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/input/elan-i2c-ids.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_VENDOR_ID 0x04f3
45 #define ETP_MAX_PRESSURE 255
46 #define ETP_FWIDTH_REDUCE 90
47 #define ETP_FINGER_WIDTH 15
48 #define ETP_RETRY_COUNT 3
49
50 /* The main device structure */
51 struct elan_tp_data {
52 struct i2c_client *client;
53 struct input_dev *input;
54 struct input_dev *tp_input; /* trackpoint input node */
55 struct regulator *vcc;
56
57 const struct elan_transport_ops *ops;
58
59 /* for fw update */
60 struct completion fw_completion;
61 bool in_fw_update;
62
63 struct mutex sysfs_mutex;
64
65 unsigned int max_x;
66 unsigned int max_y;
67 unsigned int width_x;
68 unsigned int width_y;
69 unsigned int x_res;
70 unsigned int y_res;
71
72 u8 pattern;
73 u16 product_id;
74 u8 fw_version;
75 u8 sm_version;
76 u8 iap_version;
77 u16 fw_checksum;
78 unsigned int report_features;
79 unsigned int report_len;
80 int pressure_adjustment;
81 u8 mode;
82 u16 ic_type;
83 u16 fw_validpage_count;
84 u16 fw_page_size;
85 u32 fw_signature_address;
86
87 bool irq_wake;
88
89 u8 min_baseline;
90 u8 max_baseline;
91 bool baseline_ready;
92 u8 clickpad;
93 bool middle_button;
94 };
95
elan_get_fwinfo(u16 ic_type,u8 iap_version,u16 * validpage_count,u32 * signature_address,u16 * page_size)96 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
97 u32 *signature_address, u16 *page_size)
98 {
99 switch (ic_type) {
100 case 0x00:
101 case 0x06:
102 case 0x08:
103 *validpage_count = 512;
104 break;
105 case 0x03:
106 case 0x07:
107 case 0x09:
108 case 0x0A:
109 case 0x0B:
110 case 0x0C:
111 *validpage_count = 768;
112 break;
113 case 0x0D:
114 *validpage_count = 896;
115 break;
116 case 0x0E:
117 *validpage_count = 640;
118 break;
119 case 0x10:
120 *validpage_count = 1024;
121 break;
122 case 0x11:
123 *validpage_count = 1280;
124 break;
125 case 0x13:
126 *validpage_count = 2048;
127 break;
128 case 0x14:
129 case 0x15:
130 *validpage_count = 1024;
131 break;
132 default:
133 /* unknown ic type clear value */
134 *validpage_count = 0;
135 *signature_address = 0;
136 *page_size = 0;
137 return -ENXIO;
138 }
139
140 *signature_address =
141 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
142
143 if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
144 *validpage_count /= 8;
145 *page_size = ETP_FW_PAGE_SIZE_512;
146 } else if (ic_type >= 0x0D && iap_version >= 1) {
147 *validpage_count /= 2;
148 *page_size = ETP_FW_PAGE_SIZE_128;
149 } else {
150 *page_size = ETP_FW_PAGE_SIZE;
151 }
152
153 return 0;
154 }
155
elan_enable_power(struct elan_tp_data * data)156 static int elan_enable_power(struct elan_tp_data *data)
157 {
158 int repeat = ETP_RETRY_COUNT;
159 int error;
160
161 error = regulator_enable(data->vcc);
162 if (error) {
163 dev_err(&data->client->dev,
164 "failed to enable regulator: %d\n", error);
165 return error;
166 }
167
168 do {
169 error = data->ops->power_control(data->client, true);
170 if (error >= 0)
171 return 0;
172
173 msleep(30);
174 } while (--repeat > 0);
175
176 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
177 return error;
178 }
179
elan_disable_power(struct elan_tp_data * data)180 static int elan_disable_power(struct elan_tp_data *data)
181 {
182 int repeat = ETP_RETRY_COUNT;
183 int error;
184
185 do {
186 error = data->ops->power_control(data->client, false);
187 if (!error) {
188 error = regulator_disable(data->vcc);
189 if (error) {
190 dev_err(&data->client->dev,
191 "failed to disable regulator: %d\n",
192 error);
193 /* Attempt to power the chip back up */
194 data->ops->power_control(data->client, true);
195 break;
196 }
197
198 return 0;
199 }
200
201 msleep(30);
202 } while (--repeat > 0);
203
204 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
205 return error;
206 }
207
elan_sleep(struct elan_tp_data * data)208 static int elan_sleep(struct elan_tp_data *data)
209 {
210 int repeat = ETP_RETRY_COUNT;
211 int error;
212
213 do {
214 error = data->ops->sleep_control(data->client, true);
215 if (!error)
216 return 0;
217
218 msleep(30);
219 } while (--repeat > 0);
220
221 return error;
222 }
223
elan_query_product(struct elan_tp_data * data)224 static int elan_query_product(struct elan_tp_data *data)
225 {
226 int error;
227
228 error = data->ops->get_product_id(data->client, &data->product_id);
229 if (error)
230 return error;
231
232 error = data->ops->get_pattern(data->client, &data->pattern);
233 if (error)
234 return error;
235
236 error = data->ops->get_sm_version(data->client, data->pattern,
237 &data->ic_type, &data->sm_version,
238 &data->clickpad);
239 if (error)
240 return error;
241
242 return 0;
243 }
244
elan_check_ASUS_special_fw(struct elan_tp_data * data)245 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
246 {
247 if (data->ic_type == 0x0E) {
248 switch (data->product_id) {
249 case 0x05 ... 0x07:
250 case 0x09:
251 case 0x13:
252 return true;
253 }
254 } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
255 /* ASUS EeeBook X205TA */
256 return true;
257 }
258
259 return false;
260 }
261
__elan_initialize(struct elan_tp_data * data)262 static int __elan_initialize(struct elan_tp_data *data)
263 {
264 struct i2c_client *client = data->client;
265 bool woken_up = false;
266 int error;
267
268 error = data->ops->initialize(client);
269 if (error) {
270 dev_err(&client->dev, "device initialize failed: %d\n", error);
271 return error;
272 }
273
274 error = elan_query_product(data);
275 if (error)
276 return error;
277
278 /*
279 * Some ASUS devices were shipped with firmware that requires
280 * touchpads to be woken up first, before attempting to switch
281 * them into absolute reporting mode.
282 */
283 if (elan_check_ASUS_special_fw(data)) {
284 error = data->ops->sleep_control(client, false);
285 if (error) {
286 dev_err(&client->dev,
287 "failed to wake device up: %d\n", error);
288 return error;
289 }
290
291 msleep(200);
292 woken_up = true;
293 }
294
295 data->mode |= ETP_ENABLE_ABS;
296 error = data->ops->set_mode(client, data->mode);
297 if (error) {
298 dev_err(&client->dev,
299 "failed to switch to absolute mode: %d\n", error);
300 return error;
301 }
302
303 if (!woken_up) {
304 error = data->ops->sleep_control(client, false);
305 if (error) {
306 dev_err(&client->dev,
307 "failed to wake device up: %d\n", error);
308 return error;
309 }
310 }
311
312 return 0;
313 }
314
elan_initialize(struct elan_tp_data * data)315 static int elan_initialize(struct elan_tp_data *data)
316 {
317 int repeat = ETP_RETRY_COUNT;
318 int error;
319
320 do {
321 error = __elan_initialize(data);
322 if (!error)
323 return 0;
324
325 msleep(30);
326 } while (--repeat > 0);
327
328 return error;
329 }
330
elan_query_device_info(struct elan_tp_data * data)331 static int elan_query_device_info(struct elan_tp_data *data)
332 {
333 int error;
334
335 error = data->ops->get_version(data->client, data->pattern, false,
336 &data->fw_version);
337 if (error)
338 return error;
339
340 error = data->ops->get_checksum(data->client, false,
341 &data->fw_checksum);
342 if (error)
343 return error;
344
345 error = data->ops->get_version(data->client, data->pattern,
346 true, &data->iap_version);
347 if (error)
348 return error;
349
350 error = data->ops->get_pressure_adjustment(data->client,
351 &data->pressure_adjustment);
352 if (error)
353 return error;
354
355 error = data->ops->get_report_features(data->client, data->pattern,
356 &data->report_features,
357 &data->report_len);
358 if (error)
359 return error;
360
361 error = elan_get_fwinfo(data->ic_type, data->iap_version,
362 &data->fw_validpage_count,
363 &data->fw_signature_address,
364 &data->fw_page_size);
365 if (error)
366 dev_warn(&data->client->dev,
367 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
368 data->iap_version, data->ic_type);
369
370 return 0;
371 }
372
elan_convert_resolution(u8 val,u8 pattern)373 static unsigned int elan_convert_resolution(u8 val, u8 pattern)
374 {
375 /*
376 * pattern <= 0x01:
377 * (value from firmware) * 10 + 790 = dpi
378 * else
379 * ((value from firmware) + 3) * 100 = dpi
380 */
381 int res = pattern <= 0x01 ?
382 (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
383 /*
384 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
385 * point).
386 */
387 return res * 10 / 254;
388 }
389
elan_query_device_parameters(struct elan_tp_data * data)390 static int elan_query_device_parameters(struct elan_tp_data *data)
391 {
392 struct i2c_client *client = data->client;
393 unsigned int x_traces, y_traces;
394 u32 x_mm, y_mm;
395 u8 hw_x_res, hw_y_res;
396 int error;
397
398 if (device_property_read_u32(&client->dev,
399 "touchscreen-size-x", &data->max_x) ||
400 device_property_read_u32(&client->dev,
401 "touchscreen-size-y", &data->max_y)) {
402 error = data->ops->get_max(data->client,
403 &data->max_x,
404 &data->max_y);
405 if (error)
406 return error;
407 } else {
408 /* size is the maximum + 1 */
409 --data->max_x;
410 --data->max_y;
411 }
412
413 if (device_property_read_u32(&client->dev,
414 "elan,x_traces",
415 &x_traces) ||
416 device_property_read_u32(&client->dev,
417 "elan,y_traces",
418 &y_traces)) {
419 error = data->ops->get_num_traces(data->client,
420 &x_traces, &y_traces);
421 if (error)
422 return error;
423 }
424 data->width_x = data->max_x / x_traces;
425 data->width_y = data->max_y / y_traces;
426
427 if (device_property_read_u32(&client->dev,
428 "touchscreen-x-mm", &x_mm) ||
429 device_property_read_u32(&client->dev,
430 "touchscreen-y-mm", &y_mm)) {
431 error = data->ops->get_resolution(data->client,
432 &hw_x_res, &hw_y_res);
433 if (error)
434 return error;
435
436 data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
437 data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
438 } else {
439 data->x_res = (data->max_x + 1) / x_mm;
440 data->y_res = (data->max_y + 1) / y_mm;
441 }
442
443 if (device_property_read_bool(&client->dev, "elan,clickpad"))
444 data->clickpad = 1;
445
446 if (device_property_read_bool(&client->dev, "elan,middle-button"))
447 data->middle_button = true;
448
449 return 0;
450 }
451
452 /*
453 **********************************************************
454 * IAP firmware updater related routines
455 **********************************************************
456 */
elan_write_fw_block(struct elan_tp_data * data,u16 page_size,const u8 * page,u16 checksum,int idx)457 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
458 const u8 *page, u16 checksum, int idx)
459 {
460 int retry = ETP_RETRY_COUNT;
461 int error;
462
463 do {
464 error = data->ops->write_fw_block(data->client, page_size,
465 page, checksum, idx);
466 if (!error)
467 return 0;
468
469 dev_dbg(&data->client->dev,
470 "IAP retrying page %d (error: %d)\n", idx, error);
471 } while (--retry > 0);
472
473 return error;
474 }
475
__elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)476 static int __elan_update_firmware(struct elan_tp_data *data,
477 const struct firmware *fw)
478 {
479 struct i2c_client *client = data->client;
480 struct device *dev = &client->dev;
481 int i, j;
482 int error;
483 u16 iap_start_addr;
484 u16 boot_page_count;
485 u16 sw_checksum = 0, fw_checksum = 0;
486
487 error = data->ops->prepare_fw_update(client, data->ic_type,
488 data->iap_version,
489 data->fw_page_size);
490 if (error)
491 return error;
492
493 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
494
495 boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
496 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
497 u16 checksum = 0;
498 const u8 *page = &fw->data[i * data->fw_page_size];
499
500 for (j = 0; j < data->fw_page_size; j += 2)
501 checksum += ((page[j + 1] << 8) | page[j]);
502
503 error = elan_write_fw_block(data, data->fw_page_size,
504 page, checksum, i);
505 if (error) {
506 dev_err(dev, "write page %d fail: %d\n", i, error);
507 return error;
508 }
509
510 sw_checksum += checksum;
511 }
512
513 /* Wait WDT reset and power on reset */
514 msleep(600);
515
516 error = data->ops->finish_fw_update(client, &data->fw_completion);
517 if (error)
518 return error;
519
520 error = data->ops->get_checksum(client, true, &fw_checksum);
521 if (error)
522 return error;
523
524 if (sw_checksum != fw_checksum) {
525 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
526 sw_checksum, fw_checksum);
527 return -EIO;
528 }
529
530 return 0;
531 }
532
elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)533 static int elan_update_firmware(struct elan_tp_data *data,
534 const struct firmware *fw)
535 {
536 struct i2c_client *client = data->client;
537 int retval;
538
539 dev_dbg(&client->dev, "Starting firmware update....\n");
540
541 disable_irq(client->irq);
542 data->in_fw_update = true;
543
544 retval = __elan_update_firmware(data, fw);
545 if (retval) {
546 dev_err(&client->dev, "firmware update failed: %d\n", retval);
547 data->ops->iap_reset(client);
548 } else {
549 /* Reinitialize TP after fw is updated */
550 elan_initialize(data);
551 elan_query_device_info(data);
552 }
553
554 data->in_fw_update = false;
555 enable_irq(client->irq);
556
557 return retval;
558 }
559
560 /*
561 *******************************************************************
562 * SYSFS attributes
563 *******************************************************************
564 */
elan_sysfs_read_fw_checksum(struct device * dev,struct device_attribute * attr,char * buf)565 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
566 struct device_attribute *attr,
567 char *buf)
568 {
569 struct i2c_client *client = to_i2c_client(dev);
570 struct elan_tp_data *data = i2c_get_clientdata(client);
571
572 return sprintf(buf, "0x%04x\n", data->fw_checksum);
573 }
574
elan_sysfs_read_product_id(struct device * dev,struct device_attribute * attr,char * buf)575 static ssize_t elan_sysfs_read_product_id(struct device *dev,
576 struct device_attribute *attr,
577 char *buf)
578 {
579 struct i2c_client *client = to_i2c_client(dev);
580 struct elan_tp_data *data = i2c_get_clientdata(client);
581
582 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
583 data->product_id);
584 }
585
elan_sysfs_read_fw_ver(struct device * dev,struct device_attribute * attr,char * buf)586 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
587 struct device_attribute *attr,
588 char *buf)
589 {
590 struct i2c_client *client = to_i2c_client(dev);
591 struct elan_tp_data *data = i2c_get_clientdata(client);
592
593 return sprintf(buf, "%d.0\n", data->fw_version);
594 }
595
elan_sysfs_read_sm_ver(struct device * dev,struct device_attribute * attr,char * buf)596 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
597 struct device_attribute *attr,
598 char *buf)
599 {
600 struct i2c_client *client = to_i2c_client(dev);
601 struct elan_tp_data *data = i2c_get_clientdata(client);
602
603 return sprintf(buf, "%d.0\n", data->sm_version);
604 }
605
elan_sysfs_read_iap_ver(struct device * dev,struct device_attribute * attr,char * buf)606 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
607 struct device_attribute *attr,
608 char *buf)
609 {
610 struct i2c_client *client = to_i2c_client(dev);
611 struct elan_tp_data *data = i2c_get_clientdata(client);
612
613 return sprintf(buf, "%d.0\n", data->iap_version);
614 }
615
elan_sysfs_update_fw(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)616 static ssize_t elan_sysfs_update_fw(struct device *dev,
617 struct device_attribute *attr,
618 const char *buf, size_t count)
619 {
620 struct elan_tp_data *data = dev_get_drvdata(dev);
621 const struct firmware *fw;
622 char *fw_name;
623 int error;
624 const u8 *fw_signature;
625 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
626
627 if (data->fw_validpage_count == 0)
628 return -EINVAL;
629
630 /* Look for a firmware with the product id appended. */
631 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
632 if (!fw_name) {
633 dev_err(dev, "failed to allocate memory for firmware name\n");
634 return -ENOMEM;
635 }
636
637 dev_info(dev, "requesting fw '%s'\n", fw_name);
638 error = request_firmware(&fw, fw_name, dev);
639 kfree(fw_name);
640 if (error) {
641 dev_err(dev, "failed to request firmware: %d\n", error);
642 return error;
643 }
644
645 /* Firmware file must match signature data */
646 fw_signature = &fw->data[data->fw_signature_address];
647 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
648 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
649 (int)sizeof(signature), signature,
650 (int)sizeof(signature), fw_signature);
651 error = -EBADF;
652 goto out_release_fw;
653 }
654
655 error = mutex_lock_interruptible(&data->sysfs_mutex);
656 if (error)
657 goto out_release_fw;
658
659 error = elan_update_firmware(data, fw);
660
661 mutex_unlock(&data->sysfs_mutex);
662
663 out_release_fw:
664 release_firmware(fw);
665 return error ?: count;
666 }
667
calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)668 static ssize_t calibrate_store(struct device *dev,
669 struct device_attribute *attr,
670 const char *buf, size_t count)
671 {
672 struct i2c_client *client = to_i2c_client(dev);
673 struct elan_tp_data *data = i2c_get_clientdata(client);
674 int tries = 20;
675 int retval;
676 int error;
677 u8 val[ETP_CALIBRATE_MAX_LEN];
678
679 retval = mutex_lock_interruptible(&data->sysfs_mutex);
680 if (retval)
681 return retval;
682
683 disable_irq(client->irq);
684
685 data->mode |= ETP_ENABLE_CALIBRATE;
686 retval = data->ops->set_mode(client, data->mode);
687 if (retval) {
688 dev_err(dev, "failed to enable calibration mode: %d\n",
689 retval);
690 goto out;
691 }
692
693 retval = data->ops->calibrate(client);
694 if (retval) {
695 dev_err(dev, "failed to start calibration: %d\n",
696 retval);
697 goto out_disable_calibrate;
698 }
699
700 val[0] = 0xff;
701 do {
702 /* Wait 250ms before checking if calibration has completed. */
703 msleep(250);
704
705 retval = data->ops->calibrate_result(client, val);
706 if (retval)
707 dev_err(dev, "failed to check calibration result: %d\n",
708 retval);
709 else if (val[0] == 0)
710 break; /* calibration done */
711
712 } while (--tries);
713
714 if (tries == 0) {
715 dev_err(dev, "failed to calibrate. Timeout.\n");
716 retval = -ETIMEDOUT;
717 }
718
719 out_disable_calibrate:
720 data->mode &= ~ETP_ENABLE_CALIBRATE;
721 error = data->ops->set_mode(data->client, data->mode);
722 if (error) {
723 dev_err(dev, "failed to disable calibration mode: %d\n",
724 error);
725 if (!retval)
726 retval = error;
727 }
728 out:
729 enable_irq(client->irq);
730 mutex_unlock(&data->sysfs_mutex);
731 return retval ?: count;
732 }
733
elan_sysfs_read_mode(struct device * dev,struct device_attribute * attr,char * buf)734 static ssize_t elan_sysfs_read_mode(struct device *dev,
735 struct device_attribute *attr,
736 char *buf)
737 {
738 struct i2c_client *client = to_i2c_client(dev);
739 struct elan_tp_data *data = i2c_get_clientdata(client);
740 int error;
741 enum tp_mode mode;
742
743 error = mutex_lock_interruptible(&data->sysfs_mutex);
744 if (error)
745 return error;
746
747 error = data->ops->iap_get_mode(data->client, &mode);
748
749 mutex_unlock(&data->sysfs_mutex);
750
751 if (error)
752 return error;
753
754 return sprintf(buf, "%d\n", (int)mode);
755 }
756
757 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
758 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
759 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
760 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
761 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
762 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
763 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
764
765 static DEVICE_ATTR_WO(calibrate);
766
767 static struct attribute *elan_sysfs_entries[] = {
768 &dev_attr_product_id.attr,
769 &dev_attr_firmware_version.attr,
770 &dev_attr_sample_version.attr,
771 &dev_attr_iap_version.attr,
772 &dev_attr_fw_checksum.attr,
773 &dev_attr_calibrate.attr,
774 &dev_attr_mode.attr,
775 &dev_attr_update_fw.attr,
776 NULL,
777 };
778
779 static const struct attribute_group elan_sysfs_group = {
780 .attrs = elan_sysfs_entries,
781 };
782
acquire_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)783 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
784 const char *buf, size_t count)
785 {
786 struct i2c_client *client = to_i2c_client(dev);
787 struct elan_tp_data *data = i2c_get_clientdata(client);
788 int error;
789 int retval;
790
791 retval = mutex_lock_interruptible(&data->sysfs_mutex);
792 if (retval)
793 return retval;
794
795 disable_irq(client->irq);
796
797 data->baseline_ready = false;
798
799 data->mode |= ETP_ENABLE_CALIBRATE;
800 retval = data->ops->set_mode(data->client, data->mode);
801 if (retval) {
802 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
803 retval);
804 goto out;
805 }
806
807 msleep(250);
808
809 retval = data->ops->get_baseline_data(data->client, true,
810 &data->max_baseline);
811 if (retval) {
812 dev_err(dev, "Failed to read max baseline form device: %d\n",
813 retval);
814 goto out_disable_calibrate;
815 }
816
817 retval = data->ops->get_baseline_data(data->client, false,
818 &data->min_baseline);
819 if (retval) {
820 dev_err(dev, "Failed to read min baseline form device: %d\n",
821 retval);
822 goto out_disable_calibrate;
823 }
824
825 data->baseline_ready = true;
826
827 out_disable_calibrate:
828 data->mode &= ~ETP_ENABLE_CALIBRATE;
829 error = data->ops->set_mode(data->client, data->mode);
830 if (error) {
831 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
832 error);
833 if (!retval)
834 retval = error;
835 }
836 out:
837 enable_irq(client->irq);
838 mutex_unlock(&data->sysfs_mutex);
839 return retval ?: count;
840 }
841
min_show(struct device * dev,struct device_attribute * attr,char * buf)842 static ssize_t min_show(struct device *dev,
843 struct device_attribute *attr, char *buf)
844 {
845 struct i2c_client *client = to_i2c_client(dev);
846 struct elan_tp_data *data = i2c_get_clientdata(client);
847 int retval;
848
849 retval = mutex_lock_interruptible(&data->sysfs_mutex);
850 if (retval)
851 return retval;
852
853 if (!data->baseline_ready) {
854 retval = -ENODATA;
855 goto out;
856 }
857
858 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
859
860 out:
861 mutex_unlock(&data->sysfs_mutex);
862 return retval;
863 }
864
max_show(struct device * dev,struct device_attribute * attr,char * buf)865 static ssize_t max_show(struct device *dev,
866 struct device_attribute *attr, char *buf)
867 {
868 struct i2c_client *client = to_i2c_client(dev);
869 struct elan_tp_data *data = i2c_get_clientdata(client);
870 int retval;
871
872 retval = mutex_lock_interruptible(&data->sysfs_mutex);
873 if (retval)
874 return retval;
875
876 if (!data->baseline_ready) {
877 retval = -ENODATA;
878 goto out;
879 }
880
881 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
882
883 out:
884 mutex_unlock(&data->sysfs_mutex);
885 return retval;
886 }
887
888
889 static DEVICE_ATTR_WO(acquire);
890 static DEVICE_ATTR_RO(min);
891 static DEVICE_ATTR_RO(max);
892
893 static struct attribute *elan_baseline_sysfs_entries[] = {
894 &dev_attr_acquire.attr,
895 &dev_attr_min.attr,
896 &dev_attr_max.attr,
897 NULL,
898 };
899
900 static const struct attribute_group elan_baseline_sysfs_group = {
901 .name = "baseline",
902 .attrs = elan_baseline_sysfs_entries,
903 };
904
905 static const struct attribute_group *elan_sysfs_groups[] = {
906 &elan_sysfs_group,
907 &elan_baseline_sysfs_group,
908 NULL
909 };
910
911 /*
912 ******************************************************************
913 * Elan isr functions
914 ******************************************************************
915 */
elan_report_contact(struct elan_tp_data * data,int contact_num,bool contact_valid,bool high_precision,u8 * packet,u8 * finger_data)916 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
917 bool contact_valid, bool high_precision,
918 u8 *packet, u8 *finger_data)
919 {
920 struct input_dev *input = data->input;
921 unsigned int pos_x, pos_y;
922 unsigned int pressure, scaled_pressure;
923
924 if (contact_valid) {
925 if (high_precision) {
926 pos_x = get_unaligned_be16(&finger_data[0]);
927 pos_y = get_unaligned_be16(&finger_data[2]);
928 } else {
929 pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
930 pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
931 }
932
933 if (pos_x > data->max_x || pos_y > data->max_y) {
934 dev_dbg(input->dev.parent,
935 "[%d] x=%d y=%d over max (%d, %d)",
936 contact_num, pos_x, pos_y,
937 data->max_x, data->max_y);
938 return;
939 }
940
941 pressure = finger_data[4];
942 scaled_pressure = pressure + data->pressure_adjustment;
943 if (scaled_pressure > ETP_MAX_PRESSURE)
944 scaled_pressure = ETP_MAX_PRESSURE;
945
946 input_mt_slot(input, contact_num);
947 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
948 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
949 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
950 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
951
952 if (data->report_features & ETP_FEATURE_REPORT_MK) {
953 unsigned int mk_x, mk_y, area_x, area_y;
954 u8 mk_data = high_precision ?
955 packet[ETP_MK_DATA_OFFSET + contact_num] :
956 finger_data[3];
957
958 mk_x = mk_data & 0x0f;
959 mk_y = mk_data >> 4;
960
961 /*
962 * To avoid treating large finger as palm, let's reduce
963 * the width x and y per trace.
964 */
965 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
966 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
967
968 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
969 input_report_abs(input, ABS_MT_TOUCH_MAJOR,
970 max(area_x, area_y));
971 input_report_abs(input, ABS_MT_TOUCH_MINOR,
972 min(area_x, area_y));
973 }
974 } else {
975 input_mt_slot(input, contact_num);
976 input_mt_report_slot_inactive(input);
977 }
978 }
979
elan_report_absolute(struct elan_tp_data * data,u8 * packet,bool high_precision)980 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
981 bool high_precision)
982 {
983 struct input_dev *input = data->input;
984 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
985 int i;
986 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
987 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
988 bool contact_valid, hover_event;
989
990 pm_wakeup_event(&data->client->dev, 0);
991
992 hover_event = hover_info & BIT(6);
993
994 for (i = 0; i < ETP_MAX_FINGERS; i++) {
995 contact_valid = tp_info & BIT(3 + i);
996 elan_report_contact(data, i, contact_valid, high_precision,
997 packet, finger_data);
998 if (contact_valid)
999 finger_data += ETP_FINGER_DATA_LEN;
1000 }
1001
1002 input_report_key(input, BTN_LEFT, tp_info & BIT(0));
1003 input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1004 input_report_key(input, BTN_RIGHT, tp_info & BIT(1));
1005 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1006 input_mt_report_pointer_emulation(input, true);
1007 input_sync(input);
1008 }
1009
elan_report_trackpoint(struct elan_tp_data * data,u8 * report)1010 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1011 {
1012 struct input_dev *input = data->tp_input;
1013 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1014 int x, y;
1015
1016 pm_wakeup_event(&data->client->dev, 0);
1017
1018 if (!data->tp_input) {
1019 dev_warn_once(&data->client->dev,
1020 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1021 return;
1022 }
1023
1024 input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1025 input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1026 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1027
1028 if ((packet[3] & 0x0F) == 0x06) {
1029 x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1030 y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1031
1032 input_report_rel(input, REL_X, x);
1033 input_report_rel(input, REL_Y, y);
1034 }
1035
1036 input_sync(input);
1037 }
1038
elan_isr(int irq,void * dev_id)1039 static irqreturn_t elan_isr(int irq, void *dev_id)
1040 {
1041 struct elan_tp_data *data = dev_id;
1042 int error;
1043 u8 report[ETP_MAX_REPORT_LEN];
1044
1045 /*
1046 * When device is connected to i2c bus, when all IAP page writes
1047 * complete, the driver will receive interrupt and must read
1048 * 0000 to confirm that IAP is finished.
1049 */
1050 if (data->in_fw_update) {
1051 complete(&data->fw_completion);
1052 goto out;
1053 }
1054
1055 error = data->ops->get_report(data->client, report, data->report_len);
1056 if (error)
1057 goto out;
1058
1059 switch (report[ETP_REPORT_ID_OFFSET]) {
1060 case ETP_REPORT_ID:
1061 elan_report_absolute(data, report, false);
1062 break;
1063 case ETP_REPORT_ID2:
1064 elan_report_absolute(data, report, true);
1065 break;
1066 case ETP_TP_REPORT_ID:
1067 case ETP_TP_REPORT_ID2:
1068 elan_report_trackpoint(data, report);
1069 break;
1070 default:
1071 dev_err(&data->client->dev, "invalid report id data (%x)\n",
1072 report[ETP_REPORT_ID_OFFSET]);
1073 }
1074
1075 out:
1076 return IRQ_HANDLED;
1077 }
1078
1079 /*
1080 ******************************************************************
1081 * Elan initialization functions
1082 ******************************************************************
1083 */
1084
elan_setup_trackpoint_input_device(struct elan_tp_data * data)1085 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1086 {
1087 struct device *dev = &data->client->dev;
1088 struct input_dev *input;
1089
1090 input = devm_input_allocate_device(dev);
1091 if (!input)
1092 return -ENOMEM;
1093
1094 input->name = "Elan TrackPoint";
1095 input->id.bustype = BUS_I2C;
1096 input->id.vendor = ELAN_VENDOR_ID;
1097 input->id.product = data->product_id;
1098 input_set_drvdata(input, data);
1099
1100 input_set_capability(input, EV_REL, REL_X);
1101 input_set_capability(input, EV_REL, REL_Y);
1102 input_set_capability(input, EV_KEY, BTN_LEFT);
1103 input_set_capability(input, EV_KEY, BTN_RIGHT);
1104 input_set_capability(input, EV_KEY, BTN_MIDDLE);
1105
1106 __set_bit(INPUT_PROP_POINTER, input->propbit);
1107 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1108
1109 data->tp_input = input;
1110
1111 return 0;
1112 }
1113
elan_setup_input_device(struct elan_tp_data * data)1114 static int elan_setup_input_device(struct elan_tp_data *data)
1115 {
1116 struct device *dev = &data->client->dev;
1117 struct input_dev *input;
1118 unsigned int max_width = max(data->width_x, data->width_y);
1119 unsigned int min_width = min(data->width_x, data->width_y);
1120 int error;
1121
1122 input = devm_input_allocate_device(dev);
1123 if (!input)
1124 return -ENOMEM;
1125
1126 input->name = "Elan Touchpad";
1127 input->id.bustype = BUS_I2C;
1128 input->id.vendor = ELAN_VENDOR_ID;
1129 input->id.product = data->product_id;
1130 input_set_drvdata(input, data);
1131
1132 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1133 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1134 if (error) {
1135 dev_err(dev, "failed to initialize MT slots: %d\n", error);
1136 return error;
1137 }
1138
1139 __set_bit(EV_ABS, input->evbit);
1140 __set_bit(INPUT_PROP_POINTER, input->propbit);
1141 if (data->clickpad) {
1142 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1143 } else {
1144 __set_bit(BTN_RIGHT, input->keybit);
1145 if (data->middle_button)
1146 __set_bit(BTN_MIDDLE, input->keybit);
1147 }
1148 __set_bit(BTN_LEFT, input->keybit);
1149
1150 /* Set up ST parameters */
1151 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1152 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1153 input_abs_set_res(input, ABS_X, data->x_res);
1154 input_abs_set_res(input, ABS_Y, data->y_res);
1155 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1156 if (data->report_features & ETP_FEATURE_REPORT_MK)
1157 input_set_abs_params(input, ABS_TOOL_WIDTH,
1158 0, ETP_FINGER_WIDTH, 0, 0);
1159 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1160
1161 /* And MT parameters */
1162 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1163 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1164 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1165 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1166 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1167 ETP_MAX_PRESSURE, 0, 0);
1168 if (data->report_features & ETP_FEATURE_REPORT_MK) {
1169 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1170 0, ETP_FINGER_WIDTH * max_width, 0, 0);
1171 input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1172 0, ETP_FINGER_WIDTH * min_width, 0, 0);
1173 }
1174
1175 data->input = input;
1176
1177 return 0;
1178 }
1179
elan_disable_regulator(void * _data)1180 static void elan_disable_regulator(void *_data)
1181 {
1182 struct elan_tp_data *data = _data;
1183
1184 regulator_disable(data->vcc);
1185 }
1186
elan_probe(struct i2c_client * client,const struct i2c_device_id * dev_id)1187 static int elan_probe(struct i2c_client *client,
1188 const struct i2c_device_id *dev_id)
1189 {
1190 const struct elan_transport_ops *transport_ops;
1191 struct device *dev = &client->dev;
1192 struct elan_tp_data *data;
1193 unsigned long irqflags;
1194 int error;
1195
1196 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1197 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1198 transport_ops = &elan_i2c_ops;
1199 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1200 i2c_check_functionality(client->adapter,
1201 I2C_FUNC_SMBUS_BYTE_DATA |
1202 I2C_FUNC_SMBUS_BLOCK_DATA |
1203 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1204 transport_ops = &elan_smbus_ops;
1205 } else {
1206 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1207 return -EIO;
1208 }
1209
1210 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1211 if (!data)
1212 return -ENOMEM;
1213
1214 i2c_set_clientdata(client, data);
1215
1216 data->ops = transport_ops;
1217 data->client = client;
1218 init_completion(&data->fw_completion);
1219 mutex_init(&data->sysfs_mutex);
1220
1221 data->vcc = devm_regulator_get(dev, "vcc");
1222 if (IS_ERR(data->vcc)) {
1223 error = PTR_ERR(data->vcc);
1224 if (error != -EPROBE_DEFER)
1225 dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1226 error);
1227 return error;
1228 }
1229
1230 error = regulator_enable(data->vcc);
1231 if (error) {
1232 dev_err(dev, "Failed to enable regulator: %d\n", error);
1233 return error;
1234 }
1235
1236 error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1237 if (error) {
1238 dev_err(dev, "Failed to add disable regulator action: %d\n",
1239 error);
1240 return error;
1241 }
1242
1243 /* Make sure there is something at this address */
1244 error = i2c_smbus_read_byte(client);
1245 if (error < 0) {
1246 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1247 return -ENXIO;
1248 }
1249
1250 /* Initialize the touchpad. */
1251 error = elan_initialize(data);
1252 if (error)
1253 return error;
1254
1255 error = elan_query_device_info(data);
1256 if (error)
1257 return error;
1258
1259 error = elan_query_device_parameters(data);
1260 if (error)
1261 return error;
1262
1263 dev_info(dev,
1264 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1265 data->product_id,
1266 data->fw_version,
1267 data->sm_version,
1268 data->iap_version);
1269
1270 dev_dbg(dev,
1271 "Elan Touchpad Extra Information:\n"
1272 " Max ABS X,Y: %d,%d\n"
1273 " Width X,Y: %d,%d\n"
1274 " Resolution X,Y: %d,%d (dots/mm)\n"
1275 " ic type: 0x%x\n"
1276 " info pattern: 0x%x\n",
1277 data->max_x, data->max_y,
1278 data->width_x, data->width_y,
1279 data->x_res, data->y_res,
1280 data->ic_type, data->pattern);
1281
1282 /* Set up input device properties based on queried parameters. */
1283 error = elan_setup_input_device(data);
1284 if (error)
1285 return error;
1286
1287 if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1288 error = elan_setup_trackpoint_input_device(data);
1289 if (error)
1290 return error;
1291 }
1292
1293 /*
1294 * Platform code (ACPI, DTS) should normally set up interrupt
1295 * for us, but in case it did not let's fall back to using falling
1296 * edge to be compatible with older Chromebooks.
1297 */
1298 irqflags = irq_get_trigger_type(client->irq);
1299 if (!irqflags)
1300 irqflags = IRQF_TRIGGER_FALLING;
1301
1302 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1303 irqflags | IRQF_ONESHOT,
1304 client->name, data);
1305 if (error) {
1306 dev_err(dev, "cannot register irq=%d\n", client->irq);
1307 return error;
1308 }
1309
1310 error = devm_device_add_groups(dev, elan_sysfs_groups);
1311 if (error) {
1312 dev_err(dev, "failed to create sysfs attributes: %d\n", error);
1313 return error;
1314 }
1315
1316 error = input_register_device(data->input);
1317 if (error) {
1318 dev_err(dev, "failed to register input device: %d\n", error);
1319 return error;
1320 }
1321
1322 if (data->tp_input) {
1323 error = input_register_device(data->tp_input);
1324 if (error) {
1325 dev_err(&client->dev,
1326 "failed to register TrackPoint input device: %d\n",
1327 error);
1328 return error;
1329 }
1330 }
1331
1332 /*
1333 * Systems using device tree should set up wakeup via DTS,
1334 * the rest will configure device as wakeup source by default.
1335 */
1336 if (!dev->of_node)
1337 device_init_wakeup(dev, true);
1338
1339 return 0;
1340 }
1341
elan_suspend(struct device * dev)1342 static int __maybe_unused elan_suspend(struct device *dev)
1343 {
1344 struct i2c_client *client = to_i2c_client(dev);
1345 struct elan_tp_data *data = i2c_get_clientdata(client);
1346 int ret;
1347
1348 /*
1349 * We are taking the mutex to make sure sysfs operations are
1350 * complete before we attempt to bring the device into low[er]
1351 * power mode.
1352 */
1353 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1354 if (ret)
1355 return ret;
1356
1357 disable_irq(client->irq);
1358
1359 if (device_may_wakeup(dev)) {
1360 ret = elan_sleep(data);
1361 /* Enable wake from IRQ */
1362 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1363 } else {
1364 ret = elan_disable_power(data);
1365 }
1366
1367 mutex_unlock(&data->sysfs_mutex);
1368 return ret;
1369 }
1370
elan_resume(struct device * dev)1371 static int __maybe_unused elan_resume(struct device *dev)
1372 {
1373 struct i2c_client *client = to_i2c_client(dev);
1374 struct elan_tp_data *data = i2c_get_clientdata(client);
1375 int error;
1376
1377 if (device_may_wakeup(dev) && data->irq_wake) {
1378 disable_irq_wake(client->irq);
1379 data->irq_wake = false;
1380 }
1381
1382 error = elan_enable_power(data);
1383 if (error) {
1384 dev_err(dev, "power up when resuming failed: %d\n", error);
1385 goto err;
1386 }
1387
1388 error = elan_initialize(data);
1389 if (error)
1390 dev_err(dev, "initialize when resuming failed: %d\n", error);
1391
1392 err:
1393 enable_irq(data->client->irq);
1394 return error;
1395 }
1396
1397 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1398
1399 static const struct i2c_device_id elan_id[] = {
1400 { DRIVER_NAME, 0 },
1401 { },
1402 };
1403 MODULE_DEVICE_TABLE(i2c, elan_id);
1404
1405 #ifdef CONFIG_ACPI
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");
1434