2 * Elan I2C/SMBus Touchpad driver
4 * Copyright (c) 2013 ELAN Microelectronics Corp.
6 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
7 * Author: KT Liao <kt.liao@emc.com.tw>
10 * Based on cyapa driver:
11 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
12 * copyright (c) 2011-2012 Google, Inc.
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License version 2 as published
16 * by the Free Software Foundation.
18 * Trademarks are the property of their respective owners.
21 #include <linux/acpi.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/firmware.h>
25 #include <linux/i2c.h>
26 #include <linux/init.h>
27 #include <linux/input/mt.h>
28 #include <linux/interrupt.h>
29 #include <linux/module.h>
30 #include <linux/slab.h>
31 #include <linux/kernel.h>
32 #include <linux/sched.h>
33 #include <linux/input.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <linux/completion.h>
38 #include <linux/regulator/consumer.h>
39 #include <asm/unaligned.h>
43 #define DRIVER_NAME "elan_i2c"
44 #define ELAN_DRIVER_VERSION "1.6.2"
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
51 #define ETP_MAX_FINGERS 5
52 #define ETP_FINGER_DATA_LEN 5
53 #define ETP_REPORT_ID 0x5D
54 #define ETP_REPORT_ID_OFFSET 2
55 #define ETP_TOUCH_INFO_OFFSET 3
56 #define ETP_FINGER_DATA_OFFSET 4
57 #define ETP_HOVER_INFO_OFFSET 30
58 #define ETP_MAX_REPORT_LEN 34
60 /* The main device structure */
62 struct i2c_client *client;
63 struct input_dev *input;
64 struct regulator *vcc;
66 const struct elan_transport_ops *ops;
69 struct completion fw_completion;
72 struct mutex sysfs_mutex;
86 int pressure_adjustment;
89 u16 fw_validpage_count;
90 u16 fw_signature_address;
99 static int elan_get_fwinfo(u8 iap_version, u16 *validpage_count,
100 u16 *signature_address)
102 switch (iap_version) {
106 *validpage_count = 512;
114 *validpage_count = 768;
117 *validpage_count = 896;
120 *validpage_count = 640;
123 /* unknown ic type clear value */
124 *validpage_count = 0;
125 *signature_address = 0;
130 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
135 static int elan_enable_power(struct elan_tp_data *data)
137 int repeat = ETP_RETRY_COUNT;
140 error = regulator_enable(data->vcc);
142 dev_err(&data->client->dev,
143 "failed to enable regulator: %d\n", error);
148 error = data->ops->power_control(data->client, true);
153 } while (--repeat > 0);
155 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
159 static int elan_disable_power(struct elan_tp_data *data)
161 int repeat = ETP_RETRY_COUNT;
165 error = data->ops->power_control(data->client, false);
167 error = regulator_disable(data->vcc);
169 dev_err(&data->client->dev,
170 "failed to disable regulator: %d\n",
172 /* Attempt to power the chip back up */
173 data->ops->power_control(data->client, true);
181 } while (--repeat > 0);
183 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
187 static int elan_sleep(struct elan_tp_data *data)
189 int repeat = ETP_RETRY_COUNT;
193 error = data->ops->sleep_control(data->client, true);
198 } while (--repeat > 0);
203 static int elan_query_product(struct elan_tp_data *data)
207 error = data->ops->get_product_id(data->client, &data->product_id);
211 error = data->ops->get_sm_version(data->client, &data->ic_type,
219 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
221 if (data->ic_type == 0x0E) {
222 switch (data->product_id) {
228 } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
229 /* ASUS EeeBook X205TA */
236 static int __elan_initialize(struct elan_tp_data *data)
238 struct i2c_client *client = data->client;
239 bool woken_up = false;
242 error = data->ops->initialize(client);
244 dev_err(&client->dev, "device initialize failed: %d\n", error);
248 error = elan_query_product(data);
253 * Some ASUS devices were shipped with firmware that requires
254 * touchpads to be woken up first, before attempting to switch
255 * them into absolute reporting mode.
257 if (elan_check_ASUS_special_fw(data)) {
258 error = data->ops->sleep_control(client, false);
260 dev_err(&client->dev,
261 "failed to wake device up: %d\n", error);
269 data->mode |= ETP_ENABLE_ABS;
270 error = data->ops->set_mode(client, data->mode);
272 dev_err(&client->dev,
273 "failed to switch to absolute mode: %d\n", error);
278 error = data->ops->sleep_control(client, false);
280 dev_err(&client->dev,
281 "failed to wake device up: %d\n", error);
289 static int elan_initialize(struct elan_tp_data *data)
291 int repeat = ETP_RETRY_COUNT;
295 error = __elan_initialize(data);
300 } while (--repeat > 0);
305 static int elan_query_device_info(struct elan_tp_data *data)
309 error = data->ops->get_version(data->client, false, &data->fw_version);
313 error = data->ops->get_checksum(data->client, false,
318 error = data->ops->get_version(data->client, true, &data->iap_version);
322 error = data->ops->get_pressure_adjustment(data->client,
323 &data->pressure_adjustment);
327 error = elan_get_fwinfo(data->iap_version, &data->fw_validpage_count,
328 &data->fw_signature_address);
330 dev_warn(&data->client->dev,
331 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
332 data->iap_version, data->ic_type);
337 static unsigned int elan_convert_resolution(u8 val)
340 * (value from firmware) * 10 + 790 = dpi
342 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
346 return ((int)(char)val * 10 + 790) * 10 / 254;
349 static int elan_query_device_parameters(struct elan_tp_data *data)
351 unsigned int x_traces, y_traces;
352 u8 hw_x_res, hw_y_res;
355 error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
359 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
363 data->width_x = data->max_x / x_traces;
364 data->width_y = data->max_y / y_traces;
366 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
370 data->x_res = elan_convert_resolution(hw_x_res);
371 data->y_res = elan_convert_resolution(hw_y_res);
377 **********************************************************
378 * IAP firmware updater related routines
379 **********************************************************
381 static int elan_write_fw_block(struct elan_tp_data *data,
382 const u8 *page, u16 checksum, int idx)
384 int retry = ETP_RETRY_COUNT;
388 error = data->ops->write_fw_block(data->client,
389 page, checksum, idx);
393 dev_dbg(&data->client->dev,
394 "IAP retrying page %d (error: %d)\n", idx, error);
395 } while (--retry > 0);
400 static int __elan_update_firmware(struct elan_tp_data *data,
401 const struct firmware *fw)
403 struct i2c_client *client = data->client;
404 struct device *dev = &client->dev;
409 u16 sw_checksum = 0, fw_checksum = 0;
411 error = data->ops->prepare_fw_update(client);
415 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
417 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
418 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
420 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
422 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
423 checksum += ((page[j + 1] << 8) | page[j]);
425 error = elan_write_fw_block(data, page, checksum, i);
427 dev_err(dev, "write page %d fail: %d\n", i, error);
431 sw_checksum += checksum;
434 /* Wait WDT reset and power on reset */
437 error = data->ops->finish_fw_update(client, &data->fw_completion);
441 error = data->ops->get_checksum(client, true, &fw_checksum);
445 if (sw_checksum != fw_checksum) {
446 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
447 sw_checksum, fw_checksum);
454 static int elan_update_firmware(struct elan_tp_data *data,
455 const struct firmware *fw)
457 struct i2c_client *client = data->client;
460 dev_dbg(&client->dev, "Starting firmware update....\n");
462 disable_irq(client->irq);
463 data->in_fw_update = true;
465 retval = __elan_update_firmware(data, fw);
467 dev_err(&client->dev, "firmware update failed: %d\n", retval);
468 data->ops->iap_reset(client);
470 /* Reinitialize TP after fw is updated */
471 elan_initialize(data);
472 elan_query_device_info(data);
475 data->in_fw_update = false;
476 enable_irq(client->irq);
482 *******************************************************************
484 *******************************************************************
486 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
487 struct device_attribute *attr,
490 struct i2c_client *client = to_i2c_client(dev);
491 struct elan_tp_data *data = i2c_get_clientdata(client);
493 return sprintf(buf, "0x%04x\n", data->fw_checksum);
496 static ssize_t elan_sysfs_read_product_id(struct device *dev,
497 struct device_attribute *attr,
500 struct i2c_client *client = to_i2c_client(dev);
501 struct elan_tp_data *data = i2c_get_clientdata(client);
503 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
507 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
508 struct device_attribute *attr,
511 struct i2c_client *client = to_i2c_client(dev);
512 struct elan_tp_data *data = i2c_get_clientdata(client);
514 return sprintf(buf, "%d.0\n", data->fw_version);
517 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
518 struct device_attribute *attr,
521 struct i2c_client *client = to_i2c_client(dev);
522 struct elan_tp_data *data = i2c_get_clientdata(client);
524 return sprintf(buf, "%d.0\n", data->sm_version);
527 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
528 struct device_attribute *attr,
531 struct i2c_client *client = to_i2c_client(dev);
532 struct elan_tp_data *data = i2c_get_clientdata(client);
534 return sprintf(buf, "%d.0\n", data->iap_version);
537 static ssize_t elan_sysfs_update_fw(struct device *dev,
538 struct device_attribute *attr,
539 const char *buf, size_t count)
541 struct elan_tp_data *data = dev_get_drvdata(dev);
542 const struct firmware *fw;
545 const u8 *fw_signature;
546 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
548 if (data->fw_validpage_count == 0)
551 /* Look for a firmware with the product id appended. */
552 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
554 dev_err(dev, "failed to allocate memory for firmware name\n");
558 dev_info(dev, "requesting fw '%s'\n", fw_name);
559 error = reject_firmware(&fw, fw_name, dev);
562 dev_err(dev, "failed to request firmware: %d\n", error);
566 /* Firmware file must match signature data */
567 fw_signature = &fw->data[data->fw_signature_address];
568 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
569 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
570 (int)sizeof(signature), signature,
571 (int)sizeof(signature), fw_signature);
576 error = mutex_lock_interruptible(&data->sysfs_mutex);
580 error = elan_update_firmware(data, fw);
582 mutex_unlock(&data->sysfs_mutex);
585 release_firmware(fw);
586 return error ?: count;
589 static ssize_t calibrate_store(struct device *dev,
590 struct device_attribute *attr,
591 const char *buf, size_t count)
593 struct i2c_client *client = to_i2c_client(dev);
594 struct elan_tp_data *data = i2c_get_clientdata(client);
598 u8 val[ETP_CALIBRATE_MAX_LEN];
600 retval = mutex_lock_interruptible(&data->sysfs_mutex);
604 disable_irq(client->irq);
606 data->mode |= ETP_ENABLE_CALIBRATE;
607 retval = data->ops->set_mode(client, data->mode);
609 dev_err(dev, "failed to enable calibration mode: %d\n",
614 retval = data->ops->calibrate(client);
616 dev_err(dev, "failed to start calibration: %d\n",
618 goto out_disable_calibrate;
623 /* Wait 250ms before checking if calibration has completed. */
626 retval = data->ops->calibrate_result(client, val);
628 dev_err(dev, "failed to check calibration result: %d\n",
630 else if (val[0] == 0)
631 break; /* calibration done */
636 dev_err(dev, "failed to calibrate. Timeout.\n");
640 out_disable_calibrate:
641 data->mode &= ~ETP_ENABLE_CALIBRATE;
642 error = data->ops->set_mode(data->client, data->mode);
644 dev_err(dev, "failed to disable calibration mode: %d\n",
650 enable_irq(client->irq);
651 mutex_unlock(&data->sysfs_mutex);
652 return retval ?: count;
655 static ssize_t elan_sysfs_read_mode(struct device *dev,
656 struct device_attribute *attr,
659 struct i2c_client *client = to_i2c_client(dev);
660 struct elan_tp_data *data = i2c_get_clientdata(client);
664 error = mutex_lock_interruptible(&data->sysfs_mutex);
668 error = data->ops->iap_get_mode(data->client, &mode);
670 mutex_unlock(&data->sysfs_mutex);
675 return sprintf(buf, "%d\n", (int)mode);
678 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
679 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
680 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
681 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
682 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
683 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
684 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
686 static DEVICE_ATTR_WO(calibrate);
688 static struct attribute *elan_sysfs_entries[] = {
689 &dev_attr_product_id.attr,
690 &dev_attr_firmware_version.attr,
691 &dev_attr_sample_version.attr,
692 &dev_attr_iap_version.attr,
693 &dev_attr_fw_checksum.attr,
694 &dev_attr_calibrate.attr,
696 &dev_attr_update_fw.attr,
700 static const struct attribute_group elan_sysfs_group = {
701 .attrs = elan_sysfs_entries,
704 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
705 const char *buf, size_t count)
707 struct i2c_client *client = to_i2c_client(dev);
708 struct elan_tp_data *data = i2c_get_clientdata(client);
712 retval = mutex_lock_interruptible(&data->sysfs_mutex);
716 disable_irq(client->irq);
718 data->baseline_ready = false;
720 data->mode |= ETP_ENABLE_CALIBRATE;
721 retval = data->ops->set_mode(data->client, data->mode);
723 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
730 retval = data->ops->get_baseline_data(data->client, true,
731 &data->max_baseline);
733 dev_err(dev, "Failed to read max baseline form device: %d\n",
735 goto out_disable_calibrate;
738 retval = data->ops->get_baseline_data(data->client, false,
739 &data->min_baseline);
741 dev_err(dev, "Failed to read min baseline form device: %d\n",
743 goto out_disable_calibrate;
746 data->baseline_ready = true;
748 out_disable_calibrate:
749 data->mode &= ~ETP_ENABLE_CALIBRATE;
750 error = data->ops->set_mode(data->client, data->mode);
752 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
758 enable_irq(client->irq);
759 mutex_unlock(&data->sysfs_mutex);
760 return retval ?: count;
763 static ssize_t min_show(struct device *dev,
764 struct device_attribute *attr, char *buf)
766 struct i2c_client *client = to_i2c_client(dev);
767 struct elan_tp_data *data = i2c_get_clientdata(client);
770 retval = mutex_lock_interruptible(&data->sysfs_mutex);
774 if (!data->baseline_ready) {
779 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
782 mutex_unlock(&data->sysfs_mutex);
786 static ssize_t max_show(struct device *dev,
787 struct device_attribute *attr, char *buf)
789 struct i2c_client *client = to_i2c_client(dev);
790 struct elan_tp_data *data = i2c_get_clientdata(client);
793 retval = mutex_lock_interruptible(&data->sysfs_mutex);
797 if (!data->baseline_ready) {
802 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
805 mutex_unlock(&data->sysfs_mutex);
810 static DEVICE_ATTR_WO(acquire);
811 static DEVICE_ATTR_RO(min);
812 static DEVICE_ATTR_RO(max);
814 static struct attribute *elan_baseline_sysfs_entries[] = {
815 &dev_attr_acquire.attr,
821 static const struct attribute_group elan_baseline_sysfs_group = {
823 .attrs = elan_baseline_sysfs_entries,
826 static const struct attribute_group *elan_sysfs_groups[] = {
828 &elan_baseline_sysfs_group,
833 ******************************************************************
835 ******************************************************************
837 static void elan_report_contact(struct elan_tp_data *data,
838 int contact_num, bool contact_valid,
841 struct input_dev *input = data->input;
842 unsigned int pos_x, pos_y;
843 unsigned int pressure, mk_x, mk_y;
844 unsigned int area_x, area_y, major, minor;
845 unsigned int scaled_pressure;
848 pos_x = ((finger_data[0] & 0xf0) << 4) |
850 pos_y = ((finger_data[0] & 0x0f) << 8) |
852 mk_x = (finger_data[3] & 0x0f);
853 mk_y = (finger_data[3] >> 4);
854 pressure = finger_data[4];
856 if (pos_x > data->max_x || pos_y > data->max_y) {
857 dev_dbg(input->dev.parent,
858 "[%d] x=%d y=%d over max (%d, %d)",
859 contact_num, pos_x, pos_y,
860 data->max_x, data->max_y);
865 * To avoid treating large finger as palm, let's reduce the
866 * width x and y per trace.
868 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
869 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
871 major = max(area_x, area_y);
872 minor = min(area_x, area_y);
874 scaled_pressure = pressure + data->pressure_adjustment;
876 if (scaled_pressure > ETP_MAX_PRESSURE)
877 scaled_pressure = ETP_MAX_PRESSURE;
879 input_mt_slot(input, contact_num);
880 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
881 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
882 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
883 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
884 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
885 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
886 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
888 input_mt_slot(input, contact_num);
889 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
893 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
895 struct input_dev *input = data->input;
896 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
898 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
899 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
900 bool contact_valid, hover_event;
902 hover_event = hover_info & 0x40;
903 for (i = 0; i < ETP_MAX_FINGERS; i++) {
904 contact_valid = tp_info & (1U << (3 + i));
905 elan_report_contact(data, i, contact_valid, finger_data);
908 finger_data += ETP_FINGER_DATA_LEN;
911 input_report_key(input, BTN_LEFT, tp_info & 0x01);
912 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
913 input_mt_report_pointer_emulation(input, true);
917 static irqreturn_t elan_isr(int irq, void *dev_id)
919 struct elan_tp_data *data = dev_id;
920 struct device *dev = &data->client->dev;
922 u8 report[ETP_MAX_REPORT_LEN];
925 * When device is connected to i2c bus, when all IAP page writes
926 * complete, the driver will receive interrupt and must read
927 * 0000 to confirm that IAP is finished.
929 if (data->in_fw_update) {
930 complete(&data->fw_completion);
934 error = data->ops->get_report(data->client, report);
938 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
939 dev_err(dev, "invalid report id data (%x)\n",
940 report[ETP_REPORT_ID_OFFSET]);
942 elan_report_absolute(data, report);
949 ******************************************************************
950 * Elan initialization functions
951 ******************************************************************
953 static int elan_setup_input_device(struct elan_tp_data *data)
955 struct device *dev = &data->client->dev;
956 struct input_dev *input;
957 unsigned int max_width = max(data->width_x, data->width_y);
958 unsigned int min_width = min(data->width_x, data->width_y);
961 input = devm_input_allocate_device(dev);
965 input->name = "Elan Touchpad";
966 input->id.bustype = BUS_I2C;
967 input->id.vendor = ELAN_VENDOR_ID;
968 input->id.product = data->product_id;
969 input_set_drvdata(input, data);
971 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
972 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
974 dev_err(dev, "failed to initialize MT slots: %d\n", error);
978 __set_bit(EV_ABS, input->evbit);
979 __set_bit(INPUT_PROP_POINTER, input->propbit);
980 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
981 __set_bit(BTN_LEFT, input->keybit);
983 /* Set up ST parameters */
984 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
985 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
986 input_abs_set_res(input, ABS_X, data->x_res);
987 input_abs_set_res(input, ABS_Y, data->y_res);
988 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
989 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
990 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
992 /* And MT parameters */
993 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
994 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
995 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
996 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
997 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
998 ETP_MAX_PRESSURE, 0, 0);
999 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
1000 ETP_FINGER_WIDTH * max_width, 0, 0);
1001 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
1002 ETP_FINGER_WIDTH * min_width, 0, 0);
1004 data->input = input;
1009 static void elan_disable_regulator(void *_data)
1011 struct elan_tp_data *data = _data;
1013 regulator_disable(data->vcc);
1016 static void elan_remove_sysfs_groups(void *_data)
1018 struct elan_tp_data *data = _data;
1020 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
1023 static int elan_probe(struct i2c_client *client,
1024 const struct i2c_device_id *dev_id)
1026 const struct elan_transport_ops *transport_ops;
1027 struct device *dev = &client->dev;
1028 struct elan_tp_data *data;
1029 unsigned long irqflags;
1032 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1033 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1034 transport_ops = &elan_i2c_ops;
1035 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1036 i2c_check_functionality(client->adapter,
1037 I2C_FUNC_SMBUS_BYTE_DATA |
1038 I2C_FUNC_SMBUS_BLOCK_DATA |
1039 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1040 transport_ops = &elan_smbus_ops;
1042 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1046 data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data),
1051 i2c_set_clientdata(client, data);
1053 data->ops = transport_ops;
1054 data->client = client;
1055 init_completion(&data->fw_completion);
1056 mutex_init(&data->sysfs_mutex);
1058 data->vcc = devm_regulator_get(&client->dev, "vcc");
1059 if (IS_ERR(data->vcc)) {
1060 error = PTR_ERR(data->vcc);
1061 if (error != -EPROBE_DEFER)
1062 dev_err(&client->dev,
1063 "Failed to get 'vcc' regulator: %d\n",
1068 error = regulator_enable(data->vcc);
1070 dev_err(&client->dev,
1071 "Failed to enable regulator: %d\n", error);
1075 error = devm_add_action(&client->dev,
1076 elan_disable_regulator, data);
1078 regulator_disable(data->vcc);
1079 dev_err(&client->dev,
1080 "Failed to add disable regulator action: %d\n",
1085 /* Make sure there is something at this address */
1086 error = i2c_smbus_read_byte(client);
1088 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1092 /* Initialize the touchpad. */
1093 error = elan_initialize(data);
1097 error = elan_query_device_info(data);
1101 error = elan_query_device_parameters(data);
1105 dev_dbg(&client->dev,
1106 "Elan Touchpad Information:\n"
1107 " Module product ID: 0x%04x\n"
1108 " Firmware Version: 0x%04x\n"
1109 " Sample Version: 0x%04x\n"
1110 " IAP Version: 0x%04x\n"
1111 " Max ABS X,Y: %d,%d\n"
1112 " Width X,Y: %d,%d\n"
1113 " Resolution X,Y: %d,%d (dots/mm)\n",
1118 data->max_x, data->max_y,
1119 data->width_x, data->width_y,
1120 data->x_res, data->y_res);
1122 /* Set up input device properties based on queried parameters. */
1123 error = elan_setup_input_device(data);
1128 * Systems using device tree should set up interrupt via DTS,
1129 * the rest will use the default falling edge interrupts.
1131 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1133 error = devm_request_threaded_irq(&client->dev, client->irq,
1135 irqflags | IRQF_ONESHOT,
1136 client->name, data);
1138 dev_err(&client->dev, "cannot register irq=%d\n", client->irq);
1142 error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups);
1144 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1149 error = devm_add_action(&client->dev,
1150 elan_remove_sysfs_groups, data);
1152 elan_remove_sysfs_groups(data);
1153 dev_err(&client->dev,
1154 "Failed to add sysfs cleanup action: %d\n",
1159 error = input_register_device(data->input);
1161 dev_err(&client->dev, "failed to register input device: %d\n",
1167 * Systems using device tree should set up wakeup via DTS,
1168 * the rest will configure device as wakeup source by default.
1170 if (!client->dev.of_node)
1171 device_init_wakeup(&client->dev, true);
1176 static int __maybe_unused elan_suspend(struct device *dev)
1178 struct i2c_client *client = to_i2c_client(dev);
1179 struct elan_tp_data *data = i2c_get_clientdata(client);
1183 * We are taking the mutex to make sure sysfs operations are
1184 * complete before we attempt to bring the device into low[er]
1187 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1191 disable_irq(client->irq);
1193 if (device_may_wakeup(dev)) {
1194 ret = elan_sleep(data);
1195 /* Enable wake from IRQ */
1196 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1198 ret = elan_disable_power(data);
1201 mutex_unlock(&data->sysfs_mutex);
1205 static int __maybe_unused elan_resume(struct device *dev)
1207 struct i2c_client *client = to_i2c_client(dev);
1208 struct elan_tp_data *data = i2c_get_clientdata(client);
1211 if (device_may_wakeup(dev) && data->irq_wake) {
1212 disable_irq_wake(client->irq);
1213 data->irq_wake = false;
1216 error = elan_enable_power(data);
1218 dev_err(dev, "power up when resuming failed: %d\n", error);
1222 error = elan_initialize(data);
1224 dev_err(dev, "initialize when resuming failed: %d\n", error);
1227 enable_irq(data->client->irq);
1231 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1233 static const struct i2c_device_id elan_id[] = {
1237 MODULE_DEVICE_TABLE(i2c, elan_id);
1240 static const struct acpi_device_id elan_acpi_id[] = {
1265 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1269 static const struct of_device_id elan_of_match[] = {
1270 { .compatible = "elan,ekth3000" },
1273 MODULE_DEVICE_TABLE(of, elan_of_match);
1276 static struct i2c_driver elan_driver = {
1278 .name = DRIVER_NAME,
1280 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1281 .of_match_table = of_match_ptr(elan_of_match),
1282 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1284 .probe = elan_probe,
1285 .id_table = elan_id,
1288 module_i2c_driver(elan_driver);
1290 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1291 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1292 MODULE_LICENSE("GPL");
1293 MODULE_VERSION(ELAN_DRIVER_VERSION);