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net/mlx4: Postpone the registration of net_device
[deliverable/linux.git] / drivers / input / mouse / elan_i2c_core.c
1 /*
2 * Elan I2C/SMBus Touchpad driver
3 *
4 * Copyright (c) 2013 ELAN Microelectronics Corp.
5 *
6 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
7 * Version: 1.5.9
8 *
9 * Based on cyapa driver:
10 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
11 * copyright (c) 2011-2012 Google, Inc.
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License version 2 as published
15 * by the Free Software Foundation.
16 *
17 * Trademarks are the property of their respective owners.
18 */
19
20 #include <linux/acpi.h>
21 #include <linux/delay.h>
22 #include <linux/device.h>
23 #include <linux/firmware.h>
24 #include <linux/i2c.h>
25 #include <linux/init.h>
26 #include <linux/input/mt.h>
27 #include <linux/interrupt.h>
28 #include <linux/module.h>
29 #include <linux/slab.h>
30 #include <linux/kernel.h>
31 #include <linux/sched.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/regulator/consumer.h>
38 #include <asm/unaligned.h>
39
40 #include "elan_i2c.h"
41
42 #define DRIVER_NAME "elan_i2c"
43 #define ELAN_DRIVER_VERSION "1.5.9"
44 #define ETP_MAX_PRESSURE 255
45 #define ETP_FWIDTH_REDUCE 90
46 #define ETP_FINGER_WIDTH 15
47 #define ETP_RETRY_COUNT 3
48
49 #define ETP_MAX_FINGERS 5
50 #define ETP_FINGER_DATA_LEN 5
51 #define ETP_REPORT_ID 0x5D
52 #define ETP_REPORT_ID_OFFSET 2
53 #define ETP_TOUCH_INFO_OFFSET 3
54 #define ETP_FINGER_DATA_OFFSET 4
55 #define ETP_HOVER_INFO_OFFSET 30
56 #define ETP_MAX_REPORT_LEN 34
57
58 /* The main device structure */
59 struct elan_tp_data {
60 struct i2c_client *client;
61 struct input_dev *input;
62 struct regulator *vcc;
63
64 const struct elan_transport_ops *ops;
65
66 /* for fw update */
67 struct completion fw_completion;
68 bool in_fw_update;
69
70 struct mutex sysfs_mutex;
71
72 unsigned int max_x;
73 unsigned int max_y;
74 unsigned int width_x;
75 unsigned int width_y;
76 unsigned int x_res;
77 unsigned int y_res;
78
79 u8 product_id;
80 u8 fw_version;
81 u8 sm_version;
82 u8 iap_version;
83 u16 fw_checksum;
84 int pressure_adjustment;
85 u8 mode;
86 u8 ic_type;
87 u16 fw_vaildpage_count;
88 u16 fw_signature_address;
89
90 bool irq_wake;
91
92 u8 min_baseline;
93 u8 max_baseline;
94 bool baseline_ready;
95 };
96
97 static int elan_get_fwinfo(u8 ic_type, u16 *vaildpage_count,
98 u16 *signature_address)
99 {
100 switch(ic_type) {
101 case 0x09:
102 *vaildpage_count = 768;
103 break;
104 case 0x0D:
105 *vaildpage_count = 896;
106 break;
107 default:
108 /* unknown ic type clear value */
109 *vaildpage_count = 0;
110 *signature_address = 0;
111 return -ENXIO;
112 }
113
114 *signature_address =
115 (*vaildpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
116
117 return 0;
118 }
119
120 static int elan_enable_power(struct elan_tp_data *data)
121 {
122 int repeat = ETP_RETRY_COUNT;
123 int error;
124
125 error = regulator_enable(data->vcc);
126 if (error) {
127 dev_err(&data->client->dev,
128 "failed to enable regulator: %d\n", error);
129 return error;
130 }
131
132 do {
133 error = data->ops->power_control(data->client, true);
134 if (error >= 0)
135 return 0;
136
137 msleep(30);
138 } while (--repeat > 0);
139
140 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
141 return error;
142 }
143
144 static int elan_disable_power(struct elan_tp_data *data)
145 {
146 int repeat = ETP_RETRY_COUNT;
147 int error;
148
149 do {
150 error = data->ops->power_control(data->client, false);
151 if (!error) {
152 error = regulator_disable(data->vcc);
153 if (error) {
154 dev_err(&data->client->dev,
155 "failed to disable regulator: %d\n",
156 error);
157 /* Attempt to power the chip back up */
158 data->ops->power_control(data->client, true);
159 break;
160 }
161
162 return 0;
163 }
164
165 msleep(30);
166 } while (--repeat > 0);
167
168 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
169 return error;
170 }
171
172 static int elan_sleep(struct elan_tp_data *data)
173 {
174 int repeat = ETP_RETRY_COUNT;
175 int error;
176
177 do {
178 error = data->ops->sleep_control(data->client, true);
179 if (!error)
180 return 0;
181
182 msleep(30);
183 } while (--repeat > 0);
184
185 return error;
186 }
187
188 static int __elan_initialize(struct elan_tp_data *data)
189 {
190 struct i2c_client *client = data->client;
191 int error;
192
193 error = data->ops->initialize(client);
194 if (error) {
195 dev_err(&client->dev, "device initialize failed: %d\n", error);
196 return error;
197 }
198
199 data->mode |= ETP_ENABLE_ABS;
200 error = data->ops->set_mode(client, data->mode);
201 if (error) {
202 dev_err(&client->dev,
203 "failed to switch to absolute mode: %d\n", error);
204 return error;
205 }
206
207 error = data->ops->sleep_control(client, false);
208 if (error) {
209 dev_err(&client->dev,
210 "failed to wake device up: %d\n", error);
211 return error;
212 }
213
214 return 0;
215 }
216
217 static int elan_initialize(struct elan_tp_data *data)
218 {
219 int repeat = ETP_RETRY_COUNT;
220 int error;
221
222 do {
223 error = __elan_initialize(data);
224 if (!error)
225 return 0;
226
227 msleep(30);
228 } while (--repeat > 0);
229
230 return error;
231 }
232
233 static int elan_query_device_info(struct elan_tp_data *data)
234 {
235 int error;
236
237 error = data->ops->get_product_id(data->client, &data->product_id);
238 if (error)
239 return error;
240
241 error = data->ops->get_version(data->client, false, &data->fw_version);
242 if (error)
243 return error;
244
245 error = data->ops->get_checksum(data->client, false,
246 &data->fw_checksum);
247 if (error)
248 return error;
249
250 error = data->ops->get_sm_version(data->client, &data->ic_type,
251 &data->sm_version);
252 if (error)
253 return error;
254
255 error = data->ops->get_version(data->client, true, &data->iap_version);
256 if (error)
257 return error;
258
259 error = data->ops->get_pressure_adjustment(data->client,
260 &data->pressure_adjustment);
261 if (error)
262 return error;
263
264 error = elan_get_fwinfo(data->ic_type, &data->fw_vaildpage_count,
265 &data->fw_signature_address);
266 if (error) {
267 dev_err(&data->client->dev,
268 "unknown ic type %d\n", data->ic_type);
269 return error;
270 }
271
272 return 0;
273 }
274
275 static unsigned int elan_convert_resolution(u8 val)
276 {
277 /*
278 * (value from firmware) * 10 + 790 = dpi
279 *
280 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
281 * point).
282 */
283
284 return ((int)(char)val * 10 + 790) * 10 / 254;
285 }
286
287 static int elan_query_device_parameters(struct elan_tp_data *data)
288 {
289 unsigned int x_traces, y_traces;
290 u8 hw_x_res, hw_y_res;
291 int error;
292
293 error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
294 if (error)
295 return error;
296
297 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
298 if (error)
299 return error;
300
301 data->width_x = data->max_x / x_traces;
302 data->width_y = data->max_y / y_traces;
303
304 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
305 if (error)
306 return error;
307
308 data->x_res = elan_convert_resolution(hw_x_res);
309 data->y_res = elan_convert_resolution(hw_y_res);
310
311 return 0;
312 }
313
314 /*
315 **********************************************************
316 * IAP firmware updater related routines
317 **********************************************************
318 */
319 static int elan_write_fw_block(struct elan_tp_data *data,
320 const u8 *page, u16 checksum, int idx)
321 {
322 int retry = ETP_RETRY_COUNT;
323 int error;
324
325 do {
326 error = data->ops->write_fw_block(data->client,
327 page, checksum, idx);
328 if (!error)
329 return 0;
330
331 dev_dbg(&data->client->dev,
332 "IAP retrying page %d (error: %d)\n", idx, error);
333 } while (--retry > 0);
334
335 return error;
336 }
337
338 static int __elan_update_firmware(struct elan_tp_data *data,
339 const struct firmware *fw)
340 {
341 struct i2c_client *client = data->client;
342 struct device *dev = &client->dev;
343 int i, j;
344 int error;
345 u16 iap_start_addr;
346 u16 boot_page_count;
347 u16 sw_checksum = 0, fw_checksum = 0;
348
349 error = data->ops->prepare_fw_update(client);
350 if (error)
351 return error;
352
353 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
354
355 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
356 for (i = boot_page_count; i < data->fw_vaildpage_count; i++) {
357 u16 checksum = 0;
358 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
359
360 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
361 checksum += ((page[j + 1] << 8) | page[j]);
362
363 error = elan_write_fw_block(data, page, checksum, i);
364 if (error) {
365 dev_err(dev, "write page %d fail: %d\n", i, error);
366 return error;
367 }
368
369 sw_checksum += checksum;
370 }
371
372 /* Wait WDT reset and power on reset */
373 msleep(600);
374
375 error = data->ops->finish_fw_update(client, &data->fw_completion);
376 if (error)
377 return error;
378
379 error = data->ops->get_checksum(client, true, &fw_checksum);
380 if (error)
381 return error;
382
383 if (sw_checksum != fw_checksum) {
384 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
385 sw_checksum, fw_checksum);
386 return -EIO;
387 }
388
389 return 0;
390 }
391
392 static int elan_update_firmware(struct elan_tp_data *data,
393 const struct firmware *fw)
394 {
395 struct i2c_client *client = data->client;
396 int retval;
397
398 dev_dbg(&client->dev, "Starting firmware update....\n");
399
400 disable_irq(client->irq);
401 data->in_fw_update = true;
402
403 retval = __elan_update_firmware(data, fw);
404 if (retval) {
405 dev_err(&client->dev, "firmware update failed: %d\n", retval);
406 data->ops->iap_reset(client);
407 } else {
408 /* Reinitialize TP after fw is updated */
409 elan_initialize(data);
410 elan_query_device_info(data);
411 }
412
413 data->in_fw_update = false;
414 enable_irq(client->irq);
415
416 return retval;
417 }
418
419 /*
420 *******************************************************************
421 * SYSFS attributes
422 *******************************************************************
423 */
424 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
425 struct device_attribute *attr,
426 char *buf)
427 {
428 struct i2c_client *client = to_i2c_client(dev);
429 struct elan_tp_data *data = i2c_get_clientdata(client);
430
431 return sprintf(buf, "0x%04x\n", data->fw_checksum);
432 }
433
434 static ssize_t elan_sysfs_read_product_id(struct device *dev,
435 struct device_attribute *attr,
436 char *buf)
437 {
438 struct i2c_client *client = to_i2c_client(dev);
439 struct elan_tp_data *data = i2c_get_clientdata(client);
440
441 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
442 data->product_id);
443 }
444
445 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
446 struct device_attribute *attr,
447 char *buf)
448 {
449 struct i2c_client *client = to_i2c_client(dev);
450 struct elan_tp_data *data = i2c_get_clientdata(client);
451
452 return sprintf(buf, "%d.0\n", data->fw_version);
453 }
454
455 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
456 struct device_attribute *attr,
457 char *buf)
458 {
459 struct i2c_client *client = to_i2c_client(dev);
460 struct elan_tp_data *data = i2c_get_clientdata(client);
461
462 return sprintf(buf, "%d.0\n", data->sm_version);
463 }
464
465 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
466 struct device_attribute *attr,
467 char *buf)
468 {
469 struct i2c_client *client = to_i2c_client(dev);
470 struct elan_tp_data *data = i2c_get_clientdata(client);
471
472 return sprintf(buf, "%d.0\n", data->iap_version);
473 }
474
475 static ssize_t elan_sysfs_update_fw(struct device *dev,
476 struct device_attribute *attr,
477 const char *buf, size_t count)
478 {
479 struct elan_tp_data *data = dev_get_drvdata(dev);
480 const struct firmware *fw;
481 char *fw_name;
482 int error;
483 const u8 *fw_signature;
484 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
485
486 /* Look for a firmware with the product id appended. */
487 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
488 if (!fw_name) {
489 dev_err(dev, "failed to allocate memory for firmware name\n");
490 return -ENOMEM;
491 }
492
493 dev_info(dev, "requesting fw '%s'\n", fw_name);
494 error = request_firmware(&fw, fw_name, dev);
495 kfree(fw_name);
496 if (error) {
497 dev_err(dev, "failed to request firmware: %d\n", error);
498 return error;
499 }
500
501 /* Firmware file must match signature data */
502 fw_signature = &fw->data[data->fw_signature_address];
503 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
504 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
505 (int)sizeof(signature), signature,
506 (int)sizeof(signature), fw_signature);
507 error = -EBADF;
508 goto out_release_fw;
509 }
510
511 error = mutex_lock_interruptible(&data->sysfs_mutex);
512 if (error)
513 goto out_release_fw;
514
515 error = elan_update_firmware(data, fw);
516
517 mutex_unlock(&data->sysfs_mutex);
518
519 out_release_fw:
520 release_firmware(fw);
521 return error ?: count;
522 }
523
524 static ssize_t calibrate_store(struct device *dev,
525 struct device_attribute *attr,
526 const char *buf, size_t count)
527 {
528 struct i2c_client *client = to_i2c_client(dev);
529 struct elan_tp_data *data = i2c_get_clientdata(client);
530 int tries = 20;
531 int retval;
532 int error;
533 u8 val[3];
534
535 retval = mutex_lock_interruptible(&data->sysfs_mutex);
536 if (retval)
537 return retval;
538
539 disable_irq(client->irq);
540
541 data->mode |= ETP_ENABLE_CALIBRATE;
542 retval = data->ops->set_mode(client, data->mode);
543 if (retval) {
544 dev_err(dev, "failed to enable calibration mode: %d\n",
545 retval);
546 goto out;
547 }
548
549 retval = data->ops->calibrate(client);
550 if (retval) {
551 dev_err(dev, "failed to start calibration: %d\n",
552 retval);
553 goto out_disable_calibrate;
554 }
555
556 val[0] = 0xff;
557 do {
558 /* Wait 250ms before checking if calibration has completed. */
559 msleep(250);
560
561 retval = data->ops->calibrate_result(client, val);
562 if (retval)
563 dev_err(dev, "failed to check calibration result: %d\n",
564 retval);
565 else if (val[0] == 0)
566 break; /* calibration done */
567
568 } while (--tries);
569
570 if (tries == 0) {
571 dev_err(dev, "failed to calibrate. Timeout.\n");
572 retval = -ETIMEDOUT;
573 }
574
575 out_disable_calibrate:
576 data->mode &= ~ETP_ENABLE_CALIBRATE;
577 error = data->ops->set_mode(data->client, data->mode);
578 if (error) {
579 dev_err(dev, "failed to disable calibration mode: %d\n",
580 error);
581 if (!retval)
582 retval = error;
583 }
584 out:
585 enable_irq(client->irq);
586 mutex_unlock(&data->sysfs_mutex);
587 return retval ?: count;
588 }
589
590 static ssize_t elan_sysfs_read_mode(struct device *dev,
591 struct device_attribute *attr,
592 char *buf)
593 {
594 struct i2c_client *client = to_i2c_client(dev);
595 struct elan_tp_data *data = i2c_get_clientdata(client);
596 int error;
597 enum tp_mode mode;
598
599 error = mutex_lock_interruptible(&data->sysfs_mutex);
600 if (error)
601 return error;
602
603 error = data->ops->iap_get_mode(data->client, &mode);
604
605 mutex_unlock(&data->sysfs_mutex);
606
607 if (error)
608 return error;
609
610 return sprintf(buf, "%d\n", (int)mode);
611 }
612
613 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
614 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
615 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
616 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
617 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
618 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
619 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
620
621 static DEVICE_ATTR_WO(calibrate);
622
623 static struct attribute *elan_sysfs_entries[] = {
624 &dev_attr_product_id.attr,
625 &dev_attr_firmware_version.attr,
626 &dev_attr_sample_version.attr,
627 &dev_attr_iap_version.attr,
628 &dev_attr_fw_checksum.attr,
629 &dev_attr_calibrate.attr,
630 &dev_attr_mode.attr,
631 &dev_attr_update_fw.attr,
632 NULL,
633 };
634
635 static const struct attribute_group elan_sysfs_group = {
636 .attrs = elan_sysfs_entries,
637 };
638
639 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
640 const char *buf, size_t count)
641 {
642 struct i2c_client *client = to_i2c_client(dev);
643 struct elan_tp_data *data = i2c_get_clientdata(client);
644 int error;
645 int retval;
646
647 retval = mutex_lock_interruptible(&data->sysfs_mutex);
648 if (retval)
649 return retval;
650
651 disable_irq(client->irq);
652
653 data->baseline_ready = false;
654
655 data->mode |= ETP_ENABLE_CALIBRATE;
656 retval = data->ops->set_mode(data->client, data->mode);
657 if (retval) {
658 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
659 retval);
660 goto out;
661 }
662
663 msleep(250);
664
665 retval = data->ops->get_baseline_data(data->client, true,
666 &data->max_baseline);
667 if (retval) {
668 dev_err(dev, "Failed to read max baseline form device: %d\n",
669 retval);
670 goto out_disable_calibrate;
671 }
672
673 retval = data->ops->get_baseline_data(data->client, false,
674 &data->min_baseline);
675 if (retval) {
676 dev_err(dev, "Failed to read min baseline form device: %d\n",
677 retval);
678 goto out_disable_calibrate;
679 }
680
681 data->baseline_ready = true;
682
683 out_disable_calibrate:
684 data->mode &= ~ETP_ENABLE_CALIBRATE;
685 error = data->ops->set_mode(data->client, data->mode);
686 if (error) {
687 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
688 error);
689 if (!retval)
690 retval = error;
691 }
692 out:
693 enable_irq(client->irq);
694 mutex_unlock(&data->sysfs_mutex);
695 return retval ?: count;
696 }
697
698 static ssize_t min_show(struct device *dev,
699 struct device_attribute *attr, char *buf)
700 {
701 struct i2c_client *client = to_i2c_client(dev);
702 struct elan_tp_data *data = i2c_get_clientdata(client);
703 int retval;
704
705 retval = mutex_lock_interruptible(&data->sysfs_mutex);
706 if (retval)
707 return retval;
708
709 if (!data->baseline_ready) {
710 retval = -ENODATA;
711 goto out;
712 }
713
714 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
715
716 out:
717 mutex_unlock(&data->sysfs_mutex);
718 return retval;
719 }
720
721 static ssize_t max_show(struct device *dev,
722 struct device_attribute *attr, char *buf)
723 {
724 struct i2c_client *client = to_i2c_client(dev);
725 struct elan_tp_data *data = i2c_get_clientdata(client);
726 int retval;
727
728 retval = mutex_lock_interruptible(&data->sysfs_mutex);
729 if (retval)
730 return retval;
731
732 if (!data->baseline_ready) {
733 retval = -ENODATA;
734 goto out;
735 }
736
737 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
738
739 out:
740 mutex_unlock(&data->sysfs_mutex);
741 return retval;
742 }
743
744
745 static DEVICE_ATTR_WO(acquire);
746 static DEVICE_ATTR_RO(min);
747 static DEVICE_ATTR_RO(max);
748
749 static struct attribute *elan_baseline_sysfs_entries[] = {
750 &dev_attr_acquire.attr,
751 &dev_attr_min.attr,
752 &dev_attr_max.attr,
753 NULL,
754 };
755
756 static const struct attribute_group elan_baseline_sysfs_group = {
757 .name = "baseline",
758 .attrs = elan_baseline_sysfs_entries,
759 };
760
761 static const struct attribute_group *elan_sysfs_groups[] = {
762 &elan_sysfs_group,
763 &elan_baseline_sysfs_group,
764 NULL
765 };
766
767 /*
768 ******************************************************************
769 * Elan isr functions
770 ******************************************************************
771 */
772 static void elan_report_contact(struct elan_tp_data *data,
773 int contact_num, bool contact_valid,
774 u8 *finger_data)
775 {
776 struct input_dev *input = data->input;
777 unsigned int pos_x, pos_y;
778 unsigned int pressure, mk_x, mk_y;
779 unsigned int area_x, area_y, major, minor;
780 unsigned int scaled_pressure;
781
782 if (contact_valid) {
783 pos_x = ((finger_data[0] & 0xf0) << 4) |
784 finger_data[1];
785 pos_y = ((finger_data[0] & 0x0f) << 8) |
786 finger_data[2];
787 mk_x = (finger_data[3] & 0x0f);
788 mk_y = (finger_data[3] >> 4);
789 pressure = finger_data[4];
790
791 if (pos_x > data->max_x || pos_y > data->max_y) {
792 dev_dbg(input->dev.parent,
793 "[%d] x=%d y=%d over max (%d, %d)",
794 contact_num, pos_x, pos_y,
795 data->max_x, data->max_y);
796 return;
797 }
798
799 /*
800 * To avoid treating large finger as palm, let's reduce the
801 * width x and y per trace.
802 */
803 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
804 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
805
806 major = max(area_x, area_y);
807 minor = min(area_x, area_y);
808
809 scaled_pressure = pressure + data->pressure_adjustment;
810
811 if (scaled_pressure > ETP_MAX_PRESSURE)
812 scaled_pressure = ETP_MAX_PRESSURE;
813
814 input_mt_slot(input, contact_num);
815 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
816 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
817 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
818 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
819 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
820 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
821 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
822 } else {
823 input_mt_slot(input, contact_num);
824 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
825 }
826 }
827
828 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
829 {
830 struct input_dev *input = data->input;
831 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
832 int i;
833 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
834 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
835 bool contact_valid, hover_event;
836
837 hover_event = hover_info & 0x40;
838 for (i = 0; i < ETP_MAX_FINGERS; i++) {
839 contact_valid = tp_info & (1U << (3 + i));
840 elan_report_contact(data, i, contact_valid, finger_data);
841
842 if (contact_valid)
843 finger_data += ETP_FINGER_DATA_LEN;
844 }
845
846 input_report_key(input, BTN_LEFT, tp_info & 0x01);
847 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
848 input_mt_report_pointer_emulation(input, true);
849 input_sync(input);
850 }
851
852 static irqreturn_t elan_isr(int irq, void *dev_id)
853 {
854 struct elan_tp_data *data = dev_id;
855 struct device *dev = &data->client->dev;
856 int error;
857 u8 report[ETP_MAX_REPORT_LEN];
858
859 /*
860 * When device is connected to i2c bus, when all IAP page writes
861 * complete, the driver will receive interrupt and must read
862 * 0000 to confirm that IAP is finished.
863 */
864 if (data->in_fw_update) {
865 complete(&data->fw_completion);
866 goto out;
867 }
868
869 error = data->ops->get_report(data->client, report);
870 if (error)
871 goto out;
872
873 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
874 dev_err(dev, "invalid report id data (%x)\n",
875 report[ETP_REPORT_ID_OFFSET]);
876 else
877 elan_report_absolute(data, report);
878
879 out:
880 return IRQ_HANDLED;
881 }
882
883 /*
884 ******************************************************************
885 * Elan initialization functions
886 ******************************************************************
887 */
888 static int elan_setup_input_device(struct elan_tp_data *data)
889 {
890 struct device *dev = &data->client->dev;
891 struct input_dev *input;
892 unsigned int max_width = max(data->width_x, data->width_y);
893 unsigned int min_width = min(data->width_x, data->width_y);
894 int error;
895
896 input = devm_input_allocate_device(dev);
897 if (!input)
898 return -ENOMEM;
899
900 input->name = "Elan Touchpad";
901 input->id.bustype = BUS_I2C;
902 input_set_drvdata(input, data);
903
904 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
905 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
906 if (error) {
907 dev_err(dev, "failed to initialize MT slots: %d\n", error);
908 return error;
909 }
910
911 __set_bit(EV_ABS, input->evbit);
912 __set_bit(INPUT_PROP_POINTER, input->propbit);
913 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
914 __set_bit(BTN_LEFT, input->keybit);
915
916 /* Set up ST parameters */
917 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
918 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
919 input_abs_set_res(input, ABS_X, data->x_res);
920 input_abs_set_res(input, ABS_Y, data->y_res);
921 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
922 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
923 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
924
925 /* And MT parameters */
926 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
927 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
928 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
929 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
930 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
931 ETP_MAX_PRESSURE, 0, 0);
932 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
933 ETP_FINGER_WIDTH * max_width, 0, 0);
934 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
935 ETP_FINGER_WIDTH * min_width, 0, 0);
936
937 data->input = input;
938
939 return 0;
940 }
941
942 static void elan_disable_regulator(void *_data)
943 {
944 struct elan_tp_data *data = _data;
945
946 regulator_disable(data->vcc);
947 }
948
949 static void elan_remove_sysfs_groups(void *_data)
950 {
951 struct elan_tp_data *data = _data;
952
953 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
954 }
955
956 static int elan_probe(struct i2c_client *client,
957 const struct i2c_device_id *dev_id)
958 {
959 const struct elan_transport_ops *transport_ops;
960 struct device *dev = &client->dev;
961 struct elan_tp_data *data;
962 unsigned long irqflags;
963 int error;
964
965 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
966 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
967 transport_ops = &elan_i2c_ops;
968 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
969 i2c_check_functionality(client->adapter,
970 I2C_FUNC_SMBUS_BYTE_DATA |
971 I2C_FUNC_SMBUS_BLOCK_DATA |
972 I2C_FUNC_SMBUS_I2C_BLOCK)) {
973 transport_ops = &elan_smbus_ops;
974 } else {
975 dev_err(dev, "not a supported I2C/SMBus adapter\n");
976 return -EIO;
977 }
978
979 data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data),
980 GFP_KERNEL);
981 if (!data)
982 return -ENOMEM;
983
984 i2c_set_clientdata(client, data);
985
986 data->ops = transport_ops;
987 data->client = client;
988 init_completion(&data->fw_completion);
989 mutex_init(&data->sysfs_mutex);
990
991 data->vcc = devm_regulator_get(&client->dev, "vcc");
992 if (IS_ERR(data->vcc)) {
993 error = PTR_ERR(data->vcc);
994 if (error != -EPROBE_DEFER)
995 dev_err(&client->dev,
996 "Failed to get 'vcc' regulator: %d\n",
997 error);
998 return error;
999 }
1000
1001 error = regulator_enable(data->vcc);
1002 if (error) {
1003 dev_err(&client->dev,
1004 "Failed to enable regulator: %d\n", error);
1005 return error;
1006 }
1007
1008 error = devm_add_action(&client->dev,
1009 elan_disable_regulator, data);
1010 if (error) {
1011 regulator_disable(data->vcc);
1012 dev_err(&client->dev,
1013 "Failed to add disable regulator action: %d\n",
1014 error);
1015 return error;
1016 }
1017
1018 /* Initialize the touchpad. */
1019 error = elan_initialize(data);
1020 if (error)
1021 return error;
1022
1023 error = elan_query_device_info(data);
1024 if (error)
1025 return error;
1026
1027 error = elan_query_device_parameters(data);
1028 if (error)
1029 return error;
1030
1031 dev_dbg(&client->dev,
1032 "Elan Touchpad Information:\n"
1033 " Module product ID: 0x%04x\n"
1034 " Firmware Version: 0x%04x\n"
1035 " Sample Version: 0x%04x\n"
1036 " IAP Version: 0x%04x\n"
1037 " Max ABS X,Y: %d,%d\n"
1038 " Width X,Y: %d,%d\n"
1039 " Resolution X,Y: %d,%d (dots/mm)\n",
1040 data->product_id,
1041 data->fw_version,
1042 data->sm_version,
1043 data->iap_version,
1044 data->max_x, data->max_y,
1045 data->width_x, data->width_y,
1046 data->x_res, data->y_res);
1047
1048 /* Set up input device properties based on queried parameters. */
1049 error = elan_setup_input_device(data);
1050 if (error)
1051 return error;
1052
1053 /*
1054 * Systems using device tree should set up interrupt via DTS,
1055 * the rest will use the default falling edge interrupts.
1056 */
1057 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1058
1059 error = devm_request_threaded_irq(&client->dev, client->irq,
1060 NULL, elan_isr,
1061 irqflags | IRQF_ONESHOT,
1062 client->name, data);
1063 if (error) {
1064 dev_err(&client->dev, "cannot register irq=%d\n", client->irq);
1065 return error;
1066 }
1067
1068 error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups);
1069 if (error) {
1070 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1071 error);
1072 return error;
1073 }
1074
1075 error = devm_add_action(&client->dev,
1076 elan_remove_sysfs_groups, data);
1077 if (error) {
1078 elan_remove_sysfs_groups(data);
1079 dev_err(&client->dev,
1080 "Failed to add sysfs cleanup action: %d\n",
1081 error);
1082 return error;
1083 }
1084
1085 error = input_register_device(data->input);
1086 if (error) {
1087 dev_err(&client->dev, "failed to register input device: %d\n",
1088 error);
1089 return error;
1090 }
1091
1092 /*
1093 * Systems using device tree should set up wakeup via DTS,
1094 * the rest will configure device as wakeup source by default.
1095 */
1096 if (!client->dev.of_node)
1097 device_init_wakeup(&client->dev, true);
1098
1099 return 0;
1100 }
1101
1102 static int __maybe_unused elan_suspend(struct device *dev)
1103 {
1104 struct i2c_client *client = to_i2c_client(dev);
1105 struct elan_tp_data *data = i2c_get_clientdata(client);
1106 int ret;
1107
1108 /*
1109 * We are taking the mutex to make sure sysfs operations are
1110 * complete before we attempt to bring the device into low[er]
1111 * power mode.
1112 */
1113 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1114 if (ret)
1115 return ret;
1116
1117 disable_irq(client->irq);
1118
1119 if (device_may_wakeup(dev)) {
1120 ret = elan_sleep(data);
1121 /* Enable wake from IRQ */
1122 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1123 } else {
1124 ret = elan_disable_power(data);
1125 }
1126
1127 mutex_unlock(&data->sysfs_mutex);
1128 return ret;
1129 }
1130
1131 static int __maybe_unused elan_resume(struct device *dev)
1132 {
1133 struct i2c_client *client = to_i2c_client(dev);
1134 struct elan_tp_data *data = i2c_get_clientdata(client);
1135 int error;
1136
1137 if (device_may_wakeup(dev) && data->irq_wake) {
1138 disable_irq_wake(client->irq);
1139 data->irq_wake = false;
1140 }
1141
1142 error = elan_enable_power(data);
1143 if (error) {
1144 dev_err(dev, "power up when resuming failed: %d\n", error);
1145 goto err;
1146 }
1147
1148 error = elan_initialize(data);
1149 if (error)
1150 dev_err(dev, "initialize when resuming failed: %d\n", error);
1151
1152 err:
1153 enable_irq(data->client->irq);
1154 return error;
1155 }
1156
1157 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1158
1159 static const struct i2c_device_id elan_id[] = {
1160 { DRIVER_NAME, 0 },
1161 { },
1162 };
1163 MODULE_DEVICE_TABLE(i2c, elan_id);
1164
1165 #ifdef CONFIG_ACPI
1166 static const struct acpi_device_id elan_acpi_id[] = {
1167 { "ELAN0000", 0 },
1168 { }
1169 };
1170 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1171 #endif
1172
1173 #ifdef CONFIG_OF
1174 static const struct of_device_id elan_of_match[] = {
1175 { .compatible = "elan,ekth3000" },
1176 { /* sentinel */ }
1177 };
1178 MODULE_DEVICE_TABLE(of, elan_of_match);
1179 #endif
1180
1181 static struct i2c_driver elan_driver = {
1182 .driver = {
1183 .name = DRIVER_NAME,
1184 .owner = THIS_MODULE,
1185 .pm = &elan_pm_ops,
1186 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1187 .of_match_table = of_match_ptr(elan_of_match),
1188 },
1189 .probe = elan_probe,
1190 .id_table = elan_id,
1191 };
1192
1193 module_i2c_driver(elan_driver);
1194
1195 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1196 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1197 MODULE_LICENSE("GPL");
1198 MODULE_VERSION(ELAN_DRIVER_VERSION);
Linux kernel - Deliverables
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