kernel/drivers/input/mouse/elan_i2c_i2c.c

   1 /*
   2  * Elan I2C/SMBus Touchpad driver - I2C interface
   3  *
   4  * Copyright (c) 2013 ELAN Microelectronics Corp.
   5  *
   6  * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
   7  *
   8  * Based on cyapa driver:
   9  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  10  * copyright (c) 2011-2012 Google, Inc.
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License version 2 as published
  14  * by the Free Software Foundation.
  15  *
  16  * Trademarks are the property of their respective owners.
  17  */
  18
  19 #include <linux/completion.h>
  20 #include <linux/delay.h>
  21 #include <linux/i2c.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/kernel.h>
  25 #include <linux/sched.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "elan_i2c.h"
  29
  30 /* Elan i2c commands */
  31 #define ETP_I2C_RESET                   0x0100
  32 #define ETP_I2C_WAKE_UP                 0x0800
  33 #define ETP_I2C_SLEEP                   0x0801
  34 #define ETP_I2C_DESC_CMD                0x0001
  35 #define ETP_I2C_REPORT_DESC_CMD         0x0002
  36 #define ETP_I2C_STAND_CMD               0x0005
  37 #define ETP_I2C_UNIQUEID_CMD            0x0101
  38 #define ETP_I2C_FW_VERSION_CMD          0x0102
  39 #define ETP_I2C_SM_VERSION_CMD          0x0103
  40 #define ETP_I2C_XY_TRACENUM_CMD         0x0105
  41 #define ETP_I2C_MAX_X_AXIS_CMD          0x0106
  42 #define ETP_I2C_MAX_Y_AXIS_CMD          0x0107
  43 #define ETP_I2C_RESOLUTION_CMD          0x0108
  44 #define ETP_I2C_PRESSURE_CMD            0x010A
  45 #define ETP_I2C_IAP_VERSION_CMD         0x0110
  46 #define ETP_I2C_SET_CMD                 0x0300
  47 #define ETP_I2C_POWER_CMD               0x0307
  48 #define ETP_I2C_FW_CHECKSUM_CMD         0x030F
  49 #define ETP_I2C_IAP_CTRL_CMD            0x0310
  50 #define ETP_I2C_IAP_CMD                 0x0311
  51 #define ETP_I2C_IAP_RESET_CMD           0x0314
  52 #define ETP_I2C_IAP_CHECKSUM_CMD        0x0315
  53 #define ETP_I2C_CALIBRATE_CMD           0x0316
  54 #define ETP_I2C_MAX_BASELINE_CMD        0x0317
  55 #define ETP_I2C_MIN_BASELINE_CMD        0x0318
  56
  57 #define ETP_I2C_REPORT_LEN              34
  58 #define ETP_I2C_DESC_LENGTH             30
  59 #define ETP_I2C_REPORT_DESC_LENGTH      158
  60 #define ETP_I2C_INF_LENGTH              2
  61 #define ETP_I2C_IAP_PASSWORD            0x1EA5
  62 #define ETP_I2C_IAP_RESET               0xF0F0
  63 #define ETP_I2C_MAIN_MODE_ON            (1 << 9)
  64 #define ETP_I2C_IAP_REG_L               0x01
  65 #define ETP_I2C_IAP_REG_H               0x06
  66
  67 static int elan_i2c_read_block(struct i2c_client *client,
  68                                u16 reg, u8 *val, u16 len)
  69 {
  70         __le16 buf[] = {
  71                 cpu_to_le16(reg),
  72         };
  73         struct i2c_msg msgs[] = {
  74                 {
  75                         .addr = client->addr,
  76                         .flags = client->flags & I2C_M_TEN,
  77                         .len = sizeof(buf),
  78                         .buf = (u8 *)buf,
  79                 },
  80                 {
  81                         .addr = client->addr,
  82                         .flags = (client->flags & I2C_M_TEN) | I2C_M_RD,
  83                         .len = len,
  84                         .buf = val,
  85                 }
  86         };
  87         int ret;
  88
  89         ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
  90         return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO);
  91 }
  92
  93 static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
  94 {
  95         int retval;
  96
  97         retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH);
  98         if (retval < 0) {
  99                 dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
 100                 return retval;
 101         }
 102
 103         return 0;
 104 }
 105
 106 static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
 107 {
 108         __le16 buf[] = {
 109                 cpu_to_le16(reg),
 110                 cpu_to_le16(cmd),
 111         };
 112         struct i2c_msg msg = {
 113                 .addr = client->addr,
 114                 .flags = client->flags & I2C_M_TEN,
 115                 .len = sizeof(buf),
 116                 .buf = (u8 *)buf,
 117         };
 118         int ret;
 119
 120         ret = i2c_transfer(client->adapter, &msg, 1);
 121         if (ret != 1) {
 122                 if (ret >= 0)
 123                         ret = -EIO;
 124                 dev_err(&client->dev, "writing cmd (0x%04x) failed: %d\n",
 125                         reg, ret);
 126                 return ret;
 127         }
 128
 129         return 0;
 130 }
 131
 132 static int elan_i2c_initialize(struct i2c_client *client)
 133 {
 134         struct device *dev = &client->dev;
 135         int error;
 136         u8 val[256];
 137
 138         error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
 139         if (error) {
 140                 dev_err(dev, "device reset failed: %d\n", error);
 141                 return error;
 142         }
 143
 144         /* Wait for the device to reset */
 145         msleep(100);
 146
 147         /* get reset acknowledgement 0000 */
 148         error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH);
 149         if (error < 0) {
 150                 dev_err(dev, "failed to read reset response: %d\n", error);
 151                 return error;
 152         }
 153
 154         error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD,
 155                                     val, ETP_I2C_DESC_LENGTH);
 156         if (error) {
 157                 dev_err(dev, "cannot get device descriptor: %d\n", error);
 158                 return error;
 159         }
 160
 161         error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
 162                                     val, ETP_I2C_REPORT_DESC_LENGTH);
 163         if (error) {
 164                 dev_err(dev, "fetching report descriptor failed.: %d\n", error);
 165                 return error;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep)
 172 {
 173         return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
 174                                   sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP);
 175 }
 176
 177 static int elan_i2c_power_control(struct i2c_client *client, bool enable)
 178 {
 179         u8 val[2];
 180         u16 reg;
 181         int error;
 182
 183         error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val);
 184         if (error) {
 185                 dev_err(&client->dev,
 186                         "failed to read current power state: %d\n",
 187                         error);
 188                 return error;
 189         }
 190
 191         reg = le16_to_cpup((__le16 *)val);
 192         if (enable)
 193                 reg &= ~ETP_DISABLE_POWER;
 194         else
 195                 reg |= ETP_DISABLE_POWER;
 196
 197         error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg);
 198         if (error) {
 199                 dev_err(&client->dev,
 200                         "failed to write current power state: %d\n",
 201                         error);
 202                 return error;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int elan_i2c_set_mode(struct i2c_client *client, u8 mode)
 209 {
 210         return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode);
 211 }
 212
 213
 214 static int elan_i2c_calibrate(struct i2c_client *client)
 215 {
 216         return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1);
 217 }
 218
 219 static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val)
 220 {
 221         return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1);
 222 }
 223
 224 static int elan_i2c_get_baseline_data(struct i2c_client *client,
 225                                       bool max_baseline, u8 *value)
 226 {
 227         int error;
 228         u8 val[3];
 229
 230         error = elan_i2c_read_cmd(client,
 231                                   max_baseline ? ETP_I2C_MAX_BASELINE_CMD :
 232                                                  ETP_I2C_MIN_BASELINE_CMD,
 233                                   val);
 234         if (error)
 235                 return error;
 236
 237         *value = le16_to_cpup((__le16 *)val);
 238
 239         return 0;
 240 }
 241
 242 static int elan_i2c_get_version(struct i2c_client *client,
 243                                 bool iap, u8 *version)
 244 {
 245         int error;
 246         u8 val[3];
 247
 248         error = elan_i2c_read_cmd(client,
 249                                   iap ? ETP_I2C_IAP_VERSION_CMD :
 250                                         ETP_I2C_FW_VERSION_CMD,
 251                                   val);
 252         if (error) {
 253                 dev_err(&client->dev, "failed to get %s version: %d\n",
 254                         iap ? "IAP" : "FW", error);
 255                 return error;
 256         }
 257
 258         *version = val[0];
 259         return 0;
 260 }
 261
 262 static int elan_i2c_get_sm_version(struct i2c_client *client, u8 *version)
 263 {
 264         int error;
 265         u8 val[3];
 266
 267         error = elan_i2c_read_cmd(client, ETP_I2C_SM_VERSION_CMD, val);
 268         if (error) {
 269                 dev_err(&client->dev, "failed to get SM version: %d\n", error);
 270                 return error;
 271         }
 272
 273         *version = val[0];
 274         return 0;
 275 }
 276
 277 static int elan_i2c_get_product_id(struct i2c_client *client, u8 *id)
 278 {
 279         int error;
 280         u8 val[3];
 281
 282         error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
 283         if (error) {
 284                 dev_err(&client->dev, "failed to get product ID: %d\n", error);
 285                 return error;
 286         }
 287
 288         *id = val[0];
 289         return 0;
 290 }
 291
 292 static int elan_i2c_get_checksum(struct i2c_client *client,
 293                                  bool iap, u16 *csum)
 294 {
 295         int error;
 296         u8 val[3];
 297
 298         error = elan_i2c_read_cmd(client,
 299                                   iap ? ETP_I2C_IAP_CHECKSUM_CMD :
 300                                         ETP_I2C_FW_CHECKSUM_CMD,
 301                                   val);
 302         if (error) {
 303                 dev_err(&client->dev, "failed to get %s checksum: %d\n",
 304                         iap ? "IAP" : "FW", error);
 305                 return error;
 306         }
 307
 308         *csum = le16_to_cpup((__le16 *)val);
 309         return 0;
 310 }
 311
 312 static int elan_i2c_get_max(struct i2c_client *client,
 313                             unsigned int *max_x, unsigned int *max_y)
 314 {
 315         int error;
 316         u8 val[3];
 317
 318         error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
 319         if (error) {
 320                 dev_err(&client->dev, "failed to get X dimension: %d\n", error);
 321                 return error;
 322         }
 323
 324         *max_x = le16_to_cpup((__le16 *)val) & 0x0fff;
 325
 326         error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
 327         if (error) {
 328                 dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
 329                 return error;
 330         }
 331
 332         *max_y = le16_to_cpup((__le16 *)val) & 0x0fff;
 333
 334         return 0;
 335 }
 336
 337 static int elan_i2c_get_resolution(struct i2c_client *client,
 338                                    u8 *hw_res_x, u8 *hw_res_y)
 339 {
 340         int error;
 341         u8 val[3];
 342
 343         error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
 344         if (error) {
 345                 dev_err(&client->dev, "failed to get resolution: %d\n", error);
 346                 return error;
 347         }
 348
 349         *hw_res_x = val[0];
 350         *hw_res_y = val[1];
 351
 352         return 0;
 353 }
 354
 355 static int elan_i2c_get_num_traces(struct i2c_client *client,
 356                                    unsigned int *x_traces,
 357                                    unsigned int *y_traces)
 358 {
 359         int error;
 360         u8 val[3];
 361
 362         error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
 363         if (error) {
 364                 dev_err(&client->dev, "failed to get trace info: %d\n", error);
 365                 return error;
 366         }
 367
 368         *x_traces = val[0];
 369         *y_traces = val[1];
 370
 371         return 0;
 372 }
 373
 374 static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
 375                                             int *adjustment)
 376 {
 377         int error;
 378         u8 val[3];
 379
 380         error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
 381         if (error) {
 382                 dev_err(&client->dev, "failed to get pressure format: %d\n",
 383                         error);
 384                 return error;
 385         }
 386
 387         if ((val[0] >> 4) & 0x1)
 388                 *adjustment = 0;
 389         else
 390                 *adjustment = ETP_PRESSURE_OFFSET;
 391
 392         return 0;
 393 }
 394
 395 static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
 396 {
 397         int error;
 398         u16 constant;
 399         u8 val[3];
 400
 401         error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
 402         if (error) {
 403                 dev_err(&client->dev,
 404                         "failed to read iap control register: %d\n",
 405                         error);
 406                 return error;
 407         }
 408
 409         constant = le16_to_cpup((__le16 *)val);
 410         dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
 411
 412         *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
 413
 414         return 0;
 415 }
 416
 417 static int elan_i2c_iap_reset(struct i2c_client *client)
 418 {
 419         int error;
 420
 421         error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
 422                                    ETP_I2C_IAP_RESET);
 423         if (error) {
 424                 dev_err(&client->dev, "cannot reset IC: %d\n", error);
 425                 return error;
 426         }
 427
 428         return 0;
 429 }
 430
 431 static int elan_i2c_set_flash_key(struct i2c_client *client)
 432 {
 433         int error;
 434
 435         error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
 436                                    ETP_I2C_IAP_PASSWORD);
 437         if (error) {
 438                 dev_err(&client->dev, "cannot set flash key: %d\n", error);
 439                 return error;
 440         }
 441
 442         return 0;
 443 }
 444
 445 static int elan_i2c_prepare_fw_update(struct i2c_client *client)
 446 {
 447         struct device *dev = &client->dev;
 448         int error;
 449         enum tp_mode mode;
 450         u8 val[3];
 451         u16 password;
 452
 453         /* Get FW in which mode (IAP_MODE/MAIN_MODE)  */
 454         error = elan_i2c_iap_get_mode(client, &mode);
 455         if (error)
 456                 return error;
 457
 458         if (mode == IAP_MODE) {
 459                 /* Reset IC */
 460                 error = elan_i2c_iap_reset(client);
 461                 if (error)
 462                         return error;
 463
 464                 msleep(30);
 465         }
 466
 467         /* Set flash key*/
 468         error = elan_i2c_set_flash_key(client);
 469         if (error)
 470                 return error;
 471
 472         /* Wait for F/W IAP initialization */
 473         msleep(mode == MAIN_MODE ? 100 : 30);
 474
 475         /* Check if we are in IAP mode or not */
 476         error = elan_i2c_iap_get_mode(client, &mode);
 477         if (error)
 478                 return error;
 479
 480         if (mode == MAIN_MODE) {
 481                 dev_err(dev, "wrong mode: %d\n", mode);
 482                 return -EIO;
 483         }
 484
 485         /* Set flash key again */
 486         error = elan_i2c_set_flash_key(client);
 487         if (error)
 488                 return error;
 489
 490         /* Wait for F/W IAP initialization */
 491         msleep(30);
 492
 493         /* read back to check we actually enabled successfully. */
 494         error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
 495         if (error) {
 496                 dev_err(dev, "cannot read iap password: %d\n",
 497                         error);
 498                 return error;
 499         }
 500
 501         password = le16_to_cpup((__le16 *)val);
 502         if (password != ETP_I2C_IAP_PASSWORD) {
 503                 dev_err(dev, "wrong iap password: 0x%X\n", password);
 504                 return -EIO;
 505         }
 506
 507         return 0;
 508 }
 509
 510 static int elan_i2c_write_fw_block(struct i2c_client *client,
 511                                    const u8 *page, u16 checksum, int idx)
 512 {
 513         struct device *dev = &client->dev;
 514         u8 page_store[ETP_FW_PAGE_SIZE + 4];
 515         u8 val[3];
 516         u16 result;
 517         int ret, error;
 518
 519         page_store[0] = ETP_I2C_IAP_REG_L;
 520         page_store[1] = ETP_I2C_IAP_REG_H;
 521         memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
 522         /* recode checksum at last two bytes */
 523         put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]);
 524
 525         ret = i2c_master_send(client, page_store, sizeof(page_store));
 526         if (ret != sizeof(page_store)) {
 527                 error = ret < 0 ? ret : -EIO;
 528                 dev_err(dev, "Failed to write page %d: %d\n", idx, error);
 529                 return error;
 530         }
 531
 532         /* Wait for F/W to update one page ROM data. */
 533         msleep(20);
 534
 535         error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
 536         if (error) {
 537                 dev_err(dev, "Failed to read IAP write result: %d\n", error);
 538                 return error;
 539         }
 540
 541         result = le16_to_cpup((__le16 *)val);
 542         if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
 543                 dev_err(dev, "IAP reports failed write: %04hx\n",
 544                         result);
 545                 return -EIO;
 546         }
 547
 548         return 0;
 549 }
 550
 551 static int elan_i2c_finish_fw_update(struct i2c_client *client,
 552                                      struct completion *completion)
 553 {
 554         struct device *dev = &client->dev;
 555         long ret;
 556         int error;
 557         int len;
 558         u8 buffer[ETP_I2C_INF_LENGTH];
 559
 560         reinit_completion(completion);
 561         enable_irq(client->irq);
 562
 563         error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
 564         if (!error)
 565                 ret = wait_for_completion_interruptible_timeout(completion,
 566                                                         msecs_to_jiffies(300));
 567         disable_irq(client->irq);
 568
 569         if (error) {
 570                 dev_err(dev, "device reset failed: %d\n", error);
 571                 return error;
 572         } else if (ret == 0) {
 573                 dev_err(dev, "timeout waiting for device reset\n");
 574                 return -ETIMEDOUT;
 575         } else if (ret < 0) {
 576                 error = ret;
 577                 dev_err(dev, "error waiting for device reset: %d\n", error);
 578                 return error;
 579         }
 580
 581         len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
 582         if (len != ETP_I2C_INF_LENGTH) {
 583                 error = len < 0 ? len : -EIO;
 584                 dev_err(dev, "failed to read INT signal: %d (%d)\n",
 585                         error, len);
 586                 return error;
 587         }
 588
 589         return 0;
 590 }
 591
 592 static int elan_i2c_get_report(struct i2c_client *client, u8 *report)
 593 {
 594         int len;
 595
 596         len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN);
 597         if (len < 0) {
 598                 dev_err(&client->dev, "failed to read report data: %d\n", len);
 599                 return len;
 600         }
 601
 602         if (len != ETP_I2C_REPORT_LEN) {
 603                 dev_err(&client->dev,
 604                         "wrong report length (%d vs %d expected)\n",
 605                         len, ETP_I2C_REPORT_LEN);
 606                 return -EIO;
 607         }
 608
 609         return 0;
 610 }
 611
 612 const struct elan_transport_ops elan_i2c_ops = {
 613         .initialize             = elan_i2c_initialize,
 614         .sleep_control          = elan_i2c_sleep_control,
 615         .power_control          = elan_i2c_power_control,
 616         .set_mode               = elan_i2c_set_mode,
 617
 618         .calibrate              = elan_i2c_calibrate,
 619         .calibrate_result       = elan_i2c_calibrate_result,
 620
 621         .get_baseline_data      = elan_i2c_get_baseline_data,
 622
 623         .get_version            = elan_i2c_get_version,
 624         .get_sm_version         = elan_i2c_get_sm_version,
 625         .get_product_id         = elan_i2c_get_product_id,
 626         .get_checksum           = elan_i2c_get_checksum,
 627         .get_pressure_adjustment = elan_i2c_get_pressure_adjustment,
 628
 629         .get_max                = elan_i2c_get_max,
 630         .get_resolution         = elan_i2c_get_resolution,
 631         .get_num_traces         = elan_i2c_get_num_traces,
 632
 633         .iap_get_mode           = elan_i2c_iap_get_mode,
 634         .iap_reset              = elan_i2c_iap_reset,
 635
 636         .prepare_fw_update      = elan_i2c_prepare_fw_update,
 637         .write_fw_block         = elan_i2c_write_fw_block,
 638         .finish_fw_update       = elan_i2c_finish_fw_update,
 639
 640         .get_report             = elan_i2c_get_report,
 641 };