drivers/input/mouse/elan_i2c_smbus.c

   1 /*
   2  * Elan I2C/SMBus Touchpad driver - SMBus 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/delay.h>
  20 #include <linux/i2c.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23
  24 #include "elan_i2c.h"
  25
  26 /* Elan SMbus commands */
  27 #define ETP_SMBUS_IAP_CMD               0x00
  28 #define ETP_SMBUS_ENABLE_TP             0x20
  29 #define ETP_SMBUS_SLEEP_CMD             0x21
  30 #define ETP_SMBUS_IAP_PASSWORD_WRITE    0x29
  31 #define ETP_SMBUS_IAP_PASSWORD_READ     0x80
  32 #define ETP_SMBUS_WRITE_FW_BLOCK        0x2A
  33 #define ETP_SMBUS_IAP_RESET_CMD         0x2B
  34 #define ETP_SMBUS_RANGE_CMD             0xA0
  35 #define ETP_SMBUS_FW_VERSION_CMD        0xA1
  36 #define ETP_SMBUS_XY_TRACENUM_CMD       0xA2
  37 #define ETP_SMBUS_SM_VERSION_CMD        0xA3
  38 #define ETP_SMBUS_UNIQUEID_CMD          0xA3
  39 #define ETP_SMBUS_RESOLUTION_CMD        0xA4
  40 #define ETP_SMBUS_HELLOPACKET_CMD       0xA7
  41 #define ETP_SMBUS_PACKET_QUERY          0xA8
  42 #define ETP_SMBUS_IAP_VERSION_CMD       0xAC
  43 #define ETP_SMBUS_IAP_CTRL_CMD          0xAD
  44 #define ETP_SMBUS_IAP_CHECKSUM_CMD      0xAE
  45 #define ETP_SMBUS_FW_CHECKSUM_CMD       0xAF
  46 #define ETP_SMBUS_MAX_BASELINE_CMD      0xC3
  47 #define ETP_SMBUS_MIN_BASELINE_CMD      0xC4
  48 #define ETP_SMBUS_CALIBRATE_QUERY       0xC5
  49
  50 #define ETP_SMBUS_REPORT_LEN            32
  51 #define ETP_SMBUS_REPORT_OFFSET         2
  52 #define ETP_SMBUS_HELLOPACKET_LEN       5
  53 #define ETP_SMBUS_IAP_PASSWORD          0x1234
  54 #define ETP_SMBUS_IAP_MODE_ON           (1 << 6)
  55
  56 static int elan_smbus_initialize(struct i2c_client *client)
  57 {
  58         u8 check[ETP_SMBUS_HELLOPACKET_LEN] = { 0x55, 0x55, 0x55, 0x55, 0x55 };
  59         u8 values[ETP_SMBUS_HELLOPACKET_LEN] = { 0, 0, 0, 0, 0 };
  60         int len, error;
  61
  62         /* Get hello packet */
  63         len = i2c_smbus_read_block_data(client,
  64                                         ETP_SMBUS_HELLOPACKET_CMD, values);
  65         if (len != ETP_SMBUS_HELLOPACKET_LEN) {
  66                 dev_err(&client->dev, "hello packet length fail: %d\n", len);
  67                 error = len < 0 ? len : -EIO;
  68                 return error;
  69         }
  70
  71         /* compare hello packet */
  72         if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
  73                 dev_err(&client->dev, "hello packet fail [%*ph]\n",
  74                         ETP_SMBUS_HELLOPACKET_LEN, values);
  75                 return -ENXIO;
  76         }
  77
  78         /* enable tp */
  79         error = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
  80         if (error) {
  81                 dev_err(&client->dev, "failed to enable touchpad: %d\n", error);
  82                 return error;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static int elan_smbus_set_mode(struct i2c_client *client, u8 mode)
  89 {
  90         u8 cmd[4] = { 0x00, 0x07, 0x00, mode };
  91
  92         return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
  93                                           sizeof(cmd), cmd);
  94 }
  95
  96 static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep)
  97 {
  98         if (sleep)
  99                 return i2c_smbus_write_byte(client, ETP_SMBUS_SLEEP_CMD);
 100         else
 101                 return 0; /* XXX should we send ETP_SMBUS_ENABLE_TP here? */
 102 }
 103
 104 static int elan_smbus_power_control(struct i2c_client *client, bool enable)
 105 {
 106         return 0; /* A no-op */
 107 }
 108
 109 static int elan_smbus_calibrate(struct i2c_client *client)
 110 {
 111         u8 cmd[4] = { 0x00, 0x08, 0x00, 0x01 };
 112
 113         return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
 114                                           sizeof(cmd), cmd);
 115 }
 116
 117 static int elan_smbus_calibrate_result(struct i2c_client *client, u8 *val)
 118 {
 119         int error;
 120
 121         error = i2c_smbus_read_block_data(client,
 122                                           ETP_SMBUS_CALIBRATE_QUERY, val);
 123         if (error < 0)
 124                 return error;
 125
 126         return 0;
 127 }
 128
 129 static int elan_smbus_get_baseline_data(struct i2c_client *client,
 130                                         bool max_baseline, u8 *value)
 131 {
 132         int error;
 133         u8 val[3];
 134
 135         error = i2c_smbus_read_block_data(client,
 136                                           max_baseline ?
 137                                                 ETP_SMBUS_MAX_BASELINE_CMD :
 138                                                 ETP_SMBUS_MIN_BASELINE_CMD,
 139                                           val);
 140         if (error < 0)
 141                 return error;
 142
 143         *value = be16_to_cpup((__be16 *)val);
 144
 145         return 0;
 146 }
 147
 148 static int elan_smbus_get_version(struct i2c_client *client,
 149                                   bool iap, u8 *version)
 150 {
 151         int error;
 152         u8 val[3];
 153
 154         error = i2c_smbus_read_block_data(client,
 155                                           iap ? ETP_SMBUS_IAP_VERSION_CMD :
 156                                                 ETP_SMBUS_FW_VERSION_CMD,
 157                                           val);
 158         if (error < 0) {
 159                 dev_err(&client->dev, "failed to get %s version: %d\n",
 160                         iap ? "IAP" : "FW", error);
 161                 return error;
 162         }
 163
 164         *version = val[2];
 165         return 0;
 166 }
 167
 168 static int elan_smbus_get_sm_version(struct i2c_client *client,
 169                                      u8 *ic_type, u8 *version)
 170 {
 171         int error;
 172         u8 val[3];
 173
 174         error = i2c_smbus_read_block_data(client,
 175                                           ETP_SMBUS_SM_VERSION_CMD, val);
 176         if (error < 0) {
 177                 dev_err(&client->dev, "failed to get SM version: %d\n", error);
 178                 return error;
 179         }
 180
 181         *version = val[0];
 182         *ic_type = val[1];
 183         return 0;
 184 }
 185
 186 static int elan_smbus_get_product_id(struct i2c_client *client, u16 *id)
 187 {
 188         int error;
 189         u8 val[3];
 190
 191         error = i2c_smbus_read_block_data(client,
 192                                           ETP_SMBUS_UNIQUEID_CMD, val);
 193         if (error < 0) {
 194                 dev_err(&client->dev, "failed to get product ID: %d\n", error);
 195                 return error;
 196         }
 197
 198         *id = be16_to_cpup((__be16 *)val);
 199         return 0;
 200 }
 201
 202 static int elan_smbus_get_checksum(struct i2c_client *client,
 203                                    bool iap, u16 *csum)
 204 {
 205         int error;
 206         u8 val[3];
 207
 208         error = i2c_smbus_read_block_data(client,
 209                                           iap ? ETP_SMBUS_FW_CHECKSUM_CMD :
 210                                                 ETP_SMBUS_IAP_CHECKSUM_CMD,
 211                                           val);
 212         if (error < 0) {
 213                 dev_err(&client->dev, "failed to get %s checksum: %d\n",
 214                         iap ? "IAP" : "FW", error);
 215                 return error;
 216         }
 217
 218         *csum = be16_to_cpup((__be16 *)val);
 219         return 0;
 220 }
 221
 222 static int elan_smbus_get_max(struct i2c_client *client,
 223                               unsigned int *max_x, unsigned int *max_y)
 224 {
 225         int ret;
 226         int error;
 227         u8 val[3];
 228
 229         ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
 230         if (ret != 3) {
 231                 error = ret < 0 ? ret : -EIO;
 232                 dev_err(&client->dev, "failed to get dimensions: %d\n", error);
 233                 return error;
 234         }
 235
 236         *max_x = (0x0f & val[0]) << 8 | val[1];
 237         *max_y = (0xf0 & val[0]) << 4 | val[2];
 238
 239         return 0;
 240 }
 241
 242 static int elan_smbus_get_resolution(struct i2c_client *client,
 243                                      u8 *hw_res_x, u8 *hw_res_y)
 244 {
 245         int ret;
 246         int error;
 247         u8 val[3];
 248
 249         ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RESOLUTION_CMD, val);
 250         if (ret != 3) {
 251                 error = ret < 0 ? ret : -EIO;
 252                 dev_err(&client->dev, "failed to get resolution: %d\n", error);
 253                 return error;
 254         }
 255
 256         *hw_res_x = val[1] & 0x0F;
 257         *hw_res_y = (val[1] & 0xF0) >> 4;
 258
 259         return 0;
 260 }
 261
 262 static int elan_smbus_get_num_traces(struct i2c_client *client,
 263                                      unsigned int *x_traces,
 264                                      unsigned int *y_traces)
 265 {
 266         int ret;
 267         int error;
 268         u8 val[3];
 269
 270         ret = i2c_smbus_read_block_data(client, ETP_SMBUS_XY_TRACENUM_CMD, val);
 271         if (ret != 3) {
 272                 error = ret < 0 ? ret : -EIO;
 273                 dev_err(&client->dev, "failed to get trace info: %d\n", error);
 274                 return error;
 275         }
 276
 277         *x_traces = val[1];
 278         *y_traces = val[2];
 279
 280         return 0;
 281 }
 282
 283 static int elan_smbus_get_pressure_adjustment(struct i2c_client *client,
 284                                               int *adjustment)
 285 {
 286         *adjustment = ETP_PRESSURE_OFFSET;
 287         return 0;
 288 }
 289
 290 static int elan_smbus_iap_get_mode(struct i2c_client *client,
 291                                    enum tp_mode *mode)
 292 {
 293         int error;
 294         u16 constant;
 295         u8 val[3];
 296
 297         error = i2c_smbus_read_block_data(client, ETP_SMBUS_IAP_CTRL_CMD, val);
 298         if (error < 0) {
 299                 dev_err(&client->dev, "failed to read iap ctrol register: %d\n",
 300                         error);
 301                 return error;
 302         }
 303
 304         constant = be16_to_cpup((__be16 *)val);
 305         dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
 306
 307         *mode = (constant & ETP_SMBUS_IAP_MODE_ON) ? IAP_MODE : MAIN_MODE;
 308
 309         return 0;
 310 }
 311
 312 static int elan_smbus_iap_reset(struct i2c_client *client)
 313 {
 314         int error;
 315
 316         error = i2c_smbus_write_byte(client, ETP_SMBUS_IAP_RESET_CMD);
 317         if (error) {
 318                 dev_err(&client->dev, "cannot reset IC: %d\n", error);
 319                 return error;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static int elan_smbus_set_flash_key(struct i2c_client *client)
 326 {
 327         int error;
 328         u8 cmd[4] = { 0x00, 0x0B, 0x00, 0x5A };
 329
 330         error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
 331                                            sizeof(cmd), cmd);
 332         if (error) {
 333                 dev_err(&client->dev, "cannot set flash key: %d\n", error);
 334                 return error;
 335         }
 336
 337         return 0;
 338 }
 339
 340 static int elan_smbus_prepare_fw_update(struct i2c_client *client)
 341 {
 342         struct device *dev = &client->dev;
 343         int len;
 344         int error;
 345         enum tp_mode mode;
 346         u8 val[3];
 347         u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06};
 348         u16 password;
 349
 350         /* Get FW in which mode (IAP_MODE/MAIN_MODE)  */
 351         error = elan_smbus_iap_get_mode(client, &mode);
 352         if (error)
 353                 return error;
 354
 355         if (mode == MAIN_MODE) {
 356
 357                 /* set flash key */
 358                 error = elan_smbus_set_flash_key(client);
 359                 if (error)
 360                         return error;
 361
 362                 /* write iap password */
 363                 if (i2c_smbus_write_byte(client,
 364                                          ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) {
 365                         dev_err(dev, "cannot write iap password\n");
 366                         return -EIO;
 367                 }
 368
 369                 error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
 370                                                    sizeof(cmd), cmd);
 371                 if (error) {
 372                         dev_err(dev, "failed to write iap password: %d\n",
 373                                 error);
 374                         return error;
 375                 }
 376
 377                 /*
 378                  * Read back password to make sure we enabled flash
 379                  * successfully.
 380                  */
 381                 len = i2c_smbus_read_block_data(client,
 382                                                 ETP_SMBUS_IAP_PASSWORD_READ,
 383                                                 val);
 384                 if (len < sizeof(u16)) {
 385                         error = len < 0 ? len : -EIO;
 386                         dev_err(dev, "failed to read iap password: %d\n",
 387                                 error);
 388                         return error;
 389                 }
 390
 391                 password = be16_to_cpup((__be16 *)val);
 392                 if (password != ETP_SMBUS_IAP_PASSWORD) {
 393                         dev_err(dev, "wrong iap password = 0x%X\n", password);
 394                         return -EIO;
 395                 }
 396
 397                 /* Wait 30ms for MAIN_MODE change to IAP_MODE */
 398                 msleep(30);
 399         }
 400
 401         error = elan_smbus_set_flash_key(client);
 402         if (error)
 403                 return error;
 404
 405         /* Reset IC */
 406         error = elan_smbus_iap_reset(client);
 407         if (error)
 408                 return error;
 409
 410         return 0;
 411 }
 412
 413
 414 static int elan_smbus_write_fw_block(struct i2c_client *client,
 415                                      const u8 *page, u16 checksum, int idx)
 416 {
 417         struct device *dev = &client->dev;
 418         int error;
 419         u16 result;
 420         u8 val[3];
 421
 422         /*
 423          * Due to the limitation of smbus protocol limiting
 424          * transfer to 32 bytes at a time, we must split block
 425          * in 2 transfers.
 426          */
 427         error = i2c_smbus_write_block_data(client,
 428                                            ETP_SMBUS_WRITE_FW_BLOCK,
 429                                            ETP_FW_PAGE_SIZE / 2,
 430                                            page);
 431         if (error) {
 432                 dev_err(dev, "Failed to write page %d (part %d): %d\n",
 433                         idx, 1, error);
 434                 return error;
 435         }
 436
 437         error = i2c_smbus_write_block_data(client,
 438                                            ETP_SMBUS_WRITE_FW_BLOCK,
 439                                            ETP_FW_PAGE_SIZE / 2,
 440                                            page + ETP_FW_PAGE_SIZE / 2);
 441         if (error) {
 442                 dev_err(dev, "Failed to write page %d (part %d): %d\n",
 443                         idx, 2, error);
 444                 return error;
 445         }
 446
 447
 448         /* Wait for F/W to update one page ROM data. */
 449         usleep_range(8000, 10000);
 450
 451         error = i2c_smbus_read_block_data(client,
 452                                           ETP_SMBUS_IAP_CTRL_CMD, val);
 453         if (error < 0) {
 454                 dev_err(dev, "Failed to read IAP write result: %d\n",
 455                         error);
 456                 return error;
 457         }
 458
 459         result = be16_to_cpup((__be16 *)val);
 460         if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
 461                 dev_err(dev, "IAP reports failed write: %04hx\n",
 462                         result);
 463                 return -EIO;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static int elan_smbus_get_report(struct i2c_client *client, u8 *report)
 470 {
 471         int len;
 472
 473         len = i2c_smbus_read_block_data(client,
 474                                         ETP_SMBUS_PACKET_QUERY,
 475                                         &report[ETP_SMBUS_REPORT_OFFSET]);
 476         if (len < 0) {
 477                 dev_err(&client->dev, "failed to read report data: %d\n", len);
 478                 return len;
 479         }
 480
 481         if (len != ETP_SMBUS_REPORT_LEN) {
 482                 dev_err(&client->dev,
 483                         "wrong report length (%d vs %d expected)\n",
 484                         len, ETP_SMBUS_REPORT_LEN);
 485                 return -EIO;
 486         }
 487
 488         return 0;
 489 }
 490
 491 static int elan_smbus_finish_fw_update(struct i2c_client *client,
 492                                        struct completion *fw_completion)
 493 {
 494         /* No special handling unlike I2C transport */
 495         return 0;
 496 }
 497
 498 const struct elan_transport_ops elan_smbus_ops = {
 499         .initialize             = elan_smbus_initialize,
 500         .sleep_control          = elan_smbus_sleep_control,
 501         .power_control          = elan_smbus_power_control,
 502         .set_mode               = elan_smbus_set_mode,
 503
 504         .calibrate              = elan_smbus_calibrate,
 505         .calibrate_result       = elan_smbus_calibrate_result,
 506
 507         .get_baseline_data      = elan_smbus_get_baseline_data,
 508
 509         .get_version            = elan_smbus_get_version,
 510         .get_sm_version         = elan_smbus_get_sm_version,
 511         .get_product_id         = elan_smbus_get_product_id,
 512         .get_checksum           = elan_smbus_get_checksum,
 513         .get_pressure_adjustment = elan_smbus_get_pressure_adjustment,
 514
 515         .get_max                = elan_smbus_get_max,
 516         .get_resolution         = elan_smbus_get_resolution,
 517         .get_num_traces         = elan_smbus_get_num_traces,
 518
 519         .iap_get_mode           = elan_smbus_iap_get_mode,
 520         .iap_reset              = elan_smbus_iap_reset,
 521
 522         .prepare_fw_update      = elan_smbus_prepare_fw_update,
 523         .write_fw_block         = elan_smbus_write_fw_block,
 524         .finish_fw_update       = elan_smbus_finish_fw_update,
 525
 526         .get_report             = elan_smbus_get_report,
 527 };