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,
 263                                    u8 *ic_type, u8 *version)
 264 {
 265         int error;
 266         u8 val[3];
 267
 268         error = elan_i2c_read_cmd(client, ETP_I2C_SM_VERSION_CMD, val);
 269         if (error) {
 270                 dev_err(&client->dev, "failed to get SM version: %d\n", error);
 271                 return error;
 272         }
 273
 274         *version = val[0];
 275         *ic_type = val[1];
 276         return 0;
 277 }
 278
 279 static int elan_i2c_get_product_id(struct i2c_client *client, u16 *id)
 280 {
 281         int error;
 282         u8 val[3];
 283
 284         error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val);
 285         if (error) {
 286                 dev_err(&client->dev, "failed to get product ID: %d\n", error);
 287                 return error;
 288         }
 289
 290         *id = le16_to_cpup((__le16 *)val);
 291         return 0;
 292 }
 293
 294 static int elan_i2c_get_checksum(struct i2c_client *client,
 295                                  bool iap, u16 *csum)
 296 {
 297         int error;
 298         u8 val[3];
 299
 300         error = elan_i2c_read_cmd(client,
 301                                   iap ? ETP_I2C_IAP_CHECKSUM_CMD :
 302                                         ETP_I2C_FW_CHECKSUM_CMD,
 303                                   val);
 304         if (error) {
 305                 dev_err(&client->dev, "failed to get %s checksum: %d\n",
 306                         iap ? "IAP" : "FW", error);
 307                 return error;
 308         }
 309
 310         *csum = le16_to_cpup((__le16 *)val);
 311         return 0;
 312 }
 313
 314 static int elan_i2c_get_max(struct i2c_client *client,
 315                             unsigned int *max_x, unsigned int *max_y)
 316 {
 317         int error;
 318         u8 val[3];
 319
 320         error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val);
 321         if (error) {
 322                 dev_err(&client->dev, "failed to get X dimension: %d\n", error);
 323                 return error;
 324         }
 325
 326         *max_x = le16_to_cpup((__le16 *)val) & 0x0fff;
 327
 328         error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val);
 329         if (error) {
 330                 dev_err(&client->dev, "failed to get Y dimension: %d\n", error);
 331                 return error;
 332         }
 333
 334         *max_y = le16_to_cpup((__le16 *)val) & 0x0fff;
 335
 336         return 0;
 337 }
 338
 339 static int elan_i2c_get_resolution(struct i2c_client *client,
 340                                    u8 *hw_res_x, u8 *hw_res_y)
 341 {
 342         int error;
 343         u8 val[3];
 344
 345         error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val);
 346         if (error) {
 347                 dev_err(&client->dev, "failed to get resolution: %d\n", error);
 348                 return error;
 349         }
 350
 351         *hw_res_x = val[0];
 352         *hw_res_y = val[1];
 353
 354         return 0;
 355 }
 356
 357 static int elan_i2c_get_num_traces(struct i2c_client *client,
 358                                    unsigned int *x_traces,
 359                                    unsigned int *y_traces)
 360 {
 361         int error;
 362         u8 val[3];
 363
 364         error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val);
 365         if (error) {
 366                 dev_err(&client->dev, "failed to get trace info: %d\n", error);
 367                 return error;
 368         }
 369
 370         *x_traces = val[0];
 371         *y_traces = val[1];
 372
 373         return 0;
 374 }
 375
 376 static int elan_i2c_get_pressure_adjustment(struct i2c_client *client,
 377                                             int *adjustment)
 378 {
 379         int error;
 380         u8 val[3];
 381
 382         error = elan_i2c_read_cmd(client, ETP_I2C_PRESSURE_CMD, val);
 383         if (error) {
 384                 dev_err(&client->dev, "failed to get pressure format: %d\n",
 385                         error);
 386                 return error;
 387         }
 388
 389         if ((val[0] >> 4) & 0x1)
 390                 *adjustment = 0;
 391         else
 392                 *adjustment = ETP_PRESSURE_OFFSET;
 393
 394         return 0;
 395 }
 396
 397 static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode)
 398 {
 399         int error;
 400         u16 constant;
 401         u8 val[3];
 402
 403         error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
 404         if (error) {
 405                 dev_err(&client->dev,
 406                         "failed to read iap control register: %d\n",
 407                         error);
 408                 return error;
 409         }
 410
 411         constant = le16_to_cpup((__le16 *)val);
 412         dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
 413
 414         *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE;
 415
 416         return 0;
 417 }
 418
 419 static int elan_i2c_iap_reset(struct i2c_client *client)
 420 {
 421         int error;
 422
 423         error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
 424                                    ETP_I2C_IAP_RESET);
 425         if (error) {
 426                 dev_err(&client->dev, "cannot reset IC: %d\n", error);
 427                 return error;
 428         }
 429
 430         return 0;
 431 }
 432
 433 static int elan_i2c_set_flash_key(struct i2c_client *client)
 434 {
 435         int error;
 436
 437         error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
 438                                    ETP_I2C_IAP_PASSWORD);
 439         if (error) {
 440                 dev_err(&client->dev, "cannot set flash key: %d\n", error);
 441                 return error;
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int elan_i2c_prepare_fw_update(struct i2c_client *client)
 448 {
 449         struct device *dev = &client->dev;
 450         int error;
 451         enum tp_mode mode;
 452         u8 val[3];
 453         u16 password;
 454
 455         /* Get FW in which mode (IAP_MODE/MAIN_MODE)  */
 456         error = elan_i2c_iap_get_mode(client, &mode);
 457         if (error)
 458                 return error;
 459
 460         if (mode == IAP_MODE) {
 461                 /* Reset IC */
 462                 error = elan_i2c_iap_reset(client);
 463                 if (error)
 464                         return error;
 465
 466                 msleep(30);
 467         }
 468
 469         /* Set flash key*/
 470         error = elan_i2c_set_flash_key(client);
 471         if (error)
 472                 return error;
 473
 474         /* Wait for F/W IAP initialization */
 475         msleep(mode == MAIN_MODE ? 100 : 30);
 476
 477         /* Check if we are in IAP mode or not */
 478         error = elan_i2c_iap_get_mode(client, &mode);
 479         if (error)
 480                 return error;
 481
 482         if (mode == MAIN_MODE) {
 483                 dev_err(dev, "wrong mode: %d\n", mode);
 484                 return -EIO;
 485         }
 486
 487         /* Set flash key again */
 488         error = elan_i2c_set_flash_key(client);
 489         if (error)
 490                 return error;
 491
 492         /* Wait for F/W IAP initialization */
 493         msleep(30);
 494
 495         /* read back to check we actually enabled successfully. */
 496         error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val);
 497         if (error) {
 498                 dev_err(dev, "cannot read iap password: %d\n",
 499                         error);
 500                 return error;
 501         }
 502
 503         password = le16_to_cpup((__le16 *)val);
 504         if (password != ETP_I2C_IAP_PASSWORD) {
 505                 dev_err(dev, "wrong iap password: 0x%X\n", password);
 506                 return -EIO;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int elan_i2c_write_fw_block(struct i2c_client *client,
 513                                    const u8 *page, u16 checksum, int idx)
 514 {
 515         struct device *dev = &client->dev;
 516         u8 page_store[ETP_FW_PAGE_SIZE + 4];
 517         u8 val[3];
 518         u16 result;
 519         int ret, error;
 520
 521         page_store[0] = ETP_I2C_IAP_REG_L;
 522         page_store[1] = ETP_I2C_IAP_REG_H;
 523         memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
 524         /* recode checksum at last two bytes */
 525         put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]);
 526
 527         ret = i2c_master_send(client, page_store, sizeof(page_store));
 528         if (ret != sizeof(page_store)) {
 529                 error = ret < 0 ? ret : -EIO;
 530                 dev_err(dev, "Failed to write page %d: %d\n", idx, error);
 531                 return error;
 532         }
 533
 534         /* Wait for F/W to update one page ROM data. */
 535         msleep(20);
 536
 537         error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
 538         if (error) {
 539                 dev_err(dev, "Failed to read IAP write result: %d\n", error);
 540                 return error;
 541         }
 542
 543         result = le16_to_cpup((__le16 *)val);
 544         if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
 545                 dev_err(dev, "IAP reports failed write: %04hx\n",
 546                         result);
 547                 return -EIO;
 548         }
 549
 550         return 0;
 551 }
 552
 553 static int elan_i2c_finish_fw_update(struct i2c_client *client,
 554                                      struct completion *completion)
 555 {
 556         struct device *dev = &client->dev;
 557         long ret;
 558         int error;
 559         int len;
 560         u8 buffer[ETP_I2C_INF_LENGTH];
 561
 562         reinit_completion(completion);
 563         enable_irq(client->irq);
 564
 565         error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET);
 566         if (!error)
 567                 ret = wait_for_completion_interruptible_timeout(completion,
 568                                                         msecs_to_jiffies(300));
 569         disable_irq(client->irq);
 570
 571         if (error) {
 572                 dev_err(dev, "device reset failed: %d\n", error);
 573                 return error;
 574         } else if (ret == 0) {
 575                 dev_err(dev, "timeout waiting for device reset\n");
 576                 return -ETIMEDOUT;
 577         } else if (ret < 0) {
 578                 error = ret;
 579                 dev_err(dev, "error waiting for device reset: %d\n", error);
 580                 return error;
 581         }
 582
 583         len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH);
 584         if (len != ETP_I2C_INF_LENGTH) {
 585                 error = len < 0 ? len : -EIO;
 586                 dev_err(dev, "failed to read INT signal: %d (%d)\n",
 587                         error, len);
 588                 return error;
 589         }
 590
 591         return 0;
 592 }
 593
 594 static int elan_i2c_get_report(struct i2c_client *client, u8 *report)
 595 {
 596         int len;
 597
 598         len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN);
 599         if (len < 0) {
 600                 dev_err(&client->dev, "failed to read report data: %d\n", len);
 601                 return len;
 602         }
 603
 604         if (len != ETP_I2C_REPORT_LEN) {
 605                 dev_err(&client->dev,
 606                         "wrong report length (%d vs %d expected)\n",
 607                         len, ETP_I2C_REPORT_LEN);
 608                 return -EIO;
 609         }
 610
 611         return 0;
 612 }
 613
 614 const struct elan_transport_ops elan_i2c_ops = {
 615         .initialize             = elan_i2c_initialize,
 616         .sleep_control          = elan_i2c_sleep_control,
 617         .power_control          = elan_i2c_power_control,
 618         .set_mode               = elan_i2c_set_mode,
 619
 620         .calibrate              = elan_i2c_calibrate,
 621         .calibrate_result       = elan_i2c_calibrate_result,
 622
 623         .get_baseline_data      = elan_i2c_get_baseline_data,
 624
 625         .get_version            = elan_i2c_get_version,
 626         .get_sm_version         = elan_i2c_get_sm_version,
 627         .get_product_id         = elan_i2c_get_product_id,
 628         .get_checksum           = elan_i2c_get_checksum,
 629         .get_pressure_adjustment = elan_i2c_get_pressure_adjustment,
 630
 631         .get_max                = elan_i2c_get_max,
 632         .get_resolution         = elan_i2c_get_resolution,
 633         .get_num_traces         = elan_i2c_get_num_traces,
 634
 635         .iap_get_mode           = elan_i2c_iap_get_mode,
 636         .iap_reset              = elan_i2c_iap_reset,
 637
 638         .prepare_fw_update      = elan_i2c_prepare_fw_update,
 639         .write_fw_block         = elan_i2c_write_fw_block,
 640         .finish_fw_update       = elan_i2c_finish_fw_update,
 641
 642         .get_report             = elan_i2c_get_report,
 643 };