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authorHeiko Stübner <heiko@sntech.de>2013-10-31 04:25:32 -0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2013-10-31 11:46:08 -0400
commitc6d81bd7237b5785080087bcf796ce456ef69557 (patch)
tree66ce40f74cedd9b0531b6dfccd8f164226fbdc37
parente4a42f655fdbfadc41f8b2f95dca5e5d395015f5 (diff)
Input: add driver for Neonode zForce based touchscreens
This adds a driver for touchscreens using the zforce infrared technology from Neonode connected via i2c to the host system. It supports multitouch with up to two fingers and tracking of the contacts in hardware. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
-rw-r--r--drivers/input/touchscreen/Kconfig13
-rw-r--r--drivers/input/touchscreen/Makefile1
-rw-r--r--drivers/input/touchscreen/zforce_ts.c836
-rw-r--r--include/linux/platform_data/zforce_ts.h26
4 files changed, 876 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index e09ec67957a3..00d1e547b211 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -919,4 +919,17 @@ config TOUCHSCREEN_TPS6507X
919 To compile this driver as a module, choose M here: the 919 To compile this driver as a module, choose M here: the
920 module will be called tps6507x_ts. 920 module will be called tps6507x_ts.
921 921
922config TOUCHSCREEN_ZFORCE
923 tristate "Neonode zForce infrared touchscreens"
924 depends on I2C
925 depends on GPIOLIB
926 help
927 Say Y here if you have a touchscreen using the zforce
928 infraread technology from Neonode.
929
930 If unsure, say N.
931
932 To compile this driver as a module, choose M here: the
933 module will be called zforce_ts.
934
922endif 935endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index f5216c1bf53e..7587883b8d38 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -75,3 +75,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
75obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o 75obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
76obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o 76obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
77obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o 77obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
78obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c
new file mode 100644
index 000000000000..75762d6ff3ba
--- /dev/null
+++ b/drivers/input/touchscreen/zforce_ts.c
@@ -0,0 +1,836 @@
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/*
67 * Notifications are send by the touch controller without
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
106 * @command_mutex serialize commands send to the ic
107 * @command_waiting the id of the command that that is currently waiting
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
282 if (zforce_setconfig(ts, SETCONFIG_DUALTOUCH)) {
283 dev_err(&client->dev, "Unable to set config\n");
284 goto error;
285 }
286
287 /* start sending touch events */
288 ret = zforce_command(ts, COMMAND_DATAREQUEST);
289 if (ret) {
290 dev_err(&client->dev, "Unable to request data\n");
291 goto error;
292 }
293
294 /*
295 * Per NN, initial cal. take max. of 200msec.
296 * Allow time to complete this calibration
297 */
298 msleep(200);
299
300 return 0;
301
302error:
303 zforce_command_wait(ts, COMMAND_DEACTIVATE);
304 return ret;
305}
306
307static int zforce_stop(struct zforce_ts *ts)
308{
309 struct i2c_client *client = ts->client;
310 int ret;
311
312 dev_dbg(&client->dev, "stopping device\n");
313
314 /* Deactivates touch sensing and puts the device into sleep. */
315 ret = zforce_command_wait(ts, COMMAND_DEACTIVATE);
316 if (ret != 0) {
317 dev_err(&client->dev, "could not deactivate device, %d\n",
318 ret);
319 return ret;
320 }
321
322 return 0;
323}
324
325static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
326{
327 struct i2c_client *client = ts->client;
328 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
329 struct zforce_point point;
330 int count, i, num = 0;
331
332 count = payload[0];
333 if (count > ZFORCE_REPORT_POINTS) {
334 dev_warn(&client->dev, "to many coordinates %d, expected max %d\n",
335 count, ZFORCE_REPORT_POINTS);
336 count = ZFORCE_REPORT_POINTS;
337 }
338
339 for (i = 0; i < count; i++) {
340 point.coord_x =
341 payload[9 * i + 2] << 8 | payload[9 * i + 1];
342 point.coord_y =
343 payload[9 * i + 4] << 8 | payload[9 * i + 3];
344
345 if (point.coord_x > pdata->x_max ||
346 point.coord_y > pdata->y_max) {
347 dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
348 point.coord_x, point.coord_y);
349 point.coord_x = point.coord_y = 0;
350 }
351
352 point.state = payload[9 * i + 5] & 0x03;
353 point.id = (payload[9 * i + 5] & 0xfc) >> 2;
354
355 /* determine touch major, minor and orientation */
356 point.area_major = max(payload[9 * i + 6],
357 payload[9 * i + 7]);
358 point.area_minor = min(payload[9 * i + 6],
359 payload[9 * i + 7]);
360 point.orientation = payload[9 * i + 6] > payload[9 * i + 7];
361
362 point.pressure = payload[9 * i + 8];
363 point.prblty = payload[9 * i + 9];
364
365 dev_dbg(&client->dev,
366 "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n",
367 i, count, point.state, point.id,
368 point.pressure, point.prblty,
369 point.coord_x, point.coord_y,
370 point.area_major, point.area_minor,
371 point.orientation);
372
373 /* the zforce id starts with "1", so needs to be decreased */
374 input_mt_slot(ts->input, point.id - 1);
375
376 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER,
377 point.state != STATE_UP);
378
379 if (point.state != STATE_UP) {
380 input_report_abs(ts->input, ABS_MT_POSITION_X,
381 point.coord_x);
382 input_report_abs(ts->input, ABS_MT_POSITION_Y,
383 point.coord_y);
384 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
385 point.area_major);
386 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
387 point.area_minor);
388 input_report_abs(ts->input, ABS_MT_ORIENTATION,
389 point.orientation);
390 num++;
391 }
392 }
393
394 input_mt_sync_frame(ts->input);
395
396 input_mt_report_finger_count(ts->input, num);
397
398 input_sync(ts->input);
399
400 return 0;
401}
402
403static int zforce_read_packet(struct zforce_ts *ts, u8 *buf)
404{
405 struct i2c_client *client = ts->client;
406 int ret;
407
408 mutex_lock(&ts->access_mutex);
409
410 /* read 2 byte message header */
411 ret = i2c_master_recv(client, buf, 2);
412 if (ret < 0) {
413 dev_err(&client->dev, "error reading header: %d\n", ret);
414 goto unlock;
415 }
416
417 if (buf[PAYLOAD_HEADER] != FRAME_START) {
418 dev_err(&client->dev, "invalid frame start: %d\n", buf[0]);
419 ret = -EIO;
420 goto unlock;
421 }
422
423 if (buf[PAYLOAD_LENGTH] <= 0 || buf[PAYLOAD_LENGTH] > 255) {
424 dev_err(&client->dev, "invalid payload length: %d\n",
425 buf[PAYLOAD_LENGTH]);
426 ret = -EIO;
427 goto unlock;
428 }
429
430 /* read the message */
431 ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]);
432 if (ret < 0) {
433 dev_err(&client->dev, "error reading payload: %d\n", ret);
434 goto unlock;
435 }
436
437 dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n",
438 buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]);
439
440unlock:
441 mutex_unlock(&ts->access_mutex);
442 return ret;
443}
444
445static void zforce_complete(struct zforce_ts *ts, int cmd, int result)
446{
447 struct i2c_client *client = ts->client;
448
449 if (ts->command_waiting == cmd) {
450 dev_dbg(&client->dev, "completing command 0x%x\n", cmd);
451 ts->command_result = result;
452 complete(&ts->command_done);
453 } else {
454 dev_dbg(&client->dev, "command %d not for us\n", cmd);
455 }
456}
457
458static irqreturn_t zforce_interrupt(int irq, void *dev_id)
459{
460 struct zforce_ts *ts = dev_id;
461 struct i2c_client *client = ts->client;
462 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
463 int ret;
464 u8 payload_buffer[512];
465 u8 *payload;
466
467 /*
468 * When suspended, emit a wakeup signal if necessary and return.
469 * Due to the level-interrupt we will get re-triggered later.
470 */
471 if (ts->suspended) {
472 if (device_may_wakeup(&client->dev))
473 pm_wakeup_event(&client->dev, 500);
474 msleep(20);
475 return IRQ_HANDLED;
476 }
477
478 dev_dbg(&client->dev, "handling interrupt\n");
479
480 /* Don't emit wakeup events from commands run by zforce_suspend */
481 if (!ts->suspending && device_may_wakeup(&client->dev))
482 pm_stay_awake(&client->dev);
483
484 while (!gpio_get_value(pdata->gpio_int)) {
485 ret = zforce_read_packet(ts, payload_buffer);
486 if (ret < 0) {
487 dev_err(&client->dev, "could not read packet, ret: %d\n",
488 ret);
489 break;
490 }
491
492 payload = &payload_buffer[PAYLOAD_BODY];
493
494 switch (payload[RESPONSE_ID]) {
495 case NOTIFICATION_TOUCH:
496 /*
497 * Always report touch-events received while
498 * suspending, when being a wakeup source
499 */
500 if (ts->suspending && device_may_wakeup(&client->dev))
501 pm_wakeup_event(&client->dev, 500);
502 zforce_touch_event(ts, &payload[RESPONSE_DATA]);
503 break;
504
505 case NOTIFICATION_BOOTCOMPLETE:
506 ts->boot_complete = payload[RESPONSE_DATA];
507 zforce_complete(ts, payload[RESPONSE_ID], 0);
508 break;
509
510 case RESPONSE_INITIALIZE:
511 case RESPONSE_DEACTIVATE:
512 case RESPONSE_SETCONFIG:
513 case RESPONSE_RESOLUTION:
514 case RESPONSE_SCANFREQ:
515 zforce_complete(ts, payload[RESPONSE_ID],
516 payload[RESPONSE_DATA]);
517 break;
518
519 case RESPONSE_STATUS:
520 /*
521 * Version Payload Results
522 * [2:major] [2:minor] [2:build] [2:rev]
523 */
524 ts->version_major = (payload[RESPONSE_DATA + 1] << 8) |
525 payload[RESPONSE_DATA];
526 ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) |
527 payload[RESPONSE_DATA + 2];
528 ts->version_build = (payload[RESPONSE_DATA + 5] << 8) |
529 payload[RESPONSE_DATA + 4];
530 ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) |
531 payload[RESPONSE_DATA + 6];
532 dev_dbg(&ts->client->dev, "Firmware Version %04x:%04x %04x:%04x\n",
533 ts->version_major, ts->version_minor,
534 ts->version_build, ts->version_rev);
535
536 zforce_complete(ts, payload[RESPONSE_ID], 0);
537 break;
538
539 case NOTIFICATION_INVALID_COMMAND:
540 dev_err(&ts->client->dev, "invalid command: 0x%x\n",
541 payload[RESPONSE_DATA]);
542 break;
543
544 default:
545 dev_err(&ts->client->dev, "unrecognized response id: 0x%x\n",
546 payload[RESPONSE_ID]);
547 break;
548 }
549 }
550
551 if (!ts->suspending && device_may_wakeup(&client->dev))
552 pm_relax(&client->dev);
553
554 dev_dbg(&client->dev, "finished interrupt\n");
555
556 return IRQ_HANDLED;
557}
558
559static int zforce_input_open(struct input_dev *dev)
560{
561 struct zforce_ts *ts = input_get_drvdata(dev);
562 int ret;
563
564 ret = zforce_start(ts);
565 if (ret)
566 return ret;
567
568 return 0;
569}
570
571static void zforce_input_close(struct input_dev *dev)
572{
573 struct zforce_ts *ts = input_get_drvdata(dev);
574 struct i2c_client *client = ts->client;
575 int ret;
576
577 ret = zforce_stop(ts);
578 if (ret)
579 dev_warn(&client->dev, "stopping zforce failed\n");
580
581 return;
582}
583
584#ifdef CONFIG_PM_SLEEP
585static int zforce_suspend(struct device *dev)
586{
587 struct i2c_client *client = to_i2c_client(dev);
588 struct zforce_ts *ts = i2c_get_clientdata(client);
589 struct input_dev *input = ts->input;
590 int ret = 0;
591
592 mutex_lock(&input->mutex);
593 ts->suspending = true;
594
595 /*
596 * When configured as a wakeup source device should always wake
597 * the system, therefore start device if necessary.
598 */
599 if (device_may_wakeup(&client->dev)) {
600 dev_dbg(&client->dev, "suspend while being a wakeup source\n");
601
602 /* Need to start device, if not open, to be a wakeup source. */
603 if (!input->users) {
604 ret = zforce_start(ts);
605 if (ret)
606 goto unlock;
607 }
608
609 enable_irq_wake(client->irq);
610 } else if (input->users) {
611 dev_dbg(&client->dev, "suspend without being a wakeup source\n");
612
613 ret = zforce_stop(ts);
614 if (ret)
615 goto unlock;
616
617 disable_irq(client->irq);
618 }
619
620 ts->suspended = true;
621
622unlock:
623 ts->suspending = false;
624 mutex_unlock(&input->mutex);
625
626 return ret;
627}
628
629static int zforce_resume(struct device *dev)
630{
631 struct i2c_client *client = to_i2c_client(dev);
632 struct zforce_ts *ts = i2c_get_clientdata(client);
633 struct input_dev *input = ts->input;
634 int ret = 0;
635
636 mutex_lock(&input->mutex);
637
638 ts->suspended = false;
639
640 if (device_may_wakeup(&client->dev)) {
641 dev_dbg(&client->dev, "resume from being a wakeup source\n");
642
643 disable_irq_wake(client->irq);
644
645 /* need to stop device if it was not open on suspend */
646 if (!input->users) {
647 ret = zforce_stop(ts);
648 if (ret)
649 goto unlock;
650 }
651 } else if (input->users) {
652 dev_dbg(&client->dev, "resume without being a wakeup source\n");
653
654 enable_irq(client->irq);
655
656 ret = zforce_start(ts);
657 if (ret < 0)
658 goto unlock;
659 }
660
661unlock:
662 mutex_unlock(&input->mutex);
663
664 return ret;
665}
666#endif
667
668static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume);
669
670static void zforce_reset(void *data)
671{
672 struct zforce_ts *ts = data;
673
674 gpio_set_value(ts->pdata->gpio_rst, 0);
675}
676
677static int zforce_probe(struct i2c_client *client,
678 const struct i2c_device_id *id)
679{
680 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
681 struct zforce_ts *ts;
682 struct input_dev *input_dev;
683 int ret;
684
685 if (!pdata)
686 return -EINVAL;
687
688 ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL);
689 if (!ts)
690 return -ENOMEM;
691
692 ret = devm_gpio_request_one(&client->dev, pdata->gpio_int, GPIOF_IN,
693 "zforce_ts_int");
694 if (ret) {
695 dev_err(&client->dev, "request of gpio %d failed, %d\n",
696 pdata->gpio_int, ret);
697 return ret;
698 }
699
700 ret = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
701 GPIOF_OUT_INIT_LOW, "zforce_ts_rst");
702 if (ret) {
703 dev_err(&client->dev, "request of gpio %d failed, %d\n",
704 pdata->gpio_rst, ret);
705 return ret;
706 }
707
708 ret = devm_add_action(&client->dev, zforce_reset, ts);
709 if (ret) {
710 dev_err(&client->dev, "failed to register reset action, %d\n",
711 ret);
712 return ret;
713 }
714
715 snprintf(ts->phys, sizeof(ts->phys),
716 "%s/input0", dev_name(&client->dev));
717
718 input_dev = devm_input_allocate_device(&client->dev);
719 if (!input_dev) {
720 dev_err(&client->dev, "could not allocate input device\n");
721 return -ENOMEM;
722 }
723
724 mutex_init(&ts->access_mutex);
725 mutex_init(&ts->command_mutex);
726
727 ts->pdata = pdata;
728 ts->client = client;
729 ts->input = input_dev;
730
731 input_dev->name = "Neonode zForce touchscreen";
732 input_dev->phys = ts->phys;
733 input_dev->id.bustype = BUS_I2C;
734
735 input_dev->open = zforce_input_open;
736 input_dev->close = zforce_input_close;
737
738 __set_bit(EV_KEY, input_dev->evbit);
739 __set_bit(EV_SYN, input_dev->evbit);
740 __set_bit(EV_ABS, input_dev->evbit);
741
742 /* For multi touch */
743 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
744 pdata->x_max, 0, 0);
745 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
746 pdata->y_max, 0, 0);
747
748 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
749 ZFORCE_MAX_AREA, 0, 0);
750 input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
751 ZFORCE_MAX_AREA, 0, 0);
752 input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
753 input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT);
754
755 input_set_drvdata(ts->input, ts);
756
757 init_completion(&ts->command_done);
758
759 /*
760 * The zforce pulls the interrupt low when it has data ready.
761 * After it is triggered the isr thread runs until all the available
762 * packets have been read and the interrupt is high again.
763 * Therefore we can trigger the interrupt anytime it is low and do
764 * not need to limit it to the interrupt edge.
765 */
766 ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
767 zforce_interrupt,
768 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
769 input_dev->name, ts);
770 if (ret) {
771 dev_err(&client->dev, "irq %d request failed\n", client->irq);
772 return ret;
773 }
774
775 i2c_set_clientdata(client, ts);
776
777 /* let the controller boot */
778 gpio_set_value(pdata->gpio_rst, 1);
779
780 ts->command_waiting = NOTIFICATION_BOOTCOMPLETE;
781 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0)
782 dev_warn(&client->dev, "bootcomplete timed out\n");
783
784 /* need to start device to get version information */
785 ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
786 if (ret) {
787 dev_err(&client->dev, "unable to initialize, %d\n", ret);
788 return ret;
789 }
790
791 /* this gets the firmware version among other informations */
792 ret = zforce_command_wait(ts, COMMAND_STATUS);
793 if (ret < 0) {
794 dev_err(&client->dev, "couldn't get status, %d\n", ret);
795 zforce_stop(ts);
796 return ret;
797 }
798
799 /* stop device and put it into sleep until it is opened */
800 ret = zforce_stop(ts);
801 if (ret < 0)
802 return ret;
803
804 device_set_wakeup_capable(&client->dev, true);
805
806 ret = input_register_device(input_dev);
807 if (ret) {
808 dev_err(&client->dev, "could not register input device, %d\n",
809 ret);
810 return ret;
811 }
812
813 return 0;
814}
815
816static struct i2c_device_id zforce_idtable[] = {
817 { "zforce-ts", 0 },
818 { }
819};
820MODULE_DEVICE_TABLE(i2c, zforce_idtable);
821
822static struct i2c_driver zforce_driver = {
823 .driver = {
824 .owner = THIS_MODULE,
825 .name = "zforce-ts",
826 .pm = &zforce_pm_ops,
827 },
828 .probe = zforce_probe,
829 .id_table = zforce_idtable,
830};
831
832module_i2c_driver(zforce_driver);
833
834MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
835MODULE_DESCRIPTION("zForce TouchScreen Driver");
836MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/zforce_ts.h b/include/linux/platform_data/zforce_ts.h
new file mode 100644
index 000000000000..0472ab2f6ede
--- /dev/null
+++ b/include/linux/platform_data/zforce_ts.h
@@ -0,0 +1,26 @@
1/* drivers/input/touchscreen/zforce.c
2 *
3 * Copyright (C) 2012-2013 MundoReader S.L.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#ifndef _LINUX_INPUT_ZFORCE_TS_H
16#define _LINUX_INPUT_ZFORCE_TS_H
17
18struct zforce_ts_platdata {
19 int gpio_int;
20 int gpio_rst;
21
22 unsigned int x_max;
23 unsigned int y_max;
24};
25
26#endif /* _LINUX_INPUT_ZFORCE_TS_H */