Loading...
1/*
2 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
3 * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
4 * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20/*
21 * This is a driver for the EDT "Polytouch" family of touch controllers
22 * based on the FocalTech FT5x06 line of chips.
23 *
24 * Development of this driver has been sponsored by Glyn:
25 * http://www.glyn.com/Products/Displays
26 */
27
28#include <linux/module.h>
29#include <linux/ratelimit.h>
30#include <linux/interrupt.h>
31#include <linux/input.h>
32#include <linux/i2c.h>
33#include <linux/uaccess.h>
34#include <linux/delay.h>
35#include <linux/debugfs.h>
36#include <linux/slab.h>
37#include <linux/gpio.h>
38#include <linux/of_gpio.h>
39#include <linux/input/mt.h>
40#include <linux/input/edt-ft5x06.h>
41
42#define MAX_SUPPORT_POINTS 5
43
44#define WORK_REGISTER_THRESHOLD 0x00
45#define WORK_REGISTER_REPORT_RATE 0x08
46#define WORK_REGISTER_GAIN 0x30
47#define WORK_REGISTER_OFFSET 0x31
48#define WORK_REGISTER_NUM_X 0x33
49#define WORK_REGISTER_NUM_Y 0x34
50
51#define M09_REGISTER_THRESHOLD 0x80
52#define M09_REGISTER_GAIN 0x92
53#define M09_REGISTER_OFFSET 0x93
54#define M09_REGISTER_NUM_X 0x94
55#define M09_REGISTER_NUM_Y 0x95
56
57#define NO_REGISTER 0xff
58
59#define WORK_REGISTER_OPMODE 0x3c
60#define FACTORY_REGISTER_OPMODE 0x01
61
62#define TOUCH_EVENT_DOWN 0x00
63#define TOUCH_EVENT_UP 0x01
64#define TOUCH_EVENT_ON 0x02
65#define TOUCH_EVENT_RESERVED 0x03
66
67#define EDT_NAME_LEN 23
68#define EDT_SWITCH_MODE_RETRIES 10
69#define EDT_SWITCH_MODE_DELAY 5 /* msec */
70#define EDT_RAW_DATA_RETRIES 100
71#define EDT_RAW_DATA_DELAY 1 /* msec */
72
73enum edt_ver {
74 M06,
75 M09,
76};
77
78struct edt_reg_addr {
79 int reg_threshold;
80 int reg_report_rate;
81 int reg_gain;
82 int reg_offset;
83 int reg_num_x;
84 int reg_num_y;
85};
86
87struct edt_ft5x06_ts_data {
88 struct i2c_client *client;
89 struct input_dev *input;
90 u16 num_x;
91 u16 num_y;
92
93 int reset_pin;
94 int irq_pin;
95 int wake_pin;
96
97#if defined(CONFIG_DEBUG_FS)
98 struct dentry *debug_dir;
99 u8 *raw_buffer;
100 size_t raw_bufsize;
101#endif
102
103 struct mutex mutex;
104 bool factory_mode;
105 int threshold;
106 int gain;
107 int offset;
108 int report_rate;
109
110 char name[EDT_NAME_LEN];
111
112 struct edt_reg_addr reg_addr;
113 enum edt_ver version;
114};
115
116static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
117 u16 wr_len, u8 *wr_buf,
118 u16 rd_len, u8 *rd_buf)
119{
120 struct i2c_msg wrmsg[2];
121 int i = 0;
122 int ret;
123
124 if (wr_len) {
125 wrmsg[i].addr = client->addr;
126 wrmsg[i].flags = 0;
127 wrmsg[i].len = wr_len;
128 wrmsg[i].buf = wr_buf;
129 i++;
130 }
131 if (rd_len) {
132 wrmsg[i].addr = client->addr;
133 wrmsg[i].flags = I2C_M_RD;
134 wrmsg[i].len = rd_len;
135 wrmsg[i].buf = rd_buf;
136 i++;
137 }
138
139 ret = i2c_transfer(client->adapter, wrmsg, i);
140 if (ret < 0)
141 return ret;
142 if (ret != i)
143 return -EIO;
144
145 return 0;
146}
147
148static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
149 u8 *buf, int buflen)
150{
151 int i;
152 u8 crc = 0;
153
154 for (i = 0; i < buflen - 1; i++)
155 crc ^= buf[i];
156
157 if (crc != buf[buflen-1]) {
158 dev_err_ratelimited(&tsdata->client->dev,
159 "crc error: 0x%02x expected, got 0x%02x\n",
160 crc, buf[buflen-1]);
161 return false;
162 }
163
164 return true;
165}
166
167static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
168{
169 struct edt_ft5x06_ts_data *tsdata = dev_id;
170 struct device *dev = &tsdata->client->dev;
171 u8 cmd;
172 u8 rdbuf[29];
173 int i, type, x, y, id;
174 int offset, tplen, datalen;
175 int error;
176
177 switch (tsdata->version) {
178 case M06:
179 cmd = 0xf9; /* tell the controller to send touch data */
180 offset = 5; /* where the actual touch data starts */
181 tplen = 4; /* data comes in so called frames */
182 datalen = 26; /* how much bytes to listen for */
183 break;
184
185 case M09:
186 cmd = 0x02;
187 offset = 1;
188 tplen = 6;
189 datalen = 29;
190 break;
191
192 default:
193 goto out;
194 }
195
196 memset(rdbuf, 0, sizeof(rdbuf));
197
198 error = edt_ft5x06_ts_readwrite(tsdata->client,
199 sizeof(cmd), &cmd,
200 datalen, rdbuf);
201 if (error) {
202 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
203 error);
204 goto out;
205 }
206
207 /* M09 does not send header or CRC */
208 if (tsdata->version == M06) {
209 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
210 rdbuf[2] != datalen) {
211 dev_err_ratelimited(dev,
212 "Unexpected header: %02x%02x%02x!\n",
213 rdbuf[0], rdbuf[1], rdbuf[2]);
214 goto out;
215 }
216
217 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
218 goto out;
219 }
220
221 for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
222 u8 *buf = &rdbuf[i * tplen + offset];
223 bool down;
224
225 type = buf[0] >> 6;
226 /* ignore Reserved events */
227 if (type == TOUCH_EVENT_RESERVED)
228 continue;
229
230 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
231 if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
232 continue;
233
234 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
235 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
236 id = (buf[2] >> 4) & 0x0f;
237 down = type != TOUCH_EVENT_UP;
238
239 input_mt_slot(tsdata->input, id);
240 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
241
242 if (!down)
243 continue;
244
245 input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
246 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
247 }
248
249 input_mt_report_pointer_emulation(tsdata->input, true);
250 input_sync(tsdata->input);
251
252out:
253 return IRQ_HANDLED;
254}
255
256static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
257 u8 addr, u8 value)
258{
259 u8 wrbuf[4];
260
261 switch (tsdata->version) {
262 case M06:
263 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
264 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
265 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
266 wrbuf[2] = value;
267 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
268 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
269 wrbuf, 0, NULL);
270 case M09:
271 wrbuf[0] = addr;
272 wrbuf[1] = value;
273
274 return edt_ft5x06_ts_readwrite(tsdata->client, 3,
275 wrbuf, 0, NULL);
276
277 default:
278 return -EINVAL;
279 }
280}
281
282static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
283 u8 addr)
284{
285 u8 wrbuf[2], rdbuf[2];
286 int error;
287
288 switch (tsdata->version) {
289 case M06:
290 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
291 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
292 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
293
294 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
295 rdbuf);
296 if (error)
297 return error;
298
299 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
300 dev_err(&tsdata->client->dev,
301 "crc error: 0x%02x expected, got 0x%02x\n",
302 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
303 rdbuf[1]);
304 return -EIO;
305 }
306 break;
307
308 case M09:
309 wrbuf[0] = addr;
310 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
311 wrbuf, 1, rdbuf);
312 if (error)
313 return error;
314 break;
315
316 default:
317 return -EINVAL;
318 }
319
320 return rdbuf[0];
321}
322
323struct edt_ft5x06_attribute {
324 struct device_attribute dattr;
325 size_t field_offset;
326 u8 limit_low;
327 u8 limit_high;
328 u8 addr_m06;
329 u8 addr_m09;
330};
331
332#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, \
333 _limit_low, _limit_high) \
334 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
335 .dattr = __ATTR(_field, _mode, \
336 edt_ft5x06_setting_show, \
337 edt_ft5x06_setting_store), \
338 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
339 .addr_m06 = _addr_m06, \
340 .addr_m09 = _addr_m09, \
341 .limit_low = _limit_low, \
342 .limit_high = _limit_high, \
343 }
344
345static ssize_t edt_ft5x06_setting_show(struct device *dev,
346 struct device_attribute *dattr,
347 char *buf)
348{
349 struct i2c_client *client = to_i2c_client(dev);
350 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
351 struct edt_ft5x06_attribute *attr =
352 container_of(dattr, struct edt_ft5x06_attribute, dattr);
353 u8 *field = (u8 *)tsdata + attr->field_offset;
354 int val;
355 size_t count = 0;
356 int error = 0;
357 u8 addr;
358
359 mutex_lock(&tsdata->mutex);
360
361 if (tsdata->factory_mode) {
362 error = -EIO;
363 goto out;
364 }
365
366 switch (tsdata->version) {
367 case M06:
368 addr = attr->addr_m06;
369 break;
370
371 case M09:
372 addr = attr->addr_m09;
373 break;
374
375 default:
376 error = -ENODEV;
377 goto out;
378 }
379
380 if (addr != NO_REGISTER) {
381 val = edt_ft5x06_register_read(tsdata, addr);
382 if (val < 0) {
383 error = val;
384 dev_err(&tsdata->client->dev,
385 "Failed to fetch attribute %s, error %d\n",
386 dattr->attr.name, error);
387 goto out;
388 }
389 } else {
390 val = *field;
391 }
392
393 if (val != *field) {
394 dev_warn(&tsdata->client->dev,
395 "%s: read (%d) and stored value (%d) differ\n",
396 dattr->attr.name, val, *field);
397 *field = val;
398 }
399
400 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
401out:
402 mutex_unlock(&tsdata->mutex);
403 return error ?: count;
404}
405
406static ssize_t edt_ft5x06_setting_store(struct device *dev,
407 struct device_attribute *dattr,
408 const char *buf, size_t count)
409{
410 struct i2c_client *client = to_i2c_client(dev);
411 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
412 struct edt_ft5x06_attribute *attr =
413 container_of(dattr, struct edt_ft5x06_attribute, dattr);
414 u8 *field = (u8 *)tsdata + attr->field_offset;
415 unsigned int val;
416 int error;
417 u8 addr;
418
419 mutex_lock(&tsdata->mutex);
420
421 if (tsdata->factory_mode) {
422 error = -EIO;
423 goto out;
424 }
425
426 error = kstrtouint(buf, 0, &val);
427 if (error)
428 goto out;
429
430 if (val < attr->limit_low || val > attr->limit_high) {
431 error = -ERANGE;
432 goto out;
433 }
434
435 switch (tsdata->version) {
436 case M06:
437 addr = attr->addr_m06;
438 break;
439
440 case M09:
441 addr = attr->addr_m09;
442 break;
443
444 default:
445 error = -ENODEV;
446 goto out;
447 }
448
449 if (addr != NO_REGISTER) {
450 error = edt_ft5x06_register_write(tsdata, addr, val);
451 if (error) {
452 dev_err(&tsdata->client->dev,
453 "Failed to update attribute %s, error: %d\n",
454 dattr->attr.name, error);
455 goto out;
456 }
457 }
458 *field = val;
459
460out:
461 mutex_unlock(&tsdata->mutex);
462 return error ?: count;
463}
464
465static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
466 M09_REGISTER_GAIN, 0, 31);
467static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
468 M09_REGISTER_OFFSET, 0, 31);
469static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
470 M09_REGISTER_THRESHOLD, 20, 80);
471static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
472 NO_REGISTER, 3, 14);
473
474static struct attribute *edt_ft5x06_attrs[] = {
475 &edt_ft5x06_attr_gain.dattr.attr,
476 &edt_ft5x06_attr_offset.dattr.attr,
477 &edt_ft5x06_attr_threshold.dattr.attr,
478 &edt_ft5x06_attr_report_rate.dattr.attr,
479 NULL
480};
481
482static const struct attribute_group edt_ft5x06_attr_group = {
483 .attrs = edt_ft5x06_attrs,
484};
485
486#ifdef CONFIG_DEBUG_FS
487static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
488{
489 struct i2c_client *client = tsdata->client;
490 int retries = EDT_SWITCH_MODE_RETRIES;
491 int ret;
492 int error;
493
494 disable_irq(client->irq);
495
496 if (!tsdata->raw_buffer) {
497 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
498 sizeof(u16);
499 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
500 if (!tsdata->raw_buffer) {
501 error = -ENOMEM;
502 goto err_out;
503 }
504 }
505
506 /* mode register is 0x3c when in the work mode */
507 if (tsdata->version == M09)
508 goto m09_out;
509
510 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
511 if (error) {
512 dev_err(&client->dev,
513 "failed to switch to factory mode, error %d\n", error);
514 goto err_out;
515 }
516
517 tsdata->factory_mode = true;
518 do {
519 mdelay(EDT_SWITCH_MODE_DELAY);
520 /* mode register is 0x01 when in factory mode */
521 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
522 if (ret == 0x03)
523 break;
524 } while (--retries > 0);
525
526 if (retries == 0) {
527 dev_err(&client->dev, "not in factory mode after %dms.\n",
528 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
529 error = -EIO;
530 goto err_out;
531 }
532
533 return 0;
534
535err_out:
536 kfree(tsdata->raw_buffer);
537 tsdata->raw_buffer = NULL;
538 tsdata->factory_mode = false;
539 enable_irq(client->irq);
540
541 return error;
542
543m09_out:
544 dev_err(&client->dev, "No factory mode support for M09\n");
545 return -EINVAL;
546
547}
548
549static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
550{
551 struct i2c_client *client = tsdata->client;
552 int retries = EDT_SWITCH_MODE_RETRIES;
553 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
554 int ret;
555 int error;
556
557 /* mode register is 0x01 when in the factory mode */
558 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
559 if (error) {
560 dev_err(&client->dev,
561 "failed to switch to work mode, error: %d\n", error);
562 return error;
563 }
564
565 tsdata->factory_mode = false;
566
567 do {
568 mdelay(EDT_SWITCH_MODE_DELAY);
569 /* mode register is 0x01 when in factory mode */
570 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
571 if (ret == 0x01)
572 break;
573 } while (--retries > 0);
574
575 if (retries == 0) {
576 dev_err(&client->dev, "not in work mode after %dms.\n",
577 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
578 tsdata->factory_mode = true;
579 return -EIO;
580 }
581
582 kfree(tsdata->raw_buffer);
583 tsdata->raw_buffer = NULL;
584
585 /* restore parameters */
586 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
587 tsdata->threshold);
588 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
589 tsdata->gain);
590 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
591 tsdata->offset);
592 if (reg_addr->reg_report_rate)
593 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
594 tsdata->report_rate);
595
596 enable_irq(client->irq);
597
598 return 0;
599}
600
601static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
602{
603 struct edt_ft5x06_ts_data *tsdata = data;
604
605 *mode = tsdata->factory_mode;
606
607 return 0;
608};
609
610static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
611{
612 struct edt_ft5x06_ts_data *tsdata = data;
613 int retval = 0;
614
615 if (mode > 1)
616 return -ERANGE;
617
618 mutex_lock(&tsdata->mutex);
619
620 if (mode != tsdata->factory_mode) {
621 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
622 edt_ft5x06_work_mode(tsdata);
623 }
624
625 mutex_unlock(&tsdata->mutex);
626
627 return retval;
628};
629
630DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
631 edt_ft5x06_debugfs_mode_set, "%llu\n");
632
633static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
634 char __user *buf, size_t count, loff_t *off)
635{
636 struct edt_ft5x06_ts_data *tsdata = file->private_data;
637 struct i2c_client *client = tsdata->client;
638 int retries = EDT_RAW_DATA_RETRIES;
639 int val, i, error;
640 size_t read = 0;
641 int colbytes;
642 char wrbuf[3];
643 u8 *rdbuf;
644
645 if (*off < 0 || *off >= tsdata->raw_bufsize)
646 return 0;
647
648 mutex_lock(&tsdata->mutex);
649
650 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
651 error = -EIO;
652 goto out;
653 }
654
655 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
656 if (error) {
657 dev_dbg(&client->dev,
658 "failed to write 0x08 register, error %d\n", error);
659 goto out;
660 }
661
662 do {
663 msleep(EDT_RAW_DATA_DELAY);
664 val = edt_ft5x06_register_read(tsdata, 0x08);
665 if (val < 1)
666 break;
667 } while (--retries > 0);
668
669 if (val < 0) {
670 error = val;
671 dev_dbg(&client->dev,
672 "failed to read 0x08 register, error %d\n", error);
673 goto out;
674 }
675
676 if (retries == 0) {
677 dev_dbg(&client->dev,
678 "timed out waiting for register to settle\n");
679 error = -ETIMEDOUT;
680 goto out;
681 }
682
683 rdbuf = tsdata->raw_buffer;
684 colbytes = tsdata->num_y * sizeof(u16);
685
686 wrbuf[0] = 0xf5;
687 wrbuf[1] = 0x0e;
688 for (i = 0; i < tsdata->num_x; i++) {
689 wrbuf[2] = i; /* column index */
690 error = edt_ft5x06_ts_readwrite(tsdata->client,
691 sizeof(wrbuf), wrbuf,
692 colbytes, rdbuf);
693 if (error)
694 goto out;
695
696 rdbuf += colbytes;
697 }
698
699 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
700 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
701 error = -EFAULT;
702 goto out;
703 }
704
705 *off += read;
706out:
707 mutex_unlock(&tsdata->mutex);
708 return error ?: read;
709};
710
711static const struct file_operations debugfs_raw_data_fops = {
712 .open = simple_open,
713 .read = edt_ft5x06_debugfs_raw_data_read,
714};
715
716static void
717edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
718 const char *debugfs_name)
719{
720 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
721 if (!tsdata->debug_dir)
722 return;
723
724 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
725 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
726
727 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
728 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
729 debugfs_create_file("raw_data", S_IRUSR,
730 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
731}
732
733static void
734edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
735{
736 if (tsdata->debug_dir)
737 debugfs_remove_recursive(tsdata->debug_dir);
738 kfree(tsdata->raw_buffer);
739}
740
741#else
742
743static inline void
744edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
745 const char *debugfs_name)
746{
747}
748
749static inline void
750edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
751{
752}
753
754#endif /* CONFIG_DEBUGFS */
755
756static int edt_ft5x06_ts_reset(struct i2c_client *client,
757 struct edt_ft5x06_ts_data *tsdata)
758{
759 int error;
760
761 if (gpio_is_valid(tsdata->wake_pin)) {
762 error = devm_gpio_request_one(&client->dev,
763 tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
764 "edt-ft5x06 wake");
765 if (error) {
766 dev_err(&client->dev,
767 "Failed to request GPIO %d as wake pin, error %d\n",
768 tsdata->wake_pin, error);
769 return error;
770 }
771
772 msleep(5);
773 gpio_set_value(tsdata->wake_pin, 1);
774 }
775 if (gpio_is_valid(tsdata->reset_pin)) {
776 /* this pulls reset down, enabling the low active reset */
777 error = devm_gpio_request_one(&client->dev,
778 tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
779 "edt-ft5x06 reset");
780 if (error) {
781 dev_err(&client->dev,
782 "Failed to request GPIO %d as reset pin, error %d\n",
783 tsdata->reset_pin, error);
784 return error;
785 }
786
787 msleep(5);
788 gpio_set_value(tsdata->reset_pin, 1);
789 msleep(300);
790 }
791
792 return 0;
793}
794
795static int edt_ft5x06_ts_identify(struct i2c_client *client,
796 struct edt_ft5x06_ts_data *tsdata,
797 char *fw_version)
798{
799 u8 rdbuf[EDT_NAME_LEN];
800 char *p;
801 int error;
802 char *model_name = tsdata->name;
803
804 /* see what we find if we assume it is a M06 *
805 * if we get less than EDT_NAME_LEN, we don't want
806 * to have garbage in there
807 */
808 memset(rdbuf, 0, sizeof(rdbuf));
809 error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
810 EDT_NAME_LEN - 1, rdbuf);
811 if (error)
812 return error;
813
814 /* if we find something consistent, stay with that assumption
815 * at least M09 won't send 3 bytes here
816 */
817 if (!(strnicmp(rdbuf + 1, "EP0", 3))) {
818 tsdata->version = M06;
819
820 /* remove last '$' end marker */
821 rdbuf[EDT_NAME_LEN - 1] = '\0';
822 if (rdbuf[EDT_NAME_LEN - 2] == '$')
823 rdbuf[EDT_NAME_LEN - 2] = '\0';
824
825 /* look for Model/Version separator */
826 p = strchr(rdbuf, '*');
827 if (p)
828 *p++ = '\0';
829 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
830 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
831 } else {
832 /* since there are only two versions around (M06, M09) */
833 tsdata->version = M09;
834
835 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
836 2, rdbuf);
837 if (error)
838 return error;
839
840 strlcpy(fw_version, rdbuf, 2);
841
842 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
843 1, rdbuf);
844 if (error)
845 return error;
846
847 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
848 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
849 }
850
851 return 0;
852}
853
854#define EDT_ATTR_CHECKSET(name, reg) \
855 if (pdata->name >= edt_ft5x06_attr_##name.limit_low && \
856 pdata->name <= edt_ft5x06_attr_##name.limit_high) \
857 edt_ft5x06_register_write(tsdata, reg, pdata->name)
858
859#define EDT_GET_PROP(name, reg) { \
860 u32 val; \
861 if (of_property_read_u32(np, #name, &val) == 0) \
862 edt_ft5x06_register_write(tsdata, reg, val); \
863}
864
865static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
866 struct edt_ft5x06_ts_data *tsdata)
867{
868 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
869
870 EDT_GET_PROP(threshold, reg_addr->reg_threshold);
871 EDT_GET_PROP(gain, reg_addr->reg_gain);
872 EDT_GET_PROP(offset, reg_addr->reg_offset);
873}
874
875static void
876edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
877 const struct edt_ft5x06_platform_data *pdata)
878{
879 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
880
881 if (!pdata->use_parameters)
882 return;
883
884 /* pick up defaults from the platform data */
885 EDT_ATTR_CHECKSET(threshold, reg_addr->reg_threshold);
886 EDT_ATTR_CHECKSET(gain, reg_addr->reg_gain);
887 EDT_ATTR_CHECKSET(offset, reg_addr->reg_offset);
888 if (reg_addr->reg_report_rate != NO_REGISTER)
889 EDT_ATTR_CHECKSET(report_rate, reg_addr->reg_report_rate);
890}
891
892static void
893edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
894{
895 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
896
897 tsdata->threshold = edt_ft5x06_register_read(tsdata,
898 reg_addr->reg_threshold);
899 tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
900 tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
901 if (reg_addr->reg_report_rate != NO_REGISTER)
902 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
903 reg_addr->reg_report_rate);
904 tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
905 tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
906}
907
908static void
909edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
910{
911 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
912
913 switch (tsdata->version) {
914 case M06:
915 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
916 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
917 reg_addr->reg_gain = WORK_REGISTER_GAIN;
918 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
919 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
920 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
921 break;
922
923 case M09:
924 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
925 reg_addr->reg_gain = M09_REGISTER_GAIN;
926 reg_addr->reg_offset = M09_REGISTER_OFFSET;
927 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
928 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
929 break;
930 }
931}
932
933#ifdef CONFIG_OF
934static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
935 struct edt_ft5x06_ts_data *tsdata)
936{
937 struct device_node *np = dev->of_node;
938
939 /*
940 * irq_pin is not needed for DT setup.
941 * irq is associated via 'interrupts' property in DT
942 */
943 tsdata->irq_pin = -EINVAL;
944 tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
945 tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
946
947 return 0;
948}
949#else
950static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
951 struct edt_ft5x06_ts_data *tsdata)
952{
953 return -ENODEV;
954}
955#endif
956
957static int edt_ft5x06_ts_probe(struct i2c_client *client,
958 const struct i2c_device_id *id)
959{
960 const struct edt_ft5x06_platform_data *pdata =
961 dev_get_platdata(&client->dev);
962 struct edt_ft5x06_ts_data *tsdata;
963 struct input_dev *input;
964 int error;
965 char fw_version[EDT_NAME_LEN];
966
967 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
968
969 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
970 if (!tsdata) {
971 dev_err(&client->dev, "failed to allocate driver data.\n");
972 return -ENOMEM;
973 }
974
975 if (!pdata) {
976 error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
977 if (error) {
978 dev_err(&client->dev,
979 "DT probe failed and no platform data present\n");
980 return error;
981 }
982 } else {
983 tsdata->reset_pin = pdata->reset_pin;
984 tsdata->irq_pin = pdata->irq_pin;
985 tsdata->wake_pin = -EINVAL;
986 }
987
988 error = edt_ft5x06_ts_reset(client, tsdata);
989 if (error)
990 return error;
991
992 if (gpio_is_valid(tsdata->irq_pin)) {
993 error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
994 GPIOF_IN, "edt-ft5x06 irq");
995 if (error) {
996 dev_err(&client->dev,
997 "Failed to request GPIO %d, error %d\n",
998 tsdata->irq_pin, error);
999 return error;
1000 }
1001 }
1002
1003 input = devm_input_allocate_device(&client->dev);
1004 if (!input) {
1005 dev_err(&client->dev, "failed to allocate input device.\n");
1006 return -ENOMEM;
1007 }
1008
1009 mutex_init(&tsdata->mutex);
1010 tsdata->client = client;
1011 tsdata->input = input;
1012 tsdata->factory_mode = false;
1013
1014 error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
1015 if (error) {
1016 dev_err(&client->dev, "touchscreen probe failed\n");
1017 return error;
1018 }
1019
1020 edt_ft5x06_ts_set_regs(tsdata);
1021
1022 if (!pdata)
1023 edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
1024 else
1025 edt_ft5x06_ts_get_defaults(tsdata, pdata);
1026
1027 edt_ft5x06_ts_get_parameters(tsdata);
1028
1029 dev_dbg(&client->dev,
1030 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1031 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1032
1033 input->name = tsdata->name;
1034 input->id.bustype = BUS_I2C;
1035 input->dev.parent = &client->dev;
1036
1037 __set_bit(EV_SYN, input->evbit);
1038 __set_bit(EV_KEY, input->evbit);
1039 __set_bit(EV_ABS, input->evbit);
1040 __set_bit(BTN_TOUCH, input->keybit);
1041 input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
1042 input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
1043 input_set_abs_params(input, ABS_MT_POSITION_X,
1044 0, tsdata->num_x * 64 - 1, 0, 0);
1045 input_set_abs_params(input, ABS_MT_POSITION_Y,
1046 0, tsdata->num_y * 64 - 1, 0, 0);
1047 error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
1048 if (error) {
1049 dev_err(&client->dev, "Unable to init MT slots.\n");
1050 return error;
1051 }
1052
1053 input_set_drvdata(input, tsdata);
1054 i2c_set_clientdata(client, tsdata);
1055
1056 error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
1057 edt_ft5x06_ts_isr,
1058 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1059 client->name, tsdata);
1060 if (error) {
1061 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1062 return error;
1063 }
1064
1065 error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1066 if (error)
1067 return error;
1068
1069 error = input_register_device(input);
1070 if (error)
1071 goto err_remove_attrs;
1072
1073 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1074 device_init_wakeup(&client->dev, 1);
1075
1076 dev_dbg(&client->dev,
1077 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1078 client->irq, tsdata->wake_pin, tsdata->reset_pin);
1079
1080 return 0;
1081
1082err_remove_attrs:
1083 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1084 return error;
1085}
1086
1087static int edt_ft5x06_ts_remove(struct i2c_client *client)
1088{
1089 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1090
1091 edt_ft5x06_ts_teardown_debugfs(tsdata);
1092 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1093
1094 return 0;
1095}
1096
1097#ifdef CONFIG_PM_SLEEP
1098static int edt_ft5x06_ts_suspend(struct device *dev)
1099{
1100 struct i2c_client *client = to_i2c_client(dev);
1101
1102 if (device_may_wakeup(dev))
1103 enable_irq_wake(client->irq);
1104
1105 return 0;
1106}
1107
1108static int edt_ft5x06_ts_resume(struct device *dev)
1109{
1110 struct i2c_client *client = to_i2c_client(dev);
1111
1112 if (device_may_wakeup(dev))
1113 disable_irq_wake(client->irq);
1114
1115 return 0;
1116}
1117#endif
1118
1119static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1120 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1121
1122static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1123 { "edt-ft5x06", 0, },
1124 { /* sentinel */ }
1125};
1126MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1127
1128#ifdef CONFIG_OF
1129static const struct of_device_id edt_ft5x06_of_match[] = {
1130 { .compatible = "edt,edt-ft5206", },
1131 { .compatible = "edt,edt-ft5306", },
1132 { .compatible = "edt,edt-ft5406", },
1133 { /* sentinel */ }
1134};
1135MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1136#endif
1137
1138static struct i2c_driver edt_ft5x06_ts_driver = {
1139 .driver = {
1140 .owner = THIS_MODULE,
1141 .name = "edt_ft5x06",
1142 .of_match_table = of_match_ptr(edt_ft5x06_of_match),
1143 .pm = &edt_ft5x06_ts_pm_ops,
1144 },
1145 .id_table = edt_ft5x06_ts_id,
1146 .probe = edt_ft5x06_ts_probe,
1147 .remove = edt_ft5x06_ts_remove,
1148};
1149
1150module_i2c_driver(edt_ft5x06_ts_driver);
1151
1152MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1153MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1154MODULE_LICENSE("GPL");
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 * Dario Binacchi <dario.binacchi@amarulasolutions.com> (regmap support)
7 */
8
9/*
10 * This is a driver for the EDT "Polytouch" family of touch controllers
11 * based on the FocalTech FT5x06 line of chips.
12 *
13 * Development of this driver has been sponsored by Glyn:
14 * http://www.glyn.com/Products/Displays
15 */
16
17#include <linux/debugfs.h>
18#include <linux/delay.h>
19#include <linux/gpio/consumer.h>
20#include <linux/i2c.h>
21#include <linux/interrupt.h>
22#include <linux/input.h>
23#include <linux/input/mt.h>
24#include <linux/input/touchscreen.h>
25#include <linux/irq.h>
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/property.h>
29#include <linux/ratelimit.h>
30#include <linux/regmap.h>
31#include <linux/regulator/consumer.h>
32#include <linux/slab.h>
33#include <linux/uaccess.h>
34
35#include <asm/unaligned.h>
36
37#define WORK_REGISTER_THRESHOLD 0x00
38#define WORK_REGISTER_REPORT_RATE 0x08
39#define WORK_REGISTER_GAIN 0x30
40#define WORK_REGISTER_OFFSET 0x31
41#define WORK_REGISTER_NUM_X 0x33
42#define WORK_REGISTER_NUM_Y 0x34
43
44#define PMOD_REGISTER_ACTIVE 0x00
45#define PMOD_REGISTER_HIBERNATE 0x03
46
47#define M09_REGISTER_THRESHOLD 0x80
48#define M09_REGISTER_GAIN 0x92
49#define M09_REGISTER_OFFSET 0x93
50#define M09_REGISTER_NUM_X 0x94
51#define M09_REGISTER_NUM_Y 0x95
52
53#define M12_REGISTER_REPORT_RATE 0x88
54
55#define EV_REGISTER_THRESHOLD 0x40
56#define EV_REGISTER_GAIN 0x41
57#define EV_REGISTER_OFFSET_Y 0x45
58#define EV_REGISTER_OFFSET_X 0x46
59
60#define NO_REGISTER 0xff
61
62#define WORK_REGISTER_OPMODE 0x3c
63#define FACTORY_REGISTER_OPMODE 0x01
64#define PMOD_REGISTER_OPMODE 0xa5
65
66#define TOUCH_EVENT_DOWN 0x00
67#define TOUCH_EVENT_UP 0x01
68#define TOUCH_EVENT_ON 0x02
69#define TOUCH_EVENT_RESERVED 0x03
70
71#define EDT_NAME_LEN 23
72#define EDT_SWITCH_MODE_RETRIES 10
73#define EDT_SWITCH_MODE_DELAY 5 /* msec */
74#define EDT_RAW_DATA_RETRIES 100
75#define EDT_RAW_DATA_DELAY 1000 /* usec */
76
77#define EDT_DEFAULT_NUM_X 1024
78#define EDT_DEFAULT_NUM_Y 1024
79
80#define M06_REG_CMD(factory) ((factory) ? 0xf3 : 0xfc)
81#define M06_REG_ADDR(factory, addr) ((factory) ? (addr) & 0x7f : (addr) & 0x3f)
82
83enum edt_pmode {
84 EDT_PMODE_NOT_SUPPORTED,
85 EDT_PMODE_HIBERNATE,
86 EDT_PMODE_POWEROFF,
87};
88
89enum edt_ver {
90 EDT_M06,
91 EDT_M09,
92 EDT_M12,
93 EV_FT,
94 GENERIC_FT,
95};
96
97struct edt_reg_addr {
98 int reg_threshold;
99 int reg_report_rate;
100 int reg_gain;
101 int reg_offset;
102 int reg_offset_x;
103 int reg_offset_y;
104 int reg_num_x;
105 int reg_num_y;
106};
107
108struct edt_ft5x06_ts_data {
109 struct i2c_client *client;
110 struct input_dev *input;
111 struct touchscreen_properties prop;
112 u16 num_x;
113 u16 num_y;
114 struct regulator *vcc;
115 struct regulator *iovcc;
116
117 struct gpio_desc *reset_gpio;
118 struct gpio_desc *wake_gpio;
119
120 struct regmap *regmap;
121
122#if defined(CONFIG_DEBUG_FS)
123 struct dentry *debug_dir;
124 u8 *raw_buffer;
125 size_t raw_bufsize;
126#endif
127
128 struct mutex mutex;
129 bool factory_mode;
130 enum edt_pmode suspend_mode;
131 int threshold;
132 int gain;
133 int offset;
134 int offset_x;
135 int offset_y;
136 int report_rate;
137 int max_support_points;
138 int point_len;
139 u8 tdata_cmd;
140 int tdata_len;
141 int tdata_offset;
142
143 char name[EDT_NAME_LEN];
144 char fw_version[EDT_NAME_LEN];
145
146 struct edt_reg_addr reg_addr;
147 enum edt_ver version;
148 unsigned int crc_errors;
149 unsigned int header_errors;
150};
151
152struct edt_i2c_chip_data {
153 int max_support_points;
154};
155
156static const struct regmap_config edt_ft5x06_i2c_regmap_config = {
157 .reg_bits = 8,
158 .val_bits = 8,
159};
160
161static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
162 u8 *buf, int buflen)
163{
164 int i;
165 u8 crc = 0;
166
167 for (i = 0; i < buflen - 1; i++)
168 crc ^= buf[i];
169
170 if (crc != buf[buflen - 1]) {
171 tsdata->crc_errors++;
172 dev_err_ratelimited(&tsdata->client->dev,
173 "crc error: 0x%02x expected, got 0x%02x\n",
174 crc, buf[buflen - 1]);
175 return false;
176 }
177
178 return true;
179}
180
181static int edt_M06_i2c_read(void *context, const void *reg_buf, size_t reg_size,
182 void *val_buf, size_t val_size)
183{
184 struct device *dev = context;
185 struct i2c_client *i2c = to_i2c_client(dev);
186 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(i2c);
187 struct i2c_msg xfer[2];
188 bool reg_read = false;
189 u8 addr;
190 u8 wlen;
191 u8 wbuf[4], rbuf[3];
192 int ret;
193
194 addr = *((u8 *)reg_buf);
195 wbuf[0] = addr;
196 switch (addr) {
197 case 0xf5:
198 wlen = 3;
199 wbuf[0] = 0xf5;
200 wbuf[1] = 0xe;
201 wbuf[2] = *((u8 *)val_buf);
202 break;
203 case 0xf9:
204 wlen = 1;
205 break;
206 default:
207 wlen = 2;
208 reg_read = true;
209 wbuf[0] = M06_REG_CMD(tsdata->factory_mode);
210 wbuf[1] = M06_REG_ADDR(tsdata->factory_mode, addr);
211 wbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
212 }
213
214 xfer[0].addr = i2c->addr;
215 xfer[0].flags = 0;
216 xfer[0].len = wlen;
217 xfer[0].buf = wbuf;
218
219 xfer[1].addr = i2c->addr;
220 xfer[1].flags = I2C_M_RD;
221 xfer[1].len = reg_read ? 2 : val_size;
222 xfer[1].buf = reg_read ? rbuf : val_buf;
223
224 ret = i2c_transfer(i2c->adapter, xfer, 2);
225 if (ret != 2) {
226 if (ret < 0)
227 return ret;
228
229 return -EIO;
230 }
231
232 if (addr == 0xf9) {
233 u8 *buf = (u8 *)val_buf;
234
235 if (buf[0] != 0xaa || buf[1] != 0xaa ||
236 buf[2] != val_size) {
237 tsdata->header_errors++;
238 dev_err_ratelimited(dev,
239 "Unexpected header: %02x%02x%02x\n",
240 buf[0], buf[1], buf[2]);
241 return -EIO;
242 }
243
244 if (!edt_ft5x06_ts_check_crc(tsdata, val_buf, val_size))
245 return -EIO;
246 } else if (reg_read) {
247 wbuf[2] = rbuf[0];
248 wbuf[3] = rbuf[1];
249 if (!edt_ft5x06_ts_check_crc(tsdata, wbuf, 4))
250 return -EIO;
251
252 *((u8 *)val_buf) = rbuf[0];
253 }
254
255 return 0;
256}
257
258static int edt_M06_i2c_write(void *context, const void *data, size_t count)
259{
260 struct device *dev = context;
261 struct i2c_client *i2c = to_i2c_client(dev);
262 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(i2c);
263 u8 addr, val;
264 u8 wbuf[4];
265 struct i2c_msg xfer;
266 int ret;
267
268 addr = *((u8 *)data);
269 val = *((u8 *)data + 1);
270
271 wbuf[0] = M06_REG_CMD(tsdata->factory_mode);
272 wbuf[1] = M06_REG_ADDR(tsdata->factory_mode, addr);
273 wbuf[2] = val;
274 wbuf[3] = wbuf[0] ^ wbuf[1] ^ wbuf[2];
275
276 xfer.addr = i2c->addr;
277 xfer.flags = 0;
278 xfer.len = 4;
279 xfer.buf = wbuf;
280
281 ret = i2c_transfer(i2c->adapter, &xfer, 1);
282 if (ret != 1) {
283 if (ret < 0)
284 return ret;
285
286 return -EIO;
287 }
288
289 return 0;
290}
291
292static const struct regmap_config edt_M06_i2c_regmap_config = {
293 .reg_bits = 8,
294 .val_bits = 8,
295 .read = edt_M06_i2c_read,
296 .write = edt_M06_i2c_write,
297};
298
299static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
300{
301 struct edt_ft5x06_ts_data *tsdata = dev_id;
302 struct device *dev = &tsdata->client->dev;
303 u8 rdbuf[63];
304 int i, type, x, y, id;
305 int error;
306
307 memset(rdbuf, 0, sizeof(rdbuf));
308 error = regmap_bulk_read(tsdata->regmap, tsdata->tdata_cmd, rdbuf,
309 tsdata->tdata_len);
310 if (error) {
311 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
312 error);
313 goto out;
314 }
315
316 for (i = 0; i < tsdata->max_support_points; i++) {
317 u8 *buf = &rdbuf[i * tsdata->point_len + tsdata->tdata_offset];
318
319 type = buf[0] >> 6;
320 /* ignore Reserved events */
321 if (type == TOUCH_EVENT_RESERVED)
322 continue;
323
324 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
325 if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
326 continue;
327
328 x = get_unaligned_be16(buf) & 0x0fff;
329 y = get_unaligned_be16(buf + 2) & 0x0fff;
330 /* The FT5x26 send the y coordinate first */
331 if (tsdata->version == EV_FT)
332 swap(x, y);
333
334 id = (buf[2] >> 4) & 0x0f;
335
336 input_mt_slot(tsdata->input, id);
337 if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
338 type != TOUCH_EVENT_UP))
339 touchscreen_report_pos(tsdata->input, &tsdata->prop,
340 x, y, true);
341 }
342
343 input_mt_report_pointer_emulation(tsdata->input, true);
344 input_sync(tsdata->input);
345
346out:
347 return IRQ_HANDLED;
348}
349
350struct edt_ft5x06_attribute {
351 struct device_attribute dattr;
352 size_t field_offset;
353 u8 limit_low;
354 u8 limit_high;
355 u8 addr_m06;
356 u8 addr_m09;
357 u8 addr_ev;
358};
359
360#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev, \
361 _limit_low, _limit_high) \
362 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
363 .dattr = __ATTR(_field, _mode, \
364 edt_ft5x06_setting_show, \
365 edt_ft5x06_setting_store), \
366 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
367 .addr_m06 = _addr_m06, \
368 .addr_m09 = _addr_m09, \
369 .addr_ev = _addr_ev, \
370 .limit_low = _limit_low, \
371 .limit_high = _limit_high, \
372 }
373
374static ssize_t edt_ft5x06_setting_show(struct device *dev,
375 struct device_attribute *dattr,
376 char *buf)
377{
378 struct i2c_client *client = to_i2c_client(dev);
379 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
380 struct edt_ft5x06_attribute *attr =
381 container_of(dattr, struct edt_ft5x06_attribute, dattr);
382 u8 *field = (u8 *)tsdata + attr->field_offset;
383 unsigned int val;
384 size_t count = 0;
385 int error = 0;
386 u8 addr;
387
388 mutex_lock(&tsdata->mutex);
389
390 if (tsdata->factory_mode) {
391 error = -EIO;
392 goto out;
393 }
394
395 switch (tsdata->version) {
396 case EDT_M06:
397 addr = attr->addr_m06;
398 break;
399
400 case EDT_M09:
401 case EDT_M12:
402 case GENERIC_FT:
403 addr = attr->addr_m09;
404 break;
405
406 case EV_FT:
407 addr = attr->addr_ev;
408 break;
409
410 default:
411 error = -ENODEV;
412 goto out;
413 }
414
415 if (addr != NO_REGISTER) {
416 error = regmap_read(tsdata->regmap, addr, &val);
417 if (error) {
418 dev_err(&tsdata->client->dev,
419 "Failed to fetch attribute %s, error %d\n",
420 dattr->attr.name, error);
421 goto out;
422 }
423 } else {
424 val = *field;
425 }
426
427 if (val != *field) {
428 dev_warn(&tsdata->client->dev,
429 "%s: read (%d) and stored value (%d) differ\n",
430 dattr->attr.name, val, *field);
431 *field = val;
432 }
433
434 count = sysfs_emit(buf, "%d\n", val);
435out:
436 mutex_unlock(&tsdata->mutex);
437 return error ?: count;
438}
439
440static ssize_t edt_ft5x06_setting_store(struct device *dev,
441 struct device_attribute *dattr,
442 const char *buf, size_t count)
443{
444 struct i2c_client *client = to_i2c_client(dev);
445 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
446 struct edt_ft5x06_attribute *attr =
447 container_of(dattr, struct edt_ft5x06_attribute, dattr);
448 u8 *field = (u8 *)tsdata + attr->field_offset;
449 unsigned int val;
450 int error;
451 u8 addr;
452
453 mutex_lock(&tsdata->mutex);
454
455 if (tsdata->factory_mode) {
456 error = -EIO;
457 goto out;
458 }
459
460 error = kstrtouint(buf, 0, &val);
461 if (error)
462 goto out;
463
464 if (val < attr->limit_low || val > attr->limit_high) {
465 error = -ERANGE;
466 goto out;
467 }
468
469 switch (tsdata->version) {
470 case EDT_M06:
471 addr = attr->addr_m06;
472 break;
473
474 case EDT_M09:
475 case EDT_M12:
476 case GENERIC_FT:
477 addr = attr->addr_m09;
478 break;
479
480 case EV_FT:
481 addr = attr->addr_ev;
482 break;
483
484 default:
485 error = -ENODEV;
486 goto out;
487 }
488
489 if (addr != NO_REGISTER) {
490 error = regmap_write(tsdata->regmap, addr, val);
491 if (error) {
492 dev_err(&tsdata->client->dev,
493 "Failed to update attribute %s, error: %d\n",
494 dattr->attr.name, error);
495 goto out;
496 }
497 }
498 *field = val;
499
500out:
501 mutex_unlock(&tsdata->mutex);
502 return error ?: count;
503}
504
505/* m06, m09: range 0-31, m12: range 0-5 */
506static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
507 M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31);
508/* m06, m09: range 0-31, m12: range 0-16 */
509static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
510 M09_REGISTER_OFFSET, NO_REGISTER, 0, 31);
511/* m06, m09, m12: no supported, ev_ft: range 0-80 */
512static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
513 EV_REGISTER_OFFSET_X, 0, 80);
514/* m06, m09, m12: no supported, ev_ft: range 0-80 */
515static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
516 EV_REGISTER_OFFSET_Y, 0, 80);
517/* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */
518static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
519 M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255);
520/* m06: range 3 to 14, m12: range 1 to 255 */
521static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
522 M12_REGISTER_REPORT_RATE, NO_REGISTER, 0, 255);
523
524static ssize_t model_show(struct device *dev, struct device_attribute *attr,
525 char *buf)
526{
527 struct i2c_client *client = to_i2c_client(dev);
528 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
529
530 return sysfs_emit(buf, "%s\n", tsdata->name);
531}
532
533static DEVICE_ATTR_RO(model);
534
535static ssize_t fw_version_show(struct device *dev,
536 struct device_attribute *attr, char *buf)
537{
538 struct i2c_client *client = to_i2c_client(dev);
539 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
540
541 return sysfs_emit(buf, "%s\n", tsdata->fw_version);
542}
543
544static DEVICE_ATTR_RO(fw_version);
545
546/* m06 only */
547static ssize_t header_errors_show(struct device *dev,
548 struct device_attribute *attr, char *buf)
549{
550 struct i2c_client *client = to_i2c_client(dev);
551 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
552
553 return sysfs_emit(buf, "%d\n", tsdata->header_errors);
554}
555
556static DEVICE_ATTR_RO(header_errors);
557
558/* m06 only */
559static ssize_t crc_errors_show(struct device *dev,
560 struct device_attribute *attr, char *buf)
561{
562 struct i2c_client *client = to_i2c_client(dev);
563 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
564
565 return sysfs_emit(buf, "%d\n", tsdata->crc_errors);
566}
567
568static DEVICE_ATTR_RO(crc_errors);
569
570static struct attribute *edt_ft5x06_attrs[] = {
571 &edt_ft5x06_attr_gain.dattr.attr,
572 &edt_ft5x06_attr_offset.dattr.attr,
573 &edt_ft5x06_attr_offset_x.dattr.attr,
574 &edt_ft5x06_attr_offset_y.dattr.attr,
575 &edt_ft5x06_attr_threshold.dattr.attr,
576 &edt_ft5x06_attr_report_rate.dattr.attr,
577 &dev_attr_model.attr,
578 &dev_attr_fw_version.attr,
579 &dev_attr_header_errors.attr,
580 &dev_attr_crc_errors.attr,
581 NULL
582};
583ATTRIBUTE_GROUPS(edt_ft5x06);
584
585static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata)
586{
587 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
588 struct regmap *regmap = tsdata->regmap;
589
590 regmap_write(regmap, reg_addr->reg_threshold, tsdata->threshold);
591 regmap_write(regmap, reg_addr->reg_gain, tsdata->gain);
592 if (reg_addr->reg_offset != NO_REGISTER)
593 regmap_write(regmap, reg_addr->reg_offset, tsdata->offset);
594 if (reg_addr->reg_offset_x != NO_REGISTER)
595 regmap_write(regmap, reg_addr->reg_offset_x, tsdata->offset_x);
596 if (reg_addr->reg_offset_y != NO_REGISTER)
597 regmap_write(regmap, reg_addr->reg_offset_y, tsdata->offset_y);
598 if (reg_addr->reg_report_rate != NO_REGISTER)
599 regmap_write(regmap, reg_addr->reg_report_rate,
600 tsdata->report_rate);
601}
602
603#ifdef CONFIG_DEBUG_FS
604static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
605{
606 struct i2c_client *client = tsdata->client;
607 int retries = EDT_SWITCH_MODE_RETRIES;
608 unsigned int val;
609 int error;
610
611 if (tsdata->version != EDT_M06) {
612 dev_err(&client->dev,
613 "No factory mode support for non-M06 devices\n");
614 return -EINVAL;
615 }
616
617 disable_irq(client->irq);
618
619 if (!tsdata->raw_buffer) {
620 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
621 sizeof(u16);
622 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
623 if (!tsdata->raw_buffer) {
624 error = -ENOMEM;
625 goto err_out;
626 }
627 }
628
629 /* mode register is 0x3c when in the work mode */
630 error = regmap_write(tsdata->regmap, WORK_REGISTER_OPMODE, 0x03);
631 if (error) {
632 dev_err(&client->dev,
633 "failed to switch to factory mode, error %d\n", error);
634 goto err_out;
635 }
636
637 tsdata->factory_mode = true;
638 do {
639 mdelay(EDT_SWITCH_MODE_DELAY);
640 /* mode register is 0x01 when in factory mode */
641 error = regmap_read(tsdata->regmap, FACTORY_REGISTER_OPMODE,
642 &val);
643 if (!error && val == 0x03)
644 break;
645 } while (--retries > 0);
646
647 if (retries == 0) {
648 dev_err(&client->dev, "not in factory mode after %dms.\n",
649 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
650 error = -EIO;
651 goto err_out;
652 }
653
654 return 0;
655
656err_out:
657 kfree(tsdata->raw_buffer);
658 tsdata->raw_buffer = NULL;
659 tsdata->factory_mode = false;
660 enable_irq(client->irq);
661
662 return error;
663}
664
665static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
666{
667 struct i2c_client *client = tsdata->client;
668 int retries = EDT_SWITCH_MODE_RETRIES;
669 unsigned int val;
670 int error;
671
672 /* mode register is 0x01 when in the factory mode */
673 error = regmap_write(tsdata->regmap, FACTORY_REGISTER_OPMODE, 0x1);
674 if (error) {
675 dev_err(&client->dev,
676 "failed to switch to work mode, error: %d\n", error);
677 return error;
678 }
679
680 tsdata->factory_mode = false;
681
682 do {
683 mdelay(EDT_SWITCH_MODE_DELAY);
684 /* mode register is 0x01 when in factory mode */
685 error = regmap_read(tsdata->regmap, WORK_REGISTER_OPMODE, &val);
686 if (!error && val == 0x01)
687 break;
688 } while (--retries > 0);
689
690 if (retries == 0) {
691 dev_err(&client->dev, "not in work mode after %dms.\n",
692 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
693 tsdata->factory_mode = true;
694 return -EIO;
695 }
696
697 kfree(tsdata->raw_buffer);
698 tsdata->raw_buffer = NULL;
699
700 edt_ft5x06_restore_reg_parameters(tsdata);
701 enable_irq(client->irq);
702
703 return 0;
704}
705
706static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
707{
708 struct edt_ft5x06_ts_data *tsdata = data;
709
710 *mode = tsdata->factory_mode;
711
712 return 0;
713};
714
715static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
716{
717 struct edt_ft5x06_ts_data *tsdata = data;
718 int retval = 0;
719
720 if (mode > 1)
721 return -ERANGE;
722
723 mutex_lock(&tsdata->mutex);
724
725 if (mode != tsdata->factory_mode) {
726 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
727 edt_ft5x06_work_mode(tsdata);
728 }
729
730 mutex_unlock(&tsdata->mutex);
731
732 return retval;
733};
734
735DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
736 edt_ft5x06_debugfs_mode_set, "%llu\n");
737
738static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
739 char __user *buf, size_t count,
740 loff_t *off)
741{
742 struct edt_ft5x06_ts_data *tsdata = file->private_data;
743 struct i2c_client *client = tsdata->client;
744 int retries = EDT_RAW_DATA_RETRIES;
745 unsigned int val;
746 int i, error;
747 size_t read = 0;
748 int colbytes;
749 u8 *rdbuf;
750
751 if (*off < 0 || *off >= tsdata->raw_bufsize)
752 return 0;
753
754 mutex_lock(&tsdata->mutex);
755
756 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
757 error = -EIO;
758 goto out;
759 }
760
761 error = regmap_write(tsdata->regmap, 0x08, 0x01);
762 if (error) {
763 dev_err(&client->dev,
764 "failed to write 0x08 register, error %d\n", error);
765 goto out;
766 }
767
768 do {
769 usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
770 error = regmap_read(tsdata->regmap, 0x08, &val);
771 if (error) {
772 dev_err(&client->dev,
773 "failed to read 0x08 register, error %d\n",
774 error);
775 goto out;
776 }
777
778 if (val == 1)
779 break;
780 } while (--retries > 0);
781
782 if (retries == 0) {
783 dev_err(&client->dev,
784 "timed out waiting for register to settle\n");
785 error = -ETIMEDOUT;
786 goto out;
787 }
788
789 rdbuf = tsdata->raw_buffer;
790 colbytes = tsdata->num_y * sizeof(u16);
791
792 for (i = 0; i < tsdata->num_x; i++) {
793 rdbuf[0] = i; /* column index */
794 error = regmap_bulk_read(tsdata->regmap, 0xf5, rdbuf, colbytes);
795 if (error)
796 goto out;
797
798 rdbuf += colbytes;
799 }
800
801 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
802 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
803 error = -EFAULT;
804 goto out;
805 }
806
807 *off += read;
808out:
809 mutex_unlock(&tsdata->mutex);
810 return error ?: read;
811};
812
813static const struct file_operations debugfs_raw_data_fops = {
814 .open = simple_open,
815 .read = edt_ft5x06_debugfs_raw_data_read,
816};
817
818static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
819 const char *debugfs_name)
820{
821 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
822
823 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
824 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
825
826 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
827 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
828 debugfs_create_file("raw_data", S_IRUSR,
829 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
830}
831
832static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
833{
834 debugfs_remove_recursive(tsdata->debug_dir);
835 kfree(tsdata->raw_buffer);
836}
837
838#else
839
840static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
841{
842 return -ENOSYS;
843}
844
845static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
846 const char *debugfs_name)
847{
848}
849
850static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
851{
852}
853
854#endif /* CONFIG_DEBUGFS */
855
856static int edt_ft5x06_ts_identify(struct i2c_client *client,
857 struct edt_ft5x06_ts_data *tsdata)
858{
859 u8 rdbuf[EDT_NAME_LEN];
860 char *p;
861 int error;
862 char *model_name = tsdata->name;
863 char *fw_version = tsdata->fw_version;
864
865 /* see what we find if we assume it is a M06 *
866 * if we get less than EDT_NAME_LEN, we don't want
867 * to have garbage in there
868 */
869 memset(rdbuf, 0, sizeof(rdbuf));
870 error = regmap_bulk_read(tsdata->regmap, 0xBB, rdbuf, EDT_NAME_LEN - 1);
871 if (error)
872 return error;
873
874 /* Probe content for something consistent.
875 * M06 starts with a response byte, M12 gives the data directly.
876 * M09/Generic does not provide model number information.
877 */
878 if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
879 tsdata->version = EDT_M06;
880
881 /* remove last '$' end marker */
882 rdbuf[EDT_NAME_LEN - 1] = '\0';
883 if (rdbuf[EDT_NAME_LEN - 2] == '$')
884 rdbuf[EDT_NAME_LEN - 2] = '\0';
885
886 /* look for Model/Version separator */
887 p = strchr(rdbuf, '*');
888 if (p)
889 *p++ = '\0';
890 strscpy(model_name, rdbuf + 1, EDT_NAME_LEN);
891 strscpy(fw_version, p ? p : "", EDT_NAME_LEN);
892
893 regmap_exit(tsdata->regmap);
894 tsdata->regmap = regmap_init_i2c(client,
895 &edt_M06_i2c_regmap_config);
896 if (IS_ERR(tsdata->regmap)) {
897 dev_err(&client->dev, "regmap allocation failed\n");
898 return PTR_ERR(tsdata->regmap);
899 }
900 } else if (!strncasecmp(rdbuf, "EP0", 3)) {
901 tsdata->version = EDT_M12;
902
903 /* remove last '$' end marker */
904 rdbuf[EDT_NAME_LEN - 2] = '\0';
905 if (rdbuf[EDT_NAME_LEN - 3] == '$')
906 rdbuf[EDT_NAME_LEN - 3] = '\0';
907
908 /* look for Model/Version separator */
909 p = strchr(rdbuf, '*');
910 if (p)
911 *p++ = '\0';
912 strscpy(model_name, rdbuf, EDT_NAME_LEN);
913 strscpy(fw_version, p ? p : "", EDT_NAME_LEN);
914 } else {
915 /* If it is not an EDT M06/M12 touchscreen, then the model
916 * detection is a bit hairy. The different ft5x06
917 * firmwares around don't reliably implement the
918 * identification registers. Well, we'll take a shot.
919 *
920 * The main difference between generic focaltec based
921 * touches and EDT M09 is that we know how to retrieve
922 * the max coordinates for the latter.
923 */
924 tsdata->version = GENERIC_FT;
925
926 error = regmap_bulk_read(tsdata->regmap, 0xA6, rdbuf, 2);
927 if (error)
928 return error;
929
930 strscpy(fw_version, rdbuf, 2);
931
932 error = regmap_bulk_read(tsdata->regmap, 0xA8, rdbuf, 1);
933 if (error)
934 return error;
935
936 /* This "model identification" is not exact. Unfortunately
937 * not all firmwares for the ft5x06 put useful values in
938 * the identification registers.
939 */
940 switch (rdbuf[0]) {
941 case 0x11: /* EDT EP0110M09 */
942 case 0x35: /* EDT EP0350M09 */
943 case 0x43: /* EDT EP0430M09 */
944 case 0x50: /* EDT EP0500M09 */
945 case 0x57: /* EDT EP0570M09 */
946 case 0x70: /* EDT EP0700M09 */
947 tsdata->version = EDT_M09;
948 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
949 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
950 break;
951 case 0xa1: /* EDT EP1010ML00 */
952 tsdata->version = EDT_M09;
953 snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00",
954 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
955 break;
956 case 0x5a: /* Solomon Goldentek Display */
957 snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0");
958 break;
959 case 0x59: /* Evervision Display with FT5xx6 TS */
960 tsdata->version = EV_FT;
961 error = regmap_bulk_read(tsdata->regmap, 0x53, rdbuf, 1);
962 if (error)
963 return error;
964 strscpy(fw_version, rdbuf, 1);
965 snprintf(model_name, EDT_NAME_LEN,
966 "EVERVISION-FT5726NEi");
967 break;
968 default:
969 snprintf(model_name, EDT_NAME_LEN,
970 "generic ft5x06 (%02x)",
971 rdbuf[0]);
972 break;
973 }
974 }
975
976 return 0;
977}
978
979static void edt_ft5x06_ts_get_defaults(struct device *dev,
980 struct edt_ft5x06_ts_data *tsdata)
981{
982 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
983 struct regmap *regmap = tsdata->regmap;
984 u32 val;
985 int error;
986
987 error = device_property_read_u32(dev, "threshold", &val);
988 if (!error) {
989 regmap_write(regmap, reg_addr->reg_threshold, val);
990 tsdata->threshold = val;
991 }
992
993 error = device_property_read_u32(dev, "gain", &val);
994 if (!error) {
995 regmap_write(regmap, reg_addr->reg_gain, val);
996 tsdata->gain = val;
997 }
998
999 error = device_property_read_u32(dev, "offset", &val);
1000 if (!error) {
1001 if (reg_addr->reg_offset != NO_REGISTER)
1002 regmap_write(regmap, reg_addr->reg_offset, val);
1003 tsdata->offset = val;
1004 }
1005
1006 error = device_property_read_u32(dev, "offset-x", &val);
1007 if (!error) {
1008 if (reg_addr->reg_offset_x != NO_REGISTER)
1009 regmap_write(regmap, reg_addr->reg_offset_x, val);
1010 tsdata->offset_x = val;
1011 }
1012
1013 error = device_property_read_u32(dev, "offset-y", &val);
1014 if (!error) {
1015 if (reg_addr->reg_offset_y != NO_REGISTER)
1016 regmap_write(regmap, reg_addr->reg_offset_y, val);
1017 tsdata->offset_y = val;
1018 }
1019}
1020
1021static void edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
1022{
1023 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
1024 struct regmap *regmap = tsdata->regmap;
1025 unsigned int val;
1026
1027 regmap_read(regmap, reg_addr->reg_threshold, &tsdata->threshold);
1028 regmap_read(regmap, reg_addr->reg_gain, &tsdata->gain);
1029 if (reg_addr->reg_offset != NO_REGISTER)
1030 regmap_read(regmap, reg_addr->reg_offset, &tsdata->offset);
1031 if (reg_addr->reg_offset_x != NO_REGISTER)
1032 regmap_read(regmap, reg_addr->reg_offset_x, &tsdata->offset_x);
1033 if (reg_addr->reg_offset_y != NO_REGISTER)
1034 regmap_read(regmap, reg_addr->reg_offset_y, &tsdata->offset_y);
1035 if (reg_addr->reg_report_rate != NO_REGISTER)
1036 regmap_read(regmap, reg_addr->reg_report_rate,
1037 &tsdata->report_rate);
1038 tsdata->num_x = EDT_DEFAULT_NUM_X;
1039 if (reg_addr->reg_num_x != NO_REGISTER) {
1040 if (!regmap_read(regmap, reg_addr->reg_num_x, &val))
1041 tsdata->num_x = val;
1042 }
1043 tsdata->num_y = EDT_DEFAULT_NUM_Y;
1044 if (reg_addr->reg_num_y != NO_REGISTER) {
1045 if (!regmap_read(regmap, reg_addr->reg_num_y, &val))
1046 tsdata->num_y = val;
1047 }
1048}
1049
1050static void edt_ft5x06_ts_set_tdata_parameters(struct edt_ft5x06_ts_data *tsdata)
1051{
1052 int crclen;
1053
1054 if (tsdata->version == EDT_M06) {
1055 tsdata->tdata_cmd = 0xf9;
1056 tsdata->tdata_offset = 5;
1057 tsdata->point_len = 4;
1058 crclen = 1;
1059 } else {
1060 tsdata->tdata_cmd = 0x0;
1061 tsdata->tdata_offset = 3;
1062 tsdata->point_len = 6;
1063 crclen = 0;
1064 }
1065
1066 tsdata->tdata_len = tsdata->point_len * tsdata->max_support_points +
1067 tsdata->tdata_offset + crclen;
1068}
1069
1070static void edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
1071{
1072 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
1073
1074 switch (tsdata->version) {
1075 case EDT_M06:
1076 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
1077 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
1078 reg_addr->reg_gain = WORK_REGISTER_GAIN;
1079 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
1080 reg_addr->reg_offset_x = NO_REGISTER;
1081 reg_addr->reg_offset_y = NO_REGISTER;
1082 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
1083 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
1084 break;
1085
1086 case EDT_M09:
1087 case EDT_M12:
1088 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1089 reg_addr->reg_report_rate = tsdata->version == EDT_M12 ?
1090 M12_REGISTER_REPORT_RATE : NO_REGISTER;
1091 reg_addr->reg_gain = M09_REGISTER_GAIN;
1092 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1093 reg_addr->reg_offset_x = NO_REGISTER;
1094 reg_addr->reg_offset_y = NO_REGISTER;
1095 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
1096 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
1097 break;
1098
1099 case EV_FT:
1100 reg_addr->reg_threshold = EV_REGISTER_THRESHOLD;
1101 reg_addr->reg_report_rate = NO_REGISTER;
1102 reg_addr->reg_gain = EV_REGISTER_GAIN;
1103 reg_addr->reg_offset = NO_REGISTER;
1104 reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X;
1105 reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y;
1106 reg_addr->reg_num_x = NO_REGISTER;
1107 reg_addr->reg_num_y = NO_REGISTER;
1108 break;
1109
1110 case GENERIC_FT:
1111 /* this is a guesswork */
1112 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
1113 reg_addr->reg_report_rate = NO_REGISTER;
1114 reg_addr->reg_gain = M09_REGISTER_GAIN;
1115 reg_addr->reg_offset = M09_REGISTER_OFFSET;
1116 reg_addr->reg_offset_x = NO_REGISTER;
1117 reg_addr->reg_offset_y = NO_REGISTER;
1118 reg_addr->reg_num_x = NO_REGISTER;
1119 reg_addr->reg_num_y = NO_REGISTER;
1120 break;
1121 }
1122}
1123
1124static void edt_ft5x06_disable_regulators(void *arg)
1125{
1126 struct edt_ft5x06_ts_data *data = arg;
1127
1128 regulator_disable(data->vcc);
1129 regulator_disable(data->iovcc);
1130}
1131
1132static int edt_ft5x06_ts_probe(struct i2c_client *client)
1133{
1134 const struct i2c_device_id *id = i2c_client_get_device_id(client);
1135 const struct edt_i2c_chip_data *chip_data;
1136 struct edt_ft5x06_ts_data *tsdata;
1137 unsigned int val;
1138 struct input_dev *input;
1139 unsigned long irq_flags;
1140 int error;
1141 u32 report_rate;
1142
1143 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
1144
1145 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
1146 if (!tsdata) {
1147 dev_err(&client->dev, "failed to allocate driver data.\n");
1148 return -ENOMEM;
1149 }
1150
1151 tsdata->regmap = regmap_init_i2c(client, &edt_ft5x06_i2c_regmap_config);
1152 if (IS_ERR(tsdata->regmap)) {
1153 dev_err(&client->dev, "regmap allocation failed\n");
1154 return PTR_ERR(tsdata->regmap);
1155 }
1156
1157 chip_data = device_get_match_data(&client->dev);
1158 if (!chip_data)
1159 chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
1160 if (!chip_data || !chip_data->max_support_points) {
1161 dev_err(&client->dev, "invalid or missing chip data\n");
1162 return -EINVAL;
1163 }
1164
1165 tsdata->max_support_points = chip_data->max_support_points;
1166
1167 tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
1168 if (IS_ERR(tsdata->vcc))
1169 return dev_err_probe(&client->dev, PTR_ERR(tsdata->vcc),
1170 "failed to request regulator\n");
1171
1172 tsdata->iovcc = devm_regulator_get(&client->dev, "iovcc");
1173 if (IS_ERR(tsdata->iovcc)) {
1174 error = PTR_ERR(tsdata->iovcc);
1175 if (error != -EPROBE_DEFER)
1176 dev_err(&client->dev,
1177 "failed to request iovcc regulator: %d\n", error);
1178 return error;
1179 }
1180
1181 error = regulator_enable(tsdata->iovcc);
1182 if (error < 0) {
1183 dev_err(&client->dev, "failed to enable iovcc: %d\n", error);
1184 return error;
1185 }
1186
1187 /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */
1188 usleep_range(10, 100);
1189
1190 error = regulator_enable(tsdata->vcc);
1191 if (error < 0) {
1192 dev_err(&client->dev, "failed to enable vcc: %d\n", error);
1193 regulator_disable(tsdata->iovcc);
1194 return error;
1195 }
1196
1197 error = devm_add_action_or_reset(&client->dev,
1198 edt_ft5x06_disable_regulators,
1199 tsdata);
1200 if (error)
1201 return error;
1202
1203 tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
1204 "reset", GPIOD_OUT_HIGH);
1205 if (IS_ERR(tsdata->reset_gpio)) {
1206 error = PTR_ERR(tsdata->reset_gpio);
1207 dev_err(&client->dev,
1208 "Failed to request GPIO reset pin, error %d\n", error);
1209 return error;
1210 }
1211
1212 tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
1213 "wake", GPIOD_OUT_LOW);
1214 if (IS_ERR(tsdata->wake_gpio)) {
1215 error = PTR_ERR(tsdata->wake_gpio);
1216 dev_err(&client->dev,
1217 "Failed to request GPIO wake pin, error %d\n", error);
1218 return error;
1219 }
1220
1221 /*
1222 * Check which sleep modes we can support. Power-off requieres the
1223 * reset-pin to ensure correct power-down/power-up behaviour. Start with
1224 * the EDT_PMODE_POWEROFF test since this is the deepest possible sleep
1225 * mode.
1226 */
1227 if (tsdata->reset_gpio)
1228 tsdata->suspend_mode = EDT_PMODE_POWEROFF;
1229 else if (tsdata->wake_gpio)
1230 tsdata->suspend_mode = EDT_PMODE_HIBERNATE;
1231 else
1232 tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED;
1233
1234 if (tsdata->wake_gpio) {
1235 usleep_range(5000, 6000);
1236 gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
1237 usleep_range(5000, 6000);
1238 }
1239
1240 if (tsdata->reset_gpio) {
1241 usleep_range(5000, 6000);
1242 gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
1243 msleep(300);
1244 }
1245
1246 input = devm_input_allocate_device(&client->dev);
1247 if (!input) {
1248 dev_err(&client->dev, "failed to allocate input device.\n");
1249 return -ENOMEM;
1250 }
1251
1252 mutex_init(&tsdata->mutex);
1253 tsdata->client = client;
1254 tsdata->input = input;
1255 tsdata->factory_mode = false;
1256 i2c_set_clientdata(client, tsdata);
1257
1258 error = edt_ft5x06_ts_identify(client, tsdata);
1259 if (error) {
1260 dev_err(&client->dev, "touchscreen probe failed\n");
1261 return error;
1262 }
1263
1264 /*
1265 * Dummy read access. EP0700MLP1 returns bogus data on the first
1266 * register read access and ignores writes.
1267 */
1268 regmap_read(tsdata->regmap, 0x00, &val);
1269
1270 edt_ft5x06_ts_set_tdata_parameters(tsdata);
1271 edt_ft5x06_ts_set_regs(tsdata);
1272 edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
1273 edt_ft5x06_ts_get_parameters(tsdata);
1274
1275 if (tsdata->reg_addr.reg_report_rate != NO_REGISTER &&
1276 !device_property_read_u32(&client->dev,
1277 "report-rate-hz", &report_rate)) {
1278 if (tsdata->version == EDT_M06)
1279 tsdata->report_rate = clamp_val(report_rate, 30, 140);
1280 else
1281 tsdata->report_rate = clamp_val(report_rate, 1, 255);
1282
1283 if (report_rate != tsdata->report_rate)
1284 dev_warn(&client->dev,
1285 "report-rate %dHz is unsupported, use %dHz\n",
1286 report_rate, tsdata->report_rate);
1287
1288 if (tsdata->version == EDT_M06)
1289 tsdata->report_rate /= 10;
1290
1291 regmap_write(tsdata->regmap, tsdata->reg_addr.reg_report_rate,
1292 tsdata->report_rate);
1293 }
1294
1295 dev_dbg(&client->dev,
1296 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1297 tsdata->name, tsdata->fw_version, tsdata->num_x, tsdata->num_y);
1298
1299 input->name = tsdata->name;
1300 input->id.bustype = BUS_I2C;
1301 input->dev.parent = &client->dev;
1302
1303 input_set_abs_params(input, ABS_MT_POSITION_X,
1304 0, tsdata->num_x * 64 - 1, 0, 0);
1305 input_set_abs_params(input, ABS_MT_POSITION_Y,
1306 0, tsdata->num_y * 64 - 1, 0, 0);
1307
1308 touchscreen_parse_properties(input, true, &tsdata->prop);
1309
1310 error = input_mt_init_slots(input, tsdata->max_support_points,
1311 INPUT_MT_DIRECT);
1312 if (error) {
1313 dev_err(&client->dev, "Unable to init MT slots.\n");
1314 return error;
1315 }
1316
1317 irq_flags = irq_get_trigger_type(client->irq);
1318 if (irq_flags == IRQF_TRIGGER_NONE)
1319 irq_flags = IRQF_TRIGGER_FALLING;
1320 irq_flags |= IRQF_ONESHOT;
1321
1322 error = devm_request_threaded_irq(&client->dev, client->irq,
1323 NULL, edt_ft5x06_ts_isr, irq_flags,
1324 client->name, tsdata);
1325 if (error) {
1326 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
1327 return error;
1328 }
1329
1330 error = input_register_device(input);
1331 if (error)
1332 return error;
1333
1334 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1335
1336 dev_dbg(&client->dev,
1337 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1338 client->irq,
1339 tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
1340 tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
1341
1342 return 0;
1343}
1344
1345static void edt_ft5x06_ts_remove(struct i2c_client *client)
1346{
1347 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1348
1349 edt_ft5x06_ts_teardown_debugfs(tsdata);
1350 regmap_exit(tsdata->regmap);
1351}
1352
1353static int edt_ft5x06_ts_suspend(struct device *dev)
1354{
1355 struct i2c_client *client = to_i2c_client(dev);
1356 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1357 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1358 int ret;
1359
1360 if (device_may_wakeup(dev))
1361 return 0;
1362
1363 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1364 return 0;
1365
1366 /* Enter hibernate mode. */
1367 ret = regmap_write(tsdata->regmap, PMOD_REGISTER_OPMODE,
1368 PMOD_REGISTER_HIBERNATE);
1369 if (ret)
1370 dev_warn(dev, "Failed to set hibernate mode\n");
1371
1372 if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE)
1373 return 0;
1374
1375 /*
1376 * Power-off according the datasheet. Cut the power may leaf the irq
1377 * line in an undefined state depending on the host pull resistor
1378 * settings. Disable the irq to avoid adjusting each host till the
1379 * device is back in a full functional state.
1380 */
1381 disable_irq(tsdata->client->irq);
1382
1383 gpiod_set_value_cansleep(reset_gpio, 1);
1384 usleep_range(1000, 2000);
1385
1386 ret = regulator_disable(tsdata->vcc);
1387 if (ret)
1388 dev_warn(dev, "Failed to disable vcc\n");
1389 ret = regulator_disable(tsdata->iovcc);
1390 if (ret)
1391 dev_warn(dev, "Failed to disable iovcc\n");
1392
1393 return 0;
1394}
1395
1396static int edt_ft5x06_ts_resume(struct device *dev)
1397{
1398 struct i2c_client *client = to_i2c_client(dev);
1399 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1400 int ret = 0;
1401
1402 if (device_may_wakeup(dev))
1403 return 0;
1404
1405 if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
1406 return 0;
1407
1408 if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) {
1409 struct gpio_desc *reset_gpio = tsdata->reset_gpio;
1410
1411 /*
1412 * We can't check if the regulator is a dummy or a real
1413 * regulator. So we need to specify the 5ms reset time (T_rst)
1414 * here instead of the 100us T_rtp time. We also need to wait
1415 * 300ms in case it was a real supply and the power was cutted
1416 * of. Toggle the reset pin is also a way to exit the hibernate
1417 * mode.
1418 */
1419 gpiod_set_value_cansleep(reset_gpio, 1);
1420 usleep_range(5000, 6000);
1421
1422 ret = regulator_enable(tsdata->iovcc);
1423 if (ret) {
1424 dev_err(dev, "Failed to enable iovcc\n");
1425 return ret;
1426 }
1427
1428 /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */
1429 usleep_range(10, 100);
1430
1431 ret = regulator_enable(tsdata->vcc);
1432 if (ret) {
1433 dev_err(dev, "Failed to enable vcc\n");
1434 regulator_disable(tsdata->iovcc);
1435 return ret;
1436 }
1437
1438 usleep_range(1000, 2000);
1439 gpiod_set_value_cansleep(reset_gpio, 0);
1440 msleep(300);
1441
1442 edt_ft5x06_restore_reg_parameters(tsdata);
1443 enable_irq(tsdata->client->irq);
1444
1445 if (tsdata->factory_mode)
1446 ret = edt_ft5x06_factory_mode(tsdata);
1447 } else {
1448 struct gpio_desc *wake_gpio = tsdata->wake_gpio;
1449
1450 gpiod_set_value_cansleep(wake_gpio, 0);
1451 usleep_range(5000, 6000);
1452 gpiod_set_value_cansleep(wake_gpio, 1);
1453 }
1454
1455 return ret;
1456}
1457
1458static DEFINE_SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1459 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1460
1461static const struct edt_i2c_chip_data edt_ft5x06_data = {
1462 .max_support_points = 5,
1463};
1464
1465static const struct edt_i2c_chip_data edt_ft5506_data = {
1466 .max_support_points = 10,
1467};
1468
1469static const struct edt_i2c_chip_data edt_ft6236_data = {
1470 .max_support_points = 2,
1471};
1472
1473static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1474 { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
1475 { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
1476 { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data },
1477 /* Note no edt- prefix for compatibility with the ft6236.c driver */
1478 { .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
1479 { /* sentinel */ }
1480};
1481MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1482
1483static const struct of_device_id edt_ft5x06_of_match[] = {
1484 { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
1485 { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
1486 { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
1487 { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
1488 { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data },
1489 /* Note focaltech vendor prefix for compatibility with ft6236.c */
1490 { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
1491 { /* sentinel */ }
1492};
1493MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1494
1495static struct i2c_driver edt_ft5x06_ts_driver = {
1496 .driver = {
1497 .name = "edt_ft5x06",
1498 .dev_groups = edt_ft5x06_groups,
1499 .of_match_table = edt_ft5x06_of_match,
1500 .pm = pm_sleep_ptr(&edt_ft5x06_ts_pm_ops),
1501 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1502 },
1503 .id_table = edt_ft5x06_ts_id,
1504 .probe = edt_ft5x06_ts_probe,
1505 .remove = edt_ft5x06_ts_remove,
1506};
1507
1508module_i2c_driver(edt_ft5x06_ts_driver);
1509
1510MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1511MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1512MODULE_LICENSE("GPL v2");