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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> | |
39740370 HS |
32 | #include <linux/regulator/consumer.h> |
33 | #include <linux/delay.h> | |
6f2e6c9b HS |
34 | #include <linux/of.h> |
35 | #include <linux/of_gpio.h> | |
c6d81bd7 HS |
36 | |
37 | #define WAIT_TIMEOUT msecs_to_jiffies(1000) | |
38 | ||
39 | #define FRAME_START 0xee | |
d333b606 | 40 | #define FRAME_MAXSIZE 257 |
c6d81bd7 HS |
41 | |
42 | /* Offsets of the different parts of the payload the controller sends */ | |
43 | #define PAYLOAD_HEADER 0 | |
44 | #define PAYLOAD_LENGTH 1 | |
45 | #define PAYLOAD_BODY 2 | |
46 | ||
47 | /* Response offsets */ | |
48 | #define RESPONSE_ID 0 | |
49 | #define RESPONSE_DATA 1 | |
50 | ||
51 | /* Commands */ | |
52 | #define COMMAND_DEACTIVATE 0x00 | |
53 | #define COMMAND_INITIALIZE 0x01 | |
54 | #define COMMAND_RESOLUTION 0x02 | |
55 | #define COMMAND_SETCONFIG 0x03 | |
56 | #define COMMAND_DATAREQUEST 0x04 | |
57 | #define COMMAND_SCANFREQ 0x08 | |
58 | #define COMMAND_STATUS 0X1e | |
59 | ||
60 | /* | |
61 | * Responses the controller sends as a result of | |
62 | * command requests | |
63 | */ | |
64 | #define RESPONSE_DEACTIVATE 0x00 | |
65 | #define RESPONSE_INITIALIZE 0x01 | |
66 | #define RESPONSE_RESOLUTION 0x02 | |
67 | #define RESPONSE_SETCONFIG 0x03 | |
68 | #define RESPONSE_SCANFREQ 0x08 | |
69 | #define RESPONSE_STATUS 0X1e | |
70 | ||
71 | /* | |
deb49819 | 72 | * Notifications are sent by the touch controller without |
c6d81bd7 HS |
73 | * being requested by the driver and include for example |
74 | * touch indications | |
75 | */ | |
76 | #define NOTIFICATION_TOUCH 0x04 | |
77 | #define NOTIFICATION_BOOTCOMPLETE 0x07 | |
78 | #define NOTIFICATION_OVERRUN 0x25 | |
79 | #define NOTIFICATION_PROXIMITY 0x26 | |
80 | #define NOTIFICATION_INVALID_COMMAND 0xfe | |
81 | ||
82 | #define ZFORCE_REPORT_POINTS 2 | |
83 | #define ZFORCE_MAX_AREA 0xff | |
84 | ||
85 | #define STATE_DOWN 0 | |
86 | #define STATE_MOVE 1 | |
87 | #define STATE_UP 2 | |
88 | ||
89 | #define SETCONFIG_DUALTOUCH (1 << 0) | |
90 | ||
91 | struct zforce_point { | |
92 | int coord_x; | |
93 | int coord_y; | |
94 | int state; | |
95 | int id; | |
96 | int area_major; | |
97 | int area_minor; | |
98 | int orientation; | |
99 | int pressure; | |
100 | int prblty; | |
101 | }; | |
102 | ||
103 | /* | |
104 | * @client the i2c_client | |
105 | * @input the input device | |
106 | * @suspending in the process of going to suspend (don't emit wakeup | |
107 | * events for commands executed to suspend the device) | |
108 | * @suspended device suspended | |
109 | * @access_mutex serialize i2c-access, to keep multipart reads together | |
110 | * @command_done completion to wait for the command result | |
deb49819 LO |
111 | * @command_mutex serialize commands sent to the ic |
112 | * @command_waiting the id of the command that is currently waiting | |
c6d81bd7 HS |
113 | * for a result |
114 | * @command_result returned result of the command | |
115 | */ | |
116 | struct zforce_ts { | |
117 | struct i2c_client *client; | |
118 | struct input_dev *input; | |
119 | const struct zforce_ts_platdata *pdata; | |
120 | char phys[32]; | |
121 | ||
39740370 HS |
122 | struct regulator *reg_vdd; |
123 | ||
c6d81bd7 HS |
124 | bool suspending; |
125 | bool suspended; | |
126 | bool boot_complete; | |
127 | ||
128 | /* Firmware version information */ | |
129 | u16 version_major; | |
130 | u16 version_minor; | |
131 | u16 version_build; | |
132 | u16 version_rev; | |
133 | ||
134 | struct mutex access_mutex; | |
135 | ||
136 | struct completion command_done; | |
137 | struct mutex command_mutex; | |
138 | int command_waiting; | |
139 | int command_result; | |
140 | }; | |
141 | ||
142 | static int zforce_command(struct zforce_ts *ts, u8 cmd) | |
143 | { | |
144 | struct i2c_client *client = ts->client; | |
145 | char buf[3]; | |
146 | int ret; | |
147 | ||
148 | dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); | |
149 | ||
150 | buf[0] = FRAME_START; | |
151 | buf[1] = 1; /* data size, command only */ | |
152 | buf[2] = cmd; | |
153 | ||
154 | mutex_lock(&ts->access_mutex); | |
155 | ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf)); | |
156 | mutex_unlock(&ts->access_mutex); | |
157 | if (ret < 0) { | |
158 | dev_err(&client->dev, "i2c send data request error: %d\n", ret); | |
159 | return ret; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len) | |
166 | { | |
167 | struct i2c_client *client = ts->client; | |
168 | int ret; | |
169 | ||
170 | ret = mutex_trylock(&ts->command_mutex); | |
171 | if (!ret) { | |
172 | dev_err(&client->dev, "already waiting for a command\n"); | |
173 | return -EBUSY; | |
174 | } | |
175 | ||
176 | dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n", | |
177 | buf[1], buf[2]); | |
178 | ||
179 | ts->command_waiting = buf[2]; | |
180 | ||
181 | mutex_lock(&ts->access_mutex); | |
182 | ret = i2c_master_send(client, buf, len); | |
183 | mutex_unlock(&ts->access_mutex); | |
184 | if (ret < 0) { | |
185 | dev_err(&client->dev, "i2c send data request error: %d\n", ret); | |
186 | goto unlock; | |
187 | } | |
188 | ||
189 | dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]); | |
190 | ||
191 | if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) { | |
192 | ret = -ETIME; | |
193 | goto unlock; | |
194 | } | |
195 | ||
196 | ret = ts->command_result; | |
197 | ||
198 | unlock: | |
199 | mutex_unlock(&ts->command_mutex); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | static int zforce_command_wait(struct zforce_ts *ts, u8 cmd) | |
204 | { | |
205 | struct i2c_client *client = ts->client; | |
206 | char buf[3]; | |
207 | int ret; | |
208 | ||
209 | dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); | |
210 | ||
211 | buf[0] = FRAME_START; | |
212 | buf[1] = 1; /* data size, command only */ | |
213 | buf[2] = cmd; | |
214 | ||
215 | ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
216 | if (ret < 0) { | |
217 | dev_err(&client->dev, "i2c send data request error: %d\n", ret); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y) | |
225 | { | |
226 | struct i2c_client *client = ts->client; | |
227 | char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION, | |
228 | (x & 0xff), ((x >> 8) & 0xff), | |
229 | (y & 0xff), ((y >> 8) & 0xff) }; | |
230 | ||
231 | dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y); | |
232 | ||
233 | return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
234 | } | |
235 | ||
236 | static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger, | |
237 | u16 stylus) | |
238 | { | |
239 | struct i2c_client *client = ts->client; | |
240 | char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ, | |
241 | (idle & 0xff), ((idle >> 8) & 0xff), | |
242 | (finger & 0xff), ((finger >> 8) & 0xff), | |
243 | (stylus & 0xff), ((stylus >> 8) & 0xff) }; | |
244 | ||
ad697b96 LO |
245 | dev_dbg(&client->dev, |
246 | "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n", | |
c6d81bd7 HS |
247 | idle, finger, stylus); |
248 | ||
249 | return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
250 | } | |
251 | ||
252 | static int zforce_setconfig(struct zforce_ts *ts, char b1) | |
253 | { | |
254 | struct i2c_client *client = ts->client; | |
255 | char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG, | |
256 | b1, 0, 0, 0 }; | |
257 | ||
258 | dev_dbg(&client->dev, "set config to (%d)\n", b1); | |
259 | ||
260 | return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
261 | } | |
262 | ||
263 | static int zforce_start(struct zforce_ts *ts) | |
264 | { | |
265 | struct i2c_client *client = ts->client; | |
87273364 | 266 | const struct zforce_ts_platdata *pdata = ts->pdata; |
c6d81bd7 HS |
267 | int ret; |
268 | ||
269 | dev_dbg(&client->dev, "starting device\n"); | |
270 | ||
271 | ret = zforce_command_wait(ts, COMMAND_INITIALIZE); | |
272 | if (ret) { | |
273 | dev_err(&client->dev, "Unable to initialize, %d\n", ret); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | ret = zforce_resolution(ts, pdata->x_max, pdata->y_max); | |
278 | if (ret) { | |
279 | dev_err(&client->dev, "Unable to set resolution, %d\n", ret); | |
280 | goto error; | |
281 | } | |
282 | ||
283 | ret = zforce_scan_frequency(ts, 10, 50, 50); | |
284 | if (ret) { | |
285 | dev_err(&client->dev, "Unable to set scan frequency, %d\n", | |
286 | ret); | |
287 | goto error; | |
288 | } | |
289 | ||
3c4396b4 WY |
290 | ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); |
291 | if (ret) { | |
c6d81bd7 HS |
292 | dev_err(&client->dev, "Unable to set config\n"); |
293 | goto error; | |
294 | } | |
295 | ||
296 | /* start sending touch events */ | |
297 | ret = zforce_command(ts, COMMAND_DATAREQUEST); | |
298 | if (ret) { | |
299 | dev_err(&client->dev, "Unable to request data\n"); | |
300 | goto error; | |
301 | } | |
302 | ||
303 | /* | |
304 | * Per NN, initial cal. take max. of 200msec. | |
305 | * Allow time to complete this calibration | |
306 | */ | |
307 | msleep(200); | |
308 | ||
309 | return 0; | |
310 | ||
311 | error: | |
312 | zforce_command_wait(ts, COMMAND_DEACTIVATE); | |
313 | return ret; | |
314 | } | |
315 | ||
316 | static int zforce_stop(struct zforce_ts *ts) | |
317 | { | |
318 | struct i2c_client *client = ts->client; | |
319 | int ret; | |
320 | ||
321 | dev_dbg(&client->dev, "stopping device\n"); | |
322 | ||
323 | /* Deactivates touch sensing and puts the device into sleep. */ | |
324 | ret = zforce_command_wait(ts, COMMAND_DEACTIVATE); | |
325 | if (ret != 0) { | |
326 | dev_err(&client->dev, "could not deactivate device, %d\n", | |
327 | ret); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) | |
335 | { | |
336 | struct i2c_client *client = ts->client; | |
87273364 | 337 | const struct zforce_ts_platdata *pdata = ts->pdata; |
c6d81bd7 HS |
338 | struct zforce_point point; |
339 | int count, i, num = 0; | |
340 | ||
341 | count = payload[0]; | |
342 | if (count > ZFORCE_REPORT_POINTS) { | |
ad697b96 LO |
343 | dev_warn(&client->dev, |
344 | "too many coordinates %d, expected max %d\n", | |
c6d81bd7 HS |
345 | count, ZFORCE_REPORT_POINTS); |
346 | count = ZFORCE_REPORT_POINTS; | |
347 | } | |
348 | ||
349 | for (i = 0; i < count; i++) { | |
350 | point.coord_x = | |
351 | payload[9 * i + 2] << 8 | payload[9 * i + 1]; | |
352 | point.coord_y = | |
353 | payload[9 * i + 4] << 8 | payload[9 * i + 3]; | |
354 | ||
355 | if (point.coord_x > pdata->x_max || | |
356 | point.coord_y > pdata->y_max) { | |
357 | dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", | |
358 | point.coord_x, point.coord_y); | |
359 | point.coord_x = point.coord_y = 0; | |
360 | } | |
361 | ||
362 | point.state = payload[9 * i + 5] & 0x03; | |
363 | point.id = (payload[9 * i + 5] & 0xfc) >> 2; | |
364 | ||
365 | /* determine touch major, minor and orientation */ | |
366 | point.area_major = max(payload[9 * i + 6], | |
367 | payload[9 * i + 7]); | |
368 | point.area_minor = min(payload[9 * i + 6], | |
369 | payload[9 * i + 7]); | |
370 | point.orientation = payload[9 * i + 6] > payload[9 * i + 7]; | |
371 | ||
372 | point.pressure = payload[9 * i + 8]; | |
373 | point.prblty = payload[9 * i + 9]; | |
374 | ||
375 | dev_dbg(&client->dev, | |
376 | "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n", | |
377 | i, count, point.state, point.id, | |
378 | point.pressure, point.prblty, | |
379 | point.coord_x, point.coord_y, | |
380 | point.area_major, point.area_minor, | |
381 | point.orientation); | |
382 | ||
383 | /* the zforce id starts with "1", so needs to be decreased */ | |
384 | input_mt_slot(ts->input, point.id - 1); | |
385 | ||
386 | input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, | |
387 | point.state != STATE_UP); | |
388 | ||
389 | if (point.state != STATE_UP) { | |
390 | input_report_abs(ts->input, ABS_MT_POSITION_X, | |
391 | point.coord_x); | |
392 | input_report_abs(ts->input, ABS_MT_POSITION_Y, | |
393 | point.coord_y); | |
394 | input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, | |
395 | point.area_major); | |
396 | input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, | |
397 | point.area_minor); | |
398 | input_report_abs(ts->input, ABS_MT_ORIENTATION, | |
399 | point.orientation); | |
400 | num++; | |
401 | } | |
402 | } | |
403 | ||
404 | input_mt_sync_frame(ts->input); | |
405 | ||
406 | input_mt_report_finger_count(ts->input, num); | |
407 | ||
408 | input_sync(ts->input); | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | static int zforce_read_packet(struct zforce_ts *ts, u8 *buf) | |
414 | { | |
415 | struct i2c_client *client = ts->client; | |
416 | int ret; | |
417 | ||
418 | mutex_lock(&ts->access_mutex); | |
419 | ||
420 | /* read 2 byte message header */ | |
421 | ret = i2c_master_recv(client, buf, 2); | |
422 | if (ret < 0) { | |
423 | dev_err(&client->dev, "error reading header: %d\n", ret); | |
424 | goto unlock; | |
425 | } | |
426 | ||
427 | if (buf[PAYLOAD_HEADER] != FRAME_START) { | |
428 | dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); | |
429 | ret = -EIO; | |
430 | goto unlock; | |
431 | } | |
432 | ||
5aee41a6 | 433 | if (buf[PAYLOAD_LENGTH] == 0) { |
c6d81bd7 HS |
434 | dev_err(&client->dev, "invalid payload length: %d\n", |
435 | buf[PAYLOAD_LENGTH]); | |
436 | ret = -EIO; | |
437 | goto unlock; | |
438 | } | |
439 | ||
440 | /* read the message */ | |
441 | ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]); | |
442 | if (ret < 0) { | |
443 | dev_err(&client->dev, "error reading payload: %d\n", ret); | |
444 | goto unlock; | |
445 | } | |
446 | ||
447 | dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", | |
448 | buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); | |
449 | ||
450 | unlock: | |
451 | mutex_unlock(&ts->access_mutex); | |
452 | return ret; | |
453 | } | |
454 | ||
455 | static void zforce_complete(struct zforce_ts *ts, int cmd, int result) | |
456 | { | |
457 | struct i2c_client *client = ts->client; | |
458 | ||
459 | if (ts->command_waiting == cmd) { | |
460 | dev_dbg(&client->dev, "completing command 0x%x\n", cmd); | |
461 | ts->command_result = result; | |
462 | complete(&ts->command_done); | |
463 | } else { | |
464 | dev_dbg(&client->dev, "command %d not for us\n", cmd); | |
465 | } | |
466 | } | |
467 | ||
499e6127 HS |
468 | static irqreturn_t zforce_irq(int irq, void *dev_id) |
469 | { | |
470 | struct zforce_ts *ts = dev_id; | |
471 | struct i2c_client *client = ts->client; | |
472 | ||
473 | if (ts->suspended && device_may_wakeup(&client->dev)) | |
474 | pm_wakeup_event(&client->dev, 500); | |
475 | ||
476 | return IRQ_WAKE_THREAD; | |
477 | } | |
478 | ||
479 | static irqreturn_t zforce_irq_thread(int irq, void *dev_id) | |
c6d81bd7 HS |
480 | { |
481 | struct zforce_ts *ts = dev_id; | |
482 | struct i2c_client *client = ts->client; | |
87273364 | 483 | const struct zforce_ts_platdata *pdata = ts->pdata; |
c6d81bd7 | 484 | int ret; |
d333b606 | 485 | u8 payload_buffer[FRAME_MAXSIZE]; |
c6d81bd7 HS |
486 | u8 *payload; |
487 | ||
488 | /* | |
499e6127 | 489 | * When still suspended, return. |
c6d81bd7 HS |
490 | * Due to the level-interrupt we will get re-triggered later. |
491 | */ | |
492 | if (ts->suspended) { | |
c6d81bd7 HS |
493 | msleep(20); |
494 | return IRQ_HANDLED; | |
495 | } | |
496 | ||
497 | dev_dbg(&client->dev, "handling interrupt\n"); | |
498 | ||
499 | /* Don't emit wakeup events from commands run by zforce_suspend */ | |
500 | if (!ts->suspending && device_may_wakeup(&client->dev)) | |
501 | pm_stay_awake(&client->dev); | |
502 | ||
503 | while (!gpio_get_value(pdata->gpio_int)) { | |
504 | ret = zforce_read_packet(ts, payload_buffer); | |
505 | if (ret < 0) { | |
ad697b96 LO |
506 | dev_err(&client->dev, |
507 | "could not read packet, ret: %d\n", ret); | |
c6d81bd7 HS |
508 | break; |
509 | } | |
510 | ||
511 | payload = &payload_buffer[PAYLOAD_BODY]; | |
512 | ||
513 | switch (payload[RESPONSE_ID]) { | |
514 | case NOTIFICATION_TOUCH: | |
515 | /* | |
516 | * Always report touch-events received while | |
517 | * suspending, when being a wakeup source | |
518 | */ | |
519 | if (ts->suspending && device_may_wakeup(&client->dev)) | |
520 | pm_wakeup_event(&client->dev, 500); | |
521 | zforce_touch_event(ts, &payload[RESPONSE_DATA]); | |
522 | break; | |
523 | ||
524 | case NOTIFICATION_BOOTCOMPLETE: | |
525 | ts->boot_complete = payload[RESPONSE_DATA]; | |
526 | zforce_complete(ts, payload[RESPONSE_ID], 0); | |
527 | break; | |
528 | ||
529 | case RESPONSE_INITIALIZE: | |
530 | case RESPONSE_DEACTIVATE: | |
531 | case RESPONSE_SETCONFIG: | |
532 | case RESPONSE_RESOLUTION: | |
533 | case RESPONSE_SCANFREQ: | |
534 | zforce_complete(ts, payload[RESPONSE_ID], | |
535 | payload[RESPONSE_DATA]); | |
536 | break; | |
537 | ||
538 | case RESPONSE_STATUS: | |
539 | /* | |
540 | * Version Payload Results | |
541 | * [2:major] [2:minor] [2:build] [2:rev] | |
542 | */ | |
543 | ts->version_major = (payload[RESPONSE_DATA + 1] << 8) | | |
544 | payload[RESPONSE_DATA]; | |
545 | ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) | | |
546 | payload[RESPONSE_DATA + 2]; | |
547 | ts->version_build = (payload[RESPONSE_DATA + 5] << 8) | | |
548 | payload[RESPONSE_DATA + 4]; | |
549 | ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) | | |
550 | payload[RESPONSE_DATA + 6]; | |
ad697b96 LO |
551 | dev_dbg(&ts->client->dev, |
552 | "Firmware Version %04x:%04x %04x:%04x\n", | |
c6d81bd7 HS |
553 | ts->version_major, ts->version_minor, |
554 | ts->version_build, ts->version_rev); | |
555 | ||
556 | zforce_complete(ts, payload[RESPONSE_ID], 0); | |
557 | break; | |
558 | ||
559 | case NOTIFICATION_INVALID_COMMAND: | |
560 | dev_err(&ts->client->dev, "invalid command: 0x%x\n", | |
561 | payload[RESPONSE_DATA]); | |
562 | break; | |
563 | ||
564 | default: | |
ad697b96 LO |
565 | dev_err(&ts->client->dev, |
566 | "unrecognized response id: 0x%x\n", | |
c6d81bd7 HS |
567 | payload[RESPONSE_ID]); |
568 | break; | |
569 | } | |
570 | } | |
571 | ||
572 | if (!ts->suspending && device_may_wakeup(&client->dev)) | |
573 | pm_relax(&client->dev); | |
574 | ||
575 | dev_dbg(&client->dev, "finished interrupt\n"); | |
576 | ||
577 | return IRQ_HANDLED; | |
578 | } | |
579 | ||
580 | static int zforce_input_open(struct input_dev *dev) | |
581 | { | |
582 | struct zforce_ts *ts = input_get_drvdata(dev); | |
583 | int ret; | |
584 | ||
585 | ret = zforce_start(ts); | |
586 | if (ret) | |
587 | return ret; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static void zforce_input_close(struct input_dev *dev) | |
593 | { | |
594 | struct zforce_ts *ts = input_get_drvdata(dev); | |
595 | struct i2c_client *client = ts->client; | |
596 | int ret; | |
597 | ||
598 | ret = zforce_stop(ts); | |
599 | if (ret) | |
600 | dev_warn(&client->dev, "stopping zforce failed\n"); | |
601 | ||
602 | return; | |
603 | } | |
604 | ||
02b6a58b | 605 | static int __maybe_unused zforce_suspend(struct device *dev) |
c6d81bd7 HS |
606 | { |
607 | struct i2c_client *client = to_i2c_client(dev); | |
608 | struct zforce_ts *ts = i2c_get_clientdata(client); | |
609 | struct input_dev *input = ts->input; | |
610 | int ret = 0; | |
611 | ||
612 | mutex_lock(&input->mutex); | |
613 | ts->suspending = true; | |
614 | ||
615 | /* | |
616 | * When configured as a wakeup source device should always wake | |
617 | * the system, therefore start device if necessary. | |
618 | */ | |
619 | if (device_may_wakeup(&client->dev)) { | |
620 | dev_dbg(&client->dev, "suspend while being a wakeup source\n"); | |
621 | ||
622 | /* Need to start device, if not open, to be a wakeup source. */ | |
623 | if (!input->users) { | |
624 | ret = zforce_start(ts); | |
625 | if (ret) | |
626 | goto unlock; | |
627 | } | |
628 | ||
629 | enable_irq_wake(client->irq); | |
630 | } else if (input->users) { | |
ad697b96 LO |
631 | dev_dbg(&client->dev, |
632 | "suspend without being a wakeup source\n"); | |
c6d81bd7 HS |
633 | |
634 | ret = zforce_stop(ts); | |
635 | if (ret) | |
636 | goto unlock; | |
637 | ||
638 | disable_irq(client->irq); | |
639 | } | |
640 | ||
641 | ts->suspended = true; | |
642 | ||
643 | unlock: | |
644 | ts->suspending = false; | |
645 | mutex_unlock(&input->mutex); | |
646 | ||
647 | return ret; | |
648 | } | |
649 | ||
02b6a58b | 650 | static int __maybe_unused zforce_resume(struct device *dev) |
c6d81bd7 HS |
651 | { |
652 | struct i2c_client *client = to_i2c_client(dev); | |
653 | struct zforce_ts *ts = i2c_get_clientdata(client); | |
654 | struct input_dev *input = ts->input; | |
655 | int ret = 0; | |
656 | ||
657 | mutex_lock(&input->mutex); | |
658 | ||
659 | ts->suspended = false; | |
660 | ||
661 | if (device_may_wakeup(&client->dev)) { | |
662 | dev_dbg(&client->dev, "resume from being a wakeup source\n"); | |
663 | ||
664 | disable_irq_wake(client->irq); | |
665 | ||
666 | /* need to stop device if it was not open on suspend */ | |
667 | if (!input->users) { | |
668 | ret = zforce_stop(ts); | |
669 | if (ret) | |
670 | goto unlock; | |
671 | } | |
672 | } else if (input->users) { | |
673 | dev_dbg(&client->dev, "resume without being a wakeup source\n"); | |
674 | ||
675 | enable_irq(client->irq); | |
676 | ||
677 | ret = zforce_start(ts); | |
678 | if (ret < 0) | |
679 | goto unlock; | |
680 | } | |
681 | ||
682 | unlock: | |
683 | mutex_unlock(&input->mutex); | |
684 | ||
685 | return ret; | |
686 | } | |
c6d81bd7 HS |
687 | |
688 | static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); | |
689 | ||
690 | static void zforce_reset(void *data) | |
691 | { | |
692 | struct zforce_ts *ts = data; | |
693 | ||
694 | gpio_set_value(ts->pdata->gpio_rst, 0); | |
39740370 HS |
695 | |
696 | udelay(10); | |
697 | ||
698 | if (!IS_ERR(ts->reg_vdd)) | |
699 | regulator_disable(ts->reg_vdd); | |
c6d81bd7 HS |
700 | } |
701 | ||
6f2e6c9b HS |
702 | static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev) |
703 | { | |
704 | struct zforce_ts_platdata *pdata; | |
705 | struct device_node *np = dev->of_node; | |
706 | ||
707 | if (!np) | |
708 | return ERR_PTR(-ENOENT); | |
709 | ||
710 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
711 | if (!pdata) { | |
712 | dev_err(dev, "failed to allocate platform data\n"); | |
713 | return ERR_PTR(-ENOMEM); | |
714 | } | |
715 | ||
716 | pdata->gpio_int = of_get_gpio(np, 0); | |
717 | if (!gpio_is_valid(pdata->gpio_int)) { | |
718 | dev_err(dev, "failed to get interrupt gpio\n"); | |
719 | return ERR_PTR(-EINVAL); | |
720 | } | |
721 | ||
722 | pdata->gpio_rst = of_get_gpio(np, 1); | |
723 | if (!gpio_is_valid(pdata->gpio_rst)) { | |
724 | dev_err(dev, "failed to get reset gpio\n"); | |
725 | return ERR_PTR(-EINVAL); | |
726 | } | |
727 | ||
728 | if (of_property_read_u32(np, "x-size", &pdata->x_max)) { | |
729 | dev_err(dev, "failed to get x-size property\n"); | |
730 | return ERR_PTR(-EINVAL); | |
731 | } | |
732 | ||
733 | if (of_property_read_u32(np, "y-size", &pdata->y_max)) { | |
734 | dev_err(dev, "failed to get y-size property\n"); | |
735 | return ERR_PTR(-EINVAL); | |
736 | } | |
737 | ||
738 | return pdata; | |
739 | } | |
740 | ||
c6d81bd7 HS |
741 | static int zforce_probe(struct i2c_client *client, |
742 | const struct i2c_device_id *id) | |
743 | { | |
744 | const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); | |
745 | struct zforce_ts *ts; | |
746 | struct input_dev *input_dev; | |
747 | int ret; | |
748 | ||
6f2e6c9b HS |
749 | if (!pdata) { |
750 | pdata = zforce_parse_dt(&client->dev); | |
751 | if (IS_ERR(pdata)) | |
752 | return PTR_ERR(pdata); | |
753 | } | |
c6d81bd7 HS |
754 | |
755 | ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL); | |
756 | if (!ts) | |
757 | return -ENOMEM; | |
758 | ||
759 | ret = devm_gpio_request_one(&client->dev, pdata->gpio_int, GPIOF_IN, | |
760 | "zforce_ts_int"); | |
761 | if (ret) { | |
762 | dev_err(&client->dev, "request of gpio %d failed, %d\n", | |
763 | pdata->gpio_int, ret); | |
764 | return ret; | |
765 | } | |
766 | ||
767 | ret = devm_gpio_request_one(&client->dev, pdata->gpio_rst, | |
768 | GPIOF_OUT_INIT_LOW, "zforce_ts_rst"); | |
769 | if (ret) { | |
770 | dev_err(&client->dev, "request of gpio %d failed, %d\n", | |
771 | pdata->gpio_rst, ret); | |
772 | return ret; | |
773 | } | |
774 | ||
39740370 HS |
775 | ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd"); |
776 | if (IS_ERR(ts->reg_vdd)) { | |
777 | ret = PTR_ERR(ts->reg_vdd); | |
778 | if (ret == -EPROBE_DEFER) | |
779 | return ret; | |
780 | } else { | |
781 | ret = regulator_enable(ts->reg_vdd); | |
782 | if (ret) | |
783 | return ret; | |
784 | ||
785 | /* | |
786 | * according to datasheet add 100us grace time after regular | |
787 | * regulator enable delay. | |
788 | */ | |
789 | udelay(100); | |
790 | } | |
791 | ||
c6d81bd7 HS |
792 | ret = devm_add_action(&client->dev, zforce_reset, ts); |
793 | if (ret) { | |
794 | dev_err(&client->dev, "failed to register reset action, %d\n", | |
795 | ret); | |
39740370 HS |
796 | |
797 | /* hereafter the regulator will be disabled by the action */ | |
798 | if (!IS_ERR(ts->reg_vdd)) | |
799 | regulator_disable(ts->reg_vdd); | |
800 | ||
c6d81bd7 HS |
801 | return ret; |
802 | } | |
803 | ||
804 | snprintf(ts->phys, sizeof(ts->phys), | |
805 | "%s/input0", dev_name(&client->dev)); | |
806 | ||
807 | input_dev = devm_input_allocate_device(&client->dev); | |
808 | if (!input_dev) { | |
809 | dev_err(&client->dev, "could not allocate input device\n"); | |
810 | return -ENOMEM; | |
811 | } | |
812 | ||
813 | mutex_init(&ts->access_mutex); | |
814 | mutex_init(&ts->command_mutex); | |
815 | ||
816 | ts->pdata = pdata; | |
817 | ts->client = client; | |
818 | ts->input = input_dev; | |
819 | ||
820 | input_dev->name = "Neonode zForce touchscreen"; | |
821 | input_dev->phys = ts->phys; | |
822 | input_dev->id.bustype = BUS_I2C; | |
823 | ||
824 | input_dev->open = zforce_input_open; | |
825 | input_dev->close = zforce_input_close; | |
826 | ||
827 | __set_bit(EV_KEY, input_dev->evbit); | |
828 | __set_bit(EV_SYN, input_dev->evbit); | |
829 | __set_bit(EV_ABS, input_dev->evbit); | |
830 | ||
831 | /* For multi touch */ | |
832 | input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, | |
833 | pdata->x_max, 0, 0); | |
834 | input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, | |
835 | pdata->y_max, 0, 0); | |
836 | ||
837 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, | |
838 | ZFORCE_MAX_AREA, 0, 0); | |
839 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, | |
840 | ZFORCE_MAX_AREA, 0, 0); | |
841 | input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); | |
842 | input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT); | |
843 | ||
844 | input_set_drvdata(ts->input, ts); | |
845 | ||
846 | init_completion(&ts->command_done); | |
847 | ||
848 | /* | |
849 | * The zforce pulls the interrupt low when it has data ready. | |
850 | * After it is triggered the isr thread runs until all the available | |
851 | * packets have been read and the interrupt is high again. | |
852 | * Therefore we can trigger the interrupt anytime it is low and do | |
853 | * not need to limit it to the interrupt edge. | |
854 | */ | |
499e6127 HS |
855 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
856 | zforce_irq, zforce_irq_thread, | |
c6d81bd7 HS |
857 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
858 | input_dev->name, ts); | |
859 | if (ret) { | |
860 | dev_err(&client->dev, "irq %d request failed\n", client->irq); | |
861 | return ret; | |
862 | } | |
863 | ||
864 | i2c_set_clientdata(client, ts); | |
865 | ||
866 | /* let the controller boot */ | |
867 | gpio_set_value(pdata->gpio_rst, 1); | |
868 | ||
869 | ts->command_waiting = NOTIFICATION_BOOTCOMPLETE; | |
870 | if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) | |
871 | dev_warn(&client->dev, "bootcomplete timed out\n"); | |
872 | ||
873 | /* need to start device to get version information */ | |
874 | ret = zforce_command_wait(ts, COMMAND_INITIALIZE); | |
875 | if (ret) { | |
876 | dev_err(&client->dev, "unable to initialize, %d\n", ret); | |
877 | return ret; | |
878 | } | |
879 | ||
deb49819 | 880 | /* this gets the firmware version among other information */ |
c6d81bd7 HS |
881 | ret = zforce_command_wait(ts, COMMAND_STATUS); |
882 | if (ret < 0) { | |
883 | dev_err(&client->dev, "couldn't get status, %d\n", ret); | |
884 | zforce_stop(ts); | |
885 | return ret; | |
886 | } | |
887 | ||
888 | /* stop device and put it into sleep until it is opened */ | |
889 | ret = zforce_stop(ts); | |
890 | if (ret < 0) | |
891 | return ret; | |
892 | ||
893 | device_set_wakeup_capable(&client->dev, true); | |
894 | ||
895 | ret = input_register_device(input_dev); | |
896 | if (ret) { | |
897 | dev_err(&client->dev, "could not register input device, %d\n", | |
898 | ret); | |
899 | return ret; | |
900 | } | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
905 | static struct i2c_device_id zforce_idtable[] = { | |
906 | { "zforce-ts", 0 }, | |
907 | { } | |
908 | }; | |
909 | MODULE_DEVICE_TABLE(i2c, zforce_idtable); | |
910 | ||
6f2e6c9b | 911 | #ifdef CONFIG_OF |
f3f63193 | 912 | static const struct of_device_id zforce_dt_idtable[] = { |
6f2e6c9b HS |
913 | { .compatible = "neonode,zforce" }, |
914 | {}, | |
915 | }; | |
916 | MODULE_DEVICE_TABLE(of, zforce_dt_idtable); | |
917 | #endif | |
918 | ||
c6d81bd7 HS |
919 | static struct i2c_driver zforce_driver = { |
920 | .driver = { | |
921 | .owner = THIS_MODULE, | |
922 | .name = "zforce-ts", | |
923 | .pm = &zforce_pm_ops, | |
6f2e6c9b | 924 | .of_match_table = of_match_ptr(zforce_dt_idtable), |
c6d81bd7 HS |
925 | }, |
926 | .probe = zforce_probe, | |
927 | .id_table = zforce_idtable, | |
928 | }; | |
929 | ||
930 | module_i2c_driver(zforce_driver); | |
931 | ||
932 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
933 | MODULE_DESCRIPTION("zForce TouchScreen Driver"); | |
934 | MODULE_LICENSE("GPL"); |