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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> | |
2d538095 | 27 | #include <linux/gpio/consumer.h> |
c6d81bd7 HS |
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 | 32 | #include <linux/regulator/consumer.h> |
6f2e6c9b | 33 | #include <linux/of.h> |
c6d81bd7 HS |
34 | |
35 | #define WAIT_TIMEOUT msecs_to_jiffies(1000) | |
36 | ||
37 | #define FRAME_START 0xee | |
d333b606 | 38 | #define FRAME_MAXSIZE 257 |
c6d81bd7 HS |
39 | |
40 | /* Offsets of the different parts of the payload the controller sends */ | |
41 | #define PAYLOAD_HEADER 0 | |
42 | #define PAYLOAD_LENGTH 1 | |
43 | #define PAYLOAD_BODY 2 | |
44 | ||
45 | /* Response offsets */ | |
46 | #define RESPONSE_ID 0 | |
47 | #define RESPONSE_DATA 1 | |
48 | ||
49 | /* Commands */ | |
50 | #define COMMAND_DEACTIVATE 0x00 | |
51 | #define COMMAND_INITIALIZE 0x01 | |
52 | #define COMMAND_RESOLUTION 0x02 | |
53 | #define COMMAND_SETCONFIG 0x03 | |
54 | #define COMMAND_DATAREQUEST 0x04 | |
55 | #define COMMAND_SCANFREQ 0x08 | |
56 | #define COMMAND_STATUS 0X1e | |
57 | ||
58 | /* | |
59 | * Responses the controller sends as a result of | |
60 | * command requests | |
61 | */ | |
62 | #define RESPONSE_DEACTIVATE 0x00 | |
63 | #define RESPONSE_INITIALIZE 0x01 | |
64 | #define RESPONSE_RESOLUTION 0x02 | |
65 | #define RESPONSE_SETCONFIG 0x03 | |
66 | #define RESPONSE_SCANFREQ 0x08 | |
67 | #define RESPONSE_STATUS 0X1e | |
68 | ||
69 | /* | |
deb49819 | 70 | * Notifications are sent by the touch controller without |
c6d81bd7 HS |
71 | * being requested by the driver and include for example |
72 | * touch indications | |
73 | */ | |
74 | #define NOTIFICATION_TOUCH 0x04 | |
75 | #define NOTIFICATION_BOOTCOMPLETE 0x07 | |
76 | #define NOTIFICATION_OVERRUN 0x25 | |
77 | #define NOTIFICATION_PROXIMITY 0x26 | |
78 | #define NOTIFICATION_INVALID_COMMAND 0xfe | |
79 | ||
80 | #define ZFORCE_REPORT_POINTS 2 | |
81 | #define ZFORCE_MAX_AREA 0xff | |
82 | ||
83 | #define STATE_DOWN 0 | |
84 | #define STATE_MOVE 1 | |
85 | #define STATE_UP 2 | |
86 | ||
87 | #define SETCONFIG_DUALTOUCH (1 << 0) | |
88 | ||
89 | struct zforce_point { | |
90 | int coord_x; | |
91 | int coord_y; | |
92 | int state; | |
93 | int id; | |
94 | int area_major; | |
95 | int area_minor; | |
96 | int orientation; | |
97 | int pressure; | |
98 | int prblty; | |
99 | }; | |
100 | ||
101 | /* | |
102 | * @client the i2c_client | |
103 | * @input the input device | |
104 | * @suspending in the process of going to suspend (don't emit wakeup | |
105 | * events for commands executed to suspend the device) | |
106 | * @suspended device suspended | |
107 | * @access_mutex serialize i2c-access, to keep multipart reads together | |
108 | * @command_done completion to wait for the command result | |
deb49819 LO |
109 | * @command_mutex serialize commands sent to the ic |
110 | * @command_waiting the id of the command that is currently waiting | |
c6d81bd7 HS |
111 | * for a result |
112 | * @command_result returned result of the command | |
113 | */ | |
114 | struct zforce_ts { | |
115 | struct i2c_client *client; | |
116 | struct input_dev *input; | |
117 | const struct zforce_ts_platdata *pdata; | |
118 | char phys[32]; | |
119 | ||
39740370 HS |
120 | struct regulator *reg_vdd; |
121 | ||
2d538095 DB |
122 | struct gpio_desc *gpio_int; |
123 | struct gpio_desc *gpio_rst; | |
124 | ||
c6d81bd7 HS |
125 | bool suspending; |
126 | bool suspended; | |
127 | bool boot_complete; | |
128 | ||
129 | /* Firmware version information */ | |
130 | u16 version_major; | |
131 | u16 version_minor; | |
132 | u16 version_build; | |
133 | u16 version_rev; | |
134 | ||
135 | struct mutex access_mutex; | |
136 | ||
137 | struct completion command_done; | |
138 | struct mutex command_mutex; | |
139 | int command_waiting; | |
140 | int command_result; | |
141 | }; | |
142 | ||
143 | static int zforce_command(struct zforce_ts *ts, u8 cmd) | |
144 | { | |
145 | struct i2c_client *client = ts->client; | |
146 | char buf[3]; | |
147 | int ret; | |
148 | ||
149 | dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); | |
150 | ||
151 | buf[0] = FRAME_START; | |
152 | buf[1] = 1; /* data size, command only */ | |
153 | buf[2] = cmd; | |
154 | ||
155 | mutex_lock(&ts->access_mutex); | |
156 | ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf)); | |
157 | mutex_unlock(&ts->access_mutex); | |
158 | if (ret < 0) { | |
159 | dev_err(&client->dev, "i2c send data request error: %d\n", ret); | |
160 | return ret; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
2d538095 DB |
166 | static void zforce_reset_assert(struct zforce_ts *ts) |
167 | { | |
168 | gpiod_set_value_cansleep(ts->gpio_rst, 1); | |
169 | } | |
170 | ||
171 | static void zforce_reset_deassert(struct zforce_ts *ts) | |
172 | { | |
173 | gpiod_set_value_cansleep(ts->gpio_rst, 0); | |
174 | } | |
175 | ||
c6d81bd7 HS |
176 | static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len) |
177 | { | |
178 | struct i2c_client *client = ts->client; | |
179 | int ret; | |
180 | ||
181 | ret = mutex_trylock(&ts->command_mutex); | |
182 | if (!ret) { | |
183 | dev_err(&client->dev, "already waiting for a command\n"); | |
184 | return -EBUSY; | |
185 | } | |
186 | ||
187 | dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n", | |
188 | buf[1], buf[2]); | |
189 | ||
190 | ts->command_waiting = buf[2]; | |
191 | ||
192 | mutex_lock(&ts->access_mutex); | |
193 | ret = i2c_master_send(client, buf, len); | |
194 | mutex_unlock(&ts->access_mutex); | |
195 | if (ret < 0) { | |
196 | dev_err(&client->dev, "i2c send data request error: %d\n", ret); | |
197 | goto unlock; | |
198 | } | |
199 | ||
200 | dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]); | |
201 | ||
202 | if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) { | |
203 | ret = -ETIME; | |
204 | goto unlock; | |
205 | } | |
206 | ||
207 | ret = ts->command_result; | |
208 | ||
209 | unlock: | |
210 | mutex_unlock(&ts->command_mutex); | |
211 | return ret; | |
212 | } | |
213 | ||
214 | static int zforce_command_wait(struct zforce_ts *ts, u8 cmd) | |
215 | { | |
216 | struct i2c_client *client = ts->client; | |
217 | char buf[3]; | |
218 | int ret; | |
219 | ||
220 | dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); | |
221 | ||
222 | buf[0] = FRAME_START; | |
223 | buf[1] = 1; /* data size, command only */ | |
224 | buf[2] = cmd; | |
225 | ||
226 | ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
227 | if (ret < 0) { | |
228 | dev_err(&client->dev, "i2c send data request error: %d\n", ret); | |
229 | return ret; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y) | |
236 | { | |
237 | struct i2c_client *client = ts->client; | |
238 | char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION, | |
239 | (x & 0xff), ((x >> 8) & 0xff), | |
240 | (y & 0xff), ((y >> 8) & 0xff) }; | |
241 | ||
242 | dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y); | |
243 | ||
244 | return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
245 | } | |
246 | ||
247 | static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger, | |
248 | u16 stylus) | |
249 | { | |
250 | struct i2c_client *client = ts->client; | |
251 | char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ, | |
252 | (idle & 0xff), ((idle >> 8) & 0xff), | |
253 | (finger & 0xff), ((finger >> 8) & 0xff), | |
254 | (stylus & 0xff), ((stylus >> 8) & 0xff) }; | |
255 | ||
ad697b96 LO |
256 | dev_dbg(&client->dev, |
257 | "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n", | |
c6d81bd7 HS |
258 | idle, finger, stylus); |
259 | ||
260 | return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
261 | } | |
262 | ||
263 | static int zforce_setconfig(struct zforce_ts *ts, char b1) | |
264 | { | |
265 | struct i2c_client *client = ts->client; | |
266 | char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG, | |
267 | b1, 0, 0, 0 }; | |
268 | ||
269 | dev_dbg(&client->dev, "set config to (%d)\n", b1); | |
270 | ||
271 | return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); | |
272 | } | |
273 | ||
274 | static int zforce_start(struct zforce_ts *ts) | |
275 | { | |
276 | struct i2c_client *client = ts->client; | |
87273364 | 277 | const struct zforce_ts_platdata *pdata = ts->pdata; |
c6d81bd7 HS |
278 | int ret; |
279 | ||
280 | dev_dbg(&client->dev, "starting device\n"); | |
281 | ||
282 | ret = zforce_command_wait(ts, COMMAND_INITIALIZE); | |
283 | if (ret) { | |
284 | dev_err(&client->dev, "Unable to initialize, %d\n", ret); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | ret = zforce_resolution(ts, pdata->x_max, pdata->y_max); | |
289 | if (ret) { | |
290 | dev_err(&client->dev, "Unable to set resolution, %d\n", ret); | |
291 | goto error; | |
292 | } | |
293 | ||
294 | ret = zforce_scan_frequency(ts, 10, 50, 50); | |
295 | if (ret) { | |
296 | dev_err(&client->dev, "Unable to set scan frequency, %d\n", | |
297 | ret); | |
298 | goto error; | |
299 | } | |
300 | ||
3c4396b4 WY |
301 | ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); |
302 | if (ret) { | |
c6d81bd7 HS |
303 | dev_err(&client->dev, "Unable to set config\n"); |
304 | goto error; | |
305 | } | |
306 | ||
307 | /* start sending touch events */ | |
308 | ret = zforce_command(ts, COMMAND_DATAREQUEST); | |
309 | if (ret) { | |
310 | dev_err(&client->dev, "Unable to request data\n"); | |
311 | goto error; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Per NN, initial cal. take max. of 200msec. | |
316 | * Allow time to complete this calibration | |
317 | */ | |
318 | msleep(200); | |
319 | ||
320 | return 0; | |
321 | ||
322 | error: | |
323 | zforce_command_wait(ts, COMMAND_DEACTIVATE); | |
324 | return ret; | |
325 | } | |
326 | ||
327 | static int zforce_stop(struct zforce_ts *ts) | |
328 | { | |
329 | struct i2c_client *client = ts->client; | |
330 | int ret; | |
331 | ||
332 | dev_dbg(&client->dev, "stopping device\n"); | |
333 | ||
334 | /* Deactivates touch sensing and puts the device into sleep. */ | |
335 | ret = zforce_command_wait(ts, COMMAND_DEACTIVATE); | |
336 | if (ret != 0) { | |
337 | dev_err(&client->dev, "could not deactivate device, %d\n", | |
338 | ret); | |
339 | return ret; | |
340 | } | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) | |
346 | { | |
347 | struct i2c_client *client = ts->client; | |
87273364 | 348 | const struct zforce_ts_platdata *pdata = ts->pdata; |
c6d81bd7 HS |
349 | struct zforce_point point; |
350 | int count, i, num = 0; | |
351 | ||
352 | count = payload[0]; | |
353 | if (count > ZFORCE_REPORT_POINTS) { | |
ad697b96 LO |
354 | dev_warn(&client->dev, |
355 | "too many coordinates %d, expected max %d\n", | |
c6d81bd7 HS |
356 | count, ZFORCE_REPORT_POINTS); |
357 | count = ZFORCE_REPORT_POINTS; | |
358 | } | |
359 | ||
360 | for (i = 0; i < count; i++) { | |
361 | point.coord_x = | |
362 | payload[9 * i + 2] << 8 | payload[9 * i + 1]; | |
363 | point.coord_y = | |
364 | payload[9 * i + 4] << 8 | payload[9 * i + 3]; | |
365 | ||
366 | if (point.coord_x > pdata->x_max || | |
367 | point.coord_y > pdata->y_max) { | |
368 | dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", | |
369 | point.coord_x, point.coord_y); | |
370 | point.coord_x = point.coord_y = 0; | |
371 | } | |
372 | ||
6984ab1a KW |
373 | point.state = payload[9 * i + 5] & 0x0f; |
374 | point.id = (payload[9 * i + 5] & 0xf0) >> 4; | |
c6d81bd7 HS |
375 | |
376 | /* determine touch major, minor and orientation */ | |
377 | point.area_major = max(payload[9 * i + 6], | |
378 | payload[9 * i + 7]); | |
379 | point.area_minor = min(payload[9 * i + 6], | |
380 | payload[9 * i + 7]); | |
381 | point.orientation = payload[9 * i + 6] > payload[9 * i + 7]; | |
382 | ||
383 | point.pressure = payload[9 * i + 8]; | |
384 | point.prblty = payload[9 * i + 9]; | |
385 | ||
386 | dev_dbg(&client->dev, | |
387 | "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n", | |
388 | i, count, point.state, point.id, | |
389 | point.pressure, point.prblty, | |
390 | point.coord_x, point.coord_y, | |
391 | point.area_major, point.area_minor, | |
392 | point.orientation); | |
393 | ||
394 | /* the zforce id starts with "1", so needs to be decreased */ | |
395 | input_mt_slot(ts->input, point.id - 1); | |
396 | ||
397 | input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, | |
398 | point.state != STATE_UP); | |
399 | ||
400 | if (point.state != STATE_UP) { | |
401 | input_report_abs(ts->input, ABS_MT_POSITION_X, | |
402 | point.coord_x); | |
403 | input_report_abs(ts->input, ABS_MT_POSITION_Y, | |
404 | point.coord_y); | |
405 | input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, | |
406 | point.area_major); | |
407 | input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, | |
408 | point.area_minor); | |
409 | input_report_abs(ts->input, ABS_MT_ORIENTATION, | |
410 | point.orientation); | |
411 | num++; | |
412 | } | |
413 | } | |
414 | ||
415 | input_mt_sync_frame(ts->input); | |
416 | ||
417 | input_mt_report_finger_count(ts->input, num); | |
418 | ||
419 | input_sync(ts->input); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | static int zforce_read_packet(struct zforce_ts *ts, u8 *buf) | |
425 | { | |
426 | struct i2c_client *client = ts->client; | |
427 | int ret; | |
428 | ||
429 | mutex_lock(&ts->access_mutex); | |
430 | ||
431 | /* read 2 byte message header */ | |
432 | ret = i2c_master_recv(client, buf, 2); | |
433 | if (ret < 0) { | |
434 | dev_err(&client->dev, "error reading header: %d\n", ret); | |
435 | goto unlock; | |
436 | } | |
437 | ||
438 | if (buf[PAYLOAD_HEADER] != FRAME_START) { | |
439 | dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); | |
440 | ret = -EIO; | |
441 | goto unlock; | |
442 | } | |
443 | ||
5aee41a6 | 444 | if (buf[PAYLOAD_LENGTH] == 0) { |
c6d81bd7 HS |
445 | dev_err(&client->dev, "invalid payload length: %d\n", |
446 | buf[PAYLOAD_LENGTH]); | |
447 | ret = -EIO; | |
448 | goto unlock; | |
449 | } | |
450 | ||
451 | /* read the message */ | |
452 | ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]); | |
453 | if (ret < 0) { | |
454 | dev_err(&client->dev, "error reading payload: %d\n", ret); | |
455 | goto unlock; | |
456 | } | |
457 | ||
458 | dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", | |
459 | buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); | |
460 | ||
461 | unlock: | |
462 | mutex_unlock(&ts->access_mutex); | |
463 | return ret; | |
464 | } | |
465 | ||
466 | static void zforce_complete(struct zforce_ts *ts, int cmd, int result) | |
467 | { | |
468 | struct i2c_client *client = ts->client; | |
469 | ||
470 | if (ts->command_waiting == cmd) { | |
471 | dev_dbg(&client->dev, "completing command 0x%x\n", cmd); | |
472 | ts->command_result = result; | |
473 | complete(&ts->command_done); | |
474 | } else { | |
475 | dev_dbg(&client->dev, "command %d not for us\n", cmd); | |
476 | } | |
477 | } | |
478 | ||
499e6127 HS |
479 | static irqreturn_t zforce_irq(int irq, void *dev_id) |
480 | { | |
481 | struct zforce_ts *ts = dev_id; | |
482 | struct i2c_client *client = ts->client; | |
483 | ||
484 | if (ts->suspended && device_may_wakeup(&client->dev)) | |
485 | pm_wakeup_event(&client->dev, 500); | |
486 | ||
487 | return IRQ_WAKE_THREAD; | |
488 | } | |
489 | ||
490 | static irqreturn_t zforce_irq_thread(int irq, void *dev_id) | |
c6d81bd7 HS |
491 | { |
492 | struct zforce_ts *ts = dev_id; | |
493 | struct i2c_client *client = ts->client; | |
c6d81bd7 | 494 | int ret; |
d333b606 | 495 | u8 payload_buffer[FRAME_MAXSIZE]; |
c6d81bd7 HS |
496 | u8 *payload; |
497 | ||
498 | /* | |
499e6127 | 499 | * When still suspended, return. |
c6d81bd7 HS |
500 | * Due to the level-interrupt we will get re-triggered later. |
501 | */ | |
502 | if (ts->suspended) { | |
c6d81bd7 HS |
503 | msleep(20); |
504 | return IRQ_HANDLED; | |
505 | } | |
506 | ||
507 | dev_dbg(&client->dev, "handling interrupt\n"); | |
508 | ||
509 | /* Don't emit wakeup events from commands run by zforce_suspend */ | |
510 | if (!ts->suspending && device_may_wakeup(&client->dev)) | |
511 | pm_stay_awake(&client->dev); | |
512 | ||
62f46669 DB |
513 | /* |
514 | * Run at least once and exit the loop if | |
515 | * - the optional interrupt GPIO isn't specified | |
516 | * (there is only one packet read per ISR invocation, then) | |
517 | * or | |
518 | * - the GPIO isn't active any more | |
519 | * (packet read until the level GPIO indicates that there is | |
520 | * no IRQ any more) | |
521 | */ | |
522 | do { | |
c6d81bd7 HS |
523 | ret = zforce_read_packet(ts, payload_buffer); |
524 | if (ret < 0) { | |
ad697b96 LO |
525 | dev_err(&client->dev, |
526 | "could not read packet, ret: %d\n", ret); | |
c6d81bd7 HS |
527 | break; |
528 | } | |
529 | ||
530 | payload = &payload_buffer[PAYLOAD_BODY]; | |
531 | ||
532 | switch (payload[RESPONSE_ID]) { | |
533 | case NOTIFICATION_TOUCH: | |
534 | /* | |
535 | * Always report touch-events received while | |
536 | * suspending, when being a wakeup source | |
537 | */ | |
538 | if (ts->suspending && device_may_wakeup(&client->dev)) | |
539 | pm_wakeup_event(&client->dev, 500); | |
540 | zforce_touch_event(ts, &payload[RESPONSE_DATA]); | |
541 | break; | |
542 | ||
543 | case NOTIFICATION_BOOTCOMPLETE: | |
544 | ts->boot_complete = payload[RESPONSE_DATA]; | |
545 | zforce_complete(ts, payload[RESPONSE_ID], 0); | |
546 | break; | |
547 | ||
548 | case RESPONSE_INITIALIZE: | |
549 | case RESPONSE_DEACTIVATE: | |
550 | case RESPONSE_SETCONFIG: | |
551 | case RESPONSE_RESOLUTION: | |
552 | case RESPONSE_SCANFREQ: | |
553 | zforce_complete(ts, payload[RESPONSE_ID], | |
554 | payload[RESPONSE_DATA]); | |
555 | break; | |
556 | ||
557 | case RESPONSE_STATUS: | |
558 | /* | |
559 | * Version Payload Results | |
560 | * [2:major] [2:minor] [2:build] [2:rev] | |
561 | */ | |
562 | ts->version_major = (payload[RESPONSE_DATA + 1] << 8) | | |
563 | payload[RESPONSE_DATA]; | |
564 | ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) | | |
565 | payload[RESPONSE_DATA + 2]; | |
566 | ts->version_build = (payload[RESPONSE_DATA + 5] << 8) | | |
567 | payload[RESPONSE_DATA + 4]; | |
568 | ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) | | |
569 | payload[RESPONSE_DATA + 6]; | |
ad697b96 LO |
570 | dev_dbg(&ts->client->dev, |
571 | "Firmware Version %04x:%04x %04x:%04x\n", | |
c6d81bd7 HS |
572 | ts->version_major, ts->version_minor, |
573 | ts->version_build, ts->version_rev); | |
574 | ||
575 | zforce_complete(ts, payload[RESPONSE_ID], 0); | |
576 | break; | |
577 | ||
578 | case NOTIFICATION_INVALID_COMMAND: | |
579 | dev_err(&ts->client->dev, "invalid command: 0x%x\n", | |
580 | payload[RESPONSE_DATA]); | |
581 | break; | |
582 | ||
583 | default: | |
ad697b96 LO |
584 | dev_err(&ts->client->dev, |
585 | "unrecognized response id: 0x%x\n", | |
c6d81bd7 HS |
586 | payload[RESPONSE_ID]); |
587 | break; | |
588 | } | |
62f46669 | 589 | } while (gpiod_get_value_cansleep(ts->gpio_int)); |
c6d81bd7 HS |
590 | |
591 | if (!ts->suspending && device_may_wakeup(&client->dev)) | |
592 | pm_relax(&client->dev); | |
593 | ||
594 | dev_dbg(&client->dev, "finished interrupt\n"); | |
595 | ||
596 | return IRQ_HANDLED; | |
597 | } | |
598 | ||
599 | static int zforce_input_open(struct input_dev *dev) | |
600 | { | |
601 | struct zforce_ts *ts = input_get_drvdata(dev); | |
c6d81bd7 | 602 | |
a47fcbc2 | 603 | return zforce_start(ts); |
c6d81bd7 HS |
604 | } |
605 | ||
606 | static void zforce_input_close(struct input_dev *dev) | |
607 | { | |
608 | struct zforce_ts *ts = input_get_drvdata(dev); | |
609 | struct i2c_client *client = ts->client; | |
610 | int ret; | |
611 | ||
612 | ret = zforce_stop(ts); | |
613 | if (ret) | |
614 | dev_warn(&client->dev, "stopping zforce failed\n"); | |
615 | ||
616 | return; | |
617 | } | |
618 | ||
02b6a58b | 619 | static int __maybe_unused zforce_suspend(struct device *dev) |
c6d81bd7 HS |
620 | { |
621 | struct i2c_client *client = to_i2c_client(dev); | |
622 | struct zforce_ts *ts = i2c_get_clientdata(client); | |
623 | struct input_dev *input = ts->input; | |
624 | int ret = 0; | |
625 | ||
626 | mutex_lock(&input->mutex); | |
627 | ts->suspending = true; | |
628 | ||
629 | /* | |
630 | * When configured as a wakeup source device should always wake | |
631 | * the system, therefore start device if necessary. | |
632 | */ | |
633 | if (device_may_wakeup(&client->dev)) { | |
634 | dev_dbg(&client->dev, "suspend while being a wakeup source\n"); | |
635 | ||
636 | /* Need to start device, if not open, to be a wakeup source. */ | |
637 | if (!input->users) { | |
638 | ret = zforce_start(ts); | |
639 | if (ret) | |
640 | goto unlock; | |
641 | } | |
642 | ||
643 | enable_irq_wake(client->irq); | |
644 | } else if (input->users) { | |
ad697b96 LO |
645 | dev_dbg(&client->dev, |
646 | "suspend without being a wakeup source\n"); | |
c6d81bd7 HS |
647 | |
648 | ret = zforce_stop(ts); | |
649 | if (ret) | |
650 | goto unlock; | |
651 | ||
652 | disable_irq(client->irq); | |
653 | } | |
654 | ||
655 | ts->suspended = true; | |
656 | ||
657 | unlock: | |
658 | ts->suspending = false; | |
659 | mutex_unlock(&input->mutex); | |
660 | ||
661 | return ret; | |
662 | } | |
663 | ||
02b6a58b | 664 | static int __maybe_unused zforce_resume(struct device *dev) |
c6d81bd7 HS |
665 | { |
666 | struct i2c_client *client = to_i2c_client(dev); | |
667 | struct zforce_ts *ts = i2c_get_clientdata(client); | |
668 | struct input_dev *input = ts->input; | |
669 | int ret = 0; | |
670 | ||
671 | mutex_lock(&input->mutex); | |
672 | ||
673 | ts->suspended = false; | |
674 | ||
675 | if (device_may_wakeup(&client->dev)) { | |
676 | dev_dbg(&client->dev, "resume from being a wakeup source\n"); | |
677 | ||
678 | disable_irq_wake(client->irq); | |
679 | ||
680 | /* need to stop device if it was not open on suspend */ | |
681 | if (!input->users) { | |
682 | ret = zforce_stop(ts); | |
683 | if (ret) | |
684 | goto unlock; | |
685 | } | |
686 | } else if (input->users) { | |
687 | dev_dbg(&client->dev, "resume without being a wakeup source\n"); | |
688 | ||
689 | enable_irq(client->irq); | |
690 | ||
691 | ret = zforce_start(ts); | |
692 | if (ret < 0) | |
693 | goto unlock; | |
694 | } | |
695 | ||
696 | unlock: | |
697 | mutex_unlock(&input->mutex); | |
698 | ||
699 | return ret; | |
700 | } | |
c6d81bd7 HS |
701 | |
702 | static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); | |
703 | ||
704 | static void zforce_reset(void *data) | |
705 | { | |
706 | struct zforce_ts *ts = data; | |
707 | ||
2d538095 | 708 | zforce_reset_assert(ts); |
39740370 HS |
709 | |
710 | udelay(10); | |
711 | ||
712 | if (!IS_ERR(ts->reg_vdd)) | |
713 | regulator_disable(ts->reg_vdd); | |
c6d81bd7 HS |
714 | } |
715 | ||
6f2e6c9b HS |
716 | static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev) |
717 | { | |
718 | struct zforce_ts_platdata *pdata; | |
719 | struct device_node *np = dev->of_node; | |
720 | ||
721 | if (!np) | |
722 | return ERR_PTR(-ENOENT); | |
723 | ||
724 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
725 | if (!pdata) { | |
726 | dev_err(dev, "failed to allocate platform data\n"); | |
727 | return ERR_PTR(-ENOMEM); | |
728 | } | |
729 | ||
6f2e6c9b HS |
730 | if (of_property_read_u32(np, "x-size", &pdata->x_max)) { |
731 | dev_err(dev, "failed to get x-size property\n"); | |
732 | return ERR_PTR(-EINVAL); | |
733 | } | |
734 | ||
735 | if (of_property_read_u32(np, "y-size", &pdata->y_max)) { | |
736 | dev_err(dev, "failed to get y-size property\n"); | |
737 | return ERR_PTR(-EINVAL); | |
738 | } | |
739 | ||
740 | return pdata; | |
741 | } | |
742 | ||
c6d81bd7 HS |
743 | static int zforce_probe(struct i2c_client *client, |
744 | const struct i2c_device_id *id) | |
745 | { | |
746 | const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); | |
747 | struct zforce_ts *ts; | |
748 | struct input_dev *input_dev; | |
749 | int ret; | |
750 | ||
6f2e6c9b HS |
751 | if (!pdata) { |
752 | pdata = zforce_parse_dt(&client->dev); | |
753 | if (IS_ERR(pdata)) | |
754 | return PTR_ERR(pdata); | |
755 | } | |
c6d81bd7 HS |
756 | |
757 | ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL); | |
758 | if (!ts) | |
759 | return -ENOMEM; | |
760 | ||
62f46669 DB |
761 | ts->gpio_rst = devm_gpiod_get_optional(&client->dev, "reset", |
762 | GPIOD_OUT_HIGH); | |
2d538095 DB |
763 | if (IS_ERR(ts->gpio_rst)) { |
764 | ret = PTR_ERR(ts->gpio_rst); | |
765 | dev_err(&client->dev, | |
766 | "failed to request reset GPIO: %d\n", ret); | |
c6d81bd7 HS |
767 | return ret; |
768 | } | |
769 | ||
62f46669 DB |
770 | if (ts->gpio_rst) { |
771 | ts->gpio_int = devm_gpiod_get_optional(&client->dev, "irq", | |
772 | GPIOD_IN); | |
773 | if (IS_ERR(ts->gpio_int)) { | |
774 | ret = PTR_ERR(ts->gpio_int); | |
775 | dev_err(&client->dev, | |
776 | "failed to request interrupt GPIO: %d\n", ret); | |
777 | return ret; | |
778 | } | |
779 | } else { | |
780 | /* | |
781 | * Deprecated GPIO handling for compatibility | |
782 | * with legacy binding. | |
783 | */ | |
784 | ||
785 | /* INT GPIO */ | |
786 | ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, | |
787 | GPIOD_IN); | |
788 | if (IS_ERR(ts->gpio_int)) { | |
789 | ret = PTR_ERR(ts->gpio_int); | |
790 | dev_err(&client->dev, | |
791 | "failed to request interrupt GPIO: %d\n", ret); | |
792 | return ret; | |
793 | } | |
794 | ||
795 | /* RST GPIO */ | |
796 | ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1, | |
797 | GPIOD_OUT_HIGH); | |
798 | if (IS_ERR(ts->gpio_rst)) { | |
799 | ret = PTR_ERR(ts->gpio_rst); | |
800 | dev_err(&client->dev, | |
801 | "failed to request reset GPIO: %d\n", ret); | |
802 | return ret; | |
803 | } | |
804 | } | |
805 | ||
39740370 HS |
806 | ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd"); |
807 | if (IS_ERR(ts->reg_vdd)) { | |
808 | ret = PTR_ERR(ts->reg_vdd); | |
809 | if (ret == -EPROBE_DEFER) | |
810 | return ret; | |
811 | } else { | |
812 | ret = regulator_enable(ts->reg_vdd); | |
813 | if (ret) | |
814 | return ret; | |
815 | ||
816 | /* | |
817 | * according to datasheet add 100us grace time after regular | |
818 | * regulator enable delay. | |
819 | */ | |
820 | udelay(100); | |
821 | } | |
822 | ||
c6d81bd7 HS |
823 | ret = devm_add_action(&client->dev, zforce_reset, ts); |
824 | if (ret) { | |
825 | dev_err(&client->dev, "failed to register reset action, %d\n", | |
826 | ret); | |
39740370 HS |
827 | |
828 | /* hereafter the regulator will be disabled by the action */ | |
829 | if (!IS_ERR(ts->reg_vdd)) | |
830 | regulator_disable(ts->reg_vdd); | |
831 | ||
c6d81bd7 HS |
832 | return ret; |
833 | } | |
834 | ||
835 | snprintf(ts->phys, sizeof(ts->phys), | |
836 | "%s/input0", dev_name(&client->dev)); | |
837 | ||
838 | input_dev = devm_input_allocate_device(&client->dev); | |
839 | if (!input_dev) { | |
840 | dev_err(&client->dev, "could not allocate input device\n"); | |
841 | return -ENOMEM; | |
842 | } | |
843 | ||
844 | mutex_init(&ts->access_mutex); | |
845 | mutex_init(&ts->command_mutex); | |
846 | ||
847 | ts->pdata = pdata; | |
848 | ts->client = client; | |
849 | ts->input = input_dev; | |
850 | ||
851 | input_dev->name = "Neonode zForce touchscreen"; | |
852 | input_dev->phys = ts->phys; | |
853 | input_dev->id.bustype = BUS_I2C; | |
854 | ||
855 | input_dev->open = zforce_input_open; | |
856 | input_dev->close = zforce_input_close; | |
857 | ||
858 | __set_bit(EV_KEY, input_dev->evbit); | |
859 | __set_bit(EV_SYN, input_dev->evbit); | |
860 | __set_bit(EV_ABS, input_dev->evbit); | |
861 | ||
862 | /* For multi touch */ | |
863 | input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, | |
864 | pdata->x_max, 0, 0); | |
865 | input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, | |
866 | pdata->y_max, 0, 0); | |
867 | ||
868 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, | |
869 | ZFORCE_MAX_AREA, 0, 0); | |
870 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, | |
871 | ZFORCE_MAX_AREA, 0, 0); | |
872 | input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); | |
873 | input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT); | |
874 | ||
875 | input_set_drvdata(ts->input, ts); | |
876 | ||
877 | init_completion(&ts->command_done); | |
878 | ||
879 | /* | |
880 | * The zforce pulls the interrupt low when it has data ready. | |
881 | * After it is triggered the isr thread runs until all the available | |
882 | * packets have been read and the interrupt is high again. | |
883 | * Therefore we can trigger the interrupt anytime it is low and do | |
884 | * not need to limit it to the interrupt edge. | |
885 | */ | |
499e6127 HS |
886 | ret = devm_request_threaded_irq(&client->dev, client->irq, |
887 | zforce_irq, zforce_irq_thread, | |
c6d81bd7 HS |
888 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
889 | input_dev->name, ts); | |
890 | if (ret) { | |
891 | dev_err(&client->dev, "irq %d request failed\n", client->irq); | |
892 | return ret; | |
893 | } | |
894 | ||
895 | i2c_set_clientdata(client, ts); | |
896 | ||
897 | /* let the controller boot */ | |
2d538095 | 898 | zforce_reset_deassert(ts); |
c6d81bd7 HS |
899 | |
900 | ts->command_waiting = NOTIFICATION_BOOTCOMPLETE; | |
901 | if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) | |
902 | dev_warn(&client->dev, "bootcomplete timed out\n"); | |
903 | ||
904 | /* need to start device to get version information */ | |
905 | ret = zforce_command_wait(ts, COMMAND_INITIALIZE); | |
906 | if (ret) { | |
907 | dev_err(&client->dev, "unable to initialize, %d\n", ret); | |
908 | return ret; | |
909 | } | |
910 | ||
deb49819 | 911 | /* this gets the firmware version among other information */ |
c6d81bd7 HS |
912 | ret = zforce_command_wait(ts, COMMAND_STATUS); |
913 | if (ret < 0) { | |
914 | dev_err(&client->dev, "couldn't get status, %d\n", ret); | |
915 | zforce_stop(ts); | |
916 | return ret; | |
917 | } | |
918 | ||
919 | /* stop device and put it into sleep until it is opened */ | |
920 | ret = zforce_stop(ts); | |
921 | if (ret < 0) | |
922 | return ret; | |
923 | ||
924 | device_set_wakeup_capable(&client->dev, true); | |
925 | ||
926 | ret = input_register_device(input_dev); | |
927 | if (ret) { | |
928 | dev_err(&client->dev, "could not register input device, %d\n", | |
929 | ret); | |
930 | return ret; | |
931 | } | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
936 | static struct i2c_device_id zforce_idtable[] = { | |
937 | { "zforce-ts", 0 }, | |
938 | { } | |
939 | }; | |
940 | MODULE_DEVICE_TABLE(i2c, zforce_idtable); | |
941 | ||
6f2e6c9b | 942 | #ifdef CONFIG_OF |
f3f63193 | 943 | static const struct of_device_id zforce_dt_idtable[] = { |
6f2e6c9b HS |
944 | { .compatible = "neonode,zforce" }, |
945 | {}, | |
946 | }; | |
947 | MODULE_DEVICE_TABLE(of, zforce_dt_idtable); | |
948 | #endif | |
949 | ||
c6d81bd7 HS |
950 | static struct i2c_driver zforce_driver = { |
951 | .driver = { | |
c6d81bd7 HS |
952 | .name = "zforce-ts", |
953 | .pm = &zforce_pm_ops, | |
6f2e6c9b | 954 | .of_match_table = of_match_ptr(zforce_dt_idtable), |
c6d81bd7 HS |
955 | }, |
956 | .probe = zforce_probe, | |
957 | .id_table = zforce_idtable, | |
958 | }; | |
959 | ||
960 | module_i2c_driver(zforce_driver); | |
961 | ||
962 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
963 | MODULE_DESCRIPTION("zForce TouchScreen Driver"); | |
964 | MODULE_LICENSE("GPL"); |