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28#include <linux/module.h>
29#include <linux/ratelimit.h>
30#include <linux/irq.h>
31#include <linux/interrupt.h>
32#include <linux/input.h>
33#include <linux/i2c.h>
34#include <linux/uaccess.h>
35#include <linux/delay.h>
36#include <linux/debugfs.h>
37#include <linux/slab.h>
38#include <linux/gpio/consumer.h>
39#include <linux/input/mt.h>
40#include <linux/input/touchscreen.h>
41#include <linux/of_device.h>
42
43#define WORK_REGISTER_THRESHOLD 0x00
44#define WORK_REGISTER_REPORT_RATE 0x08
45#define WORK_REGISTER_GAIN 0x30
46#define WORK_REGISTER_OFFSET 0x31
47#define WORK_REGISTER_NUM_X 0x33
48#define WORK_REGISTER_NUM_Y 0x34
49
50#define M09_REGISTER_THRESHOLD 0x80
51#define M09_REGISTER_GAIN 0x92
52#define M09_REGISTER_OFFSET 0x93
53#define M09_REGISTER_NUM_X 0x94
54#define M09_REGISTER_NUM_Y 0x95
55
56#define NO_REGISTER 0xff
57
58#define WORK_REGISTER_OPMODE 0x3c
59#define FACTORY_REGISTER_OPMODE 0x01
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_ver {
73 M06,
74 M09,
75};
76
77struct edt_reg_addr {
78 int reg_threshold;
79 int reg_report_rate;
80 int reg_gain;
81 int reg_offset;
82 int reg_num_x;
83 int reg_num_y;
84};
85
86struct edt_ft5x06_ts_data {
87 struct i2c_client *client;
88 struct input_dev *input;
89 struct touchscreen_properties prop;
90 u16 num_x;
91 u16 num_y;
92
93 struct gpio_desc *reset_gpio;
94 struct gpio_desc *wake_gpio;
95
96#if defined(CONFIG_DEBUG_FS)
97 struct dentry *debug_dir;
98 u8 *raw_buffer;
99 size_t raw_bufsize;
100#endif
101
102 struct mutex mutex;
103 bool factory_mode;
104 int threshold;
105 int gain;
106 int offset;
107 int report_rate;
108 int max_support_points;
109
110 char name[EDT_NAME_LEN];
111
112 struct edt_reg_addr reg_addr;
113 enum edt_ver version;
114};
115
116struct edt_i2c_chip_data {
117 int max_support_points;
118};
119
120static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
121 u16 wr_len, u8 *wr_buf,
122 u16 rd_len, u8 *rd_buf)
123{
124 struct i2c_msg wrmsg[2];
125 int i = 0;
126 int ret;
127
128 if (wr_len) {
129 wrmsg[i].addr = client->addr;
130 wrmsg[i].flags = 0;
131 wrmsg[i].len = wr_len;
132 wrmsg[i].buf = wr_buf;
133 i++;
134 }
135 if (rd_len) {
136 wrmsg[i].addr = client->addr;
137 wrmsg[i].flags = I2C_M_RD;
138 wrmsg[i].len = rd_len;
139 wrmsg[i].buf = rd_buf;
140 i++;
141 }
142
143 ret = i2c_transfer(client->adapter, wrmsg, i);
144 if (ret < 0)
145 return ret;
146 if (ret != i)
147 return -EIO;
148
149 return 0;
150}
151
152static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
153 u8 *buf, int buflen)
154{
155 int i;
156 u8 crc = 0;
157
158 for (i = 0; i < buflen - 1; i++)
159 crc ^= buf[i];
160
161 if (crc != buf[buflen-1]) {
162 dev_err_ratelimited(&tsdata->client->dev,
163 "crc error: 0x%02x expected, got 0x%02x\n",
164 crc, buf[buflen-1]);
165 return false;
166 }
167
168 return true;
169}
170
171static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
172{
173 struct edt_ft5x06_ts_data *tsdata = dev_id;
174 struct device *dev = &tsdata->client->dev;
175 u8 cmd;
176 u8 rdbuf[63];
177 int i, type, x, y, id;
178 int offset, tplen, datalen, crclen;
179 int error;
180
181 switch (tsdata->version) {
182 case M06:
183 cmd = 0xf9;
184 offset = 5;
185 tplen = 4;
186 crclen = 1;
187 break;
188
189 case M09:
190 cmd = 0x0;
191 offset = 3;
192 tplen = 6;
193 crclen = 0;
194 break;
195
196 default:
197 goto out;
198 }
199
200 memset(rdbuf, 0, sizeof(rdbuf));
201 datalen = tplen * tsdata->max_support_points + offset + crclen;
202
203 error = edt_ft5x06_ts_readwrite(tsdata->client,
204 sizeof(cmd), &cmd,
205 datalen, rdbuf);
206 if (error) {
207 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
208 error);
209 goto out;
210 }
211
212
213 if (tsdata->version == M06) {
214 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
215 rdbuf[2] != datalen) {
216 dev_err_ratelimited(dev,
217 "Unexpected header: %02x%02x%02x!\n",
218 rdbuf[0], rdbuf[1], rdbuf[2]);
219 goto out;
220 }
221
222 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
223 goto out;
224 }
225
226 for (i = 0; i < tsdata->max_support_points; i++) {
227 u8 *buf = &rdbuf[i * tplen + offset];
228 bool down;
229
230 type = buf[0] >> 6;
231
232 if (type == TOUCH_EVENT_RESERVED)
233 continue;
234
235
236 if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
237 continue;
238
239 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
240 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
241 id = (buf[2] >> 4) & 0x0f;
242 down = type != TOUCH_EVENT_UP;
243
244 input_mt_slot(tsdata->input, id);
245 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
246
247 if (!down)
248 continue;
249
250 touchscreen_report_pos(tsdata->input, &tsdata->prop, x, y,
251 true);
252 }
253
254 input_mt_report_pointer_emulation(tsdata->input, true);
255 input_sync(tsdata->input);
256
257out:
258 return IRQ_HANDLED;
259}
260
261static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
262 u8 addr, u8 value)
263{
264 u8 wrbuf[4];
265
266 switch (tsdata->version) {
267 case M06:
268 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
269 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
270 wrbuf[2] = value;
271 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
272 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
273 wrbuf, 0, NULL);
274 case M09:
275 wrbuf[0] = addr;
276 wrbuf[1] = value;
277
278 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
279 wrbuf, 0, NULL);
280
281 default:
282 return -EINVAL;
283 }
284}
285
286static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
287 u8 addr)
288{
289 u8 wrbuf[2], rdbuf[2];
290 int error;
291
292 switch (tsdata->version) {
293 case M06:
294 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
295 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
296 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
297
298 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
299 rdbuf);
300 if (error)
301 return error;
302
303 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
304 dev_err(&tsdata->client->dev,
305 "crc error: 0x%02x expected, got 0x%02x\n",
306 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
307 rdbuf[1]);
308 return -EIO;
309 }
310 break;
311
312 case M09:
313 wrbuf[0] = addr;
314 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
315 wrbuf, 1, rdbuf);
316 if (error)
317 return error;
318 break;
319
320 default:
321 return -EINVAL;
322 }
323
324 return rdbuf[0];
325}
326
327struct edt_ft5x06_attribute {
328 struct device_attribute dattr;
329 size_t field_offset;
330 u8 limit_low;
331 u8 limit_high;
332 u8 addr_m06;
333 u8 addr_m09;
334};
335
336#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, \
337 _limit_low, _limit_high) \
338 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
339 .dattr = __ATTR(_field, _mode, \
340 edt_ft5x06_setting_show, \
341 edt_ft5x06_setting_store), \
342 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
343 .addr_m06 = _addr_m06, \
344 .addr_m09 = _addr_m09, \
345 .limit_low = _limit_low, \
346 .limit_high = _limit_high, \
347 }
348
349static ssize_t edt_ft5x06_setting_show(struct device *dev,
350 struct device_attribute *dattr,
351 char *buf)
352{
353 struct i2c_client *client = to_i2c_client(dev);
354 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
355 struct edt_ft5x06_attribute *attr =
356 container_of(dattr, struct edt_ft5x06_attribute, dattr);
357 u8 *field = (u8 *)tsdata + attr->field_offset;
358 int val;
359 size_t count = 0;
360 int error = 0;
361 u8 addr;
362
363 mutex_lock(&tsdata->mutex);
364
365 if (tsdata->factory_mode) {
366 error = -EIO;
367 goto out;
368 }
369
370 switch (tsdata->version) {
371 case M06:
372 addr = attr->addr_m06;
373 break;
374
375 case M09:
376 addr = attr->addr_m09;
377 break;
378
379 default:
380 error = -ENODEV;
381 goto out;
382 }
383
384 if (addr != NO_REGISTER) {
385 val = edt_ft5x06_register_read(tsdata, addr);
386 if (val < 0) {
387 error = val;
388 dev_err(&tsdata->client->dev,
389 "Failed to fetch attribute %s, error %d\n",
390 dattr->attr.name, error);
391 goto out;
392 }
393 } else {
394 val = *field;
395 }
396
397 if (val != *field) {
398 dev_warn(&tsdata->client->dev,
399 "%s: read (%d) and stored value (%d) differ\n",
400 dattr->attr.name, val, *field);
401 *field = val;
402 }
403
404 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
405out:
406 mutex_unlock(&tsdata->mutex);
407 return error ?: count;
408}
409
410static ssize_t edt_ft5x06_setting_store(struct device *dev,
411 struct device_attribute *dattr,
412 const char *buf, size_t count)
413{
414 struct i2c_client *client = to_i2c_client(dev);
415 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
416 struct edt_ft5x06_attribute *attr =
417 container_of(dattr, struct edt_ft5x06_attribute, dattr);
418 u8 *field = (u8 *)tsdata + attr->field_offset;
419 unsigned int val;
420 int error;
421 u8 addr;
422
423 mutex_lock(&tsdata->mutex);
424
425 if (tsdata->factory_mode) {
426 error = -EIO;
427 goto out;
428 }
429
430 error = kstrtouint(buf, 0, &val);
431 if (error)
432 goto out;
433
434 if (val < attr->limit_low || val > attr->limit_high) {
435 error = -ERANGE;
436 goto out;
437 }
438
439 switch (tsdata->version) {
440 case M06:
441 addr = attr->addr_m06;
442 break;
443
444 case M09:
445 addr = attr->addr_m09;
446 break;
447
448 default:
449 error = -ENODEV;
450 goto out;
451 }
452
453 if (addr != NO_REGISTER) {
454 error = edt_ft5x06_register_write(tsdata, addr, val);
455 if (error) {
456 dev_err(&tsdata->client->dev,
457 "Failed to update attribute %s, error: %d\n",
458 dattr->attr.name, error);
459 goto out;
460 }
461 }
462 *field = val;
463
464out:
465 mutex_unlock(&tsdata->mutex);
466 return error ?: count;
467}
468
469static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
470 M09_REGISTER_GAIN, 0, 31);
471static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
472 M09_REGISTER_OFFSET, 0, 31);
473static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
474 M09_REGISTER_THRESHOLD, 0, 80);
475static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
476 NO_REGISTER, 3, 14);
477
478static struct attribute *edt_ft5x06_attrs[] = {
479 &edt_ft5x06_attr_gain.dattr.attr,
480 &edt_ft5x06_attr_offset.dattr.attr,
481 &edt_ft5x06_attr_threshold.dattr.attr,
482 &edt_ft5x06_attr_report_rate.dattr.attr,
483 NULL
484};
485
486static const struct attribute_group edt_ft5x06_attr_group = {
487 .attrs = edt_ft5x06_attrs,
488};
489
490#ifdef CONFIG_DEBUG_FS
491static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
492{
493 struct i2c_client *client = tsdata->client;
494 int retries = EDT_SWITCH_MODE_RETRIES;
495 int ret;
496 int error;
497
498 disable_irq(client->irq);
499
500 if (!tsdata->raw_buffer) {
501 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
502 sizeof(u16);
503 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
504 if (!tsdata->raw_buffer) {
505 error = -ENOMEM;
506 goto err_out;
507 }
508 }
509
510
511 if (tsdata->version == M09)
512 goto m09_out;
513
514 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
515 if (error) {
516 dev_err(&client->dev,
517 "failed to switch to factory mode, error %d\n", error);
518 goto err_out;
519 }
520
521 tsdata->factory_mode = true;
522 do {
523 mdelay(EDT_SWITCH_MODE_DELAY);
524
525 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
526 if (ret == 0x03)
527 break;
528 } while (--retries > 0);
529
530 if (retries == 0) {
531 dev_err(&client->dev, "not in factory mode after %dms.\n",
532 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
533 error = -EIO;
534 goto err_out;
535 }
536
537 return 0;
538
539err_out:
540 kfree(tsdata->raw_buffer);
541 tsdata->raw_buffer = NULL;
542 tsdata->factory_mode = false;
543 enable_irq(client->irq);
544
545 return error;
546
547m09_out:
548 dev_err(&client->dev, "No factory mode support for M09\n");
549 return -EINVAL;
550
551}
552
553static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
554{
555 struct i2c_client *client = tsdata->client;
556 int retries = EDT_SWITCH_MODE_RETRIES;
557 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
558 int ret;
559 int error;
560
561
562 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
563 if (error) {
564 dev_err(&client->dev,
565 "failed to switch to work mode, error: %d\n", error);
566 return error;
567 }
568
569 tsdata->factory_mode = false;
570
571 do {
572 mdelay(EDT_SWITCH_MODE_DELAY);
573
574 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
575 if (ret == 0x01)
576 break;
577 } while (--retries > 0);
578
579 if (retries == 0) {
580 dev_err(&client->dev, "not in work mode after %dms.\n",
581 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
582 tsdata->factory_mode = true;
583 return -EIO;
584 }
585
586 kfree(tsdata->raw_buffer);
587 tsdata->raw_buffer = NULL;
588
589
590 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
591 tsdata->threshold);
592 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
593 tsdata->gain);
594 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
595 tsdata->offset);
596 if (reg_addr->reg_report_rate)
597 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
598 tsdata->report_rate);
599
600 enable_irq(client->irq);
601
602 return 0;
603}
604
605static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
606{
607 struct edt_ft5x06_ts_data *tsdata = data;
608
609 *mode = tsdata->factory_mode;
610
611 return 0;
612};
613
614static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
615{
616 struct edt_ft5x06_ts_data *tsdata = data;
617 int retval = 0;
618
619 if (mode > 1)
620 return -ERANGE;
621
622 mutex_lock(&tsdata->mutex);
623
624 if (mode != tsdata->factory_mode) {
625 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
626 edt_ft5x06_work_mode(tsdata);
627 }
628
629 mutex_unlock(&tsdata->mutex);
630
631 return retval;
632};
633
634DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
635 edt_ft5x06_debugfs_mode_set, "%llu\n");
636
637static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
638 char __user *buf, size_t count, loff_t *off)
639{
640 struct edt_ft5x06_ts_data *tsdata = file->private_data;
641 struct i2c_client *client = tsdata->client;
642 int retries = EDT_RAW_DATA_RETRIES;
643 int val, i, error;
644 size_t read = 0;
645 int colbytes;
646 char wrbuf[3];
647 u8 *rdbuf;
648
649 if (*off < 0 || *off >= tsdata->raw_bufsize)
650 return 0;
651
652 mutex_lock(&tsdata->mutex);
653
654 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
655 error = -EIO;
656 goto out;
657 }
658
659 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
660 if (error) {
661 dev_dbg(&client->dev,
662 "failed to write 0x08 register, error %d\n", error);
663 goto out;
664 }
665
666 do {
667 usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
668 val = edt_ft5x06_register_read(tsdata, 0x08);
669 if (val < 1)
670 break;
671 } while (--retries > 0);
672
673 if (val < 0) {
674 error = val;
675 dev_dbg(&client->dev,
676 "failed to read 0x08 register, error %d\n", error);
677 goto out;
678 }
679
680 if (retries == 0) {
681 dev_dbg(&client->dev,
682 "timed out waiting for register to settle\n");
683 error = -ETIMEDOUT;
684 goto out;
685 }
686
687 rdbuf = tsdata->raw_buffer;
688 colbytes = tsdata->num_y * sizeof(u16);
689
690 wrbuf[0] = 0xf5;
691 wrbuf[1] = 0x0e;
692 for (i = 0; i < tsdata->num_x; i++) {
693 wrbuf[2] = i;
694 error = edt_ft5x06_ts_readwrite(tsdata->client,
695 sizeof(wrbuf), wrbuf,
696 colbytes, rdbuf);
697 if (error)
698 goto out;
699
700 rdbuf += colbytes;
701 }
702
703 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
704 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
705 error = -EFAULT;
706 goto out;
707 }
708
709 *off += read;
710out:
711 mutex_unlock(&tsdata->mutex);
712 return error ?: read;
713};
714
715static const struct file_operations debugfs_raw_data_fops = {
716 .open = simple_open,
717 .read = edt_ft5x06_debugfs_raw_data_read,
718};
719
720static void
721edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
722 const char *debugfs_name)
723{
724 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
725 if (!tsdata->debug_dir)
726 return;
727
728 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
729 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
730
731 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
732 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
733 debugfs_create_file("raw_data", S_IRUSR,
734 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
735}
736
737static void
738edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
739{
740 debugfs_remove_recursive(tsdata->debug_dir);
741 kfree(tsdata->raw_buffer);
742}
743
744#else
745
746static inline void
747edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
748 const char *debugfs_name)
749{
750}
751
752static inline void
753edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
754{
755}
756
757#endif
758
759static int edt_ft5x06_ts_identify(struct i2c_client *client,
760 struct edt_ft5x06_ts_data *tsdata,
761 char *fw_version)
762{
763 u8 rdbuf[EDT_NAME_LEN];
764 char *p;
765 int error;
766 char *model_name = tsdata->name;
767
768
769
770
771
772 memset(rdbuf, 0, sizeof(rdbuf));
773 error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
774 EDT_NAME_LEN - 1, rdbuf);
775 if (error)
776 return error;
777
778
779
780
781 if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
782 tsdata->version = M06;
783
784
785 rdbuf[EDT_NAME_LEN - 1] = '\0';
786 if (rdbuf[EDT_NAME_LEN - 2] == '$')
787 rdbuf[EDT_NAME_LEN - 2] = '\0';
788
789
790 p = strchr(rdbuf, '*');
791 if (p)
792 *p++ = '\0';
793 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
794 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
795 } else {
796
797 tsdata->version = M09;
798
799 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
800 2, rdbuf);
801 if (error)
802 return error;
803
804 strlcpy(fw_version, rdbuf, 2);
805
806 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
807 1, rdbuf);
808 if (error)
809 return error;
810
811 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
812 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
813 }
814
815 return 0;
816}
817
818static void edt_ft5x06_ts_get_defaults(struct device *dev,
819 struct edt_ft5x06_ts_data *tsdata)
820{
821 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
822 u32 val;
823 int error;
824
825 error = device_property_read_u32(dev, "threshold", &val);
826 if (!error) {
827 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val);
828 tsdata->threshold = val;
829 }
830
831 error = device_property_read_u32(dev, "gain", &val);
832 if (!error) {
833 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val);
834 tsdata->gain = val;
835 }
836
837 error = device_property_read_u32(dev, "offset", &val);
838 if (!error) {
839 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, val);
840 tsdata->offset = val;
841 }
842}
843
844static void
845edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
846{
847 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
848
849 tsdata->threshold = edt_ft5x06_register_read(tsdata,
850 reg_addr->reg_threshold);
851 tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
852 tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
853 if (reg_addr->reg_report_rate != NO_REGISTER)
854 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
855 reg_addr->reg_report_rate);
856 tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
857 tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
858}
859
860static void
861edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
862{
863 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
864
865 switch (tsdata->version) {
866 case M06:
867 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
868 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
869 reg_addr->reg_gain = WORK_REGISTER_GAIN;
870 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
871 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
872 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
873 break;
874
875 case M09:
876 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
877 reg_addr->reg_gain = M09_REGISTER_GAIN;
878 reg_addr->reg_offset = M09_REGISTER_OFFSET;
879 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
880 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
881 break;
882 }
883}
884
885static int edt_ft5x06_ts_probe(struct i2c_client *client,
886 const struct i2c_device_id *id)
887{
888 const struct edt_i2c_chip_data *chip_data;
889 struct edt_ft5x06_ts_data *tsdata;
890 struct input_dev *input;
891 unsigned long irq_flags;
892 int error;
893 char fw_version[EDT_NAME_LEN];
894
895 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
896
897 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
898 if (!tsdata) {
899 dev_err(&client->dev, "failed to allocate driver data.\n");
900 return -ENOMEM;
901 }
902
903 chip_data = of_device_get_match_data(&client->dev);
904 if (!chip_data)
905 chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
906 if (!chip_data || !chip_data->max_support_points) {
907 dev_err(&client->dev, "invalid or missing chip data\n");
908 return -EINVAL;
909 }
910
911 tsdata->max_support_points = chip_data->max_support_points;
912
913 tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
914 "reset", GPIOD_OUT_HIGH);
915 if (IS_ERR(tsdata->reset_gpio)) {
916 error = PTR_ERR(tsdata->reset_gpio);
917 dev_err(&client->dev,
918 "Failed to request GPIO reset pin, error %d\n", error);
919 return error;
920 }
921
922 tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
923 "wake", GPIOD_OUT_LOW);
924 if (IS_ERR(tsdata->wake_gpio)) {
925 error = PTR_ERR(tsdata->wake_gpio);
926 dev_err(&client->dev,
927 "Failed to request GPIO wake pin, error %d\n", error);
928 return error;
929 }
930
931 if (tsdata->wake_gpio) {
932 usleep_range(5000, 6000);
933 gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
934 }
935
936 if (tsdata->reset_gpio) {
937 usleep_range(5000, 6000);
938 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
939 msleep(300);
940 }
941
942 input = devm_input_allocate_device(&client->dev);
943 if (!input) {
944 dev_err(&client->dev, "failed to allocate input device.\n");
945 return -ENOMEM;
946 }
947
948 mutex_init(&tsdata->mutex);
949 tsdata->client = client;
950 tsdata->input = input;
951 tsdata->factory_mode = false;
952
953 error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
954 if (error) {
955 dev_err(&client->dev, "touchscreen probe failed\n");
956 return error;
957 }
958
959 edt_ft5x06_ts_set_regs(tsdata);
960 edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
961 edt_ft5x06_ts_get_parameters(tsdata);
962
963 dev_dbg(&client->dev,
964 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
965 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
966
967 input->name = tsdata->name;
968 input->id.bustype = BUS_I2C;
969 input->dev.parent = &client->dev;
970
971 input_set_abs_params(input, ABS_MT_POSITION_X,
972 0, tsdata->num_x * 64 - 1, 0, 0);
973 input_set_abs_params(input, ABS_MT_POSITION_Y,
974 0, tsdata->num_y * 64 - 1, 0, 0);
975
976 touchscreen_parse_properties(input, true, &tsdata->prop);
977
978 error = input_mt_init_slots(input, tsdata->max_support_points,
979 INPUT_MT_DIRECT);
980 if (error) {
981 dev_err(&client->dev, "Unable to init MT slots.\n");
982 return error;
983 }
984
985 i2c_set_clientdata(client, tsdata);
986
987 irq_flags = irq_get_trigger_type(client->irq);
988 if (irq_flags == IRQF_TRIGGER_NONE)
989 irq_flags = IRQF_TRIGGER_FALLING;
990 irq_flags |= IRQF_ONESHOT;
991
992 error = devm_request_threaded_irq(&client->dev, client->irq,
993 NULL, edt_ft5x06_ts_isr, irq_flags,
994 client->name, tsdata);
995 if (error) {
996 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
997 return error;
998 }
999
1000 error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1001 if (error)
1002 return error;
1003
1004 error = input_register_device(input);
1005 if (error)
1006 goto err_remove_attrs;
1007
1008 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1009 device_init_wakeup(&client->dev, 1);
1010
1011 dev_dbg(&client->dev,
1012 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1013 client->irq,
1014 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
1015 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
1016
1017 return 0;
1018
1019err_remove_attrs:
1020 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1021 return error;
1022}
1023
1024static int edt_ft5x06_ts_remove(struct i2c_client *client)
1025{
1026 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1027
1028 edt_ft5x06_ts_teardown_debugfs(tsdata);
1029 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1030
1031 return 0;
1032}
1033
1034static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
1035{
1036 struct i2c_client *client = to_i2c_client(dev);
1037
1038 if (device_may_wakeup(dev))
1039 enable_irq_wake(client->irq);
1040
1041 return 0;
1042}
1043
1044static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
1045{
1046 struct i2c_client *client = to_i2c_client(dev);
1047
1048 if (device_may_wakeup(dev))
1049 disable_irq_wake(client->irq);
1050
1051 return 0;
1052}
1053
1054static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1055 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1056
1057static const struct edt_i2c_chip_data edt_ft5x06_data = {
1058 .max_support_points = 5,
1059};
1060
1061static const struct edt_i2c_chip_data edt_ft5506_data = {
1062 .max_support_points = 10,
1063};
1064
1065static const struct edt_i2c_chip_data edt_ft6236_data = {
1066 .max_support_points = 2,
1067};
1068
1069static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1070 { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
1071 { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
1072
1073 { .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
1074 { }
1075};
1076MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1077
1078#ifdef CONFIG_OF
1079static const struct of_device_id edt_ft5x06_of_match[] = {
1080 { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
1081 { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
1082 { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
1083 { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
1084
1085 { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
1086 { }
1087};
1088MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1089#endif
1090
1091static struct i2c_driver edt_ft5x06_ts_driver = {
1092 .driver = {
1093 .name = "edt_ft5x06",
1094 .of_match_table = of_match_ptr(edt_ft5x06_of_match),
1095 .pm = &edt_ft5x06_ts_pm_ops,
1096 },
1097 .id_table = edt_ft5x06_ts_id,
1098 .probe = edt_ft5x06_ts_probe,
1099 .remove = edt_ft5x06_ts_remove,
1100};
1101
1102module_i2c_driver(edt_ft5x06_ts_driver);
1103
1104MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1105MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1106MODULE_LICENSE("GPL");
1107
