projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Input: cyapa - do not try to enable proximity reporting on older devices
[deliverable/linux.git] / drivers / input / touchscreen / zforce_ts.c
CommitLineData
c6d81bd7
HS		 1/*
2 * Copyright (C) 2012-2013 MundoReader S.L.
3 * Author: Heiko Stuebner <heiko@sntech.de>
4 *
5 * based in parts on Nook zforce driver
6 *
7 * Copyright (C) 2010 Barnes & Noble, Inc.
8 * Author: Pieter Truter<ptruter@intrinsyc.com>
9 *
10 * This software is licensed under the terms of the GNU General Public
11 * License version 2, as published by the Free Software Foundation, and
12 * may be copied, distributed, and modified under those terms.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <linux/module.h>
21#include <linux/hrtimer.h>
22#include <linux/slab.h>
23#include <linux/input.h>
24#include <linux/interrupt.h>
25#include <linux/i2c.h>
26#include <linux/delay.h>
2d538095 27#include <linux/gpio/consumer.h>
c6d81bd7
HS		 28#include <linux/device.h>
29#include <linux/sysfs.h>
30#include <linux/input/mt.h>
31#include <linux/platform_data/zforce_ts.h>
39740370 32#include <linux/regulator/consumer.h>
6f2e6c9b 33#include <linux/of.h>
c6d81bd7
HS		 34
35#define WAIT_TIMEOUT msecs_to_jiffies(1000)
36
37#define FRAME_START 0xee
d333b606 38#define FRAME_MAXSIZE 257
c6d81bd7
HS		 39
40/* Offsets of the different parts of the payload the controller sends */
41#define PAYLOAD_HEADER 0
42#define PAYLOAD_LENGTH 1
43#define PAYLOAD_BODY 2
44
45/* Response offsets */
46#define RESPONSE_ID 0
47#define RESPONSE_DATA 1
48
49/* Commands */
50#define COMMAND_DEACTIVATE 0x00
51#define COMMAND_INITIALIZE 0x01
52#define COMMAND_RESOLUTION 0x02
53#define COMMAND_SETCONFIG 0x03
54#define COMMAND_DATAREQUEST 0x04
55#define COMMAND_SCANFREQ 0x08
56#define COMMAND_STATUS 0X1e
57
58/*
59 * Responses the controller sends as a result of
60 * command requests
61 */
62#define RESPONSE_DEACTIVATE 0x00
63#define RESPONSE_INITIALIZE 0x01
64#define RESPONSE_RESOLUTION 0x02
65#define RESPONSE_SETCONFIG 0x03
66#define RESPONSE_SCANFREQ 0x08
67#define RESPONSE_STATUS 0X1e
68
69/*
deb49819 70 * Notifications are sent by the touch controller without
c6d81bd7
HS		 71 * being requested by the driver and include for example
72 * touch indications
73 */
74#define NOTIFICATION_TOUCH 0x04
75#define NOTIFICATION_BOOTCOMPLETE 0x07
76#define NOTIFICATION_OVERRUN 0x25
77#define NOTIFICATION_PROXIMITY 0x26
78#define NOTIFICATION_INVALID_COMMAND 0xfe
79
80#define ZFORCE_REPORT_POINTS 2
81#define ZFORCE_MAX_AREA 0xff
82
83#define STATE_DOWN 0
84#define STATE_MOVE 1
85#define STATE_UP 2
86
87#define SETCONFIG_DUALTOUCH (1 << 0)
88
89struct zforce_point {
90 int coord_x;
91 int coord_y;
92 int state;
93 int id;
94 int area_major;
95 int area_minor;
96 int orientation;
97 int pressure;
98 int prblty;
99};
100
101/*
102 * @client the i2c_client
103 * @input the input device
104 * @suspending in the process of going to suspend (don't emit wakeup
105 * events for commands executed to suspend the device)
106 * @suspended device suspended
107 * @access_mutex serialize i2c-access, to keep multipart reads together
108 * @command_done completion to wait for the command result
deb49819
LO		 109 * @command_mutex serialize commands sent to the ic
110 * @command_waiting the id of the command that is currently waiting
c6d81bd7
HS		 111 * for a result
112 * @command_result returned result of the command
113 */
114struct zforce_ts {
115 struct i2c_client *client;
116 struct input_dev *input;
117 const struct zforce_ts_platdata *pdata;
118 char phys[32];
119
39740370
HS		 120 struct regulator *reg_vdd;
121
2d538095
DB		 122 struct gpio_desc *gpio_int;
123 struct gpio_desc *gpio_rst;
124
c6d81bd7
HS		 125 bool suspending;
126 bool suspended;
127 bool boot_complete;
128
129 /* Firmware version information */
130 u16 version_major;
131 u16 version_minor;
132 u16 version_build;
133 u16 version_rev;
134
135 struct mutex access_mutex;
136
137 struct completion command_done;
138 struct mutex command_mutex;
139 int command_waiting;
140 int command_result;
141};
142
143static int zforce_command(struct zforce_ts *ts, u8 cmd)
144{
145 struct i2c_client *client = ts->client;
146 char buf[3];
147 int ret;
148
149 dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd);
150
151 buf[0] = FRAME_START;
152 buf[1] = 1; /* data size, command only */
153 buf[2] = cmd;
154
155 mutex_lock(&ts->access_mutex);
156 ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf));
157 mutex_unlock(&ts->access_mutex);
158 if (ret < 0) {
159 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
160 return ret;
161 }
162
163 return 0;
164}
165
2d538095
DB		 166static void zforce_reset_assert(struct zforce_ts *ts)
167{
168 gpiod_set_value_cansleep(ts->gpio_rst, 1);
169}
170
171static void zforce_reset_deassert(struct zforce_ts *ts)
172{
173 gpiod_set_value_cansleep(ts->gpio_rst, 0);
174}
175
c6d81bd7
HS		 176static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len)
177{
178 struct i2c_client *client = ts->client;
179 int ret;
180
181 ret = mutex_trylock(&ts->command_mutex);
182 if (!ret) {
183 dev_err(&client->dev, "already waiting for a command\n");
184 return -EBUSY;
185 }
186
187 dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n",
188 buf[1], buf[2]);
189
190 ts->command_waiting = buf[2];
191
192 mutex_lock(&ts->access_mutex);
193 ret = i2c_master_send(client, buf, len);
194 mutex_unlock(&ts->access_mutex);
195 if (ret < 0) {
196 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
197 goto unlock;
198 }
199
200 dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]);
201
202 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) {
203 ret = -ETIME;
204 goto unlock;
205 }
206
207 ret = ts->command_result;
208
209unlock:
210 mutex_unlock(&ts->command_mutex);
211 return ret;
212}
213
214static int zforce_command_wait(struct zforce_ts *ts, u8 cmd)
215{
216 struct i2c_client *client = ts->client;
217 char buf[3];
218 int ret;
219
220 dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd);
221
222 buf[0] = FRAME_START;
223 buf[1] = 1; /* data size, command only */
224 buf[2] = cmd;
225
226 ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
227 if (ret < 0) {
228 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
229 return ret;
230 }
231
232 return 0;
233}
234
235static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y)
236{
237 struct i2c_client *client = ts->client;
238 char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION,
239 (x & 0xff), ((x >> 8) & 0xff),
240 (y & 0xff), ((y >> 8) & 0xff) };
241
242 dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y);
243
244 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
245}
246
247static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger,
248 u16 stylus)
249{
250 struct i2c_client *client = ts->client;
251 char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ,
252 (idle & 0xff), ((idle >> 8) & 0xff),
253 (finger & 0xff), ((finger >> 8) & 0xff),
254 (stylus & 0xff), ((stylus >> 8) & 0xff) };
255
ad697b96
LO		 256 dev_dbg(&client->dev,
257 "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n",
c6d81bd7
HS		 258 idle, finger, stylus);
259
260 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
261}
262
263static int zforce_setconfig(struct zforce_ts *ts, char b1)
264{
265 struct i2c_client *client = ts->client;
266 char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG,
267 b1, 0, 0, 0 };
268
269 dev_dbg(&client->dev, "set config to (%d)\n", b1);
270
271 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
272}
273
274static int zforce_start(struct zforce_ts *ts)
275{
276 struct i2c_client *client = ts->client;
87273364 277 const struct zforce_ts_platdata *pdata = ts->pdata;
c6d81bd7
HS		 278 int ret;
279
280 dev_dbg(&client->dev, "starting device\n");
281
282 ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
283 if (ret) {
284 dev_err(&client->dev, "Unable to initialize, %d\n", ret);
285 return ret;
286 }
287
288 ret = zforce_resolution(ts, pdata->x_max, pdata->y_max);
289 if (ret) {
290 dev_err(&client->dev, "Unable to set resolution, %d\n", ret);
291 goto error;
292 }
293
294 ret = zforce_scan_frequency(ts, 10, 50, 50);
295 if (ret) {
296 dev_err(&client->dev, "Unable to set scan frequency, %d\n",
297 ret);
298 goto error;
299 }
300
3c4396b4
WY		 301 ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH);
302 if (ret) {
c6d81bd7
HS		 303 dev_err(&client->dev, "Unable to set config\n");
304 goto error;
305 }
306
307 /* start sending touch events */
308 ret = zforce_command(ts, COMMAND_DATAREQUEST);
309 if (ret) {
310 dev_err(&client->dev, "Unable to request data\n");
311 goto error;
312 }
313
314 /*
315 * Per NN, initial cal. take max. of 200msec.
316 * Allow time to complete this calibration
317 */
318 msleep(200);
319
320 return 0;
321
322error:
323 zforce_command_wait(ts, COMMAND_DEACTIVATE);
324 return ret;
325}
326
327static int zforce_stop(struct zforce_ts *ts)
328{
329 struct i2c_client *client = ts->client;
330 int ret;
331
332 dev_dbg(&client->dev, "stopping device\n");
333
334 /* Deactivates touch sensing and puts the device into sleep. */
335 ret = zforce_command_wait(ts, COMMAND_DEACTIVATE);
336 if (ret != 0) {
337 dev_err(&client->dev, "could not deactivate device, %d\n",
338 ret);
339 return ret;
340 }
341
342 return 0;
343}
344
345static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
346{
347 struct i2c_client *client = ts->client;
87273364 348 const struct zforce_ts_platdata *pdata = ts->pdata;
c6d81bd7
HS		 349 struct zforce_point point;
350 int count, i, num = 0;
351
352 count = payload[0];
353 if (count > ZFORCE_REPORT_POINTS) {
ad697b96
LO		 354 dev_warn(&client->dev,
355 "too many coordinates %d, expected max %d\n",
c6d81bd7
HS		 356 count, ZFORCE_REPORT_POINTS);
357 count = ZFORCE_REPORT_POINTS;
358 }
359
360 for (i = 0; i < count; i++) {
361 point.coord_x =
362 payload[9 * i + 2] << 8 | payload[9 * i + 1];
363 point.coord_y =
364 payload[9 * i + 4] << 8 | payload[9 * i + 3];
365
366 if (point.coord_x > pdata->x_max ||
367 point.coord_y > pdata->y_max) {
368 dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
369 point.coord_x, point.coord_y);
370 point.coord_x = point.coord_y = 0;
371 }
372
373 point.state = payload[9 * i + 5] & 0x03;
374 point.id = (payload[9 * i + 5] & 0xfc) >> 2;
375
376 /* determine touch major, minor and orientation */
377 point.area_major = max(payload[9 * i + 6],
378 payload[9 * i + 7]);
379 point.area_minor = min(payload[9 * i + 6],
380 payload[9 * i + 7]);
381 point.orientation = payload[9 * i + 6] > payload[9 * i + 7];
382
383 point.pressure = payload[9 * i + 8];
384 point.prblty = payload[9 * i + 9];
385
386 dev_dbg(&client->dev,
387 "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n",
388 i, count, point.state, point.id,
389 point.pressure, point.prblty,
390 point.coord_x, point.coord_y,
391 point.area_major, point.area_minor,
392 point.orientation);
393
394 /* the zforce id starts with "1", so needs to be decreased */
395 input_mt_slot(ts->input, point.id - 1);
396
397 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER,
398 point.state != STATE_UP);
399
400 if (point.state != STATE_UP) {
401 input_report_abs(ts->input, ABS_MT_POSITION_X,
402 point.coord_x);
403 input_report_abs(ts->input, ABS_MT_POSITION_Y,
404 point.coord_y);
405 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
406 point.area_major);
407 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
408 point.area_minor);
409 input_report_abs(ts->input, ABS_MT_ORIENTATION,
410 point.orientation);
411 num++;
412 }
413 }
414
415 input_mt_sync_frame(ts->input);
416
417 input_mt_report_finger_count(ts->input, num);
418
419 input_sync(ts->input);
420
421 return 0;
422}
423
424static int zforce_read_packet(struct zforce_ts *ts, u8 *buf)
425{
426 struct i2c_client *client = ts->client;
427 int ret;
428
429 mutex_lock(&ts->access_mutex);
430
431 /* read 2 byte message header */
432 ret = i2c_master_recv(client, buf, 2);
433 if (ret < 0) {
434 dev_err(&client->dev, "error reading header: %d\n", ret);
435 goto unlock;
436 }
437
438 if (buf[PAYLOAD_HEADER] != FRAME_START) {
439 dev_err(&client->dev, "invalid frame start: %d\n", buf[0]);
440 ret = -EIO;
441 goto unlock;
442 }
443
5aee41a6 444 if (buf[PAYLOAD_LENGTH] == 0) {
c6d81bd7
HS		 445 dev_err(&client->dev, "invalid payload length: %d\n",
446 buf[PAYLOAD_LENGTH]);
447 ret = -EIO;
448 goto unlock;
449 }
450
451 /* read the message */
452 ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]);
453 if (ret < 0) {
454 dev_err(&client->dev, "error reading payload: %d\n", ret);
455 goto unlock;
456 }
457
458 dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n",
459 buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]);
460
461unlock:
462 mutex_unlock(&ts->access_mutex);
463 return ret;
464}
465
466static void zforce_complete(struct zforce_ts *ts, int cmd, int result)
467{
468 struct i2c_client *client = ts->client;
469
470 if (ts->command_waiting == cmd) {
471 dev_dbg(&client->dev, "completing command 0x%x\n", cmd);
472 ts->command_result = result;
473 complete(&ts->command_done);
474 } else {
475 dev_dbg(&client->dev, "command %d not for us\n", cmd);
476 }
477}
478
499e6127
HS		 479static irqreturn_t zforce_irq(int irq, void *dev_id)
480{
481 struct zforce_ts *ts = dev_id;
482 struct i2c_client *client = ts->client;
483
484 if (ts->suspended && device_may_wakeup(&client->dev))
485 pm_wakeup_event(&client->dev, 500);
486
487 return IRQ_WAKE_THREAD;
488}
489
490static irqreturn_t zforce_irq_thread(int irq, void *dev_id)
c6d81bd7
HS		 491{
492 struct zforce_ts *ts = dev_id;
493 struct i2c_client *client = ts->client;
c6d81bd7 494 int ret;
d333b606 495 u8 payload_buffer[FRAME_MAXSIZE];
c6d81bd7
HS		 496 u8 *payload;
497
498 /*
499e6127 499 * When still suspended, return.
c6d81bd7
HS		 500 * Due to the level-interrupt we will get re-triggered later.
501 */
502 if (ts->suspended) {
c6d81bd7
HS		 503 msleep(20);
504 return IRQ_HANDLED;
505 }
506
507 dev_dbg(&client->dev, "handling interrupt\n");
508
509 /* Don't emit wakeup events from commands run by zforce_suspend */
510 if (!ts->suspending && device_may_wakeup(&client->dev))
511 pm_stay_awake(&client->dev);
512
dd1b85dc 513 while (gpiod_get_value_cansleep(ts->gpio_int)) {
c6d81bd7
HS		 514 ret = zforce_read_packet(ts, payload_buffer);
515 if (ret < 0) {
ad697b96
LO		 516 dev_err(&client->dev,
517 "could not read packet, ret: %d\n", ret);
c6d81bd7
HS		 518 break;
519 }
520
521 payload = &payload_buffer[PAYLOAD_BODY];
522
523 switch (payload[RESPONSE_ID]) {
524 case NOTIFICATION_TOUCH:
525 /*
526 * Always report touch-events received while
527 * suspending, when being a wakeup source
528 */
529 if (ts->suspending && device_may_wakeup(&client->dev))
530 pm_wakeup_event(&client->dev, 500);
531 zforce_touch_event(ts, &payload[RESPONSE_DATA]);
532 break;
533
534 case NOTIFICATION_BOOTCOMPLETE:
535 ts->boot_complete = payload[RESPONSE_DATA];
536 zforce_complete(ts, payload[RESPONSE_ID], 0);
537 break;
538
539 case RESPONSE_INITIALIZE:
540 case RESPONSE_DEACTIVATE:
541 case RESPONSE_SETCONFIG:
542 case RESPONSE_RESOLUTION:
543 case RESPONSE_SCANFREQ:
544 zforce_complete(ts, payload[RESPONSE_ID],
545 payload[RESPONSE_DATA]);
546 break;
547
548 case RESPONSE_STATUS:
549 /*
550 * Version Payload Results
551 * [2:major] [2:minor] [2:build] [2:rev]
552 */
553 ts->version_major = (payload[RESPONSE_DATA + 1] << 8) |
554 payload[RESPONSE_DATA];
555 ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) |
556 payload[RESPONSE_DATA + 2];
557 ts->version_build = (payload[RESPONSE_DATA + 5] << 8) |
558 payload[RESPONSE_DATA + 4];
559 ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) |
560 payload[RESPONSE_DATA + 6];
ad697b96
LO		 561 dev_dbg(&ts->client->dev,
562 "Firmware Version %04x:%04x %04x:%04x\n",
c6d81bd7
HS		 563 ts->version_major, ts->version_minor,
564 ts->version_build, ts->version_rev);
565
566 zforce_complete(ts, payload[RESPONSE_ID], 0);
567 break;
568
569 case NOTIFICATION_INVALID_COMMAND:
570 dev_err(&ts->client->dev, "invalid command: 0x%x\n",
571 payload[RESPONSE_DATA]);
572 break;
573
574 default:
ad697b96
LO		 575 dev_err(&ts->client->dev,
576 "unrecognized response id: 0x%x\n",
c6d81bd7
HS		 577 payload[RESPONSE_ID]);
578 break;
579 }
580 }
581
582 if (!ts->suspending && device_may_wakeup(&client->dev))
583 pm_relax(&client->dev);
584
585 dev_dbg(&client->dev, "finished interrupt\n");
586
587 return IRQ_HANDLED;
588}
589
590static int zforce_input_open(struct input_dev *dev)
591{
592 struct zforce_ts *ts = input_get_drvdata(dev);
593 int ret;
594
595 ret = zforce_start(ts);
596 if (ret)
597 return ret;
598
599 return 0;
600}
601
602static void zforce_input_close(struct input_dev *dev)
603{
604 struct zforce_ts *ts = input_get_drvdata(dev);
605 struct i2c_client *client = ts->client;
606 int ret;
607
608 ret = zforce_stop(ts);
609 if (ret)
610 dev_warn(&client->dev, "stopping zforce failed\n");
611
612 return;
613}
614
02b6a58b 615static int __maybe_unused zforce_suspend(struct device *dev)
c6d81bd7
HS		 616{
617 struct i2c_client *client = to_i2c_client(dev);
618 struct zforce_ts *ts = i2c_get_clientdata(client);
619 struct input_dev *input = ts->input;
620 int ret = 0;
621
622 mutex_lock(&input->mutex);
623 ts->suspending = true;
624
625 /*
626 * When configured as a wakeup source device should always wake
627 * the system, therefore start device if necessary.
628 */
629 if (device_may_wakeup(&client->dev)) {
630 dev_dbg(&client->dev, "suspend while being a wakeup source\n");
631
632 /* Need to start device, if not open, to be a wakeup source. */
633 if (!input->users) {
634 ret = zforce_start(ts);
635 if (ret)
636 goto unlock;
637 }
638
639 enable_irq_wake(client->irq);
640 } else if (input->users) {
ad697b96
LO		 641 dev_dbg(&client->dev,
642 "suspend without being a wakeup source\n");
c6d81bd7
HS		 643
644 ret = zforce_stop(ts);
645 if (ret)
646 goto unlock;
647
648 disable_irq(client->irq);
649 }
650
651 ts->suspended = true;
652
653unlock:
654 ts->suspending = false;
655 mutex_unlock(&input->mutex);
656
657 return ret;
658}
659
02b6a58b 660static int __maybe_unused zforce_resume(struct device *dev)
c6d81bd7
HS		 661{
662 struct i2c_client *client = to_i2c_client(dev);
663 struct zforce_ts *ts = i2c_get_clientdata(client);
664 struct input_dev *input = ts->input;
665 int ret = 0;
666
667 mutex_lock(&input->mutex);
668
669 ts->suspended = false;
670
671 if (device_may_wakeup(&client->dev)) {
672 dev_dbg(&client->dev, "resume from being a wakeup source\n");
673
674 disable_irq_wake(client->irq);
675
676 /* need to stop device if it was not open on suspend */
677 if (!input->users) {
678 ret = zforce_stop(ts);
679 if (ret)
680 goto unlock;
681 }
682 } else if (input->users) {
683 dev_dbg(&client->dev, "resume without being a wakeup source\n");
684
685 enable_irq(client->irq);
686
687 ret = zforce_start(ts);
688 if (ret < 0)
689 goto unlock;
690 }
691
692unlock:
693 mutex_unlock(&input->mutex);
694
695 return ret;
696}
c6d81bd7
HS		 697
698static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume);
699
700static void zforce_reset(void *data)
701{
702 struct zforce_ts *ts = data;
703
2d538095 704 zforce_reset_assert(ts);
39740370
HS		 705
706 udelay(10);
707
708 if (!IS_ERR(ts->reg_vdd))
709 regulator_disable(ts->reg_vdd);
c6d81bd7
HS		 710}
711
6f2e6c9b
HS		 712static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev)
713{
714 struct zforce_ts_platdata *pdata;
715 struct device_node *np = dev->of_node;
716
717 if (!np)
718 return ERR_PTR(-ENOENT);
719
720 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
721 if (!pdata) {
722 dev_err(dev, "failed to allocate platform data\n");
723 return ERR_PTR(-ENOMEM);
724 }
725
6f2e6c9b
HS		 726 if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
727 dev_err(dev, "failed to get x-size property\n");
728 return ERR_PTR(-EINVAL);
729 }
730
731 if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
732 dev_err(dev, "failed to get y-size property\n");
733 return ERR_PTR(-EINVAL);
734 }
735
736 return pdata;
737}
738
c6d81bd7
HS		 739static int zforce_probe(struct i2c_client *client,
740 const struct i2c_device_id *id)
741{
742 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
743 struct zforce_ts *ts;
744 struct input_dev *input_dev;
745 int ret;
746
6f2e6c9b
HS		 747 if (!pdata) {
748 pdata = zforce_parse_dt(&client->dev);
749 if (IS_ERR(pdata))
750 return PTR_ERR(pdata);
751 }
c6d81bd7
HS		 752
753 ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL);
754 if (!ts)
755 return -ENOMEM;
756
2d538095
DB		 757 /* INT GPIO */
758 ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, GPIOD_IN);
759 if (IS_ERR(ts->gpio_int)) {
760 ret = PTR_ERR(ts->gpio_int);
761 dev_err(&client->dev,
762 "failed to request interrupt GPIO: %d\n", ret);
c6d81bd7
HS		 763 return ret;
764 }
765
2d538095
DB		 766 /* RST GPIO */
767 ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1,
768 GPIOD_OUT_HIGH);
769 if (IS_ERR(ts->gpio_rst)) {
770 ret = PTR_ERR(ts->gpio_rst);
771 dev_err(&client->dev,
772 "failed to request reset GPIO: %d\n", ret);
c6d81bd7
HS		 773 return ret;
774 }
775
39740370
HS		 776 ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd");
777 if (IS_ERR(ts->reg_vdd)) {
778 ret = PTR_ERR(ts->reg_vdd);
779 if (ret == -EPROBE_DEFER)
780 return ret;
781 } else {
782 ret = regulator_enable(ts->reg_vdd);
783 if (ret)
784 return ret;
785
786 /*
787 * according to datasheet add 100us grace time after regular
788 * regulator enable delay.
789 */
790 udelay(100);
791 }
792
c6d81bd7
HS		 793 ret = devm_add_action(&client->dev, zforce_reset, ts);
794 if (ret) {
795 dev_err(&client->dev, "failed to register reset action, %d\n",
796 ret);
39740370
HS		 797
798 /* hereafter the regulator will be disabled by the action */
799 if (!IS_ERR(ts->reg_vdd))
800 regulator_disable(ts->reg_vdd);
801
c6d81bd7
HS		 802 return ret;
803 }
804
805 snprintf(ts->phys, sizeof(ts->phys),
806 "%s/input0", dev_name(&client->dev));
807
808 input_dev = devm_input_allocate_device(&client->dev);
809 if (!input_dev) {
810 dev_err(&client->dev, "could not allocate input device\n");
811 return -ENOMEM;
812 }
813
814 mutex_init(&ts->access_mutex);
815 mutex_init(&ts->command_mutex);
816
817 ts->pdata = pdata;
818 ts->client = client;
819 ts->input = input_dev;
820
821 input_dev->name = "Neonode zForce touchscreen";
822 input_dev->phys = ts->phys;
823 input_dev->id.bustype = BUS_I2C;
824
825 input_dev->open = zforce_input_open;
826 input_dev->close = zforce_input_close;
827
828 __set_bit(EV_KEY, input_dev->evbit);
829 __set_bit(EV_SYN, input_dev->evbit);
830 __set_bit(EV_ABS, input_dev->evbit);
831
832 /* For multi touch */
833 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
834 pdata->x_max, 0, 0);
835 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
836 pdata->y_max, 0, 0);
837
838 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
839 ZFORCE_MAX_AREA, 0, 0);
840 input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
841 ZFORCE_MAX_AREA, 0, 0);
842 input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
843 input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT);
844
845 input_set_drvdata(ts->input, ts);
846
847 init_completion(&ts->command_done);
848
849 /*
850 * The zforce pulls the interrupt low when it has data ready.
851 * After it is triggered the isr thread runs until all the available
852 * packets have been read and the interrupt is high again.
853 * Therefore we can trigger the interrupt anytime it is low and do
854 * not need to limit it to the interrupt edge.
855 */
499e6127
HS		 856 ret = devm_request_threaded_irq(&client->dev, client->irq,
857 zforce_irq, zforce_irq_thread,
c6d81bd7
HS		 858 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
859 input_dev->name, ts);
860 if (ret) {
861 dev_err(&client->dev, "irq %d request failed\n", client->irq);
862 return ret;
863 }
864
865 i2c_set_clientdata(client, ts);
866
867 /* let the controller boot */
2d538095 868 zforce_reset_deassert(ts);
c6d81bd7
HS		 869
870 ts->command_waiting = NOTIFICATION_BOOTCOMPLETE;
871 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0)
872 dev_warn(&client->dev, "bootcomplete timed out\n");
873
874 /* need to start device to get version information */
875 ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
876 if (ret) {
877 dev_err(&client->dev, "unable to initialize, %d\n", ret);
878 return ret;
879 }
880
deb49819 881 /* this gets the firmware version among other information */
c6d81bd7
HS		 882 ret = zforce_command_wait(ts, COMMAND_STATUS);
883 if (ret < 0) {
884 dev_err(&client->dev, "couldn't get status, %d\n", ret);
885 zforce_stop(ts);
886 return ret;
887 }
888
889 /* stop device and put it into sleep until it is opened */
890 ret = zforce_stop(ts);
891 if (ret < 0)
892 return ret;
893
894 device_set_wakeup_capable(&client->dev, true);
895
896 ret = input_register_device(input_dev);
897 if (ret) {
898 dev_err(&client->dev, "could not register input device, %d\n",
899 ret);
900 return ret;
901 }
902
903 return 0;
904}
905
906static struct i2c_device_id zforce_idtable[] = {
907 { "zforce-ts", 0 },
908 { }
909};
910MODULE_DEVICE_TABLE(i2c, zforce_idtable);
911
6f2e6c9b 912#ifdef CONFIG_OF
f3f63193 913static const struct of_device_id zforce_dt_idtable[] = {
6f2e6c9b
HS		 914 { .compatible = "neonode,zforce" },
915 {},
916};
917MODULE_DEVICE_TABLE(of, zforce_dt_idtable);
918#endif
919
c6d81bd7
HS		 920static struct i2c_driver zforce_driver = {
921 .driver = {
c6d81bd7
HS		 922 .name = "zforce-ts",
923 .pm = &zforce_pm_ops,
6f2e6c9b 924 .of_match_table = of_match_ptr(zforce_dt_idtable),
c6d81bd7
HS		 925 },
926 .probe = zforce_probe,
927 .id_table = zforce_idtable,
928};
929
930module_i2c_driver(zforce_driver);
931
932MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
933MODULE_DESCRIPTION("zForce TouchScreen Driver");
934MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.13181 seconds and 5 git commands to generate.