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 "1.5.6"
44 #define ETP_PRESSURE_OFFSET 25
45 #define ETP_MAX_PRESSURE 255
46 #define ETP_FWIDTH_REDUCE 90
47 #define ETP_FINGER_WIDTH 15
48 #define ETP_RETRY_COUNT 3
50 #define ETP_MAX_FINGERS 5
51 #define ETP_FINGER_DATA_LEN 5
52 #define ETP_REPORT_ID 0x5D
53 #define ETP_REPORT_ID_OFFSET 2
54 #define ETP_TOUCH_INFO_OFFSET 3
55 #define ETP_FINGER_DATA_OFFSET 4
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;
94 static int elan_enable_power(struct elan_tp_data *data)
96 int repeat = ETP_RETRY_COUNT;
99 error = regulator_enable(data->vcc);
101 dev_err(&data->client->dev,
102 "Failed to enable regulator: %d\n", error);
107 error = data->ops->power_control(data->client, true);
112 } while (--repeat > 0);
117 static int elan_disable_power(struct elan_tp_data *data)
119 int repeat = ETP_RETRY_COUNT;
123 error = data->ops->power_control(data->client, false);
125 error = regulator_disable(data->vcc);
127 dev_err(&data->client->dev,
128 "Failed to disable regulator: %d\n",
130 /* Attempt to power the chip back up */
131 data->ops->power_control(data->client, true);
139 } while (--repeat > 0);
144 static int elan_sleep(struct elan_tp_data *data)
146 int repeat = ETP_RETRY_COUNT;
150 error = data->ops->sleep_control(data->client, true);
155 } while (--repeat > 0);
160 static int __elan_initialize(struct elan_tp_data *data)
162 struct i2c_client *client = data->client;
165 error = data->ops->initialize(client);
167 dev_err(&client->dev, "device initialize failed: %d\n", error);
171 data->mode |= ETP_ENABLE_ABS;
172 error = data->ops->set_mode(client, data->mode);
174 dev_err(&client->dev,
175 "failed to switch to absolute mode: %d\n", error);
179 error = data->ops->sleep_control(client, false);
181 dev_err(&client->dev,
182 "failed to wake device up: %d\n", error);
189 static int elan_initialize(struct elan_tp_data *data)
191 int repeat = ETP_RETRY_COUNT;
195 error = __elan_initialize(data);
201 } while (--repeat > 0);
206 static int elan_query_device_info(struct elan_tp_data *data)
210 error = data->ops->get_product_id(data->client, &data->product_id);
214 error = data->ops->get_version(data->client, false, &data->fw_version);
218 error = data->ops->get_checksum(data->client, false,
223 error = data->ops->get_sm_version(data->client, &data->sm_version);
227 error = data->ops->get_version(data->client, true, &data->iap_version);
234 static unsigned int elan_convert_resolution(u8 val)
237 * (value from firmware) * 10 + 790 = dpi
239 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
243 return ((int)(char)val * 10 + 790) * 10 / 254;
246 static int elan_query_device_parameters(struct elan_tp_data *data)
248 unsigned int x_traces, y_traces;
249 u8 hw_x_res, hw_y_res;
252 error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
256 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
260 data->width_x = data->max_x / x_traces;
261 data->width_y = data->max_y / y_traces;
263 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
267 data->x_res = elan_convert_resolution(hw_x_res);
268 data->y_res = elan_convert_resolution(hw_y_res);
274 **********************************************************
275 * IAP firmware updater related routines
276 **********************************************************
278 static int elan_write_fw_block(struct elan_tp_data *data,
279 const u8 *page, u16 checksum, int idx)
281 int retry = ETP_RETRY_COUNT;
285 error = data->ops->write_fw_block(data->client,
286 page, checksum, idx);
290 dev_dbg(&data->client->dev,
291 "IAP retrying page %d (error: %d)\n", idx, error);
292 } while (--retry > 0);
297 static int __elan_update_firmware(struct elan_tp_data *data,
298 const struct firmware *fw)
300 struct i2c_client *client = data->client;
301 struct device *dev = &client->dev;
306 u16 sw_checksum = 0, fw_checksum = 0;
308 error = data->ops->prepare_fw_update(client);
312 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
314 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
315 for (i = boot_page_count; i < ETP_FW_VAILDPAGE_COUNT; i++) {
317 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
319 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
320 checksum += ((page[j + 1] << 8) | page[j]);
322 error = elan_write_fw_block(data, page, checksum, i);
324 dev_err(dev, "write page %d fail: %d\n", i, error);
328 sw_checksum += checksum;
331 /* Wait WDT reset and power on reset */
334 error = data->ops->finish_fw_update(client, &data->fw_completion);
338 error = data->ops->get_checksum(client, true, &fw_checksum);
342 if (sw_checksum != fw_checksum) {
343 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
344 sw_checksum, fw_checksum);
351 static int elan_update_firmware(struct elan_tp_data *data,
352 const struct firmware *fw)
354 struct i2c_client *client = data->client;
357 dev_dbg(&client->dev, "Starting firmware update....\n");
359 disable_irq(client->irq);
360 data->in_fw_update = true;
362 retval = __elan_update_firmware(data, fw);
364 dev_err(&client->dev, "firmware update failed: %d\n", retval);
365 data->ops->iap_reset(client);
367 /* Reinitialize TP after fw is updated */
368 elan_initialize(data);
369 elan_query_device_info(data);
372 data->in_fw_update = false;
373 enable_irq(client->irq);
379 *******************************************************************
381 *******************************************************************
383 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
384 struct device_attribute *attr,
387 struct i2c_client *client = to_i2c_client(dev);
388 struct elan_tp_data *data = i2c_get_clientdata(client);
390 return sprintf(buf, "0x%04x\n", data->fw_checksum);
393 static ssize_t elan_sysfs_read_product_id(struct device *dev,
394 struct device_attribute *attr,
397 struct i2c_client *client = to_i2c_client(dev);
398 struct elan_tp_data *data = i2c_get_clientdata(client);
400 return sprintf(buf, "%d.0\n", data->product_id);
403 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
404 struct device_attribute *attr,
407 struct i2c_client *client = to_i2c_client(dev);
408 struct elan_tp_data *data = i2c_get_clientdata(client);
410 return sprintf(buf, "%d.0\n", data->fw_version);
413 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
414 struct device_attribute *attr,
417 struct i2c_client *client = to_i2c_client(dev);
418 struct elan_tp_data *data = i2c_get_clientdata(client);
420 return sprintf(buf, "%d.0\n", data->sm_version);
423 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
424 struct device_attribute *attr,
427 struct i2c_client *client = to_i2c_client(dev);
428 struct elan_tp_data *data = i2c_get_clientdata(client);
430 return sprintf(buf, "%d.0\n", data->iap_version);
433 static ssize_t elan_sysfs_update_fw(struct device *dev,
434 struct device_attribute *attr,
435 const char *buf, size_t count)
437 struct elan_tp_data *data = dev_get_drvdata(dev);
438 const struct firmware *fw;
440 const u8 *fw_signature;
441 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
443 error = request_firmware(&fw, ETP_FW_NAME, dev);
445 dev_err(dev, "cannot load firmware %s: %d\n",
450 /* Firmware file must match signature data */
451 fw_signature = &fw->data[ETP_FW_SIGNATURE_ADDRESS];
452 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
453 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
454 (int)sizeof(signature), signature,
455 (int)sizeof(signature), fw_signature);
460 error = mutex_lock_interruptible(&data->sysfs_mutex);
464 error = elan_update_firmware(data, fw);
466 mutex_unlock(&data->sysfs_mutex);
469 release_firmware(fw);
470 return error ?: count;
473 static ssize_t calibrate_store(struct device *dev,
474 struct device_attribute *attr,
475 const char *buf, size_t count)
477 struct i2c_client *client = to_i2c_client(dev);
478 struct elan_tp_data *data = i2c_get_clientdata(client);
484 retval = mutex_lock_interruptible(&data->sysfs_mutex);
488 disable_irq(client->irq);
490 data->mode |= ETP_ENABLE_CALIBRATE;
491 retval = data->ops->set_mode(client, data->mode);
493 dev_err(dev, "failed to enable calibration mode: %d\n",
498 retval = data->ops->calibrate(client);
500 dev_err(dev, "failed to start calibration: %d\n",
502 goto out_disable_calibrate;
507 /* Wait 250ms before checking if calibration has completed. */
510 retval = data->ops->calibrate_result(client, val);
512 dev_err(dev, "failed to check calibration result: %d\n",
514 else if (val[0] == 0)
515 break; /* calibration done */
520 dev_err(dev, "failed to calibrate. Timeout.\n");
524 out_disable_calibrate:
525 data->mode &= ~ETP_ENABLE_CALIBRATE;
526 error = data->ops->set_mode(data->client, data->mode);
528 dev_err(dev, "failed to disable calibration mode: %d\n",
534 enable_irq(client->irq);
535 mutex_unlock(&data->sysfs_mutex);
536 return retval ?: count;
539 static ssize_t elan_sysfs_read_mode(struct device *dev,
540 struct device_attribute *attr,
543 struct i2c_client *client = to_i2c_client(dev);
544 struct elan_tp_data *data = i2c_get_clientdata(client);
548 error = mutex_lock_interruptible(&data->sysfs_mutex);
552 error = data->ops->iap_get_mode(data->client, &mode);
554 mutex_unlock(&data->sysfs_mutex);
559 return sprintf(buf, "%d\n", (int)mode);
562 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
563 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
564 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
565 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
566 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
567 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
568 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
570 static DEVICE_ATTR_WO(calibrate);
572 static struct attribute *elan_sysfs_entries[] = {
573 &dev_attr_product_id.attr,
574 &dev_attr_firmware_version.attr,
575 &dev_attr_sample_version.attr,
576 &dev_attr_iap_version.attr,
577 &dev_attr_fw_checksum.attr,
578 &dev_attr_calibrate.attr,
580 &dev_attr_update_fw.attr,
584 static const struct attribute_group elan_sysfs_group = {
585 .attrs = elan_sysfs_entries,
588 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
589 const char *buf, size_t count)
591 struct i2c_client *client = to_i2c_client(dev);
592 struct elan_tp_data *data = i2c_get_clientdata(client);
596 retval = mutex_lock_interruptible(&data->sysfs_mutex);
600 disable_irq(client->irq);
602 data->baseline_ready = false;
604 data->mode |= ETP_ENABLE_CALIBRATE;
605 retval = data->ops->set_mode(data->client, data->mode);
607 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
614 retval = data->ops->get_baseline_data(data->client, true,
615 &data->max_baseline);
617 dev_err(dev, "Failed to read max baseline form device: %d\n",
619 goto out_disable_calibrate;
622 retval = data->ops->get_baseline_data(data->client, false,
623 &data->min_baseline);
625 dev_err(dev, "Failed to read min baseline form device: %d\n",
627 goto out_disable_calibrate;
630 data->baseline_ready = true;
632 out_disable_calibrate:
633 data->mode &= ~ETP_ENABLE_CALIBRATE;
634 error = data->ops->set_mode(data->client, data->mode);
636 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
642 enable_irq(client->irq);
643 mutex_unlock(&data->sysfs_mutex);
644 return retval ?: count;
647 static ssize_t min_show(struct device *dev,
648 struct device_attribute *attr, char *buf)
650 struct i2c_client *client = to_i2c_client(dev);
651 struct elan_tp_data *data = i2c_get_clientdata(client);
654 retval = mutex_lock_interruptible(&data->sysfs_mutex);
658 if (!data->baseline_ready) {
663 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
666 mutex_unlock(&data->sysfs_mutex);
670 static ssize_t max_show(struct device *dev,
671 struct device_attribute *attr, char *buf)
673 struct i2c_client *client = to_i2c_client(dev);
674 struct elan_tp_data *data = i2c_get_clientdata(client);
677 retval = mutex_lock_interruptible(&data->sysfs_mutex);
681 if (!data->baseline_ready) {
686 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
689 mutex_unlock(&data->sysfs_mutex);
694 static DEVICE_ATTR_WO(acquire);
695 static DEVICE_ATTR_RO(min);
696 static DEVICE_ATTR_RO(max);
698 static struct attribute *elan_baseline_sysfs_entries[] = {
699 &dev_attr_acquire.attr,
705 static const struct attribute_group elan_baseline_sysfs_group = {
707 .attrs = elan_baseline_sysfs_entries,
710 static const struct attribute_group *elan_sysfs_groups[] = {
712 &elan_baseline_sysfs_group,
717 ******************************************************************
719 ******************************************************************
721 static void elan_report_contact(struct elan_tp_data *data,
722 int contact_num, bool contact_valid,
725 struct input_dev *input = data->input;
726 unsigned int pos_x, pos_y;
727 unsigned int pressure, mk_x, mk_y;
728 unsigned int area_x, area_y, major, minor, new_pressure;
732 pos_x = ((finger_data[0] & 0xf0) << 4) |
734 pos_y = ((finger_data[0] & 0x0f) << 8) |
736 mk_x = (finger_data[3] & 0x0f);
737 mk_y = (finger_data[3] >> 4);
738 pressure = finger_data[4];
740 if (pos_x > data->max_x || pos_y > data->max_y) {
741 dev_dbg(input->dev.parent,
742 "[%d] x=%d y=%d over max (%d, %d)",
743 contact_num, pos_x, pos_y,
744 data->max_x, data->max_y);
749 * To avoid treating large finger as palm, let's reduce the
750 * width x and y per trace.
752 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
753 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
755 major = max(area_x, area_y);
756 minor = min(area_x, area_y);
758 new_pressure = pressure + ETP_PRESSURE_OFFSET;
759 if (new_pressure > ETP_MAX_PRESSURE)
760 new_pressure = ETP_MAX_PRESSURE;
762 input_mt_slot(input, contact_num);
763 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
764 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
765 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
766 input_report_abs(input, ABS_MT_PRESSURE, new_pressure);
767 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
768 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
769 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
771 input_mt_slot(input, contact_num);
772 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
776 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
778 struct input_dev *input = data->input;
779 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
781 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
784 for (i = 0; i < ETP_MAX_FINGERS; i++) {
785 contact_valid = tp_info & (1U << (3 + i));
786 elan_report_contact(data, i, contact_valid, finger_data);
789 finger_data += ETP_FINGER_DATA_LEN;
792 input_report_key(input, BTN_LEFT, tp_info & 0x01);
793 input_mt_report_pointer_emulation(input, true);
797 static irqreturn_t elan_isr(int irq, void *dev_id)
799 struct elan_tp_data *data = dev_id;
800 struct device *dev = &data->client->dev;
802 u8 report[ETP_MAX_REPORT_LEN];
805 * When device is connected to i2c bus, when all IAP page writes
806 * complete, the driver will receive interrupt and must read
807 * 0000 to confirm that IAP is finished.
809 if (data->in_fw_update) {
810 complete(&data->fw_completion);
814 error = data->ops->get_report(data->client, report);
818 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
819 dev_err(dev, "invalid report id data (%x)\n",
820 report[ETP_REPORT_ID_OFFSET]);
822 elan_report_absolute(data, report);
829 ******************************************************************
830 * Elan initialization functions
831 ******************************************************************
833 static int elan_setup_input_device(struct elan_tp_data *data)
835 struct device *dev = &data->client->dev;
836 struct input_dev *input;
837 unsigned int max_width = max(data->width_x, data->width_y);
838 unsigned int min_width = min(data->width_x, data->width_y);
841 input = devm_input_allocate_device(dev);
845 input->name = "Elan Touchpad";
846 input->id.bustype = BUS_I2C;
847 input_set_drvdata(input, data);
849 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
850 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
852 dev_err(dev, "failed to initialize MT slots: %d\n", error);
856 __set_bit(EV_ABS, input->evbit);
857 __set_bit(INPUT_PROP_POINTER, input->propbit);
858 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
859 __set_bit(BTN_LEFT, input->keybit);
861 /* Set up ST parameters */
862 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
863 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
864 input_abs_set_res(input, ABS_X, data->x_res);
865 input_abs_set_res(input, ABS_Y, data->y_res);
866 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
867 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
869 /* And MT parameters */
870 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
871 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
872 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
873 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
874 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
875 ETP_MAX_PRESSURE, 0, 0);
876 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
877 ETP_FINGER_WIDTH * max_width, 0, 0);
878 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
879 ETP_FINGER_WIDTH * min_width, 0, 0);
886 static void elan_disable_regulator(void *_data)
888 struct elan_tp_data *data = _data;
890 regulator_disable(data->vcc);
893 static void elan_remove_sysfs_groups(void *_data)
895 struct elan_tp_data *data = _data;
897 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
900 static int elan_probe(struct i2c_client *client,
901 const struct i2c_device_id *dev_id)
903 const struct elan_transport_ops *transport_ops;
904 struct device *dev = &client->dev;
905 struct elan_tp_data *data;
906 unsigned long irqflags;
909 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
910 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
911 transport_ops = &elan_i2c_ops;
912 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
913 i2c_check_functionality(client->adapter,
914 I2C_FUNC_SMBUS_BYTE_DATA |
915 I2C_FUNC_SMBUS_BLOCK_DATA |
916 I2C_FUNC_SMBUS_I2C_BLOCK)) {
917 transport_ops = &elan_smbus_ops;
919 dev_err(dev, "not a supported I2C/SMBus adapter\n");
923 data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data),
928 i2c_set_clientdata(client, data);
930 data->ops = transport_ops;
931 data->client = client;
932 init_completion(&data->fw_completion);
933 mutex_init(&data->sysfs_mutex);
935 data->vcc = devm_regulator_get(&client->dev, "vcc");
936 if (IS_ERR(data->vcc)) {
937 error = PTR_ERR(data->vcc);
938 if (error != -EPROBE_DEFER)
939 dev_err(&client->dev,
940 "Failed to get 'vcc' regulator: %d\n",
945 error = regulator_enable(data->vcc);
947 dev_err(&client->dev,
948 "Failed to enable regulator: %d\n", error);
952 error = devm_add_action(&client->dev,
953 elan_disable_regulator, data);
955 regulator_disable(data->vcc);
956 dev_err(&client->dev,
957 "Failed to add disable regulator action: %d\n",
962 /* Initialize the touchpad. */
963 error = elan_initialize(data);
967 error = elan_query_device_info(data);
971 error = elan_query_device_parameters(data);
975 dev_dbg(&client->dev,
976 "Elan Touchpad Information:\n"
977 " Module product ID: 0x%04x\n"
978 " Firmware Version: 0x%04x\n"
979 " Sample Version: 0x%04x\n"
980 " IAP Version: 0x%04x\n"
981 " Max ABS X,Y: %d,%d\n"
982 " Width X,Y: %d,%d\n"
983 " Resolution X,Y: %d,%d (dots/mm)\n",
988 data->max_x, data->max_y,
989 data->width_x, data->width_y,
990 data->x_res, data->y_res);
992 /* Set up input device properties based on queried parameters. */
993 error = elan_setup_input_device(data);
998 * Systems using device tree should set up interrupt via DTS,
999 * the rest will use the default falling edge interrupts.
1001 irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING;
1003 error = devm_request_threaded_irq(&client->dev, client->irq,
1005 irqflags | IRQF_ONESHOT,
1006 client->name, data);
1008 dev_err(&client->dev, "cannot register irq=%d\n", client->irq);
1012 error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups);
1014 dev_err(&client->dev, "failed to create sysfs attributes: %d\n",
1019 error = devm_add_action(&client->dev,
1020 elan_remove_sysfs_groups, data);
1022 elan_remove_sysfs_groups(data);
1023 dev_err(&client->dev,
1024 "Failed to add sysfs cleanup action: %d\n",
1029 error = input_register_device(data->input);
1031 dev_err(&client->dev, "failed to register input device: %d\n",
1037 * Systems using device tree should set up wakeup via DTS,
1038 * the rest will configure device as wakeup source by default.
1040 if (!client->dev.of_node)
1041 device_init_wakeup(&client->dev, true);
1046 static int __maybe_unused elan_suspend(struct device *dev)
1048 struct i2c_client *client = to_i2c_client(dev);
1049 struct elan_tp_data *data = i2c_get_clientdata(client);
1053 * We are taking the mutex to make sure sysfs operations are
1054 * complete before we attempt to bring the device into low[er]
1057 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1061 disable_irq(client->irq);
1063 if (device_may_wakeup(dev)) {
1064 ret = elan_sleep(data);
1065 /* Enable wake from IRQ */
1066 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1068 ret = elan_disable_power(data);
1071 mutex_unlock(&data->sysfs_mutex);
1075 static int __maybe_unused elan_resume(struct device *dev)
1077 struct i2c_client *client = to_i2c_client(dev);
1078 struct elan_tp_data *data = i2c_get_clientdata(client);
1081 if (device_may_wakeup(dev) && data->irq_wake) {
1082 disable_irq_wake(client->irq);
1083 data->irq_wake = false;
1086 error = elan_enable_power(data);
1088 dev_err(dev, "power up when resuming failed: %d\n", error);
1090 error = elan_initialize(data);
1092 dev_err(dev, "initialize when resuming failed: %d\n", error);
1094 enable_irq(data->client->irq);
1099 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1101 static const struct i2c_device_id elan_id[] = {
1105 MODULE_DEVICE_TABLE(i2c, elan_id);
1108 static const struct acpi_device_id elan_acpi_id[] = {
1112 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1116 static const struct of_device_id elan_of_match[] = {
1117 { .compatible = "elan,ekth3000" },
1120 MODULE_DEVICE_TABLE(of, elan_of_match);
1123 static struct i2c_driver elan_driver = {
1125 .name = DRIVER_NAME,
1126 .owner = THIS_MODULE,
1128 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1129 .of_match_table = of_match_ptr(elan_of_match),
1131 .probe = elan_probe,
1132 .id_table = elan_id,
1135 module_i2c_driver(elan_driver);
1137 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1138 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1139 MODULE_LICENSE("GPL");
1140 MODULE_VERSION(ELAN_DRIVER_VERSION);