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[deliverable/linux.git] / drivers / input / touchscreen / edt-ft5x06.c
CommitLineData
43c4d13e
SB		 1/*
2 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
18/*
19 * This is a driver for the EDT "Polytouch" family of touch controllers
20 * based on the FocalTech FT5x06 line of chips.
21 *
22 * Development of this driver has been sponsored by Glyn:
23 * http://www.glyn.com/Products/Displays
24 */
25
26#include <linux/module.h>
27#include <linux/ratelimit.h>
28#include <linux/interrupt.h>
29#include <linux/input.h>
30#include <linux/i2c.h>
31#include <linux/uaccess.h>
32#include <linux/delay.h>
33#include <linux/debugfs.h>
34#include <linux/slab.h>
35#include <linux/gpio.h>
36#include <linux/input/mt.h>
37#include <linux/input/edt-ft5x06.h>
38
39#define MAX_SUPPORT_POINTS 5
40
41#define WORK_REGISTER_THRESHOLD 0x00
42#define WORK_REGISTER_REPORT_RATE 0x08
43#define WORK_REGISTER_GAIN 0x30
44#define WORK_REGISTER_OFFSET 0x31
45#define WORK_REGISTER_NUM_X 0x33
46#define WORK_REGISTER_NUM_Y 0x34
47
48#define WORK_REGISTER_OPMODE 0x3c
49#define FACTORY_REGISTER_OPMODE 0x01
50
51#define TOUCH_EVENT_DOWN 0x00
52#define TOUCH_EVENT_UP 0x01
53#define TOUCH_EVENT_ON 0x02
54#define TOUCH_EVENT_RESERVED 0x03
55
56#define EDT_NAME_LEN 23
57#define EDT_SWITCH_MODE_RETRIES 10
58#define EDT_SWITCH_MODE_DELAY 5 /* msec */
59#define EDT_RAW_DATA_RETRIES 100
60#define EDT_RAW_DATA_DELAY 1 /* msec */
61
62struct edt_ft5x06_ts_data {
63 struct i2c_client *client;
64 struct input_dev *input;
65 u16 num_x;
66 u16 num_y;
67
68#if defined(CONFIG_DEBUG_FS)
69 struct dentry *debug_dir;
70 u8 *raw_buffer;
71 size_t raw_bufsize;
72#endif
73
74 struct mutex mutex;
75 bool factory_mode;
76 int threshold;
77 int gain;
78 int offset;
79 int report_rate;
80
81 char name[EDT_NAME_LEN];
82};
83
84static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
85 u16 wr_len, u8 *wr_buf,
86 u16 rd_len, u8 *rd_buf)
87{
88 struct i2c_msg wrmsg[2];
89 int i = 0;
90 int ret;
91
92 if (wr_len) {
93 wrmsg[i].addr = client->addr;
94 wrmsg[i].flags = 0;
95 wrmsg[i].len = wr_len;
96 wrmsg[i].buf = wr_buf;
97 i++;
98 }
99 if (rd_len) {
100 wrmsg[i].addr = client->addr;
101 wrmsg[i].flags = I2C_M_RD;
102 wrmsg[i].len = rd_len;
103 wrmsg[i].buf = rd_buf;
104 i++;
105 }
106
107 ret = i2c_transfer(client->adapter, wrmsg, i);
108 if (ret < 0)
109 return ret;
110 if (ret != i)
111 return -EIO;
112
113 return 0;
114}
115
116static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
117 u8 *buf, int buflen)
118{
119 int i;
120 u8 crc = 0;
121
122 for (i = 0; i < buflen - 1; i++)
123 crc ^= buf[i];
124
125 if (crc != buf[buflen-1]) {
126 dev_err_ratelimited(&tsdata->client->dev,
127 "crc error: 0x%02x expected, got 0x%02x\n",
128 crc, buf[buflen-1]);
129 return false;
130 }
131
132 return true;
133}
134
135static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
136{
137 struct edt_ft5x06_ts_data *tsdata = dev_id;
138 struct device *dev = &tsdata->client->dev;
139 u8 cmd = 0xf9;
140 u8 rdbuf[26];
141 int i, type, x, y, id;
142 int error;
143
144 memset(rdbuf, 0, sizeof(rdbuf));
145
146 error = edt_ft5x06_ts_readwrite(tsdata->client,
147 sizeof(cmd), &cmd,
148 sizeof(rdbuf), rdbuf);
149 if (error) {
150 dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
151 error);
152 goto out;
153 }
154
155 if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || rdbuf[2] != 26) {
156 dev_err_ratelimited(dev, "Unexpected header: %02x%02x%02x!\n",
157 rdbuf[0], rdbuf[1], rdbuf[2]);
158 goto out;
159 }
160
161 if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, 26))
162 goto out;
163
164 for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
165 u8 *buf = &rdbuf[i * 4 + 5];
166 bool down;
167
168 type = buf[0] >> 6;
169 /* ignore Reserved events */
170 if (type == TOUCH_EVENT_RESERVED)
171 continue;
172
173 x = ((buf[0] << 8) | buf[1]) & 0x0fff;
174 y = ((buf[2] << 8) | buf[3]) & 0x0fff;
175 id = (buf[2] >> 4) & 0x0f;
176 down = (type != TOUCH_EVENT_UP);
177
178 input_mt_slot(tsdata->input, id);
179 input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);
180
181 if (!down)
182 continue;
183
184 input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
185 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
186 }
187
188 input_mt_report_pointer_emulation(tsdata->input, true);
189 input_sync(tsdata->input);
190
191out:
192 return IRQ_HANDLED;
193}
194
195static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
196 u8 addr, u8 value)
197{
198 u8 wrbuf[4];
199
200 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
201 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
202 wrbuf[2] = value;
203 wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];
204
205 return edt_ft5x06_ts_readwrite(tsdata->client, 4, wrbuf, 0, NULL);
206}
207
208static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
209 u8 addr)
210{
211 u8 wrbuf[2], rdbuf[2];
212 int error;
213
214 wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
215 wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
216 wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
217
218 error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2, rdbuf);
219 if (error)
220 return error;
221
222 if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
223 dev_err(&tsdata->client->dev,
224 "crc error: 0x%02x expected, got 0x%02x\n",
225 wrbuf[0] ^ wrbuf[1] ^ rdbuf[0], rdbuf[1]);
226 return -EIO;
227 }
228
229 return rdbuf[0];
230}
231
232struct edt_ft5x06_attribute {
233 struct device_attribute dattr;
234 size_t field_offset;
235 u8 limit_low;
236 u8 limit_high;
237 u8 addr;
238};
239
240#define EDT_ATTR(_field, _mode, _addr, _limit_low, _limit_high) \
241 struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \
242 .dattr = __ATTR(_field, _mode, \
243 edt_ft5x06_setting_show, \
244 edt_ft5x06_setting_store), \
245 .field_offset = \
246 offsetof(struct edt_ft5x06_ts_data, _field), \
247 .limit_low = _limit_low, \
248 .limit_high = _limit_high, \
249 .addr = _addr, \
250 }
251
252static ssize_t edt_ft5x06_setting_show(struct device *dev,
253 struct device_attribute *dattr,
254 char *buf)
255{
256 struct i2c_client *client = to_i2c_client(dev);
257 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
258 struct edt_ft5x06_attribute *attr =
259 container_of(dattr, struct edt_ft5x06_attribute, dattr);
260 u8 *field = (u8 *)((char *)tsdata + attr->field_offset);
261 int val;
262 size_t count = 0;
263 int error = 0;
264
265 mutex_lock(&tsdata->mutex);
266
267 if (tsdata->factory_mode) {
268 error = -EIO;
269 goto out;
270 }
271
272 val = edt_ft5x06_register_read(tsdata, attr->addr);
273 if (val < 0) {
274 error = val;
275 dev_err(&tsdata->client->dev,
276 "Failed to fetch attribute %s, error %d\n",
277 dattr->attr.name, error);
278 goto out;
279 }
280
281 if (val != *field) {
282 dev_warn(&tsdata->client->dev,
283 "%s: read (%d) and stored value (%d) differ\n",
284 dattr->attr.name, val, *field);
285 *field = val;
286 }
287
288 count = scnprintf(buf, PAGE_SIZE, "%d\n", val);
289out:
290 mutex_unlock(&tsdata->mutex);
291 return error ?: count;
292}
293
294static ssize_t edt_ft5x06_setting_store(struct device *dev,
295 struct device_attribute *dattr,
296 const char *buf, size_t count)
297{
298 struct i2c_client *client = to_i2c_client(dev);
299 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
300 struct edt_ft5x06_attribute *attr =
301 container_of(dattr, struct edt_ft5x06_attribute, dattr);
302 u8 *field = (u8 *)((char *)tsdata + attr->field_offset);
303 unsigned int val;
304 int error;
305
306 mutex_lock(&tsdata->mutex);
307
308 if (tsdata->factory_mode) {
309 error = -EIO;
310 goto out;
311 }
312
313 error = kstrtouint(buf, 0, &val);
314 if (error)
315 goto out;
316
317 if (val < attr->limit_low || val > attr->limit_high) {
318 error = -ERANGE;
319 goto out;
320 }
321
322 error = edt_ft5x06_register_write(tsdata, attr->addr, val);
323 if (error) {
324 dev_err(&tsdata->client->dev,
325 "Failed to update attribute %s, error: %d\n",
326 dattr->attr.name, error);
327 goto out;
328 }
329
330 *field = val;
331
332out:
333 mutex_unlock(&tsdata->mutex);
334 return error ?: count;
335}
336
337static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, 0, 31);
338static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, 0, 31);
339static EDT_ATTR(threshold, S_IWUSR | S_IRUGO,
340 WORK_REGISTER_THRESHOLD, 20, 80);
341static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO,
342 WORK_REGISTER_REPORT_RATE, 3, 14);
343
344static struct attribute *edt_ft5x06_attrs[] = {
345 &edt_ft5x06_attr_gain.dattr.attr,
346 &edt_ft5x06_attr_offset.dattr.attr,
347 &edt_ft5x06_attr_threshold.dattr.attr,
348 &edt_ft5x06_attr_report_rate.dattr.attr,
349 NULL
350};
351
352static const struct attribute_group edt_ft5x06_attr_group = {
353 .attrs = edt_ft5x06_attrs,
354};
355
356#ifdef CONFIG_DEBUG_FS
357static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
358{
359 struct i2c_client *client = tsdata->client;
360 int retries = EDT_SWITCH_MODE_RETRIES;
361 int ret;
362 int error;
363
364 disable_irq(client->irq);
365
366 if (!tsdata->raw_buffer) {
367 tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
368 sizeof(u16);
369 tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
370 if (!tsdata->raw_buffer) {
371 error = -ENOMEM;
372 goto err_out;
373 }
374 }
375
376 /* mode register is 0x3c when in the work mode */
377 error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03);
378 if (error) {
379 dev_err(&client->dev,
380 "failed to switch to factory mode, error %d\n", error);
381 goto err_out;
382 }
383
384 tsdata->factory_mode = true;
385 do {
386 mdelay(EDT_SWITCH_MODE_DELAY);
387 /* mode register is 0x01 when in factory mode */
388 ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
389 if (ret == 0x03)
390 break;
391 } while (--retries > 0);
392
393 if (retries == 0) {
394 dev_err(&client->dev, "not in factory mode after %dms.\n",
395 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
396 error = -EIO;
397 goto err_out;
398 }
399
400 return 0;
401
402err_out:
403 kfree(tsdata->raw_buffer);
404 tsdata->raw_buffer = NULL;
405 tsdata->factory_mode = false;
406 enable_irq(client->irq);
407
408 return error;
409}
410
411static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
412{
413 struct i2c_client *client = tsdata->client;
414 int retries = EDT_SWITCH_MODE_RETRIES;
415 int ret;
416 int error;
417
418 /* mode register is 0x01 when in the factory mode */
419 error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1);
420 if (error) {
421 dev_err(&client->dev,
422 "failed to switch to work mode, error: %d\n", error);
423 return error;
424 }
425
426 tsdata->factory_mode = false;
427
428 do {
429 mdelay(EDT_SWITCH_MODE_DELAY);
430 /* mode register is 0x01 when in factory mode */
431 ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
432 if (ret == 0x01)
433 break;
434 } while (--retries > 0);
435
436 if (retries == 0) {
437 dev_err(&client->dev, "not in work mode after %dms.\n",
438 EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
439 tsdata->factory_mode = true;
440 return -EIO;
441 }
442
443 if (tsdata->raw_buffer)
444 kfree(tsdata->raw_buffer);
445 tsdata->raw_buffer = NULL;
446
447 /* restore parameters */
448 edt_ft5x06_register_write(tsdata, WORK_REGISTER_THRESHOLD,
449 tsdata->threshold);
450 edt_ft5x06_register_write(tsdata, WORK_REGISTER_GAIN,
451 tsdata->gain);
452 edt_ft5x06_register_write(tsdata, WORK_REGISTER_OFFSET,
453 tsdata->offset);
454 edt_ft5x06_register_write(tsdata, WORK_REGISTER_REPORT_RATE,
455 tsdata->report_rate);
456
457 enable_irq(client->irq);
458
459 return 0;
460}
461
462static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
463{
464 struct edt_ft5x06_ts_data *tsdata = data;
465
466 *mode = tsdata->factory_mode;
467
468 return 0;
469};
470
471static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
472{
473 struct edt_ft5x06_ts_data *tsdata = data;
474 int retval = 0;
475
476 if (mode > 1)
477 return -ERANGE;
478
479 mutex_lock(&tsdata->mutex);
480
481 if (mode != tsdata->factory_mode) {
482 retval = mode ? edt_ft5x06_factory_mode(tsdata) :
483 edt_ft5x06_work_mode(tsdata);
484 }
485
486 mutex_unlock(&tsdata->mutex);
487
488 return retval;
489};
490
491DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
492 edt_ft5x06_debugfs_mode_set, "%llu\n");
493
43c4d13e
SB		 494static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
495 char __user *buf, size_t count, loff_t *off)
496{
497 struct edt_ft5x06_ts_data *tsdata = file->private_data;
498 struct i2c_client *client = tsdata->client;
499 int retries = EDT_RAW_DATA_RETRIES;
500 int val, i, error;
501 size_t read = 0;
502 int colbytes;
503 char wrbuf[3];
504 u8 *rdbuf;
505
506 if (*off < 0 || *off >= tsdata->raw_bufsize)
507 return 0;
508
509 mutex_lock(&tsdata->mutex);
510
511 if (!tsdata->factory_mode || !tsdata->raw_buffer) {
512 error = -EIO;
513 goto out;
514 }
515
516 error = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
517 if (error) {
518 dev_dbg(&client->dev,
519 "failed to write 0x08 register, error %d\n", error);
520 goto out;
521 }
522
523 do {
524 msleep(EDT_RAW_DATA_DELAY);
525 val = edt_ft5x06_register_read(tsdata, 0x08);
526 if (val < 1)
527 break;
528 } while (--retries > 0);
529
530 if (val < 0) {
531 error = val;
532 dev_dbg(&client->dev,
533 "failed to read 0x08 register, error %d\n", error);
534 goto out;
535 }
536
537 if (retries == 0) {
538 dev_dbg(&client->dev,
539 "timed out waiting for register to settle\n");
540 error = -ETIMEDOUT;
541 goto out;
542 }
543
544 rdbuf = tsdata->raw_buffer;
545 colbytes = tsdata->num_y * sizeof(u16);
546
547 wrbuf[0] = 0xf5;
548 wrbuf[1] = 0x0e;
549 for (i = 0; i < tsdata->num_x; i++) {
550 wrbuf[2] = i; /* column index */
551 error = edt_ft5x06_ts_readwrite(tsdata->client,
552 sizeof(wrbuf), wrbuf,
553 colbytes, rdbuf);
554 if (error)
555 goto out;
556
557 rdbuf += colbytes;
558 }
559
560 read = min_t(size_t, count, tsdata->raw_bufsize - *off);
35b1da4e
AL		 561 if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
562 error = -EFAULT;
563 goto out;
564 }
565
566 *off += read;
43c4d13e
SB		 567out:
568 mutex_unlock(&tsdata->mutex);
569 return error ?: read;
570};
571
572
573static const struct file_operations debugfs_raw_data_fops = {
f6c0df6a 574 .open = simple_open,
43c4d13e
SB		 575 .read = edt_ft5x06_debugfs_raw_data_read,
576};
577
5298cc4c 578static void
43c4d13e
SB		 579edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
580 const char *debugfs_name)
581{
582 tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
583 if (!tsdata->debug_dir)
584 return;
585
586 debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
587 debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
588
589 debugfs_create_file("mode", S_IRUSR | S_IWUSR,
590 tsdata->debug_dir, tsdata, &debugfs_mode_fops);
591 debugfs_create_file("raw_data", S_IRUSR,
592 tsdata->debug_dir, tsdata, &debugfs_raw_data_fops);
593}
594
e2619cf7 595static void
43c4d13e
SB		 596edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
597{
598 if (tsdata->debug_dir)
599 debugfs_remove_recursive(tsdata->debug_dir);
a1d0fa77 600 kfree(tsdata->raw_buffer);
43c4d13e
SB		 601}
602
603#else
604
605static inline void
606edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
607 const char *debugfs_name)
608{
609}
610
611static inline void
612edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
613{
614}
615
616#endif /* CONFIG_DEBUGFS */
617
618
619
5298cc4c 620static int edt_ft5x06_ts_reset(struct i2c_client *client,
43c4d13e
SB		 621 int reset_pin)
622{
623 int error;
624
625 if (gpio_is_valid(reset_pin)) {
626 /* this pulls reset down, enabling the low active reset */
627 error = gpio_request_one(reset_pin, GPIOF_OUT_INIT_LOW,
628 "edt-ft5x06 reset");
629 if (error) {
630 dev_err(&client->dev,
631 "Failed to request GPIO %d as reset pin, error %d\n",
632 reset_pin, error);
633 return error;
634 }
635
636 mdelay(50);
637 gpio_set_value(reset_pin, 1);
638 mdelay(100);
639 }
640
641 return 0;
642}
643
5298cc4c 644static int edt_ft5x06_ts_identify(struct i2c_client *client,
43c4d13e
SB		 645 char *model_name,
646 char *fw_version)
647{
648 u8 rdbuf[EDT_NAME_LEN];
649 char *p;
650 int error;
651
652 error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
653 EDT_NAME_LEN - 1, rdbuf);
654 if (error)
655 return error;
656
657 /* remove last '$' end marker */
658 rdbuf[EDT_NAME_LEN - 1] = '\0';
659 if (rdbuf[EDT_NAME_LEN - 2] == '$')
660 rdbuf[EDT_NAME_LEN - 2] = '\0';
661
662 /* look for Model/Version separator */
663 p = strchr(rdbuf, '*');
664 if (p)
665 *p++ = '\0';
666
667 strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
668 strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);
669
670 return 0;
671}
672
673#define EDT_ATTR_CHECKSET(name, reg) \
674 if (pdata->name >= edt_ft5x06_attr_##name.limit_low && \
675 pdata->name <= edt_ft5x06_attr_##name.limit_high) \
676 edt_ft5x06_register_write(tsdata, reg, pdata->name)
677
5298cc4c 678static void
43c4d13e
SB		 679edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
680 const struct edt_ft5x06_platform_data *pdata)
681{
682 if (!pdata->use_parameters)
683 return;
684
685 /* pick up defaults from the platform data */
686 EDT_ATTR_CHECKSET(threshold, WORK_REGISTER_THRESHOLD);
687 EDT_ATTR_CHECKSET(gain, WORK_REGISTER_GAIN);
688 EDT_ATTR_CHECKSET(offset, WORK_REGISTER_OFFSET);
689 EDT_ATTR_CHECKSET(report_rate, WORK_REGISTER_REPORT_RATE);
690}
691
5298cc4c 692static void
43c4d13e
SB		 693edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
694{
695 tsdata->threshold = edt_ft5x06_register_read(tsdata,
696 WORK_REGISTER_THRESHOLD);
697 tsdata->gain = edt_ft5x06_register_read(tsdata, WORK_REGISTER_GAIN);
698 tsdata->offset = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OFFSET);
699 tsdata->report_rate = edt_ft5x06_register_read(tsdata,
700 WORK_REGISTER_REPORT_RATE);
701 tsdata->num_x = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_X);
702 tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
703}
704
5298cc4c 705static int edt_ft5x06_ts_probe(struct i2c_client *client,
43c4d13e
SB		 706 const struct i2c_device_id *id)
707{
708 const struct edt_ft5x06_platform_data *pdata =
709 client->dev.platform_data;
710 struct edt_ft5x06_ts_data *tsdata;
711 struct input_dev *input;
712 int error;
713 char fw_version[EDT_NAME_LEN];
714
715 dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");
716
717 if (!pdata) {
718 dev_err(&client->dev, "no platform data?\n");
719 return -EINVAL;
720 }
721
722 error = edt_ft5x06_ts_reset(client, pdata->reset_pin);
723 if (error)
724 return error;
725
726 if (gpio_is_valid(pdata->irq_pin)) {
727 error = gpio_request_one(pdata->irq_pin,
728 GPIOF_IN, "edt-ft5x06 irq");
729 if (error) {
730 dev_err(&client->dev,
731 "Failed to request GPIO %d, error %d\n",
732 pdata->irq_pin, error);
733 return error;
734 }
735 }
736
737 tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
738 input = input_allocate_device();
739 if (!tsdata || !input) {
740 dev_err(&client->dev, "failed to allocate driver data.\n");
741 error = -ENOMEM;
742 goto err_free_mem;
743 }
744
745 mutex_init(&tsdata->mutex);
746 tsdata->client = client;
747 tsdata->input = input;
748 tsdata->factory_mode = false;
749
750 error = edt_ft5x06_ts_identify(client, tsdata->name, fw_version);
751 if (error) {
752 dev_err(&client->dev, "touchscreen probe failed\n");
753 goto err_free_mem;
754 }
755
756 edt_ft5x06_ts_get_defaults(tsdata, pdata);
757 edt_ft5x06_ts_get_parameters(tsdata);
758
759 dev_dbg(&client->dev,
760 "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
761 tsdata->name, fw_version, tsdata->num_x, tsdata->num_y);
762
763 input->name = tsdata->name;
764 input->id.bustype = BUS_I2C;
765 input->dev.parent = &client->dev;
766
767 __set_bit(EV_SYN, input->evbit);
768 __set_bit(EV_KEY, input->evbit);
769 __set_bit(EV_ABS, input->evbit);
770 __set_bit(BTN_TOUCH, input->keybit);
771 input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
772 input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
773 input_set_abs_params(input, ABS_MT_POSITION_X,
774 0, tsdata->num_x * 64 - 1, 0, 0);
775 input_set_abs_params(input, ABS_MT_POSITION_Y,
776 0, tsdata->num_y * 64 - 1, 0, 0);
b4adbbef 777 error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
43c4d13e
SB		 778 if (error) {
779 dev_err(&client->dev, "Unable to init MT slots.\n");
780 goto err_free_mem;
781 }
782
783 input_set_drvdata(input, tsdata);
784 i2c_set_clientdata(client, tsdata);
785
786 error = request_threaded_irq(client->irq, NULL, edt_ft5x06_ts_isr,
787 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
788 client->name, tsdata);
789 if (error) {
790 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
791 goto err_free_mem;
792 }
793
794 error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
795 if (error)
796 goto err_free_irq;
797
798 error = input_register_device(input);
799 if (error)
800 goto err_remove_attrs;
801
802 edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
803 device_init_wakeup(&client->dev, 1);
804
805 dev_dbg(&client->dev,
806 "EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
807 pdata->irq_pin, pdata->reset_pin);
808
809 return 0;
810
811err_remove_attrs:
812 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
813err_free_irq:
814 free_irq(client->irq, tsdata);
815err_free_mem:
816 input_free_device(input);
817 kfree(tsdata);
818
819 if (gpio_is_valid(pdata->irq_pin))
820 gpio_free(pdata->irq_pin);
821
822 return error;
823}
824
e2619cf7 825static int edt_ft5x06_ts_remove(struct i2c_client *client)
43c4d13e
SB		 826{
827 const struct edt_ft5x06_platform_data *pdata =
828 dev_get_platdata(&client->dev);
829 struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
830
831 edt_ft5x06_ts_teardown_debugfs(tsdata);
832 sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
833
834 free_irq(client->irq, tsdata);
835 input_unregister_device(tsdata->input);
836
837 if (gpio_is_valid(pdata->irq_pin))
838 gpio_free(pdata->irq_pin);
839 if (gpio_is_valid(pdata->reset_pin))
840 gpio_free(pdata->reset_pin);
841
43c4d13e
SB		 842 kfree(tsdata);
843
844 return 0;
845}
846
847#ifdef CONFIG_PM_SLEEP
848static int edt_ft5x06_ts_suspend(struct device *dev)
849{
850 struct i2c_client *client = to_i2c_client(dev);
851
852 if (device_may_wakeup(dev))
853 enable_irq_wake(client->irq);
854
855 return 0;
856}
857
858static int edt_ft5x06_ts_resume(struct device *dev)
859{
860 struct i2c_client *client = to_i2c_client(dev);
861
862 if (device_may_wakeup(dev))
863 disable_irq_wake(client->irq);
864
865 return 0;
866}
867#endif
868
869static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
870 edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);
871
872static const struct i2c_device_id edt_ft5x06_ts_id[] = {
873 { "edt-ft5x06", 0 },
874 { }
875};
876MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);
877
878static struct i2c_driver edt_ft5x06_ts_driver = {
879 .driver = {
880 .owner = THIS_MODULE,
881 .name = "edt_ft5x06",
882 .pm = &edt_ft5x06_ts_pm_ops,
883 },
884 .id_table = edt_ft5x06_ts_id,
885 .probe = edt_ft5x06_ts_probe,
1cb0aa88 886 .remove = edt_ft5x06_ts_remove,
43c4d13e
SB		 887};
888
889module_i2c_driver(edt_ft5x06_ts_driver);
890
891MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
892MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
893MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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