x29) */
528
529 struct input_mt_pos pos[MAX_CONTACTS];
530 int slots[MAX_CONTACTS];
531 u8 touch_flags;
532 unsigned int threshold;
533 int finger_count = -1;
534 int prev_finger_count = ts->finger_count;
535 int count;
536 int error;
537 int i;
538
539 error = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
540 if (error)
541 return IRQ_HANDLED;
542
543 /* Clear all interrupts */
544 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
545 if (error)
546 return IRQ_HANDLED;
547
548 #define READ_POS_BUF(reg) buf[((reg) - POS_X1_H)]
549
550 error = rohm_i2c_burst_read(client, POS_X1_H, buf, sizeof(buf));
551 if (error)
552 return IRQ_HANDLED;
553
554 touch_flags = READ_POS_BUF(TOUCH_GESTURE) & TOUCH_MASK;
555 if (touch_flags) {
556 /* generate coordinates */
557 pos[0].x = ((s16)READ_POS_BUF(POS_X1_H) << 2) |
558 READ_POS_BUF(POS_X1_L);
559 pos[0].y = ((s16)READ_POS_BUF(POS_Y1_H) << 2) |
560 READ_POS_BUF(POS_Y1_L);
561 pos[1].x = ((s16)READ_POS_BUF(POS_X2_H) << 2) |
562 READ_POS_BUF(POS_X2_L);
563 pos[1].y = ((s16)READ_POS_BUF(POS_Y2_H) << 2) |
564 READ_POS_BUF(POS_Y2_L);
565 }
566
567 switch (touch_flags) {
568 case 0:
569 threshold = untouch_threshold[prev_finger_count];
570 if (++ts->contact_count[0] >= threshold)
571 finger_count = 0;
572 break;
573
574 case SINGLE_TOUCH:
575 threshold = single_touch_threshold[prev_finger_count];
576 if (++ts->contact_count[1] >= threshold)
577 finger_count = 1;
578
579 if (finger_count == 1) {
580 if (pos[1].x != 0 && pos[1].y != 0) {
581 pos[0].x = pos[1].x;
582 pos[0].y = pos[1].y;
583 pos[1].x = 0;
584 pos[1].y = 0;
585 }
586 }
587 break;
588
589 case DUAL_TOUCH:
590 threshold = dual_touch_threshold[prev_finger_count];
591 if (++ts->contact_count[2] >= threshold)
592 finger_count = 2;
593 break;
594
595 default:
596 dev_dbg(dev,
597 "Three or more touches are not supported\n");
598 return IRQ_HANDLED;
599 }
600
601 if (finger_count >= 0) {
602 if (prev_finger_count != finger_count) {
603 count = ts->contact_count[finger_count];
604 memset(ts->contact_count, 0, sizeof(ts->contact_count));
605 ts->contact_count[finger_count] = count;
606 }
607
608 input_mt_assign_slots(input_dev, slots, pos,
609 finger_count, ROHM_TS_DISPLACEMENT_MAX);
610
611 for (i = 0; i < finger_count; i++) {
612 input_mt_slot(input_dev, slots[i]);
613 input_mt_report_slot_state(input_dev,
614 MT_TOOL_FINGER, true);
615 input_report_abs(input_dev,
616 ABS_MT_POSITION_X, pos[i].x);
617 input_report_abs(input_dev,
618 ABS_MT_POSITION_Y, pos[i].y);
619 }
620
621 input_mt_sync_frame(input_dev);
622 input_mt_report_pointer_emulation(input_dev, true);
623 input_sync(input_dev);
624
625 ts->finger_count = finger_count;
626 }
627
628 if (READ_POS_BUF(TOUCH_GESTURE) & CALIBRATION_REQUEST) {
629 error = rohm_ts_manual_calibration(ts);
630 if (error)
631 dev_warn(dev, "manual calibration failed: %d\n",
632 error);
633 }
634
635 i2c_smbus_write_byte_data(client, INT_MASK,
636 CALIBRATION_DONE | SLEEP_OUT | SLEEP_IN |
637 PROGRAM_LOAD_DONE);
638
639 return IRQ_HANDLED;
640 }
641
rohm_ts_load_firmware(struct i2c_client * client,const char * firmware_name)642 static int rohm_ts_load_firmware(struct i2c_client *client,
643 const char *firmware_name)
644 {
645 struct device *dev = &client->dev;
646 s32 status;
647 unsigned int offset, len, xfer_len;
648 unsigned int retry = 0;
649 int error, error2;
650
651 const struct firmware *fw __free(firmware) = NULL;
652 error = request_firmware(&fw, firmware_name, dev);
653 if (error) {
654 dev_err(dev, "unable to retrieve firmware %s: %d\n",
655 firmware_name, error);
656 return error;
657 }
658
659 error = i2c_smbus_write_byte_data(client, INT_MASK,
660 COORD_UPDATE | CALIBRATION_DONE |
661 SLEEP_IN | SLEEP_OUT);
662 if (error)
663 goto out;
664
665 do {
666 if (retry) {
667 dev_warn(dev, "retrying firmware load\n");
668
669 /* settings for retry */
670 error = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
671 if (error)
672 goto out;
673 }
674
675 error = i2c_smbus_write_byte_data(client, EX_ADDR_H, 0);
676 if (error)
677 goto out;
678
679 error = i2c_smbus_write_byte_data(client, EX_ADDR_L, 0);
680 if (error)
681 goto out;
682
683 error = i2c_smbus_write_byte_data(client, COMMON_SETUP1,
684 COMMON_SETUP1_DEFAULT);
685 if (error)
686 goto out;
687
688 /* firmware load to the device */
689 offset = 0;
690 len = fw->size;
691
692 while (len) {
693 xfer_len = min(FIRMWARE_BLOCK_SIZE, len);
694
695 error = i2c_smbus_write_i2c_block_data(client, EX_WDAT,
696 xfer_len, &fw->data[offset]);
697 if (error)
698 goto out;
699
700 len -= xfer_len;
701 offset += xfer_len;
702 }
703
704 /* check firmware load result */
705 status = i2c_smbus_read_byte_data(client, INT_STATUS);
706 if (status < 0) {
707 error = status;
708 goto out;
709 }
710
711 /* clear all interrupts */
712 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
713 if (error)
714 goto out;
715
716 if (status == PROGRAM_LOAD_DONE)
717 break;
718
719 error = -EIO;
720 } while (++retry <= FIRMWARE_RETRY_MAX);
721
722 out:
723 error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
724
725 return error ? error : error2;
726 }
727
rohm_ts_update_setting(struct rohm_ts_data * ts,unsigned int setting_bit,bool on)728 static int rohm_ts_update_setting(struct rohm_ts_data *ts,
729 unsigned int setting_bit, bool on)
730 {
731 int error;
732
733 scoped_cond_guard(mutex_intr, return -EINTR, &ts->input->mutex) {
734 if (on)
735 ts->setup2 |= setting_bit;
736 else
737 ts->setup2 &= ~setting_bit;
738
739 if (ts->initialized) {
740 error = i2c_smbus_write_byte_data(ts->client,
741 COMMON_SETUP2,
742 ts->setup2);
743 if (error)
744 return error;
745 }
746 }
747
748 return 0;
749 }
750
swap_xy_show(struct device * dev,struct device_attribute * attr,char * buf)751 static ssize_t swap_xy_show(struct device *dev, struct device_attribute *attr,
752 char *buf)
753 {
754 struct i2c_client *client = to_i2c_client(dev);
755 struct rohm_ts_data *ts = i2c_get_clientdata(client);
756
757 return sysfs_emit(buf, "%d\n", !!(ts->setup2 & SWAP_XY));
758 }
759
swap_xy_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)760 static ssize_t swap_xy_store(struct device *dev, struct device_attribute *attr,
761 const char *buf, size_t count)
762 {
763 struct i2c_client *client = to_i2c_client(dev);
764 struct rohm_ts_data *ts = i2c_get_clientdata(client);
765 unsigned int val;
766 int error;
767
768 error = kstrtouint(buf, 0, &val);
769 if (error)
770 return error;
771
772 error = rohm_ts_update_setting(ts, SWAP_XY, val);
773 return error ?: count;
774 }
775
inv_x_show(struct device * dev,struct device_attribute * attr,char * buf)776 static ssize_t inv_x_show(struct device *dev, struct device_attribute *attr,
777 char *buf)
778 {
779 struct i2c_client *client = to_i2c_client(dev);
780 struct rohm_ts_data *ts = i2c_get_clientdata(client);
781
782 return sysfs_emit(buf, "%d\n", !!(ts->setup2 & INV_X));
783 }
784
inv_x_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)785 static ssize_t inv_x_store(struct device *dev, struct device_attribute *attr,
786 const char *buf, size_t count)
787 {
788 struct i2c_client *client = to_i2c_client(dev);
789 struct rohm_ts_data *ts = i2c_get_clientdata(client);
790 unsigned int val;
791 int error;
792
793 error = kstrtouint(buf, 0, &val);
794 if (error)
795 return error;
796
797 error = rohm_ts_update_setting(ts, INV_X, val);
798 return error ?: count;
799 }
800
inv_y_show(struct device * dev,struct device_attribute * attr,char * buf)801 static ssize_t inv_y_show(struct device *dev, struct device_attribute *attr,
802 char *buf)
803 {
804 struct i2c_client *client = to_i2c_client(dev);
805 struct rohm_ts_data *ts = i2c_get_clientdata(client);
806
807 return sysfs_emit(buf, "%d\n", !!(ts->setup2 & INV_Y));
808 }
809
inv_y_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)810 static ssize_t inv_y_store(struct device *dev, struct device_attribute *attr,
811 const char *buf, size_t count)
812 {
813 struct i2c_client *client = to_i2c_client(dev);
814 struct rohm_ts_data *ts = i2c_get_clientdata(client);
815 unsigned int val;
816 int error;
817
818 error = kstrtouint(buf, 0, &val);
819 if (error)
820 return error;
821
822 error = rohm_ts_update_setting(ts, INV_Y, val);
823 return error ?: count;
824 }
825
826 static DEVICE_ATTR_RW(swap_xy);
827 static DEVICE_ATTR_RW(inv_x);
828 static DEVICE_ATTR_RW(inv_y);
829
830 static struct attribute *rohm_ts_attrs[] = {
831 &dev_attr_swap_xy.attr,
832 &dev_attr_inv_x.attr,
833 &dev_attr_inv_y.attr,
834 NULL,
835 };
836 ATTRIBUTE_GROUPS(rohm_ts);
837
rohm_ts_device_init(struct i2c_client * client,u8 setup2)838 static int rohm_ts_device_init(struct i2c_client *client, u8 setup2)
839 {
840 struct device *dev = &client->dev;
841 int error;
842
843 guard(disable_irq)(&client->irq);
844
845 /*
846 * Wait 200usec for reset
847 */
848 udelay(200);
849
850 /* Release analog reset */
851 error = i2c_smbus_write_byte_data(client, SYSTEM,
852 ANALOG_POWER_ON | CPU_POWER_OFF);
853 if (error)
854 return error;
855
856 /* Waiting for the analog warm-up, max. 200usec */
857 udelay(200);
858
859 /* clear all interrupts */
860 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
861 if (error)
862 return error;
863
864 error = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
865 if (error)
866 return error;
867
868 error = i2c_smbus_write_byte_data(client, COMMON_SETUP1, 0);
869 if (error)
870 return error;
871
872 error = i2c_smbus_write_byte_data(client, COMMON_SETUP2, setup2);
873 if (error)
874 return error;
875
876 error = i2c_smbus_write_byte_data(client, COMMON_SETUP3,
877 SEL_TBL_DEFAULT | EN_MULTI);
878 if (error)
879 return error;
880
881 error = i2c_smbus_write_byte_data(client, THRESHOLD_GESTURE,
882 THRESHOLD_GESTURE_DEFAULT);
883 if (error)
884 return error;
885
886 error = i2c_smbus_write_byte_data(client, INTERVAL_TIME,
887 INTERVAL_TIME_DEFAULT);
888 if (error)
889 return error;
890
891 error = i2c_smbus_write_byte_data(client, CPU_FREQ, CPU_FREQ_10MHZ);
892 if (error)
893 return error;
894
895 error = i2c_smbus_write_byte_data(client, PRM_SWOFF_TIME,
896 PRM_SWOFF_TIME_DEFAULT);
897 if (error)
898 return error;
899
900 error = i2c_smbus_write_byte_data(client, ADC_CTRL, ADC_DIV_DEFAULT);
901 if (error)
902 return error;
903
904 error = i2c_smbus_write_byte_data(client, ADC_WAIT, ADC_WAIT_DEFAULT);
905 if (error)
906 return error;
907
908 /*
909 * Panel setup, these values change with the panel.
910 */
911 error = i2c_smbus_write_byte_data(client, STEP_X, STEP_X_DEFAULT);
912 if (error)
913 return error;
914
915 error = i2c_smbus_write_byte_data(client, STEP_Y, STEP_Y_DEFAULT);
916 if (error)
917 return error;
918
919 error = i2c_smbus_write_byte_data(client, OFFSET_X, OFFSET_X_DEFAULT);
920 if (error)
921 return error;
922
923 error = i2c_smbus_write_byte_data(client, OFFSET_Y, OFFSET_Y_DEFAULT);
924 if (error)
925 return error;
926
927 error = i2c_smbus_write_byte_data(client, THRESHOLD_TOUCH,
928 THRESHOLD_TOUCH_DEFAULT);
929 if (error)
930 return error;
931
932 error = i2c_smbus_write_byte_data(client, EVR_XY, EVR_XY_DEFAULT);
933 if (error)
934 return error;
935
936 error = i2c_smbus_write_byte_data(client, EVR_X, EVR_X_DEFAULT);
937 if (error)
938 return error;
939
940 error = i2c_smbus_write_byte_data(client, EVR_Y, EVR_Y_DEFAULT);
941 if (error)
942 return error;
943
944 /* Fixed value settings */
945 error = i2c_smbus_write_byte_data(client, CALIBRATION_ADJUST,
946 CALIBRATION_ADJUST_DEFAULT);
947 if (error)
948 return error;
949
950 error = i2c_smbus_write_byte_data(client, SWCONT, SWCONT_DEFAULT);
951 if (error)
952 return error;
953
954 error = i2c_smbus_write_byte_data(client, TEST1,
955 DUALTOUCH_STABILIZE_ON |
956 DUALTOUCH_REG_ON);
957 if (error)
958 return error;
959
960 error = rohm_ts_load_firmware(client, BU21023_FIRMWARE_NAME);
961 if (error) {
962 dev_err(dev, "failed to load firmware: %d\n", error);
963 return error;
964 }
965
966 /*
967 * Manual calibration results are not changed in same environment.
968 * If the force calibration is performed,
969 * the controller will not require calibration request interrupt
970 * when the typical values are set to the calibration registers.
971 */
972 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
973 CALIBRATION_REG1_DEFAULT);
974 if (error)
975 return error;
976
977 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
978 CALIBRATION_REG2_DEFAULT);
979 if (error)
980 return error;
981
982 error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
983 CALIBRATION_REG3_DEFAULT);
984 if (error)
985 return error;
986
987 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
988 FORCE_CALIBRATION_OFF);
989 if (error)
990 return error;
991
992 error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
993 FORCE_CALIBRATION_ON);
994 if (error)
995 return error;
996
997 /* Clear all interrupts */
998 error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
999 if (error)
1000 return error;
1001
1002 /* Enable coordinates update interrupt */
1003 error = i2c_smbus_write_byte_data(client, INT_MASK,
1004 CALIBRATION_DONE | SLEEP_OUT |
1005 SLEEP_IN | PROGRAM_LOAD_DONE);
1006 if (error)
1007 return error;
1008
1009 error = i2c_smbus_write_byte_data(client, ERR_MASK,
1010 PROGRAM_LOAD_ERR | CPU_TIMEOUT |
1011 ADC_TIMEOUT);
1012 if (error)
1013 return error;
1014
1015 /* controller CPU power on */
1016 error = i2c_smbus_write_byte_data(client, SYSTEM,
1017 ANALOG_POWER_ON | CPU_POWER_ON);
1018 if (error)
1019 return error;
1020
1021 return 0;
1022 }
1023
rohm_ts_power_off(struct i2c_client * client)1024 static int rohm_ts_power_off(struct i2c_client *client)
1025 {
1026 int error;
1027
1028 error = i2c_smbus_write_byte_data(client, SYSTEM,
1029 ANALOG_POWER_ON | CPU_POWER_OFF);
1030 if (error) {
1031 dev_err(&client->dev,
1032 "failed to power off device CPU: %d\n", error);
1033 return error;
1034 }
1035
1036 error = i2c_smbus_write_byte_data(client, SYSTEM,
1037 ANALOG_POWER_OFF | CPU_POWER_OFF);
1038 if (error)
1039 dev_err(&client->dev,
1040 "failed to power off the device: %d\n", error);
1041
1042 return error;
1043 }
1044
rohm_ts_open(struct input_dev * input_dev)1045 static int rohm_ts_open(struct input_dev *input_dev)
1046 {
1047 struct rohm_ts_data *ts = input_get_drvdata(input_dev);
1048 struct i2c_client *client = ts->client;
1049 int error;
1050
1051 if (!ts->initialized) {
1052 error = rohm_ts_device_init(client, ts->setup2);
1053 if (error) {
1054 dev_err(&client->dev,
1055 "device initialization failed: %d\n", error);
1056 return error;
1057 }
1058
1059 ts->initialized = true;
1060 }
1061
1062 return 0;
1063 }
1064
rohm_ts_close(struct input_dev * input_dev)1065 static void rohm_ts_close(struct input_dev *input_dev)
1066 {
1067 struct rohm_ts_data *ts = input_get_drvdata(input_dev);
1068
1069 rohm_ts_power_off(ts->client);
1070
1071 ts->initialized = false;
1072 }
1073
rohm_bu21023_i2c_probe(struct i2c_client * client)1074 static int rohm_bu21023_i2c_probe(struct i2c_client *client)
1075 {
1076 struct device *dev = &client->dev;
1077 struct rohm_ts_data *ts;
1078 struct input_dev *input;
1079 int error;
1080
1081 if (!client->irq) {
1082 dev_err(dev, "IRQ is not assigned\n");
1083 return -EINVAL;
1084 }
1085
1086 if (!client->adapter->algo->master_xfer) {
1087 dev_err(dev, "I2C level transfers not supported\n");
1088 return -EOPNOTSUPP;
1089 }
1090
1091 /* Turn off CPU just in case */
1092 error = rohm_ts_power_off(client);
1093 if (error)
1094 return error;
1095
1096 ts = devm_kzalloc(dev, sizeof(struct rohm_ts_data), GFP_KERNEL);
1097 if (!ts)
1098 return -ENOMEM;
1099
1100 ts->client = client;
1101 ts->setup2 = MAF_1SAMPLE;
1102 i2c_set_clientdata(client, ts);
1103
1104 input = devm_input_allocate_device(dev);
1105 if (!input)
1106 return -ENOMEM;
1107
1108 input->name = BU21023_NAME;
1109 input->id.bustype = BUS_I2C;
1110 input->open = rohm_ts_open;
1111 input->close = rohm_ts_close;
1112
1113 ts->input = input;
1114 input_set_drvdata(input, ts);
1115
1116 input_set_abs_params(input, ABS_MT_POSITION_X,
1117 ROHM_TS_ABS_X_MIN, ROHM_TS_ABS_X_MAX, 0, 0);
1118 input_set_abs_params(input, ABS_MT_POSITION_Y,
1119 ROHM_TS_ABS_Y_MIN, ROHM_TS_ABS_Y_MAX, 0, 0);
1120
1121 error = input_mt_init_slots(input, MAX_CONTACTS,
1122 INPUT_MT_DIRECT | INPUT_MT_TRACK |
1123 INPUT_MT_DROP_UNUSED);
1124 if (error) {
1125 dev_err(dev, "failed to multi touch slots initialization\n");
1126 return error;
1127 }
1128
1129 error = devm_request_threaded_irq(dev, client->irq,
1130 NULL, rohm_ts_soft_irq,
1131 IRQF_ONESHOT, client->name, ts);
1132 if (error) {
1133 dev_err(dev, "failed to request IRQ: %d\n", error);
1134 return error;
1135 }
1136
1137 error = input_register_device(input);
1138 if (error) {
1139 dev_err(dev, "failed to register input device: %d\n", error);
1140 return error;
1141 }
1142
1143 return error;
1144 }
1145
1146 static const struct i2c_device_id rohm_bu21023_i2c_id[] = {
1147 { BU21023_NAME },
1148 { /* sentinel */ }
1149 };
1150 MODULE_DEVICE_TABLE(i2c, rohm_bu21023_i2c_id);
1151
1152 static struct i2c_driver rohm_bu21023_i2c_driver = {
1153 .driver = {
1154 .name = BU21023_NAME,
1155 .dev_groups = rohm_ts_groups,
1156 },
1157 .probe = rohm_bu21023_i2c_probe,
1158 .id_table = rohm_bu21023_i2c_id,
1159 };
1160 module_i2c_driver(rohm_bu21023_i2c_driver);
1161
1162 MODULE_DESCRIPTION("ROHM BU21023/24 Touchscreen driver");
1163 MODULE_LICENSE("GPL v2");
1164 MODULE_AUTHOR("ROHM Co., Ltd.");
1165