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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / input / touchscreen / edt-ft5x06.c
blob2eefbc2485bc975ff695ded1244ca1126e5279c6
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
4 * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
5 * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
6 */
7
8 /*
9 * This is a driver for the EDT "Polytouch" family of touch controllers
10 * based on the FocalTech FT5x06 line of chips.
11 *
12 * Development of this driver has been sponsored by Glyn:
13 * http://www.glyn.com/Products/Displays
14 */
15
16 #include <linux/debugfs.h>
17 #include <linux/delay.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/i2c.h>
20 #include <linux/interrupt.h>
21 #include <linux/input.h>
22 #include <linux/input/mt.h>
23 #include <linux/input/touchscreen.h>
24 #include <linux/irq.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/ratelimit.h>
28 #include <linux/regulator/consumer.h>
29 #include <linux/slab.h>
30 #include <linux/uaccess.h>
31
32 #include <asm/unaligned.h>
33
34 #define WORK_REGISTER_THRESHOLD 0x00
35 #define WORK_REGISTER_REPORT_RATE 0x08
36 #define WORK_REGISTER_GAIN 0x30
37 #define WORK_REGISTER_OFFSET 0x31
38 #define WORK_REGISTER_NUM_X 0x33
39 #define WORK_REGISTER_NUM_Y 0x34
40
41 #define PMOD_REGISTER_ACTIVE 0x00
42 #define PMOD_REGISTER_HIBERNATE 0x03
43
44 #define M09_REGISTER_THRESHOLD 0x80
45 #define M09_REGISTER_GAIN 0x92
46 #define M09_REGISTER_OFFSET 0x93
47 #define M09_REGISTER_NUM_X 0x94
48 #define M09_REGISTER_NUM_Y 0x95
49
50 #define EV_REGISTER_THRESHOLD 0x40
51 #define EV_REGISTER_GAIN 0x41
52 #define EV_REGISTER_OFFSET_Y 0x45
53 #define EV_REGISTER_OFFSET_X 0x46
54
55 #define NO_REGISTER 0xff
56
57 #define WORK_REGISTER_OPMODE 0x3c
58 #define FACTORY_REGISTER_OPMODE 0x01
59 #define PMOD_REGISTER_OPMODE 0xa5
60
61 #define TOUCH_EVENT_DOWN 0x00
62 #define TOUCH_EVENT_UP 0x01
63 #define TOUCH_EVENT_ON 0x02
64 #define TOUCH_EVENT_RESERVED 0x03
65
66 #define EDT_NAME_LEN 23
67 #define EDT_SWITCH_MODE_RETRIES 10
68 #define EDT_SWITCH_MODE_DELAY 5 /* msec */
69 #define EDT_RAW_DATA_RETRIES 100
70 #define EDT_RAW_DATA_DELAY 1000 /* usec */
71
72 #define EDT_DEFAULT_NUM_X 1024
73 #define EDT_DEFAULT_NUM_Y 1024
74
75 enum edt_pmode {
76 EDT_PMODE_NOT_SUPPORTED,
77 EDT_PMODE_HIBERNATE,
78 EDT_PMODE_POWEROFF,
79 };
80
81 enum edt_ver {
82 EDT_M06,
83 EDT_M09,
84 EDT_M12,
85 EV_FT,
86 GENERIC_FT,
87 };
88
89 struct edt_reg_addr {
90 int reg_threshold;
91 int reg_report_rate;
92 int reg_gain;
93 int reg_offset;
94 int reg_offset_x;
95 int reg_offset_y;
96 int reg_num_x;
97 int reg_num_y;
98 };
99
100 struct edt_ft5x06_ts_data {
101 struct i2c_client *client;
102 struct input_dev *input;
103 struct touchscreen_properties prop;
104 u16 num_x;
105 u16 num_y;
106 struct regulator *vcc;
107
108 struct gpio_desc *reset_gpio;
109 struct gpio_desc *wake_gpio;
110
111 #if defined(CONFIG_DEBUG_FS)
112 struct dentry *debug_dir;
113 u8 *raw_buffer;
114 size_t raw_bufsize;
115 #endif
116
117 struct mutex mutex;
118 bool factory_mode;
119 enum edt_pmode suspend_mode;
120 int threshold;
121 int gain;
122 int offset;
123 int offset_x;
124 int offset_y;
125 int report_rate;
126 int max_support_points;
127
128 char name[EDT_NAME_LEN];
129
130 struct edt_reg_addr reg_addr;
131 enum edt_ver version;
132 };
133
134 struct edt_i2c_chip_data {
135 int max_support_points;
136 };
137
138 static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
139 u16 wr_len, u8 *wr_buf,
140 u16 rd_len, u8 *rd_buf)
141 {
142 struct i2c_msg wrmsg[2];
143 int i = 0;
144 int ret;
145
146 if (wr_len) {
147 wrmsg[i].addr = client->addr;
148 wrmsg[i].flags = 0;
149 wrmsg[i].len = wr_len;
150 wrmsg[i].buf = wr_buf;
151 i++;
152 }
153 if (rd_len) {
154 wrmsg[i].addr = client->addr;
155 wrmsg[i].flags = I2C_M_RD;
156 wrmsg[i].len = rd_len;
157 wrmsg[i].buf = rd_buf;
158 i++;
159 }
160
161 ret = i2c_transfer(client->adapter, wrmsg, i);
162 if (ret < 0)
163 return ret;
164 if (ret != i)
165 return -EIO;
166
167 return 0;
168 }
169
170 static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
171 u8 *buf, int buflen)
172 {
173 int i;
174 u8 crc = 0;
175
176 for (i = 0; i < buflen - 1; i++)
177 crc ^= buf[i];
178
179 if (crc != buf[buflen-1]) {
180 dev_err_ratelimited(&tsdata->client->dev,
181 "crc error: 0x%02x expected, got 0x%02x\n",
182 crc, buf[buflen-1]);
183 return false;
184 }
185
186 return true;
187 }
188
189 static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
190 {
191 struct edt_ft5x06_ts_data *tsdata = dev_id;
192 struct device *dev = &tsdata->client->dev;
193 u8 cmd;
194 u8 rdbuf[63];
195 int i, type, x, y, id;
196 int offset, tplen, datalen, crclen;
197 int error;
198
199 switch (tsdata->version) {
200 case EDT_M06:
201 cmd = 0xf9; /* tell the controller to send touch data */
202 offset = 5; /* where the actual touch data starts */
203 tplen = 4; /* data comes in so called frames */
204 crclen = 1; /* length of the crc data */
205 break;
206
207 case EDT_M09:
208 case EDT_M12:
209 case EV_FT:
210 case GENERIC_FT:
211 cmd = 0x0;
212 offset = 3;
213 tplen = 6;
214 crclen = 0;
215 break;
216
217 default:
218 goto out;
219 }
220
221 memset(rdbuf, 0, sizeof(rdbuf));
222 datalen = tplen * tsdata->max_support_points + offset + crclen;
223
224 error = edt_ft5x06_ts_readwrite(tsdata->client,
225 sizeof(cmd), &cmd,
226 datalen, rdbuf);
227 if (error) {
228 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
229 error);
230 goto out;
231 }
232
233 /* M09/M12 does not send header or CRC */
234 if (tsdata->version == EDT_M06) {
235 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
236 rdbuf[2] != datalen) {
237 dev_err_ratelimited(dev,
238 "Unexpected header: %02x%02x%02x!\n",
239 rdbuf[0], rdbuf[1], rdbuf[2]);
240 goto out;
241 }
242
243 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
244 goto out;
245 }
246
247 for (i = 0; i < tsdata->max_support_points; i++) {
248 u8 *buf = &rdbuf[i * tplen + offset];
249
250 type = buf[0] >> 6;
251 /* ignore Reserved events */
252 if (type == TOUCH_EVENT_RESERVED)
253 continue;
254
255 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
256 if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
257 continue;
258
259 x = get_unaligned_be16(buf) & 0x0fff;
260 y = get_unaligned_be16(buf + 2) & 0x0fff;
261 /* The FT5x26 send the y coordinate first */
262 if (tsdata->version == EV_FT)
263 swap(x, y);
264
265 id = (buf[2] >> 4) & 0x0f;
266
267 input_mt_slot(tsdata->input, id);
268 if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
269 type != TOUCH_EVENT_UP))
270 touchscreen_report_pos(tsdata->input, &tsdata->prop,
271 x, y, true);
272 }
273
274 input_mt_report_pointer_emulation(tsdata->input, true);
275 input_sync(tsdata->input);
276
277 out:
278 return IRQ_HANDLED;
279 }
280
281 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
282 u8 addr, u8 value)
283 {
284 u8 wrbuf[4];
285
286 switch (tsdata->version) {
287 case EDT_M06:
288 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
289 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
290 wrbuf[2] = value;
291 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
292 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
293 wrbuf, 0, NULL);
294
295 case EDT_M09:
296 case EDT_M12:
297 case EV_FT:
298 case GENERIC_FT:
299 wrbuf[0] = addr;
300 wrbuf[1] = value;
301
302 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
303 wrbuf, 0, NULL);
304
305 default:
306 return -EINVAL;
307 }
308 }
309
310 static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
311 u8 addr)
312 {
313 u8 wrbuf[2], rdbuf[2];
314 int error;
315
316 switch (tsdata->version) {
317 case EDT_M06:
318 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
319 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
320 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
321
322 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
323 rdbuf);
324 if (error)
325 return error;
326
327 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
328 dev_err(&tsdata->client->dev,
329 "crc error: 0x%02x expected, got 0x%02x\n",
330 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
331 rdbuf[1]);
332 return -EIO;
333 }
334 break;
335
336 case EDT_M09:
337 case EDT_M12:
338 case EV_FT:
339 case GENERIC_FT:
340 wrbuf[0] = addr;
341 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
342 wrbuf, 1, rdbuf);
343 if (error)
344 return error;
345 break;
346
347 default:
348 return -EINVAL;
349 }
350
351 return rdbuf[0];
352 }
353
354 struct edt_ft5x06_attribute {
355 struct device_attribute dattr;
356 size_t field_offset;
357 u8 limit_low;
358 u8 limit_high;
359 u8 addr_m06;
360 u8 addr_m09;
361 u8 addr_ev;
362 };
363
364 #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev, \
365 _limit_low, _limit_high) \
366 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
367 .dattr = __ATTR(_field, _mode, \
368 edt_ft5x06_setting_show, \
369 edt_ft5x06_setting_store), \
370 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
371 .addr_m06 = _addr_m06, \
372 .addr_m09 = _addr_m09, \
373 .addr_ev = _addr_ev, \
374 .limit_low = _limit_low, \
375 .limit_high = _limit_high, \
376 }
377
378 static ssize_t edt_ft5x06_setting_show(struct device *dev,
379 struct device_attribute *dattr,
380 char *buf)
381 {
382 struct i2c_client *client = to_i2c_client(dev);
383 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
384 struct edt_ft5x06_attribute *attr =
385 container_of(dattr, struct edt_ft5x06_attribute, dattr);
386 u8 *field = (u8 *)tsdata + attr->field_offset;
387 int val;
388 size_t count = 0;
389 int error = 0;
390 u8 addr;
391
392 mutex_lock(&tsdata->mutex);
393
394 if (tsdata->factory_mode) {
395 error = -EIO;
396 goto out;
397 }
398
399 switch (tsdata->version) {
400 case EDT_M06:
401 addr = attr->addr_m06;
402 break;
403
404 case EDT_M09:
405 case EDT_M12:
406 case GENERIC_FT:
407 addr = attr->addr_m09;
408 break;
409
410 case EV_FT:
411 addr = attr->addr_ev;
412 break;
413
414 default:
415 error = -ENODEV;
416 goto out;
417 }
418
419 if (addr != NO_REGISTER) {
420 val = edt_ft5x06_register_read(tsdata, addr);
421 if (val < 0) {
422 error = val;
423 dev_err(&tsdata->client->dev,
424 "Failed to fetch attribute %s, error %d\n",
425 dattr->attr.name, error);
426 goto out;
427 }
428 } else {
429 val = *field;
430 }
431
432 if (val != *field) {
433 dev_warn(&tsdata->client->dev,
434 "%s: read (%d) and stored value (%d) differ\n",
435 dattr->attr.name, val, *field);
436 *field = val;
437 }
438
439 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
440 out:
441 mutex_unlock(&tsdata->mutex);
442 return error ?: count;
443 }
444
445 static ssize_t edt_ft5x06_setting_store(struct device *dev,
446 struct device_attribute *dattr,
447 const char *buf, size_t count)
448 {
449 struct i2c_client *client = to_i2c_client(dev);
450 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
451 struct edt_ft5x06_attribute *attr =
452 container_of(dattr, struct edt_ft5x06_attribute, dattr);
453 u8 *field = (u8 *)tsdata + attr->field_offset;
454 unsigned int val;
455 int error;
456 u8 addr;
457
458 mutex_lock(&tsdata->mutex);
459
460 if (tsdata->factory_mode) {
461 error = -EIO;
462 goto out;
463 }
464
465 error = kstrtouint(buf, 0, &val);
466 if (error)
467 goto out;
468
469 if (val < attr->limit_low || val > attr->limit_high) {
470 error = -ERANGE;
471 goto out;
472 }
473
474 switch (tsdata->version) {
475 case EDT_M06:
476 addr = attr->addr_m06;
477 break;
478
479 case EDT_M09:
480 case EDT_M12:
481 case GENERIC_FT:
482 addr = attr->addr_m09;
483 break;
484
485 case EV_FT:
486 addr = attr->addr_ev;
487 break;
488
489 default:
490 error = -ENODEV;
491 goto out;
492 }
493
494 if (addr != NO_REGISTER) {
495 error = edt_ft5x06_register_write(tsdata, addr, val);
496 if (error) {
497 dev_err(&tsdata->client->dev,
498 "Failed to update attribute %s, error: %d\n",
499 dattr->attr.name, error);
500 goto out;
501 }
502 }
503 *field = val;
504
505 out:
506 mutex_unlock(&tsdata->mutex);
507 return error ?: count;
508 }
509
510 /* m06, m09: range 0-31, m12: range 0-5 */
511 static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
512 M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31);
513 /* m06, m09: range 0-31, m12: range 0-16 */
514 static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
515 M09_REGISTER_OFFSET, NO_REGISTER, 0, 31);
516 /* m06, m09, m12: no supported, ev_ft: range 0-80 */
517 static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
518 EV_REGISTER_OFFSET_X, 0, 80);
519 /* m06, m09, m12: no supported, ev_ft: range 0-80 */
520 static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
521 EV_REGISTER_OFFSET_Y, 0, 80);
522 /* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */
523 static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
524 M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255);
525 /* m06: range 3 to 14, m12: (0x64: 100Hz) */
526 static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
527 NO_REGISTER, NO_REGISTER, 0, 255);
528
529 static struct attribute *edt_ft5x06_attrs[] = {
530 &edt_ft5x06_attr_gain.dattr.attr,
531 &edt_ft5x06_attr_offset.dattr.attr,
532 &edt_ft5x06_attr_offset_x.dattr.attr,
533 &edt_ft5x06_attr_offset_y.dattr.attr,
534 &edt_ft5x06_attr_threshold.dattr.attr,
535 &edt_ft5x06_attr_report_rate.dattr.attr,
536 NULL
537 };
538
539 static const struct attribute_group edt_ft5x06_attr_group = {
540 .attrs = edt_ft5x06_attrs,
541 };
542
543 static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata)
544 {
545 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
546
547 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
548 tsdata->threshold);
549 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
550 tsdata->gain);
551 if (reg_addr->reg_offset != NO_REGISTER)
552 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
553 tsdata->offset);
554 if (reg_addr->reg_offset_x != NO_REGISTER)
555 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x,
556 tsdata->offset_x);
557 if (reg_addr->reg_offset_y != NO_REGISTER)
558 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y,
559 tsdata->offset_y);
560 if (reg_addr->reg_report_rate != NO_REGISTER)
561 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
562 tsdata->report_rate);
563
564 }
565
566 #ifdef CONFIG_DEBUG_FS
567 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
568 {
569 struct i2c_client *client = tsdata->client;
570 int retries = EDT_SWITCH_MODE_RETRIES;
571 int ret;
572 int error;
573
574 if (tsdata->version != EDT_M06) {
575 dev_err(&client->dev,
576 "No factory mode support for non-M06 devices\n");
577 return -EINVAL;
578 }
579
580 disable_irq(client->irq);
581
582 if (!tsdata->raw_buffer) {
583 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
584 sizeof(u16);
585 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
586 if (!tsdata->raw_buffer) {
587 error = -ENOMEM;
588 goto err_out;
589 }
590 }
591
592 /* mode register is 0x3c when in the work mode */
593 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
594 if (error) {
595 dev_err(&client->dev,
596 "failed to switch to factory mode, error %d\n", error);
597 goto err_out;
598 }
599
600 tsdata->factory_mode = true;
601 do {
602 mdelay(EDT_SWITCH_MODE_DELAY);
603 /* mode register is 0x01 when in factory mode */
604 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
605 if (ret == 0x03)
606 break;
607 } while (--retries > 0);
608
609 if (retries == 0) {
610 dev_err(&client->dev, "not in factory mode after %dms.\n",
611 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
612 error = -EIO;
613 goto err_out;
614 }
615
616 return 0;
617
618 err_out:
619 kfree(tsdata->raw_buffer);
620 tsdata->raw_buffer = NULL;
621 tsdata->factory_mode = false;
622 enable_irq(client->irq);
623
624 return error;
625 }
626
627 static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
628 {
629 struct i2c_client *client = tsdata->client;
630 int retries = EDT_SWITCH_MODE_RETRIES;
631 int ret;
632 int error;
633
634 /* mode register is 0x01 when in the factory mode */
635 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
636 if (error) {
637 dev_err(&client->dev,
638 "failed to switch to work mode, error: %d\n", error);
639 return error;
640 }
641
642 tsdata->factory_mode = false;
643
644 do {
645 mdelay(EDT_SWITCH_MODE_DELAY);
646 /* mode register is 0x01 when in factory mode */
647 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
648 if (ret == 0x01)
649 break;
650 } while (--retries > 0);
651
652 if (retries == 0) {
653 dev_err(&client->dev, "not in work mode after %dms.\n",
654 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
655 tsdata->factory_mode = true;
656 return -EIO;
657 }
658
659 kfree(tsdata->raw_buffer);
660 tsdata->raw_buffer = NULL;
661
662 edt_ft5x06_restore_reg_parameters(tsdata);
663 enable_irq(client->irq);
664
665 return 0;
666 }
667
668 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
669 {
670 struct edt_ft5x06_ts_data *tsdata = data;
671
672 *mode = tsdata->factory_mode;
673
674 return 0;
675 };
676
677 static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
678 {
679 struct edt_ft5x06_ts_data *tsdata = data;
680 int retval = 0;
681
682 if (mode > 1)
683 return -ERANGE;
684
685 mutex_lock(&tsdata->mutex);
686
687 if (mode != tsdata->factory_mode) {
688 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
689 edt_ft5x06_work_mode(tsdata);
690 }
691
692 mutex_unlock(&tsdata->mutex);
693
694 return retval;
695 };
696
697 DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
698 edt_ft5x06_debugfs_mode_set, "%llu\n");
699
700 static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
701 char __user *buf, size_t count, loff_t *off)
702 {
703 struct edt_ft5x06_ts_data *tsdata = file->private_data;
704 struct i2c_client *client = tsdata->client;
705 int retries = EDT_RAW_DATA_RETRIES;
706 int val, i, error;
707 size_t read = 0;
708 int colbytes;
709 char wrbuf[3];
710 u8 *rdbuf;
711
712 if (*off < 0 || *off >= tsdata->raw_bufsize)
713 return 0;
714
715 mutex_lock(&tsdata->mutex);
716
717 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
718 error = -EIO;
719 goto out;
720 }
721
722 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
723 if (error) {
724 dev_dbg(&client->dev,
725 "failed to write 0x08 register, error %d\n", error);
726 goto out;
727 }
728
729 do {
730 usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
731 val = edt_ft5x06_register_read(tsdata, 0x08);
732 if (val < 1)
733 break;
734 } while (--retries > 0);
735
736 if (val < 0) {
737 error = val;
738 dev_dbg(&client->dev,
739 "failed to read 0x08 register, error %d\n", error);
740 goto out;
741 }
742
743 if (retries == 0) {
744 dev_dbg(&client->dev,
745 "timed out waiting for register to settle\n");
746 error = -ETIMEDOUT;
747 goto out;
748 }
749
750 rdbuf = tsdata->raw_buffer;
751 colbytes = tsdata->num_y * sizeof(u16);
752
753 wrbuf[0] = 0xf5;
754 wrbuf[1] = 0x0e;
755 for (i = 0; i < tsdata->num_x; i++) {
756 wrbuf[2] = i; /* column index */
757 error = edt_ft5x06_ts_readwrite(tsdata->client,
758 sizeof(wrbuf), wrbuf,
759 colbytes, rdbuf);
760 if (error)
761 goto out;
762
763 rdbuf += colbytes;
764 }
765
766 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
767 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
768 error = -EFAULT;
769 goto out;
770 }
771
772 *off += read;
773 out:
774 mutex_unlock(&tsdata->mutex);
775 return error ?: read;
776 };
777
778 static const struct file_operations debugfs_raw_data_fops = {
779 .open = simple_open,
780 .read = edt_ft5x06_debugfs_raw_data_read,
781 };
782
783 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
784 const char *debugfs_name)
785 {
786 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
787
788 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
789 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
790
791 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
792 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
793 debugfs_create_file("raw_data", S_IRUSR,
794 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
795 }
796
797 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
798 {
799 debugfs_remove_recursive(tsdata->debug_dir);
800 kfree(tsdata->raw_buffer);
801 }
802
803 #else
804
805 static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
806 {
807 return -ENOSYS;
808 }
809
810 static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
811 const char *debugfs_name)
812 {
813 }
814
815 static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
816 {
817 }
818
819 #endif /* CONFIG_DEBUGFS */
820
821 static int edt_ft5x06_ts_identify(struct i2c_client *client,
822 struct edt_ft5x06_ts_data *tsdata,
823 char *fw_version)
824 {
825 u8 rdbuf[EDT_NAME_LEN];
826 char *p;
827 int error;
828 char *model_name = tsdata->name;
829
830 /* see what we find if we assume it is a M06 *
831 * if we get less than EDT_NAME_LEN, we don't want
832 * to have garbage in there
833 */
834 memset(rdbuf, 0, sizeof(rdbuf));
835 error = edt_ft5x06_ts_readwrite(client, 1, "\xBB",
836 EDT_NAME_LEN - 1, rdbuf);
837 if (error)
838 return error;
839
840 /* Probe content for something consistent.
841 * M06 starts with a response byte, M12 gives the data directly.
842 * M09/Generic does not provide model number information.
843 */
844 if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
845 tsdata->version = EDT_M06;
846
847 /* remove last '$' end marker */
848 rdbuf[EDT_NAME_LEN - 1] = '\0';
849 if (rdbuf[EDT_NAME_LEN - 2] == '$')
850 rdbuf[EDT_NAME_LEN - 2] = '\0';
851
852 /* look for Model/Version separator */
853 p = strchr(rdbuf, '*');
854 if (p)
855 *p++ = '\0';
856 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
857 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
858 } else if (!strncasecmp(rdbuf, "EP0", 3)) {
859 tsdata->version = EDT_M12;
860
861 /* remove last '$' end marker */
862 rdbuf[EDT_NAME_LEN - 2] = '\0';
863 if (rdbuf[EDT_NAME_LEN - 3] == '$')
864 rdbuf[EDT_NAME_LEN - 3] = '\0';
865
866 /* look for Model/Version separator */
867 p = strchr(rdbuf, '*');
868 if (p)
869 *p++ = '\0';
870 strlcpy(model_name, rdbuf, EDT_NAME_LEN);
871 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
872 } else {
873 /* If it is not an EDT M06/M12 touchscreen, then the model
874 * detection is a bit hairy. The different ft5x06
875 * firmares around don't reliably implement the
876 * identification registers. Well, we'll take a shot.
877 *
878 * The main difference between generic focaltec based
879 * touches and EDT M09 is that we know how to retrieve
880 * the max coordinates for the latter.
881 */
882 tsdata->version = GENERIC_FT;
883
884 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
885 2, rdbuf);
886 if (error)
887 return error;
888
889 strlcpy(fw_version, rdbuf, 2);
890
891 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
892 1, rdbuf);
893 if (error)
894 return error;
895
896 /* This "model identification" is not exact. Unfortunately
897 * not all firmwares for the ft5x06 put useful values in
898 * the identification registers.
899 */
900 switch (rdbuf[0]) {
901 case 0x35: /* EDT EP0350M09 */
902 case 0x43: /* EDT EP0430M09 */
903 case 0x50: /* EDT EP0500M09 */
904 case 0x57: /* EDT EP0570M09 */
905 case 0x70: /* EDT EP0700M09 */
906 tsdata->version = EDT_M09;
907 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
908 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
909 break;
910 case 0xa1: /* EDT EP1010ML00 */
911 tsdata->version = EDT_M09;
912 snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00",
913 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
914 break;
915 case 0x5a: /* Solomon Goldentek Display */
916 snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0");
917 break;
918 case 0x59: /* Evervision Display with FT5xx6 TS */
919 tsdata->version = EV_FT;
920 error = edt_ft5x06_ts_readwrite(client, 1, "\x53",
921 1, rdbuf);
922 if (error)
923 return error;
924 strlcpy(fw_version, rdbuf, 1);
925 snprintf(model_name, EDT_NAME_LEN,
926 "EVERVISION-FT5726NEi");
927 break;
928 default:
929 snprintf(model_name, EDT_NAME_LEN,
930 "generic ft5x06 (%02x)",
931 rdbuf[0]);
932 break;
933 }
934 }
935
936 return 0;
937 }
938
939 static void edt_ft5x06_ts_get_defaults(struct device *dev,
940 struct edt_ft5x06_ts_data *tsdata)
941 {
942 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
943 u32 val;
944 int error;
945
946 error = device_property_read_u32(dev, "threshold", &val);
947 if (!error) {
948 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val);
949 tsdata->threshold = val;
950 }
951
952 error = device_property_read_u32(dev, "gain", &val);
953 if (!error) {
954 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val);
955 tsdata->gain = val;
956 }
957
958 error = device_property_read_u32(dev, "offset", &val);
959 if (!error) {
960 if (reg_addr->reg_offset != NO_REGISTER)
961 edt_ft5x06_register_write(tsdata,
962 reg_addr->reg_offset, val);
963 tsdata->offset = val;
964 }
965
966 error = device_property_read_u32(dev, "offset-x", &val);
967 if (!error) {
968 if (reg_addr->reg_offset_x != NO_REGISTER)
969 edt_ft5x06_register_write(tsdata,
970 reg_addr->reg_offset_x, val);
971 tsdata->offset_x = val;
972 }
973
974 error = device_property_read_u32(dev, "offset-y", &val);
975 if (!error) {
976 if (reg_addr->reg_offset_y != NO_REGISTER)
977 edt_ft5x06_register_write(tsdata,
978 reg_addr->reg_offset_y, val);
979 tsdata->offset_y = val;
980 }
981 }
982
983 static void edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
984 {
985 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
986
987 tsdata->threshold = edt_ft5x06_register_read(tsdata,
988 reg_addr->reg_threshold);
989 tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
990 if (reg_addr->reg_offset != NO_REGISTER)
991 tsdata->offset =
992 edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
993 if (reg_addr->reg_offset_x != NO_REGISTER)
994 tsdata->offset_x = edt_ft5x06_register_read(tsdata,
995 reg_addr->reg_offset_x);
996 if (reg_addr->reg_offset_y != NO_REGISTER)
997 tsdata->offset_y = edt_ft5x06_register_read(tsdata,
998 reg_addr->reg_offset_y);
999 if (reg_addr->reg_report_rate != NO_REGISTER)
1000 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
1001 reg_addr->reg_report_rate);
1002 tsdata->num_x = EDT_DEFAULT_NUM_X;
1003 if (reg_addr->reg_num_x != NO_REGISTER)
1004 tsdata->num_x = edt_ft5x06_register_read(tsdata,
1005 reg_addr->reg_num_x);
1006 tsdata->num_y = EDT_DEFAULT_NUM_Y;
1007 if (reg_addr->reg_num_y != NO_REGISTER)
1008 tsdata->num_y = edt_ft5x06_register_read(tsdata,
1009 reg_addr->reg_num_y);
1010 }
1011
1012 static void edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
1013 {
1014 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
1015
1016 switch (tsdata->version) {
1017 case EDT_M06:
1018 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
1019 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
1020 reg_addr->reg_gain = WORK_REGISTER_GAIN;
1021 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
1022 reg_addr->reg_offset_x = NO_REGISTER;
1023 reg_addr->reg_offset_y = NO_REGISTER;
1024 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
1025 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
1026 break;
1027
1028 case EDT_M09:
1029 case EDT_M12:
1030 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1031 reg_addr->reg_report_rate = NO_REGISTER;
1032 reg_addr->reg_gain = M09_REGISTER_GAIN;
1033 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1034 reg_addr->reg_offset_x = NO_REGISTER;
1035 reg_addr->reg_offset_y = NO_REGISTER;
1036 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
1037 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
1038 break;
1039
1040 case EV_FT:
1041 reg_addr->reg_threshold = EV_REGISTER_THRESHOLD;
1042 reg_addr->reg_report_rate = NO_REGISTER;
1043 reg_addr->reg_gain = EV_REGISTER_GAIN;
1044 reg_addr->reg_offset = NO_REGISTER;
1045 reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X;
1046 reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y;
1047 reg_addr->reg_num_x = NO_REGISTER;
1048 reg_addr->reg_num_y = NO_REGISTER;
1049 break;
1050
1051 case GENERIC_FT:
1052 /* this is a guesswork */
1053 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1054 reg_addr->reg_report_rate = NO_REGISTER;
1055 reg_addr->reg_gain = M09_REGISTER_GAIN;
1056 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1057 reg_addr->reg_offset_x = NO_REGISTER;
1058 reg_addr->reg_offset_y = NO_REGISTER;
1059 reg_addr->reg_num_x = NO_REGISTER;
1060 reg_addr->reg_num_y = NO_REGISTER;
1061 break;
1062 }
1063 }
1064
1065 static void edt_ft5x06_disable_regulator(void *arg)
1066 {
1067 struct edt_ft5x06_ts_data *data = arg;
1068
1069 regulator_disable(data->vcc);
1070 }
1071
1072 static int edt_ft5x06_ts_probe(struct i2c_client *client,
1073 const struct i2c_device_id *id)
1074 {
1075 const struct edt_i2c_chip_data *chip_data;
1076 struct edt_ft5x06_ts_data *tsdata;
1077 u8 buf[2] = { 0xfc, 0x00 };
1078 struct input_dev *input;
1079 unsigned long irq_flags;
1080 int error;
1081 char fw_version[EDT_NAME_LEN];
1082
1083 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
1084
1085 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
1086 if (!tsdata) {
1087 dev_err(&client->dev, "failed to allocate driver data.\n");
1088 return -ENOMEM;
1089 }
1090
1091 chip_data = device_get_match_data(&client->dev);
1092 if (!chip_data)
1093 chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
1094 if (!chip_data || !chip_data->max_support_points) {
1095 dev_err(&client->dev, "invalid or missing chip data\n");
1096 return -EINVAL;
1097 }
1098
1099 tsdata->max_support_points = chip_data->max_support_points;
1100
1101 tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
1102 if (IS_ERR(tsdata->vcc)) {
1103 error = PTR_ERR(tsdata->vcc);
1104 if (error != -EPROBE_DEFER)
1105 dev_err(&client->dev,
1106 "failed to request regulator: %d\n", error);
1107 return error;
1108 }
1109
1110 error = regulator_enable(tsdata->vcc);
1111 if (error < 0) {
1112 dev_err(&client->dev, "failed to enable vcc: %d\n", error);
1113 return error;
1114 }
1115
1116 error = devm_add_action_or_reset(&client->dev,
1117 edt_ft5x06_disable_regulator,
1118 tsdata);
1119 if (error)
1120 return error;
1121
1122 tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
1123 "reset", GPIOD_OUT_HIGH);
1124 if (IS_ERR(tsdata->reset_gpio)) {
1125 error = PTR_ERR(tsdata->reset_gpio);
1126 dev_err(&client->dev,
1127 "Failed to request GPIO reset pin, error %d\n", error);
1128 return error;
1129 }
1130
1131 tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
1132 "wake", GPIOD_OUT_LOW);
1133 if (IS_ERR(tsdata->wake_gpio)) {
1134 error = PTR_ERR(tsdata->wake_gpio);
1135 dev_err(&client->dev,
1136 "Failed to request GPIO wake pin, error %d\n", error);
1137 return error;
1138 }
1139
1140 /*
1141 * Check which sleep modes we can support. Power-off requieres the
1142 * reset-pin to ensure correct power-down/power-up behaviour. Start with
1143 * the EDT_PMODE_POWEROFF test since this is the deepest possible sleep
1144 * mode.
1145 */
1146 if (tsdata->reset_gpio)
1147 tsdata->suspend_mode = EDT_PMODE_POWEROFF;
1148 else if (tsdata->wake_gpio)
1149 tsdata->suspend_mode = EDT_PMODE_HIBERNATE;
1150 else
1151 tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED;
1152
1153 if (tsdata->wake_gpio) {
1154 usleep_range(5000, 6000);
1155 gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
1156 }
1157
1158 if (tsdata->reset_gpio) {
1159 usleep_range(5000, 6000);
1160 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
1161 msleep(300);
1162 }
1163
1164 input = devm_input_allocate_device(&client->dev);
1165 if (!input) {
1166 dev_err(&client->dev, "failed to allocate input device.\n");
1167 return -ENOMEM;
1168 }
1169
1170 mutex_init(&tsdata->mutex);
1171 tsdata->client = client;
1172 tsdata->input = input;
1173 tsdata->factory_mode = false;
1174
1175 error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
1176 if (error) {
1177 dev_err(&client->dev, "touchscreen probe failed\n");
1178 return error;
1179 }
1180
1181 /*
1182 * Dummy read access. EP0700MLP1 returns bogus data on the first
1183 * register read access and ignores writes.
1184 */
1185 edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf);
1186
1187 edt_ft5x06_ts_set_regs(tsdata);
1188 edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
1189 edt_ft5x06_ts_get_parameters(tsdata);
1190
1191 dev_dbg(&client->dev,
1192 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1193 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1194
1195 input->name = tsdata->name;
1196 input->id.bustype = BUS_I2C;
1197 input->dev.parent = &client->dev;
1198
1199 input_set_abs_params(input, ABS_MT_POSITION_X,
1200 0, tsdata->num_x * 64 - 1, 0, 0);
1201 input_set_abs_params(input, ABS_MT_POSITION_Y,
1202 0, tsdata->num_y * 64 - 1, 0, 0);
1203
1204 touchscreen_parse_properties(input, true, &tsdata->prop);
1205
1206 error = input_mt_init_slots(input, tsdata->max_support_points,
1207 INPUT_MT_DIRECT);
1208 if (error) {
1209 dev_err(&client->dev, "Unable to init MT slots.\n");
1210 return error;
1211 }
1212
1213 i2c_set_clientdata(client, tsdata);
1214
1215 irq_flags = irq_get_trigger_type(client->irq);
1216 if (irq_flags == IRQF_TRIGGER_NONE)
1217 irq_flags = IRQF_TRIGGER_FALLING;
1218 irq_flags |= IRQF_ONESHOT;
1219
1220 error = devm_request_threaded_irq(&client->dev, client->irq,
1221 NULL, edt_ft5x06_ts_isr, irq_flags,
1222 client->name, tsdata);
1223 if (error) {
1224 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1225 return error;
1226 }
1227
1228 error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);
1229 if (error)
1230 return error;
1231
1232 error = input_register_device(input);
1233 if (error)
1234 return error;
1235
1236 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1237
1238 dev_dbg(&client->dev,
1239 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1240 client->irq,
1241 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
1242 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
1243
1244 return 0;
1245 }
1246
1247 static int edt_ft5x06_ts_remove(struct i2c_client *client)
1248 {
1249 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1250
1251 edt_ft5x06_ts_teardown_debugfs(tsdata);
1252
1253 return 0;
1254 }
1255
1256 static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1257 {
1258 struct i2c_client *client = to_i2c_client(dev);
1259 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1260 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1261 int ret;
1262
1263 if (device_may_wakeup(dev))
1264 return 0;
1265
1266 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1267 return 0;
1268
1269 /* Enter hibernate mode. */
1270 ret = edt_ft5x06_register_write(tsdata, PMOD_REGISTER_OPMODE,
1271 PMOD_REGISTER_HIBERNATE);
1272 if (ret)
1273 dev_warn(dev, "Failed to set hibernate mode\n");
1274
1275 if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE)
1276 return 0;
1277
1278 /*
1279 * Power-off according the datasheet. Cut the power may leaf the irq
1280 * line in an undefined state depending on the host pull resistor
1281 * settings. Disable the irq to avoid adjusting each host till the
1282 * device is back in a full functional state.
1283 */
1284 disable_irq(tsdata->client->irq);
1285
1286 gpiod_set_value_cansleep(reset_gpio, 1);
1287 usleep_range(1000, 2000);
1288
1289 ret = regulator_disable(tsdata->vcc);
1290 if (ret)
1291 dev_warn(dev, "Failed to disable vcc\n");
1292
1293 return 0;
1294 }
1295
1296 static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1297 {
1298 struct i2c_client *client = to_i2c_client(dev);
1299 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1300 int ret = 0;
1301
1302 if (device_may_wakeup(dev))
1303 return 0;
1304
1305 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1306 return 0;
1307
1308 if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) {
1309 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1310
1311 /*
1312 * We can't check if the regulator is a dummy or a real
1313 * regulator. So we need to specify the 5ms reset time (T_rst)
1314 * here instead of the 100us T_rtp time. We also need to wait
1315 * 300ms in case it was a real supply and the power was cutted
1316 * of. Toggle the reset pin is also a way to exit the hibernate
1317 * mode.
1318 */
1319 gpiod_set_value_cansleep(reset_gpio, 1);
1320 usleep_range(5000, 6000);
1321
1322 ret = regulator_enable(tsdata->vcc);
1323 if (ret) {
1324 dev_err(dev, "Failed to enable vcc\n");
1325 return ret;
1326 }
1327
1328 usleep_range(1000, 2000);
1329 gpiod_set_value_cansleep(reset_gpio, 0);
1330 msleep(300);
1331
1332 edt_ft5x06_restore_reg_parameters(tsdata);
1333 enable_irq(tsdata->client->irq);
1334
1335 if (tsdata->factory_mode)
1336 ret = edt_ft5x06_factory_mode(tsdata);
1337 } else {
1338 struct gpio_desc *wake_gpio = tsdata->wake_gpio;
1339
1340 gpiod_set_value_cansleep(wake_gpio, 0);
1341 usleep_range(5000, 6000);
1342 gpiod_set_value_cansleep(wake_gpio, 1);
1343 }
1344
1345
1346 return ret;
1347 }
1348
1349 static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1350 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1351
1352 static const struct edt_i2c_chip_data edt_ft5x06_data = {
1353 .max_support_points = 5,
1354 };
1355
1356 static const struct edt_i2c_chip_data edt_ft5506_data = {
1357 .max_support_points = 10,
1358 };
1359
1360 static const struct edt_i2c_chip_data edt_ft6236_data = {
1361 .max_support_points = 2,
1362 };
1363
1364 static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1365 { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
1366 { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
1367 { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data },
1368 /* Note no edt- prefix for compatibility with the ft6236.c driver */
1369 { .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
1370 { /* sentinel */ }
1371 };
1372 MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1373
1374 static const struct of_device_id edt_ft5x06_of_match[] = {
1375 { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
1376 { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
1377 { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
1378 { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
1379 { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data },
1380 /* Note focaltech vendor prefix for compatibility with ft6236.c */
1381 { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
1382 { /* sentinel */ }
1383 };
1384 MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1385
1386 static struct i2c_driver edt_ft5x06_ts_driver = {
1387 .driver = {
1388 .name = "edt_ft5x06",
1389 .of_match_table = edt_ft5x06_of_match,
1390 .pm = &edt_ft5x06_ts_pm_ops,
1391 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1392 },
1393 .id_table = edt_ft5x06_ts_id,
1394 .probe = edt_ft5x06_ts_probe,
1395 .remove = edt_ft5x06_ts_remove,
1396 };
1397
1398 module_i2c_driver(edt_ft5x06_ts_driver);
1399
1400 MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1401 MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1402 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support