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 <linux/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 guard(disable_irq)(&client->irq);
545
546 data->in_fw_update = true;
547
548 retval = __elan_update_firmware(data, fw);
549 if (retval) {
550 dev_err(&client->dev, "firmware update failed: %d\n", retval);
551 data->ops->iap_reset(client);
552 } else {
553 /* Reinitialize TP after fw is updated */
554 elan_initialize(data, false);
555 elan_query_device_info(data);
556 }
557
558 data->in_fw_update = false;
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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 int error;
625 const u8 *fw_signature;
626 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
627
628 if (data->fw_validpage_count == 0)
629 return -EINVAL;
630
631 /* Look for a firmware with the product id appended. */
632 const char *fw_name __free(kfree) =
633 kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
634 if (!fw_name) {
635 dev_err(dev, "failed to allocate memory for firmware name\n");
636 return -ENOMEM;
637 }
638
639 dev_info(dev, "requesting fw '%s'\n", fw_name);
640 const struct firmware *fw __free(firmware) = NULL;
641 error = request_firmware(&fw, fw_name, dev);
642 if (error) {
643 dev_err(dev, "failed to request firmware: %d\n", error);
644 return error;
645 }
646
647 /* Firmware file must match signature data */
648 fw_signature = &fw->data[data->fw_signature_address];
649 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
650 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
651 (int)sizeof(signature), signature,
652 (int)sizeof(signature), fw_signature);
653 return -EBADF;
654 }
655
656 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
657 error = elan_update_firmware(data, fw);
658 if (error)
659 return error;
660 }
661
662 return count;
663 }
664
elan_calibrate(struct elan_tp_data * data)665 static int elan_calibrate(struct elan_tp_data *data)
666 {
667 struct i2c_client *client = data->client;
668 struct device *dev = &client->dev;
669 int tries = 20;
670 int retval;
671 int error;
672 u8 val[ETP_CALIBRATE_MAX_LEN];
673
674 guard(disable_irq)(&client->irq);
675
676 data->mode |= ETP_ENABLE_CALIBRATE;
677 retval = data->ops->set_mode(client, data->mode);
678 if (retval) {
679 data->mode &= ~ETP_ENABLE_CALIBRATE;
680 dev_err(dev, "failed to enable calibration mode: %d\n",
681 retval);
682 return retval;
683 }
684
685 retval = data->ops->calibrate(client);
686 if (retval) {
687 dev_err(dev, "failed to start calibration: %d\n",
688 retval);
689 goto out_disable_calibrate;
690 }
691
692 val[0] = 0xff;
693 do {
694 /* Wait 250ms before checking if calibration has completed. */
695 msleep(250);
696
697 retval = data->ops->calibrate_result(client, val);
698 if (retval)
699 dev_err(dev, "failed to check calibration result: %d\n",
700 retval);
701 else if (val[0] == 0)
702 break; /* calibration done */
703
704 } while (--tries);
705
706 if (tries == 0) {
707 dev_err(dev, "failed to calibrate. Timeout.\n");
708 retval = -ETIMEDOUT;
709 }
710
711 out_disable_calibrate:
712 data->mode &= ~ETP_ENABLE_CALIBRATE;
713 error = data->ops->set_mode(data->client, data->mode);
714 if (error) {
715 dev_err(dev, "failed to disable calibration mode: %d\n",
716 error);
717 if (!retval)
718 retval = error;
719 }
720 return retval;
721 }
722
calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)723 static ssize_t calibrate_store(struct device *dev,
724 struct device_attribute *attr,
725 const char *buf, size_t count)
726 {
727 struct i2c_client *client = to_i2c_client(dev);
728 struct elan_tp_data *data = i2c_get_clientdata(client);
729 int error;
730
731 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
732 error = elan_calibrate(data);
733 if (error)
734 return error;
735 }
736
737 return count;
738 }
739
elan_sysfs_read_mode(struct device * dev,struct device_attribute * attr,char * buf)740 static ssize_t elan_sysfs_read_mode(struct device *dev,
741 struct device_attribute *attr,
742 char *buf)
743 {
744 struct i2c_client *client = to_i2c_client(dev);
745 struct elan_tp_data *data = i2c_get_clientdata(client);
746 int error;
747 enum tp_mode mode;
748
749 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
750 error = data->ops->iap_get_mode(data->client, &mode);
751 if (error)
752 return error;
753 }
754
755 return sysfs_emit(buf, "%d\n", (int)mode);
756 }
757
758 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
759 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
760 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
761 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
762 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
763 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
764 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
765
766 static DEVICE_ATTR_WO(calibrate);
767
768 static struct attribute *elan_sysfs_entries[] = {
769 &dev_attr_product_id.attr,
770 &dev_attr_firmware_version.attr,
771 &dev_attr_sample_version.attr,
772 &dev_attr_iap_version.attr,
773 &dev_attr_fw_checksum.attr,
774 &dev_attr_calibrate.attr,
775 &dev_attr_mode.attr,
776 &dev_attr_update_fw.attr,
777 NULL,
778 };
779
780 static const struct attribute_group elan_sysfs_group = {
781 .attrs = elan_sysfs_entries,
782 };
783
elan_acquire_baseline(struct elan_tp_data * data)784 static int elan_acquire_baseline(struct elan_tp_data *data)
785 {
786 struct i2c_client *client = data->client;
787 struct device *dev = &client->dev;
788 int retval;
789 int error;
790
791 guard(disable_irq)(&client->irq);
792
793 data->baseline_ready = false;
794
795 data->mode |= ETP_ENABLE_CALIBRATE;
796 retval = data->ops->set_mode(client, data->mode);
797 if (retval) {
798 data->mode &= ~ETP_ENABLE_CALIBRATE;
799 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
800 retval);
801 return retval;
802 }
803
804 msleep(250);
805
806 retval = data->ops->get_baseline_data(client, true,
807 &data->max_baseline);
808 if (retval) {
809 dev_err(dev, "Failed to read max baseline from device: %d\n",
810 retval);
811 goto out_disable_calibrate;
812 }
813
814 retval = data->ops->get_baseline_data(client, false,
815 &data->min_baseline);
816 if (retval) {
817 dev_err(dev, "Failed to read min baseline from device: %d\n",
818 retval);
819 goto out_disable_calibrate;
820 }
821
822 data->baseline_ready = true;
823
824 out_disable_calibrate:
825 data->mode &= ~ETP_ENABLE_CALIBRATE;
826 error = data->ops->set_mode(client, data->mode);
827 if (error) {
828 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
829 error);
830 if (!retval)
831 retval = error;
832 }
833
834 return retval;
835 }
836
acquire_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)837 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
838 const char *buf, size_t count)
839 {
840 struct i2c_client *client = to_i2c_client(dev);
841 struct elan_tp_data *data = i2c_get_clientdata(client);
842 int error;
843
844 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
845 error = elan_acquire_baseline(data);
846 if (error)
847 return error;
848 }
849
850 return count;
851 }
852
min_show(struct device * dev,struct device_attribute * attr,char * buf)853 static ssize_t min_show(struct device *dev,
854 struct device_attribute *attr, char *buf)
855 {
856 struct i2c_client *client = to_i2c_client(dev);
857 struct elan_tp_data *data = i2c_get_clientdata(client);
858
859 scoped_guard(mutex_intr, &data->sysfs_mutex) {
860 if (!data->baseline_ready)
861 return -ENODATA;
862
863 return sysfs_emit(buf, "%d", data->min_baseline);
864 }
865
866 return -EINTR;
867 }
868
max_show(struct device * dev,struct device_attribute * attr,char * buf)869 static ssize_t max_show(struct device *dev,
870 struct device_attribute *attr, char *buf)
871 {
872 struct i2c_client *client = to_i2c_client(dev);
873 struct elan_tp_data *data = i2c_get_clientdata(client);
874
875 scoped_guard(mutex_intr, &data->sysfs_mutex) {
876 if (!data->baseline_ready)
877 return -ENODATA;
878
879 return sysfs_emit(buf, "%d", data->max_baseline);
880 }
881
882 return -EINTR;
883 }
884
885 static DEVICE_ATTR_WO(acquire);
886 static DEVICE_ATTR_RO(min);
887 static DEVICE_ATTR_RO(max);
888
889 static struct attribute *elan_baseline_sysfs_entries[] = {
890 &dev_attr_acquire.attr,
891 &dev_attr_min.attr,
892 &dev_attr_max.attr,
893 NULL,
894 };
895
896 static const struct attribute_group elan_baseline_sysfs_group = {
897 .name = "baseline",
898 .attrs = elan_baseline_sysfs_entries,
899 };
900
901 static const struct attribute_group *elan_sysfs_groups[] = {
902 &elan_sysfs_group,
903 &elan_baseline_sysfs_group,
904 NULL
905 };
906
907 /*
908 ******************************************************************
909 * Elan isr functions
910 ******************************************************************
911 */
elan_report_contact(struct elan_tp_data * data,int contact_num,bool contact_valid,bool high_precision,u8 * packet,u8 * finger_data)912 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
913 bool contact_valid, bool high_precision,
914 u8 *packet, u8 *finger_data)
915 {
916 struct input_dev *input = data->input;
917 unsigned int pos_x, pos_y;
918 unsigned int pressure, scaled_pressure;
919
920 if (contact_valid) {
921 if (high_precision) {
922 pos_x = get_unaligned_be16(&finger_data[0]);
923 pos_y = get_unaligned_be16(&finger_data[2]);
924 } else {
925 pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
926 pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
927 }
928
929 if (pos_x > data->max_x || pos_y > data->max_y) {
930 dev_dbg(input->dev.parent,
931 "[%d] x=%d y=%d over max (%d, %d)",
932 contact_num, pos_x, pos_y,
933 data->max_x, data->max_y);
934 return;
935 }
936
937 pressure = finger_data[4];
938 scaled_pressure = pressure + data->pressure_adjustment;
939 if (scaled_pressure > ETP_MAX_PRESSURE)
940 scaled_pressure = ETP_MAX_PRESSURE;
941
942 input_mt_slot(input, contact_num);
943 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
944 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
945 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
946 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
947
948 if (data->report_features & ETP_FEATURE_REPORT_MK) {
949 unsigned int mk_x, mk_y, area_x, area_y;
950 u8 mk_data = high_precision ?
951 packet[ETP_MK_DATA_OFFSET + contact_num] :
952 finger_data[3];
953
954 mk_x = mk_data & 0x0f;
955 mk_y = mk_data >> 4;
956
957 /*
958 * To avoid treating large finger as palm, let's reduce
959 * the width x and y per trace.
960 */
961 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
962 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
963
964 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
965 input_report_abs(input, ABS_MT_TOUCH_MAJOR,
966 max(area_x, area_y));
967 input_report_abs(input, ABS_MT_TOUCH_MINOR,
968 min(area_x, area_y));
969 }
970 } else {
971 input_mt_slot(input, contact_num);
972 input_mt_report_slot_inactive(input);
973 }
974 }
975
elan_report_absolute(struct elan_tp_data * data,u8 * packet,bool high_precision)976 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
977 bool high_precision)
978 {
979 struct input_dev *input = data->input;
980 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
981 int i;
982 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
983 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
984 bool contact_valid, hover_event;
985
986 pm_wakeup_event(&data->client->dev, 0);
987
988 hover_event = hover_info & BIT(6);
989
990 for (i = 0; i < ETP_MAX_FINGERS; i++) {
991 contact_valid = tp_info & BIT(3 + i);
992 elan_report_contact(data, i, contact_valid, high_precision,
993 packet, finger_data);
994 if (contact_valid)
995 finger_data += ETP_FINGER_DATA_LEN;
996 }
997
998 input_report_key(input, BTN_LEFT, tp_info & BIT(0));
999 input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1000 input_report_key(input, BTN_RIGHT, tp_info & BIT(1));
1001 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1002 input_mt_report_pointer_emulation(input, true);
1003 input_sync(input);
1004 }
1005
elan_report_trackpoint(struct elan_tp_data * data,u8 * report)1006 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1007 {
1008 struct input_dev *input = data->tp_input;
1009 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1010 int x, y;
1011
1012 pm_wakeup_event(&data->client->dev, 0);
1013
1014 if (!data->tp_input) {
1015 dev_warn_once(&data->client->dev,
1016 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1017 return;
1018 }
1019
1020 input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1021 input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1022 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1023
1024 if ((packet[3] & 0x0F) == 0x06) {
1025 x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1026 y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1027
1028 input_report_rel(input, REL_X, x);
1029 input_report_rel(input, REL_Y, y);
1030 }
1031
1032 input_sync(input);
1033 }
1034
elan_isr(int irq,void * dev_id)1035 static irqreturn_t elan_isr(int irq, void *dev_id)
1036 {
1037 struct elan_tp_data *data = dev_id;
1038 int error;
1039 u8 report[ETP_MAX_REPORT_LEN];
1040
1041 /*
1042 * When device is connected to i2c bus, when all IAP page writes
1043 * complete, the driver will receive interrupt and must read
1044 * 0000 to confirm that IAP is finished.
1045 */
1046 if (data->in_fw_update) {
1047 complete(&data->fw_completion);
1048 goto out;
1049 }
1050
1051 error = data->ops->get_report(data->client, report, data->report_len);
1052 if (error)
1053 goto out;
1054
1055 switch (report[ETP_REPORT_ID_OFFSET]) {
1056 case ETP_REPORT_ID:
1057 elan_report_absolute(data, report, false);
1058 break;
1059 case ETP_REPORT_ID2:
1060 elan_report_absolute(data, report, true);
1061 break;
1062 case ETP_TP_REPORT_ID:
1063 case ETP_TP_REPORT_ID2:
1064 elan_report_trackpoint(data, report);
1065 break;
1066 default:
1067 dev_err(&data->client->dev, "invalid report id data (%x)\n",
1068 report[ETP_REPORT_ID_OFFSET]);
1069 }
1070
1071 out:
1072 return IRQ_HANDLED;
1073 }
1074
1075 /*
1076 ******************************************************************
1077 * Elan initialization functions
1078 ******************************************************************
1079 */
1080
elan_setup_trackpoint_input_device(struct elan_tp_data * data)1081 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1082 {
1083 struct device *dev = &data->client->dev;
1084 struct input_dev *input;
1085
1086 input = devm_input_allocate_device(dev);
1087 if (!input)
1088 return -ENOMEM;
1089
1090 input->name = "Elan TrackPoint";
1091 input->id.bustype = BUS_I2C;
1092 input->id.vendor = ELAN_VENDOR_ID;
1093 input->id.product = data->product_id;
1094 input_set_drvdata(input, data);
1095
1096 input_set_capability(input, EV_REL, REL_X);
1097 input_set_capability(input, EV_REL, REL_Y);
1098 input_set_capability(input, EV_KEY, BTN_LEFT);
1099 input_set_capability(input, EV_KEY, BTN_RIGHT);
1100 input_set_capability(input, EV_KEY, BTN_MIDDLE);
1101
1102 __set_bit(INPUT_PROP_POINTER, input->propbit);
1103 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1104
1105 data->tp_input = input;
1106
1107 return 0;
1108 }
1109
elan_setup_input_device(struct elan_tp_data * data)1110 static int elan_setup_input_device(struct elan_tp_data *data)
1111 {
1112 struct device *dev = &data->client->dev;
1113 struct input_dev *input;
1114 unsigned int max_width = max(data->width_x, data->width_y);
1115 unsigned int min_width = min(data->width_x, data->width_y);
1116 int error;
1117
1118 input = devm_input_allocate_device(dev);
1119 if (!input)
1120 return -ENOMEM;
1121
1122 input->name = "Elan Touchpad";
1123 input->id.bustype = BUS_I2C;
1124 input->id.vendor = ELAN_VENDOR_ID;
1125 input->id.product = data->product_id;
1126 input_set_drvdata(input, data);
1127
1128 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1129 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1130 if (error) {
1131 dev_err(dev, "failed to initialize MT slots: %d\n", error);
1132 return error;
1133 }
1134
1135 __set_bit(EV_ABS, input->evbit);
1136 __set_bit(INPUT_PROP_POINTER, input->propbit);
1137 if (data->clickpad) {
1138 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1139 } else {
1140 __set_bit(BTN_RIGHT, input->keybit);
1141 if (data->middle_button)
1142 __set_bit(BTN_MIDDLE, input->keybit);
1143 }
1144 __set_bit(BTN_LEFT, input->keybit);
1145
1146 /* Set up ST parameters */
1147 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1148 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1149 input_abs_set_res(input, ABS_X, data->x_res);
1150 input_abs_set_res(input, ABS_Y, data->y_res);
1151 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1152 if (data->report_features & ETP_FEATURE_REPORT_MK)
1153 input_set_abs_params(input, ABS_TOOL_WIDTH,
1154 0, ETP_FINGER_WIDTH, 0, 0);
1155 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1156
1157 /* And MT parameters */
1158 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1159 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1160 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1161 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1162 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1163 ETP_MAX_PRESSURE, 0, 0);
1164 if (data->report_features & ETP_FEATURE_REPORT_MK) {
1165 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1166 0, ETP_FINGER_WIDTH * max_width, 0, 0);
1167 input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1168 0, ETP_FINGER_WIDTH * min_width, 0, 0);
1169 }
1170
1171 data->input = input;
1172
1173 return 0;
1174 }
1175
elan_disable_regulator(void * _data)1176 static void elan_disable_regulator(void *_data)
1177 {
1178 struct elan_tp_data *data = _data;
1179
1180 regulator_disable(data->vcc);
1181 }
1182
elan_probe(struct i2c_client * client)1183 static int elan_probe(struct i2c_client *client)
1184 {
1185 const struct elan_transport_ops *transport_ops;
1186 struct device *dev = &client->dev;
1187 struct elan_tp_data *data;
1188 unsigned long irqflags;
1189 int error;
1190
1191 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1192 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1193 transport_ops = &elan_i2c_ops;
1194 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1195 i2c_check_functionality(client->adapter,
1196 I2C_FUNC_SMBUS_BYTE_DATA |
1197 I2C_FUNC_SMBUS_BLOCK_DATA |
1198 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1199 transport_ops = &elan_smbus_ops;
1200 } else {
1201 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1202 return -EIO;
1203 }
1204
1205 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1206 if (!data)
1207 return -ENOMEM;
1208
1209 i2c_set_clientdata(client, data);
1210
1211 data->ops = transport_ops;
1212 data->client = client;
1213 init_completion(&data->fw_completion);
1214 mutex_init(&data->sysfs_mutex);
1215
1216 data->vcc = devm_regulator_get(dev, "vcc");
1217 if (IS_ERR(data->vcc))
1218 return dev_err_probe(dev, PTR_ERR(data->vcc), "Failed to get 'vcc' regulator\n");
1219
1220 error = regulator_enable(data->vcc);
1221 if (error) {
1222 dev_err(dev, "Failed to enable regulator: %d\n", error);
1223 return error;
1224 }
1225
1226 error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1227 if (error) {
1228 dev_err(dev, "Failed to add disable regulator action: %d\n",
1229 error);
1230 return error;
1231 }
1232
1233 /* Make sure there is something at this address */
1234 error = i2c_smbus_read_byte(client);
1235 if (error < 0) {
1236 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1237 return -ENXIO;
1238 }
1239
1240 /* Initialize the touchpad. */
1241 error = elan_initialize(data, false);
1242 if (error)
1243 return error;
1244
1245 error = elan_query_device_info(data);
1246 if (error)
1247 return error;
1248
1249 error = elan_query_device_parameters(data);
1250 if (error)
1251 return error;
1252
1253 dev_info(dev,
1254 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1255 data->product_id,
1256 data->fw_version,
1257 data->sm_version,
1258 data->iap_version);
1259
1260 dev_dbg(dev,
1261 "Elan Touchpad Extra Information:\n"
1262 " Max ABS X,Y: %d,%d\n"
1263 " Width X,Y: %d,%d\n"
1264 " Resolution X,Y: %d,%d (dots/mm)\n"
1265 " ic type: 0x%x\n"
1266 " info pattern: 0x%x\n",
1267 data->max_x, data->max_y,
1268 data->width_x, data->width_y,
1269 data->x_res, data->y_res,
1270 data->ic_type, data->pattern);
1271
1272 /* Set up input device properties based on queried parameters. */
1273 error = elan_setup_input_device(data);
1274 if (error)
1275 return error;
1276
1277 if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1278 error = elan_setup_trackpoint_input_device(data);
1279 if (error)
1280 return error;
1281 }
1282
1283 /*
1284 * Platform code (ACPI, DTS) should normally set up interrupt
1285 * for us, but in case it did not let's fall back to using falling
1286 * edge to be compatible with older Chromebooks.
1287 */
1288 irqflags = irq_get_trigger_type(client->irq);
1289 if (!irqflags)
1290 irqflags = IRQF_TRIGGER_FALLING;
1291
1292 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1293 irqflags | IRQF_ONESHOT,
1294 client->name, data);
1295 if (error) {
1296 dev_err(dev, "cannot register irq=%d\n", client->irq);
1297 return error;
1298 }
1299
1300 error = input_register_device(data->input);
1301 if (error) {
1302 dev_err(dev, "failed to register input device: %d\n", error);
1303 return error;
1304 }
1305
1306 if (data->tp_input) {
1307 error = input_register_device(data->tp_input);
1308 if (error) {
1309 dev_err(&client->dev,
1310 "failed to register TrackPoint input device: %d\n",
1311 error);
1312 return error;
1313 }
1314 }
1315
1316 return 0;
1317 }
1318
__elan_suspend(struct elan_tp_data * data)1319 static int __elan_suspend(struct elan_tp_data *data)
1320 {
1321 struct i2c_client *client = data->client;
1322 int error;
1323
1324 if (device_may_wakeup(&client->dev))
1325 return elan_sleep(data);
1326
1327 /* Touchpad is not a wakeup source */
1328 error = elan_set_power(data, false);
1329 if (error)
1330 return error;
1331
1332 error = regulator_disable(data->vcc);
1333 if (error) {
1334 dev_err(&client->dev,
1335 "failed to disable regulator when suspending: %d\n",
1336 error);
1337 /* Attempt to power the chip back up */
1338 elan_set_power(data, true);
1339 return error;
1340 }
1341
1342 return 0;
1343 }
1344
elan_suspend(struct device * dev)1345 static int elan_suspend(struct device *dev)
1346 {
1347 struct i2c_client *client = to_i2c_client(dev);
1348 struct elan_tp_data *data = i2c_get_clientdata(client);
1349 int error;
1350
1351 /*
1352 * We are taking the mutex to make sure sysfs operations are
1353 * complete before we attempt to bring the device into low[er]
1354 * power mode.
1355 */
1356 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
1357 disable_irq(client->irq);
1358
1359 error = __elan_suspend(data);
1360 if (error) {
1361 enable_irq(client->irq);
1362 return error;
1363 }
1364 }
1365
1366 return 0;
1367 }
1368
elan_resume(struct device * dev)1369 static int elan_resume(struct device *dev)
1370 {
1371 struct i2c_client *client = to_i2c_client(dev);
1372 struct elan_tp_data *data = i2c_get_clientdata(client);
1373 int error;
1374
1375 if (!device_may_wakeup(dev)) {
1376 error = regulator_enable(data->vcc);
1377 if (error) {
1378 dev_err(dev, "error %d enabling regulator\n", error);
1379 goto err;
1380 }
1381 }
1382
1383 error = elan_set_power(data, true);
1384 if (error) {
1385 dev_err(dev, "power up when resuming failed: %d\n", error);
1386 goto err;
1387 }
1388
1389 error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1390 if (error)
1391 dev_err(dev, "initialize when resuming failed: %d\n", error);
1392
1393 err:
1394 enable_irq(data->client->irq);
1395 return error;
1396 }
1397
1398 static DEFINE_SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1399
1400 static const struct i2c_device_id elan_id[] = {
1401 { DRIVER_NAME },
1402 { }
1403 };
1404 MODULE_DEVICE_TABLE(i2c, elan_id);
1405
1406 #ifdef CONFIG_ACPI
1407 #include <linux/input/elan-i2c-ids.h>
1408 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1409 #endif
1410
1411 #ifdef CONFIG_OF
1412 static const struct of_device_id elan_of_match[] = {
1413 { .compatible = "elan,ekth3000" },
1414 { /* sentinel */ }
1415 };
1416 MODULE_DEVICE_TABLE(of, elan_of_match);
1417 #endif
1418
1419 static struct i2c_driver elan_driver = {
1420 .driver = {
1421 .name = DRIVER_NAME,
1422 .pm = pm_sleep_ptr(&elan_pm_ops),
1423 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1424 .of_match_table = of_match_ptr(elan_of_match),
1425 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1426 .dev_groups = elan_sysfs_groups,
1427 },
1428 .probe = elan_probe,
1429 .id_table = elan_id,
1430 };
1431
1432 module_i2c_driver(elan_driver);
1433
1434 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1435 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1436 MODULE_LICENSE("GPL");
1437