2 * Elan I2C/SMBus Touchpad driver
4 * Copyright (c) 2013 ELAN Microelectronics Corp.
6 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
9 * Based on cyapa driver:
10 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
11 * copyright (c) 2011-2012 Google, Inc.
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.
17 * Trademarks are the property of their respective owners.
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>
37 #include <linux/regulator/consumer.h>
38 #include <asm/unaligned.h>
42 #define DRIVER_NAME "elan_i2c"
43 #define ELAN_DRIVER_VERSION "1.5.8"
44 #define ETP_MAX_PRESSURE 255
45 #define ETP_FWIDTH_REDUCE 90
46 #define ETP_FINGER_WIDTH 15
47 #define ETP_RETRY_COUNT 3
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
58 /* The main device structure */
60 struct i2c_client *client;
61 struct input_dev *input;
62 struct regulator *vcc;
64 const struct elan_transport_ops *ops;
67 struct completion fw_completion;
70 struct mutex sysfs_mutex;
84 int pressure_adjustment;
87 u16 fw_vaildpage_count;
88 u16 fw_signature_address;
97 static int elan_get_fwinfo(u8 ic_type, u16 *vaildpage_count,
98 u16 *signature_address)
102 *vaildpage_count = 768;
105 *vaildpage_count = 896;
108 /* unknown ic type clear value */
109 *vaildpage_count = 0;
110 *signature_address = 0;
115 (*vaildpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
120 static int elan_enable_power(struct elan_tp_data *data)
122 int repeat = ETP_RETRY_COUNT;
125 error = regulator_enable(data->vcc);
127 dev_err(&data->client->dev,
128 "failed to enable regulator: %d\n", error);
133 error = data->ops->power_control(data->client, true);
138 } while (--repeat > 0);
140 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
144 static int elan_disable_power(struct elan_tp_data *data)
146 int repeat = ETP_RETRY_COUNT;
150 error = data->ops->power_control(data->client, false);
152 error = regulator_disable(data->vcc);
154 dev_err(&data->client->dev,
155 "failed to disable regulator: %d\n",
157 /* Attempt to power the chip back up */
158 data->ops->power_control(data->client, true);
166 } while (--repeat > 0);
168 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
172 static int elan_sleep(struct elan_tp_data *data)
174 int repeat = ETP_RETRY_COUNT;
178 error = data->ops->sleep_control(data->client, true);
183 } while (--repeat > 0);
188 static int __elan_initialize(struct elan_tp_data *data)
190 struct i2c_client *client = data->client;
193 error = data->ops->initialize(client);
195 dev_err(&client->dev, "device initialize failed: %d\n", error);
199 data->mode |= ETP_ENABLE_ABS;
200 error = data->ops->set_mode(client, data->mode);
202 dev_err(&client->dev,
203 "failed to switch to absolute mode: %d\n", error);
207 error = data->ops->sleep_control(client, false);
209 dev_err(&client->dev,
210 "failed to wake device up: %d\n", error);
217 static int elan_initialize(struct elan_tp_data *data)
219 int repeat = ETP_RETRY_COUNT;
223 error = __elan_initialize(data);
228 } while (--repeat > 0);
233 static int elan_query_device_info(struct elan_tp_data *data)
237 error = data->ops->get_product_id(data->client, &data->product_id);
241 error = data->ops->get_version(data->client, false, &data->fw_version);
245 error = data->ops->get_checksum(data->client, false,
250 error = data->ops->get_sm_version(data->client, &data->ic_type,
255 error = data->ops->get_version(data->client, true, &data->iap_version);
259 error = data->ops->get_pressure_adjustment(data->client,
260 &data->pressure_adjustment);
264 error = elan_get_fwinfo(data->ic_type, &data->fw_vaildpage_count,
265 &data->fw_signature_address);
267 dev_err(&data->client->dev,
268 "unknown ic type %d\n", data->ic_type);
275 static unsigned int elan_convert_resolution(u8 val)
278 * (value from firmware) * 10 + 790 = dpi
280 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
284 return ((int)(char)val * 10 + 790) * 10 / 254;
287 static int elan_query_device_parameters(struct elan_tp_data *data)
289 unsigned int x_traces, y_traces;
290 u8 hw_x_res, hw_y_res;
293 error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
297 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
301 data->width_x = data->max_x / x_traces;
302 data->width_y = data->max_y / y_traces;
304 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
308 data->x_res = elan_convert_resolution(hw_x_res);
309 data->y_res = elan_convert_resolution(hw_y_res);
315 **********************************************************
316 * IAP firmware updater related routines
317 **********************************************************
319 static int elan_write_fw_block(struct elan_tp_data *data,
320 const u8 *page, u16 checksum, int idx)
322 int retry = ETP_RETRY_COUNT;
326 error = data->ops->write_fw_block(data->client,
327 page, checksum, idx);
331 dev_dbg(&data->client->dev,
332 "IAP retrying page %d (error: %d)\n", idx, error);
333 } while (--retry > 0);
338 static int __elan_update_firmware(struct elan_tp_data *data,
339 const struct firmware *fw)
341 struct i2c_client *client = data->client;
342 struct device *dev = &client->dev;
347 u16 sw_checksum = 0, fw_checksum = 0;
349 error = data->ops->prepare_fw_update(client);
353 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
355 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
356 for (i = boot_page_count; i < data->fw_vaildpage_count; i++) {
358 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
360 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
361 checksum += ((page[j + 1] << 8) | page[j]);
363 error = elan_write_fw_block(data, page, checksum, i);
365 dev_err(dev, "write page %d fail: %d\n", i, error);
369 sw_checksum += checksum;
372 /* Wait WDT reset and power on reset */
375 error = data->ops->finish_fw_update(client, &data->fw_completion);
379 error = data->ops->get_checksum(client, true, &fw_checksum);
383 if (sw_checksum != fw_checksum) {
384 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
385 sw_checksum, fw_checksum);
392 static int elan_update_firmware(struct elan_tp_data *data,
393 const struct firmware *fw)
395 struct i2c_client *client = data->client;
398 dev_dbg(&client->dev, "Starting firmware update....\n");
400 disable_irq(client->irq);
401 data->in_fw_update = true;
403 retval = __elan_update_firmware(data, fw);
405 dev_err(&client->dev, "firmware update failed: %d\n", retval);
406 data->ops->iap_reset(client);
408 /* Reinitialize TP after fw is updated */
409 elan_initialize(data);
410 elan_query_device_info(data);
413 data->in_fw_update = false;
414 enable_irq(client->irq);
420 *******************************************************************
422 *******************************************************************
424 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
425 struct device_attribute *attr,
428 struct i2c_client *client = to_i2c_client(dev);
429 struct elan_tp_data *data = i2c_get_clientdata(client);
431 return sprintf(buf, "0x%04x\n", data->fw_checksum);
434 static ssize_t elan_sysfs_read_product_id(struct device *dev,
435 struct device_attribute *attr,
438 struct i2c_client *client = to_i2c_client(dev);
439 struct elan_tp_data *data = i2c_get_clientdata(client);
441 return sprintf(buf, "%d.0\n", data->product_id);
444 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
445 struct device_attribute *attr,
448 struct i2c_client *client = to_i2c_client(dev);
449 struct elan_tp_data *data = i2c_get_clientdata(client);
451 return sprintf(buf, "%d.0\n", data->fw_version);
454 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
455 struct device_attribute *attr,
458 struct i2c_client *client = to_i2c_client(dev);
459 struct elan_tp_data *data = i2c_get_clientdata(client);
461 return sprintf(buf, "%d.0\n", data->sm_version);
464 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
465 struct device_attribute *attr,
468 struct i2c_client *client = to_i2c_client(dev);
469 struct elan_tp_data *data = i2c_get_clientdata(client);
471 return sprintf(buf, "%d.0\n", data->iap_version);
474 static ssize_t elan_sysfs_update_fw(struct device *dev,
475 struct device_attribute *attr,
476 const char *buf, size_t count)
478 struct elan_tp_data *data = dev_get_drvdata(dev);
479 const struct firmware *fw;
481 const u8 *fw_signature;
482 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
484 error = request_firmware(&fw, ETP_FW_NAME, dev);
486 dev_err(dev, "cannot load firmware %s: %d\n",
491 /* Firmware file must match signature data */
492 fw_signature = &fw->data[data->fw_signature_address];
493 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
494 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
495 (int)sizeof(signature), signature,
496 (int)sizeof(signature), fw_signature);
501 error = mutex_lock_interruptible(&data->sysfs_mutex);
505 error = elan_update_firmware(data, fw);
507 mutex_unlock(&data->sysfs_mutex);
510 release_firmware(fw);
511 return error ?: count;
514 static ssize_t calibrate_store(struct device *dev,
515 struct device_attribute *attr,
516 const char *buf, size_t count)
518 struct i2c_client *client = to_i2c_client(dev);
519 struct elan_tp_data *data = i2c_get_clientdata(client);
525 retval = mutex_lock_interruptible(&data->sysfs_mutex);
529 disable_irq(client->irq);
531 data->mode |= ETP_ENABLE_CALIBRATE;
532 retval = data->ops->set_mode(client, data->mode);
534 dev_err(dev, "failed to enable calibration mode: %d\n",
539 retval = data->ops->calibrate(client);
541 dev_err(dev, "failed to start calibration: %d\n",
543 goto out_disable_calibrate;
548 /* Wait 250ms before checking if calibration has completed. */
551 retval = data->ops->calibrate_result(client, val);
553 dev_err(dev, "failed to check calibration result: %d\n",
555 else if (val[0] == 0)
556 break; /* calibration done */
561 dev_err(dev, "failed to calibrate. Timeout.\n");
565 out_disable_calibrate:
566 data->mode &= ~ETP_ENABLE_CALIBRATE;
567 error = data->ops->set_mode(data->client, data->mode);
569 dev_err(dev, "failed to disable calibration mode: %d\n",
575 enable_irq(client->irq);
576 mutex_unlock(&data->sysfs_mutex);
577 return retval ?: count;
580 static ssize_t elan_sysfs_read_mode(struct device *dev,
581 struct device_attribute *attr,
584 struct i2c_client *client = to_i2c_client(dev);
585 struct elan_tp_data *data = i2c_get_clientdata(client);
589 error = mutex_lock_interruptible(&data->sysfs_mutex);
593 error = data->ops->iap_get_mode(data->client, &mode);
595 mutex_unlock(&data->sysfs_mutex);
600 return sprintf(buf, "%d\n", (int)mode);
603 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
604 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
605 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
606 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
607 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
608 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
609 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
611 static DEVICE_ATTR_WO(calibrate);
613 static struct attribute *elan_sysfs_entries[] = {
614 &dev_attr_product_id.attr,
615 &dev_attr_firmware_version.attr,
616 &dev_attr_sample_version.attr,
617 &dev_attr_iap_version.attr,
618 &dev_attr_fw_checksum.attr,
619 &dev_attr_calibrate.attr,
621 &dev_attr_update_fw.attr,
625 static const struct attribute_group elan_sysfs_group = {
626 .attrs = elan_sysfs_entries,
629 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
630 const char *buf, size_t count)
632 struct i2c_client *client = to_i2c_client(dev);
633 struct elan_tp_data *data = i2c_get_clientdata(client);
637 retval = mutex_lock_interruptible(&data->sysfs_mutex);
641 disable_irq(client->irq);
643 data->baseline_ready = false;
645 data->mode |= ETP_ENABLE_CALIBRATE;
646 retval = data->ops->set_mode(data->client, data->mode);
648 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
655 retval = data->ops->get_baseline_data(data->client, true,
656 &data->max_baseline);
658 dev_err(dev, "Failed to read max baseline form device: %d\n",
660 goto out_disable_calibrate;
663 retval = data->ops->get_baseline_data(data->client, false,
664 &data->min_baseline);
666 dev_err(dev, "Failed to read min baseline form device: %d\n",
668 goto out_disable_calibrate;
671 data->baseline_ready = true;
673 out_disable_calibrate:
674 data->mode &= ~ETP_ENABLE_CALIBRATE;
675 error = data->ops->set_mode(data->client, data->mode);
677 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
683 enable_irq(client->irq);
684 mutex_unlock(&data->sysfs_mutex);
685 return retval ?: count;
688 static ssize_t min_show(struct device *dev,
689 struct device_attribute *attr, char *buf)
691 struct i2c_client *client = to_i2c_client(dev);
692 struct elan_tp_data *data = i2c_get_clientdata(client);
695 retval = mutex_lock_interruptible(&data->sysfs_mutex);
699 if (!data->baseline_ready) {
704 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
707 mutex_unlock(&data->sysfs_mutex);
711 static ssize_t max_show(struct device *dev,
712 struct device_attribute *attr, char *buf)
714 struct i2c_client *client = to_i2c_client(dev);
715 struct elan_tp_data *data = i2c_get_clientdata(client);
718 retval = mutex_lock_interruptible(&data->sysfs_mutex);
722 if (!data->baseline_ready) {
727 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
730 mutex_unlock(&data->sysfs_mutex);
735 static DEVICE_ATTR_WO(acquire);
736 static DEVICE_ATTR_RO(min);
737 static DEVICE_ATTR_RO(max);
739 static struct attribute *elan_baseline_sysfs_entries[] = {
740 &dev_attr_acquire.attr,
746 static const struct attribute_group elan_baseline_sysfs_group = {
748 .attrs = elan_baseline_sysfs_entries,
751 static const struct attribute_group *elan_sysfs_groups[] = {
753 &elan_baseline_sysfs_group,
758 ******************************************************************
760 ******************************************************************
762 static void elan_report_contact(struct elan_tp_data *data,
763 int contact_num, bool contact_valid,
764 bool hover_event, u8 *finger_data)
766 struct input_dev *input = data->input;
767 unsigned int pos_x, pos_y;
768 unsigned int pressure, mk_x, mk_y;
769 unsigned int area_x, area_y, major, minor;
770 unsigned int scaled_pressure;
773 pos_x = ((finger_data[0] & 0xf0) << 4) |
775 pos_y = ((finger_data[0] & 0x0f) << 8) |
777 mk_x = (finger_data[3] & 0x0f);
778 mk_y = (finger_data[3] >> 4);
779 pressure = finger_data[4];
781 if (pos_x > data->max_x || pos_y > data->max_y) {
782 dev_dbg(input->dev.parent,
783 "[%d] x=%d y=%d over max (%d, %d)",
784 contact_num, pos_x, pos_y,
785 data->max_x, data->max_y);
790 * To avoid treating large finger as palm, let's reduce the
791 * width x and y per trace.
793 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
794 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
796 major = max(area_x, area_y);
797 minor = min(area_x, area_y);
799 scaled_pressure = pressure + data->pressure_adjustment;
801 if (scaled_pressure > ETP_MAX_PRESSURE)
802 scaled_pressure = ETP_MAX_PRESSURE;
804 input_mt_slot(input, contact_num);
805 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
806 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
807 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
808 input_report_abs(input, ABS_MT_DISTANCE, hover_event);
809 input_report_abs(input, ABS_MT_PRESSURE,
810 hover_event ? 0 : scaled_pressure);
811 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
812 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
813 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
815 input_mt_slot(input, contact_num);
816 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
820 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
822 struct input_dev *input = data->input;
823 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
825 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
826 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
827 bool contact_valid, hover_event;
829 hover_event = hover_info & 0x40;
830 for (i = 0; i < ETP_MAX_FINGERS; i++) {
831 contact_valid = tp_info & (1U << (3 + i));
832 elan_report_contact(data, i, contact_valid, hover_event,
836 finger_data += ETP_FINGER_DATA_LEN;
839 input_report_key(input, BTN_LEFT, tp_info & 0x01);
840 input_mt_report_pointer_emulation(input, true);
844 static irqreturn_t elan_isr(int irq, void *dev_id)
846 struct elan_tp_data *data = dev_id;
847 struct device *dev = &data->client->dev;
849 u8 report[ETP_MAX_REPORT_LEN];
852 * When device is connected to i2c bus, when all IAP page writes
853 * complete, the driver will receive interrupt and must read
854 * 0000 to confirm that IAP is finished.
856 if (data->in_fw_update) {
857 complete(&data->fw_completion);
861 error = data->ops->get_report(data->client, report);
865 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
866 dev_err(dev, "invalid report id data (%x)\n",
867 report[ETP_REPORT_ID_OFFSET]);
869 elan_report_absolute(data, report);
876 ******************************************************************
877 * Elan initialization functions
878 ******************************************************************
880 static int elan_setup_input_device(struct elan_tp_data *data)
882 struct device *dev = &data->client->dev;
883 struct input_dev *input;
884 unsigned int max_width = max(data->width_x, data->width_y);
885 unsigned int min_width = min(data->width_x, data->width_y);
888 input = devm_input_allocate_device(dev);
892 input->name = "Elan Touchpad";
893 input->id.bustype = BUS_I2C;
894 input_set_drvdata(input, data);
896 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
897 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
899 dev_err(dev, "failed to initialize MT slots: %d\n", error);
903 __set_bit(EV_ABS, input->evbit);
904 __set_bit(INPUT_PROP_POINTER, input->propbit);
905 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
906 __set_bit(BTN_LEFT, input->keybit);
908 /* Set up ST parameters */
909 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
910 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
911 input_abs_set_res(input, ABS_X, data->x_res);
912 input_abs_set_res(input, ABS_Y, data->y_res);
913 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
914 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
916 /* And MT parameters */
917 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
918 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
919 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
920 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
921 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
922 ETP_MAX_PRESSURE, 0, 0);
923 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
924 ETP_FINGER_WIDTH * max_width, 0, 0);
925 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
926 ETP_FINGER_WIDTH * min_width, 0, 0);
927 input_set_abs_params(input, ABS_MT_DISTANCE, 0, 1, 0, 0);
934 static void elan_disable_regulator(void *_data)
936 struct elan_tp_data *data = _data;
938 regulator_disable(data->vcc);
941 static void elan_remove_sysfs_groups(void *_data)
943 struct elan_tp_data *data = _data;
945 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
948 static int elan_probe(struct i2c_client *client,
949 const struct i2c_device_id *dev_id)
951 const struct elan_transport_ops *transport_ops;
952 struct device *dev = &client->dev;
953 struct elan_tp_data *data;
954 unsigned long irqflags;
957 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
958 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
959 transport_ops = &elan_i2c_ops;
960 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
961 i2c_check_functionality(client->adapter,
962 I2C_FUNC_SMBUS_BYTE_DATA |
963 I2C_FUNC_SMBUS_BLOCK_DATA |
964 I2C_FUNC_SMBUS_I2C_BLOCK)) {
965 transport_ops = &elan_smbus_ops;
967 dev_err(dev, "not a supported I2C/SMBus adapter\n");
971 data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data),
976 i2c_set_clientdata(client, data);
978 data->ops = transport_ops;
979 data->client = client;
980 init_completion(&data->fw_completion);
981 mutex_init(&data->sysfs_mutex);
983 data->vcc = devm_regulator_get(&client->dev, "vcc");
984 if (IS_ERR(data->vcc)) {
985 error = PTR_ERR(data->vcc);
986 if (error != -EPROBE_DEFER)
987 dev_err(&client->dev,
988 "Failed to get 'vcc' regulator: %d\n",
993 error = regulator_enable(data->vcc);
995 dev_err(&client->dev,
996 "Failed to enable regulator: %d\n", error);
1000 error = devm_add_action(&client->dev,
1001 elan_disable_regulator, data);
1003 regulator_disable(data->vcc);
1004 dev_err(&client->dev,
1005 "Failed to add disable regulator action: %d\n",
1010 /* Initialize the touchpad. */
1011 error = elan_initialize(data);
1015 error = elan_query_device_info(data);
1019 error = elan_query_device_parameters(data);
1023 dev_dbg(&client->dev,
1024 "Elan Touchpad Information:\n"
1025 " Module product ID: 0x%04x\n"
1026 " Firmware Version: 0x%04x\n"
1027 " Sample Version: 0x%04x\n"
1028 " IAP Version: 0x%04x\n"
1029 " Max ABS X,Y: %d,%d\n"
1030 " Width X,Y: %d,%d\n"
1031 " Resolution X,Y: %d,%d (dots/mm)\n",
1036 data->max_x, data->max_y,
1037 data->width_x, data->width_y,
1038 data->x_res, data->y_res);
1040 /* Set up input device properties based on queried parameters. */
1041 error = elan_setup_input_device(data);
1046 * Systems using device tree should set up interrupt via DTS,
1047 * the rest will use the default falling edge interrupts.
1049 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1051 error = devm_request_threaded_irq(&client->dev, client->irq,
1053 irqflags | IRQF_ONESHOT,
1054 client->name, data);
1056 dev_err(&client->dev, "cannot register irq=%d\n", client->irq);
1060 error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups);
1062 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1067 error = devm_add_action(&client->dev,
1068 elan_remove_sysfs_groups, data);
1070 elan_remove_sysfs_groups(data);
1071 dev_err(&client->dev,
1072 "Failed to add sysfs cleanup action: %d\n",
1077 error = input_register_device(data->input);
1079 dev_err(&client->dev, "failed to register input device: %d\n",
1085 * Systems using device tree should set up wakeup via DTS,
1086 * the rest will configure device as wakeup source by default.
1088 if (!client->dev.of_node)
1089 device_init_wakeup(&client->dev, true);
1094 static int __maybe_unused elan_suspend(struct device *dev)
1096 struct i2c_client *client = to_i2c_client(dev);
1097 struct elan_tp_data *data = i2c_get_clientdata(client);
1101 * We are taking the mutex to make sure sysfs operations are
1102 * complete before we attempt to bring the device into low[er]
1105 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1109 disable_irq(client->irq);
1111 if (device_may_wakeup(dev)) {
1112 ret = elan_sleep(data);
1113 /* Enable wake from IRQ */
1114 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1116 ret = elan_disable_power(data);
1119 mutex_unlock(&data->sysfs_mutex);
1123 static int __maybe_unused elan_resume(struct device *dev)
1125 struct i2c_client *client = to_i2c_client(dev);
1126 struct elan_tp_data *data = i2c_get_clientdata(client);
1129 if (device_may_wakeup(dev) && data->irq_wake) {
1130 disable_irq_wake(client->irq);
1131 data->irq_wake = false;
1134 error = elan_enable_power(data);
1136 dev_err(dev, "power up when resuming failed: %d\n", error);
1140 error = elan_initialize(data);
1142 dev_err(dev, "initialize when resuming failed: %d\n", error);
1145 enable_irq(data->client->irq);
1149 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1151 static const struct i2c_device_id elan_id[] = {
1155 MODULE_DEVICE_TABLE(i2c, elan_id);
1158 static const struct acpi_device_id elan_acpi_id[] = {
1162 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1166 static const struct of_device_id elan_of_match[] = {
1167 { .compatible = "elan,ekth3000" },
1170 MODULE_DEVICE_TABLE(of, elan_of_match);
1173 static struct i2c_driver elan_driver = {
1175 .name = DRIVER_NAME,
1176 .owner = THIS_MODULE,
1178 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1179 .of_match_table = of_match_ptr(elan_of_match),
1181 .probe = elan_probe,
1182 .id_table = elan_id,
1185 module_i2c_driver(elan_driver);
1187 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1188 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1189 MODULE_LICENSE("GPL");
1190 MODULE_VERSION(ELAN_DRIVER_VERSION);