drivers/input/mouse/elan_i2c_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Elan I2C/SMBus Touchpad driver
   4  *
   5  * Copyright (c) 2013 ELAN Microelectronics Corp.
   6  *
   7  * Author: 林政維 (Duson Lin) <[email protected]>
   8  * Author: KT Liao <[email protected]>
   9  * Version: 1.6.3
  10  *
  11  * Based on cyapa driver:
  12  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  13  * copyright (c) 2011-2012 Google, Inc.
  14  *
  15  * Trademarks are the property of their respective owners.
  16  */
  17
  18 #include <linux/acpi.h>
  19 #include <linux/delay.h>
  20 #include <linux/device.h>
  21 #include <linux/firmware.h>
  22 #include <linux/i2c.h>
  23 #include <linux/init.h>
  24 #include <linux/input/mt.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/irq.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/kernel.h>
  30 #include <linux/sched.h>
  31 #include <linux/input.h>
  32 #include <linux/uaccess.h>
  33 #include <linux/jiffies.h>
  34 #include <linux/completion.h>
  35 #include <linux/of.h>
  36 #include <linux/pm_wakeirq.h>
  37 #include <linux/property.h>
  38 #include <linux/regulator/consumer.h>
  39 #include <asm/unaligned.h>
  40
  41 #include "elan_i2c.h"
  42
  43 #define DRIVER_NAME             "elan_i2c"
  44 #define ELAN_VENDOR_ID          0x04f3
  45 #define ETP_MAX_PRESSURE        255
  46 #define ETP_FWIDTH_REDUCE       90
  47 #define ETP_FINGER_WIDTH        15
  48 #define ETP_RETRY_COUNT         3
  49
  50 /* quirks to control the device */
  51 #define ETP_QUIRK_QUICK_WAKEUP  BIT(0)
  52
  53 /* The main device structure */
  54 struct elan_tp_data {
  55         struct i2c_client       *client;
  56         struct input_dev        *input;
  57         struct input_dev        *tp_input; /* trackpoint input node */
  58         struct regulator        *vcc;
  59
  60         const struct elan_transport_ops *ops;
  61
  62         /* for fw update */
  63         struct completion       fw_completion;
  64         bool                    in_fw_update;
  65
  66         struct mutex            sysfs_mutex;
  67
  68         unsigned int            max_x;
  69         unsigned int            max_y;
  70         unsigned int            width_x;
  71         unsigned int            width_y;
  72         unsigned int            x_res;
  73         unsigned int            y_res;
  74
  75         u8                      pattern;
  76         u16                     product_id;
  77         u8                      fw_version;
  78         u8                      sm_version;
  79         u8                      iap_version;
  80         u16                     fw_checksum;
  81         unsigned int            report_features;
  82         unsigned int            report_len;
  83         int                     pressure_adjustment;
  84         u8                      mode;
  85         u16                     ic_type;
  86         u16                     fw_validpage_count;
  87         u16                     fw_page_size;
  88         u32                     fw_signature_address;
  89
  90         u8                      min_baseline;
  91         u8                      max_baseline;
  92         bool                    baseline_ready;
  93         u8                      clickpad;
  94         bool                    middle_button;
  95
  96         u32                     quirks;         /* Various quirks */
  97 };
  98
  99 static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
 100 {
 101         static const struct {
 102                 u16 ic_type;
 103                 u16 product_id;
 104                 u32 quirks;
 105         } elan_i2c_quirks[] = {
 106                 { 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
 107                 { 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
 108                 { 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
 109                 { 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
 110                 { 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
 111         };
 112         u32 quirks = 0;
 113         int i;
 114
 115         for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
 116                 if (elan_i2c_quirks[i].ic_type == ic_type &&
 117                     elan_i2c_quirks[i].product_id == product_id) {
 118                         quirks = elan_i2c_quirks[i].quirks;
 119                 }
 120         }
 121
 122         if (ic_type >= 0x0D && product_id >= 0x123)
 123                 quirks |= ETP_QUIRK_QUICK_WAKEUP;
 124
 125         return quirks;
 126 }
 127
 128 static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
 129                            u32 *signature_address, u16 *page_size)
 130 {
 131         switch (ic_type) {
 132         case 0x00:
 133         case 0x06:
 134         case 0x08:
 135                 *validpage_count = 512;
 136                 break;
 137         case 0x03:
 138         case 0x07:
 139         case 0x09:
 140         case 0x0A:
 141         case 0x0B:
 142         case 0x0C:
 143                 *validpage_count = 768;
 144                 break;
 145         case 0x0D:
 146                 *validpage_count = 896;
 147                 break;
 148         case 0x0E:
 149                 *validpage_count = 640;
 150                 break;
 151         case 0x10:
 152                 *validpage_count = 1024;
 153                 break;
 154         case 0x11:
 155                 *validpage_count = 1280;
 156                 break;
 157         case 0x13:
 158                 *validpage_count = 2048;
 159                 break;
 160         case 0x14:
 161         case 0x15:
 162                 *validpage_count = 1024;
 163                 break;
 164         default:
 165                 /* unknown ic type clear value */
 166                 *validpage_count = 0;
 167                 *signature_address = 0;
 168                 *page_size = 0;
 169                 return -ENXIO;
 170         }
 171
 172         *signature_address =
 173                 (*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
 174
 175         if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
 176                 *validpage_count /= 8;
 177                 *page_size = ETP_FW_PAGE_SIZE_512;
 178         } else if (ic_type >= 0x0D && iap_version >= 1) {
 179                 *validpage_count /= 2;
 180                 *page_size = ETP_FW_PAGE_SIZE_128;
 181         } else {
 182                 *page_size = ETP_FW_PAGE_SIZE;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int elan_set_power(struct elan_tp_data *data, bool on)
 189 {
 190         int repeat = ETP_RETRY_COUNT;
 191         int error;
 192
 193         do {
 194                 error = data->ops->power_control(data->client, on);
 195                 if (error >= 0)
 196                         return 0;
 197
 198                 msleep(30);
 199         } while (--repeat > 0);
 200
 201         dev_err(&data->client->dev, "failed to set power %s: %d\n",
 202                 on ? "on" : "off", error);
 203         return error;
 204 }
 205
 206 static int elan_sleep(struct elan_tp_data *data)
 207 {
 208         int repeat = ETP_RETRY_COUNT;
 209         int error;
 210
 211         do {
 212                 error = data->ops->sleep_control(data->client, true);
 213                 if (!error)
 214                         return 0;
 215
 216                 msleep(30);
 217         } while (--repeat > 0);
 218
 219         return error;
 220 }
 221
 222 static int elan_query_product(struct elan_tp_data *data)
 223 {
 224         int error;
 225
 226         error = data->ops->get_product_id(data->client, &data->product_id);
 227         if (error)
 228                 return error;
 229
 230         error = data->ops->get_pattern(data->client, &data->pattern);
 231         if (error)
 232                 return error;
 233
 234         error = data->ops->get_sm_version(data->client, data->pattern,
 235                                           &data->ic_type, &data->sm_version,
 236                                           &data->clickpad);
 237         if (error)
 238                 return error;
 239
 240         return 0;
 241 }
 242
 243 static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
 244 {
 245         if (data->ic_type == 0x0E) {
 246                 switch (data->product_id) {
 247                 case 0x05 ... 0x07:
 248                 case 0x09:
 249                 case 0x13:
 250                         return true;
 251                 }
 252         } else if (data->ic_type == 0x08 && data->product_id == 0x26) {
 253                 /* ASUS EeeBook X205TA */
 254                 return true;
 255         }
 256
 257         return false;
 258 }
 259
 260 static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
 261 {
 262         struct i2c_client *client = data->client;
 263         bool woken_up = false;
 264         int error;
 265
 266         if (!skip_reset) {
 267                 error = data->ops->initialize(client);
 268                 if (error) {
 269                         dev_err(&client->dev, "device initialize failed: %d\n", error);
 270                         return error;
 271                 }
 272         }
 273
 274         error = elan_query_product(data);
 275         if (error)
 276                 return error;
 277
 278         /*
 279          * Some ASUS devices were shipped with firmware that requires
 280          * touchpads to be woken up first, before attempting to switch
 281          * them into absolute reporting mode.
 282          */
 283         if (elan_check_ASUS_special_fw(data)) {
 284                 error = data->ops->sleep_control(client, false);
 285                 if (error) {
 286                         dev_err(&client->dev,
 287                                 "failed to wake device up: %d\n", error);
 288                         return error;
 289                 }
 290
 291                 msleep(200);
 292                 woken_up = true;
 293         }
 294
 295         data->mode |= ETP_ENABLE_ABS;
 296         error = data->ops->set_mode(client, data->mode);
 297         if (error) {
 298                 dev_err(&client->dev,
 299                         "failed to switch to absolute mode: %d\n", error);
 300                 return error;
 301         }
 302
 303         if (!woken_up) {
 304                 error = data->ops->sleep_control(client, false);
 305                 if (error) {
 306                         dev_err(&client->dev,
 307                                 "failed to wake device up: %d\n", error);
 308                         return error;
 309                 }
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
 316 {
 317         int repeat = ETP_RETRY_COUNT;
 318         int error;
 319
 320         do {
 321                 error = __elan_initialize(data, skip_reset);
 322                 if (!error)
 323                         return 0;
 324
 325                 skip_reset = false;
 326                 msleep(30);
 327         } while (--repeat > 0);
 328
 329         return error;
 330 }
 331
 332 static int elan_query_device_info(struct elan_tp_data *data)
 333 {
 334         int error;
 335
 336         error = data->ops->get_version(data->client, data->pattern, false,
 337                                        &data->fw_version);
 338         if (error)
 339                 return error;
 340
 341         error = data->ops->get_checksum(data->client, false,
 342                                         &data->fw_checksum);
 343         if (error)
 344                 return error;
 345
 346         error = data->ops->get_version(data->client, data->pattern,
 347                                        true, &data->iap_version);
 348         if (error)
 349                 return error;
 350
 351         error = data->ops->get_pressure_adjustment(data->client,
 352                                                    &data->pressure_adjustment);
 353         if (error)
 354                 return error;
 355
 356         error = data->ops->get_report_features(data->client, data->pattern,
 357                                                &data->report_features,
 358                                                &data->report_len);
 359         if (error)
 360                 return error;
 361
 362         data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
 363
 364         error = elan_get_fwinfo(data->ic_type, data->iap_version,
 365                                 &data->fw_validpage_count,
 366                                 &data->fw_signature_address,
 367                                 &data->fw_page_size);
 368         if (error)
 369                 dev_warn(&data->client->dev,
 370                          "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
 371                          data->iap_version, data->ic_type);
 372
 373         return 0;
 374 }
 375
 376 static unsigned int elan_convert_resolution(u8 val, u8 pattern)
 377 {
 378         /*
 379          * pattern <= 0x01:
 380          *      (value from firmware) * 10 + 790 = dpi
 381          * else
 382          *      ((value from firmware) + 3) * 100 = dpi
 383          */
 384         int res = pattern <= 0x01 ?
 385                 (int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
 386         /*
 387          * We also have to convert dpi to dots/mm (*10/254 to avoid floating
 388          * point).
 389          */
 390         return res * 10 / 254;
 391 }
 392
 393 static int elan_query_device_parameters(struct elan_tp_data *data)
 394 {
 395         struct i2c_client *client = data->client;
 396         unsigned int x_traces, y_traces;
 397         u32 x_mm, y_mm;
 398         u8 hw_x_res, hw_y_res;
 399         int error;
 400
 401         if (device_property_read_u32(&client->dev,
 402                                      "touchscreen-size-x", &data->max_x) ||
 403             device_property_read_u32(&client->dev,
 404                                      "touchscreen-size-y", &data->max_y)) {
 405                 error = data->ops->get_max(data->client,
 406                                            &data->max_x,
 407                                            &data->max_y);
 408                 if (error)
 409                         return error;
 410         } else {
 411                 /* size is the maximum + 1 */
 412                 --data->max_x;
 413                 --data->max_y;
 414         }
 415
 416         if (device_property_read_u32(&client->dev,
 417                                      "elan,x_traces",
 418                                      &x_traces) ||
 419             device_property_read_u32(&client->dev,
 420                                      "elan,y_traces",
 421                                      &y_traces)) {
 422                 error = data->ops->get_num_traces(data->client,
 423                                                   &x_traces, &y_traces);
 424                 if (error)
 425                         return error;
 426         }
 427         data->width_x = data->max_x / x_traces;
 428         data->width_y = data->max_y / y_traces;
 429
 430         if (device_property_read_u32(&client->dev,
 431                                      "touchscreen-x-mm", &x_mm) ||
 432             device_property_read_u32(&client->dev,
 433                                      "touchscreen-y-mm", &y_mm)) {
 434                 error = data->ops->get_resolution(data->client,
 435                                                   &hw_x_res, &hw_y_res);
 436                 if (error)
 437                         return error;
 438
 439                 data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
 440                 data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
 441         } else {
 442                 data->x_res = (data->max_x + 1) / x_mm;
 443                 data->y_res = (data->max_y + 1) / y_mm;
 444         }
 445
 446         if (device_property_read_bool(&client->dev, "elan,clickpad"))
 447                 data->clickpad = 1;
 448
 449         if (device_property_read_bool(&client->dev, "elan,middle-button"))
 450                 data->middle_button = true;
 451
 452         return 0;
 453 }
 454
 455 /*
 456  **********************************************************
 457  * IAP firmware updater related routines
 458  **********************************************************
 459  */
 460 static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
 461                                const u8 *page, u16 checksum, int idx)
 462 {
 463         int retry = ETP_RETRY_COUNT;
 464         int error;
 465
 466         do {
 467                 error = data->ops->write_fw_block(data->client, page_size,
 468                                                   page, checksum, idx);
 469                 if (!error)
 470                         return 0;
 471
 472                 dev_dbg(&data->client->dev,
 473                         "IAP retrying page %d (error: %d)\n", idx, error);
 474         } while (--retry > 0);
 475
 476         return error;
 477 }
 478
 479 static int __elan_update_firmware(struct elan_tp_data *data,
 480                                   const struct firmware *fw)
 481 {
 482         struct i2c_client *client = data->client;
 483         struct device *dev = &client->dev;
 484         int i, j;
 485         int error;
 486         u16 iap_start_addr;
 487         u16 boot_page_count;
 488         u16 sw_checksum = 0, fw_checksum = 0;
 489
 490         error = data->ops->prepare_fw_update(client, data->ic_type,
 491                                              data->iap_version,
 492                                              data->fw_page_size);
 493         if (error)
 494                 return error;
 495
 496         iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
 497
 498         boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
 499         for (i = boot_page_count; i < data->fw_validpage_count; i++) {
 500                 u16 checksum = 0;
 501                 const u8 *page = &fw->data[i * data->fw_page_size];
 502
 503                 for (j = 0; j < data->fw_page_size; j += 2)
 504                         checksum += ((page[j + 1] << 8) | page[j]);
 505
 506                 error = elan_write_fw_block(data, data->fw_page_size,
 507                                             page, checksum, i);
 508                 if (error) {
 509                         dev_err(dev, "write page %d fail: %d\n", i, error);
 510                         return error;
 511                 }
 512
 513                 sw_checksum += checksum;
 514         }
 515
 516         /* Wait WDT reset and power on reset */
 517         msleep(600);
 518
 519         error = data->ops->finish_fw_update(client, &data->fw_completion);
 520         if (error)
 521                 return error;
 522
 523         error = data->ops->get_checksum(client, true, &fw_checksum);
 524         if (error)
 525                 return error;
 526
 527         if (sw_checksum != fw_checksum) {
 528                 dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
 529                         sw_checksum, fw_checksum);
 530                 return -EIO;
 531         }
 532
 533         return 0;
 534 }
 535
 536 static int elan_update_firmware(struct elan_tp_data *data,
 537                                 const struct firmware *fw)
 538 {
 539         struct i2c_client *client = data->client;
 540         int retval;
 541
 542         dev_dbg(&client->dev, "Starting firmware update....\n");
 543
 544         disable_irq(client->irq);
 545         data->in_fw_update = true;
 546
 547         retval = __elan_update_firmware(data, fw);
 548         if (retval) {
 549                 dev_err(&client->dev, "firmware update failed: %d\n", retval);
 550                 data->ops->iap_reset(client);
 551         } else {
 552                 /* Reinitialize TP after fw is updated */
 553                 elan_initialize(data, false);
 554                 elan_query_device_info(data);
 555         }
 556
 557         data->in_fw_update = false;
 558         enable_irq(client->irq);
 559
 560         return retval;
 561 }
 562
 563 /*
 564  *******************************************************************
 565  * SYSFS attributes
 566  *******************************************************************
 567  */
 568 static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
 569                                            struct device_attribute *attr,
 570                                            char *buf)
 571 {
 572         struct i2c_client *client = to_i2c_client(dev);
 573         struct elan_tp_data *data = i2c_get_clientdata(client);
 574
 575         return sprintf(buf, "0x%04x\n", data->fw_checksum);
 576 }
 577
 578 static ssize_t elan_sysfs_read_product_id(struct device *dev,
 579                                          struct device_attribute *attr,
 580                                          char *buf)
 581 {
 582         struct i2c_client *client = to_i2c_client(dev);
 583         struct elan_tp_data *data = i2c_get_clientdata(client);
 584
 585         return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
 586                        data->product_id);
 587 }
 588
 589 static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
 590                                       struct device_attribute *attr,
 591                                       char *buf)
 592 {
 593         struct i2c_client *client = to_i2c_client(dev);
 594         struct elan_tp_data *data = i2c_get_clientdata(client);
 595
 596         return sprintf(buf, "%d.0\n", data->fw_version);
 597 }
 598
 599 static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
 600                                       struct device_attribute *attr,
 601                                       char *buf)
 602 {
 603         struct i2c_client *client = to_i2c_client(dev);
 604         struct elan_tp_data *data = i2c_get_clientdata(client);
 605
 606         return sprintf(buf, "%d.0\n", data->sm_version);
 607 }
 608
 609 static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
 610                                        struct device_attribute *attr,
 611                                        char *buf)
 612 {
 613         struct i2c_client *client = to_i2c_client(dev);
 614         struct elan_tp_data *data = i2c_get_clientdata(client);
 615
 616         return sprintf(buf, "%d.0\n", data->iap_version);
 617 }
 618
 619 static ssize_t elan_sysfs_update_fw(struct device *dev,
 620                                     struct device_attribute *attr,
 621                                     const char *buf, size_t count)
 622 {
 623         struct elan_tp_data *data = dev_get_drvdata(dev);
 624         const struct firmware *fw;
 625         char *fw_name;
 626         int error;
 627         const u8 *fw_signature;
 628         static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
 629
 630         if (data->fw_validpage_count == 0)
 631                 return -EINVAL;
 632
 633         /* Look for a firmware with the product id appended. */
 634         fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
 635         if (!fw_name) {
 636                 dev_err(dev, "failed to allocate memory for firmware name\n");
 637                 return -ENOMEM;
 638         }
 639
 640         dev_info(dev, "requesting fw '%s'\n", fw_name);
 641         error = request_firmware(&fw, fw_name, dev);
 642         kfree(fw_name);
 643         if (error) {
 644                 dev_err(dev, "failed to request firmware: %d\n", error);
 645                 return error;
 646         }
 647
 648         /* Firmware file must match signature data */
 649         fw_signature = &fw->data[data->fw_signature_address];
 650         if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
 651                 dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
 652                         (int)sizeof(signature), signature,
 653                         (int)sizeof(signature), fw_signature);
 654                 error = -EBADF;
 655                 goto out_release_fw;
 656         }
 657
 658         error = mutex_lock_interruptible(&data->sysfs_mutex);
 659         if (error)
 660                 goto out_release_fw;
 661
 662         error = elan_update_firmware(data, fw);
 663
 664         mutex_unlock(&data->sysfs_mutex);
 665
 666 out_release_fw:
 667         release_firmware(fw);
 668         return error ?: count;
 669 }
 670
 671 static ssize_t calibrate_store(struct device *dev,
 672                                struct device_attribute *attr,
 673                                const char *buf, size_t count)
 674 {
 675         struct i2c_client *client = to_i2c_client(dev);
 676         struct elan_tp_data *data = i2c_get_clientdata(client);
 677         int tries = 20;
 678         int retval;
 679         int error;
 680         u8 val[ETP_CALIBRATE_MAX_LEN];
 681
 682         retval = mutex_lock_interruptible(&data->sysfs_mutex);
 683         if (retval)
 684                 return retval;
 685
 686         disable_irq(client->irq);
 687
 688         data->mode |= ETP_ENABLE_CALIBRATE;
 689         retval = data->ops->set_mode(client, data->mode);
 690         if (retval) {
 691                 dev_err(dev, "failed to enable calibration mode: %d\n",
 692                         retval);
 693                 goto out;
 694         }
 695
 696         retval = data->ops->calibrate(client);
 697         if (retval) {
 698                 dev_err(dev, "failed to start calibration: %d\n",
 699                         retval);
 700                 goto out_disable_calibrate;
 701         }
 702
 703         val[0] = 0xff;
 704         do {
 705                 /* Wait 250ms before checking if calibration has completed. */
 706                 msleep(250);
 707
 708                 retval = data->ops->calibrate_result(client, val);
 709                 if (retval)
 710                         dev_err(dev, "failed to check calibration result: %d\n",
 711                                 retval);
 712                 else if (val[0] == 0)
 713                         break; /* calibration done */
 714
 715         } while (--tries);
 716
 717         if (tries == 0) {
 718                 dev_err(dev, "failed to calibrate. Timeout.\n");
 719                 retval = -ETIMEDOUT;
 720         }
 721
 722 out_disable_calibrate:
 723         data->mode &= ~ETP_ENABLE_CALIBRATE;
 724         error = data->ops->set_mode(data->client, data->mode);
 725         if (error) {
 726                 dev_err(dev, "failed to disable calibration mode: %d\n",
 727                         error);
 728                 if (!retval)
 729                         retval = error;
 730         }
 731 out:
 732         enable_irq(client->irq);
 733         mutex_unlock(&data->sysfs_mutex);
 734         return retval ?: count;
 735 }
 736
 737 static ssize_t elan_sysfs_read_mode(struct device *dev,
 738                                     struct device_attribute *attr,
 739                                     char *buf)
 740 {
 741         struct i2c_client *client = to_i2c_client(dev);
 742         struct elan_tp_data *data = i2c_get_clientdata(client);
 743         int error;
 744         enum tp_mode mode;
 745
 746         error = mutex_lock_interruptible(&data->sysfs_mutex);
 747         if (error)
 748                 return error;
 749
 750         error = data->ops->iap_get_mode(data->client, &mode);
 751
 752         mutex_unlock(&data->sysfs_mutex);
 753
 754         if (error)
 755                 return error;
 756
 757         return sprintf(buf, "%d\n", (int)mode);
 758 }
 759
 760 static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
 761 static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
 762 static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
 763 static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
 764 static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
 765 static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
 766 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
 767
 768 static DEVICE_ATTR_WO(calibrate);
 769
 770 static struct attribute *elan_sysfs_entries[] = {
 771         &dev_attr_product_id.attr,
 772         &dev_attr_firmware_version.attr,
 773         &dev_attr_sample_version.attr,
 774         &dev_attr_iap_version.attr,
 775         &dev_attr_fw_checksum.attr,
 776         &dev_attr_calibrate.attr,
 777         &dev_attr_mode.attr,
 778         &dev_attr_update_fw.attr,
 779         NULL,
 780 };
 781
 782 static const struct attribute_group elan_sysfs_group = {
 783         .attrs = elan_sysfs_entries,
 784 };
 785
 786 static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
 787                              const char *buf, size_t count)
 788 {
 789         struct i2c_client *client = to_i2c_client(dev);
 790         struct elan_tp_data *data = i2c_get_clientdata(client);
 791         int error;
 792         int retval;
 793
 794         retval = mutex_lock_interruptible(&data->sysfs_mutex);
 795         if (retval)
 796                 return retval;
 797
 798         disable_irq(client->irq);
 799
 800         data->baseline_ready = false;
 801
 802         data->mode |= ETP_ENABLE_CALIBRATE;
 803         retval = data->ops->set_mode(data->client, data->mode);
 804         if (retval) {
 805                 dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
 806                         retval);
 807                 goto out;
 808         }
 809
 810         msleep(250);
 811
 812         retval = data->ops->get_baseline_data(data->client, true,
 813                                               &data->max_baseline);
 814         if (retval) {
 815                 dev_err(dev, "Failed to read max baseline form device: %d\n",
 816                         retval);
 817                 goto out_disable_calibrate;
 818         }
 819
 820         retval = data->ops->get_baseline_data(data->client, false,
 821                                               &data->min_baseline);
 822         if (retval) {
 823                 dev_err(dev, "Failed to read min baseline form device: %d\n",
 824                         retval);
 825                 goto out_disable_calibrate;
 826         }
 827
 828         data->baseline_ready = true;
 829
 830 out_disable_calibrate:
 831         data->mode &= ~ETP_ENABLE_CALIBRATE;
 832         error = data->ops->set_mode(data->client, data->mode);
 833         if (error) {
 834                 dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
 835                         error);
 836                 if (!retval)
 837                         retval = error;
 838         }
 839 out:
 840         enable_irq(client->irq);
 841         mutex_unlock(&data->sysfs_mutex);
 842         return retval ?: count;
 843 }
 844
 845 static ssize_t min_show(struct device *dev,
 846                         struct device_attribute *attr, char *buf)
 847 {
 848         struct i2c_client *client = to_i2c_client(dev);
 849         struct elan_tp_data *data = i2c_get_clientdata(client);
 850         int retval;
 851
 852         retval = mutex_lock_interruptible(&data->sysfs_mutex);
 853         if (retval)
 854                 return retval;
 855
 856         if (!data->baseline_ready) {
 857                 retval = -ENODATA;
 858                 goto out;
 859         }
 860
 861         retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
 862
 863 out:
 864         mutex_unlock(&data->sysfs_mutex);
 865         return retval;
 866 }
 867
 868 static ssize_t max_show(struct device *dev,
 869                         struct device_attribute *attr, char *buf)
 870 {
 871         struct i2c_client *client = to_i2c_client(dev);
 872         struct elan_tp_data *data = i2c_get_clientdata(client);
 873         int retval;
 874
 875         retval = mutex_lock_interruptible(&data->sysfs_mutex);
 876         if (retval)
 877                 return retval;
 878
 879         if (!data->baseline_ready) {
 880                 retval = -ENODATA;
 881                 goto out;
 882         }
 883
 884         retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
 885
 886 out:
 887         mutex_unlock(&data->sysfs_mutex);
 888         return retval;
 889 }
 890
 891
 892 static DEVICE_ATTR_WO(acquire);
 893 static DEVICE_ATTR_RO(min);
 894 static DEVICE_ATTR_RO(max);
 895
 896 static struct attribute *elan_baseline_sysfs_entries[] = {
 897         &dev_attr_acquire.attr,
 898         &dev_attr_min.attr,
 899         &dev_attr_max.attr,
 900         NULL,
 901 };
 902
 903 static const struct attribute_group elan_baseline_sysfs_group = {
 904         .name = "baseline",
 905         .attrs = elan_baseline_sysfs_entries,
 906 };
 907
 908 static const struct attribute_group *elan_sysfs_groups[] = {
 909         &elan_sysfs_group,
 910         &elan_baseline_sysfs_group,
 911         NULL
 912 };
 913
 914 /*
 915  ******************************************************************
 916  * Elan isr functions
 917  ******************************************************************
 918  */
 919 static void elan_report_contact(struct elan_tp_data *data, int contact_num,
 920                                 bool contact_valid, bool high_precision,
 921                                 u8 *packet, u8 *finger_data)
 922 {
 923         struct input_dev *input = data->input;
 924         unsigned int pos_x, pos_y;
 925         unsigned int pressure, scaled_pressure;
 926
 927         if (contact_valid) {
 928                 if (high_precision) {
 929                         pos_x = get_unaligned_be16(&finger_data[0]);
 930                         pos_y = get_unaligned_be16(&finger_data[2]);
 931                 } else {
 932                         pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
 933                         pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
 934                 }
 935
 936                 if (pos_x > data->max_x || pos_y > data->max_y) {
 937                         dev_dbg(input->dev.parent,
 938                                 "[%d] x=%d y=%d over max (%d, %d)",
 939                                 contact_num, pos_x, pos_y,
 940                                 data->max_x, data->max_y);
 941                         return;
 942                 }
 943
 944                 pressure = finger_data[4];
 945                 scaled_pressure = pressure + data->pressure_adjustment;
 946                 if (scaled_pressure > ETP_MAX_PRESSURE)
 947                         scaled_pressure = ETP_MAX_PRESSURE;
 948
 949                 input_mt_slot(input, contact_num);
 950                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 951                 input_report_abs(input, ABS_MT_POSITION_X, pos_x);
 952                 input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
 953                 input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
 954
 955                 if (data->report_features & ETP_FEATURE_REPORT_MK) {
 956                         unsigned int mk_x, mk_y, area_x, area_y;
 957                         u8 mk_data = high_precision ?
 958                                 packet[ETP_MK_DATA_OFFSET + contact_num] :
 959                                 finger_data[3];
 960
 961                         mk_x = mk_data & 0x0f;
 962                         mk_y = mk_data >> 4;
 963
 964                         /*
 965                          * To avoid treating large finger as palm, let's reduce
 966                          * the width x and y per trace.
 967                          */
 968                         area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
 969                         area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
 970
 971                         input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
 972                         input_report_abs(input, ABS_MT_TOUCH_MAJOR,
 973                                          max(area_x, area_y));
 974                         input_report_abs(input, ABS_MT_TOUCH_MINOR,
 975                                          min(area_x, area_y));
 976                 }
 977         } else {
 978                 input_mt_slot(input, contact_num);
 979                 input_mt_report_slot_inactive(input);
 980         }
 981 }
 982
 983 static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
 984                                  bool high_precision)
 985 {
 986         struct input_dev *input = data->input;
 987         u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
 988         int i;
 989         u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
 990         u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
 991         bool contact_valid, hover_event;
 992
 993         pm_wakeup_event(&data->client->dev, 0);
 994
 995         hover_event = hover_info & BIT(6);
 996
 997         for (i = 0; i < ETP_MAX_FINGERS; i++) {
 998                 contact_valid = tp_info & BIT(3 + i);
 999                 elan_report_contact(data, i, contact_valid, high_precision,
1000                                     packet, finger_data);
1001                 if (contact_valid)
1002                         finger_data += ETP_FINGER_DATA_LEN;
1003         }
1004
1005         input_report_key(input, BTN_LEFT,   tp_info & BIT(0));
1006         input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1007         input_report_key(input, BTN_RIGHT,  tp_info & BIT(1));
1008         input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1009         input_mt_report_pointer_emulation(input, true);
1010         input_sync(input);
1011 }
1012
1013 static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1014 {
1015         struct input_dev *input = data->tp_input;
1016         u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1017         int x, y;
1018
1019         pm_wakeup_event(&data->client->dev, 0);
1020
1021         if (!data->tp_input) {
1022                 dev_warn_once(&data->client->dev,
1023                               "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1024                 return;
1025         }
1026
1027         input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1028         input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1029         input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1030
1031         if ((packet[3] & 0x0F) == 0x06) {
1032                 x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1033                 y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1034
1035                 input_report_rel(input, REL_X, x);
1036                 input_report_rel(input, REL_Y, y);
1037         }
1038
1039         input_sync(input);
1040 }
1041
1042 static irqreturn_t elan_isr(int irq, void *dev_id)
1043 {
1044         struct elan_tp_data *data = dev_id;
1045         int error;
1046         u8 report[ETP_MAX_REPORT_LEN];
1047
1048         /*
1049          * When device is connected to i2c bus, when all IAP page writes
1050          * complete, the driver will receive interrupt and must read
1051          * 0000 to confirm that IAP is finished.
1052         */
1053         if (data->in_fw_update) {
1054                 complete(&data->fw_completion);
1055                 goto out;
1056         }
1057
1058         error = data->ops->get_report(data->client, report, data->report_len);
1059         if (error)
1060                 goto out;
1061
1062         switch (report[ETP_REPORT_ID_OFFSET]) {
1063         case ETP_REPORT_ID:
1064                 elan_report_absolute(data, report, false);
1065                 break;
1066         case ETP_REPORT_ID2:
1067                 elan_report_absolute(data, report, true);
1068                 break;
1069         case ETP_TP_REPORT_ID:
1070         case ETP_TP_REPORT_ID2:
1071                 elan_report_trackpoint(data, report);
1072                 break;
1073         default:
1074                 dev_err(&data->client->dev, "invalid report id data (%x)\n",
1075                         report[ETP_REPORT_ID_OFFSET]);
1076         }
1077
1078 out:
1079         return IRQ_HANDLED;
1080 }
1081
1082 /*
1083  ******************************************************************
1084  * Elan initialization functions
1085  ******************************************************************
1086  */
1087
1088 static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1089 {
1090         struct device *dev = &data->client->dev;
1091         struct input_dev *input;
1092
1093         input = devm_input_allocate_device(dev);
1094         if (!input)
1095                 return -ENOMEM;
1096
1097         input->name = "Elan TrackPoint";
1098         input->id.bustype = BUS_I2C;
1099         input->id.vendor = ELAN_VENDOR_ID;
1100         input->id.product = data->product_id;
1101         input_set_drvdata(input, data);
1102
1103         input_set_capability(input, EV_REL, REL_X);
1104         input_set_capability(input, EV_REL, REL_Y);
1105         input_set_capability(input, EV_KEY, BTN_LEFT);
1106         input_set_capability(input, EV_KEY, BTN_RIGHT);
1107         input_set_capability(input, EV_KEY, BTN_MIDDLE);
1108
1109         __set_bit(INPUT_PROP_POINTER, input->propbit);
1110         __set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1111
1112         data->tp_input = input;
1113
1114         return 0;
1115 }
1116
1117 static int elan_setup_input_device(struct elan_tp_data *data)
1118 {
1119         struct device *dev = &data->client->dev;
1120         struct input_dev *input;
1121         unsigned int max_width = max(data->width_x, data->width_y);
1122         unsigned int min_width = min(data->width_x, data->width_y);
1123         int error;
1124
1125         input = devm_input_allocate_device(dev);
1126         if (!input)
1127                 return -ENOMEM;
1128
1129         input->name = "Elan Touchpad";
1130         input->id.bustype = BUS_I2C;
1131         input->id.vendor = ELAN_VENDOR_ID;
1132         input->id.product = data->product_id;
1133         input_set_drvdata(input, data);
1134
1135         error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1136                                     INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1137         if (error) {
1138                 dev_err(dev, "failed to initialize MT slots: %d\n", error);
1139                 return error;
1140         }
1141
1142         __set_bit(EV_ABS, input->evbit);
1143         __set_bit(INPUT_PROP_POINTER, input->propbit);
1144         if (data->clickpad) {
1145                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1146         } else {
1147                 __set_bit(BTN_RIGHT, input->keybit);
1148                 if (data->middle_button)
1149                         __set_bit(BTN_MIDDLE, input->keybit);
1150         }
1151         __set_bit(BTN_LEFT, input->keybit);
1152
1153         /* Set up ST parameters */
1154         input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1155         input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1156         input_abs_set_res(input, ABS_X, data->x_res);
1157         input_abs_set_res(input, ABS_Y, data->y_res);
1158         input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1159         if (data->report_features & ETP_FEATURE_REPORT_MK)
1160                 input_set_abs_params(input, ABS_TOOL_WIDTH,
1161                                      0, ETP_FINGER_WIDTH, 0, 0);
1162         input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1163
1164         /* And MT parameters */
1165         input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1166         input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1167         input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1168         input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1169         input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1170                              ETP_MAX_PRESSURE, 0, 0);
1171         if (data->report_features & ETP_FEATURE_REPORT_MK) {
1172                 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1173                                      0, ETP_FINGER_WIDTH * max_width, 0, 0);
1174                 input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1175                                      0, ETP_FINGER_WIDTH * min_width, 0, 0);
1176         }
1177
1178         data->input = input;
1179
1180         return 0;
1181 }
1182
1183 static void elan_disable_regulator(void *_data)
1184 {
1185         struct elan_tp_data *data = _data;
1186
1187         regulator_disable(data->vcc);
1188 }
1189
1190 static int elan_probe(struct i2c_client *client)
1191 {
1192         const struct elan_transport_ops *transport_ops;
1193         struct device *dev = &client->dev;
1194         struct elan_tp_data *data;
1195         unsigned long irqflags;
1196         int error;
1197
1198         if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1199             i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1200                 transport_ops = &elan_i2c_ops;
1201         } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1202                    i2c_check_functionality(client->adapter,
1203                                            I2C_FUNC_SMBUS_BYTE_DATA |
1204                                                 I2C_FUNC_SMBUS_BLOCK_DATA |
1205                                                 I2C_FUNC_SMBUS_I2C_BLOCK)) {
1206                 transport_ops = &elan_smbus_ops;
1207         } else {
1208                 dev_err(dev, "not a supported I2C/SMBus adapter\n");
1209                 return -EIO;
1210         }
1211
1212         data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1213         if (!data)
1214                 return -ENOMEM;
1215
1216         i2c_set_clientdata(client, data);
1217
1218         data->ops = transport_ops;
1219         data->client = client;
1220         init_completion(&data->fw_completion);
1221         mutex_init(&data->sysfs_mutex);
1222
1223         data->vcc = devm_regulator_get(dev, "vcc");
1224         if (IS_ERR(data->vcc)) {
1225                 error = PTR_ERR(data->vcc);
1226                 if (error != -EPROBE_DEFER)
1227                         dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1228                                 error);
1229                 return error;
1230         }
1231
1232         error = regulator_enable(data->vcc);
1233         if (error) {
1234                 dev_err(dev, "Failed to enable regulator: %d\n", error);
1235                 return error;
1236         }
1237
1238         error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1239         if (error) {
1240                 dev_err(dev, "Failed to add disable regulator action: %d\n",
1241                         error);
1242                 return error;
1243         }
1244
1245         /* Make sure there is something at this address */
1246         error = i2c_smbus_read_byte(client);
1247         if (error < 0) {
1248                 dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1249                 return -ENXIO;
1250         }
1251
1252         /* Initialize the touchpad. */
1253         error = elan_initialize(data, false);
1254         if (error)
1255                 return error;
1256
1257         error = elan_query_device_info(data);
1258         if (error)
1259                 return error;
1260
1261         error = elan_query_device_parameters(data);
1262         if (error)
1263                 return error;
1264
1265         dev_info(dev,
1266                  "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1267                  data->product_id,
1268                  data->fw_version,
1269                  data->sm_version,
1270                  data->iap_version);
1271
1272         dev_dbg(dev,
1273                 "Elan Touchpad Extra Information:\n"
1274                 "    Max ABS X,Y:   %d,%d\n"
1275                 "    Width X,Y:   %d,%d\n"
1276                 "    Resolution X,Y:   %d,%d (dots/mm)\n"
1277                 "    ic type: 0x%x\n"
1278                 "    info pattern: 0x%x\n",
1279                 data->max_x, data->max_y,
1280                 data->width_x, data->width_y,
1281                 data->x_res, data->y_res,
1282                 data->ic_type, data->pattern);
1283
1284         /* Set up input device properties based on queried parameters. */
1285         error = elan_setup_input_device(data);
1286         if (error)
1287                 return error;
1288
1289         if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1290                 error = elan_setup_trackpoint_input_device(data);
1291                 if (error)
1292                         return error;
1293         }
1294
1295         /*
1296          * Platform code (ACPI, DTS) should normally set up interrupt
1297          * for us, but in case it did not let's fall back to using falling
1298          * edge to be compatible with older Chromebooks.
1299          */
1300         irqflags = irq_get_trigger_type(client->irq);
1301         if (!irqflags)
1302                 irqflags = IRQF_TRIGGER_FALLING;
1303
1304         error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1305                                           irqflags | IRQF_ONESHOT,
1306                                           client->name, data);
1307         if (error) {
1308                 dev_err(dev, "cannot register irq=%d\n", client->irq);
1309                 return error;
1310         }
1311
1312         error = input_register_device(data->input);
1313         if (error) {
1314                 dev_err(dev, "failed to register input device: %d\n", error);
1315                 return error;
1316         }
1317
1318         if (data->tp_input) {
1319                 error = input_register_device(data->tp_input);
1320                 if (error) {
1321                         dev_err(&client->dev,
1322                                 "failed to register TrackPoint input device: %d\n",
1323                                 error);
1324                         return error;
1325                 }
1326         }
1327
1328         return 0;
1329 }
1330
1331 static int __maybe_unused elan_suspend(struct device *dev)
1332 {
1333         struct i2c_client *client = to_i2c_client(dev);
1334         struct elan_tp_data *data = i2c_get_clientdata(client);
1335         int ret;
1336
1337         /*
1338          * We are taking the mutex to make sure sysfs operations are
1339          * complete before we attempt to bring the device into low[er]
1340          * power mode.
1341          */
1342         ret = mutex_lock_interruptible(&data->sysfs_mutex);
1343         if (ret)
1344                 return ret;
1345
1346         disable_irq(client->irq);
1347
1348         if (device_may_wakeup(dev)) {
1349                 ret = elan_sleep(data);
1350         } else {
1351                 ret = elan_set_power(data, false);
1352                 if (ret)
1353                         goto err;
1354
1355                 ret = regulator_disable(data->vcc);
1356                 if (ret) {
1357                         dev_err(dev, "error %d disabling regulator\n", ret);
1358                         /* Attempt to power the chip back up */
1359                         elan_set_power(data, true);
1360                 }
1361         }
1362
1363 err:
1364         mutex_unlock(&data->sysfs_mutex);
1365         return ret;
1366 }
1367
1368 static int __maybe_unused elan_resume(struct device *dev)
1369 {
1370         struct i2c_client *client = to_i2c_client(dev);
1371         struct elan_tp_data *data = i2c_get_clientdata(client);
1372         int error;
1373
1374         if (!device_may_wakeup(dev)) {
1375                 error = regulator_enable(data->vcc);
1376                 if (error) {
1377                         dev_err(dev, "error %d enabling regulator\n", error);
1378                         goto err;
1379                 }
1380         }
1381
1382         error = elan_set_power(data, true);
1383         if (error) {
1384                 dev_err(dev, "power up when resuming failed: %d\n", error);
1385                 goto err;
1386         }
1387
1388         error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1389         if (error)
1390                 dev_err(dev, "initialize when resuming failed: %d\n", error);
1391
1392 err:
1393         enable_irq(data->client->irq);
1394         return error;
1395 }
1396
1397 static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1398
1399 static const struct i2c_device_id elan_id[] = {
1400         { DRIVER_NAME, 0 },
1401         { },
1402 };
1403 MODULE_DEVICE_TABLE(i2c, elan_id);
1404
1405 #ifdef CONFIG_ACPI
1406 #include <linux/input/elan-i2c-ids.h>
1407 MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1408 #endif
1409
1410 #ifdef CONFIG_OF
1411 static const struct of_device_id elan_of_match[] = {
1412         { .compatible = "elan,ekth3000" },
1413         { /* sentinel */ }
1414 };
1415 MODULE_DEVICE_TABLE(of, elan_of_match);
1416 #endif
1417
1418 static struct i2c_driver elan_driver = {
1419         .driver = {
1420                 .name   = DRIVER_NAME,
1421                 .pm     = &elan_pm_ops,
1422                 .acpi_match_table = ACPI_PTR(elan_acpi_id),
1423                 .of_match_table = of_match_ptr(elan_of_match),
1424                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1425                 .dev_groups = elan_sysfs_groups,
1426         },
1427         .probe_new      = elan_probe,
1428         .id_table       = elan_id,
1429 };
1430
1431 module_i2c_driver(elan_driver);
1432
1433 MODULE_AUTHOR("Duson Lin <[email protected]>");
1434 MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1435 MODULE_LICENSE("GPL");