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f8c5938f AS |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // STMicroelectronics FTS Touchscreen device driver | |
3 | // | |
4 | // Copyright (c) 2017 Samsung Electronics Co., Ltd. | |
adf313f4 | 5 | // Copyright (c) 2017 Andi Shyti <andi@etezian.org> |
78bcac7b AS |
6 | |
7 | #include <linux/delay.h> | |
8 | #include <linux/i2c.h> | |
9 | #include <linux/input/mt.h> | |
10 | #include <linux/input/touchscreen.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/irq.h> | |
13 | #include <linux/leds.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/pm_runtime.h> | |
16 | #include <linux/regulator/consumer.h> | |
17 | ||
18 | /* I2C commands */ | |
19 | #define STMFTS_READ_INFO 0x80 | |
20 | #define STMFTS_READ_STATUS 0x84 | |
21 | #define STMFTS_READ_ONE_EVENT 0x85 | |
22 | #define STMFTS_READ_ALL_EVENT 0x86 | |
23 | #define STMFTS_LATEST_EVENT 0x87 | |
24 | #define STMFTS_SLEEP_IN 0x90 | |
25 | #define STMFTS_SLEEP_OUT 0x91 | |
26 | #define STMFTS_MS_MT_SENSE_OFF 0x92 | |
27 | #define STMFTS_MS_MT_SENSE_ON 0x93 | |
28 | #define STMFTS_SS_HOVER_SENSE_OFF 0x94 | |
29 | #define STMFTS_SS_HOVER_SENSE_ON 0x95 | |
30 | #define STMFTS_MS_KEY_SENSE_OFF 0x9a | |
31 | #define STMFTS_MS_KEY_SENSE_ON 0x9b | |
32 | #define STMFTS_SYSTEM_RESET 0xa0 | |
33 | #define STMFTS_CLEAR_EVENT_STACK 0xa1 | |
34 | #define STMFTS_FULL_FORCE_CALIBRATION 0xa2 | |
35 | #define STMFTS_MS_CX_TUNING 0xa3 | |
36 | #define STMFTS_SS_CX_TUNING 0xa4 | |
37 | ||
38 | /* events */ | |
39 | #define STMFTS_EV_NO_EVENT 0x00 | |
40 | #define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02 | |
41 | #define STMFTS_EV_MULTI_TOUCH_ENTER 0x03 | |
42 | #define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04 | |
43 | #define STMFTS_EV_MULTI_TOUCH_MOTION 0x05 | |
44 | #define STMFTS_EV_HOVER_ENTER 0x07 | |
45 | #define STMFTS_EV_HOVER_LEAVE 0x08 | |
46 | #define STMFTS_EV_HOVER_MOTION 0x09 | |
47 | #define STMFTS_EV_KEY_STATUS 0x0e | |
48 | #define STMFTS_EV_ERROR 0x0f | |
49 | #define STMFTS_EV_CONTROLLER_READY 0x10 | |
50 | #define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11 | |
51 | #define STMFTS_EV_STATUS 0x16 | |
52 | #define STMFTS_EV_DEBUG 0xdb | |
53 | ||
54 | /* multi touch related event masks */ | |
55 | #define STMFTS_MASK_EVENT_ID 0x0f | |
56 | #define STMFTS_MASK_TOUCH_ID 0xf0 | |
57 | #define STMFTS_MASK_LEFT_EVENT 0x0f | |
58 | #define STMFTS_MASK_X_MSB 0x0f | |
59 | #define STMFTS_MASK_Y_LSB 0xf0 | |
60 | ||
61 | /* key related event masks */ | |
62 | #define STMFTS_MASK_KEY_NO_TOUCH 0x00 | |
63 | #define STMFTS_MASK_KEY_MENU 0x01 | |
64 | #define STMFTS_MASK_KEY_BACK 0x02 | |
65 | ||
66 | #define STMFTS_EVENT_SIZE 8 | |
67 | #define STMFTS_STACK_DEPTH 32 | |
68 | #define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH) | |
69 | #define STMFTS_MAX_FINGERS 10 | |
70 | #define STMFTS_DEV_NAME "stmfts" | |
71 | ||
72 | enum stmfts_regulators { | |
73 | STMFTS_REGULATOR_VDD, | |
74 | STMFTS_REGULATOR_AVDD, | |
75 | }; | |
76 | ||
77 | struct stmfts_data { | |
78 | struct i2c_client *client; | |
79 | struct input_dev *input; | |
80 | struct led_classdev led_cdev; | |
81 | struct mutex mutex; | |
82 | ||
83 | struct touchscreen_properties prop; | |
84 | ||
85 | struct regulator_bulk_data regulators[2]; | |
86 | ||
87 | /* | |
88 | * Presence of ledvdd will be used also to check | |
89 | * whether the LED is supported. | |
90 | */ | |
91 | struct regulator *ledvdd; | |
92 | ||
93 | u16 chip_id; | |
94 | u8 chip_ver; | |
95 | u16 fw_ver; | |
96 | u8 config_id; | |
97 | u8 config_ver; | |
98 | ||
99 | u8 data[STMFTS_DATA_MAX_SIZE]; | |
100 | ||
101 | struct completion cmd_done; | |
102 | ||
103 | bool use_key; | |
104 | bool led_status; | |
105 | bool hover_enabled; | |
106 | bool running; | |
107 | }; | |
108 | ||
109 | static void stmfts_brightness_set(struct led_classdev *led_cdev, | |
110 | enum led_brightness value) | |
111 | { | |
112 | struct stmfts_data *sdata = container_of(led_cdev, | |
113 | struct stmfts_data, led_cdev); | |
114 | int err; | |
115 | ||
116 | if (value == sdata->led_status || !sdata->ledvdd) | |
117 | return; | |
118 | ||
119 | if (!value) { | |
120 | regulator_disable(sdata->ledvdd); | |
121 | } else { | |
122 | err = regulator_enable(sdata->ledvdd); | |
123 | if (err) | |
124 | dev_warn(&sdata->client->dev, | |
125 | "failed to disable ledvdd regulator: %d\n", | |
126 | err); | |
127 | } | |
128 | ||
129 | sdata->led_status = value; | |
130 | } | |
131 | ||
132 | static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev) | |
133 | { | |
134 | struct stmfts_data *sdata = container_of(led_cdev, | |
135 | struct stmfts_data, led_cdev); | |
136 | ||
137 | return !!regulator_is_enabled(sdata->ledvdd); | |
138 | } | |
139 | ||
140 | /* | |
141 | * We can't simply use i2c_smbus_read_i2c_block_data because we | |
142 | * need to read more than 255 bytes ( | |
143 | */ | |
144 | static int stmfts_read_events(struct stmfts_data *sdata) | |
145 | { | |
146 | u8 cmd = STMFTS_READ_ALL_EVENT; | |
147 | struct i2c_msg msgs[2] = { | |
148 | { | |
149 | .addr = sdata->client->addr, | |
150 | .len = 1, | |
151 | .buf = &cmd, | |
152 | }, | |
153 | { | |
154 | .addr = sdata->client->addr, | |
155 | .flags = I2C_M_RD, | |
156 | .len = STMFTS_DATA_MAX_SIZE, | |
157 | .buf = sdata->data, | |
158 | }, | |
159 | }; | |
160 | int ret; | |
161 | ||
162 | ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs)); | |
163 | if (ret < 0) | |
164 | return ret; | |
165 | ||
166 | return ret == ARRAY_SIZE(msgs) ? 0 : -EIO; | |
167 | } | |
168 | ||
169 | static void stmfts_report_contact_event(struct stmfts_data *sdata, | |
170 | const u8 event[]) | |
171 | { | |
172 | u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; | |
173 | u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8); | |
174 | u16 y = (event[2] >> 4) | (event[3] << 4); | |
175 | u8 maj = event[4]; | |
176 | u8 min = event[5]; | |
177 | u8 orientation = event[6]; | |
178 | u8 area = event[7]; | |
179 | ||
180 | input_mt_slot(sdata->input, slot_id); | |
181 | ||
182 | input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true); | |
183 | input_report_abs(sdata->input, ABS_MT_POSITION_X, x); | |
184 | input_report_abs(sdata->input, ABS_MT_POSITION_Y, y); | |
185 | input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj); | |
186 | input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min); | |
187 | input_report_abs(sdata->input, ABS_MT_PRESSURE, area); | |
188 | input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation); | |
189 | ||
190 | input_sync(sdata->input); | |
191 | } | |
192 | ||
193 | static void stmfts_report_contact_release(struct stmfts_data *sdata, | |
194 | const u8 event[]) | |
195 | { | |
196 | u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4; | |
197 | ||
198 | input_mt_slot(sdata->input, slot_id); | |
199 | input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false); | |
200 | ||
201 | input_sync(sdata->input); | |
202 | } | |
203 | ||
204 | static void stmfts_report_hover_event(struct stmfts_data *sdata, | |
205 | const u8 event[]) | |
206 | { | |
207 | u16 x = (event[2] << 4) | (event[4] >> 4); | |
208 | u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB); | |
209 | u8 z = event[5]; | |
210 | ||
211 | input_report_abs(sdata->input, ABS_X, x); | |
212 | input_report_abs(sdata->input, ABS_Y, y); | |
213 | input_report_abs(sdata->input, ABS_DISTANCE, z); | |
214 | ||
215 | input_sync(sdata->input); | |
216 | } | |
217 | ||
218 | static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[]) | |
219 | { | |
220 | switch (event[2]) { | |
221 | case 0: | |
222 | input_report_key(sdata->input, KEY_BACK, 0); | |
223 | input_report_key(sdata->input, KEY_MENU, 0); | |
224 | break; | |
225 | ||
226 | case STMFTS_MASK_KEY_BACK: | |
227 | input_report_key(sdata->input, KEY_BACK, 1); | |
228 | break; | |
229 | ||
230 | case STMFTS_MASK_KEY_MENU: | |
231 | input_report_key(sdata->input, KEY_MENU, 1); | |
232 | break; | |
233 | ||
234 | default: | |
235 | dev_warn(&sdata->client->dev, | |
236 | "unknown key event: %#02x\n", event[2]); | |
237 | break; | |
238 | } | |
239 | ||
240 | input_sync(sdata->input); | |
241 | } | |
242 | ||
243 | static void stmfts_parse_events(struct stmfts_data *sdata) | |
244 | { | |
245 | int i; | |
246 | ||
247 | for (i = 0; i < STMFTS_STACK_DEPTH; i++) { | |
248 | u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE]; | |
249 | ||
250 | switch (event[0]) { | |
251 | ||
252 | case STMFTS_EV_CONTROLLER_READY: | |
253 | case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY: | |
254 | case STMFTS_EV_STATUS: | |
255 | complete(&sdata->cmd_done); | |
256 | /* fall through */ | |
257 | ||
258 | case STMFTS_EV_NO_EVENT: | |
259 | case STMFTS_EV_DEBUG: | |
260 | return; | |
261 | } | |
262 | ||
263 | switch (event[0] & STMFTS_MASK_EVENT_ID) { | |
264 | ||
265 | case STMFTS_EV_MULTI_TOUCH_ENTER: | |
266 | case STMFTS_EV_MULTI_TOUCH_MOTION: | |
267 | stmfts_report_contact_event(sdata, event); | |
268 | break; | |
269 | ||
270 | case STMFTS_EV_MULTI_TOUCH_LEAVE: | |
271 | stmfts_report_contact_release(sdata, event); | |
272 | break; | |
273 | ||
274 | case STMFTS_EV_HOVER_ENTER: | |
275 | case STMFTS_EV_HOVER_LEAVE: | |
276 | case STMFTS_EV_HOVER_MOTION: | |
277 | stmfts_report_hover_event(sdata, event); | |
278 | break; | |
279 | ||
280 | case STMFTS_EV_KEY_STATUS: | |
281 | stmfts_report_key_event(sdata, event); | |
282 | break; | |
283 | ||
284 | case STMFTS_EV_ERROR: | |
285 | dev_warn(&sdata->client->dev, | |
286 | "error code: 0x%x%x%x%x%x%x", | |
287 | event[6], event[5], event[4], | |
288 | event[3], event[2], event[1]); | |
289 | break; | |
290 | ||
291 | default: | |
292 | dev_err(&sdata->client->dev, | |
293 | "unknown event %#02x\n", event[0]); | |
294 | } | |
295 | } | |
296 | } | |
297 | ||
298 | static irqreturn_t stmfts_irq_handler(int irq, void *dev) | |
299 | { | |
300 | struct stmfts_data *sdata = dev; | |
301 | int err; | |
302 | ||
303 | mutex_lock(&sdata->mutex); | |
304 | ||
305 | err = stmfts_read_events(sdata); | |
306 | if (unlikely(err)) | |
307 | dev_err(&sdata->client->dev, | |
308 | "failed to read events: %d\n", err); | |
309 | else | |
310 | stmfts_parse_events(sdata); | |
311 | ||
312 | mutex_unlock(&sdata->mutex); | |
313 | return IRQ_HANDLED; | |
314 | } | |
315 | ||
316 | static int stmfts_command(struct stmfts_data *sdata, const u8 cmd) | |
317 | { | |
318 | int err; | |
319 | ||
320 | reinit_completion(&sdata->cmd_done); | |
321 | ||
322 | err = i2c_smbus_write_byte(sdata->client, cmd); | |
323 | if (err) | |
324 | return err; | |
325 | ||
326 | if (!wait_for_completion_timeout(&sdata->cmd_done, | |
327 | msecs_to_jiffies(1000))) | |
328 | return -ETIMEDOUT; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static int stmfts_input_open(struct input_dev *dev) | |
334 | { | |
335 | struct stmfts_data *sdata = input_get_drvdata(dev); | |
336 | int err; | |
337 | ||
338 | err = pm_runtime_get_sync(&sdata->client->dev); | |
339 | if (err < 0) | |
340 | return err; | |
341 | ||
342 | err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON); | |
343 | if (err) | |
344 | return err; | |
345 | ||
346 | mutex_lock(&sdata->mutex); | |
347 | sdata->running = true; | |
348 | ||
349 | if (sdata->hover_enabled) { | |
350 | err = i2c_smbus_write_byte(sdata->client, | |
351 | STMFTS_SS_HOVER_SENSE_ON); | |
352 | if (err) | |
353 | dev_warn(&sdata->client->dev, | |
354 | "failed to enable hover\n"); | |
355 | } | |
356 | mutex_unlock(&sdata->mutex); | |
357 | ||
358 | if (sdata->use_key) { | |
359 | err = i2c_smbus_write_byte(sdata->client, | |
360 | STMFTS_MS_KEY_SENSE_ON); | |
361 | if (err) | |
362 | /* I can still use only the touch screen */ | |
363 | dev_warn(&sdata->client->dev, | |
364 | "failed to enable touchkey\n"); | |
365 | } | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static void stmfts_input_close(struct input_dev *dev) | |
371 | { | |
372 | struct stmfts_data *sdata = input_get_drvdata(dev); | |
373 | int err; | |
374 | ||
375 | err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF); | |
376 | if (err) | |
377 | dev_warn(&sdata->client->dev, | |
378 | "failed to disable touchscreen: %d\n", err); | |
379 | ||
380 | mutex_lock(&sdata->mutex); | |
381 | ||
382 | sdata->running = false; | |
383 | ||
384 | if (sdata->hover_enabled) { | |
385 | err = i2c_smbus_write_byte(sdata->client, | |
386 | STMFTS_SS_HOVER_SENSE_OFF); | |
387 | if (err) | |
388 | dev_warn(&sdata->client->dev, | |
389 | "failed to disable hover: %d\n", err); | |
390 | } | |
391 | mutex_unlock(&sdata->mutex); | |
392 | ||
393 | if (sdata->use_key) { | |
394 | err = i2c_smbus_write_byte(sdata->client, | |
395 | STMFTS_MS_KEY_SENSE_OFF); | |
396 | if (err) | |
397 | dev_warn(&sdata->client->dev, | |
398 | "failed to disable touchkey: %d\n", err); | |
399 | } | |
400 | ||
401 | pm_runtime_put_sync(&sdata->client->dev); | |
402 | } | |
403 | ||
404 | static ssize_t stmfts_sysfs_chip_id(struct device *dev, | |
405 | struct device_attribute *attr, char *buf) | |
406 | { | |
407 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
408 | ||
409 | return sprintf(buf, "%#x\n", sdata->chip_id); | |
410 | } | |
411 | ||
412 | static ssize_t stmfts_sysfs_chip_version(struct device *dev, | |
413 | struct device_attribute *attr, char *buf) | |
414 | { | |
415 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
416 | ||
417 | return sprintf(buf, "%u\n", sdata->chip_ver); | |
418 | } | |
419 | ||
420 | static ssize_t stmfts_sysfs_fw_ver(struct device *dev, | |
421 | struct device_attribute *attr, char *buf) | |
422 | { | |
423 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
424 | ||
425 | return sprintf(buf, "%u\n", sdata->fw_ver); | |
426 | } | |
427 | ||
428 | static ssize_t stmfts_sysfs_config_id(struct device *dev, | |
429 | struct device_attribute *attr, char *buf) | |
430 | { | |
431 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
432 | ||
433 | return sprintf(buf, "%#x\n", sdata->config_id); | |
434 | } | |
435 | ||
436 | static ssize_t stmfts_sysfs_config_version(struct device *dev, | |
437 | struct device_attribute *attr, char *buf) | |
438 | { | |
439 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
440 | ||
441 | return sprintf(buf, "%u\n", sdata->config_ver); | |
442 | } | |
443 | ||
444 | static ssize_t stmfts_sysfs_read_status(struct device *dev, | |
445 | struct device_attribute *attr, char *buf) | |
446 | { | |
447 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
448 | u8 status[4]; | |
449 | int err; | |
450 | ||
451 | err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS, | |
452 | sizeof(status), status); | |
453 | if (err) | |
454 | return err; | |
455 | ||
456 | return sprintf(buf, "%#02x\n", status[0]); | |
457 | } | |
458 | ||
459 | static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev, | |
460 | struct device_attribute *attr, char *buf) | |
461 | { | |
462 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
463 | ||
464 | return sprintf(buf, "%u\n", sdata->hover_enabled); | |
465 | } | |
466 | ||
467 | static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev, | |
468 | struct device_attribute *attr, | |
469 | const char *buf, size_t len) | |
470 | { | |
471 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
472 | unsigned long value; | |
473 | int err = 0; | |
474 | ||
475 | if (kstrtoul(buf, 0, &value)) | |
476 | return -EINVAL; | |
477 | ||
478 | mutex_lock(&sdata->mutex); | |
479 | ||
480 | if (value & sdata->hover_enabled) | |
481 | goto out; | |
482 | ||
483 | if (sdata->running) | |
484 | err = i2c_smbus_write_byte(sdata->client, | |
485 | value ? STMFTS_SS_HOVER_SENSE_ON : | |
486 | STMFTS_SS_HOVER_SENSE_OFF); | |
487 | ||
488 | if (!err) | |
489 | sdata->hover_enabled = !!value; | |
490 | ||
491 | out: | |
492 | mutex_unlock(&sdata->mutex); | |
493 | ||
494 | return len; | |
495 | } | |
496 | ||
497 | static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL); | |
498 | static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL); | |
499 | static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL); | |
500 | static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL); | |
501 | static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL); | |
502 | static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL); | |
503 | static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read, | |
504 | stmfts_sysfs_hover_enable_write); | |
505 | ||
506 | static struct attribute *stmfts_sysfs_attrs[] = { | |
507 | &dev_attr_chip_id.attr, | |
508 | &dev_attr_chip_version.attr, | |
509 | &dev_attr_fw_ver.attr, | |
510 | &dev_attr_config_id.attr, | |
511 | &dev_attr_config_version.attr, | |
512 | &dev_attr_status.attr, | |
513 | &dev_attr_hover_enable.attr, | |
514 | NULL | |
515 | }; | |
516 | ||
517 | static struct attribute_group stmfts_attribute_group = { | |
518 | .attrs = stmfts_sysfs_attrs | |
519 | }; | |
520 | ||
521 | static int stmfts_power_on(struct stmfts_data *sdata) | |
522 | { | |
523 | int err; | |
524 | u8 reg[8]; | |
525 | ||
526 | err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators), | |
527 | sdata->regulators); | |
528 | if (err) | |
529 | return err; | |
530 | ||
531 | /* | |
532 | * The datasheet does not specify the power on time, but considering | |
533 | * that the reset time is < 10ms, I sleep 20ms to be sure | |
534 | */ | |
535 | msleep(20); | |
536 | ||
537 | err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO, | |
538 | sizeof(reg), reg); | |
539 | if (err < 0) | |
540 | return err; | |
541 | if (err != sizeof(reg)) | |
542 | return -EIO; | |
543 | ||
544 | sdata->chip_id = be16_to_cpup((__be16 *)®[6]); | |
545 | sdata->chip_ver = reg[0]; | |
546 | sdata->fw_ver = be16_to_cpup((__be16 *)®[2]); | |
547 | sdata->config_id = reg[4]; | |
548 | sdata->config_ver = reg[5]; | |
549 | ||
550 | enable_irq(sdata->client->irq); | |
551 | ||
552 | msleep(50); | |
553 | ||
554 | err = stmfts_command(sdata, STMFTS_SYSTEM_RESET); | |
555 | if (err) | |
556 | return err; | |
557 | ||
558 | err = stmfts_command(sdata, STMFTS_SLEEP_OUT); | |
559 | if (err) | |
560 | return err; | |
561 | ||
562 | /* optional tuning */ | |
563 | err = stmfts_command(sdata, STMFTS_MS_CX_TUNING); | |
564 | if (err) | |
565 | dev_warn(&sdata->client->dev, | |
566 | "failed to perform mutual auto tune: %d\n", err); | |
567 | ||
568 | /* optional tuning */ | |
569 | err = stmfts_command(sdata, STMFTS_SS_CX_TUNING); | |
570 | if (err) | |
571 | dev_warn(&sdata->client->dev, | |
572 | "failed to perform self auto tune: %d\n", err); | |
573 | ||
574 | err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION); | |
575 | if (err) | |
576 | return err; | |
577 | ||
578 | /* | |
579 | * At this point no one is using the touchscreen | |
580 | * and I don't really care about the return value | |
581 | */ | |
582 | (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static void stmfts_power_off(void *data) | |
588 | { | |
589 | struct stmfts_data *sdata = data; | |
590 | ||
591 | disable_irq(sdata->client->irq); | |
592 | regulator_bulk_disable(ARRAY_SIZE(sdata->regulators), | |
593 | sdata->regulators); | |
594 | } | |
595 | ||
596 | /* This function is void because I don't want to prevent using the touch key | |
597 | * only because the LEDs don't get registered | |
598 | */ | |
599 | static int stmfts_enable_led(struct stmfts_data *sdata) | |
600 | { | |
601 | int err; | |
602 | ||
603 | /* get the regulator for powering the leds on */ | |
604 | sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd"); | |
605 | if (IS_ERR(sdata->ledvdd)) | |
606 | return PTR_ERR(sdata->ledvdd); | |
607 | ||
608 | sdata->led_cdev.name = STMFTS_DEV_NAME; | |
609 | sdata->led_cdev.max_brightness = LED_ON; | |
610 | sdata->led_cdev.brightness = LED_OFF; | |
611 | sdata->led_cdev.brightness_set = stmfts_brightness_set; | |
612 | sdata->led_cdev.brightness_get = stmfts_brightness_get; | |
613 | ||
614 | err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev); | |
615 | if (err) { | |
616 | devm_regulator_put(sdata->ledvdd); | |
617 | return err; | |
618 | } | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
623 | static int stmfts_probe(struct i2c_client *client, | |
624 | const struct i2c_device_id *id) | |
625 | { | |
626 | int err; | |
627 | struct stmfts_data *sdata; | |
628 | ||
629 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | | |
630 | I2C_FUNC_SMBUS_BYTE_DATA | | |
631 | I2C_FUNC_SMBUS_I2C_BLOCK)) | |
632 | return -ENODEV; | |
633 | ||
634 | sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL); | |
635 | if (!sdata) | |
636 | return -ENOMEM; | |
637 | ||
638 | i2c_set_clientdata(client, sdata); | |
639 | ||
640 | sdata->client = client; | |
641 | mutex_init(&sdata->mutex); | |
642 | init_completion(&sdata->cmd_done); | |
643 | ||
644 | sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd"; | |
645 | sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd"; | |
646 | err = devm_regulator_bulk_get(&client->dev, | |
647 | ARRAY_SIZE(sdata->regulators), | |
648 | sdata->regulators); | |
649 | if (err) | |
650 | return err; | |
651 | ||
652 | sdata->input = devm_input_allocate_device(&client->dev); | |
653 | if (!sdata->input) | |
654 | return -ENOMEM; | |
655 | ||
656 | sdata->input->name = STMFTS_DEV_NAME; | |
657 | sdata->input->id.bustype = BUS_I2C; | |
658 | sdata->input->open = stmfts_input_open; | |
659 | sdata->input->close = stmfts_input_close; | |
660 | ||
c9bfb2f0 CC |
661 | input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X); |
662 | input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y); | |
78bcac7b AS |
663 | touchscreen_parse_properties(sdata->input, true, &sdata->prop); |
664 | ||
78bcac7b AS |
665 | input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); |
666 | input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0); | |
667 | input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0); | |
668 | input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0); | |
669 | input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0); | |
670 | ||
671 | sdata->use_key = device_property_read_bool(&client->dev, | |
672 | "touch-key-connected"); | |
673 | if (sdata->use_key) { | |
674 | input_set_capability(sdata->input, EV_KEY, KEY_MENU); | |
675 | input_set_capability(sdata->input, EV_KEY, KEY_BACK); | |
676 | } | |
677 | ||
678 | err = input_mt_init_slots(sdata->input, | |
679 | STMFTS_MAX_FINGERS, INPUT_MT_DIRECT); | |
680 | if (err) | |
681 | return err; | |
682 | ||
683 | input_set_drvdata(sdata->input, sdata); | |
684 | ||
cba04cdf AS |
685 | /* |
686 | * stmfts_power_on expects interrupt to be disabled, but | |
687 | * at this point the device is still off and I do not trust | |
688 | * the status of the irq line that can generate some spurious | |
689 | * interrupts. To be on the safe side it's better to not enable | |
690 | * the interrupts during their request. | |
691 | */ | |
692 | irq_set_status_flags(client->irq, IRQ_NOAUTOEN); | |
78bcac7b AS |
693 | err = devm_request_threaded_irq(&client->dev, client->irq, |
694 | NULL, stmfts_irq_handler, | |
695 | IRQF_ONESHOT, | |
696 | "stmfts_irq", sdata); | |
697 | if (err) | |
698 | return err; | |
699 | ||
78bcac7b AS |
700 | dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n"); |
701 | ||
702 | err = stmfts_power_on(sdata); | |
703 | if (err) | |
704 | return err; | |
705 | ||
706 | err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata); | |
707 | if (err) | |
708 | return err; | |
709 | ||
710 | err = input_register_device(sdata->input); | |
711 | if (err) | |
712 | return err; | |
713 | ||
714 | if (sdata->use_key) { | |
715 | err = stmfts_enable_led(sdata); | |
716 | if (err) { | |
717 | /* | |
718 | * Even if the LEDs have failed to be initialized and | |
719 | * used in the driver, I can still use the device even | |
720 | * without LEDs. The ledvdd regulator pointer will be | |
721 | * used as a flag. | |
722 | */ | |
723 | dev_warn(&client->dev, "unable to use touchkey leds\n"); | |
724 | sdata->ledvdd = NULL; | |
725 | } | |
726 | } | |
727 | ||
c2690bd6 | 728 | err = devm_device_add_group(&client->dev, &stmfts_attribute_group); |
78bcac7b AS |
729 | if (err) |
730 | return err; | |
731 | ||
732 | pm_runtime_enable(&client->dev); | |
1d960003 | 733 | device_enable_async_suspend(&client->dev); |
78bcac7b AS |
734 | |
735 | return 0; | |
736 | } | |
737 | ||
738 | static int stmfts_remove(struct i2c_client *client) | |
739 | { | |
740 | pm_runtime_disable(&client->dev); | |
78bcac7b AS |
741 | |
742 | return 0; | |
743 | } | |
744 | ||
d4c9354b | 745 | static int __maybe_unused stmfts_runtime_suspend(struct device *dev) |
78bcac7b AS |
746 | { |
747 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
748 | int ret; | |
749 | ||
750 | ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN); | |
751 | if (ret) | |
752 | dev_warn(dev, "failed to suspend device: %d\n", ret); | |
753 | ||
754 | return ret; | |
755 | } | |
756 | ||
d4c9354b | 757 | static int __maybe_unused stmfts_runtime_resume(struct device *dev) |
78bcac7b AS |
758 | { |
759 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
760 | int ret; | |
761 | ||
762 | ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT); | |
763 | if (ret) | |
764 | dev_err(dev, "failed to resume device: %d\n", ret); | |
765 | ||
766 | return ret; | |
767 | } | |
768 | ||
769 | static int __maybe_unused stmfts_suspend(struct device *dev) | |
770 | { | |
771 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
772 | ||
773 | stmfts_power_off(sdata); | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
778 | static int __maybe_unused stmfts_resume(struct device *dev) | |
779 | { | |
780 | struct stmfts_data *sdata = dev_get_drvdata(dev); | |
781 | ||
782 | return stmfts_power_on(sdata); | |
783 | } | |
784 | ||
785 | static const struct dev_pm_ops stmfts_pm_ops = { | |
786 | SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume) | |
787 | SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL) | |
788 | }; | |
789 | ||
790 | #ifdef CONFIG_OF | |
791 | static const struct of_device_id stmfts_of_match[] = { | |
792 | { .compatible = "st,stmfts", }, | |
793 | { }, | |
794 | }; | |
795 | MODULE_DEVICE_TABLE(of, stmfts_of_match); | |
796 | #endif | |
797 | ||
798 | static const struct i2c_device_id stmfts_id[] = { | |
799 | { "stmfts", 0 }, | |
800 | { }, | |
801 | }; | |
802 | MODULE_DEVICE_TABLE(i2c, stmfts_id); | |
803 | ||
804 | static struct i2c_driver stmfts_driver = { | |
805 | .driver = { | |
806 | .name = STMFTS_DEV_NAME, | |
807 | .of_match_table = of_match_ptr(stmfts_of_match), | |
808 | .pm = &stmfts_pm_ops, | |
1d960003 | 809 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
78bcac7b AS |
810 | }, |
811 | .probe = stmfts_probe, | |
812 | .remove = stmfts_remove, | |
813 | .id_table = stmfts_id, | |
814 | }; | |
815 | ||
816 | module_i2c_driver(stmfts_driver); | |
817 | ||
818 | MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>"); | |
819 | MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen"); | |
820 | MODULE_LICENSE("GPL v2"); |