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/string_choices.h>
32 #include <linux/input.h>
33 #include <linux/uaccess.h>
34 #include <linux/jiffies.h>
35 #include <linux/completion.h>
36 #include <linux/of.h>
37 #include <linux/pm_wakeirq.h>
38 #include <linux/property.h>
39 #include <linux/regulator/consumer.h>
40 #include <linux/unaligned.h>
41
42 #include "elan_i2c.h"
43
44 #define DRIVER_NAME "elan_i2c"
45 #define ELAN_VENDOR_ID 0x04f3
46 #define ETP_MAX_PRESSURE 255
47 #define ETP_FWIDTH_REDUCE 90
48 #define ETP_FINGER_WIDTH 15
49 #define ETP_RETRY_COUNT 3
50
51 /* quirks to control the device */
52 #define ETP_QUIRK_QUICK_WAKEUP BIT(0)
53
54 /* The main device structure */
55 struct elan_tp_data {
56 struct i2c_client *client;
57 struct input_dev *input;
58 struct input_dev *tp_input; /* trackpoint input node */
59 struct regulator *vcc;
60
61 const struct elan_transport_ops *ops;
62
63 /* for fw update */
64 struct completion fw_completion;
65 bool in_fw_update;
66
67 struct mutex sysfs_mutex;
68
69 unsigned int max_x;
70 unsigned int max_y;
71 unsigned int width_x;
72 unsigned int width_y;
73 unsigned int x_res;
74 unsigned int y_res;
75
76 u8 pattern;
77 u16 product_id;
78 u8 fw_version;
79 u8 sm_version;
80 u8 iap_version;
81 u16 fw_checksum;
82 unsigned int report_features;
83 unsigned int report_len;
84 int pressure_adjustment;
85 u8 mode;
86 u16 ic_type;
87 u16 fw_validpage_count;
88 u16 fw_page_size;
89 u32 fw_signature_address;
90
91 u8 min_baseline;
92 u8 max_baseline;
93 bool baseline_ready;
94 u8 clickpad;
95 bool middle_button;
96
97 u32 quirks; /* Various quirks */
98 };
99
elan_i2c_lookup_quirks(u16 ic_type,u16 product_id)100 static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
101 {
102 static const struct {
103 u16 ic_type;
104 u16 product_id;
105 u32 quirks;
106 } elan_i2c_quirks[] = {
107 { 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
108 { 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
109 { 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
110 { 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
111 { 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
112 };
113 u32 quirks = 0;
114 int i;
115
116 for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
117 if (elan_i2c_quirks[i].ic_type == ic_type &&
118 elan_i2c_quirks[i].product_id == product_id) {
119 quirks = elan_i2c_quirks[i].quirks;
120 }
121 }
122
123 if (ic_type >= 0x0D && product_id >= 0x123)
124 quirks |= ETP_QUIRK_QUICK_WAKEUP;
125
126 return quirks;
127 }
128
elan_get_fwinfo(u16 ic_type,u8 iap_version,u16 * validpage_count,u32 * signature_address,u16 * page_size)129 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
130 u32 *signature_address, u16 *page_size)
131 {
132 switch (ic_type) {
133 case 0x00:
134 case 0x06:
135 case 0x08:
136 *validpage_count = 512;
137 break;
138 case 0x03:
139 case 0x07:
140 case 0x09:
141 case 0x0A:
142 case 0x0B:
143 case 0x0C:
144 *validpage_count = 768;
145 break;
146 case 0x0D:
147 *validpage_count = 896;
148 break;
149 case 0x0E:
150 *validpage_count = 640;
151 break;
152 case 0x10:
153 *validpage_count = 1024;
154 break;
155 case 0x11:
156 *validpage_count = 1280;
157 break;
158 case 0x13:
159 *validpage_count = 2048;
160 break;
161 case 0x14:
162 case 0x15:
163 *validpage_count = 1024;
164 break;
165 case 0x19:
166 *validpage_count = 2032;
167 break;
168 default:
169 /* unknown ic type clear value */
170 *validpage_count = 0;
171 *signature_address = 0;
172 *page_size = 0;
173 return -ENXIO;
174 }
175
176 *signature_address =
177 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
178
179 if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
180 *validpage_count /= 8;
181 *page_size = ETP_FW_PAGE_SIZE_512;
182 } else if (ic_type >= 0x0D && iap_version >= 1) {
183 *validpage_count /= 2;
184 *page_size = ETP_FW_PAGE_SIZE_128;
185 } else {
186 *page_size = ETP_FW_PAGE_SIZE;
187 }
188
189 return 0;
190 }
191
elan_set_power(struct elan_tp_data * data,bool on)192 static int elan_set_power(struct elan_tp_data *data, bool on)
193 {
194 int repeat = ETP_RETRY_COUNT;
195 int error;
196
197 do {
198 error = data->ops->power_control(data->client, on);
199 if (error >= 0)
200 return 0;
201
202 msleep(30);
203 } while (--repeat > 0);
204
205 dev_err(&data->client->dev, "failed to set power %s: %d\n",
206 str_on_off(on), error);
207 return error;
208 }
209
elan_sleep(struct elan_tp_data * data)210 static int elan_sleep(struct elan_tp_data *data)
211 {
212 int repeat = ETP_RETRY_COUNT;
213 int error;
214
215 do {
216 error = data->ops->sleep_control(data->client, true);
217 if (!error)
218 return 0;
219
220 msleep(30);
221 } while (--repeat > 0);
222
223 return error;
224 }
225
elan_query_product(struct elan_tp_data * data)226 static int elan_query_product(struct elan_tp_data *data)
227 {
228 int error;
229
230 error = data->ops->get_product_id(data->client, &data->product_id);
231 if (error)
232 return error;
233
234 error = data->ops->get_pattern(data->client, &data->pattern);
235 if (error)
236 return error;
237
238 error = data->ops->get_sm_version(data->client, data->pattern,
239 &data->ic_type, &data->sm_version,
240 &data->clickpad);
241 if (error)
242 return error;
243
244 return 0;
245 }
246
elan_check_ASUS_special_fw(struct elan_tp_data * data)247 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
248 {
249 if (data->ic_type == 0x0E) {
250 switch (data->product_id) {
251 case 0x05 ... 0x07:
252 case 0x09:
253 case 0x13:
254 return true;
255 }
256 } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
257 /* ASUS EeeBook X205TA */
258 return true;
259 }
260
261 return false;
262 }
263
__elan_initialize(struct elan_tp_data * data,bool skip_reset)264 static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
265 {
266 struct i2c_client *client = data->client;
267 bool woken_up = false;
268 int error;
269
270 if (!skip_reset) {
271 error = data->ops->initialize(client);
272 if (error) {
273 dev_err(&client->dev, "device initialize failed: %d\n", error);
274 return error;
275 }
276 }
277
278 error = elan_query_product(data);
279 if (error)
280 return error;
281
282 /*
283 * Some ASUS devices were shipped with firmware that requires
284 * touchpads to be woken up first, before attempting to switch
285 * them into absolute reporting mode.
286 */
287 if (elan_check_ASUS_special_fw(data)) {
288 error = data->ops->sleep_control(client, false);
289 if (error) {
290 dev_err(&client->dev,
291 "failed to wake device up: %d\n", error);
292 return error;
293 }
294
295 msleep(200);
296 woken_up = true;
297 }
298
299 data->mode |= ETP_ENABLE_ABS;
300 error = data->ops->set_mode(client, data->mode);
301 if (error) {
302 dev_err(&client->dev,
303 "failed to switch to absolute mode: %d\n", error);
304 return error;
305 }
306
307 if (!woken_up) {
308 error = data->ops->sleep_control(client, false);
309 if (error) {
310 dev_err(&client->dev,
311 "failed to wake device up: %d\n", error);
312 return error;
313 }
314 }
315
316 return 0;
317 }
318
elan_initialize(struct elan_tp_data * data,bool skip_reset)319 static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
320 {
321 int repeat = ETP_RETRY_COUNT;
322 int error;
323
324 do {
325 error = __elan_initialize(data, skip_reset);
326 if (!error)
327 return 0;
328
329 skip_reset = false;
330 msleep(30);
331 } while (--repeat > 0);
332
333 return error;
334 }
335
elan_query_device_info(struct elan_tp_data * data)336 static int elan_query_device_info(struct elan_tp_data *data)
337 {
338 int error;
339
340 error = data->ops->get_version(data->client, data->pattern, false,
341 &data->fw_version);
342 if (error)
343 return error;
344
345 error = data->ops->get_checksum(data->client, false,
346 &data->fw_checksum);
347 if (error)
348 return error;
349
350 error = data->ops->get_version(data->client, data->pattern,
351 true, &data->iap_version);
352 if (error)
353 return error;
354
355 error = data->ops->get_pressure_adjustment(data->client,
356 &data->pressure_adjustment);
357 if (error)
358 return error;
359
360 error = data->ops->get_report_features(data->client, data->pattern,
361 &data->report_features,
362 &data->report_len);
363 if (error)
364 return error;
365
366 data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
367
368 error = elan_get_fwinfo(data->ic_type, data->iap_version,
369 &data->fw_validpage_count,
370 &data->fw_signature_address,
371 &data->fw_page_size);
372 if (error)
373 dev_warn(&data->client->dev,
374 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
375 data->iap_version, data->ic_type);
376
377 return 0;
378 }
379
elan_convert_resolution(u8 val,u8 pattern)380 static unsigned int elan_convert_resolution(u8 val, u8 pattern)
381 {
382 /*
383 * pattern <= 0x01:
384 * (value from firmware) * 10 + 790 = dpi
385 * else
386 * ((value from firmware) + 3) * 100 = dpi
387 */
388 int res = pattern <= 0x01 ?
389 (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
390 /*
391 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
392 * point).
393 */
394 return res * 10 / 254;
395 }
396
elan_query_device_parameters(struct elan_tp_data * data)397 static int elan_query_device_parameters(struct elan_tp_data *data)
398 {
399 struct i2c_client *client = data->client;
400 unsigned int x_traces, y_traces;
401 u32 x_mm, y_mm;
402 u8 hw_x_res, hw_y_res;
403 int error;
404
405 if (device_property_read_u32(&client->dev,
406 "touchscreen-size-x", &data->max_x) ||
407 device_property_read_u32(&client->dev,
408 "touchscreen-size-y", &data->max_y)) {
409 error = data->ops->get_max(data->client,
410 &data->max_x,
411 &data->max_y);
412 if (error)
413 return error;
414 } else {
415 /* size is the maximum + 1 */
416 --data->max_x;
417 --data->max_y;
418 }
419
420 if (device_property_read_u32(&client->dev,
421 "elan,x_traces",
422 &x_traces) ||
423 device_property_read_u32(&client->dev,
424 "elan,y_traces",
425 &y_traces)) {
426 error = data->ops->get_num_traces(data->client,
427 &x_traces, &y_traces);
428 if (error)
429 return error;
430 }
431 data->width_x = data->max_x / x_traces;
432 data->width_y = data->max_y / y_traces;
433
434 if (device_property_read_u32(&client->dev,
435 "touchscreen-x-mm", &x_mm) ||
436 device_property_read_u32(&client->dev,
437 "touchscreen-y-mm", &y_mm)) {
438 error = data->ops->get_resolution(data->client,
439 &hw_x_res, &hw_y_res);
440 if (error)
441 return error;
442
443 data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
444 data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
445 } else {
446 data->x_res = (data->max_x + 1) / x_mm;
447 data->y_res = (data->max_y + 1) / y_mm;
448 }
449
450 if (device_property_read_bool(&client->dev, "elan,clickpad"))
451 data->clickpad = 1;
452
453 if (device_property_read_bool(&client->dev, "elan,middle-button"))
454 data->middle_button = true;
455
456 return 0;
457 }
458
459 /*
460 **********************************************************
461 * IAP firmware updater related routines
462 **********************************************************
463 */
elan_write_fw_block(struct elan_tp_data * data,u16 page_size,const u8 * page,u16 checksum,int idx)464 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
465 const u8 *page, u16 checksum, int idx)
466 {
467 int retry = ETP_RETRY_COUNT;
468 int error;
469
470 do {
471 error = data->ops->write_fw_block(data->client, page_size,
472 page, checksum, idx);
473 if (!error)
474 return 0;
475
476 dev_dbg(&data->client->dev,
477 "IAP retrying page %d (error: %d)\n", idx, error);
478 } while (--retry > 0);
479
480 return error;
481 }
482
__elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)483 static int __elan_update_firmware(struct elan_tp_data *data,
484 const struct firmware *fw)
485 {
486 struct i2c_client *client = data->client;
487 struct device *dev = &client->dev;
488 int i, j;
489 int error;
490 u16 iap_start_addr;
491 u16 boot_page_count;
492 u16 sw_checksum = 0, fw_checksum = 0;
493
494 error = data->ops->prepare_fw_update(client, data->ic_type,
495 data->iap_version,
496 data->fw_page_size);
497 if (error)
498 return error;
499
500 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
501
502 boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
503 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
504 u16 checksum = 0;
505 const u8 *page = &fw->data[i * data->fw_page_size];
506
507 for (j = 0; j < data->fw_page_size; j += 2)
508 checksum += ((page[j + 1] << 8) | page[j]);
509
510 error = elan_write_fw_block(data, data->fw_page_size,
511 page, checksum, i);
512 if (error) {
513 dev_err(dev, "write page %d fail: %d\n", i, error);
514 return error;
515 }
516
517 sw_checksum += checksum;
518 }
519
520 /* Wait WDT reset and power on reset */
521 msleep(600);
522
523 error = data->ops->finish_fw_update(client, &data->fw_completion);
524 if (error)
525 return error;
526
527 error = data->ops->get_checksum(client, true, &fw_checksum);
528 if (error)
529 return error;
530
531 if (sw_checksum != fw_checksum) {
532 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
533 sw_checksum, fw_checksum);
534 return -EIO;
535 }
536
537 return 0;
538 }
539
elan_update_firmware(struct elan_tp_data * data,const struct firmware * fw)540 static int elan_update_firmware(struct elan_tp_data *data,
541 const struct firmware *fw)
542 {
543 struct i2c_client *client = data->client;
544 int retval;
545
546 dev_dbg(&client->dev, "Starting firmware update....\n");
547
548 guard(disable_irq)(&client->irq);
549
550 data->in_fw_update = true;
551
552 retval = __elan_update_firmware(data, fw);
553 if (retval) {
554 dev_err(&client->dev, "firmware update failed: %d\n", retval);
555 data->ops->iap_reset(client);
556 } else {
557 /* Reinitialize TP after fw is updated */
558 elan_initialize(data, false);
559 elan_query_device_info(data);
560 }
561
562 data->in_fw_update = false;
563
564 return retval;
565 }
566
567 /*
568 *******************************************************************
569 * SYSFS attributes
570 *******************************************************************
571 */
elan_sysfs_read_fw_checksum(struct device * dev,struct device_attribute * attr,char * buf)572 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
573 struct device_attribute *attr,
574 char *buf)
575 {
576 struct i2c_client *client = to_i2c_client(dev);
577 struct elan_tp_data *data = i2c_get_clientdata(client);
578
579 return sysfs_emit(buf, "0x%04x\n", data->fw_checksum);
580 }
581
elan_sysfs_read_product_id(struct device * dev,struct device_attribute * attr,char * buf)582 static ssize_t elan_sysfs_read_product_id(struct device *dev,
583 struct device_attribute *attr,
584 char *buf)
585 {
586 struct i2c_client *client = to_i2c_client(dev);
587 struct elan_tp_data *data = i2c_get_clientdata(client);
588
589 return sysfs_emit(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
590 data->product_id);
591 }
592
elan_sysfs_read_fw_ver(struct device * dev,struct device_attribute * attr,char * buf)593 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
594 struct device_attribute *attr,
595 char *buf)
596 {
597 struct i2c_client *client = to_i2c_client(dev);
598 struct elan_tp_data *data = i2c_get_clientdata(client);
599
600 return sysfs_emit(buf, "%d.0\n", data->fw_version);
601 }
602
elan_sysfs_read_sm_ver(struct device * dev,struct device_attribute * attr,char * buf)603 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
604 struct device_attribute *attr,
605 char *buf)
606 {
607 struct i2c_client *client = to_i2c_client(dev);
608 struct elan_tp_data *data = i2c_get_clientdata(client);
609
610 return sysfs_emit(buf, "%d.0\n", data->sm_version);
611 }
612
elan_sysfs_read_iap_ver(struct device * dev,struct device_attribute * attr,char * buf)613 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
614 struct device_attribute *attr,
615 char *buf)
616 {
617 struct i2c_client *client = to_i2c_client(dev);
618 struct elan_tp_data *data = i2c_get_clientdata(client);
619
620 return sysfs_emit(buf, "%d.0\n", data->iap_version);
621 }
622
elan_sysfs_update_fw(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)623 static ssize_t elan_sysfs_update_fw(struct device *dev,
624 struct device_attribute *attr,
625 const char *buf, size_t count)
626 {
627 struct elan_tp_data *data = dev_get_drvdata(dev);
628 int error;
629 const u8 *fw_signature;
630 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
631
632 if (data->fw_validpage_count == 0)
633 return -EINVAL;
634
635 /* Look for a firmware with the product id appended. */
636 const char *fw_name __free(kfree) =
637 kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
638 if (!fw_name) {
639 dev_err(dev, "failed to allocate memory for firmware name\n");
640 return -ENOMEM;
641 }
642
643 dev_info(dev, "requesting fw '%s'\n", fw_name);
644 const struct firmware *fw __free(firmware) = NULL;
645 error = request_firmware(&fw, fw_name, dev);
646 if (error) {
647 dev_err(dev, "failed to request firmware: %d\n", error);
648 return error;
649 }
650
651 if (fw->size < data->fw_signature_address + sizeof(signature)) {
652 dev_err(dev, "firmware file too small\n");
653 return -EBADF;
654 }
655
656 /* Firmware file must match signature data */
657 fw_signature = &fw->data[data->fw_signature_address];
658 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
659 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
660 (int)sizeof(signature), signature,
661 (int)sizeof(signature), fw_signature);
662 return -EBADF;
663 }
664
665 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
666 error = elan_update_firmware(data, fw);
667 if (error)
668 return error;
669 }
670
671 return count;
672 }
673
elan_calibrate(struct elan_tp_data * data)674 static int elan_calibrate(struct elan_tp_data *data)
675 {
676 struct i2c_client *client = data->client;
677 struct device *dev = &client->dev;
678 int tries = 20;
679 int retval;
680 int error;
681 u8 val[ETP_CALIBRATE_MAX_LEN];
682
683 guard(disable_irq)(&client->irq);
684
685 data->mode |= ETP_ENABLE_CALIBRATE;
686 retval = data->ops->set_mode(client, data->mode);
687 if (retval) {
688 data->mode &= ~ETP_ENABLE_CALIBRATE;
689 dev_err(dev, "failed to enable calibration mode: %d\n",
690 retval);
691 return retval;
692 }
693
694 retval = data->ops->calibrate(client);
695 if (retval) {
696 dev_err(dev, "failed to start calibration: %d\n",
697 retval);
698 goto out_disable_calibrate;
699 }
700
701 val[0] = 0xff;
702 do {
703 /* Wait 250ms before checking if calibration has completed. */
704 msleep(250);
705
706 retval = data->ops->calibrate_result(client, val);
707 if (retval)
708 dev_err(dev, "failed to check calibration result: %d\n",
709 retval);
710 else if (val[0] == 0)
711 break; /* calibration done */
712
713 } while (--tries);
714
715 if (tries == 0) {
716 dev_err(dev, "failed to calibrate. Timeout.\n");
717 retval = -ETIMEDOUT;
718 }
719
720 out_disable_calibrate:
721 data->mode &= ~ETP_ENABLE_CALIBRATE;
722 error = data->ops->set_mode(data->client, data->mode);
723 if (error) {
724 dev_err(dev, "failed to disable calibration mode: %d\n",
725 error);
726 if (!retval)
727 retval = error;
728 }
729 return retval;
730 }
731
calibrate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)732 static ssize_t calibrate_store(struct device *dev,
733 struct device_attribute *attr,
734 const char *buf, size_t count)
735 {
736 struct i2c_client *client = to_i2c_client(dev);
737 struct elan_tp_data *data = i2c_get_clientdata(client);
738 int error;
739
740 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
741 error = elan_calibrate(data);
742 if (error)
743 return error;
744 }
745
746 return count;
747 }
748
elan_sysfs_read_mode(struct device * dev,struct device_attribute * attr,char * buf)749 static ssize_t elan_sysfs_read_mode(struct device *dev,
750 struct device_attribute *attr,
751 char *buf)
752 {
753 struct i2c_client *client = to_i2c_client(dev);
754 struct elan_tp_data *data = i2c_get_clientdata(client);
755 int error;
756 enum tp_mode mode;
757
758 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
759 error = data->ops->iap_get_mode(data->client, &mode);
760 if (error)
761 return error;
762 }
763
764 return sysfs_emit(buf, "%d\n", (int)mode);
765 }
766
767 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
768 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
769 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
770 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
771 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
772 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
773 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
774
775 static DEVICE_ATTR_WO(calibrate);
776
777 static struct attribute *elan_sysfs_entries[] = {
778 &dev_attr_product_id.attr,
779 &dev_attr_firmware_version.attr,
780 &dev_attr_sample_version.attr,
781 &dev_attr_iap_version.attr,
782 &dev_attr_fw_checksum.attr,
783 &dev_attr_calibrate.attr,
784 &dev_attr_mode.attr,
785 &dev_attr_update_fw.attr,
786 NULL,
787 };
788
789 static const struct attribute_group elan_sysfs_group = {
790 .attrs = elan_sysfs_entries,
791 };
792
elan_acquire_baseline(struct elan_tp_data * data)793 static int elan_acquire_baseline(struct elan_tp_data *data)
794 {
795 struct i2c_client *client = data->client;
796 struct device *dev = &client->dev;
797 int retval;
798 int error;
799
800 guard(disable_irq)(&client->irq);
801
802 data->baseline_ready = false;
803
804 data->mode |= ETP_ENABLE_CALIBRATE;
805 retval = data->ops->set_mode(client, data->mode);
806 if (retval) {
807 data->mode &= ~ETP_ENABLE_CALIBRATE;
808 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
809 retval);
810 return retval;
811 }
812
813 msleep(250);
814
815 retval = data->ops->get_baseline_data(client, true,
816 &data->max_baseline);
817 if (retval) {
818 dev_err(dev, "Failed to read max baseline from device: %d\n",
819 retval);
820 goto out_disable_calibrate;
821 }
822
823 retval = data->ops->get_baseline_data(client, false,
824 &data->min_baseline);
825 if (retval) {
826 dev_err(dev, "Failed to read min baseline from device: %d\n",
827 retval);
828 goto out_disable_calibrate;
829 }
830
831 data->baseline_ready = true;
832
833 out_disable_calibrate:
834 data->mode &= ~ETP_ENABLE_CALIBRATE;
835 error = data->ops->set_mode(client, data->mode);
836 if (error) {
837 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
838 error);
839 if (!retval)
840 retval = error;
841 }
842
843 return retval;
844 }
845
acquire_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)846 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
847 const char *buf, size_t count)
848 {
849 struct i2c_client *client = to_i2c_client(dev);
850 struct elan_tp_data *data = i2c_get_clientdata(client);
851 int error;
852
853 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
854 error = elan_acquire_baseline(data);
855 if (error)
856 return error;
857 }
858
859 return count;
860 }
861
min_show(struct device * dev,struct device_attribute * attr,char * buf)862 static ssize_t min_show(struct device *dev,
863 struct device_attribute *attr, char *buf)
864 {
865 struct i2c_client *client = to_i2c_client(dev);
866 struct elan_tp_data *data = i2c_get_clientdata(client);
867
868 scoped_guard(mutex_intr, &data->sysfs_mutex) {
869 if (!data->baseline_ready)
870 return -ENODATA;
871
872 return sysfs_emit(buf, "%d", data->min_baseline);
873 }
874
875 return -EINTR;
876 }
877
max_show(struct device * dev,struct device_attribute * attr,char * buf)878 static ssize_t max_show(struct device *dev,
879 struct device_attribute *attr, char *buf)
880 {
881 struct i2c_client *client = to_i2c_client(dev);
882 struct elan_tp_data *data = i2c_get_clientdata(client);
883
884 scoped_guard(mutex_intr, &data->sysfs_mutex) {
885 if (!data->baseline_ready)
886 return -ENODATA;
887
888 return sysfs_emit(buf, "%d", data->max_baseline);
889 }
890
891 return -EINTR;
892 }
893
894 static DEVICE_ATTR_WO(acquire);
895 static DEVICE_ATTR_RO(min);
896 static DEVICE_ATTR_RO(max);
897
898 static struct attribute *elan_baseline_sysfs_entries[] = {
899 &dev_attr_acquire.attr,
900 &dev_attr_min.attr,
901 &dev_attr_max.attr,
902 NULL,
903 };
904
905 static const struct attribute_group elan_baseline_sysfs_group = {
906 .name = "baseline",
907 .attrs = elan_baseline_sysfs_entries,
908 };
909
910 static const struct attribute_group *elan_sysfs_groups[] = {
911 &elan_sysfs_group,
912 &elan_baseline_sysfs_group,
913 NULL
914 };
915
916 /*
917 ******************************************************************
918 * Elan isr functions
919 ******************************************************************
920 */
elan_report_contact(struct elan_tp_data * data,int contact_num,bool contact_valid,bool high_precision,u8 * packet,u8 * finger_data)921 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
922 bool contact_valid, bool high_precision,
923 u8 *packet, u8 *finger_data)
924 {
925 struct input_dev *input = data->input;
926 unsigned int pos_x, pos_y;
927 unsigned int pressure, scaled_pressure;
928
929 if (contact_valid) {
930 if (high_precision) {
931 pos_x = get_unaligned_be16(&finger_data[0]);
932 pos_y = get_unaligned_be16(&finger_data[2]);
933 } else {
934 pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
935 pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
936 }
937
938 if (pos_x > data->max_x || pos_y > data->max_y) {
939 dev_dbg(input->dev.parent,
940 "[%d] x=%d y=%d over max (%d, %d)",
941 contact_num, pos_x, pos_y,
942 data->max_x, data->max_y);
943 return;
944 }
945
946 pressure = finger_data[4];
947 scaled_pressure = pressure + data->pressure_adjustment;
948 if (scaled_pressure > ETP_MAX_PRESSURE)
949 scaled_pressure = ETP_MAX_PRESSURE;
950
951 input_mt_slot(input, contact_num);
952 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
953 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
954 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
955 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
956
957 if (data->report_features & ETP_FEATURE_REPORT_MK) {
958 unsigned int mk_x, mk_y, area_x, area_y;
959 u8 mk_data = high_precision ?
960 packet[ETP_MK_DATA_OFFSET + contact_num] :
961 finger_data[3];
962
963 mk_x = mk_data & 0x0f;
964 mk_y = mk_data >> 4;
965
966 /*
967 * To avoid treating large finger as palm, let's reduce
968 * the width x and y per trace.
969 */
970 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
971 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
972
973 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
974 input_report_abs(input, ABS_MT_TOUCH_MAJOR,
975 max(area_x, area_y));
976 input_report_abs(input, ABS_MT_TOUCH_MINOR,
977 min(area_x, area_y));
978 }
979 } else {
980 input_mt_slot(input, contact_num);
981 input_mt_report_slot_inactive(input);
982 }
983 }
984
elan_report_absolute(struct elan_tp_data * data,u8 * packet,bool high_precision)985 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
986 bool high_precision)
987 {
988 struct input_dev *input = data->input;
989 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
990 int i;
991 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
992 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
993 bool contact_valid, hover_event;
994
995 pm_wakeup_event(&data->client->dev, 0);
996
997 hover_event = hover_info & BIT(6);
998
999 for (i = 0; i < ETP_MAX_FINGERS; i++) {
1000 contact_valid = tp_info & BIT(3 + i);
1001 elan_report_contact(data, i, contact_valid, high_precision,
1002 packet, finger_data);
1003 if (contact_valid)
1004 finger_data += ETP_FINGER_DATA_LEN;
1005 }
1006
1007 input_report_key(input, BTN_LEFT, tp_info & BIT(0));
1008 input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1009 input_report_key(input, BTN_RIGHT, tp_info & BIT(1));
1010 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1011 input_mt_report_pointer_emulation(input, true);
1012 input_sync(input);
1013 }
1014
elan_report_trackpoint(struct elan_tp_data * data,u8 * report)1015 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1016 {
1017 struct input_dev *input = data->tp_input;
1018 u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1019 int x, y;
1020
1021 pm_wakeup_event(&data->client->dev, 0);
1022
1023 if (!data->tp_input) {
1024 dev_warn_once(&data->client->dev,
1025 "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1026 return;
1027 }
1028
1029 input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1030 input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1031 input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1032
1033 if ((packet[3] & 0x0F) == 0x06) {
1034 x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1035 y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1036
1037 input_report_rel(input, REL_X, x);
1038 input_report_rel(input, REL_Y, y);
1039 }
1040
1041 input_sync(input);
1042 }
1043
elan_isr(int irq,void * dev_id)1044 static irqreturn_t elan_isr(int irq, void *dev_id)
1045 {
1046 struct elan_tp_data *data = dev_id;
1047 int error;
1048 u8 report[ETP_MAX_REPORT_LEN];
1049
1050 /*
1051 * When device is connected to i2c bus, when all IAP page writes
1052 * complete, the driver will receive interrupt and must read
1053 * 0000 to confirm that IAP is finished.
1054 */
1055 if (data->in_fw_update) {
1056 complete(&data->fw_completion);
1057 goto out;
1058 }
1059
1060 error = data->ops->get_report(data->client, report, data->report_len);
1061 if (error)
1062 goto out;
1063
1064 switch (report[ETP_REPORT_ID_OFFSET]) {
1065 case ETP_REPORT_ID:
1066 elan_report_absolute(data, report, false);
1067 break;
1068 case ETP_REPORT_ID2:
1069 elan_report_absolute(data, report, true);
1070 break;
1071 case ETP_TP_REPORT_ID:
1072 case ETP_TP_REPORT_ID2:
1073 elan_report_trackpoint(data, report);
1074 break;
1075 default:
1076 dev_err(&data->client->dev, "invalid report id data (%x)\n",
1077 report[ETP_REPORT_ID_OFFSET]);
1078 }
1079
1080 out:
1081 return IRQ_HANDLED;
1082 }
1083
1084 /*
1085 ******************************************************************
1086 * Elan initialization functions
1087 ******************************************************************
1088 */
1089
elan_setup_trackpoint_input_device(struct elan_tp_data * data)1090 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1091 {
1092 struct device *dev = &data->client->dev;
1093 struct input_dev *input;
1094
1095 input = devm_input_allocate_device(dev);
1096 if (!input)
1097 return -ENOMEM;
1098
1099 input->name = "Elan TrackPoint";
1100 input->id.bustype = BUS_I2C;
1101 input->id.vendor = ELAN_VENDOR_ID;
1102 input->id.product = data->product_id;
1103 input_set_drvdata(input, data);
1104
1105 input_set_capability(input, EV_REL, REL_X);
1106 input_set_capability(input, EV_REL, REL_Y);
1107 input_set_capability(input, EV_KEY, BTN_LEFT);
1108 input_set_capability(input, EV_KEY, BTN_RIGHT);
1109 input_set_capability(input, EV_KEY, BTN_MIDDLE);
1110
1111 __set_bit(INPUT_PROP_POINTER, input->propbit);
1112 __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1113
1114 data->tp_input = input;
1115
1116 return 0;
1117 }
1118
elan_setup_input_device(struct elan_tp_data * data)1119 static int elan_setup_input_device(struct elan_tp_data *data)
1120 {
1121 struct device *dev = &data->client->dev;
1122 struct input_dev *input;
1123 unsigned int max_width = max(data->width_x, data->width_y);
1124 unsigned int min_width = min(data->width_x, data->width_y);
1125 int error;
1126
1127 input = devm_input_allocate_device(dev);
1128 if (!input)
1129 return -ENOMEM;
1130
1131 input->name = "Elan Touchpad";
1132 input->id.bustype = BUS_I2C;
1133 input->id.vendor = ELAN_VENDOR_ID;
1134 input->id.product = data->product_id;
1135 input_set_drvdata(input, data);
1136
1137 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1138 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1139 if (error) {
1140 dev_err(dev, "failed to initialize MT slots: %d\n", error);
1141 return error;
1142 }
1143
1144 __set_bit(EV_ABS, input->evbit);
1145 __set_bit(INPUT_PROP_POINTER, input->propbit);
1146 if (data->clickpad) {
1147 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1148 } else {
1149 __set_bit(BTN_RIGHT, input->keybit);
1150 if (data->middle_button)
1151 __set_bit(BTN_MIDDLE, input->keybit);
1152 }
1153 __set_bit(BTN_LEFT, input->keybit);
1154
1155 /* Set up ST parameters */
1156 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1157 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1158 input_abs_set_res(input, ABS_X, data->x_res);
1159 input_abs_set_res(input, ABS_Y, data->y_res);
1160 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1161 if (data->report_features & ETP_FEATURE_REPORT_MK)
1162 input_set_abs_params(input, ABS_TOOL_WIDTH,
1163 0, ETP_FINGER_WIDTH, 0, 0);
1164 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1165
1166 /* And MT parameters */
1167 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1168 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1169 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1170 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1171 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1172 ETP_MAX_PRESSURE, 0, 0);
1173 if (data->report_features & ETP_FEATURE_REPORT_MK) {
1174 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1175 0, ETP_FINGER_WIDTH * max_width, 0, 0);
1176 input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1177 0, ETP_FINGER_WIDTH * min_width, 0, 0);
1178 }
1179
1180 data->input = input;
1181
1182 return 0;
1183 }
1184
elan_disable_regulator(void * _data)1185 static void elan_disable_regulator(void *_data)
1186 {
1187 struct elan_tp_data *data = _data;
1188
1189 regulator_disable(data->vcc);
1190 }
1191
elan_probe(struct i2c_client * client)1192 static int elan_probe(struct i2c_client *client)
1193 {
1194 const struct elan_transport_ops *transport_ops;
1195 struct device *dev = &client->dev;
1196 struct elan_tp_data *data;
1197 unsigned long irqflags;
1198 int error;
1199
1200 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1201 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1202 transport_ops = &elan_i2c_ops;
1203 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1204 i2c_check_functionality(client->adapter,
1205 I2C_FUNC_SMBUS_BYTE_DATA |
1206 I2C_FUNC_SMBUS_BLOCK_DATA |
1207 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1208 transport_ops = &elan_smbus_ops;
1209 } else {
1210 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1211 return -EIO;
1212 }
1213
1214 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1215 if (!data)
1216 return -ENOMEM;
1217
1218 i2c_set_clientdata(client, data);
1219
1220 data->ops = transport_ops;
1221 data->client = client;
1222 init_completion(&data->fw_completion);
1223 mutex_init(&data->sysfs_mutex);
1224
1225 data->vcc = devm_regulator_get(dev, "vcc");
1226 if (IS_ERR(data->vcc))
1227 return dev_err_probe(dev, PTR_ERR(data->vcc), "Failed to get 'vcc' regulator\n");
1228
1229 error = regulator_enable(data->vcc);
1230 if (error) {
1231 dev_err(dev, "Failed to enable regulator: %d\n", error);
1232 return error;
1233 }
1234
1235 error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1236 if (error) {
1237 dev_err(dev, "Failed to add disable regulator action: %d\n",
1238 error);
1239 return error;
1240 }
1241
1242 /* Make sure there is something at this address */
1243 error = i2c_smbus_read_byte(client);
1244 if (error < 0) {
1245 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1246 return -ENXIO;
1247 }
1248
1249 /* Initialize the touchpad. */
1250 error = elan_initialize(data, false);
1251 if (error)
1252 return error;
1253
1254 error = elan_query_device_info(data);
1255 if (error)
1256 return error;
1257
1258 error = elan_query_device_parameters(data);
1259 if (error)
1260 return error;
1261
1262 dev_info(dev,
1263 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1264 data->product_id,
1265 data->fw_version,
1266 data->sm_version,
1267 data->iap_version);
1268
1269 dev_dbg(dev,
1270 "Elan Touchpad Extra Information:\n"
1271 " Max ABS X,Y: %d,%d\n"
1272 " Width X,Y: %d,%d\n"
1273 " Resolution X,Y: %d,%d (dots/mm)\n"
1274 " ic type: 0x%x\n"
1275 " info pattern: 0x%x\n",
1276 data->max_x, data->max_y,
1277 data->width_x, data->width_y,
1278 data->x_res, data->y_res,
1279 data->ic_type, data->pattern);
1280
1281 /* Set up input device properties based on queried parameters. */
1282 error = elan_setup_input_device(data);
1283 if (error)
1284 return error;
1285
1286 if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1287 error = elan_setup_trackpoint_input_device(data);
1288 if (error)
1289 return error;
1290 }
1291
1292 /*
1293 * Platform code (ACPI, DTS) should normally set up interrupt
1294 * for us, but in case it did not let's fall back to using falling
1295 * edge to be compatible with older Chromebooks.
1296 */
1297 irqflags = irq_get_trigger_type(client->irq);
1298 if (!irqflags)
1299 irqflags = IRQF_TRIGGER_FALLING;
1300
1301 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1302 irqflags | IRQF_ONESHOT,
1303 client->name, data);
1304 if (error) {
1305 dev_err(dev, "cannot register irq=%d\n", client->irq);
1306 return error;
1307 }
1308
1309 error = input_register_device(data->input);
1310 if (error) {
1311 dev_err(dev, "failed to register input device: %d\n", error);
1312 return error;
1313 }
1314
1315 if (data->tp_input) {
1316 error = input_register_device(data->tp_input);
1317 if (error) {
1318 dev_err(&client->dev,
1319 "failed to register TrackPoint input device: %d\n",
1320 error);
1321 return error;
1322 }
1323 }
1324
1325 return 0;
1326 }
1327
__elan_suspend(struct elan_tp_data * data)1328 static int __elan_suspend(struct elan_tp_data *data)
1329 {
1330 struct i2c_client *client = data->client;
1331 int error;
1332
1333 if (device_may_wakeup(&client->dev))
1334 return elan_sleep(data);
1335
1336 /* Touchpad is not a wakeup source */
1337 error = elan_set_power(data, false);
1338 if (error)
1339 return error;
1340
1341 error = regulator_disable(data->vcc);
1342 if (error) {
1343 dev_err(&client->dev,
1344 "failed to disable regulator when suspending: %d\n",
1345 error);
1346 /* Attempt to power the chip back up */
1347 elan_set_power(data, true);
1348 return error;
1349 }
1350
1351 return 0;
1352 }
1353
elan_suspend(struct device * dev)1354 static int elan_suspend(struct device *dev)
1355 {
1356 struct i2c_client *client = to_i2c_client(dev);
1357 struct elan_tp_data *data = i2c_get_clientdata(client);
1358 int error;
1359
1360 /*
1361 * We are taking the mutex to make sure sysfs operations are
1362 * complete before we attempt to bring the device into low[er]
1363 * power mode.
1364 */
1365 scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
1366 disable_irq(client->irq);
1367
1368 error = __elan_suspend(data);
1369 if (error) {
1370 enable_irq(client->irq);
1371 return error;
1372 }
1373 }
1374
1375 return 0;
1376 }
1377
elan_resume(struct device * dev)1378 static int elan_resume(struct device *dev)
1379 {
1380 struct i2c_client *client = to_i2c_client(dev);
1381 struct elan_tp_data *data = i2c_get_clientdata(client);
1382 int error;
1383
1384 if (!device_may_wakeup(dev)) {
1385 error = regulator_enable(data->vcc);
1386 if (error) {
1387 dev_err(dev, "error %d enabling regulator\n", error);
1388 goto err;
1389 }
1390 }
1391
1392 error = elan_set_power(data, true);
1393 if (error) {
1394 dev_err(dev, "power up when resuming failed: %d\n", error);
1395 goto err;
1396 }
1397
1398 error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1399 if (error)
1400 dev_err(dev, "initialize when resuming failed: %d\n", error);
1401
1402 err:
1403 enable_irq(data->client->irq);
1404 return error;
1405 }
1406
1407 static DEFINE_SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1408
1409 static const struct i2c_device_id elan_id[] = {
1410 { DRIVER_NAME },
1411 { }
1412 };
1413 MODULE_DEVICE_TABLE(i2c, elan_id);
1414
1415 #ifdef CONFIG_ACPI
1416 #include <linux/input/elan-i2c-ids.h>
1417 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1418 #endif
1419
1420 #ifdef CONFIG_OF
1421 static const struct of_device_id elan_of_match[] = {
1422 { .compatible = "elan,ekth3000" },
1423 { /* sentinel */ }
1424 };
1425 MODULE_DEVICE_TABLE(of, elan_of_match);
1426 #endif
1427
1428 static struct i2c_driver elan_driver = {
1429 .driver = {
1430 .name = DRIVER_NAME,
1431 .pm = pm_sleep_ptr(&elan_pm_ops),
1432 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1433 .of_match_table = of_match_ptr(elan_of_match),
1434 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1435 .dev_groups = elan_sysfs_groups,
1436 },
1437 .probe = elan_probe,
1438 .id_table = elan_id,
1439 };
1440
1441 module_i2c_driver(elan_driver);
1442
1443 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1444 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1445 MODULE_LICENSE("GPL");
1446