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