1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012-2013 MundoReader S.L.
4 * Author: Heiko Stuebner <heiko@sntech.de>
5 *
6 * based in parts on Nook zforce driver
7 *
8 * Copyright (C) 2010 Barnes & Noble, Inc.
9 * Author: Pieter Truter<ptruter@intrinsyc.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/hrtimer.h>
14 #include <linux/slab.h>
15 #include <linux/input.h>
16 #include <linux/interrupt.h>
17 #include <linux/i2c.h>
18 #include <linux/delay.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/device.h>
21 #include <linux/sysfs.h>
22 #include <linux/input/mt.h>
23 #include <linux/platform_data/zforce_ts.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/of.h>
26
27 #define WAIT_TIMEOUT msecs_to_jiffies(1000)
28
29 #define FRAME_START 0xee
30 #define FRAME_MAXSIZE 257
31
32 /* Offsets of the different parts of the payload the controller sends */
33 #define PAYLOAD_HEADER 0
34 #define PAYLOAD_LENGTH 1
35 #define PAYLOAD_BODY 2
36
37 /* Response offsets */
38 #define RESPONSE_ID 0
39 #define RESPONSE_DATA 1
40
41 /* Commands */
42 #define COMMAND_DEACTIVATE 0x00
43 #define COMMAND_INITIALIZE 0x01
44 #define COMMAND_RESOLUTION 0x02
45 #define COMMAND_SETCONFIG 0x03
46 #define COMMAND_DATAREQUEST 0x04
47 #define COMMAND_SCANFREQ 0x08
48 #define COMMAND_STATUS 0X1e
49
50 /*
51 * Responses the controller sends as a result of
52 * command requests
53 */
54 #define RESPONSE_DEACTIVATE 0x00
55 #define RESPONSE_INITIALIZE 0x01
56 #define RESPONSE_RESOLUTION 0x02
57 #define RESPONSE_SETCONFIG 0x03
58 #define RESPONSE_SCANFREQ 0x08
59 #define RESPONSE_STATUS 0X1e
60
61 /*
62 * Notifications are sent by the touch controller without
63 * being requested by the driver and include for example
64 * touch indications
65 */
66 #define NOTIFICATION_TOUCH 0x04
67 #define NOTIFICATION_BOOTCOMPLETE 0x07
68 #define NOTIFICATION_OVERRUN 0x25
69 #define NOTIFICATION_PROXIMITY 0x26
70 #define NOTIFICATION_INVALID_COMMAND 0xfe
71
72 #define ZFORCE_REPORT_POINTS 2
73 #define ZFORCE_MAX_AREA 0xff
74
75 #define STATE_DOWN 0
76 #define STATE_MOVE 1
77 #define STATE_UP 2
78
79 #define SETCONFIG_DUALTOUCH (1 << 0)
80
81 struct zforce_point {
82 int coord_x;
83 int coord_y;
84 int state;
85 int id;
86 int area_major;
87 int area_minor;
88 int orientation;
89 int pressure;
90 int prblty;
91 };
92
93 /*
94 * @client the i2c_client
95 * @input the input device
96 * @suspending in the process of going to suspend (don't emit wakeup
97 * events for commands executed to suspend the device)
98 * @suspended device suspended
99 * @access_mutex serialize i2c-access, to keep multipart reads together
100 * @command_done completion to wait for the command result
101 * @command_mutex serialize commands sent to the ic
102 * @command_waiting the id of the command that is currently waiting
103 * for a result
104 * @command_result returned result of the command
105 */
106 struct zforce_ts {
107 struct i2c_client *client;
108 struct input_dev *input;
109 const struct zforce_ts_platdata *pdata;
110 char phys[32];
111
112 struct regulator *reg_vdd;
113
114 struct gpio_desc *gpio_int;
115 struct gpio_desc *gpio_rst;
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
zforce_command(struct zforce_ts * ts,u8 cmd)135 static 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
zforce_reset_assert(struct zforce_ts * ts)158 static void zforce_reset_assert(struct zforce_ts *ts)
159 {
160 gpiod_set_value_cansleep(ts->gpio_rst, 1);
161 }
162
zforce_reset_deassert(struct zforce_ts * ts)163 static void zforce_reset_deassert(struct zforce_ts *ts)
164 {
165 gpiod_set_value_cansleep(ts->gpio_rst, 0);
166 }
167
zforce_send_wait(struct zforce_ts * ts,const char * buf,int len)168 static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len)
169 {
170 struct i2c_client *client = ts->client;
171 int ret;
172
173 ret = mutex_trylock(&ts->command_mutex);
174 if (!ret) {
175 dev_err(&client->dev, "already waiting for a command\n");
176 return -EBUSY;
177 }
178
179 dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n",
180 buf[1], buf[2]);
181
182 ts->command_waiting = buf[2];
183
184 mutex_lock(&ts->access_mutex);
185 ret = i2c_master_send(client, buf, len);
186 mutex_unlock(&ts->access_mutex);
187 if (ret < 0) {
188 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
189 goto unlock;
190 }
191
192 dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]);
193
194 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) {
195 ret = -ETIME;
196 goto unlock;
197 }
198
199 ret = ts->command_result;
200
201 unlock:
202 mutex_unlock(&ts->command_mutex);
203 return ret;
204 }
205
zforce_command_wait(struct zforce_ts * ts,u8 cmd)206 static int zforce_command_wait(struct zforce_ts *ts, u8 cmd)
207 {
208 struct i2c_client *client = ts->client;
209 char buf[3];
210 int ret;
211
212 dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd);
213
214 buf[0] = FRAME_START;
215 buf[1] = 1; /* data size, command only */
216 buf[2] = cmd;
217
218 ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
219 if (ret < 0) {
220 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
221 return ret;
222 }
223
224 return 0;
225 }
226
zforce_resolution(struct zforce_ts * ts,u16 x,u16 y)227 static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y)
228 {
229 struct i2c_client *client = ts->client;
230 char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION,
231 (x & 0xff), ((x >> 8) & 0xff),
232 (y & 0xff), ((y >> 8) & 0xff) };
233
234 dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y);
235
236 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
237 }
238
zforce_scan_frequency(struct zforce_ts * ts,u16 idle,u16 finger,u16 stylus)239 static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger,
240 u16 stylus)
241 {
242 struct i2c_client *client = ts->client;
243 char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ,
244 (idle & 0xff), ((idle >> 8) & 0xff),
245 (finger & 0xff), ((finger >> 8) & 0xff),
246 (stylus & 0xff), ((stylus >> 8) & 0xff) };
247
248 dev_dbg(&client->dev,
249 "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n",
250 idle, finger, stylus);
251
252 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
253 }
254
zforce_setconfig(struct zforce_ts * ts,char b1)255 static int zforce_setconfig(struct zforce_ts *ts, char b1)
256 {
257 struct i2c_client *client = ts->client;
258 char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG,
259 b1, 0, 0, 0 };
260
261 dev_dbg(&client->dev, "set config to (%d)\n", b1);
262
263 return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
264 }
265
zforce_start(struct zforce_ts * ts)266 static int zforce_start(struct zforce_ts *ts)
267 {
268 struct i2c_client *client = ts->client;
269 const struct zforce_ts_platdata *pdata = ts->pdata;
270 int ret;
271
272 dev_dbg(&client->dev, "starting device\n");
273
274 ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
275 if (ret) {
276 dev_err(&client->dev, "Unable to initialize, %d\n", ret);
277 return ret;
278 }
279
280 ret = zforce_resolution(ts, pdata->x_max, pdata->y_max);
281 if (ret) {
282 dev_err(&client->dev, "Unable to set resolution, %d\n", ret);
283 goto error;
284 }
285
286 ret = zforce_scan_frequency(ts, 10, 50, 50);
287 if (ret) {
288 dev_err(&client->dev, "Unable to set scan frequency, %d\n",
289 ret);
290 goto error;
291 }
292
293 ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH);
294 if (ret) {
295 dev_err(&client->dev, "Unable to set config\n");
296 goto error;
297 }
298
299 /* start sending touch events */
300 ret = zforce_command(ts, COMMAND_DATAREQUEST);
301 if (ret) {
302 dev_err(&client->dev, "Unable to request data\n");
303 goto error;
304 }
305
306 /*
307 * Per NN, initial cal. take max. of 200msec.
308 * Allow time to complete this calibration
309 */
310 msleep(200);
311
312 return 0;
313
314 error:
315 zforce_command_wait(ts, COMMAND_DEACTIVATE);
316 return ret;
317 }
318
zforce_stop(struct zforce_ts * ts)319 static int zforce_stop(struct zforce_ts *ts)
320 {
321 struct i2c_client *client = ts->client;
322 int ret;
323
324 dev_dbg(&client->dev, "stopping device\n");
325
326 /* Deactivates touch sensing and puts the device into sleep. */
327 ret = zforce_command_wait(ts, COMMAND_DEACTIVATE);
328 if (ret != 0) {
329 dev_err(&client->dev, "could not deactivate device, %d\n",
330 ret);
331 return ret;
332 }
333
334 return 0;
335 }
336
zforce_touch_event(struct zforce_ts * ts,u8 * payload)337 static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
338 {
339 struct i2c_client *client = ts->client;
340 const struct zforce_ts_platdata *pdata = ts->pdata;
341 struct zforce_point point;
342 int count, i, num = 0;
343
344 count = payload[0];
345 if (count > ZFORCE_REPORT_POINTS) {
346 dev_warn(&client->dev,
347 "too many coordinates %d, expected max %d\n",
348 count, ZFORCE_REPORT_POINTS);
349 count = ZFORCE_REPORT_POINTS;
350 }
351
352 for (i = 0; i < count; i++) {
353 point.coord_x =
354 payload[9 * i + 2] << 8 | payload[9 * i + 1];
355 point.coord_y =
356 payload[9 * i + 4] << 8 | payload[9 * i + 3];
357
358 if (point.coord_x > pdata->x_max ||
359 point.coord_y > pdata->y_max) {
360 dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
361 point.coord_x, point.coord_y);
362 point.coord_x = point.coord_y = 0;
363 }
364
365 point.state = payload[9 * i + 5] & 0x0f;
366 point.id = (payload[9 * i + 5] & 0xf0) >> 4;
367
368 /* determine touch major, minor and orientation */
369 point.area_major = max(payload[9 * i + 6],
370 payload[9 * i + 7]);
371 point.area_minor = min(payload[9 * i + 6],
372 payload[9 * i + 7]);
373 point.orientation = payload[9 * i + 6] > payload[9 * i + 7];
374
375 point.pressure = payload[9 * i + 8];
376 point.prblty = payload[9 * i + 9];
377
378 dev_dbg(&client->dev,
379 "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n",
380 i, count, point.state, point.id,
381 point.pressure, point.prblty,
382 point.coord_x, point.coord_y,
383 point.area_major, point.area_minor,
384 point.orientation);
385
386 /* the zforce id starts with "1", so needs to be decreased */
387 input_mt_slot(ts->input, point.id - 1);
388
389 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER,
390 point.state != STATE_UP);
391
392 if (point.state != STATE_UP) {
393 input_report_abs(ts->input, ABS_MT_POSITION_X,
394 point.coord_x);
395 input_report_abs(ts->input, ABS_MT_POSITION_Y,
396 point.coord_y);
397 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
398 point.area_major);
399 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
400 point.area_minor);
401 input_report_abs(ts->input, ABS_MT_ORIENTATION,
402 point.orientation);
403 num++;
404 }
405 }
406
407 input_mt_sync_frame(ts->input);
408
409 input_mt_report_finger_count(ts->input, num);
410
411 input_sync(ts->input);
412
413 return 0;
414 }
415
zforce_read_packet(struct zforce_ts * ts,u8 * buf)416 static int zforce_read_packet(struct zforce_ts *ts, u8 *buf)
417 {
418 struct i2c_client *client = ts->client;
419 int ret;
420
421 mutex_lock(&ts->access_mutex);
422
423 /* read 2 byte message header */
424 ret = i2c_master_recv(client, buf, 2);
425 if (ret < 0) {
426 dev_err(&client->dev, "error reading header: %d\n", ret);
427 goto unlock;
428 }
429
430 if (buf[PAYLOAD_HEADER] != FRAME_START) {
431 dev_err(&client->dev, "invalid frame start: %d\n", buf[0]);
432 ret = -EIO;
433 goto unlock;
434 }
435
436 if (buf[PAYLOAD_LENGTH] == 0) {
437 dev_err(&client->dev, "invalid payload length: %d\n",
438 buf[PAYLOAD_LENGTH]);
439 ret = -EIO;
440 goto unlock;
441 }
442
443 /* read the message */
444 ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]);
445 if (ret < 0) {
446 dev_err(&client->dev, "error reading payload: %d\n", ret);
447 goto unlock;
448 }
449
450 dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n",
451 buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]);
452
453 unlock:
454 mutex_unlock(&ts->access_mutex);
455 return ret;
456 }
457
zforce_complete(struct zforce_ts * ts,int cmd,int result)458 static void zforce_complete(struct zforce_ts *ts, int cmd, int result)
459 {
460 struct i2c_client *client = ts->client;
461
462 if (ts->command_waiting == cmd) {
463 dev_dbg(&client->dev, "completing command 0x%x\n", cmd);
464 ts->command_result = result;
465 complete(&ts->command_done);
466 } else {
467 dev_dbg(&client->dev, "command %d not for us\n", cmd);
468 }
469 }
470
zforce_irq(int irq,void * dev_id)471 static irqreturn_t zforce_irq(int irq, void *dev_id)
472 {
473 struct zforce_ts *ts = dev_id;
474 struct i2c_client *client = ts->client;
475
476 if (ts->suspended && device_may_wakeup(&client->dev))
477 pm_wakeup_event(&client->dev, 500);
478
479 return IRQ_WAKE_THREAD;
480 }
481
zforce_irq_thread(int irq,void * dev_id)482 static irqreturn_t zforce_irq_thread(int irq, void *dev_id)
483 {
484 struct zforce_ts *ts = dev_id;
485 struct i2c_client *client = ts->client;
486 int ret;
487 u8 payload_buffer[FRAME_MAXSIZE];
488 u8 *payload;
489
490 /*
491 * When still suspended, return.
492 * Due to the level-interrupt we will get re-triggered later.
493 */
494 if (ts->suspended) {
495 msleep(20);
496 return IRQ_HANDLED;
497 }
498
499 dev_dbg(&client->dev, "handling interrupt\n");
500
501 /* Don't emit wakeup events from commands run by zforce_suspend */
502 if (!ts->suspending && device_may_wakeup(&client->dev))
503 pm_stay_awake(&client->dev);
504
505 /*
506 * Run at least once and exit the loop if
507 * - the optional interrupt GPIO isn't specified
508 * (there is only one packet read per ISR invocation, then)
509 * or
510 * - the GPIO isn't active any more
511 * (packet read until the level GPIO indicates that there is
512 * no IRQ any more)
513 */
514 do {
515 ret = zforce_read_packet(ts, payload_buffer);
516 if (ret < 0) {
517 dev_err(&client->dev,
518 "could not read packet, ret: %d\n", ret);
519 break;
520 }
521
522 payload = &payload_buffer[PAYLOAD_BODY];
523
524 switch (payload[RESPONSE_ID]) {
525 case NOTIFICATION_TOUCH:
526 /*
527 * Always report touch-events received while
528 * suspending, when being a wakeup source
529 */
530 if (ts->suspending && device_may_wakeup(&client->dev))
531 pm_wakeup_event(&client->dev, 500);
532 zforce_touch_event(ts, &payload[RESPONSE_DATA]);
533 break;
534
535 case NOTIFICATION_BOOTCOMPLETE:
536 ts->boot_complete = payload[RESPONSE_DATA];
537 zforce_complete(ts, payload[RESPONSE_ID], 0);
538 break;
539
540 case RESPONSE_INITIALIZE:
541 case RESPONSE_DEACTIVATE:
542 case RESPONSE_SETCONFIG:
543 case RESPONSE_RESOLUTION:
544 case RESPONSE_SCANFREQ:
545 zforce_complete(ts, payload[RESPONSE_ID],
546 payload[RESPONSE_DATA]);
547 break;
548
549 case RESPONSE_STATUS:
550 /*
551 * Version Payload Results
552 * [2:major] [2:minor] [2:build] [2:rev]
553 */
554 ts->version_major = (payload[RESPONSE_DATA + 1] << 8) |
555 payload[RESPONSE_DATA];
556 ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) |
557 payload[RESPONSE_DATA + 2];
558 ts->version_build = (payload[RESPONSE_DATA + 5] << 8) |
559 payload[RESPONSE_DATA + 4];
560 ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) |
561 payload[RESPONSE_DATA + 6];
562 dev_dbg(&ts->client->dev,
563 "Firmware Version %04x:%04x %04x:%04x\n",
564 ts->version_major, ts->version_minor,
565 ts->version_build, ts->version_rev);
566
567 zforce_complete(ts, payload[RESPONSE_ID], 0);
568 break;
569
570 case NOTIFICATION_INVALID_COMMAND:
571 dev_err(&ts->client->dev, "invalid command: 0x%x\n",
572 payload[RESPONSE_DATA]);
573 break;
574
575 default:
576 dev_err(&ts->client->dev,
577 "unrecognized response id: 0x%x\n",
578 payload[RESPONSE_ID]);
579 break;
580 }
581 } while (gpiod_get_value_cansleep(ts->gpio_int));
582
583 if (!ts->suspending && device_may_wakeup(&client->dev))
584 pm_relax(&client->dev);
585
586 dev_dbg(&client->dev, "finished interrupt\n");
587
588 return IRQ_HANDLED;
589 }
590
zforce_input_open(struct input_dev * dev)591 static int zforce_input_open(struct input_dev *dev)
592 {
593 struct zforce_ts *ts = input_get_drvdata(dev);
594
595 return zforce_start(ts);
596 }
597
zforce_input_close(struct input_dev * dev)598 static void zforce_input_close(struct input_dev *dev)
599 {
600 struct zforce_ts *ts = input_get_drvdata(dev);
601 struct i2c_client *client = ts->client;
602 int ret;
603
604 ret = zforce_stop(ts);
605 if (ret)
606 dev_warn(&client->dev, "stopping zforce failed\n");
607
608 return;
609 }
610
zforce_suspend(struct device * dev)611 static int zforce_suspend(struct device *dev)
612 {
613 struct i2c_client *client = to_i2c_client(dev);
614 struct zforce_ts *ts = i2c_get_clientdata(client);
615 struct input_dev *input = ts->input;
616 int ret = 0;
617
618 mutex_lock(&input->mutex);
619 ts->suspending = true;
620
621 /*
622 * When configured as a wakeup source device should always wake
623 * the system, therefore start device if necessary.
624 */
625 if (device_may_wakeup(&client->dev)) {
626 dev_dbg(&client->dev, "suspend while being a wakeup source\n");
627
628 /* Need to start device, if not open, to be a wakeup source. */
629 if (!input_device_enabled(input)) {
630 ret = zforce_start(ts);
631 if (ret)
632 goto unlock;
633 }
634
635 enable_irq_wake(client->irq);
636 } else if (input_device_enabled(input)) {
637 dev_dbg(&client->dev,
638 "suspend without being a wakeup source\n");
639
640 ret = zforce_stop(ts);
641 if (ret)
642 goto unlock;
643
644 disable_irq(client->irq);
645 }
646
647 ts->suspended = true;
648
649 unlock:
650 ts->suspending = false;
651 mutex_unlock(&input->mutex);
652
653 return ret;
654 }
655
zforce_resume(struct device * dev)656 static int zforce_resume(struct device *dev)
657 {
658 struct i2c_client *client = to_i2c_client(dev);
659 struct zforce_ts *ts = i2c_get_clientdata(client);
660 struct input_dev *input = ts->input;
661 int ret = 0;
662
663 mutex_lock(&input->mutex);
664
665 ts->suspended = false;
666
667 if (device_may_wakeup(&client->dev)) {
668 dev_dbg(&client->dev, "resume from being a wakeup source\n");
669
670 disable_irq_wake(client->irq);
671
672 /* need to stop device if it was not open on suspend */
673 if (!input_device_enabled(input)) {
674 ret = zforce_stop(ts);
675 if (ret)
676 goto unlock;
677 }
678 } else if (input_device_enabled(input)) {
679 dev_dbg(&client->dev, "resume without being a wakeup source\n");
680
681 enable_irq(client->irq);
682
683 ret = zforce_start(ts);
684 if (ret < 0)
685 goto unlock;
686 }
687
688 unlock:
689 mutex_unlock(&input->mutex);
690
691 return ret;
692 }
693
694 static DEFINE_SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume);
695
zforce_reset(void * data)696 static void zforce_reset(void *data)
697 {
698 struct zforce_ts *ts = data;
699
700 zforce_reset_assert(ts);
701
702 udelay(10);
703
704 if (!IS_ERR(ts->reg_vdd))
705 regulator_disable(ts->reg_vdd);
706 }
707
zforce_parse_dt(struct device * dev)708 static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev)
709 {
710 struct zforce_ts_platdata *pdata;
711 struct device_node *np = dev->of_node;
712
713 if (!np)
714 return ERR_PTR(-ENOENT);
715
716 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
717 if (!pdata) {
718 dev_err(dev, "failed to allocate platform data\n");
719 return ERR_PTR(-ENOMEM);
720 }
721
722 if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
723 dev_err(dev, "failed to get x-size property\n");
724 return ERR_PTR(-EINVAL);
725 }
726
727 if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
728 dev_err(dev, "failed to get y-size property\n");
729 return ERR_PTR(-EINVAL);
730 }
731
732 return pdata;
733 }
734
zforce_probe(struct i2c_client * client)735 static int zforce_probe(struct i2c_client *client)
736 {
737 const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
738 struct zforce_ts *ts;
739 struct input_dev *input_dev;
740 int ret;
741
742 if (!pdata) {
743 pdata = zforce_parse_dt(&client->dev);
744 if (IS_ERR(pdata))
745 return PTR_ERR(pdata);
746 }
747
748 ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL);
749 if (!ts)
750 return -ENOMEM;
751
752 ts->gpio_rst = devm_gpiod_get_optional(&client->dev, "reset",
753 GPIOD_OUT_HIGH);
754 if (IS_ERR(ts->gpio_rst)) {
755 ret = PTR_ERR(ts->gpio_rst);
756 dev_err(&client->dev,
757 "failed to request reset GPIO: %d\n", ret);
758 return ret;
759 }
760
761 if (ts->gpio_rst) {
762 ts->gpio_int = devm_gpiod_get_optional(&client->dev, "irq",
763 GPIOD_IN);
764 if (IS_ERR(ts->gpio_int)) {
765 ret = PTR_ERR(ts->gpio_int);
766 dev_err(&client->dev,
767 "failed to request interrupt GPIO: %d\n", ret);
768 return ret;
769 }
770 } else {
771 /*
772 * Deprecated GPIO handling for compatibility
773 * with legacy binding.
774 */
775
776 /* INT GPIO */
777 ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0,
778 GPIOD_IN);
779 if (IS_ERR(ts->gpio_int)) {
780 ret = PTR_ERR(ts->gpio_int);
781 dev_err(&client->dev,
782 "failed to request interrupt GPIO: %d\n", ret);
783 return ret;
784 }
785
786 /* RST GPIO */
787 ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1,
788 GPIOD_OUT_HIGH);
789 if (IS_ERR(ts->gpio_rst)) {
790 ret = PTR_ERR(ts->gpio_rst);
791 dev_err(&client->dev,
792 "failed to request reset GPIO: %d\n", ret);
793 return ret;
794 }
795 }
796
797 ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd");
798 if (IS_ERR(ts->reg_vdd)) {
799 ret = PTR_ERR(ts->reg_vdd);
800 if (ret == -EPROBE_DEFER)
801 return ret;
802 } else {
803 ret = regulator_enable(ts->reg_vdd);
804 if (ret)
805 return ret;
806
807 /*
808 * according to datasheet add 100us grace time after regular
809 * regulator enable delay.
810 */
811 udelay(100);
812 }
813
814 ret = devm_add_action(&client->dev, zforce_reset, ts);
815 if (ret) {
816 dev_err(&client->dev, "failed to register reset action, %d\n",
817 ret);
818
819 /* hereafter the regulator will be disabled by the action */
820 if (!IS_ERR(ts->reg_vdd))
821 regulator_disable(ts->reg_vdd);
822
823 return ret;
824 }
825
826 snprintf(ts->phys, sizeof(ts->phys),
827 "%s/input0", dev_name(&client->dev));
828
829 input_dev = devm_input_allocate_device(&client->dev);
830 if (!input_dev) {
831 dev_err(&client->dev, "could not allocate input device\n");
832 return -ENOMEM;
833 }
834
835 mutex_init(&ts->access_mutex);
836 mutex_init(&ts->command_mutex);
837
838 ts->pdata = pdata;
839 ts->client = client;
840 ts->input = input_dev;
841
842 input_dev->name = "Neonode zForce touchscreen";
843 input_dev->phys = ts->phys;
844 input_dev->id.bustype = BUS_I2C;
845
846 input_dev->open = zforce_input_open;
847 input_dev->close = zforce_input_close;
848
849 __set_bit(EV_KEY, input_dev->evbit);
850 __set_bit(EV_SYN, input_dev->evbit);
851 __set_bit(EV_ABS, input_dev->evbit);
852
853 /* For multi touch */
854 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
855 pdata->x_max, 0, 0);
856 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
857 pdata->y_max, 0, 0);
858
859 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
860 ZFORCE_MAX_AREA, 0, 0);
861 input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
862 ZFORCE_MAX_AREA, 0, 0);
863 input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
864 input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT);
865
866 input_set_drvdata(ts->input, ts);
867
868 init_completion(&ts->command_done);
869
870 /*
871 * The zforce pulls the interrupt low when it has data ready.
872 * After it is triggered the isr thread runs until all the available
873 * packets have been read and the interrupt is high again.
874 * Therefore we can trigger the interrupt anytime it is low and do
875 * not need to limit it to the interrupt edge.
876 */
877 ret = devm_request_threaded_irq(&client->dev, client->irq,
878 zforce_irq, zforce_irq_thread,
879 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
880 input_dev->name, ts);
881 if (ret) {
882 dev_err(&client->dev, "irq %d request failed\n", client->irq);
883 return ret;
884 }
885
886 i2c_set_clientdata(client, ts);
887
888 /* let the controller boot */
889 zforce_reset_deassert(ts);
890
891 ts->command_waiting = NOTIFICATION_BOOTCOMPLETE;
892 if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0)
893 dev_warn(&client->dev, "bootcomplete timed out\n");
894
895 /* need to start device to get version information */
896 ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
897 if (ret) {
898 dev_err(&client->dev, "unable to initialize, %d\n", ret);
899 return ret;
900 }
901
902 /* this gets the firmware version among other information */
903 ret = zforce_command_wait(ts, COMMAND_STATUS);
904 if (ret < 0) {
905 dev_err(&client->dev, "couldn't get status, %d\n", ret);
906 zforce_stop(ts);
907 return ret;
908 }
909
910 /* stop device and put it into sleep until it is opened */
911 ret = zforce_stop(ts);
912 if (ret < 0)
913 return ret;
914
915 device_set_wakeup_capable(&client->dev, true);
916
917 ret = input_register_device(input_dev);
918 if (ret) {
919 dev_err(&client->dev, "could not register input device, %d\n",
920 ret);
921 return ret;
922 }
923
924 return 0;
925 }
926
927 static struct i2c_device_id zforce_idtable[] = {
928 { "zforce-ts", 0 },
929 { }
930 };
931 MODULE_DEVICE_TABLE(i2c, zforce_idtable);
932
933 #ifdef CONFIG_OF
934 static const struct of_device_id zforce_dt_idtable[] = {
935 { .compatible = "neonode,zforce" },
936 {},
937 };
938 MODULE_DEVICE_TABLE(of, zforce_dt_idtable);
939 #endif
940
941 static struct i2c_driver zforce_driver = {
942 .driver = {
943 .name = "zforce-ts",
944 .pm = pm_sleep_ptr(&zforce_pm_ops),
945 .of_match_table = of_match_ptr(zforce_dt_idtable),
946 },
947 .probe = zforce_probe,
948 .id_table = zforce_idtable,
949 };
950
951 module_i2c_driver(zforce_driver);
952
953 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
954 MODULE_DESCRIPTION("zForce TouchScreen Driver");
955 MODULE_LICENSE("GPL");
956