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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 | /* | |
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 | ||
86 | struct 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 | */ | |
111 | struct 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 | ||
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 | ||
158 | static 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 | ||
191 | unlock: | |
192 | mutex_unlock(&ts->command_mutex); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | static 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 | ||
217 | static 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 | ||
229 | static 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 | ||
244 | static 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 | ||
255 | static 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 | ||
303 | error: | |
304 | zforce_command_wait(ts, COMMAND_DEACTIVATE); | |
305 | return ret; | |
306 | } | |
307 | ||
308 | static 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 | ||
326 | static 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) { | |
335 | dev_warn(&client->dev, "to many coordinates %d, expected max %d\n", | |
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 | ||
404 | static 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 | ||
441 | unlock: | |
442 | mutex_unlock(&ts->access_mutex); | |
443 | return ret; | |
444 | } | |
445 | ||
446 | static 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 | ||
459 | static 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 | ||
560 | static 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 | ||
572 | static 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 | |
586 | static 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 | ||
623 | unlock: | |
624 | ts->suspending = false; | |
625 | mutex_unlock(&input->mutex); | |
626 | ||
627 | return ret; | |
628 | } | |
629 | ||
630 | static 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 | ||
662 | unlock: | |
663 | mutex_unlock(&input->mutex); | |
664 | ||
665 | return ret; | |
666 | } | |
667 | #endif | |
668 | ||
669 | static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); | |
670 | ||
671 | static void zforce_reset(void *data) | |
672 | { | |
673 | struct zforce_ts *ts = data; | |
674 | ||
675 | gpio_set_value(ts->pdata->gpio_rst, 0); | |
676 | } | |
677 | ||
678 | static 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 | ||
792 | /* this gets the firmware version among other informations */ | |
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 | ||
817 | static struct i2c_device_id zforce_idtable[] = { | |
818 | { "zforce-ts", 0 }, | |
819 | { } | |
820 | }; | |
821 | MODULE_DEVICE_TABLE(i2c, zforce_idtable); | |
822 | ||
823 | static 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 | ||
833 | module_i2c_driver(zforce_driver); | |
834 | ||
835 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
836 | MODULE_DESCRIPTION("zForce TouchScreen Driver"); | |
837 | MODULE_LICENSE("GPL"); |