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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / input / mouse / elan_i2c_core.c
1 /*
2 * Elan I2C/SMBus Touchpad driver
3 *
4 * Copyright (c) 2013 ELAN Microelectronics Corp.
5 *
6 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
7 * Author: KT Liao <kt.liao@emc.com.tw>
8 * Version: 1.6.2
9 *
10 * Based on cyapa driver:
11 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
12 * copyright (c) 2011-2012 Google, Inc.
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License version 2 as published
16 * by the Free Software Foundation.
17 *
18 * Trademarks are the property of their respective owners.
19 */
20
21 #include <linux/acpi.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/firmware.h>
25 #include <linux/i2c.h>
26 #include <linux/init.h>
27 #include <linux/input/mt.h>
28 #include <linux/interrupt.h>
29 #include <linux/module.h>
30 #include <linux/slab.h>
31 #include <linux/kernel.h>
32 #include <linux/sched.h>
33 #include <linux/input.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <linux/completion.h>
37 #include <linux/of.h>
38 #include <linux/regulator/consumer.h>
39 #include <asm/unaligned.h>
40
41 #include "elan_i2c.h"
42
43 #define DRIVER_NAME "elan_i2c"
44 #define ELAN_DRIVER_VERSION "1.6.2"
45 #define ELAN_VENDOR_ID 0x04f3
46 #define ETP_MAX_PRESSURE 255
47 #define ETP_FWIDTH_REDUCE 90
48 #define ETP_FINGER_WIDTH 15
49 #define ETP_RETRY_COUNT 3
50
51 #define ETP_MAX_FINGERS 5
52 #define ETP_FINGER_DATA_LEN 5
53 #define ETP_REPORT_ID 0x5D
54 #define ETP_REPORT_ID_OFFSET 2
55 #define ETP_TOUCH_INFO_OFFSET 3
56 #define ETP_FINGER_DATA_OFFSET 4
57 #define ETP_HOVER_INFO_OFFSET 30
58 #define ETP_MAX_REPORT_LEN 34
59
60 /* The main device structure */
61 struct elan_tp_data {
62 struct i2c_client *client;
63 struct input_dev *input;
64 struct regulator *vcc;
65
66 const struct elan_transport_ops *ops;
67
68 /* for fw update */
69 struct completion fw_completion;
70 bool in_fw_update;
71
72 struct mutex sysfs_mutex;
73
74 unsigned int max_x;
75 unsigned int max_y;
76 unsigned int width_x;
77 unsigned int width_y;
78 unsigned int x_res;
79 unsigned int y_res;
80
81 u16 product_id;
82 u8 fw_version;
83 u8 sm_version;
84 u8 iap_version;
85 u16 fw_checksum;
86 int pressure_adjustment;
87 u8 mode;
88 u8 ic_type;
89 u16 fw_validpage_count;
90 u16 fw_signature_address;
91
92 bool irq_wake;
93
94 u8 min_baseline;
95 u8 max_baseline;
96 bool baseline_ready;
97 };
98
99 static int elan_get_fwinfo(u8 iap_version, u16 *validpage_count,
100 u16 *signature_address)
101 {
102 switch (iap_version) {
103 case 0x00:
104 case 0x06:
105 case 0x08:
106 *validpage_count = 512;
107 break;
108 case 0x03:
109 case 0x07:
110 case 0x09:
111 case 0x0A:
112 case 0x0B:
113 case 0x0C:
114 *validpage_count = 768;
115 break;
116 case 0x0D:
117 *validpage_count = 896;
118 break;
119 case 0x0E:
120 *validpage_count = 640;
121 break;
122 default:
123 /* unknown ic type clear value */
124 *validpage_count = 0;
125 *signature_address = 0;
126 return -ENXIO;
127 }
128
129 *signature_address =
130 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
131
132 return 0;
133 }
134
135 static int elan_enable_power(struct elan_tp_data *data)
136 {
137 int repeat = ETP_RETRY_COUNT;
138 int error;
139
140 error = regulator_enable(data->vcc);
141 if (error) {
142 dev_err(&data->client->dev,
143 "failed to enable regulator: %d\n", error);
144 return error;
145 }
146
147 do {
148 error = data->ops->power_control(data->client, true);
149 if (error >= 0)
150 return 0;
151
152 msleep(30);
153 } while (--repeat > 0);
154
155 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
156 return error;
157 }
158
159 static int elan_disable_power(struct elan_tp_data *data)
160 {
161 int repeat = ETP_RETRY_COUNT;
162 int error;
163
164 do {
165 error = data->ops->power_control(data->client, false);
166 if (!error) {
167 error = regulator_disable(data->vcc);
168 if (error) {
169 dev_err(&data->client->dev,
170 "failed to disable regulator: %d\n",
171 error);
172 /* Attempt to power the chip back up */
173 data->ops->power_control(data->client, true);
174 break;
175 }
176
177 return 0;
178 }
179
180 msleep(30);
181 } while (--repeat > 0);
182
183 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
184 return error;
185 }
186
187 static int elan_sleep(struct elan_tp_data *data)
188 {
189 int repeat = ETP_RETRY_COUNT;
190 int error;
191
192 do {
193 error = data->ops->sleep_control(data->client, true);
194 if (!error)
195 return 0;
196
197 msleep(30);
198 } while (--repeat > 0);
199
200 return error;
201 }
202
203 static int elan_query_product(struct elan_tp_data *data)
204 {
205 int error;
206
207 error = data->ops->get_product_id(data->client, &data->product_id);
208 if (error)
209 return error;
210
211 error = data->ops->get_sm_version(data->client, &data->ic_type,
212 &data->sm_version);
213 if (error)
214 return error;
215
216 return 0;
217 }
218
219 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
220 {
221 if (data->ic_type == 0x0E) {
222 switch (data->product_id) {
223 case 0x05 ... 0x07:
224 case 0x09:
225 case 0x13:
226 return true;
227 }
228 } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
229 /* ASUS EeeBook X205TA */
230 return true;
231 }
232
233 return false;
234 }
235
236 static int __elan_initialize(struct elan_tp_data *data)
237 {
238 struct i2c_client *client = data->client;
239 bool woken_up = false;
240 int error;
241
242 error = data->ops->initialize(client);
243 if (error) {
244 dev_err(&client->dev, "device initialize failed: %d\n", error);
245 return error;
246 }
247
248 error = elan_query_product(data);
249 if (error)
250 return error;
251
252 /*
253 * Some ASUS devices were shipped with firmware that requires
254 * touchpads to be woken up first, before attempting to switch
255 * them into absolute reporting mode.
256 */
257 if (elan_check_ASUS_special_fw(data)) {
258 error = data->ops->sleep_control(client, false);
259 if (error) {
260 dev_err(&client->dev,
261 "failed to wake device up: %d\n", error);
262 return error;
263 }
264
265 msleep(200);
266 woken_up = true;
267 }
268
269 data->mode |= ETP_ENABLE_ABS;
270 error = data->ops->set_mode(client, data->mode);
271 if (error) {
272 dev_err(&client->dev,
273 "failed to switch to absolute mode: %d\n", error);
274 return error;
275 }
276
277 if (!woken_up) {
278 error = data->ops->sleep_control(client, false);
279 if (error) {
280 dev_err(&client->dev,
281 "failed to wake device up: %d\n", error);
282 return error;
283 }
284 }
285
286 return 0;
287 }
288
289 static int elan_initialize(struct elan_tp_data *data)
290 {
291 int repeat = ETP_RETRY_COUNT;
292 int error;
293
294 do {
295 error = __elan_initialize(data);
296 if (!error)
297 return 0;
298
299 msleep(30);
300 } while (--repeat > 0);
301
302 return error;
303 }
304
305 static int elan_query_device_info(struct elan_tp_data *data)
306 {
307 int error;
308
309 error = data->ops->get_version(data->client, false, &data->fw_version);
310 if (error)
311 return error;
312
313 error = data->ops->get_checksum(data->client, false,
314 &data->fw_checksum);
315 if (error)
316 return error;
317
318 error = data->ops->get_version(data->client, true, &data->iap_version);
319 if (error)
320 return error;
321
322 error = data->ops->get_pressure_adjustment(data->client,
323 &data->pressure_adjustment);
324 if (error)
325 return error;
326
327 error = elan_get_fwinfo(data->iap_version, &data->fw_validpage_count,
328 &data->fw_signature_address);
329 if (error)
330 dev_warn(&data->client->dev,
331 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
332 data->iap_version, data->ic_type);
333
334 return 0;
335 }
336
337 static unsigned int elan_convert_resolution(u8 val)
338 {
339 /*
340 * (value from firmware) * 10 + 790 = dpi
341 *
342 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
343 * point).
344 */
345
346 return ((int)(char)val * 10 + 790) * 10 / 254;
347 }
348
349 static int elan_query_device_parameters(struct elan_tp_data *data)
350 {
351 unsigned int x_traces, y_traces;
352 u8 hw_x_res, hw_y_res;
353 int error;
354
355 error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
356 if (error)
357 return error;
358
359 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
360 if (error)
361 return error;
362
363 data->width_x = data->max_x / x_traces;
364 data->width_y = data->max_y / y_traces;
365
366 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
367 if (error)
368 return error;
369
370 data->x_res = elan_convert_resolution(hw_x_res);
371 data->y_res = elan_convert_resolution(hw_y_res);
372
373 return 0;
374 }
375
376 /*
377 **********************************************************
378 * IAP firmware updater related routines
379 **********************************************************
380 */
381 static int elan_write_fw_block(struct elan_tp_data *data,
382 const u8 *page, u16 checksum, int idx)
383 {
384 int retry = ETP_RETRY_COUNT;
385 int error;
386
387 do {
388 error = data->ops->write_fw_block(data->client,
389 page, checksum, idx);
390 if (!error)
391 return 0;
392
393 dev_dbg(&data->client->dev,
394 "IAP retrying page %d (error: %d)\n", idx, error);
395 } while (--retry > 0);
396
397 return error;
398 }
399
400 static int __elan_update_firmware(struct elan_tp_data *data,
401 const struct firmware *fw)
402 {
403 struct i2c_client *client = data->client;
404 struct device *dev = &client->dev;
405 int i, j;
406 int error;
407 u16 iap_start_addr;
408 u16 boot_page_count;
409 u16 sw_checksum = 0, fw_checksum = 0;
410
411 error = data->ops->prepare_fw_update(client);
412 if (error)
413 return error;
414
415 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
416
417 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
418 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
419 u16 checksum = 0;
420 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
421
422 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
423 checksum += ((page[j + 1] << 8) | page[j]);
424
425 error = elan_write_fw_block(data, page, checksum, i);
426 if (error) {
427 dev_err(dev, "write page %d fail: %d\n", i, error);
428 return error;
429 }
430
431 sw_checksum += checksum;
432 }
433
434 /* Wait WDT reset and power on reset */
435 msleep(600);
436
437 error = data->ops->finish_fw_update(client, &data->fw_completion);
438 if (error)
439 return error;
440
441 error = data->ops->get_checksum(client, true, &fw_checksum);
442 if (error)
443 return error;
444
445 if (sw_checksum != fw_checksum) {
446 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
447 sw_checksum, fw_checksum);
448 return -EIO;
449 }
450
451 return 0;
452 }
453
454 static int elan_update_firmware(struct elan_tp_data *data,
455 const struct firmware *fw)
456 {
457 struct i2c_client *client = data->client;
458 int retval;
459
460 dev_dbg(&client->dev, "Starting firmware update....\n");
461
462 disable_irq(client->irq);
463 data->in_fw_update = true;
464
465 retval = __elan_update_firmware(data, fw);
466 if (retval) {
467 dev_err(&client->dev, "firmware update failed: %d\n", retval);
468 data->ops->iap_reset(client);
469 } else {
470 /* Reinitialize TP after fw is updated */
471 elan_initialize(data);
472 elan_query_device_info(data);
473 }
474
475 data->in_fw_update = false;
476 enable_irq(client->irq);
477
478 return retval;
479 }
480
481 /*
482 *******************************************************************
483 * SYSFS attributes
484 *******************************************************************
485 */
486 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
487 struct device_attribute *attr,
488 char *buf)
489 {
490 struct i2c_client *client = to_i2c_client(dev);
491 struct elan_tp_data *data = i2c_get_clientdata(client);
492
493 return sprintf(buf, "0x%04x\n", data->fw_checksum);
494 }
495
496 static ssize_t elan_sysfs_read_product_id(struct device *dev,
497 struct device_attribute *attr,
498 char *buf)
499 {
500 struct i2c_client *client = to_i2c_client(dev);
501 struct elan_tp_data *data = i2c_get_clientdata(client);
502
503 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
504 data->product_id);
505 }
506
507 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
508 struct device_attribute *attr,
509 char *buf)
510 {
511 struct i2c_client *client = to_i2c_client(dev);
512 struct elan_tp_data *data = i2c_get_clientdata(client);
513
514 return sprintf(buf, "%d.0\n", data->fw_version);
515 }
516
517 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
518 struct device_attribute *attr,
519 char *buf)
520 {
521 struct i2c_client *client = to_i2c_client(dev);
522 struct elan_tp_data *data = i2c_get_clientdata(client);
523
524 return sprintf(buf, "%d.0\n", data->sm_version);
525 }
526
527 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
528 struct device_attribute *attr,
529 char *buf)
530 {
531 struct i2c_client *client = to_i2c_client(dev);
532 struct elan_tp_data *data = i2c_get_clientdata(client);
533
534 return sprintf(buf, "%d.0\n", data->iap_version);
535 }
536
537 static ssize_t elan_sysfs_update_fw(struct device *dev,
538 struct device_attribute *attr,
539 const char *buf, size_t count)
540 {
541 struct elan_tp_data *data = dev_get_drvdata(dev);
542 const struct firmware *fw;
543 char *fw_name;
544 int error;
545 const u8 *fw_signature;
546 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
547
548 if (data->fw_validpage_count == 0)
549 return -EINVAL;
550
551 /* Look for a firmware with the product id appended. */
552 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
553 if (!fw_name) {
554 dev_err(dev, "failed to allocate memory for firmware name\n");
555 return -ENOMEM;
556 }
557
558 dev_info(dev, "requesting fw '%s'\n", fw_name);
559 error = request_firmware(&fw, fw_name, dev);
560 kfree(fw_name);
561 if (error) {
562 dev_err(dev, "failed to request firmware: %d\n", error);
563 return error;
564 }
565
566 /* Firmware file must match signature data */
567 fw_signature = &fw->data[data->fw_signature_address];
568 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
569 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
570 (int)sizeof(signature), signature,
571 (int)sizeof(signature), fw_signature);
572 error = -EBADF;
573 goto out_release_fw;
574 }
575
576 error = mutex_lock_interruptible(&data->sysfs_mutex);
577 if (error)
578 goto out_release_fw;
579
580 error = elan_update_firmware(data, fw);
581
582 mutex_unlock(&data->sysfs_mutex);
583
584 out_release_fw:
585 release_firmware(fw);
586 return error ?: count;
587 }
588
589 static ssize_t calibrate_store(struct device *dev,
590 struct device_attribute *attr,
591 const char *buf, size_t count)
592 {
593 struct i2c_client *client = to_i2c_client(dev);
594 struct elan_tp_data *data = i2c_get_clientdata(client);
595 int tries = 20;
596 int retval;
597 int error;
598 u8 val[3];
599
600 retval = mutex_lock_interruptible(&data->sysfs_mutex);
601 if (retval)
602 return retval;
603
604 disable_irq(client->irq);
605
606 data->mode |= ETP_ENABLE_CALIBRATE;
607 retval = data->ops->set_mode(client, data->mode);
608 if (retval) {
609 dev_err(dev, "failed to enable calibration mode: %d\n",
610 retval);
611 goto out;
612 }
613
614 retval = data->ops->calibrate(client);
615 if (retval) {
616 dev_err(dev, "failed to start calibration: %d\n",
617 retval);
618 goto out_disable_calibrate;
619 }
620
621 val[0] = 0xff;
622 do {
623 /* Wait 250ms before checking if calibration has completed. */
624 msleep(250);
625
626 retval = data->ops->calibrate_result(client, val);
627 if (retval)
628 dev_err(dev, "failed to check calibration result: %d\n",
629 retval);
630 else if (val[0] == 0)
631 break; /* calibration done */
632
633 } while (--tries);
634
635 if (tries == 0) {
636 dev_err(dev, "failed to calibrate. Timeout.\n");
637 retval = -ETIMEDOUT;
638 }
639
640 out_disable_calibrate:
641 data->mode &= ~ETP_ENABLE_CALIBRATE;
642 error = data->ops->set_mode(data->client, data->mode);
643 if (error) {
644 dev_err(dev, "failed to disable calibration mode: %d\n",
645 error);
646 if (!retval)
647 retval = error;
648 }
649 out:
650 enable_irq(client->irq);
651 mutex_unlock(&data->sysfs_mutex);
652 return retval ?: count;
653 }
654
655 static ssize_t elan_sysfs_read_mode(struct device *dev,
656 struct device_attribute *attr,
657 char *buf)
658 {
659 struct i2c_client *client = to_i2c_client(dev);
660 struct elan_tp_data *data = i2c_get_clientdata(client);
661 int error;
662 enum tp_mode mode;
663
664 error = mutex_lock_interruptible(&data->sysfs_mutex);
665 if (error)
666 return error;
667
668 error = data->ops->iap_get_mode(data->client, &mode);
669
670 mutex_unlock(&data->sysfs_mutex);
671
672 if (error)
673 return error;
674
675 return sprintf(buf, "%d\n", (int)mode);
676 }
677
678 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
679 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
680 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
681 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
682 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
683 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
684 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
685
686 static DEVICE_ATTR_WO(calibrate);
687
688 static struct attribute *elan_sysfs_entries[] = {
689 &dev_attr_product_id.attr,
690 &dev_attr_firmware_version.attr,
691 &dev_attr_sample_version.attr,
692 &dev_attr_iap_version.attr,
693 &dev_attr_fw_checksum.attr,
694 &dev_attr_calibrate.attr,
695 &dev_attr_mode.attr,
696 &dev_attr_update_fw.attr,
697 NULL,
698 };
699
700 static const struct attribute_group elan_sysfs_group = {
701 .attrs = elan_sysfs_entries,
702 };
703
704 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
705 const char *buf, size_t count)
706 {
707 struct i2c_client *client = to_i2c_client(dev);
708 struct elan_tp_data *data = i2c_get_clientdata(client);
709 int error;
710 int retval;
711
712 retval = mutex_lock_interruptible(&data->sysfs_mutex);
713 if (retval)
714 return retval;
715
716 disable_irq(client->irq);
717
718 data->baseline_ready = false;
719
720 data->mode |= ETP_ENABLE_CALIBRATE;
721 retval = data->ops->set_mode(data->client, data->mode);
722 if (retval) {
723 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
724 retval);
725 goto out;
726 }
727
728 msleep(250);
729
730 retval = data->ops->get_baseline_data(data->client, true,
731 &data->max_baseline);
732 if (retval) {
733 dev_err(dev, "Failed to read max baseline form device: %d\n",
734 retval);
735 goto out_disable_calibrate;
736 }
737
738 retval = data->ops->get_baseline_data(data->client, false,
739 &data->min_baseline);
740 if (retval) {
741 dev_err(dev, "Failed to read min baseline form device: %d\n",
742 retval);
743 goto out_disable_calibrate;
744 }
745
746 data->baseline_ready = true;
747
748 out_disable_calibrate:
749 data->mode &= ~ETP_ENABLE_CALIBRATE;
750 error = data->ops->set_mode(data->client, data->mode);
751 if (error) {
752 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
753 error);
754 if (!retval)
755 retval = error;
756 }
757 out:
758 enable_irq(client->irq);
759 mutex_unlock(&data->sysfs_mutex);
760 return retval ?: count;
761 }
762
763 static ssize_t min_show(struct device *dev,
764 struct device_attribute *attr, char *buf)
765 {
766 struct i2c_client *client = to_i2c_client(dev);
767 struct elan_tp_data *data = i2c_get_clientdata(client);
768 int retval;
769
770 retval = mutex_lock_interruptible(&data->sysfs_mutex);
771 if (retval)
772 return retval;
773
774 if (!data->baseline_ready) {
775 retval = -ENODATA;
776 goto out;
777 }
778
779 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
780
781 out:
782 mutex_unlock(&data->sysfs_mutex);
783 return retval;
784 }
785
786 static ssize_t max_show(struct device *dev,
787 struct device_attribute *attr, char *buf)
788 {
789 struct i2c_client *client = to_i2c_client(dev);
790 struct elan_tp_data *data = i2c_get_clientdata(client);
791 int retval;
792
793 retval = mutex_lock_interruptible(&data->sysfs_mutex);
794 if (retval)
795 return retval;
796
797 if (!data->baseline_ready) {
798 retval = -ENODATA;
799 goto out;
800 }
801
802 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
803
804 out:
805 mutex_unlock(&data->sysfs_mutex);
806 return retval;
807 }
808
809
810 static DEVICE_ATTR_WO(acquire);
811 static DEVICE_ATTR_RO(min);
812 static DEVICE_ATTR_RO(max);
813
814 static struct attribute *elan_baseline_sysfs_entries[] = {
815 &dev_attr_acquire.attr,
816 &dev_attr_min.attr,
817 &dev_attr_max.attr,
818 NULL,
819 };
820
821 static const struct attribute_group elan_baseline_sysfs_group = {
822 .name = "baseline",
823 .attrs = elan_baseline_sysfs_entries,
824 };
825
826 static const struct attribute_group *elan_sysfs_groups[] = {
827 &elan_sysfs_group,
828 &elan_baseline_sysfs_group,
829 NULL
830 };
831
832 /*
833 ******************************************************************
834 * Elan isr functions
835 ******************************************************************
836 */
837 static void elan_report_contact(struct elan_tp_data *data,
838 int contact_num, bool contact_valid,
839 u8 *finger_data)
840 {
841 struct input_dev *input = data->input;
842 unsigned int pos_x, pos_y;
843 unsigned int pressure, mk_x, mk_y;
844 unsigned int area_x, area_y, major, minor;
845 unsigned int scaled_pressure;
846
847 if (contact_valid) {
848 pos_x = ((finger_data[0] & 0xf0) << 4) |
849 finger_data[1];
850 pos_y = ((finger_data[0] & 0x0f) << 8) |
851 finger_data[2];
852 mk_x = (finger_data[3] & 0x0f);
853 mk_y = (finger_data[3] >> 4);
854 pressure = finger_data[4];
855
856 if (pos_x > data->max_x || pos_y > data->max_y) {
857 dev_dbg(input->dev.parent,
858 "[%d] x=%d y=%d over max (%d, %d)",
859 contact_num, pos_x, pos_y,
860 data->max_x, data->max_y);
861 return;
862 }
863
864 /*
865 * To avoid treating large finger as palm, let's reduce the
866 * width x and y per trace.
867 */
868 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
869 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
870
871 major = max(area_x, area_y);
872 minor = min(area_x, area_y);
873
874 scaled_pressure = pressure + data->pressure_adjustment;
875
876 if (scaled_pressure > ETP_MAX_PRESSURE)
877 scaled_pressure = ETP_MAX_PRESSURE;
878
879 input_mt_slot(input, contact_num);
880 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
881 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
882 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
883 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
884 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
885 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
886 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
887 } else {
888 input_mt_slot(input, contact_num);
889 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
890 }
891 }
892
893 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
894 {
895 struct input_dev *input = data->input;
896 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
897 int i;
898 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
899 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
900 bool contact_valid, hover_event;
901
902 hover_event = hover_info & 0x40;
903 for (i = 0; i < ETP_MAX_FINGERS; i++) {
904 contact_valid = tp_info & (1U << (3 + i));
905 elan_report_contact(data, i, contact_valid, finger_data);
906
907 if (contact_valid)
908 finger_data += ETP_FINGER_DATA_LEN;
909 }
910
911 input_report_key(input, BTN_LEFT, tp_info & 0x01);
912 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
913 input_mt_report_pointer_emulation(input, true);
914 input_sync(input);
915 }
916
917 static irqreturn_t elan_isr(int irq, void *dev_id)
918 {
919 struct elan_tp_data *data = dev_id;
920 struct device *dev = &data->client->dev;
921 int error;
922 u8 report[ETP_MAX_REPORT_LEN];
923
924 /*
925 * When device is connected to i2c bus, when all IAP page writes
926 * complete, the driver will receive interrupt and must read
927 * 0000 to confirm that IAP is finished.
928 */
929 if (data->in_fw_update) {
930 complete(&data->fw_completion);
931 goto out;
932 }
933
934 error = data->ops->get_report(data->client, report);
935 if (error)
936 goto out;
937
938 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
939 dev_err(dev, "invalid report id data (%x)\n",
940 report[ETP_REPORT_ID_OFFSET]);
941 else
942 elan_report_absolute(data, report);
943
944 out:
945 return IRQ_HANDLED;
946 }
947
948 /*
949 ******************************************************************
950 * Elan initialization functions
951 ******************************************************************
952 */
953 static int elan_setup_input_device(struct elan_tp_data *data)
954 {
955 struct device *dev = &data->client->dev;
956 struct input_dev *input;
957 unsigned int max_width = max(data->width_x, data->width_y);
958 unsigned int min_width = min(data->width_x, data->width_y);
959 int error;
960
961 input = devm_input_allocate_device(dev);
962 if (!input)
963 return -ENOMEM;
964
965 input->name = "Elan Touchpad";
966 input->id.bustype = BUS_I2C;
967 input->id.vendor = ELAN_VENDOR_ID;
968 input->id.product = data->product_id;
969 input_set_drvdata(input, data);
970
971 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
972 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
973 if (error) {
974 dev_err(dev, "failed to initialize MT slots: %d\n", error);
975 return error;
976 }
977
978 __set_bit(EV_ABS, input->evbit);
979 __set_bit(INPUT_PROP_POINTER, input->propbit);
980 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
981 __set_bit(BTN_LEFT, input->keybit);
982
983 /* Set up ST parameters */
984 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
985 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
986 input_abs_set_res(input, ABS_X, data->x_res);
987 input_abs_set_res(input, ABS_Y, data->y_res);
988 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
989 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
990 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
991
992 /* And MT parameters */
993 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
994 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
995 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
996 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
997 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
998 ETP_MAX_PRESSURE, 0, 0);
999 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
1000 ETP_FINGER_WIDTH * max_width, 0, 0);
1001 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
1002 ETP_FINGER_WIDTH * min_width, 0, 0);
1003
1004 data->input = input;
1005
1006 return 0;
1007 }
1008
1009 static void elan_disable_regulator(void *_data)
1010 {
1011 struct elan_tp_data *data = _data;
1012
1013 regulator_disable(data->vcc);
1014 }
1015
1016 static void elan_remove_sysfs_groups(void *_data)
1017 {
1018 struct elan_tp_data *data = _data;
1019
1020 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
1021 }
1022
1023 static int elan_probe(struct i2c_client *client,
1024 const struct i2c_device_id *dev_id)
1025 {
1026 const struct elan_transport_ops *transport_ops;
1027 struct device *dev = &client->dev;
1028 struct elan_tp_data *data;
1029 unsigned long irqflags;
1030 int error;
1031
1032 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1033 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1034 transport_ops = &elan_i2c_ops;
1035 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1036 i2c_check_functionality(client->adapter,
1037 I2C_FUNC_SMBUS_BYTE_DATA |
1038 I2C_FUNC_SMBUS_BLOCK_DATA |
1039 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1040 transport_ops = &elan_smbus_ops;
1041 } else {
1042 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1043 return -EIO;
1044 }
1045
1046 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1047 if (!data)
1048 return -ENOMEM;
1049
1050 i2c_set_clientdata(client, data);
1051
1052 data->ops = transport_ops;
1053 data->client = client;
1054 init_completion(&data->fw_completion);
1055 mutex_init(&data->sysfs_mutex);
1056
1057 data->vcc = devm_regulator_get(dev, "vcc");
1058 if (IS_ERR(data->vcc)) {
1059 error = PTR_ERR(data->vcc);
1060 if (error != -EPROBE_DEFER)
1061 dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1062 error);
1063 return error;
1064 }
1065
1066 error = regulator_enable(data->vcc);
1067 if (error) {
1068 dev_err(dev, "Failed to enable regulator: %d\n", error);
1069 return error;
1070 }
1071
1072 error = devm_add_action(dev, elan_disable_regulator, data);
1073 if (error) {
1074 regulator_disable(data->vcc);
1075 dev_err(dev, "Failed to add disable regulator action: %d\n",
1076 error);
1077 return error;
1078 }
1079
1080 /* Initialize the touchpad. */
1081 error = elan_initialize(data);
1082 if (error)
1083 return error;
1084
1085 error = elan_query_device_info(data);
1086 if (error)
1087 return error;
1088
1089 error = elan_query_device_parameters(data);
1090 if (error)
1091 return error;
1092
1093 dev_info(dev,
1094 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1095 data->product_id,
1096 data->fw_version,
1097 data->sm_version,
1098 data->iap_version);
1099
1100 dev_dbg(dev,
1101 "Elan Touchpad Extra Information:\n"
1102 " Max ABS X,Y: %d,%d\n"
1103 " Width X,Y: %d,%d\n"
1104 " Resolution X,Y: %d,%d (dots/mm)\n",
1105 data->max_x, data->max_y,
1106 data->width_x, data->width_y,
1107 data->x_res, data->y_res);
1108
1109 /* Set up input device properties based on queried parameters. */
1110 error = elan_setup_input_device(data);
1111 if (error)
1112 return error;
1113
1114 /*
1115 * Systems using device tree should set up interrupt via DTS,
1116 * the rest will use the default falling edge interrupts.
1117 */
1118 irqflags = dev->of_node ? 0 : IRQF_TRIGGER_FALLING;
1119
1120 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1121 irqflags | IRQF_ONESHOT,
1122 client->name, data);
1123 if (error) {
1124 dev_err(dev, "cannot register irq=%d\n", client->irq);
1125 return error;
1126 }
1127
1128 error = sysfs_create_groups(&dev->kobj, elan_sysfs_groups);
1129 if (error) {
1130 dev_err(dev, "failed to create sysfs attributes: %d\n", error);
1131 return error;
1132 }
1133
1134 error = devm_add_action(dev, elan_remove_sysfs_groups, data);
1135 if (error) {
1136 elan_remove_sysfs_groups(data);
1137 dev_err(dev, "Failed to add sysfs cleanup action: %d\n",
1138 error);
1139 return error;
1140 }
1141
1142 error = input_register_device(data->input);
1143 if (error) {
1144 dev_err(dev, "failed to register input device: %d\n", error);
1145 return error;
1146 }
1147
1148 /*
1149 * Systems using device tree should set up wakeup via DTS,
1150 * the rest will configure device as wakeup source by default.
1151 */
1152 if (!dev->of_node)
1153 device_init_wakeup(dev, true);
1154
1155 return 0;
1156 }
1157
1158 static int __maybe_unused elan_suspend(struct device *dev)
1159 {
1160 struct i2c_client *client = to_i2c_client(dev);
1161 struct elan_tp_data *data = i2c_get_clientdata(client);
1162 int ret;
1163
1164 /*
1165 * We are taking the mutex to make sure sysfs operations are
1166 * complete before we attempt to bring the device into low[er]
1167 * power mode.
1168 */
1169 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1170 if (ret)
1171 return ret;
1172
1173 disable_irq(client->irq);
1174
1175 if (device_may_wakeup(dev)) {
1176 ret = elan_sleep(data);
1177 /* Enable wake from IRQ */
1178 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1179 } else {
1180 ret = elan_disable_power(data);
1181 }
1182
1183 mutex_unlock(&data->sysfs_mutex);
1184 return ret;
1185 }
1186
1187 static int __maybe_unused elan_resume(struct device *dev)
1188 {
1189 struct i2c_client *client = to_i2c_client(dev);
1190 struct elan_tp_data *data = i2c_get_clientdata(client);
1191 int error;
1192
1193 if (device_may_wakeup(dev) && data->irq_wake) {
1194 disable_irq_wake(client->irq);
1195 data->irq_wake = false;
1196 }
1197
1198 error = elan_enable_power(data);
1199 if (error) {
1200 dev_err(dev, "power up when resuming failed: %d\n", error);
1201 goto err;
1202 }
1203
1204 error = elan_initialize(data);
1205 if (error)
1206 dev_err(dev, "initialize when resuming failed: %d\n", error);
1207
1208 err:
1209 enable_irq(data->client->irq);
1210 return error;
1211 }
1212
1213 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1214
1215 static const struct i2c_device_id elan_id[] = {
1216 { DRIVER_NAME, 0 },
1217 { },
1218 };
1219 MODULE_DEVICE_TABLE(i2c, elan_id);
1220
1221 #ifdef CONFIG_ACPI
1222 static const struct acpi_device_id elan_acpi_id[] = {
1223 { "ELAN0000", 0 },
1224 { "ELAN0100", 0 },
1225 { "ELAN0600", 0 },
1226 { "ELAN0605", 0 },
1227 { "ELAN1000", 0 },
1228 { }
1229 };
1230 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1231 #endif
1232
1233 #ifdef CONFIG_OF
1234 static const struct of_device_id elan_of_match[] = {
1235 { .compatible = "elan,ekth3000" },
1236 { /* sentinel */ }
1237 };
1238 MODULE_DEVICE_TABLE(of, elan_of_match);
1239 #endif
1240
1241 static struct i2c_driver elan_driver = {
1242 .driver = {
1243 .name = DRIVER_NAME,
1244 .pm = &elan_pm_ops,
1245 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1246 .of_match_table = of_match_ptr(elan_of_match),
1247 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1248 },
1249 .probe = elan_probe,
1250 .id_table = elan_id,
1251 };
1252
1253 module_i2c_driver(elan_driver);
1254
1255 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1256 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1257 MODULE_LICENSE("GPL");
1258 MODULE_VERSION(ELAN_DRIVER_VERSION);