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 | */ |
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(adapter: adap, I2C_LOCK_SEGMENT); |
300 | |
301 | for (i = 0; i < 2; i++) { |
302 | if (__i2c_transfer(adap, msgs: &msg[i], num: 1) < 0) { |
303 | ret = -EIO; |
304 | break; |
305 | } |
306 | } |
307 | |
308 | i2c_unlock_bus(adapter: adap, I2C_LOCK_SEGMENT); |
309 | |
310 | return ret; |
311 | } |
312 | |
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, len: 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, value: reg1); |
415 | if (error) |
416 | goto out; |
417 | |
418 | error = i2c_smbus_write_byte_data(client, |
419 | CALIBRATION_REG2, value: reg2); |
420 | if (error) |
421 | goto out; |
422 | |
423 | error = i2c_smbus_write_byte_data(client, |
424 | CALIBRATION_REG3, value: 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, value: 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 | value: reg1_orig); |
481 | if (error) |
482 | goto out; |
483 | |
484 | error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2, |
485 | value: reg2_orig); |
486 | if (error) |
487 | goto out; |
488 | |
489 | error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3, |
490 | value: 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, value: 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 | |
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, value: 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, len: 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(dev: input_dev, slots, pos, |
609 | num_pos: finger_count, ROHM_TS_DISPLACEMENT_MAX); |
610 | |
611 | for (i = 0; i < finger_count; i++) { |
612 | input_mt_slot(dev: input_dev, slot: slots[i]); |
613 | input_mt_report_slot_state(dev: input_dev, |
614 | MT_TOOL_FINGER, active: true); |
615 | input_report_abs(dev: input_dev, |
616 | ABS_MT_POSITION_X, value: pos[i].x); |
617 | input_report_abs(dev: input_dev, |
618 | ABS_MT_POSITION_Y, value: pos[i].y); |
619 | } |
620 | |
621 | input_mt_sync_frame(dev: input_dev); |
622 | input_mt_report_pointer_emulation(dev: input_dev, use_count: true); |
623 | input_sync(dev: 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 | |
642 | static int rohm_ts_load_firmware(struct i2c_client *client, |
643 | const char *firmware_name) |
644 | { |
645 | struct device *dev = &client->dev; |
646 | const struct firmware *fw; |
647 | s32 status; |
648 | unsigned int offset, len, xfer_len; |
649 | unsigned int retry = 0; |
650 | int error, error2; |
651 | |
652 | error = request_firmware(fw: &fw, name: firmware_name, device: 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, value: 0); |
671 | if (error) |
672 | goto out; |
673 | } |
674 | |
675 | error = i2c_smbus_write_byte_data(client, EX_ADDR_H, value: 0); |
676 | if (error) |
677 | goto out; |
678 | |
679 | error = i2c_smbus_write_byte_data(client, EX_ADDR_L, value: 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 | length: xfer_len, values: &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, value: 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 | release_firmware(fw); |
726 | |
727 | return error ? error : error2; |
728 | } |
729 | |
730 | static ssize_t swap_xy_show(struct device *dev, struct device_attribute *attr, |
731 | char *buf) |
732 | { |
733 | struct i2c_client *client = to_i2c_client(dev); |
734 | struct rohm_ts_data *ts = i2c_get_clientdata(client); |
735 | |
736 | return sprintf(buf, fmt: "%d\n" , !!(ts->setup2 & SWAP_XY)); |
737 | } |
738 | |
739 | static ssize_t swap_xy_store(struct device *dev, struct device_attribute *attr, |
740 | const char *buf, size_t count) |
741 | { |
742 | struct i2c_client *client = to_i2c_client(dev); |
743 | struct rohm_ts_data *ts = i2c_get_clientdata(client); |
744 | unsigned int val; |
745 | int error; |
746 | |
747 | error = kstrtouint(s: buf, base: 0, res: &val); |
748 | if (error) |
749 | return error; |
750 | |
751 | error = mutex_lock_interruptible(&ts->input->mutex); |
752 | if (error) |
753 | return error; |
754 | |
755 | if (val) |
756 | ts->setup2 |= SWAP_XY; |
757 | else |
758 | ts->setup2 &= ~SWAP_XY; |
759 | |
760 | if (ts->initialized) |
761 | error = i2c_smbus_write_byte_data(client: ts->client, COMMON_SETUP2, |
762 | value: ts->setup2); |
763 | |
764 | mutex_unlock(lock: &ts->input->mutex); |
765 | |
766 | return error ? error : count; |
767 | } |
768 | |
769 | static ssize_t inv_x_show(struct device *dev, struct device_attribute *attr, |
770 | char *buf) |
771 | { |
772 | struct i2c_client *client = to_i2c_client(dev); |
773 | struct rohm_ts_data *ts = i2c_get_clientdata(client); |
774 | |
775 | return sprintf(buf, fmt: "%d\n" , !!(ts->setup2 & INV_X)); |
776 | } |
777 | |
778 | static ssize_t inv_x_store(struct device *dev, struct device_attribute *attr, |
779 | const char *buf, size_t count) |
780 | { |
781 | struct i2c_client *client = to_i2c_client(dev); |
782 | struct rohm_ts_data *ts = i2c_get_clientdata(client); |
783 | unsigned int val; |
784 | int error; |
785 | |
786 | error = kstrtouint(s: buf, base: 0, res: &val); |
787 | if (error) |
788 | return error; |
789 | |
790 | error = mutex_lock_interruptible(&ts->input->mutex); |
791 | if (error) |
792 | return error; |
793 | |
794 | if (val) |
795 | ts->setup2 |= INV_X; |
796 | else |
797 | ts->setup2 &= ~INV_X; |
798 | |
799 | if (ts->initialized) |
800 | error = i2c_smbus_write_byte_data(client: ts->client, COMMON_SETUP2, |
801 | value: ts->setup2); |
802 | |
803 | mutex_unlock(lock: &ts->input->mutex); |
804 | |
805 | return error ? error : count; |
806 | } |
807 | |
808 | static ssize_t inv_y_show(struct device *dev, struct device_attribute *attr, |
809 | char *buf) |
810 | { |
811 | struct i2c_client *client = to_i2c_client(dev); |
812 | struct rohm_ts_data *ts = i2c_get_clientdata(client); |
813 | |
814 | return sprintf(buf, fmt: "%d\n" , !!(ts->setup2 & INV_Y)); |
815 | } |
816 | |
817 | static ssize_t inv_y_store(struct device *dev, struct device_attribute *attr, |
818 | const char *buf, size_t count) |
819 | { |
820 | struct i2c_client *client = to_i2c_client(dev); |
821 | struct rohm_ts_data *ts = i2c_get_clientdata(client); |
822 | unsigned int val; |
823 | int error; |
824 | |
825 | error = kstrtouint(s: buf, base: 0, res: &val); |
826 | if (error) |
827 | return error; |
828 | |
829 | error = mutex_lock_interruptible(&ts->input->mutex); |
830 | if (error) |
831 | return error; |
832 | |
833 | if (val) |
834 | ts->setup2 |= INV_Y; |
835 | else |
836 | ts->setup2 &= ~INV_Y; |
837 | |
838 | if (ts->initialized) |
839 | error = i2c_smbus_write_byte_data(client, COMMON_SETUP2, |
840 | value: ts->setup2); |
841 | |
842 | mutex_unlock(lock: &ts->input->mutex); |
843 | |
844 | return error ? error : count; |
845 | } |
846 | |
847 | static DEVICE_ATTR_RW(swap_xy); |
848 | static DEVICE_ATTR_RW(inv_x); |
849 | static DEVICE_ATTR_RW(inv_y); |
850 | |
851 | static struct attribute *rohm_ts_attrs[] = { |
852 | &dev_attr_swap_xy.attr, |
853 | &dev_attr_inv_x.attr, |
854 | &dev_attr_inv_y.attr, |
855 | NULL, |
856 | }; |
857 | |
858 | static const struct attribute_group rohm_ts_attr_group = { |
859 | .attrs = rohm_ts_attrs, |
860 | }; |
861 | |
862 | static int rohm_ts_device_init(struct i2c_client *client, u8 setup2) |
863 | { |
864 | struct device *dev = &client->dev; |
865 | int error; |
866 | |
867 | disable_irq(irq: client->irq); |
868 | |
869 | /* |
870 | * Wait 200usec for reset |
871 | */ |
872 | udelay(200); |
873 | |
874 | /* Release analog reset */ |
875 | error = i2c_smbus_write_byte_data(client, SYSTEM, |
876 | ANALOG_POWER_ON | CPU_POWER_OFF); |
877 | if (error) |
878 | return error; |
879 | |
880 | /* Waiting for the analog warm-up, max. 200usec */ |
881 | udelay(200); |
882 | |
883 | /* clear all interrupts */ |
884 | error = i2c_smbus_write_byte_data(client, INT_CLEAR, value: 0xff); |
885 | if (error) |
886 | return error; |
887 | |
888 | error = i2c_smbus_write_byte_data(client, EX_WDAT, value: 0); |
889 | if (error) |
890 | return error; |
891 | |
892 | error = i2c_smbus_write_byte_data(client, COMMON_SETUP1, value: 0); |
893 | if (error) |
894 | return error; |
895 | |
896 | error = i2c_smbus_write_byte_data(client, COMMON_SETUP2, value: setup2); |
897 | if (error) |
898 | return error; |
899 | |
900 | error = i2c_smbus_write_byte_data(client, COMMON_SETUP3, |
901 | SEL_TBL_DEFAULT | EN_MULTI); |
902 | if (error) |
903 | return error; |
904 | |
905 | error = i2c_smbus_write_byte_data(client, THRESHOLD_GESTURE, |
906 | THRESHOLD_GESTURE_DEFAULT); |
907 | if (error) |
908 | return error; |
909 | |
910 | error = i2c_smbus_write_byte_data(client, INTERVAL_TIME, |
911 | INTERVAL_TIME_DEFAULT); |
912 | if (error) |
913 | return error; |
914 | |
915 | error = i2c_smbus_write_byte_data(client, CPU_FREQ, CPU_FREQ_10MHZ); |
916 | if (error) |
917 | return error; |
918 | |
919 | error = i2c_smbus_write_byte_data(client, PRM_SWOFF_TIME, |
920 | PRM_SWOFF_TIME_DEFAULT); |
921 | if (error) |
922 | return error; |
923 | |
924 | error = i2c_smbus_write_byte_data(client, ADC_CTRL, ADC_DIV_DEFAULT); |
925 | if (error) |
926 | return error; |
927 | |
928 | error = i2c_smbus_write_byte_data(client, ADC_WAIT, ADC_WAIT_DEFAULT); |
929 | if (error) |
930 | return error; |
931 | |
932 | /* |
933 | * Panel setup, these values change with the panel. |
934 | */ |
935 | error = i2c_smbus_write_byte_data(client, STEP_X, STEP_X_DEFAULT); |
936 | if (error) |
937 | return error; |
938 | |
939 | error = i2c_smbus_write_byte_data(client, STEP_Y, STEP_Y_DEFAULT); |
940 | if (error) |
941 | return error; |
942 | |
943 | error = i2c_smbus_write_byte_data(client, OFFSET_X, OFFSET_X_DEFAULT); |
944 | if (error) |
945 | return error; |
946 | |
947 | error = i2c_smbus_write_byte_data(client, OFFSET_Y, OFFSET_Y_DEFAULT); |
948 | if (error) |
949 | return error; |
950 | |
951 | error = i2c_smbus_write_byte_data(client, THRESHOLD_TOUCH, |
952 | THRESHOLD_TOUCH_DEFAULT); |
953 | if (error) |
954 | return error; |
955 | |
956 | error = i2c_smbus_write_byte_data(client, EVR_XY, EVR_XY_DEFAULT); |
957 | if (error) |
958 | return error; |
959 | |
960 | error = i2c_smbus_write_byte_data(client, EVR_X, EVR_X_DEFAULT); |
961 | if (error) |
962 | return error; |
963 | |
964 | error = i2c_smbus_write_byte_data(client, EVR_Y, EVR_Y_DEFAULT); |
965 | if (error) |
966 | return error; |
967 | |
968 | /* Fixed value settings */ |
969 | error = i2c_smbus_write_byte_data(client, CALIBRATION_ADJUST, |
970 | CALIBRATION_ADJUST_DEFAULT); |
971 | if (error) |
972 | return error; |
973 | |
974 | error = i2c_smbus_write_byte_data(client, SWCONT, SWCONT_DEFAULT); |
975 | if (error) |
976 | return error; |
977 | |
978 | error = i2c_smbus_write_byte_data(client, TEST1, |
979 | DUALTOUCH_STABILIZE_ON | |
980 | DUALTOUCH_REG_ON); |
981 | if (error) |
982 | return error; |
983 | |
984 | error = rohm_ts_load_firmware(client, BU21023_FIRMWARE_NAME); |
985 | if (error) { |
986 | dev_err(dev, "failed to load firmware: %d\n" , error); |
987 | return error; |
988 | } |
989 | |
990 | /* |
991 | * Manual calibration results are not changed in same environment. |
992 | * If the force calibration is performed, |
993 | * the controller will not require calibration request interrupt |
994 | * when the typical values are set to the calibration registers. |
995 | */ |
996 | error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1, |
997 | CALIBRATION_REG1_DEFAULT); |
998 | if (error) |
999 | return error; |
1000 | |
1001 | error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2, |
1002 | CALIBRATION_REG2_DEFAULT); |
1003 | if (error) |
1004 | return error; |
1005 | |
1006 | error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3, |
1007 | CALIBRATION_REG3_DEFAULT); |
1008 | if (error) |
1009 | return error; |
1010 | |
1011 | error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION, |
1012 | FORCE_CALIBRATION_OFF); |
1013 | if (error) |
1014 | return error; |
1015 | |
1016 | error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION, |
1017 | FORCE_CALIBRATION_ON); |
1018 | if (error) |
1019 | return error; |
1020 | |
1021 | /* Clear all interrupts */ |
1022 | error = i2c_smbus_write_byte_data(client, INT_CLEAR, value: 0xff); |
1023 | if (error) |
1024 | return error; |
1025 | |
1026 | /* Enable coordinates update interrupt */ |
1027 | error = i2c_smbus_write_byte_data(client, INT_MASK, |
1028 | CALIBRATION_DONE | SLEEP_OUT | |
1029 | SLEEP_IN | PROGRAM_LOAD_DONE); |
1030 | if (error) |
1031 | return error; |
1032 | |
1033 | error = i2c_smbus_write_byte_data(client, ERR_MASK, |
1034 | PROGRAM_LOAD_ERR | CPU_TIMEOUT | |
1035 | ADC_TIMEOUT); |
1036 | if (error) |
1037 | return error; |
1038 | |
1039 | /* controller CPU power on */ |
1040 | error = i2c_smbus_write_byte_data(client, SYSTEM, |
1041 | ANALOG_POWER_ON | CPU_POWER_ON); |
1042 | |
1043 | enable_irq(irq: client->irq); |
1044 | |
1045 | return error; |
1046 | } |
1047 | |
1048 | static int rohm_ts_power_off(struct i2c_client *client) |
1049 | { |
1050 | int error; |
1051 | |
1052 | error = i2c_smbus_write_byte_data(client, SYSTEM, |
1053 | ANALOG_POWER_ON | CPU_POWER_OFF); |
1054 | if (error) { |
1055 | dev_err(&client->dev, |
1056 | "failed to power off device CPU: %d\n" , error); |
1057 | return error; |
1058 | } |
1059 | |
1060 | error = i2c_smbus_write_byte_data(client, SYSTEM, |
1061 | ANALOG_POWER_OFF | CPU_POWER_OFF); |
1062 | if (error) |
1063 | dev_err(&client->dev, |
1064 | "failed to power off the device: %d\n" , error); |
1065 | |
1066 | return error; |
1067 | } |
1068 | |
1069 | static int rohm_ts_open(struct input_dev *input_dev) |
1070 | { |
1071 | struct rohm_ts_data *ts = input_get_drvdata(dev: input_dev); |
1072 | struct i2c_client *client = ts->client; |
1073 | int error; |
1074 | |
1075 | if (!ts->initialized) { |
1076 | error = rohm_ts_device_init(client, setup2: ts->setup2); |
1077 | if (error) { |
1078 | dev_err(&client->dev, |
1079 | "device initialization failed: %d\n" , error); |
1080 | return error; |
1081 | } |
1082 | |
1083 | ts->initialized = true; |
1084 | } |
1085 | |
1086 | return 0; |
1087 | } |
1088 | |
1089 | static void rohm_ts_close(struct input_dev *input_dev) |
1090 | { |
1091 | struct rohm_ts_data *ts = input_get_drvdata(dev: input_dev); |
1092 | |
1093 | rohm_ts_power_off(client: ts->client); |
1094 | |
1095 | ts->initialized = false; |
1096 | } |
1097 | |
1098 | static int rohm_bu21023_i2c_probe(struct i2c_client *client) |
1099 | { |
1100 | struct device *dev = &client->dev; |
1101 | struct rohm_ts_data *ts; |
1102 | struct input_dev *input; |
1103 | int error; |
1104 | |
1105 | if (!client->irq) { |
1106 | dev_err(dev, "IRQ is not assigned\n" ); |
1107 | return -EINVAL; |
1108 | } |
1109 | |
1110 | if (!client->adapter->algo->master_xfer) { |
1111 | dev_err(dev, "I2C level transfers not supported\n" ); |
1112 | return -EOPNOTSUPP; |
1113 | } |
1114 | |
1115 | /* Turn off CPU just in case */ |
1116 | error = rohm_ts_power_off(client); |
1117 | if (error) |
1118 | return error; |
1119 | |
1120 | ts = devm_kzalloc(dev, size: sizeof(struct rohm_ts_data), GFP_KERNEL); |
1121 | if (!ts) |
1122 | return -ENOMEM; |
1123 | |
1124 | ts->client = client; |
1125 | ts->setup2 = MAF_1SAMPLE; |
1126 | i2c_set_clientdata(client, data: ts); |
1127 | |
1128 | input = devm_input_allocate_device(dev); |
1129 | if (!input) |
1130 | return -ENOMEM; |
1131 | |
1132 | input->name = BU21023_NAME; |
1133 | input->id.bustype = BUS_I2C; |
1134 | input->open = rohm_ts_open; |
1135 | input->close = rohm_ts_close; |
1136 | |
1137 | ts->input = input; |
1138 | input_set_drvdata(dev: input, data: ts); |
1139 | |
1140 | input_set_abs_params(dev: input, ABS_MT_POSITION_X, |
1141 | ROHM_TS_ABS_X_MIN, ROHM_TS_ABS_X_MAX, fuzz: 0, flat: 0); |
1142 | input_set_abs_params(dev: input, ABS_MT_POSITION_Y, |
1143 | ROHM_TS_ABS_Y_MIN, ROHM_TS_ABS_Y_MAX, fuzz: 0, flat: 0); |
1144 | |
1145 | error = input_mt_init_slots(dev: input, MAX_CONTACTS, |
1146 | INPUT_MT_DIRECT | INPUT_MT_TRACK | |
1147 | INPUT_MT_DROP_UNUSED); |
1148 | if (error) { |
1149 | dev_err(dev, "failed to multi touch slots initialization\n" ); |
1150 | return error; |
1151 | } |
1152 | |
1153 | error = devm_request_threaded_irq(dev, irq: client->irq, |
1154 | NULL, thread_fn: rohm_ts_soft_irq, |
1155 | IRQF_ONESHOT, devname: client->name, dev_id: ts); |
1156 | if (error) { |
1157 | dev_err(dev, "failed to request IRQ: %d\n" , error); |
1158 | return error; |
1159 | } |
1160 | |
1161 | error = input_register_device(input); |
1162 | if (error) { |
1163 | dev_err(dev, "failed to register input device: %d\n" , error); |
1164 | return error; |
1165 | } |
1166 | |
1167 | error = devm_device_add_group(dev, grp: &rohm_ts_attr_group); |
1168 | if (error) { |
1169 | dev_err(dev, "failed to create sysfs group: %d\n" , error); |
1170 | return error; |
1171 | } |
1172 | |
1173 | return error; |
1174 | } |
1175 | |
1176 | static const struct i2c_device_id rohm_bu21023_i2c_id[] = { |
1177 | { BU21023_NAME, 0 }, |
1178 | { /* sentinel */ } |
1179 | }; |
1180 | MODULE_DEVICE_TABLE(i2c, rohm_bu21023_i2c_id); |
1181 | |
1182 | static struct i2c_driver rohm_bu21023_i2c_driver = { |
1183 | .driver = { |
1184 | .name = BU21023_NAME, |
1185 | }, |
1186 | .probe = rohm_bu21023_i2c_probe, |
1187 | .id_table = rohm_bu21023_i2c_id, |
1188 | }; |
1189 | module_i2c_driver(rohm_bu21023_i2c_driver); |
1190 | |
1191 | MODULE_DESCRIPTION("ROHM BU21023/24 Touchscreen driver" ); |
1192 | MODULE_LICENSE("GPL v2" ); |
1193 | MODULE_AUTHOR("ROHM Co., Ltd." ); |
1194 | |