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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 | ||
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 | ||
302 | error: | |
303 | zforce_command_wait(ts, COMMAND_DEACTIVATE); | |
304 | return ret; | |
305 | } | |
306 | ||
307 | static 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 | ||
325 | static 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 | ||
403 | static 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 | ||
440 | unlock: | |
441 | mutex_unlock(&ts->access_mutex); | |
442 | return ret; | |
443 | } | |
444 | ||
445 | static 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 | ||
458 | static 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 | ||
559 | static 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 | ||
571 | static 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 | |
585 | static 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 | ||
622 | unlock: | |
623 | ts->suspending = false; | |
624 | mutex_unlock(&input->mutex); | |
625 | ||
626 | return ret; | |
627 | } | |
628 | ||
629 | static 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 | ||
661 | unlock: | |
662 | mutex_unlock(&input->mutex); | |
663 | ||
664 | return ret; | |
665 | } | |
666 | #endif | |
667 | ||
668 | static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); | |
669 | ||
670 | static void zforce_reset(void *data) | |
671 | { | |
672 | struct zforce_ts *ts = data; | |
673 | ||
674 | gpio_set_value(ts->pdata->gpio_rst, 0); | |
675 | } | |
676 | ||
677 | static 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 | ||
816 | static struct i2c_device_id zforce_idtable[] = { | |
817 | { "zforce-ts", 0 }, | |
818 | { } | |
819 | }; | |
820 | MODULE_DEVICE_TABLE(i2c, zforce_idtable); | |
821 | ||
822 | static 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 | ||
832 | module_i2c_driver(zforce_driver); | |
833 | ||
834 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
835 | MODULE_DESCRIPTION("zForce TouchScreen Driver"); | |
836 | MODULE_LICENSE("GPL"); |