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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c6d81bd7 HS |
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> | |
c6d81bd7 HS |
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> | |
2d538095 | 19 | #include <linux/gpio/consumer.h> |
c6d81bd7 HS |
20 | #include <linux/device.h> |
21 | #include <linux/sysfs.h> | |
22 | #include <linux/input/mt.h> | |
23 | #include <linux/platform_data/zforce_ts.h> | |
39740370 | 24 | #include <linux/regulator/consumer.h> |
6f2e6c9b | 25 | #include <linux/of.h> |
c6d81bd7 HS |
26 | |
27 | #define WAIT_TIMEOUT msecs_to_jiffies(1000) | |
28 | ||
29 | #define FRAME_START 0xee | |
d333b606 | 30 | #define FRAME_MAXSIZE 257 |
c6d81bd7 HS |
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 | /* | |
deb49819 | 62 | * Notifications are sent by the touch controller without |
c6d81bd7 HS |
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 | |
deb49819 LO |
101 | * @command_mutex serialize commands sent to the ic |
102 | * @command_waiting the id of the command that is currently waiting | |
c6d81bd7 HS |
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 | ||
39740370 HS |
112 | struct regulator *reg_vdd; |
113 | ||
2d538095 DB |
114 | struct gpio_desc *gpio_int; |
115 | struct gpio_desc *gpio_rst; | |
116 | ||
c6d81bd7 HS |
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 | ||
2d538095 DB |
158 | static void zforce_reset_assert(struct zforce_ts *ts) |
159 | { | |
160 | gpiod_set_value_cansleep(ts->gpio_rst, 1); | |
161 | } | |
162 | ||
163 | static void zforce_reset_deassert(struct zforce_ts *ts) | |
164 | { | |
165 | gpiod_set_value_cansleep(ts->gpio_rst, 0); | |
166 | } | |
167 | ||
c6d81bd7 HS |
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 | ||
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 | ||
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 | ||
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 | ||
ad697b96 LO |
248 | dev_dbg(&client->dev, |
249 | "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n", | |
c6d81bd7 HS |
250 | idle, finger, stylus); |
251 | ||
252 | return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
253 | } | |
254 | ||
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 | ||
266 | static int zforce_start(struct zforce_ts *ts) | |
267 | { | |
268 | struct i2c_client *client = ts->client; | |
87273364 | 269 | const struct zforce_ts_platdata *pdata = ts->pdata; |
c6d81bd7 HS |
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 | ||
3c4396b4 WY |
293 | ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); |
294 | if (ret) { | |
c6d81bd7 HS |
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 | ||
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 | ||
337 | static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) | |
338 | { | |
339 | struct i2c_client *client = ts->client; | |
87273364 | 340 | const struct zforce_ts_platdata *pdata = ts->pdata; |
c6d81bd7 HS |
341 | struct zforce_point point; |
342 | int count, i, num = 0; | |
343 | ||
344 | count = payload[0]; | |
345 | if (count > ZFORCE_REPORT_POINTS) { | |
ad697b96 LO |
346 | dev_warn(&client->dev, |
347 | "too many coordinates %d, expected max %d\n", | |
c6d81bd7 HS |
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 | ||
6984ab1a KW |
365 | point.state = payload[9 * i + 5] & 0x0f; |
366 | point.id = (payload[9 * i + 5] & 0xf0) >> 4; | |
c6d81bd7 HS |
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 | ||
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 | ||
5aee41a6 | 436 | if (buf[PAYLOAD_LENGTH] == 0) { |
c6d81bd7 HS |
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 | ||
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 | ||
499e6127 HS |
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 | ||
482 | static irqreturn_t zforce_irq_thread(int irq, void *dev_id) | |
c6d81bd7 HS |
483 | { |
484 | struct zforce_ts *ts = dev_id; | |
485 | struct i2c_client *client = ts->client; | |
c6d81bd7 | 486 | int ret; |
d333b606 | 487 | u8 payload_buffer[FRAME_MAXSIZE]; |
c6d81bd7 HS |
488 | u8 *payload; |
489 | ||
490 | /* | |
499e6127 | 491 | * When still suspended, return. |
c6d81bd7 HS |
492 | * Due to the level-interrupt we will get re-triggered later. |
493 | */ | |
494 | if (ts->suspended) { | |
c6d81bd7 HS |
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 | ||
62f46669 DB |
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 { | |
c6d81bd7 HS |
515 | ret = zforce_read_packet(ts, payload_buffer); |
516 | if (ret < 0) { | |
ad697b96 LO |
517 | dev_err(&client->dev, |
518 | "could not read packet, ret: %d\n", ret); | |
c6d81bd7 HS |
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]; | |
ad697b96 LO |
562 | dev_dbg(&ts->client->dev, |
563 | "Firmware Version %04x:%04x %04x:%04x\n", | |
c6d81bd7 HS |
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: | |
ad697b96 LO |
576 | dev_err(&ts->client->dev, |
577 | "unrecognized response id: 0x%x\n", | |
c6d81bd7 HS |
578 | payload[RESPONSE_ID]); |
579 | break; | |
580 | } | |
62f46669 | 581 | } while (gpiod_get_value_cansleep(ts->gpio_int)); |
c6d81bd7 HS |
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 | ||
591 | static int zforce_input_open(struct input_dev *dev) | |
592 | { | |
593 | struct zforce_ts *ts = input_get_drvdata(dev); | |
c6d81bd7 | 594 | |
a47fcbc2 | 595 | return zforce_start(ts); |
c6d81bd7 HS |
596 | } |
597 | ||
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 | ||
02b6a58b | 611 | static int __maybe_unused zforce_suspend(struct device *dev) |
c6d81bd7 HS |
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->users) { | |
630 | ret = zforce_start(ts); | |
631 | if (ret) | |
632 | goto unlock; | |
633 | } | |
634 | ||
635 | enable_irq_wake(client->irq); | |
636 | } else if (input->users) { | |
ad697b96 LO |
637 | dev_dbg(&client->dev, |
638 | "suspend without being a wakeup source\n"); | |
c6d81bd7 HS |
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 | ||
02b6a58b | 656 | static int __maybe_unused zforce_resume(struct device *dev) |
c6d81bd7 HS |
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->users) { | |
674 | ret = zforce_stop(ts); | |
675 | if (ret) | |
676 | goto unlock; | |
677 | } | |
678 | } else if (input->users) { | |
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 | } | |
c6d81bd7 HS |
693 | |
694 | static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); | |
695 | ||
696 | static void zforce_reset(void *data) | |
697 | { | |
698 | struct zforce_ts *ts = data; | |
699 | ||
2d538095 | 700 | zforce_reset_assert(ts); |
39740370 HS |
701 | |
702 | udelay(10); | |
703 | ||
704 | if (!IS_ERR(ts->reg_vdd)) | |
705 | regulator_disable(ts->reg_vdd); | |
c6d81bd7 HS |
706 | } |
707 | ||
6f2e6c9b HS |
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 | ||
6f2e6c9b HS |
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 | ||
c6d81bd7 HS |
735 | static int zforce_probe(struct i2c_client *client, |
736 | const struct i2c_device_id *id) | |
737 | { | |
738 | const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); | |
739 | struct zforce_ts *ts; | |
740 | struct input_dev *input_dev; | |
741 | int ret; | |
742 | ||
6f2e6c9b HS |
743 | if (!pdata) { |
744 | pdata = zforce_parse_dt(&client->dev); | |
745 | if (IS_ERR(pdata)) | |
746 | return PTR_ERR(pdata); | |
747 | } | |
c6d81bd7 HS |
748 | |
749 | ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL); | |
750 | if (!ts) | |
751 | return -ENOMEM; | |
752 | ||
62f46669 DB |
753 | ts->gpio_rst = devm_gpiod_get_optional(&client->dev, "reset", |
754 | GPIOD_OUT_HIGH); | |
2d538095 DB |
755 | if (IS_ERR(ts->gpio_rst)) { |
756 | ret = PTR_ERR(ts->gpio_rst); | |
757 | dev_err(&client->dev, | |
758 | "failed to request reset GPIO: %d\n", ret); | |
c6d81bd7 HS |
759 | return ret; |
760 | } | |
761 | ||
62f46669 DB |
762 | if (ts->gpio_rst) { |
763 | ts->gpio_int = devm_gpiod_get_optional(&client->dev, "irq", | |
764 | GPIOD_IN); | |
765 | if (IS_ERR(ts->gpio_int)) { | |
766 | ret = PTR_ERR(ts->gpio_int); | |
767 | dev_err(&client->dev, | |
768 | "failed to request interrupt GPIO: %d\n", ret); | |
769 | return ret; | |
770 | } | |
771 | } else { | |
772 | /* | |
773 | * Deprecated GPIO handling for compatibility | |
774 | * with legacy binding. | |
775 | */ | |
776 | ||
777 | /* INT GPIO */ | |
778 | ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, | |
779 | GPIOD_IN); | |
780 | if (IS_ERR(ts->gpio_int)) { | |
781 | ret = PTR_ERR(ts->gpio_int); | |
782 | dev_err(&client->dev, | |
783 | "failed to request interrupt GPIO: %d\n", ret); | |
784 | return ret; | |
785 | } | |
786 | ||
787 | /* RST GPIO */ | |
788 | ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1, | |
789 | GPIOD_OUT_HIGH); | |
790 | if (IS_ERR(ts->gpio_rst)) { | |
791 | ret = PTR_ERR(ts->gpio_rst); | |
792 | dev_err(&client->dev, | |
793 | "failed to request reset GPIO: %d\n", ret); | |
794 | return ret; | |
795 | } | |
796 | } | |
797 | ||
39740370 HS |
798 | ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd"); |
799 | if (IS_ERR(ts->reg_vdd)) { | |
800 | ret = PTR_ERR(ts->reg_vdd); | |
801 | if (ret == -EPROBE_DEFER) | |
802 | return ret; | |
803 | } else { | |
804 | ret = regulator_enable(ts->reg_vdd); | |
805 | if (ret) | |
806 | return ret; | |
807 | ||
808 | /* | |
809 | * according to datasheet add 100us grace time after regular | |
810 | * regulator enable delay. | |
811 | */ | |
812 | udelay(100); | |
813 | } | |
814 | ||
c6d81bd7 HS |
815 | ret = devm_add_action(&client->dev, zforce_reset, ts); |
816 | if (ret) { | |
817 | dev_err(&client->dev, "failed to register reset action, %d\n", | |
818 | ret); | |
39740370 HS |
819 | |
820 | /* hereafter the regulator will be disabled by the action */ | |
821 | if (!IS_ERR(ts->reg_vdd)) | |
822 | regulator_disable(ts->reg_vdd); | |
823 | ||
c6d81bd7 HS |
824 | return ret; |
825 | } | |
826 | ||
827 | snprintf(ts->phys, sizeof(ts->phys), | |
828 | "%s/input0", dev_name(&client->dev)); | |
829 | ||
830 | input_dev = devm_input_allocate_device(&client->dev); | |
831 | if (!input_dev) { | |
832 | dev_err(&client->dev, "could not allocate input device\n"); | |
833 | return -ENOMEM; | |
834 | } | |
835 | ||
836 | mutex_init(&ts->access_mutex); | |
837 | mutex_init(&ts->command_mutex); | |
838 | ||
839 | ts->pdata = pdata; | |
840 | ts->client = client; | |
841 | ts->input = input_dev; | |
842 | ||
843 | input_dev->name = "Neonode zForce touchscreen"; | |
844 | input_dev->phys = ts->phys; | |
845 | input_dev->id.bustype = BUS_I2C; | |
846 | ||
847 | input_dev->open = zforce_input_open; | |
848 | input_dev->close = zforce_input_close; | |
849 | ||
850 | __set_bit(EV_KEY, input_dev->evbit); | |
851 | __set_bit(EV_SYN, input_dev->evbit); | |
852 | __set_bit(EV_ABS, input_dev->evbit); | |
853 | ||
854 | /* For multi touch */ | |
855 | input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, | |
856 | pdata->x_max, 0, 0); | |
857 | input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, | |
858 | pdata->y_max, 0, 0); | |
859 | ||
860 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, | |
861 | ZFORCE_MAX_AREA, 0, 0); | |
862 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, | |
863 | ZFORCE_MAX_AREA, 0, 0); | |
864 | input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); | |
865 | input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT); | |
866 | ||
867 | input_set_drvdata(ts->input, ts); | |
868 | ||
869 | init_completion(&ts->command_done); | |
870 | ||
871 | /* | |
872 | * The zforce pulls the interrupt low when it has data ready. | |
873 | * After it is triggered the isr thread runs until all the available | |
874 | * packets have been read and the interrupt is high again. | |
875 | * Therefore we can trigger the interrupt anytime it is low and do | |
876 | * not need to limit it to the interrupt edge. | |
877 | */ | |
499e6127 HS |
878 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
879 | zforce_irq, zforce_irq_thread, | |
c6d81bd7 HS |
880 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
881 | input_dev->name, ts); | |
882 | if (ret) { | |
883 | dev_err(&client->dev, "irq %d request failed\n", client->irq); | |
884 | return ret; | |
885 | } | |
886 | ||
887 | i2c_set_clientdata(client, ts); | |
888 | ||
889 | /* let the controller boot */ | |
2d538095 | 890 | zforce_reset_deassert(ts); |
c6d81bd7 HS |
891 | |
892 | ts->command_waiting = NOTIFICATION_BOOTCOMPLETE; | |
893 | if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) | |
894 | dev_warn(&client->dev, "bootcomplete timed out\n"); | |
895 | ||
896 | /* need to start device to get version information */ | |
897 | ret = zforce_command_wait(ts, COMMAND_INITIALIZE); | |
898 | if (ret) { | |
899 | dev_err(&client->dev, "unable to initialize, %d\n", ret); | |
900 | return ret; | |
901 | } | |
902 | ||
deb49819 | 903 | /* this gets the firmware version among other information */ |
c6d81bd7 HS |
904 | ret = zforce_command_wait(ts, COMMAND_STATUS); |
905 | if (ret < 0) { | |
906 | dev_err(&client->dev, "couldn't get status, %d\n", ret); | |
907 | zforce_stop(ts); | |
908 | return ret; | |
909 | } | |
910 | ||
911 | /* stop device and put it into sleep until it is opened */ | |
912 | ret = zforce_stop(ts); | |
913 | if (ret < 0) | |
914 | return ret; | |
915 | ||
916 | device_set_wakeup_capable(&client->dev, true); | |
917 | ||
918 | ret = input_register_device(input_dev); | |
919 | if (ret) { | |
920 | dev_err(&client->dev, "could not register input device, %d\n", | |
921 | ret); | |
922 | return ret; | |
923 | } | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | static struct i2c_device_id zforce_idtable[] = { | |
929 | { "zforce-ts", 0 }, | |
930 | { } | |
931 | }; | |
932 | MODULE_DEVICE_TABLE(i2c, zforce_idtable); | |
933 | ||
6f2e6c9b | 934 | #ifdef CONFIG_OF |
f3f63193 | 935 | static const struct of_device_id zforce_dt_idtable[] = { |
6f2e6c9b HS |
936 | { .compatible = "neonode,zforce" }, |
937 | {}, | |
938 | }; | |
939 | MODULE_DEVICE_TABLE(of, zforce_dt_idtable); | |
940 | #endif | |
941 | ||
c6d81bd7 HS |
942 | static struct i2c_driver zforce_driver = { |
943 | .driver = { | |
c6d81bd7 HS |
944 | .name = "zforce-ts", |
945 | .pm = &zforce_pm_ops, | |
6f2e6c9b | 946 | .of_match_table = of_match_ptr(zforce_dt_idtable), |
c6d81bd7 HS |
947 | }, |
948 | .probe = zforce_probe, | |
949 | .id_table = zforce_idtable, | |
950 | }; | |
951 | ||
952 | module_i2c_driver(zforce_driver); | |
953 | ||
954 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
955 | MODULE_DESCRIPTION("zForce TouchScreen Driver"); | |
956 | MODULE_LICENSE("GPL"); |