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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
69#define EDT_RAW_DATA_RETRIES 100
70#define EDT_RAW_DATA_DELAY 1000
71
72enum edt_pmode {
73 EDT_PMODE_NOT_SUPPORTED,
74 EDT_PMODE_HIBERNATE,
75 EDT_PMODE_POWEROFF,
76};
77
78enum edt_ver {
79 EDT_M06,
80 EDT_M09,
81 EDT_M12,
82 EV_FT,
83 GENERIC_FT,
84};
85
86struct edt_reg_addr {
87 int reg_threshold;
88 int reg_report_rate;
89 int reg_gain;
90 int reg_offset;
91 int reg_offset_x;
92 int reg_offset_y;
93 int reg_num_x;
94 int reg_num_y;
95};
96
97struct edt_ft5x06_ts_data {
98 struct i2c_client *client;
99 struct input_dev *input;
100 struct touchscreen_properties prop;
101 u16 num_x;
102 u16 num_y;
103 struct regulator *vcc;
104
105 struct gpio_desc *reset_gpio;
106 struct gpio_desc *wake_gpio;
107
108#if defined(CONFIG_DEBUG_FS)
109 struct dentry *debug_dir;
110 u8 *raw_buffer;
111 size_t raw_bufsize;
112#endif
113
114 struct mutex mutex;
115 bool factory_mode;
116 enum edt_pmode suspend_mode;
117 int threshold;
118 int gain;
119 int offset;
120 int offset_x;
121 int offset_y;
122 int report_rate;
123 int max_support_points;
124
125 char name[EDT_NAME_LEN];
126
127 struct edt_reg_addr reg_addr;
128 enum edt_ver version;
129};
130
131struct edt_i2c_chip_data {
132 int max_support_points;
133};
134
135static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
136 u16 wr_len, u8 *wr_buf,
137 u16 rd_len, u8 *rd_buf)
138{
139 struct i2c_msg wrmsg[2];
140 int i = 0;
141 int ret;
142
143 if (wr_len) {
144 wrmsg[i].addr = client->addr;
145 wrmsg[i].flags = 0;
146 wrmsg[i].len = wr_len;
147 wrmsg[i].buf = wr_buf;
148 i++;
149 }
150 if (rd_len) {
151 wrmsg[i].addr = client->addr;
152 wrmsg[i].flags = I2C_M_RD;
153 wrmsg[i].len = rd_len;
154 wrmsg[i].buf = rd_buf;
155 i++;
156 }
157
158 ret = i2c_transfer(client->adapter, wrmsg, i);
159 if (ret < 0)
160 return ret;
161 if (ret != i)
162 return -EIO;
163
164 return 0;
165}
166
167static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
168 u8 *buf, int buflen)
169{
170 int i;
171 u8 crc = 0;
172
173 for (i = 0; i < buflen - 1; i++)
174 crc ^= buf[i];
175
176 if (crc != buf[buflen-1]) {
177 dev_err_ratelimited(&tsdata->client->dev,
178 "crc error: 0x%02x expected, got 0x%02x\n",
179 crc, buf[buflen-1]);
180 return false;
181 }
182
183 return true;
184}
185
186static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
187{
188 struct edt_ft5x06_ts_data *tsdata = dev_id;
189 struct device *dev = &tsdata->client->dev;
190 u8 cmd;
191 u8 rdbuf[63];
192 int i, type, x, y, id;
193 int offset, tplen, datalen, crclen;
194 int error;
195
196 switch (tsdata->version) {
197 case EDT_M06:
198 cmd = 0xf9;
199 offset = 5;
200 tplen = 4;
201 crclen = 1;
202 break;
203
204 case EDT_M09:
205 case EDT_M12:
206 case EV_FT:
207 case GENERIC_FT:
208 cmd = 0x0;
209 offset = 3;
210 tplen = 6;
211 crclen = 0;
212 break;
213
214 default:
215 goto out;
216 }
217
218 memset(rdbuf, 0, sizeof(rdbuf));
219 datalen = tplen * tsdata->max_support_points + offset + crclen;
220
221 error = edt_ft5x06_ts_readwrite(tsdata->client,
222 sizeof(cmd), &cmd,
223 datalen, rdbuf);
224 if (error) {
225 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
226 error);
227 goto out;
228 }
229
230
231 if (tsdata->version == EDT_M06) {
232 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
233 rdbuf[2] != datalen) {
234 dev_err_ratelimited(dev,
235 "Unexpected header: %02x%02x%02x!\n",
236 rdbuf[0], rdbuf[1], rdbuf[2]);
237 goto out;
238 }
239
240 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
241 goto out;
242 }
243
244 for (i = 0; i < tsdata->max_support_points; i++) {
245 u8 *buf = &rdbuf[i * tplen + offset];
246
247 type = buf[0] >> 6;
248
249 if (type == TOUCH_EVENT_RESERVED)
250 continue;
251
252
253 if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
254 continue;
255
256 x = get_unaligned_be16(buf) & 0x0fff;
257 y = get_unaligned_be16(buf + 2) & 0x0fff;
258
259 if (tsdata->version == EV_FT)
260 swap(x, y);
261
262 id = (buf[2] >> 4) & 0x0f;
263
264 input_mt_slot(tsdata->input, id);
265 if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
266 type != TOUCH_EVENT_UP))
267 touchscreen_report_pos(tsdata->input, &tsdata->prop,
268 x, y, true);
269 }
270
271 input_mt_report_pointer_emulation(tsdata->input, true);
272 input_sync(tsdata->input);
273
274out:
275 return IRQ_HANDLED;
276}
277
278static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
279 u8 addr, u8 value)
280{
281 u8 wrbuf[4];
282
283 switch (tsdata->version) {
284 case EDT_M06:
285 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
286 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
287 wrbuf[2] = value;
288 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
289 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
290 wrbuf, 0, NULL);
291
292 case EDT_M09:
293 case EDT_M12:
294 case EV_FT:
295 case GENERIC_FT:
296 wrbuf[0] = addr;
297 wrbuf[1] = value;
298
299 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
300 wrbuf, 0, NULL);
301
302 default:
303 return -EINVAL;
304 }
305}
306
307static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
308 u8 addr)
309{
310 u8 wrbuf[2], rdbuf[2];
311 int error;
312
313 switch (tsdata->version) {
314 case EDT_M06:
315 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
316 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
317 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
318
319 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
320 rdbuf);
321 if (error)
322 return error;
323
324 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
325 dev_err(&tsdata->client->dev,
326 "crc error: 0x%02x expected, got 0x%02x\n",
327 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
328 rdbuf[1]);
329 return -EIO;
330 }
331 break;
332
333 case EDT_M09:
334 case EDT_M12:
335 case EV_FT:
336 case GENERIC_FT:
337 wrbuf[0] = addr;
338 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
339 wrbuf, 1, rdbuf);
340 if (error)
341 return error;
342 break;
343
344 default:
345 return -EINVAL;
346 }
347
348 return rdbuf[0];
349}
350
351struct edt_ft5x06_attribute {
352 struct device_attribute dattr;
353 size_t field_offset;
354 u8 limit_low;
355 u8 limit_high;
356 u8 addr_m06;
357 u8 addr_m09;
358 u8 addr_ev;
359};
360
361#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev, \
362 _limit_low, _limit_high) \
363 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
364 .dattr = __ATTR(_field, _mode, \
365 edt_ft5x06_setting_show, \
366 edt_ft5x06_setting_store), \
367 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
368 .addr_m06 = _addr_m06, \
369 .addr_m09 = _addr_m09, \
370 .addr_ev = _addr_ev, \
371 .limit_low = _limit_low, \
372 .limit_high = _limit_high, \
373 }
374
375static ssize_t edt_ft5x06_setting_show(struct device *dev,
376 struct device_attribute *dattr,
377 char *buf)
378{
379 struct i2c_client *client = to_i2c_client(dev);
380 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
381 struct edt_ft5x06_attribute *attr =
382 container_of(dattr, struct edt_ft5x06_attribute, dattr);
383 u8 *field = (u8 *)tsdata + attr->field_offset;
384 int val;
385 size_t count = 0;
386 int error = 0;
387 u8 addr;
388
389 mutex_lock(&tsdata->mutex);
390
391 if (tsdata->factory_mode) {
392 error = -EIO;
393 goto out;
394 }
395
396 switch (tsdata->version) {
397 case EDT_M06:
398 addr = attr->addr_m06;
399 break;
400
401 case EDT_M09:
402 case EDT_M12:
403 case GENERIC_FT:
404 addr = attr->addr_m09;
405 break;
406
407 case EV_FT:
408 addr = attr->addr_ev;
409 break;
410
411 default:
412 error = -ENODEV;
413 goto out;
414 }
415
416 if (addr != NO_REGISTER) {
417 val = edt_ft5x06_register_read(tsdata, addr);
418 if (val < 0) {
419 error = val;
420 dev_err(&tsdata->client->dev,
421 "Failed to fetch attribute %s, error %d\n",
422 dattr->attr.name, error);
423 goto out;
424 }
425 } else {
426 val = *field;
427 }
428
429 if (val != *field) {
430 dev_warn(&tsdata->client->dev,
431 "%s: read (%d) and stored value (%d) differ\n",
432 dattr->attr.name, val, *field);
433 *field = val;
434 }
435
436 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
437out:
438 mutex_unlock(&tsdata->mutex);
439 return error ?: count;
440}
441
442static ssize_t edt_ft5x06_setting_store(struct device *dev,
443 struct device_attribute *dattr,
444 const char *buf, size_t count)
445{
446 struct i2c_client *client = to_i2c_client(dev);
447 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
448 struct edt_ft5x06_attribute *attr =
449 container_of(dattr, struct edt_ft5x06_attribute, dattr);
450 u8 *field = (u8 *)tsdata + attr->field_offset;
451 unsigned int val;
452 int error;
453 u8 addr;
454
455 mutex_lock(&tsdata->mutex);
456
457 if (tsdata->factory_mode) {
458 error = -EIO;
459 goto out;
460 }
461
462 error = kstrtouint(buf, 0, &val);
463 if (error)
464 goto out;
465
466 if (val < attr->limit_low || val > attr->limit_high) {
467 error = -ERANGE;
468 goto out;
469 }
470
471 switch (tsdata->version) {
472 case EDT_M06:
473 addr = attr->addr_m06;
474 break;
475
476 case EDT_M09:
477 case EDT_M12:
478 case GENERIC_FT:
479 addr = attr->addr_m09;
480 break;
481
482 case EV_FT:
483 addr = attr->addr_ev;
484 break;
485
486 default:
487 error = -ENODEV;
488 goto out;
489 }
490
491 if (addr != NO_REGISTER) {
492 error = edt_ft5x06_register_write(tsdata, addr, val);
493 if (error) {
494 dev_err(&tsdata->client->dev,
495 "Failed to update attribute %s, error: %d\n",
496 dattr->attr.name, error);
497 goto out;
498 }
499 }
500 *field = val;
501
502out:
503 mutex_unlock(&tsdata->mutex);
504 return error ?: count;
505}
506
507
508static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
509 M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31);
510
511static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
512 M09_REGISTER_OFFSET, NO_REGISTER, 0, 31);
513
514static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
515 EV_REGISTER_OFFSET_X, 0, 80);
516
517static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
518 EV_REGISTER_OFFSET_Y, 0, 80);
519
520static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
521 M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255);
522
523static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
524 NO_REGISTER, NO_REGISTER, 0, 255);
525
526static struct attribute *edt_ft5x06_attrs[] = {
527 &edt_ft5x06_attr_gain.dattr.attr,
528 &edt_ft5x06_attr_offset.dattr.attr,
529 &edt_ft5x06_attr_offset_x.dattr.attr,
530 &edt_ft5x06_attr_offset_y.dattr.attr,
531 &edt_ft5x06_attr_threshold.dattr.attr,
532 &edt_ft5x06_attr_report_rate.dattr.attr,
533 NULL
534};
535
536static const struct attribute_group edt_ft5x06_attr_group = {
537 .attrs = edt_ft5x06_attrs,
538};
539
540static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata)
541{
542 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
543
544 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
545 tsdata->threshold);
546 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
547 tsdata->gain);
548 if (reg_addr->reg_offset != NO_REGISTER)
549 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
550 tsdata->offset);
551 if (reg_addr->reg_offset_x != NO_REGISTER)
552 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x,
553 tsdata->offset_x);
554 if (reg_addr->reg_offset_y != NO_REGISTER)
555 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y,
556 tsdata->offset_y);
557 if (reg_addr->reg_report_rate != NO_REGISTER)
558 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
559 tsdata->report_rate);
560
561}
562
563#ifdef CONFIG_DEBUG_FS
564static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
565{
566 struct i2c_client *client = tsdata->client;
567 int retries = EDT_SWITCH_MODE_RETRIES;
568 int ret;
569 int error;
570
571 if (tsdata->version != EDT_M06) {
572 dev_err(&client->dev,
573 "No factory mode support for non-M06 devices\n");
574 return -EINVAL;
575 }
576
577 disable_irq(client->irq);
578
579 if (!tsdata->raw_buffer) {
580 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
581 sizeof(u16);
582 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
583 if (!tsdata->raw_buffer) {
584 error = -ENOMEM;
585 goto err_out;
586 }
587 }
588
589
590 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
591 if (error) {
592 dev_err(&client->dev,
593 "failed to switch to factory mode, error %d\n", error);
594 goto err_out;
595 }
596
597 tsdata->factory_mode = true;
598 do {
599 mdelay(EDT_SWITCH_MODE_DELAY);
600
601 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
602 if (ret == 0x03)
603 break;
604 } while (--retries > 0);
605
606 if (retries == 0) {
607 dev_err(&client->dev, "not in factory mode after %dms.\n",
608 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
609 error = -EIO;
610 goto err_out;
611 }
612
613 return 0;
614
615err_out:
616 kfree(tsdata->raw_buffer);
617 tsdata->raw_buffer = NULL;
618 tsdata->factory_mode = false;
619 enable_irq(client->irq);
620
621 return error;
622}
623
624static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
625{
626 struct i2c_client *client = tsdata->client;
627 int retries = EDT_SWITCH_MODE_RETRIES;
628 int ret;
629 int error;
630
631
632 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
633 if (error) {
634 dev_err(&client->dev,
635 "failed to switch to work mode, error: %d\n", error);
636 return error;
637 }
638
639 tsdata->factory_mode = false;
640
641 do {
642 mdelay(EDT_SWITCH_MODE_DELAY);
643
644 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
645 if (ret == 0x01)
646 break;
647 } while (--retries > 0);
648
649 if (retries == 0) {
650 dev_err(&client->dev, "not in work mode after %dms.\n",
651 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
652 tsdata->factory_mode = true;
653 return -EIO;
654 }
655
656 kfree(tsdata->raw_buffer);
657 tsdata->raw_buffer = NULL;
658
659 edt_ft5x06_restore_reg_parameters(tsdata);
660 enable_irq(client->irq);
661
662 return 0;
663}
664
665static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
666{
667 struct edt_ft5x06_ts_data *tsdata = data;
668
669 *mode = tsdata->factory_mode;
670
671 return 0;
672};
673
674static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
675{
676 struct edt_ft5x06_ts_data *tsdata = data;
677 int retval = 0;
678
679 if (mode > 1)
680 return -ERANGE;
681
682 mutex_lock(&tsdata->mutex);
683
684 if (mode != tsdata->factory_mode) {
685 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
686 edt_ft5x06_work_mode(tsdata);
687 }
688
689 mutex_unlock(&tsdata->mutex);
690
691 return retval;
692};
693
694DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
695 edt_ft5x06_debugfs_mode_set, "%llu\n");
696
697static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
698 char __user *buf, size_t count, loff_t *off)
699{
700 struct edt_ft5x06_ts_data *tsdata = file->private_data;
701 struct i2c_client *client = tsdata->client;
702 int retries = EDT_RAW_DATA_RETRIES;
703 int val, i, error;
704 size_t read = 0;
705 int colbytes;
706 char wrbuf[3];
707 u8 *rdbuf;
708
709 if (*off < 0 || *off >= tsdata->raw_bufsize)
710 return 0;
711
712 mutex_lock(&tsdata->mutex);
713
714 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
715 error = -EIO;
716 goto out;
717 }
718
719 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
720 if (error) {
721 dev_dbg(&client->dev,
722 "failed to write 0x08 register, error %d\n", error);
723 goto out;
724 }
725
726 do {
727 usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
728 val = edt_ft5x06_register_read(tsdata, 0x08);
729 if (val < 1)
730 break;
731 } while (--retries > 0);
732
733 if (val < 0) {
734 error = val;
735 dev_dbg(&client->dev,
736 "failed to read 0x08 register, error %d\n", error);
737 goto out;
738 }
739
740 if (retries == 0) {
741 dev_dbg(&client->dev,
742 "timed out waiting for register to settle\n");
743 error = -ETIMEDOUT;
744 goto out;
745 }
746
747 rdbuf = tsdata->raw_buffer;
748 colbytes = tsdata->num_y * sizeof(u16);
749
750 wrbuf[0] = 0xf5;
751 wrbuf[1] = 0x0e;
752 for (i = 0; i < tsdata->num_x; i++) {
753 wrbuf[2] = i;
754 error = edt_ft5x06_ts_readwrite(tsdata->client,
755 sizeof(wrbuf), wrbuf,
756 colbytes, rdbuf);
757 if (error)
758 goto out;
759
760 rdbuf += colbytes;
761 }
762
763 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
764 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
765 error = -EFAULT;
766 goto out;
767 }
768
769 *off += read;
770out:
771 mutex_unlock(&tsdata->mutex);
772 return error ?: read;
773};
774
775static const struct file_operations debugfs_raw_data_fops = {
776 .open = simple_open,
777 .read = edt_ft5x06_debugfs_raw_data_read,
778};
779
780static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
781 const char *debugfs_name)
782{
783 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
784
785 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
786 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
787
788 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
789 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
790 debugfs_create_file("raw_data", S_IRUSR,
791 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
792}
793
794static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
795{
796 debugfs_remove_recursive(tsdata->debug_dir);
797 kfree(tsdata->raw_buffer);
798}
799
800#else
801
802static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
803{
804 return -ENOSYS;
805}
806
807static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
808 const char *debugfs_name)
809{
810}
811
812static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
813{
814}
815
816#endif
817
818static int edt_ft5x06_ts_identify(struct i2c_client *client,
819 struct edt_ft5x06_ts_data *tsdata,
820 char *fw_version)
821{
822 u8 rdbuf[EDT_NAME_LEN];
823 char *p;
824 int error;
825 char *model_name = tsdata->name;
826
827
828
829
830
831 memset(rdbuf, 0, sizeof(rdbuf));
832 error = edt_ft5x06_ts_readwrite(client, 1, "\xBB",
833 EDT_NAME_LEN - 1, rdbuf);
834 if (error)
835 return error;
836
837
838
839
840
841 if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
842 tsdata->version = EDT_M06;
843
844
845 rdbuf[EDT_NAME_LEN - 1] = '\0';
846 if (rdbuf[EDT_NAME_LEN - 2] == '$')
847 rdbuf[EDT_NAME_LEN - 2] = '\0';
848
849
850 p = strchr(rdbuf, '*');
851 if (p)
852 *p++ = '\0';
853 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
854 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
855 } else if (!strncasecmp(rdbuf, "EP0", 3)) {
856 tsdata->version = EDT_M12;
857
858
859 rdbuf[EDT_NAME_LEN - 2] = '\0';
860 if (rdbuf[EDT_NAME_LEN - 3] == '$')
861 rdbuf[EDT_NAME_LEN - 3] = '\0';
862
863
864 p = strchr(rdbuf, '*');
865 if (p)
866 *p++ = '\0';
867 strlcpy(model_name, rdbuf, EDT_NAME_LEN);
868 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
869 } else {
870
871
872
873
874
875
876
877
878
879 tsdata->version = GENERIC_FT;
880
881 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
882 2, rdbuf);
883 if (error)
884 return error;
885
886 strlcpy(fw_version, rdbuf, 2);
887
888 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
889 1, rdbuf);
890 if (error)
891 return error;
892
893
894
895
896
897 switch (rdbuf[0]) {
898 case 0x35:
899 case 0x43:
900 case 0x50:
901 case 0x57:
902 case 0x70:
903 tsdata->version = EDT_M09;
904 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
905 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
906 break;
907 case 0xa1:
908 tsdata->version = EDT_M09;
909 snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00",
910 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
911 break;
912 case 0x5a:
913 snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0");
914 break;
915 case 0x59:
916 tsdata->version = EV_FT;
917 error = edt_ft5x06_ts_readwrite(client, 1, "\x53",
918 1, rdbuf);
919 if (error)
920 return error;
921 strlcpy(fw_version, rdbuf, 1);
922 snprintf(model_name, EDT_NAME_LEN,
923 "EVERVISION-FT5726NEi");
924 break;
925 default:
926 snprintf(model_name, EDT_NAME_LEN,
927 "generic ft5x06 (%02x)",
928 rdbuf[0]);
929 break;
930 }
931 }
932
933 return 0;
934}
935
936static void edt_ft5x06_ts_get_defaults(struct device *dev,
937 struct edt_ft5x06_ts_data *tsdata)
938{
939 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
940 u32 val;
941 int error;
942
943 error = device_property_read_u32(dev, "threshold", &val);
944 if (!error) {
945 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val);
946 tsdata->threshold = val;
947 }
948
949 error = device_property_read_u32(dev, "gain", &val);
950 if (!error) {
951 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val);
952 tsdata->gain = val;
953 }
954
955 error = device_property_read_u32(dev, "offset", &val);
956 if (!error) {
957 if (reg_addr->reg_offset != NO_REGISTER)
958 edt_ft5x06_register_write(tsdata,
959 reg_addr->reg_offset, val);
960 tsdata->offset = val;
961 }
962
963 error = device_property_read_u32(dev, "offset-x", &val);
964 if (!error) {
965 if (reg_addr->reg_offset_x != NO_REGISTER)
966 edt_ft5x06_register_write(tsdata,
967 reg_addr->reg_offset_x, val);
968 tsdata->offset_x = val;
969 }
970
971 error = device_property_read_u32(dev, "offset-y", &val);
972 if (!error) {
973 if (reg_addr->reg_offset_y != NO_REGISTER)
974 edt_ft5x06_register_write(tsdata,
975 reg_addr->reg_offset_y, val);
976 tsdata->offset_y = val;
977 }
978}
979
980static void
981edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
982{
983 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
984
985 tsdata->threshold = edt_ft5x06_register_read(tsdata,
986 reg_addr->reg_threshold);
987 tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
988 if (reg_addr->reg_offset != NO_REGISTER)
989 tsdata->offset =
990 edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
991 if (reg_addr->reg_offset_x != NO_REGISTER)
992 tsdata->offset_x = edt_ft5x06_register_read(tsdata,
993 reg_addr->reg_offset_x);
994 if (reg_addr->reg_offset_y != NO_REGISTER)
995 tsdata->offset_y = edt_ft5x06_register_read(tsdata,
996 reg_addr->reg_offset_y);
997 if (reg_addr->reg_report_rate != NO_REGISTER)
998 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
999 reg_addr->reg_report_rate);
1000 if (tsdata->version == EDT_M06 ||
1001 tsdata->version == EDT_M09 ||
1002 tsdata->version == EDT_M12) {
1003 tsdata->num_x = edt_ft5x06_register_read(tsdata,
1004 reg_addr->reg_num_x);
1005 tsdata->num_y = edt_ft5x06_register_read(tsdata,
1006 reg_addr->reg_num_y);
1007 } else {
1008 tsdata->num_x = -1;
1009 tsdata->num_y = -1;
1010 }
1011}
1012
1013static void
1014edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
1015{
1016 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
1017
1018 switch (tsdata->version) {
1019 case EDT_M06:
1020 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
1021 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
1022 reg_addr->reg_gain = WORK_REGISTER_GAIN;
1023 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
1024 reg_addr->reg_offset_x = NO_REGISTER;
1025 reg_addr->reg_offset_y = NO_REGISTER;
1026 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
1027 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
1028 break;
1029
1030 case EDT_M09:
1031 case EDT_M12:
1032 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1033 reg_addr->reg_report_rate = NO_REGISTER;
1034 reg_addr->reg_gain = M09_REGISTER_GAIN;
1035 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1036 reg_addr->reg_offset_x = NO_REGISTER;
1037 reg_addr->reg_offset_y = NO_REGISTER;
1038 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
1039 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
1040 break;
1041
1042 case EV_FT:
1043 reg_addr->reg_threshold = EV_REGISTER_THRESHOLD;
1044 reg_addr->reg_gain = EV_REGISTER_GAIN;
1045 reg_addr->reg_offset = NO_REGISTER;
1046 reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X;
1047 reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y;
1048 reg_addr->reg_num_x = NO_REGISTER;
1049 reg_addr->reg_num_y = NO_REGISTER;
1050 reg_addr->reg_report_rate = NO_REGISTER;
1051 break;
1052
1053 case GENERIC_FT:
1054
1055 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1056 reg_addr->reg_gain = M09_REGISTER_GAIN;
1057 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1058 reg_addr->reg_offset_x = NO_REGISTER;
1059 reg_addr->reg_offset_y = NO_REGISTER;
1060 break;
1061 }
1062}
1063
1064static void edt_ft5x06_disable_regulator(void *arg)
1065{
1066 struct edt_ft5x06_ts_data *data = arg;
1067
1068 regulator_disable(data->vcc);
1069}
1070
1071static int edt_ft5x06_ts_probe(struct i2c_client *client,
1072 const struct i2c_device_id *id)
1073{
1074 const struct edt_i2c_chip_data *chip_data;
1075 struct edt_ft5x06_ts_data *tsdata;
1076 u8 buf[2] = { 0xfc, 0x00 };
1077 struct input_dev *input;
1078 unsigned long irq_flags;
1079 int error;
1080 char fw_version[EDT_NAME_LEN];
1081
1082 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
1083
1084 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
1085 if (!tsdata) {
1086 dev_err(&client->dev, "failed to allocate driver data.\n");
1087 return -ENOMEM;
1088 }
1089
1090 chip_data = device_get_match_data(&client->dev);
1091 if (!chip_data)
1092 chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
1093 if (!chip_data || !chip_data->max_support_points) {
1094 dev_err(&client->dev, "invalid or missing chip data\n");
1095 return -EINVAL;
1096 }
1097
1098 tsdata->max_support_points = chip_data->max_support_points;
1099
1100 tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
1101 if (IS_ERR(tsdata->vcc)) {
1102 error = PTR_ERR(tsdata->vcc);
1103 if (error != -EPROBE_DEFER)
1104 dev_err(&client->dev,
1105 "failed to request regulator: %d\n", error);
1106 return error;
1107 }
1108
1109 error = regulator_enable(tsdata->vcc);
1110 if (error < 0) {
1111 dev_err(&client->dev, "failed to enable vcc: %d\n", error);
1112 return error;
1113 }
1114
1115 error = devm_add_action_or_reset(&client->dev,
1116 edt_ft5x06_disable_regulator,
1117 tsdata);
1118 if (error)
1119 return error;
1120
1121 tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
1122 "reset", GPIOD_OUT_HIGH);
1123 if (IS_ERR(tsdata->reset_gpio)) {
1124 error = PTR_ERR(tsdata->reset_gpio);
1125 dev_err(&client->dev,
1126 "Failed to request GPIO reset pin, error %d\n", error);
1127 return error;
1128 }
1129
1130 tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
1131 "wake", GPIOD_OUT_LOW);
1132 if (IS_ERR(tsdata->wake_gpio)) {
1133 error = PTR_ERR(tsdata->wake_gpio);
1134 dev_err(&client->dev,
1135 "Failed to request GPIO wake pin, error %d\n", error);
1136 return error;
1137 }
1138
1139
1140
1141
1142
1143
1144
1145 if (tsdata->reset_gpio)
1146 tsdata->suspend_mode = EDT_PMODE_POWEROFF;
1147 else if (tsdata->wake_gpio)
1148 tsdata->suspend_mode = EDT_PMODE_HIBERNATE;
1149 else
1150 tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED;
1151
1152 if (tsdata->wake_gpio) {
1153 usleep_range(5000, 6000);
1154 gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
1155 }
1156
1157 if (tsdata->reset_gpio) {
1158 usleep_range(5000, 6000);
1159 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
1160 msleep(300);
1161 }
1162
1163 input = devm_input_allocate_device(&client->dev);
1164 if (!input) {
1165 dev_err(&client->dev, "failed to allocate input device.\n");
1166 return -ENOMEM;
1167 }
1168
1169 mutex_init(&tsdata->mutex);
1170 tsdata->client = client;
1171 tsdata->input = input;
1172 tsdata->factory_mode = false;
1173
1174 error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
1175 if (error) {
1176 dev_err(&client->dev, "touchscreen probe failed\n");
1177 return error;
1178 }
1179
1180
1181
1182
1183
1184 edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf);
1185
1186 edt_ft5x06_ts_set_regs(tsdata);
1187 edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
1188 edt_ft5x06_ts_get_parameters(tsdata);
1189
1190 dev_dbg(&client->dev,
1191 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1192 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1193
1194 input->name = tsdata->name;
1195 input->id.bustype = BUS_I2C;
1196 input->dev.parent = &client->dev;
1197
1198 if (tsdata->version == EDT_M06 ||
1199 tsdata->version == EDT_M09 ||
1200 tsdata->version == EDT_M12) {
1201 input_set_abs_params(input, ABS_MT_POSITION_X,
1202 0, tsdata->num_x * 64 - 1, 0, 0);
1203 input_set_abs_params(input, ABS_MT_POSITION_Y,
1204 0, tsdata->num_y * 64 - 1, 0, 0);
1205 } else {
1206
1207 input_set_abs_params(input, ABS_MT_POSITION_X,
1208 0, 65535, 0, 0);
1209 input_set_abs_params(input, ABS_MT_POSITION_Y,
1210 0, 65535, 0, 0);
1211 }
1212
1213 touchscreen_parse_properties(input, true, &tsdata->prop);
1214
1215 error = input_mt_init_slots(input, tsdata->max_support_points,
1216 INPUT_MT_DIRECT);
1217 if (error) {
1218 dev_err(&client->dev, "Unable to init MT slots.\n");
1219 return error;
1220 }
1221
1222 i2c_set_clientdata(client, tsdata);
1223
1224 irq_flags = irq_get_trigger_type(client->irq);
1225 if (irq_flags == IRQF_TRIGGER_NONE)
1226 irq_flags = IRQF_TRIGGER_FALLING;
1227 irq_flags |= IRQF_ONESHOT;
1228
1229 error = devm_request_threaded_irq(&client->dev, client->irq,
1230 NULL, edt_ft5x06_ts_isr, irq_flags,
1231 client->name, tsdata);
1232 if (error) {
1233 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1234 return error;
1235 }
1236
1237 error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);
1238 if (error)
1239 return error;
1240
1241 error = input_register_device(input);
1242 if (error)
1243 return error;
1244
1245 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1246
1247 dev_dbg(&client->dev,
1248 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1249 client->irq,
1250 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
1251 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
1252
1253 return 0;
1254}
1255
1256static int edt_ft5x06_ts_remove(struct i2c_client *client)
1257{
1258 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1259
1260 edt_ft5x06_ts_teardown_debugfs(tsdata);
1261
1262 return 0;
1263}
1264
1265static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1266{
1267 struct i2c_client *client = to_i2c_client(dev);
1268 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1269 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1270 int ret;
1271
1272 if (device_may_wakeup(dev))
1273 return 0;
1274
1275 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1276 return 0;
1277
1278
1279 ret = edt_ft5x06_register_write(tsdata, PMOD_REGISTER_OPMODE,
1280 PMOD_REGISTER_HIBERNATE);
1281 if (ret)
1282 dev_warn(dev, "Failed to set hibernate mode\n");
1283
1284 if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE)
1285 return 0;
1286
1287
1288
1289
1290
1291
1292
1293 disable_irq(tsdata->client->irq);
1294
1295 gpiod_set_value_cansleep(reset_gpio, 1);
1296 usleep_range(1000, 2000);
1297
1298 ret = regulator_disable(tsdata->vcc);
1299 if (ret)
1300 dev_warn(dev, "Failed to disable vcc\n");
1301
1302 return 0;
1303}
1304
1305static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1306{
1307 struct i2c_client *client = to_i2c_client(dev);
1308 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1309 int ret = 0;
1310
1311 if (device_may_wakeup(dev))
1312 return 0;
1313
1314 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1315 return 0;
1316
1317 if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) {
1318 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328 gpiod_set_value_cansleep(reset_gpio, 1);
1329 usleep_range(5000, 6000);
1330
1331 ret = regulator_enable(tsdata->vcc);
1332 if (ret) {
1333 dev_err(dev, "Failed to enable vcc\n");
1334 return ret;
1335 }
1336
1337 usleep_range(1000, 2000);
1338 gpiod_set_value_cansleep(reset_gpio, 0);
1339 msleep(300);
1340
1341 edt_ft5x06_restore_reg_parameters(tsdata);
1342 enable_irq(tsdata->client->irq);
1343
1344 if (tsdata->factory_mode)
1345 ret = edt_ft5x06_factory_mode(tsdata);
1346 } else {
1347 struct gpio_desc *wake_gpio = tsdata->wake_gpio;
1348
1349 gpiod_set_value_cansleep(wake_gpio, 0);
1350 usleep_range(5000, 6000);
1351 gpiod_set_value_cansleep(wake_gpio, 1);
1352 }
1353
1354
1355 return ret;
1356}
1357
1358static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1359 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1360
1361static const struct edt_i2c_chip_data edt_ft5x06_data = {
1362 .max_support_points = 5,
1363};
1364
1365static const struct edt_i2c_chip_data edt_ft5506_data = {
1366 .max_support_points = 10,
1367};
1368
1369static const struct edt_i2c_chip_data edt_ft6236_data = {
1370 .max_support_points = 2,
1371};
1372
1373static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1374 { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
1375 { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
1376 { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data },
1377
1378 { .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
1379 { }
1380};
1381MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1382
1383static const struct of_device_id edt_ft5x06_of_match[] = {
1384 { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
1385 { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
1386 { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
1387 { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
1388 { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data },
1389
1390 { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
1391 { }
1392};
1393MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1394
1395static struct i2c_driver edt_ft5x06_ts_driver = {
1396 .driver = {
1397 .name = "edt_ft5x06",
1398 .of_match_table = edt_ft5x06_of_match,
1399 .pm = &edt_ft5x06_ts_pm_ops,
1400 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1401 },
1402 .id_table = edt_ft5x06_ts_id,
1403 .probe = edt_ft5x06_ts_probe,
1404 .remove = edt_ft5x06_ts_remove,
1405};
1406
1407module_i2c_driver(edt_ft5x06_ts_driver);
1408
1409MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1410MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1411MODULE_LICENSE("GPL v2");
1412
