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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Elan I2C/SMBus Touchpad driver
0004  *
0005  * Copyright (c) 2013 ELAN Microelectronics Corp.
0006  *
0007  * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
0008  * Author: KT Liao <kt.liao@emc.com.tw>
0009  * Version: 1.6.3
0010  *
0011  * Based on cyapa driver:
0012  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
0013  * copyright (c) 2011-2012 Google, Inc.
0014  *
0015  * Trademarks are the property of their respective owners.
0016  */
0017 
0018 #include <linux/acpi.h>
0019 #include <linux/delay.h>
0020 #include <linux/device.h>
0021 #include <linux/firmware.h>
0022 #include <linux/i2c.h>
0023 #include <linux/init.h>
0024 #include <linux/input/mt.h>
0025 #include <linux/interrupt.h>
0026 #include <linux/irq.h>
0027 #include <linux/module.h>
0028 #include <linux/slab.h>
0029 #include <linux/kernel.h>
0030 #include <linux/sched.h>
0031 #include <linux/input.h>
0032 #include <linux/uaccess.h>
0033 #include <linux/jiffies.h>
0034 #include <linux/completion.h>
0035 #include <linux/of.h>
0036 #include <linux/property.h>
0037 #include <linux/regulator/consumer.h>
0038 #include <asm/unaligned.h>
0039 
0040 #include "elan_i2c.h"
0041 
0042 #define DRIVER_NAME     "elan_i2c"
0043 #define ELAN_VENDOR_ID      0x04f3
0044 #define ETP_MAX_PRESSURE    255
0045 #define ETP_FWIDTH_REDUCE   90
0046 #define ETP_FINGER_WIDTH    15
0047 #define ETP_RETRY_COUNT     3
0048 
0049 /* quirks to control the device */
0050 #define ETP_QUIRK_QUICK_WAKEUP  BIT(0)
0051 
0052 /* The main device structure */
0053 struct elan_tp_data {
0054     struct i2c_client   *client;
0055     struct input_dev    *input;
0056     struct input_dev    *tp_input; /* trackpoint input node */
0057     struct regulator    *vcc;
0058 
0059     const struct elan_transport_ops *ops;
0060 
0061     /* for fw update */
0062     struct completion   fw_completion;
0063     bool            in_fw_update;
0064 
0065     struct mutex        sysfs_mutex;
0066 
0067     unsigned int        max_x;
0068     unsigned int        max_y;
0069     unsigned int        width_x;
0070     unsigned int        width_y;
0071     unsigned int        x_res;
0072     unsigned int        y_res;
0073 
0074     u8          pattern;
0075     u16         product_id;
0076     u8          fw_version;
0077     u8          sm_version;
0078     u8          iap_version;
0079     u16         fw_checksum;
0080     unsigned int        report_features;
0081     unsigned int        report_len;
0082     int         pressure_adjustment;
0083     u8          mode;
0084     u16         ic_type;
0085     u16         fw_validpage_count;
0086     u16         fw_page_size;
0087     u32         fw_signature_address;
0088 
0089     bool            irq_wake;
0090 
0091     u8          min_baseline;
0092     u8          max_baseline;
0093     bool            baseline_ready;
0094     u8          clickpad;
0095     bool            middle_button;
0096 
0097     u32         quirks;     /* Various quirks */
0098 };
0099 
0100 static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
0101 {
0102     static const struct {
0103         u16 ic_type;
0104         u16 product_id;
0105         u32 quirks;
0106     } elan_i2c_quirks[] = {
0107         { 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
0108         { 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
0109         { 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
0110         { 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
0111         { 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
0112     };
0113     u32 quirks = 0;
0114     int i;
0115 
0116     for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
0117         if (elan_i2c_quirks[i].ic_type == ic_type &&
0118             elan_i2c_quirks[i].product_id == product_id) {
0119             quirks = elan_i2c_quirks[i].quirks;
0120         }
0121     }
0122 
0123     if (ic_type >= 0x0D && product_id >= 0x123)
0124         quirks |= ETP_QUIRK_QUICK_WAKEUP;
0125 
0126     return quirks;
0127 }
0128 
0129 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
0130                u32 *signature_address, u16 *page_size)
0131 {
0132     switch (ic_type) {
0133     case 0x00:
0134     case 0x06:
0135     case 0x08:
0136         *validpage_count = 512;
0137         break;
0138     case 0x03:
0139     case 0x07:
0140     case 0x09:
0141     case 0x0A:
0142     case 0x0B:
0143     case 0x0C:
0144         *validpage_count = 768;
0145         break;
0146     case 0x0D:
0147         *validpage_count = 896;
0148         break;
0149     case 0x0E:
0150         *validpage_count = 640;
0151         break;
0152     case 0x10:
0153         *validpage_count = 1024;
0154         break;
0155     case 0x11:
0156         *validpage_count = 1280;
0157         break;
0158     case 0x13:
0159         *validpage_count = 2048;
0160         break;
0161     case 0x14:
0162     case 0x15:
0163         *validpage_count = 1024;
0164         break;
0165     default:
0166         /* unknown ic type clear value */
0167         *validpage_count = 0;
0168         *signature_address = 0;
0169         *page_size = 0;
0170         return -ENXIO;
0171     }
0172 
0173     *signature_address =
0174         (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
0175 
0176     if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
0177         *validpage_count /= 8;
0178         *page_size = ETP_FW_PAGE_SIZE_512;
0179     } else if (ic_type >= 0x0D && iap_version >= 1) {
0180         *validpage_count /= 2;
0181         *page_size = ETP_FW_PAGE_SIZE_128;
0182     } else {
0183         *page_size = ETP_FW_PAGE_SIZE;
0184     }
0185 
0186     return 0;
0187 }
0188 
0189 static int elan_set_power(struct elan_tp_data *data, bool on)
0190 {
0191     int repeat = ETP_RETRY_COUNT;
0192     int error;
0193 
0194     do {
0195         error = data->ops->power_control(data->client, on);
0196         if (error >= 0)
0197             return 0;
0198 
0199         msleep(30);
0200     } while (--repeat > 0);
0201 
0202     dev_err(&data->client->dev, "failed to set power %s: %d\n",
0203         on ? "on" : "off", error);
0204     return error;
0205 }
0206 
0207 static int elan_sleep(struct elan_tp_data *data)
0208 {
0209     int repeat = ETP_RETRY_COUNT;
0210     int error;
0211 
0212     do {
0213         error = data->ops->sleep_control(data->client, true);
0214         if (!error)
0215             return 0;
0216 
0217         msleep(30);
0218     } while (--repeat > 0);
0219 
0220     return error;
0221 }
0222 
0223 static int elan_query_product(struct elan_tp_data *data)
0224 {
0225     int error;
0226 
0227     error = data->ops->get_product_id(data->client, &data->product_id);
0228     if (error)
0229         return error;
0230 
0231     error = data->ops->get_pattern(data->client, &data->pattern);
0232     if (error)
0233         return error;
0234 
0235     error = data->ops->get_sm_version(data->client, data->pattern,
0236                       &data->ic_type, &data->sm_version,
0237                       &data->clickpad);
0238     if (error)
0239         return error;
0240 
0241     return 0;
0242 }
0243 
0244 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
0245 {
0246     if (data->ic_type == 0x0E) {
0247         switch (data->product_id) {
0248         case 0x05 ... 0x07:
0249         case 0x09:
0250         case 0x13:
0251             return true;
0252         }
0253     } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
0254         /* ASUS EeeBook X205TA */
0255         return true;
0256     }
0257 
0258     return false;
0259 }
0260 
0261 static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
0262 {
0263     struct i2c_client *client = data->client;
0264     bool woken_up = false;
0265     int error;
0266 
0267     if (!skip_reset) {
0268         error = data->ops->initialize(client);
0269         if (error) {
0270             dev_err(&client->dev, "device initialize failed: %d\n", error);
0271             return error;
0272         }
0273     }
0274 
0275     error = elan_query_product(data);
0276     if (error)
0277         return error;
0278 
0279     /*
0280      * Some ASUS devices were shipped with firmware that requires
0281      * touchpads to be woken up first, before attempting to switch
0282      * them into absolute reporting mode.
0283      */
0284     if (elan_check_ASUS_special_fw(data)) {
0285         error = data->ops->sleep_control(client, false);
0286         if (error) {
0287             dev_err(&client->dev,
0288                 "failed to wake device up: %d\n", error);
0289             return error;
0290         }
0291 
0292         msleep(200);
0293         woken_up = true;
0294     }
0295 
0296     data->mode |= ETP_ENABLE_ABS;
0297     error = data->ops->set_mode(client, data->mode);
0298     if (error) {
0299         dev_err(&client->dev,
0300             "failed to switch to absolute mode: %d\n", error);
0301         return error;
0302     }
0303 
0304     if (!woken_up) {
0305         error = data->ops->sleep_control(client, false);
0306         if (error) {
0307             dev_err(&client->dev,
0308                 "failed to wake device up: %d\n", error);
0309             return error;
0310         }
0311     }
0312 
0313     return 0;
0314 }
0315 
0316 static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
0317 {
0318     int repeat = ETP_RETRY_COUNT;
0319     int error;
0320 
0321     do {
0322         error = __elan_initialize(data, skip_reset);
0323         if (!error)
0324             return 0;
0325 
0326         skip_reset = false;
0327         msleep(30);
0328     } while (--repeat > 0);
0329 
0330     return error;
0331 }
0332 
0333 static int elan_query_device_info(struct elan_tp_data *data)
0334 {
0335     int error;
0336 
0337     error = data->ops->get_version(data->client, data->pattern, false,
0338                        &data->fw_version);
0339     if (error)
0340         return error;
0341 
0342     error = data->ops->get_checksum(data->client, false,
0343                     &data->fw_checksum);
0344     if (error)
0345         return error;
0346 
0347     error = data->ops->get_version(data->client, data->pattern,
0348                        true, &data->iap_version);
0349     if (error)
0350         return error;
0351 
0352     error = data->ops->get_pressure_adjustment(data->client,
0353                            &data->pressure_adjustment);
0354     if (error)
0355         return error;
0356 
0357     error = data->ops->get_report_features(data->client, data->pattern,
0358                            &data->report_features,
0359                            &data->report_len);
0360     if (error)
0361         return error;
0362 
0363     data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
0364 
0365     error = elan_get_fwinfo(data->ic_type, data->iap_version,
0366                 &data->fw_validpage_count,
0367                 &data->fw_signature_address,
0368                 &data->fw_page_size);
0369     if (error)
0370         dev_warn(&data->client->dev,
0371              "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
0372              data->iap_version, data->ic_type);
0373 
0374     return 0;
0375 }
0376 
0377 static unsigned int elan_convert_resolution(u8 val, u8 pattern)
0378 {
0379     /*
0380      * pattern <= 0x01:
0381      *  (value from firmware) * 10 + 790 = dpi
0382      * else
0383      *  ((value from firmware) + 3) * 100 = dpi
0384      */
0385     int res = pattern <= 0x01 ?
0386         (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
0387     /*
0388      * We also have to convert dpi to dots/mm (*10/254 to avoid floating
0389      * point).
0390      */
0391     return res * 10 / 254;
0392 }
0393 
0394 static int elan_query_device_parameters(struct elan_tp_data *data)
0395 {
0396     struct i2c_client *client = data->client;
0397     unsigned int x_traces, y_traces;
0398     u32 x_mm, y_mm;
0399     u8 hw_x_res, hw_y_res;
0400     int error;
0401 
0402     if (device_property_read_u32(&client->dev,
0403                      "touchscreen-size-x", &data->max_x) ||
0404         device_property_read_u32(&client->dev,
0405                      "touchscreen-size-y", &data->max_y)) {
0406         error = data->ops->get_max(data->client,
0407                        &data->max_x,
0408                        &data->max_y);
0409         if (error)
0410             return error;
0411     } else {
0412         /* size is the maximum + 1 */
0413         --data->max_x;
0414         --data->max_y;
0415     }
0416 
0417     if (device_property_read_u32(&client->dev,
0418                      "elan,x_traces",
0419                      &x_traces) ||
0420         device_property_read_u32(&client->dev,
0421                      "elan,y_traces",
0422                      &y_traces)) {
0423         error = data->ops->get_num_traces(data->client,
0424                           &x_traces, &y_traces);
0425         if (error)
0426             return error;
0427     }
0428     data->width_x = data->max_x / x_traces;
0429     data->width_y = data->max_y / y_traces;
0430 
0431     if (device_property_read_u32(&client->dev,
0432                      "touchscreen-x-mm", &x_mm) ||
0433         device_property_read_u32(&client->dev,
0434                      "touchscreen-y-mm", &y_mm)) {
0435         error = data->ops->get_resolution(data->client,
0436                           &hw_x_res, &hw_y_res);
0437         if (error)
0438             return error;
0439 
0440         data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
0441         data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
0442     } else {
0443         data->x_res = (data->max_x + 1) / x_mm;
0444         data->y_res = (data->max_y + 1) / y_mm;
0445     }
0446 
0447     if (device_property_read_bool(&client->dev, "elan,clickpad"))
0448         data->clickpad = 1;
0449 
0450     if (device_property_read_bool(&client->dev, "elan,middle-button"))
0451         data->middle_button = true;
0452 
0453     return 0;
0454 }
0455 
0456 /*
0457  **********************************************************
0458  * IAP firmware updater related routines
0459  **********************************************************
0460  */
0461 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
0462                    const u8 *page, u16 checksum, int idx)
0463 {
0464     int retry = ETP_RETRY_COUNT;
0465     int error;
0466 
0467     do {
0468         error = data->ops->write_fw_block(data->client, page_size,
0469                           page, checksum, idx);
0470         if (!error)
0471             return 0;
0472 
0473         dev_dbg(&data->client->dev,
0474             "IAP retrying page %d (error: %d)\n", idx, error);
0475     } while (--retry > 0);
0476 
0477     return error;
0478 }
0479 
0480 static int __elan_update_firmware(struct elan_tp_data *data,
0481                   const struct firmware *fw)
0482 {
0483     struct i2c_client *client = data->client;
0484     struct device *dev = &client->dev;
0485     int i, j;
0486     int error;
0487     u16 iap_start_addr;
0488     u16 boot_page_count;
0489     u16 sw_checksum = 0, fw_checksum = 0;
0490 
0491     error = data->ops->prepare_fw_update(client, data->ic_type,
0492                          data->iap_version,
0493                          data->fw_page_size);
0494     if (error)
0495         return error;
0496 
0497     iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
0498 
0499     boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
0500     for (i = boot_page_count; i < data->fw_validpage_count; i++) {
0501         u16 checksum = 0;
0502         const u8 *page = &fw->data[i * data->fw_page_size];
0503 
0504         for (j = 0; j < data->fw_page_size; j += 2)
0505             checksum += ((page[j + 1] << 8) | page[j]);
0506 
0507         error = elan_write_fw_block(data, data->fw_page_size,
0508                         page, checksum, i);
0509         if (error) {
0510             dev_err(dev, "write page %d fail: %d\n", i, error);
0511             return error;
0512         }
0513 
0514         sw_checksum += checksum;
0515     }
0516 
0517     /* Wait WDT reset and power on reset */
0518     msleep(600);
0519 
0520     error = data->ops->finish_fw_update(client, &data->fw_completion);
0521     if (error)
0522         return error;
0523 
0524     error = data->ops->get_checksum(client, true, &fw_checksum);
0525     if (error)
0526         return error;
0527 
0528     if (sw_checksum != fw_checksum) {
0529         dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
0530             sw_checksum, fw_checksum);
0531         return -EIO;
0532     }
0533 
0534     return 0;
0535 }
0536 
0537 static int elan_update_firmware(struct elan_tp_data *data,
0538                 const struct firmware *fw)
0539 {
0540     struct i2c_client *client = data->client;
0541     int retval;
0542 
0543     dev_dbg(&client->dev, "Starting firmware update....\n");
0544 
0545     disable_irq(client->irq);
0546     data->in_fw_update = true;
0547 
0548     retval = __elan_update_firmware(data, fw);
0549     if (retval) {
0550         dev_err(&client->dev, "firmware update failed: %d\n", retval);
0551         data->ops->iap_reset(client);
0552     } else {
0553         /* Reinitialize TP after fw is updated */
0554         elan_initialize(data, false);
0555         elan_query_device_info(data);
0556     }
0557 
0558     data->in_fw_update = false;
0559     enable_irq(client->irq);
0560 
0561     return retval;
0562 }
0563 
0564 /*
0565  *******************************************************************
0566  * SYSFS attributes
0567  *******************************************************************
0568  */
0569 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
0570                        struct device_attribute *attr,
0571                        char *buf)
0572 {
0573     struct i2c_client *client = to_i2c_client(dev);
0574     struct elan_tp_data *data = i2c_get_clientdata(client);
0575 
0576     return sprintf(buf, "0x%04x\n", data->fw_checksum);
0577 }
0578 
0579 static ssize_t elan_sysfs_read_product_id(struct device *dev,
0580                      struct device_attribute *attr,
0581                      char *buf)
0582 {
0583     struct i2c_client *client = to_i2c_client(dev);
0584     struct elan_tp_data *data = i2c_get_clientdata(client);
0585 
0586     return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
0587                data->product_id);
0588 }
0589 
0590 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
0591                       struct device_attribute *attr,
0592                       char *buf)
0593 {
0594     struct i2c_client *client = to_i2c_client(dev);
0595     struct elan_tp_data *data = i2c_get_clientdata(client);
0596 
0597     return sprintf(buf, "%d.0\n", data->fw_version);
0598 }
0599 
0600 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
0601                       struct device_attribute *attr,
0602                       char *buf)
0603 {
0604     struct i2c_client *client = to_i2c_client(dev);
0605     struct elan_tp_data *data = i2c_get_clientdata(client);
0606 
0607     return sprintf(buf, "%d.0\n", data->sm_version);
0608 }
0609 
0610 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
0611                        struct device_attribute *attr,
0612                        char *buf)
0613 {
0614     struct i2c_client *client = to_i2c_client(dev);
0615     struct elan_tp_data *data = i2c_get_clientdata(client);
0616 
0617     return sprintf(buf, "%d.0\n", data->iap_version);
0618 }
0619 
0620 static ssize_t elan_sysfs_update_fw(struct device *dev,
0621                     struct device_attribute *attr,
0622                     const char *buf, size_t count)
0623 {
0624     struct elan_tp_data *data = dev_get_drvdata(dev);
0625     const struct firmware *fw;
0626     char *fw_name;
0627     int error;
0628     const u8 *fw_signature;
0629     static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
0630 
0631     if (data->fw_validpage_count == 0)
0632         return -EINVAL;
0633 
0634     /* Look for a firmware with the product id appended. */
0635     fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
0636     if (!fw_name) {
0637         dev_err(dev, "failed to allocate memory for firmware name\n");
0638         return -ENOMEM;
0639     }
0640 
0641     dev_info(dev, "requesting fw '%s'\n", fw_name);
0642     error = request_firmware(&fw, fw_name, dev);
0643     kfree(fw_name);
0644     if (error) {
0645         dev_err(dev, "failed to request firmware: %d\n", error);
0646         return error;
0647     }
0648 
0649     /* Firmware file must match signature data */
0650     fw_signature = &fw->data[data->fw_signature_address];
0651     if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
0652         dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
0653             (int)sizeof(signature), signature,
0654             (int)sizeof(signature), fw_signature);
0655         error = -EBADF;
0656         goto out_release_fw;
0657     }
0658 
0659     error = mutex_lock_interruptible(&data->sysfs_mutex);
0660     if (error)
0661         goto out_release_fw;
0662 
0663     error = elan_update_firmware(data, fw);
0664 
0665     mutex_unlock(&data->sysfs_mutex);
0666 
0667 out_release_fw:
0668     release_firmware(fw);
0669     return error ?: count;
0670 }
0671 
0672 static ssize_t calibrate_store(struct device *dev,
0673                    struct device_attribute *attr,
0674                    const char *buf, size_t count)
0675 {
0676     struct i2c_client *client = to_i2c_client(dev);
0677     struct elan_tp_data *data = i2c_get_clientdata(client);
0678     int tries = 20;
0679     int retval;
0680     int error;
0681     u8 val[ETP_CALIBRATE_MAX_LEN];
0682 
0683     retval = mutex_lock_interruptible(&data->sysfs_mutex);
0684     if (retval)
0685         return retval;
0686 
0687     disable_irq(client->irq);
0688 
0689     data->mode |= ETP_ENABLE_CALIBRATE;
0690     retval = data->ops->set_mode(client, data->mode);
0691     if (retval) {
0692         dev_err(dev, "failed to enable calibration mode: %d\n",
0693             retval);
0694         goto out;
0695     }
0696 
0697     retval = data->ops->calibrate(client);
0698     if (retval) {
0699         dev_err(dev, "failed to start calibration: %d\n",
0700             retval);
0701         goto out_disable_calibrate;
0702     }
0703 
0704     val[0] = 0xff;
0705     do {
0706         /* Wait 250ms before checking if calibration has completed. */
0707         msleep(250);
0708 
0709         retval = data->ops->calibrate_result(client, val);
0710         if (retval)
0711             dev_err(dev, "failed to check calibration result: %d\n",
0712                 retval);
0713         else if (val[0] == 0)
0714             break; /* calibration done */
0715 
0716     } while (--tries);
0717 
0718     if (tries == 0) {
0719         dev_err(dev, "failed to calibrate. Timeout.\n");
0720         retval = -ETIMEDOUT;
0721     }
0722 
0723 out_disable_calibrate:
0724     data->mode &= ~ETP_ENABLE_CALIBRATE;
0725     error = data->ops->set_mode(data->client, data->mode);
0726     if (error) {
0727         dev_err(dev, "failed to disable calibration mode: %d\n",
0728             error);
0729         if (!retval)
0730             retval = error;
0731     }
0732 out:
0733     enable_irq(client->irq);
0734     mutex_unlock(&data->sysfs_mutex);
0735     return retval ?: count;
0736 }
0737 
0738 static ssize_t elan_sysfs_read_mode(struct device *dev,
0739                     struct device_attribute *attr,
0740                     char *buf)
0741 {
0742     struct i2c_client *client = to_i2c_client(dev);
0743     struct elan_tp_data *data = i2c_get_clientdata(client);
0744     int error;
0745     enum tp_mode mode;
0746 
0747     error = mutex_lock_interruptible(&data->sysfs_mutex);
0748     if (error)
0749         return error;
0750 
0751     error = data->ops->iap_get_mode(data->client, &mode);
0752 
0753     mutex_unlock(&data->sysfs_mutex);
0754 
0755     if (error)
0756         return error;
0757 
0758     return sprintf(buf, "%d\n", (int)mode);
0759 }
0760 
0761 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
0762 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
0763 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
0764 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
0765 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
0766 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
0767 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
0768 
0769 static DEVICE_ATTR_WO(calibrate);
0770 
0771 static struct attribute *elan_sysfs_entries[] = {
0772     &dev_attr_product_id.attr,
0773     &dev_attr_firmware_version.attr,
0774     &dev_attr_sample_version.attr,
0775     &dev_attr_iap_version.attr,
0776     &dev_attr_fw_checksum.attr,
0777     &dev_attr_calibrate.attr,
0778     &dev_attr_mode.attr,
0779     &dev_attr_update_fw.attr,
0780     NULL,
0781 };
0782 
0783 static const struct attribute_group elan_sysfs_group = {
0784     .attrs = elan_sysfs_entries,
0785 };
0786 
0787 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
0788                  const char *buf, size_t count)
0789 {
0790     struct i2c_client *client = to_i2c_client(dev);
0791     struct elan_tp_data *data = i2c_get_clientdata(client);
0792     int error;
0793     int retval;
0794 
0795     retval = mutex_lock_interruptible(&data->sysfs_mutex);
0796     if (retval)
0797         return retval;
0798 
0799     disable_irq(client->irq);
0800 
0801     data->baseline_ready = false;
0802 
0803     data->mode |= ETP_ENABLE_CALIBRATE;
0804     retval = data->ops->set_mode(data->client, data->mode);
0805     if (retval) {
0806         dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
0807             retval);
0808         goto out;
0809     }
0810 
0811     msleep(250);
0812 
0813     retval = data->ops->get_baseline_data(data->client, true,
0814                           &data->max_baseline);
0815     if (retval) {
0816         dev_err(dev, "Failed to read max baseline form device: %d\n",
0817             retval);
0818         goto out_disable_calibrate;
0819     }
0820 
0821     retval = data->ops->get_baseline_data(data->client, false,
0822                           &data->min_baseline);
0823     if (retval) {
0824         dev_err(dev, "Failed to read min baseline form device: %d\n",
0825             retval);
0826         goto out_disable_calibrate;
0827     }
0828 
0829     data->baseline_ready = true;
0830 
0831 out_disable_calibrate:
0832     data->mode &= ~ETP_ENABLE_CALIBRATE;
0833     error = data->ops->set_mode(data->client, data->mode);
0834     if (error) {
0835         dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
0836             error);
0837         if (!retval)
0838             retval = error;
0839     }
0840 out:
0841     enable_irq(client->irq);
0842     mutex_unlock(&data->sysfs_mutex);
0843     return retval ?: count;
0844 }
0845 
0846 static ssize_t min_show(struct device *dev,
0847             struct device_attribute *attr, char *buf)
0848 {
0849     struct i2c_client *client = to_i2c_client(dev);
0850     struct elan_tp_data *data = i2c_get_clientdata(client);
0851     int retval;
0852 
0853     retval = mutex_lock_interruptible(&data->sysfs_mutex);
0854     if (retval)
0855         return retval;
0856 
0857     if (!data->baseline_ready) {
0858         retval = -ENODATA;
0859         goto out;
0860     }
0861 
0862     retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
0863 
0864 out:
0865     mutex_unlock(&data->sysfs_mutex);
0866     return retval;
0867 }
0868 
0869 static ssize_t max_show(struct device *dev,
0870             struct device_attribute *attr, char *buf)
0871 {
0872     struct i2c_client *client = to_i2c_client(dev);
0873     struct elan_tp_data *data = i2c_get_clientdata(client);
0874     int retval;
0875 
0876     retval = mutex_lock_interruptible(&data->sysfs_mutex);
0877     if (retval)
0878         return retval;
0879 
0880     if (!data->baseline_ready) {
0881         retval = -ENODATA;
0882         goto out;
0883     }
0884 
0885     retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
0886 
0887 out:
0888     mutex_unlock(&data->sysfs_mutex);
0889     return retval;
0890 }
0891 
0892 
0893 static DEVICE_ATTR_WO(acquire);
0894 static DEVICE_ATTR_RO(min);
0895 static DEVICE_ATTR_RO(max);
0896 
0897 static struct attribute *elan_baseline_sysfs_entries[] = {
0898     &dev_attr_acquire.attr,
0899     &dev_attr_min.attr,
0900     &dev_attr_max.attr,
0901     NULL,
0902 };
0903 
0904 static const struct attribute_group elan_baseline_sysfs_group = {
0905     .name = "baseline",
0906     .attrs = elan_baseline_sysfs_entries,
0907 };
0908 
0909 static const struct attribute_group *elan_sysfs_groups[] = {
0910     &elan_sysfs_group,
0911     &elan_baseline_sysfs_group,
0912     NULL
0913 };
0914 
0915 /*
0916  ******************************************************************
0917  * Elan isr functions
0918  ******************************************************************
0919  */
0920 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
0921                 bool contact_valid, bool high_precision,
0922                 u8 *packet, u8 *finger_data)
0923 {
0924     struct input_dev *input = data->input;
0925     unsigned int pos_x, pos_y;
0926     unsigned int pressure, scaled_pressure;
0927 
0928     if (contact_valid) {
0929         if (high_precision) {
0930             pos_x = get_unaligned_be16(&finger_data[0]);
0931             pos_y = get_unaligned_be16(&finger_data[2]);
0932         } else {
0933             pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
0934             pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
0935         }
0936 
0937         if (pos_x > data->max_x || pos_y > data->max_y) {
0938             dev_dbg(input->dev.parent,
0939                 "[%d] x=%d y=%d over max (%d, %d)",
0940                 contact_num, pos_x, pos_y,
0941                 data->max_x, data->max_y);
0942             return;
0943         }
0944 
0945         pressure = finger_data[4];
0946         scaled_pressure = pressure + data->pressure_adjustment;
0947         if (scaled_pressure > ETP_MAX_PRESSURE)
0948             scaled_pressure = ETP_MAX_PRESSURE;
0949 
0950         input_mt_slot(input, contact_num);
0951         input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
0952         input_report_abs(input, ABS_MT_POSITION_X, pos_x);
0953         input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
0954         input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
0955 
0956         if (data->report_features & ETP_FEATURE_REPORT_MK) {
0957             unsigned int mk_x, mk_y, area_x, area_y;
0958             u8 mk_data = high_precision ?
0959                 packet[ETP_MK_DATA_OFFSET + contact_num] :
0960                 finger_data[3];
0961 
0962             mk_x = mk_data & 0x0f;
0963             mk_y = mk_data >> 4;
0964 
0965             /*
0966              * To avoid treating large finger as palm, let's reduce
0967              * the width x and y per trace.
0968              */
0969             area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
0970             area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
0971 
0972             input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
0973             input_report_abs(input, ABS_MT_TOUCH_MAJOR,
0974                      max(area_x, area_y));
0975             input_report_abs(input, ABS_MT_TOUCH_MINOR,
0976                      min(area_x, area_y));
0977         }
0978     } else {
0979         input_mt_slot(input, contact_num);
0980         input_mt_report_slot_inactive(input);
0981     }
0982 }
0983 
0984 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
0985                  bool high_precision)
0986 {
0987     struct input_dev *input = data->input;
0988     u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
0989     int i;
0990     u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
0991     u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
0992     bool contact_valid, hover_event;
0993 
0994     pm_wakeup_event(&data->client->dev, 0);
0995 
0996     hover_event = hover_info & BIT(6);
0997 
0998     for (i = 0; i < ETP_MAX_FINGERS; i++) {
0999         contact_valid = tp_info & BIT(3 + i);
1000         elan_report_contact(data, i, contact_valid, high_precision,
1001                     packet, finger_data);
1002         if (contact_valid)
1003             finger_data += ETP_FINGER_DATA_LEN;
1004     }
1005 
1006     input_report_key(input, BTN_LEFT,   tp_info & BIT(0));
1007     input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1008     input_report_key(input, BTN_RIGHT,  tp_info & BIT(1));
1009     input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1010     input_mt_report_pointer_emulation(input, true);
1011     input_sync(input);
1012 }
1013 
1014 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1015 {
1016     struct input_dev *input = data->tp_input;
1017     u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1018     int x, y;
1019 
1020     pm_wakeup_event(&data->client->dev, 0);
1021 
1022     if (!data->tp_input) {
1023         dev_warn_once(&data->client->dev,
1024                   "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1025         return;
1026     }
1027 
1028     input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1029     input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1030     input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1031 
1032     if ((packet[3] & 0x0F) == 0x06) {
1033         x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1034         y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1035 
1036         input_report_rel(input, REL_X, x);
1037         input_report_rel(input, REL_Y, y);
1038     }
1039 
1040     input_sync(input);
1041 }
1042 
1043 static irqreturn_t elan_isr(int irq, void *dev_id)
1044 {
1045     struct elan_tp_data *data = dev_id;
1046     int error;
1047     u8 report[ETP_MAX_REPORT_LEN];
1048 
1049     /*
1050      * When device is connected to i2c bus, when all IAP page writes
1051      * complete, the driver will receive interrupt and must read
1052      * 0000 to confirm that IAP is finished.
1053     */
1054     if (data->in_fw_update) {
1055         complete(&data->fw_completion);
1056         goto out;
1057     }
1058 
1059     error = data->ops->get_report(data->client, report, data->report_len);
1060     if (error)
1061         goto out;
1062 
1063     switch (report[ETP_REPORT_ID_OFFSET]) {
1064     case ETP_REPORT_ID:
1065         elan_report_absolute(data, report, false);
1066         break;
1067     case ETP_REPORT_ID2:
1068         elan_report_absolute(data, report, true);
1069         break;
1070     case ETP_TP_REPORT_ID:
1071     case ETP_TP_REPORT_ID2:
1072         elan_report_trackpoint(data, report);
1073         break;
1074     default:
1075         dev_err(&data->client->dev, "invalid report id data (%x)\n",
1076             report[ETP_REPORT_ID_OFFSET]);
1077     }
1078 
1079 out:
1080     return IRQ_HANDLED;
1081 }
1082 
1083 /*
1084  ******************************************************************
1085  * Elan initialization functions
1086  ******************************************************************
1087  */
1088 
1089 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1090 {
1091     struct device *dev = &data->client->dev;
1092     struct input_dev *input;
1093 
1094     input = devm_input_allocate_device(dev);
1095     if (!input)
1096         return -ENOMEM;
1097 
1098     input->name = "Elan TrackPoint";
1099     input->id.bustype = BUS_I2C;
1100     input->id.vendor = ELAN_VENDOR_ID;
1101     input->id.product = data->product_id;
1102     input_set_drvdata(input, data);
1103 
1104     input_set_capability(input, EV_REL, REL_X);
1105     input_set_capability(input, EV_REL, REL_Y);
1106     input_set_capability(input, EV_KEY, BTN_LEFT);
1107     input_set_capability(input, EV_KEY, BTN_RIGHT);
1108     input_set_capability(input, EV_KEY, BTN_MIDDLE);
1109 
1110     __set_bit(INPUT_PROP_POINTER, input->propbit);
1111     __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1112 
1113     data->tp_input = input;
1114 
1115     return 0;
1116 }
1117 
1118 static int elan_setup_input_device(struct elan_tp_data *data)
1119 {
1120     struct device *dev = &data->client->dev;
1121     struct input_dev *input;
1122     unsigned int max_width = max(data->width_x, data->width_y);
1123     unsigned int min_width = min(data->width_x, data->width_y);
1124     int error;
1125 
1126     input = devm_input_allocate_device(dev);
1127     if (!input)
1128         return -ENOMEM;
1129 
1130     input->name = "Elan Touchpad";
1131     input->id.bustype = BUS_I2C;
1132     input->id.vendor = ELAN_VENDOR_ID;
1133     input->id.product = data->product_id;
1134     input_set_drvdata(input, data);
1135 
1136     error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1137                     INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1138     if (error) {
1139         dev_err(dev, "failed to initialize MT slots: %d\n", error);
1140         return error;
1141     }
1142 
1143     __set_bit(EV_ABS, input->evbit);
1144     __set_bit(INPUT_PROP_POINTER, input->propbit);
1145     if (data->clickpad) {
1146         __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1147     } else {
1148         __set_bit(BTN_RIGHT, input->keybit);
1149         if (data->middle_button)
1150             __set_bit(BTN_MIDDLE, input->keybit);
1151     }
1152     __set_bit(BTN_LEFT, input->keybit);
1153 
1154     /* Set up ST parameters */
1155     input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1156     input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1157     input_abs_set_res(input, ABS_X, data->x_res);
1158     input_abs_set_res(input, ABS_Y, data->y_res);
1159     input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1160     if (data->report_features & ETP_FEATURE_REPORT_MK)
1161         input_set_abs_params(input, ABS_TOOL_WIDTH,
1162                      0, ETP_FINGER_WIDTH, 0, 0);
1163     input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1164 
1165     /* And MT parameters */
1166     input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1167     input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1168     input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1169     input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1170     input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1171                  ETP_MAX_PRESSURE, 0, 0);
1172     if (data->report_features & ETP_FEATURE_REPORT_MK) {
1173         input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1174                      0, ETP_FINGER_WIDTH * max_width, 0, 0);
1175         input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1176                      0, ETP_FINGER_WIDTH * min_width, 0, 0);
1177     }
1178 
1179     data->input = input;
1180 
1181     return 0;
1182 }
1183 
1184 static void elan_disable_regulator(void *_data)
1185 {
1186     struct elan_tp_data *data = _data;
1187 
1188     regulator_disable(data->vcc);
1189 }
1190 
1191 static int elan_probe(struct i2c_client *client,
1192               const struct i2c_device_id *dev_id)
1193 {
1194     const struct elan_transport_ops *transport_ops;
1195     struct device *dev = &client->dev;
1196     struct elan_tp_data *data;
1197     unsigned long irqflags;
1198     int error;
1199 
1200     if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1201         i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1202         transport_ops = &elan_i2c_ops;
1203     } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1204            i2c_check_functionality(client->adapter,
1205                        I2C_FUNC_SMBUS_BYTE_DATA |
1206                         I2C_FUNC_SMBUS_BLOCK_DATA |
1207                         I2C_FUNC_SMBUS_I2C_BLOCK)) {
1208         transport_ops = &elan_smbus_ops;
1209     } else {
1210         dev_err(dev, "not a supported I2C/SMBus adapter\n");
1211         return -EIO;
1212     }
1213 
1214     data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1215     if (!data)
1216         return -ENOMEM;
1217 
1218     i2c_set_clientdata(client, data);
1219 
1220     data->ops = transport_ops;
1221     data->client = client;
1222     init_completion(&data->fw_completion);
1223     mutex_init(&data->sysfs_mutex);
1224 
1225     data->vcc = devm_regulator_get(dev, "vcc");
1226     if (IS_ERR(data->vcc)) {
1227         error = PTR_ERR(data->vcc);
1228         if (error != -EPROBE_DEFER)
1229             dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1230                 error);
1231         return error;
1232     }
1233 
1234     error = regulator_enable(data->vcc);
1235     if (error) {
1236         dev_err(dev, "Failed to enable regulator: %d\n", error);
1237         return error;
1238     }
1239 
1240     error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1241     if (error) {
1242         dev_err(dev, "Failed to add disable regulator action: %d\n",
1243             error);
1244         return error;
1245     }
1246 
1247     /* Make sure there is something at this address */
1248     error = i2c_smbus_read_byte(client);
1249     if (error < 0) {
1250         dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1251         return -ENXIO;
1252     }
1253 
1254     /* Initialize the touchpad. */
1255     error = elan_initialize(data, false);
1256     if (error)
1257         return error;
1258 
1259     error = elan_query_device_info(data);
1260     if (error)
1261         return error;
1262 
1263     error = elan_query_device_parameters(data);
1264     if (error)
1265         return error;
1266 
1267     dev_info(dev,
1268          "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1269          data->product_id,
1270          data->fw_version,
1271          data->sm_version,
1272          data->iap_version);
1273 
1274     dev_dbg(dev,
1275         "Elan Touchpad Extra Information:\n"
1276         "    Max ABS X,Y:   %d,%d\n"
1277         "    Width X,Y:   %d,%d\n"
1278         "    Resolution X,Y:   %d,%d (dots/mm)\n"
1279         "    ic type: 0x%x\n"
1280         "    info pattern: 0x%x\n",
1281         data->max_x, data->max_y,
1282         data->width_x, data->width_y,
1283         data->x_res, data->y_res,
1284         data->ic_type, data->pattern);
1285 
1286     /* Set up input device properties based on queried parameters. */
1287     error = elan_setup_input_device(data);
1288     if (error)
1289         return error;
1290 
1291     if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1292         error = elan_setup_trackpoint_input_device(data);
1293         if (error)
1294             return error;
1295     }
1296 
1297     /*
1298      * Platform code (ACPI, DTS) should normally set up interrupt
1299      * for us, but in case it did not let's fall back to using falling
1300      * edge to be compatible with older Chromebooks.
1301      */
1302     irqflags = irq_get_trigger_type(client->irq);
1303     if (!irqflags)
1304         irqflags = IRQF_TRIGGER_FALLING;
1305 
1306     error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1307                       irqflags | IRQF_ONESHOT,
1308                       client->name, data);
1309     if (error) {
1310         dev_err(dev, "cannot register irq=%d\n", client->irq);
1311         return error;
1312     }
1313 
1314     error = devm_device_add_groups(dev, elan_sysfs_groups);
1315     if (error) {
1316         dev_err(dev, "failed to create sysfs attributes: %d\n", error);
1317         return error;
1318     }
1319 
1320     error = input_register_device(data->input);
1321     if (error) {
1322         dev_err(dev, "failed to register input device: %d\n", error);
1323         return error;
1324     }
1325 
1326     if (data->tp_input) {
1327         error = input_register_device(data->tp_input);
1328         if (error) {
1329             dev_err(&client->dev,
1330                 "failed to register TrackPoint input device: %d\n",
1331                 error);
1332             return error;
1333         }
1334     }
1335 
1336     /*
1337      * Systems using device tree should set up wakeup via DTS,
1338      * the rest will configure device as wakeup source by default.
1339      */
1340     if (!dev->of_node)
1341         device_init_wakeup(dev, true);
1342 
1343     return 0;
1344 }
1345 
1346 static int __maybe_unused elan_suspend(struct device *dev)
1347 {
1348     struct i2c_client *client = to_i2c_client(dev);
1349     struct elan_tp_data *data = i2c_get_clientdata(client);
1350     int ret;
1351 
1352     /*
1353      * We are taking the mutex to make sure sysfs operations are
1354      * complete before we attempt to bring the device into low[er]
1355      * power mode.
1356      */
1357     ret = mutex_lock_interruptible(&data->sysfs_mutex);
1358     if (ret)
1359         return ret;
1360 
1361     disable_irq(client->irq);
1362 
1363     if (device_may_wakeup(dev)) {
1364         ret = elan_sleep(data);
1365         /* Enable wake from IRQ */
1366         data->irq_wake = (enable_irq_wake(client->irq) == 0);
1367     } else {
1368         ret = elan_set_power(data, false);
1369         if (ret)
1370             goto err;
1371 
1372         ret = regulator_disable(data->vcc);
1373         if (ret) {
1374             dev_err(dev, "error %d disabling regulator\n", ret);
1375             /* Attempt to power the chip back up */
1376             elan_set_power(data, true);
1377         }
1378     }
1379 
1380 err:
1381     mutex_unlock(&data->sysfs_mutex);
1382     return ret;
1383 }
1384 
1385 static int __maybe_unused elan_resume(struct device *dev)
1386 {
1387     struct i2c_client *client = to_i2c_client(dev);
1388     struct elan_tp_data *data = i2c_get_clientdata(client);
1389     int error;
1390 
1391     if (!device_may_wakeup(dev)) {
1392         error = regulator_enable(data->vcc);
1393         if (error) {
1394             dev_err(dev, "error %d enabling regulator\n", error);
1395             goto err;
1396         }
1397     } else if (data->irq_wake) {
1398         disable_irq_wake(client->irq);
1399         data->irq_wake = false;
1400     }
1401 
1402     error = elan_set_power(data, true);
1403     if (error) {
1404         dev_err(dev, "power up when resuming failed: %d\n", error);
1405         goto err;
1406     }
1407 
1408     error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1409     if (error)
1410         dev_err(dev, "initialize when resuming failed: %d\n", error);
1411 
1412 err:
1413     enable_irq(data->client->irq);
1414     return error;
1415 }
1416 
1417 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1418 
1419 static const struct i2c_device_id elan_id[] = {
1420     { DRIVER_NAME, 0 },
1421     { },
1422 };
1423 MODULE_DEVICE_TABLE(i2c, elan_id);
1424 
1425 #ifdef CONFIG_ACPI
1426 #include <linux/input/elan-i2c-ids.h>
1427 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1428 #endif
1429 
1430 #ifdef CONFIG_OF
1431 static const struct of_device_id elan_of_match[] = {
1432     { .compatible = "elan,ekth3000" },
1433     { /* sentinel */ }
1434 };
1435 MODULE_DEVICE_TABLE(of, elan_of_match);
1436 #endif
1437 
1438 static struct i2c_driver elan_driver = {
1439     .driver = {
1440         .name   = DRIVER_NAME,
1441         .pm = &elan_pm_ops,
1442         .acpi_match_table = ACPI_PTR(elan_acpi_id),
1443         .of_match_table = of_match_ptr(elan_of_match),
1444         .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1445     },
1446     .probe      = elan_probe,
1447     .id_table   = elan_id,
1448 };
1449 
1450 module_i2c_driver(elan_driver);
1451 
1452 MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1453 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1454 MODULE_LICENSE("GPL");
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