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/pm_wakeirq.h>
37 #include <linux/property.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 /* quirks to control the device */
51 #define ETP_QUIRK_QUICK_WAKEUP BIT(0)
52
53 /* The main device structure */
54 struct elan_tp_data {
55 struct i2c_client *client;
56 struct input_dev *input;
57 struct input_dev *tp_input; /* trackpoint input node */
58 struct regulator *vcc;
59
60 const struct elan_transport_ops *ops;
61
62 /* for fw update */
63 struct completion fw_completion;
64 bool in_fw_update;
65
66 struct mutex sysfs_mutex;
67
68 unsigned int max_x;
69 unsigned int max_y;
70 unsigned int width_x;
71 unsigned int width_y;
72 unsigned int x_res;
73 unsigned int y_res;
74
75 u8 pattern;
76 u16 product_id;
77 u8 fw_version;
78 u8 sm_version;
79 u8 iap_version;
80 u16 fw_checksum;
81 unsigned int report_features;
82 unsigned int report_len;
83 int pressure_adjustment;
84 u8 mode;
85 u16 ic_type;
86 u16 fw_validpage_count;
87 u16 fw_page_size;
88 u32 fw_signature_address;
89
90 u8 min_baseline;
91 u8 max_baseline;
92 bool baseline_ready;
93 u8 clickpad;
94 bool middle_button;
95
96 u32 quirks; /* Various quirks */
97 };
98
elan_i2c_lookup_quirks(u16 ic_type,u16 product_id)99 static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
100 {
101 static const struct {
102 u16 ic_type;
103 u16 product_id;
104 u32 quirks;
105 } elan_i2c_quirks[] = {
106 { 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
107 { 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
108 { 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
109 { 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
110 { 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
111 };
112 u32 quirks = 0;
113 int i;
114
115 for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
116 if (elan_i2c_quirks[i].ic_type == ic_type &&
117 elan_i2c_quirks[i].product_id == product_id) {
118 quirks = elan_i2c_quirks[i].quirks;
119 }
120 }
121
122 if (ic_type >= 0x0D && product_id >= 0x123)
123 quirks |= ETP_QUIRK_QUICK_WAKEUP;
124
125 return quirks;
126 }
127
elan_get_fwinfo(u16 ic_type,u8 iap_version,u16 * validpage_count,u32 * signature_address,u16 * page_size)128 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
129 u32 *signature_address, u16 *page_size)
130 {
131 switch (ic_type) {
132 case 0x00:
133 case 0x06:
134 case 0x08:
135 *validpage_count = 512;
136 break;
137 case 0x03:
138 case 0x07:
139 case 0x09:
140 case 0x0A:
141 case 0x0B:
142 case 0x0C:
143 *validpage_count = 768;
144 break;
145 case 0x0D:
146 *validpage_count = 896;
147 break;
148 case 0x0E:
149 *validpage_count = 640;
150 break;
151 case 0x10:
152 *validpage_count = 1024;
153 break;
154 case 0x11:
155 *validpage_count = 1280;
156 break;
157 case 0x13:
158 *validpage_count = 2048;
159 break;
160 case 0x14:
161 case 0x15:
162 *validpage_count = 1024;
163 break;
164 default:
165 /* unknown ic type clear value */
166 *validpage_count = 0;
167 *signature_address = 0;
168 *page_size = 0;
169 return -ENXIO;
170 }
171
172 *signature_address =
173 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
174
175 if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
176 *validpage_count /= 8;
177 *page_size = ETP_FW_PAGE_SIZE_512;
178 } else if (ic_type >= 0x0D && iap_version >= 1) {
179 *validpage_count /= 2;
180 *page_size = ETP_FW_PAGE_SIZE_128;
181 } else {
182 *page_size = ETP_FW_PAGE_SIZE;
183 }
184
185 return 0;
186 }
187
elan_set_power(struct elan_tp_data * data,bool on)188 static int elan_set_power(struct elan_tp_data *data, bool on)
189 {
190 int repeat = ETP_RETRY_COUNT;
191 int error;
192
193 do {
194 error = data->ops->power_control(data->client, on);
195 if (error >= 0)
196 return 0;
197
198 msleep(30);
199 } while (--repeat > 0);
200
201 dev_err(&data->client->dev, "failed to set power %s: %d\n",
202 on ? "on" : "off", error);
203 return error;
204 }
205
elan_sleep(struct elan_tp_data * data)206 static int elan_sleep(struct elan_tp_data *data)
207 {
208 int repeat = ETP_RETRY_COUNT;
209 int error;
210
211 do {
212 error = data->ops->sleep_control(data->client, true);
213 if (!error)
214 return 0;
215
216 msleep(30);
217 } while (--repeat > 0);
218
219 return error;
220 }
221
elan_query_product(struct elan_tp_data * data)222 static int elan_query_product(struct elan_tp_data *data)
223 {
224 int error;
225
226 error = data->ops->get_product_id(data->client, &data->product_id);
227 if (error)
228 return error;
229
230 error = data->ops->get_pattern(data->client, &data->pattern);
231 if (error)
232 return error;
233
234 error = data->ops->get_sm_version(data->client, data->pattern,
235 &data->ic_type, &data->sm_version,
236 &data->clickpad);
237 if (error)
238 return error;
239
240 return 0;
241 }
242
elan_check_ASUS_special_fw(struct elan_tp_data * data)243 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
244 {
245 if (data->ic_type == 0x0E) {
246 switch (data->product_id) {
247 case 0x05 ... 0x07:
248 case 0x09:
249 case 0x13:
250 return true;
251 }
252 } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
253 /* ASUS EeeBook X205TA */
254 return true;
255 }
256
257 return false;
258 }
259
__elan_initialize(struct elan_tp_data * data,bool skip_reset)260 static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
261 {
262 struct i2c_client *client = data->client;
263 bool woken_up = false;
264 int error;
265
266 if (!skip_reset) {
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
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,bool skip_reset)315 static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
316 {
317 int repeat = ETP_RETRY_COUNT;
318 int error;
319
320 do {
321 error = __elan_initialize(data, skip_reset);
322 if (!error)
323 return 0;
324
325 skip_reset = false;
326 msleep(30);
327 } while (--repeat > 0);
328
329 return error;
330 }
331
elan_query_device_info(struct elan_tp_data * data)332 static int elan_query_device_info(struct elan_tp_data *data)
333 {
334 int error;
335
336 error = data->ops->get_version(data->client, data->pattern, false,
337 &data->fw_version);
338 if (error)
339 return error;
340
341 error = data->ops->get_checksum(data->client, false,
342 &data->fw_checksum);
343 if (error)
344 return error;
345
346 error = data->ops->get_version(data->client, data->pattern,
347 true, &data->iap_version);
348 if (error)
349 return error;
350
351 error = data->ops->get_pressure_adjustment(data->client,
352 &data->pressure_adjustment);
353 if (error)
354 return error;
355
356 error = data->ops->get_report_features(data->client, data->pattern,
357 &data->report_features,
358 &data->report_len);
359 if (error)
360 return error;
361
362 data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
363
364 error = elan_get_fwinfo(data->ic_type, data->iap_version,
365 &data->fw_validpage_count,
366 &data->fw_signature_address,
367 &data->fw_page_size);
368 if (error)
369 dev_warn(&data->client->dev,
370 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
371 data->iap_version, data->ic_type);
372
373 return 0;
374 }
375
elan_convert_resolution(u8 val,u8 pattern)376 static unsigned int elan_convert_resolution(u8 val, u8 pattern)
377 {
378 /*
379 * pattern <= 0x01:
380 * (value from firmware) * 10 + 790 = dpi
381 * else
382 * ((value from firmware) + 3) * 100 = dpi
383 */
384 int res = pattern <= 0x01 ?
385 (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
386 /*
387 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
388 * point).
389 */
390 return res * 10 / 254;
391 }
392
elan_query_device_parameters(struct elan_tp_data * data)393 static int elan_query_device_parameters(struct elan_tp_data *data)
394 {
395 struct i2c_client *client = data->client;
396 unsigned int x_traces, y_traces;
397 u32 x_mm, y_mm;
398 u8 hw_x_res, hw_y_res;
399 int error;
400
401 if (device_property_read_u32(&client->dev,
402 "touchscreen-size-x", &data->max_x) ||
403 device_property_read_u32(&client->dev,
404 "touchscreen-size-y", &data->max_y)) {
405 error = data->ops->get_max(data->client,
406 &data->max_x,
407 &data->max_y);
408 if (error)
409 return error;
410 } else {
411 /* size is the maximum + 1 */
412 --data->max_x;
413 --data->max_y;
414 }
415
416 if (device_property_read_u32(&client->dev,
417 "elan,x_traces",
418 &x_traces) ||
419 device_property_read_u32(&client->dev,
420 "elan,y_traces",
421 &y_traces)) {
422 error = data->ops->get_num_traces(data->client,
423 &x_traces, &y_traces);
424 if (error)
425 return error;
426 }
427 data->width_x = data->max_x / x_traces;
428 data->width_y = data->max_y / y_traces;
429
430 if (device_property_read_u32(&client->dev,
431 "touchscreen-x-mm", &x_mm) ||
432 device_property_read_u32(&client->dev,
433 "touchscreen-y-mm", &y_mm)) {
434 error = data->ops->get_resolution(data->client,
435 &hw_x_res, &hw_y_res);
436 if (error)
437 return error;
438
439 data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
440 data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
441 } else {
442 data->x_res = (data->max_x + 1) / x_mm;
443 data->y_res = (data->max_y + 1) / y_mm;
444 }
445
446 if (device_property_read_bool(&client->dev, "elan,clickpad"))
447 data->clickpad = 1;
448
449 if (device_property_read_bool(&client->dev, "elan,middle-button"))
450 data->middle_button = true;
451
452 return 0;
453 }
454
455 /*
456 **********************************************************
457 * IAP firmware updater related routines
458 **********************************************************
459 */
elan_write_fw_block(struct elan_tp_data * data,u16 page_size,const u8 * page,u16 checksum,int idx)460 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
461 const u8 *page, u16 checksum, int idx)
462 {
463 int retry = ETP_RETRY_COUNT;
464 int error;
465
466 do {
467 error = data->ops->write_fw_block(data->client, page_size,
468 page, checksum, idx);
469 if (!error)
470 return 0;
471
472 dev_dbg(&data->client->dev,
473 "IAP retrying page %d (error: %d)\n", idx, error);
474 } while (--retry > 0);
475
476 return error;
477 }
478
__elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)479 static int __elan_update_firmware(struct elan_tp_data *data,
480 const struct firmware *fw)
481 {
482 struct i2c_client *client = data->client;
483 struct device *dev = &client->dev;
484 int i, j;
485 int error;
486 u16 iap_start_addr;
487 u16 boot_page_count;
488 u16 sw_checksum = 0, fw_checksum = 0;
489
490 error = data->ops->prepare_fw_update(client, data->ic_type,
491 data->iap_version,
492 data->fw_page_size);
493 if (error)
494 return error;
495
496 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
497
498 boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
499 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
500 u16 checksum = 0;
501 const u8 *page = &fw->data[i * data->fw_page_size];
502
503 for (j = 0; j < data->fw_page_size; j += 2)
504 checksum += ((page[j + 1] << 8) | page[j]);
505
506 error = elan_write_fw_block(data, data->fw_page_size,
507 page, checksum, i);
508 if (error) {
509 dev_err(dev, "write page %d fail: %d\n", i, error);
510 return error;
511 }
512
513 sw_checksum += checksum;
514 }
515
516 /* Wait WDT reset and power on reset */
517 msleep(600);
518
519 error = data->ops->finish_fw_update(client, &data->fw_completion);
520 if (error)
521 return error;
522
523 error = data->ops->get_checksum(client, true, &fw_checksum);
524 if (error)
525 return error;
526
527 if (sw_checksum != fw_checksum) {
528 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
529 sw_checksum, fw_checksum);
530 return -EIO;
531 }
532
533 return 0;
534 }
535
elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)536 static int elan_update_firmware(struct elan_tp_data *data,
537 const struct firmware *fw)
538 {
539 struct i2c_client *client = data->client;
540 int retval;
541
542 dev_dbg(&client->dev, "Starting firmware update....\n");
543
544 disable_irq(client->irq);
545 data->in_fw_update = true;
546
547 retval = __elan_update_firmware(data, fw);
548 if (retval) {
549 dev_err(&client->dev, "firmware update failed: %d\n", retval);
550 data->ops->iap_reset(client);
551 } else {
552 /* Reinitialize TP after fw is updated */
553 elan_initialize(data, false);
554 elan_query_device_info(data);
555 }
556
557 data->in_fw_update = false;
558 enable_irq(client->irq);
559
560 return retval;
561 }
562
563 /*
564 *******************************************************************
565 * SYSFS attributes
566 *******************************************************************
567 */
elan_sysfs_read_fw_checksum(struct device * dev,struct device_attribute * attr,char * buf)568 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
569 struct device_attribute *attr,
570 char *buf)
571 {
572 struct i2c_client *client = to_i2c_client(dev);
573 struct elan_tp_data *data = i2c_get_clientdata(client);
574
575 return sprintf(buf, "0x%04x\n", data->fw_checksum);
576 }
577
elan_sysfs_read_product_id(struct device * dev,struct device_attribute * attr,char * buf)578 static ssize_t elan_sysfs_read_product_id(struct device *dev,
579 struct device_attribute *attr,
580 char *buf)
581 {
582 struct i2c_client *client = to_i2c_client(dev);
583 struct elan_tp_data *data = i2c_get_clientdata(client);
584
585 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
586 data->product_id);
587 }
588
elan_sysfs_read_fw_ver(struct device * dev,struct device_attribute * attr,char * buf)589 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
590 struct device_attribute *attr,
591 char *buf)
592 {
593 struct i2c_client *client = to_i2c_client(dev);
594 struct elan_tp_data *data = i2c_get_clientdata(client);
595
596 return sprintf(buf, "%d.0\n", data->fw_version);
597 }
598
elan_sysfs_read_sm_ver(struct device * dev,struct device_attribute * attr,char * buf)599 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
600 struct device_attribute *attr,
601 char *buf)
602 {
603 struct i2c_client *client = to_i2c_client(dev);
604 struct elan_tp_data *data = i2c_get_clientdata(client);
605
606 return sprintf(buf, "%d.0\n", data->sm_version);
607 }
608
elan_sysfs_read_iap_ver(struct device * dev,struct device_attribute * attr,char * buf)609 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
610 struct device_attribute *attr,
611 char *buf)
612 {
613 struct i2c_client *client = to_i2c_client(dev);
614 struct elan_tp_data *data = i2c_get_clientdata(client);
615
616 return sprintf(buf, "%d.0\n", data->iap_version);
617 }
618
elan_sysfs_update_fw(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)619 static ssize_t elan_sysfs_update_fw(struct device *dev,
620 struct device_attribute *attr,
621 const char *buf, size_t count)
622 {
623 struct elan_tp_data *data = dev_get_drvdata(dev);
624 const struct firmware *fw;
625 char *fw_name;
626 int error;
627 const u8 *fw_signature;
628 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
629
630 if (data->fw_validpage_count == 0)
631 return -EINVAL;
632
633 /* Look for a firmware with the product id appended. */
634 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
635 if (!fw_name) {
636 dev_err(dev, "failed to allocate memory for firmware name\n");
637 return -ENOMEM;
638 }
639
640 dev_info(dev, "requesting fw '%s'\n", fw_name);
641 error = request_firmware(&fw, fw_name, dev);
642 kfree(fw_name);
643 if (error) {
644 dev_err(dev, "failed to request firmware: %d\n", error);
645 return error;
646 }
647
648 /* Firmware file must match signature data */
649 fw_signature = &fw->data[data->fw_signature_address];
650 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
651 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
652 (int)sizeof(signature), signature,
653 (int)sizeof(signature), fw_signature);
654 error = -EBADF;
655 goto out_release_fw;
656 }
657
658 error = mutex_lock_interruptible(&data->sysfs_mutex);
659 if (error)
660 goto out_release_fw;
661
662 error = elan_update_firmware(data, fw);
663
664 mutex_unlock(&data->sysfs_mutex);
665
666 out_release_fw:
667 release_firmware(fw);
668 return error ?: count;
669 }
670
calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)671 static ssize_t calibrate_store(struct device *dev,
672 struct device_attribute *attr,
673 const char *buf, size_t count)
674 {
675 struct i2c_client *client = to_i2c_client(dev);
676 struct elan_tp_data *data = i2c_get_clientdata(client);
677 int tries = 20;
678 int retval;
679 int error;
680 u8 val[ETP_CALIBRATE_MAX_LEN];
681
682 retval = mutex_lock_interruptible(&data->sysfs_mutex);
683 if (retval)
684 return retval;
685
686 disable_irq(client->irq);
687
688 data->mode |= ETP_ENABLE_CALIBRATE;
689 retval = data->ops->set_mode(client, data->mode);
690 if (retval) {
691 dev_err(dev, "failed to enable calibration mode: %d\n",
692 retval);
693 goto out;
694 }
695
696 retval = data->ops->calibrate(client);
697 if (retval) {
698 dev_err(dev, "failed to start calibration: %d\n",
699 retval);
700 goto out_disable_calibrate;
701 }
702
703 val[0] = 0xff;
704 do {
705 /* Wait 250ms before checking if calibration has completed. */
706 msleep(250);
707
708 retval = data->ops->calibrate_result(client, val);
709 if (retval)
710 dev_err(dev, "failed to check calibration result: %d\n",
711 retval);
712 else if (val[0] == 0)
713 break; /* calibration done */
714
715 } while (--tries);
716
717 if (tries == 0) {
718 dev_err(dev, "failed to calibrate. Timeout.\n");
719 retval = -ETIMEDOUT;
720 }
721
722 out_disable_calibrate:
723 data->mode &= ~ETP_ENABLE_CALIBRATE;
724 error = data->ops->set_mode(data->client, data->mode);
725 if (error) {
726 dev_err(dev, "failed to disable calibration mode: %d\n",
727 error);
728 if (!retval)
729 retval = error;
730 }
731 out:
732 enable_irq(client->irq);
733 mutex_unlock(&data->sysfs_mutex);
734 return retval ?: count;
735 }
736
elan_sysfs_read_mode(struct device * dev,struct device_attribute * attr,char * buf)737 static ssize_t elan_sysfs_read_mode(struct device *dev,
738 struct device_attribute *attr,
739 char *buf)
740 {
741 struct i2c_client *client = to_i2c_client(dev);
742 struct elan_tp_data *data = i2c_get_clientdata(client);
743 int error;
744 enum tp_mode mode;
745
746 error = mutex_lock_interruptible(&data->sysfs_mutex);
747 if (error)
748 return error;
749
750 error = data->ops->iap_get_mode(data->client, &mode);
751
752 mutex_unlock(&data->sysfs_mutex);
753
754 if (error)
755 return error;
756
757 return sprintf(buf, "%d\n", (int)mode);
758 }
759
760 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
761 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
762 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
763 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
764 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
765 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
766 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
767
768 static DEVICE_ATTR_WO(calibrate);
769
770 static struct attribute *elan_sysfs_entries[] = {
771 &dev_attr_product_id.attr,
772 &dev_attr_firmware_version.attr,
773 &dev_attr_sample_version.attr,
774 &dev_attr_iap_version.attr,
775 &dev_attr_fw_checksum.attr,
776 &dev_attr_calibrate.attr,
777 &dev_attr_mode.attr,
778 &dev_attr_update_fw.attr,
779 NULL,
780 };
781
782 static const struct attribute_group elan_sysfs_group = {
783 .attrs = elan_sysfs_entries,
784 };
785
acquire_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)786 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
787 const char *buf, size_t count)
788 {
789 struct i2c_client *client = to_i2c_client(dev);
790 struct elan_tp_data *data = i2c_get_clientdata(client);
791 int error;
792 int retval;
793
794 retval = mutex_lock_interruptible(&data->sysfs_mutex);
795 if (retval)
796 return retval;
797
798 disable_irq(client->irq);
799
800 data->baseline_ready = false;
801
802 data->mode |= ETP_ENABLE_CALIBRATE;
803 retval = data->ops->set_mode(data->client, data->mode);
804 if (retval) {
805 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
806 retval);
807 goto out;
808 }
809
810 msleep(250);
811
812 retval = data->ops->get_baseline_data(data->client, true,
813 &data->max_baseline);
814 if (retval) {
815 dev_err(dev, "Failed to read max baseline form device: %d\n",
816 retval);
817 goto out_disable_calibrate;
818 }
819
820 retval = data->ops->get_baseline_data(data->client, false,
821 &data->min_baseline);
822 if (retval) {
823 dev_err(dev, "Failed to read min baseline form device: %d\n",
824 retval);
825 goto out_disable_calibrate;
826 }
827
828 data->baseline_ready = true;
829
830 out_disable_calibrate:
831 data->mode &= ~ETP_ENABLE_CALIBRATE;
832 error = data->ops->set_mode(data->client, data->mode);
833 if (error) {
834 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
835 error);
836 if (!retval)
837 retval = error;
838 }
839 out:
840 enable_irq(client->irq);
841 mutex_unlock(&data->sysfs_mutex);
842 return retval ?: count;
843 }
844
min_show(struct device * dev,struct device_attribute * attr,char * buf)845 static ssize_t min_show(struct device *dev,
846 struct device_attribute *attr, char *buf)
847 {
848 struct i2c_client *client = to_i2c_client(dev);
849 struct elan_tp_data *data = i2c_get_clientdata(client);
850 int retval;
851
852 retval = mutex_lock_interruptible(&data->sysfs_mutex);
853 if (retval)
854 return retval;
855
856 if (!data->baseline_ready) {
857 retval = -ENODATA;
858 goto out;
859 }
860
861 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
862
863 out:
864 mutex_unlock(&data->sysfs_mutex);
865 return retval;
866 }
867
max_show(struct device * dev,struct device_attribute * attr,char * buf)868 static ssize_t max_show(struct device *dev,
869 struct device_attribute *attr, char *buf)
870 {
871 struct i2c_client *client = to_i2c_client(dev);
872 struct elan_tp_data *data = i2c_get_clientdata(client);
873 int retval;
874
875 retval = mutex_lock_interruptible(&data->sysfs_mutex);
876 if (retval)
877 return retval;
878
879 if (!data->baseline_ready) {
880 retval = -ENODATA;
881 goto out;
882 }
883
884 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
885
886 out:
887 mutex_unlock(&data->sysfs_mutex);
888 return retval;
889 }
890
891
892 static DEVICE_ATTR_WO(acquire);
893 static DEVICE_ATTR_RO(min);
894 static DEVICE_ATTR_RO(max);
895
896 static struct attribute *elan_baseline_sysfs_entries[] = {
897 &dev_attr_acquire.attr,
898 &dev_attr_min.attr,
899 &dev_attr_max.attr,
900 NULL,
901 };
902
903 static const struct attribute_group elan_baseline_sysfs_group = {
904 .name = "baseline",
905 .attrs = elan_baseline_sysfs_entries,
906 };
907
908 static const struct attribute_group *elan_sysfs_groups[] = {
909 &elan_sysfs_group,
910 &elan_baseline_sysfs_group,
911 NULL
912 };
913
914 /*
915 ******************************************************************
916 * Elan isr functions
917 ******************************************************************
918 */
elan_report_contact(struct elan_tp_data * data,int contact_num,bool contact_valid,bool high_precision,u8 * packet,u8 * finger_data)919 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
920 bool contact_valid, bool high_precision,
921 u8 *packet, u8 *finger_data)
922 {
923 struct input_dev *input = data->input;
924 unsigned int pos_x, pos_y;
925 unsigned int pressure, scaled_pressure;
926
927 if (contact_valid) {
928 if (high_precision) {
929 pos_x = get_unaligned_be16(&finger_data[0]);
930 pos_y = get_unaligned_be16(&finger_data[2]);
931 } else {
932 pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
933 pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
934 }
935
936 if (pos_x > data->max_x || pos_y > data->max_y) {
937 dev_dbg(input->dev.parent,
938 "[%d] x=%d y=%d over max (%d, %d)",
939 contact_num, pos_x, pos_y,
940 data->max_x, data->max_y);
941 return;
942 }
943
944 pressure = finger_data[4];
945 scaled_pressure = pressure + data->pressure_adjustment;
946 if (scaled_pressure > ETP_MAX_PRESSURE)
947 scaled_pressure = ETP_MAX_PRESSURE;
948
949 input_mt_slot(input, contact_num);
950 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
951 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
952 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
953 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
954
955 if (data->report_features & ETP_FEATURE_REPORT_MK) {
956 unsigned int mk_x, mk_y, area_x, area_y;
957 u8 mk_data = high_precision ?
958 packet[ETP_MK_DATA_OFFSET + contact_num] :
959 finger_data[3];
960
961 mk_x = mk_data & 0x0f;
962 mk_y = mk_data >> 4;
963
964 /*
965 * To avoid treating large finger as palm, let's reduce
966 * the width x and y per trace.
967 */
968 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
969 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
970
971 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
972 input_report_abs(input, ABS_MT_TOUCH_MAJOR,
973 max(area_x, area_y));
974 input_report_abs(input, ABS_MT_TOUCH_MINOR,
975 min(area_x, area_y));
976 }
977 } else {
978 input_mt_slot(input, contact_num);
979 input_mt_report_slot_inactive(input);
980 }
981 }
982
elan_report_absolute(struct elan_tp_data * data,u8 * packet,bool high_precision)983 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
984 bool high_precision)
985 {
986 struct input_dev *input = data->input;
987 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
988 int i;
989 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
990 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
991 bool contact_valid, hover_event;
992
993 pm_wakeup_event(&data->client->dev, 0);
994
995 hover_event = hover_info & BIT(6);
996
997 for (i = 0; i < ETP_MAX_FINGERS; i++) {
998 contact_valid = tp_info & BIT(3 + i);
999 elan_report_contact(data, i, contact_valid, high_precision,
1000 packet, finger_data);
1001 if (contact_valid)
1002 finger_data += ETP_FINGER_DATA_LEN;
1003 }
1004
1005 input_report_key(input, BTN_LEFT, tp_info & BIT(0));
1006 input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1007 input_report_key(input, BTN_RIGHT, tp_info & BIT(1));
1008 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1009 input_mt_report_pointer_emulation(input, true);
1010 input_sync(input);
1011 }
1012
elan_report_trackpoint(struct elan_tp_data * data,u8 * report)1013 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1014 {
1015 struct input_dev *input = data->tp_input;
1016 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1017 int x, y;
1018
1019 pm_wakeup_event(&data->client->dev, 0);
1020
1021 if (!data->tp_input) {
1022 dev_warn_once(&data->client->dev,
1023 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1024 return;
1025 }
1026
1027 input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1028 input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1029 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1030
1031 if ((packet[3] & 0x0F) == 0x06) {
1032 x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1033 y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1034
1035 input_report_rel(input, REL_X, x);
1036 input_report_rel(input, REL_Y, y);
1037 }
1038
1039 input_sync(input);
1040 }
1041
elan_isr(int irq,void * dev_id)1042 static irqreturn_t elan_isr(int irq, void *dev_id)
1043 {
1044 struct elan_tp_data *data = dev_id;
1045 int error;
1046 u8 report[ETP_MAX_REPORT_LEN];
1047
1048 /*
1049 * When device is connected to i2c bus, when all IAP page writes
1050 * complete, the driver will receive interrupt and must read
1051 * 0000 to confirm that IAP is finished.
1052 */
1053 if (data->in_fw_update) {
1054 complete(&data->fw_completion);
1055 goto out;
1056 }
1057
1058 error = data->ops->get_report(data->client, report, data->report_len);
1059 if (error)
1060 goto out;
1061
1062 switch (report[ETP_REPORT_ID_OFFSET]) {
1063 case ETP_REPORT_ID:
1064 elan_report_absolute(data, report, false);
1065 break;
1066 case ETP_REPORT_ID2:
1067 elan_report_absolute(data, report, true);
1068 break;
1069 case ETP_TP_REPORT_ID:
1070 case ETP_TP_REPORT_ID2:
1071 elan_report_trackpoint(data, report);
1072 break;
1073 default:
1074 dev_err(&data->client->dev, "invalid report id data (%x)\n",
1075 report[ETP_REPORT_ID_OFFSET]);
1076 }
1077
1078 out:
1079 return IRQ_HANDLED;
1080 }
1081
1082 /*
1083 ******************************************************************
1084 * Elan initialization functions
1085 ******************************************************************
1086 */
1087
elan_setup_trackpoint_input_device(struct elan_tp_data * data)1088 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1089 {
1090 struct device *dev = &data->client->dev;
1091 struct input_dev *input;
1092
1093 input = devm_input_allocate_device(dev);
1094 if (!input)
1095 return -ENOMEM;
1096
1097 input->name = "Elan TrackPoint";
1098 input->id.bustype = BUS_I2C;
1099 input->id.vendor = ELAN_VENDOR_ID;
1100 input->id.product = data->product_id;
1101 input_set_drvdata(input, data);
1102
1103 input_set_capability(input, EV_REL, REL_X);
1104 input_set_capability(input, EV_REL, REL_Y);
1105 input_set_capability(input, EV_KEY, BTN_LEFT);
1106 input_set_capability(input, EV_KEY, BTN_RIGHT);
1107 input_set_capability(input, EV_KEY, BTN_MIDDLE);
1108
1109 __set_bit(INPUT_PROP_POINTER, input->propbit);
1110 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1111
1112 data->tp_input = input;
1113
1114 return 0;
1115 }
1116
elan_setup_input_device(struct elan_tp_data * data)1117 static int elan_setup_input_device(struct elan_tp_data *data)
1118 {
1119 struct device *dev = &data->client->dev;
1120 struct input_dev *input;
1121 unsigned int max_width = max(data->width_x, data->width_y);
1122 unsigned int min_width = min(data->width_x, data->width_y);
1123 int error;
1124
1125 input = devm_input_allocate_device(dev);
1126 if (!input)
1127 return -ENOMEM;
1128
1129 input->name = "Elan Touchpad";
1130 input->id.bustype = BUS_I2C;
1131 input->id.vendor = ELAN_VENDOR_ID;
1132 input->id.product = data->product_id;
1133 input_set_drvdata(input, data);
1134
1135 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1136 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1137 if (error) {
1138 dev_err(dev, "failed to initialize MT slots: %d\n", error);
1139 return error;
1140 }
1141
1142 __set_bit(EV_ABS, input->evbit);
1143 __set_bit(INPUT_PROP_POINTER, input->propbit);
1144 if (data->clickpad) {
1145 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1146 } else {
1147 __set_bit(BTN_RIGHT, input->keybit);
1148 if (data->middle_button)
1149 __set_bit(BTN_MIDDLE, input->keybit);
1150 }
1151 __set_bit(BTN_LEFT, input->keybit);
1152
1153 /* Set up ST parameters */
1154 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1155 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1156 input_abs_set_res(input, ABS_X, data->x_res);
1157 input_abs_set_res(input, ABS_Y, data->y_res);
1158 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1159 if (data->report_features & ETP_FEATURE_REPORT_MK)
1160 input_set_abs_params(input, ABS_TOOL_WIDTH,
1161 0, ETP_FINGER_WIDTH, 0, 0);
1162 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1163
1164 /* And MT parameters */
1165 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1166 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1167 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1168 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1169 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1170 ETP_MAX_PRESSURE, 0, 0);
1171 if (data->report_features & ETP_FEATURE_REPORT_MK) {
1172 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1173 0, ETP_FINGER_WIDTH * max_width, 0, 0);
1174 input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1175 0, ETP_FINGER_WIDTH * min_width, 0, 0);
1176 }
1177
1178 data->input = input;
1179
1180 return 0;
1181 }
1182
elan_disable_regulator(void * _data)1183 static void elan_disable_regulator(void *_data)
1184 {
1185 struct elan_tp_data *data = _data;
1186
1187 regulator_disable(data->vcc);
1188 }
1189
elan_probe(struct i2c_client * client)1190 static int elan_probe(struct i2c_client *client)
1191 {
1192 const struct elan_transport_ops *transport_ops;
1193 struct device *dev = &client->dev;
1194 struct elan_tp_data *data;
1195 unsigned long irqflags;
1196 int error;
1197
1198 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1199 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1200 transport_ops = &elan_i2c_ops;
1201 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1202 i2c_check_functionality(client->adapter,
1203 I2C_FUNC_SMBUS_BYTE_DATA |
1204 I2C_FUNC_SMBUS_BLOCK_DATA |
1205 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1206 transport_ops = &elan_smbus_ops;
1207 } else {
1208 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1209 return -EIO;
1210 }
1211
1212 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1213 if (!data)
1214 return -ENOMEM;
1215
1216 i2c_set_clientdata(client, data);
1217
1218 data->ops = transport_ops;
1219 data->client = client;
1220 init_completion(&data->fw_completion);
1221 mutex_init(&data->sysfs_mutex);
1222
1223 data->vcc = devm_regulator_get(dev, "vcc");
1224 if (IS_ERR(data->vcc))
1225 return dev_err_probe(dev, PTR_ERR(data->vcc), "Failed to get 'vcc' regulator\n");
1226
1227 error = regulator_enable(data->vcc);
1228 if (error) {
1229 dev_err(dev, "Failed to enable regulator: %d\n", error);
1230 return error;
1231 }
1232
1233 error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1234 if (error) {
1235 dev_err(dev, "Failed to add disable regulator action: %d\n",
1236 error);
1237 return error;
1238 }
1239
1240 /* Make sure there is something at this address */
1241 error = i2c_smbus_read_byte(client);
1242 if (error < 0) {
1243 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1244 return -ENXIO;
1245 }
1246
1247 /* Initialize the touchpad. */
1248 error = elan_initialize(data, false);
1249 if (error)
1250 return error;
1251
1252 error = elan_query_device_info(data);
1253 if (error)
1254 return error;
1255
1256 error = elan_query_device_parameters(data);
1257 if (error)
1258 return error;
1259
1260 dev_info(dev,
1261 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1262 data->product_id,
1263 data->fw_version,
1264 data->sm_version,
1265 data->iap_version);
1266
1267 dev_dbg(dev,
1268 "Elan Touchpad Extra Information:\n"
1269 " Max ABS X,Y: %d,%d\n"
1270 " Width X,Y: %d,%d\n"
1271 " Resolution X,Y: %d,%d (dots/mm)\n"
1272 " ic type: 0x%x\n"
1273 " info pattern: 0x%x\n",
1274 data->max_x, data->max_y,
1275 data->width_x, data->width_y,
1276 data->x_res, data->y_res,
1277 data->ic_type, data->pattern);
1278
1279 /* Set up input device properties based on queried parameters. */
1280 error = elan_setup_input_device(data);
1281 if (error)
1282 return error;
1283
1284 if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1285 error = elan_setup_trackpoint_input_device(data);
1286 if (error)
1287 return error;
1288 }
1289
1290 /*
1291 * Platform code (ACPI, DTS) should normally set up interrupt
1292 * for us, but in case it did not let's fall back to using falling
1293 * edge to be compatible with older Chromebooks.
1294 */
1295 irqflags = irq_get_trigger_type(client->irq);
1296 if (!irqflags)
1297 irqflags = IRQF_TRIGGER_FALLING;
1298
1299 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1300 irqflags | IRQF_ONESHOT,
1301 client->name, data);
1302 if (error) {
1303 dev_err(dev, "cannot register irq=%d\n", client->irq);
1304 return error;
1305 }
1306
1307 error = input_register_device(data->input);
1308 if (error) {
1309 dev_err(dev, "failed to register input device: %d\n", error);
1310 return error;
1311 }
1312
1313 if (data->tp_input) {
1314 error = input_register_device(data->tp_input);
1315 if (error) {
1316 dev_err(&client->dev,
1317 "failed to register TrackPoint input device: %d\n",
1318 error);
1319 return error;
1320 }
1321 }
1322
1323 return 0;
1324 }
1325
elan_suspend(struct device * dev)1326 static int elan_suspend(struct device *dev)
1327 {
1328 struct i2c_client *client = to_i2c_client(dev);
1329 struct elan_tp_data *data = i2c_get_clientdata(client);
1330 int ret;
1331
1332 /*
1333 * We are taking the mutex to make sure sysfs operations are
1334 * complete before we attempt to bring the device into low[er]
1335 * power mode.
1336 */
1337 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1338 if (ret)
1339 return ret;
1340
1341 disable_irq(client->irq);
1342
1343 if (device_may_wakeup(dev)) {
1344 ret = elan_sleep(data);
1345 } else {
1346 ret = elan_set_power(data, false);
1347 if (ret)
1348 goto err;
1349
1350 ret = regulator_disable(data->vcc);
1351 if (ret) {
1352 dev_err(dev, "error %d disabling regulator\n", ret);
1353 /* Attempt to power the chip back up */
1354 elan_set_power(data, true);
1355 }
1356 }
1357
1358 err:
1359 mutex_unlock(&data->sysfs_mutex);
1360 return ret;
1361 }
1362
elan_resume(struct device * dev)1363 static int elan_resume(struct device *dev)
1364 {
1365 struct i2c_client *client = to_i2c_client(dev);
1366 struct elan_tp_data *data = i2c_get_clientdata(client);
1367 int error;
1368
1369 if (!device_may_wakeup(dev)) {
1370 error = regulator_enable(data->vcc);
1371 if (error) {
1372 dev_err(dev, "error %d enabling regulator\n", error);
1373 goto err;
1374 }
1375 }
1376
1377 error = elan_set_power(data, true);
1378 if (error) {
1379 dev_err(dev, "power up when resuming failed: %d\n", error);
1380 goto err;
1381 }
1382
1383 error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1384 if (error)
1385 dev_err(dev, "initialize when resuming failed: %d\n", error);
1386
1387 err:
1388 enable_irq(data->client->irq);
1389 return error;
1390 }
1391
1392 static DEFINE_SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1393
1394 static const struct i2c_device_id elan_id[] = {
1395 { DRIVER_NAME, 0 },
1396 { },
1397 };
1398 MODULE_DEVICE_TABLE(i2c, elan_id);
1399
1400 #ifdef CONFIG_ACPI
1401 #include <linux/input/elan-i2c-ids.h>
1402 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1403 #endif
1404
1405 #ifdef CONFIG_OF
1406 static const struct of_device_id elan_of_match[] = {
1407 { .compatible = "elan,ekth3000" },
1408 { /* sentinel */ }
1409 };
1410 MODULE_DEVICE_TABLE(of, elan_of_match);
1411 #endif
1412
1413 static struct i2c_driver elan_driver = {
1414 .driver = {
1415 .name = DRIVER_NAME,
1416 .pm = pm_sleep_ptr(&elan_pm_ops),
1417 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1418 .of_match_table = of_match_ptr(elan_of_match),
1419 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1420 .dev_groups = elan_sysfs_groups,
1421 },
1422 .probe = elan_probe,
1423 .id_table = elan_id,
1424 };
1425
1426 module_i2c_driver(elan_driver);
1427
1428 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1429 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1430 MODULE_LICENSE("GPL");
1431
