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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[deliverable/linux.git] / drivers / input / touchscreen / edt-ft5x06.c
CommitLineData
43c4d13e
SB		 1/*
2 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
fd335ab0 3 * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
dac90dc2 4 * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
43c4d13e
SB		 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>
dac90dc2 38#include <linux/of_gpio.h>
43c4d13e
SB		 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
fd335ab0
LW		 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
43c4d13e
SB		 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
fd335ab0
LW		 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
43c4d13e
SB		 87struct edt_ft5x06_ts_data {
88 struct i2c_client *client;
89 struct input_dev *input;
90 u16 num_x;
91 u16 num_y;
92
dac90dc2
LW		 93 int reset_pin;
94 int irq_pin;
95 int wake_pin;
96
43c4d13e
SB		 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];
fd335ab0
LW		 111
112 struct edt_reg_addr reg_addr;
113 enum edt_ver version;
43c4d13e
SB		 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;
fd335ab0
LW		 171 u8 cmd;
172 u8 rdbuf[29];
43c4d13e 173 int i, type, x, y, id;
fd335ab0 174 int offset, tplen, datalen;
43c4d13e
SB		 175 int error;
176
fd335ab0
LW		 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
43c4d13e
SB		 196 memset(rdbuf, 0, sizeof(rdbuf));
197
198 error = edt_ft5x06_ts_readwrite(tsdata->client,
199 sizeof(cmd), &cmd,
fd335ab0 200 datalen, rdbuf);
43c4d13e
SB		 201 if (error) {
202 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
203 error);
204 goto out;
205 }
206
fd335ab0
LW		 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 }
43c4d13e 216
fd335ab0
LW		 217 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen))
218 goto out;
219 }
43c4d13e
SB		 220
221 for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
fd335ab0 222 u8 *buf = &rdbuf[i * tplen + offset];
43c4d13e
SB		 223 bool down;
224
225 type = buf[0] >> 6;
226 /* ignore Reserved events */
227 if (type == TOUCH_EVENT_RESERVED)
228 continue;
229
fd335ab0
LW		 230 /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
231 if (tsdata->version == M06 && type == TOUCH_EVENT_DOWN)
ee3e946e
LW		 232 continue;
233
43c4d13e
SB		 234 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
235 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
236 id = (buf[2] >> 4) & 0x0f;
1730d814 237 down = type != TOUCH_EVENT_UP;
43c4d13e
SB		 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
fd335ab0
LW		 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;
fd335ab0
LW		 265 wrbuf[2] = value;
266 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
267 return edt_ft5x06_ts_readwrite(tsdata->client, 4,
268 wrbuf, 0, NULL);
269 case M09:
270 wrbuf[0] = addr;
271 wrbuf[1] = value;
272
cc071aca 273 return edt_ft5x06_ts_readwrite(tsdata->client, 2,
fd335ab0
LW		 274 wrbuf, 0, NULL);
275
276 default:
277 return -EINVAL;
278 }
43c4d13e
SB		 279}
280
281static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
282 u8 addr)
283{
284 u8 wrbuf[2], rdbuf[2];
285 int error;
286
fd335ab0
LW		 287 switch (tsdata->version) {
288 case M06:
289 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
290 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
291 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
43c4d13e 292
e2c3ecf0
DC		 293 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2,
294 rdbuf);
295 if (error)
296 return error;
43c4d13e 297
fd335ab0
LW		 298 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
299 dev_err(&tsdata->client->dev,
300 "crc error: 0x%02x expected, got 0x%02x\n",
301 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0],
302 rdbuf[1]);
303 return -EIO;
304 }
305 break;
306
307 case M09:
308 wrbuf[0] = addr;
309 error = edt_ft5x06_ts_readwrite(tsdata->client, 1,
310 wrbuf, 1, rdbuf);
311 if (error)
312 return error;
313 break;
314
315 default:
316 return -EINVAL;
43c4d13e
SB		 317 }
318
319 return rdbuf[0];
320}
321
322struct edt_ft5x06_attribute {
323 struct device_attribute dattr;
324 size_t field_offset;
325 u8 limit_low;
326 u8 limit_high;
fd335ab0
LW		 327 u8 addr_m06;
328 u8 addr_m09;
43c4d13e
SB		 329};
330
fd335ab0
LW		 331#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, \
332 _limit_low, _limit_high) \
43c4d13e
SB		 333 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
334 .dattr = __ATTR(_field, _mode, \
335 edt_ft5x06_setting_show, \
336 edt_ft5x06_setting_store), \
fd335ab0
LW		 337 .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
338 .addr_m06 = _addr_m06, \
339 .addr_m09 = _addr_m09, \
43c4d13e
SB		 340 .limit_low = _limit_low, \
341 .limit_high = _limit_high, \
43c4d13e
SB		 342 }
343
344static ssize_t edt_ft5x06_setting_show(struct device *dev,
345 struct device_attribute *dattr,
346 char *buf)
347{
348 struct i2c_client *client = to_i2c_client(dev);
349 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
350 struct edt_ft5x06_attribute *attr =
351 container_of(dattr, struct edt_ft5x06_attribute, dattr);
1730d814 352 u8 *field = (u8 *)tsdata + attr->field_offset;
43c4d13e
SB		 353 int val;
354 size_t count = 0;
355 int error = 0;
fd335ab0 356 u8 addr;
43c4d13e
SB		 357
358 mutex_lock(&tsdata->mutex);
359
360 if (tsdata->factory_mode) {
361 error = -EIO;
362 goto out;
363 }
364
fd335ab0
LW		 365 switch (tsdata->version) {
366 case M06:
367 addr = attr->addr_m06;
368 break;
369
370 case M09:
371 addr = attr->addr_m09;
372 break;
373
374 default:
375 error = -ENODEV;
43c4d13e
SB		 376 goto out;
377 }
378
fd335ab0
LW		 379 if (addr != NO_REGISTER) {
380 val = edt_ft5x06_register_read(tsdata, addr);
381 if (val < 0) {
382 error = val;
383 dev_err(&tsdata->client->dev,
384 "Failed to fetch attribute %s, error %d\n",
385 dattr->attr.name, error);
386 goto out;
387 }
388 } else {
389 val = *field;
390 }
391
43c4d13e
SB		 392 if (val != *field) {
393 dev_warn(&tsdata->client->dev,
394 "%s: read (%d) and stored value (%d) differ\n",
395 dattr->attr.name, val, *field);
396 *field = val;
397 }
398
399 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
400out:
401 mutex_unlock(&tsdata->mutex);
402 return error ?: count;
403}
404
405static ssize_t edt_ft5x06_setting_store(struct device *dev,
406 struct device_attribute *dattr,
407 const char *buf, size_t count)
408{
409 struct i2c_client *client = to_i2c_client(dev);
410 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
411 struct edt_ft5x06_attribute *attr =
412 container_of(dattr, struct edt_ft5x06_attribute, dattr);
1730d814 413 u8 *field = (u8 *)tsdata + attr->field_offset;
43c4d13e
SB		 414 unsigned int val;
415 int error;
fd335ab0 416 u8 addr;
43c4d13e
SB		 417
418 mutex_lock(&tsdata->mutex);
419
420 if (tsdata->factory_mode) {
421 error = -EIO;
422 goto out;
423 }
424
425 error = kstrtouint(buf, 0, &val);
426 if (error)
427 goto out;
428
429 if (val < attr->limit_low || val > attr->limit_high) {
430 error = -ERANGE;
431 goto out;
432 }
433
fd335ab0
LW		 434 switch (tsdata->version) {
435 case M06:
436 addr = attr->addr_m06;
437 break;
438
439 case M09:
440 addr = attr->addr_m09;
441 break;
442
443 default:
444 error = -ENODEV;
43c4d13e
SB		 445 goto out;
446 }
447
fd335ab0
LW		 448 if (addr != NO_REGISTER) {
449 error = edt_ft5x06_register_write(tsdata, addr, val);
450 if (error) {
451 dev_err(&tsdata->client->dev,
452 "Failed to update attribute %s, error: %d\n",
453 dattr->attr.name, error);
454 goto out;
455 }
456 }
43c4d13e
SB		 457 *field = val;
458
459out:
460 mutex_unlock(&tsdata->mutex);
461 return error ?: count;
462}
463
fd335ab0
LW		 464static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
465 M09_REGISTER_GAIN, 0, 31);
466static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
467 M09_REGISTER_OFFSET, 0, 31);
468static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
469 M09_REGISTER_THRESHOLD, 20, 80);
470static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
471 NO_REGISTER, 3, 14);
43c4d13e
SB		 472
473static struct attribute *edt_ft5x06_attrs[] = {
474 &edt_ft5x06_attr_gain.dattr.attr,
475 &edt_ft5x06_attr_offset.dattr.attr,
476 &edt_ft5x06_attr_threshold.dattr.attr,
477 &edt_ft5x06_attr_report_rate.dattr.attr,
478 NULL
479};
480
481static const struct attribute_group edt_ft5x06_attr_group = {
482 .attrs = edt_ft5x06_attrs,
483};
484
485#ifdef CONFIG_DEBUG_FS
486static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
487{
488 struct i2c_client *client = tsdata->client;
489 int retries = EDT_SWITCH_MODE_RETRIES;
490 int ret;
491 int error;
492
493 disable_irq(client->irq);
494
495 if (!tsdata->raw_buffer) {
496 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
497 sizeof(u16);
498 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
499 if (!tsdata->raw_buffer) {
500 error = -ENOMEM;
501 goto err_out;
502 }
503 }
504
505 /* mode register is 0x3c when in the work mode */
fd335ab0
LW		 506 if (tsdata->version == M09)
507 goto m09_out;
508
43c4d13e
SB		 509 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
510 if (error) {
511 dev_err(&client->dev,
512 "failed to switch to factory mode, error %d\n", error);
513 goto err_out;
514 }
515
516 tsdata->factory_mode = true;
517 do {
518 mdelay(EDT_SWITCH_MODE_DELAY);
519 /* mode register is 0x01 when in factory mode */
520 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
521 if (ret == 0x03)
522 break;
523 } while (--retries > 0);
524
525 if (retries == 0) {
526 dev_err(&client->dev, "not in factory mode after %dms.\n",
527 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
528 error = -EIO;
529 goto err_out;
530 }
531
532 return 0;
533
534err_out:
535 kfree(tsdata->raw_buffer);
536 tsdata->raw_buffer = NULL;
537 tsdata->factory_mode = false;
538 enable_irq(client->irq);
539
540 return error;
fd335ab0
LW		 541
542m09_out:
543 dev_err(&client->dev, "No factory mode support for M09\n");
544 return -EINVAL;
545
43c4d13e
SB		 546}
547
548static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
549{
550 struct i2c_client *client = tsdata->client;
551 int retries = EDT_SWITCH_MODE_RETRIES;
fd335ab0 552 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
43c4d13e
SB		 553 int ret;
554 int error;
555
556 /* mode register is 0x01 when in the factory mode */
557 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
558 if (error) {
559 dev_err(&client->dev,
560 "failed to switch to work mode, error: %d\n", error);
561 return error;
562 }
563
564 tsdata->factory_mode = false;
565
566 do {
567 mdelay(EDT_SWITCH_MODE_DELAY);
568 /* mode register is 0x01 when in factory mode */
569 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
570 if (ret == 0x01)
571 break;
572 } while (--retries > 0);
573
574 if (retries == 0) {
575 dev_err(&client->dev, "not in work mode after %dms.\n",
576 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
577 tsdata->factory_mode = true;
578 return -EIO;
579 }
580
8efcc503 581 kfree(tsdata->raw_buffer);
43c4d13e
SB		 582 tsdata->raw_buffer = NULL;
583
584 /* restore parameters */
fd335ab0 585 edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
43c4d13e 586 tsdata->threshold);
fd335ab0 587 edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
43c4d13e 588 tsdata->gain);
fd335ab0 589 edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
43c4d13e 590 tsdata->offset);
fd335ab0
LW		 591 if (reg_addr->reg_report_rate)
592 edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate,
43c4d13e
SB		 593 tsdata->report_rate);
594
595 enable_irq(client->irq);
596
597 return 0;
598}
599
600static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
601{
602 struct edt_ft5x06_ts_data *tsdata = data;
603
604 *mode = tsdata->factory_mode;
605
606 return 0;
607};
608
609static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
610{
611 struct edt_ft5x06_ts_data *tsdata = data;
612 int retval = 0;
613
614 if (mode > 1)
615 return -ERANGE;
616
617 mutex_lock(&tsdata->mutex);
618
619 if (mode != tsdata->factory_mode) {
620 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
1730d814 621 edt_ft5x06_work_mode(tsdata);
43c4d13e
SB		 622 }
623
624 mutex_unlock(&tsdata->mutex);
625
626 return retval;
627};
628
629DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
630 edt_ft5x06_debugfs_mode_set, "%llu\n");
631
43c4d13e
SB		 632static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
633 char __user *buf, size_t count, loff_t *off)
634{
635 struct edt_ft5x06_ts_data *tsdata = file->private_data;
636 struct i2c_client *client = tsdata->client;
637 int retries = EDT_RAW_DATA_RETRIES;
638 int val, i, error;
639 size_t read = 0;
640 int colbytes;
641 char wrbuf[3];
642 u8 *rdbuf;
643
644 if (*off < 0 || *off >= tsdata->raw_bufsize)
645 return 0;
646
647 mutex_lock(&tsdata->mutex);
648
649 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
650 error = -EIO;
651 goto out;
652 }
653
654 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
655 if (error) {
656 dev_dbg(&client->dev,
657 "failed to write 0x08 register, error %d\n", error);
658 goto out;
659 }
660
661 do {
662 msleep(EDT_RAW_DATA_DELAY);
663 val = edt_ft5x06_register_read(tsdata, 0x08);
664 if (val < 1)
665 break;
666 } while (--retries > 0);
667
668 if (val < 0) {
669 error = val;
670 dev_dbg(&client->dev,
671 "failed to read 0x08 register, error %d\n", error);
672 goto out;
673 }
674
675 if (retries == 0) {
676 dev_dbg(&client->dev,
677 "timed out waiting for register to settle\n");
678 error = -ETIMEDOUT;
679 goto out;
680 }
681
682 rdbuf = tsdata->raw_buffer;
683 colbytes = tsdata->num_y * sizeof(u16);
684
685 wrbuf[0] = 0xf5;
686 wrbuf[1] = 0x0e;
687 for (i = 0; i < tsdata->num_x; i++) {
688 wrbuf[2] = i; /* column index */
689 error = edt_ft5x06_ts_readwrite(tsdata->client,
690 sizeof(wrbuf), wrbuf,
691 colbytes, rdbuf);
692 if (error)
693 goto out;
694
695 rdbuf += colbytes;
696 }
697
698 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
35b1da4e
AL		 699 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
700 error = -EFAULT;
701 goto out;
702 }
703
704 *off += read;
43c4d13e
SB		 705out:
706 mutex_unlock(&tsdata->mutex);
707 return error ?: read;
708};
709
43c4d13e 710static const struct file_operations debugfs_raw_data_fops = {
f6c0df6a 711 .open = simple_open,
43c4d13e
SB		 712 .read = edt_ft5x06_debugfs_raw_data_read,
713};
714
5298cc4c 715static void
43c4d13e
SB		 716edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
717 const char *debugfs_name)
718{
719 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
720 if (!tsdata->debug_dir)
721 return;
722
723 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
724 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
725
726 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
727 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
728 debugfs_create_file("raw_data", S_IRUSR,
729 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
730}
731
e2619cf7 732static void
43c4d13e
SB		 733edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
734{
f69c6ec2 735 debugfs_remove_recursive(tsdata->debug_dir);
a1d0fa77 736 kfree(tsdata->raw_buffer);
43c4d13e
SB		 737}
738
739#else
740
741static inline void
742edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
743 const char *debugfs_name)
744{
745}
746
747static inline void
748edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
749{
750}
751
752#endif /* CONFIG_DEBUGFS */
753
5298cc4c 754static int edt_ft5x06_ts_reset(struct i2c_client *client,
dac90dc2 755 struct edt_ft5x06_ts_data *tsdata)
43c4d13e
SB		 756{
757 int error;
758
dac90dc2
LW		 759 if (gpio_is_valid(tsdata->wake_pin)) {
760 error = devm_gpio_request_one(&client->dev,
761 tsdata->wake_pin, GPIOF_OUT_INIT_LOW,
762 "edt-ft5x06 wake");
763 if (error) {
764 dev_err(&client->dev,
765 "Failed to request GPIO %d as wake pin, error %d\n",
766 tsdata->wake_pin, error);
767 return error;
768 }
769
c0808467 770 msleep(5);
dac90dc2
LW		 771 gpio_set_value(tsdata->wake_pin, 1);
772 }
773 if (gpio_is_valid(tsdata->reset_pin)) {
43c4d13e 774 /* this pulls reset down, enabling the low active reset */
dac90dc2
LW		 775 error = devm_gpio_request_one(&client->dev,
776 tsdata->reset_pin, GPIOF_OUT_INIT_LOW,
777 "edt-ft5x06 reset");
43c4d13e
SB		 778 if (error) {
779 dev_err(&client->dev,
780 "Failed to request GPIO %d as reset pin, error %d\n",
dac90dc2 781 tsdata->reset_pin, error);
43c4d13e
SB		 782 return error;
783 }
784
c0808467 785 msleep(5);
dac90dc2 786 gpio_set_value(tsdata->reset_pin, 1);
c0808467 787 msleep(300);
43c4d13e
SB		 788 }
789
790 return 0;
791}
792
5298cc4c 793static int edt_ft5x06_ts_identify(struct i2c_client *client,
fd335ab0
LW		 794 struct edt_ft5x06_ts_data *tsdata,
795 char *fw_version)
43c4d13e
SB		 796{
797 u8 rdbuf[EDT_NAME_LEN];
798 char *p;
799 int error;
fd335ab0 800 char *model_name = tsdata->name;
43c4d13e 801
fd335ab0
LW		 802 /* see what we find if we assume it is a M06 *
803 * if we get less than EDT_NAME_LEN, we don't want
804 * to have garbage in there
805 */
806 memset(rdbuf, 0, sizeof(rdbuf));
43c4d13e
SB		 807 error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
808 EDT_NAME_LEN - 1, rdbuf);
809 if (error)
810 return error;
811
fd335ab0
LW		 812 /* if we find something consistent, stay with that assumption
813 * at least M09 won't send 3 bytes here
814 */
0f3ae5ba 815 if (!(strncasecmp(rdbuf + 1, "EP0", 3))) {
fd335ab0
LW		 816 tsdata->version = M06;
817
818 /* remove last '$' end marker */
819 rdbuf[EDT_NAME_LEN - 1] = '\0';
820 if (rdbuf[EDT_NAME_LEN - 2] == '$')
821 rdbuf[EDT_NAME_LEN - 2] = '\0';
822
823 /* look for Model/Version separator */
824 p = strchr(rdbuf, '*');
825 if (p)
826 *p++ = '\0';
827 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
828 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
829 } else {
830 /* since there are only two versions around (M06, M09) */
831 tsdata->version = M09;
832
833 error = edt_ft5x06_ts_readwrite(client, 1, "\xA6",
834 2, rdbuf);
835 if (error)
836 return error;
43c4d13e 837
fd335ab0 838 strlcpy(fw_version, rdbuf, 2);
43c4d13e 839
fd335ab0
LW		 840 error = edt_ft5x06_ts_readwrite(client, 1, "\xA8",
841 1, rdbuf);
842 if (error)
843 return error;
844
845 snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
846 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
847 }
43c4d13e
SB		 848
849 return 0;
850}
851
852#define EDT_ATTR_CHECKSET(name, reg) \
853 if (pdata->name >= edt_ft5x06_attr_##name.limit_low && \
854 pdata->name <= edt_ft5x06_attr_##name.limit_high) \
855 edt_ft5x06_register_write(tsdata, reg, pdata->name)
856
dac90dc2
LW		 857#define EDT_GET_PROP(name, reg) { \
858 u32 val; \
859 if (of_property_read_u32(np, #name, &val) == 0) \
860 edt_ft5x06_register_write(tsdata, reg, val); \
861}
862
863static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
864 struct edt_ft5x06_ts_data *tsdata)
865{
fd335ab0
LW		 866 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
867
868 EDT_GET_PROP(threshold, reg_addr->reg_threshold);
869 EDT_GET_PROP(gain, reg_addr->reg_gain);
870 EDT_GET_PROP(offset, reg_addr->reg_offset);
dac90dc2
LW		 871}
872
5298cc4c 873static void
43c4d13e
SB		 874edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
875 const struct edt_ft5x06_platform_data *pdata)
876{
fd335ab0
LW		 877 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
878
43c4d13e
SB		 879 if (!pdata->use_parameters)
880 return;
881
882 /* pick up defaults from the platform data */
fd335ab0
LW		 883 EDT_ATTR_CHECKSET(threshold, reg_addr->reg_threshold);
884 EDT_ATTR_CHECKSET(gain, reg_addr->reg_gain);
885 EDT_ATTR_CHECKSET(offset, reg_addr->reg_offset);
886 if (reg_addr->reg_report_rate != NO_REGISTER)
887 EDT_ATTR_CHECKSET(report_rate, reg_addr->reg_report_rate);
43c4d13e
SB		 888}
889
5298cc4c 890static void
43c4d13e
SB		 891edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
892{
fd335ab0
LW		 893 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
894
43c4d13e 895 tsdata->threshold = edt_ft5x06_register_read(tsdata,
fd335ab0
LW		 896 reg_addr->reg_threshold);
897 tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain);
898 tsdata->offset = edt_ft5x06_register_read(tsdata, reg_addr->reg_offset);
899 if (reg_addr->reg_report_rate != NO_REGISTER)
900 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
901 reg_addr->reg_report_rate);
902 tsdata->num_x = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_x);
903 tsdata->num_y = edt_ft5x06_register_read(tsdata, reg_addr->reg_num_y);
904}
905
906static void
907edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
908{
909 struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
910
911 switch (tsdata->version) {
912 case M06:
913 reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
914 reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
915 reg_addr->reg_gain = WORK_REGISTER_GAIN;
916 reg_addr->reg_offset = WORK_REGISTER_OFFSET;
917 reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
918 reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
919 break;
920
921 case M09:
922 reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
923 reg_addr->reg_gain = M09_REGISTER_GAIN;
924 reg_addr->reg_offset = M09_REGISTER_OFFSET;
925 reg_addr->reg_num_x = M09_REGISTER_NUM_X;
926 reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
927 break;
928 }
43c4d13e
SB		 929}
930
dac90dc2
LW		 931#ifdef CONFIG_OF
932static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
933 struct edt_ft5x06_ts_data *tsdata)
934{
935 struct device_node *np = dev->of_node;
936
937 /*
938 * irq_pin is not needed for DT setup.
939 * irq is associated via 'interrupts' property in DT
940 */
941 tsdata->irq_pin = -EINVAL;
942 tsdata->reset_pin = of_get_named_gpio(np, "reset-gpios", 0);
943 tsdata->wake_pin = of_get_named_gpio(np, "wake-gpios", 0);
944
945 return 0;
946}
947#else
948static inline int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
949 struct edt_ft5x06_ts_data *tsdata)
950{
951 return -ENODEV;
952}
953#endif
954
5298cc4c 955static int edt_ft5x06_ts_probe(struct i2c_client *client,
43c4d13e
SB		 956 const struct i2c_device_id *id)
957{
958 const struct edt_ft5x06_platform_data *pdata =
c838cb3d 959 dev_get_platdata(&client->dev);
43c4d13e
SB		 960 struct edt_ft5x06_ts_data *tsdata;
961 struct input_dev *input;
962 int error;
963 char fw_version[EDT_NAME_LEN];
964
965 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
966
dac90dc2
LW		 967 tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
968 if (!tsdata) {
969 dev_err(&client->dev, "failed to allocate driver data.\n");
970 return -ENOMEM;
971 }
972
43c4d13e 973 if (!pdata) {
dac90dc2
LW		 974 error = edt_ft5x06_i2c_ts_probe_dt(&client->dev, tsdata);
975 if (error) {
976 dev_err(&client->dev,
977 "DT probe failed and no platform data present\n");
978 return error;
979 }
980 } else {
981 tsdata->reset_pin = pdata->reset_pin;
982 tsdata->irq_pin = pdata->irq_pin;
983 tsdata->wake_pin = -EINVAL;
43c4d13e
SB		 984 }
985
dac90dc2 986 error = edt_ft5x06_ts_reset(client, tsdata);
43c4d13e
SB		 987 if (error)
988 return error;
989
dac90dc2
LW		 990 if (gpio_is_valid(tsdata->irq_pin)) {
991 error = devm_gpio_request_one(&client->dev, tsdata->irq_pin,
992 GPIOF_IN, "edt-ft5x06 irq");
43c4d13e
SB		 993 if (error) {
994 dev_err(&client->dev,
995 "Failed to request GPIO %d, error %d\n",
dac90dc2 996 tsdata->irq_pin, error);
43c4d13e
SB		 997 return error;
998 }
999 }
1000
02300bd6
LW		 1001 input = devm_input_allocate_device(&client->dev);
1002 if (!input) {
1003 dev_err(&client->dev, "failed to allocate input device.\n");
1004 return -ENOMEM;
43c4d13e
SB		 1005 }
1006
1007 mutex_init(&tsdata->mutex);
1008 tsdata->client = client;
1009 tsdata->input = input;
1010 tsdata->factory_mode = false;
1011
fd335ab0 1012 error = edt_ft5x06_ts_identify(client, tsdata, fw_version);
43c4d13e
SB		 1013 if (error) {
1014 dev_err(&client->dev, "touchscreen probe failed\n");
02300bd6 1015 return error;
43c4d13e
SB		 1016 }
1017
fd335ab0
LW		 1018 edt_ft5x06_ts_set_regs(tsdata);
1019
dac90dc2
LW		 1020 if (!pdata)
1021 edt_ft5x06_ts_get_dt_defaults(client->dev.of_node, tsdata);
1022 else
1023 edt_ft5x06_ts_get_defaults(tsdata, pdata);
1024
43c4d13e
SB		 1025 edt_ft5x06_ts_get_parameters(tsdata);
1026
1027 dev_dbg(&client->dev,
1028 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
1029 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
1030
1031 input->name = tsdata->name;
1032 input->id.bustype = BUS_I2C;
1033 input->dev.parent = &client->dev;
1034
1035 __set_bit(EV_SYN, input->evbit);
1036 __set_bit(EV_KEY, input->evbit);
1037 __set_bit(EV_ABS, input->evbit);
1038 __set_bit(BTN_TOUCH, input->keybit);
1039 input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
1040 input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
1041 input_set_abs_params(input, ABS_MT_POSITION_X,
1042 0, tsdata->num_x * 64 - 1, 0, 0);
1043 input_set_abs_params(input, ABS_MT_POSITION_Y,
1044 0, tsdata->num_y * 64 - 1, 0, 0);
b4adbbef 1045 error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
43c4d13e
SB		 1046 if (error) {
1047 dev_err(&client->dev, "Unable to init MT slots.\n");
02300bd6 1048 return error;
43c4d13e
SB		 1049 }
1050
1051 input_set_drvdata(input, tsdata);
1052 i2c_set_clientdata(client, tsdata);
1053
dac90dc2
LW		 1054 error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
1055 edt_ft5x06_ts_isr,
1056 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1057 client->name, tsdata);
43c4d13e
SB		 1058 if (error) {
1059 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
02300bd6 1060 return error;
43c4d13e
SB		 1061 }
1062
1063 error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1064 if (error)
02300bd6 1065 return error;
43c4d13e
SB		 1066
1067 error = input_register_device(input);
dac90dc2
LW		 1068 if (error)
1069 goto err_remove_attrs;
43c4d13e
SB		 1070
1071 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
1072 device_init_wakeup(&client->dev, 1);
1073
1074 dev_dbg(&client->dev,
dac90dc2
LW		 1075 "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
1076 client->irq, tsdata->wake_pin, tsdata->reset_pin);
43c4d13e
SB		 1077
1078 return 0;
dac90dc2
LW		 1079
1080err_remove_attrs:
1081 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1082 return error;
43c4d13e
SB		 1083}
1084
e2619cf7 1085static int edt_ft5x06_ts_remove(struct i2c_client *client)
43c4d13e 1086{
43c4d13e
SB		 1087 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
1088
1089 edt_ft5x06_ts_teardown_debugfs(tsdata);
1090 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
1091
43c4d13e
SB		 1092 return 0;
1093}
1094
02b6a58b 1095static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
43c4d13e
SB		 1096{
1097 struct i2c_client *client = to_i2c_client(dev);
1098
1099 if (device_may_wakeup(dev))
1100 enable_irq_wake(client->irq);
1101
1102 return 0;
1103}
1104
02b6a58b 1105static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
43c4d13e
SB		 1106{
1107 struct i2c_client *client = to_i2c_client(dev);
1108
1109 if (device_may_wakeup(dev))
1110 disable_irq_wake(client->irq);
1111
1112 return 0;
1113}
43c4d13e
SB		 1114
1115static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
1116 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
1117
1118static const struct i2c_device_id edt_ft5x06_ts_id[] = {
1730d814
LW		 1119 { "edt-ft5x06", 0, },
1120 { /* sentinel */ }
43c4d13e
SB		 1121};
1122MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
1123
dac90dc2
LW		 1124#ifdef CONFIG_OF
1125static const struct of_device_id edt_ft5x06_of_match[] = {
1126 { .compatible = "edt,edt-ft5206", },
1127 { .compatible = "edt,edt-ft5306", },
1128 { .compatible = "edt,edt-ft5406", },
1129 { /* sentinel */ }
1130};
1131MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);
1132#endif
1133
43c4d13e
SB		 1134static struct i2c_driver edt_ft5x06_ts_driver = {
1135 .driver = {
1136 .owner = THIS_MODULE,
1137 .name = "edt_ft5x06",
dac90dc2 1138 .of_match_table = of_match_ptr(edt_ft5x06_of_match),
43c4d13e
SB		 1139 .pm = &edt_ft5x06_ts_pm_ops,
1140 },
1141 .id_table = edt_ft5x06_ts_id,
1142 .probe = edt_ft5x06_ts_probe,
1cb0aa88 1143 .remove = edt_ft5x06_ts_remove,
43c4d13e
SB		 1144};
1145
1146module_i2c_driver(edt_ft5x06_ts_driver);
1147
1148MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
1149MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
1150MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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