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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / input / mouse / elan_i2c_core.c
blobbef73822315d5139ab81804c209d3d90f1648d2b
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Elan I2C/SMBus Touchpad driver
4 *
5 * Copyright (c) 2013 ELAN Microelectronics Corp.
6 *
7 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
8 * Author: KT Liao <kt.liao@emc.com.tw>
9 * Version: 1.6.3
10 *
11 * Based on cyapa driver:
12 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
13 * copyright (c) 2011-2012 Google, Inc.
14 *
15 * Trademarks are the property of their respective owners.
16 */
17
18 #include <linux/acpi.h>
19 #include <linux/delay.h>
20 #include <linux/device.h>
21 #include <linux/firmware.h>
22 #include <linux/i2c.h>
23 #include <linux/init.h>
24 #include <linux/input/mt.h>
25 #include <linux/interrupt.h>
26 #include <linux/irq.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/kernel.h>
30 #include <linux/sched.h>
31 #include <linux/input.h>
32 #include <linux/uaccess.h>
33 #include <linux/jiffies.h>
34 #include <linux/completion.h>
35 #include <linux/of.h>
36 #include <linux/property.h>
37 #include <linux/regulator/consumer.h>
38 #include <asm/unaligned.h>
39
40 #include "elan_i2c.h"
41
42 #define DRIVER_NAME "elan_i2c"
43 #define ELAN_VENDOR_ID 0x04f3
44 #define ETP_MAX_PRESSURE 255
45 #define ETP_FWIDTH_REDUCE 90
46 #define ETP_FINGER_WIDTH 15
47 #define ETP_RETRY_COUNT 3
48
49 /* The main device structure */
50 struct elan_tp_data {
51 struct i2c_client *client;
52 struct input_dev *input;
53 struct input_dev *tp_input; /* trackpoint input node */
54 struct regulator *vcc;
55
56 const struct elan_transport_ops *ops;
57
58 /* for fw update */
59 struct completion fw_completion;
60 bool in_fw_update;
61
62 struct mutex sysfs_mutex;
63
64 unsigned int max_x;
65 unsigned int max_y;
66 unsigned int width_x;
67 unsigned int width_y;
68 unsigned int x_res;
69 unsigned int y_res;
70
71 u8 pattern;
72 u16 product_id;
73 u8 fw_version;
74 u8 sm_version;
75 u8 iap_version;
76 u16 fw_checksum;
77 unsigned int report_features;
78 unsigned int report_len;
79 int pressure_adjustment;
80 u8 mode;
81 u16 ic_type;
82 u16 fw_validpage_count;
83 u16 fw_page_size;
84 u32 fw_signature_address;
85
86 bool irq_wake;
87
88 u8 min_baseline;
89 u8 max_baseline;
90 bool baseline_ready;
91 u8 clickpad;
92 bool middle_button;
93 };
94
95 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
96 u32 *signature_address, u16 *page_size)
97 {
98 switch (ic_type) {
99 case 0x00:
100 case 0x06:
101 case 0x08:
102 *validpage_count = 512;
103 break;
104 case 0x03:
105 case 0x07:
106 case 0x09:
107 case 0x0A:
108 case 0x0B:
109 case 0x0C:
110 *validpage_count = 768;
111 break;
112 case 0x0D:
113 *validpage_count = 896;
114 break;
115 case 0x0E:
116 *validpage_count = 640;
117 break;
118 case 0x10:
119 *validpage_count = 1024;
120 break;
121 case 0x11:
122 *validpage_count = 1280;
123 break;
124 case 0x13:
125 *validpage_count = 2048;
126 break;
127 case 0x14:
128 case 0x15:
129 *validpage_count = 1024;
130 break;
131 default:
132 /* unknown ic type clear value */
133 *validpage_count = 0;
134 *signature_address = 0;
135 *page_size = 0;
136 return -ENXIO;
137 }
138
139 *signature_address =
140 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
141
142 if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
143 *validpage_count /= 8;
144 *page_size = ETP_FW_PAGE_SIZE_512;
145 } else if (ic_type >= 0x0D && iap_version >= 1) {
146 *validpage_count /= 2;
147 *page_size = ETP_FW_PAGE_SIZE_128;
148 } else {
149 *page_size = ETP_FW_PAGE_SIZE;
150 }
151
152 return 0;
153 }
154
155 static int elan_enable_power(struct elan_tp_data *data)
156 {
157 int repeat = ETP_RETRY_COUNT;
158 int error;
159
160 error = regulator_enable(data->vcc);
161 if (error) {
162 dev_err(&data->client->dev,
163 "failed to enable regulator: %d\n", error);
164 return error;
165 }
166
167 do {
168 error = data->ops->power_control(data->client, true);
169 if (error >= 0)
170 return 0;
171
172 msleep(30);
173 } while (--repeat > 0);
174
175 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
176 return error;
177 }
178
179 static int elan_disable_power(struct elan_tp_data *data)
180 {
181 int repeat = ETP_RETRY_COUNT;
182 int error;
183
184 do {
185 error = data->ops->power_control(data->client, false);
186 if (!error) {
187 error = regulator_disable(data->vcc);
188 if (error) {
189 dev_err(&data->client->dev,
190 "failed to disable regulator: %d\n",
191 error);
192 /* Attempt to power the chip back up */
193 data->ops->power_control(data->client, true);
194 break;
195 }
196
197 return 0;
198 }
199
200 msleep(30);
201 } while (--repeat > 0);
202
203 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
204 return error;
205 }
206
207 static int elan_sleep(struct elan_tp_data *data)
208 {
209 int repeat = ETP_RETRY_COUNT;
210 int error;
211
212 do {
213 error = data->ops->sleep_control(data->client, true);
214 if (!error)
215 return 0;
216
217 msleep(30);
218 } while (--repeat > 0);
219
220 return error;
221 }
222
223 static int elan_query_product(struct elan_tp_data *data)
224 {
225 int error;
226
227 error = data->ops->get_product_id(data->client, &data->product_id);
228 if (error)
229 return error;
230
231 error = data->ops->get_pattern(data->client, &data->pattern);
232 if (error)
233 return error;
234
235 error = data->ops->get_sm_version(data->client, data->pattern,
236 &data->ic_type, &data->sm_version,
237 &data->clickpad);
238 if (error)
239 return error;
240
241 return 0;
242 }
243
244 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
245 {
246 if (data->ic_type == 0x0E) {
247 switch (data->product_id) {
248 case 0x05 ... 0x07:
249 case 0x09:
250 case 0x13:
251 return true;
252 }
253 } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
254 /* ASUS EeeBook X205TA */
255 return true;
256 }
257
258 return false;
259 }
260
261 static int __elan_initialize(struct elan_tp_data *data)
262 {
263 struct i2c_client *client = data->client;
264 bool woken_up = false;
265 int error;
266
267 error = data->ops->initialize(client);
268 if (error) {
269 dev_err(&client->dev, "device initialize failed: %d\n", error);
270 return error;
271 }
272
273 error = elan_query_product(data);
274 if (error)
275 return error;
276
277 /*
278 * Some ASUS devices were shipped with firmware that requires
279 * touchpads to be woken up first, before attempting to switch
280 * them into absolute reporting mode.
281 */
282 if (elan_check_ASUS_special_fw(data)) {
283 error = data->ops->sleep_control(client, false);
284 if (error) {
285 dev_err(&client->dev,
286 "failed to wake device up: %d\n", error);
287 return error;
288 }
289
290 msleep(200);
291 woken_up = true;
292 }
293
294 data->mode |= ETP_ENABLE_ABS;
295 error = data->ops->set_mode(client, data->mode);
296 if (error) {
297 dev_err(&client->dev,
298 "failed to switch to absolute mode: %d\n", error);
299 return error;
300 }
301
302 if (!woken_up) {
303 error = data->ops->sleep_control(client, false);
304 if (error) {
305 dev_err(&client->dev,
306 "failed to wake device up: %d\n", error);
307 return error;
308 }
309 }
310
311 return 0;
312 }
313
314 static int elan_initialize(struct elan_tp_data *data)
315 {
316 int repeat = ETP_RETRY_COUNT;
317 int error;
318
319 do {
320 error = __elan_initialize(data);
321 if (!error)
322 return 0;
323
324 msleep(30);
325 } while (--repeat > 0);
326
327 return error;
328 }
329
330 static int elan_query_device_info(struct elan_tp_data *data)
331 {
332 int error;
333
334 error = data->ops->get_version(data->client, data->pattern, false,
335 &data->fw_version);
336 if (error)
337 return error;
338
339 error = data->ops->get_checksum(data->client, false,
340 &data->fw_checksum);
341 if (error)
342 return error;
343
344 error = data->ops->get_version(data->client, data->pattern,
345 true, &data->iap_version);
346 if (error)
347 return error;
348
349 error = data->ops->get_pressure_adjustment(data->client,
350 &data->pressure_adjustment);
351 if (error)
352 return error;
353
354 error = data->ops->get_report_features(data->client, data->pattern,
355 &data->report_features,
356 &data->report_len);
357 if (error)
358 return error;
359
360 error = elan_get_fwinfo(data->ic_type, data->iap_version,
361 &data->fw_validpage_count,
362 &data->fw_signature_address,
363 &data->fw_page_size);
364 if (error)
365 dev_warn(&data->client->dev,
366 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
367 data->iap_version, data->ic_type);
368
369 return 0;
370 }
371
372 static unsigned int elan_convert_resolution(u8 val, u8 pattern)
373 {
374 /*
375 * pattern <= 0x01:
376 * (value from firmware) * 10 + 790 = dpi
377 * else
378 * ((value from firmware) + 3) * 100 = dpi
379 */
380 int res = pattern <= 0x01 ?
381 (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
382 /*
383 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
384 * point).
385 */
386 return res * 10 / 254;
387 }
388
389 static int elan_query_device_parameters(struct elan_tp_data *data)
390 {
391 struct i2c_client *client = data->client;
392 unsigned int x_traces, y_traces;
393 u32 x_mm, y_mm;
394 u8 hw_x_res, hw_y_res;
395 int error;
396
397 if (device_property_read_u32(&client->dev,
398 "touchscreen-size-x", &data->max_x) ||
399 device_property_read_u32(&client->dev,
400 "touchscreen-size-y", &data->max_y)) {
401 error = data->ops->get_max(data->client,
402 &data->max_x,
403 &data->max_y);
404 if (error)
405 return error;
406 } else {
407 /* size is the maximum + 1 */
408 --data->max_x;
409 --data->max_y;
410 }
411
412 if (device_property_read_u32(&client->dev,
413 "elan,x_traces",
414 &x_traces) ||
415 device_property_read_u32(&client->dev,
416 "elan,y_traces",
417 &y_traces)) {
418 error = data->ops->get_num_traces(data->client,
419 &x_traces, &y_traces);
420 if (error)
421 return error;
422 }
423 data->width_x = data->max_x / x_traces;
424 data->width_y = data->max_y / y_traces;
425
426 if (device_property_read_u32(&client->dev,
427 "touchscreen-x-mm", &x_mm) ||
428 device_property_read_u32(&client->dev,
429 "touchscreen-y-mm", &y_mm)) {
430 error = data->ops->get_resolution(data->client,
431 &hw_x_res, &hw_y_res);
432 if (error)
433 return error;
434
435 data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
436 data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
437 } else {
438 data->x_res = (data->max_x + 1) / x_mm;
439 data->y_res = (data->max_y + 1) / y_mm;
440 }
441
442 if (device_property_read_bool(&client->dev, "elan,clickpad"))
443 data->clickpad = 1;
444
445 if (device_property_read_bool(&client->dev, "elan,middle-button"))
446 data->middle_button = true;
447
448 return 0;
449 }
450
451 /*
452 **********************************************************
453 * IAP firmware updater related routines
454 **********************************************************
455 */
456 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
457 const u8 *page, u16 checksum, int idx)
458 {
459 int retry = ETP_RETRY_COUNT;
460 int error;
461
462 do {
463 error = data->ops->write_fw_block(data->client, page_size,
464 page, checksum, idx);
465 if (!error)
466 return 0;
467
468 dev_dbg(&data->client->dev,
469 "IAP retrying page %d (error: %d)\n", idx, error);
470 } while (--retry > 0);
471
472 return error;
473 }
474
475 static int __elan_update_firmware(struct elan_tp_data *data,
476 const struct firmware *fw)
477 {
478 struct i2c_client *client = data->client;
479 struct device *dev = &client->dev;
480 int i, j;
481 int error;
482 u16 iap_start_addr;
483 u16 boot_page_count;
484 u16 sw_checksum = 0, fw_checksum = 0;
485
486 error = data->ops->prepare_fw_update(client, data->ic_type,
487 data->iap_version,
488 data->fw_page_size);
489 if (error)
490 return error;
491
492 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
493
494 boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
495 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
496 u16 checksum = 0;
497 const u8 *page = &fw->data[i * data->fw_page_size];
498
499 for (j = 0; j < data->fw_page_size; j += 2)
500 checksum += ((page[j + 1] << 8) | page[j]);
501
502 error = elan_write_fw_block(data, data->fw_page_size,
503 page, checksum, i);
504 if (error) {
505 dev_err(dev, "write page %d fail: %d\n", i, error);
506 return error;
507 }
508
509 sw_checksum += checksum;
510 }
511
512 /* Wait WDT reset and power on reset */
513 msleep(600);
514
515 error = data->ops->finish_fw_update(client, &data->fw_completion);
516 if (error)
517 return error;
518
519 error = data->ops->get_checksum(client, true, &fw_checksum);
520 if (error)
521 return error;
522
523 if (sw_checksum != fw_checksum) {
524 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
525 sw_checksum, fw_checksum);
526 return -EIO;
527 }
528
529 return 0;
530 }
531
532 static int elan_update_firmware(struct elan_tp_data *data,
533 const struct firmware *fw)
534 {
535 struct i2c_client *client = data->client;
536 int retval;
537
538 dev_dbg(&client->dev, "Starting firmware update....\n");
539
540 disable_irq(client->irq);
541 data->in_fw_update = true;
542
543 retval = __elan_update_firmware(data, fw);
544 if (retval) {
545 dev_err(&client->dev, "firmware update failed: %d\n", retval);
546 data->ops->iap_reset(client);
547 } else {
548 /* Reinitialize TP after fw is updated */
549 elan_initialize(data);
550 elan_query_device_info(data);
551 }
552
553 data->in_fw_update = false;
554 enable_irq(client->irq);
555
556 return retval;
557 }
558
559 /*
560 *******************************************************************
561 * SYSFS attributes
562 *******************************************************************
563 */
564 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
565 struct device_attribute *attr,
566 char *buf)
567 {
568 struct i2c_client *client = to_i2c_client(dev);
569 struct elan_tp_data *data = i2c_get_clientdata(client);
570
571 return sprintf(buf, "0x%04x\n", data->fw_checksum);
572 }
573
574 static ssize_t elan_sysfs_read_product_id(struct device *dev,
575 struct device_attribute *attr,
576 char *buf)
577 {
578 struct i2c_client *client = to_i2c_client(dev);
579 struct elan_tp_data *data = i2c_get_clientdata(client);
580
581 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
582 data->product_id);
583 }
584
585 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
586 struct device_attribute *attr,
587 char *buf)
588 {
589 struct i2c_client *client = to_i2c_client(dev);
590 struct elan_tp_data *data = i2c_get_clientdata(client);
591
592 return sprintf(buf, "%d.0\n", data->fw_version);
593 }
594
595 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
596 struct device_attribute *attr,
597 char *buf)
598 {
599 struct i2c_client *client = to_i2c_client(dev);
600 struct elan_tp_data *data = i2c_get_clientdata(client);
601
602 return sprintf(buf, "%d.0\n", data->sm_version);
603 }
604
605 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
606 struct device_attribute *attr,
607 char *buf)
608 {
609 struct i2c_client *client = to_i2c_client(dev);
610 struct elan_tp_data *data = i2c_get_clientdata(client);
611
612 return sprintf(buf, "%d.0\n", data->iap_version);
613 }
614
615 static ssize_t elan_sysfs_update_fw(struct device *dev,
616 struct device_attribute *attr,
617 const char *buf, size_t count)
618 {
619 struct elan_tp_data *data = dev_get_drvdata(dev);
620 const struct firmware *fw;
621 char *fw_name;
622 int error;
623 const u8 *fw_signature;
624 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
625
626 if (data->fw_validpage_count == 0)
627 return -EINVAL;
628
629 /* Look for a firmware with the product id appended. */
630 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
631 if (!fw_name) {
632 dev_err(dev, "failed to allocate memory for firmware name\n");
633 return -ENOMEM;
634 }
635
636 dev_info(dev, "requesting fw '%s'\n", fw_name);
637 error = request_firmware(&fw, fw_name, dev);
638 kfree(fw_name);
639 if (error) {
640 dev_err(dev, "failed to request firmware: %d\n", error);
641 return error;
642 }
643
644 /* Firmware file must match signature data */
645 fw_signature = &fw->data[data->fw_signature_address];
646 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
647 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
648 (int)sizeof(signature), signature,
649 (int)sizeof(signature), fw_signature);
650 error = -EBADF;
651 goto out_release_fw;
652 }
653
654 error = mutex_lock_interruptible(&data->sysfs_mutex);
655 if (error)
656 goto out_release_fw;
657
658 error = elan_update_firmware(data, fw);
659
660 mutex_unlock(&data->sysfs_mutex);
661
662 out_release_fw:
663 release_firmware(fw);
664 return error ?: count;
665 }
666
667 static ssize_t calibrate_store(struct device *dev,
668 struct device_attribute *attr,
669 const char *buf, size_t count)
670 {
671 struct i2c_client *client = to_i2c_client(dev);
672 struct elan_tp_data *data = i2c_get_clientdata(client);
673 int tries = 20;
674 int retval;
675 int error;
676 u8 val[ETP_CALIBRATE_MAX_LEN];
677
678 retval = mutex_lock_interruptible(&data->sysfs_mutex);
679 if (retval)
680 return retval;
681
682 disable_irq(client->irq);
683
684 data->mode |= ETP_ENABLE_CALIBRATE;
685 retval = data->ops->set_mode(client, data->mode);
686 if (retval) {
687 dev_err(dev, "failed to enable calibration mode: %d\n",
688 retval);
689 goto out;
690 }
691
692 retval = data->ops->calibrate(client);
693 if (retval) {
694 dev_err(dev, "failed to start calibration: %d\n",
695 retval);
696 goto out_disable_calibrate;
697 }
698
699 val[0] = 0xff;
700 do {
701 /* Wait 250ms before checking if calibration has completed. */
702 msleep(250);
703
704 retval = data->ops->calibrate_result(client, val);
705 if (retval)
706 dev_err(dev, "failed to check calibration result: %d\n",
707 retval);
708 else if (val[0] == 0)
709 break; /* calibration done */
710
711 } while (--tries);
712
713 if (tries == 0) {
714 dev_err(dev, "failed to calibrate. Timeout.\n");
715 retval = -ETIMEDOUT;
716 }
717
718 out_disable_calibrate:
719 data->mode &= ~ETP_ENABLE_CALIBRATE;
720 error = data->ops->set_mode(data->client, data->mode);
721 if (error) {
722 dev_err(dev, "failed to disable calibration mode: %d\n",
723 error);
724 if (!retval)
725 retval = error;
726 }
727 out:
728 enable_irq(client->irq);
729 mutex_unlock(&data->sysfs_mutex);
730 return retval ?: count;
731 }
732
733 static ssize_t elan_sysfs_read_mode(struct device *dev,
734 struct device_attribute *attr,
735 char *buf)
736 {
737 struct i2c_client *client = to_i2c_client(dev);
738 struct elan_tp_data *data = i2c_get_clientdata(client);
739 int error;
740 enum tp_mode mode;
741
742 error = mutex_lock_interruptible(&data->sysfs_mutex);
743 if (error)
744 return error;
745
746 error = data->ops->iap_get_mode(data->client, &mode);
747
748 mutex_unlock(&data->sysfs_mutex);
749
750 if (error)
751 return error;
752
753 return sprintf(buf, "%d\n", (int)mode);
754 }
755
756 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
757 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
758 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
759 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
760 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
761 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
762 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
763
764 static DEVICE_ATTR_WO(calibrate);
765
766 static struct attribute *elan_sysfs_entries[] = {
767 &dev_attr_product_id.attr,
768 &dev_attr_firmware_version.attr,
769 &dev_attr_sample_version.attr,
770 &dev_attr_iap_version.attr,
771 &dev_attr_fw_checksum.attr,
772 &dev_attr_calibrate.attr,
773 &dev_attr_mode.attr,
774 &dev_attr_update_fw.attr,
775 NULL,
776 };
777
778 static const struct attribute_group elan_sysfs_group = {
779 .attrs = elan_sysfs_entries,
780 };
781
782 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
783 const char *buf, size_t count)
784 {
785 struct i2c_client *client = to_i2c_client(dev);
786 struct elan_tp_data *data = i2c_get_clientdata(client);
787 int error;
788 int retval;
789
790 retval = mutex_lock_interruptible(&data->sysfs_mutex);
791 if (retval)
792 return retval;
793
794 disable_irq(client->irq);
795
796 data->baseline_ready = false;
797
798 data->mode |= ETP_ENABLE_CALIBRATE;
799 retval = data->ops->set_mode(data->client, data->mode);
800 if (retval) {
801 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
802 retval);
803 goto out;
804 }
805
806 msleep(250);
807
808 retval = data->ops->get_baseline_data(data->client, true,
809 &data->max_baseline);
810 if (retval) {
811 dev_err(dev, "Failed to read max baseline form device: %d\n",
812 retval);
813 goto out_disable_calibrate;
814 }
815
816 retval = data->ops->get_baseline_data(data->client, false,
817 &data->min_baseline);
818 if (retval) {
819 dev_err(dev, "Failed to read min baseline form device: %d\n",
820 retval);
821 goto out_disable_calibrate;
822 }
823
824 data->baseline_ready = true;
825
826 out_disable_calibrate:
827 data->mode &= ~ETP_ENABLE_CALIBRATE;
828 error = data->ops->set_mode(data->client, data->mode);
829 if (error) {
830 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
831 error);
832 if (!retval)
833 retval = error;
834 }
835 out:
836 enable_irq(client->irq);
837 mutex_unlock(&data->sysfs_mutex);
838 return retval ?: count;
839 }
840
841 static ssize_t min_show(struct device *dev,
842 struct device_attribute *attr, char *buf)
843 {
844 struct i2c_client *client = to_i2c_client(dev);
845 struct elan_tp_data *data = i2c_get_clientdata(client);
846 int retval;
847
848 retval = mutex_lock_interruptible(&data->sysfs_mutex);
849 if (retval)
850 return retval;
851
852 if (!data->baseline_ready) {
853 retval = -ENODATA;
854 goto out;
855 }
856
857 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
858
859 out:
860 mutex_unlock(&data->sysfs_mutex);
861 return retval;
862 }
863
864 static ssize_t max_show(struct device *dev,
865 struct device_attribute *attr, char *buf)
866 {
867 struct i2c_client *client = to_i2c_client(dev);
868 struct elan_tp_data *data = i2c_get_clientdata(client);
869 int retval;
870
871 retval = mutex_lock_interruptible(&data->sysfs_mutex);
872 if (retval)
873 return retval;
874
875 if (!data->baseline_ready) {
876 retval = -ENODATA;
877 goto out;
878 }
879
880 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
881
882 out:
883 mutex_unlock(&data->sysfs_mutex);
884 return retval;
885 }
886
887
888 static DEVICE_ATTR_WO(acquire);
889 static DEVICE_ATTR_RO(min);
890 static DEVICE_ATTR_RO(max);
891
892 static struct attribute *elan_baseline_sysfs_entries[] = {
893 &dev_attr_acquire.attr,
894 &dev_attr_min.attr,
895 &dev_attr_max.attr,
896 NULL,
897 };
898
899 static const struct attribute_group elan_baseline_sysfs_group = {
900 .name = "baseline",
901 .attrs = elan_baseline_sysfs_entries,
902 };
903
904 static const struct attribute_group *elan_sysfs_groups[] = {
905 &elan_sysfs_group,
906 &elan_baseline_sysfs_group,
907 NULL
908 };
909
910 /*
911 ******************************************************************
912 * Elan isr functions
913 ******************************************************************
914 */
915 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
916 bool contact_valid, bool high_precision,
917 u8 *packet, u8 *finger_data)
918 {
919 struct input_dev *input = data->input;
920 unsigned int pos_x, pos_y;
921 unsigned int pressure, scaled_pressure;
922
923 if (contact_valid) {
924 if (high_precision) {
925 pos_x = get_unaligned_be16(&finger_data[0]);
926 pos_y = get_unaligned_be16(&finger_data[2]);
927 } else {
928 pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
929 pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
930 }
931
932 if (pos_x > data->max_x || pos_y > data->max_y) {
933 dev_dbg(input->dev.parent,
934 "[%d] x=%d y=%d over max (%d, %d)",
935 contact_num, pos_x, pos_y,
936 data->max_x, data->max_y);
937 return;
938 }
939
940 pressure = finger_data[4];
941 scaled_pressure = pressure + data->pressure_adjustment;
942 if (scaled_pressure > ETP_MAX_PRESSURE)
943 scaled_pressure = ETP_MAX_PRESSURE;
944
945 input_mt_slot(input, contact_num);
946 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
947 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
948 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
949 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
950
951 if (data->report_features & ETP_FEATURE_REPORT_MK) {
952 unsigned int mk_x, mk_y, area_x, area_y;
953 u8 mk_data = high_precision ?
954 packet[ETP_MK_DATA_OFFSET + contact_num] :
955 finger_data[3];
956
957 mk_x = mk_data & 0x0f;
958 mk_y = mk_data >> 4;
959
960 /*
961 * To avoid treating large finger as palm, let's reduce
962 * the width x and y per trace.
963 */
964 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
965 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
966
967 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
968 input_report_abs(input, ABS_MT_TOUCH_MAJOR,
969 max(area_x, area_y));
970 input_report_abs(input, ABS_MT_TOUCH_MINOR,
971 min(area_x, area_y));
972 }
973 } else {
974 input_mt_slot(input, contact_num);
975 input_mt_report_slot_inactive(input);
976 }
977 }
978
979 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
980 bool high_precision)
981 {
982 struct input_dev *input = data->input;
983 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
984 int i;
985 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
986 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
987 bool contact_valid, hover_event;
988
989 pm_wakeup_event(&data->client->dev, 0);
990
991 hover_event = hover_info & BIT(6);
992
993 for (i = 0; i < ETP_MAX_FINGERS; i++) {
994 contact_valid = tp_info & BIT(3 + i);
995 elan_report_contact(data, i, contact_valid, high_precision,
996 packet, finger_data);
997 if (contact_valid)
998 finger_data += ETP_FINGER_DATA_LEN;
999 }
1000
1001 input_report_key(input, BTN_LEFT, tp_info & BIT(0));
1002 input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1003 input_report_key(input, BTN_RIGHT, tp_info & BIT(1));
1004 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1005 input_mt_report_pointer_emulation(input, true);
1006 input_sync(input);
1007 }
1008
1009 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1010 {
1011 struct input_dev *input = data->tp_input;
1012 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1013 int x, y;
1014
1015 pm_wakeup_event(&data->client->dev, 0);
1016
1017 if (!data->tp_input) {
1018 dev_warn_once(&data->client->dev,
1019 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1020 return;
1021 }
1022
1023 input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1024 input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1025 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1026
1027 if ((packet[3] & 0x0F) == 0x06) {
1028 x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1029 y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1030
1031 input_report_rel(input, REL_X, x);
1032 input_report_rel(input, REL_Y, y);
1033 }
1034
1035 input_sync(input);
1036 }
1037
1038 static irqreturn_t elan_isr(int irq, void *dev_id)
1039 {
1040 struct elan_tp_data *data = dev_id;
1041 int error;
1042 u8 report[ETP_MAX_REPORT_LEN];
1043
1044 /*
1045 * When device is connected to i2c bus, when all IAP page writes
1046 * complete, the driver will receive interrupt and must read
1047 * 0000 to confirm that IAP is finished.
1048 */
1049 if (data->in_fw_update) {
1050 complete(&data->fw_completion);
1051 goto out;
1052 }
1053
1054 error = data->ops->get_report(data->client, report, data->report_len);
1055 if (error)
1056 goto out;
1057
1058 switch (report[ETP_REPORT_ID_OFFSET]) {
1059 case ETP_REPORT_ID:
1060 elan_report_absolute(data, report, false);
1061 break;
1062 case ETP_REPORT_ID2:
1063 elan_report_absolute(data, report, true);
1064 break;
1065 case ETP_TP_REPORT_ID:
1066 case ETP_TP_REPORT_ID2:
1067 elan_report_trackpoint(data, report);
1068 break;
1069 default:
1070 dev_err(&data->client->dev, "invalid report id data (%x)\n",
1071 report[ETP_REPORT_ID_OFFSET]);
1072 }
1073
1074 out:
1075 return IRQ_HANDLED;
1076 }
1077
1078 /*
1079 ******************************************************************
1080 * Elan initialization functions
1081 ******************************************************************
1082 */
1083
1084 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1085 {
1086 struct device *dev = &data->client->dev;
1087 struct input_dev *input;
1088
1089 input = devm_input_allocate_device(dev);
1090 if (!input)
1091 return -ENOMEM;
1092
1093 input->name = "Elan TrackPoint";
1094 input->id.bustype = BUS_I2C;
1095 input->id.vendor = ELAN_VENDOR_ID;
1096 input->id.product = data->product_id;
1097 input_set_drvdata(input, data);
1098
1099 input_set_capability(input, EV_REL, REL_X);
1100 input_set_capability(input, EV_REL, REL_Y);
1101 input_set_capability(input, EV_KEY, BTN_LEFT);
1102 input_set_capability(input, EV_KEY, BTN_RIGHT);
1103 input_set_capability(input, EV_KEY, BTN_MIDDLE);
1104
1105 __set_bit(INPUT_PROP_POINTER, input->propbit);
1106 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1107
1108 data->tp_input = input;
1109
1110 return 0;
1111 }
1112
1113 static int elan_setup_input_device(struct elan_tp_data *data)
1114 {
1115 struct device *dev = &data->client->dev;
1116 struct input_dev *input;
1117 unsigned int max_width = max(data->width_x, data->width_y);
1118 unsigned int min_width = min(data->width_x, data->width_y);
1119 int error;
1120
1121 input = devm_input_allocate_device(dev);
1122 if (!input)
1123 return -ENOMEM;
1124
1125 input->name = "Elan Touchpad";
1126 input->id.bustype = BUS_I2C;
1127 input->id.vendor = ELAN_VENDOR_ID;
1128 input->id.product = data->product_id;
1129 input_set_drvdata(input, data);
1130
1131 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1132 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1133 if (error) {
1134 dev_err(dev, "failed to initialize MT slots: %d\n", error);
1135 return error;
1136 }
1137
1138 __set_bit(EV_ABS, input->evbit);
1139 __set_bit(INPUT_PROP_POINTER, input->propbit);
1140 if (data->clickpad) {
1141 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1142 } else {
1143 __set_bit(BTN_RIGHT, input->keybit);
1144 if (data->middle_button)
1145 __set_bit(BTN_MIDDLE, input->keybit);
1146 }
1147 __set_bit(BTN_LEFT, input->keybit);
1148
1149 /* Set up ST parameters */
1150 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1151 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1152 input_abs_set_res(input, ABS_X, data->x_res);
1153 input_abs_set_res(input, ABS_Y, data->y_res);
1154 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1155 if (data->report_features & ETP_FEATURE_REPORT_MK)
1156 input_set_abs_params(input, ABS_TOOL_WIDTH,
1157 0, ETP_FINGER_WIDTH, 0, 0);
1158 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1159
1160 /* And MT parameters */
1161 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1162 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1163 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1164 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1165 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1166 ETP_MAX_PRESSURE, 0, 0);
1167 if (data->report_features & ETP_FEATURE_REPORT_MK) {
1168 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1169 0, ETP_FINGER_WIDTH * max_width, 0, 0);
1170 input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1171 0, ETP_FINGER_WIDTH * min_width, 0, 0);
1172 }
1173
1174 data->input = input;
1175
1176 return 0;
1177 }
1178
1179 static void elan_disable_regulator(void *_data)
1180 {
1181 struct elan_tp_data *data = _data;
1182
1183 regulator_disable(data->vcc);
1184 }
1185
1186 static int elan_probe(struct i2c_client *client,
1187 const struct i2c_device_id *dev_id)
1188 {
1189 const struct elan_transport_ops *transport_ops;
1190 struct device *dev = &client->dev;
1191 struct elan_tp_data *data;
1192 unsigned long irqflags;
1193 int error;
1194
1195 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1196 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1197 transport_ops = &elan_i2c_ops;
1198 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1199 i2c_check_functionality(client->adapter,
1200 I2C_FUNC_SMBUS_BYTE_DATA |
1201 I2C_FUNC_SMBUS_BLOCK_DATA |
1202 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1203 transport_ops = &elan_smbus_ops;
1204 } else {
1205 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1206 return -EIO;
1207 }
1208
1209 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1210 if (!data)
1211 return -ENOMEM;
1212
1213 i2c_set_clientdata(client, data);
1214
1215 data->ops = transport_ops;
1216 data->client = client;
1217 init_completion(&data->fw_completion);
1218 mutex_init(&data->sysfs_mutex);
1219
1220 data->vcc = devm_regulator_get(dev, "vcc");
1221 if (IS_ERR(data->vcc)) {
1222 error = PTR_ERR(data->vcc);
1223 if (error != -EPROBE_DEFER)
1224 dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1225 error);
1226 return error;
1227 }
1228
1229 error = regulator_enable(data->vcc);
1230 if (error) {
1231 dev_err(dev, "Failed to enable regulator: %d\n", error);
1232 return error;
1233 }
1234
1235 error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1236 if (error) {
1237 dev_err(dev, "Failed to add disable regulator action: %d\n",
1238 error);
1239 return error;
1240 }
1241
1242 /* Make sure there is something at this address */
1243 error = i2c_smbus_read_byte(client);
1244 if (error < 0) {
1245 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1246 return -ENXIO;
1247 }
1248
1249 /* Initialize the touchpad. */
1250 error = elan_initialize(data);
1251 if (error)
1252 return error;
1253
1254 error = elan_query_device_info(data);
1255 if (error)
1256 return error;
1257
1258 error = elan_query_device_parameters(data);
1259 if (error)
1260 return error;
1261
1262 dev_info(dev,
1263 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1264 data->product_id,
1265 data->fw_version,
1266 data->sm_version,
1267 data->iap_version);
1268
1269 dev_dbg(dev,
1270 "Elan Touchpad Extra Information:\n"
1271 " Max ABS X,Y: %d,%d\n"
1272 " Width X,Y: %d,%d\n"
1273 " Resolution X,Y: %d,%d (dots/mm)\n"
1274 " ic type: 0x%x\n"
1275 " info pattern: 0x%x\n",
1276 data->max_x, data->max_y,
1277 data->width_x, data->width_y,
1278 data->x_res, data->y_res,
1279 data->ic_type, data->pattern);
1280
1281 /* Set up input device properties based on queried parameters. */
1282 error = elan_setup_input_device(data);
1283 if (error)
1284 return error;
1285
1286 if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1287 error = elan_setup_trackpoint_input_device(data);
1288 if (error)
1289 return error;
1290 }
1291
1292 /*
1293 * Platform code (ACPI, DTS) should normally set up interrupt
1294 * for us, but in case it did not let's fall back to using falling
1295 * edge to be compatible with older Chromebooks.
1296 */
1297 irqflags = irq_get_trigger_type(client->irq);
1298 if (!irqflags)
1299 irqflags = IRQF_TRIGGER_FALLING;
1300
1301 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1302 irqflags | IRQF_ONESHOT,
1303 client->name, data);
1304 if (error) {
1305 dev_err(dev, "cannot register irq=%d\n", client->irq);
1306 return error;
1307 }
1308
1309 error = devm_device_add_groups(dev, elan_sysfs_groups);
1310 if (error) {
1311 dev_err(dev, "failed to create sysfs attributes: %d\n", error);
1312 return error;
1313 }
1314
1315 error = input_register_device(data->input);
1316 if (error) {
1317 dev_err(dev, "failed to register input device: %d\n", error);
1318 return error;
1319 }
1320
1321 if (data->tp_input) {
1322 error = input_register_device(data->tp_input);
1323 if (error) {
1324 dev_err(&client->dev,
1325 "failed to register TrackPoint input device: %d\n",
1326 error);
1327 return error;
1328 }
1329 }
1330
1331 /*
1332 * Systems using device tree should set up wakeup via DTS,
1333 * the rest will configure device as wakeup source by default.
1334 */
1335 if (!dev->of_node)
1336 device_init_wakeup(dev, true);
1337
1338 return 0;
1339 }
1340
1341 static int __maybe_unused elan_suspend(struct device *dev)
1342 {
1343 struct i2c_client *client = to_i2c_client(dev);
1344 struct elan_tp_data *data = i2c_get_clientdata(client);
1345 int ret;
1346
1347 /*
1348 * We are taking the mutex to make sure sysfs operations are
1349 * complete before we attempt to bring the device into low[er]
1350 * power mode.
1351 */
1352 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1353 if (ret)
1354 return ret;
1355
1356 disable_irq(client->irq);
1357
1358 if (device_may_wakeup(dev)) {
1359 ret = elan_sleep(data);
1360 /* Enable wake from IRQ */
1361 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1362 } else {
1363 ret = elan_disable_power(data);
1364 }
1365
1366 mutex_unlock(&data->sysfs_mutex);
1367 return ret;
1368 }
1369
1370 static int __maybe_unused elan_resume(struct device *dev)
1371 {
1372 struct i2c_client *client = to_i2c_client(dev);
1373 struct elan_tp_data *data = i2c_get_clientdata(client);
1374 int error;
1375
1376 if (device_may_wakeup(dev) && data->irq_wake) {
1377 disable_irq_wake(client->irq);
1378 data->irq_wake = false;
1379 }
1380
1381 error = elan_enable_power(data);
1382 if (error) {
1383 dev_err(dev, "power up when resuming failed: %d\n", error);
1384 goto err;
1385 }
1386
1387 error = elan_initialize(data);
1388 if (error)
1389 dev_err(dev, "initialize when resuming failed: %d\n", error);
1390
1391 err:
1392 enable_irq(data->client->irq);
1393 return error;
1394 }
1395
1396 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1397
1398 static const struct i2c_device_id elan_id[] = {
1399 { DRIVER_NAME, 0 },
1400 { },
1401 };
1402 MODULE_DEVICE_TABLE(i2c, elan_id);
1403
1404 #ifdef CONFIG_ACPI
1405 #include <linux/input/elan-i2c-ids.h>
1406 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1407 #endif
1408
1409 #ifdef CONFIG_OF
1410 static const struct of_device_id elan_of_match[] = {
1411 { .compatible = "elan,ekth3000" },
1412 { /* sentinel */ }
1413 };
1414 MODULE_DEVICE_TABLE(of, elan_of_match);
1415 #endif
1416
1417 static struct i2c_driver elan_driver = {
1418 .driver = {
1419 .name = DRIVER_NAME,
1420 .pm = &elan_pm_ops,
1421 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1422 .of_match_table = of_match_ptr(elan_of_match),
1423 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1424 },
1425 .probe = elan_probe,
1426 .id_table = elan_id,
1427 };
1428
1429 module_i2c_driver(elan_driver);
1430
1431 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1432 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1433 MODULE_LICENSE("GPL");
Linux with added FPC-III support