2 * Elan I2C/SMBus Touchpad driver
4 * Copyright (c) 2013 ELAN Microelectronics Corp.
6 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
7 * Author: KT Liao <kt.liao@emc.com.tw>
10 * Based on cyapa driver:
11 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
12 * copyright (c) 2011-2012 Google, Inc.
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License version 2 as published
16 * by the Free Software Foundation.
18 * Trademarks are the property of their respective owners.
21 #include <linux/acpi.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/firmware.h>
25 #include <linux/i2c.h>
26 #include <linux/init.h>
27 #include <linux/input/mt.h>
28 #include <linux/interrupt.h>
29 #include <linux/irq.h>
30 #include <linux/module.h>
31 #include <linux/slab.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/input.h>
35 #include <linux/uaccess.h>
36 #include <linux/jiffies.h>
37 #include <linux/completion.h>
39 #include <linux/regulator/consumer.h>
40 #include <asm/unaligned.h>
44 #define DRIVER_NAME "elan_i2c"
45 #define ELAN_DRIVER_VERSION "1.6.3"
46 #define ELAN_VENDOR_ID 0x04f3
47 #define ETP_MAX_PRESSURE 255
48 #define ETP_FWIDTH_REDUCE 90
49 #define ETP_FINGER_WIDTH 15
50 #define ETP_RETRY_COUNT 3
52 #define ETP_MAX_FINGERS 5
53 #define ETP_FINGER_DATA_LEN 5
54 #define ETP_REPORT_ID 0x5D
55 #define ETP_REPORT_ID_OFFSET 2
56 #define ETP_TOUCH_INFO_OFFSET 3
57 #define ETP_FINGER_DATA_OFFSET 4
58 #define ETP_HOVER_INFO_OFFSET 30
59 #define ETP_MAX_REPORT_LEN 34
61 /* The main device structure */
63 struct i2c_client *client;
64 struct input_dev *input;
65 struct regulator *vcc;
67 const struct elan_transport_ops *ops;
70 struct completion fw_completion;
73 struct mutex sysfs_mutex;
88 int pressure_adjustment;
91 u16 fw_validpage_count;
92 u16 fw_signature_address;
102 static int elan_get_fwinfo(u16 ic_type, u16 *validpage_count,
103 u16 *signature_address)
109 *validpage_count = 512;
117 *validpage_count = 768;
120 *validpage_count = 896;
123 *validpage_count = 640;
126 *validpage_count = 1024;
129 /* unknown ic type clear value */
130 *validpage_count = 0;
131 *signature_address = 0;
136 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
141 static int elan_enable_power(struct elan_tp_data *data)
143 int repeat = ETP_RETRY_COUNT;
146 error = regulator_enable(data->vcc);
148 dev_err(&data->client->dev,
149 "failed to enable regulator: %d\n", error);
154 error = data->ops->power_control(data->client, true);
159 } while (--repeat > 0);
161 dev_err(&data->client->dev, "failed to enable power: %d\n", error);
165 static int elan_disable_power(struct elan_tp_data *data)
167 int repeat = ETP_RETRY_COUNT;
171 error = data->ops->power_control(data->client, false);
173 error = regulator_disable(data->vcc);
175 dev_err(&data->client->dev,
176 "failed to disable regulator: %d\n",
178 /* Attempt to power the chip back up */
179 data->ops->power_control(data->client, true);
187 } while (--repeat > 0);
189 dev_err(&data->client->dev, "failed to disable power: %d\n", error);
193 static int elan_sleep(struct elan_tp_data *data)
195 int repeat = ETP_RETRY_COUNT;
199 error = data->ops->sleep_control(data->client, true);
204 } while (--repeat > 0);
209 static int elan_query_product(struct elan_tp_data *data)
213 error = data->ops->get_product_id(data->client, &data->product_id);
217 error = data->ops->get_sm_version(data->client, &data->ic_type,
218 &data->sm_version, &data->clickpad);
225 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
227 if (data->ic_type == 0x0E) {
228 switch (data->product_id) {
234 } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
235 /* ASUS EeeBook X205TA */
242 static int __elan_initialize(struct elan_tp_data *data)
244 struct i2c_client *client = data->client;
245 bool woken_up = false;
248 error = data->ops->initialize(client);
250 dev_err(&client->dev, "device initialize failed: %d\n", error);
254 error = elan_query_product(data);
259 * Some ASUS devices were shipped with firmware that requires
260 * touchpads to be woken up first, before attempting to switch
261 * them into absolute reporting mode.
263 if (elan_check_ASUS_special_fw(data)) {
264 error = data->ops->sleep_control(client, false);
266 dev_err(&client->dev,
267 "failed to wake device up: %d\n", error);
275 data->mode |= ETP_ENABLE_ABS;
276 error = data->ops->set_mode(client, data->mode);
278 dev_err(&client->dev,
279 "failed to switch to absolute mode: %d\n", error);
284 error = data->ops->sleep_control(client, false);
286 dev_err(&client->dev,
287 "failed to wake device up: %d\n", error);
295 static int elan_initialize(struct elan_tp_data *data)
297 int repeat = ETP_RETRY_COUNT;
301 error = __elan_initialize(data);
306 } while (--repeat > 0);
311 static int elan_query_device_info(struct elan_tp_data *data)
316 error = data->ops->get_version(data->client, false, &data->fw_version);
320 error = data->ops->get_checksum(data->client, false,
325 error = data->ops->get_version(data->client, true, &data->iap_version);
329 error = data->ops->get_pressure_adjustment(data->client,
330 &data->pressure_adjustment);
334 error = data->ops->get_pattern(data->client, &data->pattern);
338 if (data->pattern == 0x01)
339 ic_type = data->ic_type;
341 ic_type = data->iap_version;
343 error = elan_get_fwinfo(ic_type, &data->fw_validpage_count,
344 &data->fw_signature_address);
346 dev_warn(&data->client->dev,
347 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
348 data->iap_version, data->ic_type);
353 static unsigned int elan_convert_resolution(u8 val)
356 * (value from firmware) * 10 + 790 = dpi
358 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
362 return ((int)(char)val * 10 + 790) * 10 / 254;
365 static int elan_query_device_parameters(struct elan_tp_data *data)
367 unsigned int x_traces, y_traces;
368 u8 hw_x_res, hw_y_res;
371 error = data->ops->get_max(data->client, &data->max_x, &data->max_y);
375 error = data->ops->get_num_traces(data->client, &x_traces, &y_traces);
379 data->width_x = data->max_x / x_traces;
380 data->width_y = data->max_y / y_traces;
382 error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res);
386 data->x_res = elan_convert_resolution(hw_x_res);
387 data->y_res = elan_convert_resolution(hw_y_res);
393 **********************************************************
394 * IAP firmware updater related routines
395 **********************************************************
397 static int elan_write_fw_block(struct elan_tp_data *data,
398 const u8 *page, u16 checksum, int idx)
400 int retry = ETP_RETRY_COUNT;
404 error = data->ops->write_fw_block(data->client,
405 page, checksum, idx);
409 dev_dbg(&data->client->dev,
410 "IAP retrying page %d (error: %d)\n", idx, error);
411 } while (--retry > 0);
416 static int __elan_update_firmware(struct elan_tp_data *data,
417 const struct firmware *fw)
419 struct i2c_client *client = data->client;
420 struct device *dev = &client->dev;
425 u16 sw_checksum = 0, fw_checksum = 0;
427 error = data->ops->prepare_fw_update(client);
431 iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
433 boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
434 for (i = boot_page_count; i < data->fw_validpage_count; i++) {
436 const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
438 for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
439 checksum += ((page[j + 1] << 8) | page[j]);
441 error = elan_write_fw_block(data, page, checksum, i);
443 dev_err(dev, "write page %d fail: %d\n", i, error);
447 sw_checksum += checksum;
450 /* Wait WDT reset and power on reset */
453 error = data->ops->finish_fw_update(client, &data->fw_completion);
457 error = data->ops->get_checksum(client, true, &fw_checksum);
461 if (sw_checksum != fw_checksum) {
462 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
463 sw_checksum, fw_checksum);
470 static int elan_update_firmware(struct elan_tp_data *data,
471 const struct firmware *fw)
473 struct i2c_client *client = data->client;
476 dev_dbg(&client->dev, "Starting firmware update....\n");
478 disable_irq(client->irq);
479 data->in_fw_update = true;
481 retval = __elan_update_firmware(data, fw);
483 dev_err(&client->dev, "firmware update failed: %d\n", retval);
484 data->ops->iap_reset(client);
486 /* Reinitialize TP after fw is updated */
487 elan_initialize(data);
488 elan_query_device_info(data);
491 data->in_fw_update = false;
492 enable_irq(client->irq);
498 *******************************************************************
500 *******************************************************************
502 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
503 struct device_attribute *attr,
506 struct i2c_client *client = to_i2c_client(dev);
507 struct elan_tp_data *data = i2c_get_clientdata(client);
509 return sprintf(buf, "0x%04x\n", data->fw_checksum);
512 static ssize_t elan_sysfs_read_product_id(struct device *dev,
513 struct device_attribute *attr,
516 struct i2c_client *client = to_i2c_client(dev);
517 struct elan_tp_data *data = i2c_get_clientdata(client);
519 return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
523 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
524 struct device_attribute *attr,
527 struct i2c_client *client = to_i2c_client(dev);
528 struct elan_tp_data *data = i2c_get_clientdata(client);
530 return sprintf(buf, "%d.0\n", data->fw_version);
533 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
534 struct device_attribute *attr,
537 struct i2c_client *client = to_i2c_client(dev);
538 struct elan_tp_data *data = i2c_get_clientdata(client);
540 return sprintf(buf, "%d.0\n", data->sm_version);
543 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
544 struct device_attribute *attr,
547 struct i2c_client *client = to_i2c_client(dev);
548 struct elan_tp_data *data = i2c_get_clientdata(client);
550 return sprintf(buf, "%d.0\n", data->iap_version);
553 static ssize_t elan_sysfs_update_fw(struct device *dev,
554 struct device_attribute *attr,
555 const char *buf, size_t count)
557 struct elan_tp_data *data = dev_get_drvdata(dev);
558 const struct firmware *fw;
561 const u8 *fw_signature;
562 static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
564 if (data->fw_validpage_count == 0)
567 /* Look for a firmware with the product id appended. */
568 fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
570 dev_err(dev, "failed to allocate memory for firmware name\n");
574 dev_info(dev, "requesting fw '%s'\n", fw_name);
575 error = request_firmware(&fw, fw_name, dev);
578 dev_err(dev, "failed to request firmware: %d\n", error);
582 /* Firmware file must match signature data */
583 fw_signature = &fw->data[data->fw_signature_address];
584 if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
585 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
586 (int)sizeof(signature), signature,
587 (int)sizeof(signature), fw_signature);
592 error = mutex_lock_interruptible(&data->sysfs_mutex);
596 error = elan_update_firmware(data, fw);
598 mutex_unlock(&data->sysfs_mutex);
601 release_firmware(fw);
602 return error ?: count;
605 static ssize_t calibrate_store(struct device *dev,
606 struct device_attribute *attr,
607 const char *buf, size_t count)
609 struct i2c_client *client = to_i2c_client(dev);
610 struct elan_tp_data *data = i2c_get_clientdata(client);
616 retval = mutex_lock_interruptible(&data->sysfs_mutex);
620 disable_irq(client->irq);
622 data->mode |= ETP_ENABLE_CALIBRATE;
623 retval = data->ops->set_mode(client, data->mode);
625 dev_err(dev, "failed to enable calibration mode: %d\n",
630 retval = data->ops->calibrate(client);
632 dev_err(dev, "failed to start calibration: %d\n",
634 goto out_disable_calibrate;
639 /* Wait 250ms before checking if calibration has completed. */
642 retval = data->ops->calibrate_result(client, val);
644 dev_err(dev, "failed to check calibration result: %d\n",
646 else if (val[0] == 0)
647 break; /* calibration done */
652 dev_err(dev, "failed to calibrate. Timeout.\n");
656 out_disable_calibrate:
657 data->mode &= ~ETP_ENABLE_CALIBRATE;
658 error = data->ops->set_mode(data->client, data->mode);
660 dev_err(dev, "failed to disable calibration mode: %d\n",
666 enable_irq(client->irq);
667 mutex_unlock(&data->sysfs_mutex);
668 return retval ?: count;
671 static ssize_t elan_sysfs_read_mode(struct device *dev,
672 struct device_attribute *attr,
675 struct i2c_client *client = to_i2c_client(dev);
676 struct elan_tp_data *data = i2c_get_clientdata(client);
680 error = mutex_lock_interruptible(&data->sysfs_mutex);
684 error = data->ops->iap_get_mode(data->client, &mode);
686 mutex_unlock(&data->sysfs_mutex);
691 return sprintf(buf, "%d\n", (int)mode);
694 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
695 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
696 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
697 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
698 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
699 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
700 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
702 static DEVICE_ATTR_WO(calibrate);
704 static struct attribute *elan_sysfs_entries[] = {
705 &dev_attr_product_id.attr,
706 &dev_attr_firmware_version.attr,
707 &dev_attr_sample_version.attr,
708 &dev_attr_iap_version.attr,
709 &dev_attr_fw_checksum.attr,
710 &dev_attr_calibrate.attr,
712 &dev_attr_update_fw.attr,
716 static const struct attribute_group elan_sysfs_group = {
717 .attrs = elan_sysfs_entries,
720 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
721 const char *buf, size_t count)
723 struct i2c_client *client = to_i2c_client(dev);
724 struct elan_tp_data *data = i2c_get_clientdata(client);
728 retval = mutex_lock_interruptible(&data->sysfs_mutex);
732 disable_irq(client->irq);
734 data->baseline_ready = false;
736 data->mode |= ETP_ENABLE_CALIBRATE;
737 retval = data->ops->set_mode(data->client, data->mode);
739 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
746 retval = data->ops->get_baseline_data(data->client, true,
747 &data->max_baseline);
749 dev_err(dev, "Failed to read max baseline form device: %d\n",
751 goto out_disable_calibrate;
754 retval = data->ops->get_baseline_data(data->client, false,
755 &data->min_baseline);
757 dev_err(dev, "Failed to read min baseline form device: %d\n",
759 goto out_disable_calibrate;
762 data->baseline_ready = true;
764 out_disable_calibrate:
765 data->mode &= ~ETP_ENABLE_CALIBRATE;
766 error = data->ops->set_mode(data->client, data->mode);
768 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
774 enable_irq(client->irq);
775 mutex_unlock(&data->sysfs_mutex);
776 return retval ?: count;
779 static ssize_t min_show(struct device *dev,
780 struct device_attribute *attr, char *buf)
782 struct i2c_client *client = to_i2c_client(dev);
783 struct elan_tp_data *data = i2c_get_clientdata(client);
786 retval = mutex_lock_interruptible(&data->sysfs_mutex);
790 if (!data->baseline_ready) {
795 retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
798 mutex_unlock(&data->sysfs_mutex);
802 static ssize_t max_show(struct device *dev,
803 struct device_attribute *attr, char *buf)
805 struct i2c_client *client = to_i2c_client(dev);
806 struct elan_tp_data *data = i2c_get_clientdata(client);
809 retval = mutex_lock_interruptible(&data->sysfs_mutex);
813 if (!data->baseline_ready) {
818 retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
821 mutex_unlock(&data->sysfs_mutex);
826 static DEVICE_ATTR_WO(acquire);
827 static DEVICE_ATTR_RO(min);
828 static DEVICE_ATTR_RO(max);
830 static struct attribute *elan_baseline_sysfs_entries[] = {
831 &dev_attr_acquire.attr,
837 static const struct attribute_group elan_baseline_sysfs_group = {
839 .attrs = elan_baseline_sysfs_entries,
842 static const struct attribute_group *elan_sysfs_groups[] = {
844 &elan_baseline_sysfs_group,
849 ******************************************************************
851 ******************************************************************
853 static void elan_report_contact(struct elan_tp_data *data,
854 int contact_num, bool contact_valid,
857 struct input_dev *input = data->input;
858 unsigned int pos_x, pos_y;
859 unsigned int pressure, mk_x, mk_y;
860 unsigned int area_x, area_y, major, minor;
861 unsigned int scaled_pressure;
864 pos_x = ((finger_data[0] & 0xf0) << 4) |
866 pos_y = ((finger_data[0] & 0x0f) << 8) |
868 mk_x = (finger_data[3] & 0x0f);
869 mk_y = (finger_data[3] >> 4);
870 pressure = finger_data[4];
872 if (pos_x > data->max_x || pos_y > data->max_y) {
873 dev_dbg(input->dev.parent,
874 "[%d] x=%d y=%d over max (%d, %d)",
875 contact_num, pos_x, pos_y,
876 data->max_x, data->max_y);
881 * To avoid treating large finger as palm, let's reduce the
882 * width x and y per trace.
884 area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
885 area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
887 major = max(area_x, area_y);
888 minor = min(area_x, area_y);
890 scaled_pressure = pressure + data->pressure_adjustment;
892 if (scaled_pressure > ETP_MAX_PRESSURE)
893 scaled_pressure = ETP_MAX_PRESSURE;
895 input_mt_slot(input, contact_num);
896 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
897 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
898 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
899 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
900 input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
901 input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
902 input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
904 input_mt_slot(input, contact_num);
905 input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
909 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
911 struct input_dev *input = data->input;
912 u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
914 u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
915 u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
916 bool contact_valid, hover_event;
918 hover_event = hover_info & 0x40;
919 for (i = 0; i < ETP_MAX_FINGERS; i++) {
920 contact_valid = tp_info & (1U << (3 + i));
921 elan_report_contact(data, i, contact_valid, finger_data);
924 finger_data += ETP_FINGER_DATA_LEN;
927 input_report_key(input, BTN_LEFT, tp_info & 0x01);
928 input_report_key(input, BTN_RIGHT, tp_info & 0x02);
929 input_report_abs(input, ABS_DISTANCE, hover_event != 0);
930 input_mt_report_pointer_emulation(input, true);
934 static irqreturn_t elan_isr(int irq, void *dev_id)
936 struct elan_tp_data *data = dev_id;
937 struct device *dev = &data->client->dev;
939 u8 report[ETP_MAX_REPORT_LEN];
942 * When device is connected to i2c bus, when all IAP page writes
943 * complete, the driver will receive interrupt and must read
944 * 0000 to confirm that IAP is finished.
946 if (data->in_fw_update) {
947 complete(&data->fw_completion);
951 error = data->ops->get_report(data->client, report);
955 if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID)
956 dev_err(dev, "invalid report id data (%x)\n",
957 report[ETP_REPORT_ID_OFFSET]);
959 elan_report_absolute(data, report);
966 ******************************************************************
967 * Elan initialization functions
968 ******************************************************************
970 static int elan_setup_input_device(struct elan_tp_data *data)
972 struct device *dev = &data->client->dev;
973 struct input_dev *input;
974 unsigned int max_width = max(data->width_x, data->width_y);
975 unsigned int min_width = min(data->width_x, data->width_y);
978 input = devm_input_allocate_device(dev);
982 input->name = "Elan Touchpad";
983 input->id.bustype = BUS_I2C;
984 input->id.vendor = ELAN_VENDOR_ID;
985 input->id.product = data->product_id;
986 input_set_drvdata(input, data);
988 error = input_mt_init_slots(input, ETP_MAX_FINGERS,
989 INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
991 dev_err(dev, "failed to initialize MT slots: %d\n", error);
995 __set_bit(EV_ABS, input->evbit);
996 __set_bit(INPUT_PROP_POINTER, input->propbit);
998 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1000 __set_bit(BTN_RIGHT, input->keybit);
1001 __set_bit(BTN_LEFT, input->keybit);
1003 /* Set up ST parameters */
1004 input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1005 input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1006 input_abs_set_res(input, ABS_X, data->x_res);
1007 input_abs_set_res(input, ABS_Y, data->y_res);
1008 input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1009 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
1010 input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1012 /* And MT parameters */
1013 input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1014 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1015 input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1016 input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1017 input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1018 ETP_MAX_PRESSURE, 0, 0);
1019 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
1020 ETP_FINGER_WIDTH * max_width, 0, 0);
1021 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
1022 ETP_FINGER_WIDTH * min_width, 0, 0);
1024 data->input = input;
1029 static void elan_disable_regulator(void *_data)
1031 struct elan_tp_data *data = _data;
1033 regulator_disable(data->vcc);
1036 static void elan_remove_sysfs_groups(void *_data)
1038 struct elan_tp_data *data = _data;
1040 sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups);
1043 static int elan_probe(struct i2c_client *client,
1044 const struct i2c_device_id *dev_id)
1046 const struct elan_transport_ops *transport_ops;
1047 struct device *dev = &client->dev;
1048 struct elan_tp_data *data;
1049 unsigned long irqflags;
1052 if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1053 i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1054 transport_ops = &elan_i2c_ops;
1055 } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1056 i2c_check_functionality(client->adapter,
1057 I2C_FUNC_SMBUS_BYTE_DATA |
1058 I2C_FUNC_SMBUS_BLOCK_DATA |
1059 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1060 transport_ops = &elan_smbus_ops;
1062 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1066 data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1070 i2c_set_clientdata(client, data);
1072 data->ops = transport_ops;
1073 data->client = client;
1074 init_completion(&data->fw_completion);
1075 mutex_init(&data->sysfs_mutex);
1077 data->vcc = devm_regulator_get(dev, "vcc");
1078 if (IS_ERR(data->vcc)) {
1079 error = PTR_ERR(data->vcc);
1080 if (error != -EPROBE_DEFER)
1081 dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1086 error = regulator_enable(data->vcc);
1088 dev_err(dev, "Failed to enable regulator: %d\n", error);
1092 error = devm_add_action(dev, elan_disable_regulator, data);
1094 regulator_disable(data->vcc);
1095 dev_err(dev, "Failed to add disable regulator action: %d\n",
1100 /* Make sure there is something at this address */
1101 error = i2c_smbus_read_byte(client);
1103 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1107 /* Initialize the touchpad. */
1108 error = elan_initialize(data);
1112 error = elan_query_device_info(data);
1116 error = elan_query_device_parameters(data);
1121 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1128 "Elan Touchpad Extra Information:\n"
1129 " Max ABS X,Y: %d,%d\n"
1130 " Width X,Y: %d,%d\n"
1131 " Resolution X,Y: %d,%d (dots/mm)\n"
1133 " info pattern: 0x%x\n",
1134 data->max_x, data->max_y,
1135 data->width_x, data->width_y,
1136 data->x_res, data->y_res,
1137 data->ic_type, data->pattern);
1139 /* Set up input device properties based on queried parameters. */
1140 error = elan_setup_input_device(data);
1145 * Platform code (ACPI, DTS) should normally set up interrupt
1146 * for us, but in case it did not let's fall back to using falling
1147 * edge to be compatible with older Chromebooks.
1149 irqflags = irq_get_trigger_type(client->irq);
1151 irqflags = IRQF_TRIGGER_FALLING;
1153 error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1154 irqflags | IRQF_ONESHOT,
1155 client->name, data);
1157 dev_err(dev, "cannot register irq=%d\n", client->irq);
1161 error = sysfs_create_groups(&dev->kobj, elan_sysfs_groups);
1163 dev_err(dev, "failed to create sysfs attributes: %d\n", error);
1167 error = devm_add_action(dev, elan_remove_sysfs_groups, data);
1169 elan_remove_sysfs_groups(data);
1170 dev_err(dev, "Failed to add sysfs cleanup action: %d\n",
1175 error = input_register_device(data->input);
1177 dev_err(dev, "failed to register input device: %d\n", error);
1182 * Systems using device tree should set up wakeup via DTS,
1183 * the rest will configure device as wakeup source by default.
1186 device_init_wakeup(dev, true);
1191 static int __maybe_unused elan_suspend(struct device *dev)
1193 struct i2c_client *client = to_i2c_client(dev);
1194 struct elan_tp_data *data = i2c_get_clientdata(client);
1198 * We are taking the mutex to make sure sysfs operations are
1199 * complete before we attempt to bring the device into low[er]
1202 ret = mutex_lock_interruptible(&data->sysfs_mutex);
1206 disable_irq(client->irq);
1208 if (device_may_wakeup(dev)) {
1209 ret = elan_sleep(data);
1210 /* Enable wake from IRQ */
1211 data->irq_wake = (enable_irq_wake(client->irq) == 0);
1213 ret = elan_disable_power(data);
1216 mutex_unlock(&data->sysfs_mutex);
1220 static int __maybe_unused elan_resume(struct device *dev)
1222 struct i2c_client *client = to_i2c_client(dev);
1223 struct elan_tp_data *data = i2c_get_clientdata(client);
1226 if (device_may_wakeup(dev) && data->irq_wake) {
1227 disable_irq_wake(client->irq);
1228 data->irq_wake = false;
1231 error = elan_enable_power(data);
1233 dev_err(dev, "power up when resuming failed: %d\n", error);
1237 error = elan_initialize(data);
1239 dev_err(dev, "initialize when resuming failed: %d\n", error);
1242 enable_irq(data->client->irq);
1246 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1248 static const struct i2c_device_id elan_id[] = {
1252 MODULE_DEVICE_TABLE(i2c, elan_id);
1255 static const struct acpi_device_id elan_acpi_id[] = {
1269 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1273 static const struct of_device_id elan_of_match[] = {
1274 { .compatible = "elan,ekth3000" },
1277 MODULE_DEVICE_TABLE(of, elan_of_match);
1280 static struct i2c_driver elan_driver = {
1282 .name = DRIVER_NAME,
1284 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1285 .of_match_table = of_match_ptr(elan_of_match),
1286 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1288 .probe = elan_probe,
1289 .id_table = elan_id,
1292 module_i2c_driver(elan_driver);
1294 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1295 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1296 MODULE_LICENSE("GPL");
1297 MODULE_VERSION(ELAN_DRIVER_VERSION);