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 "1.6.0"
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_validpage_count;
88 u16 fw_signature_address;
97 static int elan_get_fwinfo(u8 iap_version, u16 *validpage_count,
98 u16 *signature_address)
100 switch (iap_version) {
102 *validpage_count = 512;
105 *validpage_count = 768;
108 *validpage_count = 896;
111 /* unknown ic type clear value */
112 *validpage_count = 0;
113 *signature_address = 0;
118 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
123 static int elan_enable_power(struct elan_tp_data *data)
125 int repeat = ETP_RETRY_COUNT;
128 error = regulator_enable(data->vcc);
130 dev_err(&data->client->dev,
131 "failed to enable regulator: %d\n", error);
136 error = data->ops->power_control(data->client, true);
141 } while (--repeat > 0);
143 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
147 static int elan_disable_power(struct elan_tp_data *data)
149 int repeat = ETP_RETRY_COUNT;
153 error = data->ops->power_control(data->client, false);
155 error = regulator_disable(data->vcc);
157 dev_err(&data->client->dev,
158 "failed to disable regulator: %d\n",
160 /* Attempt to power the chip back up */
161 data->ops->power_control(data->client, true);
169 } while (--repeat > 0);
171 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
175 static int elan_sleep(struct elan_tp_data *data)
177 int repeat = ETP_RETRY_COUNT;
181 error = data->ops->sleep_control(data->client, true);
186 } while (--repeat > 0);
191 static int __elan_initialize(struct elan_tp_data *data)
193 struct i2c_client *client = data->client;
196 error = data->ops->initialize(client);
198 dev_err(&client->dev, "device initialize failed: %d\n", error);
202 data->mode |= ETP_ENABLE_ABS;
203 error = data->ops->set_mode(client, data->mode);
205 dev_err(&client->dev,
206 "failed to switch to absolute mode: %d\n", error);
210 error = data->ops->sleep_control(client, false);
212 dev_err(&client->dev,
213 "failed to wake device up: %d\n", error);
220 static int elan_initialize(struct elan_tp_data *data)
222 int repeat = ETP_RETRY_COUNT;
226 error = __elan_initialize(data);
231 } while (--repeat > 0);
236 static int elan_query_device_info(struct elan_tp_data *data)
240 error = data->ops->get_product_id(data->client, &data->product_id);
244 error = data->ops->get_version(data->client, false, &data->fw_version);
248 error = data->ops->get_checksum(data->client, false,
253 error = data->ops->get_sm_version(data->client, &data->ic_type,
258 error = data->ops->get_version(data->client, true, &data->iap_version);
262 error = data->ops->get_pressure_adjustment(data->client,
263 &data->pressure_adjustment);
267 error = elan_get_fwinfo(data->iap_version, &data->fw_validpage_count,
268 &data->fw_signature_address);
270 dev_err(&data->client->dev,
271 "unknown iap version %d\n", data->iap_version);
278 static unsigned int elan_convert_resolution(u8 val)
281 * (value from firmware) * 10 + 790 = dpi
283 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
287 return ((int)(char)val * 10 + 790) * 10 / 254;
290 static int elan_query_device_parameters(struct elan_tp_data *data)
292 unsigned int x_traces, y_traces;
293 u8 hw_x_res, hw_y_res;
296 error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
300 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
304 data->width_x = data->max_x / x_traces;
305 data->width_y = data->max_y / y_traces;
307 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
311 data->x_res = elan_convert_resolution(hw_x_res);
312 data->y_res = elan_convert_resolution(hw_y_res);
318 **********************************************************
319 * IAP firmware updater related routines
320 **********************************************************
322 static int elan_write_fw_block(struct elan_tp_data *data,
323 const u8 *page, u16 checksum, int idx)
325 int retry = ETP_RETRY_COUNT;
329 error = data->ops->write_fw_block(data->client,
330 page, checksum, idx);
334 dev_dbg(&data->client->dev,
335 "IAP retrying page %d (error: %d)\n", idx, error);
336 } while (--retry > 0);
341 static int __elan_update_firmware(struct elan_tp_data *data,
342 const struct firmware *fw)
344 struct i2c_client *client = data->client;
345 struct device *dev = &client->dev;
350 u16 sw_checksum = 0, fw_checksum = 0;
352 error = data->ops->prepare_fw_update(client);
356 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
358 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
359 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
361 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
363 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
364 checksum += ((page[j + 1] << 8) | page[j]);
366 error = elan_write_fw_block(data, page, checksum, i);
368 dev_err(dev, "write page %d fail: %d\n", i, error);
372 sw_checksum += checksum;
375 /* Wait WDT reset and power on reset */
378 error = data->ops->finish_fw_update(client, &data->fw_completion);
382 error = data->ops->get_checksum(client, true, &fw_checksum);
386 if (sw_checksum != fw_checksum) {
387 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
388 sw_checksum, fw_checksum);
395 static int elan_update_firmware(struct elan_tp_data *data,
396 const struct firmware *fw)
398 struct i2c_client *client = data->client;
401 dev_dbg(&client->dev, "Starting firmware update....\n");
403 disable_irq(client->irq);
404 data->in_fw_update = true;
406 retval = __elan_update_firmware(data, fw);
408 dev_err(&client->dev, "firmware update failed: %d\n", retval);
409 data->ops->iap_reset(client);
411 /* Reinitialize TP after fw is updated */
412 elan_initialize(data);
413 elan_query_device_info(data);
416 data->in_fw_update = false;
417 enable_irq(client->irq);
423 *******************************************************************
425 *******************************************************************
427 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
428 struct device_attribute *attr,
431 struct i2c_client *client = to_i2c_client(dev);
432 struct elan_tp_data *data = i2c_get_clientdata(client);
434 return sprintf(buf, "0x%04x\n", data->fw_checksum);
437 static ssize_t elan_sysfs_read_product_id(struct device *dev,
438 struct device_attribute *attr,
441 struct i2c_client *client = to_i2c_client(dev);
442 struct elan_tp_data *data = i2c_get_clientdata(client);
444 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
448 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
449 struct device_attribute *attr,
452 struct i2c_client *client = to_i2c_client(dev);
453 struct elan_tp_data *data = i2c_get_clientdata(client);
455 return sprintf(buf, "%d.0\n", data->fw_version);
458 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
459 struct device_attribute *attr,
462 struct i2c_client *client = to_i2c_client(dev);
463 struct elan_tp_data *data = i2c_get_clientdata(client);
465 return sprintf(buf, "%d.0\n", data->sm_version);
468 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
469 struct device_attribute *attr,
472 struct i2c_client *client = to_i2c_client(dev);
473 struct elan_tp_data *data = i2c_get_clientdata(client);
475 return sprintf(buf, "%d.0\n", data->iap_version);
478 static ssize_t elan_sysfs_update_fw(struct device *dev,
479 struct device_attribute *attr,
480 const char *buf, size_t count)
482 struct elan_tp_data *data = dev_get_drvdata(dev);
483 const struct firmware *fw;
486 const u8 *fw_signature;
487 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
489 /* Look for a firmware with the product id appended. */
490 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
492 dev_err(dev, "failed to allocate memory for firmware name\n");
496 dev_info(dev, "requesting fw '%s'\n", fw_name);
497 error = request_firmware(&fw, fw_name, dev);
500 dev_err(dev, "failed to request firmware: %d\n", error);
504 /* Firmware file must match signature data */
505 fw_signature = &fw->data[data->fw_signature_address];
506 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
507 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
508 (int)sizeof(signature), signature,
509 (int)sizeof(signature), fw_signature);
514 error = mutex_lock_interruptible(&data->sysfs_mutex);
518 error = elan_update_firmware(data, fw);
520 mutex_unlock(&data->sysfs_mutex);
523 release_firmware(fw);
524 return error ?: count;
527 static ssize_t calibrate_store(struct device *dev,
528 struct device_attribute *attr,
529 const char *buf, size_t count)
531 struct i2c_client *client = to_i2c_client(dev);
532 struct elan_tp_data *data = i2c_get_clientdata(client);
538 retval = mutex_lock_interruptible(&data->sysfs_mutex);
542 disable_irq(client->irq);
544 data->mode |= ETP_ENABLE_CALIBRATE;
545 retval = data->ops->set_mode(client, data->mode);
547 dev_err(dev, "failed to enable calibration mode: %d\n",
552 retval = data->ops->calibrate(client);
554 dev_err(dev, "failed to start calibration: %d\n",
556 goto out_disable_calibrate;
561 /* Wait 250ms before checking if calibration has completed. */
564 retval = data->ops->calibrate_result(client, val);
566 dev_err(dev, "failed to check calibration result: %d\n",
568 else if (val[0] == 0)
569 break; /* calibration done */
574 dev_err(dev, "failed to calibrate. Timeout.\n");
578 out_disable_calibrate:
579 data->mode &= ~ETP_ENABLE_CALIBRATE;
580 error = data->ops->set_mode(data->client, data->mode);
582 dev_err(dev, "failed to disable calibration mode: %d\n",
588 enable_irq(client->irq);
589 mutex_unlock(&data->sysfs_mutex);
590 return retval ?: count;
593 static ssize_t elan_sysfs_read_mode(struct device *dev,
594 struct device_attribute *attr,
597 struct i2c_client *client = to_i2c_client(dev);
598 struct elan_tp_data *data = i2c_get_clientdata(client);
602 error = mutex_lock_interruptible(&data->sysfs_mutex);
606 error = data->ops->iap_get_mode(data->client, &mode);
608 mutex_unlock(&data->sysfs_mutex);
613 return sprintf(buf, "%d\n", (int)mode);
616 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
617 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
618 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
619 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
620 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
621 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
622 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
624 static DEVICE_ATTR_WO(calibrate);
626 static struct attribute *elan_sysfs_entries[] = {
627 &dev_attr_product_id.attr,
628 &dev_attr_firmware_version.attr,
629 &dev_attr_sample_version.attr,
630 &dev_attr_iap_version.attr,
631 &dev_attr_fw_checksum.attr,
632 &dev_attr_calibrate.attr,
634 &dev_attr_update_fw.attr,
638 static const struct attribute_group elan_sysfs_group = {
639 .attrs = elan_sysfs_entries,
642 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
643 const char *buf, size_t count)
645 struct i2c_client *client = to_i2c_client(dev);
646 struct elan_tp_data *data = i2c_get_clientdata(client);
650 retval = mutex_lock_interruptible(&data->sysfs_mutex);
654 disable_irq(client->irq);
656 data->baseline_ready = false;
658 data->mode |= ETP_ENABLE_CALIBRATE;
659 retval = data->ops->set_mode(data->client, data->mode);
661 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
668 retval = data->ops->get_baseline_data(data->client, true,
669 &data->max_baseline);
671 dev_err(dev, "Failed to read max baseline form device: %d\n",
673 goto out_disable_calibrate;
676 retval = data->ops->get_baseline_data(data->client, false,
677 &data->min_baseline);
679 dev_err(dev, "Failed to read min baseline form device: %d\n",
681 goto out_disable_calibrate;
684 data->baseline_ready = true;
686 out_disable_calibrate:
687 data->mode &= ~ETP_ENABLE_CALIBRATE;
688 error = data->ops->set_mode(data->client, data->mode);
690 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
696 enable_irq(client->irq);
697 mutex_unlock(&data->sysfs_mutex);
698 return retval ?: count;
701 static ssize_t min_show(struct device *dev,
702 struct device_attribute *attr, char *buf)
704 struct i2c_client *client = to_i2c_client(dev);
705 struct elan_tp_data *data = i2c_get_clientdata(client);
708 retval = mutex_lock_interruptible(&data->sysfs_mutex);
712 if (!data->baseline_ready) {
717 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
720 mutex_unlock(&data->sysfs_mutex);
724 static ssize_t max_show(struct device *dev,
725 struct device_attribute *attr, char *buf)
727 struct i2c_client *client = to_i2c_client(dev);
728 struct elan_tp_data *data = i2c_get_clientdata(client);
731 retval = mutex_lock_interruptible(&data->sysfs_mutex);
735 if (!data->baseline_ready) {
740 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
743 mutex_unlock(&data->sysfs_mutex);
748 static DEVICE_ATTR_WO(acquire);
749 static DEVICE_ATTR_RO(min);
750 static DEVICE_ATTR_RO(max);
752 static struct attribute *elan_baseline_sysfs_entries[] = {
753 &dev_attr_acquire.attr,
759 static const struct attribute_group elan_baseline_sysfs_group = {
761 .attrs = elan_baseline_sysfs_entries,
764 static const struct attribute_group *elan_sysfs_groups[] = {
766 &elan_baseline_sysfs_group,
771 ******************************************************************
773 ******************************************************************
775 static void elan_report_contact(struct elan_tp_data *data,
776 int contact_num, bool contact_valid,
779 struct input_dev *input = data->input;
780 unsigned int pos_x, pos_y;
781 unsigned int pressure, mk_x, mk_y;
782 unsigned int area_x, area_y, major, minor;
783 unsigned int scaled_pressure;
786 pos_x = ((finger_data[0] & 0xf0) << 4) |
788 pos_y = ((finger_data[0] & 0x0f) << 8) |
790 mk_x = (finger_data[3] & 0x0f);
791 mk_y = (finger_data[3] >> 4);
792 pressure = finger_data[4];
794 if (pos_x > data->max_x || pos_y > data->max_y) {
795 dev_dbg(input->dev.parent,
796 "[%d] x=%d y=%d over max (%d, %d)",
797 contact_num, pos_x, pos_y,
798 data->max_x, data->max_y);
803 * To avoid treating large finger as palm, let's reduce the
804 * width x and y per trace.
806 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
807 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
809 major = max(area_x, area_y);
810 minor = min(area_x, area_y);
812 scaled_pressure = pressure + data->pressure_adjustment;
814 if (scaled_pressure > ETP_MAX_PRESSURE)
815 scaled_pressure = ETP_MAX_PRESSURE;
817 input_mt_slot(input, contact_num);
818 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
819 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
820 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
821 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
822 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
823 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
824 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
826 input_mt_slot(input, contact_num);
827 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
831 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
833 struct input_dev *input = data->input;
834 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
836 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
837 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
838 bool contact_valid, hover_event;
840 hover_event = hover_info & 0x40;
841 for (i = 0; i < ETP_MAX_FINGERS; i++) {
842 contact_valid = tp_info & (1U << (3 + i));
843 elan_report_contact(data, i, contact_valid, finger_data);
846 finger_data += ETP_FINGER_DATA_LEN;
849 input_report_key(input, BTN_LEFT, tp_info & 0x01);
850 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
851 input_mt_report_pointer_emulation(input, true);
855 static irqreturn_t elan_isr(int irq, void *dev_id)
857 struct elan_tp_data *data = dev_id;
858 struct device *dev = &data->client->dev;
860 u8 report[ETP_MAX_REPORT_LEN];
863 * When device is connected to i2c bus, when all IAP page writes
864 * complete, the driver will receive interrupt and must read
865 * 0000 to confirm that IAP is finished.
867 if (data->in_fw_update) {
868 complete(&data->fw_completion);
872 error = data->ops->get_report(data->client, report);
876 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
877 dev_err(dev, "invalid report id data (%x)\n",
878 report[ETP_REPORT_ID_OFFSET]);
880 elan_report_absolute(data, report);
887 ******************************************************************
888 * Elan initialization functions
889 ******************************************************************
891 static int elan_setup_input_device(struct elan_tp_data *data)
893 struct device *dev = &data->client->dev;
894 struct input_dev *input;
895 unsigned int max_width = max(data->width_x, data->width_y);
896 unsigned int min_width = min(data->width_x, data->width_y);
899 input = devm_input_allocate_device(dev);
903 input->name = "Elan Touchpad";
904 input->id.bustype = BUS_I2C;
905 input_set_drvdata(input, data);
907 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
908 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
910 dev_err(dev, "failed to initialize MT slots: %d\n", error);
914 __set_bit(EV_ABS, input->evbit);
915 __set_bit(INPUT_PROP_POINTER, input->propbit);
916 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
917 __set_bit(BTN_LEFT, input->keybit);
919 /* Set up ST parameters */
920 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
921 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
922 input_abs_set_res(input, ABS_X, data->x_res);
923 input_abs_set_res(input, ABS_Y, data->y_res);
924 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
925 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
926 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
928 /* And MT parameters */
929 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
930 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
931 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
932 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
933 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
934 ETP_MAX_PRESSURE, 0, 0);
935 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
936 ETP_FINGER_WIDTH * max_width, 0, 0);
937 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
938 ETP_FINGER_WIDTH * min_width, 0, 0);
945 static void elan_disable_regulator(void *_data)
947 struct elan_tp_data *data = _data;
949 regulator_disable(data->vcc);
952 static void elan_remove_sysfs_groups(void *_data)
954 struct elan_tp_data *data = _data;
956 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
959 static int elan_probe(struct i2c_client *client,
960 const struct i2c_device_id *dev_id)
962 const struct elan_transport_ops *transport_ops;
963 struct device *dev = &client->dev;
964 struct elan_tp_data *data;
965 unsigned long irqflags;
968 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
969 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
970 transport_ops = &elan_i2c_ops;
971 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
972 i2c_check_functionality(client->adapter,
973 I2C_FUNC_SMBUS_BYTE_DATA |
974 I2C_FUNC_SMBUS_BLOCK_DATA |
975 I2C_FUNC_SMBUS_I2C_BLOCK)) {
976 transport_ops = &elan_smbus_ops;
978 dev_err(dev, "not a supported I2C/SMBus adapter\n");
982 data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data),
987 i2c_set_clientdata(client, data);
989 data->ops = transport_ops;
990 data->client = client;
991 init_completion(&data->fw_completion);
992 mutex_init(&data->sysfs_mutex);
994 data->vcc = devm_regulator_get(&client->dev, "vcc");
995 if (IS_ERR(data->vcc)) {
996 error = PTR_ERR(data->vcc);
997 if (error != -EPROBE_DEFER)
998 dev_err(&client->dev,
999 "Failed to get 'vcc' regulator: %d\n",
1004 error = regulator_enable(data->vcc);
1006 dev_err(&client->dev,
1007 "Failed to enable regulator: %d\n", error);
1011 error = devm_add_action(&client->dev,
1012 elan_disable_regulator, data);
1014 regulator_disable(data->vcc);
1015 dev_err(&client->dev,
1016 "Failed to add disable regulator action: %d\n",
1021 /* Initialize the touchpad. */
1022 error = elan_initialize(data);
1026 error = elan_query_device_info(data);
1030 error = elan_query_device_parameters(data);
1034 dev_dbg(&client->dev,
1035 "Elan Touchpad Information:\n"
1036 " Module product ID: 0x%04x\n"
1037 " Firmware Version: 0x%04x\n"
1038 " Sample Version: 0x%04x\n"
1039 " IAP Version: 0x%04x\n"
1040 " Max ABS X,Y: %d,%d\n"
1041 " Width X,Y: %d,%d\n"
1042 " Resolution X,Y: %d,%d (dots/mm)\n",
1047 data->max_x, data->max_y,
1048 data->width_x, data->width_y,
1049 data->x_res, data->y_res);
1051 /* Set up input device properties based on queried parameters. */
1052 error = elan_setup_input_device(data);
1057 * Systems using device tree should set up interrupt via DTS,
1058 * the rest will use the default falling edge interrupts.
1060 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1062 error = devm_request_threaded_irq(&client->dev, client->irq,
1064 irqflags | IRQF_ONESHOT,
1065 client->name, data);
1067 dev_err(&client->dev, "cannot register irq=%d\n", client->irq);
1071 error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups);
1073 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1078 error = devm_add_action(&client->dev,
1079 elan_remove_sysfs_groups, data);
1081 elan_remove_sysfs_groups(data);
1082 dev_err(&client->dev,
1083 "Failed to add sysfs cleanup action: %d\n",
1088 error = input_register_device(data->input);
1090 dev_err(&client->dev, "failed to register input device: %d\n",
1096 * Systems using device tree should set up wakeup via DTS,
1097 * the rest will configure device as wakeup source by default.
1099 if (!client->dev.of_node)
1100 device_init_wakeup(&client->dev, true);
1105 static int __maybe_unused elan_suspend(struct device *dev)
1107 struct i2c_client *client = to_i2c_client(dev);
1108 struct elan_tp_data *data = i2c_get_clientdata(client);
1112 * We are taking the mutex to make sure sysfs operations are
1113 * complete before we attempt to bring the device into low[er]
1116 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1120 disable_irq(client->irq);
1122 if (device_may_wakeup(dev)) {
1123 ret = elan_sleep(data);
1124 /* Enable wake from IRQ */
1125 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1127 ret = elan_disable_power(data);
1130 mutex_unlock(&data->sysfs_mutex);
1134 static int __maybe_unused elan_resume(struct device *dev)
1136 struct i2c_client *client = to_i2c_client(dev);
1137 struct elan_tp_data *data = i2c_get_clientdata(client);
1140 if (device_may_wakeup(dev) && data->irq_wake) {
1141 disable_irq_wake(client->irq);
1142 data->irq_wake = false;
1145 error = elan_enable_power(data);
1147 dev_err(dev, "power up when resuming failed: %d\n", error);
1151 error = elan_initialize(data);
1153 dev_err(dev, "initialize when resuming failed: %d\n", error);
1156 enable_irq(data->client->irq);
1160 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1162 static const struct i2c_device_id elan_id[] = {
1166 MODULE_DEVICE_TABLE(i2c, elan_id);
1169 static const struct acpi_device_id elan_acpi_id[] = {
1175 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1179 static const struct of_device_id elan_of_match[] = {
1180 { .compatible = "elan,ekth3000" },
1183 MODULE_DEVICE_TABLE(of, elan_of_match);
1186 static struct i2c_driver elan_driver = {
1188 .name = DRIVER_NAME,
1190 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1191 .of_match_table = of_match_ptr(elan_of_match),
1192 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1194 .probe = elan_probe,
1195 .id_table = elan_id,
1198 module_i2c_driver(elan_driver);
1200 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1201 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1202 MODULE_LICENSE("GPL");
1203 MODULE_VERSION(ELAN_DRIVER_VERSION);