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 "1.5.9"
44 #define ETP_MAX_PRESSURE 255
45 #define ETP_FWIDTH_REDUCE 90
46 #define ETP_FINGER_WIDTH 15
47 #define ETP_RETRY_COUNT 3
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, ETP_PRODUCT_ID_FORMAT_STRING "\n",
445 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
446 struct device_attribute *attr,
449 struct i2c_client *client = to_i2c_client(dev);
450 struct elan_tp_data *data = i2c_get_clientdata(client);
452 return sprintf(buf, "%d.0\n", data->fw_version);
455 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
456 struct device_attribute *attr,
459 struct i2c_client *client = to_i2c_client(dev);
460 struct elan_tp_data *data = i2c_get_clientdata(client);
462 return sprintf(buf, "%d.0\n", data->sm_version);
465 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
466 struct device_attribute *attr,
469 struct i2c_client *client = to_i2c_client(dev);
470 struct elan_tp_data *data = i2c_get_clientdata(client);
472 return sprintf(buf, "%d.0\n", data->iap_version);
475 static ssize_t elan_sysfs_update_fw(struct device *dev,
476 struct device_attribute *attr,
477 const char *buf, size_t count)
479 struct elan_tp_data *data = dev_get_drvdata(dev);
480 const struct firmware *fw;
483 const u8 *fw_signature;
484 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
486 /* Look for a firmware with the product id appended. */
487 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
489 dev_err(dev, "failed to allocate memory for firmware name\n");
493 dev_info(dev, "requesting fw '%s'\n", fw_name);
494 error = request_firmware(&fw, fw_name, dev);
497 dev_err(dev, "failed to request firmware: %d\n", error);
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);
511 error = mutex_lock_interruptible(&data->sysfs_mutex);
515 error = elan_update_firmware(data, fw);
517 mutex_unlock(&data->sysfs_mutex);
520 release_firmware(fw);
521 return error ?: count;
524 static ssize_t calibrate_store(struct device *dev,
525 struct device_attribute *attr,
526 const char *buf, size_t count)
528 struct i2c_client *client = to_i2c_client(dev);
529 struct elan_tp_data *data = i2c_get_clientdata(client);
535 retval = mutex_lock_interruptible(&data->sysfs_mutex);
539 disable_irq(client->irq);
541 data->mode |= ETP_ENABLE_CALIBRATE;
542 retval = data->ops->set_mode(client, data->mode);
544 dev_err(dev, "failed to enable calibration mode: %d\n",
549 retval = data->ops->calibrate(client);
551 dev_err(dev, "failed to start calibration: %d\n",
553 goto out_disable_calibrate;
558 /* Wait 250ms before checking if calibration has completed. */
561 retval = data->ops->calibrate_result(client, val);
563 dev_err(dev, "failed to check calibration result: %d\n",
565 else if (val[0] == 0)
566 break; /* calibration done */
571 dev_err(dev, "failed to calibrate. Timeout.\n");
575 out_disable_calibrate:
576 data->mode &= ~ETP_ENABLE_CALIBRATE;
577 error = data->ops->set_mode(data->client, data->mode);
579 dev_err(dev, "failed to disable calibration mode: %d\n",
585 enable_irq(client->irq);
586 mutex_unlock(&data->sysfs_mutex);
587 return retval ?: count;
590 static ssize_t elan_sysfs_read_mode(struct device *dev,
591 struct device_attribute *attr,
594 struct i2c_client *client = to_i2c_client(dev);
595 struct elan_tp_data *data = i2c_get_clientdata(client);
599 error = mutex_lock_interruptible(&data->sysfs_mutex);
603 error = data->ops->iap_get_mode(data->client, &mode);
605 mutex_unlock(&data->sysfs_mutex);
610 return sprintf(buf, "%d\n", (int)mode);
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);
621 static DEVICE_ATTR_WO(calibrate);
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,
631 &dev_attr_update_fw.attr,
635 static const struct attribute_group elan_sysfs_group = {
636 .attrs = elan_sysfs_entries,
639 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
640 const char *buf, size_t count)
642 struct i2c_client *client = to_i2c_client(dev);
643 struct elan_tp_data *data = i2c_get_clientdata(client);
647 retval = mutex_lock_interruptible(&data->sysfs_mutex);
651 disable_irq(client->irq);
653 data->baseline_ready = false;
655 data->mode |= ETP_ENABLE_CALIBRATE;
656 retval = data->ops->set_mode(data->client, data->mode);
658 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
665 retval = data->ops->get_baseline_data(data->client, true,
666 &data->max_baseline);
668 dev_err(dev, "Failed to read max baseline form device: %d\n",
670 goto out_disable_calibrate;
673 retval = data->ops->get_baseline_data(data->client, false,
674 &data->min_baseline);
676 dev_err(dev, "Failed to read min baseline form device: %d\n",
678 goto out_disable_calibrate;
681 data->baseline_ready = true;
683 out_disable_calibrate:
684 data->mode &= ~ETP_ENABLE_CALIBRATE;
685 error = data->ops->set_mode(data->client, data->mode);
687 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
693 enable_irq(client->irq);
694 mutex_unlock(&data->sysfs_mutex);
695 return retval ?: count;
698 static ssize_t min_show(struct device *dev,
699 struct device_attribute *attr, char *buf)
701 struct i2c_client *client = to_i2c_client(dev);
702 struct elan_tp_data *data = i2c_get_clientdata(client);
705 retval = mutex_lock_interruptible(&data->sysfs_mutex);
709 if (!data->baseline_ready) {
714 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
717 mutex_unlock(&data->sysfs_mutex);
721 static ssize_t max_show(struct device *dev,
722 struct device_attribute *attr, char *buf)
724 struct i2c_client *client = to_i2c_client(dev);
725 struct elan_tp_data *data = i2c_get_clientdata(client);
728 retval = mutex_lock_interruptible(&data->sysfs_mutex);
732 if (!data->baseline_ready) {
737 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
740 mutex_unlock(&data->sysfs_mutex);
745 static DEVICE_ATTR_WO(acquire);
746 static DEVICE_ATTR_RO(min);
747 static DEVICE_ATTR_RO(max);
749 static struct attribute *elan_baseline_sysfs_entries[] = {
750 &dev_attr_acquire.attr,
756 static const struct attribute_group elan_baseline_sysfs_group = {
758 .attrs = elan_baseline_sysfs_entries,
761 static const struct attribute_group *elan_sysfs_groups[] = {
763 &elan_baseline_sysfs_group,
768 ******************************************************************
770 ******************************************************************
772 static void elan_report_contact(struct elan_tp_data *data,
773 int contact_num, bool contact_valid,
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;
783 pos_x = ((finger_data[0] & 0xf0) << 4) |
785 pos_y = ((finger_data[0] & 0x0f) << 8) |
787 mk_x = (finger_data[3] & 0x0f);
788 mk_y = (finger_data[3] >> 4);
789 pressure = finger_data[4];
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);
800 * To avoid treating large finger as palm, let's reduce the
801 * width x and y per trace.
803 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
804 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
806 major = max(area_x, area_y);
807 minor = min(area_x, area_y);
809 scaled_pressure = pressure + data->pressure_adjustment;
811 if (scaled_pressure > ETP_MAX_PRESSURE)
812 scaled_pressure = ETP_MAX_PRESSURE;
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);
823 input_mt_slot(input, contact_num);
824 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
828 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
830 struct input_dev *input = data->input;
831 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
833 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
834 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
835 bool contact_valid, hover_event;
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);
843 finger_data += ETP_FINGER_DATA_LEN;
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);
852 static irqreturn_t elan_isr(int irq, void *dev_id)
854 struct elan_tp_data *data = dev_id;
855 struct device *dev = &data->client->dev;
857 u8 report[ETP_MAX_REPORT_LEN];
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.
864 if (data->in_fw_update) {
865 complete(&data->fw_completion);
869 error = data->ops->get_report(data->client, report);
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]);
877 elan_report_absolute(data, report);
884 ******************************************************************
885 * Elan initialization functions
886 ******************************************************************
888 static int elan_setup_input_device(struct elan_tp_data *data)
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);
896 input = devm_input_allocate_device(dev);
900 input->name = "Elan Touchpad";
901 input->id.bustype = BUS_I2C;
902 input_set_drvdata(input, data);
904 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
905 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
907 dev_err(dev, "failed to initialize MT slots: %d\n", error);
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);
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);
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);
942 static void elan_disable_regulator(void *_data)
944 struct elan_tp_data *data = _data;
946 regulator_disable(data->vcc);
949 static void elan_remove_sysfs_groups(void *_data)
951 struct elan_tp_data *data = _data;
953 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
956 static int elan_probe(struct i2c_client *client,
957 const struct i2c_device_id *dev_id)
959 const struct elan_transport_ops *transport_ops;
960 struct device *dev = &client->dev;
961 struct elan_tp_data *data;
962 unsigned long irqflags;
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;
975 dev_err(dev, "not a supported I2C/SMBus adapter\n");
979 data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data),
984 i2c_set_clientdata(client, data);
986 data->ops = transport_ops;
987 data->client = client;
988 init_completion(&data->fw_completion);
989 mutex_init(&data->sysfs_mutex);
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",
1001 error = regulator_enable(data->vcc);
1003 dev_err(&client->dev,
1004 "Failed to enable regulator: %d\n", error);
1008 error = devm_add_action(&client->dev,
1009 elan_disable_regulator, data);
1011 regulator_disable(data->vcc);
1012 dev_err(&client->dev,
1013 "Failed to add disable regulator action: %d\n",
1018 /* Initialize the touchpad. */
1019 error = elan_initialize(data);
1023 error = elan_query_device_info(data);
1027 error = elan_query_device_parameters(data);
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",
1044 data->max_x, data->max_y,
1045 data->width_x, data->width_y,
1046 data->x_res, data->y_res);
1048 /* Set up input device properties based on queried parameters. */
1049 error = elan_setup_input_device(data);
1054 * Systems using device tree should set up interrupt via DTS,
1055 * the rest will use the default falling edge interrupts.
1057 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1059 error = devm_request_threaded_irq(&client->dev, client->irq,
1061 irqflags | IRQF_ONESHOT,
1062 client->name, data);
1064 dev_err(&client->dev, "cannot register irq=%d\n", client->irq);
1068 error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups);
1070 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1075 error = devm_add_action(&client->dev,
1076 elan_remove_sysfs_groups, data);
1078 elan_remove_sysfs_groups(data);
1079 dev_err(&client->dev,
1080 "Failed to add sysfs cleanup action: %d\n",
1085 error = input_register_device(data->input);
1087 dev_err(&client->dev, "failed to register input device: %d\n",
1093 * Systems using device tree should set up wakeup via DTS,
1094 * the rest will configure device as wakeup source by default.
1096 if (!client->dev.of_node)
1097 device_init_wakeup(&client->dev, true);
1102 static int __maybe_unused elan_suspend(struct device *dev)
1104 struct i2c_client *client = to_i2c_client(dev);
1105 struct elan_tp_data *data = i2c_get_clientdata(client);
1109 * We are taking the mutex to make sure sysfs operations are
1110 * complete before we attempt to bring the device into low[er]
1113 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1117 disable_irq(client->irq);
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);
1124 ret = elan_disable_power(data);
1127 mutex_unlock(&data->sysfs_mutex);
1131 static int __maybe_unused elan_resume(struct device *dev)
1133 struct i2c_client *client = to_i2c_client(dev);
1134 struct elan_tp_data *data = i2c_get_clientdata(client);
1137 if (device_may_wakeup(dev) && data->irq_wake) {
1138 disable_irq_wake(client->irq);
1139 data->irq_wake = false;
1142 error = elan_enable_power(data);
1144 dev_err(dev, "power up when resuming failed: %d\n", error);
1148 error = elan_initialize(data);
1150 dev_err(dev, "initialize when resuming failed: %d\n", error);
1153 enable_irq(data->client->irq);
1157 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1159 static const struct i2c_device_id elan_id[] = {
1163 MODULE_DEVICE_TABLE(i2c, elan_id);
1166 static const struct acpi_device_id elan_acpi_id[] = {
1170 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1174 static const struct of_device_id elan_of_match[] = {
1175 { .compatible = "elan,ekth3000" },
1178 MODULE_DEVICE_TABLE(of, elan_of_match);
1181 static struct i2c_driver elan_driver = {
1183 .name = DRIVER_NAME,
1184 .owner = THIS_MODULE,
1186 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1187 .of_match_table = of_match_ptr(elan_of_match),
1189 .probe = elan_probe,
1190 .id_table = elan_id,
1193 module_i2c_driver(elan_driver);
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);