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Input: edt-ft5x06 - ignore touchdown events
[deliverable/linux.git] / drivers / input / touchscreen / edt-ft5x06.c
CommitLineData
43c4d13e
SB		 1/*
2 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
dac90dc2 3 * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
43c4d13e
SB		 4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19/*
20 * This is a driver for the EDT "Polytouch" family of touch controllers
21 * based on the FocalTech FT5x06 line of chips.
22 *
23 * Development of this driver has been sponsored by Glyn:
24 * http://www.glyn.com/Products/Displays
25 */
26
27#include <linux/module.h>
28#include <linux/ratelimit.h>
29#include <linux/interrupt.h>
30#include <linux/input.h>
31#include <linux/i2c.h>
32#include <linux/uaccess.h>
33#include <linux/delay.h>
34#include <linux/debugfs.h>
35#include <linux/slab.h>
36#include <linux/gpio.h>
dac90dc2 37#include <linux/of_gpio.h>
43c4d13e
SB		 38#include <linux/input/mt.h>
39#include <linux/input/edt-ft5x06.h>
40
41#define MAX_SUPPORT_POINTS 5
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 WORK_REGISTER_OPMODE 0x3c
51#define FACTORY_REGISTER_OPMODE 0x01
52
53#define TOUCH_EVENT_DOWN 0x00
54#define TOUCH_EVENT_UP 0x01
55#define TOUCH_EVENT_ON 0x02
56#define TOUCH_EVENT_RESERVED 0x03
57
58#define EDT_NAME_LEN 23
59#define EDT_SWITCH_MODE_RETRIES 10
60#define EDT_SWITCH_MODE_DELAY 5 /* msec */
61#define EDT_RAW_DATA_RETRIES 100
62#define EDT_RAW_DATA_DELAY 1 /* msec */
63
64struct edt_ft5x06_ts_data {
65 struct i2c_client *client;
66 struct input_dev *input;
67 u16 num_x;
68 u16 num_y;
69
dac90dc2
LW		 70 int reset_pin;
71 int irq_pin;
72 int wake_pin;
73
43c4d13e
SB		 74#if defined(CONFIG_DEBUG_FS)
75 struct dentry *debug_dir;
76 u8 *raw_buffer;
77 size_t raw_bufsize;
78#endif
79
80 struct mutex mutex;
81 bool factory_mode;
82 int threshold;
83 int gain;
84 int offset;
85 int report_rate;
86
87 char name[EDT_NAME_LEN];
88};
89
90static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
91 u16 wr_len, u8 *wr_buf,
92 u16 rd_len, u8 *rd_buf)
93{
94 struct i2c_msg wrmsg[2];
95 int i = 0;
96 int ret;
97
98 if (wr_len) {
99 wrmsg[i].addr = client->addr;
100 wrmsg[i].flags = 0;
101 wrmsg[i].len = wr_len;
102 wrmsg[i].buf = wr_buf;
103 i++;
104 }
105 if (rd_len) {
106 wrmsg[i].addr = client->addr;
107 wrmsg[i].flags = I2C_M_RD;
108 wrmsg[i].len = rd_len;
109 wrmsg[i].buf = rd_buf;
110 i++;
111 }
112
113 ret = i2c_transfer(client->adapter, wrmsg, i);
114 if (ret < 0)
115 return ret;
116 if (ret != i)
117 return -EIO;
118
119 return 0;
120}
121
122static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
123 u8 *buf, int buflen)
124{
125 int i;
126 u8 crc = 0;
127
128 for (i = 0; i < buflen - 1; i++)
129 crc ^= buf[i];
130
131 if (crc != buf[buflen-1]) {
132 dev_err_ratelimited(&tsdata->client->dev,
133 "crc error: 0x%02x expected, got 0x%02x\n",
134 crc, buf[buflen-1]);
135 return false;
136 }
137
138 return true;
139}
140
141static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
142{
143 struct edt_ft5x06_ts_data *tsdata = dev_id;
144 struct device *dev = &tsdata->client->dev;
145 u8 cmd = 0xf9;
146 u8 rdbuf[26];
147 int i, type, x, y, id;
148 int error;
149
150 memset(rdbuf, 0, sizeof(rdbuf));
151
152 error = edt_ft5x06_ts_readwrite(tsdata->client,
153 sizeof(cmd), &cmd,
154 sizeof(rdbuf), rdbuf);
155 if (error) {
156 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
157 error);
158 goto out;
159 }
160
161 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || rdbuf[2] != 26) {
162 dev_err_ratelimited(dev, "Unexpected header: %02x%02x%02x!\n",
163 rdbuf[0], rdbuf[1], rdbuf[2]);
164 goto out;
165 }
166
167 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, 26))
168 goto out;
169
170 for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
171 u8 *buf = &rdbuf[i * 4 + 5];
172 bool down;
173
174 type = buf[0] >> 6;
175 /* ignore Reserved events */
176 if (type == TOUCH_EVENT_RESERVED)
177 continue;
178
ee3e946e
LW		 179 /* ignore TOUCH_DOWN events, might have bogus coordinates */
180 if (type == TOUCH_EVENT_DOWN)
181 continue;
182
43c4d13e
SB		 183 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
184 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
185 id = (buf[2] >> 4) & 0x0f;
1730d814 186 down = type != TOUCH_EVENT_UP;
43c4d13e
SB		 187
188 input_mt_slot(tsdata->input, id);
189 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
190
191 if (!down)
192 continue;
193
194 input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
195 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
196 }
197
198 input_mt_report_pointer_emulation(tsdata->input, true);
199 input_sync(tsdata->input);
200
201out:
202 return IRQ_HANDLED;
203}
204
205static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
206 u8 addr, u8 value)
207{
208 u8 wrbuf[4];
209
210 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
211 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
212 wrbuf[2] = value;
213 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
214
215 return edt_ft5x06_ts_readwrite(tsdata->client, 4, wrbuf, 0, NULL);
216}
217
218static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
219 u8 addr)
220{
221 u8 wrbuf[2], rdbuf[2];
222 int error;
223
224 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
225 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
226 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
227
228 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2, rdbuf);
229 if (error)
230 return error;
231
232 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
233 dev_err(&tsdata->client->dev,
234 "crc error: 0x%02x expected, got 0x%02x\n",
235 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0], rdbuf[1]);
236 return -EIO;
237 }
238
239 return rdbuf[0];
240}
241
242struct edt_ft5x06_attribute {
243 struct device_attribute dattr;
244 size_t field_offset;
245 u8 limit_low;
246 u8 limit_high;
247 u8 addr;
248};
249
250#define EDT_ATTR(_field, _mode, _addr, _limit_low, _limit_high) \
251 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
252 .dattr = __ATTR(_field, _mode, \
253 edt_ft5x06_setting_show, \
254 edt_ft5x06_setting_store), \
255 .field_offset = \
256 offsetof(struct edt_ft5x06_ts_data, _field), \
257 .limit_low = _limit_low, \
258 .limit_high = _limit_high, \
259 .addr = _addr, \
260 }
261
262static ssize_t edt_ft5x06_setting_show(struct device *dev,
263 struct device_attribute *dattr,
264 char *buf)
265{
266 struct i2c_client *client = to_i2c_client(dev);
267 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
268 struct edt_ft5x06_attribute *attr =
269 container_of(dattr, struct edt_ft5x06_attribute, dattr);
1730d814 270 u8 *field = (u8 *)tsdata + attr->field_offset;
43c4d13e
SB		 271 int val;
272 size_t count = 0;
273 int error = 0;
274
275 mutex_lock(&tsdata->mutex);
276
277 if (tsdata->factory_mode) {
278 error = -EIO;
279 goto out;
280 }
281
282 val = edt_ft5x06_register_read(tsdata, attr->addr);
283 if (val < 0) {
284 error = val;
285 dev_err(&tsdata->client->dev,
286 "Failed to fetch attribute %s, error %d\n",
287 dattr->attr.name, error);
288 goto out;
289 }
290
291 if (val != *field) {
292 dev_warn(&tsdata->client->dev,
293 "%s: read (%d) and stored value (%d) differ\n",
294 dattr->attr.name, val, *field);
295 *field = val;
296 }
297
298 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
299out:
300 mutex_unlock(&tsdata->mutex);
301 return error ?: count;
302}
303
304static ssize_t edt_ft5x06_setting_store(struct device *dev,
305 struct device_attribute *dattr,
306 const char *buf, size_t count)
307{
308 struct i2c_client *client = to_i2c_client(dev);
309 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
310 struct edt_ft5x06_attribute *attr =
311 container_of(dattr, struct edt_ft5x06_attribute, dattr);
1730d814 312 u8 *field = (u8 *)tsdata + attr->field_offset;
43c4d13e
SB		 313 unsigned int val;
314 int error;
315
316 mutex_lock(&tsdata->mutex);
317
318 if (tsdata->factory_mode) {
319 error = -EIO;
320 goto out;
321 }
322
323 error = kstrtouint(buf, 0, &val);
324 if (error)
325 goto out;
326
327 if (val < attr->limit_low || val > attr->limit_high) {
328 error = -ERANGE;
329 goto out;
330 }
331
332 error = edt_ft5x06_register_write(tsdata, attr->addr, val);
333 if (error) {
334 dev_err(&tsdata->client->dev,
335 "Failed to update attribute %s, error: %d\n",
336 dattr->attr.name, error);
337 goto out;
338 }
339
340 *field = val;
341
342out:
343 mutex_unlock(&tsdata->mutex);
344 return error ?: count;
345}
346
347static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, 0, 31);
348static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, 0, 31);
349static EDT_ATTR(threshold, S_IWUSR | S_IRUGO,
350 WORK_REGISTER_THRESHOLD, 20, 80);
351static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO,
352 WORK_REGISTER_REPORT_RATE, 3, 14);
353
354static struct attribute *edt_ft5x06_attrs[] = {
355 &edt_ft5x06_attr_gain.dattr.attr,
356 &edt_ft5x06_attr_offset.dattr.attr,
357 &edt_ft5x06_attr_threshold.dattr.attr,
358 &edt_ft5x06_attr_report_rate.dattr.attr,
359 NULL
360};
361
362static const struct attribute_group edt_ft5x06_attr_group = {
363 .attrs = edt_ft5x06_attrs,
364};
365
366#ifdef CONFIG_DEBUG_FS
367static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
368{
369 struct i2c_client *client = tsdata->client;
370 int retries = EDT_SWITCH_MODE_RETRIES;
371 int ret;
372 int error;
373
374 disable_irq(client->irq);
375
376 if (!tsdata->raw_buffer) {
377 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
378 sizeof(u16);
379 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
380 if (!tsdata->raw_buffer) {
381 error = -ENOMEM;
382 goto err_out;
383 }
384 }
385
386 /* mode register is 0x3c when in the work mode */
387 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
388 if (error) {
389 dev_err(&client->dev,
390 "failed to switch to factory mode, error %d\n", error);
391 goto err_out;
392 }
393
394 tsdata->factory_mode = true;
395 do {
396 mdelay(EDT_SWITCH_MODE_DELAY);
397 /* mode register is 0x01 when in factory mode */
398 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
399 if (ret == 0x03)
400 break;
401 } while (--retries > 0);
402
403 if (retries == 0) {
404 dev_err(&client->dev, "not in factory mode after %dms.\n",
405 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
406 error = -EIO;
407 goto err_out;
408 }
409
410 return 0;
411
412err_out:
413 kfree(tsdata->raw_buffer);
414 tsdata->raw_buffer = NULL;
415 tsdata->factory_mode = false;
416 enable_irq(client->irq);
417
418 return error;
419}
420
421static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
422{
423 struct i2c_client *client = tsdata->client;
424 int retries = EDT_SWITCH_MODE_RETRIES;
425 int ret;
426 int error;
427
428 /* mode register is 0x01 when in the factory mode */
429 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
430 if (error) {
431 dev_err(&client->dev,
432 "failed to switch to work mode, error: %d\n", error);
433 return error;
434 }
435
436 tsdata->factory_mode = false;
437
438 do {
439 mdelay(EDT_SWITCH_MODE_DELAY);
440 /* mode register is 0x01 when in factory mode */
441 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
442 if (ret == 0x01)
443 break;
444 } while (--retries > 0);
445
446 if (retries == 0) {
447 dev_err(&client->dev, "not in work mode after %dms.\n",
448 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
449 tsdata->factory_mode = true;
450 return -EIO;
451 }
452
8efcc503 453 kfree(tsdata->raw_buffer);
43c4d13e
SB		 454 tsdata->raw_buffer = NULL;
455
456 /* restore parameters */
457 edt_ft5x06_register_write(tsdata, WORK_REGISTER_THRESHOLD,
458 tsdata->threshold);
459 edt_ft5x06_register_write(tsdata, WORK_REGISTER_GAIN,
460 tsdata->gain);
461 edt_ft5x06_register_write(tsdata, WORK_REGISTER_OFFSET,
462 tsdata->offset);
463 edt_ft5x06_register_write(tsdata, WORK_REGISTER_REPORT_RATE,
464 tsdata->report_rate);
465
466 enable_irq(client->irq);
467
468 return 0;
469}
470
471static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
472{
473 struct edt_ft5x06_ts_data *tsdata = data;
474
475 *mode = tsdata->factory_mode;
476
477 return 0;
478};
479
480static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
481{
482 struct edt_ft5x06_ts_data *tsdata = data;
483 int retval = 0;
484
485 if (mode > 1)
486 return -ERANGE;
487
488 mutex_lock(&tsdata->mutex);
489
490 if (mode != tsdata->factory_mode) {
491 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
1730d814 492 edt_ft5x06_work_mode(tsdata);
43c4d13e
SB		 493 }
494
495 mutex_unlock(&tsdata->mutex);
496
497 return retval;
498};
499
500DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
501 edt_ft5x06_debugfs_mode_set, "%llu\n");
502
43c4d13e
SB		 503static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
504 char __user *buf, size_t count, loff_t *off)
505{
506 struct edt_ft5x06_ts_data *tsdata = file->private_data;
507 struct i2c_client *client = tsdata->client;
508 int retries = EDT_RAW_DATA_RETRIES;
509 int val, i, error;
510 size_t read = 0;
511 int colbytes;
512 char wrbuf[3];
513 u8 *rdbuf;
514
515 if (*off < 0 || *off >= tsdata->raw_bufsize)
516 return 0;
517
518 mutex_lock(&tsdata->mutex);
519
520 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
521 error = -EIO;
522 goto out;
523 }
524
525 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
526 if (error) {
527 dev_dbg(&client->dev,
528 "failed to write 0x08 register, error %d\n", error);
529 goto out;
530 }
531
532 do {
533 msleep(EDT_RAW_DATA_DELAY);
534 val = edt_ft5x06_register_read(tsdata, 0x08);
535 if (val < 1)
536 break;
537 } while (--retries > 0);
538
539 if (val < 0) {
540 error = val;
541 dev_dbg(&client->dev,
542 "failed to read 0x08 register, error %d\n", error);
543 goto out;
544 }
545
546 if (retries == 0) {
547 dev_dbg(&client->dev,
548 "timed out waiting for register to settle\n");
549 error = -ETIMEDOUT;
550 goto out;
551 }
552
553 rdbuf = tsdata->raw_buffer;
554 colbytes = tsdata->num_y * sizeof(u16);
555
556 wrbuf[0] = 0xf5;
557 wrbuf[1] = 0x0e;
558 for (i = 0; i < tsdata->num_x; i++) {
559 wrbuf[2] = i; /* column index */
560 error = edt_ft5x06_ts_readwrite(tsdata->client,
561 sizeof(wrbuf), wrbuf,
562 colbytes, rdbuf);
563 if (error)
564 goto out;
565
566 rdbuf += colbytes;
567 }
568
569 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
35b1da4e
AL		 570 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
571 error = -EFAULT;
572 goto out;
573 }
574
575 *off += read;
43c4d13e
SB		 576out:
577 mutex_unlock(&tsdata->mutex);
578 return error ?: read;
579};
580
43c4d13e 581static const struct file_operations debugfs_raw_data_fops = {
f6c0df6a 582 .open = simple_open,
43c4d13e
SB		 583 .read = edt_ft5x06_debugfs_raw_data_read,
584};
585
5298cc4c 586static void
43c4d13e
SB		 587edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
588 const char *debugfs_name)
589{
590 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
591 if (!tsdata->debug_dir)
592 return;
593
594 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
595 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
596
597 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
598 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
599 debugfs_create_file("raw_data", S_IRUSR,
600 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
601}
602
e2619cf7 603static void
43c4d13e
SB		 604edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
605{
606 if (tsdata->debug_dir)
607 debugfs_remove_recursive(tsdata->debug_dir);
a1d0fa77 608 kfree(tsdata->raw_buffer);
43c4d13e
SB		 609}
610
611#else
612
613static inline void
614edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
615 const char *debugfs_name)
616{
617}
618
619static inline void
620edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
621{
622}
623
624#endif /* CONFIG_DEBUGFS */
625
5298cc4c 626static int edt_ft5x06_ts_reset(struct i2c_client *client,
dac90dc2 627 struct edt_ft5x06_ts_data *tsdata)
43c4d13e
SB		 628{
629 int error;
630
dac90dc2
LW		 631 if (gpio_is_valid(tsdata->wake_pin)) {
632 error = devm_gpio_request_one(&client->dev,
633 tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
634 "edt-ft5x06 wake");
635 if (error) {
636 dev_err(&client->dev,
637 "Failed to request GPIO %d as wake pin, error %d\n",
638 tsdata->wake_pin, error);
639 return error;
640 }
641
c0808467 642 msleep(5);
dac90dc2
LW		 643 gpio_set_value(tsdata->wake_pin, 1);
644 }
645 if (gpio_is_valid(tsdata->reset_pin)) {
43c4d13e 646 /* this pulls reset down, enabling the low active reset */
dac90dc2
LW		 647 error = devm_gpio_request_one(&client->dev,
648 tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
649 "edt-ft5x06 reset");
43c4d13e
SB		 650 if (error) {
651 dev_err(&client->dev,
652 "Failed to request GPIO %d as reset pin, error %d\n",
dac90dc2 653 tsdata->reset_pin, error);
43c4d13e
SB		 654 return error;
655 }
656
c0808467 657 msleep(5);
dac90dc2 658 gpio_set_value(tsdata->reset_pin, 1);
c0808467 659 msleep(300);
43c4d13e
SB		 660 }
661
662 return 0;
663}
664
5298cc4c 665static int edt_ft5x06_ts_identify(struct i2c_client *client,
43c4d13e
SB		 666 char *model_name,
667 char *fw_version)
668{
669 u8 rdbuf[EDT_NAME_LEN];
670 char *p;
671 int error;
672
673 error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
674 EDT_NAME_LEN - 1, rdbuf);
675 if (error)
676 return error;
677
678 /* remove last '$' end marker */
679 rdbuf[EDT_NAME_LEN - 1] = '\0';
680 if (rdbuf[EDT_NAME_LEN - 2] == '$')
681 rdbuf[EDT_NAME_LEN - 2] = '\0';
682
683 /* look for Model/Version separator */
684 p = strchr(rdbuf, '*');
685 if (p)
686 *p++ = '\0';
687
688 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
689 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
690
691 return 0;
692}
693
694#define EDT_ATTR_CHECKSET(name, reg) \
695 if (pdata->name >= edt_ft5x06_attr_##name.limit_low && \
696 pdata->name <= edt_ft5x06_attr_##name.limit_high) \
697 edt_ft5x06_register_write(tsdata, reg, pdata->name)
698
dac90dc2
LW		 699#define EDT_GET_PROP(name, reg) { \
700 u32 val; \
701 if (of_property_read_u32(np, #name, &val) == 0) \
702 edt_ft5x06_register_write(tsdata, reg, val); \
703}
704
705static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
706 struct edt_ft5x06_ts_data *tsdata)
707{
708 EDT_GET_PROP(threshold, WORK_REGISTER_THRESHOLD);
709 EDT_GET_PROP(gain, WORK_REGISTER_GAIN);
710 EDT_GET_PROP(offset, WORK_REGISTER_OFFSET);
711}
712
5298cc4c 713static void
43c4d13e
SB		 714edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
715 const struct edt_ft5x06_platform_data *pdata)
716{
717 if (!pdata->use_parameters)
718 return;
719
720 /* pick up defaults from the platform data */
721 EDT_ATTR_CHECKSET(threshold, WORK_REGISTER_THRESHOLD);
722 EDT_ATTR_CHECKSET(gain, WORK_REGISTER_GAIN);
723 EDT_ATTR_CHECKSET(offset, WORK_REGISTER_OFFSET);
724 EDT_ATTR_CHECKSET(report_rate, WORK_REGISTER_REPORT_RATE);
725}
726
5298cc4c 727static void
43c4d13e
SB		 728edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
729{
730 tsdata->threshold = edt_ft5x06_register_read(tsdata,
731 WORK_REGISTER_THRESHOLD);
732 tsdata->gain = edt_ft5x06_register_read(tsdata, WORK_REGISTER_GAIN);
733 tsdata->offset = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OFFSET);
734 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
735 WORK_REGISTER_REPORT_RATE);
736 tsdata->num_x = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_X);
737 tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
738}
739
dac90dc2
LW		 740#ifdef CONFIG_OF
741static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
742 struct edt_ft5x06_ts_data *tsdata)
743{
744 struct device_node *np = dev->of_node;
745
746 /*
747 * irq_pin is not needed for DT setup.
748 * irq is associated via 'interrupts' property in DT
749 */
750 tsdata->irq_pin = -EINVAL;
751 tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
752 tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
753
754 return 0;
755}
756#else
757static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
758 struct edt_ft5x06_ts_data *tsdata)
759{
760 return -ENODEV;
761}
762#endif
763
5298cc4c 764static int edt_ft5x06_ts_probe(struct i2c_client *client,
43c4d13e
SB		 765 const struct i2c_device_id *id)
766{
767 const struct edt_ft5x06_platform_data *pdata =
c838cb3d 768 dev_get_platdata(&client->dev);
43c4d13e
SB		 769 struct edt_ft5x06_ts_data *tsdata;
770 struct input_dev *input;
771 int error;
772 char fw_version[EDT_NAME_LEN];
773
774 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
775
dac90dc2
LW		 776 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
777 if (!tsdata) {
778 dev_err(&client->dev, "failed to allocate driver data.\n");
779 return -ENOMEM;
780 }
781
43c4d13e 782 if (!pdata) {
dac90dc2
LW		 783 error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
784 if (error) {
785 dev_err(&client->dev,
786 "DT probe failed and no platform data present\n");
787 return error;
788 }
789 } else {
790 tsdata->reset_pin = pdata->reset_pin;
791 tsdata->irq_pin = pdata->irq_pin;
792 tsdata->wake_pin = -EINVAL;
43c4d13e
SB		 793 }
794
dac90dc2 795 error = edt_ft5x06_ts_reset(client, tsdata);
43c4d13e
SB		 796 if (error)
797 return error;
798
dac90dc2
LW		 799 if (gpio_is_valid(tsdata->irq_pin)) {
800 error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
801 GPIOF_IN, "edt-ft5x06 irq");
43c4d13e
SB		 802 if (error) {
803 dev_err(&client->dev,
804 "Failed to request GPIO %d, error %d\n",
dac90dc2 805 tsdata->irq_pin, error);
43c4d13e
SB		 806 return error;
807 }
808 }
809
02300bd6
LW		 810 input = devm_input_allocate_device(&client->dev);
811 if (!input) {
812 dev_err(&client->dev, "failed to allocate input device.\n");
813 return -ENOMEM;
43c4d13e
SB		 814 }
815
816 mutex_init(&tsdata->mutex);
817 tsdata->client = client;
818 tsdata->input = input;
819 tsdata->factory_mode = false;
820
821 error = edt_ft5x06_ts_identify(client, tsdata->name, fw_version);
822 if (error) {
823 dev_err(&client->dev, "touchscreen probe failed\n");
02300bd6 824 return error;
43c4d13e
SB		 825 }
826
dac90dc2
LW		 827 if (!pdata)
828 edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
829 else
830 edt_ft5x06_ts_get_defaults(tsdata, pdata);
831
43c4d13e
SB		 832 edt_ft5x06_ts_get_parameters(tsdata);
833
834 dev_dbg(&client->dev,
835 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
836 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
837
838 input->name = tsdata->name;
839 input->id.bustype = BUS_I2C;
840 input->dev.parent = &client->dev;
841
842 __set_bit(EV_SYN, input->evbit);
843 __set_bit(EV_KEY, input->evbit);
844 __set_bit(EV_ABS, input->evbit);
845 __set_bit(BTN_TOUCH, input->keybit);
846 input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
847 input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
848 input_set_abs_params(input, ABS_MT_POSITION_X,
849 0, tsdata->num_x * 64 - 1, 0, 0);
850 input_set_abs_params(input, ABS_MT_POSITION_Y,
851 0, tsdata->num_y * 64 - 1, 0, 0);
b4adbbef 852 error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
43c4d13e
SB		 853 if (error) {
854 dev_err(&client->dev, "Unable to init MT slots.\n");
02300bd6 855 return error;
43c4d13e
SB		 856 }
857
858 input_set_drvdata(input, tsdata);
859 i2c_set_clientdata(client, tsdata);
860
dac90dc2
LW		 861 error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
862 edt_ft5x06_ts_isr,
863 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
864 client->name, tsdata);
43c4d13e
SB		 865 if (error) {
866 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
02300bd6 867 return error;
43c4d13e
SB		 868 }
869
870 error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
871 if (error)
02300bd6 872 return error;
43c4d13e
SB		 873
874 error = input_register_device(input);
dac90dc2
LW		 875 if (error)
876 goto err_remove_attrs;
43c4d13e
SB		 877
878 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
879 device_init_wakeup(&client->dev, 1);
880
881 dev_dbg(&client->dev,
dac90dc2
LW		 882 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
883 client->irq, tsdata->wake_pin, tsdata->reset_pin);
43c4d13e
SB		 884
885 return 0;
dac90dc2
LW		 886
887err_remove_attrs:
888 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
889 return error;
43c4d13e
SB		 890}
891
e2619cf7 892static int edt_ft5x06_ts_remove(struct i2c_client *client)
43c4d13e 893{
43c4d13e
SB		 894 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
895
896 edt_ft5x06_ts_teardown_debugfs(tsdata);
897 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
898
43c4d13e
SB		 899 return 0;
900}
901
902#ifdef CONFIG_PM_SLEEP
903static int edt_ft5x06_ts_suspend(struct device *dev)
904{
905 struct i2c_client *client = to_i2c_client(dev);
906
907 if (device_may_wakeup(dev))
908 enable_irq_wake(client->irq);
909
910 return 0;
911}
912
913static int edt_ft5x06_ts_resume(struct device *dev)
914{
915 struct i2c_client *client = to_i2c_client(dev);
916
917 if (device_may_wakeup(dev))
918 disable_irq_wake(client->irq);
919
920 return 0;
921}
922#endif
923
924static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
925 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
926
927static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1730d814
LW		 928 { "edt-ft5x06", 0, },
929 { /* sentinel */ }
43c4d13e
SB		 930};
931MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
932
dac90dc2
LW		 933#ifdef CONFIG_OF
934static const struct of_device_id edt_ft5x06_of_match[] = {
935 { .compatible = "edt,edt-ft5206", },
936 { .compatible = "edt,edt-ft5306", },
937 { .compatible = "edt,edt-ft5406", },
938 { /* sentinel */ }
939};
940MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
941#endif
942
43c4d13e
SB		 943static struct i2c_driver edt_ft5x06_ts_driver = {
944 .driver = {
945 .owner = THIS_MODULE,
946 .name = "edt_ft5x06",
dac90dc2 947 .of_match_table = of_match_ptr(edt_ft5x06_of_match),
43c4d13e
SB		 948 .pm = &edt_ft5x06_ts_pm_ops,
949 },
950 .id_table = edt_ft5x06_ts_id,
951 .probe = edt_ft5x06_ts_probe,
1cb0aa88 952 .remove = edt_ft5x06_ts_remove,
43c4d13e
SB		 953};
954
955module_i2c_driver(edt_ft5x06_ts_driver);
956
957MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
958MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
959MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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